sys/netinet/sctp_input.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <netinet/sctp_var.h>
  40 #include <netinet/sctp_sysctl.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctputil.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_input.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_bsd_addr.h>
  50 #include <netinet/sctp_timer.h>
  51 #include <netinet/sctp_crc32.h>
  52 #include <netinet/sctp_kdtrace.h>
  53 #if defined(INET) || defined(INET6)
  54 #include <netinet/udp.h>
  55 #endif
  56 #include <sys/smp.h>
  57
  58
  59
  60 static void
  61 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  62 {
  63         struct sctp_nets *net;
  64
  65         /*
  66          * This now not only stops all cookie timers it also stops any INIT
  67          * timers as well. This will make sure that the timers are stopped
  68          * in all collision cases.
  69          */
  70         SCTP_TCB_LOCK_ASSERT(stcb);
  71         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  72                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  73                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  74                             stcb->sctp_ep,
  75                             stcb,
  76                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  77                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  78                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  79                             stcb->sctp_ep,
  80                             stcb,
  81                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  82                 }
  83         }
  84 }
  85
  86 /* INIT handler */
  87 static void
  88 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  89     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  90     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  91     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  92     uint8_t mflowtype, uint32_t mflowid,
  93     uint32_t vrf_id, uint16_t port)
  94 {
  95         struct sctp_init *init;
  96         struct mbuf *op_err;
  97
  98         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  99             (void *)stcb);
 100         if (stcb == NULL) {
 101                 SCTP_INP_RLOCK(inp);
 102         }
 103         /* validate length */
 104         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 105                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 106                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 107                     mflowtype, mflowid,
 108                     vrf_id, port);
 109                 if (stcb)
 110                         *abort_no_unlock = 1;
 111                 goto outnow;
 112         }
 113         /* validate parameters */
 114         init = &cp->init;
 115         if (init->initiate_tag == 0) {
 116                 /* protocol error... send abort */
 117                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 118                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 119                     mflowtype, mflowid,
 120                     vrf_id, port);
 121                 if (stcb)
 122                         *abort_no_unlock = 1;
 123                 goto outnow;
 124         }
 125         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 126                 /* invalid parameter... send abort */
 127                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 128                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 129                     mflowtype, mflowid,
 130                     vrf_id, port);
 131                 if (stcb)
 132                         *abort_no_unlock = 1;
 133                 goto outnow;
 134         }
 135         if (init->num_inbound_streams == 0) {
 136                 /* protocol error... send abort */
 137                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 138                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 139                     mflowtype, mflowid,
 140                     vrf_id, port);
 141                 if (stcb)
 142                         *abort_no_unlock = 1;
 143                 goto outnow;
 144         }
 145         if (init->num_outbound_streams == 0) {
 146                 /* protocol error... send abort */
 147                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 148                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 149                     mflowtype, mflowid,
 150                     vrf_id, port);
 151                 if (stcb)
 152                         *abort_no_unlock = 1;
 153                 goto outnow;
 154         }
 155         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 156             offset + ntohs(cp->ch.chunk_length))) {
 157                 /* auth parameter(s) error... send abort */
 158                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 159                     "Problem with AUTH parameters");
 160                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 161                     mflowtype, mflowid,
 162                     vrf_id, port);
 163                 if (stcb)
 164                         *abort_no_unlock = 1;
 165                 goto outnow;
 166         }
 167         /* We are only accepting if we have a listening socket. */
 168         if ((stcb == NULL) &&
 169             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 170             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 171             (!SCTP_IS_LISTENING(inp)))) {
 172                 /*
 173                  * FIX ME ?? What about TCP model and we have a
 174                  * match/restart case? Actually no fix is needed. the lookup
 175                  * will always find the existing assoc so stcb would not be
 176                  * NULL. It may be questionable to do this since we COULD
 177                  * just send back the INIT-ACK and hope that the app did
 178                  * accept()'s by the time the COOKIE was sent. But there is
 179                  * a price to pay for COOKIE generation and I don't want to
 180                  * pay it on the chance that the app will actually do some
 181                  * accepts(). The App just looses and should NOT be in this
 182                  * state :-)
 183                  */
 184                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 185                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 186                             "No listener");
 187                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 188                             mflowtype, mflowid, inp->fibnum,
 189                             vrf_id, port);
 190                 }
 191                 goto outnow;
 192         }
 193         if ((stcb != NULL) &&
 194             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 195                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 196                 sctp_send_shutdown_ack(stcb, NULL);
 197                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 198         } else {
 199                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 200                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 201                     src, dst, sh, cp,
 202                     mflowtype, mflowid,
 203                     vrf_id, port);
 204         }
 205 outnow:
 206         if (stcb == NULL) {
 207                 SCTP_INP_RUNLOCK(inp);
 208         }
 209 }
 210
 211 /*
 212  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 213  */
 214
 215 int
 216 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 217 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 218     SCTP_UNUSED
 219 #endif
 220 )
 221 {
 222         int unsent_data;
 223         unsigned int i;
 224         struct sctp_stream_queue_pending *sp;
 225         struct sctp_association *asoc;
 226
 227         /*
 228          * This function returns if any stream has true unsent data on it.
 229          * Note that as it looks through it will clean up any places that
 230          * have old data that has been sent but left at top of stream queue.
 231          */
 232         asoc = &stcb->asoc;
 233         unsent_data = 0;
 234         SCTP_TCB_SEND_LOCK(stcb);
 235         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 236                 /* Check to see if some data queued */
 237                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 238                         /* sa_ignore FREED_MEMORY */
 239                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 240                         if (sp == NULL) {
 241                                 continue;
 242                         }
 243                         if ((sp->msg_is_complete) &&
 244                             (sp->length == 0) &&
 245                             (sp->sender_all_done)) {
 246                                 /*
 247                                  * We are doing differed cleanup. Last time
 248                                  * through when we took all the data the
 249                                  * sender_all_done was not set.
 250                                  */
 251                                 if (sp->put_last_out == 0) {
 252                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 253                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 254                                             sp->sender_all_done,
 255                                             sp->length,
 256                                             sp->msg_is_complete,
 257                                             sp->put_last_out);
 258                                 }
 259                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 260                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 261                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
 262                                 if (sp->net) {
 263                                         sctp_free_remote_addr(sp->net);
 264                                         sp->net = NULL;
 265                                 }
 266                                 if (sp->data) {
 267                                         sctp_m_freem(sp->data);
 268                                         sp->data = NULL;
 269                                 }
 270                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 271                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 272                                         unsent_data++;
 273                                 }
 274                         } else {
 275                                 unsent_data++;
 276                         }
 277                         if (unsent_data > 0) {
 278                                 break;
 279                         }
 280                 }
 281         }
 282         SCTP_TCB_SEND_UNLOCK(stcb);
 283         return (unsent_data);
 284 }
 285
 286 static int
 287 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 288 {
 289         struct sctp_init *init;
 290         struct sctp_association *asoc;
 291         struct sctp_nets *lnet;
 292         unsigned int i;
 293
 294         init = &cp->init;
 295         asoc = &stcb->asoc;
 296         /* save off parameters */
 297         asoc->peer_vtag = ntohl(init->initiate_tag);
 298         asoc->peers_rwnd = ntohl(init->a_rwnd);
 299         /* init tsn's */
 300         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 301
 302         if (!TAILQ_EMPTY(&asoc->nets)) {
 303                 /* update any ssthresh's that may have a default */
 304                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 305                         lnet->ssthresh = asoc->peers_rwnd;
 306                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 307                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 308                         }
 309
 310                 }
 311         }
 312         SCTP_TCB_SEND_LOCK(stcb);
 313         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 314                 unsigned int newcnt;
 315                 struct sctp_stream_out *outs;
 316                 struct sctp_stream_queue_pending *sp, *nsp;
 317                 struct sctp_tmit_chunk *chk, *nchk;
 318
 319                 /* abandon the upper streams */
 320                 newcnt = ntohs(init->num_inbound_streams);
 321                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 322                         if (chk->rec.data.sid >= newcnt) {
 323                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 324                                 asoc->send_queue_cnt--;
 325                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 326                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 327 #ifdef INVARIANTS
 328                                 } else {
 329                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 330 #endif
 331                                 }
 332                                 if (chk->data != NULL) {
 333                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 334                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 335                                             0, chk, SCTP_SO_NOT_LOCKED);
 336                                         if (chk->data) {
 337                                                 sctp_m_freem(chk->data);
 338                                                 chk->data = NULL;
 339                                         }
 340                                 }
 341                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 342                                 /* sa_ignore FREED_MEMORY */
 343                         }
 344                 }
 345                 if (asoc->strmout) {
 346                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 347                                 outs = &asoc->strmout[i];
 348                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 349                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 350                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 351                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
 352                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 353                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 354                                         if (sp->data) {
 355                                                 sctp_m_freem(sp->data);
 356                                                 sp->data = NULL;
 357                                         }
 358                                         if (sp->net) {
 359                                                 sctp_free_remote_addr(sp->net);
 360                                                 sp->net = NULL;
 361                                         }
 362                                         /* Free the chunk */
 363                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 364                                         /* sa_ignore FREED_MEMORY */
 365                                 }
 366                                 outs->state = SCTP_STREAM_CLOSED;
 367                         }
 368                 }
 369                 /* cut back the count */
 370                 asoc->pre_open_streams = newcnt;
 371         }
 372         SCTP_TCB_SEND_UNLOCK(stcb);
 373         asoc->streamoutcnt = asoc->pre_open_streams;
 374         if (asoc->strmout) {
 375                 for (i = 0; i < asoc->streamoutcnt; i++) {
 376                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 377                 }
 378         }
 379         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 380         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 381         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 382                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 383         }
 384         /* This is the next one we expect */
 385         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 386
 387         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 388         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 389
 390         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 391         /* open the requested streams */
 392
 393         if (asoc->strmin != NULL) {
 394                 /* Free the old ones */
 395                 for (i = 0; i < asoc->streamincnt; i++) {
 396                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 397                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 398                 }
 399                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 400         }
 401         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 402                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 403         } else {
 404                 asoc->streamincnt = asoc->max_inbound_streams;
 405         }
 406         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 407             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 408         if (asoc->strmin == NULL) {
 409                 /* we didn't get memory for the streams! */
 410                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 411                 return (-1);
 412         }
 413         for (i = 0; i < asoc->streamincnt; i++) {
 414                 asoc->strmin[i].sid = i;
 415                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 416                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 417                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 418                 asoc->strmin[i].pd_api_started = 0;
 419                 asoc->strmin[i].delivery_started = 0;
 420         }
 421         /*
 422          * load_address_from_init will put the addresses into the
 423          * association when the COOKIE is processed or the INIT-ACK is
 424          * processed. Both types of COOKIE's existing and new call this
 425          * routine. It will remove addresses that are no longer in the
 426          * association (for the restarting case where addresses are
 427          * removed). Up front when the INIT arrives we will discard it if it
 428          * is a restart and new addresses have been added.
 429          */
 430         /* sa_ignore MEMLEAK */
 431         return (0);
 432 }
 433
 434 /*
 435  * INIT-ACK message processing/consumption returns value < 0 on error
 436  */
 437 static int
 438 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 439     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 440     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 441     struct sctp_nets *net, int *abort_no_unlock,
 442     uint8_t mflowtype, uint32_t mflowid,
 443     uint32_t vrf_id)
 444 {
 445         struct sctp_association *asoc;
 446         struct mbuf *op_err;
 447         int retval, abort_flag, cookie_found;
 448         int initack_limit;
 449         int nat_friendly = 0;
 450
 451         /* First verify that we have no illegal param's */
 452         abort_flag = 0;
 453         cookie_found = 0;
 454
 455         op_err = sctp_arethere_unrecognized_parameters(m,
 456             (offset + sizeof(struct sctp_init_chunk)),
 457             &abort_flag, (struct sctp_chunkhdr *)cp,
 458             &nat_friendly, &cookie_found);
 459         if (abort_flag) {
 460                 /* Send an abort and notify peer */
 461                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 462                 *abort_no_unlock = 1;
 463                 return (-1);
 464         }
 465         if (!cookie_found) {
 466                 uint16_t len;
 467
 468                 /* Only report the missing cookie parameter */
 469                 if (op_err != NULL) {
 470                         sctp_m_freem(op_err);
 471                 }
 472                 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 473                 /* We abort with an error of missing mandatory param */
 474                 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 475                 if (op_err != NULL) {
 476                         struct sctp_error_missing_param *cause;
 477
 478                         SCTP_BUF_LEN(op_err) = len;
 479                         cause = mtod(op_err, struct sctp_error_missing_param *);
 480                         /* Subtract the reserved param */
 481                         cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 482                         cause->cause.length = htons(len);
 483                         cause->num_missing_params = htonl(1);
 484                         cause->type[0] = htons(SCTP_STATE_COOKIE);
 485                 }
 486                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 487                     src, dst, sh, op_err,
 488                     mflowtype, mflowid,
 489                     vrf_id, net->port);
 490                 *abort_no_unlock = 1;
 491                 return (-3);
 492         }
 493         asoc = &stcb->asoc;
 494         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 495         /* process the peer's parameters in the INIT-ACK */
 496         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 497         if (retval < 0) {
 498                 if (op_err != NULL) {
 499                         sctp_m_freem(op_err);
 500                 }
 501                 return (retval);
 502         }
 503         initack_limit = offset + ntohs(cp->ch.chunk_length);
 504         /* load all addresses */
 505         if ((retval = sctp_load_addresses_from_init(stcb, m,
 506             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 507             src, dst, NULL, stcb->asoc.port))) {
 508                 if (op_err != NULL) {
 509                         sctp_m_freem(op_err);
 510                 }
 511                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 512                     "Problem with address parameters");
 513                 SCTPDBG(SCTP_DEBUG_INPUT1,
 514                     "Load addresses from INIT causes an abort %d\n",
 515                     retval);
 516                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 517                     src, dst, sh, op_err,
 518                     mflowtype, mflowid,
 519                     vrf_id, net->port);
 520                 *abort_no_unlock = 1;
 521                 return (-1);
 522         }
 523         /* if the peer doesn't support asconf, flush the asconf queue */
 524         if (asoc->asconf_supported == 0) {
 525                 struct sctp_asconf_addr *param, *nparam;
 526
 527                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 528                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 529                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 530                 }
 531         }
 532
 533         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 534             stcb->asoc.local_hmacs);
 535         if (op_err) {
 536                 sctp_queue_op_err(stcb, op_err);
 537                 /* queuing will steal away the mbuf chain to the out queue */
 538                 op_err = NULL;
 539         }
 540         /* extract the cookie and queue it to "echo" it back... */
 541         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 542                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 543                     stcb->asoc.overall_error_count,
 544                     0,
 545                     SCTP_FROM_SCTP_INPUT,
 546                     __LINE__);
 547         }
 548         stcb->asoc.overall_error_count = 0;
 549         net->error_count = 0;
 550
 551         /*
 552          * Cancel the INIT timer, We do this first before queueing the
 553          * cookie. We always cancel at the primary to assue that we are
 554          * canceling the timer started by the INIT which always goes to the
 555          * primary.
 556          */
 557         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 558             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 559
 560         /* calculate the RTO */
 561         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 562             SCTP_RTT_FROM_NON_DATA);
 563         retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
 564         return (retval);
 565 }
 566
 567 static void
 568 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 569     struct sctp_tcb *stcb, struct sctp_nets *net)
 570 {
 571         union sctp_sockstore store;
 572         struct sctp_nets *r_net, *f_net;
 573         struct timeval tv;
 574         int req_prim = 0;
 575         uint16_t old_error_counter;
 576
 577         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 578                 /* Invalid length */
 579                 return;
 580         }
 581
 582         memset(&store, 0, sizeof(store));
 583         switch (cp->heartbeat.hb_info.addr_family) {
 584 #ifdef INET
 585         case AF_INET:
 586                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 587                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 588                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 589                         store.sin.sin_port = stcb->rport;
 590                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 591                             sizeof(store.sin.sin_addr));
 592                 } else {
 593                         return;
 594                 }
 595                 break;
 596 #endif
 597 #ifdef INET6
 598         case AF_INET6:
 599                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 600                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 601                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 602                         store.sin6.sin6_port = stcb->rport;
 603                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 604                 } else {
 605                         return;
 606                 }
 607                 break;
 608 #endif
 609         default:
 610                 return;
 611         }
 612         r_net = sctp_findnet(stcb, &store.sa);
 613         if (r_net == NULL) {
 614                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 615                 return;
 616         }
 617         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 618             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 619             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 620                 /*
 621                  * If the its a HB and it's random value is correct when can
 622                  * confirm the destination.
 623                  */
 624                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 625                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 626                         stcb->asoc.primary_destination = r_net;
 627                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 628                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 629                         if (f_net != r_net) {
 630                                 /*
 631                                  * first one on the list is NOT the primary
 632                                  * sctp_cmpaddr() is much more efficient if
 633                                  * the primary is the first on the list,
 634                                  * make it so.
 635                                  */
 636                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 637                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 638                         }
 639                         req_prim = 1;
 640                 }
 641                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 642                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 643                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 644                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 645                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 646         }
 647         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 648                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 649                     stcb->asoc.overall_error_count,
 650                     0,
 651                     SCTP_FROM_SCTP_INPUT,
 652                     __LINE__);
 653         }
 654         stcb->asoc.overall_error_count = 0;
 655         old_error_counter = r_net->error_count;
 656         r_net->error_count = 0;
 657         r_net->hb_responded = 1;
 658         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 659         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 660         /* Now lets do a RTO with this */
 661         sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
 662             SCTP_RTT_FROM_NON_DATA);
 663         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 664                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 665                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 666                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 667         }
 668         if (r_net->dest_state & SCTP_ADDR_PF) {
 669                 r_net->dest_state &= ~SCTP_ADDR_PF;
 670                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 671         }
 672         if (old_error_counter > 0) {
 673                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 674                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 675                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 676         }
 677         if (r_net == stcb->asoc.primary_destination) {
 678                 if (stcb->asoc.alternate) {
 679                         /* release the alternate, primary is good */
 680                         sctp_free_remote_addr(stcb->asoc.alternate);
 681                         stcb->asoc.alternate = NULL;
 682                 }
 683         }
 684         /* Mobility adaptation */
 685         if (req_prim) {
 686                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 687                     SCTP_MOBILITY_BASE) ||
 688                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 689                     SCTP_MOBILITY_FASTHANDOFF)) &&
 690                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 691                     SCTP_MOBILITY_PRIM_DELETED)) {
 692
 693                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 694                             stcb->sctp_ep, stcb, NULL,
 695                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 696                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 697                             SCTP_MOBILITY_FASTHANDOFF)) {
 698                                 sctp_assoc_immediate_retrans(stcb,
 699                                     stcb->asoc.primary_destination);
 700                         }
 701                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 702                             SCTP_MOBILITY_BASE)) {
 703                                 sctp_move_chunks_from_net(stcb,
 704                                     stcb->asoc.deleted_primary);
 705                         }
 706                         sctp_delete_prim_timer(stcb->sctp_ep, stcb);
 707                 }
 708         }
 709 }
 710
 711 static int
 712 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 713 {
 714         /*
 715          * Return 0 means we want you to proceed with the abort non-zero
 716          * means no abort processing.
 717          */
 718         uint32_t new_vtag;
 719         struct sctpasochead *head;
 720
 721         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 722             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 723                 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 724                 atomic_add_int(&stcb->asoc.refcnt, 1);
 725                 SCTP_TCB_UNLOCK(stcb);
 726                 SCTP_INP_INFO_WLOCK();
 727                 SCTP_TCB_LOCK(stcb);
 728                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 729         } else {
 730                 return (0);
 731         }
 732         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
 733                 /* generate a new vtag and send init */
 734                 LIST_REMOVE(stcb, sctp_asocs);
 735                 stcb->asoc.my_vtag = new_vtag;
 736                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 737                 /*
 738                  * put it in the bucket in the vtag hash of assoc's for the
 739                  * system
 740                  */
 741                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 742                 SCTP_INP_INFO_WUNLOCK();
 743                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 744                 return (1);
 745         } else {
 746                 /*
 747                  * treat like a case where the cookie expired i.e.: - dump
 748                  * current cookie. - generate a new vtag. - resend init.
 749                  */
 750                 /* generate a new vtag and send init */
 751                 LIST_REMOVE(stcb, sctp_asocs);
 752                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 753                 sctp_stop_all_cookie_timers(stcb);
 754                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 755                 stcb->asoc.my_vtag = new_vtag;
 756                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 757                 /*
 758                  * put it in the bucket in the vtag hash of assoc's for the
 759                  * system
 760                  */
 761                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 762                 SCTP_INP_INFO_WUNLOCK();
 763                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 764                 return (1);
 765         }
 766         return (0);
 767 }
 768
 769 static int
 770 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 771     struct sctp_nets *net)
 772 {
 773         /*
 774          * return 0 means we want you to proceed with the abort non-zero
 775          * means no abort processing
 776          */
 777         if (stcb->asoc.auth_supported == 0) {
 778                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 779                 return (0);
 780         }
 781         sctp_asconf_send_nat_state_update(stcb, net);
 782         return (1);
 783 }
 784
 785
 786 /* Returns 1 if the stcb was aborted, 0 otherwise */
 787 static int
 788 sctp_handle_abort(struct sctp_abort_chunk *abort,
 789     struct sctp_tcb *stcb, struct sctp_nets *net)
 790 {
 791 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 792         struct socket *so;
 793 #endif
 794         uint16_t len;
 795         uint16_t error;
 796
 797         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 798         if (stcb == NULL)
 799                 return (0);
 800
 801         len = ntohs(abort->ch.chunk_length);
 802         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
 803                 /*
 804                  * Need to check the cause codes for our two magic nat
 805                  * aborts which don't kill the assoc necessarily.
 806                  */
 807                 struct sctp_error_cause *cause;
 808
 809                 cause = (struct sctp_error_cause *)(abort + 1);
 810                 error = ntohs(cause->code);
 811                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 812                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 813                             abort->ch.chunk_flags);
 814                         if (sctp_handle_nat_colliding_state(stcb)) {
 815                                 return (0);
 816                         }
 817                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 818                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 819                             abort->ch.chunk_flags);
 820                         if (sctp_handle_nat_missing_state(stcb, net)) {
 821                                 return (0);
 822                         }
 823                 }
 824         } else {
 825                 error = 0;
 826         }
 827         /* stop any receive timers */
 828         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
 829             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 830         /* notify user of the abort and clean up... */
 831         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 832         /* free the tcb */
 833         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 834         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 835             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 836                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 837         }
 838 #ifdef SCTP_ASOCLOG_OF_TSNS
 839         sctp_print_out_track_log(stcb);
 840 #endif
 841 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 842         so = SCTP_INP_SO(stcb->sctp_ep);
 843         atomic_add_int(&stcb->asoc.refcnt, 1);
 844         SCTP_TCB_UNLOCK(stcb);
 845         SCTP_SOCKET_LOCK(so, 1);
 846         SCTP_TCB_LOCK(stcb);
 847         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 848 #endif
 849         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED);
 850         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 851             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 852 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 853         SCTP_SOCKET_UNLOCK(so, 1);
 854 #endif
 855         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 856         return (1);
 857 }
 858
 859 static void
 860 sctp_start_net_timers(struct sctp_tcb *stcb)
 861 {
 862         uint32_t cnt_hb_sent;
 863         struct sctp_nets *net;
 864
 865         cnt_hb_sent = 0;
 866         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 867                 /*
 868                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 869                  * If the dest in unconfirmed send a hb as well if under
 870                  * max_hb_burst have been sent.
 871                  */
 872                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 873                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 874                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 875                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 876                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 877                         cnt_hb_sent++;
 878                 }
 879         }
 880         if (cnt_hb_sent) {
 881                 sctp_chunk_output(stcb->sctp_ep, stcb,
 882                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 883                     SCTP_SO_NOT_LOCKED);
 884         }
 885 }
 886
 887
 888 static void
 889 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 890     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 891 {
 892         struct sctp_association *asoc;
 893         int some_on_streamwheel;
 894         int old_state;
 895 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 896         struct socket *so;
 897 #endif
 898
 899         SCTPDBG(SCTP_DEBUG_INPUT2,
 900             "sctp_handle_shutdown: handling SHUTDOWN\n");
 901         if (stcb == NULL)
 902                 return;
 903         asoc = &stcb->asoc;
 904         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 905             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 906                 return;
 907         }
 908         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 909                 /* Shutdown NOT the expected size */
 910                 return;
 911         }
 912         old_state = SCTP_GET_STATE(stcb);
 913         sctp_update_acked(stcb, cp, abort_flag);
 914         if (*abort_flag) {
 915                 return;
 916         }
 917         if (asoc->control_pdapi) {
 918                 /*
 919                  * With a normal shutdown we assume the end of last record.
 920                  */
 921                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 922                 if (asoc->control_pdapi->on_strm_q) {
 923                         struct sctp_stream_in *strm;
 924
 925                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 926                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 927                                 /* Unordered */
 928                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 929                                 asoc->control_pdapi->on_strm_q = 0;
 930                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 931                                 /* Ordered */
 932                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 933                                 asoc->control_pdapi->on_strm_q = 0;
 934 #ifdef INVARIANTS
 935                         } else {
 936                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 937                                     asoc->control_pdapi,
 938                                     asoc->control_pdapi->on_strm_q);
 939 #endif
 940                         }
 941                 }
 942                 asoc->control_pdapi->end_added = 1;
 943                 asoc->control_pdapi->pdapi_aborted = 1;
 944                 asoc->control_pdapi = NULL;
 945                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 946 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 947                 so = SCTP_INP_SO(stcb->sctp_ep);
 948                 atomic_add_int(&stcb->asoc.refcnt, 1);
 949                 SCTP_TCB_UNLOCK(stcb);
 950                 SCTP_SOCKET_LOCK(so, 1);
 951                 SCTP_TCB_LOCK(stcb);
 952                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 953                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 954                         /* assoc was freed while we were unlocked */
 955                         SCTP_SOCKET_UNLOCK(so, 1);
 956                         return;
 957                 }
 958 #endif
 959                 if (stcb->sctp_socket) {
 960                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 961                 }
 962 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 963                 SCTP_SOCKET_UNLOCK(so, 1);
 964 #endif
 965         }
 966         /* goto SHUTDOWN_RECEIVED state to block new requests */
 967         if (stcb->sctp_socket) {
 968                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 969                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 970                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
 971                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
 972                         /*
 973                          * notify upper layer that peer has initiated a
 974                          * shutdown
 975                          */
 976                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 977
 978                         /* reset time */
 979                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 980                 }
 981         }
 982         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
 983                 /*
 984                  * stop the shutdown timer, since we WILL move to
 985                  * SHUTDOWN-ACK-SENT.
 986                  */
 987                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 988                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 989         }
 990         /* Now is there unsent data on a stream somewhere? */
 991         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 992
 993         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 994             !TAILQ_EMPTY(&asoc->sent_queue) ||
 995             some_on_streamwheel) {
 996                 /* By returning we will push more data out */
 997                 return;
 998         } else {
 999                 /* no outstanding data to send, so move on... */
1000                 /* send SHUTDOWN-ACK */
1001                 /* move to SHUTDOWN-ACK-SENT state */
1002                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
1003                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1004                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1005                 }
1006                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
1007                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
1008                         sctp_stop_timers_for_shutdown(stcb);
1009                         sctp_send_shutdown_ack(stcb, net);
1010                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
1011                             stcb->sctp_ep, stcb, net);
1012                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1013                         sctp_send_shutdown_ack(stcb, net);
1014                 }
1015         }
1016 }
1017
1018 static void
1019 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
1020     struct sctp_tcb *stcb,
1021     struct sctp_nets *net)
1022 {
1023         struct sctp_association *asoc;
1024 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1025         struct socket *so;
1026
1027         so = SCTP_INP_SO(stcb->sctp_ep);
1028 #endif
1029         SCTPDBG(SCTP_DEBUG_INPUT2,
1030             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1031         if (stcb == NULL)
1032                 return;
1033
1034         asoc = &stcb->asoc;
1035         /* process according to association state */
1036         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1037             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1038                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1039                 sctp_send_shutdown_complete(stcb, net, 1);
1040                 SCTP_TCB_UNLOCK(stcb);
1041                 return;
1042         }
1043         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
1044             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1045                 /* unexpected SHUTDOWN-ACK... so ignore... */
1046                 SCTP_TCB_UNLOCK(stcb);
1047                 return;
1048         }
1049         if (asoc->control_pdapi) {
1050                 /*
1051                  * With a normal shutdown we assume the end of last record.
1052                  */
1053                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1054                 asoc->control_pdapi->end_added = 1;
1055                 asoc->control_pdapi->pdapi_aborted = 1;
1056                 asoc->control_pdapi = NULL;
1057                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1058 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1059                 atomic_add_int(&stcb->asoc.refcnt, 1);
1060                 SCTP_TCB_UNLOCK(stcb);
1061                 SCTP_SOCKET_LOCK(so, 1);
1062                 SCTP_TCB_LOCK(stcb);
1063                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1064                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1065                         /* assoc was freed while we were unlocked */
1066                         SCTP_SOCKET_UNLOCK(so, 1);
1067                         return;
1068                 }
1069 #endif
1070                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1071 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1072                 SCTP_SOCKET_UNLOCK(so, 1);
1073 #endif
1074         }
1075 #ifdef INVARIANTS
1076         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1077             !TAILQ_EMPTY(&asoc->sent_queue) ||
1078             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
1079                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1080         }
1081 #endif
1082         /* stop the timer */
1083         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1084             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1085         /* send SHUTDOWN-COMPLETE */
1086         sctp_send_shutdown_complete(stcb, net, 0);
1087         /* notify upper layer protocol */
1088         if (stcb->sctp_socket) {
1089                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1090                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1091                         stcb->sctp_socket->so_snd.sb_cc = 0;
1092                 }
1093                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1094         }
1095         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1096         /* free the TCB but first save off the ep */
1097 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1098         atomic_add_int(&stcb->asoc.refcnt, 1);
1099         SCTP_TCB_UNLOCK(stcb);
1100         SCTP_SOCKET_LOCK(so, 1);
1101         SCTP_TCB_LOCK(stcb);
1102         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1103 #endif
1104         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1105             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1106 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1107         SCTP_SOCKET_UNLOCK(so, 1);
1108 #endif
1109 }
1110
1111 static void
1112 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
1113 {
1114         switch (chunk_type) {
1115         case SCTP_ASCONF_ACK:
1116         case SCTP_ASCONF:
1117                 sctp_asconf_cleanup(stcb);
1118                 break;
1119         case SCTP_IFORWARD_CUM_TSN:
1120         case SCTP_FORWARD_CUM_TSN:
1121                 stcb->asoc.prsctp_supported = 0;
1122                 break;
1123         default:
1124                 SCTPDBG(SCTP_DEBUG_INPUT2,
1125                     "Peer does not support chunk type %d (0x%x).\n",
1126                     chunk_type, chunk_type);
1127                 break;
1128         }
1129 }
1130
1131 /*
1132  * Skip past the param header and then we will find the param that caused the
1133  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1134  * these will turn of specific features.
1135  * XXX: Is this the right thing to do?
1136  */
1137 static void
1138 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1139 {
1140         switch (parameter_type) {
1141                 /* pr-sctp draft */
1142         case SCTP_PRSCTP_SUPPORTED:
1143                 stcb->asoc.prsctp_supported = 0;
1144                 break;
1145         case SCTP_SUPPORTED_CHUNK_EXT:
1146                 break;
1147                 /* draft-ietf-tsvwg-addip-sctp */
1148         case SCTP_HAS_NAT_SUPPORT:
1149                 stcb->asoc.peer_supports_nat = 0;
1150                 break;
1151         case SCTP_ADD_IP_ADDRESS:
1152         case SCTP_DEL_IP_ADDRESS:
1153         case SCTP_SET_PRIM_ADDR:
1154                 stcb->asoc.asconf_supported = 0;
1155                 break;
1156         case SCTP_SUCCESS_REPORT:
1157         case SCTP_ERROR_CAUSE_IND:
1158                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1159                 SCTPDBG(SCTP_DEBUG_INPUT2,
1160                     "Turning off ASCONF to this strange peer\n");
1161                 stcb->asoc.asconf_supported = 0;
1162                 break;
1163         default:
1164                 SCTPDBG(SCTP_DEBUG_INPUT2,
1165                     "Peer does not support param type %d (0x%x)??\n",
1166                     parameter_type, parameter_type);
1167                 break;
1168         }
1169 }
1170
1171 static int
1172 sctp_handle_error(struct sctp_chunkhdr *ch,
1173     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1174 {
1175         struct sctp_error_cause *cause;
1176         struct sctp_association *asoc;
1177         uint32_t remaining_length, adjust;
1178         uint16_t code, cause_code, cause_length;
1179 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1180         struct socket *so;
1181 #endif
1182
1183         /* parse through all of the errors and process */
1184         asoc = &stcb->asoc;
1185         cause = (struct sctp_error_cause *)((caddr_t)ch +
1186             sizeof(struct sctp_chunkhdr));
1187         remaining_length = ntohs(ch->chunk_length);
1188         if (remaining_length > limit) {
1189                 remaining_length = limit;
1190         }
1191         if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1192                 remaining_length -= sizeof(struct sctp_chunkhdr);
1193         } else {
1194                 remaining_length = 0;
1195         }
1196         code = 0;
1197         while (remaining_length >= sizeof(struct sctp_error_cause)) {
1198                 /* Process an Error Cause */
1199                 cause_code = ntohs(cause->code);
1200                 cause_length = ntohs(cause->length);
1201                 if ((cause_length > remaining_length) || (cause_length == 0)) {
1202                         /* Invalid cause length, possibly due to truncation. */
1203                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1204                             remaining_length, cause_length);
1205                         return (0);
1206                 }
1207                 if (code == 0) {
1208                         /* report the first error cause */
1209                         code = cause_code;
1210                 }
1211                 switch (cause_code) {
1212                 case SCTP_CAUSE_INVALID_STREAM:
1213                 case SCTP_CAUSE_MISSING_PARAM:
1214                 case SCTP_CAUSE_INVALID_PARAM:
1215                 case SCTP_CAUSE_NO_USER_DATA:
1216                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1217                             cause_code);
1218                         break;
1219                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1220                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n",
1221                             ch->chunk_flags);
1222                         if (sctp_handle_nat_colliding_state(stcb)) {
1223                                 return (0);
1224                         }
1225                         break;
1226                 case SCTP_CAUSE_NAT_MISSING_STATE:
1227                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n",
1228                             ch->chunk_flags);
1229                         if (sctp_handle_nat_missing_state(stcb, net)) {
1230                                 return (0);
1231                         }
1232                         break;
1233                 case SCTP_CAUSE_STALE_COOKIE:
1234                         /*
1235                          * We only act if we have echoed a cookie and are
1236                          * waiting.
1237                          */
1238                         if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1239                             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1240                                 struct sctp_error_stale_cookie *stale_cookie;
1241
1242                                 stale_cookie = (struct sctp_error_stale_cookie *)cause;
1243                                 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time);
1244                                 /* Double it to be more robust on RTX */
1245                                 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) {
1246                                         asoc->cookie_preserve_req *= 2;
1247                                 } else {
1248                                         asoc->cookie_preserve_req = UINT32_MAX;
1249                                 }
1250                                 asoc->stale_cookie_count++;
1251                                 if (asoc->stale_cookie_count >
1252                                     asoc->max_init_times) {
1253                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1254                                         /* now free the asoc */
1255 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1256                                         so = SCTP_INP_SO(stcb->sctp_ep);
1257                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1258                                         SCTP_TCB_UNLOCK(stcb);
1259                                         SCTP_SOCKET_LOCK(so, 1);
1260                                         SCTP_TCB_LOCK(stcb);
1261                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1262 #endif
1263                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1264                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1265 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1266                                         SCTP_SOCKET_UNLOCK(so, 1);
1267 #endif
1268                                         return (-1);
1269                                 }
1270                                 /* blast back to INIT state */
1271                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1272                                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1273                                 sctp_stop_all_cookie_timers(stcb);
1274                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1275                         }
1276                         break;
1277                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1278                         /*
1279                          * Nothing we can do here, we don't do hostname
1280                          * addresses so if the peer does not like my IPv6
1281                          * (or IPv4 for that matter) it does not matter. If
1282                          * they don't support that type of address, they can
1283                          * NOT possibly get that packet type... i.e. with no
1284                          * IPv6 you can't receive a IPv6 packet. so we can
1285                          * safely ignore this one. If we ever added support
1286                          * for HOSTNAME Addresses, then we would need to do
1287                          * something here.
1288                          */
1289                         break;
1290                 case SCTP_CAUSE_UNRECOG_CHUNK:
1291                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1292                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
1293
1294                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1295                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
1296                         }
1297                         break;
1298                 case SCTP_CAUSE_UNRECOG_PARAM:
1299                         /* XXX: We only consider the first parameter */
1300                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1301                                 struct sctp_paramhdr *unrec_parameter;
1302
1303                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1304                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1305                         }
1306                         break;
1307                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1308                         /*
1309                          * We ignore this since the timer will drive out a
1310                          * new cookie anyway and there timer will drive us
1311                          * to send a SHUTDOWN_COMPLETE. We can't send one
1312                          * here since we don't have their tag.
1313                          */
1314                         break;
1315                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1316                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1317                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1318                         /*
1319                          * We should NOT get these here, but in a
1320                          * ASCONF-ACK.
1321                          */
1322                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1323                             cause_code);
1324                         break;
1325                 case SCTP_CAUSE_OUT_OF_RESC:
1326                         /*
1327                          * And what, pray tell do we do with the fact that
1328                          * the peer is out of resources? Not really sure we
1329                          * could do anything but abort. I suspect this
1330                          * should have came WITH an abort instead of in a
1331                          * OP-ERROR.
1332                          */
1333                         break;
1334                 default:
1335                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1336                             cause_code);
1337                         break;
1338                 }
1339                 adjust = SCTP_SIZE32(cause_length);
1340                 if (remaining_length >= adjust) {
1341                         remaining_length -= adjust;
1342                 } else {
1343                         remaining_length = 0;
1344                 }
1345                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1346         }
1347         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1348         return (0);
1349 }
1350
1351 static int
1352 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1353     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1354     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1355     struct sctp_nets *net, int *abort_no_unlock,
1356     uint8_t mflowtype, uint32_t mflowid,
1357     uint32_t vrf_id)
1358 {
1359         struct sctp_init_ack *init_ack;
1360         struct mbuf *op_err;
1361
1362         SCTPDBG(SCTP_DEBUG_INPUT2,
1363             "sctp_handle_init_ack: handling INIT-ACK\n");
1364
1365         if (stcb == NULL) {
1366                 SCTPDBG(SCTP_DEBUG_INPUT2,
1367                     "sctp_handle_init_ack: TCB is null\n");
1368                 return (-1);
1369         }
1370         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1371                 /* Invalid length */
1372                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1373                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1374                     src, dst, sh, op_err,
1375                     mflowtype, mflowid,
1376                     vrf_id, net->port);
1377                 *abort_no_unlock = 1;
1378                 return (-1);
1379         }
1380         init_ack = &cp->init;
1381         /* validate parameters */
1382         if (init_ack->initiate_tag == 0) {
1383                 /* protocol error... send an abort */
1384                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1385                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1386                     src, dst, sh, op_err,
1387                     mflowtype, mflowid,
1388                     vrf_id, net->port);
1389                 *abort_no_unlock = 1;
1390                 return (-1);
1391         }
1392         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1393                 /* protocol error... send an abort */
1394                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1395                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1396                     src, dst, sh, op_err,
1397                     mflowtype, mflowid,
1398                     vrf_id, net->port);
1399                 *abort_no_unlock = 1;
1400                 return (-1);
1401         }
1402         if (init_ack->num_inbound_streams == 0) {
1403                 /* protocol error... send an abort */
1404                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1405                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1406                     src, dst, sh, op_err,
1407                     mflowtype, mflowid,
1408                     vrf_id, net->port);
1409                 *abort_no_unlock = 1;
1410                 return (-1);
1411         }
1412         if (init_ack->num_outbound_streams == 0) {
1413                 /* protocol error... send an abort */
1414                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1415                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1416                     src, dst, sh, op_err,
1417                     mflowtype, mflowid,
1418                     vrf_id, net->port);
1419                 *abort_no_unlock = 1;
1420                 return (-1);
1421         }
1422         /* process according to association state... */
1423         switch (SCTP_GET_STATE(stcb)) {
1424         case SCTP_STATE_COOKIE_WAIT:
1425                 /* this is the expected state for this chunk */
1426                 /* process the INIT-ACK parameters */
1427                 if (stcb->asoc.primary_destination->dest_state &
1428                     SCTP_ADDR_UNCONFIRMED) {
1429                         /*
1430                          * The primary is where we sent the INIT, we can
1431                          * always consider it confirmed when the INIT-ACK is
1432                          * returned. Do this before we load addresses
1433                          * though.
1434                          */
1435                         stcb->asoc.primary_destination->dest_state &=
1436                             ~SCTP_ADDR_UNCONFIRMED;
1437                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1438                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1439                 }
1440                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1441                     net, abort_no_unlock,
1442                     mflowtype, mflowid,
1443                     vrf_id) < 0) {
1444                         /* error in parsing parameters */
1445                         return (-1);
1446                 }
1447                 /* update our state */
1448                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1449                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1450
1451                 /* reset the RTO calc */
1452                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1453                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1454                             stcb->asoc.overall_error_count,
1455                             0,
1456                             SCTP_FROM_SCTP_INPUT,
1457                             __LINE__);
1458                 }
1459                 stcb->asoc.overall_error_count = 0;
1460                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1461                 /*
1462                  * collapse the init timer back in case of a exponential
1463                  * backoff
1464                  */
1465                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1466                     stcb, net);
1467                 /*
1468                  * the send at the end of the inbound data processing will
1469                  * cause the cookie to be sent
1470                  */
1471                 break;
1472         case SCTP_STATE_SHUTDOWN_SENT:
1473                 /* incorrect state... discard */
1474                 break;
1475         case SCTP_STATE_COOKIE_ECHOED:
1476                 /* incorrect state... discard */
1477                 break;
1478         case SCTP_STATE_OPEN:
1479                 /* incorrect state... discard */
1480                 break;
1481         case SCTP_STATE_EMPTY:
1482         case SCTP_STATE_INUSE:
1483         default:
1484                 /* incorrect state... discard */
1485                 return (-1);
1486                 break;
1487         }
1488         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1489         return (0);
1490 }
1491
1492 static struct sctp_tcb *
1493 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1494     struct sockaddr *src, struct sockaddr *dst,
1495     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1496     struct sctp_inpcb *inp, struct sctp_nets **netp,
1497     struct sockaddr *init_src, int *notification,
1498     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1499     uint8_t mflowtype, uint32_t mflowid,
1500     uint32_t vrf_id, uint16_t port);
1501
1502
1503 /*
1504  * handle a state cookie for an existing association m: input packet mbuf
1505  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1506  * "split" mbuf and the cookie signature does not exist offset: offset into
1507  * mbuf to the cookie-echo chunk
1508  */
1509 static struct sctp_tcb *
1510 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1511     struct sockaddr *src, struct sockaddr *dst,
1512     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1513     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1514     struct sockaddr *init_src, int *notification,
1515     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1516     uint8_t mflowtype, uint32_t mflowid,
1517     uint32_t vrf_id, uint16_t port)
1518 {
1519         struct sctp_association *asoc;
1520         struct sctp_init_chunk *init_cp, init_buf;
1521         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1522         struct sctp_nets *net;
1523         struct mbuf *op_err;
1524         struct timeval old;
1525         int init_offset, initack_offset, i;
1526         int retval;
1527         int spec_flag = 0;
1528         uint32_t how_indx;
1529 #if defined(SCTP_DETAILED_STR_STATS)
1530         int j;
1531 #endif
1532
1533         net = *netp;
1534         /* I know that the TCB is non-NULL from the caller */
1535         asoc = &stcb->asoc;
1536         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1537                 if (asoc->cookie_how[how_indx] == 0)
1538                         break;
1539         }
1540         if (how_indx < sizeof(asoc->cookie_how)) {
1541                 asoc->cookie_how[how_indx] = 1;
1542         }
1543         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1544                 /* SHUTDOWN came in after sending INIT-ACK */
1545                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1546                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1547                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1548                     mflowtype, mflowid, inp->fibnum,
1549                     vrf_id, net->port);
1550                 if (how_indx < sizeof(asoc->cookie_how))
1551                         asoc->cookie_how[how_indx] = 2;
1552                 return (NULL);
1553         }
1554         /*
1555          * find and validate the INIT chunk in the cookie (peer's info) the
1556          * INIT should start after the cookie-echo header struct (chunk
1557          * header, state cookie header struct)
1558          */
1559         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1560
1561         init_cp = (struct sctp_init_chunk *)
1562             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1563             (uint8_t *)&init_buf);
1564         if (init_cp == NULL) {
1565                 /* could not pull a INIT chunk in cookie */
1566                 return (NULL);
1567         }
1568         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1569                 return (NULL);
1570         }
1571         /*
1572          * find and validate the INIT-ACK chunk in the cookie (my info) the
1573          * INIT-ACK follows the INIT chunk
1574          */
1575         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1576         initack_cp = (struct sctp_init_ack_chunk *)
1577             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1578             (uint8_t *)&initack_buf);
1579         if (initack_cp == NULL) {
1580                 /* could not pull INIT-ACK chunk in cookie */
1581                 return (NULL);
1582         }
1583         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1584                 return (NULL);
1585         }
1586         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1587             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1588                 /*
1589                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1590                  * to get into the OPEN state
1591                  */
1592                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1593                         /*-
1594                          * Opps, this means that we somehow generated two vtag's
1595                          * the same. I.e. we did:
1596                          *  Us               Peer
1597                          *   <---INIT(tag=a)------
1598                          *   ----INIT-ACK(tag=t)-->
1599                          *   ----INIT(tag=t)------> *1
1600                          *   <---INIT-ACK(tag=a)---
1601                          *   <----CE(tag=t)------------- *2
1602                          *
1603                          * At point *1 we should be generating a different
1604                          * tag t'. Which means we would throw away the CE and send
1605                          * ours instead. Basically this is case C (throw away side).
1606                          */
1607                         if (how_indx < sizeof(asoc->cookie_how))
1608                                 asoc->cookie_how[how_indx] = 17;
1609                         return (NULL);
1610
1611                 }
1612                 switch (SCTP_GET_STATE(stcb)) {
1613                 case SCTP_STATE_COOKIE_WAIT:
1614                 case SCTP_STATE_COOKIE_ECHOED:
1615                         /*
1616                          * INIT was sent but got a COOKIE_ECHO with the
1617                          * correct tags... just accept it...but we must
1618                          * process the init so that we can make sure we have
1619                          * the right seq no's.
1620                          */
1621                         /* First we must process the INIT !! */
1622                         retval = sctp_process_init(init_cp, stcb);
1623                         if (retval < 0) {
1624                                 if (how_indx < sizeof(asoc->cookie_how))
1625                                         asoc->cookie_how[how_indx] = 3;
1626                                 return (NULL);
1627                         }
1628                         /* we have already processed the INIT so no problem */
1629                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1630                             stcb, net,
1631                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1632                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1633                             stcb, net,
1634                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1635                         /* update current state */
1636                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1637                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1638                         else
1639                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1640
1641                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1642                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1643                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1644                                     stcb->sctp_ep, stcb, NULL);
1645                         }
1646                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1647                         sctp_stop_all_cookie_timers(stcb);
1648                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1649                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1650                             (!SCTP_IS_LISTENING(inp))) {
1651 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1652                                 struct socket *so;
1653 #endif
1654                                 /*
1655                                  * Here is where collision would go if we
1656                                  * did a connect() and instead got a
1657                                  * init/init-ack/cookie done before the
1658                                  * init-ack came back..
1659                                  */
1660                                 stcb->sctp_ep->sctp_flags |=
1661                                     SCTP_PCB_FLAGS_CONNECTED;
1662 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1663                                 so = SCTP_INP_SO(stcb->sctp_ep);
1664                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1665                                 SCTP_TCB_UNLOCK(stcb);
1666                                 SCTP_SOCKET_LOCK(so, 1);
1667                                 SCTP_TCB_LOCK(stcb);
1668                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1669                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1670                                         SCTP_SOCKET_UNLOCK(so, 1);
1671                                         return (NULL);
1672                                 }
1673 #endif
1674                                 soisconnected(stcb->sctp_socket);
1675 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1676                                 SCTP_SOCKET_UNLOCK(so, 1);
1677 #endif
1678                         }
1679                         /* notify upper layer */
1680                         *notification = SCTP_NOTIFY_ASSOC_UP;
1681                         /*
1682                          * since we did not send a HB make sure we don't
1683                          * double things
1684                          */
1685                         old.tv_sec = cookie->time_entered.tv_sec;
1686                         old.tv_usec = cookie->time_entered.tv_usec;
1687                         net->hb_responded = 1;
1688                         sctp_calculate_rto(stcb, asoc, net, &old,
1689                             SCTP_RTT_FROM_NON_DATA);
1690
1691                         if (stcb->asoc.sctp_autoclose_ticks &&
1692                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1693                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1694                                     inp, stcb, NULL);
1695                         }
1696                         break;
1697                 default:
1698                         /*
1699                          * we're in the OPEN state (or beyond), so peer must
1700                          * have simply lost the COOKIE-ACK
1701                          */
1702                         break;
1703                 }               /* end switch */
1704                 sctp_stop_all_cookie_timers(stcb);
1705                 /*
1706                  * We ignore the return code here.. not sure if we should
1707                  * somehow abort.. but we do have an existing asoc. This
1708                  * really should not fail.
1709                  */
1710                 if (sctp_load_addresses_from_init(stcb, m,
1711                     init_offset + sizeof(struct sctp_init_chunk),
1712                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1713                         if (how_indx < sizeof(asoc->cookie_how))
1714                                 asoc->cookie_how[how_indx] = 4;
1715                         return (NULL);
1716                 }
1717                 /* respond with a COOKIE-ACK */
1718                 sctp_toss_old_cookies(stcb, asoc);
1719                 sctp_send_cookie_ack(stcb);
1720                 if (how_indx < sizeof(asoc->cookie_how))
1721                         asoc->cookie_how[how_indx] = 5;
1722                 return (stcb);
1723         }
1724
1725         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1726             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1727             cookie->tie_tag_my_vtag == 0 &&
1728             cookie->tie_tag_peer_vtag == 0) {
1729                 /*
1730                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1731                  */
1732                 if (how_indx < sizeof(asoc->cookie_how))
1733                         asoc->cookie_how[how_indx] = 6;
1734                 return (NULL);
1735         }
1736         /*
1737          * If nat support, and the below and stcb is established, send back
1738          * a ABORT(colliding state) if we are established.
1739          */
1740         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1741             (asoc->peer_supports_nat) &&
1742             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1743             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1744             (asoc->peer_vtag == 0)))) {
1745                 /*
1746                  * Special case - Peer's support nat. We may have two init's
1747                  * that we gave out the same tag on since one was not
1748                  * established.. i.e. we get INIT from host-1 behind the nat
1749                  * and we respond tag-a, we get a INIT from host-2 behind
1750                  * the nat and we get tag-a again. Then we bring up host-1
1751                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1752                  * Now we have colliding state. We must send an abort here
1753                  * with colliding state indication.
1754                  */
1755                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1756                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1757                     mflowtype, mflowid, inp->fibnum,
1758                     vrf_id, port);
1759                 return (NULL);
1760         }
1761         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1762             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1763             (asoc->peer_vtag == 0))) {
1764                 /*
1765                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1766                  * should be ok, re-accept peer info
1767                  */
1768                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1769                         /*
1770                          * Extension of case C. If we hit this, then the
1771                          * random number generator returned the same vtag
1772                          * when we first sent our INIT-ACK and when we later
1773                          * sent our INIT. The side with the seq numbers that
1774                          * are different will be the one that normnally
1775                          * would have hit case C. This in effect "extends"
1776                          * our vtags in this collision case to be 64 bits.
1777                          * The same collision could occur aka you get both
1778                          * vtag and seq number the same twice in a row.. but
1779                          * is much less likely. If it did happen then we
1780                          * would proceed through and bring up the assoc.. we
1781                          * may end up with the wrong stream setup however..
1782                          * which would be bad.. but there is no way to
1783                          * tell.. until we send on a stream that does not
1784                          * exist :-)
1785                          */
1786                         if (how_indx < sizeof(asoc->cookie_how))
1787                                 asoc->cookie_how[how_indx] = 7;
1788
1789                         return (NULL);
1790                 }
1791                 if (how_indx < sizeof(asoc->cookie_how))
1792                         asoc->cookie_how[how_indx] = 8;
1793                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1794                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1795                 sctp_stop_all_cookie_timers(stcb);
1796                 /*
1797                  * since we did not send a HB make sure we don't double
1798                  * things
1799                  */
1800                 net->hb_responded = 1;
1801                 if (stcb->asoc.sctp_autoclose_ticks &&
1802                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1803                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1804                             NULL);
1805                 }
1806                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1807                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1808
1809                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1810                         /*
1811                          * Ok the peer probably discarded our data (if we
1812                          * echoed a cookie+data). So anything on the
1813                          * sent_queue should be marked for retransmit, we
1814                          * may not get something to kick us so it COULD
1815                          * still take a timeout to move these.. but it can't
1816                          * hurt to mark them.
1817                          */
1818                         struct sctp_tmit_chunk *chk;
1819
1820                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1821                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1822                                         chk->sent = SCTP_DATAGRAM_RESEND;
1823                                         sctp_flight_size_decrease(chk);
1824                                         sctp_total_flight_decrease(stcb, chk);
1825                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1826                                         spec_flag++;
1827                                 }
1828                         }
1829
1830                 }
1831                 /* process the INIT info (peer's info) */
1832                 retval = sctp_process_init(init_cp, stcb);
1833                 if (retval < 0) {
1834                         if (how_indx < sizeof(asoc->cookie_how))
1835                                 asoc->cookie_how[how_indx] = 9;
1836                         return (NULL);
1837                 }
1838                 if (sctp_load_addresses_from_init(stcb, m,
1839                     init_offset + sizeof(struct sctp_init_chunk),
1840                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1841                         if (how_indx < sizeof(asoc->cookie_how))
1842                                 asoc->cookie_how[how_indx] = 10;
1843                         return (NULL);
1844                 }
1845                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1846                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1847                         *notification = SCTP_NOTIFY_ASSOC_UP;
1848
1849                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1850                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1851                             (!SCTP_IS_LISTENING(inp))) {
1852 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1853                                 struct socket *so;
1854 #endif
1855                                 stcb->sctp_ep->sctp_flags |=
1856                                     SCTP_PCB_FLAGS_CONNECTED;
1857 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1858                                 so = SCTP_INP_SO(stcb->sctp_ep);
1859                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1860                                 SCTP_TCB_UNLOCK(stcb);
1861                                 SCTP_SOCKET_LOCK(so, 1);
1862                                 SCTP_TCB_LOCK(stcb);
1863                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1864                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1865                                         SCTP_SOCKET_UNLOCK(so, 1);
1866                                         return (NULL);
1867                                 }
1868 #endif
1869                                 soisconnected(stcb->sctp_socket);
1870 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1871                                 SCTP_SOCKET_UNLOCK(so, 1);
1872 #endif
1873                         }
1874                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1875                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1876                         else
1877                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1878                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1879                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1880                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1881                 } else {
1882                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1883                 }
1884                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1885                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1886                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1887                             stcb->sctp_ep, stcb, NULL);
1888                 }
1889                 sctp_stop_all_cookie_timers(stcb);
1890                 sctp_toss_old_cookies(stcb, asoc);
1891                 sctp_send_cookie_ack(stcb);
1892                 if (spec_flag) {
1893                         /*
1894                          * only if we have retrans set do we do this. What
1895                          * this call does is get only the COOKIE-ACK out and
1896                          * then when we return the normal call to
1897                          * sctp_chunk_output will get the retrans out behind
1898                          * this.
1899                          */
1900                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1901                 }
1902                 if (how_indx < sizeof(asoc->cookie_how))
1903                         asoc->cookie_how[how_indx] = 11;
1904
1905                 return (stcb);
1906         }
1907         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1908             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1909             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1910             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1911             cookie->tie_tag_peer_vtag != 0) {
1912                 struct sctpasochead *head;
1913 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1914                 struct socket *so;
1915 #endif
1916
1917                 if (asoc->peer_supports_nat) {
1918                         /*
1919                          * This is a gross gross hack. Just call the
1920                          * cookie_new code since we are allowing a duplicate
1921                          * association. I hope this works...
1922                          */
1923                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1924                             sh, cookie, cookie_len,
1925                             inp, netp, init_src, notification,
1926                             auth_skipped, auth_offset, auth_len,
1927                             mflowtype, mflowid,
1928                             vrf_id, port));
1929                 }
1930                 /*
1931                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1932                  */
1933                 /* temp code */
1934                 if (how_indx < sizeof(asoc->cookie_how))
1935                         asoc->cookie_how[how_indx] = 12;
1936                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1937                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1938                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1939                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1940
1941                 /* notify upper layer */
1942                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1943                 atomic_add_int(&stcb->asoc.refcnt, 1);
1944                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1945                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1946                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1947                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1948                 }
1949                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1950                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1951                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1952                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1953                 }
1954                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1955                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1956                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1957                             stcb->sctp_ep, stcb, NULL);
1958
1959                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1960                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1961                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1962                 }
1963                 asoc->pre_open_streams =
1964                     ntohs(initack_cp->init.num_outbound_streams);
1965                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1966                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1967                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1968
1969                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1970
1971                 asoc->str_reset_seq_in = asoc->init_seq_number;
1972
1973                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1974                 if (asoc->mapping_array) {
1975                         memset(asoc->mapping_array, 0,
1976                             asoc->mapping_array_size);
1977                 }
1978                 if (asoc->nr_mapping_array) {
1979                         memset(asoc->nr_mapping_array, 0,
1980                             asoc->mapping_array_size);
1981                 }
1982                 SCTP_TCB_UNLOCK(stcb);
1983 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1984                 so = SCTP_INP_SO(stcb->sctp_ep);
1985                 SCTP_SOCKET_LOCK(so, 1);
1986 #endif
1987                 SCTP_INP_INFO_WLOCK();
1988                 SCTP_INP_WLOCK(stcb->sctp_ep);
1989                 SCTP_TCB_LOCK(stcb);
1990                 atomic_add_int(&stcb->asoc.refcnt, -1);
1991                 /* send up all the data */
1992                 SCTP_TCB_SEND_LOCK(stcb);
1993
1994                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1995                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1996                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1997 #if defined(SCTP_DETAILED_STR_STATS)
1998                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1999                                 asoc->strmout[i].abandoned_sent[j] = 0;
2000                                 asoc->strmout[i].abandoned_unsent[j] = 0;
2001                         }
2002 #else
2003                         asoc->strmout[i].abandoned_sent[0] = 0;
2004                         asoc->strmout[i].abandoned_unsent[0] = 0;
2005 #endif
2006                         stcb->asoc.strmout[i].sid = i;
2007                         stcb->asoc.strmout[i].next_mid_ordered = 0;
2008                         stcb->asoc.strmout[i].next_mid_unordered = 0;
2009                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
2010                 }
2011                 /* process the INIT-ACK info (my info) */
2012                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2013                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2014
2015                 /* pull from vtag hash */
2016                 LIST_REMOVE(stcb, sctp_asocs);
2017                 /* re-insert to new vtag position */
2018                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
2019                     SCTP_BASE_INFO(hashasocmark))];
2020                 /*
2021                  * put it in the bucket in the vtag hash of assoc's for the
2022                  * system
2023                  */
2024                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
2025
2026                 SCTP_TCB_SEND_UNLOCK(stcb);
2027                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
2028                 SCTP_INP_INFO_WUNLOCK();
2029 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2030                 SCTP_SOCKET_UNLOCK(so, 1);
2031 #endif
2032                 asoc->total_flight = 0;
2033                 asoc->total_flight_count = 0;
2034                 /* process the INIT info (peer's info) */
2035                 retval = sctp_process_init(init_cp, stcb);
2036                 if (retval < 0) {
2037                         if (how_indx < sizeof(asoc->cookie_how))
2038                                 asoc->cookie_how[how_indx] = 13;
2039
2040                         return (NULL);
2041                 }
2042                 /*
2043                  * since we did not send a HB make sure we don't double
2044                  * things
2045                  */
2046                 net->hb_responded = 1;
2047
2048                 if (sctp_load_addresses_from_init(stcb, m,
2049                     init_offset + sizeof(struct sctp_init_chunk),
2050                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
2051                         if (how_indx < sizeof(asoc->cookie_how))
2052                                 asoc->cookie_how[how_indx] = 14;
2053
2054                         return (NULL);
2055                 }
2056                 /* respond with a COOKIE-ACK */
2057                 sctp_stop_all_cookie_timers(stcb);
2058                 sctp_toss_old_cookies(stcb, asoc);
2059                 sctp_send_cookie_ack(stcb);
2060                 if (how_indx < sizeof(asoc->cookie_how))
2061                         asoc->cookie_how[how_indx] = 15;
2062
2063                 return (stcb);
2064         }
2065         if (how_indx < sizeof(asoc->cookie_how))
2066                 asoc->cookie_how[how_indx] = 16;
2067         /* all other cases... */
2068         return (NULL);
2069 }
2070
2071
2072 /*
2073  * handle a state cookie for a new association m: input packet mbuf chain--
2074  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2075  * and the cookie signature does not exist offset: offset into mbuf to the
2076  * cookie-echo chunk length: length of the cookie chunk to: where the init
2077  * was from returns a new TCB
2078  */
2079 static struct sctp_tcb *
2080 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2081     struct sockaddr *src, struct sockaddr *dst,
2082     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2083     struct sctp_inpcb *inp, struct sctp_nets **netp,
2084     struct sockaddr *init_src, int *notification,
2085     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2086     uint8_t mflowtype, uint32_t mflowid,
2087     uint32_t vrf_id, uint16_t port)
2088 {
2089         struct sctp_tcb *stcb;
2090         struct sctp_init_chunk *init_cp, init_buf;
2091         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2092         union sctp_sockstore store;
2093         struct sctp_association *asoc;
2094         int init_offset, initack_offset, initack_limit;
2095         int retval;
2096         int error = 0;
2097         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2098 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2099         struct socket *so;
2100
2101         so = SCTP_INP_SO(inp);
2102 #endif
2103
2104         /*
2105          * find and validate the INIT chunk in the cookie (peer's info) the
2106          * INIT should start after the cookie-echo header struct (chunk
2107          * header, state cookie header struct)
2108          */
2109         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2110         init_cp = (struct sctp_init_chunk *)
2111             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2112             (uint8_t *)&init_buf);
2113         if (init_cp == NULL) {
2114                 /* could not pull a INIT chunk in cookie */
2115                 SCTPDBG(SCTP_DEBUG_INPUT1,
2116                     "process_cookie_new: could not pull INIT chunk hdr\n");
2117                 return (NULL);
2118         }
2119         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2120                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2121                 return (NULL);
2122         }
2123         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2124         /*
2125          * find and validate the INIT-ACK chunk in the cookie (my info) the
2126          * INIT-ACK follows the INIT chunk
2127          */
2128         initack_cp = (struct sctp_init_ack_chunk *)
2129             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2130             (uint8_t *)&initack_buf);
2131         if (initack_cp == NULL) {
2132                 /* could not pull INIT-ACK chunk in cookie */
2133                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2134                 return (NULL);
2135         }
2136         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2137                 return (NULL);
2138         }
2139         /*
2140          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2141          * "initack_limit" value.  This is because the chk_length field
2142          * includes the length of the cookie, but the cookie is omitted when
2143          * the INIT and INIT_ACK are tacked onto the cookie...
2144          */
2145         initack_limit = offset + cookie_len;
2146
2147         /*
2148          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2149          * and popluate
2150          */
2151
2152         /*
2153          * Here we do a trick, we set in NULL for the proc/thread argument.
2154          * We do this since in effect we only use the p argument when the
2155          * socket is unbound and we must do an implicit bind. Since we are
2156          * getting a cookie, we cannot be unbound.
2157          */
2158         stcb = sctp_aloc_assoc(inp, init_src, &error,
2159             ntohl(initack_cp->init.initiate_tag), vrf_id,
2160             ntohs(initack_cp->init.num_outbound_streams),
2161             port,
2162             (struct thread *)NULL,
2163             SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2164         if (stcb == NULL) {
2165                 struct mbuf *op_err;
2166
2167                 /* memory problem? */
2168                 SCTPDBG(SCTP_DEBUG_INPUT1,
2169                     "process_cookie_new: no room for another TCB!\n");
2170                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2171                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2172                     src, dst, sh, op_err,
2173                     mflowtype, mflowid,
2174                     vrf_id, port);
2175                 return (NULL);
2176         }
2177         /* get the correct sctp_nets */
2178         if (netp)
2179                 *netp = sctp_findnet(stcb, init_src);
2180
2181         asoc = &stcb->asoc;
2182         /* get scope variables out of cookie */
2183         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2184         asoc->scope.site_scope = cookie->site_scope;
2185         asoc->scope.local_scope = cookie->local_scope;
2186         asoc->scope.loopback_scope = cookie->loopback_scope;
2187
2188         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2189             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2190                 struct mbuf *op_err;
2191
2192                 /*
2193                  * Houston we have a problem. The EP changed while the
2194                  * cookie was in flight. Only recourse is to abort the
2195                  * association.
2196                  */
2197                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2198                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2199                     src, dst, sh, op_err,
2200                     mflowtype, mflowid,
2201                     vrf_id, port);
2202 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2203                 atomic_add_int(&stcb->asoc.refcnt, 1);
2204                 SCTP_TCB_UNLOCK(stcb);
2205                 SCTP_SOCKET_LOCK(so, 1);
2206                 SCTP_TCB_LOCK(stcb);
2207                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2208 #endif
2209                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2210                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2211 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2212                 SCTP_SOCKET_UNLOCK(so, 1);
2213 #endif
2214                 return (NULL);
2215         }
2216         /* process the INIT-ACK info (my info) */
2217         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2218         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2219         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2220         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2221         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2222         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2223         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2224         asoc->str_reset_seq_in = asoc->init_seq_number;
2225
2226         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2227
2228         /* process the INIT info (peer's info) */
2229         if (netp)
2230                 retval = sctp_process_init(init_cp, stcb);
2231         else
2232                 retval = 0;
2233         if (retval < 0) {
2234 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2235                 atomic_add_int(&stcb->asoc.refcnt, 1);
2236                 SCTP_TCB_UNLOCK(stcb);
2237                 SCTP_SOCKET_LOCK(so, 1);
2238                 SCTP_TCB_LOCK(stcb);
2239                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2240 #endif
2241                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2242                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2243 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2244                 SCTP_SOCKET_UNLOCK(so, 1);
2245 #endif
2246                 return (NULL);
2247         }
2248         /* load all addresses */
2249         if (sctp_load_addresses_from_init(stcb, m,
2250             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2251             src, dst, init_src, port)) {
2252 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2253                 atomic_add_int(&stcb->asoc.refcnt, 1);
2254                 SCTP_TCB_UNLOCK(stcb);
2255                 SCTP_SOCKET_LOCK(so, 1);
2256                 SCTP_TCB_LOCK(stcb);
2257                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2258 #endif
2259                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2260                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2261 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2262                 SCTP_SOCKET_UNLOCK(so, 1);
2263 #endif
2264                 return (NULL);
2265         }
2266         /*
2267          * verify any preceding AUTH chunk that was skipped
2268          */
2269         /* pull the local authentication parameters from the cookie/init-ack */
2270         sctp_auth_get_cookie_params(stcb, m,
2271             initack_offset + sizeof(struct sctp_init_ack_chunk),
2272             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2273         if (auth_skipped) {
2274                 struct sctp_auth_chunk *auth;
2275
2276                 auth = (struct sctp_auth_chunk *)
2277                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2278                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2279                         /* auth HMAC failed, dump the assoc and packet */
2280                         SCTPDBG(SCTP_DEBUG_AUTH1,
2281                             "COOKIE-ECHO: AUTH failed\n");
2282 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2283                         atomic_add_int(&stcb->asoc.refcnt, 1);
2284                         SCTP_TCB_UNLOCK(stcb);
2285                         SCTP_SOCKET_LOCK(so, 1);
2286                         SCTP_TCB_LOCK(stcb);
2287                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2288 #endif
2289                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2290                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2291 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2292                         SCTP_SOCKET_UNLOCK(so, 1);
2293 #endif
2294                         return (NULL);
2295                 } else {
2296                         /* remaining chunks checked... good to go */
2297                         stcb->asoc.authenticated = 1;
2298                 }
2299         }
2300
2301         /*
2302          * if we're doing ASCONFs, check to see if we have any new local
2303          * addresses that need to get added to the peer (eg. addresses
2304          * changed while cookie echo in flight).  This needs to be done
2305          * after we go to the OPEN state to do the correct asconf
2306          * processing. else, make sure we have the correct addresses in our
2307          * lists
2308          */
2309
2310         /* warning, we re-use sin, sin6, sa_store here! */
2311         /* pull in local_address (our "from" address) */
2312         switch (cookie->laddr_type) {
2313 #ifdef INET
2314         case SCTP_IPV4_ADDRESS:
2315                 /* source addr is IPv4 */
2316                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2317                 store.sin.sin_family = AF_INET;
2318                 store.sin.sin_len = sizeof(struct sockaddr_in);
2319                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2320                 break;
2321 #endif
2322 #ifdef INET6
2323         case SCTP_IPV6_ADDRESS:
2324                 /* source addr is IPv6 */
2325                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2326                 store.sin6.sin6_family = AF_INET6;
2327                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2328                 store.sin6.sin6_scope_id = cookie->scope_id;
2329                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2330                 break;
2331 #endif
2332         default:
2333 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2334                 atomic_add_int(&stcb->asoc.refcnt, 1);
2335                 SCTP_TCB_UNLOCK(stcb);
2336                 SCTP_SOCKET_LOCK(so, 1);
2337                 SCTP_TCB_LOCK(stcb);
2338                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2339 #endif
2340                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2341                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2342 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2343                 SCTP_SOCKET_UNLOCK(so, 1);
2344 #endif
2345                 return (NULL);
2346         }
2347
2348         /* update current state */
2349         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2350         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2351         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2352                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2353                     stcb->sctp_ep, stcb, NULL);
2354         }
2355         sctp_stop_all_cookie_timers(stcb);
2356         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2357         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2358
2359         /* set up to notify upper layer */
2360         *notification = SCTP_NOTIFY_ASSOC_UP;
2361         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2362             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2363             (!SCTP_IS_LISTENING(inp))) {
2364                 /*
2365                  * This is an endpoint that called connect() how it got a
2366                  * cookie that is NEW is a bit of a mystery. It must be that
2367                  * the INIT was sent, but before it got there.. a complete
2368                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2369                  * should have went to the other code.. not here.. oh well..
2370                  * a bit of protection is worth having..
2371                  */
2372                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2373 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2374                 atomic_add_int(&stcb->asoc.refcnt, 1);
2375                 SCTP_TCB_UNLOCK(stcb);
2376                 SCTP_SOCKET_LOCK(so, 1);
2377                 SCTP_TCB_LOCK(stcb);
2378                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2379                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2380                         SCTP_SOCKET_UNLOCK(so, 1);
2381                         return (NULL);
2382                 }
2383 #endif
2384                 soisconnected(stcb->sctp_socket);
2385 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2386                 SCTP_SOCKET_UNLOCK(so, 1);
2387 #endif
2388         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2389             (SCTP_IS_LISTENING(inp))) {
2390                 /*
2391                  * We don't want to do anything with this one. Since it is
2392                  * the listening guy. The timer will get started for
2393                  * accepted connections in the caller.
2394                  */
2395                 ;
2396         }
2397         /* since we did not send a HB make sure we don't double things */
2398         if ((netp) && (*netp))
2399                 (*netp)->hb_responded = 1;
2400
2401         if (stcb->asoc.sctp_autoclose_ticks &&
2402             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2403                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2404         }
2405         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2406         if ((netp != NULL) && (*netp != NULL)) {
2407                 struct timeval old;
2408
2409                 /* calculate the RTT and set the encaps port */
2410                 old.tv_sec = cookie->time_entered.tv_sec;
2411                 old.tv_usec = cookie->time_entered.tv_usec;
2412                 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
2413         }
2414         /* respond with a COOKIE-ACK */
2415         sctp_send_cookie_ack(stcb);
2416
2417         /*
2418          * check the address lists for any ASCONFs that need to be sent
2419          * AFTER the cookie-ack is sent
2420          */
2421         sctp_check_address_list(stcb, m,
2422             initack_offset + sizeof(struct sctp_init_ack_chunk),
2423             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2424             &store.sa, cookie->local_scope, cookie->site_scope,
2425             cookie->ipv4_scope, cookie->loopback_scope);
2426
2427
2428         return (stcb);
2429 }
2430
2431 /*
2432  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2433  * we NEED to make sure we are not already using the vtag. If so we
2434  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2435         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2436                                                             SCTP_BASE_INFO(hashasocmark))];
2437         LIST_FOREACH(stcb, head, sctp_asocs) {
2438                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2439                        -- SEND ABORT - TRY AGAIN --
2440                 }
2441         }
2442 */
2443
2444 /*
2445  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2446  * existing (non-NULL) TCB
2447  */
2448 static struct mbuf *
2449 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2450     struct sockaddr *src, struct sockaddr *dst,
2451     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2452     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2453     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2454     struct sctp_tcb **locked_tcb,
2455     uint8_t mflowtype, uint32_t mflowid,
2456     uint32_t vrf_id, uint16_t port)
2457 {
2458         struct sctp_state_cookie *cookie;
2459         struct sctp_tcb *l_stcb = *stcb;
2460         struct sctp_inpcb *l_inp;
2461         struct sockaddr *to;
2462         struct sctp_pcb *ep;
2463         struct mbuf *m_sig;
2464         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2465         uint8_t *sig;
2466         uint8_t cookie_ok = 0;
2467         unsigned int sig_offset, cookie_offset;
2468         unsigned int cookie_len;
2469         struct timeval now;
2470         struct timeval time_expires;
2471         int notification = 0;
2472         struct sctp_nets *netl;
2473         int had_a_existing_tcb = 0;
2474         int send_int_conf = 0;
2475 #ifdef INET
2476         struct sockaddr_in sin;
2477 #endif
2478 #ifdef INET6
2479         struct sockaddr_in6 sin6;
2480 #endif
2481
2482         SCTPDBG(SCTP_DEBUG_INPUT2,
2483             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2484
2485         if (inp_p == NULL) {
2486                 return (NULL);
2487         }
2488         cookie = &cp->cookie;
2489         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2490         cookie_len = ntohs(cp->ch.chunk_length);
2491
2492         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2493             sizeof(struct sctp_init_chunk) +
2494             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2495                 /* cookie too small */
2496                 return (NULL);
2497         }
2498         if ((cookie->peerport != sh->src_port) ||
2499             (cookie->myport != sh->dest_port) ||
2500             (cookie->my_vtag != sh->v_tag)) {
2501                 /*
2502                  * invalid ports or bad tag.  Note that we always leave the
2503                  * v_tag in the header in network order and when we stored
2504                  * it in the my_vtag slot we also left it in network order.
2505                  * This maintains the match even though it may be in the
2506                  * opposite byte order of the machine :->
2507                  */
2508                 return (NULL);
2509         }
2510         /*
2511          * split off the signature into its own mbuf (since it should not be
2512          * calculated in the sctp_hmac_m() call).
2513          */
2514         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2515         m_sig = m_split(m, sig_offset, M_NOWAIT);
2516         if (m_sig == NULL) {
2517                 /* out of memory or ?? */
2518                 return (NULL);
2519         }
2520 #ifdef SCTP_MBUF_LOGGING
2521         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2522                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2523         }
2524 #endif
2525
2526         /*
2527          * compute the signature/digest for the cookie
2528          */
2529         ep = &(*inp_p)->sctp_ep;
2530         l_inp = *inp_p;
2531         if (l_stcb) {
2532                 SCTP_TCB_UNLOCK(l_stcb);
2533         }
2534         SCTP_INP_RLOCK(l_inp);
2535         if (l_stcb) {
2536                 SCTP_TCB_LOCK(l_stcb);
2537         }
2538         /* which cookie is it? */
2539         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2540             (ep->current_secret_number != ep->last_secret_number)) {
2541                 /* it's the old cookie */
2542                 (void)sctp_hmac_m(SCTP_HMAC,
2543                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2544                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2545         } else {
2546                 /* it's the current cookie */
2547                 (void)sctp_hmac_m(SCTP_HMAC,
2548                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2549                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2550         }
2551         /* get the signature */
2552         SCTP_INP_RUNLOCK(l_inp);
2553         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2554         if (sig == NULL) {
2555                 /* couldn't find signature */
2556                 sctp_m_freem(m_sig);
2557                 return (NULL);
2558         }
2559         /* compare the received digest with the computed digest */
2560         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2561                 /* try the old cookie? */
2562                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2563                     (ep->current_secret_number != ep->last_secret_number)) {
2564                         /* compute digest with old */
2565                         (void)sctp_hmac_m(SCTP_HMAC,
2566                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2567                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2568                         /* compare */
2569                         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2570                                 cookie_ok = 1;
2571                 }
2572         } else {
2573                 cookie_ok = 1;
2574         }
2575
2576         /*
2577          * Now before we continue we must reconstruct our mbuf so that
2578          * normal processing of any other chunks will work.
2579          */
2580         {
2581                 struct mbuf *m_at;
2582
2583                 m_at = m;
2584                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2585                         m_at = SCTP_BUF_NEXT(m_at);
2586                 }
2587                 SCTP_BUF_NEXT(m_at) = m_sig;
2588         }
2589
2590         if (cookie_ok == 0) {
2591                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2592                 SCTPDBG(SCTP_DEBUG_INPUT2,
2593                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2594                     (uint32_t)offset, cookie_offset, sig_offset);
2595                 return (NULL);
2596         }
2597
2598         /*
2599          * check the cookie timestamps to be sure it's not stale
2600          */
2601         (void)SCTP_GETTIME_TIMEVAL(&now);
2602         /* Expire time is in Ticks, so we convert to seconds */
2603         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2604         time_expires.tv_usec = cookie->time_entered.tv_usec;
2605         if (timevalcmp(&now, &time_expires, >)) {
2606                 /* cookie is stale! */
2607                 struct mbuf *op_err;
2608                 struct sctp_error_stale_cookie *cause;
2609                 struct timeval diff;
2610                 uint32_t staleness;
2611
2612                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2613                     0, M_NOWAIT, 1, MT_DATA);
2614                 if (op_err == NULL) {
2615                         /* FOOBAR */
2616                         return (NULL);
2617                 }
2618                 /* Set the len */
2619                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2620                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2621                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2622                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2623                     (sizeof(uint32_t))));
2624                 diff = now;
2625                 timevalsub(&diff, &time_expires);
2626                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2627                         staleness = UINT32_MAX;
2628                 } else {
2629                         staleness = diff.tv_sec * 1000000;
2630                 }
2631                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2632                         staleness += diff.tv_usec;
2633                 } else {
2634                         staleness = UINT32_MAX;
2635                 }
2636                 cause->stale_time = htonl(staleness);
2637                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2638                     mflowtype, mflowid, l_inp->fibnum,
2639                     vrf_id, port);
2640                 return (NULL);
2641         }
2642         /*
2643          * Now we must see with the lookup address if we have an existing
2644          * asoc. This will only happen if we were in the COOKIE-WAIT state
2645          * and a INIT collided with us and somewhere the peer sent the
2646          * cookie on another address besides the single address our assoc
2647          * had for him. In this case we will have one of the tie-tags set at
2648          * least AND the address field in the cookie can be used to look it
2649          * up.
2650          */
2651         to = NULL;
2652         switch (cookie->addr_type) {
2653 #ifdef INET6
2654         case SCTP_IPV6_ADDRESS:
2655                 memset(&sin6, 0, sizeof(sin6));
2656                 sin6.sin6_family = AF_INET6;
2657                 sin6.sin6_len = sizeof(sin6);
2658                 sin6.sin6_port = sh->src_port;
2659                 sin6.sin6_scope_id = cookie->scope_id;
2660                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2661                     sizeof(sin6.sin6_addr.s6_addr));
2662                 to = (struct sockaddr *)&sin6;
2663                 break;
2664 #endif
2665 #ifdef INET
2666         case SCTP_IPV4_ADDRESS:
2667                 memset(&sin, 0, sizeof(sin));
2668                 sin.sin_family = AF_INET;
2669                 sin.sin_len = sizeof(sin);
2670                 sin.sin_port = sh->src_port;
2671                 sin.sin_addr.s_addr = cookie->address[0];
2672                 to = (struct sockaddr *)&sin;
2673                 break;
2674 #endif
2675         default:
2676                 /* This should not happen */
2677                 return (NULL);
2678         }
2679         if (*stcb == NULL) {
2680                 /* Yep, lets check */
2681                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2682                 if (*stcb == NULL) {
2683                         /*
2684                          * We should have only got back the same inp. If we
2685                          * got back a different ep we have a problem. The
2686                          * original findep got back l_inp and now
2687                          */
2688                         if (l_inp != *inp_p) {
2689                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2690                         }
2691                 } else {
2692                         if (*locked_tcb == NULL) {
2693                                 /*
2694                                  * In this case we found the assoc only
2695                                  * after we locked the create lock. This
2696                                  * means we are in a colliding case and we
2697                                  * must make sure that we unlock the tcb if
2698                                  * its one of the cases where we throw away
2699                                  * the incoming packets.
2700                                  */
2701                                 *locked_tcb = *stcb;
2702
2703                                 /*
2704                                  * We must also increment the inp ref count
2705                                  * since the ref_count flags was set when we
2706                                  * did not find the TCB, now we found it
2707                                  * which reduces the refcount.. we must
2708                                  * raise it back out to balance it all :-)
2709                                  */
2710                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2711                                 if ((*stcb)->sctp_ep != l_inp) {
2712                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2713                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2714                                 }
2715                         }
2716                 }
2717         }
2718
2719         cookie_len -= SCTP_SIGNATURE_SIZE;
2720         if (*stcb == NULL) {
2721                 /* this is the "normal" case... get a new TCB */
2722                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2723                     cookie, cookie_len, *inp_p,
2724                     netp, to, &notification,
2725                     auth_skipped, auth_offset, auth_len,
2726                     mflowtype, mflowid,
2727                     vrf_id, port);
2728         } else {
2729                 /* this is abnormal... cookie-echo on existing TCB */
2730                 had_a_existing_tcb = 1;
2731                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2732                     src, dst, sh,
2733                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2734                     &notification, auth_skipped, auth_offset, auth_len,
2735                     mflowtype, mflowid,
2736                     vrf_id, port);
2737         }
2738
2739         if (*stcb == NULL) {
2740                 /* still no TCB... must be bad cookie-echo */
2741                 return (NULL);
2742         }
2743         if (*netp != NULL) {
2744                 (*netp)->flowtype = mflowtype;
2745                 (*netp)->flowid = mflowid;
2746         }
2747         /*
2748          * Ok, we built an association so confirm the address we sent the
2749          * INIT-ACK to.
2750          */
2751         netl = sctp_findnet(*stcb, to);
2752         /*
2753          * This code should in theory NOT run but
2754          */
2755         if (netl == NULL) {
2756                 /* TSNH! Huh, why do I need to add this address here? */
2757                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2758                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2759                         return (NULL);
2760                 }
2761                 netl = sctp_findnet(*stcb, to);
2762         }
2763         if (netl) {
2764                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2765                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2766                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2767                             netl);
2768                         send_int_conf = 1;
2769                 }
2770         }
2771         sctp_start_net_timers(*stcb);
2772         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2773                 if (!had_a_existing_tcb ||
2774                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2775                         /*
2776                          * If we have a NEW cookie or the connect never
2777                          * reached the connected state during collision we
2778                          * must do the TCP accept thing.
2779                          */
2780                         struct socket *so, *oso;
2781                         struct sctp_inpcb *inp;
2782
2783                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2784                                 /*
2785                                  * For a restart we will keep the same
2786                                  * socket, no need to do anything. I THINK!!
2787                                  */
2788                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2789                                 if (send_int_conf) {
2790                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2791                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2792                                 }
2793                                 return (m);
2794                         }
2795                         oso = (*inp_p)->sctp_socket;
2796                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2797                         SCTP_TCB_UNLOCK((*stcb));
2798                         CURVNET_SET(oso->so_vnet);
2799                         so = sonewconn(oso, 0
2800                             );
2801                         CURVNET_RESTORE();
2802                         SCTP_TCB_LOCK((*stcb));
2803                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2804
2805                         if (so == NULL) {
2806                                 struct mbuf *op_err;
2807 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2808                                 struct socket *pcb_so;
2809 #endif
2810                                 /* Too many sockets */
2811                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2812                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2813                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2814                                     src, dst, sh, op_err,
2815                                     mflowtype, mflowid,
2816                                     vrf_id, port);
2817 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2818                                 pcb_so = SCTP_INP_SO(*inp_p);
2819                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2820                                 SCTP_TCB_UNLOCK((*stcb));
2821                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2822                                 SCTP_TCB_LOCK((*stcb));
2823                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2824 #endif
2825                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2826                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2827 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2828                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2829 #endif
2830                                 return (NULL);
2831                         }
2832                         inp = (struct sctp_inpcb *)so->so_pcb;
2833                         SCTP_INP_INCR_REF(inp);
2834                         /*
2835                          * We add the unbound flag here so that if we get an
2836                          * soabort() before we get the move_pcb done, we
2837                          * will properly cleanup.
2838                          */
2839                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2840                             SCTP_PCB_FLAGS_CONNECTED |
2841                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2842                             SCTP_PCB_FLAGS_UNBOUND |
2843                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2844                             SCTP_PCB_FLAGS_DONT_WAKE);
2845                         inp->sctp_features = (*inp_p)->sctp_features;
2846                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2847                         inp->sctp_socket = so;
2848                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2849                         inp->max_cwnd = (*inp_p)->max_cwnd;
2850                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2851                         inp->ecn_supported = (*inp_p)->ecn_supported;
2852                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2853                         inp->auth_supported = (*inp_p)->auth_supported;
2854                         inp->asconf_supported = (*inp_p)->asconf_supported;
2855                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2856                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2857                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2858                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2859                         inp->sctp_context = (*inp_p)->sctp_context;
2860                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2861                         inp->fibnum = (*inp_p)->fibnum;
2862                         inp->inp_starting_point_for_iterator = NULL;
2863                         /*
2864                          * copy in the authentication parameters from the
2865                          * original endpoint
2866                          */
2867                         if (inp->sctp_ep.local_hmacs)
2868                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2869                         inp->sctp_ep.local_hmacs =
2870                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2871                         if (inp->sctp_ep.local_auth_chunks)
2872                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2873                         inp->sctp_ep.local_auth_chunks =
2874                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2875
2876                         /*
2877                          * Now we must move it from one hash table to
2878                          * another and get the tcb in the right place.
2879                          */
2880
2881                         /*
2882                          * This is where the one-2-one socket is put into
2883                          * the accept state waiting for the accept!
2884                          */
2885                         if (*stcb) {
2886                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2887                         }
2888                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2889
2890                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2891                         SCTP_TCB_UNLOCK((*stcb));
2892
2893                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2894                             0);
2895                         SCTP_TCB_LOCK((*stcb));
2896                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2897
2898
2899                         /*
2900                          * now we must check to see if we were aborted while
2901                          * the move was going on and the lock/unlock
2902                          * happened.
2903                          */
2904                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2905                                 /*
2906                                  * yep it was, we leave the assoc attached
2907                                  * to the socket since the sctp_inpcb_free()
2908                                  * call will send an abort for us.
2909                                  */
2910                                 SCTP_INP_DECR_REF(inp);
2911                                 return (NULL);
2912                         }
2913                         SCTP_INP_DECR_REF(inp);
2914                         /* Switch over to the new guy */
2915                         *inp_p = inp;
2916                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2917                         if (send_int_conf) {
2918                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2919                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2920                         }
2921
2922                         /*
2923                          * Pull it from the incomplete queue and wake the
2924                          * guy
2925                          */
2926 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2927                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2928                         SCTP_TCB_UNLOCK((*stcb));
2929                         SCTP_SOCKET_LOCK(so, 1);
2930 #endif
2931                         soisconnected(so);
2932 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2933                         SCTP_TCB_LOCK((*stcb));
2934                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2935                         SCTP_SOCKET_UNLOCK(so, 1);
2936 #endif
2937                         return (m);
2938                 }
2939         }
2940         if (notification) {
2941                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2942         }
2943         if (send_int_conf) {
2944                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2945                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2946         }
2947         return (m);
2948 }
2949
2950 static void
2951 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2952     struct sctp_tcb *stcb, struct sctp_nets *net)
2953 {
2954         /* cp must not be used, others call this without a c-ack :-) */
2955         struct sctp_association *asoc;
2956
2957         SCTPDBG(SCTP_DEBUG_INPUT2,
2958             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2959         if ((stcb == NULL) || (net == NULL)) {
2960                 return;
2961         }
2962
2963         asoc = &stcb->asoc;
2964         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2965                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2966                     asoc->overall_error_count,
2967                     0,
2968                     SCTP_FROM_SCTP_INPUT,
2969                     __LINE__);
2970         }
2971         asoc->overall_error_count = 0;
2972         sctp_stop_all_cookie_timers(stcb);
2973         /* process according to association state */
2974         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2975                 /* state change only needed when I am in right state */
2976                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2977                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2978                 sctp_start_net_timers(stcb);
2979                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2980                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2981                             stcb->sctp_ep, stcb, NULL);
2982
2983                 }
2984                 /* update RTO */
2985                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2986                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2987                 if (asoc->overall_error_count == 0) {
2988                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2989                             SCTP_RTT_FROM_NON_DATA);
2990                 }
2991                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2992                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2993                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2994                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2995 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2996                         struct socket *so;
2997
2998 #endif
2999                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
3000 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3001                         so = SCTP_INP_SO(stcb->sctp_ep);
3002                         atomic_add_int(&stcb->asoc.refcnt, 1);
3003                         SCTP_TCB_UNLOCK(stcb);
3004                         SCTP_SOCKET_LOCK(so, 1);
3005                         SCTP_TCB_LOCK(stcb);
3006                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3007 #endif
3008                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
3009                                 soisconnected(stcb->sctp_socket);
3010                         }
3011 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3012                         SCTP_SOCKET_UNLOCK(so, 1);
3013 #endif
3014                 }
3015                 /*
3016                  * since we did not send a HB make sure we don't double
3017                  * things
3018                  */
3019                 net->hb_responded = 1;
3020
3021                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
3022                         /*
3023                          * We don't need to do the asconf thing, nor hb or
3024                          * autoclose if the socket is closed.
3025                          */
3026                         goto closed_socket;
3027                 }
3028
3029                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
3030                     stcb, net);
3031
3032
3033                 if (stcb->asoc.sctp_autoclose_ticks &&
3034                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
3035                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
3036                             stcb->sctp_ep, stcb, NULL);
3037                 }
3038                 /*
3039                  * send ASCONF if parameters are pending and ASCONFs are
3040                  * allowed (eg. addresses changed when init/cookie echo were
3041                  * in flight)
3042                  */
3043                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
3044                     (stcb->asoc.asconf_supported == 1) &&
3045                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
3046 #ifdef SCTP_TIMER_BASED_ASCONF
3047                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
3048                             stcb->sctp_ep, stcb,
3049                             stcb->asoc.primary_destination);
3050 #else
3051                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3052                             SCTP_ADDR_NOT_LOCKED);
3053 #endif
3054                 }
3055         }
3056 closed_socket:
3057         /* Toss the cookie if I can */
3058         sctp_toss_old_cookies(stcb, asoc);
3059         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3060                 /* Restart the timer if we have pending data */
3061                 struct sctp_tmit_chunk *chk;
3062
3063                 chk = TAILQ_FIRST(&asoc->sent_queue);
3064                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3065         }
3066 }
3067
3068 static void
3069 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3070     struct sctp_tcb *stcb)
3071 {
3072         struct sctp_nets *net;
3073         struct sctp_tmit_chunk *lchk;
3074         struct sctp_ecne_chunk bkup;
3075         uint8_t override_bit;
3076         uint32_t tsn, window_data_tsn;
3077         int len;
3078         unsigned int pkt_cnt;
3079
3080         len = ntohs(cp->ch.chunk_length);
3081         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3082             (len != sizeof(struct old_sctp_ecne_chunk))) {
3083                 return;
3084         }
3085         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3086                 /* Its the old format */
3087                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3088                 bkup.num_pkts_since_cwr = htonl(1);
3089                 cp = &bkup;
3090         }
3091         SCTP_STAT_INCR(sctps_recvecne);
3092         tsn = ntohl(cp->tsn);
3093         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3094         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3095         if (lchk == NULL) {
3096                 window_data_tsn = stcb->asoc.sending_seq - 1;
3097         } else {
3098                 window_data_tsn = lchk->rec.data.tsn;
3099         }
3100
3101         /* Find where it was sent to if possible. */
3102         net = NULL;
3103         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3104                 if (lchk->rec.data.tsn == tsn) {
3105                         net = lchk->whoTo;
3106                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3107                         break;
3108                 }
3109                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
3110                         break;
3111                 }
3112         }
3113         if (net == NULL) {
3114                 /*
3115                  * What to do. A previous send of a CWR was possibly lost.
3116                  * See how old it is, we may have it marked on the actual
3117                  * net.
3118                  */
3119                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3120                         if (tsn == net->last_cwr_tsn) {
3121                                 /* Found him, send it off */
3122                                 break;
3123                         }
3124                 }
3125                 if (net == NULL) {
3126                         /*
3127                          * If we reach here, we need to send a special CWR
3128                          * that says hey, we did this a long time ago and
3129                          * you lost the response.
3130                          */
3131                         net = TAILQ_FIRST(&stcb->asoc.nets);
3132                         if (net == NULL) {
3133                                 /* TSNH */
3134                                 return;
3135                         }
3136                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3137                 } else {
3138                         override_bit = 0;
3139                 }
3140         } else {
3141                 override_bit = 0;
3142         }
3143         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3144             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3145                 /*
3146                  * JRS - Use the congestion control given in the pluggable
3147                  * CC module
3148                  */
3149                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3150                 /*
3151                  * We reduce once every RTT. So we will only lower cwnd at
3152                  * the next sending seq i.e. the window_data_tsn
3153                  */
3154                 net->cwr_window_tsn = window_data_tsn;
3155                 net->ecn_ce_pkt_cnt += pkt_cnt;
3156                 net->lost_cnt = pkt_cnt;
3157                 net->last_cwr_tsn = tsn;
3158         } else {
3159                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3160                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3161                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3162                         /*
3163                          * Another loss in the same window update how many
3164                          * marks/packets lost we have had.
3165                          */
3166                         int cnt = 1;
3167
3168                         if (pkt_cnt > net->lost_cnt) {
3169                                 /* Should be the case */
3170                                 cnt = (pkt_cnt - net->lost_cnt);
3171                                 net->ecn_ce_pkt_cnt += cnt;
3172                         }
3173                         net->lost_cnt = pkt_cnt;
3174                         net->last_cwr_tsn = tsn;
3175                         /*
3176                          * Most CC functions will ignore this call, since we
3177                          * are in-window yet of the initial CE the peer saw.
3178                          */
3179                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3180                 }
3181         }
3182         /*
3183          * We always send a CWR this way if our previous one was lost our
3184          * peer will get an update, or if it is not time again to reduce we
3185          * still get the cwr to the peer. Note we set the override when we
3186          * could not find the TSN on the chunk or the destination network.
3187          */
3188         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3189 }
3190
3191 static void
3192 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3193 {
3194         /*
3195          * Here we get a CWR from the peer. We must look in the outqueue and
3196          * make sure that we have a covered ECNE in the control chunk part.
3197          * If so remove it.
3198          */
3199         struct sctp_tmit_chunk *chk, *nchk;
3200         struct sctp_ecne_chunk *ecne;
3201         int override;
3202         uint32_t cwr_tsn;
3203
3204         cwr_tsn = ntohl(cp->tsn);
3205         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3206         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
3207                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3208                         continue;
3209                 }
3210                 if ((override == 0) && (chk->whoTo != net)) {
3211                         /* Must be from the right src unless override is set */
3212                         continue;
3213                 }
3214                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3215                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3216                         /* this covers this ECNE, we can remove it */
3217                         stcb->asoc.ecn_echo_cnt_onq--;
3218                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3219                             sctp_next);
3220                         stcb->asoc.ctrl_queue_cnt--;
3221                         sctp_m_freem(chk->data);
3222                         chk->data = NULL;
3223                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3224                         if (override == 0) {
3225                                 break;
3226                         }
3227                 }
3228         }
3229 }
3230
3231 static void
3232 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3233     struct sctp_tcb *stcb, struct sctp_nets *net)
3234 {
3235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3236         struct socket *so;
3237 #endif
3238
3239         SCTPDBG(SCTP_DEBUG_INPUT2,
3240             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3241         if (stcb == NULL)
3242                 return;
3243
3244         /* process according to association state */
3245         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3246                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3247                 SCTPDBG(SCTP_DEBUG_INPUT2,
3248                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3249                 SCTP_TCB_UNLOCK(stcb);
3250                 return;
3251         }
3252         /* notify upper layer protocol */
3253         if (stcb->sctp_socket) {
3254                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3255         }
3256 #ifdef INVARIANTS
3257         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3258             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3259             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3260                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3261         }
3262 #endif
3263         /* stop the timer */
3264         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3265             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3266         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3267         /* free the TCB */
3268         SCTPDBG(SCTP_DEBUG_INPUT2,
3269             "sctp_handle_shutdown_complete: calls free-asoc\n");
3270 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3271         so = SCTP_INP_SO(stcb->sctp_ep);
3272         atomic_add_int(&stcb->asoc.refcnt, 1);
3273         SCTP_TCB_UNLOCK(stcb);
3274         SCTP_SOCKET_LOCK(so, 1);
3275         SCTP_TCB_LOCK(stcb);
3276         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3277 #endif
3278         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3279             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3280 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3281         SCTP_SOCKET_UNLOCK(so, 1);
3282 #endif
3283         return;
3284 }
3285
3286 static int
3287 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3288     struct sctp_nets *net, uint8_t flg)
3289 {
3290         switch (desc->chunk_type) {
3291         case SCTP_DATA:
3292                 /* find the tsn to resend (possibly */
3293                 {
3294                         uint32_t tsn;
3295                         struct sctp_tmit_chunk *tp1;
3296
3297                         tsn = ntohl(desc->tsn_ifany);
3298                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3299                                 if (tp1->rec.data.tsn == tsn) {
3300                                         /* found it */
3301                                         break;
3302                                 }
3303                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3304                                         /* not found */
3305                                         tp1 = NULL;
3306                                         break;
3307                                 }
3308                         }
3309                         if (tp1 == NULL) {
3310                                 /*
3311                                  * Do it the other way , aka without paying
3312                                  * attention to queue seq order.
3313                                  */
3314                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3315                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3316                                         if (tp1->rec.data.tsn == tsn) {
3317                                                 /* found it */
3318                                                 break;
3319                                         }
3320                                 }
3321                         }
3322                         if (tp1 == NULL) {
3323                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3324                         }
3325                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3326                                 uint8_t *ddp;
3327
3328                                 if (((flg & SCTP_BADCRC) == 0) &&
3329                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3330                                         return (0);
3331                                 }
3332                                 if ((stcb->asoc.peers_rwnd == 0) &&
3333                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3334                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3335                                         return (0);
3336                                 }
3337                                 if (stcb->asoc.peers_rwnd == 0 &&
3338                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3339                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3340                                         return (0);
3341                                 }
3342                                 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+
3343                                     sizeof(struct sctp_data_chunk));
3344                                 {
3345                                         unsigned int iii;
3346
3347                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3348                                             iii++) {
3349                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3350                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3351                                                         return (-1);
3352                                                 }
3353                                         }
3354                                 }
3355
3356                                 if (tp1->do_rtt) {
3357                                         /*
3358                                          * this guy had a RTO calculation
3359                                          * pending on it, cancel it
3360                                          */
3361                                         if (tp1->whoTo->rto_needed == 0) {
3362                                                 tp1->whoTo->rto_needed = 1;
3363                                         }
3364                                         tp1->do_rtt = 0;
3365                                 }
3366                                 SCTP_STAT_INCR(sctps_pdrpmark);
3367                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3368                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3369                                 /*
3370                                  * mark it as if we were doing a FR, since
3371                                  * we will be getting gap ack reports behind
3372                                  * the info from the router.
3373                                  */
3374                                 tp1->rec.data.doing_fast_retransmit = 1;
3375                                 /*
3376                                  * mark the tsn with what sequences can
3377                                  * cause a new FR.
3378                                  */
3379                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3380                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3381                                 } else {
3382                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3383                                 }
3384
3385                                 /* restart the timer */
3386                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3387                                     stcb, tp1->whoTo,
3388                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3389                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3390                                     stcb, tp1->whoTo);
3391
3392                                 /* fix counts and things */
3393                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3394                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3395                                             tp1->whoTo->flight_size,
3396                                             tp1->book_size,
3397                                             (uint32_t)(uintptr_t)stcb,
3398                                             tp1->rec.data.tsn);
3399                                 }
3400                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3401                                         sctp_flight_size_decrease(tp1);
3402                                         sctp_total_flight_decrease(stcb, tp1);
3403                                 }
3404                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3405                         } {
3406                                 /* audit code */
3407                                 unsigned int audit;
3408
3409                                 audit = 0;
3410                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3411                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3412                                                 audit++;
3413                                 }
3414                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3415                                     sctp_next) {
3416                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3417                                                 audit++;
3418                                 }
3419                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3420                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3421                                             audit, stcb->asoc.sent_queue_retran_cnt);
3422 #ifndef SCTP_AUDITING_ENABLED
3423                                         stcb->asoc.sent_queue_retran_cnt = audit;
3424 #endif
3425                                 }
3426                         }
3427                 }
3428                 break;
3429         case SCTP_ASCONF:
3430                 {
3431                         struct sctp_tmit_chunk *asconf;
3432
3433                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3434                             sctp_next) {
3435                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3436                                         break;
3437                                 }
3438                         }
3439                         if (asconf) {
3440                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3441                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3442                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3443                                 asconf->snd_count--;
3444                         }
3445                 }
3446                 break;
3447         case SCTP_INITIATION:
3448                 /* resend the INIT */
3449                 stcb->asoc.dropped_special_cnt++;
3450                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3451                         /*
3452                          * If we can get it in, in a few attempts we do
3453                          * this, otherwise we let the timer fire.
3454                          */
3455                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3456                             stcb, net,
3457                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3458                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3459                 }
3460                 break;
3461         case SCTP_SELECTIVE_ACK:
3462         case SCTP_NR_SELECTIVE_ACK:
3463                 /* resend the sack */
3464                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3465                 break;
3466         case SCTP_HEARTBEAT_REQUEST:
3467                 /* resend a demand HB */
3468                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3469                         /*
3470                          * Only retransmit if we KNOW we wont destroy the
3471                          * tcb
3472                          */
3473                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3474                 }
3475                 break;
3476         case SCTP_SHUTDOWN:
3477                 sctp_send_shutdown(stcb, net);
3478                 break;
3479         case SCTP_SHUTDOWN_ACK:
3480                 sctp_send_shutdown_ack(stcb, net);
3481                 break;
3482         case SCTP_COOKIE_ECHO:
3483                 {
3484                         struct sctp_tmit_chunk *cookie;
3485
3486                         cookie = NULL;
3487                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3488                             sctp_next) {
3489                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3490                                         break;
3491                                 }
3492                         }
3493                         if (cookie) {
3494                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3495                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3496                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3497                                 sctp_stop_all_cookie_timers(stcb);
3498                         }
3499                 }
3500                 break;
3501         case SCTP_COOKIE_ACK:
3502                 sctp_send_cookie_ack(stcb);
3503                 break;
3504         case SCTP_ASCONF_ACK:
3505                 /* resend last asconf ack */
3506                 sctp_send_asconf_ack(stcb);
3507                 break;
3508         case SCTP_IFORWARD_CUM_TSN:
3509         case SCTP_FORWARD_CUM_TSN:
3510                 send_forward_tsn(stcb, &stcb->asoc);
3511                 break;
3512                 /* can't do anything with these */
3513         case SCTP_PACKET_DROPPED:
3514         case SCTP_INITIATION_ACK:       /* this should not happen */
3515         case SCTP_HEARTBEAT_ACK:
3516         case SCTP_ABORT_ASSOCIATION:
3517         case SCTP_OPERATION_ERROR:
3518         case SCTP_SHUTDOWN_COMPLETE:
3519         case SCTP_ECN_ECHO:
3520         case SCTP_ECN_CWR:
3521         default:
3522                 break;
3523         }
3524         return (0);
3525 }
3526
3527 void
3528 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3529 {
3530         uint32_t i;
3531         uint16_t temp;
3532
3533         /*
3534          * We set things to 0xffffffff since this is the last delivered
3535          * sequence and we will be sending in 0 after the reset.
3536          */
3537
3538         if (number_entries) {
3539                 for (i = 0; i < number_entries; i++) {
3540                         temp = ntohs(list[i]);
3541                         if (temp >= stcb->asoc.streamincnt) {
3542                                 continue;
3543                         }
3544                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3545                 }
3546         } else {
3547                 list = NULL;
3548                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3549                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3550                 }
3551         }
3552         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3553 }
3554
3555 static void
3556 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3557 {
3558         uint32_t i;
3559         uint16_t temp;
3560
3561         if (number_entries > 0) {
3562                 for (i = 0; i < number_entries; i++) {
3563                         temp = ntohs(list[i]);
3564                         if (temp >= stcb->asoc.streamoutcnt) {
3565                                 /* no such stream */
3566                                 continue;
3567                         }
3568                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3569                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3570                 }
3571         } else {
3572                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3573                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3574                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3575                 }
3576         }
3577         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3578 }
3579
3580 static void
3581 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3582 {
3583         uint32_t i;
3584         uint16_t temp;
3585
3586         if (number_entries > 0) {
3587                 for (i = 0; i < number_entries; i++) {
3588                         temp = ntohs(list[i]);
3589                         if (temp >= stcb->asoc.streamoutcnt) {
3590                                 /* no such stream */
3591                                 continue;
3592                         }
3593                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3594                 }
3595         } else {
3596                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3597                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3598                 }
3599         }
3600 }
3601
3602
3603 struct sctp_stream_reset_request *
3604 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3605 {
3606         struct sctp_association *asoc;
3607         struct sctp_chunkhdr *ch;
3608         struct sctp_stream_reset_request *r;
3609         struct sctp_tmit_chunk *chk;
3610         int len, clen;
3611
3612         asoc = &stcb->asoc;
3613         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3614                 asoc->stream_reset_outstanding = 0;
3615                 return (NULL);
3616         }
3617         if (stcb->asoc.str_reset == NULL) {
3618                 asoc->stream_reset_outstanding = 0;
3619                 return (NULL);
3620         }
3621         chk = stcb->asoc.str_reset;
3622         if (chk->data == NULL) {
3623                 return (NULL);
3624         }
3625         if (bchk) {
3626                 /* he wants a copy of the chk pointer */
3627                 *bchk = chk;
3628         }
3629         clen = chk->send_size;
3630         ch = mtod(chk->data, struct sctp_chunkhdr *);
3631         r = (struct sctp_stream_reset_request *)(ch + 1);
3632         if (ntohl(r->request_seq) == seq) {
3633                 /* found it */
3634                 return (r);
3635         }
3636         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3637         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3638                 /* move to the next one, there can only be a max of two */
3639                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3640                 if (ntohl(r->request_seq) == seq) {
3641                         return (r);
3642                 }
3643         }
3644         /* that seq is not here */
3645         return (NULL);
3646 }
3647
3648 static void
3649 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3650 {
3651         struct sctp_association *asoc;
3652         struct sctp_tmit_chunk *chk;
3653
3654         asoc = &stcb->asoc;
3655         chk = asoc->str_reset;
3656         if (chk == NULL) {
3657                 return;
3658         }
3659         asoc->str_reset = NULL;
3660         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3661             NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3662         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3663         asoc->ctrl_queue_cnt--;
3664         if (chk->data) {
3665                 sctp_m_freem(chk->data);
3666                 chk->data = NULL;
3667         }
3668         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3669 }
3670
3671
3672 static int
3673 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3674     uint32_t seq, uint32_t action,
3675     struct sctp_stream_reset_response *respin)
3676 {
3677         uint16_t type;
3678         int lparam_len;
3679         struct sctp_association *asoc = &stcb->asoc;
3680         struct sctp_tmit_chunk *chk;
3681         struct sctp_stream_reset_request *req_param;
3682         struct sctp_stream_reset_out_request *req_out_param;
3683         struct sctp_stream_reset_in_request *req_in_param;
3684         uint32_t number_entries;
3685
3686         if (asoc->stream_reset_outstanding == 0) {
3687                 /* duplicate */
3688                 return (0);
3689         }
3690         if (seq == stcb->asoc.str_reset_seq_out) {
3691                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3692                 if (req_param != NULL) {
3693                         stcb->asoc.str_reset_seq_out++;
3694                         type = ntohs(req_param->ph.param_type);
3695                         lparam_len = ntohs(req_param->ph.param_length);
3696                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3697                                 int no_clear = 0;
3698
3699                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3700                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3701                                 asoc->stream_reset_out_is_outstanding = 0;
3702                                 if (asoc->stream_reset_outstanding)
3703                                         asoc->stream_reset_outstanding--;
3704                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3705                                         /* do it */
3706                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3707                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3708                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3709                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3710                                         /*
3711                                          * Set it up so we don't stop
3712                                          * retransmitting
3713                                          */
3714                                         asoc->stream_reset_outstanding++;
3715                                         stcb->asoc.str_reset_seq_out--;
3716                                         asoc->stream_reset_out_is_outstanding = 1;
3717                                         no_clear = 1;
3718                                 } else {
3719                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3720                                 }
3721                                 if (no_clear == 0) {
3722                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3723                                 }
3724                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3725                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3726                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3727                                 if (asoc->stream_reset_outstanding)
3728                                         asoc->stream_reset_outstanding--;
3729                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3730                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3731                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3732                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3733                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3734                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3735                                 }
3736                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3737                                 /* Ok we now may have more streams */
3738                                 int num_stream;
3739
3740                                 num_stream = stcb->asoc.strm_pending_add_size;
3741                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3742                                         /* TSNH */
3743                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3744                                 }
3745                                 stcb->asoc.strm_pending_add_size = 0;
3746                                 if (asoc->stream_reset_outstanding)
3747                                         asoc->stream_reset_outstanding--;
3748                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3749                                         /* Put the new streams into effect */
3750                                         int i;
3751
3752                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3753                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3754                                         }
3755                                         asoc->streamoutcnt += num_stream;
3756                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3757                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3758                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3759                                             SCTP_STREAM_CHANGE_DENIED);
3760                                 } else {
3761                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3762                                             SCTP_STREAM_CHANGE_FAILED);
3763                                 }
3764                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3765                                 if (asoc->stream_reset_outstanding)
3766                                         asoc->stream_reset_outstanding--;
3767                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3768                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3769                                             SCTP_STREAM_CHANGE_DENIED);
3770                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3771                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3772                                             SCTP_STREAM_CHANGE_FAILED);
3773                                 }
3774                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3775                                 /**
3776                                  * a) Adopt the new in tsn.
3777                                  * b) reset the map
3778                                  * c) Adopt the new out-tsn
3779                                  */
3780                                 struct sctp_stream_reset_response_tsn *resp;
3781                                 struct sctp_forward_tsn_chunk fwdtsn;
3782                                 int abort_flag = 0;
3783
3784                                 if (respin == NULL) {
3785                                         /* huh ? */
3786                                         return (0);
3787                                 }
3788                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3789                                         return (0);
3790                                 }
3791                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3792                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3793                                         asoc->stream_reset_outstanding--;
3794                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3795                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3796                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3797                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3798                                         if (abort_flag) {
3799                                                 return (1);
3800                                         }
3801                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3802                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3803                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3804                                         }
3805
3806                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3807                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3808                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3809
3810                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3811                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3812
3813                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3814                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3815
3816                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3817                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3818                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3819                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3820                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3821                                             SCTP_ASSOC_RESET_DENIED);
3822                                 } else {
3823                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3824                                             SCTP_ASSOC_RESET_FAILED);
3825                                 }
3826                         }
3827                         /* get rid of the request and get the request flags */
3828                         if (asoc->stream_reset_outstanding == 0) {
3829                                 sctp_clean_up_stream_reset(stcb);
3830                         }
3831                 }
3832         }
3833         if (asoc->stream_reset_outstanding == 0) {
3834                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3835         }
3836         return (0);
3837 }
3838
3839 static void
3840 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3841     struct sctp_tmit_chunk *chk,
3842     struct sctp_stream_reset_in_request *req, int trunc)
3843 {
3844         uint32_t seq;
3845         int len, i;
3846         int number_entries;
3847         uint16_t temp;
3848
3849         /*
3850          * peer wants me to send a str-reset to him for my outgoing seq's if
3851          * seq_in is right.
3852          */
3853         struct sctp_association *asoc = &stcb->asoc;
3854
3855         seq = ntohl(req->request_seq);
3856         if (asoc->str_reset_seq_in == seq) {
3857                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3858                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3859                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3860                 } else if (trunc) {
3861                         /* Can't do it, since they exceeded our buffer size  */
3862                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3863                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3864                         len = ntohs(req->ph.param_length);
3865                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3866                         if (number_entries) {
3867                                 for (i = 0; i < number_entries; i++) {
3868                                         temp = ntohs(req->list_of_streams[i]);
3869                                         if (temp >= stcb->asoc.streamoutcnt) {
3870                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3871                                                 goto bad_boy;
3872                                         }
3873                                         req->list_of_streams[i] = temp;
3874                                 }
3875                                 for (i = 0; i < number_entries; i++) {
3876                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3877                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3878                                         }
3879                                 }
3880                         } else {
3881                                 /* Its all */
3882                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3883                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3884                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3885                                 }
3886                         }
3887                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3888                 } else {
3889                         /* Can't do it, since we have sent one out */
3890                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3891                 }
3892 bad_boy:
3893                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3894                 asoc->str_reset_seq_in++;
3895         } else if (asoc->str_reset_seq_in - 1 == seq) {
3896                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3897         } else if (asoc->str_reset_seq_in - 2 == seq) {
3898                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3899         } else {
3900                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3901         }
3902         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3903 }
3904
3905 static int
3906 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3907     struct sctp_tmit_chunk *chk,
3908     struct sctp_stream_reset_tsn_request *req)
3909 {
3910         /* reset all in and out and update the tsn */
3911         /*
3912          * A) reset my str-seq's on in and out. B) Select a receive next,
3913          * and set cum-ack to it. Also process this selected number as a
3914          * fwd-tsn as well. C) set in the response my next sending seq.
3915          */
3916         struct sctp_forward_tsn_chunk fwdtsn;
3917         struct sctp_association *asoc = &stcb->asoc;
3918         int abort_flag = 0;
3919         uint32_t seq;
3920
3921         seq = ntohl(req->request_seq);
3922         if (asoc->str_reset_seq_in == seq) {
3923                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3924                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3925                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3926                 } else {
3927                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3928                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3929                         fwdtsn.ch.chunk_flags = 0;
3930                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3931                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3932                         if (abort_flag) {
3933                                 return (1);
3934                         }
3935                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3936                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3937                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3938                         }
3939                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3940                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3941                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3942                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3943                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3944                         atomic_add_int(&asoc->sending_seq, 1);
3945                         /* save off historical data for retrans */
3946                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3947                         asoc->last_sending_seq[0] = asoc->sending_seq;
3948                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3949                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3950                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3951                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3952                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3953                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3954                 }
3955                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3956                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3957                 asoc->str_reset_seq_in++;
3958         } else if (asoc->str_reset_seq_in - 1 == seq) {
3959                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3960                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3961         } else if (asoc->str_reset_seq_in - 2 == seq) {
3962                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3963                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3964         } else {
3965                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3966         }
3967         return (0);
3968 }
3969
3970 static void
3971 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3972     struct sctp_tmit_chunk *chk,
3973     struct sctp_stream_reset_out_request *req, int trunc)
3974 {
3975         uint32_t seq, tsn;
3976         int number_entries, len;
3977         struct sctp_association *asoc = &stcb->asoc;
3978
3979         seq = ntohl(req->request_seq);
3980
3981         /* now if its not a duplicate we process it */
3982         if (asoc->str_reset_seq_in == seq) {
3983                 len = ntohs(req->ph.param_length);
3984                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3985                 /*
3986                  * the sender is resetting, handle the list issue.. we must
3987                  * a) verify if we can do the reset, if so no problem b) If
3988                  * we can't do the reset we must copy the request. c) queue
3989                  * it, and setup the data in processor to trigger it off
3990                  * when needed and dequeue all the queued data.
3991                  */
3992                 tsn = ntohl(req->send_reset_at_tsn);
3993
3994                 /* move the reset action back one */
3995                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3996                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3997                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3998                 } else if (trunc) {
3999                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4000                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
4001                         /* we can do it now */
4002                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
4003                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4004                 } else {
4005                         /*
4006                          * we must queue it up and thus wait for the TSN's
4007                          * to arrive that are at or before tsn
4008                          */
4009                         struct sctp_stream_reset_list *liste;
4010                         int siz;
4011
4012                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
4013                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
4014                             siz, SCTP_M_STRESET);
4015                         if (liste == NULL) {
4016                                 /* gak out of memory */
4017                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4018                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4019                                 return;
4020                         }
4021                         liste->seq = seq;
4022                         liste->tsn = tsn;
4023                         liste->number_entries = number_entries;
4024                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
4025                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
4026                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
4027                 }
4028                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4029                 asoc->str_reset_seq_in++;
4030         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4031                 /*
4032                  * one seq back, just echo back last action since my
4033                  * response was lost.
4034                  */
4035                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4036         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4037                 /*
4038                  * two seq back, just echo back last action since my
4039                  * response was lost.
4040                  */
4041                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4042         } else {
4043                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4044         }
4045 }
4046
4047 static void
4048 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4049     struct sctp_stream_reset_add_strm *str_add)
4050 {
4051         /*
4052          * Peer is requesting to add more streams. If its within our
4053          * max-streams we will allow it.
4054          */
4055         uint32_t num_stream, i;
4056         uint32_t seq;
4057         struct sctp_association *asoc = &stcb->asoc;
4058         struct sctp_queued_to_read *ctl, *nctl;
4059
4060         /* Get the number. */
4061         seq = ntohl(str_add->request_seq);
4062         num_stream = ntohs(str_add->number_of_streams);
4063         /* Now what would be the new total? */
4064         if (asoc->str_reset_seq_in == seq) {
4065                 num_stream += stcb->asoc.streamincnt;
4066                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4067                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4068                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4069                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4070                     (num_stream > 0xffff)) {
4071                         /* We must reject it they ask for to many */
4072         denied:
4073                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4074                 } else {
4075                         /* Ok, we can do that :-) */
4076                         struct sctp_stream_in *oldstrm;
4077
4078                         /* save off the old */
4079                         oldstrm = stcb->asoc.strmin;
4080                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4081                             (num_stream * sizeof(struct sctp_stream_in)),
4082                             SCTP_M_STRMI);
4083                         if (stcb->asoc.strmin == NULL) {
4084                                 stcb->asoc.strmin = oldstrm;
4085                                 goto denied;
4086                         }
4087                         /* copy off the old data */
4088                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4089                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4090                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4091                                 stcb->asoc.strmin[i].sid = i;
4092                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
4093                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4094                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
4095                                 /* now anything on those queues? */
4096                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
4097                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
4098                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
4099                                 }
4100                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
4101                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
4102                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
4103                                 }
4104                         }
4105                         /* Init the new streams */
4106                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4107                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4108                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4109                                 stcb->asoc.strmin[i].sid = i;
4110                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
4111                                 stcb->asoc.strmin[i].pd_api_started = 0;
4112                                 stcb->asoc.strmin[i].delivery_started = 0;
4113                         }
4114                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4115                         /* update the size */
4116                         stcb->asoc.streamincnt = num_stream;
4117                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4118                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4119                 }
4120                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4121                 asoc->str_reset_seq_in++;
4122         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4123                 /*
4124                  * one seq back, just echo back last action since my
4125                  * response was lost.
4126                  */
4127                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4128         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4129                 /*
4130                  * two seq back, just echo back last action since my
4131                  * response was lost.
4132                  */
4133                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4134         } else {
4135                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4136
4137         }
4138 }
4139
4140 static void
4141 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4142     struct sctp_stream_reset_add_strm *str_add)
4143 {
4144         /*
4145          * Peer is requesting to add more streams. If its within our
4146          * max-streams we will allow it.
4147          */
4148         uint16_t num_stream;
4149         uint32_t seq;
4150         struct sctp_association *asoc = &stcb->asoc;
4151
4152         /* Get the number. */
4153         seq = ntohl(str_add->request_seq);
4154         num_stream = ntohs(str_add->number_of_streams);
4155         /* Now what would be the new total? */
4156         if (asoc->str_reset_seq_in == seq) {
4157                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4158                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4159                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4160                 } else if (stcb->asoc.stream_reset_outstanding) {
4161                         /* We must reject it we have something pending */
4162                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4163                 } else {
4164                         /* Ok, we can do that :-) */
4165                         int mychk;
4166
4167                         mychk = stcb->asoc.streamoutcnt;
4168                         mychk += num_stream;
4169                         if (mychk < 0x10000) {
4170                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4171                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4172                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4173                                 }
4174                         } else {
4175                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4176                         }
4177                 }
4178                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4179                 asoc->str_reset_seq_in++;
4180         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4181                 /*
4182                  * one seq back, just echo back last action since my
4183                  * response was lost.
4184                  */
4185                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4186         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4187                 /*
4188                  * two seq back, just echo back last action since my
4189                  * response was lost.
4190                  */
4191                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4192         } else {
4193                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4194         }
4195 }
4196
4197 #ifdef __GNUC__
4198 __attribute__((noinline))
4199 #endif
4200 static int
4201 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4202     struct sctp_chunkhdr *ch_req)
4203 {
4204         uint16_t remaining_length, param_len, ptype;
4205         struct sctp_paramhdr pstore;
4206         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4207         uint32_t seq = 0;
4208         int num_req = 0;
4209         int trunc = 0;
4210         struct sctp_tmit_chunk *chk;
4211         struct sctp_chunkhdr *ch;
4212         struct sctp_paramhdr *ph;
4213         int ret_code = 0;
4214         int num_param = 0;
4215
4216         /* now it may be a reset or a reset-response */
4217         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4218
4219         /* setup for adding the response */
4220         sctp_alloc_a_chunk(stcb, chk);
4221         if (chk == NULL) {
4222                 return (ret_code);
4223         }
4224         chk->copy_by_ref = 0;
4225         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4226         chk->rec.chunk_id.can_take_data = 0;
4227         chk->flags = 0;
4228         chk->asoc = &stcb->asoc;
4229         chk->no_fr_allowed = 0;
4230         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4231         chk->book_size_scale = 0;
4232         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4233         if (chk->data == NULL) {
4234 strres_nochunk:
4235                 if (chk->data) {
4236                         sctp_m_freem(chk->data);
4237                         chk->data = NULL;
4238                 }
4239                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4240                 return (ret_code);
4241         }
4242         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4243
4244         /* setup chunk parameters */
4245         chk->sent = SCTP_DATAGRAM_UNSENT;
4246         chk->snd_count = 0;
4247         chk->whoTo = NULL;
4248
4249         ch = mtod(chk->data, struct sctp_chunkhdr *);
4250         ch->chunk_type = SCTP_STREAM_RESET;
4251         ch->chunk_flags = 0;
4252         ch->chunk_length = htons(chk->send_size);
4253         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4254         offset += sizeof(struct sctp_chunkhdr);
4255         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4256                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4257                 if (ph == NULL) {
4258                         /* TSNH */
4259                         break;
4260                 }
4261                 param_len = ntohs(ph->param_length);
4262                 if ((param_len > remaining_length) ||
4263                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4264                         /* bad parameter length */
4265                         break;
4266                 }
4267                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4268                     (uint8_t *)&cstore);
4269                 if (ph == NULL) {
4270                         /* TSNH */
4271                         break;
4272                 }
4273                 ptype = ntohs(ph->param_type);
4274                 num_param++;
4275                 if (param_len > sizeof(cstore)) {
4276                         trunc = 1;
4277                 } else {
4278                         trunc = 0;
4279                 }
4280                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4281                         /* hit the max of parameters already sorry.. */
4282                         break;
4283                 }
4284                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4285                         struct sctp_stream_reset_out_request *req_out;
4286
4287                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4288                                 break;
4289                         }
4290                         req_out = (struct sctp_stream_reset_out_request *)ph;
4291                         num_req++;
4292                         if (stcb->asoc.stream_reset_outstanding) {
4293                                 seq = ntohl(req_out->response_seq);
4294                                 if (seq == stcb->asoc.str_reset_seq_out) {
4295                                         /* implicit ack */
4296                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4297                                 }
4298                         }
4299                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4300                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4301                         struct sctp_stream_reset_add_strm *str_add;
4302
4303                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4304                                 break;
4305                         }
4306                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4307                         num_req++;
4308                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4309                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4310                         struct sctp_stream_reset_add_strm *str_add;
4311
4312                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4313                                 break;
4314                         }
4315                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4316                         num_req++;
4317                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4318                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4319                         struct sctp_stream_reset_in_request *req_in;
4320
4321                         num_req++;
4322                         req_in = (struct sctp_stream_reset_in_request *)ph;
4323                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4324                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4325                         struct sctp_stream_reset_tsn_request *req_tsn;
4326
4327                         num_req++;
4328                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4329                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4330                                 ret_code = 1;
4331                                 goto strres_nochunk;
4332                         }
4333                         /* no more */
4334                         break;
4335                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4336                         struct sctp_stream_reset_response *resp;
4337                         uint32_t result;
4338
4339                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4340                                 break;
4341                         }
4342                         resp = (struct sctp_stream_reset_response *)ph;
4343                         seq = ntohl(resp->response_seq);
4344                         result = ntohl(resp->result);
4345                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4346                                 ret_code = 1;
4347                                 goto strres_nochunk;
4348                         }
4349                 } else {
4350                         break;
4351                 }
4352                 offset += SCTP_SIZE32(param_len);
4353                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4354                         remaining_length -= SCTP_SIZE32(param_len);
4355                 } else {
4356                         remaining_length = 0;
4357                 }
4358         }
4359         if (num_req == 0) {
4360                 /* we have no response free the stuff */
4361                 goto strres_nochunk;
4362         }
4363         /* ok we have a chunk to link in */
4364         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4365             chk,
4366             sctp_next);
4367         stcb->asoc.ctrl_queue_cnt++;
4368         return (ret_code);
4369 }
4370
4371 /*
4372  * Handle a router or endpoints report of a packet loss, there are two ways
4373  * to handle this, either we get the whole packet and must disect it
4374  * ourselves (possibly with truncation and or corruption) or it is a summary
4375  * from a middle box that did the disectting for us.
4376  */
4377 static void
4378 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4379     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4380 {
4381         uint32_t bottle_bw, on_queue;
4382         uint16_t trunc_len;
4383         unsigned int chlen;
4384         unsigned int at;
4385         struct sctp_chunk_desc desc;
4386         struct sctp_chunkhdr *ch;
4387
4388         chlen = ntohs(cp->ch.chunk_length);
4389         chlen -= sizeof(struct sctp_pktdrop_chunk);
4390         /* XXX possible chlen underflow */
4391         if (chlen == 0) {
4392                 ch = NULL;
4393                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4394                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4395         } else {
4396                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4397                 chlen -= sizeof(struct sctphdr);
4398                 /* XXX possible chlen underflow */
4399                 memset(&desc, 0, sizeof(desc));
4400         }
4401         trunc_len = (uint16_t)ntohs(cp->trunc_len);
4402         if (trunc_len > limit) {
4403                 trunc_len = limit;
4404         }
4405
4406         /* now the chunks themselves */
4407         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4408                 desc.chunk_type = ch->chunk_type;
4409                 /* get amount we need to move */
4410                 at = ntohs(ch->chunk_length);
4411                 if (at < sizeof(struct sctp_chunkhdr)) {
4412                         /* corrupt chunk, maybe at the end? */
4413                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4414                         break;
4415                 }
4416                 if (trunc_len == 0) {
4417                         /* we are supposed to have all of it */
4418                         if (at > chlen) {
4419                                 /* corrupt skip it */
4420                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4421                                 break;
4422                         }
4423                 } else {
4424                         /* is there enough of it left ? */
4425                         if (desc.chunk_type == SCTP_DATA) {
4426                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4427                                     sizeof(desc.data_bytes))) {
4428                                         break;
4429                                 }
4430                         } else {
4431                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4432                                         break;
4433                                 }
4434                         }
4435                 }
4436                 if (desc.chunk_type == SCTP_DATA) {
4437                         /* can we get out the tsn? */
4438                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4439                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4440
4441                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4442                                 /* yep */
4443                                 struct sctp_data_chunk *dcp;
4444                                 uint8_t *ddp;
4445                                 unsigned int iii;
4446
4447                                 dcp = (struct sctp_data_chunk *)ch;
4448                                 ddp = (uint8_t *)(dcp + 1);
4449                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4450                                         desc.data_bytes[iii] = ddp[iii];
4451                                 }
4452                                 desc.tsn_ifany = dcp->dp.tsn;
4453                         } else {
4454                                 /* nope we are done. */
4455                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4456                                 break;
4457                         }
4458                 } else {
4459                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4460                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4461                 }
4462
4463                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4464                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4465                         break;
4466                 }
4467                 if (SCTP_SIZE32(at) > chlen) {
4468                         break;
4469                 }
4470                 chlen -= SCTP_SIZE32(at);
4471                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4472                         /* done, none left */
4473                         break;
4474                 }
4475                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4476         }
4477         /* Now update any rwnd --- possibly */
4478         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4479                 /* From a peer, we get a rwnd report */
4480                 uint32_t a_rwnd;
4481
4482                 SCTP_STAT_INCR(sctps_pdrpfehos);
4483
4484                 bottle_bw = ntohl(cp->bottle_bw);
4485                 on_queue = ntohl(cp->current_onq);
4486                 if (bottle_bw && on_queue) {
4487                         /* a rwnd report is in here */
4488                         if (bottle_bw > on_queue)
4489                                 a_rwnd = bottle_bw - on_queue;
4490                         else
4491                                 a_rwnd = 0;
4492
4493                         if (a_rwnd == 0)
4494                                 stcb->asoc.peers_rwnd = 0;
4495                         else {
4496                                 if (a_rwnd > stcb->asoc.total_flight) {
4497                                         stcb->asoc.peers_rwnd =
4498                                             a_rwnd - stcb->asoc.total_flight;
4499                                 } else {
4500                                         stcb->asoc.peers_rwnd = 0;
4501                                 }
4502                                 if (stcb->asoc.peers_rwnd <
4503                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4504                                         /* SWS sender side engages */
4505                                         stcb->asoc.peers_rwnd = 0;
4506                                 }
4507                         }
4508                 }
4509         } else {
4510                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4511         }
4512
4513         /* now middle boxes in sat networks get a cwnd bump */
4514         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4515             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4516             (stcb->asoc.sat_network)) {
4517                 /*
4518                  * This is debatable but for sat networks it makes sense
4519                  * Note if a T3 timer has went off, we will prohibit any
4520                  * changes to cwnd until we exit the t3 loss recovery.
4521                  */
4522                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4523                     net, cp, &bottle_bw, &on_queue);
4524         }
4525 }
4526
4527 /*
4528  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4529  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4530  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4531  * length of the complete packet outputs: - length: modified to remaining
4532  * length after control processing - netp: modified to new sctp_nets after
4533  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4534  * bad packet,...) otherwise return the tcb for this packet
4535  */
4536 #ifdef __GNUC__
4537 __attribute__((noinline))
4538 #endif
4539 static struct sctp_tcb *
4540 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4541     struct sockaddr *src, struct sockaddr *dst,
4542     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4543     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4544     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4545     uint32_t vrf_id, uint16_t port)
4546 {
4547         struct sctp_association *asoc;
4548         struct mbuf *op_err;
4549         char msg[SCTP_DIAG_INFO_LEN];
4550         uint32_t vtag_in;
4551         int num_chunks = 0;     /* number of control chunks processed */
4552         uint32_t chk_length, contiguous;
4553         int ret;
4554         int abort_no_unlock = 0;
4555         int ecne_seen = 0;
4556
4557         /*
4558          * How big should this be, and should it be alloc'd? Lets try the
4559          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4560          * until we get into jumbo grams and such..
4561          */
4562         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4563         int got_auth = 0;
4564         uint32_t auth_offset = 0, auth_len = 0;
4565         int auth_skipped = 0;
4566         int asconf_cnt = 0;
4567 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4568         struct socket *so;
4569 #endif
4570
4571         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4572             iphlen, *offset, length, (void *)stcb);
4573
4574         if (stcb) {
4575                 SCTP_TCB_LOCK_ASSERT(stcb);
4576         }
4577         /* validate chunk header length... */
4578         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4579                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4580                     ntohs(ch->chunk_length));
4581                 *offset = length;
4582                 return (stcb);
4583         }
4584         /*
4585          * validate the verification tag
4586          */
4587         vtag_in = ntohl(sh->v_tag);
4588
4589         if (ch->chunk_type == SCTP_INITIATION) {
4590                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4591                     ntohs(ch->chunk_length), vtag_in);
4592                 if (vtag_in != 0) {
4593                         /* protocol error- silently discard... */
4594                         SCTP_STAT_INCR(sctps_badvtag);
4595                         if (stcb != NULL) {
4596                                 SCTP_TCB_UNLOCK(stcb);
4597                         }
4598                         return (NULL);
4599                 }
4600         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4601                 /*
4602                  * If there is no stcb, skip the AUTH chunk and process
4603                  * later after a stcb is found (to validate the lookup was
4604                  * valid.
4605                  */
4606                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4607                     (stcb == NULL) &&
4608                     (inp->auth_supported == 1)) {
4609                         /* save this chunk for later processing */
4610                         auth_skipped = 1;
4611                         auth_offset = *offset;
4612                         auth_len = ntohs(ch->chunk_length);
4613
4614                         /* (temporarily) move past this chunk */
4615                         *offset += SCTP_SIZE32(auth_len);
4616                         if (*offset >= length) {
4617                                 /* no more data left in the mbuf chain */
4618                                 *offset = length;
4619                                 return (NULL);
4620                         }
4621                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4622                             sizeof(struct sctp_chunkhdr), chunk_buf);
4623                 }
4624                 if (ch == NULL) {
4625                         /* Help */
4626                         *offset = length;
4627                         return (stcb);
4628                 }
4629                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4630                         goto process_control_chunks;
4631                 }
4632                 /*
4633                  * first check if it's an ASCONF with an unknown src addr we
4634                  * need to look inside to find the association
4635                  */
4636                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4637                         struct sctp_chunkhdr *asconf_ch = ch;
4638                         uint32_t asconf_offset = 0, asconf_len = 0;
4639
4640                         /* inp's refcount may be reduced */
4641                         SCTP_INP_INCR_REF(inp);
4642
4643                         asconf_offset = *offset;
4644                         do {
4645                                 asconf_len = ntohs(asconf_ch->chunk_length);
4646                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4647                                         break;
4648                                 stcb = sctp_findassociation_ep_asconf(m,
4649                                     *offset,
4650                                     dst,
4651                                     sh, &inp, netp, vrf_id);
4652                                 if (stcb != NULL)
4653                                         break;
4654                                 asconf_offset += SCTP_SIZE32(asconf_len);
4655                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4656                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4657                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4658                         if (stcb == NULL) {
4659                                 /*
4660                                  * reduce inp's refcount if not reduced in
4661                                  * sctp_findassociation_ep_asconf().
4662                                  */
4663                                 SCTP_INP_DECR_REF(inp);
4664                         }
4665
4666                         /* now go back and verify any auth chunk to be sure */
4667                         if (auth_skipped && (stcb != NULL)) {
4668                                 struct sctp_auth_chunk *auth;
4669
4670                                 auth = (struct sctp_auth_chunk *)
4671                                     sctp_m_getptr(m, auth_offset,
4672                                     auth_len, chunk_buf);
4673                                 got_auth = 1;
4674                                 auth_skipped = 0;
4675                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4676                                     auth_offset)) {
4677                                         /* auth HMAC failed so dump it */
4678                                         *offset = length;
4679                                         return (stcb);
4680                                 } else {
4681                                         /* remaining chunks are HMAC checked */
4682                                         stcb->asoc.authenticated = 1;
4683                                 }
4684                         }
4685                 }
4686                 if (stcb == NULL) {
4687                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4688                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4689                             msg);
4690                         /* no association, so it's out of the blue... */
4691                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4692                             mflowtype, mflowid, inp->fibnum,
4693                             vrf_id, port);
4694                         *offset = length;
4695                         return (NULL);
4696                 }
4697                 asoc = &stcb->asoc;
4698                 /* ABORT and SHUTDOWN can use either v_tag... */
4699                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4700                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4701                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4702                         /* Take the T-bit always into account. */
4703                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4704                             (vtag_in == asoc->my_vtag)) ||
4705                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4706                             (asoc->peer_vtag != htonl(0)) &&
4707                             (vtag_in == asoc->peer_vtag))) {
4708                                 /* this is valid */
4709                         } else {
4710                                 /* drop this packet... */
4711                                 SCTP_STAT_INCR(sctps_badvtag);
4712                                 if (stcb != NULL) {
4713                                         SCTP_TCB_UNLOCK(stcb);
4714                                 }
4715                                 return (NULL);
4716                         }
4717                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4718                         if (vtag_in != asoc->my_vtag) {
4719                                 /*
4720                                  * this could be a stale SHUTDOWN-ACK or the
4721                                  * peer never got the SHUTDOWN-COMPLETE and
4722                                  * is still hung; we have started a new asoc
4723                                  * but it won't complete until the shutdown
4724                                  * is completed
4725                                  */
4726                                 if (stcb != NULL) {
4727                                         SCTP_TCB_UNLOCK(stcb);
4728                                 }
4729                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4730                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4731                                     msg);
4732                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4733                                     sh, inp, op_err,
4734                                     mflowtype, mflowid, fibnum,
4735                                     vrf_id, port);
4736                                 return (NULL);
4737                         }
4738                 } else {
4739                         /* for all other chunks, vtag must match */
4740                         if (vtag_in != asoc->my_vtag) {
4741                                 /* invalid vtag... */
4742                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4743                                     "invalid vtag: %xh, expect %xh\n",
4744                                     vtag_in, asoc->my_vtag);
4745                                 SCTP_STAT_INCR(sctps_badvtag);
4746                                 if (stcb != NULL) {
4747                                         SCTP_TCB_UNLOCK(stcb);
4748                                 }
4749                                 *offset = length;
4750                                 return (NULL);
4751                         }
4752                 }
4753         }                       /* end if !SCTP_COOKIE_ECHO */
4754         /*
4755          * process all control chunks...
4756          */
4757         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4758             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4759             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4760             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4761                 /* implied cookie-ack.. we must have lost the ack */
4762                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4763                     *netp);
4764         }
4765
4766 process_control_chunks:
4767         while (IS_SCTP_CONTROL(ch)) {
4768                 /* validate chunk length */
4769                 chk_length = ntohs(ch->chunk_length);
4770                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4771                     ch->chunk_type, chk_length);
4772                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4773                 if (chk_length < sizeof(*ch) ||
4774                     (*offset + (int)chk_length) > length) {
4775                         *offset = length;
4776                         return (stcb);
4777                 }
4778                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4779                 /*
4780                  * INIT and INIT-ACK only gets the init ack "header" portion
4781                  * only because we don't have to process the peer's COOKIE.
4782                  * All others get a complete chunk.
4783                  */
4784                 switch (ch->chunk_type) {
4785                 case SCTP_INITIATION:
4786                         contiguous = sizeof(struct sctp_init_chunk);
4787                         break;
4788                 case SCTP_INITIATION_ACK:
4789                         contiguous = sizeof(struct sctp_init_ack_chunk);
4790                         break;
4791                 default:
4792                         contiguous = min(chk_length, sizeof(chunk_buf));
4793                         break;
4794                 }
4795                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4796                     contiguous,
4797                     chunk_buf);
4798                 if (ch == NULL) {
4799                         *offset = length;
4800                         if (stcb != NULL) {
4801                                 SCTP_TCB_UNLOCK(stcb);
4802                         }
4803                         return (NULL);
4804                 }
4805
4806                 num_chunks++;
4807                 /* Save off the last place we got a control from */
4808                 if (stcb != NULL) {
4809                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4810                                 /*
4811                                  * allow last_control to be NULL if
4812                                  * ASCONF... ASCONF processing will find the
4813                                  * right net later
4814                                  */
4815                                 if ((netp != NULL) && (*netp != NULL))
4816                                         stcb->asoc.last_control_chunk_from = *netp;
4817                         }
4818                 }
4819 #ifdef SCTP_AUDITING_ENABLED
4820                 sctp_audit_log(0xB0, ch->chunk_type);
4821 #endif
4822
4823                 /* check to see if this chunk required auth, but isn't */
4824                 if ((stcb != NULL) &&
4825                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4826                     !stcb->asoc.authenticated) {
4827                         /* "silently" ignore */
4828                         SCTP_STAT_INCR(sctps_recvauthmissing);
4829                         goto next_chunk;
4830                 }
4831                 switch (ch->chunk_type) {
4832                 case SCTP_INITIATION:
4833                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4834                         /* The INIT chunk must be the only chunk. */
4835                         if ((num_chunks > 1) ||
4836                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4837                                 /* RFC 4960 requires that no ABORT is sent */
4838                                 *offset = length;
4839                                 if (stcb != NULL) {
4840                                         SCTP_TCB_UNLOCK(stcb);
4841                                 }
4842                                 return (NULL);
4843                         }
4844                         /* Honor our resource limit. */
4845                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4846                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4847                                 sctp_abort_association(inp, stcb, m, iphlen,
4848                                     src, dst, sh, op_err,
4849                                     mflowtype, mflowid,
4850                                     vrf_id, port);
4851                                 *offset = length;
4852                                 return (NULL);
4853                         }
4854                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4855                             (struct sctp_init_chunk *)ch, inp,
4856                             stcb, *netp, &abort_no_unlock,
4857                             mflowtype, mflowid,
4858                             vrf_id, port);
4859                         *offset = length;
4860                         if ((!abort_no_unlock) && (stcb != NULL)) {
4861                                 SCTP_TCB_UNLOCK(stcb);
4862                         }
4863                         return (NULL);
4864                         break;
4865                 case SCTP_PAD_CHUNK:
4866                         break;
4867                 case SCTP_INITIATION_ACK:
4868                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4869                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4870                                 /* We are not interested anymore */
4871                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4872                                         ;
4873                                 } else {
4874                                         *offset = length;
4875                                         if (stcb != NULL) {
4876 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4877                                                 so = SCTP_INP_SO(inp);
4878                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4879                                                 SCTP_TCB_UNLOCK(stcb);
4880                                                 SCTP_SOCKET_LOCK(so, 1);
4881                                                 SCTP_TCB_LOCK(stcb);
4882                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4883 #endif
4884                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4885                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4886 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4887                                                 SCTP_SOCKET_UNLOCK(so, 1);
4888 #endif
4889                                         }
4890                                         return (NULL);
4891                                 }
4892                         }
4893                         /* The INIT-ACK chunk must be the only chunk. */
4894                         if ((num_chunks > 1) ||
4895                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4896                                 *offset = length;
4897                                 return (stcb);
4898                         }
4899                         if ((netp != NULL) && (*netp != NULL)) {
4900                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4901                                     src, dst, sh,
4902                                     (struct sctp_init_ack_chunk *)ch,
4903                                     stcb, *netp,
4904                                     &abort_no_unlock,
4905                                     mflowtype, mflowid,
4906                                     vrf_id);
4907                         } else {
4908                                 ret = -1;
4909                         }
4910                         *offset = length;
4911                         if (abort_no_unlock) {
4912                                 return (NULL);
4913                         }
4914                         /*
4915                          * Special case, I must call the output routine to
4916                          * get the cookie echoed
4917                          */
4918                         if ((stcb != NULL) && (ret == 0)) {
4919                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4920                         }
4921                         return (stcb);
4922                         break;
4923                 case SCTP_SELECTIVE_ACK:
4924                 case SCTP_NR_SELECTIVE_ACK:
4925                         {
4926                                 int abort_now = 0;
4927                                 uint32_t a_rwnd, cum_ack;
4928                                 uint16_t num_seg, num_nr_seg, num_dup;
4929                                 uint8_t flags;
4930                                 int offset_seg, offset_dup;
4931
4932                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4933                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4934                                 SCTP_STAT_INCR(sctps_recvsacks);
4935                                 if (stcb == NULL) {
4936                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4937                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4938                                         break;
4939                                 }
4940                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4941                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4942                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4943                                                 break;
4944                                         }
4945                                 } else {
4946                                         if (stcb->asoc.nrsack_supported == 0) {
4947                                                 goto unknown_chunk;
4948                                         }
4949                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4950                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4951                                                 break;
4952                                         }
4953                                 }
4954                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4955                                         /*-
4956                                          * If we have sent a shutdown-ack, we will pay no
4957                                          * attention to a sack sent in to us since
4958                                          * we don't care anymore.
4959                                          */
4960                                         break;
4961                                 }
4962                                 flags = ch->chunk_flags;
4963                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4964                                         struct sctp_sack_chunk *sack;
4965
4966                                         sack = (struct sctp_sack_chunk *)ch;
4967                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4968                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4969                                         num_nr_seg = 0;
4970                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4971                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4972                                         if (sizeof(struct sctp_sack_chunk) +
4973                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4974                                             num_dup * sizeof(uint32_t) != chk_length) {
4975                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4976                                                 break;
4977                                         }
4978                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4979                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4980                                 } else {
4981                                         struct sctp_nr_sack_chunk *nr_sack;
4982
4983                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4984                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4985                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4986                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4987                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4988                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4989                                         if (sizeof(struct sctp_nr_sack_chunk) +
4990                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4991                                             num_dup * sizeof(uint32_t) != chk_length) {
4992                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4993                                                 break;
4994                                         }
4995                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4996                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4997                                 }
4998                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4999                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
5000                                     cum_ack, num_seg, a_rwnd);
5001                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5002                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5003                                     (num_seg == 0) && (num_nr_seg == 0) &&
5004                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5005                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5006                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5007                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5008                                         /*
5009                                          * We have a SIMPLE sack having no
5010                                          * prior segments and data on sent
5011                                          * queue to be acked. Use the faster
5012                                          * path sack processing. We also
5013                                          * allow window update sacks with no
5014                                          * missing segments to go this way
5015                                          * too.
5016                                          */
5017                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5018                                             &abort_now, ecne_seen);
5019                                 } else {
5020                                         if ((netp != NULL) && (*netp != NULL)) {
5021                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5022                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5023                                                     cum_ack, a_rwnd, ecne_seen);
5024                                         }
5025                                 }
5026                                 if (abort_now) {
5027                                         /* ABORT signal from sack processing */
5028                                         *offset = length;
5029                                         return (NULL);
5030                                 }
5031                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5032                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5033                                     (stcb->asoc.stream_queue_cnt == 0)) {
5034                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5035                                 }
5036                                 break;
5037                         }
5038                 case SCTP_HEARTBEAT_REQUEST:
5039                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5040                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5041                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5042                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5043                                     chk_length, *netp);
5044                         }
5045                         break;
5046                 case SCTP_HEARTBEAT_ACK:
5047                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
5048                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5049                                 /* Its not ours */
5050                                 *offset = length;
5051                                 return (stcb);
5052                         }
5053                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5054                         if ((netp != NULL) && (*netp != NULL)) {
5055                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5056                                     stcb, *netp);
5057                         }
5058                         break;
5059                 case SCTP_ABORT_ASSOCIATION:
5060                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5061                             (void *)stcb);
5062                         *offset = length;
5063                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5064                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
5065                                         return (NULL);
5066                                 } else {
5067                                         return (stcb);
5068                                 }
5069                         } else {
5070                                 return (NULL);
5071                         }
5072                         break;
5073                 case SCTP_SHUTDOWN:
5074                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5075                             (void *)stcb);
5076                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5077                                 *offset = length;
5078                                 return (stcb);
5079                         }
5080                         if ((netp != NULL) && (*netp != NULL)) {
5081                                 int abort_flag = 0;
5082
5083                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5084                                     stcb, *netp, &abort_flag);
5085                                 if (abort_flag) {
5086                                         *offset = length;
5087                                         return (NULL);
5088                                 }
5089                         }
5090                         break;
5091                 case SCTP_SHUTDOWN_ACK:
5092                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
5093                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5094                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5095                         }
5096                         *offset = length;
5097                         return (NULL);
5098                         break;
5099                 case SCTP_OPERATION_ERROR:
5100                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
5101                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
5102                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
5103                                 *offset = length;
5104                                 return (NULL);
5105                         }
5106                         break;
5107                 case SCTP_COOKIE_ECHO:
5108                         SCTPDBG(SCTP_DEBUG_INPUT3,
5109                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
5110                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
5111                                 ;
5112                         } else {
5113                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5114                                         /* We are not interested anymore */
5115                         abend:
5116                                         if (stcb != NULL) {
5117                                                 SCTP_TCB_UNLOCK(stcb);
5118                                         }
5119                                         *offset = length;
5120                                         return (NULL);
5121                                 }
5122                         }
5123                         /*-
5124                          * First are we accepting? We do this again here
5125                          * since it is possible that a previous endpoint WAS
5126                          * listening responded to a INIT-ACK and then
5127                          * closed. We opened and bound.. and are now no
5128                          * longer listening.
5129                          *
5130                          * XXXGL: notes on checking listen queue length.
5131                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
5132                          *    SOLISTENING(), because a listening "UDP type"
5133                          *    socket isn't listening in terms of the socket
5134                          *    layer.  It is a normal data flow socket, that
5135                          *    can fork off new connections.  Thus, we should
5136                          *    look into sol_qlen only in case we are !UDP.
5137                          * 2) Checking sol_qlen in general requires locking
5138                          *    the socket, and this code lacks that.
5139                          */
5140                         if ((stcb == NULL) &&
5141                             (!SCTP_IS_LISTENING(inp) ||
5142                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
5143                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
5144                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5145                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5146                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5147                                         sctp_abort_association(inp, stcb, m, iphlen,
5148                                             src, dst, sh, op_err,
5149                                             mflowtype, mflowid,
5150                                             vrf_id, port);
5151                                 }
5152                                 *offset = length;
5153                                 return (NULL);
5154                         } else {
5155                                 struct mbuf *ret_buf;
5156                                 struct sctp_inpcb *linp;
5157
5158                                 if (stcb) {
5159                                         linp = NULL;
5160                                 } else {
5161                                         linp = inp;
5162                                 }
5163
5164                                 if (linp != NULL) {
5165                                         SCTP_ASOC_CREATE_LOCK(linp);
5166                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5167                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5168                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5169                                                 goto abend;
5170                                         }
5171                                 }
5172
5173                                 if (netp != NULL) {
5174                                         struct sctp_tcb *locked_stcb;
5175
5176                                         locked_stcb = stcb;
5177                                         ret_buf =
5178                                             sctp_handle_cookie_echo(m, iphlen,
5179                                             *offset,
5180                                             src, dst,
5181                                             sh,
5182                                             (struct sctp_cookie_echo_chunk *)ch,
5183                                             &inp, &stcb, netp,
5184                                             auth_skipped,
5185                                             auth_offset,
5186                                             auth_len,
5187                                             &locked_stcb,
5188                                             mflowtype,
5189                                             mflowid,
5190                                             vrf_id,
5191                                             port);
5192                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
5193                                                 SCTP_TCB_UNLOCK(locked_stcb);
5194                                         }
5195                                         if (stcb != NULL) {
5196                                                 SCTP_TCB_LOCK_ASSERT(stcb);
5197                                         }
5198                                 } else {
5199                                         ret_buf = NULL;
5200                                 }
5201                                 if (linp != NULL) {
5202                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5203                                 }
5204                                 if (ret_buf == NULL) {
5205                                         if (stcb != NULL) {
5206                                                 SCTP_TCB_UNLOCK(stcb);
5207                                         }
5208                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5209                                             "GAK, null buffer\n");
5210                                         *offset = length;
5211                                         return (NULL);
5212                                 }
5213                                 /* if AUTH skipped, see if it verified... */
5214                                 if (auth_skipped) {
5215                                         got_auth = 1;
5216                                         auth_skipped = 0;
5217                                 }
5218                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5219                                         /*
5220                                          * Restart the timer if we have
5221                                          * pending data
5222                                          */
5223                                         struct sctp_tmit_chunk *chk;
5224
5225                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5226                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5227                                 }
5228                         }
5229                         break;
5230                 case SCTP_COOKIE_ACK:
5231                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
5232                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5233                                 return (stcb);
5234                         }
5235                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5236                                 /* We are not interested anymore */
5237                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5238                                         ;
5239                                 } else if (stcb) {
5240 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5241                                         so = SCTP_INP_SO(inp);
5242                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5243                                         SCTP_TCB_UNLOCK(stcb);
5244                                         SCTP_SOCKET_LOCK(so, 1);
5245                                         SCTP_TCB_LOCK(stcb);
5246                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5247 #endif
5248                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5249                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5250 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5251                                         SCTP_SOCKET_UNLOCK(so, 1);
5252 #endif
5253                                         *offset = length;
5254                                         return (NULL);
5255                                 }
5256                         }
5257                         if ((netp != NULL) && (*netp != NULL)) {
5258                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5259                         }
5260                         break;
5261                 case SCTP_ECN_ECHO:
5262                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5263                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5264                                 /* Its not ours */
5265                                 *offset = length;
5266                                 return (stcb);
5267                         }
5268                         if (stcb->asoc.ecn_supported == 0) {
5269                                 goto unknown_chunk;
5270                         }
5271                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5272                         ecne_seen = 1;
5273                         break;
5274                 case SCTP_ECN_CWR:
5275                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5276                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5277                                 *offset = length;
5278                                 return (stcb);
5279                         }
5280                         if (stcb->asoc.ecn_supported == 0) {
5281                                 goto unknown_chunk;
5282                         }
5283                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5284                         break;
5285                 case SCTP_SHUTDOWN_COMPLETE:
5286                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5287                         /* must be first and only chunk */
5288                         if ((num_chunks > 1) ||
5289                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5290                                 *offset = length;
5291                                 return (stcb);
5292                         }
5293                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5294                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5295                                     stcb, *netp);
5296                         }
5297                         *offset = length;
5298                         return (NULL);
5299                         break;
5300                 case SCTP_ASCONF:
5301                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5302                         if (stcb != NULL) {
5303                                 if (stcb->asoc.asconf_supported == 0) {
5304                                         goto unknown_chunk;
5305                                 }
5306                                 sctp_handle_asconf(m, *offset, src,
5307                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5308                                 asconf_cnt++;
5309                         }
5310                         break;
5311                 case SCTP_ASCONF_ACK:
5312                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5313                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5314                                 /* Its not ours */
5315                                 *offset = length;
5316                                 return (stcb);
5317                         }
5318                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5319                                 if (stcb->asoc.asconf_supported == 0) {
5320                                         goto unknown_chunk;
5321                                 }
5322                                 /* He's alive so give him credit */
5323                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5324                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5325                                             stcb->asoc.overall_error_count,
5326                                             0,
5327                                             SCTP_FROM_SCTP_INPUT,
5328                                             __LINE__);
5329                                 }
5330                                 stcb->asoc.overall_error_count = 0;
5331                                 sctp_handle_asconf_ack(m, *offset,
5332                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5333                                 if (abort_no_unlock)
5334                                         return (NULL);
5335                         }
5336                         break;
5337                 case SCTP_FORWARD_CUM_TSN:
5338                 case SCTP_IFORWARD_CUM_TSN:
5339                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n");
5340                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5341                                 /* Its not ours */
5342                                 *offset = length;
5343                                 return (stcb);
5344                         }
5345
5346                         if (stcb != NULL) {
5347                                 int abort_flag = 0;
5348
5349                                 if (stcb->asoc.prsctp_supported == 0) {
5350                                         goto unknown_chunk;
5351                                 }
5352                                 *fwd_tsn_seen = 1;
5353                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5354                                         /* We are not interested anymore */
5355 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5356                                         so = SCTP_INP_SO(inp);
5357                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5358                                         SCTP_TCB_UNLOCK(stcb);
5359                                         SCTP_SOCKET_LOCK(so, 1);
5360                                         SCTP_TCB_LOCK(stcb);
5361                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5362 #endif
5363                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5364                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5365 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5366                                         SCTP_SOCKET_UNLOCK(so, 1);
5367 #endif
5368                                         *offset = length;
5369                                         return (NULL);
5370                                 }
5371                                 /*
5372                                  * For sending a SACK this looks like DATA
5373                                  * chunks.
5374                                  */
5375                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5376                                 sctp_handle_forward_tsn(stcb,
5377                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5378                                 if (abort_flag) {
5379                                         *offset = length;
5380                                         return (NULL);
5381                                 }
5382                         }
5383                         break;
5384                 case SCTP_STREAM_RESET:
5385                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5386                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5387                                 /* Its not ours */
5388                                 *offset = length;
5389                                 return (stcb);
5390                         }
5391                         if (stcb->asoc.reconfig_supported == 0) {
5392                                 goto unknown_chunk;
5393                         }
5394                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5395                                 /* stop processing */
5396                                 *offset = length;
5397                                 return (NULL);
5398                         }
5399                         break;
5400                 case SCTP_PACKET_DROPPED:
5401                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5402                         /* re-get it all please */
5403                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5404                                 /* Its not ours */
5405                                 *offset = length;
5406                                 return (stcb);
5407                         }
5408
5409                         if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5410                                 if (stcb->asoc.pktdrop_supported == 0) {
5411                                         goto unknown_chunk;
5412                                 }
5413                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5414                                     stcb, *netp,
5415                                     min(chk_length, contiguous));
5416                         }
5417                         break;
5418                 case SCTP_AUTHENTICATION:
5419                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5420                         if (stcb == NULL) {
5421                                 /* save the first AUTH for later processing */
5422                                 if (auth_skipped == 0) {
5423                                         auth_offset = *offset;
5424                                         auth_len = chk_length;
5425                                         auth_skipped = 1;
5426                                 }
5427                                 /* skip this chunk (temporarily) */
5428                                 goto next_chunk;
5429                         }
5430                         if (stcb->asoc.auth_supported == 0) {
5431                                 goto unknown_chunk;
5432                         }
5433                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5434                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5435                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5436                                 /* Its not ours */
5437                                 *offset = length;
5438                                 return (stcb);
5439                         }
5440                         if (got_auth == 1) {
5441                                 /* skip this chunk... it's already auth'd */
5442                                 goto next_chunk;
5443                         }
5444                         got_auth = 1;
5445                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5446                             m, *offset)) {
5447                                 /* auth HMAC failed so dump the packet */
5448                                 *offset = length;
5449                                 return (stcb);
5450                         } else {
5451                                 /* remaining chunks are HMAC checked */
5452                                 stcb->asoc.authenticated = 1;
5453                         }
5454                         break;
5455
5456                 default:
5457         unknown_chunk:
5458                         /* it's an unknown chunk! */
5459                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5460                                 struct sctp_gen_error_cause *cause;
5461                                 int len;
5462
5463                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5464                                     0, M_NOWAIT, 1, MT_DATA);
5465                                 if (op_err != NULL) {
5466                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5467                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5468                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5469                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5470                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5471                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5472                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5473 #ifdef SCTP_MBUF_LOGGING
5474                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5475                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5476                                                 }
5477 #endif
5478                                                 sctp_queue_op_err(stcb, op_err);
5479                                         } else {
5480                                                 sctp_m_freem(op_err);
5481                                         }
5482                                 }
5483                         }
5484                         if ((ch->chunk_type & 0x80) == 0) {
5485                                 /* discard this packet */
5486                                 *offset = length;
5487                                 return (stcb);
5488                         }       /* else skip this bad chunk and continue... */
5489                         break;
5490                 }               /* switch (ch->chunk_type) */
5491
5492
5493 next_chunk:
5494                 /* get the next chunk */
5495                 *offset += SCTP_SIZE32(chk_length);
5496                 if (*offset >= length) {
5497                         /* no more data left in the mbuf chain */
5498                         break;
5499                 }
5500                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5501                     sizeof(struct sctp_chunkhdr), chunk_buf);
5502                 if (ch == NULL) {
5503                         *offset = length;
5504                         return (stcb);
5505                 }
5506         }                       /* while */
5507
5508         if ((asconf_cnt > 0) && (stcb != NULL)) {
5509                 sctp_send_asconf_ack(stcb);
5510         }
5511         return (stcb);
5512 }
5513
5514
5515 /*
5516  * common input chunk processing (v4 and v6)
5517  */
5518 void
5519 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5520     struct sockaddr *src, struct sockaddr *dst,
5521     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5522     uint8_t compute_crc,
5523     uint8_t ecn_bits,
5524     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5525     uint32_t vrf_id, uint16_t port)
5526 {
5527         uint32_t high_tsn;
5528         int fwd_tsn_seen = 0, data_processed = 0;
5529         struct mbuf *m = *mm, *op_err;
5530         char msg[SCTP_DIAG_INFO_LEN];
5531         int un_sent;
5532         int cnt_ctrl_ready = 0;
5533         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5534         struct sctp_tcb *stcb = NULL;
5535         struct sctp_nets *net = NULL;
5536
5537         SCTP_STAT_INCR(sctps_recvdatagrams);
5538 #ifdef SCTP_AUDITING_ENABLED
5539         sctp_audit_log(0xE0, 1);
5540         sctp_auditing(0, inp, stcb, net);
5541 #endif
5542         if (compute_crc != 0) {
5543                 uint32_t check, calc_check;
5544
5545                 check = sh->checksum;
5546                 sh->checksum = 0;
5547                 calc_check = sctp_calculate_cksum(m, iphlen);
5548                 sh->checksum = check;
5549                 if (calc_check != check) {
5550                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5551                             calc_check, check, (void *)m, length, iphlen);
5552                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5553                             sh, ch, &inp, &net, vrf_id);
5554 #if defined(INET) || defined(INET6)
5555                         if ((ch->chunk_type != SCTP_INITIATION) &&
5556                             (net != NULL) && (net->port != port)) {
5557                                 if (net->port == 0) {
5558                                         /* UDP encapsulation turned on. */
5559                                         net->mtu -= sizeof(struct udphdr);
5560                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5561                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5562                                         }
5563                                 } else if (port == 0) {
5564                                         /* UDP encapsulation turned off. */
5565                                         net->mtu += sizeof(struct udphdr);
5566                                         /* XXX Update smallest_mtu */
5567                                 }
5568                                 net->port = port;
5569                         }
5570 #endif
5571                         if (net != NULL) {
5572                                 net->flowtype = mflowtype;
5573                                 net->flowid = mflowid;
5574                         }
5575                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5576                         if ((inp != NULL) && (stcb != NULL)) {
5577                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5578                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5579                         } else if ((inp != NULL) && (stcb == NULL)) {
5580                                 inp_decr = inp;
5581                         }
5582                         SCTP_STAT_INCR(sctps_badsum);
5583                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5584                         goto out;
5585                 }
5586         }
5587         /* Destination port of 0 is illegal, based on RFC4960. */
5588         if (sh->dest_port == 0) {
5589                 SCTP_STAT_INCR(sctps_hdrops);
5590                 goto out;
5591         }
5592         stcb = sctp_findassociation_addr(m, offset, src, dst,
5593             sh, ch, &inp, &net, vrf_id);
5594 #if defined(INET) || defined(INET6)
5595         if ((ch->chunk_type != SCTP_INITIATION) &&
5596             (net != NULL) && (net->port != port)) {
5597                 if (net->port == 0) {
5598                         /* UDP encapsulation turned on. */
5599                         net->mtu -= sizeof(struct udphdr);
5600                         if (stcb->asoc.smallest_mtu > net->mtu) {
5601                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5602                         }
5603                 } else if (port == 0) {
5604                         /* UDP encapsulation turned off. */
5605                         net->mtu += sizeof(struct udphdr);
5606                         /* XXX Update smallest_mtu */
5607                 }
5608                 net->port = port;
5609         }
5610 #endif
5611         if (net != NULL) {
5612                 net->flowtype = mflowtype;
5613                 net->flowid = mflowid;
5614         }
5615         if (inp == NULL) {
5616                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5617                 SCTP_STAT_INCR(sctps_noport);
5618                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5619                         goto out;
5620                 }
5621                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5622                         sctp_send_shutdown_complete2(src, dst, sh,
5623                             mflowtype, mflowid, fibnum,
5624                             vrf_id, port);
5625                         goto out;
5626                 }
5627                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5628                         goto out;
5629                 }
5630                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5631                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5632                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5633                             (ch->chunk_type != SCTP_INIT))) {
5634                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5635                                     "Out of the blue");
5636                                 sctp_send_abort(m, iphlen, src, dst,
5637                                     sh, 0, op_err,
5638                                     mflowtype, mflowid, fibnum,
5639                                     vrf_id, port);
5640                         }
5641                 }
5642                 goto out;
5643         } else if (stcb == NULL) {
5644                 inp_decr = inp;
5645         }
5646         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5647             (void *)m, iphlen, offset, length, (void *)stcb);
5648         if (stcb) {
5649                 /* always clear this before beginning a packet */
5650                 stcb->asoc.authenticated = 0;
5651                 stcb->asoc.seen_a_sack_this_pkt = 0;
5652                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5653                     (void *)stcb, stcb->asoc.state);
5654
5655                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5656                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5657                         /*-
5658                          * If we hit here, we had a ref count
5659                          * up when the assoc was aborted and the
5660                          * timer is clearing out the assoc, we should
5661                          * NOT respond to any packet.. its OOTB.
5662                          */
5663                         SCTP_TCB_UNLOCK(stcb);
5664                         stcb = NULL;
5665                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5666                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5667                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5668                             msg);
5669                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5670                             mflowtype, mflowid, inp->fibnum,
5671                             vrf_id, port);
5672                         goto out;
5673                 }
5674         }
5675         if (IS_SCTP_CONTROL(ch)) {
5676                 /* process the control portion of the SCTP packet */
5677                 /* sa_ignore NO_NULL_CHK */
5678                 stcb = sctp_process_control(m, iphlen, &offset, length,
5679                     src, dst, sh, ch,
5680                     inp, stcb, &net, &fwd_tsn_seen,
5681                     mflowtype, mflowid, fibnum,
5682                     vrf_id, port);
5683                 if (stcb) {
5684                         /*
5685                          * This covers us if the cookie-echo was there and
5686                          * it changes our INP.
5687                          */
5688                         inp = stcb->sctp_ep;
5689 #if defined(INET) || defined(INET6)
5690                         if ((ch->chunk_type != SCTP_INITIATION) &&
5691                             (net != NULL) && (net->port != port)) {
5692                                 if (net->port == 0) {
5693                                         /* UDP encapsulation turned on. */
5694                                         net->mtu -= sizeof(struct udphdr);
5695                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5696                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5697                                         }
5698                                 } else if (port == 0) {
5699                                         /* UDP encapsulation turned off. */
5700                                         net->mtu += sizeof(struct udphdr);
5701                                         /* XXX Update smallest_mtu */
5702                                 }
5703                                 net->port = port;
5704                         }
5705 #endif
5706                 }
5707         } else {
5708                 /*
5709                  * no control chunks, so pre-process DATA chunks (these
5710                  * checks are taken care of by control processing)
5711                  */
5712
5713                 /*
5714                  * if DATA only packet, and auth is required, then punt...
5715                  * can't have authenticated without any AUTH (control)
5716                  * chunks
5717                  */
5718                 if ((stcb != NULL) &&
5719                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5720                         /* "silently" ignore */
5721                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5722                         SCTP_STAT_INCR(sctps_recvauthmissing);
5723                         goto out;
5724                 }
5725                 if (stcb == NULL) {
5726                         /* out of the blue DATA chunk */
5727                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5728                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5729                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5730                             msg);
5731                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5732                             mflowtype, mflowid, fibnum,
5733                             vrf_id, port);
5734                         goto out;
5735                 }
5736                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5737                         /* v_tag mismatch! */
5738                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5739                         SCTP_STAT_INCR(sctps_badvtag);
5740                         goto out;
5741                 }
5742         }
5743
5744         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5745         if (stcb == NULL) {
5746                 /*
5747                  * no valid TCB for this packet, or we found it's a bad
5748                  * packet while processing control, or we're done with this
5749                  * packet (done or skip rest of data), so we drop it...
5750                  */
5751                 goto out;
5752         }
5753
5754         /*
5755          * DATA chunk processing
5756          */
5757         /* plow through the data chunks while length > offset */
5758
5759         /*
5760          * Rest should be DATA only.  Check authentication state if AUTH for
5761          * DATA is required.
5762          */
5763         if ((length > offset) &&
5764             (stcb != NULL) &&
5765             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5766             !stcb->asoc.authenticated) {
5767                 /* "silently" ignore */
5768                 SCTP_STAT_INCR(sctps_recvauthmissing);
5769                 SCTPDBG(SCTP_DEBUG_AUTH1,
5770                     "Data chunk requires AUTH, skipped\n");
5771                 goto trigger_send;
5772         }
5773         if (length > offset) {
5774                 int retval;
5775
5776                 /*
5777                  * First check to make sure our state is correct. We would
5778                  * not get here unless we really did have a tag, so we don't
5779                  * abort if this happens, just dump the chunk silently.
5780                  */
5781                 switch (SCTP_GET_STATE(stcb)) {
5782                 case SCTP_STATE_COOKIE_ECHOED:
5783                         /*
5784                          * we consider data with valid tags in this state
5785                          * shows us the cookie-ack was lost. Imply it was
5786                          * there.
5787                          */
5788                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5789                         break;
5790                 case SCTP_STATE_COOKIE_WAIT:
5791                         /*
5792                          * We consider OOTB any data sent during asoc setup.
5793                          */
5794                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5795                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5796                             msg);
5797                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5798                             mflowtype, mflowid, inp->fibnum,
5799                             vrf_id, port);
5800                         goto out;
5801                         /* sa_ignore NOTREACHED */
5802                         break;
5803                 case SCTP_STATE_EMPTY:  /* should not happen */
5804                 case SCTP_STATE_INUSE:  /* should not happen */
5805                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5806                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5807                 default:
5808                         goto out;
5809                         /* sa_ignore NOTREACHED */
5810                         break;
5811                 case SCTP_STATE_OPEN:
5812                 case SCTP_STATE_SHUTDOWN_SENT:
5813                         break;
5814                 }
5815                 /* plow through the data chunks while length > offset */
5816                 retval = sctp_process_data(mm, iphlen, &offset, length,
5817                     inp, stcb, net, &high_tsn);
5818                 if (retval == 2) {
5819                         /*
5820                          * The association aborted, NO UNLOCK needed since
5821                          * the association is destroyed.
5822                          */
5823                         stcb = NULL;
5824                         goto out;
5825                 }
5826                 data_processed = 1;
5827                 /*
5828                  * Anything important needs to have been m_copy'ed in
5829                  * process_data
5830                  */
5831         }
5832
5833         /* take care of ecn */
5834         if ((data_processed == 1) &&
5835             (stcb->asoc.ecn_supported == 1) &&
5836             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5837                 /* Yep, we need to add a ECNE */
5838                 sctp_send_ecn_echo(stcb, net, high_tsn);
5839         }
5840
5841         if ((data_processed == 0) && (fwd_tsn_seen)) {
5842                 int was_a_gap;
5843                 uint32_t highest_tsn;
5844
5845                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5846                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5847                 } else {
5848                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5849                 }
5850                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5851                 stcb->asoc.send_sack = 1;
5852                 sctp_sack_check(stcb, was_a_gap);
5853         } else if (fwd_tsn_seen) {
5854                 stcb->asoc.send_sack = 1;
5855         }
5856         /* trigger send of any chunks in queue... */
5857 trigger_send:
5858 #ifdef SCTP_AUDITING_ENABLED
5859         sctp_audit_log(0xE0, 2);
5860         sctp_auditing(1, inp, stcb, net);
5861 #endif
5862         SCTPDBG(SCTP_DEBUG_INPUT1,
5863             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5864             stcb->asoc.peers_rwnd,
5865             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5866             stcb->asoc.total_flight);
5867         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5868         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5869                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5870         }
5871         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5872             cnt_ctrl_ready ||
5873             stcb->asoc.trigger_reset ||
5874             ((un_sent) &&
5875             (stcb->asoc.peers_rwnd > 0 ||
5876             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5877                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5878                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5879                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5880         }
5881 #ifdef SCTP_AUDITING_ENABLED
5882         sctp_audit_log(0xE0, 3);
5883         sctp_auditing(2, inp, stcb, net);
5884 #endif
5885 out:
5886         if (stcb != NULL) {
5887                 SCTP_TCB_UNLOCK(stcb);
5888         }
5889         if (inp_decr != NULL) {
5890                 /* reduce ref-count */
5891                 SCTP_INP_WLOCK(inp_decr);
5892                 SCTP_INP_DECR_REF(inp_decr);
5893                 SCTP_INP_WUNLOCK(inp_decr);
5894         }
5895         return;
5896 }
5897
5898 #ifdef INET
5899 void
5900 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5901 {
5902         struct mbuf *m;
5903         int iphlen;
5904         uint32_t vrf_id = 0;
5905         uint8_t ecn_bits;
5906         struct sockaddr_in src, dst;
5907         struct ip *ip;
5908         struct sctphdr *sh;
5909         struct sctp_chunkhdr *ch;
5910         int length, offset;
5911         uint8_t compute_crc;
5912         uint32_t mflowid;
5913         uint8_t mflowtype;
5914         uint16_t fibnum;
5915
5916         iphlen = off;
5917         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5918                 SCTP_RELEASE_PKT(i_pak);
5919                 return;
5920         }
5921         m = SCTP_HEADER_TO_CHAIN(i_pak);
5922 #ifdef SCTP_MBUF_LOGGING
5923         /* Log in any input mbufs */
5924         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5925                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5926         }
5927 #endif
5928 #ifdef SCTP_PACKET_LOGGING
5929         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5930                 sctp_packet_log(m);
5931         }
5932 #endif
5933         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5934             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5935             m->m_pkthdr.len,
5936             if_name(m->m_pkthdr.rcvif),
5937             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5938         mflowid = m->m_pkthdr.flowid;
5939         mflowtype = M_HASHTYPE_GET(m);
5940         fibnum = M_GETFIB(m);
5941         SCTP_STAT_INCR(sctps_recvpackets);
5942         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5943         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5944         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5945         if (SCTP_BUF_LEN(m) < offset) {
5946                 if ((m = m_pullup(m, offset)) == NULL) {
5947                         SCTP_STAT_INCR(sctps_hdrops);
5948                         return;
5949                 }
5950         }
5951         ip = mtod(m, struct ip *);
5952         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5953         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5954         offset -= sizeof(struct sctp_chunkhdr);
5955         memset(&src, 0, sizeof(struct sockaddr_in));
5956         src.sin_family = AF_INET;
5957         src.sin_len = sizeof(struct sockaddr_in);
5958         src.sin_port = sh->src_port;
5959         src.sin_addr = ip->ip_src;
5960         memset(&dst, 0, sizeof(struct sockaddr_in));
5961         dst.sin_family = AF_INET;
5962         dst.sin_len = sizeof(struct sockaddr_in);
5963         dst.sin_port = sh->dest_port;
5964         dst.sin_addr = ip->ip_dst;
5965         length = ntohs(ip->ip_len);
5966         /* Validate mbuf chain length with IP payload length. */
5967         if (SCTP_HEADER_LEN(m) != length) {
5968                 SCTPDBG(SCTP_DEBUG_INPUT1,
5969                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5970                 SCTP_STAT_INCR(sctps_hdrops);
5971                 goto out;
5972         }
5973         /* SCTP does not allow broadcasts or multicasts */
5974         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5975                 goto out;
5976         }
5977         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5978                 goto out;
5979         }
5980         ecn_bits = ip->ip_tos;
5981         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5982                 SCTP_STAT_INCR(sctps_recvhwcrc);
5983                 compute_crc = 0;
5984         } else {
5985                 SCTP_STAT_INCR(sctps_recvswcrc);
5986                 compute_crc = 1;
5987         }
5988         sctp_common_input_processing(&m, iphlen, offset, length,
5989             (struct sockaddr *)&src,
5990             (struct sockaddr *)&dst,
5991             sh, ch,
5992             compute_crc,
5993             ecn_bits,
5994             mflowtype, mflowid, fibnum,
5995             vrf_id, port);
5996 out:
5997         if (m) {
5998                 sctp_m_freem(m);
5999         }
6000         return;
6001 }
6002
6003 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6004 extern int *sctp_cpuarry;
6005 #endif
6006
6007 int
6008 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6009 {
6010         struct mbuf *m;
6011         int off;
6012
6013         m = *mp;
6014         off = *offp;
6015 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6016         if (mp_ncpus > 1) {
6017                 struct ip *ip;
6018                 struct sctphdr *sh;
6019                 int offset;
6020                 int cpu_to_use;
6021                 uint32_t flowid, tag;
6022
6023                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6024                         flowid = m->m_pkthdr.flowid;
6025                 } else {
6026                         /*
6027                          * No flow id built by lower layers fix it so we
6028                          * create one.
6029                          */
6030                         offset = off + sizeof(struct sctphdr);
6031                         if (SCTP_BUF_LEN(m) < offset) {
6032                                 if ((m = m_pullup(m, offset)) == NULL) {
6033                                         SCTP_STAT_INCR(sctps_hdrops);
6034                                         return (IPPROTO_DONE);
6035                                 }
6036                         }
6037                         ip = mtod(m, struct ip *);
6038                         sh = (struct sctphdr *)((caddr_t)ip + off);
6039                         tag = htonl(sh->v_tag);
6040                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6041                         m->m_pkthdr.flowid = flowid;
6042                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
6043                 }
6044                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6045                 sctp_queue_to_mcore(m, off, cpu_to_use);
6046                 return (IPPROTO_DONE);
6047         }
6048 #endif
6049         sctp_input_with_port(m, off, 0);
6050         return (IPPROTO_DONE);
6051 }
6052 #endif