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comparison: netwerk/sctp/src/netinet/sctp_input.c

netwerk/sctp/src/netinet/sctp_input.c

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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 #ifdef __FreeBSD__
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 262252 2014-02-20 20:14:43Z tuexen $");
36 #endif
37
38 #include <netinet/sctp_os.h>
39 #include <netinet/sctp_var.h>
40 #include <netinet/sctp_sysctl.h>
41 #include <netinet/sctp_pcb.h>
42 #include <netinet/sctp_header.h>
43 #include <netinet/sctputil.h>
44 #include <netinet/sctp_output.h>
45 #include <netinet/sctp_input.h>
46 #include <netinet/sctp_auth.h>
47 #include <netinet/sctp_indata.h>
48 #include <netinet/sctp_asconf.h>
49 #include <netinet/sctp_bsd_addr.h>
50 #include <netinet/sctp_timer.h>
51 #include <netinet/sctp_crc32.h>
52 #if !defined(__Userspace_os_Windows)
53 #include <netinet/udp.h>
54 #endif
55 #if defined(__FreeBSD__)
56 #include <sys/smp.h>
57 #endif
58
59 #if defined(__APPLE__)
60 #define APPLE_FILE_NO 2
61 #endif
62
63
64 static void
65 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
66 {
67 struct sctp_nets *net;
68
69 /* This now not only stops all cookie timers
70 * it also stops any INIT timers as well. This
71 * will make sure that the timers are stopped in
72 * all collision cases.
73 */
74 SCTP_TCB_LOCK_ASSERT(stcb);
75 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
76 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
77 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
78 stcb->sctp_ep,
79 stcb,
80 net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_1);
81 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
82 sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
83 stcb->sctp_ep,
84 stcb,
85 net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_2);
86 }
87 }
88 }
89
90 /* INIT handler */
91 static void
92 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
93 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
94 struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
95 struct sctp_tcb *stcb, int *abort_no_unlock,
96 #if defined(__FreeBSD__)
97 uint8_t use_mflowid, uint32_t mflowid,
98 #endif
99 uint32_t vrf_id, uint16_t port)
100 {
101 struct sctp_init *init;
102 struct mbuf *op_err;
103
104 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
105 (void *)stcb);
106 if (stcb == NULL) {
107 SCTP_INP_RLOCK(inp);
108 }
109 /* validate length */
110 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
111 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
112 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
113 #if defined(__FreeBSD__)
114 use_mflowid, mflowid,
115 #endif
116 vrf_id, port);
117 if (stcb)
118 *abort_no_unlock = 1;
119 goto outnow;
120 }
121 /* validate parameters */
122 init = &cp->init;
123 if (init->initiate_tag == 0) {
124 /* protocol error... send abort */
125 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
126 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
127 #if defined(__FreeBSD__)
128 use_mflowid, mflowid,
129 #endif
130 vrf_id, port);
131 if (stcb)
132 *abort_no_unlock = 1;
133 goto outnow;
134 }
135 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
136 /* invalid parameter... send abort */
137 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
138 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
139 #if defined(__FreeBSD__)
140 use_mflowid, mflowid,
141 #endif
142 vrf_id, port);
143 if (stcb)
144 *abort_no_unlock = 1;
145 goto outnow;
146 }
147 if (init->num_inbound_streams == 0) {
148 /* protocol error... send abort */
149 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
150 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
151 #if defined(__FreeBSD__)
152 use_mflowid, mflowid,
153 #endif
154 vrf_id, port);
155 if (stcb)
156 *abort_no_unlock = 1;
157 goto outnow;
158 }
159 if (init->num_outbound_streams == 0) {
160 /* protocol error... send abort */
161 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
162 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
163 #if defined(__FreeBSD__)
164 use_mflowid, mflowid,
165 #endif
166 vrf_id, port);
167 if (stcb)
168 *abort_no_unlock = 1;
169 goto outnow;
170 }
171 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
172 offset + ntohs(cp->ch.chunk_length))) {
173 /* auth parameter(s) error... send abort */
174 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, NULL,
175 #if defined(__FreeBSD__)
176 use_mflowid, mflowid,
177 #endif
178 vrf_id, port);
179 if (stcb)
180 *abort_no_unlock = 1;
181 goto outnow;
182 }
183 /* We are only accepting if we have a socket with positive so_qlimit.*/
184 if ((stcb == NULL) &&
185 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
186 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
187 (inp->sctp_socket == NULL) ||
188 (inp->sctp_socket->so_qlimit == 0))) {
189 /*
190 * FIX ME ?? What about TCP model and we have a
191 * match/restart case? Actually no fix is needed.
192 * the lookup will always find the existing assoc so stcb
193 * would not be NULL. It may be questionable to do this
194 * since we COULD just send back the INIT-ACK and hope that
195 * the app did accept()'s by the time the COOKIE was sent. But
196 * there is a price to pay for COOKIE generation and I don't
197 * want to pay it on the chance that the app will actually do
198 * some accepts(). The App just looses and should NOT be in
199 * this state :-)
200 */
201 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
202 sctp_send_abort(m, iphlen, src, dst, sh, 0, NULL,
203 #if defined(__FreeBSD__)
204 use_mflowid, mflowid,
205 #endif
206 vrf_id, port);
207 }
208 goto outnow;
209 }
210 if ((stcb != NULL) &&
211 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
212 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
213 sctp_send_shutdown_ack(stcb, NULL);
214 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
215 } else {
216 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
217 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst,
218 sh, cp,
219 #if defined(__FreeBSD__)
220 use_mflowid, mflowid,
221 #endif
222 vrf_id, port,
223 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
224 }
225 outnow:
226 if (stcb == NULL) {
227 SCTP_INP_RUNLOCK(inp);
228 }
229 }
230
231 /*
232 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
233 */
234
235 int
236 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
237 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
238 SCTP_UNUSED
239 #endif
240 )
241 {
242 int unsent_data = 0;
243 unsigned int i;
244 struct sctp_stream_queue_pending *sp;
245 struct sctp_association *asoc;
246
247 /* This function returns the number of streams that have
248 * true unsent data on them. Note that as it looks through
249 * it will clean up any places that have old data that
250 * has been sent but left at top of stream queue.
251 */
252 asoc = &stcb->asoc;
253 SCTP_TCB_SEND_LOCK(stcb);
254 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
255 /* Check to see if some data queued */
256 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
257 /*sa_ignore FREED_MEMORY*/
258 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
259 if (sp == NULL) {
260 continue;
261 }
262 if ((sp->msg_is_complete) &&
263 (sp->length == 0) &&
264 (sp->sender_all_done)) {
265 /* We are doing differed cleanup. Last
266 * time through when we took all the data
267 * the sender_all_done was not set.
268 */
269 if (sp->put_last_out == 0) {
270 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
271 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
272 sp->sender_all_done,
273 sp->length,
274 sp->msg_is_complete,
275 sp->put_last_out);
276 }
277 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
278 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
279 if (sp->net) {
280 sctp_free_remote_addr(sp->net);
281 sp->net = NULL;
282 }
283 if (sp->data) {
284 sctp_m_freem(sp->data);
285 sp->data = NULL;
286 }
287 sctp_free_a_strmoq(stcb, sp, so_locked);
288 } else {
289 unsent_data++;
290 break;
291 }
292 }
293 }
294 SCTP_TCB_SEND_UNLOCK(stcb);
295 return (unsent_data);
296 }
297
298 static int
299 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
300 {
301 struct sctp_init *init;
302 struct sctp_association *asoc;
303 struct sctp_nets *lnet;
304 unsigned int i;
305
306 init = &cp->init;
307 asoc = &stcb->asoc;
308 /* save off parameters */
309 asoc->peer_vtag = ntohl(init->initiate_tag);
310 asoc->peers_rwnd = ntohl(init->a_rwnd);
311 /* init tsn's */
312 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
313
314 if (!TAILQ_EMPTY(&asoc->nets)) {
315 /* update any ssthresh's that may have a default */
316 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
317 lnet->ssthresh = asoc->peers_rwnd;
318 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE|SCTP_CWND_LOGGING_ENABLE)) {
319 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
320 }
321
322 }
323 }
324 SCTP_TCB_SEND_LOCK(stcb);
325 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
326 unsigned int newcnt;
327 struct sctp_stream_out *outs;
328 struct sctp_stream_queue_pending *sp, *nsp;
329 struct sctp_tmit_chunk *chk, *nchk;
330
331 /* abandon the upper streams */
332 newcnt = ntohs(init->num_inbound_streams);
333 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
334 if (chk->rec.data.stream_number >= newcnt) {
335 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
336 asoc->send_queue_cnt--;
337 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
338 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
339 #ifdef INVARIANTS
340 } else {
341 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
342 #endif
343 }
344 if (chk->data != NULL) {
345 sctp_free_bufspace(stcb, asoc, chk, 1);
346 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
347 0, chk, SCTP_SO_NOT_LOCKED);
348 if (chk->data) {
349 sctp_m_freem(chk->data);
350 chk->data = NULL;
351 }
352 }
353 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
354 /*sa_ignore FREED_MEMORY*/
355 }
356 }
357 if (asoc->strmout) {
358 for (i = newcnt; i < asoc->pre_open_streams; i++) {
359 outs = &asoc->strmout[i];
360 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
361 TAILQ_REMOVE(&outs->outqueue, sp, next);
362 asoc->stream_queue_cnt--;
363 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
364 stcb, 0, sp, SCTP_SO_NOT_LOCKED);
365 if (sp->data) {
366 sctp_m_freem(sp->data);
367 sp->data = NULL;
368 }
369 if (sp->net) {
370 sctp_free_remote_addr(sp->net);
371 sp->net = NULL;
372 }
373 /* Free the chunk */
374 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
375 /*sa_ignore FREED_MEMORY*/
376 }
377 }
378 }
379 /* cut back the count */
380 asoc->pre_open_streams = newcnt;
381 }
382 SCTP_TCB_SEND_UNLOCK(stcb);
383 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
384
385 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
386 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
387 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
388 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
389 }
390 /* This is the next one we expect */
391 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
392
393 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
394 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
395
396 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
397 /* open the requested streams */
398
399 if (asoc->strmin != NULL) {
400 /* Free the old ones */
401 struct sctp_queued_to_read *ctl, *nctl;
402
403 for (i = 0; i < asoc->streamincnt; i++) {
404 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
405 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
406 sctp_free_remote_addr(ctl->whoFrom);
407 ctl->whoFrom = NULL;
408 sctp_m_freem(ctl->data);
409 ctl->data = NULL;
410 sctp_free_a_readq(stcb, ctl);
411 }
412 }
413 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
414 }
415 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
416 asoc->streamincnt = ntohs(init->num_outbound_streams);
417 } else {
418 asoc->streamincnt = asoc->max_inbound_streams;
419 }
420 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
421 sizeof(struct sctp_stream_in), SCTP_M_STRMI);
422 if (asoc->strmin == NULL) {
423 /* we didn't get memory for the streams! */
424 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
425 return (-1);
426 }
427 for (i = 0; i < asoc->streamincnt; i++) {
428 asoc->strmin[i].stream_no = i;
429 asoc->strmin[i].last_sequence_delivered = 0xffff;
430 TAILQ_INIT(&asoc->strmin[i].inqueue);
431 asoc->strmin[i].delivery_started = 0;
432 }
433 /*
434 * load_address_from_init will put the addresses into the
435 * association when the COOKIE is processed or the INIT-ACK is
436 * processed. Both types of COOKIE's existing and new call this
437 * routine. It will remove addresses that are no longer in the
438 * association (for the restarting case where addresses are
439 * removed). Up front when the INIT arrives we will discard it if it
440 * is a restart and new addresses have been added.
441 */
442 /* sa_ignore MEMLEAK */
443 return (0);
444 }
445
446 /*
447 * INIT-ACK message processing/consumption returns value < 0 on error
448 */
449 static int
450 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
451 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
452 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
453 struct sctp_nets *net, int *abort_no_unlock,
454 #if defined(__FreeBSD__)
455 uint8_t use_mflowid, uint32_t mflowid,
456 #endif
457 uint32_t vrf_id)
458 {
459 struct sctp_association *asoc;
460 struct mbuf *op_err;
461 int retval, abort_flag;
462 uint32_t initack_limit;
463 int nat_friendly = 0;
464
465 /* First verify that we have no illegal param's */
466 abort_flag = 0;
467
468 op_err = sctp_arethere_unrecognized_parameters(m,
469 (offset + sizeof(struct sctp_init_chunk)),
470 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
471 if (abort_flag) {
472 /* Send an abort and notify peer */
473 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
474 *abort_no_unlock = 1;
475 return (-1);
476 }
477 asoc = &stcb->asoc;
478 asoc->peer_supports_nat = (uint8_t)nat_friendly;
479 /* process the peer's parameters in the INIT-ACK */
480 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
481 if (retval < 0) {
482 return (retval);
483 }
484 initack_limit = offset + ntohs(cp->ch.chunk_length);
485 /* load all addresses */
486 if ((retval = sctp_load_addresses_from_init(stcb, m,
487 (offset + sizeof(struct sctp_init_chunk)), initack_limit,
488 src, dst, NULL))) {
489 /* Huh, we should abort */
490 SCTPDBG(SCTP_DEBUG_INPUT1,
491 "Load addresses from INIT causes an abort %d\n",
492 retval);
493 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
494 src, dst, sh, NULL,
495 #if defined(__FreeBSD__)
496 use_mflowid, mflowid,
497 #endif
498 vrf_id, net->port);
499 *abort_no_unlock = 1;
500 return (-1);
501 }
502 /* if the peer doesn't support asconf, flush the asconf queue */
503 if (asoc->peer_supports_asconf == 0) {
504 struct sctp_asconf_addr *param, *nparam;
505
506 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
507 TAILQ_REMOVE(&asoc->asconf_queue, param, next);
508 SCTP_FREE(param, SCTP_M_ASC_ADDR);
509 }
510 }
511
512 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
513 stcb->asoc.local_hmacs);
514 if (op_err) {
515 sctp_queue_op_err(stcb, op_err);
516 /* queuing will steal away the mbuf chain to the out queue */
517 op_err = NULL;
518 }
519 /* extract the cookie and queue it to "echo" it back... */
520 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
521 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
522 stcb->asoc.overall_error_count,
523 0,
524 SCTP_FROM_SCTP_INPUT,
525 __LINE__);
526 }
527 stcb->asoc.overall_error_count = 0;
528 net->error_count = 0;
529
530 /*
531 * Cancel the INIT timer, We do this first before queueing the
532 * cookie. We always cancel at the primary to assue that we are
533 * canceling the timer started by the INIT which always goes to the
534 * primary.
535 */
536 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
537 asoc->primary_destination, SCTP_FROM_SCTP_INPUT+SCTP_LOC_4);
538
539 /* calculate the RTO */
540 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
541 SCTP_RTT_FROM_NON_DATA);
542
543 retval = sctp_send_cookie_echo(m, offset, stcb, net);
544 if (retval < 0) {
545 /*
546 * No cookie, we probably should send a op error. But in any
547 * case if there is no cookie in the INIT-ACK, we can
548 * abandon the peer, its broke.
549 */
550 if (retval == -3) {
551 /* We abort with an error of missing mandatory param */
552 op_err =
553 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM);
554 if (op_err) {
555 /*
556 * Expand beyond to include the mandatory
557 * param cookie
558 */
559 struct sctp_inv_mandatory_param *mp;
560
561 SCTP_BUF_LEN(op_err) =
562 sizeof(struct sctp_inv_mandatory_param);
563 mp = mtod(op_err,
564 struct sctp_inv_mandatory_param *);
565 /* Subtract the reserved param */
566 mp->length =
567 htons(sizeof(struct sctp_inv_mandatory_param) - 2);
568 mp->num_param = htonl(1);
569 mp->param = htons(SCTP_STATE_COOKIE);
570 mp->resv = 0;
571 }
572 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
573 src, dst, sh, op_err,
574 #if defined(__FreeBSD__)
575 use_mflowid, mflowid,
576 #endif
577 vrf_id, net->port);
578 *abort_no_unlock = 1;
579 }
580 return (retval);
581 }
582
583 return (0);
584 }
585
586 static void
587 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
588 struct sctp_tcb *stcb, struct sctp_nets *net)
589 {
590 struct sockaddr_storage store;
591 struct sctp_nets *r_net, *f_net;
592 struct timeval tv;
593 int req_prim = 0;
594 uint16_t old_error_counter;
595 #ifdef INET
596 struct sockaddr_in *sin;
597 #endif
598 #ifdef INET6
599 struct sockaddr_in6 *sin6;
600 #endif
601 #if defined(__Userspace__)
602 struct sockaddr_conn *sconn;
603 #endif
604
605 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
606 /* Invalid length */
607 return;
608 }
609
610 memset(&store, 0, sizeof(store));
611 switch (cp->heartbeat.hb_info.addr_family) {
612 #ifdef INET
613 case AF_INET:
614 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
615 sin = (struct sockaddr_in *)&store;
616 sin->sin_family = cp->heartbeat.hb_info.addr_family;
617 #ifdef HAVE_SIN_LEN
618 sin->sin_len = cp->heartbeat.hb_info.addr_len;
619 #endif
620 sin->sin_port = stcb->rport;
621 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
622 sizeof(sin->sin_addr));
623 } else {
624 return;
625 }
626 break;
627 #endif
628 #ifdef INET6
629 case AF_INET6:
630 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
631 sin6 = (struct sockaddr_in6 *)&store;
632 sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
633 #ifdef HAVE_SIN6_LEN
634 sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
635 #endif
636 sin6->sin6_port = stcb->rport;
637 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
638 sizeof(sin6->sin6_addr));
639 } else {
640 return;
641 }
642 break;
643 #endif
644 #if defined(__Userspace__)
645 case AF_CONN:
646 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_conn)) {
647 sconn = (struct sockaddr_conn *)&store;
648 sconn->sconn_family = cp->heartbeat.hb_info.addr_family;
649 #ifdef HAVE_SCONN_LEN
650 sconn->sconn_len = cp->heartbeat.hb_info.addr_len;
651 #endif
652 sconn->sconn_port = stcb->rport;
653 memcpy(&sconn->sconn_addr, cp->heartbeat.hb_info.address,
654 sizeof(sconn->sconn_addr));
655 } else {
656 return;
657 }
658 break;
659 #endif
660 default:
661 return;
662 }
663 r_net = sctp_findnet(stcb, (struct sockaddr *)&store);
664 if (r_net == NULL) {
665 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
666 return;
667 }
668 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
669 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
670 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
671 /*
672 * If the its a HB and it's random value is correct when can
673 * confirm the destination.
674 */
675 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
676 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
677 stcb->asoc.primary_destination = r_net;
678 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
679 f_net = TAILQ_FIRST(&stcb->asoc.nets);
680 if (f_net != r_net) {
681 /* first one on the list is NOT the primary
682 * sctp_cmpaddr() is much more efficent if
683 * the primary is the first on the list, make it
684 * so.
685 */
686 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
687 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
688 }
689 req_prim = 1;
690 }
691 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
692 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
693 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
694 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
695 }
696 old_error_counter = r_net->error_count;
697 r_net->error_count = 0;
698 r_net->hb_responded = 1;
699 tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
700 tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
701 /* Now lets do a RTO with this */
702 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
703 SCTP_RTT_FROM_NON_DATA);
704 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
705 r_net->dest_state |= SCTP_ADDR_REACHABLE;
706 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
707 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
708 }
709 if (r_net->dest_state & SCTP_ADDR_PF) {
710 r_net->dest_state &= ~SCTP_ADDR_PF;
711 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
712 }
713 if (old_error_counter > 0) {
714 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
715 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
716 }
717 if (r_net == stcb->asoc.primary_destination) {
718 if (stcb->asoc.alternate) {
719 /* release the alternate, primary is good */
720 sctp_free_remote_addr(stcb->asoc.alternate);
721 stcb->asoc.alternate = NULL;
722 }
723 }
724 /* Mobility adaptation */
725 if (req_prim) {
726 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
727 SCTP_MOBILITY_BASE) ||
728 sctp_is_mobility_feature_on(stcb->sctp_ep,
729 SCTP_MOBILITY_FASTHANDOFF)) &&
730 sctp_is_mobility_feature_on(stcb->sctp_ep,
731 SCTP_MOBILITY_PRIM_DELETED)) {
732
733 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER+SCTP_LOC_7);
734 if (sctp_is_mobility_feature_on(stcb->sctp_ep,
735 SCTP_MOBILITY_FASTHANDOFF)) {
736 sctp_assoc_immediate_retrans(stcb,
737 stcb->asoc.primary_destination);
738 }
739 if (sctp_is_mobility_feature_on(stcb->sctp_ep,
740 SCTP_MOBILITY_BASE)) {
741 sctp_move_chunks_from_net(stcb,
742 stcb->asoc.deleted_primary);
743 }
744 sctp_delete_prim_timer(stcb->sctp_ep, stcb,
745 stcb->asoc.deleted_primary);
746 }
747 }
748 }
749
750 static int
751 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
752 {
753 /* return 0 means we want you to proceed with the abort
754 * non-zero means no abort processing
755 */
756 struct sctpasochead *head;
757
758 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
759 /* generate a new vtag and send init */
760 LIST_REMOVE(stcb, sctp_asocs);
761 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
762 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
763 /* put it in the bucket in the vtag hash of assoc's for the system */
764 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
765 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
766 return (1);
767 }
768 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
769 /* treat like a case where the cookie expired i.e.:
770 * - dump current cookie.
771 * - generate a new vtag.
772 * - resend init.
773 */
774 /* generate a new vtag and send init */
775 LIST_REMOVE(stcb, sctp_asocs);
776 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
777 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
778 sctp_stop_all_cookie_timers(stcb);
779 sctp_toss_old_cookies(stcb, &stcb->asoc);
780 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
781 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
782 /* put it in the bucket in the vtag hash of assoc's for the system */
783 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
784 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
785 return (1);
786 }
787 return (0);
788 }
789
790 static int
791 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
792 struct sctp_nets *net)
793
794 {
795 /* return 0 means we want you to proceed with the abort
796 * non-zero means no abort processing
797 */
798 if (stcb->asoc.peer_supports_auth == 0) {
799 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
800 return (0);
801 }
802 sctp_asconf_send_nat_state_update(stcb, net);
803 return (1);
804 }
805
806
807 static void
808 sctp_handle_abort(struct sctp_abort_chunk *abort,
809 struct sctp_tcb *stcb, struct sctp_nets *net)
810 {
811 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
812 struct socket *so;
813 #endif
814 uint16_t len;
815 uint16_t error;
816
817 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
818 if (stcb == NULL)
819 return;
820
821 len = ntohs(abort->ch.chunk_length);
822 if (len > sizeof (struct sctp_chunkhdr)) {
823 /* Need to check the cause codes for our
824 * two magic nat aborts which don't kill the assoc
825 * necessarily.
826 */
827 struct sctp_missing_nat_state *natc;
828
829 natc = (struct sctp_missing_nat_state *)(abort + 1);
830 error = ntohs(natc->cause);
831 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
832 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
833 abort->ch.chunk_flags);
834 if (sctp_handle_nat_colliding_state(stcb)) {
835 return;
836 }
837 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
838 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
839 abort->ch.chunk_flags);
840 if (sctp_handle_nat_missing_state(stcb, net)) {
841 return;
842 }
843 }
844 } else {
845 error = 0;
846 }
847 /* stop any receive timers */
848 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_6);
849 /* notify user of the abort and clean up... */
850 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
851 /* free the tcb */
852 SCTP_STAT_INCR_COUNTER32(sctps_aborted);
853 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
854 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
855 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
856 }
857 #ifdef SCTP_ASOCLOG_OF_TSNS
858 sctp_print_out_track_log(stcb);
859 #endif
860 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
861 so = SCTP_INP_SO(stcb->sctp_ep);
862 atomic_add_int(&stcb->asoc.refcnt, 1);
863 SCTP_TCB_UNLOCK(stcb);
864 SCTP_SOCKET_LOCK(so, 1);
865 SCTP_TCB_LOCK(stcb);
866 atomic_subtract_int(&stcb->asoc.refcnt, 1);
867 #endif
868 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
869 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
870 SCTP_FROM_SCTP_INPUT+SCTP_LOC_6);
871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
872 SCTP_SOCKET_UNLOCK(so, 1);
873 #endif
874 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
875 }
876
877 static void
878 sctp_start_net_timers(struct sctp_tcb *stcb)
879 {
880 uint32_t cnt_hb_sent;
881 struct sctp_nets *net;
882
883 cnt_hb_sent = 0;
884 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
885 /* For each network start:
886 * 1) A pmtu timer.
887 * 2) A HB timer
888 * 3) If the dest in unconfirmed send
889 * a hb as well if under max_hb_burst have
890 * been sent.
891 */
892 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
893 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
894 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
895 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
896 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
897 cnt_hb_sent++;
898 }
899 }
900 if (cnt_hb_sent) {
901 sctp_chunk_output(stcb->sctp_ep, stcb,
902 SCTP_OUTPUT_FROM_COOKIE_ACK,
903 SCTP_SO_NOT_LOCKED);
904 }
905 }
906
907
908 static void
909 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
910 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
911 {
912 struct sctp_association *asoc;
913 int some_on_streamwheel;
914 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
915 struct socket *so;
916 #endif
917
918 SCTPDBG(SCTP_DEBUG_INPUT2,
919 "sctp_handle_shutdown: handling SHUTDOWN\n");
920 if (stcb == NULL)
921 return;
922 asoc = &stcb->asoc;
923 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
924 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
925 return;
926 }
927 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
928 /* Shutdown NOT the expected size */
929 return;
930 } else {
931 sctp_update_acked(stcb, cp, abort_flag);
932 if (*abort_flag) {
933 return;
934 }
935 }
936 if (asoc->control_pdapi) {
937 /* With a normal shutdown
938 * we assume the end of last record.
939 */
940 SCTP_INP_READ_LOCK(stcb->sctp_ep);
941 asoc->control_pdapi->end_added = 1;
942 asoc->control_pdapi->pdapi_aborted = 1;
943 asoc->control_pdapi = NULL;
944 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
945 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
946 so = SCTP_INP_SO(stcb->sctp_ep);
947 atomic_add_int(&stcb->asoc.refcnt, 1);
948 SCTP_TCB_UNLOCK(stcb);
949 SCTP_SOCKET_LOCK(so, 1);
950 SCTP_TCB_LOCK(stcb);
951 atomic_subtract_int(&stcb->asoc.refcnt, 1);
952 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
953 /* assoc was freed while we were unlocked */
954 SCTP_SOCKET_UNLOCK(so, 1);
955 return;
956 }
957 #endif
958 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
959 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
960 SCTP_SOCKET_UNLOCK(so, 1);
961 #endif
962 }
963 /* goto SHUTDOWN_RECEIVED state to block new requests */
964 if (stcb->sctp_socket) {
965 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
966 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
967 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
968 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
969 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
970 /* notify upper layer that peer has initiated a shutdown */
971 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
972
973 /* reset time */
974 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
975 }
976 }
977 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
978 /*
979 * stop the shutdown timer, since we WILL move to
980 * SHUTDOWN-ACK-SENT.
981 */
982 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_8);
983 }
984 /* Now is there unsent data on a stream somewhere? */
985 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
986
987 if (!TAILQ_EMPTY(&asoc->send_queue) ||
988 !TAILQ_EMPTY(&asoc->sent_queue) ||
989 some_on_streamwheel) {
990 /* By returning we will push more data out */
991 return;
992 } else {
993 /* no outstanding data to send, so move on... */
994 /* send SHUTDOWN-ACK */
995 /* move to SHUTDOWN-ACK-SENT state */
996 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
997 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
998 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
999 }
1000 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
1001 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
1002 sctp_stop_timers_for_shutdown(stcb);
1003 sctp_send_shutdown_ack(stcb, net);
1004 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
1005 stcb, net);
1006 }
1007 }
1008
1009 static void
1010 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
1011 struct sctp_tcb *stcb,
1012 struct sctp_nets *net)
1013 {
1014 struct sctp_association *asoc;
1015 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1016 struct socket *so;
1017
1018 so = SCTP_INP_SO(stcb->sctp_ep);
1019 #endif
1020 SCTPDBG(SCTP_DEBUG_INPUT2,
1021 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1022 if (stcb == NULL)
1023 return;
1024
1025 asoc = &stcb->asoc;
1026 /* process according to association state */
1027 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
1028 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
1029 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1030 sctp_send_shutdown_complete(stcb, net, 1);
1031 SCTP_TCB_UNLOCK(stcb);
1032 return;
1033 }
1034 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
1035 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1036 /* unexpected SHUTDOWN-ACK... so ignore... */
1037 SCTP_TCB_UNLOCK(stcb);
1038 return;
1039 }
1040 if (asoc->control_pdapi) {
1041 /* With a normal shutdown
1042 * we assume the end of last record.
1043 */
1044 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1045 asoc->control_pdapi->end_added = 1;
1046 asoc->control_pdapi->pdapi_aborted = 1;
1047 asoc->control_pdapi = NULL;
1048 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1049 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1050 atomic_add_int(&stcb->asoc.refcnt, 1);
1051 SCTP_TCB_UNLOCK(stcb);
1052 SCTP_SOCKET_LOCK(so, 1);
1053 SCTP_TCB_LOCK(stcb);
1054 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1055 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1056 /* assoc was freed while we were unlocked */
1057 SCTP_SOCKET_UNLOCK(so, 1);
1058 return;
1059 }
1060 #endif
1061 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1062 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1063 SCTP_SOCKET_UNLOCK(so, 1);
1064 #endif
1065 }
1066 #ifdef INVARIANTS
1067 if (!TAILQ_EMPTY(&asoc->send_queue) ||
1068 !TAILQ_EMPTY(&asoc->sent_queue) ||
1069 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1070 panic("Queues are not empty when handling SHUTDOWN-ACK");
1071 }
1072 #endif
1073 /* stop the timer */
1074 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_9);
1075 /* send SHUTDOWN-COMPLETE */
1076 sctp_send_shutdown_complete(stcb, net, 0);
1077 /* notify upper layer protocol */
1078 if (stcb->sctp_socket) {
1079 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1080 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1081 stcb->sctp_socket->so_snd.sb_cc = 0;
1082 }
1083 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1084 }
1085 SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1086 /* free the TCB but first save off the ep */
1087 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1088 atomic_add_int(&stcb->asoc.refcnt, 1);
1089 SCTP_TCB_UNLOCK(stcb);
1090 SCTP_SOCKET_LOCK(so, 1);
1091 SCTP_TCB_LOCK(stcb);
1092 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1093 #endif
1094 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1095 SCTP_FROM_SCTP_INPUT+SCTP_LOC_10);
1096 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1097 SCTP_SOCKET_UNLOCK(so, 1);
1098 #endif
1099 }
1100
1101 /*
1102 * Skip past the param header and then we will find the chunk that caused the
1103 * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1104 * our peer must be broken.
1105 */
1106 static void
1107 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1108 struct sctp_nets *net)
1109 {
1110 struct sctp_chunkhdr *chk;
1111
1112 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1113 switch (chk->chunk_type) {
1114 case SCTP_ASCONF_ACK:
1115 case SCTP_ASCONF:
1116 sctp_asconf_cleanup(stcb, net);
1117 break;
1118 case SCTP_FORWARD_CUM_TSN:
1119 stcb->asoc.peer_supports_prsctp = 0;
1120 break;
1121 default:
1122 SCTPDBG(SCTP_DEBUG_INPUT2,
1123 "Peer does not support chunk type %d(%x)??\n",
1124 chk->chunk_type, (uint32_t) chk->chunk_type);
1125 break;
1126 }
1127 }
1128
1129 /*
1130 * Skip past the param header and then we will find the param that caused the
1131 * problem. There are a number of param's in a ASCONF OR the prsctp param
1132 * these will turn of specific features.
1133 */
1134 static void
1135 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1136 {
1137 struct sctp_paramhdr *pbad;
1138
1139 pbad = phdr + 1;
1140 switch (ntohs(pbad->param_type)) {
1141 /* pr-sctp draft */
1142 case SCTP_PRSCTP_SUPPORTED:
1143 stcb->asoc.peer_supports_prsctp = 0;
1144 break;
1145 case SCTP_SUPPORTED_CHUNK_EXT:
1146 break;
1147 /* draft-ietf-tsvwg-addip-sctp */
1148 case SCTP_HAS_NAT_SUPPORT:
1149 stcb->asoc.peer_supports_nat = 0;
1150 break;
1151 case SCTP_ADD_IP_ADDRESS:
1152 case SCTP_DEL_IP_ADDRESS:
1153 case SCTP_SET_PRIM_ADDR:
1154 stcb->asoc.peer_supports_asconf = 0;
1155 break;
1156 case SCTP_SUCCESS_REPORT:
1157 case SCTP_ERROR_CAUSE_IND:
1158 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1159 SCTPDBG(SCTP_DEBUG_INPUT2,
1160 "Turning off ASCONF to this strange peer\n");
1161 stcb->asoc.peer_supports_asconf = 0;
1162 break;
1163 default:
1164 SCTPDBG(SCTP_DEBUG_INPUT2,
1165 "Peer does not support param type %d(%x)??\n",
1166 pbad->param_type, (uint32_t) pbad->param_type);
1167 break;
1168 }
1169 }
1170
1171 static int
1172 sctp_handle_error(struct sctp_chunkhdr *ch,
1173 struct sctp_tcb *stcb, struct sctp_nets *net)
1174 {
1175 int chklen;
1176 struct sctp_paramhdr *phdr;
1177 uint16_t error, error_type;
1178 uint16_t error_len;
1179 struct sctp_association *asoc;
1180 int adjust;
1181 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1182 struct socket *so;
1183 #endif
1184
1185 /* parse through all of the errors and process */
1186 asoc = &stcb->asoc;
1187 phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1188 sizeof(struct sctp_chunkhdr));
1189 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1190 error = 0;
1191 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1192 /* Process an Error Cause */
1193 error_type = ntohs(phdr->param_type);
1194 error_len = ntohs(phdr->param_length);
1195 if ((error_len > chklen) || (error_len == 0)) {
1196 /* invalid param length for this param */
1197 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1198 chklen, error_len);
1199 return (0);
1200 }
1201 if (error == 0) {
1202 /* report the first error cause */
1203 error = error_type;
1204 }
1205 switch (error_type) {
1206 case SCTP_CAUSE_INVALID_STREAM:
1207 case SCTP_CAUSE_MISSING_PARAM:
1208 case SCTP_CAUSE_INVALID_PARAM:
1209 case SCTP_CAUSE_NO_USER_DATA:
1210 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1211 error_type);
1212 break;
1213 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1214 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1215 ch->chunk_flags);
1216 if (sctp_handle_nat_colliding_state(stcb)) {
1217 return (0);
1218 }
1219 break;
1220 case SCTP_CAUSE_NAT_MISSING_STATE:
1221 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1222 ch->chunk_flags);
1223 if (sctp_handle_nat_missing_state(stcb, net)) {
1224 return (0);
1225 }
1226 break;
1227 case SCTP_CAUSE_STALE_COOKIE:
1228 /*
1229 * We only act if we have echoed a cookie and are
1230 * waiting.
1231 */
1232 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1233 int *p;
1234
1235 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1236 /* Save the time doubled */
1237 asoc->cookie_preserve_req = ntohl(*p) << 1;
1238 asoc->stale_cookie_count++;
1239 if (asoc->stale_cookie_count >
1240 asoc->max_init_times) {
1241 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1242 /* now free the asoc */
1243 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1244 so = SCTP_INP_SO(stcb->sctp_ep);
1245 atomic_add_int(&stcb->asoc.refcnt, 1);
1246 SCTP_TCB_UNLOCK(stcb);
1247 SCTP_SOCKET_LOCK(so, 1);
1248 SCTP_TCB_LOCK(stcb);
1249 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1250 #endif
1251 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1252 SCTP_FROM_SCTP_INPUT+SCTP_LOC_11);
1253 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1254 SCTP_SOCKET_UNLOCK(so, 1);
1255 #endif
1256 return (-1);
1257 }
1258 /* blast back to INIT state */
1259 sctp_toss_old_cookies(stcb, &stcb->asoc);
1260 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1261 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1262 sctp_stop_all_cookie_timers(stcb);
1263 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1264 }
1265 break;
1266 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1267 /*
1268 * Nothing we can do here, we don't do hostname
1269 * addresses so if the peer does not like my IPv6
1270 * (or IPv4 for that matter) it does not matter. If
1271 * they don't support that type of address, they can
1272 * NOT possibly get that packet type... i.e. with no
1273 * IPv6 you can't recieve a IPv6 packet. so we can
1274 * safely ignore this one. If we ever added support
1275 * for HOSTNAME Addresses, then we would need to do
1276 * something here.
1277 */
1278 break;
1279 case SCTP_CAUSE_UNRECOG_CHUNK:
1280 sctp_process_unrecog_chunk(stcb, phdr, net);
1281 break;
1282 case SCTP_CAUSE_UNRECOG_PARAM:
1283 sctp_process_unrecog_param(stcb, phdr);
1284 break;
1285 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1286 /*
1287 * We ignore this since the timer will drive out a
1288 * new cookie anyway and there timer will drive us
1289 * to send a SHUTDOWN_COMPLETE. We can't send one
1290 * here since we don't have their tag.
1291 */
1292 break;
1293 case SCTP_CAUSE_DELETING_LAST_ADDR:
1294 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1295 case SCTP_CAUSE_DELETING_SRC_ADDR:
1296 /*
1297 * We should NOT get these here, but in a
1298 * ASCONF-ACK.
1299 */
1300 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1301 error_type);
1302 break;
1303 case SCTP_CAUSE_OUT_OF_RESC:
1304 /*
1305 * And what, pray tell do we do with the fact that
1306 * the peer is out of resources? Not really sure we
1307 * could do anything but abort. I suspect this
1308 * should have came WITH an abort instead of in a
1309 * OP-ERROR.
1310 */
1311 break;
1312 default:
1313 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1314 error_type);
1315 break;
1316 }
1317 adjust = SCTP_SIZE32(error_len);
1318 chklen -= adjust;
1319 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1320 }
1321 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1322 return (0);
1323 }
1324
1325 static int
1326 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1327 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1328 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1329 struct sctp_nets *net, int *abort_no_unlock,
1330 #if defined(__FreeBSD__)
1331 uint8_t use_mflowid, uint32_t mflowid,
1332 #endif
1333 uint32_t vrf_id)
1334 {
1335 struct sctp_init_ack *init_ack;
1336 struct mbuf *op_err;
1337
1338 SCTPDBG(SCTP_DEBUG_INPUT2,
1339 "sctp_handle_init_ack: handling INIT-ACK\n");
1340
1341 if (stcb == NULL) {
1342 SCTPDBG(SCTP_DEBUG_INPUT2,
1343 "sctp_handle_init_ack: TCB is null\n");
1344 return (-1);
1345 }
1346 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1347 /* Invalid length */
1348 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1349 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1350 src, dst, sh, op_err,
1351 #if defined(__FreeBSD__)
1352 use_mflowid, mflowid,
1353 #endif
1354 vrf_id, net->port);
1355 *abort_no_unlock = 1;
1356 return (-1);
1357 }
1358 init_ack = &cp->init;
1359 /* validate parameters */
1360 if (init_ack->initiate_tag == 0) {
1361 /* protocol error... send an abort */
1362 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1363 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1364 src, dst, sh, op_err,
1365 #if defined(__FreeBSD__)
1366 use_mflowid, mflowid,
1367 #endif
1368 vrf_id, net->port);
1369 *abort_no_unlock = 1;
1370 return (-1);
1371 }
1372 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1373 /* protocol error... send an abort */
1374 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1375 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1376 src, dst, sh, op_err,
1377 #if defined(__FreeBSD__)
1378 use_mflowid, mflowid,
1379 #endif
1380 vrf_id, net->port);
1381 *abort_no_unlock = 1;
1382 return (-1);
1383 }
1384 if (init_ack->num_inbound_streams == 0) {
1385 /* protocol error... send an abort */
1386 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1387 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1388 src, dst, sh, op_err,
1389 #if defined(__FreeBSD__)
1390 use_mflowid, mflowid,
1391 #endif
1392 vrf_id, net->port);
1393 *abort_no_unlock = 1;
1394 return (-1);
1395 }
1396 if (init_ack->num_outbound_streams == 0) {
1397 /* protocol error... send an abort */
1398 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
1399 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1400 src, dst, sh, op_err,
1401 #if defined(__FreeBSD__)
1402 use_mflowid, mflowid,
1403 #endif
1404 vrf_id, net->port);
1405 *abort_no_unlock = 1;
1406 return (-1);
1407 }
1408 /* process according to association state... */
1409 switch (stcb->asoc.state & SCTP_STATE_MASK) {
1410 case SCTP_STATE_COOKIE_WAIT:
1411 /* this is the expected state for this chunk */
1412 /* process the INIT-ACK parameters */
1413 if (stcb->asoc.primary_destination->dest_state &
1414 SCTP_ADDR_UNCONFIRMED) {
1415 /*
1416 * The primary is where we sent the INIT, we can
1417 * always consider it confirmed when the INIT-ACK is
1418 * returned. Do this before we load addresses
1419 * though.
1420 */
1421 stcb->asoc.primary_destination->dest_state &=
1422 ~SCTP_ADDR_UNCONFIRMED;
1423 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1424 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1425 }
1426 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1427 net, abort_no_unlock,
1428 #if defined(__FreeBSD__)
1429 use_mflowid, mflowid,
1430 #endif
1431 vrf_id) < 0) {
1432 /* error in parsing parameters */
1433 return (-1);
1434 }
1435 /* update our state */
1436 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1437 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1438
1439 /* reset the RTO calc */
1440 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1441 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1442 stcb->asoc.overall_error_count,
1443 0,
1444 SCTP_FROM_SCTP_INPUT,
1445 __LINE__);
1446 }
1447 stcb->asoc.overall_error_count = 0;
1448 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1449 /*
1450 * collapse the init timer back in case of a exponential
1451 * backoff
1452 */
1453 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1454 stcb, net);
1455 /*
1456 * the send at the end of the inbound data processing will
1457 * cause the cookie to be sent
1458 */
1459 break;
1460 case SCTP_STATE_SHUTDOWN_SENT:
1461 /* incorrect state... discard */
1462 break;
1463 case SCTP_STATE_COOKIE_ECHOED:
1464 /* incorrect state... discard */
1465 break;
1466 case SCTP_STATE_OPEN:
1467 /* incorrect state... discard */
1468 break;
1469 case SCTP_STATE_EMPTY:
1470 case SCTP_STATE_INUSE:
1471 default:
1472 /* incorrect state... discard */
1473 return (-1);
1474 break;
1475 }
1476 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1477 return (0);
1478 }
1479
1480 static struct sctp_tcb *
1481 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1482 struct sockaddr *src, struct sockaddr *dst,
1483 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1484 struct sctp_inpcb *inp, struct sctp_nets **netp,
1485 struct sockaddr *init_src, int *notification,
1486 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1487 #if defined(__FreeBSD__)
1488 uint8_t use_mflowid, uint32_t mflowid,
1489 #endif
1490 uint32_t vrf_id, uint16_t port);
1491
1492
1493 /*
1494 * handle a state cookie for an existing association m: input packet mbuf
1495 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1496 * "split" mbuf and the cookie signature does not exist offset: offset into
1497 * mbuf to the cookie-echo chunk
1498 */
1499 static struct sctp_tcb *
1500 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1501 struct sockaddr *src, struct sockaddr *dst,
1502 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1503 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1504 struct sockaddr *init_src, int *notification,
1505 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1506 #if defined(__FreeBSD__)
1507 uint8_t use_mflowid, uint32_t mflowid,
1508 #endif
1509 uint32_t vrf_id, uint16_t port)
1510 {
1511 struct sctp_association *asoc;
1512 struct sctp_init_chunk *init_cp, init_buf;
1513 struct sctp_init_ack_chunk *initack_cp, initack_buf;
1514 struct sctp_nets *net;
1515 struct mbuf *op_err;
1516 struct sctp_paramhdr *ph;
1517 int init_offset, initack_offset, i;
1518 int retval;
1519 int spec_flag = 0;
1520 uint32_t how_indx;
1521
1522 net = *netp;
1523 /* I know that the TCB is non-NULL from the caller */
1524 asoc = &stcb->asoc;
1525 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1526 if (asoc->cookie_how[how_indx] == 0)
1527 break;
1528 }
1529 if (how_indx < sizeof(asoc->cookie_how)) {
1530 asoc->cookie_how[how_indx] = 1;
1531 }
1532 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1533 /* SHUTDOWN came in after sending INIT-ACK */
1534 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1535 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1536 0, M_NOWAIT, 1, MT_DATA);
1537 if (op_err == NULL) {
1538 /* FOOBAR */
1539 return (NULL);
1540 }
1541 /* Set the len */
1542 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1543 ph = mtod(op_err, struct sctp_paramhdr *);
1544 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1545 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1546 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1547 #if defined(__FreeBSD__)
1548 use_mflowid, mflowid,
1549 #endif
1550 vrf_id, net->port);
1551 if (how_indx < sizeof(asoc->cookie_how))
1552 asoc->cookie_how[how_indx] = 2;
1553 return (NULL);
1554 }
1555 /*
1556 * find and validate the INIT chunk in the cookie (peer's info) the
1557 * INIT should start after the cookie-echo header struct (chunk
1558 * header, state cookie header struct)
1559 */
1560 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1561
1562 init_cp = (struct sctp_init_chunk *)
1563 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1564 (uint8_t *) & init_buf);
1565 if (init_cp == NULL) {
1566 /* could not pull a INIT chunk in cookie */
1567 return (NULL);
1568 }
1569 if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1570 return (NULL);
1571 }
1572 /*
1573 * find and validate the INIT-ACK chunk in the cookie (my info) the
1574 * INIT-ACK follows the INIT chunk
1575 */
1576 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1577 initack_cp = (struct sctp_init_ack_chunk *)
1578 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1579 (uint8_t *) & initack_buf);
1580 if (initack_cp == NULL) {
1581 /* could not pull INIT-ACK chunk in cookie */
1582 return (NULL);
1583 }
1584 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1585 return (NULL);
1586 }
1587 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1588 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1589 /*
1590 * case D in Section 5.2.4 Table 2: MMAA process accordingly
1591 * to get into the OPEN state
1592 */
1593 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1594 /*-
1595 * Opps, this means that we somehow generated two vtag's
1596 * the same. I.e. we did:
1597 * Us Peer
1598 * <---INIT(tag=a)------
1599 * ----INIT-ACK(tag=t)-->
1600 * ----INIT(tag=t)------> *1
1601 * <---INIT-ACK(tag=a)---
1602 * <----CE(tag=t)------------- *2
1603 *
1604 * At point *1 we should be generating a different
1605 * tag t'. Which means we would throw away the CE and send
1606 * ours instead. Basically this is case C (throw away side).
1607 */
1608 if (how_indx < sizeof(asoc->cookie_how))
1609 asoc->cookie_how[how_indx] = 17;
1610 return (NULL);
1611
1612 }
1613 switch (SCTP_GET_STATE(asoc)) {
1614 case SCTP_STATE_COOKIE_WAIT:
1615 case SCTP_STATE_COOKIE_ECHOED:
1616 /*
1617 * INIT was sent but got a COOKIE_ECHO with the
1618 * correct tags... just accept it...but we must
1619 * process the init so that we can make sure we
1620 * have the right seq no's.
1621 */
1622 /* First we must process the INIT !! */
1623 retval = sctp_process_init(init_cp, stcb);
1624 if (retval < 0) {
1625 if (how_indx < sizeof(asoc->cookie_how))
1626 asoc->cookie_how[how_indx] = 3;
1627 return (NULL);
1628 }
1629 /* we have already processed the INIT so no problem */
1630 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1631 net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_12);
1632 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_13);
1633 /* update current state */
1634 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1635 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1636 else
1637 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1638
1639 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1640 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1641 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1642 stcb->sctp_ep, stcb, asoc->primary_destination);
1643 }
1644 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1645 sctp_stop_all_cookie_timers(stcb);
1646 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1647 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1648 (inp->sctp_socket->so_qlimit == 0)
1649 ) {
1650 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1651 struct socket *so;
1652 #endif
1653 /*
1654 * Here is where collision would go if we
1655 * did a connect() and instead got a
1656 * init/init-ack/cookie done before the
1657 * init-ack came back..
1658 */
1659 stcb->sctp_ep->sctp_flags |=
1660 SCTP_PCB_FLAGS_CONNECTED;
1661 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1662 so = SCTP_INP_SO(stcb->sctp_ep);
1663 atomic_add_int(&stcb->asoc.refcnt, 1);
1664 SCTP_TCB_UNLOCK(stcb);
1665 SCTP_SOCKET_LOCK(so, 1);
1666 SCTP_TCB_LOCK(stcb);
1667 atomic_add_int(&stcb->asoc.refcnt, -1);
1668 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1669 SCTP_SOCKET_UNLOCK(so, 1);
1670 return (NULL);
1671 }
1672 #endif
1673 soisconnected(stcb->sctp_socket);
1674 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1675 SCTP_SOCKET_UNLOCK(so, 1);
1676 #endif
1677 }
1678 /* notify upper layer */
1679 *notification = SCTP_NOTIFY_ASSOC_UP;
1680 /*
1681 * since we did not send a HB make sure we
1682 * don't double things
1683 */
1684 net->hb_responded = 1;
1685 net->RTO = sctp_calculate_rto(stcb, asoc, net,
1686 &cookie->time_entered,
1687 sctp_align_unsafe_makecopy,
1688 SCTP_RTT_FROM_NON_DATA);
1689
1690 if (stcb->asoc.sctp_autoclose_ticks &&
1691 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1692 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1693 inp, stcb, NULL);
1694 }
1695 break;
1696 default:
1697 /*
1698 * we're in the OPEN state (or beyond), so
1699 * peer must have simply lost the COOKIE-ACK
1700 */
1701 break;
1702 } /* end switch */
1703 sctp_stop_all_cookie_timers(stcb);
1704 /*
1705 * We ignore the return code here.. not sure if we should
1706 * somehow abort.. but we do have an existing asoc. This
1707 * really should not fail.
1708 */
1709 if (sctp_load_addresses_from_init(stcb, m,
1710 init_offset + sizeof(struct sctp_init_chunk),
1711 initack_offset, src, dst, init_src)) {
1712 if (how_indx < sizeof(asoc->cookie_how))
1713 asoc->cookie_how[how_indx] = 4;
1714 return (NULL);
1715 }
1716 /* respond with a COOKIE-ACK */
1717 sctp_toss_old_cookies(stcb, asoc);
1718 sctp_send_cookie_ack(stcb);
1719 if (how_indx < sizeof(asoc->cookie_how))
1720 asoc->cookie_how[how_indx] = 5;
1721 return (stcb);
1722 }
1723
1724 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1725 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1726 cookie->tie_tag_my_vtag == 0 &&
1727 cookie->tie_tag_peer_vtag == 0) {
1728 /*
1729 * case C in Section 5.2.4 Table 2: XMOO silently discard
1730 */
1731 if (how_indx < sizeof(asoc->cookie_how))
1732 asoc->cookie_how[how_indx] = 6;
1733 return (NULL);
1734 }
1735 /* If nat support, and the below and stcb is established,
1736 * send back a ABORT(colliding state) if we are established.
1737 */
1738 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1739 (asoc->peer_supports_nat) &&
1740 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1741 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1742 (asoc->peer_vtag == 0)))) {
1743 /* Special case - Peer's support nat. We may have
1744 * two init's that we gave out the same tag on since
1745 * one was not established.. i.e. we get INIT from host-1
1746 * behind the nat and we respond tag-a, we get a INIT from
1747 * host-2 behind the nat and we get tag-a again. Then we
1748 * bring up host-1 (or 2's) assoc, Then comes the cookie
1749 * from hsot-2 (or 1). Now we have colliding state. We must
1750 * send an abort here with colliding state indication.
1751 */
1752 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
1753 0, M_NOWAIT, 1, MT_DATA);
1754 if (op_err == NULL) {
1755 /* FOOBAR */
1756 return (NULL);
1757 }
1758 /* pre-reserve some space */
1759 #ifdef INET6
1760 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
1761 #else
1762 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
1763 #endif
1764 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
1765 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
1766 /* Set the len */
1767 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr);
1768 ph = mtod(op_err, struct sctp_paramhdr *);
1769 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE);
1770 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1771 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1772 #if defined(__FreeBSD__)
1773 use_mflowid, mflowid,
1774 #endif
1775 vrf_id, port);
1776 return (NULL);
1777 }
1778 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1779 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1780 (asoc->peer_vtag == 0))) {
1781 /*
1782 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1783 * should be ok, re-accept peer info
1784 */
1785 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1786 /* Extension of case C.
1787 * If we hit this, then the random number
1788 * generator returned the same vtag when we
1789 * first sent our INIT-ACK and when we later sent
1790 * our INIT. The side with the seq numbers that are
1791 * different will be the one that normnally would
1792 * have hit case C. This in effect "extends" our vtags
1793 * in this collision case to be 64 bits. The same collision
1794 * could occur aka you get both vtag and seq number the
1795 * same twice in a row.. but is much less likely. If it
1796 * did happen then we would proceed through and bring
1797 * up the assoc.. we may end up with the wrong stream
1798 * setup however.. which would be bad.. but there is
1799 * no way to tell.. until we send on a stream that does
1800 * not exist :-)
1801 */
1802 if (how_indx < sizeof(asoc->cookie_how))
1803 asoc->cookie_how[how_indx] = 7;
1804
1805 return (NULL);
1806 }
1807 if (how_indx < sizeof(asoc->cookie_how))
1808 asoc->cookie_how[how_indx] = 8;
1809 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_14);
1810 sctp_stop_all_cookie_timers(stcb);
1811 /*
1812 * since we did not send a HB make sure we don't double
1813 * things
1814 */
1815 net->hb_responded = 1;
1816 if (stcb->asoc.sctp_autoclose_ticks &&
1817 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1818 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1819 NULL);
1820 }
1821 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1822 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1823
1824 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1825 /* Ok the peer probably discarded our
1826 * data (if we echoed a cookie+data). So anything
1827 * on the sent_queue should be marked for
1828 * retransmit, we may not get something to
1829 * kick us so it COULD still take a timeout
1830 * to move these.. but it can't hurt to mark them.
1831 */
1832 struct sctp_tmit_chunk *chk;
1833 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1834 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1835 chk->sent = SCTP_DATAGRAM_RESEND;
1836 sctp_flight_size_decrease(chk);
1837 sctp_total_flight_decrease(stcb, chk);
1838 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1839 spec_flag++;
1840 }
1841 }
1842
1843 }
1844 /* process the INIT info (peer's info) */
1845 retval = sctp_process_init(init_cp, stcb);
1846 if (retval < 0) {
1847 if (how_indx < sizeof(asoc->cookie_how))
1848 asoc->cookie_how[how_indx] = 9;
1849 return (NULL);
1850 }
1851 if (sctp_load_addresses_from_init(stcb, m,
1852 init_offset + sizeof(struct sctp_init_chunk),
1853 initack_offset, src, dst, init_src)) {
1854 if (how_indx < sizeof(asoc->cookie_how))
1855 asoc->cookie_how[how_indx] = 10;
1856 return (NULL);
1857 }
1858 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1859 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1860 *notification = SCTP_NOTIFY_ASSOC_UP;
1861
1862 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1863 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1864 (inp->sctp_socket->so_qlimit == 0)) {
1865 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1866 struct socket *so;
1867 #endif
1868 stcb->sctp_ep->sctp_flags |=
1869 SCTP_PCB_FLAGS_CONNECTED;
1870 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1871 so = SCTP_INP_SO(stcb->sctp_ep);
1872 atomic_add_int(&stcb->asoc.refcnt, 1);
1873 SCTP_TCB_UNLOCK(stcb);
1874 SCTP_SOCKET_LOCK(so, 1);
1875 SCTP_TCB_LOCK(stcb);
1876 atomic_add_int(&stcb->asoc.refcnt, -1);
1877 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1878 SCTP_SOCKET_UNLOCK(so, 1);
1879 return (NULL);
1880 }
1881 #endif
1882 soisconnected(stcb->sctp_socket);
1883 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1884 SCTP_SOCKET_UNLOCK(so, 1);
1885 #endif
1886 }
1887 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1888 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1889 else
1890 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1891 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1892 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1893 SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1894 } else {
1895 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1896 }
1897 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1898 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1899 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1900 stcb->sctp_ep, stcb, asoc->primary_destination);
1901 }
1902 sctp_stop_all_cookie_timers(stcb);
1903 sctp_toss_old_cookies(stcb, asoc);
1904 sctp_send_cookie_ack(stcb);
1905 if (spec_flag) {
1906 /* only if we have retrans set do we do this. What
1907 * this call does is get only the COOKIE-ACK out
1908 * and then when we return the normal call to
1909 * sctp_chunk_output will get the retrans out
1910 * behind this.
1911 */
1912 sctp_chunk_output(inp,stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1913 }
1914 if (how_indx < sizeof(asoc->cookie_how))
1915 asoc->cookie_how[how_indx] = 11;
1916
1917 return (stcb);
1918 }
1919 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1920 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1921 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1922 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1923 cookie->tie_tag_peer_vtag != 0) {
1924 struct sctpasochead *head;
1925 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1926 struct socket *so;
1927 #endif
1928
1929 if (asoc->peer_supports_nat) {
1930 /* This is a gross gross hack.
1931 * Just call the cookie_new code since we
1932 * are allowing a duplicate association.
1933 * I hope this works...
1934 */
1935 return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1936 sh, cookie, cookie_len,
1937 inp, netp, init_src,notification,
1938 auth_skipped, auth_offset, auth_len,
1939 #if defined(__FreeBSD__)
1940 use_mflowid, mflowid,
1941 #endif
1942 vrf_id, port));
1943 }
1944 /*
1945 * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1946 */
1947 /* temp code */
1948 if (how_indx < sizeof(asoc->cookie_how))
1949 asoc->cookie_how[how_indx] = 12;
1950 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_15);
1951 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_16);
1952
1953 /* notify upper layer */
1954 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1955 atomic_add_int(&stcb->asoc.refcnt, 1);
1956 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1957 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1958 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1959 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1960 }
1961 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1962 SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1963 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1964 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1965 }
1966 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1967 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1968 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1969 stcb->sctp_ep, stcb, asoc->primary_destination);
1970
1971 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1972 /* move to OPEN state, if not in SHUTDOWN_SENT */
1973 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1974 }
1975 asoc->pre_open_streams =
1976 ntohs(initack_cp->init.num_outbound_streams);
1977 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1978 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1979 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1980
1981 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1982
1983 asoc->str_reset_seq_in = asoc->init_seq_number;
1984
1985 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1986 if (asoc->mapping_array) {
1987 memset(asoc->mapping_array, 0,
1988 asoc->mapping_array_size);
1989 }
1990 if (asoc->nr_mapping_array) {
1991 memset(asoc->nr_mapping_array, 0,
1992 asoc->mapping_array_size);
1993 }
1994 SCTP_TCB_UNLOCK(stcb);
1995 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1996 so = SCTP_INP_SO(stcb->sctp_ep);
1997 SCTP_SOCKET_LOCK(so, 1);
1998 #endif
1999 SCTP_INP_INFO_WLOCK();
2000 SCTP_INP_WLOCK(stcb->sctp_ep);
2001 SCTP_TCB_LOCK(stcb);
2002 atomic_add_int(&stcb->asoc.refcnt, -1);
2003 /* send up all the data */
2004 SCTP_TCB_SEND_LOCK(stcb);
2005
2006 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
2007 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
2008 stcb->asoc.strmout[i].chunks_on_queues = 0;
2009 stcb->asoc.strmout[i].stream_no = i;
2010 stcb->asoc.strmout[i].next_sequence_send = 0;
2011 stcb->asoc.strmout[i].last_msg_incomplete = 0;
2012 }
2013 /* process the INIT-ACK info (my info) */
2014 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2015 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2016
2017 /* pull from vtag hash */
2018 LIST_REMOVE(stcb, sctp_asocs);
2019 /* re-insert to new vtag position */
2020 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
2021 SCTP_BASE_INFO(hashasocmark))];
2022 /*
2023 * put it in the bucket in the vtag hash of assoc's for the
2024 * system
2025 */
2026 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
2027
2028 SCTP_TCB_SEND_UNLOCK(stcb);
2029 SCTP_INP_WUNLOCK(stcb->sctp_ep);
2030 SCTP_INP_INFO_WUNLOCK();
2031 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2032 SCTP_SOCKET_UNLOCK(so, 1);
2033 #endif
2034 asoc->total_flight = 0;
2035 asoc->total_flight_count = 0;
2036 /* process the INIT info (peer's info) */
2037 retval = sctp_process_init(init_cp, stcb);
2038 if (retval < 0) {
2039 if (how_indx < sizeof(asoc->cookie_how))
2040 asoc->cookie_how[how_indx] = 13;
2041
2042 return (NULL);
2043 }
2044 /*
2045 * since we did not send a HB make sure we don't double
2046 * things
2047 */
2048 net->hb_responded = 1;
2049
2050 if (sctp_load_addresses_from_init(stcb, m,
2051 init_offset + sizeof(struct sctp_init_chunk),
2052 initack_offset, src, dst, init_src)) {
2053 if (how_indx < sizeof(asoc->cookie_how))
2054 asoc->cookie_how[how_indx] = 14;
2055
2056 return (NULL);
2057 }
2058 /* respond with a COOKIE-ACK */
2059 sctp_stop_all_cookie_timers(stcb);
2060 sctp_toss_old_cookies(stcb, asoc);
2061 sctp_send_cookie_ack(stcb);
2062 if (how_indx < sizeof(asoc->cookie_how))
2063 asoc->cookie_how[how_indx] = 15;
2064
2065 return (stcb);
2066 }
2067 if (how_indx < sizeof(asoc->cookie_how))
2068 asoc->cookie_how[how_indx] = 16;
2069 /* all other cases... */
2070 return (NULL);
2071 }
2072
2073
2074 /*
2075 * handle a state cookie for a new association m: input packet mbuf chain--
2076 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2077 * and the cookie signature does not exist offset: offset into mbuf to the
2078 * cookie-echo chunk length: length of the cookie chunk to: where the init
2079 * was from returns a new TCB
2080 */
2081 static struct sctp_tcb *
2082 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2083 struct sockaddr *src, struct sockaddr *dst,
2084 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2085 struct sctp_inpcb *inp, struct sctp_nets **netp,
2086 struct sockaddr *init_src, int *notification,
2087 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2088 #if defined(__FreeBSD__)
2089 uint8_t use_mflowid, uint32_t mflowid,
2090 #endif
2091 uint32_t vrf_id, uint16_t port)
2092 {
2093 struct sctp_tcb *stcb;
2094 struct sctp_init_chunk *init_cp, init_buf;
2095 struct sctp_init_ack_chunk *initack_cp, initack_buf;
2096 struct sockaddr_storage sa_store;
2097 struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
2098 struct sctp_association *asoc;
2099 int init_offset, initack_offset, initack_limit;
2100 int retval;
2101 int error = 0;
2102 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2103 #ifdef INET
2104 struct sockaddr_in *sin;
2105 #endif
2106 #ifdef INET6
2107 struct sockaddr_in6 *sin6;
2108 #endif
2109 #if defined(__Userspace__)
2110 struct sockaddr_conn *sconn;
2111 #endif
2112 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2113 struct socket *so;
2114
2115 so = SCTP_INP_SO(inp);
2116 #endif
2117
2118 /*
2119 * find and validate the INIT chunk in the cookie (peer's info) the
2120 * INIT should start after the cookie-echo header struct (chunk
2121 * header, state cookie header struct)
2122 */
2123 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2124 init_cp = (struct sctp_init_chunk *)
2125 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2126 (uint8_t *) & init_buf);
2127 if (init_cp == NULL) {
2128 /* could not pull a INIT chunk in cookie */
2129 SCTPDBG(SCTP_DEBUG_INPUT1,
2130 "process_cookie_new: could not pull INIT chunk hdr\n");
2131 return (NULL);
2132 }
2133 if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2134 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2135 return (NULL);
2136 }
2137 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2138 /*
2139 * find and validate the INIT-ACK chunk in the cookie (my info) the
2140 * INIT-ACK follows the INIT chunk
2141 */
2142 initack_cp = (struct sctp_init_ack_chunk *)
2143 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2144 (uint8_t *) & initack_buf);
2145 if (initack_cp == NULL) {
2146 /* could not pull INIT-ACK chunk in cookie */
2147 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2148 return (NULL);
2149 }
2150 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2151 return (NULL);
2152 }
2153 /*
2154 * NOTE: We can't use the INIT_ACK's chk_length to determine the
2155 * "initack_limit" value. This is because the chk_length field
2156 * includes the length of the cookie, but the cookie is omitted when
2157 * the INIT and INIT_ACK are tacked onto the cookie...
2158 */
2159 initack_limit = offset + cookie_len;
2160
2161 /*
2162 * now that we know the INIT/INIT-ACK are in place, create a new TCB
2163 * and popluate
2164 */
2165
2166 /*
2167 * Here we do a trick, we set in NULL for the proc/thread argument. We
2168 * do this since in effect we only use the p argument when
2169 * the socket is unbound and we must do an implicit bind.
2170 * Since we are getting a cookie, we cannot be unbound.
2171 */
2172 stcb = sctp_aloc_assoc(inp, init_src, &error,
2173 ntohl(initack_cp->init.initiate_tag), vrf_id,
2174 #if defined(__FreeBSD__) && __FreeBSD_version >= 500000
2175 (struct thread *)NULL
2176 #elif defined(__Windows__)
2177 (PKTHREAD)NULL
2178 #else
2179 (struct proc *)NULL
2180 #endif
2181 );
2182 if (stcb == NULL) {
2183 struct mbuf *op_err;
2184
2185 /* memory problem? */
2186 SCTPDBG(SCTP_DEBUG_INPUT1,
2187 "process_cookie_new: no room for another TCB!\n");
2188 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2189
2190 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2191 src, dst, sh, op_err,
2192 #if defined(__FreeBSD__)
2193 use_mflowid, mflowid,
2194 #endif
2195 vrf_id, port);
2196 return (NULL);
2197 }
2198 /* get the correct sctp_nets */
2199 if (netp)
2200 *netp = sctp_findnet(stcb, init_src);
2201
2202 asoc = &stcb->asoc;
2203 /* get scope variables out of cookie */
2204 asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2205 asoc->scope.site_scope = cookie->site_scope;
2206 asoc->scope.local_scope = cookie->local_scope;
2207 asoc->scope.loopback_scope = cookie->loopback_scope;
2208
2209 #if defined(__Userspace__)
2210 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2211 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal) ||
2212 (asoc->scope.conn_addr_legal != cookie->conn_addr_legal)) {
2213 #else
2214 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2215 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2216 #endif
2217 struct mbuf *op_err;
2218
2219 /*
2220 * Houston we have a problem. The EP changed while the
2221 * cookie was in flight. Only recourse is to abort the
2222 * association.
2223 */
2224 atomic_add_int(&stcb->asoc.refcnt, 1);
2225 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2226 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2227 src, dst, sh, op_err,
2228 #if defined(__FreeBSD__)
2229 use_mflowid, mflowid,
2230 #endif
2231 vrf_id, port);
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_16);
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 }
2245 /* process the INIT-ACK info (my info) */
2246 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2247 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2248 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2249 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2250 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2251 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2252 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2253 asoc->str_reset_seq_in = asoc->init_seq_number;
2254
2255 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2256
2257 /* process the INIT info (peer's info) */
2258 if (netp)
2259 retval = sctp_process_init(init_cp, stcb);
2260 else
2261 retval = 0;
2262 if (retval < 0) {
2263 atomic_add_int(&stcb->asoc.refcnt, 1);
2264 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2265 SCTP_TCB_UNLOCK(stcb);
2266 SCTP_SOCKET_LOCK(so, 1);
2267 SCTP_TCB_LOCK(stcb);
2268 #endif
2269 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_16);
2270 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2271 SCTP_SOCKET_UNLOCK(so, 1);
2272 #endif
2273 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2274 return (NULL);
2275 }
2276 /* load all addresses */
2277 if (sctp_load_addresses_from_init(stcb, m,
2278 init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2279 src, dst, init_src)) {
2280 atomic_add_int(&stcb->asoc.refcnt, 1);
2281 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2282 SCTP_TCB_UNLOCK(stcb);
2283 SCTP_SOCKET_LOCK(so, 1);
2284 SCTP_TCB_LOCK(stcb);
2285 #endif
2286 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_17);
2287 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2288 SCTP_SOCKET_UNLOCK(so, 1);
2289 #endif
2290 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2291 return (NULL);
2292 }
2293 /*
2294 * verify any preceding AUTH chunk that was skipped
2295 */
2296 /* pull the local authentication parameters from the cookie/init-ack */
2297 sctp_auth_get_cookie_params(stcb, m,
2298 initack_offset + sizeof(struct sctp_init_ack_chunk),
2299 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2300 if (auth_skipped) {
2301 struct sctp_auth_chunk *auth;
2302
2303 auth = (struct sctp_auth_chunk *)
2304 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2305 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2306 /* auth HMAC failed, dump the assoc and packet */
2307 SCTPDBG(SCTP_DEBUG_AUTH1,
2308 "COOKIE-ECHO: AUTH failed\n");
2309 atomic_add_int(&stcb->asoc.refcnt, 1);
2310 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2311 SCTP_TCB_UNLOCK(stcb);
2312 SCTP_SOCKET_LOCK(so, 1);
2313 SCTP_TCB_LOCK(stcb);
2314 #endif
2315 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_18);
2316 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2317 SCTP_SOCKET_UNLOCK(so, 1);
2318 #endif
2319 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2320 return (NULL);
2321 } else {
2322 /* remaining chunks checked... good to go */
2323 stcb->asoc.authenticated = 1;
2324 }
2325 }
2326 /* update current state */
2327 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2328 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2329 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2330 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2331 stcb->sctp_ep, stcb, asoc->primary_destination);
2332 }
2333 sctp_stop_all_cookie_timers(stcb);
2334 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2335 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2336
2337 /*
2338 * if we're doing ASCONFs, check to see if we have any new local
2339 * addresses that need to get added to the peer (eg. addresses
2340 * changed while cookie echo in flight). This needs to be done
2341 * after we go to the OPEN state to do the correct asconf
2342 * processing. else, make sure we have the correct addresses in our
2343 * lists
2344 */
2345
2346 /* warning, we re-use sin, sin6, sa_store here! */
2347 /* pull in local_address (our "from" address) */
2348 switch (cookie->laddr_type) {
2349 #ifdef INET
2350 case SCTP_IPV4_ADDRESS:
2351 /* source addr is IPv4 */
2352 sin = (struct sockaddr_in *)initack_src;
2353 memset(sin, 0, sizeof(*sin));
2354 sin->sin_family = AF_INET;
2355 #ifdef HAVE_SIN_LEN
2356 sin->sin_len = sizeof(struct sockaddr_in);
2357 #endif
2358 sin->sin_addr.s_addr = cookie->laddress[0];
2359 break;
2360 #endif
2361 #ifdef INET6
2362 case SCTP_IPV6_ADDRESS:
2363 /* source addr is IPv6 */
2364 sin6 = (struct sockaddr_in6 *)initack_src;
2365 memset(sin6, 0, sizeof(*sin6));
2366 sin6->sin6_family = AF_INET6;
2367 #ifdef HAVE_SIN6_LEN
2368 sin6->sin6_len = sizeof(struct sockaddr_in6);
2369 #endif
2370 sin6->sin6_scope_id = cookie->scope_id;
2371 memcpy(&sin6->sin6_addr, cookie->laddress,
2372 sizeof(sin6->sin6_addr));
2373 break;
2374 #endif
2375 #if defined(__Userspace__)
2376 case SCTP_CONN_ADDRESS:
2377 /* source addr is IPv4 */
2378 sconn = (struct sockaddr_conn *)initack_src;
2379 memset(sconn, 0, sizeof(struct sockaddr_conn));
2380 sconn->sconn_family = AF_CONN;
2381 #ifdef HAVE_SCONN_LEN
2382 sconn->sconn_len = sizeof(struct sockaddr_conn);
2383 #endif
2384 memcpy(&sconn->sconn_addr, cookie->laddress, sizeof(void *));
2385 break;
2386 #endif
2387 default:
2388 atomic_add_int(&stcb->asoc.refcnt, 1);
2389 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2390 SCTP_TCB_UNLOCK(stcb);
2391 SCTP_SOCKET_LOCK(so, 1);
2392 SCTP_TCB_LOCK(stcb);
2393 #endif
2394 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_19);
2395 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2396 SCTP_SOCKET_UNLOCK(so, 1);
2397 #endif
2398 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2399 return (NULL);
2400 }
2401
2402 /* set up to notify upper layer */
2403 *notification = SCTP_NOTIFY_ASSOC_UP;
2404 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2405 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2406 (inp->sctp_socket->so_qlimit == 0)) {
2407 /*
2408 * This is an endpoint that called connect() how it got a
2409 * cookie that is NEW is a bit of a mystery. It must be that
2410 * the INIT was sent, but before it got there.. a complete
2411 * INIT/INIT-ACK/COOKIE arrived. But of course then it
2412 * should have went to the other code.. not here.. oh well..
2413 * a bit of protection is worth having..
2414 */
2415 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2416 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2417 atomic_add_int(&stcb->asoc.refcnt, 1);
2418 SCTP_TCB_UNLOCK(stcb);
2419 SCTP_SOCKET_LOCK(so, 1);
2420 SCTP_TCB_LOCK(stcb);
2421 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2422 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2423 SCTP_SOCKET_UNLOCK(so, 1);
2424 return (NULL);
2425 }
2426 #endif
2427 soisconnected(stcb->sctp_socket);
2428 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2429 SCTP_SOCKET_UNLOCK(so, 1);
2430 #endif
2431 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2432 (inp->sctp_socket->so_qlimit)) {
2433 /*
2434 * We don't want to do anything with this one. Since it is
2435 * the listening guy. The timer will get started for
2436 * accepted connections in the caller.
2437 */
2438 ;
2439 }
2440 /* since we did not send a HB make sure we don't double things */
2441 if ((netp) && (*netp))
2442 (*netp)->hb_responded = 1;
2443
2444 if (stcb->asoc.sctp_autoclose_ticks &&
2445 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2446 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2447 }
2448 /* calculate the RTT */
2449 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2450 if ((netp) && (*netp)) {
2451 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2452 &cookie->time_entered, sctp_align_unsafe_makecopy,
2453 SCTP_RTT_FROM_NON_DATA);
2454 }
2455 /* respond with a COOKIE-ACK */
2456 sctp_send_cookie_ack(stcb);
2457
2458 /*
2459 * check the address lists for any ASCONFs that need to be sent
2460 * AFTER the cookie-ack is sent
2461 */
2462 sctp_check_address_list(stcb, m,
2463 initack_offset + sizeof(struct sctp_init_ack_chunk),
2464 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2465 initack_src, cookie->local_scope, cookie->site_scope,
2466 cookie->ipv4_scope, cookie->loopback_scope);
2467
2468
2469 return (stcb);
2470 }
2471
2472 /*
2473 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2474 * we NEED to make sure we are not already using the vtag. If so we
2475 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2476 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2477 SCTP_BASE_INFO(hashasocmark))];
2478 LIST_FOREACH(stcb, head, sctp_asocs) {
2479 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) {
2480 -- SEND ABORT - TRY AGAIN --
2481 }
2482 }
2483 */
2484
2485 /*
2486 * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2487 * existing (non-NULL) TCB
2488 */
2489 static struct mbuf *
2490 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2491 struct sockaddr *src, struct sockaddr *dst,
2492 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2493 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2494 int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2495 struct sctp_tcb **locked_tcb,
2496 #if defined(__FreeBSD__)
2497 uint8_t use_mflowid, uint32_t mflowid,
2498 #endif
2499 uint32_t vrf_id, uint16_t port)
2500 {
2501 struct sctp_state_cookie *cookie;
2502 struct sctp_tcb *l_stcb = *stcb;
2503 struct sctp_inpcb *l_inp;
2504 struct sockaddr *to;
2505 struct sctp_pcb *ep;
2506 struct mbuf *m_sig;
2507 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2508 uint8_t *sig;
2509 uint8_t cookie_ok = 0;
2510 unsigned int sig_offset, cookie_offset;
2511 unsigned int cookie_len;
2512 struct timeval now;
2513 struct timeval time_expires;
2514 int notification = 0;
2515 struct sctp_nets *netl;
2516 int had_a_existing_tcb = 0;
2517 int send_int_conf = 0;
2518 #ifdef INET
2519 struct sockaddr_in sin;
2520 #endif
2521 #ifdef INET6
2522 struct sockaddr_in6 sin6;
2523 #endif
2524 #if defined(__Userspace__)
2525 struct sockaddr_conn sconn;
2526 #endif
2527
2528 SCTPDBG(SCTP_DEBUG_INPUT2,
2529 "sctp_handle_cookie: handling COOKIE-ECHO\n");
2530
2531 if (inp_p == NULL) {
2532 return (NULL);
2533 }
2534 cookie = &cp->cookie;
2535 cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2536 cookie_len = ntohs(cp->ch.chunk_length);
2537
2538 if ((cookie->peerport != sh->src_port) &&
2539 (cookie->myport != sh->dest_port) &&
2540 (cookie->my_vtag != sh->v_tag)) {
2541 /*
2542 * invalid ports or bad tag. Note that we always leave the
2543 * v_tag in the header in network order and when we stored
2544 * it in the my_vtag slot we also left it in network order.
2545 * This maintains the match even though it may be in the
2546 * opposite byte order of the machine :->
2547 */
2548 return (NULL);
2549 }
2550 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2551 sizeof(struct sctp_init_chunk) +
2552 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2553 /* cookie too small */
2554 return (NULL);
2555 }
2556 /*
2557 * split off the signature into its own mbuf (since it should not be
2558 * calculated in the sctp_hmac_m() call).
2559 */
2560 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2561 m_sig = m_split(m, sig_offset, M_NOWAIT);
2562 if (m_sig == NULL) {
2563 /* out of memory or ?? */
2564 return (NULL);
2565 }
2566 #ifdef SCTP_MBUF_LOGGING
2567 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2568 struct mbuf *mat;
2569
2570 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) {
2571 if (SCTP_BUF_IS_EXTENDED(mat)) {
2572 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2573 }
2574 }
2575 }
2576 #endif
2577
2578 /*
2579 * compute the signature/digest for the cookie
2580 */
2581 ep = &(*inp_p)->sctp_ep;
2582 l_inp = *inp_p;
2583 if (l_stcb) {
2584 SCTP_TCB_UNLOCK(l_stcb);
2585 }
2586 SCTP_INP_RLOCK(l_inp);
2587 if (l_stcb) {
2588 SCTP_TCB_LOCK(l_stcb);
2589 }
2590 /* which cookie is it? */
2591 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2592 (ep->current_secret_number != ep->last_secret_number)) {
2593 /* it's the old cookie */
2594 (void)sctp_hmac_m(SCTP_HMAC,
2595 (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2596 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2597 } else {
2598 /* it's the current cookie */
2599 (void)sctp_hmac_m(SCTP_HMAC,
2600 (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2601 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2602 }
2603 /* get the signature */
2604 SCTP_INP_RUNLOCK(l_inp);
2605 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2606 if (sig == NULL) {
2607 /* couldn't find signature */
2608 sctp_m_freem(m_sig);
2609 return (NULL);
2610 }
2611 /* compare the received digest with the computed digest */
2612 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2613 /* try the old cookie? */
2614 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2615 (ep->current_secret_number != ep->last_secret_number)) {
2616 /* compute digest with old */
2617 (void)sctp_hmac_m(SCTP_HMAC,
2618 (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2619 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2620 /* compare */
2621 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2622 cookie_ok = 1;
2623 }
2624 } else {
2625 cookie_ok = 1;
2626 }
2627
2628 /*
2629 * Now before we continue we must reconstruct our mbuf so that
2630 * normal processing of any other chunks will work.
2631 */
2632 {
2633 struct mbuf *m_at;
2634
2635 m_at = m;
2636 while (SCTP_BUF_NEXT(m_at) != NULL) {
2637 m_at = SCTP_BUF_NEXT(m_at);
2638 }
2639 SCTP_BUF_NEXT(m_at) = m_sig;
2640 }
2641
2642 if (cookie_ok == 0) {
2643 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2644 SCTPDBG(SCTP_DEBUG_INPUT2,
2645 "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2646 (uint32_t) offset, cookie_offset, sig_offset);
2647 return (NULL);
2648 }
2649
2650 /*
2651 * check the cookie timestamps to be sure it's not stale
2652 */
2653 (void)SCTP_GETTIME_TIMEVAL(&now);
2654 /* Expire time is in Ticks, so we convert to seconds */
2655 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2656 time_expires.tv_usec = cookie->time_entered.tv_usec;
2657 /* TODO sctp_constants.h needs alternative time macros when
2658 * _KERNEL is undefined.
2659 */
2660 #ifndef __FreeBSD__
2661 if (timercmp(&now, &time_expires, >))
2662 #else
2663 if (timevalcmp(&now, &time_expires, >))
2664 #endif
2665 {
2666 /* cookie is stale! */
2667 struct mbuf *op_err;
2668 struct sctp_stale_cookie_msg *scm;
2669 uint32_t tim;
2670 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2671 0, M_NOWAIT, 1, MT_DATA);
2672 if (op_err == NULL) {
2673 /* FOOBAR */
2674 return (NULL);
2675 }
2676 /* Set the len */
2677 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2678 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2679 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2680 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2681 (sizeof(uint32_t))));
2682 /* seconds to usec */
2683 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2684 /* add in usec */
2685 if (tim == 0)
2686 tim = now.tv_usec - cookie->time_entered.tv_usec;
2687 scm->time_usec = htonl(tim);
2688 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2689 #if defined(__FreeBSD__)
2690 use_mflowid, mflowid,
2691 #endif
2692 vrf_id, port);
2693 return (NULL);
2694 }
2695 /*
2696 * Now we must see with the lookup address if we have an existing
2697 * asoc. This will only happen if we were in the COOKIE-WAIT state
2698 * and a INIT collided with us and somewhere the peer sent the
2699 * cookie on another address besides the single address our assoc
2700 * had for him. In this case we will have one of the tie-tags set at
2701 * least AND the address field in the cookie can be used to look it
2702 * up.
2703 */
2704 to = NULL;
2705 switch (cookie->addr_type) {
2706 #ifdef INET6
2707 case SCTP_IPV6_ADDRESS:
2708 memset(&sin6, 0, sizeof(sin6));
2709 sin6.sin6_family = AF_INET6;
2710 #ifdef HAVE_SIN6_LEN
2711 sin6.sin6_len = sizeof(sin6);
2712 #endif
2713 sin6.sin6_port = sh->src_port;
2714 sin6.sin6_scope_id = cookie->scope_id;
2715 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2716 sizeof(sin6.sin6_addr.s6_addr));
2717 to = (struct sockaddr *)&sin6;
2718 break;
2719 #endif
2720 #ifdef INET
2721 case SCTP_IPV4_ADDRESS:
2722 memset(&sin, 0, sizeof(sin));
2723 sin.sin_family = AF_INET;
2724 #ifdef HAVE_SIN_LEN
2725 sin.sin_len = sizeof(sin);
2726 #endif
2727 sin.sin_port = sh->src_port;
2728 sin.sin_addr.s_addr = cookie->address[0];
2729 to = (struct sockaddr *)&sin;
2730 break;
2731 #endif
2732 #if defined(__Userspace__)
2733 case SCTP_CONN_ADDRESS:
2734 memset(&sconn, 0, sizeof(struct sockaddr_conn));
2735 sconn.sconn_family = AF_CONN;
2736 #ifdef HAVE_SCONN_LEN
2737 sconn.sconn_len = sizeof(struct sockaddr_conn);
2738 #endif
2739 sconn.sconn_port = sh->src_port;
2740 memcpy(&sconn.sconn_addr, cookie->address, sizeof(void *));
2741 to = (struct sockaddr *)&sconn;
2742 break;
2743 #endif
2744 default:
2745 /* This should not happen */
2746 return (NULL);
2747 }
2748 if ((*stcb == NULL) && to) {
2749 /* Yep, lets check */
2750 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2751 if (*stcb == NULL) {
2752 /*
2753 * We should have only got back the same inp. If we
2754 * got back a different ep we have a problem. The
2755 * original findep got back l_inp and now
2756 */
2757 if (l_inp != *inp_p) {
2758 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2759 }
2760 } else {
2761 if (*locked_tcb == NULL) {
2762 /* In this case we found the assoc only
2763 * after we locked the create lock. This means
2764 * we are in a colliding case and we must make
2765 * sure that we unlock the tcb if its one of the
2766 * cases where we throw away the incoming packets.
2767 */
2768 *locked_tcb = *stcb;
2769
2770 /* We must also increment the inp ref count
2771 * since the ref_count flags was set when we
2772 * did not find the TCB, now we found it which
2773 * reduces the refcount.. we must raise it back
2774 * out to balance it all :-)
2775 */
2776 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2777 if ((*stcb)->sctp_ep != l_inp) {
2778 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2779 (void *)(*stcb)->sctp_ep, (void *)l_inp);
2780 }
2781 }
2782 }
2783 }
2784 if (to == NULL) {
2785 return (NULL);
2786 }
2787
2788 cookie_len -= SCTP_SIGNATURE_SIZE;
2789 if (*stcb == NULL) {
2790 /* this is the "normal" case... get a new TCB */
2791 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2792 cookie, cookie_len, *inp_p,
2793 netp, to, &notification,
2794 auth_skipped, auth_offset, auth_len,
2795 #if defined(__FreeBSD__)
2796 use_mflowid, mflowid,
2797 #endif
2798 vrf_id, port);
2799 } else {
2800 /* this is abnormal... cookie-echo on existing TCB */
2801 had_a_existing_tcb = 1;
2802 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2803 src, dst, sh,
2804 cookie, cookie_len, *inp_p, *stcb, netp, to,
2805 &notification, auth_skipped, auth_offset, auth_len,
2806 #if defined(__FreeBSD__)
2807 use_mflowid, mflowid,
2808 #endif
2809 vrf_id, port);
2810 }
2811
2812 if (*stcb == NULL) {
2813 /* still no TCB... must be bad cookie-echo */
2814 return (NULL);
2815 }
2816 #if defined(__FreeBSD__)
2817 if ((*netp != NULL) && (use_mflowid != 0)) {
2818 (*netp)->flowid = mflowid;
2819 #ifdef INVARIANTS
2820 (*netp)->flowidset = 1;
2821 #endif
2822 }
2823 #endif
2824 /*
2825 * Ok, we built an association so confirm the address we sent the
2826 * INIT-ACK to.
2827 */
2828 netl = sctp_findnet(*stcb, to);
2829 /*
2830 * This code should in theory NOT run but
2831 */
2832 if (netl == NULL) {
2833 /* TSNH! Huh, why do I need to add this address here? */
2834 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2835 return (NULL);
2836 }
2837 netl = sctp_findnet(*stcb, to);
2838 }
2839 if (netl) {
2840 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2841 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2842 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2843 netl);
2844 send_int_conf = 1;
2845 }
2846 }
2847 sctp_start_net_timers(*stcb);
2848 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2849 if (!had_a_existing_tcb ||
2850 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2851 /*
2852 * If we have a NEW cookie or the connect never
2853 * reached the connected state during collision we
2854 * must do the TCP accept thing.
2855 */
2856 struct socket *so, *oso;
2857 struct sctp_inpcb *inp;
2858
2859 if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2860 /*
2861 * For a restart we will keep the same
2862 * socket, no need to do anything. I THINK!!
2863 */
2864 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2865 if (send_int_conf) {
2866 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2867 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2868 }
2869 return (m);
2870 }
2871 oso = (*inp_p)->sctp_socket;
2872 #if (defined(__FreeBSD__) && __FreeBSD_version < 700000)
2873 /*
2874 * We do this to keep the sockets side happy during
2875 * the sonewcon ONLY.
2876 */
2877 NET_LOCK_GIANT();
2878 #endif
2879 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2880 SCTP_TCB_UNLOCK((*stcb));
2881 #if defined(__FreeBSD__) && __FreeBSD_version >= 801000
2882 CURVNET_SET(oso->so_vnet);
2883 #endif
2884 #if defined(__APPLE__)
2885 SCTP_SOCKET_LOCK(oso, 1);
2886 #endif
2887 so = sonewconn(oso, 0
2888 #if defined(__APPLE__)
2889 ,NULL
2890 #endif
2891 #ifdef __Panda__
2892 ,NULL , (*inp_p)->def_vrf_id
2893 #endif
2894 );
2895 #if (defined(__FreeBSD__) && __FreeBSD_version < 700000)
2896 NET_UNLOCK_GIANT();
2897 #endif
2898 #if defined(__APPLE__)
2899 SCTP_SOCKET_UNLOCK(oso, 1);
2900 #endif
2901 #if defined(__FreeBSD__) && __FreeBSD_version >= 801000
2902 CURVNET_RESTORE();
2903 #endif
2904 SCTP_TCB_LOCK((*stcb));
2905 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2906
2907 if (so == NULL) {
2908 struct mbuf *op_err;
2909 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2910 struct socket *pcb_so;
2911 #endif
2912 /* Too many sockets */
2913 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2914 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2915 sctp_abort_association(*inp_p, NULL, m, iphlen,
2916 src, dst, sh, op_err,
2917 #if defined(__FreeBSD__)
2918 use_mflowid, mflowid,
2919 #endif
2920 vrf_id, port);
2921 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2922 pcb_so = SCTP_INP_SO(*inp_p);
2923 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2924 SCTP_TCB_UNLOCK((*stcb));
2925 SCTP_SOCKET_LOCK(pcb_so, 1);
2926 SCTP_TCB_LOCK((*stcb));
2927 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2928 #endif
2929 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_20);
2930 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2931 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2932 #endif
2933 return (NULL);
2934 }
2935 inp = (struct sctp_inpcb *)so->so_pcb;
2936 SCTP_INP_INCR_REF(inp);
2937 /*
2938 * We add the unbound flag here so that
2939 * if we get an soabort() before we get the
2940 * move_pcb done, we will properly cleanup.
2941 */
2942 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2943 SCTP_PCB_FLAGS_CONNECTED |
2944 SCTP_PCB_FLAGS_IN_TCPPOOL |
2945 SCTP_PCB_FLAGS_UNBOUND |
2946 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2947 SCTP_PCB_FLAGS_DONT_WAKE);
2948 inp->sctp_features = (*inp_p)->sctp_features;
2949 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2950 inp->sctp_socket = so;
2951 inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2952 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2953 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable;
2954 inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2955 inp->sctp_context = (*inp_p)->sctp_context;
2956 inp->local_strreset_support = (*inp_p)->local_strreset_support;
2957 inp->inp_starting_point_for_iterator = NULL;
2958 #if defined(__Userspace__)
2959 inp->ulp_info = (*inp_p)->ulp_info;
2960 inp->recv_callback = (*inp_p)->recv_callback;
2961 inp->send_callback = (*inp_p)->send_callback;
2962 inp->send_sb_threshold = (*inp_p)->send_sb_threshold;
2963 #endif
2964 /*
2965 * copy in the authentication parameters from the
2966 * original endpoint
2967 */
2968 if (inp->sctp_ep.local_hmacs)
2969 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2970 inp->sctp_ep.local_hmacs =
2971 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2972 if (inp->sctp_ep.local_auth_chunks)
2973 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2974 inp->sctp_ep.local_auth_chunks =
2975 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2976
2977 /*
2978 * Now we must move it from one hash table to
2979 * another and get the tcb in the right place.
2980 */
2981
2982 /* This is where the one-2-one socket is put into
2983 * the accept state waiting for the accept!
2984 */
2985 if (*stcb) {
2986 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2987 }
2988 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2989
2990 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2991 SCTP_TCB_UNLOCK((*stcb));
2992
2993 #if defined(__FreeBSD__)
2994 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2995 0);
2996 #else
2997 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, M_NOWAIT);
2998 #endif
2999 SCTP_TCB_LOCK((*stcb));
3000 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
3001
3002
3003 /* now we must check to see if we were aborted while
3004 * the move was going on and the lock/unlock happened.
3005 */
3006 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
3007 /* yep it was, we leave the
3008 * assoc attached to the socket since
3009 * the sctp_inpcb_free() call will send
3010 * an abort for us.
3011 */
3012 SCTP_INP_DECR_REF(inp);
3013 return (NULL);
3014 }
3015 SCTP_INP_DECR_REF(inp);
3016 /* Switch over to the new guy */
3017 *inp_p = inp;
3018 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3019 if (send_int_conf) {
3020 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
3021 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
3022 }
3023
3024 /* Pull it from the incomplete queue and wake the guy */
3025 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3026 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
3027 SCTP_TCB_UNLOCK((*stcb));
3028 SCTP_SOCKET_LOCK(so, 1);
3029 #endif
3030 soisconnected(so);
3031 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3032 SCTP_TCB_LOCK((*stcb));
3033 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
3034 SCTP_SOCKET_UNLOCK(so, 1);
3035 #endif
3036 return (m);
3037 }
3038 }
3039 if (notification) {
3040 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3041 }
3042 if (send_int_conf) {
3043 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
3044 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
3045 }
3046 return (m);
3047 }
3048
3049 static void
3050 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
3051 struct sctp_tcb *stcb, struct sctp_nets *net)
3052 {
3053 /* cp must not be used, others call this without a c-ack :-) */
3054 struct sctp_association *asoc;
3055
3056 SCTPDBG(SCTP_DEBUG_INPUT2,
3057 "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
3058 if (stcb == NULL)
3059 return;
3060
3061 asoc = &stcb->asoc;
3062
3063 sctp_stop_all_cookie_timers(stcb);
3064 /* process according to association state */
3065 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
3066 /* state change only needed when I am in right state */
3067 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
3068 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
3069 sctp_start_net_timers(stcb);
3070 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
3071 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
3072 stcb->sctp_ep, stcb, asoc->primary_destination);
3073
3074 }
3075 /* update RTO */
3076 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
3077 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
3078 if (asoc->overall_error_count == 0) {
3079 net->RTO = sctp_calculate_rto(stcb, asoc, net,
3080 &asoc->time_entered, sctp_align_safe_nocopy,
3081 SCTP_RTT_FROM_NON_DATA);
3082 }
3083 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
3084 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3085 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
3086 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
3087 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3088 struct socket *so;
3089
3090 #endif
3091 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
3092 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3093 so = SCTP_INP_SO(stcb->sctp_ep);
3094 atomic_add_int(&stcb->asoc.refcnt, 1);
3095 SCTP_TCB_UNLOCK(stcb);
3096 SCTP_SOCKET_LOCK(so, 1);
3097 SCTP_TCB_LOCK(stcb);
3098 atomic_subtract_int(&stcb->asoc.refcnt, 1);
3099 #endif
3100 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
3101 soisconnected(stcb->sctp_socket);
3102 }
3103 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3104 SCTP_SOCKET_UNLOCK(so, 1);
3105 #endif
3106 }
3107 /*
3108 * since we did not send a HB make sure we don't double
3109 * things
3110 */
3111 net->hb_responded = 1;
3112
3113 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
3114 /* We don't need to do the asconf thing,
3115 * nor hb or autoclose if the socket is closed.
3116 */
3117 goto closed_socket;
3118 }
3119
3120 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
3121 stcb, net);
3122
3123
3124 if (stcb->asoc.sctp_autoclose_ticks &&
3125 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
3126 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
3127 stcb->sctp_ep, stcb, NULL);
3128 }
3129 /*
3130 * send ASCONF if parameters are pending and ASCONFs are
3131 * allowed (eg. addresses changed when init/cookie echo were
3132 * in flight)
3133 */
3134 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
3135 (stcb->asoc.peer_supports_asconf) &&
3136 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
3137 #ifdef SCTP_TIMER_BASED_ASCONF
3138 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
3139 stcb->sctp_ep, stcb,
3140 stcb->asoc.primary_destination);
3141 #else
3142 sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3143 SCTP_ADDR_NOT_LOCKED);
3144 #endif
3145 }
3146 }
3147 closed_socket:
3148 /* Toss the cookie if I can */
3149 sctp_toss_old_cookies(stcb, asoc);
3150 if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3151 /* Restart the timer if we have pending data */
3152 struct sctp_tmit_chunk *chk;
3153
3154 chk = TAILQ_FIRST(&asoc->sent_queue);
3155 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3156 }
3157 }
3158
3159 static void
3160 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3161 struct sctp_tcb *stcb)
3162 {
3163 struct sctp_nets *net;
3164 struct sctp_tmit_chunk *lchk;
3165 struct sctp_ecne_chunk bkup;
3166 uint8_t override_bit;
3167 uint32_t tsn, window_data_tsn;
3168 int len;
3169 unsigned int pkt_cnt;
3170
3171 len = ntohs(cp->ch.chunk_length);
3172 if ((len != sizeof(struct sctp_ecne_chunk)) &&
3173 (len != sizeof(struct old_sctp_ecne_chunk))) {
3174 return;
3175 }
3176 if (len == sizeof(struct old_sctp_ecne_chunk)) {
3177 /* Its the old format */
3178 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3179 bkup.num_pkts_since_cwr = htonl(1);
3180 cp = &bkup;
3181 }
3182 SCTP_STAT_INCR(sctps_recvecne);
3183 tsn = ntohl(cp->tsn);
3184 pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3185 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3186 if (lchk == NULL) {
3187 window_data_tsn = stcb->asoc.sending_seq - 1;
3188 } else {
3189 window_data_tsn = lchk->rec.data.TSN_seq;
3190 }
3191
3192 /* Find where it was sent to if possible. */
3193 net = NULL;
3194 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3195 if (lchk->rec.data.TSN_seq == tsn) {
3196 net = lchk->whoTo;
3197 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3198 break;
3199 }
3200 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3201 break;
3202 }
3203 }
3204 if (net == NULL) {
3205 /*
3206 * What to do. A previous send of a
3207 * CWR was possibly lost. See how old it is, we
3208 * may have it marked on the actual net.
3209 */
3210 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3211 if (tsn == net->last_cwr_tsn) {
3212 /* Found him, send it off */
3213 break;
3214 }
3215 }
3216 if (net == NULL) {
3217 /*
3218 * If we reach here, we need to send a special
3219 * CWR that says hey, we did this a long time
3220 * ago and you lost the response.
3221 */
3222 net = TAILQ_FIRST(&stcb->asoc.nets);
3223 if (net == NULL) {
3224 /* TSNH */
3225 return;
3226 }
3227 override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3228 } else {
3229 override_bit = 0;
3230 }
3231 } else {
3232 override_bit = 0;
3233 }
3234 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3235 ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3236 /* JRS - Use the congestion control given in the pluggable CC module */
3237 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3238 /*
3239 * We reduce once every RTT. So we will only lower cwnd at
3240 * the next sending seq i.e. the window_data_tsn
3241 */
3242 net->cwr_window_tsn = window_data_tsn;
3243 net->ecn_ce_pkt_cnt += pkt_cnt;
3244 net->lost_cnt = pkt_cnt;
3245 net->last_cwr_tsn = tsn;
3246 } else {
3247 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3248 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3249 ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3250 /*
3251 * Another loss in the same window update how
3252 * many marks/packets lost we have had.
3253 */
3254 int cnt = 1;
3255 if (pkt_cnt > net->lost_cnt) {
3256 /* Should be the case */
3257 cnt = (pkt_cnt - net->lost_cnt);
3258 net->ecn_ce_pkt_cnt += cnt;
3259 }
3260 net->lost_cnt = pkt_cnt;
3261 net->last_cwr_tsn = tsn;
3262 /*
3263 * Most CC functions will ignore this call, since we are in-window
3264 * yet of the initial CE the peer saw.
3265 */
3266 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3267 }
3268 }
3269 /*
3270 * We always send a CWR this way if our previous one was lost our
3271 * peer will get an update, or if it is not time again to reduce we
3272 * still get the cwr to the peer. Note we set the override when we
3273 * could not find the TSN on the chunk or the destination network.
3274 */
3275 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3276 }
3277
3278 static void
3279 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3280 {
3281 /*
3282 * Here we get a CWR from the peer. We must look in the outqueue and
3283 * make sure that we have a covered ECNE in the control chunk part.
3284 * If so remove it.
3285 */
3286 struct sctp_tmit_chunk *chk;
3287 struct sctp_ecne_chunk *ecne;
3288 int override;
3289 uint32_t cwr_tsn;
3290 cwr_tsn = ntohl(cp->tsn);
3291
3292 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3293 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3294 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3295 continue;
3296 }
3297 if ((override == 0) && (chk->whoTo != net)) {
3298 /* Must be from the right src unless override is set */
3299 continue;
3300 }
3301 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3302 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3303 /* this covers this ECNE, we can remove it */
3304 stcb->asoc.ecn_echo_cnt_onq--;
3305 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3306 sctp_next);
3307 if (chk->data) {
3308 sctp_m_freem(chk->data);
3309 chk->data = NULL;
3310 }
3311 stcb->asoc.ctrl_queue_cnt--;
3312 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3313 if (override == 0) {
3314 break;
3315 }
3316 }
3317 }
3318 }
3319
3320 static void
3321 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3322 struct sctp_tcb *stcb, struct sctp_nets *net)
3323 {
3324 struct sctp_association *asoc;
3325 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3326 struct socket *so;
3327 #endif
3328
3329 SCTPDBG(SCTP_DEBUG_INPUT2,
3330 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3331 if (stcb == NULL)
3332 return;
3333
3334 asoc = &stcb->asoc;
3335 /* process according to association state */
3336 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3337 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3338 SCTPDBG(SCTP_DEBUG_INPUT2,
3339 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3340 SCTP_TCB_UNLOCK(stcb);
3341 return;
3342 }
3343 /* notify upper layer protocol */
3344 if (stcb->sctp_socket) {
3345 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3346 }
3347 #ifdef INVARIANTS
3348 if (!TAILQ_EMPTY(&asoc->send_queue) ||
3349 !TAILQ_EMPTY(&asoc->sent_queue) ||
3350 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3351 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3352 }
3353 #endif
3354 /* stop the timer */
3355 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_22);
3356 SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3357 /* free the TCB */
3358 SCTPDBG(SCTP_DEBUG_INPUT2,
3359 "sctp_handle_shutdown_complete: calls free-asoc\n");
3360 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3361 so = SCTP_INP_SO(stcb->sctp_ep);
3362 atomic_add_int(&stcb->asoc.refcnt, 1);
3363 SCTP_TCB_UNLOCK(stcb);
3364 SCTP_SOCKET_LOCK(so, 1);
3365 SCTP_TCB_LOCK(stcb);
3366 atomic_subtract_int(&stcb->asoc.refcnt, 1);
3367 #endif
3368 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_23);
3369 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3370 SCTP_SOCKET_UNLOCK(so, 1);
3371 #endif
3372 return;
3373 }
3374
3375 static int
3376 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3377 struct sctp_nets *net, uint8_t flg)
3378 {
3379 switch (desc->chunk_type) {
3380 case SCTP_DATA:
3381 /* find the tsn to resend (possibly */
3382 {
3383 uint32_t tsn;
3384 struct sctp_tmit_chunk *tp1;
3385
3386 tsn = ntohl(desc->tsn_ifany);
3387 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3388 if (tp1->rec.data.TSN_seq == tsn) {
3389 /* found it */
3390 break;
3391 }
3392 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3393 /* not found */
3394 tp1 = NULL;
3395 break;
3396 }
3397 }
3398 if (tp1 == NULL) {
3399 /*
3400 * Do it the other way , aka without paying
3401 * attention to queue seq order.
3402 */
3403 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3404 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3405 if (tp1->rec.data.TSN_seq == tsn) {
3406 /* found it */
3407 break;
3408 }
3409 }
3410 }
3411 if (tp1 == NULL) {
3412 SCTP_STAT_INCR(sctps_pdrptsnnf);
3413 }
3414 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3415 uint8_t *ddp;
3416
3417 if (((flg & SCTP_BADCRC) == 0) &&
3418 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3419 return (0);
3420 }
3421 if ((stcb->asoc.peers_rwnd == 0) &&
3422 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3423 SCTP_STAT_INCR(sctps_pdrpdiwnp);
3424 return (0);
3425 }
3426 if (stcb->asoc.peers_rwnd == 0 &&
3427 (flg & SCTP_FROM_MIDDLE_BOX)) {
3428 SCTP_STAT_INCR(sctps_pdrpdizrw);
3429 return (0);
3430 }
3431 ddp = (uint8_t *) (mtod(tp1->data, caddr_t) +
3432 sizeof(struct sctp_data_chunk));
3433 {
3434 unsigned int iii;
3435
3436 for (iii = 0; iii < sizeof(desc->data_bytes);
3437 iii++) {
3438 if (ddp[iii] != desc->data_bytes[iii]) {
3439 SCTP_STAT_INCR(sctps_pdrpbadd);
3440 return (-1);
3441 }
3442 }
3443 }
3444
3445 if (tp1->do_rtt) {
3446 /*
3447 * this guy had a RTO calculation
3448 * pending on it, cancel it
3449 */
3450 if (tp1->whoTo->rto_needed == 0) {
3451 tp1->whoTo->rto_needed = 1;
3452 }
3453 tp1->do_rtt = 0;
3454 }
3455 SCTP_STAT_INCR(sctps_pdrpmark);
3456 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3457 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3458 /*
3459 * mark it as if we were doing a FR, since
3460 * we will be getting gap ack reports behind
3461 * the info from the router.
3462 */
3463 tp1->rec.data.doing_fast_retransmit = 1;
3464 /*
3465 * mark the tsn with what sequences can
3466 * cause a new FR.
3467 */
3468 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3469 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3470 } else {
3471 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3472 }
3473
3474 /* restart the timer */
3475 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3476 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT+SCTP_LOC_24);
3477 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3478 stcb, tp1->whoTo);
3479
3480 /* fix counts and things */
3481 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3482 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3483 tp1->whoTo->flight_size,
3484 tp1->book_size,
3485 (uintptr_t)stcb,
3486 tp1->rec.data.TSN_seq);
3487 }
3488 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3489 sctp_flight_size_decrease(tp1);
3490 sctp_total_flight_decrease(stcb, tp1);
3491 }
3492 tp1->sent = SCTP_DATAGRAM_RESEND;
3493 } {
3494 /* audit code */
3495 unsigned int audit;
3496
3497 audit = 0;
3498 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3499 if (tp1->sent == SCTP_DATAGRAM_RESEND)
3500 audit++;
3501 }
3502 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3503 sctp_next) {
3504 if (tp1->sent == SCTP_DATAGRAM_RESEND)
3505 audit++;
3506 }
3507 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3508 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3509 audit, stcb->asoc.sent_queue_retran_cnt);
3510 #ifndef SCTP_AUDITING_ENABLED
3511 stcb->asoc.sent_queue_retran_cnt = audit;
3512 #endif
3513 }
3514 }
3515 }
3516 break;
3517 case SCTP_ASCONF:
3518 {
3519 struct sctp_tmit_chunk *asconf;
3520
3521 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3522 sctp_next) {
3523 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3524 break;
3525 }
3526 }
3527 if (asconf) {
3528 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3529 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3530 asconf->sent = SCTP_DATAGRAM_RESEND;
3531 asconf->snd_count--;
3532 }
3533 }
3534 break;
3535 case SCTP_INITIATION:
3536 /* resend the INIT */
3537 stcb->asoc.dropped_special_cnt++;
3538 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3539 /*
3540 * If we can get it in, in a few attempts we do
3541 * this, otherwise we let the timer fire.
3542 */
3543 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3544 stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_25);
3545 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3546 }
3547 break;
3548 case SCTP_SELECTIVE_ACK:
3549 case SCTP_NR_SELECTIVE_ACK:
3550 /* resend the sack */
3551 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3552 break;
3553 case SCTP_HEARTBEAT_REQUEST:
3554 /* resend a demand HB */
3555 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3556 /* Only retransmit if we KNOW we wont destroy the tcb */
3557 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3558 }
3559 break;
3560 case SCTP_SHUTDOWN:
3561 sctp_send_shutdown(stcb, net);
3562 break;
3563 case SCTP_SHUTDOWN_ACK:
3564 sctp_send_shutdown_ack(stcb, net);
3565 break;
3566 case SCTP_COOKIE_ECHO:
3567 {
3568 struct sctp_tmit_chunk *cookie;
3569
3570 cookie = NULL;
3571 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3572 sctp_next) {
3573 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3574 break;
3575 }
3576 }
3577 if (cookie) {
3578 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3579 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3580 cookie->sent = SCTP_DATAGRAM_RESEND;
3581 sctp_stop_all_cookie_timers(stcb);
3582 }
3583 }
3584 break;
3585 case SCTP_COOKIE_ACK:
3586 sctp_send_cookie_ack(stcb);
3587 break;
3588 case SCTP_ASCONF_ACK:
3589 /* resend last asconf ack */
3590 sctp_send_asconf_ack(stcb);
3591 break;
3592 case SCTP_FORWARD_CUM_TSN:
3593 send_forward_tsn(stcb, &stcb->asoc);
3594 break;
3595 /* can't do anything with these */
3596 case SCTP_PACKET_DROPPED:
3597 case SCTP_INITIATION_ACK: /* this should not happen */
3598 case SCTP_HEARTBEAT_ACK:
3599 case SCTP_ABORT_ASSOCIATION:
3600 case SCTP_OPERATION_ERROR:
3601 case SCTP_SHUTDOWN_COMPLETE:
3602 case SCTP_ECN_ECHO:
3603 case SCTP_ECN_CWR:
3604 default:
3605 break;
3606 }
3607 return (0);
3608 }
3609
3610 void
3611 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3612 {
3613 uint32_t i;
3614 uint16_t temp;
3615
3616 /*
3617 * We set things to 0xffff since this is the last delivered sequence
3618 * and we will be sending in 0 after the reset.
3619 */
3620
3621 if (number_entries) {
3622 for (i = 0; i < number_entries; i++) {
3623 temp = ntohs(list[i]);
3624 if (temp >= stcb->asoc.streamincnt) {
3625 continue;
3626 }
3627 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3628 }
3629 } else {
3630 list = NULL;
3631 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3632 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3633 }
3634 }
3635 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3636 }
3637
3638 static void
3639 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3640 {
3641 uint32_t i;
3642 uint16_t temp;
3643
3644 if (number_entries > 0) {
3645 for (i = 0; i < number_entries; i++) {
3646 temp = ntohs(list[i]);
3647 if (temp >= stcb->asoc.streamoutcnt) {
3648 /* no such stream */
3649 continue;
3650 }
3651 stcb->asoc.strmout[temp].next_sequence_send = 0;
3652 }
3653 } else {
3654 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3655 stcb->asoc.strmout[i].next_sequence_send = 0;
3656 }
3657 }
3658 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3659 }
3660
3661
3662 struct sctp_stream_reset_out_request *
3663 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3664 {
3665 struct sctp_association *asoc;
3666 struct sctp_chunkhdr *ch;
3667 struct sctp_stream_reset_out_request *r;
3668 struct sctp_tmit_chunk *chk;
3669 int len, clen;
3670
3671 asoc = &stcb->asoc;
3672 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3673 asoc->stream_reset_outstanding = 0;
3674 return (NULL);
3675 }
3676 if (stcb->asoc.str_reset == NULL) {
3677 asoc->stream_reset_outstanding = 0;
3678 return (NULL);
3679 }
3680 chk = stcb->asoc.str_reset;
3681 if (chk->data == NULL) {
3682 return (NULL);
3683 }
3684 if (bchk) {
3685 /* he wants a copy of the chk pointer */
3686 *bchk = chk;
3687 }
3688 clen = chk->send_size;
3689 ch = mtod(chk->data, struct sctp_chunkhdr *);
3690 r = (struct sctp_stream_reset_out_request *)(ch + 1);
3691 if (ntohl(r->request_seq) == seq) {
3692 /* found it */
3693 return (r);
3694 }
3695 len = SCTP_SIZE32(ntohs(r->ph.param_length));
3696 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3697 /* move to the next one, there can only be a max of two */
3698 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3699 if (ntohl(r->request_seq) == seq) {
3700 return (r);
3701 }
3702 }
3703 /* that seq is not here */
3704 return (NULL);
3705 }
3706
3707 static void
3708 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3709 {
3710 struct sctp_association *asoc;
3711 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3712
3713 if (stcb->asoc.str_reset == NULL) {
3714 return;
3715 }
3716 asoc = &stcb->asoc;
3717
3718 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT+SCTP_LOC_26);
3719 TAILQ_REMOVE(&asoc->control_send_queue,
3720 chk,
3721 sctp_next);
3722 if (chk->data) {
3723 sctp_m_freem(chk->data);
3724 chk->data = NULL;
3725 }
3726 asoc->ctrl_queue_cnt--;
3727 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3728 /*sa_ignore NO_NULL_CHK*/
3729 stcb->asoc.str_reset = NULL;
3730 }
3731
3732
3733 static int
3734 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3735 uint32_t seq, uint32_t action,
3736 struct sctp_stream_reset_response *respin)
3737 {
3738 uint16_t type;
3739 int lparm_len;
3740 struct sctp_association *asoc = &stcb->asoc;
3741 struct sctp_tmit_chunk *chk;
3742 struct sctp_stream_reset_out_request *srparam;
3743 uint32_t number_entries;
3744
3745 if (asoc->stream_reset_outstanding == 0) {
3746 /* duplicate */
3747 return (0);
3748 }
3749 if (seq == stcb->asoc.str_reset_seq_out) {
3750 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3751 if (srparam) {
3752 stcb->asoc.str_reset_seq_out++;
3753 type = ntohs(srparam->ph.param_type);
3754 lparm_len = ntohs(srparam->ph.param_length);
3755 if (type == SCTP_STR_RESET_OUT_REQUEST) {
3756 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3757 asoc->stream_reset_out_is_outstanding = 0;
3758 if (asoc->stream_reset_outstanding)
3759 asoc->stream_reset_outstanding--;
3760 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3761 /* do it */
3762 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3763 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3764 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3765 } else {
3766 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3767 }
3768 } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3769 /* Answered my request */
3770 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3771 if (asoc->stream_reset_outstanding)
3772 asoc->stream_reset_outstanding--;
3773 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3774 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3775 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3776 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3777 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3778 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3779 }
3780 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3781 /* Ok we now may have more streams */
3782 int num_stream;
3783
3784 num_stream = stcb->asoc.strm_pending_add_size;
3785 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3786 /* TSNH */
3787 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3788 }
3789 stcb->asoc.strm_pending_add_size = 0;
3790 if (asoc->stream_reset_outstanding)
3791 asoc->stream_reset_outstanding--;
3792 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3793 /* Put the new streams into effect */
3794 stcb->asoc.streamoutcnt += num_stream;
3795 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3796 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3797 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3798 SCTP_STREAM_CHANGE_DENIED);
3799 } else {
3800 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3801 SCTP_STREAM_CHANGE_FAILED);
3802 }
3803 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3804 if (asoc->stream_reset_outstanding)
3805 asoc->stream_reset_outstanding--;
3806 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3807 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3808 SCTP_STREAM_CHANGE_DENIED);
3809 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3810 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3811 SCTP_STREAM_CHANGE_FAILED);
3812 }
3813 } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3814 /**
3815 * a) Adopt the new in tsn.
3816 * b) reset the map
3817 * c) Adopt the new out-tsn
3818 */
3819 struct sctp_stream_reset_response_tsn *resp;
3820 struct sctp_forward_tsn_chunk fwdtsn;
3821 int abort_flag = 0;
3822 if (respin == NULL) {
3823 /* huh ? */
3824 return (0);
3825 }
3826 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3827 resp = (struct sctp_stream_reset_response_tsn *)respin;
3828 asoc->stream_reset_outstanding--;
3829 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3830 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3831 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3832 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3833 if (abort_flag) {
3834 return (1);
3835 }
3836 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3837 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3838 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3839 }
3840
3841 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3842 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3843 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3844
3845 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3846 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3847
3848 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3849 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3850
3851 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3852 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3853 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3854 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3855 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3856 SCTP_ASSOC_RESET_DENIED);
3857 } else {
3858 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3859 SCTP_ASSOC_RESET_FAILED);
3860 }
3861 }
3862 /* get rid of the request and get the request flags */
3863 if (asoc->stream_reset_outstanding == 0) {
3864 sctp_clean_up_stream_reset(stcb);
3865 }
3866 }
3867 }
3868 return (0);
3869 }
3870
3871 static void
3872 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3873 struct sctp_tmit_chunk *chk,
3874 struct sctp_stream_reset_in_request *req, int trunc)
3875 {
3876 uint32_t seq;
3877 int len, i;
3878 int number_entries;
3879 uint16_t temp;
3880
3881 /*
3882 * peer wants me to send a str-reset to him for my outgoing seq's if
3883 * seq_in is right.
3884 */
3885 struct sctp_association *asoc = &stcb->asoc;
3886
3887 seq = ntohl(req->request_seq);
3888 if (asoc->str_reset_seq_in == seq) {
3889 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3890 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3891 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3892 } else if (trunc) {
3893 /* Can't do it, since they exceeded our buffer size */
3894 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3895 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3896 len = ntohs(req->ph.param_length);
3897 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3898 for (i = 0; i < number_entries; i++) {
3899 temp = ntohs(req->list_of_streams[i]);
3900 req->list_of_streams[i] = temp;
3901 }
3902 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3903 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3904 asoc->str_reset_seq_out,
3905 seq, (asoc->sending_seq - 1));
3906 asoc->stream_reset_out_is_outstanding = 1;
3907 asoc->str_reset = chk;
3908 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3909 stcb->asoc.stream_reset_outstanding++;
3910 } else {
3911 /* Can't do it, since we have sent one out */
3912 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3913 }
3914 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3915 asoc->str_reset_seq_in++;
3916 } else if (asoc->str_reset_seq_in - 1 == seq) {
3917 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3918 } else if (asoc->str_reset_seq_in - 2 == seq) {
3919 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3920 } else {
3921 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3922 }
3923 }
3924
3925 static int
3926 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3927 struct sctp_tmit_chunk *chk,
3928 struct sctp_stream_reset_tsn_request *req)
3929 {
3930 /* reset all in and out and update the tsn */
3931 /*
3932 * A) reset my str-seq's on in and out. B) Select a receive next,
3933 * and set cum-ack to it. Also process this selected number as a
3934 * fwd-tsn as well. C) set in the response my next sending seq.
3935 */
3936 struct sctp_forward_tsn_chunk fwdtsn;
3937 struct sctp_association *asoc = &stcb->asoc;
3938 int abort_flag = 0;
3939 uint32_t seq;
3940
3941 seq = ntohl(req->request_seq);
3942 if (asoc->str_reset_seq_in == seq) {
3943 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3944 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3945 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3946 } else {
3947 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3948 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3949 fwdtsn.ch.chunk_flags = 0;
3950 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3951 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3952 if (abort_flag) {
3953 return (1);
3954 }
3955 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3956 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3957 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3958 }
3959 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3960 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3961 memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3962 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3963 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3964 atomic_add_int(&asoc->sending_seq, 1);
3965 /* save off historical data for retrans */
3966 asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3967 asoc->last_sending_seq[0] = asoc->sending_seq;
3968 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3969 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3970 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3971 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3972 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3973 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3974 }
3975 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3976 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3977 asoc->str_reset_seq_in++;
3978 } else if (asoc->str_reset_seq_in - 1 == seq) {
3979 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3980 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3981 } else if (asoc->str_reset_seq_in - 2 == seq) {
3982 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3983 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3984 } else {
3985 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3986 }
3987 return (0);
3988 }
3989
3990 static void
3991 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3992 struct sctp_tmit_chunk *chk,
3993 struct sctp_stream_reset_out_request *req, int trunc)
3994 {
3995 uint32_t seq, tsn;
3996 int number_entries, len;
3997 struct sctp_association *asoc = &stcb->asoc;
3998
3999 seq = ntohl(req->request_seq);
4000
4001 /* now if its not a duplicate we process it */
4002 if (asoc->str_reset_seq_in == seq) {
4003 len = ntohs(req->ph.param_length);
4004 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
4005 /*
4006 * the sender is resetting, handle the list issue.. we must
4007 * a) verify if we can do the reset, if so no problem b) If
4008 * we can't do the reset we must copy the request. c) queue
4009 * it, and setup the data in processor to trigger it off
4010 * when needed and dequeue all the queued data.
4011 */
4012 tsn = ntohl(req->send_reset_at_tsn);
4013
4014 /* move the reset action back one */
4015 asoc->last_reset_action[1] = asoc->last_reset_action[0];
4016 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
4017 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4018 } else if (trunc) {
4019 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4020 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
4021 /* we can do it now */
4022 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
4023 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4024 } else {
4025 /*
4026 * we must queue it up and thus wait for the TSN's
4027 * to arrive that are at or before tsn
4028 */
4029 struct sctp_stream_reset_list *liste;
4030 int siz;
4031
4032 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
4033 SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
4034 siz, SCTP_M_STRESET);
4035 if (liste == NULL) {
4036 /* gak out of memory */
4037 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4038 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4039 return;
4040 }
4041 liste->tsn = tsn;
4042 liste->number_entries = number_entries;
4043 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
4044 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
4045 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4046 }
4047 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4048 asoc->str_reset_seq_in++;
4049 } else if ((asoc->str_reset_seq_in - 1) == seq) {
4050 /*
4051 * one seq back, just echo back last action since my
4052 * response was lost.
4053 */
4054 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4055 } else if ((asoc->str_reset_seq_in - 2) == seq) {
4056 /*
4057 * two seq back, just echo back last action since my
4058 * response was lost.
4059 */
4060 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4061 } else {
4062 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4063 }
4064 }
4065
4066 static void
4067 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4068 struct sctp_stream_reset_add_strm *str_add)
4069 {
4070 /*
4071 * Peer is requesting to add more streams.
4072 * If its within our max-streams we will
4073 * allow it.
4074 */
4075 uint32_t num_stream, i;
4076 uint32_t seq;
4077 struct sctp_association *asoc = &stcb->asoc;
4078 struct sctp_queued_to_read *ctl, *nctl;
4079
4080 /* Get the number. */
4081 seq = ntohl(str_add->request_seq);
4082 num_stream = ntohs(str_add->number_of_streams);
4083 /* Now what would be the new total? */
4084 if (asoc->str_reset_seq_in == seq) {
4085 num_stream += stcb->asoc.streamincnt;
4086 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4087 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4088 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4089 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4090 (num_stream > 0xffff)) {
4091 /* We must reject it they ask for to many */
4092 denied:
4093 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4094 } else {
4095 /* Ok, we can do that :-) */
4096 struct sctp_stream_in *oldstrm;
4097
4098 /* save off the old */
4099 oldstrm = stcb->asoc.strmin;
4100 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4101 (num_stream * sizeof(struct sctp_stream_in)),
4102 SCTP_M_STRMI);
4103 if (stcb->asoc.strmin == NULL) {
4104 stcb->asoc.strmin = oldstrm;
4105 goto denied;
4106 }
4107 /* copy off the old data */
4108 for (i = 0; i < stcb->asoc.streamincnt; i++) {
4109 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4110 stcb->asoc.strmin[i].stream_no = i;
4111 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
4112 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4113 /* now anything on those queues? */
4114 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
4115 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
4116 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
4117 }
4118 }
4119 /* Init the new streams */
4120 for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4121 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4122 stcb->asoc.strmin[i].stream_no = i;
4123 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
4124 stcb->asoc.strmin[i].delivery_started = 0;
4125 }
4126 SCTP_FREE(oldstrm, SCTP_M_STRMI);
4127 /* update the size */
4128 stcb->asoc.streamincnt = num_stream;
4129 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4130 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4131 }
4132 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4133 asoc->str_reset_seq_in++;
4134 } else if ((asoc->str_reset_seq_in - 1) == seq) {
4135 /*
4136 * one seq back, just echo back last action since my
4137 * response was lost.
4138 */
4139 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4140 } else if ((asoc->str_reset_seq_in - 2) == seq) {
4141 /*
4142 * two seq back, just echo back last action since my
4143 * response was lost.
4144 */
4145 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4146 } else {
4147 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4148
4149 }
4150 }
4151
4152 static void
4153 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4154 struct sctp_stream_reset_add_strm *str_add)
4155 {
4156 /*
4157 * Peer is requesting to add more streams.
4158 * If its within our max-streams we will
4159 * allow it.
4160 */
4161 uint16_t num_stream;
4162 uint32_t seq;
4163 struct sctp_association *asoc = &stcb->asoc;
4164
4165 /* Get the number. */
4166 seq = ntohl(str_add->request_seq);
4167 num_stream = ntohs(str_add->number_of_streams);
4168 /* Now what would be the new total? */
4169 if (asoc->str_reset_seq_in == seq) {
4170 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4171 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4172 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4173 } else if (stcb->asoc.stream_reset_outstanding) {
4174 /* We must reject it we have something pending */
4175 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4176 } else {
4177 /* Ok, we can do that :-) */
4178 int mychk;
4179 mychk = stcb->asoc.streamoutcnt;
4180 mychk += num_stream;
4181 if (mychk < 0x10000) {
4182 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4183 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4184 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4185 }
4186 } else {
4187 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4188 }
4189 }
4190 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4191 asoc->str_reset_seq_in++;
4192 } else if ((asoc->str_reset_seq_in - 1) == seq) {
4193 /*
4194 * one seq back, just echo back last action since my
4195 * response was lost.
4196 */
4197 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4198 } else if ((asoc->str_reset_seq_in - 2) == seq) {
4199 /*
4200 * two seq back, just echo back last action since my
4201 * response was lost.
4202 */
4203 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4204 } else {
4205 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4206 }
4207 }
4208
4209 #if !defined(__Panda__)
4210 #ifdef __GNUC__
4211 __attribute__ ((noinline))
4212 #endif
4213 #endif
4214 static int
4215 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4216 struct sctp_chunkhdr *ch_req)
4217 {
4218 int chk_length, param_len, ptype;
4219 struct sctp_paramhdr pstore;
4220 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4221 uint32_t seq = 0;
4222 int num_req = 0;
4223 int trunc = 0;
4224 struct sctp_tmit_chunk *chk;
4225 struct sctp_chunkhdr *ch;
4226 struct sctp_paramhdr *ph;
4227 int ret_code = 0;
4228 int num_param = 0;
4229
4230 /* now it may be a reset or a reset-response */
4231 chk_length = ntohs(ch_req->chunk_length);
4232
4233 /* setup for adding the response */
4234 sctp_alloc_a_chunk(stcb, chk);
4235 if (chk == NULL) {
4236 return (ret_code);
4237 }
4238 chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4239 chk->rec.chunk_id.can_take_data = 0;
4240 chk->asoc = &stcb->asoc;
4241 chk->no_fr_allowed = 0;
4242 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4243 chk->book_size_scale = 0;
4244 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4245 if (chk->data == NULL) {
4246 strres_nochunk:
4247 if (chk->data) {
4248 sctp_m_freem(chk->data);
4249 chk->data = NULL;
4250 }
4251 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4252 return (ret_code);
4253 }
4254 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4255
4256 /* setup chunk parameters */
4257 chk->sent = SCTP_DATAGRAM_UNSENT;
4258 chk->snd_count = 0;
4259 chk->whoTo = NULL;
4260
4261 ch = mtod(chk->data, struct sctp_chunkhdr *);
4262 ch->chunk_type = SCTP_STREAM_RESET;
4263 ch->chunk_flags = 0;
4264 ch->chunk_length = htons(chk->send_size);
4265 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4266 offset += sizeof(struct sctp_chunkhdr);
4267 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
4268 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4269 if (ph == NULL)
4270 break;
4271 param_len = ntohs(ph->param_length);
4272 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
4273 /* bad param */
4274 break;
4275 }
4276 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
4277 (uint8_t *)&cstore);
4278 ptype = ntohs(ph->param_type);
4279 num_param++;
4280 if (param_len > (int)sizeof(cstore)) {
4281 trunc = 1;
4282 } else {
4283 trunc = 0;
4284 }
4285 if (num_param > SCTP_MAX_RESET_PARAMS) {
4286 /* hit the max of parameters already sorry.. */
4287 break;
4288 }
4289 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4290 struct sctp_stream_reset_out_request *req_out;
4291 req_out = (struct sctp_stream_reset_out_request *)ph;
4292 num_req++;
4293 if (stcb->asoc.stream_reset_outstanding) {
4294 seq = ntohl(req_out->response_seq);
4295 if (seq == stcb->asoc.str_reset_seq_out) {
4296 /* implicit ack */
4297 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4298 }
4299 }
4300 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4301 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4302 struct sctp_stream_reset_add_strm *str_add;
4303 str_add = (struct sctp_stream_reset_add_strm *)ph;
4304 num_req++;
4305 sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4306 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4307 struct sctp_stream_reset_add_strm *str_add;
4308 str_add = (struct sctp_stream_reset_add_strm *)ph;
4309 num_req++;
4310 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4311 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4312 struct sctp_stream_reset_in_request *req_in;
4313 num_req++;
4314 req_in = (struct sctp_stream_reset_in_request *)ph;
4315 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4316 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4317 struct sctp_stream_reset_tsn_request *req_tsn;
4318 num_req++;
4319 req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4320 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4321 ret_code = 1;
4322 goto strres_nochunk;
4323 }
4324 /* no more */
4325 break;
4326 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4327 struct sctp_stream_reset_response *resp;
4328 uint32_t result;
4329 resp = (struct sctp_stream_reset_response *)ph;
4330 seq = ntohl(resp->response_seq);
4331 result = ntohl(resp->result);
4332 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4333 ret_code = 1;
4334 goto strres_nochunk;
4335 }
4336 } else {
4337 break;
4338 }
4339 offset += SCTP_SIZE32(param_len);
4340 chk_length -= SCTP_SIZE32(param_len);
4341 }
4342 if (num_req == 0) {
4343 /* we have no response free the stuff */
4344 goto strres_nochunk;
4345 }
4346 /* ok we have a chunk to link in */
4347 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4348 chk,
4349 sctp_next);
4350 stcb->asoc.ctrl_queue_cnt++;
4351 return (ret_code);
4352 }
4353
4354 /*
4355 * Handle a router or endpoints report of a packet loss, there are two ways
4356 * to handle this, either we get the whole packet and must disect it
4357 * ourselves (possibly with truncation and or corruption) or it is a summary
4358 * from a middle box that did the disectting for us.
4359 */
4360 static void
4361 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4362 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4363 {
4364 uint32_t bottle_bw, on_queue;
4365 uint16_t trunc_len;
4366 unsigned int chlen;
4367 unsigned int at;
4368 struct sctp_chunk_desc desc;
4369 struct sctp_chunkhdr *ch;
4370
4371 chlen = ntohs(cp->ch.chunk_length);
4372 chlen -= sizeof(struct sctp_pktdrop_chunk);
4373 /* XXX possible chlen underflow */
4374 if (chlen == 0) {
4375 ch = NULL;
4376 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4377 SCTP_STAT_INCR(sctps_pdrpbwrpt);
4378 } else {
4379 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4380 chlen -= sizeof(struct sctphdr);
4381 /* XXX possible chlen underflow */
4382 memset(&desc, 0, sizeof(desc));
4383 }
4384 trunc_len = (uint16_t) ntohs(cp->trunc_len);
4385 if (trunc_len > limit) {
4386 trunc_len = limit;
4387 }
4388
4389 /* now the chunks themselves */
4390 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4391 desc.chunk_type = ch->chunk_type;
4392 /* get amount we need to move */
4393 at = ntohs(ch->chunk_length);
4394 if (at < sizeof(struct sctp_chunkhdr)) {
4395 /* corrupt chunk, maybe at the end? */
4396 SCTP_STAT_INCR(sctps_pdrpcrupt);
4397 break;
4398 }
4399 if (trunc_len == 0) {
4400 /* we are supposed to have all of it */
4401 if (at > chlen) {
4402 /* corrupt skip it */
4403 SCTP_STAT_INCR(sctps_pdrpcrupt);
4404 break;
4405 }
4406 } else {
4407 /* is there enough of it left ? */
4408 if (desc.chunk_type == SCTP_DATA) {
4409 if (chlen < (sizeof(struct sctp_data_chunk) +
4410 sizeof(desc.data_bytes))) {
4411 break;
4412 }
4413 } else {
4414 if (chlen < sizeof(struct sctp_chunkhdr)) {
4415 break;
4416 }
4417 }
4418 }
4419 if (desc.chunk_type == SCTP_DATA) {
4420 /* can we get out the tsn? */
4421 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4422 SCTP_STAT_INCR(sctps_pdrpmbda);
4423
4424 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4425 /* yep */
4426 struct sctp_data_chunk *dcp;
4427 uint8_t *ddp;
4428 unsigned int iii;
4429
4430 dcp = (struct sctp_data_chunk *)ch;
4431 ddp = (uint8_t *) (dcp + 1);
4432 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4433 desc.data_bytes[iii] = ddp[iii];
4434 }
4435 desc.tsn_ifany = dcp->dp.tsn;
4436 } else {
4437 /* nope we are done. */
4438 SCTP_STAT_INCR(sctps_pdrpnedat);
4439 break;
4440 }
4441 } else {
4442 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4443 SCTP_STAT_INCR(sctps_pdrpmbct);
4444 }
4445
4446 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4447 SCTP_STAT_INCR(sctps_pdrppdbrk);
4448 break;
4449 }
4450 if (SCTP_SIZE32(at) > chlen) {
4451 break;
4452 }
4453 chlen -= SCTP_SIZE32(at);
4454 if (chlen < sizeof(struct sctp_chunkhdr)) {
4455 /* done, none left */
4456 break;
4457 }
4458 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4459 }
4460 /* Now update any rwnd --- possibly */
4461 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4462 /* From a peer, we get a rwnd report */
4463 uint32_t a_rwnd;
4464
4465 SCTP_STAT_INCR(sctps_pdrpfehos);
4466
4467 bottle_bw = ntohl(cp->bottle_bw);
4468 on_queue = ntohl(cp->current_onq);
4469 if (bottle_bw && on_queue) {
4470 /* a rwnd report is in here */
4471 if (bottle_bw > on_queue)
4472 a_rwnd = bottle_bw - on_queue;
4473 else
4474 a_rwnd = 0;
4475
4476 if (a_rwnd == 0)
4477 stcb->asoc.peers_rwnd = 0;
4478 else {
4479 if (a_rwnd > stcb->asoc.total_flight) {
4480 stcb->asoc.peers_rwnd =
4481 a_rwnd - stcb->asoc.total_flight;
4482 } else {
4483 stcb->asoc.peers_rwnd = 0;
4484 }
4485 if (stcb->asoc.peers_rwnd <
4486 stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4487 /* SWS sender side engages */
4488 stcb->asoc.peers_rwnd = 0;
4489 }
4490 }
4491 }
4492 } else {
4493 SCTP_STAT_INCR(sctps_pdrpfmbox);
4494 }
4495
4496 /* now middle boxes in sat networks get a cwnd bump */
4497 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4498 (stcb->asoc.sat_t3_loss_recovery == 0) &&
4499 (stcb->asoc.sat_network)) {
4500 /*
4501 * This is debateable but for sat networks it makes sense
4502 * Note if a T3 timer has went off, we will prohibit any
4503 * changes to cwnd until we exit the t3 loss recovery.
4504 */
4505 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4506 net, cp, &bottle_bw, &on_queue);
4507 }
4508 }
4509
4510 /*
4511 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4512 * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4513 * offset: offset into the mbuf chain to first chunkhdr - length: is the
4514 * length of the complete packet outputs: - length: modified to remaining
4515 * length after control processing - netp: modified to new sctp_nets after
4516 * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4517 * bad packet,...) otherwise return the tcb for this packet
4518 */
4519 #if !defined(__Panda__)
4520 #ifdef __GNUC__
4521 __attribute__ ((noinline))
4522 #endif
4523 #endif
4524 static struct sctp_tcb *
4525 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4526 struct sockaddr *src, struct sockaddr *dst,
4527 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4528 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4529 #if defined(__FreeBSD__)
4530 uint8_t use_mflowid, uint32_t mflowid,
4531 #endif
4532 uint32_t vrf_id, uint16_t port)
4533 {
4534 struct sctp_association *asoc;
4535 uint32_t vtag_in;
4536 int num_chunks = 0; /* number of control chunks processed */
4537 uint32_t chk_length;
4538 int ret;
4539 int abort_no_unlock = 0;
4540 int ecne_seen = 0;
4541 /*
4542 * How big should this be, and should it be alloc'd? Lets try the
4543 * d-mtu-ceiling for now (2k) and that should hopefully work ...
4544 * until we get into jumbo grams and such..
4545 */
4546 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4547 struct sctp_tcb *locked_tcb = stcb;
4548 int got_auth = 0;
4549 uint32_t auth_offset = 0, auth_len = 0;
4550 int auth_skipped = 0;
4551 int asconf_cnt = 0;
4552 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4553 struct socket *so;
4554 #endif
4555
4556 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4557 iphlen, *offset, length, (void *)stcb);
4558
4559 /* validate chunk header length... */
4560 if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4561 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4562 ntohs(ch->chunk_length));
4563 if (locked_tcb) {
4564 SCTP_TCB_UNLOCK(locked_tcb);
4565 }
4566 return (NULL);
4567 }
4568 /*
4569 * validate the verification tag
4570 */
4571 vtag_in = ntohl(sh->v_tag);
4572
4573 if (locked_tcb) {
4574 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4575 }
4576 if (ch->chunk_type == SCTP_INITIATION) {
4577 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4578 ntohs(ch->chunk_length), vtag_in);
4579 if (vtag_in != 0) {
4580 /* protocol error- silently discard... */
4581 SCTP_STAT_INCR(sctps_badvtag);
4582 if (locked_tcb) {
4583 SCTP_TCB_UNLOCK(locked_tcb);
4584 }
4585 return (NULL);
4586 }
4587 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4588 /*
4589 * If there is no stcb, skip the AUTH chunk and process
4590 * later after a stcb is found (to validate the lookup was
4591 * valid.
4592 */
4593 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4594 (stcb == NULL) &&
4595 !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4596 /* save this chunk for later processing */
4597 auth_skipped = 1;
4598 auth_offset = *offset;
4599 auth_len = ntohs(ch->chunk_length);
4600
4601 /* (temporarily) move past this chunk */
4602 *offset += SCTP_SIZE32(auth_len);
4603 if (*offset >= length) {
4604 /* no more data left in the mbuf chain */
4605 *offset = length;
4606 if (locked_tcb) {
4607 SCTP_TCB_UNLOCK(locked_tcb);
4608 }
4609 return (NULL);
4610 }
4611 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4612 sizeof(struct sctp_chunkhdr), chunk_buf);
4613 }
4614 if (ch == NULL) {
4615 /* Help */
4616 *offset = length;
4617 if (locked_tcb) {
4618 SCTP_TCB_UNLOCK(locked_tcb);
4619 }
4620 return (NULL);
4621 }
4622 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4623 goto process_control_chunks;
4624 }
4625 /*
4626 * first check if it's an ASCONF with an unknown src addr we
4627 * need to look inside to find the association
4628 */
4629 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4630 struct sctp_chunkhdr *asconf_ch = ch;
4631 uint32_t asconf_offset = 0, asconf_len = 0;
4632
4633 /* inp's refcount may be reduced */
4634 SCTP_INP_INCR_REF(inp);
4635
4636 asconf_offset = *offset;
4637 do {
4638 asconf_len = ntohs(asconf_ch->chunk_length);
4639 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4640 break;
4641 stcb = sctp_findassociation_ep_asconf(m,
4642 *offset,
4643 dst,
4644 sh, &inp, netp, vrf_id);
4645 if (stcb != NULL)
4646 break;
4647 asconf_offset += SCTP_SIZE32(asconf_len);
4648 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4649 sizeof(struct sctp_chunkhdr), chunk_buf);
4650 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4651 if (stcb == NULL) {
4652 /*
4653 * reduce inp's refcount if not reduced in
4654 * sctp_findassociation_ep_asconf().
4655 */
4656 SCTP_INP_DECR_REF(inp);
4657 } else {
4658 locked_tcb = stcb;
4659 }
4660
4661 /* now go back and verify any auth chunk to be sure */
4662 if (auth_skipped && (stcb != NULL)) {
4663 struct sctp_auth_chunk *auth;
4664
4665 auth = (struct sctp_auth_chunk *)
4666 sctp_m_getptr(m, auth_offset,
4667 auth_len, chunk_buf);
4668 got_auth = 1;
4669 auth_skipped = 0;
4670 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4671 auth_offset)) {
4672 /* auth HMAC failed so dump it */
4673 *offset = length;
4674 if (locked_tcb) {
4675 SCTP_TCB_UNLOCK(locked_tcb);
4676 }
4677 return (NULL);
4678 } else {
4679 /* remaining chunks are HMAC checked */
4680 stcb->asoc.authenticated = 1;
4681 }
4682 }
4683 }
4684 if (stcb == NULL) {
4685 /* no association, so it's out of the blue... */
4686 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp,
4687 #if defined(__FreeBSD__)
4688 use_mflowid, mflowid,
4689 #endif
4690 vrf_id, port);
4691 *offset = length;
4692 if (locked_tcb) {
4693 SCTP_TCB_UNLOCK(locked_tcb);
4694 }
4695 return (NULL);
4696 }
4697 asoc = &stcb->asoc;
4698 /* ABORT and SHUTDOWN can use either v_tag... */
4699 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4700 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4701 (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4702 /* Take the T-bit always into account. */
4703 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4704 (vtag_in == asoc->my_vtag)) ||
4705 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4706 (vtag_in == asoc->peer_vtag))) {
4707 /* this is valid */
4708 } else {
4709 /* drop this packet... */
4710 SCTP_STAT_INCR(sctps_badvtag);
4711 if (locked_tcb) {
4712 SCTP_TCB_UNLOCK(locked_tcb);
4713 }
4714 return (NULL);
4715 }
4716 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4717 if (vtag_in != asoc->my_vtag) {
4718 /*
4719 * this could be a stale SHUTDOWN-ACK or the
4720 * peer never got the SHUTDOWN-COMPLETE and
4721 * is still hung; we have started a new asoc
4722 * but it won't complete until the shutdown
4723 * is completed
4724 */
4725 if (locked_tcb) {
4726 SCTP_TCB_UNLOCK(locked_tcb);
4727 }
4728 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4729 sh, inp,
4730 #if defined(__FreeBSD__)
4731 use_mflowid, mflowid,
4732 #endif
4733 vrf_id, port);
4734 return (NULL);
4735 }
4736 } else {
4737 /* for all other chunks, vtag must match */
4738 if (vtag_in != asoc->my_vtag) {
4739 /* invalid vtag... */
4740 SCTPDBG(SCTP_DEBUG_INPUT3,
4741 "invalid vtag: %xh, expect %xh\n",
4742 vtag_in, asoc->my_vtag);
4743 SCTP_STAT_INCR(sctps_badvtag);
4744 if (locked_tcb) {
4745 SCTP_TCB_UNLOCK(locked_tcb);
4746 }
4747 *offset = length;
4748 return (NULL);
4749 }
4750 }
4751 } /* end if !SCTP_COOKIE_ECHO */
4752 /*
4753 * process all control chunks...
4754 */
4755 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4756 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4757 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4758 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4759 /* implied cookie-ack.. we must have lost the ack */
4760 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4761 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4762 stcb->asoc.overall_error_count,
4763 0,
4764 SCTP_FROM_SCTP_INPUT,
4765 __LINE__);
4766 }
4767 stcb->asoc.overall_error_count = 0;
4768 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4769 *netp);
4770 }
4771
4772 process_control_chunks:
4773 while (IS_SCTP_CONTROL(ch)) {
4774 /* validate chunk length */
4775 chk_length = ntohs(ch->chunk_length);
4776 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4777 ch->chunk_type, chk_length);
4778 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4779 if (chk_length < sizeof(*ch) ||
4780 (*offset + (int)chk_length) > length) {
4781 *offset = length;
4782 if (locked_tcb) {
4783 SCTP_TCB_UNLOCK(locked_tcb);
4784 }
4785 return (NULL);
4786 }
4787 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4788 /*
4789 * INIT-ACK only gets the init ack "header" portion only
4790 * because we don't have to process the peer's COOKIE. All
4791 * others get a complete chunk.
4792 */
4793 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4794 (ch->chunk_type == SCTP_INITIATION)) {
4795 /* get an init-ack chunk */
4796 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4797 sizeof(struct sctp_init_ack_chunk), chunk_buf);
4798 if (ch == NULL) {
4799 *offset = length;
4800 if (locked_tcb) {
4801 SCTP_TCB_UNLOCK(locked_tcb);
4802 }
4803 return (NULL);
4804 }
4805 } else {
4806 /* For cookies and all other chunks. */
4807 if (chk_length > sizeof(chunk_buf)) {
4808 /*
4809 * use just the size of the chunk buffer
4810 * so the front part of our chunks fit in
4811 * contiguous space up to the chunk buffer
4812 * size (508 bytes).
4813 * For chunks that need to get more than that
4814 * they must use the sctp_m_getptr() function
4815 * or other means (e.g. know how to parse mbuf
4816 * chains). Cookies do this already.
4817 */
4818 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4819 (sizeof(chunk_buf) - 4),
4820 chunk_buf);
4821 if (ch == NULL) {
4822 *offset = length;
4823 if (locked_tcb) {
4824 SCTP_TCB_UNLOCK(locked_tcb);
4825 }
4826 return (NULL);
4827 }
4828 } else {
4829 /* We can fit it all */
4830 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4831 chk_length, chunk_buf);
4832 if (ch == NULL) {
4833 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4834 *offset = length;
4835 if (locked_tcb) {
4836 SCTP_TCB_UNLOCK(locked_tcb);
4837 }
4838 return (NULL);
4839 }
4840 }
4841 }
4842 num_chunks++;
4843 /* Save off the last place we got a control from */
4844 if (stcb != NULL) {
4845 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4846 /*
4847 * allow last_control to be NULL if
4848 * ASCONF... ASCONF processing will find the
4849 * right net later
4850 */
4851 if ((netp != NULL) && (*netp != NULL))
4852 stcb->asoc.last_control_chunk_from = *netp;
4853 }
4854 }
4855 #ifdef SCTP_AUDITING_ENABLED
4856 sctp_audit_log(0xB0, ch->chunk_type);
4857 #endif
4858
4859 /* check to see if this chunk required auth, but isn't */
4860 if ((stcb != NULL) &&
4861 !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4862 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4863 !stcb->asoc.authenticated) {
4864 /* "silently" ignore */
4865 SCTP_STAT_INCR(sctps_recvauthmissing);
4866 goto next_chunk;
4867 }
4868 switch (ch->chunk_type) {
4869 case SCTP_INITIATION:
4870 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4871 /* The INIT chunk must be the only chunk. */
4872 if ((num_chunks > 1) ||
4873 (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4874 sctp_abort_association(inp, stcb, m, iphlen,
4875 src, dst, sh, NULL,
4876 #if defined(__FreeBSD__)
4877 use_mflowid, mflowid,
4878 #endif
4879 vrf_id, port);
4880 *offset = length;
4881 return (NULL);
4882 }
4883 /* Honor our resource limit. */
4884 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4885 struct mbuf *op_err;
4886
4887 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
4888 sctp_abort_association(inp, stcb, m, iphlen,
4889 src, dst, sh, op_err,
4890 #if defined(__FreeBSD__)
4891 use_mflowid, mflowid,
4892 #endif
4893 vrf_id, port);
4894 *offset = length;
4895 return (NULL);
4896 }
4897 sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4898 (struct sctp_init_chunk *)ch, inp,
4899 stcb, &abort_no_unlock,
4900 #if defined(__FreeBSD__)
4901 use_mflowid, mflowid,
4902 #endif
4903 vrf_id, port);
4904 *offset = length;
4905 if ((!abort_no_unlock) && (locked_tcb)) {
4906 SCTP_TCB_UNLOCK(locked_tcb);
4907 }
4908 return (NULL);
4909 break;
4910 case SCTP_PAD_CHUNK:
4911 break;
4912 case SCTP_INITIATION_ACK:
4913 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4914 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4915 /* We are not interested anymore */
4916 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4917 ;
4918 } else {
4919 if (locked_tcb != stcb) {
4920 /* Very unlikely */
4921 SCTP_TCB_UNLOCK(locked_tcb);
4922 }
4923 *offset = length;
4924 if (stcb) {
4925 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4926 so = SCTP_INP_SO(inp);
4927 atomic_add_int(&stcb->asoc.refcnt, 1);
4928 SCTP_TCB_UNLOCK(stcb);
4929 SCTP_SOCKET_LOCK(so, 1);
4930 SCTP_TCB_LOCK(stcb);
4931 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4932 #endif
4933 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_27);
4934 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4935 SCTP_SOCKET_UNLOCK(so, 1);
4936 #endif
4937 }
4938 return (NULL);
4939 }
4940 }
4941 /* The INIT-ACK chunk must be the only chunk. */
4942 if ((num_chunks > 1) ||
4943 (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4944 *offset = length;
4945 if (locked_tcb) {
4946 SCTP_TCB_UNLOCK(locked_tcb);
4947 }
4948 return (NULL);
4949 }
4950 if ((netp) && (*netp)) {
4951 ret = sctp_handle_init_ack(m, iphlen, *offset,
4952 src, dst, sh,
4953 (struct sctp_init_ack_chunk *)ch,
4954 stcb, *netp,
4955 &abort_no_unlock,
4956 #if defined(__FreeBSD__)
4957 use_mflowid, mflowid,
4958 #endif
4959 vrf_id);
4960 } else {
4961 ret = -1;
4962 }
4963 *offset = length;
4964 if (abort_no_unlock) {
4965 return (NULL);
4966 }
4967 /*
4968 * Special case, I must call the output routine to
4969 * get the cookie echoed
4970 */
4971 if ((stcb != NULL) && (ret == 0)) {
4972 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4973 }
4974 if (locked_tcb) {
4975 SCTP_TCB_UNLOCK(locked_tcb);
4976 }
4977 return (NULL);
4978 break;
4979 case SCTP_SELECTIVE_ACK:
4980 {
4981 struct sctp_sack_chunk *sack;
4982 int abort_now = 0;
4983 uint32_t a_rwnd, cum_ack;
4984 uint16_t num_seg, num_dup;
4985 uint8_t flags;
4986 int offset_seg, offset_dup;
4987
4988 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4989 SCTP_STAT_INCR(sctps_recvsacks);
4990 if (stcb == NULL) {
4991 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4992 break;
4993 }
4994 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4995 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4996 break;
4997 }
4998 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4999 /*-
5000 * If we have sent a shutdown-ack, we will pay no
5001 * attention to a sack sent in to us since
5002 * we don't care anymore.
5003 */
5004 break;
5005 }
5006 sack = (struct sctp_sack_chunk *)ch;
5007 flags = ch->chunk_flags;
5008 cum_ack = ntohl(sack->sack.cum_tsn_ack);
5009 num_seg = ntohs(sack->sack.num_gap_ack_blks);
5010 num_dup = ntohs(sack->sack.num_dup_tsns);
5011 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
5012 if (sizeof(struct sctp_sack_chunk) +
5013 num_seg * sizeof(struct sctp_gap_ack_block) +
5014 num_dup * sizeof(uint32_t) != chk_length) {
5015 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
5016 break;
5017 }
5018 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
5019 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5020 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5021 cum_ack, num_seg, a_rwnd);
5022 stcb->asoc.seen_a_sack_this_pkt = 1;
5023 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5024 (num_seg == 0) &&
5025 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5026 (stcb->asoc.saw_sack_with_frags == 0) &&
5027 (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5028 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
5029 ) {
5030 /* We have a SIMPLE sack having no prior segments and
5031 * data on sent queue to be acked.. Use the faster
5032 * path sack processing. We also allow window update
5033 * sacks with no missing segments to go this way too.
5034 */
5035 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
5036 } else {
5037 if (netp && *netp)
5038 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5039 num_seg, 0, num_dup, &abort_now, flags,
5040 cum_ack, a_rwnd, ecne_seen);
5041 }
5042 if (abort_now) {
5043 /* ABORT signal from sack processing */
5044 *offset = length;
5045 return (NULL);
5046 }
5047 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5048 TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5049 (stcb->asoc.stream_queue_cnt == 0)) {
5050 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5051 }
5052 }
5053 break;
5054 /* EY - nr_sack: If the received chunk is an nr_sack chunk */
5055 case SCTP_NR_SELECTIVE_ACK:
5056 {
5057 struct sctp_nr_sack_chunk *nr_sack;
5058 int abort_now = 0;
5059 uint32_t a_rwnd, cum_ack;
5060 uint16_t num_seg, num_nr_seg, num_dup;
5061 uint8_t flags;
5062 int offset_seg, offset_dup;
5063
5064 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
5065 SCTP_STAT_INCR(sctps_recvsacks);
5066 if (stcb == NULL) {
5067 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
5068 break;
5069 }
5070 if ((stcb->asoc.sctp_nr_sack_on_off == 0) ||
5071 (stcb->asoc.peer_supports_nr_sack == 0)) {
5072 goto unknown_chunk;
5073 }
5074 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5075 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
5076 break;
5077 }
5078 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5079 /*-
5080 * If we have sent a shutdown-ack, we will pay no
5081 * attention to a sack sent in to us since
5082 * we don't care anymore.
5083 */
5084 break;
5085 }
5086 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5087 flags = ch->chunk_flags;
5088 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5089 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5090 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5091 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5092 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
5093 if (sizeof(struct sctp_nr_sack_chunk) +
5094 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5095 num_dup * sizeof(uint32_t) != chk_length) {
5096 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5097 break;
5098 }
5099 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5100 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5101 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5102 cum_ack, num_seg, a_rwnd);
5103 stcb->asoc.seen_a_sack_this_pkt = 1;
5104 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5105 (num_seg == 0) && (num_nr_seg == 0) &&
5106 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5107 (stcb->asoc.saw_sack_with_frags == 0) &&
5108 (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5109 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5110 /*
5111 * We have a SIMPLE sack having no
5112 * prior segments and data on sent
5113 * queue to be acked. Use the
5114 * faster path sack processing. We
5115 * also allow window update sacks
5116 * with no missing segments to go
5117 * this way too.
5118 */
5119 sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5120 &abort_now, ecne_seen);
5121 } else {
5122 if (netp && *netp)
5123 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5124 num_seg, num_nr_seg, num_dup, &abort_now, flags,
5125 cum_ack, a_rwnd, ecne_seen);
5126 }
5127 if (abort_now) {
5128 /* ABORT signal from sack processing */
5129 *offset = length;
5130 return (NULL);
5131 }
5132 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5133 TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5134 (stcb->asoc.stream_queue_cnt == 0)) {
5135 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5136 }
5137 }
5138 break;
5139
5140 case SCTP_HEARTBEAT_REQUEST:
5141 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5142 if ((stcb) && netp && *netp) {
5143 SCTP_STAT_INCR(sctps_recvheartbeat);
5144 sctp_send_heartbeat_ack(stcb, m, *offset,
5145 chk_length, *netp);
5146
5147 /* He's alive so give him credit */
5148 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5149 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5150 stcb->asoc.overall_error_count,
5151 0,
5152 SCTP_FROM_SCTP_INPUT,
5153 __LINE__);
5154 }
5155 stcb->asoc.overall_error_count = 0;
5156 }
5157 break;
5158 case SCTP_HEARTBEAT_ACK:
5159 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5160 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5161 /* Its not ours */
5162 *offset = length;
5163 if (locked_tcb) {
5164 SCTP_TCB_UNLOCK(locked_tcb);
5165 }
5166 return (NULL);
5167 }
5168 /* He's alive so give him credit */
5169 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5170 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5171 stcb->asoc.overall_error_count,
5172 0,
5173 SCTP_FROM_SCTP_INPUT,
5174 __LINE__);
5175 }
5176 stcb->asoc.overall_error_count = 0;
5177 SCTP_STAT_INCR(sctps_recvheartbeatack);
5178 if (netp && *netp)
5179 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5180 stcb, *netp);
5181 break;
5182 case SCTP_ABORT_ASSOCIATION:
5183 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5184 (void *)stcb);
5185 if ((stcb) && netp && *netp)
5186 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5187 stcb, *netp);
5188 *offset = length;
5189 return (NULL);
5190 break;
5191 case SCTP_SHUTDOWN:
5192 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5193 (void *)stcb);
5194 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5195 *offset = length;
5196 if (locked_tcb) {
5197 SCTP_TCB_UNLOCK(locked_tcb);
5198 }
5199 return (NULL);
5200 }
5201 if (netp && *netp) {
5202 int abort_flag = 0;
5203
5204 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5205 stcb, *netp, &abort_flag);
5206 if (abort_flag) {
5207 *offset = length;
5208 return (NULL);
5209 }
5210 }
5211 break;
5212 case SCTP_SHUTDOWN_ACK:
5213 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5214 if ((stcb) && (netp) && (*netp))
5215 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5216 *offset = length;
5217 return (NULL);
5218 break;
5219
5220 case SCTP_OPERATION_ERROR:
5221 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5222 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5223 *offset = length;
5224 return (NULL);
5225 }
5226 break;
5227 case SCTP_COOKIE_ECHO:
5228 SCTPDBG(SCTP_DEBUG_INPUT3,
5229 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5230 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5231 ;
5232 } else {
5233 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5234 /* We are not interested anymore */
5235 abend:
5236 if (stcb) {
5237 SCTP_TCB_UNLOCK(stcb);
5238 }
5239 *offset = length;
5240 return (NULL);
5241 }
5242 }
5243 /*
5244 * First are we accepting? We do this again here
5245 * since it is possible that a previous endpoint WAS
5246 * listening responded to a INIT-ACK and then
5247 * closed. We opened and bound.. and are now no
5248 * longer listening.
5249 */
5250
5251 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5252 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5253 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5254 struct mbuf *op_err;
5255
5256 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
5257 sctp_abort_association(inp, stcb, m, iphlen,
5258 src, dst, sh, op_err,
5259 #if defined(__FreeBSD__)
5260 use_mflowid, mflowid,
5261 #endif
5262 vrf_id, port);
5263 }
5264 *offset = length;
5265 return (NULL);
5266 } else {
5267 struct mbuf *ret_buf;
5268 struct sctp_inpcb *linp;
5269 if (stcb) {
5270 linp = NULL;
5271 } else {
5272 linp = inp;
5273 }
5274
5275 if (linp) {
5276 SCTP_ASOC_CREATE_LOCK(linp);
5277 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5278 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5279 SCTP_ASOC_CREATE_UNLOCK(linp);
5280 goto abend;
5281 }
5282 }
5283
5284 if (netp) {
5285 ret_buf =
5286 sctp_handle_cookie_echo(m, iphlen,
5287 *offset,
5288 src, dst,
5289 sh,
5290 (struct sctp_cookie_echo_chunk *)ch,
5291 &inp, &stcb, netp,
5292 auth_skipped,
5293 auth_offset,
5294 auth_len,
5295 &locked_tcb,
5296 #if defined(__FreeBSD__)
5297 use_mflowid,
5298 mflowid,
5299 #endif
5300 vrf_id,
5301 port);
5302 } else {
5303 ret_buf = NULL;
5304 }
5305 if (linp) {
5306 SCTP_ASOC_CREATE_UNLOCK(linp);
5307 }
5308 if (ret_buf == NULL) {
5309 if (locked_tcb) {
5310 SCTP_TCB_UNLOCK(locked_tcb);
5311 }
5312 SCTPDBG(SCTP_DEBUG_INPUT3,
5313 "GAK, null buffer\n");
5314 *offset = length;
5315 return (NULL);
5316 }
5317 /* if AUTH skipped, see if it verified... */
5318 if (auth_skipped) {
5319 got_auth = 1;
5320 auth_skipped = 0;
5321 }
5322 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5323 /*
5324 * Restart the timer if we have
5325 * pending data
5326 */
5327 struct sctp_tmit_chunk *chk;
5328
5329 chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5330 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5331 }
5332 }
5333 break;
5334 case SCTP_COOKIE_ACK:
5335 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5336 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5337 if (locked_tcb) {
5338 SCTP_TCB_UNLOCK(locked_tcb);
5339 }
5340 return (NULL);
5341 }
5342 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5343 /* We are not interested anymore */
5344 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5345 ;
5346 } else if (stcb) {
5347 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5348 so = SCTP_INP_SO(inp);
5349 atomic_add_int(&stcb->asoc.refcnt, 1);
5350 SCTP_TCB_UNLOCK(stcb);
5351 SCTP_SOCKET_LOCK(so, 1);
5352 SCTP_TCB_LOCK(stcb);
5353 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5354 #endif
5355 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_27);
5356 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5357 SCTP_SOCKET_UNLOCK(so, 1);
5358 #endif
5359 *offset = length;
5360 return (NULL);
5361 }
5362 }
5363 /* He's alive so give him credit */
5364 if ((stcb) && netp && *netp) {
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_cookie_ack((struct sctp_cookie_ack_chunk *)ch,stcb, *netp);
5374 }
5375 break;
5376 case SCTP_ECN_ECHO:
5377 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5378 /* He's alive so give him credit */
5379 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5380 /* Its not ours */
5381 if (locked_tcb) {
5382 SCTP_TCB_UNLOCK(locked_tcb);
5383 }
5384 *offset = length;
5385 return (NULL);
5386 }
5387 if (stcb) {
5388 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5389 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5390 stcb->asoc.overall_error_count,
5391 0,
5392 SCTP_FROM_SCTP_INPUT,
5393 __LINE__);
5394 }
5395 stcb->asoc.overall_error_count = 0;
5396 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5397 stcb);
5398 ecne_seen = 1;
5399 }
5400 break;
5401 case SCTP_ECN_CWR:
5402 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5403 /* He's alive so give him credit */
5404 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5405 /* Its not ours */
5406 if (locked_tcb) {
5407 SCTP_TCB_UNLOCK(locked_tcb);
5408 }
5409 *offset = length;
5410 return (NULL);
5411 }
5412 if (stcb) {
5413 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5414 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5415 stcb->asoc.overall_error_count,
5416 0,
5417 SCTP_FROM_SCTP_INPUT,
5418 __LINE__);
5419 }
5420 stcb->asoc.overall_error_count = 0;
5421 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5422 }
5423 break;
5424 case SCTP_SHUTDOWN_COMPLETE:
5425 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5426 /* must be first and only chunk */
5427 if ((num_chunks > 1) ||
5428 (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5429 *offset = length;
5430 if (locked_tcb) {
5431 SCTP_TCB_UNLOCK(locked_tcb);
5432 }
5433 return (NULL);
5434 }
5435 if ((stcb) && netp && *netp) {
5436 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5437 stcb, *netp);
5438 }
5439 *offset = length;
5440 return (NULL);
5441 break;
5442 case SCTP_ASCONF:
5443 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5444 /* He's alive so give him credit */
5445 if (stcb) {
5446 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5447 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5448 stcb->asoc.overall_error_count,
5449 0,
5450 SCTP_FROM_SCTP_INPUT,
5451 __LINE__);
5452 }
5453 stcb->asoc.overall_error_count = 0;
5454 sctp_handle_asconf(m, *offset, src,
5455 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5456 asconf_cnt++;
5457 }
5458 break;
5459 case SCTP_ASCONF_ACK:
5460 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5461 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5462 /* Its not ours */
5463 if (locked_tcb) {
5464 SCTP_TCB_UNLOCK(locked_tcb);
5465 }
5466 *offset = length;
5467 return (NULL);
5468 }
5469 if ((stcb) && netp && *netp) {
5470 /* He's alive so give him credit */
5471 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5472 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5473 stcb->asoc.overall_error_count,
5474 0,
5475 SCTP_FROM_SCTP_INPUT,
5476 __LINE__);
5477 }
5478 stcb->asoc.overall_error_count = 0;
5479 sctp_handle_asconf_ack(m, *offset,
5480 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5481 if (abort_no_unlock)
5482 return (NULL);
5483 }
5484 break;
5485 case SCTP_FORWARD_CUM_TSN:
5486 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5487 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5488 /* Its not ours */
5489 if (locked_tcb) {
5490 SCTP_TCB_UNLOCK(locked_tcb);
5491 }
5492 *offset = length;
5493 return (NULL);
5494 }
5495
5496 /* He's alive so give him credit */
5497 if (stcb) {
5498 int abort_flag = 0;
5499 stcb->asoc.overall_error_count = 0;
5500 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5501 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5502 stcb->asoc.overall_error_count,
5503 0,
5504 SCTP_FROM_SCTP_INPUT,
5505 __LINE__);
5506 }
5507 *fwd_tsn_seen = 1;
5508 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5509 /* We are not interested anymore */
5510 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5511 so = SCTP_INP_SO(inp);
5512 atomic_add_int(&stcb->asoc.refcnt, 1);
5513 SCTP_TCB_UNLOCK(stcb);
5514 SCTP_SOCKET_LOCK(so, 1);
5515 SCTP_TCB_LOCK(stcb);
5516 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5517 #endif
5518 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_29);
5519 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5520 SCTP_SOCKET_UNLOCK(so, 1);
5521 #endif
5522 *offset = length;
5523 return (NULL);
5524 }
5525 sctp_handle_forward_tsn(stcb,
5526 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5527 if (abort_flag) {
5528 *offset = length;
5529 return (NULL);
5530 } else {
5531 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5532 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5533 stcb->asoc.overall_error_count,
5534 0,
5535 SCTP_FROM_SCTP_INPUT,
5536 __LINE__);
5537 }
5538 stcb->asoc.overall_error_count = 0;
5539 }
5540
5541 }
5542 break;
5543 case SCTP_STREAM_RESET:
5544 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5545 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5546 /* Its not ours */
5547 if (locked_tcb) {
5548 SCTP_TCB_UNLOCK(locked_tcb);
5549 }
5550 *offset = length;
5551 return (NULL);
5552 }
5553 if (stcb->asoc.peer_supports_strreset == 0) {
5554 /*
5555 * hmm, peer should have announced this, but
5556 * we will turn it on since he is sending us
5557 * a stream reset.
5558 */
5559 stcb->asoc.peer_supports_strreset = 1;
5560 }
5561 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5562 /* stop processing */
5563 *offset = length;
5564 return (NULL);
5565 }
5566 break;
5567 case SCTP_PACKET_DROPPED:
5568 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5569 /* re-get it all please */
5570 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5571 /* Its not ours */
5572 if (locked_tcb) {
5573 SCTP_TCB_UNLOCK(locked_tcb);
5574 }
5575 *offset = length;
5576 return (NULL);
5577 }
5578
5579
5580 if (ch && (stcb) && netp && (*netp)) {
5581 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5582 stcb, *netp,
5583 min(chk_length, (sizeof(chunk_buf) - 4)));
5584
5585 }
5586
5587 break;
5588
5589 case SCTP_AUTHENTICATION:
5590 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5591 if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5592 goto unknown_chunk;
5593
5594 if (stcb == NULL) {
5595 /* save the first AUTH for later processing */
5596 if (auth_skipped == 0) {
5597 auth_offset = *offset;
5598 auth_len = chk_length;
5599 auth_skipped = 1;
5600 }
5601 /* skip this chunk (temporarily) */
5602 goto next_chunk;
5603 }
5604 if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5605 (chk_length > (sizeof(struct sctp_auth_chunk) +
5606 SCTP_AUTH_DIGEST_LEN_MAX))) {
5607 /* Its not ours */
5608 if (locked_tcb) {
5609 SCTP_TCB_UNLOCK(locked_tcb);
5610 }
5611 *offset = length;
5612 return (NULL);
5613 }
5614 if (got_auth == 1) {
5615 /* skip this chunk... it's already auth'd */
5616 goto next_chunk;
5617 }
5618 got_auth = 1;
5619 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5620 m, *offset)) {
5621 /* auth HMAC failed so dump the packet */
5622 *offset = length;
5623 return (stcb);
5624 } else {
5625 /* remaining chunks are HMAC checked */
5626 stcb->asoc.authenticated = 1;
5627 }
5628 break;
5629
5630 default:
5631 unknown_chunk:
5632 /* it's an unknown chunk! */
5633 if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5634 struct mbuf *mm;
5635 struct sctp_paramhdr *phd;
5636
5637 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5638 0, M_NOWAIT, 1, MT_DATA);
5639 if (mm) {
5640 phd = mtod(mm, struct sctp_paramhdr *);
5641 /*
5642 * We cheat and use param type since
5643 * we did not bother to define a
5644 * error cause struct. They are the
5645 * same basic format with different
5646 * names.
5647 */
5648 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5649 phd->param_length = htons(chk_length + sizeof(*phd));
5650 SCTP_BUF_LEN(mm) = sizeof(*phd);
5651 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT);
5652 if (SCTP_BUF_NEXT(mm)) {
5653 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) {
5654 sctp_m_freem(mm);
5655 } else {
5656 #ifdef SCTP_MBUF_LOGGING
5657 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5658 struct mbuf *mat;
5659
5660 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) {
5661 if (SCTP_BUF_IS_EXTENDED(mat)) {
5662 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5663 }
5664 }
5665 }
5666 #endif
5667 sctp_queue_op_err(stcb, mm);
5668 }
5669 } else {
5670 sctp_m_freem(mm);
5671 }
5672 }
5673 }
5674 if ((ch->chunk_type & 0x80) == 0) {
5675 /* discard this packet */
5676 *offset = length;
5677 return (stcb);
5678 } /* else skip this bad chunk and continue... */
5679 break;
5680 } /* switch (ch->chunk_type) */
5681
5682
5683 next_chunk:
5684 /* get the next chunk */
5685 *offset += SCTP_SIZE32(chk_length);
5686 if (*offset >= length) {
5687 /* no more data left in the mbuf chain */
5688 break;
5689 }
5690 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5691 sizeof(struct sctp_chunkhdr), chunk_buf);
5692 if (ch == NULL) {
5693 if (locked_tcb) {
5694 SCTP_TCB_UNLOCK(locked_tcb);
5695 }
5696 *offset = length;
5697 return (NULL);
5698 }
5699 } /* while */
5700
5701 if (asconf_cnt > 0 && stcb != NULL) {
5702 sctp_send_asconf_ack(stcb);
5703 }
5704 return (stcb);
5705 }
5706
5707
5708 #ifdef INVARIANTS
5709 #ifdef __GNUC__
5710 __attribute__((noinline))
5711 #endif
5712 void
5713 sctp_validate_no_locks(struct sctp_inpcb *inp)
5714 {
5715 #ifndef __APPLE__
5716 struct sctp_tcb *lstcb;
5717
5718 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5719 if (mtx_owned(&lstcb->tcb_mtx)) {
5720 panic("Own lock on stcb at return from input");
5721 }
5722 }
5723 if (mtx_owned(&inp->inp_create_mtx)) {
5724 panic("Own create lock on inp");
5725 }
5726 if (mtx_owned(&inp->inp_mtx)) {
5727 panic("Own inp lock on inp");
5728 }
5729 #endif
5730 }
5731 #endif
5732
5733 /*
5734 * common input chunk processing (v4 and v6)
5735 */
5736 void
5737 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5738 struct sockaddr *src, struct sockaddr *dst,
5739 struct sctphdr *sh, struct sctp_chunkhdr *ch,
5740 #if !defined(SCTP_WITH_NO_CSUM)
5741 uint8_t compute_crc,
5742 #endif
5743 uint8_t ecn_bits,
5744 #if defined(__FreeBSD__)
5745 uint8_t use_mflowid, uint32_t mflowid,
5746 #endif
5747 uint32_t vrf_id, uint16_t port)
5748 {
5749 uint32_t high_tsn;
5750 int fwd_tsn_seen = 0, data_processed = 0;
5751 struct mbuf *m = *mm;
5752 int un_sent;
5753 int cnt_ctrl_ready = 0;
5754 struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5755 struct sctp_tcb *stcb = NULL;
5756 struct sctp_nets *net = NULL;
5757
5758 SCTP_STAT_INCR(sctps_recvdatagrams);
5759 #ifdef SCTP_AUDITING_ENABLED
5760 sctp_audit_log(0xE0, 1);
5761 sctp_auditing(0, inp, stcb, net);
5762 #endif
5763 #if !defined(SCTP_WITH_NO_CSUM)
5764 if (compute_crc != 0) {
5765 uint32_t check, calc_check;
5766
5767 check = sh->checksum;
5768 sh->checksum = 0;
5769 calc_check = sctp_calculate_cksum(m, iphlen);
5770 sh->checksum = check;
5771 if (calc_check != check) {
5772 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n",
5773 calc_check, check, (void *)m, length, iphlen);
5774 stcb = sctp_findassociation_addr(m, offset, src, dst,
5775 sh, ch, &inp, &net, vrf_id);
5776 if ((net != NULL) && (port != 0)) {
5777 if (net->port == 0) {
5778 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5779 }
5780 net->port = port;
5781 }
5782 #if defined(__FreeBSD__)
5783 if ((net != NULL) && (use_mflowid != 0)) {
5784 net->flowid = mflowid;
5785 #ifdef INVARIANTS
5786 net->flowidset = 1;
5787 #endif
5788 }
5789 #endif
5790 if ((inp != NULL) && (stcb != NULL)) {
5791 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5792 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5793 } else if ((inp != NULL) && (stcb == NULL)) {
5794 inp_decr = inp;
5795 }
5796 SCTP_STAT_INCR(sctps_badsum);
5797 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5798 goto out;
5799 }
5800 }
5801 #endif
5802 /* Destination port of 0 is illegal, based on RFC4960. */
5803 if (sh->dest_port == 0) {
5804 SCTP_STAT_INCR(sctps_hdrops);
5805 goto out;
5806 }
5807 stcb = sctp_findassociation_addr(m, offset, src, dst,
5808 sh, ch, &inp, &net, vrf_id);
5809 if ((net != NULL) && (port != 0)) {
5810 if (net->port == 0) {
5811 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5812 }
5813 net->port = port;
5814 }
5815 #if defined(__FreeBSD__)
5816 if ((net != NULL) && (use_mflowid != 0)) {
5817 net->flowid = mflowid;
5818 #ifdef INVARIANTS
5819 net->flowidset = 1;
5820 #endif
5821 }
5822 #endif
5823 if (inp == NULL) {
5824 SCTP_STAT_INCR(sctps_noport);
5825 #if defined(__FreeBSD__) && (((__FreeBSD_version < 900000) && (__FreeBSD_version >= 804000)) || (__FreeBSD_version > 900000))
5826 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5827 goto out;
5828 }
5829 #endif
5830 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5831 sctp_send_shutdown_complete2(src, dst, sh,
5832 #if defined(__FreeBSD__)
5833 use_mflowid, mflowid,
5834 #endif
5835 vrf_id, port);
5836 goto out;
5837 }
5838 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5839 goto out;
5840 }
5841 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5842 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5843 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5844 (ch->chunk_type != SCTP_INIT))) {
5845 sctp_send_abort(m, iphlen, src, dst,
5846 sh, 0, NULL,
5847 #if defined(__FreeBSD__)
5848 use_mflowid, mflowid,
5849 #endif
5850 vrf_id, port);
5851 }
5852 }
5853 goto out;
5854 } else if (stcb == NULL) {
5855 inp_decr = inp;
5856 }
5857 #ifdef IPSEC
5858 /*-
5859 * I very much doubt any of the IPSEC stuff will work but I have no
5860 * idea, so I will leave it in place.
5861 */
5862 if (inp != NULL) {
5863 switch (dst->sa_family) {
5864 #ifdef INET
5865 case AF_INET:
5866 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5867 #if defined(__FreeBSD__) && (__FreeBSD_version > 1000036)
5868 IPSECSTAT_INC(ips_in_polvio);
5869 #else
5870 MODULE_GLOBAL(ipsec4stat).in_polvio++;
5871 #endif
5872 SCTP_STAT_INCR(sctps_hdrops);
5873 goto out;
5874 }
5875 break;
5876 #endif
5877 #ifdef INET6
5878 case AF_INET6:
5879 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5880 #if defined(__FreeBSD__) && (__FreeBSD_version > 1000036)
5881 IPSEC6STAT_INC(ips_in_polvio);
5882 #else
5883 MODULE_GLOBAL(ipsec6stat).in_polvio++;
5884 #endif
5885 SCTP_STAT_INCR(sctps_hdrops);
5886 goto out;
5887 }
5888 break;
5889 #endif
5890 default:
5891 break;
5892 }
5893 }
5894 #endif
5895 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5896 (void *)m, iphlen, offset, length, (void *)stcb);
5897 if (stcb) {
5898 /* always clear this before beginning a packet */
5899 stcb->asoc.authenticated = 0;
5900 stcb->asoc.seen_a_sack_this_pkt = 0;
5901 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5902 (void *)stcb, stcb->asoc.state);
5903
5904 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5905 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5906 /*-
5907 * If we hit here, we had a ref count
5908 * up when the assoc was aborted and the
5909 * timer is clearing out the assoc, we should
5910 * NOT respond to any packet.. its OOTB.
5911 */
5912 SCTP_TCB_UNLOCK(stcb);
5913 stcb = NULL;
5914 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
5915 #if defined(__FreeBSD__)
5916 use_mflowid, mflowid,
5917 #endif
5918 vrf_id, port);
5919 goto out;
5920 }
5921
5922 }
5923 if (IS_SCTP_CONTROL(ch)) {
5924 /* process the control portion of the SCTP packet */
5925 /* sa_ignore NO_NULL_CHK */
5926 stcb = sctp_process_control(m, iphlen, &offset, length,
5927 src, dst, sh, ch,
5928 inp, stcb, &net, &fwd_tsn_seen,
5929 #if defined(__FreeBSD__)
5930 use_mflowid, mflowid,
5931 #endif
5932 vrf_id, port);
5933 if (stcb) {
5934 /* This covers us if the cookie-echo was there
5935 * and it changes our INP.
5936 */
5937 inp = stcb->sctp_ep;
5938 if ((net) && (port)) {
5939 if (net->port == 0) {
5940 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5941 }
5942 net->port = port;
5943 }
5944 }
5945 } else {
5946 /*
5947 * no control chunks, so pre-process DATA chunks (these
5948 * checks are taken care of by control processing)
5949 */
5950
5951 /*
5952 * if DATA only packet, and auth is required, then punt...
5953 * can't have authenticated without any AUTH (control)
5954 * chunks
5955 */
5956 if ((stcb != NULL) &&
5957 !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5958 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5959 /* "silently" ignore */
5960 SCTP_STAT_INCR(sctps_recvauthmissing);
5961 goto out;
5962 }
5963 if (stcb == NULL) {
5964 /* out of the blue DATA chunk */
5965 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
5966 #if defined(__FreeBSD__)
5967 use_mflowid, mflowid,
5968 #endif
5969 vrf_id, port);
5970 goto out;
5971 }
5972 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5973 /* v_tag mismatch! */
5974 SCTP_STAT_INCR(sctps_badvtag);
5975 goto out;
5976 }
5977 }
5978
5979 if (stcb == NULL) {
5980 /*
5981 * no valid TCB for this packet, or we found it's a bad
5982 * packet while processing control, or we're done with this
5983 * packet (done or skip rest of data), so we drop it...
5984 */
5985 goto out;
5986 }
5987
5988 /*
5989 * DATA chunk processing
5990 */
5991 /* plow through the data chunks while length > offset */
5992
5993 /*
5994 * Rest should be DATA only. Check authentication state if AUTH for
5995 * DATA is required.
5996 */
5997 if ((length > offset) &&
5998 (stcb != NULL) &&
5999 !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
6000 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
6001 !stcb->asoc.authenticated) {
6002 /* "silently" ignore */
6003 SCTP_STAT_INCR(sctps_recvauthmissing);
6004 SCTPDBG(SCTP_DEBUG_AUTH1,
6005 "Data chunk requires AUTH, skipped\n");
6006 goto trigger_send;
6007 }
6008 if (length > offset) {
6009 int retval;
6010
6011 /*
6012 * First check to make sure our state is correct. We would
6013 * not get here unless we really did have a tag, so we don't
6014 * abort if this happens, just dump the chunk silently.
6015 */
6016 switch (SCTP_GET_STATE(&stcb->asoc)) {
6017 case SCTP_STATE_COOKIE_ECHOED:
6018 /*
6019 * we consider data with valid tags in this state
6020 * shows us the cookie-ack was lost. Imply it was
6021 * there.
6022 */
6023 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
6024 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
6025 stcb->asoc.overall_error_count,
6026 0,
6027 SCTP_FROM_SCTP_INPUT,
6028 __LINE__);
6029 }
6030 stcb->asoc.overall_error_count = 0;
6031 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
6032 break;
6033 case SCTP_STATE_COOKIE_WAIT:
6034 /*
6035 * We consider OOTB any data sent during asoc setup.
6036 */
6037 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp,
6038 #if defined(__FreeBSD__)
6039 use_mflowid, mflowid,
6040 #endif
6041 vrf_id, port);
6042 goto out;
6043 /*sa_ignore NOTREACHED*/
6044 break;
6045 case SCTP_STATE_EMPTY: /* should not happen */
6046 case SCTP_STATE_INUSE: /* should not happen */
6047 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */
6048 case SCTP_STATE_SHUTDOWN_ACK_SENT:
6049 default:
6050 goto out;
6051 /*sa_ignore NOTREACHED*/
6052 break;
6053 case SCTP_STATE_OPEN:
6054 case SCTP_STATE_SHUTDOWN_SENT:
6055 break;
6056 }
6057 /* plow through the data chunks while length > offset */
6058 retval = sctp_process_data(mm, iphlen, &offset, length,
6059 src, dst, sh,
6060 inp, stcb, net, &high_tsn,
6061 #if defined(__FreeBSD__)
6062 use_mflowid, mflowid,
6063 #endif
6064 vrf_id, port);
6065 if (retval == 2) {
6066 /*
6067 * The association aborted, NO UNLOCK needed since
6068 * the association is destroyed.
6069 */
6070 stcb = NULL;
6071 goto out;
6072 }
6073 data_processed = 1;
6074 /*
6075 * Anything important needs to have been m_copy'ed in
6076 * process_data
6077 */
6078 }
6079
6080 /* take care of ecn */
6081 if ((data_processed == 1) &&
6082 (stcb->asoc.ecn_allowed == 1) &&
6083 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
6084 /* Yep, we need to add a ECNE */
6085 sctp_send_ecn_echo(stcb, net, high_tsn);
6086 }
6087
6088 if ((data_processed == 0) && (fwd_tsn_seen)) {
6089 int was_a_gap;
6090 uint32_t highest_tsn;
6091
6092 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
6093 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
6094 } else {
6095 highest_tsn = stcb->asoc.highest_tsn_inside_map;
6096 }
6097 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
6098 stcb->asoc.send_sack = 1;
6099 sctp_sack_check(stcb, was_a_gap);
6100 } else if (fwd_tsn_seen) {
6101 stcb->asoc.send_sack = 1;
6102 }
6103 /* trigger send of any chunks in queue... */
6104 trigger_send:
6105 #ifdef SCTP_AUDITING_ENABLED
6106 sctp_audit_log(0xE0, 2);
6107 sctp_auditing(1, inp, stcb, net);
6108 #endif
6109 SCTPDBG(SCTP_DEBUG_INPUT1,
6110 "Check for chunk output prw:%d tqe:%d tf=%d\n",
6111 stcb->asoc.peers_rwnd,
6112 TAILQ_EMPTY(&stcb->asoc.control_send_queue),
6113 stcb->asoc.total_flight);
6114 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
6115 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
6116 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
6117 }
6118 if (cnt_ctrl_ready ||
6119 ((un_sent) &&
6120 (stcb->asoc.peers_rwnd > 0 ||
6121 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
6122 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
6123 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
6124 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6125 }
6126 #ifdef SCTP_AUDITING_ENABLED
6127 sctp_audit_log(0xE0, 3);
6128 sctp_auditing(2, inp, stcb, net);
6129 #endif
6130 out:
6131 if (stcb != NULL) {
6132 SCTP_TCB_UNLOCK(stcb);
6133 }
6134 if (inp_decr != NULL) {
6135 /* reduce ref-count */
6136 SCTP_INP_WLOCK(inp_decr);
6137 SCTP_INP_DECR_REF(inp_decr);
6138 SCTP_INP_WUNLOCK(inp_decr);
6139 }
6140 #ifdef INVARIANTS
6141 if (inp != NULL) {
6142 sctp_validate_no_locks(inp);
6143 }
6144 #endif
6145 return;
6146 }
6147
6148 #if 0
6149 static void
6150 sctp_print_mbuf_chain(struct mbuf *m)
6151 {
6152 for (; m; m = SCTP_BUF_NEXT(m)) {
6153 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
6154 if (SCTP_BUF_IS_EXTENDED(m))
6155 SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
6156 }
6157 }
6158 #endif
6159
6160 #ifdef INET
6161 #if !defined(__Userspace__)
6162 #if defined(__FreeBSD__) || defined(__APPLE__) || defined(__Windows__)
6163 void
6164 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6165 #elif defined(__Panda__)
6166 void
6167 sctp_input(pakhandle_type i_pak)
6168 #else
6169 void
6170 #if __STDC__
6171 sctp_input(struct mbuf *i_pak,...)
6172 #else
6173 sctp_input(i_pak, va_alist)
6174 struct mbuf *i_pak;
6175 #endif
6176 #endif
6177 {
6178 struct mbuf *m;
6179 int iphlen;
6180 uint32_t vrf_id = 0;
6181 uint8_t ecn_bits;
6182 struct sockaddr_in src, dst;
6183 struct ip *ip;
6184 struct sctphdr *sh;
6185 struct sctp_chunkhdr *ch;
6186 int length, offset;
6187 #if !defined(SCTP_WITH_NO_CSUM)
6188 uint8_t compute_crc;
6189 #endif
6190 #if defined(__FreeBSD__)
6191 uint32_t mflowid;
6192 uint8_t use_mflowid;
6193 #endif
6194 #if !(defined(__FreeBSD__) || defined(__APPLE__) || defined(__Windows__))
6195 uint16_t port = 0;
6196 #endif
6197
6198 #if defined(__Panda__)
6199 /* This is Evil, but its the only way to make panda work right. */
6200 iphlen = sizeof(struct ip);
6201 #else
6202 iphlen = off;
6203 #endif
6204 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6205 SCTP_RELEASE_PKT(i_pak);
6206 return;
6207 }
6208 m = SCTP_HEADER_TO_CHAIN(i_pak);
6209 #ifdef __Panda__
6210 SCTP_DETACH_HEADER_FROM_CHAIN(i_pak);
6211 (void)SCTP_RELEASE_HEADER(i_pak);
6212 #endif
6213 #ifdef SCTP_MBUF_LOGGING
6214 /* Log in any input mbufs */
6215 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6216 struct mbuf *mat;
6217
6218 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6219 if (SCTP_BUF_IS_EXTENDED(mat)) {
6220 sctp_log_mb(mat, SCTP_MBUF_INPUT);
6221 }
6222 }
6223 }
6224 #endif
6225 #ifdef SCTP_PACKET_LOGGING
6226 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6227 sctp_packet_log(m);
6228 }
6229 #endif
6230 #if defined(__FreeBSD__)
6231 #if __FreeBSD_version > 1000049
6232 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6233 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6234 m->m_pkthdr.len,
6235 if_name(m->m_pkthdr.rcvif),
6236 (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6237 #elif __FreeBSD_version >= 800000
6238 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6239 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
6240 m->m_pkthdr.len,
6241 if_name(m->m_pkthdr.rcvif),
6242 m->m_pkthdr.csum_flags);
6243 #else
6244 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6245 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
6246 m->m_pkthdr.len,
6247 m->m_pkthdr.rcvif->if_xname,
6248 m->m_pkthdr.csum_flags);
6249 #endif
6250 #endif
6251 #if defined(__APPLE__)
6252 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6253 "sctp_input(): Packet of length %d received on %s%d with csum_flags 0x%x.\n",
6254 m->m_pkthdr.len,
6255 m->m_pkthdr.rcvif->if_name,
6256 m->m_pkthdr.rcvif->if_unit,
6257 m->m_pkthdr.csum_flags);
6258 #endif
6259 #if defined(__Windows__)
6260 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6261 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
6262 m->m_pkthdr.len,
6263 m->m_pkthdr.rcvif->if_xname,
6264 m->m_pkthdr.csum_flags);
6265 #endif
6266 #if defined(__FreeBSD__)
6267 if (m->m_flags & M_FLOWID) {
6268 mflowid = m->m_pkthdr.flowid;
6269 use_mflowid = 1;
6270 } else {
6271 mflowid = 0;
6272 use_mflowid = 0;
6273 }
6274 #endif
6275 SCTP_STAT_INCR(sctps_recvpackets);
6276 SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6277 /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6278 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6279 if (SCTP_BUF_LEN(m) < offset) {
6280 if ((m = m_pullup(m, offset)) == NULL) {
6281 SCTP_STAT_INCR(sctps_hdrops);
6282 return;
6283 }
6284 }
6285 ip = mtod(m, struct ip *);
6286 sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6287 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6288 offset -= sizeof(struct sctp_chunkhdr);
6289 memset(&src, 0, sizeof(struct sockaddr_in));
6290 src.sin_family = AF_INET;
6291 #ifdef HAVE_SIN_LEN
6292 src.sin_len = sizeof(struct sockaddr_in);
6293 #endif
6294 src.sin_port = sh->src_port;
6295 src.sin_addr = ip->ip_src;
6296 memset(&dst, 0, sizeof(struct sockaddr_in));
6297 dst.sin_family = AF_INET;
6298 #ifdef HAVE_SIN_LEN
6299 dst.sin_len = sizeof(struct sockaddr_in);
6300 #endif
6301 dst.sin_port = sh->dest_port;
6302 dst.sin_addr = ip->ip_dst;
6303 #if defined(__Windows__)
6304 NTOHS(ip->ip_len);
6305 #endif
6306 #if defined(__Userspace_os_Linux) || defined(__Userspace_os_Windows)
6307 ip->ip_len = ntohs(ip->ip_len);
6308 #endif
6309 #if defined(__FreeBSD__)
6310 #if __FreeBSD_version >= 1000000
6311 length = ntohs(ip->ip_len);
6312 #else
6313 length = ip->ip_len + iphlen;
6314 #endif
6315 #elif defined(__APPLE__)
6316 length = ip->ip_len + iphlen;
6317 #elif defined(__Userspace__)
6318 #if defined(__Userspace_os_Linux) || defined(__Userspace_os_Windows)
6319 length = ip->ip_len;
6320 #else
6321 length = ip->ip_len + iphlen;
6322 #endif
6323 #else
6324 length = ip->ip_len;
6325 #endif
6326 /* Validate mbuf chain length with IP payload length. */
6327 if (SCTP_HEADER_LEN(m) != length) {
6328 SCTPDBG(SCTP_DEBUG_INPUT1,
6329 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6330 SCTP_STAT_INCR(sctps_hdrops);
6331 goto out;
6332 }
6333 /* SCTP does not allow broadcasts or multicasts */
6334 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6335 goto out;
6336 }
6337 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6338 goto out;
6339 }
6340 ecn_bits = ip->ip_tos;
6341 #if defined(SCTP_WITH_NO_CSUM)
6342 SCTP_STAT_INCR(sctps_recvnocrc);
6343 #else
6344 #if defined(__FreeBSD__) && __FreeBSD_version >= 800000
6345 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6346 SCTP_STAT_INCR(sctps_recvhwcrc);
6347 compute_crc = 0;
6348 } else {
6349 #else
6350 if (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
6351 ((src.sin_addr.s_addr == dst.sin_addr.s_addr) ||
6352 (SCTP_IS_IT_LOOPBACK(m)))) {
6353 SCTP_STAT_INCR(sctps_recvnocrc);
6354 compute_crc = 0;
6355 } else {
6356 #endif
6357 SCTP_STAT_INCR(sctps_recvswcrc);
6358 compute_crc = 1;
6359 }
6360 #endif
6361 sctp_common_input_processing(&m, iphlen, offset, length,
6362 (struct sockaddr *)&src,
6363 (struct sockaddr *)&dst,
6364 sh, ch,
6365 #if !defined(SCTP_WITH_NO_CSUM)
6366 compute_crc,
6367 #endif
6368 ecn_bits,
6369 #if defined(__FreeBSD__)
6370 use_mflowid, mflowid,
6371 #endif
6372 vrf_id, port);
6373 out:
6374 if (m) {
6375 sctp_m_freem(m);
6376 }
6377 return;
6378 }
6379
6380 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6381 extern int *sctp_cpuarry;
6382 #endif
6383
6384 void
6385 sctp_input(struct mbuf *m, int off)
6386 {
6387 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6388 struct ip *ip;
6389 struct sctphdr *sh;
6390 int offset;
6391 int cpu_to_use;
6392 uint32_t flowid, tag;
6393
6394 if (mp_ncpus > 1) {
6395 if (m->m_flags & M_FLOWID) {
6396 flowid = m->m_pkthdr.flowid;
6397 } else {
6398 /* No flow id built by lower layers
6399 * fix it so we create one.
6400 */
6401 offset = off + sizeof(struct sctphdr);
6402 if (SCTP_BUF_LEN(m) < offset) {
6403 if ((m = m_pullup(m, offset)) == NULL) {
6404 SCTP_STAT_INCR(sctps_hdrops);
6405 return;
6406 }
6407 }
6408 ip = mtod(m, struct ip *);
6409 sh = (struct sctphdr *)((caddr_t)ip + off);
6410 tag = htonl(sh->v_tag);
6411 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6412 m->m_pkthdr.flowid = flowid;
6413 m->m_flags |= M_FLOWID;
6414 }
6415 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6416 sctp_queue_to_mcore(m, off, cpu_to_use);
6417 return;
6418 }
6419 #endif
6420 sctp_input_with_port(m, off, 0);
6421 }
6422 #endif
6423 #endif

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