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             (struct thread *)NULL
2107             );
2108         if (stcb == NULL) {
2109                 struct mbuf *op_err;
2110
2111                 /* memory problem? */
2112                 SCTPDBG(SCTP_DEBUG_INPUT1,
2113                     "process_cookie_new: no room for another TCB!\n");
2114                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2115                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2116                     src, dst, sh, op_err,
2117                     mflowtype, mflowid,
2118                     vrf_id, port);
2119                 return (NULL);
2120         }
2121         /* get the correct sctp_nets */
2122         if (netp)
2123                 *netp = sctp_findnet(stcb, init_src);
2124
2125         asoc = &stcb->asoc;
2126         /* get scope variables out of cookie */
2127         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2128         asoc->scope.site_scope = cookie->site_scope;
2129         asoc->scope.local_scope = cookie->local_scope;
2130         asoc->scope.loopback_scope = cookie->loopback_scope;
2131
2132         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2133             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2134                 struct mbuf *op_err;
2135
2136                 /*
2137                  * Houston we have a problem. The EP changed while the
2138                  * cookie was in flight. Only recourse is to abort the
2139                  * association.
2140                  */
2141                 atomic_add_int(&stcb->asoc.refcnt, 1);
2142                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2143                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2144                     src, dst, sh, op_err,
2145                     mflowtype, mflowid,
2146                     vrf_id, port);
2147 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2148                 SCTP_TCB_UNLOCK(stcb);
2149                 SCTP_SOCKET_LOCK(so, 1);
2150                 SCTP_TCB_LOCK(stcb);
2151 #endif
2152                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2153                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2154 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2155                 SCTP_SOCKET_UNLOCK(so, 1);
2156 #endif
2157                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2158                 return (NULL);
2159         }
2160         /* process the INIT-ACK info (my info) */
2161         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2162         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2163         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2164         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2165         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2166         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2167         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2168         asoc->str_reset_seq_in = asoc->init_seq_number;
2169
2170         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2171
2172         /* process the INIT info (peer's info) */
2173         if (netp)
2174                 retval = sctp_process_init(init_cp, stcb);
2175         else
2176                 retval = 0;
2177         if (retval < 0) {
2178                 atomic_add_int(&stcb->asoc.refcnt, 1);
2179 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2180                 SCTP_TCB_UNLOCK(stcb);
2181                 SCTP_SOCKET_LOCK(so, 1);
2182                 SCTP_TCB_LOCK(stcb);
2183 #endif
2184                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2185                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2186 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2187                 SCTP_SOCKET_UNLOCK(so, 1);
2188 #endif
2189                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2190                 return (NULL);
2191         }
2192         /* load all addresses */
2193         if (sctp_load_addresses_from_init(stcb, m,
2194             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2195             src, dst, init_src)) {
2196                 atomic_add_int(&stcb->asoc.refcnt, 1);
2197 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2198                 SCTP_TCB_UNLOCK(stcb);
2199                 SCTP_SOCKET_LOCK(so, 1);
2200                 SCTP_TCB_LOCK(stcb);
2201 #endif
2202                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2203                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2204 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2205                 SCTP_SOCKET_UNLOCK(so, 1);
2206 #endif
2207                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2208                 return (NULL);
2209         }
2210         /*
2211          * verify any preceding AUTH chunk that was skipped
2212          */
2213         /* pull the local authentication parameters from the cookie/init-ack */
2214         sctp_auth_get_cookie_params(stcb, m,
2215             initack_offset + sizeof(struct sctp_init_ack_chunk),
2216             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2217         if (auth_skipped) {
2218                 struct sctp_auth_chunk *auth;
2219
2220                 auth = (struct sctp_auth_chunk *)
2221                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2222                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2223                         /* auth HMAC failed, dump the assoc and packet */
2224                         SCTPDBG(SCTP_DEBUG_AUTH1,
2225                             "COOKIE-ECHO: AUTH failed\n");
2226                         atomic_add_int(&stcb->asoc.refcnt, 1);
2227 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2228                         SCTP_TCB_UNLOCK(stcb);
2229                         SCTP_SOCKET_LOCK(so, 1);
2230                         SCTP_TCB_LOCK(stcb);
2231 #endif
2232                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2233                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2234 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2235                         SCTP_SOCKET_UNLOCK(so, 1);
2236 #endif
2237                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2238                         return (NULL);
2239                 } else {
2240                         /* remaining chunks checked... good to go */
2241                         stcb->asoc.authenticated = 1;
2242                 }
2243         }
2244         /* update current state */
2245         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2246         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2247         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2248                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2249                     stcb->sctp_ep, stcb, asoc->primary_destination);
2250         }
2251         sctp_stop_all_cookie_timers(stcb);
2252         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2253         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2254
2255         /*
2256          * if we're doing ASCONFs, check to see if we have any new local
2257          * addresses that need to get added to the peer (eg. addresses
2258          * changed while cookie echo in flight).  This needs to be done
2259          * after we go to the OPEN state to do the correct asconf
2260          * processing. else, make sure we have the correct addresses in our
2261          * lists
2262          */
2263
2264         /* warning, we re-use sin, sin6, sa_store here! */
2265         /* pull in local_address (our "from" address) */
2266         switch (cookie->laddr_type) {
2267 #ifdef INET
2268         case SCTP_IPV4_ADDRESS:
2269                 /* source addr is IPv4 */
2270                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2271                 store.sin.sin_family = AF_INET;
2272                 store.sin.sin_len = sizeof(struct sockaddr_in);
2273                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2274                 break;
2275 #endif
2276 #ifdef INET6
2277         case SCTP_IPV6_ADDRESS:
2278                 /* source addr is IPv6 */
2279                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2280                 store.sin6.sin6_family = AF_INET6;
2281                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2282                 store.sin6.sin6_scope_id = cookie->scope_id;
2283                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2284                 break;
2285 #endif
2286         default:
2287                 atomic_add_int(&stcb->asoc.refcnt, 1);
2288 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2289                 SCTP_TCB_UNLOCK(stcb);
2290                 SCTP_SOCKET_LOCK(so, 1);
2291                 SCTP_TCB_LOCK(stcb);
2292 #endif
2293                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2294                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2295 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2296                 SCTP_SOCKET_UNLOCK(so, 1);
2297 #endif
2298                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2299                 return (NULL);
2300         }
2301
2302         /* set up to notify upper layer */
2303         *notification = SCTP_NOTIFY_ASSOC_UP;
2304         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2305             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2306             (inp->sctp_socket->so_qlimit == 0)) {
2307                 /*
2308                  * This is an endpoint that called connect() how it got a
2309                  * cookie that is NEW is a bit of a mystery. It must be that
2310                  * the INIT was sent, but before it got there.. a complete
2311                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2312                  * should have went to the other code.. not here.. oh well..
2313                  * a bit of protection is worth having..
2314                  */
2315                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2316 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2317                 atomic_add_int(&stcb->asoc.refcnt, 1);
2318                 SCTP_TCB_UNLOCK(stcb);
2319                 SCTP_SOCKET_LOCK(so, 1);
2320                 SCTP_TCB_LOCK(stcb);
2321                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2322                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2323                         SCTP_SOCKET_UNLOCK(so, 1);
2324                         return (NULL);
2325                 }
2326 #endif
2327                 soisconnected(stcb->sctp_socket);
2328 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2329                 SCTP_SOCKET_UNLOCK(so, 1);
2330 #endif
2331         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2332             (inp->sctp_socket->so_qlimit)) {
2333                 /*
2334                  * We don't want to do anything with this one. Since it is
2335                  * the listening guy. The timer will get started for
2336                  * accepted connections in the caller.
2337                  */
2338                 ;
2339         }
2340         /* since we did not send a HB make sure we don't double things */
2341         if ((netp) && (*netp))
2342                 (*netp)->hb_responded = 1;
2343
2344         if (stcb->asoc.sctp_autoclose_ticks &&
2345             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2346                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2347         }
2348         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2349         if ((netp != NULL) && (*netp != NULL)) {
2350                 /* calculate the RTT and set the encaps port */
2351                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2352                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2353                     SCTP_RTT_FROM_NON_DATA);
2354 #if defined(INET) || defined(INET6)
2355                 if (((*netp)->port == 0) && (port != 0)) {
2356                         sctp_pathmtu_adjustment(stcb, (*netp)->mtu - sizeof(struct udphdr));
2357                 }
2358                 (*netp)->port = port;
2359 #endif
2360         }
2361         /* respond with a COOKIE-ACK */
2362         sctp_send_cookie_ack(stcb);
2363
2364         /*
2365          * check the address lists for any ASCONFs that need to be sent
2366          * AFTER the cookie-ack is sent
2367          */
2368         sctp_check_address_list(stcb, m,
2369             initack_offset + sizeof(struct sctp_init_ack_chunk),
2370             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2371             &store.sa, cookie->local_scope, cookie->site_scope,
2372             cookie->ipv4_scope, cookie->loopback_scope);
2373
2374
2375         return (stcb);
2376 }
2377
2378 /*
2379  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2380  * we NEED to make sure we are not already using the vtag. If so we
2381  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2382         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2383                                                             SCTP_BASE_INFO(hashasocmark))];
2384         LIST_FOREACH(stcb, head, sctp_asocs) {
2385                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2386                        -- SEND ABORT - TRY AGAIN --
2387                 }
2388         }
2389 */
2390
2391 /*
2392  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2393  * existing (non-NULL) TCB
2394  */
2395 static struct mbuf *
2396 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2397     struct sockaddr *src, struct sockaddr *dst,
2398     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2399     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2400     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2401     struct sctp_tcb **locked_tcb,
2402     uint8_t mflowtype, uint32_t mflowid,
2403     uint32_t vrf_id, uint16_t port)
2404 {
2405         struct sctp_state_cookie *cookie;
2406         struct sctp_tcb *l_stcb = *stcb;
2407         struct sctp_inpcb *l_inp;
2408         struct sockaddr *to;
2409         struct sctp_pcb *ep;
2410         struct mbuf *m_sig;
2411         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2412         uint8_t *sig;
2413         uint8_t cookie_ok = 0;
2414         unsigned int sig_offset, cookie_offset;
2415         unsigned int cookie_len;
2416         struct timeval now;
2417         struct timeval time_expires;
2418         int notification = 0;
2419         struct sctp_nets *netl;
2420         int had_a_existing_tcb = 0;
2421         int send_int_conf = 0;
2422
2423 #ifdef INET
2424         struct sockaddr_in sin;
2425
2426 #endif
2427 #ifdef INET6
2428         struct sockaddr_in6 sin6;
2429
2430 #endif
2431
2432         SCTPDBG(SCTP_DEBUG_INPUT2,
2433             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2434
2435         if (inp_p == NULL) {
2436                 return (NULL);
2437         }
2438         cookie = &cp->cookie;
2439         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2440         cookie_len = ntohs(cp->ch.chunk_length);
2441
2442         if ((cookie->peerport != sh->src_port) ||
2443             (cookie->myport != sh->dest_port) ||
2444             (cookie->my_vtag != sh->v_tag)) {
2445                 /*
2446                  * invalid ports or bad tag.  Note that we always leave the
2447                  * v_tag in the header in network order and when we stored
2448                  * it in the my_vtag slot we also left it in network order.
2449                  * This maintains the match even though it may be in the
2450                  * opposite byte order of the machine :->
2451                  */
2452                 return (NULL);
2453         }
2454         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2455             sizeof(struct sctp_init_chunk) +
2456             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2457                 /* cookie too small */
2458                 return (NULL);
2459         }
2460         /*
2461          * split off the signature into its own mbuf (since it should not be
2462          * calculated in the sctp_hmac_m() call).
2463          */
2464         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2465         m_sig = m_split(m, sig_offset, M_NOWAIT);
2466         if (m_sig == NULL) {
2467                 /* out of memory or ?? */
2468                 return (NULL);
2469         }
2470 #ifdef SCTP_MBUF_LOGGING
2471         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2472                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2473         }
2474 #endif
2475
2476         /*
2477          * compute the signature/digest for the cookie
2478          */
2479         ep = &(*inp_p)->sctp_ep;
2480         l_inp = *inp_p;
2481         if (l_stcb) {
2482                 SCTP_TCB_UNLOCK(l_stcb);
2483         }
2484         SCTP_INP_RLOCK(l_inp);
2485         if (l_stcb) {
2486                 SCTP_TCB_LOCK(l_stcb);
2487         }
2488         /* which cookie is it? */
2489         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2490             (ep->current_secret_number != ep->last_secret_number)) {
2491                 /* it's the old cookie */
2492                 (void)sctp_hmac_m(SCTP_HMAC,
2493                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2494                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2495         } else {
2496                 /* it's the current cookie */
2497                 (void)sctp_hmac_m(SCTP_HMAC,
2498                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2499                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2500         }
2501         /* get the signature */
2502         SCTP_INP_RUNLOCK(l_inp);
2503         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2504         if (sig == NULL) {
2505                 /* couldn't find signature */
2506                 sctp_m_freem(m_sig);
2507                 return (NULL);
2508         }
2509         /* compare the received digest with the computed digest */
2510         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2511                 /* try the old cookie? */
2512                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2513                     (ep->current_secret_number != ep->last_secret_number)) {
2514                         /* compute digest with old */
2515                         (void)sctp_hmac_m(SCTP_HMAC,
2516                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2517                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2518                         /* compare */
2519                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2520                                 cookie_ok = 1;
2521                 }
2522         } else {
2523                 cookie_ok = 1;
2524         }
2525
2526         /*
2527          * Now before we continue we must reconstruct our mbuf so that
2528          * normal processing of any other chunks will work.
2529          */
2530         {
2531                 struct mbuf *m_at;
2532
2533                 m_at = m;
2534                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2535                         m_at = SCTP_BUF_NEXT(m_at);
2536                 }
2537                 SCTP_BUF_NEXT(m_at) = m_sig;
2538         }
2539
2540         if (cookie_ok == 0) {
2541                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2542                 SCTPDBG(SCTP_DEBUG_INPUT2,
2543                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2544                     (uint32_t) offset, cookie_offset, sig_offset);
2545                 return (NULL);
2546         }
2547         /*
2548          * check the cookie timestamps to be sure it's not stale
2549          */
2550         (void)SCTP_GETTIME_TIMEVAL(&now);
2551         /* Expire time is in Ticks, so we convert to seconds */
2552         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2553         time_expires.tv_usec = cookie->time_entered.tv_usec;
2554         /*
2555          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2556          * is undefined.
2557          */
2558         if (timevalcmp(&now, &time_expires, >)) {
2559                 /* cookie is stale! */
2560                 struct mbuf *op_err;
2561                 struct sctp_error_stale_cookie *cause;
2562                 uint32_t tim;
2563
2564                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2565                     0, M_NOWAIT, 1, MT_DATA);
2566                 if (op_err == NULL) {
2567                         /* FOOBAR */
2568                         return (NULL);
2569                 }
2570                 /* Set the len */
2571                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2572                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2573                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2574                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2575                     (sizeof(uint32_t))));
2576                 /* seconds to usec */
2577                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2578                 /* add in usec */
2579                 if (tim == 0)
2580                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2581                 cause->stale_time = htonl(tim);
2582                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2583                     mflowtype, mflowid, l_inp->fibnum,
2584                     vrf_id, port);
2585                 return (NULL);
2586         }
2587         /*
2588          * Now we must see with the lookup address if we have an existing
2589          * asoc. This will only happen if we were in the COOKIE-WAIT state
2590          * and a INIT collided with us and somewhere the peer sent the
2591          * cookie on another address besides the single address our assoc
2592          * had for him. In this case we will have one of the tie-tags set at
2593          * least AND the address field in the cookie can be used to look it
2594          * up.
2595          */
2596         to = NULL;
2597         switch (cookie->addr_type) {
2598 #ifdef INET6
2599         case SCTP_IPV6_ADDRESS:
2600                 memset(&sin6, 0, sizeof(sin6));
2601                 sin6.sin6_family = AF_INET6;
2602                 sin6.sin6_len = sizeof(sin6);
2603                 sin6.sin6_port = sh->src_port;
2604                 sin6.sin6_scope_id = cookie->scope_id;
2605                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2606                     sizeof(sin6.sin6_addr.s6_addr));
2607                 to = (struct sockaddr *)&sin6;
2608                 break;
2609 #endif
2610 #ifdef INET
2611         case SCTP_IPV4_ADDRESS:
2612                 memset(&sin, 0, sizeof(sin));
2613                 sin.sin_family = AF_INET;
2614                 sin.sin_len = sizeof(sin);
2615                 sin.sin_port = sh->src_port;
2616                 sin.sin_addr.s_addr = cookie->address[0];
2617                 to = (struct sockaddr *)&sin;
2618                 break;
2619 #endif
2620         default:
2621                 /* This should not happen */
2622                 return (NULL);
2623         }
2624         if (*stcb == NULL) {
2625                 /* Yep, lets check */
2626                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2627                 if (*stcb == NULL) {
2628                         /*
2629                          * We should have only got back the same inp. If we
2630                          * got back a different ep we have a problem. The
2631                          * original findep got back l_inp and now
2632                          */
2633                         if (l_inp != *inp_p) {
2634                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2635                         }
2636                 } else {
2637                         if (*locked_tcb == NULL) {
2638                                 /*
2639                                  * In this case we found the assoc only
2640                                  * after we locked the create lock. This
2641                                  * means we are in a colliding case and we
2642                                  * must make sure that we unlock the tcb if
2643                                  * its one of the cases where we throw away
2644                                  * the incoming packets.
2645                                  */
2646                                 *locked_tcb = *stcb;
2647
2648                                 /*
2649                                  * We must also increment the inp ref count
2650                                  * since the ref_count flags was set when we
2651                                  * did not find the TCB, now we found it
2652                                  * which reduces the refcount.. we must
2653                                  * raise it back out to balance it all :-)
2654                                  */
2655                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2656                                 if ((*stcb)->sctp_ep != l_inp) {
2657                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2658                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2659                                 }
2660                         }
2661                 }
2662         }
2663         cookie_len -= SCTP_SIGNATURE_SIZE;
2664         if (*stcb == NULL) {
2665                 /* this is the "normal" case... get a new TCB */
2666                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2667                     cookie, cookie_len, *inp_p,
2668                     netp, to, &notification,
2669                     auth_skipped, auth_offset, auth_len,
2670                     mflowtype, mflowid,
2671                     vrf_id, port);
2672         } else {
2673                 /* this is abnormal... cookie-echo on existing TCB */
2674                 had_a_existing_tcb = 1;
2675                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2676                     src, dst, sh,
2677                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2678                     &notification, auth_skipped, auth_offset, auth_len,
2679                     mflowtype, mflowid,
2680                     vrf_id, port);
2681         }
2682
2683         if (*stcb == NULL) {
2684                 /* still no TCB... must be bad cookie-echo */
2685                 return (NULL);
2686         }
2687         if (*netp != NULL) {
2688                 (*netp)->flowtype = mflowtype;
2689                 (*netp)->flowid = mflowid;
2690         }
2691         /*
2692          * Ok, we built an association so confirm the address we sent the
2693          * INIT-ACK to.
2694          */
2695         netl = sctp_findnet(*stcb, to);
2696         /*
2697          * This code should in theory NOT run but
2698          */
2699         if (netl == NULL) {
2700                 /* TSNH! Huh, why do I need to add this address here? */
2701                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2702                         return (NULL);
2703                 }
2704                 netl = sctp_findnet(*stcb, to);
2705         }
2706         if (netl) {
2707                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2708                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2709                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2710                             netl);
2711                         send_int_conf = 1;
2712                 }
2713         }
2714         sctp_start_net_timers(*stcb);
2715         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2716                 if (!had_a_existing_tcb ||
2717                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2718                         /*
2719                          * If we have a NEW cookie or the connect never
2720                          * reached the connected state during collision we
2721                          * must do the TCP accept thing.
2722                          */
2723                         struct socket *so, *oso;
2724                         struct sctp_inpcb *inp;
2725
2726                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2727                                 /*
2728                                  * For a restart we will keep the same
2729                                  * socket, no need to do anything. I THINK!!
2730                                  */
2731                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2732                                 if (send_int_conf) {
2733                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2734                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2735                                 }
2736                                 return (m);
2737                         }
2738                         oso = (*inp_p)->sctp_socket;
2739                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2740                         SCTP_TCB_UNLOCK((*stcb));
2741                         CURVNET_SET(oso->so_vnet);
2742                         so = sonewconn(oso, 0
2743                             );
2744                         CURVNET_RESTORE();
2745                         SCTP_TCB_LOCK((*stcb));
2746                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2747
2748                         if (so == NULL) {
2749                                 struct mbuf *op_err;
2750
2751 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2752                                 struct socket *pcb_so;
2753
2754 #endif
2755                                 /* Too many sockets */
2756                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2757                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2758                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2759                                     src, dst, sh, op_err,
2760                                     mflowtype, mflowid,
2761                                     vrf_id, port);
2762 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2763                                 pcb_so = SCTP_INP_SO(*inp_p);
2764                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2765                                 SCTP_TCB_UNLOCK((*stcb));
2766                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2767                                 SCTP_TCB_LOCK((*stcb));
2768                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2769 #endif
2770                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2771                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2772 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2773                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2774 #endif
2775                                 return (NULL);
2776                         }
2777                         inp = (struct sctp_inpcb *)so->so_pcb;
2778                         SCTP_INP_INCR_REF(inp);
2779                         /*
2780                          * We add the unbound flag here so that if we get an
2781                          * soabort() before we get the move_pcb done, we
2782                          * will properly cleanup.
2783                          */
2784                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2785                             SCTP_PCB_FLAGS_CONNECTED |
2786                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2787                             SCTP_PCB_FLAGS_UNBOUND |
2788                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2789                             SCTP_PCB_FLAGS_DONT_WAKE);
2790                         inp->sctp_features = (*inp_p)->sctp_features;
2791                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2792                         inp->sctp_socket = so;
2793                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2794                         inp->max_cwnd = (*inp_p)->max_cwnd;
2795                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2796                         inp->ecn_supported = (*inp_p)->ecn_supported;
2797                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2798                         inp->auth_supported = (*inp_p)->auth_supported;
2799                         inp->asconf_supported = (*inp_p)->asconf_supported;
2800                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2801                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2802                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2803                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2804                         inp->sctp_context = (*inp_p)->sctp_context;
2805                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2806                         inp->fibnum = (*inp_p)->fibnum;
2807                         inp->inp_starting_point_for_iterator = NULL;
2808                         /*
2809                          * copy in the authentication parameters from the
2810                          * original endpoint
2811                          */
2812                         if (inp->sctp_ep.local_hmacs)
2813                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2814                         inp->sctp_ep.local_hmacs =
2815                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2816                         if (inp->sctp_ep.local_auth_chunks)
2817                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2818                         inp->sctp_ep.local_auth_chunks =
2819                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2820
2821                         /*
2822                          * Now we must move it from one hash table to
2823                          * another and get the tcb in the right place.
2824                          */
2825
2826                         /*
2827                          * This is where the one-2-one socket is put into
2828                          * the accept state waiting for the accept!
2829                          */
2830                         if (*stcb) {
2831                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2832                         }
2833                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2834
2835                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2836                         SCTP_TCB_UNLOCK((*stcb));
2837
2838                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2839                             0);
2840                         SCTP_TCB_LOCK((*stcb));
2841                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2842
2843
2844                         /*
2845                          * now we must check to see if we were aborted while
2846                          * the move was going on and the lock/unlock
2847                          * happened.
2848                          */
2849                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2850                                 /*
2851                                  * yep it was, we leave the assoc attached
2852                                  * to the socket since the sctp_inpcb_free()
2853                                  * call will send an abort for us.
2854                                  */
2855                                 SCTP_INP_DECR_REF(inp);
2856                                 return (NULL);
2857                         }
2858                         SCTP_INP_DECR_REF(inp);
2859                         /* Switch over to the new guy */
2860                         *inp_p = inp;
2861                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2862                         if (send_int_conf) {
2863                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2864                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2865                         }
2866                         /*
2867                          * Pull it from the incomplete queue and wake the
2868                          * guy
2869                          */
2870 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2871                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2872                         SCTP_TCB_UNLOCK((*stcb));
2873                         SCTP_SOCKET_LOCK(so, 1);
2874 #endif
2875                         soisconnected(so);
2876 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2877                         SCTP_TCB_LOCK((*stcb));
2878                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2879                         SCTP_SOCKET_UNLOCK(so, 1);
2880 #endif
2881                         return (m);
2882                 }
2883         }
2884         if (notification) {
2885                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2886         }
2887         if (send_int_conf) {
2888                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2889                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2890         }
2891         return (m);
2892 }
2893
2894 static void
2895 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2896     struct sctp_tcb *stcb, struct sctp_nets *net)
2897 {
2898         /* cp must not be used, others call this without a c-ack :-) */
2899         struct sctp_association *asoc;
2900
2901         SCTPDBG(SCTP_DEBUG_INPUT2,
2902             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2903         if ((stcb == NULL) || (net == NULL)) {
2904                 return;
2905         }
2906         asoc = &stcb->asoc;
2907
2908         sctp_stop_all_cookie_timers(stcb);
2909         /* process according to association state */
2910         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2911                 /* state change only needed when I am in right state */
2912                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2913                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2914                 sctp_start_net_timers(stcb);
2915                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2916                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2917                             stcb->sctp_ep, stcb, asoc->primary_destination);
2918
2919                 }
2920                 /* update RTO */
2921                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2922                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2923                 if (asoc->overall_error_count == 0) {
2924                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2925                             &asoc->time_entered, sctp_align_safe_nocopy,
2926                             SCTP_RTT_FROM_NON_DATA);
2927                 }
2928                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2929                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2930                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2931                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2932 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2933                         struct socket *so;
2934
2935 #endif
2936                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2937 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2938                         so = SCTP_INP_SO(stcb->sctp_ep);
2939                         atomic_add_int(&stcb->asoc.refcnt, 1);
2940                         SCTP_TCB_UNLOCK(stcb);
2941                         SCTP_SOCKET_LOCK(so, 1);
2942                         SCTP_TCB_LOCK(stcb);
2943                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2944 #endif
2945                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2946                                 soisconnected(stcb->sctp_socket);
2947                         }
2948 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2949                         SCTP_SOCKET_UNLOCK(so, 1);
2950 #endif
2951                 }
2952                 /*
2953                  * since we did not send a HB make sure we don't double
2954                  * things
2955                  */
2956                 net->hb_responded = 1;
2957
2958                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2959                         /*
2960                          * We don't need to do the asconf thing, nor hb or
2961                          * autoclose if the socket is closed.
2962                          */
2963                         goto closed_socket;
2964                 }
2965                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2966                     stcb, net);
2967
2968
2969                 if (stcb->asoc.sctp_autoclose_ticks &&
2970                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2971                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2972                             stcb->sctp_ep, stcb, NULL);
2973                 }
2974                 /*
2975                  * send ASCONF if parameters are pending and ASCONFs are
2976                  * allowed (eg. addresses changed when init/cookie echo were
2977                  * in flight)
2978                  */
2979                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2980                     (stcb->asoc.asconf_supported == 1) &&
2981                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2982 #ifdef SCTP_TIMER_BASED_ASCONF
2983                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2984                             stcb->sctp_ep, stcb,
2985                             stcb->asoc.primary_destination);
2986 #else
2987                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2988                             SCTP_ADDR_NOT_LOCKED);
2989 #endif
2990                 }
2991         }
2992 closed_socket:
2993         /* Toss the cookie if I can */
2994         sctp_toss_old_cookies(stcb, asoc);
2995         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2996                 /* Restart the timer if we have pending data */
2997                 struct sctp_tmit_chunk *chk;
2998
2999                 chk = TAILQ_FIRST(&asoc->sent_queue);
3000                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3001         }
3002 }
3003
3004 static void
3005 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3006     struct sctp_tcb *stcb)
3007 {
3008         struct sctp_nets *net;
3009         struct sctp_tmit_chunk *lchk;
3010         struct sctp_ecne_chunk bkup;
3011         uint8_t override_bit;
3012         uint32_t tsn, window_data_tsn;
3013         int len;
3014         unsigned int pkt_cnt;
3015
3016         len = ntohs(cp->ch.chunk_length);
3017         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3018             (len != sizeof(struct old_sctp_ecne_chunk))) {
3019                 return;
3020         }
3021         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3022                 /* Its the old format */
3023                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3024                 bkup.num_pkts_since_cwr = htonl(1);
3025                 cp = &bkup;
3026         }
3027         SCTP_STAT_INCR(sctps_recvecne);
3028         tsn = ntohl(cp->tsn);
3029         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3030         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3031         if (lchk == NULL) {
3032                 window_data_tsn = stcb->asoc.sending_seq - 1;
3033         } else {
3034                 window_data_tsn = lchk->rec.data.TSN_seq;
3035         }
3036
3037         /* Find where it was sent to if possible. */
3038         net = NULL;
3039         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3040                 if (lchk->rec.data.TSN_seq == tsn) {
3041                         net = lchk->whoTo;
3042                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3043                         break;
3044                 }
3045                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3046                         break;
3047                 }
3048         }
3049         if (net == NULL) {
3050                 /*
3051                  * What to do. A previous send of a CWR was possibly lost.
3052                  * See how old it is, we may have it marked on the actual
3053                  * net.
3054                  */
3055                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3056                         if (tsn == net->last_cwr_tsn) {
3057                                 /* Found him, send it off */
3058                                 break;
3059                         }
3060                 }
3061                 if (net == NULL) {
3062                         /*
3063                          * If we reach here, we need to send a special CWR
3064                          * that says hey, we did this a long time ago and
3065                          * you lost the response.
3066                          */
3067                         net = TAILQ_FIRST(&stcb->asoc.nets);
3068                         if (net == NULL) {
3069                                 /* TSNH */
3070                                 return;
3071                         }
3072                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3073                 } else {
3074                         override_bit = 0;
3075                 }
3076         } else {
3077                 override_bit = 0;
3078         }
3079         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3080             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3081                 /*
3082                  * JRS - Use the congestion control given in the pluggable
3083                  * CC module
3084                  */
3085                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3086                 /*
3087                  * We reduce once every RTT. So we will only lower cwnd at
3088                  * the next sending seq i.e. the window_data_tsn
3089                  */
3090                 net->cwr_window_tsn = window_data_tsn;
3091                 net->ecn_ce_pkt_cnt += pkt_cnt;
3092                 net->lost_cnt = pkt_cnt;
3093                 net->last_cwr_tsn = tsn;
3094         } else {
3095                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3096                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3097                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3098                         /*
3099                          * Another loss in the same window update how many
3100                          * marks/packets lost we have had.
3101                          */
3102                         int cnt = 1;
3103
3104                         if (pkt_cnt > net->lost_cnt) {
3105                                 /* Should be the case */
3106                                 cnt = (pkt_cnt - net->lost_cnt);
3107                                 net->ecn_ce_pkt_cnt += cnt;
3108                         }
3109                         net->lost_cnt = pkt_cnt;
3110                         net->last_cwr_tsn = tsn;
3111                         /*
3112                          * Most CC functions will ignore this call, since we
3113                          * are in-window yet of the initial CE the peer saw.
3114                          */
3115                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3116                 }
3117         }
3118         /*
3119          * We always send a CWR this way if our previous one was lost our
3120          * peer will get an update, or if it is not time again to reduce we
3121          * still get the cwr to the peer. Note we set the override when we
3122          * could not find the TSN on the chunk or the destination network.
3123          */
3124         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3125 }
3126
3127 static void
3128 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3129 {
3130         /*
3131          * Here we get a CWR from the peer. We must look in the outqueue and
3132          * make sure that we have a covered ECNE in the control chunk part.
3133          * If so remove it.
3134          */
3135         struct sctp_tmit_chunk *chk;
3136         struct sctp_ecne_chunk *ecne;
3137         int override;
3138         uint32_t cwr_tsn;
3139
3140         cwr_tsn = ntohl(cp->tsn);
3141         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3142         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3143                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3144                         continue;
3145                 }
3146                 if ((override == 0) && (chk->whoTo != net)) {
3147                         /* Must be from the right src unless override is set */
3148                         continue;
3149                 }
3150                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3151                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3152                         /* this covers this ECNE, we can remove it */
3153                         stcb->asoc.ecn_echo_cnt_onq--;
3154                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3155                             sctp_next);
3156                         sctp_m_freem(chk->data);
3157                         chk->data = NULL;
3158                         stcb->asoc.ctrl_queue_cnt--;
3159                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3160                         if (override == 0) {
3161                                 break;
3162                         }
3163                 }
3164         }
3165 }
3166
3167 static void
3168 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3169     struct sctp_tcb *stcb, struct sctp_nets *net)
3170 {
3171         struct sctp_association *asoc;
3172
3173 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3174         struct socket *so;
3175
3176 #endif
3177
3178         SCTPDBG(SCTP_DEBUG_INPUT2,
3179             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3180         if (stcb == NULL)
3181                 return;
3182
3183         asoc = &stcb->asoc;
3184         /* process according to association state */
3185         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3186                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3187                 SCTPDBG(SCTP_DEBUG_INPUT2,
3188                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3189                 SCTP_TCB_UNLOCK(stcb);
3190                 return;
3191         }
3192         /* notify upper layer protocol */
3193         if (stcb->sctp_socket) {
3194                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3195         }
3196 #ifdef INVARIANTS
3197         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3198             !TAILQ_EMPTY(&asoc->sent_queue) ||
3199             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3200                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3201         }
3202 #endif
3203         /* stop the timer */
3204         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3205             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3206         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3207         /* free the TCB */
3208         SCTPDBG(SCTP_DEBUG_INPUT2,
3209             "sctp_handle_shutdown_complete: calls free-asoc\n");
3210 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3211         so = SCTP_INP_SO(stcb->sctp_ep);
3212         atomic_add_int(&stcb->asoc.refcnt, 1);
3213         SCTP_TCB_UNLOCK(stcb);
3214         SCTP_SOCKET_LOCK(so, 1);
3215         SCTP_TCB_LOCK(stcb);
3216         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3217 #endif
3218         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3219             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3220 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3221         SCTP_SOCKET_UNLOCK(so, 1);
3222 #endif
3223         return;
3224 }
3225
3226 static int
3227 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3228     struct sctp_nets *net, uint8_t flg)
3229 {
3230         switch (desc->chunk_type) {
3231         case SCTP_DATA:
3232                 /* find the tsn to resend (possibly */
3233                 {
3234                         uint32_t tsn;
3235                         struct sctp_tmit_chunk *tp1;
3236
3237                         tsn = ntohl(desc->tsn_ifany);
3238                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3239                                 if (tp1->rec.data.TSN_seq == tsn) {
3240                                         /* found it */
3241                                         break;
3242                                 }
3243                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3244                                         /* not found */
3245                                         tp1 = NULL;
3246                                         break;
3247                                 }
3248                         }
3249                         if (tp1 == NULL) {
3250                                 /*
3251                                  * Do it the other way , aka without paying
3252                                  * attention to queue seq order.
3253                                  */
3254                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3255                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3256                                         if (tp1->rec.data.TSN_seq == tsn) {
3257                                                 /* found it */
3258                                                 break;
3259                                         }
3260                                 }
3261                         }
3262                         if (tp1 == NULL) {
3263                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3264                         }
3265                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3266                                 uint8_t *ddp;
3267
3268                                 if (((flg & SCTP_BADCRC) == 0) &&
3269                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3270                                         return (0);
3271                                 }
3272                                 if ((stcb->asoc.peers_rwnd == 0) &&
3273                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3274                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3275                                         return (0);
3276                                 }
3277                                 if (stcb->asoc.peers_rwnd == 0 &&
3278                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3279                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3280                                         return (0);
3281                                 }
3282                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3283                                     sizeof(struct sctp_data_chunk));
3284                                 {
3285                                         unsigned int iii;
3286
3287                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3288                                             iii++) {
3289                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3290                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3291                                                         return (-1);
3292                                                 }
3293                                         }
3294                                 }
3295
3296                                 if (tp1->do_rtt) {
3297                                         /*
3298                                          * this guy had a RTO calculation
3299                                          * pending on it, cancel it
3300                                          */
3301                                         if (tp1->whoTo->rto_needed == 0) {
3302                                                 tp1->whoTo->rto_needed = 1;
3303                                         }
3304                                         tp1->do_rtt = 0;
3305                                 }
3306                                 SCTP_STAT_INCR(sctps_pdrpmark);
3307                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3308                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3309                                 /*
3310                                  * mark it as if we were doing a FR, since
3311                                  * we will be getting gap ack reports behind
3312                                  * the info from the router.
3313                                  */
3314                                 tp1->rec.data.doing_fast_retransmit = 1;
3315                                 /*
3316                                  * mark the tsn with what sequences can
3317                                  * cause a new FR.
3318                                  */
3319                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3320                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3321                                 } else {
3322                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3323                                 }
3324
3325                                 /* restart the timer */
3326                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3327                                     stcb, tp1->whoTo,
3328                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3329                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3330                                     stcb, tp1->whoTo);
3331
3332                                 /* fix counts and things */
3333                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3334                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3335                                             tp1->whoTo->flight_size,
3336                                             tp1->book_size,
3337                                             (uintptr_t) stcb,
3338                                             tp1->rec.data.TSN_seq);
3339                                 }
3340                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3341                                         sctp_flight_size_decrease(tp1);
3342                                         sctp_total_flight_decrease(stcb, tp1);
3343                                 }
3344                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3345                         } {
3346                                 /* audit code */
3347                                 unsigned int audit;
3348
3349                                 audit = 0;
3350                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3351                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3352                                                 audit++;
3353                                 }
3354                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3355                                     sctp_next) {
3356                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3357                                                 audit++;
3358                                 }
3359                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3360                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3361                                             audit, stcb->asoc.sent_queue_retran_cnt);
3362 #ifndef SCTP_AUDITING_ENABLED
3363                                         stcb->asoc.sent_queue_retran_cnt = audit;
3364 #endif
3365                                 }
3366                         }
3367                 }
3368                 break;
3369         case SCTP_ASCONF:
3370                 {
3371                         struct sctp_tmit_chunk *asconf;
3372
3373                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3374                             sctp_next) {
3375                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3376                                         break;
3377                                 }
3378                         }
3379                         if (asconf) {
3380                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3381                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3382                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3383                                 asconf->snd_count--;
3384                         }
3385                 }
3386                 break;
3387         case SCTP_INITIATION:
3388                 /* resend the INIT */
3389                 stcb->asoc.dropped_special_cnt++;
3390                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3391                         /*
3392                          * If we can get it in, in a few attempts we do
3393                          * this, otherwise we let the timer fire.
3394                          */
3395                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3396                             stcb, net,
3397                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3398                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3399                 }
3400                 break;
3401         case SCTP_SELECTIVE_ACK:
3402         case SCTP_NR_SELECTIVE_ACK:
3403                 /* resend the sack */
3404                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3405                 break;
3406         case SCTP_HEARTBEAT_REQUEST:
3407                 /* resend a demand HB */
3408                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3409                         /*
3410                          * Only retransmit if we KNOW we wont destroy the
3411                          * tcb
3412                          */
3413                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3414                 }
3415                 break;
3416         case SCTP_SHUTDOWN:
3417                 sctp_send_shutdown(stcb, net);
3418                 break;
3419         case SCTP_SHUTDOWN_ACK:
3420                 sctp_send_shutdown_ack(stcb, net);
3421                 break;
3422         case SCTP_COOKIE_ECHO:
3423                 {
3424                         struct sctp_tmit_chunk *cookie;
3425
3426                         cookie = NULL;
3427                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3428                             sctp_next) {
3429                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3430                                         break;
3431                                 }
3432                         }
3433                         if (cookie) {
3434                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3435                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3436                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3437                                 sctp_stop_all_cookie_timers(stcb);
3438                         }
3439                 }
3440                 break;
3441         case SCTP_COOKIE_ACK:
3442                 sctp_send_cookie_ack(stcb);
3443                 break;
3444         case SCTP_ASCONF_ACK:
3445                 /* resend last asconf ack */
3446                 sctp_send_asconf_ack(stcb);
3447                 break;
3448         case SCTP_FORWARD_CUM_TSN:
3449                 send_forward_tsn(stcb, &stcb->asoc);
3450                 break;
3451                 /* can't do anything with these */
3452         case SCTP_PACKET_DROPPED:
3453         case SCTP_INITIATION_ACK:       /* this should not happen */
3454         case SCTP_HEARTBEAT_ACK:
3455         case SCTP_ABORT_ASSOCIATION:
3456         case SCTP_OPERATION_ERROR:
3457         case SCTP_SHUTDOWN_COMPLETE:
3458         case SCTP_ECN_ECHO:
3459         case SCTP_ECN_CWR:
3460         default:
3461                 break;
3462         }
3463         return (0);
3464 }
3465
3466 void
3467 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3468 {
3469         uint32_t i;
3470         uint16_t temp;
3471
3472         /*
3473          * We set things to 0xffff since this is the last delivered sequence
3474          * and we will be sending in 0 after the reset.
3475          */
3476
3477         if (number_entries) {
3478                 for (i = 0; i < number_entries; i++) {
3479                         temp = ntohs(list[i]);
3480                         if (temp >= stcb->asoc.streamincnt) {
3481                                 continue;
3482                         }
3483                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3484                 }
3485         } else {
3486                 list = NULL;
3487                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3488                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3489                 }
3490         }
3491         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3492 }
3493
3494 static void
3495 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3496 {
3497         uint32_t i;
3498         uint16_t temp;
3499
3500         if (number_entries > 0) {
3501                 for (i = 0; i < number_entries; i++) {
3502                         temp = ntohs(list[i]);
3503                         if (temp >= stcb->asoc.streamoutcnt) {
3504                                 /* no such stream */
3505                                 continue;
3506                         }
3507                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3508                 }
3509         } else {
3510                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3511                         stcb->asoc.strmout[i].next_sequence_send = 0;
3512                 }
3513         }
3514         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3515 }
3516
3517 static void
3518 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3519 {
3520         uint32_t i;
3521         uint16_t temp;
3522
3523         if (number_entries > 0) {
3524                 for (i = 0; i < number_entries; i++) {
3525                         temp = ntohs(list[i]);
3526                         if (temp >= stcb->asoc.streamoutcnt) {
3527                                 /* no such stream */
3528                                 continue;
3529                         }
3530                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3531                 }
3532         } else {
3533                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3534                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3535                 }
3536         }
3537 }
3538
3539
3540 struct sctp_stream_reset_request *
3541 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3542 {
3543         struct sctp_association *asoc;
3544         struct sctp_chunkhdr *ch;
3545         struct sctp_stream_reset_request *r;
3546         struct sctp_tmit_chunk *chk;
3547         int len, clen;
3548
3549         asoc = &stcb->asoc;
3550         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3551                 asoc->stream_reset_outstanding = 0;
3552                 return (NULL);
3553         }
3554         if (stcb->asoc.str_reset == NULL) {
3555                 asoc->stream_reset_outstanding = 0;
3556                 return (NULL);
3557         }
3558         chk = stcb->asoc.str_reset;
3559         if (chk->data == NULL) {
3560                 return (NULL);
3561         }
3562         if (bchk) {
3563                 /* he wants a copy of the chk pointer */
3564                 *bchk = chk;
3565         }
3566         clen = chk->send_size;
3567         ch = mtod(chk->data, struct sctp_chunkhdr *);
3568         r = (struct sctp_stream_reset_request *)(ch + 1);
3569         if (ntohl(r->request_seq) == seq) {
3570                 /* found it */
3571                 return (r);
3572         }
3573         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3574         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3575                 /* move to the next one, there can only be a max of two */
3576                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3577                 if (ntohl(r->request_seq) == seq) {
3578                         return (r);
3579                 }
3580         }
3581         /* that seq is not here */
3582         return (NULL);
3583 }
3584
3585 static void
3586 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3587 {
3588         struct sctp_association *asoc;
3589         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3590
3591         if (stcb->asoc.str_reset == NULL) {
3592                 return;
3593         }
3594         asoc = &stcb->asoc;
3595
3596         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3597             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3598         TAILQ_REMOVE(&asoc->control_send_queue,
3599             chk,
3600             sctp_next);
3601         if (chk->data) {
3602                 sctp_m_freem(chk->data);
3603                 chk->data = NULL;
3604         }
3605         asoc->ctrl_queue_cnt--;
3606         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3607         /* sa_ignore NO_NULL_CHK */
3608         stcb->asoc.str_reset = NULL;
3609 }
3610
3611
3612 static int
3613 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3614     uint32_t seq, uint32_t action,
3615     struct sctp_stream_reset_response *respin)
3616 {
3617         uint16_t type;
3618         int lparm_len;
3619         struct sctp_association *asoc = &stcb->asoc;
3620         struct sctp_tmit_chunk *chk;
3621         struct sctp_stream_reset_request *req_param;
3622         struct sctp_stream_reset_out_request *req_out_param;
3623         struct sctp_stream_reset_in_request *req_in_param;
3624         uint32_t number_entries;
3625
3626         if (asoc->stream_reset_outstanding == 0) {
3627                 /* duplicate */
3628                 return (0);
3629         }
3630         if (seq == stcb->asoc.str_reset_seq_out) {
3631                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3632                 if (req_param != NULL) {
3633                         stcb->asoc.str_reset_seq_out++;
3634                         type = ntohs(req_param->ph.param_type);
3635                         lparm_len = ntohs(req_param->ph.param_length);
3636                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3637                                 int no_clear = 0;
3638
3639                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3640                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3641                                 asoc->stream_reset_out_is_outstanding = 0;
3642                                 if (asoc->stream_reset_outstanding)
3643                                         asoc->stream_reset_outstanding--;
3644                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3645                                         /* do it */
3646                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3647                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3648                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3649                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3650                                         /*
3651                                          * Set it up so we don't stop
3652                                          * retransmitting
3653                                          */
3654                                         stcb->asoc.str_reset_seq_out--;
3655                                         asoc->stream_reset_out_is_outstanding = 1;
3656                                         no_clear = 1;
3657                                 } else {
3658                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3659                                 }
3660                                 if (no_clear == 0) {
3661                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3662                                 }
3663                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3664                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3665                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3666                                 if (asoc->stream_reset_outstanding)
3667                                         asoc->stream_reset_outstanding--;
3668                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3669                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3670                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3671                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3672                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3673                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3674                                 }
3675                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3676                                 /* Ok we now may have more streams */
3677                                 int num_stream;
3678
3679                                 num_stream = stcb->asoc.strm_pending_add_size;
3680                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3681                                         /* TSNH */
3682                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3683                                 }
3684                                 stcb->asoc.strm_pending_add_size = 0;
3685                                 if (asoc->stream_reset_outstanding)
3686                                         asoc->stream_reset_outstanding--;
3687                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3688                                         /* Put the new streams into effect */
3689                                         int i;
3690
3691                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3692                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3693                                         }
3694                                         asoc->streamoutcnt += num_stream;
3695                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3696                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3697                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3698                                             SCTP_STREAM_CHANGE_DENIED);
3699                                 } else {
3700                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3701                                             SCTP_STREAM_CHANGE_FAILED);
3702                                 }
3703                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3704                                 if (asoc->stream_reset_outstanding)
3705                                         asoc->stream_reset_outstanding--;
3706                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3707                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3708                                             SCTP_STREAM_CHANGE_DENIED);
3709                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3710                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3711                                             SCTP_STREAM_CHANGE_FAILED);
3712                                 }
3713                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3714                                 /**
3715                                  * a) Adopt the new in tsn.
3716                                  * b) reset the map
3717                                  * c) Adopt the new out-tsn
3718                                  */
3719                                 struct sctp_stream_reset_response_tsn *resp;
3720                                 struct sctp_forward_tsn_chunk fwdtsn;
3721                                 int abort_flag = 0;
3722
3723                                 if (respin == NULL) {
3724                                         /* huh ? */
3725                                         return (0);
3726                                 }
3727                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3728                                         return (0);
3729                                 }
3730                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3731                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3732                                         asoc->stream_reset_outstanding--;
3733                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3734                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3735                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3736                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3737                                         if (abort_flag) {
3738                                                 return (1);
3739                                         }
3740                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3741                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3742                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3743                                         }
3744                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3745                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3746                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3747
3748                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3749                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3750
3751                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3752                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3753
3754                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3755                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3756                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3757                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3758                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3759                                             SCTP_ASSOC_RESET_DENIED);
3760                                 } else {
3761                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3762                                             SCTP_ASSOC_RESET_FAILED);
3763                                 }
3764                         }
3765                         /* get rid of the request and get the request flags */
3766                         if (asoc->stream_reset_outstanding == 0) {
3767                                 sctp_clean_up_stream_reset(stcb);
3768                         }
3769                 }
3770         }
3771         if (asoc->stream_reset_outstanding == 0) {
3772                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3773         }
3774         return (0);
3775 }
3776
3777 static void
3778 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3779     struct sctp_tmit_chunk *chk,
3780     struct sctp_stream_reset_in_request *req, int trunc)
3781 {
3782         uint32_t seq;
3783         int len, i;
3784         int number_entries;
3785         uint16_t temp;
3786
3787         /*
3788          * peer wants me to send a str-reset to him for my outgoing seq's if
3789          * seq_in is right.
3790          */
3791         struct sctp_association *asoc = &stcb->asoc;
3792
3793         seq = ntohl(req->request_seq);
3794         if (asoc->str_reset_seq_in == seq) {
3795                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3796                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3797                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3798                 } else if (trunc) {
3799                         /* Can't do it, since they exceeded our buffer size  */
3800                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3801                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3802                         len = ntohs(req->ph.param_length);
3803                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3804                         if (number_entries) {
3805                                 for (i = 0; i < number_entries; i++) {
3806                                         temp = ntohs(req->list_of_streams[i]);
3807                                         if (temp >= stcb->asoc.streamoutcnt) {
3808                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3809                                                 goto bad_boy;
3810                                         }
3811                                         req->list_of_streams[i] = temp;
3812                                 }
3813                                 for (i = 0; i < number_entries; i++) {
3814                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3815                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3816                                         }
3817                                 }
3818                         } else {
3819                                 /* Its all */
3820                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3821                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3822                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3823                                 }
3824                         }
3825                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3826                 } else {
3827                         /* Can't do it, since we have sent one out */
3828                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3829                 }
3830 bad_boy:
3831                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3832                 asoc->str_reset_seq_in++;
3833         } else if (asoc->str_reset_seq_in - 1 == seq) {
3834                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3835         } else if (asoc->str_reset_seq_in - 2 == seq) {
3836                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3837         } else {
3838                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3839         }
3840         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3841 }
3842
3843 static int
3844 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3845     struct sctp_tmit_chunk *chk,
3846     struct sctp_stream_reset_tsn_request *req)
3847 {
3848         /* reset all in and out and update the tsn */
3849         /*
3850          * A) reset my str-seq's on in and out. B) Select a receive next,
3851          * and set cum-ack to it. Also process this selected number as a
3852          * fwd-tsn as well. C) set in the response my next sending seq.
3853          */
3854         struct sctp_forward_tsn_chunk fwdtsn;
3855         struct sctp_association *asoc = &stcb->asoc;
3856         int abort_flag = 0;
3857         uint32_t seq;
3858
3859         seq = ntohl(req->request_seq);
3860         if (asoc->str_reset_seq_in == seq) {
3861                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3862                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3863                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3864                 } else {
3865                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3866                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3867                         fwdtsn.ch.chunk_flags = 0;
3868                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3869                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3870                         if (abort_flag) {
3871                                 return (1);
3872                         }
3873                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3874                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3875                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3876                         }
3877                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3878                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3879                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3880                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3881                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3882                         atomic_add_int(&asoc->sending_seq, 1);
3883                         /* save off historical data for retrans */
3884                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3885                         asoc->last_sending_seq[0] = asoc->sending_seq;
3886                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3887                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3888                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3889                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3890                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3891                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3892                 }
3893                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3894                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3895                 asoc->str_reset_seq_in++;
3896         } else if (asoc->str_reset_seq_in - 1 == seq) {
3897                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3898                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3899         } else if (asoc->str_reset_seq_in - 2 == seq) {
3900                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3901                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3902         } else {
3903                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3904         }
3905         return (0);
3906 }
3907
3908 static void
3909 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3910     struct sctp_tmit_chunk *chk,
3911     struct sctp_stream_reset_out_request *req, int trunc)
3912 {
3913         uint32_t seq, tsn;
3914         int number_entries, len;
3915         struct sctp_association *asoc = &stcb->asoc;
3916
3917         seq = ntohl(req->request_seq);
3918
3919         /* now if its not a duplicate we process it */
3920         if (asoc->str_reset_seq_in == seq) {
3921                 len = ntohs(req->ph.param_length);
3922                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3923                 /*
3924                  * the sender is resetting, handle the list issue.. we must
3925                  * a) verify if we can do the reset, if so no problem b) If
3926                  * we can't do the reset we must copy the request. c) queue
3927                  * it, and setup the data in processor to trigger it off
3928                  * when needed and dequeue all the queued data.
3929                  */
3930                 tsn = ntohl(req->send_reset_at_tsn);
3931
3932                 /* move the reset action back one */
3933                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3934                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3935                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3936                 } else if (trunc) {
3937                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3938                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3939                         /* we can do it now */
3940                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3941                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3942                 } else {
3943                         /*
3944                          * we must queue it up and thus wait for the TSN's
3945                          * to arrive that are at or before tsn
3946                          */
3947                         struct sctp_stream_reset_list *liste;
3948                         int siz;
3949
3950                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3951                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3952                             siz, SCTP_M_STRESET);
3953                         if (liste == NULL) {
3954                                 /* gak out of memory */
3955                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3956                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3957                                 return;
3958                         }
3959                         liste->seq = seq;
3960                         liste->tsn = tsn;
3961                         liste->number_entries = number_entries;
3962                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3963                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3964                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3965                 }
3966                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3967                 asoc->str_reset_seq_in++;
3968         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3969                 /*
3970                  * one seq back, just echo back last action since my
3971                  * response was lost.
3972                  */
3973                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3974         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3975                 /*
3976                  * two seq back, just echo back last action since my
3977                  * response was lost.
3978                  */
3979                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3980         } else {
3981                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3982         }
3983 }
3984
3985 static void
3986 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3987     struct sctp_stream_reset_add_strm *str_add)
3988 {
3989         /*
3990          * Peer is requesting to add more streams. If its within our
3991          * max-streams we will allow it.
3992          */
3993         uint32_t num_stream, i;
3994         uint32_t seq;
3995         struct sctp_association *asoc = &stcb->asoc;
3996         struct sctp_queued_to_read *ctl, *nctl;
3997
3998         /* Get the number. */
3999         seq = ntohl(str_add->request_seq);
4000         num_stream = ntohs(str_add->number_of_streams);
4001         /* Now what would be the new total? */
4002         if (asoc->str_reset_seq_in == seq) {
4003                 num_stream += stcb->asoc.streamincnt;
4004                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4005                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4006                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4007                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4008                     (num_stream > 0xffff)) {
4009                         /* We must reject it they ask for to many */
4010         denied:
4011                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4012                 } else {
4013                         /* Ok, we can do that :-) */
4014                         struct sctp_stream_in *oldstrm;
4015
4016                         /* save off the old */
4017                         oldstrm = stcb->asoc.strmin;
4018                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4019                             (num_stream * sizeof(struct sctp_stream_in)),
4020                             SCTP_M_STRMI);
4021                         if (stcb->asoc.strmin == NULL) {
4022                                 stcb->asoc.strmin = oldstrm;
4023                                 goto denied;
4024                         }
4025                         /* copy off the old data */
4026                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4027                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4028                                 stcb->asoc.strmin[i].stream_no = i;
4029                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
4030                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4031                                 /* now anything on those queues? */
4032                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
4033                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
4034                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
4035                                 }
4036                         }
4037                         /* Init the new streams */
4038                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4039                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4040                                 stcb->asoc.strmin[i].stream_no = i;
4041                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
4042                                 stcb->asoc.strmin[i].delivery_started = 0;
4043                         }
4044                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4045                         /* update the size */
4046                         stcb->asoc.streamincnt = num_stream;
4047                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4048                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4049                 }
4050                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4051                 asoc->str_reset_seq_in++;
4052         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4053                 /*
4054                  * one seq back, just echo back last action since my
4055                  * response was lost.
4056                  */
4057                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4058         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4059                 /*
4060                  * two seq back, just echo back last action since my
4061                  * response was lost.
4062                  */
4063                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4064         } else {
4065                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4066
4067         }
4068 }
4069
4070 static void
4071 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4072     struct sctp_stream_reset_add_strm *str_add)
4073 {
4074         /*
4075          * Peer is requesting to add more streams. If its within our
4076          * max-streams we will allow it.
4077          */
4078         uint16_t num_stream;
4079         uint32_t seq;
4080         struct sctp_association *asoc = &stcb->asoc;
4081
4082         /* Get the number. */
4083         seq = ntohl(str_add->request_seq);
4084         num_stream = ntohs(str_add->number_of_streams);
4085         /* Now what would be the new total? */
4086         if (asoc->str_reset_seq_in == seq) {
4087                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4088                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4089                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4090                 } else if (stcb->asoc.stream_reset_outstanding) {
4091                         /* We must reject it we have something pending */
4092                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4093                 } else {
4094                         /* Ok, we can do that :-) */
4095                         int mychk;
4096
4097                         mychk = stcb->asoc.streamoutcnt;
4098                         mychk += num_stream;
4099                         if (mychk < 0x10000) {
4100                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4101                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4102                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4103                                 }
4104                         } else {
4105                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4106                         }
4107                 }
4108                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4109                 asoc->str_reset_seq_in++;
4110         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4111                 /*
4112                  * one seq back, just echo back last action since my
4113                  * response was lost.
4114                  */
4115                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4116         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4117                 /*
4118                  * two seq back, just echo back last action since my
4119                  * response was lost.
4120                  */
4121                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4122         } else {
4123                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4124         }
4125 }
4126
4127 #ifdef __GNUC__
4128 __attribute__((noinline))
4129 #endif
4130         static int
4131             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4132         struct sctp_chunkhdr *ch_req)
4133 {
4134         uint16_t remaining_length, param_len, ptype;
4135         struct sctp_paramhdr pstore;
4136         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4137         uint32_t seq = 0;
4138         int num_req = 0;
4139         int trunc = 0;
4140         struct sctp_tmit_chunk *chk;
4141         struct sctp_chunkhdr *ch;
4142         struct sctp_paramhdr *ph;
4143         int ret_code = 0;
4144         int num_param = 0;
4145
4146         /* now it may be a reset or a reset-response */
4147         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4148
4149         /* setup for adding the response */
4150         sctp_alloc_a_chunk(stcb, chk);
4151         if (chk == NULL) {
4152                 return (ret_code);
4153         }
4154         chk->copy_by_ref = 0;
4155         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4156         chk->rec.chunk_id.can_take_data = 0;
4157         chk->flags = 0;
4158         chk->asoc = &stcb->asoc;
4159         chk->no_fr_allowed = 0;
4160         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4161         chk->book_size_scale = 0;
4162         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4163         if (chk->data == NULL) {
4164 strres_nochunk:
4165                 if (chk->data) {
4166                         sctp_m_freem(chk->data);
4167                         chk->data = NULL;
4168                 }
4169                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4170                 return (ret_code);
4171         }
4172         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4173
4174         /* setup chunk parameters */
4175         chk->sent = SCTP_DATAGRAM_UNSENT;
4176         chk->snd_count = 0;
4177         chk->whoTo = NULL;
4178
4179         ch = mtod(chk->data, struct sctp_chunkhdr *);
4180         ch->chunk_type = SCTP_STREAM_RESET;
4181         ch->chunk_flags = 0;
4182         ch->chunk_length = htons(chk->send_size);
4183         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4184         offset += sizeof(struct sctp_chunkhdr);
4185         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4186                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4187                 if (ph == NULL) {
4188                         /* TSNH */
4189                         break;
4190                 }
4191                 param_len = ntohs(ph->param_length);
4192                 if ((param_len > remaining_length) ||
4193                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4194                         /* bad parameter length */
4195                         break;
4196                 }
4197                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4198                     (uint8_t *) & cstore);
4199                 if (ph == NULL) {
4200                         /* TSNH */
4201                         break;
4202                 }
4203                 ptype = ntohs(ph->param_type);
4204                 num_param++;
4205                 if (param_len > sizeof(cstore)) {
4206                         trunc = 1;
4207                 } else {
4208                         trunc = 0;
4209                 }
4210                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4211                         /* hit the max of parameters already sorry.. */
4212                         break;
4213                 }
4214                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4215                         struct sctp_stream_reset_out_request *req_out;
4216
4217                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4218                                 break;
4219                         }
4220                         req_out = (struct sctp_stream_reset_out_request *)ph;
4221                         num_req++;
4222                         if (stcb->asoc.stream_reset_outstanding) {
4223                                 seq = ntohl(req_out->response_seq);
4224                                 if (seq == stcb->asoc.str_reset_seq_out) {
4225                                         /* implicit ack */
4226                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4227                                 }
4228                         }
4229                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4230                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4231                         struct sctp_stream_reset_add_strm *str_add;
4232
4233                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4234                                 break;
4235                         }
4236                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4237                         num_req++;
4238                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4239                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4240                         struct sctp_stream_reset_add_strm *str_add;
4241
4242                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4243                                 break;
4244                         }
4245                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4246                         num_req++;
4247                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4248                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4249                         struct sctp_stream_reset_in_request *req_in;
4250
4251                         num_req++;
4252                         req_in = (struct sctp_stream_reset_in_request *)ph;
4253                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4254                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4255                         struct sctp_stream_reset_tsn_request *req_tsn;
4256
4257                         num_req++;
4258                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4259                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4260                                 ret_code = 1;
4261                                 goto strres_nochunk;
4262                         }
4263                         /* no more */
4264                         break;
4265                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4266                         struct sctp_stream_reset_response *resp;
4267                         uint32_t result;
4268
4269                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4270                                 break;
4271                         }
4272                         resp = (struct sctp_stream_reset_response *)ph;
4273                         seq = ntohl(resp->response_seq);
4274                         result = ntohl(resp->result);
4275                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4276                                 ret_code = 1;
4277                                 goto strres_nochunk;
4278                         }
4279                 } else {
4280                         break;
4281                 }
4282                 offset += SCTP_SIZE32(param_len);
4283                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4284                         remaining_length -= SCTP_SIZE32(param_len);
4285                 } else {
4286                         remaining_length = 0;
4287                 }
4288         }
4289         if (num_req == 0) {
4290                 /* we have no response free the stuff */
4291                 goto strres_nochunk;
4292         }
4293         /* ok we have a chunk to link in */
4294         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4295             chk,
4296             sctp_next);
4297         stcb->asoc.ctrl_queue_cnt++;
4298         return (ret_code);
4299 }
4300
4301 /*
4302  * Handle a router or endpoints report of a packet loss, there are two ways
4303  * to handle this, either we get the whole packet and must disect it
4304  * ourselves (possibly with truncation and or corruption) or it is a summary
4305  * from a middle box that did the disectting for us.
4306  */
4307 static void
4308 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4309     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4310 {
4311         uint32_t bottle_bw, on_queue;
4312         uint16_t trunc_len;
4313         unsigned int chlen;
4314         unsigned int at;
4315         struct sctp_chunk_desc desc;
4316         struct sctp_chunkhdr *ch;
4317
4318         chlen = ntohs(cp->ch.chunk_length);
4319         chlen -= sizeof(struct sctp_pktdrop_chunk);
4320         /* XXX possible chlen underflow */
4321         if (chlen == 0) {
4322                 ch = NULL;
4323                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4324                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4325         } else {
4326                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4327                 chlen -= sizeof(struct sctphdr);
4328                 /* XXX possible chlen underflow */
4329                 memset(&desc, 0, sizeof(desc));
4330         }
4331         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4332         if (trunc_len > limit) {
4333                 trunc_len = limit;
4334         }
4335         /* now the chunks themselves */
4336         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4337                 desc.chunk_type = ch->chunk_type;
4338                 /* get amount we need to move */
4339                 at = ntohs(ch->chunk_length);
4340                 if (at < sizeof(struct sctp_chunkhdr)) {
4341                         /* corrupt chunk, maybe at the end? */
4342                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4343                         break;
4344                 }
4345                 if (trunc_len == 0) {
4346                         /* we are supposed to have all of it */
4347                         if (at > chlen) {
4348                                 /* corrupt skip it */
4349                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4350                                 break;
4351                         }
4352                 } else {
4353                         /* is there enough of it left ? */
4354                         if (desc.chunk_type == SCTP_DATA) {
4355                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4356                                     sizeof(desc.data_bytes))) {
4357                                         break;
4358                                 }
4359                         } else {
4360                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4361                                         break;
4362                                 }
4363                         }
4364                 }
4365                 if (desc.chunk_type == SCTP_DATA) {
4366                         /* can we get out the tsn? */
4367                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4368                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4369
4370                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4371                                 /* yep */
4372                                 struct sctp_data_chunk *dcp;
4373                                 uint8_t *ddp;
4374                                 unsigned int iii;
4375
4376                                 dcp = (struct sctp_data_chunk *)ch;
4377                                 ddp = (uint8_t *) (dcp + 1);
4378                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4379                                         desc.data_bytes[iii] = ddp[iii];
4380                                 }
4381                                 desc.tsn_ifany = dcp->dp.tsn;
4382                         } else {
4383                                 /* nope we are done. */
4384                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4385                                 break;
4386                         }
4387                 } else {
4388                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4389                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4390                 }
4391
4392                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4393                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4394                         break;
4395                 }
4396                 if (SCTP_SIZE32(at) > chlen) {
4397                         break;
4398                 }
4399                 chlen -= SCTP_SIZE32(at);
4400                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4401                         /* done, none left */
4402                         break;
4403                 }
4404                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4405         }
4406         /* Now update any rwnd --- possibly */
4407         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4408                 /* From a peer, we get a rwnd report */
4409                 uint32_t a_rwnd;
4410
4411                 SCTP_STAT_INCR(sctps_pdrpfehos);
4412
4413                 bottle_bw = ntohl(cp->bottle_bw);
4414                 on_queue = ntohl(cp->current_onq);
4415                 if (bottle_bw && on_queue) {
4416                         /* a rwnd report is in here */
4417                         if (bottle_bw > on_queue)
4418                                 a_rwnd = bottle_bw - on_queue;
4419                         else
4420                                 a_rwnd = 0;
4421
4422                         if (a_rwnd == 0)
4423                                 stcb->asoc.peers_rwnd = 0;
4424                         else {
4425                                 if (a_rwnd > stcb->asoc.total_flight) {
4426                                         stcb->asoc.peers_rwnd =
4427                                             a_rwnd - stcb->asoc.total_flight;
4428                                 } else {
4429                                         stcb->asoc.peers_rwnd = 0;
4430                                 }
4431                                 if (stcb->asoc.peers_rwnd <
4432                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4433                                         /* SWS sender side engages */
4434                                         stcb->asoc.peers_rwnd = 0;
4435                                 }
4436                         }
4437                 }
4438         } else {
4439                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4440         }
4441
4442         /* now middle boxes in sat networks get a cwnd bump */
4443         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4444             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4445             (stcb->asoc.sat_network)) {
4446                 /*
4447                  * This is debateable but for sat networks it makes sense
4448                  * Note if a T3 timer has went off, we will prohibit any
4449                  * changes to cwnd until we exit the t3 loss recovery.
4450                  */
4451                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4452                     net, cp, &bottle_bw, &on_queue);
4453         }
4454 }
4455
4456 /*
4457  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4458  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4459  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4460  * length of the complete packet outputs: - length: modified to remaining
4461  * length after control processing - netp: modified to new sctp_nets after
4462  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4463  * bad packet,...) otherwise return the tcb for this packet
4464  */
4465 #ifdef __GNUC__
4466 __attribute__((noinline))
4467 #endif
4468         static struct sctp_tcb *
4469                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4470              struct sockaddr *src, struct sockaddr *dst,
4471              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4472              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4473              uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4474              uint32_t vrf_id, uint16_t port)
4475 {
4476         struct sctp_association *asoc;
4477         struct mbuf *op_err;
4478         char msg[SCTP_DIAG_INFO_LEN];
4479         uint32_t vtag_in;
4480         int num_chunks = 0;     /* number of control chunks processed */
4481         uint32_t chk_length;
4482         int ret;
4483         int abort_no_unlock = 0;
4484         int ecne_seen = 0;
4485
4486         /*
4487          * How big should this be, and should it be alloc'd? Lets try the
4488          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4489          * until we get into jumbo grams and such..
4490          */
4491         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4492         struct sctp_tcb *locked_tcb = stcb;
4493         int got_auth = 0;
4494         uint32_t auth_offset = 0, auth_len = 0;
4495         int auth_skipped = 0;
4496         int asconf_cnt = 0;
4497
4498 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4499         struct socket *so;
4500
4501 #endif
4502
4503         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4504             iphlen, *offset, length, (void *)stcb);
4505
4506         /* validate chunk header length... */
4507         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4508                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4509                     ntohs(ch->chunk_length));
4510                 if (locked_tcb) {
4511                         SCTP_TCB_UNLOCK(locked_tcb);
4512                 }
4513                 return (NULL);
4514         }
4515         /*
4516          * validate the verification tag
4517          */
4518         vtag_in = ntohl(sh->v_tag);
4519
4520         if (locked_tcb) {
4521                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4522         }
4523         if (ch->chunk_type == SCTP_INITIATION) {
4524                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4525                     ntohs(ch->chunk_length), vtag_in);
4526                 if (vtag_in != 0) {
4527                         /* protocol error- silently discard... */
4528                         SCTP_STAT_INCR(sctps_badvtag);
4529                         if (locked_tcb) {
4530                                 SCTP_TCB_UNLOCK(locked_tcb);
4531                         }
4532                         return (NULL);
4533                 }
4534         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4535                 /*
4536                  * If there is no stcb, skip the AUTH chunk and process
4537                  * later after a stcb is found (to validate the lookup was
4538                  * valid.
4539                  */
4540                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4541                     (stcb == NULL) &&
4542                     (inp->auth_supported == 1)) {
4543                         /* save this chunk for later processing */
4544                         auth_skipped = 1;
4545                         auth_offset = *offset;
4546                         auth_len = ntohs(ch->chunk_length);
4547
4548                         /* (temporarily) move past this chunk */
4549                         *offset += SCTP_SIZE32(auth_len);
4550                         if (*offset >= length) {
4551                                 /* no more data left in the mbuf chain */
4552                                 *offset = length;
4553                                 if (locked_tcb) {
4554                                         SCTP_TCB_UNLOCK(locked_tcb);
4555                                 }
4556                                 return (NULL);
4557                         }
4558                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4559                             sizeof(struct sctp_chunkhdr), chunk_buf);
4560                 }
4561                 if (ch == NULL) {
4562                         /* Help */
4563                         *offset = length;
4564                         if (locked_tcb) {
4565                                 SCTP_TCB_UNLOCK(locked_tcb);
4566                         }
4567                         return (NULL);
4568                 }
4569                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4570                         goto process_control_chunks;
4571                 }
4572                 /*
4573                  * first check if it's an ASCONF with an unknown src addr we
4574                  * need to look inside to find the association
4575                  */
4576                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4577                         struct sctp_chunkhdr *asconf_ch = ch;
4578                         uint32_t asconf_offset = 0, asconf_len = 0;
4579
4580                         /* inp's refcount may be reduced */
4581                         SCTP_INP_INCR_REF(inp);
4582
4583                         asconf_offset = *offset;
4584                         do {
4585                                 asconf_len = ntohs(asconf_ch->chunk_length);
4586                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4587                                         break;
4588                                 stcb = sctp_findassociation_ep_asconf(m,
4589                                     *offset,
4590                                     dst,
4591                                     sh, &inp, netp, vrf_id);
4592                                 if (stcb != NULL)
4593                                         break;
4594                                 asconf_offset += SCTP_SIZE32(asconf_len);
4595                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4596                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4597                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4598                         if (stcb == NULL) {
4599                                 /*
4600                                  * reduce inp's refcount if not reduced in
4601                                  * sctp_findassociation_ep_asconf().
4602                                  */
4603                                 SCTP_INP_DECR_REF(inp);
4604                         } else {
4605                                 locked_tcb = stcb;
4606                         }
4607
4608                         /* now go back and verify any auth chunk to be sure */
4609                         if (auth_skipped && (stcb != NULL)) {
4610                                 struct sctp_auth_chunk *auth;
4611
4612                                 auth = (struct sctp_auth_chunk *)
4613                                     sctp_m_getptr(m, auth_offset,
4614                                     auth_len, chunk_buf);
4615                                 got_auth = 1;
4616                                 auth_skipped = 0;
4617                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4618                                     auth_offset)) {
4619                                         /* auth HMAC failed so dump it */
4620                                         *offset = length;
4621                                         if (locked_tcb) {
4622                                                 SCTP_TCB_UNLOCK(locked_tcb);
4623                                         }
4624                                         return (NULL);
4625                                 } else {
4626                                         /* remaining chunks are HMAC checked */
4627                                         stcb->asoc.authenticated = 1;
4628                                 }
4629                         }
4630                 }
4631                 if (stcb == NULL) {
4632                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4633                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4634                             msg);
4635                         /* no association, so it's out of the blue... */
4636                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4637                             mflowtype, mflowid, inp->fibnum,
4638                             vrf_id, port);
4639                         *offset = length;
4640                         if (locked_tcb) {
4641                                 SCTP_TCB_UNLOCK(locked_tcb);
4642                         }
4643                         return (NULL);
4644                 }
4645                 asoc = &stcb->asoc;
4646                 /* ABORT and SHUTDOWN can use either v_tag... */
4647                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4648                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4649                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4650                         /* Take the T-bit always into account. */
4651                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4652                             (vtag_in == asoc->my_vtag)) ||
4653                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4654                             (vtag_in == asoc->peer_vtag))) {
4655                                 /* this is valid */
4656                         } else {
4657                                 /* drop this packet... */
4658                                 SCTP_STAT_INCR(sctps_badvtag);
4659                                 if (locked_tcb) {
4660                                         SCTP_TCB_UNLOCK(locked_tcb);
4661                                 }
4662                                 return (NULL);
4663                         }
4664                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4665                         if (vtag_in != asoc->my_vtag) {
4666                                 /*
4667                                  * this could be a stale SHUTDOWN-ACK or the
4668                                  * peer never got the SHUTDOWN-COMPLETE and
4669                                  * is still hung; we have started a new asoc
4670                                  * but it won't complete until the shutdown
4671                                  * is completed
4672                                  */
4673                                 if (locked_tcb) {
4674                                         SCTP_TCB_UNLOCK(locked_tcb);
4675                                 }
4676                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4677                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4678                                     msg);
4679                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4680                                     sh, inp, op_err,
4681                                     mflowtype, mflowid, fibnum,
4682                                     vrf_id, port);
4683                                 return (NULL);
4684                         }
4685                 } else {
4686                         /* for all other chunks, vtag must match */
4687                         if (vtag_in != asoc->my_vtag) {
4688                                 /* invalid vtag... */
4689                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4690                                     "invalid vtag: %xh, expect %xh\n",
4691                                     vtag_in, asoc->my_vtag);
4692                                 SCTP_STAT_INCR(sctps_badvtag);
4693                                 if (locked_tcb) {
4694                                         SCTP_TCB_UNLOCK(locked_tcb);
4695                                 }
4696                                 *offset = length;
4697                                 return (NULL);
4698                         }
4699                 }
4700         }                       /* end if !SCTP_COOKIE_ECHO */
4701         /*
4702          * process all control chunks...
4703          */
4704         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4705             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4706             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4707             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4708                 /* implied cookie-ack.. we must have lost the ack */
4709                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4710                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4711                             stcb->asoc.overall_error_count,
4712                             0,
4713                             SCTP_FROM_SCTP_INPUT,
4714                             __LINE__);
4715                 }
4716                 stcb->asoc.overall_error_count = 0;
4717                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4718                     *netp);
4719         }
4720 process_control_chunks:
4721         while (IS_SCTP_CONTROL(ch)) {
4722                 /* validate chunk length */
4723                 chk_length = ntohs(ch->chunk_length);
4724                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4725                     ch->chunk_type, chk_length);
4726                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4727                 if (chk_length < sizeof(*ch) ||
4728                     (*offset + (int)chk_length) > length) {
4729                         *offset = length;
4730                         if (locked_tcb) {
4731                                 SCTP_TCB_UNLOCK(locked_tcb);
4732                         }
4733                         return (NULL);
4734                 }
4735                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4736                 /*
4737                  * INIT-ACK only gets the init ack "header" portion only
4738                  * because we don't have to process the peer's COOKIE. All
4739                  * others get a complete chunk.
4740                  */
4741                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4742                     (ch->chunk_type == SCTP_INITIATION)) {
4743                         /* get an init-ack chunk */
4744                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4745                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4746                         if (ch == NULL) {
4747                                 *offset = length;
4748                                 if (locked_tcb) {
4749                                         SCTP_TCB_UNLOCK(locked_tcb);
4750                                 }
4751                                 return (NULL);
4752                         }
4753                 } else {
4754                         /* For cookies and all other chunks. */
4755                         if (chk_length > sizeof(chunk_buf)) {
4756                                 /*
4757                                  * use just the size of the chunk buffer so
4758                                  * the front part of our chunks fit in
4759                                  * contiguous space up to the chunk buffer
4760                                  * size (508 bytes). For chunks that need to
4761                                  * get more than that they must use the
4762                                  * sctp_m_getptr() function or other means
4763                                  * (e.g. know how to parse mbuf chains).
4764                                  * Cookies do this already.
4765                                  */
4766                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4767                                     (sizeof(chunk_buf) - 4),
4768                                     chunk_buf);
4769                                 if (ch == NULL) {
4770                                         *offset = length;
4771                                         if (locked_tcb) {
4772                                                 SCTP_TCB_UNLOCK(locked_tcb);
4773                                         }
4774                                         return (NULL);
4775                                 }
4776                         } else {
4777                                 /* We can fit it all */
4778                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4779                                     chk_length, chunk_buf);
4780                                 if (ch == NULL) {
4781                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4782                                         *offset = length;
4783                                         if (locked_tcb) {
4784                                                 SCTP_TCB_UNLOCK(locked_tcb);
4785                                         }
4786                                         return (NULL);
4787                                 }
4788                         }
4789                 }
4790                 num_chunks++;
4791                 /* Save off the last place we got a control from */
4792                 if (stcb != NULL) {
4793                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4794                                 /*
4795                                  * allow last_control to be NULL if
4796                                  * ASCONF... ASCONF processing will find the
4797                                  * right net later
4798                                  */
4799                                 if ((netp != NULL) && (*netp != NULL))
4800                                         stcb->asoc.last_control_chunk_from = *netp;
4801                         }
4802                 }
4803 #ifdef SCTP_AUDITING_ENABLED
4804                 sctp_audit_log(0xB0, ch->chunk_type);
4805 #endif
4806
4807                 /* check to see if this chunk required auth, but isn't */
4808                 if ((stcb != NULL) &&
4809                     (stcb->asoc.auth_supported == 1) &&
4810                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4811                     !stcb->asoc.authenticated) {
4812                         /* "silently" ignore */
4813                         SCTP_STAT_INCR(sctps_recvauthmissing);
4814                         goto next_chunk;
4815                 }
4816                 switch (ch->chunk_type) {
4817                 case SCTP_INITIATION:
4818                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4819                         /* The INIT chunk must be the only chunk. */
4820                         if ((num_chunks > 1) ||
4821                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4822                                 /* RFC 4960 requires that no ABORT is sent */
4823                                 *offset = length;
4824                                 if (locked_tcb) {
4825                                         SCTP_TCB_UNLOCK(locked_tcb);
4826                                 }
4827                                 return (NULL);
4828                         }
4829                         /* Honor our resource limit. */
4830                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4831                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4832                                 sctp_abort_association(inp, stcb, m, iphlen,
4833                                     src, dst, sh, op_err,
4834                                     mflowtype, mflowid,
4835                                     vrf_id, port);
4836                                 *offset = length;
4837                                 return (NULL);
4838                         }
4839                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4840                             (struct sctp_init_chunk *)ch, inp,
4841                             stcb, &abort_no_unlock,
4842                             mflowtype, mflowid,
4843                             vrf_id, port);
4844                         *offset = length;
4845                         if ((!abort_no_unlock) && (locked_tcb)) {
4846                                 SCTP_TCB_UNLOCK(locked_tcb);
4847                         }
4848                         return (NULL);
4849                         break;
4850                 case SCTP_PAD_CHUNK:
4851                         break;
4852                 case SCTP_INITIATION_ACK:
4853                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4854                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4855                                 /* We are not interested anymore */
4856                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4857                                         ;
4858                                 } else {
4859                                         if (locked_tcb != stcb) {
4860                                                 /* Very unlikely */
4861                                                 SCTP_TCB_UNLOCK(locked_tcb);
4862                                         }
4863                                         *offset = length;
4864                                         if (stcb) {
4865 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4866                                                 so = SCTP_INP_SO(inp);
4867                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4868                                                 SCTP_TCB_UNLOCK(stcb);
4869                                                 SCTP_SOCKET_LOCK(so, 1);
4870                                                 SCTP_TCB_LOCK(stcb);
4871                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4872 #endif
4873                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4874                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4875 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4876                                                 SCTP_SOCKET_UNLOCK(so, 1);
4877 #endif
4878                                         }
4879                                         return (NULL);
4880                                 }
4881                         }
4882                         /* The INIT-ACK chunk must be the only chunk. */
4883                         if ((num_chunks > 1) ||
4884                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4885                                 *offset = length;
4886                                 if (locked_tcb) {
4887                                         SCTP_TCB_UNLOCK(locked_tcb);
4888                                 }
4889                                 return (NULL);
4890                         }
4891                         if ((netp) && (*netp)) {
4892                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4893                                     src, dst, sh,
4894                                     (struct sctp_init_ack_chunk *)ch,
4895                                     stcb, *netp,
4896                                     &abort_no_unlock,
4897                                     mflowtype, mflowid,
4898                                     vrf_id);
4899                         } else {
4900                                 ret = -1;
4901                         }
4902                         *offset = length;
4903                         if (abort_no_unlock) {
4904                                 return (NULL);
4905                         }
4906                         /*
4907                          * Special case, I must call the output routine to
4908                          * get the cookie echoed
4909                          */
4910                         if ((stcb != NULL) && (ret == 0)) {
4911                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4912                         }
4913                         if (locked_tcb) {
4914                                 SCTP_TCB_UNLOCK(locked_tcb);
4915                         }
4916                         return (NULL);
4917                         break;
4918                 case SCTP_SELECTIVE_ACK:
4919                         {
4920                                 struct sctp_sack_chunk *sack;
4921                                 int abort_now = 0;
4922                                 uint32_t a_rwnd, cum_ack;
4923                                 uint16_t num_seg, num_dup;
4924                                 uint8_t flags;
4925                                 int offset_seg, offset_dup;
4926
4927                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4928                                 SCTP_STAT_INCR(sctps_recvsacks);
4929                                 if (stcb == NULL) {
4930                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4931                                         break;
4932                                 }
4933                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4934                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4935                                         break;
4936                                 }
4937                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4938                                         /*-
4939                                          * If we have sent a shutdown-ack, we will pay no
4940                                          * attention to a sack sent in to us since
4941                                          * we don't care anymore.
4942                                          */
4943                                         break;
4944                                 }
4945                                 sack = (struct sctp_sack_chunk *)ch;
4946                                 flags = ch->chunk_flags;
4947                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4948                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4949                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4950                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4951                                 if (sizeof(struct sctp_sack_chunk) +
4952                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4953                                     num_dup * sizeof(uint32_t) != chk_length) {
4954                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4955                                         break;
4956                                 }
4957                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4958                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4959                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4960                                     cum_ack, num_seg, a_rwnd);
4961                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4962                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4963                                     (num_seg == 0) &&
4964                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4965                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4966                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4967                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4968                                     ) {
4969                                         /*
4970                                          * We have a SIMPLE sack having no
4971                                          * prior segments and data on sent
4972                                          * queue to be acked.. Use the
4973                                          * faster path sack processing. We
4974                                          * also allow window update sacks
4975                                          * with no missing segments to go
4976                                          * this way too.
4977                                          */
4978                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4979                                 } else {
4980                                         if (netp && *netp)
4981                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4982                                                     num_seg, 0, num_dup, &abort_now, flags,
4983                                                     cum_ack, a_rwnd, ecne_seen);
4984                                 }
4985                                 if (abort_now) {
4986                                         /* ABORT signal from sack processing */
4987                                         *offset = length;
4988                                         return (NULL);
4989                                 }
4990                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4991                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4992                                     (stcb->asoc.stream_queue_cnt == 0)) {
4993                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4994                                 }
4995                         }
4996                         break;
4997                         /*
4998                          * EY - nr_sack:  If the received chunk is an
4999                          * nr_sack chunk
5000                          */
5001                 case SCTP_NR_SELECTIVE_ACK:
5002                         {
5003                                 struct sctp_nr_sack_chunk *nr_sack;
5004                                 int abort_now = 0;
5005                                 uint32_t a_rwnd, cum_ack;
5006                                 uint16_t num_seg, num_nr_seg, num_dup;
5007                                 uint8_t flags;
5008                                 int offset_seg, offset_dup;
5009
5010                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
5011                                 SCTP_STAT_INCR(sctps_recvsacks);
5012                                 if (stcb == NULL) {
5013                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
5014                                         break;
5015                                 }
5016                                 if (stcb->asoc.nrsack_supported == 0) {
5017                                         goto unknown_chunk;
5018                                 }
5019                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5020                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
5021                                         break;
5022                                 }
5023                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5024                                         /*-
5025                                          * If we have sent a shutdown-ack, we will pay no
5026                                          * attention to a sack sent in to us since
5027                                          * we don't care anymore.
5028                                          */
5029                                         break;
5030                                 }
5031                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5032                                 flags = ch->chunk_flags;
5033                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5034                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5035                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5036                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5037                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
5038                                 if (sizeof(struct sctp_nr_sack_chunk) +
5039                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5040                                     num_dup * sizeof(uint32_t) != chk_length) {
5041                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5042                                         break;
5043                                 }
5044                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5045                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5046                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5047                                     cum_ack, num_seg, a_rwnd);
5048                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5049                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5050                                     (num_seg == 0) && (num_nr_seg == 0) &&
5051                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5052                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5053                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5054                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5055                                         /*
5056                                          * We have a SIMPLE sack having no
5057                                          * prior segments and data on sent
5058                                          * queue to be acked. Use the faster
5059                                          * path sack processing. We also
5060                                          * allow window update sacks with no
5061                                          * missing segments to go this way
5062                                          * too.
5063                                          */
5064                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5065                                             &abort_now, ecne_seen);
5066                                 } else {
5067                                         if (netp && *netp)
5068                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5069                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5070                                                     cum_ack, a_rwnd, ecne_seen);
5071                                 }
5072                                 if (abort_now) {
5073                                         /* ABORT signal from sack processing */
5074                                         *offset = length;
5075                                         return (NULL);
5076                                 }
5077                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5078                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5079                                     (stcb->asoc.stream_queue_cnt == 0)) {
5080                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5081                                 }
5082                         }
5083                         break;
5084
5085                 case SCTP_HEARTBEAT_REQUEST:
5086                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5087                         if ((stcb) && netp && *netp) {
5088                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5089                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5090                                     chk_length, *netp);
5091
5092                                 /* He's alive so give him credit */
5093                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5094                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5095                                             stcb->asoc.overall_error_count,
5096                                             0,
5097                                             SCTP_FROM_SCTP_INPUT,
5098                                             __LINE__);
5099                                 }
5100                                 stcb->asoc.overall_error_count = 0;
5101                         }
5102                         break;
5103                 case SCTP_HEARTBEAT_ACK:
5104                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5105                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5106                                 /* Its not ours */
5107                                 *offset = length;
5108                                 if (locked_tcb) {
5109                                         SCTP_TCB_UNLOCK(locked_tcb);
5110                                 }
5111                                 return (NULL);
5112                         }
5113                         /* He's alive so give him credit */
5114                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5115                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5116                                     stcb->asoc.overall_error_count,
5117                                     0,
5118                                     SCTP_FROM_SCTP_INPUT,
5119                                     __LINE__);
5120                         }
5121                         stcb->asoc.overall_error_count = 0;
5122                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5123                         if (netp && *netp)
5124                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5125                                     stcb, *netp);
5126                         break;
5127                 case SCTP_ABORT_ASSOCIATION:
5128                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5129                             (void *)stcb);
5130                         if ((stcb) && netp && *netp)
5131                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5132                                     stcb, *netp);
5133                         *offset = length;
5134                         return (NULL);
5135                         break;
5136                 case SCTP_SHUTDOWN:
5137                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5138                             (void *)stcb);
5139                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5140                                 *offset = length;
5141                                 if (locked_tcb) {
5142                                         SCTP_TCB_UNLOCK(locked_tcb);
5143                                 }
5144                                 return (NULL);
5145                         }
5146                         if (netp && *netp) {
5147                                 int abort_flag = 0;
5148
5149                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5150                                     stcb, *netp, &abort_flag);
5151                                 if (abort_flag) {
5152                                         *offset = length;
5153                                         return (NULL);
5154                                 }
5155                         }
5156                         break;
5157                 case SCTP_SHUTDOWN_ACK:
5158                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5159                         if ((stcb) && (netp) && (*netp))
5160                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5161                         *offset = length;
5162                         return (NULL);
5163                         break;
5164
5165                 case SCTP_OPERATION_ERROR:
5166                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5167                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5168                                 *offset = length;
5169                                 return (NULL);
5170                         }
5171                         break;
5172                 case SCTP_COOKIE_ECHO:
5173                         SCTPDBG(SCTP_DEBUG_INPUT3,
5174                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5175                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5176                                 ;
5177                         } else {
5178                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5179                                         /* We are not interested anymore */
5180                         abend:
5181                                         if (stcb) {
5182                                                 SCTP_TCB_UNLOCK(stcb);
5183                                         }
5184                                         *offset = length;
5185                                         return (NULL);
5186                                 }
5187                         }
5188                         /*
5189                          * First are we accepting? We do this again here
5190                          * since it is possible that a previous endpoint WAS
5191                          * listening responded to a INIT-ACK and then
5192                          * closed. We opened and bound.. and are now no
5193                          * longer listening.
5194                          */
5195
5196                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5197                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5198                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5199                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5200                                         sctp_abort_association(inp, stcb, m, iphlen,
5201                                             src, dst, sh, op_err,
5202                                             mflowtype, mflowid,
5203                                             vrf_id, port);
5204                                 }
5205                                 *offset = length;
5206                                 return (NULL);
5207                         } else {
5208                                 struct mbuf *ret_buf;
5209                                 struct sctp_inpcb *linp;
5210
5211                                 if (stcb) {
5212                                         linp = NULL;
5213                                 } else {
5214                                         linp = inp;
5215                                 }
5216
5217                                 if (linp) {
5218                                         SCTP_ASOC_CREATE_LOCK(linp);
5219                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5220                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5221                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5222                                                 goto abend;
5223                                         }
5224                                 }
5225                                 if (netp) {
5226                                         ret_buf =
5227                                             sctp_handle_cookie_echo(m, iphlen,
5228                                             *offset,
5229                                             src, dst,
5230                                             sh,
5231                                             (struct sctp_cookie_echo_chunk *)ch,
5232                                             &inp, &stcb, netp,
5233                                             auth_skipped,
5234                                             auth_offset,
5235                                             auth_len,
5236                                             &locked_tcb,
5237                                             mflowtype,
5238                                             mflowid,
5239                                             vrf_id,
5240                                             port);
5241                                 } else {
5242                                         ret_buf = NULL;
5243                                 }
5244                                 if (linp) {
5245                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5246                                 }
5247                                 if (ret_buf == NULL) {
5248                                         if (locked_tcb) {
5249                                                 SCTP_TCB_UNLOCK(locked_tcb);
5250                                         }
5251                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5252                                             "GAK, null buffer\n");
5253                                         *offset = length;
5254                                         return (NULL);
5255                                 }
5256                                 /* if AUTH skipped, see if it verified... */
5257                                 if (auth_skipped) {
5258                                         got_auth = 1;
5259                                         auth_skipped = 0;
5260                                 }
5261                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5262                                         /*
5263                                          * Restart the timer if we have
5264                                          * pending data
5265                                          */
5266                                         struct sctp_tmit_chunk *chk;
5267
5268                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5269                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5270                                 }
5271                         }
5272                         break;
5273                 case SCTP_COOKIE_ACK:
5274                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5275                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5276                                 if (locked_tcb) {
5277                                         SCTP_TCB_UNLOCK(locked_tcb);
5278                                 }
5279                                 return (NULL);
5280                         }
5281                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5282                                 /* We are not interested anymore */
5283                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5284                                         ;
5285                                 } else if (stcb) {
5286 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5287                                         so = SCTP_INP_SO(inp);
5288                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5289                                         SCTP_TCB_UNLOCK(stcb);
5290                                         SCTP_SOCKET_LOCK(so, 1);
5291                                         SCTP_TCB_LOCK(stcb);
5292                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5293 #endif
5294                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5295                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5296 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5297                                         SCTP_SOCKET_UNLOCK(so, 1);
5298 #endif
5299                                         *offset = length;
5300                                         return (NULL);
5301                                 }
5302                         }
5303                         /* He's alive so give him credit */
5304                         if ((stcb) && netp && *netp) {
5305                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5306                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5307                                             stcb->asoc.overall_error_count,
5308                                             0,
5309                                             SCTP_FROM_SCTP_INPUT,
5310                                             __LINE__);
5311                                 }
5312                                 stcb->asoc.overall_error_count = 0;
5313                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5314                         }
5315                         break;
5316                 case SCTP_ECN_ECHO:
5317                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5318                         /* He's alive so give him credit */
5319                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5320                                 /* Its not ours */
5321                                 if (locked_tcb) {
5322                                         SCTP_TCB_UNLOCK(locked_tcb);
5323                                 }
5324                                 *offset = length;
5325                                 return (NULL);
5326                         }
5327                         if (stcb) {
5328                                 if (stcb->asoc.ecn_supported == 0) {
5329                                         goto unknown_chunk;
5330                                 }
5331                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5332                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5333                                             stcb->asoc.overall_error_count,
5334                                             0,
5335                                             SCTP_FROM_SCTP_INPUT,
5336                                             __LINE__);
5337                                 }
5338                                 stcb->asoc.overall_error_count = 0;
5339                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5340                                     stcb);
5341                                 ecne_seen = 1;
5342                         }
5343                         break;
5344                 case SCTP_ECN_CWR:
5345                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5346                         /* He's alive so give him credit */
5347                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5348                                 /* Its not ours */
5349                                 if (locked_tcb) {
5350                                         SCTP_TCB_UNLOCK(locked_tcb);
5351                                 }
5352                                 *offset = length;
5353                                 return (NULL);
5354                         }
5355                         if (stcb) {
5356                                 if (stcb->asoc.ecn_supported == 0) {
5357                                         goto unknown_chunk;
5358                                 }
5359                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5360                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5361                                             stcb->asoc.overall_error_count,
5362                                             0,
5363                                             SCTP_FROM_SCTP_INPUT,
5364                                             __LINE__);
5365                                 }
5366                                 stcb->asoc.overall_error_count = 0;
5367                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5368                         }
5369                         break;
5370                 case SCTP_SHUTDOWN_COMPLETE:
5371                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5372                         /* must be first and only chunk */
5373                         if ((num_chunks > 1) ||
5374                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5375                                 *offset = length;
5376                                 if (locked_tcb) {
5377                                         SCTP_TCB_UNLOCK(locked_tcb);
5378                                 }
5379                                 return (NULL);
5380                         }
5381                         if ((stcb) && netp && *netp) {
5382                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5383                                     stcb, *netp);
5384                         }
5385                         *offset = length;
5386                         return (NULL);
5387                         break;
5388                 case SCTP_ASCONF:
5389                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5390                         /* He's alive so give him credit */
5391                         if (stcb) {
5392                                 if (stcb->asoc.asconf_supported == 0) {
5393                                         goto unknown_chunk;
5394                                 }
5395                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5396                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5397                                             stcb->asoc.overall_error_count,
5398                                             0,
5399                                             SCTP_FROM_SCTP_INPUT,
5400                                             __LINE__);
5401                                 }
5402                                 stcb->asoc.overall_error_count = 0;
5403                                 sctp_handle_asconf(m, *offset, src,
5404                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5405                                 asconf_cnt++;
5406                         }
5407                         break;
5408                 case SCTP_ASCONF_ACK:
5409                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5410                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5411                                 /* Its not ours */
5412                                 if (locked_tcb) {
5413                                         SCTP_TCB_UNLOCK(locked_tcb);
5414                                 }
5415                                 *offset = length;
5416                                 return (NULL);
5417                         }
5418                         if ((stcb) && netp && *netp) {
5419                                 if (stcb->asoc.asconf_supported == 0) {
5420                                         goto unknown_chunk;
5421                                 }
5422                                 /* He's alive so give him credit */
5423                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5424                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5425                                             stcb->asoc.overall_error_count,
5426                                             0,
5427                                             SCTP_FROM_SCTP_INPUT,
5428                                             __LINE__);
5429                                 }
5430                                 stcb->asoc.overall_error_count = 0;
5431                                 sctp_handle_asconf_ack(m, *offset,
5432                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5433                                 if (abort_no_unlock)
5434                                         return (NULL);
5435                         }
5436                         break;
5437                 case SCTP_FORWARD_CUM_TSN:
5438                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5439                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5440                                 /* Its not ours */
5441                                 if (locked_tcb) {
5442                                         SCTP_TCB_UNLOCK(locked_tcb);
5443                                 }
5444                                 *offset = length;
5445                                 return (NULL);
5446                         }
5447                         /* He's alive so give him credit */
5448                         if (stcb) {
5449                                 int abort_flag = 0;
5450
5451                                 if (stcb->asoc.prsctp_supported == 0) {
5452                                         goto unknown_chunk;
5453                                 }
5454                                 stcb->asoc.overall_error_count = 0;
5455                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5456                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5457                                             stcb->asoc.overall_error_count,
5458                                             0,
5459                                             SCTP_FROM_SCTP_INPUT,
5460                                             __LINE__);
5461                                 }
5462                                 *fwd_tsn_seen = 1;
5463                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5464                                         /* We are not interested anymore */
5465 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5466                                         so = SCTP_INP_SO(inp);
5467                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5468                                         SCTP_TCB_UNLOCK(stcb);
5469                                         SCTP_SOCKET_LOCK(so, 1);
5470                                         SCTP_TCB_LOCK(stcb);
5471                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5472 #endif
5473                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5474                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5475 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5476                                         SCTP_SOCKET_UNLOCK(so, 1);
5477 #endif
5478                                         *offset = length;
5479                                         return (NULL);
5480                                 }
5481                                 sctp_handle_forward_tsn(stcb,
5482                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5483                                 if (abort_flag) {
5484                                         *offset = length;
5485                                         return (NULL);
5486                                 } else {
5487                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5488                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5489                                                     stcb->asoc.overall_error_count,
5490                                                     0,
5491                                                     SCTP_FROM_SCTP_INPUT,
5492                                                     __LINE__);
5493                                         }
5494                                         stcb->asoc.overall_error_count = 0;
5495                                 }
5496
5497                         }
5498                         break;
5499                 case SCTP_STREAM_RESET:
5500                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5501                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5502                                 /* Its not ours */
5503                                 if (locked_tcb) {
5504                                         SCTP_TCB_UNLOCK(locked_tcb);
5505                                 }
5506                                 *offset = length;
5507                                 return (NULL);
5508                         }
5509                         if (stcb->asoc.reconfig_supported == 0) {
5510                                 goto unknown_chunk;
5511                         }
5512                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5513                                 /* stop processing */
5514                                 *offset = length;
5515                                 return (NULL);
5516                         }
5517                         break;
5518                 case SCTP_PACKET_DROPPED:
5519                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5520                         /* re-get it all please */
5521                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5522                                 /* Its not ours */
5523                                 if (locked_tcb) {
5524                                         SCTP_TCB_UNLOCK(locked_tcb);
5525                                 }
5526                                 *offset = length;
5527                                 return (NULL);
5528                         }
5529                         if (ch && (stcb) && netp && (*netp)) {
5530                                 if (stcb->asoc.pktdrop_supported == 0) {
5531                                         goto unknown_chunk;
5532                                 }
5533                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5534                                     stcb, *netp,
5535                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5536
5537                         }
5538                         break;
5539                 case SCTP_AUTHENTICATION:
5540                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5541                         if (stcb == NULL) {
5542                                 /* save the first AUTH for later processing */
5543                                 if (auth_skipped == 0) {
5544                                         auth_offset = *offset;
5545                                         auth_len = chk_length;
5546                                         auth_skipped = 1;
5547                                 }
5548                                 /* skip this chunk (temporarily) */
5549                                 goto next_chunk;
5550                         }
5551                         if (stcb->asoc.auth_supported == 0) {
5552                                 goto unknown_chunk;
5553                         }
5554                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5555                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5556                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5557                                 /* Its not ours */
5558                                 if (locked_tcb) {
5559                                         SCTP_TCB_UNLOCK(locked_tcb);
5560                                 }
5561                                 *offset = length;
5562                                 return (NULL);
5563                         }
5564                         if (got_auth == 1) {
5565                                 /* skip this chunk... it's already auth'd */
5566                                 goto next_chunk;
5567                         }
5568                         got_auth = 1;
5569                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5570                             m, *offset)) {
5571                                 /* auth HMAC failed so dump the packet */
5572                                 *offset = length;
5573                                 return (stcb);
5574                         } else {
5575                                 /* remaining chunks are HMAC checked */
5576                                 stcb->asoc.authenticated = 1;
5577                         }
5578                         break;
5579
5580                 default:
5581         unknown_chunk:
5582                         /* it's an unknown chunk! */
5583                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5584                                 struct sctp_gen_error_cause *cause;
5585                                 int len;
5586
5587                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5588                                     0, M_NOWAIT, 1, MT_DATA);
5589                                 if (op_err != NULL) {
5590                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5591                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5592                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5593                                         cause->length = htons(len + sizeof(struct sctp_gen_error_cause));
5594                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5595                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5596                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5597 #ifdef SCTP_MBUF_LOGGING
5598                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5599                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5600                                                 }
5601 #endif
5602                                                 sctp_queue_op_err(stcb, op_err);
5603                                         } else {
5604                                                 sctp_m_freem(op_err);
5605                                         }
5606                                 }
5607                         }
5608                         if ((ch->chunk_type & 0x80) == 0) {
5609                                 /* discard this packet */
5610                                 *offset = length;
5611                                 return (stcb);
5612                         }       /* else skip this bad chunk and continue... */
5613                         break;
5614                 }               /* switch (ch->chunk_type) */
5615
5616
5617 next_chunk:
5618                 /* get the next chunk */
5619                 *offset += SCTP_SIZE32(chk_length);
5620                 if (*offset >= length) {
5621                         /* no more data left in the mbuf chain */
5622                         break;
5623                 }
5624                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5625                     sizeof(struct sctp_chunkhdr), chunk_buf);
5626                 if (ch == NULL) {
5627                         if (locked_tcb) {
5628                                 SCTP_TCB_UNLOCK(locked_tcb);
5629                         }
5630                         *offset = length;
5631                         return (NULL);
5632                 }
5633         }                       /* while */
5634
5635         if (asconf_cnt > 0 && stcb != NULL) {
5636                 sctp_send_asconf_ack(stcb);
5637         }
5638         return (stcb);
5639 }
5640
5641
5642 #ifdef INVARIANTS
5643 #ifdef __GNUC__
5644 __attribute__((noinline))
5645 #endif
5646         void
5647              sctp_validate_no_locks(struct sctp_inpcb *inp)
5648 {
5649         struct sctp_tcb *lstcb;
5650
5651         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5652                 if (mtx_owned(&lstcb->tcb_mtx)) {
5653                         panic("Own lock on stcb at return from input");
5654                 }
5655         }
5656         if (mtx_owned(&inp->inp_create_mtx)) {
5657                 panic("Own create lock on inp");
5658         }
5659         if (mtx_owned(&inp->inp_mtx)) {
5660                 panic("Own inp lock on inp");
5661         }
5662 }
5663
5664 #endif
5665
5666 /*
5667  * common input chunk processing (v4 and v6)
5668  */
5669 void
5670 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5671     struct sockaddr *src, struct sockaddr *dst,
5672     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5673 #if !defined(SCTP_WITH_NO_CSUM)
5674     uint8_t compute_crc,
5675 #endif
5676     uint8_t ecn_bits,
5677     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5678     uint32_t vrf_id, uint16_t port)
5679 {
5680         uint32_t high_tsn;
5681         int fwd_tsn_seen = 0, data_processed = 0;
5682         struct mbuf *m = *mm, *op_err;
5683         char msg[SCTP_DIAG_INFO_LEN];
5684         int un_sent;
5685         int cnt_ctrl_ready = 0;
5686         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5687         struct sctp_tcb *stcb = NULL;
5688         struct sctp_nets *net = NULL;
5689
5690         SCTP_STAT_INCR(sctps_recvdatagrams);
5691 #ifdef SCTP_AUDITING_ENABLED
5692         sctp_audit_log(0xE0, 1);
5693         sctp_auditing(0, inp, stcb, net);
5694 #endif
5695 #if !defined(SCTP_WITH_NO_CSUM)
5696         if (compute_crc != 0) {
5697                 uint32_t check, calc_check;
5698
5699                 check = sh->checksum;
5700                 sh->checksum = 0;
5701                 calc_check = sctp_calculate_cksum(m, iphlen);
5702                 sh->checksum = check;
5703                 if (calc_check != check) {
5704                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5705                             calc_check, check, (void *)m, length, iphlen);
5706                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5707                             sh, ch, &inp, &net, vrf_id);
5708 #if defined(INET) || defined(INET6)
5709                         if ((net != NULL) && (port != 0)) {
5710                                 if (net->port == 0) {
5711                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5712                                 }
5713                                 net->port = port;
5714                         }
5715 #endif
5716                         if (net != NULL) {
5717                                 net->flowtype = mflowtype;
5718                                 net->flowid = mflowid;
5719                         }
5720                         if ((inp != NULL) && (stcb != NULL)) {
5721                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5722                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5723                         } else if ((inp != NULL) && (stcb == NULL)) {
5724                                 inp_decr = inp;
5725                         }
5726                         SCTP_STAT_INCR(sctps_badsum);
5727                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5728                         goto out;
5729                 }
5730         }
5731 #endif
5732         /* Destination port of 0 is illegal, based on RFC4960. */
5733         if (sh->dest_port == 0) {
5734                 SCTP_STAT_INCR(sctps_hdrops);
5735                 goto out;
5736         }
5737         stcb = sctp_findassociation_addr(m, offset, src, dst,
5738             sh, ch, &inp, &net, vrf_id);
5739 #if defined(INET) || defined(INET6)
5740         if ((net != NULL) && (port != 0)) {
5741                 if (net->port == 0) {
5742                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5743                 }
5744                 net->port = port;
5745         }
5746 #endif
5747         if (net != NULL) {
5748                 net->flowtype = mflowtype;
5749                 net->flowid = mflowid;
5750         }
5751         if (inp == NULL) {
5752                 SCTP_STAT_INCR(sctps_noport);
5753                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5754                         goto out;
5755                 }
5756                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5757                         sctp_send_shutdown_complete2(src, dst, sh,
5758                             mflowtype, mflowid, fibnum,
5759                             vrf_id, port);
5760                         goto out;
5761                 }
5762                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5763                         goto out;
5764                 }
5765                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5766                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5767                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5768                             (ch->chunk_type != SCTP_INIT))) {
5769                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5770                                     "Out of the blue");
5771                                 sctp_send_abort(m, iphlen, src, dst,
5772                                     sh, 0, op_err,
5773                                     mflowtype, mflowid, fibnum,
5774                                     vrf_id, port);
5775                         }
5776                 }
5777                 goto out;
5778         } else if (stcb == NULL) {
5779                 inp_decr = inp;
5780         }
5781 #ifdef IPSEC
5782         /*-
5783          * I very much doubt any of the IPSEC stuff will work but I have no
5784          * idea, so I will leave it in place.
5785          */
5786         if (inp != NULL) {
5787                 switch (dst->sa_family) {
5788 #ifdef INET
5789                 case AF_INET:
5790                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5791                                 IPSECSTAT_INC(ips_in_polvio);
5792                                 SCTP_STAT_INCR(sctps_hdrops);
5793                                 goto out;
5794                         }
5795                         break;
5796 #endif
5797 #ifdef INET6
5798                 case AF_INET6:
5799                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5800                                 IPSEC6STAT_INC(ips_in_polvio);
5801                                 SCTP_STAT_INCR(sctps_hdrops);
5802                                 goto out;
5803                         }
5804                         break;
5805 #endif
5806                 default:
5807                         break;
5808                 }
5809         }
5810 #endif
5811         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5812             (void *)m, iphlen, offset, length, (void *)stcb);
5813         if (stcb) {
5814                 /* always clear this before beginning a packet */
5815                 stcb->asoc.authenticated = 0;
5816                 stcb->asoc.seen_a_sack_this_pkt = 0;
5817                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5818                     (void *)stcb, stcb->asoc.state);
5819
5820                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5821                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5822                         /*-
5823                          * If we hit here, we had a ref count
5824                          * up when the assoc was aborted and the
5825                          * timer is clearing out the assoc, we should
5826                          * NOT respond to any packet.. its OOTB.
5827                          */
5828                         SCTP_TCB_UNLOCK(stcb);
5829                         stcb = NULL;
5830                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5831                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5832                             msg);
5833                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5834                             mflowtype, mflowid, inp->fibnum,
5835                             vrf_id, port);
5836                         goto out;
5837                 }
5838         }
5839         if (IS_SCTP_CONTROL(ch)) {
5840                 /* process the control portion of the SCTP packet */
5841                 /* sa_ignore NO_NULL_CHK */
5842                 stcb = sctp_process_control(m, iphlen, &offset, length,
5843                     src, dst, sh, ch,
5844                     inp, stcb, &net, &fwd_tsn_seen,
5845                     mflowtype, mflowid, fibnum,
5846                     vrf_id, port);
5847                 if (stcb) {
5848                         /*
5849                          * This covers us if the cookie-echo was there and
5850                          * it changes our INP.
5851                          */
5852                         inp = stcb->sctp_ep;
5853 #if defined(INET) || defined(INET6)
5854                         if ((net != NULL) && (port != 0)) {
5855                                 if (net->port == 0) {
5856                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5857                                 }
5858                                 net->port = port;
5859                         }
5860 #endif
5861                 }
5862         } else {
5863                 /*
5864                  * no control chunks, so pre-process DATA chunks (these
5865                  * checks are taken care of by control processing)
5866                  */
5867
5868                 /*
5869                  * if DATA only packet, and auth is required, then punt...
5870                  * can't have authenticated without any AUTH (control)
5871                  * chunks
5872                  */
5873                 if ((stcb != NULL) &&
5874                     (stcb->asoc.auth_supported == 1) &&
5875                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5876                         /* "silently" ignore */
5877                         SCTP_STAT_INCR(sctps_recvauthmissing);
5878                         goto out;
5879                 }
5880                 if (stcb == NULL) {
5881                         /* out of the blue DATA chunk */
5882                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5883                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5884                             msg);
5885                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5886                             mflowtype, mflowid, fibnum,
5887                             vrf_id, port);
5888                         goto out;
5889                 }
5890                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5891                         /* v_tag mismatch! */
5892                         SCTP_STAT_INCR(sctps_badvtag);
5893                         goto out;
5894                 }
5895         }
5896
5897         if (stcb == NULL) {
5898                 /*
5899                  * no valid TCB for this packet, or we found it's a bad
5900                  * packet while processing control, or we're done with this
5901                  * packet (done or skip rest of data), so we drop it...
5902                  */
5903                 goto out;
5904         }
5905         /*
5906          * DATA chunk processing
5907          */
5908         /* plow through the data chunks while length > offset */
5909
5910         /*
5911          * Rest should be DATA only.  Check authentication state if AUTH for
5912          * DATA is required.
5913          */
5914         if ((length > offset) &&
5915             (stcb != NULL) &&
5916             (stcb->asoc.auth_supported == 1) &&
5917             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5918             !stcb->asoc.authenticated) {
5919                 /* "silently" ignore */
5920                 SCTP_STAT_INCR(sctps_recvauthmissing);
5921                 SCTPDBG(SCTP_DEBUG_AUTH1,
5922                     "Data chunk requires AUTH, skipped\n");
5923                 goto trigger_send;
5924         }
5925         if (length > offset) {
5926                 int retval;
5927
5928                 /*
5929                  * First check to make sure our state is correct. We would
5930                  * not get here unless we really did have a tag, so we don't
5931                  * abort if this happens, just dump the chunk silently.
5932                  */
5933                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5934                 case SCTP_STATE_COOKIE_ECHOED:
5935                         /*
5936                          * we consider data with valid tags in this state
5937                          * shows us the cookie-ack was lost. Imply it was
5938                          * there.
5939                          */
5940                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5941                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5942                                     stcb->asoc.overall_error_count,
5943                                     0,
5944                                     SCTP_FROM_SCTP_INPUT,
5945                                     __LINE__);
5946                         }
5947                         stcb->asoc.overall_error_count = 0;
5948                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5949                         break;
5950                 case SCTP_STATE_COOKIE_WAIT:
5951                         /*
5952                          * We consider OOTB any data sent during asoc setup.
5953                          */
5954                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5955                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5956                             msg);
5957                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5958                             mflowtype, mflowid, inp->fibnum,
5959                             vrf_id, port);
5960                         goto out;
5961                         /* sa_ignore NOTREACHED */
5962                         break;
5963                 case SCTP_STATE_EMPTY:  /* should not happen */
5964                 case SCTP_STATE_INUSE:  /* should not happen */
5965                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5966                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5967                 default:
5968                         goto out;
5969                         /* sa_ignore NOTREACHED */
5970                         break;
5971                 case SCTP_STATE_OPEN:
5972                 case SCTP_STATE_SHUTDOWN_SENT:
5973                         break;
5974                 }
5975                 /* plow through the data chunks while length > offset */
5976                 retval = sctp_process_data(mm, iphlen, &offset, length,
5977                     inp, stcb, net, &high_tsn);
5978                 if (retval == 2) {
5979                         /*
5980                          * The association aborted, NO UNLOCK needed since
5981                          * the association is destroyed.
5982                          */
5983                         stcb = NULL;
5984                         goto out;
5985                 }
5986                 data_processed = 1;
5987                 /*
5988                  * Anything important needs to have been m_copy'ed in
5989                  * process_data
5990                  */
5991         }
5992         /* take care of ecn */
5993         if ((data_processed == 1) &&
5994             (stcb->asoc.ecn_supported == 1) &&
5995             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5996                 /* Yep, we need to add a ECNE */
5997                 sctp_send_ecn_echo(stcb, net, high_tsn);
5998         }
5999         if ((data_processed == 0) && (fwd_tsn_seen)) {
6000                 int was_a_gap;
6001                 uint32_t highest_tsn;
6002
6003                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
6004                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
6005                 } else {
6006                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
6007                 }
6008                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
6009                 stcb->asoc.send_sack = 1;
6010                 sctp_sack_check(stcb, was_a_gap);
6011         } else if (fwd_tsn_seen) {
6012                 stcb->asoc.send_sack = 1;
6013         }
6014         /* trigger send of any chunks in queue... */
6015 trigger_send:
6016 #ifdef SCTP_AUDITING_ENABLED
6017         sctp_audit_log(0xE0, 2);
6018         sctp_auditing(1, inp, stcb, net);
6019 #endif
6020         SCTPDBG(SCTP_DEBUG_INPUT1,
6021             "Check for chunk output prw:%d tqe:%d tf=%d\n",
6022             stcb->asoc.peers_rwnd,
6023             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
6024             stcb->asoc.total_flight);
6025         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
6026         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
6027                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
6028         }
6029         if (cnt_ctrl_ready || stcb->asoc.trigger_reset ||
6030             ((un_sent) &&
6031             (stcb->asoc.peers_rwnd > 0 ||
6032             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
6033                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
6034                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
6035                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6036         }
6037 #ifdef SCTP_AUDITING_ENABLED
6038         sctp_audit_log(0xE0, 3);
6039         sctp_auditing(2, inp, stcb, net);
6040 #endif
6041 out:
6042         if (stcb != NULL) {
6043                 SCTP_TCB_UNLOCK(stcb);
6044         }
6045         if (inp_decr != NULL) {
6046                 /* reduce ref-count */
6047                 SCTP_INP_WLOCK(inp_decr);
6048                 SCTP_INP_DECR_REF(inp_decr);
6049                 SCTP_INP_WUNLOCK(inp_decr);
6050         }
6051 #ifdef INVARIANTS
6052         if (inp != NULL) {
6053                 sctp_validate_no_locks(inp);
6054         }
6055 #endif
6056         return;
6057 }
6058
6059 #if 0
6060 static void
6061 sctp_print_mbuf_chain(struct mbuf *m)
6062 {
6063         for (; m; m = SCTP_BUF_NEXT(m)) {
6064                 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
6065                 if (SCTP_BUF_IS_EXTENDED(m))
6066                         SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
6067         }
6068 }
6069
6070 #endif
6071
6072 #ifdef INET
6073 void
6074 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6075 {
6076         struct mbuf *m;
6077         int iphlen;
6078         uint32_t vrf_id = 0;
6079         uint8_t ecn_bits;
6080         struct sockaddr_in src, dst;
6081         struct ip *ip;
6082         struct sctphdr *sh;
6083         struct sctp_chunkhdr *ch;
6084         int length, offset;
6085
6086 #if !defined(SCTP_WITH_NO_CSUM)
6087         uint8_t compute_crc;
6088
6089 #endif
6090         uint32_t mflowid;
6091         uint8_t mflowtype;
6092         uint16_t fibnum;
6093
6094         iphlen = off;
6095         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6096                 SCTP_RELEASE_PKT(i_pak);
6097                 return;
6098         }
6099         m = SCTP_HEADER_TO_CHAIN(i_pak);
6100 #ifdef SCTP_MBUF_LOGGING
6101         /* Log in any input mbufs */
6102         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6103                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6104         }
6105 #endif
6106 #ifdef SCTP_PACKET_LOGGING
6107         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6108                 sctp_packet_log(m);
6109         }
6110 #endif
6111         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6112             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6113             m->m_pkthdr.len,
6114             if_name(m->m_pkthdr.rcvif),
6115             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6116         mflowid = m->m_pkthdr.flowid;
6117         mflowtype = M_HASHTYPE_GET(m);
6118         fibnum = M_GETFIB(m);
6119         SCTP_STAT_INCR(sctps_recvpackets);
6120         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6121         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6122         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6123         if (SCTP_BUF_LEN(m) < offset) {
6124                 if ((m = m_pullup(m, offset)) == NULL) {
6125                         SCTP_STAT_INCR(sctps_hdrops);
6126                         return;
6127                 }
6128         }
6129         ip = mtod(m, struct ip *);
6130         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6131         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6132         offset -= sizeof(struct sctp_chunkhdr);
6133         memset(&src, 0, sizeof(struct sockaddr_in));
6134         src.sin_family = AF_INET;
6135         src.sin_len = sizeof(struct sockaddr_in);
6136         src.sin_port = sh->src_port;
6137         src.sin_addr = ip->ip_src;
6138         memset(&dst, 0, sizeof(struct sockaddr_in));
6139         dst.sin_family = AF_INET;
6140         dst.sin_len = sizeof(struct sockaddr_in);
6141         dst.sin_port = sh->dest_port;
6142         dst.sin_addr = ip->ip_dst;
6143         length = ntohs(ip->ip_len);
6144         /* Validate mbuf chain length with IP payload length. */
6145         if (SCTP_HEADER_LEN(m) != length) {
6146                 SCTPDBG(SCTP_DEBUG_INPUT1,
6147                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6148                 SCTP_STAT_INCR(sctps_hdrops);
6149                 goto out;
6150         }
6151         /* SCTP does not allow broadcasts or multicasts */
6152         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6153                 goto out;
6154         }
6155         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6156                 goto out;
6157         }
6158         ecn_bits = ip->ip_tos;
6159 #if defined(SCTP_WITH_NO_CSUM)
6160         SCTP_STAT_INCR(sctps_recvnocrc);
6161 #else
6162         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6163                 SCTP_STAT_INCR(sctps_recvhwcrc);
6164                 compute_crc = 0;
6165         } else {
6166                 SCTP_STAT_INCR(sctps_recvswcrc);
6167                 compute_crc = 1;
6168         }
6169 #endif
6170         sctp_common_input_processing(&m, iphlen, offset, length,
6171             (struct sockaddr *)&src,
6172             (struct sockaddr *)&dst,
6173             sh, ch,
6174 #if !defined(SCTP_WITH_NO_CSUM)
6175             compute_crc,
6176 #endif
6177             ecn_bits,
6178             mflowtype, mflowid, fibnum,
6179             vrf_id, port);
6180 out:
6181         if (m) {
6182                 sctp_m_freem(m);
6183         }
6184         return;
6185 }
6186
6187 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6188 extern int *sctp_cpuarry;
6189
6190 #endif
6191
6192 void
6193 sctp_input(struct mbuf *m, int off)
6194 {
6195 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6196         struct ip *ip;
6197         struct sctphdr *sh;
6198         int offset;
6199         int cpu_to_use;
6200         uint32_t flowid, tag;
6201
6202         if (mp_ncpus > 1) {
6203                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6204                         flowid = m->m_pkthdr.flowid;
6205                 } else {
6206                         /*
6207                          * No flow id built by lower layers fix it so we
6208                          * create one.
6209                          */
6210                         offset = off + sizeof(struct sctphdr);
6211                         if (SCTP_BUF_LEN(m) < offset) {
6212                                 if ((m = m_pullup(m, offset)) == NULL) {
6213                                         SCTP_STAT_INCR(sctps_hdrops);
6214                                         return;
6215                                 }
6216                         }
6217                         ip = mtod(m, struct ip *);
6218                         sh = (struct sctphdr *)((caddr_t)ip + off);
6219                         tag = htonl(sh->v_tag);
6220                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6221                         m->m_pkthdr.flowid = flowid;
6222                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6223                 }
6224                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6225                 sctp_queue_to_mcore(m, off, cpu_to_use);
6226                 return;
6227         }
6228 #endif
6229         sctp_input_with_port(m, off, 0);
6230 }
6231
6232 #endif