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 <netinet/sctp_os.h>
  36 #include <netinet/sctp_var.h>
  37 #include <netinet/sctp_sysctl.h>
  38 #include <netinet/sctp_pcb.h>
  39 #include <netinet/sctp_header.h>
  40 #include <netinet/sctputil.h>
  41 #include <netinet/sctp_output.h>
  42 #include <netinet/sctp_input.h>
  43 #include <netinet/sctp_auth.h>
  44 #include <netinet/sctp_indata.h>
  45 #include <netinet/sctp_asconf.h>
  46 #include <netinet/sctp_bsd_addr.h>
  47 #include <netinet/sctp_timer.h>
  48 #include <netinet/sctp_crc32.h>
  49 #include <netinet/sctp_kdtrace.h>
  50 #if defined(INET) || defined(INET6)
  51 #include <netinet/udp.h>
  52 #endif
  53 #include <sys/smp.h>
  54
  55 static void
  56 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  57 {
  58         struct sctp_nets *net;
  59
  60         /*
  61          * This now not only stops all cookie timers it also stops any INIT
  62          * timers as well. This will make sure that the timers are stopped
  63          * in all collision cases.
  64          */
  65         SCTP_TCB_LOCK_ASSERT(stcb);
  66         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  67                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  68                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  69                             stcb->sctp_ep,
  70                             stcb,
  71                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  72                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  73                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  74                             stcb->sctp_ep,
  75                             stcb,
  76                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  77                 }
  78         }
  79 }
  80
  81 /* INIT handler */
  82 static void
  83 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  84     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  85     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  86     struct sctp_tcb *stcb, struct sctp_nets *net,
  87     uint8_t mflowtype, uint32_t mflowid,
  88     uint32_t vrf_id, uint16_t port)
  89 {
  90         struct sctp_init *init;
  91         struct mbuf *op_err;
  92
  93         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  94             (void *)stcb);
  95         if (stcb == NULL) {
  96                 SCTP_INP_RLOCK(inp);
  97         }
  98         /* Validate parameters */
  99         init = &cp->init;
 100         if (ntohl(init->initiate_tag) == 0) {
 101                 goto outnow;
 102         }
 103         if ((ntohl(init->a_rwnd) < SCTP_MIN_RWND) ||
 104             (ntohs(init->num_inbound_streams) == 0) ||
 105             (ntohs(init->num_outbound_streams) == 0)) {
 106                 /* protocol error... send abort */
 107                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 108                 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err,
 109                     mflowtype, mflowid, inp->fibnum,
 110                     vrf_id, port);
 111                 goto outnow;
 112         }
 113         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 114             offset + ntohs(cp->ch.chunk_length))) {
 115                 /* auth parameter(s) error... send abort */
 116                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 117                     "Problem with AUTH parameters");
 118                 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err,
 119                     mflowtype, mflowid, inp->fibnum,
 120                     vrf_id, port);
 121                 goto outnow;
 122         }
 123         /* We are only accepting if we have a listening socket. */
 124         if ((stcb == NULL) &&
 125             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 126             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 127             (!SCTP_IS_LISTENING(inp)))) {
 128                 /*
 129                  * FIX ME ?? What about TCP model and we have a
 130                  * match/restart case? Actually no fix is needed. the lookup
 131                  * will always find the existing assoc so stcb would not be
 132                  * NULL. It may be questionable to do this since we COULD
 133                  * just send back the INIT-ACK and hope that the app did
 134                  * accept()'s by the time the COOKIE was sent. But there is
 135                  * a price to pay for COOKIE generation and I don't want to
 136                  * pay it on the chance that the app will actually do some
 137                  * accepts(). The App just looses and should NOT be in this
 138                  * state :-)
 139                  */
 140                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 141                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 142                             "No listener");
 143                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 144                             mflowtype, mflowid, inp->fibnum,
 145                             vrf_id, port);
 146                 }
 147                 goto outnow;
 148         }
 149         if ((stcb != NULL) &&
 150             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 151                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 152                 sctp_send_shutdown_ack(stcb, NULL);
 153                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 154         } else {
 155                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 156                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 157                     src, dst, sh, cp,
 158                     mflowtype, mflowid,
 159                     vrf_id, port);
 160         }
 161 outnow:
 162         if (stcb == NULL) {
 163                 SCTP_INP_RUNLOCK(inp);
 164         }
 165 }
 166
 167 /*
 168  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 169  */
 170
 171 int
 172 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked)
 173 {
 174         int unsent_data;
 175         unsigned int i;
 176         struct sctp_stream_queue_pending *sp;
 177         struct sctp_association *asoc;
 178
 179         SCTP_TCB_LOCK_ASSERT(stcb);
 180
 181         /*
 182          * This function returns if any stream has true unsent data on it.
 183          * Note that as it looks through it will clean up any places that
 184          * have old data that has been sent but left at top of stream queue.
 185          */
 186         asoc = &stcb->asoc;
 187         unsent_data = 0;
 188         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 189                 /* Check to see if some data queued */
 190                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 191                         /* sa_ignore FREED_MEMORY */
 192                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 193                         if (sp == NULL) {
 194                                 continue;
 195                         }
 196                         if ((sp->msg_is_complete) &&
 197                             (sp->length == 0) &&
 198                             (sp->sender_all_done)) {
 199                                 /*
 200                                  * We are doing differed cleanup. Last time
 201                                  * through when we took all the data the
 202                                  * sender_all_done was not set.
 203                                  */
 204                                 if (sp->put_last_out == 0) {
 205                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 206                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 207                                             sp->sender_all_done,
 208                                             sp->length,
 209                                             sp->msg_is_complete,
 210                                             sp->put_last_out);
 211                                 }
 212                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 213                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 214                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp);
 215                                 if (sp->net) {
 216                                         sctp_free_remote_addr(sp->net);
 217                                         sp->net = NULL;
 218                                 }
 219                                 if (sp->data) {
 220                                         sctp_m_freem(sp->data);
 221                                         sp->data = NULL;
 222                                 }
 223                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 224                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 225                                         unsent_data++;
 226                                 }
 227                         } else {
 228                                 unsent_data++;
 229                         }
 230                         if (unsent_data > 0) {
 231                                 break;
 232                         }
 233                 }
 234         }
 235         return (unsent_data);
 236 }
 237
 238 static int
 239 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 240 {
 241         struct sctp_init *init;
 242         struct sctp_association *asoc;
 243         struct sctp_nets *lnet;
 244         unsigned int i;
 245
 246         SCTP_TCB_LOCK_ASSERT(stcb);
 247
 248         init = &cp->init;
 249         asoc = &stcb->asoc;
 250         /* save off parameters */
 251         asoc->peer_vtag = ntohl(init->initiate_tag);
 252         asoc->peers_rwnd = ntohl(init->a_rwnd);
 253         /* init tsn's */
 254         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 255
 256         if (!TAILQ_EMPTY(&asoc->nets)) {
 257                 /* update any ssthresh's that may have a default */
 258                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 259                         lnet->ssthresh = asoc->peers_rwnd;
 260                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 261                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 262                         }
 263                 }
 264         }
 265         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 266                 unsigned int newcnt;
 267                 struct sctp_stream_out *outs;
 268                 struct sctp_stream_queue_pending *sp, *nsp;
 269                 struct sctp_tmit_chunk *chk, *nchk;
 270
 271                 /* abandon the upper streams */
 272                 newcnt = ntohs(init->num_inbound_streams);
 273                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 274                         if (chk->rec.data.sid >= newcnt) {
 275                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 276                                 asoc->send_queue_cnt--;
 277                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 278                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 279 #ifdef INVARIANTS
 280                                 } else {
 281                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 282 #endif
 283                                 }
 284                                 if (chk->data != NULL) {
 285                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 286                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 287                                             0, chk, SCTP_SO_NOT_LOCKED);
 288                                         if (chk->data) {
 289                                                 sctp_m_freem(chk->data);
 290                                                 chk->data = NULL;
 291                                         }
 292                                 }
 293                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 294                                 /* sa_ignore FREED_MEMORY */
 295                         }
 296                 }
 297                 if (asoc->strmout) {
 298                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 299                                 outs = &asoc->strmout[i];
 300                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 301                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 302                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 303                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp);
 304                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 305                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 306                                         if (sp->data) {
 307                                                 sctp_m_freem(sp->data);
 308                                                 sp->data = NULL;
 309                                         }
 310                                         if (sp->net) {
 311                                                 sctp_free_remote_addr(sp->net);
 312                                                 sp->net = NULL;
 313                                         }
 314                                         /* Free the chunk */
 315                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 316                                         /* sa_ignore FREED_MEMORY */
 317                                 }
 318                                 outs->state = SCTP_STREAM_CLOSED;
 319                         }
 320                 }
 321                 /* cut back the count */
 322                 asoc->pre_open_streams = newcnt;
 323         }
 324         asoc->streamoutcnt = asoc->pre_open_streams;
 325         if (asoc->strmout) {
 326                 for (i = 0; i < asoc->streamoutcnt; i++) {
 327                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 328                 }
 329         }
 330         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 331         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 332         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 333                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 334         }
 335         /* This is the next one we expect */
 336         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 337
 338         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 339         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 340
 341         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 342         /* open the requested streams */
 343
 344         if (asoc->strmin != NULL) {
 345                 /* Free the old ones */
 346                 for (i = 0; i < asoc->streamincnt; i++) {
 347                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 348                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 349                 }
 350                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 351         }
 352         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 353                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 354         } else {
 355                 asoc->streamincnt = asoc->max_inbound_streams;
 356         }
 357         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 358             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 359         if (asoc->strmin == NULL) {
 360                 /* we didn't get memory for the streams! */
 361                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 362                 return (-1);
 363         }
 364         for (i = 0; i < asoc->streamincnt; i++) {
 365                 asoc->strmin[i].sid = i;
 366                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 367                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 368                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 369                 asoc->strmin[i].pd_api_started = 0;
 370                 asoc->strmin[i].delivery_started = 0;
 371         }
 372         /*
 373          * load_address_from_init will put the addresses into the
 374          * association when the COOKIE is processed or the INIT-ACK is
 375          * processed. Both types of COOKIE's existing and new call this
 376          * routine. It will remove addresses that are no longer in the
 377          * association (for the restarting case where addresses are
 378          * removed). Up front when the INIT arrives we will discard it if it
 379          * is a restart and new addresses have been added.
 380          */
 381         /* sa_ignore MEMLEAK */
 382         return (0);
 383 }
 384
 385 /*
 386  * INIT-ACK message processing/consumption returns value < 0 on error
 387  */
 388 static int
 389 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 390     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 391     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 392     struct sctp_nets *net, int *abort_no_unlock,
 393     uint8_t mflowtype, uint32_t mflowid,
 394     uint32_t vrf_id)
 395 {
 396         struct sctp_association *asoc;
 397         struct mbuf *op_err;
 398         int retval, abort_flag, cookie_found;
 399         int initack_limit;
 400         int nat_friendly = 0;
 401
 402         /* First verify that we have no illegal param's */
 403         abort_flag = 0;
 404         cookie_found = 0;
 405
 406         op_err = sctp_arethere_unrecognized_parameters(m,
 407             (offset + sizeof(struct sctp_init_chunk)),
 408             &abort_flag, (struct sctp_chunkhdr *)cp,
 409             &nat_friendly, &cookie_found);
 410         if (abort_flag) {
 411                 /* Send an abort and notify peer */
 412                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 413                     src, dst, sh, op_err,
 414                     mflowtype, mflowid,
 415                     vrf_id, net->port);
 416                 *abort_no_unlock = 1;
 417                 return (-1);
 418         }
 419         if (!cookie_found) {
 420                 uint16_t len;
 421
 422                 /* Only report the missing cookie parameter */
 423                 if (op_err != NULL) {
 424                         sctp_m_freem(op_err);
 425                 }
 426                 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 427                 /* We abort with an error of missing mandatory param */
 428                 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 429                 if (op_err != NULL) {
 430                         struct sctp_error_missing_param *cause;
 431
 432                         SCTP_BUF_LEN(op_err) = len;
 433                         cause = mtod(op_err, struct sctp_error_missing_param *);
 434                         /* Subtract the reserved param */
 435                         cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 436                         cause->cause.length = htons(len);
 437                         cause->num_missing_params = htonl(1);
 438                         cause->type[0] = htons(SCTP_STATE_COOKIE);
 439                 }
 440                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 441                     src, dst, sh, op_err,
 442                     mflowtype, mflowid,
 443                     vrf_id, net->port);
 444                 *abort_no_unlock = 1;
 445                 return (-3);
 446         }
 447         asoc = &stcb->asoc;
 448         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 449         /* process the peer's parameters in the INIT-ACK */
 450         if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) {
 451                 if (op_err != NULL) {
 452                         sctp_m_freem(op_err);
 453                 }
 454                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
 455                 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
 456                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 457                     src, dst, sh, op_err,
 458                     mflowtype, mflowid,
 459                     vrf_id, net->port);
 460                 *abort_no_unlock = 1;
 461                 return (-1);
 462         }
 463         initack_limit = offset + ntohs(cp->ch.chunk_length);
 464         /* load all addresses */
 465         if ((retval = sctp_load_addresses_from_init(stcb, m,
 466             offset + sizeof(struct sctp_init_chunk),
 467             initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) {
 468                 if (op_err != NULL) {
 469                         sctp_m_freem(op_err);
 470                 }
 471                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 472                     "Problem with address parameters");
 473                 SCTPDBG(SCTP_DEBUG_INPUT1,
 474                     "Load addresses from INIT causes an abort %d\n",
 475                     retval);
 476                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 477                     src, dst, sh, op_err,
 478                     mflowtype, mflowid,
 479                     vrf_id, net->port);
 480                 *abort_no_unlock = 1;
 481                 return (-1);
 482         }
 483         /* if the peer doesn't support asconf, flush the asconf queue */
 484         if (asoc->asconf_supported == 0) {
 485                 struct sctp_asconf_addr *param, *nparam;
 486
 487                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 488                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 489                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 490                 }
 491         }
 492
 493         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 494             stcb->asoc.local_hmacs);
 495         if (op_err) {
 496                 sctp_queue_op_err(stcb, op_err);
 497                 /* queuing will steal away the mbuf chain to the out queue */
 498                 op_err = NULL;
 499         }
 500         /* extract the cookie and queue it to "echo" it back... */
 501         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 502                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 503                     stcb->asoc.overall_error_count,
 504                     0,
 505                     SCTP_FROM_SCTP_INPUT,
 506                     __LINE__);
 507         }
 508
 509         /*
 510          * Cancel the INIT timer, We do this first before queueing the
 511          * cookie. We always cancel at the primary to assume that we are
 512          * canceling the timer started by the INIT which always goes to the
 513          * primary.
 514          */
 515         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 516             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 517
 518         /* calculate the RTO */
 519         if (asoc->overall_error_count == 0) {
 520                 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 521                     SCTP_RTT_FROM_NON_DATA);
 522         }
 523         stcb->asoc.overall_error_count = 0;
 524         net->error_count = 0;
 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) == 0) {
 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                 atomic_add_int(&stcb->asoc.refcnt, 1);
 685                 SCTP_TCB_UNLOCK(stcb);
 686                 SCTP_INP_INFO_WLOCK();
 687                 SCTP_TCB_LOCK(stcb);
 688                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 689         } else {
 690                 return (0);
 691         }
 692         new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 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, true, false, 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_check_data_from_peer(struct sctp_tcb *stcb, int *abort_flag)
 834 {
 835         char msg[SCTP_DIAG_INFO_LEN];
 836         struct sctp_association *asoc;
 837         struct mbuf *op_err;
 838         unsigned int i;
 839
 840         *abort_flag = 0;
 841         asoc = &stcb->asoc;
 842         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn) ||
 843             SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
 844                 SCTP_SNPRINTF(msg, sizeof(msg), "Missing TSN");
 845                 *abort_flag = 1;
 846         }
 847         if (!*abort_flag) {
 848                 for (i = 0; i < asoc->streamincnt; i++) {
 849                         if (!TAILQ_EMPTY(&asoc->strmin[i].inqueue) ||
 850                             !TAILQ_EMPTY(&asoc->strmin[i].uno_inqueue)) {
 851                                 SCTP_SNPRINTF(msg, sizeof(msg), "Missing user data");
 852                                 *abort_flag = 1;
 853                                 break;
 854                         }
 855                 }
 856         }
 857         if (*abort_flag) {
 858                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
 859                 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INPUT + SCTP_LOC_9;
 860                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
 861         }
 862 }
 863
 864 static void
 865 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 866     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 867 {
 868         int some_on_streamwheel;
 869         int old_state;
 870
 871         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_shutdown: handling SHUTDOWN\n");
 872         if (stcb == NULL)
 873                 return;
 874         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 875             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 876                 return;
 877         }
 878         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 879                 /* Shutdown NOT the expected size */
 880                 return;
 881         }
 882         old_state = SCTP_GET_STATE(stcb);
 883         sctp_update_acked(stcb, cp, abort_flag);
 884         if (*abort_flag) {
 885                 return;
 886         }
 887         sctp_check_data_from_peer(stcb, abort_flag);
 888         if (*abort_flag) {
 889                 return;
 890         }
 891         if (stcb->sctp_socket) {
 892                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 893                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 894                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
 895                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
 896                         /*
 897                          * notify upper layer that peer has initiated a
 898                          * shutdown
 899                          */
 900                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 901
 902                         /* reset time */
 903                         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 904                 }
 905         }
 906         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
 907                 /*
 908                  * stop the shutdown timer, since we WILL move to
 909                  * SHUTDOWN-ACK-SENT.
 910                  */
 911                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 912                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 913         }
 914         /* Now is there unsent data on a stream somewhere? */
 915         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 916
 917         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
 918             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
 919             some_on_streamwheel) {
 920                 /* By returning we will push more data out */
 921                 return;
 922         } else {
 923                 /* no outstanding data to send, so move on... */
 924                 /* send SHUTDOWN-ACK */
 925                 /* move to SHUTDOWN-ACK-SENT state */
 926                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 927                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 928                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 929                 }
 930                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 931                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
 932                         sctp_stop_timers_for_shutdown(stcb);
 933                         sctp_send_shutdown_ack(stcb, net);
 934                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 935                             stcb->sctp_ep, stcb, net);
 936                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 937                         sctp_send_shutdown_ack(stcb, net);
 938                 }
 939         }
 940 }
 941
 942 static void
 943 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 944     struct sctp_tcb *stcb,
 945     struct sctp_nets *net)
 946 {
 947         int abort_flag;
 948
 949         SCTPDBG(SCTP_DEBUG_INPUT2,
 950             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 951         if (stcb == NULL) {
 952                 return;
 953         }
 954
 955         /* process according to association state */
 956         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 957             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 958                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 959                 sctp_send_shutdown_complete(stcb, net, 1);
 960                 SCTP_TCB_UNLOCK(stcb);
 961                 return;
 962         }
 963         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
 964             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 965                 /* unexpected SHUTDOWN-ACK... so ignore... */
 966                 SCTP_TCB_UNLOCK(stcb);
 967                 return;
 968         }
 969         sctp_check_data_from_peer(stcb, &abort_flag);
 970         if (abort_flag) {
 971                 return;
 972         }
 973 #ifdef INVARIANTS
 974         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
 975             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
 976             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
 977                 panic("Queues are not empty when handling SHUTDOWN-ACK");
 978         }
 979 #endif
 980         /* stop the timer */
 981         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
 982             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
 983         /* send SHUTDOWN-COMPLETE */
 984         sctp_send_shutdown_complete(stcb, net, 0);
 985         /* notify upper layer protocol */
 986         if (stcb->sctp_socket) {
 987                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 988                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 989                         SCTP_SB_CLEAR(stcb->sctp_socket->so_snd);
 990                 }
 991                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 992         }
 993         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
 994         /* free the TCB but first save off the ep */
 995         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 996             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
 997 }
 998
 999 static void
1000 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
1001 {
1002         switch (chunk_type) {
1003         case SCTP_ASCONF_ACK:
1004         case SCTP_ASCONF:
1005                 sctp_asconf_cleanup(stcb);
1006                 break;
1007         case SCTP_IFORWARD_CUM_TSN:
1008         case SCTP_FORWARD_CUM_TSN:
1009                 stcb->asoc.prsctp_supported = 0;
1010                 break;
1011         default:
1012                 SCTPDBG(SCTP_DEBUG_INPUT2,
1013                     "Peer does not support chunk type %d (0x%x).\n",
1014                     chunk_type, chunk_type);
1015                 break;
1016         }
1017 }
1018
1019 /*
1020  * Skip past the param header and then we will find the param that caused the
1021  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1022  * these will turn of specific features.
1023  * XXX: Is this the right thing to do?
1024  */
1025 static void
1026 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1027 {
1028         switch (parameter_type) {
1029                 /* pr-sctp draft */
1030         case SCTP_PRSCTP_SUPPORTED:
1031                 stcb->asoc.prsctp_supported = 0;
1032                 break;
1033         case SCTP_SUPPORTED_CHUNK_EXT:
1034                 break;
1035                 /* draft-ietf-tsvwg-addip-sctp */
1036         case SCTP_HAS_NAT_SUPPORT:
1037                 stcb->asoc.peer_supports_nat = 0;
1038                 break;
1039         case SCTP_ADD_IP_ADDRESS:
1040         case SCTP_DEL_IP_ADDRESS:
1041         case SCTP_SET_PRIM_ADDR:
1042                 stcb->asoc.asconf_supported = 0;
1043                 break;
1044         case SCTP_SUCCESS_REPORT:
1045         case SCTP_ERROR_CAUSE_IND:
1046                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1047                 SCTPDBG(SCTP_DEBUG_INPUT2,
1048                     "Turning off ASCONF to this strange peer\n");
1049                 stcb->asoc.asconf_supported = 0;
1050                 break;
1051         default:
1052                 SCTPDBG(SCTP_DEBUG_INPUT2,
1053                     "Peer does not support param type %d (0x%x)??\n",
1054                     parameter_type, parameter_type);
1055                 break;
1056         }
1057 }
1058
1059 static int
1060 sctp_handle_error(struct sctp_chunkhdr *ch,
1061     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1062 {
1063         struct sctp_error_cause *cause;
1064         struct sctp_association *asoc;
1065         uint32_t remaining_length, adjust;
1066         uint16_t code, cause_code, cause_length;
1067
1068         /* parse through all of the errors and process */
1069         asoc = &stcb->asoc;
1070         cause = (struct sctp_error_cause *)((caddr_t)ch +
1071             sizeof(struct sctp_chunkhdr));
1072         remaining_length = ntohs(ch->chunk_length);
1073         if (remaining_length > limit) {
1074                 remaining_length = limit;
1075         }
1076         if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1077                 remaining_length -= sizeof(struct sctp_chunkhdr);
1078         } else {
1079                 remaining_length = 0;
1080         }
1081         code = 0;
1082         while (remaining_length >= sizeof(struct sctp_error_cause)) {
1083                 /* Process an Error Cause */
1084                 cause_code = ntohs(cause->code);
1085                 cause_length = ntohs(cause->length);
1086                 if ((cause_length > remaining_length) || (cause_length == 0)) {
1087                         /* Invalid cause length, possibly due to truncation. */
1088                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1089                             remaining_length, cause_length);
1090                         return (0);
1091                 }
1092                 if (code == 0) {
1093                         /* report the first error cause */
1094                         code = cause_code;
1095                 }
1096                 switch (cause_code) {
1097                 case SCTP_CAUSE_INVALID_STREAM:
1098                 case SCTP_CAUSE_MISSING_PARAM:
1099                 case SCTP_CAUSE_INVALID_PARAM:
1100                 case SCTP_CAUSE_NO_USER_DATA:
1101                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1102                             cause_code);
1103                         break;
1104                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1105                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n",
1106                             ch->chunk_flags);
1107                         if (sctp_handle_nat_colliding_state(stcb)) {
1108                                 return (0);
1109                         }
1110                         break;
1111                 case SCTP_CAUSE_NAT_MISSING_STATE:
1112                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n",
1113                             ch->chunk_flags);
1114                         if (sctp_handle_nat_missing_state(stcb, net)) {
1115                                 return (0);
1116                         }
1117                         break;
1118                 case SCTP_CAUSE_STALE_COOKIE:
1119                         /*
1120                          * We only act if we have echoed a cookie and are
1121                          * waiting.
1122                          */
1123                         if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1124                             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1125                                 struct timeval now;
1126                                 struct sctp_error_stale_cookie *stale_cookie;
1127                                 uint64_t stale_time;
1128
1129                                 asoc->stale_cookie_count++;
1130                                 if (asoc->stale_cookie_count > asoc->max_init_times) {
1131                                         sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED);
1132                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1133                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1134                                         return (-1);
1135                                 }
1136                                 stale_cookie = (struct sctp_error_stale_cookie *)cause;
1137                                 stale_time = ntohl(stale_cookie->stale_time);
1138                                 if (stale_time == 0) {
1139                                         /* Use an RTT as an approximation. */
1140                                         (void)SCTP_GETTIME_TIMEVAL(&now);
1141                                         timevalsub(&now, &asoc->time_entered);
1142                                         stale_time = (uint64_t)1000000 * (uint64_t)now.tv_sec + (uint64_t)now.tv_usec;
1143                                         if (stale_time == 0) {
1144                                                 stale_time = 1;
1145                                         }
1146                                 }
1147                                 /*
1148                                  * stale_time is in usec, convert it to
1149                                  * msec. Round upwards, to ensure that it is
1150                                  * non-zero.
1151                                  */
1152                                 stale_time = (stale_time + 999) / 1000;
1153                                 /* Double it, to be more robust on RTX. */
1154                                 stale_time = 2 * stale_time;
1155                                 asoc->cookie_preserve_req = (uint32_t)stale_time;
1156                                 if (asoc->overall_error_count == 0) {
1157                                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
1158                                             SCTP_RTT_FROM_NON_DATA);
1159                                 }
1160                                 asoc->overall_error_count = 0;
1161                                 /* Blast back to INIT state */
1162                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1163                                 sctp_stop_all_cookie_timers(stcb);
1164                                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1165                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
1166                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1167                         }
1168                         break;
1169                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1170                         /*
1171                          * Nothing we can do here, we don't do hostname
1172                          * addresses so if the peer does not like my IPv6
1173                          * (or IPv4 for that matter) it does not matter. If
1174                          * they don't support that type of address, they can
1175                          * NOT possibly get that packet type... i.e. with no
1176                          * IPv6 you can't receive a IPv6 packet. so we can
1177                          * safely ignore this one. If we ever added support
1178                          * for HOSTNAME Addresses, then we would need to do
1179                          * something here.
1180                          */
1181                         break;
1182                 case SCTP_CAUSE_UNRECOG_CHUNK:
1183                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1184                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
1185
1186                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1187                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
1188                         }
1189                         break;
1190                 case SCTP_CAUSE_UNRECOG_PARAM:
1191                         /* XXX: We only consider the first parameter */
1192                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1193                                 struct sctp_paramhdr *unrec_parameter;
1194
1195                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1196                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1197                         }
1198                         break;
1199                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1200                         /*
1201                          * We ignore this since the timer will drive out a
1202                          * new cookie anyway and there timer will drive us
1203                          * to send a SHUTDOWN_COMPLETE. We can't send one
1204                          * here since we don't have their tag.
1205                          */
1206                         break;
1207                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1208                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1209                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1210                         /*
1211                          * We should NOT get these here, but in a
1212                          * ASCONF-ACK.
1213                          */
1214                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1215                             cause_code);
1216                         break;
1217                 case SCTP_CAUSE_OUT_OF_RESC:
1218                         /*
1219                          * And what, pray tell do we do with the fact that
1220                          * the peer is out of resources? Not really sure we
1221                          * could do anything but abort. I suspect this
1222                          * should have came WITH an abort instead of in a
1223                          * OP-ERROR.
1224                          */
1225                         break;
1226                 default:
1227                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1228                             cause_code);
1229                         break;
1230                 }
1231                 adjust = SCTP_SIZE32(cause_length);
1232                 if (remaining_length >= adjust) {
1233                         remaining_length -= adjust;
1234                 } else {
1235                         remaining_length = 0;
1236                 }
1237                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1238         }
1239         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1240         return (0);
1241 }
1242
1243 static int
1244 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1245     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1246     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1247     struct sctp_nets *net, int *abort_no_unlock,
1248     uint8_t mflowtype, uint32_t mflowid,
1249     uint32_t vrf_id)
1250 {
1251         struct sctp_init_ack *init_ack;
1252         struct mbuf *op_err;
1253
1254         SCTPDBG(SCTP_DEBUG_INPUT2,
1255             "sctp_handle_init_ack: handling INIT-ACK\n");
1256
1257         if (stcb == NULL) {
1258                 SCTPDBG(SCTP_DEBUG_INPUT2,
1259                     "sctp_handle_init_ack: TCB is null\n");
1260                 return (-1);
1261         }
1262         /* Only process the INIT-ACK chunk in COOKIE WAIT state. */
1263         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
1264                 init_ack = &cp->init;
1265                 /* Validate parameters. */
1266                 if ((ntohl(init_ack->initiate_tag) == 0) ||
1267                     (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) ||
1268                     (ntohs(init_ack->num_inbound_streams) == 0) ||
1269                     (ntohs(init_ack->num_outbound_streams) == 0)) {
1270                         /* One of the mandatory parameters is illegal. */
1271                         op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1272                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1273                             src, dst, sh, op_err,
1274                             mflowtype, mflowid,
1275                             vrf_id, net->port);
1276                         *abort_no_unlock = 1;
1277                         return (-1);
1278                 }
1279                 if (stcb->asoc.primary_destination->dest_state &
1280                     SCTP_ADDR_UNCONFIRMED) {
1281                         /*
1282                          * The primary is where we sent the INIT, we can
1283                          * always consider it confirmed when the INIT-ACK is
1284                          * returned. Do this before we load addresses
1285                          * though.
1286                          */
1287                         stcb->asoc.primary_destination->dest_state &=
1288                             ~SCTP_ADDR_UNCONFIRMED;
1289                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1290                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1291                 }
1292                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1293                     net, abort_no_unlock,
1294                     mflowtype, mflowid,
1295                     vrf_id) < 0) {
1296                         /* error in parsing parameters */
1297                         return (-1);
1298                 }
1299                 /* Update our state. */
1300                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1301                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1302
1303                 /* Reset the RTO calculation. */
1304                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1305                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1306                             stcb->asoc.overall_error_count,
1307                             0,
1308                             SCTP_FROM_SCTP_INPUT,
1309                             __LINE__);
1310                 }
1311                 stcb->asoc.overall_error_count = 0;
1312                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1313                 /*
1314                  * Collapse the init timer back in case of a exponential
1315                  * backoff.
1316                  */
1317                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1318                     stcb, net);
1319                 /*
1320                  * The output routine at the end of the inbound data
1321                  * processing will cause the cookie to be sent.
1322                  */
1323                 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1324                 return (0);
1325         } else {
1326                 return (-1);
1327         }
1328 }
1329
1330 static struct sctp_tcb *
1331 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1332     struct sockaddr *src, struct sockaddr *dst,
1333     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1334     struct sctp_inpcb *inp, struct sctp_nets **netp,
1335     struct sockaddr *init_src, int *notification,
1336     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1337     uint8_t mflowtype, uint32_t mflowid,
1338     uint32_t vrf_id, uint16_t port);
1339
1340 /*
1341  * handle a state cookie for an existing association m: input packet mbuf
1342  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1343  * "split" mbuf and the cookie signature does not exist offset: offset into
1344  * mbuf to the cookie-echo chunk
1345  */
1346 static struct sctp_tcb *
1347 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1348     struct sockaddr *src, struct sockaddr *dst,
1349     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1350     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1351     struct sockaddr *init_src, int *notification,
1352     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1353     uint8_t mflowtype, uint32_t mflowid,
1354     uint32_t vrf_id, uint16_t port)
1355 {
1356         struct sctp_association *asoc;
1357         struct sctp_init_chunk *init_cp, init_buf;
1358         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1359         struct sctp_asconf_addr *aparam, *naparam;
1360         struct sctp_asconf_ack *aack, *naack;
1361         struct sctp_tmit_chunk *chk, *nchk;
1362         struct sctp_stream_reset_list *strrst, *nstrrst;
1363         struct sctp_queued_to_read *sq, *nsq;
1364         struct sctp_nets *net;
1365         struct mbuf *op_err;
1366         int init_offset, initack_offset, i;
1367         int retval;
1368         int spec_flag = 0;
1369         uint32_t how_indx;
1370 #if defined(SCTP_DETAILED_STR_STATS)
1371         int j;
1372 #endif
1373
1374         net = *netp;
1375         /* I know that the TCB is non-NULL from the caller */
1376         asoc = &stcb->asoc;
1377         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1378                 if (asoc->cookie_how[how_indx] == 0)
1379                         break;
1380         }
1381         if (how_indx < sizeof(asoc->cookie_how)) {
1382                 asoc->cookie_how[how_indx] = 1;
1383         }
1384         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1385                 /* SHUTDOWN came in after sending INIT-ACK */
1386                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1387                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1388                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1389                     mflowtype, mflowid, inp->fibnum,
1390                     vrf_id, net->port);
1391                 if (how_indx < sizeof(asoc->cookie_how))
1392                         asoc->cookie_how[how_indx] = 2;
1393                 SCTP_TCB_UNLOCK(stcb);
1394                 return (NULL);
1395         }
1396         /*
1397          * find and validate the INIT chunk in the cookie (peer's info) the
1398          * INIT should start after the cookie-echo header struct (chunk
1399          * header, state cookie header struct)
1400          */
1401         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1402
1403         init_cp = (struct sctp_init_chunk *)
1404             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1405             (uint8_t *)&init_buf);
1406         if (init_cp == NULL) {
1407                 /* could not pull a INIT chunk in cookie */
1408                 SCTP_TCB_UNLOCK(stcb);
1409                 return (NULL);
1410         }
1411         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1412                 SCTP_TCB_UNLOCK(stcb);
1413                 return (NULL);
1414         }
1415         /*
1416          * find and validate the INIT-ACK chunk in the cookie (my info) the
1417          * INIT-ACK follows the INIT chunk
1418          */
1419         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1420         initack_cp = (struct sctp_init_ack_chunk *)
1421             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1422             (uint8_t *)&initack_buf);
1423         if (initack_cp == NULL) {
1424                 /* could not pull INIT-ACK chunk in cookie */
1425                 SCTP_TCB_UNLOCK(stcb);
1426                 return (NULL);
1427         }
1428         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1429                 SCTP_TCB_UNLOCK(stcb);
1430                 return (NULL);
1431         }
1432         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1433             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1434                 /*
1435                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1436                  * to get into the OPEN state
1437                  */
1438                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1439                         /*-
1440                          * Opps, this means that we somehow generated two vtag's
1441                          * the same. I.e. we did:
1442                          *  Us               Peer
1443                          *   <---INIT(tag=a)------
1444                          *   ----INIT-ACK(tag=t)-->
1445                          *   ----INIT(tag=t)------> *1
1446                          *   <---INIT-ACK(tag=a)---
1447                          *   <----CE(tag=t)------------- *2
1448                          *
1449                          * At point *1 we should be generating a different
1450                          * tag t'. Which means we would throw away the CE and send
1451                          * ours instead. Basically this is case C (throw away side).
1452                          */
1453                         if (how_indx < sizeof(asoc->cookie_how))
1454                                 asoc->cookie_how[how_indx] = 17;
1455                         SCTP_TCB_UNLOCK(stcb);
1456                         return (NULL);
1457                 }
1458                 switch (SCTP_GET_STATE(stcb)) {
1459                 case SCTP_STATE_COOKIE_WAIT:
1460                 case SCTP_STATE_COOKIE_ECHOED:
1461                         /*
1462                          * INIT was sent but got a COOKIE_ECHO with the
1463                          * correct tags... just accept it...but we must
1464                          * process the init so that we can make sure we have
1465                          * the right seq no's.
1466                          */
1467                         /* First we must process the INIT !! */
1468                         if (sctp_process_init(init_cp, stcb) < 0) {
1469                                 if (how_indx < sizeof(asoc->cookie_how))
1470                                         asoc->cookie_how[how_indx] = 3;
1471                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1472                                 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1473                                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1474                                     src, dst, sh, op_err,
1475                                     mflowtype, mflowid,
1476                                     vrf_id, net->port);
1477                                 return (NULL);
1478                         }
1479                         /* we have already processed the INIT so no problem */
1480                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1481                             stcb, net,
1482                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1483                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1484                             stcb, net,
1485                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1486                         /* update current state */
1487                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1488                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1489                         else
1490                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1491
1492                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1493                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1494                         sctp_stop_all_cookie_timers(stcb);
1495                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1496                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1497                             (!SCTP_IS_LISTENING(inp))) {
1498                                 /*
1499                                  * Here is where collision would go if we
1500                                  * did a connect() and instead got a
1501                                  * init/init-ack/cookie done before the
1502                                  * init-ack came back..
1503                                  */
1504                                 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
1505                                 soisconnected(stcb->sctp_socket);
1506                         }
1507                         /* notify upper layer */
1508                         *notification = SCTP_NOTIFY_ASSOC_UP;
1509                         net->hb_responded = 1;
1510                         if (stcb->asoc.sctp_autoclose_ticks &&
1511                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1512                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1513                                     inp, stcb, NULL);
1514                         }
1515                         break;
1516                 default:
1517                         /*
1518                          * we're in the OPEN state (or beyond), so peer must
1519                          * have simply lost the COOKIE-ACK
1520                          */
1521                         break;
1522                 }               /* end switch */
1523                 sctp_stop_all_cookie_timers(stcb);
1524                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1525                     init_offset + sizeof(struct sctp_init_chunk),
1526                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1527                         if (how_indx < sizeof(asoc->cookie_how))
1528                                 asoc->cookie_how[how_indx] = 4;
1529                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1530                             "Problem with address parameters");
1531                         SCTPDBG(SCTP_DEBUG_INPUT1,
1532                             "Load addresses from INIT causes an abort %d\n",
1533                             retval);
1534                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1535                             src, dst, sh, op_err,
1536                             mflowtype, mflowid,
1537                             vrf_id, net->port);
1538                         return (NULL);
1539                 }
1540                 /* respond with a COOKIE-ACK */
1541                 sctp_toss_old_cookies(stcb, asoc);
1542                 sctp_send_cookie_ack(stcb);
1543                 if (how_indx < sizeof(asoc->cookie_how))
1544                         asoc->cookie_how[how_indx] = 5;
1545                 return (stcb);
1546         }
1547
1548         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1549             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1550             cookie->tie_tag_my_vtag == 0 &&
1551             cookie->tie_tag_peer_vtag == 0) {
1552                 /*
1553                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1554                  */
1555                 if (how_indx < sizeof(asoc->cookie_how))
1556                         asoc->cookie_how[how_indx] = 6;
1557                 SCTP_TCB_UNLOCK(stcb);
1558                 return (NULL);
1559         }
1560         /*
1561          * If nat support, and the below and stcb is established, send back
1562          * a ABORT(colliding state) if we are established.
1563          */
1564         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1565             (asoc->peer_supports_nat) &&
1566             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1567             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1568             (asoc->peer_vtag == 0)))) {
1569                 /*
1570                  * Special case - Peer's support nat. We may have two init's
1571                  * that we gave out the same tag on since one was not
1572                  * established.. i.e. we get INIT from host-1 behind the nat
1573                  * and we respond tag-a, we get a INIT from host-2 behind
1574                  * the nat and we get tag-a again. Then we bring up host-1
1575                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1576                  * Now we have colliding state. We must send an abort here
1577                  * with colliding state indication.
1578                  */
1579                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1580                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1581                     mflowtype, mflowid, inp->fibnum,
1582                     vrf_id, port);
1583                 SCTP_TCB_UNLOCK(stcb);
1584                 return (NULL);
1585         }
1586         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1587             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1588             (asoc->peer_vtag == 0))) {
1589                 /*
1590                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1591                  * should be ok, re-accept peer info
1592                  */
1593                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1594                         /*
1595                          * Extension of case C. If we hit this, then the
1596                          * random number generator returned the same vtag
1597                          * when we first sent our INIT-ACK and when we later
1598                          * sent our INIT. The side with the seq numbers that
1599                          * are different will be the one that normally would
1600                          * have hit case C. This in effect "extends" our
1601                          * vtags in this collision case to be 64 bits. The
1602                          * same collision could occur aka you get both vtag
1603                          * and seq number the same twice in a row.. but is
1604                          * much less likely. If it did happen then we would
1605                          * proceed through and bring up the assoc.. we may
1606                          * end up with the wrong stream setup however..
1607                          * which would be bad.. but there is no way to
1608                          * tell.. until we send on a stream that does not
1609                          * exist :-)
1610                          */
1611                         if (how_indx < sizeof(asoc->cookie_how))
1612                                 asoc->cookie_how[how_indx] = 7;
1613
1614                         SCTP_TCB_UNLOCK(stcb);
1615                         return (NULL);
1616                 }
1617                 if (how_indx < sizeof(asoc->cookie_how))
1618                         asoc->cookie_how[how_indx] = 8;
1619                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1620                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1621                 sctp_stop_all_cookie_timers(stcb);
1622                 /*
1623                  * since we did not send a HB make sure we don't double
1624                  * things
1625                  */
1626                 net->hb_responded = 1;
1627                 if (stcb->asoc.sctp_autoclose_ticks &&
1628                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1629                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1630                             NULL);
1631                 }
1632                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1633                 if (asoc->pre_open_streams < asoc->streamoutcnt) {
1634                         asoc->pre_open_streams = asoc->streamoutcnt;
1635                 }
1636
1637                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1638                         /*
1639                          * Ok the peer probably discarded our data (if we
1640                          * echoed a cookie+data). So anything on the
1641                          * sent_queue should be marked for retransmit, we
1642                          * may not get something to kick us so it COULD
1643                          * still take a timeout to move these.. but it can't
1644                          * hurt to mark them.
1645                          */
1646
1647                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1648                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1649                                         chk->sent = SCTP_DATAGRAM_RESEND;
1650                                         sctp_flight_size_decrease(chk);
1651                                         sctp_total_flight_decrease(stcb, chk);
1652                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1653                                         spec_flag++;
1654                                 }
1655                         }
1656                 }
1657                 /* process the INIT info (peer's info) */
1658                 if (sctp_process_init(init_cp, stcb) < 0) {
1659                         if (how_indx < sizeof(asoc->cookie_how))
1660                                 asoc->cookie_how[how_indx] = 9;
1661                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1662                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1663                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1664                             src, dst, sh, op_err,
1665                             mflowtype, mflowid,
1666                             vrf_id, net->port);
1667                         return (NULL);
1668                 }
1669                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1670                     init_offset + sizeof(struct sctp_init_chunk),
1671                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1672                         if (how_indx < sizeof(asoc->cookie_how))
1673                                 asoc->cookie_how[how_indx] = 10;
1674                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1675                             "Problem with address parameters");
1676                         SCTPDBG(SCTP_DEBUG_INPUT1,
1677                             "Load addresses from INIT causes an abort %d\n",
1678                             retval);
1679                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1680                             src, dst, sh, op_err,
1681                             mflowtype, mflowid,
1682                             vrf_id, net->port);
1683                         return (NULL);
1684                 }
1685                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1686                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1687                         *notification = SCTP_NOTIFY_ASSOC_UP;
1688
1689                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1690                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1691                             (!SCTP_IS_LISTENING(inp))) {
1692                                 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
1693                                 soisconnected(stcb->sctp_socket);
1694                         }
1695                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1696                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1697                         else
1698                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1699                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1700                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1701                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1702                 } else {
1703                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1704                 }
1705                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1706                 sctp_stop_all_cookie_timers(stcb);
1707                 sctp_toss_old_cookies(stcb, asoc);
1708                 sctp_send_cookie_ack(stcb);
1709                 if (spec_flag) {
1710                         /*
1711                          * only if we have retrans set do we do this. What
1712                          * this call does is get only the COOKIE-ACK out and
1713                          * then when we return the normal call to
1714                          * sctp_chunk_output will get the retrans out behind
1715                          * this.
1716                          */
1717                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1718                 }
1719                 if (how_indx < sizeof(asoc->cookie_how))
1720                         asoc->cookie_how[how_indx] = 11;
1721
1722                 return (stcb);
1723         }
1724         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1725             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1726             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1727             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1728             cookie->tie_tag_peer_vtag != 0) {
1729                 struct sctpasochead *head;
1730
1731                 if (asoc->peer_supports_nat) {
1732                         struct sctp_tcb *local_stcb;
1733
1734                         /*
1735                          * This is a gross gross hack. Just call the
1736                          * cookie_new code since we are allowing a duplicate
1737                          * association. I hope this works...
1738                          */
1739                         local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst,
1740                             sh, cookie, cookie_len,
1741                             inp, netp, init_src, notification,
1742                             auth_skipped, auth_offset, auth_len,
1743                             mflowtype, mflowid,
1744                             vrf_id, port);
1745                         if (local_stcb == NULL) {
1746                                 SCTP_TCB_UNLOCK(stcb);
1747                         }
1748                         return (local_stcb);
1749                 }
1750                 /*
1751                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1752                  */
1753                 /* temp code */
1754                 if (how_indx < sizeof(asoc->cookie_how))
1755                         asoc->cookie_how[how_indx] = 12;
1756                 sctp_stop_association_timers(stcb, false);
1757                 /* notify upper layer */
1758                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1759                 atomic_add_int(&stcb->asoc.refcnt, 1);
1760                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1761                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1762                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1763                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1764                 }
1765                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1766                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1767                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1768                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1769                 }
1770                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1771                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1772
1773                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1774                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1775                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1776                 }
1777                 if (asoc->pre_open_streams < asoc->streamoutcnt) {
1778                         asoc->pre_open_streams = asoc->streamoutcnt;
1779                 }
1780                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1781                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1782                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1783                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1784                 asoc->str_reset_seq_in = asoc->init_seq_number;
1785                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1786                 asoc->send_sack = 1;
1787                 asoc->data_pkts_seen = 0;
1788                 asoc->last_data_chunk_from = NULL;
1789                 asoc->last_control_chunk_from = NULL;
1790                 asoc->last_net_cmt_send_started = NULL;
1791                 if (asoc->mapping_array) {
1792                         memset(asoc->mapping_array, 0,
1793                             asoc->mapping_array_size);
1794                 }
1795                 if (asoc->nr_mapping_array) {
1796                         memset(asoc->nr_mapping_array, 0,
1797                             asoc->mapping_array_size);
1798                 }
1799                 SCTP_TCB_UNLOCK(stcb);
1800                 SCTP_INP_INFO_WLOCK();
1801                 SCTP_INP_WLOCK(stcb->sctp_ep);
1802                 SCTP_TCB_LOCK(stcb);
1803                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1804                 /* send up all the data */
1805                 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
1806                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1807                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1808 #if defined(SCTP_DETAILED_STR_STATS)
1809                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1810                                 asoc->strmout[i].abandoned_sent[j] = 0;
1811                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1812                         }
1813 #else
1814                         asoc->strmout[i].abandoned_sent[0] = 0;
1815                         asoc->strmout[i].abandoned_unsent[0] = 0;
1816 #endif
1817                         stcb->asoc.strmout[i].next_mid_ordered = 0;
1818                         stcb->asoc.strmout[i].next_mid_unordered = 0;
1819                         stcb->asoc.strmout[i].sid = i;
1820                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1821                 }
1822                 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) {
1823                         TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp);
1824                         SCTP_FREE(strrst, SCTP_M_STRESET);
1825                 }
1826                 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) {
1827                         TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next);
1828                         if (sq->data) {
1829                                 sctp_m_freem(sq->data);
1830                                 sq->data = NULL;
1831                         }
1832                         sctp_free_remote_addr(sq->whoFrom);
1833                         sq->whoFrom = NULL;
1834                         sq->stcb = NULL;
1835                         sctp_free_a_readq(stcb, sq);
1836                 }
1837                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
1838                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
1839                         if (chk->data) {
1840                                 sctp_m_freem(chk->data);
1841                                 chk->data = NULL;
1842                         }
1843                         if (chk->holds_key_ref)
1844                                 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1845                         sctp_free_remote_addr(chk->whoTo);
1846                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1847                         SCTP_DECR_CHK_COUNT();
1848                 }
1849                 asoc->ctrl_queue_cnt = 0;
1850                 asoc->str_reset = NULL;
1851                 asoc->stream_reset_outstanding = 0;
1852                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
1853                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
1854                         if (chk->data) {
1855                                 sctp_m_freem(chk->data);
1856                                 chk->data = NULL;
1857                         }
1858                         if (chk->holds_key_ref)
1859                                 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1860                         sctp_free_remote_addr(chk->whoTo);
1861                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1862                         SCTP_DECR_CHK_COUNT();
1863                 }
1864                 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) {
1865                         TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
1866                         SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
1867                 }
1868                 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) {
1869                         TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next);
1870                         if (aack->data != NULL) {
1871                                 sctp_m_freem(aack->data);
1872                         }
1873                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack);
1874                 }
1875                 asoc->rcv_edmid = cookie->rcv_edmid;
1876
1877                 /* process the INIT-ACK info (my info) */
1878                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1879                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1880
1881                 /* pull from vtag hash */
1882                 LIST_REMOVE(stcb, sctp_asocs);
1883                 /* re-insert to new vtag position */
1884                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1885                     SCTP_BASE_INFO(hashasocmark))];
1886                 /*
1887                  * put it in the bucket in the vtag hash of assoc's for the
1888                  * system
1889                  */
1890                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1891
1892                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1893                 SCTP_INP_INFO_WUNLOCK();
1894                 asoc->total_flight = 0;
1895                 asoc->total_flight_count = 0;
1896                 /* process the INIT info (peer's info) */
1897                 if (sctp_process_init(init_cp, stcb) < 0) {
1898                         if (how_indx < sizeof(asoc->cookie_how))
1899                                 asoc->cookie_how[how_indx] = 13;
1900                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1901                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1902                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1903                             src, dst, sh, op_err,
1904                             mflowtype, mflowid,
1905                             vrf_id, net->port);
1906                         return (NULL);
1907                 }
1908                 /*
1909                  * since we did not send a HB make sure we don't double
1910                  * things
1911                  */
1912                 net->hb_responded = 1;
1913
1914                 if ((retval = sctp_load_addresses_from_init(stcb, m,
1915                     init_offset + sizeof(struct sctp_init_chunk),
1916                     initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1917                         if (how_indx < sizeof(asoc->cookie_how))
1918                                 asoc->cookie_how[how_indx] = 14;
1919                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1920                             "Problem with address parameters");
1921                         SCTPDBG(SCTP_DEBUG_INPUT1,
1922                             "Load addresses from INIT causes an abort %d\n",
1923                             retval);
1924                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1925                             src, dst, sh, op_err,
1926                             mflowtype, mflowid,
1927                             vrf_id, net->port);
1928                         return (NULL);
1929                 }
1930                 /* respond with a COOKIE-ACK */
1931                 sctp_send_cookie_ack(stcb);
1932                 if (how_indx < sizeof(asoc->cookie_how))
1933                         asoc->cookie_how[how_indx] = 15;
1934                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) &&
1935                     (asoc->sctp_autoclose_ticks > 0)) {
1936                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
1937                 }
1938                 return (stcb);
1939         }
1940         if (how_indx < sizeof(asoc->cookie_how))
1941                 asoc->cookie_how[how_indx] = 16;
1942         /* all other cases... */
1943         SCTP_TCB_UNLOCK(stcb);
1944         return (NULL);
1945 }
1946
1947 /*
1948  * handle a state cookie for a new association m: input packet mbuf chain--
1949  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1950  * and the cookie signature does not exist offset: offset into mbuf to the
1951  * cookie-echo chunk length: length of the cookie chunk to: where the init
1952  * was from returns a new TCB
1953  */
1954 static struct sctp_tcb *
1955 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1956     struct sockaddr *src, struct sockaddr *dst,
1957     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1958     struct sctp_inpcb *inp, struct sctp_nets **netp,
1959     struct sockaddr *init_src, int *notification,
1960     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1961     uint8_t mflowtype, uint32_t mflowid,
1962     uint32_t vrf_id, uint16_t port)
1963 {
1964         struct sctp_tcb *stcb;
1965         struct sctp_init_chunk *init_cp, init_buf;
1966         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1967         union sctp_sockstore store;
1968         struct sctp_association *asoc;
1969         int init_offset, initack_offset, initack_limit;
1970         int error = 0;
1971         uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
1972
1973         /*
1974          * find and validate the INIT chunk in the cookie (peer's info) the
1975          * INIT should start after the cookie-echo header struct (chunk
1976          * header, state cookie header struct)
1977          */
1978         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1979         init_cp = (struct sctp_init_chunk *)
1980             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1981             (uint8_t *)&init_buf);
1982         if (init_cp == NULL) {
1983                 /* could not pull a INIT chunk in cookie */
1984                 SCTPDBG(SCTP_DEBUG_INPUT1,
1985                     "process_cookie_new: could not pull INIT chunk hdr\n");
1986                 return (NULL);
1987         }
1988         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1989                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
1990                 return (NULL);
1991         }
1992         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1993         /*
1994          * find and validate the INIT-ACK chunk in the cookie (my info) the
1995          * INIT-ACK follows the INIT chunk
1996          */
1997         initack_cp = (struct sctp_init_ack_chunk *)
1998             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1999             (uint8_t *)&initack_buf);
2000         if (initack_cp == NULL) {
2001                 /* could not pull INIT-ACK chunk in cookie */
2002                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2003                 return (NULL);
2004         }
2005         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2006                 return (NULL);
2007         }
2008         /*
2009          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2010          * "initack_limit" value.  This is because the chk_length field
2011          * includes the length of the cookie, but the cookie is omitted when
2012          * the INIT and INIT_ACK are tacked onto the cookie...
2013          */
2014         initack_limit = offset + cookie_len;
2015
2016         /*
2017          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2018          * and populate
2019          */
2020
2021         /*
2022          * Here we do a trick, we set in NULL for the proc/thread argument.
2023          * We do this since in effect we only use the p argument when the
2024          * socket is unbound and we must do an implicit bind. Since we are
2025          * getting a cookie, we cannot be unbound.
2026          */
2027         stcb = sctp_aloc_assoc(inp, init_src, &error,
2028             ntohl(initack_cp->init.initiate_tag),
2029             ntohl(initack_cp->init.initial_tsn), vrf_id,
2030             ntohs(initack_cp->init.num_outbound_streams),
2031             port,
2032             (struct thread *)NULL,
2033             SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2034         if (stcb == NULL) {
2035                 struct mbuf *op_err;
2036
2037                 /* memory problem? */
2038                 SCTPDBG(SCTP_DEBUG_INPUT1,
2039                     "process_cookie_new: no room for another TCB!\n");
2040                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2041                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2042                     src, dst, sh, op_err,
2043                     mflowtype, mflowid,
2044                     vrf_id, port);
2045                 return (NULL);
2046         }
2047         asoc = &stcb->asoc;
2048         /* get scope variables out of cookie */
2049         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2050         asoc->scope.site_scope = cookie->site_scope;
2051         asoc->scope.local_scope = cookie->local_scope;
2052         asoc->scope.loopback_scope = cookie->loopback_scope;
2053
2054         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2055             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2056                 struct mbuf *op_err;
2057
2058                 /*
2059                  * Houston we have a problem. The EP changed while the
2060                  * cookie was in flight. Only recourse is to abort the
2061                  * association.
2062                  */
2063                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2064                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2065                     src, dst, sh, op_err,
2066                     mflowtype, mflowid,
2067                     vrf_id, port);
2068                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2069                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2070                 return (NULL);
2071         }
2072         asoc->rcv_edmid = cookie->rcv_edmid;
2073         /* process the INIT-ACK info (my info) */
2074         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2075
2076         /* process the INIT info (peer's info) */
2077         if (sctp_process_init(init_cp, stcb) < 0) {
2078                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2079                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2080                 return (NULL);
2081         }
2082         /* load all addresses */
2083         if (sctp_load_addresses_from_init(stcb, m,
2084             init_offset + sizeof(struct sctp_init_chunk),
2085             initack_offset, src, dst, init_src, port) < 0) {
2086                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2087                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2088                 return (NULL);
2089         }
2090         /*
2091          * verify any preceding AUTH chunk that was skipped
2092          */
2093         /* pull the local authentication parameters from the cookie/init-ack */
2094         sctp_auth_get_cookie_params(stcb, m,
2095             initack_offset + sizeof(struct sctp_init_ack_chunk),
2096             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2097         if (auth_skipped) {
2098                 struct sctp_auth_chunk *auth;
2099
2100                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
2101                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2102                 } else {
2103                         auth = NULL;
2104                 }
2105                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2106                         /* auth HMAC failed, dump the assoc and packet */
2107                         SCTPDBG(SCTP_DEBUG_AUTH1,
2108                             "COOKIE-ECHO: AUTH failed\n");
2109                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2110                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2111                         return (NULL);
2112                 } else {
2113                         /* remaining chunks checked... good to go */
2114                         stcb->asoc.authenticated = 1;
2115                 }
2116         }
2117
2118         /*
2119          * if we're doing ASCONFs, check to see if we have any new local
2120          * addresses that need to get added to the peer (eg. addresses
2121          * changed while cookie echo in flight).  This needs to be done
2122          * after we go to the OPEN state to do the correct asconf
2123          * processing. else, make sure we have the correct addresses in our
2124          * lists
2125          */
2126
2127         /* warning, we re-use sin, sin6, sa_store here! */
2128         /* pull in local_address (our "from" address) */
2129         switch (cookie->laddr_type) {
2130 #ifdef INET
2131         case SCTP_IPV4_ADDRESS:
2132                 /* source addr is IPv4 */
2133                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2134                 store.sin.sin_family = AF_INET;
2135                 store.sin.sin_len = sizeof(struct sockaddr_in);
2136                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2137                 break;
2138 #endif
2139 #ifdef INET6
2140         case SCTP_IPV6_ADDRESS:
2141                 /* source addr is IPv6 */
2142                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2143                 store.sin6.sin6_family = AF_INET6;
2144                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2145                 store.sin6.sin6_scope_id = cookie->scope_id;
2146                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2147                 break;
2148 #endif
2149         default:
2150                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2151                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2152                 return (NULL);
2153         }
2154
2155         /* update current state */
2156         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2157         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2158         sctp_stop_all_cookie_timers(stcb);
2159         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2160         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2161
2162         /* set up to notify upper layer */
2163         *notification = SCTP_NOTIFY_ASSOC_UP;
2164         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2165             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2166             (!SCTP_IS_LISTENING(inp))) {
2167                 /*
2168                  * This is an endpoint that called connect() how it got a
2169                  * cookie that is NEW is a bit of a mystery. It must be that
2170                  * the INIT was sent, but before it got there.. a complete
2171                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2172                  * should have went to the other code.. not here.. oh well..
2173                  * a bit of protection is worth having..
2174                  *
2175                  * XXXMJ unlocked
2176                  */
2177                 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
2178                 soisconnected(stcb->sctp_socket);
2179         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2180             (SCTP_IS_LISTENING(inp))) {
2181                 /*
2182                  * We don't want to do anything with this one. Since it is
2183                  * the listening guy. The timer will get started for
2184                  * accepted connections in the caller.
2185                  */
2186                 ;
2187         }
2188         if (stcb->asoc.sctp_autoclose_ticks &&
2189             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2190                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2191         }
2192         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2193         *netp = sctp_findnet(stcb, init_src);
2194         if (*netp != NULL) {
2195                 /*
2196                  * Since we did not send a HB, make sure we don't double
2197                  * things.
2198                  */
2199                 (*netp)->hb_responded = 1;
2200         }
2201         /* respond with a COOKIE-ACK */
2202         sctp_send_cookie_ack(stcb);
2203
2204         /*
2205          * check the address lists for any ASCONFs that need to be sent
2206          * AFTER the cookie-ack is sent
2207          */
2208         sctp_check_address_list(stcb, m,
2209             initack_offset + sizeof(struct sctp_init_ack_chunk),
2210             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2211             &store.sa, cookie->local_scope, cookie->site_scope,
2212             cookie->ipv4_scope, cookie->loopback_scope);
2213
2214         return (stcb);
2215 }
2216
2217 /*
2218  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2219  * we NEED to make sure we are not already using the vtag. If so we
2220  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2221         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2222                                                             SCTP_BASE_INFO(hashasocmark))];
2223         LIST_FOREACH(stcb, head, sctp_asocs) {
2224                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) {
2225                        -- SEND ABORT - TRY AGAIN --
2226                 }
2227         }
2228 */
2229
2230 /*
2231  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2232  * existing (non-NULL) TCB
2233  */
2234 static struct mbuf *
2235 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2236     struct sockaddr *src, struct sockaddr *dst,
2237     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2238     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2239     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2240     struct sctp_tcb **locked_tcb,
2241     uint8_t mflowtype, uint32_t mflowid,
2242     uint32_t vrf_id, uint16_t port)
2243 {
2244         struct sctp_state_cookie *cookie;
2245         struct sctp_tcb *l_stcb = *stcb;
2246         struct sctp_inpcb *l_inp;
2247         struct sockaddr *to;
2248         struct sctp_pcb *ep;
2249         struct mbuf *m_sig;
2250         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2251         uint8_t *sig;
2252         uint8_t cookie_ok = 0;
2253         unsigned int sig_offset, cookie_offset;
2254         unsigned int cookie_len;
2255         struct timeval now;
2256         struct timeval time_entered, time_expires;
2257         int notification = 0;
2258         struct sctp_nets *netl;
2259         int had_a_existing_tcb = 0;
2260         int send_int_conf = 0;
2261 #ifdef INET
2262         struct sockaddr_in sin;
2263 #endif
2264 #ifdef INET6
2265         struct sockaddr_in6 sin6;
2266 #endif
2267
2268         SCTPDBG(SCTP_DEBUG_INPUT2,
2269             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2270
2271         if (inp_p == NULL) {
2272                 return (NULL);
2273         }
2274         cookie = &cp->cookie;
2275         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2276         cookie_len = ntohs(cp->ch.chunk_length);
2277
2278         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2279             sizeof(struct sctp_init_chunk) +
2280             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2281                 /* cookie too small */
2282                 return (NULL);
2283         }
2284         if ((cookie->peerport != sh->src_port) ||
2285             (cookie->myport != sh->dest_port) ||
2286             (cookie->my_vtag != sh->v_tag)) {
2287                 /*
2288                  * invalid ports or bad tag.  Note that we always leave the
2289                  * v_tag in the header in network order and when we stored
2290                  * it in the my_vtag slot we also left it in network order.
2291                  * This maintains the match even though it may be in the
2292                  * opposite byte order of the machine :->
2293                  */
2294                 return (NULL);
2295         }
2296         /*
2297          * split off the signature into its own mbuf (since it should not be
2298          * calculated in the sctp_hmac_m() call).
2299          */
2300         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2301         m_sig = m_split(m, sig_offset, M_NOWAIT);
2302         if (m_sig == NULL) {
2303                 /* out of memory or ?? */
2304                 return (NULL);
2305         }
2306 #ifdef SCTP_MBUF_LOGGING
2307         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2308                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2309         }
2310 #endif
2311
2312         /*
2313          * compute the signature/digest for the cookie
2314          */
2315         if (l_stcb != NULL) {
2316                 atomic_add_int(&l_stcb->asoc.refcnt, 1);
2317                 SCTP_TCB_UNLOCK(l_stcb);
2318         }
2319         l_inp = *inp_p;
2320         SCTP_INP_RLOCK(l_inp);
2321         if (l_stcb != NULL) {
2322                 SCTP_TCB_LOCK(l_stcb);
2323                 atomic_subtract_int(&l_stcb->asoc.refcnt, 1);
2324         }
2325         if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
2326                 SCTP_INP_RUNLOCK(l_inp);
2327                 sctp_m_freem(m_sig);
2328                 return (NULL);
2329         }
2330         ep = &(*inp_p)->sctp_ep;
2331         /* which cookie is it? */
2332         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2333             (ep->current_secret_number != ep->last_secret_number)) {
2334                 /* it's the old cookie */
2335                 (void)sctp_hmac_m(SCTP_HMAC,
2336                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2337                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2338         } else {
2339                 /* it's the current cookie */
2340                 (void)sctp_hmac_m(SCTP_HMAC,
2341                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2342                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2343         }
2344         /* get the signature */
2345         SCTP_INP_RUNLOCK(l_inp);
2346         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2347         if (sig == NULL) {
2348                 /* couldn't find signature */
2349                 sctp_m_freem(m_sig);
2350                 return (NULL);
2351         }
2352         /* compare the received digest with the computed digest */
2353         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2354                 /* try the old cookie? */
2355                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2356                     (ep->current_secret_number != ep->last_secret_number)) {
2357                         /* compute digest with old */
2358                         (void)sctp_hmac_m(SCTP_HMAC,
2359                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2360                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2361                         /* compare */
2362                         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2363                                 cookie_ok = 1;
2364                 }
2365         } else {
2366                 cookie_ok = 1;
2367         }
2368
2369         /*
2370          * Now before we continue we must reconstruct our mbuf so that
2371          * normal processing of any other chunks will work.
2372          */
2373         {
2374                 struct mbuf *m_at;
2375
2376                 m_at = m;
2377                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2378                         m_at = SCTP_BUF_NEXT(m_at);
2379                 }
2380                 SCTP_BUF_NEXT(m_at) = m_sig;
2381         }
2382
2383         if (cookie_ok == 0) {
2384                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2385                 SCTPDBG(SCTP_DEBUG_INPUT2,
2386                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2387                     (uint32_t)offset, cookie_offset, sig_offset);
2388                 return (NULL);
2389         }
2390
2391         if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) {
2392                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n");
2393                 return (NULL);
2394         }
2395         time_entered.tv_sec = cookie->time_entered.tv_sec;
2396         time_entered.tv_usec = cookie->time_entered.tv_usec;
2397         if ((time_entered.tv_sec < 0) ||
2398             (time_entered.tv_usec < 0) ||
2399             (time_entered.tv_usec >= 1000000)) {
2400                 /* Invalid time stamp. Cookie must have been modified. */
2401                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n");
2402                 return (NULL);
2403         }
2404         (void)SCTP_GETTIME_TIMEVAL(&now);
2405         if (timevalcmp(&now, &time_entered, <)) {
2406                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n");
2407                 return (NULL);
2408         }
2409         /*
2410          * Check the cookie timestamps to be sure it's not stale.
2411          * cookie_life is in ticks, so we convert to seconds.
2412          */
2413         time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
2414         time_expires.tv_usec = time_entered.tv_usec;
2415         if (timevalcmp(&now, &time_expires, >)) {
2416                 /* cookie is stale! */
2417                 struct mbuf *op_err;
2418                 struct sctp_error_stale_cookie *cause;
2419                 struct timeval diff;
2420                 uint32_t staleness;
2421
2422                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2423                     0, M_NOWAIT, 1, MT_DATA);
2424                 if (op_err == NULL) {
2425                         /* FOOBAR */
2426                         return (NULL);
2427                 }
2428                 /* Set the len */
2429                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2430                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2431                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2432                 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie));
2433                 diff = now;
2434                 timevalsub(&diff, &time_expires);
2435                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2436                         staleness = UINT32_MAX;
2437                 } else {
2438                         staleness = (uint32_t)diff.tv_sec * 1000000;
2439                 }
2440                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2441                         staleness += (uint32_t)diff.tv_usec;
2442                 } else {
2443                         staleness = UINT32_MAX;
2444                 }
2445                 cause->stale_time = htonl(staleness);
2446                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2447                     mflowtype, mflowid, l_inp->fibnum,
2448                     vrf_id, port);
2449                 return (NULL);
2450         }
2451         /*
2452          * Now we must see with the lookup address if we have an existing
2453          * asoc. This will only happen if we were in the COOKIE-WAIT state
2454          * and a INIT collided with us and somewhere the peer sent the
2455          * cookie on another address besides the single address our assoc
2456          * had for him. In this case we will have one of the tie-tags set at
2457          * least AND the address field in the cookie can be used to look it
2458          * up.
2459          */
2460         to = NULL;
2461         switch (cookie->addr_type) {
2462 #ifdef INET6
2463         case SCTP_IPV6_ADDRESS:
2464                 memset(&sin6, 0, sizeof(sin6));
2465                 sin6.sin6_family = AF_INET6;
2466                 sin6.sin6_len = sizeof(sin6);
2467                 sin6.sin6_port = sh->src_port;
2468                 sin6.sin6_scope_id = cookie->scope_id;
2469                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2470                     sizeof(sin6.sin6_addr.s6_addr));
2471                 to = (struct sockaddr *)&sin6;
2472                 break;
2473 #endif
2474 #ifdef INET
2475         case SCTP_IPV4_ADDRESS:
2476                 memset(&sin, 0, sizeof(sin));
2477                 sin.sin_family = AF_INET;
2478                 sin.sin_len = sizeof(sin);
2479                 sin.sin_port = sh->src_port;
2480                 sin.sin_addr.s_addr = cookie->address[0];
2481                 to = (struct sockaddr *)&sin;
2482                 break;
2483 #endif
2484         default:
2485                 /* This should not happen */
2486                 return (NULL);
2487         }
2488         if (*stcb == NULL) {
2489                 /* Yep, lets check */
2490                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2491                 if (*stcb == NULL) {
2492                         /*
2493                          * We should have only got back the same inp. If we
2494                          * got back a different ep we have a problem. The
2495                          * original findep got back l_inp and now
2496                          */
2497                         if (l_inp != *inp_p) {
2498                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2499                         }
2500                 } else {
2501                         if (*locked_tcb == NULL) {
2502                                 /*
2503                                  * In this case we found the assoc only
2504                                  * after we locked the create lock. This
2505                                  * means we are in a colliding case and we
2506                                  * must make sure that we unlock the tcb if
2507                                  * its one of the cases where we throw away
2508                                  * the incoming packets.
2509                                  */
2510                                 *locked_tcb = *stcb;
2511
2512                                 /*
2513                                  * We must also increment the inp ref count
2514                                  * since the ref_count flags was set when we
2515                                  * did not find the TCB, now we found it
2516                                  * which reduces the refcount.. we must
2517                                  * raise it back out to balance it all :-)
2518                                  */
2519                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2520                                 if ((*stcb)->sctp_ep != l_inp) {
2521                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2522                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2523                                 }
2524                         }
2525                 }
2526         }
2527
2528         cookie_len -= SCTP_SIGNATURE_SIZE;
2529         if (*stcb == NULL) {
2530                 /* this is the "normal" case... get a new TCB */
2531                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2532                     cookie, cookie_len, *inp_p,
2533                     netp, to, &notification,
2534                     auth_skipped, auth_offset, auth_len,
2535                     mflowtype, mflowid,
2536                     vrf_id, port);
2537         } else {
2538                 /* this is abnormal... cookie-echo on existing TCB */
2539                 had_a_existing_tcb = 1;
2540                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2541                     src, dst, sh,
2542                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2543                     &notification, auth_skipped, auth_offset, auth_len,
2544                     mflowtype, mflowid,
2545                     vrf_id, port);
2546                 if (*stcb == NULL) {
2547                         *locked_tcb = NULL;
2548                 }
2549         }
2550
2551         if (*stcb == NULL) {
2552                 /* still no TCB... must be bad cookie-echo */
2553                 return (NULL);
2554         }
2555         if (*netp != NULL) {
2556                 (*netp)->flowtype = mflowtype;
2557                 (*netp)->flowid = mflowid;
2558         }
2559         /*
2560          * Ok, we built an association so confirm the address we sent the
2561          * INIT-ACK to.
2562          */
2563         netl = sctp_findnet(*stcb, to);
2564         /*
2565          * This code should in theory NOT run but
2566          */
2567         if (netl == NULL) {
2568                 /* TSNH! Huh, why do I need to add this address here? */
2569                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2570                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2571                         return (NULL);
2572                 }
2573                 netl = sctp_findnet(*stcb, to);
2574         }
2575         if (netl) {
2576                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2577                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2578                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2579                             netl);
2580                         send_int_conf = 1;
2581                 }
2582         }
2583         sctp_start_net_timers(*stcb);
2584         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2585                 if (!had_a_existing_tcb ||
2586                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2587                         /*
2588                          * If we have a NEW cookie or the connect never
2589                          * reached the connected state during collision we
2590                          * must do the TCP accept thing.
2591                          */
2592                         struct socket *so, *oso;
2593                         struct sctp_inpcb *inp;
2594
2595                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2596                                 /*
2597                                  * For a restart we will keep the same
2598                                  * socket, no need to do anything. I THINK!!
2599                                  */
2600                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2601                                 if (send_int_conf) {
2602                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2603                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2604                                 }
2605                                 return (m);
2606                         }
2607                         oso = (*inp_p)->sctp_socket;
2608                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2609                         SCTP_TCB_UNLOCK((*stcb));
2610                         CURVNET_SET(oso->so_vnet);
2611                         so = sonewconn(oso, 0
2612                             );
2613                         CURVNET_RESTORE();
2614                         SCTP_TCB_LOCK((*stcb));
2615                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2616
2617                         if (so == NULL) {
2618                                 struct mbuf *op_err;
2619
2620                                 /* Too many sockets */
2621                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2622                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2623                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2624                                     src, dst, sh, op_err,
2625                                     mflowtype, mflowid,
2626                                     vrf_id, port);
2627                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2628                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2629                                 return (NULL);
2630                         }
2631                         inp = (struct sctp_inpcb *)so->so_pcb;
2632                         SCTP_INP_INCR_REF(inp);
2633                         /*
2634                          * We add the unbound flag here so that if we get an
2635                          * soabort() before we get the move_pcb done, we
2636                          * will properly cleanup.
2637                          */
2638                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2639                             SCTP_PCB_FLAGS_CONNECTED |
2640                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2641                             SCTP_PCB_FLAGS_UNBOUND |
2642                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2643                             SCTP_PCB_FLAGS_DONT_WAKE);
2644                         inp->sctp_features = (*inp_p)->sctp_features;
2645                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2646                         inp->sctp_socket = so;
2647                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2648                         inp->max_cwnd = (*inp_p)->max_cwnd;
2649                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2650                         inp->ecn_supported = (*inp_p)->ecn_supported;
2651                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2652                         inp->auth_supported = (*inp_p)->auth_supported;
2653                         inp->asconf_supported = (*inp_p)->asconf_supported;
2654                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2655                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2656                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2657                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2658                         inp->sctp_context = (*inp_p)->sctp_context;
2659                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2660                         inp->fibnum = (*inp_p)->fibnum;
2661                         /*
2662                          * copy in the authentication parameters from the
2663                          * original endpoint
2664                          */
2665                         if (inp->sctp_ep.local_hmacs)
2666                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2667                         inp->sctp_ep.local_hmacs =
2668                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2669                         if (inp->sctp_ep.local_auth_chunks)
2670                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2671                         inp->sctp_ep.local_auth_chunks =
2672                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2673
2674                         /*
2675                          * Now we must move it from one hash table to
2676                          * another and get the tcb in the right place.
2677                          */
2678
2679                         /*
2680                          * This is where the one-2-one socket is put into
2681                          * the accept state waiting for the accept!
2682                          */
2683                         if (*stcb) {
2684                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2685                         }
2686                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2687
2688                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2689                         SCTP_TCB_UNLOCK((*stcb));
2690
2691                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2692                             0);
2693                         SCTP_TCB_LOCK((*stcb));
2694                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2695
2696                         /*
2697                          * now we must check to see if we were aborted while
2698                          * the move was going on and the lock/unlock
2699                          * happened.
2700                          */
2701                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2702                                 /*
2703                                  * yep it was, we leave the assoc attached
2704                                  * to the socket since the sctp_inpcb_free()
2705                                  * call will send an abort for us.
2706                                  */
2707                                 SCTP_INP_DECR_REF(inp);
2708                                 return (NULL);
2709                         }
2710                         SCTP_INP_DECR_REF(inp);
2711                         /* Switch over to the new guy */
2712                         *inp_p = inp;
2713                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2714                         if (send_int_conf) {
2715                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2716                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2717                         }
2718
2719                         /*
2720                          * Pull it from the incomplete queue and wake the
2721                          * guy
2722                          */
2723                         soisconnected(so);
2724                         return (m);
2725                 }
2726         }
2727         if (notification) {
2728                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2729         }
2730         if (send_int_conf) {
2731                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2732                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2733         }
2734         return (m);
2735 }
2736
2737 static void
2738 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2739     struct sctp_tcb *stcb, struct sctp_nets *net)
2740 {
2741         /* cp must not be used, others call this without a c-ack :-) */
2742         struct sctp_association *asoc;
2743         struct sctp_tmit_chunk *chk;
2744
2745         SCTPDBG(SCTP_DEBUG_INPUT2,
2746             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2747         if ((stcb == NULL) || (net == NULL)) {
2748                 return;
2749         }
2750
2751         asoc = &stcb->asoc;
2752         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2753                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2754                     asoc->overall_error_count,
2755                     0,
2756                     SCTP_FROM_SCTP_INPUT,
2757                     __LINE__);
2758         }
2759         sctp_stop_all_cookie_timers(stcb);
2760         sctp_toss_old_cookies(stcb, asoc);
2761         /* process according to association state */
2762         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2763                 /* state change only needed when I am in right state */
2764                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2765                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2766                 sctp_start_net_timers(stcb);
2767                 /* update RTO */
2768                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2769                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2770                 if (asoc->overall_error_count == 0) {
2771                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2772                             SCTP_RTT_FROM_NON_DATA);
2773                 }
2774                 /*
2775                  * Since we did not send a HB make sure we don't double
2776                  * things.
2777                  */
2778                 asoc->overall_error_count = 0;
2779                 net->hb_responded = 1;
2780                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2781                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2782                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2783                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2784                         sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
2785                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2786                                 soisconnected(stcb->sctp_socket);
2787                         }
2788                 }
2789
2790                 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
2791                     TAILQ_EMPTY(&asoc->send_queue) &&
2792                     TAILQ_EMPTY(&asoc->sent_queue) &&
2793                     (asoc->stream_queue_cnt == 0)) {
2794                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
2795                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
2796                         sctp_stop_timers_for_shutdown(stcb);
2797                         sctp_send_shutdown(stcb, net);
2798                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
2799                             stcb->sctp_ep, stcb, net);
2800                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2801                             stcb->sctp_ep, stcb, NULL);
2802                         sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_LOCKED);
2803                 }
2804
2805                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2806                         /*
2807                          * We don't need to do the asconf thing, nor hb or
2808                          * autoclose if the socket is closed.
2809                          */
2810                         goto closed_socket;
2811                 }
2812
2813                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2814                     stcb, net);
2815
2816                 if (stcb->asoc.sctp_autoclose_ticks &&
2817                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2818                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2819                             stcb->sctp_ep, stcb, NULL);
2820                 }
2821                 /*
2822                  * send ASCONF if parameters are pending and ASCONFs are
2823                  * allowed (eg. addresses changed when init/cookie echo were
2824                  * in flight)
2825                  */
2826                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2827                     (stcb->asoc.asconf_supported == 1) &&
2828                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2829 #ifdef SCTP_TIMER_BASED_ASCONF
2830                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2831                             stcb->sctp_ep, stcb,
2832                             stcb->asoc.primary_destination);
2833 #else
2834                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2835                             SCTP_ADDR_NOT_LOCKED);
2836 #endif
2837                 }
2838         }
2839 closed_socket:
2840         /* Restart the timer if we have pending data */
2841         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
2842                 if (chk->whoTo != NULL) {
2843                         break;
2844                 }
2845         }
2846         if (chk != NULL) {
2847                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2848         }
2849 }
2850
2851 static void
2852 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2853     struct sctp_tcb *stcb)
2854 {
2855         struct sctp_nets *net;
2856         struct sctp_tmit_chunk *lchk;
2857         struct sctp_ecne_chunk bkup;
2858         uint8_t override_bit;
2859         uint32_t tsn, window_data_tsn;
2860         int len;
2861         unsigned int pkt_cnt;
2862
2863         len = ntohs(cp->ch.chunk_length);
2864         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2865                 /* Its the old format */
2866                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2867                 bkup.num_pkts_since_cwr = htonl(1);
2868                 cp = &bkup;
2869         }
2870         SCTP_STAT_INCR(sctps_recvecne);
2871         tsn = ntohl(cp->tsn);
2872         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2873         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2874         if (lchk == NULL) {
2875                 window_data_tsn = stcb->asoc.sending_seq - 1;
2876         } else {
2877                 window_data_tsn = lchk->rec.data.tsn;
2878         }
2879
2880         /* Find where it was sent to if possible. */
2881         net = NULL;
2882         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2883                 if (lchk->rec.data.tsn == tsn) {
2884                         net = lchk->whoTo;
2885                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2886                         break;
2887                 }
2888                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
2889                         break;
2890                 }
2891         }
2892         if (net == NULL) {
2893                 /*
2894                  * What to do. A previous send of a CWR was possibly lost.
2895                  * See how old it is, we may have it marked on the actual
2896                  * net.
2897                  */
2898                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2899                         if (tsn == net->last_cwr_tsn) {
2900                                 /* Found him, send it off */
2901                                 break;
2902                         }
2903                 }
2904                 if (net == NULL) {
2905                         /*
2906                          * If we reach here, we need to send a special CWR
2907                          * that says hey, we did this a long time ago and
2908                          * you lost the response.
2909                          */
2910                         net = TAILQ_FIRST(&stcb->asoc.nets);
2911                         if (net == NULL) {
2912                                 /* TSNH */
2913                                 return;
2914                         }
2915                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2916                 } else {
2917                         override_bit = 0;
2918                 }
2919         } else {
2920                 override_bit = 0;
2921         }
2922         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2923             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2924                 /*
2925                  * JRS - Use the congestion control given in the pluggable
2926                  * CC module
2927                  */
2928                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2929                 /*
2930                  * We reduce once every RTT. So we will only lower cwnd at
2931                  * the next sending seq i.e. the window_data_tsn
2932                  */
2933                 net->cwr_window_tsn = window_data_tsn;
2934                 net->ecn_ce_pkt_cnt += pkt_cnt;
2935                 net->lost_cnt = pkt_cnt;
2936                 net->last_cwr_tsn = tsn;
2937         } else {
2938                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
2939                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
2940                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2941                         /*
2942                          * Another loss in the same window update how many
2943                          * marks/packets lost we have had.
2944                          */
2945                         int cnt = 1;
2946
2947                         if (pkt_cnt > net->lost_cnt) {
2948                                 /* Should be the case */
2949                                 cnt = (pkt_cnt - net->lost_cnt);
2950                                 net->ecn_ce_pkt_cnt += cnt;
2951                         }
2952                         net->lost_cnt = pkt_cnt;
2953                         net->last_cwr_tsn = tsn;
2954                         /*
2955                          * Most CC functions will ignore this call, since we
2956                          * are in-window yet of the initial CE the peer saw.
2957                          */
2958                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
2959                 }
2960         }
2961         /*
2962          * We always send a CWR this way if our previous one was lost our
2963          * peer will get an update, or if it is not time again to reduce we
2964          * still get the cwr to the peer. Note we set the override when we
2965          * could not find the TSN on the chunk or the destination network.
2966          */
2967         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
2968 }
2969
2970 static void
2971 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
2972 {
2973         /*
2974          * Here we get a CWR from the peer. We must look in the outqueue and
2975          * make sure that we have a covered ECNE in the control chunk part.
2976          * If so remove it.
2977          */
2978         struct sctp_tmit_chunk *chk, *nchk;
2979         struct sctp_ecne_chunk *ecne;
2980         int override;
2981         uint32_t cwr_tsn;
2982
2983         cwr_tsn = ntohl(cp->tsn);
2984         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
2985         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
2986                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
2987                         continue;
2988                 }
2989                 if ((override == 0) && (chk->whoTo != net)) {
2990                         /* Must be from the right src unless override is set */
2991                         continue;
2992                 }
2993                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
2994                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
2995                         /* this covers this ECNE, we can remove it */
2996                         stcb->asoc.ecn_echo_cnt_onq--;
2997                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
2998                             sctp_next);
2999                         stcb->asoc.ctrl_queue_cnt--;
3000                         sctp_m_freem(chk->data);
3001                         chk->data = NULL;
3002                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3003                         if (override == 0) {
3004                                 break;
3005                         }
3006                 }
3007         }
3008 }
3009
3010 static void
3011 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3012     struct sctp_tcb *stcb, struct sctp_nets *net)
3013 {
3014
3015         SCTPDBG(SCTP_DEBUG_INPUT2,
3016             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3017         if (stcb == NULL)
3018                 return;
3019
3020         /* process according to association state */
3021         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3022                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3023                 SCTPDBG(SCTP_DEBUG_INPUT2,
3024                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3025                 SCTP_TCB_UNLOCK(stcb);
3026                 return;
3027         }
3028         /* notify upper layer protocol */
3029         if (stcb->sctp_socket) {
3030                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3031         }
3032 #ifdef INVARIANTS
3033         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3034             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3035             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3036                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3037         }
3038 #endif
3039         /* stop the timer */
3040         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3041             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3042         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3043         /* free the TCB */
3044         SCTPDBG(SCTP_DEBUG_INPUT2,
3045             "sctp_handle_shutdown_complete: calls free-asoc\n");
3046         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3047             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3048         return;
3049 }
3050
3051 static int
3052 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3053     struct sctp_nets *net, uint8_t flg)
3054 {
3055         switch (desc->chunk_type) {
3056         case SCTP_DATA:
3057         case SCTP_IDATA:
3058                 /* find the tsn to resend (possibly) */
3059                 {
3060                         uint32_t tsn;
3061                         struct sctp_tmit_chunk *tp1;
3062
3063                         tsn = ntohl(desc->tsn_ifany);
3064                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3065                                 if (tp1->rec.data.tsn == tsn) {
3066                                         /* found it */
3067                                         break;
3068                                 }
3069                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3070                                         /* not found */
3071                                         tp1 = NULL;
3072                                         break;
3073                                 }
3074                         }
3075                         if (tp1 == NULL) {
3076                                 /*
3077                                  * Do it the other way , aka without paying
3078                                  * attention to queue seq order.
3079                                  */
3080                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3081                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3082                                         if (tp1->rec.data.tsn == tsn) {
3083                                                 /* found it */
3084                                                 break;
3085                                         }
3086                                 }
3087                         }
3088                         if (tp1 == NULL) {
3089                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3090                         }
3091                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3092                                 if (((flg & SCTP_BADCRC) == 0) &&
3093                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3094                                         return (0);
3095                                 }
3096                                 if ((stcb->asoc.peers_rwnd == 0) &&
3097                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3098                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3099                                         return (0);
3100                                 }
3101                                 if (stcb->asoc.peers_rwnd == 0 &&
3102                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3103                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3104                                         return (0);
3105                                 }
3106                                 if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
3107                                     SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
3108                                         /* Payload not matching. */
3109                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3110                                         return (-1);
3111                                 }
3112                                 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb),
3113                                     desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
3114                                         /* Payload not matching. */
3115                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3116                                         return (-1);
3117                                 }
3118                                 if (tp1->do_rtt) {
3119                                         /*
3120                                          * this guy had a RTO calculation
3121                                          * pending on it, cancel it
3122                                          */
3123                                         if (tp1->whoTo->rto_needed == 0) {
3124                                                 tp1->whoTo->rto_needed = 1;
3125                                         }
3126                                         tp1->do_rtt = 0;
3127                                 }
3128                                 SCTP_STAT_INCR(sctps_pdrpmark);
3129                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3130                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3131                                 /*
3132                                  * mark it as if we were doing a FR, since
3133                                  * we will be getting gap ack reports behind
3134                                  * the info from the router.
3135                                  */
3136                                 tp1->rec.data.doing_fast_retransmit = 1;
3137                                 /*
3138                                  * mark the tsn with what sequences can
3139                                  * cause a new FR.
3140                                  */
3141                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3142                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3143                                 } else {
3144                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3145                                 }
3146
3147                                 /* restart the timer */
3148                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3149                                     stcb, tp1->whoTo,
3150                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3151                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3152                                     stcb, tp1->whoTo);
3153
3154                                 /* fix counts and things */
3155                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3156                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3157                                             tp1->whoTo->flight_size,
3158                                             tp1->book_size,
3159                                             (uint32_t)(uintptr_t)stcb,
3160                                             tp1->rec.data.tsn);
3161                                 }
3162                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3163                                         sctp_flight_size_decrease(tp1);
3164                                         sctp_total_flight_decrease(stcb, tp1);
3165                                 }
3166                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3167                         } {
3168                                 /* audit code */
3169                                 unsigned int audit;
3170
3171                                 audit = 0;
3172                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3173                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3174                                                 audit++;
3175                                 }
3176                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3177                                     sctp_next) {
3178                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3179                                                 audit++;
3180                                 }
3181                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3182                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3183                                             audit, stcb->asoc.sent_queue_retran_cnt);
3184 #ifndef SCTP_AUDITING_ENABLED
3185                                         stcb->asoc.sent_queue_retran_cnt = audit;
3186 #endif
3187                                 }
3188                         }
3189                 }
3190                 break;
3191         case SCTP_ASCONF:
3192                 {
3193                         struct sctp_tmit_chunk *asconf;
3194
3195                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3196                             sctp_next) {
3197                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3198                                         break;
3199                                 }
3200                         }
3201                         if (asconf) {
3202                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3203                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3204                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3205                                 asconf->snd_count--;
3206                         }
3207                 }
3208                 break;
3209         case SCTP_INITIATION:
3210                 /* resend the INIT */
3211                 stcb->asoc.dropped_special_cnt++;
3212                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3213                         /*
3214                          * If we can get it in, in a few attempts we do
3215                          * this, otherwise we let the timer fire.
3216                          */
3217                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3218                             stcb, net,
3219                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3220                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3221                 }
3222                 break;
3223         case SCTP_SELECTIVE_ACK:
3224         case SCTP_NR_SELECTIVE_ACK:
3225                 /* resend the sack */
3226                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3227                 break;
3228         case SCTP_HEARTBEAT_REQUEST:
3229                 /* resend a demand HB */
3230                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3231                         /*
3232                          * Only retransmit if we KNOW we wont destroy the
3233                          * tcb
3234                          */
3235                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3236                 }
3237                 break;
3238         case SCTP_SHUTDOWN:
3239                 sctp_send_shutdown(stcb, net);
3240                 break;
3241         case SCTP_SHUTDOWN_ACK:
3242                 sctp_send_shutdown_ack(stcb, net);
3243                 break;
3244         case SCTP_COOKIE_ECHO:
3245                 {
3246                         struct sctp_tmit_chunk *cookie;
3247
3248                         cookie = NULL;
3249                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3250                             sctp_next) {
3251                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3252                                         break;
3253                                 }
3254                         }
3255                         if (cookie) {
3256                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3257                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3258                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3259                                 sctp_stop_all_cookie_timers(stcb);
3260                         }
3261                 }
3262                 break;
3263         case SCTP_COOKIE_ACK:
3264                 sctp_send_cookie_ack(stcb);
3265                 break;
3266         case SCTP_ASCONF_ACK:
3267                 /* resend last asconf ack */
3268                 sctp_send_asconf_ack(stcb);
3269                 break;
3270         case SCTP_IFORWARD_CUM_TSN:
3271         case SCTP_FORWARD_CUM_TSN:
3272                 send_forward_tsn(stcb, &stcb->asoc);
3273                 break;
3274                 /* can't do anything with these */
3275         case SCTP_PACKET_DROPPED:
3276         case SCTP_INITIATION_ACK:       /* this should not happen */
3277         case SCTP_HEARTBEAT_ACK:
3278         case SCTP_ABORT_ASSOCIATION:
3279         case SCTP_OPERATION_ERROR:
3280         case SCTP_SHUTDOWN_COMPLETE:
3281         case SCTP_ECN_ECHO:
3282         case SCTP_ECN_CWR:
3283         default:
3284                 break;
3285         }
3286         return (0);
3287 }
3288
3289 void
3290 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3291 {
3292         uint32_t i;
3293         uint16_t temp;
3294
3295         /*
3296          * We set things to 0xffffffff since this is the last delivered
3297          * sequence and we will be sending in 0 after the reset.
3298          */
3299
3300         if (number_entries) {
3301                 for (i = 0; i < number_entries; i++) {
3302                         temp = ntohs(list[i]);
3303                         if (temp >= stcb->asoc.streamincnt) {
3304                                 continue;
3305                         }
3306                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3307                 }
3308         } else {
3309                 list = NULL;
3310                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3311                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3312                 }
3313         }
3314         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3315 }
3316
3317 static void
3318 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3319 {
3320         uint32_t i;
3321         uint16_t temp;
3322
3323         if (number_entries > 0) {
3324                 for (i = 0; i < number_entries; i++) {
3325                         temp = ntohs(list[i]);
3326                         if (temp >= stcb->asoc.streamoutcnt) {
3327                                 /* no such stream */
3328                                 continue;
3329                         }
3330                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3331                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3332                 }
3333         } else {
3334                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3335                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3336                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3337                 }
3338         }
3339         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3340 }
3341
3342 static void
3343 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3344 {
3345         uint32_t i;
3346         uint16_t temp;
3347
3348         if (number_entries > 0) {
3349                 for (i = 0; i < number_entries; i++) {
3350                         temp = ntohs(list[i]);
3351                         if (temp >= stcb->asoc.streamoutcnt) {
3352                                 /* no such stream */
3353                                 continue;
3354                         }
3355                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3356                 }
3357         } else {
3358                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3359                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3360                 }
3361         }
3362 }
3363
3364 struct sctp_stream_reset_request *
3365 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3366 {
3367         struct sctp_association *asoc;
3368         struct sctp_chunkhdr *ch;
3369         struct sctp_stream_reset_request *r;
3370         struct sctp_tmit_chunk *chk;
3371         int len, clen;
3372
3373         asoc = &stcb->asoc;
3374         chk = asoc->str_reset;
3375         if (TAILQ_EMPTY(&asoc->control_send_queue) ||
3376             (chk == NULL)) {
3377                 asoc->stream_reset_outstanding = 0;
3378                 return (NULL);
3379         }
3380         if (chk->data == NULL) {
3381                 return (NULL);
3382         }
3383         if (bchk != NULL) {
3384                 /* he wants a copy of the chk pointer */
3385                 *bchk = chk;
3386         }
3387         clen = chk->send_size;
3388         ch = mtod(chk->data, struct sctp_chunkhdr *);
3389         r = (struct sctp_stream_reset_request *)(ch + 1);
3390         if (ntohl(r->request_seq) == seq) {
3391                 /* found it */
3392                 return (r);
3393         }
3394         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3395         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3396                 /* move to the next one, there can only be a max of two */
3397                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3398                 if (ntohl(r->request_seq) == seq) {
3399                         return (r);
3400                 }
3401         }
3402         /* that seq is not here */
3403         return (NULL);
3404 }
3405
3406 static void
3407 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3408 {
3409         struct sctp_association *asoc;
3410         struct sctp_tmit_chunk *chk;
3411
3412         asoc = &stcb->asoc;
3413         chk = asoc->str_reset;
3414         if (chk == NULL) {
3415                 return;
3416         }
3417         asoc->str_reset = NULL;
3418         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3419             NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3420         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3421         asoc->ctrl_queue_cnt--;
3422         if (chk->data) {
3423                 sctp_m_freem(chk->data);
3424                 chk->data = NULL;
3425         }
3426         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3427 }
3428
3429 static int
3430 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3431     uint32_t seq, uint32_t action,
3432     struct sctp_stream_reset_response *respin)
3433 {
3434         uint16_t type;
3435         int lparam_len;
3436         struct sctp_association *asoc = &stcb->asoc;
3437         struct sctp_tmit_chunk *chk;
3438         struct sctp_stream_reset_request *req_param;
3439         struct sctp_stream_reset_out_request *req_out_param;
3440         struct sctp_stream_reset_in_request *req_in_param;
3441         uint32_t number_entries;
3442
3443         if (asoc->stream_reset_outstanding == 0) {
3444                 /* duplicate */
3445                 return (0);
3446         }
3447         if (seq == stcb->asoc.str_reset_seq_out) {
3448                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3449                 if (req_param != NULL) {
3450                         stcb->asoc.str_reset_seq_out++;
3451                         type = ntohs(req_param->ph.param_type);
3452                         lparam_len = ntohs(req_param->ph.param_length);
3453                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3454                                 int no_clear = 0;
3455
3456                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3457                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3458                                 asoc->stream_reset_out_is_outstanding = 0;
3459                                 if (asoc->stream_reset_outstanding)
3460                                         asoc->stream_reset_outstanding--;
3461                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3462                                         /* do it */
3463                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3464                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3465                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3466                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3467                                         /*
3468                                          * Set it up so we don't stop
3469                                          * retransmitting
3470                                          */
3471                                         asoc->stream_reset_outstanding++;
3472                                         stcb->asoc.str_reset_seq_out--;
3473                                         asoc->stream_reset_out_is_outstanding = 1;
3474                                         no_clear = 1;
3475                                 } else {
3476                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3477                                 }
3478                                 if (no_clear == 0) {
3479                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3480                                 }
3481                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3482                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3483                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3484                                 if (asoc->stream_reset_outstanding)
3485                                         asoc->stream_reset_outstanding--;
3486                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3487                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3488                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3489                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3490                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3491                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3492                                 }
3493                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3494                                 /* Ok we now may have more streams */
3495                                 int num_stream;
3496
3497                                 num_stream = stcb->asoc.strm_pending_add_size;
3498                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3499                                         /* TSNH */
3500                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3501                                 }
3502                                 stcb->asoc.strm_pending_add_size = 0;
3503                                 if (asoc->stream_reset_outstanding)
3504                                         asoc->stream_reset_outstanding--;
3505                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3506                                         /* Put the new streams into effect */
3507                                         int i;
3508
3509                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3510                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3511                                         }
3512                                         asoc->streamoutcnt += num_stream;
3513                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3514                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3515                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD, stcb, SCTP_STREAM_CHANGE_DENIED, NULL, SCTP_SO_NOT_LOCKED);
3516                                 } else {
3517                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD, stcb, SCTP_STREAM_CHANGE_FAILED, NULL, SCTP_SO_NOT_LOCKED);
3518                                 }
3519                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3520                                 if (asoc->stream_reset_outstanding)
3521                                         asoc->stream_reset_outstanding--;
3522                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3523                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD, stcb, SCTP_STREAM_CHANGE_DENIED, NULL, SCTP_SO_NOT_LOCKED);
3524                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3525                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD, stcb, SCTP_STREAM_CHANGE_DENIED, NULL, SCTP_SO_NOT_LOCKED);
3526                                 }
3527                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3528                                 /**
3529                                  * a) Adopt the new in tsn.
3530                                  * b) reset the map
3531                                  * c) Adopt the new out-tsn
3532                                  */
3533                                 struct sctp_stream_reset_response_tsn *resp;
3534                                 struct sctp_forward_tsn_chunk fwdtsn;
3535                                 int abort_flag = 0;
3536
3537                                 if (respin == NULL) {
3538                                         /* huh ? */
3539                                         return (0);
3540                                 }
3541                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3542                                         return (0);
3543                                 }
3544                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3545                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3546                                         asoc->stream_reset_outstanding--;
3547                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3548                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3549                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3550                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3551                                         if (abort_flag) {
3552                                                 return (1);
3553                                         }
3554                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3555                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3556                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3557                                         }
3558
3559                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3560                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3561                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3562
3563                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3564                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3565
3566                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3567                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3568
3569                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3570                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3571                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_TSN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3572                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3573                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_TSN, stcb, SCTP_ASSOC_RESET_DENIED, NULL, SCTP_SO_NOT_LOCKED);
3574                                 } else {
3575                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_TSN, stcb, SCTP_ASSOC_RESET_FAILED, NULL, SCTP_SO_NOT_LOCKED);
3576                                 }
3577                         }
3578                         /* get rid of the request and get the request flags */
3579                         if (asoc->stream_reset_outstanding == 0) {
3580                                 sctp_clean_up_stream_reset(stcb);
3581                         }
3582                 }
3583         }
3584         if (asoc->stream_reset_outstanding == 0) {
3585                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3586         }
3587         return (0);
3588 }
3589
3590 static void
3591 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3592     struct sctp_tmit_chunk *chk,
3593     struct sctp_stream_reset_in_request *req, int trunc)
3594 {
3595         uint32_t seq;
3596         int len, i;
3597         int number_entries;
3598         uint16_t temp;
3599
3600         /*
3601          * peer wants me to send a str-reset to him for my outgoing seq's if
3602          * seq_in is right.
3603          */
3604         struct sctp_association *asoc = &stcb->asoc;
3605
3606         seq = ntohl(req->request_seq);
3607         if (asoc->str_reset_seq_in == seq) {
3608                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3609                 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) {
3610                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3611                 } else if (trunc) {
3612                         /* Can't do it, since they exceeded our buffer size  */
3613                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3614                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3615                         len = ntohs(req->ph.param_length);
3616                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3617                         if (number_entries) {
3618                                 for (i = 0; i < number_entries; i++) {
3619                                         temp = ntohs(req->list_of_streams[i]);
3620                                         if (temp >= stcb->asoc.streamoutcnt) {
3621                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3622                                                 goto bad_boy;
3623                                         }
3624                                         req->list_of_streams[i] = temp;
3625                                 }
3626                                 for (i = 0; i < number_entries; i++) {
3627                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3628                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3629                                         }
3630                                 }
3631                         } else {
3632                                 /* Its all */
3633                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3634                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3635                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3636                                 }
3637                         }
3638                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3639                 } else {
3640                         /* Can't do it, since we have sent one out */
3641                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3642                 }
3643 bad_boy:
3644                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3645                 asoc->str_reset_seq_in++;
3646         } else if (asoc->str_reset_seq_in - 1 == seq) {
3647                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3648         } else if (asoc->str_reset_seq_in - 2 == seq) {
3649                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3650         } else {
3651                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3652         }
3653         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3654 }
3655
3656 static int
3657 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3658     struct sctp_tmit_chunk *chk,
3659     struct sctp_stream_reset_tsn_request *req)
3660 {
3661         /* reset all in and out and update the tsn */
3662         /*
3663          * A) reset my str-seq's on in and out. B) Select a receive next,
3664          * and set cum-ack to it. Also process this selected number as a
3665          * fwd-tsn as well. C) set in the response my next sending seq.
3666          */
3667         struct sctp_forward_tsn_chunk fwdtsn;
3668         struct sctp_association *asoc = &stcb->asoc;
3669         int abort_flag = 0;
3670         uint32_t seq;
3671
3672         seq = ntohl(req->request_seq);
3673         if (asoc->str_reset_seq_in == seq) {
3674                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3675                 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) {
3676                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3677                 } else {
3678                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3679                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3680                         fwdtsn.ch.chunk_flags = 0;
3681                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3682                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3683                         if (abort_flag) {
3684                                 return (1);
3685                         }
3686                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3687                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3688                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3689                         }
3690                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3691                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3692                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3693                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3694                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3695                         atomic_add_int(&asoc->sending_seq, 1);
3696                         /* save off historical data for retrans */
3697                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3698                         asoc->last_sending_seq[0] = asoc->sending_seq;
3699                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3700                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3701                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3702                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3703                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3704                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_TSN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3705                 }
3706                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3707                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3708                 asoc->str_reset_seq_in++;
3709         } else if (asoc->str_reset_seq_in - 1 == seq) {
3710                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3711                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3712         } else if (asoc->str_reset_seq_in - 2 == seq) {
3713                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3714                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3715         } else {
3716                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3717         }
3718         return (0);
3719 }
3720
3721 static void
3722 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3723     struct sctp_tmit_chunk *chk,
3724     struct sctp_stream_reset_out_request *req, int trunc)
3725 {
3726         uint32_t seq, tsn;
3727         int number_entries, len;
3728         struct sctp_association *asoc = &stcb->asoc;
3729
3730         seq = ntohl(req->request_seq);
3731
3732         /* now if its not a duplicate we process it */
3733         if (asoc->str_reset_seq_in == seq) {
3734                 len = ntohs(req->ph.param_length);
3735                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3736                 /*
3737                  * the sender is resetting, handle the list issue.. we must
3738                  * a) verify if we can do the reset, if so no problem b) If
3739                  * we can't do the reset we must copy the request. c) queue
3740                  * it, and setup the data in processor to trigger it off
3741                  * when needed and dequeue all the queued data.
3742                  */
3743                 tsn = ntohl(req->send_reset_at_tsn);
3744
3745                 /* move the reset action back one */
3746                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3747                 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) {
3748                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3749                 } else if (trunc) {
3750                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3751                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3752                         /* we can do it now */
3753                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3754                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3755                 } else {
3756                         /*
3757                          * we must queue it up and thus wait for the TSN's
3758                          * to arrive that are at or before tsn
3759                          */
3760                         struct sctp_stream_reset_list *liste;
3761                         int siz;
3762
3763                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3764                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3765                             siz, SCTP_M_STRESET);
3766                         if (liste == NULL) {
3767                                 /* gak out of memory */
3768                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3769                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3770                                 return;
3771                         }
3772                         liste->seq = seq;
3773                         liste->tsn = tsn;
3774                         liste->number_entries = number_entries;
3775                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3776                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3777                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3778                 }
3779                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3780                 asoc->str_reset_seq_in++;
3781         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3782                 /*
3783                  * one seq back, just echo back last action since my
3784                  * response was lost.
3785                  */
3786                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3787         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3788                 /*
3789                  * two seq back, just echo back last action since my
3790                  * response was lost.
3791                  */
3792                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3793         } else {
3794                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3795         }
3796 }
3797
3798 static void
3799 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3800     struct sctp_stream_reset_add_strm *str_add)
3801 {
3802         /*
3803          * Peer is requesting to add more streams. If its within our
3804          * max-streams we will allow it.
3805          */
3806         uint32_t num_stream, i;
3807         uint32_t seq;
3808         struct sctp_association *asoc = &stcb->asoc;
3809         struct sctp_queued_to_read *ctl, *nctl;
3810
3811         /* Get the number. */
3812         seq = ntohl(str_add->request_seq);
3813         num_stream = ntohs(str_add->number_of_streams);
3814         /* Now what would be the new total? */
3815         if (asoc->str_reset_seq_in == seq) {
3816                 num_stream += stcb->asoc.streamincnt;
3817                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3818                 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) {
3819                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3820                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3821                     (num_stream > 0xffff)) {
3822                         /* We must reject it they ask for to many */
3823         denied:
3824                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3825                 } else {
3826                         /* Ok, we can do that :-) */
3827                         struct sctp_stream_in *oldstrm;
3828
3829                         /* save off the old */
3830                         oldstrm = stcb->asoc.strmin;
3831                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3832                             (num_stream * sizeof(struct sctp_stream_in)),
3833                             SCTP_M_STRMI);
3834                         if (stcb->asoc.strmin == NULL) {
3835                                 stcb->asoc.strmin = oldstrm;
3836                                 goto denied;
3837                         }
3838                         /* copy off the old data */
3839                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3840                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3841                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3842                                 stcb->asoc.strmin[i].sid = i;
3843                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
3844                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3845                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
3846                                 /* now anything on those queues? */
3847                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
3848                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
3849                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
3850                                 }
3851                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
3852                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
3853                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
3854                                 }
3855                         }
3856                         /* Init the new streams */
3857                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3858                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3859                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3860                                 stcb->asoc.strmin[i].sid = i;
3861                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3862                                 stcb->asoc.strmin[i].pd_api_started = 0;
3863                                 stcb->asoc.strmin[i].delivery_started = 0;
3864                         }
3865                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3866                         /* update the size */
3867                         stcb->asoc.streamincnt = num_stream;
3868                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3869                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3870                 }
3871                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3872                 asoc->str_reset_seq_in++;
3873         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3874                 /*
3875                  * one seq back, just echo back last action since my
3876                  * response was lost.
3877                  */
3878                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3879         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3880                 /*
3881                  * two seq back, just echo back last action since my
3882                  * response was lost.
3883                  */
3884                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3885         } else {
3886                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3887         }
3888 }
3889
3890 static void
3891 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3892     struct sctp_stream_reset_add_strm *str_add)
3893 {
3894         /*
3895          * Peer is requesting to add more streams. If its within our
3896          * max-streams we will allow it.
3897          */
3898         uint16_t num_stream;
3899         uint32_t seq;
3900         struct sctp_association *asoc = &stcb->asoc;
3901
3902         /* Get the number. */
3903         seq = ntohl(str_add->request_seq);
3904         num_stream = ntohs(str_add->number_of_streams);
3905         /* Now what would be the new total? */
3906         if (asoc->str_reset_seq_in == seq) {
3907                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3908                 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) {
3909                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3910                 } else if (stcb->asoc.stream_reset_outstanding) {
3911                         /* We must reject it we have something pending */
3912                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3913                 } else {
3914                         /* Ok, we can do that :-) */
3915                         int mychk;
3916
3917                         mychk = stcb->asoc.streamoutcnt;
3918                         mychk += num_stream;
3919                         if (mychk < 0x10000) {
3920                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3921                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
3922                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3923                                 }
3924                         } else {
3925                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3926                         }
3927                 }
3928                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
3929                 asoc->str_reset_seq_in++;
3930         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3931                 /*
3932                  * one seq back, just echo back last action since my
3933                  * response was lost.
3934                  */
3935                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3936         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3937                 /*
3938                  * two seq back, just echo back last action since my
3939                  * response was lost.
3940                  */
3941                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3942         } else {
3943                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3944         }
3945 }
3946
3947 #ifdef __GNUC__
3948 __attribute__((noinline))
3949 #endif
3950 static int
3951 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3952     struct sctp_chunkhdr *ch_req)
3953 {
3954         uint16_t remaining_length, param_len, ptype;
3955         struct sctp_paramhdr pstore;
3956         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3957         uint32_t seq = 0;
3958         int num_req = 0;
3959         int trunc = 0;
3960         struct sctp_tmit_chunk *chk;
3961         struct sctp_chunkhdr *ch;
3962         struct sctp_paramhdr *ph;
3963         int ret_code = 0;
3964         int num_param = 0;
3965
3966         /* now it may be a reset or a reset-response */
3967         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
3968
3969         /* setup for adding the response */
3970         sctp_alloc_a_chunk(stcb, chk);
3971         if (chk == NULL) {
3972                 return (ret_code);
3973         }
3974         chk->copy_by_ref = 0;
3975         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3976         chk->rec.chunk_id.can_take_data = 0;
3977         chk->flags = 0;
3978         chk->asoc = &stcb->asoc;
3979         chk->no_fr_allowed = 0;
3980         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3981         chk->book_size_scale = 0;
3982         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
3983         if (chk->data == NULL) {
3984 strres_nochunk:
3985                 if (chk->data) {
3986                         sctp_m_freem(chk->data);
3987                         chk->data = NULL;
3988                 }
3989                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3990                 return (ret_code);
3991         }
3992         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
3993
3994         /* setup chunk parameters */
3995         chk->sent = SCTP_DATAGRAM_UNSENT;
3996         chk->snd_count = 0;
3997         chk->whoTo = NULL;
3998
3999         ch = mtod(chk->data, struct sctp_chunkhdr *);
4000         ch->chunk_type = SCTP_STREAM_RESET;
4001         ch->chunk_flags = 0;
4002         ch->chunk_length = htons(chk->send_size);
4003         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4004         offset += sizeof(struct sctp_chunkhdr);
4005         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4006                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4007                 if (ph == NULL) {
4008                         /* TSNH */
4009                         break;
4010                 }
4011                 param_len = ntohs(ph->param_length);
4012                 if ((param_len > remaining_length) ||
4013                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4014                         /* bad parameter length */
4015                         break;
4016                 }
4017                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4018                     (uint8_t *)&cstore);
4019                 if (ph == NULL) {
4020                         /* TSNH */
4021                         break;
4022                 }
4023                 ptype = ntohs(ph->param_type);
4024                 num_param++;
4025                 if (param_len > sizeof(cstore)) {
4026                         trunc = 1;
4027                 } else {
4028                         trunc = 0;
4029                 }
4030                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4031                         /* hit the max of parameters already sorry.. */
4032                         break;
4033                 }
4034                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4035                         struct sctp_stream_reset_out_request *req_out;
4036
4037                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4038                                 break;
4039                         }
4040                         req_out = (struct sctp_stream_reset_out_request *)ph;
4041                         num_req++;
4042                         if (stcb->asoc.stream_reset_outstanding) {
4043                                 seq = ntohl(req_out->response_seq);
4044                                 if (seq == stcb->asoc.str_reset_seq_out) {
4045                                         /* implicit ack */
4046                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4047                                 }
4048                         }
4049                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4050                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4051                         struct sctp_stream_reset_add_strm *str_add;
4052
4053                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4054                                 break;
4055                         }
4056                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4057                         num_req++;
4058                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4059                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4060                         struct sctp_stream_reset_add_strm *str_add;
4061
4062                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4063                                 break;
4064                         }
4065                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4066                         num_req++;
4067                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4068                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4069                         struct sctp_stream_reset_in_request *req_in;
4070
4071                         num_req++;
4072                         req_in = (struct sctp_stream_reset_in_request *)ph;
4073                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4074                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4075                         struct sctp_stream_reset_tsn_request *req_tsn;
4076
4077                         num_req++;
4078                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4079                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4080                                 ret_code = 1;
4081                                 goto strres_nochunk;
4082                         }
4083                         /* no more */
4084                         break;
4085                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4086                         struct sctp_stream_reset_response *resp;
4087                         uint32_t result;
4088
4089                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4090                                 break;
4091                         }
4092                         resp = (struct sctp_stream_reset_response *)ph;
4093                         seq = ntohl(resp->response_seq);
4094                         result = ntohl(resp->result);
4095                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4096                                 ret_code = 1;
4097                                 goto strres_nochunk;
4098                         }
4099                 } else {
4100                         break;
4101                 }
4102                 offset += SCTP_SIZE32(param_len);
4103                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4104                         remaining_length -= SCTP_SIZE32(param_len);
4105                 } else {
4106                         remaining_length = 0;
4107                 }
4108         }
4109         if (num_req == 0) {
4110                 /* we have no response free the stuff */
4111                 goto strres_nochunk;
4112         }
4113         /* ok we have a chunk to link in */
4114         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4115             chk,
4116             sctp_next);
4117         stcb->asoc.ctrl_queue_cnt++;
4118         return (ret_code);
4119 }
4120
4121 /*
4122  * Handle a router or endpoints report of a packet loss, there are two ways
4123  * to handle this, either we get the whole packet and must disect it
4124  * ourselves (possibly with truncation and or corruption) or it is a summary
4125  * from a middle box that did the disecting for us.
4126  */
4127 static void
4128 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4129     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4130 {
4131         struct sctp_chunk_desc desc;
4132         struct sctp_chunkhdr *chk_hdr;
4133         struct sctp_data_chunk *data_chunk;
4134         struct sctp_idata_chunk *idata_chunk;
4135         uint32_t bottle_bw, on_queue;
4136         uint32_t offset, chk_len;
4137         uint16_t pktdrp_len;
4138         uint8_t pktdrp_flags;
4139
4140         KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
4141             ("PKTDROP chunk too small"));
4142         pktdrp_flags = cp->ch.chunk_flags;
4143         pktdrp_len = ntohs(cp->ch.chunk_length);
4144         KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
4145         if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
4146                 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
4147                         /* The peer plays games with us. */
4148                         return;
4149                 }
4150         }
4151         limit -= sizeof(struct sctp_pktdrop_chunk);
4152         offset = 0;
4153         if (offset == limit) {
4154                 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4155                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4156                 }
4157         } else if (offset + sizeof(struct sctphdr) > limit) {
4158                 /* Only a partial SCTP common header. */
4159                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4160                 offset = limit;
4161         } else {
4162                 /* XXX: Check embedded SCTP common header. */
4163                 offset += sizeof(struct sctphdr);
4164         }
4165         /* Now parse through the chunks themselves. */
4166         while (offset < limit) {
4167                 if (offset + sizeof(struct sctp_chunkhdr) > limit) {
4168                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4169                         break;
4170                 }
4171                 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
4172                 desc.chunk_type = chk_hdr->chunk_type;
4173                 /* get amount we need to move */
4174                 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
4175                 if (chk_len < sizeof(struct sctp_chunkhdr)) {
4176                         /* Someone is lying... */
4177                         break;
4178                 }
4179                 if (desc.chunk_type == SCTP_DATA) {
4180                         if (stcb->asoc.idata_supported) {
4181                                 /* Some is playing games with us. */
4182                                 break;
4183                         }
4184                         if (chk_len <= sizeof(struct sctp_data_chunk)) {
4185                                 /* Some is playing games with us. */
4186                                 break;
4187                         }
4188                         if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4189                                 /*
4190                                  * Not enough data bytes available in the
4191                                  * chunk.
4192                                  */
4193                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4194                                 goto next_chunk;
4195                         }
4196                         if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4197                                 /* Not enough data in buffer. */
4198                                 break;
4199                         }
4200                         data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
4201                         memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4202                         desc.tsn_ifany = data_chunk->dp.tsn;
4203                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4204                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4205                         }
4206                 } else if (desc.chunk_type == SCTP_IDATA) {
4207                         if (!stcb->asoc.idata_supported) {
4208                                 /* Some is playing games with us. */
4209                                 break;
4210                         }
4211                         if (chk_len <= sizeof(struct sctp_idata_chunk)) {
4212                                 /* Some is playing games with us. */
4213                                 break;
4214                         }
4215                         if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4216                                 /*
4217                                  * Not enough data bytes available in the
4218                                  * chunk.
4219                                  */
4220                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4221                                 goto next_chunk;
4222                         }
4223                         if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4224                                 /* Not enough data in buffer. */
4225                                 break;
4226                         }
4227                         idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
4228                         memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4229                         desc.tsn_ifany = idata_chunk->dp.tsn;
4230                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4231                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4232                         }
4233                 } else {
4234                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4235                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4236                         }
4237                 }
4238                 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
4239                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4240                         break;
4241                 }
4242 next_chunk:
4243                 offset += SCTP_SIZE32(chk_len);
4244         }
4245         /* Now update any rwnd --- possibly */
4246         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4247                 /* From a peer, we get a rwnd report */
4248                 uint32_t a_rwnd;
4249
4250                 SCTP_STAT_INCR(sctps_pdrpfehos);
4251
4252                 bottle_bw = ntohl(cp->bottle_bw);
4253                 on_queue = ntohl(cp->current_onq);
4254                 if (bottle_bw && on_queue) {
4255                         /* a rwnd report is in here */
4256                         if (bottle_bw > on_queue)
4257                                 a_rwnd = bottle_bw - on_queue;
4258                         else
4259                                 a_rwnd = 0;
4260
4261                         if (a_rwnd == 0)
4262                                 stcb->asoc.peers_rwnd = 0;
4263                         else {
4264                                 if (a_rwnd > stcb->asoc.total_flight) {
4265                                         stcb->asoc.peers_rwnd =
4266                                             a_rwnd - stcb->asoc.total_flight;
4267                                 } else {
4268                                         stcb->asoc.peers_rwnd = 0;
4269                                 }
4270                                 if (stcb->asoc.peers_rwnd <
4271                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4272                                         /* SWS sender side engages */
4273                                         stcb->asoc.peers_rwnd = 0;
4274                                 }
4275                         }
4276                 }
4277         } else {
4278                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4279         }
4280
4281         /* now middle boxes in sat networks get a cwnd bump */
4282         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
4283             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4284             (stcb->asoc.sat_network)) {
4285                 /*
4286                  * This is debatable but for sat networks it makes sense
4287                  * Note if a T3 timer has went off, we will prohibit any
4288                  * changes to cwnd until we exit the t3 loss recovery.
4289                  */
4290                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4291                     net, cp, &bottle_bw, &on_queue);
4292         }
4293 }
4294
4295 /*
4296  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4297  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4298  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4299  * length of the complete packet outputs: - length: modified to remaining
4300  * length after control processing - netp: modified to new sctp_nets after
4301  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4302  * bad packet,...) otherwise return the tcb for this packet
4303  */
4304 #ifdef __GNUC__
4305 __attribute__((noinline))
4306 #endif
4307 static struct sctp_tcb *
4308 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4309     struct sockaddr *src, struct sockaddr *dst,
4310     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4311     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4312     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4313     uint32_t vrf_id, uint16_t port)
4314 {
4315         struct sctp_association *asoc;
4316         struct mbuf *op_err;
4317         char msg[SCTP_DIAG_INFO_LEN];
4318         uint32_t vtag_in;
4319         int num_chunks = 0;     /* number of control chunks processed */
4320         uint32_t chk_length, contiguous;
4321         int ret;
4322         int abort_no_unlock = 0;
4323         int ecne_seen = 0;
4324         int abort_flag;
4325
4326         /*
4327          * How big should this be, and should it be alloc'd? Lets try the
4328          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4329          * until we get into jumbo grams and such..
4330          */
4331         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4332         int got_auth = 0;
4333         uint32_t auth_offset = 0, auth_len = 0;
4334         int auth_skipped = 0;
4335         int asconf_cnt = 0;
4336
4337         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4338             iphlen, *offset, length, (void *)stcb);
4339
4340         if (stcb) {
4341                 SCTP_TCB_LOCK_ASSERT(stcb);
4342         }
4343         /* validate chunk header length... */
4344         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4345                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4346                     ntohs(ch->chunk_length));
4347                 *offset = length;
4348                 return (stcb);
4349         }
4350         /*
4351          * validate the verification tag
4352          */
4353         vtag_in = ntohl(sh->v_tag);
4354
4355         if (ch->chunk_type == SCTP_INITIATION) {
4356                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4357                     ntohs(ch->chunk_length), vtag_in);
4358                 if (vtag_in != 0) {
4359                         /* protocol error- silently discard... */
4360                         SCTP_STAT_INCR(sctps_badvtag);
4361                         if (stcb != NULL) {
4362                                 SCTP_TCB_UNLOCK(stcb);
4363                         }
4364                         return (NULL);
4365                 }
4366         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4367                 /*
4368                  * If there is no stcb, skip the AUTH chunk and process
4369                  * later after a stcb is found (to validate the lookup was
4370                  * valid.
4371                  */
4372                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4373                     (stcb == NULL) &&
4374                     (inp->auth_supported == 1)) {
4375                         /* save this chunk for later processing */
4376                         auth_skipped = 1;
4377                         auth_offset = *offset;
4378                         auth_len = ntohs(ch->chunk_length);
4379
4380                         /* (temporarily) move past this chunk */
4381                         *offset += SCTP_SIZE32(auth_len);
4382                         if (*offset >= length) {
4383                                 /* no more data left in the mbuf chain */
4384                                 *offset = length;
4385                                 return (NULL);
4386                         }
4387                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4388                             sizeof(struct sctp_chunkhdr), chunk_buf);
4389                 }
4390                 if (ch == NULL) {
4391                         /* Help */
4392                         *offset = length;
4393                         return (stcb);
4394                 }
4395                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4396                         goto process_control_chunks;
4397                 }
4398                 /*
4399                  * first check if it's an ASCONF with an unknown src addr we
4400                  * need to look inside to find the association
4401                  */
4402                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4403                         struct sctp_chunkhdr *asconf_ch = ch;
4404                         uint32_t asconf_offset = 0, asconf_len = 0;
4405
4406                         /* inp's refcount may be reduced */
4407                         SCTP_INP_INCR_REF(inp);
4408
4409                         asconf_offset = *offset;
4410                         do {
4411                                 asconf_len = ntohs(asconf_ch->chunk_length);
4412                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4413                                         break;
4414                                 stcb = sctp_findassociation_ep_asconf(m,
4415                                     *offset,
4416                                     dst,
4417                                     sh, &inp, netp, vrf_id);
4418                                 if (stcb != NULL)
4419                                         break;
4420                                 asconf_offset += SCTP_SIZE32(asconf_len);
4421                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4422                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4423                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4424                         if (stcb == NULL) {
4425                                 /*
4426                                  * reduce inp's refcount if not reduced in
4427                                  * sctp_findassociation_ep_asconf().
4428                                  */
4429                                 SCTP_INP_DECR_REF(inp);
4430                         }
4431
4432                         /* now go back and verify any auth chunk to be sure */
4433                         if (auth_skipped && (stcb != NULL)) {
4434                                 struct sctp_auth_chunk *auth;
4435
4436                                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
4437                                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
4438                                         got_auth = 1;
4439                                         auth_skipped = 0;
4440                                 } else {
4441                                         auth = NULL;
4442                                 }
4443                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4444                                     auth_offset)) {
4445                                         /* auth HMAC failed so dump it */
4446                                         *offset = length;
4447                                         return (stcb);
4448                                 } else {
4449                                         /* remaining chunks are HMAC checked */
4450                                         stcb->asoc.authenticated = 1;
4451                                 }
4452                         }
4453                 }
4454                 if (stcb == NULL) {
4455                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4456                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4457                             msg);
4458                         /* no association, so it's out of the blue... */
4459                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4460                             mflowtype, mflowid, inp->fibnum,
4461                             vrf_id, port);
4462                         *offset = length;
4463                         return (NULL);
4464                 }
4465                 asoc = &stcb->asoc;
4466                 /* ABORT and SHUTDOWN can use either v_tag... */
4467                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4468                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4469                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4470                         /* Take the T-bit always into account. */
4471                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4472                             (vtag_in == asoc->my_vtag)) ||
4473                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4474                             (asoc->peer_vtag != htonl(0)) &&
4475                             (vtag_in == asoc->peer_vtag))) {
4476                                 /* this is valid */
4477                         } else {
4478                                 /* drop this packet... */
4479                                 SCTP_STAT_INCR(sctps_badvtag);
4480                                 if (stcb != NULL) {
4481                                         SCTP_TCB_UNLOCK(stcb);
4482                                 }
4483                                 return (NULL);
4484                         }
4485                 } else {
4486                         /* for all other chunks, vtag must match */
4487                         if (vtag_in != asoc->my_vtag) {
4488                                 /* invalid vtag... */
4489                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4490                                     "invalid vtag: %xh, expect %xh\n",
4491                                     vtag_in, asoc->my_vtag);
4492                                 SCTP_STAT_INCR(sctps_badvtag);
4493                                 if (stcb != NULL) {
4494                                         SCTP_TCB_UNLOCK(stcb);
4495                                 }
4496                                 *offset = length;
4497                                 return (NULL);
4498                         }
4499                 }
4500         }                       /* end if !SCTP_COOKIE_ECHO */
4501         /*
4502          * process all control chunks...
4503          */
4504         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4505             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4506             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4507             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4508                 /* implied cookie-ack.. we must have lost the ack */
4509                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4510                     *netp);
4511         }
4512
4513 process_control_chunks:
4514         while (IS_SCTP_CONTROL(ch)) {
4515                 /* validate chunk length */
4516                 chk_length = ntohs(ch->chunk_length);
4517                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4518                     ch->chunk_type, chk_length);
4519                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4520                 if (chk_length < sizeof(*ch) ||
4521                     (*offset + (int)chk_length) > length) {
4522                         *offset = length;
4523                         return (stcb);
4524                 }
4525                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4526                 /*
4527                  * INIT and INIT-ACK only gets the init ack "header" portion
4528                  * only because we don't have to process the peer's COOKIE.
4529                  * All others get a complete chunk.
4530                  */
4531                 switch (ch->chunk_type) {
4532                 case SCTP_INITIATION:
4533                         contiguous = sizeof(struct sctp_init_chunk);
4534                         break;
4535                 case SCTP_INITIATION_ACK:
4536                         contiguous = sizeof(struct sctp_init_ack_chunk);
4537                         break;
4538                 default:
4539                         contiguous = min(chk_length, sizeof(chunk_buf));
4540                         break;
4541                 }
4542                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4543                     contiguous,
4544                     chunk_buf);
4545                 if (ch == NULL) {
4546                         *offset = length;
4547                         return (stcb);
4548                 }
4549
4550                 num_chunks++;
4551                 /* Save off the last place we got a control from */
4552                 if (stcb != NULL) {
4553                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4554                                 /*
4555                                  * allow last_control to be NULL if
4556                                  * ASCONF... ASCONF processing will find the
4557                                  * right net later
4558                                  */
4559                                 if ((netp != NULL) && (*netp != NULL))
4560                                         stcb->asoc.last_control_chunk_from = *netp;
4561                         }
4562                 }
4563 #ifdef SCTP_AUDITING_ENABLED
4564                 sctp_audit_log(0xB0, ch->chunk_type);
4565 #endif
4566
4567                 /* check to see if this chunk required auth, but isn't */
4568                 if ((stcb != NULL) &&
4569                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4570                     !stcb->asoc.authenticated) {
4571                         /* "silently" ignore */
4572                         SCTP_STAT_INCR(sctps_recvauthmissing);
4573                         goto next_chunk;
4574                 }
4575                 switch (ch->chunk_type) {
4576                 case SCTP_INITIATION:
4577                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4578                         /* The INIT chunk must be the only chunk. */
4579                         if ((num_chunks > 1) ||
4580                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4581                                 /*
4582                                  * RFC 4960bis requires stopping the
4583                                  * processing of the packet.
4584                                  */
4585                                 *offset = length;
4586                                 return (stcb);
4587                         }
4588                         /* Honor our resource limit. */
4589                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4590                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4591                                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
4592                                     mflowtype, mflowid, inp->fibnum,
4593                                     vrf_id, port);
4594                                 *offset = length;
4595                                 if (stcb != NULL) {
4596                                         SCTP_TCB_UNLOCK(stcb);
4597                                 }
4598                                 return (NULL);
4599                         }
4600                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4601                             (struct sctp_init_chunk *)ch, inp,
4602                             stcb, *netp,
4603                             mflowtype, mflowid,
4604                             vrf_id, port);
4605                         *offset = length;
4606                         if (stcb != NULL) {
4607                                 SCTP_TCB_UNLOCK(stcb);
4608                         }
4609                         return (NULL);
4610                         break;
4611                 case SCTP_PAD_CHUNK:
4612                         break;
4613                 case SCTP_INITIATION_ACK:
4614                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4615                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4616                                 /* We are not interested anymore */
4617                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4618                                         ;
4619                                 } else {
4620                                         *offset = length;
4621                                         if (stcb != NULL) {
4622                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4623                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4624                                         }
4625                                         return (NULL);
4626                                 }
4627                         }
4628                         /* The INIT-ACK chunk must be the only chunk. */
4629                         if ((num_chunks > 1) ||
4630                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4631                                 *offset = length;
4632                                 return (stcb);
4633                         }
4634                         if ((netp != NULL) && (*netp != NULL)) {
4635                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4636                                     src, dst, sh,
4637                                     (struct sctp_init_ack_chunk *)ch,
4638                                     stcb, *netp,
4639                                     &abort_no_unlock,
4640                                     mflowtype, mflowid,
4641                                     vrf_id);
4642                         } else {
4643                                 ret = -1;
4644                         }
4645                         *offset = length;
4646                         if (abort_no_unlock) {
4647                                 return (NULL);
4648                         }
4649                         /*
4650                          * Special case, I must call the output routine to
4651                          * get the cookie echoed
4652                          */
4653                         if ((stcb != NULL) && (ret == 0)) {
4654                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4655                         }
4656                         return (stcb);
4657                         break;
4658                 case SCTP_SELECTIVE_ACK:
4659                 case SCTP_NR_SELECTIVE_ACK:
4660                         {
4661                                 int abort_now = 0;
4662                                 uint32_t a_rwnd, cum_ack;
4663                                 uint16_t num_seg, num_nr_seg, num_dup;
4664                                 uint8_t flags;
4665                                 int offset_seg, offset_dup;
4666
4667                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4668                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4669                                 SCTP_STAT_INCR(sctps_recvsacks);
4670                                 if (stcb == NULL) {
4671                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4672                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4673                                         break;
4674                                 }
4675                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4676                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4677                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4678                                                 break;
4679                                         }
4680                                 } else {
4681                                         if (stcb->asoc.nrsack_supported == 0) {
4682                                                 goto unknown_chunk;
4683                                         }
4684                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4685                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4686                                                 break;
4687                                         }
4688                                 }
4689                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4690                                         /*-
4691                                          * If we have sent a shutdown-ack, we will pay no
4692                                          * attention to a sack sent in to us since
4693                                          * we don't care anymore.
4694                                          */
4695                                         break;
4696                                 }
4697                                 flags = ch->chunk_flags;
4698                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4699                                         struct sctp_sack_chunk *sack;
4700
4701                                         sack = (struct sctp_sack_chunk *)ch;
4702                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4703                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4704                                         num_nr_seg = 0;
4705                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4706                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4707                                         if (sizeof(struct sctp_sack_chunk) +
4708                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4709                                             num_dup * sizeof(uint32_t) != chk_length) {
4710                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4711                                                 break;
4712                                         }
4713                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4714                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4715                                 } else {
4716                                         struct sctp_nr_sack_chunk *nr_sack;
4717
4718                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4719                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4720                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4721                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4722                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4723                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4724                                         if (sizeof(struct sctp_nr_sack_chunk) +
4725                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4726                                             num_dup * sizeof(uint32_t) != chk_length) {
4727                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4728                                                 break;
4729                                         }
4730                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4731                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4732                                 }
4733                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4734                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4735                                     cum_ack, num_seg, a_rwnd);
4736                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4737                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4738                                     (num_seg == 0) && (num_nr_seg == 0) &&
4739                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4740                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4741                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4742                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4743                                         /*
4744                                          * We have a SIMPLE sack having no
4745                                          * prior segments and data on sent
4746                                          * queue to be acked. Use the faster
4747                                          * path sack processing. We also
4748                                          * allow window update sacks with no
4749                                          * missing segments to go this way
4750                                          * too.
4751                                          */
4752                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4753                                             &abort_now, ecne_seen);
4754                                 } else {
4755                                         if ((netp != NULL) && (*netp != NULL)) {
4756                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4757                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4758                                                     cum_ack, a_rwnd, ecne_seen);
4759                                         }
4760                                 }
4761                                 if (abort_now) {
4762                                         /* ABORT signal from sack processing */
4763                                         *offset = length;
4764                                         return (NULL);
4765                                 }
4766                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4767                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4768                                     (stcb->asoc.stream_queue_cnt == 0)) {
4769                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4770                                 }
4771                                 break;
4772                         }
4773                 case SCTP_HEARTBEAT_REQUEST:
4774                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4775                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4776                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4777                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4778                                     chk_length, *netp);
4779                         }
4780                         break;
4781                 case SCTP_HEARTBEAT_ACK:
4782                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
4783                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4784                                 /* Its not ours */
4785                                 break;
4786                         }
4787                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4788                         if ((netp != NULL) && (*netp != NULL)) {
4789                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4790                                     stcb, *netp);
4791                         }
4792                         break;
4793                 case SCTP_ABORT_ASSOCIATION:
4794                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4795                             (void *)stcb);
4796                         *offset = length;
4797                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4798                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
4799                                         return (NULL);
4800                                 } else {
4801                                         return (stcb);
4802                                 }
4803                         } else {
4804                                 return (NULL);
4805                         }
4806                         break;
4807                 case SCTP_SHUTDOWN:
4808                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4809                             (void *)stcb);
4810                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4811                                 break;
4812                         }
4813                         if ((netp != NULL) && (*netp != NULL)) {
4814                                 abort_flag = 0;
4815                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4816                                     stcb, *netp, &abort_flag);
4817                                 if (abort_flag) {
4818                                         *offset = length;
4819                                         return (NULL);
4820                                 }
4821                         }
4822                         break;
4823                 case SCTP_SHUTDOWN_ACK:
4824                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
4825                         if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) &&
4826                             (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4827                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4828                                 *offset = length;
4829                                 return (NULL);
4830                         }
4831                         break;
4832                 case SCTP_OPERATION_ERROR:
4833                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
4834                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
4835                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
4836                                 *offset = length;
4837                                 return (NULL);
4838                         }
4839                         break;
4840                 case SCTP_COOKIE_ECHO:
4841                         SCTPDBG(SCTP_DEBUG_INPUT3,
4842                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
4843                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
4844                                 ;
4845                         } else {
4846                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4847                                         /* We are not interested anymore */
4848                         abend:
4849                                         if (stcb != NULL) {
4850                                                 SCTP_TCB_UNLOCK(stcb);
4851                                         }
4852                                         *offset = length;
4853                                         return (NULL);
4854                                 }
4855                         }
4856                         /*-
4857                          * First are we accepting? We do this again here
4858                          * since it is possible that a previous endpoint WAS
4859                          * listening responded to a INIT-ACK and then
4860                          * closed. We opened and bound.. and are now no
4861                          * longer listening.
4862                          *
4863                          * XXXGL: notes on checking listen queue length.
4864                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
4865                          *    SOLISTENING(), because a listening "UDP type"
4866                          *    socket isn't listening in terms of the socket
4867                          *    layer.  It is a normal data flow socket, that
4868                          *    can fork off new connections.  Thus, we should
4869                          *    look into sol_qlen only in case we are !UDP.
4870                          * 2) Checking sol_qlen in general requires locking
4871                          *    the socket, and this code lacks that.
4872                          */
4873                         if ((stcb == NULL) &&
4874                             (!SCTP_IS_LISTENING(inp) ||
4875                             (((inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) == 0) &&
4876                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
4877                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4878                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4879                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4880                                         sctp_abort_association(inp, stcb, m, iphlen,
4881                                             src, dst, sh, op_err,
4882                                             mflowtype, mflowid,
4883                                             vrf_id, port);
4884                                 }
4885                                 *offset = length;
4886                                 return (NULL);
4887                         } else {
4888                                 struct mbuf *ret_buf;
4889                                 struct sctp_inpcb *linp;
4890                                 struct sctp_tmit_chunk *chk;
4891
4892                                 if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE |
4893                                     SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4894                                         goto abend;
4895                                 }
4896
4897                                 if (stcb) {
4898                                         linp = NULL;
4899                                 } else {
4900                                         linp = inp;
4901                                 }
4902
4903                                 if (linp != NULL) {
4904                                         SCTP_ASOC_CREATE_LOCK(linp);
4905                                 }
4906
4907                                 if (netp != NULL) {
4908                                         struct sctp_tcb *locked_stcb;
4909
4910                                         locked_stcb = stcb;
4911                                         ret_buf =
4912                                             sctp_handle_cookie_echo(m, iphlen,
4913                                             *offset,
4914                                             src, dst,
4915                                             sh,
4916                                             (struct sctp_cookie_echo_chunk *)ch,
4917                                             &inp, &stcb, netp,
4918                                             auth_skipped,
4919                                             auth_offset,
4920                                             auth_len,
4921                                             &locked_stcb,
4922                                             mflowtype,
4923                                             mflowid,
4924                                             vrf_id,
4925                                             port);
4926                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
4927                                                 SCTP_TCB_UNLOCK(locked_stcb);
4928                                         }
4929                                         if (stcb != NULL) {
4930                                                 SCTP_TCB_LOCK_ASSERT(stcb);
4931                                         }
4932                                 } else {
4933                                         ret_buf = NULL;
4934                                 }
4935                                 if (linp != NULL) {
4936                                         SCTP_ASOC_CREATE_UNLOCK(linp);
4937                                 }
4938                                 if (ret_buf == NULL) {
4939                                         if (stcb != NULL) {
4940                                                 SCTP_TCB_UNLOCK(stcb);
4941                                         }
4942                                         SCTPDBG(SCTP_DEBUG_INPUT3,
4943                                             "GAK, null buffer\n");
4944                                         *offset = length;
4945                                         return (NULL);
4946                                 }
4947                                 /* if AUTH skipped, see if it verified... */
4948                                 if (auth_skipped) {
4949                                         got_auth = 1;
4950                                         auth_skipped = 0;
4951                                 }
4952                                 /* Restart the timer if we have pending data */
4953                                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
4954                                         if (chk->whoTo != NULL) {
4955                                                 break;
4956                                         }
4957                                 }
4958                                 if (chk != NULL) {
4959                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
4960                                 }
4961                         }
4962                         break;
4963                 case SCTP_COOKIE_ACK:
4964                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
4965                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
4966                                 break;
4967                         }
4968                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4969                                 /* We are not interested anymore */
4970                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4971                                         ;
4972                                 } else if (stcb) {
4973                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4974                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
4975                                         *offset = length;
4976                                         return (NULL);
4977                                 }
4978                         }
4979                         if ((netp != NULL) && (*netp != NULL)) {
4980                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
4981                         }
4982                         break;
4983                 case SCTP_ECN_ECHO:
4984                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
4985                         if (stcb == NULL) {
4986                                 break;
4987                         }
4988                         if (stcb->asoc.ecn_supported == 0) {
4989                                 goto unknown_chunk;
4990                         }
4991                         if ((chk_length != sizeof(struct sctp_ecne_chunk)) &&
4992                             (chk_length != sizeof(struct old_sctp_ecne_chunk))) {
4993                                 break;
4994                         }
4995                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
4996                         ecne_seen = 1;
4997                         break;
4998                 case SCTP_ECN_CWR:
4999                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5000                         if (stcb == NULL) {
5001                                 break;
5002                         }
5003                         if (stcb->asoc.ecn_supported == 0) {
5004                                 goto unknown_chunk;
5005                         }
5006                         if (chk_length != sizeof(struct sctp_cwr_chunk)) {
5007                                 break;
5008                         }
5009                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5010                         break;
5011                 case SCTP_SHUTDOWN_COMPLETE:
5012                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5013                         /* must be first and only chunk */
5014                         if ((num_chunks > 1) ||
5015                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5016                                 *offset = length;
5017                                 return (stcb);
5018                         }
5019                         if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) &&
5020                             (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5021                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5022                                     stcb, *netp);
5023                                 *offset = length;
5024                                 return (NULL);
5025                         }
5026                         break;
5027                 case SCTP_ASCONF:
5028                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5029                         if (stcb != NULL) {
5030                                 if (stcb->asoc.asconf_supported == 0) {
5031                                         goto unknown_chunk;
5032                                 }
5033                                 sctp_handle_asconf(m, *offset, src,
5034                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5035                                 asconf_cnt++;
5036                         }
5037                         break;
5038                 case SCTP_ASCONF_ACK:
5039                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5040                         if (stcb == NULL) {
5041                                 break;
5042                         }
5043                         if (stcb->asoc.asconf_supported == 0) {
5044                                 goto unknown_chunk;
5045                         }
5046                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5047                                 break;
5048                         }
5049                         if ((netp != NULL) && (*netp != NULL)) {
5050                                 /* He's alive so give him credit */
5051                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5052                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5053                                             stcb->asoc.overall_error_count,
5054                                             0,
5055                                             SCTP_FROM_SCTP_INPUT,
5056                                             __LINE__);
5057                                 }
5058                                 stcb->asoc.overall_error_count = 0;
5059                                 sctp_handle_asconf_ack(m, *offset,
5060                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5061                                 if (abort_no_unlock)
5062                                         return (NULL);
5063                         }
5064                         break;
5065                 case SCTP_FORWARD_CUM_TSN:
5066                 case SCTP_IFORWARD_CUM_TSN:
5067                         SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5068                             ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
5069                         if (stcb == NULL) {
5070                                 break;
5071                         }
5072                         if (stcb->asoc.prsctp_supported == 0) {
5073                                 goto unknown_chunk;
5074                         }
5075                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5076                                 break;
5077                         }
5078                         if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
5079                             ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
5080                                 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
5081                                         SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
5082                                 } else {
5083                                         SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
5084                                 }
5085                                 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5086                                 sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
5087                                 *offset = length;
5088                                 return (NULL);
5089                         }
5090                         *fwd_tsn_seen = 1;
5091                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5092                                 /* We are not interested anymore */
5093                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5094                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5095                                 *offset = length;
5096                                 return (NULL);
5097                         }
5098                         /*
5099                          * For sending a SACK this looks like DATA chunks.
5100                          */
5101                         stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5102                         abort_flag = 0;
5103                         sctp_handle_forward_tsn(stcb,
5104                             (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5105                         if (abort_flag) {
5106                                 *offset = length;
5107                                 return (NULL);
5108                         }
5109                         break;
5110                 case SCTP_STREAM_RESET:
5111                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5112                         if (stcb == NULL) {
5113                                 break;
5114                         }
5115                         if (stcb->asoc.reconfig_supported == 0) {
5116                                 goto unknown_chunk;
5117                         }
5118                         if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) {
5119                                 break;
5120                         }
5121                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5122                                 /* stop processing */
5123                                 *offset = length;
5124                                 return (NULL);
5125                         }
5126                         break;
5127                 case SCTP_PACKET_DROPPED:
5128                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5129                         if (stcb == NULL) {
5130                                 break;
5131                         }
5132                         if (stcb->asoc.pktdrop_supported == 0) {
5133                                 goto unknown_chunk;
5134                         }
5135                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5136                                 break;
5137                         }
5138                         if ((netp != NULL) && (*netp != NULL)) {
5139                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5140                                     stcb, *netp,
5141                                     min(chk_length, contiguous));
5142                         }
5143                         break;
5144                 case SCTP_AUTHENTICATION:
5145                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5146                         if (stcb == NULL) {
5147                                 /* save the first AUTH for later processing */
5148                                 if (auth_skipped == 0) {
5149                                         auth_offset = *offset;
5150                                         auth_len = chk_length;
5151                                         auth_skipped = 1;
5152                                 }
5153                                 /* skip this chunk (temporarily) */
5154                                 break;
5155                         }
5156                         if (stcb->asoc.auth_supported == 0) {
5157                                 goto unknown_chunk;
5158                         }
5159                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5160                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5161                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5162                                 /* Its not ours */
5163                                 *offset = length;
5164                                 return (stcb);
5165                         }
5166                         if (got_auth == 1) {
5167                                 /* skip this chunk... it's already auth'd */
5168                                 break;
5169                         }
5170                         got_auth = 1;
5171                         if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
5172                                 /* auth HMAC failed so dump the packet */
5173                                 *offset = length;
5174                                 return (stcb);
5175                         } else {
5176                                 /* remaining chunks are HMAC checked */
5177                                 stcb->asoc.authenticated = 1;
5178                         }
5179                         break;
5180
5181                 default:
5182         unknown_chunk:
5183                         /* it's an unknown chunk! */
5184                         if ((ch->chunk_type & 0x40) &&
5185                             (stcb != NULL) &&
5186                             (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
5187                             (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
5188                             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5189                                 struct sctp_gen_error_cause *cause;
5190                                 int len;
5191
5192                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5193                                     0, M_NOWAIT, 1, MT_DATA);
5194                                 if (op_err != NULL) {
5195                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5196                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5197                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5198                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5199                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5200                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5201                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5202 #ifdef SCTP_MBUF_LOGGING
5203                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5204                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5205                                                 }
5206 #endif
5207                                                 sctp_queue_op_err(stcb, op_err);
5208                                         } else {
5209                                                 sctp_m_freem(op_err);
5210                                         }
5211                                 }
5212                         }
5213                         if ((ch->chunk_type & 0x80) == 0) {
5214                                 /* discard this packet */
5215                                 *offset = length;
5216                                 return (stcb);
5217                         }       /* else skip this bad chunk and continue... */
5218                         break;
5219                 }               /* switch (ch->chunk_type) */
5220
5221 next_chunk:
5222                 /* get the next chunk */
5223                 *offset += SCTP_SIZE32(chk_length);
5224                 if (*offset >= length) {
5225                         /* no more data left in the mbuf chain */
5226                         break;
5227                 }
5228                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5229                     sizeof(struct sctp_chunkhdr), chunk_buf);
5230                 if (ch == NULL) {
5231                         *offset = length;
5232                         return (stcb);
5233                 }
5234         }                       /* while */
5235
5236         if ((asconf_cnt > 0) && (stcb != NULL)) {
5237                 sctp_send_asconf_ack(stcb);
5238         }
5239         return (stcb);
5240 }
5241
5242 /*
5243  * common input chunk processing (v4 and v6)
5244  */
5245 void
5246 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5247     struct sockaddr *src, struct sockaddr *dst,
5248     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5249     uint8_t compute_crc,
5250     uint8_t ecn_bits,
5251     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5252     uint32_t vrf_id, uint16_t port)
5253 {
5254         char msg[SCTP_DIAG_INFO_LEN];
5255         struct mbuf *m = *mm, *op_err;
5256         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5257         struct sctp_tcb *stcb = NULL;
5258         struct sctp_nets *net = NULL;
5259         uint32_t high_tsn;
5260         uint32_t cksum_in_hdr;
5261         int un_sent;
5262         int cnt_ctrl_ready = 0;
5263         int fwd_tsn_seen = 0, data_processed = 0;
5264         bool cksum_validated, stcb_looked_up;
5265
5266         SCTP_STAT_INCR(sctps_recvdatagrams);
5267 #ifdef SCTP_AUDITING_ENABLED
5268         sctp_audit_log(0xE0, 1);
5269         sctp_auditing(0, inp, stcb, net);
5270 #endif
5271
5272         stcb_looked_up = false;
5273         if (compute_crc != 0) {
5274                 cksum_validated = false;
5275                 cksum_in_hdr = sh->checksum;
5276                 if (cksum_in_hdr != htonl(0)) {
5277                         uint32_t cksum_calculated;
5278
5279         validate_cksum:
5280                         sh->checksum = 0;
5281                         cksum_calculated = sctp_calculate_cksum(m, iphlen);
5282                         sh->checksum = cksum_in_hdr;
5283                         if (cksum_calculated != cksum_in_hdr) {
5284                                 if (stcb_looked_up) {
5285                                         /*
5286                                          * The packet has a zero checksum,
5287                                          * which is not the correct CRC, no
5288                                          * stcb has been found or an stcb
5289                                          * has been found but an incorrect
5290                                          * zero checksum is not acceptable.
5291                                          */
5292                                         KASSERT(cksum_in_hdr == htonl(0),
5293                                             ("cksum in header not zero: %x",
5294                                             ntohl(cksum_in_hdr)));
5295                                         if ((inp == NULL) &&
5296                                             (SCTP_BASE_SYSCTL(sctp_ootb_with_zero_cksum) == 1)) {
5297                                                 /*
5298                                                  * This is an OOTB packet,
5299                                                  * depending on the sysctl
5300                                                  * variable, pretend that
5301                                                  * the checksum is
5302                                                  * acceptable, to allow an
5303                                                  * appropriate response
5304                                                  * (ABORT, for examlpe) to
5305                                                  * be sent.
5306                                                  */
5307                                                 KASSERT(stcb == NULL,
5308                                                     ("stcb is %p", stcb));
5309                                                 SCTP_STAT_INCR(sctps_recvzerocrc);
5310                                                 goto cksum_validated;
5311                                         }
5312                                 } else {
5313                                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5314                                             sh, ch, &inp, &net, vrf_id);
5315                                 }
5316                                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad cksum in SCTP packet:%x calculated:%x m:%p mlen:%d iphlen:%d\n",
5317                                     ntohl(cksum_in_hdr), ntohl(cksum_calculated), (void *)m, length, iphlen);
5318 #if defined(INET) || defined(INET6)
5319                                 if ((ch->chunk_type != SCTP_INITIATION) &&
5320                                     (net != NULL) && (net->port != port)) {
5321                                         if (net->port == 0) {
5322                                                 /*
5323                                                  * UDP encapsulation turned
5324                                                  * on.
5325                                                  */
5326                                                 net->mtu -= sizeof(struct udphdr);
5327                                                 if (stcb->asoc.smallest_mtu > net->mtu) {
5328                                                         sctp_pathmtu_adjustment(stcb, net->mtu, true);
5329                                                 }
5330                                         } else if (port == 0) {
5331                                                 /*
5332                                                  * UDP encapsulation turned
5333                                                  * off.
5334                                                  */
5335                                                 net->mtu += sizeof(struct udphdr);
5336                                                 /* XXX Update smallest_mtu */
5337                                         }
5338                                         net->port = port;
5339                                 }
5340 #endif
5341                                 if (net != NULL) {
5342                                         net->flowtype = mflowtype;
5343                                         net->flowid = mflowid;
5344                                 }
5345                                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5346                                 if ((inp != NULL) && (stcb != NULL)) {
5347                                         if (stcb->asoc.pktdrop_supported) {
5348                                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5349                                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5350                                         }
5351                                 } else if ((inp != NULL) && (stcb == NULL)) {
5352                                         inp_decr = inp;
5353                                 }
5354                                 SCTP_STAT_INCR(sctps_badsum);
5355                                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5356                                 goto out;
5357                         } else {
5358                                 cksum_validated = true;
5359                         }
5360                 }
5361                 KASSERT(cksum_validated || cksum_in_hdr == htonl(0),
5362                     ("cksum 0x%08x not zero and not validated", ntohl(cksum_in_hdr)));
5363                 if (!cksum_validated) {
5364                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5365                             sh, ch, &inp, &net, vrf_id);
5366                         stcb_looked_up = true;
5367                         if (stcb == NULL) {
5368                                 goto validate_cksum;
5369                         }
5370                         if (stcb->asoc.rcv_edmid == SCTP_EDMID_NONE) {
5371                                 goto validate_cksum;
5372                         }
5373                         KASSERT(stcb->asoc.rcv_edmid == SCTP_EDMID_LOWER_LAYER_DTLS,
5374                             ("Unexpected EDMID %u", stcb->asoc.rcv_edmid));
5375                         SCTP_STAT_INCR(sctps_recvzerocrc);
5376                 }
5377         }
5378 cksum_validated:
5379         /* Destination port of 0 is illegal, based on RFC4960. */
5380         if (sh->dest_port == htons(0)) {
5381                 SCTP_STAT_INCR(sctps_hdrops);
5382                 if ((stcb == NULL) && (inp != NULL)) {
5383                         inp_decr = inp;
5384                 }
5385                 goto out;
5386         }
5387         if (!stcb_looked_up) {
5388                 stcb = sctp_findassociation_addr(m, offset, src, dst,
5389                     sh, ch, &inp, &net, vrf_id);
5390         }
5391 #if defined(INET) || defined(INET6)
5392         if ((ch->chunk_type != SCTP_INITIATION) &&
5393             (net != NULL) && (net->port != port)) {
5394                 if (net->port == 0) {
5395                         /* UDP encapsulation turned on. */
5396                         net->mtu -= sizeof(struct udphdr);
5397                         if (stcb->asoc.smallest_mtu > net->mtu) {
5398                                 sctp_pathmtu_adjustment(stcb, net->mtu, true);
5399                         }
5400                 } else if (port == 0) {
5401                         /* UDP encapsulation turned off. */
5402                         net->mtu += sizeof(struct udphdr);
5403                         /* XXX Update smallest_mtu */
5404                 }
5405                 net->port = port;
5406         }
5407 #endif
5408         if (net != NULL) {
5409                 net->flowtype = mflowtype;
5410                 net->flowid = mflowid;
5411         }
5412         if (inp == NULL) {
5413                 SCTP_STAT_INCR(sctps_noport);
5414                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5415                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5416                         goto out;
5417                 }
5418                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5419                         SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
5420                         sctp_send_shutdown_complete2(src, dst, sh,
5421                             mflowtype, mflowid, fibnum,
5422                             vrf_id, port);
5423                         goto out;
5424                 }
5425                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5426                         SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
5427                         goto out;
5428                 }
5429                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5430                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5431                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5432                             (ch->chunk_type != SCTP_INIT))) {
5433                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5434                                     "Out of the blue");
5435                                 sctp_send_abort(m, iphlen, src, dst,
5436                                     sh, 0, op_err,
5437                                     mflowtype, mflowid, fibnum,
5438                                     vrf_id, port);
5439                         }
5440                 }
5441                 goto out;
5442         } else if (stcb == NULL) {
5443                 inp_decr = inp;
5444         }
5445         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5446             (void *)m, iphlen, offset, length, (void *)stcb);
5447         if (stcb) {
5448                 /* always clear this before beginning a packet */
5449                 stcb->asoc.authenticated = 0;
5450                 stcb->asoc.seen_a_sack_this_pkt = 0;
5451                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5452                     (void *)stcb, stcb->asoc.state);
5453
5454                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5455                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5456                         /*-
5457                          * If we hit here, we had a ref count
5458                          * up when the assoc was aborted and the
5459                          * timer is clearing out the assoc, we should
5460                          * NOT respond to any packet.. its OOTB.
5461                          */
5462                         SCTP_TCB_UNLOCK(stcb);
5463                         stcb = NULL;
5464                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5465                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5466                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5467                             msg);
5468                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5469                             mflowtype, mflowid, inp->fibnum,
5470                             vrf_id, port);
5471                         goto out;
5472                 }
5473         }
5474         if (IS_SCTP_CONTROL(ch)) {
5475                 /* process the control portion of the SCTP packet */
5476                 /* sa_ignore NO_NULL_CHK */
5477                 stcb = sctp_process_control(m, iphlen, &offset, length,
5478                     src, dst, sh, ch,
5479                     inp, stcb, &net, &fwd_tsn_seen,
5480                     mflowtype, mflowid, fibnum,
5481                     vrf_id, port);
5482                 if (stcb) {
5483                         /*
5484                          * This covers us if the cookie-echo was there and
5485                          * it changes our INP.
5486                          */
5487                         inp = stcb->sctp_ep;
5488 #if defined(INET) || defined(INET6)
5489                         if ((ch->chunk_type != SCTP_INITIATION) &&
5490                             (net != NULL) && (net->port != port)) {
5491                                 if (net->port == 0) {
5492                                         /* UDP encapsulation turned on. */
5493                                         net->mtu -= sizeof(struct udphdr);
5494                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5495                                                 sctp_pathmtu_adjustment(stcb, net->mtu, true);
5496                                         }
5497                                 } else if (port == 0) {
5498                                         /* UDP encapsulation turned off. */
5499                                         net->mtu += sizeof(struct udphdr);
5500                                         /* XXX Update smallest_mtu */
5501                                 }
5502                                 net->port = port;
5503                         }
5504 #endif
5505                 }
5506         } else {
5507                 /*
5508                  * no control chunks, so pre-process DATA chunks (these
5509                  * checks are taken care of by control processing)
5510                  */
5511
5512                 /*
5513                  * if DATA only packet, and auth is required, then punt...
5514                  * can't have authenticated without any AUTH (control)
5515                  * chunks
5516                  */
5517                 if ((stcb != NULL) &&
5518                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5519                         /* "silently" ignore */
5520                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5521                         SCTP_STAT_INCR(sctps_recvauthmissing);
5522                         goto out;
5523                 }
5524                 if (stcb == NULL) {
5525                         /* out of the blue DATA chunk */
5526                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5527                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5528                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5529                             msg);
5530                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5531                             mflowtype, mflowid, fibnum,
5532                             vrf_id, port);
5533                         goto out;
5534                 }
5535                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5536                         /* v_tag mismatch! */
5537                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5538                         SCTP_STAT_INCR(sctps_badvtag);
5539                         goto out;
5540                 }
5541         }
5542
5543         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5544         if (stcb == NULL) {
5545                 /*
5546                  * no valid TCB for this packet, or we found it's a bad
5547                  * packet while processing control, or we're done with this
5548                  * packet (done or skip rest of data), so we drop it...
5549                  */
5550                 goto out;
5551         }
5552
5553         /*
5554          * DATA chunk processing
5555          */
5556         /* plow through the data chunks while length > offset */
5557
5558         /*
5559          * Rest should be DATA only.  Check authentication state if AUTH for
5560          * DATA is required.
5561          */
5562         if ((length > offset) &&
5563             (stcb != NULL) &&
5564             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5565             !stcb->asoc.authenticated) {
5566                 /* "silently" ignore */
5567                 SCTP_STAT_INCR(sctps_recvauthmissing);
5568                 SCTPDBG(SCTP_DEBUG_AUTH1,
5569                     "Data chunk requires AUTH, skipped\n");
5570                 goto trigger_send;
5571         }
5572         if (length > offset) {
5573                 int retval;
5574
5575                 /*
5576                  * First check to make sure our state is correct. We would
5577                  * not get here unless we really did have a tag, so we don't
5578                  * abort if this happens, just dump the chunk silently.
5579                  */
5580                 switch (SCTP_GET_STATE(stcb)) {
5581                 case SCTP_STATE_COOKIE_ECHOED:
5582                         /*
5583                          * we consider data with valid tags in this state
5584                          * shows us the cookie-ack was lost. Imply it was
5585                          * there.
5586                          */
5587                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5588                         break;
5589                 case SCTP_STATE_COOKIE_WAIT:
5590                         /*
5591                          * We consider OOTB any data sent during asoc setup.
5592                          */
5593                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5594                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5595                             msg);
5596                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5597                             mflowtype, mflowid, inp->fibnum,
5598                             vrf_id, port);
5599                         goto out;
5600                         /* sa_ignore NOTREACHED */
5601                         break;
5602                 case SCTP_STATE_EMPTY:  /* should not happen */
5603                 case SCTP_STATE_INUSE:  /* should not happen */
5604                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5605                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5606                 default:
5607                         goto out;
5608                         /* sa_ignore NOTREACHED */
5609                         break;
5610                 case SCTP_STATE_OPEN:
5611                 case SCTP_STATE_SHUTDOWN_SENT:
5612                         break;
5613                 }
5614                 /* plow through the data chunks while length > offset */
5615                 retval = sctp_process_data(mm, iphlen, &offset, length,
5616                     inp, stcb, net, &high_tsn);
5617                 if (retval == 2) {
5618                         /*
5619                          * The association aborted, NO UNLOCK needed since
5620                          * the association is destroyed.
5621                          */
5622                         stcb = NULL;
5623                         goto out;
5624                 }
5625                 if (retval == 0) {
5626                         data_processed = 1;
5627                 }
5628                 /*
5629                  * Anything important needs to have been m_copy'ed in
5630                  * process_data
5631                  */
5632         }
5633
5634         /* take care of ecn */
5635         if ((data_processed == 1) &&
5636             (stcb->asoc.ecn_supported == 1) &&
5637             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5638                 /* Yep, we need to add a ECNE */
5639                 sctp_send_ecn_echo(stcb, net, high_tsn);
5640         }
5641
5642         if ((data_processed == 0) && (fwd_tsn_seen)) {
5643                 int was_a_gap;
5644                 uint32_t highest_tsn;
5645
5646                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5647                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5648                 } else {
5649                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5650                 }
5651                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5652                 stcb->asoc.send_sack = 1;
5653                 sctp_sack_check(stcb, was_a_gap);
5654         } else if (fwd_tsn_seen) {
5655                 stcb->asoc.send_sack = 1;
5656         }
5657         /* trigger send of any chunks in queue... */
5658 trigger_send:
5659 #ifdef SCTP_AUDITING_ENABLED
5660         sctp_audit_log(0xE0, 2);
5661         sctp_auditing(1, inp, stcb, net);
5662 #endif
5663         SCTPDBG(SCTP_DEBUG_INPUT1,
5664             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5665             stcb->asoc.peers_rwnd,
5666             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5667             stcb->asoc.total_flight);
5668         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5669         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5670                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5671         }
5672         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5673             cnt_ctrl_ready ||
5674             stcb->asoc.trigger_reset ||
5675             ((un_sent > 0) &&
5676             (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
5677                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5678                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5679                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5680         }
5681 #ifdef SCTP_AUDITING_ENABLED
5682         sctp_audit_log(0xE0, 3);
5683         sctp_auditing(2, inp, stcb, net);
5684 #endif
5685 out:
5686         if (stcb != NULL) {
5687                 SCTP_TCB_UNLOCK(stcb);
5688         }
5689         if (inp_decr != NULL) {
5690                 /* reduce ref-count */
5691                 SCTP_INP_WLOCK(inp_decr);
5692                 SCTP_INP_DECR_REF(inp_decr);
5693                 SCTP_INP_WUNLOCK(inp_decr);
5694         }
5695         return;
5696 }
5697
5698 #ifdef INET
5699 void
5700 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5701 {
5702         struct mbuf *m;
5703         int iphlen;
5704         uint32_t vrf_id = 0;
5705         uint8_t ecn_bits;
5706         struct sockaddr_in src, dst;
5707         struct ip *ip;
5708         struct sctphdr *sh;
5709         struct sctp_chunkhdr *ch;
5710         int length, offset;
5711         uint8_t compute_crc;
5712         uint32_t mflowid;
5713         uint8_t mflowtype;
5714         uint16_t fibnum;
5715
5716         iphlen = off;
5717         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5718                 SCTP_RELEASE_PKT(i_pak);
5719                 return;
5720         }
5721         m = SCTP_HEADER_TO_CHAIN(i_pak);
5722 #ifdef SCTP_MBUF_LOGGING
5723         /* Log in any input mbufs */
5724         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5725                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5726         }
5727 #endif
5728 #ifdef SCTP_PACKET_LOGGING
5729         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5730                 sctp_packet_log(m);
5731         }
5732 #endif
5733         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5734             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5735             m->m_pkthdr.len,
5736             if_name(m->m_pkthdr.rcvif),
5737             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5738         mflowid = m->m_pkthdr.flowid;
5739         mflowtype = M_HASHTYPE_GET(m);
5740         fibnum = M_GETFIB(m);
5741         SCTP_STAT_INCR(sctps_recvpackets);
5742         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5743         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5744         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5745         if (SCTP_BUF_LEN(m) < offset) {
5746                 if ((m = m_pullup(m, offset)) == NULL) {
5747                         SCTP_STAT_INCR(sctps_hdrops);
5748                         return;
5749                 }
5750         }
5751         ip = mtod(m, struct ip *);
5752         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5753         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5754         offset -= sizeof(struct sctp_chunkhdr);
5755         memset(&src, 0, sizeof(struct sockaddr_in));
5756         src.sin_family = AF_INET;
5757         src.sin_len = sizeof(struct sockaddr_in);
5758         src.sin_port = sh->src_port;
5759         src.sin_addr = ip->ip_src;
5760         memset(&dst, 0, sizeof(struct sockaddr_in));
5761         dst.sin_family = AF_INET;
5762         dst.sin_len = sizeof(struct sockaddr_in);
5763         dst.sin_port = sh->dest_port;
5764         dst.sin_addr = ip->ip_dst;
5765         length = ntohs(ip->ip_len);
5766         /* Validate mbuf chain length with IP payload length. */
5767         if (SCTP_HEADER_LEN(m) != length) {
5768                 SCTPDBG(SCTP_DEBUG_INPUT1,
5769                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5770                 SCTP_STAT_INCR(sctps_hdrops);
5771                 goto out;
5772         }
5773         /* SCTP does not allow broadcasts or multicasts */
5774         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5775                 goto out;
5776         }
5777         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5778                 goto out;
5779         }
5780         ecn_bits = ip->ip_tos;
5781         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5782                 SCTP_STAT_INCR(sctps_recvhwcrc);
5783                 compute_crc = 0;
5784         } else {
5785                 SCTP_STAT_INCR(sctps_recvswcrc);
5786                 compute_crc = 1;
5787         }
5788         sctp_common_input_processing(&m, iphlen, offset, length,
5789             (struct sockaddr *)&src,
5790             (struct sockaddr *)&dst,
5791             sh, ch,
5792             compute_crc,
5793             ecn_bits,
5794             mflowtype, mflowid, fibnum,
5795             vrf_id, port);
5796 out:
5797         if (m) {
5798                 sctp_m_freem(m);
5799         }
5800         return;
5801 }
5802
5803 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5804 extern int *sctp_cpuarry;
5805 #endif
5806
5807 int
5808 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
5809 {
5810         struct mbuf *m;
5811         int off;
5812
5813         m = *mp;
5814         off = *offp;
5815 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5816         if (mp_ncpus > 1) {
5817                 struct ip *ip;
5818                 struct sctphdr *sh;
5819                 int offset;
5820                 int cpu_to_use;
5821                 uint32_t flowid, tag;
5822
5823                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
5824                         flowid = m->m_pkthdr.flowid;
5825                 } else {
5826                         /*
5827                          * No flow id built by lower layers fix it so we
5828                          * create one.
5829                          */
5830                         offset = off + sizeof(struct sctphdr);
5831                         if (SCTP_BUF_LEN(m) < offset) {
5832                                 if ((m = m_pullup(m, offset)) == NULL) {
5833                                         SCTP_STAT_INCR(sctps_hdrops);
5834                                         return (IPPROTO_DONE);
5835                                 }
5836                         }
5837                         ip = mtod(m, struct ip *);
5838                         sh = (struct sctphdr *)((caddr_t)ip + off);
5839                         tag = htonl(sh->v_tag);
5840                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5841                         m->m_pkthdr.flowid = flowid;
5842                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
5843                 }
5844                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5845                 sctp_queue_to_mcore(m, off, cpu_to_use);
5846                 return (IPPROTO_DONE);
5847         }
5848 #endif
5849         sctp_input_with_port(m, off, 0);
5850         return (IPPROTO_DONE);
5851 }
5852 #endif