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