sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_input.h>
  44 #include <netinet/sctp_auth.h>
  45 #include <netinet/sctp_indata.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctp_bsd_addr.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_crc32.h>
  50 #if defined(INET) || defined(INET6)
  51 #include <netinet/udp.h>
  52 #endif
  53 #include <sys/smp.h>
  54
  55
  56
  57 static void
  58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  59 {
  60         struct sctp_nets *net;
  61
  62         /*
  63          * This now not only stops all cookie timers it also stops any INIT
  64          * timers as well. This will make sure that the timers are stopped
  65          * in all collision cases.
  66          */
  67         SCTP_TCB_LOCK_ASSERT(stcb);
  68         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  69                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  70                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  71                             stcb->sctp_ep,
  72                             stcb,
  73                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  74                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  75                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  76                             stcb->sctp_ep,
  77                             stcb,
  78                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  79                 }
  80         }
  81 }
  82
  83 /* INIT handler */
  84 static void
  85 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  86     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  87     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  88     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  89     uint8_t mflowtype, uint32_t mflowid,
  90     uint32_t vrf_id, uint16_t port)
  91 {
  92         struct sctp_init *init;
  93         struct mbuf *op_err;
  94
  95         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  96             (void *)stcb);
  97         if (stcb == NULL) {
  98                 SCTP_INP_RLOCK(inp);
  99         }
 100         /* validate length */
 101         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 102                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 103                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 104                     mflowtype, mflowid,
 105                     vrf_id, port);
 106                 if (stcb)
 107                         *abort_no_unlock = 1;
 108                 goto outnow;
 109         }
 110         /* validate parameters */
 111         init = &cp->init;
 112         if (init->initiate_tag == 0) {
 113                 /* protocol error... send abort */
 114                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 115                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 116                     mflowtype, mflowid,
 117                     vrf_id, port);
 118                 if (stcb)
 119                         *abort_no_unlock = 1;
 120                 goto outnow;
 121         }
 122         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 123                 /* invalid parameter... send abort */
 124                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 125                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 126                     mflowtype, mflowid,
 127                     vrf_id, port);
 128                 if (stcb)
 129                         *abort_no_unlock = 1;
 130                 goto outnow;
 131         }
 132         if (init->num_inbound_streams == 0) {
 133                 /* protocol error... send abort */
 134                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 135                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 136                     mflowtype, mflowid,
 137                     vrf_id, port);
 138                 if (stcb)
 139                         *abort_no_unlock = 1;
 140                 goto outnow;
 141         }
 142         if (init->num_outbound_streams == 0) {
 143                 /* protocol error... send abort */
 144                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 145                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 146                     mflowtype, mflowid,
 147                     vrf_id, port);
 148                 if (stcb)
 149                         *abort_no_unlock = 1;
 150                 goto outnow;
 151         }
 152         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 153             offset + ntohs(cp->ch.chunk_length))) {
 154                 /* auth parameter(s) error... send abort */
 155                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 156                     "Problem with AUTH parameters");
 157                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 158                     mflowtype, mflowid,
 159                     vrf_id, port);
 160                 if (stcb)
 161                         *abort_no_unlock = 1;
 162                 goto outnow;
 163         }
 164         /*
 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, net, m, iphlen, offset,
 202                     src, dst, 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         if (asoc->strmout) {
 369                 for (i = 0; i < asoc->streamoutcnt; i++) {
 370                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 371                 }
 372         }
 373         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 374         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 375         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 376                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 377         }
 378         /* This is the next one we expect */
 379         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 380
 381         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 382         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 383
 384         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 385         /* open the requested streams */
 386
 387         if (asoc->strmin != NULL) {
 388                 /* Free the old ones */
 389                 struct sctp_queued_to_read *ctl, *nctl;
 390
 391                 for (i = 0; i < asoc->streamincnt; i++) {
 392                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 393                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 394                                 sctp_free_remote_addr(ctl->whoFrom);
 395                                 ctl->whoFrom = NULL;
 396                                 sctp_m_freem(ctl->data);
 397                                 ctl->data = NULL;
 398                                 sctp_free_a_readq(stcb, ctl);
 399                         }
 400                 }
 401                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 402         }
 403         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 404                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 405         } else {
 406                 asoc->streamincnt = asoc->max_inbound_streams;
 407         }
 408         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 409             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 410         if (asoc->strmin == NULL) {
 411                 /* we didn't get memory for the streams! */
 412                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 413                 return (-1);
 414         }
 415         for (i = 0; i < asoc->streamincnt; i++) {
 416                 asoc->strmin[i].stream_no = i;
 417                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 418                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 419                 asoc->strmin[i].delivery_started = 0;
 420         }
 421         /*
 422          * load_address_from_init will put the addresses into the
 423          * association when the COOKIE is processed or the INIT-ACK is
 424          * processed. Both types of COOKIE's existing and new call this
 425          * routine. It will remove addresses that are no longer in the
 426          * association (for the restarting case where addresses are
 427          * removed). Up front when the INIT arrives we will discard it if it
 428          * is a restart and new addresses have been added.
 429          */
 430         /* sa_ignore MEMLEAK */
 431         return (0);
 432 }
 433
 434 /*
 435  * INIT-ACK message processing/consumption returns value < 0 on error
 436  */
 437 static int
 438 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 439     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 440     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 441     struct sctp_nets *net, int *abort_no_unlock,
 442     uint8_t mflowtype, uint32_t mflowid,
 443     uint32_t vrf_id)
 444 {
 445         struct sctp_association *asoc;
 446         struct mbuf *op_err;
 447         int retval, abort_flag;
 448         uint32_t initack_limit;
 449         int nat_friendly = 0;
 450
 451         /* First verify that we have no illegal param's */
 452         abort_flag = 0;
 453
 454         op_err = sctp_arethere_unrecognized_parameters(m,
 455             (offset + sizeof(struct sctp_init_chunk)),
 456             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 457         if (abort_flag) {
 458                 /* Send an abort and notify peer */
 459                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 460                 *abort_no_unlock = 1;
 461                 return (-1);
 462         }
 463         asoc = &stcb->asoc;
 464         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 465         /* process the peer's parameters in the INIT-ACK */
 466         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 467         if (retval < 0) {
 468                 return (retval);
 469         }
 470         initack_limit = offset + ntohs(cp->ch.chunk_length);
 471         /* load all addresses */
 472         if ((retval = sctp_load_addresses_from_init(stcb, m,
 473             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 474             src, dst, NULL))) {
 475                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 476                     "Problem with address parameters");
 477                 SCTPDBG(SCTP_DEBUG_INPUT1,
 478                     "Load addresses from INIT causes an abort %d\n",
 479                     retval);
 480                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 481                     src, dst, sh, op_err,
 482                     mflowtype, mflowid,
 483                     vrf_id, net->port);
 484                 *abort_no_unlock = 1;
 485                 return (-1);
 486         }
 487         /* if the peer doesn't support asconf, flush the asconf queue */
 488         if (asoc->asconf_supported == 0) {
 489                 struct sctp_asconf_addr *param, *nparam;
 490
 491                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 492                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 493                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 494                 }
 495         }
 496         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 497             stcb->asoc.local_hmacs);
 498         if (op_err) {
 499                 sctp_queue_op_err(stcb, op_err);
 500                 /* queuing will steal away the mbuf chain to the out queue */
 501                 op_err = NULL;
 502         }
 503         /* extract the cookie and queue it to "echo" it back... */
 504         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 505                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 506                     stcb->asoc.overall_error_count,
 507                     0,
 508                     SCTP_FROM_SCTP_INPUT,
 509                     __LINE__);
 510         }
 511         stcb->asoc.overall_error_count = 0;
 512         net->error_count = 0;
 513
 514         /*
 515          * Cancel the INIT timer, We do this first before queueing the
 516          * cookie. We always cancel at the primary to assue that we are
 517          * canceling the timer started by the INIT which always goes to the
 518          * primary.
 519          */
 520         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 521             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 522
 523         /* calculate the RTO */
 524         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 525             SCTP_RTT_FROM_NON_DATA);
 526         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 527         if (retval < 0) {
 528                 /*
 529                  * No cookie, we probably should send a op error. But in any
 530                  * case if there is no cookie in the INIT-ACK, we can
 531                  * abandon the peer, its broke.
 532                  */
 533                 if (retval == -3) {
 534                         uint16_t len;
 535
 536                         len = (uint16_t) (sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 537                         /* We abort with an error of missing mandatory param */
 538                         op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 539                         if (op_err != NULL) {
 540                                 struct sctp_error_missing_param *cause;
 541
 542                                 SCTP_BUF_LEN(op_err) = len;
 543                                 cause = mtod(op_err, struct sctp_error_missing_param *);
 544                                 /* Subtract the reserved param */
 545                                 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 546                                 cause->cause.length = htons(len);
 547                                 cause->num_missing_params = htonl(1);
 548                                 cause->type[0] = htons(SCTP_STATE_COOKIE);
 549                         }
 550                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 551                             src, dst, sh, op_err,
 552                             mflowtype, mflowid,
 553                             vrf_id, net->port);
 554                         *abort_no_unlock = 1;
 555                 }
 556                 return (retval);
 557         }
 558         return (0);
 559 }
 560
 561 static void
 562 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 563     struct sctp_tcb *stcb, struct sctp_nets *net)
 564 {
 565         union sctp_sockstore store;
 566         struct sctp_nets *r_net, *f_net;
 567         struct timeval tv;
 568         int req_prim = 0;
 569         uint16_t old_error_counter;
 570
 571         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 572                 /* Invalid length */
 573                 return;
 574         }
 575         memset(&store, 0, sizeof(store));
 576         switch (cp->heartbeat.hb_info.addr_family) {
 577 #ifdef INET
 578         case AF_INET:
 579                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 580                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 581                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 582                         store.sin.sin_port = stcb->rport;
 583                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 584                             sizeof(store.sin.sin_addr));
 585                 } else {
 586                         return;
 587                 }
 588                 break;
 589 #endif
 590 #ifdef INET6
 591         case AF_INET6:
 592                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 593                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 594                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 595                         store.sin6.sin6_port = stcb->rport;
 596                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 597                 } else {
 598                         return;
 599                 }
 600                 break;
 601 #endif
 602         default:
 603                 return;
 604         }
 605         r_net = sctp_findnet(stcb, &store.sa);
 606         if (r_net == NULL) {
 607                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 608                 return;
 609         }
 610         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 611             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 612             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 613                 /*
 614                  * If the its a HB and it's random value is correct when can
 615                  * confirm the destination.
 616                  */
 617                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 618                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 619                         stcb->asoc.primary_destination = r_net;
 620                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 621                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 622                         if (f_net != r_net) {
 623                                 /*
 624                                  * first one on the list is NOT the primary
 625                                  * sctp_cmpaddr() is much more efficent if
 626                                  * the primary is the first on the list,
 627                                  * make it so.
 628                                  */
 629                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 630                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 631                         }
 632                         req_prim = 1;
 633                 }
 634                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 635                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 636                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 637                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 638                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 639         }
 640         old_error_counter = r_net->error_count;
 641         r_net->error_count = 0;
 642         r_net->hb_responded = 1;
 643         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 644         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 645         /* Now lets do a RTO with this */
 646         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 647             SCTP_RTT_FROM_NON_DATA);
 648         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 649                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 650                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 651                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 652         }
 653         if (r_net->dest_state & SCTP_ADDR_PF) {
 654                 r_net->dest_state &= ~SCTP_ADDR_PF;
 655                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 656         }
 657         if (old_error_counter > 0) {
 658                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 659                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 660                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 661         }
 662         if (r_net == stcb->asoc.primary_destination) {
 663                 if (stcb->asoc.alternate) {
 664                         /* release the alternate, primary is good */
 665                         sctp_free_remote_addr(stcb->asoc.alternate);
 666                         stcb->asoc.alternate = NULL;
 667                 }
 668         }
 669         /* Mobility adaptation */
 670         if (req_prim) {
 671                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 672                     SCTP_MOBILITY_BASE) ||
 673                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 674                     SCTP_MOBILITY_FASTHANDOFF)) &&
 675                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 676                     SCTP_MOBILITY_PRIM_DELETED)) {
 677
 678                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 679                             stcb->sctp_ep, stcb, NULL,
 680                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 681                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 682                             SCTP_MOBILITY_FASTHANDOFF)) {
 683                                 sctp_assoc_immediate_retrans(stcb,
 684                                     stcb->asoc.primary_destination);
 685                         }
 686                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 687                             SCTP_MOBILITY_BASE)) {
 688                                 sctp_move_chunks_from_net(stcb,
 689                                     stcb->asoc.deleted_primary);
 690                         }
 691                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 692                             stcb->asoc.deleted_primary);
 693                 }
 694         }
 695 }
 696
 697 static int
 698 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 699 {
 700         /*
 701          * return 0 means we want you to proceed with the abort non-zero
 702          * means no abort processing
 703          */
 704         struct sctpasochead *head;
 705
 706         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 707                 /* generate a new vtag and send init */
 708                 LIST_REMOVE(stcb, sctp_asocs);
 709                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 710                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 711                 /*
 712                  * put it in the bucket in the vtag hash of assoc's for the
 713                  * system
 714                  */
 715                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 716                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 717                 return (1);
 718         }
 719         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 720                 /*
 721                  * treat like a case where the cookie expired i.e.: - dump
 722                  * current cookie. - generate a new vtag. - resend init.
 723                  */
 724                 /* generate a new vtag and send init */
 725                 LIST_REMOVE(stcb, sctp_asocs);
 726                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 727                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 728                 sctp_stop_all_cookie_timers(stcb);
 729                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 730                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 731                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 732                 /*
 733                  * put it in the bucket in the vtag hash of assoc's for the
 734                  * system
 735                  */
 736                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 737                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 738                 return (1);
 739         }
 740         return (0);
 741 }
 742
 743 static int
 744 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 745     struct sctp_nets *net)
 746 {
 747         /*
 748          * return 0 means we want you to proceed with the abort non-zero
 749          * means no abort processing
 750          */
 751         if (stcb->asoc.auth_supported == 0) {
 752                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 753                 return (0);
 754         }
 755         sctp_asconf_send_nat_state_update(stcb, net);
 756         return (1);
 757 }
 758
 759
 760 static void
 761 sctp_handle_abort(struct sctp_abort_chunk *abort,
 762     struct sctp_tcb *stcb, struct sctp_nets *net)
 763 {
 764 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 765         struct socket *so;
 766
 767 #endif
 768         uint16_t len;
 769         uint16_t error;
 770
 771         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 772         if (stcb == NULL)
 773                 return;
 774
 775         len = ntohs(abort->ch.chunk_length);
 776         if (len > sizeof(struct sctp_chunkhdr)) {
 777                 /*
 778                  * Need to check the cause codes for our two magic nat
 779                  * aborts which don't kill the assoc necessarily.
 780                  */
 781                 struct sctp_gen_error_cause *cause;
 782
 783                 cause = (struct sctp_gen_error_cause *)(abort + 1);
 784                 error = ntohs(cause->code);
 785                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 786                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 787                             abort->ch.chunk_flags);
 788                         if (sctp_handle_nat_colliding_state(stcb)) {
 789                                 return;
 790                         }
 791                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 792                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 793                             abort->ch.chunk_flags);
 794                         if (sctp_handle_nat_missing_state(stcb, net)) {
 795                                 return;
 796                         }
 797                 }
 798         } else {
 799                 error = 0;
 800         }
 801         /* stop any receive timers */
 802         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 803             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 804         /* notify user of the abort and clean up... */
 805         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 806         /* free the tcb */
 807         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 808         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 809             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 810                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 811         }
 812 #ifdef SCTP_ASOCLOG_OF_TSNS
 813         sctp_print_out_track_log(stcb);
 814 #endif
 815 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 816         so = SCTP_INP_SO(stcb->sctp_ep);
 817         atomic_add_int(&stcb->asoc.refcnt, 1);
 818         SCTP_TCB_UNLOCK(stcb);
 819         SCTP_SOCKET_LOCK(so, 1);
 820         SCTP_TCB_LOCK(stcb);
 821         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 822 #endif
 823         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 824         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 825             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 826 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 827         SCTP_SOCKET_UNLOCK(so, 1);
 828 #endif
 829         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 830 }
 831
 832 static void
 833 sctp_start_net_timers(struct sctp_tcb *stcb)
 834 {
 835         uint32_t cnt_hb_sent;
 836         struct sctp_nets *net;
 837
 838         cnt_hb_sent = 0;
 839         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 840                 /*
 841                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 842                  * If the dest in unconfirmed send a hb as well if under
 843                  * max_hb_burst have been sent.
 844                  */
 845                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 846                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 847                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 848                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 849                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 850                         cnt_hb_sent++;
 851                 }
 852         }
 853         if (cnt_hb_sent) {
 854                 sctp_chunk_output(stcb->sctp_ep, stcb,
 855                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 856                     SCTP_SO_NOT_LOCKED);
 857         }
 858 }
 859
 860
 861 static void
 862 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 863     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 864 {
 865         struct sctp_association *asoc;
 866         int some_on_streamwheel;
 867         int old_state;
 868
 869 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 870         struct socket *so;
 871
 872 #endif
 873
 874         SCTPDBG(SCTP_DEBUG_INPUT2,
 875             "sctp_handle_shutdown: handling SHUTDOWN\n");
 876         if (stcb == NULL)
 877                 return;
 878         asoc = &stcb->asoc;
 879         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 880             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 881                 return;
 882         }
 883         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 884                 /* Shutdown NOT the expected size */
 885                 return;
 886         }
 887         old_state = SCTP_GET_STATE(asoc);
 888         sctp_update_acked(stcb, cp, abort_flag);
 889         if (*abort_flag) {
 890                 return;
 891         }
 892         if (asoc->control_pdapi) {
 893                 /*
 894                  * With a normal shutdown we assume the end of last record.
 895                  */
 896                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 897                 asoc->control_pdapi->end_added = 1;
 898                 asoc->control_pdapi->pdapi_aborted = 1;
 899                 asoc->control_pdapi = NULL;
 900                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 901 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 902                 so = SCTP_INP_SO(stcb->sctp_ep);
 903                 atomic_add_int(&stcb->asoc.refcnt, 1);
 904                 SCTP_TCB_UNLOCK(stcb);
 905                 SCTP_SOCKET_LOCK(so, 1);
 906                 SCTP_TCB_LOCK(stcb);
 907                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 908                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 909                         /* assoc was freed while we were unlocked */
 910                         SCTP_SOCKET_UNLOCK(so, 1);
 911                         return;
 912                 }
 913 #endif
 914                 if (stcb->sctp_socket) {
 915                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 916                 }
 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_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 963                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 964                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 965                         sctp_stop_timers_for_shutdown(stcb);
 966                         sctp_send_shutdown_ack(stcb, net);
 967                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 968                             stcb->sctp_ep, stcb, net);
 969                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 970                         sctp_send_shutdown_ack(stcb, net);
 971                 }
 972         }
 973 }
 974
 975 static void
 976 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 977     struct sctp_tcb *stcb,
 978     struct sctp_nets *net)
 979 {
 980         struct sctp_association *asoc;
 981
 982 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 983         struct socket *so;
 984
 985         so = SCTP_INP_SO(stcb->sctp_ep);
 986 #endif
 987         SCTPDBG(SCTP_DEBUG_INPUT2,
 988             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 989         if (stcb == NULL)
 990                 return;
 991
 992         asoc = &stcb->asoc;
 993         /* process according to association state */
 994         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 995             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 996                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 997                 sctp_send_shutdown_complete(stcb, net, 1);
 998                 SCTP_TCB_UNLOCK(stcb);
 999                 return;
1000         }
1001         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
1002             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1003                 /* unexpected SHUTDOWN-ACK... so ignore... */
1004                 SCTP_TCB_UNLOCK(stcb);
1005                 return;
1006         }
1007         if (asoc->control_pdapi) {
1008                 /*
1009                  * With a normal shutdown we assume the end of last record.
1010                  */
1011                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1012                 asoc->control_pdapi->end_added = 1;
1013                 asoc->control_pdapi->pdapi_aborted = 1;
1014                 asoc->control_pdapi = NULL;
1015                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1016 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1017                 atomic_add_int(&stcb->asoc.refcnt, 1);
1018                 SCTP_TCB_UNLOCK(stcb);
1019                 SCTP_SOCKET_LOCK(so, 1);
1020                 SCTP_TCB_LOCK(stcb);
1021                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1022                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1023                         /* assoc was freed while we were unlocked */
1024                         SCTP_SOCKET_UNLOCK(so, 1);
1025                         return;
1026                 }
1027 #endif
1028                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1029 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1030                 SCTP_SOCKET_UNLOCK(so, 1);
1031 #endif
1032         }
1033 #ifdef INVARIANTS
1034         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1035             !TAILQ_EMPTY(&asoc->sent_queue) ||
1036             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1037                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1038         }
1039 #endif
1040         /* stop the timer */
1041         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1042             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1043         /* send SHUTDOWN-COMPLETE */
1044         sctp_send_shutdown_complete(stcb, net, 0);
1045         /* notify upper layer protocol */
1046         if (stcb->sctp_socket) {
1047                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1048                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1049                         stcb->sctp_socket->so_snd.sb_cc = 0;
1050                 }
1051                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1052         }
1053         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1054         /* free the TCB but first save off the ep */
1055 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1056         atomic_add_int(&stcb->asoc.refcnt, 1);
1057         SCTP_TCB_UNLOCK(stcb);
1058         SCTP_SOCKET_LOCK(so, 1);
1059         SCTP_TCB_LOCK(stcb);
1060         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1061 #endif
1062         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1063             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1064 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1065         SCTP_SOCKET_UNLOCK(so, 1);
1066 #endif
1067 }
1068
1069 /*
1070  * Skip past the param header and then we will find the chunk that caused the
1071  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1072  * our peer must be broken.
1073  */
1074 static void
1075 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1076     struct sctp_nets *net)
1077 {
1078         struct sctp_chunkhdr *chk;
1079
1080         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1081         switch (chk->chunk_type) {
1082         case SCTP_ASCONF_ACK:
1083         case SCTP_ASCONF:
1084                 sctp_asconf_cleanup(stcb, net);
1085                 break;
1086         case SCTP_FORWARD_CUM_TSN:
1087                 stcb->asoc.prsctp_supported = 0;
1088                 break;
1089         default:
1090                 SCTPDBG(SCTP_DEBUG_INPUT2,
1091                     "Peer does not support chunk type %d(%x)??\n",
1092                     chk->chunk_type, (uint32_t) chk->chunk_type);
1093                 break;
1094         }
1095 }
1096
1097 /*
1098  * Skip past the param header and then we will find the param that caused the
1099  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1100  * these will turn of specific features.
1101  * XXX: Is this the right thing to do?
1102  */
1103 static void
1104 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1105 {
1106         struct sctp_paramhdr *pbad;
1107
1108         pbad = phdr + 1;
1109         switch (ntohs(pbad->param_type)) {
1110                 /* pr-sctp draft */
1111         case SCTP_PRSCTP_SUPPORTED:
1112                 stcb->asoc.prsctp_supported = 0;
1113                 break;
1114         case SCTP_SUPPORTED_CHUNK_EXT:
1115                 break;
1116                 /* draft-ietf-tsvwg-addip-sctp */
1117         case SCTP_HAS_NAT_SUPPORT:
1118                 stcb->asoc.peer_supports_nat = 0;
1119                 break;
1120         case SCTP_ADD_IP_ADDRESS:
1121         case SCTP_DEL_IP_ADDRESS:
1122         case SCTP_SET_PRIM_ADDR:
1123                 stcb->asoc.asconf_supported = 0;
1124                 break;
1125         case SCTP_SUCCESS_REPORT:
1126         case SCTP_ERROR_CAUSE_IND:
1127                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1128                 SCTPDBG(SCTP_DEBUG_INPUT2,
1129                     "Turning off ASCONF to this strange peer\n");
1130                 stcb->asoc.asconf_supported = 0;
1131                 break;
1132         default:
1133                 SCTPDBG(SCTP_DEBUG_INPUT2,
1134                     "Peer does not support param type %d(%x)??\n",
1135                     pbad->param_type, (uint32_t) pbad->param_type);
1136                 break;
1137         }
1138 }
1139
1140 static int
1141 sctp_handle_error(struct sctp_chunkhdr *ch,
1142     struct sctp_tcb *stcb, struct sctp_nets *net)
1143 {
1144         int chklen;
1145         struct sctp_paramhdr *phdr;
1146         uint16_t error, error_type;
1147         uint16_t error_len;
1148         struct sctp_association *asoc;
1149         int adjust;
1150
1151 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1152         struct socket *so;
1153
1154 #endif
1155
1156         /* parse through all of the errors and process */
1157         asoc = &stcb->asoc;
1158         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1159             sizeof(struct sctp_chunkhdr));
1160         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1161         error = 0;
1162         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1163                 /* Process an Error Cause */
1164                 error_type = ntohs(phdr->param_type);
1165                 error_len = ntohs(phdr->param_length);
1166                 if ((error_len > chklen) || (error_len == 0)) {
1167                         /* invalid param length for this param */
1168                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1169                             chklen, error_len);
1170                         return (0);
1171                 }
1172                 if (error == 0) {
1173                         /* report the first error cause */
1174                         error = error_type;
1175                 }
1176                 switch (error_type) {
1177                 case SCTP_CAUSE_INVALID_STREAM:
1178                 case SCTP_CAUSE_MISSING_PARAM:
1179                 case SCTP_CAUSE_INVALID_PARAM:
1180                 case SCTP_CAUSE_NO_USER_DATA:
1181                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1182                             error_type);
1183                         break;
1184                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1185                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1186                             ch->chunk_flags);
1187                         if (sctp_handle_nat_colliding_state(stcb)) {
1188                                 return (0);
1189                         }
1190                         break;
1191                 case SCTP_CAUSE_NAT_MISSING_STATE:
1192                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1193                             ch->chunk_flags);
1194                         if (sctp_handle_nat_missing_state(stcb, net)) {
1195                                 return (0);
1196                         }
1197                         break;
1198                 case SCTP_CAUSE_STALE_COOKIE:
1199                         /*
1200                          * We only act if we have echoed a cookie and are
1201                          * waiting.
1202                          */
1203                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1204                                 int *p;
1205
1206                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1207                                 /* Save the time doubled */
1208                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1209                                 asoc->stale_cookie_count++;
1210                                 if (asoc->stale_cookie_count >
1211                                     asoc->max_init_times) {
1212                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1213                                         /* now free the asoc */
1214 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1215                                         so = SCTP_INP_SO(stcb->sctp_ep);
1216                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1217                                         SCTP_TCB_UNLOCK(stcb);
1218                                         SCTP_SOCKET_LOCK(so, 1);
1219                                         SCTP_TCB_LOCK(stcb);
1220                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1221 #endif
1222                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1223                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1224 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1225                                         SCTP_SOCKET_UNLOCK(so, 1);
1226 #endif
1227                                         return (-1);
1228                                 }
1229                                 /* blast back to INIT state */
1230                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1231                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1232                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1233                                 sctp_stop_all_cookie_timers(stcb);
1234                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1235                         }
1236                         break;
1237                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1238                         /*
1239                          * Nothing we can do here, we don't do hostname
1240                          * addresses so if the peer does not like my IPv6
1241                          * (or IPv4 for that matter) it does not matter. If
1242                          * they don't support that type of address, they can
1243                          * NOT possibly get that packet type... i.e. with no
1244                          * IPv6 you can't recieve a IPv6 packet. so we can
1245                          * safely ignore this one. If we ever added support
1246                          * for HOSTNAME Addresses, then we would need to do
1247                          * something here.
1248                          */
1249                         break;
1250                 case SCTP_CAUSE_UNRECOG_CHUNK:
1251                         sctp_process_unrecog_chunk(stcb, phdr, net);
1252                         break;
1253                 case SCTP_CAUSE_UNRECOG_PARAM:
1254                         sctp_process_unrecog_param(stcb, phdr);
1255                         break;
1256                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1257                         /*
1258                          * We ignore this since the timer will drive out a
1259                          * new cookie anyway and there timer will drive us
1260                          * to send a SHUTDOWN_COMPLETE. We can't send one
1261                          * here since we don't have their tag.
1262                          */
1263                         break;
1264                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1265                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1266                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1267                         /*
1268                          * We should NOT get these here, but in a
1269                          * ASCONF-ACK.
1270                          */
1271                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1272                             error_type);
1273                         break;
1274                 case SCTP_CAUSE_OUT_OF_RESC:
1275                         /*
1276                          * And what, pray tell do we do with the fact that
1277                          * the peer is out of resources? Not really sure we
1278                          * could do anything but abort. I suspect this
1279                          * should have came WITH an abort instead of in a
1280                          * OP-ERROR.
1281                          */
1282                         break;
1283                 default:
1284                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1285                             error_type);
1286                         break;
1287                 }
1288                 adjust = SCTP_SIZE32(error_len);
1289                 chklen -= adjust;
1290                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1291         }
1292         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1293         return (0);
1294 }
1295
1296 static int
1297 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1298     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1299     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1300     struct sctp_nets *net, int *abort_no_unlock,
1301     uint8_t mflowtype, uint32_t mflowid,
1302     uint32_t vrf_id)
1303 {
1304         struct sctp_init_ack *init_ack;
1305         struct mbuf *op_err;
1306
1307         SCTPDBG(SCTP_DEBUG_INPUT2,
1308             "sctp_handle_init_ack: handling INIT-ACK\n");
1309
1310         if (stcb == NULL) {
1311                 SCTPDBG(SCTP_DEBUG_INPUT2,
1312                     "sctp_handle_init_ack: TCB is null\n");
1313                 return (-1);
1314         }
1315         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1316                 /* Invalid length */
1317                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1318                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1319                     src, dst, sh, op_err,
1320                     mflowtype, mflowid,
1321                     vrf_id, net->port);
1322                 *abort_no_unlock = 1;
1323                 return (-1);
1324         }
1325         init_ack = &cp->init;
1326         /* validate parameters */
1327         if (init_ack->initiate_tag == 0) {
1328                 /* protocol error... send an abort */
1329                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1330                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1331                     src, dst, sh, op_err,
1332                     mflowtype, mflowid,
1333                     vrf_id, net->port);
1334                 *abort_no_unlock = 1;
1335                 return (-1);
1336         }
1337         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1338                 /* protocol error... send an abort */
1339                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1340                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1341                     src, dst, sh, op_err,
1342                     mflowtype, mflowid,
1343                     vrf_id, net->port);
1344                 *abort_no_unlock = 1;
1345                 return (-1);
1346         }
1347         if (init_ack->num_inbound_streams == 0) {
1348                 /* protocol error... send an abort */
1349                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1350                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1351                     src, dst, sh, op_err,
1352                     mflowtype, mflowid,
1353                     vrf_id, net->port);
1354                 *abort_no_unlock = 1;
1355                 return (-1);
1356         }
1357         if (init_ack->num_outbound_streams == 0) {
1358                 /* protocol error... send an abort */
1359                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1360                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1361                     src, dst, sh, op_err,
1362                     mflowtype, mflowid,
1363                     vrf_id, net->port);
1364                 *abort_no_unlock = 1;
1365                 return (-1);
1366         }
1367         /* process according to association state... */
1368         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1369         case SCTP_STATE_COOKIE_WAIT:
1370                 /* this is the expected state for this chunk */
1371                 /* process the INIT-ACK parameters */
1372                 if (stcb->asoc.primary_destination->dest_state &
1373                     SCTP_ADDR_UNCONFIRMED) {
1374                         /*
1375                          * The primary is where we sent the INIT, we can
1376                          * always consider it confirmed when the INIT-ACK is
1377                          * returned. Do this before we load addresses
1378                          * though.
1379                          */
1380                         stcb->asoc.primary_destination->dest_state &=
1381                             ~SCTP_ADDR_UNCONFIRMED;
1382                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1383                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1384                 }
1385                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1386                     net, abort_no_unlock,
1387                     mflowtype, mflowid,
1388                     vrf_id) < 0) {
1389                         /* error in parsing parameters */
1390                         return (-1);
1391                 }
1392                 /* update our state */
1393                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1394                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1395
1396                 /* reset the RTO calc */
1397                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1398                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1399                             stcb->asoc.overall_error_count,
1400                             0,
1401                             SCTP_FROM_SCTP_INPUT,
1402                             __LINE__);
1403                 }
1404                 stcb->asoc.overall_error_count = 0;
1405                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1406                 /*
1407                  * collapse the init timer back in case of a exponential
1408                  * backoff
1409                  */
1410                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1411                     stcb, net);
1412                 /*
1413                  * the send at the end of the inbound data processing will
1414                  * cause the cookie to be sent
1415                  */
1416                 break;
1417         case SCTP_STATE_SHUTDOWN_SENT:
1418                 /* incorrect state... discard */
1419                 break;
1420         case SCTP_STATE_COOKIE_ECHOED:
1421                 /* incorrect state... discard */
1422                 break;
1423         case SCTP_STATE_OPEN:
1424                 /* incorrect state... discard */
1425                 break;
1426         case SCTP_STATE_EMPTY:
1427         case SCTP_STATE_INUSE:
1428         default:
1429                 /* incorrect state... discard */
1430                 return (-1);
1431                 break;
1432         }
1433         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1434         return (0);
1435 }
1436
1437 static struct sctp_tcb *
1438 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1439     struct sockaddr *src, struct sockaddr *dst,
1440     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1441     struct sctp_inpcb *inp, struct sctp_nets **netp,
1442     struct sockaddr *init_src, int *notification,
1443     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1444     uint8_t mflowtype, uint32_t mflowid,
1445     uint32_t vrf_id, uint16_t port);
1446
1447
1448 /*
1449  * handle a state cookie for an existing association m: input packet mbuf
1450  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1451  * "split" mbuf and the cookie signature does not exist offset: offset into
1452  * mbuf to the cookie-echo chunk
1453  */
1454 static struct sctp_tcb *
1455 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1456     struct sockaddr *src, struct sockaddr *dst,
1457     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1458     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1459     struct sockaddr *init_src, int *notification,
1460     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1461     uint8_t mflowtype, uint32_t mflowid,
1462     uint32_t vrf_id, uint16_t port)
1463 {
1464         struct sctp_association *asoc;
1465         struct sctp_init_chunk *init_cp, init_buf;
1466         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1467         struct sctp_nets *net;
1468         struct mbuf *op_err;
1469         int init_offset, initack_offset, i;
1470         int retval;
1471         int spec_flag = 0;
1472         uint32_t how_indx;
1473
1474 #if defined(SCTP_DETAILED_STR_STATS)
1475         int j;
1476
1477 #endif
1478
1479         net = *netp;
1480         /* I know that the TCB is non-NULL from the caller */
1481         asoc = &stcb->asoc;
1482         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1483                 if (asoc->cookie_how[how_indx] == 0)
1484                         break;
1485         }
1486         if (how_indx < sizeof(asoc->cookie_how)) {
1487                 asoc->cookie_how[how_indx] = 1;
1488         }
1489         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1490                 /* SHUTDOWN came in after sending INIT-ACK */
1491                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1492                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1493                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1494                     mflowtype, mflowid, inp->fibnum,
1495                     vrf_id, net->port);
1496                 if (how_indx < sizeof(asoc->cookie_how))
1497                         asoc->cookie_how[how_indx] = 2;
1498                 return (NULL);
1499         }
1500         /*
1501          * find and validate the INIT chunk in the cookie (peer's info) the
1502          * INIT should start after the cookie-echo header struct (chunk
1503          * header, state cookie header struct)
1504          */
1505         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1506
1507         init_cp = (struct sctp_init_chunk *)
1508             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1509             (uint8_t *) & init_buf);
1510         if (init_cp == NULL) {
1511                 /* could not pull a INIT chunk in cookie */
1512                 return (NULL);
1513         }
1514         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1515                 return (NULL);
1516         }
1517         /*
1518          * find and validate the INIT-ACK chunk in the cookie (my info) the
1519          * INIT-ACK follows the INIT chunk
1520          */
1521         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1522         initack_cp = (struct sctp_init_ack_chunk *)
1523             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1524             (uint8_t *) & initack_buf);
1525         if (initack_cp == NULL) {
1526                 /* could not pull INIT-ACK chunk in cookie */
1527                 return (NULL);
1528         }
1529         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1530                 return (NULL);
1531         }
1532         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1533             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1534                 /*
1535                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1536                  * to get into the OPEN state
1537                  */
1538                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1539                         /*-
1540                          * Opps, this means that we somehow generated two vtag's
1541                          * the same. I.e. we did:
1542                          *  Us               Peer
1543                          *   <---INIT(tag=a)------
1544                          *   ----INIT-ACK(tag=t)-->
1545                          *   ----INIT(tag=t)------> *1
1546                          *   <---INIT-ACK(tag=a)---
1547                          *   <----CE(tag=t)------------- *2
1548                          *
1549                          * At point *1 we should be generating a different
1550                          * tag t'. Which means we would throw away the CE and send
1551                          * ours instead. Basically this is case C (throw away side).
1552                          */
1553                         if (how_indx < sizeof(asoc->cookie_how))
1554                                 asoc->cookie_how[how_indx] = 17;
1555                         return (NULL);
1556
1557                 }
1558                 switch (SCTP_GET_STATE(asoc)) {
1559                 case SCTP_STATE_COOKIE_WAIT:
1560                 case SCTP_STATE_COOKIE_ECHOED:
1561                         /*
1562                          * INIT was sent but got a COOKIE_ECHO with the
1563                          * correct tags... just accept it...but we must
1564                          * process the init so that we can make sure we have
1565                          * the right seq no's.
1566                          */
1567                         /* First we must process the INIT !! */
1568                         retval = sctp_process_init(init_cp, stcb);
1569                         if (retval < 0) {
1570                                 if (how_indx < sizeof(asoc->cookie_how))
1571                                         asoc->cookie_how[how_indx] = 3;
1572                                 return (NULL);
1573                         }
1574                         /* we have already processed the INIT so no problem */
1575                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1576                             stcb, net,
1577                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1578                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1579                             stcb, net,
1580                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1581                         /* update current state */
1582                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1583                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1584                         else
1585                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1586
1587                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1588                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1589                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1590                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1591                         }
1592                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1593                         sctp_stop_all_cookie_timers(stcb);
1594                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1595                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1596                             (inp->sctp_socket->so_qlimit == 0)
1597                             ) {
1598 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1599                                 struct socket *so;
1600
1601 #endif
1602                                 /*
1603                                  * Here is where collision would go if we
1604                                  * did a connect() and instead got a
1605                                  * init/init-ack/cookie done before the
1606                                  * init-ack came back..
1607                                  */
1608                                 stcb->sctp_ep->sctp_flags |=
1609                                     SCTP_PCB_FLAGS_CONNECTED;
1610 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1611                                 so = SCTP_INP_SO(stcb->sctp_ep);
1612                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1613                                 SCTP_TCB_UNLOCK(stcb);
1614                                 SCTP_SOCKET_LOCK(so, 1);
1615                                 SCTP_TCB_LOCK(stcb);
1616                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1617                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1618                                         SCTP_SOCKET_UNLOCK(so, 1);
1619                                         return (NULL);
1620                                 }
1621 #endif
1622                                 soisconnected(stcb->sctp_socket);
1623 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1624                                 SCTP_SOCKET_UNLOCK(so, 1);
1625 #endif
1626                         }
1627                         /* notify upper layer */
1628                         *notification = SCTP_NOTIFY_ASSOC_UP;
1629                         /*
1630                          * since we did not send a HB make sure we don't
1631                          * double things
1632                          */
1633                         net->hb_responded = 1;
1634                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1635                             &cookie->time_entered,
1636                             sctp_align_unsafe_makecopy,
1637                             SCTP_RTT_FROM_NON_DATA);
1638
1639                         if (stcb->asoc.sctp_autoclose_ticks &&
1640                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1641                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1642                                     inp, stcb, NULL);
1643                         }
1644                         break;
1645                 default:
1646                         /*
1647                          * we're in the OPEN state (or beyond), so peer must
1648                          * have simply lost the COOKIE-ACK
1649                          */
1650                         break;
1651                 }               /* end switch */
1652                 sctp_stop_all_cookie_timers(stcb);
1653                 /*
1654                  * We ignore the return code here.. not sure if we should
1655                  * somehow abort.. but we do have an existing asoc. This
1656                  * really should not fail.
1657                  */
1658                 if (sctp_load_addresses_from_init(stcb, m,
1659                     init_offset + sizeof(struct sctp_init_chunk),
1660                     initack_offset, src, dst, init_src)) {
1661                         if (how_indx < sizeof(asoc->cookie_how))
1662                                 asoc->cookie_how[how_indx] = 4;
1663                         return (NULL);
1664                 }
1665                 /* respond with a COOKIE-ACK */
1666                 sctp_toss_old_cookies(stcb, asoc);
1667                 sctp_send_cookie_ack(stcb);
1668                 if (how_indx < sizeof(asoc->cookie_how))
1669                         asoc->cookie_how[how_indx] = 5;
1670                 return (stcb);
1671         }
1672         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1673             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1674             cookie->tie_tag_my_vtag == 0 &&
1675             cookie->tie_tag_peer_vtag == 0) {
1676                 /*
1677                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1678                  */
1679                 if (how_indx < sizeof(asoc->cookie_how))
1680                         asoc->cookie_how[how_indx] = 6;
1681                 return (NULL);
1682         }
1683         /*
1684          * If nat support, and the below and stcb is established, send back
1685          * a ABORT(colliding state) if we are established.
1686          */
1687         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1688             (asoc->peer_supports_nat) &&
1689             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1690             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1691             (asoc->peer_vtag == 0)))) {
1692                 /*
1693                  * Special case - Peer's support nat. We may have two init's
1694                  * that we gave out the same tag on since one was not
1695                  * established.. i.e. we get INIT from host-1 behind the nat
1696                  * and we respond tag-a, we get a INIT from host-2 behind
1697                  * the nat and we get tag-a again. Then we bring up host-1
1698                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1699                  * Now we have colliding state. We must send an abort here
1700                  * with colliding state indication.
1701                  */
1702                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1703                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1704                     mflowtype, mflowid, inp->fibnum,
1705                     vrf_id, port);
1706                 return (NULL);
1707         }
1708         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1709             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1710             (asoc->peer_vtag == 0))) {
1711                 /*
1712                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1713                  * should be ok, re-accept peer info
1714                  */
1715                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1716                         /*
1717                          * Extension of case C. If we hit this, then the
1718                          * random number generator returned the same vtag
1719                          * when we first sent our INIT-ACK and when we later
1720                          * sent our INIT. The side with the seq numbers that
1721                          * are different will be the one that normnally
1722                          * would have hit case C. This in effect "extends"
1723                          * our vtags in this collision case to be 64 bits.
1724                          * The same collision could occur aka you get both
1725                          * vtag and seq number the same twice in a row.. but
1726                          * is much less likely. If it did happen then we
1727                          * would proceed through and bring up the assoc.. we
1728                          * may end up with the wrong stream setup however..
1729                          * which would be bad.. but there is no way to
1730                          * tell.. until we send on a stream that does not
1731                          * exist :-)
1732                          */
1733                         if (how_indx < sizeof(asoc->cookie_how))
1734                                 asoc->cookie_how[how_indx] = 7;
1735
1736                         return (NULL);
1737                 }
1738                 if (how_indx < sizeof(asoc->cookie_how))
1739                         asoc->cookie_how[how_indx] = 8;
1740                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1741                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1742                 sctp_stop_all_cookie_timers(stcb);
1743                 /*
1744                  * since we did not send a HB make sure we don't double
1745                  * things
1746                  */
1747                 net->hb_responded = 1;
1748                 if (stcb->asoc.sctp_autoclose_ticks &&
1749                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1750                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1751                             NULL);
1752                 }
1753                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1754                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1755
1756                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1757                         /*
1758                          * Ok the peer probably discarded our data (if we
1759                          * echoed a cookie+data). So anything on the
1760                          * sent_queue should be marked for retransmit, we
1761                          * may not get something to kick us so it COULD
1762                          * still take a timeout to move these.. but it can't
1763                          * hurt to mark them.
1764                          */
1765                         struct sctp_tmit_chunk *chk;
1766
1767                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1768                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1769                                         chk->sent = SCTP_DATAGRAM_RESEND;
1770                                         sctp_flight_size_decrease(chk);
1771                                         sctp_total_flight_decrease(stcb, chk);
1772                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1773                                         spec_flag++;
1774                                 }
1775                         }
1776
1777                 }
1778                 /* process the INIT info (peer's info) */
1779                 retval = sctp_process_init(init_cp, stcb);
1780                 if (retval < 0) {
1781                         if (how_indx < sizeof(asoc->cookie_how))
1782                                 asoc->cookie_how[how_indx] = 9;
1783                         return (NULL);
1784                 }
1785                 if (sctp_load_addresses_from_init(stcb, m,
1786                     init_offset + sizeof(struct sctp_init_chunk),
1787                     initack_offset, src, dst, init_src)) {
1788                         if (how_indx < sizeof(asoc->cookie_how))
1789                                 asoc->cookie_how[how_indx] = 10;
1790                         return (NULL);
1791                 }
1792                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1793                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1794                         *notification = SCTP_NOTIFY_ASSOC_UP;
1795
1796                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1797                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1798                             (inp->sctp_socket->so_qlimit == 0)) {
1799 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1800                                 struct socket *so;
1801
1802 #endif
1803                                 stcb->sctp_ep->sctp_flags |=
1804                                     SCTP_PCB_FLAGS_CONNECTED;
1805 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1806                                 so = SCTP_INP_SO(stcb->sctp_ep);
1807                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1808                                 SCTP_TCB_UNLOCK(stcb);
1809                                 SCTP_SOCKET_LOCK(so, 1);
1810                                 SCTP_TCB_LOCK(stcb);
1811                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1812                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1813                                         SCTP_SOCKET_UNLOCK(so, 1);
1814                                         return (NULL);
1815                                 }
1816 #endif
1817                                 soisconnected(stcb->sctp_socket);
1818 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1819                                 SCTP_SOCKET_UNLOCK(so, 1);
1820 #endif
1821                         }
1822                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1823                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1824                         else
1825                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1826                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1827                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1828                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1829                 } else {
1830                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1831                 }
1832                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1833                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1834                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1835                             stcb->sctp_ep, stcb, asoc->primary_destination);
1836                 }
1837                 sctp_stop_all_cookie_timers(stcb);
1838                 sctp_toss_old_cookies(stcb, asoc);
1839                 sctp_send_cookie_ack(stcb);
1840                 if (spec_flag) {
1841                         /*
1842                          * only if we have retrans set do we do this. What
1843                          * this call does is get only the COOKIE-ACK out and
1844                          * then when we return the normal call to
1845                          * sctp_chunk_output will get the retrans out behind
1846                          * this.
1847                          */
1848                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1849                 }
1850                 if (how_indx < sizeof(asoc->cookie_how))
1851                         asoc->cookie_how[how_indx] = 11;
1852
1853                 return (stcb);
1854         }
1855         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1856             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1857             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1858             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1859             cookie->tie_tag_peer_vtag != 0) {
1860                 struct sctpasochead *head;
1861
1862 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1863                 struct socket *so;
1864
1865 #endif
1866
1867                 if (asoc->peer_supports_nat) {
1868                         /*
1869                          * This is a gross gross hack. Just call the
1870                          * cookie_new code since we are allowing a duplicate
1871                          * association. I hope this works...
1872                          */
1873                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1874                             sh, cookie, cookie_len,
1875                             inp, netp, init_src, notification,
1876                             auth_skipped, auth_offset, auth_len,
1877                             mflowtype, mflowid,
1878                             vrf_id, port));
1879                 }
1880                 /*
1881                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1882                  */
1883                 /* temp code */
1884                 if (how_indx < sizeof(asoc->cookie_how))
1885                         asoc->cookie_how[how_indx] = 12;
1886                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1887                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1888                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1889                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1890
1891                 /* notify upper layer */
1892                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1893                 atomic_add_int(&stcb->asoc.refcnt, 1);
1894                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1895                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1896                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1897                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1898                 }
1899                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1900                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1901                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1902                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1903                 }
1904                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1905                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1906                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1907                             stcb->sctp_ep, stcb, asoc->primary_destination);
1908
1909                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1910                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1911                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1912                 }
1913                 asoc->pre_open_streams =
1914                     ntohs(initack_cp->init.num_outbound_streams);
1915                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1916                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1917                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1918
1919                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1920
1921                 asoc->str_reset_seq_in = asoc->init_seq_number;
1922
1923                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1924                 if (asoc->mapping_array) {
1925                         memset(asoc->mapping_array, 0,
1926                             asoc->mapping_array_size);
1927                 }
1928                 if (asoc->nr_mapping_array) {
1929                         memset(asoc->nr_mapping_array, 0,
1930                             asoc->mapping_array_size);
1931                 }
1932                 SCTP_TCB_UNLOCK(stcb);
1933 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1934                 so = SCTP_INP_SO(stcb->sctp_ep);
1935                 SCTP_SOCKET_LOCK(so, 1);
1936 #endif
1937                 SCTP_INP_INFO_WLOCK();
1938                 SCTP_INP_WLOCK(stcb->sctp_ep);
1939                 SCTP_TCB_LOCK(stcb);
1940                 atomic_add_int(&stcb->asoc.refcnt, -1);
1941                 /* send up all the data */
1942                 SCTP_TCB_SEND_LOCK(stcb);
1943
1944                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1945                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1946                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1947 #if defined(SCTP_DETAILED_STR_STATS)
1948                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1949                                 asoc->strmout[i].abandoned_sent[j] = 0;
1950                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1951                         }
1952 #else
1953                         asoc->strmout[i].abandoned_sent[0] = 0;
1954                         asoc->strmout[i].abandoned_unsent[0] = 0;
1955 #endif
1956                         stcb->asoc.strmout[i].stream_no = i;
1957                         stcb->asoc.strmout[i].next_sequence_send = 0;
1958                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1959                 }
1960                 /* process the INIT-ACK info (my info) */
1961                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1962                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1963
1964                 /* pull from vtag hash */
1965                 LIST_REMOVE(stcb, sctp_asocs);
1966                 /* re-insert to new vtag position */
1967                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1968                     SCTP_BASE_INFO(hashasocmark))];
1969                 /*
1970                  * put it in the bucket in the vtag hash of assoc's for the
1971                  * system
1972                  */
1973                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1974
1975                 SCTP_TCB_SEND_UNLOCK(stcb);
1976                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1977                 SCTP_INP_INFO_WUNLOCK();
1978 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1979                 SCTP_SOCKET_UNLOCK(so, 1);
1980 #endif
1981                 asoc->total_flight = 0;
1982                 asoc->total_flight_count = 0;
1983                 /* process the INIT info (peer's info) */
1984                 retval = sctp_process_init(init_cp, stcb);
1985                 if (retval < 0) {
1986                         if (how_indx < sizeof(asoc->cookie_how))
1987                                 asoc->cookie_how[how_indx] = 13;
1988
1989                         return (NULL);
1990                 }
1991                 /*
1992                  * since we did not send a HB make sure we don't double
1993                  * things
1994                  */
1995                 net->hb_responded = 1;
1996
1997                 if (sctp_load_addresses_from_init(stcb, m,
1998                     init_offset + sizeof(struct sctp_init_chunk),
1999                     initack_offset, src, dst, init_src)) {
2000                         if (how_indx < sizeof(asoc->cookie_how))
2001                                 asoc->cookie_how[how_indx] = 14;
2002
2003                         return (NULL);
2004                 }
2005                 /* respond with a COOKIE-ACK */
2006                 sctp_stop_all_cookie_timers(stcb);
2007                 sctp_toss_old_cookies(stcb, asoc);
2008                 sctp_send_cookie_ack(stcb);
2009                 if (how_indx < sizeof(asoc->cookie_how))
2010                         asoc->cookie_how[how_indx] = 15;
2011
2012                 return (stcb);
2013         }
2014         if (how_indx < sizeof(asoc->cookie_how))
2015                 asoc->cookie_how[how_indx] = 16;
2016         /* all other cases... */
2017         return (NULL);
2018 }
2019
2020
2021 /*
2022  * handle a state cookie for a new association m: input packet mbuf chain--
2023  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2024  * and the cookie signature does not exist offset: offset into mbuf to the
2025  * cookie-echo chunk length: length of the cookie chunk to: where the init
2026  * was from returns a new TCB
2027  */
2028 static struct sctp_tcb *
2029 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2030     struct sockaddr *src, struct sockaddr *dst,
2031     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2032     struct sctp_inpcb *inp, struct sctp_nets **netp,
2033     struct sockaddr *init_src, int *notification,
2034     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2035     uint8_t mflowtype, uint32_t mflowid,
2036     uint32_t vrf_id, uint16_t port)
2037 {
2038         struct sctp_tcb *stcb;
2039         struct sctp_init_chunk *init_cp, init_buf;
2040         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2041         union sctp_sockstore store;
2042         struct sctp_association *asoc;
2043         int init_offset, initack_offset, initack_limit;
2044         int retval;
2045         int error = 0;
2046         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2047
2048 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2049         struct socket *so;
2050
2051         so = SCTP_INP_SO(inp);
2052 #endif
2053
2054         /*
2055          * find and validate the INIT chunk in the cookie (peer's info) the
2056          * INIT should start after the cookie-echo header struct (chunk
2057          * header, state cookie header struct)
2058          */
2059         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2060         init_cp = (struct sctp_init_chunk *)
2061             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2062             (uint8_t *) & init_buf);
2063         if (init_cp == NULL) {
2064                 /* could not pull a INIT chunk in cookie */
2065                 SCTPDBG(SCTP_DEBUG_INPUT1,
2066                     "process_cookie_new: could not pull INIT chunk hdr\n");
2067                 return (NULL);
2068         }
2069         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2070                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2071                 return (NULL);
2072         }
2073         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2074         /*
2075          * find and validate the INIT-ACK chunk in the cookie (my info) the
2076          * INIT-ACK follows the INIT chunk
2077          */
2078         initack_cp = (struct sctp_init_ack_chunk *)
2079             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2080             (uint8_t *) & initack_buf);
2081         if (initack_cp == NULL) {
2082                 /* could not pull INIT-ACK chunk in cookie */
2083                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2084                 return (NULL);
2085         }
2086         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2087                 return (NULL);
2088         }
2089         /*
2090          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2091          * "initack_limit" value.  This is because the chk_length field
2092          * includes the length of the cookie, but the cookie is omitted when
2093          * the INIT and INIT_ACK are tacked onto the cookie...
2094          */
2095         initack_limit = offset + cookie_len;
2096
2097         /*
2098          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2099          * and popluate
2100          */
2101
2102         /*
2103          * Here we do a trick, we set in NULL for the proc/thread argument.
2104          * We do this since in effect we only use the p argument when the
2105          * socket is unbound and we must do an implicit bind. Since we are
2106          * getting a cookie, we cannot be unbound.
2107          */
2108         stcb = sctp_aloc_assoc(inp, init_src, &error,
2109             ntohl(initack_cp->init.initiate_tag), vrf_id,
2110             ntohs(initack_cp->init.num_outbound_streams),
2111             (struct thread *)NULL
2112             );
2113         if (stcb == NULL) {
2114                 struct mbuf *op_err;
2115
2116                 /* memory problem? */
2117                 SCTPDBG(SCTP_DEBUG_INPUT1,
2118                     "process_cookie_new: no room for another TCB!\n");
2119                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2120                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2121                     src, dst, sh, op_err,
2122                     mflowtype, mflowid,
2123                     vrf_id, port);
2124                 return (NULL);
2125         }
2126         /* get the correct sctp_nets */
2127         if (netp)
2128                 *netp = sctp_findnet(stcb, init_src);
2129
2130         asoc = &stcb->asoc;
2131         /* get scope variables out of cookie */
2132         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2133         asoc->scope.site_scope = cookie->site_scope;
2134         asoc->scope.local_scope = cookie->local_scope;
2135         asoc->scope.loopback_scope = cookie->loopback_scope;
2136
2137         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2138             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2139                 struct mbuf *op_err;
2140
2141                 /*
2142                  * Houston we have a problem. The EP changed while the
2143                  * cookie was in flight. Only recourse is to abort the
2144                  * association.
2145                  */
2146                 atomic_add_int(&stcb->asoc.refcnt, 1);
2147                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2148                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2149                     src, dst, sh, op_err,
2150                     mflowtype, mflowid,
2151                     vrf_id, port);
2152 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2153                 SCTP_TCB_UNLOCK(stcb);
2154                 SCTP_SOCKET_LOCK(so, 1);
2155                 SCTP_TCB_LOCK(stcb);
2156 #endif
2157                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2158                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2159 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2160                 SCTP_SOCKET_UNLOCK(so, 1);
2161 #endif
2162                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2163                 return (NULL);
2164         }
2165         /* process the INIT-ACK info (my info) */
2166         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2167         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2168         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2169         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2170         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2171         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2172         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2173         asoc->str_reset_seq_in = asoc->init_seq_number;
2174
2175         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2176
2177         /* process the INIT info (peer's info) */
2178         if (netp)
2179                 retval = sctp_process_init(init_cp, stcb);
2180         else
2181                 retval = 0;
2182         if (retval < 0) {
2183                 atomic_add_int(&stcb->asoc.refcnt, 1);
2184 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2185                 SCTP_TCB_UNLOCK(stcb);
2186                 SCTP_SOCKET_LOCK(so, 1);
2187                 SCTP_TCB_LOCK(stcb);
2188 #endif
2189                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2190                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2191 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2192                 SCTP_SOCKET_UNLOCK(so, 1);
2193 #endif
2194                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2195                 return (NULL);
2196         }
2197         /* load all addresses */
2198         if (sctp_load_addresses_from_init(stcb, m,
2199             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2200             src, dst, init_src)) {
2201                 atomic_add_int(&stcb->asoc.refcnt, 1);
2202 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2203                 SCTP_TCB_UNLOCK(stcb);
2204                 SCTP_SOCKET_LOCK(so, 1);
2205                 SCTP_TCB_LOCK(stcb);
2206 #endif
2207                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2208                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2210                 SCTP_SOCKET_UNLOCK(so, 1);
2211 #endif
2212                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2213                 return (NULL);
2214         }
2215         /*
2216          * verify any preceding AUTH chunk that was skipped
2217          */
2218         /* pull the local authentication parameters from the cookie/init-ack */
2219         sctp_auth_get_cookie_params(stcb, m,
2220             initack_offset + sizeof(struct sctp_init_ack_chunk),
2221             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2222         if (auth_skipped) {
2223                 struct sctp_auth_chunk *auth;
2224
2225                 auth = (struct sctp_auth_chunk *)
2226                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2227                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2228                         /* auth HMAC failed, dump the assoc and packet */
2229                         SCTPDBG(SCTP_DEBUG_AUTH1,
2230                             "COOKIE-ECHO: AUTH failed\n");
2231                         atomic_add_int(&stcb->asoc.refcnt, 1);
2232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2233                         SCTP_TCB_UNLOCK(stcb);
2234                         SCTP_SOCKET_LOCK(so, 1);
2235                         SCTP_TCB_LOCK(stcb);
2236 #endif
2237                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2238                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2239 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2240                         SCTP_SOCKET_UNLOCK(so, 1);
2241 #endif
2242                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2243                         return (NULL);
2244                 } else {
2245                         /* remaining chunks checked... good to go */
2246                         stcb->asoc.authenticated = 1;
2247                 }
2248         }
2249         /* update current state */
2250         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2251         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2252         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2253                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2254                     stcb->sctp_ep, stcb, asoc->primary_destination);
2255         }
2256         sctp_stop_all_cookie_timers(stcb);
2257         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2258         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2259
2260         /*
2261          * if we're doing ASCONFs, check to see if we have any new local
2262          * addresses that need to get added to the peer (eg. addresses
2263          * changed while cookie echo in flight).  This needs to be done
2264          * after we go to the OPEN state to do the correct asconf
2265          * processing. else, make sure we have the correct addresses in our
2266          * lists
2267          */
2268
2269         /* warning, we re-use sin, sin6, sa_store here! */
2270         /* pull in local_address (our "from" address) */
2271         switch (cookie->laddr_type) {
2272 #ifdef INET
2273         case SCTP_IPV4_ADDRESS:
2274                 /* source addr is IPv4 */
2275                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2276                 store.sin.sin_family = AF_INET;
2277                 store.sin.sin_len = sizeof(struct sockaddr_in);
2278                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2279                 break;
2280 #endif
2281 #ifdef INET6
2282         case SCTP_IPV6_ADDRESS:
2283                 /* source addr is IPv6 */
2284                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2285                 store.sin6.sin6_family = AF_INET6;
2286                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2287                 store.sin6.sin6_scope_id = cookie->scope_id;
2288                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2289                 break;
2290 #endif
2291         default:
2292                 atomic_add_int(&stcb->asoc.refcnt, 1);
2293 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2294                 SCTP_TCB_UNLOCK(stcb);
2295                 SCTP_SOCKET_LOCK(so, 1);
2296                 SCTP_TCB_LOCK(stcb);
2297 #endif
2298                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2299                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2300 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2301                 SCTP_SOCKET_UNLOCK(so, 1);
2302 #endif
2303                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2304                 return (NULL);
2305         }
2306
2307         /* set up to notify upper layer */
2308         *notification = SCTP_NOTIFY_ASSOC_UP;
2309         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2310             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2311             (inp->sctp_socket->so_qlimit == 0)) {
2312                 /*
2313                  * This is an endpoint that called connect() how it got a
2314                  * cookie that is NEW is a bit of a mystery. It must be that
2315                  * the INIT was sent, but before it got there.. a complete
2316                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2317                  * should have went to the other code.. not here.. oh well..
2318                  * a bit of protection is worth having..
2319                  */
2320                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2321 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2322                 atomic_add_int(&stcb->asoc.refcnt, 1);
2323                 SCTP_TCB_UNLOCK(stcb);
2324                 SCTP_SOCKET_LOCK(so, 1);
2325                 SCTP_TCB_LOCK(stcb);
2326                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2327                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2328                         SCTP_SOCKET_UNLOCK(so, 1);
2329                         return (NULL);
2330                 }
2331 #endif
2332                 soisconnected(stcb->sctp_socket);
2333 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2334                 SCTP_SOCKET_UNLOCK(so, 1);
2335 #endif
2336         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2337             (inp->sctp_socket->so_qlimit)) {
2338                 /*
2339                  * We don't want to do anything with this one. Since it is
2340                  * the listening guy. The timer will get started for
2341                  * accepted connections in the caller.
2342                  */
2343                 ;
2344         }
2345         /* since we did not send a HB make sure we don't double things */
2346         if ((netp) && (*netp))
2347                 (*netp)->hb_responded = 1;
2348
2349         if (stcb->asoc.sctp_autoclose_ticks &&
2350             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2351                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2352         }
2353         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2354         if ((netp != NULL) && (*netp != NULL)) {
2355                 /* calculate the RTT and set the encaps port */
2356                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2357                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2358                     SCTP_RTT_FROM_NON_DATA);
2359 #if defined(INET) || defined(INET6)
2360                 if (((*netp)->port == 0) && (port != 0)) {
2361                         sctp_pathmtu_adjustment(stcb, (*netp)->mtu - sizeof(struct udphdr));
2362                 }
2363                 (*netp)->port = port;
2364 #endif
2365         }
2366         /* respond with a COOKIE-ACK */
2367         sctp_send_cookie_ack(stcb);
2368
2369         /*
2370          * check the address lists for any ASCONFs that need to be sent
2371          * AFTER the cookie-ack is sent
2372          */
2373         sctp_check_address_list(stcb, m,
2374             initack_offset + sizeof(struct sctp_init_ack_chunk),
2375             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2376             &store.sa, cookie->local_scope, cookie->site_scope,
2377             cookie->ipv4_scope, cookie->loopback_scope);
2378
2379
2380         return (stcb);
2381 }
2382
2383 /*
2384  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2385  * we NEED to make sure we are not already using the vtag. If so we
2386  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2387         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2388                                                             SCTP_BASE_INFO(hashasocmark))];
2389         LIST_FOREACH(stcb, head, sctp_asocs) {
2390                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2391                        -- SEND ABORT - TRY AGAIN --
2392                 }
2393         }
2394 */
2395
2396 /*
2397  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2398  * existing (non-NULL) TCB
2399  */
2400 static struct mbuf *
2401 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2402     struct sockaddr *src, struct sockaddr *dst,
2403     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2404     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2405     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2406     struct sctp_tcb **locked_tcb,
2407     uint8_t mflowtype, uint32_t mflowid,
2408     uint32_t vrf_id, uint16_t port)
2409 {
2410         struct sctp_state_cookie *cookie;
2411         struct sctp_tcb *l_stcb = *stcb;
2412         struct sctp_inpcb *l_inp;
2413         struct sockaddr *to;
2414         struct sctp_pcb *ep;
2415         struct mbuf *m_sig;
2416         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2417         uint8_t *sig;
2418         uint8_t cookie_ok = 0;
2419         unsigned int sig_offset, cookie_offset;
2420         unsigned int cookie_len;
2421         struct timeval now;
2422         struct timeval time_expires;
2423         int notification = 0;
2424         struct sctp_nets *netl;
2425         int had_a_existing_tcb = 0;
2426         int send_int_conf = 0;
2427
2428 #ifdef INET
2429         struct sockaddr_in sin;
2430
2431 #endif
2432 #ifdef INET6
2433         struct sockaddr_in6 sin6;
2434
2435 #endif
2436
2437         SCTPDBG(SCTP_DEBUG_INPUT2,
2438             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2439
2440         if (inp_p == NULL) {
2441                 return (NULL);
2442         }
2443         cookie = &cp->cookie;
2444         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2445         cookie_len = ntohs(cp->ch.chunk_length);
2446
2447         if ((cookie->peerport != sh->src_port) ||
2448             (cookie->myport != sh->dest_port) ||
2449             (cookie->my_vtag != sh->v_tag)) {
2450                 /*
2451                  * invalid ports or bad tag.  Note that we always leave the
2452                  * v_tag in the header in network order and when we stored
2453                  * it in the my_vtag slot we also left it in network order.
2454                  * This maintains the match even though it may be in the
2455                  * opposite byte order of the machine :->
2456                  */
2457                 return (NULL);
2458         }
2459         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2460             sizeof(struct sctp_init_chunk) +
2461             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2462                 /* cookie too small */
2463                 return (NULL);
2464         }
2465         /*
2466          * split off the signature into its own mbuf (since it should not be
2467          * calculated in the sctp_hmac_m() call).
2468          */
2469         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2470         m_sig = m_split(m, sig_offset, M_NOWAIT);
2471         if (m_sig == NULL) {
2472                 /* out of memory or ?? */
2473                 return (NULL);
2474         }
2475 #ifdef SCTP_MBUF_LOGGING
2476         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2477                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2478         }
2479 #endif
2480
2481         /*
2482          * compute the signature/digest for the cookie
2483          */
2484         ep = &(*inp_p)->sctp_ep;
2485         l_inp = *inp_p;
2486         if (l_stcb) {
2487                 SCTP_TCB_UNLOCK(l_stcb);
2488         }
2489         SCTP_INP_RLOCK(l_inp);
2490         if (l_stcb) {
2491                 SCTP_TCB_LOCK(l_stcb);
2492         }
2493         /* which cookie is it? */
2494         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2495             (ep->current_secret_number != ep->last_secret_number)) {
2496                 /* it's the old cookie */
2497                 (void)sctp_hmac_m(SCTP_HMAC,
2498                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2499                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2500         } else {
2501                 /* it's the current cookie */
2502                 (void)sctp_hmac_m(SCTP_HMAC,
2503                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2504                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2505         }
2506         /* get the signature */
2507         SCTP_INP_RUNLOCK(l_inp);
2508         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2509         if (sig == NULL) {
2510                 /* couldn't find signature */
2511                 sctp_m_freem(m_sig);
2512                 return (NULL);
2513         }
2514         /* compare the received digest with the computed digest */
2515         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2516                 /* try the old cookie? */
2517                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2518                     (ep->current_secret_number != ep->last_secret_number)) {
2519                         /* compute digest with old */
2520                         (void)sctp_hmac_m(SCTP_HMAC,
2521                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2522                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2523                         /* compare */
2524                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2525                                 cookie_ok = 1;
2526                 }
2527         } else {
2528                 cookie_ok = 1;
2529         }
2530
2531         /*
2532          * Now before we continue we must reconstruct our mbuf so that
2533          * normal processing of any other chunks will work.
2534          */
2535         {
2536                 struct mbuf *m_at;
2537
2538                 m_at = m;
2539                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2540                         m_at = SCTP_BUF_NEXT(m_at);
2541                 }
2542                 SCTP_BUF_NEXT(m_at) = m_sig;
2543         }
2544
2545         if (cookie_ok == 0) {
2546                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2547                 SCTPDBG(SCTP_DEBUG_INPUT2,
2548                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2549                     (uint32_t) offset, cookie_offset, sig_offset);
2550                 return (NULL);
2551         }
2552         /*
2553          * check the cookie timestamps to be sure it's not stale
2554          */
2555         (void)SCTP_GETTIME_TIMEVAL(&now);
2556         /* Expire time is in Ticks, so we convert to seconds */
2557         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2558         time_expires.tv_usec = cookie->time_entered.tv_usec;
2559         /*
2560          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2561          * is undefined.
2562          */
2563         if (timevalcmp(&now, &time_expires, >)) {
2564                 /* cookie is stale! */
2565                 struct mbuf *op_err;
2566                 struct sctp_error_stale_cookie *cause;
2567                 uint32_t tim;
2568
2569                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2570                     0, M_NOWAIT, 1, MT_DATA);
2571                 if (op_err == NULL) {
2572                         /* FOOBAR */
2573                         return (NULL);
2574                 }
2575                 /* Set the len */
2576                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2577                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2578                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2579                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2580                     (sizeof(uint32_t))));
2581                 /* seconds to usec */
2582                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2583                 /* add in usec */
2584                 if (tim == 0)
2585                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2586                 cause->stale_time = htonl(tim);
2587                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2588                     mflowtype, mflowid, l_inp->fibnum,
2589                     vrf_id, port);
2590                 return (NULL);
2591         }
2592         /*
2593          * Now we must see with the lookup address if we have an existing
2594          * asoc. This will only happen if we were in the COOKIE-WAIT state
2595          * and a INIT collided with us and somewhere the peer sent the
2596          * cookie on another address besides the single address our assoc
2597          * had for him. In this case we will have one of the tie-tags set at
2598          * least AND the address field in the cookie can be used to look it
2599          * up.
2600          */
2601         to = NULL;
2602         switch (cookie->addr_type) {
2603 #ifdef INET6
2604         case SCTP_IPV6_ADDRESS:
2605                 memset(&sin6, 0, sizeof(sin6));
2606                 sin6.sin6_family = AF_INET6;
2607                 sin6.sin6_len = sizeof(sin6);
2608                 sin6.sin6_port = sh->src_port;
2609                 sin6.sin6_scope_id = cookie->scope_id;
2610                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2611                     sizeof(sin6.sin6_addr.s6_addr));
2612                 to = (struct sockaddr *)&sin6;
2613                 break;
2614 #endif
2615 #ifdef INET
2616         case SCTP_IPV4_ADDRESS:
2617                 memset(&sin, 0, sizeof(sin));
2618                 sin.sin_family = AF_INET;
2619                 sin.sin_len = sizeof(sin);
2620                 sin.sin_port = sh->src_port;
2621                 sin.sin_addr.s_addr = cookie->address[0];
2622                 to = (struct sockaddr *)&sin;
2623                 break;
2624 #endif
2625         default:
2626                 /* This should not happen */
2627                 return (NULL);
2628         }
2629         if (*stcb == NULL) {
2630                 /* Yep, lets check */
2631                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2632                 if (*stcb == NULL) {
2633                         /*
2634                          * We should have only got back the same inp. If we
2635                          * got back a different ep we have a problem. The
2636                          * original findep got back l_inp and now
2637                          */
2638                         if (l_inp != *inp_p) {
2639                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2640                         }
2641                 } else {
2642                         if (*locked_tcb == NULL) {
2643                                 /*
2644                                  * In this case we found the assoc only
2645                                  * after we locked the create lock. This
2646                                  * means we are in a colliding case and we
2647                                  * must make sure that we unlock the tcb if
2648                                  * its one of the cases where we throw away
2649                                  * the incoming packets.
2650                                  */
2651                                 *locked_tcb = *stcb;
2652
2653                                 /*
2654                                  * We must also increment the inp ref count
2655                                  * since the ref_count flags was set when we
2656                                  * did not find the TCB, now we found it
2657                                  * which reduces the refcount.. we must
2658                                  * raise it back out to balance it all :-)
2659                                  */
2660                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2661                                 if ((*stcb)->sctp_ep != l_inp) {
2662                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2663                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2664                                 }
2665                         }
2666                 }
2667         }
2668         cookie_len -= SCTP_SIGNATURE_SIZE;
2669         if (*stcb == NULL) {
2670                 /* this is the "normal" case... get a new TCB */
2671                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2672                     cookie, cookie_len, *inp_p,
2673                     netp, to, &notification,
2674                     auth_skipped, auth_offset, auth_len,
2675                     mflowtype, mflowid,
2676                     vrf_id, port);
2677         } else {
2678                 /* this is abnormal... cookie-echo on existing TCB */
2679                 had_a_existing_tcb = 1;
2680                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2681                     src, dst, sh,
2682                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2683                     &notification, auth_skipped, auth_offset, auth_len,
2684                     mflowtype, mflowid,
2685                     vrf_id, port);
2686         }
2687
2688         if (*stcb == NULL) {
2689                 /* still no TCB... must be bad cookie-echo */
2690                 return (NULL);
2691         }
2692         if (*netp != NULL) {
2693                 (*netp)->flowtype = mflowtype;
2694                 (*netp)->flowid = mflowid;
2695         }
2696         /*
2697          * Ok, we built an association so confirm the address we sent the
2698          * INIT-ACK to.
2699          */
2700         netl = sctp_findnet(*stcb, to);
2701         /*
2702          * This code should in theory NOT run but
2703          */
2704         if (netl == NULL) {
2705                 /* TSNH! Huh, why do I need to add this address here? */
2706                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2707                         return (NULL);
2708                 }
2709                 netl = sctp_findnet(*stcb, to);
2710         }
2711         if (netl) {
2712                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2713                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2714                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2715                             netl);
2716                         send_int_conf = 1;
2717                 }
2718         }
2719         sctp_start_net_timers(*stcb);
2720         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2721                 if (!had_a_existing_tcb ||
2722                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2723                         /*
2724                          * If we have a NEW cookie or the connect never
2725                          * reached the connected state during collision we
2726                          * must do the TCP accept thing.
2727                          */
2728                         struct socket *so, *oso;
2729                         struct sctp_inpcb *inp;
2730
2731                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2732                                 /*
2733                                  * For a restart we will keep the same
2734                                  * socket, no need to do anything. I THINK!!
2735                                  */
2736                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2737                                 if (send_int_conf) {
2738                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2739                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2740                                 }
2741                                 return (m);
2742                         }
2743                         oso = (*inp_p)->sctp_socket;
2744                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2745                         SCTP_TCB_UNLOCK((*stcb));
2746                         CURVNET_SET(oso->so_vnet);
2747                         so = sonewconn(oso, 0
2748                             );
2749                         CURVNET_RESTORE();
2750                         SCTP_TCB_LOCK((*stcb));
2751                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2752
2753                         if (so == NULL) {
2754                                 struct mbuf *op_err;
2755
2756 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2757                                 struct socket *pcb_so;
2758
2759 #endif
2760                                 /* Too many sockets */
2761                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2762                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2763                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2764                                     src, dst, sh, op_err,
2765                                     mflowtype, mflowid,
2766                                     vrf_id, port);
2767 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2768                                 pcb_so = SCTP_INP_SO(*inp_p);
2769                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2770                                 SCTP_TCB_UNLOCK((*stcb));
2771                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2772                                 SCTP_TCB_LOCK((*stcb));
2773                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2774 #endif
2775                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2776                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2777 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2778                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2779 #endif
2780                                 return (NULL);
2781                         }
2782                         inp = (struct sctp_inpcb *)so->so_pcb;
2783                         SCTP_INP_INCR_REF(inp);
2784                         /*
2785                          * We add the unbound flag here so that if we get an
2786                          * soabort() before we get the move_pcb done, we
2787                          * will properly cleanup.
2788                          */
2789                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2790                             SCTP_PCB_FLAGS_CONNECTED |
2791                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2792                             SCTP_PCB_FLAGS_UNBOUND |
2793                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2794                             SCTP_PCB_FLAGS_DONT_WAKE);
2795                         inp->sctp_features = (*inp_p)->sctp_features;
2796                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2797                         inp->sctp_socket = so;
2798                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2799                         inp->max_cwnd = (*inp_p)->max_cwnd;
2800                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2801                         inp->ecn_supported = (*inp_p)->ecn_supported;
2802                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2803                         inp->auth_supported = (*inp_p)->auth_supported;
2804                         inp->asconf_supported = (*inp_p)->asconf_supported;
2805                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2806                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2807                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2808                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2809                         inp->sctp_context = (*inp_p)->sctp_context;
2810                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2811                         inp->fibnum = (*inp_p)->fibnum;
2812                         inp->inp_starting_point_for_iterator = NULL;
2813                         /*
2814                          * copy in the authentication parameters from the
2815                          * original endpoint
2816                          */
2817                         if (inp->sctp_ep.local_hmacs)
2818                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2819                         inp->sctp_ep.local_hmacs =
2820                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2821                         if (inp->sctp_ep.local_auth_chunks)
2822                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2823                         inp->sctp_ep.local_auth_chunks =
2824                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2825
2826                         /*
2827                          * Now we must move it from one hash table to
2828                          * another and get the tcb in the right place.
2829                          */
2830
2831                         /*
2832                          * This is where the one-2-one socket is put into
2833                          * the accept state waiting for the accept!
2834                          */
2835                         if (*stcb) {
2836                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2837                         }
2838                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2839
2840                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2841                         SCTP_TCB_UNLOCK((*stcb));
2842
2843                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2844                             0);
2845                         SCTP_TCB_LOCK((*stcb));
2846                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2847
2848
2849                         /*
2850                          * now we must check to see if we were aborted while
2851                          * the move was going on and the lock/unlock
2852                          * happened.
2853                          */
2854                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2855                                 /*
2856                                  * yep it was, we leave the assoc attached
2857                                  * to the socket since the sctp_inpcb_free()
2858                                  * call will send an abort for us.
2859                                  */
2860                                 SCTP_INP_DECR_REF(inp);
2861                                 return (NULL);
2862                         }
2863                         SCTP_INP_DECR_REF(inp);
2864                         /* Switch over to the new guy */
2865                         *inp_p = inp;
2866                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2867                         if (send_int_conf) {
2868                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2869                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2870                         }
2871                         /*
2872                          * Pull it from the incomplete queue and wake the
2873                          * guy
2874                          */
2875 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2876                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2877                         SCTP_TCB_UNLOCK((*stcb));
2878                         SCTP_SOCKET_LOCK(so, 1);
2879 #endif
2880                         soisconnected(so);
2881 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2882                         SCTP_TCB_LOCK((*stcb));
2883                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2884                         SCTP_SOCKET_UNLOCK(so, 1);
2885 #endif
2886                         return (m);
2887                 }
2888         }
2889         if (notification) {
2890                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2891         }
2892         if (send_int_conf) {
2893                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2894                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2895         }
2896         return (m);
2897 }
2898
2899 static void
2900 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2901     struct sctp_tcb *stcb, struct sctp_nets *net)
2902 {
2903         /* cp must not be used, others call this without a c-ack :-) */
2904         struct sctp_association *asoc;
2905
2906         SCTPDBG(SCTP_DEBUG_INPUT2,
2907             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2908         if ((stcb == NULL) || (net == NULL)) {
2909                 return;
2910         }
2911         asoc = &stcb->asoc;
2912
2913         sctp_stop_all_cookie_timers(stcb);
2914         /* process according to association state */
2915         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2916                 /* state change only needed when I am in right state */
2917                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2918                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2919                 sctp_start_net_timers(stcb);
2920                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2921                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2922                             stcb->sctp_ep, stcb, asoc->primary_destination);
2923
2924                 }
2925                 /* update RTO */
2926                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2927                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2928                 if (asoc->overall_error_count == 0) {
2929                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2930                             &asoc->time_entered, sctp_align_safe_nocopy,
2931                             SCTP_RTT_FROM_NON_DATA);
2932                 }
2933                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2934                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2935                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2936                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2937 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2938                         struct socket *so;
2939
2940 #endif
2941                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2942 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2943                         so = SCTP_INP_SO(stcb->sctp_ep);
2944                         atomic_add_int(&stcb->asoc.refcnt, 1);
2945                         SCTP_TCB_UNLOCK(stcb);
2946                         SCTP_SOCKET_LOCK(so, 1);
2947                         SCTP_TCB_LOCK(stcb);
2948                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2949 #endif
2950                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2951                                 soisconnected(stcb->sctp_socket);
2952                         }
2953 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2954                         SCTP_SOCKET_UNLOCK(so, 1);
2955 #endif
2956                 }
2957                 /*
2958                  * since we did not send a HB make sure we don't double
2959                  * things
2960                  */
2961                 net->hb_responded = 1;
2962
2963                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2964                         /*
2965                          * We don't need to do the asconf thing, nor hb or
2966                          * autoclose if the socket is closed.
2967                          */
2968                         goto closed_socket;
2969                 }
2970                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2971                     stcb, net);
2972
2973
2974                 if (stcb->asoc.sctp_autoclose_ticks &&
2975                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2976                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2977                             stcb->sctp_ep, stcb, NULL);
2978                 }
2979                 /*
2980                  * send ASCONF if parameters are pending and ASCONFs are
2981                  * allowed (eg. addresses changed when init/cookie echo were
2982                  * in flight)
2983                  */
2984                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2985                     (stcb->asoc.asconf_supported == 1) &&
2986                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2987 #ifdef SCTP_TIMER_BASED_ASCONF
2988                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2989                             stcb->sctp_ep, stcb,
2990                             stcb->asoc.primary_destination);
2991 #else
2992                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2993                             SCTP_ADDR_NOT_LOCKED);
2994 #endif
2995                 }
2996         }
2997 closed_socket:
2998         /* Toss the cookie if I can */
2999         sctp_toss_old_cookies(stcb, asoc);
3000         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3001                 /* Restart the timer if we have pending data */
3002                 struct sctp_tmit_chunk *chk;
3003
3004                 chk = TAILQ_FIRST(&asoc->sent_queue);
3005                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3006         }
3007 }
3008
3009 static void
3010 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3011     struct sctp_tcb *stcb)
3012 {
3013         struct sctp_nets *net;
3014         struct sctp_tmit_chunk *lchk;
3015         struct sctp_ecne_chunk bkup;
3016         uint8_t override_bit;
3017         uint32_t tsn, window_data_tsn;
3018         int len;
3019         unsigned int pkt_cnt;
3020
3021         len = ntohs(cp->ch.chunk_length);
3022         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3023             (len != sizeof(struct old_sctp_ecne_chunk))) {
3024                 return;
3025         }
3026         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3027                 /* Its the old format */
3028                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3029                 bkup.num_pkts_since_cwr = htonl(1);
3030                 cp = &bkup;
3031         }
3032         SCTP_STAT_INCR(sctps_recvecne);
3033         tsn = ntohl(cp->tsn);
3034         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3035         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3036         if (lchk == NULL) {
3037                 window_data_tsn = stcb->asoc.sending_seq - 1;
3038         } else {
3039                 window_data_tsn = lchk->rec.data.TSN_seq;
3040         }
3041
3042         /* Find where it was sent to if possible. */
3043         net = NULL;
3044         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3045                 if (lchk->rec.data.TSN_seq == tsn) {
3046                         net = lchk->whoTo;
3047                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3048                         break;
3049                 }
3050                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3051                         break;
3052                 }
3053         }
3054         if (net == NULL) {
3055                 /*
3056                  * What to do. A previous send of a CWR was possibly lost.
3057                  * See how old it is, we may have it marked on the actual
3058                  * net.
3059                  */
3060                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3061                         if (tsn == net->last_cwr_tsn) {
3062                                 /* Found him, send it off */
3063                                 break;
3064                         }
3065                 }
3066                 if (net == NULL) {
3067                         /*
3068                          * If we reach here, we need to send a special CWR
3069                          * that says hey, we did this a long time ago and
3070                          * you lost the response.
3071                          */
3072                         net = TAILQ_FIRST(&stcb->asoc.nets);
3073                         if (net == NULL) {
3074                                 /* TSNH */
3075                                 return;
3076                         }
3077                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3078                 } else {
3079                         override_bit = 0;
3080                 }
3081         } else {
3082                 override_bit = 0;
3083         }
3084         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3085             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3086                 /*
3087                  * JRS - Use the congestion control given in the pluggable
3088                  * CC module
3089                  */
3090                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3091                 /*
3092                  * We reduce once every RTT. So we will only lower cwnd at
3093                  * the next sending seq i.e. the window_data_tsn
3094                  */
3095                 net->cwr_window_tsn = window_data_tsn;
3096                 net->ecn_ce_pkt_cnt += pkt_cnt;
3097                 net->lost_cnt = pkt_cnt;
3098                 net->last_cwr_tsn = tsn;
3099         } else {
3100                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3101                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3102                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3103                         /*
3104                          * Another loss in the same window update how many
3105                          * marks/packets lost we have had.
3106                          */
3107                         int cnt = 1;
3108
3109                         if (pkt_cnt > net->lost_cnt) {
3110                                 /* Should be the case */
3111                                 cnt = (pkt_cnt - net->lost_cnt);
3112                                 net->ecn_ce_pkt_cnt += cnt;
3113                         }
3114                         net->lost_cnt = pkt_cnt;
3115                         net->last_cwr_tsn = tsn;
3116                         /*
3117                          * Most CC functions will ignore this call, since we
3118                          * are in-window yet of the initial CE the peer saw.
3119                          */
3120                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3121                 }
3122         }
3123         /*
3124          * We always send a CWR this way if our previous one was lost our
3125          * peer will get an update, or if it is not time again to reduce we
3126          * still get the cwr to the peer. Note we set the override when we
3127          * could not find the TSN on the chunk or the destination network.
3128          */
3129         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3130 }
3131
3132 static void
3133 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3134 {
3135         /*
3136          * Here we get a CWR from the peer. We must look in the outqueue and
3137          * make sure that we have a covered ECNE in the control chunk part.
3138          * If so remove it.
3139          */
3140         struct sctp_tmit_chunk *chk;
3141         struct sctp_ecne_chunk *ecne;
3142         int override;
3143         uint32_t cwr_tsn;
3144
3145         cwr_tsn = ntohl(cp->tsn);
3146         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3147         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3148                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3149                         continue;
3150                 }
3151                 if ((override == 0) && (chk->whoTo != net)) {
3152                         /* Must be from the right src unless override is set */
3153                         continue;
3154                 }
3155                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3156                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3157                         /* this covers this ECNE, we can remove it */
3158                         stcb->asoc.ecn_echo_cnt_onq--;
3159                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3160                             sctp_next);
3161                         sctp_m_freem(chk->data);
3162                         chk->data = NULL;
3163                         stcb->asoc.ctrl_queue_cnt--;
3164                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3165                         if (override == 0) {
3166                                 break;
3167                         }
3168                 }
3169         }
3170 }
3171
3172 static void
3173 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3174     struct sctp_tcb *stcb, struct sctp_nets *net)
3175 {
3176         struct sctp_association *asoc;
3177
3178 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3179         struct socket *so;
3180
3181 #endif
3182
3183         SCTPDBG(SCTP_DEBUG_INPUT2,
3184             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3185         if (stcb == NULL)
3186                 return;
3187
3188         asoc = &stcb->asoc;
3189         /* process according to association state */
3190         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3191                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3192                 SCTPDBG(SCTP_DEBUG_INPUT2,
3193                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3194                 SCTP_TCB_UNLOCK(stcb);
3195                 return;
3196         }
3197         /* notify upper layer protocol */
3198         if (stcb->sctp_socket) {
3199                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3200         }
3201 #ifdef INVARIANTS
3202         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3203             !TAILQ_EMPTY(&asoc->sent_queue) ||
3204             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3205                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3206         }
3207 #endif
3208         /* stop the timer */
3209         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3210             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3211         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3212         /* free the TCB */
3213         SCTPDBG(SCTP_DEBUG_INPUT2,
3214             "sctp_handle_shutdown_complete: calls free-asoc\n");
3215 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3216         so = SCTP_INP_SO(stcb->sctp_ep);
3217         atomic_add_int(&stcb->asoc.refcnt, 1);
3218         SCTP_TCB_UNLOCK(stcb);
3219         SCTP_SOCKET_LOCK(so, 1);
3220         SCTP_TCB_LOCK(stcb);
3221         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3222 #endif
3223         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3224             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3225 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3226         SCTP_SOCKET_UNLOCK(so, 1);
3227 #endif
3228         return;
3229 }
3230
3231 static int
3232 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3233     struct sctp_nets *net, uint8_t flg)
3234 {
3235         switch (desc->chunk_type) {
3236         case SCTP_DATA:
3237                 /* find the tsn to resend (possibly */
3238                 {
3239                         uint32_t tsn;
3240                         struct sctp_tmit_chunk *tp1;
3241
3242                         tsn = ntohl(desc->tsn_ifany);
3243                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3244                                 if (tp1->rec.data.TSN_seq == tsn) {
3245                                         /* found it */
3246                                         break;
3247                                 }
3248                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3249                                         /* not found */
3250                                         tp1 = NULL;
3251                                         break;
3252                                 }
3253                         }
3254                         if (tp1 == NULL) {
3255                                 /*
3256                                  * Do it the other way , aka without paying
3257                                  * attention to queue seq order.
3258                                  */
3259                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3260                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3261                                         if (tp1->rec.data.TSN_seq == tsn) {
3262                                                 /* found it */
3263                                                 break;
3264                                         }
3265                                 }
3266                         }
3267                         if (tp1 == NULL) {
3268                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3269                         }
3270                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3271                                 uint8_t *ddp;
3272
3273                                 if (((flg & SCTP_BADCRC) == 0) &&
3274                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3275                                         return (0);
3276                                 }
3277                                 if ((stcb->asoc.peers_rwnd == 0) &&
3278                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3279                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3280                                         return (0);
3281                                 }
3282                                 if (stcb->asoc.peers_rwnd == 0 &&
3283                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3284                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3285                                         return (0);
3286                                 }
3287                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3288                                     sizeof(struct sctp_data_chunk));
3289                                 {
3290                                         unsigned int iii;
3291
3292                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3293                                             iii++) {
3294                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3295                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3296                                                         return (-1);
3297                                                 }
3298                                         }
3299                                 }
3300
3301                                 if (tp1->do_rtt) {
3302                                         /*
3303                                          * this guy had a RTO calculation
3304                                          * pending on it, cancel it
3305                                          */
3306                                         if (tp1->whoTo->rto_needed == 0) {
3307                                                 tp1->whoTo->rto_needed = 1;
3308                                         }
3309                                         tp1->do_rtt = 0;
3310                                 }
3311                                 SCTP_STAT_INCR(sctps_pdrpmark);
3312                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3313                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3314                                 /*
3315                                  * mark it as if we were doing a FR, since
3316                                  * we will be getting gap ack reports behind
3317                                  * the info from the router.
3318                                  */
3319                                 tp1->rec.data.doing_fast_retransmit = 1;
3320                                 /*
3321                                  * mark the tsn with what sequences can
3322                                  * cause a new FR.
3323                                  */
3324                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3325                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3326                                 } else {
3327                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3328                                 }
3329
3330                                 /* restart the timer */
3331                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3332                                     stcb, tp1->whoTo,
3333                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3334                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3335                                     stcb, tp1->whoTo);
3336
3337                                 /* fix counts and things */
3338                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3339                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3340                                             tp1->whoTo->flight_size,
3341                                             tp1->book_size,
3342                                             (uintptr_t) stcb,
3343                                             tp1->rec.data.TSN_seq);
3344                                 }
3345                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3346                                         sctp_flight_size_decrease(tp1);
3347                                         sctp_total_flight_decrease(stcb, tp1);
3348                                 }
3349                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3350                         } {
3351                                 /* audit code */
3352                                 unsigned int audit;
3353
3354                                 audit = 0;
3355                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3356                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3357                                                 audit++;
3358                                 }
3359                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3360                                     sctp_next) {
3361                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3362                                                 audit++;
3363                                 }
3364                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3365                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3366                                             audit, stcb->asoc.sent_queue_retran_cnt);
3367 #ifndef SCTP_AUDITING_ENABLED
3368                                         stcb->asoc.sent_queue_retran_cnt = audit;
3369 #endif
3370                                 }
3371                         }
3372                 }
3373                 break;
3374         case SCTP_ASCONF:
3375                 {
3376                         struct sctp_tmit_chunk *asconf;
3377
3378                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3379                             sctp_next) {
3380                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3381                                         break;
3382                                 }
3383                         }
3384                         if (asconf) {
3385                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3386                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3387                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3388                                 asconf->snd_count--;
3389                         }
3390                 }
3391                 break;
3392         case SCTP_INITIATION:
3393                 /* resend the INIT */
3394                 stcb->asoc.dropped_special_cnt++;
3395                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3396                         /*
3397                          * If we can get it in, in a few attempts we do
3398                          * this, otherwise we let the timer fire.
3399                          */
3400                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3401                             stcb, net,
3402                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3403                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3404                 }
3405                 break;
3406         case SCTP_SELECTIVE_ACK:
3407         case SCTP_NR_SELECTIVE_ACK:
3408                 /* resend the sack */
3409                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3410                 break;
3411         case SCTP_HEARTBEAT_REQUEST:
3412                 /* resend a demand HB */
3413                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3414                         /*
3415                          * Only retransmit if we KNOW we wont destroy the
3416                          * tcb
3417                          */
3418                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3419                 }
3420                 break;
3421         case SCTP_SHUTDOWN:
3422                 sctp_send_shutdown(stcb, net);
3423                 break;
3424         case SCTP_SHUTDOWN_ACK:
3425                 sctp_send_shutdown_ack(stcb, net);
3426                 break;
3427         case SCTP_COOKIE_ECHO:
3428                 {
3429                         struct sctp_tmit_chunk *cookie;
3430
3431                         cookie = NULL;
3432                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3433                             sctp_next) {
3434                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3435                                         break;
3436                                 }
3437                         }
3438                         if (cookie) {
3439                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3440                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3441                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3442                                 sctp_stop_all_cookie_timers(stcb);
3443                         }
3444                 }
3445                 break;
3446         case SCTP_COOKIE_ACK:
3447                 sctp_send_cookie_ack(stcb);
3448                 break;
3449         case SCTP_ASCONF_ACK:
3450                 /* resend last asconf ack */
3451                 sctp_send_asconf_ack(stcb);
3452                 break;
3453         case SCTP_FORWARD_CUM_TSN:
3454                 send_forward_tsn(stcb, &stcb->asoc);
3455                 break;
3456                 /* can't do anything with these */
3457         case SCTP_PACKET_DROPPED:
3458         case SCTP_INITIATION_ACK:       /* this should not happen */
3459         case SCTP_HEARTBEAT_ACK:
3460         case SCTP_ABORT_ASSOCIATION:
3461         case SCTP_OPERATION_ERROR:
3462         case SCTP_SHUTDOWN_COMPLETE:
3463         case SCTP_ECN_ECHO:
3464         case SCTP_ECN_CWR:
3465         default:
3466                 break;
3467         }
3468         return (0);
3469 }
3470
3471 void
3472 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3473 {
3474         uint32_t i;
3475         uint16_t temp;
3476
3477         /*
3478          * We set things to 0xffff since this is the last delivered sequence
3479          * and we will be sending in 0 after the reset.
3480          */
3481
3482         if (number_entries) {
3483                 for (i = 0; i < number_entries; i++) {
3484                         temp = ntohs(list[i]);
3485                         if (temp >= stcb->asoc.streamincnt) {
3486                                 continue;
3487                         }
3488                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3489                 }
3490         } else {
3491                 list = NULL;
3492                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3493                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3494                 }
3495         }
3496         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3497 }
3498
3499 static void
3500 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3501 {
3502         uint32_t i;
3503         uint16_t temp;
3504
3505         if (number_entries > 0) {
3506                 for (i = 0; i < number_entries; i++) {
3507                         temp = ntohs(list[i]);
3508                         if (temp >= stcb->asoc.streamoutcnt) {
3509                                 /* no such stream */
3510                                 continue;
3511                         }
3512                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3513                 }
3514         } else {
3515                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3516                         stcb->asoc.strmout[i].next_sequence_send = 0;
3517                 }
3518         }
3519         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3520 }
3521
3522 static void
3523 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3524 {
3525         uint32_t i;
3526         uint16_t temp;
3527
3528         if (number_entries > 0) {
3529                 for (i = 0; i < number_entries; i++) {
3530                         temp = ntohs(list[i]);
3531                         if (temp >= stcb->asoc.streamoutcnt) {
3532                                 /* no such stream */
3533                                 continue;
3534                         }
3535                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3536                 }
3537         } else {
3538                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3539                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3540                 }
3541         }
3542 }
3543
3544
3545 struct sctp_stream_reset_request *
3546 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3547 {
3548         struct sctp_association *asoc;
3549         struct sctp_chunkhdr *ch;
3550         struct sctp_stream_reset_request *r;
3551         struct sctp_tmit_chunk *chk;
3552         int len, clen;
3553
3554         asoc = &stcb->asoc;
3555         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3556                 asoc->stream_reset_outstanding = 0;
3557                 return (NULL);
3558         }
3559         if (stcb->asoc.str_reset == NULL) {
3560                 asoc->stream_reset_outstanding = 0;
3561                 return (NULL);
3562         }
3563         chk = stcb->asoc.str_reset;
3564         if (chk->data == NULL) {
3565                 return (NULL);
3566         }
3567         if (bchk) {
3568                 /* he wants a copy of the chk pointer */
3569                 *bchk = chk;
3570         }
3571         clen = chk->send_size;
3572         ch = mtod(chk->data, struct sctp_chunkhdr *);
3573         r = (struct sctp_stream_reset_request *)(ch + 1);
3574         if (ntohl(r->request_seq) == seq) {
3575                 /* found it */
3576                 return (r);
3577         }
3578         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3579         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3580                 /* move to the next one, there can only be a max of two */
3581                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3582                 if (ntohl(r->request_seq) == seq) {
3583                         return (r);
3584                 }
3585         }
3586         /* that seq is not here */
3587         return (NULL);
3588 }
3589
3590 static void
3591 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3592 {
3593         struct sctp_association *asoc;
3594         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3595
3596         if (stcb->asoc.str_reset == NULL) {
3597                 return;
3598         }
3599         asoc = &stcb->asoc;
3600
3601         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3602             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3603         TAILQ_REMOVE(&asoc->control_send_queue,
3604             chk,
3605             sctp_next);
3606         if (chk->data) {
3607                 sctp_m_freem(chk->data);
3608                 chk->data = NULL;
3609         }
3610         asoc->ctrl_queue_cnt--;
3611         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3612         /* sa_ignore NO_NULL_CHK */
3613         stcb->asoc.str_reset = NULL;
3614 }
3615
3616
3617 static int
3618 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3619     uint32_t seq, uint32_t action,
3620     struct sctp_stream_reset_response *respin)
3621 {
3622         uint16_t type;
3623         int lparm_len;
3624         struct sctp_association *asoc = &stcb->asoc;
3625         struct sctp_tmit_chunk *chk;
3626         struct sctp_stream_reset_request *req_param;
3627         struct sctp_stream_reset_out_request *req_out_param;
3628         struct sctp_stream_reset_in_request *req_in_param;
3629         uint32_t number_entries;
3630
3631         if (asoc->stream_reset_outstanding == 0) {
3632                 /* duplicate */
3633                 return (0);
3634         }
3635         if (seq == stcb->asoc.str_reset_seq_out) {
3636                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3637                 if (req_param != NULL) {
3638                         stcb->asoc.str_reset_seq_out++;
3639                         type = ntohs(req_param->ph.param_type);
3640                         lparm_len = ntohs(req_param->ph.param_length);
3641                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3642                                 int no_clear = 0;
3643
3644                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3645                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3646                                 asoc->stream_reset_out_is_outstanding = 0;
3647                                 if (asoc->stream_reset_outstanding)
3648                                         asoc->stream_reset_outstanding--;
3649                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3650                                         /* do it */
3651                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3652                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3653                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3654                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3655                                         /*
3656                                          * Set it up so we don't stop
3657                                          * retransmitting
3658                                          */
3659                                         asoc->stream_reset_outstanding++;
3660                                         stcb->asoc.str_reset_seq_out--;
3661                                         asoc->stream_reset_out_is_outstanding = 1;
3662                                         no_clear = 1;
3663                                 } else {
3664                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3665                                 }
3666                                 if (no_clear == 0) {
3667                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3668                                 }
3669                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3670                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3671                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3672                                 if (asoc->stream_reset_outstanding)
3673                                         asoc->stream_reset_outstanding--;
3674                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3675                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3676                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3677                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3678                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3679                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3680                                 }
3681                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3682                                 /* Ok we now may have more streams */
3683                                 int num_stream;
3684
3685                                 num_stream = stcb->asoc.strm_pending_add_size;
3686                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3687                                         /* TSNH */
3688                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3689                                 }
3690                                 stcb->asoc.strm_pending_add_size = 0;
3691                                 if (asoc->stream_reset_outstanding)
3692                                         asoc->stream_reset_outstanding--;
3693                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3694                                         /* Put the new streams into effect */
3695                                         int i;
3696
3697                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3698                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3699                                         }
3700                                         asoc->streamoutcnt += num_stream;
3701                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3702                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3703                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3704                                             SCTP_STREAM_CHANGE_DENIED);
3705                                 } else {
3706                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3707                                             SCTP_STREAM_CHANGE_FAILED);
3708                                 }
3709                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3710                                 if (asoc->stream_reset_outstanding)
3711                                         asoc->stream_reset_outstanding--;
3712                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3713                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3714                                             SCTP_STREAM_CHANGE_DENIED);
3715                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3716                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3717                                             SCTP_STREAM_CHANGE_FAILED);
3718                                 }
3719                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3720                                 /**
3721                                  * a) Adopt the new in tsn.
3722                                  * b) reset the map
3723                                  * c) Adopt the new out-tsn
3724                                  */
3725                                 struct sctp_stream_reset_response_tsn *resp;
3726                                 struct sctp_forward_tsn_chunk fwdtsn;
3727                                 int abort_flag = 0;
3728
3729                                 if (respin == NULL) {
3730                                         /* huh ? */
3731                                         return (0);
3732                                 }
3733                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3734                                         return (0);
3735                                 }
3736                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3737                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3738                                         asoc->stream_reset_outstanding--;
3739                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3740                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3741                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3742                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3743                                         if (abort_flag) {
3744                                                 return (1);
3745                                         }
3746                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3747                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3748                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3749                                         }
3750                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3751                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3752                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3753
3754                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3755                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3756
3757                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3758                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3759
3760                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3761                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3762                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3763                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3764                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3765                                             SCTP_ASSOC_RESET_DENIED);
3766                                 } else {
3767                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3768                                             SCTP_ASSOC_RESET_FAILED);
3769                                 }
3770                         }
3771                         /* get rid of the request and get the request flags */
3772                         if (asoc->stream_reset_outstanding == 0) {
3773                                 sctp_clean_up_stream_reset(stcb);
3774                         }
3775                 }
3776         }
3777         if (asoc->stream_reset_outstanding == 0) {
3778                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3779         }
3780         return (0);
3781 }
3782
3783 static void
3784 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3785     struct sctp_tmit_chunk *chk,
3786     struct sctp_stream_reset_in_request *req, int trunc)
3787 {
3788         uint32_t seq;
3789         int len, i;
3790         int number_entries;
3791         uint16_t temp;
3792
3793         /*
3794          * peer wants me to send a str-reset to him for my outgoing seq's if
3795          * seq_in is right.
3796          */
3797         struct sctp_association *asoc = &stcb->asoc;
3798
3799         seq = ntohl(req->request_seq);
3800         if (asoc->str_reset_seq_in == seq) {
3801                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3802                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3803                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3804                 } else if (trunc) {
3805                         /* Can't do it, since they exceeded our buffer size  */
3806                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3807                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3808                         len = ntohs(req->ph.param_length);
3809                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3810                         if (number_entries) {
3811                                 for (i = 0; i < number_entries; i++) {
3812                                         temp = ntohs(req->list_of_streams[i]);
3813                                         if (temp >= stcb->asoc.streamoutcnt) {
3814                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3815                                                 goto bad_boy;
3816                                         }
3817                                         req->list_of_streams[i] = temp;
3818                                 }
3819                                 for (i = 0; i < number_entries; i++) {
3820                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3821                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3822                                         }
3823                                 }
3824                         } else {
3825                                 /* Its all */
3826                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3827                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3828                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3829                                 }
3830                         }
3831                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3832                 } else {
3833                         /* Can't do it, since we have sent one out */
3834                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3835                 }
3836 bad_boy:
3837                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3838                 asoc->str_reset_seq_in++;
3839         } else if (asoc->str_reset_seq_in - 1 == seq) {
3840                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3841         } else if (asoc->str_reset_seq_in - 2 == seq) {
3842                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3843         } else {
3844                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3845         }
3846         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3847 }
3848
3849 static int
3850 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3851     struct sctp_tmit_chunk *chk,
3852     struct sctp_stream_reset_tsn_request *req)
3853 {
3854         /* reset all in and out and update the tsn */
3855         /*
3856          * A) reset my str-seq's on in and out. B) Select a receive next,
3857          * and set cum-ack to it. Also process this selected number as a
3858          * fwd-tsn as well. C) set in the response my next sending seq.
3859          */
3860         struct sctp_forward_tsn_chunk fwdtsn;
3861         struct sctp_association *asoc = &stcb->asoc;
3862         int abort_flag = 0;
3863         uint32_t seq;
3864
3865         seq = ntohl(req->request_seq);
3866         if (asoc->str_reset_seq_in == seq) {
3867                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3868                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3869                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3870                 } else {
3871                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3872                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3873                         fwdtsn.ch.chunk_flags = 0;
3874                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3875                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3876                         if (abort_flag) {
3877                                 return (1);
3878                         }
3879                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3880                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3881                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3882                         }
3883                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3884                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3885                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3886                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3887                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3888                         atomic_add_int(&asoc->sending_seq, 1);
3889                         /* save off historical data for retrans */
3890                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3891                         asoc->last_sending_seq[0] = asoc->sending_seq;
3892                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3893                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3894                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3895                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3896                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3897                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3898                 }
3899                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3900                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3901                 asoc->str_reset_seq_in++;
3902         } else if (asoc->str_reset_seq_in - 1 == seq) {
3903                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3904                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3905         } else if (asoc->str_reset_seq_in - 2 == seq) {
3906                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3907                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3908         } else {
3909                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3910         }
3911         return (0);
3912 }
3913
3914 static void
3915 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3916     struct sctp_tmit_chunk *chk,
3917     struct sctp_stream_reset_out_request *req, int trunc)
3918 {
3919         uint32_t seq, tsn;
3920         int number_entries, len;
3921         struct sctp_association *asoc = &stcb->asoc;
3922
3923         seq = ntohl(req->request_seq);
3924
3925         /* now if its not a duplicate we process it */
3926         if (asoc->str_reset_seq_in == seq) {
3927                 len = ntohs(req->ph.param_length);
3928                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3929                 /*
3930                  * the sender is resetting, handle the list issue.. we must
3931                  * a) verify if we can do the reset, if so no problem b) If
3932                  * we can't do the reset we must copy the request. c) queue
3933                  * it, and setup the data in processor to trigger it off
3934                  * when needed and dequeue all the queued data.
3935                  */
3936                 tsn = ntohl(req->send_reset_at_tsn);
3937
3938                 /* move the reset action back one */
3939                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3940                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3941                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3942                 } else if (trunc) {
3943                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3944                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3945                         /* we can do it now */
3946                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3947                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3948                 } else {
3949                         /*
3950                          * we must queue it up and thus wait for the TSN's
3951                          * to arrive that are at or before tsn
3952                          */
3953                         struct sctp_stream_reset_list *liste;
3954                         int siz;
3955
3956                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3957                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3958                             siz, SCTP_M_STRESET);
3959                         if (liste == NULL) {
3960                                 /* gak out of memory */
3961                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3962                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3963                                 return;
3964                         }
3965                         liste->seq = seq;
3966                         liste->tsn = tsn;
3967                         liste->number_entries = number_entries;
3968                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3969                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3970                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3971                 }
3972                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3973                 asoc->str_reset_seq_in++;
3974         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3975                 /*
3976                  * one seq back, just echo back last action since my
3977                  * response was lost.
3978                  */
3979                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3980         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3981                 /*
3982                  * two seq back, just echo back last action since my
3983                  * response was lost.
3984                  */
3985                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3986         } else {
3987                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3988         }
3989 }
3990
3991 static void
3992 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3993     struct sctp_stream_reset_add_strm *str_add)
3994 {
3995         /*
3996          * Peer is requesting to add more streams. If its within our
3997          * max-streams we will allow it.
3998          */
3999         uint32_t num_stream, i;
4000         uint32_t seq;
4001         struct sctp_association *asoc = &stcb->asoc;
4002         struct sctp_queued_to_read *ctl, *nctl;
4003
4004         /* Get the number. */
4005         seq = ntohl(str_add->request_seq);
4006         num_stream = ntohs(str_add->number_of_streams);
4007         /* Now what would be the new total? */
4008         if (asoc->str_reset_seq_in == seq) {
4009                 num_stream += stcb->asoc.streamincnt;
4010                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4011                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4012                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4013                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4014                     (num_stream > 0xffff)) {
4015                         /* We must reject it they ask for to many */
4016         denied:
4017                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4018                 } else {
4019                         /* Ok, we can do that :-) */
4020                         struct sctp_stream_in *oldstrm;
4021
4022                         /* save off the old */
4023                         oldstrm = stcb->asoc.strmin;
4024                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4025                             (num_stream * sizeof(struct sctp_stream_in)),
4026                             SCTP_M_STRMI);
4027                         if (stcb->asoc.strmin == NULL) {
4028                                 stcb->asoc.strmin = oldstrm;
4029                                 goto denied;
4030                         }
4031                         /* copy off the old data */
4032                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4033                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4034                                 stcb->asoc.strmin[i].stream_no = i;
4035                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
4036                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4037                                 /* now anything on those queues? */
4038                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
4039                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
4040                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
4041                                 }
4042                         }
4043                         /* Init the new streams */
4044                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4045                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4046                                 stcb->asoc.strmin[i].stream_no = i;
4047                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
4048                                 stcb->asoc.strmin[i].delivery_started = 0;
4049                         }
4050                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4051                         /* update the size */
4052                         stcb->asoc.streamincnt = num_stream;
4053                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4054                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4055                 }
4056                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4057                 asoc->str_reset_seq_in++;
4058         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4059                 /*
4060                  * one seq back, just echo back last action since my
4061                  * response was lost.
4062                  */
4063                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4064         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4065                 /*
4066                  * two seq back, just echo back last action since my
4067                  * response was lost.
4068                  */
4069                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4070         } else {
4071                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4072
4073         }
4074 }
4075
4076 static void
4077 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4078     struct sctp_stream_reset_add_strm *str_add)
4079 {
4080         /*
4081          * Peer is requesting to add more streams. If its within our
4082          * max-streams we will allow it.
4083          */
4084         uint16_t num_stream;
4085         uint32_t seq;
4086         struct sctp_association *asoc = &stcb->asoc;
4087
4088         /* Get the number. */
4089         seq = ntohl(str_add->request_seq);
4090         num_stream = ntohs(str_add->number_of_streams);
4091         /* Now what would be the new total? */
4092         if (asoc->str_reset_seq_in == seq) {
4093                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4094                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4095                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4096                 } else if (stcb->asoc.stream_reset_outstanding) {
4097                         /* We must reject it we have something pending */
4098                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4099                 } else {
4100                         /* Ok, we can do that :-) */
4101                         int mychk;
4102
4103                         mychk = stcb->asoc.streamoutcnt;
4104                         mychk += num_stream;
4105                         if (mychk < 0x10000) {
4106                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4107                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4108                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4109                                 }
4110                         } else {
4111                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4112                         }
4113                 }
4114                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4115                 asoc->str_reset_seq_in++;
4116         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4117                 /*
4118                  * one seq back, just echo back last action since my
4119                  * response was lost.
4120                  */
4121                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4122         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4123                 /*
4124                  * two seq back, just echo back last action since my
4125                  * response was lost.
4126                  */
4127                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4128         } else {
4129                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4130         }
4131 }
4132
4133 #ifdef __GNUC__
4134 __attribute__((noinline))
4135 #endif
4136         static int
4137             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4138         struct sctp_chunkhdr *ch_req)
4139 {
4140         uint16_t remaining_length, param_len, ptype;
4141         struct sctp_paramhdr pstore;
4142         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4143         uint32_t seq = 0;
4144         int num_req = 0;
4145         int trunc = 0;
4146         struct sctp_tmit_chunk *chk;
4147         struct sctp_chunkhdr *ch;
4148         struct sctp_paramhdr *ph;
4149         int ret_code = 0;
4150         int num_param = 0;
4151
4152         /* now it may be a reset or a reset-response */
4153         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4154
4155         /* setup for adding the response */
4156         sctp_alloc_a_chunk(stcb, chk);
4157         if (chk == NULL) {
4158                 return (ret_code);
4159         }
4160         chk->copy_by_ref = 0;
4161         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4162         chk->rec.chunk_id.can_take_data = 0;
4163         chk->flags = 0;
4164         chk->asoc = &stcb->asoc;
4165         chk->no_fr_allowed = 0;
4166         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4167         chk->book_size_scale = 0;
4168         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4169         if (chk->data == NULL) {
4170 strres_nochunk:
4171                 if (chk->data) {
4172                         sctp_m_freem(chk->data);
4173                         chk->data = NULL;
4174                 }
4175                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4176                 return (ret_code);
4177         }
4178         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4179
4180         /* setup chunk parameters */
4181         chk->sent = SCTP_DATAGRAM_UNSENT;
4182         chk->snd_count = 0;
4183         chk->whoTo = NULL;
4184
4185         ch = mtod(chk->data, struct sctp_chunkhdr *);
4186         ch->chunk_type = SCTP_STREAM_RESET;
4187         ch->chunk_flags = 0;
4188         ch->chunk_length = htons(chk->send_size);
4189         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4190         offset += sizeof(struct sctp_chunkhdr);
4191         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4192                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4193                 if (ph == NULL) {
4194                         /* TSNH */
4195                         break;
4196                 }
4197                 param_len = ntohs(ph->param_length);
4198                 if ((param_len > remaining_length) ||
4199                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4200                         /* bad parameter length */
4201                         break;
4202                 }
4203                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4204                     (uint8_t *) & cstore);
4205                 if (ph == NULL) {
4206                         /* TSNH */
4207                         break;
4208                 }
4209                 ptype = ntohs(ph->param_type);
4210                 num_param++;
4211                 if (param_len > sizeof(cstore)) {
4212                         trunc = 1;
4213                 } else {
4214                         trunc = 0;
4215                 }
4216                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4217                         /* hit the max of parameters already sorry.. */
4218                         break;
4219                 }
4220                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4221                         struct sctp_stream_reset_out_request *req_out;
4222
4223                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4224                                 break;
4225                         }
4226                         req_out = (struct sctp_stream_reset_out_request *)ph;
4227                         num_req++;
4228                         if (stcb->asoc.stream_reset_outstanding) {
4229                                 seq = ntohl(req_out->response_seq);
4230                                 if (seq == stcb->asoc.str_reset_seq_out) {
4231                                         /* implicit ack */
4232                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4233                                 }
4234                         }
4235                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4236                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4237                         struct sctp_stream_reset_add_strm *str_add;
4238
4239                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4240                                 break;
4241                         }
4242                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4243                         num_req++;
4244                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4245                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4246                         struct sctp_stream_reset_add_strm *str_add;
4247
4248                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4249                                 break;
4250                         }
4251                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4252                         num_req++;
4253                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4254                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4255                         struct sctp_stream_reset_in_request *req_in;
4256
4257                         num_req++;
4258                         req_in = (struct sctp_stream_reset_in_request *)ph;
4259                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4260                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4261                         struct sctp_stream_reset_tsn_request *req_tsn;
4262
4263                         num_req++;
4264                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4265                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4266                                 ret_code = 1;
4267                                 goto strres_nochunk;
4268                         }
4269                         /* no more */
4270                         break;
4271                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4272                         struct sctp_stream_reset_response *resp;
4273                         uint32_t result;
4274
4275                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4276                                 break;
4277                         }
4278                         resp = (struct sctp_stream_reset_response *)ph;
4279                         seq = ntohl(resp->response_seq);
4280                         result = ntohl(resp->result);
4281                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4282                                 ret_code = 1;
4283                                 goto strres_nochunk;
4284                         }
4285                 } else {
4286                         break;
4287                 }
4288                 offset += SCTP_SIZE32(param_len);
4289                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4290                         remaining_length -= SCTP_SIZE32(param_len);
4291                 } else {
4292                         remaining_length = 0;
4293                 }
4294         }
4295         if (num_req == 0) {
4296                 /* we have no response free the stuff */
4297                 goto strres_nochunk;
4298         }
4299         /* ok we have a chunk to link in */
4300         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4301             chk,
4302             sctp_next);
4303         stcb->asoc.ctrl_queue_cnt++;
4304         return (ret_code);
4305 }
4306
4307 /*
4308  * Handle a router or endpoints report of a packet loss, there are two ways
4309  * to handle this, either we get the whole packet and must disect it
4310  * ourselves (possibly with truncation and or corruption) or it is a summary
4311  * from a middle box that did the disectting for us.
4312  */
4313 static void
4314 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4315     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4316 {
4317         uint32_t bottle_bw, on_queue;
4318         uint16_t trunc_len;
4319         unsigned int chlen;
4320         unsigned int at;
4321         struct sctp_chunk_desc desc;
4322         struct sctp_chunkhdr *ch;
4323
4324         chlen = ntohs(cp->ch.chunk_length);
4325         chlen -= sizeof(struct sctp_pktdrop_chunk);
4326         /* XXX possible chlen underflow */
4327         if (chlen == 0) {
4328                 ch = NULL;
4329                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4330                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4331         } else {
4332                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4333                 chlen -= sizeof(struct sctphdr);
4334                 /* XXX possible chlen underflow */
4335                 memset(&desc, 0, sizeof(desc));
4336         }
4337         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4338         if (trunc_len > limit) {
4339                 trunc_len = limit;
4340         }
4341         /* now the chunks themselves */
4342         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4343                 desc.chunk_type = ch->chunk_type;
4344                 /* get amount we need to move */
4345                 at = ntohs(ch->chunk_length);
4346                 if (at < sizeof(struct sctp_chunkhdr)) {
4347                         /* corrupt chunk, maybe at the end? */
4348                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4349                         break;
4350                 }
4351                 if (trunc_len == 0) {
4352                         /* we are supposed to have all of it */
4353                         if (at > chlen) {
4354                                 /* corrupt skip it */
4355                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4356                                 break;
4357                         }
4358                 } else {
4359                         /* is there enough of it left ? */
4360                         if (desc.chunk_type == SCTP_DATA) {
4361                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4362                                     sizeof(desc.data_bytes))) {
4363                                         break;
4364                                 }
4365                         } else {
4366                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4367                                         break;
4368                                 }
4369                         }
4370                 }
4371                 if (desc.chunk_type == SCTP_DATA) {
4372                         /* can we get out the tsn? */
4373                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4374                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4375
4376                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4377                                 /* yep */
4378                                 struct sctp_data_chunk *dcp;
4379                                 uint8_t *ddp;
4380                                 unsigned int iii;
4381
4382                                 dcp = (struct sctp_data_chunk *)ch;
4383                                 ddp = (uint8_t *) (dcp + 1);
4384                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4385                                         desc.data_bytes[iii] = ddp[iii];
4386                                 }
4387                                 desc.tsn_ifany = dcp->dp.tsn;
4388                         } else {
4389                                 /* nope we are done. */
4390                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4391                                 break;
4392                         }
4393                 } else {
4394                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4395                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4396                 }
4397
4398                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4399                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4400                         break;
4401                 }
4402                 if (SCTP_SIZE32(at) > chlen) {
4403                         break;
4404                 }
4405                 chlen -= SCTP_SIZE32(at);
4406                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4407                         /* done, none left */
4408                         break;
4409                 }
4410                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4411         }
4412         /* Now update any rwnd --- possibly */
4413         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4414                 /* From a peer, we get a rwnd report */
4415                 uint32_t a_rwnd;
4416
4417                 SCTP_STAT_INCR(sctps_pdrpfehos);
4418
4419                 bottle_bw = ntohl(cp->bottle_bw);
4420                 on_queue = ntohl(cp->current_onq);
4421                 if (bottle_bw && on_queue) {
4422                         /* a rwnd report is in here */
4423                         if (bottle_bw > on_queue)
4424                                 a_rwnd = bottle_bw - on_queue;
4425                         else
4426                                 a_rwnd = 0;
4427
4428                         if (a_rwnd == 0)
4429                                 stcb->asoc.peers_rwnd = 0;
4430                         else {
4431                                 if (a_rwnd > stcb->asoc.total_flight) {
4432                                         stcb->asoc.peers_rwnd =
4433                                             a_rwnd - stcb->asoc.total_flight;
4434                                 } else {
4435                                         stcb->asoc.peers_rwnd = 0;
4436                                 }
4437                                 if (stcb->asoc.peers_rwnd <
4438                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4439                                         /* SWS sender side engages */
4440                                         stcb->asoc.peers_rwnd = 0;
4441                                 }
4442                         }
4443                 }
4444         } else {
4445                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4446         }
4447
4448         /* now middle boxes in sat networks get a cwnd bump */
4449         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4450             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4451             (stcb->asoc.sat_network)) {
4452                 /*
4453                  * This is debateable but for sat networks it makes sense
4454                  * Note if a T3 timer has went off, we will prohibit any
4455                  * changes to cwnd until we exit the t3 loss recovery.
4456                  */
4457                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4458                     net, cp, &bottle_bw, &on_queue);
4459         }
4460 }
4461
4462 /*
4463  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4464  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4465  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4466  * length of the complete packet outputs: - length: modified to remaining
4467  * length after control processing - netp: modified to new sctp_nets after
4468  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4469  * bad packet,...) otherwise return the tcb for this packet
4470  */
4471 #ifdef __GNUC__
4472 __attribute__((noinline))
4473 #endif
4474         static struct sctp_tcb *
4475                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4476              struct sockaddr *src, struct sockaddr *dst,
4477              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4478              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4479              uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4480              uint32_t vrf_id, uint16_t port)
4481 {
4482         struct sctp_association *asoc;
4483         struct mbuf *op_err;
4484         char msg[SCTP_DIAG_INFO_LEN];
4485         uint32_t vtag_in;
4486         int num_chunks = 0;     /* number of control chunks processed */
4487         uint32_t chk_length;
4488         int ret;
4489         int abort_no_unlock = 0;
4490         int ecne_seen = 0;
4491
4492         /*
4493          * How big should this be, and should it be alloc'd? Lets try the
4494          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4495          * until we get into jumbo grams and such..
4496          */
4497         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4498         struct sctp_tcb *locked_tcb = stcb;
4499         int got_auth = 0;
4500         uint32_t auth_offset = 0, auth_len = 0;
4501         int auth_skipped = 0;
4502         int asconf_cnt = 0;
4503
4504 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4505         struct socket *so;
4506
4507 #endif
4508
4509         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4510             iphlen, *offset, length, (void *)stcb);
4511
4512         /* validate chunk header length... */
4513         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4514                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4515                     ntohs(ch->chunk_length));
4516                 if (locked_tcb) {
4517                         SCTP_TCB_UNLOCK(locked_tcb);
4518                 }
4519                 return (NULL);
4520         }
4521         /*
4522          * validate the verification tag
4523          */
4524         vtag_in = ntohl(sh->v_tag);
4525
4526         if (locked_tcb) {
4527                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4528         }
4529         if (ch->chunk_type == SCTP_INITIATION) {
4530                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4531                     ntohs(ch->chunk_length), vtag_in);
4532                 if (vtag_in != 0) {
4533                         /* protocol error- silently discard... */
4534                         SCTP_STAT_INCR(sctps_badvtag);
4535                         if (locked_tcb) {
4536                                 SCTP_TCB_UNLOCK(locked_tcb);
4537                         }
4538                         return (NULL);
4539                 }
4540         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4541                 /*
4542                  * If there is no stcb, skip the AUTH chunk and process
4543                  * later after a stcb is found (to validate the lookup was
4544                  * valid.
4545                  */
4546                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4547                     (stcb == NULL) &&
4548                     (inp->auth_supported == 1)) {
4549                         /* save this chunk for later processing */
4550                         auth_skipped = 1;
4551                         auth_offset = *offset;
4552                         auth_len = ntohs(ch->chunk_length);
4553
4554                         /* (temporarily) move past this chunk */
4555                         *offset += SCTP_SIZE32(auth_len);
4556                         if (*offset >= length) {
4557                                 /* no more data left in the mbuf chain */
4558                                 *offset = length;
4559                                 if (locked_tcb) {
4560                                         SCTP_TCB_UNLOCK(locked_tcb);
4561                                 }
4562                                 return (NULL);
4563                         }
4564                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4565                             sizeof(struct sctp_chunkhdr), chunk_buf);
4566                 }
4567                 if (ch == NULL) {
4568                         /* Help */
4569                         *offset = length;
4570                         if (locked_tcb) {
4571                                 SCTP_TCB_UNLOCK(locked_tcb);
4572                         }
4573                         return (NULL);
4574                 }
4575                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4576                         goto process_control_chunks;
4577                 }
4578                 /*
4579                  * first check if it's an ASCONF with an unknown src addr we
4580                  * need to look inside to find the association
4581                  */
4582                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4583                         struct sctp_chunkhdr *asconf_ch = ch;
4584                         uint32_t asconf_offset = 0, asconf_len = 0;
4585
4586                         /* inp's refcount may be reduced */
4587                         SCTP_INP_INCR_REF(inp);
4588
4589                         asconf_offset = *offset;
4590                         do {
4591                                 asconf_len = ntohs(asconf_ch->chunk_length);
4592                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4593                                         break;
4594                                 stcb = sctp_findassociation_ep_asconf(m,
4595                                     *offset,
4596                                     dst,
4597                                     sh, &inp, netp, vrf_id);
4598                                 if (stcb != NULL)
4599                                         break;
4600                                 asconf_offset += SCTP_SIZE32(asconf_len);
4601                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4602                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4603                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4604                         if (stcb == NULL) {
4605                                 /*
4606                                  * reduce inp's refcount if not reduced in
4607                                  * sctp_findassociation_ep_asconf().
4608                                  */
4609                                 SCTP_INP_DECR_REF(inp);
4610                         } else {
4611                                 locked_tcb = stcb;
4612                         }
4613
4614                         /* now go back and verify any auth chunk to be sure */
4615                         if (auth_skipped && (stcb != NULL)) {
4616                                 struct sctp_auth_chunk *auth;
4617
4618                                 auth = (struct sctp_auth_chunk *)
4619                                     sctp_m_getptr(m, auth_offset,
4620                                     auth_len, chunk_buf);
4621                                 got_auth = 1;
4622                                 auth_skipped = 0;
4623                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4624                                     auth_offset)) {
4625                                         /* auth HMAC failed so dump it */
4626                                         *offset = length;
4627                                         if (locked_tcb) {
4628                                                 SCTP_TCB_UNLOCK(locked_tcb);
4629                                         }
4630                                         return (NULL);
4631                                 } else {
4632                                         /* remaining chunks are HMAC checked */
4633                                         stcb->asoc.authenticated = 1;
4634                                 }
4635                         }
4636                 }
4637                 if (stcb == NULL) {
4638                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4639                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4640                             msg);
4641                         /* no association, so it's out of the blue... */
4642                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4643                             mflowtype, mflowid, inp->fibnum,
4644                             vrf_id, port);
4645                         *offset = length;
4646                         if (locked_tcb) {
4647                                 SCTP_TCB_UNLOCK(locked_tcb);
4648                         }
4649                         return (NULL);
4650                 }
4651                 asoc = &stcb->asoc;
4652                 /* ABORT and SHUTDOWN can use either v_tag... */
4653                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4654                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4655                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4656                         /* Take the T-bit always into account. */
4657                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4658                             (vtag_in == asoc->my_vtag)) ||
4659                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4660                             (vtag_in == asoc->peer_vtag))) {
4661                                 /* this is valid */
4662                         } else {
4663                                 /* drop this packet... */
4664                                 SCTP_STAT_INCR(sctps_badvtag);
4665                                 if (locked_tcb) {
4666                                         SCTP_TCB_UNLOCK(locked_tcb);
4667                                 }
4668                                 return (NULL);
4669                         }
4670                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4671                         if (vtag_in != asoc->my_vtag) {
4672                                 /*
4673                                  * this could be a stale SHUTDOWN-ACK or the
4674                                  * peer never got the SHUTDOWN-COMPLETE and
4675                                  * is still hung; we have started a new asoc
4676                                  * but it won't complete until the shutdown
4677                                  * is completed
4678                                  */
4679                                 if (locked_tcb) {
4680                                         SCTP_TCB_UNLOCK(locked_tcb);
4681                                 }
4682                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4683                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4684                                     msg);
4685                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4686                                     sh, inp, op_err,
4687                                     mflowtype, mflowid, fibnum,
4688                                     vrf_id, port);
4689                                 return (NULL);
4690                         }
4691                 } else {
4692                         /* for all other chunks, vtag must match */
4693                         if (vtag_in != asoc->my_vtag) {
4694                                 /* invalid vtag... */
4695                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4696                                     "invalid vtag: %xh, expect %xh\n",
4697                                     vtag_in, asoc->my_vtag);
4698                                 SCTP_STAT_INCR(sctps_badvtag);
4699                                 if (locked_tcb) {
4700                                         SCTP_TCB_UNLOCK(locked_tcb);
4701                                 }
4702                                 *offset = length;
4703                                 return (NULL);
4704                         }
4705                 }
4706         }                       /* end if !SCTP_COOKIE_ECHO */
4707         /*
4708          * process all control chunks...
4709          */
4710         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4711             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4712             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4713             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4714                 /* implied cookie-ack.. we must have lost the ack */
4715                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4716                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4717                             stcb->asoc.overall_error_count,
4718                             0,
4719                             SCTP_FROM_SCTP_INPUT,
4720                             __LINE__);
4721                 }
4722                 stcb->asoc.overall_error_count = 0;
4723                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4724                     *netp);
4725         }
4726 process_control_chunks:
4727         while (IS_SCTP_CONTROL(ch)) {
4728                 /* validate chunk length */
4729                 chk_length = ntohs(ch->chunk_length);
4730                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4731                     ch->chunk_type, chk_length);
4732                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4733                 if (chk_length < sizeof(*ch) ||
4734                     (*offset + (int)chk_length) > length) {
4735                         *offset = length;
4736                         if (locked_tcb) {
4737                                 SCTP_TCB_UNLOCK(locked_tcb);
4738                         }
4739                         return (NULL);
4740                 }
4741                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4742                 /*
4743                  * INIT-ACK only gets the init ack "header" portion only
4744                  * because we don't have to process the peer's COOKIE. All
4745                  * others get a complete chunk.
4746                  */
4747                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4748                     (ch->chunk_type == SCTP_INITIATION)) {
4749                         /* get an init-ack chunk */
4750                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4751                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4752                         if (ch == NULL) {
4753                                 *offset = length;
4754                                 if (locked_tcb) {
4755                                         SCTP_TCB_UNLOCK(locked_tcb);
4756                                 }
4757                                 return (NULL);
4758                         }
4759                 } else {
4760                         /* For cookies and all other chunks. */
4761                         if (chk_length > sizeof(chunk_buf)) {
4762                                 /*
4763                                  * use just the size of the chunk buffer so
4764                                  * the front part of our chunks fit in
4765                                  * contiguous space up to the chunk buffer
4766                                  * size (508 bytes). For chunks that need to
4767                                  * get more than that they must use the
4768                                  * sctp_m_getptr() function or other means
4769                                  * (e.g. know how to parse mbuf chains).
4770                                  * Cookies do this already.
4771                                  */
4772                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4773                                     (sizeof(chunk_buf) - 4),
4774                                     chunk_buf);
4775                                 if (ch == NULL) {
4776                                         *offset = length;
4777                                         if (locked_tcb) {
4778                                                 SCTP_TCB_UNLOCK(locked_tcb);
4779                                         }
4780                                         return (NULL);
4781                                 }
4782                         } else {
4783                                 /* We can fit it all */
4784                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4785                                     chk_length, chunk_buf);
4786                                 if (ch == NULL) {
4787                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4788                                         *offset = length;
4789                                         if (locked_tcb) {
4790                                                 SCTP_TCB_UNLOCK(locked_tcb);
4791                                         }
4792                                         return (NULL);
4793                                 }
4794                         }
4795                 }
4796                 num_chunks++;
4797                 /* Save off the last place we got a control from */
4798                 if (stcb != NULL) {
4799                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4800                                 /*
4801                                  * allow last_control to be NULL if
4802                                  * ASCONF... ASCONF processing will find the
4803                                  * right net later
4804                                  */
4805                                 if ((netp != NULL) && (*netp != NULL))
4806                                         stcb->asoc.last_control_chunk_from = *netp;
4807                         }
4808                 }
4809 #ifdef SCTP_AUDITING_ENABLED
4810                 sctp_audit_log(0xB0, ch->chunk_type);
4811 #endif
4812
4813                 /* check to see if this chunk required auth, but isn't */
4814                 if ((stcb != NULL) &&
4815                     (stcb->asoc.auth_supported == 1) &&
4816                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4817                     !stcb->asoc.authenticated) {
4818                         /* "silently" ignore */
4819                         SCTP_STAT_INCR(sctps_recvauthmissing);
4820                         goto next_chunk;
4821                 }
4822                 switch (ch->chunk_type) {
4823                 case SCTP_INITIATION:
4824                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4825                         /* The INIT chunk must be the only chunk. */
4826                         if ((num_chunks > 1) ||
4827                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4828                                 /* RFC 4960 requires that no ABORT is sent */
4829                                 *offset = length;
4830                                 if (locked_tcb) {
4831                                         SCTP_TCB_UNLOCK(locked_tcb);
4832                                 }
4833                                 return (NULL);
4834                         }
4835                         /* Honor our resource limit. */
4836                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4837                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4838                                 sctp_abort_association(inp, stcb, m, iphlen,
4839                                     src, dst, sh, op_err,
4840                                     mflowtype, mflowid,
4841                                     vrf_id, port);
4842                                 *offset = length;
4843                                 return (NULL);
4844                         }
4845                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4846                             (struct sctp_init_chunk *)ch, inp,
4847                             stcb, *netp, &abort_no_unlock,
4848                             mflowtype, mflowid,
4849                             vrf_id, port);
4850                         *offset = length;
4851                         if ((!abort_no_unlock) && (locked_tcb)) {
4852                                 SCTP_TCB_UNLOCK(locked_tcb);
4853                         }
4854                         return (NULL);
4855                         break;
4856                 case SCTP_PAD_CHUNK:
4857                         break;
4858                 case SCTP_INITIATION_ACK:
4859                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4860                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4861                                 /* We are not interested anymore */
4862                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4863                                         ;
4864                                 } else {
4865                                         if ((locked_tcb != NULL) && (locked_tcb != stcb)) {
4866                                                 /* Very unlikely */
4867                                                 SCTP_TCB_UNLOCK(locked_tcb);
4868                                         }
4869                                         *offset = length;
4870                                         if (stcb) {
4871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4872                                                 so = SCTP_INP_SO(inp);
4873                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4874                                                 SCTP_TCB_UNLOCK(stcb);
4875                                                 SCTP_SOCKET_LOCK(so, 1);
4876                                                 SCTP_TCB_LOCK(stcb);
4877                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4878 #endif
4879                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4880                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4881 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4882                                                 SCTP_SOCKET_UNLOCK(so, 1);
4883 #endif
4884                                         }
4885                                         return (NULL);
4886                                 }
4887                         }
4888                         /* The INIT-ACK chunk must be the only chunk. */
4889                         if ((num_chunks > 1) ||
4890                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4891                                 *offset = length;
4892                                 if (locked_tcb) {
4893                                         SCTP_TCB_UNLOCK(locked_tcb);
4894                                 }
4895                                 return (NULL);
4896                         }
4897                         if ((netp) && (*netp)) {
4898                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4899                                     src, dst, sh,
4900                                     (struct sctp_init_ack_chunk *)ch,
4901                                     stcb, *netp,
4902                                     &abort_no_unlock,
4903                                     mflowtype, mflowid,
4904                                     vrf_id);
4905                         } else {
4906                                 ret = -1;
4907                         }
4908                         *offset = length;
4909                         if (abort_no_unlock) {
4910                                 return (NULL);
4911                         }
4912                         /*
4913                          * Special case, I must call the output routine to
4914                          * get the cookie echoed
4915                          */
4916                         if ((stcb != NULL) && (ret == 0)) {
4917                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4918                         }
4919                         if (locked_tcb) {
4920                                 SCTP_TCB_UNLOCK(locked_tcb);
4921                         }
4922                         return (NULL);
4923                         break;
4924                 case SCTP_SELECTIVE_ACK:
4925                         {
4926                                 struct sctp_sack_chunk *sack;
4927                                 int abort_now = 0;
4928                                 uint32_t a_rwnd, cum_ack;
4929                                 uint16_t num_seg, num_dup;
4930                                 uint8_t flags;
4931                                 int offset_seg, offset_dup;
4932
4933                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4934                                 SCTP_STAT_INCR(sctps_recvsacks);
4935                                 if (stcb == NULL) {
4936                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4937                                         break;
4938                                 }
4939                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4940                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4941                                         break;
4942                                 }
4943                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4944                                         /*-
4945                                          * If we have sent a shutdown-ack, we will pay no
4946                                          * attention to a sack sent in to us since
4947                                          * we don't care anymore.
4948                                          */
4949                                         break;
4950                                 }
4951                                 sack = (struct sctp_sack_chunk *)ch;
4952                                 flags = ch->chunk_flags;
4953                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4954                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4955                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4956                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4957                                 if (sizeof(struct sctp_sack_chunk) +
4958                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4959                                     num_dup * sizeof(uint32_t) != chk_length) {
4960                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4961                                         break;
4962                                 }
4963                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4964                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4965                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4966                                     cum_ack, num_seg, a_rwnd);
4967                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4968                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4969                                     (num_seg == 0) &&
4970                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4971                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4972                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4973                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4974                                     ) {
4975                                         /*
4976                                          * We have a SIMPLE sack having no
4977                                          * prior segments and data on sent
4978                                          * queue to be acked.. Use the
4979                                          * faster path sack processing. We
4980                                          * also allow window update sacks
4981                                          * with no missing segments to go
4982                                          * this way too.
4983                                          */
4984                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4985                                 } else {
4986                                         if (netp && *netp)
4987                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4988                                                     num_seg, 0, num_dup, &abort_now, flags,
4989                                                     cum_ack, a_rwnd, ecne_seen);
4990                                 }
4991                                 if (abort_now) {
4992                                         /* ABORT signal from sack processing */
4993                                         *offset = length;
4994                                         return (NULL);
4995                                 }
4996                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4997                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4998                                     (stcb->asoc.stream_queue_cnt == 0)) {
4999                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5000                                 }
5001                         }
5002                         break;
5003                         /*
5004                          * EY - nr_sack:  If the received chunk is an
5005                          * nr_sack chunk
5006                          */
5007                 case SCTP_NR_SELECTIVE_ACK:
5008                         {
5009                                 struct sctp_nr_sack_chunk *nr_sack;
5010                                 int abort_now = 0;
5011                                 uint32_t a_rwnd, cum_ack;
5012                                 uint16_t num_seg, num_nr_seg, num_dup;
5013                                 uint8_t flags;
5014                                 int offset_seg, offset_dup;
5015
5016                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
5017                                 SCTP_STAT_INCR(sctps_recvsacks);
5018                                 if (stcb == NULL) {
5019                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
5020                                         break;
5021                                 }
5022                                 if (stcb->asoc.nrsack_supported == 0) {
5023                                         goto unknown_chunk;
5024                                 }
5025                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5026                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
5027                                         break;
5028                                 }
5029                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5030                                         /*-
5031                                          * If we have sent a shutdown-ack, we will pay no
5032                                          * attention to a sack sent in to us since
5033                                          * we don't care anymore.
5034                                          */
5035                                         break;
5036                                 }
5037                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5038                                 flags = ch->chunk_flags;
5039                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5040                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5041                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5042                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5043                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
5044                                 if (sizeof(struct sctp_nr_sack_chunk) +
5045                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5046                                     num_dup * sizeof(uint32_t) != chk_length) {
5047                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5048                                         break;
5049                                 }
5050                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5051                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5052                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5053                                     cum_ack, num_seg, a_rwnd);
5054                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5055                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5056                                     (num_seg == 0) && (num_nr_seg == 0) &&
5057                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5058                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5059                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5060                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5061                                         /*
5062                                          * We have a SIMPLE sack having no
5063                                          * prior segments and data on sent
5064                                          * queue to be acked. Use the faster
5065                                          * path sack processing. We also
5066                                          * allow window update sacks with no
5067                                          * missing segments to go this way
5068                                          * too.
5069                                          */
5070                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5071                                             &abort_now, ecne_seen);
5072                                 } else {
5073                                         if (netp && *netp)
5074                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5075                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5076                                                     cum_ack, a_rwnd, ecne_seen);
5077                                 }
5078                                 if (abort_now) {
5079                                         /* ABORT signal from sack processing */
5080                                         *offset = length;
5081                                         return (NULL);
5082                                 }
5083                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5084                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5085                                     (stcb->asoc.stream_queue_cnt == 0)) {
5086                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5087                                 }
5088                         }
5089                         break;
5090
5091                 case SCTP_HEARTBEAT_REQUEST:
5092                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5093                         if ((stcb) && netp && *netp) {
5094                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5095                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5096                                     chk_length, *netp);
5097
5098                                 /* He's alive so give him credit */
5099                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5100                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5101                                             stcb->asoc.overall_error_count,
5102                                             0,
5103                                             SCTP_FROM_SCTP_INPUT,
5104                                             __LINE__);
5105                                 }
5106                                 stcb->asoc.overall_error_count = 0;
5107                         }
5108                         break;
5109                 case SCTP_HEARTBEAT_ACK:
5110                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5111                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5112                                 /* Its not ours */
5113                                 *offset = length;
5114                                 if (locked_tcb) {
5115                                         SCTP_TCB_UNLOCK(locked_tcb);
5116                                 }
5117                                 return (NULL);
5118                         }
5119                         /* He's alive so give him credit */
5120                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5121                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5122                                     stcb->asoc.overall_error_count,
5123                                     0,
5124                                     SCTP_FROM_SCTP_INPUT,
5125                                     __LINE__);
5126                         }
5127                         stcb->asoc.overall_error_count = 0;
5128                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5129                         if (netp && *netp)
5130                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5131                                     stcb, *netp);
5132                         break;
5133                 case SCTP_ABORT_ASSOCIATION:
5134                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5135                             (void *)stcb);
5136                         if ((stcb) && netp && *netp)
5137                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5138                                     stcb, *netp);
5139                         *offset = length;
5140                         return (NULL);
5141                         break;
5142                 case SCTP_SHUTDOWN:
5143                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5144                             (void *)stcb);
5145                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5146                                 *offset = length;
5147                                 if (locked_tcb) {
5148                                         SCTP_TCB_UNLOCK(locked_tcb);
5149                                 }
5150                                 return (NULL);
5151                         }
5152                         if (netp && *netp) {
5153                                 int abort_flag = 0;
5154
5155                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5156                                     stcb, *netp, &abort_flag);
5157                                 if (abort_flag) {
5158                                         *offset = length;
5159                                         return (NULL);
5160                                 }
5161                         }
5162                         break;
5163                 case SCTP_SHUTDOWN_ACK:
5164                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5165                         if ((stcb) && (netp) && (*netp))
5166                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5167                         *offset = length;
5168                         return (NULL);
5169                         break;
5170
5171                 case SCTP_OPERATION_ERROR:
5172                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5173                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5174                                 *offset = length;
5175                                 return (NULL);
5176                         }
5177                         break;
5178                 case SCTP_COOKIE_ECHO:
5179                         SCTPDBG(SCTP_DEBUG_INPUT3,
5180                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5181                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5182                                 ;
5183                         } else {
5184                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5185                                         /* We are not interested anymore */
5186                         abend:
5187                                         if (stcb) {
5188                                                 SCTP_TCB_UNLOCK(stcb);
5189                                         }
5190                                         *offset = length;
5191                                         return (NULL);
5192                                 }
5193                         }
5194                         /*
5195                          * First are we accepting? We do this again here
5196                          * since it is possible that a previous endpoint WAS
5197                          * listening responded to a INIT-ACK and then
5198                          * closed. We opened and bound.. and are now no
5199                          * longer listening.
5200                          */
5201
5202                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5203                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5204                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5205                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5206                                         sctp_abort_association(inp, stcb, m, iphlen,
5207                                             src, dst, sh, op_err,
5208                                             mflowtype, mflowid,
5209                                             vrf_id, port);
5210                                 }
5211                                 *offset = length;
5212                                 return (NULL);
5213                         } else {
5214                                 struct mbuf *ret_buf;
5215                                 struct sctp_inpcb *linp;
5216
5217                                 if (stcb) {
5218                                         linp = NULL;
5219                                 } else {
5220                                         linp = inp;
5221                                 }
5222
5223                                 if (linp) {
5224                                         SCTP_ASOC_CREATE_LOCK(linp);
5225                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5226                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5227                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5228                                                 goto abend;
5229                                         }
5230                                 }
5231                                 if (netp) {
5232                                         ret_buf =
5233                                             sctp_handle_cookie_echo(m, iphlen,
5234                                             *offset,
5235                                             src, dst,
5236                                             sh,
5237                                             (struct sctp_cookie_echo_chunk *)ch,
5238                                             &inp, &stcb, netp,
5239                                             auth_skipped,
5240                                             auth_offset,
5241                                             auth_len,
5242                                             &locked_tcb,
5243                                             mflowtype,
5244                                             mflowid,
5245                                             vrf_id,
5246                                             port);
5247                                 } else {
5248                                         ret_buf = NULL;
5249                                 }
5250                                 if (linp) {
5251                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5252                                 }
5253                                 if (ret_buf == NULL) {
5254                                         if (locked_tcb) {
5255                                                 SCTP_TCB_UNLOCK(locked_tcb);
5256                                         }
5257                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5258                                             "GAK, null buffer\n");
5259                                         *offset = length;
5260                                         return (NULL);
5261                                 }
5262                                 /* if AUTH skipped, see if it verified... */
5263                                 if (auth_skipped) {
5264                                         got_auth = 1;
5265                                         auth_skipped = 0;
5266                                 }
5267                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5268                                         /*
5269                                          * Restart the timer if we have
5270                                          * pending data
5271                                          */
5272                                         struct sctp_tmit_chunk *chk;
5273
5274                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5275                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5276                                 }
5277                         }
5278                         break;
5279                 case SCTP_COOKIE_ACK:
5280                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5281                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5282                                 if (locked_tcb) {
5283                                         SCTP_TCB_UNLOCK(locked_tcb);
5284                                 }
5285                                 return (NULL);
5286                         }
5287                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5288                                 /* We are not interested anymore */
5289                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5290                                         ;
5291                                 } else if (stcb) {
5292 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5293                                         so = SCTP_INP_SO(inp);
5294                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5295                                         SCTP_TCB_UNLOCK(stcb);
5296                                         SCTP_SOCKET_LOCK(so, 1);
5297                                         SCTP_TCB_LOCK(stcb);
5298                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5299 #endif
5300                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5301                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5302 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5303                                         SCTP_SOCKET_UNLOCK(so, 1);
5304 #endif
5305                                         *offset = length;
5306                                         return (NULL);
5307                                 }
5308                         }
5309                         /* He's alive so give him credit */
5310                         if ((stcb) && netp && *netp) {
5311                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5312                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5313                                             stcb->asoc.overall_error_count,
5314                                             0,
5315                                             SCTP_FROM_SCTP_INPUT,
5316                                             __LINE__);
5317                                 }
5318                                 stcb->asoc.overall_error_count = 0;
5319                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5320                         }
5321                         break;
5322                 case SCTP_ECN_ECHO:
5323                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5324                         /* He's alive so give him credit */
5325                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5326                                 /* Its not ours */
5327                                 if (locked_tcb) {
5328                                         SCTP_TCB_UNLOCK(locked_tcb);
5329                                 }
5330                                 *offset = length;
5331                                 return (NULL);
5332                         }
5333                         if (stcb) {
5334                                 if (stcb->asoc.ecn_supported == 0) {
5335                                         goto unknown_chunk;
5336                                 }
5337                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5338                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5339                                             stcb->asoc.overall_error_count,
5340                                             0,
5341                                             SCTP_FROM_SCTP_INPUT,
5342                                             __LINE__);
5343                                 }
5344                                 stcb->asoc.overall_error_count = 0;
5345                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5346                                     stcb);
5347                                 ecne_seen = 1;
5348                         }
5349                         break;
5350                 case SCTP_ECN_CWR:
5351                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5352                         /* He's alive so give him credit */
5353                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5354                                 /* Its not ours */
5355                                 if (locked_tcb) {
5356                                         SCTP_TCB_UNLOCK(locked_tcb);
5357                                 }
5358                                 *offset = length;
5359                                 return (NULL);
5360                         }
5361                         if (stcb) {
5362                                 if (stcb->asoc.ecn_supported == 0) {
5363                                         goto unknown_chunk;
5364                                 }
5365                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5366                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5367                                             stcb->asoc.overall_error_count,
5368                                             0,
5369                                             SCTP_FROM_SCTP_INPUT,
5370                                             __LINE__);
5371                                 }
5372                                 stcb->asoc.overall_error_count = 0;
5373                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5374                         }
5375                         break;
5376                 case SCTP_SHUTDOWN_COMPLETE:
5377                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5378                         /* must be first and only chunk */
5379                         if ((num_chunks > 1) ||
5380                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5381                                 *offset = length;
5382                                 if (locked_tcb) {
5383                                         SCTP_TCB_UNLOCK(locked_tcb);
5384                                 }
5385                                 return (NULL);
5386                         }
5387                         if ((stcb) && netp && *netp) {
5388                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5389                                     stcb, *netp);
5390                         }
5391                         *offset = length;
5392                         return (NULL);
5393                         break;
5394                 case SCTP_ASCONF:
5395                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5396                         /* He's alive so give him credit */
5397                         if (stcb) {
5398                                 if (stcb->asoc.asconf_supported == 0) {
5399                                         goto unknown_chunk;
5400                                 }
5401                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5402                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5403                                             stcb->asoc.overall_error_count,
5404                                             0,
5405                                             SCTP_FROM_SCTP_INPUT,
5406                                             __LINE__);
5407                                 }
5408                                 stcb->asoc.overall_error_count = 0;
5409                                 sctp_handle_asconf(m, *offset, src,
5410                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5411                                 asconf_cnt++;
5412                         }
5413                         break;
5414                 case SCTP_ASCONF_ACK:
5415                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5416                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5417                                 /* Its not ours */
5418                                 if (locked_tcb) {
5419                                         SCTP_TCB_UNLOCK(locked_tcb);
5420                                 }
5421                                 *offset = length;
5422                                 return (NULL);
5423                         }
5424                         if ((stcb) && netp && *netp) {
5425                                 if (stcb->asoc.asconf_supported == 0) {
5426                                         goto unknown_chunk;
5427                                 }
5428                                 /* He's alive so give him credit */
5429                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5430                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5431                                             stcb->asoc.overall_error_count,
5432                                             0,
5433                                             SCTP_FROM_SCTP_INPUT,
5434                                             __LINE__);
5435                                 }
5436                                 stcb->asoc.overall_error_count = 0;
5437                                 sctp_handle_asconf_ack(m, *offset,
5438                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5439                                 if (abort_no_unlock)
5440                                         return (NULL);
5441                         }
5442                         break;
5443                 case SCTP_FORWARD_CUM_TSN:
5444                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5445                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5446                                 /* Its not ours */
5447                                 if (locked_tcb) {
5448                                         SCTP_TCB_UNLOCK(locked_tcb);
5449                                 }
5450                                 *offset = length;
5451                                 return (NULL);
5452                         }
5453                         /* He's alive so give him credit */
5454                         if (stcb) {
5455                                 int abort_flag = 0;
5456
5457                                 if (stcb->asoc.prsctp_supported == 0) {
5458                                         goto unknown_chunk;
5459                                 }
5460                                 stcb->asoc.overall_error_count = 0;
5461                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5462                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5463                                             stcb->asoc.overall_error_count,
5464                                             0,
5465                                             SCTP_FROM_SCTP_INPUT,
5466                                             __LINE__);
5467                                 }
5468                                 *fwd_tsn_seen = 1;
5469                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5470                                         /* We are not interested anymore */
5471 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5472                                         so = SCTP_INP_SO(inp);
5473                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5474                                         SCTP_TCB_UNLOCK(stcb);
5475                                         SCTP_SOCKET_LOCK(so, 1);
5476                                         SCTP_TCB_LOCK(stcb);
5477                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5478 #endif
5479                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5480                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5481 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5482                                         SCTP_SOCKET_UNLOCK(so, 1);
5483 #endif
5484                                         *offset = length;
5485                                         return (NULL);
5486                                 }
5487                                 sctp_handle_forward_tsn(stcb,
5488                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5489                                 if (abort_flag) {
5490                                         *offset = length;
5491                                         return (NULL);
5492                                 } else {
5493                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5494                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5495                                                     stcb->asoc.overall_error_count,
5496                                                     0,
5497                                                     SCTP_FROM_SCTP_INPUT,
5498                                                     __LINE__);
5499                                         }
5500                                         stcb->asoc.overall_error_count = 0;
5501                                 }
5502
5503                         }
5504                         break;
5505                 case SCTP_STREAM_RESET:
5506                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5507                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5508                                 /* Its not ours */
5509                                 if (locked_tcb) {
5510                                         SCTP_TCB_UNLOCK(locked_tcb);
5511                                 }
5512                                 *offset = length;
5513                                 return (NULL);
5514                         }
5515                         if (stcb->asoc.reconfig_supported == 0) {
5516                                 goto unknown_chunk;
5517                         }
5518                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5519                                 /* stop processing */
5520                                 *offset = length;
5521                                 return (NULL);
5522                         }
5523                         break;
5524                 case SCTP_PACKET_DROPPED:
5525                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5526                         /* re-get it all please */
5527                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5528                                 /* Its not ours */
5529                                 if (locked_tcb) {
5530                                         SCTP_TCB_UNLOCK(locked_tcb);
5531                                 }
5532                                 *offset = length;
5533                                 return (NULL);
5534                         }
5535                         if (ch && (stcb) && netp && (*netp)) {
5536                                 if (stcb->asoc.pktdrop_supported == 0) {
5537                                         goto unknown_chunk;
5538                                 }
5539                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5540                                     stcb, *netp,
5541                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5542
5543                         }
5544                         break;
5545                 case SCTP_AUTHENTICATION:
5546                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5547                         if (stcb == NULL) {
5548                                 /* save the first AUTH for later processing */
5549                                 if (auth_skipped == 0) {
5550                                         auth_offset = *offset;
5551                                         auth_len = chk_length;
5552                                         auth_skipped = 1;
5553                                 }
5554                                 /* skip this chunk (temporarily) */
5555                                 goto next_chunk;
5556                         }
5557                         if (stcb->asoc.auth_supported == 0) {
5558                                 goto unknown_chunk;
5559                         }
5560                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5561                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5562                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5563                                 /* Its not ours */
5564                                 if (locked_tcb) {
5565                                         SCTP_TCB_UNLOCK(locked_tcb);
5566                                 }
5567                                 *offset = length;
5568                                 return (NULL);
5569                         }
5570                         if (got_auth == 1) {
5571                                 /* skip this chunk... it's already auth'd */
5572                                 goto next_chunk;
5573                         }
5574                         got_auth = 1;
5575                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5576                             m, *offset)) {
5577                                 /* auth HMAC failed so dump the packet */
5578                                 *offset = length;
5579                                 return (stcb);
5580                         } else {
5581                                 /* remaining chunks are HMAC checked */
5582                                 stcb->asoc.authenticated = 1;
5583                         }
5584                         break;
5585
5586                 default:
5587         unknown_chunk:
5588                         /* it's an unknown chunk! */
5589                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5590                                 struct sctp_gen_error_cause *cause;
5591                                 int len;
5592
5593                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5594                                     0, M_NOWAIT, 1, MT_DATA);
5595                                 if (op_err != NULL) {
5596                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5597                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5598                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5599                                         cause->length = htons(len + sizeof(struct sctp_gen_error_cause));
5600                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5601                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5602                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5603 #ifdef SCTP_MBUF_LOGGING
5604                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5605                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5606                                                 }
5607 #endif
5608                                                 sctp_queue_op_err(stcb, op_err);
5609                                         } else {
5610                                                 sctp_m_freem(op_err);
5611                                         }
5612                                 }
5613                         }
5614                         if ((ch->chunk_type & 0x80) == 0) {
5615                                 /* discard this packet */
5616                                 *offset = length;
5617                                 return (stcb);
5618                         }       /* else skip this bad chunk and continue... */
5619                         break;
5620                 }               /* switch (ch->chunk_type) */
5621
5622
5623 next_chunk:
5624                 /* get the next chunk */
5625                 *offset += SCTP_SIZE32(chk_length);
5626                 if (*offset >= length) {
5627                         /* no more data left in the mbuf chain */
5628                         break;
5629                 }
5630                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5631                     sizeof(struct sctp_chunkhdr), chunk_buf);
5632                 if (ch == NULL) {
5633                         if (locked_tcb) {
5634                                 SCTP_TCB_UNLOCK(locked_tcb);
5635                         }
5636                         *offset = length;
5637                         return (NULL);
5638                 }
5639         }                       /* while */
5640
5641         if (asconf_cnt > 0 && stcb != NULL) {
5642                 sctp_send_asconf_ack(stcb);
5643         }
5644         return (stcb);
5645 }
5646
5647
5648 /*
5649  * common input chunk processing (v4 and v6)
5650  */
5651 void
5652 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5653     struct sockaddr *src, struct sockaddr *dst,
5654     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5655 #if !defined(SCTP_WITH_NO_CSUM)
5656     uint8_t compute_crc,
5657 #endif
5658     uint8_t ecn_bits,
5659     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5660     uint32_t vrf_id, uint16_t port)
5661 {
5662         uint32_t high_tsn;
5663         int fwd_tsn_seen = 0, data_processed = 0;
5664         struct mbuf *m = *mm, *op_err;
5665         char msg[SCTP_DIAG_INFO_LEN];
5666         int un_sent;
5667         int cnt_ctrl_ready = 0;
5668         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5669         struct sctp_tcb *stcb = NULL;
5670         struct sctp_nets *net = NULL;
5671
5672         SCTP_STAT_INCR(sctps_recvdatagrams);
5673 #ifdef SCTP_AUDITING_ENABLED
5674         sctp_audit_log(0xE0, 1);
5675         sctp_auditing(0, inp, stcb, net);
5676 #endif
5677 #if !defined(SCTP_WITH_NO_CSUM)
5678         if (compute_crc != 0) {
5679                 uint32_t check, calc_check;
5680
5681                 check = sh->checksum;
5682                 sh->checksum = 0;
5683                 calc_check = sctp_calculate_cksum(m, iphlen);
5684                 sh->checksum = check;
5685                 if (calc_check != check) {
5686                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5687                             calc_check, check, (void *)m, length, iphlen);
5688                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5689                             sh, ch, &inp, &net, vrf_id);
5690 #if defined(INET) || defined(INET6)
5691                         if ((ch->chunk_type != SCTP_INITIATION) &&
5692                             (net != NULL) && (net->port != port)) {
5693                                 if (net->port == 0) {
5694                                         /* UDP encapsulation turned on. */
5695                                         net->mtu -= sizeof(struct udphdr);
5696                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5697                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5698                                         }
5699                                 } else if (port == 0) {
5700                                         /* UDP encapsulation turned off. */
5701                                         net->mtu += sizeof(struct udphdr);
5702                                         /* XXX Update smallest_mtu */
5703                                 }
5704                                 net->port = port;
5705                         }
5706 #endif
5707                         if (net != NULL) {
5708                                 net->flowtype = mflowtype;
5709                                 net->flowid = mflowid;
5710                         }
5711                         if ((inp != NULL) && (stcb != NULL)) {
5712                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5713                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5714                         } else if ((inp != NULL) && (stcb == NULL)) {
5715                                 inp_decr = inp;
5716                         }
5717                         SCTP_STAT_INCR(sctps_badsum);
5718                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5719                         goto out;
5720                 }
5721         }
5722 #endif
5723         /* Destination port of 0 is illegal, based on RFC4960. */
5724         if (sh->dest_port == 0) {
5725                 SCTP_STAT_INCR(sctps_hdrops);
5726                 goto out;
5727         }
5728         stcb = sctp_findassociation_addr(m, offset, src, dst,
5729             sh, ch, &inp, &net, vrf_id);
5730 #if defined(INET) || defined(INET6)
5731         if ((ch->chunk_type != SCTP_INITIATION) &&
5732             (net != NULL) && (net->port != port)) {
5733                 if (net->port == 0) {
5734                         /* UDP encapsulation turned on. */
5735                         net->mtu -= sizeof(struct udphdr);
5736                         if (stcb->asoc.smallest_mtu > net->mtu) {
5737                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5738                         }
5739                 } else if (port == 0) {
5740                         /* UDP encapsulation turned off. */
5741                         net->mtu += sizeof(struct udphdr);
5742                         /* XXX Update smallest_mtu */
5743                 }
5744                 net->port = port;
5745         }
5746 #endif
5747         if (net != NULL) {
5748                 net->flowtype = mflowtype;
5749                 net->flowid = mflowid;
5750         }
5751         if (inp == NULL) {
5752                 SCTP_STAT_INCR(sctps_noport);
5753                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5754                         goto out;
5755                 }
5756                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5757                         sctp_send_shutdown_complete2(src, dst, sh,
5758                             mflowtype, mflowid, fibnum,
5759                             vrf_id, port);
5760                         goto out;
5761                 }
5762                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5763                         goto out;
5764                 }
5765                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5766                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5767                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5768                             (ch->chunk_type != SCTP_INIT))) {
5769                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5770                                     "Out of the blue");
5771                                 sctp_send_abort(m, iphlen, src, dst,
5772                                     sh, 0, op_err,
5773                                     mflowtype, mflowid, fibnum,
5774                                     vrf_id, port);
5775                         }
5776                 }
5777                 goto out;
5778         } else if (stcb == NULL) {
5779                 inp_decr = inp;
5780         }
5781 #ifdef IPSEC
5782         /*-
5783          * I very much doubt any of the IPSEC stuff will work but I have no
5784          * idea, so I will leave it in place.
5785          */
5786         if (inp != NULL) {
5787                 switch (dst->sa_family) {
5788 #ifdef INET
5789                 case AF_INET:
5790                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5791                                 IPSECSTAT_INC(ips_in_polvio);
5792                                 SCTP_STAT_INCR(sctps_hdrops);
5793                                 goto out;
5794                         }
5795                         break;
5796 #endif
5797 #ifdef INET6
5798                 case AF_INET6:
5799                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5800                                 IPSEC6STAT_INC(ips_in_polvio);
5801                                 SCTP_STAT_INCR(sctps_hdrops);
5802                                 goto out;
5803                         }
5804                         break;
5805 #endif
5806                 default:
5807                         break;
5808                 }
5809         }
5810 #endif
5811         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5812             (void *)m, iphlen, offset, length, (void *)stcb);
5813         if (stcb) {
5814                 /* always clear this before beginning a packet */
5815                 stcb->asoc.authenticated = 0;
5816                 stcb->asoc.seen_a_sack_this_pkt = 0;
5817                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5818                     (void *)stcb, stcb->asoc.state);
5819
5820                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5821                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5822                         /*-
5823                          * If we hit here, we had a ref count
5824                          * up when the assoc was aborted and the
5825                          * timer is clearing out the assoc, we should
5826                          * NOT respond to any packet.. its OOTB.
5827                          */
5828                         SCTP_TCB_UNLOCK(stcb);
5829                         stcb = NULL;
5830                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5831                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5832                             msg);
5833                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5834                             mflowtype, mflowid, inp->fibnum,
5835                             vrf_id, port);
5836                         goto out;
5837                 }
5838         }
5839         if (IS_SCTP_CONTROL(ch)) {
5840                 /* process the control portion of the SCTP packet */
5841                 /* sa_ignore NO_NULL_CHK */
5842                 stcb = sctp_process_control(m, iphlen, &offset, length,
5843                     src, dst, sh, ch,
5844                     inp, stcb, &net, &fwd_tsn_seen,
5845                     mflowtype, mflowid, fibnum,
5846                     vrf_id, port);
5847                 if (stcb) {
5848                         /*
5849                          * This covers us if the cookie-echo was there and
5850                          * it changes our INP.
5851                          */
5852                         inp = stcb->sctp_ep;
5853 #if defined(INET) || defined(INET6)
5854                         if ((ch->chunk_type != SCTP_INITIATION) &&
5855                             (net != NULL) && (net->port != port)) {
5856                                 if (net->port == 0) {
5857                                         /* UDP encapsulation turned on. */
5858                                         net->mtu -= sizeof(struct udphdr);
5859                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5860                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5861                                         }
5862                                 } else if (port == 0) {
5863                                         /* UDP encapsulation turned off. */
5864                                         net->mtu += sizeof(struct udphdr);
5865                                         /* XXX Update smallest_mtu */
5866                                 }
5867                                 net->port = port;
5868                         }
5869 #endif
5870                 }
5871         } else {
5872                 /*
5873                  * no control chunks, so pre-process DATA chunks (these
5874                  * checks are taken care of by control processing)
5875                  */
5876
5877                 /*
5878                  * if DATA only packet, and auth is required, then punt...
5879                  * can't have authenticated without any AUTH (control)
5880                  * chunks
5881                  */
5882                 if ((stcb != NULL) &&
5883                     (stcb->asoc.auth_supported == 1) &&
5884                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5885                         /* "silently" ignore */
5886                         SCTP_STAT_INCR(sctps_recvauthmissing);
5887                         goto out;
5888                 }
5889                 if (stcb == NULL) {
5890                         /* out of the blue DATA chunk */
5891                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5892                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5893                             msg);
5894                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5895                             mflowtype, mflowid, fibnum,
5896                             vrf_id, port);
5897                         goto out;
5898                 }
5899                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5900                         /* v_tag mismatch! */
5901                         SCTP_STAT_INCR(sctps_badvtag);
5902                         goto out;
5903                 }
5904         }
5905
5906         if (stcb == NULL) {
5907                 /*
5908                  * no valid TCB for this packet, or we found it's a bad
5909                  * packet while processing control, or we're done with this
5910                  * packet (done or skip rest of data), so we drop it...
5911                  */
5912                 goto out;
5913         }
5914         /*
5915          * DATA chunk processing
5916          */
5917         /* plow through the data chunks while length > offset */
5918
5919         /*
5920          * Rest should be DATA only.  Check authentication state if AUTH for
5921          * DATA is required.
5922          */
5923         if ((length > offset) &&
5924             (stcb != NULL) &&
5925             (stcb->asoc.auth_supported == 1) &&
5926             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5927             !stcb->asoc.authenticated) {
5928                 /* "silently" ignore */
5929                 SCTP_STAT_INCR(sctps_recvauthmissing);
5930                 SCTPDBG(SCTP_DEBUG_AUTH1,
5931                     "Data chunk requires AUTH, skipped\n");
5932                 goto trigger_send;
5933         }
5934         if (length > offset) {
5935                 int retval;
5936
5937                 /*
5938                  * First check to make sure our state is correct. We would
5939                  * not get here unless we really did have a tag, so we don't
5940                  * abort if this happens, just dump the chunk silently.
5941                  */
5942                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5943                 case SCTP_STATE_COOKIE_ECHOED:
5944                         /*
5945                          * we consider data with valid tags in this state
5946                          * shows us the cookie-ack was lost. Imply it was
5947                          * there.
5948                          */
5949                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5950                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5951                                     stcb->asoc.overall_error_count,
5952                                     0,
5953                                     SCTP_FROM_SCTP_INPUT,
5954                                     __LINE__);
5955                         }
5956                         stcb->asoc.overall_error_count = 0;
5957                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5958                         break;
5959                 case SCTP_STATE_COOKIE_WAIT:
5960                         /*
5961                          * We consider OOTB any data sent during asoc setup.
5962                          */
5963                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5964                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5965                             msg);
5966                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5967                             mflowtype, mflowid, inp->fibnum,
5968                             vrf_id, port);
5969                         goto out;
5970                         /* sa_ignore NOTREACHED */
5971                         break;
5972                 case SCTP_STATE_EMPTY:  /* should not happen */
5973                 case SCTP_STATE_INUSE:  /* should not happen */
5974                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5975                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5976                 default:
5977                         goto out;
5978                         /* sa_ignore NOTREACHED */
5979                         break;
5980                 case SCTP_STATE_OPEN:
5981                 case SCTP_STATE_SHUTDOWN_SENT:
5982                         break;
5983                 }
5984                 /* plow through the data chunks while length > offset */
5985                 retval = sctp_process_data(mm, iphlen, &offset, length,
5986                     inp, stcb, net, &high_tsn);
5987                 if (retval == 2) {
5988                         /*
5989                          * The association aborted, NO UNLOCK needed since
5990                          * the association is destroyed.
5991                          */
5992                         stcb = NULL;
5993                         goto out;
5994                 }
5995                 data_processed = 1;
5996                 /*
5997                  * Anything important needs to have been m_copy'ed in
5998                  * process_data
5999                  */
6000         }
6001         /* take care of ecn */
6002         if ((data_processed == 1) &&
6003             (stcb->asoc.ecn_supported == 1) &&
6004             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
6005                 /* Yep, we need to add a ECNE */
6006                 sctp_send_ecn_echo(stcb, net, high_tsn);
6007         }
6008         if ((data_processed == 0) && (fwd_tsn_seen)) {
6009                 int was_a_gap;
6010                 uint32_t highest_tsn;
6011
6012                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
6013                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
6014                 } else {
6015                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
6016                 }
6017                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
6018                 stcb->asoc.send_sack = 1;
6019                 sctp_sack_check(stcb, was_a_gap);
6020         } else if (fwd_tsn_seen) {
6021                 stcb->asoc.send_sack = 1;
6022         }
6023         /* trigger send of any chunks in queue... */
6024 trigger_send:
6025 #ifdef SCTP_AUDITING_ENABLED
6026         sctp_audit_log(0xE0, 2);
6027         sctp_auditing(1, inp, stcb, net);
6028 #endif
6029         SCTPDBG(SCTP_DEBUG_INPUT1,
6030             "Check for chunk output prw:%d tqe:%d tf=%d\n",
6031             stcb->asoc.peers_rwnd,
6032             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
6033             stcb->asoc.total_flight);
6034         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
6035         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
6036                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
6037         }
6038         if (cnt_ctrl_ready || stcb->asoc.trigger_reset ||
6039             ((un_sent) &&
6040             (stcb->asoc.peers_rwnd > 0 ||
6041             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
6042                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
6043                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
6044                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6045         }
6046 #ifdef SCTP_AUDITING_ENABLED
6047         sctp_audit_log(0xE0, 3);
6048         sctp_auditing(2, inp, stcb, net);
6049 #endif
6050 out:
6051         if (stcb != NULL) {
6052                 SCTP_TCB_UNLOCK(stcb);
6053         }
6054         if (inp_decr != NULL) {
6055                 /* reduce ref-count */
6056                 SCTP_INP_WLOCK(inp_decr);
6057                 SCTP_INP_DECR_REF(inp_decr);
6058                 SCTP_INP_WUNLOCK(inp_decr);
6059         }
6060         return;
6061 }
6062
6063 #if 0
6064 static void
6065 sctp_print_mbuf_chain(struct mbuf *m)
6066 {
6067         for (; m; m = SCTP_BUF_NEXT(m)) {
6068                 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
6069                 if (SCTP_BUF_IS_EXTENDED(m))
6070                         SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
6071         }
6072 }
6073
6074 #endif
6075
6076 #ifdef INET
6077 void
6078 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6079 {
6080         struct mbuf *m;
6081         int iphlen;
6082         uint32_t vrf_id = 0;
6083         uint8_t ecn_bits;
6084         struct sockaddr_in src, dst;
6085         struct ip *ip;
6086         struct sctphdr *sh;
6087         struct sctp_chunkhdr *ch;
6088         int length, offset;
6089
6090 #if !defined(SCTP_WITH_NO_CSUM)
6091         uint8_t compute_crc;
6092
6093 #endif
6094         uint32_t mflowid;
6095         uint8_t mflowtype;
6096         uint16_t fibnum;
6097
6098         iphlen = off;
6099         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6100                 SCTP_RELEASE_PKT(i_pak);
6101                 return;
6102         }
6103         m = SCTP_HEADER_TO_CHAIN(i_pak);
6104 #ifdef SCTP_MBUF_LOGGING
6105         /* Log in any input mbufs */
6106         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6107                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6108         }
6109 #endif
6110 #ifdef SCTP_PACKET_LOGGING
6111         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6112                 sctp_packet_log(m);
6113         }
6114 #endif
6115         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6116             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6117             m->m_pkthdr.len,
6118             if_name(m->m_pkthdr.rcvif),
6119             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6120         mflowid = m->m_pkthdr.flowid;
6121         mflowtype = M_HASHTYPE_GET(m);
6122         fibnum = M_GETFIB(m);
6123         SCTP_STAT_INCR(sctps_recvpackets);
6124         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6125         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6126         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6127         if (SCTP_BUF_LEN(m) < offset) {
6128                 if ((m = m_pullup(m, offset)) == NULL) {
6129                         SCTP_STAT_INCR(sctps_hdrops);
6130                         return;
6131                 }
6132         }
6133         ip = mtod(m, struct ip *);
6134         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6135         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6136         offset -= sizeof(struct sctp_chunkhdr);
6137         memset(&src, 0, sizeof(struct sockaddr_in));
6138         src.sin_family = AF_INET;
6139         src.sin_len = sizeof(struct sockaddr_in);
6140         src.sin_port = sh->src_port;
6141         src.sin_addr = ip->ip_src;
6142         memset(&dst, 0, sizeof(struct sockaddr_in));
6143         dst.sin_family = AF_INET;
6144         dst.sin_len = sizeof(struct sockaddr_in);
6145         dst.sin_port = sh->dest_port;
6146         dst.sin_addr = ip->ip_dst;
6147         length = ntohs(ip->ip_len);
6148         /* Validate mbuf chain length with IP payload length. */
6149         if (SCTP_HEADER_LEN(m) != length) {
6150                 SCTPDBG(SCTP_DEBUG_INPUT1,
6151                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6152                 SCTP_STAT_INCR(sctps_hdrops);
6153                 goto out;
6154         }
6155         /* SCTP does not allow broadcasts or multicasts */
6156         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6157                 goto out;
6158         }
6159         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6160                 goto out;
6161         }
6162         ecn_bits = ip->ip_tos;
6163 #if defined(SCTP_WITH_NO_CSUM)
6164         SCTP_STAT_INCR(sctps_recvnocrc);
6165 #else
6166         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6167                 SCTP_STAT_INCR(sctps_recvhwcrc);
6168                 compute_crc = 0;
6169         } else {
6170                 SCTP_STAT_INCR(sctps_recvswcrc);
6171                 compute_crc = 1;
6172         }
6173 #endif
6174         sctp_common_input_processing(&m, iphlen, offset, length,
6175             (struct sockaddr *)&src,
6176             (struct sockaddr *)&dst,
6177             sh, ch,
6178 #if !defined(SCTP_WITH_NO_CSUM)
6179             compute_crc,
6180 #endif
6181             ecn_bits,
6182             mflowtype, mflowid, fibnum,
6183             vrf_id, port);
6184 out:
6185         if (m) {
6186                 sctp_m_freem(m);
6187         }
6188         return;
6189 }
6190
6191 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6192 extern int *sctp_cpuarry;
6193
6194 #endif
6195
6196 void
6197 sctp_input(struct mbuf *m, int off)
6198 {
6199 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6200         struct ip *ip;
6201         struct sctphdr *sh;
6202         int offset;
6203         int cpu_to_use;
6204         uint32_t flowid, tag;
6205
6206         if (mp_ncpus > 1) {
6207                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6208                         flowid = m->m_pkthdr.flowid;
6209                 } else {
6210                         /*
6211                          * No flow id built by lower layers fix it so we
6212                          * create one.
6213                          */
6214                         offset = off + sizeof(struct sctphdr);
6215                         if (SCTP_BUF_LEN(m) < offset) {
6216                                 if ((m = m_pullup(m, offset)) == NULL) {
6217                                         SCTP_STAT_INCR(sctps_hdrops);
6218                                         return;
6219                                 }
6220                         }
6221                         ip = mtod(m, struct ip *);
6222                         sh = (struct sctphdr *)((caddr_t)ip + off);
6223                         tag = htonl(sh->v_tag);
6224                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6225                         m->m_pkthdr.flowid = flowid;
6226                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6227                 }
6228                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6229                 sctp_queue_to_mcore(m, off, cpu_to_use);
6230                 return;
6231         }
6232 #endif
6233         sctp_input_with_port(m, off, 0);
6234 }
6235
6236 #endif