1 /*-
2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
4 * Copyright (c) 2008-2012, 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 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: releng/10.0/sys/netinet/sctp_input.c 277808 2015-01-27 19:37:02Z delphij $");
35
36 #include <netinet/sctp_os.h>
37 #include <netinet/sctp_var.h>
38 #include <netinet/sctp_sysctl.h>
39 #include <netinet/sctp_pcb.h>
40 #include <netinet/sctp_header.h>
41 #include <netinet/sctputil.h>
42 #include <netinet/sctp_output.h>
43 #include <netinet/sctp_input.h>
44 #include <netinet/sctp_auth.h>
45 #include <netinet/sctp_indata.h>
46 #include <netinet/sctp_asconf.h>
47 #include <netinet/sctp_bsd_addr.h>
48 #include <netinet/sctp_timer.h>
49 #include <netinet/sctp_crc32.h>
50 #include <netinet/udp.h>
51 #include <sys/smp.h>
52
53
54
55 static void
56 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
57 {
58 struct sctp_nets *net;
59
60 /*
61 * This now not only stops all cookie timers it also stops any INIT
62 * timers as well. This will make sure that the timers are stopped
63 * in all collision cases.
64 */
65 SCTP_TCB_LOCK_ASSERT(stcb);
66 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
67 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
68 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
69 stcb->sctp_ep,
70 stcb,
71 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
72 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
73 sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
74 stcb->sctp_ep,
75 stcb,
76 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
77 }
78 }
79 }
80
81 /* INIT handler */
82 static void
83 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
84 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
85 struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
86 struct sctp_tcb *stcb, int *abort_no_unlock,
87 uint8_t use_mflowid, uint32_t mflowid,
88 uint32_t vrf_id, uint16_t port)
89 {
90 struct sctp_init *init;
91 struct mbuf *op_err;
92
93 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
94 (void *)stcb);
95 if (stcb == NULL) {
96 SCTP_INP_RLOCK(inp);
97 }
98 /* validate length */
99 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
100 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
101 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
102 use_mflowid, mflowid,
103 vrf_id, port);
104 if (stcb)
105 *abort_no_unlock = 1;
106 goto outnow;
107 }
108 /* validate parameters */
109 init = &cp->init;
110 if (init->initiate_tag == 0) {
111 /* protocol error... send abort */
112 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
113 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
114 use_mflowid, mflowid,
115 vrf_id, port);
116 if (stcb)
117 *abort_no_unlock = 1;
118 goto outnow;
119 }
120 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
121 /* invalid parameter... send abort */
122 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
123 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
124 use_mflowid, mflowid,
125 vrf_id, port);
126 if (stcb)
127 *abort_no_unlock = 1;
128 goto outnow;
129 }
130 if (init->num_inbound_streams == 0) {
131 /* protocol error... send abort */
132 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
133 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
134 use_mflowid, mflowid,
135 vrf_id, port);
136 if (stcb)
137 *abort_no_unlock = 1;
138 goto outnow;
139 }
140 if (init->num_outbound_streams == 0) {
141 /* protocol error... send abort */
142 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
143 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
144 use_mflowid, mflowid,
145 vrf_id, port);
146 if (stcb)
147 *abort_no_unlock = 1;
148 goto outnow;
149 }
150 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
151 offset + ntohs(cp->ch.chunk_length))) {
152 /* auth parameter(s) error... send abort */
153 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, NULL,
154 use_mflowid, mflowid,
155 vrf_id, port);
156 if (stcb)
157 *abort_no_unlock = 1;
158 goto outnow;
159 }
160 /*
161 * We are only accepting if we have a socket with positive
162 * so_qlimit.
163 */
164 if ((stcb == NULL) &&
165 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
166 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
167 (inp->sctp_socket == NULL) ||
168 (inp->sctp_socket->so_qlimit == 0))) {
169 /*
170 * FIX ME ?? What about TCP model and we have a
171 * match/restart case? Actually no fix is needed. the lookup
172 * will always find the existing assoc so stcb would not be
173 * NULL. It may be questionable to do this since we COULD
174 * just send back the INIT-ACK and hope that the app did
175 * accept()'s by the time the COOKIE was sent. But there is
176 * a price to pay for COOKIE generation and I don't want to
177 * pay it on the chance that the app will actually do some
178 * accepts(). The App just looses and should NOT be in this
179 * state :-)
180 */
181 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
182 sctp_send_abort(m, iphlen, src, dst, sh, 0, NULL,
183 use_mflowid, mflowid,
184 vrf_id, port);
185 }
186 goto outnow;
187 }
188 if ((stcb != NULL) &&
189 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
190 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
191 sctp_send_shutdown_ack(stcb, NULL);
192 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
193 } else {
194 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
195 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst,
196 sh, cp,
197 use_mflowid, mflowid,
198 vrf_id, port,
199 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
200 }
201 outnow:
202 if (stcb == NULL) {
203 SCTP_INP_RUNLOCK(inp);
204 }
205 }
206
207 /*
208 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
209 */
210
211 int
212 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
213 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
214 SCTP_UNUSED
215 #endif
216 )
217 {
218 int unsent_data = 0;
219 unsigned int i;
220 struct sctp_stream_queue_pending *sp;
221 struct sctp_association *asoc;
222
223 /*
224 * This function returns the number of streams that have true unsent
225 * data on them. Note that as it looks through it will clean up any
226 * places that have old data that has been sent but left at top of
227 * stream queue.
228 */
229 asoc = &stcb->asoc;
230 SCTP_TCB_SEND_LOCK(stcb);
231 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
232 /* Check to see if some data queued */
233 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
234 /* sa_ignore FREED_MEMORY */
235 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
236 if (sp == NULL) {
237 continue;
238 }
239 if ((sp->msg_is_complete) &&
240 (sp->length == 0) &&
241 (sp->sender_all_done)) {
242 /*
243 * We are doing differed cleanup. Last time
244 * through when we took all the data the
245 * sender_all_done was not set.
246 */
247 if (sp->put_last_out == 0) {
248 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
249 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
250 sp->sender_all_done,
251 sp->length,
252 sp->msg_is_complete,
253 sp->put_last_out);
254 }
255 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
256 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
257 if (sp->net) {
258 sctp_free_remote_addr(sp->net);
259 sp->net = NULL;
260 }
261 if (sp->data) {
262 sctp_m_freem(sp->data);
263 sp->data = NULL;
264 }
265 sctp_free_a_strmoq(stcb, sp, so_locked);
266 } else {
267 unsent_data++;
268 break;
269 }
270 }
271 }
272 SCTP_TCB_SEND_UNLOCK(stcb);
273 return (unsent_data);
274 }
275
276 static int
277 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
278 {
279 struct sctp_init *init;
280 struct sctp_association *asoc;
281 struct sctp_nets *lnet;
282 unsigned int i;
283
284 init = &cp->init;
285 asoc = &stcb->asoc;
286 /* save off parameters */
287 asoc->peer_vtag = ntohl(init->initiate_tag);
288 asoc->peers_rwnd = ntohl(init->a_rwnd);
289 /* init tsn's */
290 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
291
292 if (!TAILQ_EMPTY(&asoc->nets)) {
293 /* update any ssthresh's that may have a default */
294 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
295 lnet->ssthresh = asoc->peers_rwnd;
296 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
297 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
298 }
299 }
300 }
301 SCTP_TCB_SEND_LOCK(stcb);
302 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
303 unsigned int newcnt;
304 struct sctp_stream_out *outs;
305 struct sctp_stream_queue_pending *sp, *nsp;
306 struct sctp_tmit_chunk *chk, *nchk;
307
308 /* abandon the upper streams */
309 newcnt = ntohs(init->num_inbound_streams);
310 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
311 if (chk->rec.data.stream_number >= newcnt) {
312 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
313 asoc->send_queue_cnt--;
314 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
315 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
316 #ifdef INVARIANTS
317 } else {
318 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
319 #endif
320 }
321 if (chk->data != NULL) {
322 sctp_free_bufspace(stcb, asoc, chk, 1);
323 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
324 0, chk, SCTP_SO_NOT_LOCKED);
325 if (chk->data) {
326 sctp_m_freem(chk->data);
327 chk->data = NULL;
328 }
329 }
330 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
331 /* sa_ignore FREED_MEMORY */
332 }
333 }
334 if (asoc->strmout) {
335 for (i = newcnt; i < asoc->pre_open_streams; i++) {
336 outs = &asoc->strmout[i];
337 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
338 TAILQ_REMOVE(&outs->outqueue, sp, next);
339 asoc->stream_queue_cnt--;
340 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
341 stcb, 0, sp, SCTP_SO_NOT_LOCKED);
342 if (sp->data) {
343 sctp_m_freem(sp->data);
344 sp->data = NULL;
345 }
346 if (sp->net) {
347 sctp_free_remote_addr(sp->net);
348 sp->net = NULL;
349 }
350 /* Free the chunk */
351 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
352 /* sa_ignore FREED_MEMORY */
353 }
354 }
355 }
356 /* cut back the count */
357 asoc->pre_open_streams = newcnt;
358 }
359 SCTP_TCB_SEND_UNLOCK(stcb);
360 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
361
362 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
363 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
364 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
365 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
366 }
367 /* This is the next one we expect */
368 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
369
370 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
371 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
372
373 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
374 /* open the requested streams */
375
376 if (asoc->strmin != NULL) {
377 /* Free the old ones */
378 struct sctp_queued_to_read *ctl, *nctl;
379
380 for (i = 0; i < asoc->streamincnt; i++) {
381 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
382 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
383 sctp_free_remote_addr(ctl->whoFrom);
384 ctl->whoFrom = NULL;
385 sctp_m_freem(ctl->data);
386 ctl->data = NULL;
387 sctp_free_a_readq(stcb, ctl);
388 }
389 }
390 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
391 }
392 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
393 asoc->streamincnt = ntohs(init->num_outbound_streams);
394 } else {
395 asoc->streamincnt = asoc->max_inbound_streams;
396 }
397 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
398 sizeof(struct sctp_stream_in), SCTP_M_STRMI);
399 if (asoc->strmin == NULL) {
400 /* we didn't get memory for the streams! */
401 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
402 return (-1);
403 }
404 for (i = 0; i < asoc->streamincnt; i++) {
405 asoc->strmin[i].stream_no = i;
406 asoc->strmin[i].last_sequence_delivered = 0xffff;
407 TAILQ_INIT(&asoc->strmin[i].inqueue);
408 asoc->strmin[i].delivery_started = 0;
409 }
410 /*
411 * load_address_from_init will put the addresses into the
412 * association when the COOKIE is processed or the INIT-ACK is
413 * processed. Both types of COOKIE's existing and new call this
414 * routine. It will remove addresses that are no longer in the
415 * association (for the restarting case where addresses are
416 * removed). Up front when the INIT arrives we will discard it if it
417 * is a restart and new addresses have been added.
418 */
419 /* sa_ignore MEMLEAK */
420 return (0);
421 }
422
423 /*
424 * INIT-ACK message processing/consumption returns value < 0 on error
425 */
426 static int
427 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
428 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
429 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
430 struct sctp_nets *net, int *abort_no_unlock,
431 uint8_t use_mflowid, uint32_t mflowid,
432 uint32_t vrf_id)
433 {
434 struct sctp_association *asoc;
435 struct mbuf *op_err;
436 int retval, abort_flag;
437 uint32_t initack_limit;
438 int nat_friendly = 0;
439
440 /* First verify that we have no illegal param's */
441 abort_flag = 0;
442 op_err = NULL;
443
444 op_err = sctp_arethere_unrecognized_parameters(m,
445 (offset + sizeof(struct sctp_init_chunk)),
446 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
447 if (abort_flag) {
448 /* Send an abort and notify peer */
449 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
450 *abort_no_unlock = 1;
451 return (-1);
452 }
453 asoc = &stcb->asoc;
454 asoc->peer_supports_nat = (uint8_t) nat_friendly;
455 /* process the peer's parameters in the INIT-ACK */
456 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
457 if (retval < 0) {
458 return (retval);
459 }
460 initack_limit = offset + ntohs(cp->ch.chunk_length);
461 /* load all addresses */
462 if ((retval = sctp_load_addresses_from_init(stcb, m,
463 (offset + sizeof(struct sctp_init_chunk)), initack_limit,
464 src, dst, NULL))) {
465 /* Huh, we should abort */
466 SCTPDBG(SCTP_DEBUG_INPUT1,
467 "Load addresses from INIT causes an abort %d\n",
468 retval);
469 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
470 src, dst, sh, NULL,
471 use_mflowid, mflowid,
472 vrf_id, net->port);
473 *abort_no_unlock = 1;
474 return (-1);
475 }
476 /* if the peer doesn't support asconf, flush the asconf queue */
477 if (asoc->peer_supports_asconf == 0) {
478 struct sctp_asconf_addr *param, *nparam;
479
480 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
481 TAILQ_REMOVE(&asoc->asconf_queue, param, next);
482 SCTP_FREE(param, SCTP_M_ASC_ADDR);
483 }
484 }
485 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
486 stcb->asoc.local_hmacs);
487 if (op_err) {
488 sctp_queue_op_err(stcb, op_err);
489 /* queuing will steal away the mbuf chain to the out queue */
490 op_err = NULL;
491 }
492 /* extract the cookie and queue it to "echo" it back... */
493 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
494 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
495 stcb->asoc.overall_error_count,
496 0,
497 SCTP_FROM_SCTP_INPUT,
498 __LINE__);
499 }
500 stcb->asoc.overall_error_count = 0;
501 net->error_count = 0;
502
503 /*
504 * Cancel the INIT timer, We do this first before queueing the
505 * cookie. We always cancel at the primary to assue that we are
506 * canceling the timer started by the INIT which always goes to the
507 * primary.
508 */
509 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
510 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
511
512 /* calculate the RTO */
513 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
514 SCTP_RTT_FROM_NON_DATA);
515
516 retval = sctp_send_cookie_echo(m, offset, stcb, net);
517 if (retval < 0) {
518 /*
519 * No cookie, we probably should send a op error. But in any
520 * case if there is no cookie in the INIT-ACK, we can
521 * abandon the peer, its broke.
522 */
523 if (retval == -3) {
524 /* We abort with an error of missing mandatory param */
525 op_err =
526 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
527 if (op_err) {
528 /*
529 * Expand beyond to include the mandatory
530 * param cookie
531 */
532 struct sctp_inv_mandatory_param *mp;
533
534 SCTP_BUF_LEN(op_err) =
535 sizeof(struct sctp_inv_mandatory_param);
536 mp = mtod(op_err,
537 struct sctp_inv_mandatory_param *);
538 /* Subtract the reserved param */
539 mp->length =
540 htons(sizeof(struct sctp_inv_mandatory_param) - 2);
541 mp->num_param = htonl(1);
542 mp->param = htons(SCTP_STATE_COOKIE);
543 mp->resv = 0;
544 }
545 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
546 src, dst, sh, op_err,
547 use_mflowid, mflowid,
548 vrf_id, net->port);
549 *abort_no_unlock = 1;
550 }
551 return (retval);
552 }
553 return (0);
554 }
555
556 static void
557 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
558 struct sctp_tcb *stcb, struct sctp_nets *net)
559 {
560 struct sockaddr_storage store;
561 struct sctp_nets *r_net, *f_net;
562 struct timeval tv;
563 int req_prim = 0;
564 uint16_t old_error_counter;
565
566 #ifdef INET
567 struct sockaddr_in *sin;
568
569 #endif
570 #ifdef INET6
571 struct sockaddr_in6 *sin6;
572
573 #endif
574
575 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
576 /* Invalid length */
577 return;
578 }
579 memset(&store, 0, sizeof(store));
580 switch (cp->heartbeat.hb_info.addr_family) {
581 #ifdef INET
582 case AF_INET:
583 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
584 sin = (struct sockaddr_in *)&store;
585 sin->sin_family = cp->heartbeat.hb_info.addr_family;
586 sin->sin_len = cp->heartbeat.hb_info.addr_len;
587 sin->sin_port = stcb->rport;
588 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
589 sizeof(sin->sin_addr));
590 } else {
591 return;
592 }
593 break;
594 #endif
595 #ifdef INET6
596 case AF_INET6:
597 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
598 sin6 = (struct sockaddr_in6 *)&store;
599 sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
600 sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
601 sin6->sin6_port = stcb->rport;
602 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
603 sizeof(sin6->sin6_addr));
604 } else {
605 return;
606 }
607 break;
608 #endif
609 default:
610 return;
611 }
612 r_net = sctp_findnet(stcb, (struct sockaddr *)&store);
613 if (r_net == NULL) {
614 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
615 return;
616 }
617 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
618 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
619 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
620 /*
621 * If the its a HB and it's random value is correct when can
622 * confirm the destination.
623 */
624 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
625 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
626 stcb->asoc.primary_destination = r_net;
627 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
628 f_net = TAILQ_FIRST(&stcb->asoc.nets);
629 if (f_net != r_net) {
630 /*
631 * first one on the list is NOT the primary
632 * sctp_cmpaddr() is much more efficent if
633 * the primary is the first on the list,
634 * make it so.
635 */
636 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
637 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
638 }
639 req_prim = 1;
640 }
641 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
642 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
643 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
644 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
645 }
646 old_error_counter = r_net->error_count;
647 r_net->error_count = 0;
648 r_net->hb_responded = 1;
649 tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
650 tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
651 /* Now lets do a RTO with this */
652 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
653 SCTP_RTT_FROM_NON_DATA);
654 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
655 r_net->dest_state |= SCTP_ADDR_REACHABLE;
656 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
657 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
658 }
659 if (r_net->dest_state & SCTP_ADDR_PF) {
660 r_net->dest_state &= ~SCTP_ADDR_PF;
661 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
662 }
663 if (old_error_counter > 0) {
664 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
665 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
666 }
667 if (r_net == stcb->asoc.primary_destination) {
668 if (stcb->asoc.alternate) {
669 /* release the alternate, primary is good */
670 sctp_free_remote_addr(stcb->asoc.alternate);
671 stcb->asoc.alternate = NULL;
672 }
673 }
674 /* Mobility adaptation */
675 if (req_prim) {
676 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
677 SCTP_MOBILITY_BASE) ||
678 sctp_is_mobility_feature_on(stcb->sctp_ep,
679 SCTP_MOBILITY_FASTHANDOFF)) &&
680 sctp_is_mobility_feature_on(stcb->sctp_ep,
681 SCTP_MOBILITY_PRIM_DELETED)) {
682
683 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
684 if (sctp_is_mobility_feature_on(stcb->sctp_ep,
685 SCTP_MOBILITY_FASTHANDOFF)) {
686 sctp_assoc_immediate_retrans(stcb,
687 stcb->asoc.primary_destination);
688 }
689 if (sctp_is_mobility_feature_on(stcb->sctp_ep,
690 SCTP_MOBILITY_BASE)) {
691 sctp_move_chunks_from_net(stcb,
692 stcb->asoc.deleted_primary);
693 }
694 sctp_delete_prim_timer(stcb->sctp_ep, stcb,
695 stcb->asoc.deleted_primary);
696 }
697 }
698 }
699
700 static int
701 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
702 {
703 /*
704 * return 0 means we want you to proceed with the abort non-zero
705 * means no abort processing
706 */
707 struct sctpasochead *head;
708
709 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
710 /* generate a new vtag and send init */
711 LIST_REMOVE(stcb, sctp_asocs);
712 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
713 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
714 /*
715 * put it in the bucket in the vtag hash of assoc's for the
716 * system
717 */
718 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
719 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
720 return (1);
721 }
722 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
723 /*
724 * treat like a case where the cookie expired i.e.: - dump
725 * current cookie. - generate a new vtag. - resend init.
726 */
727 /* generate a new vtag and send init */
728 LIST_REMOVE(stcb, sctp_asocs);
729 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
730 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
731 sctp_stop_all_cookie_timers(stcb);
732 sctp_toss_old_cookies(stcb, &stcb->asoc);
733 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
734 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
735 /*
736 * put it in the bucket in the vtag hash of assoc's for the
737 * system
738 */
739 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
740 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
741 return (1);
742 }
743 return (0);
744 }
745
746 static int
747 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
748 struct sctp_nets *net)
749 {
750 /*
751 * return 0 means we want you to proceed with the abort non-zero
752 * means no abort processing
753 */
754 if (stcb->asoc.peer_supports_auth == 0) {
755 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
756 return (0);
757 }
758 sctp_asconf_send_nat_state_update(stcb, net);
759 return (1);
760 }
761
762
763 static void
764 sctp_handle_abort(struct sctp_abort_chunk *abort,
765 struct sctp_tcb *stcb, struct sctp_nets *net)
766 {
767 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
768 struct socket *so;
769
770 #endif
771 uint16_t len;
772 uint16_t error;
773
774 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
775 if (stcb == NULL)
776 return;
777
778 len = ntohs(abort->ch.chunk_length);
779 if (len > sizeof(struct sctp_chunkhdr)) {
780 /*
781 * Need to check the cause codes for our two magic nat
782 * aborts which don't kill the assoc necessarily.
783 */
784 struct sctp_missing_nat_state *natc;
785
786 natc = (struct sctp_missing_nat_state *)(abort + 1);
787 error = ntohs(natc->cause);
788 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
789 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
790 abort->ch.chunk_flags);
791 if (sctp_handle_nat_colliding_state(stcb)) {
792 return;
793 }
794 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
795 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
796 abort->ch.chunk_flags);
797 if (sctp_handle_nat_missing_state(stcb, net)) {
798 return;
799 }
800 }
801 } else {
802 error = 0;
803 }
804 /* stop any receive timers */
805 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
806 /* notify user of the abort and clean up... */
807 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
808 /* free the tcb */
809 SCTP_STAT_INCR_COUNTER32(sctps_aborted);
810 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
811 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
812 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
813 }
814 #ifdef SCTP_ASOCLOG_OF_TSNS
815 sctp_print_out_track_log(stcb);
816 #endif
817 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
818 so = SCTP_INP_SO(stcb->sctp_ep);
819 atomic_add_int(&stcb->asoc.refcnt, 1);
820 SCTP_TCB_UNLOCK(stcb);
821 SCTP_SOCKET_LOCK(so, 1);
822 SCTP_TCB_LOCK(stcb);
823 atomic_subtract_int(&stcb->asoc.refcnt, 1);
824 #endif
825 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
826 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
827 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
828 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
829 SCTP_SOCKET_UNLOCK(so, 1);
830 #endif
831 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
832 }
833
834 static void
835 sctp_start_net_timers(struct sctp_tcb *stcb)
836 {
837 uint32_t cnt_hb_sent;
838 struct sctp_nets *net;
839
840 cnt_hb_sent = 0;
841 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
842 /*
843 * For each network start: 1) A pmtu timer. 2) A HB timer 3)
844 * If the dest in unconfirmed send a hb as well if under
845 * max_hb_burst have been sent.
846 */
847 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
848 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
849 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
850 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
851 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
852 cnt_hb_sent++;
853 }
854 }
855 if (cnt_hb_sent) {
856 sctp_chunk_output(stcb->sctp_ep, stcb,
857 SCTP_OUTPUT_FROM_COOKIE_ACK,
858 SCTP_SO_NOT_LOCKED);
859 }
860 }
861
862
863 static void
864 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
865 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
866 {
867 struct sctp_association *asoc;
868 int some_on_streamwheel;
869
870 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
871 struct socket *so;
872
873 #endif
874
875 SCTPDBG(SCTP_DEBUG_INPUT2,
876 "sctp_handle_shutdown: handling SHUTDOWN\n");
877 if (stcb == NULL)
878 return;
879 asoc = &stcb->asoc;
880 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
881 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
882 return;
883 }
884 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
885 /* Shutdown NOT the expected size */
886 return;
887 } else {
888 sctp_update_acked(stcb, cp, abort_flag);
889 if (*abort_flag) {
890 return;
891 }
892 }
893 if (asoc->control_pdapi) {
894 /*
895 * With a normal shutdown we assume the end of last record.
896 */
897 SCTP_INP_READ_LOCK(stcb->sctp_ep);
898 asoc->control_pdapi->end_added = 1;
899 asoc->control_pdapi->pdapi_aborted = 1;
900 asoc->control_pdapi = NULL;
901 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
902 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
903 so = SCTP_INP_SO(stcb->sctp_ep);
904 atomic_add_int(&stcb->asoc.refcnt, 1);
905 SCTP_TCB_UNLOCK(stcb);
906 SCTP_SOCKET_LOCK(so, 1);
907 SCTP_TCB_LOCK(stcb);
908 atomic_subtract_int(&stcb->asoc.refcnt, 1);
909 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
910 /* assoc was freed while we were unlocked */
911 SCTP_SOCKET_UNLOCK(so, 1);
912 return;
913 }
914 #endif
915 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
916 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
917 SCTP_SOCKET_UNLOCK(so, 1);
918 #endif
919 }
920 /* goto SHUTDOWN_RECEIVED state to block new requests */
921 if (stcb->sctp_socket) {
922 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
923 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
924 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
925 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
926 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
927 /*
928 * notify upper layer that peer has initiated a
929 * shutdown
930 */
931 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
932
933 /* reset time */
934 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
935 }
936 }
937 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
938 /*
939 * stop the shutdown timer, since we WILL move to
940 * SHUTDOWN-ACK-SENT.
941 */
942 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
943 }
944 /* Now is there unsent data on a stream somewhere? */
945 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
946
947 if (!TAILQ_EMPTY(&asoc->send_queue) ||
948 !TAILQ_EMPTY(&asoc->sent_queue) ||
949 some_on_streamwheel) {
950 /* By returning we will push more data out */
951 return;
952 } else {
953 /* no outstanding data to send, so move on... */
954 /* send SHUTDOWN-ACK */
955 /* move to SHUTDOWN-ACK-SENT state */
956 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
957 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
958 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
959 }
960 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
961 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
962 sctp_stop_timers_for_shutdown(stcb);
963 sctp_send_shutdown_ack(stcb, net);
964 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
965 stcb, net);
966 }
967 }
968
969 static void
970 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
971 struct sctp_tcb *stcb,
972 struct sctp_nets *net)
973 {
974 struct sctp_association *asoc;
975
976 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
977 struct socket *so;
978
979 so = SCTP_INP_SO(stcb->sctp_ep);
980 #endif
981 SCTPDBG(SCTP_DEBUG_INPUT2,
982 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
983 if (stcb == NULL)
984 return;
985
986 asoc = &stcb->asoc;
987 /* process according to association state */
988 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
989 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
990 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
991 sctp_send_shutdown_complete(stcb, net, 1);
992 SCTP_TCB_UNLOCK(stcb);
993 return;
994 }
995 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
996 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
997 /* unexpected SHUTDOWN-ACK... so ignore... */
998 SCTP_TCB_UNLOCK(stcb);
999 return;
1000 }
1001 if (asoc->control_pdapi) {
1002 /*
1003 * With a normal shutdown we assume the end of last record.
1004 */
1005 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1006 asoc->control_pdapi->end_added = 1;
1007 asoc->control_pdapi->pdapi_aborted = 1;
1008 asoc->control_pdapi = NULL;
1009 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1010 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1011 atomic_add_int(&stcb->asoc.refcnt, 1);
1012 SCTP_TCB_UNLOCK(stcb);
1013 SCTP_SOCKET_LOCK(so, 1);
1014 SCTP_TCB_LOCK(stcb);
1015 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1016 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1017 /* assoc was freed while we were unlocked */
1018 SCTP_SOCKET_UNLOCK(so, 1);
1019 return;
1020 }
1021 #endif
1022 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1023 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1024 SCTP_SOCKET_UNLOCK(so, 1);
1025 #endif
1026 }
1027 #ifdef INVARIANTS
1028 if (!TAILQ_EMPTY(&asoc->send_queue) ||
1029 !TAILQ_EMPTY(&asoc->sent_queue) ||
1030 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1031 panic("Queues are not empty when handling SHUTDOWN-ACK");
1032 }
1033 #endif
1034 /* stop the timer */
1035 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1036 /* send SHUTDOWN-COMPLETE */
1037 sctp_send_shutdown_complete(stcb, net, 0);
1038 /* notify upper layer protocol */
1039 if (stcb->sctp_socket) {
1040 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1041 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1042 stcb->sctp_socket->so_snd.sb_cc = 0;
1043 }
1044 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1045 }
1046 SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1047 /* free the TCB but first save off the ep */
1048 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1049 atomic_add_int(&stcb->asoc.refcnt, 1);
1050 SCTP_TCB_UNLOCK(stcb);
1051 SCTP_SOCKET_LOCK(so, 1);
1052 SCTP_TCB_LOCK(stcb);
1053 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1054 #endif
1055 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1056 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1057 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1058 SCTP_SOCKET_UNLOCK(so, 1);
1059 #endif
1060 }
1061
1062 /*
1063 * Skip past the param header and then we will find the chunk that caused the
1064 * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1065 * our peer must be broken.
1066 */
1067 static void
1068 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1069 struct sctp_nets *net)
1070 {
1071 struct sctp_chunkhdr *chk;
1072
1073 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1074 switch (chk->chunk_type) {
1075 case SCTP_ASCONF_ACK:
1076 case SCTP_ASCONF:
1077 sctp_asconf_cleanup(stcb, net);
1078 break;
1079 case SCTP_FORWARD_CUM_TSN:
1080 stcb->asoc.peer_supports_prsctp = 0;
1081 break;
1082 default:
1083 SCTPDBG(SCTP_DEBUG_INPUT2,
1084 "Peer does not support chunk type %d(%x)??\n",
1085 chk->chunk_type, (uint32_t) chk->chunk_type);
1086 break;
1087 }
1088 }
1089
1090 /*
1091 * Skip past the param header and then we will find the param that caused the
1092 * problem. There are a number of param's in a ASCONF OR the prsctp param
1093 * these will turn of specific features.
1094 */
1095 static void
1096 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1097 {
1098 struct sctp_paramhdr *pbad;
1099
1100 pbad = phdr + 1;
1101 switch (ntohs(pbad->param_type)) {
1102 /* pr-sctp draft */
1103 case SCTP_PRSCTP_SUPPORTED:
1104 stcb->asoc.peer_supports_prsctp = 0;
1105 break;
1106 case SCTP_SUPPORTED_CHUNK_EXT:
1107 break;
1108 /* draft-ietf-tsvwg-addip-sctp */
1109 case SCTP_HAS_NAT_SUPPORT:
1110 stcb->asoc.peer_supports_nat = 0;
1111 break;
1112 case SCTP_ADD_IP_ADDRESS:
1113 case SCTP_DEL_IP_ADDRESS:
1114 case SCTP_SET_PRIM_ADDR:
1115 stcb->asoc.peer_supports_asconf = 0;
1116 break;
1117 case SCTP_SUCCESS_REPORT:
1118 case SCTP_ERROR_CAUSE_IND:
1119 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1120 SCTPDBG(SCTP_DEBUG_INPUT2,
1121 "Turning off ASCONF to this strange peer\n");
1122 stcb->asoc.peer_supports_asconf = 0;
1123 break;
1124 default:
1125 SCTPDBG(SCTP_DEBUG_INPUT2,
1126 "Peer does not support param type %d(%x)??\n",
1127 pbad->param_type, (uint32_t) pbad->param_type);
1128 break;
1129 }
1130 }
1131
1132 static int
1133 sctp_handle_error(struct sctp_chunkhdr *ch,
1134 struct sctp_tcb *stcb, struct sctp_nets *net)
1135 {
1136 int chklen;
1137 struct sctp_paramhdr *phdr;
1138 uint16_t error, error_type;
1139 uint16_t error_len;
1140 struct sctp_association *asoc;
1141 int adjust;
1142
1143 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1144 struct socket *so;
1145
1146 #endif
1147
1148 /* parse through all of the errors and process */
1149 asoc = &stcb->asoc;
1150 phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1151 sizeof(struct sctp_chunkhdr));
1152 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1153 error = 0;
1154 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1155 /* Process an Error Cause */
1156 error_type = ntohs(phdr->param_type);
1157 error_len = ntohs(phdr->param_length);
1158 if ((error_len > chklen) || (error_len == 0)) {
1159 /* invalid param length for this param */
1160 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1161 chklen, error_len);
1162 return (0);
1163 }
1164 if (error == 0) {
1165 /* report the first error cause */
1166 error = error_type;
1167 }
1168 switch (error_type) {
1169 case SCTP_CAUSE_INVALID_STREAM:
1170 case SCTP_CAUSE_MISSING_PARAM:
1171 case SCTP_CAUSE_INVALID_PARAM:
1172 case SCTP_CAUSE_NO_USER_DATA:
1173 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1174 error_type);
1175 break;
1176 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1177 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1178 ch->chunk_flags);
1179 if (sctp_handle_nat_colliding_state(stcb)) {
1180 return (0);
1181 }
1182 break;
1183 case SCTP_CAUSE_NAT_MISSING_STATE:
1184 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1185 ch->chunk_flags);
1186 if (sctp_handle_nat_missing_state(stcb, net)) {
1187 return (0);
1188 }
1189 break;
1190 case SCTP_CAUSE_STALE_COOKIE:
1191 /*
1192 * We only act if we have echoed a cookie and are
1193 * waiting.
1194 */
1195 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1196 int *p;
1197
1198 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1199 /* Save the time doubled */
1200 asoc->cookie_preserve_req = ntohl(*p) << 1;
1201 asoc->stale_cookie_count++;
1202 if (asoc->stale_cookie_count >
1203 asoc->max_init_times) {
1204 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1205 /* now free the asoc */
1206 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1207 so = SCTP_INP_SO(stcb->sctp_ep);
1208 atomic_add_int(&stcb->asoc.refcnt, 1);
1209 SCTP_TCB_UNLOCK(stcb);
1210 SCTP_SOCKET_LOCK(so, 1);
1211 SCTP_TCB_LOCK(stcb);
1212 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1213 #endif
1214 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1215 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1216 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1217 SCTP_SOCKET_UNLOCK(so, 1);
1218 #endif
1219 return (-1);
1220 }
1221 /* blast back to INIT state */
1222 sctp_toss_old_cookies(stcb, &stcb->asoc);
1223 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1224 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1225 sctp_stop_all_cookie_timers(stcb);
1226 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1227 }
1228 break;
1229 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1230 /*
1231 * Nothing we can do here, we don't do hostname
1232 * addresses so if the peer does not like my IPv6
1233 * (or IPv4 for that matter) it does not matter. If
1234 * they don't support that type of address, they can
1235 * NOT possibly get that packet type... i.e. with no
1236 * IPv6 you can't recieve a IPv6 packet. so we can
1237 * safely ignore this one. If we ever added support
1238 * for HOSTNAME Addresses, then we would need to do
1239 * something here.
1240 */
1241 break;
1242 case SCTP_CAUSE_UNRECOG_CHUNK:
1243 sctp_process_unrecog_chunk(stcb, phdr, net);
1244 break;
1245 case SCTP_CAUSE_UNRECOG_PARAM:
1246 sctp_process_unrecog_param(stcb, phdr);
1247 break;
1248 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1249 /*
1250 * We ignore this since the timer will drive out a
1251 * new cookie anyway and there timer will drive us
1252 * to send a SHUTDOWN_COMPLETE. We can't send one
1253 * here since we don't have their tag.
1254 */
1255 break;
1256 case SCTP_CAUSE_DELETING_LAST_ADDR:
1257 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1258 case SCTP_CAUSE_DELETING_SRC_ADDR:
1259 /*
1260 * We should NOT get these here, but in a
1261 * ASCONF-ACK.
1262 */
1263 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1264 error_type);
1265 break;
1266 case SCTP_CAUSE_OUT_OF_RESC:
1267 /*
1268 * And what, pray tell do we do with the fact that
1269 * the peer is out of resources? Not really sure we
1270 * could do anything but abort. I suspect this
1271 * should have came WITH an abort instead of in a
1272 * OP-ERROR.
1273 */
1274 break;
1275 default:
1276 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1277 error_type);
1278 break;
1279 }
1280 adjust = SCTP_SIZE32(error_len);
1281 chklen -= adjust;
1282 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1283 }
1284 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1285 return (0);
1286 }
1287
1288 static int
1289 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1290 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1291 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1292 struct sctp_nets *net, int *abort_no_unlock,
1293 uint8_t use_mflowid, uint32_t mflowid,
1294 uint32_t vrf_id)
1295 {
1296 struct sctp_init_ack *init_ack;
1297 struct mbuf *op_err;
1298
1299 SCTPDBG(SCTP_DEBUG_INPUT2,
1300 "sctp_handle_init_ack: handling INIT-ACK\n");
1301
1302 if (stcb == NULL) {
1303 SCTPDBG(SCTP_DEBUG_INPUT2,
1304 "sctp_handle_init_ack: TCB is null\n");
1305 return (-1);
1306 }
1307 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1308 /* Invalid length */
1309 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1310 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1311 src, dst, sh, op_err,
1312 use_mflowid, mflowid,
1313 vrf_id, net->port);
1314 *abort_no_unlock = 1;
1315 return (-1);
1316 }
1317 init_ack = &cp->init;
1318 /* validate parameters */
1319 if (init_ack->initiate_tag == 0) {
1320 /* protocol error... send an abort */
1321 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1322 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1323 src, dst, sh, op_err,
1324 use_mflowid, mflowid,
1325 vrf_id, net->port);
1326 *abort_no_unlock = 1;
1327 return (-1);
1328 }
1329 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1330 /* protocol error... send an abort */
1331 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1332 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1333 src, dst, sh, op_err,
1334 use_mflowid, mflowid,
1335 vrf_id, net->port);
1336 *abort_no_unlock = 1;
1337 return (-1);
1338 }
1339 if (init_ack->num_inbound_streams == 0) {
1340 /* protocol error... send an abort */
1341 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1342 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1343 src, dst, sh, op_err,
1344 use_mflowid, mflowid,
1345 vrf_id, net->port);
1346 *abort_no_unlock = 1;
1347 return (-1);
1348 }
1349 if (init_ack->num_outbound_streams == 0) {
1350 /* protocol error... send an abort */
1351 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1352 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1353 src, dst, sh, op_err,
1354 use_mflowid, mflowid,
1355 vrf_id, net->port);
1356 *abort_no_unlock = 1;
1357 return (-1);
1358 }
1359 /* process according to association state... */
1360 switch (stcb->asoc.state & SCTP_STATE_MASK) {
1361 case SCTP_STATE_COOKIE_WAIT:
1362 /* this is the expected state for this chunk */
1363 /* process the INIT-ACK parameters */
1364 if (stcb->asoc.primary_destination->dest_state &
1365 SCTP_ADDR_UNCONFIRMED) {
1366 /*
1367 * The primary is where we sent the INIT, we can
1368 * always consider it confirmed when the INIT-ACK is
1369 * returned. Do this before we load addresses
1370 * though.
1371 */
1372 stcb->asoc.primary_destination->dest_state &=
1373 ~SCTP_ADDR_UNCONFIRMED;
1374 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1375 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1376 }
1377 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1378 net, abort_no_unlock,
1379 use_mflowid, mflowid,
1380 vrf_id) < 0) {
1381 /* error in parsing parameters */
1382 return (-1);
1383 }
1384 /* update our state */
1385 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1386 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1387
1388 /* reset the RTO calc */
1389 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1390 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1391 stcb->asoc.overall_error_count,
1392 0,
1393 SCTP_FROM_SCTP_INPUT,
1394 __LINE__);
1395 }
1396 stcb->asoc.overall_error_count = 0;
1397 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1398 /*
1399 * collapse the init timer back in case of a exponential
1400 * backoff
1401 */
1402 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1403 stcb, net);
1404 /*
1405 * the send at the end of the inbound data processing will
1406 * cause the cookie to be sent
1407 */
1408 break;
1409 case SCTP_STATE_SHUTDOWN_SENT:
1410 /* incorrect state... discard */
1411 break;
1412 case SCTP_STATE_COOKIE_ECHOED:
1413 /* incorrect state... discard */
1414 break;
1415 case SCTP_STATE_OPEN:
1416 /* incorrect state... discard */
1417 break;
1418 case SCTP_STATE_EMPTY:
1419 case SCTP_STATE_INUSE:
1420 default:
1421 /* incorrect state... discard */
1422 return (-1);
1423 break;
1424 }
1425 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1426 return (0);
1427 }
1428
1429 static struct sctp_tcb *
1430 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1431 struct sockaddr *src, struct sockaddr *dst,
1432 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1433 struct sctp_inpcb *inp, struct sctp_nets **netp,
1434 struct sockaddr *init_src, int *notification,
1435 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1436 uint8_t use_mflowid, uint32_t mflowid,
1437 uint32_t vrf_id, uint16_t port);
1438
1439
1440 /*
1441 * handle a state cookie for an existing association m: input packet mbuf
1442 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1443 * "split" mbuf and the cookie signature does not exist offset: offset into
1444 * mbuf to the cookie-echo chunk
1445 */
1446 static struct sctp_tcb *
1447 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1448 struct sockaddr *src, struct sockaddr *dst,
1449 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1450 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1451 struct sockaddr *init_src, int *notification,
1452 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1453 uint8_t use_mflowid, uint32_t mflowid,
1454 uint32_t vrf_id, uint16_t port)
1455 {
1456 struct sctp_association *asoc;
1457 struct sctp_init_chunk *init_cp, init_buf;
1458 struct sctp_init_ack_chunk *initack_cp, initack_buf;
1459 struct sctp_nets *net;
1460 struct mbuf *op_err;
1461 struct sctp_paramhdr *ph;
1462 int init_offset, initack_offset, i;
1463 int retval;
1464 int spec_flag = 0;
1465 uint32_t how_indx;
1466
1467 net = *netp;
1468 /* I know that the TCB is non-NULL from the caller */
1469 asoc = &stcb->asoc;
1470 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1471 if (asoc->cookie_how[how_indx] == 0)
1472 break;
1473 }
1474 if (how_indx < sizeof(asoc->cookie_how)) {
1475 asoc->cookie_how[how_indx] = 1;
1476 }
1477 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1478 /* SHUTDOWN came in after sending INIT-ACK */
1479 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1480 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1481 0, M_NOWAIT, 1, MT_DATA);
1482 if (op_err == NULL) {
1483 /* FOOBAR */
1484 return (NULL);
1485 }
1486 /* Set the len */
1487 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1488 ph = mtod(op_err, struct sctp_paramhdr *);
1489 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1490 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1491 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1492 use_mflowid, mflowid,
1493 vrf_id, net->port);
1494 if (how_indx < sizeof(asoc->cookie_how))
1495 asoc->cookie_how[how_indx] = 2;
1496 return (NULL);
1497 }
1498 /*
1499 * find and validate the INIT chunk in the cookie (peer's info) the
1500 * INIT should start after the cookie-echo header struct (chunk
1501 * header, state cookie header struct)
1502 */
1503 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1504
1505 init_cp = (struct sctp_init_chunk *)
1506 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1507 (uint8_t *) & init_buf);
1508 if (init_cp == NULL) {
1509 /* could not pull a INIT chunk in cookie */
1510 return (NULL);
1511 }
1512 if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1513 return (NULL);
1514 }
1515 /*
1516 * find and validate the INIT-ACK chunk in the cookie (my info) the
1517 * INIT-ACK follows the INIT chunk
1518 */
1519 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1520 initack_cp = (struct sctp_init_ack_chunk *)
1521 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1522 (uint8_t *) & initack_buf);
1523 if (initack_cp == NULL) {
1524 /* could not pull INIT-ACK chunk in cookie */
1525 return (NULL);
1526 }
1527 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1528 return (NULL);
1529 }
1530 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1531 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1532 /*
1533 * case D in Section 5.2.4 Table 2: MMAA process accordingly
1534 * to get into the OPEN state
1535 */
1536 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1537 /*-
1538 * Opps, this means that we somehow generated two vtag's
1539 * the same. I.e. we did:
1540 * Us Peer
1541 * <---INIT(tag=a)------
1542 * ----INIT-ACK(tag=t)-->
1543 * ----INIT(tag=t)------> *1
1544 * <---INIT-ACK(tag=a)---
1545 * <----CE(tag=t)------------- *2
1546 *
1547 * At point *1 we should be generating a different
1548 * tag t'. Which means we would throw away the CE and send
1549 * ours instead. Basically this is case C (throw away side).
1550 */
1551 if (how_indx < sizeof(asoc->cookie_how))
1552 asoc->cookie_how[how_indx] = 17;
1553 return (NULL);
1554
1555 }
1556 switch SCTP_GET_STATE
1557 (asoc) {
1558 case SCTP_STATE_COOKIE_WAIT:
1559 case SCTP_STATE_COOKIE_ECHOED:
1560 /*
1561 * INIT was sent but got a COOKIE_ECHO with the
1562 * correct tags... just accept it...but we must
1563 * process the init so that we can make sure we have
1564 * the right seq no's.
1565 */
1566 /* First we must process the INIT !! */
1567 retval = sctp_process_init(init_cp, stcb);
1568 if (retval < 0) {
1569 if (how_indx < sizeof(asoc->cookie_how))
1570 asoc->cookie_how[how_indx] = 3;
1571 return (NULL);
1572 }
1573 /* we have already processed the INIT so no problem */
1574 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1575 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1576 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1577 /* update current state */
1578 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1579 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1580 else
1581 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1582
1583 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1584 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1585 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1586 stcb->sctp_ep, stcb, asoc->primary_destination);
1587 }
1588 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1589 sctp_stop_all_cookie_timers(stcb);
1590 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1591 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1592 (inp->sctp_socket->so_qlimit == 0)
1593 ) {
1594 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1595 struct socket *so;
1596
1597 #endif
1598 /*
1599 * Here is where collision would go if we
1600 * did a connect() and instead got a
1601 * init/init-ack/cookie done before the
1602 * init-ack came back..
1603 */
1604 stcb->sctp_ep->sctp_flags |=
1605 SCTP_PCB_FLAGS_CONNECTED;
1606 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1607 so = SCTP_INP_SO(stcb->sctp_ep);
1608 atomic_add_int(&stcb->asoc.refcnt, 1);
1609 SCTP_TCB_UNLOCK(stcb);
1610 SCTP_SOCKET_LOCK(so, 1);
1611 SCTP_TCB_LOCK(stcb);
1612 atomic_add_int(&stcb->asoc.refcnt, -1);
1613 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1614 SCTP_SOCKET_UNLOCK(so, 1);
1615 return (NULL);
1616 }
1617 #endif
1618 soisconnected(stcb->sctp_socket);
1619 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1620 SCTP_SOCKET_UNLOCK(so, 1);
1621 #endif
1622 }
1623 /* notify upper layer */
1624 *notification = SCTP_NOTIFY_ASSOC_UP;
1625 /*
1626 * since we did not send a HB make sure we don't
1627 * double things
1628 */
1629 net->hb_responded = 1;
1630 net->RTO = sctp_calculate_rto(stcb, asoc, net,
1631 &cookie->time_entered,
1632 sctp_align_unsafe_makecopy,
1633 SCTP_RTT_FROM_NON_DATA);
1634
1635 if (stcb->asoc.sctp_autoclose_ticks &&
1636 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1637 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1638 inp, stcb, NULL);
1639 }
1640 break;
1641 default:
1642 /*
1643 * we're in the OPEN state (or beyond), so peer must
1644 * have simply lost the COOKIE-ACK
1645 */
1646 break;
1647 } /* end switch */
1648 sctp_stop_all_cookie_timers(stcb);
1649 /*
1650 * We ignore the return code here.. not sure if we should
1651 * somehow abort.. but we do have an existing asoc. This
1652 * really should not fail.
1653 */
1654 if (sctp_load_addresses_from_init(stcb, m,
1655 init_offset + sizeof(struct sctp_init_chunk),
1656 initack_offset, src, dst, init_src)) {
1657 if (how_indx < sizeof(asoc->cookie_how))
1658 asoc->cookie_how[how_indx] = 4;
1659 return (NULL);
1660 }
1661 /* respond with a COOKIE-ACK */
1662 sctp_toss_old_cookies(stcb, asoc);
1663 sctp_send_cookie_ack(stcb);
1664 if (how_indx < sizeof(asoc->cookie_how))
1665 asoc->cookie_how[how_indx] = 5;
1666 return (stcb);
1667 }
1668 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1669 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1670 cookie->tie_tag_my_vtag == 0 &&
1671 cookie->tie_tag_peer_vtag == 0) {
1672 /*
1673 * case C in Section 5.2.4 Table 2: XMOO silently discard
1674 */
1675 if (how_indx < sizeof(asoc->cookie_how))
1676 asoc->cookie_how[how_indx] = 6;
1677 return (NULL);
1678 }
1679 /*
1680 * If nat support, and the below and stcb is established, send back
1681 * a ABORT(colliding state) if we are established.
1682 */
1683 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1684 (asoc->peer_supports_nat) &&
1685 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1686 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1687 (asoc->peer_vtag == 0)))) {
1688 /*
1689 * Special case - Peer's support nat. We may have two init's
1690 * that we gave out the same tag on since one was not
1691 * established.. i.e. we get INIT from host-1 behind the nat
1692 * and we respond tag-a, we get a INIT from host-2 behind
1693 * the nat and we get tag-a again. Then we bring up host-1
1694 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1695 * Now we have colliding state. We must send an abort here
1696 * with colliding state indication.
1697 */
1698 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1699 0, M_NOWAIT, 1, MT_DATA);
1700 if (op_err == NULL) {
1701 /* FOOBAR */
1702 return (NULL);
1703 }
1704 /* pre-reserve some space */
1705 #ifdef INET6
1706 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1707 #else
1708 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1709 #endif
1710 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1711 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1712 /* Set the len */
1713 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1714 ph = mtod(op_err, struct sctp_paramhdr *);
1715 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1716 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1717 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1718 use_mflowid, mflowid,
1719 vrf_id, port);
1720 return (NULL);
1721 }
1722 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1723 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1724 (asoc->peer_vtag == 0))) {
1725 /*
1726 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1727 * should be ok, re-accept peer info
1728 */
1729 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1730 /*
1731 * Extension of case C. If we hit this, then the
1732 * random number generator returned the same vtag
1733 * when we first sent our INIT-ACK and when we later
1734 * sent our INIT. The side with the seq numbers that
1735 * are different will be the one that normnally
1736 * would have hit case C. This in effect "extends"
1737 * our vtags in this collision case to be 64 bits.
1738 * The same collision could occur aka you get both
1739 * vtag and seq number the same twice in a row.. but
1740 * is much less likely. If it did happen then we
1741 * would proceed through and bring up the assoc.. we
1742 * may end up with the wrong stream setup however..
1743 * which would be bad.. but there is no way to
1744 * tell.. until we send on a stream that does not
1745 * exist :-)
1746 */
1747 if (how_indx < sizeof(asoc->cookie_how))
1748 asoc->cookie_how[how_indx] = 7;
1749
1750 return (NULL);
1751 }
1752 if (how_indx < sizeof(asoc->cookie_how))
1753 asoc->cookie_how[how_indx] = 8;
1754 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1755 sctp_stop_all_cookie_timers(stcb);
1756 /*
1757 * since we did not send a HB make sure we don't double
1758 * things
1759 */
1760 net->hb_responded = 1;
1761 if (stcb->asoc.sctp_autoclose_ticks &&
1762 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1763 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1764 NULL);
1765 }
1766 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1767 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1768
1769 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1770 /*
1771 * Ok the peer probably discarded our data (if we
1772 * echoed a cookie+data). So anything on the
1773 * sent_queue should be marked for retransmit, we
1774 * may not get something to kick us so it COULD
1775 * still take a timeout to move these.. but it can't
1776 * hurt to mark them.
1777 */
1778 struct sctp_tmit_chunk *chk;
1779
1780 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1781 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1782 chk->sent = SCTP_DATAGRAM_RESEND;
1783 sctp_flight_size_decrease(chk);
1784 sctp_total_flight_decrease(stcb, chk);
1785 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1786 spec_flag++;
1787 }
1788 }
1789
1790 }
1791 /* process the INIT info (peer's info) */
1792 retval = sctp_process_init(init_cp, stcb);
1793 if (retval < 0) {
1794 if (how_indx < sizeof(asoc->cookie_how))
1795 asoc->cookie_how[how_indx] = 9;
1796 return (NULL);
1797 }
1798 if (sctp_load_addresses_from_init(stcb, m,
1799 init_offset + sizeof(struct sctp_init_chunk),
1800 initack_offset, src, dst, init_src)) {
1801 if (how_indx < sizeof(asoc->cookie_how))
1802 asoc->cookie_how[how_indx] = 10;
1803 return (NULL);
1804 }
1805 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1806 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1807 *notification = SCTP_NOTIFY_ASSOC_UP;
1808
1809 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1810 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1811 (inp->sctp_socket->so_qlimit == 0)) {
1812 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1813 struct socket *so;
1814
1815 #endif
1816 stcb->sctp_ep->sctp_flags |=
1817 SCTP_PCB_FLAGS_CONNECTED;
1818 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1819 so = SCTP_INP_SO(stcb->sctp_ep);
1820 atomic_add_int(&stcb->asoc.refcnt, 1);
1821 SCTP_TCB_UNLOCK(stcb);
1822 SCTP_SOCKET_LOCK(so, 1);
1823 SCTP_TCB_LOCK(stcb);
1824 atomic_add_int(&stcb->asoc.refcnt, -1);
1825 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1826 SCTP_SOCKET_UNLOCK(so, 1);
1827 return (NULL);
1828 }
1829 #endif
1830 soisconnected(stcb->sctp_socket);
1831 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1832 SCTP_SOCKET_UNLOCK(so, 1);
1833 #endif
1834 }
1835 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1836 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1837 else
1838 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1839 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1840 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1841 SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1842 } else {
1843 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1844 }
1845 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1846 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1847 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1848 stcb->sctp_ep, stcb, asoc->primary_destination);
1849 }
1850 sctp_stop_all_cookie_timers(stcb);
1851 sctp_toss_old_cookies(stcb, asoc);
1852 sctp_send_cookie_ack(stcb);
1853 if (spec_flag) {
1854 /*
1855 * only if we have retrans set do we do this. What
1856 * this call does is get only the COOKIE-ACK out and
1857 * then when we return the normal call to
1858 * sctp_chunk_output will get the retrans out behind
1859 * this.
1860 */
1861 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1862 }
1863 if (how_indx < sizeof(asoc->cookie_how))
1864 asoc->cookie_how[how_indx] = 11;
1865
1866 return (stcb);
1867 }
1868 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1869 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1870 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1871 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1872 cookie->tie_tag_peer_vtag != 0) {
1873 struct sctpasochead *head;
1874
1875 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1876 struct socket *so;
1877
1878 #endif
1879
1880 if (asoc->peer_supports_nat) {
1881 /*
1882 * This is a gross gross hack. Just call the
1883 * cookie_new code since we are allowing a duplicate
1884 * association. I hope this works...
1885 */
1886 return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1887 sh, cookie, cookie_len,
1888 inp, netp, init_src, notification,
1889 auth_skipped, auth_offset, auth_len,
1890 use_mflowid, mflowid,
1891 vrf_id, port));
1892 }
1893 /*
1894 * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1895 */
1896 /* temp code */
1897 if (how_indx < sizeof(asoc->cookie_how))
1898 asoc->cookie_how[how_indx] = 12;
1899 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1900 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1901
1902 /* notify upper layer */
1903 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1904 atomic_add_int(&stcb->asoc.refcnt, 1);
1905 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1906 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1907 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1908 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1909 }
1910 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1911 SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1912 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1913 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1914 }
1915 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1916 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1917 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1918 stcb->sctp_ep, stcb, asoc->primary_destination);
1919
1920 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1921 /* move to OPEN state, if not in SHUTDOWN_SENT */
1922 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1923 }
1924 asoc->pre_open_streams =
1925 ntohs(initack_cp->init.num_outbound_streams);
1926 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1927 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1928 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1929
1930 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1931
1932 asoc->str_reset_seq_in = asoc->init_seq_number;
1933
1934 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1935 if (asoc->mapping_array) {
1936 memset(asoc->mapping_array, 0,
1937 asoc->mapping_array_size);
1938 }
1939 if (asoc->nr_mapping_array) {
1940 memset(asoc->nr_mapping_array, 0,
1941 asoc->mapping_array_size);
1942 }
1943 SCTP_TCB_UNLOCK(stcb);
1944 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1945 so = SCTP_INP_SO(stcb->sctp_ep);
1946 SCTP_SOCKET_LOCK(so, 1);
1947 #endif
1948 SCTP_INP_INFO_WLOCK();
1949 SCTP_INP_WLOCK(stcb->sctp_ep);
1950 SCTP_TCB_LOCK(stcb);
1951 atomic_add_int(&stcb->asoc.refcnt, -1);
1952 /* send up all the data */
1953 SCTP_TCB_SEND_LOCK(stcb);
1954
1955 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1956 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1957 stcb->asoc.strmout[i].chunks_on_queues = 0;
1958 stcb->asoc.strmout[i].stream_no = i;
1959 stcb->asoc.strmout[i].next_sequence_send = 0;
1960 stcb->asoc.strmout[i].last_msg_incomplete = 0;
1961 }
1962 /* process the INIT-ACK info (my info) */
1963 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1964 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1965
1966 /* pull from vtag hash */
1967 LIST_REMOVE(stcb, sctp_asocs);
1968 /* re-insert to new vtag position */
1969 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1970 SCTP_BASE_INFO(hashasocmark))];
1971 /*
1972 * put it in the bucket in the vtag hash of assoc's for the
1973 * system
1974 */
1975 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1976
1977 SCTP_TCB_SEND_UNLOCK(stcb);
1978 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1979 SCTP_INP_INFO_WUNLOCK();
1980 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1981 SCTP_SOCKET_UNLOCK(so, 1);
1982 #endif
1983 asoc->total_flight = 0;
1984 asoc->total_flight_count = 0;
1985 /* process the INIT info (peer's info) */
1986 retval = sctp_process_init(init_cp, stcb);
1987 if (retval < 0) {
1988 if (how_indx < sizeof(asoc->cookie_how))
1989 asoc->cookie_how[how_indx] = 13;
1990
1991 return (NULL);
1992 }
1993 /*
1994 * since we did not send a HB make sure we don't double
1995 * things
1996 */
1997 net->hb_responded = 1;
1998
1999 if (sctp_load_addresses_from_init(stcb, m,
2000 init_offset + sizeof(struct sctp_init_chunk),
2001 initack_offset, src, dst, init_src)) {
2002 if (how_indx < sizeof(asoc->cookie_how))
2003 asoc->cookie_how[how_indx] = 14;
2004
2005 return (NULL);
2006 }
2007 /* respond with a COOKIE-ACK */
2008 sctp_stop_all_cookie_timers(stcb);
2009 sctp_toss_old_cookies(stcb, asoc);
2010 sctp_send_cookie_ack(stcb);
2011 if (how_indx < sizeof(asoc->cookie_how))
2012 asoc->cookie_how[how_indx] = 15;
2013
2014 return (stcb);
2015 }
2016 if (how_indx < sizeof(asoc->cookie_how))
2017 asoc->cookie_how[how_indx] = 16;
2018 /* all other cases... */
2019 return (NULL);
2020 }
2021
2022
2023 /*
2024 * handle a state cookie for a new association m: input packet mbuf chain--
2025 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2026 * and the cookie signature does not exist offset: offset into mbuf to the
2027 * cookie-echo chunk length: length of the cookie chunk to: where the init
2028 * was from returns a new TCB
2029 */
2030 static struct sctp_tcb *
2031 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2032 struct sockaddr *src, struct sockaddr *dst,
2033 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2034 struct sctp_inpcb *inp, struct sctp_nets **netp,
2035 struct sockaddr *init_src, int *notification,
2036 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2037 uint8_t use_mflowid, uint32_t mflowid,
2038 uint32_t vrf_id, uint16_t port)
2039 {
2040 struct sctp_tcb *stcb;
2041 struct sctp_init_chunk *init_cp, init_buf;
2042 struct sctp_init_ack_chunk *initack_cp, initack_buf;
2043 struct sockaddr_storage sa_store;
2044 struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
2045 struct sctp_association *asoc;
2046 int init_offset, initack_offset, initack_limit;
2047 int retval;
2048 int error = 0;
2049 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2050
2051 #ifdef INET
2052 struct sockaddr_in *sin;
2053
2054 #endif
2055 #ifdef INET6
2056 struct sockaddr_in6 *sin6;
2057
2058 #endif
2059 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2060 struct socket *so;
2061
2062 so = SCTP_INP_SO(inp);
2063 #endif
2064
2065 /*
2066 * find and validate the INIT chunk in the cookie (peer's info) the
2067 * INIT should start after the cookie-echo header struct (chunk
2068 * header, state cookie header struct)
2069 */
2070 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2071 init_cp = (struct sctp_init_chunk *)
2072 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2073 (uint8_t *) & init_buf);
2074 if (init_cp == NULL) {
2075 /* could not pull a INIT chunk in cookie */
2076 SCTPDBG(SCTP_DEBUG_INPUT1,
2077 "process_cookie_new: could not pull INIT chunk hdr\n");
2078 return (NULL);
2079 }
2080 if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2081 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2082 return (NULL);
2083 }
2084 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2085 /*
2086 * find and validate the INIT-ACK chunk in the cookie (my info) the
2087 * INIT-ACK follows the INIT chunk
2088 */
2089 initack_cp = (struct sctp_init_ack_chunk *)
2090 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2091 (uint8_t *) & initack_buf);
2092 if (initack_cp == NULL) {
2093 /* could not pull INIT-ACK chunk in cookie */
2094 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2095 return (NULL);
2096 }
2097 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2098 return (NULL);
2099 }
2100 /*
2101 * NOTE: We can't use the INIT_ACK's chk_length to determine the
2102 * "initack_limit" value. This is because the chk_length field
2103 * includes the length of the cookie, but the cookie is omitted when
2104 * the INIT and INIT_ACK are tacked onto the cookie...
2105 */
2106 initack_limit = offset + cookie_len;
2107
2108 /*
2109 * now that we know the INIT/INIT-ACK are in place, create a new TCB
2110 * and popluate
2111 */
2112
2113 /*
2114 * Here we do a trick, we set in NULL for the proc/thread argument.
2115 * We do this since in effect we only use the p argument when the
2116 * socket is unbound and we must do an implicit bind. Since we are
2117 * getting a cookie, we cannot be unbound.
2118 */
2119 stcb = sctp_aloc_assoc(inp, init_src, &error,
2120 ntohl(initack_cp->init.initiate_tag), vrf_id,
2121 (struct thread *)NULL
2122 );
2123 if (stcb == NULL) {
2124 struct mbuf *op_err;
2125
2126 /* memory problem? */
2127 SCTPDBG(SCTP_DEBUG_INPUT1,
2128 "process_cookie_new: no room for another TCB!\n");
2129 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2130
2131 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2132 src, dst, sh, op_err,
2133 use_mflowid, mflowid,
2134 vrf_id, port);
2135 return (NULL);
2136 }
2137 /* get the correct sctp_nets */
2138 if (netp)
2139 *netp = sctp_findnet(stcb, init_src);
2140
2141 asoc = &stcb->asoc;
2142 /* get scope variables out of cookie */
2143 asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2144 asoc->scope.site_scope = cookie->site_scope;
2145 asoc->scope.local_scope = cookie->local_scope;
2146 asoc->scope.loopback_scope = cookie->loopback_scope;
2147
2148 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2149 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2150 struct mbuf *op_err;
2151
2152 /*
2153 * Houston we have a problem. The EP changed while the
2154 * cookie was in flight. Only recourse is to abort the
2155 * association.
2156 */
2157 atomic_add_int(&stcb->asoc.refcnt, 1);
2158 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2159 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2160 src, dst, sh, op_err,
2161 use_mflowid, mflowid,
2162 vrf_id, port);
2163 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2164 SCTP_TCB_UNLOCK(stcb);
2165 SCTP_SOCKET_LOCK(so, 1);
2166 SCTP_TCB_LOCK(stcb);
2167 #endif
2168 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2169 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2170 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2171 SCTP_SOCKET_UNLOCK(so, 1);
2172 #endif
2173 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2174 return (NULL);
2175 }
2176 /* process the INIT-ACK info (my info) */
2177 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2178 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2179 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2180 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2181 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2182 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2183 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2184 asoc->str_reset_seq_in = asoc->init_seq_number;
2185
2186 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2187
2188 /* process the INIT info (peer's info) */
2189 if (netp)
2190 retval = sctp_process_init(init_cp, stcb);
2191 else
2192 retval = 0;
2193 if (retval < 0) {
2194 atomic_add_int(&stcb->asoc.refcnt, 1);
2195 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2196 SCTP_TCB_UNLOCK(stcb);
2197 SCTP_SOCKET_LOCK(so, 1);
2198 SCTP_TCB_LOCK(stcb);
2199 #endif
2200 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2201 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2202 SCTP_SOCKET_UNLOCK(so, 1);
2203 #endif
2204 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2205 return (NULL);
2206 }
2207 /* load all addresses */
2208 if (sctp_load_addresses_from_init(stcb, m,
2209 init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2210 src, dst, init_src)) {
2211 atomic_add_int(&stcb->asoc.refcnt, 1);
2212 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2213 SCTP_TCB_UNLOCK(stcb);
2214 SCTP_SOCKET_LOCK(so, 1);
2215 SCTP_TCB_LOCK(stcb);
2216 #endif
2217 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2218 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2219 SCTP_SOCKET_UNLOCK(so, 1);
2220 #endif
2221 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2222 return (NULL);
2223 }
2224 /*
2225 * verify any preceding AUTH chunk that was skipped
2226 */
2227 /* pull the local authentication parameters from the cookie/init-ack */
2228 sctp_auth_get_cookie_params(stcb, m,
2229 initack_offset + sizeof(struct sctp_init_ack_chunk),
2230 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2231 if (auth_skipped) {
2232 struct sctp_auth_chunk *auth;
2233
2234 auth = (struct sctp_auth_chunk *)
2235 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2236 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2237 /* auth HMAC failed, dump the assoc and packet */
2238 SCTPDBG(SCTP_DEBUG_AUTH1,
2239 "COOKIE-ECHO: AUTH failed\n");
2240 atomic_add_int(&stcb->asoc.refcnt, 1);
2241 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2242 SCTP_TCB_UNLOCK(stcb);
2243 SCTP_SOCKET_LOCK(so, 1);
2244 SCTP_TCB_LOCK(stcb);
2245 #endif
2246 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2247 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2248 SCTP_SOCKET_UNLOCK(so, 1);
2249 #endif
2250 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2251 return (NULL);
2252 } else {
2253 /* remaining chunks checked... good to go */
2254 stcb->asoc.authenticated = 1;
2255 }
2256 }
2257 /* update current state */
2258 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2259 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2260 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2261 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2262 stcb->sctp_ep, stcb, asoc->primary_destination);
2263 }
2264 sctp_stop_all_cookie_timers(stcb);
2265 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2266 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2267
2268 /*
2269 * if we're doing ASCONFs, check to see if we have any new local
2270 * addresses that need to get added to the peer (eg. addresses
2271 * changed while cookie echo in flight). This needs to be done
2272 * after we go to the OPEN state to do the correct asconf
2273 * processing. else, make sure we have the correct addresses in our
2274 * lists
2275 */
2276
2277 /* warning, we re-use sin, sin6, sa_store here! */
2278 /* pull in local_address (our "from" address) */
2279 switch (cookie->laddr_type) {
2280 #ifdef INET
2281 case SCTP_IPV4_ADDRESS:
2282 /* source addr is IPv4 */
2283 sin = (struct sockaddr_in *)initack_src;
2284 memset(sin, 0, sizeof(*sin));
2285 sin->sin_family = AF_INET;
2286 sin->sin_len = sizeof(struct sockaddr_in);
2287 sin->sin_addr.s_addr = cookie->laddress[0];
2288 break;
2289 #endif
2290 #ifdef INET6
2291 case SCTP_IPV6_ADDRESS:
2292 /* source addr is IPv6 */
2293 sin6 = (struct sockaddr_in6 *)initack_src;
2294 memset(sin6, 0, sizeof(*sin6));
2295 sin6->sin6_family = AF_INET6;
2296 sin6->sin6_len = sizeof(struct sockaddr_in6);
2297 sin6->sin6_scope_id = cookie->scope_id;
2298 memcpy(&sin6->sin6_addr, cookie->laddress,
2299 sizeof(sin6->sin6_addr));
2300 break;
2301 #endif
2302 default:
2303 atomic_add_int(&stcb->asoc.refcnt, 1);
2304 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2305 SCTP_TCB_UNLOCK(stcb);
2306 SCTP_SOCKET_LOCK(so, 1);
2307 SCTP_TCB_LOCK(stcb);
2308 #endif
2309 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2310 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2311 SCTP_SOCKET_UNLOCK(so, 1);
2312 #endif
2313 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2314 return (NULL);
2315 }
2316
2317 /* set up to notify upper layer */
2318 *notification = SCTP_NOTIFY_ASSOC_UP;
2319 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2320 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2321 (inp->sctp_socket->so_qlimit == 0)) {
2322 /*
2323 * This is an endpoint that called connect() how it got a
2324 * cookie that is NEW is a bit of a mystery. It must be that
2325 * the INIT was sent, but before it got there.. a complete
2326 * INIT/INIT-ACK/COOKIE arrived. But of course then it
2327 * should have went to the other code.. not here.. oh well..
2328 * a bit of protection is worth having..
2329 */
2330 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2331 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2332 atomic_add_int(&stcb->asoc.refcnt, 1);
2333 SCTP_TCB_UNLOCK(stcb);
2334 SCTP_SOCKET_LOCK(so, 1);
2335 SCTP_TCB_LOCK(stcb);
2336 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2337 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2338 SCTP_SOCKET_UNLOCK(so, 1);
2339 return (NULL);
2340 }
2341 #endif
2342 soisconnected(stcb->sctp_socket);
2343 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2344 SCTP_SOCKET_UNLOCK(so, 1);
2345 #endif
2346 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2347 (inp->sctp_socket->so_qlimit)) {
2348 /*
2349 * We don't want to do anything with this one. Since it is
2350 * the listening guy. The timer will get started for
2351 * accepted connections in the caller.
2352 */
2353 ;
2354 }
2355 /* since we did not send a HB make sure we don't double things */
2356 if ((netp) && (*netp))
2357 (*netp)->hb_responded = 1;
2358
2359 if (stcb->asoc.sctp_autoclose_ticks &&
2360 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2361 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2362 }
2363 /* calculate the RTT */
2364 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2365 if ((netp) && (*netp)) {
2366 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2367 &cookie->time_entered, sctp_align_unsafe_makecopy,
2368 SCTP_RTT_FROM_NON_DATA);
2369 }
2370 /* respond with a COOKIE-ACK */
2371 sctp_send_cookie_ack(stcb);
2372
2373 /*
2374 * check the address lists for any ASCONFs that need to be sent
2375 * AFTER the cookie-ack is sent
2376 */
2377 sctp_check_address_list(stcb, m,
2378 initack_offset + sizeof(struct sctp_init_ack_chunk),
2379 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2380 initack_src, cookie->local_scope, cookie->site_scope,
2381 cookie->ipv4_scope, cookie->loopback_scope);
2382
2383
2384 return (stcb);
2385 }
2386
2387 /*
2388 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2389 * we NEED to make sure we are not already using the vtag. If so we
2390 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2391 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2392 SCTP_BASE_INFO(hashasocmark))];
2393 LIST_FOREACH(stcb, head, sctp_asocs) {
2394 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) {
2395 -- SEND ABORT - TRY AGAIN --
2396 }
2397 }
2398 */
2399
2400 /*
2401 * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2402 * existing (non-NULL) TCB
2403 */
2404 static struct mbuf *
2405 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2406 struct sockaddr *src, struct sockaddr *dst,
2407 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2408 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2409 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2410 struct sctp_tcb **locked_tcb,
2411 uint8_t use_mflowid, uint32_t mflowid,
2412 uint32_t vrf_id, uint16_t port)
2413 {
2414 struct sctp_state_cookie *cookie;
2415 struct sctp_tcb *l_stcb = *stcb;
2416 struct sctp_inpcb *l_inp;
2417 struct sockaddr *to;
2418 struct sctp_pcb *ep;
2419 struct mbuf *m_sig;
2420 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2421 uint8_t *sig;
2422 uint8_t cookie_ok = 0;
2423 unsigned int sig_offset, cookie_offset;
2424 unsigned int cookie_len;
2425 struct timeval now;
2426 struct timeval time_expires;
2427 int notification = 0;
2428 struct sctp_nets *netl;
2429 int had_a_existing_tcb = 0;
2430 int send_int_conf = 0;
2431
2432 #ifdef INET
2433 struct sockaddr_in sin;
2434
2435 #endif
2436 #ifdef INET6
2437 struct sockaddr_in6 sin6;
2438
2439 #endif
2440
2441 SCTPDBG(SCTP_DEBUG_INPUT2,
2442 "sctp_handle_cookie: handling COOKIE-ECHO\n");
2443
2444 if (inp_p == NULL) {
2445 return (NULL);
2446 }
2447 cookie = &cp->cookie;
2448 cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2449 cookie_len = ntohs(cp->ch.chunk_length);
2450
2451 if ((cookie->peerport != sh->src_port) &&
2452 (cookie->myport != sh->dest_port) &&
2453 (cookie->my_vtag != sh->v_tag)) {
2454 /*
2455 * invalid ports or bad tag. Note that we always leave the
2456 * v_tag in the header in network order and when we stored
2457 * it in the my_vtag slot we also left it in network order.
2458 * This maintains the match even though it may be in the
2459 * opposite byte order of the machine :->
2460 */
2461 return (NULL);
2462 }
2463 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2464 sizeof(struct sctp_init_chunk) +
2465 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2466 /* cookie too small */
2467 return (NULL);
2468 }
2469 /*
2470 * split off the signature into its own mbuf (since it should not be
2471 * calculated in the sctp_hmac_m() call).
2472 */
2473 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2474 m_sig = m_split(m, sig_offset, M_NOWAIT);
2475 if (m_sig == NULL) {
2476 /* out of memory or ?? */
2477 return (NULL);
2478 }
2479 #ifdef SCTP_MBUF_LOGGING
2480 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2481 struct mbuf *mat;
2482
2483 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) {
2484 if (SCTP_BUF_IS_EXTENDED(mat)) {
2485 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2486 }
2487 }
2488 }
2489 #endif
2490
2491 /*
2492 * compute the signature/digest for the cookie
2493 */
2494 ep = &(*inp_p)->sctp_ep;
2495 l_inp = *inp_p;
2496 if (l_stcb) {
2497 SCTP_TCB_UNLOCK(l_stcb);
2498 }
2499 SCTP_INP_RLOCK(l_inp);
2500 if (l_stcb) {
2501 SCTP_TCB_LOCK(l_stcb);
2502 }
2503 /* which cookie is it? */
2504 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2505 (ep->current_secret_number != ep->last_secret_number)) {
2506 /* it's the old cookie */
2507 (void)sctp_hmac_m(SCTP_HMAC,
2508 (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2509 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2510 } else {
2511 /* it's the current cookie */
2512 (void)sctp_hmac_m(SCTP_HMAC,
2513 (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2514 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2515 }
2516 /* get the signature */
2517 SCTP_INP_RUNLOCK(l_inp);
2518 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2519 if (sig == NULL) {
2520 /* couldn't find signature */
2521 sctp_m_freem(m_sig);
2522 return (NULL);
2523 }
2524 /* compare the received digest with the computed digest */
2525 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2526 /* try the old cookie? */
2527 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2528 (ep->current_secret_number != ep->last_secret_number)) {
2529 /* compute digest with old */
2530 (void)sctp_hmac_m(SCTP_HMAC,
2531 (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2532 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2533 /* compare */
2534 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2535 cookie_ok = 1;
2536 }
2537 } else {
2538 cookie_ok = 1;
2539 }
2540
2541 /*
2542 * Now before we continue we must reconstruct our mbuf so that
2543 * normal processing of any other chunks will work.
2544 */
2545 {
2546 struct mbuf *m_at;
2547
2548 m_at = m;
2549 while (SCTP_BUF_NEXT(m_at) != NULL) {
2550 m_at = SCTP_BUF_NEXT(m_at);
2551 }
2552 SCTP_BUF_NEXT(m_at) = m_sig;
2553 }
2554
2555 if (cookie_ok == 0) {
2556 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2557 SCTPDBG(SCTP_DEBUG_INPUT2,
2558 "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2559 (uint32_t) offset, cookie_offset, sig_offset);
2560 return (NULL);
2561 }
2562 /*
2563 * check the cookie timestamps to be sure it's not stale
2564 */
2565 (void)SCTP_GETTIME_TIMEVAL(&now);
2566 /* Expire time is in Ticks, so we convert to seconds */
2567 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2568 time_expires.tv_usec = cookie->time_entered.tv_usec;
2569 /*
2570 * TODO sctp_constants.h needs alternative time macros when _KERNEL
2571 * is undefined.
2572 */
2573 if (timevalcmp(&now, &time_expires, >)) {
2574 /* cookie is stale! */
2575 struct mbuf *op_err;
2576 struct sctp_stale_cookie_msg *scm;
2577 uint32_t tim;
2578
2579 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2580 0, M_NOWAIT, 1, MT_DATA);
2581 if (op_err == NULL) {
2582 /* FOOBAR */
2583 return (NULL);
2584 }
2585 /* Set the len */
2586 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2587 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2588 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2589 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2590 (sizeof(uint32_t))));
2591 /* seconds to usec */
2592 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2593 /* add in usec */
2594 if (tim == 0)
2595 tim = now.tv_usec - cookie->time_entered.tv_usec;
2596 scm->time_usec = htonl(tim);
2597 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2598 use_mflowid, mflowid,
2599 vrf_id, port);
2600 return (NULL);
2601 }
2602 /*
2603 * Now we must see with the lookup address if we have an existing
2604 * asoc. This will only happen if we were in the COOKIE-WAIT state
2605 * and a INIT collided with us and somewhere the peer sent the
2606 * cookie on another address besides the single address our assoc
2607 * had for him. In this case we will have one of the tie-tags set at
2608 * least AND the address field in the cookie can be used to look it
2609 * up.
2610 */
2611 to = NULL;
2612 switch (cookie->addr_type) {
2613 #ifdef INET6
2614 case SCTP_IPV6_ADDRESS:
2615 memset(&sin6, 0, sizeof(sin6));
2616 sin6.sin6_family = AF_INET6;
2617 sin6.sin6_len = sizeof(sin6);
2618 sin6.sin6_port = sh->src_port;
2619 sin6.sin6_scope_id = cookie->scope_id;
2620 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2621 sizeof(sin6.sin6_addr.s6_addr));
2622 to = (struct sockaddr *)&sin6;
2623 break;
2624 #endif
2625 #ifdef INET
2626 case SCTP_IPV4_ADDRESS:
2627 memset(&sin, 0, sizeof(sin));
2628 sin.sin_family = AF_INET;
2629 sin.sin_len = sizeof(sin);
2630 sin.sin_port = sh->src_port;
2631 sin.sin_addr.s_addr = cookie->address[0];
2632 to = (struct sockaddr *)&sin;
2633 break;
2634 #endif
2635 default:
2636 /* This should not happen */
2637 return (NULL);
2638 }
2639 if ((*stcb == NULL) && to) {
2640 /* Yep, lets check */
2641 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2642 if (*stcb == NULL) {
2643 /*
2644 * We should have only got back the same inp. If we
2645 * got back a different ep we have a problem. The
2646 * original findep got back l_inp and now
2647 */
2648 if (l_inp != *inp_p) {
2649 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2650 }
2651 } else {
2652 if (*locked_tcb == NULL) {
2653 /*
2654 * In this case we found the assoc only
2655 * after we locked the create lock. This
2656 * means we are in a colliding case and we
2657 * must make sure that we unlock the tcb if
2658 * its one of the cases where we throw away
2659 * the incoming packets.
2660 */
2661 *locked_tcb = *stcb;
2662
2663 /*
2664 * We must also increment the inp ref count
2665 * since the ref_count flags was set when we
2666 * did not find the TCB, now we found it
2667 * which reduces the refcount.. we must
2668 * raise it back out to balance it all :-)
2669 */
2670 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2671 if ((*stcb)->sctp_ep != l_inp) {
2672 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2673 (void *)(*stcb)->sctp_ep, (void *)l_inp);
2674 }
2675 }
2676 }
2677 }
2678 if (to == NULL) {
2679 return (NULL);
2680 }
2681 cookie_len -= SCTP_SIGNATURE_SIZE;
2682 if (*stcb == NULL) {
2683 /* this is the "normal" case... get a new TCB */
2684 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2685 cookie, cookie_len, *inp_p,
2686 netp, to, ¬ification,
2687 auth_skipped, auth_offset, auth_len,
2688 use_mflowid, mflowid,
2689 vrf_id, port);
2690 } else {
2691 /* this is abnormal... cookie-echo on existing TCB */
2692 had_a_existing_tcb = 1;
2693 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2694 src, dst, sh,
2695 cookie, cookie_len, *inp_p, *stcb, netp, to,
2696 ¬ification, auth_skipped, auth_offset, auth_len,
2697 use_mflowid, mflowid,
2698 vrf_id, port);
2699 }
2700
2701 if (*stcb == NULL) {
2702 /* still no TCB... must be bad cookie-echo */
2703 return (NULL);
2704 }
2705 if ((*netp != NULL) && (use_mflowid != 0)) {
2706 (*netp)->flowid = mflowid;
2707 #ifdef INVARIANTS
2708 (*netp)->flowidset = 1;
2709 #endif
2710 }
2711 /*
2712 * Ok, we built an association so confirm the address we sent the
2713 * INIT-ACK to.
2714 */
2715 netl = sctp_findnet(*stcb, to);
2716 /*
2717 * This code should in theory NOT run but
2718 */
2719 if (netl == NULL) {
2720 /* TSNH! Huh, why do I need to add this address here? */
2721 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2722 return (NULL);
2723 }
2724 netl = sctp_findnet(*stcb, to);
2725 }
2726 if (netl) {
2727 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2728 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2729 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2730 netl);
2731 send_int_conf = 1;
2732 }
2733 }
2734 sctp_start_net_timers(*stcb);
2735 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2736 if (!had_a_existing_tcb ||
2737 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2738 /*
2739 * If we have a NEW cookie or the connect never
2740 * reached the connected state during collision we
2741 * must do the TCP accept thing.
2742 */
2743 struct socket *so, *oso;
2744 struct sctp_inpcb *inp;
2745
2746 if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2747 /*
2748 * For a restart we will keep the same
2749 * socket, no need to do anything. I THINK!!
2750 */
2751 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2752 if (send_int_conf) {
2753 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2754 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2755 }
2756 return (m);
2757 }
2758 oso = (*inp_p)->sctp_socket;
2759 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2760 SCTP_TCB_UNLOCK((*stcb));
2761 CURVNET_SET(oso->so_vnet);
2762 so = sonewconn(oso, 0
2763 );
2764 CURVNET_RESTORE();
2765 SCTP_TCB_LOCK((*stcb));
2766 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2767
2768 if (so == NULL) {
2769 struct mbuf *op_err;
2770
2771 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2772 struct socket *pcb_so;
2773
2774 #endif
2775 /* Too many sockets */
2776 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2777 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2778 sctp_abort_association(*inp_p, NULL, m, iphlen,
2779 src, dst, sh, op_err,
2780 use_mflowid, mflowid,
2781 vrf_id, port);
2782 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2783 pcb_so = SCTP_INP_SO(*inp_p);
2784 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2785 SCTP_TCB_UNLOCK((*stcb));
2786 SCTP_SOCKET_LOCK(pcb_so, 1);
2787 SCTP_TCB_LOCK((*stcb));
2788 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2789 #endif
2790 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2791 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2792 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2793 #endif
2794 return (NULL);
2795 }
2796 inp = (struct sctp_inpcb *)so->so_pcb;
2797 SCTP_INP_INCR_REF(inp);
2798 /*
2799 * We add the unbound flag here so that if we get an
2800 * soabort() before we get the move_pcb done, we
2801 * will properly cleanup.
2802 */
2803 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2804 SCTP_PCB_FLAGS_CONNECTED |
2805 SCTP_PCB_FLAGS_IN_TCPPOOL |
2806 SCTP_PCB_FLAGS_UNBOUND |
2807 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2808 SCTP_PCB_FLAGS_DONT_WAKE);
2809 inp->sctp_features = (*inp_p)->sctp_features;
2810 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2811 inp->sctp_socket = so;
2812 inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2813 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2814 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable;
2815 inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2816 inp->sctp_context = (*inp_p)->sctp_context;
2817 inp->local_strreset_support = (*inp_p)->local_strreset_support;
2818 inp->inp_starting_point_for_iterator = NULL;
2819 /*
2820 * copy in the authentication parameters from the
2821 * original endpoint
2822 */
2823 if (inp->sctp_ep.local_hmacs)
2824 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2825 inp->sctp_ep.local_hmacs =
2826 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2827 if (inp->sctp_ep.local_auth_chunks)
2828 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2829 inp->sctp_ep.local_auth_chunks =
2830 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2831
2832 /*
2833 * Now we must move it from one hash table to
2834 * another and get the tcb in the right place.
2835 */
2836
2837 /*
2838 * This is where the one-2-one socket is put into
2839 * the accept state waiting for the accept!
2840 */
2841 if (*stcb) {
2842 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2843 }
2844 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2845
2846 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2847 SCTP_TCB_UNLOCK((*stcb));
2848
2849 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2850 0);
2851 SCTP_TCB_LOCK((*stcb));
2852 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2853
2854
2855 /*
2856 * now we must check to see if we were aborted while
2857 * the move was going on and the lock/unlock
2858 * happened.
2859 */
2860 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2861 /*
2862 * yep it was, we leave the assoc attached
2863 * to the socket since the sctp_inpcb_free()
2864 * call will send an abort for us.
2865 */
2866 SCTP_INP_DECR_REF(inp);
2867 return (NULL);
2868 }
2869 SCTP_INP_DECR_REF(inp);
2870 /* Switch over to the new guy */
2871 *inp_p = inp;
2872 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2873 if (send_int_conf) {
2874 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2875 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2876 }
2877 /*
2878 * Pull it from the incomplete queue and wake the
2879 * guy
2880 */
2881 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2882 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2883 SCTP_TCB_UNLOCK((*stcb));
2884 SCTP_SOCKET_LOCK(so, 1);
2885 #endif
2886 soisconnected(so);
2887 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2888 SCTP_TCB_LOCK((*stcb));
2889 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2890 SCTP_SOCKET_UNLOCK(so, 1);
2891 #endif
2892 return (m);
2893 }
2894 }
2895 if (notification) {
2896 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2897 }
2898 if (send_int_conf) {
2899 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2900 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2901 }
2902 return (m);
2903 }
2904
2905 static void
2906 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2907 struct sctp_tcb *stcb, struct sctp_nets *net)
2908 {
2909 /* cp must not be used, others call this without a c-ack :-) */
2910 struct sctp_association *asoc;
2911
2912 SCTPDBG(SCTP_DEBUG_INPUT2,
2913 "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2914 if (stcb == NULL)
2915 return;
2916
2917 asoc = &stcb->asoc;
2918
2919 sctp_stop_all_cookie_timers(stcb);
2920 /* process according to association state */
2921 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2922 /* state change only needed when I am in right state */
2923 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2924 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2925 sctp_start_net_timers(stcb);
2926 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2927 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2928 stcb->sctp_ep, stcb, asoc->primary_destination);
2929
2930 }
2931 /* update RTO */
2932 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2933 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2934 if (asoc->overall_error_count == 0) {
2935 net->RTO = sctp_calculate_rto(stcb, asoc, net,
2936 &asoc->time_entered, sctp_align_safe_nocopy,
2937 SCTP_RTT_FROM_NON_DATA);
2938 }
2939 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2940 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2941 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2942 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2943 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2944 struct socket *so;
2945
2946 #endif
2947 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2948 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2949 so = SCTP_INP_SO(stcb->sctp_ep);
2950 atomic_add_int(&stcb->asoc.refcnt, 1);
2951 SCTP_TCB_UNLOCK(stcb);
2952 SCTP_SOCKET_LOCK(so, 1);
2953 SCTP_TCB_LOCK(stcb);
2954 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2955 #endif
2956 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2957 soisconnected(stcb->sctp_socket);
2958 }
2959 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2960 SCTP_SOCKET_UNLOCK(so, 1);
2961 #endif
2962 }
2963 /*
2964 * since we did not send a HB make sure we don't double
2965 * things
2966 */
2967 net->hb_responded = 1;
2968
2969 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2970 /*
2971 * We don't need to do the asconf thing, nor hb or
2972 * autoclose if the socket is closed.
2973 */
2974 goto closed_socket;
2975 }
2976 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2977 stcb, net);
2978
2979
2980 if (stcb->asoc.sctp_autoclose_ticks &&
2981 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2982 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2983 stcb->sctp_ep, stcb, NULL);
2984 }
2985 /*
2986 * send ASCONF if parameters are pending and ASCONFs are
2987 * allowed (eg. addresses changed when init/cookie echo were
2988 * in flight)
2989 */
2990 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2991 (stcb->asoc.peer_supports_asconf) &&
2992 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2993 #ifdef SCTP_TIMER_BASED_ASCONF
2994 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2995 stcb->sctp_ep, stcb,
2996 stcb->asoc.primary_destination);
2997 #else
2998 sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2999 SCTP_ADDR_NOT_LOCKED);
3000 #endif
3001 }
3002 }
3003 closed_socket:
3004 /* Toss the cookie if I can */
3005 sctp_toss_old_cookies(stcb, asoc);
3006 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3007 /* Restart the timer if we have pending data */
3008 struct sctp_tmit_chunk *chk;
3009
3010 chk = TAILQ_FIRST(&asoc->sent_queue);
3011 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3012 }
3013 }
3014
3015 static void
3016 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3017 struct sctp_tcb *stcb)
3018 {
3019 struct sctp_nets *net;
3020 struct sctp_tmit_chunk *lchk;
3021 struct sctp_ecne_chunk bkup;
3022 uint8_t override_bit;
3023 uint32_t tsn, window_data_tsn;
3024 int len;
3025 unsigned int pkt_cnt;
3026
3027 len = ntohs(cp->ch.chunk_length);
3028 if ((len != sizeof(struct sctp_ecne_chunk)) &&
3029 (len != sizeof(struct old_sctp_ecne_chunk))) {
3030 return;
3031 }
3032 if (len == sizeof(struct old_sctp_ecne_chunk)) {
3033 /* Its the old format */
3034 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3035 bkup.num_pkts_since_cwr = htonl(1);
3036 cp = &bkup;
3037 }
3038 SCTP_STAT_INCR(sctps_recvecne);
3039 tsn = ntohl(cp->tsn);
3040 pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3041 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3042 if (lchk == NULL) {
3043 window_data_tsn = stcb->asoc.sending_seq - 1;
3044 } else {
3045 window_data_tsn = lchk->rec.data.TSN_seq;
3046 }
3047
3048 /* Find where it was sent to if possible. */
3049 net = NULL;
3050 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3051 if (lchk->rec.data.TSN_seq == tsn) {
3052 net = lchk->whoTo;
3053 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3054 break;
3055 }
3056 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3057 break;
3058 }
3059 }
3060 if (net == NULL) {
3061 /*
3062 * What to do. A previous send of a CWR was possibly lost.
3063 * See how old it is, we may have it marked on the actual
3064 * net.
3065 */
3066 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3067 if (tsn == net->last_cwr_tsn) {
3068 /* Found him, send it off */
3069 break;
3070 }
3071 }
3072 if (net == NULL) {
3073 /*
3074 * If we reach here, we need to send a special CWR
3075 * that says hey, we did this a long time ago and
3076 * you lost the response.
3077 */
3078 net = TAILQ_FIRST(&stcb->asoc.nets);
3079 if (net == NULL) {
3080 /* TSNH */
3081 return;
3082 }
3083 override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3084 } else {
3085 override_bit = 0;
3086 }
3087 } else {
3088 override_bit = 0;
3089 }
3090 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3091 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3092 /*
3093 * JRS - Use the congestion control given in the pluggable
3094 * CC module
3095 */
3096 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3097 /*
3098 * We reduce once every RTT. So we will only lower cwnd at
3099 * the next sending seq i.e. the window_data_tsn
3100 */
3101 net->cwr_window_tsn = window_data_tsn;
3102 net->ecn_ce_pkt_cnt += pkt_cnt;
3103 net->lost_cnt = pkt_cnt;
3104 net->last_cwr_tsn = tsn;
3105 } else {
3106 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3107 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3108 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3109 /*
3110 * Another loss in the same window update how many
3111 * marks/packets lost we have had.
3112 */
3113 int cnt = 1;
3114
3115 if (pkt_cnt > net->lost_cnt) {
3116 /* Should be the case */
3117 cnt = (pkt_cnt - net->lost_cnt);
3118 net->ecn_ce_pkt_cnt += cnt;
3119 }
3120 net->lost_cnt = pkt_cnt;
3121 net->last_cwr_tsn = tsn;
3122 /*
3123 * Most CC functions will ignore this call, since we
3124 * are in-window yet of the initial CE the peer saw.
3125 */
3126 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3127 }
3128 }
3129 /*
3130 * We always send a CWR this way if our previous one was lost our
3131 * peer will get an update, or if it is not time again to reduce we
3132 * still get the cwr to the peer. Note we set the override when we
3133 * could not find the TSN on the chunk or the destination network.
3134 */
3135 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3136 }
3137
3138 static void
3139 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3140 {
3141 /*
3142 * Here we get a CWR from the peer. We must look in the outqueue and
3143 * make sure that we have a covered ECNE in the control chunk part.
3144 * If so remove it.
3145 */
3146 struct sctp_tmit_chunk *chk;
3147 struct sctp_ecne_chunk *ecne;
3148 int override;
3149 uint32_t cwr_tsn;
3150
3151 cwr_tsn = ntohl(cp->tsn);
3152
3153 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3154 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3155 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3156 continue;
3157 }
3158 if ((override == 0) && (chk->whoTo != net)) {
3159 /* Must be from the right src unless override is set */
3160 continue;
3161 }
3162 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3163 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3164 /* this covers this ECNE, we can remove it */
3165 stcb->asoc.ecn_echo_cnt_onq--;
3166 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3167 sctp_next);
3168 if (chk->data) {
3169 sctp_m_freem(chk->data);
3170 chk->data = NULL;
3171 }
3172 stcb->asoc.ctrl_queue_cnt--;
3173 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3174 if (override == 0) {
3175 break;
3176 }
3177 }
3178 }
3179 }
3180
3181 static void
3182 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3183 struct sctp_tcb *stcb, struct sctp_nets *net)
3184 {
3185 struct sctp_association *asoc;
3186
3187 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3188 struct socket *so;
3189
3190 #endif
3191
3192 SCTPDBG(SCTP_DEBUG_INPUT2,
3193 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3194 if (stcb == NULL)
3195 return;
3196
3197 asoc = &stcb->asoc;
3198 /* process according to association state */
3199 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3200 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3201 SCTPDBG(SCTP_DEBUG_INPUT2,
3202 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3203 SCTP_TCB_UNLOCK(stcb);
3204 return;
3205 }
3206 /* notify upper layer protocol */
3207 if (stcb->sctp_socket) {
3208 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3209 }
3210 #ifdef INVARIANTS
3211 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3212 !TAILQ_EMPTY(&asoc->sent_queue) ||
3213 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3214 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3215 }
3216 #endif
3217 /* stop the timer */
3218 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3219 SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3220 /* free the TCB */
3221 SCTPDBG(SCTP_DEBUG_INPUT2,
3222 "sctp_handle_shutdown_complete: calls free-asoc\n");
3223 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3224 so = SCTP_INP_SO(stcb->sctp_ep);
3225 atomic_add_int(&stcb->asoc.refcnt, 1);
3226 SCTP_TCB_UNLOCK(stcb);
3227 SCTP_SOCKET_LOCK(so, 1);
3228 SCTP_TCB_LOCK(stcb);
3229 atomic_subtract_int(&stcb->asoc.refcnt, 1);
3230 #endif
3231 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3233 SCTP_SOCKET_UNLOCK(so, 1);
3234 #endif
3235 return;
3236 }
3237
3238 static int
3239 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3240 struct sctp_nets *net, uint8_t flg)
3241 {
3242 switch (desc->chunk_type) {
3243 case SCTP_DATA:
3244 /* find the tsn to resend (possibly */
3245 {
3246 uint32_t tsn;
3247 struct sctp_tmit_chunk *tp1;
3248
3249 tsn = ntohl(desc->tsn_ifany);
3250 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3251 if (tp1->rec.data.TSN_seq == tsn) {
3252 /* found it */
3253 break;
3254 }
3255 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3256 /* not found */
3257 tp1 = NULL;
3258 break;
3259 }
3260 }
3261 if (tp1 == NULL) {
3262 /*
3263 * Do it the other way , aka without paying
3264 * attention to queue seq order.
3265 */
3266 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3267 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3268 if (tp1->rec.data.TSN_seq == tsn) {
3269 /* found it */
3270 break;
3271 }
3272 }
3273 }
3274 if (tp1 == NULL) {
3275 SCTP_STAT_INCR(sctps_pdrptsnnf);
3276 }
3277 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3278 uint8_t *ddp;
3279
3280 if (((flg & SCTP_BADCRC) == 0) &&
3281 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3282 return (0);
3283 }
3284 if ((stcb->asoc.peers_rwnd == 0) &&
3285 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3286 SCTP_STAT_INCR(sctps_pdrpdiwnp);
3287 return (0);
3288 }
3289 if (stcb->asoc.peers_rwnd == 0 &&
3290 (flg & SCTP_FROM_MIDDLE_BOX)) {
3291 SCTP_STAT_INCR(sctps_pdrpdizrw);
3292 return (0);
3293 }
3294 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3295 sizeof(struct sctp_data_chunk));
3296 {
3297 unsigned int iii;
3298
3299 for (iii = 0; iii < sizeof(desc->data_bytes);
3300 iii++) {
3301 if (ddp[iii] != desc->data_bytes[iii]) {
3302 SCTP_STAT_INCR(sctps_pdrpbadd);
3303 return (-1);
3304 }
3305 }
3306 }
3307
3308 if (tp1->do_rtt) {
3309 /*
3310 * this guy had a RTO calculation
3311 * pending on it, cancel it
3312 */
3313 if (tp1->whoTo->rto_needed == 0) {
3314 tp1->whoTo->rto_needed = 1;
3315 }
3316 tp1->do_rtt = 0;
3317 }
3318 SCTP_STAT_INCR(sctps_pdrpmark);
3319 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3320 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3321 /*
3322 * mark it as if we were doing a FR, since
3323 * we will be getting gap ack reports behind
3324 * the info from the router.
3325 */
3326 tp1->rec.data.doing_fast_retransmit = 1;
3327 /*
3328 * mark the tsn with what sequences can
3329 * cause a new FR.
3330 */
3331 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3332 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3333 } else {
3334 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3335 }
3336
3337 /* restart the timer */
3338 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3339 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3340 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3341 stcb, tp1->whoTo);
3342
3343 /* fix counts and things */
3344 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3345 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3346 tp1->whoTo->flight_size,
3347 tp1->book_size,
3348 (uintptr_t) stcb,
3349 tp1->rec.data.TSN_seq);
3350 }
3351 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3352 sctp_flight_size_decrease(tp1);
3353 sctp_total_flight_decrease(stcb, tp1);
3354 }
3355 tp1->sent = SCTP_DATAGRAM_RESEND;
3356 } {
3357 /* audit code */
3358 unsigned int audit;
3359
3360 audit = 0;
3361 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3362 if (tp1->sent == SCTP_DATAGRAM_RESEND)
3363 audit++;
3364 }
3365 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3366 sctp_next) {
3367 if (tp1->sent == SCTP_DATAGRAM_RESEND)
3368 audit++;
3369 }
3370 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3371 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3372 audit, stcb->asoc.sent_queue_retran_cnt);
3373 #ifndef SCTP_AUDITING_ENABLED
3374 stcb->asoc.sent_queue_retran_cnt = audit;
3375 #endif
3376 }
3377 }
3378 }
3379 break;
3380 case SCTP_ASCONF:
3381 {
3382 struct sctp_tmit_chunk *asconf;
3383
3384 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3385 sctp_next) {
3386 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3387 break;
3388 }
3389 }
3390 if (asconf) {
3391 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3392 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3393 asconf->sent = SCTP_DATAGRAM_RESEND;
3394 asconf->snd_count--;
3395 }
3396 }
3397 break;
3398 case SCTP_INITIATION:
3399 /* resend the INIT */
3400 stcb->asoc.dropped_special_cnt++;
3401 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3402 /*
3403 * If we can get it in, in a few attempts we do
3404 * this, otherwise we let the timer fire.
3405 */
3406 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3407 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3408 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3409 }
3410 break;
3411 case SCTP_SELECTIVE_ACK:
3412 case SCTP_NR_SELECTIVE_ACK:
3413 /* resend the sack */
3414 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3415 break;
3416 case SCTP_HEARTBEAT_REQUEST:
3417 /* resend a demand HB */
3418 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3419 /*
3420 * Only retransmit if we KNOW we wont destroy the
3421 * tcb
3422 */
3423 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3424 }
3425 break;
3426 case SCTP_SHUTDOWN:
3427 sctp_send_shutdown(stcb, net);
3428 break;
3429 case SCTP_SHUTDOWN_ACK:
3430 sctp_send_shutdown_ack(stcb, net);
3431 break;
3432 case SCTP_COOKIE_ECHO:
3433 {
3434 struct sctp_tmit_chunk *cookie;
3435
3436 cookie = NULL;
3437 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3438 sctp_next) {
3439 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3440 break;
3441 }
3442 }
3443 if (cookie) {
3444 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3445 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3446 cookie->sent = SCTP_DATAGRAM_RESEND;
3447 sctp_stop_all_cookie_timers(stcb);
3448 }
3449 }
3450 break;
3451 case SCTP_COOKIE_ACK:
3452 sctp_send_cookie_ack(stcb);
3453 break;
3454 case SCTP_ASCONF_ACK:
3455 /* resend last asconf ack */
3456 sctp_send_asconf_ack(stcb);
3457 break;
3458 case SCTP_FORWARD_CUM_TSN:
3459 send_forward_tsn(stcb, &stcb->asoc);
3460 break;
3461 /* can't do anything with these */
3462 case SCTP_PACKET_DROPPED:
3463 case SCTP_INITIATION_ACK: /* this should not happen */
3464 case SCTP_HEARTBEAT_ACK:
3465 case SCTP_ABORT_ASSOCIATION:
3466 case SCTP_OPERATION_ERROR:
3467 case SCTP_SHUTDOWN_COMPLETE:
3468 case SCTP_ECN_ECHO:
3469 case SCTP_ECN_CWR:
3470 default:
3471 break;
3472 }
3473 return (0);
3474 }
3475
3476 void
3477 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3478 {
3479 uint32_t i;
3480 uint16_t temp;
3481
3482 /*
3483 * We set things to 0xffff since this is the last delivered sequence
3484 * and we will be sending in 0 after the reset.
3485 */
3486
3487 if (number_entries) {
3488 for (i = 0; i < number_entries; i++) {
3489 temp = ntohs(list[i]);
3490 if (temp >= stcb->asoc.streamincnt) {
3491 continue;
3492 }
3493 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3494 }
3495 } else {
3496 list = NULL;
3497 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3498 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3499 }
3500 }
3501 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3502 }
3503
3504 static void
3505 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3506 {
3507 uint32_t i;
3508 uint16_t temp;
3509
3510 if (number_entries > 0) {
3511 for (i = 0; i < number_entries; i++) {
3512 temp = ntohs(list[i]);
3513 if (temp >= stcb->asoc.streamoutcnt) {
3514 /* no such stream */
3515 continue;
3516 }
3517 stcb->asoc.strmout[temp].next_sequence_send = 0;
3518 }
3519 } else {
3520 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3521 stcb->asoc.strmout[i].next_sequence_send = 0;
3522 }
3523 }
3524 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3525 }
3526
3527
3528 struct sctp_stream_reset_out_request *
3529 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3530 {
3531 struct sctp_association *asoc;
3532 struct sctp_chunkhdr *ch;
3533 struct sctp_stream_reset_out_request *r;
3534 struct sctp_tmit_chunk *chk;
3535 int len, clen;
3536
3537 asoc = &stcb->asoc;
3538 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3539 asoc->stream_reset_outstanding = 0;
3540 return (NULL);
3541 }
3542 if (stcb->asoc.str_reset == NULL) {
3543 asoc->stream_reset_outstanding = 0;
3544 return (NULL);
3545 }
3546 chk = stcb->asoc.str_reset;
3547 if (chk->data == NULL) {
3548 return (NULL);
3549 }
3550 if (bchk) {
3551 /* he wants a copy of the chk pointer */
3552 *bchk = chk;
3553 }
3554 clen = chk->send_size;
3555 ch = mtod(chk->data, struct sctp_chunkhdr *);
3556 r = (struct sctp_stream_reset_out_request *)(ch + 1);
3557 if (ntohl(r->request_seq) == seq) {
3558 /* found it */
3559 return (r);
3560 }
3561 len = SCTP_SIZE32(ntohs(r->ph.param_length));
3562 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3563 /* move to the next one, there can only be a max of two */
3564 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3565 if (ntohl(r->request_seq) == seq) {
3566 return (r);
3567 }
3568 }
3569 /* that seq is not here */
3570 return (NULL);
3571 }
3572
3573 static void
3574 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3575 {
3576 struct sctp_association *asoc;
3577 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3578
3579 if (stcb->asoc.str_reset == NULL) {
3580 return;
3581 }
3582 asoc = &stcb->asoc;
3583
3584 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3585 TAILQ_REMOVE(&asoc->control_send_queue,
3586 chk,
3587 sctp_next);
3588 if (chk->data) {
3589 sctp_m_freem(chk->data);
3590 chk->data = NULL;
3591 }
3592 asoc->ctrl_queue_cnt--;
3593 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3594 /* sa_ignore NO_NULL_CHK */
3595 stcb->asoc.str_reset = NULL;
3596 }
3597
3598
3599 static int
3600 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3601 uint32_t seq, uint32_t action,
3602 struct sctp_stream_reset_response *respin)
3603 {
3604 uint16_t type;
3605 int lparm_len;
3606 struct sctp_association *asoc = &stcb->asoc;
3607 struct sctp_tmit_chunk *chk;
3608 struct sctp_stream_reset_out_request *srparam;
3609 uint32_t number_entries;
3610
3611 if (asoc->stream_reset_outstanding == 0) {
3612 /* duplicate */
3613 return (0);
3614 }
3615 if (seq == stcb->asoc.str_reset_seq_out) {
3616 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3617 if (srparam) {
3618 stcb->asoc.str_reset_seq_out++;
3619 type = ntohs(srparam->ph.param_type);
3620 lparm_len = ntohs(srparam->ph.param_length);
3621 if (type == SCTP_STR_RESET_OUT_REQUEST) {
3622 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3623 asoc->stream_reset_out_is_outstanding = 0;
3624 if (asoc->stream_reset_outstanding)
3625 asoc->stream_reset_outstanding--;
3626 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3627 /* do it */
3628 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3629 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3630 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3631 } else {
3632 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3633 }
3634 } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3635 /* Answered my request */
3636 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3637 if (asoc->stream_reset_outstanding)
3638 asoc->stream_reset_outstanding--;
3639 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3640 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3641 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3642 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3643 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3644 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3645 }
3646 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3647 /* Ok we now may have more streams */
3648 int num_stream;
3649
3650 num_stream = stcb->asoc.strm_pending_add_size;
3651 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3652 /* TSNH */
3653 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3654 }
3655 stcb->asoc.strm_pending_add_size = 0;
3656 if (asoc->stream_reset_outstanding)
3657 asoc->stream_reset_outstanding--;
3658 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3659 /* Put the new streams into effect */
3660 stcb->asoc.streamoutcnt += num_stream;
3661 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3662 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3663 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3664 SCTP_STREAM_CHANGE_DENIED);
3665 } else {
3666 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3667 SCTP_STREAM_CHANGE_FAILED);
3668 }
3669 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3670 if (asoc->stream_reset_outstanding)
3671 asoc->stream_reset_outstanding--;
3672 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3673 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3674 SCTP_STREAM_CHANGE_DENIED);
3675 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3676 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3677 SCTP_STREAM_CHANGE_FAILED);
3678 }
3679 } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3680 /**
3681 * a) Adopt the new in tsn.
3682 * b) reset the map
3683 * c) Adopt the new out-tsn
3684 */
3685 struct sctp_stream_reset_response_tsn *resp;
3686 struct sctp_forward_tsn_chunk fwdtsn;
3687 int abort_flag = 0;
3688
3689 if (respin == NULL) {
3690 /* huh ? */
3691 return (0);
3692 }
3693 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3694 return (0);
3695 }
3696 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3697 resp = (struct sctp_stream_reset_response_tsn *)respin;
3698 asoc->stream_reset_outstanding--;
3699 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3700 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3701 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3702 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3703 if (abort_flag) {
3704 return (1);
3705 }
3706 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3707 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3708 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3709 }
3710 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3711 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3712 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3713
3714 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3715 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3716
3717 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3718 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3719
3720 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3721 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3722 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3723 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3724 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3725 SCTP_ASSOC_RESET_DENIED);
3726 } else {
3727 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3728 SCTP_ASSOC_RESET_FAILED);
3729 }
3730 }
3731 /* get rid of the request and get the request flags */
3732 if (asoc->stream_reset_outstanding == 0) {
3733 sctp_clean_up_stream_reset(stcb);
3734 }
3735 }
3736 }
3737 return (0);
3738 }
3739
3740 static void
3741 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3742 struct sctp_tmit_chunk *chk,
3743 struct sctp_stream_reset_in_request *req, int trunc)
3744 {
3745 uint32_t seq;
3746 int len, i;
3747 int number_entries;
3748 uint16_t temp;
3749
3750 /*
3751 * peer wants me to send a str-reset to him for my outgoing seq's if
3752 * seq_in is right.
3753 */
3754 struct sctp_association *asoc = &stcb->asoc;
3755
3756 seq = ntohl(req->request_seq);
3757 if (asoc->str_reset_seq_in == seq) {
3758 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3759 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3760 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3761 } else if (trunc) {
3762 /* Can't do it, since they exceeded our buffer size */
3763 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3764 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3765 len = ntohs(req->ph.param_length);
3766 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3767 for (i = 0; i < number_entries; i++) {
3768 temp = ntohs(req->list_of_streams[i]);
3769 req->list_of_streams[i] = temp;
3770 }
3771 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3772 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3773 asoc->str_reset_seq_out,
3774 seq, (asoc->sending_seq - 1));
3775 asoc->stream_reset_out_is_outstanding = 1;
3776 asoc->str_reset = chk;
3777 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3778 stcb->asoc.stream_reset_outstanding++;
3779 } else {
3780 /* Can't do it, since we have sent one out */
3781 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3782 }
3783 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3784 asoc->str_reset_seq_in++;
3785 } else if (asoc->str_reset_seq_in - 1 == seq) {
3786 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3787 } else if (asoc->str_reset_seq_in - 2 == seq) {
3788 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3789 } else {
3790 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3791 }
3792 }
3793
3794 static int
3795 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3796 struct sctp_tmit_chunk *chk,
3797 struct sctp_stream_reset_tsn_request *req)
3798 {
3799 /* reset all in and out and update the tsn */
3800 /*
3801 * A) reset my str-seq's on in and out. B) Select a receive next,
3802 * and set cum-ack to it. Also process this selected number as a
3803 * fwd-tsn as well. C) set in the response my next sending seq.
3804 */
3805 struct sctp_forward_tsn_chunk fwdtsn;
3806 struct sctp_association *asoc = &stcb->asoc;
3807 int abort_flag = 0;
3808 uint32_t seq;
3809
3810 seq = ntohl(req->request_seq);
3811 if (asoc->str_reset_seq_in == seq) {
3812 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3813 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3814 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3815 } else {
3816 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3817 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3818 fwdtsn.ch.chunk_flags = 0;
3819 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3820 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3821 if (abort_flag) {
3822 return (1);
3823 }
3824 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3825 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3826 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3827 }
3828 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3829 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3830 memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3831 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3832 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3833 atomic_add_int(&asoc->sending_seq, 1);
3834 /* save off historical data for retrans */
3835 asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3836 asoc->last_sending_seq[0] = asoc->sending_seq;
3837 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3838 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3839 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3840 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3841 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3842 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3843 }
3844 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3845 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3846 asoc->str_reset_seq_in++;
3847 } else if (asoc->str_reset_seq_in - 1 == seq) {
3848 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3849 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3850 } else if (asoc->str_reset_seq_in - 2 == seq) {
3851 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3852 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3853 } else {
3854 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3855 }
3856 return (0);
3857 }
3858
3859 static void
3860 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3861 struct sctp_tmit_chunk *chk,
3862 struct sctp_stream_reset_out_request *req, int trunc)
3863 {
3864 uint32_t seq, tsn;
3865 int number_entries, len;
3866 struct sctp_association *asoc = &stcb->asoc;
3867
3868 seq = ntohl(req->request_seq);
3869
3870 /* now if its not a duplicate we process it */
3871 if (asoc->str_reset_seq_in == seq) {
3872 len = ntohs(req->ph.param_length);
3873 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3874 /*
3875 * the sender is resetting, handle the list issue.. we must
3876 * a) verify if we can do the reset, if so no problem b) If
3877 * we can't do the reset we must copy the request. c) queue
3878 * it, and setup the data in processor to trigger it off
3879 * when needed and dequeue all the queued data.
3880 */
3881 tsn = ntohl(req->send_reset_at_tsn);
3882
3883 /* move the reset action back one */
3884 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3885 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3886 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3887 } else if (trunc) {
3888 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3889 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3890 /* we can do it now */
3891 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3892 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3893 } else {
3894 /*
3895 * we must queue it up and thus wait for the TSN's
3896 * to arrive that are at or before tsn
3897 */
3898 struct sctp_stream_reset_list *liste;
3899 int siz;
3900
3901 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3902 SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3903 siz, SCTP_M_STRESET);
3904 if (liste == NULL) {
3905 /* gak out of memory */
3906 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3907 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3908 return;
3909 }
3910 liste->tsn = tsn;
3911 liste->number_entries = number_entries;
3912 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3913 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3914 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3915 }
3916 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3917 asoc->str_reset_seq_in++;
3918 } else if ((asoc->str_reset_seq_in - 1) == seq) {
3919 /*
3920 * one seq back, just echo back last action since my
3921 * response was lost.
3922 */
3923 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3924 } else if ((asoc->str_reset_seq_in - 2) == seq) {
3925 /*
3926 * two seq back, just echo back last action since my
3927 * response was lost.
3928 */
3929 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3930 } else {
3931 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3932 }
3933 }
3934
3935 static void
3936 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3937 struct sctp_stream_reset_add_strm *str_add)
3938 {
3939 /*
3940 * Peer is requesting to add more streams. If its within our
3941 * max-streams we will allow it.
3942 */
3943 uint32_t num_stream, i;
3944 uint32_t seq;
3945 struct sctp_association *asoc = &stcb->asoc;
3946 struct sctp_queued_to_read *ctl, *nctl;
3947
3948 /* Get the number. */
3949 seq = ntohl(str_add->request_seq);
3950 num_stream = ntohs(str_add->number_of_streams);
3951 /* Now what would be the new total? */
3952 if (asoc->str_reset_seq_in == seq) {
3953 num_stream += stcb->asoc.streamincnt;
3954 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3955 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3956 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3957 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3958 (num_stream > 0xffff)) {
3959 /* We must reject it they ask for to many */
3960 denied:
3961 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3962 } else {
3963 /* Ok, we can do that :-) */
3964 struct sctp_stream_in *oldstrm;
3965
3966 /* save off the old */
3967 oldstrm = stcb->asoc.strmin;
3968 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3969 (num_stream * sizeof(struct sctp_stream_in)),
3970 SCTP_M_STRMI);
3971 if (stcb->asoc.strmin == NULL) {
3972 stcb->asoc.strmin = oldstrm;
3973 goto denied;
3974 }
3975 /* copy off the old data */
3976 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3977 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3978 stcb->asoc.strmin[i].stream_no = i;
3979 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3980 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3981 /* now anything on those queues? */
3982 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3983 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3984 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3985 }
3986 }
3987 /* Init the new streams */
3988 for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3989 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3990 stcb->asoc.strmin[i].stream_no = i;
3991 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3992 stcb->asoc.strmin[i].delivery_started = 0;
3993 }
3994 SCTP_FREE(oldstrm, SCTP_M_STRMI);
3995 /* update the size */
3996 stcb->asoc.streamincnt = num_stream;
3997 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3998 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3999 }
4000 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4001 asoc->str_reset_seq_in++;
4002 } else if ((asoc->str_reset_seq_in - 1) == seq) {
4003 /*
4004 * one seq back, just echo back last action since my
4005 * response was lost.
4006 */
4007 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4008 } else if ((asoc->str_reset_seq_in - 2) == seq) {
4009 /*
4010 * two seq back, just echo back last action since my
4011 * response was lost.
4012 */
4013 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4014 } else {
4015 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4016
4017 }
4018 }
4019
4020 static void
4021 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4022 struct sctp_stream_reset_add_strm *str_add)
4023 {
4024 /*
4025 * Peer is requesting to add more streams. If its within our
4026 * max-streams we will allow it.
4027 */
4028 uint16_t num_stream;
4029 uint32_t seq;
4030 struct sctp_association *asoc = &stcb->asoc;
4031
4032 /* Get the number. */
4033 seq = ntohl(str_add->request_seq);
4034 num_stream = ntohs(str_add->number_of_streams);
4035 /* Now what would be the new total? */
4036 if (asoc->str_reset_seq_in == seq) {
4037 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4038 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4039 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4040 } else if (stcb->asoc.stream_reset_outstanding) {
4041 /* We must reject it we have something pending */
4042 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4043 } else {
4044 /* Ok, we can do that :-) */
4045 int mychk;
4046
4047 mychk = stcb->asoc.streamoutcnt;
4048 mychk += num_stream;
4049 if (mychk < 0x10000) {
4050 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4051 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4052 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4053 }
4054 } else {
4055 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4056 }
4057 }
4058 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4059 asoc->str_reset_seq_in++;
4060 } else if ((asoc->str_reset_seq_in - 1) == seq) {
4061 /*
4062 * one seq back, just echo back last action since my
4063 * response was lost.
4064 */
4065 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4066 } else if ((asoc->str_reset_seq_in - 2) == seq) {
4067 /*
4068 * two seq back, just echo back last action since my
4069 * response was lost.
4070 */
4071 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4072 } else {
4073 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4074 }
4075 }
4076
4077 #ifdef __GNUC__
4078 __attribute__((noinline))
4079 #endif
4080 static int
4081 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4082 struct sctp_chunkhdr *ch_req)
4083 {
4084 uint16_t remaining_length, param_len, ptype;
4085 struct sctp_paramhdr pstore;
4086 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4087 uint32_t seq = 0;
4088 int num_req = 0;
4089 int trunc = 0;
4090 struct sctp_tmit_chunk *chk;
4091 struct sctp_chunkhdr *ch;
4092 struct sctp_paramhdr *ph;
4093 int ret_code = 0;
4094 int num_param = 0;
4095
4096 /* now it may be a reset or a reset-response */
4097 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4098
4099 /* setup for adding the response */
4100 sctp_alloc_a_chunk(stcb, chk);
4101 if (chk == NULL) {
4102 return (ret_code);
4103 }
4104 chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4105 chk->rec.chunk_id.can_take_data = 0;
4106 chk->asoc = &stcb->asoc;
4107 chk->no_fr_allowed = 0;
4108 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4109 chk->book_size_scale = 0;
4110 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4111 if (chk->data == NULL) {
4112 strres_nochunk:
4113 if (chk->data) {
4114 sctp_m_freem(chk->data);
4115 chk->data = NULL;
4116 }
4117 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4118 return (ret_code);
4119 }
4120 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4121
4122 /* setup chunk parameters */
4123 chk->sent = SCTP_DATAGRAM_UNSENT;
4124 chk->snd_count = 0;
4125 chk->whoTo = NULL;
4126
4127 ch = mtod(chk->data, struct sctp_chunkhdr *);
4128 ch->chunk_type = SCTP_STREAM_RESET;
4129 ch->chunk_flags = 0;
4130 ch->chunk_length = htons(chk->send_size);
4131 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4132 offset += sizeof(struct sctp_chunkhdr);
4133 while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4134 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4135 if (ph == NULL) {
4136 /* TSNH */
4137 break;
4138 }
4139 param_len = ntohs(ph->param_length);
4140 if ((param_len > remaining_length) ||
4141 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4142 /* bad parameter length */
4143 break;
4144 }
4145 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4146 (uint8_t *) & cstore);
4147 if (ph == NULL) {
4148 /* TSNH */
4149 break;
4150 }
4151 ptype = ntohs(ph->param_type);
4152 num_param++;
4153 if (param_len > sizeof(cstore)) {
4154 trunc = 1;
4155 } else {
4156 trunc = 0;
4157 }
4158 if (num_param > SCTP_MAX_RESET_PARAMS) {
4159 /* hit the max of parameters already sorry.. */
4160 break;
4161 }
4162 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4163 struct sctp_stream_reset_out_request *req_out;
4164
4165 if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4166 break;
4167 }
4168 req_out = (struct sctp_stream_reset_out_request *)ph;
4169 num_req++;
4170 if (stcb->asoc.stream_reset_outstanding) {
4171 seq = ntohl(req_out->response_seq);
4172 if (seq == stcb->asoc.str_reset_seq_out) {
4173 /* implicit ack */
4174 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4175 }
4176 }
4177 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4178 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4179 struct sctp_stream_reset_add_strm *str_add;
4180
4181 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4182 break;
4183 }
4184 str_add = (struct sctp_stream_reset_add_strm *)ph;
4185 num_req++;
4186 sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4187 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4188 struct sctp_stream_reset_add_strm *str_add;
4189
4190 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4191 break;
4192 }
4193 str_add = (struct sctp_stream_reset_add_strm *)ph;
4194 num_req++;
4195 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4196 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4197 struct sctp_stream_reset_in_request *req_in;
4198
4199 num_req++;
4200 req_in = (struct sctp_stream_reset_in_request *)ph;
4201 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4202 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4203 struct sctp_stream_reset_tsn_request *req_tsn;
4204
4205 num_req++;
4206 req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4207 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4208 ret_code = 1;
4209 goto strres_nochunk;
4210 }
4211 /* no more */
4212 break;
4213 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4214 struct sctp_stream_reset_response *resp;
4215 uint32_t result;
4216
4217 if (param_len < sizeof(struct sctp_stream_reset_response)) {
4218 break;
4219 }
4220 resp = (struct sctp_stream_reset_response *)ph;
4221 seq = ntohl(resp->response_seq);
4222 result = ntohl(resp->result);
4223 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4224 ret_code = 1;
4225 goto strres_nochunk;
4226 }
4227 } else {
4228 break;
4229 }
4230 offset += SCTP_SIZE32(param_len);
4231 if (remaining_length >= SCTP_SIZE32(param_len)) {
4232 remaining_length -= SCTP_SIZE32(param_len);
4233 } else {
4234 remaining_length = 0;
4235 }
4236 }
4237 if (num_req == 0) {
4238 /* we have no response free the stuff */
4239 goto strres_nochunk;
4240 }
4241 /* ok we have a chunk to link in */
4242 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4243 chk,
4244 sctp_next);
4245 stcb->asoc.ctrl_queue_cnt++;
4246 return (ret_code);
4247 }
4248
4249 /*
4250 * Handle a router or endpoints report of a packet loss, there are two ways
4251 * to handle this, either we get the whole packet and must disect it
4252 * ourselves (possibly with truncation and or corruption) or it is a summary
4253 * from a middle box that did the disectting for us.
4254 */
4255 static void
4256 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4257 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4258 {
4259 uint32_t bottle_bw, on_queue;
4260 uint16_t trunc_len;
4261 unsigned int chlen;
4262 unsigned int at;
4263 struct sctp_chunk_desc desc;
4264 struct sctp_chunkhdr *ch;
4265
4266 chlen = ntohs(cp->ch.chunk_length);
4267 chlen -= sizeof(struct sctp_pktdrop_chunk);
4268 /* XXX possible chlen underflow */
4269 if (chlen == 0) {
4270 ch = NULL;
4271 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4272 SCTP_STAT_INCR(sctps_pdrpbwrpt);
4273 } else {
4274 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4275 chlen -= sizeof(struct sctphdr);
4276 /* XXX possible chlen underflow */
4277 memset(&desc, 0, sizeof(desc));
4278 }
4279 trunc_len = (uint16_t) ntohs(cp->trunc_len);
4280 if (trunc_len > limit) {
4281 trunc_len = limit;
4282 }
4283 /* now the chunks themselves */
4284 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4285 desc.chunk_type = ch->chunk_type;
4286 /* get amount we need to move */
4287 at = ntohs(ch->chunk_length);
4288 if (at < sizeof(struct sctp_chunkhdr)) {
4289 /* corrupt chunk, maybe at the end? */
4290 SCTP_STAT_INCR(sctps_pdrpcrupt);
4291 break;
4292 }
4293 if (trunc_len == 0) {
4294 /* we are supposed to have all of it */
4295 if (at > chlen) {
4296 /* corrupt skip it */
4297 SCTP_STAT_INCR(sctps_pdrpcrupt);
4298 break;
4299 }
4300 } else {
4301 /* is there enough of it left ? */
4302 if (desc.chunk_type == SCTP_DATA) {
4303 if (chlen < (sizeof(struct sctp_data_chunk) +
4304 sizeof(desc.data_bytes))) {
4305 break;
4306 }
4307 } else {
4308 if (chlen < sizeof(struct sctp_chunkhdr)) {
4309 break;
4310 }
4311 }
4312 }
4313 if (desc.chunk_type == SCTP_DATA) {
4314 /* can we get out the tsn? */
4315 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4316 SCTP_STAT_INCR(sctps_pdrpmbda);
4317
4318 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4319 /* yep */
4320 struct sctp_data_chunk *dcp;
4321 uint8_t *ddp;
4322 unsigned int iii;
4323
4324 dcp = (struct sctp_data_chunk *)ch;
4325 ddp = (uint8_t *) (dcp + 1);
4326 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4327 desc.data_bytes[iii] = ddp[iii];
4328 }
4329 desc.tsn_ifany = dcp->dp.tsn;
4330 } else {
4331 /* nope we are done. */
4332 SCTP_STAT_INCR(sctps_pdrpnedat);
4333 break;
4334 }
4335 } else {
4336 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4337 SCTP_STAT_INCR(sctps_pdrpmbct);
4338 }
4339
4340 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4341 SCTP_STAT_INCR(sctps_pdrppdbrk);
4342 break;
4343 }
4344 if (SCTP_SIZE32(at) > chlen) {
4345 break;
4346 }
4347 chlen -= SCTP_SIZE32(at);
4348 if (chlen < sizeof(struct sctp_chunkhdr)) {
4349 /* done, none left */
4350 break;
4351 }
4352 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4353 }
4354 /* Now update any rwnd --- possibly */
4355 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4356 /* From a peer, we get a rwnd report */
4357 uint32_t a_rwnd;
4358
4359 SCTP_STAT_INCR(sctps_pdrpfehos);
4360
4361 bottle_bw = ntohl(cp->bottle_bw);
4362 on_queue = ntohl(cp->current_onq);
4363 if (bottle_bw && on_queue) {
4364 /* a rwnd report is in here */
4365 if (bottle_bw > on_queue)
4366 a_rwnd = bottle_bw - on_queue;
4367 else
4368 a_rwnd = 0;
4369
4370 if (a_rwnd == 0)
4371 stcb->asoc.peers_rwnd = 0;
4372 else {
4373 if (a_rwnd > stcb->asoc.total_flight) {
4374 stcb->asoc.peers_rwnd =
4375 a_rwnd - stcb->asoc.total_flight;
4376 } else {
4377 stcb->asoc.peers_rwnd = 0;
4378 }
4379 if (stcb->asoc.peers_rwnd <
4380 stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4381 /* SWS sender side engages */
4382 stcb->asoc.peers_rwnd = 0;
4383 }
4384 }
4385 }
4386 } else {
4387 SCTP_STAT_INCR(sctps_pdrpfmbox);
4388 }
4389
4390 /* now middle boxes in sat networks get a cwnd bump */
4391 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4392 (stcb->asoc.sat_t3_loss_recovery == 0) &&
4393 (stcb->asoc.sat_network)) {
4394 /*
4395 * This is debateable but for sat networks it makes sense
4396 * Note if a T3 timer has went off, we will prohibit any
4397 * changes to cwnd until we exit the t3 loss recovery.
4398 */
4399 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4400 net, cp, &bottle_bw, &on_queue);
4401 }
4402 }
4403
4404 /*
4405 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4406 * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4407 * offset: offset into the mbuf chain to first chunkhdr - length: is the
4408 * length of the complete packet outputs: - length: modified to remaining
4409 * length after control processing - netp: modified to new sctp_nets after
4410 * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4411 * bad packet,...) otherwise return the tcb for this packet
4412 */
4413 #ifdef __GNUC__
4414 __attribute__((noinline))
4415 #endif
4416 static struct sctp_tcb *
4417 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4418 struct sockaddr *src, struct sockaddr *dst,
4419 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4420 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4421 uint8_t use_mflowid, uint32_t mflowid,
4422 uint32_t vrf_id, uint16_t port)
4423 {
4424 struct sctp_association *asoc;
4425 uint32_t vtag_in;
4426 int num_chunks = 0; /* number of control chunks processed */
4427 uint32_t chk_length;
4428 int ret;
4429 int abort_no_unlock = 0;
4430 int ecne_seen = 0;
4431
4432 /*
4433 * How big should this be, and should it be alloc'd? Lets try the
4434 * d-mtu-ceiling for now (2k) and that should hopefully work ...
4435 * until we get into jumbo grams and such..
4436 */
4437 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4438 struct sctp_tcb *locked_tcb = stcb;
4439 int got_auth = 0;
4440 uint32_t auth_offset = 0, auth_len = 0;
4441 int auth_skipped = 0;
4442 int asconf_cnt = 0;
4443
4444 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4445 struct socket *so;
4446
4447 #endif
4448
4449 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4450 iphlen, *offset, length, (void *)stcb);
4451
4452 /* validate chunk header length... */
4453 if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4454 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4455 ntohs(ch->chunk_length));
4456 if (locked_tcb) {
4457 SCTP_TCB_UNLOCK(locked_tcb);
4458 }
4459 return (NULL);
4460 }
4461 /*
4462 * validate the verification tag
4463 */
4464 vtag_in = ntohl(sh->v_tag);
4465
4466 if (locked_tcb) {
4467 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4468 }
4469 if (ch->chunk_type == SCTP_INITIATION) {
4470 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4471 ntohs(ch->chunk_length), vtag_in);
4472 if (vtag_in != 0) {
4473 /* protocol error- silently discard... */
4474 SCTP_STAT_INCR(sctps_badvtag);
4475 if (locked_tcb) {
4476 SCTP_TCB_UNLOCK(locked_tcb);
4477 }
4478 return (NULL);
4479 }
4480 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4481 /*
4482 * If there is no stcb, skip the AUTH chunk and process
4483 * later after a stcb is found (to validate the lookup was
4484 * valid.
4485 */
4486 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4487 (stcb == NULL) &&
4488 !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4489 /* save this chunk for later processing */
4490 auth_skipped = 1;
4491 auth_offset = *offset;
4492 auth_len = ntohs(ch->chunk_length);
4493
4494 /* (temporarily) move past this chunk */
4495 *offset += SCTP_SIZE32(auth_len);
4496 if (*offset >= length) {
4497 /* no more data left in the mbuf chain */
4498 *offset = length;
4499 if (locked_tcb) {
4500 SCTP_TCB_UNLOCK(locked_tcb);
4501 }
4502 return (NULL);
4503 }
4504 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4505 sizeof(struct sctp_chunkhdr), chunk_buf);
4506 }
4507 if (ch == NULL) {
4508 /* Help */
4509 *offset = length;
4510 if (locked_tcb) {
4511 SCTP_TCB_UNLOCK(locked_tcb);
4512 }
4513 return (NULL);
4514 }
4515 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4516 goto process_control_chunks;
4517 }
4518 /*
4519 * first check if it's an ASCONF with an unknown src addr we
4520 * need to look inside to find the association
4521 */
4522 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4523 struct sctp_chunkhdr *asconf_ch = ch;
4524 uint32_t asconf_offset = 0, asconf_len = 0;
4525
4526 /* inp's refcount may be reduced */
4527 SCTP_INP_INCR_REF(inp);
4528
4529 asconf_offset = *offset;
4530 do {
4531 asconf_len = ntohs(asconf_ch->chunk_length);
4532 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4533 break;
4534 stcb = sctp_findassociation_ep_asconf(m,
4535 *offset,
4536 dst,
4537 sh, &inp, netp, vrf_id);
4538 if (stcb != NULL)
4539 break;
4540 asconf_offset += SCTP_SIZE32(asconf_len);
4541 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4542 sizeof(struct sctp_chunkhdr), chunk_buf);
4543 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4544 if (stcb == NULL) {
4545 /*
4546 * reduce inp's refcount if not reduced in
4547 * sctp_findassociation_ep_asconf().
4548 */
4549 SCTP_INP_DECR_REF(inp);
4550 } else {
4551 locked_tcb = stcb;
4552 }
4553
4554 /* now go back and verify any auth chunk to be sure */
4555 if (auth_skipped && (stcb != NULL)) {
4556 struct sctp_auth_chunk *auth;
4557
4558 auth = (struct sctp_auth_chunk *)
4559 sctp_m_getptr(m, auth_offset,
4560 auth_len, chunk_buf);
4561 got_auth = 1;
4562 auth_skipped = 0;
4563 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4564 auth_offset)) {
4565 /* auth HMAC failed so dump it */
4566 *offset = length;
4567 if (locked_tcb) {
4568 SCTP_TCB_UNLOCK(locked_tcb);
4569 }
4570 return (NULL);
4571 } else {
4572 /* remaining chunks are HMAC checked */
4573 stcb->asoc.authenticated = 1;
4574 }
4575 }
4576 }
4577 if (stcb == NULL) {
4578 /* no association, so it's out of the blue... */
4579 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp,
4580 use_mflowid, mflowid,
4581 vrf_id, port);
4582 *offset = length;
4583 if (locked_tcb) {
4584 SCTP_TCB_UNLOCK(locked_tcb);
4585 }
4586 return (NULL);
4587 }
4588 asoc = &stcb->asoc;
4589 /* ABORT and SHUTDOWN can use either v_tag... */
4590 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4591 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4592 (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4593 /* Take the T-bit always into account. */
4594 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4595 (vtag_in == asoc->my_vtag)) ||
4596 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4597 (vtag_in == asoc->peer_vtag))) {
4598 /* this is valid */
4599 } else {
4600 /* drop this packet... */
4601 SCTP_STAT_INCR(sctps_badvtag);
4602 if (locked_tcb) {
4603 SCTP_TCB_UNLOCK(locked_tcb);
4604 }
4605 return (NULL);
4606 }
4607 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4608 if (vtag_in != asoc->my_vtag) {
4609 /*
4610 * this could be a stale SHUTDOWN-ACK or the
4611 * peer never got the SHUTDOWN-COMPLETE and
4612 * is still hung; we have started a new asoc
4613 * but it won't complete until the shutdown
4614 * is completed
4615 */
4616 if (locked_tcb) {
4617 SCTP_TCB_UNLOCK(locked_tcb);
4618 }
4619 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4620 sh, inp,
4621 use_mflowid, mflowid,
4622 vrf_id, port);
4623 return (NULL);
4624 }
4625 } else {
4626 /* for all other chunks, vtag must match */
4627 if (vtag_in != asoc->my_vtag) {
4628 /* invalid vtag... */
4629 SCTPDBG(SCTP_DEBUG_INPUT3,
4630 "invalid vtag: %xh, expect %xh\n",
4631 vtag_in, asoc->my_vtag);
4632 SCTP_STAT_INCR(sctps_badvtag);
4633 if (locked_tcb) {
4634 SCTP_TCB_UNLOCK(locked_tcb);
4635 }
4636 *offset = length;
4637 return (NULL);
4638 }
4639 }
4640 } /* end if !SCTP_COOKIE_ECHO */
4641 /*
4642 * process all control chunks...
4643 */
4644 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4645 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4646 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4647 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4648 /* implied cookie-ack.. we must have lost the ack */
4649 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4650 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4651 stcb->asoc.overall_error_count,
4652 0,
4653 SCTP_FROM_SCTP_INPUT,
4654 __LINE__);
4655 }
4656 stcb->asoc.overall_error_count = 0;
4657 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4658 *netp);
4659 }
4660 process_control_chunks:
4661 while (IS_SCTP_CONTROL(ch)) {
4662 /* validate chunk length */
4663 chk_length = ntohs(ch->chunk_length);
4664 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4665 ch->chunk_type, chk_length);
4666 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4667 if (chk_length < sizeof(*ch) ||
4668 (*offset + (int)chk_length) > length) {
4669 *offset = length;
4670 if (locked_tcb) {
4671 SCTP_TCB_UNLOCK(locked_tcb);
4672 }
4673 return (NULL);
4674 }
4675 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4676 /*
4677 * INIT-ACK only gets the init ack "header" portion only
4678 * because we don't have to process the peer's COOKIE. All
4679 * others get a complete chunk.
4680 */
4681 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4682 (ch->chunk_type == SCTP_INITIATION)) {
4683 /* get an init-ack chunk */
4684 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4685 sizeof(struct sctp_init_ack_chunk), chunk_buf);
4686 if (ch == NULL) {
4687 *offset = length;
4688 if (locked_tcb) {
4689 SCTP_TCB_UNLOCK(locked_tcb);
4690 }
4691 return (NULL);
4692 }
4693 } else {
4694 /* For cookies and all other chunks. */
4695 if (chk_length > sizeof(chunk_buf)) {
4696 /*
4697 * use just the size of the chunk buffer so
4698 * the front part of our chunks fit in
4699 * contiguous space up to the chunk buffer
4700 * size (508 bytes). For chunks that need to
4701 * get more than that they must use the
4702 * sctp_m_getptr() function or other means
4703 * (e.g. know how to parse mbuf chains).
4704 * Cookies do this already.
4705 */
4706 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4707 (sizeof(chunk_buf) - 4),
4708 chunk_buf);
4709 if (ch == NULL) {
4710 *offset = length;
4711 if (locked_tcb) {
4712 SCTP_TCB_UNLOCK(locked_tcb);
4713 }
4714 return (NULL);
4715 }
4716 } else {
4717 /* We can fit it all */
4718 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4719 chk_length, chunk_buf);
4720 if (ch == NULL) {
4721 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4722 *offset = length;
4723 if (locked_tcb) {
4724 SCTP_TCB_UNLOCK(locked_tcb);
4725 }
4726 return (NULL);
4727 }
4728 }
4729 }
4730 num_chunks++;
4731 /* Save off the last place we got a control from */
4732 if (stcb != NULL) {
4733 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4734 /*
4735 * allow last_control to be NULL if
4736 * ASCONF... ASCONF processing will find the
4737 * right net later
4738 */
4739 if ((netp != NULL) && (*netp != NULL))
4740 stcb->asoc.last_control_chunk_from = *netp;
4741 }
4742 }
4743 #ifdef SCTP_AUDITING_ENABLED
4744 sctp_audit_log(0xB0, ch->chunk_type);
4745 #endif
4746
4747 /* check to see if this chunk required auth, but isn't */
4748 if ((stcb != NULL) &&
4749 !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4750 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4751 !stcb->asoc.authenticated) {
4752 /* "silently" ignore */
4753 SCTP_STAT_INCR(sctps_recvauthmissing);
4754 goto next_chunk;
4755 }
4756 switch (ch->chunk_type) {
4757 case SCTP_INITIATION:
4758 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4759 /* The INIT chunk must be the only chunk. */
4760 if ((num_chunks > 1) ||
4761 (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4762 sctp_abort_association(inp, stcb, m, iphlen,
4763 src, dst, sh, NULL,
4764 use_mflowid, mflowid,
4765 vrf_id, port);
4766 *offset = length;
4767 return (NULL);
4768 }
4769 /* Honor our resource limit. */
4770 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4771 struct mbuf *op_err;
4772
4773 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
4774 sctp_abort_association(inp, stcb, m, iphlen,
4775 src, dst, sh, op_err,
4776 use_mflowid, mflowid,
4777 vrf_id, port);
4778 *offset = length;
4779 return (NULL);
4780 }
4781 sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4782 (struct sctp_init_chunk *)ch, inp,
4783 stcb, &abort_no_unlock,
4784 use_mflowid, mflowid,
4785 vrf_id, port);
4786 *offset = length;
4787 if ((!abort_no_unlock) && (locked_tcb)) {
4788 SCTP_TCB_UNLOCK(locked_tcb);
4789 }
4790 return (NULL);
4791 break;
4792 case SCTP_PAD_CHUNK:
4793 break;
4794 case SCTP_INITIATION_ACK:
4795 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4796 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4797 /* We are not interested anymore */
4798 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4799 ;
4800 } else {
4801 if (locked_tcb != stcb) {
4802 /* Very unlikely */
4803 SCTP_TCB_UNLOCK(locked_tcb);
4804 }
4805 *offset = length;
4806 if (stcb) {
4807 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4808 so = SCTP_INP_SO(inp);
4809 atomic_add_int(&stcb->asoc.refcnt, 1);
4810 SCTP_TCB_UNLOCK(stcb);
4811 SCTP_SOCKET_LOCK(so, 1);
4812 SCTP_TCB_LOCK(stcb);
4813 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4814 #endif
4815 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4816 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4817 SCTP_SOCKET_UNLOCK(so, 1);
4818 #endif
4819 }
4820 return (NULL);
4821 }
4822 }
4823 /* The INIT-ACK chunk must be the only chunk. */
4824 if ((num_chunks > 1) ||
4825 (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4826 *offset = length;
4827 if (locked_tcb) {
4828 SCTP_TCB_UNLOCK(locked_tcb);
4829 }
4830 return (NULL);
4831 }
4832 if ((netp) && (*netp)) {
4833 ret = sctp_handle_init_ack(m, iphlen, *offset,
4834 src, dst, sh,
4835 (struct sctp_init_ack_chunk *)ch,
4836 stcb, *netp,
4837 &abort_no_unlock,
4838 use_mflowid, mflowid,
4839 vrf_id);
4840 } else {
4841 ret = -1;
4842 }
4843 *offset = length;
4844 if (abort_no_unlock) {
4845 return (NULL);
4846 }
4847 /*
4848 * Special case, I must call the output routine to
4849 * get the cookie echoed
4850 */
4851 if ((stcb != NULL) && (ret == 0)) {
4852 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4853 }
4854 if (locked_tcb) {
4855 SCTP_TCB_UNLOCK(locked_tcb);
4856 }
4857 return (NULL);
4858 break;
4859 case SCTP_SELECTIVE_ACK:
4860 {
4861 struct sctp_sack_chunk *sack;
4862 int abort_now = 0;
4863 uint32_t a_rwnd, cum_ack;
4864 uint16_t num_seg, num_dup;
4865 uint8_t flags;
4866 int offset_seg, offset_dup;
4867
4868 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4869 SCTP_STAT_INCR(sctps_recvsacks);
4870 if (stcb == NULL) {
4871 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4872 break;
4873 }
4874 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4875 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4876 break;
4877 }
4878 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4879 /*-
4880 * If we have sent a shutdown-ack, we will pay no
4881 * attention to a sack sent in to us since
4882 * we don't care anymore.
4883 */
4884 break;
4885 }
4886 sack = (struct sctp_sack_chunk *)ch;
4887 flags = ch->chunk_flags;
4888 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4889 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4890 num_dup = ntohs(sack->sack.num_dup_tsns);
4891 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4892 if (sizeof(struct sctp_sack_chunk) +
4893 num_seg * sizeof(struct sctp_gap_ack_block) +
4894 num_dup * sizeof(uint32_t) != chk_length) {
4895 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4896 break;
4897 }
4898 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4899 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4900 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4901 cum_ack, num_seg, a_rwnd);
4902 stcb->asoc.seen_a_sack_this_pkt = 1;
4903 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4904 (num_seg == 0) &&
4905 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4906 (stcb->asoc.saw_sack_with_frags == 0) &&
4907 (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4908 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4909 ) {
4910 /*
4911 * We have a SIMPLE sack having no
4912 * prior segments and data on sent
4913 * queue to be acked.. Use the
4914 * faster path sack processing. We
4915 * also allow window update sacks
4916 * with no missing segments to go
4917 * this way too.
4918 */
4919 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4920 } else {
4921 if (netp && *netp)
4922 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4923 num_seg, 0, num_dup, &abort_now, flags,
4924 cum_ack, a_rwnd, ecne_seen);
4925 }
4926 if (abort_now) {
4927 /* ABORT signal from sack processing */
4928 *offset = length;
4929 return (NULL);
4930 }
4931 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4932 TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4933 (stcb->asoc.stream_queue_cnt == 0)) {
4934 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4935 }
4936 }
4937 break;
4938 /*
4939 * EY - nr_sack: If the received chunk is an
4940 * nr_sack chunk
4941 */
4942 case SCTP_NR_SELECTIVE_ACK:
4943 {
4944 struct sctp_nr_sack_chunk *nr_sack;
4945 int abort_now = 0;
4946 uint32_t a_rwnd, cum_ack;
4947 uint16_t num_seg, num_nr_seg, num_dup;
4948 uint8_t flags;
4949 int offset_seg, offset_dup;
4950
4951 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4952 SCTP_STAT_INCR(sctps_recvsacks);
4953 if (stcb == NULL) {
4954 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4955 break;
4956 }
4957 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
4958 (stcb->asoc.peer_supports_nr_sack == 0)) {
4959 goto unknown_chunk;
4960 }
4961 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4962 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4963 break;
4964 }
4965 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4966 /*-
4967 * If we have sent a shutdown-ack, we will pay no
4968 * attention to a sack sent in to us since
4969 * we don't care anymore.
4970 */
4971 break;
4972 }
4973 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4974 flags = ch->chunk_flags;
4975 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4976 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4977 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4978 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4979 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4980 if (sizeof(struct sctp_nr_sack_chunk) +
4981 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4982 num_dup * sizeof(uint32_t) != chk_length) {
4983 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4984 break;
4985 }
4986 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4987 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4988 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4989 cum_ack, num_seg, a_rwnd);
4990 stcb->asoc.seen_a_sack_this_pkt = 1;
4991 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4992 (num_seg == 0) && (num_nr_seg == 0) &&
4993 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4994 (stcb->asoc.saw_sack_with_frags == 0) &&
4995 (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4996 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4997 /*
4998 * We have a SIMPLE sack having no
4999 * prior segments and data on sent
5000 * queue to be acked. Use the faster
5001 * path sack processing. We also
5002 * allow window update sacks with no
5003 * missing segments to go this way
5004 * too.
5005 */
5006 sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5007 &abort_now, ecne_seen);
5008 } else {
5009 if (netp && *netp)
5010 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5011 num_seg, num_nr_seg, num_dup, &abort_now, flags,
5012 cum_ack, a_rwnd, ecne_seen);
5013 }
5014 if (abort_now) {
5015 /* ABORT signal from sack processing */
5016 *offset = length;
5017 return (NULL);
5018 }
5019 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5020 TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5021 (stcb->asoc.stream_queue_cnt == 0)) {
5022 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5023 }
5024 }
5025 break;
5026
5027 case SCTP_HEARTBEAT_REQUEST:
5028 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5029 if ((stcb) && netp && *netp) {
5030 SCTP_STAT_INCR(sctps_recvheartbeat);
5031 sctp_send_heartbeat_ack(stcb, m, *offset,
5032 chk_length, *netp);
5033
5034 /* He's alive so give him credit */
5035 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5036 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5037 stcb->asoc.overall_error_count,
5038 0,
5039 SCTP_FROM_SCTP_INPUT,
5040 __LINE__);
5041 }
5042 stcb->asoc.overall_error_count = 0;
5043 }
5044 break;
5045 case SCTP_HEARTBEAT_ACK:
5046 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5047 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5048 /* Its not ours */
5049 *offset = length;
5050 if (locked_tcb) {
5051 SCTP_TCB_UNLOCK(locked_tcb);
5052 }
5053 return (NULL);
5054 }
5055 /* He's alive so give him credit */
5056 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5057 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5058 stcb->asoc.overall_error_count,
5059 0,
5060 SCTP_FROM_SCTP_INPUT,
5061 __LINE__);
5062 }
5063 stcb->asoc.overall_error_count = 0;
5064 SCTP_STAT_INCR(sctps_recvheartbeatack);
5065 if (netp && *netp)
5066 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5067 stcb, *netp);
5068 break;
5069 case SCTP_ABORT_ASSOCIATION:
5070 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5071 (void *)stcb);
5072 if ((stcb) && netp && *netp)
5073 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5074 stcb, *netp);
5075 *offset = length;
5076 return (NULL);
5077 break;
5078 case SCTP_SHUTDOWN:
5079 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5080 (void *)stcb);
5081 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5082 *offset = length;
5083 if (locked_tcb) {
5084 SCTP_TCB_UNLOCK(locked_tcb);
5085 }
5086 return (NULL);
5087 }
5088 if (netp && *netp) {
5089 int abort_flag = 0;
5090
5091 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5092 stcb, *netp, &abort_flag);
5093 if (abort_flag) {
5094 *offset = length;
5095 return (NULL);
5096 }
5097 }
5098 break;
5099 case SCTP_SHUTDOWN_ACK:
5100 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5101 if ((stcb) && (netp) && (*netp))
5102 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5103 *offset = length;
5104 return (NULL);
5105 break;
5106
5107 case SCTP_OPERATION_ERROR:
5108 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5109 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5110 *offset = length;
5111 return (NULL);
5112 }
5113 break;
5114 case SCTP_COOKIE_ECHO:
5115 SCTPDBG(SCTP_DEBUG_INPUT3,
5116 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5117 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5118 ;
5119 } else {
5120 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5121 /* We are not interested anymore */
5122 abend:
5123 if (stcb) {
5124 SCTP_TCB_UNLOCK(stcb);
5125 }
5126 *offset = length;
5127 return (NULL);
5128 }
5129 }
5130 /*
5131 * First are we accepting? We do this again here
5132 * since it is possible that a previous endpoint WAS
5133 * listening responded to a INIT-ACK and then
5134 * closed. We opened and bound.. and are now no
5135 * longer listening.
5136 */
5137
5138 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5139 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5140 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5141 struct mbuf *op_err;
5142
5143 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
5144 sctp_abort_association(inp, stcb, m, iphlen,
5145 src, dst, sh, op_err,
5146 use_mflowid, mflowid,
5147 vrf_id, port);
5148 }
5149 *offset = length;
5150 return (NULL);
5151 } else {
5152 struct mbuf *ret_buf;
5153 struct sctp_inpcb *linp;
5154
5155 if (stcb) {
5156 linp = NULL;
5157 } else {
5158 linp = inp;
5159 }
5160
5161 if (linp) {
5162 SCTP_ASOC_CREATE_LOCK(linp);
5163 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5164 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5165 SCTP_ASOC_CREATE_UNLOCK(linp);
5166 goto abend;
5167 }
5168 }
5169 if (netp) {
5170 ret_buf =
5171 sctp_handle_cookie_echo(m, iphlen,
5172 *offset,
5173 src, dst,
5174 sh,
5175 (struct sctp_cookie_echo_chunk *)ch,
5176 &inp, &stcb, netp,
5177 auth_skipped,
5178 auth_offset,
5179 auth_len,
5180 &locked_tcb,
5181 use_mflowid,
5182 mflowid,
5183 vrf_id,
5184 port);
5185 } else {
5186 ret_buf = NULL;
5187 }
5188 if (linp) {
5189 SCTP_ASOC_CREATE_UNLOCK(linp);
5190 }
5191 if (ret_buf == NULL) {
5192 if (locked_tcb) {
5193 SCTP_TCB_UNLOCK(locked_tcb);
5194 }
5195 SCTPDBG(SCTP_DEBUG_INPUT3,
5196 "GAK, null buffer\n");
5197 *offset = length;
5198 return (NULL);
5199 }
5200 /* if AUTH skipped, see if it verified... */
5201 if (auth_skipped) {
5202 got_auth = 1;
5203 auth_skipped = 0;
5204 }
5205 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5206 /*
5207 * Restart the timer if we have
5208 * pending data
5209 */
5210 struct sctp_tmit_chunk *chk;
5211
5212 chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5213 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5214 }
5215 }
5216 break;
5217 case SCTP_COOKIE_ACK:
5218 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5219 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5220 if (locked_tcb) {
5221 SCTP_TCB_UNLOCK(locked_tcb);
5222 }
5223 return (NULL);
5224 }
5225 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5226 /* We are not interested anymore */
5227 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5228 ;
5229 } else if (stcb) {
5230 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5231 so = SCTP_INP_SO(inp);
5232 atomic_add_int(&stcb->asoc.refcnt, 1);
5233 SCTP_TCB_UNLOCK(stcb);
5234 SCTP_SOCKET_LOCK(so, 1);
5235 SCTP_TCB_LOCK(stcb);
5236 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5237 #endif
5238 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5239 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5240 SCTP_SOCKET_UNLOCK(so, 1);
5241 #endif
5242 *offset = length;
5243 return (NULL);
5244 }
5245 }
5246 /* He's alive so give him credit */
5247 if ((stcb) && netp && *netp) {
5248 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5249 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5250 stcb->asoc.overall_error_count,
5251 0,
5252 SCTP_FROM_SCTP_INPUT,
5253 __LINE__);
5254 }
5255 stcb->asoc.overall_error_count = 0;
5256 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5257 }
5258 break;
5259 case SCTP_ECN_ECHO:
5260 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5261 /* He's alive so give him credit */
5262 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5263 /* Its not ours */
5264 if (locked_tcb) {
5265 SCTP_TCB_UNLOCK(locked_tcb);
5266 }
5267 *offset = length;
5268 return (NULL);
5269 }
5270 if (stcb) {
5271 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5272 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5273 stcb->asoc.overall_error_count,
5274 0,
5275 SCTP_FROM_SCTP_INPUT,
5276 __LINE__);
5277 }
5278 stcb->asoc.overall_error_count = 0;
5279 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5280 stcb);
5281 ecne_seen = 1;
5282 }
5283 break;
5284 case SCTP_ECN_CWR:
5285 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5286 /* He's alive so give him credit */
5287 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5288 /* Its not ours */
5289 if (locked_tcb) {
5290 SCTP_TCB_UNLOCK(locked_tcb);
5291 }
5292 *offset = length;
5293 return (NULL);
5294 }
5295 if (stcb) {
5296 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5297 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5298 stcb->asoc.overall_error_count,
5299 0,
5300 SCTP_FROM_SCTP_INPUT,
5301 __LINE__);
5302 }
5303 stcb->asoc.overall_error_count = 0;
5304 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5305 }
5306 break;
5307 case SCTP_SHUTDOWN_COMPLETE:
5308 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5309 /* must be first and only chunk */
5310 if ((num_chunks > 1) ||
5311 (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5312 *offset = length;
5313 if (locked_tcb) {
5314 SCTP_TCB_UNLOCK(locked_tcb);
5315 }
5316 return (NULL);
5317 }
5318 if ((stcb) && netp && *netp) {
5319 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5320 stcb, *netp);
5321 }
5322 *offset = length;
5323 return (NULL);
5324 break;
5325 case SCTP_ASCONF:
5326 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5327 /* He's alive so give him credit */
5328 if (stcb) {
5329 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5330 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5331 stcb->asoc.overall_error_count,
5332 0,
5333 SCTP_FROM_SCTP_INPUT,
5334 __LINE__);
5335 }
5336 stcb->asoc.overall_error_count = 0;
5337 sctp_handle_asconf(m, *offset, src,
5338 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5339 asconf_cnt++;
5340 }
5341 break;
5342 case SCTP_ASCONF_ACK:
5343 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5344 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5345 /* Its not ours */
5346 if (locked_tcb) {
5347 SCTP_TCB_UNLOCK(locked_tcb);
5348 }
5349 *offset = length;
5350 return (NULL);
5351 }
5352 if ((stcb) && netp && *netp) {
5353 /* He's alive so give him credit */
5354 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5355 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5356 stcb->asoc.overall_error_count,
5357 0,
5358 SCTP_FROM_SCTP_INPUT,
5359 __LINE__);
5360 }
5361 stcb->asoc.overall_error_count = 0;
5362 sctp_handle_asconf_ack(m, *offset,
5363 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5364 if (abort_no_unlock)
5365 return (NULL);
5366 }
5367 break;
5368 case SCTP_FORWARD_CUM_TSN:
5369 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5370 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5371 /* Its not ours */
5372 if (locked_tcb) {
5373 SCTP_TCB_UNLOCK(locked_tcb);
5374 }
5375 *offset = length;
5376 return (NULL);
5377 }
5378 /* He's alive so give him credit */
5379 if (stcb) {
5380 int abort_flag = 0;
5381
5382 stcb->asoc.overall_error_count = 0;
5383 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5384 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5385 stcb->asoc.overall_error_count,
5386 0,
5387 SCTP_FROM_SCTP_INPUT,
5388 __LINE__);
5389 }
5390 *fwd_tsn_seen = 1;
5391 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5392 /* We are not interested anymore */
5393 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5394 so = SCTP_INP_SO(inp);
5395 atomic_add_int(&stcb->asoc.refcnt, 1);
5396 SCTP_TCB_UNLOCK(stcb);
5397 SCTP_SOCKET_LOCK(so, 1);
5398 SCTP_TCB_LOCK(stcb);
5399 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5400 #endif
5401 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5402 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5403 SCTP_SOCKET_UNLOCK(so, 1);
5404 #endif
5405 *offset = length;
5406 return (NULL);
5407 }
5408 sctp_handle_forward_tsn(stcb,
5409 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5410 if (abort_flag) {
5411 *offset = length;
5412 return (NULL);
5413 } else {
5414 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5415 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5416 stcb->asoc.overall_error_count,
5417 0,
5418 SCTP_FROM_SCTP_INPUT,
5419 __LINE__);
5420 }
5421 stcb->asoc.overall_error_count = 0;
5422 }
5423
5424 }
5425 break;
5426 case SCTP_STREAM_RESET:
5427 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5428 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5429 /* Its not ours */
5430 if (locked_tcb) {
5431 SCTP_TCB_UNLOCK(locked_tcb);
5432 }
5433 *offset = length;
5434 return (NULL);
5435 }
5436 if (stcb->asoc.peer_supports_strreset == 0) {
5437 /*
5438 * hmm, peer should have announced this, but
5439 * we will turn it on since he is sending us
5440 * a stream reset.
5441 */
5442 stcb->asoc.peer_supports_strreset = 1;
5443 }
5444 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5445 /* stop processing */
5446 *offset = length;
5447 return (NULL);
5448 }
5449 break;
5450 case SCTP_PACKET_DROPPED:
5451 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5452 /* re-get it all please */
5453 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5454 /* Its not ours */
5455 if (locked_tcb) {
5456 SCTP_TCB_UNLOCK(locked_tcb);
5457 }
5458 *offset = length;
5459 return (NULL);
5460 }
5461 if (ch && (stcb) && netp && (*netp)) {
5462 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5463 stcb, *netp,
5464 min(chk_length, (sizeof(chunk_buf) - 4)));
5465
5466 }
5467 break;
5468
5469 case SCTP_AUTHENTICATION:
5470 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5471 if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5472 goto unknown_chunk;
5473
5474 if (stcb == NULL) {
5475 /* save the first AUTH for later processing */
5476 if (auth_skipped == 0) {
5477 auth_offset = *offset;
5478 auth_len = chk_length;
5479 auth_skipped = 1;
5480 }
5481 /* skip this chunk (temporarily) */
5482 goto next_chunk;
5483 }
5484 if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5485 (chk_length > (sizeof(struct sctp_auth_chunk) +
5486 SCTP_AUTH_DIGEST_LEN_MAX))) {
5487 /* Its not ours */
5488 if (locked_tcb) {
5489 SCTP_TCB_UNLOCK(locked_tcb);
5490 }
5491 *offset = length;
5492 return (NULL);
5493 }
5494 if (got_auth == 1) {
5495 /* skip this chunk... it's already auth'd */
5496 goto next_chunk;
5497 }
5498 got_auth = 1;
5499 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5500 m, *offset)) {
5501 /* auth HMAC failed so dump the packet */
5502 *offset = length;
5503 return (stcb);
5504 } else {
5505 /* remaining chunks are HMAC checked */
5506 stcb->asoc.authenticated = 1;
5507 }
5508 break;
5509
5510 default:
5511 unknown_chunk:
5512 /* it's an unknown chunk! */
5513 if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5514 struct mbuf *mm;
5515 struct sctp_paramhdr *phd;
5516
5517 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5518 0, M_NOWAIT, 1, MT_DATA);
5519 if (mm) {
5520 phd = mtod(mm, struct sctp_paramhdr *);
5521 /*
5522 * We cheat and use param type since
5523 * we did not bother to define a
5524 * error cause struct. They are the
5525 * same basic format with different
5526 * names.
5527 */
5528 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5529 phd->param_length = htons(chk_length + sizeof(*phd));
5530 SCTP_BUF_LEN(mm) = sizeof(*phd);
5531 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT);
5532 if (SCTP_BUF_NEXT(mm)) {
5533 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) {
5534 sctp_m_freem(mm);
5535 } else {
5536 #ifdef SCTP_MBUF_LOGGING
5537 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5538 struct mbuf *mat;
5539
5540 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) {
5541 if (SCTP_BUF_IS_EXTENDED(mat)) {
5542 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5543 }
5544 }
5545 }
5546 #endif
5547 sctp_queue_op_err(stcb, mm);
5548 }
5549 } else {
5550 sctp_m_freem(mm);
5551 }
5552 }
5553 }
5554 if ((ch->chunk_type & 0x80) == 0) {
5555 /* discard this packet */
5556 *offset = length;
5557 return (stcb);
5558 } /* else skip this bad chunk and continue... */
5559 break;
5560 } /* switch (ch->chunk_type) */
5561
5562
5563 next_chunk:
5564 /* get the next chunk */
5565 *offset += SCTP_SIZE32(chk_length);
5566 if (*offset >= length) {
5567 /* no more data left in the mbuf chain */
5568 break;
5569 }
5570 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5571 sizeof(struct sctp_chunkhdr), chunk_buf);
5572 if (ch == NULL) {
5573 if (locked_tcb) {
5574 SCTP_TCB_UNLOCK(locked_tcb);
5575 }
5576 *offset = length;
5577 return (NULL);
5578 }
5579 } /* while */
5580
5581 if (asconf_cnt > 0 && stcb != NULL) {
5582 sctp_send_asconf_ack(stcb);
5583 }
5584 return (stcb);
5585 }
5586
5587
5588 #ifdef INVARIANTS
5589 #ifdef __GNUC__
5590 __attribute__((noinline))
5591 #endif
5592 void
5593 sctp_validate_no_locks(struct sctp_inpcb *inp)
5594 {
5595 struct sctp_tcb *lstcb;
5596
5597 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5598 if (mtx_owned(&lstcb->tcb_mtx)) {
5599 panic("Own lock on stcb at return from input");
5600 }
5601 }
5602 if (mtx_owned(&inp->inp_create_mtx)) {
5603 panic("Own create lock on inp");
5604 }
5605 if (mtx_owned(&inp->inp_mtx)) {
5606 panic("Own inp lock on inp");
5607 }
5608 }
5609
5610 #endif
5611
5612 /*
5613 * common input chunk processing (v4 and v6)
5614 */
5615 void
5616 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5617 struct sockaddr *src, struct sockaddr *dst,
5618 struct sctphdr *sh, struct sctp_chunkhdr *ch,
5619 #if !defined(SCTP_WITH_NO_CSUM)
5620 uint8_t compute_crc,
5621 #endif
5622 uint8_t ecn_bits,
5623 uint8_t use_mflowid, uint32_t mflowid,
5624 uint32_t vrf_id, uint16_t port)
5625 {
5626 uint32_t high_tsn;
5627 int fwd_tsn_seen = 0, data_processed = 0;
5628 struct mbuf *m = *mm;
5629 int un_sent;
5630 int cnt_ctrl_ready = 0;
5631 struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5632 struct sctp_tcb *stcb = NULL;
5633 struct sctp_nets *net = NULL;
5634
5635 SCTP_STAT_INCR(sctps_recvdatagrams);
5636 #ifdef SCTP_AUDITING_ENABLED
5637 sctp_audit_log(0xE0, 1);
5638 sctp_auditing(0, inp, stcb, net);
5639 #endif
5640 #if !defined(SCTP_WITH_NO_CSUM)
5641 if (compute_crc != 0) {
5642 uint32_t check, calc_check;
5643
5644 check = sh->checksum;
5645 sh->checksum = 0;
5646 calc_check = sctp_calculate_cksum(m, iphlen);
5647 sh->checksum = check;
5648 if (calc_check != check) {
5649 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n",
5650 calc_check, check, (void *)m, length, iphlen);
5651 stcb = sctp_findassociation_addr(m, offset, src, dst,
5652 sh, ch, &inp, &net, vrf_id);
5653 if ((net != NULL) && (port != 0)) {
5654 if (net->port == 0) {
5655 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5656 }
5657 net->port = port;
5658 }
5659 if ((net != NULL) && (use_mflowid != 0)) {
5660 net->flowid = mflowid;
5661 #ifdef INVARIANTS
5662 net->flowidset = 1;
5663 #endif
5664 }
5665 if ((inp != NULL) && (stcb != NULL)) {
5666 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5667 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5668 } else if ((inp != NULL) && (stcb == NULL)) {
5669 inp_decr = inp;
5670 }
5671 SCTP_STAT_INCR(sctps_badsum);
5672 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5673 goto out;
5674 }
5675 }
5676 #endif
5677 /* Destination port of 0 is illegal, based on RFC4960. */
5678 if (sh->dest_port == 0) {
5679 SCTP_STAT_INCR(sctps_hdrops);
5680 goto out;
5681 }
5682 stcb = sctp_findassociation_addr(m, offset, src, dst,
5683 sh, ch, &inp, &net, vrf_id);
5684 if ((net != NULL) && (port != 0)) {
5685 if (net->port == 0) {
5686 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5687 }
5688 net->port = port;
5689 }
5690 if ((net != NULL) && (use_mflowid != 0)) {
5691 net->flowid = mflowid;
5692 #ifdef INVARIANTS
5693 net->flowidset = 1;
5694 #endif
5695 }
5696 if (inp == NULL) {
5697 SCTP_STAT_INCR(sctps_noport);
5698 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5699 goto out;
5700 }
5701 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5702 sctp_send_shutdown_complete2(src, dst, sh,
5703 use_mflowid, mflowid,
5704 vrf_id, port);
5705 goto out;
5706 }
5707 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5708 goto out;
5709 }
5710 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5711 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5712 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5713 (ch->chunk_type != SCTP_INIT))) {
5714 sctp_send_abort(m, iphlen, src, dst,
5715 sh, 0, NULL,
5716 use_mflowid, mflowid,
5717 vrf_id, port);
5718 }
5719 }
5720 goto out;
5721 } else if (stcb == NULL) {
5722 inp_decr = inp;
5723 }
5724 #ifdef IPSEC
5725 /*-
5726 * I very much doubt any of the IPSEC stuff will work but I have no
5727 * idea, so I will leave it in place.
5728 */
5729 if (inp != NULL) {
5730 switch (dst->sa_family) {
5731 #ifdef INET
5732 case AF_INET:
5733 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5734 IPSECSTAT_INC(ips_in_polvio);
5735 SCTP_STAT_INCR(sctps_hdrops);
5736 goto out;
5737 }
5738 break;
5739 #endif
5740 #ifdef INET6
5741 case AF_INET6:
5742 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5743 IPSEC6STAT_INC(ips_in_polvio);
5744 SCTP_STAT_INCR(sctps_hdrops);
5745 goto out;
5746 }
5747 break;
5748 #endif
5749 default:
5750 break;
5751 }
5752 }
5753 #endif
5754 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5755 (void *)m, iphlen, offset, length, (void *)stcb);
5756 if (stcb) {
5757 /* always clear this before beginning a packet */
5758 stcb->asoc.authenticated = 0;
5759 stcb->asoc.seen_a_sack_this_pkt = 0;
5760 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5761 (void *)stcb, stcb->asoc.state);
5762
5763 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5764 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5765 /*-
5766 * If we hit here, we had a ref count
5767 * up when the assoc was aborted and the
5768 * timer is clearing out the assoc, we should
5769 * NOT respond to any packet.. its OOTB.
5770 */
5771 SCTP_TCB_UNLOCK(stcb);
5772 stcb = NULL;
5773 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
5774 use_mflowid, mflowid,
5775 vrf_id, port);
5776 goto out;
5777 }
5778 }
5779 if (IS_SCTP_CONTROL(ch)) {
5780 /* process the control portion of the SCTP packet */
5781 /* sa_ignore NO_NULL_CHK */
5782 stcb = sctp_process_control(m, iphlen, &offset, length,
5783 src, dst, sh, ch,
5784 inp, stcb, &net, &fwd_tsn_seen,
5785 use_mflowid, mflowid,
5786 vrf_id, port);
5787 if (stcb) {
5788 /*
5789 * This covers us if the cookie-echo was there and
5790 * it changes our INP.
5791 */
5792 inp = stcb->sctp_ep;
5793 if ((net) && (port)) {
5794 if (net->port == 0) {
5795 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5796 }
5797 net->port = port;
5798 }
5799 }
5800 } else {
5801 /*
5802 * no control chunks, so pre-process DATA chunks (these
5803 * checks are taken care of by control processing)
5804 */
5805
5806 /*
5807 * if DATA only packet, and auth is required, then punt...
5808 * can't have authenticated without any AUTH (control)
5809 * chunks
5810 */
5811 if ((stcb != NULL) &&
5812 !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5813 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5814 /* "silently" ignore */
5815 SCTP_STAT_INCR(sctps_recvauthmissing);
5816 goto out;
5817 }
5818 if (stcb == NULL) {
5819 /* out of the blue DATA chunk */
5820 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
5821 use_mflowid, mflowid,
5822 vrf_id, port);
5823 goto out;
5824 }
5825 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5826 /* v_tag mismatch! */
5827 SCTP_STAT_INCR(sctps_badvtag);
5828 goto out;
5829 }
5830 }
5831
5832 if (stcb == NULL) {
5833 /*
5834 * no valid TCB for this packet, or we found it's a bad
5835 * packet while processing control, or we're done with this
5836 * packet (done or skip rest of data), so we drop it...
5837 */
5838 goto out;
5839 }
5840 /*
5841 * DATA chunk processing
5842 */
5843 /* plow through the data chunks while length > offset */
5844
5845 /*
5846 * Rest should be DATA only. Check authentication state if AUTH for
5847 * DATA is required.
5848 */
5849 if ((length > offset) &&
5850 (stcb != NULL) &&
5851 !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5852 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5853 !stcb->asoc.authenticated) {
5854 /* "silently" ignore */
5855 SCTP_STAT_INCR(sctps_recvauthmissing);
5856 SCTPDBG(SCTP_DEBUG_AUTH1,
5857 "Data chunk requires AUTH, skipped\n");
5858 goto trigger_send;
5859 }
5860 if (length > offset) {
5861 int retval;
5862
5863 /*
5864 * First check to make sure our state is correct. We would
5865 * not get here unless we really did have a tag, so we don't
5866 * abort if this happens, just dump the chunk silently.
5867 */
5868 switch (SCTP_GET_STATE(&stcb->asoc)) {
5869 case SCTP_STATE_COOKIE_ECHOED:
5870 /*
5871 * we consider data with valid tags in this state
5872 * shows us the cookie-ack was lost. Imply it was
5873 * there.
5874 */
5875 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5876 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5877 stcb->asoc.overall_error_count,
5878 0,
5879 SCTP_FROM_SCTP_INPUT,
5880 __LINE__);
5881 }
5882 stcb->asoc.overall_error_count = 0;
5883 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5884 break;
5885 case SCTP_STATE_COOKIE_WAIT:
5886 /*
5887 * We consider OOTB any data sent during asoc setup.
5888 */
5889 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
5890 use_mflowid, mflowid,
5891 vrf_id, port);
5892 goto out;
5893 /* sa_ignore NOTREACHED */
5894 break;
5895 case SCTP_STATE_EMPTY: /* should not happen */
5896 case SCTP_STATE_INUSE: /* should not happen */
5897 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */
5898 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5899 default:
5900 goto out;
5901 /* sa_ignore NOTREACHED */
5902 break;
5903 case SCTP_STATE_OPEN:
5904 case SCTP_STATE_SHUTDOWN_SENT:
5905 break;
5906 }
5907 /* plow through the data chunks while length > offset */
5908 retval = sctp_process_data(mm, iphlen, &offset, length,
5909 src, dst, sh,
5910 inp, stcb, net, &high_tsn,
5911 use_mflowid, mflowid,
5912 vrf_id, port);
5913 if (retval == 2) {
5914 /*
5915 * The association aborted, NO UNLOCK needed since
5916 * the association is destroyed.
5917 */
5918 stcb = NULL;
5919 goto out;
5920 }
5921 data_processed = 1;
5922 /*
5923 * Anything important needs to have been m_copy'ed in
5924 * process_data
5925 */
5926 }
5927 /* take care of ecn */
5928 if ((data_processed == 1) &&
5929 (stcb->asoc.ecn_allowed == 1) &&
5930 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5931 /* Yep, we need to add a ECNE */
5932 sctp_send_ecn_echo(stcb, net, high_tsn);
5933 }
5934 if ((data_processed == 0) && (fwd_tsn_seen)) {
5935 int was_a_gap;
5936 uint32_t highest_tsn;
5937
5938 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5939 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5940 } else {
5941 highest_tsn = stcb->asoc.highest_tsn_inside_map;
5942 }
5943 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5944 stcb->asoc.send_sack = 1;
5945 sctp_sack_check(stcb, was_a_gap);
5946 } else if (fwd_tsn_seen) {
5947 stcb->asoc.send_sack = 1;
5948 }
5949 /* trigger send of any chunks in queue... */
5950 trigger_send:
5951 #ifdef SCTP_AUDITING_ENABLED
5952 sctp_audit_log(0xE0, 2);
5953 sctp_auditing(1, inp, stcb, net);
5954 #endif
5955 SCTPDBG(SCTP_DEBUG_INPUT1,
5956 "Check for chunk output prw:%d tqe:%d tf=%d\n",
5957 stcb->asoc.peers_rwnd,
5958 TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5959 stcb->asoc.total_flight);
5960 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5961 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5962 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5963 }
5964 if (cnt_ctrl_ready ||
5965 ((un_sent) &&
5966 (stcb->asoc.peers_rwnd > 0 ||
5967 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5968 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5969 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5970 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5971 }
5972 #ifdef SCTP_AUDITING_ENABLED
5973 sctp_audit_log(0xE0, 3);
5974 sctp_auditing(2, inp, stcb, net);
5975 #endif
5976 out:
5977 if (stcb != NULL) {
5978 SCTP_TCB_UNLOCK(stcb);
5979 }
5980 if (inp_decr != NULL) {
5981 /* reduce ref-count */
5982 SCTP_INP_WLOCK(inp_decr);
5983 SCTP_INP_DECR_REF(inp_decr);
5984 SCTP_INP_WUNLOCK(inp_decr);
5985 }
5986 #ifdef INVARIANTS
5987 if (inp != NULL) {
5988 sctp_validate_no_locks(inp);
5989 }
5990 #endif
5991 return;
5992 }
5993
5994 #if 0
5995 static void
5996 sctp_print_mbuf_chain(struct mbuf *m)
5997 {
5998 for (; m; m = SCTP_BUF_NEXT(m)) {
5999 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
6000 if (SCTP_BUF_IS_EXTENDED(m))
6001 SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
6002 }
6003 }
6004
6005 #endif
6006
6007 #ifdef INET
6008 void
6009 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6010 {
6011 struct mbuf *m;
6012 int iphlen;
6013 uint32_t vrf_id = 0;
6014 uint8_t ecn_bits;
6015 struct sockaddr_in src, dst;
6016 struct ip *ip;
6017 struct sctphdr *sh;
6018 struct sctp_chunkhdr *ch;
6019 int length, offset;
6020
6021 #if !defined(SCTP_WITH_NO_CSUM)
6022 uint8_t compute_crc;
6023
6024 #endif
6025 uint32_t mflowid;
6026 uint8_t use_mflowid;
6027
6028 iphlen = off;
6029 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6030 SCTP_RELEASE_PKT(i_pak);
6031 return;
6032 }
6033 m = SCTP_HEADER_TO_CHAIN(i_pak);
6034 #ifdef SCTP_MBUF_LOGGING
6035 /* Log in any input mbufs */
6036 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6037 struct mbuf *mat;
6038
6039 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6040 if (SCTP_BUF_IS_EXTENDED(mat)) {
6041 sctp_log_mb(mat, SCTP_MBUF_INPUT);
6042 }
6043 }
6044 }
6045 #endif
6046 #ifdef SCTP_PACKET_LOGGING
6047 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6048 sctp_packet_log(m);
6049 }
6050 #endif
6051 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6052 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6053 m->m_pkthdr.len,
6054 if_name(m->m_pkthdr.rcvif),
6055 (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6056 if (m->m_flags & M_FLOWID) {
6057 mflowid = m->m_pkthdr.flowid;
6058 use_mflowid = 1;
6059 } else {
6060 mflowid = 0;
6061 use_mflowid = 0;
6062 }
6063 SCTP_STAT_INCR(sctps_recvpackets);
6064 SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6065 /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6066 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6067 if (SCTP_BUF_LEN(m) < offset) {
6068 if ((m = m_pullup(m, offset)) == NULL) {
6069 SCTP_STAT_INCR(sctps_hdrops);
6070 return;
6071 }
6072 }
6073 ip = mtod(m, struct ip *);
6074 sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6075 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6076 offset -= sizeof(struct sctp_chunkhdr);
6077 memset(&src, 0, sizeof(struct sockaddr_in));
6078 src.sin_family = AF_INET;
6079 src.sin_len = sizeof(struct sockaddr_in);
6080 src.sin_port = sh->src_port;
6081 src.sin_addr = ip->ip_src;
6082 memset(&dst, 0, sizeof(struct sockaddr_in));
6083 dst.sin_family = AF_INET;
6084 dst.sin_len = sizeof(struct sockaddr_in);
6085 dst.sin_port = sh->dest_port;
6086 dst.sin_addr = ip->ip_dst;
6087 length = ntohs(ip->ip_len);
6088 /* Validate mbuf chain length with IP payload length. */
6089 if (SCTP_HEADER_LEN(m) != length) {
6090 SCTPDBG(SCTP_DEBUG_INPUT1,
6091 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6092 SCTP_STAT_INCR(sctps_hdrops);
6093 goto out;
6094 }
6095 /* SCTP does not allow broadcasts or multicasts */
6096 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6097 goto out;
6098 }
6099 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6100 goto out;
6101 }
6102 ecn_bits = ip->ip_tos;
6103 #if defined(SCTP_WITH_NO_CSUM)
6104 SCTP_STAT_INCR(sctps_recvnocrc);
6105 #else
6106 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6107 SCTP_STAT_INCR(sctps_recvhwcrc);
6108 compute_crc = 0;
6109 } else {
6110 SCTP_STAT_INCR(sctps_recvswcrc);
6111 compute_crc = 1;
6112 }
6113 #endif
6114 sctp_common_input_processing(&m, iphlen, offset, length,
6115 (struct sockaddr *)&src,
6116 (struct sockaddr *)&dst,
6117 sh, ch,
6118 #if !defined(SCTP_WITH_NO_CSUM)
6119 compute_crc,
6120 #endif
6121 ecn_bits,
6122 use_mflowid, mflowid,
6123 vrf_id, port);
6124 out:
6125 if (m) {
6126 sctp_m_freem(m);
6127 }
6128 return;
6129 }
6130
6131 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6132 extern int *sctp_cpuarry;
6133
6134 #endif
6135
6136 void
6137 sctp_input(struct mbuf *m, int off)
6138 {
6139 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6140 struct ip *ip;
6141 struct sctphdr *sh;
6142 int offset;
6143 int cpu_to_use;
6144 uint32_t flowid, tag;
6145
6146 if (mp_ncpus > 1) {
6147 if (m->m_flags & M_FLOWID) {
6148 flowid = m->m_pkthdr.flowid;
6149 } else {
6150 /*
6151 * No flow id built by lower layers fix it so we
6152 * create one.
6153 */
6154 offset = off + sizeof(struct sctphdr);
6155 if (SCTP_BUF_LEN(m) < offset) {
6156 if ((m = m_pullup(m, offset)) == NULL) {
6157 SCTP_STAT_INCR(sctps_hdrops);
6158 return;
6159 }
6160 }
6161 ip = mtod(m, struct ip *);
6162 sh = (struct sctphdr *)((caddr_t)ip + off);
6163 tag = htonl(sh->v_tag);
6164 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6165 m->m_pkthdr.flowid = flowid;
6166 m->m_flags |= M_FLOWID;
6167 }
6168 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6169 sctp_queue_to_mcore(m, off, cpu_to_use);
6170 return;
6171 }
6172 #endif
6173 sctp_input_with_port(m, off, 0);
6174 }
6175
6176 #endif
Cache object: e8ea57d797f24638b07213b732a1e873
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