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,
 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_4);
 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, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 637                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 638         }
 639         old_error_counter = r_net->error_count;
 640         r_net->error_count = 0;
 641         r_net->hb_responded = 1;
 642         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 643         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 644         /* Now lets do a RTO with this */
 645         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 646             SCTP_RTT_FROM_NON_DATA);
 647         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 648                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 649                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 650                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 651         }
 652         if (r_net->dest_state & SCTP_ADDR_PF) {
 653                 r_net->dest_state &= ~SCTP_ADDR_PF;
 654                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 655         }
 656         if (old_error_counter > 0) {
 657                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 658                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 659         }
 660         if (r_net == stcb->asoc.primary_destination) {
 661                 if (stcb->asoc.alternate) {
 662                         /* release the alternate, primary is good */
 663                         sctp_free_remote_addr(stcb->asoc.alternate);
 664                         stcb->asoc.alternate = NULL;
 665                 }
 666         }
 667         /* Mobility adaptation */
 668         if (req_prim) {
 669                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 670                     SCTP_MOBILITY_BASE) ||
 671                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 672                     SCTP_MOBILITY_FASTHANDOFF)) &&
 673                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 674                     SCTP_MOBILITY_PRIM_DELETED)) {
 675
 676                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 677                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 678                             SCTP_MOBILITY_FASTHANDOFF)) {
 679                                 sctp_assoc_immediate_retrans(stcb,
 680                                     stcb->asoc.primary_destination);
 681                         }
 682                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 683                             SCTP_MOBILITY_BASE)) {
 684                                 sctp_move_chunks_from_net(stcb,
 685                                     stcb->asoc.deleted_primary);
 686                         }
 687                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 688                             stcb->asoc.deleted_primary);
 689                 }
 690         }
 691 }
 692
 693 static int
 694 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 695 {
 696         /*
 697          * return 0 means we want you to proceed with the abort non-zero
 698          * means no abort processing
 699          */
 700         struct sctpasochead *head;
 701
 702         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 703                 /* generate a new vtag and send init */
 704                 LIST_REMOVE(stcb, sctp_asocs);
 705                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 706                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 707                 /*
 708                  * put it in the bucket in the vtag hash of assoc's for the
 709                  * system
 710                  */
 711                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 712                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 713                 return (1);
 714         }
 715         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 716                 /*
 717                  * treat like a case where the cookie expired i.e.: - dump
 718                  * current cookie. - generate a new vtag. - resend init.
 719                  */
 720                 /* generate a new vtag and send init */
 721                 LIST_REMOVE(stcb, sctp_asocs);
 722                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 723                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 724                 sctp_stop_all_cookie_timers(stcb);
 725                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 726                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 727                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 728                 /*
 729                  * put it in the bucket in the vtag hash of assoc's for the
 730                  * system
 731                  */
 732                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 733                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 734                 return (1);
 735         }
 736         return (0);
 737 }
 738
 739 static int
 740 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 741     struct sctp_nets *net)
 742 {
 743         /*
 744          * return 0 means we want you to proceed with the abort non-zero
 745          * means no abort processing
 746          */
 747         if (stcb->asoc.auth_supported == 0) {
 748                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 749                 return (0);
 750         }
 751         sctp_asconf_send_nat_state_update(stcb, net);
 752         return (1);
 753 }
 754
 755
 756 static void
 757 sctp_handle_abort(struct sctp_abort_chunk *abort,
 758     struct sctp_tcb *stcb, struct sctp_nets *net)
 759 {
 760 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 761         struct socket *so;
 762
 763 #endif
 764         uint16_t len;
 765         uint16_t error;
 766
 767         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 768         if (stcb == NULL)
 769                 return;
 770
 771         len = ntohs(abort->ch.chunk_length);
 772         if (len > sizeof(struct sctp_chunkhdr)) {
 773                 /*
 774                  * Need to check the cause codes for our two magic nat
 775                  * aborts which don't kill the assoc necessarily.
 776                  */
 777                 struct sctp_missing_nat_state *natc;
 778
 779                 natc = (struct sctp_missing_nat_state *)(abort + 1);
 780                 error = ntohs(natc->cause);
 781                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 782                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 783                             abort->ch.chunk_flags);
 784                         if (sctp_handle_nat_colliding_state(stcb)) {
 785                                 return;
 786                         }
 787                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 788                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 789                             abort->ch.chunk_flags);
 790                         if (sctp_handle_nat_missing_state(stcb, net)) {
 791                                 return;
 792                         }
 793                 }
 794         } else {
 795                 error = 0;
 796         }
 797         /* stop any receive timers */
 798         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 799         /* notify user of the abort and clean up... */
 800         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 801         /* free the tcb */
 802         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 803         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 804             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 805                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 806         }
 807 #ifdef SCTP_ASOCLOG_OF_TSNS
 808         sctp_print_out_track_log(stcb);
 809 #endif
 810 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 811         so = SCTP_INP_SO(stcb->sctp_ep);
 812         atomic_add_int(&stcb->asoc.refcnt, 1);
 813         SCTP_TCB_UNLOCK(stcb);
 814         SCTP_SOCKET_LOCK(so, 1);
 815         SCTP_TCB_LOCK(stcb);
 816         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 817 #endif
 818         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 819         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 820             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 821 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 822         SCTP_SOCKET_UNLOCK(so, 1);
 823 #endif
 824         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 825 }
 826
 827 static void
 828 sctp_start_net_timers(struct sctp_tcb *stcb)
 829 {
 830         uint32_t cnt_hb_sent;
 831         struct sctp_nets *net;
 832
 833         cnt_hb_sent = 0;
 834         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 835                 /*
 836                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 837                  * If the dest in unconfirmed send a hb as well if under
 838                  * max_hb_burst have been sent.
 839                  */
 840                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 841                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 842                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 843                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 844                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 845                         cnt_hb_sent++;
 846                 }
 847         }
 848         if (cnt_hb_sent) {
 849                 sctp_chunk_output(stcb->sctp_ep, stcb,
 850                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 851                     SCTP_SO_NOT_LOCKED);
 852         }
 853 }
 854
 855
 856 static void
 857 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 858     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 859 {
 860         struct sctp_association *asoc;
 861         int some_on_streamwheel;
 862
 863 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 864         struct socket *so;
 865
 866 #endif
 867
 868         SCTPDBG(SCTP_DEBUG_INPUT2,
 869             "sctp_handle_shutdown: handling SHUTDOWN\n");
 870         if (stcb == NULL)
 871                 return;
 872         asoc = &stcb->asoc;
 873         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 874             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 875                 return;
 876         }
 877         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 878                 /* Shutdown NOT the expected size */
 879                 return;
 880         } else {
 881                 sctp_update_acked(stcb, cp, abort_flag);
 882                 if (*abort_flag) {
 883                         return;
 884                 }
 885         }
 886         if (asoc->control_pdapi) {
 887                 /*
 888                  * With a normal shutdown we assume the end of last record.
 889                  */
 890                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 891                 asoc->control_pdapi->end_added = 1;
 892                 asoc->control_pdapi->pdapi_aborted = 1;
 893                 asoc->control_pdapi = NULL;
 894                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 895 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 896                 so = SCTP_INP_SO(stcb->sctp_ep);
 897                 atomic_add_int(&stcb->asoc.refcnt, 1);
 898                 SCTP_TCB_UNLOCK(stcb);
 899                 SCTP_SOCKET_LOCK(so, 1);
 900                 SCTP_TCB_LOCK(stcb);
 901                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 902                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 903                         /* assoc was freed while we were unlocked */
 904                         SCTP_SOCKET_UNLOCK(so, 1);
 905                         return;
 906                 }
 907 #endif
 908                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 909 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 910                 SCTP_SOCKET_UNLOCK(so, 1);
 911 #endif
 912         }
 913         /* goto SHUTDOWN_RECEIVED state to block new requests */
 914         if (stcb->sctp_socket) {
 915                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 916                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 917                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 918                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 919                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 920                         /*
 921                          * notify upper layer that peer has initiated a
 922                          * shutdown
 923                          */
 924                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 925
 926                         /* reset time */
 927                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 928                 }
 929         }
 930         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 931                 /*
 932                  * stop the shutdown timer, since we WILL move to
 933                  * SHUTDOWN-ACK-SENT.
 934                  */
 935                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 936         }
 937         /* Now is there unsent data on a stream somewhere? */
 938         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 939
 940         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 941             !TAILQ_EMPTY(&asoc->sent_queue) ||
 942             some_on_streamwheel) {
 943                 /* By returning we will push more data out */
 944                 return;
 945         } else {
 946                 /* no outstanding data to send, so move on... */
 947                 /* send SHUTDOWN-ACK */
 948                 /* move to SHUTDOWN-ACK-SENT state */
 949                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 950                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 951                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 952                 }
 953                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 954                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 955                 sctp_stop_timers_for_shutdown(stcb);
 956                 sctp_send_shutdown_ack(stcb, net);
 957                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 958                     stcb, net);
 959         }
 960 }
 961
 962 static void
 963 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 964     struct sctp_tcb *stcb,
 965     struct sctp_nets *net)
 966 {
 967         struct sctp_association *asoc;
 968
 969 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 970         struct socket *so;
 971
 972         so = SCTP_INP_SO(stcb->sctp_ep);
 973 #endif
 974         SCTPDBG(SCTP_DEBUG_INPUT2,
 975             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 976         if (stcb == NULL)
 977                 return;
 978
 979         asoc = &stcb->asoc;
 980         /* process according to association state */
 981         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 982             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 983                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 984                 sctp_send_shutdown_complete(stcb, net, 1);
 985                 SCTP_TCB_UNLOCK(stcb);
 986                 return;
 987         }
 988         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 989             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 990                 /* unexpected SHUTDOWN-ACK... so ignore... */
 991                 SCTP_TCB_UNLOCK(stcb);
 992                 return;
 993         }
 994         if (asoc->control_pdapi) {
 995                 /*
 996                  * With a normal shutdown we assume the end of last record.
 997                  */
 998                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 999                 asoc->control_pdapi->end_added = 1;
1000                 asoc->control_pdapi->pdapi_aborted = 1;
1001                 asoc->control_pdapi = NULL;
1002                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1003 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1004                 atomic_add_int(&stcb->asoc.refcnt, 1);
1005                 SCTP_TCB_UNLOCK(stcb);
1006                 SCTP_SOCKET_LOCK(so, 1);
1007                 SCTP_TCB_LOCK(stcb);
1008                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1009                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1010                         /* assoc was freed while we were unlocked */
1011                         SCTP_SOCKET_UNLOCK(so, 1);
1012                         return;
1013                 }
1014 #endif
1015                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1016 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1017                 SCTP_SOCKET_UNLOCK(so, 1);
1018 #endif
1019         }
1020 #ifdef INVARIANTS
1021         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1022             !TAILQ_EMPTY(&asoc->sent_queue) ||
1023             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1024                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1025         }
1026 #endif
1027         /* stop the timer */
1028         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1029         /* send SHUTDOWN-COMPLETE */
1030         sctp_send_shutdown_complete(stcb, net, 0);
1031         /* notify upper layer protocol */
1032         if (stcb->sctp_socket) {
1033                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1034                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1035                         stcb->sctp_socket->so_snd.sb_cc = 0;
1036                 }
1037                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1038         }
1039         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1040         /* free the TCB but first save off the ep */
1041 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1042         atomic_add_int(&stcb->asoc.refcnt, 1);
1043         SCTP_TCB_UNLOCK(stcb);
1044         SCTP_SOCKET_LOCK(so, 1);
1045         SCTP_TCB_LOCK(stcb);
1046         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1047 #endif
1048         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1049             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1050 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1051         SCTP_SOCKET_UNLOCK(so, 1);
1052 #endif
1053 }
1054
1055 /*
1056  * Skip past the param header and then we will find the chunk that caused the
1057  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1058  * our peer must be broken.
1059  */
1060 static void
1061 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1062     struct sctp_nets *net)
1063 {
1064         struct sctp_chunkhdr *chk;
1065
1066         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1067         switch (chk->chunk_type) {
1068         case SCTP_ASCONF_ACK:
1069         case SCTP_ASCONF:
1070                 sctp_asconf_cleanup(stcb, net);
1071                 break;
1072         case SCTP_FORWARD_CUM_TSN:
1073                 stcb->asoc.prsctp_supported = 0;
1074                 break;
1075         default:
1076                 SCTPDBG(SCTP_DEBUG_INPUT2,
1077                     "Peer does not support chunk type %d(%x)??\n",
1078                     chk->chunk_type, (uint32_t) chk->chunk_type);
1079                 break;
1080         }
1081 }
1082
1083 /*
1084  * Skip past the param header and then we will find the param that caused the
1085  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1086  * these will turn of specific features.
1087  * XXX: Is this the right thing to do?
1088  */
1089 static void
1090 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1091 {
1092         struct sctp_paramhdr *pbad;
1093
1094         pbad = phdr + 1;
1095         switch (ntohs(pbad->param_type)) {
1096                 /* pr-sctp draft */
1097         case SCTP_PRSCTP_SUPPORTED:
1098                 stcb->asoc.prsctp_supported = 0;
1099                 break;
1100         case SCTP_SUPPORTED_CHUNK_EXT:
1101                 break;
1102                 /* draft-ietf-tsvwg-addip-sctp */
1103         case SCTP_HAS_NAT_SUPPORT:
1104                 stcb->asoc.peer_supports_nat = 0;
1105                 break;
1106         case SCTP_ADD_IP_ADDRESS:
1107         case SCTP_DEL_IP_ADDRESS:
1108         case SCTP_SET_PRIM_ADDR:
1109                 stcb->asoc.asconf_supported = 0;
1110                 break;
1111         case SCTP_SUCCESS_REPORT:
1112         case SCTP_ERROR_CAUSE_IND:
1113                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1114                 SCTPDBG(SCTP_DEBUG_INPUT2,
1115                     "Turning off ASCONF to this strange peer\n");
1116                 stcb->asoc.asconf_supported = 0;
1117                 break;
1118         default:
1119                 SCTPDBG(SCTP_DEBUG_INPUT2,
1120                     "Peer does not support param type %d(%x)??\n",
1121                     pbad->param_type, (uint32_t) pbad->param_type);
1122                 break;
1123         }
1124 }
1125
1126 static int
1127 sctp_handle_error(struct sctp_chunkhdr *ch,
1128     struct sctp_tcb *stcb, struct sctp_nets *net)
1129 {
1130         int chklen;
1131         struct sctp_paramhdr *phdr;
1132         uint16_t error, error_type;
1133         uint16_t error_len;
1134         struct sctp_association *asoc;
1135         int adjust;
1136
1137 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1138         struct socket *so;
1139
1140 #endif
1141
1142         /* parse through all of the errors and process */
1143         asoc = &stcb->asoc;
1144         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1145             sizeof(struct sctp_chunkhdr));
1146         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1147         error = 0;
1148         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1149                 /* Process an Error Cause */
1150                 error_type = ntohs(phdr->param_type);
1151                 error_len = ntohs(phdr->param_length);
1152                 if ((error_len > chklen) || (error_len == 0)) {
1153                         /* invalid param length for this param */
1154                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1155                             chklen, error_len);
1156                         return (0);
1157                 }
1158                 if (error == 0) {
1159                         /* report the first error cause */
1160                         error = error_type;
1161                 }
1162                 switch (error_type) {
1163                 case SCTP_CAUSE_INVALID_STREAM:
1164                 case SCTP_CAUSE_MISSING_PARAM:
1165                 case SCTP_CAUSE_INVALID_PARAM:
1166                 case SCTP_CAUSE_NO_USER_DATA:
1167                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1168                             error_type);
1169                         break;
1170                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1171                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1172                             ch->chunk_flags);
1173                         if (sctp_handle_nat_colliding_state(stcb)) {
1174                                 return (0);
1175                         }
1176                         break;
1177                 case SCTP_CAUSE_NAT_MISSING_STATE:
1178                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1179                             ch->chunk_flags);
1180                         if (sctp_handle_nat_missing_state(stcb, net)) {
1181                                 return (0);
1182                         }
1183                         break;
1184                 case SCTP_CAUSE_STALE_COOKIE:
1185                         /*
1186                          * We only act if we have echoed a cookie and are
1187                          * waiting.
1188                          */
1189                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1190                                 int *p;
1191
1192                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1193                                 /* Save the time doubled */
1194                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1195                                 asoc->stale_cookie_count++;
1196                                 if (asoc->stale_cookie_count >
1197                                     asoc->max_init_times) {
1198                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1199                                         /* now free the asoc */
1200 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1201                                         so = SCTP_INP_SO(stcb->sctp_ep);
1202                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1203                                         SCTP_TCB_UNLOCK(stcb);
1204                                         SCTP_SOCKET_LOCK(so, 1);
1205                                         SCTP_TCB_LOCK(stcb);
1206                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1207 #endif
1208                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1209                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1210 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1211                                         SCTP_SOCKET_UNLOCK(so, 1);
1212 #endif
1213                                         return (-1);
1214                                 }
1215                                 /* blast back to INIT state */
1216                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1217                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1218                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1219                                 sctp_stop_all_cookie_timers(stcb);
1220                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1221                         }
1222                         break;
1223                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1224                         /*
1225                          * Nothing we can do here, we don't do hostname
1226                          * addresses so if the peer does not like my IPv6
1227                          * (or IPv4 for that matter) it does not matter. If
1228                          * they don't support that type of address, they can
1229                          * NOT possibly get that packet type... i.e. with no
1230                          * IPv6 you can't recieve a IPv6 packet. so we can
1231                          * safely ignore this one. If we ever added support
1232                          * for HOSTNAME Addresses, then we would need to do
1233                          * something here.
1234                          */
1235                         break;
1236                 case SCTP_CAUSE_UNRECOG_CHUNK:
1237                         sctp_process_unrecog_chunk(stcb, phdr, net);
1238                         break;
1239                 case SCTP_CAUSE_UNRECOG_PARAM:
1240                         sctp_process_unrecog_param(stcb, phdr);
1241                         break;
1242                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1243                         /*
1244                          * We ignore this since the timer will drive out a
1245                          * new cookie anyway and there timer will drive us
1246                          * to send a SHUTDOWN_COMPLETE. We can't send one
1247                          * here since we don't have their tag.
1248                          */
1249                         break;
1250                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1251                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1252                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1253                         /*
1254                          * We should NOT get these here, but in a
1255                          * ASCONF-ACK.
1256                          */
1257                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1258                             error_type);
1259                         break;
1260                 case SCTP_CAUSE_OUT_OF_RESC:
1261                         /*
1262                          * And what, pray tell do we do with the fact that
1263                          * the peer is out of resources? Not really sure we
1264                          * could do anything but abort. I suspect this
1265                          * should have came WITH an abort instead of in a
1266                          * OP-ERROR.
1267                          */
1268                         break;
1269                 default:
1270                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1271                             error_type);
1272                         break;
1273                 }
1274                 adjust = SCTP_SIZE32(error_len);
1275                 chklen -= adjust;
1276                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1277         }
1278         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1279         return (0);
1280 }
1281
1282 static int
1283 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1284     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1285     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1286     struct sctp_nets *net, int *abort_no_unlock,
1287     uint8_t mflowtype, uint32_t mflowid,
1288     uint32_t vrf_id)
1289 {
1290         struct sctp_init_ack *init_ack;
1291         struct mbuf *op_err;
1292
1293         SCTPDBG(SCTP_DEBUG_INPUT2,
1294             "sctp_handle_init_ack: handling INIT-ACK\n");
1295
1296         if (stcb == NULL) {
1297                 SCTPDBG(SCTP_DEBUG_INPUT2,
1298                     "sctp_handle_init_ack: TCB is null\n");
1299                 return (-1);
1300         }
1301         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1302                 /* Invalid length */
1303                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1304                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1305                     src, dst, sh, op_err,
1306                     mflowtype, mflowid,
1307                     vrf_id, net->port);
1308                 *abort_no_unlock = 1;
1309                 return (-1);
1310         }
1311         init_ack = &cp->init;
1312         /* validate parameters */
1313         if (init_ack->initiate_tag == 0) {
1314                 /* protocol error... send an abort */
1315                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1316                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1317                     src, dst, sh, op_err,
1318                     mflowtype, mflowid,
1319                     vrf_id, net->port);
1320                 *abort_no_unlock = 1;
1321                 return (-1);
1322         }
1323         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1324                 /* protocol error... send an abort */
1325                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1326                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1327                     src, dst, sh, op_err,
1328                     mflowtype, mflowid,
1329                     vrf_id, net->port);
1330                 *abort_no_unlock = 1;
1331                 return (-1);
1332         }
1333         if (init_ack->num_inbound_streams == 0) {
1334                 /* protocol error... send an abort */
1335                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1336                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1337                     src, dst, sh, op_err,
1338                     mflowtype, mflowid,
1339                     vrf_id, net->port);
1340                 *abort_no_unlock = 1;
1341                 return (-1);
1342         }
1343         if (init_ack->num_outbound_streams == 0) {
1344                 /* protocol error... send an abort */
1345                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1346                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1347                     src, dst, sh, op_err,
1348                     mflowtype, mflowid,
1349                     vrf_id, net->port);
1350                 *abort_no_unlock = 1;
1351                 return (-1);
1352         }
1353         /* process according to association state... */
1354         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1355         case SCTP_STATE_COOKIE_WAIT:
1356                 /* this is the expected state for this chunk */
1357                 /* process the INIT-ACK parameters */
1358                 if (stcb->asoc.primary_destination->dest_state &
1359                     SCTP_ADDR_UNCONFIRMED) {
1360                         /*
1361                          * The primary is where we sent the INIT, we can
1362                          * always consider it confirmed when the INIT-ACK is
1363                          * returned. Do this before we load addresses
1364                          * though.
1365                          */
1366                         stcb->asoc.primary_destination->dest_state &=
1367                             ~SCTP_ADDR_UNCONFIRMED;
1368                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1369                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1370                 }
1371                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1372                     net, abort_no_unlock,
1373                     mflowtype, mflowid,
1374                     vrf_id) < 0) {
1375                         /* error in parsing parameters */
1376                         return (-1);
1377                 }
1378                 /* update our state */
1379                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1380                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1381
1382                 /* reset the RTO calc */
1383                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1384                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1385                             stcb->asoc.overall_error_count,
1386                             0,
1387                             SCTP_FROM_SCTP_INPUT,
1388                             __LINE__);
1389                 }
1390                 stcb->asoc.overall_error_count = 0;
1391                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1392                 /*
1393                  * collapse the init timer back in case of a exponential
1394                  * backoff
1395                  */
1396                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1397                     stcb, net);
1398                 /*
1399                  * the send at the end of the inbound data processing will
1400                  * cause the cookie to be sent
1401                  */
1402                 break;
1403         case SCTP_STATE_SHUTDOWN_SENT:
1404                 /* incorrect state... discard */
1405                 break;
1406         case SCTP_STATE_COOKIE_ECHOED:
1407                 /* incorrect state... discard */
1408                 break;
1409         case SCTP_STATE_OPEN:
1410                 /* incorrect state... discard */
1411                 break;
1412         case SCTP_STATE_EMPTY:
1413         case SCTP_STATE_INUSE:
1414         default:
1415                 /* incorrect state... discard */
1416                 return (-1);
1417                 break;
1418         }
1419         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1420         return (0);
1421 }
1422
1423 static struct sctp_tcb *
1424 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1425     struct sockaddr *src, struct sockaddr *dst,
1426     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1427     struct sctp_inpcb *inp, struct sctp_nets **netp,
1428     struct sockaddr *init_src, int *notification,
1429     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1430     uint8_t mflowtype, uint32_t mflowid,
1431     uint32_t vrf_id, uint16_t port);
1432
1433
1434 /*
1435  * handle a state cookie for an existing association m: input packet mbuf
1436  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1437  * "split" mbuf and the cookie signature does not exist offset: offset into
1438  * mbuf to the cookie-echo chunk
1439  */
1440 static struct sctp_tcb *
1441 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1442     struct sockaddr *src, struct sockaddr *dst,
1443     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1444     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1445     struct sockaddr *init_src, int *notification,
1446     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1447     uint8_t mflowtype, uint32_t mflowid,
1448     uint32_t vrf_id, uint16_t port)
1449 {
1450         struct sctp_association *asoc;
1451         struct sctp_init_chunk *init_cp, init_buf;
1452         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1453         struct sctp_nets *net;
1454         struct mbuf *op_err;
1455         int init_offset, initack_offset, i;
1456         int retval;
1457         int spec_flag = 0;
1458         uint32_t how_indx;
1459
1460 #if defined(SCTP_DETAILED_STR_STATS)
1461         int j;
1462
1463 #endif
1464
1465         net = *netp;
1466         /* I know that the TCB is non-NULL from the caller */
1467         asoc = &stcb->asoc;
1468         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1469                 if (asoc->cookie_how[how_indx] == 0)
1470                         break;
1471         }
1472         if (how_indx < sizeof(asoc->cookie_how)) {
1473                 asoc->cookie_how[how_indx] = 1;
1474         }
1475         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1476                 /* SHUTDOWN came in after sending INIT-ACK */
1477                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1478                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1479                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1480                     mflowtype, mflowid,
1481                     vrf_id, net->port);
1482                 if (how_indx < sizeof(asoc->cookie_how))
1483                         asoc->cookie_how[how_indx] = 2;
1484                 return (NULL);
1485         }
1486         /*
1487          * find and validate the INIT chunk in the cookie (peer's info) the
1488          * INIT should start after the cookie-echo header struct (chunk
1489          * header, state cookie header struct)
1490          */
1491         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1492
1493         init_cp = (struct sctp_init_chunk *)
1494             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1495             (uint8_t *) & init_buf);
1496         if (init_cp == NULL) {
1497                 /* could not pull a INIT chunk in cookie */
1498                 return (NULL);
1499         }
1500         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1501                 return (NULL);
1502         }
1503         /*
1504          * find and validate the INIT-ACK chunk in the cookie (my info) the
1505          * INIT-ACK follows the INIT chunk
1506          */
1507         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1508         initack_cp = (struct sctp_init_ack_chunk *)
1509             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1510             (uint8_t *) & initack_buf);
1511         if (initack_cp == NULL) {
1512                 /* could not pull INIT-ACK chunk in cookie */
1513                 return (NULL);
1514         }
1515         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1516                 return (NULL);
1517         }
1518         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1519             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1520                 /*
1521                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1522                  * to get into the OPEN state
1523                  */
1524                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1525                         /*-
1526                          * Opps, this means that we somehow generated two vtag's
1527                          * the same. I.e. we did:
1528                          *  Us               Peer
1529                          *   <---INIT(tag=a)------
1530                          *   ----INIT-ACK(tag=t)-->
1531                          *   ----INIT(tag=t)------> *1
1532                          *   <---INIT-ACK(tag=a)---
1533                          *   <----CE(tag=t)------------- *2
1534                          *
1535                          * At point *1 we should be generating a different
1536                          * tag t'. Which means we would throw away the CE and send
1537                          * ours instead. Basically this is case C (throw away side).
1538                          */
1539                         if (how_indx < sizeof(asoc->cookie_how))
1540                                 asoc->cookie_how[how_indx] = 17;
1541                         return (NULL);
1542
1543                 }
1544                 switch (SCTP_GET_STATE(asoc)) {
1545                 case SCTP_STATE_COOKIE_WAIT:
1546                 case SCTP_STATE_COOKIE_ECHOED:
1547                         /*
1548                          * INIT was sent but got a COOKIE_ECHO with the
1549                          * correct tags... just accept it...but we must
1550                          * process the init so that we can make sure we have
1551                          * the right seq no's.
1552                          */
1553                         /* First we must process the INIT !! */
1554                         retval = sctp_process_init(init_cp, stcb);
1555                         if (retval < 0) {
1556                                 if (how_indx < sizeof(asoc->cookie_how))
1557                                         asoc->cookie_how[how_indx] = 3;
1558                                 return (NULL);
1559                         }
1560                         /* we have already processed the INIT so no problem */
1561                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1562                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1563                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1564                         /* update current state */
1565                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1566                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1567                         else
1568                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1569
1570                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1571                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1572                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1573                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1574                         }
1575                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1576                         sctp_stop_all_cookie_timers(stcb);
1577                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1578                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1579                             (inp->sctp_socket->so_qlimit == 0)
1580                             ) {
1581 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1582                                 struct socket *so;
1583
1584 #endif
1585                                 /*
1586                                  * Here is where collision would go if we
1587                                  * did a connect() and instead got a
1588                                  * init/init-ack/cookie done before the
1589                                  * init-ack came back..
1590                                  */
1591                                 stcb->sctp_ep->sctp_flags |=
1592                                     SCTP_PCB_FLAGS_CONNECTED;
1593 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1594                                 so = SCTP_INP_SO(stcb->sctp_ep);
1595                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1596                                 SCTP_TCB_UNLOCK(stcb);
1597                                 SCTP_SOCKET_LOCK(so, 1);
1598                                 SCTP_TCB_LOCK(stcb);
1599                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1600                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1601                                         SCTP_SOCKET_UNLOCK(so, 1);
1602                                         return (NULL);
1603                                 }
1604 #endif
1605                                 soisconnected(stcb->sctp_socket);
1606 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1607                                 SCTP_SOCKET_UNLOCK(so, 1);
1608 #endif
1609                         }
1610                         /* notify upper layer */
1611                         *notification = SCTP_NOTIFY_ASSOC_UP;
1612                         /*
1613                          * since we did not send a HB make sure we don't
1614                          * double things
1615                          */
1616                         net->hb_responded = 1;
1617                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1618                             &cookie->time_entered,
1619                             sctp_align_unsafe_makecopy,
1620                             SCTP_RTT_FROM_NON_DATA);
1621
1622                         if (stcb->asoc.sctp_autoclose_ticks &&
1623                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1624                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1625                                     inp, stcb, NULL);
1626                         }
1627                         break;
1628                 default:
1629                         /*
1630                          * we're in the OPEN state (or beyond), so peer must
1631                          * have simply lost the COOKIE-ACK
1632                          */
1633                         break;
1634                 }               /* end switch */
1635                 sctp_stop_all_cookie_timers(stcb);
1636                 /*
1637                  * We ignore the return code here.. not sure if we should
1638                  * somehow abort.. but we do have an existing asoc. This
1639                  * really should not fail.
1640                  */
1641                 if (sctp_load_addresses_from_init(stcb, m,
1642                     init_offset + sizeof(struct sctp_init_chunk),
1643                     initack_offset, src, dst, init_src)) {
1644                         if (how_indx < sizeof(asoc->cookie_how))
1645                                 asoc->cookie_how[how_indx] = 4;
1646                         return (NULL);
1647                 }
1648                 /* respond with a COOKIE-ACK */
1649                 sctp_toss_old_cookies(stcb, asoc);
1650                 sctp_send_cookie_ack(stcb);
1651                 if (how_indx < sizeof(asoc->cookie_how))
1652                         asoc->cookie_how[how_indx] = 5;
1653                 return (stcb);
1654         }
1655         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1656             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1657             cookie->tie_tag_my_vtag == 0 &&
1658             cookie->tie_tag_peer_vtag == 0) {
1659                 /*
1660                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1661                  */
1662                 if (how_indx < sizeof(asoc->cookie_how))
1663                         asoc->cookie_how[how_indx] = 6;
1664                 return (NULL);
1665         }
1666         /*
1667          * If nat support, and the below and stcb is established, send back
1668          * a ABORT(colliding state) if we are established.
1669          */
1670         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1671             (asoc->peer_supports_nat) &&
1672             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1673             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1674             (asoc->peer_vtag == 0)))) {
1675                 /*
1676                  * Special case - Peer's support nat. We may have two init's
1677                  * that we gave out the same tag on since one was not
1678                  * established.. i.e. we get INIT from host-1 behind the nat
1679                  * and we respond tag-a, we get a INIT from host-2 behind
1680                  * the nat and we get tag-a again. Then we bring up host-1
1681                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1682                  * Now we have colliding state. We must send an abort here
1683                  * with colliding state indication.
1684                  */
1685                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1686                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1687                     mflowtype, mflowid,
1688                     vrf_id, port);
1689                 return (NULL);
1690         }
1691         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1692             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1693             (asoc->peer_vtag == 0))) {
1694                 /*
1695                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1696                  * should be ok, re-accept peer info
1697                  */
1698                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1699                         /*
1700                          * Extension of case C. If we hit this, then the
1701                          * random number generator returned the same vtag
1702                          * when we first sent our INIT-ACK and when we later
1703                          * sent our INIT. The side with the seq numbers that
1704                          * are different will be the one that normnally
1705                          * would have hit case C. This in effect "extends"
1706                          * our vtags in this collision case to be 64 bits.
1707                          * The same collision could occur aka you get both
1708                          * vtag and seq number the same twice in a row.. but
1709                          * is much less likely. If it did happen then we
1710                          * would proceed through and bring up the assoc.. we
1711                          * may end up with the wrong stream setup however..
1712                          * which would be bad.. but there is no way to
1713                          * tell.. until we send on a stream that does not
1714                          * exist :-)
1715                          */
1716                         if (how_indx < sizeof(asoc->cookie_how))
1717                                 asoc->cookie_how[how_indx] = 7;
1718
1719                         return (NULL);
1720                 }
1721                 if (how_indx < sizeof(asoc->cookie_how))
1722                         asoc->cookie_how[how_indx] = 8;
1723                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1724                 sctp_stop_all_cookie_timers(stcb);
1725                 /*
1726                  * since we did not send a HB make sure we don't double
1727                  * things
1728                  */
1729                 net->hb_responded = 1;
1730                 if (stcb->asoc.sctp_autoclose_ticks &&
1731                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1732                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1733                             NULL);
1734                 }
1735                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1736                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1737
1738                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1739                         /*
1740                          * Ok the peer probably discarded our data (if we
1741                          * echoed a cookie+data). So anything on the
1742                          * sent_queue should be marked for retransmit, we
1743                          * may not get something to kick us so it COULD
1744                          * still take a timeout to move these.. but it can't
1745                          * hurt to mark them.
1746                          */
1747                         struct sctp_tmit_chunk *chk;
1748
1749                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1750                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1751                                         chk->sent = SCTP_DATAGRAM_RESEND;
1752                                         sctp_flight_size_decrease(chk);
1753                                         sctp_total_flight_decrease(stcb, chk);
1754                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1755                                         spec_flag++;
1756                                 }
1757                         }
1758
1759                 }
1760                 /* process the INIT info (peer's info) */
1761                 retval = sctp_process_init(init_cp, stcb);
1762                 if (retval < 0) {
1763                         if (how_indx < sizeof(asoc->cookie_how))
1764                                 asoc->cookie_how[how_indx] = 9;
1765                         return (NULL);
1766                 }
1767                 if (sctp_load_addresses_from_init(stcb, m,
1768                     init_offset + sizeof(struct sctp_init_chunk),
1769                     initack_offset, src, dst, init_src)) {
1770                         if (how_indx < sizeof(asoc->cookie_how))
1771                                 asoc->cookie_how[how_indx] = 10;
1772                         return (NULL);
1773                 }
1774                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1775                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1776                         *notification = SCTP_NOTIFY_ASSOC_UP;
1777
1778                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1779                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1780                             (inp->sctp_socket->so_qlimit == 0)) {
1781 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1782                                 struct socket *so;
1783
1784 #endif
1785                                 stcb->sctp_ep->sctp_flags |=
1786                                     SCTP_PCB_FLAGS_CONNECTED;
1787 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1788                                 so = SCTP_INP_SO(stcb->sctp_ep);
1789                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1790                                 SCTP_TCB_UNLOCK(stcb);
1791                                 SCTP_SOCKET_LOCK(so, 1);
1792                                 SCTP_TCB_LOCK(stcb);
1793                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1794                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1795                                         SCTP_SOCKET_UNLOCK(so, 1);
1796                                         return (NULL);
1797                                 }
1798 #endif
1799                                 soisconnected(stcb->sctp_socket);
1800 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1801                                 SCTP_SOCKET_UNLOCK(so, 1);
1802 #endif
1803                         }
1804                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1805                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1806                         else
1807                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1808                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1809                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1810                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1811                 } else {
1812                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1813                 }
1814                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1815                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1816                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1817                             stcb->sctp_ep, stcb, asoc->primary_destination);
1818                 }
1819                 sctp_stop_all_cookie_timers(stcb);
1820                 sctp_toss_old_cookies(stcb, asoc);
1821                 sctp_send_cookie_ack(stcb);
1822                 if (spec_flag) {
1823                         /*
1824                          * only if we have retrans set do we do this. What
1825                          * this call does is get only the COOKIE-ACK out and
1826                          * then when we return the normal call to
1827                          * sctp_chunk_output will get the retrans out behind
1828                          * this.
1829                          */
1830                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1831                 }
1832                 if (how_indx < sizeof(asoc->cookie_how))
1833                         asoc->cookie_how[how_indx] = 11;
1834
1835                 return (stcb);
1836         }
1837         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1838             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1839             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1840             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1841             cookie->tie_tag_peer_vtag != 0) {
1842                 struct sctpasochead *head;
1843
1844 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1845                 struct socket *so;
1846
1847 #endif
1848
1849                 if (asoc->peer_supports_nat) {
1850                         /*
1851                          * This is a gross gross hack. Just call the
1852                          * cookie_new code since we are allowing a duplicate
1853                          * association. I hope this works...
1854                          */
1855                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1856                             sh, cookie, cookie_len,
1857                             inp, netp, init_src, notification,
1858                             auth_skipped, auth_offset, auth_len,
1859                             mflowtype, mflowid,
1860                             vrf_id, port));
1861                 }
1862                 /*
1863                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1864                  */
1865                 /* temp code */
1866                 if (how_indx < sizeof(asoc->cookie_how))
1867                         asoc->cookie_how[how_indx] = 12;
1868                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1869                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1870
1871                 /* notify upper layer */
1872                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1873                 atomic_add_int(&stcb->asoc.refcnt, 1);
1874                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1875                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1876                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1877                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1878                 }
1879                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1880                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1881                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1882                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1883                 }
1884                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1885                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1886                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1887                             stcb->sctp_ep, stcb, asoc->primary_destination);
1888
1889                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1890                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1891                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1892                 }
1893                 asoc->pre_open_streams =
1894                     ntohs(initack_cp->init.num_outbound_streams);
1895                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1896                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1897                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1898
1899                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1900
1901                 asoc->str_reset_seq_in = asoc->init_seq_number;
1902
1903                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1904                 if (asoc->mapping_array) {
1905                         memset(asoc->mapping_array, 0,
1906                             asoc->mapping_array_size);
1907                 }
1908                 if (asoc->nr_mapping_array) {
1909                         memset(asoc->nr_mapping_array, 0,
1910                             asoc->mapping_array_size);
1911                 }
1912                 SCTP_TCB_UNLOCK(stcb);
1913 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1914                 so = SCTP_INP_SO(stcb->sctp_ep);
1915                 SCTP_SOCKET_LOCK(so, 1);
1916 #endif
1917                 SCTP_INP_INFO_WLOCK();
1918                 SCTP_INP_WLOCK(stcb->sctp_ep);
1919                 SCTP_TCB_LOCK(stcb);
1920                 atomic_add_int(&stcb->asoc.refcnt, -1);
1921                 /* send up all the data */
1922                 SCTP_TCB_SEND_LOCK(stcb);
1923
1924                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1925                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1926                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1927 #if defined(SCTP_DETAILED_STR_STATS)
1928                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1929                                 asoc->strmout[i].abandoned_sent[j] = 0;
1930                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1931                         }
1932 #else
1933                         asoc->strmout[i].abandoned_sent[0] = 0;
1934                         asoc->strmout[i].abandoned_unsent[0] = 0;
1935 #endif
1936                         stcb->asoc.strmout[i].stream_no = i;
1937                         stcb->asoc.strmout[i].next_sequence_send = 0;
1938                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1939                 }
1940                 /* process the INIT-ACK info (my info) */
1941                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1942                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1943
1944                 /* pull from vtag hash */
1945                 LIST_REMOVE(stcb, sctp_asocs);
1946                 /* re-insert to new vtag position */
1947                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1948                     SCTP_BASE_INFO(hashasocmark))];
1949                 /*
1950                  * put it in the bucket in the vtag hash of assoc's for the
1951                  * system
1952                  */
1953                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1954
1955                 SCTP_TCB_SEND_UNLOCK(stcb);
1956                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1957                 SCTP_INP_INFO_WUNLOCK();
1958 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1959                 SCTP_SOCKET_UNLOCK(so, 1);
1960 #endif
1961                 asoc->total_flight = 0;
1962                 asoc->total_flight_count = 0;
1963                 /* process the INIT info (peer's info) */
1964                 retval = sctp_process_init(init_cp, stcb);
1965                 if (retval < 0) {
1966                         if (how_indx < sizeof(asoc->cookie_how))
1967                                 asoc->cookie_how[how_indx] = 13;
1968
1969                         return (NULL);
1970                 }
1971                 /*
1972                  * since we did not send a HB make sure we don't double
1973                  * things
1974                  */
1975                 net->hb_responded = 1;
1976
1977                 if (sctp_load_addresses_from_init(stcb, m,
1978                     init_offset + sizeof(struct sctp_init_chunk),
1979                     initack_offset, src, dst, init_src)) {
1980                         if (how_indx < sizeof(asoc->cookie_how))
1981                                 asoc->cookie_how[how_indx] = 14;
1982
1983                         return (NULL);
1984                 }
1985                 /* respond with a COOKIE-ACK */
1986                 sctp_stop_all_cookie_timers(stcb);
1987                 sctp_toss_old_cookies(stcb, asoc);
1988                 sctp_send_cookie_ack(stcb);
1989                 if (how_indx < sizeof(asoc->cookie_how))
1990                         asoc->cookie_how[how_indx] = 15;
1991
1992                 return (stcb);
1993         }
1994         if (how_indx < sizeof(asoc->cookie_how))
1995                 asoc->cookie_how[how_indx] = 16;
1996         /* all other cases... */
1997         return (NULL);
1998 }
1999
2000
2001 /*
2002  * handle a state cookie for a new association m: input packet mbuf chain--
2003  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2004  * and the cookie signature does not exist offset: offset into mbuf to the
2005  * cookie-echo chunk length: length of the cookie chunk to: where the init
2006  * was from returns a new TCB
2007  */
2008 static struct sctp_tcb *
2009 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2010     struct sockaddr *src, struct sockaddr *dst,
2011     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2012     struct sctp_inpcb *inp, struct sctp_nets **netp,
2013     struct sockaddr *init_src, int *notification,
2014     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2015     uint8_t mflowtype, uint32_t mflowid,
2016     uint32_t vrf_id, uint16_t port)
2017 {
2018         struct sctp_tcb *stcb;
2019         struct sctp_init_chunk *init_cp, init_buf;
2020         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2021         union sctp_sockstore store;
2022         struct sctp_association *asoc;
2023         int init_offset, initack_offset, initack_limit;
2024         int retval;
2025         int error = 0;
2026         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2027
2028 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2029         struct socket *so;
2030
2031         so = SCTP_INP_SO(inp);
2032 #endif
2033
2034         /*
2035          * find and validate the INIT chunk in the cookie (peer's info) the
2036          * INIT should start after the cookie-echo header struct (chunk
2037          * header, state cookie header struct)
2038          */
2039         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2040         init_cp = (struct sctp_init_chunk *)
2041             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2042             (uint8_t *) & init_buf);
2043         if (init_cp == NULL) {
2044                 /* could not pull a INIT chunk in cookie */
2045                 SCTPDBG(SCTP_DEBUG_INPUT1,
2046                     "process_cookie_new: could not pull INIT chunk hdr\n");
2047                 return (NULL);
2048         }
2049         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2050                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2051                 return (NULL);
2052         }
2053         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2054         /*
2055          * find and validate the INIT-ACK chunk in the cookie (my info) the
2056          * INIT-ACK follows the INIT chunk
2057          */
2058         initack_cp = (struct sctp_init_ack_chunk *)
2059             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2060             (uint8_t *) & initack_buf);
2061         if (initack_cp == NULL) {
2062                 /* could not pull INIT-ACK chunk in cookie */
2063                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2064                 return (NULL);
2065         }
2066         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2067                 return (NULL);
2068         }
2069         /*
2070          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2071          * "initack_limit" value.  This is because the chk_length field
2072          * includes the length of the cookie, but the cookie is omitted when
2073          * the INIT and INIT_ACK are tacked onto the cookie...
2074          */
2075         initack_limit = offset + cookie_len;
2076
2077         /*
2078          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2079          * and popluate
2080          */
2081
2082         /*
2083          * Here we do a trick, we set in NULL for the proc/thread argument.
2084          * We do this since in effect we only use the p argument when the
2085          * socket is unbound and we must do an implicit bind. Since we are
2086          * getting a cookie, we cannot be unbound.
2087          */
2088         stcb = sctp_aloc_assoc(inp, init_src, &error,
2089             ntohl(initack_cp->init.initiate_tag), vrf_id,
2090             (struct thread *)NULL
2091             );
2092         if (stcb == NULL) {
2093                 struct mbuf *op_err;
2094
2095                 /* memory problem? */
2096                 SCTPDBG(SCTP_DEBUG_INPUT1,
2097                     "process_cookie_new: no room for another TCB!\n");
2098                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2099                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2100                     src, dst, sh, op_err,
2101                     mflowtype, mflowid,
2102                     vrf_id, port);
2103                 return (NULL);
2104         }
2105         /* get the correct sctp_nets */
2106         if (netp)
2107                 *netp = sctp_findnet(stcb, init_src);
2108
2109         asoc = &stcb->asoc;
2110         /* get scope variables out of cookie */
2111         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2112         asoc->scope.site_scope = cookie->site_scope;
2113         asoc->scope.local_scope = cookie->local_scope;
2114         asoc->scope.loopback_scope = cookie->loopback_scope;
2115
2116         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2117             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2118                 struct mbuf *op_err;
2119
2120                 /*
2121                  * Houston we have a problem. The EP changed while the
2122                  * cookie was in flight. Only recourse is to abort the
2123                  * association.
2124                  */
2125                 atomic_add_int(&stcb->asoc.refcnt, 1);
2126                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2127                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2128                     src, dst, sh, op_err,
2129                     mflowtype, mflowid,
2130                     vrf_id, port);
2131 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2132                 SCTP_TCB_UNLOCK(stcb);
2133                 SCTP_SOCKET_LOCK(so, 1);
2134                 SCTP_TCB_LOCK(stcb);
2135 #endif
2136                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2137                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2138 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2139                 SCTP_SOCKET_UNLOCK(so, 1);
2140 #endif
2141                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2142                 return (NULL);
2143         }
2144         /* process the INIT-ACK info (my info) */
2145         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2146         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2147         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2148         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2149         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2150         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2151         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2152         asoc->str_reset_seq_in = asoc->init_seq_number;
2153
2154         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2155
2156         /* process the INIT info (peer's info) */
2157         if (netp)
2158                 retval = sctp_process_init(init_cp, stcb);
2159         else
2160                 retval = 0;
2161         if (retval < 0) {
2162                 atomic_add_int(&stcb->asoc.refcnt, 1);
2163 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2164                 SCTP_TCB_UNLOCK(stcb);
2165                 SCTP_SOCKET_LOCK(so, 1);
2166                 SCTP_TCB_LOCK(stcb);
2167 #endif
2168                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2169 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2170                 SCTP_SOCKET_UNLOCK(so, 1);
2171 #endif
2172                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2173                 return (NULL);
2174         }
2175         /* load all addresses */
2176         if (sctp_load_addresses_from_init(stcb, m,
2177             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2178             src, dst, init_src)) {
2179                 atomic_add_int(&stcb->asoc.refcnt, 1);
2180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2181                 SCTP_TCB_UNLOCK(stcb);
2182                 SCTP_SOCKET_LOCK(so, 1);
2183                 SCTP_TCB_LOCK(stcb);
2184 #endif
2185                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2186 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2187                 SCTP_SOCKET_UNLOCK(so, 1);
2188 #endif
2189                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2190                 return (NULL);
2191         }
2192         /*
2193          * verify any preceding AUTH chunk that was skipped
2194          */
2195         /* pull the local authentication parameters from the cookie/init-ack */
2196         sctp_auth_get_cookie_params(stcb, m,
2197             initack_offset + sizeof(struct sctp_init_ack_chunk),
2198             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2199         if (auth_skipped) {
2200                 struct sctp_auth_chunk *auth;
2201
2202                 auth = (struct sctp_auth_chunk *)
2203                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2204                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2205                         /* auth HMAC failed, dump the assoc and packet */
2206                         SCTPDBG(SCTP_DEBUG_AUTH1,
2207                             "COOKIE-ECHO: AUTH failed\n");
2208                         atomic_add_int(&stcb->asoc.refcnt, 1);
2209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2210                         SCTP_TCB_UNLOCK(stcb);
2211                         SCTP_SOCKET_LOCK(so, 1);
2212                         SCTP_TCB_LOCK(stcb);
2213 #endif
2214                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2215 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2216                         SCTP_SOCKET_UNLOCK(so, 1);
2217 #endif
2218                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2219                         return (NULL);
2220                 } else {
2221                         /* remaining chunks checked... good to go */
2222                         stcb->asoc.authenticated = 1;
2223                 }
2224         }
2225         /* update current state */
2226         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2227         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2228         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2229                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2230                     stcb->sctp_ep, stcb, asoc->primary_destination);
2231         }
2232         sctp_stop_all_cookie_timers(stcb);
2233         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2234         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2235
2236         /*
2237          * if we're doing ASCONFs, check to see if we have any new local
2238          * addresses that need to get added to the peer (eg. addresses
2239          * changed while cookie echo in flight).  This needs to be done
2240          * after we go to the OPEN state to do the correct asconf
2241          * processing. else, make sure we have the correct addresses in our
2242          * lists
2243          */
2244
2245         /* warning, we re-use sin, sin6, sa_store here! */
2246         /* pull in local_address (our "from" address) */
2247         switch (cookie->laddr_type) {
2248 #ifdef INET
2249         case SCTP_IPV4_ADDRESS:
2250                 /* source addr is IPv4 */
2251                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2252                 store.sin.sin_family = AF_INET;
2253                 store.sin.sin_len = sizeof(struct sockaddr_in);
2254                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2255                 break;
2256 #endif
2257 #ifdef INET6
2258         case SCTP_IPV6_ADDRESS:
2259                 /* source addr is IPv6 */
2260                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2261                 store.sin6.sin6_family = AF_INET6;
2262                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2263                 store.sin6.sin6_scope_id = cookie->scope_id;
2264                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2265                 break;
2266 #endif
2267         default:
2268                 atomic_add_int(&stcb->asoc.refcnt, 1);
2269 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2270                 SCTP_TCB_UNLOCK(stcb);
2271                 SCTP_SOCKET_LOCK(so, 1);
2272                 SCTP_TCB_LOCK(stcb);
2273 #endif
2274                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2275 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2276                 SCTP_SOCKET_UNLOCK(so, 1);
2277 #endif
2278                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2279                 return (NULL);
2280         }
2281
2282         /* set up to notify upper layer */
2283         *notification = SCTP_NOTIFY_ASSOC_UP;
2284         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2285             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2286             (inp->sctp_socket->so_qlimit == 0)) {
2287                 /*
2288                  * This is an endpoint that called connect() how it got a
2289                  * cookie that is NEW is a bit of a mystery. It must be that
2290                  * the INIT was sent, but before it got there.. a complete
2291                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2292                  * should have went to the other code.. not here.. oh well..
2293                  * a bit of protection is worth having..
2294                  */
2295                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2296 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2297                 atomic_add_int(&stcb->asoc.refcnt, 1);
2298                 SCTP_TCB_UNLOCK(stcb);
2299                 SCTP_SOCKET_LOCK(so, 1);
2300                 SCTP_TCB_LOCK(stcb);
2301                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2302                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2303                         SCTP_SOCKET_UNLOCK(so, 1);
2304                         return (NULL);
2305                 }
2306 #endif
2307                 soisconnected(stcb->sctp_socket);
2308 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2309                 SCTP_SOCKET_UNLOCK(so, 1);
2310 #endif
2311         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2312             (inp->sctp_socket->so_qlimit)) {
2313                 /*
2314                  * We don't want to do anything with this one. Since it is
2315                  * the listening guy. The timer will get started for
2316                  * accepted connections in the caller.
2317                  */
2318                 ;
2319         }
2320         /* since we did not send a HB make sure we don't double things */
2321         if ((netp) && (*netp))
2322                 (*netp)->hb_responded = 1;
2323
2324         if (stcb->asoc.sctp_autoclose_ticks &&
2325             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2326                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2327         }
2328         /* calculate the RTT */
2329         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2330         if ((netp) && (*netp)) {
2331                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2332                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2333                     SCTP_RTT_FROM_NON_DATA);
2334         }
2335         /* respond with a COOKIE-ACK */
2336         sctp_send_cookie_ack(stcb);
2337
2338         /*
2339          * check the address lists for any ASCONFs that need to be sent
2340          * AFTER the cookie-ack is sent
2341          */
2342         sctp_check_address_list(stcb, m,
2343             initack_offset + sizeof(struct sctp_init_ack_chunk),
2344             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2345             &store.sa, cookie->local_scope, cookie->site_scope,
2346             cookie->ipv4_scope, cookie->loopback_scope);
2347
2348
2349         return (stcb);
2350 }
2351
2352 /*
2353  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2354  * we NEED to make sure we are not already using the vtag. If so we
2355  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2356         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2357                                                             SCTP_BASE_INFO(hashasocmark))];
2358         LIST_FOREACH(stcb, head, sctp_asocs) {
2359                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2360                        -- SEND ABORT - TRY AGAIN --
2361                 }
2362         }
2363 */
2364
2365 /*
2366  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2367  * existing (non-NULL) TCB
2368  */
2369 static struct mbuf *
2370 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2371     struct sockaddr *src, struct sockaddr *dst,
2372     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2373     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2374     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2375     struct sctp_tcb **locked_tcb,
2376     uint8_t mflowtype, uint32_t mflowid,
2377     uint32_t vrf_id, uint16_t port)
2378 {
2379         struct sctp_state_cookie *cookie;
2380         struct sctp_tcb *l_stcb = *stcb;
2381         struct sctp_inpcb *l_inp;
2382         struct sockaddr *to;
2383         struct sctp_pcb *ep;
2384         struct mbuf *m_sig;
2385         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2386         uint8_t *sig;
2387         uint8_t cookie_ok = 0;
2388         unsigned int sig_offset, cookie_offset;
2389         unsigned int cookie_len;
2390         struct timeval now;
2391         struct timeval time_expires;
2392         int notification = 0;
2393         struct sctp_nets *netl;
2394         int had_a_existing_tcb = 0;
2395         int send_int_conf = 0;
2396
2397 #ifdef INET
2398         struct sockaddr_in sin;
2399
2400 #endif
2401 #ifdef INET6
2402         struct sockaddr_in6 sin6;
2403
2404 #endif
2405
2406         SCTPDBG(SCTP_DEBUG_INPUT2,
2407             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2408
2409         if (inp_p == NULL) {
2410                 return (NULL);
2411         }
2412         cookie = &cp->cookie;
2413         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2414         cookie_len = ntohs(cp->ch.chunk_length);
2415
2416         if ((cookie->peerport != sh->src_port) &&
2417             (cookie->myport != sh->dest_port) &&
2418             (cookie->my_vtag != sh->v_tag)) {
2419                 /*
2420                  * invalid ports or bad tag.  Note that we always leave the
2421                  * v_tag in the header in network order and when we stored
2422                  * it in the my_vtag slot we also left it in network order.
2423                  * This maintains the match even though it may be in the
2424                  * opposite byte order of the machine :->
2425                  */
2426                 return (NULL);
2427         }
2428         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2429             sizeof(struct sctp_init_chunk) +
2430             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2431                 /* cookie too small */
2432                 return (NULL);
2433         }
2434         /*
2435          * split off the signature into its own mbuf (since it should not be
2436          * calculated in the sctp_hmac_m() call).
2437          */
2438         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2439         m_sig = m_split(m, sig_offset, M_NOWAIT);
2440         if (m_sig == NULL) {
2441                 /* out of memory or ?? */
2442                 return (NULL);
2443         }
2444 #ifdef SCTP_MBUF_LOGGING
2445         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2446                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2447         }
2448 #endif
2449
2450         /*
2451          * compute the signature/digest for the cookie
2452          */
2453         ep = &(*inp_p)->sctp_ep;
2454         l_inp = *inp_p;
2455         if (l_stcb) {
2456                 SCTP_TCB_UNLOCK(l_stcb);
2457         }
2458         SCTP_INP_RLOCK(l_inp);
2459         if (l_stcb) {
2460                 SCTP_TCB_LOCK(l_stcb);
2461         }
2462         /* which cookie is it? */
2463         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2464             (ep->current_secret_number != ep->last_secret_number)) {
2465                 /* it's the old cookie */
2466                 (void)sctp_hmac_m(SCTP_HMAC,
2467                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2468                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2469         } else {
2470                 /* it's the current cookie */
2471                 (void)sctp_hmac_m(SCTP_HMAC,
2472                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2473                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2474         }
2475         /* get the signature */
2476         SCTP_INP_RUNLOCK(l_inp);
2477         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2478         if (sig == NULL) {
2479                 /* couldn't find signature */
2480                 sctp_m_freem(m_sig);
2481                 return (NULL);
2482         }
2483         /* compare the received digest with the computed digest */
2484         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2485                 /* try the old cookie? */
2486                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2487                     (ep->current_secret_number != ep->last_secret_number)) {
2488                         /* compute digest with old */
2489                         (void)sctp_hmac_m(SCTP_HMAC,
2490                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2491                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2492                         /* compare */
2493                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2494                                 cookie_ok = 1;
2495                 }
2496         } else {
2497                 cookie_ok = 1;
2498         }
2499
2500         /*
2501          * Now before we continue we must reconstruct our mbuf so that
2502          * normal processing of any other chunks will work.
2503          */
2504         {
2505                 struct mbuf *m_at;
2506
2507                 m_at = m;
2508                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2509                         m_at = SCTP_BUF_NEXT(m_at);
2510                 }
2511                 SCTP_BUF_NEXT(m_at) = m_sig;
2512         }
2513
2514         if (cookie_ok == 0) {
2515                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2516                 SCTPDBG(SCTP_DEBUG_INPUT2,
2517                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2518                     (uint32_t) offset, cookie_offset, sig_offset);
2519                 return (NULL);
2520         }
2521         /*
2522          * check the cookie timestamps to be sure it's not stale
2523          */
2524         (void)SCTP_GETTIME_TIMEVAL(&now);
2525         /* Expire time is in Ticks, so we convert to seconds */
2526         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2527         time_expires.tv_usec = cookie->time_entered.tv_usec;
2528         /*
2529          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2530          * is undefined.
2531          */
2532         if (timevalcmp(&now, &time_expires, >)) {
2533                 /* cookie is stale! */
2534                 struct mbuf *op_err;
2535                 struct sctp_stale_cookie_msg *scm;
2536                 uint32_t tim;
2537
2538                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2539                     0, M_NOWAIT, 1, MT_DATA);
2540                 if (op_err == NULL) {
2541                         /* FOOBAR */
2542                         return (NULL);
2543                 }
2544                 /* Set the len */
2545                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2546                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2547                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2548                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2549                     (sizeof(uint32_t))));
2550                 /* seconds to usec */
2551                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2552                 /* add in usec */
2553                 if (tim == 0)
2554                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2555                 scm->time_usec = htonl(tim);
2556                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2557                     mflowtype, mflowid,
2558                     vrf_id, port);
2559                 return (NULL);
2560         }
2561         /*
2562          * Now we must see with the lookup address if we have an existing
2563          * asoc. This will only happen if we were in the COOKIE-WAIT state
2564          * and a INIT collided with us and somewhere the peer sent the
2565          * cookie on another address besides the single address our assoc
2566          * had for him. In this case we will have one of the tie-tags set at
2567          * least AND the address field in the cookie can be used to look it
2568          * up.
2569          */
2570         to = NULL;
2571         switch (cookie->addr_type) {
2572 #ifdef INET6
2573         case SCTP_IPV6_ADDRESS:
2574                 memset(&sin6, 0, sizeof(sin6));
2575                 sin6.sin6_family = AF_INET6;
2576                 sin6.sin6_len = sizeof(sin6);
2577                 sin6.sin6_port = sh->src_port;
2578                 sin6.sin6_scope_id = cookie->scope_id;
2579                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2580                     sizeof(sin6.sin6_addr.s6_addr));
2581                 to = (struct sockaddr *)&sin6;
2582                 break;
2583 #endif
2584 #ifdef INET
2585         case SCTP_IPV4_ADDRESS:
2586                 memset(&sin, 0, sizeof(sin));
2587                 sin.sin_family = AF_INET;
2588                 sin.sin_len = sizeof(sin);
2589                 sin.sin_port = sh->src_port;
2590                 sin.sin_addr.s_addr = cookie->address[0];
2591                 to = (struct sockaddr *)&sin;
2592                 break;
2593 #endif
2594         default:
2595                 /* This should not happen */
2596                 return (NULL);
2597         }
2598         if (*stcb == NULL) {
2599                 /* Yep, lets check */
2600                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2601                 if (*stcb == NULL) {
2602                         /*
2603                          * We should have only got back the same inp. If we
2604                          * got back a different ep we have a problem. The
2605                          * original findep got back l_inp and now
2606                          */
2607                         if (l_inp != *inp_p) {
2608                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2609                         }
2610                 } else {
2611                         if (*locked_tcb == NULL) {
2612                                 /*
2613                                  * In this case we found the assoc only
2614                                  * after we locked the create lock. This
2615                                  * means we are in a colliding case and we
2616                                  * must make sure that we unlock the tcb if
2617                                  * its one of the cases where we throw away
2618                                  * the incoming packets.
2619                                  */
2620                                 *locked_tcb = *stcb;
2621
2622                                 /*
2623                                  * We must also increment the inp ref count
2624                                  * since the ref_count flags was set when we
2625                                  * did not find the TCB, now we found it
2626                                  * which reduces the refcount.. we must
2627                                  * raise it back out to balance it all :-)
2628                                  */
2629                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2630                                 if ((*stcb)->sctp_ep != l_inp) {
2631                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2632                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2633                                 }
2634                         }
2635                 }
2636         }
2637         cookie_len -= SCTP_SIGNATURE_SIZE;
2638         if (*stcb == NULL) {
2639                 /* this is the "normal" case... get a new TCB */
2640                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2641                     cookie, cookie_len, *inp_p,
2642                     netp, to, &notification,
2643                     auth_skipped, auth_offset, auth_len,
2644                     mflowtype, mflowid,
2645                     vrf_id, port);
2646         } else {
2647                 /* this is abnormal... cookie-echo on existing TCB */
2648                 had_a_existing_tcb = 1;
2649                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2650                     src, dst, sh,
2651                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2652                     &notification, auth_skipped, auth_offset, auth_len,
2653                     mflowtype, mflowid,
2654                     vrf_id, port);
2655         }
2656
2657         if (*stcb == NULL) {
2658                 /* still no TCB... must be bad cookie-echo */
2659                 return (NULL);
2660         }
2661         if ((*netp != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
2662                 (*netp)->flowtype = mflowtype;
2663         }
2664         /*
2665          * Ok, we built an association so confirm the address we sent the
2666          * INIT-ACK to.
2667          */
2668         netl = sctp_findnet(*stcb, to);
2669         /*
2670          * This code should in theory NOT run but
2671          */
2672         if (netl == NULL) {
2673                 /* TSNH! Huh, why do I need to add this address here? */
2674                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2675                         return (NULL);
2676                 }
2677                 netl = sctp_findnet(*stcb, to);
2678         }
2679         if (netl) {
2680                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2681                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2682                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2683                             netl);
2684                         send_int_conf = 1;
2685                 }
2686         }
2687         sctp_start_net_timers(*stcb);
2688         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2689                 if (!had_a_existing_tcb ||
2690                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2691                         /*
2692                          * If we have a NEW cookie or the connect never
2693                          * reached the connected state during collision we
2694                          * must do the TCP accept thing.
2695                          */
2696                         struct socket *so, *oso;
2697                         struct sctp_inpcb *inp;
2698
2699                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2700                                 /*
2701                                  * For a restart we will keep the same
2702                                  * socket, no need to do anything. I THINK!!
2703                                  */
2704                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2705                                 if (send_int_conf) {
2706                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2707                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2708                                 }
2709                                 return (m);
2710                         }
2711                         oso = (*inp_p)->sctp_socket;
2712                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2713                         SCTP_TCB_UNLOCK((*stcb));
2714                         CURVNET_SET(oso->so_vnet);
2715                         so = sonewconn(oso, 0
2716                             );
2717                         CURVNET_RESTORE();
2718                         SCTP_TCB_LOCK((*stcb));
2719                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2720
2721                         if (so == NULL) {
2722                                 struct mbuf *op_err;
2723
2724 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2725                                 struct socket *pcb_so;
2726
2727 #endif
2728                                 /* Too many sockets */
2729                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2730                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2731                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2732                                     src, dst, sh, op_err,
2733                                     mflowtype, mflowid,
2734                                     vrf_id, port);
2735 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2736                                 pcb_so = SCTP_INP_SO(*inp_p);
2737                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2738                                 SCTP_TCB_UNLOCK((*stcb));
2739                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2740                                 SCTP_TCB_LOCK((*stcb));
2741                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2742 #endif
2743                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2744 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2745                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2746 #endif
2747                                 return (NULL);
2748                         }
2749                         inp = (struct sctp_inpcb *)so->so_pcb;
2750                         SCTP_INP_INCR_REF(inp);
2751                         /*
2752                          * We add the unbound flag here so that if we get an
2753                          * soabort() before we get the move_pcb done, we
2754                          * will properly cleanup.
2755                          */
2756                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2757                             SCTP_PCB_FLAGS_CONNECTED |
2758                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2759                             SCTP_PCB_FLAGS_UNBOUND |
2760                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2761                             SCTP_PCB_FLAGS_DONT_WAKE);
2762                         inp->sctp_features = (*inp_p)->sctp_features;
2763                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2764                         inp->sctp_socket = so;
2765                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2766                         inp->max_cwnd = (*inp_p)->max_cwnd;
2767                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2768                         inp->ecn_supported = (*inp_p)->ecn_supported;
2769                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2770                         inp->auth_supported = (*inp_p)->auth_supported;
2771                         inp->asconf_supported = (*inp_p)->asconf_supported;
2772                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2773                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2774                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2775                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2776                         inp->sctp_context = (*inp_p)->sctp_context;
2777                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2778                         inp->inp_starting_point_for_iterator = NULL;
2779                         /*
2780                          * copy in the authentication parameters from the
2781                          * original endpoint
2782                          */
2783                         if (inp->sctp_ep.local_hmacs)
2784                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2785                         inp->sctp_ep.local_hmacs =
2786                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2787                         if (inp->sctp_ep.local_auth_chunks)
2788                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2789                         inp->sctp_ep.local_auth_chunks =
2790                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2791
2792                         /*
2793                          * Now we must move it from one hash table to
2794                          * another and get the tcb in the right place.
2795                          */
2796
2797                         /*
2798                          * This is where the one-2-one socket is put into
2799                          * the accept state waiting for the accept!
2800                          */
2801                         if (*stcb) {
2802                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2803                         }
2804                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2805
2806                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2807                         SCTP_TCB_UNLOCK((*stcb));
2808
2809                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2810                             0);
2811                         SCTP_TCB_LOCK((*stcb));
2812                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2813
2814
2815                         /*
2816                          * now we must check to see if we were aborted while
2817                          * the move was going on and the lock/unlock
2818                          * happened.
2819                          */
2820                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2821                                 /*
2822                                  * yep it was, we leave the assoc attached
2823                                  * to the socket since the sctp_inpcb_free()
2824                                  * call will send an abort for us.
2825                                  */
2826                                 SCTP_INP_DECR_REF(inp);
2827                                 return (NULL);
2828                         }
2829                         SCTP_INP_DECR_REF(inp);
2830                         /* Switch over to the new guy */
2831                         *inp_p = inp;
2832                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2833                         if (send_int_conf) {
2834                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2835                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2836                         }
2837                         /*
2838                          * Pull it from the incomplete queue and wake the
2839                          * guy
2840                          */
2841 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2842                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2843                         SCTP_TCB_UNLOCK((*stcb));
2844                         SCTP_SOCKET_LOCK(so, 1);
2845 #endif
2846                         soisconnected(so);
2847 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2848                         SCTP_TCB_LOCK((*stcb));
2849                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2850                         SCTP_SOCKET_UNLOCK(so, 1);
2851 #endif
2852                         return (m);
2853                 }
2854         }
2855         if (notification) {
2856                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2857         }
2858         if (send_int_conf) {
2859                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2860                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2861         }
2862         return (m);
2863 }
2864
2865 static void
2866 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2867     struct sctp_tcb *stcb, struct sctp_nets *net)
2868 {
2869         /* cp must not be used, others call this without a c-ack :-) */
2870         struct sctp_association *asoc;
2871
2872         SCTPDBG(SCTP_DEBUG_INPUT2,
2873             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2874         if ((stcb == NULL) || (net == NULL)) {
2875                 return;
2876         }
2877         asoc = &stcb->asoc;
2878
2879         sctp_stop_all_cookie_timers(stcb);
2880         /* process according to association state */
2881         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2882                 /* state change only needed when I am in right state */
2883                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2884                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2885                 sctp_start_net_timers(stcb);
2886                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2887                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2888                             stcb->sctp_ep, stcb, asoc->primary_destination);
2889
2890                 }
2891                 /* update RTO */
2892                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2893                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2894                 if (asoc->overall_error_count == 0) {
2895                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2896                             &asoc->time_entered, sctp_align_safe_nocopy,
2897                             SCTP_RTT_FROM_NON_DATA);
2898                 }
2899                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2900                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2901                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2902                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2903 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2904                         struct socket *so;
2905
2906 #endif
2907                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2908 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2909                         so = SCTP_INP_SO(stcb->sctp_ep);
2910                         atomic_add_int(&stcb->asoc.refcnt, 1);
2911                         SCTP_TCB_UNLOCK(stcb);
2912                         SCTP_SOCKET_LOCK(so, 1);
2913                         SCTP_TCB_LOCK(stcb);
2914                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2915 #endif
2916                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2917                                 soisconnected(stcb->sctp_socket);
2918                         }
2919 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2920                         SCTP_SOCKET_UNLOCK(so, 1);
2921 #endif
2922                 }
2923                 /*
2924                  * since we did not send a HB make sure we don't double
2925                  * things
2926                  */
2927                 net->hb_responded = 1;
2928
2929                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2930                         /*
2931                          * We don't need to do the asconf thing, nor hb or
2932                          * autoclose if the socket is closed.
2933                          */
2934                         goto closed_socket;
2935                 }
2936                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2937                     stcb, net);
2938
2939
2940                 if (stcb->asoc.sctp_autoclose_ticks &&
2941                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2942                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2943                             stcb->sctp_ep, stcb, NULL);
2944                 }
2945                 /*
2946                  * send ASCONF if parameters are pending and ASCONFs are
2947                  * allowed (eg. addresses changed when init/cookie echo were
2948                  * in flight)
2949                  */
2950                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2951                     (stcb->asoc.asconf_supported == 1) &&
2952                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2953 #ifdef SCTP_TIMER_BASED_ASCONF
2954                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2955                             stcb->sctp_ep, stcb,
2956                             stcb->asoc.primary_destination);
2957 #else
2958                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2959                             SCTP_ADDR_NOT_LOCKED);
2960 #endif
2961                 }
2962         }
2963 closed_socket:
2964         /* Toss the cookie if I can */
2965         sctp_toss_old_cookies(stcb, asoc);
2966         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2967                 /* Restart the timer if we have pending data */
2968                 struct sctp_tmit_chunk *chk;
2969
2970                 chk = TAILQ_FIRST(&asoc->sent_queue);
2971                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2972         }
2973 }
2974
2975 static void
2976 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2977     struct sctp_tcb *stcb)
2978 {
2979         struct sctp_nets *net;
2980         struct sctp_tmit_chunk *lchk;
2981         struct sctp_ecne_chunk bkup;
2982         uint8_t override_bit;
2983         uint32_t tsn, window_data_tsn;
2984         int len;
2985         unsigned int pkt_cnt;
2986
2987         len = ntohs(cp->ch.chunk_length);
2988         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2989             (len != sizeof(struct old_sctp_ecne_chunk))) {
2990                 return;
2991         }
2992         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2993                 /* Its the old format */
2994                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2995                 bkup.num_pkts_since_cwr = htonl(1);
2996                 cp = &bkup;
2997         }
2998         SCTP_STAT_INCR(sctps_recvecne);
2999         tsn = ntohl(cp->tsn);
3000         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3001         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3002         if (lchk == NULL) {
3003                 window_data_tsn = stcb->asoc.sending_seq - 1;
3004         } else {
3005                 window_data_tsn = lchk->rec.data.TSN_seq;
3006         }
3007
3008         /* Find where it was sent to if possible. */
3009         net = NULL;
3010         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3011                 if (lchk->rec.data.TSN_seq == tsn) {
3012                         net = lchk->whoTo;
3013                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3014                         break;
3015                 }
3016                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3017                         break;
3018                 }
3019         }
3020         if (net == NULL) {
3021                 /*
3022                  * What to do. A previous send of a CWR was possibly lost.
3023                  * See how old it is, we may have it marked on the actual
3024                  * net.
3025                  */
3026                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3027                         if (tsn == net->last_cwr_tsn) {
3028                                 /* Found him, send it off */
3029                                 break;
3030                         }
3031                 }
3032                 if (net == NULL) {
3033                         /*
3034                          * If we reach here, we need to send a special CWR
3035                          * that says hey, we did this a long time ago and
3036                          * you lost the response.
3037                          */
3038                         net = TAILQ_FIRST(&stcb->asoc.nets);
3039                         if (net == NULL) {
3040                                 /* TSNH */
3041                                 return;
3042                         }
3043                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3044                 } else {
3045                         override_bit = 0;
3046                 }
3047         } else {
3048                 override_bit = 0;
3049         }
3050         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3051             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3052                 /*
3053                  * JRS - Use the congestion control given in the pluggable
3054                  * CC module
3055                  */
3056                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3057                 /*
3058                  * We reduce once every RTT. So we will only lower cwnd at
3059                  * the next sending seq i.e. the window_data_tsn
3060                  */
3061                 net->cwr_window_tsn = window_data_tsn;
3062                 net->ecn_ce_pkt_cnt += pkt_cnt;
3063                 net->lost_cnt = pkt_cnt;
3064                 net->last_cwr_tsn = tsn;
3065         } else {
3066                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3067                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3068                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3069                         /*
3070                          * Another loss in the same window update how many
3071                          * marks/packets lost we have had.
3072                          */
3073                         int cnt = 1;
3074
3075                         if (pkt_cnt > net->lost_cnt) {
3076                                 /* Should be the case */
3077                                 cnt = (pkt_cnt - net->lost_cnt);
3078                                 net->ecn_ce_pkt_cnt += cnt;
3079                         }
3080                         net->lost_cnt = pkt_cnt;
3081                         net->last_cwr_tsn = tsn;
3082                         /*
3083                          * Most CC functions will ignore this call, since we
3084                          * are in-window yet of the initial CE the peer saw.
3085                          */
3086                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3087                 }
3088         }
3089         /*
3090          * We always send a CWR this way if our previous one was lost our
3091          * peer will get an update, or if it is not time again to reduce we
3092          * still get the cwr to the peer. Note we set the override when we
3093          * could not find the TSN on the chunk or the destination network.
3094          */
3095         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3096 }
3097
3098 static void
3099 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3100 {
3101         /*
3102          * Here we get a CWR from the peer. We must look in the outqueue and
3103          * make sure that we have a covered ECNE in the control chunk part.
3104          * If so remove it.
3105          */
3106         struct sctp_tmit_chunk *chk;
3107         struct sctp_ecne_chunk *ecne;
3108         int override;
3109         uint32_t cwr_tsn;
3110
3111         cwr_tsn = ntohl(cp->tsn);
3112         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3113         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3114                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3115                         continue;
3116                 }
3117                 if ((override == 0) && (chk->whoTo != net)) {
3118                         /* Must be from the right src unless override is set */
3119                         continue;
3120                 }
3121                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3122                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3123                         /* this covers this ECNE, we can remove it */
3124                         stcb->asoc.ecn_echo_cnt_onq--;
3125                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3126                             sctp_next);
3127                         sctp_m_freem(chk->data);
3128                         chk->data = NULL;
3129                         stcb->asoc.ctrl_queue_cnt--;
3130                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3131                         if (override == 0) {
3132                                 break;
3133                         }
3134                 }
3135         }
3136 }
3137
3138 static void
3139 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3140     struct sctp_tcb *stcb, struct sctp_nets *net)
3141 {
3142         struct sctp_association *asoc;
3143
3144 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3145         struct socket *so;
3146
3147 #endif
3148
3149         SCTPDBG(SCTP_DEBUG_INPUT2,
3150             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3151         if (stcb == NULL)
3152                 return;
3153
3154         asoc = &stcb->asoc;
3155         /* process according to association state */
3156         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3157                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3158                 SCTPDBG(SCTP_DEBUG_INPUT2,
3159                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3160                 SCTP_TCB_UNLOCK(stcb);
3161                 return;
3162         }
3163         /* notify upper layer protocol */
3164         if (stcb->sctp_socket) {
3165                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3166         }
3167 #ifdef INVARIANTS
3168         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3169             !TAILQ_EMPTY(&asoc->sent_queue) ||
3170             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3171                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3172         }
3173 #endif
3174         /* stop the timer */
3175         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3176         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3177         /* free the TCB */
3178         SCTPDBG(SCTP_DEBUG_INPUT2,
3179             "sctp_handle_shutdown_complete: calls free-asoc\n");
3180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3181         so = SCTP_INP_SO(stcb->sctp_ep);
3182         atomic_add_int(&stcb->asoc.refcnt, 1);
3183         SCTP_TCB_UNLOCK(stcb);
3184         SCTP_SOCKET_LOCK(so, 1);
3185         SCTP_TCB_LOCK(stcb);
3186         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3187 #endif
3188         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3189 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3190         SCTP_SOCKET_UNLOCK(so, 1);
3191 #endif
3192         return;
3193 }
3194
3195 static int
3196 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3197     struct sctp_nets *net, uint8_t flg)
3198 {
3199         switch (desc->chunk_type) {
3200         case SCTP_DATA:
3201                 /* find the tsn to resend (possibly */
3202                 {
3203                         uint32_t tsn;
3204                         struct sctp_tmit_chunk *tp1;
3205
3206                         tsn = ntohl(desc->tsn_ifany);
3207                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3208                                 if (tp1->rec.data.TSN_seq == tsn) {
3209                                         /* found it */
3210                                         break;
3211                                 }
3212                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3213                                         /* not found */
3214                                         tp1 = NULL;
3215                                         break;
3216                                 }
3217                         }
3218                         if (tp1 == NULL) {
3219                                 /*
3220                                  * Do it the other way , aka without paying
3221                                  * attention to queue seq order.
3222                                  */
3223                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3224                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3225                                         if (tp1->rec.data.TSN_seq == tsn) {
3226                                                 /* found it */
3227                                                 break;
3228                                         }
3229                                 }
3230                         }
3231                         if (tp1 == NULL) {
3232                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3233                         }
3234                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3235                                 uint8_t *ddp;
3236
3237                                 if (((flg & SCTP_BADCRC) == 0) &&
3238                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3239                                         return (0);
3240                                 }
3241                                 if ((stcb->asoc.peers_rwnd == 0) &&
3242                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3243                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3244                                         return (0);
3245                                 }
3246                                 if (stcb->asoc.peers_rwnd == 0 &&
3247                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3248                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3249                                         return (0);
3250                                 }
3251                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3252                                     sizeof(struct sctp_data_chunk));
3253                                 {
3254                                         unsigned int iii;
3255
3256                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3257                                             iii++) {
3258                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3259                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3260                                                         return (-1);
3261                                                 }
3262                                         }
3263                                 }
3264
3265                                 if (tp1->do_rtt) {
3266                                         /*
3267                                          * this guy had a RTO calculation
3268                                          * pending on it, cancel it
3269                                          */
3270                                         if (tp1->whoTo->rto_needed == 0) {
3271                                                 tp1->whoTo->rto_needed = 1;
3272                                         }
3273                                         tp1->do_rtt = 0;
3274                                 }
3275                                 SCTP_STAT_INCR(sctps_pdrpmark);
3276                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3277                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3278                                 /*
3279                                  * mark it as if we were doing a FR, since
3280                                  * we will be getting gap ack reports behind
3281                                  * the info from the router.
3282                                  */
3283                                 tp1->rec.data.doing_fast_retransmit = 1;
3284                                 /*
3285                                  * mark the tsn with what sequences can
3286                                  * cause a new FR.
3287                                  */
3288                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3289                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3290                                 } else {
3291                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3292                                 }
3293
3294                                 /* restart the timer */
3295                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3296                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3297                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3298                                     stcb, tp1->whoTo);
3299
3300                                 /* fix counts and things */
3301                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3302                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3303                                             tp1->whoTo->flight_size,
3304                                             tp1->book_size,
3305                                             (uintptr_t) stcb,
3306                                             tp1->rec.data.TSN_seq);
3307                                 }
3308                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3309                                         sctp_flight_size_decrease(tp1);
3310                                         sctp_total_flight_decrease(stcb, tp1);
3311                                 }
3312                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3313                         } {
3314                                 /* audit code */
3315                                 unsigned int audit;
3316
3317                                 audit = 0;
3318                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3319                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3320                                                 audit++;
3321                                 }
3322                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3323                                     sctp_next) {
3324                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3325                                                 audit++;
3326                                 }
3327                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3328                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3329                                             audit, stcb->asoc.sent_queue_retran_cnt);
3330 #ifndef SCTP_AUDITING_ENABLED
3331                                         stcb->asoc.sent_queue_retran_cnt = audit;
3332 #endif
3333                                 }
3334                         }
3335                 }
3336                 break;
3337         case SCTP_ASCONF:
3338                 {
3339                         struct sctp_tmit_chunk *asconf;
3340
3341                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3342                             sctp_next) {
3343                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3344                                         break;
3345                                 }
3346                         }
3347                         if (asconf) {
3348                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3349                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3350                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3351                                 asconf->snd_count--;
3352                         }
3353                 }
3354                 break;
3355         case SCTP_INITIATION:
3356                 /* resend the INIT */
3357                 stcb->asoc.dropped_special_cnt++;
3358                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3359                         /*
3360                          * If we can get it in, in a few attempts we do
3361                          * this, otherwise we let the timer fire.
3362                          */
3363                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3364                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3365                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3366                 }
3367                 break;
3368         case SCTP_SELECTIVE_ACK:
3369         case SCTP_NR_SELECTIVE_ACK:
3370                 /* resend the sack */
3371                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3372                 break;
3373         case SCTP_HEARTBEAT_REQUEST:
3374                 /* resend a demand HB */
3375                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3376                         /*
3377                          * Only retransmit if we KNOW we wont destroy the
3378                          * tcb
3379                          */
3380                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3381                 }
3382                 break;
3383         case SCTP_SHUTDOWN:
3384                 sctp_send_shutdown(stcb, net);
3385                 break;
3386         case SCTP_SHUTDOWN_ACK:
3387                 sctp_send_shutdown_ack(stcb, net);
3388                 break;
3389         case SCTP_COOKIE_ECHO:
3390                 {
3391                         struct sctp_tmit_chunk *cookie;
3392
3393                         cookie = NULL;
3394                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3395                             sctp_next) {
3396                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3397                                         break;
3398                                 }
3399                         }
3400                         if (cookie) {
3401                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3402                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3403                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3404                                 sctp_stop_all_cookie_timers(stcb);
3405                         }
3406                 }
3407                 break;
3408         case SCTP_COOKIE_ACK:
3409                 sctp_send_cookie_ack(stcb);
3410                 break;
3411         case SCTP_ASCONF_ACK:
3412                 /* resend last asconf ack */
3413                 sctp_send_asconf_ack(stcb);
3414                 break;
3415         case SCTP_FORWARD_CUM_TSN:
3416                 send_forward_tsn(stcb, &stcb->asoc);
3417                 break;
3418                 /* can't do anything with these */
3419         case SCTP_PACKET_DROPPED:
3420         case SCTP_INITIATION_ACK:       /* this should not happen */
3421         case SCTP_HEARTBEAT_ACK:
3422         case SCTP_ABORT_ASSOCIATION:
3423         case SCTP_OPERATION_ERROR:
3424         case SCTP_SHUTDOWN_COMPLETE:
3425         case SCTP_ECN_ECHO:
3426         case SCTP_ECN_CWR:
3427         default:
3428                 break;
3429         }
3430         return (0);
3431 }
3432
3433 void
3434 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3435 {
3436         uint32_t i;
3437         uint16_t temp;
3438
3439         /*
3440          * We set things to 0xffff since this is the last delivered sequence
3441          * and we will be sending in 0 after the reset.
3442          */
3443
3444         if (number_entries) {
3445                 for (i = 0; i < number_entries; i++) {
3446                         temp = ntohs(list[i]);
3447                         if (temp >= stcb->asoc.streamincnt) {
3448                                 continue;
3449                         }
3450                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3451                 }
3452         } else {
3453                 list = NULL;
3454                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3455                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3456                 }
3457         }
3458         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3459 }
3460
3461 static void
3462 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3463 {
3464         uint32_t i;
3465         uint16_t temp;
3466
3467         if (number_entries > 0) {
3468                 for (i = 0; i < number_entries; i++) {
3469                         temp = ntohs(list[i]);
3470                         if (temp >= stcb->asoc.streamoutcnt) {
3471                                 /* no such stream */
3472                                 continue;
3473                         }
3474                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3475                 }
3476         } else {
3477                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3478                         stcb->asoc.strmout[i].next_sequence_send = 0;
3479                 }
3480         }
3481         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3482 }
3483
3484
3485 struct sctp_stream_reset_request *
3486 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3487 {
3488         struct sctp_association *asoc;
3489         struct sctp_chunkhdr *ch;
3490         struct sctp_stream_reset_request *r;
3491         struct sctp_tmit_chunk *chk;
3492         int len, clen;
3493
3494         asoc = &stcb->asoc;
3495         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3496                 asoc->stream_reset_outstanding = 0;
3497                 return (NULL);
3498         }
3499         if (stcb->asoc.str_reset == NULL) {
3500                 asoc->stream_reset_outstanding = 0;
3501                 return (NULL);
3502         }
3503         chk = stcb->asoc.str_reset;
3504         if (chk->data == NULL) {
3505                 return (NULL);
3506         }
3507         if (bchk) {
3508                 /* he wants a copy of the chk pointer */
3509                 *bchk = chk;
3510         }
3511         clen = chk->send_size;
3512         ch = mtod(chk->data, struct sctp_chunkhdr *);
3513         r = (struct sctp_stream_reset_request *)(ch + 1);
3514         if (ntohl(r->request_seq) == seq) {
3515                 /* found it */
3516                 return (r);
3517         }
3518         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3519         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3520                 /* move to the next one, there can only be a max of two */
3521                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3522                 if (ntohl(r->request_seq) == seq) {
3523                         return (r);
3524                 }
3525         }
3526         /* that seq is not here */
3527         return (NULL);
3528 }
3529
3530 static void
3531 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3532 {
3533         struct sctp_association *asoc;
3534         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3535
3536         if (stcb->asoc.str_reset == NULL) {
3537                 return;
3538         }
3539         asoc = &stcb->asoc;
3540
3541         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3542         TAILQ_REMOVE(&asoc->control_send_queue,
3543             chk,
3544             sctp_next);
3545         if (chk->data) {
3546                 sctp_m_freem(chk->data);
3547                 chk->data = NULL;
3548         }
3549         asoc->ctrl_queue_cnt--;
3550         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3551         /* sa_ignore NO_NULL_CHK */
3552         stcb->asoc.str_reset = NULL;
3553 }
3554
3555
3556 static int
3557 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3558     uint32_t seq, uint32_t action,
3559     struct sctp_stream_reset_response *respin)
3560 {
3561         uint16_t type;
3562         int lparm_len;
3563         struct sctp_association *asoc = &stcb->asoc;
3564         struct sctp_tmit_chunk *chk;
3565         struct sctp_stream_reset_request *req_param;
3566         struct sctp_stream_reset_out_request *req_out_param;
3567         struct sctp_stream_reset_in_request *req_in_param;
3568         uint32_t number_entries;
3569
3570         if (asoc->stream_reset_outstanding == 0) {
3571                 /* duplicate */
3572                 return (0);
3573         }
3574         if (seq == stcb->asoc.str_reset_seq_out) {
3575                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3576                 if (req_param != NULL) {
3577                         stcb->asoc.str_reset_seq_out++;
3578                         type = ntohs(req_param->ph.param_type);
3579                         lparm_len = ntohs(req_param->ph.param_length);
3580                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3581                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3582                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3583                                 asoc->stream_reset_out_is_outstanding = 0;
3584                                 if (asoc->stream_reset_outstanding)
3585                                         asoc->stream_reset_outstanding--;
3586                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3587                                         /* do it */
3588                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3589                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3590                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3591                                 } else {
3592                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3593                                 }
3594                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3595                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3596                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3597                                 if (asoc->stream_reset_outstanding)
3598                                         asoc->stream_reset_outstanding--;
3599                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3600                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3601                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3602                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3603                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3604                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3605                                 }
3606                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3607                                 /* Ok we now may have more streams */
3608                                 int num_stream;
3609
3610                                 num_stream = stcb->asoc.strm_pending_add_size;
3611                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3612                                         /* TSNH */
3613                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3614                                 }
3615                                 stcb->asoc.strm_pending_add_size = 0;
3616                                 if (asoc->stream_reset_outstanding)
3617                                         asoc->stream_reset_outstanding--;
3618                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3619                                         /* Put the new streams into effect */
3620                                         stcb->asoc.streamoutcnt += num_stream;
3621                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3622                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3623                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3624                                             SCTP_STREAM_CHANGE_DENIED);
3625                                 } else {
3626                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3627                                             SCTP_STREAM_CHANGE_FAILED);
3628                                 }
3629                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3630                                 if (asoc->stream_reset_outstanding)
3631                                         asoc->stream_reset_outstanding--;
3632                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3633                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3634                                             SCTP_STREAM_CHANGE_DENIED);
3635                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3636                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3637                                             SCTP_STREAM_CHANGE_FAILED);
3638                                 }
3639                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3640                                 /**
3641                                  * a) Adopt the new in tsn.
3642                                  * b) reset the map
3643                                  * c) Adopt the new out-tsn
3644                                  */
3645                                 struct sctp_stream_reset_response_tsn *resp;
3646                                 struct sctp_forward_tsn_chunk fwdtsn;
3647                                 int abort_flag = 0;
3648
3649                                 if (respin == NULL) {
3650                                         /* huh ? */
3651                                         return (0);
3652                                 }
3653                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3654                                         return (0);
3655                                 }
3656                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3657                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3658                                         asoc->stream_reset_outstanding--;
3659                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3660                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3661                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3662                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3663                                         if (abort_flag) {
3664                                                 return (1);
3665                                         }
3666                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3667                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3668                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3669                                         }
3670                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3671                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3672                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3673
3674                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3675                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3676
3677                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3678                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3679
3680                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3681                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3682                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3683                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3684                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3685                                             SCTP_ASSOC_RESET_DENIED);
3686                                 } else {
3687                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3688                                             SCTP_ASSOC_RESET_FAILED);
3689                                 }
3690                         }
3691                         /* get rid of the request and get the request flags */
3692                         if (asoc->stream_reset_outstanding == 0) {
3693                                 sctp_clean_up_stream_reset(stcb);
3694                         }
3695                 }
3696         }
3697         return (0);
3698 }
3699
3700 static void
3701 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3702     struct sctp_tmit_chunk *chk,
3703     struct sctp_stream_reset_in_request *req, int trunc)
3704 {
3705         uint32_t seq;
3706         int len, i;
3707         int number_entries;
3708         uint16_t temp;
3709
3710         /*
3711          * peer wants me to send a str-reset to him for my outgoing seq's if
3712          * seq_in is right.
3713          */
3714         struct sctp_association *asoc = &stcb->asoc;
3715
3716         seq = ntohl(req->request_seq);
3717         if (asoc->str_reset_seq_in == seq) {
3718                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3719                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3720                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3721                 } else if (trunc) {
3722                         /* Can't do it, since they exceeded our buffer size  */
3723                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3724                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3725                         len = ntohs(req->ph.param_length);
3726                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3727                         for (i = 0; i < number_entries; i++) {
3728                                 temp = ntohs(req->list_of_streams[i]);
3729                                 req->list_of_streams[i] = temp;
3730                         }
3731                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3732                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3733                             asoc->str_reset_seq_out,
3734                             seq, (asoc->sending_seq - 1));
3735                         asoc->stream_reset_out_is_outstanding = 1;
3736                         asoc->str_reset = chk;
3737                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3738                         stcb->asoc.stream_reset_outstanding++;
3739                 } else {
3740                         /* Can't do it, since we have sent one out */
3741                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3742                 }
3743                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3744                 asoc->str_reset_seq_in++;
3745         } else if (asoc->str_reset_seq_in - 1 == seq) {
3746                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3747         } else if (asoc->str_reset_seq_in - 2 == seq) {
3748                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3749         } else {
3750                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3751         }
3752 }
3753
3754 static int
3755 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3756     struct sctp_tmit_chunk *chk,
3757     struct sctp_stream_reset_tsn_request *req)
3758 {
3759         /* reset all in and out and update the tsn */
3760         /*
3761          * A) reset my str-seq's on in and out. B) Select a receive next,
3762          * and set cum-ack to it. Also process this selected number as a
3763          * fwd-tsn as well. C) set in the response my next sending seq.
3764          */
3765         struct sctp_forward_tsn_chunk fwdtsn;
3766         struct sctp_association *asoc = &stcb->asoc;
3767         int abort_flag = 0;
3768         uint32_t seq;
3769
3770         seq = ntohl(req->request_seq);
3771         if (asoc->str_reset_seq_in == seq) {
3772                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3773                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3774                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3775                 } else {
3776                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3777                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3778                         fwdtsn.ch.chunk_flags = 0;
3779                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3780                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3781                         if (abort_flag) {
3782                                 return (1);
3783                         }
3784                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3785                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3786                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3787                         }
3788                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3789                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3790                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3791                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3792                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3793                         atomic_add_int(&asoc->sending_seq, 1);
3794                         /* save off historical data for retrans */
3795                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3796                         asoc->last_sending_seq[0] = asoc->sending_seq;
3797                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3798                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3799                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3800                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3801                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3802                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3803                 }
3804                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3805                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3806                 asoc->str_reset_seq_in++;
3807         } else if (asoc->str_reset_seq_in - 1 == seq) {
3808                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3809                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3810         } else if (asoc->str_reset_seq_in - 2 == seq) {
3811                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3812                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3813         } else {
3814                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3815         }
3816         return (0);
3817 }
3818
3819 static void
3820 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3821     struct sctp_tmit_chunk *chk,
3822     struct sctp_stream_reset_out_request *req, int trunc)
3823 {
3824         uint32_t seq, tsn;
3825         int number_entries, len;
3826         struct sctp_association *asoc = &stcb->asoc;
3827
3828         seq = ntohl(req->request_seq);
3829
3830         /* now if its not a duplicate we process it */
3831         if (asoc->str_reset_seq_in == seq) {
3832                 len = ntohs(req->ph.param_length);
3833                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3834                 /*
3835                  * the sender is resetting, handle the list issue.. we must
3836                  * a) verify if we can do the reset, if so no problem b) If
3837                  * we can't do the reset we must copy the request. c) queue
3838                  * it, and setup the data in processor to trigger it off
3839                  * when needed and dequeue all the queued data.
3840                  */
3841                 tsn = ntohl(req->send_reset_at_tsn);
3842
3843                 /* move the reset action back one */
3844                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3845                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3846                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3847                 } else if (trunc) {
3848                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3849                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3850                         /* we can do it now */
3851                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3852                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3853                 } else {
3854                         /*
3855                          * we must queue it up and thus wait for the TSN's
3856                          * to arrive that are at or before tsn
3857                          */
3858                         struct sctp_stream_reset_list *liste;
3859                         int siz;
3860
3861                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3862                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3863                             siz, SCTP_M_STRESET);
3864                         if (liste == NULL) {
3865                                 /* gak out of memory */
3866                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3867                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3868                                 return;
3869                         }
3870                         liste->tsn = tsn;
3871                         liste->number_entries = number_entries;
3872                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3873                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3874                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3875                 }
3876                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3877                 asoc->str_reset_seq_in++;
3878         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3879                 /*
3880                  * one seq back, just echo back last action since my
3881                  * response was lost.
3882                  */
3883                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3884         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3885                 /*
3886                  * two seq back, just echo back last action since my
3887                  * response was lost.
3888                  */
3889                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3890         } else {
3891                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3892         }
3893 }
3894
3895 static void
3896 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3897     struct sctp_stream_reset_add_strm *str_add)
3898 {
3899         /*
3900          * Peer is requesting to add more streams. If its within our
3901          * max-streams we will allow it.
3902          */
3903         uint32_t num_stream, i;
3904         uint32_t seq;
3905         struct sctp_association *asoc = &stcb->asoc;
3906         struct sctp_queued_to_read *ctl, *nctl;
3907
3908         /* Get the number. */
3909         seq = ntohl(str_add->request_seq);
3910         num_stream = ntohs(str_add->number_of_streams);
3911         /* Now what would be the new total? */
3912         if (asoc->str_reset_seq_in == seq) {
3913                 num_stream += stcb->asoc.streamincnt;
3914                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3915                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3916                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3917                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3918                     (num_stream > 0xffff)) {
3919                         /* We must reject it they ask for to many */
3920         denied:
3921                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3922                 } else {
3923                         /* Ok, we can do that :-) */
3924                         struct sctp_stream_in *oldstrm;
3925
3926                         /* save off the old */
3927                         oldstrm = stcb->asoc.strmin;
3928                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3929                             (num_stream * sizeof(struct sctp_stream_in)),
3930                             SCTP_M_STRMI);
3931                         if (stcb->asoc.strmin == NULL) {
3932                                 stcb->asoc.strmin = oldstrm;
3933                                 goto denied;
3934                         }
3935                         /* copy off the old data */
3936                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3937                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3938                                 stcb->asoc.strmin[i].stream_no = i;
3939                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3940                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3941                                 /* now anything on those queues? */
3942                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3943                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3944                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3945                                 }
3946                         }
3947                         /* Init the new streams */
3948                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3949                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3950                                 stcb->asoc.strmin[i].stream_no = i;
3951                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3952                                 stcb->asoc.strmin[i].delivery_started = 0;
3953                         }
3954                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3955                         /* update the size */
3956                         stcb->asoc.streamincnt = num_stream;
3957                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3958                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3959                 }
3960                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3961                 asoc->str_reset_seq_in++;
3962         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3963                 /*
3964                  * one seq back, just echo back last action since my
3965                  * response was lost.
3966                  */
3967                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3968         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3969                 /*
3970                  * two seq back, just echo back last action since my
3971                  * response was lost.
3972                  */
3973                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3974         } else {
3975                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3976
3977         }
3978 }
3979
3980 static void
3981 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3982     struct sctp_stream_reset_add_strm *str_add)
3983 {
3984         /*
3985          * Peer is requesting to add more streams. If its within our
3986          * max-streams we will allow it.
3987          */
3988         uint16_t num_stream;
3989         uint32_t seq;
3990         struct sctp_association *asoc = &stcb->asoc;
3991
3992         /* Get the number. */
3993         seq = ntohl(str_add->request_seq);
3994         num_stream = ntohs(str_add->number_of_streams);
3995         /* Now what would be the new total? */
3996         if (asoc->str_reset_seq_in == seq) {
3997                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3998                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3999                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4000                 } else if (stcb->asoc.stream_reset_outstanding) {
4001                         /* We must reject it we have something pending */
4002                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4003                 } else {
4004                         /* Ok, we can do that :-) */
4005                         int mychk;
4006
4007                         mychk = stcb->asoc.streamoutcnt;
4008                         mychk += num_stream;
4009                         if (mychk < 0x10000) {
4010                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4011                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4012                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4013                                 }
4014                         } else {
4015                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4016                         }
4017                 }
4018                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4019                 asoc->str_reset_seq_in++;
4020         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4021                 /*
4022                  * one seq back, just echo back last action since my
4023                  * response was lost.
4024                  */
4025                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4026         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4027                 /*
4028                  * two seq back, just echo back last action since my
4029                  * response was lost.
4030                  */
4031                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4032         } else {
4033                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4034         }
4035 }
4036
4037 #ifdef __GNUC__
4038 __attribute__((noinline))
4039 #endif
4040         static int
4041             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4042         struct sctp_chunkhdr *ch_req)
4043 {
4044         uint16_t remaining_length, param_len, ptype;
4045         struct sctp_paramhdr pstore;
4046         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4047         uint32_t seq = 0;
4048         int num_req = 0;
4049         int trunc = 0;
4050         struct sctp_tmit_chunk *chk;
4051         struct sctp_chunkhdr *ch;
4052         struct sctp_paramhdr *ph;
4053         int ret_code = 0;
4054         int num_param = 0;
4055
4056         /* now it may be a reset or a reset-response */
4057         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4058
4059         /* setup for adding the response */
4060         sctp_alloc_a_chunk(stcb, chk);
4061         if (chk == NULL) {
4062                 return (ret_code);
4063         }
4064         chk->copy_by_ref = 0;
4065         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4066         chk->rec.chunk_id.can_take_data = 0;
4067         chk->flags = 0;
4068         chk->asoc = &stcb->asoc;
4069         chk->no_fr_allowed = 0;
4070         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4071         chk->book_size_scale = 0;
4072         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4073         if (chk->data == NULL) {
4074 strres_nochunk:
4075                 if (chk->data) {
4076                         sctp_m_freem(chk->data);
4077                         chk->data = NULL;
4078                 }
4079                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4080                 return (ret_code);
4081         }
4082         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4083
4084         /* setup chunk parameters */
4085         chk->sent = SCTP_DATAGRAM_UNSENT;
4086         chk->snd_count = 0;
4087         chk->whoTo = NULL;
4088
4089         ch = mtod(chk->data, struct sctp_chunkhdr *);
4090         ch->chunk_type = SCTP_STREAM_RESET;
4091         ch->chunk_flags = 0;
4092         ch->chunk_length = htons(chk->send_size);
4093         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4094         offset += sizeof(struct sctp_chunkhdr);
4095         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4096                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4097                 if (ph == NULL) {
4098                         /* TSNH */
4099                         break;
4100                 }
4101                 param_len = ntohs(ph->param_length);
4102                 if ((param_len > remaining_length) ||
4103                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4104                         /* bad parameter length */
4105                         break;
4106                 }
4107                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4108                     (uint8_t *) & cstore);
4109                 if (ph == NULL) {
4110                         /* TSNH */
4111                         break;
4112                 }
4113                 ptype = ntohs(ph->param_type);
4114                 num_param++;
4115                 if (param_len > sizeof(cstore)) {
4116                         trunc = 1;
4117                 } else {
4118                         trunc = 0;
4119                 }
4120                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4121                         /* hit the max of parameters already sorry.. */
4122                         break;
4123                 }
4124                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4125                         struct sctp_stream_reset_out_request *req_out;
4126
4127                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4128                                 break;
4129                         }
4130                         req_out = (struct sctp_stream_reset_out_request *)ph;
4131                         num_req++;
4132                         if (stcb->asoc.stream_reset_outstanding) {
4133                                 seq = ntohl(req_out->response_seq);
4134                                 if (seq == stcb->asoc.str_reset_seq_out) {
4135                                         /* implicit ack */
4136                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4137                                 }
4138                         }
4139                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4140                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4141                         struct sctp_stream_reset_add_strm *str_add;
4142
4143                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4144                                 break;
4145                         }
4146                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4147                         num_req++;
4148                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4149                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4150                         struct sctp_stream_reset_add_strm *str_add;
4151
4152                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4153                                 break;
4154                         }
4155                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4156                         num_req++;
4157                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4158                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4159                         struct sctp_stream_reset_in_request *req_in;
4160
4161                         num_req++;
4162                         req_in = (struct sctp_stream_reset_in_request *)ph;
4163                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4164                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4165                         struct sctp_stream_reset_tsn_request *req_tsn;
4166
4167                         num_req++;
4168                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4169                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4170                                 ret_code = 1;
4171                                 goto strres_nochunk;
4172                         }
4173                         /* no more */
4174                         break;
4175                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4176                         struct sctp_stream_reset_response *resp;
4177                         uint32_t result;
4178
4179                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4180                                 break;
4181                         }
4182                         resp = (struct sctp_stream_reset_response *)ph;
4183                         seq = ntohl(resp->response_seq);
4184                         result = ntohl(resp->result);
4185                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4186                                 ret_code = 1;
4187                                 goto strres_nochunk;
4188                         }
4189                 } else {
4190                         break;
4191                 }
4192                 offset += SCTP_SIZE32(param_len);
4193                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4194                         remaining_length -= SCTP_SIZE32(param_len);
4195                 } else {
4196                         remaining_length = 0;
4197                 }
4198         }
4199         if (num_req == 0) {
4200                 /* we have no response free the stuff */
4201                 goto strres_nochunk;
4202         }
4203         /* ok we have a chunk to link in */
4204         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4205             chk,
4206             sctp_next);
4207         stcb->asoc.ctrl_queue_cnt++;
4208         return (ret_code);
4209 }
4210
4211 /*
4212  * Handle a router or endpoints report of a packet loss, there are two ways
4213  * to handle this, either we get the whole packet and must disect it
4214  * ourselves (possibly with truncation and or corruption) or it is a summary
4215  * from a middle box that did the disectting for us.
4216  */
4217 static void
4218 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4219     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4220 {
4221         uint32_t bottle_bw, on_queue;
4222         uint16_t trunc_len;
4223         unsigned int chlen;
4224         unsigned int at;
4225         struct sctp_chunk_desc desc;
4226         struct sctp_chunkhdr *ch;
4227
4228         chlen = ntohs(cp->ch.chunk_length);
4229         chlen -= sizeof(struct sctp_pktdrop_chunk);
4230         /* XXX possible chlen underflow */
4231         if (chlen == 0) {
4232                 ch = NULL;
4233                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4234                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4235         } else {
4236                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4237                 chlen -= sizeof(struct sctphdr);
4238                 /* XXX possible chlen underflow */
4239                 memset(&desc, 0, sizeof(desc));
4240         }
4241         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4242         if (trunc_len > limit) {
4243                 trunc_len = limit;
4244         }
4245         /* now the chunks themselves */
4246         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4247                 desc.chunk_type = ch->chunk_type;
4248                 /* get amount we need to move */
4249                 at = ntohs(ch->chunk_length);
4250                 if (at < sizeof(struct sctp_chunkhdr)) {
4251                         /* corrupt chunk, maybe at the end? */
4252                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4253                         break;
4254                 }
4255                 if (trunc_len == 0) {
4256                         /* we are supposed to have all of it */
4257                         if (at > chlen) {
4258                                 /* corrupt skip it */
4259                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4260                                 break;
4261                         }
4262                 } else {
4263                         /* is there enough of it left ? */
4264                         if (desc.chunk_type == SCTP_DATA) {
4265                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4266                                     sizeof(desc.data_bytes))) {
4267                                         break;
4268                                 }
4269                         } else {
4270                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4271                                         break;
4272                                 }
4273                         }
4274                 }
4275                 if (desc.chunk_type == SCTP_DATA) {
4276                         /* can we get out the tsn? */
4277                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4278                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4279
4280                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4281                                 /* yep */
4282                                 struct sctp_data_chunk *dcp;
4283                                 uint8_t *ddp;
4284                                 unsigned int iii;
4285
4286                                 dcp = (struct sctp_data_chunk *)ch;
4287                                 ddp = (uint8_t *) (dcp + 1);
4288                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4289                                         desc.data_bytes[iii] = ddp[iii];
4290                                 }
4291                                 desc.tsn_ifany = dcp->dp.tsn;
4292                         } else {
4293                                 /* nope we are done. */
4294                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4295                                 break;
4296                         }
4297                 } else {
4298                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4299                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4300                 }
4301
4302                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4303                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4304                         break;
4305                 }
4306                 if (SCTP_SIZE32(at) > chlen) {
4307                         break;
4308                 }
4309                 chlen -= SCTP_SIZE32(at);
4310                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4311                         /* done, none left */
4312                         break;
4313                 }
4314                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4315         }
4316         /* Now update any rwnd --- possibly */
4317         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4318                 /* From a peer, we get a rwnd report */
4319                 uint32_t a_rwnd;
4320
4321                 SCTP_STAT_INCR(sctps_pdrpfehos);
4322
4323                 bottle_bw = ntohl(cp->bottle_bw);
4324                 on_queue = ntohl(cp->current_onq);
4325                 if (bottle_bw && on_queue) {
4326                         /* a rwnd report is in here */
4327                         if (bottle_bw > on_queue)
4328                                 a_rwnd = bottle_bw - on_queue;
4329                         else
4330                                 a_rwnd = 0;
4331
4332                         if (a_rwnd == 0)
4333                                 stcb->asoc.peers_rwnd = 0;
4334                         else {
4335                                 if (a_rwnd > stcb->asoc.total_flight) {
4336                                         stcb->asoc.peers_rwnd =
4337                                             a_rwnd - stcb->asoc.total_flight;
4338                                 } else {
4339                                         stcb->asoc.peers_rwnd = 0;
4340                                 }
4341                                 if (stcb->asoc.peers_rwnd <
4342                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4343                                         /* SWS sender side engages */
4344                                         stcb->asoc.peers_rwnd = 0;
4345                                 }
4346                         }
4347                 }
4348         } else {
4349                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4350         }
4351
4352         /* now middle boxes in sat networks get a cwnd bump */
4353         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4354             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4355             (stcb->asoc.sat_network)) {
4356                 /*
4357                  * This is debateable but for sat networks it makes sense
4358                  * Note if a T3 timer has went off, we will prohibit any
4359                  * changes to cwnd until we exit the t3 loss recovery.
4360                  */
4361                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4362                     net, cp, &bottle_bw, &on_queue);
4363         }
4364 }
4365
4366 /*
4367  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4368  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4369  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4370  * length of the complete packet outputs: - length: modified to remaining
4371  * length after control processing - netp: modified to new sctp_nets after
4372  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4373  * bad packet,...) otherwise return the tcb for this packet
4374  */
4375 #ifdef __GNUC__
4376 __attribute__((noinline))
4377 #endif
4378         static struct sctp_tcb *
4379                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4380              struct sockaddr *src, struct sockaddr *dst,
4381              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4382              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4383              uint8_t mflowtype, uint32_t mflowid,
4384              uint32_t vrf_id, uint16_t port)
4385 {
4386         struct sctp_association *asoc;
4387         struct mbuf *op_err;
4388         char msg[SCTP_DIAG_INFO_LEN];
4389         uint32_t vtag_in;
4390         int num_chunks = 0;     /* number of control chunks processed */
4391         uint32_t chk_length;
4392         int ret;
4393         int abort_no_unlock = 0;
4394         int ecne_seen = 0;
4395
4396         /*
4397          * How big should this be, and should it be alloc'd? Lets try the
4398          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4399          * until we get into jumbo grams and such..
4400          */
4401         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4402         struct sctp_tcb *locked_tcb = stcb;
4403         int got_auth = 0;
4404         uint32_t auth_offset = 0, auth_len = 0;
4405         int auth_skipped = 0;
4406         int asconf_cnt = 0;
4407
4408 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4409         struct socket *so;
4410
4411 #endif
4412
4413         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4414             iphlen, *offset, length, (void *)stcb);
4415
4416         /* validate chunk header length... */
4417         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4418                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4419                     ntohs(ch->chunk_length));
4420                 if (locked_tcb) {
4421                         SCTP_TCB_UNLOCK(locked_tcb);
4422                 }
4423                 return (NULL);
4424         }
4425         /*
4426          * validate the verification tag
4427          */
4428         vtag_in = ntohl(sh->v_tag);
4429
4430         if (locked_tcb) {
4431                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4432         }
4433         if (ch->chunk_type == SCTP_INITIATION) {
4434                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4435                     ntohs(ch->chunk_length), vtag_in);
4436                 if (vtag_in != 0) {
4437                         /* protocol error- silently discard... */
4438                         SCTP_STAT_INCR(sctps_badvtag);
4439                         if (locked_tcb) {
4440                                 SCTP_TCB_UNLOCK(locked_tcb);
4441                         }
4442                         return (NULL);
4443                 }
4444         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4445                 /*
4446                  * If there is no stcb, skip the AUTH chunk and process
4447                  * later after a stcb is found (to validate the lookup was
4448                  * valid.
4449                  */
4450                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4451                     (stcb == NULL) &&
4452                     (inp->auth_supported == 1)) {
4453                         /* save this chunk for later processing */
4454                         auth_skipped = 1;
4455                         auth_offset = *offset;
4456                         auth_len = ntohs(ch->chunk_length);
4457
4458                         /* (temporarily) move past this chunk */
4459                         *offset += SCTP_SIZE32(auth_len);
4460                         if (*offset >= length) {
4461                                 /* no more data left in the mbuf chain */
4462                                 *offset = length;
4463                                 if (locked_tcb) {
4464                                         SCTP_TCB_UNLOCK(locked_tcb);
4465                                 }
4466                                 return (NULL);
4467                         }
4468                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4469                             sizeof(struct sctp_chunkhdr), chunk_buf);
4470                 }
4471                 if (ch == NULL) {
4472                         /* Help */
4473                         *offset = length;
4474                         if (locked_tcb) {
4475                                 SCTP_TCB_UNLOCK(locked_tcb);
4476                         }
4477                         return (NULL);
4478                 }
4479                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4480                         goto process_control_chunks;
4481                 }
4482                 /*
4483                  * first check if it's an ASCONF with an unknown src addr we
4484                  * need to look inside to find the association
4485                  */
4486                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4487                         struct sctp_chunkhdr *asconf_ch = ch;
4488                         uint32_t asconf_offset = 0, asconf_len = 0;
4489
4490                         /* inp's refcount may be reduced */
4491                         SCTP_INP_INCR_REF(inp);
4492
4493                         asconf_offset = *offset;
4494                         do {
4495                                 asconf_len = ntohs(asconf_ch->chunk_length);
4496                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4497                                         break;
4498                                 stcb = sctp_findassociation_ep_asconf(m,
4499                                     *offset,
4500                                     dst,
4501                                     sh, &inp, netp, vrf_id);
4502                                 if (stcb != NULL)
4503                                         break;
4504                                 asconf_offset += SCTP_SIZE32(asconf_len);
4505                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4506                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4507                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4508                         if (stcb == NULL) {
4509                                 /*
4510                                  * reduce inp's refcount if not reduced in
4511                                  * sctp_findassociation_ep_asconf().
4512                                  */
4513                                 SCTP_INP_DECR_REF(inp);
4514                         } else {
4515                                 locked_tcb = stcb;
4516                         }
4517
4518                         /* now go back and verify any auth chunk to be sure */
4519                         if (auth_skipped && (stcb != NULL)) {
4520                                 struct sctp_auth_chunk *auth;
4521
4522                                 auth = (struct sctp_auth_chunk *)
4523                                     sctp_m_getptr(m, auth_offset,
4524                                     auth_len, chunk_buf);
4525                                 got_auth = 1;
4526                                 auth_skipped = 0;
4527                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4528                                     auth_offset)) {
4529                                         /* auth HMAC failed so dump it */
4530                                         *offset = length;
4531                                         if (locked_tcb) {
4532                                                 SCTP_TCB_UNLOCK(locked_tcb);
4533                                         }
4534                                         return (NULL);
4535                                 } else {
4536                                         /* remaining chunks are HMAC checked */
4537                                         stcb->asoc.authenticated = 1;
4538                                 }
4539                         }
4540                 }
4541                 if (stcb == NULL) {
4542                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4543                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4544                             msg);
4545                         /* no association, so it's out of the blue... */
4546                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4547                             mflowtype, mflowid,
4548                             vrf_id, port);
4549                         *offset = length;
4550                         if (locked_tcb) {
4551                                 SCTP_TCB_UNLOCK(locked_tcb);
4552                         }
4553                         return (NULL);
4554                 }
4555                 asoc = &stcb->asoc;
4556                 /* ABORT and SHUTDOWN can use either v_tag... */
4557                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4558                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4559                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4560                         /* Take the T-bit always into account. */
4561                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4562                             (vtag_in == asoc->my_vtag)) ||
4563                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4564                             (vtag_in == asoc->peer_vtag))) {
4565                                 /* this is valid */
4566                         } else {
4567                                 /* drop this packet... */
4568                                 SCTP_STAT_INCR(sctps_badvtag);
4569                                 if (locked_tcb) {
4570                                         SCTP_TCB_UNLOCK(locked_tcb);
4571                                 }
4572                                 return (NULL);
4573                         }
4574                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4575                         if (vtag_in != asoc->my_vtag) {
4576                                 /*
4577                                  * this could be a stale SHUTDOWN-ACK or the
4578                                  * peer never got the SHUTDOWN-COMPLETE and
4579                                  * is still hung; we have started a new asoc
4580                                  * but it won't complete until the shutdown
4581                                  * is completed
4582                                  */
4583                                 if (locked_tcb) {
4584                                         SCTP_TCB_UNLOCK(locked_tcb);
4585                                 }
4586                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4587                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4588                                     msg);
4589                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4590                                     sh, inp, op_err,
4591                                     mflowtype, mflowid,
4592                                     vrf_id, port);
4593                                 return (NULL);
4594                         }
4595                 } else {
4596                         /* for all other chunks, vtag must match */
4597                         if (vtag_in != asoc->my_vtag) {
4598                                 /* invalid vtag... */
4599                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4600                                     "invalid vtag: %xh, expect %xh\n",
4601                                     vtag_in, asoc->my_vtag);
4602                                 SCTP_STAT_INCR(sctps_badvtag);
4603                                 if (locked_tcb) {
4604                                         SCTP_TCB_UNLOCK(locked_tcb);
4605                                 }
4606                                 *offset = length;
4607                                 return (NULL);
4608                         }
4609                 }
4610         }                       /* end if !SCTP_COOKIE_ECHO */
4611         /*
4612          * process all control chunks...
4613          */
4614         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4615             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4616             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4617             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4618                 /* implied cookie-ack.. we must have lost the ack */
4619                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4620                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4621                             stcb->asoc.overall_error_count,
4622                             0,
4623                             SCTP_FROM_SCTP_INPUT,
4624                             __LINE__);
4625                 }
4626                 stcb->asoc.overall_error_count = 0;
4627                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4628                     *netp);
4629         }
4630 process_control_chunks:
4631         while (IS_SCTP_CONTROL(ch)) {
4632                 /* validate chunk length */
4633                 chk_length = ntohs(ch->chunk_length);
4634                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4635                     ch->chunk_type, chk_length);
4636                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4637                 if (chk_length < sizeof(*ch) ||
4638                     (*offset + (int)chk_length) > length) {
4639                         *offset = length;
4640                         if (locked_tcb) {
4641                                 SCTP_TCB_UNLOCK(locked_tcb);
4642                         }
4643                         return (NULL);
4644                 }
4645                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4646                 /*
4647                  * INIT-ACK only gets the init ack "header" portion only
4648                  * because we don't have to process the peer's COOKIE. All
4649                  * others get a complete chunk.
4650                  */
4651                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4652                     (ch->chunk_type == SCTP_INITIATION)) {
4653                         /* get an init-ack chunk */
4654                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4655                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4656                         if (ch == NULL) {
4657                                 *offset = length;
4658                                 if (locked_tcb) {
4659                                         SCTP_TCB_UNLOCK(locked_tcb);
4660                                 }
4661                                 return (NULL);
4662                         }
4663                 } else {
4664                         /* For cookies and all other chunks. */
4665                         if (chk_length > sizeof(chunk_buf)) {
4666                                 /*
4667                                  * use just the size of the chunk buffer so
4668                                  * the front part of our chunks fit in
4669                                  * contiguous space up to the chunk buffer
4670                                  * size (508 bytes). For chunks that need to
4671                                  * get more than that they must use the
4672                                  * sctp_m_getptr() function or other means
4673                                  * (e.g. know how to parse mbuf chains).
4674                                  * Cookies do this already.
4675                                  */
4676                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4677                                     (sizeof(chunk_buf) - 4),
4678                                     chunk_buf);
4679                                 if (ch == NULL) {
4680                                         *offset = length;
4681                                         if (locked_tcb) {
4682                                                 SCTP_TCB_UNLOCK(locked_tcb);
4683                                         }
4684                                         return (NULL);
4685                                 }
4686                         } else {
4687                                 /* We can fit it all */
4688                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4689                                     chk_length, chunk_buf);
4690                                 if (ch == NULL) {
4691                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4692                                         *offset = length;
4693                                         if (locked_tcb) {
4694                                                 SCTP_TCB_UNLOCK(locked_tcb);
4695                                         }
4696                                         return (NULL);
4697                                 }
4698                         }
4699                 }
4700                 num_chunks++;
4701                 /* Save off the last place we got a control from */
4702                 if (stcb != NULL) {
4703                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4704                                 /*
4705                                  * allow last_control to be NULL if
4706                                  * ASCONF... ASCONF processing will find the
4707                                  * right net later
4708                                  */
4709                                 if ((netp != NULL) && (*netp != NULL))
4710                                         stcb->asoc.last_control_chunk_from = *netp;
4711                         }
4712                 }
4713 #ifdef SCTP_AUDITING_ENABLED
4714                 sctp_audit_log(0xB0, ch->chunk_type);
4715 #endif
4716
4717                 /* check to see if this chunk required auth, but isn't */
4718                 if ((stcb != NULL) &&
4719                     (stcb->asoc.auth_supported == 1) &&
4720                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4721                     !stcb->asoc.authenticated) {
4722                         /* "silently" ignore */
4723                         SCTP_STAT_INCR(sctps_recvauthmissing);
4724                         goto next_chunk;
4725                 }
4726                 switch (ch->chunk_type) {
4727                 case SCTP_INITIATION:
4728                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4729                         /* The INIT chunk must be the only chunk. */
4730                         if ((num_chunks > 1) ||
4731                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4732                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4733                                     "INIT not the only chunk");
4734                                 sctp_abort_association(inp, stcb, m, iphlen,
4735                                     src, dst, sh, op_err,
4736                                     mflowtype, mflowid,
4737                                     vrf_id, port);
4738                                 *offset = length;
4739                                 return (NULL);
4740                         }
4741                         /* Honor our resource limit. */
4742                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4743                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4744                                 sctp_abort_association(inp, stcb, m, iphlen,
4745                                     src, dst, sh, op_err,
4746                                     mflowtype, mflowid,
4747                                     vrf_id, port);
4748                                 *offset = length;
4749                                 return (NULL);
4750                         }
4751                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4752                             (struct sctp_init_chunk *)ch, inp,
4753                             stcb, &abort_no_unlock,
4754                             mflowtype, mflowid,
4755                             vrf_id, port);
4756                         *offset = length;
4757                         if ((!abort_no_unlock) && (locked_tcb)) {
4758                                 SCTP_TCB_UNLOCK(locked_tcb);
4759                         }
4760                         return (NULL);
4761                         break;
4762                 case SCTP_PAD_CHUNK:
4763                         break;
4764                 case SCTP_INITIATION_ACK:
4765                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4766                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4767                                 /* We are not interested anymore */
4768                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4769                                         ;
4770                                 } else {
4771                                         if (locked_tcb != stcb) {
4772                                                 /* Very unlikely */
4773                                                 SCTP_TCB_UNLOCK(locked_tcb);
4774                                         }
4775                                         *offset = length;
4776                                         if (stcb) {
4777 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4778                                                 so = SCTP_INP_SO(inp);
4779                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4780                                                 SCTP_TCB_UNLOCK(stcb);
4781                                                 SCTP_SOCKET_LOCK(so, 1);
4782                                                 SCTP_TCB_LOCK(stcb);
4783                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4784 #endif
4785                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4786 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4787                                                 SCTP_SOCKET_UNLOCK(so, 1);
4788 #endif
4789                                         }
4790                                         return (NULL);
4791                                 }
4792                         }
4793                         /* The INIT-ACK chunk must be the only chunk. */
4794                         if ((num_chunks > 1) ||
4795                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4796                                 *offset = length;
4797                                 if (locked_tcb) {
4798                                         SCTP_TCB_UNLOCK(locked_tcb);
4799                                 }
4800                                 return (NULL);
4801                         }
4802                         if ((netp) && (*netp)) {
4803                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4804                                     src, dst, sh,
4805                                     (struct sctp_init_ack_chunk *)ch,
4806                                     stcb, *netp,
4807                                     &abort_no_unlock,
4808                                     mflowtype, mflowid,
4809                                     vrf_id);
4810                         } else {
4811                                 ret = -1;
4812                         }
4813                         *offset = length;
4814                         if (abort_no_unlock) {
4815                                 return (NULL);
4816                         }
4817                         /*
4818                          * Special case, I must call the output routine to
4819                          * get the cookie echoed
4820                          */
4821                         if ((stcb != NULL) && (ret == 0)) {
4822                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4823                         }
4824                         if (locked_tcb) {
4825                                 SCTP_TCB_UNLOCK(locked_tcb);
4826                         }
4827                         return (NULL);
4828                         break;
4829                 case SCTP_SELECTIVE_ACK:
4830                         {
4831                                 struct sctp_sack_chunk *sack;
4832                                 int abort_now = 0;
4833                                 uint32_t a_rwnd, cum_ack;
4834                                 uint16_t num_seg, num_dup;
4835                                 uint8_t flags;
4836                                 int offset_seg, offset_dup;
4837
4838                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4839                                 SCTP_STAT_INCR(sctps_recvsacks);
4840                                 if (stcb == NULL) {
4841                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4842                                         break;
4843                                 }
4844                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4845                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4846                                         break;
4847                                 }
4848                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4849                                         /*-
4850                                          * If we have sent a shutdown-ack, we will pay no
4851                                          * attention to a sack sent in to us since
4852                                          * we don't care anymore.
4853                                          */
4854                                         break;
4855                                 }
4856                                 sack = (struct sctp_sack_chunk *)ch;
4857                                 flags = ch->chunk_flags;
4858                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4859                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4860                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4861                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4862                                 if (sizeof(struct sctp_sack_chunk) +
4863                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4864                                     num_dup * sizeof(uint32_t) != chk_length) {
4865                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4866                                         break;
4867                                 }
4868                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4869                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4870                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4871                                     cum_ack, num_seg, a_rwnd);
4872                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4873                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4874                                     (num_seg == 0) &&
4875                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4876                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4877                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4878                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4879                                     ) {
4880                                         /*
4881                                          * We have a SIMPLE sack having no
4882                                          * prior segments and data on sent
4883                                          * queue to be acked.. Use the
4884                                          * faster path sack processing. We
4885                                          * also allow window update sacks
4886                                          * with no missing segments to go
4887                                          * this way too.
4888                                          */
4889                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4890                                 } else {
4891                                         if (netp && *netp)
4892                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4893                                                     num_seg, 0, num_dup, &abort_now, flags,
4894                                                     cum_ack, a_rwnd, ecne_seen);
4895                                 }
4896                                 if (abort_now) {
4897                                         /* ABORT signal from sack processing */
4898                                         *offset = length;
4899                                         return (NULL);
4900                                 }
4901                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4902                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4903                                     (stcb->asoc.stream_queue_cnt == 0)) {
4904                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4905                                 }
4906                         }
4907                         break;
4908                         /*
4909                          * EY - nr_sack:  If the received chunk is an
4910                          * nr_sack chunk
4911                          */
4912                 case SCTP_NR_SELECTIVE_ACK:
4913                         {
4914                                 struct sctp_nr_sack_chunk *nr_sack;
4915                                 int abort_now = 0;
4916                                 uint32_t a_rwnd, cum_ack;
4917                                 uint16_t num_seg, num_nr_seg, num_dup;
4918                                 uint8_t flags;
4919                                 int offset_seg, offset_dup;
4920
4921                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4922                                 SCTP_STAT_INCR(sctps_recvsacks);
4923                                 if (stcb == NULL) {
4924                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4925                                         break;
4926                                 }
4927                                 if (stcb->asoc.nrsack_supported == 0) {
4928                                         goto unknown_chunk;
4929                                 }
4930                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4931                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4932                                         break;
4933                                 }
4934                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4935                                         /*-
4936                                          * If we have sent a shutdown-ack, we will pay no
4937                                          * attention to a sack sent in to us since
4938                                          * we don't care anymore.
4939                                          */
4940                                         break;
4941                                 }
4942                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4943                                 flags = ch->chunk_flags;
4944                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4945                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4946                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4947                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4948                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4949                                 if (sizeof(struct sctp_nr_sack_chunk) +
4950                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4951                                     num_dup * sizeof(uint32_t) != chk_length) {
4952                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4953                                         break;
4954                                 }
4955                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4956                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4957                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4958                                     cum_ack, num_seg, a_rwnd);
4959                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4960                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4961                                     (num_seg == 0) && (num_nr_seg == 0) &&
4962                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4963                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4964                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4965                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4966                                         /*
4967                                          * We have a SIMPLE sack having no
4968                                          * prior segments and data on sent
4969                                          * queue to be acked. Use the faster
4970                                          * path sack processing. We also
4971                                          * allow window update sacks with no
4972                                          * missing segments to go this way
4973                                          * too.
4974                                          */
4975                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4976                                             &abort_now, ecne_seen);
4977                                 } else {
4978                                         if (netp && *netp)
4979                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4980                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4981                                                     cum_ack, a_rwnd, ecne_seen);
4982                                 }
4983                                 if (abort_now) {
4984                                         /* ABORT signal from sack processing */
4985                                         *offset = length;
4986                                         return (NULL);
4987                                 }
4988                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4989                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4990                                     (stcb->asoc.stream_queue_cnt == 0)) {
4991                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4992                                 }
4993                         }
4994                         break;
4995
4996                 case SCTP_HEARTBEAT_REQUEST:
4997                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4998                         if ((stcb) && netp && *netp) {
4999                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5000                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5001                                     chk_length, *netp);
5002
5003                                 /* He's alive so give him credit */
5004                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5005                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5006                                             stcb->asoc.overall_error_count,
5007                                             0,
5008                                             SCTP_FROM_SCTP_INPUT,
5009                                             __LINE__);
5010                                 }
5011                                 stcb->asoc.overall_error_count = 0;
5012                         }
5013                         break;
5014                 case SCTP_HEARTBEAT_ACK:
5015                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5016                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5017                                 /* Its not ours */
5018                                 *offset = length;
5019                                 if (locked_tcb) {
5020                                         SCTP_TCB_UNLOCK(locked_tcb);
5021                                 }
5022                                 return (NULL);
5023                         }
5024                         /* He's alive so give him credit */
5025                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5026                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5027                                     stcb->asoc.overall_error_count,
5028                                     0,
5029                                     SCTP_FROM_SCTP_INPUT,
5030                                     __LINE__);
5031                         }
5032                         stcb->asoc.overall_error_count = 0;
5033                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5034                         if (netp && *netp)
5035                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5036                                     stcb, *netp);
5037                         break;
5038                 case SCTP_ABORT_ASSOCIATION:
5039                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5040                             (void *)stcb);
5041                         if ((stcb) && netp && *netp)
5042                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5043                                     stcb, *netp);
5044                         *offset = length;
5045                         return (NULL);
5046                         break;
5047                 case SCTP_SHUTDOWN:
5048                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5049                             (void *)stcb);
5050                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5051                                 *offset = length;
5052                                 if (locked_tcb) {
5053                                         SCTP_TCB_UNLOCK(locked_tcb);
5054                                 }
5055                                 return (NULL);
5056                         }
5057                         if (netp && *netp) {
5058                                 int abort_flag = 0;
5059
5060                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5061                                     stcb, *netp, &abort_flag);
5062                                 if (abort_flag) {
5063                                         *offset = length;
5064                                         return (NULL);
5065                                 }
5066                         }
5067                         break;
5068                 case SCTP_SHUTDOWN_ACK:
5069                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5070                         if ((stcb) && (netp) && (*netp))
5071                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5072                         *offset = length;
5073                         return (NULL);
5074                         break;
5075
5076                 case SCTP_OPERATION_ERROR:
5077                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5078                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5079                                 *offset = length;
5080                                 return (NULL);
5081                         }
5082                         break;
5083                 case SCTP_COOKIE_ECHO:
5084                         SCTPDBG(SCTP_DEBUG_INPUT3,
5085                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5086                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5087                                 ;
5088                         } else {
5089                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5090                                         /* We are not interested anymore */
5091                         abend:
5092                                         if (stcb) {
5093                                                 SCTP_TCB_UNLOCK(stcb);
5094                                         }
5095                                         *offset = length;
5096                                         return (NULL);
5097                                 }
5098                         }
5099                         /*
5100                          * First are we accepting? We do this again here
5101                          * since it is possible that a previous endpoint WAS
5102                          * listening responded to a INIT-ACK and then
5103                          * closed. We opened and bound.. and are now no
5104                          * longer listening.
5105                          */
5106
5107                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5108                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5109                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5110                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5111                                         sctp_abort_association(inp, stcb, m, iphlen,
5112                                             src, dst, sh, op_err,
5113                                             mflowtype, mflowid,
5114                                             vrf_id, port);
5115                                 }
5116                                 *offset = length;
5117                                 return (NULL);
5118                         } else {
5119                                 struct mbuf *ret_buf;
5120                                 struct sctp_inpcb *linp;
5121
5122                                 if (stcb) {
5123                                         linp = NULL;
5124                                 } else {
5125                                         linp = inp;
5126                                 }
5127
5128                                 if (linp) {
5129                                         SCTP_ASOC_CREATE_LOCK(linp);
5130                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5131                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5132                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5133                                                 goto abend;
5134                                         }
5135                                 }
5136                                 if (netp) {
5137                                         ret_buf =
5138                                             sctp_handle_cookie_echo(m, iphlen,
5139                                             *offset,
5140                                             src, dst,
5141                                             sh,
5142                                             (struct sctp_cookie_echo_chunk *)ch,
5143                                             &inp, &stcb, netp,
5144                                             auth_skipped,
5145                                             auth_offset,
5146                                             auth_len,
5147                                             &locked_tcb,
5148                                             mflowtype,
5149                                             mflowid,
5150                                             vrf_id,
5151                                             port);
5152                                 } else {
5153                                         ret_buf = NULL;
5154                                 }
5155                                 if (linp) {
5156                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5157                                 }
5158                                 if (ret_buf == NULL) {
5159                                         if (locked_tcb) {
5160                                                 SCTP_TCB_UNLOCK(locked_tcb);
5161                                         }
5162                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5163                                             "GAK, null buffer\n");
5164                                         *offset = length;
5165                                         return (NULL);
5166                                 }
5167                                 /* if AUTH skipped, see if it verified... */
5168                                 if (auth_skipped) {
5169                                         got_auth = 1;
5170                                         auth_skipped = 0;
5171                                 }
5172                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5173                                         /*
5174                                          * Restart the timer if we have
5175                                          * pending data
5176                                          */
5177                                         struct sctp_tmit_chunk *chk;
5178
5179                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5180                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5181                                 }
5182                         }
5183                         break;
5184                 case SCTP_COOKIE_ACK:
5185                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5186                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5187                                 if (locked_tcb) {
5188                                         SCTP_TCB_UNLOCK(locked_tcb);
5189                                 }
5190                                 return (NULL);
5191                         }
5192                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5193                                 /* We are not interested anymore */
5194                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5195                                         ;
5196                                 } else if (stcb) {
5197 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5198                                         so = SCTP_INP_SO(inp);
5199                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5200                                         SCTP_TCB_UNLOCK(stcb);
5201                                         SCTP_SOCKET_LOCK(so, 1);
5202                                         SCTP_TCB_LOCK(stcb);
5203                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5204 #endif
5205                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5206 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5207                                         SCTP_SOCKET_UNLOCK(so, 1);
5208 #endif
5209                                         *offset = length;
5210                                         return (NULL);
5211                                 }
5212                         }
5213                         /* He's alive so give him credit */
5214                         if ((stcb) && netp && *netp) {
5215                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5216                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5217                                             stcb->asoc.overall_error_count,
5218                                             0,
5219                                             SCTP_FROM_SCTP_INPUT,
5220                                             __LINE__);
5221                                 }
5222                                 stcb->asoc.overall_error_count = 0;
5223                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5224                         }
5225                         break;
5226                 case SCTP_ECN_ECHO:
5227                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5228                         /* He's alive so give him credit */
5229                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5230                                 /* Its not ours */
5231                                 if (locked_tcb) {
5232                                         SCTP_TCB_UNLOCK(locked_tcb);
5233                                 }
5234                                 *offset = length;
5235                                 return (NULL);
5236                         }
5237                         if (stcb) {
5238                                 if (stcb->asoc.ecn_supported == 0) {
5239                                         goto unknown_chunk;
5240                                 }
5241                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5242                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5243                                             stcb->asoc.overall_error_count,
5244                                             0,
5245                                             SCTP_FROM_SCTP_INPUT,
5246                                             __LINE__);
5247                                 }
5248                                 stcb->asoc.overall_error_count = 0;
5249                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5250                                     stcb);
5251                                 ecne_seen = 1;
5252                         }
5253                         break;
5254                 case SCTP_ECN_CWR:
5255                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5256                         /* He's alive so give him credit */
5257                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_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_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5278                         }
5279                         break;
5280                 case SCTP_SHUTDOWN_COMPLETE:
5281                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5282                         /* must be first and only chunk */
5283                         if ((num_chunks > 1) ||
5284                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5285                                 *offset = length;
5286                                 if (locked_tcb) {
5287                                         SCTP_TCB_UNLOCK(locked_tcb);
5288                                 }
5289                                 return (NULL);
5290                         }
5291                         if ((stcb) && netp && *netp) {
5292                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5293                                     stcb, *netp);
5294                         }
5295                         *offset = length;
5296                         return (NULL);
5297                         break;
5298                 case SCTP_ASCONF:
5299                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5300                         /* He's alive so give him credit */
5301                         if (stcb) {
5302                                 if (stcb->asoc.asconf_supported == 0) {
5303                                         goto unknown_chunk;
5304                                 }
5305                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5306                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5307                                             stcb->asoc.overall_error_count,
5308                                             0,
5309                                             SCTP_FROM_SCTP_INPUT,
5310                                             __LINE__);
5311                                 }
5312                                 stcb->asoc.overall_error_count = 0;
5313                                 sctp_handle_asconf(m, *offset, src,
5314                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5315                                 asconf_cnt++;
5316                         }
5317                         break;
5318                 case SCTP_ASCONF_ACK:
5319                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5320                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5321                                 /* Its not ours */
5322                                 if (locked_tcb) {
5323                                         SCTP_TCB_UNLOCK(locked_tcb);
5324                                 }
5325                                 *offset = length;
5326                                 return (NULL);
5327                         }
5328                         if ((stcb) && netp && *netp) {
5329                                 if (stcb->asoc.asconf_supported == 0) {
5330                                         goto unknown_chunk;
5331                                 }
5332                                 /* He's alive so give him credit */
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_ack(m, *offset,
5342                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5343                                 if (abort_no_unlock)
5344                                         return (NULL);
5345                         }
5346                         break;
5347                 case SCTP_FORWARD_CUM_TSN:
5348                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5349                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5350                                 /* Its not ours */
5351                                 if (locked_tcb) {
5352                                         SCTP_TCB_UNLOCK(locked_tcb);
5353                                 }
5354                                 *offset = length;
5355                                 return (NULL);
5356                         }
5357                         /* He's alive so give him credit */
5358                         if (stcb) {
5359                                 int abort_flag = 0;
5360
5361                                 if (stcb->asoc.prsctp_supported == 0) {
5362                                         goto unknown_chunk;
5363                                 }
5364                                 stcb->asoc.overall_error_count = 0;
5365                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5366                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5367                                             stcb->asoc.overall_error_count,
5368                                             0,
5369                                             SCTP_FROM_SCTP_INPUT,
5370                                             __LINE__);
5371                                 }
5372                                 *fwd_tsn_seen = 1;
5373                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5374                                         /* We are not interested anymore */
5375 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5376                                         so = SCTP_INP_SO(inp);
5377                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5378                                         SCTP_TCB_UNLOCK(stcb);
5379                                         SCTP_SOCKET_LOCK(so, 1);
5380                                         SCTP_TCB_LOCK(stcb);
5381                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5382 #endif
5383                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5384 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5385                                         SCTP_SOCKET_UNLOCK(so, 1);
5386 #endif
5387                                         *offset = length;
5388                                         return (NULL);
5389                                 }
5390                                 sctp_handle_forward_tsn(stcb,
5391                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5392                                 if (abort_flag) {
5393                                         *offset = length;
5394                                         return (NULL);
5395                                 } else {
5396                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5397                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5398                                                     stcb->asoc.overall_error_count,
5399                                                     0,
5400                                                     SCTP_FROM_SCTP_INPUT,
5401                                                     __LINE__);
5402                                         }
5403                                         stcb->asoc.overall_error_count = 0;
5404                                 }
5405
5406                         }
5407                         break;
5408                 case SCTP_STREAM_RESET:
5409                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5410                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5411                                 /* Its not ours */
5412                                 if (locked_tcb) {
5413                                         SCTP_TCB_UNLOCK(locked_tcb);
5414                                 }
5415                                 *offset = length;
5416                                 return (NULL);
5417                         }
5418                         if (stcb->asoc.reconfig_supported == 0) {
5419                                 goto unknown_chunk;
5420                         }
5421                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5422                                 /* stop processing */
5423                                 *offset = length;
5424                                 return (NULL);
5425                         }
5426                         break;
5427                 case SCTP_PACKET_DROPPED:
5428                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5429                         /* re-get it all please */
5430                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5431                                 /* Its not ours */
5432                                 if (locked_tcb) {
5433                                         SCTP_TCB_UNLOCK(locked_tcb);
5434                                 }
5435                                 *offset = length;
5436                                 return (NULL);
5437                         }
5438                         if (ch && (stcb) && netp && (*netp)) {
5439                                 if (stcb->asoc.pktdrop_supported == 0) {
5440                                         goto unknown_chunk;
5441                                 }
5442                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5443                                     stcb, *netp,
5444                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5445
5446                         }
5447                         break;
5448                 case SCTP_AUTHENTICATION:
5449                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5450                         if (stcb == NULL) {
5451                                 /* save the first AUTH for later processing */
5452                                 if (auth_skipped == 0) {
5453                                         auth_offset = *offset;
5454                                         auth_len = chk_length;
5455                                         auth_skipped = 1;
5456                                 }
5457                                 /* skip this chunk (temporarily) */
5458                                 goto next_chunk;
5459                         }
5460                         if (stcb->asoc.auth_supported == 0) {
5461                                 goto unknown_chunk;
5462                         }
5463                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5464                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5465                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5466                                 /* Its not ours */
5467                                 if (locked_tcb) {
5468                                         SCTP_TCB_UNLOCK(locked_tcb);
5469                                 }
5470                                 *offset = length;
5471                                 return (NULL);
5472                         }
5473                         if (got_auth == 1) {
5474                                 /* skip this chunk... it's already auth'd */
5475                                 goto next_chunk;
5476                         }
5477                         got_auth = 1;
5478                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5479                             m, *offset)) {
5480                                 /* auth HMAC failed so dump the packet */
5481                                 *offset = length;
5482                                 return (stcb);
5483                         } else {
5484                                 /* remaining chunks are HMAC checked */
5485                                 stcb->asoc.authenticated = 1;
5486                         }
5487                         break;
5488
5489                 default:
5490         unknown_chunk:
5491                         /* it's an unknown chunk! */
5492                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5493                                 struct mbuf *mm;
5494                                 struct sctp_paramhdr *phd;
5495                                 int len;
5496
5497                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5498                                     0, M_NOWAIT, 1, MT_DATA);
5499                                 if (mm) {
5500                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5501                                         phd = mtod(mm, struct sctp_paramhdr *);
5502                                         /*
5503                                          * We cheat and use param type since
5504                                          * we did not bother to define a
5505                                          * error cause struct. They are the
5506                                          * same basic format with different
5507                                          * names.
5508                                          */
5509                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5510                                         phd->param_length = htons(len + sizeof(*phd));
5511                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5512                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5513                                         if (SCTP_BUF_NEXT(mm)) {
5514                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) {
5515                                                         sctp_m_freem(mm);
5516                                                 } else {
5517 #ifdef SCTP_MBUF_LOGGING
5518                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5519                                                                 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY);
5520                                                         }
5521 #endif
5522                                                         sctp_queue_op_err(stcb, mm);
5523                                                 }
5524                                         } else {
5525                                                 sctp_m_freem(mm);
5526                                         }
5527                                 }
5528                         }
5529                         if ((ch->chunk_type & 0x80) == 0) {
5530                                 /* discard this packet */
5531                                 *offset = length;
5532                                 return (stcb);
5533                         }       /* else skip this bad chunk and continue... */
5534                         break;
5535                 }               /* switch (ch->chunk_type) */
5536
5537
5538 next_chunk:
5539                 /* get the next chunk */
5540                 *offset += SCTP_SIZE32(chk_length);
5541                 if (*offset >= length) {
5542                         /* no more data left in the mbuf chain */
5543                         break;
5544                 }
5545                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5546                     sizeof(struct sctp_chunkhdr), chunk_buf);
5547                 if (ch == NULL) {
5548                         if (locked_tcb) {
5549                                 SCTP_TCB_UNLOCK(locked_tcb);
5550                         }
5551                         *offset = length;
5552                         return (NULL);
5553                 }
5554         }                       /* while */
5555
5556         if (asconf_cnt > 0 && stcb != NULL) {
5557                 sctp_send_asconf_ack(stcb);
5558         }
5559         return (stcb);
5560 }
5561
5562
5563 #ifdef INVARIANTS
5564 #ifdef __GNUC__
5565 __attribute__((noinline))
5566 #endif
5567         void
5568              sctp_validate_no_locks(struct sctp_inpcb *inp)
5569 {
5570         struct sctp_tcb *lstcb;
5571
5572         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5573                 if (mtx_owned(&lstcb->tcb_mtx)) {
5574                         panic("Own lock on stcb at return from input");
5575                 }
5576         }
5577         if (mtx_owned(&inp->inp_create_mtx)) {
5578                 panic("Own create lock on inp");
5579         }
5580         if (mtx_owned(&inp->inp_mtx)) {
5581                 panic("Own inp lock on inp");
5582         }
5583 }
5584
5585 #endif
5586
5587 /*
5588  * common input chunk processing (v4 and v6)
5589  */
5590 void
5591 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5592     struct sockaddr *src, struct sockaddr *dst,
5593     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5594 #if !defined(SCTP_WITH_NO_CSUM)
5595     uint8_t compute_crc,
5596 #endif
5597     uint8_t ecn_bits,
5598     uint8_t mflowtype, uint32_t mflowid,
5599     uint32_t vrf_id, uint16_t port)
5600 {
5601         uint32_t high_tsn;
5602         int fwd_tsn_seen = 0, data_processed = 0;
5603         struct mbuf *m = *mm, *op_err;
5604         char msg[SCTP_DIAG_INFO_LEN];
5605         int un_sent;
5606         int cnt_ctrl_ready = 0;
5607         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5608         struct sctp_tcb *stcb = NULL;
5609         struct sctp_nets *net = NULL;
5610
5611         SCTP_STAT_INCR(sctps_recvdatagrams);
5612 #ifdef SCTP_AUDITING_ENABLED
5613         sctp_audit_log(0xE0, 1);
5614         sctp_auditing(0, inp, stcb, net);
5615 #endif
5616 #if !defined(SCTP_WITH_NO_CSUM)
5617         if (compute_crc != 0) {
5618                 uint32_t check, calc_check;
5619
5620                 check = sh->checksum;
5621                 sh->checksum = 0;
5622                 calc_check = sctp_calculate_cksum(m, iphlen);
5623                 sh->checksum = check;
5624                 if (calc_check != check) {
5625                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5626                             calc_check, check, (void *)m, length, iphlen);
5627                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5628                             sh, ch, &inp, &net, vrf_id);
5629 #if defined(INET) || defined(INET6)
5630                         if ((net != NULL) && (port != 0)) {
5631                                 if (net->port == 0) {
5632                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5633                                 }
5634                                 net->port = port;
5635                         }
5636 #endif
5637                         if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
5638                                 net->flowtype = mflowtype;
5639                         }
5640                         if ((inp != NULL) && (stcb != NULL)) {
5641                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5642                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5643                         } else if ((inp != NULL) && (stcb == NULL)) {
5644                                 inp_decr = inp;
5645                         }
5646                         SCTP_STAT_INCR(sctps_badsum);
5647                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5648                         goto out;
5649                 }
5650         }
5651 #endif
5652         /* Destination port of 0 is illegal, based on RFC4960. */
5653         if (sh->dest_port == 0) {
5654                 SCTP_STAT_INCR(sctps_hdrops);
5655                 goto out;
5656         }
5657         stcb = sctp_findassociation_addr(m, offset, src, dst,
5658             sh, ch, &inp, &net, vrf_id);
5659 #if defined(INET) || defined(INET6)
5660         if ((net != NULL) && (port != 0)) {
5661                 if (net->port == 0) {
5662                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5663                 }
5664                 net->port = port;
5665         }
5666 #endif
5667         if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
5668                 net->flowtype = mflowtype;
5669         }
5670         if (inp == NULL) {
5671                 SCTP_STAT_INCR(sctps_noport);
5672                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5673                         goto out;
5674                 }
5675                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5676                         sctp_send_shutdown_complete2(src, dst, sh,
5677                             mflowtype, mflowid,
5678                             vrf_id, port);
5679                         goto out;
5680                 }
5681                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5682                         goto out;
5683                 }
5684                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5685                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5686                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5687                             (ch->chunk_type != SCTP_INIT))) {
5688                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5689                                     "Out of the blue");
5690                                 sctp_send_abort(m, iphlen, src, dst,
5691                                     sh, 0, op_err,
5692                                     mflowtype, mflowid,
5693                                     vrf_id, port);
5694                         }
5695                 }
5696                 goto out;
5697         } else if (stcb == NULL) {
5698                 inp_decr = inp;
5699         }
5700 #ifdef IPSEC
5701         /*-
5702          * I very much doubt any of the IPSEC stuff will work but I have no
5703          * idea, so I will leave it in place.
5704          */
5705         if (inp != NULL) {
5706                 switch (dst->sa_family) {
5707 #ifdef INET
5708                 case AF_INET:
5709                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5710                                 SCTP_STAT_INCR(sctps_hdrops);
5711                                 goto out;
5712                         }
5713                         break;
5714 #endif
5715 #ifdef INET6
5716                 case AF_INET6:
5717                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5718                                 SCTP_STAT_INCR(sctps_hdrops);
5719                                 goto out;
5720                         }
5721                         break;
5722 #endif
5723                 default:
5724                         break;
5725                 }
5726         }
5727 #endif
5728         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5729             (void *)m, iphlen, offset, length, (void *)stcb);
5730         if (stcb) {
5731                 /* always clear this before beginning a packet */
5732                 stcb->asoc.authenticated = 0;
5733                 stcb->asoc.seen_a_sack_this_pkt = 0;
5734                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5735                     (void *)stcb, stcb->asoc.state);
5736
5737                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5738                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5739                         /*-
5740                          * If we hit here, we had a ref count
5741                          * up when the assoc was aborted and the
5742                          * timer is clearing out the assoc, we should
5743                          * NOT respond to any packet.. its OOTB.
5744                          */
5745                         SCTP_TCB_UNLOCK(stcb);
5746                         stcb = NULL;
5747                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5748                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5749                             msg);
5750                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5751                             mflowtype, mflowid,
5752                             vrf_id, port);
5753                         goto out;
5754                 }
5755         }
5756         if (IS_SCTP_CONTROL(ch)) {
5757                 /* process the control portion of the SCTP packet */
5758                 /* sa_ignore NO_NULL_CHK */
5759                 stcb = sctp_process_control(m, iphlen, &offset, length,
5760                     src, dst, sh, ch,
5761                     inp, stcb, &net, &fwd_tsn_seen,
5762                     mflowtype, mflowid,
5763                     vrf_id, port);
5764                 if (stcb) {
5765                         /*
5766                          * This covers us if the cookie-echo was there and
5767                          * it changes our INP.
5768                          */
5769                         inp = stcb->sctp_ep;
5770 #if defined(INET) || defined(INET6)
5771                         if ((net) && (port)) {
5772                                 if (net->port == 0) {
5773                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5774                                 }
5775                                 net->port = port;
5776                         }
5777 #endif
5778                 }
5779         } else {
5780                 /*
5781                  * no control chunks, so pre-process DATA chunks (these
5782                  * checks are taken care of by control processing)
5783                  */
5784
5785                 /*
5786                  * if DATA only packet, and auth is required, then punt...
5787                  * can't have authenticated without any AUTH (control)
5788                  * chunks
5789                  */
5790                 if ((stcb != NULL) &&
5791                     (stcb->asoc.auth_supported == 1) &&
5792                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5793                         /* "silently" ignore */
5794                         SCTP_STAT_INCR(sctps_recvauthmissing);
5795                         goto out;
5796                 }
5797                 if (stcb == NULL) {
5798                         /* out of the blue DATA chunk */
5799                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5800                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5801                             msg);
5802                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5803                             mflowtype, mflowid,
5804                             vrf_id, port);
5805                         goto out;
5806                 }
5807                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5808                         /* v_tag mismatch! */
5809                         SCTP_STAT_INCR(sctps_badvtag);
5810                         goto out;
5811                 }
5812         }
5813
5814         if (stcb == NULL) {
5815                 /*
5816                  * no valid TCB for this packet, or we found it's a bad
5817                  * packet while processing control, or we're done with this
5818                  * packet (done or skip rest of data), so we drop it...
5819                  */
5820                 goto out;
5821         }
5822         /*
5823          * DATA chunk processing
5824          */
5825         /* plow through the data chunks while length > offset */
5826
5827         /*
5828          * Rest should be DATA only.  Check authentication state if AUTH for
5829          * DATA is required.
5830          */
5831         if ((length > offset) &&
5832             (stcb != NULL) &&
5833             (stcb->asoc.auth_supported == 1) &&
5834             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5835             !stcb->asoc.authenticated) {
5836                 /* "silently" ignore */
5837                 SCTP_STAT_INCR(sctps_recvauthmissing);
5838                 SCTPDBG(SCTP_DEBUG_AUTH1,
5839                     "Data chunk requires AUTH, skipped\n");
5840                 goto trigger_send;
5841         }
5842         if (length > offset) {
5843                 int retval;
5844
5845                 /*
5846                  * First check to make sure our state is correct. We would
5847                  * not get here unless we really did have a tag, so we don't
5848                  * abort if this happens, just dump the chunk silently.
5849                  */
5850                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5851                 case SCTP_STATE_COOKIE_ECHOED:
5852                         /*
5853                          * we consider data with valid tags in this state
5854                          * shows us the cookie-ack was lost. Imply it was
5855                          * there.
5856                          */
5857                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5858                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5859                                     stcb->asoc.overall_error_count,
5860                                     0,
5861                                     SCTP_FROM_SCTP_INPUT,
5862                                     __LINE__);
5863                         }
5864                         stcb->asoc.overall_error_count = 0;
5865                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5866                         break;
5867                 case SCTP_STATE_COOKIE_WAIT:
5868                         /*
5869                          * We consider OOTB any data sent during asoc setup.
5870                          */
5871                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5872                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5873                             msg);
5874                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5875                             mflowtype, mflowid,
5876                             vrf_id, port);
5877                         goto out;
5878                         /* sa_ignore NOTREACHED */
5879                         break;
5880                 case SCTP_STATE_EMPTY:  /* should not happen */
5881                 case SCTP_STATE_INUSE:  /* should not happen */
5882                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5883                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5884                 default:
5885                         goto out;
5886                         /* sa_ignore NOTREACHED */
5887                         break;
5888                 case SCTP_STATE_OPEN:
5889                 case SCTP_STATE_SHUTDOWN_SENT:
5890                         break;
5891                 }
5892                 /* plow through the data chunks while length > offset */
5893                 retval = sctp_process_data(mm, iphlen, &offset, length,
5894                     src, dst, sh,
5895                     inp, stcb, net, &high_tsn,
5896                     mflowtype, mflowid,
5897                     vrf_id, port);
5898                 if (retval == 2) {
5899                         /*
5900                          * The association aborted, NO UNLOCK needed since
5901                          * the association is destroyed.
5902                          */
5903                         stcb = NULL;
5904                         goto out;
5905                 }
5906                 data_processed = 1;
5907                 /*
5908                  * Anything important needs to have been m_copy'ed in
5909                  * process_data
5910                  */
5911         }
5912         /* take care of ecn */
5913         if ((data_processed == 1) &&
5914             (stcb->asoc.ecn_supported == 1) &&
5915             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5916                 /* Yep, we need to add a ECNE */
5917                 sctp_send_ecn_echo(stcb, net, high_tsn);
5918         }
5919         if ((data_processed == 0) && (fwd_tsn_seen)) {
5920                 int was_a_gap;
5921                 uint32_t highest_tsn;
5922
5923                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5924                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5925                 } else {
5926                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5927                 }
5928                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5929                 stcb->asoc.send_sack = 1;
5930                 sctp_sack_check(stcb, was_a_gap);
5931         } else if (fwd_tsn_seen) {
5932                 stcb->asoc.send_sack = 1;
5933         }
5934         /* trigger send of any chunks in queue... */
5935 trigger_send:
5936 #ifdef SCTP_AUDITING_ENABLED
5937         sctp_audit_log(0xE0, 2);
5938         sctp_auditing(1, inp, stcb, net);
5939 #endif
5940         SCTPDBG(SCTP_DEBUG_INPUT1,
5941             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5942             stcb->asoc.peers_rwnd,
5943             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5944             stcb->asoc.total_flight);
5945         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5946         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5947                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5948         }
5949         if (cnt_ctrl_ready ||
5950             ((un_sent) &&
5951             (stcb->asoc.peers_rwnd > 0 ||
5952             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5953                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5954                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5955                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5956         }
5957 #ifdef SCTP_AUDITING_ENABLED
5958         sctp_audit_log(0xE0, 3);
5959         sctp_auditing(2, inp, stcb, net);
5960 #endif
5961 out:
5962         if (stcb != NULL) {
5963                 SCTP_TCB_UNLOCK(stcb);
5964         }
5965         if (inp_decr != NULL) {
5966                 /* reduce ref-count */
5967                 SCTP_INP_WLOCK(inp_decr);
5968                 SCTP_INP_DECR_REF(inp_decr);
5969                 SCTP_INP_WUNLOCK(inp_decr);
5970         }
5971 #ifdef INVARIANTS
5972         if (inp != NULL) {
5973                 sctp_validate_no_locks(inp);
5974         }
5975 #endif
5976         return;
5977 }
5978
5979 #ifdef INET
5980 void
5981 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5982 {
5983         struct mbuf *m;
5984         int iphlen;
5985         uint32_t vrf_id = 0;
5986         uint8_t ecn_bits;
5987         struct sockaddr_in src, dst;
5988         struct ip *ip;
5989         struct sctphdr *sh;
5990         struct sctp_chunkhdr *ch;
5991         int length, offset;
5992
5993 #if !defined(SCTP_WITH_NO_CSUM)
5994         uint8_t compute_crc;
5995
5996 #endif
5997         uint32_t mflowid;
5998         uint8_t mflowtype;
5999
6000         iphlen = off;
6001         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6002                 SCTP_RELEASE_PKT(i_pak);
6003                 return;
6004         }
6005         m = SCTP_HEADER_TO_CHAIN(i_pak);
6006 #ifdef SCTP_MBUF_LOGGING
6007         /* Log in any input mbufs */
6008         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6009                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6010         }
6011 #endif
6012 #ifdef SCTP_PACKET_LOGGING
6013         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6014                 sctp_packet_log(m);
6015         }
6016 #endif
6017         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6018             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6019             m->m_pkthdr.len,
6020             if_name(m->m_pkthdr.rcvif),
6021             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6022         mflowid = m->m_pkthdr.flowid;
6023         mflowtype = M_HASHTYPE_GET(m);
6024         SCTP_STAT_INCR(sctps_recvpackets);
6025         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6026         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6027         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6028         if (SCTP_BUF_LEN(m) < offset) {
6029                 if ((m = m_pullup(m, offset)) == NULL) {
6030                         SCTP_STAT_INCR(sctps_hdrops);
6031                         return;
6032                 }
6033         }
6034         ip = mtod(m, struct ip *);
6035         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6036         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6037         offset -= sizeof(struct sctp_chunkhdr);
6038         memset(&src, 0, sizeof(struct sockaddr_in));
6039         src.sin_family = AF_INET;
6040         src.sin_len = sizeof(struct sockaddr_in);
6041         src.sin_port = sh->src_port;
6042         src.sin_addr = ip->ip_src;
6043         memset(&dst, 0, sizeof(struct sockaddr_in));
6044         dst.sin_family = AF_INET;
6045         dst.sin_len = sizeof(struct sockaddr_in);
6046         dst.sin_port = sh->dest_port;
6047         dst.sin_addr = ip->ip_dst;
6048         length = ntohs(ip->ip_len);
6049         /* Validate mbuf chain length with IP payload length. */
6050         if (SCTP_HEADER_LEN(m) != length) {
6051                 SCTPDBG(SCTP_DEBUG_INPUT1,
6052                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6053                 SCTP_STAT_INCR(sctps_hdrops);
6054                 goto out;
6055         }
6056         /* SCTP does not allow broadcasts or multicasts */
6057         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6058                 goto out;
6059         }
6060         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6061                 goto out;
6062         }
6063         ecn_bits = ip->ip_tos;
6064 #if defined(SCTP_WITH_NO_CSUM)
6065         SCTP_STAT_INCR(sctps_recvnocrc);
6066 #else
6067         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6068                 SCTP_STAT_INCR(sctps_recvhwcrc);
6069                 compute_crc = 0;
6070         } else {
6071                 SCTP_STAT_INCR(sctps_recvswcrc);
6072                 compute_crc = 1;
6073         }
6074 #endif
6075         sctp_common_input_processing(&m, iphlen, offset, length,
6076             (struct sockaddr *)&src,
6077             (struct sockaddr *)&dst,
6078             sh, ch,
6079 #if !defined(SCTP_WITH_NO_CSUM)
6080             compute_crc,
6081 #endif
6082             ecn_bits,
6083             mflowtype, mflowid,
6084             vrf_id, port);
6085 out:
6086         if (m) {
6087                 sctp_m_freem(m);
6088         }
6089         return;
6090 }
6091
6092 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6093 extern int *sctp_cpuarry;
6094
6095 #endif
6096
6097 int
6098 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6099 {
6100         struct mbuf *m;
6101         int off;
6102
6103         m = *mp;
6104         off = *offp;
6105 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6106         if (mp_ncpus > 1) {
6107                 struct ip *ip;
6108                 struct sctphdr *sh;
6109                 int offset;
6110                 int cpu_to_use;
6111                 uint32_t flowid, tag;
6112
6113                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6114                         flowid = m->m_pkthdr.flowid;
6115                 } else {
6116                         /*
6117                          * No flow id built by lower layers fix it so we
6118                          * create one.
6119                          */
6120                         offset = off + sizeof(struct sctphdr);
6121                         if (SCTP_BUF_LEN(m) < offset) {
6122                                 if ((m = m_pullup(m, offset)) == NULL) {
6123                                         SCTP_STAT_INCR(sctps_hdrops);
6124                                         return (IPPROTO_DONE);
6125                                 }
6126                         }
6127                         ip = mtod(m, struct ip *);
6128                         sh = (struct sctphdr *)((caddr_t)ip + off);
6129                         tag = htonl(sh->v_tag);
6130                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6131                         m->m_pkthdr.flowid = flowid;
6132                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6133                 }
6134                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6135                 sctp_queue_to_mcore(m, off, cpu_to_use);
6136                 return (IPPROTO_DONE);
6137         }
6138 #endif
6139         sctp_input_with_port(m, off, 0);
6140         return (IPPROTO_DONE);
6141 }
6142
6143 #endif