sys/netinet/sctp_input.c

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