1 /*-
2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * a) Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 *
12 * b) Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the distribution.
15 *
16 * c) Neither the name of Cisco Systems, Inc. nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30 * THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: releng/10.3/sys/netinet/sctp_input.c 296052 2016-02-25 18:46:06Z tuexen $");
35
36 #include <netinet/sctp_os.h>
37 #include <netinet/sctp_var.h>
38 #include <netinet/sctp_sysctl.h>
39 #include <netinet/sctp_pcb.h>
40 #include <netinet/sctp_header.h>
41 #include <netinet/sctputil.h>
42 #include <netinet/sctp_output.h>
43 #include <netinet/sctp_input.h>
44 #include <netinet/sctp_auth.h>
45 #include <netinet/sctp_indata.h>
46 #include <netinet/sctp_asconf.h>
47 #include <netinet/sctp_bsd_addr.h>
48 #include <netinet/sctp_timer.h>
49 #include <netinet/sctp_crc32.h>
50 #if defined(INET) || defined(INET6)
51 #include <netinet/udp.h>
52 #endif
53 #include <sys/smp.h>
54
55
56
57 static void
58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
59 {
60 struct sctp_nets *net;
61
62 /*
63 * This now not only stops all cookie timers it also stops any INIT
64 * timers as well. This will make sure that the timers are stopped
65 * in all collision cases.
66 */
67 SCTP_TCB_LOCK_ASSERT(stcb);
68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
71 stcb->sctp_ep,
72 stcb,
73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
76 stcb->sctp_ep,
77 stcb,
78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
79 }
80 }
81 }
82
83 /* INIT handler */
84 static void
85 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
86 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
87 struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
88 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
89 uint8_t mflowtype, uint32_t mflowid,
90 uint32_t vrf_id, uint16_t port)
91 {
92 struct sctp_init *init;
93 struct mbuf *op_err;
94
95 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
96 (void *)stcb);
97 if (stcb == NULL) {
98 SCTP_INP_RLOCK(inp);
99 }
100 /* validate length */
101 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
102 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
103 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
104 mflowtype, mflowid,
105 vrf_id, port);
106 if (stcb)
107 *abort_no_unlock = 1;
108 goto outnow;
109 }
110 /* validate parameters */
111 init = &cp->init;
112 if (init->initiate_tag == 0) {
113 /* protocol error... send abort */
114 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
115 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
116 mflowtype, mflowid,
117 vrf_id, port);
118 if (stcb)
119 *abort_no_unlock = 1;
120 goto outnow;
121 }
122 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
123 /* invalid parameter... send abort */
124 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
125 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
126 mflowtype, mflowid,
127 vrf_id, port);
128 if (stcb)
129 *abort_no_unlock = 1;
130 goto outnow;
131 }
132 if (init->num_inbound_streams == 0) {
133 /* protocol error... send abort */
134 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
135 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
136 mflowtype, mflowid,
137 vrf_id, port);
138 if (stcb)
139 *abort_no_unlock = 1;
140 goto outnow;
141 }
142 if (init->num_outbound_streams == 0) {
143 /* protocol error... send abort */
144 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
145 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
146 mflowtype, mflowid,
147 vrf_id, port);
148 if (stcb)
149 *abort_no_unlock = 1;
150 goto outnow;
151 }
152 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
153 offset + ntohs(cp->ch.chunk_length))) {
154 /* auth parameter(s) error... send abort */
155 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
156 "Problem with AUTH parameters");
157 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
158 mflowtype, mflowid,
159 vrf_id, port);
160 if (stcb)
161 *abort_no_unlock = 1;
162 goto outnow;
163 }
164 /*
165 * We are only accepting if we have a socket with positive
166 * so_qlimit.
167 */
168 if ((stcb == NULL) &&
169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
171 (inp->sctp_socket == NULL) ||
172 (inp->sctp_socket->so_qlimit == 0))) {
173 /*
174 * FIX ME ?? What about TCP model and we have a
175 * match/restart case? Actually no fix is needed. the lookup
176 * will always find the existing assoc so stcb would not be
177 * NULL. It may be questionable to do this since we COULD
178 * just send back the INIT-ACK and hope that the app did
179 * accept()'s by the time the COOKIE was sent. But there is
180 * a price to pay for COOKIE generation and I don't want to
181 * pay it on the chance that the app will actually do some
182 * accepts(). The App just looses and should NOT be in this
183 * state :-)
184 */
185 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
186 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
187 "No listener");
188 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
189 mflowtype, mflowid, inp->fibnum,
190 vrf_id, port);
191 }
192 goto outnow;
193 }
194 if ((stcb != NULL) &&
195 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
196 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
197 sctp_send_shutdown_ack(stcb, NULL);
198 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
199 } else {
200 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
201 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
202 src, dst, sh, cp,
203 mflowtype, mflowid,
204 vrf_id, port,
205 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
206 }
207 outnow:
208 if (stcb == NULL) {
209 SCTP_INP_RUNLOCK(inp);
210 }
211 }
212
213 /*
214 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
215 */
216
217 int
218 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
219 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
220 SCTP_UNUSED
221 #endif
222 )
223 {
224 int unsent_data = 0;
225 unsigned int i;
226 struct sctp_stream_queue_pending *sp;
227 struct sctp_association *asoc;
228
229 /*
230 * This function returns the number of streams that have true unsent
231 * data on them. Note that as it looks through it will clean up any
232 * places that have old data that has been sent but left at top of
233 * stream queue.
234 */
235 asoc = &stcb->asoc;
236 SCTP_TCB_SEND_LOCK(stcb);
237 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
238 /* Check to see if some data queued */
239 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
240 /* sa_ignore FREED_MEMORY */
241 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
242 if (sp == NULL) {
243 continue;
244 }
245 if ((sp->msg_is_complete) &&
246 (sp->length == 0) &&
247 (sp->sender_all_done)) {
248 /*
249 * We are doing differed cleanup. Last time
250 * through when we took all the data the
251 * sender_all_done was not set.
252 */
253 if (sp->put_last_out == 0) {
254 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
255 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
256 sp->sender_all_done,
257 sp->length,
258 sp->msg_is_complete,
259 sp->put_last_out);
260 }
261 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
262 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
263 if (sp->net) {
264 sctp_free_remote_addr(sp->net);
265 sp->net = NULL;
266 }
267 if (sp->data) {
268 sctp_m_freem(sp->data);
269 sp->data = NULL;
270 }
271 sctp_free_a_strmoq(stcb, sp, so_locked);
272 } else {
273 unsent_data++;
274 break;
275 }
276 }
277 }
278 SCTP_TCB_SEND_UNLOCK(stcb);
279 return (unsent_data);
280 }
281
282 static int
283 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
284 {
285 struct sctp_init *init;
286 struct sctp_association *asoc;
287 struct sctp_nets *lnet;
288 unsigned int i;
289
290 init = &cp->init;
291 asoc = &stcb->asoc;
292 /* save off parameters */
293 asoc->peer_vtag = ntohl(init->initiate_tag);
294 asoc->peers_rwnd = ntohl(init->a_rwnd);
295 /* init tsn's */
296 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
297
298 if (!TAILQ_EMPTY(&asoc->nets)) {
299 /* update any ssthresh's that may have a default */
300 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
301 lnet->ssthresh = asoc->peers_rwnd;
302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
303 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
304 }
305 }
306 }
307 SCTP_TCB_SEND_LOCK(stcb);
308 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
309 unsigned int newcnt;
310 struct sctp_stream_out *outs;
311 struct sctp_stream_queue_pending *sp, *nsp;
312 struct sctp_tmit_chunk *chk, *nchk;
313
314 /* abandon the upper streams */
315 newcnt = ntohs(init->num_inbound_streams);
316 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
317 if (chk->rec.data.stream_number >= newcnt) {
318 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
319 asoc->send_queue_cnt--;
320 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
321 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
322 #ifdef INVARIANTS
323 } else {
324 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
325 #endif
326 }
327 if (chk->data != NULL) {
328 sctp_free_bufspace(stcb, asoc, chk, 1);
329 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
330 0, chk, SCTP_SO_NOT_LOCKED);
331 if (chk->data) {
332 sctp_m_freem(chk->data);
333 chk->data = NULL;
334 }
335 }
336 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
337 /* sa_ignore FREED_MEMORY */
338 }
339 }
340 if (asoc->strmout) {
341 for (i = newcnt; i < asoc->pre_open_streams; i++) {
342 outs = &asoc->strmout[i];
343 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
344 TAILQ_REMOVE(&outs->outqueue, sp, next);
345 asoc->stream_queue_cnt--;
346 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
347 stcb, 0, sp, SCTP_SO_NOT_LOCKED);
348 if (sp->data) {
349 sctp_m_freem(sp->data);
350 sp->data = NULL;
351 }
352 if (sp->net) {
353 sctp_free_remote_addr(sp->net);
354 sp->net = NULL;
355 }
356 /* Free the chunk */
357 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
358 /* sa_ignore FREED_MEMORY */
359 }
360 outs->state = SCTP_STREAM_CLOSED;
361 }
362 }
363 /* cut back the count */
364 asoc->pre_open_streams = newcnt;
365 }
366 SCTP_TCB_SEND_UNLOCK(stcb);
367 asoc->streamoutcnt = asoc->pre_open_streams;
368 if (asoc->strmout) {
369 for (i = 0; i < asoc->streamoutcnt; i++) {
370 asoc->strmout[i].state = SCTP_STREAM_OPEN;
371 }
372 }
373 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
374 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
375 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
376 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
377 }
378 /* This is the next one we expect */
379 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
380
381 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
382 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
383
384 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
385 /* open the requested streams */
386
387 if (asoc->strmin != NULL) {
388 /* Free the old ones */
389 struct sctp_queued_to_read *ctl, *nctl;
390
391 for (i = 0; i < asoc->streamincnt; i++) {
392 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
393 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
394 sctp_free_remote_addr(ctl->whoFrom);
395 ctl->whoFrom = NULL;
396 sctp_m_freem(ctl->data);
397 ctl->data = NULL;
398 sctp_free_a_readq(stcb, ctl);
399 }
400 }
401 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
402 }
403 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
404 asoc->streamincnt = ntohs(init->num_outbound_streams);
405 } else {
406 asoc->streamincnt = asoc->max_inbound_streams;
407 }
408 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
409 sizeof(struct sctp_stream_in), SCTP_M_STRMI);
410 if (asoc->strmin == NULL) {
411 /* we didn't get memory for the streams! */
412 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
413 return (-1);
414 }
415 for (i = 0; i < asoc->streamincnt; i++) {
416 asoc->strmin[i].stream_no = i;
417 asoc->strmin[i].last_sequence_delivered = 0xffff;
418 TAILQ_INIT(&asoc->strmin[i].inqueue);
419 asoc->strmin[i].delivery_started = 0;
420 }
421 /*
422 * load_address_from_init will put the addresses into the
423 * association when the COOKIE is processed or the INIT-ACK is
424 * processed. Both types of COOKIE's existing and new call this
425 * routine. It will remove addresses that are no longer in the
426 * association (for the restarting case where addresses are
427 * removed). Up front when the INIT arrives we will discard it if it
428 * is a restart and new addresses have been added.
429 */
430 /* sa_ignore MEMLEAK */
431 return (0);
432 }
433
434 /*
435 * INIT-ACK message processing/consumption returns value < 0 on error
436 */
437 static int
438 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
439 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
440 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
441 struct sctp_nets *net, int *abort_no_unlock,
442 uint8_t mflowtype, uint32_t mflowid,
443 uint32_t vrf_id)
444 {
445 struct sctp_association *asoc;
446 struct mbuf *op_err;
447 int retval, abort_flag;
448 uint32_t initack_limit;
449 int nat_friendly = 0;
450
451 /* First verify that we have no illegal param's */
452 abort_flag = 0;
453
454 op_err = sctp_arethere_unrecognized_parameters(m,
455 (offset + sizeof(struct sctp_init_chunk)),
456 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
457 if (abort_flag) {
458 /* Send an abort and notify peer */
459 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
460 *abort_no_unlock = 1;
461 return (-1);
462 }
463 asoc = &stcb->asoc;
464 asoc->peer_supports_nat = (uint8_t) nat_friendly;
465 /* process the peer's parameters in the INIT-ACK */
466 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
467 if (retval < 0) {
468 return (retval);
469 }
470 initack_limit = offset + ntohs(cp->ch.chunk_length);
471 /* load all addresses */
472 if ((retval = sctp_load_addresses_from_init(stcb, m,
473 (offset + sizeof(struct sctp_init_chunk)), initack_limit,
474 src, dst, NULL))) {
475 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
476 "Problem with address parameters");
477 SCTPDBG(SCTP_DEBUG_INPUT1,
478 "Load addresses from INIT causes an abort %d\n",
479 retval);
480 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
481 src, dst, sh, op_err,
482 mflowtype, mflowid,
483 vrf_id, net->port);
484 *abort_no_unlock = 1;
485 return (-1);
486 }
487 /* if the peer doesn't support asconf, flush the asconf queue */
488 if (asoc->asconf_supported == 0) {
489 struct sctp_asconf_addr *param, *nparam;
490
491 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
492 TAILQ_REMOVE(&asoc->asconf_queue, param, next);
493 SCTP_FREE(param, SCTP_M_ASC_ADDR);
494 }
495 }
496 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
497 stcb->asoc.local_hmacs);
498 if (op_err) {
499 sctp_queue_op_err(stcb, op_err);
500 /* queuing will steal away the mbuf chain to the out queue */
501 op_err = NULL;
502 }
503 /* extract the cookie and queue it to "echo" it back... */
504 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
505 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
506 stcb->asoc.overall_error_count,
507 0,
508 SCTP_FROM_SCTP_INPUT,
509 __LINE__);
510 }
511 stcb->asoc.overall_error_count = 0;
512 net->error_count = 0;
513
514 /*
515 * Cancel the INIT timer, We do this first before queueing the
516 * cookie. We always cancel at the primary to assue that we are
517 * canceling the timer started by the INIT which always goes to the
518 * primary.
519 */
520 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
521 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
522
523 /* calculate the RTO */
524 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
525 SCTP_RTT_FROM_NON_DATA);
526 retval = sctp_send_cookie_echo(m, offset, stcb, net);
527 if (retval < 0) {
528 /*
529 * No cookie, we probably should send a op error. But in any
530 * case if there is no cookie in the INIT-ACK, we can
531 * abandon the peer, its broke.
532 */
533 if (retval == -3) {
534 uint16_t len;
535
536 len = (uint16_t) (sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
537 /* We abort with an error of missing mandatory param */
538 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
539 if (op_err != NULL) {
540 struct sctp_error_missing_param *cause;
541
542 SCTP_BUF_LEN(op_err) = len;
543 cause = mtod(op_err, struct sctp_error_missing_param *);
544 /* Subtract the reserved param */
545 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
546 cause->cause.length = htons(len);
547 cause->num_missing_params = htonl(1);
548 cause->type[0] = htons(SCTP_STATE_COOKIE);
549 }
550 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
551 src, dst, sh, op_err,
552 mflowtype, mflowid,
553 vrf_id, net->port);
554 *abort_no_unlock = 1;
555 }
556 return (retval);
557 }
558 return (0);
559 }
560
561 static void
562 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
563 struct sctp_tcb *stcb, struct sctp_nets *net)
564 {
565 union sctp_sockstore store;
566 struct sctp_nets *r_net, *f_net;
567 struct timeval tv;
568 int req_prim = 0;
569 uint16_t old_error_counter;
570
571 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
572 /* Invalid length */
573 return;
574 }
575 memset(&store, 0, sizeof(store));
576 switch (cp->heartbeat.hb_info.addr_family) {
577 #ifdef INET
578 case AF_INET:
579 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
580 store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
581 store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
582 store.sin.sin_port = stcb->rport;
583 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
584 sizeof(store.sin.sin_addr));
585 } else {
586 return;
587 }
588 break;
589 #endif
590 #ifdef INET6
591 case AF_INET6:
592 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
593 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
594 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
595 store.sin6.sin6_port = stcb->rport;
596 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
597 } else {
598 return;
599 }
600 break;
601 #endif
602 default:
603 return;
604 }
605 r_net = sctp_findnet(stcb, &store.sa);
606 if (r_net == NULL) {
607 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
608 return;
609 }
610 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
611 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
612 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
613 /*
614 * If the its a HB and it's random value is correct when can
615 * confirm the destination.
616 */
617 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
618 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
619 stcb->asoc.primary_destination = r_net;
620 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
621 f_net = TAILQ_FIRST(&stcb->asoc.nets);
622 if (f_net != r_net) {
623 /*
624 * first one on the list is NOT the primary
625 * sctp_cmpaddr() is much more efficent if
626 * the primary is the first on the list,
627 * make it so.
628 */
629 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
630 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
631 }
632 req_prim = 1;
633 }
634 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
635 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
636 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
637 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
638 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
639 }
640 old_error_counter = r_net->error_count;
641 r_net->error_count = 0;
642 r_net->hb_responded = 1;
643 tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
644 tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
645 /* Now lets do a RTO with this */
646 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
647 SCTP_RTT_FROM_NON_DATA);
648 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
649 r_net->dest_state |= SCTP_ADDR_REACHABLE;
650 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
651 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
652 }
653 if (r_net->dest_state & SCTP_ADDR_PF) {
654 r_net->dest_state &= ~SCTP_ADDR_PF;
655 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
656 }
657 if (old_error_counter > 0) {
658 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
659 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
660 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
661 }
662 if (r_net == stcb->asoc.primary_destination) {
663 if (stcb->asoc.alternate) {
664 /* release the alternate, primary is good */
665 sctp_free_remote_addr(stcb->asoc.alternate);
666 stcb->asoc.alternate = NULL;
667 }
668 }
669 /* Mobility adaptation */
670 if (req_prim) {
671 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
672 SCTP_MOBILITY_BASE) ||
673 sctp_is_mobility_feature_on(stcb->sctp_ep,
674 SCTP_MOBILITY_FASTHANDOFF)) &&
675 sctp_is_mobility_feature_on(stcb->sctp_ep,
676 SCTP_MOBILITY_PRIM_DELETED)) {
677
678 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
679 stcb->sctp_ep, stcb, NULL,
680 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
681 if (sctp_is_mobility_feature_on(stcb->sctp_ep,
682 SCTP_MOBILITY_FASTHANDOFF)) {
683 sctp_assoc_immediate_retrans(stcb,
684 stcb->asoc.primary_destination);
685 }
686 if (sctp_is_mobility_feature_on(stcb->sctp_ep,
687 SCTP_MOBILITY_BASE)) {
688 sctp_move_chunks_from_net(stcb,
689 stcb->asoc.deleted_primary);
690 }
691 sctp_delete_prim_timer(stcb->sctp_ep, stcb,
692 stcb->asoc.deleted_primary);
693 }
694 }
695 }
696
697 static int
698 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
699 {
700 /*
701 * return 0 means we want you to proceed with the abort non-zero
702 * means no abort processing
703 */
704 struct sctpasochead *head;
705
706 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
707 /* generate a new vtag and send init */
708 LIST_REMOVE(stcb, sctp_asocs);
709 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
710 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
711 /*
712 * put it in the bucket in the vtag hash of assoc's for the
713 * system
714 */
715 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
716 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
717 return (1);
718 }
719 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
720 /*
721 * treat like a case where the cookie expired i.e.: - dump
722 * current cookie. - generate a new vtag. - resend init.
723 */
724 /* generate a new vtag and send init */
725 LIST_REMOVE(stcb, sctp_asocs);
726 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
727 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
728 sctp_stop_all_cookie_timers(stcb);
729 sctp_toss_old_cookies(stcb, &stcb->asoc);
730 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
731 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
732 /*
733 * put it in the bucket in the vtag hash of assoc's for the
734 * system
735 */
736 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
737 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
738 return (1);
739 }
740 return (0);
741 }
742
743 static int
744 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
745 struct sctp_nets *net)
746 {
747 /*
748 * return 0 means we want you to proceed with the abort non-zero
749 * means no abort processing
750 */
751 if (stcb->asoc.auth_supported == 0) {
752 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
753 return (0);
754 }
755 sctp_asconf_send_nat_state_update(stcb, net);
756 return (1);
757 }
758
759
760 static void
761 sctp_handle_abort(struct sctp_abort_chunk *abort,
762 struct sctp_tcb *stcb, struct sctp_nets *net)
763 {
764 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
765 struct socket *so;
766
767 #endif
768 uint16_t len;
769 uint16_t error;
770
771 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
772 if (stcb == NULL)
773 return;
774
775 len = ntohs(abort->ch.chunk_length);
776 if (len > sizeof(struct sctp_chunkhdr)) {
777 /*
778 * Need to check the cause codes for our two magic nat
779 * aborts which don't kill the assoc necessarily.
780 */
781 struct sctp_gen_error_cause *cause;
782
783 cause = (struct sctp_gen_error_cause *)(abort + 1);
784 error = ntohs(cause->code);
785 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
786 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
787 abort->ch.chunk_flags);
788 if (sctp_handle_nat_colliding_state(stcb)) {
789 return;
790 }
791 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
792 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
793 abort->ch.chunk_flags);
794 if (sctp_handle_nat_missing_state(stcb, net)) {
795 return;
796 }
797 }
798 } else {
799 error = 0;
800 }
801 /* stop any receive timers */
802 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
803 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
804 /* notify user of the abort and clean up... */
805 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
806 /* free the tcb */
807 SCTP_STAT_INCR_COUNTER32(sctps_aborted);
808 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
809 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
810 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
811 }
812 #ifdef SCTP_ASOCLOG_OF_TSNS
813 sctp_print_out_track_log(stcb);
814 #endif
815 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
816 so = SCTP_INP_SO(stcb->sctp_ep);
817 atomic_add_int(&stcb->asoc.refcnt, 1);
818 SCTP_TCB_UNLOCK(stcb);
819 SCTP_SOCKET_LOCK(so, 1);
820 SCTP_TCB_LOCK(stcb);
821 atomic_subtract_int(&stcb->asoc.refcnt, 1);
822 #endif
823 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
824 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
825 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
826 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
827 SCTP_SOCKET_UNLOCK(so, 1);
828 #endif
829 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
830 }
831
832 static void
833 sctp_start_net_timers(struct sctp_tcb *stcb)
834 {
835 uint32_t cnt_hb_sent;
836 struct sctp_nets *net;
837
838 cnt_hb_sent = 0;
839 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
840 /*
841 * For each network start: 1) A pmtu timer. 2) A HB timer 3)
842 * If the dest in unconfirmed send a hb as well if under
843 * max_hb_burst have been sent.
844 */
845 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
846 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
847 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
848 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
849 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
850 cnt_hb_sent++;
851 }
852 }
853 if (cnt_hb_sent) {
854 sctp_chunk_output(stcb->sctp_ep, stcb,
855 SCTP_OUTPUT_FROM_COOKIE_ACK,
856 SCTP_SO_NOT_LOCKED);
857 }
858 }
859
860
861 static void
862 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
863 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
864 {
865 struct sctp_association *asoc;
866 int some_on_streamwheel;
867 int old_state;
868
869 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
870 struct socket *so;
871
872 #endif
873
874 SCTPDBG(SCTP_DEBUG_INPUT2,
875 "sctp_handle_shutdown: handling SHUTDOWN\n");
876 if (stcb == NULL)
877 return;
878 asoc = &stcb->asoc;
879 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
880 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
881 return;
882 }
883 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
884 /* Shutdown NOT the expected size */
885 return;
886 }
887 old_state = SCTP_GET_STATE(asoc);
888 sctp_update_acked(stcb, cp, abort_flag);
889 if (*abort_flag) {
890 return;
891 }
892 if (asoc->control_pdapi) {
893 /*
894 * With a normal shutdown we assume the end of last record.
895 */
896 SCTP_INP_READ_LOCK(stcb->sctp_ep);
897 asoc->control_pdapi->end_added = 1;
898 asoc->control_pdapi->pdapi_aborted = 1;
899 asoc->control_pdapi = NULL;
900 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
901 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
902 so = SCTP_INP_SO(stcb->sctp_ep);
903 atomic_add_int(&stcb->asoc.refcnt, 1);
904 SCTP_TCB_UNLOCK(stcb);
905 SCTP_SOCKET_LOCK(so, 1);
906 SCTP_TCB_LOCK(stcb);
907 atomic_subtract_int(&stcb->asoc.refcnt, 1);
908 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
909 /* assoc was freed while we were unlocked */
910 SCTP_SOCKET_UNLOCK(so, 1);
911 return;
912 }
913 #endif
914 if (stcb->sctp_socket) {
915 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
916 }
917 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
918 SCTP_SOCKET_UNLOCK(so, 1);
919 #endif
920 }
921 /* goto SHUTDOWN_RECEIVED state to block new requests */
922 if (stcb->sctp_socket) {
923 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
924 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
925 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
926 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
927 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
928 /*
929 * notify upper layer that peer has initiated a
930 * shutdown
931 */
932 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
933
934 /* reset time */
935 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
936 }
937 }
938 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
939 /*
940 * stop the shutdown timer, since we WILL move to
941 * SHUTDOWN-ACK-SENT.
942 */
943 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
944 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
945 }
946 /* Now is there unsent data on a stream somewhere? */
947 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
948
949 if (!TAILQ_EMPTY(&asoc->send_queue) ||
950 !TAILQ_EMPTY(&asoc->sent_queue) ||
951 some_on_streamwheel) {
952 /* By returning we will push more data out */
953 return;
954 } else {
955 /* no outstanding data to send, so move on... */
956 /* send SHUTDOWN-ACK */
957 /* move to SHUTDOWN-ACK-SENT state */
958 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
959 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
960 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
961 }
962 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
963 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
964 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
965 sctp_stop_timers_for_shutdown(stcb);
966 sctp_send_shutdown_ack(stcb, net);
967 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
968 stcb->sctp_ep, stcb, net);
969 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
970 sctp_send_shutdown_ack(stcb, net);
971 }
972 }
973 }
974
975 static void
976 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
977 struct sctp_tcb *stcb,
978 struct sctp_nets *net)
979 {
980 struct sctp_association *asoc;
981
982 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
983 struct socket *so;
984
985 so = SCTP_INP_SO(stcb->sctp_ep);
986 #endif
987 SCTPDBG(SCTP_DEBUG_INPUT2,
988 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
989 if (stcb == NULL)
990 return;
991
992 asoc = &stcb->asoc;
993 /* process according to association state */
994 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
995 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
996 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
997 sctp_send_shutdown_complete(stcb, net, 1);
998 SCTP_TCB_UNLOCK(stcb);
999 return;
1000 }
1001 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
1002 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1003 /* unexpected SHUTDOWN-ACK... so ignore... */
1004 SCTP_TCB_UNLOCK(stcb);
1005 return;
1006 }
1007 if (asoc->control_pdapi) {
1008 /*
1009 * With a normal shutdown we assume the end of last record.
1010 */
1011 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1012 asoc->control_pdapi->end_added = 1;
1013 asoc->control_pdapi->pdapi_aborted = 1;
1014 asoc->control_pdapi = NULL;
1015 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1016 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1017 atomic_add_int(&stcb->asoc.refcnt, 1);
1018 SCTP_TCB_UNLOCK(stcb);
1019 SCTP_SOCKET_LOCK(so, 1);
1020 SCTP_TCB_LOCK(stcb);
1021 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1022 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1023 /* assoc was freed while we were unlocked */
1024 SCTP_SOCKET_UNLOCK(so, 1);
1025 return;
1026 }
1027 #endif
1028 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1029 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1030 SCTP_SOCKET_UNLOCK(so, 1);
1031 #endif
1032 }
1033 #ifdef INVARIANTS
1034 if (!TAILQ_EMPTY(&asoc->send_queue) ||
1035 !TAILQ_EMPTY(&asoc->sent_queue) ||
1036 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1037 panic("Queues are not empty when handling SHUTDOWN-ACK");
1038 }
1039 #endif
1040 /* stop the timer */
1041 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1042 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1043 /* send SHUTDOWN-COMPLETE */
1044 sctp_send_shutdown_complete(stcb, net, 0);
1045 /* notify upper layer protocol */
1046 if (stcb->sctp_socket) {
1047 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1048 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1049 stcb->sctp_socket->so_snd.sb_cc = 0;
1050 }
1051 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1052 }
1053 SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1054 /* free the TCB but first save off the ep */
1055 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1056 atomic_add_int(&stcb->asoc.refcnt, 1);
1057 SCTP_TCB_UNLOCK(stcb);
1058 SCTP_SOCKET_LOCK(so, 1);
1059 SCTP_TCB_LOCK(stcb);
1060 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1061 #endif
1062 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1063 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1064 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1065 SCTP_SOCKET_UNLOCK(so, 1);
1066 #endif
1067 }
1068
1069 /*
1070 * Skip past the param header and then we will find the chunk that caused the
1071 * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1072 * our peer must be broken.
1073 */
1074 static void
1075 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1076 struct sctp_nets *net)
1077 {
1078 struct sctp_chunkhdr *chk;
1079
1080 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1081 switch (chk->chunk_type) {
1082 case SCTP_ASCONF_ACK:
1083 case SCTP_ASCONF:
1084 sctp_asconf_cleanup(stcb, net);
1085 break;
1086 case SCTP_FORWARD_CUM_TSN:
1087 stcb->asoc.prsctp_supported = 0;
1088 break;
1089 default:
1090 SCTPDBG(SCTP_DEBUG_INPUT2,
1091 "Peer does not support chunk type %d(%x)??\n",
1092 chk->chunk_type, (uint32_t) chk->chunk_type);
1093 break;
1094 }
1095 }
1096
1097 /*
1098 * Skip past the param header and then we will find the param that caused the
1099 * problem. There are a number of param's in a ASCONF OR the prsctp param
1100 * these will turn of specific features.
1101 * XXX: Is this the right thing to do?
1102 */
1103 static void
1104 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1105 {
1106 struct sctp_paramhdr *pbad;
1107
1108 pbad = phdr + 1;
1109 switch (ntohs(pbad->param_type)) {
1110 /* pr-sctp draft */
1111 case SCTP_PRSCTP_SUPPORTED:
1112 stcb->asoc.prsctp_supported = 0;
1113 break;
1114 case SCTP_SUPPORTED_CHUNK_EXT:
1115 break;
1116 /* draft-ietf-tsvwg-addip-sctp */
1117 case SCTP_HAS_NAT_SUPPORT:
1118 stcb->asoc.peer_supports_nat = 0;
1119 break;
1120 case SCTP_ADD_IP_ADDRESS:
1121 case SCTP_DEL_IP_ADDRESS:
1122 case SCTP_SET_PRIM_ADDR:
1123 stcb->asoc.asconf_supported = 0;
1124 break;
1125 case SCTP_SUCCESS_REPORT:
1126 case SCTP_ERROR_CAUSE_IND:
1127 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1128 SCTPDBG(SCTP_DEBUG_INPUT2,
1129 "Turning off ASCONF to this strange peer\n");
1130 stcb->asoc.asconf_supported = 0;
1131 break;
1132 default:
1133 SCTPDBG(SCTP_DEBUG_INPUT2,
1134 "Peer does not support param type %d(%x)??\n",
1135 pbad->param_type, (uint32_t) pbad->param_type);
1136 break;
1137 }
1138 }
1139
1140 static int
1141 sctp_handle_error(struct sctp_chunkhdr *ch,
1142 struct sctp_tcb *stcb, struct sctp_nets *net)
1143 {
1144 int chklen;
1145 struct sctp_paramhdr *phdr;
1146 uint16_t error, error_type;
1147 uint16_t error_len;
1148 struct sctp_association *asoc;
1149 int adjust;
1150
1151 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1152 struct socket *so;
1153
1154 #endif
1155
1156 /* parse through all of the errors and process */
1157 asoc = &stcb->asoc;
1158 phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1159 sizeof(struct sctp_chunkhdr));
1160 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1161 error = 0;
1162 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1163 /* Process an Error Cause */
1164 error_type = ntohs(phdr->param_type);
1165 error_len = ntohs(phdr->param_length);
1166 if ((error_len > chklen) || (error_len == 0)) {
1167 /* invalid param length for this param */
1168 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1169 chklen, error_len);
1170 return (0);
1171 }
1172 if (error == 0) {
1173 /* report the first error cause */
1174 error = error_type;
1175 }
1176 switch (error_type) {
1177 case SCTP_CAUSE_INVALID_STREAM:
1178 case SCTP_CAUSE_MISSING_PARAM:
1179 case SCTP_CAUSE_INVALID_PARAM:
1180 case SCTP_CAUSE_NO_USER_DATA:
1181 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1182 error_type);
1183 break;
1184 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1185 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1186 ch->chunk_flags);
1187 if (sctp_handle_nat_colliding_state(stcb)) {
1188 return (0);
1189 }
1190 break;
1191 case SCTP_CAUSE_NAT_MISSING_STATE:
1192 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1193 ch->chunk_flags);
1194 if (sctp_handle_nat_missing_state(stcb, net)) {
1195 return (0);
1196 }
1197 break;
1198 case SCTP_CAUSE_STALE_COOKIE:
1199 /*
1200 * We only act if we have echoed a cookie and are
1201 * waiting.
1202 */
1203 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1204 int *p;
1205
1206 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1207 /* Save the time doubled */
1208 asoc->cookie_preserve_req = ntohl(*p) << 1;
1209 asoc->stale_cookie_count++;
1210 if (asoc->stale_cookie_count >
1211 asoc->max_init_times) {
1212 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1213 /* now free the asoc */
1214 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1215 so = SCTP_INP_SO(stcb->sctp_ep);
1216 atomic_add_int(&stcb->asoc.refcnt, 1);
1217 SCTP_TCB_UNLOCK(stcb);
1218 SCTP_SOCKET_LOCK(so, 1);
1219 SCTP_TCB_LOCK(stcb);
1220 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1221 #endif
1222 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1223 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1224 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1225 SCTP_SOCKET_UNLOCK(so, 1);
1226 #endif
1227 return (-1);
1228 }
1229 /* blast back to INIT state */
1230 sctp_toss_old_cookies(stcb, &stcb->asoc);
1231 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1232 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1233 sctp_stop_all_cookie_timers(stcb);
1234 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1235 }
1236 break;
1237 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1238 /*
1239 * Nothing we can do here, we don't do hostname
1240 * addresses so if the peer does not like my IPv6
1241 * (or IPv4 for that matter) it does not matter. If
1242 * they don't support that type of address, they can
1243 * NOT possibly get that packet type... i.e. with no
1244 * IPv6 you can't recieve a IPv6 packet. so we can
1245 * safely ignore this one. If we ever added support
1246 * for HOSTNAME Addresses, then we would need to do
1247 * something here.
1248 */
1249 break;
1250 case SCTP_CAUSE_UNRECOG_CHUNK:
1251 sctp_process_unrecog_chunk(stcb, phdr, net);
1252 break;
1253 case SCTP_CAUSE_UNRECOG_PARAM:
1254 sctp_process_unrecog_param(stcb, phdr);
1255 break;
1256 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1257 /*
1258 * We ignore this since the timer will drive out a
1259 * new cookie anyway and there timer will drive us
1260 * to send a SHUTDOWN_COMPLETE. We can't send one
1261 * here since we don't have their tag.
1262 */
1263 break;
1264 case SCTP_CAUSE_DELETING_LAST_ADDR:
1265 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1266 case SCTP_CAUSE_DELETING_SRC_ADDR:
1267 /*
1268 * We should NOT get these here, but in a
1269 * ASCONF-ACK.
1270 */
1271 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1272 error_type);
1273 break;
1274 case SCTP_CAUSE_OUT_OF_RESC:
1275 /*
1276 * And what, pray tell do we do with the fact that
1277 * the peer is out of resources? Not really sure we
1278 * could do anything but abort. I suspect this
1279 * should have came WITH an abort instead of in a
1280 * OP-ERROR.
1281 */
1282 break;
1283 default:
1284 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1285 error_type);
1286 break;
1287 }
1288 adjust = SCTP_SIZE32(error_len);
1289 chklen -= adjust;
1290 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1291 }
1292 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1293 return (0);
1294 }
1295
1296 static int
1297 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1298 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1299 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1300 struct sctp_nets *net, int *abort_no_unlock,
1301 uint8_t mflowtype, uint32_t mflowid,
1302 uint32_t vrf_id)
1303 {
1304 struct sctp_init_ack *init_ack;
1305 struct mbuf *op_err;
1306
1307 SCTPDBG(SCTP_DEBUG_INPUT2,
1308 "sctp_handle_init_ack: handling INIT-ACK\n");
1309
1310 if (stcb == NULL) {
1311 SCTPDBG(SCTP_DEBUG_INPUT2,
1312 "sctp_handle_init_ack: TCB is null\n");
1313 return (-1);
1314 }
1315 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1316 /* Invalid length */
1317 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1318 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1319 src, dst, sh, op_err,
1320 mflowtype, mflowid,
1321 vrf_id, net->port);
1322 *abort_no_unlock = 1;
1323 return (-1);
1324 }
1325 init_ack = &cp->init;
1326 /* validate parameters */
1327 if (init_ack->initiate_tag == 0) {
1328 /* protocol error... send an abort */
1329 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1330 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1331 src, dst, sh, op_err,
1332 mflowtype, mflowid,
1333 vrf_id, net->port);
1334 *abort_no_unlock = 1;
1335 return (-1);
1336 }
1337 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1338 /* protocol error... send an abort */
1339 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1340 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1341 src, dst, sh, op_err,
1342 mflowtype, mflowid,
1343 vrf_id, net->port);
1344 *abort_no_unlock = 1;
1345 return (-1);
1346 }
1347 if (init_ack->num_inbound_streams == 0) {
1348 /* protocol error... send an abort */
1349 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1350 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1351 src, dst, sh, op_err,
1352 mflowtype, mflowid,
1353 vrf_id, net->port);
1354 *abort_no_unlock = 1;
1355 return (-1);
1356 }
1357 if (init_ack->num_outbound_streams == 0) {
1358 /* protocol error... send an abort */
1359 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1360 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1361 src, dst, sh, op_err,
1362 mflowtype, mflowid,
1363 vrf_id, net->port);
1364 *abort_no_unlock = 1;
1365 return (-1);
1366 }
1367 /* process according to association state... */
1368 switch (stcb->asoc.state & SCTP_STATE_MASK) {
1369 case SCTP_STATE_COOKIE_WAIT:
1370 /* this is the expected state for this chunk */
1371 /* process the INIT-ACK parameters */
1372 if (stcb->asoc.primary_destination->dest_state &
1373 SCTP_ADDR_UNCONFIRMED) {
1374 /*
1375 * The primary is where we sent the INIT, we can
1376 * always consider it confirmed when the INIT-ACK is
1377 * returned. Do this before we load addresses
1378 * though.
1379 */
1380 stcb->asoc.primary_destination->dest_state &=
1381 ~SCTP_ADDR_UNCONFIRMED;
1382 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1383 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1384 }
1385 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1386 net, abort_no_unlock,
1387 mflowtype, mflowid,
1388 vrf_id) < 0) {
1389 /* error in parsing parameters */
1390 return (-1);
1391 }
1392 /* update our state */
1393 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1394 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1395
1396 /* reset the RTO calc */
1397 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1398 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1399 stcb->asoc.overall_error_count,
1400 0,
1401 SCTP_FROM_SCTP_INPUT,
1402 __LINE__);
1403 }
1404 stcb->asoc.overall_error_count = 0;
1405 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1406 /*
1407 * collapse the init timer back in case of a exponential
1408 * backoff
1409 */
1410 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1411 stcb, net);
1412 /*
1413 * the send at the end of the inbound data processing will
1414 * cause the cookie to be sent
1415 */
1416 break;
1417 case SCTP_STATE_SHUTDOWN_SENT:
1418 /* incorrect state... discard */
1419 break;
1420 case SCTP_STATE_COOKIE_ECHOED:
1421 /* incorrect state... discard */
1422 break;
1423 case SCTP_STATE_OPEN:
1424 /* incorrect state... discard */
1425 break;
1426 case SCTP_STATE_EMPTY:
1427 case SCTP_STATE_INUSE:
1428 default:
1429 /* incorrect state... discard */
1430 return (-1);
1431 break;
1432 }
1433 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1434 return (0);
1435 }
1436
1437 static struct sctp_tcb *
1438 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1439 struct sockaddr *src, struct sockaddr *dst,
1440 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1441 struct sctp_inpcb *inp, struct sctp_nets **netp,
1442 struct sockaddr *init_src, int *notification,
1443 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1444 uint8_t mflowtype, uint32_t mflowid,
1445 uint32_t vrf_id, uint16_t port);
1446
1447
1448 /*
1449 * handle a state cookie for an existing association m: input packet mbuf
1450 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1451 * "split" mbuf and the cookie signature does not exist offset: offset into
1452 * mbuf to the cookie-echo chunk
1453 */
1454 static struct sctp_tcb *
1455 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1456 struct sockaddr *src, struct sockaddr *dst,
1457 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1458 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1459 struct sockaddr *init_src, int *notification,
1460 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1461 uint8_t mflowtype, uint32_t mflowid,
1462 uint32_t vrf_id, uint16_t port)
1463 {
1464 struct sctp_association *asoc;
1465 struct sctp_init_chunk *init_cp, init_buf;
1466 struct sctp_init_ack_chunk *initack_cp, initack_buf;
1467 struct sctp_nets *net;
1468 struct mbuf *op_err;
1469 int init_offset, initack_offset, i;
1470 int retval;
1471 int spec_flag = 0;
1472 uint32_t how_indx;
1473
1474 #if defined(SCTP_DETAILED_STR_STATS)
1475 int j;
1476
1477 #endif
1478
1479 net = *netp;
1480 /* I know that the TCB is non-NULL from the caller */
1481 asoc = &stcb->asoc;
1482 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1483 if (asoc->cookie_how[how_indx] == 0)
1484 break;
1485 }
1486 if (how_indx < sizeof(asoc->cookie_how)) {
1487 asoc->cookie_how[how_indx] = 1;
1488 }
1489 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1490 /* SHUTDOWN came in after sending INIT-ACK */
1491 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1492 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1493 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1494 mflowtype, mflowid, inp->fibnum,
1495 vrf_id, net->port);
1496 if (how_indx < sizeof(asoc->cookie_how))
1497 asoc->cookie_how[how_indx] = 2;
1498 return (NULL);
1499 }
1500 /*
1501 * find and validate the INIT chunk in the cookie (peer's info) the
1502 * INIT should start after the cookie-echo header struct (chunk
1503 * header, state cookie header struct)
1504 */
1505 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1506
1507 init_cp = (struct sctp_init_chunk *)
1508 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1509 (uint8_t *) & init_buf);
1510 if (init_cp == NULL) {
1511 /* could not pull a INIT chunk in cookie */
1512 return (NULL);
1513 }
1514 if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1515 return (NULL);
1516 }
1517 /*
1518 * find and validate the INIT-ACK chunk in the cookie (my info) the
1519 * INIT-ACK follows the INIT chunk
1520 */
1521 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1522 initack_cp = (struct sctp_init_ack_chunk *)
1523 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1524 (uint8_t *) & initack_buf);
1525 if (initack_cp == NULL) {
1526 /* could not pull INIT-ACK chunk in cookie */
1527 return (NULL);
1528 }
1529 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1530 return (NULL);
1531 }
1532 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1533 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1534 /*
1535 * case D in Section 5.2.4 Table 2: MMAA process accordingly
1536 * to get into the OPEN state
1537 */
1538 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1539 /*-
1540 * Opps, this means that we somehow generated two vtag's
1541 * the same. I.e. we did:
1542 * Us Peer
1543 * <---INIT(tag=a)------
1544 * ----INIT-ACK(tag=t)-->
1545 * ----INIT(tag=t)------> *1
1546 * <---INIT-ACK(tag=a)---
1547 * <----CE(tag=t)------------- *2
1548 *
1549 * At point *1 we should be generating a different
1550 * tag t'. Which means we would throw away the CE and send
1551 * ours instead. Basically this is case C (throw away side).
1552 */
1553 if (how_indx < sizeof(asoc->cookie_how))
1554 asoc->cookie_how[how_indx] = 17;
1555 return (NULL);
1556
1557 }
1558 switch (SCTP_GET_STATE(asoc)) {
1559 case SCTP_STATE_COOKIE_WAIT:
1560 case SCTP_STATE_COOKIE_ECHOED:
1561 /*
1562 * INIT was sent but got a COOKIE_ECHO with the
1563 * correct tags... just accept it...but we must
1564 * process the init so that we can make sure we have
1565 * the right seq no's.
1566 */
1567 /* First we must process the INIT !! */
1568 retval = sctp_process_init(init_cp, stcb);
1569 if (retval < 0) {
1570 if (how_indx < sizeof(asoc->cookie_how))
1571 asoc->cookie_how[how_indx] = 3;
1572 return (NULL);
1573 }
1574 /* we have already processed the INIT so no problem */
1575 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1576 stcb, net,
1577 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1578 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1579 stcb, net,
1580 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1581 /* update current state */
1582 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1583 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1584 else
1585 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1586
1587 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1588 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1589 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1590 stcb->sctp_ep, stcb, asoc->primary_destination);
1591 }
1592 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1593 sctp_stop_all_cookie_timers(stcb);
1594 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1595 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1596 (inp->sctp_socket->so_qlimit == 0)
1597 ) {
1598 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1599 struct socket *so;
1600
1601 #endif
1602 /*
1603 * Here is where collision would go if we
1604 * did a connect() and instead got a
1605 * init/init-ack/cookie done before the
1606 * init-ack came back..
1607 */
1608 stcb->sctp_ep->sctp_flags |=
1609 SCTP_PCB_FLAGS_CONNECTED;
1610 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1611 so = SCTP_INP_SO(stcb->sctp_ep);
1612 atomic_add_int(&stcb->asoc.refcnt, 1);
1613 SCTP_TCB_UNLOCK(stcb);
1614 SCTP_SOCKET_LOCK(so, 1);
1615 SCTP_TCB_LOCK(stcb);
1616 atomic_add_int(&stcb->asoc.refcnt, -1);
1617 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1618 SCTP_SOCKET_UNLOCK(so, 1);
1619 return (NULL);
1620 }
1621 #endif
1622 soisconnected(stcb->sctp_socket);
1623 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1624 SCTP_SOCKET_UNLOCK(so, 1);
1625 #endif
1626 }
1627 /* notify upper layer */
1628 *notification = SCTP_NOTIFY_ASSOC_UP;
1629 /*
1630 * since we did not send a HB make sure we don't
1631 * double things
1632 */
1633 net->hb_responded = 1;
1634 net->RTO = sctp_calculate_rto(stcb, asoc, net,
1635 &cookie->time_entered,
1636 sctp_align_unsafe_makecopy,
1637 SCTP_RTT_FROM_NON_DATA);
1638
1639 if (stcb->asoc.sctp_autoclose_ticks &&
1640 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1641 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1642 inp, stcb, NULL);
1643 }
1644 break;
1645 default:
1646 /*
1647 * we're in the OPEN state (or beyond), so peer must
1648 * have simply lost the COOKIE-ACK
1649 */
1650 break;
1651 } /* end switch */
1652 sctp_stop_all_cookie_timers(stcb);
1653 /*
1654 * We ignore the return code here.. not sure if we should
1655 * somehow abort.. but we do have an existing asoc. This
1656 * really should not fail.
1657 */
1658 if (sctp_load_addresses_from_init(stcb, m,
1659 init_offset + sizeof(struct sctp_init_chunk),
1660 initack_offset, src, dst, init_src)) {
1661 if (how_indx < sizeof(asoc->cookie_how))
1662 asoc->cookie_how[how_indx] = 4;
1663 return (NULL);
1664 }
1665 /* respond with a COOKIE-ACK */
1666 sctp_toss_old_cookies(stcb, asoc);
1667 sctp_send_cookie_ack(stcb);
1668 if (how_indx < sizeof(asoc->cookie_how))
1669 asoc->cookie_how[how_indx] = 5;
1670 return (stcb);
1671 }
1672 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1673 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1674 cookie->tie_tag_my_vtag == 0 &&
1675 cookie->tie_tag_peer_vtag == 0) {
1676 /*
1677 * case C in Section 5.2.4 Table 2: XMOO silently discard
1678 */
1679 if (how_indx < sizeof(asoc->cookie_how))
1680 asoc->cookie_how[how_indx] = 6;
1681 return (NULL);
1682 }
1683 /*
1684 * If nat support, and the below and stcb is established, send back
1685 * a ABORT(colliding state) if we are established.
1686 */
1687 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1688 (asoc->peer_supports_nat) &&
1689 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1690 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1691 (asoc->peer_vtag == 0)))) {
1692 /*
1693 * Special case - Peer's support nat. We may have two init's
1694 * that we gave out the same tag on since one was not
1695 * established.. i.e. we get INIT from host-1 behind the nat
1696 * and we respond tag-a, we get a INIT from host-2 behind
1697 * the nat and we get tag-a again. Then we bring up host-1
1698 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1699 * Now we have colliding state. We must send an abort here
1700 * with colliding state indication.
1701 */
1702 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1703 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1704 mflowtype, mflowid, inp->fibnum,
1705 vrf_id, port);
1706 return (NULL);
1707 }
1708 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1709 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1710 (asoc->peer_vtag == 0))) {
1711 /*
1712 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1713 * should be ok, re-accept peer info
1714 */
1715 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1716 /*
1717 * Extension of case C. If we hit this, then the
1718 * random number generator returned the same vtag
1719 * when we first sent our INIT-ACK and when we later
1720 * sent our INIT. The side with the seq numbers that
1721 * are different will be the one that normnally
1722 * would have hit case C. This in effect "extends"
1723 * our vtags in this collision case to be 64 bits.
1724 * The same collision could occur aka you get both
1725 * vtag and seq number the same twice in a row.. but
1726 * is much less likely. If it did happen then we
1727 * would proceed through and bring up the assoc.. we
1728 * may end up with the wrong stream setup however..
1729 * which would be bad.. but there is no way to
1730 * tell.. until we send on a stream that does not
1731 * exist :-)
1732 */
1733 if (how_indx < sizeof(asoc->cookie_how))
1734 asoc->cookie_how[how_indx] = 7;
1735
1736 return (NULL);
1737 }
1738 if (how_indx < sizeof(asoc->cookie_how))
1739 asoc->cookie_how[how_indx] = 8;
1740 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1741 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1742 sctp_stop_all_cookie_timers(stcb);
1743 /*
1744 * since we did not send a HB make sure we don't double
1745 * things
1746 */
1747 net->hb_responded = 1;
1748 if (stcb->asoc.sctp_autoclose_ticks &&
1749 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1750 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1751 NULL);
1752 }
1753 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1754 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1755
1756 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1757 /*
1758 * Ok the peer probably discarded our data (if we
1759 * echoed a cookie+data). So anything on the
1760 * sent_queue should be marked for retransmit, we
1761 * may not get something to kick us so it COULD
1762 * still take a timeout to move these.. but it can't
1763 * hurt to mark them.
1764 */
1765 struct sctp_tmit_chunk *chk;
1766
1767 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1768 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1769 chk->sent = SCTP_DATAGRAM_RESEND;
1770 sctp_flight_size_decrease(chk);
1771 sctp_total_flight_decrease(stcb, chk);
1772 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1773 spec_flag++;
1774 }
1775 }
1776
1777 }
1778 /* process the INIT info (peer's info) */
1779 retval = sctp_process_init(init_cp, stcb);
1780 if (retval < 0) {
1781 if (how_indx < sizeof(asoc->cookie_how))
1782 asoc->cookie_how[how_indx] = 9;
1783 return (NULL);
1784 }
1785 if (sctp_load_addresses_from_init(stcb, m,
1786 init_offset + sizeof(struct sctp_init_chunk),
1787 initack_offset, src, dst, init_src)) {
1788 if (how_indx < sizeof(asoc->cookie_how))
1789 asoc->cookie_how[how_indx] = 10;
1790 return (NULL);
1791 }
1792 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1793 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1794 *notification = SCTP_NOTIFY_ASSOC_UP;
1795
1796 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1797 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1798 (inp->sctp_socket->so_qlimit == 0)) {
1799 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1800 struct socket *so;
1801
1802 #endif
1803 stcb->sctp_ep->sctp_flags |=
1804 SCTP_PCB_FLAGS_CONNECTED;
1805 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1806 so = SCTP_INP_SO(stcb->sctp_ep);
1807 atomic_add_int(&stcb->asoc.refcnt, 1);
1808 SCTP_TCB_UNLOCK(stcb);
1809 SCTP_SOCKET_LOCK(so, 1);
1810 SCTP_TCB_LOCK(stcb);
1811 atomic_add_int(&stcb->asoc.refcnt, -1);
1812 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1813 SCTP_SOCKET_UNLOCK(so, 1);
1814 return (NULL);
1815 }
1816 #endif
1817 soisconnected(stcb->sctp_socket);
1818 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1819 SCTP_SOCKET_UNLOCK(so, 1);
1820 #endif
1821 }
1822 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1823 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1824 else
1825 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1826 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1827 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1828 SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1829 } else {
1830 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1831 }
1832 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1833 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1834 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1835 stcb->sctp_ep, stcb, asoc->primary_destination);
1836 }
1837 sctp_stop_all_cookie_timers(stcb);
1838 sctp_toss_old_cookies(stcb, asoc);
1839 sctp_send_cookie_ack(stcb);
1840 if (spec_flag) {
1841 /*
1842 * only if we have retrans set do we do this. What
1843 * this call does is get only the COOKIE-ACK out and
1844 * then when we return the normal call to
1845 * sctp_chunk_output will get the retrans out behind
1846 * this.
1847 */
1848 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1849 }
1850 if (how_indx < sizeof(asoc->cookie_how))
1851 asoc->cookie_how[how_indx] = 11;
1852
1853 return (stcb);
1854 }
1855 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1856 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1857 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1858 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1859 cookie->tie_tag_peer_vtag != 0) {
1860 struct sctpasochead *head;
1861
1862 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1863 struct socket *so;
1864
1865 #endif
1866
1867 if (asoc->peer_supports_nat) {
1868 /*
1869 * This is a gross gross hack. Just call the
1870 * cookie_new code since we are allowing a duplicate
1871 * association. I hope this works...
1872 */
1873 return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1874 sh, cookie, cookie_len,
1875 inp, netp, init_src, notification,
1876 auth_skipped, auth_offset, auth_len,
1877 mflowtype, mflowid,
1878 vrf_id, port));
1879 }
1880 /*
1881 * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1882 */
1883 /* temp code */
1884 if (how_indx < sizeof(asoc->cookie_how))
1885 asoc->cookie_how[how_indx] = 12;
1886 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1887 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1888 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1889 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1890
1891 /* notify upper layer */
1892 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1893 atomic_add_int(&stcb->asoc.refcnt, 1);
1894 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1895 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1896 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1897 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1898 }
1899 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1900 SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1901 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1902 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1903 }
1904 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1905 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1906 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1907 stcb->sctp_ep, stcb, asoc->primary_destination);
1908
1909 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1910 /* move to OPEN state, if not in SHUTDOWN_SENT */
1911 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1912 }
1913 asoc->pre_open_streams =
1914 ntohs(initack_cp->init.num_outbound_streams);
1915 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1916 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1917 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1918
1919 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1920
1921 asoc->str_reset_seq_in = asoc->init_seq_number;
1922
1923 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1924 if (asoc->mapping_array) {
1925 memset(asoc->mapping_array, 0,
1926 asoc->mapping_array_size);
1927 }
1928 if (asoc->nr_mapping_array) {
1929 memset(asoc->nr_mapping_array, 0,
1930 asoc->mapping_array_size);
1931 }
1932 SCTP_TCB_UNLOCK(stcb);
1933 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1934 so = SCTP_INP_SO(stcb->sctp_ep);
1935 SCTP_SOCKET_LOCK(so, 1);
1936 #endif
1937 SCTP_INP_INFO_WLOCK();
1938 SCTP_INP_WLOCK(stcb->sctp_ep);
1939 SCTP_TCB_LOCK(stcb);
1940 atomic_add_int(&stcb->asoc.refcnt, -1);
1941 /* send up all the data */
1942 SCTP_TCB_SEND_LOCK(stcb);
1943
1944 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1945 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1946 stcb->asoc.strmout[i].chunks_on_queues = 0;
1947 #if defined(SCTP_DETAILED_STR_STATS)
1948 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1949 asoc->strmout[i].abandoned_sent[j] = 0;
1950 asoc->strmout[i].abandoned_unsent[j] = 0;
1951 }
1952 #else
1953 asoc->strmout[i].abandoned_sent[0] = 0;
1954 asoc->strmout[i].abandoned_unsent[0] = 0;
1955 #endif
1956 stcb->asoc.strmout[i].stream_no = i;
1957 stcb->asoc.strmout[i].next_sequence_send = 0;
1958 stcb->asoc.strmout[i].last_msg_incomplete = 0;
1959 }
1960 /* process the INIT-ACK info (my info) */
1961 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1962 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1963
1964 /* pull from vtag hash */
1965 LIST_REMOVE(stcb, sctp_asocs);
1966 /* re-insert to new vtag position */
1967 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1968 SCTP_BASE_INFO(hashasocmark))];
1969 /*
1970 * put it in the bucket in the vtag hash of assoc's for the
1971 * system
1972 */
1973 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1974
1975 SCTP_TCB_SEND_UNLOCK(stcb);
1976 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1977 SCTP_INP_INFO_WUNLOCK();
1978 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1979 SCTP_SOCKET_UNLOCK(so, 1);
1980 #endif
1981 asoc->total_flight = 0;
1982 asoc->total_flight_count = 0;
1983 /* process the INIT info (peer's info) */
1984 retval = sctp_process_init(init_cp, stcb);
1985 if (retval < 0) {
1986 if (how_indx < sizeof(asoc->cookie_how))
1987 asoc->cookie_how[how_indx] = 13;
1988
1989 return (NULL);
1990 }
1991 /*
1992 * since we did not send a HB make sure we don't double
1993 * things
1994 */
1995 net->hb_responded = 1;
1996
1997 if (sctp_load_addresses_from_init(stcb, m,
1998 init_offset + sizeof(struct sctp_init_chunk),
1999 initack_offset, src, dst, init_src)) {
2000 if (how_indx < sizeof(asoc->cookie_how))
2001 asoc->cookie_how[how_indx] = 14;
2002
2003 return (NULL);
2004 }
2005 /* respond with a COOKIE-ACK */
2006 sctp_stop_all_cookie_timers(stcb);
2007 sctp_toss_old_cookies(stcb, asoc);
2008 sctp_send_cookie_ack(stcb);
2009 if (how_indx < sizeof(asoc->cookie_how))
2010 asoc->cookie_how[how_indx] = 15;
2011
2012 return (stcb);
2013 }
2014 if (how_indx < sizeof(asoc->cookie_how))
2015 asoc->cookie_how[how_indx] = 16;
2016 /* all other cases... */
2017 return (NULL);
2018 }
2019
2020
2021 /*
2022 * handle a state cookie for a new association m: input packet mbuf chain--
2023 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2024 * and the cookie signature does not exist offset: offset into mbuf to the
2025 * cookie-echo chunk length: length of the cookie chunk to: where the init
2026 * was from returns a new TCB
2027 */
2028 static struct sctp_tcb *
2029 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2030 struct sockaddr *src, struct sockaddr *dst,
2031 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2032 struct sctp_inpcb *inp, struct sctp_nets **netp,
2033 struct sockaddr *init_src, int *notification,
2034 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2035 uint8_t mflowtype, uint32_t mflowid,
2036 uint32_t vrf_id, uint16_t port)
2037 {
2038 struct sctp_tcb *stcb;
2039 struct sctp_init_chunk *init_cp, init_buf;
2040 struct sctp_init_ack_chunk *initack_cp, initack_buf;
2041 union sctp_sockstore store;
2042 struct sctp_association *asoc;
2043 int init_offset, initack_offset, initack_limit;
2044 int retval;
2045 int error = 0;
2046 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2047
2048 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2049 struct socket *so;
2050
2051 so = SCTP_INP_SO(inp);
2052 #endif
2053
2054 /*
2055 * find and validate the INIT chunk in the cookie (peer's info) the
2056 * INIT should start after the cookie-echo header struct (chunk
2057 * header, state cookie header struct)
2058 */
2059 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2060 init_cp = (struct sctp_init_chunk *)
2061 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2062 (uint8_t *) & init_buf);
2063 if (init_cp == NULL) {
2064 /* could not pull a INIT chunk in cookie */
2065 SCTPDBG(SCTP_DEBUG_INPUT1,
2066 "process_cookie_new: could not pull INIT chunk hdr\n");
2067 return (NULL);
2068 }
2069 if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2070 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2071 return (NULL);
2072 }
2073 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2074 /*
2075 * find and validate the INIT-ACK chunk in the cookie (my info) the
2076 * INIT-ACK follows the INIT chunk
2077 */
2078 initack_cp = (struct sctp_init_ack_chunk *)
2079 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2080 (uint8_t *) & initack_buf);
2081 if (initack_cp == NULL) {
2082 /* could not pull INIT-ACK chunk in cookie */
2083 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2084 return (NULL);
2085 }
2086 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2087 return (NULL);
2088 }
2089 /*
2090 * NOTE: We can't use the INIT_ACK's chk_length to determine the
2091 * "initack_limit" value. This is because the chk_length field
2092 * includes the length of the cookie, but the cookie is omitted when
2093 * the INIT and INIT_ACK are tacked onto the cookie...
2094 */
2095 initack_limit = offset + cookie_len;
2096
2097 /*
2098 * now that we know the INIT/INIT-ACK are in place, create a new TCB
2099 * and popluate
2100 */
2101
2102 /*
2103 * Here we do a trick, we set in NULL for the proc/thread argument.
2104 * We do this since in effect we only use the p argument when the
2105 * socket is unbound and we must do an implicit bind. Since we are
2106 * getting a cookie, we cannot be unbound.
2107 */
2108 stcb = sctp_aloc_assoc(inp, init_src, &error,
2109 ntohl(initack_cp->init.initiate_tag), vrf_id,
2110 ntohs(initack_cp->init.num_outbound_streams),
2111 (struct thread *)NULL
2112 );
2113 if (stcb == NULL) {
2114 struct mbuf *op_err;
2115
2116 /* memory problem? */
2117 SCTPDBG(SCTP_DEBUG_INPUT1,
2118 "process_cookie_new: no room for another TCB!\n");
2119 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2120 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2121 src, dst, sh, op_err,
2122 mflowtype, mflowid,
2123 vrf_id, port);
2124 return (NULL);
2125 }
2126 /* get the correct sctp_nets */
2127 if (netp)
2128 *netp = sctp_findnet(stcb, init_src);
2129
2130 asoc = &stcb->asoc;
2131 /* get scope variables out of cookie */
2132 asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2133 asoc->scope.site_scope = cookie->site_scope;
2134 asoc->scope.local_scope = cookie->local_scope;
2135 asoc->scope.loopback_scope = cookie->loopback_scope;
2136
2137 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2138 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2139 struct mbuf *op_err;
2140
2141 /*
2142 * Houston we have a problem. The EP changed while the
2143 * cookie was in flight. Only recourse is to abort the
2144 * association.
2145 */
2146 atomic_add_int(&stcb->asoc.refcnt, 1);
2147 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2148 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2149 src, dst, sh, op_err,
2150 mflowtype, mflowid,
2151 vrf_id, port);
2152 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2153 SCTP_TCB_UNLOCK(stcb);
2154 SCTP_SOCKET_LOCK(so, 1);
2155 SCTP_TCB_LOCK(stcb);
2156 #endif
2157 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2158 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2159 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2160 SCTP_SOCKET_UNLOCK(so, 1);
2161 #endif
2162 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2163 return (NULL);
2164 }
2165 /* process the INIT-ACK info (my info) */
2166 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2167 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2168 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2169 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2170 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2171 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2172 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2173 asoc->str_reset_seq_in = asoc->init_seq_number;
2174
2175 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2176
2177 /* process the INIT info (peer's info) */
2178 if (netp)
2179 retval = sctp_process_init(init_cp, stcb);
2180 else
2181 retval = 0;
2182 if (retval < 0) {
2183 atomic_add_int(&stcb->asoc.refcnt, 1);
2184 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2185 SCTP_TCB_UNLOCK(stcb);
2186 SCTP_SOCKET_LOCK(so, 1);
2187 SCTP_TCB_LOCK(stcb);
2188 #endif
2189 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2190 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2191 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2192 SCTP_SOCKET_UNLOCK(so, 1);
2193 #endif
2194 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2195 return (NULL);
2196 }
2197 /* load all addresses */
2198 if (sctp_load_addresses_from_init(stcb, m,
2199 init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2200 src, dst, init_src)) {
2201 atomic_add_int(&stcb->asoc.refcnt, 1);
2202 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2203 SCTP_TCB_UNLOCK(stcb);
2204 SCTP_SOCKET_LOCK(so, 1);
2205 SCTP_TCB_LOCK(stcb);
2206 #endif
2207 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2208 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2210 SCTP_SOCKET_UNLOCK(so, 1);
2211 #endif
2212 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2213 return (NULL);
2214 }
2215 /*
2216 * verify any preceding AUTH chunk that was skipped
2217 */
2218 /* pull the local authentication parameters from the cookie/init-ack */
2219 sctp_auth_get_cookie_params(stcb, m,
2220 initack_offset + sizeof(struct sctp_init_ack_chunk),
2221 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2222 if (auth_skipped) {
2223 struct sctp_auth_chunk *auth;
2224
2225 auth = (struct sctp_auth_chunk *)
2226 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2227 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2228 /* auth HMAC failed, dump the assoc and packet */
2229 SCTPDBG(SCTP_DEBUG_AUTH1,
2230 "COOKIE-ECHO: AUTH failed\n");
2231 atomic_add_int(&stcb->asoc.refcnt, 1);
2232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2233 SCTP_TCB_UNLOCK(stcb);
2234 SCTP_SOCKET_LOCK(so, 1);
2235 SCTP_TCB_LOCK(stcb);
2236 #endif
2237 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2238 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2239 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2240 SCTP_SOCKET_UNLOCK(so, 1);
2241 #endif
2242 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2243 return (NULL);
2244 } else {
2245 /* remaining chunks checked... good to go */
2246 stcb->asoc.authenticated = 1;
2247 }
2248 }
2249 /* update current state */
2250 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2251 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2252 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2253 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2254 stcb->sctp_ep, stcb, asoc->primary_destination);
2255 }
2256 sctp_stop_all_cookie_timers(stcb);
2257 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2258 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2259
2260 /*
2261 * if we're doing ASCONFs, check to see if we have any new local
2262 * addresses that need to get added to the peer (eg. addresses
2263 * changed while cookie echo in flight). This needs to be done
2264 * after we go to the OPEN state to do the correct asconf
2265 * processing. else, make sure we have the correct addresses in our
2266 * lists
2267 */
2268
2269 /* warning, we re-use sin, sin6, sa_store here! */
2270 /* pull in local_address (our "from" address) */
2271 switch (cookie->laddr_type) {
2272 #ifdef INET
2273 case SCTP_IPV4_ADDRESS:
2274 /* source addr is IPv4 */
2275 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2276 store.sin.sin_family = AF_INET;
2277 store.sin.sin_len = sizeof(struct sockaddr_in);
2278 store.sin.sin_addr.s_addr = cookie->laddress[0];
2279 break;
2280 #endif
2281 #ifdef INET6
2282 case SCTP_IPV6_ADDRESS:
2283 /* source addr is IPv6 */
2284 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2285 store.sin6.sin6_family = AF_INET6;
2286 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2287 store.sin6.sin6_scope_id = cookie->scope_id;
2288 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2289 break;
2290 #endif
2291 default:
2292 atomic_add_int(&stcb->asoc.refcnt, 1);
2293 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2294 SCTP_TCB_UNLOCK(stcb);
2295 SCTP_SOCKET_LOCK(so, 1);
2296 SCTP_TCB_LOCK(stcb);
2297 #endif
2298 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2299 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2300 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2301 SCTP_SOCKET_UNLOCK(so, 1);
2302 #endif
2303 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2304 return (NULL);
2305 }
2306
2307 /* set up to notify upper layer */
2308 *notification = SCTP_NOTIFY_ASSOC_UP;
2309 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2310 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2311 (inp->sctp_socket->so_qlimit == 0)) {
2312 /*
2313 * This is an endpoint that called connect() how it got a
2314 * cookie that is NEW is a bit of a mystery. It must be that
2315 * the INIT was sent, but before it got there.. a complete
2316 * INIT/INIT-ACK/COOKIE arrived. But of course then it
2317 * should have went to the other code.. not here.. oh well..
2318 * a bit of protection is worth having..
2319 */
2320 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2321 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2322 atomic_add_int(&stcb->asoc.refcnt, 1);
2323 SCTP_TCB_UNLOCK(stcb);
2324 SCTP_SOCKET_LOCK(so, 1);
2325 SCTP_TCB_LOCK(stcb);
2326 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2327 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2328 SCTP_SOCKET_UNLOCK(so, 1);
2329 return (NULL);
2330 }
2331 #endif
2332 soisconnected(stcb->sctp_socket);
2333 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2334 SCTP_SOCKET_UNLOCK(so, 1);
2335 #endif
2336 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2337 (inp->sctp_socket->so_qlimit)) {
2338 /*
2339 * We don't want to do anything with this one. Since it is
2340 * the listening guy. The timer will get started for
2341 * accepted connections in the caller.
2342 */
2343 ;
2344 }
2345 /* since we did not send a HB make sure we don't double things */
2346 if ((netp) && (*netp))
2347 (*netp)->hb_responded = 1;
2348
2349 if (stcb->asoc.sctp_autoclose_ticks &&
2350 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2351 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2352 }
2353 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2354 if ((netp != NULL) && (*netp != NULL)) {
2355 /* calculate the RTT and set the encaps port */
2356 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2357 &cookie->time_entered, sctp_align_unsafe_makecopy,
2358 SCTP_RTT_FROM_NON_DATA);
2359 #if defined(INET) || defined(INET6)
2360 if (((*netp)->port == 0) && (port != 0)) {
2361 sctp_pathmtu_adjustment(stcb, (*netp)->mtu - sizeof(struct udphdr));
2362 }
2363 (*netp)->port = port;
2364 #endif
2365 }
2366 /* respond with a COOKIE-ACK */
2367 sctp_send_cookie_ack(stcb);
2368
2369 /*
2370 * check the address lists for any ASCONFs that need to be sent
2371 * AFTER the cookie-ack is sent
2372 */
2373 sctp_check_address_list(stcb, m,
2374 initack_offset + sizeof(struct sctp_init_ack_chunk),
2375 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2376 &store.sa, cookie->local_scope, cookie->site_scope,
2377 cookie->ipv4_scope, cookie->loopback_scope);
2378
2379
2380 return (stcb);
2381 }
2382
2383 /*
2384 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2385 * we NEED to make sure we are not already using the vtag. If so we
2386 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2387 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2388 SCTP_BASE_INFO(hashasocmark))];
2389 LIST_FOREACH(stcb, head, sctp_asocs) {
2390 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) {
2391 -- SEND ABORT - TRY AGAIN --
2392 }
2393 }
2394 */
2395
2396 /*
2397 * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2398 * existing (non-NULL) TCB
2399 */
2400 static struct mbuf *
2401 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2402 struct sockaddr *src, struct sockaddr *dst,
2403 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2404 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2405 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2406 struct sctp_tcb **locked_tcb,
2407 uint8_t mflowtype, uint32_t mflowid,
2408 uint32_t vrf_id, uint16_t port)
2409 {
2410 struct sctp_state_cookie *cookie;
2411 struct sctp_tcb *l_stcb = *stcb;
2412 struct sctp_inpcb *l_inp;
2413 struct sockaddr *to;
2414 struct sctp_pcb *ep;
2415 struct mbuf *m_sig;
2416 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2417 uint8_t *sig;
2418 uint8_t cookie_ok = 0;
2419 unsigned int sig_offset, cookie_offset;
2420 unsigned int cookie_len;
2421 struct timeval now;
2422 struct timeval time_expires;
2423 int notification = 0;
2424 struct sctp_nets *netl;
2425 int had_a_existing_tcb = 0;
2426 int send_int_conf = 0;
2427
2428 #ifdef INET
2429 struct sockaddr_in sin;
2430
2431 #endif
2432 #ifdef INET6
2433 struct sockaddr_in6 sin6;
2434
2435 #endif
2436
2437 SCTPDBG(SCTP_DEBUG_INPUT2,
2438 "sctp_handle_cookie: handling COOKIE-ECHO\n");
2439
2440 if (inp_p == NULL) {
2441 return (NULL);
2442 }
2443 cookie = &cp->cookie;
2444 cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2445 cookie_len = ntohs(cp->ch.chunk_length);
2446
2447 if ((cookie->peerport != sh->src_port) ||
2448 (cookie->myport != sh->dest_port) ||
2449 (cookie->my_vtag != sh->v_tag)) {
2450 /*
2451 * invalid ports or bad tag. Note that we always leave the
2452 * v_tag in the header in network order and when we stored
2453 * it in the my_vtag slot we also left it in network order.
2454 * This maintains the match even though it may be in the
2455 * opposite byte order of the machine :->
2456 */
2457 return (NULL);
2458 }
2459 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2460 sizeof(struct sctp_init_chunk) +
2461 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2462 /* cookie too small */
2463 return (NULL);
2464 }
2465 /*
2466 * split off the signature into its own mbuf (since it should not be
2467 * calculated in the sctp_hmac_m() call).
2468 */
2469 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2470 m_sig = m_split(m, sig_offset, M_NOWAIT);
2471 if (m_sig == NULL) {
2472 /* out of memory or ?? */
2473 return (NULL);
2474 }
2475 #ifdef SCTP_MBUF_LOGGING
2476 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2477 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2478 }
2479 #endif
2480
2481 /*
2482 * compute the signature/digest for the cookie
2483 */
2484 ep = &(*inp_p)->sctp_ep;
2485 l_inp = *inp_p;
2486 if (l_stcb) {
2487 SCTP_TCB_UNLOCK(l_stcb);
2488 }
2489 SCTP_INP_RLOCK(l_inp);
2490 if (l_stcb) {
2491 SCTP_TCB_LOCK(l_stcb);
2492 }
2493 /* which cookie is it? */
2494 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2495 (ep->current_secret_number != ep->last_secret_number)) {
2496 /* it's the old cookie */
2497 (void)sctp_hmac_m(SCTP_HMAC,
2498 (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2499 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2500 } else {
2501 /* it's the current cookie */
2502 (void)sctp_hmac_m(SCTP_HMAC,
2503 (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2504 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2505 }
2506 /* get the signature */
2507 SCTP_INP_RUNLOCK(l_inp);
2508 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2509 if (sig == NULL) {
2510 /* couldn't find signature */
2511 sctp_m_freem(m_sig);
2512 return (NULL);
2513 }
2514 /* compare the received digest with the computed digest */
2515 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2516 /* try the old cookie? */
2517 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2518 (ep->current_secret_number != ep->last_secret_number)) {
2519 /* compute digest with old */
2520 (void)sctp_hmac_m(SCTP_HMAC,
2521 (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2522 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2523 /* compare */
2524 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2525 cookie_ok = 1;
2526 }
2527 } else {
2528 cookie_ok = 1;
2529 }
2530
2531 /*
2532 * Now before we continue we must reconstruct our mbuf so that
2533 * normal processing of any other chunks will work.
2534 */
2535 {
2536 struct mbuf *m_at;
2537
2538 m_at = m;
2539 while (SCTP_BUF_NEXT(m_at) != NULL) {
2540 m_at = SCTP_BUF_NEXT(m_at);
2541 }
2542 SCTP_BUF_NEXT(m_at) = m_sig;
2543 }
2544
2545 if (cookie_ok == 0) {
2546 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2547 SCTPDBG(SCTP_DEBUG_INPUT2,
2548 "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2549 (uint32_t) offset, cookie_offset, sig_offset);
2550 return (NULL);
2551 }
2552 /*
2553 * check the cookie timestamps to be sure it's not stale
2554 */
2555 (void)SCTP_GETTIME_TIMEVAL(&now);
2556 /* Expire time is in Ticks, so we convert to seconds */
2557 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2558 time_expires.tv_usec = cookie->time_entered.tv_usec;
2559 /*
2560 * TODO sctp_constants.h needs alternative time macros when _KERNEL
2561 * is undefined.
2562 */
2563 if (timevalcmp(&now, &time_expires, >)) {
2564 /* cookie is stale! */
2565 struct mbuf *op_err;
2566 struct sctp_error_stale_cookie *cause;
2567 uint32_t tim;
2568
2569 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2570 0, M_NOWAIT, 1, MT_DATA);
2571 if (op_err == NULL) {
2572 /* FOOBAR */
2573 return (NULL);
2574 }
2575 /* Set the len */
2576 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2577 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2578 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2579 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2580 (sizeof(uint32_t))));
2581 /* seconds to usec */
2582 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2583 /* add in usec */
2584 if (tim == 0)
2585 tim = now.tv_usec - cookie->time_entered.tv_usec;
2586 cause->stale_time = htonl(tim);
2587 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2588 mflowtype, mflowid, l_inp->fibnum,
2589 vrf_id, port);
2590 return (NULL);
2591 }
2592 /*
2593 * Now we must see with the lookup address if we have an existing
2594 * asoc. This will only happen if we were in the COOKIE-WAIT state
2595 * and a INIT collided with us and somewhere the peer sent the
2596 * cookie on another address besides the single address our assoc
2597 * had for him. In this case we will have one of the tie-tags set at
2598 * least AND the address field in the cookie can be used to look it
2599 * up.
2600 */
2601 to = NULL;
2602 switch (cookie->addr_type) {
2603 #ifdef INET6
2604 case SCTP_IPV6_ADDRESS:
2605 memset(&sin6, 0, sizeof(sin6));
2606 sin6.sin6_family = AF_INET6;
2607 sin6.sin6_len = sizeof(sin6);
2608 sin6.sin6_port = sh->src_port;
2609 sin6.sin6_scope_id = cookie->scope_id;
2610 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2611 sizeof(sin6.sin6_addr.s6_addr));
2612 to = (struct sockaddr *)&sin6;
2613 break;
2614 #endif
2615 #ifdef INET
2616 case SCTP_IPV4_ADDRESS:
2617 memset(&sin, 0, sizeof(sin));
2618 sin.sin_family = AF_INET;
2619 sin.sin_len = sizeof(sin);
2620 sin.sin_port = sh->src_port;
2621 sin.sin_addr.s_addr = cookie->address[0];
2622 to = (struct sockaddr *)&sin;
2623 break;
2624 #endif
2625 default:
2626 /* This should not happen */
2627 return (NULL);
2628 }
2629 if (*stcb == NULL) {
2630 /* Yep, lets check */
2631 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2632 if (*stcb == NULL) {
2633 /*
2634 * We should have only got back the same inp. If we
2635 * got back a different ep we have a problem. The
2636 * original findep got back l_inp and now
2637 */
2638 if (l_inp != *inp_p) {
2639 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2640 }
2641 } else {
2642 if (*locked_tcb == NULL) {
2643 /*
2644 * In this case we found the assoc only
2645 * after we locked the create lock. This
2646 * means we are in a colliding case and we
2647 * must make sure that we unlock the tcb if
2648 * its one of the cases where we throw away
2649 * the incoming packets.
2650 */
2651 *locked_tcb = *stcb;
2652
2653 /*
2654 * We must also increment the inp ref count
2655 * since the ref_count flags was set when we
2656 * did not find the TCB, now we found it
2657 * which reduces the refcount.. we must
2658 * raise it back out to balance it all :-)
2659 */
2660 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2661 if ((*stcb)->sctp_ep != l_inp) {
2662 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2663 (void *)(*stcb)->sctp_ep, (void *)l_inp);
2664 }
2665 }
2666 }
2667 }
2668 cookie_len -= SCTP_SIGNATURE_SIZE;
2669 if (*stcb == NULL) {
2670 /* this is the "normal" case... get a new TCB */
2671 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2672 cookie, cookie_len, *inp_p,
2673 netp, to, ¬ification,
2674 auth_skipped, auth_offset, auth_len,
2675 mflowtype, mflowid,
2676 vrf_id, port);
2677 } else {
2678 /* this is abnormal... cookie-echo on existing TCB */
2679 had_a_existing_tcb = 1;
2680 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2681 src, dst, sh,
2682 cookie, cookie_len, *inp_p, *stcb, netp, to,
2683 ¬ification, auth_skipped, auth_offset, auth_len,
2684 mflowtype, mflowid,
2685 vrf_id, port);
2686 }
2687
2688 if (*stcb == NULL) {
2689 /* still no TCB... must be bad cookie-echo */
2690 return (NULL);
2691 }
2692 if (*netp != NULL) {
2693 (*netp)->flowtype = mflowtype;
2694 (*netp)->flowid = mflowid;
2695 }
2696 /*
2697 * Ok, we built an association so confirm the address we sent the
2698 * INIT-ACK to.
2699 */
2700 netl = sctp_findnet(*stcb, to);
2701 /*
2702 * This code should in theory NOT run but
2703 */
2704 if (netl == NULL) {
2705 /* TSNH! Huh, why do I need to add this address here? */
2706 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2707 return (NULL);
2708 }
2709 netl = sctp_findnet(*stcb, to);
2710 }
2711 if (netl) {
2712 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2713 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2714 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2715 netl);
2716 send_int_conf = 1;
2717 }
2718 }
2719 sctp_start_net_timers(*stcb);
2720 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2721 if (!had_a_existing_tcb ||
2722 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2723 /*
2724 * If we have a NEW cookie or the connect never
2725 * reached the connected state during collision we
2726 * must do the TCP accept thing.
2727 */
2728 struct socket *so, *oso;
2729 struct sctp_inpcb *inp;
2730
2731 if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2732 /*
2733 * For a restart we will keep the same
2734 * socket, no need to do anything. I THINK!!
2735 */
2736 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2737 if (send_int_conf) {
2738 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2739 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2740 }
2741 return (m);
2742 }
2743 oso = (*inp_p)->sctp_socket;
2744 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2745 SCTP_TCB_UNLOCK((*stcb));
2746 CURVNET_SET(oso->so_vnet);
2747 so = sonewconn(oso, 0
2748 );
2749 CURVNET_RESTORE();
2750 SCTP_TCB_LOCK((*stcb));
2751 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2752
2753 if (so == NULL) {
2754 struct mbuf *op_err;
2755
2756 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2757 struct socket *pcb_so;
2758
2759 #endif
2760 /* Too many sockets */
2761 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2762 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2763 sctp_abort_association(*inp_p, NULL, m, iphlen,
2764 src, dst, sh, op_err,
2765 mflowtype, mflowid,
2766 vrf_id, port);
2767 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2768 pcb_so = SCTP_INP_SO(*inp_p);
2769 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2770 SCTP_TCB_UNLOCK((*stcb));
2771 SCTP_SOCKET_LOCK(pcb_so, 1);
2772 SCTP_TCB_LOCK((*stcb));
2773 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2774 #endif
2775 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2776 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2777 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2778 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2779 #endif
2780 return (NULL);
2781 }
2782 inp = (struct sctp_inpcb *)so->so_pcb;
2783 SCTP_INP_INCR_REF(inp);
2784 /*
2785 * We add the unbound flag here so that if we get an
2786 * soabort() before we get the move_pcb done, we
2787 * will properly cleanup.
2788 */
2789 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2790 SCTP_PCB_FLAGS_CONNECTED |
2791 SCTP_PCB_FLAGS_IN_TCPPOOL |
2792 SCTP_PCB_FLAGS_UNBOUND |
2793 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2794 SCTP_PCB_FLAGS_DONT_WAKE);
2795 inp->sctp_features = (*inp_p)->sctp_features;
2796 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2797 inp->sctp_socket = so;
2798 inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2799 inp->max_cwnd = (*inp_p)->max_cwnd;
2800 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2801 inp->ecn_supported = (*inp_p)->ecn_supported;
2802 inp->prsctp_supported = (*inp_p)->prsctp_supported;
2803 inp->auth_supported = (*inp_p)->auth_supported;
2804 inp->asconf_supported = (*inp_p)->asconf_supported;
2805 inp->reconfig_supported = (*inp_p)->reconfig_supported;
2806 inp->nrsack_supported = (*inp_p)->nrsack_supported;
2807 inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2808 inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2809 inp->sctp_context = (*inp_p)->sctp_context;
2810 inp->local_strreset_support = (*inp_p)->local_strreset_support;
2811 inp->fibnum = (*inp_p)->fibnum;
2812 inp->inp_starting_point_for_iterator = NULL;
2813 /*
2814 * copy in the authentication parameters from the
2815 * original endpoint
2816 */
2817 if (inp->sctp_ep.local_hmacs)
2818 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2819 inp->sctp_ep.local_hmacs =
2820 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2821 if (inp->sctp_ep.local_auth_chunks)
2822 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2823 inp->sctp_ep.local_auth_chunks =
2824 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2825
2826 /*
2827 * Now we must move it from one hash table to
2828 * another and get the tcb in the right place.
2829 */
2830
2831 /*
2832 * This is where the one-2-one socket is put into
2833 * the accept state waiting for the accept!
2834 */
2835 if (*stcb) {
2836 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2837 }
2838 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2839
2840 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2841 SCTP_TCB_UNLOCK((*stcb));
2842
2843 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2844 0);
2845 SCTP_TCB_LOCK((*stcb));
2846 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2847
2848
2849 /*
2850 * now we must check to see if we were aborted while
2851 * the move was going on and the lock/unlock
2852 * happened.
2853 */
2854 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2855 /*
2856 * yep it was, we leave the assoc attached
2857 * to the socket since the sctp_inpcb_free()
2858 * call will send an abort for us.
2859 */
2860 SCTP_INP_DECR_REF(inp);
2861 return (NULL);
2862 }
2863 SCTP_INP_DECR_REF(inp);
2864 /* Switch over to the new guy */
2865 *inp_p = inp;
2866 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2867 if (send_int_conf) {
2868 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2869 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2870 }
2871 /*
2872 * Pull it from the incomplete queue and wake the
2873 * guy
2874 */
2875 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2876 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2877 SCTP_TCB_UNLOCK((*stcb));
2878 SCTP_SOCKET_LOCK(so, 1);
2879 #endif
2880 soisconnected(so);
2881 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2882 SCTP_TCB_LOCK((*stcb));
2883 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2884 SCTP_SOCKET_UNLOCK(so, 1);
2885 #endif
2886 return (m);
2887 }
2888 }
2889 if (notification) {
2890 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2891 }
2892 if (send_int_conf) {
2893 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2894 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2895 }
2896 return (m);
2897 }
2898
2899 static void
2900 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2901 struct sctp_tcb *stcb, struct sctp_nets *net)
2902 {
2903 /* cp must not be used, others call this without a c-ack :-) */
2904 struct sctp_association *asoc;
2905
2906 SCTPDBG(SCTP_DEBUG_INPUT2,
2907 "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2908 if ((stcb == NULL) || (net == NULL)) {
2909 return;
2910 }
2911 asoc = &stcb->asoc;
2912
2913 sctp_stop_all_cookie_timers(stcb);
2914 /* process according to association state */
2915 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2916 /* state change only needed when I am in right state */
2917 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2918 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2919 sctp_start_net_timers(stcb);
2920 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2921 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2922 stcb->sctp_ep, stcb, asoc->primary_destination);
2923
2924 }
2925 /* update RTO */
2926 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2927 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2928 if (asoc->overall_error_count == 0) {
2929 net->RTO = sctp_calculate_rto(stcb, asoc, net,
2930 &asoc->time_entered, sctp_align_safe_nocopy,
2931 SCTP_RTT_FROM_NON_DATA);
2932 }
2933 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2934 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2935 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2936 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2937 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2938 struct socket *so;
2939
2940 #endif
2941 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2942 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2943 so = SCTP_INP_SO(stcb->sctp_ep);
2944 atomic_add_int(&stcb->asoc.refcnt, 1);
2945 SCTP_TCB_UNLOCK(stcb);
2946 SCTP_SOCKET_LOCK(so, 1);
2947 SCTP_TCB_LOCK(stcb);
2948 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2949 #endif
2950 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2951 soisconnected(stcb->sctp_socket);
2952 }
2953 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2954 SCTP_SOCKET_UNLOCK(so, 1);
2955 #endif
2956 }
2957 /*
2958 * since we did not send a HB make sure we don't double
2959 * things
2960 */
2961 net->hb_responded = 1;
2962
2963 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2964 /*
2965 * We don't need to do the asconf thing, nor hb or
2966 * autoclose if the socket is closed.
2967 */
2968 goto closed_socket;
2969 }
2970 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2971 stcb, net);
2972
2973
2974 if (stcb->asoc.sctp_autoclose_ticks &&
2975 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2976 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2977 stcb->sctp_ep, stcb, NULL);
2978 }
2979 /*
2980 * send ASCONF if parameters are pending and ASCONFs are
2981 * allowed (eg. addresses changed when init/cookie echo were
2982 * in flight)
2983 */
2984 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2985 (stcb->asoc.asconf_supported == 1) &&
2986 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2987 #ifdef SCTP_TIMER_BASED_ASCONF
2988 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2989 stcb->sctp_ep, stcb,
2990 stcb->asoc.primary_destination);
2991 #else
2992 sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2993 SCTP_ADDR_NOT_LOCKED);
2994 #endif
2995 }
2996 }
2997 closed_socket:
2998 /* Toss the cookie if I can */
2999 sctp_toss_old_cookies(stcb, asoc);
3000 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3001 /* Restart the timer if we have pending data */
3002 struct sctp_tmit_chunk *chk;
3003
3004 chk = TAILQ_FIRST(&asoc->sent_queue);
3005 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3006 }
3007 }
3008
3009 static void
3010 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3011 struct sctp_tcb *stcb)
3012 {
3013 struct sctp_nets *net;
3014 struct sctp_tmit_chunk *lchk;
3015 struct sctp_ecne_chunk bkup;
3016 uint8_t override_bit;
3017 uint32_t tsn, window_data_tsn;
3018 int len;
3019 unsigned int pkt_cnt;
3020
3021 len = ntohs(cp->ch.chunk_length);
3022 if ((len != sizeof(struct sctp_ecne_chunk)) &&
3023 (len != sizeof(struct old_sctp_ecne_chunk))) {
3024 return;
3025 }
3026 if (len == sizeof(struct old_sctp_ecne_chunk)) {
3027 /* Its the old format */
3028 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3029 bkup.num_pkts_since_cwr = htonl(1);
3030 cp = &bkup;
3031 }
3032 SCTP_STAT_INCR(sctps_recvecne);
3033 tsn = ntohl(cp->tsn);
3034 pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3035 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3036 if (lchk == NULL) {
3037 window_data_tsn = stcb->asoc.sending_seq - 1;
3038 } else {
3039 window_data_tsn = lchk->rec.data.TSN_seq;
3040 }
3041
3042 /* Find where it was sent to if possible. */
3043 net = NULL;
3044 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3045 if (lchk->rec.data.TSN_seq == tsn) {
3046 net = lchk->whoTo;
3047 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3048 break;
3049 }
3050 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3051 break;
3052 }
3053 }
3054 if (net == NULL) {
3055 /*
3056 * What to do. A previous send of a CWR was possibly lost.
3057 * See how old it is, we may have it marked on the actual
3058 * net.
3059 */
3060 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3061 if (tsn == net->last_cwr_tsn) {
3062 /* Found him, send it off */
3063 break;
3064 }
3065 }
3066 if (net == NULL) {
3067 /*
3068 * If we reach here, we need to send a special CWR
3069 * that says hey, we did this a long time ago and
3070 * you lost the response.
3071 */
3072 net = TAILQ_FIRST(&stcb->asoc.nets);
3073 if (net == NULL) {
3074 /* TSNH */
3075 return;
3076 }
3077 override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3078 } else {
3079 override_bit = 0;
3080 }
3081 } else {
3082 override_bit = 0;
3083 }
3084 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3085 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3086 /*
3087 * JRS - Use the congestion control given in the pluggable
3088 * CC module
3089 */
3090 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3091 /*
3092 * We reduce once every RTT. So we will only lower cwnd at
3093 * the next sending seq i.e. the window_data_tsn
3094 */
3095 net->cwr_window_tsn = window_data_tsn;
3096 net->ecn_ce_pkt_cnt += pkt_cnt;
3097 net->lost_cnt = pkt_cnt;
3098 net->last_cwr_tsn = tsn;
3099 } else {
3100 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3101 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3102 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3103 /*
3104 * Another loss in the same window update how many
3105 * marks/packets lost we have had.
3106 */
3107 int cnt = 1;
3108
3109 if (pkt_cnt > net->lost_cnt) {
3110 /* Should be the case */
3111 cnt = (pkt_cnt - net->lost_cnt);
3112 net->ecn_ce_pkt_cnt += cnt;
3113 }
3114 net->lost_cnt = pkt_cnt;
3115 net->last_cwr_tsn = tsn;
3116 /*
3117 * Most CC functions will ignore this call, since we
3118 * are in-window yet of the initial CE the peer saw.
3119 */
3120 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3121 }
3122 }
3123 /*
3124 * We always send a CWR this way if our previous one was lost our
3125 * peer will get an update, or if it is not time again to reduce we
3126 * still get the cwr to the peer. Note we set the override when we
3127 * could not find the TSN on the chunk or the destination network.
3128 */
3129 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3130 }
3131
3132 static void
3133 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3134 {
3135 /*
3136 * Here we get a CWR from the peer. We must look in the outqueue and
3137 * make sure that we have a covered ECNE in the control chunk part.
3138 * If so remove it.
3139 */
3140 struct sctp_tmit_chunk *chk;
3141 struct sctp_ecne_chunk *ecne;
3142 int override;
3143 uint32_t cwr_tsn;
3144
3145 cwr_tsn = ntohl(cp->tsn);
3146 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3147 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3148 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3149 continue;
3150 }
3151 if ((override == 0) && (chk->whoTo != net)) {
3152 /* Must be from the right src unless override is set */
3153 continue;
3154 }
3155 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3156 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3157 /* this covers this ECNE, we can remove it */
3158 stcb->asoc.ecn_echo_cnt_onq--;
3159 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3160 sctp_next);
3161 sctp_m_freem(chk->data);
3162 chk->data = NULL;
3163 stcb->asoc.ctrl_queue_cnt--;
3164 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3165 if (override == 0) {
3166 break;
3167 }
3168 }
3169 }
3170 }
3171
3172 static void
3173 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3174 struct sctp_tcb *stcb, struct sctp_nets *net)
3175 {
3176 struct sctp_association *asoc;
3177
3178 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3179 struct socket *so;
3180
3181 #endif
3182
3183 SCTPDBG(SCTP_DEBUG_INPUT2,
3184 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3185 if (stcb == NULL)
3186 return;
3187
3188 asoc = &stcb->asoc;
3189 /* process according to association state */
3190 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3191 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3192 SCTPDBG(SCTP_DEBUG_INPUT2,
3193 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3194 SCTP_TCB_UNLOCK(stcb);
3195 return;
3196 }
3197 /* notify upper layer protocol */
3198 if (stcb->sctp_socket) {
3199 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3200 }
3201 #ifdef INVARIANTS
3202 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3203 !TAILQ_EMPTY(&asoc->sent_queue) ||
3204 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3205 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3206 }
3207 #endif
3208 /* stop the timer */
3209 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3210 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3211 SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3212 /* free the TCB */
3213 SCTPDBG(SCTP_DEBUG_INPUT2,
3214 "sctp_handle_shutdown_complete: calls free-asoc\n");
3215 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3216 so = SCTP_INP_SO(stcb->sctp_ep);
3217 atomic_add_int(&stcb->asoc.refcnt, 1);
3218 SCTP_TCB_UNLOCK(stcb);
3219 SCTP_SOCKET_LOCK(so, 1);
3220 SCTP_TCB_LOCK(stcb);
3221 atomic_subtract_int(&stcb->asoc.refcnt, 1);
3222 #endif
3223 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3224 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3225 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3226 SCTP_SOCKET_UNLOCK(so, 1);
3227 #endif
3228 return;
3229 }
3230
3231 static int
3232 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3233 struct sctp_nets *net, uint8_t flg)
3234 {
3235 switch (desc->chunk_type) {
3236 case SCTP_DATA:
3237 /* find the tsn to resend (possibly */
3238 {
3239 uint32_t tsn;
3240 struct sctp_tmit_chunk *tp1;
3241
3242 tsn = ntohl(desc->tsn_ifany);
3243 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3244 if (tp1->rec.data.TSN_seq == tsn) {
3245 /* found it */
3246 break;
3247 }
3248 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3249 /* not found */
3250 tp1 = NULL;
3251 break;
3252 }
3253 }
3254 if (tp1 == NULL) {
3255 /*
3256 * Do it the other way , aka without paying
3257 * attention to queue seq order.
3258 */
3259 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3260 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3261 if (tp1->rec.data.TSN_seq == tsn) {
3262 /* found it */
3263 break;
3264 }
3265 }
3266 }
3267 if (tp1 == NULL) {
3268 SCTP_STAT_INCR(sctps_pdrptsnnf);
3269 }
3270 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3271 uint8_t *ddp;
3272
3273 if (((flg & SCTP_BADCRC) == 0) &&
3274 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3275 return (0);
3276 }
3277 if ((stcb->asoc.peers_rwnd == 0) &&
3278 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3279 SCTP_STAT_INCR(sctps_pdrpdiwnp);
3280 return (0);
3281 }
3282 if (stcb->asoc.peers_rwnd == 0 &&
3283 (flg & SCTP_FROM_MIDDLE_BOX)) {
3284 SCTP_STAT_INCR(sctps_pdrpdizrw);
3285 return (0);
3286 }
3287 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3288 sizeof(struct sctp_data_chunk));
3289 {
3290 unsigned int iii;
3291
3292 for (iii = 0; iii < sizeof(desc->data_bytes);
3293 iii++) {
3294 if (ddp[iii] != desc->data_bytes[iii]) {
3295 SCTP_STAT_INCR(sctps_pdrpbadd);
3296 return (-1);
3297 }
3298 }
3299 }
3300
3301 if (tp1->do_rtt) {
3302 /*
3303 * this guy had a RTO calculation
3304 * pending on it, cancel it
3305 */
3306 if (tp1->whoTo->rto_needed == 0) {
3307 tp1->whoTo->rto_needed = 1;
3308 }
3309 tp1->do_rtt = 0;
3310 }
3311 SCTP_STAT_INCR(sctps_pdrpmark);
3312 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3313 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3314 /*
3315 * mark it as if we were doing a FR, since
3316 * we will be getting gap ack reports behind
3317 * the info from the router.
3318 */
3319 tp1->rec.data.doing_fast_retransmit = 1;
3320 /*
3321 * mark the tsn with what sequences can
3322 * cause a new FR.
3323 */
3324 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3325 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3326 } else {
3327 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3328 }
3329
3330 /* restart the timer */
3331 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3332 stcb, tp1->whoTo,
3333 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3334 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3335 stcb, tp1->whoTo);
3336
3337 /* fix counts and things */
3338 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3339 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3340 tp1->whoTo->flight_size,
3341 tp1->book_size,
3342 (uintptr_t) stcb,
3343 tp1->rec.data.TSN_seq);
3344 }
3345 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3346 sctp_flight_size_decrease(tp1);
3347 sctp_total_flight_decrease(stcb, tp1);
3348 }
3349 tp1->sent = SCTP_DATAGRAM_RESEND;
3350 } {
3351 /* audit code */
3352 unsigned int audit;
3353
3354 audit = 0;
3355 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3356 if (tp1->sent == SCTP_DATAGRAM_RESEND)
3357 audit++;
3358 }
3359 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3360 sctp_next) {
3361 if (tp1->sent == SCTP_DATAGRAM_RESEND)
3362 audit++;
3363 }
3364 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3365 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3366 audit, stcb->asoc.sent_queue_retran_cnt);
3367 #ifndef SCTP_AUDITING_ENABLED
3368 stcb->asoc.sent_queue_retran_cnt = audit;
3369 #endif
3370 }
3371 }
3372 }
3373 break;
3374 case SCTP_ASCONF:
3375 {
3376 struct sctp_tmit_chunk *asconf;
3377
3378 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3379 sctp_next) {
3380 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3381 break;
3382 }
3383 }
3384 if (asconf) {
3385 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3386 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3387 asconf->sent = SCTP_DATAGRAM_RESEND;
3388 asconf->snd_count--;
3389 }
3390 }
3391 break;
3392 case SCTP_INITIATION:
3393 /* resend the INIT */
3394 stcb->asoc.dropped_special_cnt++;
3395 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3396 /*
3397 * If we can get it in, in a few attempts we do
3398 * this, otherwise we let the timer fire.
3399 */
3400 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3401 stcb, net,
3402 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3403 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3404 }
3405 break;
3406 case SCTP_SELECTIVE_ACK:
3407 case SCTP_NR_SELECTIVE_ACK:
3408 /* resend the sack */
3409 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3410 break;
3411 case SCTP_HEARTBEAT_REQUEST:
3412 /* resend a demand HB */
3413 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3414 /*
3415 * Only retransmit if we KNOW we wont destroy the
3416 * tcb
3417 */
3418 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3419 }
3420 break;
3421 case SCTP_SHUTDOWN:
3422 sctp_send_shutdown(stcb, net);
3423 break;
3424 case SCTP_SHUTDOWN_ACK:
3425 sctp_send_shutdown_ack(stcb, net);
3426 break;
3427 case SCTP_COOKIE_ECHO:
3428 {
3429 struct sctp_tmit_chunk *cookie;
3430
3431 cookie = NULL;
3432 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3433 sctp_next) {
3434 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3435 break;
3436 }
3437 }
3438 if (cookie) {
3439 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3440 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3441 cookie->sent = SCTP_DATAGRAM_RESEND;
3442 sctp_stop_all_cookie_timers(stcb);
3443 }
3444 }
3445 break;
3446 case SCTP_COOKIE_ACK:
3447 sctp_send_cookie_ack(stcb);
3448 break;
3449 case SCTP_ASCONF_ACK:
3450 /* resend last asconf ack */
3451 sctp_send_asconf_ack(stcb);
3452 break;
3453 case SCTP_FORWARD_CUM_TSN:
3454 send_forward_tsn(stcb, &stcb->asoc);
3455 break;
3456 /* can't do anything with these */
3457 case SCTP_PACKET_DROPPED:
3458 case SCTP_INITIATION_ACK: /* this should not happen */
3459 case SCTP_HEARTBEAT_ACK:
3460 case SCTP_ABORT_ASSOCIATION:
3461 case SCTP_OPERATION_ERROR:
3462 case SCTP_SHUTDOWN_COMPLETE:
3463 case SCTP_ECN_ECHO:
3464 case SCTP_ECN_CWR:
3465 default:
3466 break;
3467 }
3468 return (0);
3469 }
3470
3471 void
3472 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3473 {
3474 uint32_t i;
3475 uint16_t temp;
3476
3477 /*
3478 * We set things to 0xffff since this is the last delivered sequence
3479 * and we will be sending in 0 after the reset.
3480 */
3481
3482 if (number_entries) {
3483 for (i = 0; i < number_entries; i++) {
3484 temp = ntohs(list[i]);
3485 if (temp >= stcb->asoc.streamincnt) {
3486 continue;
3487 }
3488 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3489 }
3490 } else {
3491 list = NULL;
3492 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3493 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3494 }
3495 }
3496 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3497 }
3498
3499 static void
3500 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3501 {
3502 uint32_t i;
3503 uint16_t temp;
3504
3505 if (number_entries > 0) {
3506 for (i = 0; i < number_entries; i++) {
3507 temp = ntohs(list[i]);
3508 if (temp >= stcb->asoc.streamoutcnt) {
3509 /* no such stream */
3510 continue;
3511 }
3512 stcb->asoc.strmout[temp].next_sequence_send = 0;
3513 }
3514 } else {
3515 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3516 stcb->asoc.strmout[i].next_sequence_send = 0;
3517 }
3518 }
3519 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3520 }
3521
3522 static void
3523 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3524 {
3525 uint32_t i;
3526 uint16_t temp;
3527
3528 if (number_entries > 0) {
3529 for (i = 0; i < number_entries; i++) {
3530 temp = ntohs(list[i]);
3531 if (temp >= stcb->asoc.streamoutcnt) {
3532 /* no such stream */
3533 continue;
3534 }
3535 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3536 }
3537 } else {
3538 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3539 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3540 }
3541 }
3542 }
3543
3544
3545 struct sctp_stream_reset_request *
3546 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3547 {
3548 struct sctp_association *asoc;
3549 struct sctp_chunkhdr *ch;
3550 struct sctp_stream_reset_request *r;
3551 struct sctp_tmit_chunk *chk;
3552 int len, clen;
3553
3554 asoc = &stcb->asoc;
3555 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3556 asoc->stream_reset_outstanding = 0;
3557 return (NULL);
3558 }
3559 if (stcb->asoc.str_reset == NULL) {
3560 asoc->stream_reset_outstanding = 0;
3561 return (NULL);
3562 }
3563 chk = stcb->asoc.str_reset;
3564 if (chk->data == NULL) {
3565 return (NULL);
3566 }
3567 if (bchk) {
3568 /* he wants a copy of the chk pointer */
3569 *bchk = chk;
3570 }
3571 clen = chk->send_size;
3572 ch = mtod(chk->data, struct sctp_chunkhdr *);
3573 r = (struct sctp_stream_reset_request *)(ch + 1);
3574 if (ntohl(r->request_seq) == seq) {
3575 /* found it */
3576 return (r);
3577 }
3578 len = SCTP_SIZE32(ntohs(r->ph.param_length));
3579 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3580 /* move to the next one, there can only be a max of two */
3581 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3582 if (ntohl(r->request_seq) == seq) {
3583 return (r);
3584 }
3585 }
3586 /* that seq is not here */
3587 return (NULL);
3588 }
3589
3590 static void
3591 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3592 {
3593 struct sctp_association *asoc;
3594 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3595
3596 if (stcb->asoc.str_reset == NULL) {
3597 return;
3598 }
3599 asoc = &stcb->asoc;
3600
3601 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3602 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3603 TAILQ_REMOVE(&asoc->control_send_queue,
3604 chk,
3605 sctp_next);
3606 if (chk->data) {
3607 sctp_m_freem(chk->data);
3608 chk->data = NULL;
3609 }
3610 asoc->ctrl_queue_cnt--;
3611 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3612 /* sa_ignore NO_NULL_CHK */
3613 stcb->asoc.str_reset = NULL;
3614 }
3615
3616
3617 static int
3618 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3619 uint32_t seq, uint32_t action,
3620 struct sctp_stream_reset_response *respin)
3621 {
3622 uint16_t type;
3623 int lparm_len;
3624 struct sctp_association *asoc = &stcb->asoc;
3625 struct sctp_tmit_chunk *chk;
3626 struct sctp_stream_reset_request *req_param;
3627 struct sctp_stream_reset_out_request *req_out_param;
3628 struct sctp_stream_reset_in_request *req_in_param;
3629 uint32_t number_entries;
3630
3631 if (asoc->stream_reset_outstanding == 0) {
3632 /* duplicate */
3633 return (0);
3634 }
3635 if (seq == stcb->asoc.str_reset_seq_out) {
3636 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3637 if (req_param != NULL) {
3638 stcb->asoc.str_reset_seq_out++;
3639 type = ntohs(req_param->ph.param_type);
3640 lparm_len = ntohs(req_param->ph.param_length);
3641 if (type == SCTP_STR_RESET_OUT_REQUEST) {
3642 int no_clear = 0;
3643
3644 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3645 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3646 asoc->stream_reset_out_is_outstanding = 0;
3647 if (asoc->stream_reset_outstanding)
3648 asoc->stream_reset_outstanding--;
3649 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3650 /* do it */
3651 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3652 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3653 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3654 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3655 /*
3656 * Set it up so we don't stop
3657 * retransmitting
3658 */
3659 asoc->stream_reset_outstanding++;
3660 stcb->asoc.str_reset_seq_out--;
3661 asoc->stream_reset_out_is_outstanding = 1;
3662 no_clear = 1;
3663 } else {
3664 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3665 }
3666 if (no_clear == 0) {
3667 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3668 }
3669 } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3670 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3671 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3672 if (asoc->stream_reset_outstanding)
3673 asoc->stream_reset_outstanding--;
3674 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3675 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3676 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3677 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3678 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3679 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3680 }
3681 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3682 /* Ok we now may have more streams */
3683 int num_stream;
3684
3685 num_stream = stcb->asoc.strm_pending_add_size;
3686 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3687 /* TSNH */
3688 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3689 }
3690 stcb->asoc.strm_pending_add_size = 0;
3691 if (asoc->stream_reset_outstanding)
3692 asoc->stream_reset_outstanding--;
3693 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3694 /* Put the new streams into effect */
3695 int i;
3696
3697 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3698 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3699 }
3700 asoc->streamoutcnt += num_stream;
3701 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3702 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3703 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3704 SCTP_STREAM_CHANGE_DENIED);
3705 } else {
3706 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3707 SCTP_STREAM_CHANGE_FAILED);
3708 }
3709 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3710 if (asoc->stream_reset_outstanding)
3711 asoc->stream_reset_outstanding--;
3712 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3713 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3714 SCTP_STREAM_CHANGE_DENIED);
3715 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3716 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3717 SCTP_STREAM_CHANGE_FAILED);
3718 }
3719 } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3720 /**
3721 * a) Adopt the new in tsn.
3722 * b) reset the map
3723 * c) Adopt the new out-tsn
3724 */
3725 struct sctp_stream_reset_response_tsn *resp;
3726 struct sctp_forward_tsn_chunk fwdtsn;
3727 int abort_flag = 0;
3728
3729 if (respin == NULL) {
3730 /* huh ? */
3731 return (0);
3732 }
3733 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3734 return (0);
3735 }
3736 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3737 resp = (struct sctp_stream_reset_response_tsn *)respin;
3738 asoc->stream_reset_outstanding--;
3739 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3740 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3741 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3742 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3743 if (abort_flag) {
3744 return (1);
3745 }
3746 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3747 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3748 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3749 }
3750 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3751 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3752 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3753
3754 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3755 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3756
3757 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3758 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3759
3760 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3761 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3762 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3763 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3764 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3765 SCTP_ASSOC_RESET_DENIED);
3766 } else {
3767 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3768 SCTP_ASSOC_RESET_FAILED);
3769 }
3770 }
3771 /* get rid of the request and get the request flags */
3772 if (asoc->stream_reset_outstanding == 0) {
3773 sctp_clean_up_stream_reset(stcb);
3774 }
3775 }
3776 }
3777 if (asoc->stream_reset_outstanding == 0) {
3778 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3779 }
3780 return (0);
3781 }
3782
3783 static void
3784 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3785 struct sctp_tmit_chunk *chk,
3786 struct sctp_stream_reset_in_request *req, int trunc)
3787 {
3788 uint32_t seq;
3789 int len, i;
3790 int number_entries;
3791 uint16_t temp;
3792
3793 /*
3794 * peer wants me to send a str-reset to him for my outgoing seq's if
3795 * seq_in is right.
3796 */
3797 struct sctp_association *asoc = &stcb->asoc;
3798
3799 seq = ntohl(req->request_seq);
3800 if (asoc->str_reset_seq_in == seq) {
3801 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3802 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3803 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3804 } else if (trunc) {
3805 /* Can't do it, since they exceeded our buffer size */
3806 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3807 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3808 len = ntohs(req->ph.param_length);
3809 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3810 if (number_entries) {
3811 for (i = 0; i < number_entries; i++) {
3812 temp = ntohs(req->list_of_streams[i]);
3813 if (temp >= stcb->asoc.streamoutcnt) {
3814 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3815 goto bad_boy;
3816 }
3817 req->list_of_streams[i] = temp;
3818 }
3819 for (i = 0; i < number_entries; i++) {
3820 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3821 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3822 }
3823 }
3824 } else {
3825 /* Its all */
3826 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3827 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3828 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3829 }
3830 }
3831 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3832 } else {
3833 /* Can't do it, since we have sent one out */
3834 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3835 }
3836 bad_boy:
3837 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3838 asoc->str_reset_seq_in++;
3839 } else if (asoc->str_reset_seq_in - 1 == seq) {
3840 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3841 } else if (asoc->str_reset_seq_in - 2 == seq) {
3842 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3843 } else {
3844 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3845 }
3846 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3847 }
3848
3849 static int
3850 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3851 struct sctp_tmit_chunk *chk,
3852 struct sctp_stream_reset_tsn_request *req)
3853 {
3854 /* reset all in and out and update the tsn */
3855 /*
3856 * A) reset my str-seq's on in and out. B) Select a receive next,
3857 * and set cum-ack to it. Also process this selected number as a
3858 * fwd-tsn as well. C) set in the response my next sending seq.
3859 */
3860 struct sctp_forward_tsn_chunk fwdtsn;
3861 struct sctp_association *asoc = &stcb->asoc;
3862 int abort_flag = 0;
3863 uint32_t seq;
3864
3865 seq = ntohl(req->request_seq);
3866 if (asoc->str_reset_seq_in == seq) {
3867 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3868 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3869 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3870 } else {
3871 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3872 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3873 fwdtsn.ch.chunk_flags = 0;
3874 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3875 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3876 if (abort_flag) {
3877 return (1);
3878 }
3879 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3880 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3881 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3882 }
3883 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3884 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3885 memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3886 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3887 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3888 atomic_add_int(&asoc->sending_seq, 1);
3889 /* save off historical data for retrans */
3890 asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3891 asoc->last_sending_seq[0] = asoc->sending_seq;
3892 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3893 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3894 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3895 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3896 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3897 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3898 }
3899 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3900 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3901 asoc->str_reset_seq_in++;
3902 } else if (asoc->str_reset_seq_in - 1 == seq) {
3903 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3904 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3905 } else if (asoc->str_reset_seq_in - 2 == seq) {
3906 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3907 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3908 } else {
3909 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3910 }
3911 return (0);
3912 }
3913
3914 static void
3915 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3916 struct sctp_tmit_chunk *chk,
3917 struct sctp_stream_reset_out_request *req, int trunc)
3918 {
3919 uint32_t seq, tsn;
3920 int number_entries, len;
3921 struct sctp_association *asoc = &stcb->asoc;
3922
3923 seq = ntohl(req->request_seq);
3924
3925 /* now if its not a duplicate we process it */
3926 if (asoc->str_reset_seq_in == seq) {
3927 len = ntohs(req->ph.param_length);
3928 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3929 /*
3930 * the sender is resetting, handle the list issue.. we must
3931 * a) verify if we can do the reset, if so no problem b) If
3932 * we can't do the reset we must copy the request. c) queue
3933 * it, and setup the data in processor to trigger it off
3934 * when needed and dequeue all the queued data.
3935 */
3936 tsn = ntohl(req->send_reset_at_tsn);
3937
3938 /* move the reset action back one */
3939 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3940 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3941 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3942 } else if (trunc) {
3943 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3944 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3945 /* we can do it now */
3946 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3947 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3948 } else {
3949 /*
3950 * we must queue it up and thus wait for the TSN's
3951 * to arrive that are at or before tsn
3952 */
3953 struct sctp_stream_reset_list *liste;
3954 int siz;
3955
3956 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3957 SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3958 siz, SCTP_M_STRESET);
3959 if (liste == NULL) {
3960 /* gak out of memory */
3961 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3962 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3963 return;
3964 }
3965 liste->seq = seq;
3966 liste->tsn = tsn;
3967 liste->number_entries = number_entries;
3968 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3969 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3970 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3971 }
3972 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3973 asoc->str_reset_seq_in++;
3974 } else if ((asoc->str_reset_seq_in - 1) == seq) {
3975 /*
3976 * one seq back, just echo back last action since my
3977 * response was lost.
3978 */
3979 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3980 } else if ((asoc->str_reset_seq_in - 2) == seq) {
3981 /*
3982 * two seq back, just echo back last action since my
3983 * response was lost.
3984 */
3985 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3986 } else {
3987 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3988 }
3989 }
3990
3991 static void
3992 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3993 struct sctp_stream_reset_add_strm *str_add)
3994 {
3995 /*
3996 * Peer is requesting to add more streams. If its within our
3997 * max-streams we will allow it.
3998 */
3999 uint32_t num_stream, i;
4000 uint32_t seq;
4001 struct sctp_association *asoc = &stcb->asoc;
4002 struct sctp_queued_to_read *ctl, *nctl;
4003
4004 /* Get the number. */
4005 seq = ntohl(str_add->request_seq);
4006 num_stream = ntohs(str_add->number_of_streams);
4007 /* Now what would be the new total? */
4008 if (asoc->str_reset_seq_in == seq) {
4009 num_stream += stcb->asoc.streamincnt;
4010 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4011 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4012 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4013 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4014 (num_stream > 0xffff)) {
4015 /* We must reject it they ask for to many */
4016 denied:
4017 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4018 } else {
4019 /* Ok, we can do that :-) */
4020 struct sctp_stream_in *oldstrm;
4021
4022 /* save off the old */
4023 oldstrm = stcb->asoc.strmin;
4024 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4025 (num_stream * sizeof(struct sctp_stream_in)),
4026 SCTP_M_STRMI);
4027 if (stcb->asoc.strmin == NULL) {
4028 stcb->asoc.strmin = oldstrm;
4029 goto denied;
4030 }
4031 /* copy off the old data */
4032 for (i = 0; i < stcb->asoc.streamincnt; i++) {
4033 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4034 stcb->asoc.strmin[i].stream_no = i;
4035 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
4036 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4037 /* now anything on those queues? */
4038 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
4039 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
4040 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
4041 }
4042 }
4043 /* Init the new streams */
4044 for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4045 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4046 stcb->asoc.strmin[i].stream_no = i;
4047 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
4048 stcb->asoc.strmin[i].delivery_started = 0;
4049 }
4050 SCTP_FREE(oldstrm, SCTP_M_STRMI);
4051 /* update the size */
4052 stcb->asoc.streamincnt = num_stream;
4053 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4054 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4055 }
4056 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4057 asoc->str_reset_seq_in++;
4058 } else if ((asoc->str_reset_seq_in - 1) == seq) {
4059 /*
4060 * one seq back, just echo back last action since my
4061 * response was lost.
4062 */
4063 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4064 } else if ((asoc->str_reset_seq_in - 2) == seq) {
4065 /*
4066 * two seq back, just echo back last action since my
4067 * response was lost.
4068 */
4069 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4070 } else {
4071 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4072
4073 }
4074 }
4075
4076 static void
4077 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4078 struct sctp_stream_reset_add_strm *str_add)
4079 {
4080 /*
4081 * Peer is requesting to add more streams. If its within our
4082 * max-streams we will allow it.
4083 */
4084 uint16_t num_stream;
4085 uint32_t seq;
4086 struct sctp_association *asoc = &stcb->asoc;
4087
4088 /* Get the number. */
4089 seq = ntohl(str_add->request_seq);
4090 num_stream = ntohs(str_add->number_of_streams);
4091 /* Now what would be the new total? */
4092 if (asoc->str_reset_seq_in == seq) {
4093 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4094 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4095 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4096 } else if (stcb->asoc.stream_reset_outstanding) {
4097 /* We must reject it we have something pending */
4098 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4099 } else {
4100 /* Ok, we can do that :-) */
4101 int mychk;
4102
4103 mychk = stcb->asoc.streamoutcnt;
4104 mychk += num_stream;
4105 if (mychk < 0x10000) {
4106 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4107 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4108 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4109 }
4110 } else {
4111 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4112 }
4113 }
4114 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4115 asoc->str_reset_seq_in++;
4116 } else if ((asoc->str_reset_seq_in - 1) == seq) {
4117 /*
4118 * one seq back, just echo back last action since my
4119 * response was lost.
4120 */
4121 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4122 } else if ((asoc->str_reset_seq_in - 2) == seq) {
4123 /*
4124 * two seq back, just echo back last action since my
4125 * response was lost.
4126 */
4127 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4128 } else {
4129 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4130 }
4131 }
4132
4133 #ifdef __GNUC__
4134 __attribute__((noinline))
4135 #endif
4136 static int
4137 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4138 struct sctp_chunkhdr *ch_req)
4139 {
4140 uint16_t remaining_length, param_len, ptype;
4141 struct sctp_paramhdr pstore;
4142 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4143 uint32_t seq = 0;
4144 int num_req = 0;
4145 int trunc = 0;
4146 struct sctp_tmit_chunk *chk;
4147 struct sctp_chunkhdr *ch;
4148 struct sctp_paramhdr *ph;
4149 int ret_code = 0;
4150 int num_param = 0;
4151
4152 /* now it may be a reset or a reset-response */
4153 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4154
4155 /* setup for adding the response */
4156 sctp_alloc_a_chunk(stcb, chk);
4157 if (chk == NULL) {
4158 return (ret_code);
4159 }
4160 chk->copy_by_ref = 0;
4161 chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4162 chk->rec.chunk_id.can_take_data = 0;
4163 chk->flags = 0;
4164 chk->asoc = &stcb->asoc;
4165 chk->no_fr_allowed = 0;
4166 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4167 chk->book_size_scale = 0;
4168 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4169 if (chk->data == NULL) {
4170 strres_nochunk:
4171 if (chk->data) {
4172 sctp_m_freem(chk->data);
4173 chk->data = NULL;
4174 }
4175 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4176 return (ret_code);
4177 }
4178 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4179
4180 /* setup chunk parameters */
4181 chk->sent = SCTP_DATAGRAM_UNSENT;
4182 chk->snd_count = 0;
4183 chk->whoTo = NULL;
4184
4185 ch = mtod(chk->data, struct sctp_chunkhdr *);
4186 ch->chunk_type = SCTP_STREAM_RESET;
4187 ch->chunk_flags = 0;
4188 ch->chunk_length = htons(chk->send_size);
4189 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4190 offset += sizeof(struct sctp_chunkhdr);
4191 while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4192 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4193 if (ph == NULL) {
4194 /* TSNH */
4195 break;
4196 }
4197 param_len = ntohs(ph->param_length);
4198 if ((param_len > remaining_length) ||
4199 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4200 /* bad parameter length */
4201 break;
4202 }
4203 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4204 (uint8_t *) & cstore);
4205 if (ph == NULL) {
4206 /* TSNH */
4207 break;
4208 }
4209 ptype = ntohs(ph->param_type);
4210 num_param++;
4211 if (param_len > sizeof(cstore)) {
4212 trunc = 1;
4213 } else {
4214 trunc = 0;
4215 }
4216 if (num_param > SCTP_MAX_RESET_PARAMS) {
4217 /* hit the max of parameters already sorry.. */
4218 break;
4219 }
4220 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4221 struct sctp_stream_reset_out_request *req_out;
4222
4223 if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4224 break;
4225 }
4226 req_out = (struct sctp_stream_reset_out_request *)ph;
4227 num_req++;
4228 if (stcb->asoc.stream_reset_outstanding) {
4229 seq = ntohl(req_out->response_seq);
4230 if (seq == stcb->asoc.str_reset_seq_out) {
4231 /* implicit ack */
4232 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4233 }
4234 }
4235 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4236 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4237 struct sctp_stream_reset_add_strm *str_add;
4238
4239 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4240 break;
4241 }
4242 str_add = (struct sctp_stream_reset_add_strm *)ph;
4243 num_req++;
4244 sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4245 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4246 struct sctp_stream_reset_add_strm *str_add;
4247
4248 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4249 break;
4250 }
4251 str_add = (struct sctp_stream_reset_add_strm *)ph;
4252 num_req++;
4253 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4254 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4255 struct sctp_stream_reset_in_request *req_in;
4256
4257 num_req++;
4258 req_in = (struct sctp_stream_reset_in_request *)ph;
4259 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4260 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4261 struct sctp_stream_reset_tsn_request *req_tsn;
4262
4263 num_req++;
4264 req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4265 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4266 ret_code = 1;
4267 goto strres_nochunk;
4268 }
4269 /* no more */
4270 break;
4271 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4272 struct sctp_stream_reset_response *resp;
4273 uint32_t result;
4274
4275 if (param_len < sizeof(struct sctp_stream_reset_response)) {
4276 break;
4277 }
4278 resp = (struct sctp_stream_reset_response *)ph;
4279 seq = ntohl(resp->response_seq);
4280 result = ntohl(resp->result);
4281 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4282 ret_code = 1;
4283 goto strres_nochunk;
4284 }
4285 } else {
4286 break;
4287 }
4288 offset += SCTP_SIZE32(param_len);
4289 if (remaining_length >= SCTP_SIZE32(param_len)) {
4290 remaining_length -= SCTP_SIZE32(param_len);
4291 } else {
4292 remaining_length = 0;
4293 }
4294 }
4295 if (num_req == 0) {
4296 /* we have no response free the stuff */
4297 goto strres_nochunk;
4298 }
4299 /* ok we have a chunk to link in */
4300 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4301 chk,
4302 sctp_next);
4303 stcb->asoc.ctrl_queue_cnt++;
4304 return (ret_code);
4305 }
4306
4307 /*
4308 * Handle a router or endpoints report of a packet loss, there are two ways
4309 * to handle this, either we get the whole packet and must disect it
4310 * ourselves (possibly with truncation and or corruption) or it is a summary
4311 * from a middle box that did the disectting for us.
4312 */
4313 static void
4314 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4315 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4316 {
4317 uint32_t bottle_bw, on_queue;
4318 uint16_t trunc_len;
4319 unsigned int chlen;
4320 unsigned int at;
4321 struct sctp_chunk_desc desc;
4322 struct sctp_chunkhdr *ch;
4323
4324 chlen = ntohs(cp->ch.chunk_length);
4325 chlen -= sizeof(struct sctp_pktdrop_chunk);
4326 /* XXX possible chlen underflow */
4327 if (chlen == 0) {
4328 ch = NULL;
4329 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4330 SCTP_STAT_INCR(sctps_pdrpbwrpt);
4331 } else {
4332 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4333 chlen -= sizeof(struct sctphdr);
4334 /* XXX possible chlen underflow */
4335 memset(&desc, 0, sizeof(desc));
4336 }
4337 trunc_len = (uint16_t) ntohs(cp->trunc_len);
4338 if (trunc_len > limit) {
4339 trunc_len = limit;
4340 }
4341 /* now the chunks themselves */
4342 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4343 desc.chunk_type = ch->chunk_type;
4344 /* get amount we need to move */
4345 at = ntohs(ch->chunk_length);
4346 if (at < sizeof(struct sctp_chunkhdr)) {
4347 /* corrupt chunk, maybe at the end? */
4348 SCTP_STAT_INCR(sctps_pdrpcrupt);
4349 break;
4350 }
4351 if (trunc_len == 0) {
4352 /* we are supposed to have all of it */
4353 if (at > chlen) {
4354 /* corrupt skip it */
4355 SCTP_STAT_INCR(sctps_pdrpcrupt);
4356 break;
4357 }
4358 } else {
4359 /* is there enough of it left ? */
4360 if (desc.chunk_type == SCTP_DATA) {
4361 if (chlen < (sizeof(struct sctp_data_chunk) +
4362 sizeof(desc.data_bytes))) {
4363 break;
4364 }
4365 } else {
4366 if (chlen < sizeof(struct sctp_chunkhdr)) {
4367 break;
4368 }
4369 }
4370 }
4371 if (desc.chunk_type == SCTP_DATA) {
4372 /* can we get out the tsn? */
4373 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4374 SCTP_STAT_INCR(sctps_pdrpmbda);
4375
4376 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4377 /* yep */
4378 struct sctp_data_chunk *dcp;
4379 uint8_t *ddp;
4380 unsigned int iii;
4381
4382 dcp = (struct sctp_data_chunk *)ch;
4383 ddp = (uint8_t *) (dcp + 1);
4384 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4385 desc.data_bytes[iii] = ddp[iii];
4386 }
4387 desc.tsn_ifany = dcp->dp.tsn;
4388 } else {
4389 /* nope we are done. */
4390 SCTP_STAT_INCR(sctps_pdrpnedat);
4391 break;
4392 }
4393 } else {
4394 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4395 SCTP_STAT_INCR(sctps_pdrpmbct);
4396 }
4397
4398 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4399 SCTP_STAT_INCR(sctps_pdrppdbrk);
4400 break;
4401 }
4402 if (SCTP_SIZE32(at) > chlen) {
4403 break;
4404 }
4405 chlen -= SCTP_SIZE32(at);
4406 if (chlen < sizeof(struct sctp_chunkhdr)) {
4407 /* done, none left */
4408 break;
4409 }
4410 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4411 }
4412 /* Now update any rwnd --- possibly */
4413 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4414 /* From a peer, we get a rwnd report */
4415 uint32_t a_rwnd;
4416
4417 SCTP_STAT_INCR(sctps_pdrpfehos);
4418
4419 bottle_bw = ntohl(cp->bottle_bw);
4420 on_queue = ntohl(cp->current_onq);
4421 if (bottle_bw && on_queue) {
4422 /* a rwnd report is in here */
4423 if (bottle_bw > on_queue)
4424 a_rwnd = bottle_bw - on_queue;
4425 else
4426 a_rwnd = 0;
4427
4428 if (a_rwnd == 0)
4429 stcb->asoc.peers_rwnd = 0;
4430 else {
4431 if (a_rwnd > stcb->asoc.total_flight) {
4432 stcb->asoc.peers_rwnd =
4433 a_rwnd - stcb->asoc.total_flight;
4434 } else {
4435 stcb->asoc.peers_rwnd = 0;
4436 }
4437 if (stcb->asoc.peers_rwnd <
4438 stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4439 /* SWS sender side engages */
4440 stcb->asoc.peers_rwnd = 0;
4441 }
4442 }
4443 }
4444 } else {
4445 SCTP_STAT_INCR(sctps_pdrpfmbox);
4446 }
4447
4448 /* now middle boxes in sat networks get a cwnd bump */
4449 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4450 (stcb->asoc.sat_t3_loss_recovery == 0) &&
4451 (stcb->asoc.sat_network)) {
4452 /*
4453 * This is debateable but for sat networks it makes sense
4454 * Note if a T3 timer has went off, we will prohibit any
4455 * changes to cwnd until we exit the t3 loss recovery.
4456 */
4457 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4458 net, cp, &bottle_bw, &on_queue);
4459 }
4460 }
4461
4462 /*
4463 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4464 * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4465 * offset: offset into the mbuf chain to first chunkhdr - length: is the
4466 * length of the complete packet outputs: - length: modified to remaining
4467 * length after control processing - netp: modified to new sctp_nets after
4468 * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4469 * bad packet,...) otherwise return the tcb for this packet
4470 */
4471 #ifdef __GNUC__
4472 __attribute__((noinline))
4473 #endif
4474 static struct sctp_tcb *
4475 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4476 struct sockaddr *src, struct sockaddr *dst,
4477 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4478 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4479 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4480 uint32_t vrf_id, uint16_t port)
4481 {
4482 struct sctp_association *asoc;
4483 struct mbuf *op_err;
4484 char msg[SCTP_DIAG_INFO_LEN];
4485 uint32_t vtag_in;
4486 int num_chunks = 0; /* number of control chunks processed */
4487 uint32_t chk_length;
4488 int ret;
4489 int abort_no_unlock = 0;
4490 int ecne_seen = 0;
4491
4492 /*
4493 * How big should this be, and should it be alloc'd? Lets try the
4494 * d-mtu-ceiling for now (2k) and that should hopefully work ...
4495 * until we get into jumbo grams and such..
4496 */
4497 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4498 struct sctp_tcb *locked_tcb = stcb;
4499 int got_auth = 0;
4500 uint32_t auth_offset = 0, auth_len = 0;
4501 int auth_skipped = 0;
4502 int asconf_cnt = 0;
4503
4504 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4505 struct socket *so;
4506
4507 #endif
4508
4509 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4510 iphlen, *offset, length, (void *)stcb);
4511
4512 /* validate chunk header length... */
4513 if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4514 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4515 ntohs(ch->chunk_length));
4516 if (locked_tcb) {
4517 SCTP_TCB_UNLOCK(locked_tcb);
4518 }
4519 return (NULL);
4520 }
4521 /*
4522 * validate the verification tag
4523 */
4524 vtag_in = ntohl(sh->v_tag);
4525
4526 if (locked_tcb) {
4527 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4528 }
4529 if (ch->chunk_type == SCTP_INITIATION) {
4530 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4531 ntohs(ch->chunk_length), vtag_in);
4532 if (vtag_in != 0) {
4533 /* protocol error- silently discard... */
4534 SCTP_STAT_INCR(sctps_badvtag);
4535 if (locked_tcb) {
4536 SCTP_TCB_UNLOCK(locked_tcb);
4537 }
4538 return (NULL);
4539 }
4540 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4541 /*
4542 * If there is no stcb, skip the AUTH chunk and process
4543 * later after a stcb is found (to validate the lookup was
4544 * valid.
4545 */
4546 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4547 (stcb == NULL) &&
4548 (inp->auth_supported == 1)) {
4549 /* save this chunk for later processing */
4550 auth_skipped = 1;
4551 auth_offset = *offset;
4552 auth_len = ntohs(ch->chunk_length);
4553
4554 /* (temporarily) move past this chunk */
4555 *offset += SCTP_SIZE32(auth_len);
4556 if (*offset >= length) {
4557 /* no more data left in the mbuf chain */
4558 *offset = length;
4559 if (locked_tcb) {
4560 SCTP_TCB_UNLOCK(locked_tcb);
4561 }
4562 return (NULL);
4563 }
4564 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4565 sizeof(struct sctp_chunkhdr), chunk_buf);
4566 }
4567 if (ch == NULL) {
4568 /* Help */
4569 *offset = length;
4570 if (locked_tcb) {
4571 SCTP_TCB_UNLOCK(locked_tcb);
4572 }
4573 return (NULL);
4574 }
4575 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4576 goto process_control_chunks;
4577 }
4578 /*
4579 * first check if it's an ASCONF with an unknown src addr we
4580 * need to look inside to find the association
4581 */
4582 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4583 struct sctp_chunkhdr *asconf_ch = ch;
4584 uint32_t asconf_offset = 0, asconf_len = 0;
4585
4586 /* inp's refcount may be reduced */
4587 SCTP_INP_INCR_REF(inp);
4588
4589 asconf_offset = *offset;
4590 do {
4591 asconf_len = ntohs(asconf_ch->chunk_length);
4592 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4593 break;
4594 stcb = sctp_findassociation_ep_asconf(m,
4595 *offset,
4596 dst,
4597 sh, &inp, netp, vrf_id);
4598 if (stcb != NULL)
4599 break;
4600 asconf_offset += SCTP_SIZE32(asconf_len);
4601 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4602 sizeof(struct sctp_chunkhdr), chunk_buf);
4603 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4604 if (stcb == NULL) {
4605 /*
4606 * reduce inp's refcount if not reduced in
4607 * sctp_findassociation_ep_asconf().
4608 */
4609 SCTP_INP_DECR_REF(inp);
4610 } else {
4611 locked_tcb = stcb;
4612 }
4613
4614 /* now go back and verify any auth chunk to be sure */
4615 if (auth_skipped && (stcb != NULL)) {
4616 struct sctp_auth_chunk *auth;
4617
4618 auth = (struct sctp_auth_chunk *)
4619 sctp_m_getptr(m, auth_offset,
4620 auth_len, chunk_buf);
4621 got_auth = 1;
4622 auth_skipped = 0;
4623 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4624 auth_offset)) {
4625 /* auth HMAC failed so dump it */
4626 *offset = length;
4627 if (locked_tcb) {
4628 SCTP_TCB_UNLOCK(locked_tcb);
4629 }
4630 return (NULL);
4631 } else {
4632 /* remaining chunks are HMAC checked */
4633 stcb->asoc.authenticated = 1;
4634 }
4635 }
4636 }
4637 if (stcb == NULL) {
4638 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4639 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4640 msg);
4641 /* no association, so it's out of the blue... */
4642 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4643 mflowtype, mflowid, inp->fibnum,
4644 vrf_id, port);
4645 *offset = length;
4646 if (locked_tcb) {
4647 SCTP_TCB_UNLOCK(locked_tcb);
4648 }
4649 return (NULL);
4650 }
4651 asoc = &stcb->asoc;
4652 /* ABORT and SHUTDOWN can use either v_tag... */
4653 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4654 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4655 (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4656 /* Take the T-bit always into account. */
4657 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4658 (vtag_in == asoc->my_vtag)) ||
4659 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4660 (vtag_in == asoc->peer_vtag))) {
4661 /* this is valid */
4662 } else {
4663 /* drop this packet... */
4664 SCTP_STAT_INCR(sctps_badvtag);
4665 if (locked_tcb) {
4666 SCTP_TCB_UNLOCK(locked_tcb);
4667 }
4668 return (NULL);
4669 }
4670 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4671 if (vtag_in != asoc->my_vtag) {
4672 /*
4673 * this could be a stale SHUTDOWN-ACK or the
4674 * peer never got the SHUTDOWN-COMPLETE and
4675 * is still hung; we have started a new asoc
4676 * but it won't complete until the shutdown
4677 * is completed
4678 */
4679 if (locked_tcb) {
4680 SCTP_TCB_UNLOCK(locked_tcb);
4681 }
4682 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4683 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4684 msg);
4685 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4686 sh, inp, op_err,
4687 mflowtype, mflowid, fibnum,
4688 vrf_id, port);
4689 return (NULL);
4690 }
4691 } else {
4692 /* for all other chunks, vtag must match */
4693 if (vtag_in != asoc->my_vtag) {
4694 /* invalid vtag... */
4695 SCTPDBG(SCTP_DEBUG_INPUT3,
4696 "invalid vtag: %xh, expect %xh\n",
4697 vtag_in, asoc->my_vtag);
4698 SCTP_STAT_INCR(sctps_badvtag);
4699 if (locked_tcb) {
4700 SCTP_TCB_UNLOCK(locked_tcb);
4701 }
4702 *offset = length;
4703 return (NULL);
4704 }
4705 }
4706 } /* end if !SCTP_COOKIE_ECHO */
4707 /*
4708 * process all control chunks...
4709 */
4710 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4711 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4712 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4713 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4714 /* implied cookie-ack.. we must have lost the ack */
4715 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4716 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4717 stcb->asoc.overall_error_count,
4718 0,
4719 SCTP_FROM_SCTP_INPUT,
4720 __LINE__);
4721 }
4722 stcb->asoc.overall_error_count = 0;
4723 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4724 *netp);
4725 }
4726 process_control_chunks:
4727 while (IS_SCTP_CONTROL(ch)) {
4728 /* validate chunk length */
4729 chk_length = ntohs(ch->chunk_length);
4730 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4731 ch->chunk_type, chk_length);
4732 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4733 if (chk_length < sizeof(*ch) ||
4734 (*offset + (int)chk_length) > length) {
4735 *offset = length;
4736 if (locked_tcb) {
4737 SCTP_TCB_UNLOCK(locked_tcb);
4738 }
4739 return (NULL);
4740 }
4741 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4742 /*
4743 * INIT-ACK only gets the init ack "header" portion only
4744 * because we don't have to process the peer's COOKIE. All
4745 * others get a complete chunk.
4746 */
4747 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4748 (ch->chunk_type == SCTP_INITIATION)) {
4749 /* get an init-ack chunk */
4750 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4751 sizeof(struct sctp_init_ack_chunk), chunk_buf);
4752 if (ch == NULL) {
4753 *offset = length;
4754 if (locked_tcb) {
4755 SCTP_TCB_UNLOCK(locked_tcb);
4756 }
4757 return (NULL);
4758 }
4759 } else {
4760 /* For cookies and all other chunks. */
4761 if (chk_length > sizeof(chunk_buf)) {
4762 /*
4763 * use just the size of the chunk buffer so
4764 * the front part of our chunks fit in
4765 * contiguous space up to the chunk buffer
4766 * size (508 bytes). For chunks that need to
4767 * get more than that they must use the
4768 * sctp_m_getptr() function or other means
4769 * (e.g. know how to parse mbuf chains).
4770 * Cookies do this already.
4771 */
4772 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4773 (sizeof(chunk_buf) - 4),
4774 chunk_buf);
4775 if (ch == NULL) {
4776 *offset = length;
4777 if (locked_tcb) {
4778 SCTP_TCB_UNLOCK(locked_tcb);
4779 }
4780 return (NULL);
4781 }
4782 } else {
4783 /* We can fit it all */
4784 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4785 chk_length, chunk_buf);
4786 if (ch == NULL) {
4787 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4788 *offset = length;
4789 if (locked_tcb) {
4790 SCTP_TCB_UNLOCK(locked_tcb);
4791 }
4792 return (NULL);
4793 }
4794 }
4795 }
4796 num_chunks++;
4797 /* Save off the last place we got a control from */
4798 if (stcb != NULL) {
4799 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4800 /*
4801 * allow last_control to be NULL if
4802 * ASCONF... ASCONF processing will find the
4803 * right net later
4804 */
4805 if ((netp != NULL) && (*netp != NULL))
4806 stcb->asoc.last_control_chunk_from = *netp;
4807 }
4808 }
4809 #ifdef SCTP_AUDITING_ENABLED
4810 sctp_audit_log(0xB0, ch->chunk_type);
4811 #endif
4812
4813 /* check to see if this chunk required auth, but isn't */
4814 if ((stcb != NULL) &&
4815 (stcb->asoc.auth_supported == 1) &&
4816 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4817 !stcb->asoc.authenticated) {
4818 /* "silently" ignore */
4819 SCTP_STAT_INCR(sctps_recvauthmissing);
4820 goto next_chunk;
4821 }
4822 switch (ch->chunk_type) {
4823 case SCTP_INITIATION:
4824 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4825 /* The INIT chunk must be the only chunk. */
4826 if ((num_chunks > 1) ||
4827 (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4828 /* RFC 4960 requires that no ABORT is sent */
4829 *offset = length;
4830 if (locked_tcb) {
4831 SCTP_TCB_UNLOCK(locked_tcb);
4832 }
4833 return (NULL);
4834 }
4835 /* Honor our resource limit. */
4836 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4837 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4838 sctp_abort_association(inp, stcb, m, iphlen,
4839 src, dst, sh, op_err,
4840 mflowtype, mflowid,
4841 vrf_id, port);
4842 *offset = length;
4843 return (NULL);
4844 }
4845 sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4846 (struct sctp_init_chunk *)ch, inp,
4847 stcb, *netp, &abort_no_unlock,
4848 mflowtype, mflowid,
4849 vrf_id, port);
4850 *offset = length;
4851 if ((!abort_no_unlock) && (locked_tcb)) {
4852 SCTP_TCB_UNLOCK(locked_tcb);
4853 }
4854 return (NULL);
4855 break;
4856 case SCTP_PAD_CHUNK:
4857 break;
4858 case SCTP_INITIATION_ACK:
4859 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4860 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4861 /* We are not interested anymore */
4862 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4863 ;
4864 } else {
4865 if ((locked_tcb != NULL) && (locked_tcb != stcb)) {
4866 /* Very unlikely */
4867 SCTP_TCB_UNLOCK(locked_tcb);
4868 }
4869 *offset = length;
4870 if (stcb) {
4871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4872 so = SCTP_INP_SO(inp);
4873 atomic_add_int(&stcb->asoc.refcnt, 1);
4874 SCTP_TCB_UNLOCK(stcb);
4875 SCTP_SOCKET_LOCK(so, 1);
4876 SCTP_TCB_LOCK(stcb);
4877 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4878 #endif
4879 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4880 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4881 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4882 SCTP_SOCKET_UNLOCK(so, 1);
4883 #endif
4884 }
4885 return (NULL);
4886 }
4887 }
4888 /* The INIT-ACK chunk must be the only chunk. */
4889 if ((num_chunks > 1) ||
4890 (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4891 *offset = length;
4892 if (locked_tcb) {
4893 SCTP_TCB_UNLOCK(locked_tcb);
4894 }
4895 return (NULL);
4896 }
4897 if ((netp) && (*netp)) {
4898 ret = sctp_handle_init_ack(m, iphlen, *offset,
4899 src, dst, sh,
4900 (struct sctp_init_ack_chunk *)ch,
4901 stcb, *netp,
4902 &abort_no_unlock,
4903 mflowtype, mflowid,
4904 vrf_id);
4905 } else {
4906 ret = -1;
4907 }
4908 *offset = length;
4909 if (abort_no_unlock) {
4910 return (NULL);
4911 }
4912 /*
4913 * Special case, I must call the output routine to
4914 * get the cookie echoed
4915 */
4916 if ((stcb != NULL) && (ret == 0)) {
4917 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4918 }
4919 if (locked_tcb) {
4920 SCTP_TCB_UNLOCK(locked_tcb);
4921 }
4922 return (NULL);
4923 break;
4924 case SCTP_SELECTIVE_ACK:
4925 {
4926 struct sctp_sack_chunk *sack;
4927 int abort_now = 0;
4928 uint32_t a_rwnd, cum_ack;
4929 uint16_t num_seg, num_dup;
4930 uint8_t flags;
4931 int offset_seg, offset_dup;
4932
4933 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4934 SCTP_STAT_INCR(sctps_recvsacks);
4935 if (stcb == NULL) {
4936 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4937 break;
4938 }
4939 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4940 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4941 break;
4942 }
4943 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4944 /*-
4945 * If we have sent a shutdown-ack, we will pay no
4946 * attention to a sack sent in to us since
4947 * we don't care anymore.
4948 */
4949 break;
4950 }
4951 sack = (struct sctp_sack_chunk *)ch;
4952 flags = ch->chunk_flags;
4953 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4954 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4955 num_dup = ntohs(sack->sack.num_dup_tsns);
4956 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4957 if (sizeof(struct sctp_sack_chunk) +
4958 num_seg * sizeof(struct sctp_gap_ack_block) +
4959 num_dup * sizeof(uint32_t) != chk_length) {
4960 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4961 break;
4962 }
4963 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4964 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4965 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4966 cum_ack, num_seg, a_rwnd);
4967 stcb->asoc.seen_a_sack_this_pkt = 1;
4968 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4969 (num_seg == 0) &&
4970 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4971 (stcb->asoc.saw_sack_with_frags == 0) &&
4972 (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4973 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4974 ) {
4975 /*
4976 * We have a SIMPLE sack having no
4977 * prior segments and data on sent
4978 * queue to be acked.. Use the
4979 * faster path sack processing. We
4980 * also allow window update sacks
4981 * with no missing segments to go
4982 * this way too.
4983 */
4984 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4985 } else {
4986 if (netp && *netp)
4987 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4988 num_seg, 0, num_dup, &abort_now, flags,
4989 cum_ack, a_rwnd, ecne_seen);
4990 }
4991 if (abort_now) {
4992 /* ABORT signal from sack processing */
4993 *offset = length;
4994 return (NULL);
4995 }
4996 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4997 TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4998 (stcb->asoc.stream_queue_cnt == 0)) {
4999 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5000 }
5001 }
5002 break;
5003 /*
5004 * EY - nr_sack: If the received chunk is an
5005 * nr_sack chunk
5006 */
5007 case SCTP_NR_SELECTIVE_ACK:
5008 {
5009 struct sctp_nr_sack_chunk *nr_sack;
5010 int abort_now = 0;
5011 uint32_t a_rwnd, cum_ack;
5012 uint16_t num_seg, num_nr_seg, num_dup;
5013 uint8_t flags;
5014 int offset_seg, offset_dup;
5015
5016 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
5017 SCTP_STAT_INCR(sctps_recvsacks);
5018 if (stcb == NULL) {
5019 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
5020 break;
5021 }
5022 if (stcb->asoc.nrsack_supported == 0) {
5023 goto unknown_chunk;
5024 }
5025 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5026 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
5027 break;
5028 }
5029 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5030 /*-
5031 * If we have sent a shutdown-ack, we will pay no
5032 * attention to a sack sent in to us since
5033 * we don't care anymore.
5034 */
5035 break;
5036 }
5037 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5038 flags = ch->chunk_flags;
5039 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5040 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5041 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5042 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5043 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
5044 if (sizeof(struct sctp_nr_sack_chunk) +
5045 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5046 num_dup * sizeof(uint32_t) != chk_length) {
5047 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5048 break;
5049 }
5050 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5051 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5052 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5053 cum_ack, num_seg, a_rwnd);
5054 stcb->asoc.seen_a_sack_this_pkt = 1;
5055 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5056 (num_seg == 0) && (num_nr_seg == 0) &&
5057 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5058 (stcb->asoc.saw_sack_with_frags == 0) &&
5059 (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5060 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5061 /*
5062 * We have a SIMPLE sack having no
5063 * prior segments and data on sent
5064 * queue to be acked. Use the faster
5065 * path sack processing. We also
5066 * allow window update sacks with no
5067 * missing segments to go this way
5068 * too.
5069 */
5070 sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5071 &abort_now, ecne_seen);
5072 } else {
5073 if (netp && *netp)
5074 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5075 num_seg, num_nr_seg, num_dup, &abort_now, flags,
5076 cum_ack, a_rwnd, ecne_seen);
5077 }
5078 if (abort_now) {
5079 /* ABORT signal from sack processing */
5080 *offset = length;
5081 return (NULL);
5082 }
5083 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5084 TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5085 (stcb->asoc.stream_queue_cnt == 0)) {
5086 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5087 }
5088 }
5089 break;
5090
5091 case SCTP_HEARTBEAT_REQUEST:
5092 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5093 if ((stcb) && netp && *netp) {
5094 SCTP_STAT_INCR(sctps_recvheartbeat);
5095 sctp_send_heartbeat_ack(stcb, m, *offset,
5096 chk_length, *netp);
5097
5098 /* He's alive so give him credit */
5099 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5100 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5101 stcb->asoc.overall_error_count,
5102 0,
5103 SCTP_FROM_SCTP_INPUT,
5104 __LINE__);
5105 }
5106 stcb->asoc.overall_error_count = 0;
5107 }
5108 break;
5109 case SCTP_HEARTBEAT_ACK:
5110 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5111 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5112 /* Its not ours */
5113 *offset = length;
5114 if (locked_tcb) {
5115 SCTP_TCB_UNLOCK(locked_tcb);
5116 }
5117 return (NULL);
5118 }
5119 /* He's alive so give him credit */
5120 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5121 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5122 stcb->asoc.overall_error_count,
5123 0,
5124 SCTP_FROM_SCTP_INPUT,
5125 __LINE__);
5126 }
5127 stcb->asoc.overall_error_count = 0;
5128 SCTP_STAT_INCR(sctps_recvheartbeatack);
5129 if (netp && *netp)
5130 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5131 stcb, *netp);
5132 break;
5133 case SCTP_ABORT_ASSOCIATION:
5134 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5135 (void *)stcb);
5136 if ((stcb) && netp && *netp)
5137 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5138 stcb, *netp);
5139 *offset = length;
5140 return (NULL);
5141 break;
5142 case SCTP_SHUTDOWN:
5143 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5144 (void *)stcb);
5145 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5146 *offset = length;
5147 if (locked_tcb) {
5148 SCTP_TCB_UNLOCK(locked_tcb);
5149 }
5150 return (NULL);
5151 }
5152 if (netp && *netp) {
5153 int abort_flag = 0;
5154
5155 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5156 stcb, *netp, &abort_flag);
5157 if (abort_flag) {
5158 *offset = length;
5159 return (NULL);
5160 }
5161 }
5162 break;
5163 case SCTP_SHUTDOWN_ACK:
5164 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5165 if ((stcb) && (netp) && (*netp))
5166 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5167 *offset = length;
5168 return (NULL);
5169 break;
5170
5171 case SCTP_OPERATION_ERROR:
5172 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5173 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5174 *offset = length;
5175 return (NULL);
5176 }
5177 break;
5178 case SCTP_COOKIE_ECHO:
5179 SCTPDBG(SCTP_DEBUG_INPUT3,
5180 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5181 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5182 ;
5183 } else {
5184 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5185 /* We are not interested anymore */
5186 abend:
5187 if (stcb) {
5188 SCTP_TCB_UNLOCK(stcb);
5189 }
5190 *offset = length;
5191 return (NULL);
5192 }
5193 }
5194 /*
5195 * First are we accepting? We do this again here
5196 * since it is possible that a previous endpoint WAS
5197 * listening responded to a INIT-ACK and then
5198 * closed. We opened and bound.. and are now no
5199 * longer listening.
5200 */
5201
5202 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5203 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5204 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5205 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5206 sctp_abort_association(inp, stcb, m, iphlen,
5207 src, dst, sh, op_err,
5208 mflowtype, mflowid,
5209 vrf_id, port);
5210 }
5211 *offset = length;
5212 return (NULL);
5213 } else {
5214 struct mbuf *ret_buf;
5215 struct sctp_inpcb *linp;
5216
5217 if (stcb) {
5218 linp = NULL;
5219 } else {
5220 linp = inp;
5221 }
5222
5223 if (linp) {
5224 SCTP_ASOC_CREATE_LOCK(linp);
5225 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5226 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5227 SCTP_ASOC_CREATE_UNLOCK(linp);
5228 goto abend;
5229 }
5230 }
5231 if (netp) {
5232 ret_buf =
5233 sctp_handle_cookie_echo(m, iphlen,
5234 *offset,
5235 src, dst,
5236 sh,
5237 (struct sctp_cookie_echo_chunk *)ch,
5238 &inp, &stcb, netp,
5239 auth_skipped,
5240 auth_offset,
5241 auth_len,
5242 &locked_tcb,
5243 mflowtype,
5244 mflowid,
5245 vrf_id,
5246 port);
5247 } else {
5248 ret_buf = NULL;
5249 }
5250 if (linp) {
5251 SCTP_ASOC_CREATE_UNLOCK(linp);
5252 }
5253 if (ret_buf == NULL) {
5254 if (locked_tcb) {
5255 SCTP_TCB_UNLOCK(locked_tcb);
5256 }
5257 SCTPDBG(SCTP_DEBUG_INPUT3,
5258 "GAK, null buffer\n");
5259 *offset = length;
5260 return (NULL);
5261 }
5262 /* if AUTH skipped, see if it verified... */
5263 if (auth_skipped) {
5264 got_auth = 1;
5265 auth_skipped = 0;
5266 }
5267 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5268 /*
5269 * Restart the timer if we have
5270 * pending data
5271 */
5272 struct sctp_tmit_chunk *chk;
5273
5274 chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5275 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5276 }
5277 }
5278 break;
5279 case SCTP_COOKIE_ACK:
5280 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5281 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5282 if (locked_tcb) {
5283 SCTP_TCB_UNLOCK(locked_tcb);
5284 }
5285 return (NULL);
5286 }
5287 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5288 /* We are not interested anymore */
5289 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5290 ;
5291 } else if (stcb) {
5292 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5293 so = SCTP_INP_SO(inp);
5294 atomic_add_int(&stcb->asoc.refcnt, 1);
5295 SCTP_TCB_UNLOCK(stcb);
5296 SCTP_SOCKET_LOCK(so, 1);
5297 SCTP_TCB_LOCK(stcb);
5298 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5299 #endif
5300 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5301 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5302 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5303 SCTP_SOCKET_UNLOCK(so, 1);
5304 #endif
5305 *offset = length;
5306 return (NULL);
5307 }
5308 }
5309 /* He's alive so give him credit */
5310 if ((stcb) && netp && *netp) {
5311 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5312 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5313 stcb->asoc.overall_error_count,
5314 0,
5315 SCTP_FROM_SCTP_INPUT,
5316 __LINE__);
5317 }
5318 stcb->asoc.overall_error_count = 0;
5319 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5320 }
5321 break;
5322 case SCTP_ECN_ECHO:
5323 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5324 /* He's alive so give him credit */
5325 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5326 /* Its not ours */
5327 if (locked_tcb) {
5328 SCTP_TCB_UNLOCK(locked_tcb);
5329 }
5330 *offset = length;
5331 return (NULL);
5332 }
5333 if (stcb) {
5334 if (stcb->asoc.ecn_supported == 0) {
5335 goto unknown_chunk;
5336 }
5337 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5338 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5339 stcb->asoc.overall_error_count,
5340 0,
5341 SCTP_FROM_SCTP_INPUT,
5342 __LINE__);
5343 }
5344 stcb->asoc.overall_error_count = 0;
5345 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5346 stcb);
5347 ecne_seen = 1;
5348 }
5349 break;
5350 case SCTP_ECN_CWR:
5351 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5352 /* He's alive so give him credit */
5353 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5354 /* Its not ours */
5355 if (locked_tcb) {
5356 SCTP_TCB_UNLOCK(locked_tcb);
5357 }
5358 *offset = length;
5359 return (NULL);
5360 }
5361 if (stcb) {
5362 if (stcb->asoc.ecn_supported == 0) {
5363 goto unknown_chunk;
5364 }
5365 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5366 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5367 stcb->asoc.overall_error_count,
5368 0,
5369 SCTP_FROM_SCTP_INPUT,
5370 __LINE__);
5371 }
5372 stcb->asoc.overall_error_count = 0;
5373 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5374 }
5375 break;
5376 case SCTP_SHUTDOWN_COMPLETE:
5377 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5378 /* must be first and only chunk */
5379 if ((num_chunks > 1) ||
5380 (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5381 *offset = length;
5382 if (locked_tcb) {
5383 SCTP_TCB_UNLOCK(locked_tcb);
5384 }
5385 return (NULL);
5386 }
5387 if ((stcb) && netp && *netp) {
5388 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5389 stcb, *netp);
5390 }
5391 *offset = length;
5392 return (NULL);
5393 break;
5394 case SCTP_ASCONF:
5395 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5396 /* He's alive so give him credit */
5397 if (stcb) {
5398 if (stcb->asoc.asconf_supported == 0) {
5399 goto unknown_chunk;
5400 }
5401 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5402 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5403 stcb->asoc.overall_error_count,
5404 0,
5405 SCTP_FROM_SCTP_INPUT,
5406 __LINE__);
5407 }
5408 stcb->asoc.overall_error_count = 0;
5409 sctp_handle_asconf(m, *offset, src,
5410 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5411 asconf_cnt++;
5412 }
5413 break;
5414 case SCTP_ASCONF_ACK:
5415 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5416 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5417 /* Its not ours */
5418 if (locked_tcb) {
5419 SCTP_TCB_UNLOCK(locked_tcb);
5420 }
5421 *offset = length;
5422 return (NULL);
5423 }
5424 if ((stcb) && netp && *netp) {
5425 if (stcb->asoc.asconf_supported == 0) {
5426 goto unknown_chunk;
5427 }
5428 /* He's alive so give him credit */
5429 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5430 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5431 stcb->asoc.overall_error_count,
5432 0,
5433 SCTP_FROM_SCTP_INPUT,
5434 __LINE__);
5435 }
5436 stcb->asoc.overall_error_count = 0;
5437 sctp_handle_asconf_ack(m, *offset,
5438 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5439 if (abort_no_unlock)
5440 return (NULL);
5441 }
5442 break;
5443 case SCTP_FORWARD_CUM_TSN:
5444 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5445 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5446 /* Its not ours */
5447 if (locked_tcb) {
5448 SCTP_TCB_UNLOCK(locked_tcb);
5449 }
5450 *offset = length;
5451 return (NULL);
5452 }
5453 /* He's alive so give him credit */
5454 if (stcb) {
5455 int abort_flag = 0;
5456
5457 if (stcb->asoc.prsctp_supported == 0) {
5458 goto unknown_chunk;
5459 }
5460 stcb->asoc.overall_error_count = 0;
5461 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5462 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5463 stcb->asoc.overall_error_count,
5464 0,
5465 SCTP_FROM_SCTP_INPUT,
5466 __LINE__);
5467 }
5468 *fwd_tsn_seen = 1;
5469 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5470 /* We are not interested anymore */
5471 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5472 so = SCTP_INP_SO(inp);
5473 atomic_add_int(&stcb->asoc.refcnt, 1);
5474 SCTP_TCB_UNLOCK(stcb);
5475 SCTP_SOCKET_LOCK(so, 1);
5476 SCTP_TCB_LOCK(stcb);
5477 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5478 #endif
5479 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5480 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5481 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5482 SCTP_SOCKET_UNLOCK(so, 1);
5483 #endif
5484 *offset = length;
5485 return (NULL);
5486 }
5487 sctp_handle_forward_tsn(stcb,
5488 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5489 if (abort_flag) {
5490 *offset = length;
5491 return (NULL);
5492 } else {
5493 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5494 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5495 stcb->asoc.overall_error_count,
5496 0,
5497 SCTP_FROM_SCTP_INPUT,
5498 __LINE__);
5499 }
5500 stcb->asoc.overall_error_count = 0;
5501 }
5502
5503 }
5504 break;
5505 case SCTP_STREAM_RESET:
5506 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5507 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5508 /* Its not ours */
5509 if (locked_tcb) {
5510 SCTP_TCB_UNLOCK(locked_tcb);
5511 }
5512 *offset = length;
5513 return (NULL);
5514 }
5515 if (stcb->asoc.reconfig_supported == 0) {
5516 goto unknown_chunk;
5517 }
5518 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5519 /* stop processing */
5520 *offset = length;
5521 return (NULL);
5522 }
5523 break;
5524 case SCTP_PACKET_DROPPED:
5525 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5526 /* re-get it all please */
5527 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5528 /* Its not ours */
5529 if (locked_tcb) {
5530 SCTP_TCB_UNLOCK(locked_tcb);
5531 }
5532 *offset = length;
5533 return (NULL);
5534 }
5535 if (ch && (stcb) && netp && (*netp)) {
5536 if (stcb->asoc.pktdrop_supported == 0) {
5537 goto unknown_chunk;
5538 }
5539 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5540 stcb, *netp,
5541 min(chk_length, (sizeof(chunk_buf) - 4)));
5542
5543 }
5544 break;
5545 case SCTP_AUTHENTICATION:
5546 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5547 if (stcb == NULL) {
5548 /* save the first AUTH for later processing */
5549 if (auth_skipped == 0) {
5550 auth_offset = *offset;
5551 auth_len = chk_length;
5552 auth_skipped = 1;
5553 }
5554 /* skip this chunk (temporarily) */
5555 goto next_chunk;
5556 }
5557 if (stcb->asoc.auth_supported == 0) {
5558 goto unknown_chunk;
5559 }
5560 if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5561 (chk_length > (sizeof(struct sctp_auth_chunk) +
5562 SCTP_AUTH_DIGEST_LEN_MAX))) {
5563 /* Its not ours */
5564 if (locked_tcb) {
5565 SCTP_TCB_UNLOCK(locked_tcb);
5566 }
5567 *offset = length;
5568 return (NULL);
5569 }
5570 if (got_auth == 1) {
5571 /* skip this chunk... it's already auth'd */
5572 goto next_chunk;
5573 }
5574 got_auth = 1;
5575 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5576 m, *offset)) {
5577 /* auth HMAC failed so dump the packet */
5578 *offset = length;
5579 return (stcb);
5580 } else {
5581 /* remaining chunks are HMAC checked */
5582 stcb->asoc.authenticated = 1;
5583 }
5584 break;
5585
5586 default:
5587 unknown_chunk:
5588 /* it's an unknown chunk! */
5589 if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5590 struct sctp_gen_error_cause *cause;
5591 int len;
5592
5593 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5594 0, M_NOWAIT, 1, MT_DATA);
5595 if (op_err != NULL) {
5596 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5597 cause = mtod(op_err, struct sctp_gen_error_cause *);
5598 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5599 cause->length = htons(len + sizeof(struct sctp_gen_error_cause));
5600 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5601 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5602 if (SCTP_BUF_NEXT(op_err) != NULL) {
5603 #ifdef SCTP_MBUF_LOGGING
5604 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5605 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5606 }
5607 #endif
5608 sctp_queue_op_err(stcb, op_err);
5609 } else {
5610 sctp_m_freem(op_err);
5611 }
5612 }
5613 }
5614 if ((ch->chunk_type & 0x80) == 0) {
5615 /* discard this packet */
5616 *offset = length;
5617 return (stcb);
5618 } /* else skip this bad chunk and continue... */
5619 break;
5620 } /* switch (ch->chunk_type) */
5621
5622
5623 next_chunk:
5624 /* get the next chunk */
5625 *offset += SCTP_SIZE32(chk_length);
5626 if (*offset >= length) {
5627 /* no more data left in the mbuf chain */
5628 break;
5629 }
5630 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5631 sizeof(struct sctp_chunkhdr), chunk_buf);
5632 if (ch == NULL) {
5633 if (locked_tcb) {
5634 SCTP_TCB_UNLOCK(locked_tcb);
5635 }
5636 *offset = length;
5637 return (NULL);
5638 }
5639 } /* while */
5640
5641 if (asconf_cnt > 0 && stcb != NULL) {
5642 sctp_send_asconf_ack(stcb);
5643 }
5644 return (stcb);
5645 }
5646
5647
5648 /*
5649 * common input chunk processing (v4 and v6)
5650 */
5651 void
5652 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5653 struct sockaddr *src, struct sockaddr *dst,
5654 struct sctphdr *sh, struct sctp_chunkhdr *ch,
5655 #if !defined(SCTP_WITH_NO_CSUM)
5656 uint8_t compute_crc,
5657 #endif
5658 uint8_t ecn_bits,
5659 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5660 uint32_t vrf_id, uint16_t port)
5661 {
5662 uint32_t high_tsn;
5663 int fwd_tsn_seen = 0, data_processed = 0;
5664 struct mbuf *m = *mm, *op_err;
5665 char msg[SCTP_DIAG_INFO_LEN];
5666 int un_sent;
5667 int cnt_ctrl_ready = 0;
5668 struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5669 struct sctp_tcb *stcb = NULL;
5670 struct sctp_nets *net = NULL;
5671
5672 SCTP_STAT_INCR(sctps_recvdatagrams);
5673 #ifdef SCTP_AUDITING_ENABLED
5674 sctp_audit_log(0xE0, 1);
5675 sctp_auditing(0, inp, stcb, net);
5676 #endif
5677 #if !defined(SCTP_WITH_NO_CSUM)
5678 if (compute_crc != 0) {
5679 uint32_t check, calc_check;
5680
5681 check = sh->checksum;
5682 sh->checksum = 0;
5683 calc_check = sctp_calculate_cksum(m, iphlen);
5684 sh->checksum = check;
5685 if (calc_check != check) {
5686 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n",
5687 calc_check, check, (void *)m, length, iphlen);
5688 stcb = sctp_findassociation_addr(m, offset, src, dst,
5689 sh, ch, &inp, &net, vrf_id);
5690 #if defined(INET) || defined(INET6)
5691 if ((ch->chunk_type != SCTP_INITIATION) &&
5692 (net != NULL) && (net->port != port)) {
5693 if (net->port == 0) {
5694 /* UDP encapsulation turned on. */
5695 net->mtu -= sizeof(struct udphdr);
5696 if (stcb->asoc.smallest_mtu > net->mtu) {
5697 sctp_pathmtu_adjustment(stcb, net->mtu);
5698 }
5699 } else if (port == 0) {
5700 /* UDP encapsulation turned off. */
5701 net->mtu += sizeof(struct udphdr);
5702 /* XXX Update smallest_mtu */
5703 }
5704 net->port = port;
5705 }
5706 #endif
5707 if (net != NULL) {
5708 net->flowtype = mflowtype;
5709 net->flowid = mflowid;
5710 }
5711 if ((inp != NULL) && (stcb != NULL)) {
5712 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5713 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5714 } else if ((inp != NULL) && (stcb == NULL)) {
5715 inp_decr = inp;
5716 }
5717 SCTP_STAT_INCR(sctps_badsum);
5718 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5719 goto out;
5720 }
5721 }
5722 #endif
5723 /* Destination port of 0 is illegal, based on RFC4960. */
5724 if (sh->dest_port == 0) {
5725 SCTP_STAT_INCR(sctps_hdrops);
5726 goto out;
5727 }
5728 stcb = sctp_findassociation_addr(m, offset, src, dst,
5729 sh, ch, &inp, &net, vrf_id);
5730 #if defined(INET) || defined(INET6)
5731 if ((ch->chunk_type != SCTP_INITIATION) &&
5732 (net != NULL) && (net->port != port)) {
5733 if (net->port == 0) {
5734 /* UDP encapsulation turned on. */
5735 net->mtu -= sizeof(struct udphdr);
5736 if (stcb->asoc.smallest_mtu > net->mtu) {
5737 sctp_pathmtu_adjustment(stcb, net->mtu);
5738 }
5739 } else if (port == 0) {
5740 /* UDP encapsulation turned off. */
5741 net->mtu += sizeof(struct udphdr);
5742 /* XXX Update smallest_mtu */
5743 }
5744 net->port = port;
5745 }
5746 #endif
5747 if (net != NULL) {
5748 net->flowtype = mflowtype;
5749 net->flowid = mflowid;
5750 }
5751 if (inp == NULL) {
5752 SCTP_STAT_INCR(sctps_noport);
5753 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5754 goto out;
5755 }
5756 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5757 sctp_send_shutdown_complete2(src, dst, sh,
5758 mflowtype, mflowid, fibnum,
5759 vrf_id, port);
5760 goto out;
5761 }
5762 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5763 goto out;
5764 }
5765 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5766 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5767 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5768 (ch->chunk_type != SCTP_INIT))) {
5769 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5770 "Out of the blue");
5771 sctp_send_abort(m, iphlen, src, dst,
5772 sh, 0, op_err,
5773 mflowtype, mflowid, fibnum,
5774 vrf_id, port);
5775 }
5776 }
5777 goto out;
5778 } else if (stcb == NULL) {
5779 inp_decr = inp;
5780 }
5781 #ifdef IPSEC
5782 /*-
5783 * I very much doubt any of the IPSEC stuff will work but I have no
5784 * idea, so I will leave it in place.
5785 */
5786 if (inp != NULL) {
5787 switch (dst->sa_family) {
5788 #ifdef INET
5789 case AF_INET:
5790 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5791 IPSECSTAT_INC(ips_in_polvio);
5792 SCTP_STAT_INCR(sctps_hdrops);
5793 goto out;
5794 }
5795 break;
5796 #endif
5797 #ifdef INET6
5798 case AF_INET6:
5799 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5800 IPSEC6STAT_INC(ips_in_polvio);
5801 SCTP_STAT_INCR(sctps_hdrops);
5802 goto out;
5803 }
5804 break;
5805 #endif
5806 default:
5807 break;
5808 }
5809 }
5810 #endif
5811 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5812 (void *)m, iphlen, offset, length, (void *)stcb);
5813 if (stcb) {
5814 /* always clear this before beginning a packet */
5815 stcb->asoc.authenticated = 0;
5816 stcb->asoc.seen_a_sack_this_pkt = 0;
5817 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5818 (void *)stcb, stcb->asoc.state);
5819
5820 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5821 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5822 /*-
5823 * If we hit here, we had a ref count
5824 * up when the assoc was aborted and the
5825 * timer is clearing out the assoc, we should
5826 * NOT respond to any packet.. its OOTB.
5827 */
5828 SCTP_TCB_UNLOCK(stcb);
5829 stcb = NULL;
5830 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5831 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5832 msg);
5833 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5834 mflowtype, mflowid, inp->fibnum,
5835 vrf_id, port);
5836 goto out;
5837 }
5838 }
5839 if (IS_SCTP_CONTROL(ch)) {
5840 /* process the control portion of the SCTP packet */
5841 /* sa_ignore NO_NULL_CHK */
5842 stcb = sctp_process_control(m, iphlen, &offset, length,
5843 src, dst, sh, ch,
5844 inp, stcb, &net, &fwd_tsn_seen,
5845 mflowtype, mflowid, fibnum,
5846 vrf_id, port);
5847 if (stcb) {
5848 /*
5849 * This covers us if the cookie-echo was there and
5850 * it changes our INP.
5851 */
5852 inp = stcb->sctp_ep;
5853 #if defined(INET) || defined(INET6)
5854 if ((ch->chunk_type != SCTP_INITIATION) &&
5855 (net != NULL) && (net->port != port)) {
5856 if (net->port == 0) {
5857 /* UDP encapsulation turned on. */
5858 net->mtu -= sizeof(struct udphdr);
5859 if (stcb->asoc.smallest_mtu > net->mtu) {
5860 sctp_pathmtu_adjustment(stcb, net->mtu);
5861 }
5862 } else if (port == 0) {
5863 /* UDP encapsulation turned off. */
5864 net->mtu += sizeof(struct udphdr);
5865 /* XXX Update smallest_mtu */
5866 }
5867 net->port = port;
5868 }
5869 #endif
5870 }
5871 } else {
5872 /*
5873 * no control chunks, so pre-process DATA chunks (these
5874 * checks are taken care of by control processing)
5875 */
5876
5877 /*
5878 * if DATA only packet, and auth is required, then punt...
5879 * can't have authenticated without any AUTH (control)
5880 * chunks
5881 */
5882 if ((stcb != NULL) &&
5883 (stcb->asoc.auth_supported == 1) &&
5884 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5885 /* "silently" ignore */
5886 SCTP_STAT_INCR(sctps_recvauthmissing);
5887 goto out;
5888 }
5889 if (stcb == NULL) {
5890 /* out of the blue DATA chunk */
5891 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5892 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5893 msg);
5894 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5895 mflowtype, mflowid, fibnum,
5896 vrf_id, port);
5897 goto out;
5898 }
5899 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5900 /* v_tag mismatch! */
5901 SCTP_STAT_INCR(sctps_badvtag);
5902 goto out;
5903 }
5904 }
5905
5906 if (stcb == NULL) {
5907 /*
5908 * no valid TCB for this packet, or we found it's a bad
5909 * packet while processing control, or we're done with this
5910 * packet (done or skip rest of data), so we drop it...
5911 */
5912 goto out;
5913 }
5914 /*
5915 * DATA chunk processing
5916 */
5917 /* plow through the data chunks while length > offset */
5918
5919 /*
5920 * Rest should be DATA only. Check authentication state if AUTH for
5921 * DATA is required.
5922 */
5923 if ((length > offset) &&
5924 (stcb != NULL) &&
5925 (stcb->asoc.auth_supported == 1) &&
5926 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5927 !stcb->asoc.authenticated) {
5928 /* "silently" ignore */
5929 SCTP_STAT_INCR(sctps_recvauthmissing);
5930 SCTPDBG(SCTP_DEBUG_AUTH1,
5931 "Data chunk requires AUTH, skipped\n");
5932 goto trigger_send;
5933 }
5934 if (length > offset) {
5935 int retval;
5936
5937 /*
5938 * First check to make sure our state is correct. We would
5939 * not get here unless we really did have a tag, so we don't
5940 * abort if this happens, just dump the chunk silently.
5941 */
5942 switch (SCTP_GET_STATE(&stcb->asoc)) {
5943 case SCTP_STATE_COOKIE_ECHOED:
5944 /*
5945 * we consider data with valid tags in this state
5946 * shows us the cookie-ack was lost. Imply it was
5947 * there.
5948 */
5949 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5950 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5951 stcb->asoc.overall_error_count,
5952 0,
5953 SCTP_FROM_SCTP_INPUT,
5954 __LINE__);
5955 }
5956 stcb->asoc.overall_error_count = 0;
5957 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5958 break;
5959 case SCTP_STATE_COOKIE_WAIT:
5960 /*
5961 * We consider OOTB any data sent during asoc setup.
5962 */
5963 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5964 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5965 msg);
5966 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5967 mflowtype, mflowid, inp->fibnum,
5968 vrf_id, port);
5969 goto out;
5970 /* sa_ignore NOTREACHED */
5971 break;
5972 case SCTP_STATE_EMPTY: /* should not happen */
5973 case SCTP_STATE_INUSE: /* should not happen */
5974 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */
5975 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5976 default:
5977 goto out;
5978 /* sa_ignore NOTREACHED */
5979 break;
5980 case SCTP_STATE_OPEN:
5981 case SCTP_STATE_SHUTDOWN_SENT:
5982 break;
5983 }
5984 /* plow through the data chunks while length > offset */
5985 retval = sctp_process_data(mm, iphlen, &offset, length,
5986 inp, stcb, net, &high_tsn);
5987 if (retval == 2) {
5988 /*
5989 * The association aborted, NO UNLOCK needed since
5990 * the association is destroyed.
5991 */
5992 stcb = NULL;
5993 goto out;
5994 }
5995 data_processed = 1;
5996 /*
5997 * Anything important needs to have been m_copy'ed in
5998 * process_data
5999 */
6000 }
6001 /* take care of ecn */
6002 if ((data_processed == 1) &&
6003 (stcb->asoc.ecn_supported == 1) &&
6004 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
6005 /* Yep, we need to add a ECNE */
6006 sctp_send_ecn_echo(stcb, net, high_tsn);
6007 }
6008 if ((data_processed == 0) && (fwd_tsn_seen)) {
6009 int was_a_gap;
6010 uint32_t highest_tsn;
6011
6012 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
6013 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
6014 } else {
6015 highest_tsn = stcb->asoc.highest_tsn_inside_map;
6016 }
6017 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
6018 stcb->asoc.send_sack = 1;
6019 sctp_sack_check(stcb, was_a_gap);
6020 } else if (fwd_tsn_seen) {
6021 stcb->asoc.send_sack = 1;
6022 }
6023 /* trigger send of any chunks in queue... */
6024 trigger_send:
6025 #ifdef SCTP_AUDITING_ENABLED
6026 sctp_audit_log(0xE0, 2);
6027 sctp_auditing(1, inp, stcb, net);
6028 #endif
6029 SCTPDBG(SCTP_DEBUG_INPUT1,
6030 "Check for chunk output prw:%d tqe:%d tf=%d\n",
6031 stcb->asoc.peers_rwnd,
6032 TAILQ_EMPTY(&stcb->asoc.control_send_queue),
6033 stcb->asoc.total_flight);
6034 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
6035 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
6036 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
6037 }
6038 if (cnt_ctrl_ready || stcb->asoc.trigger_reset ||
6039 ((un_sent) &&
6040 (stcb->asoc.peers_rwnd > 0 ||
6041 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
6042 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
6043 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
6044 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6045 }
6046 #ifdef SCTP_AUDITING_ENABLED
6047 sctp_audit_log(0xE0, 3);
6048 sctp_auditing(2, inp, stcb, net);
6049 #endif
6050 out:
6051 if (stcb != NULL) {
6052 SCTP_TCB_UNLOCK(stcb);
6053 }
6054 if (inp_decr != NULL) {
6055 /* reduce ref-count */
6056 SCTP_INP_WLOCK(inp_decr);
6057 SCTP_INP_DECR_REF(inp_decr);
6058 SCTP_INP_WUNLOCK(inp_decr);
6059 }
6060 return;
6061 }
6062
6063 #if 0
6064 static void
6065 sctp_print_mbuf_chain(struct mbuf *m)
6066 {
6067 for (; m; m = SCTP_BUF_NEXT(m)) {
6068 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
6069 if (SCTP_BUF_IS_EXTENDED(m))
6070 SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
6071 }
6072 }
6073
6074 #endif
6075
6076 #ifdef INET
6077 void
6078 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6079 {
6080 struct mbuf *m;
6081 int iphlen;
6082 uint32_t vrf_id = 0;
6083 uint8_t ecn_bits;
6084 struct sockaddr_in src, dst;
6085 struct ip *ip;
6086 struct sctphdr *sh;
6087 struct sctp_chunkhdr *ch;
6088 int length, offset;
6089
6090 #if !defined(SCTP_WITH_NO_CSUM)
6091 uint8_t compute_crc;
6092
6093 #endif
6094 uint32_t mflowid;
6095 uint8_t mflowtype;
6096 uint16_t fibnum;
6097
6098 iphlen = off;
6099 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6100 SCTP_RELEASE_PKT(i_pak);
6101 return;
6102 }
6103 m = SCTP_HEADER_TO_CHAIN(i_pak);
6104 #ifdef SCTP_MBUF_LOGGING
6105 /* Log in any input mbufs */
6106 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6107 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6108 }
6109 #endif
6110 #ifdef SCTP_PACKET_LOGGING
6111 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6112 sctp_packet_log(m);
6113 }
6114 #endif
6115 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6116 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6117 m->m_pkthdr.len,
6118 if_name(m->m_pkthdr.rcvif),
6119 (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6120 mflowid = m->m_pkthdr.flowid;
6121 mflowtype = M_HASHTYPE_GET(m);
6122 fibnum = M_GETFIB(m);
6123 SCTP_STAT_INCR(sctps_recvpackets);
6124 SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6125 /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6126 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6127 if (SCTP_BUF_LEN(m) < offset) {
6128 if ((m = m_pullup(m, offset)) == NULL) {
6129 SCTP_STAT_INCR(sctps_hdrops);
6130 return;
6131 }
6132 }
6133 ip = mtod(m, struct ip *);
6134 sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6135 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6136 offset -= sizeof(struct sctp_chunkhdr);
6137 memset(&src, 0, sizeof(struct sockaddr_in));
6138 src.sin_family = AF_INET;
6139 src.sin_len = sizeof(struct sockaddr_in);
6140 src.sin_port = sh->src_port;
6141 src.sin_addr = ip->ip_src;
6142 memset(&dst, 0, sizeof(struct sockaddr_in));
6143 dst.sin_family = AF_INET;
6144 dst.sin_len = sizeof(struct sockaddr_in);
6145 dst.sin_port = sh->dest_port;
6146 dst.sin_addr = ip->ip_dst;
6147 length = ntohs(ip->ip_len);
6148 /* Validate mbuf chain length with IP payload length. */
6149 if (SCTP_HEADER_LEN(m) != length) {
6150 SCTPDBG(SCTP_DEBUG_INPUT1,
6151 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6152 SCTP_STAT_INCR(sctps_hdrops);
6153 goto out;
6154 }
6155 /* SCTP does not allow broadcasts or multicasts */
6156 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6157 goto out;
6158 }
6159 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6160 goto out;
6161 }
6162 ecn_bits = ip->ip_tos;
6163 #if defined(SCTP_WITH_NO_CSUM)
6164 SCTP_STAT_INCR(sctps_recvnocrc);
6165 #else
6166 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6167 SCTP_STAT_INCR(sctps_recvhwcrc);
6168 compute_crc = 0;
6169 } else {
6170 SCTP_STAT_INCR(sctps_recvswcrc);
6171 compute_crc = 1;
6172 }
6173 #endif
6174 sctp_common_input_processing(&m, iphlen, offset, length,
6175 (struct sockaddr *)&src,
6176 (struct sockaddr *)&dst,
6177 sh, ch,
6178 #if !defined(SCTP_WITH_NO_CSUM)
6179 compute_crc,
6180 #endif
6181 ecn_bits,
6182 mflowtype, mflowid, fibnum,
6183 vrf_id, port);
6184 out:
6185 if (m) {
6186 sctp_m_freem(m);
6187 }
6188 return;
6189 }
6190
6191 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6192 extern int *sctp_cpuarry;
6193
6194 #endif
6195
6196 void
6197 sctp_input(struct mbuf *m, int off)
6198 {
6199 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6200 struct ip *ip;
6201 struct sctphdr *sh;
6202 int offset;
6203 int cpu_to_use;
6204 uint32_t flowid, tag;
6205
6206 if (mp_ncpus > 1) {
6207 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6208 flowid = m->m_pkthdr.flowid;
6209 } else {
6210 /*
6211 * No flow id built by lower layers fix it so we
6212 * create one.
6213 */
6214 offset = off + sizeof(struct sctphdr);
6215 if (SCTP_BUF_LEN(m) < offset) {
6216 if ((m = m_pullup(m, offset)) == NULL) {
6217 SCTP_STAT_INCR(sctps_hdrops);
6218 return;
6219 }
6220 }
6221 ip = mtod(m, struct ip *);
6222 sh = (struct sctphdr *)((caddr_t)ip + off);
6223 tag = htonl(sh->v_tag);
6224 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6225 m->m_pkthdr.flowid = flowid;
6226 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6227 }
6228 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6229 sctp_queue_to_mcore(m, off, cpu_to_use);
6230 return;
6231 }
6232 #endif
6233 sctp_input_with_port(m, off, 0);
6234 }
6235
6236 #endif
Cache object: f1df9bcdc3f174f8fadecdde3fae4345
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