1 /*-
2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
4 * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * a) Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 *
12 * b) Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the distribution.
15 *
16 * c) Neither the name of Cisco Systems, Inc. nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30 * THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: releng/9.0/sys/netinet/sctp_input.c 224641 2011-08-03 20:21:00Z tuexen $");
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/udp.h>
53 #include <sys/smp.h>
54
55
56
57 static void
58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
59 {
60 struct sctp_nets *net;
61
62 /*
63 * This now not only stops all cookie timers it also stops any INIT
64 * timers as well. This will make sure that the timers are stopped
65 * in all collision cases.
66 */
67 SCTP_TCB_LOCK_ASSERT(stcb);
68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
71 stcb->sctp_ep,
72 stcb,
73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
76 stcb->sctp_ep,
77 stcb,
78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
79 }
80 }
81 }
82
83 /* INIT handler */
84 static void
85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
86 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
87 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port)
88 {
89 struct sctp_init *init;
90 struct mbuf *op_err;
91 uint32_t init_limit;
92
93 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
94 stcb);
95 if (stcb == NULL) {
96 SCTP_INP_RLOCK(inp);
97 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
98 goto outnow;
99 }
100 }
101 op_err = NULL;
102 init = &cp->init;
103 /* First are we accepting? */
104 if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) {
105 SCTPDBG(SCTP_DEBUG_INPUT2,
106 "sctp_handle_init: Abort, so_qlimit:%d\n",
107 inp->sctp_socket->so_qlimit);
108 /*
109 * FIX ME ?? What about TCP model and we have a
110 * match/restart case? Actually no fix is needed. the lookup
111 * will always find the existing assoc so stcb would not be
112 * NULL. It may be questionable to do this since we COULD
113 * just send back the INIT-ACK and hope that the app did
114 * accept()'s by the time the COOKIE was sent. But there is
115 * a price to pay for COOKIE generation and I don't want to
116 * pay it on the chance that the app will actually do some
117 * accepts(). The App just looses and should NOT be in this
118 * state :-)
119 */
120 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
121 vrf_id, port);
122 if (stcb)
123 *abort_no_unlock = 1;
124 goto outnow;
125 }
126 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
127 /* Invalid length */
128 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
129 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
130 vrf_id, port);
131 if (stcb)
132 *abort_no_unlock = 1;
133 goto outnow;
134 }
135 /* validate parameters */
136 if (init->initiate_tag == 0) {
137 /* protocol error... send abort */
138 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
139 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
140 vrf_id, port);
141 if (stcb)
142 *abort_no_unlock = 1;
143 goto outnow;
144 }
145 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
146 /* invalid parameter... send abort */
147 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
148 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
149 vrf_id, port);
150 if (stcb)
151 *abort_no_unlock = 1;
152 goto outnow;
153 }
154 if (init->num_inbound_streams == 0) {
155 /* protocol error... send abort */
156 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
157 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
158 vrf_id, port);
159 if (stcb)
160 *abort_no_unlock = 1;
161 goto outnow;
162 }
163 if (init->num_outbound_streams == 0) {
164 /* protocol error... send abort */
165 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
166 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
167 vrf_id, port);
168 if (stcb)
169 *abort_no_unlock = 1;
170 goto outnow;
171 }
172 init_limit = offset + ntohs(cp->ch.chunk_length);
173 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
174 init_limit)) {
175 /* auth parameter(s) error... send abort */
176 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port);
177 if (stcb)
178 *abort_no_unlock = 1;
179 goto outnow;
180 }
181 /* send an INIT-ACK w/cookie */
182 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
183 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port,
184 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
185 outnow:
186 if (stcb == NULL) {
187 SCTP_INP_RUNLOCK(inp);
188 }
189 }
190
191 /*
192 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
193 */
194
195 int
196 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
197 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
198 SCTP_UNUSED
199 #endif
200 )
201 {
202 int unsent_data = 0;
203 unsigned int i;
204 struct sctp_stream_queue_pending *sp;
205 struct sctp_association *asoc;
206
207 /*
208 * This function returns the number of streams that have true unsent
209 * data on them. Note that as it looks through it will clean up any
210 * places that have old data that has been sent but left at top of
211 * stream queue.
212 */
213 asoc = &stcb->asoc;
214 SCTP_TCB_SEND_LOCK(stcb);
215 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
216 /* Check to see if some data queued */
217 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
218 /* sa_ignore FREED_MEMORY */
219 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
220 if (sp == NULL) {
221 continue;
222 }
223 if ((sp->msg_is_complete) &&
224 (sp->length == 0) &&
225 (sp->sender_all_done)) {
226 /*
227 * We are doing differed cleanup. Last time
228 * through when we took all the data the
229 * sender_all_done was not set.
230 */
231 if (sp->put_last_out == 0) {
232 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
233 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
234 sp->sender_all_done,
235 sp->length,
236 sp->msg_is_complete,
237 sp->put_last_out);
238 }
239 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
240 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
241 if (sp->net) {
242 sctp_free_remote_addr(sp->net);
243 sp->net = NULL;
244 }
245 if (sp->data) {
246 sctp_m_freem(sp->data);
247 sp->data = NULL;
248 }
249 sctp_free_a_strmoq(stcb, sp, so_locked);
250 } else {
251 unsent_data++;
252 break;
253 }
254 }
255 }
256 SCTP_TCB_SEND_UNLOCK(stcb);
257 return (unsent_data);
258 }
259
260 static int
261 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb,
262 struct sctp_nets *net)
263 {
264 struct sctp_init *init;
265 struct sctp_association *asoc;
266 struct sctp_nets *lnet;
267 unsigned int i;
268
269 init = &cp->init;
270 asoc = &stcb->asoc;
271 /* save off parameters */
272 asoc->peer_vtag = ntohl(init->initiate_tag);
273 asoc->peers_rwnd = ntohl(init->a_rwnd);
274 /* init tsn's */
275 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
276
277 if (!TAILQ_EMPTY(&asoc->nets)) {
278 /* update any ssthresh's that may have a default */
279 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
280 lnet->ssthresh = asoc->peers_rwnd;
281 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
282 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
283 }
284 }
285 }
286 SCTP_TCB_SEND_LOCK(stcb);
287 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
288 unsigned int newcnt;
289 struct sctp_stream_out *outs;
290 struct sctp_stream_queue_pending *sp, *nsp;
291 struct sctp_tmit_chunk *chk, *nchk;
292
293 /* abandon the upper streams */
294 newcnt = ntohs(init->num_inbound_streams);
295 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
296 if (chk->rec.data.stream_number >= newcnt) {
297 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
298 asoc->send_queue_cnt--;
299 if (chk->data != NULL) {
300 sctp_free_bufspace(stcb, asoc, chk, 1);
301 sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb,
302 SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED);
303 if (chk->data) {
304 sctp_m_freem(chk->data);
305 chk->data = NULL;
306 }
307 }
308 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
309 /* sa_ignore FREED_MEMORY */
310 }
311 }
312 if (asoc->strmout) {
313 for (i = newcnt; i < asoc->pre_open_streams; i++) {
314 outs = &asoc->strmout[i];
315 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
316 TAILQ_REMOVE(&outs->outqueue, sp, next);
317 asoc->stream_queue_cnt--;
318 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
319 stcb, SCTP_NOTIFY_DATAGRAM_UNSENT,
320 sp, SCTP_SO_NOT_LOCKED);
321 if (sp->data) {
322 sctp_m_freem(sp->data);
323 sp->data = NULL;
324 }
325 if (sp->net) {
326 sctp_free_remote_addr(sp->net);
327 sp->net = NULL;
328 }
329 /* Free the chunk */
330 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
331 /* sa_ignore FREED_MEMORY */
332 }
333 }
334 }
335 /* cut back the count */
336 asoc->pre_open_streams = newcnt;
337 }
338 SCTP_TCB_SEND_UNLOCK(stcb);
339 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
340
341 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
342 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
343 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
344 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
345 }
346 /* This is the next one we expect */
347 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
348
349 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
350 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
351
352 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
353 /* open the requested streams */
354
355 if (asoc->strmin != NULL) {
356 /* Free the old ones */
357 struct sctp_queued_to_read *ctl, *nctl;
358
359 for (i = 0; i < asoc->streamincnt; i++) {
360 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
361 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
362 sctp_free_remote_addr(ctl->whoFrom);
363 ctl->whoFrom = NULL;
364 sctp_m_freem(ctl->data);
365 ctl->data = NULL;
366 sctp_free_a_readq(stcb, ctl);
367 }
368 }
369 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
370 }
371 asoc->streamincnt = ntohs(init->num_outbound_streams);
372 if (asoc->streamincnt > MAX_SCTP_STREAMS) {
373 asoc->streamincnt = MAX_SCTP_STREAMS;
374 }
375 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
376 sizeof(struct sctp_stream_in), SCTP_M_STRMI);
377 if (asoc->strmin == NULL) {
378 /* we didn't get memory for the streams! */
379 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
380 return (-1);
381 }
382 for (i = 0; i < asoc->streamincnt; i++) {
383 asoc->strmin[i].stream_no = i;
384 asoc->strmin[i].last_sequence_delivered = 0xffff;
385 /*
386 * U-stream ranges will be set when the cookie is unpacked.
387 * Or for the INIT sender they are un set (if pr-sctp not
388 * supported) when the INIT-ACK arrives.
389 */
390 TAILQ_INIT(&asoc->strmin[i].inqueue);
391 asoc->strmin[i].delivery_started = 0;
392 }
393 /*
394 * load_address_from_init will put the addresses into the
395 * association when the COOKIE is processed or the INIT-ACK is
396 * processed. Both types of COOKIE's existing and new call this
397 * routine. It will remove addresses that are no longer in the
398 * association (for the restarting case where addresses are
399 * removed). Up front when the INIT arrives we will discard it if it
400 * is a restart and new addresses have been added.
401 */
402 /* sa_ignore MEMLEAK */
403 return (0);
404 }
405
406 /*
407 * INIT-ACK message processing/consumption returns value < 0 on error
408 */
409 static int
410 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
411 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
412 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
413 {
414 struct sctp_association *asoc;
415 struct mbuf *op_err;
416 int retval, abort_flag;
417 uint32_t initack_limit;
418 int nat_friendly = 0;
419
420 /* First verify that we have no illegal param's */
421 abort_flag = 0;
422 op_err = NULL;
423
424 op_err = sctp_arethere_unrecognized_parameters(m,
425 (offset + sizeof(struct sctp_init_chunk)),
426 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
427 if (abort_flag) {
428 /* Send an abort and notify peer */
429 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED);
430 *abort_no_unlock = 1;
431 return (-1);
432 }
433 asoc = &stcb->asoc;
434 asoc->peer_supports_nat = (uint8_t) nat_friendly;
435 /* process the peer's parameters in the INIT-ACK */
436 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net);
437 if (retval < 0) {
438 return (retval);
439 }
440 initack_limit = offset + ntohs(cp->ch.chunk_length);
441 /* load all addresses */
442 if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen,
443 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
444 NULL))) {
445 /* Huh, we should abort */
446 SCTPDBG(SCTP_DEBUG_INPUT1,
447 "Load addresses from INIT causes an abort %d\n",
448 retval);
449 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
450 NULL, 0, net->port);
451 *abort_no_unlock = 1;
452 return (-1);
453 }
454 /* if the peer doesn't support asconf, flush the asconf queue */
455 if (asoc->peer_supports_asconf == 0) {
456 struct sctp_asconf_addr *param, *nparam;
457
458 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
459 TAILQ_REMOVE(&asoc->asconf_queue, param, next);
460 SCTP_FREE(param, SCTP_M_ASC_ADDR);
461 }
462 }
463 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
464 stcb->asoc.local_hmacs);
465 if (op_err) {
466 sctp_queue_op_err(stcb, op_err);
467 /* queuing will steal away the mbuf chain to the out queue */
468 op_err = NULL;
469 }
470 /* extract the cookie and queue it to "echo" it back... */
471 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
472 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
473 stcb->asoc.overall_error_count,
474 0,
475 SCTP_FROM_SCTP_INPUT,
476 __LINE__);
477 }
478 stcb->asoc.overall_error_count = 0;
479 net->error_count = 0;
480
481 /*
482 * Cancel the INIT timer, We do this first before queueing the
483 * cookie. We always cancel at the primary to assue that we are
484 * canceling the timer started by the INIT which always goes to the
485 * primary.
486 */
487 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
488 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
489
490 /* calculate the RTO */
491 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
492 SCTP_RTT_FROM_NON_DATA);
493
494 retval = sctp_send_cookie_echo(m, offset, stcb, net);
495 if (retval < 0) {
496 /*
497 * No cookie, we probably should send a op error. But in any
498 * case if there is no cookie in the INIT-ACK, we can
499 * abandon the peer, its broke.
500 */
501 if (retval == -3) {
502 /* We abort with an error of missing mandatory param */
503 op_err =
504 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
505 if (op_err) {
506 /*
507 * Expand beyond to include the mandatory
508 * param cookie
509 */
510 struct sctp_inv_mandatory_param *mp;
511
512 SCTP_BUF_LEN(op_err) =
513 sizeof(struct sctp_inv_mandatory_param);
514 mp = mtod(op_err,
515 struct sctp_inv_mandatory_param *);
516 /* Subtract the reserved param */
517 mp->length =
518 htons(sizeof(struct sctp_inv_mandatory_param) - 2);
519 mp->num_param = htonl(1);
520 mp->param = htons(SCTP_STATE_COOKIE);
521 mp->resv = 0;
522 }
523 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
524 sh, op_err, 0, net->port);
525 *abort_no_unlock = 1;
526 }
527 return (retval);
528 }
529 return (0);
530 }
531
532 static void
533 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
534 struct sctp_tcb *stcb, struct sctp_nets *net)
535 {
536 struct sockaddr_storage store;
537 struct sctp_nets *r_net, *f_net;
538 struct timeval tv;
539 int req_prim = 0;
540 uint16_t old_error_counter;
541
542 #ifdef INET
543 struct sockaddr_in *sin;
544
545 #endif
546 #ifdef INET6
547 struct sockaddr_in6 *sin6;
548
549 #endif
550
551 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
552 /* Invalid length */
553 return;
554 }
555 memset(&store, 0, sizeof(store));
556 switch (cp->heartbeat.hb_info.addr_family) {
557 #ifdef INET
558 case AF_INET:
559 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
560 sin = (struct sockaddr_in *)&store;
561 sin->sin_family = cp->heartbeat.hb_info.addr_family;
562 sin->sin_len = cp->heartbeat.hb_info.addr_len;
563 sin->sin_port = stcb->rport;
564 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
565 sizeof(sin->sin_addr));
566 } else {
567 return;
568 }
569 break;
570 #endif
571 #ifdef INET6
572 case AF_INET6:
573 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
574 sin6 = (struct sockaddr_in6 *)&store;
575 sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
576 sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
577 sin6->sin6_port = stcb->rport;
578 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
579 sizeof(sin6->sin6_addr));
580 } else {
581 return;
582 }
583 break;
584 #endif
585 default:
586 return;
587 }
588 r_net = sctp_findnet(stcb, (struct sockaddr *)&store);
589 if (r_net == NULL) {
590 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
591 return;
592 }
593 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
594 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
595 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
596 /*
597 * If the its a HB and it's random value is correct when can
598 * confirm the destination.
599 */
600 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
601 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
602 stcb->asoc.primary_destination = r_net;
603 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
604 f_net = TAILQ_FIRST(&stcb->asoc.nets);
605 if (f_net != r_net) {
606 /*
607 * first one on the list is NOT the primary
608 * sctp_cmpaddr() is much more efficent if
609 * the primary is the first on the list,
610 * make it so.
611 */
612 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
613 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
614 }
615 req_prim = 1;
616 }
617 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
618 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
619 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
620 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
621 }
622 old_error_counter = r_net->error_count;
623 r_net->error_count = 0;
624 r_net->hb_responded = 1;
625 tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
626 tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
627 /* Now lets do a RTO with this */
628 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
629 SCTP_RTT_FROM_NON_DATA);
630 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
631 r_net->dest_state |= SCTP_ADDR_REACHABLE;
632 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
633 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED);
634 }
635 if (r_net->dest_state & SCTP_ADDR_PF) {
636 r_net->dest_state &= ~SCTP_ADDR_PF;
637 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
638 }
639 if (old_error_counter > 0) {
640 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
641 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
642 }
643 if (r_net == stcb->asoc.primary_destination) {
644 if (stcb->asoc.alternate) {
645 /* release the alternate, primary is good */
646 sctp_free_remote_addr(stcb->asoc.alternate);
647 stcb->asoc.alternate = NULL;
648 }
649 }
650 /* Mobility adaptation */
651 if (req_prim) {
652 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
653 SCTP_MOBILITY_BASE) ||
654 sctp_is_mobility_feature_on(stcb->sctp_ep,
655 SCTP_MOBILITY_FASTHANDOFF)) &&
656 sctp_is_mobility_feature_on(stcb->sctp_ep,
657 SCTP_MOBILITY_PRIM_DELETED)) {
658
659 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
660 if (sctp_is_mobility_feature_on(stcb->sctp_ep,
661 SCTP_MOBILITY_FASTHANDOFF)) {
662 sctp_assoc_immediate_retrans(stcb,
663 stcb->asoc.primary_destination);
664 }
665 if (sctp_is_mobility_feature_on(stcb->sctp_ep,
666 SCTP_MOBILITY_BASE)) {
667 sctp_move_chunks_from_net(stcb,
668 stcb->asoc.deleted_primary);
669 }
670 sctp_delete_prim_timer(stcb->sctp_ep, stcb,
671 stcb->asoc.deleted_primary);
672 }
673 }
674 }
675
676 static int
677 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
678 {
679 /*
680 * return 0 means we want you to proceed with the abort non-zero
681 * means no abort processing
682 */
683 struct sctpasochead *head;
684
685 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
686 /* generate a new vtag and send init */
687 LIST_REMOVE(stcb, sctp_asocs);
688 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
689 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
690 /*
691 * put it in the bucket in the vtag hash of assoc's for the
692 * system
693 */
694 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
695 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
696 return (1);
697 }
698 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
699 /*
700 * treat like a case where the cookie expired i.e.: - dump
701 * current cookie. - generate a new vtag. - resend init.
702 */
703 /* generate a new vtag and send init */
704 LIST_REMOVE(stcb, sctp_asocs);
705 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
706 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
707 sctp_stop_all_cookie_timers(stcb);
708 sctp_toss_old_cookies(stcb, &stcb->asoc);
709 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
710 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
711 /*
712 * put it in the bucket in the vtag hash of assoc's for the
713 * system
714 */
715 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
716 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
717 return (1);
718 }
719 return (0);
720 }
721
722 static int
723 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
724 struct sctp_nets *net)
725 {
726 /*
727 * return 0 means we want you to proceed with the abort non-zero
728 * means no abort processing
729 */
730 if (stcb->asoc.peer_supports_auth == 0) {
731 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
732 return (0);
733 }
734 sctp_asconf_send_nat_state_update(stcb, net);
735 return (1);
736 }
737
738
739 static void
740 sctp_handle_abort(struct sctp_abort_chunk *cp,
741 struct sctp_tcb *stcb, struct sctp_nets *net)
742 {
743 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
744 struct socket *so;
745
746 #endif
747 uint16_t len;
748
749 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
750 if (stcb == NULL)
751 return;
752
753 len = ntohs(cp->ch.chunk_length);
754 if (len > sizeof(struct sctp_chunkhdr)) {
755 /*
756 * Need to check the cause codes for our two magic nat
757 * aborts which don't kill the assoc necessarily.
758 */
759 struct sctp_abort_chunk *cpnext;
760 struct sctp_missing_nat_state *natc;
761 uint16_t cause;
762
763 cpnext = cp;
764 cpnext++;
765 natc = (struct sctp_missing_nat_state *)cpnext;
766 cause = ntohs(natc->cause);
767 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) {
768 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
769 cp->ch.chunk_flags);
770 if (sctp_handle_nat_colliding_state(stcb)) {
771 return;
772 }
773 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) {
774 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
775 cp->ch.chunk_flags);
776 if (sctp_handle_nat_missing_state(stcb, net)) {
777 return;
778 }
779 }
780 }
781 /* stop any receive timers */
782 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
783 /* notify user of the abort and clean up... */
784 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
785 /* free the tcb */
786 #if defined(SCTP_PANIC_ON_ABORT)
787 printf("stcb:%p state:%d rport:%d net:%p\n",
788 stcb, stcb->asoc.state, stcb->rport, net);
789 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
790 panic("Received an ABORT");
791 } else {
792 printf("No panic its in state %x closed\n", stcb->asoc.state);
793 }
794 #endif
795 SCTP_STAT_INCR_COUNTER32(sctps_aborted);
796 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
797 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
798 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
799 }
800 #ifdef SCTP_ASOCLOG_OF_TSNS
801 sctp_print_out_track_log(stcb);
802 #endif
803 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
804 so = SCTP_INP_SO(stcb->sctp_ep);
805 atomic_add_int(&stcb->asoc.refcnt, 1);
806 SCTP_TCB_UNLOCK(stcb);
807 SCTP_SOCKET_LOCK(so, 1);
808 SCTP_TCB_LOCK(stcb);
809 atomic_subtract_int(&stcb->asoc.refcnt, 1);
810 #endif
811 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
812 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
813 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
814 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
815 SCTP_SOCKET_UNLOCK(so, 1);
816 #endif
817 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
818 }
819
820 static void
821 sctp_start_net_timers(struct sctp_tcb *stcb)
822 {
823 uint32_t cnt_hb_sent;
824 struct sctp_nets *net;
825
826 cnt_hb_sent = 0;
827 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
828 /*
829 * For each network start: 1) A pmtu timer. 2) A HB timer 3)
830 * If the dest in unconfirmed send a hb as well if under
831 * max_hb_burst have been sent.
832 */
833 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
834 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
835 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
836 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
837 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
838 cnt_hb_sent++;
839 }
840 }
841 if (cnt_hb_sent) {
842 sctp_chunk_output(stcb->sctp_ep, stcb,
843 SCTP_OUTPUT_FROM_COOKIE_ACK,
844 SCTP_SO_NOT_LOCKED);
845 }
846 }
847
848
849 static void
850 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
851 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
852 {
853 struct sctp_association *asoc;
854 int some_on_streamwheel;
855
856 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
857 struct socket *so;
858
859 #endif
860
861 SCTPDBG(SCTP_DEBUG_INPUT2,
862 "sctp_handle_shutdown: handling SHUTDOWN\n");
863 if (stcb == NULL)
864 return;
865 asoc = &stcb->asoc;
866 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
867 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
868 return;
869 }
870 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
871 /* Shutdown NOT the expected size */
872 return;
873 } else {
874 sctp_update_acked(stcb, cp, net, abort_flag);
875 if (*abort_flag) {
876 return;
877 }
878 }
879 if (asoc->control_pdapi) {
880 /*
881 * With a normal shutdown we assume the end of last record.
882 */
883 SCTP_INP_READ_LOCK(stcb->sctp_ep);
884 asoc->control_pdapi->end_added = 1;
885 asoc->control_pdapi->pdapi_aborted = 1;
886 asoc->control_pdapi = NULL;
887 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
888 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
889 so = SCTP_INP_SO(stcb->sctp_ep);
890 atomic_add_int(&stcb->asoc.refcnt, 1);
891 SCTP_TCB_UNLOCK(stcb);
892 SCTP_SOCKET_LOCK(so, 1);
893 SCTP_TCB_LOCK(stcb);
894 atomic_subtract_int(&stcb->asoc.refcnt, 1);
895 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
896 /* assoc was freed while we were unlocked */
897 SCTP_SOCKET_UNLOCK(so, 1);
898 return;
899 }
900 #endif
901 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
902 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
903 SCTP_SOCKET_UNLOCK(so, 1);
904 #endif
905 }
906 /* goto SHUTDOWN_RECEIVED state to block new requests */
907 if (stcb->sctp_socket) {
908 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
909 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
910 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
911 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
912 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
913 /*
914 * notify upper layer that peer has initiated a
915 * shutdown
916 */
917 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
918
919 /* reset time */
920 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
921 }
922 }
923 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
924 /*
925 * stop the shutdown timer, since we WILL move to
926 * SHUTDOWN-ACK-SENT.
927 */
928 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
929 }
930 /* Now is there unsent data on a stream somewhere? */
931 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
932
933 if (!TAILQ_EMPTY(&asoc->send_queue) ||
934 !TAILQ_EMPTY(&asoc->sent_queue) ||
935 some_on_streamwheel) {
936 /* By returning we will push more data out */
937 return;
938 } else {
939 /* no outstanding data to send, so move on... */
940 /* send SHUTDOWN-ACK */
941 sctp_send_shutdown_ack(stcb, net);
942 /* move to SHUTDOWN-ACK-SENT state */
943 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
944 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
945 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
946 }
947 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
948 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
949 sctp_stop_timers_for_shutdown(stcb);
950 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
951 stcb, net);
952 }
953 }
954
955 static void
956 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp,
957 struct sctp_tcb *stcb,
958 struct sctp_nets *net)
959 {
960 struct sctp_association *asoc;
961
962 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
963 struct socket *so;
964
965 so = SCTP_INP_SO(stcb->sctp_ep);
966 #endif
967 SCTPDBG(SCTP_DEBUG_INPUT2,
968 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
969 if (stcb == NULL)
970 return;
971
972 asoc = &stcb->asoc;
973 /* process according to association state */
974 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
975 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
976 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
977 sctp_send_shutdown_complete(stcb, net, 1);
978 SCTP_TCB_UNLOCK(stcb);
979 return;
980 }
981 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
982 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
983 /* unexpected SHUTDOWN-ACK... so ignore... */
984 SCTP_TCB_UNLOCK(stcb);
985 return;
986 }
987 if (asoc->control_pdapi) {
988 /*
989 * With a normal shutdown we assume the end of last record.
990 */
991 SCTP_INP_READ_LOCK(stcb->sctp_ep);
992 asoc->control_pdapi->end_added = 1;
993 asoc->control_pdapi->pdapi_aborted = 1;
994 asoc->control_pdapi = NULL;
995 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
996 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
997 atomic_add_int(&stcb->asoc.refcnt, 1);
998 SCTP_TCB_UNLOCK(stcb);
999 SCTP_SOCKET_LOCK(so, 1);
1000 SCTP_TCB_LOCK(stcb);
1001 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1002 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1003 /* assoc was freed while we were unlocked */
1004 SCTP_SOCKET_UNLOCK(so, 1);
1005 return;
1006 }
1007 #endif
1008 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1009 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1010 SCTP_SOCKET_UNLOCK(so, 1);
1011 #endif
1012 }
1013 /* are the queues empty? */
1014 if (!TAILQ_EMPTY(&asoc->send_queue) ||
1015 !TAILQ_EMPTY(&asoc->sent_queue) ||
1016 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1017 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
1018 }
1019 /* stop the timer */
1020 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1021 /* send SHUTDOWN-COMPLETE */
1022 sctp_send_shutdown_complete(stcb, net, 0);
1023 /* notify upper layer protocol */
1024 if (stcb->sctp_socket) {
1025 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1026 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1027 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1028 /* Set the connected flag to disconnected */
1029 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0;
1030 }
1031 }
1032 SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1033 /* free the TCB but first save off the ep */
1034 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1035 atomic_add_int(&stcb->asoc.refcnt, 1);
1036 SCTP_TCB_UNLOCK(stcb);
1037 SCTP_SOCKET_LOCK(so, 1);
1038 SCTP_TCB_LOCK(stcb);
1039 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1040 #endif
1041 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1042 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1043 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1044 SCTP_SOCKET_UNLOCK(so, 1);
1045 #endif
1046 }
1047
1048 /*
1049 * Skip past the param header and then we will find the chunk that caused the
1050 * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1051 * our peer must be broken.
1052 */
1053 static void
1054 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1055 struct sctp_nets *net)
1056 {
1057 struct sctp_chunkhdr *chk;
1058
1059 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1060 switch (chk->chunk_type) {
1061 case SCTP_ASCONF_ACK:
1062 case SCTP_ASCONF:
1063 sctp_asconf_cleanup(stcb, net);
1064 break;
1065 case SCTP_FORWARD_CUM_TSN:
1066 stcb->asoc.peer_supports_prsctp = 0;
1067 break;
1068 default:
1069 SCTPDBG(SCTP_DEBUG_INPUT2,
1070 "Peer does not support chunk type %d(%x)??\n",
1071 chk->chunk_type, (uint32_t) chk->chunk_type);
1072 break;
1073 }
1074 }
1075
1076 /*
1077 * Skip past the param header and then we will find the param that caused the
1078 * problem. There are a number of param's in a ASCONF OR the prsctp param
1079 * these will turn of specific features.
1080 */
1081 static void
1082 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1083 {
1084 struct sctp_paramhdr *pbad;
1085
1086 pbad = phdr + 1;
1087 switch (ntohs(pbad->param_type)) {
1088 /* pr-sctp draft */
1089 case SCTP_PRSCTP_SUPPORTED:
1090 stcb->asoc.peer_supports_prsctp = 0;
1091 break;
1092 case SCTP_SUPPORTED_CHUNK_EXT:
1093 break;
1094 /* draft-ietf-tsvwg-addip-sctp */
1095 case SCTP_HAS_NAT_SUPPORT:
1096 stcb->asoc.peer_supports_nat = 0;
1097 break;
1098 case SCTP_ADD_IP_ADDRESS:
1099 case SCTP_DEL_IP_ADDRESS:
1100 case SCTP_SET_PRIM_ADDR:
1101 stcb->asoc.peer_supports_asconf = 0;
1102 break;
1103 case SCTP_SUCCESS_REPORT:
1104 case SCTP_ERROR_CAUSE_IND:
1105 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1106 SCTPDBG(SCTP_DEBUG_INPUT2,
1107 "Turning off ASCONF to this strange peer\n");
1108 stcb->asoc.peer_supports_asconf = 0;
1109 break;
1110 default:
1111 SCTPDBG(SCTP_DEBUG_INPUT2,
1112 "Peer does not support param type %d(%x)??\n",
1113 pbad->param_type, (uint32_t) pbad->param_type);
1114 break;
1115 }
1116 }
1117
1118 static int
1119 sctp_handle_error(struct sctp_chunkhdr *ch,
1120 struct sctp_tcb *stcb, struct sctp_nets *net)
1121 {
1122 int chklen;
1123 struct sctp_paramhdr *phdr;
1124 uint16_t error_type;
1125 uint16_t error_len;
1126 struct sctp_association *asoc;
1127 int adjust;
1128
1129 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1130 struct socket *so;
1131
1132 #endif
1133
1134 /* parse through all of the errors and process */
1135 asoc = &stcb->asoc;
1136 phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1137 sizeof(struct sctp_chunkhdr));
1138 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1139 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1140 /* Process an Error Cause */
1141 error_type = ntohs(phdr->param_type);
1142 error_len = ntohs(phdr->param_length);
1143 if ((error_len > chklen) || (error_len == 0)) {
1144 /* invalid param length for this param */
1145 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1146 chklen, error_len);
1147 return (0);
1148 }
1149 switch (error_type) {
1150 case SCTP_CAUSE_INVALID_STREAM:
1151 case SCTP_CAUSE_MISSING_PARAM:
1152 case SCTP_CAUSE_INVALID_PARAM:
1153 case SCTP_CAUSE_NO_USER_DATA:
1154 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1155 error_type);
1156 break;
1157 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1158 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1159 ch->chunk_flags);
1160 if (sctp_handle_nat_colliding_state(stcb)) {
1161 return (0);
1162 }
1163 break;
1164 case SCTP_CAUSE_NAT_MISSING_STATE:
1165 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1166 ch->chunk_flags);
1167 if (sctp_handle_nat_missing_state(stcb, net)) {
1168 return (0);
1169 }
1170 break;
1171 case SCTP_CAUSE_STALE_COOKIE:
1172 /*
1173 * We only act if we have echoed a cookie and are
1174 * waiting.
1175 */
1176 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1177 int *p;
1178
1179 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1180 /* Save the time doubled */
1181 asoc->cookie_preserve_req = ntohl(*p) << 1;
1182 asoc->stale_cookie_count++;
1183 if (asoc->stale_cookie_count >
1184 asoc->max_init_times) {
1185 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
1186 /* now free the asoc */
1187 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1188 so = SCTP_INP_SO(stcb->sctp_ep);
1189 atomic_add_int(&stcb->asoc.refcnt, 1);
1190 SCTP_TCB_UNLOCK(stcb);
1191 SCTP_SOCKET_LOCK(so, 1);
1192 SCTP_TCB_LOCK(stcb);
1193 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1194 #endif
1195 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1196 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1197 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1198 SCTP_SOCKET_UNLOCK(so, 1);
1199 #endif
1200 return (-1);
1201 }
1202 /* blast back to INIT state */
1203 sctp_toss_old_cookies(stcb, &stcb->asoc);
1204 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1205 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1206 sctp_stop_all_cookie_timers(stcb);
1207 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1208 }
1209 break;
1210 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1211 /*
1212 * Nothing we can do here, we don't do hostname
1213 * addresses so if the peer does not like my IPv6
1214 * (or IPv4 for that matter) it does not matter. If
1215 * they don't support that type of address, they can
1216 * NOT possibly get that packet type... i.e. with no
1217 * IPv6 you can't recieve a IPv6 packet. so we can
1218 * safely ignore this one. If we ever added support
1219 * for HOSTNAME Addresses, then we would need to do
1220 * something here.
1221 */
1222 break;
1223 case SCTP_CAUSE_UNRECOG_CHUNK:
1224 sctp_process_unrecog_chunk(stcb, phdr, net);
1225 break;
1226 case SCTP_CAUSE_UNRECOG_PARAM:
1227 sctp_process_unrecog_param(stcb, phdr);
1228 break;
1229 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1230 /*
1231 * We ignore this since the timer will drive out a
1232 * new cookie anyway and there timer will drive us
1233 * to send a SHUTDOWN_COMPLETE. We can't send one
1234 * here since we don't have their tag.
1235 */
1236 break;
1237 case SCTP_CAUSE_DELETING_LAST_ADDR:
1238 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1239 case SCTP_CAUSE_DELETING_SRC_ADDR:
1240 /*
1241 * We should NOT get these here, but in a
1242 * ASCONF-ACK.
1243 */
1244 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1245 error_type);
1246 break;
1247 case SCTP_CAUSE_OUT_OF_RESC:
1248 /*
1249 * And what, pray tell do we do with the fact that
1250 * the peer is out of resources? Not really sure we
1251 * could do anything but abort. I suspect this
1252 * should have came WITH an abort instead of in a
1253 * OP-ERROR.
1254 */
1255 break;
1256 default:
1257 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1258 error_type);
1259 break;
1260 }
1261 adjust = SCTP_SIZE32(error_len);
1262 chklen -= adjust;
1263 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1264 }
1265 return (0);
1266 }
1267
1268 static int
1269 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1270 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1271 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
1272 {
1273 struct sctp_init_ack *init_ack;
1274 struct mbuf *op_err;
1275
1276 SCTPDBG(SCTP_DEBUG_INPUT2,
1277 "sctp_handle_init_ack: handling INIT-ACK\n");
1278
1279 if (stcb == NULL) {
1280 SCTPDBG(SCTP_DEBUG_INPUT2,
1281 "sctp_handle_init_ack: TCB is null\n");
1282 return (-1);
1283 }
1284 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1285 /* Invalid length */
1286 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1287 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1288 op_err, 0, net->port);
1289 *abort_no_unlock = 1;
1290 return (-1);
1291 }
1292 init_ack = &cp->init;
1293 /* validate parameters */
1294 if (init_ack->initiate_tag == 0) {
1295 /* protocol error... send an abort */
1296 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1297 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1298 op_err, 0, net->port);
1299 *abort_no_unlock = 1;
1300 return (-1);
1301 }
1302 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1303 /* protocol error... send an abort */
1304 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1305 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1306 op_err, 0, net->port);
1307 *abort_no_unlock = 1;
1308 return (-1);
1309 }
1310 if (init_ack->num_inbound_streams == 0) {
1311 /* protocol error... send an abort */
1312 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1313 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1314 op_err, 0, net->port);
1315 *abort_no_unlock = 1;
1316 return (-1);
1317 }
1318 if (init_ack->num_outbound_streams == 0) {
1319 /* protocol error... send an abort */
1320 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1321 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1322 op_err, 0, net->port);
1323 *abort_no_unlock = 1;
1324 return (-1);
1325 }
1326 /* process according to association state... */
1327 switch (stcb->asoc.state & SCTP_STATE_MASK) {
1328 case SCTP_STATE_COOKIE_WAIT:
1329 /* this is the expected state for this chunk */
1330 /* process the INIT-ACK parameters */
1331 if (stcb->asoc.primary_destination->dest_state &
1332 SCTP_ADDR_UNCONFIRMED) {
1333 /*
1334 * The primary is where we sent the INIT, we can
1335 * always consider it confirmed when the INIT-ACK is
1336 * returned. Do this before we load addresses
1337 * though.
1338 */
1339 stcb->asoc.primary_destination->dest_state &=
1340 ~SCTP_ADDR_UNCONFIRMED;
1341 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1342 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1343 }
1344 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb,
1345 net, abort_no_unlock, vrf_id) < 0) {
1346 /* error in parsing parameters */
1347 return (-1);
1348 }
1349 /* update our state */
1350 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1351 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1352
1353 /* reset the RTO calc */
1354 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1355 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1356 stcb->asoc.overall_error_count,
1357 0,
1358 SCTP_FROM_SCTP_INPUT,
1359 __LINE__);
1360 }
1361 stcb->asoc.overall_error_count = 0;
1362 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1363 /*
1364 * collapse the init timer back in case of a exponential
1365 * backoff
1366 */
1367 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1368 stcb, net);
1369 /*
1370 * the send at the end of the inbound data processing will
1371 * cause the cookie to be sent
1372 */
1373 break;
1374 case SCTP_STATE_SHUTDOWN_SENT:
1375 /* incorrect state... discard */
1376 break;
1377 case SCTP_STATE_COOKIE_ECHOED:
1378 /* incorrect state... discard */
1379 break;
1380 case SCTP_STATE_OPEN:
1381 /* incorrect state... discard */
1382 break;
1383 case SCTP_STATE_EMPTY:
1384 case SCTP_STATE_INUSE:
1385 default:
1386 /* incorrect state... discard */
1387 return (-1);
1388 break;
1389 }
1390 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1391 return (0);
1392 }
1393
1394 static struct sctp_tcb *
1395 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1396 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1397 struct sctp_inpcb *inp, struct sctp_nets **netp,
1398 struct sockaddr *init_src, int *notification,
1399 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1400 uint32_t vrf_id, uint16_t port);
1401
1402
1403 /*
1404 * handle a state cookie for an existing association m: input packet mbuf
1405 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1406 * "split" mbuf and the cookie signature does not exist offset: offset into
1407 * mbuf to the cookie-echo chunk
1408 */
1409 static struct sctp_tcb *
1410 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1411 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1412 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1413 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id,
1414 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port)
1415 {
1416 struct sctp_association *asoc;
1417 struct sctp_init_chunk *init_cp, init_buf;
1418 struct sctp_init_ack_chunk *initack_cp, initack_buf;
1419 struct sctp_nets *net;
1420 struct mbuf *op_err;
1421 struct sctp_paramhdr *ph;
1422 int chk_length;
1423 int init_offset, initack_offset, i;
1424 int retval;
1425 int spec_flag = 0;
1426 uint32_t how_indx;
1427
1428 net = *netp;
1429 /* I know that the TCB is non-NULL from the caller */
1430 asoc = &stcb->asoc;
1431 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1432 if (asoc->cookie_how[how_indx] == 0)
1433 break;
1434 }
1435 if (how_indx < sizeof(asoc->cookie_how)) {
1436 asoc->cookie_how[how_indx] = 1;
1437 }
1438 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1439 /* SHUTDOWN came in after sending INIT-ACK */
1440 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1441 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1442 0, M_DONTWAIT, 1, MT_DATA);
1443 if (op_err == NULL) {
1444 /* FOOBAR */
1445 return (NULL);
1446 }
1447 /* Set the len */
1448 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1449 ph = mtod(op_err, struct sctp_paramhdr *);
1450 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1451 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1452 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
1453 vrf_id, net->port);
1454 if (how_indx < sizeof(asoc->cookie_how))
1455 asoc->cookie_how[how_indx] = 2;
1456 return (NULL);
1457 }
1458 /*
1459 * find and validate the INIT chunk in the cookie (peer's info) the
1460 * INIT should start after the cookie-echo header struct (chunk
1461 * header, state cookie header struct)
1462 */
1463 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1464
1465 init_cp = (struct sctp_init_chunk *)
1466 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1467 (uint8_t *) & init_buf);
1468 if (init_cp == NULL) {
1469 /* could not pull a INIT chunk in cookie */
1470 return (NULL);
1471 }
1472 chk_length = ntohs(init_cp->ch.chunk_length);
1473 if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1474 return (NULL);
1475 }
1476 /*
1477 * find and validate the INIT-ACK chunk in the cookie (my info) the
1478 * INIT-ACK follows the INIT chunk
1479 */
1480 initack_offset = init_offset + SCTP_SIZE32(chk_length);
1481 initack_cp = (struct sctp_init_ack_chunk *)
1482 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1483 (uint8_t *) & initack_buf);
1484 if (initack_cp == NULL) {
1485 /* could not pull INIT-ACK chunk in cookie */
1486 return (NULL);
1487 }
1488 chk_length = ntohs(initack_cp->ch.chunk_length);
1489 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1490 return (NULL);
1491 }
1492 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1493 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1494 /*
1495 * case D in Section 5.2.4 Table 2: MMAA process accordingly
1496 * to get into the OPEN state
1497 */
1498 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1499 /*-
1500 * Opps, this means that we somehow generated two vtag's
1501 * the same. I.e. we did:
1502 * Us Peer
1503 * <---INIT(tag=a)------
1504 * ----INIT-ACK(tag=t)-->
1505 * ----INIT(tag=t)------> *1
1506 * <---INIT-ACK(tag=a)---
1507 * <----CE(tag=t)------------- *2
1508 *
1509 * At point *1 we should be generating a different
1510 * tag t'. Which means we would throw away the CE and send
1511 * ours instead. Basically this is case C (throw away side).
1512 */
1513 if (how_indx < sizeof(asoc->cookie_how))
1514 asoc->cookie_how[how_indx] = 17;
1515 return (NULL);
1516
1517 }
1518 switch SCTP_GET_STATE
1519 (asoc) {
1520 case SCTP_STATE_COOKIE_WAIT:
1521 case SCTP_STATE_COOKIE_ECHOED:
1522 /*
1523 * INIT was sent but got a COOKIE_ECHO with the
1524 * correct tags... just accept it...but we must
1525 * process the init so that we can make sure we have
1526 * the right seq no's.
1527 */
1528 /* First we must process the INIT !! */
1529 retval = sctp_process_init(init_cp, stcb, net);
1530 if (retval < 0) {
1531 if (how_indx < sizeof(asoc->cookie_how))
1532 asoc->cookie_how[how_indx] = 3;
1533 return (NULL);
1534 }
1535 /* we have already processed the INIT so no problem */
1536 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1537 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1538 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1539 /* update current state */
1540 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1541 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1542 else
1543 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1544
1545 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1546 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1547 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1548 stcb->sctp_ep, stcb, asoc->primary_destination);
1549 }
1550 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1551 sctp_stop_all_cookie_timers(stcb);
1552 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1553 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1554 (inp->sctp_socket->so_qlimit == 0)
1555 ) {
1556 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1557 struct socket *so;
1558
1559 #endif
1560 /*
1561 * Here is where collision would go if we
1562 * did a connect() and instead got a
1563 * init/init-ack/cookie done before the
1564 * init-ack came back..
1565 */
1566 stcb->sctp_ep->sctp_flags |=
1567 SCTP_PCB_FLAGS_CONNECTED;
1568 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1569 so = SCTP_INP_SO(stcb->sctp_ep);
1570 atomic_add_int(&stcb->asoc.refcnt, 1);
1571 SCTP_TCB_UNLOCK(stcb);
1572 SCTP_SOCKET_LOCK(so, 1);
1573 SCTP_TCB_LOCK(stcb);
1574 atomic_add_int(&stcb->asoc.refcnt, -1);
1575 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1576 SCTP_SOCKET_UNLOCK(so, 1);
1577 return (NULL);
1578 }
1579 #endif
1580 soisconnected(stcb->sctp_socket);
1581 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1582 SCTP_SOCKET_UNLOCK(so, 1);
1583 #endif
1584 }
1585 /* notify upper layer */
1586 *notification = SCTP_NOTIFY_ASSOC_UP;
1587 /*
1588 * since we did not send a HB make sure we don't
1589 * double things
1590 */
1591 net->hb_responded = 1;
1592 net->RTO = sctp_calculate_rto(stcb, asoc, net,
1593 &cookie->time_entered,
1594 sctp_align_unsafe_makecopy,
1595 SCTP_RTT_FROM_NON_DATA);
1596
1597 if (stcb->asoc.sctp_autoclose_ticks &&
1598 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1599 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1600 inp, stcb, NULL);
1601 }
1602 break;
1603 default:
1604 /*
1605 * we're in the OPEN state (or beyond), so peer must
1606 * have simply lost the COOKIE-ACK
1607 */
1608 break;
1609 } /* end switch */
1610 sctp_stop_all_cookie_timers(stcb);
1611 /*
1612 * We ignore the return code here.. not sure if we should
1613 * somehow abort.. but we do have an existing asoc. This
1614 * really should not fail.
1615 */
1616 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1617 init_offset + sizeof(struct sctp_init_chunk),
1618 initack_offset, sh, init_src)) {
1619 if (how_indx < sizeof(asoc->cookie_how))
1620 asoc->cookie_how[how_indx] = 4;
1621 return (NULL);
1622 }
1623 /* respond with a COOKIE-ACK */
1624 sctp_toss_old_cookies(stcb, asoc);
1625 sctp_send_cookie_ack(stcb);
1626 if (how_indx < sizeof(asoc->cookie_how))
1627 asoc->cookie_how[how_indx] = 5;
1628 return (stcb);
1629 }
1630 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1631 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1632 cookie->tie_tag_my_vtag == 0 &&
1633 cookie->tie_tag_peer_vtag == 0) {
1634 /*
1635 * case C in Section 5.2.4 Table 2: XMOO silently discard
1636 */
1637 if (how_indx < sizeof(asoc->cookie_how))
1638 asoc->cookie_how[how_indx] = 6;
1639 return (NULL);
1640 }
1641 /*
1642 * If nat support, and the below and stcb is established, send back
1643 * a ABORT(colliding state) if we are established.
1644 */
1645 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1646 (asoc->peer_supports_nat) &&
1647 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1648 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1649 (asoc->peer_vtag == 0)))) {
1650 /*
1651 * Special case - Peer's support nat. We may have two init's
1652 * that we gave out the same tag on since one was not
1653 * established.. i.e. we get INIT from host-1 behind the nat
1654 * and we respond tag-a, we get a INIT from host-2 behind
1655 * the nat and we get tag-a again. Then we bring up host-1
1656 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1657 * Now we have colliding state. We must send an abort here
1658 * with colliding state indication.
1659 */
1660 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1661 0, M_DONTWAIT, 1, MT_DATA);
1662 if (op_err == NULL) {
1663 /* FOOBAR */
1664 return (NULL);
1665 }
1666 /* pre-reserve some space */
1667 #ifdef INET6
1668 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1669 #else
1670 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1671 #endif
1672 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1673 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1674 /* Set the len */
1675 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1676 ph = mtod(op_err, struct sctp_paramhdr *);
1677 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1678 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1679 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port);
1680 return (NULL);
1681 }
1682 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1683 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1684 (asoc->peer_vtag == 0))) {
1685 /*
1686 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1687 * should be ok, re-accept peer info
1688 */
1689 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1690 /*
1691 * Extension of case C. If we hit this, then the
1692 * random number generator returned the same vtag
1693 * when we first sent our INIT-ACK and when we later
1694 * sent our INIT. The side with the seq numbers that
1695 * are different will be the one that normnally
1696 * would have hit case C. This in effect "extends"
1697 * our vtags in this collision case to be 64 bits.
1698 * The same collision could occur aka you get both
1699 * vtag and seq number the same twice in a row.. but
1700 * is much less likely. If it did happen then we
1701 * would proceed through and bring up the assoc.. we
1702 * may end up with the wrong stream setup however..
1703 * which would be bad.. but there is no way to
1704 * tell.. until we send on a stream that does not
1705 * exist :-)
1706 */
1707 if (how_indx < sizeof(asoc->cookie_how))
1708 asoc->cookie_how[how_indx] = 7;
1709
1710 return (NULL);
1711 }
1712 if (how_indx < sizeof(asoc->cookie_how))
1713 asoc->cookie_how[how_indx] = 8;
1714 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1715 sctp_stop_all_cookie_timers(stcb);
1716 /*
1717 * since we did not send a HB make sure we don't double
1718 * things
1719 */
1720 net->hb_responded = 1;
1721 if (stcb->asoc.sctp_autoclose_ticks &&
1722 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1723 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1724 NULL);
1725 }
1726 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1727 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1728
1729 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1730 /*
1731 * Ok the peer probably discarded our data (if we
1732 * echoed a cookie+data). So anything on the
1733 * sent_queue should be marked for retransmit, we
1734 * may not get something to kick us so it COULD
1735 * still take a timeout to move these.. but it can't
1736 * hurt to mark them.
1737 */
1738 struct sctp_tmit_chunk *chk;
1739
1740 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1741 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1742 chk->sent = SCTP_DATAGRAM_RESEND;
1743 sctp_flight_size_decrease(chk);
1744 sctp_total_flight_decrease(stcb, chk);
1745 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1746 spec_flag++;
1747 }
1748 }
1749
1750 }
1751 /* process the INIT info (peer's info) */
1752 retval = sctp_process_init(init_cp, stcb, net);
1753 if (retval < 0) {
1754 if (how_indx < sizeof(asoc->cookie_how))
1755 asoc->cookie_how[how_indx] = 9;
1756 return (NULL);
1757 }
1758 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1759 init_offset + sizeof(struct sctp_init_chunk),
1760 initack_offset, sh, init_src)) {
1761 if (how_indx < sizeof(asoc->cookie_how))
1762 asoc->cookie_how[how_indx] = 10;
1763 return (NULL);
1764 }
1765 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1766 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1767 *notification = SCTP_NOTIFY_ASSOC_UP;
1768
1769 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1770 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1771 (inp->sctp_socket->so_qlimit == 0)) {
1772 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1773 struct socket *so;
1774
1775 #endif
1776 stcb->sctp_ep->sctp_flags |=
1777 SCTP_PCB_FLAGS_CONNECTED;
1778 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1779 so = SCTP_INP_SO(stcb->sctp_ep);
1780 atomic_add_int(&stcb->asoc.refcnt, 1);
1781 SCTP_TCB_UNLOCK(stcb);
1782 SCTP_SOCKET_LOCK(so, 1);
1783 SCTP_TCB_LOCK(stcb);
1784 atomic_add_int(&stcb->asoc.refcnt, -1);
1785 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1786 SCTP_SOCKET_UNLOCK(so, 1);
1787 return (NULL);
1788 }
1789 #endif
1790 soisconnected(stcb->sctp_socket);
1791 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1792 SCTP_SOCKET_UNLOCK(so, 1);
1793 #endif
1794 }
1795 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1796 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1797 else
1798 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1799 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1800 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1801 SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1802 } else {
1803 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1804 }
1805 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1806 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1807 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1808 stcb->sctp_ep, stcb, asoc->primary_destination);
1809 }
1810 sctp_stop_all_cookie_timers(stcb);
1811 sctp_toss_old_cookies(stcb, asoc);
1812 sctp_send_cookie_ack(stcb);
1813 if (spec_flag) {
1814 /*
1815 * only if we have retrans set do we do this. What
1816 * this call does is get only the COOKIE-ACK out and
1817 * then when we return the normal call to
1818 * sctp_chunk_output will get the retrans out behind
1819 * this.
1820 */
1821 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1822 }
1823 if (how_indx < sizeof(asoc->cookie_how))
1824 asoc->cookie_how[how_indx] = 11;
1825
1826 return (stcb);
1827 }
1828 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1829 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1830 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1831 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1832 cookie->tie_tag_peer_vtag != 0) {
1833 struct sctpasochead *head;
1834
1835 if (asoc->peer_supports_nat) {
1836 /*
1837 * This is a gross gross hack. just call the
1838 * cookie_new code since we are allowing a duplicate
1839 * association. I hope this works...
1840 */
1841 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len,
1842 inp, netp, init_src, notification,
1843 auth_skipped, auth_offset, auth_len,
1844 vrf_id, port));
1845 }
1846 /*
1847 * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1848 */
1849 /* temp code */
1850 if (how_indx < sizeof(asoc->cookie_how))
1851 asoc->cookie_how[how_indx] = 12;
1852 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1853 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1854
1855 *sac_assoc_id = sctp_get_associd(stcb);
1856 /* notify upper layer */
1857 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1858 atomic_add_int(&stcb->asoc.refcnt, 1);
1859 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1860 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1861 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1862 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1863 }
1864 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1865 SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1866 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1867 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1868 }
1869 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1870 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1871 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1872 stcb->sctp_ep, stcb, asoc->primary_destination);
1873
1874 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1875 /* move to OPEN state, if not in SHUTDOWN_SENT */
1876 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1877 }
1878 asoc->pre_open_streams =
1879 ntohs(initack_cp->init.num_outbound_streams);
1880 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1881 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1882 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1883
1884 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1885
1886 asoc->str_reset_seq_in = asoc->init_seq_number;
1887
1888 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1889 if (asoc->mapping_array) {
1890 memset(asoc->mapping_array, 0,
1891 asoc->mapping_array_size);
1892 }
1893 if (asoc->nr_mapping_array) {
1894 memset(asoc->nr_mapping_array, 0,
1895 asoc->mapping_array_size);
1896 }
1897 SCTP_TCB_UNLOCK(stcb);
1898 SCTP_INP_INFO_WLOCK();
1899 SCTP_INP_WLOCK(stcb->sctp_ep);
1900 SCTP_TCB_LOCK(stcb);
1901 atomic_add_int(&stcb->asoc.refcnt, -1);
1902 /* send up all the data */
1903 SCTP_TCB_SEND_LOCK(stcb);
1904
1905 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED);
1906 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1907 stcb->asoc.strmout[i].stream_no = i;
1908 stcb->asoc.strmout[i].next_sequence_sent = 0;
1909 stcb->asoc.strmout[i].last_msg_incomplete = 0;
1910 }
1911 /* process the INIT-ACK info (my info) */
1912 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1913 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1914
1915 /* pull from vtag hash */
1916 LIST_REMOVE(stcb, sctp_asocs);
1917 /* re-insert to new vtag position */
1918 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1919 SCTP_BASE_INFO(hashasocmark))];
1920 /*
1921 * put it in the bucket in the vtag hash of assoc's for the
1922 * system
1923 */
1924 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1925
1926 /* process the INIT info (peer's info) */
1927 SCTP_TCB_SEND_UNLOCK(stcb);
1928 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1929 SCTP_INP_INFO_WUNLOCK();
1930
1931 retval = sctp_process_init(init_cp, stcb, net);
1932 if (retval < 0) {
1933 if (how_indx < sizeof(asoc->cookie_how))
1934 asoc->cookie_how[how_indx] = 13;
1935
1936 return (NULL);
1937 }
1938 /*
1939 * since we did not send a HB make sure we don't double
1940 * things
1941 */
1942 net->hb_responded = 1;
1943
1944 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1945 init_offset + sizeof(struct sctp_init_chunk),
1946 initack_offset, sh, init_src)) {
1947 if (how_indx < sizeof(asoc->cookie_how))
1948 asoc->cookie_how[how_indx] = 14;
1949
1950 return (NULL);
1951 }
1952 /* respond with a COOKIE-ACK */
1953 sctp_stop_all_cookie_timers(stcb);
1954 sctp_toss_old_cookies(stcb, asoc);
1955 sctp_send_cookie_ack(stcb);
1956 if (how_indx < sizeof(asoc->cookie_how))
1957 asoc->cookie_how[how_indx] = 15;
1958
1959 return (stcb);
1960 }
1961 if (how_indx < sizeof(asoc->cookie_how))
1962 asoc->cookie_how[how_indx] = 16;
1963 /* all other cases... */
1964 return (NULL);
1965 }
1966
1967
1968 /*
1969 * handle a state cookie for a new association m: input packet mbuf chain--
1970 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1971 * and the cookie signature does not exist offset: offset into mbuf to the
1972 * cookie-echo chunk length: length of the cookie chunk to: where the init
1973 * was from returns a new TCB
1974 */
1975 struct sctp_tcb *
1976 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1977 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1978 struct sctp_inpcb *inp, struct sctp_nets **netp,
1979 struct sockaddr *init_src, int *notification,
1980 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1981 uint32_t vrf_id, uint16_t port)
1982 {
1983 struct sctp_tcb *stcb;
1984 struct sctp_init_chunk *init_cp, init_buf;
1985 struct sctp_init_ack_chunk *initack_cp, initack_buf;
1986 struct sockaddr_storage sa_store;
1987 struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
1988 struct sctp_association *asoc;
1989 int chk_length;
1990 int init_offset, initack_offset, initack_limit;
1991 int retval;
1992 int error = 0;
1993 uint32_t old_tag;
1994 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
1995
1996 #ifdef INET
1997 struct sockaddr_in *sin;
1998
1999 #endif
2000 #ifdef INET6
2001 struct sockaddr_in6 *sin6;
2002
2003 #endif
2004 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2005 struct socket *so;
2006
2007 so = SCTP_INP_SO(inp);
2008 #endif
2009
2010 /*
2011 * find and validate the INIT chunk in the cookie (peer's info) the
2012 * INIT should start after the cookie-echo header struct (chunk
2013 * header, state cookie header struct)
2014 */
2015 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2016 init_cp = (struct sctp_init_chunk *)
2017 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2018 (uint8_t *) & init_buf);
2019 if (init_cp == NULL) {
2020 /* could not pull a INIT chunk in cookie */
2021 SCTPDBG(SCTP_DEBUG_INPUT1,
2022 "process_cookie_new: could not pull INIT chunk hdr\n");
2023 return (NULL);
2024 }
2025 chk_length = ntohs(init_cp->ch.chunk_length);
2026 if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2027 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2028 return (NULL);
2029 }
2030 initack_offset = init_offset + SCTP_SIZE32(chk_length);
2031 /*
2032 * find and validate the INIT-ACK chunk in the cookie (my info) the
2033 * INIT-ACK follows the INIT chunk
2034 */
2035 initack_cp = (struct sctp_init_ack_chunk *)
2036 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2037 (uint8_t *) & initack_buf);
2038 if (initack_cp == NULL) {
2039 /* could not pull INIT-ACK chunk in cookie */
2040 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2041 return (NULL);
2042 }
2043 chk_length = ntohs(initack_cp->ch.chunk_length);
2044 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2045 return (NULL);
2046 }
2047 /*
2048 * NOTE: We can't use the INIT_ACK's chk_length to determine the
2049 * "initack_limit" value. This is because the chk_length field
2050 * includes the length of the cookie, but the cookie is omitted when
2051 * the INIT and INIT_ACK are tacked onto the cookie...
2052 */
2053 initack_limit = offset + cookie_len;
2054
2055 /*
2056 * now that we know the INIT/INIT-ACK are in place, create a new TCB
2057 * and popluate
2058 */
2059
2060 /*
2061 * Here we do a trick, we set in NULL for the proc/thread argument.
2062 * We do this since in effect we only use the p argument when the
2063 * socket is unbound and we must do an implicit bind. Since we are
2064 * getting a cookie, we cannot be unbound.
2065 */
2066 stcb = sctp_aloc_assoc(inp, init_src, &error,
2067 ntohl(initack_cp->init.initiate_tag), vrf_id,
2068 (struct thread *)NULL
2069 );
2070 if (stcb == NULL) {
2071 struct mbuf *op_err;
2072
2073 /* memory problem? */
2074 SCTPDBG(SCTP_DEBUG_INPUT1,
2075 "process_cookie_new: no room for another TCB!\n");
2076 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2077
2078 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2079 sh, op_err, vrf_id, port);
2080 return (NULL);
2081 }
2082 /* get the correct sctp_nets */
2083 if (netp)
2084 *netp = sctp_findnet(stcb, init_src);
2085
2086 asoc = &stcb->asoc;
2087 /* get scope variables out of cookie */
2088 asoc->ipv4_local_scope = cookie->ipv4_scope;
2089 asoc->site_scope = cookie->site_scope;
2090 asoc->local_scope = cookie->local_scope;
2091 asoc->loopback_scope = cookie->loopback_scope;
2092
2093 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2094 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2095 struct mbuf *op_err;
2096
2097 /*
2098 * Houston we have a problem. The EP changed while the
2099 * cookie was in flight. Only recourse is to abort the
2100 * association.
2101 */
2102 atomic_add_int(&stcb->asoc.refcnt, 1);
2103 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2104 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2105 sh, op_err, vrf_id, port);
2106 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2107 SCTP_TCB_UNLOCK(stcb);
2108 SCTP_SOCKET_LOCK(so, 1);
2109 SCTP_TCB_LOCK(stcb);
2110 #endif
2111 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2112 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2113 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2114 SCTP_SOCKET_UNLOCK(so, 1);
2115 #endif
2116 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2117 return (NULL);
2118 }
2119 /* process the INIT-ACK info (my info) */
2120 old_tag = asoc->my_vtag;
2121 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2122 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2123 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2124 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2125 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2126 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2127 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2128 asoc->str_reset_seq_in = asoc->init_seq_number;
2129
2130 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2131
2132 /* process the INIT info (peer's info) */
2133 if (netp)
2134 retval = sctp_process_init(init_cp, stcb, *netp);
2135 else
2136 retval = 0;
2137 if (retval < 0) {
2138 atomic_add_int(&stcb->asoc.refcnt, 1);
2139 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2140 SCTP_TCB_UNLOCK(stcb);
2141 SCTP_SOCKET_LOCK(so, 1);
2142 SCTP_TCB_LOCK(stcb);
2143 #endif
2144 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2145 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2146 SCTP_SOCKET_UNLOCK(so, 1);
2147 #endif
2148 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2149 return (NULL);
2150 }
2151 /* load all addresses */
2152 if (sctp_load_addresses_from_init(stcb, m, iphlen,
2153 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
2154 init_src)) {
2155 atomic_add_int(&stcb->asoc.refcnt, 1);
2156 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2157 SCTP_TCB_UNLOCK(stcb);
2158 SCTP_SOCKET_LOCK(so, 1);
2159 SCTP_TCB_LOCK(stcb);
2160 #endif
2161 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2162 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2163 SCTP_SOCKET_UNLOCK(so, 1);
2164 #endif
2165 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2166 return (NULL);
2167 }
2168 /*
2169 * verify any preceding AUTH chunk that was skipped
2170 */
2171 /* pull the local authentication parameters from the cookie/init-ack */
2172 sctp_auth_get_cookie_params(stcb, m,
2173 initack_offset + sizeof(struct sctp_init_ack_chunk),
2174 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2175 if (auth_skipped) {
2176 struct sctp_auth_chunk *auth;
2177
2178 auth = (struct sctp_auth_chunk *)
2179 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2180 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2181 /* auth HMAC failed, dump the assoc and packet */
2182 SCTPDBG(SCTP_DEBUG_AUTH1,
2183 "COOKIE-ECHO: AUTH failed\n");
2184 atomic_add_int(&stcb->asoc.refcnt, 1);
2185 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2186 SCTP_TCB_UNLOCK(stcb);
2187 SCTP_SOCKET_LOCK(so, 1);
2188 SCTP_TCB_LOCK(stcb);
2189 #endif
2190 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2191 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2192 SCTP_SOCKET_UNLOCK(so, 1);
2193 #endif
2194 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2195 return (NULL);
2196 } else {
2197 /* remaining chunks checked... good to go */
2198 stcb->asoc.authenticated = 1;
2199 }
2200 }
2201 /* update current state */
2202 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2203 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2204 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2205 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2206 stcb->sctp_ep, stcb, asoc->primary_destination);
2207 }
2208 sctp_stop_all_cookie_timers(stcb);
2209 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2210 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2211
2212 /*
2213 * if we're doing ASCONFs, check to see if we have any new local
2214 * addresses that need to get added to the peer (eg. addresses
2215 * changed while cookie echo in flight). This needs to be done
2216 * after we go to the OPEN state to do the correct asconf
2217 * processing. else, make sure we have the correct addresses in our
2218 * lists
2219 */
2220
2221 /* warning, we re-use sin, sin6, sa_store here! */
2222 /* pull in local_address (our "from" address) */
2223 switch (cookie->laddr_type) {
2224 #ifdef INET
2225 case SCTP_IPV4_ADDRESS:
2226 /* source addr is IPv4 */
2227 sin = (struct sockaddr_in *)initack_src;
2228 memset(sin, 0, sizeof(*sin));
2229 sin->sin_family = AF_INET;
2230 sin->sin_len = sizeof(struct sockaddr_in);
2231 sin->sin_addr.s_addr = cookie->laddress[0];
2232 break;
2233 #endif
2234 #ifdef INET6
2235 case SCTP_IPV6_ADDRESS:
2236 /* source addr is IPv6 */
2237 sin6 = (struct sockaddr_in6 *)initack_src;
2238 memset(sin6, 0, sizeof(*sin6));
2239 sin6->sin6_family = AF_INET6;
2240 sin6->sin6_len = sizeof(struct sockaddr_in6);
2241 sin6->sin6_scope_id = cookie->scope_id;
2242 memcpy(&sin6->sin6_addr, cookie->laddress,
2243 sizeof(sin6->sin6_addr));
2244 break;
2245 #endif
2246 default:
2247 atomic_add_int(&stcb->asoc.refcnt, 1);
2248 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2249 SCTP_TCB_UNLOCK(stcb);
2250 SCTP_SOCKET_LOCK(so, 1);
2251 SCTP_TCB_LOCK(stcb);
2252 #endif
2253 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2254 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2255 SCTP_SOCKET_UNLOCK(so, 1);
2256 #endif
2257 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2258 return (NULL);
2259 }
2260
2261 /* set up to notify upper layer */
2262 *notification = SCTP_NOTIFY_ASSOC_UP;
2263 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2264 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2265 (inp->sctp_socket->so_qlimit == 0)) {
2266 /*
2267 * This is an endpoint that called connect() how it got a
2268 * cookie that is NEW is a bit of a mystery. It must be that
2269 * the INIT was sent, but before it got there.. a complete
2270 * INIT/INIT-ACK/COOKIE arrived. But of course then it
2271 * should have went to the other code.. not here.. oh well..
2272 * a bit of protection is worth having..
2273 */
2274 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2275 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2276 atomic_add_int(&stcb->asoc.refcnt, 1);
2277 SCTP_TCB_UNLOCK(stcb);
2278 SCTP_SOCKET_LOCK(so, 1);
2279 SCTP_TCB_LOCK(stcb);
2280 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2281 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2282 SCTP_SOCKET_UNLOCK(so, 1);
2283 return (NULL);
2284 }
2285 #endif
2286 soisconnected(stcb->sctp_socket);
2287 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2288 SCTP_SOCKET_UNLOCK(so, 1);
2289 #endif
2290 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2291 (inp->sctp_socket->so_qlimit)) {
2292 /*
2293 * We don't want to do anything with this one. Since it is
2294 * the listening guy. The timer will get started for
2295 * accepted connections in the caller.
2296 */
2297 ;
2298 }
2299 /* since we did not send a HB make sure we don't double things */
2300 if ((netp) && (*netp))
2301 (*netp)->hb_responded = 1;
2302
2303 if (stcb->asoc.sctp_autoclose_ticks &&
2304 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2305 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2306 }
2307 /* calculate the RTT */
2308 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2309 if ((netp) && (*netp)) {
2310 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2311 &cookie->time_entered, sctp_align_unsafe_makecopy,
2312 SCTP_RTT_FROM_NON_DATA);
2313 }
2314 /* respond with a COOKIE-ACK */
2315 sctp_send_cookie_ack(stcb);
2316
2317 /*
2318 * check the address lists for any ASCONFs that need to be sent
2319 * AFTER the cookie-ack is sent
2320 */
2321 sctp_check_address_list(stcb, m,
2322 initack_offset + sizeof(struct sctp_init_ack_chunk),
2323 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2324 initack_src, cookie->local_scope, cookie->site_scope,
2325 cookie->ipv4_scope, cookie->loopback_scope);
2326
2327
2328 return (stcb);
2329 }
2330
2331 /*
2332 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2333 * we NEED to make sure we are not already using the vtag. If so we
2334 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2335 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2336 SCTP_BASE_INFO(hashasocmark))];
2337 LIST_FOREACH(stcb, head, sctp_asocs) {
2338 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) {
2339 -- SEND ABORT - TRY AGAIN --
2340 }
2341 }
2342 */
2343
2344 /*
2345 * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2346 * existing (non-NULL) TCB
2347 */
2348 static struct mbuf *
2349 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2350 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2351 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2352 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2353 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port)
2354 {
2355 struct sctp_state_cookie *cookie;
2356 struct sctp_tcb *l_stcb = *stcb;
2357 struct sctp_inpcb *l_inp;
2358 struct sockaddr *to;
2359 sctp_assoc_t sac_restart_id;
2360 struct sctp_pcb *ep;
2361 struct mbuf *m_sig;
2362 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2363 uint8_t *sig;
2364 uint8_t cookie_ok = 0;
2365 unsigned int size_of_pkt, sig_offset, cookie_offset;
2366 unsigned int cookie_len;
2367 struct timeval now;
2368 struct timeval time_expires;
2369 struct sockaddr_storage dest_store;
2370 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
2371 struct ip *iph;
2372 int notification = 0;
2373 struct sctp_nets *netl;
2374 int had_a_existing_tcb = 0;
2375 int send_int_conf = 0;
2376
2377 #ifdef INET
2378 struct sockaddr_in sin;
2379
2380 #endif
2381 #ifdef INET6
2382 struct sockaddr_in6 sin6;
2383
2384 #endif
2385
2386 SCTPDBG(SCTP_DEBUG_INPUT2,
2387 "sctp_handle_cookie: handling COOKIE-ECHO\n");
2388
2389 if (inp_p == NULL) {
2390 return (NULL);
2391 }
2392 /* First get the destination address setup too. */
2393 iph = mtod(m, struct ip *);
2394 switch (iph->ip_v) {
2395 #ifdef INET
2396 case IPVERSION:
2397 {
2398 /* its IPv4 */
2399 struct sockaddr_in *lsin;
2400
2401 lsin = (struct sockaddr_in *)(localep_sa);
2402 memset(lsin, 0, sizeof(*lsin));
2403 lsin->sin_family = AF_INET;
2404 lsin->sin_len = sizeof(*lsin);
2405 lsin->sin_port = sh->dest_port;
2406 lsin->sin_addr.s_addr = iph->ip_dst.s_addr;
2407 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph);
2408 break;
2409 }
2410 #endif
2411 #ifdef INET6
2412 case IPV6_VERSION >> 4:
2413 {
2414 /* its IPv6 */
2415 struct ip6_hdr *ip6;
2416 struct sockaddr_in6 *lsin6;
2417
2418 lsin6 = (struct sockaddr_in6 *)(localep_sa);
2419 memset(lsin6, 0, sizeof(*lsin6));
2420 lsin6->sin6_family = AF_INET6;
2421 lsin6->sin6_len = sizeof(struct sockaddr_in6);
2422 ip6 = mtod(m, struct ip6_hdr *);
2423 lsin6->sin6_port = sh->dest_port;
2424 lsin6->sin6_addr = ip6->ip6_dst;
2425 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen;
2426 break;
2427 }
2428 #endif
2429 default:
2430 return (NULL);
2431 }
2432
2433 cookie = &cp->cookie;
2434 cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2435 cookie_len = ntohs(cp->ch.chunk_length);
2436
2437 if ((cookie->peerport != sh->src_port) &&
2438 (cookie->myport != sh->dest_port) &&
2439 (cookie->my_vtag != sh->v_tag)) {
2440 /*
2441 * invalid ports or bad tag. Note that we always leave the
2442 * v_tag in the header in network order and when we stored
2443 * it in the my_vtag slot we also left it in network order.
2444 * This maintains the match even though it may be in the
2445 * opposite byte order of the machine :->
2446 */
2447 return (NULL);
2448 }
2449 if (cookie_len > size_of_pkt ||
2450 cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2451 sizeof(struct sctp_init_chunk) +
2452 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2453 /* cookie too long! or too small */
2454 return (NULL);
2455 }
2456 /*
2457 * split off the signature into its own mbuf (since it should not be
2458 * calculated in the sctp_hmac_m() call).
2459 */
2460 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2461 if (sig_offset > size_of_pkt) {
2462 /* packet not correct size! */
2463 /* XXX this may already be accounted for earlier... */
2464 return (NULL);
2465 }
2466 m_sig = m_split(m, sig_offset, M_DONTWAIT);
2467 if (m_sig == NULL) {
2468 /* out of memory or ?? */
2469 return (NULL);
2470 }
2471 #ifdef SCTP_MBUF_LOGGING
2472 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2473 struct mbuf *mat;
2474
2475 mat = m_sig;
2476 while (mat) {
2477 if (SCTP_BUF_IS_EXTENDED(mat)) {
2478 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2479 }
2480 mat = SCTP_BUF_NEXT(mat);
2481 }
2482 }
2483 #endif
2484
2485 /*
2486 * compute the signature/digest for the cookie
2487 */
2488 ep = &(*inp_p)->sctp_ep;
2489 l_inp = *inp_p;
2490 if (l_stcb) {
2491 SCTP_TCB_UNLOCK(l_stcb);
2492 }
2493 SCTP_INP_RLOCK(l_inp);
2494 if (l_stcb) {
2495 SCTP_TCB_LOCK(l_stcb);
2496 }
2497 /* which cookie is it? */
2498 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2499 (ep->current_secret_number != ep->last_secret_number)) {
2500 /* it's the old cookie */
2501 (void)sctp_hmac_m(SCTP_HMAC,
2502 (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2503 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2504 } else {
2505 /* it's the current cookie */
2506 (void)sctp_hmac_m(SCTP_HMAC,
2507 (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2508 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2509 }
2510 /* get the signature */
2511 SCTP_INP_RUNLOCK(l_inp);
2512 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2513 if (sig == NULL) {
2514 /* couldn't find signature */
2515 sctp_m_freem(m_sig);
2516 return (NULL);
2517 }
2518 /* compare the received digest with the computed digest */
2519 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2520 /* try the old cookie? */
2521 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2522 (ep->current_secret_number != ep->last_secret_number)) {
2523 /* compute digest with old */
2524 (void)sctp_hmac_m(SCTP_HMAC,
2525 (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2526 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2527 /* compare */
2528 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2529 cookie_ok = 1;
2530 }
2531 } else {
2532 cookie_ok = 1;
2533 }
2534
2535 /*
2536 * Now before we continue we must reconstruct our mbuf so that
2537 * normal processing of any other chunks will work.
2538 */
2539 {
2540 struct mbuf *m_at;
2541
2542 m_at = m;
2543 while (SCTP_BUF_NEXT(m_at) != NULL) {
2544 m_at = SCTP_BUF_NEXT(m_at);
2545 }
2546 SCTP_BUF_NEXT(m_at) = m_sig;
2547 }
2548
2549 if (cookie_ok == 0) {
2550 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2551 SCTPDBG(SCTP_DEBUG_INPUT2,
2552 "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2553 (uint32_t) offset, cookie_offset, sig_offset);
2554 return (NULL);
2555 }
2556 /*
2557 * check the cookie timestamps to be sure it's not stale
2558 */
2559 (void)SCTP_GETTIME_TIMEVAL(&now);
2560 /* Expire time is in Ticks, so we convert to seconds */
2561 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2562 time_expires.tv_usec = cookie->time_entered.tv_usec;
2563 /*
2564 * TODO sctp_constants.h needs alternative time macros when _KERNEL
2565 * is undefined.
2566 */
2567 if (timevalcmp(&now, &time_expires, >)) {
2568 /* cookie is stale! */
2569 struct mbuf *op_err;
2570 struct sctp_stale_cookie_msg *scm;
2571 uint32_t tim;
2572
2573 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2574 0, M_DONTWAIT, 1, MT_DATA);
2575 if (op_err == NULL) {
2576 /* FOOBAR */
2577 return (NULL);
2578 }
2579 /* Set the len */
2580 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2581 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2582 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2583 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2584 (sizeof(uint32_t))));
2585 /* seconds to usec */
2586 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2587 /* add in usec */
2588 if (tim == 0)
2589 tim = now.tv_usec - cookie->time_entered.tv_usec;
2590 scm->time_usec = htonl(tim);
2591 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
2592 vrf_id, port);
2593 return (NULL);
2594 }
2595 /*
2596 * Now we must see with the lookup address if we have an existing
2597 * asoc. This will only happen if we were in the COOKIE-WAIT state
2598 * and a INIT collided with us and somewhere the peer sent the
2599 * cookie on another address besides the single address our assoc
2600 * had for him. In this case we will have one of the tie-tags set at
2601 * least AND the address field in the cookie can be used to look it
2602 * up.
2603 */
2604 to = NULL;
2605 switch (cookie->addr_type) {
2606 #ifdef INET6
2607 case SCTP_IPV6_ADDRESS:
2608 memset(&sin6, 0, sizeof(sin6));
2609 sin6.sin6_family = AF_INET6;
2610 sin6.sin6_len = sizeof(sin6);
2611 sin6.sin6_port = sh->src_port;
2612 sin6.sin6_scope_id = cookie->scope_id;
2613 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2614 sizeof(sin6.sin6_addr.s6_addr));
2615 to = (struct sockaddr *)&sin6;
2616 break;
2617 #endif
2618 #ifdef INET
2619 case SCTP_IPV4_ADDRESS:
2620 memset(&sin, 0, sizeof(sin));
2621 sin.sin_family = AF_INET;
2622 sin.sin_len = sizeof(sin);
2623 sin.sin_port = sh->src_port;
2624 sin.sin_addr.s_addr = cookie->address[0];
2625 to = (struct sockaddr *)&sin;
2626 break;
2627 #endif
2628 default:
2629 /* This should not happen */
2630 return (NULL);
2631 }
2632 if ((*stcb == NULL) && to) {
2633 /* Yep, lets check */
2634 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
2635 if (*stcb == NULL) {
2636 /*
2637 * We should have only got back the same inp. If we
2638 * got back a different ep we have a problem. The
2639 * original findep got back l_inp and now
2640 */
2641 if (l_inp != *inp_p) {
2642 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2643 }
2644 } else {
2645 if (*locked_tcb == NULL) {
2646 /*
2647 * In this case we found the assoc only
2648 * after we locked the create lock. This
2649 * means we are in a colliding case and we
2650 * must make sure that we unlock the tcb if
2651 * its one of the cases where we throw away
2652 * the incoming packets.
2653 */
2654 *locked_tcb = *stcb;
2655
2656 /*
2657 * We must also increment the inp ref count
2658 * since the ref_count flags was set when we
2659 * did not find the TCB, now we found it
2660 * which reduces the refcount.. we must
2661 * raise it back out to balance it all :-)
2662 */
2663 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2664 if ((*stcb)->sctp_ep != l_inp) {
2665 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2666 (*stcb)->sctp_ep, l_inp);
2667 }
2668 }
2669 }
2670 }
2671 if (to == NULL) {
2672 return (NULL);
2673 }
2674 cookie_len -= SCTP_SIGNATURE_SIZE;
2675 if (*stcb == NULL) {
2676 /* this is the "normal" case... get a new TCB */
2677 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
2678 cookie_len, *inp_p, netp, to, ¬ification,
2679 auth_skipped, auth_offset, auth_len, vrf_id, port);
2680 } else {
2681 /* this is abnormal... cookie-echo on existing TCB */
2682 had_a_existing_tcb = 1;
2683 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
2684 cookie, cookie_len, *inp_p, *stcb, netp, to,
2685 ¬ification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port);
2686 }
2687
2688 if (*stcb == NULL) {
2689 /* still no TCB... must be bad cookie-echo */
2690 return (NULL);
2691 }
2692 if ((*netp != NULL) && (m->m_flags & M_FLOWID)) {
2693 (*netp)->flowid = m->m_pkthdr.flowid;
2694 #ifdef INVARIANTS
2695 (*netp)->flowidset = 1;
2696 #endif
2697 }
2698 /*
2699 * Ok, we built an association so confirm the address we sent the
2700 * INIT-ACK to.
2701 */
2702 netl = sctp_findnet(*stcb, to);
2703 /*
2704 * This code should in theory NOT run but
2705 */
2706 if (netl == NULL) {
2707 /* TSNH! Huh, why do I need to add this address here? */
2708 int ret;
2709
2710 ret = sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE,
2711 SCTP_IN_COOKIE_PROC);
2712 netl = sctp_findnet(*stcb, to);
2713 }
2714 if (netl) {
2715 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2716 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2717 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2718 netl);
2719 send_int_conf = 1;
2720 }
2721 }
2722 sctp_start_net_timers(*stcb);
2723 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2724 if (!had_a_existing_tcb ||
2725 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2726 /*
2727 * If we have a NEW cookie or the connect never
2728 * reached the connected state during collision we
2729 * must do the TCP accept thing.
2730 */
2731 struct socket *so, *oso;
2732 struct sctp_inpcb *inp;
2733
2734 if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2735 /*
2736 * For a restart we will keep the same
2737 * socket, no need to do anything. I THINK!!
2738 */
2739 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED);
2740 if (send_int_conf) {
2741 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2742 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2743 }
2744 return (m);
2745 }
2746 oso = (*inp_p)->sctp_socket;
2747 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2748 SCTP_TCB_UNLOCK((*stcb));
2749 CURVNET_SET(oso->so_vnet);
2750 so = sonewconn(oso, 0
2751 );
2752 CURVNET_RESTORE();
2753 SCTP_TCB_LOCK((*stcb));
2754 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2755
2756 if (so == NULL) {
2757 struct mbuf *op_err;
2758
2759 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2760 struct socket *pcb_so;
2761
2762 #endif
2763 /* Too many sockets */
2764 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2765 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2766 sctp_abort_association(*inp_p, NULL, m, iphlen,
2767 sh, op_err, vrf_id, port);
2768 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2769 pcb_so = SCTP_INP_SO(*inp_p);
2770 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2771 SCTP_TCB_UNLOCK((*stcb));
2772 SCTP_SOCKET_LOCK(pcb_so, 1);
2773 SCTP_TCB_LOCK((*stcb));
2774 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2775 #endif
2776 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2777 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2778 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2779 #endif
2780 return (NULL);
2781 }
2782 inp = (struct sctp_inpcb *)so->so_pcb;
2783 SCTP_INP_INCR_REF(inp);
2784 /*
2785 * We add the unbound flag here so that if we get an
2786 * soabort() before we get the move_pcb done, we
2787 * will properly cleanup.
2788 */
2789 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2790 SCTP_PCB_FLAGS_CONNECTED |
2791 SCTP_PCB_FLAGS_IN_TCPPOOL |
2792 SCTP_PCB_FLAGS_UNBOUND |
2793 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2794 SCTP_PCB_FLAGS_DONT_WAKE);
2795 inp->sctp_features = (*inp_p)->sctp_features;
2796 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2797 inp->sctp_socket = so;
2798 inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2799 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2800 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable;
2801 inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2802 inp->sctp_context = (*inp_p)->sctp_context;
2803 inp->inp_starting_point_for_iterator = NULL;
2804 /*
2805 * copy in the authentication parameters from the
2806 * original endpoint
2807 */
2808 if (inp->sctp_ep.local_hmacs)
2809 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2810 inp->sctp_ep.local_hmacs =
2811 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2812 if (inp->sctp_ep.local_auth_chunks)
2813 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2814 inp->sctp_ep.local_auth_chunks =
2815 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2816
2817 /*
2818 * Now we must move it from one hash table to
2819 * another and get the tcb in the right place.
2820 */
2821
2822 /*
2823 * This is where the one-2-one socket is put into
2824 * the accept state waiting for the accept!
2825 */
2826 if (*stcb) {
2827 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2828 }
2829 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2830
2831 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2832 SCTP_TCB_UNLOCK((*stcb));
2833
2834 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2835 0);
2836 SCTP_TCB_LOCK((*stcb));
2837 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2838
2839
2840 /*
2841 * now we must check to see if we were aborted while
2842 * the move was going on and the lock/unlock
2843 * happened.
2844 */
2845 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2846 /*
2847 * yep it was, we leave the assoc attached
2848 * to the socket since the sctp_inpcb_free()
2849 * call will send an abort for us.
2850 */
2851 SCTP_INP_DECR_REF(inp);
2852 return (NULL);
2853 }
2854 SCTP_INP_DECR_REF(inp);
2855 /* Switch over to the new guy */
2856 *inp_p = inp;
2857 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2858 if (send_int_conf) {
2859 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2860 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2861 }
2862 /*
2863 * Pull it from the incomplete queue and wake the
2864 * guy
2865 */
2866 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2867 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2868 SCTP_TCB_UNLOCK((*stcb));
2869 SCTP_SOCKET_LOCK(so, 1);
2870 #endif
2871 soisconnected(so);
2872 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2873 SCTP_TCB_LOCK((*stcb));
2874 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2875 SCTP_SOCKET_UNLOCK(so, 1);
2876 #endif
2877 return (m);
2878 }
2879 }
2880 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) {
2881 if (notification) {
2882 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2883 }
2884 if (send_int_conf) {
2885 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2886 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2887 }
2888 }
2889 return (m);
2890 }
2891
2892 static void
2893 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp,
2894 struct sctp_tcb *stcb, struct sctp_nets *net)
2895 {
2896 /* cp must not be used, others call this without a c-ack :-) */
2897 struct sctp_association *asoc;
2898
2899 SCTPDBG(SCTP_DEBUG_INPUT2,
2900 "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2901 if (stcb == NULL)
2902 return;
2903
2904 asoc = &stcb->asoc;
2905
2906 sctp_stop_all_cookie_timers(stcb);
2907 /* process according to association state */
2908 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2909 /* state change only needed when I am in right state */
2910 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2911 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2912 sctp_start_net_timers(stcb);
2913 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2914 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2915 stcb->sctp_ep, stcb, asoc->primary_destination);
2916
2917 }
2918 /* update RTO */
2919 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2920 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2921 if (asoc->overall_error_count == 0) {
2922 net->RTO = sctp_calculate_rto(stcb, asoc, net,
2923 &asoc->time_entered, sctp_align_safe_nocopy,
2924 SCTP_RTT_FROM_NON_DATA);
2925 }
2926 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2927 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2928 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2929 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2930 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2931 struct socket *so;
2932
2933 #endif
2934 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2935 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2936 so = SCTP_INP_SO(stcb->sctp_ep);
2937 atomic_add_int(&stcb->asoc.refcnt, 1);
2938 SCTP_TCB_UNLOCK(stcb);
2939 SCTP_SOCKET_LOCK(so, 1);
2940 SCTP_TCB_LOCK(stcb);
2941 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2942 #endif
2943 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2944 soisconnected(stcb->sctp_socket);
2945 }
2946 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2947 SCTP_SOCKET_UNLOCK(so, 1);
2948 #endif
2949 }
2950 /*
2951 * since we did not send a HB make sure we don't double
2952 * things
2953 */
2954 net->hb_responded = 1;
2955
2956 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2957 /*
2958 * We don't need to do the asconf thing, nor hb or
2959 * autoclose if the socket is closed.
2960 */
2961 goto closed_socket;
2962 }
2963 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2964 stcb, net);
2965
2966
2967 if (stcb->asoc.sctp_autoclose_ticks &&
2968 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2969 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2970 stcb->sctp_ep, stcb, NULL);
2971 }
2972 /*
2973 * send ASCONF if parameters are pending and ASCONFs are
2974 * allowed (eg. addresses changed when init/cookie echo were
2975 * in flight)
2976 */
2977 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2978 (stcb->asoc.peer_supports_asconf) &&
2979 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2980 #ifdef SCTP_TIMER_BASED_ASCONF
2981 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2982 stcb->sctp_ep, stcb,
2983 stcb->asoc.primary_destination);
2984 #else
2985 sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2986 SCTP_ADDR_NOT_LOCKED);
2987 #endif
2988 }
2989 }
2990 closed_socket:
2991 /* Toss the cookie if I can */
2992 sctp_toss_old_cookies(stcb, asoc);
2993 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2994 /* Restart the timer if we have pending data */
2995 struct sctp_tmit_chunk *chk;
2996
2997 chk = TAILQ_FIRST(&asoc->sent_queue);
2998 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2999 }
3000 }
3001
3002 static void
3003 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3004 struct sctp_tcb *stcb)
3005 {
3006 struct sctp_nets *net;
3007 struct sctp_tmit_chunk *lchk;
3008 struct sctp_ecne_chunk bkup;
3009 uint8_t override_bit = 0;
3010 uint32_t tsn, window_data_tsn;
3011 int len;
3012 unsigned int pkt_cnt;
3013
3014 len = ntohs(cp->ch.chunk_length);
3015 if ((len != sizeof(struct sctp_ecne_chunk)) &&
3016 (len != sizeof(struct old_sctp_ecne_chunk))) {
3017 return;
3018 }
3019 if (len == sizeof(struct old_sctp_ecne_chunk)) {
3020 /* Its the old format */
3021 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3022 bkup.num_pkts_since_cwr = htonl(1);
3023 cp = &bkup;
3024 }
3025 SCTP_STAT_INCR(sctps_recvecne);
3026 tsn = ntohl(cp->tsn);
3027 pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3028 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3029 if (lchk == NULL) {
3030 window_data_tsn = stcb->asoc.sending_seq - 1;
3031 } else {
3032 window_data_tsn = lchk->rec.data.TSN_seq;
3033 }
3034
3035 /* Find where it was sent to if possible. */
3036 net = NULL;
3037 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3038 if (lchk->rec.data.TSN_seq == tsn) {
3039 net = lchk->whoTo;
3040 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3041 break;
3042 }
3043 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3044 break;
3045 }
3046 }
3047 if (net == NULL) {
3048 /*
3049 * What to do. A previous send of a CWR was possibly lost.
3050 * See how old it is, we may have it marked on the actual
3051 * net.
3052 */
3053 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3054 if (tsn == net->last_cwr_tsn) {
3055 /* Found him, send it off */
3056 goto out;
3057 }
3058 }
3059 /*
3060 * If we reach here, we need to send a special CWR that says
3061 * hey, we did this a long time ago and you lost the
3062 * response.
3063 */
3064 net = TAILQ_FIRST(&stcb->asoc.nets);
3065 override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3066 }
3067 out:
3068 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3069 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3070 /*
3071 * JRS - Use the congestion control given in the pluggable
3072 * CC module
3073 */
3074 int ocwnd;
3075
3076 ocwnd = net->cwnd;
3077 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3078 /*
3079 * We reduce once every RTT. So we will only lower cwnd at
3080 * the next sending seq i.e. the window_data_tsn
3081 */
3082 net->cwr_window_tsn = window_data_tsn;
3083 net->ecn_ce_pkt_cnt += pkt_cnt;
3084 net->lost_cnt = pkt_cnt;
3085 net->last_cwr_tsn = tsn;
3086 } else {
3087 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3088 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3089 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3090 /*
3091 * Another loss in the same window update how many
3092 * marks/packets lost we have had.
3093 */
3094 int cnt = 1;
3095
3096 if (pkt_cnt > net->lost_cnt) {
3097 /* Should be the case */
3098 cnt = (pkt_cnt - net->lost_cnt);
3099 net->ecn_ce_pkt_cnt += cnt;
3100 }
3101 net->lost_cnt = pkt_cnt;
3102 net->last_cwr_tsn = tsn;
3103 /*
3104 * Most CC functions will ignore this call, since we
3105 * are in-window yet of the initial CE the peer saw.
3106 */
3107 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3108 }
3109 }
3110 /*
3111 * We always send a CWR this way if our previous one was lost our
3112 * peer will get an update, or if it is not time again to reduce we
3113 * still get the cwr to the peer. Note we set the override when we
3114 * could not find the TSN on the chunk or the destination network.
3115 */
3116 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3117 }
3118
3119 static void
3120 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3121 {
3122 /*
3123 * Here we get a CWR from the peer. We must look in the outqueue and
3124 * make sure that we have a covered ECNE in teh control chunk part.
3125 * If so remove it.
3126 */
3127 struct sctp_tmit_chunk *chk;
3128 struct sctp_ecne_chunk *ecne;
3129 int override;
3130 uint32_t cwr_tsn;
3131
3132 cwr_tsn = ntohl(cp->tsn);
3133
3134 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3135 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3136 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3137 continue;
3138 }
3139 if ((override == 0) && (chk->whoTo != net)) {
3140 /* Must be from the right src unless override is set */
3141 continue;
3142 }
3143 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3144 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3145 /* this covers this ECNE, we can remove it */
3146 stcb->asoc.ecn_echo_cnt_onq--;
3147 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3148 sctp_next);
3149 if (chk->data) {
3150 sctp_m_freem(chk->data);
3151 chk->data = NULL;
3152 }
3153 stcb->asoc.ctrl_queue_cnt--;
3154 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3155 if (override == 0) {
3156 break;
3157 }
3158 }
3159 }
3160 }
3161
3162 static void
3163 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp,
3164 struct sctp_tcb *stcb, struct sctp_nets *net)
3165 {
3166 struct sctp_association *asoc;
3167
3168 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3169 struct socket *so;
3170
3171 #endif
3172
3173 SCTPDBG(SCTP_DEBUG_INPUT2,
3174 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3175 if (stcb == NULL)
3176 return;
3177
3178 asoc = &stcb->asoc;
3179 /* process according to association state */
3180 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3181 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3182 SCTPDBG(SCTP_DEBUG_INPUT2,
3183 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3184 SCTP_TCB_UNLOCK(stcb);
3185 return;
3186 }
3187 /* notify upper layer protocol */
3188 if (stcb->sctp_socket) {
3189 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3190 /* are the queues empty? they should be */
3191 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3192 !TAILQ_EMPTY(&asoc->sent_queue) ||
3193 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3194 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
3195 }
3196 }
3197 /* stop the timer */
3198 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3199 SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3200 /* free the TCB */
3201 SCTPDBG(SCTP_DEBUG_INPUT2,
3202 "sctp_handle_shutdown_complete: calls free-asoc\n");
3203 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3204 so = SCTP_INP_SO(stcb->sctp_ep);
3205 atomic_add_int(&stcb->asoc.refcnt, 1);
3206 SCTP_TCB_UNLOCK(stcb);
3207 SCTP_SOCKET_LOCK(so, 1);
3208 SCTP_TCB_LOCK(stcb);
3209 atomic_subtract_int(&stcb->asoc.refcnt, 1);
3210 #endif
3211 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3212 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3213 SCTP_SOCKET_UNLOCK(so, 1);
3214 #endif
3215 return;
3216 }
3217
3218 static int
3219 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3220 struct sctp_nets *net, uint8_t flg)
3221 {
3222 switch (desc->chunk_type) {
3223 case SCTP_DATA:
3224 /* find the tsn to resend (possibly */
3225 {
3226 uint32_t tsn;
3227 struct sctp_tmit_chunk *tp1;
3228
3229 tsn = ntohl(desc->tsn_ifany);
3230 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3231 if (tp1->rec.data.TSN_seq == tsn) {
3232 /* found it */
3233 break;
3234 }
3235 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3236 /* not found */
3237 tp1 = NULL;
3238 break;
3239 }
3240 }
3241 if (tp1 == NULL) {
3242 /*
3243 * Do it the other way , aka without paying
3244 * attention to queue seq order.
3245 */
3246 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3247 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3248 if (tp1->rec.data.TSN_seq == tsn) {
3249 /* found it */
3250 break;
3251 }
3252 }
3253 }
3254 if (tp1 == NULL) {
3255 SCTP_STAT_INCR(sctps_pdrptsnnf);
3256 }
3257 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3258 uint8_t *ddp;
3259
3260 if (((flg & SCTP_BADCRC) == 0) &&
3261 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3262 return (0);
3263 }
3264 if ((stcb->asoc.peers_rwnd == 0) &&
3265 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3266 SCTP_STAT_INCR(sctps_pdrpdiwnp);
3267 return (0);
3268 }
3269 if (stcb->asoc.peers_rwnd == 0 &&
3270 (flg & SCTP_FROM_MIDDLE_BOX)) {
3271 SCTP_STAT_INCR(sctps_pdrpdizrw);
3272 return (0);
3273 }
3274 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3275 sizeof(struct sctp_data_chunk));
3276 {
3277 unsigned int iii;
3278
3279 for (iii = 0; iii < sizeof(desc->data_bytes);
3280 iii++) {
3281 if (ddp[iii] != desc->data_bytes[iii]) {
3282 SCTP_STAT_INCR(sctps_pdrpbadd);
3283 return (-1);
3284 }
3285 }
3286 }
3287
3288 if (tp1->do_rtt) {
3289 /*
3290 * this guy had a RTO calculation
3291 * pending on it, cancel it
3292 */
3293 if (tp1->whoTo->rto_needed == 0) {
3294 tp1->whoTo->rto_needed = 1;
3295 }
3296 tp1->do_rtt = 0;
3297 }
3298 SCTP_STAT_INCR(sctps_pdrpmark);
3299 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3300 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3301 /*
3302 * mark it as if we were doing a FR, since
3303 * we will be getting gap ack reports behind
3304 * the info from the router.
3305 */
3306 tp1->rec.data.doing_fast_retransmit = 1;
3307 /*
3308 * mark the tsn with what sequences can
3309 * cause a new FR.
3310 */
3311 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3312 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3313 } else {
3314 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3315 }
3316
3317 /* restart the timer */
3318 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3319 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3320 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3321 stcb, tp1->whoTo);
3322
3323 /* fix counts and things */
3324 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3325 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3326 tp1->whoTo->flight_size,
3327 tp1->book_size,
3328 (uintptr_t) stcb,
3329 tp1->rec.data.TSN_seq);
3330 }
3331 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3332 sctp_flight_size_decrease(tp1);
3333 sctp_total_flight_decrease(stcb, tp1);
3334 }
3335 tp1->sent = SCTP_DATAGRAM_RESEND;
3336 } {
3337 /* audit code */
3338 unsigned int audit;
3339
3340 audit = 0;
3341 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3342 if (tp1->sent == SCTP_DATAGRAM_RESEND)
3343 audit++;
3344 }
3345 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3346 sctp_next) {
3347 if (tp1->sent == SCTP_DATAGRAM_RESEND)
3348 audit++;
3349 }
3350 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3351 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3352 audit, stcb->asoc.sent_queue_retran_cnt);
3353 #ifndef SCTP_AUDITING_ENABLED
3354 stcb->asoc.sent_queue_retran_cnt = audit;
3355 #endif
3356 }
3357 }
3358 }
3359 break;
3360 case SCTP_ASCONF:
3361 {
3362 struct sctp_tmit_chunk *asconf;
3363
3364 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3365 sctp_next) {
3366 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3367 break;
3368 }
3369 }
3370 if (asconf) {
3371 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3372 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3373 asconf->sent = SCTP_DATAGRAM_RESEND;
3374 asconf->snd_count--;
3375 }
3376 }
3377 break;
3378 case SCTP_INITIATION:
3379 /* resend the INIT */
3380 stcb->asoc.dropped_special_cnt++;
3381 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3382 /*
3383 * If we can get it in, in a few attempts we do
3384 * this, otherwise we let the timer fire.
3385 */
3386 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3387 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3388 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3389 }
3390 break;
3391 case SCTP_SELECTIVE_ACK:
3392 case SCTP_NR_SELECTIVE_ACK:
3393 /* resend the sack */
3394 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3395 break;
3396 case SCTP_HEARTBEAT_REQUEST:
3397 /* resend a demand HB */
3398 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3399 /*
3400 * Only retransmit if we KNOW we wont destroy the
3401 * tcb
3402 */
3403 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3404 }
3405 break;
3406 case SCTP_SHUTDOWN:
3407 sctp_send_shutdown(stcb, net);
3408 break;
3409 case SCTP_SHUTDOWN_ACK:
3410 sctp_send_shutdown_ack(stcb, net);
3411 break;
3412 case SCTP_COOKIE_ECHO:
3413 {
3414 struct sctp_tmit_chunk *cookie;
3415
3416 cookie = NULL;
3417 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3418 sctp_next) {
3419 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3420 break;
3421 }
3422 }
3423 if (cookie) {
3424 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3425 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3426 cookie->sent = SCTP_DATAGRAM_RESEND;
3427 sctp_stop_all_cookie_timers(stcb);
3428 }
3429 }
3430 break;
3431 case SCTP_COOKIE_ACK:
3432 sctp_send_cookie_ack(stcb);
3433 break;
3434 case SCTP_ASCONF_ACK:
3435 /* resend last asconf ack */
3436 sctp_send_asconf_ack(stcb);
3437 break;
3438 case SCTP_FORWARD_CUM_TSN:
3439 send_forward_tsn(stcb, &stcb->asoc);
3440 break;
3441 /* can't do anything with these */
3442 case SCTP_PACKET_DROPPED:
3443 case SCTP_INITIATION_ACK: /* this should not happen */
3444 case SCTP_HEARTBEAT_ACK:
3445 case SCTP_ABORT_ASSOCIATION:
3446 case SCTP_OPERATION_ERROR:
3447 case SCTP_SHUTDOWN_COMPLETE:
3448 case SCTP_ECN_ECHO:
3449 case SCTP_ECN_CWR:
3450 default:
3451 break;
3452 }
3453 return (0);
3454 }
3455
3456 void
3457 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3458 {
3459 int i;
3460 uint16_t temp;
3461
3462 /*
3463 * We set things to 0xffff since this is the last delivered sequence
3464 * and we will be sending in 0 after the reset.
3465 */
3466
3467 if (number_entries) {
3468 for (i = 0; i < number_entries; i++) {
3469 temp = ntohs(list[i]);
3470 if (temp >= stcb->asoc.streamincnt) {
3471 continue;
3472 }
3473 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3474 }
3475 } else {
3476 list = NULL;
3477 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3478 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3479 }
3480 }
3481 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3482 }
3483
3484 static void
3485 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3486 {
3487 int i;
3488
3489 if (number_entries == 0) {
3490 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3491 stcb->asoc.strmout[i].next_sequence_sent = 0;
3492 }
3493 } else if (number_entries) {
3494 for (i = 0; i < number_entries; i++) {
3495 uint16_t temp;
3496
3497 temp = ntohs(list[i]);
3498 if (temp >= stcb->asoc.streamoutcnt) {
3499 /* no such stream */
3500 continue;
3501 }
3502 stcb->asoc.strmout[temp].next_sequence_sent = 0;
3503 }
3504 }
3505 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3506 }
3507
3508
3509 struct sctp_stream_reset_out_request *
3510 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3511 {
3512 struct sctp_association *asoc;
3513 struct sctp_stream_reset_out_req *req;
3514 struct sctp_stream_reset_out_request *r;
3515 struct sctp_tmit_chunk *chk;
3516 int len, clen;
3517
3518 asoc = &stcb->asoc;
3519 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3520 asoc->stream_reset_outstanding = 0;
3521 return (NULL);
3522 }
3523 if (stcb->asoc.str_reset == NULL) {
3524 asoc->stream_reset_outstanding = 0;
3525 return (NULL);
3526 }
3527 chk = stcb->asoc.str_reset;
3528 if (chk->data == NULL) {
3529 return (NULL);
3530 }
3531 if (bchk) {
3532 /* he wants a copy of the chk pointer */
3533 *bchk = chk;
3534 }
3535 clen = chk->send_size;
3536 req = mtod(chk->data, struct sctp_stream_reset_out_req *);
3537 r = &req->sr_req;
3538 if (ntohl(r->request_seq) == seq) {
3539 /* found it */
3540 return (r);
3541 }
3542 len = SCTP_SIZE32(ntohs(r->ph.param_length));
3543 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3544 /* move to the next one, there can only be a max of two */
3545 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3546 if (ntohl(r->request_seq) == seq) {
3547 return (r);
3548 }
3549 }
3550 /* that seq is not here */
3551 return (NULL);
3552 }
3553
3554 static void
3555 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3556 {
3557 struct sctp_association *asoc;
3558 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3559
3560 if (stcb->asoc.str_reset == NULL) {
3561 return;
3562 }
3563 asoc = &stcb->asoc;
3564
3565 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3566 TAILQ_REMOVE(&asoc->control_send_queue,
3567 chk,
3568 sctp_next);
3569 if (chk->data) {
3570 sctp_m_freem(chk->data);
3571 chk->data = NULL;
3572 }
3573 asoc->ctrl_queue_cnt--;
3574 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3575 /* sa_ignore NO_NULL_CHK */
3576 stcb->asoc.str_reset = NULL;
3577 }
3578
3579
3580 static int
3581 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3582 uint32_t seq, uint32_t action,
3583 struct sctp_stream_reset_response *respin)
3584 {
3585 uint16_t type;
3586 int lparm_len;
3587 struct sctp_association *asoc = &stcb->asoc;
3588 struct sctp_tmit_chunk *chk;
3589 struct sctp_stream_reset_out_request *srparam;
3590 int number_entries;
3591
3592 if (asoc->stream_reset_outstanding == 0) {
3593 /* duplicate */
3594 return (0);
3595 }
3596 if (seq == stcb->asoc.str_reset_seq_out) {
3597 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3598 if (srparam) {
3599 stcb->asoc.str_reset_seq_out++;
3600 type = ntohs(srparam->ph.param_type);
3601 lparm_len = ntohs(srparam->ph.param_length);
3602 if (type == SCTP_STR_RESET_OUT_REQUEST) {
3603 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3604 asoc->stream_reset_out_is_outstanding = 0;
3605 if (asoc->stream_reset_outstanding)
3606 asoc->stream_reset_outstanding--;
3607 if (action == SCTP_STREAM_RESET_PERFORMED) {
3608 /* do it */
3609 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3610 } else {
3611 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3612 }
3613 } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3614 /* Answered my request */
3615 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3616 if (asoc->stream_reset_outstanding)
3617 asoc->stream_reset_outstanding--;
3618 if (action != SCTP_STREAM_RESET_PERFORMED) {
3619 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3620 }
3621 } else if (type == SCTP_STR_RESET_ADD_STREAMS) {
3622 /* Ok we now may have more streams */
3623 if (asoc->stream_reset_outstanding)
3624 asoc->stream_reset_outstanding--;
3625 if (action == SCTP_STREAM_RESET_PERFORMED) {
3626 /* Put the new streams into effect */
3627 stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize;
3628 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb,
3629 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3630 } else {
3631 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb,
3632 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED);
3633 }
3634 } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3635 /**
3636 * a) Adopt the new in tsn.
3637 * b) reset the map
3638 * c) Adopt the new out-tsn
3639 */
3640 struct sctp_stream_reset_response_tsn *resp;
3641 struct sctp_forward_tsn_chunk fwdtsn;
3642 int abort_flag = 0;
3643
3644 if (respin == NULL) {
3645 /* huh ? */
3646 return (0);
3647 }
3648 if (action == SCTP_STREAM_RESET_PERFORMED) {
3649 resp = (struct sctp_stream_reset_response_tsn *)respin;
3650 asoc->stream_reset_outstanding--;
3651 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3652 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3653 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3654 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3655 if (abort_flag) {
3656 return (1);
3657 }
3658 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3659 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3660 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3661 }
3662 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3663 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3664 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3665
3666 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3667 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3668
3669 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3670 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3671
3672 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3673 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3674
3675 }
3676 }
3677 /* get rid of the request and get the request flags */
3678 if (asoc->stream_reset_outstanding == 0) {
3679 sctp_clean_up_stream_reset(stcb);
3680 }
3681 }
3682 }
3683 return (0);
3684 }
3685
3686 static void
3687 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3688 struct sctp_tmit_chunk *chk,
3689 struct sctp_stream_reset_in_request *req, int trunc)
3690 {
3691 uint32_t seq;
3692 int len, i;
3693 int number_entries;
3694 uint16_t temp;
3695
3696 /*
3697 * peer wants me to send a str-reset to him for my outgoing seq's if
3698 * seq_in is right.
3699 */
3700 struct sctp_association *asoc = &stcb->asoc;
3701
3702 seq = ntohl(req->request_seq);
3703 if (asoc->str_reset_seq_in == seq) {
3704 if (trunc) {
3705 /* Can't do it, since they exceeded our buffer size */
3706 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3707 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3708 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3709 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3710 len = ntohs(req->ph.param_length);
3711 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3712 for (i = 0; i < number_entries; i++) {
3713 temp = ntohs(req->list_of_streams[i]);
3714 req->list_of_streams[i] = temp;
3715 }
3716 /* move the reset action back one */
3717 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3718 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3719 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3720 asoc->str_reset_seq_out,
3721 seq, (asoc->sending_seq - 1));
3722 asoc->stream_reset_out_is_outstanding = 1;
3723 asoc->str_reset = chk;
3724 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3725 stcb->asoc.stream_reset_outstanding++;
3726 } else {
3727 /* Can't do it, since we have sent one out */
3728 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3729 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER;
3730 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3731 }
3732 asoc->str_reset_seq_in++;
3733 } else if (asoc->str_reset_seq_in - 1 == seq) {
3734 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3735 } else if (asoc->str_reset_seq_in - 2 == seq) {
3736 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3737 } else {
3738 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3739 }
3740 }
3741
3742 static int
3743 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3744 struct sctp_tmit_chunk *chk,
3745 struct sctp_stream_reset_tsn_request *req)
3746 {
3747 /* reset all in and out and update the tsn */
3748 /*
3749 * A) reset my str-seq's on in and out. B) Select a receive next,
3750 * and set cum-ack to it. Also process this selected number as a
3751 * fwd-tsn as well. C) set in the response my next sending seq.
3752 */
3753 struct sctp_forward_tsn_chunk fwdtsn;
3754 struct sctp_association *asoc = &stcb->asoc;
3755 int abort_flag = 0;
3756 uint32_t seq;
3757
3758 seq = ntohl(req->request_seq);
3759 if (asoc->str_reset_seq_in == seq) {
3760 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3761 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3762 fwdtsn.ch.chunk_flags = 0;
3763 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3764 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3765 if (abort_flag) {
3766 return (1);
3767 }
3768 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3769 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3770 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3771 }
3772 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3773 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1;
3774 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3775 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3776 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3777 atomic_add_int(&stcb->asoc.sending_seq, 1);
3778 /* save off historical data for retrans */
3779 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0];
3780 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq;
3781 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0];
3782 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn;
3783
3784 sctp_add_stream_reset_result_tsn(chk,
3785 ntohl(req->request_seq),
3786 SCTP_STREAM_RESET_PERFORMED,
3787 stcb->asoc.sending_seq,
3788 stcb->asoc.mapping_array_base_tsn);
3789 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3790 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3791 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3792 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3793
3794 asoc->str_reset_seq_in++;
3795 } else if (asoc->str_reset_seq_in - 1 == seq) {
3796 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3797 stcb->asoc.last_sending_seq[0],
3798 stcb->asoc.last_base_tsnsent[0]
3799 );
3800 } else if (asoc->str_reset_seq_in - 2 == seq) {
3801 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3802 stcb->asoc.last_sending_seq[1],
3803 stcb->asoc.last_base_tsnsent[1]
3804 );
3805 } else {
3806 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3807 }
3808 return (0);
3809 }
3810
3811 static void
3812 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3813 struct sctp_tmit_chunk *chk,
3814 struct sctp_stream_reset_out_request *req, int trunc)
3815 {
3816 uint32_t seq, tsn;
3817 int number_entries, len;
3818 struct sctp_association *asoc = &stcb->asoc;
3819
3820 seq = ntohl(req->request_seq);
3821
3822 /* now if its not a duplicate we process it */
3823 if (asoc->str_reset_seq_in == seq) {
3824 len = ntohs(req->ph.param_length);
3825 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3826 /*
3827 * the sender is resetting, handle the list issue.. we must
3828 * a) verify if we can do the reset, if so no problem b) If
3829 * we can't do the reset we must copy the request. c) queue
3830 * it, and setup the data in processor to trigger it off
3831 * when needed and dequeue all the queued data.
3832 */
3833 tsn = ntohl(req->send_reset_at_tsn);
3834
3835 /* move the reset action back one */
3836 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3837 if (trunc) {
3838 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3839 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3840 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3841 /* we can do it now */
3842 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3843 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3844 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3845 } else {
3846 /*
3847 * we must queue it up and thus wait for the TSN's
3848 * to arrive that are at or before tsn
3849 */
3850 struct sctp_stream_reset_list *liste;
3851 int siz;
3852
3853 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3854 SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3855 siz, SCTP_M_STRESET);
3856 if (liste == NULL) {
3857 /* gak out of memory */
3858 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3859 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3860 return;
3861 }
3862 liste->tsn = tsn;
3863 liste->number_entries = number_entries;
3864 memcpy(&liste->req, req,
3865 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
3866 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3867 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3868 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3869 }
3870 asoc->str_reset_seq_in++;
3871 } else if ((asoc->str_reset_seq_in - 1) == seq) {
3872 /*
3873 * one seq back, just echo back last action since my
3874 * response was lost.
3875 */
3876 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3877 } else if ((asoc->str_reset_seq_in - 2) == seq) {
3878 /*
3879 * two seq back, just echo back last action since my
3880 * response was lost.
3881 */
3882 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3883 } else {
3884 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3885 }
3886 }
3887
3888 static void
3889 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3890 struct sctp_stream_reset_add_strm *str_add)
3891 {
3892 /*
3893 * Peer is requesting to add more streams. If its within our
3894 * max-streams we will allow it.
3895 */
3896 uint16_t num_stream, i;
3897 uint32_t seq;
3898 struct sctp_association *asoc = &stcb->asoc;
3899 struct sctp_queued_to_read *ctl, *nctl;
3900
3901 /* Get the number. */
3902 seq = ntohl(str_add->request_seq);
3903 num_stream = ntohs(str_add->number_of_streams);
3904 /* Now what would be the new total? */
3905 if (asoc->str_reset_seq_in == seq) {
3906 num_stream += stcb->asoc.streamincnt;
3907 if (num_stream > stcb->asoc.max_inbound_streams) {
3908 /* We must reject it they ask for to many */
3909 denied:
3910 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3911 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3912 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3913 } else {
3914 /* Ok, we can do that :-) */
3915 struct sctp_stream_in *oldstrm;
3916
3917 /* save off the old */
3918 oldstrm = stcb->asoc.strmin;
3919 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3920 (num_stream * sizeof(struct sctp_stream_in)),
3921 SCTP_M_STRMI);
3922 if (stcb->asoc.strmin == NULL) {
3923 stcb->asoc.strmin = oldstrm;
3924 goto denied;
3925 }
3926 /* copy off the old data */
3927 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3928 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3929 stcb->asoc.strmin[i].stream_no = i;
3930 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3931 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3932 /* now anything on those queues? */
3933 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3934 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3935 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3936 }
3937 }
3938 /* Init the new streams */
3939 for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3940 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3941 stcb->asoc.strmin[i].stream_no = i;
3942 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3943 stcb->asoc.strmin[i].delivery_started = 0;
3944 }
3945 SCTP_FREE(oldstrm, SCTP_M_STRMI);
3946 /* update the size */
3947 stcb->asoc.streamincnt = num_stream;
3948 /* Send the ack */
3949 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3950 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3951 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3952 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb,
3953 (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED);
3954 }
3955 } else if ((asoc->str_reset_seq_in - 1) == seq) {
3956 /*
3957 * one seq back, just echo back last action since my
3958 * response was lost.
3959 */
3960 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3961 } else if ((asoc->str_reset_seq_in - 2) == seq) {
3962 /*
3963 * two seq back, just echo back last action since my
3964 * response was lost.
3965 */
3966 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3967 } else {
3968 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3969
3970 }
3971 }
3972
3973 #ifdef __GNUC__
3974 __attribute__((noinline))
3975 #endif
3976 static int
3977 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3978 struct sctp_stream_reset_out_req *sr_req)
3979 {
3980 int chk_length, param_len, ptype;
3981 struct sctp_paramhdr pstore;
3982 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3983
3984 uint32_t seq;
3985 int num_req = 0;
3986 int trunc = 0;
3987 struct sctp_tmit_chunk *chk;
3988 struct sctp_chunkhdr *ch;
3989 struct sctp_paramhdr *ph;
3990 int ret_code = 0;
3991 int num_param = 0;
3992
3993 /* now it may be a reset or a reset-response */
3994 chk_length = ntohs(sr_req->ch.chunk_length);
3995
3996 /* setup for adding the response */
3997 sctp_alloc_a_chunk(stcb, chk);
3998 if (chk == NULL) {
3999 return (ret_code);
4000 }
4001 chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4002 chk->rec.chunk_id.can_take_data = 0;
4003 chk->asoc = &stcb->asoc;
4004 chk->no_fr_allowed = 0;
4005 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4006 chk->book_size_scale = 0;
4007 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
4008 if (chk->data == NULL) {
4009 strres_nochunk:
4010 if (chk->data) {
4011 sctp_m_freem(chk->data);
4012 chk->data = NULL;
4013 }
4014 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4015 return (ret_code);
4016 }
4017 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4018
4019 /* setup chunk parameters */
4020 chk->sent = SCTP_DATAGRAM_UNSENT;
4021 chk->snd_count = 0;
4022 chk->whoTo = NULL;
4023
4024 ch = mtod(chk->data, struct sctp_chunkhdr *);
4025 ch->chunk_type = SCTP_STREAM_RESET;
4026 ch->chunk_flags = 0;
4027 ch->chunk_length = htons(chk->send_size);
4028 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4029 offset += sizeof(struct sctp_chunkhdr);
4030 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
4031 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4032 if (ph == NULL)
4033 break;
4034 param_len = ntohs(ph->param_length);
4035 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
4036 /* bad param */
4037 break;
4038 }
4039 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
4040 (uint8_t *) & cstore);
4041 ptype = ntohs(ph->param_type);
4042 num_param++;
4043 if (param_len > (int)sizeof(cstore)) {
4044 trunc = 1;
4045 } else {
4046 trunc = 0;
4047 }
4048
4049 if (num_param > SCTP_MAX_RESET_PARAMS) {
4050 /* hit the max of parameters already sorry.. */
4051 break;
4052 }
4053 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4054 struct sctp_stream_reset_out_request *req_out;
4055
4056 req_out = (struct sctp_stream_reset_out_request *)ph;
4057 num_req++;
4058 if (stcb->asoc.stream_reset_outstanding) {
4059 seq = ntohl(req_out->response_seq);
4060 if (seq == stcb->asoc.str_reset_seq_out) {
4061 /* implicit ack */
4062 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL);
4063 }
4064 }
4065 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4066 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) {
4067 struct sctp_stream_reset_add_strm *str_add;
4068
4069 str_add = (struct sctp_stream_reset_add_strm *)ph;
4070 num_req++;
4071 sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4072 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4073 struct sctp_stream_reset_in_request *req_in;
4074
4075 num_req++;
4076
4077 req_in = (struct sctp_stream_reset_in_request *)ph;
4078
4079 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4080 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4081 struct sctp_stream_reset_tsn_request *req_tsn;
4082
4083 num_req++;
4084 req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4085
4086 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4087 ret_code = 1;
4088 goto strres_nochunk;
4089 }
4090 /* no more */
4091 break;
4092 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4093 struct sctp_stream_reset_response *resp;
4094 uint32_t result;
4095
4096 resp = (struct sctp_stream_reset_response *)ph;
4097 seq = ntohl(resp->response_seq);
4098 result = ntohl(resp->result);
4099 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4100 ret_code = 1;
4101 goto strres_nochunk;
4102 }
4103 } else {
4104 break;
4105 }
4106 offset += SCTP_SIZE32(param_len);
4107 chk_length -= SCTP_SIZE32(param_len);
4108 }
4109 if (num_req == 0) {
4110 /* we have no response free the stuff */
4111 goto strres_nochunk;
4112 }
4113 /* ok we have a chunk to link in */
4114 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4115 chk,
4116 sctp_next);
4117 stcb->asoc.ctrl_queue_cnt++;
4118 return (ret_code);
4119 }
4120
4121 /*
4122 * Handle a router or endpoints report of a packet loss, there are two ways
4123 * to handle this, either we get the whole packet and must disect it
4124 * ourselves (possibly with truncation and or corruption) or it is a summary
4125 * from a middle box that did the disectting for us.
4126 */
4127 static void
4128 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4129 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4130 {
4131 uint32_t bottle_bw, on_queue;
4132 uint16_t trunc_len;
4133 unsigned int chlen;
4134 unsigned int at;
4135 struct sctp_chunk_desc desc;
4136 struct sctp_chunkhdr *ch;
4137
4138 chlen = ntohs(cp->ch.chunk_length);
4139 chlen -= sizeof(struct sctp_pktdrop_chunk);
4140 /* XXX possible chlen underflow */
4141 if (chlen == 0) {
4142 ch = NULL;
4143 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4144 SCTP_STAT_INCR(sctps_pdrpbwrpt);
4145 } else {
4146 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4147 chlen -= sizeof(struct sctphdr);
4148 /* XXX possible chlen underflow */
4149 memset(&desc, 0, sizeof(desc));
4150 }
4151 trunc_len = (uint16_t) ntohs(cp->trunc_len);
4152 if (trunc_len > limit) {
4153 trunc_len = limit;
4154 }
4155 /* now the chunks themselves */
4156 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4157 desc.chunk_type = ch->chunk_type;
4158 /* get amount we need to move */
4159 at = ntohs(ch->chunk_length);
4160 if (at < sizeof(struct sctp_chunkhdr)) {
4161 /* corrupt chunk, maybe at the end? */
4162 SCTP_STAT_INCR(sctps_pdrpcrupt);
4163 break;
4164 }
4165 if (trunc_len == 0) {
4166 /* we are supposed to have all of it */
4167 if (at > chlen) {
4168 /* corrupt skip it */
4169 SCTP_STAT_INCR(sctps_pdrpcrupt);
4170 break;
4171 }
4172 } else {
4173 /* is there enough of it left ? */
4174 if (desc.chunk_type == SCTP_DATA) {
4175 if (chlen < (sizeof(struct sctp_data_chunk) +
4176 sizeof(desc.data_bytes))) {
4177 break;
4178 }
4179 } else {
4180 if (chlen < sizeof(struct sctp_chunkhdr)) {
4181 break;
4182 }
4183 }
4184 }
4185 if (desc.chunk_type == SCTP_DATA) {
4186 /* can we get out the tsn? */
4187 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4188 SCTP_STAT_INCR(sctps_pdrpmbda);
4189
4190 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4191 /* yep */
4192 struct sctp_data_chunk *dcp;
4193 uint8_t *ddp;
4194 unsigned int iii;
4195
4196 dcp = (struct sctp_data_chunk *)ch;
4197 ddp = (uint8_t *) (dcp + 1);
4198 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4199 desc.data_bytes[iii] = ddp[iii];
4200 }
4201 desc.tsn_ifany = dcp->dp.tsn;
4202 } else {
4203 /* nope we are done. */
4204 SCTP_STAT_INCR(sctps_pdrpnedat);
4205 break;
4206 }
4207 } else {
4208 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4209 SCTP_STAT_INCR(sctps_pdrpmbct);
4210 }
4211
4212 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4213 SCTP_STAT_INCR(sctps_pdrppdbrk);
4214 break;
4215 }
4216 if (SCTP_SIZE32(at) > chlen) {
4217 break;
4218 }
4219 chlen -= SCTP_SIZE32(at);
4220 if (chlen < sizeof(struct sctp_chunkhdr)) {
4221 /* done, none left */
4222 break;
4223 }
4224 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4225 }
4226 /* Now update any rwnd --- possibly */
4227 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4228 /* From a peer, we get a rwnd report */
4229 uint32_t a_rwnd;
4230
4231 SCTP_STAT_INCR(sctps_pdrpfehos);
4232
4233 bottle_bw = ntohl(cp->bottle_bw);
4234 on_queue = ntohl(cp->current_onq);
4235 if (bottle_bw && on_queue) {
4236 /* a rwnd report is in here */
4237 if (bottle_bw > on_queue)
4238 a_rwnd = bottle_bw - on_queue;
4239 else
4240 a_rwnd = 0;
4241
4242 if (a_rwnd == 0)
4243 stcb->asoc.peers_rwnd = 0;
4244 else {
4245 if (a_rwnd > stcb->asoc.total_flight) {
4246 stcb->asoc.peers_rwnd =
4247 a_rwnd - stcb->asoc.total_flight;
4248 } else {
4249 stcb->asoc.peers_rwnd = 0;
4250 }
4251 if (stcb->asoc.peers_rwnd <
4252 stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4253 /* SWS sender side engages */
4254 stcb->asoc.peers_rwnd = 0;
4255 }
4256 }
4257 }
4258 } else {
4259 SCTP_STAT_INCR(sctps_pdrpfmbox);
4260 }
4261
4262 /* now middle boxes in sat networks get a cwnd bump */
4263 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4264 (stcb->asoc.sat_t3_loss_recovery == 0) &&
4265 (stcb->asoc.sat_network)) {
4266 /*
4267 * This is debateable but for sat networks it makes sense
4268 * Note if a T3 timer has went off, we will prohibit any
4269 * changes to cwnd until we exit the t3 loss recovery.
4270 */
4271 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4272 net, cp, &bottle_bw, &on_queue);
4273 }
4274 }
4275
4276 /*
4277 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4278 * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4279 * offset: offset into the mbuf chain to first chunkhdr - length: is the
4280 * length of the complete packet outputs: - length: modified to remaining
4281 * length after control processing - netp: modified to new sctp_nets after
4282 * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4283 * bad packet,...) otherwise return the tcb for this packet
4284 */
4285 #ifdef __GNUC__
4286 __attribute__((noinline))
4287 #endif
4288 static struct sctp_tcb *
4289 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4290 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4291 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4292 uint32_t vrf_id, uint16_t port)
4293 {
4294 struct sctp_association *asoc;
4295 uint32_t vtag_in;
4296 int num_chunks = 0; /* number of control chunks processed */
4297 uint32_t chk_length;
4298 int ret;
4299 int abort_no_unlock = 0;
4300 int ecne_seen = 0;
4301
4302 /*
4303 * How big should this be, and should it be alloc'd? Lets try the
4304 * d-mtu-ceiling for now (2k) and that should hopefully work ...
4305 * until we get into jumbo grams and such..
4306 */
4307 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4308 struct sctp_tcb *locked_tcb = stcb;
4309 int got_auth = 0;
4310 uint32_t auth_offset = 0, auth_len = 0;
4311 int auth_skipped = 0;
4312 int asconf_cnt = 0;
4313
4314 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4315 struct socket *so;
4316
4317 #endif
4318
4319 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4320 iphlen, *offset, length, stcb);
4321
4322 /* validate chunk header length... */
4323 if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4324 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4325 ntohs(ch->chunk_length));
4326 if (locked_tcb) {
4327 SCTP_TCB_UNLOCK(locked_tcb);
4328 }
4329 return (NULL);
4330 }
4331 /*
4332 * validate the verification tag
4333 */
4334 vtag_in = ntohl(sh->v_tag);
4335
4336 if (locked_tcb) {
4337 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4338 }
4339 if (ch->chunk_type == SCTP_INITIATION) {
4340 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4341 ntohs(ch->chunk_length), vtag_in);
4342 if (vtag_in != 0) {
4343 /* protocol error- silently discard... */
4344 SCTP_STAT_INCR(sctps_badvtag);
4345 if (locked_tcb) {
4346 SCTP_TCB_UNLOCK(locked_tcb);
4347 }
4348 return (NULL);
4349 }
4350 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4351 /*
4352 * If there is no stcb, skip the AUTH chunk and process
4353 * later after a stcb is found (to validate the lookup was
4354 * valid.
4355 */
4356 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4357 (stcb == NULL) &&
4358 !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4359 /* save this chunk for later processing */
4360 auth_skipped = 1;
4361 auth_offset = *offset;
4362 auth_len = ntohs(ch->chunk_length);
4363
4364 /* (temporarily) move past this chunk */
4365 *offset += SCTP_SIZE32(auth_len);
4366 if (*offset >= length) {
4367 /* no more data left in the mbuf chain */
4368 *offset = length;
4369 if (locked_tcb) {
4370 SCTP_TCB_UNLOCK(locked_tcb);
4371 }
4372 return (NULL);
4373 }
4374 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4375 sizeof(struct sctp_chunkhdr), chunk_buf);
4376 }
4377 if (ch == NULL) {
4378 /* Help */
4379 *offset = length;
4380 if (locked_tcb) {
4381 SCTP_TCB_UNLOCK(locked_tcb);
4382 }
4383 return (NULL);
4384 }
4385 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4386 goto process_control_chunks;
4387 }
4388 /*
4389 * first check if it's an ASCONF with an unknown src addr we
4390 * need to look inside to find the association
4391 */
4392 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4393 struct sctp_chunkhdr *asconf_ch = ch;
4394 uint32_t asconf_offset = 0, asconf_len = 0;
4395
4396 /* inp's refcount may be reduced */
4397 SCTP_INP_INCR_REF(inp);
4398
4399 asconf_offset = *offset;
4400 do {
4401 asconf_len = ntohs(asconf_ch->chunk_length);
4402 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4403 break;
4404 stcb = sctp_findassociation_ep_asconf(m, iphlen,
4405 *offset, sh, &inp, netp, vrf_id);
4406 if (stcb != NULL)
4407 break;
4408 asconf_offset += SCTP_SIZE32(asconf_len);
4409 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4410 sizeof(struct sctp_chunkhdr), chunk_buf);
4411 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4412 if (stcb == NULL) {
4413 /*
4414 * reduce inp's refcount if not reduced in
4415 * sctp_findassociation_ep_asconf().
4416 */
4417 SCTP_INP_DECR_REF(inp);
4418 } else {
4419 locked_tcb = stcb;
4420 }
4421
4422 /* now go back and verify any auth chunk to be sure */
4423 if (auth_skipped && (stcb != NULL)) {
4424 struct sctp_auth_chunk *auth;
4425
4426 auth = (struct sctp_auth_chunk *)
4427 sctp_m_getptr(m, auth_offset,
4428 auth_len, chunk_buf);
4429 got_auth = 1;
4430 auth_skipped = 0;
4431 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4432 auth_offset)) {
4433 /* auth HMAC failed so dump it */
4434 *offset = length;
4435 if (locked_tcb) {
4436 SCTP_TCB_UNLOCK(locked_tcb);
4437 }
4438 return (NULL);
4439 } else {
4440 /* remaining chunks are HMAC checked */
4441 stcb->asoc.authenticated = 1;
4442 }
4443 }
4444 }
4445 if (stcb == NULL) {
4446 /* no association, so it's out of the blue... */
4447 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL,
4448 vrf_id, port);
4449 *offset = length;
4450 if (locked_tcb) {
4451 SCTP_TCB_UNLOCK(locked_tcb);
4452 }
4453 return (NULL);
4454 }
4455 asoc = &stcb->asoc;
4456 /* ABORT and SHUTDOWN can use either v_tag... */
4457 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4458 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4459 (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4460 if ((vtag_in == asoc->my_vtag) ||
4461 ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
4462 (vtag_in == asoc->peer_vtag))) {
4463 /* this is valid */
4464 } else {
4465 /* drop this packet... */
4466 SCTP_STAT_INCR(sctps_badvtag);
4467 if (locked_tcb) {
4468 SCTP_TCB_UNLOCK(locked_tcb);
4469 }
4470 return (NULL);
4471 }
4472 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4473 if (vtag_in != asoc->my_vtag) {
4474 /*
4475 * this could be a stale SHUTDOWN-ACK or the
4476 * peer never got the SHUTDOWN-COMPLETE and
4477 * is still hung; we have started a new asoc
4478 * but it won't complete until the shutdown
4479 * is completed
4480 */
4481 if (locked_tcb) {
4482 SCTP_TCB_UNLOCK(locked_tcb);
4483 }
4484 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
4485 NULL, vrf_id, port);
4486 return (NULL);
4487 }
4488 } else {
4489 /* for all other chunks, vtag must match */
4490 if (vtag_in != asoc->my_vtag) {
4491 /* invalid vtag... */
4492 SCTPDBG(SCTP_DEBUG_INPUT3,
4493 "invalid vtag: %xh, expect %xh\n",
4494 vtag_in, asoc->my_vtag);
4495 SCTP_STAT_INCR(sctps_badvtag);
4496 if (locked_tcb) {
4497 SCTP_TCB_UNLOCK(locked_tcb);
4498 }
4499 *offset = length;
4500 return (NULL);
4501 }
4502 }
4503 } /* end if !SCTP_COOKIE_ECHO */
4504 /*
4505 * process all control chunks...
4506 */
4507 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4508 /* EY */
4509 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4510 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4511 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4512 /* implied cookie-ack.. we must have lost the ack */
4513 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4514 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4515 stcb->asoc.overall_error_count,
4516 0,
4517 SCTP_FROM_SCTP_INPUT,
4518 __LINE__);
4519 }
4520 stcb->asoc.overall_error_count = 0;
4521 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4522 *netp);
4523 }
4524 process_control_chunks:
4525 while (IS_SCTP_CONTROL(ch)) {
4526 /* validate chunk length */
4527 chk_length = ntohs(ch->chunk_length);
4528 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4529 ch->chunk_type, chk_length);
4530 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4531 if (chk_length < sizeof(*ch) ||
4532 (*offset + (int)chk_length) > length) {
4533 *offset = length;
4534 if (locked_tcb) {
4535 SCTP_TCB_UNLOCK(locked_tcb);
4536 }
4537 return (NULL);
4538 }
4539 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4540 /*
4541 * INIT-ACK only gets the init ack "header" portion only
4542 * because we don't have to process the peer's COOKIE. All
4543 * others get a complete chunk.
4544 */
4545 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4546 (ch->chunk_type == SCTP_INITIATION)) {
4547 /* get an init-ack chunk */
4548 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4549 sizeof(struct sctp_init_ack_chunk), chunk_buf);
4550 if (ch == NULL) {
4551 *offset = length;
4552 if (locked_tcb) {
4553 SCTP_TCB_UNLOCK(locked_tcb);
4554 }
4555 return (NULL);
4556 }
4557 } else {
4558 /* For cookies and all other chunks. */
4559 if (chk_length > sizeof(chunk_buf)) {
4560 /*
4561 * use just the size of the chunk buffer so
4562 * the front part of our chunks fit in
4563 * contiguous space up to the chunk buffer
4564 * size (508 bytes). For chunks that need to
4565 * get more than that they must use the
4566 * sctp_m_getptr() function or other means
4567 * (e.g. know how to parse mbuf chains).
4568 * Cookies do this already.
4569 */
4570 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4571 (sizeof(chunk_buf) - 4),
4572 chunk_buf);
4573 if (ch == NULL) {
4574 *offset = length;
4575 if (locked_tcb) {
4576 SCTP_TCB_UNLOCK(locked_tcb);
4577 }
4578 return (NULL);
4579 }
4580 } else {
4581 /* We can fit it all */
4582 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4583 chk_length, chunk_buf);
4584 if (ch == NULL) {
4585 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4586 *offset = length;
4587 if (locked_tcb) {
4588 SCTP_TCB_UNLOCK(locked_tcb);
4589 }
4590 return (NULL);
4591 }
4592 }
4593 }
4594 num_chunks++;
4595 /* Save off the last place we got a control from */
4596 if (stcb != NULL) {
4597 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4598 /*
4599 * allow last_control to be NULL if
4600 * ASCONF... ASCONF processing will find the
4601 * right net later
4602 */
4603 if ((netp != NULL) && (*netp != NULL))
4604 stcb->asoc.last_control_chunk_from = *netp;
4605 }
4606 }
4607 #ifdef SCTP_AUDITING_ENABLED
4608 sctp_audit_log(0xB0, ch->chunk_type);
4609 #endif
4610
4611 /* check to see if this chunk required auth, but isn't */
4612 if ((stcb != NULL) &&
4613 !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4614 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4615 !stcb->asoc.authenticated) {
4616 /* "silently" ignore */
4617 SCTP_STAT_INCR(sctps_recvauthmissing);
4618 goto next_chunk;
4619 }
4620 switch (ch->chunk_type) {
4621 case SCTP_INITIATION:
4622 /* must be first and only chunk */
4623 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4624 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4625 /* We are not interested anymore? */
4626 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4627 /*
4628 * collision case where we are
4629 * sending to them too
4630 */
4631 ;
4632 } else {
4633 if (locked_tcb) {
4634 SCTP_TCB_UNLOCK(locked_tcb);
4635 }
4636 *offset = length;
4637 return (NULL);
4638 }
4639 }
4640 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) ||
4641 (num_chunks > 1) ||
4642 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4643 *offset = length;
4644 if (locked_tcb) {
4645 SCTP_TCB_UNLOCK(locked_tcb);
4646 }
4647 return (NULL);
4648 }
4649 if ((stcb != NULL) &&
4650 (SCTP_GET_STATE(&stcb->asoc) ==
4651 SCTP_STATE_SHUTDOWN_ACK_SENT)) {
4652 sctp_send_shutdown_ack(stcb, NULL);
4653 *offset = length;
4654 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4655 if (locked_tcb) {
4656 SCTP_TCB_UNLOCK(locked_tcb);
4657 }
4658 return (NULL);
4659 }
4660 if (netp) {
4661 sctp_handle_init(m, iphlen, *offset, sh,
4662 (struct sctp_init_chunk *)ch, inp,
4663 stcb, *netp, &abort_no_unlock, vrf_id, port);
4664 }
4665 if (abort_no_unlock)
4666 return (NULL);
4667
4668 *offset = length;
4669 if (locked_tcb) {
4670 SCTP_TCB_UNLOCK(locked_tcb);
4671 }
4672 return (NULL);
4673 break;
4674 case SCTP_PAD_CHUNK:
4675 break;
4676 case SCTP_INITIATION_ACK:
4677 /* must be first and only chunk */
4678 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4679 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4680 /* We are not interested anymore */
4681 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4682 ;
4683 } else {
4684 if (locked_tcb != stcb) {
4685 /* Very unlikely */
4686 SCTP_TCB_UNLOCK(locked_tcb);
4687 }
4688 *offset = length;
4689 if (stcb) {
4690 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4691 so = SCTP_INP_SO(inp);
4692 atomic_add_int(&stcb->asoc.refcnt, 1);
4693 SCTP_TCB_UNLOCK(stcb);
4694 SCTP_SOCKET_LOCK(so, 1);
4695 SCTP_TCB_LOCK(stcb);
4696 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4697 #endif
4698 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4699 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4700 SCTP_SOCKET_UNLOCK(so, 1);
4701 #endif
4702 }
4703 return (NULL);
4704 }
4705 }
4706 if ((num_chunks > 1) ||
4707 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4708 *offset = length;
4709 if (locked_tcb) {
4710 SCTP_TCB_UNLOCK(locked_tcb);
4711 }
4712 return (NULL);
4713 }
4714 if ((netp) && (*netp)) {
4715 ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
4716 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id);
4717 } else {
4718 ret = -1;
4719 }
4720 /*
4721 * Special case, I must call the output routine to
4722 * get the cookie echoed
4723 */
4724 if (abort_no_unlock)
4725 return (NULL);
4726
4727 if ((stcb) && ret == 0)
4728 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4729 *offset = length;
4730 if (locked_tcb) {
4731 SCTP_TCB_UNLOCK(locked_tcb);
4732 }
4733 return (NULL);
4734 break;
4735 case SCTP_SELECTIVE_ACK:
4736 {
4737 struct sctp_sack_chunk *sack;
4738 int abort_now = 0;
4739 uint32_t a_rwnd, cum_ack;
4740 uint16_t num_seg, num_dup;
4741 uint8_t flags;
4742 int offset_seg, offset_dup;
4743
4744 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4745 SCTP_STAT_INCR(sctps_recvsacks);
4746 if (stcb == NULL) {
4747 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4748 break;
4749 }
4750 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4751 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4752 break;
4753 }
4754 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4755 /*-
4756 * If we have sent a shutdown-ack, we will pay no
4757 * attention to a sack sent in to us since
4758 * we don't care anymore.
4759 */
4760 break;
4761 }
4762 sack = (struct sctp_sack_chunk *)ch;
4763 flags = ch->chunk_flags;
4764 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4765 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4766 num_dup = ntohs(sack->sack.num_dup_tsns);
4767 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4768 if (sizeof(struct sctp_sack_chunk) +
4769 num_seg * sizeof(struct sctp_gap_ack_block) +
4770 num_dup * sizeof(uint32_t) != chk_length) {
4771 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4772 break;
4773 }
4774 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4775 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4776 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4777 cum_ack, num_seg, a_rwnd);
4778 stcb->asoc.seen_a_sack_this_pkt = 1;
4779 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4780 (num_seg == 0) &&
4781 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4782 (stcb->asoc.saw_sack_with_frags == 0) &&
4783 (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4784 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4785 ) {
4786 /*
4787 * We have a SIMPLE sack having no
4788 * prior segments and data on sent
4789 * queue to be acked.. Use the
4790 * faster path sack processing. We
4791 * also allow window update sacks
4792 * with no missing segments to go
4793 * this way too.
4794 */
4795 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4796 } else {
4797 if (netp && *netp)
4798 sctp_handle_sack(m, offset_seg, offset_dup,
4799 stcb, *netp,
4800 num_seg, 0, num_dup, &abort_now, flags,
4801 cum_ack, a_rwnd, ecne_seen);
4802 }
4803 if (abort_now) {
4804 /* ABORT signal from sack processing */
4805 *offset = length;
4806 return (NULL);
4807 }
4808 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4809 TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4810 (stcb->asoc.stream_queue_cnt == 0)) {
4811 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4812 }
4813 }
4814 break;
4815 /*
4816 * EY - nr_sack: If the received chunk is an
4817 * nr_sack chunk
4818 */
4819 case SCTP_NR_SELECTIVE_ACK:
4820 {
4821 struct sctp_nr_sack_chunk *nr_sack;
4822 int abort_now = 0;
4823 uint32_t a_rwnd, cum_ack;
4824 uint16_t num_seg, num_nr_seg, num_dup;
4825 uint8_t flags;
4826 int offset_seg, offset_dup;
4827
4828 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4829 SCTP_STAT_INCR(sctps_recvsacks);
4830 if (stcb == NULL) {
4831 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4832 break;
4833 }
4834 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
4835 (stcb->asoc.peer_supports_nr_sack == 0)) {
4836 goto unknown_chunk;
4837 }
4838 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4839 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4840 break;
4841 }
4842 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4843 /*-
4844 * If we have sent a shutdown-ack, we will pay no
4845 * attention to a sack sent in to us since
4846 * we don't care anymore.
4847 */
4848 break;
4849 }
4850 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4851 flags = ch->chunk_flags;
4852 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4853 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4854 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4855 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4856 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4857 if (sizeof(struct sctp_nr_sack_chunk) +
4858 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4859 num_dup * sizeof(uint32_t) != chk_length) {
4860 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4861 break;
4862 }
4863 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4864 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4865 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4866 cum_ack, num_seg, a_rwnd);
4867 stcb->asoc.seen_a_sack_this_pkt = 1;
4868 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4869 (num_seg == 0) && (num_nr_seg == 0) &&
4870 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4871 (stcb->asoc.saw_sack_with_frags == 0) &&
4872 (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4873 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4874 /*
4875 * We have a SIMPLE sack having no
4876 * prior segments and data on sent
4877 * queue to be acked. Use the faster
4878 * path sack processing. We also
4879 * allow window update sacks with no
4880 * missing segments to go this way
4881 * too.
4882 */
4883 sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4884 &abort_now, ecne_seen);
4885 } else {
4886 if (netp && *netp)
4887 sctp_handle_sack(m, offset_seg, offset_dup,
4888 stcb, *netp,
4889 num_seg, num_nr_seg, num_dup, &abort_now, flags,
4890 cum_ack, a_rwnd, ecne_seen);
4891 }
4892 if (abort_now) {
4893 /* ABORT signal from sack processing */
4894 *offset = length;
4895 return (NULL);
4896 }
4897 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4898 TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4899 (stcb->asoc.stream_queue_cnt == 0)) {
4900 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4901 }
4902 }
4903 break;
4904
4905 case SCTP_HEARTBEAT_REQUEST:
4906 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4907 if ((stcb) && netp && *netp) {
4908 SCTP_STAT_INCR(sctps_recvheartbeat);
4909 sctp_send_heartbeat_ack(stcb, m, *offset,
4910 chk_length, *netp);
4911
4912 /* He's alive so give him credit */
4913 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4914 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4915 stcb->asoc.overall_error_count,
4916 0,
4917 SCTP_FROM_SCTP_INPUT,
4918 __LINE__);
4919 }
4920 stcb->asoc.overall_error_count = 0;
4921 }
4922 break;
4923 case SCTP_HEARTBEAT_ACK:
4924 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
4925 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4926 /* Its not ours */
4927 *offset = length;
4928 if (locked_tcb) {
4929 SCTP_TCB_UNLOCK(locked_tcb);
4930 }
4931 return (NULL);
4932 }
4933 /* He's alive so give him credit */
4934 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4935 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4936 stcb->asoc.overall_error_count,
4937 0,
4938 SCTP_FROM_SCTP_INPUT,
4939 __LINE__);
4940 }
4941 stcb->asoc.overall_error_count = 0;
4942 SCTP_STAT_INCR(sctps_recvheartbeatack);
4943 if (netp && *netp)
4944 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4945 stcb, *netp);
4946 break;
4947 case SCTP_ABORT_ASSOCIATION:
4948 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4949 stcb);
4950 if ((stcb) && netp && *netp)
4951 sctp_handle_abort((struct sctp_abort_chunk *)ch,
4952 stcb, *netp);
4953 *offset = length;
4954 return (NULL);
4955 break;
4956 case SCTP_SHUTDOWN:
4957 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4958 stcb);
4959 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4960 *offset = length;
4961 if (locked_tcb) {
4962 SCTP_TCB_UNLOCK(locked_tcb);
4963 }
4964 return (NULL);
4965 }
4966 if (netp && *netp) {
4967 int abort_flag = 0;
4968
4969 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4970 stcb, *netp, &abort_flag);
4971 if (abort_flag) {
4972 *offset = length;
4973 return (NULL);
4974 }
4975 }
4976 break;
4977 case SCTP_SHUTDOWN_ACK:
4978 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb);
4979 if ((stcb) && (netp) && (*netp))
4980 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4981 *offset = length;
4982 return (NULL);
4983 break;
4984
4985 case SCTP_OPERATION_ERROR:
4986 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
4987 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
4988
4989 *offset = length;
4990 return (NULL);
4991 }
4992 break;
4993 case SCTP_COOKIE_ECHO:
4994 SCTPDBG(SCTP_DEBUG_INPUT3,
4995 "SCTP_COOKIE-ECHO, stcb %p\n", stcb);
4996 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4997 ;
4998 } else {
4999 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5000 /* We are not interested anymore */
5001 abend:
5002 if (stcb) {
5003 SCTP_TCB_UNLOCK(stcb);
5004 }
5005 *offset = length;
5006 return (NULL);
5007 }
5008 }
5009 /*
5010 * First are we accepting? We do this again here
5011 * since it is possible that a previous endpoint WAS
5012 * listening responded to a INIT-ACK and then
5013 * closed. We opened and bound.. and are now no
5014 * longer listening.
5015 */
5016
5017 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5018 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5019 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5020 struct mbuf *oper;
5021 struct sctp_paramhdr *phdr;
5022
5023 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5024 0, M_DONTWAIT, 1, MT_DATA);
5025 if (oper) {
5026 SCTP_BUF_LEN(oper) =
5027 sizeof(struct sctp_paramhdr);
5028 phdr = mtod(oper,
5029 struct sctp_paramhdr *);
5030 phdr->param_type =
5031 htons(SCTP_CAUSE_OUT_OF_RESC);
5032 phdr->param_length =
5033 htons(sizeof(struct sctp_paramhdr));
5034 }
5035 sctp_abort_association(inp, stcb, m,
5036 iphlen, sh, oper, vrf_id, port);
5037 }
5038 *offset = length;
5039 return (NULL);
5040 } else {
5041 struct mbuf *ret_buf;
5042 struct sctp_inpcb *linp;
5043
5044 if (stcb) {
5045 linp = NULL;
5046 } else {
5047 linp = inp;
5048 }
5049
5050 if (linp) {
5051 SCTP_ASOC_CREATE_LOCK(linp);
5052 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5053 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5054 SCTP_ASOC_CREATE_UNLOCK(linp);
5055 goto abend;
5056 }
5057 }
5058 if (netp) {
5059 ret_buf =
5060 sctp_handle_cookie_echo(m, iphlen,
5061 *offset, sh,
5062 (struct sctp_cookie_echo_chunk *)ch,
5063 &inp, &stcb, netp,
5064 auth_skipped,
5065 auth_offset,
5066 auth_len,
5067 &locked_tcb,
5068 vrf_id,
5069 port);
5070 } else {
5071 ret_buf = NULL;
5072 }
5073 if (linp) {
5074 SCTP_ASOC_CREATE_UNLOCK(linp);
5075 }
5076 if (ret_buf == NULL) {
5077 if (locked_tcb) {
5078 SCTP_TCB_UNLOCK(locked_tcb);
5079 }
5080 SCTPDBG(SCTP_DEBUG_INPUT3,
5081 "GAK, null buffer\n");
5082 auth_skipped = 0;
5083 *offset = length;
5084 return (NULL);
5085 }
5086 /* if AUTH skipped, see if it verified... */
5087 if (auth_skipped) {
5088 got_auth = 1;
5089 auth_skipped = 0;
5090 }
5091 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5092 /*
5093 * Restart the timer if we have
5094 * pending data
5095 */
5096 struct sctp_tmit_chunk *chk;
5097
5098 chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5099 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5100 }
5101 }
5102 break;
5103 case SCTP_COOKIE_ACK:
5104 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb);
5105 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5106 if (locked_tcb) {
5107 SCTP_TCB_UNLOCK(locked_tcb);
5108 }
5109 return (NULL);
5110 }
5111 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5112 /* We are not interested anymore */
5113 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5114 ;
5115 } else if (stcb) {
5116 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5117 so = SCTP_INP_SO(inp);
5118 atomic_add_int(&stcb->asoc.refcnt, 1);
5119 SCTP_TCB_UNLOCK(stcb);
5120 SCTP_SOCKET_LOCK(so, 1);
5121 SCTP_TCB_LOCK(stcb);
5122 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5123 #endif
5124 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5125 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5126 SCTP_SOCKET_UNLOCK(so, 1);
5127 #endif
5128 *offset = length;
5129 return (NULL);
5130 }
5131 }
5132 /* He's alive so give him credit */
5133 if ((stcb) && netp && *netp) {
5134 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5135 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5136 stcb->asoc.overall_error_count,
5137 0,
5138 SCTP_FROM_SCTP_INPUT,
5139 __LINE__);
5140 }
5141 stcb->asoc.overall_error_count = 0;
5142 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5143 }
5144 break;
5145 case SCTP_ECN_ECHO:
5146 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5147 /* He's alive so give him credit */
5148 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5149 /* Its not ours */
5150 if (locked_tcb) {
5151 SCTP_TCB_UNLOCK(locked_tcb);
5152 }
5153 *offset = length;
5154 return (NULL);
5155 }
5156 if (stcb) {
5157 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5158 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5159 stcb->asoc.overall_error_count,
5160 0,
5161 SCTP_FROM_SCTP_INPUT,
5162 __LINE__);
5163 }
5164 stcb->asoc.overall_error_count = 0;
5165 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5166 stcb);
5167 ecne_seen = 1;
5168 }
5169 break;
5170 case SCTP_ECN_CWR:
5171 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5172 /* He's alive so give him credit */
5173 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5174 /* Its not ours */
5175 if (locked_tcb) {
5176 SCTP_TCB_UNLOCK(locked_tcb);
5177 }
5178 *offset = length;
5179 return (NULL);
5180 }
5181 if (stcb) {
5182 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5183 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5184 stcb->asoc.overall_error_count,
5185 0,
5186 SCTP_FROM_SCTP_INPUT,
5187 __LINE__);
5188 }
5189 stcb->asoc.overall_error_count = 0;
5190 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5191 }
5192 break;
5193 case SCTP_SHUTDOWN_COMPLETE:
5194 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb);
5195 /* must be first and only chunk */
5196 if ((num_chunks > 1) ||
5197 (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5198 *offset = length;
5199 if (locked_tcb) {
5200 SCTP_TCB_UNLOCK(locked_tcb);
5201 }
5202 return (NULL);
5203 }
5204 if ((stcb) && netp && *netp) {
5205 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5206 stcb, *netp);
5207 }
5208 *offset = length;
5209 return (NULL);
5210 break;
5211 case SCTP_ASCONF:
5212 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5213 /* He's alive so give him credit */
5214 if (stcb) {
5215 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5216 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5217 stcb->asoc.overall_error_count,
5218 0,
5219 SCTP_FROM_SCTP_INPUT,
5220 __LINE__);
5221 }
5222 stcb->asoc.overall_error_count = 0;
5223 sctp_handle_asconf(m, *offset,
5224 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5225 asconf_cnt++;
5226 }
5227 break;
5228 case SCTP_ASCONF_ACK:
5229 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5230 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5231 /* Its not ours */
5232 if (locked_tcb) {
5233 SCTP_TCB_UNLOCK(locked_tcb);
5234 }
5235 *offset = length;
5236 return (NULL);
5237 }
5238 if ((stcb) && netp && *netp) {
5239 /* He's alive so give him credit */
5240 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5241 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5242 stcb->asoc.overall_error_count,
5243 0,
5244 SCTP_FROM_SCTP_INPUT,
5245 __LINE__);
5246 }
5247 stcb->asoc.overall_error_count = 0;
5248 sctp_handle_asconf_ack(m, *offset,
5249 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5250 if (abort_no_unlock)
5251 return (NULL);
5252 }
5253 break;
5254 case SCTP_FORWARD_CUM_TSN:
5255 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5256 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5257 /* Its not ours */
5258 if (locked_tcb) {
5259 SCTP_TCB_UNLOCK(locked_tcb);
5260 }
5261 *offset = length;
5262 return (NULL);
5263 }
5264 /* He's alive so give him credit */
5265 if (stcb) {
5266 int abort_flag = 0;
5267
5268 stcb->asoc.overall_error_count = 0;
5269 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5270 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5271 stcb->asoc.overall_error_count,
5272 0,
5273 SCTP_FROM_SCTP_INPUT,
5274 __LINE__);
5275 }
5276 *fwd_tsn_seen = 1;
5277 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5278 /* We are not interested anymore */
5279 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5280 so = SCTP_INP_SO(inp);
5281 atomic_add_int(&stcb->asoc.refcnt, 1);
5282 SCTP_TCB_UNLOCK(stcb);
5283 SCTP_SOCKET_LOCK(so, 1);
5284 SCTP_TCB_LOCK(stcb);
5285 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5286 #endif
5287 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5288 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5289 SCTP_SOCKET_UNLOCK(so, 1);
5290 #endif
5291 *offset = length;
5292 return (NULL);
5293 }
5294 sctp_handle_forward_tsn(stcb,
5295 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5296 if (abort_flag) {
5297 *offset = length;
5298 return (NULL);
5299 } else {
5300 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5301 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5302 stcb->asoc.overall_error_count,
5303 0,
5304 SCTP_FROM_SCTP_INPUT,
5305 __LINE__);
5306 }
5307 stcb->asoc.overall_error_count = 0;
5308 }
5309
5310 }
5311 break;
5312 case SCTP_STREAM_RESET:
5313 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5314 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5315 /* Its not ours */
5316 if (locked_tcb) {
5317 SCTP_TCB_UNLOCK(locked_tcb);
5318 }
5319 *offset = length;
5320 return (NULL);
5321 }
5322 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5323 /* We are not interested anymore */
5324 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5325 so = SCTP_INP_SO(inp);
5326 atomic_add_int(&stcb->asoc.refcnt, 1);
5327 SCTP_TCB_UNLOCK(stcb);
5328 SCTP_SOCKET_LOCK(so, 1);
5329 SCTP_TCB_LOCK(stcb);
5330 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5331 #endif
5332 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5333 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5334 SCTP_SOCKET_UNLOCK(so, 1);
5335 #endif
5336 *offset = length;
5337 return (NULL);
5338 }
5339 if (stcb->asoc.peer_supports_strreset == 0) {
5340 /*
5341 * hmm, peer should have announced this, but
5342 * we will turn it on since he is sending us
5343 * a stream reset.
5344 */
5345 stcb->asoc.peer_supports_strreset = 1;
5346 }
5347 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) {
5348 /* stop processing */
5349 *offset = length;
5350 return (NULL);
5351 }
5352 break;
5353 case SCTP_PACKET_DROPPED:
5354 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5355 /* re-get it all please */
5356 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5357 /* Its not ours */
5358 if (locked_tcb) {
5359 SCTP_TCB_UNLOCK(locked_tcb);
5360 }
5361 *offset = length;
5362 return (NULL);
5363 }
5364 if (ch && (stcb) && netp && (*netp)) {
5365 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5366 stcb, *netp,
5367 min(chk_length, (sizeof(chunk_buf) - 4)));
5368
5369 }
5370 break;
5371
5372 case SCTP_AUTHENTICATION:
5373 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5374 if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5375 goto unknown_chunk;
5376
5377 if (stcb == NULL) {
5378 /* save the first AUTH for later processing */
5379 if (auth_skipped == 0) {
5380 auth_offset = *offset;
5381 auth_len = chk_length;
5382 auth_skipped = 1;
5383 }
5384 /* skip this chunk (temporarily) */
5385 goto next_chunk;
5386 }
5387 if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5388 (chk_length > (sizeof(struct sctp_auth_chunk) +
5389 SCTP_AUTH_DIGEST_LEN_MAX))) {
5390 /* Its not ours */
5391 if (locked_tcb) {
5392 SCTP_TCB_UNLOCK(locked_tcb);
5393 }
5394 *offset = length;
5395 return (NULL);
5396 }
5397 if (got_auth == 1) {
5398 /* skip this chunk... it's already auth'd */
5399 goto next_chunk;
5400 }
5401 got_auth = 1;
5402 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5403 m, *offset)) {
5404 /* auth HMAC failed so dump the packet */
5405 *offset = length;
5406 return (stcb);
5407 } else {
5408 /* remaining chunks are HMAC checked */
5409 stcb->asoc.authenticated = 1;
5410 }
5411 break;
5412
5413 default:
5414 unknown_chunk:
5415 /* it's an unknown chunk! */
5416 if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5417 struct mbuf *mm;
5418 struct sctp_paramhdr *phd;
5419
5420 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5421 0, M_DONTWAIT, 1, MT_DATA);
5422 if (mm) {
5423 phd = mtod(mm, struct sctp_paramhdr *);
5424 /*
5425 * We cheat and use param type since
5426 * we did not bother to define a
5427 * error cause struct. They are the
5428 * same basic format with different
5429 * names.
5430 */
5431 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5432 phd->param_length = htons(chk_length + sizeof(*phd));
5433 SCTP_BUF_LEN(mm) = sizeof(*phd);
5434 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length),
5435 M_DONTWAIT);
5436 if (SCTP_BUF_NEXT(mm)) {
5437 #ifdef SCTP_MBUF_LOGGING
5438 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5439 struct mbuf *mat;
5440
5441 mat = SCTP_BUF_NEXT(mm);
5442 while (mat) {
5443 if (SCTP_BUF_IS_EXTENDED(mat)) {
5444 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5445 }
5446 mat = SCTP_BUF_NEXT(mat);
5447 }
5448 }
5449 #endif
5450 sctp_queue_op_err(stcb, mm);
5451 } else {
5452 sctp_m_freem(mm);
5453 }
5454 }
5455 }
5456 if ((ch->chunk_type & 0x80) == 0) {
5457 /* discard this packet */
5458 *offset = length;
5459 return (stcb);
5460 } /* else skip this bad chunk and continue... */
5461 break;
5462 } /* switch (ch->chunk_type) */
5463
5464
5465 next_chunk:
5466 /* get the next chunk */
5467 *offset += SCTP_SIZE32(chk_length);
5468 if (*offset >= length) {
5469 /* no more data left in the mbuf chain */
5470 break;
5471 }
5472 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5473 sizeof(struct sctp_chunkhdr), chunk_buf);
5474 if (ch == NULL) {
5475 if (locked_tcb) {
5476 SCTP_TCB_UNLOCK(locked_tcb);
5477 }
5478 *offset = length;
5479 return (NULL);
5480 }
5481 } /* while */
5482
5483 if (asconf_cnt > 0 && stcb != NULL) {
5484 sctp_send_asconf_ack(stcb);
5485 }
5486 return (stcb);
5487 }
5488
5489
5490 #ifdef INVARIANTS
5491 #ifdef __GNUC__
5492 __attribute__((noinline))
5493 #endif
5494 void
5495 sctp_validate_no_locks(struct sctp_inpcb *inp)
5496 {
5497 struct sctp_tcb *lstcb;
5498
5499 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5500 if (mtx_owned(&lstcb->tcb_mtx)) {
5501 panic("Own lock on stcb at return from input");
5502 }
5503 }
5504 if (mtx_owned(&inp->inp_create_mtx)) {
5505 panic("Own create lock on inp");
5506 }
5507 if (mtx_owned(&inp->inp_mtx)) {
5508 panic("Own inp lock on inp");
5509 }
5510 }
5511
5512 #endif
5513
5514 /*
5515 * common input chunk processing (v4 and v6)
5516 */
5517 void
5518 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
5519 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
5520 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
5521 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port)
5522 {
5523 /*
5524 * Control chunk processing
5525 */
5526 uint32_t high_tsn;
5527 int fwd_tsn_seen = 0, data_processed = 0;
5528 struct mbuf *m = *mm;
5529 int abort_flag = 0;
5530 int un_sent;
5531 int cnt_ctrl_ready = 0;
5532
5533 SCTP_STAT_INCR(sctps_recvdatagrams);
5534 #ifdef SCTP_AUDITING_ENABLED
5535 sctp_audit_log(0xE0, 1);
5536 sctp_auditing(0, inp, stcb, net);
5537 #endif
5538
5539 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5540 m, iphlen, offset, length, stcb);
5541 if (stcb) {
5542 /* always clear this before beginning a packet */
5543 stcb->asoc.authenticated = 0;
5544 stcb->asoc.seen_a_sack_this_pkt = 0;
5545 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5546 stcb, stcb->asoc.state);
5547
5548 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5549 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5550 /*-
5551 * If we hit here, we had a ref count
5552 * up when the assoc was aborted and the
5553 * timer is clearing out the assoc, we should
5554 * NOT respond to any packet.. its OOTB.
5555 */
5556 SCTP_TCB_UNLOCK(stcb);
5557 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5558 vrf_id, port);
5559 goto out_now;
5560 }
5561 }
5562 if (IS_SCTP_CONTROL(ch)) {
5563 /* process the control portion of the SCTP packet */
5564 /* sa_ignore NO_NULL_CHK */
5565 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
5566 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port);
5567 if (stcb) {
5568 /*
5569 * This covers us if the cookie-echo was there and
5570 * it changes our INP.
5571 */
5572 inp = stcb->sctp_ep;
5573 if ((net) && (port)) {
5574 if (net->port == 0) {
5575 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5576 }
5577 net->port = port;
5578 }
5579 }
5580 } else {
5581 /*
5582 * no control chunks, so pre-process DATA chunks (these
5583 * checks are taken care of by control processing)
5584 */
5585
5586 /*
5587 * if DATA only packet, and auth is required, then punt...
5588 * can't have authenticated without any AUTH (control)
5589 * chunks
5590 */
5591 if ((stcb != NULL) &&
5592 !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5593 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5594 /* "silently" ignore */
5595 SCTP_STAT_INCR(sctps_recvauthmissing);
5596 SCTP_TCB_UNLOCK(stcb);
5597 goto out_now;
5598 }
5599 if (stcb == NULL) {
5600 /* out of the blue DATA chunk */
5601 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5602 vrf_id, port);
5603 goto out_now;
5604 }
5605 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5606 /* v_tag mismatch! */
5607 SCTP_STAT_INCR(sctps_badvtag);
5608 SCTP_TCB_UNLOCK(stcb);
5609 goto out_now;
5610 }
5611 }
5612
5613 if (stcb == NULL) {
5614 /*
5615 * no valid TCB for this packet, or we found it's a bad
5616 * packet while processing control, or we're done with this
5617 * packet (done or skip rest of data), so we drop it...
5618 */
5619 goto out_now;
5620 }
5621 /*
5622 * DATA chunk processing
5623 */
5624 /* plow through the data chunks while length > offset */
5625
5626 /*
5627 * Rest should be DATA only. Check authentication state if AUTH for
5628 * DATA is required.
5629 */
5630 if ((length > offset) &&
5631 (stcb != NULL) &&
5632 !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5633 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5634 !stcb->asoc.authenticated) {
5635 /* "silently" ignore */
5636 SCTP_STAT_INCR(sctps_recvauthmissing);
5637 SCTPDBG(SCTP_DEBUG_AUTH1,
5638 "Data chunk requires AUTH, skipped\n");
5639 goto trigger_send;
5640 }
5641 if (length > offset) {
5642 int retval;
5643
5644 /*
5645 * First check to make sure our state is correct. We would
5646 * not get here unless we really did have a tag, so we don't
5647 * abort if this happens, just dump the chunk silently.
5648 */
5649 switch (SCTP_GET_STATE(&stcb->asoc)) {
5650 case SCTP_STATE_COOKIE_ECHOED:
5651 /*
5652 * we consider data with valid tags in this state
5653 * shows us the cookie-ack was lost. Imply it was
5654 * there.
5655 */
5656 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5657 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5658 stcb->asoc.overall_error_count,
5659 0,
5660 SCTP_FROM_SCTP_INPUT,
5661 __LINE__);
5662 }
5663 stcb->asoc.overall_error_count = 0;
5664 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5665 break;
5666 case SCTP_STATE_COOKIE_WAIT:
5667 /*
5668 * We consider OOTB any data sent during asoc setup.
5669 */
5670 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5671 vrf_id, port);
5672 SCTP_TCB_UNLOCK(stcb);
5673 goto out_now;
5674 /* sa_ignore NOTREACHED */
5675 break;
5676 case SCTP_STATE_EMPTY: /* should not happen */
5677 case SCTP_STATE_INUSE: /* should not happen */
5678 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */
5679 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5680 default:
5681 SCTP_TCB_UNLOCK(stcb);
5682 goto out_now;
5683 /* sa_ignore NOTREACHED */
5684 break;
5685 case SCTP_STATE_OPEN:
5686 case SCTP_STATE_SHUTDOWN_SENT:
5687 break;
5688 }
5689 /* plow through the data chunks while length > offset */
5690 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
5691 inp, stcb, net, &high_tsn);
5692 if (retval == 2) {
5693 /*
5694 * The association aborted, NO UNLOCK needed since
5695 * the association is destroyed.
5696 */
5697 goto out_now;
5698 }
5699 data_processed = 1;
5700 /*
5701 * Anything important needs to have been m_copy'ed in
5702 * process_data
5703 */
5704 }
5705 /* take care of ecn */
5706 if ((stcb->asoc.ecn_allowed == 1) &&
5707 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5708 /* Yep, we need to add a ECNE */
5709 sctp_send_ecn_echo(stcb, net, high_tsn);
5710 }
5711 if ((data_processed == 0) && (fwd_tsn_seen)) {
5712 int was_a_gap;
5713 uint32_t highest_tsn;
5714
5715 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5716 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5717 } else {
5718 highest_tsn = stcb->asoc.highest_tsn_inside_map;
5719 }
5720 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5721 stcb->asoc.send_sack = 1;
5722 sctp_sack_check(stcb, was_a_gap, &abort_flag);
5723 if (abort_flag) {
5724 /* Again, we aborted so NO UNLOCK needed */
5725 goto out_now;
5726 }
5727 } else if (fwd_tsn_seen) {
5728 stcb->asoc.send_sack = 1;
5729 }
5730 /* trigger send of any chunks in queue... */
5731 trigger_send:
5732 #ifdef SCTP_AUDITING_ENABLED
5733 sctp_audit_log(0xE0, 2);
5734 sctp_auditing(1, inp, stcb, net);
5735 #endif
5736 SCTPDBG(SCTP_DEBUG_INPUT1,
5737 "Check for chunk output prw:%d tqe:%d tf=%d\n",
5738 stcb->asoc.peers_rwnd,
5739 TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5740 stcb->asoc.total_flight);
5741 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5742 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5743 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5744 }
5745 if (cnt_ctrl_ready ||
5746 ((un_sent) &&
5747 (stcb->asoc.peers_rwnd > 0 ||
5748 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5749 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5750 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5751 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5752 }
5753 #ifdef SCTP_AUDITING_ENABLED
5754 sctp_audit_log(0xE0, 3);
5755 sctp_auditing(2, inp, stcb, net);
5756 #endif
5757 SCTP_TCB_UNLOCK(stcb);
5758 out_now:
5759 #ifdef INVARIANTS
5760 sctp_validate_no_locks(inp);
5761 #endif
5762 return;
5763 }
5764
5765 #if 0
5766 static void
5767 sctp_print_mbuf_chain(struct mbuf *m)
5768 {
5769 for (; m; m = SCTP_BUF_NEXT(m)) {
5770 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m));
5771 if (SCTP_BUF_IS_EXTENDED(m))
5772 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m));
5773 }
5774 }
5775
5776 #endif
5777
5778 #ifdef INET
5779 void
5780 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5781 {
5782 #ifdef SCTP_MBUF_LOGGING
5783 struct mbuf *mat;
5784
5785 #endif
5786 struct mbuf *m;
5787 int iphlen;
5788 uint32_t vrf_id = 0;
5789 uint8_t ecn_bits;
5790 struct ip *ip;
5791 struct sctphdr *sh;
5792 struct sctp_inpcb *inp = NULL;
5793 struct sctp_nets *net;
5794 struct sctp_tcb *stcb = NULL;
5795 struct sctp_chunkhdr *ch;
5796 int refcount_up = 0;
5797 int length, mlen, offset;
5798
5799 #if !defined(SCTP_WITH_NO_CSUM)
5800 uint32_t check, calc_check;
5801
5802 #endif
5803
5804 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5805 SCTP_RELEASE_PKT(i_pak);
5806 return;
5807 }
5808 mlen = SCTP_HEADER_LEN(i_pak);
5809 iphlen = off;
5810 m = SCTP_HEADER_TO_CHAIN(i_pak);
5811
5812 net = NULL;
5813 SCTP_STAT_INCR(sctps_recvpackets);
5814 SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5815
5816
5817 #ifdef SCTP_MBUF_LOGGING
5818 /* Log in any input mbufs */
5819 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5820 mat = m;
5821 while (mat) {
5822 if (SCTP_BUF_IS_EXTENDED(mat)) {
5823 sctp_log_mb(mat, SCTP_MBUF_INPUT);
5824 }
5825 mat = SCTP_BUF_NEXT(mat);
5826 }
5827 }
5828 #endif
5829 #ifdef SCTP_PACKET_LOGGING
5830 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
5831 sctp_packet_log(m, mlen);
5832 #endif
5833 /*
5834 * Must take out the iphlen, since mlen expects this (only effect lb
5835 * case)
5836 */
5837 mlen -= iphlen;
5838
5839 /*
5840 * Get IP, SCTP, and first chunk header together in first mbuf.
5841 */
5842 ip = mtod(m, struct ip *);
5843 offset = iphlen + sizeof(*sh) + sizeof(*ch);
5844 if (SCTP_BUF_LEN(m) < offset) {
5845 if ((m = m_pullup(m, offset)) == 0) {
5846 SCTP_STAT_INCR(sctps_hdrops);
5847 return;
5848 }
5849 ip = mtod(m, struct ip *);
5850 }
5851 /* validate mbuf chain length with IP payload length */
5852 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) {
5853 SCTP_STAT_INCR(sctps_hdrops);
5854 goto bad;
5855 }
5856 sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5857 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
5858 SCTPDBG(SCTP_DEBUG_INPUT1,
5859 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen);
5860
5861 /* SCTP does not allow broadcasts or multicasts */
5862 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
5863 goto bad;
5864 }
5865 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) {
5866 /*
5867 * We only look at broadcast if its a front state, All
5868 * others we will not have a tcb for anyway.
5869 */
5870 goto bad;
5871 }
5872 /* validate SCTP checksum */
5873 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5874 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
5875 m->m_pkthdr.len,
5876 if_name(m->m_pkthdr.rcvif),
5877 m->m_pkthdr.csum_flags);
5878 #if defined(SCTP_WITH_NO_CSUM)
5879 SCTP_STAT_INCR(sctps_recvnocrc);
5880 #else
5881 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5882 SCTP_STAT_INCR(sctps_recvhwcrc);
5883 goto sctp_skip_csum_4;
5884 }
5885 check = sh->checksum; /* save incoming checksum */
5886 sh->checksum = 0; /* prepare for calc */
5887 calc_check = sctp_calculate_cksum(m, iphlen);
5888 sh->checksum = check;
5889 SCTP_STAT_INCR(sctps_recvswcrc);
5890 if (calc_check != check) {
5891 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n",
5892 calc_check, check, m, mlen, iphlen);
5893
5894 stcb = sctp_findassociation_addr(m, iphlen,
5895 offset - sizeof(*ch),
5896 sh, ch, &inp, &net,
5897 vrf_id);
5898 if ((net) && (port)) {
5899 if (net->port == 0) {
5900 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5901 }
5902 net->port = port;
5903 }
5904 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5905 net->flowid = m->m_pkthdr.flowid;
5906 #ifdef INVARIANTS
5907 net->flowidset = 1;
5908 #endif
5909 }
5910 if ((inp) && (stcb)) {
5911 sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
5912 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5913 } else if ((inp != NULL) && (stcb == NULL)) {
5914 refcount_up = 1;
5915 }
5916 SCTP_STAT_INCR(sctps_badsum);
5917 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5918 goto bad;
5919 }
5920 sctp_skip_csum_4:
5921 #endif
5922 /* destination port of 0 is illegal, based on RFC2960. */
5923 if (sh->dest_port == 0) {
5924 SCTP_STAT_INCR(sctps_hdrops);
5925 goto bad;
5926 }
5927 /*
5928 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
5929 * IP/SCTP/first chunk header...
5930 */
5931 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
5932 sh, ch, &inp, &net, vrf_id);
5933 if ((net) && (port)) {
5934 if (net->port == 0) {
5935 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5936 }
5937 net->port = port;
5938 }
5939 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
5940 net->flowid = m->m_pkthdr.flowid;
5941 #ifdef INVARIANTS
5942 net->flowidset = 1;
5943 #endif
5944 }
5945 /* inp's ref-count increased && stcb locked */
5946 if (inp == NULL) {
5947 struct sctp_init_chunk *init_chk, chunk_buf;
5948
5949 SCTP_STAT_INCR(sctps_noport);
5950 #ifdef ICMP_BANDLIM
5951 /*
5952 * we use the bandwidth limiting to protect against sending
5953 * too many ABORTS all at once. In this case these count the
5954 * same as an ICMP message.
5955 */
5956 if (badport_bandlim(0) < 0)
5957 goto bad;
5958 #endif /* ICMP_BANDLIM */
5959 SCTPDBG(SCTP_DEBUG_INPUT1,
5960 "Sending a ABORT from packet entry!\n");
5961 if (ch->chunk_type == SCTP_INITIATION) {
5962 /*
5963 * we do a trick here to get the INIT tag, dig in
5964 * and get the tag from the INIT and put it in the
5965 * common header.
5966 */
5967 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
5968 iphlen + sizeof(*sh), sizeof(*init_chk),
5969 (uint8_t *) & chunk_buf);
5970 if (init_chk != NULL)
5971 sh->v_tag = init_chk->init.initiate_tag;
5972 }
5973 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5974 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
5975 goto bad;
5976 }
5977 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5978 goto bad;
5979 }
5980 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
5981 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
5982 goto bad;
5983 } else if (stcb == NULL) {
5984 refcount_up = 1;
5985 }
5986 #ifdef IPSEC
5987 /*
5988 * I very much doubt any of the IPSEC stuff will work but I have no
5989 * idea, so I will leave it in place.
5990 */
5991 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5992 MODULE_GLOBAL(ipsec4stat).in_polvio++;
5993 SCTP_STAT_INCR(sctps_hdrops);
5994 goto bad;
5995 }
5996 #endif /* IPSEC */
5997
5998 /*
5999 * common chunk processing
6000 */
6001 length = ip->ip_len + iphlen;
6002 offset -= sizeof(struct sctp_chunkhdr);
6003
6004 ecn_bits = ip->ip_tos;
6005
6006 /* sa_ignore NO_NULL_CHK */
6007 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
6008 inp, stcb, net, ecn_bits, vrf_id, port);
6009 /* inp's ref-count reduced && stcb unlocked */
6010 if (m) {
6011 sctp_m_freem(m);
6012 }
6013 if ((inp) && (refcount_up)) {
6014 /* reduce ref-count */
6015 SCTP_INP_DECR_REF(inp);
6016 }
6017 return;
6018 bad:
6019 if (stcb) {
6020 SCTP_TCB_UNLOCK(stcb);
6021 }
6022 if ((inp) && (refcount_up)) {
6023 /* reduce ref-count */
6024 SCTP_INP_DECR_REF(inp);
6025 }
6026 if (m) {
6027 sctp_m_freem(m);
6028 }
6029 return;
6030 }
6031
6032 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6033 extern int *sctp_cpuarry;
6034
6035 #endif
6036
6037 void
6038 sctp_input(struct mbuf *m, int off)
6039 {
6040 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6041 struct ip *ip;
6042 struct sctphdr *sh;
6043 int offset;
6044 int cpu_to_use;
6045 uint32_t flowid, tag;
6046
6047 if (mp_ncpus > 1) {
6048 if (m->m_flags & M_FLOWID) {
6049 flowid = m->m_pkthdr.flowid;
6050 } else {
6051 /*
6052 * No flow id built by lower layers fix it so we
6053 * create one.
6054 */
6055 ip = mtod(m, struct ip *);
6056 offset = off + sizeof(*sh);
6057 if (SCTP_BUF_LEN(m) < offset) {
6058 if ((m = m_pullup(m, offset)) == 0) {
6059 SCTP_STAT_INCR(sctps_hdrops);
6060 return;
6061 }
6062 ip = mtod(m, struct ip *);
6063 }
6064 sh = (struct sctphdr *)((caddr_t)ip + off);
6065 tag = htonl(sh->v_tag);
6066 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6067 m->m_pkthdr.flowid = flowid;
6068 m->m_flags |= M_FLOWID;
6069 }
6070 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6071 sctp_queue_to_mcore(m, off, cpu_to_use);
6072 return;
6073 }
6074 #endif
6075 sctp_input_with_port(m, off, 0);
6076 }
6077
6078 #endif
Cache object: 1bc2d2f7283e0d965c6a804ca9944e3f
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