sys/netinet/sctp_input.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <netinet/sctp_var.h>
  40 #include <netinet/sctp_sysctl.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctputil.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_input.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_bsd_addr.h>
  50 #include <netinet/sctp_timer.h>
  51 #include <netinet/sctp_crc32.h>
  52 #include <netinet/sctp_kdtrace.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <sys/smp.h>
  57
  58 static void
  59 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  60 {
  61         struct sctp_nets *net;
  62
  63         /*
  64          * This now not only stops all cookie timers it also stops any INIT
  65          * timers as well. This will make sure that the timers are stopped
  66          * in all collision cases.
  67          */
  68         SCTP_TCB_LOCK_ASSERT(stcb);
  69         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  70                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  71                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  72                             stcb->sctp_ep,
  73                             stcb,
  74                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  75                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  76                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  77                             stcb->sctp_ep,
  78                             stcb,
  79                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  80                 }
  81         }
  82 }
  83
  84 /* INIT handler */
  85 static void
  86 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  87     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  88     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  89     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  90     uint8_t mflowtype, uint32_t mflowid,
  91     uint32_t vrf_id, uint16_t port)
  92 {
  93         struct sctp_init *init;
  94         struct mbuf *op_err;
  95
  96         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  97             (void *)stcb);
  98         if (stcb == NULL) {
  99                 SCTP_INP_RLOCK(inp);
 100         }
 101         /* Validate parameters */
 102         init = &cp->init;
 103         if ((ntohl(init->initiate_tag) == 0) ||
 104             (ntohl(init->a_rwnd) < SCTP_MIN_RWND) ||
 105             (ntohs(init->num_inbound_streams) == 0) ||
 106             (ntohs(init->num_outbound_streams) == 0)) {
 107                 /* protocol error... send abort */
 108                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 109                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 110                     mflowtype, mflowid,
 111                     vrf_id, port);
 112                 if (stcb)
 113                         *abort_no_unlock = 1;
 114                 goto outnow;
 115         }
 116         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 117             offset + ntohs(cp->ch.chunk_length))) {
 118                 /* auth parameter(s) error... send abort */
 119                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 120                     "Problem with AUTH parameters");
 121                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 122                     mflowtype, mflowid,
 123                     vrf_id, port);
 124                 if (stcb)
 125                         *abort_no_unlock = 1;
 126                 goto outnow;
 127         }
 128         /* We are only accepting if we have a listening socket. */
 129         if ((stcb == NULL) &&
 130             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 131             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 132             (!SCTP_IS_LISTENING(inp)))) {
 133                 /*
 134                  * FIX ME ?? What about TCP model and we have a
 135                  * match/restart case? Actually no fix is needed. the lookup
 136                  * will always find the existing assoc so stcb would not be
 137                  * NULL. It may be questionable to do this since we COULD
 138                  * just send back the INIT-ACK and hope that the app did
 139                  * accept()'s by the time the COOKIE was sent. But there is
 140                  * a price to pay for COOKIE generation and I don't want to
 141                  * pay it on the chance that the app will actually do some
 142                  * accepts(). The App just looses and should NOT be in this
 143                  * state :-)
 144                  */
 145                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 146                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 147                             "No listener");
 148                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 149                             mflowtype, mflowid, inp->fibnum,
 150                             vrf_id, port);
 151                 }
 152                 goto outnow;
 153         }
 154         if ((stcb != NULL) &&
 155             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 156                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 157                 sctp_send_shutdown_ack(stcb, NULL);
 158                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 159         } else {
 160                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 161                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 162                     src, dst, sh, cp,
 163                     mflowtype, mflowid,
 164                     vrf_id, port);
 165         }
 166 outnow:
 167         if (stcb == NULL) {
 168                 SCTP_INP_RUNLOCK(inp);
 169         }
 170 }
 171
 172 /*
 173  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 174  */
 175
 176 int
 177 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked)
 178 {
 179         int unsent_data;
 180         unsigned int i;
 181         struct sctp_stream_queue_pending *sp;
 182         struct sctp_association *asoc;
 183
 184         /*
 185          * This function returns if any stream has true unsent data on it.
 186          * Note that as it looks through it will clean up any places that
 187          * have old data that has been sent but left at top of stream queue.
 188          */
 189         asoc = &stcb->asoc;
 190         unsent_data = 0;
 191         SCTP_TCB_SEND_LOCK(stcb);
 192         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 193                 /* Check to see if some data queued */
 194                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 195                         /* sa_ignore FREED_MEMORY */
 196                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 197                         if (sp == NULL) {
 198                                 continue;
 199                         }
 200                         if ((sp->msg_is_complete) &&
 201                             (sp->length == 0) &&
 202                             (sp->sender_all_done)) {
 203                                 /*
 204                                  * We are doing differed cleanup. Last time
 205                                  * through when we took all the data the
 206                                  * sender_all_done was not set.
 207                                  */
 208                                 if (sp->put_last_out == 0) {
 209                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 210                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 211                                             sp->sender_all_done,
 212                                             sp->length,
 213                                             sp->msg_is_complete,
 214                                             sp->put_last_out);
 215                                 }
 216                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 217                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 218                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
 219                                 if (sp->net) {
 220                                         sctp_free_remote_addr(sp->net);
 221                                         sp->net = NULL;
 222                                 }
 223                                 if (sp->data) {
 224                                         sctp_m_freem(sp->data);
 225                                         sp->data = NULL;
 226                                 }
 227                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 228                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 229                                         unsent_data++;
 230                                 }
 231                         } else {
 232                                 unsent_data++;
 233                         }
 234                         if (unsent_data > 0) {
 235                                 break;
 236                         }
 237                 }
 238         }
 239         SCTP_TCB_SEND_UNLOCK(stcb);
 240         return (unsent_data);
 241 }
 242
 243 static int
 244 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 245 {
 246         struct sctp_init *init;
 247         struct sctp_association *asoc;
 248         struct sctp_nets *lnet;
 249         unsigned int i;
 250
 251         init = &cp->init;
 252         asoc = &stcb->asoc;
 253         /* save off parameters */
 254         asoc->peer_vtag = ntohl(init->initiate_tag);
 255         asoc->peers_rwnd = ntohl(init->a_rwnd);
 256         /* init tsn's */
 257         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 258
 259         if (!TAILQ_EMPTY(&asoc->nets)) {
 260                 /* update any ssthresh's that may have a default */
 261                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 262                         lnet->ssthresh = asoc->peers_rwnd;
 263                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 264                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 265                         }
 266                 }
 267         }
 268         SCTP_TCB_SEND_LOCK(stcb);
 269         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 270                 unsigned int newcnt;
 271                 struct sctp_stream_out *outs;
 272                 struct sctp_stream_queue_pending *sp, *nsp;
 273                 struct sctp_tmit_chunk *chk, *nchk;
 274
 275                 /* abandon the upper streams */
 276                 newcnt = ntohs(init->num_inbound_streams);
 277                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 278                         if (chk->rec.data.sid >= newcnt) {
 279                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 280                                 asoc->send_queue_cnt--;
 281                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 282                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 283 #ifdef INVARIANTS
 284                                 } else {
 285                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 286 #endif
 287                                 }
 288                                 if (chk->data != NULL) {
 289                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 290                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 291                                             0, chk, SCTP_SO_NOT_LOCKED);
 292                                         if (chk->data) {
 293                                                 sctp_m_freem(chk->data);
 294                                                 chk->data = NULL;
 295                                         }
 296                                 }
 297                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 298                                 /* sa_ignore FREED_MEMORY */
 299                         }
 300                 }
 301                 if (asoc->strmout) {
 302                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 303                                 outs = &asoc->strmout[i];
 304                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 305                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 306                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 307                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
 308                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 309                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 310                                         if (sp->data) {
 311                                                 sctp_m_freem(sp->data);
 312                                                 sp->data = NULL;
 313                                         }
 314                                         if (sp->net) {
 315                                                 sctp_free_remote_addr(sp->net);
 316                                                 sp->net = NULL;
 317                                         }
 318                                         /* Free the chunk */
 319                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 320                                         /* sa_ignore FREED_MEMORY */
 321                                 }
 322                                 outs->state = SCTP_STREAM_CLOSED;
 323                         }
 324                 }
 325                 /* cut back the count */
 326                 asoc->pre_open_streams = newcnt;
 327         }
 328         SCTP_TCB_SEND_UNLOCK(stcb);
 329         asoc->streamoutcnt = asoc->pre_open_streams;
 330         if (asoc->strmout) {
 331                 for (i = 0; i < asoc->streamoutcnt; i++) {
 332                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 333                 }
 334         }
 335         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 336         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 337         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 338                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 339         }
 340         /* This is the next one we expect */
 341         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 342
 343         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 344         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 345
 346         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 347         /* open the requested streams */
 348
 349         if (asoc->strmin != NULL) {
 350                 /* Free the old ones */
 351                 for (i = 0; i < asoc->streamincnt; i++) {
 352                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 353                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 354                 }
 355                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 356         }
 357         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 358                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 359         } else {
 360                 asoc->streamincnt = asoc->max_inbound_streams;
 361         }
 362         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 363             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 364         if (asoc->strmin == NULL) {
 365                 /* we didn't get memory for the streams! */
 366                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 367                 return (-1);
 368         }
 369         for (i = 0; i < asoc->streamincnt; i++) {
 370                 asoc->strmin[i].sid = i;
 371                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 372                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 373                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 374                 asoc->strmin[i].pd_api_started = 0;
 375                 asoc->strmin[i].delivery_started = 0;
 376         }
 377         /*
 378          * load_address_from_init will put the addresses into the
 379          * association when the COOKIE is processed or the INIT-ACK is
 380          * processed. Both types of COOKIE's existing and new call this
 381          * routine. It will remove addresses that are no longer in the
 382          * association (for the restarting case where addresses are
 383          * removed). Up front when the INIT arrives we will discard it if it
 384          * is a restart and new addresses have been added.
 385          */
 386         /* sa_ignore MEMLEAK */
 387         return (0);
 388 }
 389
 390 /*
 391  * INIT-ACK message processing/consumption returns value < 0 on error
 392  */
 393 static int
 394 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 395     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 396     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 397     struct sctp_nets *net, int *abort_no_unlock,
 398     uint8_t mflowtype, uint32_t mflowid,
 399     uint32_t vrf_id)
 400 {
 401         struct sctp_association *asoc;
 402         struct mbuf *op_err;
 403         int retval, abort_flag, cookie_found;
 404         int initack_limit;
 405         int nat_friendly = 0;
 406
 407         /* First verify that we have no illegal param's */
 408         abort_flag = 0;
 409         cookie_found = 0;
 410
 411         op_err = sctp_arethere_unrecognized_parameters(m,
 412             (offset + sizeof(struct sctp_init_chunk)),
 413             &abort_flag, (struct sctp_chunkhdr *)cp,
 414             &nat_friendly, &cookie_found);
 415         if (abort_flag) {
 416                 /* Send an abort and notify peer */
 417                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 418                 *abort_no_unlock = 1;
 419                 return (-1);
 420         }
 421         if (!cookie_found) {
 422                 uint16_t len;
 423
 424                 /* Only report the missing cookie parameter */
 425                 if (op_err != NULL) {
 426                         sctp_m_freem(op_err);
 427                 }
 428                 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 429                 /* We abort with an error of missing mandatory param */
 430                 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 431                 if (op_err != NULL) {
 432                         struct sctp_error_missing_param *cause;
 433
 434                         SCTP_BUF_LEN(op_err) = len;
 435                         cause = mtod(op_err, struct sctp_error_missing_param *);
 436                         /* Subtract the reserved param */
 437                         cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 438                         cause->cause.length = htons(len);
 439                         cause->num_missing_params = htonl(1);
 440                         cause->type[0] = htons(SCTP_STATE_COOKIE);
 441                 }
 442                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 443                     src, dst, sh, op_err,
 444                     mflowtype, mflowid,
 445                     vrf_id, net->port);
 446                 *abort_no_unlock = 1;
 447                 return (-3);
 448         }
 449         asoc = &stcb->asoc;
 450         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 451         /* process the peer's parameters in the INIT-ACK */
 452         if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) {
 453                 if (op_err != NULL) {
 454                         sctp_m_freem(op_err);
 455                 }
 456                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 457                 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
 458                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 459                     src, dst, sh, op_err,
 460                     mflowtype, mflowid,
 461                     vrf_id, net->port);
 462                 *abort_no_unlock = 1;
 463                 return (-1);
 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),
 469             initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) {
 470                 if (op_err != NULL) {
 471                         sctp_m_freem(op_err);
 472                 }
 473                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 474                     "Problem with address parameters");
 475                 SCTPDBG(SCTP_DEBUG_INPUT1,
 476                     "Load addresses from INIT causes an abort %d\n",
 477                     retval);
 478                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 479                     src, dst, sh, op_err,
 480                     mflowtype, mflowid,
 481                     vrf_id, net->port);
 482                 *abort_no_unlock = 1;
 483                 return (-1);
 484         }
 485         /* if the peer doesn't support asconf, flush the asconf queue */
 486         if (asoc->asconf_supported == 0) {
 487                 struct sctp_asconf_addr *param, *nparam;
 488
 489                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 490                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 491                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 492                 }
 493         }
 494
 495         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 496             stcb->asoc.local_hmacs);
 497         if (op_err) {
 498                 sctp_queue_op_err(stcb, op_err);
 499                 /* queuing will steal away the mbuf chain to the out queue */
 500                 op_err = NULL;
 501         }
 502         /* extract the cookie and queue it to "echo" it back... */
 503         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 504                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 505                     stcb->asoc.overall_error_count,
 506                     0,
 507                     SCTP_FROM_SCTP_INPUT,
 508                     __LINE__);
 509         }
 510         stcb->asoc.overall_error_count = 0;
 511         net->error_count = 0;
 512
 513         /*
 514          * Cancel the INIT timer, We do this first before queueing the
 515          * cookie. We always cancel at the primary to assue that we are
 516          * canceling the timer started by the INIT which always goes to the
 517          * primary.
 518          */
 519         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 520             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 521
 522         /* calculate the RTO */
 523         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 524             SCTP_RTT_FROM_NON_DATA);
 525         retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
 526         return (retval);
 527 }
 528
 529 static void
 530 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 531     struct sctp_tcb *stcb, struct sctp_nets *net)
 532 {
 533         union sctp_sockstore store;
 534         struct sctp_nets *r_net, *f_net;
 535         struct timeval tv;
 536         int req_prim = 0;
 537         uint16_t old_error_counter;
 538
 539         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 540                 /* Invalid length */
 541                 return;
 542         }
 543
 544         memset(&store, 0, sizeof(store));
 545         switch (cp->heartbeat.hb_info.addr_family) {
 546 #ifdef INET
 547         case AF_INET:
 548                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 549                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 550                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 551                         store.sin.sin_port = stcb->rport;
 552                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 553                             sizeof(store.sin.sin_addr));
 554                 } else {
 555                         return;
 556                 }
 557                 break;
 558 #endif
 559 #ifdef INET6
 560         case AF_INET6:
 561                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 562                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 563                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 564                         store.sin6.sin6_port = stcb->rport;
 565                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 566                 } else {
 567                         return;
 568                 }
 569                 break;
 570 #endif
 571         default:
 572                 return;
 573         }
 574         r_net = sctp_findnet(stcb, &store.sa);
 575         if (r_net == NULL) {
 576                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 577                 return;
 578         }
 579         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 580             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 581             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 582                 /*
 583                  * If the its a HB and it's random value is correct when can
 584                  * confirm the destination.
 585                  */
 586                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 587                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 588                         stcb->asoc.primary_destination = r_net;
 589                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 590                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 591                         if (f_net != r_net) {
 592                                 /*
 593                                  * first one on the list is NOT the primary
 594                                  * sctp_cmpaddr() is much more efficient if
 595                                  * the primary is the first on the list,
 596                                  * make it so.
 597                                  */
 598                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 599                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 600                         }
 601                         req_prim = 1;
 602                 }
 603                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 604                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 605                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 606                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 607                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 608         }
 609         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 610                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 611                     stcb->asoc.overall_error_count,
 612                     0,
 613                     SCTP_FROM_SCTP_INPUT,
 614                     __LINE__);
 615         }
 616         stcb->asoc.overall_error_count = 0;
 617         old_error_counter = r_net->error_count;
 618         r_net->error_count = 0;
 619         r_net->hb_responded = 1;
 620         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 621         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 622         /* Now lets do a RTO with this */
 623         sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
 624             SCTP_RTT_FROM_NON_DATA);
 625         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 626                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 627                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 628                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 629         }
 630         if (r_net->dest_state & SCTP_ADDR_PF) {
 631                 r_net->dest_state &= ~SCTP_ADDR_PF;
 632                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 633         }
 634         if (old_error_counter > 0) {
 635                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 636                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 637                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 638         }
 639         if (r_net == stcb->asoc.primary_destination) {
 640                 if (stcb->asoc.alternate) {
 641                         /* release the alternate, primary is good */
 642                         sctp_free_remote_addr(stcb->asoc.alternate);
 643                         stcb->asoc.alternate = NULL;
 644                 }
 645         }
 646         /* Mobility adaptation */
 647         if (req_prim) {
 648                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 649                     SCTP_MOBILITY_BASE) ||
 650                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 651                     SCTP_MOBILITY_FASTHANDOFF)) &&
 652                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 653                     SCTP_MOBILITY_PRIM_DELETED)) {
 654                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 655                             stcb->sctp_ep, stcb, NULL,
 656                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 657                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 658                             SCTP_MOBILITY_FASTHANDOFF)) {
 659                                 sctp_assoc_immediate_retrans(stcb,
 660                                     stcb->asoc.primary_destination);
 661                         }
 662                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 663                             SCTP_MOBILITY_BASE)) {
 664                                 sctp_move_chunks_from_net(stcb,
 665                                     stcb->asoc.deleted_primary);
 666                         }
 667                         sctp_delete_prim_timer(stcb->sctp_ep, stcb);
 668                 }
 669         }
 670 }
 671
 672 static int
 673 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 674 {
 675         /*
 676          * Return 0 means we want you to proceed with the abort non-zero
 677          * means no abort processing.
 678          */
 679         uint32_t new_vtag;
 680         struct sctpasochead *head;
 681
 682         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 683             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 684                 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 685                 atomic_add_int(&stcb->asoc.refcnt, 1);
 686                 SCTP_TCB_UNLOCK(stcb);
 687                 SCTP_INP_INFO_WLOCK();
 688                 SCTP_TCB_LOCK(stcb);
 689                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 690         } else {
 691                 return (0);
 692         }
 693         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
 694                 /* generate a new vtag and send init */
 695                 LIST_REMOVE(stcb, sctp_asocs);
 696                 stcb->asoc.my_vtag = new_vtag;
 697                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 698                 /*
 699                  * put it in the bucket in the vtag hash of assoc's for the
 700                  * system
 701                  */
 702                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 703                 SCTP_INP_INFO_WUNLOCK();
 704                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 705                 return (1);
 706         } else {
 707                 /*
 708                  * treat like a case where the cookie expired i.e.: - dump
 709                  * current cookie. - generate a new vtag. - resend init.
 710                  */
 711                 /* generate a new vtag and send init */
 712                 LIST_REMOVE(stcb, sctp_asocs);
 713                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 714                 sctp_stop_all_cookie_timers(stcb);
 715                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 716                 stcb->asoc.my_vtag = new_vtag;
 717                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 718                 /*
 719                  * put it in the bucket in the vtag hash of assoc's for the
 720                  * system
 721                  */
 722                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 723                 SCTP_INP_INFO_WUNLOCK();
 724                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 725                 return (1);
 726         }
 727         return (0);
 728 }
 729
 730 static int
 731 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 732     struct sctp_nets *net)
 733 {
 734         /*
 735          * return 0 means we want you to proceed with the abort non-zero
 736          * means no abort processing
 737          */
 738         if (stcb->asoc.auth_supported == 0) {
 739                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 740                 return (0);
 741         }
 742         sctp_asconf_send_nat_state_update(stcb, net);
 743         return (1);
 744 }
 745
 746 /* Returns 1 if the stcb was aborted, 0 otherwise */
 747 static int
 748 sctp_handle_abort(struct sctp_abort_chunk *abort,
 749     struct sctp_tcb *stcb, struct sctp_nets *net)
 750 {
 751         uint16_t len;
 752         uint16_t error;
 753
 754         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 755         if (stcb == NULL)
 756                 return (0);
 757
 758         len = ntohs(abort->ch.chunk_length);
 759         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
 760                 /*
 761                  * Need to check the cause codes for our two magic nat
 762                  * aborts which don't kill the assoc necessarily.
 763                  */
 764                 struct sctp_error_cause *cause;
 765
 766                 cause = (struct sctp_error_cause *)(abort + 1);
 767                 error = ntohs(cause->code);
 768                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 769                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n",
 770                             abort->ch.chunk_flags);
 771                         if (sctp_handle_nat_colliding_state(stcb)) {
 772                                 return (0);
 773                         }
 774                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 775                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n",
 776                             abort->ch.chunk_flags);
 777                         if (sctp_handle_nat_missing_state(stcb, net)) {
 778                                 return (0);
 779                         }
 780                 }
 781         } else {
 782                 error = 0;
 783         }
 784         /* stop any receive timers */
 785         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
 786             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 787         /* notify user of the abort and clean up... */
 788         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 789         /* free the tcb */
 790         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 791         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 792             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 793                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 794         }
 795 #ifdef SCTP_ASOCLOG_OF_TSNS
 796         sctp_print_out_track_log(stcb);
 797 #endif
 798         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 799             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 800         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 801         return (1);
 802 }
 803
 804 static void
 805 sctp_start_net_timers(struct sctp_tcb *stcb)
 806 {
 807         uint32_t cnt_hb_sent;
 808         struct sctp_nets *net;
 809
 810         cnt_hb_sent = 0;
 811         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 812                 /*
 813                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 814                  * If the dest in unconfirmed send a hb as well if under
 815                  * max_hb_burst have been sent.
 816                  */
 817                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 818                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 819                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 820                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 821                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 822                         cnt_hb_sent++;
 823                 }
 824         }
 825         if (cnt_hb_sent) {
 826                 sctp_chunk_output(stcb->sctp_ep, stcb,
 827                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 828                     SCTP_SO_NOT_LOCKED);
 829         }
 830 }
 831
 832 static void
 833 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 834     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 835 {
 836         struct sctp_association *asoc;
 837         int some_on_streamwheel;
 838         int old_state;
 839
 840         SCTPDBG(SCTP_DEBUG_INPUT2,
 841             "sctp_handle_shutdown: handling SHUTDOWN\n");
 842         if (stcb == NULL)
 843                 return;
 844         asoc = &stcb->asoc;
 845         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 846             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 847                 return;
 848         }
 849         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 850                 /* Shutdown NOT the expected size */
 851                 return;
 852         }
 853         old_state = SCTP_GET_STATE(stcb);
 854         sctp_update_acked(stcb, cp, abort_flag);
 855         if (*abort_flag) {
 856                 return;
 857         }
 858         if (asoc->control_pdapi) {
 859                 /*
 860                  * With a normal shutdown we assume the end of last record.
 861                  */
 862                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 863                 if (asoc->control_pdapi->on_strm_q) {
 864                         struct sctp_stream_in *strm;
 865
 866                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 867                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 868                                 /* Unordered */
 869                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 870                                 asoc->control_pdapi->on_strm_q = 0;
 871                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 872                                 /* Ordered */
 873                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 874                                 asoc->control_pdapi->on_strm_q = 0;
 875 #ifdef INVARIANTS
 876                         } else {
 877                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 878                                     asoc->control_pdapi,
 879                                     asoc->control_pdapi->on_strm_q);
 880 #endif
 881                         }
 882                 }
 883                 asoc->control_pdapi->end_added = 1;
 884                 asoc->control_pdapi->pdapi_aborted = 1;
 885                 asoc->control_pdapi = NULL;
 886                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 887                 if (stcb->sctp_socket) {
 888                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 889                 }
 890         }
 891         /* goto SHUTDOWN_RECEIVED state to block new requests */
 892         if (stcb->sctp_socket) {
 893                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 894                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 895                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
 896                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
 897                         /*
 898                          * notify upper layer that peer has initiated a
 899                          * shutdown
 900                          */
 901                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 902
 903                         /* reset time */
 904                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 905                 }
 906         }
 907         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
 908                 /*
 909                  * stop the shutdown timer, since we WILL move to
 910                  * SHUTDOWN-ACK-SENT.
 911                  */
 912                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 913                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 914         }
 915         /* Now is there unsent data on a stream somewhere? */
 916         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 917
 918         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 919             !TAILQ_EMPTY(&asoc->sent_queue) ||
 920             some_on_streamwheel) {
 921                 /* By returning we will push more data out */
 922                 return;
 923         } else {
 924                 /* no outstanding data to send, so move on... */
 925                 /* send SHUTDOWN-ACK */
 926                 /* move to SHUTDOWN-ACK-SENT state */
 927                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 928                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 929                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 930                 }
 931                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 932                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
 933                         sctp_stop_timers_for_shutdown(stcb);
 934                         sctp_send_shutdown_ack(stcb, net);
 935                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 936                             stcb->sctp_ep, stcb, net);
 937                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 938                         sctp_send_shutdown_ack(stcb, net);
 939                 }
 940         }
 941 }
 942
 943 static void
 944 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 945     struct sctp_tcb *stcb,
 946     struct sctp_nets *net)
 947 {
 948         struct sctp_association *asoc;
 949
 950         SCTPDBG(SCTP_DEBUG_INPUT2,
 951             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 952         if (stcb == NULL)
 953                 return;
 954
 955         asoc = &stcb->asoc;
 956         /* process according to association state */
 957         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 958             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 959                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 960                 sctp_send_shutdown_complete(stcb, net, 1);
 961                 SCTP_TCB_UNLOCK(stcb);
 962                 return;
 963         }
 964         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
 965             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 966                 /* unexpected SHUTDOWN-ACK... so ignore... */
 967                 SCTP_TCB_UNLOCK(stcb);
 968                 return;
 969         }
 970         if (asoc->control_pdapi) {
 971                 /*
 972                  * With a normal shutdown we assume the end of last record.
 973                  */
 974                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 975                 asoc->control_pdapi->end_added = 1;
 976                 asoc->control_pdapi->pdapi_aborted = 1;
 977                 asoc->control_pdapi = NULL;
 978                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 979                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 980         }
 981 #ifdef INVARIANTS
 982         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 983             !TAILQ_EMPTY(&asoc->sent_queue) ||
 984             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
 985                 panic("Queues are not empty when handling SHUTDOWN-ACK");
 986         }
 987 #endif
 988         /* stop the timer */
 989         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
 990             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
 991         /* send SHUTDOWN-COMPLETE */
 992         sctp_send_shutdown_complete(stcb, net, 0);
 993         /* notify upper layer protocol */
 994         if (stcb->sctp_socket) {
 995                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 996                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 997                         stcb->sctp_socket->so_snd.sb_cc = 0;
 998                 }
 999                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1000         }
1001         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1002         /* free the TCB but first save off the ep */
1003         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1004             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1005 }
1006
1007 static void
1008 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
1009 {
1010         switch (chunk_type) {
1011         case SCTP_ASCONF_ACK:
1012         case SCTP_ASCONF:
1013                 sctp_asconf_cleanup(stcb);
1014                 break;
1015         case SCTP_IFORWARD_CUM_TSN:
1016         case SCTP_FORWARD_CUM_TSN:
1017                 stcb->asoc.prsctp_supported = 0;
1018                 break;
1019         default:
1020                 SCTPDBG(SCTP_DEBUG_INPUT2,
1021                     "Peer does not support chunk type %d (0x%x).\n",
1022                     chunk_type, chunk_type);
1023                 break;
1024         }
1025 }
1026
1027 /*
1028  * Skip past the param header and then we will find the param that caused the
1029  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1030  * these will turn of specific features.
1031  * XXX: Is this the right thing to do?
1032  */
1033 static void
1034 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1035 {
1036         switch (parameter_type) {
1037                 /* pr-sctp draft */
1038         case SCTP_PRSCTP_SUPPORTED:
1039                 stcb->asoc.prsctp_supported = 0;
1040                 break;
1041         case SCTP_SUPPORTED_CHUNK_EXT:
1042                 break;
1043                 /* draft-ietf-tsvwg-addip-sctp */
1044         case SCTP_HAS_NAT_SUPPORT:
1045                 stcb->asoc.peer_supports_nat = 0;
1046                 break;
1047         case SCTP_ADD_IP_ADDRESS:
1048         case SCTP_DEL_IP_ADDRESS:
1049         case SCTP_SET_PRIM_ADDR:
1050                 stcb->asoc.asconf_supported = 0;
1051                 break;
1052         case SCTP_SUCCESS_REPORT:
1053         case SCTP_ERROR_CAUSE_IND:
1054                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1055                 SCTPDBG(SCTP_DEBUG_INPUT2,
1056                     "Turning off ASCONF to this strange peer\n");
1057                 stcb->asoc.asconf_supported = 0;
1058                 break;
1059         default:
1060                 SCTPDBG(SCTP_DEBUG_INPUT2,
1061                     "Peer does not support param type %d (0x%x)??\n",
1062                     parameter_type, parameter_type);
1063                 break;
1064         }
1065 }
1066
1067 static int
1068 sctp_handle_error(struct sctp_chunkhdr *ch,
1069     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1070 {
1071         struct sctp_error_cause *cause;
1072         struct sctp_association *asoc;
1073         uint32_t remaining_length, adjust;
1074         uint16_t code, cause_code, cause_length;
1075
1076         /* parse through all of the errors and process */
1077         asoc = &stcb->asoc;
1078         cause = (struct sctp_error_cause *)((caddr_t)ch +
1079             sizeof(struct sctp_chunkhdr));
1080         remaining_length = ntohs(ch->chunk_length);
1081         if (remaining_length > limit) {
1082                 remaining_length = limit;
1083         }
1084         if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1085                 remaining_length -= sizeof(struct sctp_chunkhdr);
1086         } else {
1087                 remaining_length = 0;
1088         }
1089         code = 0;
1090         while (remaining_length >= sizeof(struct sctp_error_cause)) {
1091                 /* Process an Error Cause */
1092                 cause_code = ntohs(cause->code);
1093                 cause_length = ntohs(cause->length);
1094                 if ((cause_length > remaining_length) || (cause_length == 0)) {
1095                         /* Invalid cause length, possibly due to truncation. */
1096                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1097                             remaining_length, cause_length);
1098                         return (0);
1099                 }
1100                 if (code == 0) {
1101                         /* report the first error cause */
1102                         code = cause_code;
1103                 }
1104                 switch (cause_code) {
1105                 case SCTP_CAUSE_INVALID_STREAM:
1106                 case SCTP_CAUSE_MISSING_PARAM:
1107                 case SCTP_CAUSE_INVALID_PARAM:
1108                 case SCTP_CAUSE_NO_USER_DATA:
1109                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1110                             cause_code);
1111                         break;
1112                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1113                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n",
1114                             ch->chunk_flags);
1115                         if (sctp_handle_nat_colliding_state(stcb)) {
1116                                 return (0);
1117                         }
1118                         break;
1119                 case SCTP_CAUSE_NAT_MISSING_STATE:
1120                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n",
1121                             ch->chunk_flags);
1122                         if (sctp_handle_nat_missing_state(stcb, net)) {
1123                                 return (0);
1124                         }
1125                         break;
1126                 case SCTP_CAUSE_STALE_COOKIE:
1127                         /*
1128                          * We only act if we have echoed a cookie and are
1129                          * waiting.
1130                          */
1131                         if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1132                             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1133                                 struct sctp_error_stale_cookie *stale_cookie;
1134
1135                                 stale_cookie = (struct sctp_error_stale_cookie *)cause;
1136                                 /* stable_time is in usec, convert to msec. */
1137                                 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time) / 1000;
1138                                 /* Double it to be more robust on RTX. */
1139                                 asoc->cookie_preserve_req *= 2;
1140                                 asoc->stale_cookie_count++;
1141                                 if (asoc->stale_cookie_count >
1142                                     asoc->max_init_times) {
1143                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1144                                         /* now free the asoc */
1145                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1146                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1147                                         return (-1);
1148                                 }
1149                                 /* blast back to INIT state */
1150                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1151                                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1152                                 sctp_stop_all_cookie_timers(stcb);
1153                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1154                         }
1155                         break;
1156                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1157                         /*
1158                          * Nothing we can do here, we don't do hostname
1159                          * addresses so if the peer does not like my IPv6
1160                          * (or IPv4 for that matter) it does not matter. If
1161                          * they don't support that type of address, they can
1162                          * NOT possibly get that packet type... i.e. with no
1163                          * IPv6 you can't receive a IPv6 packet. so we can
1164                          * safely ignore this one. If we ever added support
1165                          * for HOSTNAME Addresses, then we would need to do
1166                          * something here.
1167                          */
1168                         break;
1169                 case SCTP_CAUSE_UNRECOG_CHUNK:
1170                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1171                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
1172
1173                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1174                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
1175                         }
1176                         break;
1177                 case SCTP_CAUSE_UNRECOG_PARAM:
1178                         /* XXX: We only consider the first parameter */
1179                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1180                                 struct sctp_paramhdr *unrec_parameter;
1181
1182                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1183                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1184                         }
1185                         break;
1186                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1187                         /*
1188                          * We ignore this since the timer will drive out a
1189                          * new cookie anyway and there timer will drive us
1190                          * to send a SHUTDOWN_COMPLETE. We can't send one
1191                          * here since we don't have their tag.
1192                          */
1193                         break;
1194                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1195                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1196                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1197                         /*
1198                          * We should NOT get these here, but in a
1199                          * ASCONF-ACK.
1200                          */
1201                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1202                             cause_code);
1203                         break;
1204                 case SCTP_CAUSE_OUT_OF_RESC:
1205                         /*
1206                          * And what, pray tell do we do with the fact that
1207                          * the peer is out of resources? Not really sure we
1208                          * could do anything but abort. I suspect this
1209                          * should have came WITH an abort instead of in a
1210                          * OP-ERROR.
1211                          */
1212                         break;
1213                 default:
1214                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1215                             cause_code);
1216                         break;
1217                 }
1218                 adjust = SCTP_SIZE32(cause_length);
1219                 if (remaining_length >= adjust) {
1220                         remaining_length -= adjust;
1221                 } else {
1222                         remaining_length = 0;
1223                 }
1224                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1225         }
1226         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1227         return (0);
1228 }
1229
1230 static int
1231 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1232     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1233     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1234     struct sctp_nets *net, int *abort_no_unlock,
1235     uint8_t mflowtype, uint32_t mflowid,
1236     uint32_t vrf_id)
1237 {
1238         struct sctp_init_ack *init_ack;
1239         struct mbuf *op_err;
1240
1241         SCTPDBG(SCTP_DEBUG_INPUT2,
1242             "sctp_handle_init_ack: handling INIT-ACK\n");
1243
1244         if (stcb == NULL) {
1245                 SCTPDBG(SCTP_DEBUG_INPUT2,
1246                     "sctp_handle_init_ack: TCB is null\n");
1247                 return (-1);
1248         }
1249         init_ack = &cp->init;
1250         /* Validate parameters. */
1251         if ((ntohl(init_ack->initiate_tag) == 0) ||
1252             (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) ||
1253             (ntohs(init_ack->num_inbound_streams) == 0) ||
1254             (ntohs(init_ack->num_outbound_streams) == 0)) {
1255                 /* protocol error... send an abort */
1256                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1257                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1258                     src, dst, sh, op_err,
1259                     mflowtype, mflowid,
1260                     vrf_id, net->port);
1261                 *abort_no_unlock = 1;
1262                 return (-1);
1263         }
1264         /* process according to association state... */
1265         switch (SCTP_GET_STATE(stcb)) {
1266         case SCTP_STATE_COOKIE_WAIT:
1267                 /* this is the expected state for this chunk */
1268                 /* process the INIT-ACK parameters */
1269                 if (stcb->asoc.primary_destination->dest_state &
1270                     SCTP_ADDR_UNCONFIRMED) {
1271                         /*
1272                          * The primary is where we sent the INIT, we can
1273                          * always consider it confirmed when the INIT-ACK is
1274                          * returned. Do this before we load addresses
1275                          * though.
1276                          */
1277                         stcb->asoc.primary_destination->dest_state &=
1278                             ~SCTP_ADDR_UNCONFIRMED;
1279                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1280                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1281                 }
1282                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1283                     net, abort_no_unlock,
1284                     mflowtype, mflowid,
1285                     vrf_id) < 0) {
1286                         /* error in parsing parameters */
1287                         return (-1);
1288                 }
1289                 /* update our state */
1290                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1291                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1292
1293                 /* reset the RTO calc */
1294                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1295                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1296                             stcb->asoc.overall_error_count,
1297                             0,
1298                             SCTP_FROM_SCTP_INPUT,
1299                             __LINE__);
1300                 }
1301                 stcb->asoc.overall_error_count = 0;
1302                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1303                 /*
1304                  * collapse the init timer back in case of a exponential
1305                  * backoff
1306                  */
1307                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1308                     stcb, net);
1309                 /*
1310                  * the send at the end of the inbound data processing will
1311                  * cause the cookie to be sent
1312                  */
1313                 break;
1314         case SCTP_STATE_SHUTDOWN_SENT:
1315                 /* incorrect state... discard */
1316                 break;
1317         case SCTP_STATE_COOKIE_ECHOED:
1318                 /* incorrect state... discard */
1319                 break;
1320         case SCTP_STATE_OPEN:
1321                 /* incorrect state... discard */
1322                 break;
1323         case SCTP_STATE_EMPTY:
1324         case SCTP_STATE_INUSE:
1325         default:
1326                 /* incorrect state... discard */
1327                 return (-1);
1328                 break;
1329         }
1330         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1331         return (0);
1332 }
1333
1334 static struct sctp_tcb *
1335 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1336     struct sockaddr *src, struct sockaddr *dst,
1337     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1338     struct sctp_inpcb *inp, struct sctp_nets **netp,
1339     struct sockaddr *init_src, int *notification,
1340     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1341     uint8_t mflowtype, uint32_t mflowid,
1342     uint32_t vrf_id, uint16_t port);
1343
1344 /*
1345  * handle a state cookie for an existing association m: input packet mbuf
1346  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1347  * "split" mbuf and the cookie signature does not exist offset: offset into
1348  * mbuf to the cookie-echo chunk
1349  */
1350 static struct sctp_tcb *
1351 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1352     struct sockaddr *src, struct sockaddr *dst,
1353     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1354     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1355     struct sockaddr *init_src, int *notification,
1356     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1357     uint8_t mflowtype, uint32_t mflowid,
1358     uint32_t vrf_id, uint16_t port)
1359 {
1360         struct sctp_association *asoc;
1361         struct sctp_init_chunk *init_cp, init_buf;
1362         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1363         struct sctp_asconf_addr *aparam, *naparam;
1364         struct sctp_asconf_ack *aack, *naack;
1365         struct sctp_tmit_chunk *chk, *nchk;
1366         struct sctp_stream_reset_list *strrst, *nstrrst;
1367         struct sctp_queued_to_read *sq, *nsq;
1368         struct sctp_nets *net;
1369         struct mbuf *op_err;
1370         struct timeval old;
1371         int init_offset, initack_offset, i;
1372         int retval;
1373         int spec_flag = 0;
1374         uint32_t how_indx;
1375 #if defined(SCTP_DETAILED_STR_STATS)
1376         int j;
1377 #endif
1378
1379         net = *netp;
1380         /* I know that the TCB is non-NULL from the caller */
1381         asoc = &stcb->asoc;
1382         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1383                 if (asoc->cookie_how[how_indx] == 0)
1384                         break;
1385         }
1386         if (how_indx < sizeof(asoc->cookie_how)) {
1387                 asoc->cookie_how[how_indx] = 1;
1388         }
1389         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1390                 /* SHUTDOWN came in after sending INIT-ACK */
1391                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1392                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1393                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1394                     mflowtype, mflowid, inp->fibnum,
1395                     vrf_id, net->port);
1396                 if (how_indx < sizeof(asoc->cookie_how))
1397                         asoc->cookie_how[how_indx] = 2;
1398                 SCTP_TCB_UNLOCK(stcb);
1399                 return (NULL);
1400         }
1401         /*
1402          * find and validate the INIT chunk in the cookie (peer's info) the
1403          * INIT should start after the cookie-echo header struct (chunk
1404          * header, state cookie header struct)
1405          */
1406         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1407
1408         init_cp = (struct sctp_init_chunk *)
1409             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1410             (uint8_t *)&init_buf);
1411         if (init_cp == NULL) {
1412                 /* could not pull a INIT chunk in cookie */
1413                 SCTP_TCB_UNLOCK(stcb);
1414                 return (NULL);
1415         }
1416         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1417                 SCTP_TCB_UNLOCK(stcb);
1418                 return (NULL);
1419         }
1420         /*
1421          * find and validate the INIT-ACK chunk in the cookie (my info) the
1422          * INIT-ACK follows the INIT chunk
1423          */
1424         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1425         initack_cp = (struct sctp_init_ack_chunk *)
1426             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1427             (uint8_t *)&initack_buf);
1428         if (initack_cp == NULL) {
1429                 /* could not pull INIT-ACK chunk in cookie */
1430                 SCTP_TCB_UNLOCK(stcb);
1431                 return (NULL);
1432         }
1433         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1434                 SCTP_TCB_UNLOCK(stcb);
1435                 return (NULL);
1436         }
1437         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1438             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1439                 /*
1440                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1441                  * to get into the OPEN state
1442                  */
1443                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1444                         /*-
1445                          * Opps, this means that we somehow generated two vtag's
1446                          * the same. I.e. we did:
1447                          *  Us               Peer
1448                          *   <---INIT(tag=a)------
1449                          *   ----INIT-ACK(tag=t)-->
1450                          *   ----INIT(tag=t)------> *1
1451                          *   <---INIT-ACK(tag=a)---
1452                          *   <----CE(tag=t)------------- *2
1453                          *
1454                          * At point *1 we should be generating a different
1455                          * tag t'. Which means we would throw away the CE and send
1456                          * ours instead. Basically this is case C (throw away side).
1457                          */
1458                         if (how_indx < sizeof(asoc->cookie_how))
1459                                 asoc->cookie_how[how_indx] = 17;
1460                         SCTP_TCB_UNLOCK(stcb);
1461                         return (NULL);
1462                 }
1463                 switch (SCTP_GET_STATE(stcb)) {
1464                 case SCTP_STATE_COOKIE_WAIT:
1465                 case SCTP_STATE_COOKIE_ECHOED:
1466                         /*
1467                          * INIT was sent but got a COOKIE_ECHO with the
1468                          * correct tags... just accept it...but we must
1469                          * process the init so that we can make sure we have
1470                          * the right seq no's.
1471                          */
1472                         /* First we must process the INIT !! */
1473                         if (sctp_process_init(init_cp, stcb) < 0) {
1474                                 if (how_indx < sizeof(asoc->cookie_how))
1475                                         asoc->cookie_how[how_indx] = 3;
1476                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1477                                 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1478                                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1479                                     src, dst, sh, op_err,
1480                                     mflowtype, mflowid,
1481                                     vrf_id, net->port);
1482                                 return (NULL);
1483                         }
1484                         /* we have already processed the INIT so no problem */
1485                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1486                             stcb, net,
1487                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1488                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1489                             stcb, net,
1490                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1491                         /* update current state */
1492                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1493                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1494                         else
1495                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1496
1497                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1498                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1499                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1500                                     stcb->sctp_ep, stcb, NULL);
1501                         }
1502                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1503                         sctp_stop_all_cookie_timers(stcb);
1504                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1505                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1506                             (!SCTP_IS_LISTENING(inp))) {
1507                                 /*
1508                                  * Here is where collision would go if we
1509                                  * did a connect() and instead got a
1510                                  * init/init-ack/cookie done before the
1511                                  * init-ack came back..
1512                                  */
1513                                 stcb->sctp_ep->sctp_flags |=
1514                                     SCTP_PCB_FLAGS_CONNECTED;
1515                                 soisconnected(stcb->sctp_socket);
1516                         }
1517                         /* notify upper layer */
1518                         *notification = SCTP_NOTIFY_ASSOC_UP;
1519                         /*
1520                          * since we did not send a HB make sure we don't
1521                          * double things
1522                          */
1523                         old.tv_sec = cookie->time_entered.tv_sec;
1524                         old.tv_usec = cookie->time_entered.tv_usec;
1525                         net->hb_responded = 1;
1526                         sctp_calculate_rto(stcb, asoc, net, &old,
1527                             SCTP_RTT_FROM_NON_DATA);
1528
1529                         if (stcb->asoc.sctp_autoclose_ticks &&
1530                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1531                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1532                                     inp, stcb, NULL);
1533                         }
1534                         break;
1535                 default:
1536                         /*
1537                          * we're in the OPEN state (or beyond), so peer must
1538                          * have simply lost the COOKIE-ACK
1539                          */
1540                         break;
1541                 }               /* end switch */
1542                 sctp_stop_all_cookie_timers(stcb);
1543                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1544                     init_offset + sizeof(struct sctp_init_chunk),
1545                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1546                         if (how_indx < sizeof(asoc->cookie_how))
1547                                 asoc->cookie_how[how_indx] = 4;
1548                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1549                             "Problem with address parameters");
1550                         SCTPDBG(SCTP_DEBUG_INPUT1,
1551                             "Load addresses from INIT causes an abort %d\n",
1552                             retval);
1553                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1554                             src, dst, sh, op_err,
1555                             mflowtype, mflowid,
1556                             vrf_id, net->port);
1557                         return (NULL);
1558                 }
1559                 /* respond with a COOKIE-ACK */
1560                 sctp_toss_old_cookies(stcb, asoc);
1561                 sctp_send_cookie_ack(stcb);
1562                 if (how_indx < sizeof(asoc->cookie_how))
1563                         asoc->cookie_how[how_indx] = 5;
1564                 return (stcb);
1565         }
1566
1567         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1568             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1569             cookie->tie_tag_my_vtag == 0 &&
1570             cookie->tie_tag_peer_vtag == 0) {
1571                 /*
1572                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1573                  */
1574                 if (how_indx < sizeof(asoc->cookie_how))
1575                         asoc->cookie_how[how_indx] = 6;
1576                 SCTP_TCB_UNLOCK(stcb);
1577                 return (NULL);
1578         }
1579         /*
1580          * If nat support, and the below and stcb is established, send back
1581          * a ABORT(colliding state) if we are established.
1582          */
1583         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1584             (asoc->peer_supports_nat) &&
1585             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1586             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1587             (asoc->peer_vtag == 0)))) {
1588                 /*
1589                  * Special case - Peer's support nat. We may have two init's
1590                  * that we gave out the same tag on since one was not
1591                  * established.. i.e. we get INIT from host-1 behind the nat
1592                  * and we respond tag-a, we get a INIT from host-2 behind
1593                  * the nat and we get tag-a again. Then we bring up host-1
1594                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1595                  * Now we have colliding state. We must send an abort here
1596                  * with colliding state indication.
1597                  */
1598                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1599                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1600                     mflowtype, mflowid, inp->fibnum,
1601                     vrf_id, port);
1602                 SCTP_TCB_UNLOCK(stcb);
1603                 return (NULL);
1604         }
1605         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1606             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1607             (asoc->peer_vtag == 0))) {
1608                 /*
1609                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1610                  * should be ok, re-accept peer info
1611                  */
1612                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1613                         /*
1614                          * Extension of case C. If we hit this, then the
1615                          * random number generator returned the same vtag
1616                          * when we first sent our INIT-ACK and when we later
1617                          * sent our INIT. The side with the seq numbers that
1618                          * are different will be the one that normnally
1619                          * would have hit case C. This in effect "extends"
1620                          * our vtags in this collision case to be 64 bits.
1621                          * The same collision could occur aka you get both
1622                          * vtag and seq number the same twice in a row.. but
1623                          * is much less likely. If it did happen then we
1624                          * would proceed through and bring up the assoc.. we
1625                          * may end up with the wrong stream setup however..
1626                          * which would be bad.. but there is no way to
1627                          * tell.. until we send on a stream that does not
1628                          * exist :-)
1629                          */
1630                         if (how_indx < sizeof(asoc->cookie_how))
1631                                 asoc->cookie_how[how_indx] = 7;
1632
1633                         SCTP_TCB_UNLOCK(stcb);
1634                         return (NULL);
1635                 }
1636                 if (how_indx < sizeof(asoc->cookie_how))
1637                         asoc->cookie_how[how_indx] = 8;
1638                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1639                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1640                 sctp_stop_all_cookie_timers(stcb);
1641                 /*
1642                  * since we did not send a HB make sure we don't double
1643                  * things
1644                  */
1645                 net->hb_responded = 1;
1646                 if (stcb->asoc.sctp_autoclose_ticks &&
1647                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1648                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1649                             NULL);
1650                 }
1651                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1652                 if (asoc->pre_open_streams < asoc->streamoutcnt) {
1653                         asoc->pre_open_streams = asoc->streamoutcnt;
1654                 }
1655
1656                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1657                         /*
1658                          * Ok the peer probably discarded our data (if we
1659                          * echoed a cookie+data). So anything on the
1660                          * sent_queue should be marked for retransmit, we
1661                          * may not get something to kick us so it COULD
1662                          * still take a timeout to move these.. but it can't
1663                          * hurt to mark them.
1664                          */
1665
1666                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1667                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1668                                         chk->sent = SCTP_DATAGRAM_RESEND;
1669                                         sctp_flight_size_decrease(chk);
1670                                         sctp_total_flight_decrease(stcb, chk);
1671                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1672                                         spec_flag++;
1673                                 }
1674                         }
1675                 }
1676                 /* process the INIT info (peer's info) */
1677                 if (sctp_process_init(init_cp, stcb) < 0) {
1678                         if (how_indx < sizeof(asoc->cookie_how))
1679                                 asoc->cookie_how[how_indx] = 9;
1680                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1681                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1682                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1683                             src, dst, sh, op_err,
1684                             mflowtype, mflowid,
1685                             vrf_id, net->port);
1686                         return (NULL);
1687                 }
1688                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1689                     init_offset + sizeof(struct sctp_init_chunk),
1690                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1691                         if (how_indx < sizeof(asoc->cookie_how))
1692                                 asoc->cookie_how[how_indx] = 10;
1693                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1694                             "Problem with address parameters");
1695                         SCTPDBG(SCTP_DEBUG_INPUT1,
1696                             "Load addresses from INIT causes an abort %d\n",
1697                             retval);
1698                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1699                             src, dst, sh, op_err,
1700                             mflowtype, mflowid,
1701                             vrf_id, net->port);
1702                         return (NULL);
1703                 }
1704                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1705                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1706                         *notification = SCTP_NOTIFY_ASSOC_UP;
1707
1708                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1709                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1710                             (!SCTP_IS_LISTENING(inp))) {
1711                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1712                                 soisconnected(stcb->sctp_socket);
1713                         }
1714                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1715                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1716                         else
1717                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1718                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1719                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1720                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1721                 } else {
1722                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1723                 }
1724                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1725                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1726                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1727                             stcb->sctp_ep, stcb, NULL);
1728                 }
1729                 sctp_stop_all_cookie_timers(stcb);
1730                 sctp_toss_old_cookies(stcb, asoc);
1731                 sctp_send_cookie_ack(stcb);
1732                 if (spec_flag) {
1733                         /*
1734                          * only if we have retrans set do we do this. What
1735                          * this call does is get only the COOKIE-ACK out and
1736                          * then when we return the normal call to
1737                          * sctp_chunk_output will get the retrans out behind
1738                          * this.
1739                          */
1740                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1741                 }
1742                 if (how_indx < sizeof(asoc->cookie_how))
1743                         asoc->cookie_how[how_indx] = 11;
1744
1745                 return (stcb);
1746         }
1747         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1748             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1749             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1750             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1751             cookie->tie_tag_peer_vtag != 0) {
1752                 struct sctpasochead *head;
1753
1754                 if (asoc->peer_supports_nat) {
1755                         struct sctp_tcb *local_stcb;
1756
1757                         /*
1758                          * This is a gross gross hack. Just call the
1759                          * cookie_new code since we are allowing a duplicate
1760                          * association. I hope this works...
1761                          */
1762                         local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst,
1763                             sh, cookie, cookie_len,
1764                             inp, netp, init_src, notification,
1765                             auth_skipped, auth_offset, auth_len,
1766                             mflowtype, mflowid,
1767                             vrf_id, port);
1768                         if (local_stcb == NULL) {
1769                                 SCTP_TCB_UNLOCK(stcb);
1770                         }
1771                         return (local_stcb);
1772                 }
1773                 /*
1774                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1775                  */
1776                 /* temp code */
1777                 if (how_indx < sizeof(asoc->cookie_how))
1778                         asoc->cookie_how[how_indx] = 12;
1779                 sctp_stop_association_timers(stcb, false);
1780                 /* notify upper layer */
1781                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1782                 atomic_add_int(&stcb->asoc.refcnt, 1);
1783                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1784                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1785                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1786                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1787                 }
1788                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1789                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1790                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1791                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1792                 }
1793                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1794                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1795                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1796                             stcb->sctp_ep, stcb, NULL);
1797
1798                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1799                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1800                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1801                 }
1802                 if (asoc->pre_open_streams < asoc->streamoutcnt) {
1803                         asoc->pre_open_streams = asoc->streamoutcnt;
1804                 }
1805                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1806                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1807                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1808                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1809                 asoc->str_reset_seq_in = asoc->init_seq_number;
1810                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1811                 asoc->send_sack = 1;
1812                 asoc->data_pkts_seen = 0;
1813                 asoc->last_data_chunk_from = NULL;
1814                 asoc->last_control_chunk_from = NULL;
1815                 asoc->last_net_cmt_send_started = NULL;
1816                 if (asoc->mapping_array) {
1817                         memset(asoc->mapping_array, 0,
1818                             asoc->mapping_array_size);
1819                 }
1820                 if (asoc->nr_mapping_array) {
1821                         memset(asoc->nr_mapping_array, 0,
1822                             asoc->mapping_array_size);
1823                 }
1824                 SCTP_TCB_UNLOCK(stcb);
1825                 SCTP_INP_INFO_WLOCK();
1826                 SCTP_INP_WLOCK(stcb->sctp_ep);
1827                 SCTP_TCB_LOCK(stcb);
1828                 atomic_add_int(&stcb->asoc.refcnt, -1);
1829                 /* send up all the data */
1830                 SCTP_TCB_SEND_LOCK(stcb);
1831
1832                 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
1833                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1834                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1835 #if defined(SCTP_DETAILED_STR_STATS)
1836                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1837                                 asoc->strmout[i].abandoned_sent[j] = 0;
1838                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1839                         }
1840 #else
1841                         asoc->strmout[i].abandoned_sent[0] = 0;
1842                         asoc->strmout[i].abandoned_unsent[0] = 0;
1843 #endif
1844                         stcb->asoc.strmout[i].next_mid_ordered = 0;
1845                         stcb->asoc.strmout[i].next_mid_unordered = 0;
1846                         stcb->asoc.strmout[i].sid = i;
1847                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1848                 }
1849                 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) {
1850                         TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp);
1851                         SCTP_FREE(strrst, SCTP_M_STRESET);
1852                 }
1853                 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) {
1854                         TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next);
1855                         if (sq->data) {
1856                                 sctp_m_freem(sq->data);
1857                                 sq->data = NULL;
1858                         }
1859                         sctp_free_remote_addr(sq->whoFrom);
1860                         sq->whoFrom = NULL;
1861                         sq->stcb = NULL;
1862                         sctp_free_a_readq(stcb, sq);
1863                 }
1864                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
1865                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
1866                         if (chk->data) {
1867                                 sctp_m_freem(chk->data);
1868                                 chk->data = NULL;
1869                         }
1870                         if (chk->holds_key_ref)
1871                                 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1872                         sctp_free_remote_addr(chk->whoTo);
1873                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1874                         SCTP_DECR_CHK_COUNT();
1875                 }
1876                 asoc->ctrl_queue_cnt = 0;
1877                 asoc->str_reset = NULL;
1878                 asoc->stream_reset_outstanding = 0;
1879                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
1880                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
1881                         if (chk->data) {
1882                                 sctp_m_freem(chk->data);
1883                                 chk->data = NULL;
1884                         }
1885                         if (chk->holds_key_ref)
1886                                 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1887                         sctp_free_remote_addr(chk->whoTo);
1888                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1889                         SCTP_DECR_CHK_COUNT();
1890                 }
1891                 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) {
1892                         TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
1893                         SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
1894                 }
1895                 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) {
1896                         TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next);
1897                         if (aack->data != NULL) {
1898                                 sctp_m_freem(aack->data);
1899                         }
1900                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack);
1901                 }
1902
1903                 /* process the INIT-ACK info (my info) */
1904                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1905                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1906
1907                 /* pull from vtag hash */
1908                 LIST_REMOVE(stcb, sctp_asocs);
1909                 /* re-insert to new vtag position */
1910                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1911                     SCTP_BASE_INFO(hashasocmark))];
1912                 /*
1913                  * put it in the bucket in the vtag hash of assoc's for the
1914                  * system
1915                  */
1916                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1917
1918                 SCTP_TCB_SEND_UNLOCK(stcb);
1919                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1920                 SCTP_INP_INFO_WUNLOCK();
1921                 asoc->total_flight = 0;
1922                 asoc->total_flight_count = 0;
1923                 /* process the INIT info (peer's info) */
1924                 if (sctp_process_init(init_cp, stcb) < 0) {
1925                         if (how_indx < sizeof(asoc->cookie_how))
1926                                 asoc->cookie_how[how_indx] = 13;
1927                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1928                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1929                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1930                             src, dst, sh, op_err,
1931                             mflowtype, mflowid,
1932                             vrf_id, net->port);
1933                         return (NULL);
1934                 }
1935                 /*
1936                  * since we did not send a HB make sure we don't double
1937                  * things
1938                  */
1939                 net->hb_responded = 1;
1940
1941                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1942                     init_offset + sizeof(struct sctp_init_chunk),
1943                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1944                         if (how_indx < sizeof(asoc->cookie_how))
1945                                 asoc->cookie_how[how_indx] = 14;
1946                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1947                             "Problem with address parameters");
1948                         SCTPDBG(SCTP_DEBUG_INPUT1,
1949                             "Load addresses from INIT causes an abort %d\n",
1950                             retval);
1951                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1952                             src, dst, sh, op_err,
1953                             mflowtype, mflowid,
1954                             vrf_id, net->port);
1955                         return (NULL);
1956                 }
1957                 /* respond with a COOKIE-ACK */
1958                 sctp_send_cookie_ack(stcb);
1959                 if (how_indx < sizeof(asoc->cookie_how))
1960                         asoc->cookie_how[how_indx] = 15;
1961                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) &&
1962                     (asoc->sctp_autoclose_ticks > 0)) {
1963                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
1964                 }
1965                 return (stcb);
1966         }
1967         if (how_indx < sizeof(asoc->cookie_how))
1968                 asoc->cookie_how[how_indx] = 16;
1969         /* all other cases... */
1970         SCTP_TCB_UNLOCK(stcb);
1971         return (NULL);
1972 }
1973
1974 /*
1975  * handle a state cookie for a new association m: input packet mbuf chain--
1976  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1977  * and the cookie signature does not exist offset: offset into mbuf to the
1978  * cookie-echo chunk length: length of the cookie chunk to: where the init
1979  * was from returns a new TCB
1980  */
1981 static struct sctp_tcb *
1982 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1983     struct sockaddr *src, struct sockaddr *dst,
1984     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1985     struct sctp_inpcb *inp, struct sctp_nets **netp,
1986     struct sockaddr *init_src, int *notification,
1987     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1988     uint8_t mflowtype, uint32_t mflowid,
1989     uint32_t vrf_id, uint16_t port)
1990 {
1991         struct sctp_tcb *stcb;
1992         struct sctp_init_chunk *init_cp, init_buf;
1993         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1994         union sctp_sockstore store;
1995         struct sctp_association *asoc;
1996         int init_offset, initack_offset, initack_limit;
1997         int retval;
1998         int error = 0;
1999         uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
2000
2001         /*
2002          * find and validate the INIT chunk in the cookie (peer's info) the
2003          * INIT should start after the cookie-echo header struct (chunk
2004          * header, state cookie header struct)
2005          */
2006         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2007         init_cp = (struct sctp_init_chunk *)
2008             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2009             (uint8_t *)&init_buf);
2010         if (init_cp == NULL) {
2011                 /* could not pull a INIT chunk in cookie */
2012                 SCTPDBG(SCTP_DEBUG_INPUT1,
2013                     "process_cookie_new: could not pull INIT chunk hdr\n");
2014                 return (NULL);
2015         }
2016         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2017                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2018                 return (NULL);
2019         }
2020         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2021         /*
2022          * find and validate the INIT-ACK chunk in the cookie (my info) the
2023          * INIT-ACK follows the INIT chunk
2024          */
2025         initack_cp = (struct sctp_init_ack_chunk *)
2026             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2027             (uint8_t *)&initack_buf);
2028         if (initack_cp == NULL) {
2029                 /* could not pull INIT-ACK chunk in cookie */
2030                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2031                 return (NULL);
2032         }
2033         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2034                 return (NULL);
2035         }
2036         /*
2037          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2038          * "initack_limit" value.  This is because the chk_length field
2039          * includes the length of the cookie, but the cookie is omitted when
2040          * the INIT and INIT_ACK are tacked onto the cookie...
2041          */
2042         initack_limit = offset + cookie_len;
2043
2044         /*
2045          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2046          * and popluate
2047          */
2048
2049         /*
2050          * Here we do a trick, we set in NULL for the proc/thread argument.
2051          * We do this since in effect we only use the p argument when the
2052          * socket is unbound and we must do an implicit bind. Since we are
2053          * getting a cookie, we cannot be unbound.
2054          */
2055         stcb = sctp_aloc_assoc(inp, init_src, &error,
2056             ntohl(initack_cp->init.initiate_tag), vrf_id,
2057             ntohs(initack_cp->init.num_outbound_streams),
2058             port,
2059             (struct thread *)NULL,
2060             SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2061         if (stcb == NULL) {
2062                 struct mbuf *op_err;
2063
2064                 /* memory problem? */
2065                 SCTPDBG(SCTP_DEBUG_INPUT1,
2066                     "process_cookie_new: no room for another TCB!\n");
2067                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2068                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2069                     src, dst, sh, op_err,
2070                     mflowtype, mflowid,
2071                     vrf_id, port);
2072                 return (NULL);
2073         }
2074         asoc = &stcb->asoc;
2075         /* get scope variables out of cookie */
2076         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2077         asoc->scope.site_scope = cookie->site_scope;
2078         asoc->scope.local_scope = cookie->local_scope;
2079         asoc->scope.loopback_scope = cookie->loopback_scope;
2080
2081         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2082             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2083                 struct mbuf *op_err;
2084
2085                 /*
2086                  * Houston we have a problem. The EP changed while the
2087                  * cookie was in flight. Only recourse is to abort the
2088                  * association.
2089                  */
2090                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2091                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2092                     src, dst, sh, op_err,
2093                     mflowtype, mflowid,
2094                     vrf_id, port);
2095                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2096                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2097                 return (NULL);
2098         }
2099         /* process the INIT-ACK info (my info) */
2100         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2101         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2102         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2103         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2104         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2105         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2106         asoc->str_reset_seq_in = asoc->init_seq_number;
2107
2108         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2109
2110         /* process the INIT info (peer's info) */
2111         if (sctp_process_init(init_cp, stcb) < 0) {
2112                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2113                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2114                 return (NULL);
2115         }
2116         /* load all addresses */
2117         if ((retval = sctp_load_addresses_from_init(stcb, m,
2118             init_offset + sizeof(struct sctp_init_chunk),
2119             initack_offset, src, dst, init_src, port)) < 0) {
2120                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2121                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2122                 return (NULL);
2123         }
2124         /*
2125          * verify any preceding AUTH chunk that was skipped
2126          */
2127         /* pull the local authentication parameters from the cookie/init-ack */
2128         sctp_auth_get_cookie_params(stcb, m,
2129             initack_offset + sizeof(struct sctp_init_ack_chunk),
2130             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2131         if (auth_skipped) {
2132                 struct sctp_auth_chunk *auth;
2133
2134                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
2135                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2136                 } else {
2137                         auth = NULL;
2138                 }
2139                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2140                         /* auth HMAC failed, dump the assoc and packet */
2141                         SCTPDBG(SCTP_DEBUG_AUTH1,
2142                             "COOKIE-ECHO: AUTH failed\n");
2143                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2144                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2145                         return (NULL);
2146                 } else {
2147                         /* remaining chunks checked... good to go */
2148                         stcb->asoc.authenticated = 1;
2149                 }
2150         }
2151
2152         /*
2153          * if we're doing ASCONFs, check to see if we have any new local
2154          * addresses that need to get added to the peer (eg. addresses
2155          * changed while cookie echo in flight).  This needs to be done
2156          * after we go to the OPEN state to do the correct asconf
2157          * processing. else, make sure we have the correct addresses in our
2158          * lists
2159          */
2160
2161         /* warning, we re-use sin, sin6, sa_store here! */
2162         /* pull in local_address (our "from" address) */
2163         switch (cookie->laddr_type) {
2164 #ifdef INET
2165         case SCTP_IPV4_ADDRESS:
2166                 /* source addr is IPv4 */
2167                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2168                 store.sin.sin_family = AF_INET;
2169                 store.sin.sin_len = sizeof(struct sockaddr_in);
2170                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2171                 break;
2172 #endif
2173 #ifdef INET6
2174         case SCTP_IPV6_ADDRESS:
2175                 /* source addr is IPv6 */
2176                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2177                 store.sin6.sin6_family = AF_INET6;
2178                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2179                 store.sin6.sin6_scope_id = cookie->scope_id;
2180                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2181                 break;
2182 #endif
2183         default:
2184                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2185                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2186                 return (NULL);
2187         }
2188
2189         /* update current state */
2190         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2191         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2192         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2193                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2194                     stcb->sctp_ep, stcb, NULL);
2195         }
2196         sctp_stop_all_cookie_timers(stcb);
2197         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2198         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2199
2200         /* set up to notify upper layer */
2201         *notification = SCTP_NOTIFY_ASSOC_UP;
2202         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2203             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2204             (!SCTP_IS_LISTENING(inp))) {
2205                 /*
2206                  * This is an endpoint that called connect() how it got a
2207                  * cookie that is NEW is a bit of a mystery. It must be that
2208                  * the INIT was sent, but before it got there.. a complete
2209                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2210                  * should have went to the other code.. not here.. oh well..
2211                  * a bit of protection is worth having..
2212                  */
2213                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2214                 soisconnected(stcb->sctp_socket);
2215         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2216             (SCTP_IS_LISTENING(inp))) {
2217                 /*
2218                  * We don't want to do anything with this one. Since it is
2219                  * the listening guy. The timer will get started for
2220                  * accepted connections in the caller.
2221                  */
2222                 ;
2223         }
2224         if (stcb->asoc.sctp_autoclose_ticks &&
2225             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2226                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2227         }
2228         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2229         *netp = sctp_findnet(stcb, init_src);
2230         if (*netp != NULL) {
2231                 struct timeval old;
2232
2233                 /*
2234                  * Since we did not send a HB, make sure we don't double
2235                  * things.
2236                  */
2237                 (*netp)->hb_responded = 1;
2238                 /* Calculate the RTT. */
2239                 old.tv_sec = cookie->time_entered.tv_sec;
2240                 old.tv_usec = cookie->time_entered.tv_usec;
2241                 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
2242         }
2243         /* respond with a COOKIE-ACK */
2244         sctp_send_cookie_ack(stcb);
2245
2246         /*
2247          * check the address lists for any ASCONFs that need to be sent
2248          * AFTER the cookie-ack is sent
2249          */
2250         sctp_check_address_list(stcb, m,
2251             initack_offset + sizeof(struct sctp_init_ack_chunk),
2252             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2253             &store.sa, cookie->local_scope, cookie->site_scope,
2254             cookie->ipv4_scope, cookie->loopback_scope);
2255
2256         return (stcb);
2257 }
2258
2259 /*
2260  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2261  * we NEED to make sure we are not already using the vtag. If so we
2262  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2263         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2264                                                             SCTP_BASE_INFO(hashasocmark))];
2265         LIST_FOREACH(stcb, head, sctp_asocs) {
2266                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2267                        -- SEND ABORT - TRY AGAIN --
2268                 }
2269         }
2270 */
2271
2272 /*
2273  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2274  * existing (non-NULL) TCB
2275  */
2276 static struct mbuf *
2277 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2278     struct sockaddr *src, struct sockaddr *dst,
2279     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2280     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2281     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2282     struct sctp_tcb **locked_tcb,
2283     uint8_t mflowtype, uint32_t mflowid,
2284     uint32_t vrf_id, uint16_t port)
2285 {
2286         struct sctp_state_cookie *cookie;
2287         struct sctp_tcb *l_stcb = *stcb;
2288         struct sctp_inpcb *l_inp;
2289         struct sockaddr *to;
2290         struct sctp_pcb *ep;
2291         struct mbuf *m_sig;
2292         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2293         uint8_t *sig;
2294         uint8_t cookie_ok = 0;
2295         unsigned int sig_offset, cookie_offset;
2296         unsigned int cookie_len;
2297         struct timeval now;
2298         struct timeval time_entered, time_expires;
2299         int notification = 0;
2300         struct sctp_nets *netl;
2301         int had_a_existing_tcb = 0;
2302         int send_int_conf = 0;
2303 #ifdef INET
2304         struct sockaddr_in sin;
2305 #endif
2306 #ifdef INET6
2307         struct sockaddr_in6 sin6;
2308 #endif
2309
2310         SCTPDBG(SCTP_DEBUG_INPUT2,
2311             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2312
2313         if (inp_p == NULL) {
2314                 return (NULL);
2315         }
2316         cookie = &cp->cookie;
2317         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2318         cookie_len = ntohs(cp->ch.chunk_length);
2319
2320         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2321             sizeof(struct sctp_init_chunk) +
2322             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2323                 /* cookie too small */
2324                 return (NULL);
2325         }
2326         if ((cookie->peerport != sh->src_port) ||
2327             (cookie->myport != sh->dest_port) ||
2328             (cookie->my_vtag != sh->v_tag)) {
2329                 /*
2330                  * invalid ports or bad tag.  Note that we always leave the
2331                  * v_tag in the header in network order and when we stored
2332                  * it in the my_vtag slot we also left it in network order.
2333                  * This maintains the match even though it may be in the
2334                  * opposite byte order of the machine :->
2335                  */
2336                 return (NULL);
2337         }
2338         /*
2339          * split off the signature into its own mbuf (since it should not be
2340          * calculated in the sctp_hmac_m() call).
2341          */
2342         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2343         m_sig = m_split(m, sig_offset, M_NOWAIT);
2344         if (m_sig == NULL) {
2345                 /* out of memory or ?? */
2346                 return (NULL);
2347         }
2348 #ifdef SCTP_MBUF_LOGGING
2349         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2350                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2351         }
2352 #endif
2353
2354         /*
2355          * compute the signature/digest for the cookie
2356          */
2357         ep = &(*inp_p)->sctp_ep;
2358         l_inp = *inp_p;
2359         if (l_stcb) {
2360                 SCTP_TCB_UNLOCK(l_stcb);
2361         }
2362         SCTP_INP_RLOCK(l_inp);
2363         if (l_stcb) {
2364                 SCTP_TCB_LOCK(l_stcb);
2365         }
2366         /* which cookie is it? */
2367         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2368             (ep->current_secret_number != ep->last_secret_number)) {
2369                 /* it's the old cookie */
2370                 (void)sctp_hmac_m(SCTP_HMAC,
2371                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2372                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2373         } else {
2374                 /* it's the current cookie */
2375                 (void)sctp_hmac_m(SCTP_HMAC,
2376                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2377                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2378         }
2379         /* get the signature */
2380         SCTP_INP_RUNLOCK(l_inp);
2381         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2382         if (sig == NULL) {
2383                 /* couldn't find signature */
2384                 sctp_m_freem(m_sig);
2385                 return (NULL);
2386         }
2387         /* compare the received digest with the computed digest */
2388         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2389                 /* try the old cookie? */
2390                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2391                     (ep->current_secret_number != ep->last_secret_number)) {
2392                         /* compute digest with old */
2393                         (void)sctp_hmac_m(SCTP_HMAC,
2394                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2395                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2396                         /* compare */
2397                         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2398                                 cookie_ok = 1;
2399                 }
2400         } else {
2401                 cookie_ok = 1;
2402         }
2403
2404         /*
2405          * Now before we continue we must reconstruct our mbuf so that
2406          * normal processing of any other chunks will work.
2407          */
2408         {
2409                 struct mbuf *m_at;
2410
2411                 m_at = m;
2412                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2413                         m_at = SCTP_BUF_NEXT(m_at);
2414                 }
2415                 SCTP_BUF_NEXT(m_at) = m_sig;
2416         }
2417
2418         if (cookie_ok == 0) {
2419                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2420                 SCTPDBG(SCTP_DEBUG_INPUT2,
2421                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2422                     (uint32_t)offset, cookie_offset, sig_offset);
2423                 return (NULL);
2424         }
2425
2426         if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) {
2427                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n");
2428                 return (NULL);
2429         }
2430         time_entered.tv_sec = cookie->time_entered.tv_sec;
2431         time_entered.tv_usec = cookie->time_entered.tv_usec;
2432         if ((time_entered.tv_sec < 0) ||
2433             (time_entered.tv_usec < 0) ||
2434             (time_entered.tv_usec >= 1000000)) {
2435                 /* Invalid time stamp. Cookie must have been modified. */
2436                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n");
2437                 return (NULL);
2438         }
2439         (void)SCTP_GETTIME_TIMEVAL(&now);
2440         if (timevalcmp(&now, &time_entered, <)) {
2441                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n");
2442                 return (NULL);
2443         }
2444         /*
2445          * Check the cookie timestamps to be sure it's not stale.
2446          * cookie_life is in ticks, so we convert to seconds.
2447          */
2448         time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
2449         time_expires.tv_usec = time_entered.tv_usec;
2450         if (timevalcmp(&now, &time_expires, >)) {
2451                 /* cookie is stale! */
2452                 struct mbuf *op_err;
2453                 struct sctp_error_stale_cookie *cause;
2454                 struct timeval diff;
2455                 uint32_t staleness;
2456
2457                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2458                     0, M_NOWAIT, 1, MT_DATA);
2459                 if (op_err == NULL) {
2460                         /* FOOBAR */
2461                         return (NULL);
2462                 }
2463                 /* Set the len */
2464                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2465                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2466                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2467                 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie));
2468                 diff = now;
2469                 timevalsub(&diff, &time_expires);
2470                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2471                         staleness = UINT32_MAX;
2472                 } else {
2473                         staleness = diff.tv_sec * 1000000;
2474                 }
2475                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2476                         staleness += diff.tv_usec;
2477                 } else {
2478                         staleness = UINT32_MAX;
2479                 }
2480                 cause->stale_time = htonl(staleness);
2481                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2482                     mflowtype, mflowid, l_inp->fibnum,
2483                     vrf_id, port);
2484                 return (NULL);
2485         }
2486         /*
2487          * Now we must see with the lookup address if we have an existing
2488          * asoc. This will only happen if we were in the COOKIE-WAIT state
2489          * and a INIT collided with us and somewhere the peer sent the
2490          * cookie on another address besides the single address our assoc
2491          * had for him. In this case we will have one of the tie-tags set at
2492          * least AND the address field in the cookie can be used to look it
2493          * up.
2494          */
2495         to = NULL;
2496         switch (cookie->addr_type) {
2497 #ifdef INET6
2498         case SCTP_IPV6_ADDRESS:
2499                 memset(&sin6, 0, sizeof(sin6));
2500                 sin6.sin6_family = AF_INET6;
2501                 sin6.sin6_len = sizeof(sin6);
2502                 sin6.sin6_port = sh->src_port;
2503                 sin6.sin6_scope_id = cookie->scope_id;
2504                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2505                     sizeof(sin6.sin6_addr.s6_addr));
2506                 to = (struct sockaddr *)&sin6;
2507                 break;
2508 #endif
2509 #ifdef INET
2510         case SCTP_IPV4_ADDRESS:
2511                 memset(&sin, 0, sizeof(sin));
2512                 sin.sin_family = AF_INET;
2513                 sin.sin_len = sizeof(sin);
2514                 sin.sin_port = sh->src_port;
2515                 sin.sin_addr.s_addr = cookie->address[0];
2516                 to = (struct sockaddr *)&sin;
2517                 break;
2518 #endif
2519         default:
2520                 /* This should not happen */
2521                 return (NULL);
2522         }
2523         if (*stcb == NULL) {
2524                 /* Yep, lets check */
2525                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2526                 if (*stcb == NULL) {
2527                         /*
2528                          * We should have only got back the same inp. If we
2529                          * got back a different ep we have a problem. The
2530                          * original findep got back l_inp and now
2531                          */
2532                         if (l_inp != *inp_p) {
2533                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2534                         }
2535                 } else {
2536                         if (*locked_tcb == NULL) {
2537                                 /*
2538                                  * In this case we found the assoc only
2539                                  * after we locked the create lock. This
2540                                  * means we are in a colliding case and we
2541                                  * must make sure that we unlock the tcb if
2542                                  * its one of the cases where we throw away
2543                                  * the incoming packets.
2544                                  */
2545                                 *locked_tcb = *stcb;
2546
2547                                 /*
2548                                  * We must also increment the inp ref count
2549                                  * since the ref_count flags was set when we
2550                                  * did not find the TCB, now we found it
2551                                  * which reduces the refcount.. we must
2552                                  * raise it back out to balance it all :-)
2553                                  */
2554                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2555                                 if ((*stcb)->sctp_ep != l_inp) {
2556                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2557                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2558                                 }
2559                         }
2560                 }
2561         }
2562
2563         cookie_len -= SCTP_SIGNATURE_SIZE;
2564         if (*stcb == NULL) {
2565                 /* this is the "normal" case... get a new TCB */
2566                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2567                     cookie, cookie_len, *inp_p,
2568                     netp, to, &notification,
2569                     auth_skipped, auth_offset, auth_len,
2570                     mflowtype, mflowid,
2571                     vrf_id, port);
2572         } else {
2573                 /* this is abnormal... cookie-echo on existing TCB */
2574                 had_a_existing_tcb = 1;
2575                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2576                     src, dst, sh,
2577                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2578                     &notification, auth_skipped, auth_offset, auth_len,
2579                     mflowtype, mflowid,
2580                     vrf_id, port);
2581                 if (*stcb == NULL) {
2582                         *locked_tcb = NULL;
2583                 }
2584         }
2585
2586         if (*stcb == NULL) {
2587                 /* still no TCB... must be bad cookie-echo */
2588                 return (NULL);
2589         }
2590         if (*netp != NULL) {
2591                 (*netp)->flowtype = mflowtype;
2592                 (*netp)->flowid = mflowid;
2593         }
2594         /*
2595          * Ok, we built an association so confirm the address we sent the
2596          * INIT-ACK to.
2597          */
2598         netl = sctp_findnet(*stcb, to);
2599         /*
2600          * This code should in theory NOT run but
2601          */
2602         if (netl == NULL) {
2603                 /* TSNH! Huh, why do I need to add this address here? */
2604                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2605                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2606                         return (NULL);
2607                 }
2608                 netl = sctp_findnet(*stcb, to);
2609         }
2610         if (netl) {
2611                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2612                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2613                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2614                             netl);
2615                         send_int_conf = 1;
2616                 }
2617         }
2618         sctp_start_net_timers(*stcb);
2619         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2620                 if (!had_a_existing_tcb ||
2621                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2622                         /*
2623                          * If we have a NEW cookie or the connect never
2624                          * reached the connected state during collision we
2625                          * must do the TCP accept thing.
2626                          */
2627                         struct socket *so, *oso;
2628                         struct sctp_inpcb *inp;
2629
2630                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2631                                 /*
2632                                  * For a restart we will keep the same
2633                                  * socket, no need to do anything. I THINK!!
2634                                  */
2635                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2636                                 if (send_int_conf) {
2637                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2638                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2639                                 }
2640                                 return (m);
2641                         }
2642                         oso = (*inp_p)->sctp_socket;
2643                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2644                         SCTP_TCB_UNLOCK((*stcb));
2645                         CURVNET_SET(oso->so_vnet);
2646                         so = sonewconn(oso, 0
2647                             );
2648                         CURVNET_RESTORE();
2649                         SCTP_TCB_LOCK((*stcb));
2650                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2651
2652                         if (so == NULL) {
2653                                 struct mbuf *op_err;
2654
2655                                 /* Too many sockets */
2656                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2657                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2658                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2659                                     src, dst, sh, op_err,
2660                                     mflowtype, mflowid,
2661                                     vrf_id, port);
2662                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2663                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2664                                 return (NULL);
2665                         }
2666                         inp = (struct sctp_inpcb *)so->so_pcb;
2667                         SCTP_INP_INCR_REF(inp);
2668                         /*
2669                          * We add the unbound flag here so that if we get an
2670                          * soabort() before we get the move_pcb done, we
2671                          * will properly cleanup.
2672                          */
2673                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2674                             SCTP_PCB_FLAGS_CONNECTED |
2675                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2676                             SCTP_PCB_FLAGS_UNBOUND |
2677                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2678                             SCTP_PCB_FLAGS_DONT_WAKE);
2679                         inp->sctp_features = (*inp_p)->sctp_features;
2680                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2681                         inp->sctp_socket = so;
2682                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2683                         inp->max_cwnd = (*inp_p)->max_cwnd;
2684                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2685                         inp->ecn_supported = (*inp_p)->ecn_supported;
2686                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2687                         inp->auth_supported = (*inp_p)->auth_supported;
2688                         inp->asconf_supported = (*inp_p)->asconf_supported;
2689                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2690                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2691                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2692                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2693                         inp->sctp_context = (*inp_p)->sctp_context;
2694                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2695                         inp->fibnum = (*inp_p)->fibnum;
2696                         inp->inp_starting_point_for_iterator = NULL;
2697                         /*
2698                          * copy in the authentication parameters from the
2699                          * original endpoint
2700                          */
2701                         if (inp->sctp_ep.local_hmacs)
2702                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2703                         inp->sctp_ep.local_hmacs =
2704                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2705                         if (inp->sctp_ep.local_auth_chunks)
2706                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2707                         inp->sctp_ep.local_auth_chunks =
2708                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2709
2710                         /*
2711                          * Now we must move it from one hash table to
2712                          * another and get the tcb in the right place.
2713                          */
2714
2715                         /*
2716                          * This is where the one-2-one socket is put into
2717                          * the accept state waiting for the accept!
2718                          */
2719                         if (*stcb) {
2720                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2721                         }
2722                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2723
2724                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2725                         SCTP_TCB_UNLOCK((*stcb));
2726
2727                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2728                             0);
2729                         SCTP_TCB_LOCK((*stcb));
2730                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2731
2732                         /*
2733                          * now we must check to see if we were aborted while
2734                          * the move was going on and the lock/unlock
2735                          * happened.
2736                          */
2737                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2738                                 /*
2739                                  * yep it was, we leave the assoc attached
2740                                  * to the socket since the sctp_inpcb_free()
2741                                  * call will send an abort for us.
2742                                  */
2743                                 SCTP_INP_DECR_REF(inp);
2744                                 return (NULL);
2745                         }
2746                         SCTP_INP_DECR_REF(inp);
2747                         /* Switch over to the new guy */
2748                         *inp_p = inp;
2749                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2750                         if (send_int_conf) {
2751                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2752                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2753                         }
2754
2755                         /*
2756                          * Pull it from the incomplete queue and wake the
2757                          * guy
2758                          */
2759                         soisconnected(so);
2760                         return (m);
2761                 }
2762         }
2763         if (notification) {
2764                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2765         }
2766         if (send_int_conf) {
2767                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2768                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2769         }
2770         return (m);
2771 }
2772
2773 static void
2774 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2775     struct sctp_tcb *stcb, struct sctp_nets *net)
2776 {
2777         /* cp must not be used, others call this without a c-ack :-) */
2778         struct sctp_association *asoc;
2779         struct sctp_tmit_chunk *chk;
2780
2781         SCTPDBG(SCTP_DEBUG_INPUT2,
2782             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2783         if ((stcb == NULL) || (net == NULL)) {
2784                 return;
2785         }
2786
2787         asoc = &stcb->asoc;
2788         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2789                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2790                     asoc->overall_error_count,
2791                     0,
2792                     SCTP_FROM_SCTP_INPUT,
2793                     __LINE__);
2794         }
2795         asoc->overall_error_count = 0;
2796         sctp_stop_all_cookie_timers(stcb);
2797         /* process according to association state */
2798         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2799                 /* state change only needed when I am in right state */
2800                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2801                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2802                 sctp_start_net_timers(stcb);
2803                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2804                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2805                             stcb->sctp_ep, stcb, NULL);
2806                 }
2807                 /* update RTO */
2808                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2809                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2810                 if (asoc->overall_error_count == 0) {
2811                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2812                             SCTP_RTT_FROM_NON_DATA);
2813                 }
2814                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2815                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2816                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2817                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2818                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2819                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2820                                 soisconnected(stcb->sctp_socket);
2821                         }
2822                 }
2823                 /*
2824                  * since we did not send a HB make sure we don't double
2825                  * things
2826                  */
2827                 net->hb_responded = 1;
2828
2829                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2830                         /*
2831                          * We don't need to do the asconf thing, nor hb or
2832                          * autoclose if the socket is closed.
2833                          */
2834                         goto closed_socket;
2835                 }
2836
2837                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2838                     stcb, net);
2839
2840                 if (stcb->asoc.sctp_autoclose_ticks &&
2841                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2842                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2843                             stcb->sctp_ep, stcb, NULL);
2844                 }
2845                 /*
2846                  * send ASCONF if parameters are pending and ASCONFs are
2847                  * allowed (eg. addresses changed when init/cookie echo were
2848                  * in flight)
2849                  */
2850                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2851                     (stcb->asoc.asconf_supported == 1) &&
2852                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2853 #ifdef SCTP_TIMER_BASED_ASCONF
2854                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2855                             stcb->sctp_ep, stcb,
2856                             stcb->asoc.primary_destination);
2857 #else
2858                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2859                             SCTP_ADDR_NOT_LOCKED);
2860 #endif
2861                 }
2862         }
2863 closed_socket:
2864         /* Toss the cookie if I can */
2865         sctp_toss_old_cookies(stcb, asoc);
2866         /* Restart the timer if we have pending data */
2867         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
2868                 if (chk->whoTo != NULL) {
2869                         break;
2870                 }
2871         }
2872         if (chk != NULL) {
2873                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2874         }
2875 }
2876
2877 static void
2878 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2879     struct sctp_tcb *stcb)
2880 {
2881         struct sctp_nets *net;
2882         struct sctp_tmit_chunk *lchk;
2883         struct sctp_ecne_chunk bkup;
2884         uint8_t override_bit;
2885         uint32_t tsn, window_data_tsn;
2886         int len;
2887         unsigned int pkt_cnt;
2888
2889         len = ntohs(cp->ch.chunk_length);
2890         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2891             (len != sizeof(struct old_sctp_ecne_chunk))) {
2892                 return;
2893         }
2894         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2895                 /* Its the old format */
2896                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2897                 bkup.num_pkts_since_cwr = htonl(1);
2898                 cp = &bkup;
2899         }
2900         SCTP_STAT_INCR(sctps_recvecne);
2901         tsn = ntohl(cp->tsn);
2902         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2903         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2904         if (lchk == NULL) {
2905                 window_data_tsn = stcb->asoc.sending_seq - 1;
2906         } else {
2907                 window_data_tsn = lchk->rec.data.tsn;
2908         }
2909
2910         /* Find where it was sent to if possible. */
2911         net = NULL;
2912         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2913                 if (lchk->rec.data.tsn == tsn) {
2914                         net = lchk->whoTo;
2915                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2916                         break;
2917                 }
2918                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
2919                         break;
2920                 }
2921         }
2922         if (net == NULL) {
2923                 /*
2924                  * What to do. A previous send of a CWR was possibly lost.
2925                  * See how old it is, we may have it marked on the actual
2926                  * net.
2927                  */
2928                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2929                         if (tsn == net->last_cwr_tsn) {
2930                                 /* Found him, send it off */
2931                                 break;
2932                         }
2933                 }
2934                 if (net == NULL) {
2935                         /*
2936                          * If we reach here, we need to send a special CWR
2937                          * that says hey, we did this a long time ago and
2938                          * you lost the response.
2939                          */
2940                         net = TAILQ_FIRST(&stcb->asoc.nets);
2941                         if (net == NULL) {
2942                                 /* TSNH */
2943                                 return;
2944                         }
2945                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2946                 } else {
2947                         override_bit = 0;
2948                 }
2949         } else {
2950                 override_bit = 0;
2951         }
2952         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2953             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2954                 /*
2955                  * JRS - Use the congestion control given in the pluggable
2956                  * CC module
2957                  */
2958                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2959                 /*
2960                  * We reduce once every RTT. So we will only lower cwnd at
2961                  * the next sending seq i.e. the window_data_tsn
2962                  */
2963                 net->cwr_window_tsn = window_data_tsn;
2964                 net->ecn_ce_pkt_cnt += pkt_cnt;
2965                 net->lost_cnt = pkt_cnt;
2966                 net->last_cwr_tsn = tsn;
2967         } else {
2968                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
2969                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
2970                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2971                         /*
2972                          * Another loss in the same window update how many
2973                          * marks/packets lost we have had.
2974                          */
2975                         int cnt = 1;
2976
2977                         if (pkt_cnt > net->lost_cnt) {
2978                                 /* Should be the case */
2979                                 cnt = (pkt_cnt - net->lost_cnt);
2980                                 net->ecn_ce_pkt_cnt += cnt;
2981                         }
2982                         net->lost_cnt = pkt_cnt;
2983                         net->last_cwr_tsn = tsn;
2984                         /*
2985                          * Most CC functions will ignore this call, since we
2986                          * are in-window yet of the initial CE the peer saw.
2987                          */
2988                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
2989                 }
2990         }
2991         /*
2992          * We always send a CWR this way if our previous one was lost our
2993          * peer will get an update, or if it is not time again to reduce we
2994          * still get the cwr to the peer. Note we set the override when we
2995          * could not find the TSN on the chunk or the destination network.
2996          */
2997         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
2998 }
2999
3000 static void
3001 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3002 {
3003         /*
3004          * Here we get a CWR from the peer. We must look in the outqueue and
3005          * make sure that we have a covered ECNE in the control chunk part.
3006          * If so remove it.
3007          */
3008         struct sctp_tmit_chunk *chk, *nchk;
3009         struct sctp_ecne_chunk *ecne;
3010         int override;
3011         uint32_t cwr_tsn;
3012
3013         cwr_tsn = ntohl(cp->tsn);
3014         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3015         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
3016                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3017                         continue;
3018                 }
3019                 if ((override == 0) && (chk->whoTo != net)) {
3020                         /* Must be from the right src unless override is set */
3021                         continue;
3022                 }
3023                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3024                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3025                         /* this covers this ECNE, we can remove it */
3026                         stcb->asoc.ecn_echo_cnt_onq--;
3027                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3028                             sctp_next);
3029                         stcb->asoc.ctrl_queue_cnt--;
3030                         sctp_m_freem(chk->data);
3031                         chk->data = NULL;
3032                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3033                         if (override == 0) {
3034                                 break;
3035                         }
3036                 }
3037         }
3038 }
3039
3040 static void
3041 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3042     struct sctp_tcb *stcb, struct sctp_nets *net)
3043 {
3044
3045         SCTPDBG(SCTP_DEBUG_INPUT2,
3046             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3047         if (stcb == NULL)
3048                 return;
3049
3050         /* process according to association state */
3051         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3052                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3053                 SCTPDBG(SCTP_DEBUG_INPUT2,
3054                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3055                 SCTP_TCB_UNLOCK(stcb);
3056                 return;
3057         }
3058         /* notify upper layer protocol */
3059         if (stcb->sctp_socket) {
3060                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3061         }
3062 #ifdef INVARIANTS
3063         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3064             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3065             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3066                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3067         }
3068 #endif
3069         /* stop the timer */
3070         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3071             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3072         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3073         /* free the TCB */
3074         SCTPDBG(SCTP_DEBUG_INPUT2,
3075             "sctp_handle_shutdown_complete: calls free-asoc\n");
3076         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3077             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3078         return;
3079 }
3080
3081 static int
3082 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3083     struct sctp_nets *net, uint8_t flg)
3084 {
3085         switch (desc->chunk_type) {
3086         case SCTP_DATA:
3087         case SCTP_IDATA:
3088                 /* find the tsn to resend (possibly) */
3089                 {
3090                         uint32_t tsn;
3091                         struct sctp_tmit_chunk *tp1;
3092
3093                         tsn = ntohl(desc->tsn_ifany);
3094                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3095                                 if (tp1->rec.data.tsn == tsn) {
3096                                         /* found it */
3097                                         break;
3098                                 }
3099                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3100                                         /* not found */
3101                                         tp1 = NULL;
3102                                         break;
3103                                 }
3104                         }
3105                         if (tp1 == NULL) {
3106                                 /*
3107                                  * Do it the other way , aka without paying
3108                                  * attention to queue seq order.
3109                                  */
3110                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3111                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3112                                         if (tp1->rec.data.tsn == tsn) {
3113                                                 /* found it */
3114                                                 break;
3115                                         }
3116                                 }
3117                         }
3118                         if (tp1 == NULL) {
3119                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3120                         }
3121                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3122                                 if (((flg & SCTP_BADCRC) == 0) &&
3123                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3124                                         return (0);
3125                                 }
3126                                 if ((stcb->asoc.peers_rwnd == 0) &&
3127                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3128                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3129                                         return (0);
3130                                 }
3131                                 if (stcb->asoc.peers_rwnd == 0 &&
3132                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3133                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3134                                         return (0);
3135                                 }
3136                                 if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
3137                                     SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
3138                                         /* Payload not matching. */
3139                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3140                                         return (-1);
3141                                 }
3142                                 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb),
3143                                     desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
3144                                         /* Payload not matching. */
3145                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3146                                         return (-1);
3147                                 }
3148                                 if (tp1->do_rtt) {
3149                                         /*
3150                                          * this guy had a RTO calculation
3151                                          * pending on it, cancel it
3152                                          */
3153                                         if (tp1->whoTo->rto_needed == 0) {
3154                                                 tp1->whoTo->rto_needed = 1;
3155                                         }
3156                                         tp1->do_rtt = 0;
3157                                 }
3158                                 SCTP_STAT_INCR(sctps_pdrpmark);
3159                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3160                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3161                                 /*
3162                                  * mark it as if we were doing a FR, since
3163                                  * we will be getting gap ack reports behind
3164                                  * the info from the router.
3165                                  */
3166                                 tp1->rec.data.doing_fast_retransmit = 1;
3167                                 /*
3168                                  * mark the tsn with what sequences can
3169                                  * cause a new FR.
3170                                  */
3171                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3172                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3173                                 } else {
3174                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3175                                 }
3176
3177                                 /* restart the timer */
3178                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3179                                     stcb, tp1->whoTo,
3180                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3181                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3182                                     stcb, tp1->whoTo);
3183
3184                                 /* fix counts and things */
3185                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3186                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3187                                             tp1->whoTo->flight_size,
3188                                             tp1->book_size,
3189                                             (uint32_t)(uintptr_t)stcb,
3190                                             tp1->rec.data.tsn);
3191                                 }
3192                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3193                                         sctp_flight_size_decrease(tp1);
3194                                         sctp_total_flight_decrease(stcb, tp1);
3195                                 }
3196                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3197                         } {
3198                                 /* audit code */
3199                                 unsigned int audit;
3200
3201                                 audit = 0;
3202                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3203                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3204                                                 audit++;
3205                                 }
3206                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3207                                     sctp_next) {
3208                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3209                                                 audit++;
3210                                 }
3211                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3212                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3213                                             audit, stcb->asoc.sent_queue_retran_cnt);
3214 #ifndef SCTP_AUDITING_ENABLED
3215                                         stcb->asoc.sent_queue_retran_cnt = audit;
3216 #endif
3217                                 }
3218                         }
3219                 }
3220                 break;
3221         case SCTP_ASCONF:
3222                 {
3223                         struct sctp_tmit_chunk *asconf;
3224
3225                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3226                             sctp_next) {
3227                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3228                                         break;
3229                                 }
3230                         }
3231                         if (asconf) {
3232                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3233                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3234                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3235                                 asconf->snd_count--;
3236                         }
3237                 }
3238                 break;
3239         case SCTP_INITIATION:
3240                 /* resend the INIT */
3241                 stcb->asoc.dropped_special_cnt++;
3242                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3243                         /*
3244                          * If we can get it in, in a few attempts we do
3245                          * this, otherwise we let the timer fire.
3246                          */
3247                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3248                             stcb, net,
3249                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3250                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3251                 }
3252                 break;
3253         case SCTP_SELECTIVE_ACK:
3254         case SCTP_NR_SELECTIVE_ACK:
3255                 /* resend the sack */
3256                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3257                 break;
3258         case SCTP_HEARTBEAT_REQUEST:
3259                 /* resend a demand HB */
3260                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3261                         /*
3262                          * Only retransmit if we KNOW we wont destroy the
3263                          * tcb
3264                          */
3265                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3266                 }
3267                 break;
3268         case SCTP_SHUTDOWN:
3269                 sctp_send_shutdown(stcb, net);
3270                 break;
3271         case SCTP_SHUTDOWN_ACK:
3272                 sctp_send_shutdown_ack(stcb, net);
3273                 break;
3274         case SCTP_COOKIE_ECHO:
3275                 {
3276                         struct sctp_tmit_chunk *cookie;
3277
3278                         cookie = NULL;
3279                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3280                             sctp_next) {
3281                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3282                                         break;
3283                                 }
3284                         }
3285                         if (cookie) {
3286                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3287                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3288                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3289                                 sctp_stop_all_cookie_timers(stcb);
3290                         }
3291                 }
3292                 break;
3293         case SCTP_COOKIE_ACK:
3294                 sctp_send_cookie_ack(stcb);
3295                 break;
3296         case SCTP_ASCONF_ACK:
3297                 /* resend last asconf ack */
3298                 sctp_send_asconf_ack(stcb);
3299                 break;
3300         case SCTP_IFORWARD_CUM_TSN:
3301         case SCTP_FORWARD_CUM_TSN:
3302                 send_forward_tsn(stcb, &stcb->asoc);
3303                 break;
3304                 /* can't do anything with these */
3305         case SCTP_PACKET_DROPPED:
3306         case SCTP_INITIATION_ACK:       /* this should not happen */
3307         case SCTP_HEARTBEAT_ACK:
3308         case SCTP_ABORT_ASSOCIATION:
3309         case SCTP_OPERATION_ERROR:
3310         case SCTP_SHUTDOWN_COMPLETE:
3311         case SCTP_ECN_ECHO:
3312         case SCTP_ECN_CWR:
3313         default:
3314                 break;
3315         }
3316         return (0);
3317 }
3318
3319 void
3320 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3321 {
3322         uint32_t i;
3323         uint16_t temp;
3324
3325         /*
3326          * We set things to 0xffffffff since this is the last delivered
3327          * sequence and we will be sending in 0 after the reset.
3328          */
3329
3330         if (number_entries) {
3331                 for (i = 0; i < number_entries; i++) {
3332                         temp = ntohs(list[i]);
3333                         if (temp >= stcb->asoc.streamincnt) {
3334                                 continue;
3335                         }
3336                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3337                 }
3338         } else {
3339                 list = NULL;
3340                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3341                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3342                 }
3343         }
3344         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3345 }
3346
3347 static void
3348 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3349 {
3350         uint32_t i;
3351         uint16_t temp;
3352
3353         if (number_entries > 0) {
3354                 for (i = 0; i < number_entries; i++) {
3355                         temp = ntohs(list[i]);
3356                         if (temp >= stcb->asoc.streamoutcnt) {
3357                                 /* no such stream */
3358                                 continue;
3359                         }
3360                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3361                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3362                 }
3363         } else {
3364                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3365                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3366                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3367                 }
3368         }
3369         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3370 }
3371
3372 static void
3373 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3374 {
3375         uint32_t i;
3376         uint16_t temp;
3377
3378         if (number_entries > 0) {
3379                 for (i = 0; i < number_entries; i++) {
3380                         temp = ntohs(list[i]);
3381                         if (temp >= stcb->asoc.streamoutcnt) {
3382                                 /* no such stream */
3383                                 continue;
3384                         }
3385                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3386                 }
3387         } else {
3388                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3389                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3390                 }
3391         }
3392 }
3393
3394 struct sctp_stream_reset_request *
3395 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3396 {
3397         struct sctp_association *asoc;
3398         struct sctp_chunkhdr *ch;
3399         struct sctp_stream_reset_request *r;
3400         struct sctp_tmit_chunk *chk;
3401         int len, clen;
3402
3403         asoc = &stcb->asoc;
3404         chk = asoc->str_reset;
3405         if (TAILQ_EMPTY(&asoc->control_send_queue) ||
3406             (chk == NULL)) {
3407                 asoc->stream_reset_outstanding = 0;
3408                 return (NULL);
3409         }
3410         if (chk->data == NULL) {
3411                 return (NULL);
3412         }
3413         if (bchk != NULL) {
3414                 /* he wants a copy of the chk pointer */
3415                 *bchk = chk;
3416         }
3417         clen = chk->send_size;
3418         ch = mtod(chk->data, struct sctp_chunkhdr *);
3419         r = (struct sctp_stream_reset_request *)(ch + 1);
3420         if (ntohl(r->request_seq) == seq) {
3421                 /* found it */
3422                 return (r);
3423         }
3424         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3425         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3426                 /* move to the next one, there can only be a max of two */
3427                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3428                 if (ntohl(r->request_seq) == seq) {
3429                         return (r);
3430                 }
3431         }
3432         /* that seq is not here */
3433         return (NULL);
3434 }
3435
3436 static void
3437 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3438 {
3439         struct sctp_association *asoc;
3440         struct sctp_tmit_chunk *chk;
3441
3442         asoc = &stcb->asoc;
3443         chk = asoc->str_reset;
3444         if (chk == NULL) {
3445                 return;
3446         }
3447         asoc->str_reset = NULL;
3448         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3449             NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3450         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3451         asoc->ctrl_queue_cnt--;
3452         if (chk->data) {
3453                 sctp_m_freem(chk->data);
3454                 chk->data = NULL;
3455         }
3456         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3457 }
3458
3459 static int
3460 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3461     uint32_t seq, uint32_t action,
3462     struct sctp_stream_reset_response *respin)
3463 {
3464         uint16_t type;
3465         int lparam_len;
3466         struct sctp_association *asoc = &stcb->asoc;
3467         struct sctp_tmit_chunk *chk;
3468         struct sctp_stream_reset_request *req_param;
3469         struct sctp_stream_reset_out_request *req_out_param;
3470         struct sctp_stream_reset_in_request *req_in_param;
3471         uint32_t number_entries;
3472
3473         if (asoc->stream_reset_outstanding == 0) {
3474                 /* duplicate */
3475                 return (0);
3476         }
3477         if (seq == stcb->asoc.str_reset_seq_out) {
3478                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3479                 if (req_param != NULL) {
3480                         stcb->asoc.str_reset_seq_out++;
3481                         type = ntohs(req_param->ph.param_type);
3482                         lparam_len = ntohs(req_param->ph.param_length);
3483                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3484                                 int no_clear = 0;
3485
3486                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3487                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3488                                 asoc->stream_reset_out_is_outstanding = 0;
3489                                 if (asoc->stream_reset_outstanding)
3490                                         asoc->stream_reset_outstanding--;
3491                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3492                                         /* do it */
3493                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3494                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3495                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3496                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3497                                         /*
3498                                          * Set it up so we don't stop
3499                                          * retransmitting
3500                                          */
3501                                         asoc->stream_reset_outstanding++;
3502                                         stcb->asoc.str_reset_seq_out--;
3503                                         asoc->stream_reset_out_is_outstanding = 1;
3504                                         no_clear = 1;
3505                                 } else {
3506                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3507                                 }
3508                                 if (no_clear == 0) {
3509                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3510                                 }
3511                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3512                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3513                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3514                                 if (asoc->stream_reset_outstanding)
3515                                         asoc->stream_reset_outstanding--;
3516                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3517                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3518                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3519                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3520                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3521                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3522                                 }
3523                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3524                                 /* Ok we now may have more streams */
3525                                 int num_stream;
3526
3527                                 num_stream = stcb->asoc.strm_pending_add_size;
3528                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3529                                         /* TSNH */
3530                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3531                                 }
3532                                 stcb->asoc.strm_pending_add_size = 0;
3533                                 if (asoc->stream_reset_outstanding)
3534                                         asoc->stream_reset_outstanding--;
3535                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3536                                         /* Put the new streams into effect */
3537                                         int i;
3538
3539                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3540                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3541                                         }
3542                                         asoc->streamoutcnt += num_stream;
3543                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3544                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3545                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3546                                             SCTP_STREAM_CHANGE_DENIED);
3547                                 } else {
3548                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3549                                             SCTP_STREAM_CHANGE_FAILED);
3550                                 }
3551                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3552                                 if (asoc->stream_reset_outstanding)
3553                                         asoc->stream_reset_outstanding--;
3554                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3555                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3556                                             SCTP_STREAM_CHANGE_DENIED);
3557                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3558                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3559                                             SCTP_STREAM_CHANGE_FAILED);
3560                                 }
3561                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3562                                 /**
3563                                  * a) Adopt the new in tsn.
3564                                  * b) reset the map
3565                                  * c) Adopt the new out-tsn
3566                                  */
3567                                 struct sctp_stream_reset_response_tsn *resp;
3568                                 struct sctp_forward_tsn_chunk fwdtsn;
3569                                 int abort_flag = 0;
3570
3571                                 if (respin == NULL) {
3572                                         /* huh ? */
3573                                         return (0);
3574                                 }
3575                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3576                                         return (0);
3577                                 }
3578                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3579                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3580                                         asoc->stream_reset_outstanding--;
3581                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3582                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3583                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3584                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3585                                         if (abort_flag) {
3586                                                 return (1);
3587                                         }
3588                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3589                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3590                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3591                                         }
3592
3593                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3594                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3595                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3596
3597                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3598                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3599
3600                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3601                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3602
3603                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3604                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3605                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3606                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3607                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3608                                             SCTP_ASSOC_RESET_DENIED);
3609                                 } else {
3610                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3611                                             SCTP_ASSOC_RESET_FAILED);
3612                                 }
3613                         }
3614                         /* get rid of the request and get the request flags */
3615                         if (asoc->stream_reset_outstanding == 0) {
3616                                 sctp_clean_up_stream_reset(stcb);
3617                         }
3618                 }
3619         }
3620         if (asoc->stream_reset_outstanding == 0) {
3621                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3622         }
3623         return (0);
3624 }
3625
3626 static void
3627 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3628     struct sctp_tmit_chunk *chk,
3629     struct sctp_stream_reset_in_request *req, int trunc)
3630 {
3631         uint32_t seq;
3632         int len, i;
3633         int number_entries;
3634         uint16_t temp;
3635
3636         /*
3637          * peer wants me to send a str-reset to him for my outgoing seq's if
3638          * seq_in is right.
3639          */
3640         struct sctp_association *asoc = &stcb->asoc;
3641
3642         seq = ntohl(req->request_seq);
3643         if (asoc->str_reset_seq_in == seq) {
3644                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3645                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3646                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3647                 } else if (trunc) {
3648                         /* Can't do it, since they exceeded our buffer size  */
3649                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3650                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3651                         len = ntohs(req->ph.param_length);
3652                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3653                         if (number_entries) {
3654                                 for (i = 0; i < number_entries; i++) {
3655                                         temp = ntohs(req->list_of_streams[i]);
3656                                         if (temp >= stcb->asoc.streamoutcnt) {
3657                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3658                                                 goto bad_boy;
3659                                         }
3660                                         req->list_of_streams[i] = temp;
3661                                 }
3662                                 for (i = 0; i < number_entries; i++) {
3663                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3664                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3665                                         }
3666                                 }
3667                         } else {
3668                                 /* Its all */
3669                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3670                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3671                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3672                                 }
3673                         }
3674                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3675                 } else {
3676                         /* Can't do it, since we have sent one out */
3677                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3678                 }
3679 bad_boy:
3680                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3681                 asoc->str_reset_seq_in++;
3682         } else if (asoc->str_reset_seq_in - 1 == seq) {
3683                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3684         } else if (asoc->str_reset_seq_in - 2 == seq) {
3685                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3686         } else {
3687                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3688         }
3689         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3690 }
3691
3692 static int
3693 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3694     struct sctp_tmit_chunk *chk,
3695     struct sctp_stream_reset_tsn_request *req)
3696 {
3697         /* reset all in and out and update the tsn */
3698         /*
3699          * A) reset my str-seq's on in and out. B) Select a receive next,
3700          * and set cum-ack to it. Also process this selected number as a
3701          * fwd-tsn as well. C) set in the response my next sending seq.
3702          */
3703         struct sctp_forward_tsn_chunk fwdtsn;
3704         struct sctp_association *asoc = &stcb->asoc;
3705         int abort_flag = 0;
3706         uint32_t seq;
3707
3708         seq = ntohl(req->request_seq);
3709         if (asoc->str_reset_seq_in == seq) {
3710                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3711                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3712                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3713                 } else {
3714                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3715                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3716                         fwdtsn.ch.chunk_flags = 0;
3717                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3718                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3719                         if (abort_flag) {
3720                                 return (1);
3721                         }
3722                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3723                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3724                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3725                         }
3726                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3727                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3728                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3729                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3730                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3731                         atomic_add_int(&asoc->sending_seq, 1);
3732                         /* save off historical data for retrans */
3733                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3734                         asoc->last_sending_seq[0] = asoc->sending_seq;
3735                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3736                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3737                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3738                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3739                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3740                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3741                 }
3742                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3743                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3744                 asoc->str_reset_seq_in++;
3745         } else if (asoc->str_reset_seq_in - 1 == seq) {
3746                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3747                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3748         } else if (asoc->str_reset_seq_in - 2 == seq) {
3749                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3750                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3751         } else {
3752                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3753         }
3754         return (0);
3755 }
3756
3757 static void
3758 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3759     struct sctp_tmit_chunk *chk,
3760     struct sctp_stream_reset_out_request *req, int trunc)
3761 {
3762         uint32_t seq, tsn;
3763         int number_entries, len;
3764         struct sctp_association *asoc = &stcb->asoc;
3765
3766         seq = ntohl(req->request_seq);
3767
3768         /* now if its not a duplicate we process it */
3769         if (asoc->str_reset_seq_in == seq) {
3770                 len = ntohs(req->ph.param_length);
3771                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3772                 /*
3773                  * the sender is resetting, handle the list issue.. we must
3774                  * a) verify if we can do the reset, if so no problem b) If
3775                  * we can't do the reset we must copy the request. c) queue
3776                  * it, and setup the data in processor to trigger it off
3777                  * when needed and dequeue all the queued data.
3778                  */
3779                 tsn = ntohl(req->send_reset_at_tsn);
3780
3781                 /* move the reset action back one */
3782                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3783                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3784                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3785                 } else if (trunc) {
3786                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3787                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3788                         /* we can do it now */
3789                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3790                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3791                 } else {
3792                         /*
3793                          * we must queue it up and thus wait for the TSN's
3794                          * to arrive that are at or before tsn
3795                          */
3796                         struct sctp_stream_reset_list *liste;
3797                         int siz;
3798
3799                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3800                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3801                             siz, SCTP_M_STRESET);
3802                         if (liste == NULL) {
3803                                 /* gak out of memory */
3804                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3805                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3806                                 return;
3807                         }
3808                         liste->seq = seq;
3809                         liste->tsn = tsn;
3810                         liste->number_entries = number_entries;
3811                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3812                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3813                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3814                 }
3815                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3816                 asoc->str_reset_seq_in++;
3817         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3818                 /*
3819                  * one seq back, just echo back last action since my
3820                  * response was lost.
3821                  */
3822                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3823         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3824                 /*
3825                  * two seq back, just echo back last action since my
3826                  * response was lost.
3827                  */
3828                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3829         } else {
3830                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3831         }
3832 }
3833
3834 static void
3835 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3836     struct sctp_stream_reset_add_strm *str_add)
3837 {
3838         /*
3839          * Peer is requesting to add more streams. If its within our
3840          * max-streams we will allow it.
3841          */
3842         uint32_t num_stream, i;
3843         uint32_t seq;
3844         struct sctp_association *asoc = &stcb->asoc;
3845         struct sctp_queued_to_read *ctl, *nctl;
3846
3847         /* Get the number. */
3848         seq = ntohl(str_add->request_seq);
3849         num_stream = ntohs(str_add->number_of_streams);
3850         /* Now what would be the new total? */
3851         if (asoc->str_reset_seq_in == seq) {
3852                 num_stream += stcb->asoc.streamincnt;
3853                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3854                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3855                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3856                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3857                     (num_stream > 0xffff)) {
3858                         /* We must reject it they ask for to many */
3859         denied:
3860                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3861                 } else {
3862                         /* Ok, we can do that :-) */
3863                         struct sctp_stream_in *oldstrm;
3864
3865                         /* save off the old */
3866                         oldstrm = stcb->asoc.strmin;
3867                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3868                             (num_stream * sizeof(struct sctp_stream_in)),
3869                             SCTP_M_STRMI);
3870                         if (stcb->asoc.strmin == NULL) {
3871                                 stcb->asoc.strmin = oldstrm;
3872                                 goto denied;
3873                         }
3874                         /* copy off the old data */
3875                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3876                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3877                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3878                                 stcb->asoc.strmin[i].sid = i;
3879                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
3880                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3881                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
3882                                 /* now anything on those queues? */
3883                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
3884                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
3885                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
3886                                 }
3887                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
3888                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
3889                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
3890                                 }
3891                         }
3892                         /* Init the new streams */
3893                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3894                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3895                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3896                                 stcb->asoc.strmin[i].sid = i;
3897                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3898                                 stcb->asoc.strmin[i].pd_api_started = 0;
3899                                 stcb->asoc.strmin[i].delivery_started = 0;
3900                         }
3901                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3902                         /* update the size */
3903                         stcb->asoc.streamincnt = num_stream;
3904                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3905                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3906                 }
3907                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3908                 asoc->str_reset_seq_in++;
3909         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3910                 /*
3911                  * one seq back, just echo back last action since my
3912                  * response was lost.
3913                  */
3914                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3915         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3916                 /*
3917                  * two seq back, just echo back last action since my
3918                  * response was lost.
3919                  */
3920                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3921         } else {
3922                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3923         }
3924 }
3925
3926 static void
3927 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3928     struct sctp_stream_reset_add_strm *str_add)
3929 {
3930         /*
3931          * Peer is requesting to add more streams. If its within our
3932          * max-streams we will allow it.
3933          */
3934         uint16_t num_stream;
3935         uint32_t seq;
3936         struct sctp_association *asoc = &stcb->asoc;
3937
3938         /* Get the number. */
3939         seq = ntohl(str_add->request_seq);
3940         num_stream = ntohs(str_add->number_of_streams);
3941         /* Now what would be the new total? */
3942         if (asoc->str_reset_seq_in == seq) {
3943                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3944                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3945                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3946                 } else if (stcb->asoc.stream_reset_outstanding) {
3947                         /* We must reject it we have something pending */
3948                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3949                 } else {
3950                         /* Ok, we can do that :-) */
3951                         int mychk;
3952
3953                         mychk = stcb->asoc.streamoutcnt;
3954                         mychk += num_stream;
3955                         if (mychk < 0x10000) {
3956                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3957                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
3958                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3959                                 }
3960                         } else {
3961                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3962                         }
3963                 }
3964                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
3965                 asoc->str_reset_seq_in++;
3966         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3967                 /*
3968                  * one seq back, just echo back last action since my
3969                  * response was lost.
3970                  */
3971                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3972         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3973                 /*
3974                  * two seq back, just echo back last action since my
3975                  * response was lost.
3976                  */
3977                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3978         } else {
3979                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3980         }
3981 }
3982
3983 #ifdef __GNUC__
3984 __attribute__((noinline))
3985 #endif
3986 static int
3987 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3988     struct sctp_chunkhdr *ch_req)
3989 {
3990         uint16_t remaining_length, param_len, ptype;
3991         struct sctp_paramhdr pstore;
3992         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3993         uint32_t seq = 0;
3994         int num_req = 0;
3995         int trunc = 0;
3996         struct sctp_tmit_chunk *chk;
3997         struct sctp_chunkhdr *ch;
3998         struct sctp_paramhdr *ph;
3999         int ret_code = 0;
4000         int num_param = 0;
4001
4002         /* now it may be a reset or a reset-response */
4003         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4004
4005         /* setup for adding the response */
4006         sctp_alloc_a_chunk(stcb, chk);
4007         if (chk == NULL) {
4008                 return (ret_code);
4009         }
4010         chk->copy_by_ref = 0;
4011         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4012         chk->rec.chunk_id.can_take_data = 0;
4013         chk->flags = 0;
4014         chk->asoc = &stcb->asoc;
4015         chk->no_fr_allowed = 0;
4016         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4017         chk->book_size_scale = 0;
4018         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4019         if (chk->data == NULL) {
4020 strres_nochunk:
4021                 if (chk->data) {
4022                         sctp_m_freem(chk->data);
4023                         chk->data = NULL;
4024                 }
4025                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4026                 return (ret_code);
4027         }
4028         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4029
4030         /* setup chunk parameters */
4031         chk->sent = SCTP_DATAGRAM_UNSENT;
4032         chk->snd_count = 0;
4033         chk->whoTo = NULL;
4034
4035         ch = mtod(chk->data, struct sctp_chunkhdr *);
4036         ch->chunk_type = SCTP_STREAM_RESET;
4037         ch->chunk_flags = 0;
4038         ch->chunk_length = htons(chk->send_size);
4039         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4040         offset += sizeof(struct sctp_chunkhdr);
4041         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4042                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4043                 if (ph == NULL) {
4044                         /* TSNH */
4045                         break;
4046                 }
4047                 param_len = ntohs(ph->param_length);
4048                 if ((param_len > remaining_length) ||
4049                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4050                         /* bad parameter length */
4051                         break;
4052                 }
4053                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4054                     (uint8_t *)&cstore);
4055                 if (ph == NULL) {
4056                         /* TSNH */
4057                         break;
4058                 }
4059                 ptype = ntohs(ph->param_type);
4060                 num_param++;
4061                 if (param_len > sizeof(cstore)) {
4062                         trunc = 1;
4063                 } else {
4064                         trunc = 0;
4065                 }
4066                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4067                         /* hit the max of parameters already sorry.. */
4068                         break;
4069                 }
4070                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4071                         struct sctp_stream_reset_out_request *req_out;
4072
4073                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4074                                 break;
4075                         }
4076                         req_out = (struct sctp_stream_reset_out_request *)ph;
4077                         num_req++;
4078                         if (stcb->asoc.stream_reset_outstanding) {
4079                                 seq = ntohl(req_out->response_seq);
4080                                 if (seq == stcb->asoc.str_reset_seq_out) {
4081                                         /* implicit ack */
4082                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4083                                 }
4084                         }
4085                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4086                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4087                         struct sctp_stream_reset_add_strm *str_add;
4088
4089                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4090                                 break;
4091                         }
4092                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4093                         num_req++;
4094                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4095                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4096                         struct sctp_stream_reset_add_strm *str_add;
4097
4098                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4099                                 break;
4100                         }
4101                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4102                         num_req++;
4103                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4104                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4105                         struct sctp_stream_reset_in_request *req_in;
4106
4107                         num_req++;
4108                         req_in = (struct sctp_stream_reset_in_request *)ph;
4109                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4110                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4111                         struct sctp_stream_reset_tsn_request *req_tsn;
4112
4113                         num_req++;
4114                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4115                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4116                                 ret_code = 1;
4117                                 goto strres_nochunk;
4118                         }
4119                         /* no more */
4120                         break;
4121                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4122                         struct sctp_stream_reset_response *resp;
4123                         uint32_t result;
4124
4125                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4126                                 break;
4127                         }
4128                         resp = (struct sctp_stream_reset_response *)ph;
4129                         seq = ntohl(resp->response_seq);
4130                         result = ntohl(resp->result);
4131                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4132                                 ret_code = 1;
4133                                 goto strres_nochunk;
4134                         }
4135                 } else {
4136                         break;
4137                 }
4138                 offset += SCTP_SIZE32(param_len);
4139                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4140                         remaining_length -= SCTP_SIZE32(param_len);
4141                 } else {
4142                         remaining_length = 0;
4143                 }
4144         }
4145         if (num_req == 0) {
4146                 /* we have no response free the stuff */
4147                 goto strres_nochunk;
4148         }
4149         /* ok we have a chunk to link in */
4150         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4151             chk,
4152             sctp_next);
4153         stcb->asoc.ctrl_queue_cnt++;
4154         return (ret_code);
4155 }
4156
4157 /*
4158  * Handle a router or endpoints report of a packet loss, there are two ways
4159  * to handle this, either we get the whole packet and must disect it
4160  * ourselves (possibly with truncation and or corruption) or it is a summary
4161  * from a middle box that did the disectting for us.
4162  */
4163 static void
4164 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4165     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4166 {
4167         struct sctp_chunk_desc desc;
4168         struct sctp_chunkhdr *chk_hdr;
4169         struct sctp_data_chunk *data_chunk;
4170         struct sctp_idata_chunk *idata_chunk;
4171         uint32_t bottle_bw, on_queue;
4172         uint32_t offset, chk_len;
4173         uint16_t pktdrp_len;
4174         uint8_t pktdrp_flags;
4175
4176         KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
4177             ("PKTDROP chunk too small"));
4178         pktdrp_flags = cp->ch.chunk_flags;
4179         pktdrp_len = ntohs(cp->ch.chunk_length);
4180         KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
4181         if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
4182                 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
4183                         /* The peer plays games with us. */
4184                         return;
4185                 }
4186         }
4187         limit -= sizeof(struct sctp_pktdrop_chunk);
4188         offset = 0;
4189         if (offset == limit) {
4190                 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4191                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4192                 }
4193         } else if (offset + sizeof(struct sctphdr) > limit) {
4194                 /* Only a partial SCTP common header. */
4195                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4196                 offset = limit;
4197         } else {
4198                 /* XXX: Check embedded SCTP common header. */
4199                 offset += sizeof(struct sctphdr);
4200         }
4201         /* Now parse through the chunks themselves. */
4202         while (offset < limit) {
4203                 if (offset + sizeof(struct sctp_chunkhdr) > limit) {
4204                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4205                         break;
4206                 }
4207                 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
4208                 desc.chunk_type = chk_hdr->chunk_type;
4209                 /* get amount we need to move */
4210                 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
4211                 if (chk_len < sizeof(struct sctp_chunkhdr)) {
4212                         /* Someone is lying... */
4213                         break;
4214                 }
4215                 if (desc.chunk_type == SCTP_DATA) {
4216                         if (stcb->asoc.idata_supported) {
4217                                 /* Some is playing games with us. */
4218                                 break;
4219                         }
4220                         if (chk_len <= sizeof(struct sctp_data_chunk)) {
4221                                 /* Some is playing games with us. */
4222                                 break;
4223                         }
4224                         if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4225                                 /*
4226                                  * Not enough data bytes available in the
4227                                  * chunk.
4228                                  */
4229                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4230                                 goto next_chunk;
4231                         }
4232                         if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4233                                 /* Not enough data in buffer. */
4234                                 break;
4235                         }
4236                         data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
4237                         memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4238                         desc.tsn_ifany = data_chunk->dp.tsn;
4239                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4240                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4241                         }
4242                 } else if (desc.chunk_type == SCTP_IDATA) {
4243                         if (!stcb->asoc.idata_supported) {
4244                                 /* Some is playing games with us. */
4245                                 break;
4246                         }
4247                         if (chk_len <= sizeof(struct sctp_idata_chunk)) {
4248                                 /* Some is playing games with us. */
4249                                 break;
4250                         }
4251                         if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4252                                 /*
4253                                  * Not enough data bytes available in the
4254                                  * chunk.
4255                                  */
4256                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4257                                 goto next_chunk;
4258                         }
4259                         if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4260                                 /* Not enough data in buffer. */
4261                                 break;
4262                         }
4263                         idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
4264                         memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4265                         desc.tsn_ifany = idata_chunk->dp.tsn;
4266                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4267                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4268                         }
4269                 } else {
4270                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4271                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4272                         }
4273                 }
4274                 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
4275                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4276                         break;
4277                 }
4278 next_chunk:
4279                 offset += SCTP_SIZE32(chk_len);
4280         }
4281         /* Now update any rwnd --- possibly */
4282         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4283                 /* From a peer, we get a rwnd report */
4284                 uint32_t a_rwnd;
4285
4286                 SCTP_STAT_INCR(sctps_pdrpfehos);
4287
4288                 bottle_bw = ntohl(cp->bottle_bw);
4289                 on_queue = ntohl(cp->current_onq);
4290                 if (bottle_bw && on_queue) {
4291                         /* a rwnd report is in here */
4292                         if (bottle_bw > on_queue)
4293                                 a_rwnd = bottle_bw - on_queue;
4294                         else
4295                                 a_rwnd = 0;
4296
4297                         if (a_rwnd == 0)
4298                                 stcb->asoc.peers_rwnd = 0;
4299                         else {
4300                                 if (a_rwnd > stcb->asoc.total_flight) {
4301                                         stcb->asoc.peers_rwnd =
4302                                             a_rwnd - stcb->asoc.total_flight;
4303                                 } else {
4304                                         stcb->asoc.peers_rwnd = 0;
4305                                 }
4306                                 if (stcb->asoc.peers_rwnd <
4307                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4308                                         /* SWS sender side engages */
4309                                         stcb->asoc.peers_rwnd = 0;
4310                                 }
4311                         }
4312                 }
4313         } else {
4314                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4315         }
4316
4317         /* now middle boxes in sat networks get a cwnd bump */
4318         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
4319             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4320             (stcb->asoc.sat_network)) {
4321                 /*
4322                  * This is debatable but for sat networks it makes sense
4323                  * Note if a T3 timer has went off, we will prohibit any
4324                  * changes to cwnd until we exit the t3 loss recovery.
4325                  */
4326                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4327                     net, cp, &bottle_bw, &on_queue);
4328         }
4329 }
4330
4331 /*
4332  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4333  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4334  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4335  * length of the complete packet outputs: - length: modified to remaining
4336  * length after control processing - netp: modified to new sctp_nets after
4337  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4338  * bad packet,...) otherwise return the tcb for this packet
4339  */
4340 #ifdef __GNUC__
4341 __attribute__((noinline))
4342 #endif
4343 static struct sctp_tcb *
4344 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4345     struct sockaddr *src, struct sockaddr *dst,
4346     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4347     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4348     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4349     uint32_t vrf_id, uint16_t port)
4350 {
4351         struct sctp_association *asoc;
4352         struct mbuf *op_err;
4353         char msg[SCTP_DIAG_INFO_LEN];
4354         uint32_t vtag_in;
4355         int num_chunks = 0;     /* number of control chunks processed */
4356         uint32_t chk_length, contiguous;
4357         int ret;
4358         int abort_no_unlock = 0;
4359         int ecne_seen = 0;
4360         int abort_flag;
4361
4362         /*
4363          * How big should this be, and should it be alloc'd? Lets try the
4364          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4365          * until we get into jumbo grams and such..
4366          */
4367         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4368         int got_auth = 0;
4369         uint32_t auth_offset = 0, auth_len = 0;
4370         int auth_skipped = 0;
4371         int asconf_cnt = 0;
4372
4373         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4374             iphlen, *offset, length, (void *)stcb);
4375
4376         if (stcb) {
4377                 SCTP_TCB_LOCK_ASSERT(stcb);
4378         }
4379         /* validate chunk header length... */
4380         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4381                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4382                     ntohs(ch->chunk_length));
4383                 *offset = length;
4384                 return (stcb);
4385         }
4386         /*
4387          * validate the verification tag
4388          */
4389         vtag_in = ntohl(sh->v_tag);
4390
4391         if (ch->chunk_type == SCTP_INITIATION) {
4392                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4393                     ntohs(ch->chunk_length), vtag_in);
4394                 if (vtag_in != 0) {
4395                         /* protocol error- silently discard... */
4396                         SCTP_STAT_INCR(sctps_badvtag);
4397                         if (stcb != NULL) {
4398                                 SCTP_TCB_UNLOCK(stcb);
4399                         }
4400                         return (NULL);
4401                 }
4402         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4403                 /*
4404                  * If there is no stcb, skip the AUTH chunk and process
4405                  * later after a stcb is found (to validate the lookup was
4406                  * valid.
4407                  */
4408                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4409                     (stcb == NULL) &&
4410                     (inp->auth_supported == 1)) {
4411                         /* save this chunk for later processing */
4412                         auth_skipped = 1;
4413                         auth_offset = *offset;
4414                         auth_len = ntohs(ch->chunk_length);
4415
4416                         /* (temporarily) move past this chunk */
4417                         *offset += SCTP_SIZE32(auth_len);
4418                         if (*offset >= length) {
4419                                 /* no more data left in the mbuf chain */
4420                                 *offset = length;
4421                                 return (NULL);
4422                         }
4423                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4424                             sizeof(struct sctp_chunkhdr), chunk_buf);
4425                 }
4426                 if (ch == NULL) {
4427                         /* Help */
4428                         *offset = length;
4429                         return (stcb);
4430                 }
4431                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4432                         goto process_control_chunks;
4433                 }
4434                 /*
4435                  * first check if it's an ASCONF with an unknown src addr we
4436                  * need to look inside to find the association
4437                  */
4438                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4439                         struct sctp_chunkhdr *asconf_ch = ch;
4440                         uint32_t asconf_offset = 0, asconf_len = 0;
4441
4442                         /* inp's refcount may be reduced */
4443                         SCTP_INP_INCR_REF(inp);
4444
4445                         asconf_offset = *offset;
4446                         do {
4447                                 asconf_len = ntohs(asconf_ch->chunk_length);
4448                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4449                                         break;
4450                                 stcb = sctp_findassociation_ep_asconf(m,
4451                                     *offset,
4452                                     dst,
4453                                     sh, &inp, netp, vrf_id);
4454                                 if (stcb != NULL)
4455                                         break;
4456                                 asconf_offset += SCTP_SIZE32(asconf_len);
4457                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4458                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4459                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4460                         if (stcb == NULL) {
4461                                 /*
4462                                  * reduce inp's refcount if not reduced in
4463                                  * sctp_findassociation_ep_asconf().
4464                                  */
4465                                 SCTP_INP_DECR_REF(inp);
4466                         }
4467
4468                         /* now go back and verify any auth chunk to be sure */
4469                         if (auth_skipped && (stcb != NULL)) {
4470                                 struct sctp_auth_chunk *auth;
4471
4472                                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
4473                                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
4474                                         got_auth = 1;
4475                                         auth_skipped = 0;
4476                                 } else {
4477                                         auth = NULL;
4478                                 }
4479                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4480                                     auth_offset)) {
4481                                         /* auth HMAC failed so dump it */
4482                                         *offset = length;
4483                                         return (stcb);
4484                                 } else {
4485                                         /* remaining chunks are HMAC checked */
4486                                         stcb->asoc.authenticated = 1;
4487                                 }
4488                         }
4489                 }
4490                 if (stcb == NULL) {
4491                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4492                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4493                             msg);
4494                         /* no association, so it's out of the blue... */
4495                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4496                             mflowtype, mflowid, inp->fibnum,
4497                             vrf_id, port);
4498                         *offset = length;
4499                         return (NULL);
4500                 }
4501                 asoc = &stcb->asoc;
4502                 /* ABORT and SHUTDOWN can use either v_tag... */
4503                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4504                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4505                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4506                         /* Take the T-bit always into account. */
4507                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4508                             (vtag_in == asoc->my_vtag)) ||
4509                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4510                             (asoc->peer_vtag != htonl(0)) &&
4511                             (vtag_in == asoc->peer_vtag))) {
4512                                 /* this is valid */
4513                         } else {
4514                                 /* drop this packet... */
4515                                 SCTP_STAT_INCR(sctps_badvtag);
4516                                 if (stcb != NULL) {
4517                                         SCTP_TCB_UNLOCK(stcb);
4518                                 }
4519                                 return (NULL);
4520                         }
4521                 } else {
4522                         /* for all other chunks, vtag must match */
4523                         if (vtag_in != asoc->my_vtag) {
4524                                 /* invalid vtag... */
4525                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4526                                     "invalid vtag: %xh, expect %xh\n",
4527                                     vtag_in, asoc->my_vtag);
4528                                 SCTP_STAT_INCR(sctps_badvtag);
4529                                 if (stcb != NULL) {
4530                                         SCTP_TCB_UNLOCK(stcb);
4531                                 }
4532                                 *offset = length;
4533                                 return (NULL);
4534                         }
4535                 }
4536         }                       /* end if !SCTP_COOKIE_ECHO */
4537         /*
4538          * process all control chunks...
4539          */
4540         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4541             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4542             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4543             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4544                 /* implied cookie-ack.. we must have lost the ack */
4545                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4546                     *netp);
4547         }
4548
4549 process_control_chunks:
4550         while (IS_SCTP_CONTROL(ch)) {
4551                 /* validate chunk length */
4552                 chk_length = ntohs(ch->chunk_length);
4553                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4554                     ch->chunk_type, chk_length);
4555                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4556                 if (chk_length < sizeof(*ch) ||
4557                     (*offset + (int)chk_length) > length) {
4558                         *offset = length;
4559                         return (stcb);
4560                 }
4561                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4562                 /*
4563                  * INIT and INIT-ACK only gets the init ack "header" portion
4564                  * only because we don't have to process the peer's COOKIE.
4565                  * All others get a complete chunk.
4566                  */
4567                 switch (ch->chunk_type) {
4568                 case SCTP_INITIATION:
4569                         contiguous = sizeof(struct sctp_init_chunk);
4570                         break;
4571                 case SCTP_INITIATION_ACK:
4572                         contiguous = sizeof(struct sctp_init_ack_chunk);
4573                         break;
4574                 default:
4575                         contiguous = min(chk_length, sizeof(chunk_buf));
4576                         break;
4577                 }
4578                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4579                     contiguous,
4580                     chunk_buf);
4581                 if (ch == NULL) {
4582                         *offset = length;
4583                         return (stcb);
4584                 }
4585
4586                 num_chunks++;
4587                 /* Save off the last place we got a control from */
4588                 if (stcb != NULL) {
4589                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4590                                 /*
4591                                  * allow last_control to be NULL if
4592                                  * ASCONF... ASCONF processing will find the
4593                                  * right net later
4594                                  */
4595                                 if ((netp != NULL) && (*netp != NULL))
4596                                         stcb->asoc.last_control_chunk_from = *netp;
4597                         }
4598                 }
4599 #ifdef SCTP_AUDITING_ENABLED
4600                 sctp_audit_log(0xB0, ch->chunk_type);
4601 #endif
4602
4603                 /* check to see if this chunk required auth, but isn't */
4604                 if ((stcb != NULL) &&
4605                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4606                     !stcb->asoc.authenticated) {
4607                         /* "silently" ignore */
4608                         SCTP_STAT_INCR(sctps_recvauthmissing);
4609                         goto next_chunk;
4610                 }
4611                 switch (ch->chunk_type) {
4612                 case SCTP_INITIATION:
4613                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4614                         /* The INIT chunk must be the only chunk. */
4615                         if ((num_chunks > 1) ||
4616                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4617                                 /*
4618                                  * RFC 4960bis requires stopping the
4619                                  * processing of the packet.
4620                                  */
4621                                 *offset = length;
4622                                 return (stcb);
4623                         }
4624                         /* Honor our resource limit. */
4625                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4626                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4627                                 sctp_abort_association(inp, stcb, m, iphlen,
4628                                     src, dst, sh, op_err,
4629                                     mflowtype, mflowid,
4630                                     vrf_id, port);
4631                                 *offset = length;
4632                                 return (NULL);
4633                         }
4634                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4635                             (struct sctp_init_chunk *)ch, inp,
4636                             stcb, *netp, &abort_no_unlock,
4637                             mflowtype, mflowid,
4638                             vrf_id, port);
4639                         *offset = length;
4640                         if ((!abort_no_unlock) && (stcb != NULL)) {
4641                                 SCTP_TCB_UNLOCK(stcb);
4642                         }
4643                         return (NULL);
4644                         break;
4645                 case SCTP_PAD_CHUNK:
4646                         break;
4647                 case SCTP_INITIATION_ACK:
4648                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4649                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4650                                 /* We are not interested anymore */
4651                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4652                                         ;
4653                                 } else {
4654                                         *offset = length;
4655                                         if (stcb != NULL) {
4656                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4657                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4658                                         }
4659                                         return (NULL);
4660                                 }
4661                         }
4662                         /* The INIT-ACK chunk must be the only chunk. */
4663                         if ((num_chunks > 1) ||
4664                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4665                                 *offset = length;
4666                                 return (stcb);
4667                         }
4668                         if ((netp != NULL) && (*netp != NULL)) {
4669                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4670                                     src, dst, sh,
4671                                     (struct sctp_init_ack_chunk *)ch,
4672                                     stcb, *netp,
4673                                     &abort_no_unlock,
4674                                     mflowtype, mflowid,
4675                                     vrf_id);
4676                         } else {
4677                                 ret = -1;
4678                         }
4679                         *offset = length;
4680                         if (abort_no_unlock) {
4681                                 return (NULL);
4682                         }
4683                         /*
4684                          * Special case, I must call the output routine to
4685                          * get the cookie echoed
4686                          */
4687                         if ((stcb != NULL) && (ret == 0)) {
4688                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4689                         }
4690                         return (stcb);
4691                         break;
4692                 case SCTP_SELECTIVE_ACK:
4693                 case SCTP_NR_SELECTIVE_ACK:
4694                         {
4695                                 int abort_now = 0;
4696                                 uint32_t a_rwnd, cum_ack;
4697                                 uint16_t num_seg, num_nr_seg, num_dup;
4698                                 uint8_t flags;
4699                                 int offset_seg, offset_dup;
4700
4701                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4702                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4703                                 SCTP_STAT_INCR(sctps_recvsacks);
4704                                 if (stcb == NULL) {
4705                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4706                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4707                                         break;
4708                                 }
4709                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4710                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4711                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4712                                                 break;
4713                                         }
4714                                 } else {
4715                                         if (stcb->asoc.nrsack_supported == 0) {
4716                                                 goto unknown_chunk;
4717                                         }
4718                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4719                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4720                                                 break;
4721                                         }
4722                                 }
4723                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4724                                         /*-
4725                                          * If we have sent a shutdown-ack, we will pay no
4726                                          * attention to a sack sent in to us since
4727                                          * we don't care anymore.
4728                                          */
4729                                         break;
4730                                 }
4731                                 flags = ch->chunk_flags;
4732                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4733                                         struct sctp_sack_chunk *sack;
4734
4735                                         sack = (struct sctp_sack_chunk *)ch;
4736                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4737                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4738                                         num_nr_seg = 0;
4739                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4740                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4741                                         if (sizeof(struct sctp_sack_chunk) +
4742                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4743                                             num_dup * sizeof(uint32_t) != chk_length) {
4744                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4745                                                 break;
4746                                         }
4747                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4748                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4749                                 } else {
4750                                         struct sctp_nr_sack_chunk *nr_sack;
4751
4752                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4753                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4754                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4755                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4756                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4757                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4758                                         if (sizeof(struct sctp_nr_sack_chunk) +
4759                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4760                                             num_dup * sizeof(uint32_t) != chk_length) {
4761                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4762                                                 break;
4763                                         }
4764                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4765                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4766                                 }
4767                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4768                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4769                                     cum_ack, num_seg, a_rwnd);
4770                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4771                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4772                                     (num_seg == 0) && (num_nr_seg == 0) &&
4773                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4774                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4775                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4776                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4777                                         /*
4778                                          * We have a SIMPLE sack having no
4779                                          * prior segments and data on sent
4780                                          * queue to be acked. Use the faster
4781                                          * path sack processing. We also
4782                                          * allow window update sacks with no
4783                                          * missing segments to go this way
4784                                          * too.
4785                                          */
4786                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4787                                             &abort_now, ecne_seen);
4788                                 } else {
4789                                         if ((netp != NULL) && (*netp != NULL)) {
4790                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4791                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4792                                                     cum_ack, a_rwnd, ecne_seen);
4793                                         }
4794                                 }
4795                                 if (abort_now) {
4796                                         /* ABORT signal from sack processing */
4797                                         *offset = length;
4798                                         return (NULL);
4799                                 }
4800                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4801                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4802                                     (stcb->asoc.stream_queue_cnt == 0)) {
4803                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4804                                 }
4805                                 break;
4806                         }
4807                 case SCTP_HEARTBEAT_REQUEST:
4808                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4809                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4810                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4811                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4812                                     chk_length, *netp);
4813                         }
4814                         break;
4815                 case SCTP_HEARTBEAT_ACK:
4816                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
4817                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4818                                 /* Its not ours */
4819                                 break;
4820                         }
4821                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4822                         if ((netp != NULL) && (*netp != NULL)) {
4823                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4824                                     stcb, *netp);
4825                         }
4826                         break;
4827                 case SCTP_ABORT_ASSOCIATION:
4828                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4829                             (void *)stcb);
4830                         *offset = length;
4831                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4832                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
4833                                         return (NULL);
4834                                 } else {
4835                                         return (stcb);
4836                                 }
4837                         } else {
4838                                 return (NULL);
4839                         }
4840                         break;
4841                 case SCTP_SHUTDOWN:
4842                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4843                             (void *)stcb);
4844                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4845                                 break;
4846                         }
4847                         if ((netp != NULL) && (*netp != NULL)) {
4848                                 abort_flag = 0;
4849                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4850                                     stcb, *netp, &abort_flag);
4851                                 if (abort_flag) {
4852                                         *offset = length;
4853                                         return (NULL);
4854                                 }
4855                         }
4856                         break;
4857                 case SCTP_SHUTDOWN_ACK:
4858                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
4859                         if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) &&
4860                             (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4861                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4862                                 *offset = length;
4863                                 return (NULL);
4864                         }
4865                         break;
4866                 case SCTP_OPERATION_ERROR:
4867                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
4868                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
4869                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
4870                                 *offset = length;
4871                                 return (NULL);
4872                         }
4873                         break;
4874                 case SCTP_COOKIE_ECHO:
4875                         SCTPDBG(SCTP_DEBUG_INPUT3,
4876                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
4877                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
4878                                 ;
4879                         } else {
4880                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4881                                         /* We are not interested anymore */
4882                         abend:
4883                                         if (stcb != NULL) {
4884                                                 SCTP_TCB_UNLOCK(stcb);
4885                                         }
4886                                         *offset = length;
4887                                         return (NULL);
4888                                 }
4889                         }
4890                         /*-
4891                          * First are we accepting? We do this again here
4892                          * since it is possible that a previous endpoint WAS
4893                          * listening responded to a INIT-ACK and then
4894                          * closed. We opened and bound.. and are now no
4895                          * longer listening.
4896                          *
4897                          * XXXGL: notes on checking listen queue length.
4898                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
4899                          *    SOLISTENING(), because a listening "UDP type"
4900                          *    socket isn't listening in terms of the socket
4901                          *    layer.  It is a normal data flow socket, that
4902                          *    can fork off new connections.  Thus, we should
4903                          *    look into sol_qlen only in case we are !UDP.
4904                          * 2) Checking sol_qlen in general requires locking
4905                          *    the socket, and this code lacks that.
4906                          */
4907                         if ((stcb == NULL) &&
4908                             (!SCTP_IS_LISTENING(inp) ||
4909                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
4910                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
4911                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4912                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4913                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4914                                         sctp_abort_association(inp, stcb, m, iphlen,
4915                                             src, dst, sh, op_err,
4916                                             mflowtype, mflowid,
4917                                             vrf_id, port);
4918                                 }
4919                                 *offset = length;
4920                                 return (NULL);
4921                         } else {
4922                                 struct mbuf *ret_buf;
4923                                 struct sctp_inpcb *linp;
4924                                 struct sctp_tmit_chunk *chk;
4925
4926                                 if (stcb) {
4927                                         linp = NULL;
4928                                 } else {
4929                                         linp = inp;
4930                                 }
4931
4932                                 if (linp != NULL) {
4933                                         SCTP_ASOC_CREATE_LOCK(linp);
4934                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
4935                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4936                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
4937                                                 goto abend;
4938                                         }
4939                                 }
4940
4941                                 if (netp != NULL) {
4942                                         struct sctp_tcb *locked_stcb;
4943
4944                                         locked_stcb = stcb;
4945                                         ret_buf =
4946                                             sctp_handle_cookie_echo(m, iphlen,
4947                                             *offset,
4948                                             src, dst,
4949                                             sh,
4950                                             (struct sctp_cookie_echo_chunk *)ch,
4951                                             &inp, &stcb, netp,
4952                                             auth_skipped,
4953                                             auth_offset,
4954                                             auth_len,
4955                                             &locked_stcb,
4956                                             mflowtype,
4957                                             mflowid,
4958                                             vrf_id,
4959                                             port);
4960                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
4961                                                 SCTP_TCB_UNLOCK(locked_stcb);
4962                                         }
4963                                         if (stcb != NULL) {
4964                                                 SCTP_TCB_LOCK_ASSERT(stcb);
4965                                         }
4966                                 } else {
4967                                         ret_buf = NULL;
4968                                 }
4969                                 if (linp != NULL) {
4970                                         SCTP_ASOC_CREATE_UNLOCK(linp);
4971                                 }
4972                                 if (ret_buf == NULL) {
4973                                         if (stcb != NULL) {
4974                                                 SCTP_TCB_UNLOCK(stcb);
4975                                         }
4976                                         SCTPDBG(SCTP_DEBUG_INPUT3,
4977                                             "GAK, null buffer\n");
4978                                         *offset = length;
4979                                         return (NULL);
4980                                 }
4981                                 /* if AUTH skipped, see if it verified... */
4982                                 if (auth_skipped) {
4983                                         got_auth = 1;
4984                                         auth_skipped = 0;
4985                                 }
4986                                 /* Restart the timer if we have pending data */
4987                                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
4988                                         if (chk->whoTo != NULL) {
4989                                                 break;
4990                                         }
4991                                 }
4992                                 if (chk != NULL) {
4993                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
4994                                 }
4995                         }
4996                         break;
4997                 case SCTP_COOKIE_ACK:
4998                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
4999                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5000                                 break;
5001                         }
5002                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5003                                 /* We are not interested anymore */
5004                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5005                                         ;
5006                                 } else if (stcb) {
5007                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5008                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5009                                         *offset = length;
5010                                         return (NULL);
5011                                 }
5012                         }
5013                         if ((netp != NULL) && (*netp != NULL)) {
5014                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5015                         }
5016                         break;
5017                 case SCTP_ECN_ECHO:
5018                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5019                         if (stcb == NULL) {
5020                                 break;
5021                         }
5022                         if (stcb->asoc.ecn_supported == 0) {
5023                                 goto unknown_chunk;
5024                         }
5025                         if (chk_length != sizeof(struct sctp_ecne_chunk)) {
5026                                 break;
5027                         }
5028                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5029                         ecne_seen = 1;
5030                         break;
5031                 case SCTP_ECN_CWR:
5032                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5033                         if (stcb == NULL) {
5034                                 break;
5035                         }
5036                         if (stcb->asoc.ecn_supported == 0) {
5037                                 goto unknown_chunk;
5038                         }
5039                         if (chk_length != sizeof(struct sctp_cwr_chunk)) {
5040                                 break;
5041                         }
5042                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5043                         break;
5044                 case SCTP_SHUTDOWN_COMPLETE:
5045                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5046                         /* must be first and only chunk */
5047                         if ((num_chunks > 1) ||
5048                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5049                                 *offset = length;
5050                                 return (stcb);
5051                         }
5052                         if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) &&
5053                             (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5054                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5055                                     stcb, *netp);
5056                                 *offset = length;
5057                                 return (NULL);
5058                         }
5059                         break;
5060                 case SCTP_ASCONF:
5061                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5062                         if (stcb != NULL) {
5063                                 if (stcb->asoc.asconf_supported == 0) {
5064                                         goto unknown_chunk;
5065                                 }
5066                                 sctp_handle_asconf(m, *offset, src,
5067                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5068                                 asconf_cnt++;
5069                         }
5070                         break;
5071                 case SCTP_ASCONF_ACK:
5072                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5073                         if (stcb == NULL) {
5074                                 break;
5075                         }
5076                         if (stcb->asoc.asconf_supported == 0) {
5077                                 goto unknown_chunk;
5078                         }
5079                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5080                                 break;
5081                         }
5082                         if ((netp != NULL) && (*netp != NULL)) {
5083                                 /* He's alive so give him credit */
5084                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5085                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5086                                             stcb->asoc.overall_error_count,
5087                                             0,
5088                                             SCTP_FROM_SCTP_INPUT,
5089                                             __LINE__);
5090                                 }
5091                                 stcb->asoc.overall_error_count = 0;
5092                                 sctp_handle_asconf_ack(m, *offset,
5093                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5094                                 if (abort_no_unlock)
5095                                         return (NULL);
5096                         }
5097                         break;
5098                 case SCTP_FORWARD_CUM_TSN:
5099                 case SCTP_IFORWARD_CUM_TSN:
5100                         SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5101                             ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
5102                         if (stcb == NULL) {
5103                                 break;
5104                         }
5105                         if (stcb->asoc.prsctp_supported == 0) {
5106                                 goto unknown_chunk;
5107                         }
5108                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5109                                 break;
5110                         }
5111                         if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
5112                             ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
5113                                 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
5114                                         SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
5115                                 } else {
5116                                         SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
5117                                 }
5118                                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5119                                 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
5120                                 *offset = length;
5121                                 return (NULL);
5122                         }
5123                         *fwd_tsn_seen = 1;
5124                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5125                                 /* We are not interested anymore */
5126                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5127                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5128                                 *offset = length;
5129                                 return (NULL);
5130                         }
5131                         /*
5132                          * For sending a SACK this looks like DATA chunks.
5133                          */
5134                         stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5135                         abort_flag = 0;
5136                         sctp_handle_forward_tsn(stcb,
5137                             (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5138                         if (abort_flag) {
5139                                 *offset = length;
5140                                 return (NULL);
5141                         }
5142                         break;
5143                 case SCTP_STREAM_RESET:
5144                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5145                         if (stcb == NULL) {
5146                                 break;
5147                         }
5148                         if (stcb->asoc.reconfig_supported == 0) {
5149                                 goto unknown_chunk;
5150                         }
5151                         if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) {
5152                                 break;
5153                         }
5154                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5155                                 /* stop processing */
5156                                 *offset = length;
5157                                 return (NULL);
5158                         }
5159                         break;
5160                 case SCTP_PACKET_DROPPED:
5161                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5162                         if (stcb == NULL) {
5163                                 break;
5164                         }
5165                         if (stcb->asoc.pktdrop_supported == 0) {
5166                                 goto unknown_chunk;
5167                         }
5168                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5169                                 break;
5170                         }
5171                         if ((netp != NULL) && (*netp != NULL)) {
5172                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5173                                     stcb, *netp,
5174                                     min(chk_length, contiguous));
5175                         }
5176                         break;
5177                 case SCTP_AUTHENTICATION:
5178                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5179                         if (stcb == NULL) {
5180                                 /* save the first AUTH for later processing */
5181                                 if (auth_skipped == 0) {
5182                                         auth_offset = *offset;
5183                                         auth_len = chk_length;
5184                                         auth_skipped = 1;
5185                                 }
5186                                 /* skip this chunk (temporarily) */
5187                                 break;
5188                         }
5189                         if (stcb->asoc.auth_supported == 0) {
5190                                 goto unknown_chunk;
5191                         }
5192                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5193                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5194                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5195                                 /* Its not ours */
5196                                 *offset = length;
5197                                 return (stcb);
5198                         }
5199                         if (got_auth == 1) {
5200                                 /* skip this chunk... it's already auth'd */
5201                                 break;
5202                         }
5203                         got_auth = 1;
5204                         if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
5205                                 /* auth HMAC failed so dump the packet */
5206                                 *offset = length;
5207                                 return (stcb);
5208                         } else {
5209                                 /* remaining chunks are HMAC checked */
5210                                 stcb->asoc.authenticated = 1;
5211                         }
5212                         break;
5213
5214                 default:
5215         unknown_chunk:
5216                         /* it's an unknown chunk! */
5217                         if ((ch->chunk_type & 0x40) &&
5218                             (stcb != NULL) &&
5219                             (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
5220                             (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
5221                             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5222                                 struct sctp_gen_error_cause *cause;
5223                                 int len;
5224
5225                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5226                                     0, M_NOWAIT, 1, MT_DATA);
5227                                 if (op_err != NULL) {
5228                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5229                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5230                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5231                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5232                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5233                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5234                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5235 #ifdef SCTP_MBUF_LOGGING
5236                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5237                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5238                                                 }
5239 #endif
5240                                                 sctp_queue_op_err(stcb, op_err);
5241                                         } else {
5242                                                 sctp_m_freem(op_err);
5243                                         }
5244                                 }
5245                         }
5246                         if ((ch->chunk_type & 0x80) == 0) {
5247                                 /* discard this packet */
5248                                 *offset = length;
5249                                 return (stcb);
5250                         }       /* else skip this bad chunk and continue... */
5251                         break;
5252                 }               /* switch (ch->chunk_type) */
5253
5254 next_chunk:
5255                 /* get the next chunk */
5256                 *offset += SCTP_SIZE32(chk_length);
5257                 if (*offset >= length) {
5258                         /* no more data left in the mbuf chain */
5259                         break;
5260                 }
5261                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5262                     sizeof(struct sctp_chunkhdr), chunk_buf);
5263                 if (ch == NULL) {
5264                         *offset = length;
5265                         return (stcb);
5266                 }
5267         }                       /* while */
5268
5269         if ((asconf_cnt > 0) && (stcb != NULL)) {
5270                 sctp_send_asconf_ack(stcb);
5271         }
5272         return (stcb);
5273 }
5274
5275 /*
5276  * common input chunk processing (v4 and v6)
5277  */
5278 void
5279 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5280     struct sockaddr *src, struct sockaddr *dst,
5281     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5282     uint8_t compute_crc,
5283     uint8_t ecn_bits,
5284     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5285     uint32_t vrf_id, uint16_t port)
5286 {
5287         uint32_t high_tsn;
5288         int fwd_tsn_seen = 0, data_processed = 0;
5289         struct mbuf *m = *mm, *op_err;
5290         char msg[SCTP_DIAG_INFO_LEN];
5291         int un_sent;
5292         int cnt_ctrl_ready = 0;
5293         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5294         struct sctp_tcb *stcb = NULL;
5295         struct sctp_nets *net = NULL;
5296
5297         SCTP_STAT_INCR(sctps_recvdatagrams);
5298 #ifdef SCTP_AUDITING_ENABLED
5299         sctp_audit_log(0xE0, 1);
5300         sctp_auditing(0, inp, stcb, net);
5301 #endif
5302         if (compute_crc != 0) {
5303                 uint32_t check, calc_check;
5304
5305                 check = sh->checksum;
5306                 sh->checksum = 0;
5307                 calc_check = sctp_calculate_cksum(m, iphlen);
5308                 sh->checksum = check;
5309                 if (calc_check != check) {
5310                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5311                             calc_check, check, (void *)m, length, iphlen);
5312                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5313                             sh, ch, &inp, &net, vrf_id);
5314 #if defined(INET) || defined(INET6)
5315                         if ((ch->chunk_type != SCTP_INITIATION) &&
5316                             (net != NULL) && (net->port != port)) {
5317                                 if (net->port == 0) {
5318                                         /* UDP encapsulation turned on. */
5319                                         net->mtu -= sizeof(struct udphdr);
5320                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5321                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5322                                         }
5323                                 } else if (port == 0) {
5324                                         /* UDP encapsulation turned off. */
5325                                         net->mtu += sizeof(struct udphdr);
5326                                         /* XXX Update smallest_mtu */
5327                                 }
5328                                 net->port = port;
5329                         }
5330 #endif
5331                         if (net != NULL) {
5332                                 net->flowtype = mflowtype;
5333                                 net->flowid = mflowid;
5334                         }
5335                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5336                         if ((inp != NULL) && (stcb != NULL)) {
5337                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5338                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5339                         } else if ((inp != NULL) && (stcb == NULL)) {
5340                                 inp_decr = inp;
5341                         }
5342                         SCTP_STAT_INCR(sctps_badsum);
5343                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5344                         goto out;
5345                 }
5346         }
5347         /* Destination port of 0 is illegal, based on RFC4960. */
5348         if (sh->dest_port == 0) {
5349                 SCTP_STAT_INCR(sctps_hdrops);
5350                 goto out;
5351         }
5352         stcb = sctp_findassociation_addr(m, offset, src, dst,
5353             sh, ch, &inp, &net, vrf_id);
5354 #if defined(INET) || defined(INET6)
5355         if ((ch->chunk_type != SCTP_INITIATION) &&
5356             (net != NULL) && (net->port != port)) {
5357                 if (net->port == 0) {
5358                         /* UDP encapsulation turned on. */
5359                         net->mtu -= sizeof(struct udphdr);
5360                         if (stcb->asoc.smallest_mtu > net->mtu) {
5361                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5362                         }
5363                 } else if (port == 0) {
5364                         /* UDP encapsulation turned off. */
5365                         net->mtu += sizeof(struct udphdr);
5366                         /* XXX Update smallest_mtu */
5367                 }
5368                 net->port = port;
5369         }
5370 #endif
5371         if (net != NULL) {
5372                 net->flowtype = mflowtype;
5373                 net->flowid = mflowid;
5374         }
5375         if (inp == NULL) {
5376                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5377                 SCTP_STAT_INCR(sctps_noport);
5378                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5379                         goto out;
5380                 }
5381                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5382                         sctp_send_shutdown_complete2(src, dst, sh,
5383                             mflowtype, mflowid, fibnum,
5384                             vrf_id, port);
5385                         goto out;
5386                 }
5387                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5388                         goto out;
5389                 }
5390                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5391                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5392                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5393                             (ch->chunk_type != SCTP_INIT))) {
5394                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5395                                     "Out of the blue");
5396                                 sctp_send_abort(m, iphlen, src, dst,
5397                                     sh, 0, op_err,
5398                                     mflowtype, mflowid, fibnum,
5399                                     vrf_id, port);
5400                         }
5401                 }
5402                 goto out;
5403         } else if (stcb == NULL) {
5404                 inp_decr = inp;
5405         }
5406         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5407             (void *)m, iphlen, offset, length, (void *)stcb);
5408         if (stcb) {
5409                 /* always clear this before beginning a packet */
5410                 stcb->asoc.authenticated = 0;
5411                 stcb->asoc.seen_a_sack_this_pkt = 0;
5412                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5413                     (void *)stcb, stcb->asoc.state);
5414
5415                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5416                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5417                         /*-
5418                          * If we hit here, we had a ref count
5419                          * up when the assoc was aborted and the
5420                          * timer is clearing out the assoc, we should
5421                          * NOT respond to any packet.. its OOTB.
5422                          */
5423                         SCTP_TCB_UNLOCK(stcb);
5424                         stcb = NULL;
5425                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5426                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5427                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5428                             msg);
5429                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5430                             mflowtype, mflowid, inp->fibnum,
5431                             vrf_id, port);
5432                         goto out;
5433                 }
5434         }
5435         if (IS_SCTP_CONTROL(ch)) {
5436                 /* process the control portion of the SCTP packet */
5437                 /* sa_ignore NO_NULL_CHK */
5438                 stcb = sctp_process_control(m, iphlen, &offset, length,
5439                     src, dst, sh, ch,
5440                     inp, stcb, &net, &fwd_tsn_seen,
5441                     mflowtype, mflowid, fibnum,
5442                     vrf_id, port);
5443                 if (stcb) {
5444                         /*
5445                          * This covers us if the cookie-echo was there and
5446                          * it changes our INP.
5447                          */
5448                         inp = stcb->sctp_ep;
5449 #if defined(INET) || defined(INET6)
5450                         if ((ch->chunk_type != SCTP_INITIATION) &&
5451                             (net != NULL) && (net->port != port)) {
5452                                 if (net->port == 0) {
5453                                         /* UDP encapsulation turned on. */
5454                                         net->mtu -= sizeof(struct udphdr);
5455                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5456                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5457                                         }
5458                                 } else if (port == 0) {
5459                                         /* UDP encapsulation turned off. */
5460                                         net->mtu += sizeof(struct udphdr);
5461                                         /* XXX Update smallest_mtu */
5462                                 }
5463                                 net->port = port;
5464                         }
5465 #endif
5466                 }
5467         } else {
5468                 /*
5469                  * no control chunks, so pre-process DATA chunks (these
5470                  * checks are taken care of by control processing)
5471                  */
5472
5473                 /*
5474                  * if DATA only packet, and auth is required, then punt...
5475                  * can't have authenticated without any AUTH (control)
5476                  * chunks
5477                  */
5478                 if ((stcb != NULL) &&
5479                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5480                         /* "silently" ignore */
5481                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5482                         SCTP_STAT_INCR(sctps_recvauthmissing);
5483                         goto out;
5484                 }
5485                 if (stcb == NULL) {
5486                         /* out of the blue DATA chunk */
5487                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5488                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5489                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5490                             msg);
5491                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5492                             mflowtype, mflowid, fibnum,
5493                             vrf_id, port);
5494                         goto out;
5495                 }
5496                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5497                         /* v_tag mismatch! */
5498                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5499                         SCTP_STAT_INCR(sctps_badvtag);
5500                         goto out;
5501                 }
5502         }
5503
5504         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5505         if (stcb == NULL) {
5506                 /*
5507                  * no valid TCB for this packet, or we found it's a bad
5508                  * packet while processing control, or we're done with this
5509                  * packet (done or skip rest of data), so we drop it...
5510                  */
5511                 goto out;
5512         }
5513
5514         /*
5515          * DATA chunk processing
5516          */
5517         /* plow through the data chunks while length > offset */
5518
5519         /*
5520          * Rest should be DATA only.  Check authentication state if AUTH for
5521          * DATA is required.
5522          */
5523         if ((length > offset) &&
5524             (stcb != NULL) &&
5525             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5526             !stcb->asoc.authenticated) {
5527                 /* "silently" ignore */
5528                 SCTP_STAT_INCR(sctps_recvauthmissing);
5529                 SCTPDBG(SCTP_DEBUG_AUTH1,
5530                     "Data chunk requires AUTH, skipped\n");
5531                 goto trigger_send;
5532         }
5533         if (length > offset) {
5534                 int retval;
5535
5536                 /*
5537                  * First check to make sure our state is correct. We would
5538                  * not get here unless we really did have a tag, so we don't
5539                  * abort if this happens, just dump the chunk silently.
5540                  */
5541                 switch (SCTP_GET_STATE(stcb)) {
5542                 case SCTP_STATE_COOKIE_ECHOED:
5543                         /*
5544                          * we consider data with valid tags in this state
5545                          * shows us the cookie-ack was lost. Imply it was
5546                          * there.
5547                          */
5548                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5549                         break;
5550                 case SCTP_STATE_COOKIE_WAIT:
5551                         /*
5552                          * We consider OOTB any data sent during asoc setup.
5553                          */
5554                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5555                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5556                             msg);
5557                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5558                             mflowtype, mflowid, inp->fibnum,
5559                             vrf_id, port);
5560                         goto out;
5561                         /* sa_ignore NOTREACHED */
5562                         break;
5563                 case SCTP_STATE_EMPTY:  /* should not happen */
5564                 case SCTP_STATE_INUSE:  /* should not happen */
5565                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5566                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5567                 default:
5568                         goto out;
5569                         /* sa_ignore NOTREACHED */
5570                         break;
5571                 case SCTP_STATE_OPEN:
5572                 case SCTP_STATE_SHUTDOWN_SENT:
5573                         break;
5574                 }
5575                 /* plow through the data chunks while length > offset */
5576                 retval = sctp_process_data(mm, iphlen, &offset, length,
5577                     inp, stcb, net, &high_tsn);
5578                 if (retval == 2) {
5579                         /*
5580                          * The association aborted, NO UNLOCK needed since
5581                          * the association is destroyed.
5582                          */
5583                         stcb = NULL;
5584                         goto out;
5585                 }
5586                 if (retval == 0) {
5587                         data_processed = 1;
5588                 }
5589                 /*
5590                  * Anything important needs to have been m_copy'ed in
5591                  * process_data
5592                  */
5593         }
5594
5595         /* take care of ecn */
5596         if ((data_processed == 1) &&
5597             (stcb->asoc.ecn_supported == 1) &&
5598             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5599                 /* Yep, we need to add a ECNE */
5600                 sctp_send_ecn_echo(stcb, net, high_tsn);
5601         }
5602
5603         if ((data_processed == 0) && (fwd_tsn_seen)) {
5604                 int was_a_gap;
5605                 uint32_t highest_tsn;
5606
5607                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5608                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5609                 } else {
5610                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5611                 }
5612                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5613                 stcb->asoc.send_sack = 1;
5614                 sctp_sack_check(stcb, was_a_gap);
5615         } else if (fwd_tsn_seen) {
5616                 stcb->asoc.send_sack = 1;
5617         }
5618         /* trigger send of any chunks in queue... */
5619 trigger_send:
5620 #ifdef SCTP_AUDITING_ENABLED
5621         sctp_audit_log(0xE0, 2);
5622         sctp_auditing(1, inp, stcb, net);
5623 #endif
5624         SCTPDBG(SCTP_DEBUG_INPUT1,
5625             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5626             stcb->asoc.peers_rwnd,
5627             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5628             stcb->asoc.total_flight);
5629         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5630         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5631                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5632         }
5633         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5634             cnt_ctrl_ready ||
5635             stcb->asoc.trigger_reset ||
5636             ((un_sent > 0) &&
5637             (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
5638                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5639                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5640                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5641         }
5642 #ifdef SCTP_AUDITING_ENABLED
5643         sctp_audit_log(0xE0, 3);
5644         sctp_auditing(2, inp, stcb, net);
5645 #endif
5646 out:
5647         if (stcb != NULL) {
5648                 SCTP_TCB_UNLOCK(stcb);
5649         }
5650         if (inp_decr != NULL) {
5651                 /* reduce ref-count */
5652                 SCTP_INP_WLOCK(inp_decr);
5653                 SCTP_INP_DECR_REF(inp_decr);
5654                 SCTP_INP_WUNLOCK(inp_decr);
5655         }
5656         return;
5657 }
5658
5659 #ifdef INET
5660 void
5661 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5662 {
5663         struct mbuf *m;
5664         int iphlen;
5665         uint32_t vrf_id = 0;
5666         uint8_t ecn_bits;
5667         struct sockaddr_in src, dst;
5668         struct ip *ip;
5669         struct sctphdr *sh;
5670         struct sctp_chunkhdr *ch;
5671         int length, offset;
5672         uint8_t compute_crc;
5673         uint32_t mflowid;
5674         uint8_t mflowtype;
5675         uint16_t fibnum;
5676
5677         iphlen = off;
5678         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5679                 SCTP_RELEASE_PKT(i_pak);
5680                 return;
5681         }
5682         m = SCTP_HEADER_TO_CHAIN(i_pak);
5683 #ifdef SCTP_MBUF_LOGGING
5684         /* Log in any input mbufs */
5685         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5686                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5687         }
5688 #endif
5689 #ifdef SCTP_PACKET_LOGGING
5690         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5691                 sctp_packet_log(m);
5692         }
5693 #endif
5694         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5695             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5696             m->m_pkthdr.len,
5697             if_name(m->m_pkthdr.rcvif),
5698             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5699         mflowid = m->m_pkthdr.flowid;
5700         mflowtype = M_HASHTYPE_GET(m);
5701         fibnum = M_GETFIB(m);
5702         SCTP_STAT_INCR(sctps_recvpackets);
5703         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5704         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5705         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5706         if (SCTP_BUF_LEN(m) < offset) {
5707                 if ((m = m_pullup(m, offset)) == NULL) {
5708                         SCTP_STAT_INCR(sctps_hdrops);
5709                         return;
5710                 }
5711         }
5712         ip = mtod(m, struct ip *);
5713         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5714         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5715         offset -= sizeof(struct sctp_chunkhdr);
5716         memset(&src, 0, sizeof(struct sockaddr_in));
5717         src.sin_family = AF_INET;
5718         src.sin_len = sizeof(struct sockaddr_in);
5719         src.sin_port = sh->src_port;
5720         src.sin_addr = ip->ip_src;
5721         memset(&dst, 0, sizeof(struct sockaddr_in));
5722         dst.sin_family = AF_INET;
5723         dst.sin_len = sizeof(struct sockaddr_in);
5724         dst.sin_port = sh->dest_port;
5725         dst.sin_addr = ip->ip_dst;
5726         length = ntohs(ip->ip_len);
5727         /* Validate mbuf chain length with IP payload length. */
5728         if (SCTP_HEADER_LEN(m) != length) {
5729                 SCTPDBG(SCTP_DEBUG_INPUT1,
5730                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5731                 SCTP_STAT_INCR(sctps_hdrops);
5732                 goto out;
5733         }
5734         /* SCTP does not allow broadcasts or multicasts */
5735         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5736                 goto out;
5737         }
5738         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5739                 goto out;
5740         }
5741         ecn_bits = ip->ip_tos;
5742         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5743                 SCTP_STAT_INCR(sctps_recvhwcrc);
5744                 compute_crc = 0;
5745         } else {
5746                 SCTP_STAT_INCR(sctps_recvswcrc);
5747                 compute_crc = 1;
5748         }
5749         sctp_common_input_processing(&m, iphlen, offset, length,
5750             (struct sockaddr *)&src,
5751             (struct sockaddr *)&dst,
5752             sh, ch,
5753             compute_crc,
5754             ecn_bits,
5755             mflowtype, mflowid, fibnum,
5756             vrf_id, port);
5757 out:
5758         if (m) {
5759                 sctp_m_freem(m);
5760         }
5761         return;
5762 }
5763
5764 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5765 extern int *sctp_cpuarry;
5766 #endif
5767
5768 int
5769 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
5770 {
5771         struct mbuf *m;
5772         int off;
5773
5774         m = *mp;
5775         off = *offp;
5776 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5777         if (mp_ncpus > 1) {
5778                 struct ip *ip;
5779                 struct sctphdr *sh;
5780                 int offset;
5781                 int cpu_to_use;
5782                 uint32_t flowid, tag;
5783
5784                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
5785                         flowid = m->m_pkthdr.flowid;
5786                 } else {
5787                         /*
5788                          * No flow id built by lower layers fix it so we
5789                          * create one.
5790                          */
5791                         offset = off + sizeof(struct sctphdr);
5792                         if (SCTP_BUF_LEN(m) < offset) {
5793                                 if ((m = m_pullup(m, offset)) == NULL) {
5794                                         SCTP_STAT_INCR(sctps_hdrops);
5795                                         return (IPPROTO_DONE);
5796                                 }
5797                         }
5798                         ip = mtod(m, struct ip *);
5799                         sh = (struct sctphdr *)((caddr_t)ip + off);
5800                         tag = htonl(sh->v_tag);
5801                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5802                         m->m_pkthdr.flowid = flowid;
5803                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
5804                 }
5805                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5806                 sctp_queue_to_mcore(m, off, cpu_to_use);
5807                 return (IPPROTO_DONE);
5808         }
5809 #endif
5810         sctp_input_with_port(m, off, 0);
5811         return (IPPROTO_DONE);
5812 }
5813 #endif