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