sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_input.h>
  44 #include <netinet/sctp_auth.h>
  45 #include <netinet/sctp_indata.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctp_bsd_addr.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_crc32.h>
  50 #if defined(INET) || defined(INET6)
  51 #include <netinet/udp.h>
  52 #endif
  53 #include <sys/smp.h>
  54
  55
  56
  57 static void
  58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  59 {
  60         struct sctp_nets *net;
  61
  62         /*
  63          * This now not only stops all cookie timers it also stops any INIT
  64          * timers as well. This will make sure that the timers are stopped
  65          * in all collision cases.
  66          */
  67         SCTP_TCB_LOCK_ASSERT(stcb);
  68         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  69                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  70                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  71                             stcb->sctp_ep,
  72                             stcb,
  73                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  74                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  75                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  76                             stcb->sctp_ep,
  77                             stcb,
  78                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  79                 }
  80         }
  81 }
  82
  83 /* INIT handler */
  84 static void
  85 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  86     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  87     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  88     struct sctp_tcb *stcb, int *abort_no_unlock,
  89     uint8_t mflowtype, uint32_t mflowid,
  90     uint32_t vrf_id, uint16_t port)
  91 {
  92         struct sctp_init *init;
  93         struct mbuf *op_err;
  94
  95         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  96             (void *)stcb);
  97         if (stcb == NULL) {
  98                 SCTP_INP_RLOCK(inp);
  99         }
 100         /* validate length */
 101         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 102                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 103                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 104                     mflowtype, mflowid,
 105                     vrf_id, port);
 106                 if (stcb)
 107                         *abort_no_unlock = 1;
 108                 goto outnow;
 109         }
 110         /* validate parameters */
 111         init = &cp->init;
 112         if (init->initiate_tag == 0) {
 113                 /* protocol error... send abort */
 114                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 115                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 116                     mflowtype, mflowid,
 117                     vrf_id, port);
 118                 if (stcb)
 119                         *abort_no_unlock = 1;
 120                 goto outnow;
 121         }
 122         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 123                 /* invalid parameter... send abort */
 124                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 125                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 126                     mflowtype, mflowid,
 127                     vrf_id, port);
 128                 if (stcb)
 129                         *abort_no_unlock = 1;
 130                 goto outnow;
 131         }
 132         if (init->num_inbound_streams == 0) {
 133                 /* protocol error... send abort */
 134                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 135                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 136                     mflowtype, mflowid,
 137                     vrf_id, port);
 138                 if (stcb)
 139                         *abort_no_unlock = 1;
 140                 goto outnow;
 141         }
 142         if (init->num_outbound_streams == 0) {
 143                 /* protocol error... send abort */
 144                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 145                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 146                     mflowtype, mflowid,
 147                     vrf_id, port);
 148                 if (stcb)
 149                         *abort_no_unlock = 1;
 150                 goto outnow;
 151         }
 152         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 153             offset + ntohs(cp->ch.chunk_length))) {
 154                 /* auth parameter(s) error... send abort */
 155                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 156                     "Problem with AUTH parameters");
 157                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 158                     mflowtype, mflowid,
 159                     vrf_id, port);
 160                 if (stcb)
 161                         *abort_no_unlock = 1;
 162                 goto outnow;
 163         }
 164         /*
 165          * We are only accepting if we have a socket with positive
 166          * so_qlimit.
 167          */
 168         if ((stcb == NULL) &&
 169             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 170             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 171             (inp->sctp_socket == NULL) ||
 172             (inp->sctp_socket->so_qlimit == 0))) {
 173                 /*
 174                  * FIX ME ?? What about TCP model and we have a
 175                  * match/restart case? Actually no fix is needed. the lookup
 176                  * will always find the existing assoc so stcb would not be
 177                  * NULL. It may be questionable to do this since we COULD
 178                  * just send back the INIT-ACK and hope that the app did
 179                  * accept()'s by the time the COOKIE was sent. But there is
 180                  * a price to pay for COOKIE generation and I don't want to
 181                  * pay it on the chance that the app will actually do some
 182                  * accepts(). The App just looses and should NOT be in this
 183                  * state :-)
 184                  */
 185                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 186                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 187                             "No listener");
 188                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 189                             mflowtype, mflowid, inp->fibnum,
 190                             vrf_id, port);
 191                 }
 192                 goto outnow;
 193         }
 194         if ((stcb != NULL) &&
 195             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 196                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 197                 sctp_send_shutdown_ack(stcb, NULL);
 198                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 199         } else {
 200                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 201                 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst,
 202                     sh, cp,
 203                     mflowtype, mflowid,
 204                     vrf_id, port,
 205                     ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 206         }
 207 outnow:
 208         if (stcb == NULL) {
 209                 SCTP_INP_RUNLOCK(inp);
 210         }
 211 }
 212
 213 /*
 214  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 215  */
 216
 217 int
 218 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 219 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 220     SCTP_UNUSED
 221 #endif
 222 )
 223 {
 224         int unsent_data = 0;
 225         unsigned int i;
 226         struct sctp_stream_queue_pending *sp;
 227         struct sctp_association *asoc;
 228
 229         /*
 230          * This function returns the number of streams that have true unsent
 231          * data on them. Note that as it looks through it will clean up any
 232          * places that have old data that has been sent but left at top of
 233          * stream queue.
 234          */
 235         asoc = &stcb->asoc;
 236         SCTP_TCB_SEND_LOCK(stcb);
 237         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 238                 /* Check to see if some data queued */
 239                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 240                         /* sa_ignore FREED_MEMORY */
 241                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 242                         if (sp == NULL) {
 243                                 continue;
 244                         }
 245                         if ((sp->msg_is_complete) &&
 246                             (sp->length == 0) &&
 247                             (sp->sender_all_done)) {
 248                                 /*
 249                                  * We are doing differed cleanup. Last time
 250                                  * through when we took all the data the
 251                                  * sender_all_done was not set.
 252                                  */
 253                                 if (sp->put_last_out == 0) {
 254                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 255                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 256                                             sp->sender_all_done,
 257                                             sp->length,
 258                                             sp->msg_is_complete,
 259                                             sp->put_last_out);
 260                                 }
 261                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 262                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 263                                 if (sp->net) {
 264                                         sctp_free_remote_addr(sp->net);
 265                                         sp->net = NULL;
 266                                 }
 267                                 if (sp->data) {
 268                                         sctp_m_freem(sp->data);
 269                                         sp->data = NULL;
 270                                 }
 271                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 272                         } else {
 273                                 unsent_data++;
 274                                 break;
 275                         }
 276                 }
 277         }
 278         SCTP_TCB_SEND_UNLOCK(stcb);
 279         return (unsent_data);
 280 }
 281
 282 static int
 283 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 284 {
 285         struct sctp_init *init;
 286         struct sctp_association *asoc;
 287         struct sctp_nets *lnet;
 288         unsigned int i;
 289
 290         init = &cp->init;
 291         asoc = &stcb->asoc;
 292         /* save off parameters */
 293         asoc->peer_vtag = ntohl(init->initiate_tag);
 294         asoc->peers_rwnd = ntohl(init->a_rwnd);
 295         /* init tsn's */
 296         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 297
 298         if (!TAILQ_EMPTY(&asoc->nets)) {
 299                 /* update any ssthresh's that may have a default */
 300                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 301                         lnet->ssthresh = asoc->peers_rwnd;
 302                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 303                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 304                         }
 305                 }
 306         }
 307         SCTP_TCB_SEND_LOCK(stcb);
 308         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 309                 unsigned int newcnt;
 310                 struct sctp_stream_out *outs;
 311                 struct sctp_stream_queue_pending *sp, *nsp;
 312                 struct sctp_tmit_chunk *chk, *nchk;
 313
 314                 /* abandon the upper streams */
 315                 newcnt = ntohs(init->num_inbound_streams);
 316                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 317                         if (chk->rec.data.stream_number >= newcnt) {
 318                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 319                                 asoc->send_queue_cnt--;
 320                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
 321                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
 322 #ifdef INVARIANTS
 323                                 } else {
 324                                         panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
 325 #endif
 326                                 }
 327                                 if (chk->data != NULL) {
 328                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 329                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 330                                             0, chk, SCTP_SO_NOT_LOCKED);
 331                                         if (chk->data) {
 332                                                 sctp_m_freem(chk->data);
 333                                                 chk->data = NULL;
 334                                         }
 335                                 }
 336                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 337                                 /* sa_ignore FREED_MEMORY */
 338                         }
 339                 }
 340                 if (asoc->strmout) {
 341                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 342                                 outs = &asoc->strmout[i];
 343                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 344                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 345                                         asoc->stream_queue_cnt--;
 346                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 347                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 348                                         if (sp->data) {
 349                                                 sctp_m_freem(sp->data);
 350                                                 sp->data = NULL;
 351                                         }
 352                                         if (sp->net) {
 353                                                 sctp_free_remote_addr(sp->net);
 354                                                 sp->net = NULL;
 355                                         }
 356                                         /* Free the chunk */
 357                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 358                                         /* sa_ignore FREED_MEMORY */
 359                                 }
 360                         }
 361                 }
 362                 /* cut back the count */
 363                 asoc->pre_open_streams = newcnt;
 364         }
 365         SCTP_TCB_SEND_UNLOCK(stcb);
 366         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 367
 368         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 369         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 370         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 371                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 372         }
 373         /* This is the next one we expect */
 374         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 375
 376         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 377         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 378
 379         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 380         /* open the requested streams */
 381
 382         if (asoc->strmin != NULL) {
 383                 /* Free the old ones */
 384                 struct sctp_queued_to_read *ctl, *nctl;
 385
 386                 for (i = 0; i < asoc->streamincnt; i++) {
 387                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 388                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 389                                 sctp_free_remote_addr(ctl->whoFrom);
 390                                 ctl->whoFrom = NULL;
 391                                 sctp_m_freem(ctl->data);
 392                                 ctl->data = NULL;
 393                                 sctp_free_a_readq(stcb, ctl);
 394                         }
 395                 }
 396                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 397         }
 398         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 399                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 400         } else {
 401                 asoc->streamincnt = asoc->max_inbound_streams;
 402         }
 403         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 404             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 405         if (asoc->strmin == NULL) {
 406                 /* we didn't get memory for the streams! */
 407                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 408                 return (-1);
 409         }
 410         for (i = 0; i < asoc->streamincnt; i++) {
 411                 asoc->strmin[i].stream_no = i;
 412                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 413                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 414                 asoc->strmin[i].delivery_started = 0;
 415         }
 416         /*
 417          * load_address_from_init will put the addresses into the
 418          * association when the COOKIE is processed or the INIT-ACK is
 419          * processed. Both types of COOKIE's existing and new call this
 420          * routine. It will remove addresses that are no longer in the
 421          * association (for the restarting case where addresses are
 422          * removed). Up front when the INIT arrives we will discard it if it
 423          * is a restart and new addresses have been added.
 424          */
 425         /* sa_ignore MEMLEAK */
 426         return (0);
 427 }
 428
 429 /*
 430  * INIT-ACK message processing/consumption returns value < 0 on error
 431  */
 432 static int
 433 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 434     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 435     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 436     struct sctp_nets *net, int *abort_no_unlock,
 437     uint8_t mflowtype, uint32_t mflowid,
 438     uint32_t vrf_id)
 439 {
 440         struct sctp_association *asoc;
 441         struct mbuf *op_err;
 442         int retval, abort_flag;
 443         uint32_t initack_limit;
 444         int nat_friendly = 0;
 445
 446         /* First verify that we have no illegal param's */
 447         abort_flag = 0;
 448
 449         op_err = sctp_arethere_unrecognized_parameters(m,
 450             (offset + sizeof(struct sctp_init_chunk)),
 451             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 452         if (abort_flag) {
 453                 /* Send an abort and notify peer */
 454                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 455                 *abort_no_unlock = 1;
 456                 return (-1);
 457         }
 458         asoc = &stcb->asoc;
 459         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 460         /* process the peer's parameters in the INIT-ACK */
 461         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 462         if (retval < 0) {
 463                 return (retval);
 464         }
 465         initack_limit = offset + ntohs(cp->ch.chunk_length);
 466         /* load all addresses */
 467         if ((retval = sctp_load_addresses_from_init(stcb, m,
 468             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 469             src, dst, NULL))) {
 470                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 471                     "Problem with address parameters");
 472                 SCTPDBG(SCTP_DEBUG_INPUT1,
 473                     "Load addresses from INIT causes an abort %d\n",
 474                     retval);
 475                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 476                     src, dst, sh, op_err,
 477                     mflowtype, mflowid,
 478                     vrf_id, net->port);
 479                 *abort_no_unlock = 1;
 480                 return (-1);
 481         }
 482         /* if the peer doesn't support asconf, flush the asconf queue */
 483         if (asoc->asconf_supported == 0) {
 484                 struct sctp_asconf_addr *param, *nparam;
 485
 486                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 487                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 488                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 489                 }
 490         }
 491         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 492             stcb->asoc.local_hmacs);
 493         if (op_err) {
 494                 sctp_queue_op_err(stcb, op_err);
 495                 /* queuing will steal away the mbuf chain to the out queue */
 496                 op_err = NULL;
 497         }
 498         /* extract the cookie and queue it to "echo" it back... */
 499         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 500                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 501                     stcb->asoc.overall_error_count,
 502                     0,
 503                     SCTP_FROM_SCTP_INPUT,
 504                     __LINE__);
 505         }
 506         stcb->asoc.overall_error_count = 0;
 507         net->error_count = 0;
 508
 509         /*
 510          * Cancel the INIT timer, We do this first before queueing the
 511          * cookie. We always cancel at the primary to assue that we are
 512          * canceling the timer started by the INIT which always goes to the
 513          * primary.
 514          */
 515         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 516             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 517
 518         /* calculate the RTO */
 519         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 520             SCTP_RTT_FROM_NON_DATA);
 521
 522         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 523         if (retval < 0) {
 524                 /*
 525                  * No cookie, we probably should send a op error. But in any
 526                  * case if there is no cookie in the INIT-ACK, we can
 527                  * abandon the peer, its broke.
 528                  */
 529                 if (retval == -3) {
 530                         /* We abort with an error of missing mandatory param */
 531                         op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, "");
 532                         if (op_err) {
 533                                 /*
 534                                  * Expand beyond to include the mandatory
 535                                  * param cookie
 536                                  */
 537                                 struct sctp_inv_mandatory_param *mp;
 538
 539                                 SCTP_BUF_LEN(op_err) =
 540                                     sizeof(struct sctp_inv_mandatory_param);
 541                                 mp = mtod(op_err,
 542                                     struct sctp_inv_mandatory_param *);
 543                                 /* Subtract the reserved param */
 544                                 mp->length =
 545                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 546                                 mp->num_param = htonl(1);
 547                                 mp->param = htons(SCTP_STATE_COOKIE);
 548                                 mp->resv = 0;
 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_missing_nat_state *natc;
 782
 783                 natc = (struct sctp_missing_nat_state *)(abort + 1);
 784                 error = ntohs(natc->cause);
 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
 868 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 869         struct socket *so;
 870
 871 #endif
 872
 873         SCTPDBG(SCTP_DEBUG_INPUT2,
 874             "sctp_handle_shutdown: handling SHUTDOWN\n");
 875         if (stcb == NULL)
 876                 return;
 877         asoc = &stcb->asoc;
 878         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 879             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 880                 return;
 881         }
 882         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 883                 /* Shutdown NOT the expected size */
 884                 return;
 885         } else {
 886                 sctp_update_acked(stcb, cp, abort_flag);
 887                 if (*abort_flag) {
 888                         return;
 889                 }
 890         }
 891         if (asoc->control_pdapi) {
 892                 /*
 893                  * With a normal shutdown we assume the end of last record.
 894                  */
 895                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 896                 asoc->control_pdapi->end_added = 1;
 897                 asoc->control_pdapi->pdapi_aborted = 1;
 898                 asoc->control_pdapi = NULL;
 899                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 900 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 901                 so = SCTP_INP_SO(stcb->sctp_ep);
 902                 atomic_add_int(&stcb->asoc.refcnt, 1);
 903                 SCTP_TCB_UNLOCK(stcb);
 904                 SCTP_SOCKET_LOCK(so, 1);
 905                 SCTP_TCB_LOCK(stcb);
 906                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 907                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 908                         /* assoc was freed while we were unlocked */
 909                         SCTP_SOCKET_UNLOCK(so, 1);
 910                         return;
 911                 }
 912 #endif
 913                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 914 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 915                 SCTP_SOCKET_UNLOCK(so, 1);
 916 #endif
 917         }
 918         /* goto SHUTDOWN_RECEIVED state to block new requests */
 919         if (stcb->sctp_socket) {
 920                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 921                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 922                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 923                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 924                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 925                         /*
 926                          * notify upper layer that peer has initiated a
 927                          * shutdown
 928                          */
 929                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 930
 931                         /* reset time */
 932                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 933                 }
 934         }
 935         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 936                 /*
 937                  * stop the shutdown timer, since we WILL move to
 938                  * SHUTDOWN-ACK-SENT.
 939                  */
 940                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 941                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 942         }
 943         /* Now is there unsent data on a stream somewhere? */
 944         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 945
 946         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 947             !TAILQ_EMPTY(&asoc->sent_queue) ||
 948             some_on_streamwheel) {
 949                 /* By returning we will push more data out */
 950                 return;
 951         } else {
 952                 /* no outstanding data to send, so move on... */
 953                 /* send SHUTDOWN-ACK */
 954                 /* move to SHUTDOWN-ACK-SENT state */
 955                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 956                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 957                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 958                 }
 959                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 960                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 961                 sctp_stop_timers_for_shutdown(stcb);
 962                 sctp_send_shutdown_ack(stcb, net);
 963                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 964                     stcb, net);
 965         }
 966 }
 967
 968 static void
 969 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 970     struct sctp_tcb *stcb,
 971     struct sctp_nets *net)
 972 {
 973         struct sctp_association *asoc;
 974
 975 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 976         struct socket *so;
 977
 978         so = SCTP_INP_SO(stcb->sctp_ep);
 979 #endif
 980         SCTPDBG(SCTP_DEBUG_INPUT2,
 981             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 982         if (stcb == NULL)
 983                 return;
 984
 985         asoc = &stcb->asoc;
 986         /* process according to association state */
 987         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 988             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 989                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 990                 sctp_send_shutdown_complete(stcb, net, 1);
 991                 SCTP_TCB_UNLOCK(stcb);
 992                 return;
 993         }
 994         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 995             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 996                 /* unexpected SHUTDOWN-ACK... so ignore... */
 997                 SCTP_TCB_UNLOCK(stcb);
 998                 return;
 999         }
1000         if (asoc->control_pdapi) {
1001                 /*
1002                  * With a normal shutdown we assume the end of last record.
1003                  */
1004                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1005                 asoc->control_pdapi->end_added = 1;
1006                 asoc->control_pdapi->pdapi_aborted = 1;
1007                 asoc->control_pdapi = NULL;
1008                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1009 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1010                 atomic_add_int(&stcb->asoc.refcnt, 1);
1011                 SCTP_TCB_UNLOCK(stcb);
1012                 SCTP_SOCKET_LOCK(so, 1);
1013                 SCTP_TCB_LOCK(stcb);
1014                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1015                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1016                         /* assoc was freed while we were unlocked */
1017                         SCTP_SOCKET_UNLOCK(so, 1);
1018                         return;
1019                 }
1020 #endif
1021                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1022 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1023                 SCTP_SOCKET_UNLOCK(so, 1);
1024 #endif
1025         }
1026 #ifdef INVARIANTS
1027         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1028             !TAILQ_EMPTY(&asoc->sent_queue) ||
1029             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1030                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1031         }
1032 #endif
1033         /* stop the timer */
1034         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1035             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1036         /* send SHUTDOWN-COMPLETE */
1037         sctp_send_shutdown_complete(stcb, net, 0);
1038         /* notify upper layer protocol */
1039         if (stcb->sctp_socket) {
1040                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1041                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1042                         stcb->sctp_socket->so_snd.sb_cc = 0;
1043                 }
1044                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1045         }
1046         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1047         /* free the TCB but first save off the ep */
1048 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1049         atomic_add_int(&stcb->asoc.refcnt, 1);
1050         SCTP_TCB_UNLOCK(stcb);
1051         SCTP_SOCKET_LOCK(so, 1);
1052         SCTP_TCB_LOCK(stcb);
1053         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1054 #endif
1055         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1056             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1057 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1058         SCTP_SOCKET_UNLOCK(so, 1);
1059 #endif
1060 }
1061
1062 /*
1063  * Skip past the param header and then we will find the chunk that caused the
1064  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1065  * our peer must be broken.
1066  */
1067 static void
1068 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1069     struct sctp_nets *net)
1070 {
1071         struct sctp_chunkhdr *chk;
1072
1073         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1074         switch (chk->chunk_type) {
1075         case SCTP_ASCONF_ACK:
1076         case SCTP_ASCONF:
1077                 sctp_asconf_cleanup(stcb, net);
1078                 break;
1079         case SCTP_FORWARD_CUM_TSN:
1080                 stcb->asoc.prsctp_supported = 0;
1081                 break;
1082         default:
1083                 SCTPDBG(SCTP_DEBUG_INPUT2,
1084                     "Peer does not support chunk type %d(%x)??\n",
1085                     chk->chunk_type, (uint32_t) chk->chunk_type);
1086                 break;
1087         }
1088 }
1089
1090 /*
1091  * Skip past the param header and then we will find the param that caused the
1092  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1093  * these will turn of specific features.
1094  * XXX: Is this the right thing to do?
1095  */
1096 static void
1097 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1098 {
1099         struct sctp_paramhdr *pbad;
1100
1101         pbad = phdr + 1;
1102         switch (ntohs(pbad->param_type)) {
1103                 /* pr-sctp draft */
1104         case SCTP_PRSCTP_SUPPORTED:
1105                 stcb->asoc.prsctp_supported = 0;
1106                 break;
1107         case SCTP_SUPPORTED_CHUNK_EXT:
1108                 break;
1109                 /* draft-ietf-tsvwg-addip-sctp */
1110         case SCTP_HAS_NAT_SUPPORT:
1111                 stcb->asoc.peer_supports_nat = 0;
1112                 break;
1113         case SCTP_ADD_IP_ADDRESS:
1114         case SCTP_DEL_IP_ADDRESS:
1115         case SCTP_SET_PRIM_ADDR:
1116                 stcb->asoc.asconf_supported = 0;
1117                 break;
1118         case SCTP_SUCCESS_REPORT:
1119         case SCTP_ERROR_CAUSE_IND:
1120                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1121                 SCTPDBG(SCTP_DEBUG_INPUT2,
1122                     "Turning off ASCONF to this strange peer\n");
1123                 stcb->asoc.asconf_supported = 0;
1124                 break;
1125         default:
1126                 SCTPDBG(SCTP_DEBUG_INPUT2,
1127                     "Peer does not support param type %d(%x)??\n",
1128                     pbad->param_type, (uint32_t) pbad->param_type);
1129                 break;
1130         }
1131 }
1132
1133 static int
1134 sctp_handle_error(struct sctp_chunkhdr *ch,
1135     struct sctp_tcb *stcb, struct sctp_nets *net)
1136 {
1137         int chklen;
1138         struct sctp_paramhdr *phdr;
1139         uint16_t error, error_type;
1140         uint16_t error_len;
1141         struct sctp_association *asoc;
1142         int adjust;
1143
1144 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1145         struct socket *so;
1146
1147 #endif
1148
1149         /* parse through all of the errors and process */
1150         asoc = &stcb->asoc;
1151         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1152             sizeof(struct sctp_chunkhdr));
1153         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1154         error = 0;
1155         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1156                 /* Process an Error Cause */
1157                 error_type = ntohs(phdr->param_type);
1158                 error_len = ntohs(phdr->param_length);
1159                 if ((error_len > chklen) || (error_len == 0)) {
1160                         /* invalid param length for this param */
1161                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1162                             chklen, error_len);
1163                         return (0);
1164                 }
1165                 if (error == 0) {
1166                         /* report the first error cause */
1167                         error = error_type;
1168                 }
1169                 switch (error_type) {
1170                 case SCTP_CAUSE_INVALID_STREAM:
1171                 case SCTP_CAUSE_MISSING_PARAM:
1172                 case SCTP_CAUSE_INVALID_PARAM:
1173                 case SCTP_CAUSE_NO_USER_DATA:
1174                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1175                             error_type);
1176                         break;
1177                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1178                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1179                             ch->chunk_flags);
1180                         if (sctp_handle_nat_colliding_state(stcb)) {
1181                                 return (0);
1182                         }
1183                         break;
1184                 case SCTP_CAUSE_NAT_MISSING_STATE:
1185                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1186                             ch->chunk_flags);
1187                         if (sctp_handle_nat_missing_state(stcb, net)) {
1188                                 return (0);
1189                         }
1190                         break;
1191                 case SCTP_CAUSE_STALE_COOKIE:
1192                         /*
1193                          * We only act if we have echoed a cookie and are
1194                          * waiting.
1195                          */
1196                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1197                                 int *p;
1198
1199                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1200                                 /* Save the time doubled */
1201                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1202                                 asoc->stale_cookie_count++;
1203                                 if (asoc->stale_cookie_count >
1204                                     asoc->max_init_times) {
1205                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1206                                         /* now free the asoc */
1207 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1208                                         so = SCTP_INP_SO(stcb->sctp_ep);
1209                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1210                                         SCTP_TCB_UNLOCK(stcb);
1211                                         SCTP_SOCKET_LOCK(so, 1);
1212                                         SCTP_TCB_LOCK(stcb);
1213                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1214 #endif
1215                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1216                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1217 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1218                                         SCTP_SOCKET_UNLOCK(so, 1);
1219 #endif
1220                                         return (-1);
1221                                 }
1222                                 /* blast back to INIT state */
1223                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1224                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1225                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1226                                 sctp_stop_all_cookie_timers(stcb);
1227                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1228                         }
1229                         break;
1230                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1231                         /*
1232                          * Nothing we can do here, we don't do hostname
1233                          * addresses so if the peer does not like my IPv6
1234                          * (or IPv4 for that matter) it does not matter. If
1235                          * they don't support that type of address, they can
1236                          * NOT possibly get that packet type... i.e. with no
1237                          * IPv6 you can't recieve a IPv6 packet. so we can
1238                          * safely ignore this one. If we ever added support
1239                          * for HOSTNAME Addresses, then we would need to do
1240                          * something here.
1241                          */
1242                         break;
1243                 case SCTP_CAUSE_UNRECOG_CHUNK:
1244                         sctp_process_unrecog_chunk(stcb, phdr, net);
1245                         break;
1246                 case SCTP_CAUSE_UNRECOG_PARAM:
1247                         sctp_process_unrecog_param(stcb, phdr);
1248                         break;
1249                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1250                         /*
1251                          * We ignore this since the timer will drive out a
1252                          * new cookie anyway and there timer will drive us
1253                          * to send a SHUTDOWN_COMPLETE. We can't send one
1254                          * here since we don't have their tag.
1255                          */
1256                         break;
1257                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1258                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1259                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1260                         /*
1261                          * We should NOT get these here, but in a
1262                          * ASCONF-ACK.
1263                          */
1264                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1265                             error_type);
1266                         break;
1267                 case SCTP_CAUSE_OUT_OF_RESC:
1268                         /*
1269                          * And what, pray tell do we do with the fact that
1270                          * the peer is out of resources? Not really sure we
1271                          * could do anything but abort. I suspect this
1272                          * should have came WITH an abort instead of in a
1273                          * OP-ERROR.
1274                          */
1275                         break;
1276                 default:
1277                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1278                             error_type);
1279                         break;
1280                 }
1281                 adjust = SCTP_SIZE32(error_len);
1282                 chklen -= adjust;
1283                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1284         }
1285         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1286         return (0);
1287 }
1288
1289 static int
1290 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1291     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1292     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1293     struct sctp_nets *net, int *abort_no_unlock,
1294     uint8_t mflowtype, uint32_t mflowid,
1295     uint32_t vrf_id)
1296 {
1297         struct sctp_init_ack *init_ack;
1298         struct mbuf *op_err;
1299
1300         SCTPDBG(SCTP_DEBUG_INPUT2,
1301             "sctp_handle_init_ack: handling INIT-ACK\n");
1302
1303         if (stcb == NULL) {
1304                 SCTPDBG(SCTP_DEBUG_INPUT2,
1305                     "sctp_handle_init_ack: TCB is null\n");
1306                 return (-1);
1307         }
1308         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1309                 /* Invalid length */
1310                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1311                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1312                     src, dst, sh, op_err,
1313                     mflowtype, mflowid,
1314                     vrf_id, net->port);
1315                 *abort_no_unlock = 1;
1316                 return (-1);
1317         }
1318         init_ack = &cp->init;
1319         /* validate parameters */
1320         if (init_ack->initiate_tag == 0) {
1321                 /* protocol error... send an abort */
1322                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1323                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1324                     src, dst, sh, op_err,
1325                     mflowtype, mflowid,
1326                     vrf_id, net->port);
1327                 *abort_no_unlock = 1;
1328                 return (-1);
1329         }
1330         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1331                 /* protocol error... send an abort */
1332                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1333                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1334                     src, dst, sh, op_err,
1335                     mflowtype, mflowid,
1336                     vrf_id, net->port);
1337                 *abort_no_unlock = 1;
1338                 return (-1);
1339         }
1340         if (init_ack->num_inbound_streams == 0) {
1341                 /* protocol error... send an abort */
1342                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1343                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1344                     src, dst, sh, op_err,
1345                     mflowtype, mflowid,
1346                     vrf_id, net->port);
1347                 *abort_no_unlock = 1;
1348                 return (-1);
1349         }
1350         if (init_ack->num_outbound_streams == 0) {
1351                 /* protocol error... send an abort */
1352                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1353                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1354                     src, dst, sh, op_err,
1355                     mflowtype, mflowid,
1356                     vrf_id, net->port);
1357                 *abort_no_unlock = 1;
1358                 return (-1);
1359         }
1360         /* process according to association state... */
1361         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1362         case SCTP_STATE_COOKIE_WAIT:
1363                 /* this is the expected state for this chunk */
1364                 /* process the INIT-ACK parameters */
1365                 if (stcb->asoc.primary_destination->dest_state &
1366                     SCTP_ADDR_UNCONFIRMED) {
1367                         /*
1368                          * The primary is where we sent the INIT, we can
1369                          * always consider it confirmed when the INIT-ACK is
1370                          * returned. Do this before we load addresses
1371                          * though.
1372                          */
1373                         stcb->asoc.primary_destination->dest_state &=
1374                             ~SCTP_ADDR_UNCONFIRMED;
1375                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1376                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1377                 }
1378                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1379                     net, abort_no_unlock,
1380                     mflowtype, mflowid,
1381                     vrf_id) < 0) {
1382                         /* error in parsing parameters */
1383                         return (-1);
1384                 }
1385                 /* update our state */
1386                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1387                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1388
1389                 /* reset the RTO calc */
1390                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1391                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1392                             stcb->asoc.overall_error_count,
1393                             0,
1394                             SCTP_FROM_SCTP_INPUT,
1395                             __LINE__);
1396                 }
1397                 stcb->asoc.overall_error_count = 0;
1398                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1399                 /*
1400                  * collapse the init timer back in case of a exponential
1401                  * backoff
1402                  */
1403                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1404                     stcb, net);
1405                 /*
1406                  * the send at the end of the inbound data processing will
1407                  * cause the cookie to be sent
1408                  */
1409                 break;
1410         case SCTP_STATE_SHUTDOWN_SENT:
1411                 /* incorrect state... discard */
1412                 break;
1413         case SCTP_STATE_COOKIE_ECHOED:
1414                 /* incorrect state... discard */
1415                 break;
1416         case SCTP_STATE_OPEN:
1417                 /* incorrect state... discard */
1418                 break;
1419         case SCTP_STATE_EMPTY:
1420         case SCTP_STATE_INUSE:
1421         default:
1422                 /* incorrect state... discard */
1423                 return (-1);
1424                 break;
1425         }
1426         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1427         return (0);
1428 }
1429
1430 static struct sctp_tcb *
1431 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1432     struct sockaddr *src, struct sockaddr *dst,
1433     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1434     struct sctp_inpcb *inp, struct sctp_nets **netp,
1435     struct sockaddr *init_src, int *notification,
1436     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1437     uint8_t mflowtype, uint32_t mflowid,
1438     uint32_t vrf_id, uint16_t port);
1439
1440
1441 /*
1442  * handle a state cookie for an existing association m: input packet mbuf
1443  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1444  * "split" mbuf and the cookie signature does not exist offset: offset into
1445  * mbuf to the cookie-echo chunk
1446  */
1447 static struct sctp_tcb *
1448 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1449     struct sockaddr *src, struct sockaddr *dst,
1450     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1451     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1452     struct sockaddr *init_src, int *notification,
1453     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1454     uint8_t mflowtype, uint32_t mflowid,
1455     uint32_t vrf_id, uint16_t port)
1456 {
1457         struct sctp_association *asoc;
1458         struct sctp_init_chunk *init_cp, init_buf;
1459         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1460         struct sctp_nets *net;
1461         struct mbuf *op_err;
1462         int init_offset, initack_offset, i;
1463         int retval;
1464         int spec_flag = 0;
1465         uint32_t how_indx;
1466
1467 #if defined(SCTP_DETAILED_STR_STATS)
1468         int j;
1469
1470 #endif
1471
1472         net = *netp;
1473         /* I know that the TCB is non-NULL from the caller */
1474         asoc = &stcb->asoc;
1475         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1476                 if (asoc->cookie_how[how_indx] == 0)
1477                         break;
1478         }
1479         if (how_indx < sizeof(asoc->cookie_how)) {
1480                 asoc->cookie_how[how_indx] = 1;
1481         }
1482         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1483                 /* SHUTDOWN came in after sending INIT-ACK */
1484                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1485                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1486                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1487                     mflowtype, mflowid, inp->fibnum,
1488                     vrf_id, net->port);
1489                 if (how_indx < sizeof(asoc->cookie_how))
1490                         asoc->cookie_how[how_indx] = 2;
1491                 return (NULL);
1492         }
1493         /*
1494          * find and validate the INIT chunk in the cookie (peer's info) the
1495          * INIT should start after the cookie-echo header struct (chunk
1496          * header, state cookie header struct)
1497          */
1498         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1499
1500         init_cp = (struct sctp_init_chunk *)
1501             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1502             (uint8_t *) & init_buf);
1503         if (init_cp == NULL) {
1504                 /* could not pull a INIT chunk in cookie */
1505                 return (NULL);
1506         }
1507         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1508                 return (NULL);
1509         }
1510         /*
1511          * find and validate the INIT-ACK chunk in the cookie (my info) the
1512          * INIT-ACK follows the INIT chunk
1513          */
1514         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1515         initack_cp = (struct sctp_init_ack_chunk *)
1516             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1517             (uint8_t *) & initack_buf);
1518         if (initack_cp == NULL) {
1519                 /* could not pull INIT-ACK chunk in cookie */
1520                 return (NULL);
1521         }
1522         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1523                 return (NULL);
1524         }
1525         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1526             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1527                 /*
1528                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1529                  * to get into the OPEN state
1530                  */
1531                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1532                         /*-
1533                          * Opps, this means that we somehow generated two vtag's
1534                          * the same. I.e. we did:
1535                          *  Us               Peer
1536                          *   <---INIT(tag=a)------
1537                          *   ----INIT-ACK(tag=t)-->
1538                          *   ----INIT(tag=t)------> *1
1539                          *   <---INIT-ACK(tag=a)---
1540                          *   <----CE(tag=t)------------- *2
1541                          *
1542                          * At point *1 we should be generating a different
1543                          * tag t'. Which means we would throw away the CE and send
1544                          * ours instead. Basically this is case C (throw away side).
1545                          */
1546                         if (how_indx < sizeof(asoc->cookie_how))
1547                                 asoc->cookie_how[how_indx] = 17;
1548                         return (NULL);
1549
1550                 }
1551                 switch (SCTP_GET_STATE(asoc)) {
1552                 case SCTP_STATE_COOKIE_WAIT:
1553                 case SCTP_STATE_COOKIE_ECHOED:
1554                         /*
1555                          * INIT was sent but got a COOKIE_ECHO with the
1556                          * correct tags... just accept it...but we must
1557                          * process the init so that we can make sure we have
1558                          * the right seq no's.
1559                          */
1560                         /* First we must process the INIT !! */
1561                         retval = sctp_process_init(init_cp, stcb);
1562                         if (retval < 0) {
1563                                 if (how_indx < sizeof(asoc->cookie_how))
1564                                         asoc->cookie_how[how_indx] = 3;
1565                                 return (NULL);
1566                         }
1567                         /* we have already processed the INIT so no problem */
1568                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1569                             stcb, net,
1570                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1571                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1572                             stcb, net,
1573                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1574                         /* update current state */
1575                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1576                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1577                         else
1578                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1579
1580                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1581                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1582                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1583                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1584                         }
1585                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1586                         sctp_stop_all_cookie_timers(stcb);
1587                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1588                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1589                             (inp->sctp_socket->so_qlimit == 0)
1590                             ) {
1591 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1592                                 struct socket *so;
1593
1594 #endif
1595                                 /*
1596                                  * Here is where collision would go if we
1597                                  * did a connect() and instead got a
1598                                  * init/init-ack/cookie done before the
1599                                  * init-ack came back..
1600                                  */
1601                                 stcb->sctp_ep->sctp_flags |=
1602                                     SCTP_PCB_FLAGS_CONNECTED;
1603 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1604                                 so = SCTP_INP_SO(stcb->sctp_ep);
1605                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1606                                 SCTP_TCB_UNLOCK(stcb);
1607                                 SCTP_SOCKET_LOCK(so, 1);
1608                                 SCTP_TCB_LOCK(stcb);
1609                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1610                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1611                                         SCTP_SOCKET_UNLOCK(so, 1);
1612                                         return (NULL);
1613                                 }
1614 #endif
1615                                 soisconnected(stcb->sctp_socket);
1616 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1617                                 SCTP_SOCKET_UNLOCK(so, 1);
1618 #endif
1619                         }
1620                         /* notify upper layer */
1621                         *notification = SCTP_NOTIFY_ASSOC_UP;
1622                         /*
1623                          * since we did not send a HB make sure we don't
1624                          * double things
1625                          */
1626                         net->hb_responded = 1;
1627                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1628                             &cookie->time_entered,
1629                             sctp_align_unsafe_makecopy,
1630                             SCTP_RTT_FROM_NON_DATA);
1631
1632                         if (stcb->asoc.sctp_autoclose_ticks &&
1633                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1634                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1635                                     inp, stcb, NULL);
1636                         }
1637                         break;
1638                 default:
1639                         /*
1640                          * we're in the OPEN state (or beyond), so peer must
1641                          * have simply lost the COOKIE-ACK
1642                          */
1643                         break;
1644                 }               /* end switch */
1645                 sctp_stop_all_cookie_timers(stcb);
1646                 /*
1647                  * We ignore the return code here.. not sure if we should
1648                  * somehow abort.. but we do have an existing asoc. This
1649                  * really should not fail.
1650                  */
1651                 if (sctp_load_addresses_from_init(stcb, m,
1652                     init_offset + sizeof(struct sctp_init_chunk),
1653                     initack_offset, src, dst, init_src)) {
1654                         if (how_indx < sizeof(asoc->cookie_how))
1655                                 asoc->cookie_how[how_indx] = 4;
1656                         return (NULL);
1657                 }
1658                 /* respond with a COOKIE-ACK */
1659                 sctp_toss_old_cookies(stcb, asoc);
1660                 sctp_send_cookie_ack(stcb);
1661                 if (how_indx < sizeof(asoc->cookie_how))
1662                         asoc->cookie_how[how_indx] = 5;
1663                 return (stcb);
1664         }
1665         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1666             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1667             cookie->tie_tag_my_vtag == 0 &&
1668             cookie->tie_tag_peer_vtag == 0) {
1669                 /*
1670                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1671                  */
1672                 if (how_indx < sizeof(asoc->cookie_how))
1673                         asoc->cookie_how[how_indx] = 6;
1674                 return (NULL);
1675         }
1676         /*
1677          * If nat support, and the below and stcb is established, send back
1678          * a ABORT(colliding state) if we are established.
1679          */
1680         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1681             (asoc->peer_supports_nat) &&
1682             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1683             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1684             (asoc->peer_vtag == 0)))) {
1685                 /*
1686                  * Special case - Peer's support nat. We may have two init's
1687                  * that we gave out the same tag on since one was not
1688                  * established.. i.e. we get INIT from host-1 behind the nat
1689                  * and we respond tag-a, we get a INIT from host-2 behind
1690                  * the nat and we get tag-a again. Then we bring up host-1
1691                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1692                  * Now we have colliding state. We must send an abort here
1693                  * with colliding state indication.
1694                  */
1695                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1696                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1697                     mflowtype, mflowid, inp->fibnum,
1698                     vrf_id, port);
1699                 return (NULL);
1700         }
1701         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1702             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1703             (asoc->peer_vtag == 0))) {
1704                 /*
1705                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1706                  * should be ok, re-accept peer info
1707                  */
1708                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1709                         /*
1710                          * Extension of case C. If we hit this, then the
1711                          * random number generator returned the same vtag
1712                          * when we first sent our INIT-ACK and when we later
1713                          * sent our INIT. The side with the seq numbers that
1714                          * are different will be the one that normnally
1715                          * would have hit case C. This in effect "extends"
1716                          * our vtags in this collision case to be 64 bits.
1717                          * The same collision could occur aka you get both
1718                          * vtag and seq number the same twice in a row.. but
1719                          * is much less likely. If it did happen then we
1720                          * would proceed through and bring up the assoc.. we
1721                          * may end up with the wrong stream setup however..
1722                          * which would be bad.. but there is no way to
1723                          * tell.. until we send on a stream that does not
1724                          * exist :-)
1725                          */
1726                         if (how_indx < sizeof(asoc->cookie_how))
1727                                 asoc->cookie_how[how_indx] = 7;
1728
1729                         return (NULL);
1730                 }
1731                 if (how_indx < sizeof(asoc->cookie_how))
1732                         asoc->cookie_how[how_indx] = 8;
1733                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1734                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1735                 sctp_stop_all_cookie_timers(stcb);
1736                 /*
1737                  * since we did not send a HB make sure we don't double
1738                  * things
1739                  */
1740                 net->hb_responded = 1;
1741                 if (stcb->asoc.sctp_autoclose_ticks &&
1742                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1743                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1744                             NULL);
1745                 }
1746                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1747                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1748
1749                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1750                         /*
1751                          * Ok the peer probably discarded our data (if we
1752                          * echoed a cookie+data). So anything on the
1753                          * sent_queue should be marked for retransmit, we
1754                          * may not get something to kick us so it COULD
1755                          * still take a timeout to move these.. but it can't
1756                          * hurt to mark them.
1757                          */
1758                         struct sctp_tmit_chunk *chk;
1759
1760                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1761                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1762                                         chk->sent = SCTP_DATAGRAM_RESEND;
1763                                         sctp_flight_size_decrease(chk);
1764                                         sctp_total_flight_decrease(stcb, chk);
1765                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1766                                         spec_flag++;
1767                                 }
1768                         }
1769
1770                 }
1771                 /* process the INIT info (peer's info) */
1772                 retval = sctp_process_init(init_cp, stcb);
1773                 if (retval < 0) {
1774                         if (how_indx < sizeof(asoc->cookie_how))
1775                                 asoc->cookie_how[how_indx] = 9;
1776                         return (NULL);
1777                 }
1778                 if (sctp_load_addresses_from_init(stcb, m,
1779                     init_offset + sizeof(struct sctp_init_chunk),
1780                     initack_offset, src, dst, init_src)) {
1781                         if (how_indx < sizeof(asoc->cookie_how))
1782                                 asoc->cookie_how[how_indx] = 10;
1783                         return (NULL);
1784                 }
1785                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1786                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1787                         *notification = SCTP_NOTIFY_ASSOC_UP;
1788
1789                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1790                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1791                             (inp->sctp_socket->so_qlimit == 0)) {
1792 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1793                                 struct socket *so;
1794
1795 #endif
1796                                 stcb->sctp_ep->sctp_flags |=
1797                                     SCTP_PCB_FLAGS_CONNECTED;
1798 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1799                                 so = SCTP_INP_SO(stcb->sctp_ep);
1800                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1801                                 SCTP_TCB_UNLOCK(stcb);
1802                                 SCTP_SOCKET_LOCK(so, 1);
1803                                 SCTP_TCB_LOCK(stcb);
1804                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1805                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1806                                         SCTP_SOCKET_UNLOCK(so, 1);
1807                                         return (NULL);
1808                                 }
1809 #endif
1810                                 soisconnected(stcb->sctp_socket);
1811 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1812                                 SCTP_SOCKET_UNLOCK(so, 1);
1813 #endif
1814                         }
1815                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1816                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1817                         else
1818                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1819                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1820                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1821                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1822                 } else {
1823                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1824                 }
1825                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1826                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1827                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1828                             stcb->sctp_ep, stcb, asoc->primary_destination);
1829                 }
1830                 sctp_stop_all_cookie_timers(stcb);
1831                 sctp_toss_old_cookies(stcb, asoc);
1832                 sctp_send_cookie_ack(stcb);
1833                 if (spec_flag) {
1834                         /*
1835                          * only if we have retrans set do we do this. What
1836                          * this call does is get only the COOKIE-ACK out and
1837                          * then when we return the normal call to
1838                          * sctp_chunk_output will get the retrans out behind
1839                          * this.
1840                          */
1841                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1842                 }
1843                 if (how_indx < sizeof(asoc->cookie_how))
1844                         asoc->cookie_how[how_indx] = 11;
1845
1846                 return (stcb);
1847         }
1848         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1849             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1850             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1851             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1852             cookie->tie_tag_peer_vtag != 0) {
1853                 struct sctpasochead *head;
1854
1855 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1856                 struct socket *so;
1857
1858 #endif
1859
1860                 if (asoc->peer_supports_nat) {
1861                         /*
1862                          * This is a gross gross hack. Just call the
1863                          * cookie_new code since we are allowing a duplicate
1864                          * association. I hope this works...
1865                          */
1866                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1867                             sh, cookie, cookie_len,
1868                             inp, netp, init_src, notification,
1869                             auth_skipped, auth_offset, auth_len,
1870                             mflowtype, mflowid,
1871                             vrf_id, port));
1872                 }
1873                 /*
1874                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1875                  */
1876                 /* temp code */
1877                 if (how_indx < sizeof(asoc->cookie_how))
1878                         asoc->cookie_how[how_indx] = 12;
1879                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1880                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1881                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1882                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1883
1884                 /* notify upper layer */
1885                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1886                 atomic_add_int(&stcb->asoc.refcnt, 1);
1887                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1888                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1889                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1890                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1891                 }
1892                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1893                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1894                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1895                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1896                 }
1897                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1898                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1899                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1900                             stcb->sctp_ep, stcb, asoc->primary_destination);
1901
1902                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1903                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1904                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1905                 }
1906                 asoc->pre_open_streams =
1907                     ntohs(initack_cp->init.num_outbound_streams);
1908                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1909                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1910                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1911
1912                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1913
1914                 asoc->str_reset_seq_in = asoc->init_seq_number;
1915
1916                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1917                 if (asoc->mapping_array) {
1918                         memset(asoc->mapping_array, 0,
1919                             asoc->mapping_array_size);
1920                 }
1921                 if (asoc->nr_mapping_array) {
1922                         memset(asoc->nr_mapping_array, 0,
1923                             asoc->mapping_array_size);
1924                 }
1925                 SCTP_TCB_UNLOCK(stcb);
1926 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1927                 so = SCTP_INP_SO(stcb->sctp_ep);
1928                 SCTP_SOCKET_LOCK(so, 1);
1929 #endif
1930                 SCTP_INP_INFO_WLOCK();
1931                 SCTP_INP_WLOCK(stcb->sctp_ep);
1932                 SCTP_TCB_LOCK(stcb);
1933                 atomic_add_int(&stcb->asoc.refcnt, -1);
1934                 /* send up all the data */
1935                 SCTP_TCB_SEND_LOCK(stcb);
1936
1937                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1938                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1939                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1940 #if defined(SCTP_DETAILED_STR_STATS)
1941                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1942                                 asoc->strmout[i].abandoned_sent[j] = 0;
1943                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1944                         }
1945 #else
1946                         asoc->strmout[i].abandoned_sent[0] = 0;
1947                         asoc->strmout[i].abandoned_unsent[0] = 0;
1948 #endif
1949                         stcb->asoc.strmout[i].stream_no = i;
1950                         stcb->asoc.strmout[i].next_sequence_send = 0;
1951                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1952                 }
1953                 /* process the INIT-ACK info (my info) */
1954                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1955                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1956
1957                 /* pull from vtag hash */
1958                 LIST_REMOVE(stcb, sctp_asocs);
1959                 /* re-insert to new vtag position */
1960                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1961                     SCTP_BASE_INFO(hashasocmark))];
1962                 /*
1963                  * put it in the bucket in the vtag hash of assoc's for the
1964                  * system
1965                  */
1966                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1967
1968                 SCTP_TCB_SEND_UNLOCK(stcb);
1969                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1970                 SCTP_INP_INFO_WUNLOCK();
1971 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1972                 SCTP_SOCKET_UNLOCK(so, 1);
1973 #endif
1974                 asoc->total_flight = 0;
1975                 asoc->total_flight_count = 0;
1976                 /* process the INIT info (peer's info) */
1977                 retval = sctp_process_init(init_cp, stcb);
1978                 if (retval < 0) {
1979                         if (how_indx < sizeof(asoc->cookie_how))
1980                                 asoc->cookie_how[how_indx] = 13;
1981
1982                         return (NULL);
1983                 }
1984                 /*
1985                  * since we did not send a HB make sure we don't double
1986                  * things
1987                  */
1988                 net->hb_responded = 1;
1989
1990                 if (sctp_load_addresses_from_init(stcb, m,
1991                     init_offset + sizeof(struct sctp_init_chunk),
1992                     initack_offset, src, dst, init_src)) {
1993                         if (how_indx < sizeof(asoc->cookie_how))
1994                                 asoc->cookie_how[how_indx] = 14;
1995
1996                         return (NULL);
1997                 }
1998                 /* respond with a COOKIE-ACK */
1999                 sctp_stop_all_cookie_timers(stcb);
2000                 sctp_toss_old_cookies(stcb, asoc);
2001                 sctp_send_cookie_ack(stcb);
2002                 if (how_indx < sizeof(asoc->cookie_how))
2003                         asoc->cookie_how[how_indx] = 15;
2004
2005                 return (stcb);
2006         }
2007         if (how_indx < sizeof(asoc->cookie_how))
2008                 asoc->cookie_how[how_indx] = 16;
2009         /* all other cases... */
2010         return (NULL);
2011 }
2012
2013
2014 /*
2015  * handle a state cookie for a new association m: input packet mbuf chain--
2016  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2017  * and the cookie signature does not exist offset: offset into mbuf to the
2018  * cookie-echo chunk length: length of the cookie chunk to: where the init
2019  * was from returns a new TCB
2020  */
2021 static struct sctp_tcb *
2022 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2023     struct sockaddr *src, struct sockaddr *dst,
2024     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2025     struct sctp_inpcb *inp, struct sctp_nets **netp,
2026     struct sockaddr *init_src, int *notification,
2027     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2028     uint8_t mflowtype, uint32_t mflowid,
2029     uint32_t vrf_id, uint16_t port)
2030 {
2031         struct sctp_tcb *stcb;
2032         struct sctp_init_chunk *init_cp, init_buf;
2033         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2034         union sctp_sockstore store;
2035         struct sctp_association *asoc;
2036         int init_offset, initack_offset, initack_limit;
2037         int retval;
2038         int error = 0;
2039         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2040
2041 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2042         struct socket *so;
2043
2044         so = SCTP_INP_SO(inp);
2045 #endif
2046
2047         /*
2048          * find and validate the INIT chunk in the cookie (peer's info) the
2049          * INIT should start after the cookie-echo header struct (chunk
2050          * header, state cookie header struct)
2051          */
2052         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2053         init_cp = (struct sctp_init_chunk *)
2054             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2055             (uint8_t *) & init_buf);
2056         if (init_cp == NULL) {
2057                 /* could not pull a INIT chunk in cookie */
2058                 SCTPDBG(SCTP_DEBUG_INPUT1,
2059                     "process_cookie_new: could not pull INIT chunk hdr\n");
2060                 return (NULL);
2061         }
2062         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2063                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2064                 return (NULL);
2065         }
2066         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2067         /*
2068          * find and validate the INIT-ACK chunk in the cookie (my info) the
2069          * INIT-ACK follows the INIT chunk
2070          */
2071         initack_cp = (struct sctp_init_ack_chunk *)
2072             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2073             (uint8_t *) & initack_buf);
2074         if (initack_cp == NULL) {
2075                 /* could not pull INIT-ACK chunk in cookie */
2076                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2077                 return (NULL);
2078         }
2079         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2080                 return (NULL);
2081         }
2082         /*
2083          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2084          * "initack_limit" value.  This is because the chk_length field
2085          * includes the length of the cookie, but the cookie is omitted when
2086          * the INIT and INIT_ACK are tacked onto the cookie...
2087          */
2088         initack_limit = offset + cookie_len;
2089
2090         /*
2091          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2092          * and popluate
2093          */
2094
2095         /*
2096          * Here we do a trick, we set in NULL for the proc/thread argument.
2097          * We do this since in effect we only use the p argument when the
2098          * socket is unbound and we must do an implicit bind. Since we are
2099          * getting a cookie, we cannot be unbound.
2100          */
2101         stcb = sctp_aloc_assoc(inp, init_src, &error,
2102             ntohl(initack_cp->init.initiate_tag), vrf_id,
2103             (struct thread *)NULL
2104             );
2105         if (stcb == NULL) {
2106                 struct mbuf *op_err;
2107
2108                 /* memory problem? */
2109                 SCTPDBG(SCTP_DEBUG_INPUT1,
2110                     "process_cookie_new: no room for another TCB!\n");
2111                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2112                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2113                     src, dst, sh, op_err,
2114                     mflowtype, mflowid,
2115                     vrf_id, port);
2116                 return (NULL);
2117         }
2118         /* get the correct sctp_nets */
2119         if (netp)
2120                 *netp = sctp_findnet(stcb, init_src);
2121
2122         asoc = &stcb->asoc;
2123         /* get scope variables out of cookie */
2124         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2125         asoc->scope.site_scope = cookie->site_scope;
2126         asoc->scope.local_scope = cookie->local_scope;
2127         asoc->scope.loopback_scope = cookie->loopback_scope;
2128
2129         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2130             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2131                 struct mbuf *op_err;
2132
2133                 /*
2134                  * Houston we have a problem. The EP changed while the
2135                  * cookie was in flight. Only recourse is to abort the
2136                  * association.
2137                  */
2138                 atomic_add_int(&stcb->asoc.refcnt, 1);
2139                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2140                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2141                     src, dst, sh, op_err,
2142                     mflowtype, mflowid,
2143                     vrf_id, port);
2144 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2145                 SCTP_TCB_UNLOCK(stcb);
2146                 SCTP_SOCKET_LOCK(so, 1);
2147                 SCTP_TCB_LOCK(stcb);
2148 #endif
2149                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2150                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2151 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2152                 SCTP_SOCKET_UNLOCK(so, 1);
2153 #endif
2154                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2155                 return (NULL);
2156         }
2157         /* process the INIT-ACK info (my info) */
2158         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2159         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2160         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2161         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2162         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2163         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2164         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2165         asoc->str_reset_seq_in = asoc->init_seq_number;
2166
2167         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2168
2169         /* process the INIT info (peer's info) */
2170         if (netp)
2171                 retval = sctp_process_init(init_cp, stcb);
2172         else
2173                 retval = 0;
2174         if (retval < 0) {
2175                 atomic_add_int(&stcb->asoc.refcnt, 1);
2176 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2177                 SCTP_TCB_UNLOCK(stcb);
2178                 SCTP_SOCKET_LOCK(so, 1);
2179                 SCTP_TCB_LOCK(stcb);
2180 #endif
2181                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2182                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2183 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2184                 SCTP_SOCKET_UNLOCK(so, 1);
2185 #endif
2186                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2187                 return (NULL);
2188         }
2189         /* load all addresses */
2190         if (sctp_load_addresses_from_init(stcb, m,
2191             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2192             src, dst, init_src)) {
2193                 atomic_add_int(&stcb->asoc.refcnt, 1);
2194 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2195                 SCTP_TCB_UNLOCK(stcb);
2196                 SCTP_SOCKET_LOCK(so, 1);
2197                 SCTP_TCB_LOCK(stcb);
2198 #endif
2199                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2200                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2201 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2202                 SCTP_SOCKET_UNLOCK(so, 1);
2203 #endif
2204                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2205                 return (NULL);
2206         }
2207         /*
2208          * verify any preceding AUTH chunk that was skipped
2209          */
2210         /* pull the local authentication parameters from the cookie/init-ack */
2211         sctp_auth_get_cookie_params(stcb, m,
2212             initack_offset + sizeof(struct sctp_init_ack_chunk),
2213             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2214         if (auth_skipped) {
2215                 struct sctp_auth_chunk *auth;
2216
2217                 auth = (struct sctp_auth_chunk *)
2218                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2219                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2220                         /* auth HMAC failed, dump the assoc and packet */
2221                         SCTPDBG(SCTP_DEBUG_AUTH1,
2222                             "COOKIE-ECHO: AUTH failed\n");
2223                         atomic_add_int(&stcb->asoc.refcnt, 1);
2224 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2225                         SCTP_TCB_UNLOCK(stcb);
2226                         SCTP_SOCKET_LOCK(so, 1);
2227                         SCTP_TCB_LOCK(stcb);
2228 #endif
2229                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2230                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2231 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2232                         SCTP_SOCKET_UNLOCK(so, 1);
2233 #endif
2234                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2235                         return (NULL);
2236                 } else {
2237                         /* remaining chunks checked... good to go */
2238                         stcb->asoc.authenticated = 1;
2239                 }
2240         }
2241         /* update current state */
2242         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2243         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2244         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2245                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2246                     stcb->sctp_ep, stcb, asoc->primary_destination);
2247         }
2248         sctp_stop_all_cookie_timers(stcb);
2249         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2250         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2251
2252         /*
2253          * if we're doing ASCONFs, check to see if we have any new local
2254          * addresses that need to get added to the peer (eg. addresses
2255          * changed while cookie echo in flight).  This needs to be done
2256          * after we go to the OPEN state to do the correct asconf
2257          * processing. else, make sure we have the correct addresses in our
2258          * lists
2259          */
2260
2261         /* warning, we re-use sin, sin6, sa_store here! */
2262         /* pull in local_address (our "from" address) */
2263         switch (cookie->laddr_type) {
2264 #ifdef INET
2265         case SCTP_IPV4_ADDRESS:
2266                 /* source addr is IPv4 */
2267                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2268                 store.sin.sin_family = AF_INET;
2269                 store.sin.sin_len = sizeof(struct sockaddr_in);
2270                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2271                 break;
2272 #endif
2273 #ifdef INET6
2274         case SCTP_IPV6_ADDRESS:
2275                 /* source addr is IPv6 */
2276                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2277                 store.sin6.sin6_family = AF_INET6;
2278                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2279                 store.sin6.sin6_scope_id = cookie->scope_id;
2280                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2281                 break;
2282 #endif
2283         default:
2284                 atomic_add_int(&stcb->asoc.refcnt, 1);
2285 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2286                 SCTP_TCB_UNLOCK(stcb);
2287                 SCTP_SOCKET_LOCK(so, 1);
2288                 SCTP_TCB_LOCK(stcb);
2289 #endif
2290                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2291                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2292 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2293                 SCTP_SOCKET_UNLOCK(so, 1);
2294 #endif
2295                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2296                 return (NULL);
2297         }
2298
2299         /* set up to notify upper layer */
2300         *notification = SCTP_NOTIFY_ASSOC_UP;
2301         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2302             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2303             (inp->sctp_socket->so_qlimit == 0)) {
2304                 /*
2305                  * This is an endpoint that called connect() how it got a
2306                  * cookie that is NEW is a bit of a mystery. It must be that
2307                  * the INIT was sent, but before it got there.. a complete
2308                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2309                  * should have went to the other code.. not here.. oh well..
2310                  * a bit of protection is worth having..
2311                  */
2312                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2313 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2314                 atomic_add_int(&stcb->asoc.refcnt, 1);
2315                 SCTP_TCB_UNLOCK(stcb);
2316                 SCTP_SOCKET_LOCK(so, 1);
2317                 SCTP_TCB_LOCK(stcb);
2318                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2319                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2320                         SCTP_SOCKET_UNLOCK(so, 1);
2321                         return (NULL);
2322                 }
2323 #endif
2324                 soisconnected(stcb->sctp_socket);
2325 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2326                 SCTP_SOCKET_UNLOCK(so, 1);
2327 #endif
2328         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2329             (inp->sctp_socket->so_qlimit)) {
2330                 /*
2331                  * We don't want to do anything with this one. Since it is
2332                  * the listening guy. The timer will get started for
2333                  * accepted connections in the caller.
2334                  */
2335                 ;
2336         }
2337         /* since we did not send a HB make sure we don't double things */
2338         if ((netp) && (*netp))
2339                 (*netp)->hb_responded = 1;
2340
2341         if (stcb->asoc.sctp_autoclose_ticks &&
2342             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2343                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2344         }
2345         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2346         if ((netp) && (*netp)) {
2347                 /* calculate the RTT and set the encaps port */
2348                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2349                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2350                     SCTP_RTT_FROM_NON_DATA);
2351                 (*netp)->port = port;
2352         }
2353         /* respond with a COOKIE-ACK */
2354         sctp_send_cookie_ack(stcb);
2355
2356         /*
2357          * check the address lists for any ASCONFs that need to be sent
2358          * AFTER the cookie-ack is sent
2359          */
2360         sctp_check_address_list(stcb, m,
2361             initack_offset + sizeof(struct sctp_init_ack_chunk),
2362             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2363             &store.sa, cookie->local_scope, cookie->site_scope,
2364             cookie->ipv4_scope, cookie->loopback_scope);
2365
2366
2367         return (stcb);
2368 }
2369
2370 /*
2371  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2372  * we NEED to make sure we are not already using the vtag. If so we
2373  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2374         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2375                                                             SCTP_BASE_INFO(hashasocmark))];
2376         LIST_FOREACH(stcb, head, sctp_asocs) {
2377                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2378                        -- SEND ABORT - TRY AGAIN --
2379                 }
2380         }
2381 */
2382
2383 /*
2384  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2385  * existing (non-NULL) TCB
2386  */
2387 static struct mbuf *
2388 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2389     struct sockaddr *src, struct sockaddr *dst,
2390     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2391     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2392     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2393     struct sctp_tcb **locked_tcb,
2394     uint8_t mflowtype, uint32_t mflowid,
2395     uint32_t vrf_id, uint16_t port)
2396 {
2397         struct sctp_state_cookie *cookie;
2398         struct sctp_tcb *l_stcb = *stcb;
2399         struct sctp_inpcb *l_inp;
2400         struct sockaddr *to;
2401         struct sctp_pcb *ep;
2402         struct mbuf *m_sig;
2403         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2404         uint8_t *sig;
2405         uint8_t cookie_ok = 0;
2406         unsigned int sig_offset, cookie_offset;
2407         unsigned int cookie_len;
2408         struct timeval now;
2409         struct timeval time_expires;
2410         int notification = 0;
2411         struct sctp_nets *netl;
2412         int had_a_existing_tcb = 0;
2413         int send_int_conf = 0;
2414
2415 #ifdef INET
2416         struct sockaddr_in sin;
2417
2418 #endif
2419 #ifdef INET6
2420         struct sockaddr_in6 sin6;
2421
2422 #endif
2423
2424         SCTPDBG(SCTP_DEBUG_INPUT2,
2425             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2426
2427         if (inp_p == NULL) {
2428                 return (NULL);
2429         }
2430         cookie = &cp->cookie;
2431         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2432         cookie_len = ntohs(cp->ch.chunk_length);
2433
2434         if ((cookie->peerport != sh->src_port) &&
2435             (cookie->myport != sh->dest_port) &&
2436             (cookie->my_vtag != sh->v_tag)) {
2437                 /*
2438                  * invalid ports or bad tag.  Note that we always leave the
2439                  * v_tag in the header in network order and when we stored
2440                  * it in the my_vtag slot we also left it in network order.
2441                  * This maintains the match even though it may be in the
2442                  * opposite byte order of the machine :->
2443                  */
2444                 return (NULL);
2445         }
2446         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2447             sizeof(struct sctp_init_chunk) +
2448             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2449                 /* cookie too small */
2450                 return (NULL);
2451         }
2452         /*
2453          * split off the signature into its own mbuf (since it should not be
2454          * calculated in the sctp_hmac_m() call).
2455          */
2456         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2457         m_sig = m_split(m, sig_offset, M_NOWAIT);
2458         if (m_sig == NULL) {
2459                 /* out of memory or ?? */
2460                 return (NULL);
2461         }
2462 #ifdef SCTP_MBUF_LOGGING
2463         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2464                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2465         }
2466 #endif
2467
2468         /*
2469          * compute the signature/digest for the cookie
2470          */
2471         ep = &(*inp_p)->sctp_ep;
2472         l_inp = *inp_p;
2473         if (l_stcb) {
2474                 SCTP_TCB_UNLOCK(l_stcb);
2475         }
2476         SCTP_INP_RLOCK(l_inp);
2477         if (l_stcb) {
2478                 SCTP_TCB_LOCK(l_stcb);
2479         }
2480         /* which cookie is it? */
2481         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2482             (ep->current_secret_number != ep->last_secret_number)) {
2483                 /* it's the old cookie */
2484                 (void)sctp_hmac_m(SCTP_HMAC,
2485                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2486                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2487         } else {
2488                 /* it's the current cookie */
2489                 (void)sctp_hmac_m(SCTP_HMAC,
2490                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2491                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2492         }
2493         /* get the signature */
2494         SCTP_INP_RUNLOCK(l_inp);
2495         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2496         if (sig == NULL) {
2497                 /* couldn't find signature */
2498                 sctp_m_freem(m_sig);
2499                 return (NULL);
2500         }
2501         /* compare the received digest with the computed digest */
2502         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2503                 /* try the old cookie? */
2504                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2505                     (ep->current_secret_number != ep->last_secret_number)) {
2506                         /* compute digest with old */
2507                         (void)sctp_hmac_m(SCTP_HMAC,
2508                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2509                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2510                         /* compare */
2511                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2512                                 cookie_ok = 1;
2513                 }
2514         } else {
2515                 cookie_ok = 1;
2516         }
2517
2518         /*
2519          * Now before we continue we must reconstruct our mbuf so that
2520          * normal processing of any other chunks will work.
2521          */
2522         {
2523                 struct mbuf *m_at;
2524
2525                 m_at = m;
2526                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2527                         m_at = SCTP_BUF_NEXT(m_at);
2528                 }
2529                 SCTP_BUF_NEXT(m_at) = m_sig;
2530         }
2531
2532         if (cookie_ok == 0) {
2533                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2534                 SCTPDBG(SCTP_DEBUG_INPUT2,
2535                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2536                     (uint32_t) offset, cookie_offset, sig_offset);
2537                 return (NULL);
2538         }
2539         /*
2540          * check the cookie timestamps to be sure it's not stale
2541          */
2542         (void)SCTP_GETTIME_TIMEVAL(&now);
2543         /* Expire time is in Ticks, so we convert to seconds */
2544         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2545         time_expires.tv_usec = cookie->time_entered.tv_usec;
2546         /*
2547          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2548          * is undefined.
2549          */
2550         if (timevalcmp(&now, &time_expires, >)) {
2551                 /* cookie is stale! */
2552                 struct mbuf *op_err;
2553                 struct sctp_stale_cookie_msg *scm;
2554                 uint32_t tim;
2555
2556                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2557                     0, M_NOWAIT, 1, MT_DATA);
2558                 if (op_err == NULL) {
2559                         /* FOOBAR */
2560                         return (NULL);
2561                 }
2562                 /* Set the len */
2563                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2564                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2565                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2566                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2567                     (sizeof(uint32_t))));
2568                 /* seconds to usec */
2569                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2570                 /* add in usec */
2571                 if (tim == 0)
2572                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2573                 scm->time_usec = htonl(tim);
2574                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2575                     mflowtype, mflowid, l_inp->fibnum,
2576                     vrf_id, port);
2577                 return (NULL);
2578         }
2579         /*
2580          * Now we must see with the lookup address if we have an existing
2581          * asoc. This will only happen if we were in the COOKIE-WAIT state
2582          * and a INIT collided with us and somewhere the peer sent the
2583          * cookie on another address besides the single address our assoc
2584          * had for him. In this case we will have one of the tie-tags set at
2585          * least AND the address field in the cookie can be used to look it
2586          * up.
2587          */
2588         to = NULL;
2589         switch (cookie->addr_type) {
2590 #ifdef INET6
2591         case SCTP_IPV6_ADDRESS:
2592                 memset(&sin6, 0, sizeof(sin6));
2593                 sin6.sin6_family = AF_INET6;
2594                 sin6.sin6_len = sizeof(sin6);
2595                 sin6.sin6_port = sh->src_port;
2596                 sin6.sin6_scope_id = cookie->scope_id;
2597                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2598                     sizeof(sin6.sin6_addr.s6_addr));
2599                 to = (struct sockaddr *)&sin6;
2600                 break;
2601 #endif
2602 #ifdef INET
2603         case SCTP_IPV4_ADDRESS:
2604                 memset(&sin, 0, sizeof(sin));
2605                 sin.sin_family = AF_INET;
2606                 sin.sin_len = sizeof(sin);
2607                 sin.sin_port = sh->src_port;
2608                 sin.sin_addr.s_addr = cookie->address[0];
2609                 to = (struct sockaddr *)&sin;
2610                 break;
2611 #endif
2612         default:
2613                 /* This should not happen */
2614                 return (NULL);
2615         }
2616         if (*stcb == NULL) {
2617                 /* Yep, lets check */
2618                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2619                 if (*stcb == NULL) {
2620                         /*
2621                          * We should have only got back the same inp. If we
2622                          * got back a different ep we have a problem. The
2623                          * original findep got back l_inp and now
2624                          */
2625                         if (l_inp != *inp_p) {
2626                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2627                         }
2628                 } else {
2629                         if (*locked_tcb == NULL) {
2630                                 /*
2631                                  * In this case we found the assoc only
2632                                  * after we locked the create lock. This
2633                                  * means we are in a colliding case and we
2634                                  * must make sure that we unlock the tcb if
2635                                  * its one of the cases where we throw away
2636                                  * the incoming packets.
2637                                  */
2638                                 *locked_tcb = *stcb;
2639
2640                                 /*
2641                                  * We must also increment the inp ref count
2642                                  * since the ref_count flags was set when we
2643                                  * did not find the TCB, now we found it
2644                                  * which reduces the refcount.. we must
2645                                  * raise it back out to balance it all :-)
2646                                  */
2647                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2648                                 if ((*stcb)->sctp_ep != l_inp) {
2649                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2650                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2651                                 }
2652                         }
2653                 }
2654         }
2655         cookie_len -= SCTP_SIGNATURE_SIZE;
2656         if (*stcb == NULL) {
2657                 /* this is the "normal" case... get a new TCB */
2658                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2659                     cookie, cookie_len, *inp_p,
2660                     netp, to, &notification,
2661                     auth_skipped, auth_offset, auth_len,
2662                     mflowtype, mflowid,
2663                     vrf_id, port);
2664         } else {
2665                 /* this is abnormal... cookie-echo on existing TCB */
2666                 had_a_existing_tcb = 1;
2667                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2668                     src, dst, sh,
2669                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2670                     &notification, auth_skipped, auth_offset, auth_len,
2671                     mflowtype, mflowid,
2672                     vrf_id, port);
2673         }
2674
2675         if (*stcb == NULL) {
2676                 /* still no TCB... must be bad cookie-echo */
2677                 return (NULL);
2678         }
2679         if (*netp != NULL) {
2680                 (*netp)->flowtype = mflowtype;
2681                 (*netp)->flowid = mflowid;
2682         }
2683         /*
2684          * Ok, we built an association so confirm the address we sent the
2685          * INIT-ACK to.
2686          */
2687         netl = sctp_findnet(*stcb, to);
2688         /*
2689          * This code should in theory NOT run but
2690          */
2691         if (netl == NULL) {
2692                 /* TSNH! Huh, why do I need to add this address here? */
2693                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2694                         return (NULL);
2695                 }
2696                 netl = sctp_findnet(*stcb, to);
2697         }
2698         if (netl) {
2699                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2700                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2701                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2702                             netl);
2703                         send_int_conf = 1;
2704                 }
2705         }
2706         sctp_start_net_timers(*stcb);
2707         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2708                 if (!had_a_existing_tcb ||
2709                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2710                         /*
2711                          * If we have a NEW cookie or the connect never
2712                          * reached the connected state during collision we
2713                          * must do the TCP accept thing.
2714                          */
2715                         struct socket *so, *oso;
2716                         struct sctp_inpcb *inp;
2717
2718                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2719                                 /*
2720                                  * For a restart we will keep the same
2721                                  * socket, no need to do anything. I THINK!!
2722                                  */
2723                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2724                                 if (send_int_conf) {
2725                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2726                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2727                                 }
2728                                 return (m);
2729                         }
2730                         oso = (*inp_p)->sctp_socket;
2731                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2732                         SCTP_TCB_UNLOCK((*stcb));
2733                         CURVNET_SET(oso->so_vnet);
2734                         so = sonewconn(oso, 0
2735                             );
2736                         CURVNET_RESTORE();
2737                         SCTP_TCB_LOCK((*stcb));
2738                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2739
2740                         if (so == NULL) {
2741                                 struct mbuf *op_err;
2742
2743 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2744                                 struct socket *pcb_so;
2745
2746 #endif
2747                                 /* Too many sockets */
2748                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2749                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2750                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2751                                     src, dst, sh, op_err,
2752                                     mflowtype, mflowid,
2753                                     vrf_id, port);
2754 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2755                                 pcb_so = SCTP_INP_SO(*inp_p);
2756                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2757                                 SCTP_TCB_UNLOCK((*stcb));
2758                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2759                                 SCTP_TCB_LOCK((*stcb));
2760                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2761 #endif
2762                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2763                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2764 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2765                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2766 #endif
2767                                 return (NULL);
2768                         }
2769                         inp = (struct sctp_inpcb *)so->so_pcb;
2770                         SCTP_INP_INCR_REF(inp);
2771                         /*
2772                          * We add the unbound flag here so that if we get an
2773                          * soabort() before we get the move_pcb done, we
2774                          * will properly cleanup.
2775                          */
2776                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2777                             SCTP_PCB_FLAGS_CONNECTED |
2778                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2779                             SCTP_PCB_FLAGS_UNBOUND |
2780                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2781                             SCTP_PCB_FLAGS_DONT_WAKE);
2782                         inp->sctp_features = (*inp_p)->sctp_features;
2783                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2784                         inp->sctp_socket = so;
2785                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2786                         inp->max_cwnd = (*inp_p)->max_cwnd;
2787                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2788                         inp->ecn_supported = (*inp_p)->ecn_supported;
2789                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2790                         inp->auth_supported = (*inp_p)->auth_supported;
2791                         inp->asconf_supported = (*inp_p)->asconf_supported;
2792                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2793                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2794                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2795                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2796                         inp->sctp_context = (*inp_p)->sctp_context;
2797                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2798                         inp->fibnum = (*inp_p)->fibnum;
2799                         inp->inp_starting_point_for_iterator = NULL;
2800                         /*
2801                          * copy in the authentication parameters from the
2802                          * original endpoint
2803                          */
2804                         if (inp->sctp_ep.local_hmacs)
2805                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2806                         inp->sctp_ep.local_hmacs =
2807                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2808                         if (inp->sctp_ep.local_auth_chunks)
2809                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2810                         inp->sctp_ep.local_auth_chunks =
2811                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2812
2813                         /*
2814                          * Now we must move it from one hash table to
2815                          * another and get the tcb in the right place.
2816                          */
2817
2818                         /*
2819                          * This is where the one-2-one socket is put into
2820                          * the accept state waiting for the accept!
2821                          */
2822                         if (*stcb) {
2823                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2824                         }
2825                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2826
2827                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2828                         SCTP_TCB_UNLOCK((*stcb));
2829
2830                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2831                             0);
2832                         SCTP_TCB_LOCK((*stcb));
2833                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2834
2835
2836                         /*
2837                          * now we must check to see if we were aborted while
2838                          * the move was going on and the lock/unlock
2839                          * happened.
2840                          */
2841                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2842                                 /*
2843                                  * yep it was, we leave the assoc attached
2844                                  * to the socket since the sctp_inpcb_free()
2845                                  * call will send an abort for us.
2846                                  */
2847                                 SCTP_INP_DECR_REF(inp);
2848                                 return (NULL);
2849                         }
2850                         SCTP_INP_DECR_REF(inp);
2851                         /* Switch over to the new guy */
2852                         *inp_p = inp;
2853                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2854                         if (send_int_conf) {
2855                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2856                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2857                         }
2858                         /*
2859                          * Pull it from the incomplete queue and wake the
2860                          * guy
2861                          */
2862 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2863                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2864                         SCTP_TCB_UNLOCK((*stcb));
2865                         SCTP_SOCKET_LOCK(so, 1);
2866 #endif
2867                         soisconnected(so);
2868 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2869                         SCTP_TCB_LOCK((*stcb));
2870                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2871                         SCTP_SOCKET_UNLOCK(so, 1);
2872 #endif
2873                         return (m);
2874                 }
2875         }
2876         if (notification) {
2877                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2878         }
2879         if (send_int_conf) {
2880                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2881                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2882         }
2883         return (m);
2884 }
2885
2886 static void
2887 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2888     struct sctp_tcb *stcb, struct sctp_nets *net)
2889 {
2890         /* cp must not be used, others call this without a c-ack :-) */
2891         struct sctp_association *asoc;
2892
2893         SCTPDBG(SCTP_DEBUG_INPUT2,
2894             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2895         if ((stcb == NULL) || (net == NULL)) {
2896                 return;
2897         }
2898         asoc = &stcb->asoc;
2899
2900         sctp_stop_all_cookie_timers(stcb);
2901         /* process according to association state */
2902         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2903                 /* state change only needed when I am in right state */
2904                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2905                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2906                 sctp_start_net_timers(stcb);
2907                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2908                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2909                             stcb->sctp_ep, stcb, asoc->primary_destination);
2910
2911                 }
2912                 /* update RTO */
2913                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2914                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2915                 if (asoc->overall_error_count == 0) {
2916                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2917                             &asoc->time_entered, sctp_align_safe_nocopy,
2918                             SCTP_RTT_FROM_NON_DATA);
2919                 }
2920                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2921                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2922                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2923                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2924 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2925                         struct socket *so;
2926
2927 #endif
2928                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2929 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2930                         so = SCTP_INP_SO(stcb->sctp_ep);
2931                         atomic_add_int(&stcb->asoc.refcnt, 1);
2932                         SCTP_TCB_UNLOCK(stcb);
2933                         SCTP_SOCKET_LOCK(so, 1);
2934                         SCTP_TCB_LOCK(stcb);
2935                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2936 #endif
2937                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2938                                 soisconnected(stcb->sctp_socket);
2939                         }
2940 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2941                         SCTP_SOCKET_UNLOCK(so, 1);
2942 #endif
2943                 }
2944                 /*
2945                  * since we did not send a HB make sure we don't double
2946                  * things
2947                  */
2948                 net->hb_responded = 1;
2949
2950                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2951                         /*
2952                          * We don't need to do the asconf thing, nor hb or
2953                          * autoclose if the socket is closed.
2954                          */
2955                         goto closed_socket;
2956                 }
2957                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2958                     stcb, net);
2959
2960
2961                 if (stcb->asoc.sctp_autoclose_ticks &&
2962                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2963                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2964                             stcb->sctp_ep, stcb, NULL);
2965                 }
2966                 /*
2967                  * send ASCONF if parameters are pending and ASCONFs are
2968                  * allowed (eg. addresses changed when init/cookie echo were
2969                  * in flight)
2970                  */
2971                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2972                     (stcb->asoc.asconf_supported == 1) &&
2973                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2974 #ifdef SCTP_TIMER_BASED_ASCONF
2975                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2976                             stcb->sctp_ep, stcb,
2977                             stcb->asoc.primary_destination);
2978 #else
2979                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2980                             SCTP_ADDR_NOT_LOCKED);
2981 #endif
2982                 }
2983         }
2984 closed_socket:
2985         /* Toss the cookie if I can */
2986         sctp_toss_old_cookies(stcb, asoc);
2987         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2988                 /* Restart the timer if we have pending data */
2989                 struct sctp_tmit_chunk *chk;
2990
2991                 chk = TAILQ_FIRST(&asoc->sent_queue);
2992                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2993         }
2994 }
2995
2996 static void
2997 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2998     struct sctp_tcb *stcb)
2999 {
3000         struct sctp_nets *net;
3001         struct sctp_tmit_chunk *lchk;
3002         struct sctp_ecne_chunk bkup;
3003         uint8_t override_bit;
3004         uint32_t tsn, window_data_tsn;
3005         int len;
3006         unsigned int pkt_cnt;
3007
3008         len = ntohs(cp->ch.chunk_length);
3009         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3010             (len != sizeof(struct old_sctp_ecne_chunk))) {
3011                 return;
3012         }
3013         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3014                 /* Its the old format */
3015                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3016                 bkup.num_pkts_since_cwr = htonl(1);
3017                 cp = &bkup;
3018         }
3019         SCTP_STAT_INCR(sctps_recvecne);
3020         tsn = ntohl(cp->tsn);
3021         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3022         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3023         if (lchk == NULL) {
3024                 window_data_tsn = stcb->asoc.sending_seq - 1;
3025         } else {
3026                 window_data_tsn = lchk->rec.data.TSN_seq;
3027         }
3028
3029         /* Find where it was sent to if possible. */
3030         net = NULL;
3031         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3032                 if (lchk->rec.data.TSN_seq == tsn) {
3033                         net = lchk->whoTo;
3034                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3035                         break;
3036                 }
3037                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3038                         break;
3039                 }
3040         }
3041         if (net == NULL) {
3042                 /*
3043                  * What to do. A previous send of a CWR was possibly lost.
3044                  * See how old it is, we may have it marked on the actual
3045                  * net.
3046                  */
3047                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3048                         if (tsn == net->last_cwr_tsn) {
3049                                 /* Found him, send it off */
3050                                 break;
3051                         }
3052                 }
3053                 if (net == NULL) {
3054                         /*
3055                          * If we reach here, we need to send a special CWR
3056                          * that says hey, we did this a long time ago and
3057                          * you lost the response.
3058                          */
3059                         net = TAILQ_FIRST(&stcb->asoc.nets);
3060                         if (net == NULL) {
3061                                 /* TSNH */
3062                                 return;
3063                         }
3064                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3065                 } else {
3066                         override_bit = 0;
3067                 }
3068         } else {
3069                 override_bit = 0;
3070         }
3071         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3072             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3073                 /*
3074                  * JRS - Use the congestion control given in the pluggable
3075                  * CC module
3076                  */
3077                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3078                 /*
3079                  * We reduce once every RTT. So we will only lower cwnd at
3080                  * the next sending seq i.e. the window_data_tsn
3081                  */
3082                 net->cwr_window_tsn = window_data_tsn;
3083                 net->ecn_ce_pkt_cnt += pkt_cnt;
3084                 net->lost_cnt = pkt_cnt;
3085                 net->last_cwr_tsn = tsn;
3086         } else {
3087                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3088                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3089                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3090                         /*
3091                          * Another loss in the same window update how many
3092                          * marks/packets lost we have had.
3093                          */
3094                         int cnt = 1;
3095
3096                         if (pkt_cnt > net->lost_cnt) {
3097                                 /* Should be the case */
3098                                 cnt = (pkt_cnt - net->lost_cnt);
3099                                 net->ecn_ce_pkt_cnt += cnt;
3100                         }
3101                         net->lost_cnt = pkt_cnt;
3102                         net->last_cwr_tsn = tsn;
3103                         /*
3104                          * Most CC functions will ignore this call, since we
3105                          * are in-window yet of the initial CE the peer saw.
3106                          */
3107                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3108                 }
3109         }
3110         /*
3111          * We always send a CWR this way if our previous one was lost our
3112          * peer will get an update, or if it is not time again to reduce we
3113          * still get the cwr to the peer. Note we set the override when we
3114          * could not find the TSN on the chunk or the destination network.
3115          */
3116         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3117 }
3118
3119 static void
3120 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3121 {
3122         /*
3123          * Here we get a CWR from the peer. We must look in the outqueue and
3124          * make sure that we have a covered ECNE in the control chunk part.
3125          * If so remove it.
3126          */
3127         struct sctp_tmit_chunk *chk;
3128         struct sctp_ecne_chunk *ecne;
3129         int override;
3130         uint32_t cwr_tsn;
3131
3132         cwr_tsn = ntohl(cp->tsn);
3133         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3134         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3135                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3136                         continue;
3137                 }
3138                 if ((override == 0) && (chk->whoTo != net)) {
3139                         /* Must be from the right src unless override is set */
3140                         continue;
3141                 }
3142                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3143                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3144                         /* this covers this ECNE, we can remove it */
3145                         stcb->asoc.ecn_echo_cnt_onq--;
3146                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3147                             sctp_next);
3148                         sctp_m_freem(chk->data);
3149                         chk->data = NULL;
3150                         stcb->asoc.ctrl_queue_cnt--;
3151                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3152                         if (override == 0) {
3153                                 break;
3154                         }
3155                 }
3156         }
3157 }
3158
3159 static void
3160 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3161     struct sctp_tcb *stcb, struct sctp_nets *net)
3162 {
3163         struct sctp_association *asoc;
3164
3165 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3166         struct socket *so;
3167
3168 #endif
3169
3170         SCTPDBG(SCTP_DEBUG_INPUT2,
3171             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3172         if (stcb == NULL)
3173                 return;
3174
3175         asoc = &stcb->asoc;
3176         /* process according to association state */
3177         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3178                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3179                 SCTPDBG(SCTP_DEBUG_INPUT2,
3180                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3181                 SCTP_TCB_UNLOCK(stcb);
3182                 return;
3183         }
3184         /* notify upper layer protocol */
3185         if (stcb->sctp_socket) {
3186                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3187         }
3188 #ifdef INVARIANTS
3189         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3190             !TAILQ_EMPTY(&asoc->sent_queue) ||
3191             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3192                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3193         }
3194 #endif
3195         /* stop the timer */
3196         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3197             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3198         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3199         /* free the TCB */
3200         SCTPDBG(SCTP_DEBUG_INPUT2,
3201             "sctp_handle_shutdown_complete: calls free-asoc\n");
3202 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3203         so = SCTP_INP_SO(stcb->sctp_ep);
3204         atomic_add_int(&stcb->asoc.refcnt, 1);
3205         SCTP_TCB_UNLOCK(stcb);
3206         SCTP_SOCKET_LOCK(so, 1);
3207         SCTP_TCB_LOCK(stcb);
3208         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3209 #endif
3210         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3211             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3212 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3213         SCTP_SOCKET_UNLOCK(so, 1);
3214 #endif
3215         return;
3216 }
3217
3218 static int
3219 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3220     struct sctp_nets *net, uint8_t flg)
3221 {
3222         switch (desc->chunk_type) {
3223         case SCTP_DATA:
3224                 /* find the tsn to resend (possibly */
3225                 {
3226                         uint32_t tsn;
3227                         struct sctp_tmit_chunk *tp1;
3228
3229                         tsn = ntohl(desc->tsn_ifany);
3230                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3231                                 if (tp1->rec.data.TSN_seq == tsn) {
3232                                         /* found it */
3233                                         break;
3234                                 }
3235                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3236                                         /* not found */
3237                                         tp1 = NULL;
3238                                         break;
3239                                 }
3240                         }
3241                         if (tp1 == NULL) {
3242                                 /*
3243                                  * Do it the other way , aka without paying
3244                                  * attention to queue seq order.
3245                                  */
3246                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3247                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3248                                         if (tp1->rec.data.TSN_seq == tsn) {
3249                                                 /* found it */
3250                                                 break;
3251                                         }
3252                                 }
3253                         }
3254                         if (tp1 == NULL) {
3255                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3256                         }
3257                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3258                                 uint8_t *ddp;
3259
3260                                 if (((flg & SCTP_BADCRC) == 0) &&
3261                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3262                                         return (0);
3263                                 }
3264                                 if ((stcb->asoc.peers_rwnd == 0) &&
3265                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3266                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3267                                         return (0);
3268                                 }
3269                                 if (stcb->asoc.peers_rwnd == 0 &&
3270                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3271                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3272                                         return (0);
3273                                 }
3274                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3275                                     sizeof(struct sctp_data_chunk));
3276                                 {
3277                                         unsigned int iii;
3278
3279                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3280                                             iii++) {
3281                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3282                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3283                                                         return (-1);
3284                                                 }
3285                                         }
3286                                 }
3287
3288                                 if (tp1->do_rtt) {
3289                                         /*
3290                                          * this guy had a RTO calculation
3291                                          * pending on it, cancel it
3292                                          */
3293                                         if (tp1->whoTo->rto_needed == 0) {
3294                                                 tp1->whoTo->rto_needed = 1;
3295                                         }
3296                                         tp1->do_rtt = 0;
3297                                 }
3298                                 SCTP_STAT_INCR(sctps_pdrpmark);
3299                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3300                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3301                                 /*
3302                                  * mark it as if we were doing a FR, since
3303                                  * we will be getting gap ack reports behind
3304                                  * the info from the router.
3305                                  */
3306                                 tp1->rec.data.doing_fast_retransmit = 1;
3307                                 /*
3308                                  * mark the tsn with what sequences can
3309                                  * cause a new FR.
3310                                  */
3311                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3312                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3313                                 } else {
3314                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3315                                 }
3316
3317                                 /* restart the timer */
3318                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3319                                     stcb, tp1->whoTo,
3320                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3321                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3322                                     stcb, tp1->whoTo);
3323
3324                                 /* fix counts and things */
3325                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3326                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3327                                             tp1->whoTo->flight_size,
3328                                             tp1->book_size,
3329                                             (uintptr_t) stcb,
3330                                             tp1->rec.data.TSN_seq);
3331                                 }
3332                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3333                                         sctp_flight_size_decrease(tp1);
3334                                         sctp_total_flight_decrease(stcb, tp1);
3335                                 }
3336                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3337                         } {
3338                                 /* audit code */
3339                                 unsigned int audit;
3340
3341                                 audit = 0;
3342                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3343                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3344                                                 audit++;
3345                                 }
3346                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3347                                     sctp_next) {
3348                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3349                                                 audit++;
3350                                 }
3351                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3352                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3353                                             audit, stcb->asoc.sent_queue_retran_cnt);
3354 #ifndef SCTP_AUDITING_ENABLED
3355                                         stcb->asoc.sent_queue_retran_cnt = audit;
3356 #endif
3357                                 }
3358                         }
3359                 }
3360                 break;
3361         case SCTP_ASCONF:
3362                 {
3363                         struct sctp_tmit_chunk *asconf;
3364
3365                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3366                             sctp_next) {
3367                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3368                                         break;
3369                                 }
3370                         }
3371                         if (asconf) {
3372                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3373                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3374                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3375                                 asconf->snd_count--;
3376                         }
3377                 }
3378                 break;
3379         case SCTP_INITIATION:
3380                 /* resend the INIT */
3381                 stcb->asoc.dropped_special_cnt++;
3382                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3383                         /*
3384                          * If we can get it in, in a few attempts we do
3385                          * this, otherwise we let the timer fire.
3386                          */
3387                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3388                             stcb, net,
3389                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3390                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3391                 }
3392                 break;
3393         case SCTP_SELECTIVE_ACK:
3394         case SCTP_NR_SELECTIVE_ACK:
3395                 /* resend the sack */
3396                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3397                 break;
3398         case SCTP_HEARTBEAT_REQUEST:
3399                 /* resend a demand HB */
3400                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3401                         /*
3402                          * Only retransmit if we KNOW we wont destroy the
3403                          * tcb
3404                          */
3405                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3406                 }
3407                 break;
3408         case SCTP_SHUTDOWN:
3409                 sctp_send_shutdown(stcb, net);
3410                 break;
3411         case SCTP_SHUTDOWN_ACK:
3412                 sctp_send_shutdown_ack(stcb, net);
3413                 break;
3414         case SCTP_COOKIE_ECHO:
3415                 {
3416                         struct sctp_tmit_chunk *cookie;
3417
3418                         cookie = NULL;
3419                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3420                             sctp_next) {
3421                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3422                                         break;
3423                                 }
3424                         }
3425                         if (cookie) {
3426                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3427                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3428                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3429                                 sctp_stop_all_cookie_timers(stcb);
3430                         }
3431                 }
3432                 break;
3433         case SCTP_COOKIE_ACK:
3434                 sctp_send_cookie_ack(stcb);
3435                 break;
3436         case SCTP_ASCONF_ACK:
3437                 /* resend last asconf ack */
3438                 sctp_send_asconf_ack(stcb);
3439                 break;
3440         case SCTP_FORWARD_CUM_TSN:
3441                 send_forward_tsn(stcb, &stcb->asoc);
3442                 break;
3443                 /* can't do anything with these */
3444         case SCTP_PACKET_DROPPED:
3445         case SCTP_INITIATION_ACK:       /* this should not happen */
3446         case SCTP_HEARTBEAT_ACK:
3447         case SCTP_ABORT_ASSOCIATION:
3448         case SCTP_OPERATION_ERROR:
3449         case SCTP_SHUTDOWN_COMPLETE:
3450         case SCTP_ECN_ECHO:
3451         case SCTP_ECN_CWR:
3452         default:
3453                 break;
3454         }
3455         return (0);
3456 }
3457
3458 void
3459 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3460 {
3461         uint32_t i;
3462         uint16_t temp;
3463
3464         /*
3465          * We set things to 0xffff since this is the last delivered sequence
3466          * and we will be sending in 0 after the reset.
3467          */
3468
3469         if (number_entries) {
3470                 for (i = 0; i < number_entries; i++) {
3471                         temp = ntohs(list[i]);
3472                         if (temp >= stcb->asoc.streamincnt) {
3473                                 continue;
3474                         }
3475                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3476                 }
3477         } else {
3478                 list = NULL;
3479                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3480                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3481                 }
3482         }
3483         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3484 }
3485
3486 static void
3487 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3488 {
3489         uint32_t i;
3490         uint16_t temp;
3491
3492         if (number_entries > 0) {
3493                 for (i = 0; i < number_entries; i++) {
3494                         temp = ntohs(list[i]);
3495                         if (temp >= stcb->asoc.streamoutcnt) {
3496                                 /* no such stream */
3497                                 continue;
3498                         }
3499                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3500                 }
3501         } else {
3502                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3503                         stcb->asoc.strmout[i].next_sequence_send = 0;
3504                 }
3505         }
3506         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3507 }
3508
3509
3510 struct sctp_stream_reset_request *
3511 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3512 {
3513         struct sctp_association *asoc;
3514         struct sctp_chunkhdr *ch;
3515         struct sctp_stream_reset_request *r;
3516         struct sctp_tmit_chunk *chk;
3517         int len, clen;
3518
3519         asoc = &stcb->asoc;
3520         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3521                 asoc->stream_reset_outstanding = 0;
3522                 return (NULL);
3523         }
3524         if (stcb->asoc.str_reset == NULL) {
3525                 asoc->stream_reset_outstanding = 0;
3526                 return (NULL);
3527         }
3528         chk = stcb->asoc.str_reset;
3529         if (chk->data == NULL) {
3530                 return (NULL);
3531         }
3532         if (bchk) {
3533                 /* he wants a copy of the chk pointer */
3534                 *bchk = chk;
3535         }
3536         clen = chk->send_size;
3537         ch = mtod(chk->data, struct sctp_chunkhdr *);
3538         r = (struct sctp_stream_reset_request *)(ch + 1);
3539         if (ntohl(r->request_seq) == seq) {
3540                 /* found it */
3541                 return (r);
3542         }
3543         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3544         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3545                 /* move to the next one, there can only be a max of two */
3546                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3547                 if (ntohl(r->request_seq) == seq) {
3548                         return (r);
3549                 }
3550         }
3551         /* that seq is not here */
3552         return (NULL);
3553 }
3554
3555 static void
3556 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3557 {
3558         struct sctp_association *asoc;
3559         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3560
3561         if (stcb->asoc.str_reset == NULL) {
3562                 return;
3563         }
3564         asoc = &stcb->asoc;
3565
3566         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3567             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3568         TAILQ_REMOVE(&asoc->control_send_queue,
3569             chk,
3570             sctp_next);
3571         if (chk->data) {
3572                 sctp_m_freem(chk->data);
3573                 chk->data = NULL;
3574         }
3575         asoc->ctrl_queue_cnt--;
3576         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3577         /* sa_ignore NO_NULL_CHK */
3578         stcb->asoc.str_reset = NULL;
3579 }
3580
3581
3582 static int
3583 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3584     uint32_t seq, uint32_t action,
3585     struct sctp_stream_reset_response *respin)
3586 {
3587         uint16_t type;
3588         int lparm_len;
3589         struct sctp_association *asoc = &stcb->asoc;
3590         struct sctp_tmit_chunk *chk;
3591         struct sctp_stream_reset_request *req_param;
3592         struct sctp_stream_reset_out_request *req_out_param;
3593         struct sctp_stream_reset_in_request *req_in_param;
3594         uint32_t number_entries;
3595
3596         if (asoc->stream_reset_outstanding == 0) {
3597                 /* duplicate */
3598                 return (0);
3599         }
3600         if (seq == stcb->asoc.str_reset_seq_out) {
3601                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3602                 if (req_param != NULL) {
3603                         stcb->asoc.str_reset_seq_out++;
3604                         type = ntohs(req_param->ph.param_type);
3605                         lparm_len = ntohs(req_param->ph.param_length);
3606                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3607                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3608                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3609                                 asoc->stream_reset_out_is_outstanding = 0;
3610                                 if (asoc->stream_reset_outstanding)
3611                                         asoc->stream_reset_outstanding--;
3612                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3613                                         /* do it */
3614                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3615                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3616                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3617                                 } else {
3618                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3619                                 }
3620                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3621                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3622                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3623                                 if (asoc->stream_reset_outstanding)
3624                                         asoc->stream_reset_outstanding--;
3625                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3626                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3627                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3628                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3629                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3630                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3631                                 }
3632                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3633                                 /* Ok we now may have more streams */
3634                                 int num_stream;
3635
3636                                 num_stream = stcb->asoc.strm_pending_add_size;
3637                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3638                                         /* TSNH */
3639                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3640                                 }
3641                                 stcb->asoc.strm_pending_add_size = 0;
3642                                 if (asoc->stream_reset_outstanding)
3643                                         asoc->stream_reset_outstanding--;
3644                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3645                                         /* Put the new streams into effect */
3646                                         stcb->asoc.streamoutcnt += num_stream;
3647                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3648                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3649                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3650                                             SCTP_STREAM_CHANGE_DENIED);
3651                                 } else {
3652                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3653                                             SCTP_STREAM_CHANGE_FAILED);
3654                                 }
3655                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3656                                 if (asoc->stream_reset_outstanding)
3657                                         asoc->stream_reset_outstanding--;
3658                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3659                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3660                                             SCTP_STREAM_CHANGE_DENIED);
3661                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3662                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3663                                             SCTP_STREAM_CHANGE_FAILED);
3664                                 }
3665                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3666                                 /**
3667                                  * a) Adopt the new in tsn.
3668                                  * b) reset the map
3669                                  * c) Adopt the new out-tsn
3670                                  */
3671                                 struct sctp_stream_reset_response_tsn *resp;
3672                                 struct sctp_forward_tsn_chunk fwdtsn;
3673                                 int abort_flag = 0;
3674
3675                                 if (respin == NULL) {
3676                                         /* huh ? */
3677                                         return (0);
3678                                 }
3679                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3680                                         return (0);
3681                                 }
3682                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3683                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3684                                         asoc->stream_reset_outstanding--;
3685                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3686                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3687                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3688                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3689                                         if (abort_flag) {
3690                                                 return (1);
3691                                         }
3692                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3693                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3694                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3695                                         }
3696                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3697                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3698                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3699
3700                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3701                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3702
3703                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3704                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3705
3706                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3707                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3708                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3709                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3710                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3711                                             SCTP_ASSOC_RESET_DENIED);
3712                                 } else {
3713                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3714                                             SCTP_ASSOC_RESET_FAILED);
3715                                 }
3716                         }
3717                         /* get rid of the request and get the request flags */
3718                         if (asoc->stream_reset_outstanding == 0) {
3719                                 sctp_clean_up_stream_reset(stcb);
3720                         }
3721                 }
3722         }
3723         return (0);
3724 }
3725
3726 static void
3727 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3728     struct sctp_tmit_chunk *chk,
3729     struct sctp_stream_reset_in_request *req, int trunc)
3730 {
3731         uint32_t seq;
3732         int len, i;
3733         int number_entries;
3734         uint16_t temp;
3735
3736         /*
3737          * peer wants me to send a str-reset to him for my outgoing seq's if
3738          * seq_in is right.
3739          */
3740         struct sctp_association *asoc = &stcb->asoc;
3741
3742         seq = ntohl(req->request_seq);
3743         if (asoc->str_reset_seq_in == seq) {
3744                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3745                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3746                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3747                 } else if (trunc) {
3748                         /* Can't do it, since they exceeded our buffer size  */
3749                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3750                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3751                         len = ntohs(req->ph.param_length);
3752                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3753                         for (i = 0; i < number_entries; i++) {
3754                                 temp = ntohs(req->list_of_streams[i]);
3755                                 req->list_of_streams[i] = temp;
3756                         }
3757                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3758                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3759                             asoc->str_reset_seq_out,
3760                             seq, (asoc->sending_seq - 1));
3761                         asoc->stream_reset_out_is_outstanding = 1;
3762                         asoc->str_reset = chk;
3763                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3764                         stcb->asoc.stream_reset_outstanding++;
3765                 } else {
3766                         /* Can't do it, since we have sent one out */
3767                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3768                 }
3769                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3770                 asoc->str_reset_seq_in++;
3771         } else if (asoc->str_reset_seq_in - 1 == seq) {
3772                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3773         } else if (asoc->str_reset_seq_in - 2 == seq) {
3774                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3775         } else {
3776                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3777         }
3778 }
3779
3780 static int
3781 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3782     struct sctp_tmit_chunk *chk,
3783     struct sctp_stream_reset_tsn_request *req)
3784 {
3785         /* reset all in and out and update the tsn */
3786         /*
3787          * A) reset my str-seq's on in and out. B) Select a receive next,
3788          * and set cum-ack to it. Also process this selected number as a
3789          * fwd-tsn as well. C) set in the response my next sending seq.
3790          */
3791         struct sctp_forward_tsn_chunk fwdtsn;
3792         struct sctp_association *asoc = &stcb->asoc;
3793         int abort_flag = 0;
3794         uint32_t seq;
3795
3796         seq = ntohl(req->request_seq);
3797         if (asoc->str_reset_seq_in == seq) {
3798                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3799                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3800                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3801                 } else {
3802                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3803                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3804                         fwdtsn.ch.chunk_flags = 0;
3805                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3806                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3807                         if (abort_flag) {
3808                                 return (1);
3809                         }
3810                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3811                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3812                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3813                         }
3814                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3815                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3816                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3817                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3818                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3819                         atomic_add_int(&asoc->sending_seq, 1);
3820                         /* save off historical data for retrans */
3821                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3822                         asoc->last_sending_seq[0] = asoc->sending_seq;
3823                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3824                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3825                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3826                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3827                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3828                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3829                 }
3830                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3831                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3832                 asoc->str_reset_seq_in++;
3833         } else if (asoc->str_reset_seq_in - 1 == seq) {
3834                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3835                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3836         } else if (asoc->str_reset_seq_in - 2 == seq) {
3837                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3838                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3839         } else {
3840                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3841         }
3842         return (0);
3843 }
3844
3845 static void
3846 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3847     struct sctp_tmit_chunk *chk,
3848     struct sctp_stream_reset_out_request *req, int trunc)
3849 {
3850         uint32_t seq, tsn;
3851         int number_entries, len;
3852         struct sctp_association *asoc = &stcb->asoc;
3853
3854         seq = ntohl(req->request_seq);
3855
3856         /* now if its not a duplicate we process it */
3857         if (asoc->str_reset_seq_in == seq) {
3858                 len = ntohs(req->ph.param_length);
3859                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3860                 /*
3861                  * the sender is resetting, handle the list issue.. we must
3862                  * a) verify if we can do the reset, if so no problem b) If
3863                  * we can't do the reset we must copy the request. c) queue
3864                  * it, and setup the data in processor to trigger it off
3865                  * when needed and dequeue all the queued data.
3866                  */
3867                 tsn = ntohl(req->send_reset_at_tsn);
3868
3869                 /* move the reset action back one */
3870                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3871                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3872                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3873                 } else if (trunc) {
3874                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3875                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3876                         /* we can do it now */
3877                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3878                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3879                 } else {
3880                         /*
3881                          * we must queue it up and thus wait for the TSN's
3882                          * to arrive that are at or before tsn
3883                          */
3884                         struct sctp_stream_reset_list *liste;
3885                         int siz;
3886
3887                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3888                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3889                             siz, SCTP_M_STRESET);
3890                         if (liste == NULL) {
3891                                 /* gak out of memory */
3892                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3893                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3894                                 return;
3895                         }
3896                         liste->tsn = tsn;
3897                         liste->number_entries = number_entries;
3898                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3899                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3900                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3901                 }
3902                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3903                 asoc->str_reset_seq_in++;
3904         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3905                 /*
3906                  * one seq back, just echo back last action since my
3907                  * response was lost.
3908                  */
3909                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3910         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3911                 /*
3912                  * two seq back, just echo back last action since my
3913                  * response was lost.
3914                  */
3915                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3916         } else {
3917                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3918         }
3919 }
3920
3921 static void
3922 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3923     struct sctp_stream_reset_add_strm *str_add)
3924 {
3925         /*
3926          * Peer is requesting to add more streams. If its within our
3927          * max-streams we will allow it.
3928          */
3929         uint32_t num_stream, i;
3930         uint32_t seq;
3931         struct sctp_association *asoc = &stcb->asoc;
3932         struct sctp_queued_to_read *ctl, *nctl;
3933
3934         /* Get the number. */
3935         seq = ntohl(str_add->request_seq);
3936         num_stream = ntohs(str_add->number_of_streams);
3937         /* Now what would be the new total? */
3938         if (asoc->str_reset_seq_in == seq) {
3939                 num_stream += stcb->asoc.streamincnt;
3940                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3941                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3942                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3943                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3944                     (num_stream > 0xffff)) {
3945                         /* We must reject it they ask for to many */
3946         denied:
3947                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3948                 } else {
3949                         /* Ok, we can do that :-) */
3950                         struct sctp_stream_in *oldstrm;
3951
3952                         /* save off the old */
3953                         oldstrm = stcb->asoc.strmin;
3954                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3955                             (num_stream * sizeof(struct sctp_stream_in)),
3956                             SCTP_M_STRMI);
3957                         if (stcb->asoc.strmin == NULL) {
3958                                 stcb->asoc.strmin = oldstrm;
3959                                 goto denied;
3960                         }
3961                         /* copy off the old data */
3962                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3963                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3964                                 stcb->asoc.strmin[i].stream_no = i;
3965                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3966                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3967                                 /* now anything on those queues? */
3968                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3969                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3970                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3971                                 }
3972                         }
3973                         /* Init the new streams */
3974                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3975                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3976                                 stcb->asoc.strmin[i].stream_no = i;
3977                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3978                                 stcb->asoc.strmin[i].delivery_started = 0;
3979                         }
3980                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3981                         /* update the size */
3982                         stcb->asoc.streamincnt = num_stream;
3983                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3984                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3985                 }
3986                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3987                 asoc->str_reset_seq_in++;
3988         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3989                 /*
3990                  * one seq back, just echo back last action since my
3991                  * response was lost.
3992                  */
3993                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3994         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3995                 /*
3996                  * two seq back, just echo back last action since my
3997                  * response was lost.
3998                  */
3999                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4000         } else {
4001                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4002
4003         }
4004 }
4005
4006 static void
4007 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4008     struct sctp_stream_reset_add_strm *str_add)
4009 {
4010         /*
4011          * Peer is requesting to add more streams. If its within our
4012          * max-streams we will allow it.
4013          */
4014         uint16_t num_stream;
4015         uint32_t seq;
4016         struct sctp_association *asoc = &stcb->asoc;
4017
4018         /* Get the number. */
4019         seq = ntohl(str_add->request_seq);
4020         num_stream = ntohs(str_add->number_of_streams);
4021         /* Now what would be the new total? */
4022         if (asoc->str_reset_seq_in == seq) {
4023                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4024                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4025                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4026                 } else if (stcb->asoc.stream_reset_outstanding) {
4027                         /* We must reject it we have something pending */
4028                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4029                 } else {
4030                         /* Ok, we can do that :-) */
4031                         int mychk;
4032
4033                         mychk = stcb->asoc.streamoutcnt;
4034                         mychk += num_stream;
4035                         if (mychk < 0x10000) {
4036                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4037                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4038                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4039                                 }
4040                         } else {
4041                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4042                         }
4043                 }
4044                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4045                 asoc->str_reset_seq_in++;
4046         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4047                 /*
4048                  * one seq back, just echo back last action since my
4049                  * response was lost.
4050                  */
4051                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4052         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4053                 /*
4054                  * two seq back, just echo back last action since my
4055                  * response was lost.
4056                  */
4057                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4058         } else {
4059                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4060         }
4061 }
4062
4063 #ifdef __GNUC__
4064 __attribute__((noinline))
4065 #endif
4066         static int
4067             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4068         struct sctp_chunkhdr *ch_req)
4069 {
4070         uint16_t remaining_length, param_len, ptype;
4071         struct sctp_paramhdr pstore;
4072         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4073         uint32_t seq = 0;
4074         int num_req = 0;
4075         int trunc = 0;
4076         struct sctp_tmit_chunk *chk;
4077         struct sctp_chunkhdr *ch;
4078         struct sctp_paramhdr *ph;
4079         int ret_code = 0;
4080         int num_param = 0;
4081
4082         /* now it may be a reset or a reset-response */
4083         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4084
4085         /* setup for adding the response */
4086         sctp_alloc_a_chunk(stcb, chk);
4087         if (chk == NULL) {
4088                 return (ret_code);
4089         }
4090         chk->copy_by_ref = 0;
4091         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4092         chk->rec.chunk_id.can_take_data = 0;
4093         chk->flags = 0;
4094         chk->asoc = &stcb->asoc;
4095         chk->no_fr_allowed = 0;
4096         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4097         chk->book_size_scale = 0;
4098         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4099         if (chk->data == NULL) {
4100 strres_nochunk:
4101                 if (chk->data) {
4102                         sctp_m_freem(chk->data);
4103                         chk->data = NULL;
4104                 }
4105                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4106                 return (ret_code);
4107         }
4108         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4109
4110         /* setup chunk parameters */
4111         chk->sent = SCTP_DATAGRAM_UNSENT;
4112         chk->snd_count = 0;
4113         chk->whoTo = NULL;
4114
4115         ch = mtod(chk->data, struct sctp_chunkhdr *);
4116         ch->chunk_type = SCTP_STREAM_RESET;
4117         ch->chunk_flags = 0;
4118         ch->chunk_length = htons(chk->send_size);
4119         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4120         offset += sizeof(struct sctp_chunkhdr);
4121         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4122                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4123                 if (ph == NULL) {
4124                         /* TSNH */
4125                         break;
4126                 }
4127                 param_len = ntohs(ph->param_length);
4128                 if ((param_len > remaining_length) ||
4129                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4130                         /* bad parameter length */
4131                         break;
4132                 }
4133                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4134                     (uint8_t *) & cstore);
4135                 if (ph == NULL) {
4136                         /* TSNH */
4137                         break;
4138                 }
4139                 ptype = ntohs(ph->param_type);
4140                 num_param++;
4141                 if (param_len > sizeof(cstore)) {
4142                         trunc = 1;
4143                 } else {
4144                         trunc = 0;
4145                 }
4146                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4147                         /* hit the max of parameters already sorry.. */
4148                         break;
4149                 }
4150                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4151                         struct sctp_stream_reset_out_request *req_out;
4152
4153                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4154                                 break;
4155                         }
4156                         req_out = (struct sctp_stream_reset_out_request *)ph;
4157                         num_req++;
4158                         if (stcb->asoc.stream_reset_outstanding) {
4159                                 seq = ntohl(req_out->response_seq);
4160                                 if (seq == stcb->asoc.str_reset_seq_out) {
4161                                         /* implicit ack */
4162                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4163                                 }
4164                         }
4165                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4166                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4167                         struct sctp_stream_reset_add_strm *str_add;
4168
4169                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4170                                 break;
4171                         }
4172                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4173                         num_req++;
4174                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4175                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4176                         struct sctp_stream_reset_add_strm *str_add;
4177
4178                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4179                                 break;
4180                         }
4181                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4182                         num_req++;
4183                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4184                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4185                         struct sctp_stream_reset_in_request *req_in;
4186
4187                         num_req++;
4188                         req_in = (struct sctp_stream_reset_in_request *)ph;
4189                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4190                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4191                         struct sctp_stream_reset_tsn_request *req_tsn;
4192
4193                         num_req++;
4194                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4195                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4196                                 ret_code = 1;
4197                                 goto strres_nochunk;
4198                         }
4199                         /* no more */
4200                         break;
4201                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4202                         struct sctp_stream_reset_response *resp;
4203                         uint32_t result;
4204
4205                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4206                                 break;
4207                         }
4208                         resp = (struct sctp_stream_reset_response *)ph;
4209                         seq = ntohl(resp->response_seq);
4210                         result = ntohl(resp->result);
4211                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4212                                 ret_code = 1;
4213                                 goto strres_nochunk;
4214                         }
4215                 } else {
4216                         break;
4217                 }
4218                 offset += SCTP_SIZE32(param_len);
4219                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4220                         remaining_length -= SCTP_SIZE32(param_len);
4221                 } else {
4222                         remaining_length = 0;
4223                 }
4224         }
4225         if (num_req == 0) {
4226                 /* we have no response free the stuff */
4227                 goto strres_nochunk;
4228         }
4229         /* ok we have a chunk to link in */
4230         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4231             chk,
4232             sctp_next);
4233         stcb->asoc.ctrl_queue_cnt++;
4234         return (ret_code);
4235 }
4236
4237 /*
4238  * Handle a router or endpoints report of a packet loss, there are two ways
4239  * to handle this, either we get the whole packet and must disect it
4240  * ourselves (possibly with truncation and or corruption) or it is a summary
4241  * from a middle box that did the disectting for us.
4242  */
4243 static void
4244 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4245     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4246 {
4247         uint32_t bottle_bw, on_queue;
4248         uint16_t trunc_len;
4249         unsigned int chlen;
4250         unsigned int at;
4251         struct sctp_chunk_desc desc;
4252         struct sctp_chunkhdr *ch;
4253
4254         chlen = ntohs(cp->ch.chunk_length);
4255         chlen -= sizeof(struct sctp_pktdrop_chunk);
4256         /* XXX possible chlen underflow */
4257         if (chlen == 0) {
4258                 ch = NULL;
4259                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4260                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4261         } else {
4262                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4263                 chlen -= sizeof(struct sctphdr);
4264                 /* XXX possible chlen underflow */
4265                 memset(&desc, 0, sizeof(desc));
4266         }
4267         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4268         if (trunc_len > limit) {
4269                 trunc_len = limit;
4270         }
4271         /* now the chunks themselves */
4272         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4273                 desc.chunk_type = ch->chunk_type;
4274                 /* get amount we need to move */
4275                 at = ntohs(ch->chunk_length);
4276                 if (at < sizeof(struct sctp_chunkhdr)) {
4277                         /* corrupt chunk, maybe at the end? */
4278                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4279                         break;
4280                 }
4281                 if (trunc_len == 0) {
4282                         /* we are supposed to have all of it */
4283                         if (at > chlen) {
4284                                 /* corrupt skip it */
4285                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4286                                 break;
4287                         }
4288                 } else {
4289                         /* is there enough of it left ? */
4290                         if (desc.chunk_type == SCTP_DATA) {
4291                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4292                                     sizeof(desc.data_bytes))) {
4293                                         break;
4294                                 }
4295                         } else {
4296                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4297                                         break;
4298                                 }
4299                         }
4300                 }
4301                 if (desc.chunk_type == SCTP_DATA) {
4302                         /* can we get out the tsn? */
4303                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4304                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4305
4306                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4307                                 /* yep */
4308                                 struct sctp_data_chunk *dcp;
4309                                 uint8_t *ddp;
4310                                 unsigned int iii;
4311
4312                                 dcp = (struct sctp_data_chunk *)ch;
4313                                 ddp = (uint8_t *) (dcp + 1);
4314                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4315                                         desc.data_bytes[iii] = ddp[iii];
4316                                 }
4317                                 desc.tsn_ifany = dcp->dp.tsn;
4318                         } else {
4319                                 /* nope we are done. */
4320                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4321                                 break;
4322                         }
4323                 } else {
4324                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4325                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4326                 }
4327
4328                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4329                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4330                         break;
4331                 }
4332                 if (SCTP_SIZE32(at) > chlen) {
4333                         break;
4334                 }
4335                 chlen -= SCTP_SIZE32(at);
4336                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4337                         /* done, none left */
4338                         break;
4339                 }
4340                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4341         }
4342         /* Now update any rwnd --- possibly */
4343         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4344                 /* From a peer, we get a rwnd report */
4345                 uint32_t a_rwnd;
4346
4347                 SCTP_STAT_INCR(sctps_pdrpfehos);
4348
4349                 bottle_bw = ntohl(cp->bottle_bw);
4350                 on_queue = ntohl(cp->current_onq);
4351                 if (bottle_bw && on_queue) {
4352                         /* a rwnd report is in here */
4353                         if (bottle_bw > on_queue)
4354                                 a_rwnd = bottle_bw - on_queue;
4355                         else
4356                                 a_rwnd = 0;
4357
4358                         if (a_rwnd == 0)
4359                                 stcb->asoc.peers_rwnd = 0;
4360                         else {
4361                                 if (a_rwnd > stcb->asoc.total_flight) {
4362                                         stcb->asoc.peers_rwnd =
4363                                             a_rwnd - stcb->asoc.total_flight;
4364                                 } else {
4365                                         stcb->asoc.peers_rwnd = 0;
4366                                 }
4367                                 if (stcb->asoc.peers_rwnd <
4368                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4369                                         /* SWS sender side engages */
4370                                         stcb->asoc.peers_rwnd = 0;
4371                                 }
4372                         }
4373                 }
4374         } else {
4375                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4376         }
4377
4378         /* now middle boxes in sat networks get a cwnd bump */
4379         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4380             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4381             (stcb->asoc.sat_network)) {
4382                 /*
4383                  * This is debateable but for sat networks it makes sense
4384                  * Note if a T3 timer has went off, we will prohibit any
4385                  * changes to cwnd until we exit the t3 loss recovery.
4386                  */
4387                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4388                     net, cp, &bottle_bw, &on_queue);
4389         }
4390 }
4391
4392 /*
4393  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4394  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4395  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4396  * length of the complete packet outputs: - length: modified to remaining
4397  * length after control processing - netp: modified to new sctp_nets after
4398  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4399  * bad packet,...) otherwise return the tcb for this packet
4400  */
4401 #ifdef __GNUC__
4402 __attribute__((noinline))
4403 #endif
4404         static struct sctp_tcb *
4405                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4406              struct sockaddr *src, struct sockaddr *dst,
4407              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4408              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4409              uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4410              uint32_t vrf_id, uint16_t port)
4411 {
4412         struct sctp_association *asoc;
4413         struct mbuf *op_err;
4414         char msg[SCTP_DIAG_INFO_LEN];
4415         uint32_t vtag_in;
4416         int num_chunks = 0;     /* number of control chunks processed */
4417         uint32_t chk_length;
4418         int ret;
4419         int abort_no_unlock = 0;
4420         int ecne_seen = 0;
4421
4422         /*
4423          * How big should this be, and should it be alloc'd? Lets try the
4424          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4425          * until we get into jumbo grams and such..
4426          */
4427         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4428         struct sctp_tcb *locked_tcb = stcb;
4429         int got_auth = 0;
4430         uint32_t auth_offset = 0, auth_len = 0;
4431         int auth_skipped = 0;
4432         int asconf_cnt = 0;
4433
4434 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4435         struct socket *so;
4436
4437 #endif
4438
4439         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4440             iphlen, *offset, length, (void *)stcb);
4441
4442         /* validate chunk header length... */
4443         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4444                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4445                     ntohs(ch->chunk_length));
4446                 if (locked_tcb) {
4447                         SCTP_TCB_UNLOCK(locked_tcb);
4448                 }
4449                 return (NULL);
4450         }
4451         /*
4452          * validate the verification tag
4453          */
4454         vtag_in = ntohl(sh->v_tag);
4455
4456         if (locked_tcb) {
4457                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4458         }
4459         if (ch->chunk_type == SCTP_INITIATION) {
4460                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4461                     ntohs(ch->chunk_length), vtag_in);
4462                 if (vtag_in != 0) {
4463                         /* protocol error- silently discard... */
4464                         SCTP_STAT_INCR(sctps_badvtag);
4465                         if (locked_tcb) {
4466                                 SCTP_TCB_UNLOCK(locked_tcb);
4467                         }
4468                         return (NULL);
4469                 }
4470         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4471                 /*
4472                  * If there is no stcb, skip the AUTH chunk and process
4473                  * later after a stcb is found (to validate the lookup was
4474                  * valid.
4475                  */
4476                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4477                     (stcb == NULL) &&
4478                     (inp->auth_supported == 1)) {
4479                         /* save this chunk for later processing */
4480                         auth_skipped = 1;
4481                         auth_offset = *offset;
4482                         auth_len = ntohs(ch->chunk_length);
4483
4484                         /* (temporarily) move past this chunk */
4485                         *offset += SCTP_SIZE32(auth_len);
4486                         if (*offset >= length) {
4487                                 /* no more data left in the mbuf chain */
4488                                 *offset = length;
4489                                 if (locked_tcb) {
4490                                         SCTP_TCB_UNLOCK(locked_tcb);
4491                                 }
4492                                 return (NULL);
4493                         }
4494                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4495                             sizeof(struct sctp_chunkhdr), chunk_buf);
4496                 }
4497                 if (ch == NULL) {
4498                         /* Help */
4499                         *offset = length;
4500                         if (locked_tcb) {
4501                                 SCTP_TCB_UNLOCK(locked_tcb);
4502                         }
4503                         return (NULL);
4504                 }
4505                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4506                         goto process_control_chunks;
4507                 }
4508                 /*
4509                  * first check if it's an ASCONF with an unknown src addr we
4510                  * need to look inside to find the association
4511                  */
4512                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4513                         struct sctp_chunkhdr *asconf_ch = ch;
4514                         uint32_t asconf_offset = 0, asconf_len = 0;
4515
4516                         /* inp's refcount may be reduced */
4517                         SCTP_INP_INCR_REF(inp);
4518
4519                         asconf_offset = *offset;
4520                         do {
4521                                 asconf_len = ntohs(asconf_ch->chunk_length);
4522                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4523                                         break;
4524                                 stcb = sctp_findassociation_ep_asconf(m,
4525                                     *offset,
4526                                     dst,
4527                                     sh, &inp, netp, vrf_id);
4528                                 if (stcb != NULL)
4529                                         break;
4530                                 asconf_offset += SCTP_SIZE32(asconf_len);
4531                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4532                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4533                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4534                         if (stcb == NULL) {
4535                                 /*
4536                                  * reduce inp's refcount if not reduced in
4537                                  * sctp_findassociation_ep_asconf().
4538                                  */
4539                                 SCTP_INP_DECR_REF(inp);
4540                         } else {
4541                                 locked_tcb = stcb;
4542                         }
4543
4544                         /* now go back and verify any auth chunk to be sure */
4545                         if (auth_skipped && (stcb != NULL)) {
4546                                 struct sctp_auth_chunk *auth;
4547
4548                                 auth = (struct sctp_auth_chunk *)
4549                                     sctp_m_getptr(m, auth_offset,
4550                                     auth_len, chunk_buf);
4551                                 got_auth = 1;
4552                                 auth_skipped = 0;
4553                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4554                                     auth_offset)) {
4555                                         /* auth HMAC failed so dump it */
4556                                         *offset = length;
4557                                         if (locked_tcb) {
4558                                                 SCTP_TCB_UNLOCK(locked_tcb);
4559                                         }
4560                                         return (NULL);
4561                                 } else {
4562                                         /* remaining chunks are HMAC checked */
4563                                         stcb->asoc.authenticated = 1;
4564                                 }
4565                         }
4566                 }
4567                 if (stcb == NULL) {
4568                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4569                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4570                             msg);
4571                         /* no association, so it's out of the blue... */
4572                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4573                             mflowtype, mflowid, inp->fibnum,
4574                             vrf_id, port);
4575                         *offset = length;
4576                         if (locked_tcb) {
4577                                 SCTP_TCB_UNLOCK(locked_tcb);
4578                         }
4579                         return (NULL);
4580                 }
4581                 asoc = &stcb->asoc;
4582                 /* ABORT and SHUTDOWN can use either v_tag... */
4583                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4584                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4585                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4586                         /* Take the T-bit always into account. */
4587                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4588                             (vtag_in == asoc->my_vtag)) ||
4589                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4590                             (vtag_in == asoc->peer_vtag))) {
4591                                 /* this is valid */
4592                         } else {
4593                                 /* drop this packet... */
4594                                 SCTP_STAT_INCR(sctps_badvtag);
4595                                 if (locked_tcb) {
4596                                         SCTP_TCB_UNLOCK(locked_tcb);
4597                                 }
4598                                 return (NULL);
4599                         }
4600                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4601                         if (vtag_in != asoc->my_vtag) {
4602                                 /*
4603                                  * this could be a stale SHUTDOWN-ACK or the
4604                                  * peer never got the SHUTDOWN-COMPLETE and
4605                                  * is still hung; we have started a new asoc
4606                                  * but it won't complete until the shutdown
4607                                  * is completed
4608                                  */
4609                                 if (locked_tcb) {
4610                                         SCTP_TCB_UNLOCK(locked_tcb);
4611                                 }
4612                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4613                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4614                                     msg);
4615                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4616                                     sh, inp, op_err,
4617                                     mflowtype, mflowid, fibnum,
4618                                     vrf_id, port);
4619                                 return (NULL);
4620                         }
4621                 } else {
4622                         /* for all other chunks, vtag must match */
4623                         if (vtag_in != asoc->my_vtag) {
4624                                 /* invalid vtag... */
4625                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4626                                     "invalid vtag: %xh, expect %xh\n",
4627                                     vtag_in, asoc->my_vtag);
4628                                 SCTP_STAT_INCR(sctps_badvtag);
4629                                 if (locked_tcb) {
4630                                         SCTP_TCB_UNLOCK(locked_tcb);
4631                                 }
4632                                 *offset = length;
4633                                 return (NULL);
4634                         }
4635                 }
4636         }                       /* end if !SCTP_COOKIE_ECHO */
4637         /*
4638          * process all control chunks...
4639          */
4640         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4641             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4642             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4643             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4644                 /* implied cookie-ack.. we must have lost the ack */
4645                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4646                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4647                             stcb->asoc.overall_error_count,
4648                             0,
4649                             SCTP_FROM_SCTP_INPUT,
4650                             __LINE__);
4651                 }
4652                 stcb->asoc.overall_error_count = 0;
4653                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4654                     *netp);
4655         }
4656 process_control_chunks:
4657         while (IS_SCTP_CONTROL(ch)) {
4658                 /* validate chunk length */
4659                 chk_length = ntohs(ch->chunk_length);
4660                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4661                     ch->chunk_type, chk_length);
4662                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4663                 if (chk_length < sizeof(*ch) ||
4664                     (*offset + (int)chk_length) > length) {
4665                         *offset = length;
4666                         if (locked_tcb) {
4667                                 SCTP_TCB_UNLOCK(locked_tcb);
4668                         }
4669                         return (NULL);
4670                 }
4671                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4672                 /*
4673                  * INIT-ACK only gets the init ack "header" portion only
4674                  * because we don't have to process the peer's COOKIE. All
4675                  * others get a complete chunk.
4676                  */
4677                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4678                     (ch->chunk_type == SCTP_INITIATION)) {
4679                         /* get an init-ack chunk */
4680                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4681                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4682                         if (ch == NULL) {
4683                                 *offset = length;
4684                                 if (locked_tcb) {
4685                                         SCTP_TCB_UNLOCK(locked_tcb);
4686                                 }
4687                                 return (NULL);
4688                         }
4689                 } else {
4690                         /* For cookies and all other chunks. */
4691                         if (chk_length > sizeof(chunk_buf)) {
4692                                 /*
4693                                  * use just the size of the chunk buffer so
4694                                  * the front part of our chunks fit in
4695                                  * contiguous space up to the chunk buffer
4696                                  * size (508 bytes). For chunks that need to
4697                                  * get more than that they must use the
4698                                  * sctp_m_getptr() function or other means
4699                                  * (e.g. know how to parse mbuf chains).
4700                                  * Cookies do this already.
4701                                  */
4702                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4703                                     (sizeof(chunk_buf) - 4),
4704                                     chunk_buf);
4705                                 if (ch == NULL) {
4706                                         *offset = length;
4707                                         if (locked_tcb) {
4708                                                 SCTP_TCB_UNLOCK(locked_tcb);
4709                                         }
4710                                         return (NULL);
4711                                 }
4712                         } else {
4713                                 /* We can fit it all */
4714                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4715                                     chk_length, chunk_buf);
4716                                 if (ch == NULL) {
4717                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4718                                         *offset = length;
4719                                         if (locked_tcb) {
4720                                                 SCTP_TCB_UNLOCK(locked_tcb);
4721                                         }
4722                                         return (NULL);
4723                                 }
4724                         }
4725                 }
4726                 num_chunks++;
4727                 /* Save off the last place we got a control from */
4728                 if (stcb != NULL) {
4729                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4730                                 /*
4731                                  * allow last_control to be NULL if
4732                                  * ASCONF... ASCONF processing will find the
4733                                  * right net later
4734                                  */
4735                                 if ((netp != NULL) && (*netp != NULL))
4736                                         stcb->asoc.last_control_chunk_from = *netp;
4737                         }
4738                 }
4739 #ifdef SCTP_AUDITING_ENABLED
4740                 sctp_audit_log(0xB0, ch->chunk_type);
4741 #endif
4742
4743                 /* check to see if this chunk required auth, but isn't */
4744                 if ((stcb != NULL) &&
4745                     (stcb->asoc.auth_supported == 1) &&
4746                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4747                     !stcb->asoc.authenticated) {
4748                         /* "silently" ignore */
4749                         SCTP_STAT_INCR(sctps_recvauthmissing);
4750                         goto next_chunk;
4751                 }
4752                 switch (ch->chunk_type) {
4753                 case SCTP_INITIATION:
4754                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4755                         /* The INIT chunk must be the only chunk. */
4756                         if ((num_chunks > 1) ||
4757                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4758                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4759                                     "INIT not the only chunk");
4760                                 sctp_abort_association(inp, stcb, m, iphlen,
4761                                     src, dst, sh, op_err,
4762                                     mflowtype, mflowid,
4763                                     vrf_id, port);
4764                                 *offset = length;
4765                                 return (NULL);
4766                         }
4767                         /* Honor our resource limit. */
4768                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4769                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4770                                 sctp_abort_association(inp, stcb, m, iphlen,
4771                                     src, dst, sh, op_err,
4772                                     mflowtype, mflowid,
4773                                     vrf_id, port);
4774                                 *offset = length;
4775                                 return (NULL);
4776                         }
4777                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4778                             (struct sctp_init_chunk *)ch, inp,
4779                             stcb, &abort_no_unlock,
4780                             mflowtype, mflowid,
4781                             vrf_id, port);
4782                         *offset = length;
4783                         if ((!abort_no_unlock) && (locked_tcb)) {
4784                                 SCTP_TCB_UNLOCK(locked_tcb);
4785                         }
4786                         return (NULL);
4787                         break;
4788                 case SCTP_PAD_CHUNK:
4789                         break;
4790                 case SCTP_INITIATION_ACK:
4791                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4792                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4793                                 /* We are not interested anymore */
4794                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4795                                         ;
4796                                 } else {
4797                                         if (locked_tcb != stcb) {
4798                                                 /* Very unlikely */
4799                                                 SCTP_TCB_UNLOCK(locked_tcb);
4800                                         }
4801                                         *offset = length;
4802                                         if (stcb) {
4803 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4804                                                 so = SCTP_INP_SO(inp);
4805                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4806                                                 SCTP_TCB_UNLOCK(stcb);
4807                                                 SCTP_SOCKET_LOCK(so, 1);
4808                                                 SCTP_TCB_LOCK(stcb);
4809                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4810 #endif
4811                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4812                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4813 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4814                                                 SCTP_SOCKET_UNLOCK(so, 1);
4815 #endif
4816                                         }
4817                                         return (NULL);
4818                                 }
4819                         }
4820                         /* The INIT-ACK chunk must be the only chunk. */
4821                         if ((num_chunks > 1) ||
4822                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4823                                 *offset = length;
4824                                 if (locked_tcb) {
4825                                         SCTP_TCB_UNLOCK(locked_tcb);
4826                                 }
4827                                 return (NULL);
4828                         }
4829                         if ((netp) && (*netp)) {
4830                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4831                                     src, dst, sh,
4832                                     (struct sctp_init_ack_chunk *)ch,
4833                                     stcb, *netp,
4834                                     &abort_no_unlock,
4835                                     mflowtype, mflowid,
4836                                     vrf_id);
4837                         } else {
4838                                 ret = -1;
4839                         }
4840                         *offset = length;
4841                         if (abort_no_unlock) {
4842                                 return (NULL);
4843                         }
4844                         /*
4845                          * Special case, I must call the output routine to
4846                          * get the cookie echoed
4847                          */
4848                         if ((stcb != NULL) && (ret == 0)) {
4849                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4850                         }
4851                         if (locked_tcb) {
4852                                 SCTP_TCB_UNLOCK(locked_tcb);
4853                         }
4854                         return (NULL);
4855                         break;
4856                 case SCTP_SELECTIVE_ACK:
4857                         {
4858                                 struct sctp_sack_chunk *sack;
4859                                 int abort_now = 0;
4860                                 uint32_t a_rwnd, cum_ack;
4861                                 uint16_t num_seg, num_dup;
4862                                 uint8_t flags;
4863                                 int offset_seg, offset_dup;
4864
4865                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4866                                 SCTP_STAT_INCR(sctps_recvsacks);
4867                                 if (stcb == NULL) {
4868                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4869                                         break;
4870                                 }
4871                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4872                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4873                                         break;
4874                                 }
4875                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4876                                         /*-
4877                                          * If we have sent a shutdown-ack, we will pay no
4878                                          * attention to a sack sent in to us since
4879                                          * we don't care anymore.
4880                                          */
4881                                         break;
4882                                 }
4883                                 sack = (struct sctp_sack_chunk *)ch;
4884                                 flags = ch->chunk_flags;
4885                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4886                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4887                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4888                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4889                                 if (sizeof(struct sctp_sack_chunk) +
4890                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4891                                     num_dup * sizeof(uint32_t) != chk_length) {
4892                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4893                                         break;
4894                                 }
4895                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4896                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4897                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4898                                     cum_ack, num_seg, a_rwnd);
4899                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4900                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4901                                     (num_seg == 0) &&
4902                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4903                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4904                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4905                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4906                                     ) {
4907                                         /*
4908                                          * We have a SIMPLE sack having no
4909                                          * prior segments and data on sent
4910                                          * queue to be acked.. Use the
4911                                          * faster path sack processing. We
4912                                          * also allow window update sacks
4913                                          * with no missing segments to go
4914                                          * this way too.
4915                                          */
4916                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4917                                 } else {
4918                                         if (netp && *netp)
4919                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4920                                                     num_seg, 0, num_dup, &abort_now, flags,
4921                                                     cum_ack, a_rwnd, ecne_seen);
4922                                 }
4923                                 if (abort_now) {
4924                                         /* ABORT signal from sack processing */
4925                                         *offset = length;
4926                                         return (NULL);
4927                                 }
4928                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4929                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4930                                     (stcb->asoc.stream_queue_cnt == 0)) {
4931                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4932                                 }
4933                         }
4934                         break;
4935                         /*
4936                          * EY - nr_sack:  If the received chunk is an
4937                          * nr_sack chunk
4938                          */
4939                 case SCTP_NR_SELECTIVE_ACK:
4940                         {
4941                                 struct sctp_nr_sack_chunk *nr_sack;
4942                                 int abort_now = 0;
4943                                 uint32_t a_rwnd, cum_ack;
4944                                 uint16_t num_seg, num_nr_seg, num_dup;
4945                                 uint8_t flags;
4946                                 int offset_seg, offset_dup;
4947
4948                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4949                                 SCTP_STAT_INCR(sctps_recvsacks);
4950                                 if (stcb == NULL) {
4951                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4952                                         break;
4953                                 }
4954                                 if (stcb->asoc.nrsack_supported == 0) {
4955                                         goto unknown_chunk;
4956                                 }
4957                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4958                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4959                                         break;
4960                                 }
4961                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4962                                         /*-
4963                                          * If we have sent a shutdown-ack, we will pay no
4964                                          * attention to a sack sent in to us since
4965                                          * we don't care anymore.
4966                                          */
4967                                         break;
4968                                 }
4969                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4970                                 flags = ch->chunk_flags;
4971                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4972                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4973                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4974                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4975                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4976                                 if (sizeof(struct sctp_nr_sack_chunk) +
4977                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4978                                     num_dup * sizeof(uint32_t) != chk_length) {
4979                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4980                                         break;
4981                                 }
4982                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4983                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4984                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4985                                     cum_ack, num_seg, a_rwnd);
4986                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4987                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4988                                     (num_seg == 0) && (num_nr_seg == 0) &&
4989                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4990                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4991                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4992                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4993                                         /*
4994                                          * We have a SIMPLE sack having no
4995                                          * prior segments and data on sent
4996                                          * queue to be acked. Use the faster
4997                                          * path sack processing. We also
4998                                          * allow window update sacks with no
4999                                          * missing segments to go this way
5000                                          * too.
5001                                          */
5002                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5003                                             &abort_now, ecne_seen);
5004                                 } else {
5005                                         if (netp && *netp)
5006                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5007                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5008                                                     cum_ack, a_rwnd, ecne_seen);
5009                                 }
5010                                 if (abort_now) {
5011                                         /* ABORT signal from sack processing */
5012                                         *offset = length;
5013                                         return (NULL);
5014                                 }
5015                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5016                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5017                                     (stcb->asoc.stream_queue_cnt == 0)) {
5018                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5019                                 }
5020                         }
5021                         break;
5022
5023                 case SCTP_HEARTBEAT_REQUEST:
5024                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5025                         if ((stcb) && netp && *netp) {
5026                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5027                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5028                                     chk_length, *netp);
5029
5030                                 /* He's alive so give him credit */
5031                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5032                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5033                                             stcb->asoc.overall_error_count,
5034                                             0,
5035                                             SCTP_FROM_SCTP_INPUT,
5036                                             __LINE__);
5037                                 }
5038                                 stcb->asoc.overall_error_count = 0;
5039                         }
5040                         break;
5041                 case SCTP_HEARTBEAT_ACK:
5042                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5043                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5044                                 /* Its not ours */
5045                                 *offset = length;
5046                                 if (locked_tcb) {
5047                                         SCTP_TCB_UNLOCK(locked_tcb);
5048                                 }
5049                                 return (NULL);
5050                         }
5051                         /* He's alive so give him credit */
5052                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5053                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5054                                     stcb->asoc.overall_error_count,
5055                                     0,
5056                                     SCTP_FROM_SCTP_INPUT,
5057                                     __LINE__);
5058                         }
5059                         stcb->asoc.overall_error_count = 0;
5060                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5061                         if (netp && *netp)
5062                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5063                                     stcb, *netp);
5064                         break;
5065                 case SCTP_ABORT_ASSOCIATION:
5066                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5067                             (void *)stcb);
5068                         if ((stcb) && netp && *netp)
5069                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5070                                     stcb, *netp);
5071                         *offset = length;
5072                         return (NULL);
5073                         break;
5074                 case SCTP_SHUTDOWN:
5075                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5076                             (void *)stcb);
5077                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5078                                 *offset = length;
5079                                 if (locked_tcb) {
5080                                         SCTP_TCB_UNLOCK(locked_tcb);
5081                                 }
5082                                 return (NULL);
5083                         }
5084                         if (netp && *netp) {
5085                                 int abort_flag = 0;
5086
5087                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5088                                     stcb, *netp, &abort_flag);
5089                                 if (abort_flag) {
5090                                         *offset = length;
5091                                         return (NULL);
5092                                 }
5093                         }
5094                         break;
5095                 case SCTP_SHUTDOWN_ACK:
5096                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5097                         if ((stcb) && (netp) && (*netp))
5098                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5099                         *offset = length;
5100                         return (NULL);
5101                         break;
5102
5103                 case SCTP_OPERATION_ERROR:
5104                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5105                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5106                                 *offset = length;
5107                                 return (NULL);
5108                         }
5109                         break;
5110                 case SCTP_COOKIE_ECHO:
5111                         SCTPDBG(SCTP_DEBUG_INPUT3,
5112                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5113                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5114                                 ;
5115                         } else {
5116                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5117                                         /* We are not interested anymore */
5118                         abend:
5119                                         if (stcb) {
5120                                                 SCTP_TCB_UNLOCK(stcb);
5121                                         }
5122                                         *offset = length;
5123                                         return (NULL);
5124                                 }
5125                         }
5126                         /*
5127                          * First are we accepting? We do this again here
5128                          * since it is possible that a previous endpoint WAS
5129                          * listening responded to a INIT-ACK and then
5130                          * closed. We opened and bound.. and are now no
5131                          * longer listening.
5132                          */
5133
5134                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5135                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5136                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5137                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5138                                         sctp_abort_association(inp, stcb, m, iphlen,
5139                                             src, dst, sh, op_err,
5140                                             mflowtype, mflowid,
5141                                             vrf_id, port);
5142                                 }
5143                                 *offset = length;
5144                                 return (NULL);
5145                         } else {
5146                                 struct mbuf *ret_buf;
5147                                 struct sctp_inpcb *linp;
5148
5149                                 if (stcb) {
5150                                         linp = NULL;
5151                                 } else {
5152                                         linp = inp;
5153                                 }
5154
5155                                 if (linp) {
5156                                         SCTP_ASOC_CREATE_LOCK(linp);
5157                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5158                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5159                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5160                                                 goto abend;
5161                                         }
5162                                 }
5163                                 if (netp) {
5164                                         ret_buf =
5165                                             sctp_handle_cookie_echo(m, iphlen,
5166                                             *offset,
5167                                             src, dst,
5168                                             sh,
5169                                             (struct sctp_cookie_echo_chunk *)ch,
5170                                             &inp, &stcb, netp,
5171                                             auth_skipped,
5172                                             auth_offset,
5173                                             auth_len,
5174                                             &locked_tcb,
5175                                             mflowtype,
5176                                             mflowid,
5177                                             vrf_id,
5178                                             port);
5179                                 } else {
5180                                         ret_buf = NULL;
5181                                 }
5182                                 if (linp) {
5183                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5184                                 }
5185                                 if (ret_buf == NULL) {
5186                                         if (locked_tcb) {
5187                                                 SCTP_TCB_UNLOCK(locked_tcb);
5188                                         }
5189                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5190                                             "GAK, null buffer\n");
5191                                         *offset = length;
5192                                         return (NULL);
5193                                 }
5194                                 /* if AUTH skipped, see if it verified... */
5195                                 if (auth_skipped) {
5196                                         got_auth = 1;
5197                                         auth_skipped = 0;
5198                                 }
5199                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5200                                         /*
5201                                          * Restart the timer if we have
5202                                          * pending data
5203                                          */
5204                                         struct sctp_tmit_chunk *chk;
5205
5206                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5207                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5208                                 }
5209                         }
5210                         break;
5211                 case SCTP_COOKIE_ACK:
5212                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5213                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5214                                 if (locked_tcb) {
5215                                         SCTP_TCB_UNLOCK(locked_tcb);
5216                                 }
5217                                 return (NULL);
5218                         }
5219                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5220                                 /* We are not interested anymore */
5221                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5222                                         ;
5223                                 } else if (stcb) {
5224 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5225                                         so = SCTP_INP_SO(inp);
5226                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5227                                         SCTP_TCB_UNLOCK(stcb);
5228                                         SCTP_SOCKET_LOCK(so, 1);
5229                                         SCTP_TCB_LOCK(stcb);
5230                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5231 #endif
5232                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5233                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5234 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5235                                         SCTP_SOCKET_UNLOCK(so, 1);
5236 #endif
5237                                         *offset = length;
5238                                         return (NULL);
5239                                 }
5240                         }
5241                         /* He's alive so give him credit */
5242                         if ((stcb) && netp && *netp) {
5243                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5244                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5245                                             stcb->asoc.overall_error_count,
5246                                             0,
5247                                             SCTP_FROM_SCTP_INPUT,
5248                                             __LINE__);
5249                                 }
5250                                 stcb->asoc.overall_error_count = 0;
5251                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5252                         }
5253                         break;
5254                 case SCTP_ECN_ECHO:
5255                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5256                         /* He's alive so give him credit */
5257                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5258                                 /* Its not ours */
5259                                 if (locked_tcb) {
5260                                         SCTP_TCB_UNLOCK(locked_tcb);
5261                                 }
5262                                 *offset = length;
5263                                 return (NULL);
5264                         }
5265                         if (stcb) {
5266                                 if (stcb->asoc.ecn_supported == 0) {
5267                                         goto unknown_chunk;
5268                                 }
5269                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5270                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5271                                             stcb->asoc.overall_error_count,
5272                                             0,
5273                                             SCTP_FROM_SCTP_INPUT,
5274                                             __LINE__);
5275                                 }
5276                                 stcb->asoc.overall_error_count = 0;
5277                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5278                                     stcb);
5279                                 ecne_seen = 1;
5280                         }
5281                         break;
5282                 case SCTP_ECN_CWR:
5283                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5284                         /* He's alive so give him credit */
5285                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5286                                 /* Its not ours */
5287                                 if (locked_tcb) {
5288                                         SCTP_TCB_UNLOCK(locked_tcb);
5289                                 }
5290                                 *offset = length;
5291                                 return (NULL);
5292                         }
5293                         if (stcb) {
5294                                 if (stcb->asoc.ecn_supported == 0) {
5295                                         goto unknown_chunk;
5296                                 }
5297                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5298                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5299                                             stcb->asoc.overall_error_count,
5300                                             0,
5301                                             SCTP_FROM_SCTP_INPUT,
5302                                             __LINE__);
5303                                 }
5304                                 stcb->asoc.overall_error_count = 0;
5305                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5306                         }
5307                         break;
5308                 case SCTP_SHUTDOWN_COMPLETE:
5309                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5310                         /* must be first and only chunk */
5311                         if ((num_chunks > 1) ||
5312                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5313                                 *offset = length;
5314                                 if (locked_tcb) {
5315                                         SCTP_TCB_UNLOCK(locked_tcb);
5316                                 }
5317                                 return (NULL);
5318                         }
5319                         if ((stcb) && netp && *netp) {
5320                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5321                                     stcb, *netp);
5322                         }
5323                         *offset = length;
5324                         return (NULL);
5325                         break;
5326                 case SCTP_ASCONF:
5327                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5328                         /* He's alive so give him credit */
5329                         if (stcb) {
5330                                 if (stcb->asoc.asconf_supported == 0) {
5331                                         goto unknown_chunk;
5332                                 }
5333                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5334                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5335                                             stcb->asoc.overall_error_count,
5336                                             0,
5337                                             SCTP_FROM_SCTP_INPUT,
5338                                             __LINE__);
5339                                 }
5340                                 stcb->asoc.overall_error_count = 0;
5341                                 sctp_handle_asconf(m, *offset, src,
5342                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5343                                 asconf_cnt++;
5344                         }
5345                         break;
5346                 case SCTP_ASCONF_ACK:
5347                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5348                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5349                                 /* Its not ours */
5350                                 if (locked_tcb) {
5351                                         SCTP_TCB_UNLOCK(locked_tcb);
5352                                 }
5353                                 *offset = length;
5354                                 return (NULL);
5355                         }
5356                         if ((stcb) && netp && *netp) {
5357                                 if (stcb->asoc.asconf_supported == 0) {
5358                                         goto unknown_chunk;
5359                                 }
5360                                 /* He's alive so give him credit */
5361                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5362                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5363                                             stcb->asoc.overall_error_count,
5364                                             0,
5365                                             SCTP_FROM_SCTP_INPUT,
5366                                             __LINE__);
5367                                 }
5368                                 stcb->asoc.overall_error_count = 0;
5369                                 sctp_handle_asconf_ack(m, *offset,
5370                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5371                                 if (abort_no_unlock)
5372                                         return (NULL);
5373                         }
5374                         break;
5375                 case SCTP_FORWARD_CUM_TSN:
5376                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5377                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5378                                 /* Its not ours */
5379                                 if (locked_tcb) {
5380                                         SCTP_TCB_UNLOCK(locked_tcb);
5381                                 }
5382                                 *offset = length;
5383                                 return (NULL);
5384                         }
5385                         /* He's alive so give him credit */
5386                         if (stcb) {
5387                                 int abort_flag = 0;
5388
5389                                 if (stcb->asoc.prsctp_supported == 0) {
5390                                         goto unknown_chunk;
5391                                 }
5392                                 stcb->asoc.overall_error_count = 0;
5393                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5394                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5395                                             stcb->asoc.overall_error_count,
5396                                             0,
5397                                             SCTP_FROM_SCTP_INPUT,
5398                                             __LINE__);
5399                                 }
5400                                 *fwd_tsn_seen = 1;
5401                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5402                                         /* We are not interested anymore */
5403 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5404                                         so = SCTP_INP_SO(inp);
5405                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5406                                         SCTP_TCB_UNLOCK(stcb);
5407                                         SCTP_SOCKET_LOCK(so, 1);
5408                                         SCTP_TCB_LOCK(stcb);
5409                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5410 #endif
5411                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5412                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5413 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5414                                         SCTP_SOCKET_UNLOCK(so, 1);
5415 #endif
5416                                         *offset = length;
5417                                         return (NULL);
5418                                 }
5419                                 sctp_handle_forward_tsn(stcb,
5420                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5421                                 if (abort_flag) {
5422                                         *offset = length;
5423                                         return (NULL);
5424                                 } else {
5425                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5426                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5427                                                     stcb->asoc.overall_error_count,
5428                                                     0,
5429                                                     SCTP_FROM_SCTP_INPUT,
5430                                                     __LINE__);
5431                                         }
5432                                         stcb->asoc.overall_error_count = 0;
5433                                 }
5434
5435                         }
5436                         break;
5437                 case SCTP_STREAM_RESET:
5438                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5439                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5440                                 /* Its not ours */
5441                                 if (locked_tcb) {
5442                                         SCTP_TCB_UNLOCK(locked_tcb);
5443                                 }
5444                                 *offset = length;
5445                                 return (NULL);
5446                         }
5447                         if (stcb->asoc.reconfig_supported == 0) {
5448                                 goto unknown_chunk;
5449                         }
5450                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5451                                 /* stop processing */
5452                                 *offset = length;
5453                                 return (NULL);
5454                         }
5455                         break;
5456                 case SCTP_PACKET_DROPPED:
5457                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5458                         /* re-get it all please */
5459                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5460                                 /* Its not ours */
5461                                 if (locked_tcb) {
5462                                         SCTP_TCB_UNLOCK(locked_tcb);
5463                                 }
5464                                 *offset = length;
5465                                 return (NULL);
5466                         }
5467                         if (ch && (stcb) && netp && (*netp)) {
5468                                 if (stcb->asoc.pktdrop_supported == 0) {
5469                                         goto unknown_chunk;
5470                                 }
5471                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5472                                     stcb, *netp,
5473                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5474
5475                         }
5476                         break;
5477                 case SCTP_AUTHENTICATION:
5478                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5479                         if (stcb == NULL) {
5480                                 /* save the first AUTH for later processing */
5481                                 if (auth_skipped == 0) {
5482                                         auth_offset = *offset;
5483                                         auth_len = chk_length;
5484                                         auth_skipped = 1;
5485                                 }
5486                                 /* skip this chunk (temporarily) */
5487                                 goto next_chunk;
5488                         }
5489                         if (stcb->asoc.auth_supported == 0) {
5490                                 goto unknown_chunk;
5491                         }
5492                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5493                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5494                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5495                                 /* Its not ours */
5496                                 if (locked_tcb) {
5497                                         SCTP_TCB_UNLOCK(locked_tcb);
5498                                 }
5499                                 *offset = length;
5500                                 return (NULL);
5501                         }
5502                         if (got_auth == 1) {
5503                                 /* skip this chunk... it's already auth'd */
5504                                 goto next_chunk;
5505                         }
5506                         got_auth = 1;
5507                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5508                             m, *offset)) {
5509                                 /* auth HMAC failed so dump the packet */
5510                                 *offset = length;
5511                                 return (stcb);
5512                         } else {
5513                                 /* remaining chunks are HMAC checked */
5514                                 stcb->asoc.authenticated = 1;
5515                         }
5516                         break;
5517
5518                 default:
5519         unknown_chunk:
5520                         /* it's an unknown chunk! */
5521                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5522                                 struct mbuf *mm;
5523                                 struct sctp_paramhdr *phd;
5524                                 int len;
5525
5526                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5527                                     0, M_NOWAIT, 1, MT_DATA);
5528                                 if (mm) {
5529                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5530                                         phd = mtod(mm, struct sctp_paramhdr *);
5531                                         /*
5532                                          * We cheat and use param type since
5533                                          * we did not bother to define a
5534                                          * error cause struct. They are the
5535                                          * same basic format with different
5536                                          * names.
5537                                          */
5538                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5539                                         phd->param_length = htons(len + sizeof(*phd));
5540                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5541                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5542                                         if (SCTP_BUF_NEXT(mm)) {
5543                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) {
5544                                                         sctp_m_freem(mm);
5545                                                 } else {
5546 #ifdef SCTP_MBUF_LOGGING
5547                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5548                                                                 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY);
5549                                                         }
5550 #endif
5551                                                         sctp_queue_op_err(stcb, mm);
5552                                                 }
5553                                         } else {
5554                                                 sctp_m_freem(mm);
5555                                         }
5556                                 }
5557                         }
5558                         if ((ch->chunk_type & 0x80) == 0) {
5559                                 /* discard this packet */
5560                                 *offset = length;
5561                                 return (stcb);
5562                         }       /* else skip this bad chunk and continue... */
5563                         break;
5564                 }               /* switch (ch->chunk_type) */
5565
5566
5567 next_chunk:
5568                 /* get the next chunk */
5569                 *offset += SCTP_SIZE32(chk_length);
5570                 if (*offset >= length) {
5571                         /* no more data left in the mbuf chain */
5572                         break;
5573                 }
5574                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5575                     sizeof(struct sctp_chunkhdr), chunk_buf);
5576                 if (ch == NULL) {
5577                         if (locked_tcb) {
5578                                 SCTP_TCB_UNLOCK(locked_tcb);
5579                         }
5580                         *offset = length;
5581                         return (NULL);
5582                 }
5583         }                       /* while */
5584
5585         if (asconf_cnt > 0 && stcb != NULL) {
5586                 sctp_send_asconf_ack(stcb);
5587         }
5588         return (stcb);
5589 }
5590
5591
5592 #ifdef INVARIANTS
5593 #ifdef __GNUC__
5594 __attribute__((noinline))
5595 #endif
5596         void
5597              sctp_validate_no_locks(struct sctp_inpcb *inp)
5598 {
5599         struct sctp_tcb *lstcb;
5600
5601         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5602                 if (mtx_owned(&lstcb->tcb_mtx)) {
5603                         panic("Own lock on stcb at return from input");
5604                 }
5605         }
5606         if (mtx_owned(&inp->inp_create_mtx)) {
5607                 panic("Own create lock on inp");
5608         }
5609         if (mtx_owned(&inp->inp_mtx)) {
5610                 panic("Own inp lock on inp");
5611         }
5612 }
5613
5614 #endif
5615
5616 /*
5617  * common input chunk processing (v4 and v6)
5618  */
5619 void
5620 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5621     struct sockaddr *src, struct sockaddr *dst,
5622     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5623 #if !defined(SCTP_WITH_NO_CSUM)
5624     uint8_t compute_crc,
5625 #endif
5626     uint8_t ecn_bits,
5627     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5628     uint32_t vrf_id, uint16_t port)
5629 {
5630         uint32_t high_tsn;
5631         int fwd_tsn_seen = 0, data_processed = 0;
5632         struct mbuf *m = *mm, *op_err;
5633         char msg[SCTP_DIAG_INFO_LEN];
5634         int un_sent;
5635         int cnt_ctrl_ready = 0;
5636         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5637         struct sctp_tcb *stcb = NULL;
5638         struct sctp_nets *net = NULL;
5639
5640         SCTP_STAT_INCR(sctps_recvdatagrams);
5641 #ifdef SCTP_AUDITING_ENABLED
5642         sctp_audit_log(0xE0, 1);
5643         sctp_auditing(0, inp, stcb, net);
5644 #endif
5645 #if !defined(SCTP_WITH_NO_CSUM)
5646         if (compute_crc != 0) {
5647                 uint32_t check, calc_check;
5648
5649                 check = sh->checksum;
5650                 sh->checksum = 0;
5651                 calc_check = sctp_calculate_cksum(m, iphlen);
5652                 sh->checksum = check;
5653                 if (calc_check != check) {
5654                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5655                             calc_check, check, (void *)m, length, iphlen);
5656                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5657                             sh, ch, &inp, &net, vrf_id);
5658 #if defined(INET) || defined(INET6)
5659                         if ((net != NULL) && (port != 0)) {
5660                                 if (net->port == 0) {
5661                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5662                                 }
5663                                 net->port = port;
5664                         }
5665 #endif
5666                         if (net != NULL) {
5667                                 net->flowtype = mflowtype;
5668                                 net->flowid = mflowid;
5669                         }
5670                         if ((inp != NULL) && (stcb != NULL)) {
5671                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5672                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5673                         } else if ((inp != NULL) && (stcb == NULL)) {
5674                                 inp_decr = inp;
5675                         }
5676                         SCTP_STAT_INCR(sctps_badsum);
5677                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5678                         goto out;
5679                 }
5680         }
5681 #endif
5682         /* Destination port of 0 is illegal, based on RFC4960. */
5683         if (sh->dest_port == 0) {
5684                 SCTP_STAT_INCR(sctps_hdrops);
5685                 goto out;
5686         }
5687         stcb = sctp_findassociation_addr(m, offset, src, dst,
5688             sh, ch, &inp, &net, vrf_id);
5689 #if defined(INET) || defined(INET6)
5690         if ((net != NULL) && (port != 0)) {
5691                 if (net->port == 0) {
5692                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5693                 }
5694                 net->port = port;
5695         }
5696 #endif
5697         if (net != NULL) {
5698                 net->flowtype = mflowtype;
5699                 net->flowid = mflowid;
5700         }
5701         if (inp == NULL) {
5702                 SCTP_STAT_INCR(sctps_noport);
5703                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5704                         goto out;
5705                 }
5706                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5707                         sctp_send_shutdown_complete2(src, dst, sh,
5708                             mflowtype, mflowid, fibnum,
5709                             vrf_id, port);
5710                         goto out;
5711                 }
5712                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5713                         goto out;
5714                 }
5715                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5716                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5717                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5718                             (ch->chunk_type != SCTP_INIT))) {
5719                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5720                                     "Out of the blue");
5721                                 sctp_send_abort(m, iphlen, src, dst,
5722                                     sh, 0, op_err,
5723                                     mflowtype, mflowid, fibnum,
5724                                     vrf_id, port);
5725                         }
5726                 }
5727                 goto out;
5728         } else if (stcb == NULL) {
5729                 inp_decr = inp;
5730         }
5731 #ifdef IPSEC
5732         /*-
5733          * I very much doubt any of the IPSEC stuff will work but I have no
5734          * idea, so I will leave it in place.
5735          */
5736         if (inp != NULL) {
5737                 switch (dst->sa_family) {
5738 #ifdef INET
5739                 case AF_INET:
5740                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5741                                 IPSECSTAT_INC(ips_in_polvio);
5742                                 SCTP_STAT_INCR(sctps_hdrops);
5743                                 goto out;
5744                         }
5745                         break;
5746 #endif
5747 #ifdef INET6
5748                 case AF_INET6:
5749                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5750                                 IPSEC6STAT_INC(ips_in_polvio);
5751                                 SCTP_STAT_INCR(sctps_hdrops);
5752                                 goto out;
5753                         }
5754                         break;
5755 #endif
5756                 default:
5757                         break;
5758                 }
5759         }
5760 #endif
5761         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5762             (void *)m, iphlen, offset, length, (void *)stcb);
5763         if (stcb) {
5764                 /* always clear this before beginning a packet */
5765                 stcb->asoc.authenticated = 0;
5766                 stcb->asoc.seen_a_sack_this_pkt = 0;
5767                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5768                     (void *)stcb, stcb->asoc.state);
5769
5770                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5771                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5772                         /*-
5773                          * If we hit here, we had a ref count
5774                          * up when the assoc was aborted and the
5775                          * timer is clearing out the assoc, we should
5776                          * NOT respond to any packet.. its OOTB.
5777                          */
5778                         SCTP_TCB_UNLOCK(stcb);
5779                         stcb = NULL;
5780                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5781                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5782                             msg);
5783                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5784                             mflowtype, mflowid, inp->fibnum,
5785                             vrf_id, port);
5786                         goto out;
5787                 }
5788         }
5789         if (IS_SCTP_CONTROL(ch)) {
5790                 /* process the control portion of the SCTP packet */
5791                 /* sa_ignore NO_NULL_CHK */
5792                 stcb = sctp_process_control(m, iphlen, &offset, length,
5793                     src, dst, sh, ch,
5794                     inp, stcb, &net, &fwd_tsn_seen,
5795                     mflowtype, mflowid, fibnum,
5796                     vrf_id, port);
5797                 if (stcb) {
5798                         /*
5799                          * This covers us if the cookie-echo was there and
5800                          * it changes our INP.
5801                          */
5802                         inp = stcb->sctp_ep;
5803 #if defined(INET) || defined(INET6)
5804                         if ((net) && (port)) {
5805                                 if (net->port == 0) {
5806                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5807                                 }
5808                                 net->port = port;
5809                         }
5810 #endif
5811                 }
5812         } else {
5813                 /*
5814                  * no control chunks, so pre-process DATA chunks (these
5815                  * checks are taken care of by control processing)
5816                  */
5817
5818                 /*
5819                  * if DATA only packet, and auth is required, then punt...
5820                  * can't have authenticated without any AUTH (control)
5821                  * chunks
5822                  */
5823                 if ((stcb != NULL) &&
5824                     (stcb->asoc.auth_supported == 1) &&
5825                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5826                         /* "silently" ignore */
5827                         SCTP_STAT_INCR(sctps_recvauthmissing);
5828                         goto out;
5829                 }
5830                 if (stcb == NULL) {
5831                         /* out of the blue DATA chunk */
5832                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5833                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5834                             msg);
5835                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5836                             mflowtype, mflowid, fibnum,
5837                             vrf_id, port);
5838                         goto out;
5839                 }
5840                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5841                         /* v_tag mismatch! */
5842                         SCTP_STAT_INCR(sctps_badvtag);
5843                         goto out;
5844                 }
5845         }
5846
5847         if (stcb == NULL) {
5848                 /*
5849                  * no valid TCB for this packet, or we found it's a bad
5850                  * packet while processing control, or we're done with this
5851                  * packet (done or skip rest of data), so we drop it...
5852                  */
5853                 goto out;
5854         }
5855         /*
5856          * DATA chunk processing
5857          */
5858         /* plow through the data chunks while length > offset */
5859
5860         /*
5861          * Rest should be DATA only.  Check authentication state if AUTH for
5862          * DATA is required.
5863          */
5864         if ((length > offset) &&
5865             (stcb != NULL) &&
5866             (stcb->asoc.auth_supported == 1) &&
5867             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5868             !stcb->asoc.authenticated) {
5869                 /* "silently" ignore */
5870                 SCTP_STAT_INCR(sctps_recvauthmissing);
5871                 SCTPDBG(SCTP_DEBUG_AUTH1,
5872                     "Data chunk requires AUTH, skipped\n");
5873                 goto trigger_send;
5874         }
5875         if (length > offset) {
5876                 int retval;
5877
5878                 /*
5879                  * First check to make sure our state is correct. We would
5880                  * not get here unless we really did have a tag, so we don't
5881                  * abort if this happens, just dump the chunk silently.
5882                  */
5883                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5884                 case SCTP_STATE_COOKIE_ECHOED:
5885                         /*
5886                          * we consider data with valid tags in this state
5887                          * shows us the cookie-ack was lost. Imply it was
5888                          * there.
5889                          */
5890                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5891                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5892                                     stcb->asoc.overall_error_count,
5893                                     0,
5894                                     SCTP_FROM_SCTP_INPUT,
5895                                     __LINE__);
5896                         }
5897                         stcb->asoc.overall_error_count = 0;
5898                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5899                         break;
5900                 case SCTP_STATE_COOKIE_WAIT:
5901                         /*
5902                          * We consider OOTB any data sent during asoc setup.
5903                          */
5904                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5905                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5906                             msg);
5907                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5908                             mflowtype, mflowid, inp->fibnum,
5909                             vrf_id, port);
5910                         goto out;
5911                         /* sa_ignore NOTREACHED */
5912                         break;
5913                 case SCTP_STATE_EMPTY:  /* should not happen */
5914                 case SCTP_STATE_INUSE:  /* should not happen */
5915                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5916                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5917                 default:
5918                         goto out;
5919                         /* sa_ignore NOTREACHED */
5920                         break;
5921                 case SCTP_STATE_OPEN:
5922                 case SCTP_STATE_SHUTDOWN_SENT:
5923                         break;
5924                 }
5925                 /* plow through the data chunks while length > offset */
5926                 retval = sctp_process_data(mm, iphlen, &offset, length,
5927                     src, dst, sh,
5928                     inp, stcb, net, &high_tsn,
5929                     mflowtype, mflowid,
5930                     vrf_id, port);
5931                 if (retval == 2) {
5932                         /*
5933                          * The association aborted, NO UNLOCK needed since
5934                          * the association is destroyed.
5935                          */
5936                         stcb = NULL;
5937                         goto out;
5938                 }
5939                 data_processed = 1;
5940                 /*
5941                  * Anything important needs to have been m_copy'ed in
5942                  * process_data
5943                  */
5944         }
5945         /* take care of ecn */
5946         if ((data_processed == 1) &&
5947             (stcb->asoc.ecn_supported == 1) &&
5948             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5949                 /* Yep, we need to add a ECNE */
5950                 sctp_send_ecn_echo(stcb, net, high_tsn);
5951         }
5952         if ((data_processed == 0) && (fwd_tsn_seen)) {
5953                 int was_a_gap;
5954                 uint32_t highest_tsn;
5955
5956                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5957                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5958                 } else {
5959                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5960                 }
5961                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5962                 stcb->asoc.send_sack = 1;
5963                 sctp_sack_check(stcb, was_a_gap);
5964         } else if (fwd_tsn_seen) {
5965                 stcb->asoc.send_sack = 1;
5966         }
5967         /* trigger send of any chunks in queue... */
5968 trigger_send:
5969 #ifdef SCTP_AUDITING_ENABLED
5970         sctp_audit_log(0xE0, 2);
5971         sctp_auditing(1, inp, stcb, net);
5972 #endif
5973         SCTPDBG(SCTP_DEBUG_INPUT1,
5974             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5975             stcb->asoc.peers_rwnd,
5976             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5977             stcb->asoc.total_flight);
5978         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5979         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5980                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5981         }
5982         if (cnt_ctrl_ready ||
5983             ((un_sent) &&
5984             (stcb->asoc.peers_rwnd > 0 ||
5985             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5986                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5987                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5988                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5989         }
5990 #ifdef SCTP_AUDITING_ENABLED
5991         sctp_audit_log(0xE0, 3);
5992         sctp_auditing(2, inp, stcb, net);
5993 #endif
5994 out:
5995         if (stcb != NULL) {
5996                 SCTP_TCB_UNLOCK(stcb);
5997         }
5998         if (inp_decr != NULL) {
5999                 /* reduce ref-count */
6000                 SCTP_INP_WLOCK(inp_decr);
6001                 SCTP_INP_DECR_REF(inp_decr);
6002                 SCTP_INP_WUNLOCK(inp_decr);
6003         }
6004 #ifdef INVARIANTS
6005         if (inp != NULL) {
6006                 sctp_validate_no_locks(inp);
6007         }
6008 #endif
6009         return;
6010 }
6011
6012 #if 0
6013 static void
6014 sctp_print_mbuf_chain(struct mbuf *m)
6015 {
6016         for (; m; m = SCTP_BUF_NEXT(m)) {
6017                 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
6018                 if (SCTP_BUF_IS_EXTENDED(m))
6019                         SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
6020         }
6021 }
6022
6023 #endif
6024
6025 #ifdef INET
6026 void
6027 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6028 {
6029         struct mbuf *m;
6030         int iphlen;
6031         uint32_t vrf_id = 0;
6032         uint8_t ecn_bits;
6033         struct sockaddr_in src, dst;
6034         struct ip *ip;
6035         struct sctphdr *sh;
6036         struct sctp_chunkhdr *ch;
6037         int length, offset;
6038
6039 #if !defined(SCTP_WITH_NO_CSUM)
6040         uint8_t compute_crc;
6041
6042 #endif
6043         uint32_t mflowid;
6044         uint8_t mflowtype;
6045         uint16_t fibnum;
6046
6047         iphlen = off;
6048         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6049                 SCTP_RELEASE_PKT(i_pak);
6050                 return;
6051         }
6052         m = SCTP_HEADER_TO_CHAIN(i_pak);
6053 #ifdef SCTP_MBUF_LOGGING
6054         /* Log in any input mbufs */
6055         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6056                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6057         }
6058 #endif
6059 #ifdef SCTP_PACKET_LOGGING
6060         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6061                 sctp_packet_log(m);
6062         }
6063 #endif
6064         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6065             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6066             m->m_pkthdr.len,
6067             if_name(m->m_pkthdr.rcvif),
6068             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6069         mflowid = m->m_pkthdr.flowid;
6070         mflowtype = M_HASHTYPE_GET(m);
6071         fibnum = M_GETFIB(m);
6072         SCTP_STAT_INCR(sctps_recvpackets);
6073         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6074         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6075         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6076         if (SCTP_BUF_LEN(m) < offset) {
6077                 if ((m = m_pullup(m, offset)) == NULL) {
6078                         SCTP_STAT_INCR(sctps_hdrops);
6079                         return;
6080                 }
6081         }
6082         ip = mtod(m, struct ip *);
6083         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6084         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6085         offset -= sizeof(struct sctp_chunkhdr);
6086         memset(&src, 0, sizeof(struct sockaddr_in));
6087         src.sin_family = AF_INET;
6088         src.sin_len = sizeof(struct sockaddr_in);
6089         src.sin_port = sh->src_port;
6090         src.sin_addr = ip->ip_src;
6091         memset(&dst, 0, sizeof(struct sockaddr_in));
6092         dst.sin_family = AF_INET;
6093         dst.sin_len = sizeof(struct sockaddr_in);
6094         dst.sin_port = sh->dest_port;
6095         dst.sin_addr = ip->ip_dst;
6096         length = ntohs(ip->ip_len);
6097         /* Validate mbuf chain length with IP payload length. */
6098         if (SCTP_HEADER_LEN(m) != length) {
6099                 SCTPDBG(SCTP_DEBUG_INPUT1,
6100                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6101                 SCTP_STAT_INCR(sctps_hdrops);
6102                 goto out;
6103         }
6104         /* SCTP does not allow broadcasts or multicasts */
6105         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6106                 goto out;
6107         }
6108         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6109                 goto out;
6110         }
6111         ecn_bits = ip->ip_tos;
6112 #if defined(SCTP_WITH_NO_CSUM)
6113         SCTP_STAT_INCR(sctps_recvnocrc);
6114 #else
6115         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6116                 SCTP_STAT_INCR(sctps_recvhwcrc);
6117                 compute_crc = 0;
6118         } else {
6119                 SCTP_STAT_INCR(sctps_recvswcrc);
6120                 compute_crc = 1;
6121         }
6122 #endif
6123         sctp_common_input_processing(&m, iphlen, offset, length,
6124             (struct sockaddr *)&src,
6125             (struct sockaddr *)&dst,
6126             sh, ch,
6127 #if !defined(SCTP_WITH_NO_CSUM)
6128             compute_crc,
6129 #endif
6130             ecn_bits,
6131             mflowtype, mflowid, fibnum,
6132             vrf_id, port);
6133 out:
6134         if (m) {
6135                 sctp_m_freem(m);
6136         }
6137         return;
6138 }
6139
6140 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6141 extern int *sctp_cpuarry;
6142
6143 #endif
6144
6145 void
6146 sctp_input(struct mbuf *m, int off)
6147 {
6148 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6149         struct ip *ip;
6150         struct sctphdr *sh;
6151         int offset;
6152         int cpu_to_use;
6153         uint32_t flowid, tag;
6154
6155         if (mp_ncpus > 1) {
6156                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6157                         flowid = m->m_pkthdr.flowid;
6158                 } else {
6159                         /*
6160                          * No flow id built by lower layers fix it so we
6161                          * create one.
6162                          */
6163                         offset = off + sizeof(struct sctphdr);
6164                         if (SCTP_BUF_LEN(m) < offset) {
6165                                 if ((m = m_pullup(m, offset)) == NULL) {
6166                                         SCTP_STAT_INCR(sctps_hdrops);
6167                                         return;
6168                                 }
6169                         }
6170                         ip = mtod(m, struct ip *);
6171                         sh = (struct sctphdr *)((caddr_t)ip + off);
6172                         tag = htonl(sh->v_tag);
6173                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6174                         m->m_pkthdr.flowid = flowid;
6175                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6176                 }
6177                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6178                 sctp_queue_to_mcore(m, off, cpu_to_use);
6179                 return;
6180         }
6181 #endif
6182         sctp_input_with_port(m, off, 0);
6183 }
6184
6185 #endif