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 |=
1745                                     SCTP_PCB_FLAGS_CONNECTED;
1746                                 soisconnected(stcb->sctp_socket);
1747                         }
1748                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1749                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1750                         else
1751                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1752                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1753                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1754                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1755                 } else {
1756                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1757                 }
1758                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1759                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1760                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1761                             stcb->sctp_ep, stcb, NULL);
1762                 }
1763                 sctp_stop_all_cookie_timers(stcb);
1764                 sctp_toss_old_cookies(stcb, asoc);
1765                 sctp_send_cookie_ack(stcb);
1766                 if (spec_flag) {
1767                         /*
1768                          * only if we have retrans set do we do this. What
1769                          * this call does is get only the COOKIE-ACK out and
1770                          * then when we return the normal call to
1771                          * sctp_chunk_output will get the retrans out behind
1772                          * this.
1773                          */
1774                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1775                 }
1776                 if (how_indx < sizeof(asoc->cookie_how))
1777                         asoc->cookie_how[how_indx] = 11;
1778
1779                 return (stcb);
1780         }
1781         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1782             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1783             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1784             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1785             cookie->tie_tag_peer_vtag != 0) {
1786                 struct sctpasochead *head;
1787
1788                 if (asoc->peer_supports_nat) {
1789                         /*
1790                          * This is a gross gross hack. Just call the
1791                          * cookie_new code since we are allowing a duplicate
1792                          * association. I hope this works...
1793                          */
1794                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1795                             sh, cookie, cookie_len,
1796                             inp, netp, init_src, notification,
1797                             auth_skipped, auth_offset, auth_len,
1798                             mflowtype, mflowid,
1799                             vrf_id, port));
1800                 }
1801                 /*
1802                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1803                  */
1804                 /* temp code */
1805                 if (how_indx < sizeof(asoc->cookie_how))
1806                         asoc->cookie_how[how_indx] = 12;
1807                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1808                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1809                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1810                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1811
1812                 /* notify upper layer */
1813                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1814                 atomic_add_int(&stcb->asoc.refcnt, 1);
1815                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1816                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1817                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1818                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1819                 }
1820                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1821                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1822                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1823                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1824                 }
1825                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1826                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1827                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1828                             stcb->sctp_ep, stcb, NULL);
1829
1830                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1831                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1832                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1833                 }
1834                 asoc->pre_open_streams =
1835                     ntohs(initack_cp->init.num_outbound_streams);
1836                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1837                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1838                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1839
1840                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1841
1842                 asoc->str_reset_seq_in = asoc->init_seq_number;
1843
1844                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1845                 if (asoc->mapping_array) {
1846                         memset(asoc->mapping_array, 0,
1847                             asoc->mapping_array_size);
1848                 }
1849                 if (asoc->nr_mapping_array) {
1850                         memset(asoc->nr_mapping_array, 0,
1851                             asoc->mapping_array_size);
1852                 }
1853                 SCTP_TCB_UNLOCK(stcb);
1854                 SCTP_INP_INFO_WLOCK();
1855                 SCTP_INP_WLOCK(stcb->sctp_ep);
1856                 SCTP_TCB_LOCK(stcb);
1857                 atomic_add_int(&stcb->asoc.refcnt, -1);
1858                 /* send up all the data */
1859                 SCTP_TCB_SEND_LOCK(stcb);
1860
1861                 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
1862                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1863                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1864 #if defined(SCTP_DETAILED_STR_STATS)
1865                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1866                                 asoc->strmout[i].abandoned_sent[j] = 0;
1867                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1868                         }
1869 #else
1870                         asoc->strmout[i].abandoned_sent[0] = 0;
1871                         asoc->strmout[i].abandoned_unsent[0] = 0;
1872 #endif
1873                         stcb->asoc.strmout[i].sid = i;
1874                         stcb->asoc.strmout[i].next_mid_ordered = 0;
1875                         stcb->asoc.strmout[i].next_mid_unordered = 0;
1876                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1877                 }
1878                 /* process the INIT-ACK info (my info) */
1879                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1880                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1881
1882                 /* pull from vtag hash */
1883                 LIST_REMOVE(stcb, sctp_asocs);
1884                 /* re-insert to new vtag position */
1885                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1886                     SCTP_BASE_INFO(hashasocmark))];
1887                 /*
1888                  * put it in the bucket in the vtag hash of assoc's for the
1889                  * system
1890                  */
1891                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1892
1893                 SCTP_TCB_SEND_UNLOCK(stcb);
1894                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1895                 SCTP_INP_INFO_WUNLOCK();
1896                 asoc->total_flight = 0;
1897                 asoc->total_flight_count = 0;
1898                 /* process the INIT info (peer's info) */
1899                 retval = sctp_process_init(init_cp, stcb);
1900                 if (retval < 0) {
1901                         if (how_indx < sizeof(asoc->cookie_how))
1902                                 asoc->cookie_how[how_indx] = 13;
1903
1904                         return (NULL);
1905                 }
1906                 /*
1907                  * since we did not send a HB make sure we don't double
1908                  * things
1909                  */
1910                 net->hb_responded = 1;
1911
1912                 if (sctp_load_addresses_from_init(stcb, m,
1913                     init_offset + sizeof(struct sctp_init_chunk),
1914                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1915                         if (how_indx < sizeof(asoc->cookie_how))
1916                                 asoc->cookie_how[how_indx] = 14;
1917
1918                         return (NULL);
1919                 }
1920                 /* respond with a COOKIE-ACK */
1921                 sctp_stop_all_cookie_timers(stcb);
1922                 sctp_toss_old_cookies(stcb, asoc);
1923                 sctp_send_cookie_ack(stcb);
1924                 if (how_indx < sizeof(asoc->cookie_how))
1925                         asoc->cookie_how[how_indx] = 15;
1926
1927                 return (stcb);
1928         }
1929         if (how_indx < sizeof(asoc->cookie_how))
1930                 asoc->cookie_how[how_indx] = 16;
1931         /* all other cases... */
1932         return (NULL);
1933 }
1934
1935 /*
1936  * handle a state cookie for a new association m: input packet mbuf chain--
1937  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1938  * and the cookie signature does not exist offset: offset into mbuf to the
1939  * cookie-echo chunk length: length of the cookie chunk to: where the init
1940  * was from returns a new TCB
1941  */
1942 static struct sctp_tcb *
1943 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1944     struct sockaddr *src, struct sockaddr *dst,
1945     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1946     struct sctp_inpcb *inp, struct sctp_nets **netp,
1947     struct sockaddr *init_src, int *notification,
1948     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1949     uint8_t mflowtype, uint32_t mflowid,
1950     uint32_t vrf_id, uint16_t port)
1951 {
1952         struct sctp_tcb *stcb;
1953         struct sctp_init_chunk *init_cp, init_buf;
1954         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1955         union sctp_sockstore store;
1956         struct sctp_association *asoc;
1957         int init_offset, initack_offset, initack_limit;
1958         int retval;
1959         int error = 0;
1960         uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
1961
1962         /*
1963          * find and validate the INIT chunk in the cookie (peer's info) the
1964          * INIT should start after the cookie-echo header struct (chunk
1965          * header, state cookie header struct)
1966          */
1967         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1968         init_cp = (struct sctp_init_chunk *)
1969             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1970             (uint8_t *)&init_buf);
1971         if (init_cp == NULL) {
1972                 /* could not pull a INIT chunk in cookie */
1973                 SCTPDBG(SCTP_DEBUG_INPUT1,
1974                     "process_cookie_new: could not pull INIT chunk hdr\n");
1975                 return (NULL);
1976         }
1977         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1978                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
1979                 return (NULL);
1980         }
1981         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1982         /*
1983          * find and validate the INIT-ACK chunk in the cookie (my info) the
1984          * INIT-ACK follows the INIT chunk
1985          */
1986         initack_cp = (struct sctp_init_ack_chunk *)
1987             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1988             (uint8_t *)&initack_buf);
1989         if (initack_cp == NULL) {
1990                 /* could not pull INIT-ACK chunk in cookie */
1991                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
1992                 return (NULL);
1993         }
1994         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1995                 return (NULL);
1996         }
1997         /*
1998          * NOTE: We can't use the INIT_ACK's chk_length to determine the
1999          * "initack_limit" value.  This is because the chk_length field
2000          * includes the length of the cookie, but the cookie is omitted when
2001          * the INIT and INIT_ACK are tacked onto the cookie...
2002          */
2003         initack_limit = offset + cookie_len;
2004
2005         /*
2006          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2007          * and popluate
2008          */
2009
2010         /*
2011          * Here we do a trick, we set in NULL for the proc/thread argument.
2012          * We do this since in effect we only use the p argument when the
2013          * socket is unbound and we must do an implicit bind. Since we are
2014          * getting a cookie, we cannot be unbound.
2015          */
2016         stcb = sctp_aloc_assoc(inp, init_src, &error,
2017             ntohl(initack_cp->init.initiate_tag), vrf_id,
2018             ntohs(initack_cp->init.num_outbound_streams),
2019             port,
2020             (struct thread *)NULL,
2021             SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2022         if (stcb == NULL) {
2023                 struct mbuf *op_err;
2024
2025                 /* memory problem? */
2026                 SCTPDBG(SCTP_DEBUG_INPUT1,
2027                     "process_cookie_new: no room for another TCB!\n");
2028                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2029                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2030                     src, dst, sh, op_err,
2031                     mflowtype, mflowid,
2032                     vrf_id, port);
2033                 return (NULL);
2034         }
2035         asoc = &stcb->asoc;
2036         /* get scope variables out of cookie */
2037         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2038         asoc->scope.site_scope = cookie->site_scope;
2039         asoc->scope.local_scope = cookie->local_scope;
2040         asoc->scope.loopback_scope = cookie->loopback_scope;
2041
2042         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2043             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2044                 struct mbuf *op_err;
2045
2046                 /*
2047                  * Houston we have a problem. The EP changed while the
2048                  * cookie was in flight. Only recourse is to abort the
2049                  * association.
2050                  */
2051                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2052                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2053                     src, dst, sh, op_err,
2054                     mflowtype, mflowid,
2055                     vrf_id, port);
2056                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2057                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2058                 return (NULL);
2059         }
2060         /* process the INIT-ACK info (my info) */
2061         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2062         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2063         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2064         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2065         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2066         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2067         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2068         asoc->str_reset_seq_in = asoc->init_seq_number;
2069
2070         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2071
2072         /* process the INIT info (peer's info) */
2073         retval = sctp_process_init(init_cp, stcb);
2074         if (retval < 0) {
2075                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2076                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2077                 return (NULL);
2078         }
2079         /* load all addresses */
2080         if (sctp_load_addresses_from_init(stcb, m,
2081             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2082             src, dst, init_src, port)) {
2083                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2084                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2085                 return (NULL);
2086         }
2087         /*
2088          * verify any preceding AUTH chunk that was skipped
2089          */
2090         /* pull the local authentication parameters from the cookie/init-ack */
2091         sctp_auth_get_cookie_params(stcb, m,
2092             initack_offset + sizeof(struct sctp_init_ack_chunk),
2093             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2094         if (auth_skipped) {
2095                 struct sctp_auth_chunk *auth;
2096
2097                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
2098                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2099                 } else {
2100                         auth = NULL;
2101                 }
2102                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2103                         /* auth HMAC failed, dump the assoc and packet */
2104                         SCTPDBG(SCTP_DEBUG_AUTH1,
2105                             "COOKIE-ECHO: AUTH failed\n");
2106                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2107                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2108                         return (NULL);
2109                 } else {
2110                         /* remaining chunks checked... good to go */
2111                         stcb->asoc.authenticated = 1;
2112                 }
2113         }
2114
2115         /*
2116          * if we're doing ASCONFs, check to see if we have any new local
2117          * addresses that need to get added to the peer (eg. addresses
2118          * changed while cookie echo in flight).  This needs to be done
2119          * after we go to the OPEN state to do the correct asconf
2120          * processing. else, make sure we have the correct addresses in our
2121          * lists
2122          */
2123
2124         /* warning, we re-use sin, sin6, sa_store here! */
2125         /* pull in local_address (our "from" address) */
2126         switch (cookie->laddr_type) {
2127 #ifdef INET
2128         case SCTP_IPV4_ADDRESS:
2129                 /* source addr is IPv4 */
2130                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2131                 store.sin.sin_family = AF_INET;
2132                 store.sin.sin_len = sizeof(struct sockaddr_in);
2133                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2134                 break;
2135 #endif
2136 #ifdef INET6
2137         case SCTP_IPV6_ADDRESS:
2138                 /* source addr is IPv6 */
2139                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2140                 store.sin6.sin6_family = AF_INET6;
2141                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2142                 store.sin6.sin6_scope_id = cookie->scope_id;
2143                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2144                 break;
2145 #endif
2146         default:
2147                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2148                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2149                 return (NULL);
2150         }
2151
2152         /* update current state */
2153         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2154         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2155         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2156                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2157                     stcb->sctp_ep, stcb, NULL);
2158         }
2159         sctp_stop_all_cookie_timers(stcb);
2160         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2161         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2162
2163         /* set up to notify upper layer */
2164         *notification = SCTP_NOTIFY_ASSOC_UP;
2165         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2166             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2167             (!SCTP_IS_LISTENING(inp))) {
2168                 /*
2169                  * This is an endpoint that called connect() how it got a
2170                  * cookie that is NEW is a bit of a mystery. It must be that
2171                  * the INIT was sent, but before it got there.. a complete
2172                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2173                  * should have went to the other code.. not here.. oh well..
2174                  * a bit of protection is worth having..
2175                  */
2176                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2177                 soisconnected(stcb->sctp_socket);
2178         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2179             (SCTP_IS_LISTENING(inp))) {
2180                 /*
2181                  * We don't want to do anything with this one. Since it is
2182                  * the listening guy. The timer will get started for
2183                  * accepted connections in the caller.
2184                  */
2185                 ;
2186         }
2187         if (stcb->asoc.sctp_autoclose_ticks &&
2188             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2189                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2190         }
2191         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2192         *netp = sctp_findnet(stcb, init_src);
2193         if (*netp != NULL) {
2194                 struct timeval old;
2195
2196                 /*
2197                  * Since we did not send a HB, make sure we don't double
2198                  * things.
2199                  */
2200                 (*netp)->hb_responded = 1;
2201                 /* Calculate the RTT. */
2202                 old.tv_sec = cookie->time_entered.tv_sec;
2203                 old.tv_usec = cookie->time_entered.tv_usec;
2204                 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
2205         }
2206         /* respond with a COOKIE-ACK */
2207         sctp_send_cookie_ack(stcb);
2208
2209         /*
2210          * check the address lists for any ASCONFs that need to be sent
2211          * AFTER the cookie-ack is sent
2212          */
2213         sctp_check_address_list(stcb, m,
2214             initack_offset + sizeof(struct sctp_init_ack_chunk),
2215             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2216             &store.sa, cookie->local_scope, cookie->site_scope,
2217             cookie->ipv4_scope, cookie->loopback_scope);
2218
2219         return (stcb);
2220 }
2221
2222 /*
2223  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2224  * we NEED to make sure we are not already using the vtag. If so we
2225  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2226         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2227                                                             SCTP_BASE_INFO(hashasocmark))];
2228         LIST_FOREACH(stcb, head, sctp_asocs) {
2229                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2230                        -- SEND ABORT - TRY AGAIN --
2231                 }
2232         }
2233 */
2234
2235 /*
2236  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2237  * existing (non-NULL) TCB
2238  */
2239 static struct mbuf *
2240 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2241     struct sockaddr *src, struct sockaddr *dst,
2242     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2243     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2244     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2245     struct sctp_tcb **locked_tcb,
2246     uint8_t mflowtype, uint32_t mflowid,
2247     uint32_t vrf_id, uint16_t port)
2248 {
2249         struct sctp_state_cookie *cookie;
2250         struct sctp_tcb *l_stcb = *stcb;
2251         struct sctp_inpcb *l_inp;
2252         struct sockaddr *to;
2253         struct sctp_pcb *ep;
2254         struct mbuf *m_sig;
2255         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2256         uint8_t *sig;
2257         uint8_t cookie_ok = 0;
2258         unsigned int sig_offset, cookie_offset;
2259         unsigned int cookie_len;
2260         struct timeval now;
2261         struct timeval time_expires;
2262         int notification = 0;
2263         struct sctp_nets *netl;
2264         int had_a_existing_tcb = 0;
2265         int send_int_conf = 0;
2266 #ifdef INET
2267         struct sockaddr_in sin;
2268 #endif
2269 #ifdef INET6
2270         struct sockaddr_in6 sin6;
2271 #endif
2272
2273         SCTPDBG(SCTP_DEBUG_INPUT2,
2274             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2275
2276         if (inp_p == NULL) {
2277                 return (NULL);
2278         }
2279         cookie = &cp->cookie;
2280         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2281         cookie_len = ntohs(cp->ch.chunk_length);
2282
2283         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2284             sizeof(struct sctp_init_chunk) +
2285             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2286                 /* cookie too small */
2287                 return (NULL);
2288         }
2289         if ((cookie->peerport != sh->src_port) ||
2290             (cookie->myport != sh->dest_port) ||
2291             (cookie->my_vtag != sh->v_tag)) {
2292                 /*
2293                  * invalid ports or bad tag.  Note that we always leave the
2294                  * v_tag in the header in network order and when we stored
2295                  * it in the my_vtag slot we also left it in network order.
2296                  * This maintains the match even though it may be in the
2297                  * opposite byte order of the machine :->
2298                  */
2299                 return (NULL);
2300         }
2301         /*
2302          * split off the signature into its own mbuf (since it should not be
2303          * calculated in the sctp_hmac_m() call).
2304          */
2305         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2306         m_sig = m_split(m, sig_offset, M_NOWAIT);
2307         if (m_sig == NULL) {
2308                 /* out of memory or ?? */
2309                 return (NULL);
2310         }
2311 #ifdef SCTP_MBUF_LOGGING
2312         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2313                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2314         }
2315 #endif
2316
2317         /*
2318          * compute the signature/digest for the cookie
2319          */
2320         ep = &(*inp_p)->sctp_ep;
2321         l_inp = *inp_p;
2322         if (l_stcb) {
2323                 SCTP_TCB_UNLOCK(l_stcb);
2324         }
2325         SCTP_INP_RLOCK(l_inp);
2326         if (l_stcb) {
2327                 SCTP_TCB_LOCK(l_stcb);
2328         }
2329         /* which cookie is it? */
2330         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2331             (ep->current_secret_number != ep->last_secret_number)) {
2332                 /* it's the old cookie */
2333                 (void)sctp_hmac_m(SCTP_HMAC,
2334                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2335                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2336         } else {
2337                 /* it's the current cookie */
2338                 (void)sctp_hmac_m(SCTP_HMAC,
2339                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2340                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2341         }
2342         /* get the signature */
2343         SCTP_INP_RUNLOCK(l_inp);
2344         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2345         if (sig == NULL) {
2346                 /* couldn't find signature */
2347                 sctp_m_freem(m_sig);
2348                 return (NULL);
2349         }
2350         /* compare the received digest with the computed digest */
2351         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2352                 /* try the old cookie? */
2353                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2354                     (ep->current_secret_number != ep->last_secret_number)) {
2355                         /* compute digest with old */
2356                         (void)sctp_hmac_m(SCTP_HMAC,
2357                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2358                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2359                         /* compare */
2360                         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2361                                 cookie_ok = 1;
2362                 }
2363         } else {
2364                 cookie_ok = 1;
2365         }
2366
2367         /*
2368          * Now before we continue we must reconstruct our mbuf so that
2369          * normal processing of any other chunks will work.
2370          */
2371         {
2372                 struct mbuf *m_at;
2373
2374                 m_at = m;
2375                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2376                         m_at = SCTP_BUF_NEXT(m_at);
2377                 }
2378                 SCTP_BUF_NEXT(m_at) = m_sig;
2379         }
2380
2381         if (cookie_ok == 0) {
2382                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2383                 SCTPDBG(SCTP_DEBUG_INPUT2,
2384                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2385                     (uint32_t)offset, cookie_offset, sig_offset);
2386                 return (NULL);
2387         }
2388
2389         /*
2390          * check the cookie timestamps to be sure it's not stale
2391          */
2392         (void)SCTP_GETTIME_TIMEVAL(&now);
2393         /* Expire time is in Ticks, so we convert to seconds */
2394         time_expires.tv_sec = cookie->time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
2395         time_expires.tv_usec = cookie->time_entered.tv_usec;
2396         if (timevalcmp(&now, &time_expires, >)) {
2397                 /* cookie is stale! */
2398                 struct mbuf *op_err;
2399                 struct sctp_error_stale_cookie *cause;
2400                 struct timeval diff;
2401                 uint32_t staleness;
2402
2403                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2404                     0, M_NOWAIT, 1, MT_DATA);
2405                 if (op_err == NULL) {
2406                         /* FOOBAR */
2407                         return (NULL);
2408                 }
2409                 /* Set the len */
2410                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2411                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2412                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2413                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2414                     (sizeof(uint32_t))));
2415                 diff = now;
2416                 timevalsub(&diff, &time_expires);
2417                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2418                         staleness = UINT32_MAX;
2419                 } else {
2420                         staleness = diff.tv_sec * 1000000;
2421                 }
2422                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2423                         staleness += diff.tv_usec;
2424                 } else {
2425                         staleness = UINT32_MAX;
2426                 }
2427                 cause->stale_time = htonl(staleness);
2428                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2429                     mflowtype, mflowid, l_inp->fibnum,
2430                     vrf_id, port);
2431                 return (NULL);
2432         }
2433         /*
2434          * Now we must see with the lookup address if we have an existing
2435          * asoc. This will only happen if we were in the COOKIE-WAIT state
2436          * and a INIT collided with us and somewhere the peer sent the
2437          * cookie on another address besides the single address our assoc
2438          * had for him. In this case we will have one of the tie-tags set at
2439          * least AND the address field in the cookie can be used to look it
2440          * up.
2441          */
2442         to = NULL;
2443         switch (cookie->addr_type) {
2444 #ifdef INET6
2445         case SCTP_IPV6_ADDRESS:
2446                 memset(&sin6, 0, sizeof(sin6));
2447                 sin6.sin6_family = AF_INET6;
2448                 sin6.sin6_len = sizeof(sin6);
2449                 sin6.sin6_port = sh->src_port;
2450                 sin6.sin6_scope_id = cookie->scope_id;
2451                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2452                     sizeof(sin6.sin6_addr.s6_addr));
2453                 to = (struct sockaddr *)&sin6;
2454                 break;
2455 #endif
2456 #ifdef INET
2457         case SCTP_IPV4_ADDRESS:
2458                 memset(&sin, 0, sizeof(sin));
2459                 sin.sin_family = AF_INET;
2460                 sin.sin_len = sizeof(sin);
2461                 sin.sin_port = sh->src_port;
2462                 sin.sin_addr.s_addr = cookie->address[0];
2463                 to = (struct sockaddr *)&sin;
2464                 break;
2465 #endif
2466         default:
2467                 /* This should not happen */
2468                 return (NULL);
2469         }
2470         if (*stcb == NULL) {
2471                 /* Yep, lets check */
2472                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2473                 if (*stcb == NULL) {
2474                         /*
2475                          * We should have only got back the same inp. If we
2476                          * got back a different ep we have a problem. The
2477                          * original findep got back l_inp and now
2478                          */
2479                         if (l_inp != *inp_p) {
2480                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2481                         }
2482                 } else {
2483                         if (*locked_tcb == NULL) {
2484                                 /*
2485                                  * In this case we found the assoc only
2486                                  * after we locked the create lock. This
2487                                  * means we are in a colliding case and we
2488                                  * must make sure that we unlock the tcb if
2489                                  * its one of the cases where we throw away
2490                                  * the incoming packets.
2491                                  */
2492                                 *locked_tcb = *stcb;
2493
2494                                 /*
2495                                  * We must also increment the inp ref count
2496                                  * since the ref_count flags was set when we
2497                                  * did not find the TCB, now we found it
2498                                  * which reduces the refcount.. we must
2499                                  * raise it back out to balance it all :-)
2500                                  */
2501                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2502                                 if ((*stcb)->sctp_ep != l_inp) {
2503                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2504                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2505                                 }
2506                         }
2507                 }
2508         }
2509
2510         cookie_len -= SCTP_SIGNATURE_SIZE;
2511         if (*stcb == NULL) {
2512                 /* this is the "normal" case... get a new TCB */
2513                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2514                     cookie, cookie_len, *inp_p,
2515                     netp, to, &notification,
2516                     auth_skipped, auth_offset, auth_len,
2517                     mflowtype, mflowid,
2518                     vrf_id, port);
2519         } else {
2520                 /* this is abnormal... cookie-echo on existing TCB */
2521                 had_a_existing_tcb = 1;
2522                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2523                     src, dst, sh,
2524                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2525                     &notification, auth_skipped, auth_offset, auth_len,
2526                     mflowtype, mflowid,
2527                     vrf_id, port);
2528         }
2529
2530         if (*stcb == NULL) {
2531                 /* still no TCB... must be bad cookie-echo */
2532                 return (NULL);
2533         }
2534         if (*netp != NULL) {
2535                 (*netp)->flowtype = mflowtype;
2536                 (*netp)->flowid = mflowid;
2537         }
2538         /*
2539          * Ok, we built an association so confirm the address we sent the
2540          * INIT-ACK to.
2541          */
2542         netl = sctp_findnet(*stcb, to);
2543         /*
2544          * This code should in theory NOT run but
2545          */
2546         if (netl == NULL) {
2547                 /* TSNH! Huh, why do I need to add this address here? */
2548                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2549                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2550                         return (NULL);
2551                 }
2552                 netl = sctp_findnet(*stcb, to);
2553         }
2554         if (netl) {
2555                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2556                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2557                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2558                             netl);
2559                         send_int_conf = 1;
2560                 }
2561         }
2562         sctp_start_net_timers(*stcb);
2563         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2564                 if (!had_a_existing_tcb ||
2565                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2566                         /*
2567                          * If we have a NEW cookie or the connect never
2568                          * reached the connected state during collision we
2569                          * must do the TCP accept thing.
2570                          */
2571                         struct socket *so, *oso;
2572                         struct sctp_inpcb *inp;
2573
2574                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2575                                 /*
2576                                  * For a restart we will keep the same
2577                                  * socket, no need to do anything. I THINK!!
2578                                  */
2579                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2580                                 if (send_int_conf) {
2581                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2582                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2583                                 }
2584                                 return (m);
2585                         }
2586                         oso = (*inp_p)->sctp_socket;
2587                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2588                         SCTP_TCB_UNLOCK((*stcb));
2589                         CURVNET_SET(oso->so_vnet);
2590                         so = sonewconn(oso, 0
2591                             );
2592                         CURVNET_RESTORE();
2593                         SCTP_TCB_LOCK((*stcb));
2594                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2595
2596                         if (so == NULL) {
2597                                 struct mbuf *op_err;
2598
2599                                 /* Too many sockets */
2600                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2601                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2602                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2603                                     src, dst, sh, op_err,
2604                                     mflowtype, mflowid,
2605                                     vrf_id, port);
2606                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2607                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2608                                 return (NULL);
2609                         }
2610                         inp = (struct sctp_inpcb *)so->so_pcb;
2611                         SCTP_INP_INCR_REF(inp);
2612                         /*
2613                          * We add the unbound flag here so that if we get an
2614                          * soabort() before we get the move_pcb done, we
2615                          * will properly cleanup.
2616                          */
2617                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2618                             SCTP_PCB_FLAGS_CONNECTED |
2619                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2620                             SCTP_PCB_FLAGS_UNBOUND |
2621                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2622                             SCTP_PCB_FLAGS_DONT_WAKE);
2623                         inp->sctp_features = (*inp_p)->sctp_features;
2624                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2625                         inp->sctp_socket = so;
2626                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2627                         inp->max_cwnd = (*inp_p)->max_cwnd;
2628                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2629                         inp->ecn_supported = (*inp_p)->ecn_supported;
2630                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2631                         inp->auth_supported = (*inp_p)->auth_supported;
2632                         inp->asconf_supported = (*inp_p)->asconf_supported;
2633                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2634                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2635                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2636                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2637                         inp->sctp_context = (*inp_p)->sctp_context;
2638                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2639                         inp->fibnum = (*inp_p)->fibnum;
2640                         inp->inp_starting_point_for_iterator = NULL;
2641                         /*
2642                          * copy in the authentication parameters from the
2643                          * original endpoint
2644                          */
2645                         if (inp->sctp_ep.local_hmacs)
2646                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2647                         inp->sctp_ep.local_hmacs =
2648                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2649                         if (inp->sctp_ep.local_auth_chunks)
2650                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2651                         inp->sctp_ep.local_auth_chunks =
2652                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2653
2654                         /*
2655                          * Now we must move it from one hash table to
2656                          * another and get the tcb in the right place.
2657                          */
2658
2659                         /*
2660                          * This is where the one-2-one socket is put into
2661                          * the accept state waiting for the accept!
2662                          */
2663                         if (*stcb) {
2664                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2665                         }
2666                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2667
2668                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2669                         SCTP_TCB_UNLOCK((*stcb));
2670
2671                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2672                             0);
2673                         SCTP_TCB_LOCK((*stcb));
2674                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2675
2676                         /*
2677                          * now we must check to see if we were aborted while
2678                          * the move was going on and the lock/unlock
2679                          * happened.
2680                          */
2681                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2682                                 /*
2683                                  * yep it was, we leave the assoc attached
2684                                  * to the socket since the sctp_inpcb_free()
2685                                  * call will send an abort for us.
2686                                  */
2687                                 SCTP_INP_DECR_REF(inp);
2688                                 return (NULL);
2689                         }
2690                         SCTP_INP_DECR_REF(inp);
2691                         /* Switch over to the new guy */
2692                         *inp_p = inp;
2693                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2694                         if (send_int_conf) {
2695                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2696                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2697                         }
2698
2699                         /*
2700                          * Pull it from the incomplete queue and wake the
2701                          * guy
2702                          */
2703                         soisconnected(so);
2704                         return (m);
2705                 }
2706         }
2707         if (notification) {
2708                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2709         }
2710         if (send_int_conf) {
2711                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2712                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2713         }
2714         return (m);
2715 }
2716
2717 static void
2718 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2719     struct sctp_tcb *stcb, struct sctp_nets *net)
2720 {
2721         /* cp must not be used, others call this without a c-ack :-) */
2722         struct sctp_association *asoc;
2723         struct sctp_tmit_chunk *chk;
2724
2725         SCTPDBG(SCTP_DEBUG_INPUT2,
2726             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2727         if ((stcb == NULL) || (net == NULL)) {
2728                 return;
2729         }
2730
2731         asoc = &stcb->asoc;
2732         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2733                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2734                     asoc->overall_error_count,
2735                     0,
2736                     SCTP_FROM_SCTP_INPUT,
2737                     __LINE__);
2738         }
2739         asoc->overall_error_count = 0;
2740         sctp_stop_all_cookie_timers(stcb);
2741         /* process according to association state */
2742         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2743                 /* state change only needed when I am in right state */
2744                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2745                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2746                 sctp_start_net_timers(stcb);
2747                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2748                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2749                             stcb->sctp_ep, stcb, NULL);
2750                 }
2751                 /* update RTO */
2752                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2753                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2754                 if (asoc->overall_error_count == 0) {
2755                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2756                             SCTP_RTT_FROM_NON_DATA);
2757                 }
2758                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2759                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2760                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2761                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2762                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2763                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2764                                 soisconnected(stcb->sctp_socket);
2765                         }
2766                 }
2767                 /*
2768                  * since we did not send a HB make sure we don't double
2769                  * things
2770                  */
2771                 net->hb_responded = 1;
2772
2773                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2774                         /*
2775                          * We don't need to do the asconf thing, nor hb or
2776                          * autoclose if the socket is closed.
2777                          */
2778                         goto closed_socket;
2779                 }
2780
2781                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2782                     stcb, net);
2783
2784                 if (stcb->asoc.sctp_autoclose_ticks &&
2785                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2786                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2787                             stcb->sctp_ep, stcb, NULL);
2788                 }
2789                 /*
2790                  * send ASCONF if parameters are pending and ASCONFs are
2791                  * allowed (eg. addresses changed when init/cookie echo were
2792                  * in flight)
2793                  */
2794                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2795                     (stcb->asoc.asconf_supported == 1) &&
2796                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2797 #ifdef SCTP_TIMER_BASED_ASCONF
2798                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2799                             stcb->sctp_ep, stcb,
2800                             stcb->asoc.primary_destination);
2801 #else
2802                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2803                             SCTP_ADDR_NOT_LOCKED);
2804 #endif
2805                 }
2806         }
2807 closed_socket:
2808         /* Toss the cookie if I can */
2809         sctp_toss_old_cookies(stcb, asoc);
2810         /* Restart the timer if we have pending data */
2811         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
2812                 if (chk->whoTo != NULL) {
2813                         break;
2814                 }
2815         }
2816         if (chk != NULL) {
2817                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2818         }
2819 }
2820
2821 static void
2822 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2823     struct sctp_tcb *stcb)
2824 {
2825         struct sctp_nets *net;
2826         struct sctp_tmit_chunk *lchk;
2827         struct sctp_ecne_chunk bkup;
2828         uint8_t override_bit;
2829         uint32_t tsn, window_data_tsn;
2830         int len;
2831         unsigned int pkt_cnt;
2832
2833         len = ntohs(cp->ch.chunk_length);
2834         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2835             (len != sizeof(struct old_sctp_ecne_chunk))) {
2836                 return;
2837         }
2838         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2839                 /* Its the old format */
2840                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2841                 bkup.num_pkts_since_cwr = htonl(1);
2842                 cp = &bkup;
2843         }
2844         SCTP_STAT_INCR(sctps_recvecne);
2845         tsn = ntohl(cp->tsn);
2846         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2847         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2848         if (lchk == NULL) {
2849                 window_data_tsn = stcb->asoc.sending_seq - 1;
2850         } else {
2851                 window_data_tsn = lchk->rec.data.tsn;
2852         }
2853
2854         /* Find where it was sent to if possible. */
2855         net = NULL;
2856         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2857                 if (lchk->rec.data.tsn == tsn) {
2858                         net = lchk->whoTo;
2859                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2860                         break;
2861                 }
2862                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
2863                         break;
2864                 }
2865         }
2866         if (net == NULL) {
2867                 /*
2868                  * What to do. A previous send of a CWR was possibly lost.
2869                  * See how old it is, we may have it marked on the actual
2870                  * net.
2871                  */
2872                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2873                         if (tsn == net->last_cwr_tsn) {
2874                                 /* Found him, send it off */
2875                                 break;
2876                         }
2877                 }
2878                 if (net == NULL) {
2879                         /*
2880                          * If we reach here, we need to send a special CWR
2881                          * that says hey, we did this a long time ago and
2882                          * you lost the response.
2883                          */
2884                         net = TAILQ_FIRST(&stcb->asoc.nets);
2885                         if (net == NULL) {
2886                                 /* TSNH */
2887                                 return;
2888                         }
2889                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2890                 } else {
2891                         override_bit = 0;
2892                 }
2893         } else {
2894                 override_bit = 0;
2895         }
2896         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2897             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2898                 /*
2899                  * JRS - Use the congestion control given in the pluggable
2900                  * CC module
2901                  */
2902                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2903                 /*
2904                  * We reduce once every RTT. So we will only lower cwnd at
2905                  * the next sending seq i.e. the window_data_tsn
2906                  */
2907                 net->cwr_window_tsn = window_data_tsn;
2908                 net->ecn_ce_pkt_cnt += pkt_cnt;
2909                 net->lost_cnt = pkt_cnt;
2910                 net->last_cwr_tsn = tsn;
2911         } else {
2912                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
2913                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
2914                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2915                         /*
2916                          * Another loss in the same window update how many
2917                          * marks/packets lost we have had.
2918                          */
2919                         int cnt = 1;
2920
2921                         if (pkt_cnt > net->lost_cnt) {
2922                                 /* Should be the case */
2923                                 cnt = (pkt_cnt - net->lost_cnt);
2924                                 net->ecn_ce_pkt_cnt += cnt;
2925                         }
2926                         net->lost_cnt = pkt_cnt;
2927                         net->last_cwr_tsn = tsn;
2928                         /*
2929                          * Most CC functions will ignore this call, since we
2930                          * are in-window yet of the initial CE the peer saw.
2931                          */
2932                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
2933                 }
2934         }
2935         /*
2936          * We always send a CWR this way if our previous one was lost our
2937          * peer will get an update, or if it is not time again to reduce we
2938          * still get the cwr to the peer. Note we set the override when we
2939          * could not find the TSN on the chunk or the destination network.
2940          */
2941         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
2942 }
2943
2944 static void
2945 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
2946 {
2947         /*
2948          * Here we get a CWR from the peer. We must look in the outqueue and
2949          * make sure that we have a covered ECNE in the control chunk part.
2950          * If so remove it.
2951          */
2952         struct sctp_tmit_chunk *chk, *nchk;
2953         struct sctp_ecne_chunk *ecne;
2954         int override;
2955         uint32_t cwr_tsn;
2956
2957         cwr_tsn = ntohl(cp->tsn);
2958         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
2959         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
2960                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
2961                         continue;
2962                 }
2963                 if ((override == 0) && (chk->whoTo != net)) {
2964                         /* Must be from the right src unless override is set */
2965                         continue;
2966                 }
2967                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
2968                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
2969                         /* this covers this ECNE, we can remove it */
2970                         stcb->asoc.ecn_echo_cnt_onq--;
2971                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
2972                             sctp_next);
2973                         stcb->asoc.ctrl_queue_cnt--;
2974                         sctp_m_freem(chk->data);
2975                         chk->data = NULL;
2976                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
2977                         if (override == 0) {
2978                                 break;
2979                         }
2980                 }
2981         }
2982 }
2983
2984 static void
2985 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
2986     struct sctp_tcb *stcb, struct sctp_nets *net)
2987 {
2988
2989         SCTPDBG(SCTP_DEBUG_INPUT2,
2990             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
2991         if (stcb == NULL)
2992                 return;
2993
2994         /* process according to association state */
2995         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
2996                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
2997                 SCTPDBG(SCTP_DEBUG_INPUT2,
2998                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
2999                 SCTP_TCB_UNLOCK(stcb);
3000                 return;
3001         }
3002         /* notify upper layer protocol */
3003         if (stcb->sctp_socket) {
3004                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3005         }
3006 #ifdef INVARIANTS
3007         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3008             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3009             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3010                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3011         }
3012 #endif
3013         /* stop the timer */
3014         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3015             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3016         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3017         /* free the TCB */
3018         SCTPDBG(SCTP_DEBUG_INPUT2,
3019             "sctp_handle_shutdown_complete: calls free-asoc\n");
3020         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3021             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3022         return;
3023 }
3024
3025 static int
3026 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3027     struct sctp_nets *net, uint8_t flg)
3028 {
3029         switch (desc->chunk_type) {
3030         case SCTP_DATA:
3031         case SCTP_IDATA:
3032                 /* find the tsn to resend (possibly) */
3033                 {
3034                         uint32_t tsn;
3035                         struct sctp_tmit_chunk *tp1;
3036
3037                         tsn = ntohl(desc->tsn_ifany);
3038                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3039                                 if (tp1->rec.data.tsn == tsn) {
3040                                         /* found it */
3041                                         break;
3042                                 }
3043                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3044                                         /* not found */
3045                                         tp1 = NULL;
3046                                         break;
3047                                 }
3048                         }
3049                         if (tp1 == NULL) {
3050                                 /*
3051                                  * Do it the other way , aka without paying
3052                                  * attention to queue seq order.
3053                                  */
3054                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3055                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3056                                         if (tp1->rec.data.tsn == tsn) {
3057                                                 /* found it */
3058                                                 break;
3059                                         }
3060                                 }
3061                         }
3062                         if (tp1 == NULL) {
3063                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3064                         }
3065                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3066                                 if (((flg & SCTP_BADCRC) == 0) &&
3067                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3068                                         return (0);
3069                                 }
3070                                 if ((stcb->asoc.peers_rwnd == 0) &&
3071                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3072                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3073                                         return (0);
3074                                 }
3075                                 if (stcb->asoc.peers_rwnd == 0 &&
3076                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3077                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3078                                         return (0);
3079                                 }
3080                                 if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
3081                                     SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
3082                                         /* Payload not matching. */
3083                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3084                                         return (-1);
3085                                 }
3086                                 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb),
3087                                     desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
3088                                         /* Payload not matching. */
3089                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3090                                         return (-1);
3091                                 }
3092                                 if (tp1->do_rtt) {
3093                                         /*
3094                                          * this guy had a RTO calculation
3095                                          * pending on it, cancel it
3096                                          */
3097                                         if (tp1->whoTo->rto_needed == 0) {
3098                                                 tp1->whoTo->rto_needed = 1;
3099                                         }
3100                                         tp1->do_rtt = 0;
3101                                 }
3102                                 SCTP_STAT_INCR(sctps_pdrpmark);
3103                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3104                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3105                                 /*
3106                                  * mark it as if we were doing a FR, since
3107                                  * we will be getting gap ack reports behind
3108                                  * the info from the router.
3109                                  */
3110                                 tp1->rec.data.doing_fast_retransmit = 1;
3111                                 /*
3112                                  * mark the tsn with what sequences can
3113                                  * cause a new FR.
3114                                  */
3115                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3116                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3117                                 } else {
3118                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3119                                 }
3120
3121                                 /* restart the timer */
3122                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3123                                     stcb, tp1->whoTo,
3124                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3125                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3126                                     stcb, tp1->whoTo);
3127
3128                                 /* fix counts and things */
3129                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3130                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3131                                             tp1->whoTo->flight_size,
3132                                             tp1->book_size,
3133                                             (uint32_t)(uintptr_t)stcb,
3134                                             tp1->rec.data.tsn);
3135                                 }
3136                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3137                                         sctp_flight_size_decrease(tp1);
3138                                         sctp_total_flight_decrease(stcb, tp1);
3139                                 }
3140                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3141                         } {
3142                                 /* audit code */
3143                                 unsigned int audit;
3144
3145                                 audit = 0;
3146                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3147                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3148                                                 audit++;
3149                                 }
3150                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3151                                     sctp_next) {
3152                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3153                                                 audit++;
3154                                 }
3155                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3156                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3157                                             audit, stcb->asoc.sent_queue_retran_cnt);
3158 #ifndef SCTP_AUDITING_ENABLED
3159                                         stcb->asoc.sent_queue_retran_cnt = audit;
3160 #endif
3161                                 }
3162                         }
3163                 }
3164                 break;
3165         case SCTP_ASCONF:
3166                 {
3167                         struct sctp_tmit_chunk *asconf;
3168
3169                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3170                             sctp_next) {
3171                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3172                                         break;
3173                                 }
3174                         }
3175                         if (asconf) {
3176                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3177                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3178                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3179                                 asconf->snd_count--;
3180                         }
3181                 }
3182                 break;
3183         case SCTP_INITIATION:
3184                 /* resend the INIT */
3185                 stcb->asoc.dropped_special_cnt++;
3186                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3187                         /*
3188                          * If we can get it in, in a few attempts we do
3189                          * this, otherwise we let the timer fire.
3190                          */
3191                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3192                             stcb, net,
3193                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3194                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3195                 }
3196                 break;
3197         case SCTP_SELECTIVE_ACK:
3198         case SCTP_NR_SELECTIVE_ACK:
3199                 /* resend the sack */
3200                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3201                 break;
3202         case SCTP_HEARTBEAT_REQUEST:
3203                 /* resend a demand HB */
3204                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3205                         /*
3206                          * Only retransmit if we KNOW we wont destroy the
3207                          * tcb
3208                          */
3209                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3210                 }
3211                 break;
3212         case SCTP_SHUTDOWN:
3213                 sctp_send_shutdown(stcb, net);
3214                 break;
3215         case SCTP_SHUTDOWN_ACK:
3216                 sctp_send_shutdown_ack(stcb, net);
3217                 break;
3218         case SCTP_COOKIE_ECHO:
3219                 {
3220                         struct sctp_tmit_chunk *cookie;
3221
3222                         cookie = NULL;
3223                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3224                             sctp_next) {
3225                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3226                                         break;
3227                                 }
3228                         }
3229                         if (cookie) {
3230                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3231                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3232                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3233                                 sctp_stop_all_cookie_timers(stcb);
3234                         }
3235                 }
3236                 break;
3237         case SCTP_COOKIE_ACK:
3238                 sctp_send_cookie_ack(stcb);
3239                 break;
3240         case SCTP_ASCONF_ACK:
3241                 /* resend last asconf ack */
3242                 sctp_send_asconf_ack(stcb);
3243                 break;
3244         case SCTP_IFORWARD_CUM_TSN:
3245         case SCTP_FORWARD_CUM_TSN:
3246                 send_forward_tsn(stcb, &stcb->asoc);
3247                 break;
3248                 /* can't do anything with these */
3249         case SCTP_PACKET_DROPPED:
3250         case SCTP_INITIATION_ACK:       /* this should not happen */
3251         case SCTP_HEARTBEAT_ACK:
3252         case SCTP_ABORT_ASSOCIATION:
3253         case SCTP_OPERATION_ERROR:
3254         case SCTP_SHUTDOWN_COMPLETE:
3255         case SCTP_ECN_ECHO:
3256         case SCTP_ECN_CWR:
3257         default:
3258                 break;
3259         }
3260         return (0);
3261 }
3262
3263 void
3264 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3265 {
3266         uint32_t i;
3267         uint16_t temp;
3268
3269         /*
3270          * We set things to 0xffffffff since this is the last delivered
3271          * sequence and we will be sending in 0 after the reset.
3272          */
3273
3274         if (number_entries) {
3275                 for (i = 0; i < number_entries; i++) {
3276                         temp = ntohs(list[i]);
3277                         if (temp >= stcb->asoc.streamincnt) {
3278                                 continue;
3279                         }
3280                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3281                 }
3282         } else {
3283                 list = NULL;
3284                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3285                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3286                 }
3287         }
3288         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3289 }
3290
3291 static void
3292 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3293 {
3294         uint32_t i;
3295         uint16_t temp;
3296
3297         if (number_entries > 0) {
3298                 for (i = 0; i < number_entries; i++) {
3299                         temp = ntohs(list[i]);
3300                         if (temp >= stcb->asoc.streamoutcnt) {
3301                                 /* no such stream */
3302                                 continue;
3303                         }
3304                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3305                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3306                 }
3307         } else {
3308                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3309                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3310                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3311                 }
3312         }
3313         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3314 }
3315
3316 static void
3317 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3318 {
3319         uint32_t i;
3320         uint16_t temp;
3321
3322         if (number_entries > 0) {
3323                 for (i = 0; i < number_entries; i++) {
3324                         temp = ntohs(list[i]);
3325                         if (temp >= stcb->asoc.streamoutcnt) {
3326                                 /* no such stream */
3327                                 continue;
3328                         }
3329                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3330                 }
3331         } else {
3332                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3333                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3334                 }
3335         }
3336 }
3337
3338 struct sctp_stream_reset_request *
3339 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3340 {
3341         struct sctp_association *asoc;
3342         struct sctp_chunkhdr *ch;
3343         struct sctp_stream_reset_request *r;
3344         struct sctp_tmit_chunk *chk;
3345         int len, clen;
3346
3347         asoc = &stcb->asoc;
3348         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3349                 asoc->stream_reset_outstanding = 0;
3350                 return (NULL);
3351         }
3352         if (stcb->asoc.str_reset == NULL) {
3353                 asoc->stream_reset_outstanding = 0;
3354                 return (NULL);
3355         }
3356         chk = stcb->asoc.str_reset;
3357         if (chk->data == NULL) {
3358                 return (NULL);
3359         }
3360         if (bchk) {
3361                 /* he wants a copy of the chk pointer */
3362                 *bchk = chk;
3363         }
3364         clen = chk->send_size;
3365         ch = mtod(chk->data, struct sctp_chunkhdr *);
3366         r = (struct sctp_stream_reset_request *)(ch + 1);
3367         if (ntohl(r->request_seq) == seq) {
3368                 /* found it */
3369                 return (r);
3370         }
3371         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3372         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3373                 /* move to the next one, there can only be a max of two */
3374                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3375                 if (ntohl(r->request_seq) == seq) {
3376                         return (r);
3377                 }
3378         }
3379         /* that seq is not here */
3380         return (NULL);
3381 }
3382
3383 static void
3384 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3385 {
3386         struct sctp_association *asoc;
3387         struct sctp_tmit_chunk *chk;
3388
3389         asoc = &stcb->asoc;
3390         chk = asoc->str_reset;
3391         if (chk == NULL) {
3392                 return;
3393         }
3394         asoc->str_reset = NULL;
3395         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3396             NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3397         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3398         asoc->ctrl_queue_cnt--;
3399         if (chk->data) {
3400                 sctp_m_freem(chk->data);
3401                 chk->data = NULL;
3402         }
3403         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3404 }
3405
3406 static int
3407 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3408     uint32_t seq, uint32_t action,
3409     struct sctp_stream_reset_response *respin)
3410 {
3411         uint16_t type;
3412         int lparam_len;
3413         struct sctp_association *asoc = &stcb->asoc;
3414         struct sctp_tmit_chunk *chk;
3415         struct sctp_stream_reset_request *req_param;
3416         struct sctp_stream_reset_out_request *req_out_param;
3417         struct sctp_stream_reset_in_request *req_in_param;
3418         uint32_t number_entries;
3419
3420         if (asoc->stream_reset_outstanding == 0) {
3421                 /* duplicate */
3422                 return (0);
3423         }
3424         if (seq == stcb->asoc.str_reset_seq_out) {
3425                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3426                 if (req_param != NULL) {
3427                         stcb->asoc.str_reset_seq_out++;
3428                         type = ntohs(req_param->ph.param_type);
3429                         lparam_len = ntohs(req_param->ph.param_length);
3430                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3431                                 int no_clear = 0;
3432
3433                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3434                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3435                                 asoc->stream_reset_out_is_outstanding = 0;
3436                                 if (asoc->stream_reset_outstanding)
3437                                         asoc->stream_reset_outstanding--;
3438                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3439                                         /* do it */
3440                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3441                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3442                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3443                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3444                                         /*
3445                                          * Set it up so we don't stop
3446                                          * retransmitting
3447                                          */
3448                                         asoc->stream_reset_outstanding++;
3449                                         stcb->asoc.str_reset_seq_out--;
3450                                         asoc->stream_reset_out_is_outstanding = 1;
3451                                         no_clear = 1;
3452                                 } else {
3453                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3454                                 }
3455                                 if (no_clear == 0) {
3456                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3457                                 }
3458                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3459                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3460                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3461                                 if (asoc->stream_reset_outstanding)
3462                                         asoc->stream_reset_outstanding--;
3463                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3464                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3465                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3466                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3467                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3468                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3469                                 }
3470                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3471                                 /* Ok we now may have more streams */
3472                                 int num_stream;
3473
3474                                 num_stream = stcb->asoc.strm_pending_add_size;
3475                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3476                                         /* TSNH */
3477                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3478                                 }
3479                                 stcb->asoc.strm_pending_add_size = 0;
3480                                 if (asoc->stream_reset_outstanding)
3481                                         asoc->stream_reset_outstanding--;
3482                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3483                                         /* Put the new streams into effect */
3484                                         int i;
3485
3486                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3487                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3488                                         }
3489                                         asoc->streamoutcnt += num_stream;
3490                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3491                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3492                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3493                                             SCTP_STREAM_CHANGE_DENIED);
3494                                 } else {
3495                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3496                                             SCTP_STREAM_CHANGE_FAILED);
3497                                 }
3498                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3499                                 if (asoc->stream_reset_outstanding)
3500                                         asoc->stream_reset_outstanding--;
3501                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3502                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3503                                             SCTP_STREAM_CHANGE_DENIED);
3504                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3505                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3506                                             SCTP_STREAM_CHANGE_FAILED);
3507                                 }
3508                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3509                                 /**
3510                                  * a) Adopt the new in tsn.
3511                                  * b) reset the map
3512                                  * c) Adopt the new out-tsn
3513                                  */
3514                                 struct sctp_stream_reset_response_tsn *resp;
3515                                 struct sctp_forward_tsn_chunk fwdtsn;
3516                                 int abort_flag = 0;
3517
3518                                 if (respin == NULL) {
3519                                         /* huh ? */
3520                                         return (0);
3521                                 }
3522                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3523                                         return (0);
3524                                 }
3525                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3526                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3527                                         asoc->stream_reset_outstanding--;
3528                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3529                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3530                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3531                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3532                                         if (abort_flag) {
3533                                                 return (1);
3534                                         }
3535                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3536                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3537                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3538                                         }
3539
3540                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3541                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3542                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3543
3544                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3545                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3546
3547                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3548                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3549
3550                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3551                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3552                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3553                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3554                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3555                                             SCTP_ASSOC_RESET_DENIED);
3556                                 } else {
3557                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3558                                             SCTP_ASSOC_RESET_FAILED);
3559                                 }
3560                         }
3561                         /* get rid of the request and get the request flags */
3562                         if (asoc->stream_reset_outstanding == 0) {
3563                                 sctp_clean_up_stream_reset(stcb);
3564                         }
3565                 }
3566         }
3567         if (asoc->stream_reset_outstanding == 0) {
3568                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3569         }
3570         return (0);
3571 }
3572
3573 static void
3574 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3575     struct sctp_tmit_chunk *chk,
3576     struct sctp_stream_reset_in_request *req, int trunc)
3577 {
3578         uint32_t seq;
3579         int len, i;
3580         int number_entries;
3581         uint16_t temp;
3582
3583         /*
3584          * peer wants me to send a str-reset to him for my outgoing seq's if
3585          * seq_in is right.
3586          */
3587         struct sctp_association *asoc = &stcb->asoc;
3588
3589         seq = ntohl(req->request_seq);
3590         if (asoc->str_reset_seq_in == seq) {
3591                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3592                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3593                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3594                 } else if (trunc) {
3595                         /* Can't do it, since they exceeded our buffer size  */
3596                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3597                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3598                         len = ntohs(req->ph.param_length);
3599                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3600                         if (number_entries) {
3601                                 for (i = 0; i < number_entries; i++) {
3602                                         temp = ntohs(req->list_of_streams[i]);
3603                                         if (temp >= stcb->asoc.streamoutcnt) {
3604                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3605                                                 goto bad_boy;
3606                                         }
3607                                         req->list_of_streams[i] = temp;
3608                                 }
3609                                 for (i = 0; i < number_entries; i++) {
3610                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3611                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3612                                         }
3613                                 }
3614                         } else {
3615                                 /* Its all */
3616                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3617                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3618                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3619                                 }
3620                         }
3621                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3622                 } else {
3623                         /* Can't do it, since we have sent one out */
3624                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3625                 }
3626 bad_boy:
3627                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3628                 asoc->str_reset_seq_in++;
3629         } else if (asoc->str_reset_seq_in - 1 == seq) {
3630                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3631         } else if (asoc->str_reset_seq_in - 2 == seq) {
3632                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3633         } else {
3634                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3635         }
3636         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3637 }
3638
3639 static int
3640 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3641     struct sctp_tmit_chunk *chk,
3642     struct sctp_stream_reset_tsn_request *req)
3643 {
3644         /* reset all in and out and update the tsn */
3645         /*
3646          * A) reset my str-seq's on in and out. B) Select a receive next,
3647          * and set cum-ack to it. Also process this selected number as a
3648          * fwd-tsn as well. C) set in the response my next sending seq.
3649          */
3650         struct sctp_forward_tsn_chunk fwdtsn;
3651         struct sctp_association *asoc = &stcb->asoc;
3652         int abort_flag = 0;
3653         uint32_t seq;
3654
3655         seq = ntohl(req->request_seq);
3656         if (asoc->str_reset_seq_in == seq) {
3657                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3658                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3659                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3660                 } else {
3661                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3662                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3663                         fwdtsn.ch.chunk_flags = 0;
3664                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3665                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3666                         if (abort_flag) {
3667                                 return (1);
3668                         }
3669                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3670                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3671                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3672                         }
3673                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3674                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3675                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3676                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3677                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3678                         atomic_add_int(&asoc->sending_seq, 1);
3679                         /* save off historical data for retrans */
3680                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3681                         asoc->last_sending_seq[0] = asoc->sending_seq;
3682                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3683                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3684                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3685                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3686                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3687                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3688                 }
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                 asoc->str_reset_seq_in++;
3692         } else if (asoc->str_reset_seq_in - 1 == seq) {
3693                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3694                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3695         } else if (asoc->str_reset_seq_in - 2 == seq) {
3696                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3697                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3698         } else {
3699                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3700         }
3701         return (0);
3702 }
3703
3704 static void
3705 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3706     struct sctp_tmit_chunk *chk,
3707     struct sctp_stream_reset_out_request *req, int trunc)
3708 {
3709         uint32_t seq, tsn;
3710         int number_entries, len;
3711         struct sctp_association *asoc = &stcb->asoc;
3712
3713         seq = ntohl(req->request_seq);
3714
3715         /* now if its not a duplicate we process it */
3716         if (asoc->str_reset_seq_in == seq) {
3717                 len = ntohs(req->ph.param_length);
3718                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3719                 /*
3720                  * the sender is resetting, handle the list issue.. we must
3721                  * a) verify if we can do the reset, if so no problem b) If
3722                  * we can't do the reset we must copy the request. c) queue
3723                  * it, and setup the data in processor to trigger it off
3724                  * when needed and dequeue all the queued data.
3725                  */
3726                 tsn = ntohl(req->send_reset_at_tsn);
3727
3728                 /* move the reset action back one */
3729                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3730                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3731                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3732                 } else if (trunc) {
3733                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3734                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3735                         /* we can do it now */
3736                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3737                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3738                 } else {
3739                         /*
3740                          * we must queue it up and thus wait for the TSN's
3741                          * to arrive that are at or before tsn
3742                          */
3743                         struct sctp_stream_reset_list *liste;
3744                         int siz;
3745
3746                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3747                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3748                             siz, SCTP_M_STRESET);
3749                         if (liste == NULL) {
3750                                 /* gak out of memory */
3751                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3752                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3753                                 return;
3754                         }
3755                         liste->seq = seq;
3756                         liste->tsn = tsn;
3757                         liste->number_entries = number_entries;
3758                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3759                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3760                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3761                 }
3762                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3763                 asoc->str_reset_seq_in++;
3764         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3765                 /*
3766                  * one seq back, just echo back last action since my
3767                  * response was lost.
3768                  */
3769                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3770         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3771                 /*
3772                  * two seq back, just echo back last action since my
3773                  * response was lost.
3774                  */
3775                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3776         } else {
3777                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3778         }
3779 }
3780
3781 static void
3782 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3783     struct sctp_stream_reset_add_strm *str_add)
3784 {
3785         /*
3786          * Peer is requesting to add more streams. If its within our
3787          * max-streams we will allow it.
3788          */
3789         uint32_t num_stream, i;
3790         uint32_t seq;
3791         struct sctp_association *asoc = &stcb->asoc;
3792         struct sctp_queued_to_read *ctl, *nctl;
3793
3794         /* Get the number. */
3795         seq = ntohl(str_add->request_seq);
3796         num_stream = ntohs(str_add->number_of_streams);
3797         /* Now what would be the new total? */
3798         if (asoc->str_reset_seq_in == seq) {
3799                 num_stream += stcb->asoc.streamincnt;
3800                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3801                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3802                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3803                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3804                     (num_stream > 0xffff)) {
3805                         /* We must reject it they ask for to many */
3806         denied:
3807                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3808                 } else {
3809                         /* Ok, we can do that :-) */
3810                         struct sctp_stream_in *oldstrm;
3811
3812                         /* save off the old */
3813                         oldstrm = stcb->asoc.strmin;
3814                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3815                             (num_stream * sizeof(struct sctp_stream_in)),
3816                             SCTP_M_STRMI);
3817                         if (stcb->asoc.strmin == NULL) {
3818                                 stcb->asoc.strmin = oldstrm;
3819                                 goto denied;
3820                         }
3821                         /* copy off the old data */
3822                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3823                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3824                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3825                                 stcb->asoc.strmin[i].sid = i;
3826                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
3827                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3828                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
3829                                 /* now anything on those queues? */
3830                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
3831                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
3832                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
3833                                 }
3834                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
3835                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
3836                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
3837                                 }
3838                         }
3839                         /* Init the new streams */
3840                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3841                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3842                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3843                                 stcb->asoc.strmin[i].sid = i;
3844                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3845                                 stcb->asoc.strmin[i].pd_api_started = 0;
3846                                 stcb->asoc.strmin[i].delivery_started = 0;
3847                         }
3848                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3849                         /* update the size */
3850                         stcb->asoc.streamincnt = num_stream;
3851                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3852                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3853                 }
3854                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3855                 asoc->str_reset_seq_in++;
3856         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3857                 /*
3858                  * one seq back, just echo back last action since my
3859                  * response was lost.
3860                  */
3861                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3862         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3863                 /*
3864                  * two seq back, just echo back last action since my
3865                  * response was lost.
3866                  */
3867                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3868         } else {
3869                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3870         }
3871 }
3872
3873 static void
3874 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3875     struct sctp_stream_reset_add_strm *str_add)
3876 {
3877         /*
3878          * Peer is requesting to add more streams. If its within our
3879          * max-streams we will allow it.
3880          */
3881         uint16_t num_stream;
3882         uint32_t seq;
3883         struct sctp_association *asoc = &stcb->asoc;
3884
3885         /* Get the number. */
3886         seq = ntohl(str_add->request_seq);
3887         num_stream = ntohs(str_add->number_of_streams);
3888         /* Now what would be the new total? */
3889         if (asoc->str_reset_seq_in == seq) {
3890                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3891                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3892                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3893                 } else if (stcb->asoc.stream_reset_outstanding) {
3894                         /* We must reject it we have something pending */
3895                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3896                 } else {
3897                         /* Ok, we can do that :-) */
3898                         int mychk;
3899
3900                         mychk = stcb->asoc.streamoutcnt;
3901                         mychk += num_stream;
3902                         if (mychk < 0x10000) {
3903                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3904                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
3905                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3906                                 }
3907                         } else {
3908                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3909                         }
3910                 }
3911                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
3912                 asoc->str_reset_seq_in++;
3913         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3914                 /*
3915                  * one seq back, just echo back last action since my
3916                  * response was lost.
3917                  */
3918                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3919         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3920                 /*
3921                  * two seq back, just echo back last action since my
3922                  * response was lost.
3923                  */
3924                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3925         } else {
3926                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3927         }
3928 }
3929
3930 #ifdef __GNUC__
3931 __attribute__((noinline))
3932 #endif
3933 static int
3934 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3935     struct sctp_chunkhdr *ch_req)
3936 {
3937         uint16_t remaining_length, param_len, ptype;
3938         struct sctp_paramhdr pstore;
3939         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3940         uint32_t seq = 0;
3941         int num_req = 0;
3942         int trunc = 0;
3943         struct sctp_tmit_chunk *chk;
3944         struct sctp_chunkhdr *ch;
3945         struct sctp_paramhdr *ph;
3946         int ret_code = 0;
3947         int num_param = 0;
3948
3949         /* now it may be a reset or a reset-response */
3950         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
3951
3952         /* setup for adding the response */
3953         sctp_alloc_a_chunk(stcb, chk);
3954         if (chk == NULL) {
3955                 return (ret_code);
3956         }
3957         chk->copy_by_ref = 0;
3958         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3959         chk->rec.chunk_id.can_take_data = 0;
3960         chk->flags = 0;
3961         chk->asoc = &stcb->asoc;
3962         chk->no_fr_allowed = 0;
3963         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3964         chk->book_size_scale = 0;
3965         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
3966         if (chk->data == NULL) {
3967 strres_nochunk:
3968                 if (chk->data) {
3969                         sctp_m_freem(chk->data);
3970                         chk->data = NULL;
3971                 }
3972                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3973                 return (ret_code);
3974         }
3975         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
3976
3977         /* setup chunk parameters */
3978         chk->sent = SCTP_DATAGRAM_UNSENT;
3979         chk->snd_count = 0;
3980         chk->whoTo = NULL;
3981
3982         ch = mtod(chk->data, struct sctp_chunkhdr *);
3983         ch->chunk_type = SCTP_STREAM_RESET;
3984         ch->chunk_flags = 0;
3985         ch->chunk_length = htons(chk->send_size);
3986         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
3987         offset += sizeof(struct sctp_chunkhdr);
3988         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
3989                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
3990                 if (ph == NULL) {
3991                         /* TSNH */
3992                         break;
3993                 }
3994                 param_len = ntohs(ph->param_length);
3995                 if ((param_len > remaining_length) ||
3996                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
3997                         /* bad parameter length */
3998                         break;
3999                 }
4000                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4001                     (uint8_t *)&cstore);
4002                 if (ph == NULL) {
4003                         /* TSNH */
4004                         break;
4005                 }
4006                 ptype = ntohs(ph->param_type);
4007                 num_param++;
4008                 if (param_len > sizeof(cstore)) {
4009                         trunc = 1;
4010                 } else {
4011                         trunc = 0;
4012                 }
4013                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4014                         /* hit the max of parameters already sorry.. */
4015                         break;
4016                 }
4017                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4018                         struct sctp_stream_reset_out_request *req_out;
4019
4020                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4021                                 break;
4022                         }
4023                         req_out = (struct sctp_stream_reset_out_request *)ph;
4024                         num_req++;
4025                         if (stcb->asoc.stream_reset_outstanding) {
4026                                 seq = ntohl(req_out->response_seq);
4027                                 if (seq == stcb->asoc.str_reset_seq_out) {
4028                                         /* implicit ack */
4029                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4030                                 }
4031                         }
4032                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4033                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4034                         struct sctp_stream_reset_add_strm *str_add;
4035
4036                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4037                                 break;
4038                         }
4039                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4040                         num_req++;
4041                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4042                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4043                         struct sctp_stream_reset_add_strm *str_add;
4044
4045                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4046                                 break;
4047                         }
4048                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4049                         num_req++;
4050                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4051                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4052                         struct sctp_stream_reset_in_request *req_in;
4053
4054                         num_req++;
4055                         req_in = (struct sctp_stream_reset_in_request *)ph;
4056                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4057                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4058                         struct sctp_stream_reset_tsn_request *req_tsn;
4059
4060                         num_req++;
4061                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4062                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4063                                 ret_code = 1;
4064                                 goto strres_nochunk;
4065                         }
4066                         /* no more */
4067                         break;
4068                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4069                         struct sctp_stream_reset_response *resp;
4070                         uint32_t result;
4071
4072                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4073                                 break;
4074                         }
4075                         resp = (struct sctp_stream_reset_response *)ph;
4076                         seq = ntohl(resp->response_seq);
4077                         result = ntohl(resp->result);
4078                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4079                                 ret_code = 1;
4080                                 goto strres_nochunk;
4081                         }
4082                 } else {
4083                         break;
4084                 }
4085                 offset += SCTP_SIZE32(param_len);
4086                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4087                         remaining_length -= SCTP_SIZE32(param_len);
4088                 } else {
4089                         remaining_length = 0;
4090                 }
4091         }
4092         if (num_req == 0) {
4093                 /* we have no response free the stuff */
4094                 goto strres_nochunk;
4095         }
4096         /* ok we have a chunk to link in */
4097         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4098             chk,
4099             sctp_next);
4100         stcb->asoc.ctrl_queue_cnt++;
4101         return (ret_code);
4102 }
4103
4104 /*
4105  * Handle a router or endpoints report of a packet loss, there are two ways
4106  * to handle this, either we get the whole packet and must disect it
4107  * ourselves (possibly with truncation and or corruption) or it is a summary
4108  * from a middle box that did the disectting for us.
4109  */
4110 static void
4111 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4112     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4113 {
4114         struct sctp_chunk_desc desc;
4115         struct sctp_chunkhdr *chk_hdr;
4116         struct sctp_data_chunk *data_chunk;
4117         struct sctp_idata_chunk *idata_chunk;
4118         uint32_t bottle_bw, on_queue;
4119         uint32_t offset, chk_len;
4120         uint16_t trunc_len;
4121         uint16_t pktdrp_len;
4122         uint8_t pktdrp_flags;
4123
4124         KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
4125             ("PKTDROP chunk too small"));
4126         pktdrp_flags = cp->ch.chunk_flags;
4127         pktdrp_len = ntohs(cp->ch.chunk_length);
4128         KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
4129         if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
4130                 trunc_len = ntohs(cp->trunc_len);
4131                 if (trunc_len <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
4132                         /* The peer plays games with us. */
4133                         return;
4134                 }
4135         } else {
4136                 trunc_len = 0;
4137         }
4138         limit -= sizeof(struct sctp_pktdrop_chunk);
4139         offset = 0;
4140         if (offset == limit) {
4141                 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4142                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4143                 }
4144         } else if (offset + sizeof(struct sctphdr) > limit) {
4145                 /* Only a partial SCTP common header. */
4146                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4147                 offset = limit;
4148         } else {
4149                 /* XXX: Check embedded SCTP common header. */
4150                 offset += sizeof(struct sctphdr);
4151         }
4152         /* Now parse through the chunks themselves. */
4153         while (offset < limit) {
4154                 if (offset + sizeof(struct sctp_chunkhdr) > limit) {
4155                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4156                         break;
4157                 }
4158                 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
4159                 desc.chunk_type = chk_hdr->chunk_type;
4160                 /* get amount we need to move */
4161                 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
4162                 if (chk_len < sizeof(struct sctp_chunkhdr)) {
4163                         /* Someone is lying... */
4164                         break;
4165                 }
4166                 if (desc.chunk_type == SCTP_DATA) {
4167                         if (stcb->asoc.idata_supported) {
4168                                 /* Some is playing games with us. */
4169                                 break;
4170                         }
4171                         if (chk_len <= sizeof(struct sctp_data_chunk)) {
4172                                 /* Some is playing games with us. */
4173                                 break;
4174                         }
4175                         if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4176                                 /*
4177                                  * Not enough data bytes available in the
4178                                  * chunk.
4179                                  */
4180                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4181                                 goto next_chunk;
4182                         }
4183                         if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4184                                 /* Not enough data in buffer. */
4185                                 break;
4186                         }
4187                         data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
4188                         memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4189                         desc.tsn_ifany = data_chunk->dp.tsn;
4190                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4191                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4192                         }
4193                 } else if (desc.chunk_type == SCTP_IDATA) {
4194                         if (!stcb->asoc.idata_supported) {
4195                                 /* Some is playing games with us. */
4196                                 break;
4197                         }
4198                         if (chk_len <= sizeof(struct sctp_idata_chunk)) {
4199                                 /* Some is playing games with us. */
4200                                 break;
4201                         }
4202                         if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4203                                 /*
4204                                  * Not enough data bytes available in the
4205                                  * chunk.
4206                                  */
4207                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4208                                 goto next_chunk;
4209                         }
4210                         if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4211                                 /* Not enough data in buffer. */
4212                                 break;
4213                         }
4214                         idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
4215                         memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4216                         desc.tsn_ifany = idata_chunk->dp.tsn;
4217                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4218                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4219                         }
4220                 } else {
4221                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4222                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4223                         }
4224                 }
4225                 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
4226                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4227                         break;
4228                 }
4229 next_chunk:
4230                 offset += SCTP_SIZE32(chk_len);
4231         }
4232         /* Now update any rwnd --- possibly */
4233         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4234                 /* From a peer, we get a rwnd report */
4235                 uint32_t a_rwnd;
4236
4237                 SCTP_STAT_INCR(sctps_pdrpfehos);
4238
4239                 bottle_bw = ntohl(cp->bottle_bw);
4240                 on_queue = ntohl(cp->current_onq);
4241                 if (bottle_bw && on_queue) {
4242                         /* a rwnd report is in here */
4243                         if (bottle_bw > on_queue)
4244                                 a_rwnd = bottle_bw - on_queue;
4245                         else
4246                                 a_rwnd = 0;
4247
4248                         if (a_rwnd == 0)
4249                                 stcb->asoc.peers_rwnd = 0;
4250                         else {
4251                                 if (a_rwnd > stcb->asoc.total_flight) {
4252                                         stcb->asoc.peers_rwnd =
4253                                             a_rwnd - stcb->asoc.total_flight;
4254                                 } else {
4255                                         stcb->asoc.peers_rwnd = 0;
4256                                 }
4257                                 if (stcb->asoc.peers_rwnd <
4258                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4259                                         /* SWS sender side engages */
4260                                         stcb->asoc.peers_rwnd = 0;
4261                                 }
4262                         }
4263                 }
4264         } else {
4265                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4266         }
4267
4268         /* now middle boxes in sat networks get a cwnd bump */
4269         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
4270             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4271             (stcb->asoc.sat_network)) {
4272                 /*
4273                  * This is debatable but for sat networks it makes sense
4274                  * Note if a T3 timer has went off, we will prohibit any
4275                  * changes to cwnd until we exit the t3 loss recovery.
4276                  */
4277                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4278                     net, cp, &bottle_bw, &on_queue);
4279         }
4280 }
4281
4282 /*
4283  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4284  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4285  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4286  * length of the complete packet outputs: - length: modified to remaining
4287  * length after control processing - netp: modified to new sctp_nets after
4288  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4289  * bad packet,...) otherwise return the tcb for this packet
4290  */
4291 #ifdef __GNUC__
4292 __attribute__((noinline))
4293 #endif
4294 static struct sctp_tcb *
4295 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4296     struct sockaddr *src, struct sockaddr *dst,
4297     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4298     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4299     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4300     uint32_t vrf_id, uint16_t port)
4301 {
4302         struct sctp_association *asoc;
4303         struct mbuf *op_err;
4304         char msg[SCTP_DIAG_INFO_LEN];
4305         uint32_t vtag_in;
4306         int num_chunks = 0;     /* number of control chunks processed */
4307         uint32_t chk_length, contiguous;
4308         int ret;
4309         int abort_no_unlock = 0;
4310         int ecne_seen = 0;
4311
4312         /*
4313          * How big should this be, and should it be alloc'd? Lets try the
4314          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4315          * until we get into jumbo grams and such..
4316          */
4317         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4318         int got_auth = 0;
4319         uint32_t auth_offset = 0, auth_len = 0;
4320         int auth_skipped = 0;
4321         int asconf_cnt = 0;
4322
4323         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4324             iphlen, *offset, length, (void *)stcb);
4325
4326         if (stcb) {
4327                 SCTP_TCB_LOCK_ASSERT(stcb);
4328         }
4329         /* validate chunk header length... */
4330         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4331                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4332                     ntohs(ch->chunk_length));
4333                 *offset = length;
4334                 return (stcb);
4335         }
4336         /*
4337          * validate the verification tag
4338          */
4339         vtag_in = ntohl(sh->v_tag);
4340
4341         if (ch->chunk_type == SCTP_INITIATION) {
4342                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4343                     ntohs(ch->chunk_length), vtag_in);
4344                 if (vtag_in != 0) {
4345                         /* protocol error- silently discard... */
4346                         SCTP_STAT_INCR(sctps_badvtag);
4347                         if (stcb != NULL) {
4348                                 SCTP_TCB_UNLOCK(stcb);
4349                         }
4350                         return (NULL);
4351                 }
4352         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4353                 /*
4354                  * If there is no stcb, skip the AUTH chunk and process
4355                  * later after a stcb is found (to validate the lookup was
4356                  * valid.
4357                  */
4358                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4359                     (stcb == NULL) &&
4360                     (inp->auth_supported == 1)) {
4361                         /* save this chunk for later processing */
4362                         auth_skipped = 1;
4363                         auth_offset = *offset;
4364                         auth_len = ntohs(ch->chunk_length);
4365
4366                         /* (temporarily) move past this chunk */
4367                         *offset += SCTP_SIZE32(auth_len);
4368                         if (*offset >= length) {
4369                                 /* no more data left in the mbuf chain */
4370                                 *offset = length;
4371                                 return (NULL);
4372                         }
4373                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4374                             sizeof(struct sctp_chunkhdr), chunk_buf);
4375                 }
4376                 if (ch == NULL) {
4377                         /* Help */
4378                         *offset = length;
4379                         return (stcb);
4380                 }
4381                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4382                         goto process_control_chunks;
4383                 }
4384                 /*
4385                  * first check if it's an ASCONF with an unknown src addr we
4386                  * need to look inside to find the association
4387                  */
4388                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4389                         struct sctp_chunkhdr *asconf_ch = ch;
4390                         uint32_t asconf_offset = 0, asconf_len = 0;
4391
4392                         /* inp's refcount may be reduced */
4393                         SCTP_INP_INCR_REF(inp);
4394
4395                         asconf_offset = *offset;
4396                         do {
4397                                 asconf_len = ntohs(asconf_ch->chunk_length);
4398                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4399                                         break;
4400                                 stcb = sctp_findassociation_ep_asconf(m,
4401                                     *offset,
4402                                     dst,
4403                                     sh, &inp, netp, vrf_id);
4404                                 if (stcb != NULL)
4405                                         break;
4406                                 asconf_offset += SCTP_SIZE32(asconf_len);
4407                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4408                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4409                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4410                         if (stcb == NULL) {
4411                                 /*
4412                                  * reduce inp's refcount if not reduced in
4413                                  * sctp_findassociation_ep_asconf().
4414                                  */
4415                                 SCTP_INP_DECR_REF(inp);
4416                         }
4417
4418                         /* now go back and verify any auth chunk to be sure */
4419                         if (auth_skipped && (stcb != NULL)) {
4420                                 struct sctp_auth_chunk *auth;
4421
4422                                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
4423                                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
4424                                         got_auth = 1;
4425                                         auth_skipped = 0;
4426                                 } else {
4427                                         auth = NULL;
4428                                 }
4429                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4430                                     auth_offset)) {
4431                                         /* auth HMAC failed so dump it */
4432                                         *offset = length;
4433                                         return (stcb);
4434                                 } else {
4435                                         /* remaining chunks are HMAC checked */
4436                                         stcb->asoc.authenticated = 1;
4437                                 }
4438                         }
4439                 }
4440                 if (stcb == NULL) {
4441                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4442                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4443                             msg);
4444                         /* no association, so it's out of the blue... */
4445                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4446                             mflowtype, mflowid, inp->fibnum,
4447                             vrf_id, port);
4448                         *offset = length;
4449                         return (NULL);
4450                 }
4451                 asoc = &stcb->asoc;
4452                 /* ABORT and SHUTDOWN can use either v_tag... */
4453                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4454                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4455                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4456                         /* Take the T-bit always into account. */
4457                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4458                             (vtag_in == asoc->my_vtag)) ||
4459                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4460                             (asoc->peer_vtag != htonl(0)) &&
4461                             (vtag_in == asoc->peer_vtag))) {
4462                                 /* this is valid */
4463                         } else {
4464                                 /* drop this packet... */
4465                                 SCTP_STAT_INCR(sctps_badvtag);
4466                                 if (stcb != NULL) {
4467                                         SCTP_TCB_UNLOCK(stcb);
4468                                 }
4469                                 return (NULL);
4470                         }
4471                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4472                         if (vtag_in != asoc->my_vtag) {
4473                                 /*
4474                                  * this could be a stale SHUTDOWN-ACK or the
4475                                  * peer never got the SHUTDOWN-COMPLETE and
4476                                  * is still hung; we have started a new asoc
4477                                  * but it won't complete until the shutdown
4478                                  * is completed
4479                                  */
4480                                 if (stcb != NULL) {
4481                                         SCTP_TCB_UNLOCK(stcb);
4482                                 }
4483                                 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4484                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4485                                     msg);
4486                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4487                                     sh, inp, op_err,
4488                                     mflowtype, mflowid, fibnum,
4489                                     vrf_id, port);
4490                                 return (NULL);
4491                         }
4492                 } else {
4493                         /* for all other chunks, vtag must match */
4494                         if (vtag_in != asoc->my_vtag) {
4495                                 /* invalid vtag... */
4496                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4497                                     "invalid vtag: %xh, expect %xh\n",
4498                                     vtag_in, asoc->my_vtag);
4499                                 SCTP_STAT_INCR(sctps_badvtag);
4500                                 if (stcb != NULL) {
4501                                         SCTP_TCB_UNLOCK(stcb);
4502                                 }
4503                                 *offset = length;
4504                                 return (NULL);
4505                         }
4506                 }
4507         }                       /* end if !SCTP_COOKIE_ECHO */
4508         /*
4509          * process all control chunks...
4510          */
4511         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4512             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4513             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4514             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4515                 /* implied cookie-ack.. we must have lost the ack */
4516                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4517                     *netp);
4518         }
4519
4520 process_control_chunks:
4521         while (IS_SCTP_CONTROL(ch)) {
4522                 /* validate chunk length */
4523                 chk_length = ntohs(ch->chunk_length);
4524                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4525                     ch->chunk_type, chk_length);
4526                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4527                 if (chk_length < sizeof(*ch) ||
4528                     (*offset + (int)chk_length) > length) {
4529                         *offset = length;
4530                         return (stcb);
4531                 }
4532                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4533                 /*
4534                  * INIT and INIT-ACK only gets the init ack "header" portion
4535                  * only because we don't have to process the peer's COOKIE.
4536                  * All others get a complete chunk.
4537                  */
4538                 switch (ch->chunk_type) {
4539                 case SCTP_INITIATION:
4540                         contiguous = sizeof(struct sctp_init_chunk);
4541                         break;
4542                 case SCTP_INITIATION_ACK:
4543                         contiguous = sizeof(struct sctp_init_ack_chunk);
4544                         break;
4545                 default:
4546                         contiguous = min(chk_length, sizeof(chunk_buf));
4547                         break;
4548                 }
4549                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4550                     contiguous,
4551                     chunk_buf);
4552                 if (ch == NULL) {
4553                         *offset = length;
4554                         if (stcb != NULL) {
4555                                 SCTP_TCB_UNLOCK(stcb);
4556                         }
4557                         return (NULL);
4558                 }
4559
4560                 num_chunks++;
4561                 /* Save off the last place we got a control from */
4562                 if (stcb != NULL) {
4563                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4564                                 /*
4565                                  * allow last_control to be NULL if
4566                                  * ASCONF... ASCONF processing will find the
4567                                  * right net later
4568                                  */
4569                                 if ((netp != NULL) && (*netp != NULL))
4570                                         stcb->asoc.last_control_chunk_from = *netp;
4571                         }
4572                 }
4573 #ifdef SCTP_AUDITING_ENABLED
4574                 sctp_audit_log(0xB0, ch->chunk_type);
4575 #endif
4576
4577                 /* check to see if this chunk required auth, but isn't */
4578                 if ((stcb != NULL) &&
4579                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4580                     !stcb->asoc.authenticated) {
4581                         /* "silently" ignore */
4582                         SCTP_STAT_INCR(sctps_recvauthmissing);
4583                         goto next_chunk;
4584                 }
4585                 switch (ch->chunk_type) {
4586                 case SCTP_INITIATION:
4587                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4588                         /* The INIT chunk must be the only chunk. */
4589                         if ((num_chunks > 1) ||
4590                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4591                                 /* RFC 4960 requires that no ABORT is sent */
4592                                 *offset = length;
4593                                 if (stcb != NULL) {
4594                                         SCTP_TCB_UNLOCK(stcb);
4595                                 }
4596                                 return (NULL);
4597                         }
4598                         /* Honor our resource limit. */
4599                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4600                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4601                                 sctp_abort_association(inp, stcb, m, iphlen,
4602                                     src, dst, sh, op_err,
4603                                     mflowtype, mflowid,
4604                                     vrf_id, port);
4605                                 *offset = length;
4606                                 return (NULL);
4607                         }
4608                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4609                             (struct sctp_init_chunk *)ch, inp,
4610                             stcb, *netp, &abort_no_unlock,
4611                             mflowtype, mflowid,
4612                             vrf_id, port);
4613                         *offset = length;
4614                         if ((!abort_no_unlock) && (stcb != NULL)) {
4615                                 SCTP_TCB_UNLOCK(stcb);
4616                         }
4617                         return (NULL);
4618                         break;
4619                 case SCTP_PAD_CHUNK:
4620                         break;
4621                 case SCTP_INITIATION_ACK:
4622                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4623                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4624                                 /* We are not interested anymore */
4625                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4626                                         ;
4627                                 } else {
4628                                         *offset = length;
4629                                         if (stcb != NULL) {
4630                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4631                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4632                                         }
4633                                         return (NULL);
4634                                 }
4635                         }
4636                         /* The INIT-ACK chunk must be the only chunk. */
4637                         if ((num_chunks > 1) ||
4638                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4639                                 *offset = length;
4640                                 return (stcb);
4641                         }
4642                         if ((netp != NULL) && (*netp != NULL)) {
4643                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4644                                     src, dst, sh,
4645                                     (struct sctp_init_ack_chunk *)ch,
4646                                     stcb, *netp,
4647                                     &abort_no_unlock,
4648                                     mflowtype, mflowid,
4649                                     vrf_id);
4650                         } else {
4651                                 ret = -1;
4652                         }
4653                         *offset = length;
4654                         if (abort_no_unlock) {
4655                                 return (NULL);
4656                         }
4657                         /*
4658                          * Special case, I must call the output routine to
4659                          * get the cookie echoed
4660                          */
4661                         if ((stcb != NULL) && (ret == 0)) {
4662                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4663                         }
4664                         return (stcb);
4665                         break;
4666                 case SCTP_SELECTIVE_ACK:
4667                 case SCTP_NR_SELECTIVE_ACK:
4668                         {
4669                                 int abort_now = 0;
4670                                 uint32_t a_rwnd, cum_ack;
4671                                 uint16_t num_seg, num_nr_seg, num_dup;
4672                                 uint8_t flags;
4673                                 int offset_seg, offset_dup;
4674
4675                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4676                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4677                                 SCTP_STAT_INCR(sctps_recvsacks);
4678                                 if (stcb == NULL) {
4679                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4680                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4681                                         break;
4682                                 }
4683                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4684                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4685                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4686                                                 break;
4687                                         }
4688                                 } else {
4689                                         if (stcb->asoc.nrsack_supported == 0) {
4690                                                 goto unknown_chunk;
4691                                         }
4692                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4693                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4694                                                 break;
4695                                         }
4696                                 }
4697                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4698                                         /*-
4699                                          * If we have sent a shutdown-ack, we will pay no
4700                                          * attention to a sack sent in to us since
4701                                          * we don't care anymore.
4702                                          */
4703                                         break;
4704                                 }
4705                                 flags = ch->chunk_flags;
4706                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4707                                         struct sctp_sack_chunk *sack;
4708
4709                                         sack = (struct sctp_sack_chunk *)ch;
4710                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4711                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4712                                         num_nr_seg = 0;
4713                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4714                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4715                                         if (sizeof(struct sctp_sack_chunk) +
4716                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4717                                             num_dup * sizeof(uint32_t) != chk_length) {
4718                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4719                                                 break;
4720                                         }
4721                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4722                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4723                                 } else {
4724                                         struct sctp_nr_sack_chunk *nr_sack;
4725
4726                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4727                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4728                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4729                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4730                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4731                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4732                                         if (sizeof(struct sctp_nr_sack_chunk) +
4733                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4734                                             num_dup * sizeof(uint32_t) != chk_length) {
4735                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4736                                                 break;
4737                                         }
4738                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4739                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4740                                 }
4741                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4742                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4743                                     cum_ack, num_seg, a_rwnd);
4744                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4745                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4746                                     (num_seg == 0) && (num_nr_seg == 0) &&
4747                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4748                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4749                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4750                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4751                                         /*
4752                                          * We have a SIMPLE sack having no
4753                                          * prior segments and data on sent
4754                                          * queue to be acked. Use the faster
4755                                          * path sack processing. We also
4756                                          * allow window update sacks with no
4757                                          * missing segments to go this way
4758                                          * too.
4759                                          */
4760                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4761                                             &abort_now, ecne_seen);
4762                                 } else {
4763                                         if ((netp != NULL) && (*netp != NULL)) {
4764                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4765                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4766                                                     cum_ack, a_rwnd, ecne_seen);
4767                                         }
4768                                 }
4769                                 if (abort_now) {
4770                                         /* ABORT signal from sack processing */
4771                                         *offset = length;
4772                                         return (NULL);
4773                                 }
4774                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4775                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4776                                     (stcb->asoc.stream_queue_cnt == 0)) {
4777                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4778                                 }
4779                                 break;
4780                         }
4781                 case SCTP_HEARTBEAT_REQUEST:
4782                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4783                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4784                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4785                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4786                                     chk_length, *netp);
4787                         }
4788                         break;
4789                 case SCTP_HEARTBEAT_ACK:
4790                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
4791                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4792                                 /* Its not ours */
4793                                 *offset = length;
4794                                 return (stcb);
4795                         }
4796                         SCTP_STAT_INCR(sctps_recvheartbeatack);
4797                         if ((netp != NULL) && (*netp != NULL)) {
4798                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4799                                     stcb, *netp);
4800                         }
4801                         break;
4802                 case SCTP_ABORT_ASSOCIATION:
4803                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4804                             (void *)stcb);
4805                         *offset = length;
4806                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4807                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
4808                                         return (NULL);
4809                                 } else {
4810                                         return (stcb);
4811                                 }
4812                         } else {
4813                                 return (NULL);
4814                         }
4815                         break;
4816                 case SCTP_SHUTDOWN:
4817                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4818                             (void *)stcb);
4819                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4820                                 *offset = length;
4821                                 return (stcb);
4822                         }
4823                         if ((netp != NULL) && (*netp != NULL)) {
4824                                 int abort_flag = 0;
4825
4826                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4827                                     stcb, *netp, &abort_flag);
4828                                 if (abort_flag) {
4829                                         *offset = length;
4830                                         return (NULL);
4831                                 }
4832                         }
4833                         break;
4834                 case SCTP_SHUTDOWN_ACK:
4835                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
4836                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4837                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4838                         }
4839                         *offset = length;
4840                         return (NULL);
4841                         break;
4842                 case SCTP_OPERATION_ERROR:
4843                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
4844                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
4845                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
4846                                 *offset = length;
4847                                 return (NULL);
4848                         }
4849                         break;
4850                 case SCTP_COOKIE_ECHO:
4851                         SCTPDBG(SCTP_DEBUG_INPUT3,
4852                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
4853                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
4854                                 ;
4855                         } else {
4856                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4857                                         /* We are not interested anymore */
4858                         abend:
4859                                         if (stcb != NULL) {
4860                                                 SCTP_TCB_UNLOCK(stcb);
4861                                         }
4862                                         *offset = length;
4863                                         return (NULL);
4864                                 }
4865                         }
4866                         /*-
4867                          * First are we accepting? We do this again here
4868                          * since it is possible that a previous endpoint WAS
4869                          * listening responded to a INIT-ACK and then
4870                          * closed. We opened and bound.. and are now no
4871                          * longer listening.
4872                          *
4873                          * XXXGL: notes on checking listen queue length.
4874                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
4875                          *    SOLISTENING(), because a listening "UDP type"
4876                          *    socket isn't listening in terms of the socket
4877                          *    layer.  It is a normal data flow socket, that
4878                          *    can fork off new connections.  Thus, we should
4879                          *    look into sol_qlen only in case we are !UDP.
4880                          * 2) Checking sol_qlen in general requires locking
4881                          *    the socket, and this code lacks that.
4882                          */
4883                         if ((stcb == NULL) &&
4884                             (!SCTP_IS_LISTENING(inp) ||
4885                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
4886                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
4887                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4888                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4889                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4890                                         sctp_abort_association(inp, stcb, m, iphlen,
4891                                             src, dst, sh, op_err,
4892                                             mflowtype, mflowid,
4893                                             vrf_id, port);
4894                                 }
4895                                 *offset = length;
4896                                 return (NULL);
4897                         } else {
4898                                 struct mbuf *ret_buf;
4899                                 struct sctp_inpcb *linp;
4900                                 struct sctp_tmit_chunk *chk;
4901
4902                                 if (stcb) {
4903                                         linp = NULL;
4904                                 } else {
4905                                         linp = inp;
4906                                 }
4907
4908                                 if (linp != NULL) {
4909                                         SCTP_ASOC_CREATE_LOCK(linp);
4910                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
4911                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4912                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
4913                                                 goto abend;
4914                                         }
4915                                 }
4916
4917                                 if (netp != NULL) {
4918                                         struct sctp_tcb *locked_stcb;
4919
4920                                         locked_stcb = stcb;
4921                                         ret_buf =
4922                                             sctp_handle_cookie_echo(m, iphlen,
4923                                             *offset,
4924                                             src, dst,
4925                                             sh,
4926                                             (struct sctp_cookie_echo_chunk *)ch,
4927                                             &inp, &stcb, netp,
4928                                             auth_skipped,
4929                                             auth_offset,
4930                                             auth_len,
4931                                             &locked_stcb,
4932                                             mflowtype,
4933                                             mflowid,
4934                                             vrf_id,
4935                                             port);
4936                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
4937                                                 SCTP_TCB_UNLOCK(locked_stcb);
4938                                         }
4939                                         if (stcb != NULL) {
4940                                                 SCTP_TCB_LOCK_ASSERT(stcb);
4941                                         }
4942                                 } else {
4943                                         ret_buf = NULL;
4944                                 }
4945                                 if (linp != NULL) {
4946                                         SCTP_ASOC_CREATE_UNLOCK(linp);
4947                                 }
4948                                 if (ret_buf == NULL) {
4949                                         if (stcb != NULL) {
4950                                                 SCTP_TCB_UNLOCK(stcb);
4951                                         }
4952                                         SCTPDBG(SCTP_DEBUG_INPUT3,
4953                                             "GAK, null buffer\n");
4954                                         *offset = length;
4955                                         return (NULL);
4956                                 }
4957                                 /* if AUTH skipped, see if it verified... */
4958                                 if (auth_skipped) {
4959                                         got_auth = 1;
4960                                         auth_skipped = 0;
4961                                 }
4962                                 /* Restart the timer if we have pending data */
4963                                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
4964                                         if (chk->whoTo != NULL) {
4965                                                 break;
4966                                         }
4967                                 }
4968                                 if (chk != NULL) {
4969                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
4970                                 }
4971                         }
4972                         break;
4973                 case SCTP_COOKIE_ACK:
4974                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
4975                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
4976                                 return (stcb);
4977                         }
4978                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4979                                 /* We are not interested anymore */
4980                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4981                                         ;
4982                                 } else if (stcb) {
4983                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4984                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
4985                                         *offset = length;
4986                                         return (NULL);
4987                                 }
4988                         }
4989                         if ((netp != NULL) && (*netp != NULL)) {
4990                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
4991                         }
4992                         break;
4993                 case SCTP_ECN_ECHO:
4994                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
4995                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
4996                                 /* Its not ours */
4997                                 *offset = length;
4998                                 return (stcb);
4999                         }
5000                         if (stcb->asoc.ecn_supported == 0) {
5001                                 goto unknown_chunk;
5002                         }
5003                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5004                         ecne_seen = 1;
5005                         break;
5006                 case SCTP_ECN_CWR:
5007                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5008                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5009                                 *offset = length;
5010                                 return (stcb);
5011                         }
5012                         if (stcb->asoc.ecn_supported == 0) {
5013                                 goto unknown_chunk;
5014                         }
5015                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5016                         break;
5017                 case SCTP_SHUTDOWN_COMPLETE:
5018                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5019                         /* must be first and only chunk */
5020                         if ((num_chunks > 1) ||
5021                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5022                                 *offset = length;
5023                                 return (stcb);
5024                         }
5025                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5026                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5027                                     stcb, *netp);
5028                         }
5029                         *offset = length;
5030                         return (NULL);
5031                         break;
5032                 case SCTP_ASCONF:
5033                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5034                         if (stcb != NULL) {
5035                                 if (stcb->asoc.asconf_supported == 0) {
5036                                         goto unknown_chunk;
5037                                 }
5038                                 sctp_handle_asconf(m, *offset, src,
5039                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5040                                 asconf_cnt++;
5041                         }
5042                         break;
5043                 case SCTP_ASCONF_ACK:
5044                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5045                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5046                                 /* Its not ours */
5047                                 *offset = length;
5048                                 return (stcb);
5049                         }
5050                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5051                                 if (stcb->asoc.asconf_supported == 0) {
5052                                         goto unknown_chunk;
5053                                 }
5054                                 /* He's alive so give him credit */
5055                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5056                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5057                                             stcb->asoc.overall_error_count,
5058                                             0,
5059                                             SCTP_FROM_SCTP_INPUT,
5060                                             __LINE__);
5061                                 }
5062                                 stcb->asoc.overall_error_count = 0;
5063                                 sctp_handle_asconf_ack(m, *offset,
5064                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5065                                 if (abort_no_unlock)
5066                                         return (NULL);
5067                         }
5068                         break;
5069                 case SCTP_FORWARD_CUM_TSN:
5070                 case SCTP_IFORWARD_CUM_TSN:
5071                         SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5072                             ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
5073                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5074                                 /* Its not ours */
5075                                 *offset = length;
5076                                 return (stcb);
5077                         }
5078
5079                         if (stcb != NULL) {
5080                                 int abort_flag = 0;
5081
5082                                 if (stcb->asoc.prsctp_supported == 0) {
5083                                         goto unknown_chunk;
5084                                 }
5085                                 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
5086                                     ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
5087                                         if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
5088                                                 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
5089                                         } else {
5090                                                 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
5091                                         }
5092                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5093                                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
5094                                         *offset = length;
5095                                         return (NULL);
5096                                 }
5097                                 *fwd_tsn_seen = 1;
5098                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5099                                         /* We are not interested anymore */
5100                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5101                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5102                                         *offset = length;
5103                                         return (NULL);
5104                                 }
5105                                 /*
5106                                  * For sending a SACK this looks like DATA
5107                                  * chunks.
5108                                  */
5109                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5110                                 sctp_handle_forward_tsn(stcb,
5111                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5112                                 if (abort_flag) {
5113                                         *offset = length;
5114                                         return (NULL);
5115                                 }
5116                         }
5117                         break;
5118                 case SCTP_STREAM_RESET:
5119                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5120                         if ((stcb == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req))) {
5121                                 /* Its not ours */
5122                                 *offset = length;
5123                                 return (stcb);
5124                         }
5125                         if (stcb->asoc.reconfig_supported == 0) {
5126                                 goto unknown_chunk;
5127                         }
5128                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5129                                 /* stop processing */
5130                                 *offset = length;
5131                                 return (NULL);
5132                         }
5133                         break;
5134                 case SCTP_PACKET_DROPPED:
5135                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5136                         /* re-get it all please */
5137                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5138                                 /* Its not ours */
5139                                 *offset = length;
5140                                 return (stcb);
5141                         }
5142
5143                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5144                                 if (stcb->asoc.pktdrop_supported == 0) {
5145                                         goto unknown_chunk;
5146                                 }
5147                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5148                                     stcb, *netp,
5149                                     min(chk_length, contiguous));
5150                         }
5151                         break;
5152                 case SCTP_AUTHENTICATION:
5153                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5154                         if (stcb == NULL) {
5155                                 /* save the first AUTH for later processing */
5156                                 if (auth_skipped == 0) {
5157                                         auth_offset = *offset;
5158                                         auth_len = chk_length;
5159                                         auth_skipped = 1;
5160                                 }
5161                                 /* skip this chunk (temporarily) */
5162                                 goto next_chunk;
5163                         }
5164                         if (stcb->asoc.auth_supported == 0) {
5165                                 goto unknown_chunk;
5166                         }
5167                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5168                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5169                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5170                                 /* Its not ours */
5171                                 *offset = length;
5172                                 return (stcb);
5173                         }
5174                         if (got_auth == 1) {
5175                                 /* skip this chunk... it's already auth'd */
5176                                 goto next_chunk;
5177                         }
5178                         got_auth = 1;
5179                         if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
5180                                 /* auth HMAC failed so dump the packet */
5181                                 *offset = length;
5182                                 return (stcb);
5183                         } else {
5184                                 /* remaining chunks are HMAC checked */
5185                                 stcb->asoc.authenticated = 1;
5186                         }
5187                         break;
5188
5189                 default:
5190         unknown_chunk:
5191                         /* it's an unknown chunk! */
5192                         if ((ch->chunk_type & 0x40) &&
5193                             (stcb != NULL) &&
5194                             (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
5195                             (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
5196                             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5197                                 struct sctp_gen_error_cause *cause;
5198                                 int len;
5199
5200                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5201                                     0, M_NOWAIT, 1, MT_DATA);
5202                                 if (op_err != NULL) {
5203                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5204                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5205                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5206                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5207                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5208                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5209                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5210 #ifdef SCTP_MBUF_LOGGING
5211                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5212                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5213                                                 }
5214 #endif
5215                                                 sctp_queue_op_err(stcb, op_err);
5216                                         } else {
5217                                                 sctp_m_freem(op_err);
5218                                         }
5219                                 }
5220                         }
5221                         if ((ch->chunk_type & 0x80) == 0) {
5222                                 /* discard this packet */
5223                                 *offset = length;
5224                                 return (stcb);
5225                         }       /* else skip this bad chunk and continue... */
5226                         break;
5227                 }               /* switch (ch->chunk_type) */
5228
5229 next_chunk:
5230                 /* get the next chunk */
5231                 *offset += SCTP_SIZE32(chk_length);
5232                 if (*offset >= length) {
5233                         /* no more data left in the mbuf chain */
5234                         break;
5235                 }
5236                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5237                     sizeof(struct sctp_chunkhdr), chunk_buf);
5238                 if (ch == NULL) {
5239                         *offset = length;
5240                         return (stcb);
5241                 }
5242         }                       /* while */
5243
5244         if ((asconf_cnt > 0) && (stcb != NULL)) {
5245                 sctp_send_asconf_ack(stcb);
5246         }
5247         return (stcb);
5248 }
5249
5250 /*
5251  * common input chunk processing (v4 and v6)
5252  */
5253 void
5254 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5255     struct sockaddr *src, struct sockaddr *dst,
5256     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5257     uint8_t compute_crc,
5258     uint8_t ecn_bits,
5259     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5260     uint32_t vrf_id, uint16_t port)
5261 {
5262         uint32_t high_tsn;
5263         int fwd_tsn_seen = 0, data_processed = 0;
5264         struct mbuf *m = *mm, *op_err;
5265         char msg[SCTP_DIAG_INFO_LEN];
5266         int un_sent;
5267         int cnt_ctrl_ready = 0;
5268         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5269         struct sctp_tcb *stcb = NULL;
5270         struct sctp_nets *net = NULL;
5271
5272         SCTP_STAT_INCR(sctps_recvdatagrams);
5273 #ifdef SCTP_AUDITING_ENABLED
5274         sctp_audit_log(0xE0, 1);
5275         sctp_auditing(0, inp, stcb, net);
5276 #endif
5277         if (compute_crc != 0) {
5278                 uint32_t check, calc_check;
5279
5280                 check = sh->checksum;
5281                 sh->checksum = 0;
5282                 calc_check = sctp_calculate_cksum(m, iphlen);
5283                 sh->checksum = check;
5284                 if (calc_check != check) {
5285                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5286                             calc_check, check, (void *)m, length, iphlen);
5287                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5288                             sh, ch, &inp, &net, vrf_id);
5289 #if defined(INET) || defined(INET6)
5290                         if ((ch->chunk_type != SCTP_INITIATION) &&
5291                             (net != NULL) && (net->port != port)) {
5292                                 if (net->port == 0) {
5293                                         /* UDP encapsulation turned on. */
5294                                         net->mtu -= sizeof(struct udphdr);
5295                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5296                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5297                                         }
5298                                 } else if (port == 0) {
5299                                         /* UDP encapsulation turned off. */
5300                                         net->mtu += sizeof(struct udphdr);
5301                                         /* XXX Update smallest_mtu */
5302                                 }
5303                                 net->port = port;
5304                         }
5305 #endif
5306                         if (net != NULL) {
5307                                 net->flowtype = mflowtype;
5308                                 net->flowid = mflowid;
5309                         }
5310                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5311                         if ((inp != NULL) && (stcb != NULL)) {
5312                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5313                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5314                         } else if ((inp != NULL) && (stcb == NULL)) {
5315                                 inp_decr = inp;
5316                         }
5317                         SCTP_STAT_INCR(sctps_badsum);
5318                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5319                         goto out;
5320                 }
5321         }
5322         /* Destination port of 0 is illegal, based on RFC4960. */
5323         if (sh->dest_port == 0) {
5324                 SCTP_STAT_INCR(sctps_hdrops);
5325                 goto out;
5326         }
5327         stcb = sctp_findassociation_addr(m, offset, src, dst,
5328             sh, ch, &inp, &net, vrf_id);
5329 #if defined(INET) || defined(INET6)
5330         if ((ch->chunk_type != SCTP_INITIATION) &&
5331             (net != NULL) && (net->port != port)) {
5332                 if (net->port == 0) {
5333                         /* UDP encapsulation turned on. */
5334                         net->mtu -= sizeof(struct udphdr);
5335                         if (stcb->asoc.smallest_mtu > net->mtu) {
5336                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5337                         }
5338                 } else if (port == 0) {
5339                         /* UDP encapsulation turned off. */
5340                         net->mtu += sizeof(struct udphdr);
5341                         /* XXX Update smallest_mtu */
5342                 }
5343                 net->port = port;
5344         }
5345 #endif
5346         if (net != NULL) {
5347                 net->flowtype = mflowtype;
5348                 net->flowid = mflowid;
5349         }
5350         if (inp == NULL) {
5351                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5352                 SCTP_STAT_INCR(sctps_noport);
5353                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5354                         goto out;
5355                 }
5356                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5357                         sctp_send_shutdown_complete2(src, dst, sh,
5358                             mflowtype, mflowid, fibnum,
5359                             vrf_id, port);
5360                         goto out;
5361                 }
5362                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5363                         goto out;
5364                 }
5365                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5366                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5367                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5368                             (ch->chunk_type != SCTP_INIT))) {
5369                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5370                                     "Out of the blue");
5371                                 sctp_send_abort(m, iphlen, src, dst,
5372                                     sh, 0, op_err,
5373                                     mflowtype, mflowid, fibnum,
5374                                     vrf_id, port);
5375                         }
5376                 }
5377                 goto out;
5378         } else if (stcb == NULL) {
5379                 inp_decr = inp;
5380         }
5381         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5382             (void *)m, iphlen, offset, length, (void *)stcb);
5383         if (stcb) {
5384                 /* always clear this before beginning a packet */
5385                 stcb->asoc.authenticated = 0;
5386                 stcb->asoc.seen_a_sack_this_pkt = 0;
5387                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5388                     (void *)stcb, stcb->asoc.state);
5389
5390                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5391                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5392                         /*-
5393                          * If we hit here, we had a ref count
5394                          * up when the assoc was aborted and the
5395                          * timer is clearing out the assoc, we should
5396                          * NOT respond to any packet.. its OOTB.
5397                          */
5398                         SCTP_TCB_UNLOCK(stcb);
5399                         stcb = NULL;
5400                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5401                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5402                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5403                             msg);
5404                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5405                             mflowtype, mflowid, inp->fibnum,
5406                             vrf_id, port);
5407                         goto out;
5408                 }
5409         }
5410         if (IS_SCTP_CONTROL(ch)) {
5411                 /* process the control portion of the SCTP packet */
5412                 /* sa_ignore NO_NULL_CHK */
5413                 stcb = sctp_process_control(m, iphlen, &offset, length,
5414                     src, dst, sh, ch,
5415                     inp, stcb, &net, &fwd_tsn_seen,
5416                     mflowtype, mflowid, fibnum,
5417                     vrf_id, port);
5418                 if (stcb) {
5419                         /*
5420                          * This covers us if the cookie-echo was there and
5421                          * it changes our INP.
5422                          */
5423                         inp = stcb->sctp_ep;
5424 #if defined(INET) || defined(INET6)
5425                         if ((ch->chunk_type != SCTP_INITIATION) &&
5426                             (net != NULL) && (net->port != port)) {
5427                                 if (net->port == 0) {
5428                                         /* UDP encapsulation turned on. */
5429                                         net->mtu -= sizeof(struct udphdr);
5430                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5431                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5432                                         }
5433                                 } else if (port == 0) {
5434                                         /* UDP encapsulation turned off. */
5435                                         net->mtu += sizeof(struct udphdr);
5436                                         /* XXX Update smallest_mtu */
5437                                 }
5438                                 net->port = port;
5439                         }
5440 #endif
5441                 }
5442         } else {
5443                 /*
5444                  * no control chunks, so pre-process DATA chunks (these
5445                  * checks are taken care of by control processing)
5446                  */
5447
5448                 /*
5449                  * if DATA only packet, and auth is required, then punt...
5450                  * can't have authenticated without any AUTH (control)
5451                  * chunks
5452                  */
5453                 if ((stcb != NULL) &&
5454                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5455                         /* "silently" ignore */
5456                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5457                         SCTP_STAT_INCR(sctps_recvauthmissing);
5458                         goto out;
5459                 }
5460                 if (stcb == NULL) {
5461                         /* out of the blue DATA chunk */
5462                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5463                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5464                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5465                             msg);
5466                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5467                             mflowtype, mflowid, fibnum,
5468                             vrf_id, port);
5469                         goto out;
5470                 }
5471                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5472                         /* v_tag mismatch! */
5473                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5474                         SCTP_STAT_INCR(sctps_badvtag);
5475                         goto out;
5476                 }
5477         }
5478
5479         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5480         if (stcb == NULL) {
5481                 /*
5482                  * no valid TCB for this packet, or we found it's a bad
5483                  * packet while processing control, or we're done with this
5484                  * packet (done or skip rest of data), so we drop it...
5485                  */
5486                 goto out;
5487         }
5488
5489         /*
5490          * DATA chunk processing
5491          */
5492         /* plow through the data chunks while length > offset */
5493
5494         /*
5495          * Rest should be DATA only.  Check authentication state if AUTH for
5496          * DATA is required.
5497          */
5498         if ((length > offset) &&
5499             (stcb != NULL) &&
5500             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5501             !stcb->asoc.authenticated) {
5502                 /* "silently" ignore */
5503                 SCTP_STAT_INCR(sctps_recvauthmissing);
5504                 SCTPDBG(SCTP_DEBUG_AUTH1,
5505                     "Data chunk requires AUTH, skipped\n");
5506                 goto trigger_send;
5507         }
5508         if (length > offset) {
5509                 int retval;
5510
5511                 /*
5512                  * First check to make sure our state is correct. We would
5513                  * not get here unless we really did have a tag, so we don't
5514                  * abort if this happens, just dump the chunk silently.
5515                  */
5516                 switch (SCTP_GET_STATE(stcb)) {
5517                 case SCTP_STATE_COOKIE_ECHOED:
5518                         /*
5519                          * we consider data with valid tags in this state
5520                          * shows us the cookie-ack was lost. Imply it was
5521                          * there.
5522                          */
5523                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5524                         break;
5525                 case SCTP_STATE_COOKIE_WAIT:
5526                         /*
5527                          * We consider OOTB any data sent during asoc setup.
5528                          */
5529                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5530                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5531                             msg);
5532                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5533                             mflowtype, mflowid, inp->fibnum,
5534                             vrf_id, port);
5535                         goto out;
5536                         /* sa_ignore NOTREACHED */
5537                         break;
5538                 case SCTP_STATE_EMPTY:  /* should not happen */
5539                 case SCTP_STATE_INUSE:  /* should not happen */
5540                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5541                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5542                 default:
5543                         goto out;
5544                         /* sa_ignore NOTREACHED */
5545                         break;
5546                 case SCTP_STATE_OPEN:
5547                 case SCTP_STATE_SHUTDOWN_SENT:
5548                         break;
5549                 }
5550                 /* plow through the data chunks while length > offset */
5551                 retval = sctp_process_data(mm, iphlen, &offset, length,
5552                     inp, stcb, net, &high_tsn);
5553                 if (retval == 2) {
5554                         /*
5555                          * The association aborted, NO UNLOCK needed since
5556                          * the association is destroyed.
5557                          */
5558                         stcb = NULL;
5559                         goto out;
5560                 }
5561                 data_processed = 1;
5562                 /*
5563                  * Anything important needs to have been m_copy'ed in
5564                  * process_data
5565                  */
5566         }
5567
5568         /* take care of ecn */
5569         if ((data_processed == 1) &&
5570             (stcb->asoc.ecn_supported == 1) &&
5571             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5572                 /* Yep, we need to add a ECNE */
5573                 sctp_send_ecn_echo(stcb, net, high_tsn);
5574         }
5575
5576         if ((data_processed == 0) && (fwd_tsn_seen)) {
5577                 int was_a_gap;
5578                 uint32_t highest_tsn;
5579
5580                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5581                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5582                 } else {
5583                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5584                 }
5585                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5586                 stcb->asoc.send_sack = 1;
5587                 sctp_sack_check(stcb, was_a_gap);
5588         } else if (fwd_tsn_seen) {
5589                 stcb->asoc.send_sack = 1;
5590         }
5591         /* trigger send of any chunks in queue... */
5592 trigger_send:
5593 #ifdef SCTP_AUDITING_ENABLED
5594         sctp_audit_log(0xE0, 2);
5595         sctp_auditing(1, inp, stcb, net);
5596 #endif
5597         SCTPDBG(SCTP_DEBUG_INPUT1,
5598             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5599             stcb->asoc.peers_rwnd,
5600             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5601             stcb->asoc.total_flight);
5602         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5603         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5604                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5605         }
5606         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5607             cnt_ctrl_ready ||
5608             stcb->asoc.trigger_reset ||
5609             ((un_sent > 0) &&
5610             (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
5611                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5612                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5613                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5614         }
5615 #ifdef SCTP_AUDITING_ENABLED
5616         sctp_audit_log(0xE0, 3);
5617         sctp_auditing(2, inp, stcb, net);
5618 #endif
5619 out:
5620         if (stcb != NULL) {
5621                 SCTP_TCB_UNLOCK(stcb);
5622         }
5623         if (inp_decr != NULL) {
5624                 /* reduce ref-count */
5625                 SCTP_INP_WLOCK(inp_decr);
5626                 SCTP_INP_DECR_REF(inp_decr);
5627                 SCTP_INP_WUNLOCK(inp_decr);
5628         }
5629         return;
5630 }
5631
5632 #ifdef INET
5633 void
5634 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5635 {
5636         struct mbuf *m;
5637         int iphlen;
5638         uint32_t vrf_id = 0;
5639         uint8_t ecn_bits;
5640         struct sockaddr_in src, dst;
5641         struct ip *ip;
5642         struct sctphdr *sh;
5643         struct sctp_chunkhdr *ch;
5644         int length, offset;
5645         uint8_t compute_crc;
5646         uint32_t mflowid;
5647         uint8_t mflowtype;
5648         uint16_t fibnum;
5649
5650         iphlen = off;
5651         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5652                 SCTP_RELEASE_PKT(i_pak);
5653                 return;
5654         }
5655         m = SCTP_HEADER_TO_CHAIN(i_pak);
5656 #ifdef SCTP_MBUF_LOGGING
5657         /* Log in any input mbufs */
5658         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5659                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5660         }
5661 #endif
5662 #ifdef SCTP_PACKET_LOGGING
5663         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5664                 sctp_packet_log(m);
5665         }
5666 #endif
5667         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5668             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5669             m->m_pkthdr.len,
5670             if_name(m->m_pkthdr.rcvif),
5671             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5672         mflowid = m->m_pkthdr.flowid;
5673         mflowtype = M_HASHTYPE_GET(m);
5674         fibnum = M_GETFIB(m);
5675         SCTP_STAT_INCR(sctps_recvpackets);
5676         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5677         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5678         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5679         if (SCTP_BUF_LEN(m) < offset) {
5680                 if ((m = m_pullup(m, offset)) == NULL) {
5681                         SCTP_STAT_INCR(sctps_hdrops);
5682                         return;
5683                 }
5684         }
5685         ip = mtod(m, struct ip *);
5686         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5687         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5688         offset -= sizeof(struct sctp_chunkhdr);
5689         memset(&src, 0, sizeof(struct sockaddr_in));
5690         src.sin_family = AF_INET;
5691         src.sin_len = sizeof(struct sockaddr_in);
5692         src.sin_port = sh->src_port;
5693         src.sin_addr = ip->ip_src;
5694         memset(&dst, 0, sizeof(struct sockaddr_in));
5695         dst.sin_family = AF_INET;
5696         dst.sin_len = sizeof(struct sockaddr_in);
5697         dst.sin_port = sh->dest_port;
5698         dst.sin_addr = ip->ip_dst;
5699         length = ntohs(ip->ip_len);
5700         /* Validate mbuf chain length with IP payload length. */
5701         if (SCTP_HEADER_LEN(m) != length) {
5702                 SCTPDBG(SCTP_DEBUG_INPUT1,
5703                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5704                 SCTP_STAT_INCR(sctps_hdrops);
5705                 goto out;
5706         }
5707         /* SCTP does not allow broadcasts or multicasts */
5708         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5709                 goto out;
5710         }
5711         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5712                 goto out;
5713         }
5714         ecn_bits = ip->ip_tos;
5715         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5716                 SCTP_STAT_INCR(sctps_recvhwcrc);
5717                 compute_crc = 0;
5718         } else {
5719                 SCTP_STAT_INCR(sctps_recvswcrc);
5720                 compute_crc = 1;
5721         }
5722         sctp_common_input_processing(&m, iphlen, offset, length,
5723             (struct sockaddr *)&src,
5724             (struct sockaddr *)&dst,
5725             sh, ch,
5726             compute_crc,
5727             ecn_bits,
5728             mflowtype, mflowid, fibnum,
5729             vrf_id, port);
5730 out:
5731         if (m) {
5732                 sctp_m_freem(m);
5733         }
5734         return;
5735 }
5736
5737 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5738 extern int *sctp_cpuarry;
5739 #endif
5740
5741 int
5742 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
5743 {
5744         struct mbuf *m;
5745         int off;
5746
5747         m = *mp;
5748         off = *offp;
5749 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5750         if (mp_ncpus > 1) {
5751                 struct ip *ip;
5752                 struct sctphdr *sh;
5753                 int offset;
5754                 int cpu_to_use;
5755                 uint32_t flowid, tag;
5756
5757                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
5758                         flowid = m->m_pkthdr.flowid;
5759                 } else {
5760                         /*
5761                          * No flow id built by lower layers fix it so we
5762                          * create one.
5763                          */
5764                         offset = off + sizeof(struct sctphdr);
5765                         if (SCTP_BUF_LEN(m) < offset) {
5766                                 if ((m = m_pullup(m, offset)) == NULL) {
5767                                         SCTP_STAT_INCR(sctps_hdrops);
5768                                         return (IPPROTO_DONE);
5769                                 }
5770                         }
5771                         ip = mtod(m, struct ip *);
5772                         sh = (struct sctphdr *)((caddr_t)ip + off);
5773                         tag = htonl(sh->v_tag);
5774                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5775                         m->m_pkthdr.flowid = flowid;
5776                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
5777                 }
5778                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5779                 sctp_queue_to_mcore(m, off, cpu_to_use);
5780                 return (IPPROTO_DONE);
5781         }
5782 #endif
5783         sctp_input_with_port(m, off, 0);
5784         return (IPPROTO_DONE);
5785 }
5786 #endif