1/*-
2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * a) Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 *
10 * b) Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the distribution.
13 *
14 * c) Neither the name of Cisco Systems, Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28 * THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31/* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 179783 2008-06-14 07:58:05Z rrs $");
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/udp.h>
50
51
52
53static void
54sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
55{
56 struct sctp_nets *net;
57
58 /*
59 * This now not only stops all cookie timers it also stops any INIT
60 * timers as well. This will make sure that the timers are stopped
61 * in all collision cases.
62 */
63 SCTP_TCB_LOCK_ASSERT(stcb);
64 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
65 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
66 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
67 stcb->sctp_ep,
68 stcb,
69 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
70 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
71 sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
72 stcb->sctp_ep,
73 stcb,
74 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
75 }
76 }
77}
78
79/* INIT handler */
80static void
81sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
82 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
83 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port)
84{
85 struct sctp_init *init;
86 struct mbuf *op_err;
87 uint32_t init_limit;
88
89 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
90 stcb);
91 if (stcb == NULL) {
92 SCTP_INP_RLOCK(inp);
93 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
94 goto outnow;
95 }
96 }
97 op_err = NULL;
98 init = &cp->init;
99 /* First are we accepting? */
100 if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) {
101 SCTPDBG(SCTP_DEBUG_INPUT2,
102 "sctp_handle_init: Abort, so_qlimit:%d\n",
103 inp->sctp_socket->so_qlimit);
104 /*
105 * FIX ME ?? What about TCP model and we have a
106 * match/restart case? Actually no fix is needed. the lookup
107 * will always find the existing assoc so stcb would not be
108 * NULL. It may be questionable to do this since we COULD
109 * just send back the INIT-ACK and hope that the app did
110 * accept()'s by the time the COOKIE was sent. But there is
111 * a price to pay for COOKIE generation and I don't want to
112 * pay it on the chance that the app will actually do some
113 * accepts(). The App just looses and should NOT be in this
114 * state :-)
115 */
116 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
117 vrf_id, port);
118 if (stcb)
119 *abort_no_unlock = 1;
120 goto outnow;
121 }
122 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
123 /* Invalid length */
124 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
125 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
126 vrf_id, port);
127 if (stcb)
128 *abort_no_unlock = 1;
129 goto outnow;
130 }
131 /* validate parameters */
132 if (init->initiate_tag == 0) {
133 /* protocol error... send abort */
134 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
135 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
136 vrf_id, port);
137 if (stcb)
138 *abort_no_unlock = 1;
139 goto outnow;
140 }
141 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
142 /* invalid parameter... send abort */
143 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
144 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
145 vrf_id, port);
146 if (stcb)
147 *abort_no_unlock = 1;
148 goto outnow;
149 }
150 if (init->num_inbound_streams == 0) {
151 /* protocol error... send abort */
152 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
153 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
154 vrf_id, port);
155 if (stcb)
156 *abort_no_unlock = 1;
157 goto outnow;
158 }
159 if (init->num_outbound_streams == 0) {
160 /* protocol error... send abort */
161 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
162 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err,
163 vrf_id, port);
164 if (stcb)
165 *abort_no_unlock = 1;
166 goto outnow;
167 }
168 init_limit = offset + ntohs(cp->ch.chunk_length);
169 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
170 init_limit)) {
171 /* auth parameter(s) error... send abort */
172 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port);
173 if (stcb)
174 *abort_no_unlock = 1;
175 goto outnow;
176 }
177 /* send an INIT-ACK w/cookie */
178 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
179 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port,
180 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
181outnow:
182 if (stcb == NULL) {
183 SCTP_INP_RUNLOCK(inp);
184 }
185}
186
187/*
188 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
189 */
190
191int
192sctp_is_there_unsent_data(struct sctp_tcb *stcb)
193{
194 int unsent_data = 0;
195 struct sctp_stream_queue_pending *sp;
196 struct sctp_stream_out *strq;
197 struct sctp_association *asoc;
198
199 /*
200 * This function returns the number of streams that have true unsent
201 * data on them. Note that as it looks through it will clean up any
202 * places that have old data that has been sent but left at top of
203 * stream queue.
204 */
205 asoc = &stcb->asoc;
206 SCTP_TCB_SEND_LOCK(stcb);
207 if (!TAILQ_EMPTY(&asoc->out_wheel)) {
208 /* Check to see if some data queued */
209 TAILQ_FOREACH(strq, &asoc->out_wheel, next_spoke) {
210 is_there_another:
211 /* sa_ignore FREED_MEMORY */
212 sp = TAILQ_FIRST(&strq->outqueue);
213 if (sp == NULL) {
214 continue;
215 }
216 if ((sp->msg_is_complete) &&
217 (sp->length == 0) &&
218 (sp->sender_all_done)) {
219 /*
220 * We are doing differed cleanup. Last time
221 * through when we took all the data the
222 * sender_all_done was not set.
223 */
224 if (sp->put_last_out == 0) {
225 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
226 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
227 sp->sender_all_done,
228 sp->length,
229 sp->msg_is_complete,
230 sp->put_last_out);
231 }
232 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
233 TAILQ_REMOVE(&strq->outqueue, sp, next);
234 sctp_free_remote_addr(sp->net);
235 if (sp->data) {
236 sctp_m_freem(sp->data);
237 sp->data = NULL;
238 }
239 sctp_free_a_strmoq(stcb, sp);
240 goto is_there_another;
241 } else {
242 unsent_data++;
243 continue;
244 }
245 }
246 }
247 SCTP_TCB_SEND_UNLOCK(stcb);
248 return (unsent_data);
249}
250
251static int
252sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb,
253 struct sctp_nets *net)
254{
255 struct sctp_init *init;
256 struct sctp_association *asoc;
257 struct sctp_nets *lnet;
258 unsigned int i;
259
260 init = &cp->init;
261 asoc = &stcb->asoc;
262 /* save off parameters */
263 asoc->peer_vtag = ntohl(init->initiate_tag);
264 asoc->peers_rwnd = ntohl(init->a_rwnd);
265 if (TAILQ_FIRST(&asoc->nets)) {
266 /* update any ssthresh's that may have a default */
267 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
268 lnet->ssthresh = asoc->peers_rwnd;
269
270 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
271 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
272 }
273 }
274 }
275 SCTP_TCB_SEND_LOCK(stcb);
276 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
277 unsigned int newcnt;
278 struct sctp_stream_out *outs;
279 struct sctp_stream_queue_pending *sp;
280
281 /* cut back on number of streams */
282 newcnt = ntohs(init->num_inbound_streams);
283 /* This if is probably not needed but I am cautious */
284 if (asoc->strmout) {
285 /* First make sure no data chunks are trapped */
286 for (i = newcnt; i < asoc->pre_open_streams; i++) {
287 outs = &asoc->strmout[i];
288 sp = TAILQ_FIRST(&outs->outqueue);
289 while (sp) {
290 TAILQ_REMOVE(&outs->outqueue, sp,
291 next);
292 asoc->stream_queue_cnt--;
293 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
294 stcb, SCTP_NOTIFY_DATAGRAM_UNSENT,
295 sp, SCTP_SO_NOT_LOCKED);
296 if (sp->data) {
297 sctp_m_freem(sp->data);
298 sp->data = NULL;
299 }
300 sctp_free_remote_addr(sp->net);
301 sp->net = NULL;
302 /* Free the chunk */
303 SCTP_PRINTF("sp:%p tcb:%p weird free case\n",
304 sp, stcb);
305
306 sctp_free_a_strmoq(stcb, sp);
307 /* sa_ignore FREED_MEMORY */
308 sp = TAILQ_FIRST(&outs->outqueue);
309 }
310 }
311 }
312 /* cut back the count and abandon the upper streams */
313 asoc->pre_open_streams = newcnt;
314 }
315 SCTP_TCB_SEND_UNLOCK(stcb);
316 asoc->streamoutcnt = asoc->pre_open_streams;
317 /* init tsn's */
318 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
319 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
320 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
321 }
322 /* This is the next one we expect */
323 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
324
325 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
326 asoc->cumulative_tsn = asoc->asconf_seq_in;
327 asoc->last_echo_tsn = asoc->asconf_seq_in;
328 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
329 /* open the requested streams */
330
331 if (asoc->strmin != NULL) {
332 /* Free the old ones */
333 struct sctp_queued_to_read *ctl;
334
335 for (i = 0; i < asoc->streamincnt; i++) {
336 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue);
337 while (ctl) {
338 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
339 sctp_free_remote_addr(ctl->whoFrom);
340 ctl->whoFrom = NULL;
341 sctp_m_freem(ctl->data);
342 ctl->data = NULL;
343 sctp_free_a_readq(stcb, ctl);
344 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue);
345 }
346 }
347 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
348 }
349 asoc->streamincnt = ntohs(init->num_outbound_streams);
350 if (asoc->streamincnt > MAX_SCTP_STREAMS) {
351 asoc->streamincnt = MAX_SCTP_STREAMS;
352 }
353 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
354 sizeof(struct sctp_stream_in), SCTP_M_STRMI);
355 if (asoc->strmin == NULL) {
356 /* we didn't get memory for the streams! */
357 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
358 return (-1);
359 }
360 for (i = 0; i < asoc->streamincnt; i++) {
361 asoc->strmin[i].stream_no = i;
362 asoc->strmin[i].last_sequence_delivered = 0xffff;
363 /*
364 * U-stream ranges will be set when the cookie is unpacked.
365 * Or for the INIT sender they are un set (if pr-sctp not
366 * supported) when the INIT-ACK arrives.
367 */
368 TAILQ_INIT(&asoc->strmin[i].inqueue);
369 asoc->strmin[i].delivery_started = 0;
370 }
371 /*
372 * load_address_from_init will put the addresses into the
373 * association when the COOKIE is processed or the INIT-ACK is
374 * processed. Both types of COOKIE's existing and new call this
375 * routine. It will remove addresses that are no longer in the
376 * association (for the restarting case where addresses are
377 * removed). Up front when the INIT arrives we will discard it if it
378 * is a restart and new addresses have been added.
379 */
380 /* sa_ignore MEMLEAK */
381 return (0);
382}
383
384/*
385 * INIT-ACK message processing/consumption returns value < 0 on error
386 */
387static int
388sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
389 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
390 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
391{
392 struct sctp_association *asoc;
393 struct mbuf *op_err;
394 int retval, abort_flag;
395 uint32_t initack_limit;
396
397 /* First verify that we have no illegal param's */
398 abort_flag = 0;
399 op_err = NULL;
400
401 op_err = sctp_arethere_unrecognized_parameters(m,
402 (offset + sizeof(struct sctp_init_chunk)),
403 &abort_flag, (struct sctp_chunkhdr *)cp);
404 if (abort_flag) {
405 /* Send an abort and notify peer */
406 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED);
407 *abort_no_unlock = 1;
408 return (-1);
409 }
410 asoc = &stcb->asoc;
411 /* process the peer's parameters in the INIT-ACK */
412 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net);
413 if (retval < 0) {
414 return (retval);
415 }
416 initack_limit = offset + ntohs(cp->ch.chunk_length);
417 /* load all addresses */
418 if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen,
419 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
420 NULL))) {
421 /* Huh, we should abort */
422 SCTPDBG(SCTP_DEBUG_INPUT1,
423 "Load addresses from INIT causes an abort %d\n",
424 retval);
425 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
426 NULL, 0, net->port);
427 *abort_no_unlock = 1;
428 return (-1);
429 }
430 /* if the peer doesn't support asconf, flush the asconf queue */
431 if (asoc->peer_supports_asconf == 0) {
432 struct sctp_asconf_addr *aparam;
433
434 while (!TAILQ_EMPTY(&asoc->asconf_queue)) {
435 /* sa_ignore FREED_MEMORY */
436 aparam = TAILQ_FIRST(&asoc->asconf_queue);
437 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
438 SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
439 }
440 }
441 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
442 stcb->asoc.local_hmacs);
443 if (op_err) {
444 sctp_queue_op_err(stcb, op_err);
445 /* queuing will steal away the mbuf chain to the out queue */
446 op_err = NULL;
447 }
448 /* extract the cookie and queue it to "echo" it back... */
449 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
450 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
451 stcb->asoc.overall_error_count,
452 0,
453 SCTP_FROM_SCTP_INPUT,
454 __LINE__);
455 }
456 stcb->asoc.overall_error_count = 0;
457 net->error_count = 0;
458
459 /*
460 * Cancel the INIT timer, We do this first before queueing the
461 * cookie. We always cancel at the primary to assue that we are
462 * canceling the timer started by the INIT which always goes to the
463 * primary.
464 */
465 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
466 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
467
468 /* calculate the RTO */
469 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy);
470
471 retval = sctp_send_cookie_echo(m, offset, stcb, net);
472 if (retval < 0) {
473 /*
474 * No cookie, we probably should send a op error. But in any
475 * case if there is no cookie in the INIT-ACK, we can
476 * abandon the peer, its broke.
477 */
478 if (retval == -3) {
479 /* We abort with an error of missing mandatory param */
480 op_err =
481 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
482 if (op_err) {
483 /*
484 * Expand beyond to include the mandatory
485 * param cookie
486 */
487 struct sctp_inv_mandatory_param *mp;
488
489 SCTP_BUF_LEN(op_err) =
490 sizeof(struct sctp_inv_mandatory_param);
491 mp = mtod(op_err,
492 struct sctp_inv_mandatory_param *);
493 /* Subtract the reserved param */
494 mp->length =
495 htons(sizeof(struct sctp_inv_mandatory_param) - 2);
496 mp->num_param = htonl(1);
497 mp->param = htons(SCTP_STATE_COOKIE);
498 mp->resv = 0;
499 }
500 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
501 sh, op_err, 0, net->port);
502 *abort_no_unlock = 1;
503 }
504 return (retval);
505 }
506 return (0);
507}
508
509static void
510sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
511 struct sctp_tcb *stcb, struct sctp_nets *net)
512{
513 struct sockaddr_storage store;
514 struct sockaddr_in *sin;
515 struct sockaddr_in6 *sin6;
516 struct sctp_nets *r_net;
517 struct timeval tv;
518 int req_prim = 0;
519
520 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
521 /* Invalid length */
522 return;
523 }
524 sin = (struct sockaddr_in *)&store;
525 sin6 = (struct sockaddr_in6 *)&store;
526
527 memset(&store, 0, sizeof(store));
528 if (cp->heartbeat.hb_info.addr_family == AF_INET &&
529 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
530 sin->sin_family = cp->heartbeat.hb_info.addr_family;
531 sin->sin_len = cp->heartbeat.hb_info.addr_len;
532 sin->sin_port = stcb->rport;
533 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
534 sizeof(sin->sin_addr));
535 } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 &&
536 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
537 sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
538 sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
539 sin6->sin6_port = stcb->rport;
540 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
541 sizeof(sin6->sin6_addr));
542 } else {
543 return;
544 }
545 r_net = sctp_findnet(stcb, (struct sockaddr *)sin);
546 if (r_net == NULL) {
547 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
548 return;
549 }
550 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
551 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
552 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
553 /*
554 * If the its a HB and it's random value is correct when can
555 * confirm the destination.
556 */
557 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
558 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
559 stcb->asoc.primary_destination = r_net;
560 r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY;
561 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
562 r_net = TAILQ_FIRST(&stcb->asoc.nets);
563 if (r_net != stcb->asoc.primary_destination) {
564 /*
565 * first one on the list is NOT the primary
566 * sctp_cmpaddr() is much more efficent if
567 * the primary is the first on the list,
568 * make it so.
569 */
570 TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next);
571 TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next);
572 }
573 req_prim = 1;
574 }
575 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
576 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
577 }
578 r_net->error_count = 0;
579 r_net->hb_responded = 1;
580 tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
581 tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
582 if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) {
583 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE;
584 r_net->dest_state |= SCTP_ADDR_REACHABLE;
585 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
586 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED);
587 /* now was it the primary? if so restore */
588 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) {
589 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net);
590 }
591 }
592 /*
593 * JRS 5/14/07 - If CMT PF is on and the destination is in PF state,
594 * set the destination to active state and set the cwnd to one or
595 * two MTU's based on whether PF1 or PF2 is being used. If a T3
596 * timer is running, for the destination, stop the timer because a
597 * PF-heartbeat was received.
598 */
599 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
600 SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
601 (net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) {
602 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
603 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
604 stcb, net,
605 SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
606 }
607 net->dest_state &= ~SCTP_ADDR_PF;
608 net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf);
609 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n",
610 net, net->cwnd);
611 }
612 /* Now lets do a RTO with this */
613 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy);
614 /* Mobility adaptation */
615 if (req_prim) {
616 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
617 SCTP_MOBILITY_BASE) ||
618 sctp_is_mobility_feature_on(stcb->sctp_ep,
619 SCTP_MOBILITY_FASTHANDOFF)) &&
620 sctp_is_mobility_feature_on(stcb->sctp_ep,
621 SCTP_MOBILITY_PRIM_DELETED)) {
622
623 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
624 if (sctp_is_mobility_feature_on(stcb->sctp_ep,
625 SCTP_MOBILITY_FASTHANDOFF)) {
626 sctp_assoc_immediate_retrans(stcb,
627 stcb->asoc.primary_destination);
628 }
629 if (sctp_is_mobility_feature_on(stcb->sctp_ep,
630 SCTP_MOBILITY_BASE)) {
631 sctp_move_chunks_from_deleted_prim(stcb,
632 stcb->asoc.primary_destination);
633 }
634 sctp_delete_prim_timer(stcb->sctp_ep, stcb,
635 stcb->asoc.deleted_primary);
636 }
637 }
638}
639
640static void
641sctp_handle_abort(struct sctp_abort_chunk *cp,
642 struct sctp_tcb *stcb, struct sctp_nets *net)
643{
644#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
645 struct socket *so;
646
647#endif
648
649 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
650 if (stcb == NULL)
651 return;
652
653 /* stop any receive timers */
654 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
655 /* notify user of the abort and clean up... */
656 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
657 /* free the tcb */
658#if defined(SCTP_PANIC_ON_ABORT)
659 printf("stcb:%p state:%d rport:%d net:%p\n",
660 stcb, stcb->asoc.state, stcb->rport, net);
661 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
662 panic("Received an ABORT");
663 } else {
664 printf("No panic its in state %x closed\n", stcb->asoc.state);
665 }
666#endif
667 SCTP_STAT_INCR_COUNTER32(sctps_aborted);
668 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
669 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
670 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
671 }
672#ifdef SCTP_ASOCLOG_OF_TSNS
673 sctp_print_out_track_log(stcb);
674#endif
675#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
676 so = SCTP_INP_SO(stcb->sctp_ep);
677 atomic_add_int(&stcb->asoc.refcnt, 1);
678 SCTP_TCB_UNLOCK(stcb);
679 SCTP_SOCKET_LOCK(so, 1);
680 SCTP_TCB_LOCK(stcb);
681 atomic_subtract_int(&stcb->asoc.refcnt, 1);
682#endif
683 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
684 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
685 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
686#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
687 SCTP_SOCKET_UNLOCK(so, 1);
688#endif
689 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
690}
691
692static void
693sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
694 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
695{
696 struct sctp_association *asoc;
697 int some_on_streamwheel;
698
699#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
700 struct socket *so;
701
702#endif
703
704 SCTPDBG(SCTP_DEBUG_INPUT2,
705 "sctp_handle_shutdown: handling SHUTDOWN\n");
706 if (stcb == NULL)
707 return;
708 asoc = &stcb->asoc;
709 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
710 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
711 return;
712 }
713 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
714 /* Shutdown NOT the expected size */
715 return;
716 } else {
717 sctp_update_acked(stcb, cp, net, abort_flag);
718 }
719 if (asoc->control_pdapi) {
720 /*
721 * With a normal shutdown we assume the end of last record.
722 */
723 SCTP_INP_READ_LOCK(stcb->sctp_ep);
724 asoc->control_pdapi->end_added = 1;
725 asoc->control_pdapi->pdapi_aborted = 1;
726 asoc->control_pdapi = NULL;
727 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
728#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
729 so = SCTP_INP_SO(stcb->sctp_ep);
730 atomic_add_int(&stcb->asoc.refcnt, 1);
731 SCTP_TCB_UNLOCK(stcb);
732 SCTP_SOCKET_LOCK(so, 1);
733 SCTP_TCB_LOCK(stcb);
734 atomic_subtract_int(&stcb->asoc.refcnt, 1);
735 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
736 /* assoc was freed while we were unlocked */
737 SCTP_SOCKET_UNLOCK(so, 1);
738 return;
739 }
740#endif
741 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
742#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
743 SCTP_SOCKET_UNLOCK(so, 1);
744#endif
745 }
746 /* goto SHUTDOWN_RECEIVED state to block new requests */
747 if (stcb->sctp_socket) {
748 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
749 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
750 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
751 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
752 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
753 /*
754 * notify upper layer that peer has initiated a
755 * shutdown
756 */
757 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
758
759 /* reset time */
760 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
761 }
762 }
763 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
764 /*
765 * stop the shutdown timer, since we WILL move to
766 * SHUTDOWN-ACK-SENT.
767 */
768 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
769 }
770 /* Now is there unsent data on a stream somewhere? */
771 some_on_streamwheel = sctp_is_there_unsent_data(stcb);
772
773 if (!TAILQ_EMPTY(&asoc->send_queue) ||
774 !TAILQ_EMPTY(&asoc->sent_queue) ||
775 some_on_streamwheel) {
776 /* By returning we will push more data out */
777 return;
778 } else {
779 /* no outstanding data to send, so move on... */
780 /* send SHUTDOWN-ACK */
781 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
782 /* move to SHUTDOWN-ACK-SENT state */
783 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
784 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
785 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
786 }
787 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
788 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
789 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
790 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
791 /* start SHUTDOWN timer */
792 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
793 stcb, net);
794 }
795}
796
797static void
798sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp,
799 struct sctp_tcb *stcb, struct sctp_nets *net)
800{
801 struct sctp_association *asoc;
802
803#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
804 struct socket *so;
805
806 so = SCTP_INP_SO(stcb->sctp_ep);
807#endif
808 SCTPDBG(SCTP_DEBUG_INPUT2,
809 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
810 if (stcb == NULL)
811 return;
812
813 asoc = &stcb->asoc;
814 /* process according to association state */
815 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
816 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
817 /* unexpected SHUTDOWN-ACK... so ignore... */
818 SCTP_TCB_UNLOCK(stcb);
819 return;
820 }
821 if (asoc->control_pdapi) {
822 /*
823 * With a normal shutdown we assume the end of last record.
824 */
825 SCTP_INP_READ_LOCK(stcb->sctp_ep);
826 asoc->control_pdapi->end_added = 1;
827 asoc->control_pdapi->pdapi_aborted = 1;
828 asoc->control_pdapi = NULL;
829 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
830#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
831 atomic_add_int(&stcb->asoc.refcnt, 1);
832 SCTP_TCB_UNLOCK(stcb);
833 SCTP_SOCKET_LOCK(so, 1);
834 SCTP_TCB_LOCK(stcb);
835 atomic_subtract_int(&stcb->asoc.refcnt, 1);
836 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
837 /* assoc was freed while we were unlocked */
838 SCTP_SOCKET_UNLOCK(so, 1);
839 return;
840 }
841#endif
842 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
843#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
844 SCTP_SOCKET_UNLOCK(so, 1);
845#endif
846 }
847 /* are the queues empty? */
848 if (!TAILQ_EMPTY(&asoc->send_queue) ||
849 !TAILQ_EMPTY(&asoc->sent_queue) ||
850 !TAILQ_EMPTY(&asoc->out_wheel)) {
851 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
852 }
853 /* stop the timer */
854 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
855 /* send SHUTDOWN-COMPLETE */
856 sctp_send_shutdown_complete(stcb, net);
857 /* notify upper layer protocol */
858 if (stcb->sctp_socket) {
859 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
860 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
861 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
862 /* Set the connected flag to disconnected */
863 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0;
864 }
865 }
866 SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
867 /* free the TCB but first save off the ep */
868#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
869 atomic_add_int(&stcb->asoc.refcnt, 1);
870 SCTP_TCB_UNLOCK(stcb);
871 SCTP_SOCKET_LOCK(so, 1);
872 SCTP_TCB_LOCK(stcb);
873 atomic_subtract_int(&stcb->asoc.refcnt, 1);
874#endif
875 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
876 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
877#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
878 SCTP_SOCKET_UNLOCK(so, 1);
879#endif
880}
881
882/*
883 * Skip past the param header and then we will find the chunk that caused the
884 * problem. There are two possiblities ASCONF or FWD-TSN other than that and
885 * our peer must be broken.
886 */
887static void
888sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
889 struct sctp_nets *net)
890{
891 struct sctp_chunkhdr *chk;
892
893 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
894 switch (chk->chunk_type) {
895 case SCTP_ASCONF_ACK:
896 case SCTP_ASCONF:
897 sctp_asconf_cleanup(stcb, net);
898 break;
899 case SCTP_FORWARD_CUM_TSN:
900 stcb->asoc.peer_supports_prsctp = 0;
901 break;
902 default:
903 SCTPDBG(SCTP_DEBUG_INPUT2,
904 "Peer does not support chunk type %d(%x)??\n",
905 chk->chunk_type, (uint32_t) chk->chunk_type);
906 break;
907 }
908}
909
910/*
911 * Skip past the param header and then we will find the param that caused the
912 * problem. There are a number of param's in a ASCONF OR the prsctp param
913 * these will turn of specific features.
914 */
915static void
916sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
917{
918 struct sctp_paramhdr *pbad;
919
920 pbad = phdr + 1;
921 switch (ntohs(pbad->param_type)) {
922 /* pr-sctp draft */
923 case SCTP_PRSCTP_SUPPORTED:
924 stcb->asoc.peer_supports_prsctp = 0;
925 break;
926 case SCTP_SUPPORTED_CHUNK_EXT:
927 break;
928 /* draft-ietf-tsvwg-addip-sctp */
929 case SCTP_ECN_NONCE_SUPPORTED:
930 stcb->asoc.peer_supports_ecn_nonce = 0;
931 stcb->asoc.ecn_nonce_allowed = 0;
932 stcb->asoc.ecn_allowed = 0;
933 break;
934 case SCTP_ADD_IP_ADDRESS:
935 case SCTP_DEL_IP_ADDRESS:
936 case SCTP_SET_PRIM_ADDR:
937 stcb->asoc.peer_supports_asconf = 0;
938 break;
939 case SCTP_SUCCESS_REPORT:
940 case SCTP_ERROR_CAUSE_IND:
941 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
942 SCTPDBG(SCTP_DEBUG_INPUT2,
943 "Turning off ASCONF to this strange peer\n");
944 stcb->asoc.peer_supports_asconf = 0;
945 break;
946 default:
947 SCTPDBG(SCTP_DEBUG_INPUT2,
948 "Peer does not support param type %d(%x)??\n",
949 pbad->param_type, (uint32_t) pbad->param_type);
950 break;
951 }
952}
953
954static int
955sctp_handle_error(struct sctp_chunkhdr *ch,
956 struct sctp_tcb *stcb, struct sctp_nets *net)
957{
958 int chklen;
959 struct sctp_paramhdr *phdr;
960 uint16_t error_type;
961 uint16_t error_len;
962 struct sctp_association *asoc;
963 int adjust;
964
965#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
966 struct socket *so;
967
968#endif
969
970 /* parse through all of the errors and process */
971 asoc = &stcb->asoc;
972 phdr = (struct sctp_paramhdr *)((caddr_t)ch +
973 sizeof(struct sctp_chunkhdr));
974 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
975 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
976 /* Process an Error Cause */
977 error_type = ntohs(phdr->param_type);
978 error_len = ntohs(phdr->param_length);
979 if ((error_len > chklen) || (error_len == 0)) {
980 /* invalid param length for this param */
981 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
982 chklen, error_len);
983 return (0);
984 }
985 switch (error_type) {
986 case SCTP_CAUSE_INVALID_STREAM:
987 case SCTP_CAUSE_MISSING_PARAM:
988 case SCTP_CAUSE_INVALID_PARAM:
989 case SCTP_CAUSE_NO_USER_DATA:
990 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
991 error_type);
992 break;
993 case SCTP_CAUSE_STALE_COOKIE:
994 /*
995 * We only act if we have echoed a cookie and are
996 * waiting.
997 */
998 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
999 int *p;
1000
1001 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1002 /* Save the time doubled */
1003 asoc->cookie_preserve_req = ntohl(*p) << 1;
1004 asoc->stale_cookie_count++;
1005 if (asoc->stale_cookie_count >
1006 asoc->max_init_times) {
1007 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED);
1008 /* now free the asoc */
1009#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1010 so = SCTP_INP_SO(stcb->sctp_ep);
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#endif
1017 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1018 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1019#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1020 SCTP_SOCKET_UNLOCK(so, 1);
1021#endif
1022 return (-1);
1023 }
1024 /* blast back to INIT state */
1025 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1026 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1027
1028 sctp_stop_all_cookie_timers(stcb);
1029 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1030 }
1031 break;
1032 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1033 /*
1034 * Nothing we can do here, we don't do hostname
1035 * addresses so if the peer does not like my IPv6
1036 * (or IPv4 for that matter) it does not matter. If
1037 * they don't support that type of address, they can
1038 * NOT possibly get that packet type... i.e. with no
1039 * IPv6 you can't recieve a IPv6 packet. so we can
1040 * safely ignore this one. If we ever added support
1041 * for HOSTNAME Addresses, then we would need to do
1042 * something here.
1043 */
1044 break;
1045 case SCTP_CAUSE_UNRECOG_CHUNK:
1046 sctp_process_unrecog_chunk(stcb, phdr, net);
1047 break;
1048 case SCTP_CAUSE_UNRECOG_PARAM:
1049 sctp_process_unrecog_param(stcb, phdr);
1050 break;
1051 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1052 /*
1053 * We ignore this since the timer will drive out a
1054 * new cookie anyway and there timer will drive us
1055 * to send a SHUTDOWN_COMPLETE. We can't send one
1056 * here since we don't have their tag.
1057 */
1058 break;
1059 case SCTP_CAUSE_DELETING_LAST_ADDR:
1060 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1061 case SCTP_CAUSE_DELETING_SRC_ADDR:
1062 /*
1063 * We should NOT get these here, but in a
1064 * ASCONF-ACK.
1065 */
1066 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1067 error_type);
1068 break;
1069 case SCTP_CAUSE_OUT_OF_RESC:
1070 /*
1071 * And what, pray tell do we do with the fact that
1072 * the peer is out of resources? Not really sure we
1073 * could do anything but abort. I suspect this
1074 * should have came WITH an abort instead of in a
1075 * OP-ERROR.
1076 */
1077 break;
1078 default:
1079 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1080 error_type);
1081 break;
1082 }
1083 adjust = SCTP_SIZE32(error_len);
1084 chklen -= adjust;
1085 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1086 }
1087 return (0);
1088}
1089
1090static int
1091sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1092 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1093 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id)
1094{
1095 struct sctp_init_ack *init_ack;
1096 struct mbuf *op_err;
1097
1098 SCTPDBG(SCTP_DEBUG_INPUT2,
1099 "sctp_handle_init_ack: handling INIT-ACK\n");
1100
1101 if (stcb == NULL) {
1102 SCTPDBG(SCTP_DEBUG_INPUT2,
1103 "sctp_handle_init_ack: TCB is null\n");
1104 return (-1);
1105 }
1106 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1107 /* Invalid length */
1108 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1109 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1110 op_err, 0, net->port);
1111 *abort_no_unlock = 1;
1112 return (-1);
1113 }
1114 init_ack = &cp->init;
1115 /* validate parameters */
1116 if (init_ack->initiate_tag == 0) {
1117 /* protocol error... send an abort */
1118 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1119 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1120 op_err, 0, net->port);
1121 *abort_no_unlock = 1;
1122 return (-1);
1123 }
1124 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1125 /* protocol error... send an abort */
1126 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1127 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1128 op_err, 0, net->port);
1129 *abort_no_unlock = 1;
1130 return (-1);
1131 }
1132 if (init_ack->num_inbound_streams == 0) {
1133 /* protocol error... send an abort */
1134 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1135 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1136 op_err, 0, net->port);
1137 *abort_no_unlock = 1;
1138 return (-1);
1139 }
1140 if (init_ack->num_outbound_streams == 0) {
1141 /* protocol error... send an abort */
1142 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1143 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
1144 op_err, 0, net->port);
1145 *abort_no_unlock = 1;
1146 return (-1);
1147 }
1148 /* process according to association state... */
1149 switch (stcb->asoc.state & SCTP_STATE_MASK) {
1150 case SCTP_STATE_COOKIE_WAIT:
1151 /* this is the expected state for this chunk */
1152 /* process the INIT-ACK parameters */
1153 if (stcb->asoc.primary_destination->dest_state &
1154 SCTP_ADDR_UNCONFIRMED) {
1155 /*
1156 * The primary is where we sent the INIT, we can
1157 * always consider it confirmed when the INIT-ACK is
1158 * returned. Do this before we load addresses
1159 * though.
1160 */
1161 stcb->asoc.primary_destination->dest_state &=
1162 ~SCTP_ADDR_UNCONFIRMED;
1163 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1164 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1165 }
1166 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb,
1167 net, abort_no_unlock, vrf_id) < 0) {
1168 /* error in parsing parameters */
1169 return (-1);
1170 }
1171 /* update our state */
1172 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1173 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1174
1175 /* reset the RTO calc */
1176 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1177 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1178 stcb->asoc.overall_error_count,
1179 0,
1180 SCTP_FROM_SCTP_INPUT,
1181 __LINE__);
1182 }
1183 stcb->asoc.overall_error_count = 0;
1184 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1185 /*
1186 * collapse the init timer back in case of a exponential
1187 * backoff
1188 */
1189 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1190 stcb, net);
1191 /*
1192 * the send at the end of the inbound data processing will
1193 * cause the cookie to be sent
1194 */
1195 break;
1196 case SCTP_STATE_SHUTDOWN_SENT:
1197 /* incorrect state... discard */
1198 break;
1199 case SCTP_STATE_COOKIE_ECHOED:
1200 /* incorrect state... discard */
1201 break;
1202 case SCTP_STATE_OPEN:
1203 /* incorrect state... discard */
1204 break;
1205 case SCTP_STATE_EMPTY:
1206 case SCTP_STATE_INUSE:
1207 default:
1208 /* incorrect state... discard */
1209 return (-1);
1210 break;
1211 }
1212 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1213 return (0);
1214}
1215
1216
1217/*
1218 * handle a state cookie for an existing association m: input packet mbuf
1219 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1220 * "split" mbuf and the cookie signature does not exist offset: offset into
1221 * mbuf to the cookie-echo chunk
1222 */
1223static struct sctp_tcb *
1224sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1225 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1226 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
1227 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id,
1228 uint32_t vrf_id)
1229{
1230 struct sctp_association *asoc;
1231 struct sctp_init_chunk *init_cp, init_buf;
1232 struct sctp_init_ack_chunk *initack_cp, initack_buf;
1233 int chk_length;
1234 int init_offset, initack_offset, i;
1235 int retval;
1236 int spec_flag = 0;
1237 uint32_t how_indx;
1238
1239 /* I know that the TCB is non-NULL from the caller */
1240 asoc = &stcb->asoc;
1241 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1242 if (asoc->cookie_how[how_indx] == 0)
1243 break;
1244 }
1245 if (how_indx < sizeof(asoc->cookie_how)) {
1246 asoc->cookie_how[how_indx] = 1;
1247 }
1248 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1249 /* SHUTDOWN came in after sending INIT-ACK */
1250 struct mbuf *op_err;
1251 struct sctp_paramhdr *ph;
1252
1253 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1254 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1255 0, M_DONTWAIT, 1, MT_DATA);
1256 if (op_err == NULL) {
1257 /* FOOBAR */
1258 return (NULL);
1259 }
1260 /* pre-reserve some space */
1261#ifdef INET6
1262 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1263#else
1264 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1265#endif
1266 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1267 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1268 /* Set the len */
1269 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1270 ph = mtod(op_err, struct sctp_paramhdr *);
1271 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1272 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1273 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
1274 vrf_id, net->port);
1275 if (how_indx < sizeof(asoc->cookie_how))
1276 asoc->cookie_how[how_indx] = 2;
1277 return (NULL);
1278 }
1279 /*
1280 * find and validate the INIT chunk in the cookie (peer's info) the
1281 * INIT should start after the cookie-echo header struct (chunk
1282 * header, state cookie header struct)
1283 */
1284 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1285
1286 init_cp = (struct sctp_init_chunk *)
1287 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1288 (uint8_t *) & init_buf);
1289 if (init_cp == NULL) {
1290 /* could not pull a INIT chunk in cookie */
1291 return (NULL);
1292 }
1293 chk_length = ntohs(init_cp->ch.chunk_length);
1294 if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1295 return (NULL);
1296 }
1297 /*
1298 * find and validate the INIT-ACK chunk in the cookie (my info) the
1299 * INIT-ACK follows the INIT chunk
1300 */
1301 initack_offset = init_offset + SCTP_SIZE32(chk_length);
1302 initack_cp = (struct sctp_init_ack_chunk *)
1303 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1304 (uint8_t *) & initack_buf);
1305 if (initack_cp == NULL) {
1306 /* could not pull INIT-ACK chunk in cookie */
1307 return (NULL);
1308 }
1309 chk_length = ntohs(initack_cp->ch.chunk_length);
1310 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1311 return (NULL);
1312 }
1313 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1314 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1315 /*
1316 * case D in Section 5.2.4 Table 2: MMAA process accordingly
1317 * to get into the OPEN state
1318 */
1319 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1320 /*-
1321 * Opps, this means that we somehow generated two vtag's
1322 * the same. I.e. we did:
1323 * Us Peer
1324 * <---INIT(tag=a)------
1325 * ----INIT-ACK(tag=t)-->
1326 * ----INIT(tag=t)------> *1
1327 * <---INIT-ACK(tag=a)---
1328 * <----CE(tag=t)------------- *2
1329 *
1330 * At point *1 we should be generating a different
1331 * tag t'. Which means we would throw away the CE and send
1332 * ours instead. Basically this is case C (throw away side).
1333 */
1334 if (how_indx < sizeof(asoc->cookie_how))
1335 asoc->cookie_how[how_indx] = 17;
1336 return (NULL);
1337
1338 }
1339 switch SCTP_GET_STATE
1340 (asoc) {
1341 case SCTP_STATE_COOKIE_WAIT:
1342 case SCTP_STATE_COOKIE_ECHOED:
1343 /*
1344 * INIT was sent but got a COOKIE_ECHO with the
1345 * correct tags... just accept it...but we must
1346 * process the init so that we can make sure we have
1347 * the right seq no's.
1348 */
1349 /* First we must process the INIT !! */
1350 retval = sctp_process_init(init_cp, stcb, net);
1351 if (retval < 0) {
1352 if (how_indx < sizeof(asoc->cookie_how))
1353 asoc->cookie_how[how_indx] = 3;
1354 return (NULL);
1355 }
1356 /* we have already processed the INIT so no problem */
1357 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1358 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1359 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1360 /* update current state */
1361 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1362 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1363 else
1364 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1365
1366 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1367 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1368 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1369 stcb->sctp_ep, stcb, asoc->primary_destination);
1370 }
1371 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1372 sctp_stop_all_cookie_timers(stcb);
1373 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1374 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1375 (inp->sctp_socket->so_qlimit == 0)
1376 ) {
1377#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1378 struct socket *so;
1379
1380#endif
1381 /*
1382 * Here is where collision would go if we
1383 * did a connect() and instead got a
1384 * init/init-ack/cookie done before the
1385 * init-ack came back..
1386 */
1387 stcb->sctp_ep->sctp_flags |=
1388 SCTP_PCB_FLAGS_CONNECTED;
1389#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1390 so = SCTP_INP_SO(stcb->sctp_ep);
1391 atomic_add_int(&stcb->asoc.refcnt, 1);
1392 SCTP_TCB_UNLOCK(stcb);
1393 SCTP_SOCKET_LOCK(so, 1);
1394 SCTP_TCB_LOCK(stcb);
1395 atomic_add_int(&stcb->asoc.refcnt, -1);
1396 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1397 SCTP_SOCKET_UNLOCK(so, 1);
1398 return (NULL);
1399 }
1400#endif
1401 soisconnected(stcb->sctp_socket);
1402#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1403 SCTP_SOCKET_UNLOCK(so, 1);
1404#endif
1405 }
1406 /* notify upper layer */
1407 *notification = SCTP_NOTIFY_ASSOC_UP;
1408 /*
1409 * since we did not send a HB make sure we don't
1410 * double things
1411 */
1412 net->hb_responded = 1;
1413 net->RTO = sctp_calculate_rto(stcb, asoc, net,
1414 &cookie->time_entered, sctp_align_unsafe_makecopy);
1415
1416 if (stcb->asoc.sctp_autoclose_ticks &&
1417 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1418 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1419 inp, stcb, NULL);
1420 }
1421 break;
1422 default:
1423 /*
1424 * we're in the OPEN state (or beyond), so peer must
1425 * have simply lost the COOKIE-ACK
1426 */
1427 break;
1428 } /* end switch */
1429 sctp_stop_all_cookie_timers(stcb);
1430 /*
1431 * We ignore the return code here.. not sure if we should
1432 * somehow abort.. but we do have an existing asoc. This
1433 * really should not fail.
1434 */
1435 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1436 init_offset + sizeof(struct sctp_init_chunk),
1437 initack_offset, sh, init_src)) {
1438 if (how_indx < sizeof(asoc->cookie_how))
1439 asoc->cookie_how[how_indx] = 4;
1440 return (NULL);
1441 }
1442 /* respond with a COOKIE-ACK */
1443 sctp_toss_old_cookies(stcb, asoc);
1444 sctp_send_cookie_ack(stcb);
1445 if (how_indx < sizeof(asoc->cookie_how))
1446 asoc->cookie_how[how_indx] = 5;
1447 return (stcb);
1448 }
1449 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1450 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1451 cookie->tie_tag_my_vtag == 0 &&
1452 cookie->tie_tag_peer_vtag == 0) {
1453 /*
1454 * case C in Section 5.2.4 Table 2: XMOO silently discard
1455 */
1456 if (how_indx < sizeof(asoc->cookie_how))
1457 asoc->cookie_how[how_indx] = 6;
1458 return (NULL);
1459 }
1460 if (ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag &&
1461 (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag ||
1462 init_cp->init.initiate_tag == 0)) {
1463 /*
1464 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1465 * should be ok, re-accept peer info
1466 */
1467 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1468 /*
1469 * Extension of case C. If we hit this, then the
1470 * random number generator returned the same vtag
1471 * when we first sent our INIT-ACK and when we later
1472 * sent our INIT. The side with the seq numbers that
1473 * are different will be the one that normnally
1474 * would have hit case C. This in effect "extends"
1475 * our vtags in this collision case to be 64 bits.
1476 * The same collision could occur aka you get both
1477 * vtag and seq number the same twice in a row.. but
1478 * is much less likely. If it did happen then we
1479 * would proceed through and bring up the assoc.. we
1480 * may end up with the wrong stream setup however..
1481 * which would be bad.. but there is no way to
1482 * tell.. until we send on a stream that does not
1483 * exist :-)
1484 */
1485 if (how_indx < sizeof(asoc->cookie_how))
1486 asoc->cookie_how[how_indx] = 7;
1487
1488 return (NULL);
1489 }
1490 if (how_indx < sizeof(asoc->cookie_how))
1491 asoc->cookie_how[how_indx] = 8;
1492 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1493 sctp_stop_all_cookie_timers(stcb);
1494 /*
1495 * since we did not send a HB make sure we don't double
1496 * things
1497 */
1498 net->hb_responded = 1;
1499 if (stcb->asoc.sctp_autoclose_ticks &&
1500 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1501 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1502 NULL);
1503 }
1504 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1505 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1506
1507 /* Note last_cwr_tsn? where is this used? */
1508 asoc->last_cwr_tsn = asoc->init_seq_number - 1;
1509 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1510 /*
1511 * Ok the peer probably discarded our data (if we
1512 * echoed a cookie+data). So anything on the
1513 * sent_queue should be marked for retransmit, we
1514 * may not get something to kick us so it COULD
1515 * still take a timeout to move these.. but it can't
1516 * hurt to mark them.
1517 */
1518 struct sctp_tmit_chunk *chk;
1519
1520 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1521 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1522 chk->sent = SCTP_DATAGRAM_RESEND;
1523 sctp_flight_size_decrease(chk);
1524 sctp_total_flight_decrease(stcb, chk);
1525 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1526 spec_flag++;
1527 }
1528 }
1529
1530 }
1531 /* process the INIT info (peer's info) */
1532 retval = sctp_process_init(init_cp, stcb, net);
1533 if (retval < 0) {
1534 if (how_indx < sizeof(asoc->cookie_how))
1535 asoc->cookie_how[how_indx] = 9;
1536 return (NULL);
1537 }
1538 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1539 init_offset + sizeof(struct sctp_init_chunk),
1540 initack_offset, sh, init_src)) {
1541 if (how_indx < sizeof(asoc->cookie_how))
1542 asoc->cookie_how[how_indx] = 10;
1543 return (NULL);
1544 }
1545 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1546 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1547 *notification = SCTP_NOTIFY_ASSOC_UP;
1548
1549 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1550 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1551 (inp->sctp_socket->so_qlimit == 0)) {
1552#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1553 struct socket *so;
1554
1555#endif
1556 stcb->sctp_ep->sctp_flags |=
1557 SCTP_PCB_FLAGS_CONNECTED;
1558#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1559 so = SCTP_INP_SO(stcb->sctp_ep);
1560 atomic_add_int(&stcb->asoc.refcnt, 1);
1561 SCTP_TCB_UNLOCK(stcb);
1562 SCTP_SOCKET_LOCK(so, 1);
1563 SCTP_TCB_LOCK(stcb);
1564 atomic_add_int(&stcb->asoc.refcnt, -1);
1565 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1566 SCTP_SOCKET_UNLOCK(so, 1);
1567 return (NULL);
1568 }
1569#endif
1570 soisconnected(stcb->sctp_socket);
1571#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1572 SCTP_SOCKET_UNLOCK(so, 1);
1573#endif
1574 }
1575 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1576 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1577 else
1578 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1579 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1580 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1581 SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1582 } else {
1583 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1584 }
1585 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1586 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1587 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1588 stcb->sctp_ep, stcb, asoc->primary_destination);
1589 }
1590 sctp_stop_all_cookie_timers(stcb);
1591 sctp_toss_old_cookies(stcb, asoc);
1592 sctp_send_cookie_ack(stcb);
1593 if (spec_flag) {
1594 /*
1595 * only if we have retrans set do we do this. What
1596 * this call does is get only the COOKIE-ACK out and
1597 * then when we return the normal call to
1598 * sctp_chunk_output will get the retrans out behind
1599 * this.
1600 */
1601 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1602 }
1603 if (how_indx < sizeof(asoc->cookie_how))
1604 asoc->cookie_how[how_indx] = 11;
1605
1606 return (stcb);
1607 }
1608 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1609 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1610 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1611 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1612 cookie->tie_tag_peer_vtag != 0) {
1613 struct sctpasochead *head;
1614
1615 /*
1616 * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1617 */
1618 /* temp code */
1619 if (how_indx < sizeof(asoc->cookie_how))
1620 asoc->cookie_how[how_indx] = 12;
1621 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1622 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1623
1624 *sac_assoc_id = sctp_get_associd(stcb);
1625 /* notify upper layer */
1626 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1627 atomic_add_int(&stcb->asoc.refcnt, 1);
1628 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1629 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1630 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1631 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1632 }
1633 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1634 SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1635 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1636 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1637 }
1638 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1639 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1640 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1641 stcb->sctp_ep, stcb, asoc->primary_destination);
1642
1643 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1644 /* move to OPEN state, if not in SHUTDOWN_SENT */
1645 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1646 }
1647 asoc->pre_open_streams =
1648 ntohs(initack_cp->init.num_outbound_streams);
1649 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1650 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1651 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1652
1653 asoc->last_cwr_tsn = asoc->init_seq_number - 1;
1654 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1655
1656 asoc->str_reset_seq_in = asoc->init_seq_number;
1657
1658 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1659 if (asoc->mapping_array) {
1660 memset(asoc->mapping_array, 0,
1661 asoc->mapping_array_size);
1662 }
1663 SCTP_TCB_UNLOCK(stcb);
1664 SCTP_INP_INFO_WLOCK();
1665 SCTP_INP_WLOCK(stcb->sctp_ep);
1666 SCTP_TCB_LOCK(stcb);
1667 atomic_add_int(&stcb->asoc.refcnt, -1);
1668 /* send up all the data */
1669 SCTP_TCB_SEND_LOCK(stcb);
1670
1671 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED);
1672 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1673 stcb->asoc.strmout[i].stream_no = i;
1674 stcb->asoc.strmout[i].next_sequence_sent = 0;
1675 stcb->asoc.strmout[i].last_msg_incomplete = 0;
1676 }
1677 /* process the INIT-ACK info (my info) */
1678 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1679 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1680
1681 /* pull from vtag hash */
1682 LIST_REMOVE(stcb, sctp_asocs);
1683 /* re-insert to new vtag position */
1684 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1685 SCTP_BASE_INFO(hashasocmark))];
1686 /*
1687 * put it in the bucket in the vtag hash of assoc's for the
1688 * system
1689 */
1690 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1691
1692 /* Is this the first restart? */
1693 if (stcb->asoc.in_restart_hash == 0) {
1694 /* Ok add it to assoc_id vtag hash */
1695 head = &SCTP_BASE_INFO(sctp_restarthash)[SCTP_PCBHASH_ASOC(stcb->asoc.assoc_id,
1696 SCTP_BASE_INFO(hashrestartmark))];
1697 LIST_INSERT_HEAD(head, stcb, sctp_tcbrestarhash);
1698 stcb->asoc.in_restart_hash = 1;
1699 }
1700 /* process the INIT info (peer's info) */
1701 SCTP_TCB_SEND_UNLOCK(stcb);
1702 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1703 SCTP_INP_INFO_WUNLOCK();
1704
1705 retval = sctp_process_init(init_cp, stcb, net);
1706 if (retval < 0) {
1707 if (how_indx < sizeof(asoc->cookie_how))
1708 asoc->cookie_how[how_indx] = 13;
1709
1710 return (NULL);
1711 }
1712 /*
1713 * since we did not send a HB make sure we don't double
1714 * things
1715 */
1716 net->hb_responded = 1;
1717
1718 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1719 init_offset + sizeof(struct sctp_init_chunk),
1720 initack_offset, sh, init_src)) {
1721 if (how_indx < sizeof(asoc->cookie_how))
1722 asoc->cookie_how[how_indx] = 14;
1723
1724 return (NULL);
1725 }
1726 /* respond with a COOKIE-ACK */
1727 sctp_stop_all_cookie_timers(stcb);
1728 sctp_toss_old_cookies(stcb, asoc);
1729 sctp_send_cookie_ack(stcb);
1730 if (how_indx < sizeof(asoc->cookie_how))
1731 asoc->cookie_how[how_indx] = 15;
1732
1733 return (stcb);
1734 }
1735 if (how_indx < sizeof(asoc->cookie_how))
1736 asoc->cookie_how[how_indx] = 16;
1737 /* all other cases... */
1738 return (NULL);
1739}
1740
1741
1742/*
1743 * handle a state cookie for a new association m: input packet mbuf chain--
1744 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1745 * and the cookie signature does not exist offset: offset into mbuf to the
1746 * cookie-echo chunk length: length of the cookie chunk to: where the init
1747 * was from returns a new TCB
1748 */
1749static struct sctp_tcb *
1750sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1751 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1752 struct sctp_inpcb *inp, struct sctp_nets **netp,
1753 struct sockaddr *init_src, int *notification,
1754 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1755 uint32_t vrf_id, uint16_t port)
1756{
1757 struct sctp_tcb *stcb;
1758 struct sctp_init_chunk *init_cp, init_buf;
1759 struct sctp_init_ack_chunk *initack_cp, initack_buf;
1760 struct sockaddr_storage sa_store;
1761 struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
1762 struct sockaddr_in *sin;
1763 struct sockaddr_in6 *sin6;
1764 struct sctp_association *asoc;
1765 int chk_length;
1766 int init_offset, initack_offset, initack_limit;
1767 int retval;
1768 int error = 0;
1769 uint32_t old_tag;
1770 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
1771
1772#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1773 struct socket *so;
1774
1775 so = SCTP_INP_SO(inp);
1776#endif
1777
1778 /*
1779 * find and validate the INIT chunk in the cookie (peer's info) the
1780 * INIT should start after the cookie-echo header struct (chunk
1781 * header, state cookie header struct)
1782 */
1783 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1784 init_cp = (struct sctp_init_chunk *)
1785 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1786 (uint8_t *) & init_buf);
1787 if (init_cp == NULL) {
1788 /* could not pull a INIT chunk in cookie */
1789 SCTPDBG(SCTP_DEBUG_INPUT1,
1790 "process_cookie_new: could not pull INIT chunk hdr\n");
1791 return (NULL);
1792 }
1793 chk_length = ntohs(init_cp->ch.chunk_length);
1794 if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1795 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
1796 return (NULL);
1797 }
1798 initack_offset = init_offset + SCTP_SIZE32(chk_length);
1799 /*
1800 * find and validate the INIT-ACK chunk in the cookie (my info) the
1801 * INIT-ACK follows the INIT chunk
1802 */
1803 initack_cp = (struct sctp_init_ack_chunk *)
1804 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1805 (uint8_t *) & initack_buf);
1806 if (initack_cp == NULL) {
1807 /* could not pull INIT-ACK chunk in cookie */
1808 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
1809 return (NULL);
1810 }
1811 chk_length = ntohs(initack_cp->ch.chunk_length);
1812 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1813 return (NULL);
1814 }
1815 /*
1816 * NOTE: We can't use the INIT_ACK's chk_length to determine the
1817 * "initack_limit" value. This is because the chk_length field
1818 * includes the length of the cookie, but the cookie is omitted when
1819 * the INIT and INIT_ACK are tacked onto the cookie...
1820 */
1821 initack_limit = offset + cookie_len;
1822
1823 /*
1824 * now that we know the INIT/INIT-ACK are in place, create a new TCB
1825 * and popluate
1826 */
1827
1828 /*
1829 * Here we do a trick, we set in NULL for the proc/thread argument.
1830 * We do this since in effect we only use the p argument when the
1831 * socket is unbound and we must do an implicit bind. Since we are
1832 * getting a cookie, we cannot be unbound.
1833 */
1834 stcb = sctp_aloc_assoc(inp, init_src, 0, &error,
1835 ntohl(initack_cp->init.initiate_tag), vrf_id,
1836 (struct thread *)NULL
1837 );
1838 if (stcb == NULL) {
1839 struct mbuf *op_err;
1840
1841 /* memory problem? */
1842 SCTPDBG(SCTP_DEBUG_INPUT1,
1843 "process_cookie_new: no room for another TCB!\n");
1844 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
1845
1846 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
1847 sh, op_err, vrf_id, port);
1848 return (NULL);
1849 }
1850 /* get the correct sctp_nets */
1851 if (netp)
1852 *netp = sctp_findnet(stcb, init_src);
1853
1854 asoc = &stcb->asoc;
1855 /* get scope variables out of cookie */
1856 asoc->ipv4_local_scope = cookie->ipv4_scope;
1857 asoc->site_scope = cookie->site_scope;
1858 asoc->local_scope = cookie->local_scope;
1859 asoc->loopback_scope = cookie->loopback_scope;
1860
1861 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
1862 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
1863 struct mbuf *op_err;
1864
1865 /*
1866 * Houston we have a problem. The EP changed while the
1867 * cookie was in flight. Only recourse is to abort the
1868 * association.
1869 */
1870 atomic_add_int(&stcb->asoc.refcnt, 1);
1871 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
1872 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
1873 sh, op_err, vrf_id, port);
1874#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1875 SCTP_TCB_UNLOCK(stcb);
1876 SCTP_SOCKET_LOCK(so, 1);
1877 SCTP_TCB_LOCK(stcb);
1878#endif
1879 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
1880 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1881#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1882 SCTP_SOCKET_UNLOCK(so, 1);
1883#endif
1884 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1885 return (NULL);
1886 }
1887 /* process the INIT-ACK info (my info) */
1888 old_tag = asoc->my_vtag;
1889 asoc->assoc_id = asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1890 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1891 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1892 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1893 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1894 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1895 asoc->last_cwr_tsn = asoc->init_seq_number - 1;
1896 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1897 asoc->str_reset_seq_in = asoc->init_seq_number;
1898
1899 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1900
1901 /* process the INIT info (peer's info) */
1902 if (netp)
1903 retval = sctp_process_init(init_cp, stcb, *netp);
1904 else
1905 retval = 0;
1906 if (retval < 0) {
1907 atomic_add_int(&stcb->asoc.refcnt, 1);
1908#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1909 SCTP_TCB_UNLOCK(stcb);
1910 SCTP_SOCKET_LOCK(so, 1);
1911 SCTP_TCB_LOCK(stcb);
1912#endif
1913 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1914#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1915 SCTP_SOCKET_UNLOCK(so, 1);
1916#endif
1917 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1918 return (NULL);
1919 }
1920 /* load all addresses */
1921 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1922 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
1923 init_src)) {
1924 atomic_add_int(&stcb->asoc.refcnt, 1);
1925#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1926 SCTP_TCB_UNLOCK(stcb);
1927 SCTP_SOCKET_LOCK(so, 1);
1928 SCTP_TCB_LOCK(stcb);
1929#endif
1930 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1931#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1932 SCTP_SOCKET_UNLOCK(so, 1);
1933#endif
1934 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1935 return (NULL);
1936 }
1937 /*
1938 * verify any preceding AUTH chunk that was skipped
1939 */
1940 /* pull the local authentication parameters from the cookie/init-ack */
1941 sctp_auth_get_cookie_params(stcb, m,
1942 initack_offset + sizeof(struct sctp_init_ack_chunk),
1943 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
1944 if (auth_skipped) {
1945 struct sctp_auth_chunk *auth;
1946
1947 auth = (struct sctp_auth_chunk *)
1948 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
1949 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
1950 /* auth HMAC failed, dump the assoc and packet */
1951 SCTPDBG(SCTP_DEBUG_AUTH1,
1952 "COOKIE-ECHO: AUTH failed\n");
1953 atomic_add_int(&stcb->asoc.refcnt, 1);
1954#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1955 SCTP_TCB_UNLOCK(stcb);
1956 SCTP_SOCKET_LOCK(so, 1);
1957 SCTP_TCB_LOCK(stcb);
1958#endif
1959 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
1960#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1961 SCTP_SOCKET_UNLOCK(so, 1);
1962#endif
1963 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1964 return (NULL);
1965 } else {
1966 /* remaining chunks checked... good to go */
1967 stcb->asoc.authenticated = 1;
1968 }
1969 }
1970 /* update current state */
1971 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
1972 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1973 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1974 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1975 stcb->sctp_ep, stcb, asoc->primary_destination);
1976 }
1977 sctp_stop_all_cookie_timers(stcb);
1978 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
1979 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1980
1981 /*
1982 * if we're doing ASCONFs, check to see if we have any new local
1983 * addresses that need to get added to the peer (eg. addresses
1984 * changed while cookie echo in flight). This needs to be done
1985 * after we go to the OPEN state to do the correct asconf
1986 * processing. else, make sure we have the correct addresses in our
1987 * lists
1988 */
1989
1990 /* warning, we re-use sin, sin6, sa_store here! */
1991 /* pull in local_address (our "from" address) */
1992 if (cookie->laddr_type == SCTP_IPV4_ADDRESS) {
1993 /* source addr is IPv4 */
1994 sin = (struct sockaddr_in *)initack_src;
1995 memset(sin, 0, sizeof(*sin));
1996 sin->sin_family = AF_INET;
1997 sin->sin_len = sizeof(struct sockaddr_in);
1998 sin->sin_addr.s_addr = cookie->laddress[0];
1999 } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) {
2000 /* source addr is IPv6 */
2001 sin6 = (struct sockaddr_in6 *)initack_src;
2002 memset(sin6, 0, sizeof(*sin6));
2003 sin6->sin6_family = AF_INET6;
2004 sin6->sin6_len = sizeof(struct sockaddr_in6);
2005 sin6->sin6_scope_id = cookie->scope_id;
2006 memcpy(&sin6->sin6_addr, cookie->laddress,
2007 sizeof(sin6->sin6_addr));
2008 } else {
2009 atomic_add_int(&stcb->asoc.refcnt, 1);
2010#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2011 SCTP_TCB_UNLOCK(stcb);
2012 SCTP_SOCKET_LOCK(so, 1);
2013 SCTP_TCB_LOCK(stcb);
2014#endif
2015 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2016#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2017 SCTP_SOCKET_UNLOCK(so, 1);
2018#endif
2019 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2020 return (NULL);
2021 }
2022
2023 /* set up to notify upper layer */
2024 *notification = SCTP_NOTIFY_ASSOC_UP;
2025 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2026 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2027 (inp->sctp_socket->so_qlimit == 0)) {
2028 /*
2029 * This is an endpoint that called connect() how it got a
2030 * cookie that is NEW is a bit of a mystery. It must be that
2031 * the INIT was sent, but before it got there.. a complete
2032 * INIT/INIT-ACK/COOKIE arrived. But of course then it
2033 * should have went to the other code.. not here.. oh well..
2034 * a bit of protection is worth having..
2035 */
2036 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2037#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2038 atomic_add_int(&stcb->asoc.refcnt, 1);
2039 SCTP_TCB_UNLOCK(stcb);
2040 SCTP_SOCKET_LOCK(so, 1);
2041 SCTP_TCB_LOCK(stcb);
2042 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2043 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2044 SCTP_SOCKET_UNLOCK(so, 1);
2045 return (NULL);
2046 }
2047#endif
2048 soisconnected(stcb->sctp_socket);
2049#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2050 SCTP_SOCKET_UNLOCK(so, 1);
2051#endif
2052 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2053 (inp->sctp_socket->so_qlimit)) {
2054 /*
2055 * We don't want to do anything with this one. Since it is
2056 * the listening guy. The timer will get started for
2057 * accepted connections in the caller.
2058 */
2059 ;
2060 }
2061 /* since we did not send a HB make sure we don't double things */
2062 if ((netp) && (*netp))
2063 (*netp)->hb_responded = 1;
2064
2065 if (stcb->asoc.sctp_autoclose_ticks &&
2066 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2067 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2068 }
2069 /* calculate the RTT */
2070 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2071 if ((netp) && (*netp)) {
2072 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2073 &cookie->time_entered, sctp_align_unsafe_makecopy);
2074 }
2075 /* respond with a COOKIE-ACK */
2076 sctp_send_cookie_ack(stcb);
2077
2078 /*
2079 * check the address lists for any ASCONFs that need to be sent
2080 * AFTER the cookie-ack is sent
2081 */
2082 sctp_check_address_list(stcb, m,
2083 initack_offset + sizeof(struct sctp_init_ack_chunk),
2084 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2085 initack_src, cookie->local_scope, cookie->site_scope,
2086 cookie->ipv4_scope, cookie->loopback_scope);
2087
2088
2089 return (stcb);
2090}
2091
2092
2093/*
2094 * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2095 * existing (non-NULL) TCB
2096 */
2097static struct mbuf *
2098sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2099 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2100 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2101 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2102 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port)
2103{
2104 struct sctp_state_cookie *cookie;
2105 struct sockaddr_in6 sin6;
2106 struct sockaddr_in sin;
2107 struct sctp_tcb *l_stcb = *stcb;
2108 struct sctp_inpcb *l_inp;
2109 struct sockaddr *to;
2110 sctp_assoc_t sac_restart_id;
2111 struct sctp_pcb *ep;
2112 struct mbuf *m_sig;
2113 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2114 uint8_t *sig;
2115 uint8_t cookie_ok = 0;
2116 unsigned int size_of_pkt, sig_offset, cookie_offset;
2117 unsigned int cookie_len;
2118 struct timeval now;
2119 struct timeval time_expires;
2120 struct sockaddr_storage dest_store;
2121 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
2122 struct ip *iph;
2123 int notification = 0;
2124 struct sctp_nets *netl;
2125 int had_a_existing_tcb = 0;
2126
2127 SCTPDBG(SCTP_DEBUG_INPUT2,
2128 "sctp_handle_cookie: handling COOKIE-ECHO\n");
2129
2130 if (inp_p == NULL) {
2131 return (NULL);
2132 }
2133 /* First get the destination address setup too. */
2134 iph = mtod(m, struct ip *);
2135 switch (iph->ip_v) {
2136 case IPVERSION:
2137 {
2138 /* its IPv4 */
2139 struct sockaddr_in *lsin;
2140
2141 lsin = (struct sockaddr_in *)(localep_sa);
2142 memset(lsin, 0, sizeof(*lsin));
2143 lsin->sin_family = AF_INET;
2144 lsin->sin_len = sizeof(*lsin);
2145 lsin->sin_port = sh->dest_port;
2146 lsin->sin_addr.s_addr = iph->ip_dst.s_addr;
2147 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph);
2148 break;
2149 }
2150#ifdef INET6
2151 case IPV6_VERSION >> 4:
2152 {
2153 /* its IPv6 */
2154 struct ip6_hdr *ip6;
2155 struct sockaddr_in6 *lsin6;
2156
2157 lsin6 = (struct sockaddr_in6 *)(localep_sa);
2158 memset(lsin6, 0, sizeof(*lsin6));
2159 lsin6->sin6_family = AF_INET6;
2160 lsin6->sin6_len = sizeof(struct sockaddr_in6);
2161 ip6 = mtod(m, struct ip6_hdr *);
2162 lsin6->sin6_port = sh->dest_port;
2163 lsin6->sin6_addr = ip6->ip6_dst;
2164 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen;
2165 break;
2166 }
2167#endif
2168 default:
2169 return (NULL);
2170 }
2171
2172 cookie = &cp->cookie;
2173 cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2174 cookie_len = ntohs(cp->ch.chunk_length);
2175
2176 if ((cookie->peerport != sh->src_port) &&
2177 (cookie->myport != sh->dest_port) &&
2178 (cookie->my_vtag != sh->v_tag)) {
2179 /*
2180 * invalid ports or bad tag. Note that we always leave the
2181 * v_tag in the header in network order and when we stored
2182 * it in the my_vtag slot we also left it in network order.
2183 * This maintains the match even though it may be in the
2184 * opposite byte order of the machine :->
2185 */
2186 return (NULL);
2187 }
2188 if (cookie_len > size_of_pkt ||
2189 cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2190 sizeof(struct sctp_init_chunk) +
2191 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2192 /* cookie too long! or too small */
2193 return (NULL);
2194 }
2195 /*
2196 * split off the signature into its own mbuf (since it should not be
2197 * calculated in the sctp_hmac_m() call).
2198 */
2199 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2200 if (sig_offset > size_of_pkt) {
2201 /* packet not correct size! */
2202 /* XXX this may already be accounted for earlier... */
2203 return (NULL);
2204 }
2205 m_sig = m_split(m, sig_offset, M_DONTWAIT);
2206 if (m_sig == NULL) {
2207 /* out of memory or ?? */
2208 return (NULL);
2209 }
2210#ifdef SCTP_MBUF_LOGGING
2211 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2212 struct mbuf *mat;
2213
2214 mat = m_sig;
2215 while (mat) {
2216 if (SCTP_BUF_IS_EXTENDED(mat)) {
2217 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2218 }
2219 mat = SCTP_BUF_NEXT(mat);
2220 }
2221 }
2222#endif
2223
2224 /*
2225 * compute the signature/digest for the cookie
2226 */
2227 ep = &(*inp_p)->sctp_ep;
2228 l_inp = *inp_p;
2229 if (l_stcb) {
2230 SCTP_TCB_UNLOCK(l_stcb);
2231 }
2232 SCTP_INP_RLOCK(l_inp);
2233 if (l_stcb) {
2234 SCTP_TCB_LOCK(l_stcb);
2235 }
2236 /* which cookie is it? */
2237 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2238 (ep->current_secret_number != ep->last_secret_number)) {
2239 /* it's the old cookie */
2240 (void)sctp_hmac_m(SCTP_HMAC,
2241 (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2242 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2243 } else {
2244 /* it's the current cookie */
2245 (void)sctp_hmac_m(SCTP_HMAC,
2246 (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2247 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2248 }
2249 /* get the signature */
2250 SCTP_INP_RUNLOCK(l_inp);
2251 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2252 if (sig == NULL) {
2253 /* couldn't find signature */
2254 sctp_m_freem(m_sig);
2255 return (NULL);
2256 }
2257 /* compare the received digest with the computed digest */
2258 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2259 /* try the old cookie? */
2260 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2261 (ep->current_secret_number != ep->last_secret_number)) {
2262 /* compute digest with old */
2263 (void)sctp_hmac_m(SCTP_HMAC,
2264 (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2265 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2266 /* compare */
2267 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2268 cookie_ok = 1;
2269 }
2270 } else {
2271 cookie_ok = 1;
2272 }
2273
2274 /*
2275 * Now before we continue we must reconstruct our mbuf so that
2276 * normal processing of any other chunks will work.
2277 */
2278 {
2279 struct mbuf *m_at;
2280
2281 m_at = m;
2282 while (SCTP_BUF_NEXT(m_at) != NULL) {
2283 m_at = SCTP_BUF_NEXT(m_at);
2284 }
2285 SCTP_BUF_NEXT(m_at) = m_sig;
2286 }
2287
2288 if (cookie_ok == 0) {
2289 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2290 SCTPDBG(SCTP_DEBUG_INPUT2,
2291 "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2292 (uint32_t) offset, cookie_offset, sig_offset);
2293 return (NULL);
2294 }
2295 /*
2296 * check the cookie timestamps to be sure it's not stale
2297 */
2298 (void)SCTP_GETTIME_TIMEVAL(&now);
2299 /* Expire time is in Ticks, so we convert to seconds */
2300 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2301 time_expires.tv_usec = cookie->time_entered.tv_usec;
2302 if (timevalcmp(&now, &time_expires, >)) {
2303 /* cookie is stale! */
2304 struct mbuf *op_err;
2305 struct sctp_stale_cookie_msg *scm;
2306 uint32_t tim;
2307
2308 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2309 0, M_DONTWAIT, 1, MT_DATA);
2310 if (op_err == NULL) {
2311 /* FOOBAR */
2312 return (NULL);
2313 }
2314 /* pre-reserve some space */
2315#ifdef INET6
2316 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
2317#else
2318 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
2319#endif
2320 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
2321 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
2322
2323 /* Set the len */
2324 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2325 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2326 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2327 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2328 (sizeof(uint32_t))));
2329 /* seconds to usec */
2330 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2331 /* add in usec */
2332 if (tim == 0)
2333 tim = now.tv_usec - cookie->time_entered.tv_usec;
2334 scm->time_usec = htonl(tim);
2335 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag,
2336 vrf_id, port);
2337 return (NULL);
2338 }
2339 /*
2340 * Now we must see with the lookup address if we have an existing
2341 * asoc. This will only happen if we were in the COOKIE-WAIT state
2342 * and a INIT collided with us and somewhere the peer sent the
2343 * cookie on another address besides the single address our assoc
2344 * had for him. In this case we will have one of the tie-tags set at
2345 * least AND the address field in the cookie can be used to look it
2346 * up.
2347 */
2348 to = NULL;
2349 if (cookie->addr_type == SCTP_IPV6_ADDRESS) {
2350 memset(&sin6, 0, sizeof(sin6));
2351 sin6.sin6_family = AF_INET6;
2352 sin6.sin6_len = sizeof(sin6);
2353 sin6.sin6_port = sh->src_port;
2354 sin6.sin6_scope_id = cookie->scope_id;
2355 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2356 sizeof(sin6.sin6_addr.s6_addr));
2357 to = (struct sockaddr *)&sin6;
2358 } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) {
2359 memset(&sin, 0, sizeof(sin));
2360 sin.sin_family = AF_INET;
2361 sin.sin_len = sizeof(sin);
2362 sin.sin_port = sh->src_port;
2363 sin.sin_addr.s_addr = cookie->address[0];
2364 to = (struct sockaddr *)&sin;
2365 } else {
2366 /* This should not happen */
2367 return (NULL);
2368 }
2369 if ((*stcb == NULL) && to) {
2370 /* Yep, lets check */
2371 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
2372 if (*stcb == NULL) {
2373 /*
2374 * We should have only got back the same inp. If we
2375 * got back a different ep we have a problem. The
2376 * original findep got back l_inp and now
2377 */
2378 if (l_inp != *inp_p) {
2379 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2380 }
2381 } else {
2382 if (*locked_tcb == NULL) {
2383 /*
2384 * In this case we found the assoc only
2385 * after we locked the create lock. This
2386 * means we are in a colliding case and we
2387 * must make sure that we unlock the tcb if
2388 * its one of the cases where we throw away
2389 * the incoming packets.
2390 */
2391 *locked_tcb = *stcb;
2392
2393 /*
2394 * We must also increment the inp ref count
2395 * since the ref_count flags was set when we
2396 * did not find the TCB, now we found it
2397 * which reduces the refcount.. we must
2398 * raise it back out to balance it all :-)
2399 */
2400 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2401 if ((*stcb)->sctp_ep != l_inp) {
2402 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2403 (*stcb)->sctp_ep, l_inp);
2404 }
2405 }
2406 }
2407 }
2408 if (to == NULL)
2409 return (NULL);
2410
2411 cookie_len -= SCTP_SIGNATURE_SIZE;
2412 if (*stcb == NULL) {
2413 /* this is the "normal" case... get a new TCB */
2414 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
2415 cookie_len, *inp_p, netp, to, &notification,
2416 auth_skipped, auth_offset, auth_len, vrf_id, port);
2417 } else {
2418 /* this is abnormal... cookie-echo on existing TCB */
2419 had_a_existing_tcb = 1;
2420 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
2421 cookie, cookie_len, *inp_p, *stcb, *netp, to,
2422 &notification, &sac_restart_id, vrf_id);
2423 }
2424
2425 if (*stcb == NULL) {
2426 /* still no TCB... must be bad cookie-echo */
2427 return (NULL);
2428 }
2429 /*
2430 * Ok, we built an association so confirm the address we sent the
2431 * INIT-ACK to.
2432 */
2433 netl = sctp_findnet(*stcb, to);
2434 /*
2435 * This code should in theory NOT run but
2436 */
2437 if (netl == NULL) {
2438 /* TSNH! Huh, why do I need to add this address here? */
2439 int ret;
2440
2441 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE,
2442 SCTP_IN_COOKIE_PROC);
2443 netl = sctp_findnet(*stcb, to);
2444 }
2445 if (netl) {
2446 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2447 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2448 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2449 netl);
2450 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2451 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2452 }
2453 }
2454 if (*stcb) {
2455 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p,
2456 *stcb, NULL);
2457 }
2458 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2459 if (!had_a_existing_tcb ||
2460 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2461 /*
2462 * If we have a NEW cookie or the connect never
2463 * reached the connected state during collision we
2464 * must do the TCP accept thing.
2465 */
2466 struct socket *so, *oso;
2467 struct sctp_inpcb *inp;
2468
2469 if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2470 /*
2471 * For a restart we will keep the same
2472 * socket, no need to do anything. I THINK!!
2473 */
2474 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED);
2475 return (m);
2476 }
2477 oso = (*inp_p)->sctp_socket;
2478 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2479 SCTP_TCB_UNLOCK((*stcb));
2480 so = sonewconn(oso, 0
2481 );
2482 SCTP_TCB_LOCK((*stcb));
2483 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2484
2485 if (so == NULL) {
2486 struct mbuf *op_err;
2487
2488#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2489 struct socket *pcb_so;
2490
2491#endif
2492 /* Too many sockets */
2493 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2494 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2495 sctp_abort_association(*inp_p, NULL, m, iphlen,
2496 sh, op_err, vrf_id, port);
2497#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2498 pcb_so = SCTP_INP_SO(*inp_p);
2499 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2500 SCTP_TCB_UNLOCK((*stcb));
2501 SCTP_SOCKET_LOCK(pcb_so, 1);
2502 SCTP_TCB_LOCK((*stcb));
2503 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2504#endif
2505 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2506#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2507 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2508#endif
2509 return (NULL);
2510 }
2511 inp = (struct sctp_inpcb *)so->so_pcb;
2512 SCTP_INP_INCR_REF(inp);
2513 /*
2514 * We add the unbound flag here so that if we get an
2515 * soabort() before we get the move_pcb done, we
2516 * will properly cleanup.
2517 */
2518 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2519 SCTP_PCB_FLAGS_CONNECTED |
2520 SCTP_PCB_FLAGS_IN_TCPPOOL |
2521 SCTP_PCB_FLAGS_UNBOUND |
2522 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2523 SCTP_PCB_FLAGS_DONT_WAKE);
2524 inp->sctp_features = (*inp_p)->sctp_features;
2525 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2526 inp->sctp_socket = so;
2527 inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2528 inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2529 inp->sctp_context = (*inp_p)->sctp_context;
2530 inp->inp_starting_point_for_iterator = NULL;
2531 /*
2532 * copy in the authentication parameters from the
2533 * original endpoint
2534 */
2535 if (inp->sctp_ep.local_hmacs)
2536 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2537 inp->sctp_ep.local_hmacs =
2538 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2539 if (inp->sctp_ep.local_auth_chunks)
2540 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2541 inp->sctp_ep.local_auth_chunks =
2542 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2543 (void)sctp_copy_skeylist(&(*inp_p)->sctp_ep.shared_keys,
2544 &inp->sctp_ep.shared_keys);
2545
2546 /*
2547 * Now we must move it from one hash table to
2548 * another and get the tcb in the right place.
2549 */
2550 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2551
2552 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2553 SCTP_TCB_UNLOCK((*stcb));
2554
2555 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2556 0);
2557 SCTP_TCB_LOCK((*stcb));
2558 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2559
2560
2561 /*
2562 * now we must check to see if we were aborted while
2563 * the move was going on and the lock/unlock
2564 * happened.
2565 */
2566 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2567 /*
2568 * yep it was, we leave the assoc attached
2569 * to the socket since the sctp_inpcb_free()
2570 * call will send an abort for us.
2571 */
2572 SCTP_INP_DECR_REF(inp);
2573 return (NULL);
2574 }
2575 SCTP_INP_DECR_REF(inp);
2576 /* Switch over to the new guy */
2577 *inp_p = inp;
2578 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2579
2580 /*
2581 * Pull it from the incomplete queue and wake the
2582 * guy
2583 */
2584#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2585 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2586 SCTP_TCB_UNLOCK((*stcb));
2587 SCTP_SOCKET_LOCK(so, 1);
2588#endif
2589 soisconnected(so);
2590#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2591 SCTP_TCB_LOCK((*stcb));
2592 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2593 SCTP_SOCKET_UNLOCK(so, 1);
2594#endif
2595 return (m);
2596 }
2597 }
2598 if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
2599 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2600 }
2601 return (m);
2602}
2603
2604static void
2605sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp,
2606 struct sctp_tcb *stcb, struct sctp_nets *net)
2607{
2608 /* cp must not be used, others call this without a c-ack :-) */
2609 struct sctp_association *asoc;
2610
2611 SCTPDBG(SCTP_DEBUG_INPUT2,
2612 "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2613 if (stcb == NULL)
2614 return;
2615
2616 asoc = &stcb->asoc;
2617
2618 sctp_stop_all_cookie_timers(stcb);
2619 /* process according to association state */
2620 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2621 /* state change only needed when I am in right state */
2622 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2623 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2624 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2625 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2626 stcb->sctp_ep, stcb, asoc->primary_destination);
2627
2628 }
2629 /* update RTO */
2630 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2631 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2632 if (asoc->overall_error_count == 0) {
2633 net->RTO = sctp_calculate_rto(stcb, asoc, net,
2634 &asoc->time_entered, sctp_align_safe_nocopy);
2635 }
2636 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2637 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2638 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2639 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2640#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2641 struct socket *so;
2642
2643#endif
2644 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2645#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2646 so = SCTP_INP_SO(stcb->sctp_ep);
2647 atomic_add_int(&stcb->asoc.refcnt, 1);
2648 SCTP_TCB_UNLOCK(stcb);
2649 SCTP_SOCKET_LOCK(so, 1);
2650 SCTP_TCB_LOCK(stcb);
2651 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2652 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2653 SCTP_SOCKET_UNLOCK(so, 1);
2654 return;
2655 }
2656#endif
2657 soisconnected(stcb->sctp_socket);
2658#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2659 SCTP_SOCKET_UNLOCK(so, 1);
2660#endif
2661 }
2662 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2663 stcb, net);
2664 /*
2665 * since we did not send a HB make sure we don't double
2666 * things
2667 */
2668 net->hb_responded = 1;
2669
2670 if (stcb->asoc.sctp_autoclose_ticks &&
2671 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2672 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2673 stcb->sctp_ep, stcb, NULL);
2674 }
2675 /*
2676 * send ASCONF if parameters are pending and ASCONFs are
2677 * allowed (eg. addresses changed when init/cookie echo were
2678 * in flight)
2679 */
2680 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2681 (stcb->asoc.peer_supports_asconf) &&
2682 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2683#ifdef SCTP_TIMER_BASED_ASCONF
2684 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2685 stcb->sctp_ep, stcb,
2686 stcb->asoc.primary_destination);
2687#else
2688 sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2689 SCTP_ADDR_NOT_LOCKED);
2690#endif
2691 }
2692 }
2693 /* Toss the cookie if I can */
2694 sctp_toss_old_cookies(stcb, asoc);
2695 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2696 /* Restart the timer if we have pending data */
2697 struct sctp_tmit_chunk *chk;
2698
2699 chk = TAILQ_FIRST(&asoc->sent_queue);
2700 if (chk) {
2701 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
2702 stcb, chk->whoTo);
2703 }
2704 }
2705}
2706
2707static void
2708sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2709 struct sctp_tcb *stcb)
2710{
2711 struct sctp_nets *net;
2712 struct sctp_tmit_chunk *lchk;
2713 uint32_t tsn;
2714
2715 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) {
2716 return;
2717 }
2718 SCTP_STAT_INCR(sctps_recvecne);
2719 tsn = ntohl(cp->tsn);
2720 /* ECN Nonce stuff: need a resync and disable the nonce sum check */
2721 /* Also we make sure we disable the nonce_wait */
2722 lchk = TAILQ_FIRST(&stcb->asoc.send_queue);
2723 if (lchk == NULL) {
2724 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq;
2725 } else {
2726 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq;
2727 }
2728 stcb->asoc.nonce_wait_for_ecne = 0;
2729 stcb->asoc.nonce_sum_check = 0;
2730
2731 /* Find where it was sent, if possible */
2732 net = NULL;
2733 lchk = TAILQ_FIRST(&stcb->asoc.sent_queue);
2734 while (lchk) {
2735 if (lchk->rec.data.TSN_seq == tsn) {
2736 net = lchk->whoTo;
2737 break;
2738 }
2739 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ))
2740 break;
2741 lchk = TAILQ_NEXT(lchk, sctp_next);
2742 }
2743 if (net == NULL)
2744 /* default is we use the primary */
2745 net = stcb->asoc.primary_destination;
2746
2747 if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) {
2748 /*
2749 * JRS - Use the congestion control given in the pluggable
2750 * CC module
2751 */
2752 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net);
2753 /*
2754 * we reduce once every RTT. So we will only lower cwnd at
2755 * the next sending seq i.e. the resync_tsn.
2756 */
2757 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn;
2758 }
2759 /*
2760 * We always send a CWR this way if our previous one was lost our
2761 * peer will get an update, or if it is not time again to reduce we
2762 * still get the cwr to the peer.
2763 */
2764 sctp_send_cwr(stcb, net, tsn);
2765}
2766
2767static void
2768sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb)
2769{
2770 /*
2771 * Here we get a CWR from the peer. We must look in the outqueue and
2772 * make sure that we have a covered ECNE in teh control chunk part.
2773 * If so remove it.
2774 */
2775 struct sctp_tmit_chunk *chk;
2776 struct sctp_ecne_chunk *ecne;
2777
2778 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
2779 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
2780 continue;
2781 }
2782 /*
2783 * Look for and remove if it is the right TSN. Since there
2784 * is only ONE ECNE on the control queue at any one time we
2785 * don't need to worry about more than one!
2786 */
2787 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
2788 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn),
2789 MAX_TSN) || (cp->tsn == ecne->tsn)) {
2790 /* this covers this ECNE, we can remove it */
2791 stcb->asoc.ecn_echo_cnt_onq--;
2792 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
2793 sctp_next);
2794 if (chk->data) {
2795 sctp_m_freem(chk->data);
2796 chk->data = NULL;
2797 }
2798 stcb->asoc.ctrl_queue_cnt--;
2799 sctp_free_a_chunk(stcb, chk);
2800 break;
2801 }
2802 }
2803}
2804
2805static void
2806sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp,
2807 struct sctp_tcb *stcb, struct sctp_nets *net)
2808{
2809 struct sctp_association *asoc;
2810
2811#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2812 struct socket *so;
2813
2814#endif
2815
2816 SCTPDBG(SCTP_DEBUG_INPUT2,
2817 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
2818 if (stcb == NULL)
2819 return;
2820
2821 asoc = &stcb->asoc;
2822 /* process according to association state */
2823 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
2824 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
2825 SCTPDBG(SCTP_DEBUG_INPUT2,
2826 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
2827 SCTP_TCB_UNLOCK(stcb);
2828 return;
2829 }
2830 /* notify upper layer protocol */
2831 if (stcb->sctp_socket) {
2832 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2833 /* are the queues empty? they should be */
2834 if (!TAILQ_EMPTY(&asoc->send_queue) ||
2835 !TAILQ_EMPTY(&asoc->sent_queue) ||
2836 !TAILQ_EMPTY(&asoc->out_wheel)) {
2837 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED);
2838 }
2839 }
2840 /* stop the timer */
2841 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2842 SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
2843 /* free the TCB */
2844 SCTPDBG(SCTP_DEBUG_INPUT2,
2845 "sctp_handle_shutdown_complete: calls free-asoc\n");
2846#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2847 so = SCTP_INP_SO(stcb->sctp_ep);
2848 atomic_add_int(&stcb->asoc.refcnt, 1);
2849 SCTP_TCB_UNLOCK(stcb);
2850 SCTP_SOCKET_LOCK(so, 1);
2851 SCTP_TCB_LOCK(stcb);
2852 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2853#endif
2854 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2855#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2856 SCTP_SOCKET_UNLOCK(so, 1);
2857#endif
2858 return;
2859}
2860
2861static int
2862process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
2863 struct sctp_nets *net, uint8_t flg)
2864{
2865 switch (desc->chunk_type) {
2866 case SCTP_DATA:
2867 /* find the tsn to resend (possibly */
2868 {
2869 uint32_t tsn;
2870 struct sctp_tmit_chunk *tp1;
2871
2872 tsn = ntohl(desc->tsn_ifany);
2873 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
2874 while (tp1) {
2875 if (tp1->rec.data.TSN_seq == tsn) {
2876 /* found it */
2877 break;
2878 }
2879 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn,
2880 MAX_TSN)) {
2881 /* not found */
2882 tp1 = NULL;
2883 break;
2884 }
2885 tp1 = TAILQ_NEXT(tp1, sctp_next);
2886 }
2887 if (tp1 == NULL) {
2888 /*
2889 * Do it the other way , aka without paying
2890 * attention to queue seq order.
2891 */
2892 SCTP_STAT_INCR(sctps_pdrpdnfnd);
2893 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
2894 while (tp1) {
2895 if (tp1->rec.data.TSN_seq == tsn) {
2896 /* found it */
2897 break;
2898 }
2899 tp1 = TAILQ_NEXT(tp1, sctp_next);
2900 }
2901 }
2902 if (tp1 == NULL) {
2903 SCTP_STAT_INCR(sctps_pdrptsnnf);
2904 }
2905 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
2906 uint8_t *ddp;
2907
2908 if ((stcb->asoc.peers_rwnd == 0) &&
2909 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
2910 SCTP_STAT_INCR(sctps_pdrpdiwnp);
2911 return (0);
2912 }
2913 if (stcb->asoc.peers_rwnd == 0 &&
2914 (flg & SCTP_FROM_MIDDLE_BOX)) {
2915 SCTP_STAT_INCR(sctps_pdrpdizrw);
2916 return (0);
2917 }
2918 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
2919 sizeof(struct sctp_data_chunk));
2920 {
2921 unsigned int iii;
2922
2923 for (iii = 0; iii < sizeof(desc->data_bytes);
2924 iii++) {
2925 if (ddp[iii] != desc->data_bytes[iii]) {
2926 SCTP_STAT_INCR(sctps_pdrpbadd);
2927 return (-1);
2928 }
2929 }
2930 }
2931 /*
2932 * We zero out the nonce so resync not
2933 * needed
2934 */
2935 tp1->rec.data.ect_nonce = 0;
2936
2937 if (tp1->do_rtt) {
2938 /*
2939 * this guy had a RTO calculation
2940 * pending on it, cancel it
2941 */
2942 tp1->do_rtt = 0;
2943 }
2944 SCTP_STAT_INCR(sctps_pdrpmark);
2945 if (tp1->sent != SCTP_DATAGRAM_RESEND)
2946 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
2947 tp1->sent = SCTP_DATAGRAM_RESEND;
2948 /*
2949 * mark it as if we were doing a FR, since
2950 * we will be getting gap ack reports behind
2951 * the info from the router.
2952 */
2953 tp1->rec.data.doing_fast_retransmit = 1;
2954 /*
2955 * mark the tsn with what sequences can
2956 * cause a new FR.
2957 */
2958 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
2959 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
2960 } else {
2961 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
2962 }
2963
2964 /* restart the timer */
2965 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
2966 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
2967 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
2968 stcb, tp1->whoTo);
2969
2970 /* fix counts and things */
2971 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
2972 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
2973 tp1->whoTo->flight_size,
2974 tp1->book_size,
2975 (uintptr_t) stcb,
2976 tp1->rec.data.TSN_seq);
2977 }
2978 sctp_flight_size_decrease(tp1);
2979 sctp_total_flight_decrease(stcb, tp1);
2980 } {
2981 /* audit code */
2982 unsigned int audit;
2983
2984 audit = 0;
2985 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
2986 if (tp1->sent == SCTP_DATAGRAM_RESEND)
2987 audit++;
2988 }
2989 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
2990 sctp_next) {
2991 if (tp1->sent == SCTP_DATAGRAM_RESEND)
2992 audit++;
2993 }
2994 if (audit != stcb->asoc.sent_queue_retran_cnt) {
2995 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
2996 audit, stcb->asoc.sent_queue_retran_cnt);
2997#ifndef SCTP_AUDITING_ENABLED
2998 stcb->asoc.sent_queue_retran_cnt = audit;
2999#endif
3000 }
3001 }
3002 }
3003 break;
3004 case SCTP_ASCONF:
3005 {
3006 struct sctp_tmit_chunk *asconf;
3007
3008 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3009 sctp_next) {
3010 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3011 break;
3012 }
3013 }
3014 if (asconf) {
3015 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3016 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3017 asconf->sent = SCTP_DATAGRAM_RESEND;
3018 asconf->snd_count--;
3019 }
3020 }
3021 break;
3022 case SCTP_INITIATION:
3023 /* resend the INIT */
3024 stcb->asoc.dropped_special_cnt++;
3025 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3026 /*
3027 * If we can get it in, in a few attempts we do
3028 * this, otherwise we let the timer fire.
3029 */
3030 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3031 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3032 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3033 }
3034 break;
3035 case SCTP_SELECTIVE_ACK:
3036 /* resend the sack */
3037 sctp_send_sack(stcb);
3038 break;
3039 case SCTP_HEARTBEAT_REQUEST:
3040 /* resend a demand HB */
3041 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3042 /*
3043 * Only retransmit if we KNOW we wont destroy the
3044 * tcb
3045 */
3046 (void)sctp_send_hb(stcb, 1, net);
3047 }
3048 break;
3049 case SCTP_SHUTDOWN:
3050 sctp_send_shutdown(stcb, net);
3051 break;
3052 case SCTP_SHUTDOWN_ACK:
3053 sctp_send_shutdown_ack(stcb, net);
3054 break;
3055 case SCTP_COOKIE_ECHO:
3056 {
3057 struct sctp_tmit_chunk *cookie;
3058
3059 cookie = NULL;
3060 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3061 sctp_next) {
3062 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3063 break;
3064 }
3065 }
3066 if (cookie) {
3067 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3068 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3069 cookie->sent = SCTP_DATAGRAM_RESEND;
3070 sctp_stop_all_cookie_timers(stcb);
3071 }
3072 }
3073 break;
3074 case SCTP_COOKIE_ACK:
3075 sctp_send_cookie_ack(stcb);
3076 break;
3077 case SCTP_ASCONF_ACK:
3078 /* resend last asconf ack */
3079 sctp_send_asconf_ack(stcb);
3080 break;
3081 case SCTP_FORWARD_CUM_TSN:
3082 send_forward_tsn(stcb, &stcb->asoc);
3083 break;
3084 /* can't do anything with these */
3085 case SCTP_PACKET_DROPPED:
3086 case SCTP_INITIATION_ACK: /* this should not happen */
3087 case SCTP_HEARTBEAT_ACK:
3088 case SCTP_ABORT_ASSOCIATION:
3089 case SCTP_OPERATION_ERROR:
3090 case SCTP_SHUTDOWN_COMPLETE:
3091 case SCTP_ECN_ECHO:
3092 case SCTP_ECN_CWR:
3093 default:
3094 break;
3095 }
3096 return (0);
3097}
3098
3099void
3100sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3101{
3102 int i;
3103 uint16_t temp;
3104
3105 /*
3106 * We set things to 0xffff since this is the last delivered sequence
3107 * and we will be sending in 0 after the reset.
3108 */
3109
3110 if (number_entries) {
3111 for (i = 0; i < number_entries; i++) {
3112 temp = ntohs(list[i]);
3113 if (temp >= stcb->asoc.streamincnt) {
3114 continue;
3115 }
3116 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3117 }
3118 } else {
3119 list = NULL;
3120 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3121 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3122 }
3123 }
3124 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3125}
3126
3127static void
3128sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list)
3129{
3130 int i;
3131
3132 if (number_entries == 0) {
3133 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3134 stcb->asoc.strmout[i].next_sequence_sent = 0;
3135 }
3136 } else if (number_entries) {
3137 for (i = 0; i < number_entries; i++) {
3138 uint16_t temp;
3139
3140 temp = ntohs(list[i]);
3141 if (temp >= stcb->asoc.streamoutcnt) {
3142 /* no such stream */
3143 continue;
3144 }
3145 stcb->asoc.strmout[temp].next_sequence_sent = 0;
3146 }
3147 }
3148 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3149}
3150
3151
3152struct sctp_stream_reset_out_request *
3153sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3154{
3155 struct sctp_association *asoc;
3156 struct sctp_stream_reset_out_req *req;
3157 struct sctp_stream_reset_out_request *r;
3158 struct sctp_tmit_chunk *chk;
3159 int len, clen;
3160
3161 asoc = &stcb->asoc;
3162 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3163 asoc->stream_reset_outstanding = 0;
3164 return (NULL);
3165 }
3166 if (stcb->asoc.str_reset == NULL) {
3167 asoc->stream_reset_outstanding = 0;
3168 return (NULL);
3169 }
3170 chk = stcb->asoc.str_reset;
3171 if (chk->data == NULL) {
3172 return (NULL);
3173 }
3174 if (bchk) {
3175 /* he wants a copy of the chk pointer */
3176 *bchk = chk;
3177 }
3178 clen = chk->send_size;
3179 req = mtod(chk->data, struct sctp_stream_reset_out_req *);
3180 r = &req->sr_req;
3181 if (ntohl(r->request_seq) == seq) {
3182 /* found it */
3183 return (r);
3184 }
3185 len = SCTP_SIZE32(ntohs(r->ph.param_length));
3186 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3187 /* move to the next one, there can only be a max of two */
3188 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3189 if (ntohl(r->request_seq) == seq) {
3190 return (r);
3191 }
3192 }
3193 /* that seq is not here */
3194 return (NULL);
3195}
3196
3197static void
3198sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3199{
3200 struct sctp_association *asoc;
3201 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3202
3203 if (stcb->asoc.str_reset == NULL) {
3204 return;
3205 }
3206 asoc = &stcb->asoc;
3207
3208 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3209 TAILQ_REMOVE(&asoc->control_send_queue,
3210 chk,
3211 sctp_next);
3212 if (chk->data) {
3213 sctp_m_freem(chk->data);
3214 chk->data = NULL;
3215 }
3216 asoc->ctrl_queue_cnt--;
3217 sctp_free_a_chunk(stcb, chk);
3218 /* sa_ignore NO_NULL_CHK */
3219 stcb->asoc.str_reset = NULL;
3220}
3221
3222
3223static int
3224sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3225 uint32_t seq, uint32_t action,
3226 struct sctp_stream_reset_response *respin)
3227{
3228 uint16_t type;
3229 int lparm_len;
3230 struct sctp_association *asoc = &stcb->asoc;
3231 struct sctp_tmit_chunk *chk;
3232 struct sctp_stream_reset_out_request *srparam;
3233 int number_entries;
3234
3235 if (asoc->stream_reset_outstanding == 0) {
3236 /* duplicate */
3237 return (0);
3238 }
3239 if (seq == stcb->asoc.str_reset_seq_out) {
3240 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3241 if (srparam) {
3242 stcb->asoc.str_reset_seq_out++;
3243 type = ntohs(srparam->ph.param_type);
3244 lparm_len = ntohs(srparam->ph.param_length);
3245 if (type == SCTP_STR_RESET_OUT_REQUEST) {
3246 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3247 asoc->stream_reset_out_is_outstanding = 0;
3248 if (asoc->stream_reset_outstanding)
3249 asoc->stream_reset_outstanding--;
3250 if (action == SCTP_STREAM_RESET_PERFORMED) {
3251 /* do it */
3252 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3253 } else {
3254 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3255 }
3256 } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3257 /* Answered my request */
3258 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3259 if (asoc->stream_reset_outstanding)
3260 asoc->stream_reset_outstanding--;
3261 if (action != SCTP_STREAM_RESET_PERFORMED) {
3262 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3263 }
3264 } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3265 /**
3266 * a) Adopt the new in tsn.
3267 * b) reset the map
3268 * c) Adopt the new out-tsn
3269 */
3270 struct sctp_stream_reset_response_tsn *resp;
3271 struct sctp_forward_tsn_chunk fwdtsn;
3272 int abort_flag = 0;
3273
3274 if (respin == NULL) {
3275 /* huh ? */
3276 return (0);
3277 }
3278 if (action == SCTP_STREAM_RESET_PERFORMED) {
3279 resp = (struct sctp_stream_reset_response_tsn *)respin;
3280 asoc->stream_reset_outstanding--;
3281 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3282 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3283 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3284 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3285 if (abort_flag) {
3286 return (1);
3287 }
3288 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3289 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3290 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3291 }
3292 stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3293 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3294 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3295 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3296 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3297
3298 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3299 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3300
3301 }
3302 }
3303 /* get rid of the request and get the request flags */
3304 if (asoc->stream_reset_outstanding == 0) {
3305 sctp_clean_up_stream_reset(stcb);
3306 }
3307 }
3308 }
3309 return (0);
3310}
3311
3312static void
3313sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3314 struct sctp_tmit_chunk *chk,
3315 struct sctp_stream_reset_in_request *req, int trunc)
3316{
3317 uint32_t seq;
3318 int len, i;
3319 int number_entries;
3320 uint16_t temp;
3321
3322 /*
3323 * peer wants me to send a str-reset to him for my outgoing seq's if
3324 * seq_in is right.
3325 */
3326 struct sctp_association *asoc = &stcb->asoc;
3327
3328 seq = ntohl(req->request_seq);
3329 if (asoc->str_reset_seq_in == seq) {
3330 if (trunc) {
3331 /* Can't do it, since they exceeded our buffer size */
3332 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3333 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3334 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3335 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3336 len = ntohs(req->ph.param_length);
3337 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3338 for (i = 0; i < number_entries; i++) {
3339 temp = ntohs(req->list_of_streams[i]);
3340 req->list_of_streams[i] = temp;
3341 }
3342 /* move the reset action back one */
3343 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3344 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3345 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3346 asoc->str_reset_seq_out,
3347 seq, (asoc->sending_seq - 1));
3348 asoc->stream_reset_out_is_outstanding = 1;
3349 asoc->str_reset = chk;
3350 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3351 stcb->asoc.stream_reset_outstanding++;
3352 } else {
3353 /* Can't do it, since we have sent one out */
3354 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3355 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER;
3356 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3357 }
3358 asoc->str_reset_seq_in++;
3359 } else if (asoc->str_reset_seq_in - 1 == seq) {
3360 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3361 } else if (asoc->str_reset_seq_in - 2 == seq) {
3362 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3363 } else {
3364 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3365 }
3366}
3367
3368static int
3369sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3370 struct sctp_tmit_chunk *chk,
3371 struct sctp_stream_reset_tsn_request *req)
3372{
3373 /* reset all in and out and update the tsn */
3374 /*
3375 * A) reset my str-seq's on in and out. B) Select a receive next,
3376 * and set cum-ack to it. Also process this selected number as a
3377 * fwd-tsn as well. C) set in the response my next sending seq.
3378 */
3379 struct sctp_forward_tsn_chunk fwdtsn;
3380 struct sctp_association *asoc = &stcb->asoc;
3381 int abort_flag = 0;
3382 uint32_t seq;
3383
3384 seq = ntohl(req->request_seq);
3385 if (asoc->str_reset_seq_in == seq) {
3386 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3387 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3388 fwdtsn.ch.chunk_flags = 0;
3389 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3390 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3391 if (abort_flag) {
3392 return (1);
3393 }
3394 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3395 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3396 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3397 }
3398 stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3399 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1;
3400 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3401 atomic_add_int(&stcb->asoc.sending_seq, 1);
3402 /* save off historical data for retrans */
3403 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0];
3404 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq;
3405 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0];
3406 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn;
3407
3408 sctp_add_stream_reset_result_tsn(chk,
3409 ntohl(req->request_seq),
3410 SCTP_STREAM_RESET_PERFORMED,
3411 stcb->asoc.sending_seq,
3412 stcb->asoc.mapping_array_base_tsn);
3413 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3414 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3415 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3416 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3417
3418 asoc->str_reset_seq_in++;
3419 } else if (asoc->str_reset_seq_in - 1 == seq) {
3420 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3421 stcb->asoc.last_sending_seq[0],
3422 stcb->asoc.last_base_tsnsent[0]
3423 );
3424 } else if (asoc->str_reset_seq_in - 2 == seq) {
3425 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3426 stcb->asoc.last_sending_seq[1],
3427 stcb->asoc.last_base_tsnsent[1]
3428 );
3429 } else {
3430 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3431 }
3432 return (0);
3433}
3434
3435static void
3436sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3437 struct sctp_tmit_chunk *chk,
3438 struct sctp_stream_reset_out_request *req, int trunc)
3439{
3440 uint32_t seq, tsn;
3441 int number_entries, len;
3442 struct sctp_association *asoc = &stcb->asoc;
3443
3444 seq = ntohl(req->request_seq);
3445
3446 /* now if its not a duplicate we process it */
3447 if (asoc->str_reset_seq_in == seq) {
3448 len = ntohs(req->ph.param_length);
3449 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3450 /*
3451 * the sender is resetting, handle the list issue.. we must
3452 * a) verify if we can do the reset, if so no problem b) If
3453 * we can't do the reset we must copy the request. c) queue
3454 * it, and setup the data in processor to trigger it off
3455 * when needed and dequeue all the queued data.
3456 */
3457 tsn = ntohl(req->send_reset_at_tsn);
3458
3459 /* move the reset action back one */
3460 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3461 if (trunc) {
3462 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3463 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3464 } else if ((tsn == asoc->cumulative_tsn) ||
3465 (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) {
3466 /* we can do it now */
3467 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3468 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3469 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3470 } else {
3471 /*
3472 * we must queue it up and thus wait for the TSN's
3473 * to arrive that are at or before tsn
3474 */
3475 struct sctp_stream_reset_list *liste;
3476 int siz;
3477
3478 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3479 SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3480 siz, SCTP_M_STRESET);
3481 if (liste == NULL) {
3482 /* gak out of memory */
3483 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED);
3484 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED;
3485 return;
3486 }
3487 liste->tsn = tsn;
3488 liste->number_entries = number_entries;
3489 memcpy(&liste->req, req,
3490 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t))));
3491 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3492 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED);
3493 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED;
3494 }
3495 asoc->str_reset_seq_in++;
3496 } else if ((asoc->str_reset_seq_in - 1) == seq) {
3497 /*
3498 * one seq back, just echo back last action since my
3499 * response was lost.
3500 */
3501 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3502 } else if ((asoc->str_reset_seq_in - 2) == seq) {
3503 /*
3504 * two seq back, just echo back last action since my
3505 * response was lost.
3506 */
3507 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3508 } else {
3509 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO);
3510 }
3511}
3512
3513#ifdef __GNUC__
3514__attribute__((noinline))
3515#endif
3516 static int
3517 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3518 struct sctp_stream_reset_out_req *sr_req)
3519{
3520 int chk_length, param_len, ptype;
3521 struct sctp_paramhdr pstore;
3522 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3523
3524 uint32_t seq;
3525 int num_req = 0;
3526 int trunc = 0;
3527 struct sctp_tmit_chunk *chk;
3528 struct sctp_chunkhdr *ch;
3529 struct sctp_paramhdr *ph;
3530 int ret_code = 0;
3531 int num_param = 0;
3532
3533 /* now it may be a reset or a reset-response */
3534 chk_length = ntohs(sr_req->ch.chunk_length);
3535
3536 /* setup for adding the response */
3537 sctp_alloc_a_chunk(stcb, chk);
3538 if (chk == NULL) {
3539 return (ret_code);
3540 }
3541 chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3542 chk->rec.chunk_id.can_take_data = 0;
3543 chk->asoc = &stcb->asoc;
3544 chk->no_fr_allowed = 0;
3545 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3546 chk->book_size_scale = 0;
3547 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
3548 if (chk->data == NULL) {
3549strres_nochunk:
3550 if (chk->data) {
3551 sctp_m_freem(chk->data);
3552 chk->data = NULL;
3553 }
3554 sctp_free_a_chunk(stcb, chk);
3555 return (ret_code);
3556 }
3557 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
3558
3559 /* setup chunk parameters */
3560 chk->sent = SCTP_DATAGRAM_UNSENT;
3561 chk->snd_count = 0;
3562 chk->whoTo = stcb->asoc.primary_destination;
3563 atomic_add_int(&chk->whoTo->ref_count, 1);
3564
3565 ch = mtod(chk->data, struct sctp_chunkhdr *);
3566 ch->chunk_type = SCTP_STREAM_RESET;
3567 ch->chunk_flags = 0;
3568 ch->chunk_length = htons(chk->send_size);
3569 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
3570 offset += sizeof(struct sctp_chunkhdr);
3571 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
3572 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
3573 if (ph == NULL)
3574 break;
3575 param_len = ntohs(ph->param_length);
3576 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
3577 /* bad param */
3578 break;
3579 }
3580 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
3581 (uint8_t *) & cstore);
3582 ptype = ntohs(ph->param_type);
3583 num_param++;
3584 if (param_len > (int)sizeof(cstore)) {
3585 trunc = 1;
3586 } else {
3587 trunc = 0;
3588 }
3589
3590 if (num_param > SCTP_MAX_RESET_PARAMS) {
3591 /* hit the max of parameters already sorry.. */
3592 break;
3593 }
3594 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
3595 struct sctp_stream_reset_out_request *req_out;
3596
3597 req_out = (struct sctp_stream_reset_out_request *)ph;
3598 num_req++;
3599 if (stcb->asoc.stream_reset_outstanding) {
3600 seq = ntohl(req_out->response_seq);
3601 if (seq == stcb->asoc.str_reset_seq_out) {
3602 /* implicit ack */
3603 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL);
3604 }
3605 }
3606 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
3607 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
3608 struct sctp_stream_reset_in_request *req_in;
3609
3610 num_req++;
3611
3612 req_in = (struct sctp_stream_reset_in_request *)ph;
3613
3614 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
3615 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
3616 struct sctp_stream_reset_tsn_request *req_tsn;
3617
3618 num_req++;
3619 req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
3620
3621 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
3622 ret_code = 1;
3623 goto strres_nochunk;
3624 }
3625 /* no more */
3626 break;
3627 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
3628 struct sctp_stream_reset_response *resp;
3629 uint32_t result;
3630
3631 resp = (struct sctp_stream_reset_response *)ph;
3632 seq = ntohl(resp->response_seq);
3633 result = ntohl(resp->result);
3634 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
3635 ret_code = 1;
3636 goto strres_nochunk;
3637 }
3638 } else {
3639 break;
3640 }
3641 offset += SCTP_SIZE32(param_len);
3642 chk_length -= SCTP_SIZE32(param_len);
3643 }
3644 if (num_req == 0) {
3645 /* we have no response free the stuff */
3646 goto strres_nochunk;
3647 }
3648 /* ok we have a chunk to link in */
3649 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
3650 chk,
3651 sctp_next);
3652 stcb->asoc.ctrl_queue_cnt++;
3653 return (ret_code);
3654}
3655
3656/*
3657 * Handle a router or endpoints report of a packet loss, there are two ways
3658 * to handle this, either we get the whole packet and must disect it
3659 * ourselves (possibly with truncation and or corruption) or it is a summary
3660 * from a middle box that did the disectting for us.
3661 */
3662static void
3663sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
3664 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
3665{
3666 uint32_t bottle_bw, on_queue;
3667 uint16_t trunc_len;
3668 unsigned int chlen;
3669 unsigned int at;
3670 struct sctp_chunk_desc desc;
3671 struct sctp_chunkhdr *ch;
3672
3673 chlen = ntohs(cp->ch.chunk_length);
3674 chlen -= sizeof(struct sctp_pktdrop_chunk);
3675 /* XXX possible chlen underflow */
3676 if (chlen == 0) {
3677 ch = NULL;
3678 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
3679 SCTP_STAT_INCR(sctps_pdrpbwrpt);
3680 } else {
3681 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
3682 chlen -= sizeof(struct sctphdr);
3683 /* XXX possible chlen underflow */
3684 memset(&desc, 0, sizeof(desc));
3685 }
3686 trunc_len = (uint16_t) ntohs(cp->trunc_len);
3687 if (trunc_len > limit) {
3688 trunc_len = limit;
3689 }
3690 /* now the chunks themselves */
3691 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
3692 desc.chunk_type = ch->chunk_type;
3693 /* get amount we need to move */
3694 at = ntohs(ch->chunk_length);
3695 if (at < sizeof(struct sctp_chunkhdr)) {
3696 /* corrupt chunk, maybe at the end? */
3697 SCTP_STAT_INCR(sctps_pdrpcrupt);
3698 break;
3699 }
3700 if (trunc_len == 0) {
3701 /* we are supposed to have all of it */
3702 if (at > chlen) {
3703 /* corrupt skip it */
3704 SCTP_STAT_INCR(sctps_pdrpcrupt);
3705 break;
3706 }
3707 } else {
3708 /* is there enough of it left ? */
3709 if (desc.chunk_type == SCTP_DATA) {
3710 if (chlen < (sizeof(struct sctp_data_chunk) +
3711 sizeof(desc.data_bytes))) {
3712 break;
3713 }
3714 } else {
3715 if (chlen < sizeof(struct sctp_chunkhdr)) {
3716 break;
3717 }
3718 }
3719 }
3720 if (desc.chunk_type == SCTP_DATA) {
3721 /* can we get out the tsn? */
3722 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
3723 SCTP_STAT_INCR(sctps_pdrpmbda);
3724
3725 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
3726 /* yep */
3727 struct sctp_data_chunk *dcp;
3728 uint8_t *ddp;
3729 unsigned int iii;
3730
3731 dcp = (struct sctp_data_chunk *)ch;
3732 ddp = (uint8_t *) (dcp + 1);
3733 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
3734 desc.data_bytes[iii] = ddp[iii];
3735 }
3736 desc.tsn_ifany = dcp->dp.tsn;
3737 } else {
3738 /* nope we are done. */
3739 SCTP_STAT_INCR(sctps_pdrpnedat);
3740 break;
3741 }
3742 } else {
3743 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
3744 SCTP_STAT_INCR(sctps_pdrpmbct);
3745 }
3746
3747 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
3748 SCTP_STAT_INCR(sctps_pdrppdbrk);
3749 break;
3750 }
3751 if (SCTP_SIZE32(at) > chlen) {
3752 break;
3753 }
3754 chlen -= SCTP_SIZE32(at);
3755 if (chlen < sizeof(struct sctp_chunkhdr)) {
3756 /* done, none left */
3757 break;
3758 }
3759 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
3760 }
3761 /* Now update any rwnd --- possibly */
3762 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
3763 /* From a peer, we get a rwnd report */
3764 uint32_t a_rwnd;
3765
3766 SCTP_STAT_INCR(sctps_pdrpfehos);
3767
3768 bottle_bw = ntohl(cp->bottle_bw);
3769 on_queue = ntohl(cp->current_onq);
3770 if (bottle_bw && on_queue) {
3771 /* a rwnd report is in here */
3772 if (bottle_bw > on_queue)
3773 a_rwnd = bottle_bw - on_queue;
3774 else
3775 a_rwnd = 0;
3776
3777 if (a_rwnd == 0)
3778 stcb->asoc.peers_rwnd = 0;
3779 else {
3780 if (a_rwnd > stcb->asoc.total_flight) {
3781 stcb->asoc.peers_rwnd =
3782 a_rwnd - stcb->asoc.total_flight;
3783 } else {
3784 stcb->asoc.peers_rwnd = 0;
3785 }
3786 if (stcb->asoc.peers_rwnd <
3787 stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
3788 /* SWS sender side engages */
3789 stcb->asoc.peers_rwnd = 0;
3790 }
3791 }
3792 }
3793 } else {
3794 SCTP_STAT_INCR(sctps_pdrpfmbox);
3795 }
3796
3797 /* now middle boxes in sat networks get a cwnd bump */
3798 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
3799 (stcb->asoc.sat_t3_loss_recovery == 0) &&
3800 (stcb->asoc.sat_network)) {
3801 /*
3802 * This is debateable but for sat networks it makes sense
3803 * Note if a T3 timer has went off, we will prohibit any
3804 * changes to cwnd until we exit the t3 loss recovery.
3805 */
3806 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
3807 net, cp, &bottle_bw, &on_queue);
3808 }
3809}
3810
3811/*
3812 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
3813 * still contain IP/SCTP header - stcb: is the tcb found for this packet -
3814 * offset: offset into the mbuf chain to first chunkhdr - length: is the
3815 * length of the complete packet outputs: - length: modified to remaining
3816 * length after control processing - netp: modified to new sctp_nets after
3817 * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
3818 * bad packet,...) otherwise return the tcb for this packet
3819 */
3820#ifdef __GNUC__
3821__attribute__((noinline))
3822#endif
3823 static struct sctp_tcb *
3824 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
3825 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
3826 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
3827 uint32_t vrf_id, uint16_t port)
3828{
3829 struct sctp_association *asoc;
3830 uint32_t vtag_in;
3831 int num_chunks = 0; /* number of control chunks processed */
3832 uint32_t chk_length;
3833 int ret;
3834 int abort_no_unlock = 0;
3835
3836 /*
3837 * How big should this be, and should it be alloc'd? Lets try the
3838 * d-mtu-ceiling for now (2k) and that should hopefully work ...
3839 * until we get into jumbo grams and such..
3840 */
3841 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
3842 struct sctp_tcb *locked_tcb = stcb;
3843 int got_auth = 0;
3844 uint32_t auth_offset = 0, auth_len = 0;
3845 int auth_skipped = 0;
3846 int asconf_cnt = 0;
3847
3848#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3849 struct socket *so;
3850
3851#endif
3852
3853 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
3854 iphlen, *offset, length, stcb);
3855
3856 /* validate chunk header length... */
3857 if (ntohs(ch->chunk_length) < sizeof(*ch)) {
3858 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
3859 ntohs(ch->chunk_length));
3860 if (locked_tcb) {
3861 SCTP_TCB_UNLOCK(locked_tcb);
3862 }
3863 return (NULL);
3864 }
3865 /*
3866 * validate the verification tag
3867 */
3868 vtag_in = ntohl(sh->v_tag);
3869
3870 if (locked_tcb) {
3871 SCTP_TCB_LOCK_ASSERT(locked_tcb);
3872 }
3873 if (ch->chunk_type == SCTP_INITIATION) {
3874 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
3875 ntohs(ch->chunk_length), vtag_in);
3876 if (vtag_in != 0) {
3877 /* protocol error- silently discard... */
3878 SCTP_STAT_INCR(sctps_badvtag);
3879 if (locked_tcb) {
3880 SCTP_TCB_UNLOCK(locked_tcb);
3881 }
3882 return (NULL);
3883 }
3884 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
3885 /*
3886 * If there is no stcb, skip the AUTH chunk and process
3887 * later after a stcb is found (to validate the lookup was
3888 * valid.
3889 */
3890 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
3891 (stcb == NULL) &&
3892 !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
3893 /* save this chunk for later processing */
3894 auth_skipped = 1;
3895 auth_offset = *offset;
3896 auth_len = ntohs(ch->chunk_length);
3897
3898 /* (temporarily) move past this chunk */
3899 *offset += SCTP_SIZE32(auth_len);
3900 if (*offset >= length) {
3901 /* no more data left in the mbuf chain */
3902 *offset = length;
3903 if (locked_tcb) {
3904 SCTP_TCB_UNLOCK(locked_tcb);
3905 }
3906 return (NULL);
3907 }
3908 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
3909 sizeof(struct sctp_chunkhdr), chunk_buf);
3910 }
3911 if (ch == NULL) {
3912 /* Help */
3913 *offset = length;
3914 if (locked_tcb) {
3915 SCTP_TCB_UNLOCK(locked_tcb);
3916 }
3917 return (NULL);
3918 }
3919 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
3920 goto process_control_chunks;
3921 }
3922 /*
3923 * first check if it's an ASCONF with an unknown src addr we
3924 * need to look inside to find the association
3925 */
3926 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
3927 struct sctp_chunkhdr *asconf_ch = ch;
3928 uint32_t asconf_offset = 0, asconf_len = 0;
3929
3930 /* inp's refcount may be reduced */
3931 SCTP_INP_INCR_REF(inp);
3932
3933 asconf_offset = *offset;
3934 do {
3935 asconf_len = ntohs(asconf_ch->chunk_length);
3936 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
3937 break;
3938 stcb = sctp_findassociation_ep_asconf(m, iphlen,
3939 *offset, sh, &inp, netp);
3940 if (stcb != NULL)
3941 break;
3942 asconf_offset += SCTP_SIZE32(asconf_len);
3943 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
3944 sizeof(struct sctp_chunkhdr), chunk_buf);
3945 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
3946 if (stcb == NULL) {
3947 /*
3948 * reduce inp's refcount if not reduced in
3949 * sctp_findassociation_ep_asconf().
3950 */
3951 SCTP_INP_DECR_REF(inp);
3952 } else {
3953 locked_tcb = stcb;
3954 }
3955
3956 /* now go back and verify any auth chunk to be sure */
3957 if (auth_skipped && (stcb != NULL)) {
3958 struct sctp_auth_chunk *auth;
3959
3960 auth = (struct sctp_auth_chunk *)
3961 sctp_m_getptr(m, auth_offset,
3962 auth_len, chunk_buf);
3963 got_auth = 1;
3964 auth_skipped = 0;
3965 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
3966 auth_offset)) {
3967 /* auth HMAC failed so dump it */
3968 *offset = length;
3969 if (locked_tcb) {
3970 SCTP_TCB_UNLOCK(locked_tcb);
3971 }
3972 return (NULL);
3973 } else {
3974 /* remaining chunks are HMAC checked */
3975 stcb->asoc.authenticated = 1;
3976 }
3977 }
3978 }
3979 if (stcb == NULL) {
3980 /* no association, so it's out of the blue... */
3981 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL,
3982 vrf_id, port);
3983 *offset = length;
3984 if (locked_tcb) {
3985 SCTP_TCB_UNLOCK(locked_tcb);
3986 }
3987 return (NULL);
3988 }
3989 asoc = &stcb->asoc;
3990 /* ABORT and SHUTDOWN can use either v_tag... */
3991 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
3992 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
3993 (ch->chunk_type == SCTP_PACKET_DROPPED)) {
3994 if ((vtag_in == asoc->my_vtag) ||
3995 ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
3996 (vtag_in == asoc->peer_vtag))) {
3997 /* this is valid */
3998 } else {
3999 /* drop this packet... */
4000 SCTP_STAT_INCR(sctps_badvtag);
4001 if (locked_tcb) {
4002 SCTP_TCB_UNLOCK(locked_tcb);
4003 }
4004 return (NULL);
4005 }
4006 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4007 if (vtag_in != asoc->my_vtag) {
4008 /*
4009 * this could be a stale SHUTDOWN-ACK or the
4010 * peer never got the SHUTDOWN-COMPLETE and
4011 * is still hung; we have started a new asoc
4012 * but it won't complete until the shutdown
4013 * is completed
4014 */
4015 if (locked_tcb) {
4016 SCTP_TCB_UNLOCK(locked_tcb);
4017 }
4018 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
4019 NULL, vrf_id, port);
4020 return (NULL);
4021 }
4022 } else {
4023 /* for all other chunks, vtag must match */
4024 if (vtag_in != asoc->my_vtag) {
4025 /* invalid vtag... */
4026 SCTPDBG(SCTP_DEBUG_INPUT3,
4027 "invalid vtag: %xh, expect %xh\n",
4028 vtag_in, asoc->my_vtag);
4029 SCTP_STAT_INCR(sctps_badvtag);
4030 if (locked_tcb) {
4031 SCTP_TCB_UNLOCK(locked_tcb);
4032 }
4033 *offset = length;
4034 return (NULL);
4035 }
4036 }
4037 } /* end if !SCTP_COOKIE_ECHO */
4038 /*
4039 * process all control chunks...
4040 */
4041 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4042 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4043 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4044 /* implied cookie-ack.. we must have lost the ack */
4045 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4046 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4047 stcb->asoc.overall_error_count,
4048 0,
4049 SCTP_FROM_SCTP_INPUT,
4050 __LINE__);
4051 }
4052 stcb->asoc.overall_error_count = 0;
4053 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4054 *netp);
4055 }
4056process_control_chunks:
4057 while (IS_SCTP_CONTROL(ch)) {
4058 /* validate chunk length */
4059 chk_length = ntohs(ch->chunk_length);
4060 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4061 ch->chunk_type, chk_length);
4062 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4063 if (chk_length < sizeof(*ch) ||
4064 (*offset + (int)chk_length) > length) {
4065 *offset = length;
4066 if (locked_tcb) {
4067 SCTP_TCB_UNLOCK(locked_tcb);
4068 }
4069 return (NULL);
4070 }
4071 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4072 /*
4073 * INIT-ACK only gets the init ack "header" portion only
4074 * because we don't have to process the peer's COOKIE. All
4075 * others get a complete chunk.
4076 */
4077 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4078 (ch->chunk_type == SCTP_INITIATION)) {
4079 /* get an init-ack chunk */
4080 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4081 sizeof(struct sctp_init_ack_chunk), chunk_buf);
4082 if (ch == NULL) {
4083 *offset = length;
4084 if (locked_tcb) {
4085 SCTP_TCB_UNLOCK(locked_tcb);
4086 }
4087 return (NULL);
4088 }
4089 } else {
4090 /* For cookies and all other chunks. */
4091 if (chk_length > sizeof(chunk_buf)) {
4092 /*
4093 * use just the size of the chunk buffer so
4094 * the front part of our chunks fit in
4095 * contiguous space up to the chunk buffer
4096 * size (508 bytes). For chunks that need to
4097 * get more than that they must use the
4098 * sctp_m_getptr() function or other means
4099 * (e.g. know how to parse mbuf chains).
4100 * Cookies do this already.
4101 */
4102 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4103 (sizeof(chunk_buf) - 4),
4104 chunk_buf);
4105 if (ch == NULL) {
4106 *offset = length;
4107 if (locked_tcb) {
4108 SCTP_TCB_UNLOCK(locked_tcb);
4109 }
4110 return (NULL);
4111 }
4112 } else {
4113 /* We can fit it all */
4114 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4115 chk_length, chunk_buf);
4116 if (ch == NULL) {
4117 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4118 *offset = length;
4119 if (locked_tcb) {
4120 SCTP_TCB_UNLOCK(locked_tcb);
4121 }
4122 return (NULL);
4123 }
4124 }
4125 }
4126 num_chunks++;
4127 /* Save off the last place we got a control from */
4128 if (stcb != NULL) {
4129 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4130 /*
4131 * allow last_control to be NULL if
4132 * ASCONF... ASCONF processing will find the
4133 * right net later
4134 */
4135 if ((netp != NULL) && (*netp != NULL))
4136 stcb->asoc.last_control_chunk_from = *netp;
4137 }
4138 }
4139#ifdef SCTP_AUDITING_ENABLED
4140 sctp_audit_log(0xB0, ch->chunk_type);
4141#endif
4142
4143 /* check to see if this chunk required auth, but isn't */
4144 if ((stcb != NULL) &&
4145 !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4146 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4147 !stcb->asoc.authenticated) {
4148 /* "silently" ignore */
4149 SCTP_STAT_INCR(sctps_recvauthmissing);
4150 goto next_chunk;
4151 }
4152 switch (ch->chunk_type) {
4153 case SCTP_INITIATION:
4154 /* must be first and only chunk */
4155 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4156 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4157 /* We are not interested anymore? */
4158 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4159 /*
4160 * collision case where we are
4161 * sending to them too
4162 */
4163 ;
4164 } else {
4165 if (locked_tcb) {
4166 SCTP_TCB_UNLOCK(locked_tcb);
4167 }
4168 *offset = length;
4169 return (NULL);
4170 }
4171 }
4172 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) ||
4173 (num_chunks > 1) ||
4174 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4175 *offset = length;
4176 if (locked_tcb) {
4177 SCTP_TCB_UNLOCK(locked_tcb);
4178 }
4179 return (NULL);
4180 }
4181 if ((stcb != NULL) &&
4182 (SCTP_GET_STATE(&stcb->asoc) ==
4183 SCTP_STATE_SHUTDOWN_ACK_SENT)) {
4184 sctp_send_shutdown_ack(stcb,
4185 stcb->asoc.primary_destination);
4186 *offset = length;
4187 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4188 if (locked_tcb) {
4189 SCTP_TCB_UNLOCK(locked_tcb);
4190 }
4191 return (NULL);
4192 }
4193 if (netp) {
4194 sctp_handle_init(m, iphlen, *offset, sh,
4195 (struct sctp_init_chunk *)ch, inp,
4196 stcb, *netp, &abort_no_unlock, vrf_id, port);
4197 }
4198 if (abort_no_unlock)
4199 return (NULL);
4200
4201 *offset = length;
4202 if (locked_tcb) {
4203 SCTP_TCB_UNLOCK(locked_tcb);
4204 }
4205 return (NULL);
4206 break;
4207 case SCTP_PAD_CHUNK:
4208 break;
4209 case SCTP_INITIATION_ACK:
4210 /* must be first and only chunk */
4211 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4212 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4213 /* We are not interested anymore */
4214 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4215 ;
4216 } else {
4217 if (locked_tcb) {
4218 SCTP_TCB_UNLOCK(locked_tcb);
4219 }
4220 *offset = length;
4221 if (stcb) {
4222#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4223 so = SCTP_INP_SO(inp);
4224 atomic_add_int(&stcb->asoc.refcnt, 1);
4225 SCTP_TCB_UNLOCK(stcb);
4226 SCTP_SOCKET_LOCK(so, 1);
4227 SCTP_TCB_LOCK(stcb);
4228 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4229#endif
4230 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4231#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4232 SCTP_SOCKET_UNLOCK(so, 1);
4233#endif
4234 }
4235 return (NULL);
4236 }
4237 }
4238 if ((num_chunks > 1) ||
4239 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) {
4240 *offset = length;
4241 if (locked_tcb) {
4242 SCTP_TCB_UNLOCK(locked_tcb);
4243 }
4244 return (NULL);
4245 }
4246 if ((netp) && (*netp)) {
4247 ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
4248 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id);
4249 } else {
4250 ret = -1;
4251 }
4252 /*
4253 * Special case, I must call the output routine to
4254 * get the cookie echoed
4255 */
4256 if (abort_no_unlock)
4257 return (NULL);
4258
4259 if ((stcb) && ret == 0)
4260 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4261 *offset = length;
4262 if (locked_tcb) {
4263 SCTP_TCB_UNLOCK(locked_tcb);
4264 }
4265 return (NULL);
4266 break;
4267 case SCTP_SELECTIVE_ACK:
4268 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4269 SCTP_STAT_INCR(sctps_recvsacks);
4270 {
4271 struct sctp_sack_chunk *sack;
4272 int abort_now = 0;
4273 uint32_t a_rwnd, cum_ack;
4274 uint16_t num_seg;
4275 int nonce_sum_flag;
4276
4277 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_sack_chunk))) {
4278 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on sack chunk, too small\n");
4279 ignore_sack:
4280 *offset = length;
4281 if (locked_tcb) {
4282 SCTP_TCB_UNLOCK(locked_tcb);
4283 }
4284 return (NULL);
4285 }
4286 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4287 /*-
4288 * If we have sent a shutdown-ack, we will pay no
4289 * attention to a sack sent in to us since
4290 * we don't care anymore.
4291 */
4292 goto ignore_sack;
4293 }
4294 sack = (struct sctp_sack_chunk *)ch;
4295 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM;
4296 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4297 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4298 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4299 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4300 cum_ack,
4301 num_seg,
4302 a_rwnd
4303 );
4304 stcb->asoc.seen_a_sack_this_pkt = 1;
4305 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4306 (num_seg == 0) &&
4307 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) ||
4308 (cum_ack == stcb->asoc.last_acked_seq)) &&
4309 (stcb->asoc.saw_sack_with_frags == 0) &&
4310 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4311 ) {
4312 /*
4313 * We have a SIMPLE sack having no
4314 * prior segments and data on sent
4315 * queue to be acked.. Use the
4316 * faster path sack processing. We
4317 * also allow window update sacks
4318 * with no missing segments to go
4319 * this way too.
4320 */
4321 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag,
4322 &abort_now);
4323 } else {
4324 if (netp && *netp)
4325 sctp_handle_sack(m, *offset,
4326 sack, stcb, *netp, &abort_now, chk_length, a_rwnd);
4327 }
4328 if (abort_now) {
4329 /* ABORT signal from sack processing */
4330 *offset = length;
4331 return (NULL);
4332 }
4333 }
4334 break;
4335 case SCTP_HEARTBEAT_REQUEST:
4336 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4337 if ((stcb) && netp && *netp) {
4338 SCTP_STAT_INCR(sctps_recvheartbeat);
4339 sctp_send_heartbeat_ack(stcb, m, *offset,
4340 chk_length, *netp);
4341
4342 /* He's alive so give him credit */
4343 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4344 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4345 stcb->asoc.overall_error_count,
4346 0,
4347 SCTP_FROM_SCTP_INPUT,
4348 __LINE__);
4349 }
4350 stcb->asoc.overall_error_count = 0;
4351 }
4352 break;
4353 case SCTP_HEARTBEAT_ACK:
4354 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
4355 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4356 /* Its not ours */
4357 *offset = length;
4358 if (locked_tcb) {
4359 SCTP_TCB_UNLOCK(locked_tcb);
4360 }
4361 return (NULL);
4362 }
4363 /* He's alive so give him credit */
4364 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4365 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4366 stcb->asoc.overall_error_count,
4367 0,
4368 SCTP_FROM_SCTP_INPUT,
4369 __LINE__);
4370 }
4371 stcb->asoc.overall_error_count = 0;
4372 SCTP_STAT_INCR(sctps_recvheartbeatack);
4373 if (netp && *netp)
4374 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4375 stcb, *netp);
4376 break;
4377 case SCTP_ABORT_ASSOCIATION:
4378 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4379 stcb);
4380 if ((stcb) && netp && *netp)
4381 sctp_handle_abort((struct sctp_abort_chunk *)ch,
4382 stcb, *netp);
4383 *offset = length;
4384 return (NULL);
4385 break;
4386 case SCTP_SHUTDOWN:
4387 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4388 stcb);
4389 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4390 *offset = length;
4391 if (locked_tcb) {
4392 SCTP_TCB_UNLOCK(locked_tcb);
4393 }
4394 return (NULL);
4395 }
4396 if (netp && *netp) {
4397 int abort_flag = 0;
4398
4399 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4400 stcb, *netp, &abort_flag);
4401 if (abort_flag) {
4402 *offset = length;
4403 return (NULL);
4404 }
4405 }
4406 break;
4407 case SCTP_SHUTDOWN_ACK:
4408 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb);
4409 if ((stcb) && (netp) && (*netp))
4410 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4411 *offset = length;
4412 return (NULL);
4413 break;
4414
4415 case SCTP_OPERATION_ERROR:
4416 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
4417 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
4418
4419 *offset = length;
4420 return (NULL);
4421 }
4422 break;
4423 case SCTP_COOKIE_ECHO:
4424 SCTPDBG(SCTP_DEBUG_INPUT3,
4425 "SCTP_COOKIE-ECHO, stcb %p\n", stcb);
4426 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4427 ;
4428 } else {
4429 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4430 /* We are not interested anymore */
4431 *offset = length;
4432 return (NULL);
4433 }
4434 }
4435 /*
4436 * First are we accepting? We do this again here
4437 * sincen it is possible that a previous endpoint
4438 * WAS listening responded to a INIT-ACK and then
4439 * closed. We opened and bound.. and are now no
4440 * longer listening.
4441 */
4442
4443 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
4444 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4445 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4446 struct mbuf *oper;
4447 struct sctp_paramhdr *phdr;
4448
4449 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
4450 0, M_DONTWAIT, 1, MT_DATA);
4451 if (oper) {
4452 SCTP_BUF_LEN(oper) =
4453 sizeof(struct sctp_paramhdr);
4454 phdr = mtod(oper,
4455 struct sctp_paramhdr *);
4456 phdr->param_type =
4457 htons(SCTP_CAUSE_OUT_OF_RESC);
4458 phdr->param_length =
4459 htons(sizeof(struct sctp_paramhdr));
4460 }
4461 sctp_abort_association(inp, stcb, m,
4462 iphlen, sh, oper, vrf_id, port);
4463 }
4464 *offset = length;
4465 return (NULL);
4466 } else {
4467 struct mbuf *ret_buf;
4468 struct sctp_inpcb *linp;
4469
4470 if (stcb) {
4471 linp = NULL;
4472 } else {
4473 linp = inp;
4474 }
4475
4476 if (linp) {
4477 SCTP_ASOC_CREATE_LOCK(linp);
4478 }
4479 if (netp) {
4480 ret_buf =
4481 sctp_handle_cookie_echo(m, iphlen,
4482 *offset, sh,
4483 (struct sctp_cookie_echo_chunk *)ch,
4484 &inp, &stcb, netp,
4485 auth_skipped,
4486 auth_offset,
4487 auth_len,
4488 &locked_tcb,
4489 vrf_id,
4490 port);
4491 } else {
4492 ret_buf = NULL;
4493 }
4494 if (linp) {
4495 SCTP_ASOC_CREATE_UNLOCK(linp);
4496 }
4497 if (ret_buf == NULL) {
4498 if (locked_tcb) {
4499 SCTP_TCB_UNLOCK(locked_tcb);
4500 }
4501 SCTPDBG(SCTP_DEBUG_INPUT3,
4502 "GAK, null buffer\n");
4503 auth_skipped = 0;
4504 *offset = length;
4505 return (NULL);
4506 }
4507 /* if AUTH skipped, see if it verified... */
4508 if (auth_skipped) {
4509 got_auth = 1;
4510 auth_skipped = 0;
4511 }
4512 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
4513 /*
4514 * Restart the timer if we have
4515 * pending data
4516 */
4517 struct sctp_tmit_chunk *chk;
4518
4519 chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
4520 if (chk) {
4521 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
4522 stcb->sctp_ep, stcb,
4523 chk->whoTo);
4524 }
4525 }
4526 }
4527 break;
4528 case SCTP_COOKIE_ACK:
4529 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb);
4530 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
4531 if (locked_tcb) {
4532 SCTP_TCB_UNLOCK(locked_tcb);
4533 }
4534 return (NULL);
4535 }
4536 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4537 /* We are not interested anymore */
4538 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4539 ;
4540 } else if (stcb) {
4541#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4542 so = SCTP_INP_SO(inp);
4543 atomic_add_int(&stcb->asoc.refcnt, 1);
4544 SCTP_TCB_UNLOCK(stcb);
4545 SCTP_SOCKET_LOCK(so, 1);
4546 SCTP_TCB_LOCK(stcb);
4547 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4548#endif
4549 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4550#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4551 SCTP_SOCKET_UNLOCK(so, 1);
4552#endif
4553 *offset = length;
4554 return (NULL);
4555 }
4556 }
4557 /* He's alive so give him credit */
4558 if ((stcb) && netp && *netp) {
4559 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4560 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4561 stcb->asoc.overall_error_count,
4562 0,
4563 SCTP_FROM_SCTP_INPUT,
4564 __LINE__);
4565 }
4566 stcb->asoc.overall_error_count = 0;
4567 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
4568 }
4569 break;
4570 case SCTP_ECN_ECHO:
4571 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
4572 /* He's alive so give him credit */
4573 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
4574 /* Its not ours */
4575 if (locked_tcb) {
4576 SCTP_TCB_UNLOCK(locked_tcb);
4577 }
4578 *offset = length;
4579 return (NULL);
4580 }
4581 if (stcb) {
4582 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4583 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4584 stcb->asoc.overall_error_count,
4585 0,
4586 SCTP_FROM_SCTP_INPUT,
4587 __LINE__);
4588 }
4589 stcb->asoc.overall_error_count = 0;
4590 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
4591 stcb);
4592 }
4593 break;
4594 case SCTP_ECN_CWR:
4595 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
4596 /* He's alive so give him credit */
4597 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
4598 /* Its not ours */
4599 if (locked_tcb) {
4600 SCTP_TCB_UNLOCK(locked_tcb);
4601 }
4602 *offset = length;
4603 return (NULL);
4604 }
4605 if (stcb) {
4606 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4607 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4608 stcb->asoc.overall_error_count,
4609 0,
4610 SCTP_FROM_SCTP_INPUT,
4611 __LINE__);
4612 }
4613 stcb->asoc.overall_error_count = 0;
4614 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb);
4615 }
4616 break;
4617 case SCTP_SHUTDOWN_COMPLETE:
4618 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb);
4619 /* must be first and only chunk */
4620 if ((num_chunks > 1) ||
4621 (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4622 *offset = length;
4623 if (locked_tcb) {
4624 SCTP_TCB_UNLOCK(locked_tcb);
4625 }
4626 return (NULL);
4627 }
4628 if ((stcb) && netp && *netp) {
4629 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
4630 stcb, *netp);
4631 }
4632 *offset = length;
4633 return (NULL);
4634 break;
4635 case SCTP_ASCONF:
4636 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
4637 /* He's alive so give him credit */
4638 if (stcb) {
4639 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4640 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4641 stcb->asoc.overall_error_count,
4642 0,
4643 SCTP_FROM_SCTP_INPUT,
4644 __LINE__);
4645 }
4646 stcb->asoc.overall_error_count = 0;
4647 sctp_handle_asconf(m, *offset,
4648 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
4649 asconf_cnt++;
4650 }
4651 break;
4652 case SCTP_ASCONF_ACK:
4653 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
4654 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
4655 /* Its not ours */
4656 if (locked_tcb) {
4657 SCTP_TCB_UNLOCK(locked_tcb);
4658 }
4659 *offset = length;
4660 return (NULL);
4661 }
4662 if ((stcb) && netp && *netp) {
4663 /* He's alive so give him credit */
4664 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4665 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4666 stcb->asoc.overall_error_count,
4667 0,
4668 SCTP_FROM_SCTP_INPUT,
4669 __LINE__);
4670 }
4671 stcb->asoc.overall_error_count = 0;
4672 sctp_handle_asconf_ack(m, *offset,
4673 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
4674 if (abort_no_unlock)
4675 return (NULL);
4676 }
4677 break;
4678 case SCTP_FORWARD_CUM_TSN:
4679 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
4680 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
4681 /* Its not ours */
4682 if (locked_tcb) {
4683 SCTP_TCB_UNLOCK(locked_tcb);
4684 }
4685 *offset = length;
4686 return (NULL);
4687 }
4688 /* He's alive so give him credit */
4689 if (stcb) {
4690 int abort_flag = 0;
4691
4692 stcb->asoc.overall_error_count = 0;
4693 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4694 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4695 stcb->asoc.overall_error_count,
4696 0,
4697 SCTP_FROM_SCTP_INPUT,
4698 __LINE__);
4699 }
4700 *fwd_tsn_seen = 1;
4701 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4702 /* We are not interested anymore */
4703#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4704 so = SCTP_INP_SO(inp);
4705 atomic_add_int(&stcb->asoc.refcnt, 1);
4706 SCTP_TCB_UNLOCK(stcb);
4707 SCTP_SOCKET_LOCK(so, 1);
4708 SCTP_TCB_LOCK(stcb);
4709 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4710#endif
4711 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4712#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4713 SCTP_SOCKET_UNLOCK(so, 1);
4714#endif
4715 *offset = length;
4716 return (NULL);
4717 }
4718 sctp_handle_forward_tsn(stcb,
4719 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
4720 if (abort_flag) {
4721 *offset = length;
4722 return (NULL);
4723 } else {
4724 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4725 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4726 stcb->asoc.overall_error_count,
4727 0,
4728 SCTP_FROM_SCTP_INPUT,
4729 __LINE__);
4730 }
4731 stcb->asoc.overall_error_count = 0;
4732 }
4733
4734 }
4735 break;
4736 case SCTP_STREAM_RESET:
4737 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
4738 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
4739 /* Its not ours */
4740 if (locked_tcb) {
4741 SCTP_TCB_UNLOCK(locked_tcb);
4742 }
4743 *offset = length;
4744 return (NULL);
4745 }
4746 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4747 /* We are not interested anymore */
4748#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4749 so = SCTP_INP_SO(inp);
4750 atomic_add_int(&stcb->asoc.refcnt, 1);
4751 SCTP_TCB_UNLOCK(stcb);
4752 SCTP_SOCKET_LOCK(so, 1);
4753 SCTP_TCB_LOCK(stcb);
4754 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4755#endif
4756 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
4757#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4758 SCTP_SOCKET_UNLOCK(so, 1);
4759#endif
4760 *offset = length;
4761 return (NULL);
4762 }
4763 if (stcb->asoc.peer_supports_strreset == 0) {
4764 /*
4765 * hmm, peer should have announced this, but
4766 * we will turn it on since he is sending us
4767 * a stream reset.
4768 */
4769 stcb->asoc.peer_supports_strreset = 1;
4770 }
4771 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) {
4772 /* stop processing */
4773 *offset = length;
4774 return (NULL);
4775 }
4776 break;
4777 case SCTP_PACKET_DROPPED:
4778 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
4779 /* re-get it all please */
4780 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
4781 /* Its not ours */
4782 if (locked_tcb) {
4783 SCTP_TCB_UNLOCK(locked_tcb);
4784 }
4785 *offset = length;
4786 return (NULL);
4787 }
4788 if (ch && (stcb) && netp && (*netp)) {
4789 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
4790 stcb, *netp,
4791 min(chk_length, (sizeof(chunk_buf) - 4)));
4792
4793 }
4794 break;
4795
4796 case SCTP_AUTHENTICATION:
4797 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
4798 if (SCTP_BASE_SYSCTL(sctp_auth_disable))
4799 goto unknown_chunk;
4800
4801 if (stcb == NULL) {
4802 /* save the first AUTH for later processing */
4803 if (auth_skipped == 0) {
4804 auth_offset = *offset;
4805 auth_len = chk_length;
4806 auth_skipped = 1;
4807 }
4808 /* skip this chunk (temporarily) */
4809 goto next_chunk;
4810 }
4811 if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
4812 (chk_length > (sizeof(struct sctp_auth_chunk) +
4813 SCTP_AUTH_DIGEST_LEN_MAX))) {
4814 /* Its not ours */
4815 if (locked_tcb) {
4816 SCTP_TCB_UNLOCK(locked_tcb);
4817 }
4818 *offset = length;
4819 return (NULL);
4820 }
4821 if (got_auth == 1) {
4822 /* skip this chunk... it's already auth'd */
4823 goto next_chunk;
4824 }
4825 got_auth = 1;
4826 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
4827 m, *offset)) {
4828 /* auth HMAC failed so dump the packet */
4829 *offset = length;
4830 return (stcb);
4831 } else {
4832 /* remaining chunks are HMAC checked */
4833 stcb->asoc.authenticated = 1;
4834 }
4835 break;
4836
4837 default:
4838 unknown_chunk:
4839 /* it's an unknown chunk! */
4840 if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
4841 struct mbuf *mm;
4842 struct sctp_paramhdr *phd;
4843
4844 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
4845 0, M_DONTWAIT, 1, MT_DATA);
4846 if (mm) {
4847 phd = mtod(mm, struct sctp_paramhdr *);
4848 /*
4849 * We cheat and use param type since
4850 * we did not bother to define a
4851 * error cause struct. They are the
4852 * same basic format with different
4853 * names.
4854 */
4855 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
4856 phd->param_length = htons(chk_length + sizeof(*phd));
4857 SCTP_BUF_LEN(mm) = sizeof(*phd);
4858 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length),
4859 M_DONTWAIT);
4860 if (SCTP_BUF_NEXT(mm)) {
4861#ifdef SCTP_MBUF_LOGGING
4862 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
4863 struct mbuf *mat;
4864
4865 mat = SCTP_BUF_NEXT(mm);
4866 while (mat) {
4867 if (SCTP_BUF_IS_EXTENDED(mat)) {
4868 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
4869 }
4870 mat = SCTP_BUF_NEXT(mat);
4871 }
4872 }
4873#endif
4874 sctp_queue_op_err(stcb, mm);
4875 } else {
4876 sctp_m_freem(mm);
4877 }
4878 }
4879 }
4880 if ((ch->chunk_type & 0x80) == 0) {
4881 /* discard this packet */
4882 *offset = length;
4883 return (stcb);
4884 } /* else skip this bad chunk and continue... */
4885 break;
4886 } /* switch (ch->chunk_type) */
4887
4888
4889next_chunk:
4890 /* get the next chunk */
4891 *offset += SCTP_SIZE32(chk_length);
4892 if (*offset >= length) {
4893 /* no more data left in the mbuf chain */
4894 break;
4895 }
4896 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4897 sizeof(struct sctp_chunkhdr), chunk_buf);
4898 if (ch == NULL) {
4899 if (locked_tcb) {
4900 SCTP_TCB_UNLOCK(locked_tcb);
4901 }
4902 *offset = length;
4903 return (NULL);
4904 }
4905 } /* while */
4906
4907 if (asconf_cnt > 0 && stcb != NULL) {
4908 sctp_send_asconf_ack(stcb);
4909 }
4910 return (stcb);
4911}
4912
4913
4914/*
4915 * Process the ECN bits we have something set so we must look to see if it is
4916 * ECN(0) or ECN(1) or CE
4917 */
4918static void
4919sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net,
4920 uint8_t ecn_bits)
4921{
4922 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) {
4923 ;
4924 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) {
4925 /*
4926 * we only add to the nonce sum for ECT1, ECT0 does not
4927 * change the NS bit (that we have yet to find a way to send
4928 * it yet).
4929 */
4930
4931 /* ECN Nonce stuff */
4932 stcb->asoc.receiver_nonce_sum++;
4933 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM;
4934
4935 /*
4936 * Drag up the last_echo point if cumack is larger since we
4937 * don't want the point falling way behind by more than
4938 * 2^^31 and then having it be incorrect.
4939 */
4940 if (compare_with_wrap(stcb->asoc.cumulative_tsn,
4941 stcb->asoc.last_echo_tsn, MAX_TSN)) {
4942 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn;
4943 }
4944 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) {
4945 /*
4946 * Drag up the last_echo point if cumack is larger since we
4947 * don't want the point falling way behind by more than
4948 * 2^^31 and then having it be incorrect.
4949 */
4950 if (compare_with_wrap(stcb->asoc.cumulative_tsn,
4951 stcb->asoc.last_echo_tsn, MAX_TSN)) {
4952 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn;
4953 }
4954 }
4955}
4956
4957static void
4958sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net,
4959 uint32_t high_tsn, uint8_t ecn_bits)
4960{
4961 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) {
4962 /*
4963 * we possibly must notify the sender that a congestion
4964 * window reduction is in order. We do this by adding a ECNE
4965 * chunk to the output chunk queue. The incoming CWR will
4966 * remove this chunk.
4967 */
4968 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn,
4969 MAX_TSN)) {
4970 /* Yep, we need to add a ECNE */
4971 sctp_send_ecn_echo(stcb, net, high_tsn);
4972 stcb->asoc.last_echo_tsn = high_tsn;
4973 }
4974 }
4975}
4976
4977#ifdef INVARIANTS
4978static void
4979sctp_validate_no_locks(struct sctp_inpcb *inp)
4980{
4981 struct sctp_tcb *stcb;
4982
4983 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
4984 if (mtx_owned(&stcb->tcb_mtx)) {
4985 panic("Own lock on stcb at return from input");
4986 }
4987 }
4988}
4989
4990#endif
4991
4992/*
4993 * common input chunk processing (v4 and v6)
4994 */
4995void
4996sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
4997 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
4998 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
4999 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port)
5000{
5001 /*
5002 * Control chunk processing
5003 */
5004 uint32_t high_tsn;
5005 int fwd_tsn_seen = 0, data_processed = 0;
5006 struct mbuf *m = *mm;
5007 int abort_flag = 0;
5008 int un_sent;
5009
5010 SCTP_STAT_INCR(sctps_recvdatagrams);
5011#ifdef SCTP_AUDITING_ENABLED
5012 sctp_audit_log(0xE0, 1);
5013 sctp_auditing(0, inp, stcb, net);
5014#endif
5015
5016 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5017 m, iphlen, offset, length, stcb);
5018 if (stcb) {
5019 /* always clear this before beginning a packet */
5020 stcb->asoc.authenticated = 0;
5021 stcb->asoc.seen_a_sack_this_pkt = 0;
5022 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5023 stcb, stcb->asoc.state);
5024
5025 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5026 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5027 /*-
5028 * If we hit here, we had a ref count
5029 * up when the assoc was aborted and the
5030 * timer is clearing out the assoc, we should
5031 * NOT respond to any packet.. its OOTB.
5032 */
5033 SCTP_TCB_UNLOCK(stcb);
5034 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5035 vrf_id, port);
5036 goto out_now;
5037 }
5038 }
5039 if (IS_SCTP_CONTROL(ch)) {
5040 /* process the control portion of the SCTP packet */
5041 /* sa_ignore NO_NULL_CHK */
5042 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
5043 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port);
5044 if (stcb) {
5045 /*
5046 * This covers us if the cookie-echo was there and
5047 * it changes our INP.
5048 */
5049 inp = stcb->sctp_ep;
5050 if ((net) && (port)) {
5051 if (net->port == 0) {
5052 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5053 }
5054 net->port = port;
5055 }
5056 }
5057 } else {
5058 /*
5059 * no control chunks, so pre-process DATA chunks (these
5060 * checks are taken care of by control processing)
5061 */
5062
5063 /*
5064 * if DATA only packet, and auth is required, then punt...
5065 * can't have authenticated without any AUTH (control)
5066 * chunks
5067 */
5068 if ((stcb != NULL) &&
5069 !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5070 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5071 /* "silently" ignore */
5072 SCTP_STAT_INCR(sctps_recvauthmissing);
5073 SCTP_TCB_UNLOCK(stcb);
5074 goto out_now;
5075 }
5076 if (stcb == NULL) {
5077 /* out of the blue DATA chunk */
5078 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5079 vrf_id, port);
5080 goto out_now;
5081 }
5082 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5083 /* v_tag mismatch! */
5084 SCTP_STAT_INCR(sctps_badvtag);
5085 SCTP_TCB_UNLOCK(stcb);
5086 goto out_now;
5087 }
5088 }
5089
5090 if (stcb == NULL) {
5091 /*
5092 * no valid TCB for this packet, or we found it's a bad
5093 * packet while processing control, or we're done with this
5094 * packet (done or skip rest of data), so we drop it...
5095 */
5096 goto out_now;
5097 }
5098 /*
5099 * DATA chunk processing
5100 */
5101 /* plow through the data chunks while length > offset */
5102
5103 /*
5104 * Rest should be DATA only. Check authentication state if AUTH for
5105 * DATA is required.
5106 */
5107 if ((length > offset) &&
5108 (stcb != NULL) &&
5109 !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5110 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5111 !stcb->asoc.authenticated) {
5112 /* "silently" ignore */
5113 SCTP_STAT_INCR(sctps_recvauthmissing);
5114 SCTPDBG(SCTP_DEBUG_AUTH1,
5115 "Data chunk requires AUTH, skipped\n");
5116 goto trigger_send;
5117 }
5118 if (length > offset) {
5119 int retval;
5120
5121 /*
5122 * First check to make sure our state is correct. We would
5123 * not get here unless we really did have a tag, so we don't
5124 * abort if this happens, just dump the chunk silently.
5125 */
5126 switch (SCTP_GET_STATE(&stcb->asoc)) {
5127 case SCTP_STATE_COOKIE_ECHOED:
5128 /*
5129 * we consider data with valid tags in this state
5130 * shows us the cookie-ack was lost. Imply it was
5131 * there.
5132 */
5133 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5134 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5135 stcb->asoc.overall_error_count,
5136 0,
5137 SCTP_FROM_SCTP_INPUT,
5138 __LINE__);
5139 }
5140 stcb->asoc.overall_error_count = 0;
5141 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5142 break;
5143 case SCTP_STATE_COOKIE_WAIT:
5144 /*
5145 * We consider OOTB any data sent during asoc setup.
5146 */
5147 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL,
5148 vrf_id, port);
5149 SCTP_TCB_UNLOCK(stcb);
5150 goto out_now;
5151 /* sa_ignore NOTREACHED */
5152 break;
5153 case SCTP_STATE_EMPTY: /* should not happen */
5154 case SCTP_STATE_INUSE: /* should not happen */
5155 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */
5156 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5157 default:
5158 SCTP_TCB_UNLOCK(stcb);
5159 goto out_now;
5160 /* sa_ignore NOTREACHED */
5161 break;
5162 case SCTP_STATE_OPEN:
5163 case SCTP_STATE_SHUTDOWN_SENT:
5164 break;
5165 }
5166 /* take care of ECN, part 1. */
5167 if (stcb->asoc.ecn_allowed &&
5168 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) {
5169 sctp_process_ecn_marked_a(stcb, net, ecn_bits);
5170 }
5171 /* plow through the data chunks while length > offset */
5172 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
5173 inp, stcb, net, &high_tsn);
5174 if (retval == 2) {
5175 /*
5176 * The association aborted, NO UNLOCK needed since
5177 * the association is destroyed.
5178 */
5179 goto out_now;
5180 }
5181 data_processed = 1;
5182 if (retval == 0) {
5183 /* take care of ecn part 2. */
5184 if (stcb->asoc.ecn_allowed &&
5185 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) {
5186 sctp_process_ecn_marked_b(stcb, net, high_tsn,
5187 ecn_bits);
5188 }
5189 }
5190 /*
5191 * Anything important needs to have been m_copy'ed in
5192 * process_data
5193 */
5194 }
5195 if ((data_processed == 0) && (fwd_tsn_seen)) {
5196 int was_a_gap = 0;
5197
5198 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map,
5199 stcb->asoc.cumulative_tsn, MAX_TSN)) {
5200 /* there was a gap before this data was processed */
5201 was_a_gap = 1;
5202 }
5203 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag);
5204 if (abort_flag) {
5205 /* Again, we aborted so NO UNLOCK needed */
5206 goto out_now;
5207 }
5208 }
5209 /* trigger send of any chunks in queue... */
5210trigger_send:
5211#ifdef SCTP_AUDITING_ENABLED
5212 sctp_audit_log(0xE0, 2);
5213 sctp_auditing(1, inp, stcb, net);
5214#endif
5215 SCTPDBG(SCTP_DEBUG_INPUT1,
5216 "Check for chunk output prw:%d tqe:%d tf=%d\n",
5217 stcb->asoc.peers_rwnd,
5218 TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5219 stcb->asoc.total_flight);
5220 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5221
5222 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) ||
5223 ((un_sent) &&
5224 (stcb->asoc.peers_rwnd > 0 ||
5225 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5226 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5227 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5228 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5229 }
5230#ifdef SCTP_AUDITING_ENABLED
5231 sctp_audit_log(0xE0, 3);
5232 sctp_auditing(2, inp, stcb, net);
5233#endif
5234 SCTP_TCB_UNLOCK(stcb);
5235out_now:
5236#ifdef INVARIANTS
5237 sctp_validate_no_locks(inp);
5238#endif
5239 return;
5240}
5241
5242
5243void
5244sctp_input_with_port(i_pak, off, port)
5245 struct mbuf *i_pak;
5246 int off;
5247 uint16_t port;
5248{
5249#ifdef SCTP_MBUF_LOGGING
5250 struct mbuf *mat;
5251
5252#endif
5253 struct mbuf *m;
5254 int iphlen;
5255 uint32_t vrf_id = 0;
5256 uint8_t ecn_bits;
5257 struct ip *ip;
5258 struct sctphdr *sh;
5259 struct sctp_inpcb *inp = NULL;
5260
5261 uint32_t check, calc_check;
5262 struct sctp_nets *net;
5263 struct sctp_tcb *stcb = NULL;
5264 struct sctp_chunkhdr *ch;
5265 int refcount_up = 0;
5266 int length, mlen, offset;
5267
5268
5269 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5270 SCTP_RELEASE_PKT(i_pak);
5271 return;
5272 }
5273 mlen = SCTP_HEADER_LEN(i_pak);
5274 iphlen = off;
5275 m = SCTP_HEADER_TO_CHAIN(i_pak);
5276
5277 net = NULL;
5278 SCTP_STAT_INCR(sctps_recvpackets);
5279 SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5280
5281
5282#ifdef SCTP_MBUF_LOGGING
5283 /* Log in any input mbufs */
5284 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5285 mat = m;
5286 while (mat) {
5287 if (SCTP_BUF_IS_EXTENDED(mat)) {
5288 sctp_log_mb(mat, SCTP_MBUF_INPUT);
5289 }
5290 mat = SCTP_BUF_NEXT(mat);
5291 }
5292 }
5293#endif
5294#ifdef SCTP_PACKET_LOGGING
5295 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
5296 sctp_packet_log(m, mlen);
5297#endif
5298 /*
5299 * Must take out the iphlen, since mlen expects this (only effect lb
5300 * case)
5301 */
5302 mlen -= iphlen;
5303
5304 /*
5305 * Get IP, SCTP, and first chunk header together in first mbuf.
5306 */
5307 ip = mtod(m, struct ip *);
5308 offset = iphlen + sizeof(*sh) + sizeof(*ch);
5309 if (SCTP_BUF_LEN(m) < offset) {
5310 if ((m = m_pullup(m, offset)) == 0) {
5311 SCTP_STAT_INCR(sctps_hdrops);
5312 return;
5313 }
5314 ip = mtod(m, struct ip *);
5315 }
5316 sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5317 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
5318 SCTPDBG(SCTP_DEBUG_INPUT1,
5319 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen);
5320
5321 /* SCTP does not allow broadcasts or multicasts */
5322 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
5323 goto bad;
5324 }
5325 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) {
5326 /*
5327 * We only look at broadcast if its a front state, All
5328 * others we will not have a tcb for anyway.
5329 */
5330 goto bad;
5331 }
5332 /* validate SCTP checksum */
5333 check = sh->checksum; /* save incoming checksum */
5334 if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) &&
5335 ((ip->ip_src.s_addr == ip->ip_dst.s_addr) ||
5336 (SCTP_IS_IT_LOOPBACK(m)))
5337 ) {
5338 goto sctp_skip_csum_4;
5339 }
5340 sh->checksum = 0; /* prepare for calc */
5341 calc_check = sctp_calculate_sum(m, &mlen, iphlen);
5342 if (calc_check != check) {
5343 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n",
5344 calc_check, check, m, mlen, iphlen);
5345
5346 stcb = sctp_findassociation_addr(m, iphlen,
5347 offset - sizeof(*ch),
5348 sh, ch, &inp, &net,
5349 vrf_id);
5350 if ((net) && (port)) {
5351 if (net->port == 0) {
5352 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5353 }
5354 net->port = port;
5355 }
5356 if ((inp) && (stcb)) {
5357 sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
5358 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5359 } else if ((inp != NULL) && (stcb == NULL)) {
5360 refcount_up = 1;
5361 }
5362 SCTP_STAT_INCR(sctps_badsum);
5363 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5364 goto bad;
5365 }
5366 sh->checksum = calc_check;
5367sctp_skip_csum_4:
5368 /* destination port of 0 is illegal, based on RFC2960. */
5369 if (sh->dest_port == 0) {
5370 SCTP_STAT_INCR(sctps_hdrops);
5371 goto bad;
5372 }
5373 /* validate mbuf chain length with IP payload length */
5374 if (mlen < (ip->ip_len - iphlen)) {
5375 SCTP_STAT_INCR(sctps_hdrops);
5376 goto bad;
5377 }
5378 /*
5379 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
5380 * IP/SCTP/first chunk header...
5381 */
5382 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
5383 sh, ch, &inp, &net, vrf_id);
5384 if ((net) && (port)) {
5385 if (net->port == 0) {
5386 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr));
5387 }
5388 net->port = port;
5389 }
5390 /* inp's ref-count increased && stcb locked */
5391 if (inp == NULL) {
5392 struct sctp_init_chunk *init_chk, chunk_buf;
5393
5394 SCTP_STAT_INCR(sctps_noport);
5395#ifdef ICMP_BANDLIM
5396 /*
5397 * we use the bandwidth limiting to protect against sending
5398 * too many ABORTS all at once. In this case these count the
5399 * same as an ICMP message.
5400 */
5401 if (badport_bandlim(0) < 0)
5402 goto bad;
5403#endif /* ICMP_BANDLIM */
5404 SCTPDBG(SCTP_DEBUG_INPUT1,
5405 "Sending a ABORT from packet entry!\n");
5406 if (ch->chunk_type == SCTP_INITIATION) {
5407 /*
5408 * we do a trick here to get the INIT tag, dig in
5409 * and get the tag from the INIT and put it in the
5410 * common header.
5411 */
5412 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
5413 iphlen + sizeof(*sh), sizeof(*init_chk),
5414 (uint8_t *) & chunk_buf);
5415 if (init_chk != NULL)
5416 sh->v_tag = init_chk->init.initiate_tag;
5417 }
5418 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5419 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
5420 goto bad;
5421 }
5422 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5423 goto bad;
5424 }
5425 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
5426 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
5427 goto bad;
5428 } else if (stcb == NULL) {
5429 refcount_up = 1;
5430 }
5431#ifdef IPSEC
5432 /*
5433 * I very much doubt any of the IPSEC stuff will work but I have no
5434 * idea, so I will leave it in place.
5435 */
5436 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5437 ipsec4stat.in_polvio++;
5438 SCTP_STAT_INCR(sctps_hdrops);
5439 goto bad;
5440 }
5441#endif /* IPSEC */
5442
5443 /*
5444 * common chunk processing
5445 */
5446 length = ip->ip_len + iphlen;
5447 offset -= sizeof(struct sctp_chunkhdr);
5448
5449 ecn_bits = ip->ip_tos;
5450
5451 /* sa_ignore NO_NULL_CHK */
5452 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
5453 inp, stcb, net, ecn_bits, vrf_id, port);
5454 /* inp's ref-count reduced && stcb unlocked */
5455 if (m) {
5456 sctp_m_freem(m);
5457 }
5458 if ((inp) && (refcount_up)) {
5459 /* reduce ref-count */
5460 SCTP_INP_DECR_REF(inp);
5461 }
5462 return;
5463bad:
5464 if (stcb) {
5465 SCTP_TCB_UNLOCK(stcb);
5466 }
5467 if ((inp) && (refcount_up)) {
5468 /* reduce ref-count */
5469 SCTP_INP_DECR_REF(inp);
5470 }
5471 if (m) {
5472 sctp_m_freem(m);
5473 }
5474 return;
5475}
5476void
5477sctp_input(i_pak, off)
5478 struct mbuf *i_pak;
5479 int off;
5480{
5481 sctp_input_with_port(i_pak, off, 0);
5482}