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
 525         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 526         if (retval < 0) {
 527                 /*
 528                  * No cookie, we probably should send a op error. But in any
 529                  * case if there is no cookie in the INIT-ACK, we can
 530                  * abandon the peer, its broke.
 531                  */
 532                 if (retval == -3) {
 533                         uint16_t len;
 534
 535                         len = (uint16_t) (sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 536                         /* We abort with an error of missing mandatory param */
 537                         op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 538                         if (op_err != NULL) {
 539                                 struct sctp_error_missing_param *cause;
 540
 541                                 SCTP_BUF_LEN(op_err) = len;
 542                                 cause = mtod(op_err, struct sctp_error_missing_param *);
 543                                 /* Subtract the reserved param */
 544                                 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 545                                 cause->cause.length = htons(len);
 546                                 cause->num_missing_params = htonl(1);
 547                                 cause->type[0] = htons(SCTP_STATE_COOKIE);
 548                         }
 549                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 550                             src, dst, sh, op_err,
 551                             mflowtype, mflowid,
 552                             vrf_id, net->port);
 553                         *abort_no_unlock = 1;
 554                 }
 555                 return (retval);
 556         }
 557         return (0);
 558 }
 559
 560 static void
 561 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 562     struct sctp_tcb *stcb, struct sctp_nets *net)
 563 {
 564         union sctp_sockstore store;
 565         struct sctp_nets *r_net, *f_net;
 566         struct timeval tv;
 567         int req_prim = 0;
 568         uint16_t old_error_counter;
 569
 570         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 571                 /* Invalid length */
 572                 return;
 573         }
 574         memset(&store, 0, sizeof(store));
 575         switch (cp->heartbeat.hb_info.addr_family) {
 576 #ifdef INET
 577         case AF_INET:
 578                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 579                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 580                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 581                         store.sin.sin_port = stcb->rport;
 582                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 583                             sizeof(store.sin.sin_addr));
 584                 } else {
 585                         return;
 586                 }
 587                 break;
 588 #endif
 589 #ifdef INET6
 590         case AF_INET6:
 591                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 592                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 593                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 594                         store.sin6.sin6_port = stcb->rport;
 595                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 596                 } else {
 597                         return;
 598                 }
 599                 break;
 600 #endif
 601         default:
 602                 return;
 603         }
 604         r_net = sctp_findnet(stcb, &store.sa);
 605         if (r_net == NULL) {
 606                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 607                 return;
 608         }
 609         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 610             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 611             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 612                 /*
 613                  * If the its a HB and it's random value is correct when can
 614                  * confirm the destination.
 615                  */
 616                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 617                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 618                         stcb->asoc.primary_destination = r_net;
 619                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 620                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 621                         if (f_net != r_net) {
 622                                 /*
 623                                  * first one on the list is NOT the primary
 624                                  * sctp_cmpaddr() is much more efficent if
 625                                  * the primary is the first on the list,
 626                                  * make it so.
 627                                  */
 628                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 629                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 630                         }
 631                         req_prim = 1;
 632                 }
 633                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 634                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 635                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 636                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 637                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 638         }
 639         old_error_counter = r_net->error_count;
 640         r_net->error_count = 0;
 641         r_net->hb_responded = 1;
 642         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 643         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 644         /* Now lets do a RTO with this */
 645         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 646             SCTP_RTT_FROM_NON_DATA);
 647         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 648                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 649                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 650                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 651         }
 652         if (r_net->dest_state & SCTP_ADDR_PF) {
 653                 r_net->dest_state &= ~SCTP_ADDR_PF;
 654                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 655         }
 656         if (old_error_counter > 0) {
 657                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 658                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 659                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 660         }
 661         if (r_net == stcb->asoc.primary_destination) {
 662                 if (stcb->asoc.alternate) {
 663                         /* release the alternate, primary is good */
 664                         sctp_free_remote_addr(stcb->asoc.alternate);
 665                         stcb->asoc.alternate = NULL;
 666                 }
 667         }
 668         /* Mobility adaptation */
 669         if (req_prim) {
 670                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 671                     SCTP_MOBILITY_BASE) ||
 672                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 673                     SCTP_MOBILITY_FASTHANDOFF)) &&
 674                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 675                     SCTP_MOBILITY_PRIM_DELETED)) {
 676
 677                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 678                             stcb->sctp_ep, stcb, NULL,
 679                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 680                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 681                             SCTP_MOBILITY_FASTHANDOFF)) {
 682                                 sctp_assoc_immediate_retrans(stcb,
 683                                     stcb->asoc.primary_destination);
 684                         }
 685                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 686                             SCTP_MOBILITY_BASE)) {
 687                                 sctp_move_chunks_from_net(stcb,
 688                                     stcb->asoc.deleted_primary);
 689                         }
 690                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 691                             stcb->asoc.deleted_primary);
 692                 }
 693         }
 694 }
 695
 696 static int
 697 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 698 {
 699         /*
 700          * return 0 means we want you to proceed with the abort non-zero
 701          * means no abort processing
 702          */
 703         struct sctpasochead *head;
 704
 705         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 706                 /* generate a new vtag and send init */
 707                 LIST_REMOVE(stcb, sctp_asocs);
 708                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 709                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 710                 /*
 711                  * put it in the bucket in the vtag hash of assoc's for the
 712                  * system
 713                  */
 714                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 715                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 716                 return (1);
 717         }
 718         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 719                 /*
 720                  * treat like a case where the cookie expired i.e.: - dump
 721                  * current cookie. - generate a new vtag. - resend init.
 722                  */
 723                 /* generate a new vtag and send init */
 724                 LIST_REMOVE(stcb, sctp_asocs);
 725                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 726                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 727                 sctp_stop_all_cookie_timers(stcb);
 728                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 729                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 730                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 731                 /*
 732                  * put it in the bucket in the vtag hash of assoc's for the
 733                  * system
 734                  */
 735                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 736                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 737                 return (1);
 738         }
 739         return (0);
 740 }
 741
 742 static int
 743 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 744     struct sctp_nets *net)
 745 {
 746         /*
 747          * return 0 means we want you to proceed with the abort non-zero
 748          * means no abort processing
 749          */
 750         if (stcb->asoc.auth_supported == 0) {
 751                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 752                 return (0);
 753         }
 754         sctp_asconf_send_nat_state_update(stcb, net);
 755         return (1);
 756 }
 757
 758
 759 static void
 760 sctp_handle_abort(struct sctp_abort_chunk *abort,
 761     struct sctp_tcb *stcb, struct sctp_nets *net)
 762 {
 763 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 764         struct socket *so;
 765
 766 #endif
 767         uint16_t len;
 768         uint16_t error;
 769
 770         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 771         if (stcb == NULL)
 772                 return;
 773
 774         len = ntohs(abort->ch.chunk_length);
 775         if (len > sizeof(struct sctp_chunkhdr)) {
 776                 /*
 777                  * Need to check the cause codes for our two magic nat
 778                  * aborts which don't kill the assoc necessarily.
 779                  */
 780                 struct sctp_gen_error_cause *cause;
 781
 782                 cause = (struct sctp_gen_error_cause *)(abort + 1);
 783                 error = ntohs(cause->code);
 784                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 785                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 786                             abort->ch.chunk_flags);
 787                         if (sctp_handle_nat_colliding_state(stcb)) {
 788                                 return;
 789                         }
 790                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 791                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 792                             abort->ch.chunk_flags);
 793                         if (sctp_handle_nat_missing_state(stcb, net)) {
 794                                 return;
 795                         }
 796                 }
 797         } else {
 798                 error = 0;
 799         }
 800         /* stop any receive timers */
 801         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 802             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 803         /* notify user of the abort and clean up... */
 804         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 805         /* free the tcb */
 806         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 807         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 808             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 809                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 810         }
 811 #ifdef SCTP_ASOCLOG_OF_TSNS
 812         sctp_print_out_track_log(stcb);
 813 #endif
 814 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 815         so = SCTP_INP_SO(stcb->sctp_ep);
 816         atomic_add_int(&stcb->asoc.refcnt, 1);
 817         SCTP_TCB_UNLOCK(stcb);
 818         SCTP_SOCKET_LOCK(so, 1);
 819         SCTP_TCB_LOCK(stcb);
 820         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 821 #endif
 822         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 823         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 824             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 825 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 826         SCTP_SOCKET_UNLOCK(so, 1);
 827 #endif
 828         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 829 }
 830
 831 static void
 832 sctp_start_net_timers(struct sctp_tcb *stcb)
 833 {
 834         uint32_t cnt_hb_sent;
 835         struct sctp_nets *net;
 836
 837         cnt_hb_sent = 0;
 838         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 839                 /*
 840                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 841                  * If the dest in unconfirmed send a hb as well if under
 842                  * max_hb_burst have been sent.
 843                  */
 844                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 845                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 846                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 847                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 848                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 849                         cnt_hb_sent++;
 850                 }
 851         }
 852         if (cnt_hb_sent) {
 853                 sctp_chunk_output(stcb->sctp_ep, stcb,
 854                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 855                     SCTP_SO_NOT_LOCKED);
 856         }
 857 }
 858
 859
 860 static void
 861 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 862     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 863 {
 864         struct sctp_association *asoc;
 865         int some_on_streamwheel;
 866         int old_state;
 867
 868 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 869         struct socket *so;
 870
 871 #endif
 872
 873         SCTPDBG(SCTP_DEBUG_INPUT2,
 874             "sctp_handle_shutdown: handling SHUTDOWN\n");
 875         if (stcb == NULL)
 876                 return;
 877         asoc = &stcb->asoc;
 878         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 879             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 880                 return;
 881         }
 882         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 883                 /* Shutdown NOT the expected size */
 884                 return;
 885         }
 886         old_state = SCTP_GET_STATE(asoc);
 887         sctp_update_acked(stcb, cp, abort_flag);
 888         if (*abort_flag) {
 889                 return;
 890         }
 891         if (asoc->control_pdapi) {
 892                 /*
 893                  * With a normal shutdown we assume the end of last record.
 894                  */
 895                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 896                 asoc->control_pdapi->end_added = 1;
 897                 asoc->control_pdapi->pdapi_aborted = 1;
 898                 asoc->control_pdapi = NULL;
 899                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 900 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 901                 so = SCTP_INP_SO(stcb->sctp_ep);
 902                 atomic_add_int(&stcb->asoc.refcnt, 1);
 903                 SCTP_TCB_UNLOCK(stcb);
 904                 SCTP_SOCKET_LOCK(so, 1);
 905                 SCTP_TCB_LOCK(stcb);
 906                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 907                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 908                         /* assoc was freed while we were unlocked */
 909                         SCTP_SOCKET_UNLOCK(so, 1);
 910                         return;
 911                 }
 912 #endif
 913                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 914 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 915                 SCTP_SOCKET_UNLOCK(so, 1);
 916 #endif
 917         }
 918         /* goto SHUTDOWN_RECEIVED state to block new requests */
 919         if (stcb->sctp_socket) {
 920                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 921                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 922                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 923                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 924                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 925                         /*
 926                          * notify upper layer that peer has initiated a
 927                          * shutdown
 928                          */
 929                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 930
 931                         /* reset time */
 932                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 933                 }
 934         }
 935         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 936                 /*
 937                  * stop the shutdown timer, since we WILL move to
 938                  * SHUTDOWN-ACK-SENT.
 939                  */
 940                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 941                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 942         }
 943         /* Now is there unsent data on a stream somewhere? */
 944         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 945
 946         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 947             !TAILQ_EMPTY(&asoc->sent_queue) ||
 948             some_on_streamwheel) {
 949                 /* By returning we will push more data out */
 950                 return;
 951         } else {
 952                 /* no outstanding data to send, so move on... */
 953                 /* send SHUTDOWN-ACK */
 954                 /* move to SHUTDOWN-ACK-SENT state */
 955                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 956                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 957                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 958                 }
 959                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 960                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 961                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 962                         sctp_stop_timers_for_shutdown(stcb);
 963                         sctp_send_shutdown_ack(stcb, net);
 964                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 965                             stcb->sctp_ep, stcb, net);
 966                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 967                         sctp_send_shutdown_ack(stcb, net);
 968                 }
 969         }
 970 }
 971
 972 static void
 973 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 974     struct sctp_tcb *stcb,
 975     struct sctp_nets *net)
 976 {
 977         struct sctp_association *asoc;
 978
 979 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 980         struct socket *so;
 981
 982         so = SCTP_INP_SO(stcb->sctp_ep);
 983 #endif
 984         SCTPDBG(SCTP_DEBUG_INPUT2,
 985             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 986         if (stcb == NULL)
 987                 return;
 988
 989         asoc = &stcb->asoc;
 990         /* process according to association state */
 991         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 992             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 993                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 994                 sctp_send_shutdown_complete(stcb, net, 1);
 995                 SCTP_TCB_UNLOCK(stcb);
 996                 return;
 997         }
 998         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 999             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1000                 /* unexpected SHUTDOWN-ACK... so ignore... */
1001                 SCTP_TCB_UNLOCK(stcb);
1002                 return;
1003         }
1004         if (asoc->control_pdapi) {
1005                 /*
1006                  * With a normal shutdown we assume the end of last record.
1007                  */
1008                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1009                 asoc->control_pdapi->end_added = 1;
1010                 asoc->control_pdapi->pdapi_aborted = 1;
1011                 asoc->control_pdapi = NULL;
1012                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1013 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1014                 atomic_add_int(&stcb->asoc.refcnt, 1);
1015                 SCTP_TCB_UNLOCK(stcb);
1016                 SCTP_SOCKET_LOCK(so, 1);
1017                 SCTP_TCB_LOCK(stcb);
1018                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1019                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1020                         /* assoc was freed while we were unlocked */
1021                         SCTP_SOCKET_UNLOCK(so, 1);
1022                         return;
1023                 }
1024 #endif
1025                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1026 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1027                 SCTP_SOCKET_UNLOCK(so, 1);
1028 #endif
1029         }
1030 #ifdef INVARIANTS
1031         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1032             !TAILQ_EMPTY(&asoc->sent_queue) ||
1033             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1034                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1035         }
1036 #endif
1037         /* stop the timer */
1038         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1039             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1040         /* send SHUTDOWN-COMPLETE */
1041         sctp_send_shutdown_complete(stcb, net, 0);
1042         /* notify upper layer protocol */
1043         if (stcb->sctp_socket) {
1044                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1045                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1046                         stcb->sctp_socket->so_snd.sb_cc = 0;
1047                 }
1048                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1049         }
1050         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1051         /* free the TCB but first save off the ep */
1052 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1053         atomic_add_int(&stcb->asoc.refcnt, 1);
1054         SCTP_TCB_UNLOCK(stcb);
1055         SCTP_SOCKET_LOCK(so, 1);
1056         SCTP_TCB_LOCK(stcb);
1057         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1058 #endif
1059         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1060             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1061 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1062         SCTP_SOCKET_UNLOCK(so, 1);
1063 #endif
1064 }
1065
1066 /*
1067  * Skip past the param header and then we will find the chunk that caused the
1068  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1069  * our peer must be broken.
1070  */
1071 static void
1072 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1073     struct sctp_nets *net)
1074 {
1075         struct sctp_chunkhdr *chk;
1076
1077         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1078         switch (chk->chunk_type) {
1079         case SCTP_ASCONF_ACK:
1080         case SCTP_ASCONF:
1081                 sctp_asconf_cleanup(stcb, net);
1082                 break;
1083         case SCTP_FORWARD_CUM_TSN:
1084                 stcb->asoc.prsctp_supported = 0;
1085                 break;
1086         default:
1087                 SCTPDBG(SCTP_DEBUG_INPUT2,
1088                     "Peer does not support chunk type %d(%x)??\n",
1089                     chk->chunk_type, (uint32_t) chk->chunk_type);
1090                 break;
1091         }
1092 }
1093
1094 /*
1095  * Skip past the param header and then we will find the param that caused the
1096  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1097  * these will turn of specific features.
1098  * XXX: Is this the right thing to do?
1099  */
1100 static void
1101 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1102 {
1103         struct sctp_paramhdr *pbad;
1104
1105         pbad = phdr + 1;
1106         switch (ntohs(pbad->param_type)) {
1107                 /* pr-sctp draft */
1108         case SCTP_PRSCTP_SUPPORTED:
1109                 stcb->asoc.prsctp_supported = 0;
1110                 break;
1111         case SCTP_SUPPORTED_CHUNK_EXT:
1112                 break;
1113                 /* draft-ietf-tsvwg-addip-sctp */
1114         case SCTP_HAS_NAT_SUPPORT:
1115                 stcb->asoc.peer_supports_nat = 0;
1116                 break;
1117         case SCTP_ADD_IP_ADDRESS:
1118         case SCTP_DEL_IP_ADDRESS:
1119         case SCTP_SET_PRIM_ADDR:
1120                 stcb->asoc.asconf_supported = 0;
1121                 break;
1122         case SCTP_SUCCESS_REPORT:
1123         case SCTP_ERROR_CAUSE_IND:
1124                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1125                 SCTPDBG(SCTP_DEBUG_INPUT2,
1126                     "Turning off ASCONF to this strange peer\n");
1127                 stcb->asoc.asconf_supported = 0;
1128                 break;
1129         default:
1130                 SCTPDBG(SCTP_DEBUG_INPUT2,
1131                     "Peer does not support param type %d(%x)??\n",
1132                     pbad->param_type, (uint32_t) pbad->param_type);
1133                 break;
1134         }
1135 }
1136
1137 static int
1138 sctp_handle_error(struct sctp_chunkhdr *ch,
1139     struct sctp_tcb *stcb, struct sctp_nets *net)
1140 {
1141         int chklen;
1142         struct sctp_paramhdr *phdr;
1143         uint16_t error, error_type;
1144         uint16_t error_len;
1145         struct sctp_association *asoc;
1146         int adjust;
1147
1148 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1149         struct socket *so;
1150
1151 #endif
1152
1153         /* parse through all of the errors and process */
1154         asoc = &stcb->asoc;
1155         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1156             sizeof(struct sctp_chunkhdr));
1157         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1158         error = 0;
1159         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1160                 /* Process an Error Cause */
1161                 error_type = ntohs(phdr->param_type);
1162                 error_len = ntohs(phdr->param_length);
1163                 if ((error_len > chklen) || (error_len == 0)) {
1164                         /* invalid param length for this param */
1165                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1166                             chklen, error_len);
1167                         return (0);
1168                 }
1169                 if (error == 0) {
1170                         /* report the first error cause */
1171                         error = error_type;
1172                 }
1173                 switch (error_type) {
1174                 case SCTP_CAUSE_INVALID_STREAM:
1175                 case SCTP_CAUSE_MISSING_PARAM:
1176                 case SCTP_CAUSE_INVALID_PARAM:
1177                 case SCTP_CAUSE_NO_USER_DATA:
1178                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1179                             error_type);
1180                         break;
1181                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1182                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1183                             ch->chunk_flags);
1184                         if (sctp_handle_nat_colliding_state(stcb)) {
1185                                 return (0);
1186                         }
1187                         break;
1188                 case SCTP_CAUSE_NAT_MISSING_STATE:
1189                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1190                             ch->chunk_flags);
1191                         if (sctp_handle_nat_missing_state(stcb, net)) {
1192                                 return (0);
1193                         }
1194                         break;
1195                 case SCTP_CAUSE_STALE_COOKIE:
1196                         /*
1197                          * We only act if we have echoed a cookie and are
1198                          * waiting.
1199                          */
1200                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1201                                 int *p;
1202
1203                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1204                                 /* Save the time doubled */
1205                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1206                                 asoc->stale_cookie_count++;
1207                                 if (asoc->stale_cookie_count >
1208                                     asoc->max_init_times) {
1209                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1210                                         /* now free the asoc */
1211 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1212                                         so = SCTP_INP_SO(stcb->sctp_ep);
1213                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1214                                         SCTP_TCB_UNLOCK(stcb);
1215                                         SCTP_SOCKET_LOCK(so, 1);
1216                                         SCTP_TCB_LOCK(stcb);
1217                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1218 #endif
1219                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1220                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1221 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1222                                         SCTP_SOCKET_UNLOCK(so, 1);
1223 #endif
1224                                         return (-1);
1225                                 }
1226                                 /* blast back to INIT state */
1227                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1228                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1229                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1230                                 sctp_stop_all_cookie_timers(stcb);
1231                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1232                         }
1233                         break;
1234                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1235                         /*
1236                          * Nothing we can do here, we don't do hostname
1237                          * addresses so if the peer does not like my IPv6
1238                          * (or IPv4 for that matter) it does not matter. If
1239                          * they don't support that type of address, they can
1240                          * NOT possibly get that packet type... i.e. with no
1241                          * IPv6 you can't recieve a IPv6 packet. so we can
1242                          * safely ignore this one. If we ever added support
1243                          * for HOSTNAME Addresses, then we would need to do
1244                          * something here.
1245                          */
1246                         break;
1247                 case SCTP_CAUSE_UNRECOG_CHUNK:
1248                         sctp_process_unrecog_chunk(stcb, phdr, net);
1249                         break;
1250                 case SCTP_CAUSE_UNRECOG_PARAM:
1251                         sctp_process_unrecog_param(stcb, phdr);
1252                         break;
1253                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1254                         /*
1255                          * We ignore this since the timer will drive out a
1256                          * new cookie anyway and there timer will drive us
1257                          * to send a SHUTDOWN_COMPLETE. We can't send one
1258                          * here since we don't have their tag.
1259                          */
1260                         break;
1261                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1262                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1263                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1264                         /*
1265                          * We should NOT get these here, but in a
1266                          * ASCONF-ACK.
1267                          */
1268                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1269                             error_type);
1270                         break;
1271                 case SCTP_CAUSE_OUT_OF_RESC:
1272                         /*
1273                          * And what, pray tell do we do with the fact that
1274                          * the peer is out of resources? Not really sure we
1275                          * could do anything but abort. I suspect this
1276                          * should have came WITH an abort instead of in a
1277                          * OP-ERROR.
1278                          */
1279                         break;
1280                 default:
1281                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1282                             error_type);
1283                         break;
1284                 }
1285                 adjust = SCTP_SIZE32(error_len);
1286                 chklen -= adjust;
1287                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1288         }
1289         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1290         return (0);
1291 }
1292
1293 static int
1294 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1295     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1296     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1297     struct sctp_nets *net, int *abort_no_unlock,
1298     uint8_t mflowtype, uint32_t mflowid,
1299     uint32_t vrf_id)
1300 {
1301         struct sctp_init_ack *init_ack;
1302         struct mbuf *op_err;
1303
1304         SCTPDBG(SCTP_DEBUG_INPUT2,
1305             "sctp_handle_init_ack: handling INIT-ACK\n");
1306
1307         if (stcb == NULL) {
1308                 SCTPDBG(SCTP_DEBUG_INPUT2,
1309                     "sctp_handle_init_ack: TCB is null\n");
1310                 return (-1);
1311         }
1312         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1313                 /* Invalid length */
1314                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1315                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1316                     src, dst, sh, op_err,
1317                     mflowtype, mflowid,
1318                     vrf_id, net->port);
1319                 *abort_no_unlock = 1;
1320                 return (-1);
1321         }
1322         init_ack = &cp->init;
1323         /* validate parameters */
1324         if (init_ack->initiate_tag == 0) {
1325                 /* protocol error... send an abort */
1326                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1327                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1328                     src, dst, sh, op_err,
1329                     mflowtype, mflowid,
1330                     vrf_id, net->port);
1331                 *abort_no_unlock = 1;
1332                 return (-1);
1333         }
1334         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1335                 /* protocol error... send an abort */
1336                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1337                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1338                     src, dst, sh, op_err,
1339                     mflowtype, mflowid,
1340                     vrf_id, net->port);
1341                 *abort_no_unlock = 1;
1342                 return (-1);
1343         }
1344         if (init_ack->num_inbound_streams == 0) {
1345                 /* protocol error... send an abort */
1346                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1347                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1348                     src, dst, sh, op_err,
1349                     mflowtype, mflowid,
1350                     vrf_id, net->port);
1351                 *abort_no_unlock = 1;
1352                 return (-1);
1353         }
1354         if (init_ack->num_outbound_streams == 0) {
1355                 /* protocol error... send an abort */
1356                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1357                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1358                     src, dst, sh, op_err,
1359                     mflowtype, mflowid,
1360                     vrf_id, net->port);
1361                 *abort_no_unlock = 1;
1362                 return (-1);
1363         }
1364         /* process according to association state... */
1365         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1366         case SCTP_STATE_COOKIE_WAIT:
1367                 /* this is the expected state for this chunk */
1368                 /* process the INIT-ACK parameters */
1369                 if (stcb->asoc.primary_destination->dest_state &
1370                     SCTP_ADDR_UNCONFIRMED) {
1371                         /*
1372                          * The primary is where we sent the INIT, we can
1373                          * always consider it confirmed when the INIT-ACK is
1374                          * returned. Do this before we load addresses
1375                          * though.
1376                          */
1377                         stcb->asoc.primary_destination->dest_state &=
1378                             ~SCTP_ADDR_UNCONFIRMED;
1379                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1380                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1381                 }
1382                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1383                     net, abort_no_unlock,
1384                     mflowtype, mflowid,
1385                     vrf_id) < 0) {
1386                         /* error in parsing parameters */
1387                         return (-1);
1388                 }
1389                 /* update our state */
1390                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1391                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1392
1393                 /* reset the RTO calc */
1394                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1395                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1396                             stcb->asoc.overall_error_count,
1397                             0,
1398                             SCTP_FROM_SCTP_INPUT,
1399                             __LINE__);
1400                 }
1401                 stcb->asoc.overall_error_count = 0;
1402                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1403                 /*
1404                  * collapse the init timer back in case of a exponential
1405                  * backoff
1406                  */
1407                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1408                     stcb, net);
1409                 /*
1410                  * the send at the end of the inbound data processing will
1411                  * cause the cookie to be sent
1412                  */
1413                 break;
1414         case SCTP_STATE_SHUTDOWN_SENT:
1415                 /* incorrect state... discard */
1416                 break;
1417         case SCTP_STATE_COOKIE_ECHOED:
1418                 /* incorrect state... discard */
1419                 break;
1420         case SCTP_STATE_OPEN:
1421                 /* incorrect state... discard */
1422                 break;
1423         case SCTP_STATE_EMPTY:
1424         case SCTP_STATE_INUSE:
1425         default:
1426                 /* incorrect state... discard */
1427                 return (-1);
1428                 break;
1429         }
1430         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1431         return (0);
1432 }
1433
1434 static struct sctp_tcb *
1435 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1436     struct sockaddr *src, struct sockaddr *dst,
1437     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1438     struct sctp_inpcb *inp, struct sctp_nets **netp,
1439     struct sockaddr *init_src, int *notification,
1440     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1441     uint8_t mflowtype, uint32_t mflowid,
1442     uint32_t vrf_id, uint16_t port);
1443
1444
1445 /*
1446  * handle a state cookie for an existing association m: input packet mbuf
1447  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1448  * "split" mbuf and the cookie signature does not exist offset: offset into
1449  * mbuf to the cookie-echo chunk
1450  */
1451 static struct sctp_tcb *
1452 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1453     struct sockaddr *src, struct sockaddr *dst,
1454     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1455     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1456     struct sockaddr *init_src, int *notification,
1457     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1458     uint8_t mflowtype, uint32_t mflowid,
1459     uint32_t vrf_id, uint16_t port)
1460 {
1461         struct sctp_association *asoc;
1462         struct sctp_init_chunk *init_cp, init_buf;
1463         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1464         struct sctp_nets *net;
1465         struct mbuf *op_err;
1466         int init_offset, initack_offset, i;
1467         int retval;
1468         int spec_flag = 0;
1469         uint32_t how_indx;
1470
1471 #if defined(SCTP_DETAILED_STR_STATS)
1472         int j;
1473
1474 #endif
1475
1476         net = *netp;
1477         /* I know that the TCB is non-NULL from the caller */
1478         asoc = &stcb->asoc;
1479         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1480                 if (asoc->cookie_how[how_indx] == 0)
1481                         break;
1482         }
1483         if (how_indx < sizeof(asoc->cookie_how)) {
1484                 asoc->cookie_how[how_indx] = 1;
1485         }
1486         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1487                 /* SHUTDOWN came in after sending INIT-ACK */
1488                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1489                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1490                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1491                     mflowtype, mflowid, inp->fibnum,
1492                     vrf_id, net->port);
1493                 if (how_indx < sizeof(asoc->cookie_how))
1494                         asoc->cookie_how[how_indx] = 2;
1495                 return (NULL);
1496         }
1497         /*
1498          * find and validate the INIT chunk in the cookie (peer's info) the
1499          * INIT should start after the cookie-echo header struct (chunk
1500          * header, state cookie header struct)
1501          */
1502         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1503
1504         init_cp = (struct sctp_init_chunk *)
1505             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1506             (uint8_t *) & init_buf);
1507         if (init_cp == NULL) {
1508                 /* could not pull a INIT chunk in cookie */
1509                 return (NULL);
1510         }
1511         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1512                 return (NULL);
1513         }
1514         /*
1515          * find and validate the INIT-ACK chunk in the cookie (my info) the
1516          * INIT-ACK follows the INIT chunk
1517          */
1518         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1519         initack_cp = (struct sctp_init_ack_chunk *)
1520             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1521             (uint8_t *) & initack_buf);
1522         if (initack_cp == NULL) {
1523                 /* could not pull INIT-ACK chunk in cookie */
1524                 return (NULL);
1525         }
1526         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1527                 return (NULL);
1528         }
1529         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1530             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1531                 /*
1532                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1533                  * to get into the OPEN state
1534                  */
1535                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1536                         /*-
1537                          * Opps, this means that we somehow generated two vtag's
1538                          * the same. I.e. we did:
1539                          *  Us               Peer
1540                          *   <---INIT(tag=a)------
1541                          *   ----INIT-ACK(tag=t)-->
1542                          *   ----INIT(tag=t)------> *1
1543                          *   <---INIT-ACK(tag=a)---
1544                          *   <----CE(tag=t)------------- *2
1545                          *
1546                          * At point *1 we should be generating a different
1547                          * tag t'. Which means we would throw away the CE and send
1548                          * ours instead. Basically this is case C (throw away side).
1549                          */
1550                         if (how_indx < sizeof(asoc->cookie_how))
1551                                 asoc->cookie_how[how_indx] = 17;
1552                         return (NULL);
1553
1554                 }
1555                 switch (SCTP_GET_STATE(asoc)) {
1556                 case SCTP_STATE_COOKIE_WAIT:
1557                 case SCTP_STATE_COOKIE_ECHOED:
1558                         /*
1559                          * INIT was sent but got a COOKIE_ECHO with the
1560                          * correct tags... just accept it...but we must
1561                          * process the init so that we can make sure we have
1562                          * the right seq no's.
1563                          */
1564                         /* First we must process the INIT !! */
1565                         retval = sctp_process_init(init_cp, stcb);
1566                         if (retval < 0) {
1567                                 if (how_indx < sizeof(asoc->cookie_how))
1568                                         asoc->cookie_how[how_indx] = 3;
1569                                 return (NULL);
1570                         }
1571                         /* we have already processed the INIT so no problem */
1572                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1573                             stcb, net,
1574                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1575                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1576                             stcb, net,
1577                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1578                         /* update current state */
1579                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1580                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1581                         else
1582                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1583
1584                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1585                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1586                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1587                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1588                         }
1589                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1590                         sctp_stop_all_cookie_timers(stcb);
1591                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1592                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1593                             (inp->sctp_socket->so_qlimit == 0)
1594                             ) {
1595 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1596                                 struct socket *so;
1597
1598 #endif
1599                                 /*
1600                                  * Here is where collision would go if we
1601                                  * did a connect() and instead got a
1602                                  * init/init-ack/cookie done before the
1603                                  * init-ack came back..
1604                                  */
1605                                 stcb->sctp_ep->sctp_flags |=
1606                                     SCTP_PCB_FLAGS_CONNECTED;
1607 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1608                                 so = SCTP_INP_SO(stcb->sctp_ep);
1609                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1610                                 SCTP_TCB_UNLOCK(stcb);
1611                                 SCTP_SOCKET_LOCK(so, 1);
1612                                 SCTP_TCB_LOCK(stcb);
1613                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1614                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1615                                         SCTP_SOCKET_UNLOCK(so, 1);
1616                                         return (NULL);
1617                                 }
1618 #endif
1619                                 soisconnected(stcb->sctp_socket);
1620 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1621                                 SCTP_SOCKET_UNLOCK(so, 1);
1622 #endif
1623                         }
1624                         /* notify upper layer */
1625                         *notification = SCTP_NOTIFY_ASSOC_UP;
1626                         /*
1627                          * since we did not send a HB make sure we don't
1628                          * double things
1629                          */
1630                         net->hb_responded = 1;
1631                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1632                             &cookie->time_entered,
1633                             sctp_align_unsafe_makecopy,
1634                             SCTP_RTT_FROM_NON_DATA);
1635
1636                         if (stcb->asoc.sctp_autoclose_ticks &&
1637                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1638                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1639                                     inp, stcb, NULL);
1640                         }
1641                         break;
1642                 default:
1643                         /*
1644                          * we're in the OPEN state (or beyond), so peer must
1645                          * have simply lost the COOKIE-ACK
1646                          */
1647                         break;
1648                 }               /* end switch */
1649                 sctp_stop_all_cookie_timers(stcb);
1650                 /*
1651                  * We ignore the return code here.. not sure if we should
1652                  * somehow abort.. but we do have an existing asoc. This
1653                  * really should not fail.
1654                  */
1655                 if (sctp_load_addresses_from_init(stcb, m,
1656                     init_offset + sizeof(struct sctp_init_chunk),
1657                     initack_offset, src, dst, init_src)) {
1658                         if (how_indx < sizeof(asoc->cookie_how))
1659                                 asoc->cookie_how[how_indx] = 4;
1660                         return (NULL);
1661                 }
1662                 /* respond with a COOKIE-ACK */
1663                 sctp_toss_old_cookies(stcb, asoc);
1664                 sctp_send_cookie_ack(stcb);
1665                 if (how_indx < sizeof(asoc->cookie_how))
1666                         asoc->cookie_how[how_indx] = 5;
1667                 return (stcb);
1668         }
1669         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1670             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1671             cookie->tie_tag_my_vtag == 0 &&
1672             cookie->tie_tag_peer_vtag == 0) {
1673                 /*
1674                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1675                  */
1676                 if (how_indx < sizeof(asoc->cookie_how))
1677                         asoc->cookie_how[how_indx] = 6;
1678                 return (NULL);
1679         }
1680         /*
1681          * If nat support, and the below and stcb is established, send back
1682          * a ABORT(colliding state) if we are established.
1683          */
1684         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1685             (asoc->peer_supports_nat) &&
1686             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1687             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1688             (asoc->peer_vtag == 0)))) {
1689                 /*
1690                  * Special case - Peer's support nat. We may have two init's
1691                  * that we gave out the same tag on since one was not
1692                  * established.. i.e. we get INIT from host-1 behind the nat
1693                  * and we respond tag-a, we get a INIT from host-2 behind
1694                  * the nat and we get tag-a again. Then we bring up host-1
1695                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1696                  * Now we have colliding state. We must send an abort here
1697                  * with colliding state indication.
1698                  */
1699                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1700                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1701                     mflowtype, mflowid, inp->fibnum,
1702                     vrf_id, port);
1703                 return (NULL);
1704         }
1705         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1706             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1707             (asoc->peer_vtag == 0))) {
1708                 /*
1709                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1710                  * should be ok, re-accept peer info
1711                  */
1712                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1713                         /*
1714                          * Extension of case C. If we hit this, then the
1715                          * random number generator returned the same vtag
1716                          * when we first sent our INIT-ACK and when we later
1717                          * sent our INIT. The side with the seq numbers that
1718                          * are different will be the one that normnally
1719                          * would have hit case C. This in effect "extends"
1720                          * our vtags in this collision case to be 64 bits.
1721                          * The same collision could occur aka you get both
1722                          * vtag and seq number the same twice in a row.. but
1723                          * is much less likely. If it did happen then we
1724                          * would proceed through and bring up the assoc.. we
1725                          * may end up with the wrong stream setup however..
1726                          * which would be bad.. but there is no way to
1727                          * tell.. until we send on a stream that does not
1728                          * exist :-)
1729                          */
1730                         if (how_indx < sizeof(asoc->cookie_how))
1731                                 asoc->cookie_how[how_indx] = 7;
1732
1733                         return (NULL);
1734                 }
1735                 if (how_indx < sizeof(asoc->cookie_how))
1736                         asoc->cookie_how[how_indx] = 8;
1737                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1738                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1739                 sctp_stop_all_cookie_timers(stcb);
1740                 /*
1741                  * since we did not send a HB make sure we don't double
1742                  * things
1743                  */
1744                 net->hb_responded = 1;
1745                 if (stcb->asoc.sctp_autoclose_ticks &&
1746                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1747                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1748                             NULL);
1749                 }
1750                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1751                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1752
1753                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1754                         /*
1755                          * Ok the peer probably discarded our data (if we
1756                          * echoed a cookie+data). So anything on the
1757                          * sent_queue should be marked for retransmit, we
1758                          * may not get something to kick us so it COULD
1759                          * still take a timeout to move these.. but it can't
1760                          * hurt to mark them.
1761                          */
1762                         struct sctp_tmit_chunk *chk;
1763
1764                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1765                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1766                                         chk->sent = SCTP_DATAGRAM_RESEND;
1767                                         sctp_flight_size_decrease(chk);
1768                                         sctp_total_flight_decrease(stcb, chk);
1769                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1770                                         spec_flag++;
1771                                 }
1772                         }
1773
1774                 }
1775                 /* process the INIT info (peer's info) */
1776                 retval = sctp_process_init(init_cp, stcb);
1777                 if (retval < 0) {
1778                         if (how_indx < sizeof(asoc->cookie_how))
1779                                 asoc->cookie_how[how_indx] = 9;
1780                         return (NULL);
1781                 }
1782                 if (sctp_load_addresses_from_init(stcb, m,
1783                     init_offset + sizeof(struct sctp_init_chunk),
1784                     initack_offset, src, dst, init_src)) {
1785                         if (how_indx < sizeof(asoc->cookie_how))
1786                                 asoc->cookie_how[how_indx] = 10;
1787                         return (NULL);
1788                 }
1789                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1790                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1791                         *notification = SCTP_NOTIFY_ASSOC_UP;
1792
1793                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1794                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1795                             (inp->sctp_socket->so_qlimit == 0)) {
1796 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1797                                 struct socket *so;
1798
1799 #endif
1800                                 stcb->sctp_ep->sctp_flags |=
1801                                     SCTP_PCB_FLAGS_CONNECTED;
1802 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1803                                 so = SCTP_INP_SO(stcb->sctp_ep);
1804                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1805                                 SCTP_TCB_UNLOCK(stcb);
1806                                 SCTP_SOCKET_LOCK(so, 1);
1807                                 SCTP_TCB_LOCK(stcb);
1808                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1809                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1810                                         SCTP_SOCKET_UNLOCK(so, 1);
1811                                         return (NULL);
1812                                 }
1813 #endif
1814                                 soisconnected(stcb->sctp_socket);
1815 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1816                                 SCTP_SOCKET_UNLOCK(so, 1);
1817 #endif
1818                         }
1819                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1820                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1821                         else
1822                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1823                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1824                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1825                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1826                 } else {
1827                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1828                 }
1829                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1830                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1831                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1832                             stcb->sctp_ep, stcb, asoc->primary_destination);
1833                 }
1834                 sctp_stop_all_cookie_timers(stcb);
1835                 sctp_toss_old_cookies(stcb, asoc);
1836                 sctp_send_cookie_ack(stcb);
1837                 if (spec_flag) {
1838                         /*
1839                          * only if we have retrans set do we do this. What
1840                          * this call does is get only the COOKIE-ACK out and
1841                          * then when we return the normal call to
1842                          * sctp_chunk_output will get the retrans out behind
1843                          * this.
1844                          */
1845                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1846                 }
1847                 if (how_indx < sizeof(asoc->cookie_how))
1848                         asoc->cookie_how[how_indx] = 11;
1849
1850                 return (stcb);
1851         }
1852         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1853             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1854             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1855             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1856             cookie->tie_tag_peer_vtag != 0) {
1857                 struct sctpasochead *head;
1858
1859 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1860                 struct socket *so;
1861
1862 #endif
1863
1864                 if (asoc->peer_supports_nat) {
1865                         /*
1866                          * This is a gross gross hack. Just call the
1867                          * cookie_new code since we are allowing a duplicate
1868                          * association. I hope this works...
1869                          */
1870                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1871                             sh, cookie, cookie_len,
1872                             inp, netp, init_src, notification,
1873                             auth_skipped, auth_offset, auth_len,
1874                             mflowtype, mflowid,
1875                             vrf_id, port));
1876                 }
1877                 /*
1878                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1879                  */
1880                 /* temp code */
1881                 if (how_indx < sizeof(asoc->cookie_how))
1882                         asoc->cookie_how[how_indx] = 12;
1883                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1884                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1885                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1886                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1887
1888                 /* notify upper layer */
1889                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1890                 atomic_add_int(&stcb->asoc.refcnt, 1);
1891                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1892                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1893                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1894                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1895                 }
1896                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1897                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1898                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1899                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1900                 }
1901                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1902                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1903                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1904                             stcb->sctp_ep, stcb, asoc->primary_destination);
1905
1906                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1907                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1908                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1909                 }
1910                 asoc->pre_open_streams =
1911                     ntohs(initack_cp->init.num_outbound_streams);
1912                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1913                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1914                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1915
1916                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1917
1918                 asoc->str_reset_seq_in = asoc->init_seq_number;
1919
1920                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1921                 if (asoc->mapping_array) {
1922                         memset(asoc->mapping_array, 0,
1923                             asoc->mapping_array_size);
1924                 }
1925                 if (asoc->nr_mapping_array) {
1926                         memset(asoc->nr_mapping_array, 0,
1927                             asoc->mapping_array_size);
1928                 }
1929                 SCTP_TCB_UNLOCK(stcb);
1930 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1931                 so = SCTP_INP_SO(stcb->sctp_ep);
1932                 SCTP_SOCKET_LOCK(so, 1);
1933 #endif
1934                 SCTP_INP_INFO_WLOCK();
1935                 SCTP_INP_WLOCK(stcb->sctp_ep);
1936                 SCTP_TCB_LOCK(stcb);
1937                 atomic_add_int(&stcb->asoc.refcnt, -1);
1938                 /* send up all the data */
1939                 SCTP_TCB_SEND_LOCK(stcb);
1940
1941                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1942                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1943                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1944 #if defined(SCTP_DETAILED_STR_STATS)
1945                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1946                                 asoc->strmout[i].abandoned_sent[j] = 0;
1947                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1948                         }
1949 #else
1950                         asoc->strmout[i].abandoned_sent[0] = 0;
1951                         asoc->strmout[i].abandoned_unsent[0] = 0;
1952 #endif
1953                         stcb->asoc.strmout[i].stream_no = i;
1954                         stcb->asoc.strmout[i].next_sequence_send = 0;
1955                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1956                 }
1957                 /* process the INIT-ACK info (my info) */
1958                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1959                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1960
1961                 /* pull from vtag hash */
1962                 LIST_REMOVE(stcb, sctp_asocs);
1963                 /* re-insert to new vtag position */
1964                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1965                     SCTP_BASE_INFO(hashasocmark))];
1966                 /*
1967                  * put it in the bucket in the vtag hash of assoc's for the
1968                  * system
1969                  */
1970                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1971
1972                 SCTP_TCB_SEND_UNLOCK(stcb);
1973                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1974                 SCTP_INP_INFO_WUNLOCK();
1975 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1976                 SCTP_SOCKET_UNLOCK(so, 1);
1977 #endif
1978                 asoc->total_flight = 0;
1979                 asoc->total_flight_count = 0;
1980                 /* process the INIT info (peer's info) */
1981                 retval = sctp_process_init(init_cp, stcb);
1982                 if (retval < 0) {
1983                         if (how_indx < sizeof(asoc->cookie_how))
1984                                 asoc->cookie_how[how_indx] = 13;
1985
1986                         return (NULL);
1987                 }
1988                 /*
1989                  * since we did not send a HB make sure we don't double
1990                  * things
1991                  */
1992                 net->hb_responded = 1;
1993
1994                 if (sctp_load_addresses_from_init(stcb, m,
1995                     init_offset + sizeof(struct sctp_init_chunk),
1996                     initack_offset, src, dst, init_src)) {
1997                         if (how_indx < sizeof(asoc->cookie_how))
1998                                 asoc->cookie_how[how_indx] = 14;
1999
2000                         return (NULL);
2001                 }
2002                 /* respond with a COOKIE-ACK */
2003                 sctp_stop_all_cookie_timers(stcb);
2004                 sctp_toss_old_cookies(stcb, asoc);
2005                 sctp_send_cookie_ack(stcb);
2006                 if (how_indx < sizeof(asoc->cookie_how))
2007                         asoc->cookie_how[how_indx] = 15;
2008
2009                 return (stcb);
2010         }
2011         if (how_indx < sizeof(asoc->cookie_how))
2012                 asoc->cookie_how[how_indx] = 16;
2013         /* all other cases... */
2014         return (NULL);
2015 }
2016
2017
2018 /*
2019  * handle a state cookie for a new association m: input packet mbuf chain--
2020  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2021  * and the cookie signature does not exist offset: offset into mbuf to the
2022  * cookie-echo chunk length: length of the cookie chunk to: where the init
2023  * was from returns a new TCB
2024  */
2025 static struct sctp_tcb *
2026 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2027     struct sockaddr *src, struct sockaddr *dst,
2028     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2029     struct sctp_inpcb *inp, struct sctp_nets **netp,
2030     struct sockaddr *init_src, int *notification,
2031     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2032     uint8_t mflowtype, uint32_t mflowid,
2033     uint32_t vrf_id, uint16_t port)
2034 {
2035         struct sctp_tcb *stcb;
2036         struct sctp_init_chunk *init_cp, init_buf;
2037         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2038         union sctp_sockstore store;
2039         struct sctp_association *asoc;
2040         int init_offset, initack_offset, initack_limit;
2041         int retval;
2042         int error = 0;
2043         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2044
2045 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2046         struct socket *so;
2047
2048         so = SCTP_INP_SO(inp);
2049 #endif
2050
2051         /*
2052          * find and validate the INIT chunk in the cookie (peer's info) the
2053          * INIT should start after the cookie-echo header struct (chunk
2054          * header, state cookie header struct)
2055          */
2056         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2057         init_cp = (struct sctp_init_chunk *)
2058             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2059             (uint8_t *) & init_buf);
2060         if (init_cp == NULL) {
2061                 /* could not pull a INIT chunk in cookie */
2062                 SCTPDBG(SCTP_DEBUG_INPUT1,
2063                     "process_cookie_new: could not pull INIT chunk hdr\n");
2064                 return (NULL);
2065         }
2066         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2067                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2068                 return (NULL);
2069         }
2070         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2071         /*
2072          * find and validate the INIT-ACK chunk in the cookie (my info) the
2073          * INIT-ACK follows the INIT chunk
2074          */
2075         initack_cp = (struct sctp_init_ack_chunk *)
2076             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2077             (uint8_t *) & initack_buf);
2078         if (initack_cp == NULL) {
2079                 /* could not pull INIT-ACK chunk in cookie */
2080                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2081                 return (NULL);
2082         }
2083         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2084                 return (NULL);
2085         }
2086         /*
2087          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2088          * "initack_limit" value.  This is because the chk_length field
2089          * includes the length of the cookie, but the cookie is omitted when
2090          * the INIT and INIT_ACK are tacked onto the cookie...
2091          */
2092         initack_limit = offset + cookie_len;
2093
2094         /*
2095          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2096          * and popluate
2097          */
2098
2099         /*
2100          * Here we do a trick, we set in NULL for the proc/thread argument.
2101          * We do this since in effect we only use the p argument when the
2102          * socket is unbound and we must do an implicit bind. Since we are
2103          * getting a cookie, we cannot be unbound.
2104          */
2105         stcb = sctp_aloc_assoc(inp, init_src, &error,
2106             ntohl(initack_cp->init.initiate_tag), vrf_id,
2107             (struct thread *)NULL
2108             );
2109         if (stcb == NULL) {
2110                 struct mbuf *op_err;
2111
2112                 /* memory problem? */
2113                 SCTPDBG(SCTP_DEBUG_INPUT1,
2114                     "process_cookie_new: no room for another TCB!\n");
2115                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2116                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2117                     src, dst, sh, op_err,
2118                     mflowtype, mflowid,
2119                     vrf_id, port);
2120                 return (NULL);
2121         }
2122         /* get the correct sctp_nets */
2123         if (netp)
2124                 *netp = sctp_findnet(stcb, init_src);
2125
2126         asoc = &stcb->asoc;
2127         /* get scope variables out of cookie */
2128         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2129         asoc->scope.site_scope = cookie->site_scope;
2130         asoc->scope.local_scope = cookie->local_scope;
2131         asoc->scope.loopback_scope = cookie->loopback_scope;
2132
2133         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2134             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2135                 struct mbuf *op_err;
2136
2137                 /*
2138                  * Houston we have a problem. The EP changed while the
2139                  * cookie was in flight. Only recourse is to abort the
2140                  * association.
2141                  */
2142                 atomic_add_int(&stcb->asoc.refcnt, 1);
2143                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2144                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2145                     src, dst, sh, op_err,
2146                     mflowtype, mflowid,
2147                     vrf_id, port);
2148 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2149                 SCTP_TCB_UNLOCK(stcb);
2150                 SCTP_SOCKET_LOCK(so, 1);
2151                 SCTP_TCB_LOCK(stcb);
2152 #endif
2153                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2154                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2155 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2156                 SCTP_SOCKET_UNLOCK(so, 1);
2157 #endif
2158                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2159                 return (NULL);
2160         }
2161         /* process the INIT-ACK info (my info) */
2162         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2163         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2164         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2165         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2166         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2167         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2168         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2169         asoc->str_reset_seq_in = asoc->init_seq_number;
2170
2171         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2172
2173         /* process the INIT info (peer's info) */
2174         if (netp)
2175                 retval = sctp_process_init(init_cp, stcb);
2176         else
2177                 retval = 0;
2178         if (retval < 0) {
2179                 atomic_add_int(&stcb->asoc.refcnt, 1);
2180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2181                 SCTP_TCB_UNLOCK(stcb);
2182                 SCTP_SOCKET_LOCK(so, 1);
2183                 SCTP_TCB_LOCK(stcb);
2184 #endif
2185                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2186                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2187 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2188                 SCTP_SOCKET_UNLOCK(so, 1);
2189 #endif
2190                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2191                 return (NULL);
2192         }
2193         /* load all addresses */
2194         if (sctp_load_addresses_from_init(stcb, m,
2195             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2196             src, dst, init_src)) {
2197                 atomic_add_int(&stcb->asoc.refcnt, 1);
2198 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2199                 SCTP_TCB_UNLOCK(stcb);
2200                 SCTP_SOCKET_LOCK(so, 1);
2201                 SCTP_TCB_LOCK(stcb);
2202 #endif
2203                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2204                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2205 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2206                 SCTP_SOCKET_UNLOCK(so, 1);
2207 #endif
2208                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2209                 return (NULL);
2210         }
2211         /*
2212          * verify any preceding AUTH chunk that was skipped
2213          */
2214         /* pull the local authentication parameters from the cookie/init-ack */
2215         sctp_auth_get_cookie_params(stcb, m,
2216             initack_offset + sizeof(struct sctp_init_ack_chunk),
2217             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2218         if (auth_skipped) {
2219                 struct sctp_auth_chunk *auth;
2220
2221                 auth = (struct sctp_auth_chunk *)
2222                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2223                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2224                         /* auth HMAC failed, dump the assoc and packet */
2225                         SCTPDBG(SCTP_DEBUG_AUTH1,
2226                             "COOKIE-ECHO: AUTH failed\n");
2227                         atomic_add_int(&stcb->asoc.refcnt, 1);
2228 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2229                         SCTP_TCB_UNLOCK(stcb);
2230                         SCTP_SOCKET_LOCK(so, 1);
2231                         SCTP_TCB_LOCK(stcb);
2232 #endif
2233                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2234                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2236                         SCTP_SOCKET_UNLOCK(so, 1);
2237 #endif
2238                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2239                         return (NULL);
2240                 } else {
2241                         /* remaining chunks checked... good to go */
2242                         stcb->asoc.authenticated = 1;
2243                 }
2244         }
2245         /* update current state */
2246         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2247         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2248         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2249                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2250                     stcb->sctp_ep, stcb, asoc->primary_destination);
2251         }
2252         sctp_stop_all_cookie_timers(stcb);
2253         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2254         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2255
2256         /*
2257          * if we're doing ASCONFs, check to see if we have any new local
2258          * addresses that need to get added to the peer (eg. addresses
2259          * changed while cookie echo in flight).  This needs to be done
2260          * after we go to the OPEN state to do the correct asconf
2261          * processing. else, make sure we have the correct addresses in our
2262          * lists
2263          */
2264
2265         /* warning, we re-use sin, sin6, sa_store here! */
2266         /* pull in local_address (our "from" address) */
2267         switch (cookie->laddr_type) {
2268 #ifdef INET
2269         case SCTP_IPV4_ADDRESS:
2270                 /* source addr is IPv4 */
2271                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2272                 store.sin.sin_family = AF_INET;
2273                 store.sin.sin_len = sizeof(struct sockaddr_in);
2274                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2275                 break;
2276 #endif
2277 #ifdef INET6
2278         case SCTP_IPV6_ADDRESS:
2279                 /* source addr is IPv6 */
2280                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2281                 store.sin6.sin6_family = AF_INET6;
2282                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2283                 store.sin6.sin6_scope_id = cookie->scope_id;
2284                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2285                 break;
2286 #endif
2287         default:
2288                 atomic_add_int(&stcb->asoc.refcnt, 1);
2289 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2290                 SCTP_TCB_UNLOCK(stcb);
2291                 SCTP_SOCKET_LOCK(so, 1);
2292                 SCTP_TCB_LOCK(stcb);
2293 #endif
2294                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2295                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2296 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2297                 SCTP_SOCKET_UNLOCK(so, 1);
2298 #endif
2299                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2300                 return (NULL);
2301         }
2302
2303         /* set up to notify upper layer */
2304         *notification = SCTP_NOTIFY_ASSOC_UP;
2305         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2306             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2307             (inp->sctp_socket->so_qlimit == 0)) {
2308                 /*
2309                  * This is an endpoint that called connect() how it got a
2310                  * cookie that is NEW is a bit of a mystery. It must be that
2311                  * the INIT was sent, but before it got there.. a complete
2312                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2313                  * should have went to the other code.. not here.. oh well..
2314                  * a bit of protection is worth having..
2315                  */
2316                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2317 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2318                 atomic_add_int(&stcb->asoc.refcnt, 1);
2319                 SCTP_TCB_UNLOCK(stcb);
2320                 SCTP_SOCKET_LOCK(so, 1);
2321                 SCTP_TCB_LOCK(stcb);
2322                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2323                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2324                         SCTP_SOCKET_UNLOCK(so, 1);
2325                         return (NULL);
2326                 }
2327 #endif
2328                 soisconnected(stcb->sctp_socket);
2329 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2330                 SCTP_SOCKET_UNLOCK(so, 1);
2331 #endif
2332         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2333             (inp->sctp_socket->so_qlimit)) {
2334                 /*
2335                  * We don't want to do anything with this one. Since it is
2336                  * the listening guy. The timer will get started for
2337                  * accepted connections in the caller.
2338                  */
2339                 ;
2340         }
2341         /* since we did not send a HB make sure we don't double things */
2342         if ((netp) && (*netp))
2343                 (*netp)->hb_responded = 1;
2344
2345         if (stcb->asoc.sctp_autoclose_ticks &&
2346             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2347                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2348         }
2349         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2350         if ((netp) && (*netp)) {
2351                 /* calculate the RTT and set the encaps port */
2352                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2353                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2354                     SCTP_RTT_FROM_NON_DATA);
2355                 (*netp)->port = port;
2356         }
2357         /* respond with a COOKIE-ACK */
2358         sctp_send_cookie_ack(stcb);
2359
2360         /*
2361          * check the address lists for any ASCONFs that need to be sent
2362          * AFTER the cookie-ack is sent
2363          */
2364         sctp_check_address_list(stcb, m,
2365             initack_offset + sizeof(struct sctp_init_ack_chunk),
2366             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2367             &store.sa, cookie->local_scope, cookie->site_scope,
2368             cookie->ipv4_scope, cookie->loopback_scope);
2369
2370
2371         return (stcb);
2372 }
2373
2374 /*
2375  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2376  * we NEED to make sure we are not already using the vtag. If so we
2377  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2378         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2379                                                             SCTP_BASE_INFO(hashasocmark))];
2380         LIST_FOREACH(stcb, head, sctp_asocs) {
2381                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2382                        -- SEND ABORT - TRY AGAIN --
2383                 }
2384         }
2385 */
2386
2387 /*
2388  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2389  * existing (non-NULL) TCB
2390  */
2391 static struct mbuf *
2392 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2393     struct sockaddr *src, struct sockaddr *dst,
2394     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2395     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2396     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2397     struct sctp_tcb **locked_tcb,
2398     uint8_t mflowtype, uint32_t mflowid,
2399     uint32_t vrf_id, uint16_t port)
2400 {
2401         struct sctp_state_cookie *cookie;
2402         struct sctp_tcb *l_stcb = *stcb;
2403         struct sctp_inpcb *l_inp;
2404         struct sockaddr *to;
2405         struct sctp_pcb *ep;
2406         struct mbuf *m_sig;
2407         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2408         uint8_t *sig;
2409         uint8_t cookie_ok = 0;
2410         unsigned int sig_offset, cookie_offset;
2411         unsigned int cookie_len;
2412         struct timeval now;
2413         struct timeval time_expires;
2414         int notification = 0;
2415         struct sctp_nets *netl;
2416         int had_a_existing_tcb = 0;
2417         int send_int_conf = 0;
2418
2419 #ifdef INET
2420         struct sockaddr_in sin;
2421
2422 #endif
2423 #ifdef INET6
2424         struct sockaddr_in6 sin6;
2425
2426 #endif
2427
2428         SCTPDBG(SCTP_DEBUG_INPUT2,
2429             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2430
2431         if (inp_p == NULL) {
2432                 return (NULL);
2433         }
2434         cookie = &cp->cookie;
2435         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2436         cookie_len = ntohs(cp->ch.chunk_length);
2437
2438         if ((cookie->peerport != sh->src_port) &&
2439             (cookie->myport != sh->dest_port) &&
2440             (cookie->my_vtag != sh->v_tag)) {
2441                 /*
2442                  * invalid ports or bad tag.  Note that we always leave the
2443                  * v_tag in the header in network order and when we stored
2444                  * it in the my_vtag slot we also left it in network order.
2445                  * This maintains the match even though it may be in the
2446                  * opposite byte order of the machine :->
2447                  */
2448                 return (NULL);
2449         }
2450         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2451             sizeof(struct sctp_init_chunk) +
2452             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2453                 /* cookie too small */
2454                 return (NULL);
2455         }
2456         /*
2457          * split off the signature into its own mbuf (since it should not be
2458          * calculated in the sctp_hmac_m() call).
2459          */
2460         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2461         m_sig = m_split(m, sig_offset, M_NOWAIT);
2462         if (m_sig == NULL) {
2463                 /* out of memory or ?? */
2464                 return (NULL);
2465         }
2466 #ifdef SCTP_MBUF_LOGGING
2467         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2468                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2469         }
2470 #endif
2471
2472         /*
2473          * compute the signature/digest for the cookie
2474          */
2475         ep = &(*inp_p)->sctp_ep;
2476         l_inp = *inp_p;
2477         if (l_stcb) {
2478                 SCTP_TCB_UNLOCK(l_stcb);
2479         }
2480         SCTP_INP_RLOCK(l_inp);
2481         if (l_stcb) {
2482                 SCTP_TCB_LOCK(l_stcb);
2483         }
2484         /* which cookie is it? */
2485         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2486             (ep->current_secret_number != ep->last_secret_number)) {
2487                 /* it's the old cookie */
2488                 (void)sctp_hmac_m(SCTP_HMAC,
2489                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2490                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2491         } else {
2492                 /* it's the current cookie */
2493                 (void)sctp_hmac_m(SCTP_HMAC,
2494                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2495                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2496         }
2497         /* get the signature */
2498         SCTP_INP_RUNLOCK(l_inp);
2499         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2500         if (sig == NULL) {
2501                 /* couldn't find signature */
2502                 sctp_m_freem(m_sig);
2503                 return (NULL);
2504         }
2505         /* compare the received digest with the computed digest */
2506         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2507                 /* try the old cookie? */
2508                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2509                     (ep->current_secret_number != ep->last_secret_number)) {
2510                         /* compute digest with old */
2511                         (void)sctp_hmac_m(SCTP_HMAC,
2512                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2513                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2514                         /* compare */
2515                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2516                                 cookie_ok = 1;
2517                 }
2518         } else {
2519                 cookie_ok = 1;
2520         }
2521
2522         /*
2523          * Now before we continue we must reconstruct our mbuf so that
2524          * normal processing of any other chunks will work.
2525          */
2526         {
2527                 struct mbuf *m_at;
2528
2529                 m_at = m;
2530                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2531                         m_at = SCTP_BUF_NEXT(m_at);
2532                 }
2533                 SCTP_BUF_NEXT(m_at) = m_sig;
2534         }
2535
2536         if (cookie_ok == 0) {
2537                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2538                 SCTPDBG(SCTP_DEBUG_INPUT2,
2539                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2540                     (uint32_t) offset, cookie_offset, sig_offset);
2541                 return (NULL);
2542         }
2543         /*
2544          * check the cookie timestamps to be sure it's not stale
2545          */
2546         (void)SCTP_GETTIME_TIMEVAL(&now);
2547         /* Expire time is in Ticks, so we convert to seconds */
2548         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2549         time_expires.tv_usec = cookie->time_entered.tv_usec;
2550         /*
2551          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2552          * is undefined.
2553          */
2554         if (timevalcmp(&now, &time_expires, >)) {
2555                 /* cookie is stale! */
2556                 struct mbuf *op_err;
2557                 struct sctp_error_stale_cookie *cause;
2558                 uint32_t tim;
2559
2560                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2561                     0, M_NOWAIT, 1, MT_DATA);
2562                 if (op_err == NULL) {
2563                         /* FOOBAR */
2564                         return (NULL);
2565                 }
2566                 /* Set the len */
2567                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2568                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2569                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2570                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2571                     (sizeof(uint32_t))));
2572                 /* seconds to usec */
2573                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2574                 /* add in usec */
2575                 if (tim == 0)
2576                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2577                 cause->stale_time = htonl(tim);
2578                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2579                     mflowtype, mflowid, l_inp->fibnum,
2580                     vrf_id, port);
2581                 return (NULL);
2582         }
2583         /*
2584          * Now we must see with the lookup address if we have an existing
2585          * asoc. This will only happen if we were in the COOKIE-WAIT state
2586          * and a INIT collided with us and somewhere the peer sent the
2587          * cookie on another address besides the single address our assoc
2588          * had for him. In this case we will have one of the tie-tags set at
2589          * least AND the address field in the cookie can be used to look it
2590          * up.
2591          */
2592         to = NULL;
2593         switch (cookie->addr_type) {
2594 #ifdef INET6
2595         case SCTP_IPV6_ADDRESS:
2596                 memset(&sin6, 0, sizeof(sin6));
2597                 sin6.sin6_family = AF_INET6;
2598                 sin6.sin6_len = sizeof(sin6);
2599                 sin6.sin6_port = sh->src_port;
2600                 sin6.sin6_scope_id = cookie->scope_id;
2601                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2602                     sizeof(sin6.sin6_addr.s6_addr));
2603                 to = (struct sockaddr *)&sin6;
2604                 break;
2605 #endif
2606 #ifdef INET
2607         case SCTP_IPV4_ADDRESS:
2608                 memset(&sin, 0, sizeof(sin));
2609                 sin.sin_family = AF_INET;
2610                 sin.sin_len = sizeof(sin);
2611                 sin.sin_port = sh->src_port;
2612                 sin.sin_addr.s_addr = cookie->address[0];
2613                 to = (struct sockaddr *)&sin;
2614                 break;
2615 #endif
2616         default:
2617                 /* This should not happen */
2618                 return (NULL);
2619         }
2620         if (*stcb == NULL) {
2621                 /* Yep, lets check */
2622                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2623                 if (*stcb == NULL) {
2624                         /*
2625                          * We should have only got back the same inp. If we
2626                          * got back a different ep we have a problem. The
2627                          * original findep got back l_inp and now
2628                          */
2629                         if (l_inp != *inp_p) {
2630                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2631                         }
2632                 } else {
2633                         if (*locked_tcb == NULL) {
2634                                 /*
2635                                  * In this case we found the assoc only
2636                                  * after we locked the create lock. This
2637                                  * means we are in a colliding case and we
2638                                  * must make sure that we unlock the tcb if
2639                                  * its one of the cases where we throw away
2640                                  * the incoming packets.
2641                                  */
2642                                 *locked_tcb = *stcb;
2643
2644                                 /*
2645                                  * We must also increment the inp ref count
2646                                  * since the ref_count flags was set when we
2647                                  * did not find the TCB, now we found it
2648                                  * which reduces the refcount.. we must
2649                                  * raise it back out to balance it all :-)
2650                                  */
2651                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2652                                 if ((*stcb)->sctp_ep != l_inp) {
2653                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2654                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2655                                 }
2656                         }
2657                 }
2658         }
2659         cookie_len -= SCTP_SIGNATURE_SIZE;
2660         if (*stcb == NULL) {
2661                 /* this is the "normal" case... get a new TCB */
2662                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2663                     cookie, cookie_len, *inp_p,
2664                     netp, to, &notification,
2665                     auth_skipped, auth_offset, auth_len,
2666                     mflowtype, mflowid,
2667                     vrf_id, port);
2668         } else {
2669                 /* this is abnormal... cookie-echo on existing TCB */
2670                 had_a_existing_tcb = 1;
2671                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2672                     src, dst, sh,
2673                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2674                     &notification, auth_skipped, auth_offset, auth_len,
2675                     mflowtype, mflowid,
2676                     vrf_id, port);
2677         }
2678
2679         if (*stcb == NULL) {
2680                 /* still no TCB... must be bad cookie-echo */
2681                 return (NULL);
2682         }
2683         if (*netp != NULL) {
2684                 (*netp)->flowtype = mflowtype;
2685                 (*netp)->flowid = mflowid;
2686         }
2687         /*
2688          * Ok, we built an association so confirm the address we sent the
2689          * INIT-ACK to.
2690          */
2691         netl = sctp_findnet(*stcb, to);
2692         /*
2693          * This code should in theory NOT run but
2694          */
2695         if (netl == NULL) {
2696                 /* TSNH! Huh, why do I need to add this address here? */
2697                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2698                         return (NULL);
2699                 }
2700                 netl = sctp_findnet(*stcb, to);
2701         }
2702         if (netl) {
2703                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2704                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2705                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2706                             netl);
2707                         send_int_conf = 1;
2708                 }
2709         }
2710         sctp_start_net_timers(*stcb);
2711         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2712                 if (!had_a_existing_tcb ||
2713                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2714                         /*
2715                          * If we have a NEW cookie or the connect never
2716                          * reached the connected state during collision we
2717                          * must do the TCP accept thing.
2718                          */
2719                         struct socket *so, *oso;
2720                         struct sctp_inpcb *inp;
2721
2722                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2723                                 /*
2724                                  * For a restart we will keep the same
2725                                  * socket, no need to do anything. I THINK!!
2726                                  */
2727                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2728                                 if (send_int_conf) {
2729                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2730                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2731                                 }
2732                                 return (m);
2733                         }
2734                         oso = (*inp_p)->sctp_socket;
2735                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2736                         SCTP_TCB_UNLOCK((*stcb));
2737                         CURVNET_SET(oso->so_vnet);
2738                         so = sonewconn(oso, 0
2739                             );
2740                         CURVNET_RESTORE();
2741                         SCTP_TCB_LOCK((*stcb));
2742                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2743
2744                         if (so == NULL) {
2745                                 struct mbuf *op_err;
2746
2747 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2748                                 struct socket *pcb_so;
2749
2750 #endif
2751                                 /* Too many sockets */
2752                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2753                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2754                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2755                                     src, dst, sh, op_err,
2756                                     mflowtype, mflowid,
2757                                     vrf_id, port);
2758 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2759                                 pcb_so = SCTP_INP_SO(*inp_p);
2760                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2761                                 SCTP_TCB_UNLOCK((*stcb));
2762                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2763                                 SCTP_TCB_LOCK((*stcb));
2764                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2765 #endif
2766                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2767                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2768 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2769                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2770 #endif
2771                                 return (NULL);
2772                         }
2773                         inp = (struct sctp_inpcb *)so->so_pcb;
2774                         SCTP_INP_INCR_REF(inp);
2775                         /*
2776                          * We add the unbound flag here so that if we get an
2777                          * soabort() before we get the move_pcb done, we
2778                          * will properly cleanup.
2779                          */
2780                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2781                             SCTP_PCB_FLAGS_CONNECTED |
2782                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2783                             SCTP_PCB_FLAGS_UNBOUND |
2784                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2785                             SCTP_PCB_FLAGS_DONT_WAKE);
2786                         inp->sctp_features = (*inp_p)->sctp_features;
2787                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2788                         inp->sctp_socket = so;
2789                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2790                         inp->max_cwnd = (*inp_p)->max_cwnd;
2791                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2792                         inp->ecn_supported = (*inp_p)->ecn_supported;
2793                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2794                         inp->auth_supported = (*inp_p)->auth_supported;
2795                         inp->asconf_supported = (*inp_p)->asconf_supported;
2796                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2797                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2798                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2799                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2800                         inp->sctp_context = (*inp_p)->sctp_context;
2801                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2802                         inp->fibnum = (*inp_p)->fibnum;
2803                         inp->inp_starting_point_for_iterator = NULL;
2804                         /*
2805                          * copy in the authentication parameters from the
2806                          * original endpoint
2807                          */
2808                         if (inp->sctp_ep.local_hmacs)
2809                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2810                         inp->sctp_ep.local_hmacs =
2811                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2812                         if (inp->sctp_ep.local_auth_chunks)
2813                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2814                         inp->sctp_ep.local_auth_chunks =
2815                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2816
2817                         /*
2818                          * Now we must move it from one hash table to
2819                          * another and get the tcb in the right place.
2820                          */
2821
2822                         /*
2823                          * This is where the one-2-one socket is put into
2824                          * the accept state waiting for the accept!
2825                          */
2826                         if (*stcb) {
2827                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2828                         }
2829                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2830
2831                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2832                         SCTP_TCB_UNLOCK((*stcb));
2833
2834                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2835                             0);
2836                         SCTP_TCB_LOCK((*stcb));
2837                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2838
2839
2840                         /*
2841                          * now we must check to see if we were aborted while
2842                          * the move was going on and the lock/unlock
2843                          * happened.
2844                          */
2845                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2846                                 /*
2847                                  * yep it was, we leave the assoc attached
2848                                  * to the socket since the sctp_inpcb_free()
2849                                  * call will send an abort for us.
2850                                  */
2851                                 SCTP_INP_DECR_REF(inp);
2852                                 return (NULL);
2853                         }
2854                         SCTP_INP_DECR_REF(inp);
2855                         /* Switch over to the new guy */
2856                         *inp_p = inp;
2857                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2858                         if (send_int_conf) {
2859                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2860                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2861                         }
2862                         /*
2863                          * Pull it from the incomplete queue and wake the
2864                          * guy
2865                          */
2866 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2867                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2868                         SCTP_TCB_UNLOCK((*stcb));
2869                         SCTP_SOCKET_LOCK(so, 1);
2870 #endif
2871                         soisconnected(so);
2872 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2873                         SCTP_TCB_LOCK((*stcb));
2874                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2875                         SCTP_SOCKET_UNLOCK(so, 1);
2876 #endif
2877                         return (m);
2878                 }
2879         }
2880         if (notification) {
2881                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2882         }
2883         if (send_int_conf) {
2884                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2885                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2886         }
2887         return (m);
2888 }
2889
2890 static void
2891 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2892     struct sctp_tcb *stcb, struct sctp_nets *net)
2893 {
2894         /* cp must not be used, others call this without a c-ack :-) */
2895         struct sctp_association *asoc;
2896
2897         SCTPDBG(SCTP_DEBUG_INPUT2,
2898             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2899         if ((stcb == NULL) || (net == NULL)) {
2900                 return;
2901         }
2902         asoc = &stcb->asoc;
2903
2904         sctp_stop_all_cookie_timers(stcb);
2905         /* process according to association state */
2906         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2907                 /* state change only needed when I am in right state */
2908                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2909                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2910                 sctp_start_net_timers(stcb);
2911                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2912                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2913                             stcb->sctp_ep, stcb, asoc->primary_destination);
2914
2915                 }
2916                 /* update RTO */
2917                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2918                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2919                 if (asoc->overall_error_count == 0) {
2920                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2921                             &asoc->time_entered, sctp_align_safe_nocopy,
2922                             SCTP_RTT_FROM_NON_DATA);
2923                 }
2924                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2925                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2926                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2927                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2928 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2929                         struct socket *so;
2930
2931 #endif
2932                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2933 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2934                         so = SCTP_INP_SO(stcb->sctp_ep);
2935                         atomic_add_int(&stcb->asoc.refcnt, 1);
2936                         SCTP_TCB_UNLOCK(stcb);
2937                         SCTP_SOCKET_LOCK(so, 1);
2938                         SCTP_TCB_LOCK(stcb);
2939                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2940 #endif
2941                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2942                                 soisconnected(stcb->sctp_socket);
2943                         }
2944 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2945                         SCTP_SOCKET_UNLOCK(so, 1);
2946 #endif
2947                 }
2948                 /*
2949                  * since we did not send a HB make sure we don't double
2950                  * things
2951                  */
2952                 net->hb_responded = 1;
2953
2954                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2955                         /*
2956                          * We don't need to do the asconf thing, nor hb or
2957                          * autoclose if the socket is closed.
2958                          */
2959                         goto closed_socket;
2960                 }
2961                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2962                     stcb, net);
2963
2964
2965                 if (stcb->asoc.sctp_autoclose_ticks &&
2966                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2967                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2968                             stcb->sctp_ep, stcb, NULL);
2969                 }
2970                 /*
2971                  * send ASCONF if parameters are pending and ASCONFs are
2972                  * allowed (eg. addresses changed when init/cookie echo were
2973                  * in flight)
2974                  */
2975                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2976                     (stcb->asoc.asconf_supported == 1) &&
2977                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2978 #ifdef SCTP_TIMER_BASED_ASCONF
2979                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2980                             stcb->sctp_ep, stcb,
2981                             stcb->asoc.primary_destination);
2982 #else
2983                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2984                             SCTP_ADDR_NOT_LOCKED);
2985 #endif
2986                 }
2987         }
2988 closed_socket:
2989         /* Toss the cookie if I can */
2990         sctp_toss_old_cookies(stcb, asoc);
2991         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2992                 /* Restart the timer if we have pending data */
2993                 struct sctp_tmit_chunk *chk;
2994
2995                 chk = TAILQ_FIRST(&asoc->sent_queue);
2996                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2997         }
2998 }
2999
3000 static void
3001 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3002     struct sctp_tcb *stcb)
3003 {
3004         struct sctp_nets *net;
3005         struct sctp_tmit_chunk *lchk;
3006         struct sctp_ecne_chunk bkup;
3007         uint8_t override_bit;
3008         uint32_t tsn, window_data_tsn;
3009         int len;
3010         unsigned int pkt_cnt;
3011
3012         len = ntohs(cp->ch.chunk_length);
3013         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3014             (len != sizeof(struct old_sctp_ecne_chunk))) {
3015                 return;
3016         }
3017         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3018                 /* Its the old format */
3019                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3020                 bkup.num_pkts_since_cwr = htonl(1);
3021                 cp = &bkup;
3022         }
3023         SCTP_STAT_INCR(sctps_recvecne);
3024         tsn = ntohl(cp->tsn);
3025         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3026         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3027         if (lchk == NULL) {
3028                 window_data_tsn = stcb->asoc.sending_seq - 1;
3029         } else {
3030                 window_data_tsn = lchk->rec.data.TSN_seq;
3031         }
3032
3033         /* Find where it was sent to if possible. */
3034         net = NULL;
3035         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3036                 if (lchk->rec.data.TSN_seq == tsn) {
3037                         net = lchk->whoTo;
3038                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3039                         break;
3040                 }
3041                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3042                         break;
3043                 }
3044         }
3045         if (net == NULL) {
3046                 /*
3047                  * What to do. A previous send of a CWR was possibly lost.
3048                  * See how old it is, we may have it marked on the actual
3049                  * net.
3050                  */
3051                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3052                         if (tsn == net->last_cwr_tsn) {
3053                                 /* Found him, send it off */
3054                                 break;
3055                         }
3056                 }
3057                 if (net == NULL) {
3058                         /*
3059                          * If we reach here, we need to send a special CWR
3060                          * that says hey, we did this a long time ago and
3061                          * you lost the response.
3062                          */
3063                         net = TAILQ_FIRST(&stcb->asoc.nets);
3064                         if (net == NULL) {
3065                                 /* TSNH */
3066                                 return;
3067                         }
3068                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3069                 } else {
3070                         override_bit = 0;
3071                 }
3072         } else {
3073                 override_bit = 0;
3074         }
3075         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3076             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3077                 /*
3078                  * JRS - Use the congestion control given in the pluggable
3079                  * CC module
3080                  */
3081                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3082                 /*
3083                  * We reduce once every RTT. So we will only lower cwnd at
3084                  * the next sending seq i.e. the window_data_tsn
3085                  */
3086                 net->cwr_window_tsn = window_data_tsn;
3087                 net->ecn_ce_pkt_cnt += pkt_cnt;
3088                 net->lost_cnt = pkt_cnt;
3089                 net->last_cwr_tsn = tsn;
3090         } else {
3091                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3092                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3093                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3094                         /*
3095                          * Another loss in the same window update how many
3096                          * marks/packets lost we have had.
3097                          */
3098                         int cnt = 1;
3099
3100                         if (pkt_cnt > net->lost_cnt) {
3101                                 /* Should be the case */
3102                                 cnt = (pkt_cnt - net->lost_cnt);
3103                                 net->ecn_ce_pkt_cnt += cnt;
3104                         }
3105                         net->lost_cnt = pkt_cnt;
3106                         net->last_cwr_tsn = tsn;
3107                         /*
3108                          * Most CC functions will ignore this call, since we
3109                          * are in-window yet of the initial CE the peer saw.
3110                          */
3111                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3112                 }
3113         }
3114         /*
3115          * We always send a CWR this way if our previous one was lost our
3116          * peer will get an update, or if it is not time again to reduce we
3117          * still get the cwr to the peer. Note we set the override when we
3118          * could not find the TSN on the chunk or the destination network.
3119          */
3120         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3121 }
3122
3123 static void
3124 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3125 {
3126         /*
3127          * Here we get a CWR from the peer. We must look in the outqueue and
3128          * make sure that we have a covered ECNE in the control chunk part.
3129          * If so remove it.
3130          */
3131         struct sctp_tmit_chunk *chk;
3132         struct sctp_ecne_chunk *ecne;
3133         int override;
3134         uint32_t cwr_tsn;
3135
3136         cwr_tsn = ntohl(cp->tsn);
3137         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3138         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3139                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3140                         continue;
3141                 }
3142                 if ((override == 0) && (chk->whoTo != net)) {
3143                         /* Must be from the right src unless override is set */
3144                         continue;
3145                 }
3146                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3147                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3148                         /* this covers this ECNE, we can remove it */
3149                         stcb->asoc.ecn_echo_cnt_onq--;
3150                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3151                             sctp_next);
3152                         sctp_m_freem(chk->data);
3153                         chk->data = NULL;
3154                         stcb->asoc.ctrl_queue_cnt--;
3155                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3156                         if (override == 0) {
3157                                 break;
3158                         }
3159                 }
3160         }
3161 }
3162
3163 static void
3164 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3165     struct sctp_tcb *stcb, struct sctp_nets *net)
3166 {
3167         struct sctp_association *asoc;
3168
3169 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3170         struct socket *so;
3171
3172 #endif
3173
3174         SCTPDBG(SCTP_DEBUG_INPUT2,
3175             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3176         if (stcb == NULL)
3177                 return;
3178
3179         asoc = &stcb->asoc;
3180         /* process according to association state */
3181         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3182                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3183                 SCTPDBG(SCTP_DEBUG_INPUT2,
3184                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3185                 SCTP_TCB_UNLOCK(stcb);
3186                 return;
3187         }
3188         /* notify upper layer protocol */
3189         if (stcb->sctp_socket) {
3190                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3191         }
3192 #ifdef INVARIANTS
3193         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3194             !TAILQ_EMPTY(&asoc->sent_queue) ||
3195             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3196                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3197         }
3198 #endif
3199         /* stop the timer */
3200         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3201             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3202         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3203         /* free the TCB */
3204         SCTPDBG(SCTP_DEBUG_INPUT2,
3205             "sctp_handle_shutdown_complete: calls free-asoc\n");
3206 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3207         so = SCTP_INP_SO(stcb->sctp_ep);
3208         atomic_add_int(&stcb->asoc.refcnt, 1);
3209         SCTP_TCB_UNLOCK(stcb);
3210         SCTP_SOCKET_LOCK(so, 1);
3211         SCTP_TCB_LOCK(stcb);
3212         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3213 #endif
3214         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3215             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3216 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3217         SCTP_SOCKET_UNLOCK(so, 1);
3218 #endif
3219         return;
3220 }
3221
3222 static int
3223 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3224     struct sctp_nets *net, uint8_t flg)
3225 {
3226         switch (desc->chunk_type) {
3227         case SCTP_DATA:
3228                 /* find the tsn to resend (possibly */
3229                 {
3230                         uint32_t tsn;
3231                         struct sctp_tmit_chunk *tp1;
3232
3233                         tsn = ntohl(desc->tsn_ifany);
3234                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3235                                 if (tp1->rec.data.TSN_seq == tsn) {
3236                                         /* found it */
3237                                         break;
3238                                 }
3239                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3240                                         /* not found */
3241                                         tp1 = NULL;
3242                                         break;
3243                                 }
3244                         }
3245                         if (tp1 == NULL) {
3246                                 /*
3247                                  * Do it the other way , aka without paying
3248                                  * attention to queue seq order.
3249                                  */
3250                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3251                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3252                                         if (tp1->rec.data.TSN_seq == tsn) {
3253                                                 /* found it */
3254                                                 break;
3255                                         }
3256                                 }
3257                         }
3258                         if (tp1 == NULL) {
3259                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3260                         }
3261                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3262                                 uint8_t *ddp;
3263
3264                                 if (((flg & SCTP_BADCRC) == 0) &&
3265                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3266                                         return (0);
3267                                 }
3268                                 if ((stcb->asoc.peers_rwnd == 0) &&
3269                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3270                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3271                                         return (0);
3272                                 }
3273                                 if (stcb->asoc.peers_rwnd == 0 &&
3274                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3275                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3276                                         return (0);
3277                                 }
3278                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3279                                     sizeof(struct sctp_data_chunk));
3280                                 {
3281                                         unsigned int iii;
3282
3283                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3284                                             iii++) {
3285                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3286                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3287                                                         return (-1);
3288                                                 }
3289                                         }
3290                                 }
3291
3292                                 if (tp1->do_rtt) {
3293                                         /*
3294                                          * this guy had a RTO calculation
3295                                          * pending on it, cancel it
3296                                          */
3297                                         if (tp1->whoTo->rto_needed == 0) {
3298                                                 tp1->whoTo->rto_needed = 1;
3299                                         }
3300                                         tp1->do_rtt = 0;
3301                                 }
3302                                 SCTP_STAT_INCR(sctps_pdrpmark);
3303                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3304                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3305                                 /*
3306                                  * mark it as if we were doing a FR, since
3307                                  * we will be getting gap ack reports behind
3308                                  * the info from the router.
3309                                  */
3310                                 tp1->rec.data.doing_fast_retransmit = 1;
3311                                 /*
3312                                  * mark the tsn with what sequences can
3313                                  * cause a new FR.
3314                                  */
3315                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3316                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3317                                 } else {
3318                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3319                                 }
3320
3321                                 /* restart the timer */
3322                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3323                                     stcb, tp1->whoTo,
3324                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3325                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3326                                     stcb, tp1->whoTo);
3327
3328                                 /* fix counts and things */
3329                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3330                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3331                                             tp1->whoTo->flight_size,
3332                                             tp1->book_size,
3333                                             (uintptr_t) stcb,
3334                                             tp1->rec.data.TSN_seq);
3335                                 }
3336                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3337                                         sctp_flight_size_decrease(tp1);
3338                                         sctp_total_flight_decrease(stcb, tp1);
3339                                 }
3340                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3341                         } {
3342                                 /* audit code */
3343                                 unsigned int audit;
3344
3345                                 audit = 0;
3346                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3347                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3348                                                 audit++;
3349                                 }
3350                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3351                                     sctp_next) {
3352                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3353                                                 audit++;
3354                                 }
3355                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3356                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3357                                             audit, stcb->asoc.sent_queue_retran_cnt);
3358 #ifndef SCTP_AUDITING_ENABLED
3359                                         stcb->asoc.sent_queue_retran_cnt = audit;
3360 #endif
3361                                 }
3362                         }
3363                 }
3364                 break;
3365         case SCTP_ASCONF:
3366                 {
3367                         struct sctp_tmit_chunk *asconf;
3368
3369                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3370                             sctp_next) {
3371                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3372                                         break;
3373                                 }
3374                         }
3375                         if (asconf) {
3376                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3377                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3378                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3379                                 asconf->snd_count--;
3380                         }
3381                 }
3382                 break;
3383         case SCTP_INITIATION:
3384                 /* resend the INIT */
3385                 stcb->asoc.dropped_special_cnt++;
3386                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3387                         /*
3388                          * If we can get it in, in a few attempts we do
3389                          * this, otherwise we let the timer fire.
3390                          */
3391                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3392                             stcb, net,
3393                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3394                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3395                 }
3396                 break;
3397         case SCTP_SELECTIVE_ACK:
3398         case SCTP_NR_SELECTIVE_ACK:
3399                 /* resend the sack */
3400                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3401                 break;
3402         case SCTP_HEARTBEAT_REQUEST:
3403                 /* resend a demand HB */
3404                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3405                         /*
3406                          * Only retransmit if we KNOW we wont destroy the
3407                          * tcb
3408                          */
3409                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3410                 }
3411                 break;
3412         case SCTP_SHUTDOWN:
3413                 sctp_send_shutdown(stcb, net);
3414                 break;
3415         case SCTP_SHUTDOWN_ACK:
3416                 sctp_send_shutdown_ack(stcb, net);
3417                 break;
3418         case SCTP_COOKIE_ECHO:
3419                 {
3420                         struct sctp_tmit_chunk *cookie;
3421
3422                         cookie = NULL;
3423                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3424                             sctp_next) {
3425                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3426                                         break;
3427                                 }
3428                         }
3429                         if (cookie) {
3430                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3431                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3432                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3433                                 sctp_stop_all_cookie_timers(stcb);
3434                         }
3435                 }
3436                 break;
3437         case SCTP_COOKIE_ACK:
3438                 sctp_send_cookie_ack(stcb);
3439                 break;
3440         case SCTP_ASCONF_ACK:
3441                 /* resend last asconf ack */
3442                 sctp_send_asconf_ack(stcb);
3443                 break;
3444         case SCTP_FORWARD_CUM_TSN:
3445                 send_forward_tsn(stcb, &stcb->asoc);
3446                 break;
3447                 /* can't do anything with these */
3448         case SCTP_PACKET_DROPPED:
3449         case SCTP_INITIATION_ACK:       /* this should not happen */
3450         case SCTP_HEARTBEAT_ACK:
3451         case SCTP_ABORT_ASSOCIATION:
3452         case SCTP_OPERATION_ERROR:
3453         case SCTP_SHUTDOWN_COMPLETE:
3454         case SCTP_ECN_ECHO:
3455         case SCTP_ECN_CWR:
3456         default:
3457                 break;
3458         }
3459         return (0);
3460 }
3461
3462 void
3463 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3464 {
3465         uint32_t i;
3466         uint16_t temp;
3467
3468         /*
3469          * We set things to 0xffff since this is the last delivered sequence
3470          * and we will be sending in 0 after the reset.
3471          */
3472
3473         if (number_entries) {
3474                 for (i = 0; i < number_entries; i++) {
3475                         temp = ntohs(list[i]);
3476                         if (temp >= stcb->asoc.streamincnt) {
3477                                 continue;
3478                         }
3479                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3480                 }
3481         } else {
3482                 list = NULL;
3483                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3484                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3485                 }
3486         }
3487         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3488 }
3489
3490 static void
3491 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3492 {
3493         uint32_t i;
3494         uint16_t temp;
3495
3496         if (number_entries > 0) {
3497                 for (i = 0; i < number_entries; i++) {
3498                         temp = ntohs(list[i]);
3499                         if (temp >= stcb->asoc.streamoutcnt) {
3500                                 /* no such stream */
3501                                 continue;
3502                         }
3503                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3504                 }
3505         } else {
3506                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3507                         stcb->asoc.strmout[i].next_sequence_send = 0;
3508                 }
3509         }
3510         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3511 }
3512
3513 static void
3514 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3515 {
3516         uint32_t i;
3517         uint16_t temp;
3518
3519         if (number_entries > 0) {
3520                 for (i = 0; i < number_entries; i++) {
3521                         temp = ntohs(list[i]);
3522                         if (temp >= stcb->asoc.streamoutcnt) {
3523                                 /* no such stream */
3524                                 continue;
3525                         }
3526                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3527                 }
3528         } else {
3529                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3530                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3531                 }
3532         }
3533 }
3534
3535
3536 struct sctp_stream_reset_request *
3537 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3538 {
3539         struct sctp_association *asoc;
3540         struct sctp_chunkhdr *ch;
3541         struct sctp_stream_reset_request *r;
3542         struct sctp_tmit_chunk *chk;
3543         int len, clen;
3544
3545         asoc = &stcb->asoc;
3546         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3547                 asoc->stream_reset_outstanding = 0;
3548                 return (NULL);
3549         }
3550         if (stcb->asoc.str_reset == NULL) {
3551                 asoc->stream_reset_outstanding = 0;
3552                 return (NULL);
3553         }
3554         chk = stcb->asoc.str_reset;
3555         if (chk->data == NULL) {
3556                 return (NULL);
3557         }
3558         if (bchk) {
3559                 /* he wants a copy of the chk pointer */
3560                 *bchk = chk;
3561         }
3562         clen = chk->send_size;
3563         ch = mtod(chk->data, struct sctp_chunkhdr *);
3564         r = (struct sctp_stream_reset_request *)(ch + 1);
3565         if (ntohl(r->request_seq) == seq) {
3566                 /* found it */
3567                 return (r);
3568         }
3569         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3570         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3571                 /* move to the next one, there can only be a max of two */
3572                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3573                 if (ntohl(r->request_seq) == seq) {
3574                         return (r);
3575                 }
3576         }
3577         /* that seq is not here */
3578         return (NULL);
3579 }
3580
3581 static void
3582 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3583 {
3584         struct sctp_association *asoc;
3585         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3586
3587         if (stcb->asoc.str_reset == NULL) {
3588                 return;
3589         }
3590         asoc = &stcb->asoc;
3591
3592         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3593             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3594         TAILQ_REMOVE(&asoc->control_send_queue,
3595             chk,
3596             sctp_next);
3597         if (chk->data) {
3598                 sctp_m_freem(chk->data);
3599                 chk->data = NULL;
3600         }
3601         asoc->ctrl_queue_cnt--;
3602         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3603         /* sa_ignore NO_NULL_CHK */
3604         stcb->asoc.str_reset = NULL;
3605 }
3606
3607
3608 static int
3609 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3610     uint32_t seq, uint32_t action,
3611     struct sctp_stream_reset_response *respin)
3612 {
3613         uint16_t type;
3614         int lparm_len;
3615         struct sctp_association *asoc = &stcb->asoc;
3616         struct sctp_tmit_chunk *chk;
3617         struct sctp_stream_reset_request *req_param;
3618         struct sctp_stream_reset_out_request *req_out_param;
3619         struct sctp_stream_reset_in_request *req_in_param;
3620         uint32_t number_entries;
3621
3622         if (asoc->stream_reset_outstanding == 0) {
3623                 /* duplicate */
3624                 return (0);
3625         }
3626         if (seq == stcb->asoc.str_reset_seq_out) {
3627                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3628                 if (req_param != NULL) {
3629                         stcb->asoc.str_reset_seq_out++;
3630                         type = ntohs(req_param->ph.param_type);
3631                         lparm_len = ntohs(req_param->ph.param_length);
3632                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3633                                 int no_clear = 0;
3634
3635                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3636                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3637                                 asoc->stream_reset_out_is_outstanding = 0;
3638                                 if (asoc->stream_reset_outstanding)
3639                                         asoc->stream_reset_outstanding--;
3640                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3641                                         /* do it */
3642                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3643                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3644                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3645                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3646                                         /*
3647                                          * Set it up so we don't stop
3648                                          * retransmitting
3649                                          */
3650                                         stcb->asoc.str_reset_seq_out--;
3651                                         asoc->stream_reset_out_is_outstanding = 1;
3652                                         no_clear = 1;
3653                                 } else {
3654                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3655                                 }
3656                                 if (no_clear == 0) {
3657                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3658                                 }
3659                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3660                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3661                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3662                                 if (asoc->stream_reset_outstanding)
3663                                         asoc->stream_reset_outstanding--;
3664                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3665                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3666                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3667                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3668                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3669                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3670                                 }
3671                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3672                                 /* Ok we now may have more streams */
3673                                 int num_stream;
3674
3675                                 num_stream = stcb->asoc.strm_pending_add_size;
3676                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3677                                         /* TSNH */
3678                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3679                                 }
3680                                 stcb->asoc.strm_pending_add_size = 0;
3681                                 if (asoc->stream_reset_outstanding)
3682                                         asoc->stream_reset_outstanding--;
3683                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3684                                         /* Put the new streams into effect */
3685                                         int i;
3686
3687                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3688                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3689                                         }
3690                                         asoc->streamoutcnt += num_stream;
3691                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3692                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3693                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3694                                             SCTP_STREAM_CHANGE_DENIED);
3695                                 } else {
3696                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3697                                             SCTP_STREAM_CHANGE_FAILED);
3698                                 }
3699                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3700                                 if (asoc->stream_reset_outstanding)
3701                                         asoc->stream_reset_outstanding--;
3702                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3703                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3704                                             SCTP_STREAM_CHANGE_DENIED);
3705                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3706                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3707                                             SCTP_STREAM_CHANGE_FAILED);
3708                                 }
3709                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3710                                 /**
3711                                  * a) Adopt the new in tsn.
3712                                  * b) reset the map
3713                                  * c) Adopt the new out-tsn
3714                                  */
3715                                 struct sctp_stream_reset_response_tsn *resp;
3716                                 struct sctp_forward_tsn_chunk fwdtsn;
3717                                 int abort_flag = 0;
3718
3719                                 if (respin == NULL) {
3720                                         /* huh ? */
3721                                         return (0);
3722                                 }
3723                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3724                                         return (0);
3725                                 }
3726                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3727                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3728                                         asoc->stream_reset_outstanding--;
3729                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3730                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3731                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3732                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3733                                         if (abort_flag) {
3734                                                 return (1);
3735                                         }
3736                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3737                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3738                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3739                                         }
3740                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3741                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3742                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3743
3744                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3745                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3746
3747                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3748                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3749
3750                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3751                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3752                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3753                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3754                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3755                                             SCTP_ASSOC_RESET_DENIED);
3756                                 } else {
3757                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3758                                             SCTP_ASSOC_RESET_FAILED);
3759                                 }
3760                         }
3761                         /* get rid of the request and get the request flags */
3762                         if (asoc->stream_reset_outstanding == 0) {
3763                                 sctp_clean_up_stream_reset(stcb);
3764                         }
3765                 }
3766         }
3767         if (asoc->stream_reset_outstanding == 0) {
3768                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3769         }
3770         return (0);
3771 }
3772
3773 static void
3774 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3775     struct sctp_tmit_chunk *chk,
3776     struct sctp_stream_reset_in_request *req, int trunc)
3777 {
3778         uint32_t seq;
3779         int len, i;
3780         int number_entries;
3781         uint16_t temp;
3782
3783         /*
3784          * peer wants me to send a str-reset to him for my outgoing seq's if
3785          * seq_in is right.
3786          */
3787         struct sctp_association *asoc = &stcb->asoc;
3788
3789         seq = ntohl(req->request_seq);
3790         if (asoc->str_reset_seq_in == seq) {
3791                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3792                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3793                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3794                 } else if (trunc) {
3795                         /* Can't do it, since they exceeded our buffer size  */
3796                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3797                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3798                         len = ntohs(req->ph.param_length);
3799                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3800                         if (number_entries) {
3801                                 for (i = 0; i < number_entries; i++) {
3802                                         temp = ntohs(req->list_of_streams[i]);
3803                                         if (temp >= stcb->asoc.streamoutcnt) {
3804                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3805                                                 goto bad_boy;
3806                                         }
3807                                         req->list_of_streams[i] = temp;
3808                                 }
3809                                 for (i = 0; i < number_entries; i++) {
3810                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3811                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3812                                         }
3813                                 }
3814                         } else {
3815                                 /* Its all */
3816                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3817                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3818                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3819                                 }
3820                         }
3821                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3822                 } else {
3823                         /* Can't do it, since we have sent one out */
3824                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3825                 }
3826 bad_boy:
3827                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3828                 asoc->str_reset_seq_in++;
3829         } else if (asoc->str_reset_seq_in - 1 == seq) {
3830                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3831         } else if (asoc->str_reset_seq_in - 2 == seq) {
3832                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3833         } else {
3834                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3835         }
3836         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3837 }
3838
3839 static int
3840 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3841     struct sctp_tmit_chunk *chk,
3842     struct sctp_stream_reset_tsn_request *req)
3843 {
3844         /* reset all in and out and update the tsn */
3845         /*
3846          * A) reset my str-seq's on in and out. B) Select a receive next,
3847          * and set cum-ack to it. Also process this selected number as a
3848          * fwd-tsn as well. C) set in the response my next sending seq.
3849          */
3850         struct sctp_forward_tsn_chunk fwdtsn;
3851         struct sctp_association *asoc = &stcb->asoc;
3852         int abort_flag = 0;
3853         uint32_t seq;
3854
3855         seq = ntohl(req->request_seq);
3856         if (asoc->str_reset_seq_in == seq) {
3857                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3858                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3859                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3860                 } else {
3861                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3862                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3863                         fwdtsn.ch.chunk_flags = 0;
3864                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3865                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3866                         if (abort_flag) {
3867                                 return (1);
3868                         }
3869                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3870                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3871                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3872                         }
3873                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3874                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3875                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3876                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3877                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3878                         atomic_add_int(&asoc->sending_seq, 1);
3879                         /* save off historical data for retrans */
3880                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3881                         asoc->last_sending_seq[0] = asoc->sending_seq;
3882                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3883                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3884                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3885                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3886                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3887                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3888                 }
3889                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3890                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3891                 asoc->str_reset_seq_in++;
3892         } else if (asoc->str_reset_seq_in - 1 == seq) {
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         } else if (asoc->str_reset_seq_in - 2 == seq) {
3896                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3897                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3898         } else {
3899                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3900         }
3901         return (0);
3902 }
3903
3904 static void
3905 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3906     struct sctp_tmit_chunk *chk,
3907     struct sctp_stream_reset_out_request *req, int trunc)
3908 {
3909         uint32_t seq, tsn;
3910         int number_entries, len;
3911         struct sctp_association *asoc = &stcb->asoc;
3912
3913         seq = ntohl(req->request_seq);
3914
3915         /* now if its not a duplicate we process it */
3916         if (asoc->str_reset_seq_in == seq) {
3917                 len = ntohs(req->ph.param_length);
3918                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3919                 /*
3920                  * the sender is resetting, handle the list issue.. we must
3921                  * a) verify if we can do the reset, if so no problem b) If
3922                  * we can't do the reset we must copy the request. c) queue
3923                  * it, and setup the data in processor to trigger it off
3924                  * when needed and dequeue all the queued data.
3925                  */
3926                 tsn = ntohl(req->send_reset_at_tsn);
3927
3928                 /* move the reset action back one */
3929                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3930                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3931                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3932                 } else if (trunc) {
3933                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3934                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3935                         /* we can do it now */
3936                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3937                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3938                 } else {
3939                         /*
3940                          * we must queue it up and thus wait for the TSN's
3941                          * to arrive that are at or before tsn
3942                          */
3943                         struct sctp_stream_reset_list *liste;
3944                         int siz;
3945
3946                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3947                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3948                             siz, SCTP_M_STRESET);
3949                         if (liste == NULL) {
3950                                 /* gak out of memory */
3951                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3952                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3953                                 return;
3954                         }
3955                         liste->seq = seq;
3956                         liste->tsn = tsn;
3957                         liste->number_entries = number_entries;
3958                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3959                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3960                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3961                 }
3962                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3963                 asoc->str_reset_seq_in++;
3964         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3965                 /*
3966                  * one seq back, just echo back last action since my
3967                  * response was lost.
3968                  */
3969                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3970         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3971                 /*
3972                  * two seq back, just echo back last action since my
3973                  * response was lost.
3974                  */
3975                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3976         } else {
3977                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3978         }
3979 }
3980
3981 static void
3982 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3983     struct sctp_stream_reset_add_strm *str_add)
3984 {
3985         /*
3986          * Peer is requesting to add more streams. If its within our
3987          * max-streams we will allow it.
3988          */
3989         uint32_t num_stream, i;
3990         uint32_t seq;
3991         struct sctp_association *asoc = &stcb->asoc;
3992         struct sctp_queued_to_read *ctl, *nctl;
3993
3994         /* Get the number. */
3995         seq = ntohl(str_add->request_seq);
3996         num_stream = ntohs(str_add->number_of_streams);
3997         /* Now what would be the new total? */
3998         if (asoc->str_reset_seq_in == seq) {
3999                 num_stream += stcb->asoc.streamincnt;
4000                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4001                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4002                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4003                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4004                     (num_stream > 0xffff)) {
4005                         /* We must reject it they ask for to many */
4006         denied:
4007                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4008                 } else {
4009                         /* Ok, we can do that :-) */
4010                         struct sctp_stream_in *oldstrm;
4011
4012                         /* save off the old */
4013                         oldstrm = stcb->asoc.strmin;
4014                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4015                             (num_stream * sizeof(struct sctp_stream_in)),
4016                             SCTP_M_STRMI);
4017                         if (stcb->asoc.strmin == NULL) {
4018                                 stcb->asoc.strmin = oldstrm;
4019                                 goto denied;
4020                         }
4021                         /* copy off the old data */
4022                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4023                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4024                                 stcb->asoc.strmin[i].stream_no = i;
4025                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
4026                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4027                                 /* now anything on those queues? */
4028                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
4029                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
4030                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
4031                                 }
4032                         }
4033                         /* Init the new streams */
4034                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4035                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4036                                 stcb->asoc.strmin[i].stream_no = i;
4037                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
4038                                 stcb->asoc.strmin[i].delivery_started = 0;
4039                         }
4040                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4041                         /* update the size */
4042                         stcb->asoc.streamincnt = num_stream;
4043                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4044                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4045                 }
4046                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4047                 asoc->str_reset_seq_in++;
4048         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4049                 /*
4050                  * one seq back, just echo back last action since my
4051                  * response was lost.
4052                  */
4053                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4054         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4055                 /*
4056                  * two seq back, just echo back last action since my
4057                  * response was lost.
4058                  */
4059                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4060         } else {
4061                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4062
4063         }
4064 }
4065
4066 static void
4067 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4068     struct sctp_stream_reset_add_strm *str_add)
4069 {
4070         /*
4071          * Peer is requesting to add more streams. If its within our
4072          * max-streams we will allow it.
4073          */
4074         uint16_t num_stream;
4075         uint32_t seq;
4076         struct sctp_association *asoc = &stcb->asoc;
4077
4078         /* Get the number. */
4079         seq = ntohl(str_add->request_seq);
4080         num_stream = ntohs(str_add->number_of_streams);
4081         /* Now what would be the new total? */
4082         if (asoc->str_reset_seq_in == seq) {
4083                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4084                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4085                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4086                 } else if (stcb->asoc.stream_reset_outstanding) {
4087                         /* We must reject it we have something pending */
4088                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4089                 } else {
4090                         /* Ok, we can do that :-) */
4091                         int mychk;
4092
4093                         mychk = stcb->asoc.streamoutcnt;
4094                         mychk += num_stream;
4095                         if (mychk < 0x10000) {
4096                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4097                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4098                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4099                                 }
4100                         } else {
4101                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4102                         }
4103                 }
4104                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4105                 asoc->str_reset_seq_in++;
4106         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4107                 /*
4108                  * one seq back, just echo back last action since my
4109                  * response was lost.
4110                  */
4111                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4112         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4113                 /*
4114                  * two seq back, just echo back last action since my
4115                  * response was lost.
4116                  */
4117                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4118         } else {
4119                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4120         }
4121 }
4122
4123 #ifdef __GNUC__
4124 __attribute__((noinline))
4125 #endif
4126         static int
4127             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4128         struct sctp_chunkhdr *ch_req)
4129 {
4130         uint16_t remaining_length, param_len, ptype;
4131         struct sctp_paramhdr pstore;
4132         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4133         uint32_t seq = 0;
4134         int num_req = 0;
4135         int trunc = 0;
4136         struct sctp_tmit_chunk *chk;
4137         struct sctp_chunkhdr *ch;
4138         struct sctp_paramhdr *ph;
4139         int ret_code = 0;
4140         int num_param = 0;
4141
4142         /* now it may be a reset or a reset-response */
4143         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4144
4145         /* setup for adding the response */
4146         sctp_alloc_a_chunk(stcb, chk);
4147         if (chk == NULL) {
4148                 return (ret_code);
4149         }
4150         chk->copy_by_ref = 0;
4151         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4152         chk->rec.chunk_id.can_take_data = 0;
4153         chk->flags = 0;
4154         chk->asoc = &stcb->asoc;
4155         chk->no_fr_allowed = 0;
4156         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4157         chk->book_size_scale = 0;
4158         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4159         if (chk->data == NULL) {
4160 strres_nochunk:
4161                 if (chk->data) {
4162                         sctp_m_freem(chk->data);
4163                         chk->data = NULL;
4164                 }
4165                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4166                 return (ret_code);
4167         }
4168         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4169
4170         /* setup chunk parameters */
4171         chk->sent = SCTP_DATAGRAM_UNSENT;
4172         chk->snd_count = 0;
4173         chk->whoTo = NULL;
4174
4175         ch = mtod(chk->data, struct sctp_chunkhdr *);
4176         ch->chunk_type = SCTP_STREAM_RESET;
4177         ch->chunk_flags = 0;
4178         ch->chunk_length = htons(chk->send_size);
4179         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4180         offset += sizeof(struct sctp_chunkhdr);
4181         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4182                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4183                 if (ph == NULL) {
4184                         /* TSNH */
4185                         break;
4186                 }
4187                 param_len = ntohs(ph->param_length);
4188                 if ((param_len > remaining_length) ||
4189                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4190                         /* bad parameter length */
4191                         break;
4192                 }
4193                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4194                     (uint8_t *) & cstore);
4195                 if (ph == NULL) {
4196                         /* TSNH */
4197                         break;
4198                 }
4199                 ptype = ntohs(ph->param_type);
4200                 num_param++;
4201                 if (param_len > sizeof(cstore)) {
4202                         trunc = 1;
4203                 } else {
4204                         trunc = 0;
4205                 }
4206                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4207                         /* hit the max of parameters already sorry.. */
4208                         break;
4209                 }
4210                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4211                         struct sctp_stream_reset_out_request *req_out;
4212
4213                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4214                                 break;
4215                         }
4216                         req_out = (struct sctp_stream_reset_out_request *)ph;
4217                         num_req++;
4218                         if (stcb->asoc.stream_reset_outstanding) {
4219                                 seq = ntohl(req_out->response_seq);
4220                                 if (seq == stcb->asoc.str_reset_seq_out) {
4221                                         /* implicit ack */
4222                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4223                                 }
4224                         }
4225                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4226                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4227                         struct sctp_stream_reset_add_strm *str_add;
4228
4229                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4230                                 break;
4231                         }
4232                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4233                         num_req++;
4234                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4235                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4236                         struct sctp_stream_reset_add_strm *str_add;
4237
4238                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4239                                 break;
4240                         }
4241                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4242                         num_req++;
4243                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4244                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4245                         struct sctp_stream_reset_in_request *req_in;
4246
4247                         num_req++;
4248                         req_in = (struct sctp_stream_reset_in_request *)ph;
4249                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4250                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4251                         struct sctp_stream_reset_tsn_request *req_tsn;
4252
4253                         num_req++;
4254                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4255                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4256                                 ret_code = 1;
4257                                 goto strres_nochunk;
4258                         }
4259                         /* no more */
4260                         break;
4261                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4262                         struct sctp_stream_reset_response *resp;
4263                         uint32_t result;
4264
4265                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4266                                 break;
4267                         }
4268                         resp = (struct sctp_stream_reset_response *)ph;
4269                         seq = ntohl(resp->response_seq);
4270                         result = ntohl(resp->result);
4271                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4272                                 ret_code = 1;
4273                                 goto strres_nochunk;
4274                         }
4275                 } else {
4276                         break;
4277                 }
4278                 offset += SCTP_SIZE32(param_len);
4279                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4280                         remaining_length -= SCTP_SIZE32(param_len);
4281                 } else {
4282                         remaining_length = 0;
4283                 }
4284         }
4285         if (num_req == 0) {
4286                 /* we have no response free the stuff */
4287                 goto strres_nochunk;
4288         }
4289         /* ok we have a chunk to link in */
4290         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4291             chk,
4292             sctp_next);
4293         stcb->asoc.ctrl_queue_cnt++;
4294         return (ret_code);
4295 }
4296
4297 /*
4298  * Handle a router or endpoints report of a packet loss, there are two ways
4299  * to handle this, either we get the whole packet and must disect it
4300  * ourselves (possibly with truncation and or corruption) or it is a summary
4301  * from a middle box that did the disectting for us.
4302  */
4303 static void
4304 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4305     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4306 {
4307         uint32_t bottle_bw, on_queue;
4308         uint16_t trunc_len;
4309         unsigned int chlen;
4310         unsigned int at;
4311         struct sctp_chunk_desc desc;
4312         struct sctp_chunkhdr *ch;
4313
4314         chlen = ntohs(cp->ch.chunk_length);
4315         chlen -= sizeof(struct sctp_pktdrop_chunk);
4316         /* XXX possible chlen underflow */
4317         if (chlen == 0) {
4318                 ch = NULL;
4319                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4320                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4321         } else {
4322                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4323                 chlen -= sizeof(struct sctphdr);
4324                 /* XXX possible chlen underflow */
4325                 memset(&desc, 0, sizeof(desc));
4326         }
4327         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4328         if (trunc_len > limit) {
4329                 trunc_len = limit;
4330         }
4331         /* now the chunks themselves */
4332         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4333                 desc.chunk_type = ch->chunk_type;
4334                 /* get amount we need to move */
4335                 at = ntohs(ch->chunk_length);
4336                 if (at < sizeof(struct sctp_chunkhdr)) {
4337                         /* corrupt chunk, maybe at the end? */
4338                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4339                         break;
4340                 }
4341                 if (trunc_len == 0) {
4342                         /* we are supposed to have all of it */
4343                         if (at > chlen) {
4344                                 /* corrupt skip it */
4345                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4346                                 break;
4347                         }
4348                 } else {
4349                         /* is there enough of it left ? */
4350                         if (desc.chunk_type == SCTP_DATA) {
4351                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4352                                     sizeof(desc.data_bytes))) {
4353                                         break;
4354                                 }
4355                         } else {
4356                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4357                                         break;
4358                                 }
4359                         }
4360                 }
4361                 if (desc.chunk_type == SCTP_DATA) {
4362                         /* can we get out the tsn? */
4363                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4364                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4365
4366                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4367                                 /* yep */
4368                                 struct sctp_data_chunk *dcp;
4369                                 uint8_t *ddp;
4370                                 unsigned int iii;
4371
4372                                 dcp = (struct sctp_data_chunk *)ch;
4373                                 ddp = (uint8_t *) (dcp + 1);
4374                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4375                                         desc.data_bytes[iii] = ddp[iii];
4376                                 }
4377                                 desc.tsn_ifany = dcp->dp.tsn;
4378                         } else {
4379                                 /* nope we are done. */
4380                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4381                                 break;
4382                         }
4383                 } else {
4384                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4385                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4386                 }
4387
4388                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4389                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4390                         break;
4391                 }
4392                 if (SCTP_SIZE32(at) > chlen) {
4393                         break;
4394                 }
4395                 chlen -= SCTP_SIZE32(at);
4396                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4397                         /* done, none left */
4398                         break;
4399                 }
4400                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4401         }
4402         /* Now update any rwnd --- possibly */
4403         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4404                 /* From a peer, we get a rwnd report */
4405                 uint32_t a_rwnd;
4406
4407                 SCTP_STAT_INCR(sctps_pdrpfehos);
4408
4409                 bottle_bw = ntohl(cp->bottle_bw);
4410                 on_queue = ntohl(cp->current_onq);
4411                 if (bottle_bw && on_queue) {
4412                         /* a rwnd report is in here */
4413                         if (bottle_bw > on_queue)
4414                                 a_rwnd = bottle_bw - on_queue;
4415                         else
4416                                 a_rwnd = 0;
4417
4418                         if (a_rwnd == 0)
4419                                 stcb->asoc.peers_rwnd = 0;
4420                         else {
4421                                 if (a_rwnd > stcb->asoc.total_flight) {
4422                                         stcb->asoc.peers_rwnd =
4423                                             a_rwnd - stcb->asoc.total_flight;
4424                                 } else {
4425                                         stcb->asoc.peers_rwnd = 0;
4426                                 }
4427                                 if (stcb->asoc.peers_rwnd <
4428                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4429                                         /* SWS sender side engages */
4430                                         stcb->asoc.peers_rwnd = 0;
4431                                 }
4432                         }
4433                 }
4434         } else {
4435                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4436         }
4437
4438         /* now middle boxes in sat networks get a cwnd bump */
4439         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4440             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4441             (stcb->asoc.sat_network)) {
4442                 /*
4443                  * This is debateable but for sat networks it makes sense
4444                  * Note if a T3 timer has went off, we will prohibit any
4445                  * changes to cwnd until we exit the t3 loss recovery.
4446                  */
4447                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4448                     net, cp, &bottle_bw, &on_queue);
4449         }
4450 }
4451
4452 /*
4453  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4454  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4455  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4456  * length of the complete packet outputs: - length: modified to remaining
4457  * length after control processing - netp: modified to new sctp_nets after
4458  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4459  * bad packet,...) otherwise return the tcb for this packet
4460  */
4461 #ifdef __GNUC__
4462 __attribute__((noinline))
4463 #endif
4464         static struct sctp_tcb *
4465                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4466              struct sockaddr *src, struct sockaddr *dst,
4467              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4468              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4469              uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4470              uint32_t vrf_id, uint16_t port)
4471 {
4472         struct sctp_association *asoc;
4473         struct mbuf *op_err;
4474         char msg[SCTP_DIAG_INFO_LEN];
4475         uint32_t vtag_in;
4476         int num_chunks = 0;     /* number of control chunks processed */
4477         uint32_t chk_length;
4478         int ret;
4479         int abort_no_unlock = 0;
4480         int ecne_seen = 0;
4481
4482         /*
4483          * How big should this be, and should it be alloc'd? Lets try the
4484          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4485          * until we get into jumbo grams and such..
4486          */
4487         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4488         struct sctp_tcb *locked_tcb = stcb;
4489         int got_auth = 0;
4490         uint32_t auth_offset = 0, auth_len = 0;
4491         int auth_skipped = 0;
4492         int asconf_cnt = 0;
4493
4494 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4495         struct socket *so;
4496
4497 #endif
4498
4499         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4500             iphlen, *offset, length, (void *)stcb);
4501
4502         /* validate chunk header length... */
4503         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4504                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4505                     ntohs(ch->chunk_length));
4506                 if (locked_tcb) {
4507                         SCTP_TCB_UNLOCK(locked_tcb);
4508                 }
4509                 return (NULL);
4510         }
4511         /*
4512          * validate the verification tag
4513          */
4514         vtag_in = ntohl(sh->v_tag);
4515
4516         if (locked_tcb) {
4517                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4518         }
4519         if (ch->chunk_type == SCTP_INITIATION) {
4520                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4521                     ntohs(ch->chunk_length), vtag_in);
4522                 if (vtag_in != 0) {
4523                         /* protocol error- silently discard... */
4524                         SCTP_STAT_INCR(sctps_badvtag);
4525                         if (locked_tcb) {
4526                                 SCTP_TCB_UNLOCK(locked_tcb);
4527                         }
4528                         return (NULL);
4529                 }
4530         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4531                 /*
4532                  * If there is no stcb, skip the AUTH chunk and process
4533                  * later after a stcb is found (to validate the lookup was
4534                  * valid.
4535                  */
4536                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4537                     (stcb == NULL) &&
4538                     (inp->auth_supported == 1)) {
4539                         /* save this chunk for later processing */
4540                         auth_skipped = 1;
4541                         auth_offset = *offset;
4542                         auth_len = ntohs(ch->chunk_length);
4543
4544                         /* (temporarily) move past this chunk */
4545                         *offset += SCTP_SIZE32(auth_len);
4546                         if (*offset >= length) {
4547                                 /* no more data left in the mbuf chain */
4548                                 *offset = length;
4549                                 if (locked_tcb) {
4550                                         SCTP_TCB_UNLOCK(locked_tcb);
4551                                 }
4552                                 return (NULL);
4553                         }
4554                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4555                             sizeof(struct sctp_chunkhdr), chunk_buf);
4556                 }
4557                 if (ch == NULL) {
4558                         /* Help */
4559                         *offset = length;
4560                         if (locked_tcb) {
4561                                 SCTP_TCB_UNLOCK(locked_tcb);
4562                         }
4563                         return (NULL);
4564                 }
4565                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4566                         goto process_control_chunks;
4567                 }
4568                 /*
4569                  * first check if it's an ASCONF with an unknown src addr we
4570                  * need to look inside to find the association
4571                  */
4572                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4573                         struct sctp_chunkhdr *asconf_ch = ch;
4574                         uint32_t asconf_offset = 0, asconf_len = 0;
4575
4576                         /* inp's refcount may be reduced */
4577                         SCTP_INP_INCR_REF(inp);
4578
4579                         asconf_offset = *offset;
4580                         do {
4581                                 asconf_len = ntohs(asconf_ch->chunk_length);
4582                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4583                                         break;
4584                                 stcb = sctp_findassociation_ep_asconf(m,
4585                                     *offset,
4586                                     dst,
4587                                     sh, &inp, netp, vrf_id);
4588                                 if (stcb != NULL)
4589                                         break;
4590                                 asconf_offset += SCTP_SIZE32(asconf_len);
4591                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4592                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4593                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4594                         if (stcb == NULL) {
4595                                 /*
4596                                  * reduce inp's refcount if not reduced in
4597                                  * sctp_findassociation_ep_asconf().
4598                                  */
4599                                 SCTP_INP_DECR_REF(inp);
4600                         } else {
4601                                 locked_tcb = stcb;
4602                         }
4603
4604                         /* now go back and verify any auth chunk to be sure */
4605                         if (auth_skipped && (stcb != NULL)) {
4606                                 struct sctp_auth_chunk *auth;
4607
4608                                 auth = (struct sctp_auth_chunk *)
4609                                     sctp_m_getptr(m, auth_offset,
4610                                     auth_len, chunk_buf);
4611                                 got_auth = 1;
4612                                 auth_skipped = 0;
4613                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4614                                     auth_offset)) {
4615                                         /* auth HMAC failed so dump it */
4616                                         *offset = length;
4617                                         if (locked_tcb) {
4618                                                 SCTP_TCB_UNLOCK(locked_tcb);
4619                                         }
4620                                         return (NULL);
4621                                 } else {
4622                                         /* remaining chunks are HMAC checked */
4623                                         stcb->asoc.authenticated = 1;
4624                                 }
4625                         }
4626                 }
4627                 if (stcb == NULL) {
4628                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4629                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4630                             msg);
4631                         /* no association, so it's out of the blue... */
4632                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4633                             mflowtype, mflowid, inp->fibnum,
4634                             vrf_id, port);
4635                         *offset = length;
4636                         if (locked_tcb) {
4637                                 SCTP_TCB_UNLOCK(locked_tcb);
4638                         }
4639                         return (NULL);
4640                 }
4641                 asoc = &stcb->asoc;
4642                 /* ABORT and SHUTDOWN can use either v_tag... */
4643                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4644                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4645                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4646                         /* Take the T-bit always into account. */
4647                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4648                             (vtag_in == asoc->my_vtag)) ||
4649                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4650                             (vtag_in == asoc->peer_vtag))) {
4651                                 /* this is valid */
4652                         } else {
4653                                 /* drop this packet... */
4654                                 SCTP_STAT_INCR(sctps_badvtag);
4655                                 if (locked_tcb) {
4656                                         SCTP_TCB_UNLOCK(locked_tcb);
4657                                 }
4658                                 return (NULL);
4659                         }
4660                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4661                         if (vtag_in != asoc->my_vtag) {
4662                                 /*
4663                                  * this could be a stale SHUTDOWN-ACK or the
4664                                  * peer never got the SHUTDOWN-COMPLETE and
4665                                  * is still hung; we have started a new asoc
4666                                  * but it won't complete until the shutdown
4667                                  * is completed
4668                                  */
4669                                 if (locked_tcb) {
4670                                         SCTP_TCB_UNLOCK(locked_tcb);
4671                                 }
4672                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4673                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4674                                     msg);
4675                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4676                                     sh, inp, op_err,
4677                                     mflowtype, mflowid, fibnum,
4678                                     vrf_id, port);
4679                                 return (NULL);
4680                         }
4681                 } else {
4682                         /* for all other chunks, vtag must match */
4683                         if (vtag_in != asoc->my_vtag) {
4684                                 /* invalid vtag... */
4685                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4686                                     "invalid vtag: %xh, expect %xh\n",
4687                                     vtag_in, asoc->my_vtag);
4688                                 SCTP_STAT_INCR(sctps_badvtag);
4689                                 if (locked_tcb) {
4690                                         SCTP_TCB_UNLOCK(locked_tcb);
4691                                 }
4692                                 *offset = length;
4693                                 return (NULL);
4694                         }
4695                 }
4696         }                       /* end if !SCTP_COOKIE_ECHO */
4697         /*
4698          * process all control chunks...
4699          */
4700         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4701             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4702             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4703             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4704                 /* implied cookie-ack.. we must have lost the ack */
4705                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4706                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4707                             stcb->asoc.overall_error_count,
4708                             0,
4709                             SCTP_FROM_SCTP_INPUT,
4710                             __LINE__);
4711                 }
4712                 stcb->asoc.overall_error_count = 0;
4713                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4714                     *netp);
4715         }
4716 process_control_chunks:
4717         while (IS_SCTP_CONTROL(ch)) {
4718                 /* validate chunk length */
4719                 chk_length = ntohs(ch->chunk_length);
4720                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4721                     ch->chunk_type, chk_length);
4722                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4723                 if (chk_length < sizeof(*ch) ||
4724                     (*offset + (int)chk_length) > length) {
4725                         *offset = length;
4726                         if (locked_tcb) {
4727                                 SCTP_TCB_UNLOCK(locked_tcb);
4728                         }
4729                         return (NULL);
4730                 }
4731                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4732                 /*
4733                  * INIT-ACK only gets the init ack "header" portion only
4734                  * because we don't have to process the peer's COOKIE. All
4735                  * others get a complete chunk.
4736                  */
4737                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4738                     (ch->chunk_type == SCTP_INITIATION)) {
4739                         /* get an init-ack chunk */
4740                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4741                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4742                         if (ch == NULL) {
4743                                 *offset = length;
4744                                 if (locked_tcb) {
4745                                         SCTP_TCB_UNLOCK(locked_tcb);
4746                                 }
4747                                 return (NULL);
4748                         }
4749                 } else {
4750                         /* For cookies and all other chunks. */
4751                         if (chk_length > sizeof(chunk_buf)) {
4752                                 /*
4753                                  * use just the size of the chunk buffer so
4754                                  * the front part of our chunks fit in
4755                                  * contiguous space up to the chunk buffer
4756                                  * size (508 bytes). For chunks that need to
4757                                  * get more than that they must use the
4758                                  * sctp_m_getptr() function or other means
4759                                  * (e.g. know how to parse mbuf chains).
4760                                  * Cookies do this already.
4761                                  */
4762                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4763                                     (sizeof(chunk_buf) - 4),
4764                                     chunk_buf);
4765                                 if (ch == NULL) {
4766                                         *offset = length;
4767                                         if (locked_tcb) {
4768                                                 SCTP_TCB_UNLOCK(locked_tcb);
4769                                         }
4770                                         return (NULL);
4771                                 }
4772                         } else {
4773                                 /* We can fit it all */
4774                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4775                                     chk_length, chunk_buf);
4776                                 if (ch == NULL) {
4777                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4778                                         *offset = length;
4779                                         if (locked_tcb) {
4780                                                 SCTP_TCB_UNLOCK(locked_tcb);
4781                                         }
4782                                         return (NULL);
4783                                 }
4784                         }
4785                 }
4786                 num_chunks++;
4787                 /* Save off the last place we got a control from */
4788                 if (stcb != NULL) {
4789                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4790                                 /*
4791                                  * allow last_control to be NULL if
4792                                  * ASCONF... ASCONF processing will find the
4793                                  * right net later
4794                                  */
4795                                 if ((netp != NULL) && (*netp != NULL))
4796                                         stcb->asoc.last_control_chunk_from = *netp;
4797                         }
4798                 }
4799 #ifdef SCTP_AUDITING_ENABLED
4800                 sctp_audit_log(0xB0, ch->chunk_type);
4801 #endif
4802
4803                 /* check to see if this chunk required auth, but isn't */
4804                 if ((stcb != NULL) &&
4805                     (stcb->asoc.auth_supported == 1) &&
4806                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4807                     !stcb->asoc.authenticated) {
4808                         /* "silently" ignore */
4809                         SCTP_STAT_INCR(sctps_recvauthmissing);
4810                         goto next_chunk;
4811                 }
4812                 switch (ch->chunk_type) {
4813                 case SCTP_INITIATION:
4814                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4815                         /* The INIT chunk must be the only chunk. */
4816                         if ((num_chunks > 1) ||
4817                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4818                                 /* RFC 4960 requires that no ABORT is sent */
4819                                 *offset = length;
4820                                 if (locked_tcb) {
4821                                         SCTP_TCB_UNLOCK(locked_tcb);
4822                                 }
4823                                 return (NULL);
4824                         }
4825                         /* Honor our resource limit. */
4826                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4827                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4828                                 sctp_abort_association(inp, stcb, m, iphlen,
4829                                     src, dst, sh, op_err,
4830                                     mflowtype, mflowid,
4831                                     vrf_id, port);
4832                                 *offset = length;
4833                                 return (NULL);
4834                         }
4835                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4836                             (struct sctp_init_chunk *)ch, inp,
4837                             stcb, &abort_no_unlock,
4838                             mflowtype, mflowid,
4839                             vrf_id, port);
4840                         *offset = length;
4841                         if ((!abort_no_unlock) && (locked_tcb)) {
4842                                 SCTP_TCB_UNLOCK(locked_tcb);
4843                         }
4844                         return (NULL);
4845                         break;
4846                 case SCTP_PAD_CHUNK:
4847                         break;
4848                 case SCTP_INITIATION_ACK:
4849                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4850                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4851                                 /* We are not interested anymore */
4852                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4853                                         ;
4854                                 } else {
4855                                         if (locked_tcb != stcb) {
4856                                                 /* Very unlikely */
4857                                                 SCTP_TCB_UNLOCK(locked_tcb);
4858                                         }
4859                                         *offset = length;
4860                                         if (stcb) {
4861 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4862                                                 so = SCTP_INP_SO(inp);
4863                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4864                                                 SCTP_TCB_UNLOCK(stcb);
4865                                                 SCTP_SOCKET_LOCK(so, 1);
4866                                                 SCTP_TCB_LOCK(stcb);
4867                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4868 #endif
4869                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4870                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4872                                                 SCTP_SOCKET_UNLOCK(so, 1);
4873 #endif
4874                                         }
4875                                         return (NULL);
4876                                 }
4877                         }
4878                         /* The INIT-ACK chunk must be the only chunk. */
4879                         if ((num_chunks > 1) ||
4880                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4881                                 *offset = length;
4882                                 if (locked_tcb) {
4883                                         SCTP_TCB_UNLOCK(locked_tcb);
4884                                 }
4885                                 return (NULL);
4886                         }
4887                         if ((netp) && (*netp)) {
4888                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4889                                     src, dst, sh,
4890                                     (struct sctp_init_ack_chunk *)ch,
4891                                     stcb, *netp,
4892                                     &abort_no_unlock,
4893                                     mflowtype, mflowid,
4894                                     vrf_id);
4895                         } else {
4896                                 ret = -1;
4897                         }
4898                         *offset = length;
4899                         if (abort_no_unlock) {
4900                                 return (NULL);
4901                         }
4902                         /*
4903                          * Special case, I must call the output routine to
4904                          * get the cookie echoed
4905                          */
4906                         if ((stcb != NULL) && (ret == 0)) {
4907                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4908                         }
4909                         if (locked_tcb) {
4910                                 SCTP_TCB_UNLOCK(locked_tcb);
4911                         }
4912                         return (NULL);
4913                         break;
4914                 case SCTP_SELECTIVE_ACK:
4915                         {
4916                                 struct sctp_sack_chunk *sack;
4917                                 int abort_now = 0;
4918                                 uint32_t a_rwnd, cum_ack;
4919                                 uint16_t num_seg, num_dup;
4920                                 uint8_t flags;
4921                                 int offset_seg, offset_dup;
4922
4923                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4924                                 SCTP_STAT_INCR(sctps_recvsacks);
4925                                 if (stcb == NULL) {
4926                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4927                                         break;
4928                                 }
4929                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4930                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4931                                         break;
4932                                 }
4933                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4934                                         /*-
4935                                          * If we have sent a shutdown-ack, we will pay no
4936                                          * attention to a sack sent in to us since
4937                                          * we don't care anymore.
4938                                          */
4939                                         break;
4940                                 }
4941                                 sack = (struct sctp_sack_chunk *)ch;
4942                                 flags = ch->chunk_flags;
4943                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4944                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4945                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4946                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4947                                 if (sizeof(struct sctp_sack_chunk) +
4948                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4949                                     num_dup * sizeof(uint32_t) != chk_length) {
4950                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4951                                         break;
4952                                 }
4953                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4954                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4955                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4956                                     cum_ack, num_seg, a_rwnd);
4957                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4958                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4959                                     (num_seg == 0) &&
4960                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4961                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4962                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4963                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4964                                     ) {
4965                                         /*
4966                                          * We have a SIMPLE sack having no
4967                                          * prior segments and data on sent
4968                                          * queue to be acked.. Use the
4969                                          * faster path sack processing. We
4970                                          * also allow window update sacks
4971                                          * with no missing segments to go
4972                                          * this way too.
4973                                          */
4974                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4975                                 } else {
4976                                         if (netp && *netp)
4977                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4978                                                     num_seg, 0, num_dup, &abort_now, flags,
4979                                                     cum_ack, a_rwnd, ecne_seen);
4980                                 }
4981                                 if (abort_now) {
4982                                         /* ABORT signal from sack processing */
4983                                         *offset = length;
4984                                         return (NULL);
4985                                 }
4986                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4987                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4988                                     (stcb->asoc.stream_queue_cnt == 0)) {
4989                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4990                                 }
4991                         }
4992                         break;
4993                         /*
4994                          * EY - nr_sack:  If the received chunk is an
4995                          * nr_sack chunk
4996                          */
4997                 case SCTP_NR_SELECTIVE_ACK:
4998                         {
4999                                 struct sctp_nr_sack_chunk *nr_sack;
5000                                 int abort_now = 0;
5001                                 uint32_t a_rwnd, cum_ack;
5002                                 uint16_t num_seg, num_nr_seg, num_dup;
5003                                 uint8_t flags;
5004                                 int offset_seg, offset_dup;
5005
5006                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
5007                                 SCTP_STAT_INCR(sctps_recvsacks);
5008                                 if (stcb == NULL) {
5009                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
5010                                         break;
5011                                 }
5012                                 if (stcb->asoc.nrsack_supported == 0) {
5013                                         goto unknown_chunk;
5014                                 }
5015                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5016                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
5017                                         break;
5018                                 }
5019                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5020                                         /*-
5021                                          * If we have sent a shutdown-ack, we will pay no
5022                                          * attention to a sack sent in to us since
5023                                          * we don't care anymore.
5024                                          */
5025                                         break;
5026                                 }
5027                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5028                                 flags = ch->chunk_flags;
5029                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5030                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5031                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5032                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5033                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
5034                                 if (sizeof(struct sctp_nr_sack_chunk) +
5035                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5036                                     num_dup * sizeof(uint32_t) != chk_length) {
5037                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5038                                         break;
5039                                 }
5040                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5041                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5042                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5043                                     cum_ack, num_seg, a_rwnd);
5044                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5045                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5046                                     (num_seg == 0) && (num_nr_seg == 0) &&
5047                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5048                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5049                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5050                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5051                                         /*
5052                                          * We have a SIMPLE sack having no
5053                                          * prior segments and data on sent
5054                                          * queue to be acked. Use the faster
5055                                          * path sack processing. We also
5056                                          * allow window update sacks with no
5057                                          * missing segments to go this way
5058                                          * too.
5059                                          */
5060                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5061                                             &abort_now, ecne_seen);
5062                                 } else {
5063                                         if (netp && *netp)
5064                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5065                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5066                                                     cum_ack, a_rwnd, ecne_seen);
5067                                 }
5068                                 if (abort_now) {
5069                                         /* ABORT signal from sack processing */
5070                                         *offset = length;
5071                                         return (NULL);
5072                                 }
5073                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5074                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5075                                     (stcb->asoc.stream_queue_cnt == 0)) {
5076                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5077                                 }
5078                         }
5079                         break;
5080
5081                 case SCTP_HEARTBEAT_REQUEST:
5082                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5083                         if ((stcb) && netp && *netp) {
5084                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5085                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5086                                     chk_length, *netp);
5087
5088                                 /* He's alive so give him credit */
5089                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5090                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5091                                             stcb->asoc.overall_error_count,
5092                                             0,
5093                                             SCTP_FROM_SCTP_INPUT,
5094                                             __LINE__);
5095                                 }
5096                                 stcb->asoc.overall_error_count = 0;
5097                         }
5098                         break;
5099                 case SCTP_HEARTBEAT_ACK:
5100                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5101                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5102                                 /* Its not ours */
5103                                 *offset = length;
5104                                 if (locked_tcb) {
5105                                         SCTP_TCB_UNLOCK(locked_tcb);
5106                                 }
5107                                 return (NULL);
5108                         }
5109                         /* He's alive so give him credit */
5110                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5111                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5112                                     stcb->asoc.overall_error_count,
5113                                     0,
5114                                     SCTP_FROM_SCTP_INPUT,
5115                                     __LINE__);
5116                         }
5117                         stcb->asoc.overall_error_count = 0;
5118                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5119                         if (netp && *netp)
5120                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5121                                     stcb, *netp);
5122                         break;
5123                 case SCTP_ABORT_ASSOCIATION:
5124                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5125                             (void *)stcb);
5126                         if ((stcb) && netp && *netp)
5127                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5128                                     stcb, *netp);
5129                         *offset = length;
5130                         return (NULL);
5131                         break;
5132                 case SCTP_SHUTDOWN:
5133                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5134                             (void *)stcb);
5135                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5136                                 *offset = length;
5137                                 if (locked_tcb) {
5138                                         SCTP_TCB_UNLOCK(locked_tcb);
5139                                 }
5140                                 return (NULL);
5141                         }
5142                         if (netp && *netp) {
5143                                 int abort_flag = 0;
5144
5145                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5146                                     stcb, *netp, &abort_flag);
5147                                 if (abort_flag) {
5148                                         *offset = length;
5149                                         return (NULL);
5150                                 }
5151                         }
5152                         break;
5153                 case SCTP_SHUTDOWN_ACK:
5154                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5155                         if ((stcb) && (netp) && (*netp))
5156                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5157                         *offset = length;
5158                         return (NULL);
5159                         break;
5160
5161                 case SCTP_OPERATION_ERROR:
5162                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5163                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5164                                 *offset = length;
5165                                 return (NULL);
5166                         }
5167                         break;
5168                 case SCTP_COOKIE_ECHO:
5169                         SCTPDBG(SCTP_DEBUG_INPUT3,
5170                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5171                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5172                                 ;
5173                         } else {
5174                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5175                                         /* We are not interested anymore */
5176                         abend:
5177                                         if (stcb) {
5178                                                 SCTP_TCB_UNLOCK(stcb);
5179                                         }
5180                                         *offset = length;
5181                                         return (NULL);
5182                                 }
5183                         }
5184                         /*
5185                          * First are we accepting? We do this again here
5186                          * since it is possible that a previous endpoint WAS
5187                          * listening responded to a INIT-ACK and then
5188                          * closed. We opened and bound.. and are now no
5189                          * longer listening.
5190                          */
5191
5192                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5193                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5194                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5195                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5196                                         sctp_abort_association(inp, stcb, m, iphlen,
5197                                             src, dst, sh, op_err,
5198                                             mflowtype, mflowid,
5199                                             vrf_id, port);
5200                                 }
5201                                 *offset = length;
5202                                 return (NULL);
5203                         } else {
5204                                 struct mbuf *ret_buf;
5205                                 struct sctp_inpcb *linp;
5206
5207                                 if (stcb) {
5208                                         linp = NULL;
5209                                 } else {
5210                                         linp = inp;
5211                                 }
5212
5213                                 if (linp) {
5214                                         SCTP_ASOC_CREATE_LOCK(linp);
5215                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5216                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5217                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5218                                                 goto abend;
5219                                         }
5220                                 }
5221                                 if (netp) {
5222                                         ret_buf =
5223                                             sctp_handle_cookie_echo(m, iphlen,
5224                                             *offset,
5225                                             src, dst,
5226                                             sh,
5227                                             (struct sctp_cookie_echo_chunk *)ch,
5228                                             &inp, &stcb, netp,
5229                                             auth_skipped,
5230                                             auth_offset,
5231                                             auth_len,
5232                                             &locked_tcb,
5233                                             mflowtype,
5234                                             mflowid,
5235                                             vrf_id,
5236                                             port);
5237                                 } else {
5238                                         ret_buf = NULL;
5239                                 }
5240                                 if (linp) {
5241                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5242                                 }
5243                                 if (ret_buf == NULL) {
5244                                         if (locked_tcb) {
5245                                                 SCTP_TCB_UNLOCK(locked_tcb);
5246                                         }
5247                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5248                                             "GAK, null buffer\n");
5249                                         *offset = length;
5250                                         return (NULL);
5251                                 }
5252                                 /* if AUTH skipped, see if it verified... */
5253                                 if (auth_skipped) {
5254                                         got_auth = 1;
5255                                         auth_skipped = 0;
5256                                 }
5257                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5258                                         /*
5259                                          * Restart the timer if we have
5260                                          * pending data
5261                                          */
5262                                         struct sctp_tmit_chunk *chk;
5263
5264                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5265                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5266                                 }
5267                         }
5268                         break;
5269                 case SCTP_COOKIE_ACK:
5270                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5271                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5272                                 if (locked_tcb) {
5273                                         SCTP_TCB_UNLOCK(locked_tcb);
5274                                 }
5275                                 return (NULL);
5276                         }
5277                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5278                                 /* We are not interested anymore */
5279                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5280                                         ;
5281                                 } else if (stcb) {
5282 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5283                                         so = SCTP_INP_SO(inp);
5284                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5285                                         SCTP_TCB_UNLOCK(stcb);
5286                                         SCTP_SOCKET_LOCK(so, 1);
5287                                         SCTP_TCB_LOCK(stcb);
5288                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5289 #endif
5290                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5291                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5292 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5293                                         SCTP_SOCKET_UNLOCK(so, 1);
5294 #endif
5295                                         *offset = length;
5296                                         return (NULL);
5297                                 }
5298                         }
5299                         /* He's alive so give him credit */
5300                         if ((stcb) && netp && *netp) {
5301                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5302                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5303                                             stcb->asoc.overall_error_count,
5304                                             0,
5305                                             SCTP_FROM_SCTP_INPUT,
5306                                             __LINE__);
5307                                 }
5308                                 stcb->asoc.overall_error_count = 0;
5309                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5310                         }
5311                         break;
5312                 case SCTP_ECN_ECHO:
5313                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5314                         /* He's alive so give him credit */
5315                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5316                                 /* Its not ours */
5317                                 if (locked_tcb) {
5318                                         SCTP_TCB_UNLOCK(locked_tcb);
5319                                 }
5320                                 *offset = length;
5321                                 return (NULL);
5322                         }
5323                         if (stcb) {
5324                                 if (stcb->asoc.ecn_supported == 0) {
5325                                         goto unknown_chunk;
5326                                 }
5327                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5328                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5329                                             stcb->asoc.overall_error_count,
5330                                             0,
5331                                             SCTP_FROM_SCTP_INPUT,
5332                                             __LINE__);
5333                                 }
5334                                 stcb->asoc.overall_error_count = 0;
5335                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5336                                     stcb);
5337                                 ecne_seen = 1;
5338                         }
5339                         break;
5340                 case SCTP_ECN_CWR:
5341                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5342                         /* He's alive so give him credit */
5343                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5344                                 /* Its not ours */
5345                                 if (locked_tcb) {
5346                                         SCTP_TCB_UNLOCK(locked_tcb);
5347                                 }
5348                                 *offset = length;
5349                                 return (NULL);
5350                         }
5351                         if (stcb) {
5352                                 if (stcb->asoc.ecn_supported == 0) {
5353                                         goto unknown_chunk;
5354                                 }
5355                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5356                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5357                                             stcb->asoc.overall_error_count,
5358                                             0,
5359                                             SCTP_FROM_SCTP_INPUT,
5360                                             __LINE__);
5361                                 }
5362                                 stcb->asoc.overall_error_count = 0;
5363                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5364                         }
5365                         break;
5366                 case SCTP_SHUTDOWN_COMPLETE:
5367                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5368                         /* must be first and only chunk */
5369                         if ((num_chunks > 1) ||
5370                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5371                                 *offset = length;
5372                                 if (locked_tcb) {
5373                                         SCTP_TCB_UNLOCK(locked_tcb);
5374                                 }
5375                                 return (NULL);
5376                         }
5377                         if ((stcb) && netp && *netp) {
5378                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5379                                     stcb, *netp);
5380                         }
5381                         *offset = length;
5382                         return (NULL);
5383                         break;
5384                 case SCTP_ASCONF:
5385                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5386                         /* He's alive so give him credit */
5387                         if (stcb) {
5388                                 if (stcb->asoc.asconf_supported == 0) {
5389                                         goto unknown_chunk;
5390                                 }
5391                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5392                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5393                                             stcb->asoc.overall_error_count,
5394                                             0,
5395                                             SCTP_FROM_SCTP_INPUT,
5396                                             __LINE__);
5397                                 }
5398                                 stcb->asoc.overall_error_count = 0;
5399                                 sctp_handle_asconf(m, *offset, src,
5400                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5401                                 asconf_cnt++;
5402                         }
5403                         break;
5404                 case SCTP_ASCONF_ACK:
5405                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5406                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5407                                 /* Its not ours */
5408                                 if (locked_tcb) {
5409                                         SCTP_TCB_UNLOCK(locked_tcb);
5410                                 }
5411                                 *offset = length;
5412                                 return (NULL);
5413                         }
5414                         if ((stcb) && netp && *netp) {
5415                                 if (stcb->asoc.asconf_supported == 0) {
5416                                         goto unknown_chunk;
5417                                 }
5418                                 /* He's alive so give him credit */
5419                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5420                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5421                                             stcb->asoc.overall_error_count,
5422                                             0,
5423                                             SCTP_FROM_SCTP_INPUT,
5424                                             __LINE__);
5425                                 }
5426                                 stcb->asoc.overall_error_count = 0;
5427                                 sctp_handle_asconf_ack(m, *offset,
5428                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5429                                 if (abort_no_unlock)
5430                                         return (NULL);
5431                         }
5432                         break;
5433                 case SCTP_FORWARD_CUM_TSN:
5434                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5435                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5436                                 /* Its not ours */
5437                                 if (locked_tcb) {
5438                                         SCTP_TCB_UNLOCK(locked_tcb);
5439                                 }
5440                                 *offset = length;
5441                                 return (NULL);
5442                         }
5443                         /* He's alive so give him credit */
5444                         if (stcb) {
5445                                 int abort_flag = 0;
5446
5447                                 if (stcb->asoc.prsctp_supported == 0) {
5448                                         goto unknown_chunk;
5449                                 }
5450                                 stcb->asoc.overall_error_count = 0;
5451                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5452                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5453                                             stcb->asoc.overall_error_count,
5454                                             0,
5455                                             SCTP_FROM_SCTP_INPUT,
5456                                             __LINE__);
5457                                 }
5458                                 *fwd_tsn_seen = 1;
5459                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5460                                         /* We are not interested anymore */
5461 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5462                                         so = SCTP_INP_SO(inp);
5463                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5464                                         SCTP_TCB_UNLOCK(stcb);
5465                                         SCTP_SOCKET_LOCK(so, 1);
5466                                         SCTP_TCB_LOCK(stcb);
5467                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5468 #endif
5469                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5470                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5471 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5472                                         SCTP_SOCKET_UNLOCK(so, 1);
5473 #endif
5474                                         *offset = length;
5475                                         return (NULL);
5476                                 }
5477                                 sctp_handle_forward_tsn(stcb,
5478                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5479                                 if (abort_flag) {
5480                                         *offset = length;
5481                                         return (NULL);
5482                                 } else {
5483                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5484                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5485                                                     stcb->asoc.overall_error_count,
5486                                                     0,
5487                                                     SCTP_FROM_SCTP_INPUT,
5488                                                     __LINE__);
5489                                         }
5490                                         stcb->asoc.overall_error_count = 0;
5491                                 }
5492
5493                         }
5494                         break;
5495                 case SCTP_STREAM_RESET:
5496                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5497                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5498                                 /* Its not ours */
5499                                 if (locked_tcb) {
5500                                         SCTP_TCB_UNLOCK(locked_tcb);
5501                                 }
5502                                 *offset = length;
5503                                 return (NULL);
5504                         }
5505                         if (stcb->asoc.reconfig_supported == 0) {
5506                                 goto unknown_chunk;
5507                         }
5508                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5509                                 /* stop processing */
5510                                 *offset = length;
5511                                 return (NULL);
5512                         }
5513                         break;
5514                 case SCTP_PACKET_DROPPED:
5515                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5516                         /* re-get it all please */
5517                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5518                                 /* Its not ours */
5519                                 if (locked_tcb) {
5520                                         SCTP_TCB_UNLOCK(locked_tcb);
5521                                 }
5522                                 *offset = length;
5523                                 return (NULL);
5524                         }
5525                         if (ch && (stcb) && netp && (*netp)) {
5526                                 if (stcb->asoc.pktdrop_supported == 0) {
5527                                         goto unknown_chunk;
5528                                 }
5529                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5530                                     stcb, *netp,
5531                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5532
5533                         }
5534                         break;
5535                 case SCTP_AUTHENTICATION:
5536                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5537                         if (stcb == NULL) {
5538                                 /* save the first AUTH for later processing */
5539                                 if (auth_skipped == 0) {
5540                                         auth_offset = *offset;
5541                                         auth_len = chk_length;
5542                                         auth_skipped = 1;
5543                                 }
5544                                 /* skip this chunk (temporarily) */
5545                                 goto next_chunk;
5546                         }
5547                         if (stcb->asoc.auth_supported == 0) {
5548                                 goto unknown_chunk;
5549                         }
5550                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5551                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5552                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5553                                 /* Its not ours */
5554                                 if (locked_tcb) {
5555                                         SCTP_TCB_UNLOCK(locked_tcb);
5556                                 }
5557                                 *offset = length;
5558                                 return (NULL);
5559                         }
5560                         if (got_auth == 1) {
5561                                 /* skip this chunk... it's already auth'd */
5562                                 goto next_chunk;
5563                         }
5564                         got_auth = 1;
5565                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5566                             m, *offset)) {
5567                                 /* auth HMAC failed so dump the packet */
5568                                 *offset = length;
5569                                 return (stcb);
5570                         } else {
5571                                 /* remaining chunks are HMAC checked */
5572                                 stcb->asoc.authenticated = 1;
5573                         }
5574                         break;
5575
5576                 default:
5577         unknown_chunk:
5578                         /* it's an unknown chunk! */
5579                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5580                                 struct sctp_gen_error_cause *cause;
5581                                 int len;
5582
5583                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5584                                     0, M_NOWAIT, 1, MT_DATA);
5585                                 if (op_err != NULL) {
5586                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5587                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5588                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5589                                         cause->length = htons(len + sizeof(struct sctp_gen_error_cause));
5590                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5591                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5592                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5593 #ifdef SCTP_MBUF_LOGGING
5594                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5595                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5596                                                 }
5597 #endif
5598                                                 sctp_queue_op_err(stcb, op_err);
5599                                         } else {
5600                                                 sctp_m_freem(op_err);
5601                                         }
5602                                 }
5603                         }
5604                         if ((ch->chunk_type & 0x80) == 0) {
5605                                 /* discard this packet */
5606                                 *offset = length;
5607                                 return (stcb);
5608                         }       /* else skip this bad chunk and continue... */
5609                         break;
5610                 }               /* switch (ch->chunk_type) */
5611
5612
5613 next_chunk:
5614                 /* get the next chunk */
5615                 *offset += SCTP_SIZE32(chk_length);
5616                 if (*offset >= length) {
5617                         /* no more data left in the mbuf chain */
5618                         break;
5619                 }
5620                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5621                     sizeof(struct sctp_chunkhdr), chunk_buf);
5622                 if (ch == NULL) {
5623                         if (locked_tcb) {
5624                                 SCTP_TCB_UNLOCK(locked_tcb);
5625                         }
5626                         *offset = length;
5627                         return (NULL);
5628                 }
5629         }                       /* while */
5630
5631         if (asconf_cnt > 0 && stcb != NULL) {
5632                 sctp_send_asconf_ack(stcb);
5633         }
5634         return (stcb);
5635 }
5636
5637
5638 #ifdef INVARIANTS
5639 #ifdef __GNUC__
5640 __attribute__((noinline))
5641 #endif
5642         void
5643              sctp_validate_no_locks(struct sctp_inpcb *inp)
5644 {
5645         struct sctp_tcb *lstcb;
5646
5647         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5648                 if (mtx_owned(&lstcb->tcb_mtx)) {
5649                         panic("Own lock on stcb at return from input");
5650                 }
5651         }
5652         if (mtx_owned(&inp->inp_create_mtx)) {
5653                 panic("Own create lock on inp");
5654         }
5655         if (mtx_owned(&inp->inp_mtx)) {
5656                 panic("Own inp lock on inp");
5657         }
5658 }
5659
5660 #endif
5661
5662 /*
5663  * common input chunk processing (v4 and v6)
5664  */
5665 void
5666 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5667     struct sockaddr *src, struct sockaddr *dst,
5668     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5669 #if !defined(SCTP_WITH_NO_CSUM)
5670     uint8_t compute_crc,
5671 #endif
5672     uint8_t ecn_bits,
5673     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5674     uint32_t vrf_id, uint16_t port)
5675 {
5676         uint32_t high_tsn;
5677         int fwd_tsn_seen = 0, data_processed = 0;
5678         struct mbuf *m = *mm, *op_err;
5679         char msg[SCTP_DIAG_INFO_LEN];
5680         int un_sent;
5681         int cnt_ctrl_ready = 0;
5682         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5683         struct sctp_tcb *stcb = NULL;
5684         struct sctp_nets *net = NULL;
5685
5686         SCTP_STAT_INCR(sctps_recvdatagrams);
5687 #ifdef SCTP_AUDITING_ENABLED
5688         sctp_audit_log(0xE0, 1);
5689         sctp_auditing(0, inp, stcb, net);
5690 #endif
5691 #if !defined(SCTP_WITH_NO_CSUM)
5692         if (compute_crc != 0) {
5693                 uint32_t check, calc_check;
5694
5695                 check = sh->checksum;
5696                 sh->checksum = 0;
5697                 calc_check = sctp_calculate_cksum(m, iphlen);
5698                 sh->checksum = check;
5699                 if (calc_check != check) {
5700                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5701                             calc_check, check, (void *)m, length, iphlen);
5702                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5703                             sh, ch, &inp, &net, vrf_id);
5704 #if defined(INET) || defined(INET6)
5705                         if ((net != NULL) && (port != 0)) {
5706                                 if (net->port == 0) {
5707                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5708                                 }
5709                                 net->port = port;
5710                         }
5711 #endif
5712                         if (net != NULL) {
5713                                 net->flowtype = mflowtype;
5714                                 net->flowid = mflowid;
5715                         }
5716                         if ((inp != NULL) && (stcb != NULL)) {
5717                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5718                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5719                         } else if ((inp != NULL) && (stcb == NULL)) {
5720                                 inp_decr = inp;
5721                         }
5722                         SCTP_STAT_INCR(sctps_badsum);
5723                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5724                         goto out;
5725                 }
5726         }
5727 #endif
5728         /* Destination port of 0 is illegal, based on RFC4960. */
5729         if (sh->dest_port == 0) {
5730                 SCTP_STAT_INCR(sctps_hdrops);
5731                 goto out;
5732         }
5733         stcb = sctp_findassociation_addr(m, offset, src, dst,
5734             sh, ch, &inp, &net, vrf_id);
5735 #if defined(INET) || defined(INET6)
5736         if ((net != NULL) && (port != 0)) {
5737                 if (net->port == 0) {
5738                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5739                 }
5740                 net->port = port;
5741         }
5742 #endif
5743         if (net != NULL) {
5744                 net->flowtype = mflowtype;
5745                 net->flowid = mflowid;
5746         }
5747         if (inp == NULL) {
5748                 SCTP_STAT_INCR(sctps_noport);
5749                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5750                         goto out;
5751                 }
5752                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5753                         sctp_send_shutdown_complete2(src, dst, sh,
5754                             mflowtype, mflowid, fibnum,
5755                             vrf_id, port);
5756                         goto out;
5757                 }
5758                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5759                         goto out;
5760                 }
5761                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5762                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5763                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5764                             (ch->chunk_type != SCTP_INIT))) {
5765                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5766                                     "Out of the blue");
5767                                 sctp_send_abort(m, iphlen, src, dst,
5768                                     sh, 0, op_err,
5769                                     mflowtype, mflowid, fibnum,
5770                                     vrf_id, port);
5771                         }
5772                 }
5773                 goto out;
5774         } else if (stcb == NULL) {
5775                 inp_decr = inp;
5776         }
5777 #ifdef IPSEC
5778         /*-
5779          * I very much doubt any of the IPSEC stuff will work but I have no
5780          * idea, so I will leave it in place.
5781          */
5782         if (inp != NULL) {
5783                 switch (dst->sa_family) {
5784 #ifdef INET
5785                 case AF_INET:
5786                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5787                                 IPSECSTAT_INC(ips_in_polvio);
5788                                 SCTP_STAT_INCR(sctps_hdrops);
5789                                 goto out;
5790                         }
5791                         break;
5792 #endif
5793 #ifdef INET6
5794                 case AF_INET6:
5795                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5796                                 IPSEC6STAT_INC(ips_in_polvio);
5797                                 SCTP_STAT_INCR(sctps_hdrops);
5798                                 goto out;
5799                         }
5800                         break;
5801 #endif
5802                 default:
5803                         break;
5804                 }
5805         }
5806 #endif
5807         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5808             (void *)m, iphlen, offset, length, (void *)stcb);
5809         if (stcb) {
5810                 /* always clear this before beginning a packet */
5811                 stcb->asoc.authenticated = 0;
5812                 stcb->asoc.seen_a_sack_this_pkt = 0;
5813                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5814                     (void *)stcb, stcb->asoc.state);
5815
5816                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5817                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5818                         /*-
5819                          * If we hit here, we had a ref count
5820                          * up when the assoc was aborted and the
5821                          * timer is clearing out the assoc, we should
5822                          * NOT respond to any packet.. its OOTB.
5823                          */
5824                         SCTP_TCB_UNLOCK(stcb);
5825                         stcb = NULL;
5826                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5827                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5828                             msg);
5829                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5830                             mflowtype, mflowid, inp->fibnum,
5831                             vrf_id, port);
5832                         goto out;
5833                 }
5834         }
5835         if (IS_SCTP_CONTROL(ch)) {
5836                 /* process the control portion of the SCTP packet */
5837                 /* sa_ignore NO_NULL_CHK */
5838                 stcb = sctp_process_control(m, iphlen, &offset, length,
5839                     src, dst, sh, ch,
5840                     inp, stcb, &net, &fwd_tsn_seen,
5841                     mflowtype, mflowid, fibnum,
5842                     vrf_id, port);
5843                 if (stcb) {
5844                         /*
5845                          * This covers us if the cookie-echo was there and
5846                          * it changes our INP.
5847                          */
5848                         inp = stcb->sctp_ep;
5849 #if defined(INET) || defined(INET6)
5850                         if ((net) && (port)) {
5851                                 if (net->port == 0) {
5852                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5853                                 }
5854                                 net->port = port;
5855                         }
5856 #endif
5857                 }
5858         } else {
5859                 /*
5860                  * no control chunks, so pre-process DATA chunks (these
5861                  * checks are taken care of by control processing)
5862                  */
5863
5864                 /*
5865                  * if DATA only packet, and auth is required, then punt...
5866                  * can't have authenticated without any AUTH (control)
5867                  * chunks
5868                  */
5869                 if ((stcb != NULL) &&
5870                     (stcb->asoc.auth_supported == 1) &&
5871                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5872                         /* "silently" ignore */
5873                         SCTP_STAT_INCR(sctps_recvauthmissing);
5874                         goto out;
5875                 }
5876                 if (stcb == NULL) {
5877                         /* out of the blue DATA chunk */
5878                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5879                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5880                             msg);
5881                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5882                             mflowtype, mflowid, fibnum,
5883                             vrf_id, port);
5884                         goto out;
5885                 }
5886                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5887                         /* v_tag mismatch! */
5888                         SCTP_STAT_INCR(sctps_badvtag);
5889                         goto out;
5890                 }
5891         }
5892
5893         if (stcb == NULL) {
5894                 /*
5895                  * no valid TCB for this packet, or we found it's a bad
5896                  * packet while processing control, or we're done with this
5897                  * packet (done or skip rest of data), so we drop it...
5898                  */
5899                 goto out;
5900         }
5901         /*
5902          * DATA chunk processing
5903          */
5904         /* plow through the data chunks while length > offset */
5905
5906         /*
5907          * Rest should be DATA only.  Check authentication state if AUTH for
5908          * DATA is required.
5909          */
5910         if ((length > offset) &&
5911             (stcb != NULL) &&
5912             (stcb->asoc.auth_supported == 1) &&
5913             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5914             !stcb->asoc.authenticated) {
5915                 /* "silently" ignore */
5916                 SCTP_STAT_INCR(sctps_recvauthmissing);
5917                 SCTPDBG(SCTP_DEBUG_AUTH1,
5918                     "Data chunk requires AUTH, skipped\n");
5919                 goto trigger_send;
5920         }
5921         if (length > offset) {
5922                 int retval;
5923
5924                 /*
5925                  * First check to make sure our state is correct. We would
5926                  * not get here unless we really did have a tag, so we don't
5927                  * abort if this happens, just dump the chunk silently.
5928                  */
5929                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5930                 case SCTP_STATE_COOKIE_ECHOED:
5931                         /*
5932                          * we consider data with valid tags in this state
5933                          * shows us the cookie-ack was lost. Imply it was
5934                          * there.
5935                          */
5936                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5937                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5938                                     stcb->asoc.overall_error_count,
5939                                     0,
5940                                     SCTP_FROM_SCTP_INPUT,
5941                                     __LINE__);
5942                         }
5943                         stcb->asoc.overall_error_count = 0;
5944                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5945                         break;
5946                 case SCTP_STATE_COOKIE_WAIT:
5947                         /*
5948                          * We consider OOTB any data sent during asoc setup.
5949                          */
5950                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5951                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5952                             msg);
5953                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5954                             mflowtype, mflowid, inp->fibnum,
5955                             vrf_id, port);
5956                         goto out;
5957                         /* sa_ignore NOTREACHED */
5958                         break;
5959                 case SCTP_STATE_EMPTY:  /* should not happen */
5960                 case SCTP_STATE_INUSE:  /* should not happen */
5961                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5962                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5963                 default:
5964                         goto out;
5965                         /* sa_ignore NOTREACHED */
5966                         break;
5967                 case SCTP_STATE_OPEN:
5968                 case SCTP_STATE_SHUTDOWN_SENT:
5969                         break;
5970                 }
5971                 /* plow through the data chunks while length > offset */
5972                 retval = sctp_process_data(mm, iphlen, &offset, length,
5973                     inp, stcb, net, &high_tsn);
5974                 if (retval == 2) {
5975                         /*
5976                          * The association aborted, NO UNLOCK needed since
5977                          * the association is destroyed.
5978                          */
5979                         stcb = NULL;
5980                         goto out;
5981                 }
5982                 data_processed = 1;
5983                 /*
5984                  * Anything important needs to have been m_copy'ed in
5985                  * process_data
5986                  */
5987         }
5988         /* take care of ecn */
5989         if ((data_processed == 1) &&
5990             (stcb->asoc.ecn_supported == 1) &&
5991             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5992                 /* Yep, we need to add a ECNE */
5993                 sctp_send_ecn_echo(stcb, net, high_tsn);
5994         }
5995         if ((data_processed == 0) && (fwd_tsn_seen)) {
5996                 int was_a_gap;
5997                 uint32_t highest_tsn;
5998
5999                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
6000                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
6001                 } else {
6002                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
6003                 }
6004                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
6005                 stcb->asoc.send_sack = 1;
6006                 sctp_sack_check(stcb, was_a_gap);
6007         } else if (fwd_tsn_seen) {
6008                 stcb->asoc.send_sack = 1;
6009         }
6010         /* trigger send of any chunks in queue... */
6011 trigger_send:
6012 #ifdef SCTP_AUDITING_ENABLED
6013         sctp_audit_log(0xE0, 2);
6014         sctp_auditing(1, inp, stcb, net);
6015 #endif
6016         SCTPDBG(SCTP_DEBUG_INPUT1,
6017             "Check for chunk output prw:%d tqe:%d tf=%d\n",
6018             stcb->asoc.peers_rwnd,
6019             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
6020             stcb->asoc.total_flight);
6021         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
6022         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
6023                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
6024         }
6025         if (cnt_ctrl_ready ||
6026             ((un_sent) &&
6027             (stcb->asoc.peers_rwnd > 0 ||
6028             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
6029                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
6030                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
6031                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6032         }
6033 #ifdef SCTP_AUDITING_ENABLED
6034         sctp_audit_log(0xE0, 3);
6035         sctp_auditing(2, inp, stcb, net);
6036 #endif
6037 out:
6038         if (stcb != NULL) {
6039                 SCTP_TCB_UNLOCK(stcb);
6040         }
6041         if (inp_decr != NULL) {
6042                 /* reduce ref-count */
6043                 SCTP_INP_WLOCK(inp_decr);
6044                 SCTP_INP_DECR_REF(inp_decr);
6045                 SCTP_INP_WUNLOCK(inp_decr);
6046         }
6047 #ifdef INVARIANTS
6048         if (inp != NULL) {
6049                 sctp_validate_no_locks(inp);
6050         }
6051 #endif
6052         return;
6053 }
6054
6055 #if 0
6056 static void
6057 sctp_print_mbuf_chain(struct mbuf *m)
6058 {
6059         for (; m; m = SCTP_BUF_NEXT(m)) {
6060                 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
6061                 if (SCTP_BUF_IS_EXTENDED(m))
6062                         SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
6063         }
6064 }
6065
6066 #endif
6067
6068 #ifdef INET
6069 void
6070 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6071 {
6072         struct mbuf *m;
6073         int iphlen;
6074         uint32_t vrf_id = 0;
6075         uint8_t ecn_bits;
6076         struct sockaddr_in src, dst;
6077         struct ip *ip;
6078         struct sctphdr *sh;
6079         struct sctp_chunkhdr *ch;
6080         int length, offset;
6081
6082 #if !defined(SCTP_WITH_NO_CSUM)
6083         uint8_t compute_crc;
6084
6085 #endif
6086         uint32_t mflowid;
6087         uint8_t mflowtype;
6088         uint16_t fibnum;
6089
6090         iphlen = off;
6091         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6092                 SCTP_RELEASE_PKT(i_pak);
6093                 return;
6094         }
6095         m = SCTP_HEADER_TO_CHAIN(i_pak);
6096 #ifdef SCTP_MBUF_LOGGING
6097         /* Log in any input mbufs */
6098         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6099                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6100         }
6101 #endif
6102 #ifdef SCTP_PACKET_LOGGING
6103         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6104                 sctp_packet_log(m);
6105         }
6106 #endif
6107         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6108             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6109             m->m_pkthdr.len,
6110             if_name(m->m_pkthdr.rcvif),
6111             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6112         mflowid = m->m_pkthdr.flowid;
6113         mflowtype = M_HASHTYPE_GET(m);
6114         fibnum = M_GETFIB(m);
6115         SCTP_STAT_INCR(sctps_recvpackets);
6116         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6117         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6118         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6119         if (SCTP_BUF_LEN(m) < offset) {
6120                 if ((m = m_pullup(m, offset)) == NULL) {
6121                         SCTP_STAT_INCR(sctps_hdrops);
6122                         return;
6123                 }
6124         }
6125         ip = mtod(m, struct ip *);
6126         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6127         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6128         offset -= sizeof(struct sctp_chunkhdr);
6129         memset(&src, 0, sizeof(struct sockaddr_in));
6130         src.sin_family = AF_INET;
6131         src.sin_len = sizeof(struct sockaddr_in);
6132         src.sin_port = sh->src_port;
6133         src.sin_addr = ip->ip_src;
6134         memset(&dst, 0, sizeof(struct sockaddr_in));
6135         dst.sin_family = AF_INET;
6136         dst.sin_len = sizeof(struct sockaddr_in);
6137         dst.sin_port = sh->dest_port;
6138         dst.sin_addr = ip->ip_dst;
6139         length = ntohs(ip->ip_len);
6140         /* Validate mbuf chain length with IP payload length. */
6141         if (SCTP_HEADER_LEN(m) != length) {
6142                 SCTPDBG(SCTP_DEBUG_INPUT1,
6143                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6144                 SCTP_STAT_INCR(sctps_hdrops);
6145                 goto out;
6146         }
6147         /* SCTP does not allow broadcasts or multicasts */
6148         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6149                 goto out;
6150         }
6151         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6152                 goto out;
6153         }
6154         ecn_bits = ip->ip_tos;
6155 #if defined(SCTP_WITH_NO_CSUM)
6156         SCTP_STAT_INCR(sctps_recvnocrc);
6157 #else
6158         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6159                 SCTP_STAT_INCR(sctps_recvhwcrc);
6160                 compute_crc = 0;
6161         } else {
6162                 SCTP_STAT_INCR(sctps_recvswcrc);
6163                 compute_crc = 1;
6164         }
6165 #endif
6166         sctp_common_input_processing(&m, iphlen, offset, length,
6167             (struct sockaddr *)&src,
6168             (struct sockaddr *)&dst,
6169             sh, ch,
6170 #if !defined(SCTP_WITH_NO_CSUM)
6171             compute_crc,
6172 #endif
6173             ecn_bits,
6174             mflowtype, mflowid, fibnum,
6175             vrf_id, port);
6176 out:
6177         if (m) {
6178                 sctp_m_freem(m);
6179         }
6180         return;
6181 }
6182
6183 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6184 extern int *sctp_cpuarry;
6185
6186 #endif
6187
6188 void
6189 sctp_input(struct mbuf *m, int off)
6190 {
6191 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6192         struct ip *ip;
6193         struct sctphdr *sh;
6194         int offset;
6195         int cpu_to_use;
6196         uint32_t flowid, tag;
6197
6198         if (mp_ncpus > 1) {
6199                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6200                         flowid = m->m_pkthdr.flowid;
6201                 } else {
6202                         /*
6203                          * No flow id built by lower layers fix it so we
6204                          * create one.
6205                          */
6206                         offset = off + sizeof(struct sctphdr);
6207                         if (SCTP_BUF_LEN(m) < offset) {
6208                                 if ((m = m_pullup(m, offset)) == NULL) {
6209                                         SCTP_STAT_INCR(sctps_hdrops);
6210                                         return;
6211                                 }
6212                         }
6213                         ip = mtod(m, struct ip *);
6214                         sh = (struct sctphdr *)((caddr_t)ip + off);
6215                         tag = htonl(sh->v_tag);
6216                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6217                         m->m_pkthdr.flowid = flowid;
6218                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6219                 }
6220                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6221                 sctp_queue_to_mcore(m, off, cpu_to_use);
6222                 return;
6223         }
6224 #endif
6225         sctp_input_with_port(m, off, 0);
6226 }
6227
6228 #endif