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                         /* We abort with an error of missing mandatory param */
 534                         op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, "");
 535                         if (op_err) {
 536                                 /*
 537                                  * Expand beyond to include the mandatory
 538                                  * param cookie
 539                                  */
 540                                 struct sctp_inv_mandatory_param *mp;
 541
 542                                 SCTP_BUF_LEN(op_err) =
 543                                     sizeof(struct sctp_inv_mandatory_param);
 544                                 mp = mtod(op_err,
 545                                     struct sctp_inv_mandatory_param *);
 546                                 /* Subtract the reserved param */
 547                                 mp->length =
 548                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 549                                 mp->num_param = htonl(1);
 550                                 mp->param = htons(SCTP_STATE_COOKIE);
 551                                 mp->resv = 0;
 552                         }
 553                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 554                             src, dst, sh, op_err,
 555                             mflowtype, mflowid,
 556                             vrf_id, net->port);
 557                         *abort_no_unlock = 1;
 558                 }
 559                 return (retval);
 560         }
 561         return (0);
 562 }
 563
 564 static void
 565 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 566     struct sctp_tcb *stcb, struct sctp_nets *net)
 567 {
 568         union sctp_sockstore store;
 569         struct sctp_nets *r_net, *f_net;
 570         struct timeval tv;
 571         int req_prim = 0;
 572         uint16_t old_error_counter;
 573
 574         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 575                 /* Invalid length */
 576                 return;
 577         }
 578         memset(&store, 0, sizeof(store));
 579         switch (cp->heartbeat.hb_info.addr_family) {
 580 #ifdef INET
 581         case AF_INET:
 582                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 583                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 584                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 585                         store.sin.sin_port = stcb->rport;
 586                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 587                             sizeof(store.sin.sin_addr));
 588                 } else {
 589                         return;
 590                 }
 591                 break;
 592 #endif
 593 #ifdef INET6
 594         case AF_INET6:
 595                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 596                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 597                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 598                         store.sin6.sin6_port = stcb->rport;
 599                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 600                 } else {
 601                         return;
 602                 }
 603                 break;
 604 #endif
 605         default:
 606                 return;
 607         }
 608         r_net = sctp_findnet(stcb, &store.sa);
 609         if (r_net == NULL) {
 610                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 611                 return;
 612         }
 613         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 614             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 615             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 616                 /*
 617                  * If the its a HB and it's random value is correct when can
 618                  * confirm the destination.
 619                  */
 620                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 621                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 622                         stcb->asoc.primary_destination = r_net;
 623                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 624                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 625                         if (f_net != r_net) {
 626                                 /*
 627                                  * first one on the list is NOT the primary
 628                                  * sctp_cmpaddr() is much more efficent if
 629                                  * the primary is the first on the list,
 630                                  * make it so.
 631                                  */
 632                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 633                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 634                         }
 635                         req_prim = 1;
 636                 }
 637                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 638                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 639                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 640                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 641                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 642         }
 643         old_error_counter = r_net->error_count;
 644         r_net->error_count = 0;
 645         r_net->hb_responded = 1;
 646         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 647         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 648         /* Now lets do a RTO with this */
 649         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 650             SCTP_RTT_FROM_NON_DATA);
 651         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 652                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 653                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 654                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 655         }
 656         if (r_net->dest_state & SCTP_ADDR_PF) {
 657                 r_net->dest_state &= ~SCTP_ADDR_PF;
 658                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 659         }
 660         if (old_error_counter > 0) {
 661                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 662                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 663                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 664         }
 665         if (r_net == stcb->asoc.primary_destination) {
 666                 if (stcb->asoc.alternate) {
 667                         /* release the alternate, primary is good */
 668                         sctp_free_remote_addr(stcb->asoc.alternate);
 669                         stcb->asoc.alternate = NULL;
 670                 }
 671         }
 672         /* Mobility adaptation */
 673         if (req_prim) {
 674                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 675                     SCTP_MOBILITY_BASE) ||
 676                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 677                     SCTP_MOBILITY_FASTHANDOFF)) &&
 678                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 679                     SCTP_MOBILITY_PRIM_DELETED)) {
 680
 681                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 682                             stcb->sctp_ep, stcb, NULL,
 683                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 684                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 685                             SCTP_MOBILITY_FASTHANDOFF)) {
 686                                 sctp_assoc_immediate_retrans(stcb,
 687                                     stcb->asoc.primary_destination);
 688                         }
 689                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 690                             SCTP_MOBILITY_BASE)) {
 691                                 sctp_move_chunks_from_net(stcb,
 692                                     stcb->asoc.deleted_primary);
 693                         }
 694                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 695                             stcb->asoc.deleted_primary);
 696                 }
 697         }
 698 }
 699
 700 static int
 701 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 702 {
 703         /*
 704          * return 0 means we want you to proceed with the abort non-zero
 705          * means no abort processing
 706          */
 707         struct sctpasochead *head;
 708
 709         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 710                 /* generate a new vtag and send init */
 711                 LIST_REMOVE(stcb, sctp_asocs);
 712                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 713                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 714                 /*
 715                  * put it in the bucket in the vtag hash of assoc's for the
 716                  * system
 717                  */
 718                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 719                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 720                 return (1);
 721         }
 722         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 723                 /*
 724                  * treat like a case where the cookie expired i.e.: - dump
 725                  * current cookie. - generate a new vtag. - resend init.
 726                  */
 727                 /* generate a new vtag and send init */
 728                 LIST_REMOVE(stcb, sctp_asocs);
 729                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 730                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 731                 sctp_stop_all_cookie_timers(stcb);
 732                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 733                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 734                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 735                 /*
 736                  * put it in the bucket in the vtag hash of assoc's for the
 737                  * system
 738                  */
 739                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 740                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 741                 return (1);
 742         }
 743         return (0);
 744 }
 745
 746 static int
 747 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 748     struct sctp_nets *net)
 749 {
 750         /*
 751          * return 0 means we want you to proceed with the abort non-zero
 752          * means no abort processing
 753          */
 754         if (stcb->asoc.auth_supported == 0) {
 755                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 756                 return (0);
 757         }
 758         sctp_asconf_send_nat_state_update(stcb, net);
 759         return (1);
 760 }
 761
 762
 763 static void
 764 sctp_handle_abort(struct sctp_abort_chunk *abort,
 765     struct sctp_tcb *stcb, struct sctp_nets *net)
 766 {
 767 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 768         struct socket *so;
 769
 770 #endif
 771         uint16_t len;
 772         uint16_t error;
 773
 774         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 775         if (stcb == NULL)
 776                 return;
 777
 778         len = ntohs(abort->ch.chunk_length);
 779         if (len > sizeof(struct sctp_chunkhdr)) {
 780                 /*
 781                  * Need to check the cause codes for our two magic nat
 782                  * aborts which don't kill the assoc necessarily.
 783                  */
 784                 struct sctp_missing_nat_state *natc;
 785
 786                 natc = (struct sctp_missing_nat_state *)(abort + 1);
 787                 error = ntohs(natc->cause);
 788                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 789                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 790                             abort->ch.chunk_flags);
 791                         if (sctp_handle_nat_colliding_state(stcb)) {
 792                                 return;
 793                         }
 794                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 795                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 796                             abort->ch.chunk_flags);
 797                         if (sctp_handle_nat_missing_state(stcb, net)) {
 798                                 return;
 799                         }
 800                 }
 801         } else {
 802                 error = 0;
 803         }
 804         /* stop any receive timers */
 805         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 806             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 807         /* notify user of the abort and clean up... */
 808         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 809         /* free the tcb */
 810         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 811         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 812             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 813                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 814         }
 815 #ifdef SCTP_ASOCLOG_OF_TSNS
 816         sctp_print_out_track_log(stcb);
 817 #endif
 818 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 819         so = SCTP_INP_SO(stcb->sctp_ep);
 820         atomic_add_int(&stcb->asoc.refcnt, 1);
 821         SCTP_TCB_UNLOCK(stcb);
 822         SCTP_SOCKET_LOCK(so, 1);
 823         SCTP_TCB_LOCK(stcb);
 824         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 825 #endif
 826         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 827         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 828             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 829 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 830         SCTP_SOCKET_UNLOCK(so, 1);
 831 #endif
 832         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 833 }
 834
 835 static void
 836 sctp_start_net_timers(struct sctp_tcb *stcb)
 837 {
 838         uint32_t cnt_hb_sent;
 839         struct sctp_nets *net;
 840
 841         cnt_hb_sent = 0;
 842         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 843                 /*
 844                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 845                  * If the dest in unconfirmed send a hb as well if under
 846                  * max_hb_burst have been sent.
 847                  */
 848                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 849                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 850                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 851                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 852                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 853                         cnt_hb_sent++;
 854                 }
 855         }
 856         if (cnt_hb_sent) {
 857                 sctp_chunk_output(stcb->sctp_ep, stcb,
 858                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 859                     SCTP_SO_NOT_LOCKED);
 860         }
 861 }
 862
 863
 864 static void
 865 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 866     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 867 {
 868         struct sctp_association *asoc;
 869         int some_on_streamwheel;
 870
 871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 872         struct socket *so;
 873
 874 #endif
 875
 876         SCTPDBG(SCTP_DEBUG_INPUT2,
 877             "sctp_handle_shutdown: handling SHUTDOWN\n");
 878         if (stcb == NULL)
 879                 return;
 880         asoc = &stcb->asoc;
 881         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 882             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 883                 return;
 884         }
 885         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 886                 /* Shutdown NOT the expected size */
 887                 return;
 888         } else {
 889                 sctp_update_acked(stcb, cp, abort_flag);
 890                 if (*abort_flag) {
 891                         return;
 892                 }
 893         }
 894         if (asoc->control_pdapi) {
 895                 /*
 896                  * With a normal shutdown we assume the end of last record.
 897                  */
 898                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 899                 asoc->control_pdapi->end_added = 1;
 900                 asoc->control_pdapi->pdapi_aborted = 1;
 901                 asoc->control_pdapi = NULL;
 902                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 903 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 904                 so = SCTP_INP_SO(stcb->sctp_ep);
 905                 atomic_add_int(&stcb->asoc.refcnt, 1);
 906                 SCTP_TCB_UNLOCK(stcb);
 907                 SCTP_SOCKET_LOCK(so, 1);
 908                 SCTP_TCB_LOCK(stcb);
 909                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 910                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 911                         /* assoc was freed while we were unlocked */
 912                         SCTP_SOCKET_UNLOCK(so, 1);
 913                         return;
 914                 }
 915 #endif
 916                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 917 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 918                 SCTP_SOCKET_UNLOCK(so, 1);
 919 #endif
 920         }
 921         /* goto SHUTDOWN_RECEIVED state to block new requests */
 922         if (stcb->sctp_socket) {
 923                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 924                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 925                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 926                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 927                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 928                         /*
 929                          * notify upper layer that peer has initiated a
 930                          * shutdown
 931                          */
 932                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 933
 934                         /* reset time */
 935                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 936                 }
 937         }
 938         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 939                 /*
 940                  * stop the shutdown timer, since we WILL move to
 941                  * SHUTDOWN-ACK-SENT.
 942                  */
 943                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 944                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 945         }
 946         /* Now is there unsent data on a stream somewhere? */
 947         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 948
 949         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 950             !TAILQ_EMPTY(&asoc->sent_queue) ||
 951             some_on_streamwheel) {
 952                 /* By returning we will push more data out */
 953                 return;
 954         } else {
 955                 /* no outstanding data to send, so move on... */
 956                 /* send SHUTDOWN-ACK */
 957                 /* move to SHUTDOWN-ACK-SENT state */
 958                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 959                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 960                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 961                 }
 962                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 963                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 964                 sctp_stop_timers_for_shutdown(stcb);
 965                 sctp_send_shutdown_ack(stcb, net);
 966                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 967                     stcb, net);
 968         }
 969 }
 970
 971 static void
 972 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 973     struct sctp_tcb *stcb,
 974     struct sctp_nets *net)
 975 {
 976         struct sctp_association *asoc;
 977
 978 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 979         struct socket *so;
 980
 981         so = SCTP_INP_SO(stcb->sctp_ep);
 982 #endif
 983         SCTPDBG(SCTP_DEBUG_INPUT2,
 984             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 985         if (stcb == NULL)
 986                 return;
 987
 988         asoc = &stcb->asoc;
 989         /* process according to association state */
 990         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 991             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 992                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 993                 sctp_send_shutdown_complete(stcb, net, 1);
 994                 SCTP_TCB_UNLOCK(stcb);
 995                 return;
 996         }
 997         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 998             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 999                 /* unexpected SHUTDOWN-ACK... so ignore... */
1000                 SCTP_TCB_UNLOCK(stcb);
1001                 return;
1002         }
1003         if (asoc->control_pdapi) {
1004                 /*
1005                  * With a normal shutdown we assume the end of last record.
1006                  */
1007                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1008                 asoc->control_pdapi->end_added = 1;
1009                 asoc->control_pdapi->pdapi_aborted = 1;
1010                 asoc->control_pdapi = NULL;
1011                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1012 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1013                 atomic_add_int(&stcb->asoc.refcnt, 1);
1014                 SCTP_TCB_UNLOCK(stcb);
1015                 SCTP_SOCKET_LOCK(so, 1);
1016                 SCTP_TCB_LOCK(stcb);
1017                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1018                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1019                         /* assoc was freed while we were unlocked */
1020                         SCTP_SOCKET_UNLOCK(so, 1);
1021                         return;
1022                 }
1023 #endif
1024                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1025 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1026                 SCTP_SOCKET_UNLOCK(so, 1);
1027 #endif
1028         }
1029 #ifdef INVARIANTS
1030         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1031             !TAILQ_EMPTY(&asoc->sent_queue) ||
1032             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1033                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1034         }
1035 #endif
1036         /* stop the timer */
1037         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1038             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1039         /* send SHUTDOWN-COMPLETE */
1040         sctp_send_shutdown_complete(stcb, net, 0);
1041         /* notify upper layer protocol */
1042         if (stcb->sctp_socket) {
1043                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1044                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1045                         stcb->sctp_socket->so_snd.sb_cc = 0;
1046                 }
1047                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1048         }
1049         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1050         /* free the TCB but first save off the ep */
1051 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1052         atomic_add_int(&stcb->asoc.refcnt, 1);
1053         SCTP_TCB_UNLOCK(stcb);
1054         SCTP_SOCKET_LOCK(so, 1);
1055         SCTP_TCB_LOCK(stcb);
1056         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1057 #endif
1058         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1059             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1060 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1061         SCTP_SOCKET_UNLOCK(so, 1);
1062 #endif
1063 }
1064
1065 /*
1066  * Skip past the param header and then we will find the chunk that caused the
1067  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1068  * our peer must be broken.
1069  */
1070 static void
1071 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1072     struct sctp_nets *net)
1073 {
1074         struct sctp_chunkhdr *chk;
1075
1076         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1077         switch (chk->chunk_type) {
1078         case SCTP_ASCONF_ACK:
1079         case SCTP_ASCONF:
1080                 sctp_asconf_cleanup(stcb, net);
1081                 break;
1082         case SCTP_FORWARD_CUM_TSN:
1083                 stcb->asoc.prsctp_supported = 0;
1084                 break;
1085         default:
1086                 SCTPDBG(SCTP_DEBUG_INPUT2,
1087                     "Peer does not support chunk type %d(%x)??\n",
1088                     chk->chunk_type, (uint32_t) chk->chunk_type);
1089                 break;
1090         }
1091 }
1092
1093 /*
1094  * Skip past the param header and then we will find the param that caused the
1095  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1096  * these will turn of specific features.
1097  * XXX: Is this the right thing to do?
1098  */
1099 static void
1100 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1101 {
1102         struct sctp_paramhdr *pbad;
1103
1104         pbad = phdr + 1;
1105         switch (ntohs(pbad->param_type)) {
1106                 /* pr-sctp draft */
1107         case SCTP_PRSCTP_SUPPORTED:
1108                 stcb->asoc.prsctp_supported = 0;
1109                 break;
1110         case SCTP_SUPPORTED_CHUNK_EXT:
1111                 break;
1112                 /* draft-ietf-tsvwg-addip-sctp */
1113         case SCTP_HAS_NAT_SUPPORT:
1114                 stcb->asoc.peer_supports_nat = 0;
1115                 break;
1116         case SCTP_ADD_IP_ADDRESS:
1117         case SCTP_DEL_IP_ADDRESS:
1118         case SCTP_SET_PRIM_ADDR:
1119                 stcb->asoc.asconf_supported = 0;
1120                 break;
1121         case SCTP_SUCCESS_REPORT:
1122         case SCTP_ERROR_CAUSE_IND:
1123                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1124                 SCTPDBG(SCTP_DEBUG_INPUT2,
1125                     "Turning off ASCONF to this strange peer\n");
1126                 stcb->asoc.asconf_supported = 0;
1127                 break;
1128         default:
1129                 SCTPDBG(SCTP_DEBUG_INPUT2,
1130                     "Peer does not support param type %d(%x)??\n",
1131                     pbad->param_type, (uint32_t) pbad->param_type);
1132                 break;
1133         }
1134 }
1135
1136 static int
1137 sctp_handle_error(struct sctp_chunkhdr *ch,
1138     struct sctp_tcb *stcb, struct sctp_nets *net)
1139 {
1140         int chklen;
1141         struct sctp_paramhdr *phdr;
1142         uint16_t error, error_type;
1143         uint16_t error_len;
1144         struct sctp_association *asoc;
1145         int adjust;
1146
1147 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1148         struct socket *so;
1149
1150 #endif
1151
1152         /* parse through all of the errors and process */
1153         asoc = &stcb->asoc;
1154         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1155             sizeof(struct sctp_chunkhdr));
1156         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1157         error = 0;
1158         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1159                 /* Process an Error Cause */
1160                 error_type = ntohs(phdr->param_type);
1161                 error_len = ntohs(phdr->param_length);
1162                 if ((error_len > chklen) || (error_len == 0)) {
1163                         /* invalid param length for this param */
1164                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1165                             chklen, error_len);
1166                         return (0);
1167                 }
1168                 if (error == 0) {
1169                         /* report the first error cause */
1170                         error = error_type;
1171                 }
1172                 switch (error_type) {
1173                 case SCTP_CAUSE_INVALID_STREAM:
1174                 case SCTP_CAUSE_MISSING_PARAM:
1175                 case SCTP_CAUSE_INVALID_PARAM:
1176                 case SCTP_CAUSE_NO_USER_DATA:
1177                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1178                             error_type);
1179                         break;
1180                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1181                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1182                             ch->chunk_flags);
1183                         if (sctp_handle_nat_colliding_state(stcb)) {
1184                                 return (0);
1185                         }
1186                         break;
1187                 case SCTP_CAUSE_NAT_MISSING_STATE:
1188                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1189                             ch->chunk_flags);
1190                         if (sctp_handle_nat_missing_state(stcb, net)) {
1191                                 return (0);
1192                         }
1193                         break;
1194                 case SCTP_CAUSE_STALE_COOKIE:
1195                         /*
1196                          * We only act if we have echoed a cookie and are
1197                          * waiting.
1198                          */
1199                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1200                                 int *p;
1201
1202                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1203                                 /* Save the time doubled */
1204                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1205                                 asoc->stale_cookie_count++;
1206                                 if (asoc->stale_cookie_count >
1207                                     asoc->max_init_times) {
1208                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1209                                         /* now free the asoc */
1210 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1211                                         so = SCTP_INP_SO(stcb->sctp_ep);
1212                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1213                                         SCTP_TCB_UNLOCK(stcb);
1214                                         SCTP_SOCKET_LOCK(so, 1);
1215                                         SCTP_TCB_LOCK(stcb);
1216                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1217 #endif
1218                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1219                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1220 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1221                                         SCTP_SOCKET_UNLOCK(so, 1);
1222 #endif
1223                                         return (-1);
1224                                 }
1225                                 /* blast back to INIT state */
1226                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1227                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1228                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1229                                 sctp_stop_all_cookie_timers(stcb);
1230                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1231                         }
1232                         break;
1233                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1234                         /*
1235                          * Nothing we can do here, we don't do hostname
1236                          * addresses so if the peer does not like my IPv6
1237                          * (or IPv4 for that matter) it does not matter. If
1238                          * they don't support that type of address, they can
1239                          * NOT possibly get that packet type... i.e. with no
1240                          * IPv6 you can't recieve a IPv6 packet. so we can
1241                          * safely ignore this one. If we ever added support
1242                          * for HOSTNAME Addresses, then we would need to do
1243                          * something here.
1244                          */
1245                         break;
1246                 case SCTP_CAUSE_UNRECOG_CHUNK:
1247                         sctp_process_unrecog_chunk(stcb, phdr, net);
1248                         break;
1249                 case SCTP_CAUSE_UNRECOG_PARAM:
1250                         sctp_process_unrecog_param(stcb, phdr);
1251                         break;
1252                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1253                         /*
1254                          * We ignore this since the timer will drive out a
1255                          * new cookie anyway and there timer will drive us
1256                          * to send a SHUTDOWN_COMPLETE. We can't send one
1257                          * here since we don't have their tag.
1258                          */
1259                         break;
1260                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1261                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1262                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1263                         /*
1264                          * We should NOT get these here, but in a
1265                          * ASCONF-ACK.
1266                          */
1267                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1268                             error_type);
1269                         break;
1270                 case SCTP_CAUSE_OUT_OF_RESC:
1271                         /*
1272                          * And what, pray tell do we do with the fact that
1273                          * the peer is out of resources? Not really sure we
1274                          * could do anything but abort. I suspect this
1275                          * should have came WITH an abort instead of in a
1276                          * OP-ERROR.
1277                          */
1278                         break;
1279                 default:
1280                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1281                             error_type);
1282                         break;
1283                 }
1284                 adjust = SCTP_SIZE32(error_len);
1285                 chklen -= adjust;
1286                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1287         }
1288         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1289         return (0);
1290 }
1291
1292 static int
1293 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1294     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1295     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1296     struct sctp_nets *net, int *abort_no_unlock,
1297     uint8_t mflowtype, uint32_t mflowid,
1298     uint32_t vrf_id)
1299 {
1300         struct sctp_init_ack *init_ack;
1301         struct mbuf *op_err;
1302
1303         SCTPDBG(SCTP_DEBUG_INPUT2,
1304             "sctp_handle_init_ack: handling INIT-ACK\n");
1305
1306         if (stcb == NULL) {
1307                 SCTPDBG(SCTP_DEBUG_INPUT2,
1308                     "sctp_handle_init_ack: TCB is null\n");
1309                 return (-1);
1310         }
1311         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1312                 /* Invalid length */
1313                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1314                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1315                     src, dst, sh, op_err,
1316                     mflowtype, mflowid,
1317                     vrf_id, net->port);
1318                 *abort_no_unlock = 1;
1319                 return (-1);
1320         }
1321         init_ack = &cp->init;
1322         /* validate parameters */
1323         if (init_ack->initiate_tag == 0) {
1324                 /* protocol error... send an abort */
1325                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1326                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1327                     src, dst, sh, op_err,
1328                     mflowtype, mflowid,
1329                     vrf_id, net->port);
1330                 *abort_no_unlock = 1;
1331                 return (-1);
1332         }
1333         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1334                 /* protocol error... send an abort */
1335                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1336                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1337                     src, dst, sh, op_err,
1338                     mflowtype, mflowid,
1339                     vrf_id, net->port);
1340                 *abort_no_unlock = 1;
1341                 return (-1);
1342         }
1343         if (init_ack->num_inbound_streams == 0) {
1344                 /* protocol error... send an abort */
1345                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1346                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1347                     src, dst, sh, op_err,
1348                     mflowtype, mflowid,
1349                     vrf_id, net->port);
1350                 *abort_no_unlock = 1;
1351                 return (-1);
1352         }
1353         if (init_ack->num_outbound_streams == 0) {
1354                 /* protocol error... send an abort */
1355                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1356                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1357                     src, dst, sh, op_err,
1358                     mflowtype, mflowid,
1359                     vrf_id, net->port);
1360                 *abort_no_unlock = 1;
1361                 return (-1);
1362         }
1363         /* process according to association state... */
1364         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1365         case SCTP_STATE_COOKIE_WAIT:
1366                 /* this is the expected state for this chunk */
1367                 /* process the INIT-ACK parameters */
1368                 if (stcb->asoc.primary_destination->dest_state &
1369                     SCTP_ADDR_UNCONFIRMED) {
1370                         /*
1371                          * The primary is where we sent the INIT, we can
1372                          * always consider it confirmed when the INIT-ACK is
1373                          * returned. Do this before we load addresses
1374                          * though.
1375                          */
1376                         stcb->asoc.primary_destination->dest_state &=
1377                             ~SCTP_ADDR_UNCONFIRMED;
1378                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1379                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1380                 }
1381                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1382                     net, abort_no_unlock,
1383                     mflowtype, mflowid,
1384                     vrf_id) < 0) {
1385                         /* error in parsing parameters */
1386                         return (-1);
1387                 }
1388                 /* update our state */
1389                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1390                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1391
1392                 /* reset the RTO calc */
1393                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1394                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1395                             stcb->asoc.overall_error_count,
1396                             0,
1397                             SCTP_FROM_SCTP_INPUT,
1398                             __LINE__);
1399                 }
1400                 stcb->asoc.overall_error_count = 0;
1401                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1402                 /*
1403                  * collapse the init timer back in case of a exponential
1404                  * backoff
1405                  */
1406                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1407                     stcb, net);
1408                 /*
1409                  * the send at the end of the inbound data processing will
1410                  * cause the cookie to be sent
1411                  */
1412                 break;
1413         case SCTP_STATE_SHUTDOWN_SENT:
1414                 /* incorrect state... discard */
1415                 break;
1416         case SCTP_STATE_COOKIE_ECHOED:
1417                 /* incorrect state... discard */
1418                 break;
1419         case SCTP_STATE_OPEN:
1420                 /* incorrect state... discard */
1421                 break;
1422         case SCTP_STATE_EMPTY:
1423         case SCTP_STATE_INUSE:
1424         default:
1425                 /* incorrect state... discard */
1426                 return (-1);
1427                 break;
1428         }
1429         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1430         return (0);
1431 }
1432
1433 static struct sctp_tcb *
1434 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1435     struct sockaddr *src, struct sockaddr *dst,
1436     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1437     struct sctp_inpcb *inp, struct sctp_nets **netp,
1438     struct sockaddr *init_src, int *notification,
1439     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1440     uint8_t mflowtype, uint32_t mflowid,
1441     uint32_t vrf_id, uint16_t port);
1442
1443
1444 /*
1445  * handle a state cookie for an existing association m: input packet mbuf
1446  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1447  * "split" mbuf and the cookie signature does not exist offset: offset into
1448  * mbuf to the cookie-echo chunk
1449  */
1450 static struct sctp_tcb *
1451 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1452     struct sockaddr *src, struct sockaddr *dst,
1453     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1454     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1455     struct sockaddr *init_src, int *notification,
1456     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1457     uint8_t mflowtype, uint32_t mflowid,
1458     uint32_t vrf_id, uint16_t port)
1459 {
1460         struct sctp_association *asoc;
1461         struct sctp_init_chunk *init_cp, init_buf;
1462         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1463         struct sctp_nets *net;
1464         struct mbuf *op_err;
1465         int init_offset, initack_offset, i;
1466         int retval;
1467         int spec_flag = 0;
1468         uint32_t how_indx;
1469
1470 #if defined(SCTP_DETAILED_STR_STATS)
1471         int j;
1472
1473 #endif
1474
1475         net = *netp;
1476         /* I know that the TCB is non-NULL from the caller */
1477         asoc = &stcb->asoc;
1478         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1479                 if (asoc->cookie_how[how_indx] == 0)
1480                         break;
1481         }
1482         if (how_indx < sizeof(asoc->cookie_how)) {
1483                 asoc->cookie_how[how_indx] = 1;
1484         }
1485         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1486                 /* SHUTDOWN came in after sending INIT-ACK */
1487                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1488                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1489                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1490                     mflowtype, mflowid, inp->fibnum,
1491                     vrf_id, net->port);
1492                 if (how_indx < sizeof(asoc->cookie_how))
1493                         asoc->cookie_how[how_indx] = 2;
1494                 return (NULL);
1495         }
1496         /*
1497          * find and validate the INIT chunk in the cookie (peer's info) the
1498          * INIT should start after the cookie-echo header struct (chunk
1499          * header, state cookie header struct)
1500          */
1501         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1502
1503         init_cp = (struct sctp_init_chunk *)
1504             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1505             (uint8_t *) & init_buf);
1506         if (init_cp == NULL) {
1507                 /* could not pull a INIT chunk in cookie */
1508                 return (NULL);
1509         }
1510         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1511                 return (NULL);
1512         }
1513         /*
1514          * find and validate the INIT-ACK chunk in the cookie (my info) the
1515          * INIT-ACK follows the INIT chunk
1516          */
1517         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1518         initack_cp = (struct sctp_init_ack_chunk *)
1519             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1520             (uint8_t *) & initack_buf);
1521         if (initack_cp == NULL) {
1522                 /* could not pull INIT-ACK chunk in cookie */
1523                 return (NULL);
1524         }
1525         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1526                 return (NULL);
1527         }
1528         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1529             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1530                 /*
1531                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1532                  * to get into the OPEN state
1533                  */
1534                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1535                         /*-
1536                          * Opps, this means that we somehow generated two vtag's
1537                          * the same. I.e. we did:
1538                          *  Us               Peer
1539                          *   <---INIT(tag=a)------
1540                          *   ----INIT-ACK(tag=t)-->
1541                          *   ----INIT(tag=t)------> *1
1542                          *   <---INIT-ACK(tag=a)---
1543                          *   <----CE(tag=t)------------- *2
1544                          *
1545                          * At point *1 we should be generating a different
1546                          * tag t'. Which means we would throw away the CE and send
1547                          * ours instead. Basically this is case C (throw away side).
1548                          */
1549                         if (how_indx < sizeof(asoc->cookie_how))
1550                                 asoc->cookie_how[how_indx] = 17;
1551                         return (NULL);
1552
1553                 }
1554                 switch (SCTP_GET_STATE(asoc)) {
1555                 case SCTP_STATE_COOKIE_WAIT:
1556                 case SCTP_STATE_COOKIE_ECHOED:
1557                         /*
1558                          * INIT was sent but got a COOKIE_ECHO with the
1559                          * correct tags... just accept it...but we must
1560                          * process the init so that we can make sure we have
1561                          * the right seq no's.
1562                          */
1563                         /* First we must process the INIT !! */
1564                         retval = sctp_process_init(init_cp, stcb);
1565                         if (retval < 0) {
1566                                 if (how_indx < sizeof(asoc->cookie_how))
1567                                         asoc->cookie_how[how_indx] = 3;
1568                                 return (NULL);
1569                         }
1570                         /* we have already processed the INIT so no problem */
1571                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1572                             stcb, net,
1573                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1574                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1575                             stcb, net,
1576                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1577                         /* update current state */
1578                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1579                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1580                         else
1581                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1582
1583                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1584                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1585                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1586                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1587                         }
1588                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1589                         sctp_stop_all_cookie_timers(stcb);
1590                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1591                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1592                             (inp->sctp_socket->so_qlimit == 0)
1593                             ) {
1594 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1595                                 struct socket *so;
1596
1597 #endif
1598                                 /*
1599                                  * Here is where collision would go if we
1600                                  * did a connect() and instead got a
1601                                  * init/init-ack/cookie done before the
1602                                  * init-ack came back..
1603                                  */
1604                                 stcb->sctp_ep->sctp_flags |=
1605                                     SCTP_PCB_FLAGS_CONNECTED;
1606 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1607                                 so = SCTP_INP_SO(stcb->sctp_ep);
1608                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1609                                 SCTP_TCB_UNLOCK(stcb);
1610                                 SCTP_SOCKET_LOCK(so, 1);
1611                                 SCTP_TCB_LOCK(stcb);
1612                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1613                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1614                                         SCTP_SOCKET_UNLOCK(so, 1);
1615                                         return (NULL);
1616                                 }
1617 #endif
1618                                 soisconnected(stcb->sctp_socket);
1619 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1620                                 SCTP_SOCKET_UNLOCK(so, 1);
1621 #endif
1622                         }
1623                         /* notify upper layer */
1624                         *notification = SCTP_NOTIFY_ASSOC_UP;
1625                         /*
1626                          * since we did not send a HB make sure we don't
1627                          * double things
1628                          */
1629                         net->hb_responded = 1;
1630                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1631                             &cookie->time_entered,
1632                             sctp_align_unsafe_makecopy,
1633                             SCTP_RTT_FROM_NON_DATA);
1634
1635                         if (stcb->asoc.sctp_autoclose_ticks &&
1636                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1637                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1638                                     inp, stcb, NULL);
1639                         }
1640                         break;
1641                 default:
1642                         /*
1643                          * we're in the OPEN state (or beyond), so peer must
1644                          * have simply lost the COOKIE-ACK
1645                          */
1646                         break;
1647                 }               /* end switch */
1648                 sctp_stop_all_cookie_timers(stcb);
1649                 /*
1650                  * We ignore the return code here.. not sure if we should
1651                  * somehow abort.. but we do have an existing asoc. This
1652                  * really should not fail.
1653                  */
1654                 if (sctp_load_addresses_from_init(stcb, m,
1655                     init_offset + sizeof(struct sctp_init_chunk),
1656                     initack_offset, src, dst, init_src)) {
1657                         if (how_indx < sizeof(asoc->cookie_how))
1658                                 asoc->cookie_how[how_indx] = 4;
1659                         return (NULL);
1660                 }
1661                 /* respond with a COOKIE-ACK */
1662                 sctp_toss_old_cookies(stcb, asoc);
1663                 sctp_send_cookie_ack(stcb);
1664                 if (how_indx < sizeof(asoc->cookie_how))
1665                         asoc->cookie_how[how_indx] = 5;
1666                 return (stcb);
1667         }
1668         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1669             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1670             cookie->tie_tag_my_vtag == 0 &&
1671             cookie->tie_tag_peer_vtag == 0) {
1672                 /*
1673                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1674                  */
1675                 if (how_indx < sizeof(asoc->cookie_how))
1676                         asoc->cookie_how[how_indx] = 6;
1677                 return (NULL);
1678         }
1679         /*
1680          * If nat support, and the below and stcb is established, send back
1681          * a ABORT(colliding state) if we are established.
1682          */
1683         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1684             (asoc->peer_supports_nat) &&
1685             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1686             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1687             (asoc->peer_vtag == 0)))) {
1688                 /*
1689                  * Special case - Peer's support nat. We may have two init's
1690                  * that we gave out the same tag on since one was not
1691                  * established.. i.e. we get INIT from host-1 behind the nat
1692                  * and we respond tag-a, we get a INIT from host-2 behind
1693                  * the nat and we get tag-a again. Then we bring up host-1
1694                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1695                  * Now we have colliding state. We must send an abort here
1696                  * with colliding state indication.
1697                  */
1698                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1699                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1700                     mflowtype, mflowid, inp->fibnum,
1701                     vrf_id, port);
1702                 return (NULL);
1703         }
1704         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1705             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1706             (asoc->peer_vtag == 0))) {
1707                 /*
1708                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1709                  * should be ok, re-accept peer info
1710                  */
1711                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1712                         /*
1713                          * Extension of case C. If we hit this, then the
1714                          * random number generator returned the same vtag
1715                          * when we first sent our INIT-ACK and when we later
1716                          * sent our INIT. The side with the seq numbers that
1717                          * are different will be the one that normnally
1718                          * would have hit case C. This in effect "extends"
1719                          * our vtags in this collision case to be 64 bits.
1720                          * The same collision could occur aka you get both
1721                          * vtag and seq number the same twice in a row.. but
1722                          * is much less likely. If it did happen then we
1723                          * would proceed through and bring up the assoc.. we
1724                          * may end up with the wrong stream setup however..
1725                          * which would be bad.. but there is no way to
1726                          * tell.. until we send on a stream that does not
1727                          * exist :-)
1728                          */
1729                         if (how_indx < sizeof(asoc->cookie_how))
1730                                 asoc->cookie_how[how_indx] = 7;
1731
1732                         return (NULL);
1733                 }
1734                 if (how_indx < sizeof(asoc->cookie_how))
1735                         asoc->cookie_how[how_indx] = 8;
1736                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1737                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1738                 sctp_stop_all_cookie_timers(stcb);
1739                 /*
1740                  * since we did not send a HB make sure we don't double
1741                  * things
1742                  */
1743                 net->hb_responded = 1;
1744                 if (stcb->asoc.sctp_autoclose_ticks &&
1745                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1746                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1747                             NULL);
1748                 }
1749                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1750                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1751
1752                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1753                         /*
1754                          * Ok the peer probably discarded our data (if we
1755                          * echoed a cookie+data). So anything on the
1756                          * sent_queue should be marked for retransmit, we
1757                          * may not get something to kick us so it COULD
1758                          * still take a timeout to move these.. but it can't
1759                          * hurt to mark them.
1760                          */
1761                         struct sctp_tmit_chunk *chk;
1762
1763                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1764                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1765                                         chk->sent = SCTP_DATAGRAM_RESEND;
1766                                         sctp_flight_size_decrease(chk);
1767                                         sctp_total_flight_decrease(stcb, chk);
1768                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1769                                         spec_flag++;
1770                                 }
1771                         }
1772
1773                 }
1774                 /* process the INIT info (peer's info) */
1775                 retval = sctp_process_init(init_cp, stcb);
1776                 if (retval < 0) {
1777                         if (how_indx < sizeof(asoc->cookie_how))
1778                                 asoc->cookie_how[how_indx] = 9;
1779                         return (NULL);
1780                 }
1781                 if (sctp_load_addresses_from_init(stcb, m,
1782                     init_offset + sizeof(struct sctp_init_chunk),
1783                     initack_offset, src, dst, init_src)) {
1784                         if (how_indx < sizeof(asoc->cookie_how))
1785                                 asoc->cookie_how[how_indx] = 10;
1786                         return (NULL);
1787                 }
1788                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1789                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1790                         *notification = SCTP_NOTIFY_ASSOC_UP;
1791
1792                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1793                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1794                             (inp->sctp_socket->so_qlimit == 0)) {
1795 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1796                                 struct socket *so;
1797
1798 #endif
1799                                 stcb->sctp_ep->sctp_flags |=
1800                                     SCTP_PCB_FLAGS_CONNECTED;
1801 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1802                                 so = SCTP_INP_SO(stcb->sctp_ep);
1803                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1804                                 SCTP_TCB_UNLOCK(stcb);
1805                                 SCTP_SOCKET_LOCK(so, 1);
1806                                 SCTP_TCB_LOCK(stcb);
1807                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1808                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1809                                         SCTP_SOCKET_UNLOCK(so, 1);
1810                                         return (NULL);
1811                                 }
1812 #endif
1813                                 soisconnected(stcb->sctp_socket);
1814 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1815                                 SCTP_SOCKET_UNLOCK(so, 1);
1816 #endif
1817                         }
1818                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1819                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1820                         else
1821                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1822                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1823                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1824                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1825                 } else {
1826                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1827                 }
1828                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1829                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1830                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1831                             stcb->sctp_ep, stcb, asoc->primary_destination);
1832                 }
1833                 sctp_stop_all_cookie_timers(stcb);
1834                 sctp_toss_old_cookies(stcb, asoc);
1835                 sctp_send_cookie_ack(stcb);
1836                 if (spec_flag) {
1837                         /*
1838                          * only if we have retrans set do we do this. What
1839                          * this call does is get only the COOKIE-ACK out and
1840                          * then when we return the normal call to
1841                          * sctp_chunk_output will get the retrans out behind
1842                          * this.
1843                          */
1844                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1845                 }
1846                 if (how_indx < sizeof(asoc->cookie_how))
1847                         asoc->cookie_how[how_indx] = 11;
1848
1849                 return (stcb);
1850         }
1851         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1852             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1853             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1854             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1855             cookie->tie_tag_peer_vtag != 0) {
1856                 struct sctpasochead *head;
1857
1858 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1859                 struct socket *so;
1860
1861 #endif
1862
1863                 if (asoc->peer_supports_nat) {
1864                         /*
1865                          * This is a gross gross hack. Just call the
1866                          * cookie_new code since we are allowing a duplicate
1867                          * association. I hope this works...
1868                          */
1869                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1870                             sh, cookie, cookie_len,
1871                             inp, netp, init_src, notification,
1872                             auth_skipped, auth_offset, auth_len,
1873                             mflowtype, mflowid,
1874                             vrf_id, port));
1875                 }
1876                 /*
1877                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1878                  */
1879                 /* temp code */
1880                 if (how_indx < sizeof(asoc->cookie_how))
1881                         asoc->cookie_how[how_indx] = 12;
1882                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1883                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1884                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1885                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1886
1887                 /* notify upper layer */
1888                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1889                 atomic_add_int(&stcb->asoc.refcnt, 1);
1890                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1891                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1892                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1893                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1894                 }
1895                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1896                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1897                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1898                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1899                 }
1900                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1901                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1902                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1903                             stcb->sctp_ep, stcb, asoc->primary_destination);
1904
1905                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1906                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1907                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1908                 }
1909                 asoc->pre_open_streams =
1910                     ntohs(initack_cp->init.num_outbound_streams);
1911                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1912                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1913                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1914
1915                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1916
1917                 asoc->str_reset_seq_in = asoc->init_seq_number;
1918
1919                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1920                 if (asoc->mapping_array) {
1921                         memset(asoc->mapping_array, 0,
1922                             asoc->mapping_array_size);
1923                 }
1924                 if (asoc->nr_mapping_array) {
1925                         memset(asoc->nr_mapping_array, 0,
1926                             asoc->mapping_array_size);
1927                 }
1928                 SCTP_TCB_UNLOCK(stcb);
1929 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1930                 so = SCTP_INP_SO(stcb->sctp_ep);
1931                 SCTP_SOCKET_LOCK(so, 1);
1932 #endif
1933                 SCTP_INP_INFO_WLOCK();
1934                 SCTP_INP_WLOCK(stcb->sctp_ep);
1935                 SCTP_TCB_LOCK(stcb);
1936                 atomic_add_int(&stcb->asoc.refcnt, -1);
1937                 /* send up all the data */
1938                 SCTP_TCB_SEND_LOCK(stcb);
1939
1940                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1941                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1942                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1943 #if defined(SCTP_DETAILED_STR_STATS)
1944                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1945                                 asoc->strmout[i].abandoned_sent[j] = 0;
1946                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1947                         }
1948 #else
1949                         asoc->strmout[i].abandoned_sent[0] = 0;
1950                         asoc->strmout[i].abandoned_unsent[0] = 0;
1951 #endif
1952                         stcb->asoc.strmout[i].stream_no = i;
1953                         stcb->asoc.strmout[i].next_sequence_send = 0;
1954                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1955                 }
1956                 /* process the INIT-ACK info (my info) */
1957                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1958                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1959
1960                 /* pull from vtag hash */
1961                 LIST_REMOVE(stcb, sctp_asocs);
1962                 /* re-insert to new vtag position */
1963                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1964                     SCTP_BASE_INFO(hashasocmark))];
1965                 /*
1966                  * put it in the bucket in the vtag hash of assoc's for the
1967                  * system
1968                  */
1969                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1970
1971                 SCTP_TCB_SEND_UNLOCK(stcb);
1972                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1973                 SCTP_INP_INFO_WUNLOCK();
1974 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1975                 SCTP_SOCKET_UNLOCK(so, 1);
1976 #endif
1977                 asoc->total_flight = 0;
1978                 asoc->total_flight_count = 0;
1979                 /* process the INIT info (peer's info) */
1980                 retval = sctp_process_init(init_cp, stcb);
1981                 if (retval < 0) {
1982                         if (how_indx < sizeof(asoc->cookie_how))
1983                                 asoc->cookie_how[how_indx] = 13;
1984
1985                         return (NULL);
1986                 }
1987                 /*
1988                  * since we did not send a HB make sure we don't double
1989                  * things
1990                  */
1991                 net->hb_responded = 1;
1992
1993                 if (sctp_load_addresses_from_init(stcb, m,
1994                     init_offset + sizeof(struct sctp_init_chunk),
1995                     initack_offset, src, dst, init_src)) {
1996                         if (how_indx < sizeof(asoc->cookie_how))
1997                                 asoc->cookie_how[how_indx] = 14;
1998
1999                         return (NULL);
2000                 }
2001                 /* respond with a COOKIE-ACK */
2002                 sctp_stop_all_cookie_timers(stcb);
2003                 sctp_toss_old_cookies(stcb, asoc);
2004                 sctp_send_cookie_ack(stcb);
2005                 if (how_indx < sizeof(asoc->cookie_how))
2006                         asoc->cookie_how[how_indx] = 15;
2007
2008                 return (stcb);
2009         }
2010         if (how_indx < sizeof(asoc->cookie_how))
2011                 asoc->cookie_how[how_indx] = 16;
2012         /* all other cases... */
2013         return (NULL);
2014 }
2015
2016
2017 /*
2018  * handle a state cookie for a new association m: input packet mbuf chain--
2019  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2020  * and the cookie signature does not exist offset: offset into mbuf to the
2021  * cookie-echo chunk length: length of the cookie chunk to: where the init
2022  * was from returns a new TCB
2023  */
2024 static struct sctp_tcb *
2025 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2026     struct sockaddr *src, struct sockaddr *dst,
2027     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2028     struct sctp_inpcb *inp, struct sctp_nets **netp,
2029     struct sockaddr *init_src, int *notification,
2030     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2031     uint8_t mflowtype, uint32_t mflowid,
2032     uint32_t vrf_id, uint16_t port)
2033 {
2034         struct sctp_tcb *stcb;
2035         struct sctp_init_chunk *init_cp, init_buf;
2036         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2037         union sctp_sockstore store;
2038         struct sctp_association *asoc;
2039         int init_offset, initack_offset, initack_limit;
2040         int retval;
2041         int error = 0;
2042         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2043
2044 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2045         struct socket *so;
2046
2047         so = SCTP_INP_SO(inp);
2048 #endif
2049
2050         /*
2051          * find and validate the INIT chunk in the cookie (peer's info) the
2052          * INIT should start after the cookie-echo header struct (chunk
2053          * header, state cookie header struct)
2054          */
2055         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2056         init_cp = (struct sctp_init_chunk *)
2057             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2058             (uint8_t *) & init_buf);
2059         if (init_cp == NULL) {
2060                 /* could not pull a INIT chunk in cookie */
2061                 SCTPDBG(SCTP_DEBUG_INPUT1,
2062                     "process_cookie_new: could not pull INIT chunk hdr\n");
2063                 return (NULL);
2064         }
2065         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2066                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2067                 return (NULL);
2068         }
2069         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2070         /*
2071          * find and validate the INIT-ACK chunk in the cookie (my info) the
2072          * INIT-ACK follows the INIT chunk
2073          */
2074         initack_cp = (struct sctp_init_ack_chunk *)
2075             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2076             (uint8_t *) & initack_buf);
2077         if (initack_cp == NULL) {
2078                 /* could not pull INIT-ACK chunk in cookie */
2079                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2080                 return (NULL);
2081         }
2082         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2083                 return (NULL);
2084         }
2085         /*
2086          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2087          * "initack_limit" value.  This is because the chk_length field
2088          * includes the length of the cookie, but the cookie is omitted when
2089          * the INIT and INIT_ACK are tacked onto the cookie...
2090          */
2091         initack_limit = offset + cookie_len;
2092
2093         /*
2094          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2095          * and popluate
2096          */
2097
2098         /*
2099          * Here we do a trick, we set in NULL for the proc/thread argument.
2100          * We do this since in effect we only use the p argument when the
2101          * socket is unbound and we must do an implicit bind. Since we are
2102          * getting a cookie, we cannot be unbound.
2103          */
2104         stcb = sctp_aloc_assoc(inp, init_src, &error,
2105             ntohl(initack_cp->init.initiate_tag), vrf_id,
2106             (struct thread *)NULL
2107             );
2108         if (stcb == NULL) {
2109                 struct mbuf *op_err;
2110
2111                 /* memory problem? */
2112                 SCTPDBG(SCTP_DEBUG_INPUT1,
2113                     "process_cookie_new: no room for another TCB!\n");
2114                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2115                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2116                     src, dst, sh, op_err,
2117                     mflowtype, mflowid,
2118                     vrf_id, port);
2119                 return (NULL);
2120         }
2121         /* get the correct sctp_nets */
2122         if (netp)
2123                 *netp = sctp_findnet(stcb, init_src);
2124
2125         asoc = &stcb->asoc;
2126         /* get scope variables out of cookie */
2127         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2128         asoc->scope.site_scope = cookie->site_scope;
2129         asoc->scope.local_scope = cookie->local_scope;
2130         asoc->scope.loopback_scope = cookie->loopback_scope;
2131
2132         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2133             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2134                 struct mbuf *op_err;
2135
2136                 /*
2137                  * Houston we have a problem. The EP changed while the
2138                  * cookie was in flight. Only recourse is to abort the
2139                  * association.
2140                  */
2141                 atomic_add_int(&stcb->asoc.refcnt, 1);
2142                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2143                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2144                     src, dst, sh, op_err,
2145                     mflowtype, mflowid,
2146                     vrf_id, port);
2147 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2148                 SCTP_TCB_UNLOCK(stcb);
2149                 SCTP_SOCKET_LOCK(so, 1);
2150                 SCTP_TCB_LOCK(stcb);
2151 #endif
2152                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2153                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2154 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2155                 SCTP_SOCKET_UNLOCK(so, 1);
2156 #endif
2157                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2158                 return (NULL);
2159         }
2160         /* process the INIT-ACK info (my info) */
2161         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2162         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2163         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2164         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2165         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2166         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2167         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2168         asoc->str_reset_seq_in = asoc->init_seq_number;
2169
2170         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2171
2172         /* process the INIT info (peer's info) */
2173         if (netp)
2174                 retval = sctp_process_init(init_cp, stcb);
2175         else
2176                 retval = 0;
2177         if (retval < 0) {
2178                 atomic_add_int(&stcb->asoc.refcnt, 1);
2179 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2180                 SCTP_TCB_UNLOCK(stcb);
2181                 SCTP_SOCKET_LOCK(so, 1);
2182                 SCTP_TCB_LOCK(stcb);
2183 #endif
2184                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2185                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2186 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2187                 SCTP_SOCKET_UNLOCK(so, 1);
2188 #endif
2189                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2190                 return (NULL);
2191         }
2192         /* load all addresses */
2193         if (sctp_load_addresses_from_init(stcb, m,
2194             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2195             src, dst, init_src)) {
2196                 atomic_add_int(&stcb->asoc.refcnt, 1);
2197 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2198                 SCTP_TCB_UNLOCK(stcb);
2199                 SCTP_SOCKET_LOCK(so, 1);
2200                 SCTP_TCB_LOCK(stcb);
2201 #endif
2202                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2203                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2204 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2205                 SCTP_SOCKET_UNLOCK(so, 1);
2206 #endif
2207                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2208                 return (NULL);
2209         }
2210         /*
2211          * verify any preceding AUTH chunk that was skipped
2212          */
2213         /* pull the local authentication parameters from the cookie/init-ack */
2214         sctp_auth_get_cookie_params(stcb, m,
2215             initack_offset + sizeof(struct sctp_init_ack_chunk),
2216             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2217         if (auth_skipped) {
2218                 struct sctp_auth_chunk *auth;
2219
2220                 auth = (struct sctp_auth_chunk *)
2221                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2222                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2223                         /* auth HMAC failed, dump the assoc and packet */
2224                         SCTPDBG(SCTP_DEBUG_AUTH1,
2225                             "COOKIE-ECHO: AUTH failed\n");
2226                         atomic_add_int(&stcb->asoc.refcnt, 1);
2227 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2228                         SCTP_TCB_UNLOCK(stcb);
2229                         SCTP_SOCKET_LOCK(so, 1);
2230                         SCTP_TCB_LOCK(stcb);
2231 #endif
2232                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2233                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2234 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2235                         SCTP_SOCKET_UNLOCK(so, 1);
2236 #endif
2237                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2238                         return (NULL);
2239                 } else {
2240                         /* remaining chunks checked... good to go */
2241                         stcb->asoc.authenticated = 1;
2242                 }
2243         }
2244         /* update current state */
2245         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2246         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2247         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2248                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2249                     stcb->sctp_ep, stcb, asoc->primary_destination);
2250         }
2251         sctp_stop_all_cookie_timers(stcb);
2252         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2253         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2254
2255         /*
2256          * if we're doing ASCONFs, check to see if we have any new local
2257          * addresses that need to get added to the peer (eg. addresses
2258          * changed while cookie echo in flight).  This needs to be done
2259          * after we go to the OPEN state to do the correct asconf
2260          * processing. else, make sure we have the correct addresses in our
2261          * lists
2262          */
2263
2264         /* warning, we re-use sin, sin6, sa_store here! */
2265         /* pull in local_address (our "from" address) */
2266         switch (cookie->laddr_type) {
2267 #ifdef INET
2268         case SCTP_IPV4_ADDRESS:
2269                 /* source addr is IPv4 */
2270                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2271                 store.sin.sin_family = AF_INET;
2272                 store.sin.sin_len = sizeof(struct sockaddr_in);
2273                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2274                 break;
2275 #endif
2276 #ifdef INET6
2277         case SCTP_IPV6_ADDRESS:
2278                 /* source addr is IPv6 */
2279                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2280                 store.sin6.sin6_family = AF_INET6;
2281                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2282                 store.sin6.sin6_scope_id = cookie->scope_id;
2283                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2284                 break;
2285 #endif
2286         default:
2287                 atomic_add_int(&stcb->asoc.refcnt, 1);
2288 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2289                 SCTP_TCB_UNLOCK(stcb);
2290                 SCTP_SOCKET_LOCK(so, 1);
2291                 SCTP_TCB_LOCK(stcb);
2292 #endif
2293                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2294                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2295 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2296                 SCTP_SOCKET_UNLOCK(so, 1);
2297 #endif
2298                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2299                 return (NULL);
2300         }
2301
2302         /* set up to notify upper layer */
2303         *notification = SCTP_NOTIFY_ASSOC_UP;
2304         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2305             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2306             (inp->sctp_socket->so_qlimit == 0)) {
2307                 /*
2308                  * This is an endpoint that called connect() how it got a
2309                  * cookie that is NEW is a bit of a mystery. It must be that
2310                  * the INIT was sent, but before it got there.. a complete
2311                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2312                  * should have went to the other code.. not here.. oh well..
2313                  * a bit of protection is worth having..
2314                  */
2315                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2316 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2317                 atomic_add_int(&stcb->asoc.refcnt, 1);
2318                 SCTP_TCB_UNLOCK(stcb);
2319                 SCTP_SOCKET_LOCK(so, 1);
2320                 SCTP_TCB_LOCK(stcb);
2321                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2322                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2323                         SCTP_SOCKET_UNLOCK(so, 1);
2324                         return (NULL);
2325                 }
2326 #endif
2327                 soisconnected(stcb->sctp_socket);
2328 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2329                 SCTP_SOCKET_UNLOCK(so, 1);
2330 #endif
2331         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2332             (inp->sctp_socket->so_qlimit)) {
2333                 /*
2334                  * We don't want to do anything with this one. Since it is
2335                  * the listening guy. The timer will get started for
2336                  * accepted connections in the caller.
2337                  */
2338                 ;
2339         }
2340         /* since we did not send a HB make sure we don't double things */
2341         if ((netp) && (*netp))
2342                 (*netp)->hb_responded = 1;
2343
2344         if (stcb->asoc.sctp_autoclose_ticks &&
2345             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2346                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2347         }
2348         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2349         if ((netp) && (*netp)) {
2350                 /* calculate the RTT and set the encaps port */
2351                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2352                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2353                     SCTP_RTT_FROM_NON_DATA);
2354                 (*netp)->port = port;
2355         }
2356         /* respond with a COOKIE-ACK */
2357         sctp_send_cookie_ack(stcb);
2358
2359         /*
2360          * check the address lists for any ASCONFs that need to be sent
2361          * AFTER the cookie-ack is sent
2362          */
2363         sctp_check_address_list(stcb, m,
2364             initack_offset + sizeof(struct sctp_init_ack_chunk),
2365             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2366             &store.sa, cookie->local_scope, cookie->site_scope,
2367             cookie->ipv4_scope, cookie->loopback_scope);
2368
2369
2370         return (stcb);
2371 }
2372
2373 /*
2374  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2375  * we NEED to make sure we are not already using the vtag. If so we
2376  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2377         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2378                                                             SCTP_BASE_INFO(hashasocmark))];
2379         LIST_FOREACH(stcb, head, sctp_asocs) {
2380                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2381                        -- SEND ABORT - TRY AGAIN --
2382                 }
2383         }
2384 */
2385
2386 /*
2387  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2388  * existing (non-NULL) TCB
2389  */
2390 static struct mbuf *
2391 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2392     struct sockaddr *src, struct sockaddr *dst,
2393     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2394     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2395     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2396     struct sctp_tcb **locked_tcb,
2397     uint8_t mflowtype, uint32_t mflowid,
2398     uint32_t vrf_id, uint16_t port)
2399 {
2400         struct sctp_state_cookie *cookie;
2401         struct sctp_tcb *l_stcb = *stcb;
2402         struct sctp_inpcb *l_inp;
2403         struct sockaddr *to;
2404         struct sctp_pcb *ep;
2405         struct mbuf *m_sig;
2406         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2407         uint8_t *sig;
2408         uint8_t cookie_ok = 0;
2409         unsigned int sig_offset, cookie_offset;
2410         unsigned int cookie_len;
2411         struct timeval now;
2412         struct timeval time_expires;
2413         int notification = 0;
2414         struct sctp_nets *netl;
2415         int had_a_existing_tcb = 0;
2416         int send_int_conf = 0;
2417
2418 #ifdef INET
2419         struct sockaddr_in sin;
2420
2421 #endif
2422 #ifdef INET6
2423         struct sockaddr_in6 sin6;
2424
2425 #endif
2426
2427         SCTPDBG(SCTP_DEBUG_INPUT2,
2428             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2429
2430         if (inp_p == NULL) {
2431                 return (NULL);
2432         }
2433         cookie = &cp->cookie;
2434         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2435         cookie_len = ntohs(cp->ch.chunk_length);
2436
2437         if ((cookie->peerport != sh->src_port) &&
2438             (cookie->myport != sh->dest_port) &&
2439             (cookie->my_vtag != sh->v_tag)) {
2440                 /*
2441                  * invalid ports or bad tag.  Note that we always leave the
2442                  * v_tag in the header in network order and when we stored
2443                  * it in the my_vtag slot we also left it in network order.
2444                  * This maintains the match even though it may be in the
2445                  * opposite byte order of the machine :->
2446                  */
2447                 return (NULL);
2448         }
2449         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2450             sizeof(struct sctp_init_chunk) +
2451             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2452                 /* cookie too small */
2453                 return (NULL);
2454         }
2455         /*
2456          * split off the signature into its own mbuf (since it should not be
2457          * calculated in the sctp_hmac_m() call).
2458          */
2459         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2460         m_sig = m_split(m, sig_offset, M_NOWAIT);
2461         if (m_sig == NULL) {
2462                 /* out of memory or ?? */
2463                 return (NULL);
2464         }
2465 #ifdef SCTP_MBUF_LOGGING
2466         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2467                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2468         }
2469 #endif
2470
2471         /*
2472          * compute the signature/digest for the cookie
2473          */
2474         ep = &(*inp_p)->sctp_ep;
2475         l_inp = *inp_p;
2476         if (l_stcb) {
2477                 SCTP_TCB_UNLOCK(l_stcb);
2478         }
2479         SCTP_INP_RLOCK(l_inp);
2480         if (l_stcb) {
2481                 SCTP_TCB_LOCK(l_stcb);
2482         }
2483         /* which cookie is it? */
2484         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2485             (ep->current_secret_number != ep->last_secret_number)) {
2486                 /* it's the old cookie */
2487                 (void)sctp_hmac_m(SCTP_HMAC,
2488                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2489                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2490         } else {
2491                 /* it's the current cookie */
2492                 (void)sctp_hmac_m(SCTP_HMAC,
2493                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2494                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2495         }
2496         /* get the signature */
2497         SCTP_INP_RUNLOCK(l_inp);
2498         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2499         if (sig == NULL) {
2500                 /* couldn't find signature */
2501                 sctp_m_freem(m_sig);
2502                 return (NULL);
2503         }
2504         /* compare the received digest with the computed digest */
2505         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2506                 /* try the old cookie? */
2507                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2508                     (ep->current_secret_number != ep->last_secret_number)) {
2509                         /* compute digest with old */
2510                         (void)sctp_hmac_m(SCTP_HMAC,
2511                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2512                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2513                         /* compare */
2514                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2515                                 cookie_ok = 1;
2516                 }
2517         } else {
2518                 cookie_ok = 1;
2519         }
2520
2521         /*
2522          * Now before we continue we must reconstruct our mbuf so that
2523          * normal processing of any other chunks will work.
2524          */
2525         {
2526                 struct mbuf *m_at;
2527
2528                 m_at = m;
2529                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2530                         m_at = SCTP_BUF_NEXT(m_at);
2531                 }
2532                 SCTP_BUF_NEXT(m_at) = m_sig;
2533         }
2534
2535         if (cookie_ok == 0) {
2536                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2537                 SCTPDBG(SCTP_DEBUG_INPUT2,
2538                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2539                     (uint32_t) offset, cookie_offset, sig_offset);
2540                 return (NULL);
2541         }
2542         /*
2543          * check the cookie timestamps to be sure it's not stale
2544          */
2545         (void)SCTP_GETTIME_TIMEVAL(&now);
2546         /* Expire time is in Ticks, so we convert to seconds */
2547         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2548         time_expires.tv_usec = cookie->time_entered.tv_usec;
2549         /*
2550          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2551          * is undefined.
2552          */
2553         if (timevalcmp(&now, &time_expires, >)) {
2554                 /* cookie is stale! */
2555                 struct mbuf *op_err;
2556                 struct sctp_stale_cookie_msg *scm;
2557                 uint32_t tim;
2558
2559                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2560                     0, M_NOWAIT, 1, MT_DATA);
2561                 if (op_err == NULL) {
2562                         /* FOOBAR */
2563                         return (NULL);
2564                 }
2565                 /* Set the len */
2566                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2567                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2568                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2569                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2570                     (sizeof(uint32_t))));
2571                 /* seconds to usec */
2572                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2573                 /* add in usec */
2574                 if (tim == 0)
2575                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2576                 scm->time_usec = htonl(tim);
2577                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2578                     mflowtype, mflowid, l_inp->fibnum,
2579                     vrf_id, port);
2580                 return (NULL);
2581         }
2582         /*
2583          * Now we must see with the lookup address if we have an existing
2584          * asoc. This will only happen if we were in the COOKIE-WAIT state
2585          * and a INIT collided with us and somewhere the peer sent the
2586          * cookie on another address besides the single address our assoc
2587          * had for him. In this case we will have one of the tie-tags set at
2588          * least AND the address field in the cookie can be used to look it
2589          * up.
2590          */
2591         to = NULL;
2592         switch (cookie->addr_type) {
2593 #ifdef INET6
2594         case SCTP_IPV6_ADDRESS:
2595                 memset(&sin6, 0, sizeof(sin6));
2596                 sin6.sin6_family = AF_INET6;
2597                 sin6.sin6_len = sizeof(sin6);
2598                 sin6.sin6_port = sh->src_port;
2599                 sin6.sin6_scope_id = cookie->scope_id;
2600                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2601                     sizeof(sin6.sin6_addr.s6_addr));
2602                 to = (struct sockaddr *)&sin6;
2603                 break;
2604 #endif
2605 #ifdef INET
2606         case SCTP_IPV4_ADDRESS:
2607                 memset(&sin, 0, sizeof(sin));
2608                 sin.sin_family = AF_INET;
2609                 sin.sin_len = sizeof(sin);
2610                 sin.sin_port = sh->src_port;
2611                 sin.sin_addr.s_addr = cookie->address[0];
2612                 to = (struct sockaddr *)&sin;
2613                 break;
2614 #endif
2615         default:
2616                 /* This should not happen */
2617                 return (NULL);
2618         }
2619         if (*stcb == NULL) {
2620                 /* Yep, lets check */
2621                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2622                 if (*stcb == NULL) {
2623                         /*
2624                          * We should have only got back the same inp. If we
2625                          * got back a different ep we have a problem. The
2626                          * original findep got back l_inp and now
2627                          */
2628                         if (l_inp != *inp_p) {
2629                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2630                         }
2631                 } else {
2632                         if (*locked_tcb == NULL) {
2633                                 /*
2634                                  * In this case we found the assoc only
2635                                  * after we locked the create lock. This
2636                                  * means we are in a colliding case and we
2637                                  * must make sure that we unlock the tcb if
2638                                  * its one of the cases where we throw away
2639                                  * the incoming packets.
2640                                  */
2641                                 *locked_tcb = *stcb;
2642
2643                                 /*
2644                                  * We must also increment the inp ref count
2645                                  * since the ref_count flags was set when we
2646                                  * did not find the TCB, now we found it
2647                                  * which reduces the refcount.. we must
2648                                  * raise it back out to balance it all :-)
2649                                  */
2650                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2651                                 if ((*stcb)->sctp_ep != l_inp) {
2652                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2653                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2654                                 }
2655                         }
2656                 }
2657         }
2658         cookie_len -= SCTP_SIGNATURE_SIZE;
2659         if (*stcb == NULL) {
2660                 /* this is the "normal" case... get a new TCB */
2661                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2662                     cookie, cookie_len, *inp_p,
2663                     netp, to, &notification,
2664                     auth_skipped, auth_offset, auth_len,
2665                     mflowtype, mflowid,
2666                     vrf_id, port);
2667         } else {
2668                 /* this is abnormal... cookie-echo on existing TCB */
2669                 had_a_existing_tcb = 1;
2670                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2671                     src, dst, sh,
2672                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2673                     &notification, auth_skipped, auth_offset, auth_len,
2674                     mflowtype, mflowid,
2675                     vrf_id, port);
2676         }
2677
2678         if (*stcb == NULL) {
2679                 /* still no TCB... must be bad cookie-echo */
2680                 return (NULL);
2681         }
2682         if (*netp != NULL) {
2683                 (*netp)->flowtype = mflowtype;
2684                 (*netp)->flowid = mflowid;
2685         }
2686         /*
2687          * Ok, we built an association so confirm the address we sent the
2688          * INIT-ACK to.
2689          */
2690         netl = sctp_findnet(*stcb, to);
2691         /*
2692          * This code should in theory NOT run but
2693          */
2694         if (netl == NULL) {
2695                 /* TSNH! Huh, why do I need to add this address here? */
2696                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2697                         return (NULL);
2698                 }
2699                 netl = sctp_findnet(*stcb, to);
2700         }
2701         if (netl) {
2702                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2703                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2704                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2705                             netl);
2706                         send_int_conf = 1;
2707                 }
2708         }
2709         sctp_start_net_timers(*stcb);
2710         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2711                 if (!had_a_existing_tcb ||
2712                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2713                         /*
2714                          * If we have a NEW cookie or the connect never
2715                          * reached the connected state during collision we
2716                          * must do the TCP accept thing.
2717                          */
2718                         struct socket *so, *oso;
2719                         struct sctp_inpcb *inp;
2720
2721                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2722                                 /*
2723                                  * For a restart we will keep the same
2724                                  * socket, no need to do anything. I THINK!!
2725                                  */
2726                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2727                                 if (send_int_conf) {
2728                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2729                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2730                                 }
2731                                 return (m);
2732                         }
2733                         oso = (*inp_p)->sctp_socket;
2734                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2735                         SCTP_TCB_UNLOCK((*stcb));
2736                         CURVNET_SET(oso->so_vnet);
2737                         so = sonewconn(oso, 0
2738                             );
2739                         CURVNET_RESTORE();
2740                         SCTP_TCB_LOCK((*stcb));
2741                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2742
2743                         if (so == NULL) {
2744                                 struct mbuf *op_err;
2745
2746 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2747                                 struct socket *pcb_so;
2748
2749 #endif
2750                                 /* Too many sockets */
2751                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2752                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2753                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2754                                     src, dst, sh, op_err,
2755                                     mflowtype, mflowid,
2756                                     vrf_id, port);
2757 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2758                                 pcb_so = SCTP_INP_SO(*inp_p);
2759                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2760                                 SCTP_TCB_UNLOCK((*stcb));
2761                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2762                                 SCTP_TCB_LOCK((*stcb));
2763                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2764 #endif
2765                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2766                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2767 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2768                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2769 #endif
2770                                 return (NULL);
2771                         }
2772                         inp = (struct sctp_inpcb *)so->so_pcb;
2773                         SCTP_INP_INCR_REF(inp);
2774                         /*
2775                          * We add the unbound flag here so that if we get an
2776                          * soabort() before we get the move_pcb done, we
2777                          * will properly cleanup.
2778                          */
2779                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2780                             SCTP_PCB_FLAGS_CONNECTED |
2781                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2782                             SCTP_PCB_FLAGS_UNBOUND |
2783                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2784                             SCTP_PCB_FLAGS_DONT_WAKE);
2785                         inp->sctp_features = (*inp_p)->sctp_features;
2786                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2787                         inp->sctp_socket = so;
2788                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2789                         inp->max_cwnd = (*inp_p)->max_cwnd;
2790                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2791                         inp->ecn_supported = (*inp_p)->ecn_supported;
2792                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2793                         inp->auth_supported = (*inp_p)->auth_supported;
2794                         inp->asconf_supported = (*inp_p)->asconf_supported;
2795                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2796                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2797                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2798                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2799                         inp->sctp_context = (*inp_p)->sctp_context;
2800                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2801                         inp->fibnum = (*inp_p)->fibnum;
2802                         inp->inp_starting_point_for_iterator = NULL;
2803                         /*
2804                          * copy in the authentication parameters from the
2805                          * original endpoint
2806                          */
2807                         if (inp->sctp_ep.local_hmacs)
2808                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2809                         inp->sctp_ep.local_hmacs =
2810                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2811                         if (inp->sctp_ep.local_auth_chunks)
2812                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2813                         inp->sctp_ep.local_auth_chunks =
2814                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2815
2816                         /*
2817                          * Now we must move it from one hash table to
2818                          * another and get the tcb in the right place.
2819                          */
2820
2821                         /*
2822                          * This is where the one-2-one socket is put into
2823                          * the accept state waiting for the accept!
2824                          */
2825                         if (*stcb) {
2826                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2827                         }
2828                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2829
2830                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2831                         SCTP_TCB_UNLOCK((*stcb));
2832
2833                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2834                             0);
2835                         SCTP_TCB_LOCK((*stcb));
2836                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2837
2838
2839                         /*
2840                          * now we must check to see if we were aborted while
2841                          * the move was going on and the lock/unlock
2842                          * happened.
2843                          */
2844                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2845                                 /*
2846                                  * yep it was, we leave the assoc attached
2847                                  * to the socket since the sctp_inpcb_free()
2848                                  * call will send an abort for us.
2849                                  */
2850                                 SCTP_INP_DECR_REF(inp);
2851                                 return (NULL);
2852                         }
2853                         SCTP_INP_DECR_REF(inp);
2854                         /* Switch over to the new guy */
2855                         *inp_p = inp;
2856                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2857                         if (send_int_conf) {
2858                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2859                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2860                         }
2861                         /*
2862                          * Pull it from the incomplete queue and wake the
2863                          * guy
2864                          */
2865 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2866                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2867                         SCTP_TCB_UNLOCK((*stcb));
2868                         SCTP_SOCKET_LOCK(so, 1);
2869 #endif
2870                         soisconnected(so);
2871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2872                         SCTP_TCB_LOCK((*stcb));
2873                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2874                         SCTP_SOCKET_UNLOCK(so, 1);
2875 #endif
2876                         return (m);
2877                 }
2878         }
2879         if (notification) {
2880                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2881         }
2882         if (send_int_conf) {
2883                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2884                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2885         }
2886         return (m);
2887 }
2888
2889 static void
2890 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2891     struct sctp_tcb *stcb, struct sctp_nets *net)
2892 {
2893         /* cp must not be used, others call this without a c-ack :-) */
2894         struct sctp_association *asoc;
2895
2896         SCTPDBG(SCTP_DEBUG_INPUT2,
2897             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2898         if ((stcb == NULL) || (net == NULL)) {
2899                 return;
2900         }
2901         asoc = &stcb->asoc;
2902
2903         sctp_stop_all_cookie_timers(stcb);
2904         /* process according to association state */
2905         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2906                 /* state change only needed when I am in right state */
2907                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2908                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2909                 sctp_start_net_timers(stcb);
2910                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2911                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2912                             stcb->sctp_ep, stcb, asoc->primary_destination);
2913
2914                 }
2915                 /* update RTO */
2916                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2917                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2918                 if (asoc->overall_error_count == 0) {
2919                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2920                             &asoc->time_entered, sctp_align_safe_nocopy,
2921                             SCTP_RTT_FROM_NON_DATA);
2922                 }
2923                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2924                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2925                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2926                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2927 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2928                         struct socket *so;
2929
2930 #endif
2931                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2932 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2933                         so = SCTP_INP_SO(stcb->sctp_ep);
2934                         atomic_add_int(&stcb->asoc.refcnt, 1);
2935                         SCTP_TCB_UNLOCK(stcb);
2936                         SCTP_SOCKET_LOCK(so, 1);
2937                         SCTP_TCB_LOCK(stcb);
2938                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2939 #endif
2940                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2941                                 soisconnected(stcb->sctp_socket);
2942                         }
2943 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2944                         SCTP_SOCKET_UNLOCK(so, 1);
2945 #endif
2946                 }
2947                 /*
2948                  * since we did not send a HB make sure we don't double
2949                  * things
2950                  */
2951                 net->hb_responded = 1;
2952
2953                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2954                         /*
2955                          * We don't need to do the asconf thing, nor hb or
2956                          * autoclose if the socket is closed.
2957                          */
2958                         goto closed_socket;
2959                 }
2960                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2961                     stcb, net);
2962
2963
2964                 if (stcb->asoc.sctp_autoclose_ticks &&
2965                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2966                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2967                             stcb->sctp_ep, stcb, NULL);
2968                 }
2969                 /*
2970                  * send ASCONF if parameters are pending and ASCONFs are
2971                  * allowed (eg. addresses changed when init/cookie echo were
2972                  * in flight)
2973                  */
2974                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2975                     (stcb->asoc.asconf_supported == 1) &&
2976                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2977 #ifdef SCTP_TIMER_BASED_ASCONF
2978                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2979                             stcb->sctp_ep, stcb,
2980                             stcb->asoc.primary_destination);
2981 #else
2982                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2983                             SCTP_ADDR_NOT_LOCKED);
2984 #endif
2985                 }
2986         }
2987 closed_socket:
2988         /* Toss the cookie if I can */
2989         sctp_toss_old_cookies(stcb, asoc);
2990         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2991                 /* Restart the timer if we have pending data */
2992                 struct sctp_tmit_chunk *chk;
2993
2994                 chk = TAILQ_FIRST(&asoc->sent_queue);
2995                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2996         }
2997 }
2998
2999 static void
3000 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3001     struct sctp_tcb *stcb)
3002 {
3003         struct sctp_nets *net;
3004         struct sctp_tmit_chunk *lchk;
3005         struct sctp_ecne_chunk bkup;
3006         uint8_t override_bit;
3007         uint32_t tsn, window_data_tsn;
3008         int len;
3009         unsigned int pkt_cnt;
3010
3011         len = ntohs(cp->ch.chunk_length);
3012         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3013             (len != sizeof(struct old_sctp_ecne_chunk))) {
3014                 return;
3015         }
3016         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3017                 /* Its the old format */
3018                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3019                 bkup.num_pkts_since_cwr = htonl(1);
3020                 cp = &bkup;
3021         }
3022         SCTP_STAT_INCR(sctps_recvecne);
3023         tsn = ntohl(cp->tsn);
3024         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3025         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3026         if (lchk == NULL) {
3027                 window_data_tsn = stcb->asoc.sending_seq - 1;
3028         } else {
3029                 window_data_tsn = lchk->rec.data.TSN_seq;
3030         }
3031
3032         /* Find where it was sent to if possible. */
3033         net = NULL;
3034         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3035                 if (lchk->rec.data.TSN_seq == tsn) {
3036                         net = lchk->whoTo;
3037                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3038                         break;
3039                 }
3040                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3041                         break;
3042                 }
3043         }
3044         if (net == NULL) {
3045                 /*
3046                  * What to do. A previous send of a CWR was possibly lost.
3047                  * See how old it is, we may have it marked on the actual
3048                  * net.
3049                  */
3050                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3051                         if (tsn == net->last_cwr_tsn) {
3052                                 /* Found him, send it off */
3053                                 break;
3054                         }
3055                 }
3056                 if (net == NULL) {
3057                         /*
3058                          * If we reach here, we need to send a special CWR
3059                          * that says hey, we did this a long time ago and
3060                          * you lost the response.
3061                          */
3062                         net = TAILQ_FIRST(&stcb->asoc.nets);
3063                         if (net == NULL) {
3064                                 /* TSNH */
3065                                 return;
3066                         }
3067                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3068                 } else {
3069                         override_bit = 0;
3070                 }
3071         } else {
3072                 override_bit = 0;
3073         }
3074         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3075             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3076                 /*
3077                  * JRS - Use the congestion control given in the pluggable
3078                  * CC module
3079                  */
3080                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3081                 /*
3082                  * We reduce once every RTT. So we will only lower cwnd at
3083                  * the next sending seq i.e. the window_data_tsn
3084                  */
3085                 net->cwr_window_tsn = window_data_tsn;
3086                 net->ecn_ce_pkt_cnt += pkt_cnt;
3087                 net->lost_cnt = pkt_cnt;
3088                 net->last_cwr_tsn = tsn;
3089         } else {
3090                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3091                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3092                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3093                         /*
3094                          * Another loss in the same window update how many
3095                          * marks/packets lost we have had.
3096                          */
3097                         int cnt = 1;
3098
3099                         if (pkt_cnt > net->lost_cnt) {
3100                                 /* Should be the case */
3101                                 cnt = (pkt_cnt - net->lost_cnt);
3102                                 net->ecn_ce_pkt_cnt += cnt;
3103                         }
3104                         net->lost_cnt = pkt_cnt;
3105                         net->last_cwr_tsn = tsn;
3106                         /*
3107                          * Most CC functions will ignore this call, since we
3108                          * are in-window yet of the initial CE the peer saw.
3109                          */
3110                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3111                 }
3112         }
3113         /*
3114          * We always send a CWR this way if our previous one was lost our
3115          * peer will get an update, or if it is not time again to reduce we
3116          * still get the cwr to the peer. Note we set the override when we
3117          * could not find the TSN on the chunk or the destination network.
3118          */
3119         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3120 }
3121
3122 static void
3123 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3124 {
3125         /*
3126          * Here we get a CWR from the peer. We must look in the outqueue and
3127          * make sure that we have a covered ECNE in the control chunk part.
3128          * If so remove it.
3129          */
3130         struct sctp_tmit_chunk *chk;
3131         struct sctp_ecne_chunk *ecne;
3132         int override;
3133         uint32_t cwr_tsn;
3134
3135         cwr_tsn = ntohl(cp->tsn);
3136         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3137         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3138                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3139                         continue;
3140                 }
3141                 if ((override == 0) && (chk->whoTo != net)) {
3142                         /* Must be from the right src unless override is set */
3143                         continue;
3144                 }
3145                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3146                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3147                         /* this covers this ECNE, we can remove it */
3148                         stcb->asoc.ecn_echo_cnt_onq--;
3149                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3150                             sctp_next);
3151                         sctp_m_freem(chk->data);
3152                         chk->data = NULL;
3153                         stcb->asoc.ctrl_queue_cnt--;
3154                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3155                         if (override == 0) {
3156                                 break;
3157                         }
3158                 }
3159         }
3160 }
3161
3162 static void
3163 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3164     struct sctp_tcb *stcb, struct sctp_nets *net)
3165 {
3166         struct sctp_association *asoc;
3167
3168 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3169         struct socket *so;
3170
3171 #endif
3172
3173         SCTPDBG(SCTP_DEBUG_INPUT2,
3174             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3175         if (stcb == NULL)
3176                 return;
3177
3178         asoc = &stcb->asoc;
3179         /* process according to association state */
3180         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3181                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3182                 SCTPDBG(SCTP_DEBUG_INPUT2,
3183                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3184                 SCTP_TCB_UNLOCK(stcb);
3185                 return;
3186         }
3187         /* notify upper layer protocol */
3188         if (stcb->sctp_socket) {
3189                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3190         }
3191 #ifdef INVARIANTS
3192         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3193             !TAILQ_EMPTY(&asoc->sent_queue) ||
3194             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3195                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3196         }
3197 #endif
3198         /* stop the timer */
3199         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3200             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3201         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3202         /* free the TCB */
3203         SCTPDBG(SCTP_DEBUG_INPUT2,
3204             "sctp_handle_shutdown_complete: calls free-asoc\n");
3205 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3206         so = SCTP_INP_SO(stcb->sctp_ep);
3207         atomic_add_int(&stcb->asoc.refcnt, 1);
3208         SCTP_TCB_UNLOCK(stcb);
3209         SCTP_SOCKET_LOCK(so, 1);
3210         SCTP_TCB_LOCK(stcb);
3211         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3212 #endif
3213         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3214             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3215 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3216         SCTP_SOCKET_UNLOCK(so, 1);
3217 #endif
3218         return;
3219 }
3220
3221 static int
3222 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3223     struct sctp_nets *net, uint8_t flg)
3224 {
3225         switch (desc->chunk_type) {
3226         case SCTP_DATA:
3227                 /* find the tsn to resend (possibly */
3228                 {
3229                         uint32_t tsn;
3230                         struct sctp_tmit_chunk *tp1;
3231
3232                         tsn = ntohl(desc->tsn_ifany);
3233                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3234                                 if (tp1->rec.data.TSN_seq == tsn) {
3235                                         /* found it */
3236                                         break;
3237                                 }
3238                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3239                                         /* not found */
3240                                         tp1 = NULL;
3241                                         break;
3242                                 }
3243                         }
3244                         if (tp1 == NULL) {
3245                                 /*
3246                                  * Do it the other way , aka without paying
3247                                  * attention to queue seq order.
3248                                  */
3249                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3250                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3251                                         if (tp1->rec.data.TSN_seq == tsn) {
3252                                                 /* found it */
3253                                                 break;
3254                                         }
3255                                 }
3256                         }
3257                         if (tp1 == NULL) {
3258                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3259                         }
3260                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3261                                 uint8_t *ddp;
3262
3263                                 if (((flg & SCTP_BADCRC) == 0) &&
3264                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3265                                         return (0);
3266                                 }
3267                                 if ((stcb->asoc.peers_rwnd == 0) &&
3268                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3269                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3270                                         return (0);
3271                                 }
3272                                 if (stcb->asoc.peers_rwnd == 0 &&
3273                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3274                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3275                                         return (0);
3276                                 }
3277                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3278                                     sizeof(struct sctp_data_chunk));
3279                                 {
3280                                         unsigned int iii;
3281
3282                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3283                                             iii++) {
3284                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3285                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3286                                                         return (-1);
3287                                                 }
3288                                         }
3289                                 }
3290
3291                                 if (tp1->do_rtt) {
3292                                         /*
3293                                          * this guy had a RTO calculation
3294                                          * pending on it, cancel it
3295                                          */
3296                                         if (tp1->whoTo->rto_needed == 0) {
3297                                                 tp1->whoTo->rto_needed = 1;
3298                                         }
3299                                         tp1->do_rtt = 0;
3300                                 }
3301                                 SCTP_STAT_INCR(sctps_pdrpmark);
3302                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3303                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3304                                 /*
3305                                  * mark it as if we were doing a FR, since
3306                                  * we will be getting gap ack reports behind
3307                                  * the info from the router.
3308                                  */
3309                                 tp1->rec.data.doing_fast_retransmit = 1;
3310                                 /*
3311                                  * mark the tsn with what sequences can
3312                                  * cause a new FR.
3313                                  */
3314                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3315                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3316                                 } else {
3317                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3318                                 }
3319
3320                                 /* restart the timer */
3321                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3322                                     stcb, tp1->whoTo,
3323                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3324                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3325                                     stcb, tp1->whoTo);
3326
3327                                 /* fix counts and things */
3328                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3329                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3330                                             tp1->whoTo->flight_size,
3331                                             tp1->book_size,
3332                                             (uintptr_t) stcb,
3333                                             tp1->rec.data.TSN_seq);
3334                                 }
3335                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3336                                         sctp_flight_size_decrease(tp1);
3337                                         sctp_total_flight_decrease(stcb, tp1);
3338                                 }
3339                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3340                         } {
3341                                 /* audit code */
3342                                 unsigned int audit;
3343
3344                                 audit = 0;
3345                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3346                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3347                                                 audit++;
3348                                 }
3349                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3350                                     sctp_next) {
3351                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3352                                                 audit++;
3353                                 }
3354                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3355                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3356                                             audit, stcb->asoc.sent_queue_retran_cnt);
3357 #ifndef SCTP_AUDITING_ENABLED
3358                                         stcb->asoc.sent_queue_retran_cnt = audit;
3359 #endif
3360                                 }
3361                         }
3362                 }
3363                 break;
3364         case SCTP_ASCONF:
3365                 {
3366                         struct sctp_tmit_chunk *asconf;
3367
3368                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3369                             sctp_next) {
3370                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3371                                         break;
3372                                 }
3373                         }
3374                         if (asconf) {
3375                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3376                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3377                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3378                                 asconf->snd_count--;
3379                         }
3380                 }
3381                 break;
3382         case SCTP_INITIATION:
3383                 /* resend the INIT */
3384                 stcb->asoc.dropped_special_cnt++;
3385                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3386                         /*
3387                          * If we can get it in, in a few attempts we do
3388                          * this, otherwise we let the timer fire.
3389                          */
3390                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3391                             stcb, net,
3392                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3393                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3394                 }
3395                 break;
3396         case SCTP_SELECTIVE_ACK:
3397         case SCTP_NR_SELECTIVE_ACK:
3398                 /* resend the sack */
3399                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3400                 break;
3401         case SCTP_HEARTBEAT_REQUEST:
3402                 /* resend a demand HB */
3403                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3404                         /*
3405                          * Only retransmit if we KNOW we wont destroy the
3406                          * tcb
3407                          */
3408                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3409                 }
3410                 break;
3411         case SCTP_SHUTDOWN:
3412                 sctp_send_shutdown(stcb, net);
3413                 break;
3414         case SCTP_SHUTDOWN_ACK:
3415                 sctp_send_shutdown_ack(stcb, net);
3416                 break;
3417         case SCTP_COOKIE_ECHO:
3418                 {
3419                         struct sctp_tmit_chunk *cookie;
3420
3421                         cookie = NULL;
3422                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3423                             sctp_next) {
3424                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3425                                         break;
3426                                 }
3427                         }
3428                         if (cookie) {
3429                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3430                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3431                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3432                                 sctp_stop_all_cookie_timers(stcb);
3433                         }
3434                 }
3435                 break;
3436         case SCTP_COOKIE_ACK:
3437                 sctp_send_cookie_ack(stcb);
3438                 break;
3439         case SCTP_ASCONF_ACK:
3440                 /* resend last asconf ack */
3441                 sctp_send_asconf_ack(stcb);
3442                 break;
3443         case SCTP_FORWARD_CUM_TSN:
3444                 send_forward_tsn(stcb, &stcb->asoc);
3445                 break;
3446                 /* can't do anything with these */
3447         case SCTP_PACKET_DROPPED:
3448         case SCTP_INITIATION_ACK:       /* this should not happen */
3449         case SCTP_HEARTBEAT_ACK:
3450         case SCTP_ABORT_ASSOCIATION:
3451         case SCTP_OPERATION_ERROR:
3452         case SCTP_SHUTDOWN_COMPLETE:
3453         case SCTP_ECN_ECHO:
3454         case SCTP_ECN_CWR:
3455         default:
3456                 break;
3457         }
3458         return (0);
3459 }
3460
3461 void
3462 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3463 {
3464         uint32_t i;
3465         uint16_t temp;
3466
3467         /*
3468          * We set things to 0xffff since this is the last delivered sequence
3469          * and we will be sending in 0 after the reset.
3470          */
3471
3472         if (number_entries) {
3473                 for (i = 0; i < number_entries; i++) {
3474                         temp = ntohs(list[i]);
3475                         if (temp >= stcb->asoc.streamincnt) {
3476                                 continue;
3477                         }
3478                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3479                 }
3480         } else {
3481                 list = NULL;
3482                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3483                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3484                 }
3485         }
3486         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3487 }
3488
3489 static void
3490 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3491 {
3492         uint32_t i;
3493         uint16_t temp;
3494
3495         if (number_entries > 0) {
3496                 for (i = 0; i < number_entries; i++) {
3497                         temp = ntohs(list[i]);
3498                         if (temp >= stcb->asoc.streamoutcnt) {
3499                                 /* no such stream */
3500                                 continue;
3501                         }
3502                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3503                 }
3504         } else {
3505                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3506                         stcb->asoc.strmout[i].next_sequence_send = 0;
3507                 }
3508         }
3509         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3510 }
3511
3512 static void
3513 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3514 {
3515         uint32_t i;
3516         uint16_t temp;
3517
3518         if (number_entries > 0) {
3519                 for (i = 0; i < number_entries; i++) {
3520                         temp = ntohs(list[i]);
3521                         if (temp >= stcb->asoc.streamoutcnt) {
3522                                 /* no such stream */
3523                                 continue;
3524                         }
3525                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3526                 }
3527         } else {
3528                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3529                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3530                 }
3531         }
3532 }
3533
3534
3535 struct sctp_stream_reset_request *
3536 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3537 {
3538         struct sctp_association *asoc;
3539         struct sctp_chunkhdr *ch;
3540         struct sctp_stream_reset_request *r;
3541         struct sctp_tmit_chunk *chk;
3542         int len, clen;
3543
3544         asoc = &stcb->asoc;
3545         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3546                 asoc->stream_reset_outstanding = 0;
3547                 return (NULL);
3548         }
3549         if (stcb->asoc.str_reset == NULL) {
3550                 asoc->stream_reset_outstanding = 0;
3551                 return (NULL);
3552         }
3553         chk = stcb->asoc.str_reset;
3554         if (chk->data == NULL) {
3555                 return (NULL);
3556         }
3557         if (bchk) {
3558                 /* he wants a copy of the chk pointer */
3559                 *bchk = chk;
3560         }
3561         clen = chk->send_size;
3562         ch = mtod(chk->data, struct sctp_chunkhdr *);
3563         r = (struct sctp_stream_reset_request *)(ch + 1);
3564         if (ntohl(r->request_seq) == seq) {
3565                 /* found it */
3566                 return (r);
3567         }
3568         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3569         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3570                 /* move to the next one, there can only be a max of two */
3571                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3572                 if (ntohl(r->request_seq) == seq) {
3573                         return (r);
3574                 }
3575         }
3576         /* that seq is not here */
3577         return (NULL);
3578 }
3579
3580 static void
3581 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3582 {
3583         struct sctp_association *asoc;
3584         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3585
3586         if (stcb->asoc.str_reset == NULL) {
3587                 return;
3588         }
3589         asoc = &stcb->asoc;
3590
3591         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3592             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3593         TAILQ_REMOVE(&asoc->control_send_queue,
3594             chk,
3595             sctp_next);
3596         if (chk->data) {
3597                 sctp_m_freem(chk->data);
3598                 chk->data = NULL;
3599         }
3600         asoc->ctrl_queue_cnt--;
3601         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3602         /* sa_ignore NO_NULL_CHK */
3603         stcb->asoc.str_reset = NULL;
3604 }
3605
3606
3607 static int
3608 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3609     uint32_t seq, uint32_t action,
3610     struct sctp_stream_reset_response *respin)
3611 {
3612         uint16_t type;
3613         int lparm_len;
3614         struct sctp_association *asoc = &stcb->asoc;
3615         struct sctp_tmit_chunk *chk;
3616         struct sctp_stream_reset_request *req_param;
3617         struct sctp_stream_reset_out_request *req_out_param;
3618         struct sctp_stream_reset_in_request *req_in_param;
3619         uint32_t number_entries;
3620
3621         if (asoc->stream_reset_outstanding == 0) {
3622                 /* duplicate */
3623                 return (0);
3624         }
3625         if (seq == stcb->asoc.str_reset_seq_out) {
3626                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3627                 if (req_param != NULL) {
3628                         stcb->asoc.str_reset_seq_out++;
3629                         type = ntohs(req_param->ph.param_type);
3630                         lparm_len = ntohs(req_param->ph.param_length);
3631                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3632                                 int no_clear = 0;
3633
3634                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3635                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3636                                 asoc->stream_reset_out_is_outstanding = 0;
3637                                 if (asoc->stream_reset_outstanding)
3638                                         asoc->stream_reset_outstanding--;
3639                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3640                                         /* do it */
3641                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3642                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3643                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3644                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3645                                         /*
3646                                          * Set it up so we don't stop
3647                                          * retransmitting
3648                                          */
3649                                         stcb->asoc.str_reset_seq_out--;
3650                                         asoc->stream_reset_out_is_outstanding = 1;
3651                                         no_clear = 1;
3652                                 } else {
3653                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3654                                 }
3655                                 if (no_clear == 0) {
3656                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3657                                 }
3658                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3659                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3660                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3661                                 if (asoc->stream_reset_outstanding)
3662                                         asoc->stream_reset_outstanding--;
3663                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3664                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3665                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3666                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3667                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3668                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3669                                 }
3670                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3671                                 /* Ok we now may have more streams */
3672                                 int num_stream;
3673
3674                                 num_stream = stcb->asoc.strm_pending_add_size;
3675                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3676                                         /* TSNH */
3677                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3678                                 }
3679                                 stcb->asoc.strm_pending_add_size = 0;
3680                                 if (asoc->stream_reset_outstanding)
3681                                         asoc->stream_reset_outstanding--;
3682                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3683                                         /* Put the new streams into effect */
3684                                         int i;
3685
3686                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3687                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3688                                         }
3689                                         asoc->streamoutcnt += num_stream;
3690                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3691                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3692                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3693                                             SCTP_STREAM_CHANGE_DENIED);
3694                                 } else {
3695                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3696                                             SCTP_STREAM_CHANGE_FAILED);
3697                                 }
3698                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3699                                 if (asoc->stream_reset_outstanding)
3700                                         asoc->stream_reset_outstanding--;
3701                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3702                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3703                                             SCTP_STREAM_CHANGE_DENIED);
3704                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3705                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3706                                             SCTP_STREAM_CHANGE_FAILED);
3707                                 }
3708                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3709                                 /**
3710                                  * a) Adopt the new in tsn.
3711                                  * b) reset the map
3712                                  * c) Adopt the new out-tsn
3713                                  */
3714                                 struct sctp_stream_reset_response_tsn *resp;
3715                                 struct sctp_forward_tsn_chunk fwdtsn;
3716                                 int abort_flag = 0;
3717
3718                                 if (respin == NULL) {
3719                                         /* huh ? */
3720                                         return (0);
3721                                 }
3722                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3723                                         return (0);
3724                                 }
3725                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3726                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3727                                         asoc->stream_reset_outstanding--;
3728                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3729                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3730                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3731                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3732                                         if (abort_flag) {
3733                                                 return (1);
3734                                         }
3735                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3736                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3737                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3738                                         }
3739                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3740                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3741                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3742
3743                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3744                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3745
3746                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3747                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3748
3749                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3750                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3751                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3752                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3753                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3754                                             SCTP_ASSOC_RESET_DENIED);
3755                                 } else {
3756                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3757                                             SCTP_ASSOC_RESET_FAILED);
3758                                 }
3759                         }
3760                         /* get rid of the request and get the request flags */
3761                         if (asoc->stream_reset_outstanding == 0) {
3762                                 sctp_clean_up_stream_reset(stcb);
3763                         }
3764                 }
3765         }
3766         if (asoc->stream_reset_outstanding == 0) {
3767                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3768         }
3769         return (0);
3770 }
3771
3772 static void
3773 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3774     struct sctp_tmit_chunk *chk,
3775     struct sctp_stream_reset_in_request *req, int trunc)
3776 {
3777         uint32_t seq;
3778         int len, i;
3779         int number_entries;
3780         uint16_t temp;
3781
3782         /*
3783          * peer wants me to send a str-reset to him for my outgoing seq's if
3784          * seq_in is right.
3785          */
3786         struct sctp_association *asoc = &stcb->asoc;
3787
3788         seq = ntohl(req->request_seq);
3789         if (asoc->str_reset_seq_in == seq) {
3790                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3791                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3792                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3793                 } else if (trunc) {
3794                         /* Can't do it, since they exceeded our buffer size  */
3795                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3796                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3797                         len = ntohs(req->ph.param_length);
3798                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3799                         if (number_entries) {
3800                                 for (i = 0; i < number_entries; i++) {
3801                                         temp = ntohs(req->list_of_streams[i]);
3802                                         if (temp >= stcb->asoc.streamoutcnt) {
3803                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3804                                                 goto bad_boy;
3805                                         }
3806                                         req->list_of_streams[i] = temp;
3807                                 }
3808                                 for (i = 0; i < number_entries; i++) {
3809                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3810                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3811                                         }
3812                                 }
3813                         } else {
3814                                 /* Its all */
3815                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3816                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3817                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3818                                 }
3819                         }
3820                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3821                 } else {
3822                         /* Can't do it, since we have sent one out */
3823                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3824                 }
3825 bad_boy:
3826                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3827                 asoc->str_reset_seq_in++;
3828         } else if (asoc->str_reset_seq_in - 1 == seq) {
3829                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3830         } else if (asoc->str_reset_seq_in - 2 == seq) {
3831                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3832         } else {
3833                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3834         }
3835         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3836 }
3837
3838 static int
3839 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3840     struct sctp_tmit_chunk *chk,
3841     struct sctp_stream_reset_tsn_request *req)
3842 {
3843         /* reset all in and out and update the tsn */
3844         /*
3845          * A) reset my str-seq's on in and out. B) Select a receive next,
3846          * and set cum-ack to it. Also process this selected number as a
3847          * fwd-tsn as well. C) set in the response my next sending seq.
3848          */
3849         struct sctp_forward_tsn_chunk fwdtsn;
3850         struct sctp_association *asoc = &stcb->asoc;
3851         int abort_flag = 0;
3852         uint32_t seq;
3853
3854         seq = ntohl(req->request_seq);
3855         if (asoc->str_reset_seq_in == seq) {
3856                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3857                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3858                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3859                 } else {
3860                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3861                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3862                         fwdtsn.ch.chunk_flags = 0;
3863                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3864                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3865                         if (abort_flag) {
3866                                 return (1);
3867                         }
3868                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3869                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3870                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3871                         }
3872                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3873                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3874                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3875                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3876                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3877                         atomic_add_int(&asoc->sending_seq, 1);
3878                         /* save off historical data for retrans */
3879                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3880                         asoc->last_sending_seq[0] = asoc->sending_seq;
3881                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3882                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3883                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3884                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3885                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3886                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3887                 }
3888                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3889                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3890                 asoc->str_reset_seq_in++;
3891         } else if (asoc->str_reset_seq_in - 1 == seq) {
3892                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3893                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3894         } else if (asoc->str_reset_seq_in - 2 == seq) {
3895                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3896                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3897         } else {
3898                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3899         }
3900         return (0);
3901 }
3902
3903 static void
3904 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3905     struct sctp_tmit_chunk *chk,
3906     struct sctp_stream_reset_out_request *req, int trunc)
3907 {
3908         uint32_t seq, tsn;
3909         int number_entries, len;
3910         struct sctp_association *asoc = &stcb->asoc;
3911
3912         seq = ntohl(req->request_seq);
3913
3914         /* now if its not a duplicate we process it */
3915         if (asoc->str_reset_seq_in == seq) {
3916                 len = ntohs(req->ph.param_length);
3917                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3918                 /*
3919                  * the sender is resetting, handle the list issue.. we must
3920                  * a) verify if we can do the reset, if so no problem b) If
3921                  * we can't do the reset we must copy the request. c) queue
3922                  * it, and setup the data in processor to trigger it off
3923                  * when needed and dequeue all the queued data.
3924                  */
3925                 tsn = ntohl(req->send_reset_at_tsn);
3926
3927                 /* move the reset action back one */
3928                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3929                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3930                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3931                 } else if (trunc) {
3932                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3933                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3934                         /* we can do it now */
3935                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3936                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3937                 } else {
3938                         /*
3939                          * we must queue it up and thus wait for the TSN's
3940                          * to arrive that are at or before tsn
3941                          */
3942                         struct sctp_stream_reset_list *liste;
3943                         int siz;
3944
3945                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3946                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3947                             siz, SCTP_M_STRESET);
3948                         if (liste == NULL) {
3949                                 /* gak out of memory */
3950                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3951                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3952                                 return;
3953                         }
3954                         liste->seq = seq;
3955                         liste->tsn = tsn;
3956                         liste->number_entries = number_entries;
3957                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3958                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3959                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3960                         x
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\n", __FILE__, __LINE__, __FUNCTION__);
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\n", __FILE__, __LINE__, __FUNCTION__);
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                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4819                                     "INIT not the only chunk");
4820                                 sctp_abort_association(inp, stcb, m, iphlen,
4821                                     src, dst, sh, op_err,
4822                                     mflowtype, mflowid,
4823                                     vrf_id, port);
4824                                 *offset = length;
4825                                 return (NULL);
4826                         }
4827                         /* Honor our resource limit. */
4828                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4829                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4830                                 sctp_abort_association(inp, stcb, m, iphlen,
4831                                     src, dst, sh, op_err,
4832                                     mflowtype, mflowid,
4833                                     vrf_id, port);
4834                                 *offset = length;
4835                                 return (NULL);
4836                         }
4837                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4838                             (struct sctp_init_chunk *)ch, inp,
4839                             stcb, &abort_no_unlock,
4840                             mflowtype, mflowid,
4841                             vrf_id, port);
4842                         *offset = length;
4843                         if ((!abort_no_unlock) && (locked_tcb)) {
4844                                 SCTP_TCB_UNLOCK(locked_tcb);
4845                         }
4846                         return (NULL);
4847                         break;
4848                 case SCTP_PAD_CHUNK:
4849                         break;
4850                 case SCTP_INITIATION_ACK:
4851                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4852                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4853                                 /* We are not interested anymore */
4854                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4855                                         ;
4856                                 } else {
4857                                         if (locked_tcb != stcb) {
4858                                                 /* Very unlikely */
4859                                                 SCTP_TCB_UNLOCK(locked_tcb);
4860                                         }
4861                                         *offset = length;
4862                                         if (stcb) {
4863 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4864                                                 so = SCTP_INP_SO(inp);
4865                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4866                                                 SCTP_TCB_UNLOCK(stcb);
4867                                                 SCTP_SOCKET_LOCK(so, 1);
4868                                                 SCTP_TCB_LOCK(stcb);
4869                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4870 #endif
4871                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4872                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4873 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4874                                                 SCTP_SOCKET_UNLOCK(so, 1);
4875 #endif
4876                                         }
4877                                         return (NULL);
4878                                 }
4879                         }
4880                         /* The INIT-ACK chunk must be the only chunk. */
4881                         if ((num_chunks > 1) ||
4882                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4883                                 *offset = length;
4884                                 if (locked_tcb) {
4885                                         SCTP_TCB_UNLOCK(locked_tcb);
4886                                 }
4887                                 return (NULL);
4888                         }
4889                         if ((netp) && (*netp)) {
4890                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4891                                     src, dst, sh,
4892                                     (struct sctp_init_ack_chunk *)ch,
4893                                     stcb, *netp,
4894                                     &abort_no_unlock,
4895                                     mflowtype, mflowid,
4896                                     vrf_id);
4897                         } else {
4898                                 ret = -1;
4899                         }
4900                         *offset = length;
4901                         if (abort_no_unlock) {
4902                                 return (NULL);
4903                         }
4904                         /*
4905                          * Special case, I must call the output routine to
4906                          * get the cookie echoed
4907                          */
4908                         if ((stcb != NULL) && (ret == 0)) {
4909                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4910                         }
4911                         if (locked_tcb) {
4912                                 SCTP_TCB_UNLOCK(locked_tcb);
4913                         }
4914                         return (NULL);
4915                         break;
4916                 case SCTP_SELECTIVE_ACK:
4917                         {
4918                                 struct sctp_sack_chunk *sack;
4919                                 int abort_now = 0;
4920                                 uint32_t a_rwnd, cum_ack;
4921                                 uint16_t num_seg, num_dup;
4922                                 uint8_t flags;
4923                                 int offset_seg, offset_dup;
4924
4925                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4926                                 SCTP_STAT_INCR(sctps_recvsacks);
4927                                 if (stcb == NULL) {
4928                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4929                                         break;
4930                                 }
4931                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4932                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4933                                         break;
4934                                 }
4935                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4936                                         /*-
4937                                          * If we have sent a shutdown-ack, we will pay no
4938                                          * attention to a sack sent in to us since
4939                                          * we don't care anymore.
4940                                          */
4941                                         break;
4942                                 }
4943                                 sack = (struct sctp_sack_chunk *)ch;
4944                                 flags = ch->chunk_flags;
4945                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4946                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4947                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4948                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4949                                 if (sizeof(struct sctp_sack_chunk) +
4950                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4951                                     num_dup * sizeof(uint32_t) != chk_length) {
4952                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4953                                         break;
4954                                 }
4955                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4956                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4957                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4958                                     cum_ack, num_seg, a_rwnd);
4959                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4960                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4961                                     (num_seg == 0) &&
4962                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4963                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4964                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4965                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4966                                     ) {
4967                                         /*
4968                                          * We have a SIMPLE sack having no
4969                                          * prior segments and data on sent
4970                                          * queue to be acked.. Use the
4971                                          * faster path sack processing. We
4972                                          * also allow window update sacks
4973                                          * with no missing segments to go
4974                                          * this way too.
4975                                          */
4976                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4977                                 } else {
4978                                         if (netp && *netp)
4979                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4980                                                     num_seg, 0, num_dup, &abort_now, flags,
4981                                                     cum_ack, a_rwnd, ecne_seen);
4982                                 }
4983                                 if (abort_now) {
4984                                         /* ABORT signal from sack processing */
4985                                         *offset = length;
4986                                         return (NULL);
4987                                 }
4988                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4989                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4990                                     (stcb->asoc.stream_queue_cnt == 0)) {
4991                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4992                                 }
4993                         }
4994                         break;
4995                         /*
4996                          * EY - nr_sack:  If the received chunk is an
4997                          * nr_sack chunk
4998                          */
4999                 case SCTP_NR_SELECTIVE_ACK:
5000                         {
5001                                 struct sctp_nr_sack_chunk *nr_sack;
5002                                 int abort_now = 0;
5003                                 uint32_t a_rwnd, cum_ack;
5004                                 uint16_t num_seg, num_nr_seg, num_dup;
5005                                 uint8_t flags;
5006                                 int offset_seg, offset_dup;
5007
5008                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
5009                                 SCTP_STAT_INCR(sctps_recvsacks);
5010                                 if (stcb == NULL) {
5011                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
5012                                         break;
5013                                 }
5014                                 if (stcb->asoc.nrsack_supported == 0) {
5015                                         goto unknown_chunk;
5016                                 }
5017                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5018                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
5019                                         break;
5020                                 }
5021                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5022                                         /*-
5023                                          * If we have sent a shutdown-ack, we will pay no
5024                                          * attention to a sack sent in to us since
5025                                          * we don't care anymore.
5026                                          */
5027                                         break;
5028                                 }
5029                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5030                                 flags = ch->chunk_flags;
5031                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5032                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5033                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5034                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5035                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
5036                                 if (sizeof(struct sctp_nr_sack_chunk) +
5037                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5038                                     num_dup * sizeof(uint32_t) != chk_length) {
5039                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5040                                         break;
5041                                 }
5042                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5043                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5044                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5045                                     cum_ack, num_seg, a_rwnd);
5046                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5047                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5048                                     (num_seg == 0) && (num_nr_seg == 0) &&
5049                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5050                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5051                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5052                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5053                                         /*
5054                                          * We have a SIMPLE sack having no
5055                                          * prior segments and data on sent
5056                                          * queue to be acked. Use the faster
5057                                          * path sack processing. We also
5058                                          * allow window update sacks with no
5059                                          * missing segments to go this way
5060                                          * too.
5061                                          */
5062                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5063                                             &abort_now, ecne_seen);
5064                                 } else {
5065                                         if (netp && *netp)
5066                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5067                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5068                                                     cum_ack, a_rwnd, ecne_seen);
5069                                 }
5070                                 if (abort_now) {
5071                                         /* ABORT signal from sack processing */
5072                                         *offset = length;
5073                                         return (NULL);
5074                                 }
5075                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5076                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5077                                     (stcb->asoc.stream_queue_cnt == 0)) {
5078                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5079                                 }
5080                         }
5081                         break;
5082
5083                 case SCTP_HEARTBEAT_REQUEST:
5084                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5085                         if ((stcb) && netp && *netp) {
5086                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5087                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5088                                     chk_length, *netp);
5089
5090                                 /* He's alive so give him credit */
5091                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5092                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5093                                             stcb->asoc.overall_error_count,
5094                                             0,
5095                                             SCTP_FROM_SCTP_INPUT,
5096                                             __LINE__);
5097                                 }
5098                                 stcb->asoc.overall_error_count = 0;
5099                         }
5100                         break;
5101                 case SCTP_HEARTBEAT_ACK:
5102                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5103                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5104                                 /* Its not ours */
5105                                 *offset = length;
5106                                 if (locked_tcb) {
5107                                         SCTP_TCB_UNLOCK(locked_tcb);
5108                                 }
5109                                 return (NULL);
5110                         }
5111                         /* He's alive so give him credit */
5112                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5113                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5114                                     stcb->asoc.overall_error_count,
5115                                     0,
5116                                     SCTP_FROM_SCTP_INPUT,
5117                                     __LINE__);
5118                         }
5119                         stcb->asoc.overall_error_count = 0;
5120                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5121                         if (netp && *netp)
5122                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5123                                     stcb, *netp);
5124                         break;
5125                 case SCTP_ABORT_ASSOCIATION:
5126                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5127                             (void *)stcb);
5128                         if ((stcb) && netp && *netp)
5129                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5130                                     stcb, *netp);
5131                         *offset = length;
5132                         return (NULL);
5133                         break;
5134                 case SCTP_SHUTDOWN:
5135                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5136                             (void *)stcb);
5137                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5138                                 *offset = length;
5139                                 if (locked_tcb) {
5140                                         SCTP_TCB_UNLOCK(locked_tcb);
5141                                 }
5142                                 return (NULL);
5143                         }
5144                         if (netp && *netp) {
5145                                 int abort_flag = 0;
5146
5147                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5148                                     stcb, *netp, &abort_flag);
5149                                 if (abort_flag) {
5150                                         *offset = length;
5151                                         return (NULL);
5152                                 }
5153                         }
5154                         break;
5155                 case SCTP_SHUTDOWN_ACK:
5156                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5157                         if ((stcb) && (netp) && (*netp))
5158                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5159                         *offset = length;
5160                         return (NULL);
5161                         break;
5162
5163                 case SCTP_OPERATION_ERROR:
5164                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5165                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5166                                 *offset = length;
5167                                 return (NULL);
5168                         }
5169                         break;
5170                 case SCTP_COOKIE_ECHO:
5171                         SCTPDBG(SCTP_DEBUG_INPUT3,
5172                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5173                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5174                                 ;
5175                         } else {
5176                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5177                                         /* We are not interested anymore */
5178                         abend:
5179                                         if (stcb) {
5180                                                 SCTP_TCB_UNLOCK(stcb);
5181                                         }
5182                                         *offset = length;
5183                                         return (NULL);
5184                                 }
5185                         }
5186                         /*
5187                          * First are we accepting? We do this again here
5188                          * since it is possible that a previous endpoint WAS
5189                          * listening responded to a INIT-ACK and then
5190                          * closed. We opened and bound.. and are now no
5191                          * longer listening.
5192                          */
5193
5194                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5195                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5196                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5197                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5198                                         sctp_abort_association(inp, stcb, m, iphlen,
5199                                             src, dst, sh, op_err,
5200                                             mflowtype, mflowid,
5201                                             vrf_id, port);
5202                                 }
5203                                 *offset = length;
5204                                 return (NULL);
5205                         } else {
5206                                 struct mbuf *ret_buf;
5207                                 struct sctp_inpcb *linp;
5208
5209                                 if (stcb) {
5210                                         linp = NULL;
5211                                 } else {
5212                                         linp = inp;
5213                                 }
5214
5215                                 if (linp) {
5216                                         SCTP_ASOC_CREATE_LOCK(linp);
5217                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5218                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5219                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5220                                                 goto abend;
5221                                         }
5222                                 }
5223                                 if (netp) {
5224                                         ret_buf =
5225                                             sctp_handle_cookie_echo(m, iphlen,
5226                                             *offset,
5227                                             src, dst,
5228                                             sh,
5229                                             (struct sctp_cookie_echo_chunk *)ch,
5230                                             &inp, &stcb, netp,
5231                                             auth_skipped,
5232                                             auth_offset,
5233                                             auth_len,
5234                                             &locked_tcb,
5235                                             mflowtype,
5236                                             mflowid,
5237                                             vrf_id,
5238                                             port);
5239                                 } else {
5240                                         ret_buf = NULL;
5241                                 }
5242                                 if (linp) {
5243                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5244                                 }
5245                                 if (ret_buf == NULL) {
5246                                         if (locked_tcb) {
5247                                                 SCTP_TCB_UNLOCK(locked_tcb);
5248                                         }
5249                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5250                                             "GAK, null buffer\n");
5251                                         *offset = length;
5252                                         return (NULL);
5253                                 }
5254                                 /* if AUTH skipped, see if it verified... */
5255                                 if (auth_skipped) {
5256                                         got_auth = 1;
5257                                         auth_skipped = 0;
5258                                 }
5259                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5260                                         /*
5261                                          * Restart the timer if we have
5262                                          * pending data
5263                                          */
5264                                         struct sctp_tmit_chunk *chk;
5265
5266                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5267                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5268                                 }
5269                         }
5270                         break;
5271                 case SCTP_COOKIE_ACK:
5272                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5273                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5274                                 if (locked_tcb) {
5275                                         SCTP_TCB_UNLOCK(locked_tcb);
5276                                 }
5277                                 return (NULL);
5278                         }
5279                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5280                                 /* We are not interested anymore */
5281                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5282                                         ;
5283                                 } else if (stcb) {
5284 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5285                                         so = SCTP_INP_SO(inp);
5286                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5287                                         SCTP_TCB_UNLOCK(stcb);
5288                                         SCTP_SOCKET_LOCK(so, 1);
5289                                         SCTP_TCB_LOCK(stcb);
5290                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5291 #endif
5292                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5293                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5294 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5295                                         SCTP_SOCKET_UNLOCK(so, 1);
5296 #endif
5297                                         *offset = length;
5298                                         return (NULL);
5299                                 }
5300                         }
5301                         /* He's alive so give him credit */
5302                         if ((stcb) && netp && *netp) {
5303                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5304                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5305                                             stcb->asoc.overall_error_count,
5306                                             0,
5307                                             SCTP_FROM_SCTP_INPUT,
5308                                             __LINE__);
5309                                 }
5310                                 stcb->asoc.overall_error_count = 0;
5311                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5312                         }
5313                         break;
5314                 case SCTP_ECN_ECHO:
5315                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5316                         /* He's alive so give him credit */
5317                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5318                                 /* Its not ours */
5319                                 if (locked_tcb) {
5320                                         SCTP_TCB_UNLOCK(locked_tcb);
5321                                 }
5322                                 *offset = length;
5323                                 return (NULL);
5324                         }
5325                         if (stcb) {
5326                                 if (stcb->asoc.ecn_supported == 0) {
5327                                         goto unknown_chunk;
5328                                 }
5329                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5330                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5331                                             stcb->asoc.overall_error_count,
5332                                             0,
5333                                             SCTP_FROM_SCTP_INPUT,
5334                                             __LINE__);
5335                                 }
5336                                 stcb->asoc.overall_error_count = 0;
5337                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5338                                     stcb);
5339                                 ecne_seen = 1;
5340                         }
5341                         break;
5342                 case SCTP_ECN_CWR:
5343                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5344                         /* He's alive so give him credit */
5345                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5346                                 /* Its not ours */
5347                                 if (locked_tcb) {
5348                                         SCTP_TCB_UNLOCK(locked_tcb);
5349                                 }
5350                                 *offset = length;
5351                                 return (NULL);
5352                         }
5353                         if (stcb) {
5354                                 if (stcb->asoc.ecn_supported == 0) {
5355                                         goto unknown_chunk;
5356                                 }
5357                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5358                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5359                                             stcb->asoc.overall_error_count,
5360                                             0,
5361                                             SCTP_FROM_SCTP_INPUT,
5362                                             __LINE__);
5363                                 }
5364                                 stcb->asoc.overall_error_count = 0;
5365                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5366                         }
5367                         break;
5368                 case SCTP_SHUTDOWN_COMPLETE:
5369                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5370                         /* must be first and only chunk */
5371                         if ((num_chunks > 1) ||
5372                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5373                                 *offset = length;
5374                                 if (locked_tcb) {
5375                                         SCTP_TCB_UNLOCK(locked_tcb);
5376                                 }
5377                                 return (NULL);
5378                         }
5379                         if ((stcb) && netp && *netp) {
5380                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5381                                     stcb, *netp);
5382                         }
5383                         *offset = length;
5384                         return (NULL);
5385                         break;
5386                 case SCTP_ASCONF:
5387                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5388                         /* He's alive so give him credit */
5389                         if (stcb) {
5390                                 if (stcb->asoc.asconf_supported == 0) {
5391                                         goto unknown_chunk;
5392                                 }
5393                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5394                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5395                                             stcb->asoc.overall_error_count,
5396                                             0,
5397                                             SCTP_FROM_SCTP_INPUT,
5398                                             __LINE__);
5399                                 }
5400                                 stcb->asoc.overall_error_count = 0;
5401                                 sctp_handle_asconf(m, *offset, src,
5402                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5403                                 asconf_cnt++;
5404                         }
5405                         break;
5406                 case SCTP_ASCONF_ACK:
5407                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5408                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5409                                 /* Its not ours */
5410                                 if (locked_tcb) {
5411                                         SCTP_TCB_UNLOCK(locked_tcb);
5412                                 }
5413                                 *offset = length;
5414                                 return (NULL);
5415                         }
5416                         if ((stcb) && netp && *netp) {
5417                                 if (stcb->asoc.asconf_supported == 0) {
5418                                         goto unknown_chunk;
5419                                 }
5420                                 /* He's alive so give him credit */
5421                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5422                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5423                                             stcb->asoc.overall_error_count,
5424                                             0,
5425                                             SCTP_FROM_SCTP_INPUT,
5426                                             __LINE__);
5427                                 }
5428                                 stcb->asoc.overall_error_count = 0;
5429                                 sctp_handle_asconf_ack(m, *offset,
5430                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5431                                 if (abort_no_unlock)
5432                                         return (NULL);
5433                         }
5434                         break;
5435                 case SCTP_FORWARD_CUM_TSN:
5436                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5437                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5438                                 /* Its not ours */
5439                                 if (locked_tcb) {
5440                                         SCTP_TCB_UNLOCK(locked_tcb);
5441                                 }
5442                                 *offset = length;
5443                                 return (NULL);
5444                         }
5445                         /* He's alive so give him credit */
5446                         if (stcb) {
5447                                 int abort_flag = 0;
5448
5449                                 if (stcb->asoc.prsctp_supported == 0) {
5450                                         goto unknown_chunk;
5451                                 }
5452                                 stcb->asoc.overall_error_count = 0;
5453                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5454                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5455                                             stcb->asoc.overall_error_count,
5456                                             0,
5457                                             SCTP_FROM_SCTP_INPUT,
5458                                             __LINE__);
5459                                 }
5460                                 *fwd_tsn_seen = 1;
5461                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5462                                         /* We are not interested anymore */
5463 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5464                                         so = SCTP_INP_SO(inp);
5465                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5466                                         SCTP_TCB_UNLOCK(stcb);
5467                                         SCTP_SOCKET_LOCK(so, 1);
5468                                         SCTP_TCB_LOCK(stcb);
5469                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5470 #endif
5471                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5472                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5473 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5474                                         SCTP_SOCKET_UNLOCK(so, 1);
5475 #endif
5476                                         *offset = length;
5477                                         return (NULL);
5478                                 }
5479                                 sctp_handle_forward_tsn(stcb,
5480                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5481                                 if (abort_flag) {
5482                                         *offset = length;
5483                                         return (NULL);
5484                                 } else {
5485                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5486                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5487                                                     stcb->asoc.overall_error_count,
5488                                                     0,
5489                                                     SCTP_FROM_SCTP_INPUT,
5490                                                     __LINE__);
5491                                         }
5492                                         stcb->asoc.overall_error_count = 0;
5493                                 }
5494
5495                         }
5496                         break;
5497                 case SCTP_STREAM_RESET:
5498                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5499                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5500                                 /* Its not ours */
5501                                 if (locked_tcb) {
5502                                         SCTP_TCB_UNLOCK(locked_tcb);
5503                                 }
5504                                 *offset = length;
5505                                 return (NULL);
5506                         }
5507                         if (stcb->asoc.reconfig_supported == 0) {
5508                                 goto unknown_chunk;
5509                         }
5510                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5511                                 /* stop processing */
5512                                 *offset = length;
5513                                 return (NULL);
5514                         }
5515                         break;
5516                 case SCTP_PACKET_DROPPED:
5517                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5518                         /* re-get it all please */
5519                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5520                                 /* Its not ours */
5521                                 if (locked_tcb) {
5522                                         SCTP_TCB_UNLOCK(locked_tcb);
5523                                 }
5524                                 *offset = length;
5525                                 return (NULL);
5526                         }
5527                         if (ch && (stcb) && netp && (*netp)) {
5528                                 if (stcb->asoc.pktdrop_supported == 0) {
5529                                         goto unknown_chunk;
5530                                 }
5531                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5532                                     stcb, *netp,
5533                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5534
5535                         }
5536                         break;
5537                 case SCTP_AUTHENTICATION:
5538                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5539                         if (stcb == NULL) {
5540                                 /* save the first AUTH for later processing */
5541                                 if (auth_skipped == 0) {
5542                                         auth_offset = *offset;
5543                                         auth_len = chk_length;
5544                                         auth_skipped = 1;
5545                                 }
5546                                 /* skip this chunk (temporarily) */
5547                                 goto next_chunk;
5548                         }
5549                         if (stcb->asoc.auth_supported == 0) {
5550                                 goto unknown_chunk;
5551                         }
5552                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5553                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5554                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5555                                 /* Its not ours */
5556                                 if (locked_tcb) {
5557                                         SCTP_TCB_UNLOCK(locked_tcb);
5558                                 }
5559                                 *offset = length;
5560                                 return (NULL);
5561                         }
5562                         if (got_auth == 1) {
5563                                 /* skip this chunk... it's already auth'd */
5564                                 goto next_chunk;
5565                         }
5566                         got_auth = 1;
5567                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5568                             m, *offset)) {
5569                                 /* auth HMAC failed so dump the packet */
5570                                 *offset = length;
5571                                 return (stcb);
5572                         } else {
5573                                 /* remaining chunks are HMAC checked */
5574                                 stcb->asoc.authenticated = 1;
5575                         }
5576                         break;
5577
5578                 default:
5579         unknown_chunk:
5580                         /* it's an unknown chunk! */
5581                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5582                                 struct mbuf *mm;
5583                                 struct sctp_paramhdr *phd;
5584                                 int len;
5585
5586                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5587                                     0, M_NOWAIT, 1, MT_DATA);
5588                                 if (mm) {
5589                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5590                                         phd = mtod(mm, struct sctp_paramhdr *);
5591                                         /*
5592                                          * We cheat and use param type since
5593                                          * we did not bother to define a
5594                                          * error cause struct. They are the
5595                                          * same basic format with different
5596                                          * names.
5597                                          */
5598                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5599                                         phd->param_length = htons(len + sizeof(*phd));
5600                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5601                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5602                                         if (SCTP_BUF_NEXT(mm)) {
5603                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) {
5604                                                         sctp_m_freem(mm);
5605                                                 } else {
5606 #ifdef SCTP_MBUF_LOGGING
5607                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5608                                                                 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY);
5609                                                         }
5610 #endif
5611                                                         sctp_queue_op_err(stcb, mm);
5612                                                 }
5613                                         } else {
5614                                                 sctp_m_freem(mm);
5615                                         }
5616                                 }
5617                         }
5618                         if ((ch->chunk_type & 0x80) == 0) {
5619                                 /* discard this packet */
5620                                 *offset = length;
5621                                 return (stcb);
5622                         }       /* else skip this bad chunk and continue... */
5623                         break;
5624                 }               /* switch (ch->chunk_type) */
5625
5626
5627 next_chunk:
5628                 /* get the next chunk */
5629                 *offset += SCTP_SIZE32(chk_length);
5630                 if (*offset >= length) {
5631                         /* no more data left in the mbuf chain */
5632                         break;
5633                 }
5634                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5635                     sizeof(struct sctp_chunkhdr), chunk_buf);
5636                 if (ch == NULL) {
5637                         if (locked_tcb) {
5638                                 SCTP_TCB_UNLOCK(locked_tcb);
5639                         }
5640                         *offset = length;
5641                         return (NULL);
5642                 }
5643         }                       /* while */
5644
5645         if (asconf_cnt > 0 && stcb != NULL) {
5646                 sctp_send_asconf_ack(stcb);
5647         }
5648         return (stcb);
5649 }
5650
5651
5652 #ifdef INVARIANTS
5653 #ifdef __GNUC__
5654 __attribute__((noinline))
5655 #endif
5656         void
5657              sctp_validate_no_locks(struct sctp_inpcb *inp)
5658 {
5659         struct sctp_tcb *lstcb;
5660
5661         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5662                 if (mtx_owned(&lstcb->tcb_mtx)) {
5663                         panic("Own lock on stcb at return from input");
5664                 }
5665         }
5666         if (mtx_owned(&inp->inp_create_mtx)) {
5667                 panic("Own create lock on inp");
5668         }
5669         if (mtx_owned(&inp->inp_mtx)) {
5670                 panic("Own inp lock on inp");
5671         }
5672 }
5673
5674 #endif
5675
5676 /*
5677  * common input chunk processing (v4 and v6)
5678  */
5679 void
5680 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5681     struct sockaddr *src, struct sockaddr *dst,
5682     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5683 #if !defined(SCTP_WITH_NO_CSUM)
5684     uint8_t compute_crc,
5685 #endif
5686     uint8_t ecn_bits,
5687     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5688     uint32_t vrf_id, uint16_t port)
5689 {
5690         uint32_t high_tsn;
5691         int fwd_tsn_seen = 0, data_processed = 0;
5692         struct mbuf *m = *mm, *op_err;
5693         char msg[SCTP_DIAG_INFO_LEN];
5694         int un_sent;
5695         int cnt_ctrl_ready = 0;
5696         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5697         struct sctp_tcb *stcb = NULL;
5698         struct sctp_nets *net = NULL;
5699
5700         SCTP_STAT_INCR(sctps_recvdatagrams);
5701 #ifdef SCTP_AUDITING_ENABLED
5702         sctp_audit_log(0xE0, 1);
5703         sctp_auditing(0, inp, stcb, net);
5704 #endif
5705 #if !defined(SCTP_WITH_NO_CSUM)
5706         if (compute_crc != 0) {
5707                 uint32_t check, calc_check;
5708
5709                 check = sh->checksum;
5710                 sh->checksum = 0;
5711                 calc_check = sctp_calculate_cksum(m, iphlen);
5712                 sh->checksum = check;
5713                 if (calc_check != check) {
5714                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5715                             calc_check, check, (void *)m, length, iphlen);
5716                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5717                             sh, ch, &inp, &net, vrf_id);
5718 #if defined(INET) || defined(INET6)
5719                         if ((net != NULL) && (port != 0)) {
5720                                 if (net->port == 0) {
5721                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5722                                 }
5723                                 net->port = port;
5724                         }
5725 #endif
5726                         if (net != NULL) {
5727                                 net->flowtype = mflowtype;
5728                                 net->flowid = mflowid;
5729                         }
5730                         if ((inp != NULL) && (stcb != NULL)) {
5731                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5732                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5733                         } else if ((inp != NULL) && (stcb == NULL)) {
5734                                 inp_decr = inp;
5735                         }
5736                         SCTP_STAT_INCR(sctps_badsum);
5737                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5738                         goto out;
5739                 }
5740         }
5741 #endif
5742         /* Destination port of 0 is illegal, based on RFC4960. */
5743         if (sh->dest_port == 0) {
5744                 SCTP_STAT_INCR(sctps_hdrops);
5745                 goto out;
5746         }
5747         stcb = sctp_findassociation_addr(m, offset, src, dst,
5748             sh, ch, &inp, &net, vrf_id);
5749 #if defined(INET) || defined(INET6)
5750         if ((net != NULL) && (port != 0)) {
5751                 if (net->port == 0) {
5752                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5753                 }
5754                 net->port = port;
5755         }
5756 #endif
5757         if (net != NULL) {
5758                 net->flowtype = mflowtype;
5759                 net->flowid = mflowid;
5760         }
5761         if (inp == NULL) {
5762                 SCTP_STAT_INCR(sctps_noport);
5763                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5764                         goto out;
5765                 }
5766                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5767                         sctp_send_shutdown_complete2(src, dst, sh,
5768                             mflowtype, mflowid, fibnum,
5769                             vrf_id, port);
5770                         goto out;
5771                 }
5772                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5773                         goto out;
5774                 }
5775                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5776                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5777                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5778                             (ch->chunk_type != SCTP_INIT))) {
5779                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5780                                     "Out of the blue");
5781                                 sctp_send_abort(m, iphlen, src, dst,
5782                                     sh, 0, op_err,
5783                                     mflowtype, mflowid, fibnum,
5784                                     vrf_id, port);
5785                         }
5786                 }
5787                 goto out;
5788         } else if (stcb == NULL) {
5789                 inp_decr = inp;
5790         }
5791 #ifdef IPSEC
5792         /*-
5793          * I very much doubt any of the IPSEC stuff will work but I have no
5794          * idea, so I will leave it in place.
5795          */
5796         if (inp != NULL) {
5797                 switch (dst->sa_family) {
5798 #ifdef INET
5799                 case AF_INET:
5800                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5801                                 SCTP_STAT_INCR(sctps_hdrops);
5802                                 goto out;
5803                         }
5804                         break;
5805 #endif
5806 #ifdef INET6
5807                 case AF_INET6:
5808                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5809                                 SCTP_STAT_INCR(sctps_hdrops);
5810                                 goto out;
5811                         }
5812                         break;
5813 #endif
5814                 default:
5815                         break;
5816                 }
5817         }
5818 #endif
5819         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5820             (void *)m, iphlen, offset, length, (void *)stcb);
5821         if (stcb) {
5822                 /* always clear this before beginning a packet */
5823                 stcb->asoc.authenticated = 0;
5824                 stcb->asoc.seen_a_sack_this_pkt = 0;
5825                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5826                     (void *)stcb, stcb->asoc.state);
5827
5828                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5829                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5830                         /*-
5831                          * If we hit here, we had a ref count
5832                          * up when the assoc was aborted and the
5833                          * timer is clearing out the assoc, we should
5834                          * NOT respond to any packet.. its OOTB.
5835                          */
5836                         SCTP_TCB_UNLOCK(stcb);
5837                         stcb = NULL;
5838                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5839                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5840                             msg);
5841                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5842                             mflowtype, mflowid, inp->fibnum,
5843                             vrf_id, port);
5844                         goto out;
5845                 }
5846         }
5847         if (IS_SCTP_CONTROL(ch)) {
5848                 /* process the control portion of the SCTP packet */
5849                 /* sa_ignore NO_NULL_CHK */
5850                 stcb = sctp_process_control(m, iphlen, &offset, length,
5851                     src, dst, sh, ch,
5852                     inp, stcb, &net, &fwd_tsn_seen,
5853                     mflowtype, mflowid, fibnum,
5854                     vrf_id, port);
5855                 if (stcb) {
5856                         /*
5857                          * This covers us if the cookie-echo was there and
5858                          * it changes our INP.
5859                          */
5860                         inp = stcb->sctp_ep;
5861 #if defined(INET) || defined(INET6)
5862                         if ((net) && (port)) {
5863                                 if (net->port == 0) {
5864                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5865                                 }
5866                                 net->port = port;
5867                         }
5868 #endif
5869                 }
5870         } else {
5871                 /*
5872                  * no control chunks, so pre-process DATA chunks (these
5873                  * checks are taken care of by control processing)
5874                  */
5875
5876                 /*
5877                  * if DATA only packet, and auth is required, then punt...
5878                  * can't have authenticated without any AUTH (control)
5879                  * chunks
5880                  */
5881                 if ((stcb != NULL) &&
5882                     (stcb->asoc.auth_supported == 1) &&
5883                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5884                         /* "silently" ignore */
5885                         SCTP_STAT_INCR(sctps_recvauthmissing);
5886                         goto out;
5887                 }
5888                 if (stcb == NULL) {
5889                         /* out of the blue DATA chunk */
5890                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5891                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5892                             msg);
5893                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5894                             mflowtype, mflowid, fibnum,
5895                             vrf_id, port);
5896                         goto out;
5897                 }
5898                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5899                         /* v_tag mismatch! */
5900                         SCTP_STAT_INCR(sctps_badvtag);
5901                         goto out;
5902                 }
5903         }
5904
5905         if (stcb == NULL) {
5906                 /*
5907                  * no valid TCB for this packet, or we found it's a bad
5908                  * packet while processing control, or we're done with this
5909                  * packet (done or skip rest of data), so we drop it...
5910                  */
5911                 goto out;
5912         }
5913         /*
5914          * DATA chunk processing
5915          */
5916         /* plow through the data chunks while length > offset */
5917
5918         /*
5919          * Rest should be DATA only.  Check authentication state if AUTH for
5920          * DATA is required.
5921          */
5922         if ((length > offset) &&
5923             (stcb != NULL) &&
5924             (stcb->asoc.auth_supported == 1) &&
5925             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5926             !stcb->asoc.authenticated) {
5927                 /* "silently" ignore */
5928                 SCTP_STAT_INCR(sctps_recvauthmissing);
5929                 SCTPDBG(SCTP_DEBUG_AUTH1,
5930                     "Data chunk requires AUTH, skipped\n");
5931                 goto trigger_send;
5932         }
5933         if (length > offset) {
5934                 int retval;
5935
5936                 /*
5937                  * First check to make sure our state is correct. We would
5938                  * not get here unless we really did have a tag, so we don't
5939                  * abort if this happens, just dump the chunk silently.
5940                  */
5941                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5942                 case SCTP_STATE_COOKIE_ECHOED:
5943                         /*
5944                          * we consider data with valid tags in this state
5945                          * shows us the cookie-ack was lost. Imply it was
5946                          * there.
5947                          */
5948                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5949                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5950                                     stcb->asoc.overall_error_count,
5951                                     0,
5952                                     SCTP_FROM_SCTP_INPUT,
5953                                     __LINE__);
5954                         }
5955                         stcb->asoc.overall_error_count = 0;
5956                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5957                         break;
5958                 case SCTP_STATE_COOKIE_WAIT:
5959                         /*
5960                          * We consider OOTB any data sent during asoc setup.
5961                          */
5962                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5963                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5964                             msg);
5965                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5966                             mflowtype, mflowid, inp->fibnum,
5967                             vrf_id, port);
5968                         goto out;
5969                         /* sa_ignore NOTREACHED */
5970                         break;
5971                 case SCTP_STATE_EMPTY:  /* should not happen */
5972                 case SCTP_STATE_INUSE:  /* should not happen */
5973                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5974                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5975                 default:
5976                         goto out;
5977                         /* sa_ignore NOTREACHED */
5978                         break;
5979                 case SCTP_STATE_OPEN:
5980                 case SCTP_STATE_SHUTDOWN_SENT:
5981                         break;
5982                 }
5983                 /* plow through the data chunks while length > offset */
5984                 retval = sctp_process_data(mm, iphlen, &offset, length,
5985                     src, dst, sh,
5986                     inp, stcb, net, &high_tsn,
5987                     mflowtype, mflowid,
5988                     vrf_id, port);
5989                 if (retval == 2) {
5990                         /*
5991                          * The association aborted, NO UNLOCK needed since
5992                          * the association is destroyed.
5993                          */
5994                         stcb = NULL;
5995                         goto out;
5996                 }
5997                 data_processed = 1;
5998                 /*
5999                  * Anything important needs to have been m_copy'ed in
6000                  * process_data
6001                  */
6002         }
6003         /* take care of ecn */
6004         if ((data_processed == 1) &&
6005             (stcb->asoc.ecn_supported == 1) &&
6006             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
6007                 /* Yep, we need to add a ECNE */
6008                 sctp_send_ecn_echo(stcb, net, high_tsn);
6009         }
6010         if ((data_processed == 0) && (fwd_tsn_seen)) {
6011                 int was_a_gap;
6012                 uint32_t highest_tsn;
6013
6014                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
6015                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
6016                 } else {
6017                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
6018                 }
6019                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
6020                 stcb->asoc.send_sack = 1;
6021                 sctp_sack_check(stcb, was_a_gap);
6022         } else if (fwd_tsn_seen) {
6023                 stcb->asoc.send_sack = 1;
6024         }
6025         /* trigger send of any chunks in queue... */
6026 trigger_send:
6027 #ifdef SCTP_AUDITING_ENABLED
6028         sctp_audit_log(0xE0, 2);
6029         sctp_auditing(1, inp, stcb, net);
6030 #endif
6031         SCTPDBG(SCTP_DEBUG_INPUT1,
6032             "Check for chunk output prw:%d tqe:%d tf=%d\n",
6033             stcb->asoc.peers_rwnd,
6034             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
6035             stcb->asoc.total_flight);
6036         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
6037         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
6038                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
6039         }
6040         if (cnt_ctrl_ready ||
6041             ((un_sent) &&
6042             (stcb->asoc.peers_rwnd > 0 ||
6043             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
6044                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
6045                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
6046                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6047         }
6048 #ifdef SCTP_AUDITING_ENABLED
6049         sctp_audit_log(0xE0, 3);
6050         sctp_auditing(2, inp, stcb, net);
6051 #endif
6052 out:
6053         if (stcb != NULL) {
6054                 SCTP_TCB_UNLOCK(stcb);
6055         }
6056         if (inp_decr != NULL) {
6057                 /* reduce ref-count */
6058                 SCTP_INP_WLOCK(inp_decr);
6059                 SCTP_INP_DECR_REF(inp_decr);
6060                 SCTP_INP_WUNLOCK(inp_decr);
6061         }
6062 #ifdef INVARIANTS
6063         if (inp != NULL) {
6064                 sctp_validate_no_locks(inp);
6065         }
6066 #endif
6067         return;
6068 }
6069
6070 #ifdef INET
6071 void
6072 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6073 {
6074         struct mbuf *m;
6075         int iphlen;
6076         uint32_t vrf_id = 0;
6077         uint8_t ecn_bits;
6078         struct sockaddr_in src, dst;
6079         struct ip *ip;
6080         struct sctphdr *sh;
6081         struct sctp_chunkhdr *ch;
6082         int length, offset;
6083
6084 #if !defined(SCTP_WITH_NO_CSUM)
6085         uint8_t compute_crc;
6086
6087 #endif
6088         uint32_t mflowid;
6089         uint8_t mflowtype;
6090         uint16_t fibnum;
6091
6092         iphlen = off;
6093         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6094                 SCTP_RELEASE_PKT(i_pak);
6095                 return;
6096         }
6097         m = SCTP_HEADER_TO_CHAIN(i_pak);
6098 #ifdef SCTP_MBUF_LOGGING
6099         /* Log in any input mbufs */
6100         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6101                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6102         }
6103 #endif
6104 #ifdef SCTP_PACKET_LOGGING
6105         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6106                 sctp_packet_log(m);
6107         }
6108 #endif
6109         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6110             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6111             m->m_pkthdr.len,
6112             if_name(m->m_pkthdr.rcvif),
6113             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6114         mflowid = m->m_pkthdr.flowid;
6115         mflowtype = M_HASHTYPE_GET(m);
6116         fibnum = M_GETFIB(m);
6117         SCTP_STAT_INCR(sctps_recvpackets);
6118         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6119         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6120         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6121         if (SCTP_BUF_LEN(m) < offset) {
6122                 if ((m = m_pullup(m, offset)) == NULL) {
6123                         SCTP_STAT_INCR(sctps_hdrops);
6124                         return;
6125                 }
6126         }
6127         ip = mtod(m, struct ip *);
6128         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6129         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6130         offset -= sizeof(struct sctp_chunkhdr);
6131         memset(&src, 0, sizeof(struct sockaddr_in));
6132         src.sin_family = AF_INET;
6133         src.sin_len = sizeof(struct sockaddr_in);
6134         src.sin_port = sh->src_port;
6135         src.sin_addr = ip->ip_src;
6136         memset(&dst, 0, sizeof(struct sockaddr_in));
6137         dst.sin_family = AF_INET;
6138         dst.sin_len = sizeof(struct sockaddr_in);
6139         dst.sin_port = sh->dest_port;
6140         dst.sin_addr = ip->ip_dst;
6141         length = ntohs(ip->ip_len);
6142         /* Validate mbuf chain length with IP payload length. */
6143         if (SCTP_HEADER_LEN(m) != length) {
6144                 SCTPDBG(SCTP_DEBUG_INPUT1,
6145                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6146                 SCTP_STAT_INCR(sctps_hdrops);
6147                 goto out;
6148         }
6149         /* SCTP does not allow broadcasts or multicasts */
6150         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6151                 goto out;
6152         }
6153         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6154                 goto out;
6155         }
6156         ecn_bits = ip->ip_tos;
6157 #if defined(SCTP_WITH_NO_CSUM)
6158         SCTP_STAT_INCR(sctps_recvnocrc);
6159 #else
6160         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6161                 SCTP_STAT_INCR(sctps_recvhwcrc);
6162                 compute_crc = 0;
6163         } else {
6164                 SCTP_STAT_INCR(sctps_recvswcrc);
6165                 compute_crc = 1;
6166         }
6167 #endif
6168         sctp_common_input_processing(&m, iphlen, offset, length,
6169             (struct sockaddr *)&src,
6170             (struct sockaddr *)&dst,
6171             sh, ch,
6172 #if !defined(SCTP_WITH_NO_CSUM)
6173             compute_crc,
6174 #endif
6175             ecn_bits,
6176             mflowtype, mflowid, fibnum,
6177             vrf_id, port);
6178 out:
6179         if (m) {
6180                 sctp_m_freem(m);
6181         }
6182         return;
6183 }
6184
6185 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6186 extern int *sctp_cpuarry;
6187
6188 #endif
6189
6190 int
6191 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6192 {
6193         struct mbuf *m;
6194         int off;
6195
6196         m = *mp;
6197         off = *offp;
6198 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6199         if (mp_ncpus > 1) {
6200                 struct ip *ip;
6201                 struct sctphdr *sh;
6202                 int offset;
6203                 int cpu_to_use;
6204                 uint32_t flowid, tag;
6205
6206                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6207                         flowid = m->m_pkthdr.flowid;
6208                 } else {
6209                         /*
6210                          * No flow id built by lower layers fix it so we
6211                          * create one.
6212                          */
6213                         offset = off + sizeof(struct sctphdr);
6214                         if (SCTP_BUF_LEN(m) < offset) {
6215                                 if ((m = m_pullup(m, offset)) == NULL) {
6216                                         SCTP_STAT_INCR(sctps_hdrops);
6217                                         return (IPPROTO_DONE);
6218                                 }
6219                         }
6220                         ip = mtod(m, struct ip *);
6221                         sh = (struct sctphdr *)((caddr_t)ip + off);
6222                         tag = htonl(sh->v_tag);
6223                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6224                         m->m_pkthdr.flowid = flowid;
6225                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6226                 }
6227                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6228                 sctp_queue_to_mcore(m, off, cpu_to_use);
6229                 return (IPPROTO_DONE);
6230         }
6231 #endif
6232         sctp_input_with_port(m, off, 0);
6233         return (IPPROTO_DONE);
6234 }
6235
6236 #endif