xref: /freebsd/sys/netinet/sctp_input.c (revision 9e5787d2284e187abb5b654d924394a65772e004)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions are met:
10  *
11  * a) Redistributions of source code must retain the above copyright notice,
12  *    this list of conditions and the following disclaimer.
13  *
14  * b) Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in
16  *    the documentation and/or other materials provided with the distribution.
17  *
18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
19  *    contributors may be used to endorse or promote products derived
20  *    from this software without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
32  * THE POSSIBILITY OF SUCH DAMAGE.
33  */
34 
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37 
38 #include <netinet/sctp_os.h>
39 #include <netinet/sctp_var.h>
40 #include <netinet/sctp_sysctl.h>
41 #include <netinet/sctp_pcb.h>
42 #include <netinet/sctp_header.h>
43 #include <netinet/sctputil.h>
44 #include <netinet/sctp_output.h>
45 #include <netinet/sctp_input.h>
46 #include <netinet/sctp_auth.h>
47 #include <netinet/sctp_indata.h>
48 #include <netinet/sctp_asconf.h>
49 #include <netinet/sctp_bsd_addr.h>
50 #include <netinet/sctp_timer.h>
51 #include <netinet/sctp_crc32.h>
52 #include <netinet/sctp_kdtrace.h>
53 #if defined(INET) || defined(INET6)
54 #include <netinet/udp.h>
55 #endif
56 #include <sys/smp.h>
57 
58 static void
59 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
60 {
61 	struct sctp_nets *net;
62 
63 	/*
64 	 * This now not only stops all cookie timers it also stops any INIT
65 	 * timers as well. This will make sure that the timers are stopped
66 	 * in all collision cases.
67 	 */
68 	SCTP_TCB_LOCK_ASSERT(stcb);
69 	TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
70 		if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
71 			sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
72 			    stcb->sctp_ep,
73 			    stcb,
74 			    net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
75 		} else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
76 			sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
77 			    stcb->sctp_ep,
78 			    stcb,
79 			    net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
80 		}
81 	}
82 }
83 
84 /* INIT handler */
85 static void
86 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
87     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
88     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
89     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
90     uint8_t mflowtype, uint32_t mflowid,
91     uint32_t vrf_id, uint16_t port)
92 {
93 	struct sctp_init *init;
94 	struct mbuf *op_err;
95 
96 	SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
97 	    (void *)stcb);
98 	if (stcb == NULL) {
99 		SCTP_INP_RLOCK(inp);
100 	}
101 	/* validate length */
102 	if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
103 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
104 		sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
105 		    mflowtype, mflowid,
106 		    vrf_id, port);
107 		if (stcb)
108 			*abort_no_unlock = 1;
109 		goto outnow;
110 	}
111 	/* validate parameters */
112 	init = &cp->init;
113 	if (init->initiate_tag == 0) {
114 		/* protocol error... send abort */
115 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
116 		sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
117 		    mflowtype, mflowid,
118 		    vrf_id, port);
119 		if (stcb)
120 			*abort_no_unlock = 1;
121 		goto outnow;
122 	}
123 	if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
124 		/* invalid parameter... send abort */
125 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
126 		sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
127 		    mflowtype, mflowid,
128 		    vrf_id, port);
129 		if (stcb)
130 			*abort_no_unlock = 1;
131 		goto outnow;
132 	}
133 	if (init->num_inbound_streams == 0) {
134 		/* protocol error... send abort */
135 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
136 		sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
137 		    mflowtype, mflowid,
138 		    vrf_id, port);
139 		if (stcb)
140 			*abort_no_unlock = 1;
141 		goto outnow;
142 	}
143 	if (init->num_outbound_streams == 0) {
144 		/* protocol error... send abort */
145 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
146 		sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
147 		    mflowtype, mflowid,
148 		    vrf_id, port);
149 		if (stcb)
150 			*abort_no_unlock = 1;
151 		goto outnow;
152 	}
153 	if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
154 	    offset + ntohs(cp->ch.chunk_length))) {
155 		/* auth parameter(s) error... send abort */
156 		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
157 		    "Problem with AUTH parameters");
158 		sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
159 		    mflowtype, mflowid,
160 		    vrf_id, port);
161 		if (stcb)
162 			*abort_no_unlock = 1;
163 		goto outnow;
164 	}
165 	/* We are only accepting if we have a listening socket. */
166 	if ((stcb == NULL) &&
167 	    ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
168 	    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
169 	    (!SCTP_IS_LISTENING(inp)))) {
170 		/*
171 		 * FIX ME ?? What about TCP model and we have a
172 		 * match/restart case? Actually no fix is needed. the lookup
173 		 * will always find the existing assoc so stcb would not be
174 		 * NULL. It may be questionable to do this since we COULD
175 		 * just send back the INIT-ACK and hope that the app did
176 		 * accept()'s by the time the COOKIE was sent. But there is
177 		 * a price to pay for COOKIE generation and I don't want to
178 		 * pay it on the chance that the app will actually do some
179 		 * accepts(). The App just looses and should NOT be in this
180 		 * state :-)
181 		 */
182 		if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
183 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
184 			    "No listener");
185 			sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
186 			    mflowtype, mflowid, inp->fibnum,
187 			    vrf_id, port);
188 		}
189 		goto outnow;
190 	}
191 	if ((stcb != NULL) &&
192 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
193 		SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
194 		sctp_send_shutdown_ack(stcb, NULL);
195 		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
196 	} else {
197 		SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
198 		sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
199 		    src, dst, sh, cp,
200 		    mflowtype, mflowid,
201 		    vrf_id, port);
202 	}
203 outnow:
204 	if (stcb == NULL) {
205 		SCTP_INP_RUNLOCK(inp);
206 	}
207 }
208 
209 /*
210  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
211  */
212 
213 int
214 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked)
215 {
216 	int unsent_data;
217 	unsigned int i;
218 	struct sctp_stream_queue_pending *sp;
219 	struct sctp_association *asoc;
220 
221 	/*
222 	 * This function returns if any stream has true unsent data on it.
223 	 * Note that as it looks through it will clean up any places that
224 	 * have old data that has been sent but left at top of stream queue.
225 	 */
226 	asoc = &stcb->asoc;
227 	unsent_data = 0;
228 	SCTP_TCB_SEND_LOCK(stcb);
229 	if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
230 		/* Check to see if some data queued */
231 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
232 			/* sa_ignore FREED_MEMORY */
233 			sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
234 			if (sp == NULL) {
235 				continue;
236 			}
237 			if ((sp->msg_is_complete) &&
238 			    (sp->length == 0) &&
239 			    (sp->sender_all_done)) {
240 				/*
241 				 * We are doing differed cleanup. Last time
242 				 * through when we took all the data the
243 				 * sender_all_done was not set.
244 				 */
245 				if (sp->put_last_out == 0) {
246 					SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
247 					SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
248 					    sp->sender_all_done,
249 					    sp->length,
250 					    sp->msg_is_complete,
251 					    sp->put_last_out);
252 				}
253 				atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
254 				TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
255 				stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
256 				if (sp->net) {
257 					sctp_free_remote_addr(sp->net);
258 					sp->net = NULL;
259 				}
260 				if (sp->data) {
261 					sctp_m_freem(sp->data);
262 					sp->data = NULL;
263 				}
264 				sctp_free_a_strmoq(stcb, sp, so_locked);
265 				if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
266 					unsent_data++;
267 				}
268 			} else {
269 				unsent_data++;
270 			}
271 			if (unsent_data > 0) {
272 				break;
273 			}
274 		}
275 	}
276 	SCTP_TCB_SEND_UNLOCK(stcb);
277 	return (unsent_data);
278 }
279 
280 static int
281 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
282 {
283 	struct sctp_init *init;
284 	struct sctp_association *asoc;
285 	struct sctp_nets *lnet;
286 	unsigned int i;
287 
288 	init = &cp->init;
289 	asoc = &stcb->asoc;
290 	/* save off parameters */
291 	asoc->peer_vtag = ntohl(init->initiate_tag);
292 	asoc->peers_rwnd = ntohl(init->a_rwnd);
293 	/* init tsn's */
294 	asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
295 
296 	if (!TAILQ_EMPTY(&asoc->nets)) {
297 		/* update any ssthresh's that may have a default */
298 		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
299 			lnet->ssthresh = asoc->peers_rwnd;
300 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
301 				sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
302 			}
303 
304 		}
305 	}
306 	SCTP_TCB_SEND_LOCK(stcb);
307 	if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
308 		unsigned int newcnt;
309 		struct sctp_stream_out *outs;
310 		struct sctp_stream_queue_pending *sp, *nsp;
311 		struct sctp_tmit_chunk *chk, *nchk;
312 
313 		/* abandon the upper streams */
314 		newcnt = ntohs(init->num_inbound_streams);
315 		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
316 			if (chk->rec.data.sid >= newcnt) {
317 				TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
318 				asoc->send_queue_cnt--;
319 				if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
320 					asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
321 #ifdef INVARIANTS
322 				} else {
323 					panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
324 #endif
325 				}
326 				if (chk->data != NULL) {
327 					sctp_free_bufspace(stcb, asoc, chk, 1);
328 					sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
329 					    0, chk, SCTP_SO_NOT_LOCKED);
330 					if (chk->data) {
331 						sctp_m_freem(chk->data);
332 						chk->data = NULL;
333 					}
334 				}
335 				sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
336 				/* sa_ignore FREED_MEMORY */
337 			}
338 		}
339 		if (asoc->strmout) {
340 			for (i = newcnt; i < asoc->pre_open_streams; i++) {
341 				outs = &asoc->strmout[i];
342 				TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
343 					atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
344 					TAILQ_REMOVE(&outs->outqueue, sp, next);
345 					stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
346 					sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
347 					    stcb, 0, sp, SCTP_SO_NOT_LOCKED);
348 					if (sp->data) {
349 						sctp_m_freem(sp->data);
350 						sp->data = NULL;
351 					}
352 					if (sp->net) {
353 						sctp_free_remote_addr(sp->net);
354 						sp->net = NULL;
355 					}
356 					/* Free the chunk */
357 					sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
358 					/* sa_ignore FREED_MEMORY */
359 				}
360 				outs->state = SCTP_STREAM_CLOSED;
361 			}
362 		}
363 		/* cut back the count */
364 		asoc->pre_open_streams = newcnt;
365 	}
366 	SCTP_TCB_SEND_UNLOCK(stcb);
367 	asoc->streamoutcnt = asoc->pre_open_streams;
368 	if (asoc->strmout) {
369 		for (i = 0; i < asoc->streamoutcnt; i++) {
370 			asoc->strmout[i].state = SCTP_STREAM_OPEN;
371 		}
372 	}
373 	/* EY - nr_sack: initialize highest tsn in nr_mapping_array */
374 	asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
375 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
376 		sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
377 	}
378 	/* This is the next one we expect */
379 	asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
380 
381 	asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
382 	asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
383 
384 	asoc->advanced_peer_ack_point = asoc->last_acked_seq;
385 	/* open the requested streams */
386 
387 	if (asoc->strmin != NULL) {
388 		/* Free the old ones */
389 		for (i = 0; i < asoc->streamincnt; i++) {
390 			sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
391 			sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
392 		}
393 		SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
394 	}
395 	if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
396 		asoc->streamincnt = ntohs(init->num_outbound_streams);
397 	} else {
398 		asoc->streamincnt = asoc->max_inbound_streams;
399 	}
400 	SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
401 	    sizeof(struct sctp_stream_in), SCTP_M_STRMI);
402 	if (asoc->strmin == NULL) {
403 		/* we didn't get memory for the streams! */
404 		SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
405 		return (-1);
406 	}
407 	for (i = 0; i < asoc->streamincnt; i++) {
408 		asoc->strmin[i].sid = i;
409 		asoc->strmin[i].last_mid_delivered = 0xffffffff;
410 		TAILQ_INIT(&asoc->strmin[i].inqueue);
411 		TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
412 		asoc->strmin[i].pd_api_started = 0;
413 		asoc->strmin[i].delivery_started = 0;
414 	}
415 	/*
416 	 * load_address_from_init will put the addresses into the
417 	 * association when the COOKIE is processed or the INIT-ACK is
418 	 * processed. Both types of COOKIE's existing and new call this
419 	 * routine. It will remove addresses that are no longer in the
420 	 * association (for the restarting case where addresses are
421 	 * removed). Up front when the INIT arrives we will discard it if it
422 	 * is a restart and new addresses have been added.
423 	 */
424 	/* sa_ignore MEMLEAK */
425 	return (0);
426 }
427 
428 /*
429  * INIT-ACK message processing/consumption returns value < 0 on error
430  */
431 static int
432 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
433     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
434     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
435     struct sctp_nets *net, int *abort_no_unlock,
436     uint8_t mflowtype, uint32_t mflowid,
437     uint32_t vrf_id)
438 {
439 	struct sctp_association *asoc;
440 	struct mbuf *op_err;
441 	int retval, abort_flag, cookie_found;
442 	int initack_limit;
443 	int nat_friendly = 0;
444 
445 	/* First verify that we have no illegal param's */
446 	abort_flag = 0;
447 	cookie_found = 0;
448 
449 	op_err = sctp_arethere_unrecognized_parameters(m,
450 	    (offset + sizeof(struct sctp_init_chunk)),
451 	    &abort_flag, (struct sctp_chunkhdr *)cp,
452 	    &nat_friendly, &cookie_found);
453 	if (abort_flag) {
454 		/* Send an abort and notify peer */
455 		sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
456 		*abort_no_unlock = 1;
457 		return (-1);
458 	}
459 	if (!cookie_found) {
460 		uint16_t len;
461 
462 		/* Only report the missing cookie parameter */
463 		if (op_err != NULL) {
464 			sctp_m_freem(op_err);
465 		}
466 		len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
467 		/* We abort with an error of missing mandatory param */
468 		op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
469 		if (op_err != NULL) {
470 			struct sctp_error_missing_param *cause;
471 
472 			SCTP_BUF_LEN(op_err) = len;
473 			cause = mtod(op_err, struct sctp_error_missing_param *);
474 			/* Subtract the reserved param */
475 			cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
476 			cause->cause.length = htons(len);
477 			cause->num_missing_params = htonl(1);
478 			cause->type[0] = htons(SCTP_STATE_COOKIE);
479 		}
480 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
481 		    src, dst, sh, op_err,
482 		    mflowtype, mflowid,
483 		    vrf_id, net->port);
484 		*abort_no_unlock = 1;
485 		return (-3);
486 	}
487 	asoc = &stcb->asoc;
488 	asoc->peer_supports_nat = (uint8_t)nat_friendly;
489 	/* process the peer's parameters in the INIT-ACK */
490 	retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
491 	if (retval < 0) {
492 		if (op_err != NULL) {
493 			sctp_m_freem(op_err);
494 		}
495 		return (retval);
496 	}
497 	initack_limit = offset + ntohs(cp->ch.chunk_length);
498 	/* load all addresses */
499 	if ((retval = sctp_load_addresses_from_init(stcb, m,
500 	    (offset + sizeof(struct sctp_init_chunk)), initack_limit,
501 	    src, dst, NULL, stcb->asoc.port))) {
502 		if (op_err != NULL) {
503 			sctp_m_freem(op_err);
504 		}
505 		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
506 		    "Problem with address parameters");
507 		SCTPDBG(SCTP_DEBUG_INPUT1,
508 		    "Load addresses from INIT causes an abort %d\n",
509 		    retval);
510 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
511 		    src, dst, sh, op_err,
512 		    mflowtype, mflowid,
513 		    vrf_id, net->port);
514 		*abort_no_unlock = 1;
515 		return (-1);
516 	}
517 	/* if the peer doesn't support asconf, flush the asconf queue */
518 	if (asoc->asconf_supported == 0) {
519 		struct sctp_asconf_addr *param, *nparam;
520 
521 		TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
522 			TAILQ_REMOVE(&asoc->asconf_queue, param, next);
523 			SCTP_FREE(param, SCTP_M_ASC_ADDR);
524 		}
525 	}
526 
527 	stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
528 	    stcb->asoc.local_hmacs);
529 	if (op_err) {
530 		sctp_queue_op_err(stcb, op_err);
531 		/* queuing will steal away the mbuf chain to the out queue */
532 		op_err = NULL;
533 	}
534 	/* extract the cookie and queue it to "echo" it back... */
535 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
536 		sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
537 		    stcb->asoc.overall_error_count,
538 		    0,
539 		    SCTP_FROM_SCTP_INPUT,
540 		    __LINE__);
541 	}
542 	stcb->asoc.overall_error_count = 0;
543 	net->error_count = 0;
544 
545 	/*
546 	 * Cancel the INIT timer, We do this first before queueing the
547 	 * cookie. We always cancel at the primary to assue that we are
548 	 * canceling the timer started by the INIT which always goes to the
549 	 * primary.
550 	 */
551 	sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
552 	    asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
553 
554 	/* calculate the RTO */
555 	sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
556 	    SCTP_RTT_FROM_NON_DATA);
557 	retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
558 	return (retval);
559 }
560 
561 static void
562 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
563     struct sctp_tcb *stcb, struct sctp_nets *net)
564 {
565 	union sctp_sockstore store;
566 	struct sctp_nets *r_net, *f_net;
567 	struct timeval tv;
568 	int req_prim = 0;
569 	uint16_t old_error_counter;
570 
571 	if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
572 		/* Invalid length */
573 		return;
574 	}
575 
576 	memset(&store, 0, sizeof(store));
577 	switch (cp->heartbeat.hb_info.addr_family) {
578 #ifdef INET
579 	case AF_INET:
580 		if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
581 			store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
582 			store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
583 			store.sin.sin_port = stcb->rport;
584 			memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
585 			    sizeof(store.sin.sin_addr));
586 		} else {
587 			return;
588 		}
589 		break;
590 #endif
591 #ifdef INET6
592 	case AF_INET6:
593 		if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
594 			store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
595 			store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
596 			store.sin6.sin6_port = stcb->rport;
597 			memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
598 		} else {
599 			return;
600 		}
601 		break;
602 #endif
603 	default:
604 		return;
605 	}
606 	r_net = sctp_findnet(stcb, &store.sa);
607 	if (r_net == NULL) {
608 		SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
609 		return;
610 	}
611 	if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
612 	    (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
613 	    (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
614 		/*
615 		 * If the its a HB and it's random value is correct when can
616 		 * confirm the destination.
617 		 */
618 		r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
619 		if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
620 			stcb->asoc.primary_destination = r_net;
621 			r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
622 			f_net = TAILQ_FIRST(&stcb->asoc.nets);
623 			if (f_net != r_net) {
624 				/*
625 				 * first one on the list is NOT the primary
626 				 * sctp_cmpaddr() is much more efficient if
627 				 * the primary is the first on the list,
628 				 * make it so.
629 				 */
630 				TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
631 				TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
632 			}
633 			req_prim = 1;
634 		}
635 		sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
636 		    stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
637 		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
638 		    r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
639 		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
640 	}
641 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
642 		sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
643 		    stcb->asoc.overall_error_count,
644 		    0,
645 		    SCTP_FROM_SCTP_INPUT,
646 		    __LINE__);
647 	}
648 	stcb->asoc.overall_error_count = 0;
649 	old_error_counter = r_net->error_count;
650 	r_net->error_count = 0;
651 	r_net->hb_responded = 1;
652 	tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
653 	tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
654 	/* Now lets do a RTO with this */
655 	sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
656 	    SCTP_RTT_FROM_NON_DATA);
657 	if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
658 		r_net->dest_state |= SCTP_ADDR_REACHABLE;
659 		sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
660 		    0, (void *)r_net, SCTP_SO_NOT_LOCKED);
661 	}
662 	if (r_net->dest_state & SCTP_ADDR_PF) {
663 		r_net->dest_state &= ~SCTP_ADDR_PF;
664 		stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
665 	}
666 	if (old_error_counter > 0) {
667 		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
668 		    stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
669 		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
670 	}
671 	if (r_net == stcb->asoc.primary_destination) {
672 		if (stcb->asoc.alternate) {
673 			/* release the alternate, primary is good */
674 			sctp_free_remote_addr(stcb->asoc.alternate);
675 			stcb->asoc.alternate = NULL;
676 		}
677 	}
678 	/* Mobility adaptation */
679 	if (req_prim) {
680 		if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
681 		    SCTP_MOBILITY_BASE) ||
682 		    sctp_is_mobility_feature_on(stcb->sctp_ep,
683 		    SCTP_MOBILITY_FASTHANDOFF)) &&
684 		    sctp_is_mobility_feature_on(stcb->sctp_ep,
685 		    SCTP_MOBILITY_PRIM_DELETED)) {
686 
687 			sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
688 			    stcb->sctp_ep, stcb, NULL,
689 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
690 			if (sctp_is_mobility_feature_on(stcb->sctp_ep,
691 			    SCTP_MOBILITY_FASTHANDOFF)) {
692 				sctp_assoc_immediate_retrans(stcb,
693 				    stcb->asoc.primary_destination);
694 			}
695 			if (sctp_is_mobility_feature_on(stcb->sctp_ep,
696 			    SCTP_MOBILITY_BASE)) {
697 				sctp_move_chunks_from_net(stcb,
698 				    stcb->asoc.deleted_primary);
699 			}
700 			sctp_delete_prim_timer(stcb->sctp_ep, stcb);
701 		}
702 	}
703 }
704 
705 static int
706 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
707 {
708 	/*
709 	 * Return 0 means we want you to proceed with the abort non-zero
710 	 * means no abort processing.
711 	 */
712 	uint32_t new_vtag;
713 	struct sctpasochead *head;
714 
715 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
716 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
717 		new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
718 		atomic_add_int(&stcb->asoc.refcnt, 1);
719 		SCTP_TCB_UNLOCK(stcb);
720 		SCTP_INP_INFO_WLOCK();
721 		SCTP_TCB_LOCK(stcb);
722 		atomic_subtract_int(&stcb->asoc.refcnt, 1);
723 	} else {
724 		return (0);
725 	}
726 	if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
727 		/* generate a new vtag and send init */
728 		LIST_REMOVE(stcb, sctp_asocs);
729 		stcb->asoc.my_vtag = new_vtag;
730 		head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
731 		/*
732 		 * put it in the bucket in the vtag hash of assoc's for the
733 		 * system
734 		 */
735 		LIST_INSERT_HEAD(head, stcb, sctp_asocs);
736 		SCTP_INP_INFO_WUNLOCK();
737 		sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
738 		return (1);
739 	} else {
740 		/*
741 		 * treat like a case where the cookie expired i.e.: - dump
742 		 * current cookie. - generate a new vtag. - resend init.
743 		 */
744 		/* generate a new vtag and send init */
745 		LIST_REMOVE(stcb, sctp_asocs);
746 		SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
747 		sctp_stop_all_cookie_timers(stcb);
748 		sctp_toss_old_cookies(stcb, &stcb->asoc);
749 		stcb->asoc.my_vtag = new_vtag;
750 		head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
751 		/*
752 		 * put it in the bucket in the vtag hash of assoc's for the
753 		 * system
754 		 */
755 		LIST_INSERT_HEAD(head, stcb, sctp_asocs);
756 		SCTP_INP_INFO_WUNLOCK();
757 		sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
758 		return (1);
759 	}
760 	return (0);
761 }
762 
763 static int
764 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
765     struct sctp_nets *net)
766 {
767 	/*
768 	 * return 0 means we want you to proceed with the abort non-zero
769 	 * means no abort processing
770 	 */
771 	if (stcb->asoc.auth_supported == 0) {
772 		SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
773 		return (0);
774 	}
775 	sctp_asconf_send_nat_state_update(stcb, net);
776 	return (1);
777 }
778 
779 
780 /* Returns 1 if the stcb was aborted, 0 otherwise */
781 static int
782 sctp_handle_abort(struct sctp_abort_chunk *abort,
783     struct sctp_tcb *stcb, struct sctp_nets *net)
784 {
785 	uint16_t len;
786 	uint16_t error;
787 
788 	SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
789 	if (stcb == NULL)
790 		return (0);
791 
792 	len = ntohs(abort->ch.chunk_length);
793 	if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
794 		/*
795 		 * Need to check the cause codes for our two magic nat
796 		 * aborts which don't kill the assoc necessarily.
797 		 */
798 		struct sctp_error_cause *cause;
799 
800 		cause = (struct sctp_error_cause *)(abort + 1);
801 		error = ntohs(cause->code);
802 		if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
803 			SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n",
804 			    abort->ch.chunk_flags);
805 			if (sctp_handle_nat_colliding_state(stcb)) {
806 				return (0);
807 			}
808 		} else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
809 			SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n",
810 			    abort->ch.chunk_flags);
811 			if (sctp_handle_nat_missing_state(stcb, net)) {
812 				return (0);
813 			}
814 		}
815 	} else {
816 		error = 0;
817 	}
818 	/* stop any receive timers */
819 	sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
820 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
821 	/* notify user of the abort and clean up... */
822 	sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
823 	/* free the tcb */
824 	SCTP_STAT_INCR_COUNTER32(sctps_aborted);
825 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
826 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
827 		SCTP_STAT_DECR_GAUGE32(sctps_currestab);
828 	}
829 #ifdef SCTP_ASOCLOG_OF_TSNS
830 	sctp_print_out_track_log(stcb);
831 #endif
832 	(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
833 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
834 	SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
835 	return (1);
836 }
837 
838 static void
839 sctp_start_net_timers(struct sctp_tcb *stcb)
840 {
841 	uint32_t cnt_hb_sent;
842 	struct sctp_nets *net;
843 
844 	cnt_hb_sent = 0;
845 	TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
846 		/*
847 		 * For each network start: 1) A pmtu timer. 2) A HB timer 3)
848 		 * If the dest in unconfirmed send a hb as well if under
849 		 * max_hb_burst have been sent.
850 		 */
851 		sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
852 		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
853 		if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
854 		    (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
855 			sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
856 			cnt_hb_sent++;
857 		}
858 	}
859 	if (cnt_hb_sent) {
860 		sctp_chunk_output(stcb->sctp_ep, stcb,
861 		    SCTP_OUTPUT_FROM_COOKIE_ACK,
862 		    SCTP_SO_NOT_LOCKED);
863 	}
864 }
865 
866 
867 static void
868 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
869     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
870 {
871 	struct sctp_association *asoc;
872 	int some_on_streamwheel;
873 	int old_state;
874 
875 	SCTPDBG(SCTP_DEBUG_INPUT2,
876 	    "sctp_handle_shutdown: handling SHUTDOWN\n");
877 	if (stcb == NULL)
878 		return;
879 	asoc = &stcb->asoc;
880 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
881 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
882 		return;
883 	}
884 	if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
885 		/* Shutdown NOT the expected size */
886 		return;
887 	}
888 	old_state = SCTP_GET_STATE(stcb);
889 	sctp_update_acked(stcb, cp, abort_flag);
890 	if (*abort_flag) {
891 		return;
892 	}
893 	if (asoc->control_pdapi) {
894 		/*
895 		 * With a normal shutdown we assume the end of last record.
896 		 */
897 		SCTP_INP_READ_LOCK(stcb->sctp_ep);
898 		if (asoc->control_pdapi->on_strm_q) {
899 			struct sctp_stream_in *strm;
900 
901 			strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
902 			if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
903 				/* Unordered */
904 				TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
905 				asoc->control_pdapi->on_strm_q = 0;
906 			} else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
907 				/* Ordered */
908 				TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
909 				asoc->control_pdapi->on_strm_q = 0;
910 #ifdef INVARIANTS
911 			} else {
912 				panic("Unknown state on ctrl:%p on_strm_q:%d",
913 				    asoc->control_pdapi,
914 				    asoc->control_pdapi->on_strm_q);
915 #endif
916 			}
917 		}
918 		asoc->control_pdapi->end_added = 1;
919 		asoc->control_pdapi->pdapi_aborted = 1;
920 		asoc->control_pdapi = NULL;
921 		SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
922 		if (stcb->sctp_socket) {
923 			sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
924 		}
925 	}
926 	/* goto SHUTDOWN_RECEIVED state to block new requests */
927 	if (stcb->sctp_socket) {
928 		if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
929 		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
930 		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
931 			SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
932 			/*
933 			 * notify upper layer that peer has initiated a
934 			 * shutdown
935 			 */
936 			sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
937 
938 			/* reset time */
939 			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
940 		}
941 	}
942 	if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
943 		/*
944 		 * stop the shutdown timer, since we WILL move to
945 		 * SHUTDOWN-ACK-SENT.
946 		 */
947 		sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
948 		    net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
949 	}
950 	/* Now is there unsent data on a stream somewhere? */
951 	some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
952 
953 	if (!TAILQ_EMPTY(&asoc->send_queue) ||
954 	    !TAILQ_EMPTY(&asoc->sent_queue) ||
955 	    some_on_streamwheel) {
956 		/* By returning we will push more data out */
957 		return;
958 	} else {
959 		/* no outstanding data to send, so move on... */
960 		/* send SHUTDOWN-ACK */
961 		/* move to SHUTDOWN-ACK-SENT state */
962 		if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
963 		    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
964 			SCTP_STAT_DECR_GAUGE32(sctps_currestab);
965 		}
966 		if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
967 			SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
968 			sctp_stop_timers_for_shutdown(stcb);
969 			sctp_send_shutdown_ack(stcb, net);
970 			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
971 			    stcb->sctp_ep, stcb, net);
972 		} else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
973 			sctp_send_shutdown_ack(stcb, net);
974 		}
975 	}
976 }
977 
978 static void
979 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
980     struct sctp_tcb *stcb,
981     struct sctp_nets *net)
982 {
983 	struct sctp_association *asoc;
984 
985 	SCTPDBG(SCTP_DEBUG_INPUT2,
986 	    "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
987 	if (stcb == NULL)
988 		return;
989 
990 	asoc = &stcb->asoc;
991 	/* process according to association state */
992 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
993 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
994 		/* unexpected SHUTDOWN-ACK... do OOTB handling... */
995 		sctp_send_shutdown_complete(stcb, net, 1);
996 		SCTP_TCB_UNLOCK(stcb);
997 		return;
998 	}
999 	if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
1000 	    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1001 		/* unexpected SHUTDOWN-ACK... so ignore... */
1002 		SCTP_TCB_UNLOCK(stcb);
1003 		return;
1004 	}
1005 	if (asoc->control_pdapi) {
1006 		/*
1007 		 * With a normal shutdown we assume the end of last record.
1008 		 */
1009 		SCTP_INP_READ_LOCK(stcb->sctp_ep);
1010 		asoc->control_pdapi->end_added = 1;
1011 		asoc->control_pdapi->pdapi_aborted = 1;
1012 		asoc->control_pdapi = NULL;
1013 		SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1014 		sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1015 	}
1016 #ifdef INVARIANTS
1017 	if (!TAILQ_EMPTY(&asoc->send_queue) ||
1018 	    !TAILQ_EMPTY(&asoc->sent_queue) ||
1019 	    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
1020 		panic("Queues are not empty when handling SHUTDOWN-ACK");
1021 	}
1022 #endif
1023 	/* stop the timer */
1024 	sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1025 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1026 	/* send SHUTDOWN-COMPLETE */
1027 	sctp_send_shutdown_complete(stcb, net, 0);
1028 	/* notify upper layer protocol */
1029 	if (stcb->sctp_socket) {
1030 		if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1031 		    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1032 			stcb->sctp_socket->so_snd.sb_cc = 0;
1033 		}
1034 		sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1035 	}
1036 	SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1037 	/* free the TCB but first save off the ep */
1038 	(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1039 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1040 }
1041 
1042 static void
1043 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
1044 {
1045 	switch (chunk_type) {
1046 	case SCTP_ASCONF_ACK:
1047 	case SCTP_ASCONF:
1048 		sctp_asconf_cleanup(stcb);
1049 		break;
1050 	case SCTP_IFORWARD_CUM_TSN:
1051 	case SCTP_FORWARD_CUM_TSN:
1052 		stcb->asoc.prsctp_supported = 0;
1053 		break;
1054 	default:
1055 		SCTPDBG(SCTP_DEBUG_INPUT2,
1056 		    "Peer does not support chunk type %d (0x%x).\n",
1057 		    chunk_type, chunk_type);
1058 		break;
1059 	}
1060 }
1061 
1062 /*
1063  * Skip past the param header and then we will find the param that caused the
1064  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1065  * these will turn of specific features.
1066  * XXX: Is this the right thing to do?
1067  */
1068 static void
1069 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1070 {
1071 	switch (parameter_type) {
1072 		/* pr-sctp draft */
1073 	case SCTP_PRSCTP_SUPPORTED:
1074 		stcb->asoc.prsctp_supported = 0;
1075 		break;
1076 	case SCTP_SUPPORTED_CHUNK_EXT:
1077 		break;
1078 		/* draft-ietf-tsvwg-addip-sctp */
1079 	case SCTP_HAS_NAT_SUPPORT:
1080 		stcb->asoc.peer_supports_nat = 0;
1081 		break;
1082 	case SCTP_ADD_IP_ADDRESS:
1083 	case SCTP_DEL_IP_ADDRESS:
1084 	case SCTP_SET_PRIM_ADDR:
1085 		stcb->asoc.asconf_supported = 0;
1086 		break;
1087 	case SCTP_SUCCESS_REPORT:
1088 	case SCTP_ERROR_CAUSE_IND:
1089 		SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1090 		SCTPDBG(SCTP_DEBUG_INPUT2,
1091 		    "Turning off ASCONF to this strange peer\n");
1092 		stcb->asoc.asconf_supported = 0;
1093 		break;
1094 	default:
1095 		SCTPDBG(SCTP_DEBUG_INPUT2,
1096 		    "Peer does not support param type %d (0x%x)??\n",
1097 		    parameter_type, parameter_type);
1098 		break;
1099 	}
1100 }
1101 
1102 static int
1103 sctp_handle_error(struct sctp_chunkhdr *ch,
1104     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1105 {
1106 	struct sctp_error_cause *cause;
1107 	struct sctp_association *asoc;
1108 	uint32_t remaining_length, adjust;
1109 	uint16_t code, cause_code, cause_length;
1110 
1111 	/* parse through all of the errors and process */
1112 	asoc = &stcb->asoc;
1113 	cause = (struct sctp_error_cause *)((caddr_t)ch +
1114 	    sizeof(struct sctp_chunkhdr));
1115 	remaining_length = ntohs(ch->chunk_length);
1116 	if (remaining_length > limit) {
1117 		remaining_length = limit;
1118 	}
1119 	if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1120 		remaining_length -= sizeof(struct sctp_chunkhdr);
1121 	} else {
1122 		remaining_length = 0;
1123 	}
1124 	code = 0;
1125 	while (remaining_length >= sizeof(struct sctp_error_cause)) {
1126 		/* Process an Error Cause */
1127 		cause_code = ntohs(cause->code);
1128 		cause_length = ntohs(cause->length);
1129 		if ((cause_length > remaining_length) || (cause_length == 0)) {
1130 			/* Invalid cause length, possibly due to truncation. */
1131 			SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1132 			    remaining_length, cause_length);
1133 			return (0);
1134 		}
1135 		if (code == 0) {
1136 			/* report the first error cause */
1137 			code = cause_code;
1138 		}
1139 		switch (cause_code) {
1140 		case SCTP_CAUSE_INVALID_STREAM:
1141 		case SCTP_CAUSE_MISSING_PARAM:
1142 		case SCTP_CAUSE_INVALID_PARAM:
1143 		case SCTP_CAUSE_NO_USER_DATA:
1144 			SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1145 			    cause_code);
1146 			break;
1147 		case SCTP_CAUSE_NAT_COLLIDING_STATE:
1148 			SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n",
1149 			    ch->chunk_flags);
1150 			if (sctp_handle_nat_colliding_state(stcb)) {
1151 				return (0);
1152 			}
1153 			break;
1154 		case SCTP_CAUSE_NAT_MISSING_STATE:
1155 			SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n",
1156 			    ch->chunk_flags);
1157 			if (sctp_handle_nat_missing_state(stcb, net)) {
1158 				return (0);
1159 			}
1160 			break;
1161 		case SCTP_CAUSE_STALE_COOKIE:
1162 			/*
1163 			 * We only act if we have echoed a cookie and are
1164 			 * waiting.
1165 			 */
1166 			if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1167 			    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1168 				struct sctp_error_stale_cookie *stale_cookie;
1169 
1170 				stale_cookie = (struct sctp_error_stale_cookie *)cause;
1171 				asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time);
1172 				/* Double it to be more robust on RTX */
1173 				if (asoc->cookie_preserve_req <= UINT32_MAX / 2) {
1174 					asoc->cookie_preserve_req *= 2;
1175 				} else {
1176 					asoc->cookie_preserve_req = UINT32_MAX;
1177 				}
1178 				asoc->stale_cookie_count++;
1179 				if (asoc->stale_cookie_count >
1180 				    asoc->max_init_times) {
1181 					sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1182 					/* now free the asoc */
1183 					(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1184 					    SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1185 					return (-1);
1186 				}
1187 				/* blast back to INIT state */
1188 				sctp_toss_old_cookies(stcb, &stcb->asoc);
1189 				SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1190 				sctp_stop_all_cookie_timers(stcb);
1191 				sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1192 			}
1193 			break;
1194 		case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1195 			/*
1196 			 * Nothing we can do here, we don't do hostname
1197 			 * addresses so if the peer does not like my IPv6
1198 			 * (or IPv4 for that matter) it does not matter. If
1199 			 * they don't support that type of address, they can
1200 			 * NOT possibly get that packet type... i.e. with no
1201 			 * IPv6 you can't receive a IPv6 packet. so we can
1202 			 * safely ignore this one. If we ever added support
1203 			 * for HOSTNAME Addresses, then we would need to do
1204 			 * something here.
1205 			 */
1206 			break;
1207 		case SCTP_CAUSE_UNRECOG_CHUNK:
1208 			if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1209 				struct sctp_error_unrecognized_chunk *unrec_chunk;
1210 
1211 				unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1212 				sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
1213 			}
1214 			break;
1215 		case SCTP_CAUSE_UNRECOG_PARAM:
1216 			/* XXX: We only consider the first parameter */
1217 			if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1218 				struct sctp_paramhdr *unrec_parameter;
1219 
1220 				unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1221 				sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1222 			}
1223 			break;
1224 		case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1225 			/*
1226 			 * We ignore this since the timer will drive out a
1227 			 * new cookie anyway and there timer will drive us
1228 			 * to send a SHUTDOWN_COMPLETE. We can't send one
1229 			 * here since we don't have their tag.
1230 			 */
1231 			break;
1232 		case SCTP_CAUSE_DELETING_LAST_ADDR:
1233 		case SCTP_CAUSE_RESOURCE_SHORTAGE:
1234 		case SCTP_CAUSE_DELETING_SRC_ADDR:
1235 			/*
1236 			 * We should NOT get these here, but in a
1237 			 * ASCONF-ACK.
1238 			 */
1239 			SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1240 			    cause_code);
1241 			break;
1242 		case SCTP_CAUSE_OUT_OF_RESC:
1243 			/*
1244 			 * And what, pray tell do we do with the fact that
1245 			 * the peer is out of resources? Not really sure we
1246 			 * could do anything but abort. I suspect this
1247 			 * should have came WITH an abort instead of in a
1248 			 * OP-ERROR.
1249 			 */
1250 			break;
1251 		default:
1252 			SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1253 			    cause_code);
1254 			break;
1255 		}
1256 		adjust = SCTP_SIZE32(cause_length);
1257 		if (remaining_length >= adjust) {
1258 			remaining_length -= adjust;
1259 		} else {
1260 			remaining_length = 0;
1261 		}
1262 		cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1263 	}
1264 	sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1265 	return (0);
1266 }
1267 
1268 static int
1269 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1270     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1271     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1272     struct sctp_nets *net, int *abort_no_unlock,
1273     uint8_t mflowtype, uint32_t mflowid,
1274     uint32_t vrf_id)
1275 {
1276 	struct sctp_init_ack *init_ack;
1277 	struct mbuf *op_err;
1278 
1279 	SCTPDBG(SCTP_DEBUG_INPUT2,
1280 	    "sctp_handle_init_ack: handling INIT-ACK\n");
1281 
1282 	if (stcb == NULL) {
1283 		SCTPDBG(SCTP_DEBUG_INPUT2,
1284 		    "sctp_handle_init_ack: TCB is null\n");
1285 		return (-1);
1286 	}
1287 	if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1288 		/* Invalid length */
1289 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1290 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1291 		    src, dst, sh, op_err,
1292 		    mflowtype, mflowid,
1293 		    vrf_id, net->port);
1294 		*abort_no_unlock = 1;
1295 		return (-1);
1296 	}
1297 	init_ack = &cp->init;
1298 	/* validate parameters */
1299 	if (init_ack->initiate_tag == 0) {
1300 		/* protocol error... send an abort */
1301 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1302 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1303 		    src, dst, sh, op_err,
1304 		    mflowtype, mflowid,
1305 		    vrf_id, net->port);
1306 		*abort_no_unlock = 1;
1307 		return (-1);
1308 	}
1309 	if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1310 		/* protocol error... send an abort */
1311 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1312 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1313 		    src, dst, sh, op_err,
1314 		    mflowtype, mflowid,
1315 		    vrf_id, net->port);
1316 		*abort_no_unlock = 1;
1317 		return (-1);
1318 	}
1319 	if (init_ack->num_inbound_streams == 0) {
1320 		/* protocol error... send an abort */
1321 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1322 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1323 		    src, dst, sh, op_err,
1324 		    mflowtype, mflowid,
1325 		    vrf_id, net->port);
1326 		*abort_no_unlock = 1;
1327 		return (-1);
1328 	}
1329 	if (init_ack->num_outbound_streams == 0) {
1330 		/* protocol error... send an abort */
1331 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1332 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1333 		    src, dst, sh, op_err,
1334 		    mflowtype, mflowid,
1335 		    vrf_id, net->port);
1336 		*abort_no_unlock = 1;
1337 		return (-1);
1338 	}
1339 	/* process according to association state... */
1340 	switch (SCTP_GET_STATE(stcb)) {
1341 	case SCTP_STATE_COOKIE_WAIT:
1342 		/* this is the expected state for this chunk */
1343 		/* process the INIT-ACK parameters */
1344 		if (stcb->asoc.primary_destination->dest_state &
1345 		    SCTP_ADDR_UNCONFIRMED) {
1346 			/*
1347 			 * The primary is where we sent the INIT, we can
1348 			 * always consider it confirmed when the INIT-ACK is
1349 			 * returned. Do this before we load addresses
1350 			 * though.
1351 			 */
1352 			stcb->asoc.primary_destination->dest_state &=
1353 			    ~SCTP_ADDR_UNCONFIRMED;
1354 			sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1355 			    stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1356 		}
1357 		if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1358 		    net, abort_no_unlock,
1359 		    mflowtype, mflowid,
1360 		    vrf_id) < 0) {
1361 			/* error in parsing parameters */
1362 			return (-1);
1363 		}
1364 		/* update our state */
1365 		SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1366 		SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1367 
1368 		/* reset the RTO calc */
1369 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1370 			sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1371 			    stcb->asoc.overall_error_count,
1372 			    0,
1373 			    SCTP_FROM_SCTP_INPUT,
1374 			    __LINE__);
1375 		}
1376 		stcb->asoc.overall_error_count = 0;
1377 		(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1378 		/*
1379 		 * collapse the init timer back in case of a exponential
1380 		 * backoff
1381 		 */
1382 		sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1383 		    stcb, net);
1384 		/*
1385 		 * the send at the end of the inbound data processing will
1386 		 * cause the cookie to be sent
1387 		 */
1388 		break;
1389 	case SCTP_STATE_SHUTDOWN_SENT:
1390 		/* incorrect state... discard */
1391 		break;
1392 	case SCTP_STATE_COOKIE_ECHOED:
1393 		/* incorrect state... discard */
1394 		break;
1395 	case SCTP_STATE_OPEN:
1396 		/* incorrect state... discard */
1397 		break;
1398 	case SCTP_STATE_EMPTY:
1399 	case SCTP_STATE_INUSE:
1400 	default:
1401 		/* incorrect state... discard */
1402 		return (-1);
1403 		break;
1404 	}
1405 	SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1406 	return (0);
1407 }
1408 
1409 static struct sctp_tcb *
1410 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1411     struct sockaddr *src, struct sockaddr *dst,
1412     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1413     struct sctp_inpcb *inp, struct sctp_nets **netp,
1414     struct sockaddr *init_src, int *notification,
1415     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1416     uint8_t mflowtype, uint32_t mflowid,
1417     uint32_t vrf_id, uint16_t port);
1418 
1419 
1420 /*
1421  * handle a state cookie for an existing association m: input packet mbuf
1422  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1423  * "split" mbuf and the cookie signature does not exist offset: offset into
1424  * mbuf to the cookie-echo chunk
1425  */
1426 static struct sctp_tcb *
1427 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1428     struct sockaddr *src, struct sockaddr *dst,
1429     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1430     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1431     struct sockaddr *init_src, int *notification,
1432     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1433     uint8_t mflowtype, uint32_t mflowid,
1434     uint32_t vrf_id, uint16_t port)
1435 {
1436 	struct sctp_association *asoc;
1437 	struct sctp_init_chunk *init_cp, init_buf;
1438 	struct sctp_init_ack_chunk *initack_cp, initack_buf;
1439 	struct sctp_nets *net;
1440 	struct mbuf *op_err;
1441 	struct timeval old;
1442 	int init_offset, initack_offset, i;
1443 	int retval;
1444 	int spec_flag = 0;
1445 	uint32_t how_indx;
1446 #if defined(SCTP_DETAILED_STR_STATS)
1447 	int j;
1448 #endif
1449 
1450 	net = *netp;
1451 	/* I know that the TCB is non-NULL from the caller */
1452 	asoc = &stcb->asoc;
1453 	for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1454 		if (asoc->cookie_how[how_indx] == 0)
1455 			break;
1456 	}
1457 	if (how_indx < sizeof(asoc->cookie_how)) {
1458 		asoc->cookie_how[how_indx] = 1;
1459 	}
1460 	if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1461 		/* SHUTDOWN came in after sending INIT-ACK */
1462 		sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1463 		op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1464 		sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1465 		    mflowtype, mflowid, inp->fibnum,
1466 		    vrf_id, net->port);
1467 		if (how_indx < sizeof(asoc->cookie_how))
1468 			asoc->cookie_how[how_indx] = 2;
1469 		return (NULL);
1470 	}
1471 	/*
1472 	 * find and validate the INIT chunk in the cookie (peer's info) the
1473 	 * INIT should start after the cookie-echo header struct (chunk
1474 	 * header, state cookie header struct)
1475 	 */
1476 	init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1477 
1478 	init_cp = (struct sctp_init_chunk *)
1479 	    sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1480 	    (uint8_t *)&init_buf);
1481 	if (init_cp == NULL) {
1482 		/* could not pull a INIT chunk in cookie */
1483 		return (NULL);
1484 	}
1485 	if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1486 		return (NULL);
1487 	}
1488 	/*
1489 	 * find and validate the INIT-ACK chunk in the cookie (my info) the
1490 	 * INIT-ACK follows the INIT chunk
1491 	 */
1492 	initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1493 	initack_cp = (struct sctp_init_ack_chunk *)
1494 	    sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1495 	    (uint8_t *)&initack_buf);
1496 	if (initack_cp == NULL) {
1497 		/* could not pull INIT-ACK chunk in cookie */
1498 		return (NULL);
1499 	}
1500 	if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1501 		return (NULL);
1502 	}
1503 	if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1504 	    (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1505 		/*
1506 		 * case D in Section 5.2.4 Table 2: MMAA process accordingly
1507 		 * to get into the OPEN state
1508 		 */
1509 		if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1510 			/*-
1511 			 * Opps, this means that we somehow generated two vtag's
1512 			 * the same. I.e. we did:
1513 			 *  Us               Peer
1514 			 *   <---INIT(tag=a)------
1515 			 *   ----INIT-ACK(tag=t)-->
1516 			 *   ----INIT(tag=t)------> *1
1517 			 *   <---INIT-ACK(tag=a)---
1518                          *   <----CE(tag=t)------------- *2
1519 			 *
1520 			 * At point *1 we should be generating a different
1521 			 * tag t'. Which means we would throw away the CE and send
1522 			 * ours instead. Basically this is case C (throw away side).
1523 			 */
1524 			if (how_indx < sizeof(asoc->cookie_how))
1525 				asoc->cookie_how[how_indx] = 17;
1526 			return (NULL);
1527 
1528 		}
1529 		switch (SCTP_GET_STATE(stcb)) {
1530 		case SCTP_STATE_COOKIE_WAIT:
1531 		case SCTP_STATE_COOKIE_ECHOED:
1532 			/*
1533 			 * INIT was sent but got a COOKIE_ECHO with the
1534 			 * correct tags... just accept it...but we must
1535 			 * process the init so that we can make sure we have
1536 			 * the right seq no's.
1537 			 */
1538 			/* First we must process the INIT !! */
1539 			retval = sctp_process_init(init_cp, stcb);
1540 			if (retval < 0) {
1541 				if (how_indx < sizeof(asoc->cookie_how))
1542 					asoc->cookie_how[how_indx] = 3;
1543 				return (NULL);
1544 			}
1545 			/* we have already processed the INIT so no problem */
1546 			sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1547 			    stcb, net,
1548 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1549 			sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1550 			    stcb, net,
1551 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1552 			/* update current state */
1553 			if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1554 				SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1555 			else
1556 				SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1557 
1558 			SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1559 			if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1560 				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1561 				    stcb->sctp_ep, stcb, NULL);
1562 			}
1563 			SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1564 			sctp_stop_all_cookie_timers(stcb);
1565 			if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1566 			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1567 			    (!SCTP_IS_LISTENING(inp))) {
1568 				/*
1569 				 * Here is where collision would go if we
1570 				 * did a connect() and instead got a
1571 				 * init/init-ack/cookie done before the
1572 				 * init-ack came back..
1573 				 */
1574 				stcb->sctp_ep->sctp_flags |=
1575 				    SCTP_PCB_FLAGS_CONNECTED;
1576 				soisconnected(stcb->sctp_socket);
1577 			}
1578 			/* notify upper layer */
1579 			*notification = SCTP_NOTIFY_ASSOC_UP;
1580 			/*
1581 			 * since we did not send a HB make sure we don't
1582 			 * double things
1583 			 */
1584 			old.tv_sec = cookie->time_entered.tv_sec;
1585 			old.tv_usec = cookie->time_entered.tv_usec;
1586 			net->hb_responded = 1;
1587 			sctp_calculate_rto(stcb, asoc, net, &old,
1588 			    SCTP_RTT_FROM_NON_DATA);
1589 
1590 			if (stcb->asoc.sctp_autoclose_ticks &&
1591 			    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1592 				sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1593 				    inp, stcb, NULL);
1594 			}
1595 			break;
1596 		default:
1597 			/*
1598 			 * we're in the OPEN state (or beyond), so peer must
1599 			 * have simply lost the COOKIE-ACK
1600 			 */
1601 			break;
1602 		}		/* end switch */
1603 		sctp_stop_all_cookie_timers(stcb);
1604 		/*
1605 		 * We ignore the return code here.. not sure if we should
1606 		 * somehow abort.. but we do have an existing asoc. This
1607 		 * really should not fail.
1608 		 */
1609 		if (sctp_load_addresses_from_init(stcb, m,
1610 		    init_offset + sizeof(struct sctp_init_chunk),
1611 		    initack_offset, src, dst, init_src, stcb->asoc.port)) {
1612 			if (how_indx < sizeof(asoc->cookie_how))
1613 				asoc->cookie_how[how_indx] = 4;
1614 			return (NULL);
1615 		}
1616 		/* respond with a COOKIE-ACK */
1617 		sctp_toss_old_cookies(stcb, asoc);
1618 		sctp_send_cookie_ack(stcb);
1619 		if (how_indx < sizeof(asoc->cookie_how))
1620 			asoc->cookie_how[how_indx] = 5;
1621 		return (stcb);
1622 	}
1623 
1624 	if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1625 	    ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1626 	    cookie->tie_tag_my_vtag == 0 &&
1627 	    cookie->tie_tag_peer_vtag == 0) {
1628 		/*
1629 		 * case C in Section 5.2.4 Table 2: XMOO silently discard
1630 		 */
1631 		if (how_indx < sizeof(asoc->cookie_how))
1632 			asoc->cookie_how[how_indx] = 6;
1633 		return (NULL);
1634 	}
1635 	/*
1636 	 * If nat support, and the below and stcb is established, send back
1637 	 * a ABORT(colliding state) if we are established.
1638 	 */
1639 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1640 	    (asoc->peer_supports_nat) &&
1641 	    ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1642 	    ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1643 	    (asoc->peer_vtag == 0)))) {
1644 		/*
1645 		 * Special case - Peer's support nat. We may have two init's
1646 		 * that we gave out the same tag on since one was not
1647 		 * established.. i.e. we get INIT from host-1 behind the nat
1648 		 * and we respond tag-a, we get a INIT from host-2 behind
1649 		 * the nat and we get tag-a again. Then we bring up host-1
1650 		 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1651 		 * Now we have colliding state. We must send an abort here
1652 		 * with colliding state indication.
1653 		 */
1654 		op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1655 		sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1656 		    mflowtype, mflowid, inp->fibnum,
1657 		    vrf_id, port);
1658 		return (NULL);
1659 	}
1660 	if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1661 	    ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1662 	    (asoc->peer_vtag == 0))) {
1663 		/*
1664 		 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1665 		 * should be ok, re-accept peer info
1666 		 */
1667 		if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1668 			/*
1669 			 * Extension of case C. If we hit this, then the
1670 			 * random number generator returned the same vtag
1671 			 * when we first sent our INIT-ACK and when we later
1672 			 * sent our INIT. The side with the seq numbers that
1673 			 * are different will be the one that normnally
1674 			 * would have hit case C. This in effect "extends"
1675 			 * our vtags in this collision case to be 64 bits.
1676 			 * The same collision could occur aka you get both
1677 			 * vtag and seq number the same twice in a row.. but
1678 			 * is much less likely. If it did happen then we
1679 			 * would proceed through and bring up the assoc.. we
1680 			 * may end up with the wrong stream setup however..
1681 			 * which would be bad.. but there is no way to
1682 			 * tell.. until we send on a stream that does not
1683 			 * exist :-)
1684 			 */
1685 			if (how_indx < sizeof(asoc->cookie_how))
1686 				asoc->cookie_how[how_indx] = 7;
1687 
1688 			return (NULL);
1689 		}
1690 		if (how_indx < sizeof(asoc->cookie_how))
1691 			asoc->cookie_how[how_indx] = 8;
1692 		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1693 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1694 		sctp_stop_all_cookie_timers(stcb);
1695 		/*
1696 		 * since we did not send a HB make sure we don't double
1697 		 * things
1698 		 */
1699 		net->hb_responded = 1;
1700 		if (stcb->asoc.sctp_autoclose_ticks &&
1701 		    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1702 			sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1703 			    NULL);
1704 		}
1705 		asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1706 		asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1707 
1708 		if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1709 			/*
1710 			 * Ok the peer probably discarded our data (if we
1711 			 * echoed a cookie+data). So anything on the
1712 			 * sent_queue should be marked for retransmit, we
1713 			 * may not get something to kick us so it COULD
1714 			 * still take a timeout to move these.. but it can't
1715 			 * hurt to mark them.
1716 			 */
1717 			struct sctp_tmit_chunk *chk;
1718 
1719 			TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1720 				if (chk->sent < SCTP_DATAGRAM_RESEND) {
1721 					chk->sent = SCTP_DATAGRAM_RESEND;
1722 					sctp_flight_size_decrease(chk);
1723 					sctp_total_flight_decrease(stcb, chk);
1724 					sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1725 					spec_flag++;
1726 				}
1727 			}
1728 
1729 		}
1730 		/* process the INIT info (peer's info) */
1731 		retval = sctp_process_init(init_cp, stcb);
1732 		if (retval < 0) {
1733 			if (how_indx < sizeof(asoc->cookie_how))
1734 				asoc->cookie_how[how_indx] = 9;
1735 			return (NULL);
1736 		}
1737 		if (sctp_load_addresses_from_init(stcb, m,
1738 		    init_offset + sizeof(struct sctp_init_chunk),
1739 		    initack_offset, src, dst, init_src, stcb->asoc.port)) {
1740 			if (how_indx < sizeof(asoc->cookie_how))
1741 				asoc->cookie_how[how_indx] = 10;
1742 			return (NULL);
1743 		}
1744 		if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1745 		    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1746 			*notification = SCTP_NOTIFY_ASSOC_UP;
1747 
1748 			if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1749 			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1750 			    (!SCTP_IS_LISTENING(inp))) {
1751 				stcb->sctp_ep->sctp_flags |=
1752 				    SCTP_PCB_FLAGS_CONNECTED;
1753 				soisconnected(stcb->sctp_socket);
1754 			}
1755 			if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1756 				SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1757 			else
1758 				SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1759 			SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1760 		} else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1761 			SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1762 		} else {
1763 			SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1764 		}
1765 		SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1766 		if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1767 			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1768 			    stcb->sctp_ep, stcb, NULL);
1769 		}
1770 		sctp_stop_all_cookie_timers(stcb);
1771 		sctp_toss_old_cookies(stcb, asoc);
1772 		sctp_send_cookie_ack(stcb);
1773 		if (spec_flag) {
1774 			/*
1775 			 * only if we have retrans set do we do this. What
1776 			 * this call does is get only the COOKIE-ACK out and
1777 			 * then when we return the normal call to
1778 			 * sctp_chunk_output will get the retrans out behind
1779 			 * this.
1780 			 */
1781 			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1782 		}
1783 		if (how_indx < sizeof(asoc->cookie_how))
1784 			asoc->cookie_how[how_indx] = 11;
1785 
1786 		return (stcb);
1787 	}
1788 	if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1789 	    ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1790 	    cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1791 	    cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1792 	    cookie->tie_tag_peer_vtag != 0) {
1793 		struct sctpasochead *head;
1794 
1795 		if (asoc->peer_supports_nat) {
1796 			/*
1797 			 * This is a gross gross hack. Just call the
1798 			 * cookie_new code since we are allowing a duplicate
1799 			 * association. I hope this works...
1800 			 */
1801 			return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1802 			    sh, cookie, cookie_len,
1803 			    inp, netp, init_src, notification,
1804 			    auth_skipped, auth_offset, auth_len,
1805 			    mflowtype, mflowid,
1806 			    vrf_id, port));
1807 		}
1808 		/*
1809 		 * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1810 		 */
1811 		/* temp code */
1812 		if (how_indx < sizeof(asoc->cookie_how))
1813 			asoc->cookie_how[how_indx] = 12;
1814 		sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1815 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1816 		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1817 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1818 
1819 		/* notify upper layer */
1820 		*notification = SCTP_NOTIFY_ASSOC_RESTART;
1821 		atomic_add_int(&stcb->asoc.refcnt, 1);
1822 		if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1823 		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1824 		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1825 			SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1826 		}
1827 		if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1828 			SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1829 		} else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1830 			SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1831 		}
1832 		if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1833 			SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1834 			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1835 			    stcb->sctp_ep, stcb, NULL);
1836 
1837 		} else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1838 			/* move to OPEN state, if not in SHUTDOWN_SENT */
1839 			SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1840 		}
1841 		asoc->pre_open_streams =
1842 		    ntohs(initack_cp->init.num_outbound_streams);
1843 		asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1844 		asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1845 		asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1846 
1847 		asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1848 
1849 		asoc->str_reset_seq_in = asoc->init_seq_number;
1850 
1851 		asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1852 		if (asoc->mapping_array) {
1853 			memset(asoc->mapping_array, 0,
1854 			    asoc->mapping_array_size);
1855 		}
1856 		if (asoc->nr_mapping_array) {
1857 			memset(asoc->nr_mapping_array, 0,
1858 			    asoc->mapping_array_size);
1859 		}
1860 		SCTP_TCB_UNLOCK(stcb);
1861 		SCTP_INP_INFO_WLOCK();
1862 		SCTP_INP_WLOCK(stcb->sctp_ep);
1863 		SCTP_TCB_LOCK(stcb);
1864 		atomic_add_int(&stcb->asoc.refcnt, -1);
1865 		/* send up all the data */
1866 		SCTP_TCB_SEND_LOCK(stcb);
1867 
1868 		sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
1869 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1870 			stcb->asoc.strmout[i].chunks_on_queues = 0;
1871 #if defined(SCTP_DETAILED_STR_STATS)
1872 			for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1873 				asoc->strmout[i].abandoned_sent[j] = 0;
1874 				asoc->strmout[i].abandoned_unsent[j] = 0;
1875 			}
1876 #else
1877 			asoc->strmout[i].abandoned_sent[0] = 0;
1878 			asoc->strmout[i].abandoned_unsent[0] = 0;
1879 #endif
1880 			stcb->asoc.strmout[i].sid = i;
1881 			stcb->asoc.strmout[i].next_mid_ordered = 0;
1882 			stcb->asoc.strmout[i].next_mid_unordered = 0;
1883 			stcb->asoc.strmout[i].last_msg_incomplete = 0;
1884 		}
1885 		/* process the INIT-ACK info (my info) */
1886 		asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1887 		asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1888 
1889 		/* pull from vtag hash */
1890 		LIST_REMOVE(stcb, sctp_asocs);
1891 		/* re-insert to new vtag position */
1892 		head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1893 		    SCTP_BASE_INFO(hashasocmark))];
1894 		/*
1895 		 * put it in the bucket in the vtag hash of assoc's for the
1896 		 * system
1897 		 */
1898 		LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1899 
1900 		SCTP_TCB_SEND_UNLOCK(stcb);
1901 		SCTP_INP_WUNLOCK(stcb->sctp_ep);
1902 		SCTP_INP_INFO_WUNLOCK();
1903 		asoc->total_flight = 0;
1904 		asoc->total_flight_count = 0;
1905 		/* process the INIT info (peer's info) */
1906 		retval = sctp_process_init(init_cp, stcb);
1907 		if (retval < 0) {
1908 			if (how_indx < sizeof(asoc->cookie_how))
1909 				asoc->cookie_how[how_indx] = 13;
1910 
1911 			return (NULL);
1912 		}
1913 		/*
1914 		 * since we did not send a HB make sure we don't double
1915 		 * things
1916 		 */
1917 		net->hb_responded = 1;
1918 
1919 		if (sctp_load_addresses_from_init(stcb, m,
1920 		    init_offset + sizeof(struct sctp_init_chunk),
1921 		    initack_offset, src, dst, init_src, stcb->asoc.port)) {
1922 			if (how_indx < sizeof(asoc->cookie_how))
1923 				asoc->cookie_how[how_indx] = 14;
1924 
1925 			return (NULL);
1926 		}
1927 		/* respond with a COOKIE-ACK */
1928 		sctp_stop_all_cookie_timers(stcb);
1929 		sctp_toss_old_cookies(stcb, asoc);
1930 		sctp_send_cookie_ack(stcb);
1931 		if (how_indx < sizeof(asoc->cookie_how))
1932 			asoc->cookie_how[how_indx] = 15;
1933 
1934 		return (stcb);
1935 	}
1936 	if (how_indx < sizeof(asoc->cookie_how))
1937 		asoc->cookie_how[how_indx] = 16;
1938 	/* all other cases... */
1939 	return (NULL);
1940 }
1941 
1942 
1943 /*
1944  * handle a state cookie for a new association m: input packet mbuf chain--
1945  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1946  * and the cookie signature does not exist offset: offset into mbuf to the
1947  * cookie-echo chunk length: length of the cookie chunk to: where the init
1948  * was from returns a new TCB
1949  */
1950 static struct sctp_tcb *
1951 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1952     struct sockaddr *src, struct sockaddr *dst,
1953     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1954     struct sctp_inpcb *inp, struct sctp_nets **netp,
1955     struct sockaddr *init_src, int *notification,
1956     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1957     uint8_t mflowtype, uint32_t mflowid,
1958     uint32_t vrf_id, uint16_t port)
1959 {
1960 	struct sctp_tcb *stcb;
1961 	struct sctp_init_chunk *init_cp, init_buf;
1962 	struct sctp_init_ack_chunk *initack_cp, initack_buf;
1963 	union sctp_sockstore store;
1964 	struct sctp_association *asoc;
1965 	int init_offset, initack_offset, initack_limit;
1966 	int retval;
1967 	int error = 0;
1968 	uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
1969 
1970 	/*
1971 	 * find and validate the INIT chunk in the cookie (peer's info) the
1972 	 * INIT should start after the cookie-echo header struct (chunk
1973 	 * header, state cookie header struct)
1974 	 */
1975 	init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1976 	init_cp = (struct sctp_init_chunk *)
1977 	    sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1978 	    (uint8_t *)&init_buf);
1979 	if (init_cp == NULL) {
1980 		/* could not pull a INIT chunk in cookie */
1981 		SCTPDBG(SCTP_DEBUG_INPUT1,
1982 		    "process_cookie_new: could not pull INIT chunk hdr\n");
1983 		return (NULL);
1984 	}
1985 	if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1986 		SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
1987 		return (NULL);
1988 	}
1989 	initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1990 	/*
1991 	 * find and validate the INIT-ACK chunk in the cookie (my info) the
1992 	 * INIT-ACK follows the INIT chunk
1993 	 */
1994 	initack_cp = (struct sctp_init_ack_chunk *)
1995 	    sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1996 	    (uint8_t *)&initack_buf);
1997 	if (initack_cp == NULL) {
1998 		/* could not pull INIT-ACK chunk in cookie */
1999 		SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2000 		return (NULL);
2001 	}
2002 	if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2003 		return (NULL);
2004 	}
2005 	/*
2006 	 * NOTE: We can't use the INIT_ACK's chk_length to determine the
2007 	 * "initack_limit" value.  This is because the chk_length field
2008 	 * includes the length of the cookie, but the cookie is omitted when
2009 	 * the INIT and INIT_ACK are tacked onto the cookie...
2010 	 */
2011 	initack_limit = offset + cookie_len;
2012 
2013 	/*
2014 	 * now that we know the INIT/INIT-ACK are in place, create a new TCB
2015 	 * and popluate
2016 	 */
2017 
2018 	/*
2019 	 * Here we do a trick, we set in NULL for the proc/thread argument.
2020 	 * We do this since in effect we only use the p argument when the
2021 	 * socket is unbound and we must do an implicit bind. Since we are
2022 	 * getting a cookie, we cannot be unbound.
2023 	 */
2024 	stcb = sctp_aloc_assoc(inp, init_src, &error,
2025 	    ntohl(initack_cp->init.initiate_tag), vrf_id,
2026 	    ntohs(initack_cp->init.num_outbound_streams),
2027 	    port,
2028 	    (struct thread *)NULL,
2029 	    SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2030 	if (stcb == NULL) {
2031 		struct mbuf *op_err;
2032 
2033 		/* memory problem? */
2034 		SCTPDBG(SCTP_DEBUG_INPUT1,
2035 		    "process_cookie_new: no room for another TCB!\n");
2036 		op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2037 		sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2038 		    src, dst, sh, op_err,
2039 		    mflowtype, mflowid,
2040 		    vrf_id, port);
2041 		return (NULL);
2042 	}
2043 	/* get the correct sctp_nets */
2044 	if (netp)
2045 		*netp = sctp_findnet(stcb, init_src);
2046 
2047 	asoc = &stcb->asoc;
2048 	/* get scope variables out of cookie */
2049 	asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2050 	asoc->scope.site_scope = cookie->site_scope;
2051 	asoc->scope.local_scope = cookie->local_scope;
2052 	asoc->scope.loopback_scope = cookie->loopback_scope;
2053 
2054 	if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2055 	    (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2056 		struct mbuf *op_err;
2057 
2058 		/*
2059 		 * Houston we have a problem. The EP changed while the
2060 		 * cookie was in flight. Only recourse is to abort the
2061 		 * association.
2062 		 */
2063 		op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2064 		sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2065 		    src, dst, sh, op_err,
2066 		    mflowtype, mflowid,
2067 		    vrf_id, port);
2068 		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2069 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2070 		return (NULL);
2071 	}
2072 	/* process the INIT-ACK info (my info) */
2073 	asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2074 	asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2075 	asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2076 	asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2077 	asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2078 	asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2079 	asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2080 	asoc->str_reset_seq_in = asoc->init_seq_number;
2081 
2082 	asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2083 
2084 	/* process the INIT info (peer's info) */
2085 	if (netp)
2086 		retval = sctp_process_init(init_cp, stcb);
2087 	else
2088 		retval = 0;
2089 	if (retval < 0) {
2090 		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2091 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2092 		return (NULL);
2093 	}
2094 	/* load all addresses */
2095 	if (sctp_load_addresses_from_init(stcb, m,
2096 	    init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2097 	    src, dst, init_src, port)) {
2098 		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2099 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2100 		return (NULL);
2101 	}
2102 	/*
2103 	 * verify any preceding AUTH chunk that was skipped
2104 	 */
2105 	/* pull the local authentication parameters from the cookie/init-ack */
2106 	sctp_auth_get_cookie_params(stcb, m,
2107 	    initack_offset + sizeof(struct sctp_init_ack_chunk),
2108 	    initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2109 	if (auth_skipped) {
2110 		struct sctp_auth_chunk *auth;
2111 
2112 		if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
2113 			auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2114 		} else {
2115 			auth = NULL;
2116 		}
2117 		if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2118 			/* auth HMAC failed, dump the assoc and packet */
2119 			SCTPDBG(SCTP_DEBUG_AUTH1,
2120 			    "COOKIE-ECHO: AUTH failed\n");
2121 			(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2122 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2123 			return (NULL);
2124 		} else {
2125 			/* remaining chunks checked... good to go */
2126 			stcb->asoc.authenticated = 1;
2127 		}
2128 	}
2129 
2130 	/*
2131 	 * if we're doing ASCONFs, check to see if we have any new local
2132 	 * addresses that need to get added to the peer (eg. addresses
2133 	 * changed while cookie echo in flight).  This needs to be done
2134 	 * after we go to the OPEN state to do the correct asconf
2135 	 * processing. else, make sure we have the correct addresses in our
2136 	 * lists
2137 	 */
2138 
2139 	/* warning, we re-use sin, sin6, sa_store here! */
2140 	/* pull in local_address (our "from" address) */
2141 	switch (cookie->laddr_type) {
2142 #ifdef INET
2143 	case SCTP_IPV4_ADDRESS:
2144 		/* source addr is IPv4 */
2145 		memset(&store.sin, 0, sizeof(struct sockaddr_in));
2146 		store.sin.sin_family = AF_INET;
2147 		store.sin.sin_len = sizeof(struct sockaddr_in);
2148 		store.sin.sin_addr.s_addr = cookie->laddress[0];
2149 		break;
2150 #endif
2151 #ifdef INET6
2152 	case SCTP_IPV6_ADDRESS:
2153 		/* source addr is IPv6 */
2154 		memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2155 		store.sin6.sin6_family = AF_INET6;
2156 		store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2157 		store.sin6.sin6_scope_id = cookie->scope_id;
2158 		memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2159 		break;
2160 #endif
2161 	default:
2162 		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2163 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2164 		return (NULL);
2165 	}
2166 
2167 	/* update current state */
2168 	SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2169 	SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2170 	if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2171 		sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2172 		    stcb->sctp_ep, stcb, NULL);
2173 	}
2174 	sctp_stop_all_cookie_timers(stcb);
2175 	SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2176 	SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2177 
2178 	/* set up to notify upper layer */
2179 	*notification = SCTP_NOTIFY_ASSOC_UP;
2180 	if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2181 	    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2182 	    (!SCTP_IS_LISTENING(inp))) {
2183 		/*
2184 		 * This is an endpoint that called connect() how it got a
2185 		 * cookie that is NEW is a bit of a mystery. It must be that
2186 		 * the INIT was sent, but before it got there.. a complete
2187 		 * INIT/INIT-ACK/COOKIE arrived. But of course then it
2188 		 * should have went to the other code.. not here.. oh well..
2189 		 * a bit of protection is worth having..
2190 		 */
2191 		stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2192 		soisconnected(stcb->sctp_socket);
2193 	} else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2194 	    (SCTP_IS_LISTENING(inp))) {
2195 		/*
2196 		 * We don't want to do anything with this one. Since it is
2197 		 * the listening guy. The timer will get started for
2198 		 * accepted connections in the caller.
2199 		 */
2200 		;
2201 	}
2202 	/* since we did not send a HB make sure we don't double things */
2203 	if ((netp) && (*netp))
2204 		(*netp)->hb_responded = 1;
2205 
2206 	if (stcb->asoc.sctp_autoclose_ticks &&
2207 	    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2208 		sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2209 	}
2210 	(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2211 	if ((netp != NULL) && (*netp != NULL)) {
2212 		struct timeval old;
2213 
2214 		/* calculate the RTT and set the encaps port */
2215 		old.tv_sec = cookie->time_entered.tv_sec;
2216 		old.tv_usec = cookie->time_entered.tv_usec;
2217 		sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
2218 	}
2219 	/* respond with a COOKIE-ACK */
2220 	sctp_send_cookie_ack(stcb);
2221 
2222 	/*
2223 	 * check the address lists for any ASCONFs that need to be sent
2224 	 * AFTER the cookie-ack is sent
2225 	 */
2226 	sctp_check_address_list(stcb, m,
2227 	    initack_offset + sizeof(struct sctp_init_ack_chunk),
2228 	    initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2229 	    &store.sa, cookie->local_scope, cookie->site_scope,
2230 	    cookie->ipv4_scope, cookie->loopback_scope);
2231 
2232 
2233 	return (stcb);
2234 }
2235 
2236 /*
2237  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2238  * we NEED to make sure we are not already using the vtag. If so we
2239  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2240 	head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2241 							    SCTP_BASE_INFO(hashasocmark))];
2242 	LIST_FOREACH(stcb, head, sctp_asocs) {
2243 	        if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2244 		       -- SEND ABORT - TRY AGAIN --
2245 		}
2246 	}
2247 */
2248 
2249 /*
2250  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2251  * existing (non-NULL) TCB
2252  */
2253 static struct mbuf *
2254 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2255     struct sockaddr *src, struct sockaddr *dst,
2256     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2257     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2258     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2259     struct sctp_tcb **locked_tcb,
2260     uint8_t mflowtype, uint32_t mflowid,
2261     uint32_t vrf_id, uint16_t port)
2262 {
2263 	struct sctp_state_cookie *cookie;
2264 	struct sctp_tcb *l_stcb = *stcb;
2265 	struct sctp_inpcb *l_inp;
2266 	struct sockaddr *to;
2267 	struct sctp_pcb *ep;
2268 	struct mbuf *m_sig;
2269 	uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2270 	uint8_t *sig;
2271 	uint8_t cookie_ok = 0;
2272 	unsigned int sig_offset, cookie_offset;
2273 	unsigned int cookie_len;
2274 	struct timeval now;
2275 	struct timeval time_expires;
2276 	int notification = 0;
2277 	struct sctp_nets *netl;
2278 	int had_a_existing_tcb = 0;
2279 	int send_int_conf = 0;
2280 #ifdef INET
2281 	struct sockaddr_in sin;
2282 #endif
2283 #ifdef INET6
2284 	struct sockaddr_in6 sin6;
2285 #endif
2286 
2287 	SCTPDBG(SCTP_DEBUG_INPUT2,
2288 	    "sctp_handle_cookie: handling COOKIE-ECHO\n");
2289 
2290 	if (inp_p == NULL) {
2291 		return (NULL);
2292 	}
2293 	cookie = &cp->cookie;
2294 	cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2295 	cookie_len = ntohs(cp->ch.chunk_length);
2296 
2297 	if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2298 	    sizeof(struct sctp_init_chunk) +
2299 	    sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2300 		/* cookie too small */
2301 		return (NULL);
2302 	}
2303 	if ((cookie->peerport != sh->src_port) ||
2304 	    (cookie->myport != sh->dest_port) ||
2305 	    (cookie->my_vtag != sh->v_tag)) {
2306 		/*
2307 		 * invalid ports or bad tag.  Note that we always leave the
2308 		 * v_tag in the header in network order and when we stored
2309 		 * it in the my_vtag slot we also left it in network order.
2310 		 * This maintains the match even though it may be in the
2311 		 * opposite byte order of the machine :->
2312 		 */
2313 		return (NULL);
2314 	}
2315 	/*
2316 	 * split off the signature into its own mbuf (since it should not be
2317 	 * calculated in the sctp_hmac_m() call).
2318 	 */
2319 	sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2320 	m_sig = m_split(m, sig_offset, M_NOWAIT);
2321 	if (m_sig == NULL) {
2322 		/* out of memory or ?? */
2323 		return (NULL);
2324 	}
2325 #ifdef SCTP_MBUF_LOGGING
2326 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2327 		sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2328 	}
2329 #endif
2330 
2331 	/*
2332 	 * compute the signature/digest for the cookie
2333 	 */
2334 	ep = &(*inp_p)->sctp_ep;
2335 	l_inp = *inp_p;
2336 	if (l_stcb) {
2337 		SCTP_TCB_UNLOCK(l_stcb);
2338 	}
2339 	SCTP_INP_RLOCK(l_inp);
2340 	if (l_stcb) {
2341 		SCTP_TCB_LOCK(l_stcb);
2342 	}
2343 	/* which cookie is it? */
2344 	if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2345 	    (ep->current_secret_number != ep->last_secret_number)) {
2346 		/* it's the old cookie */
2347 		(void)sctp_hmac_m(SCTP_HMAC,
2348 		    (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2349 		    SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2350 	} else {
2351 		/* it's the current cookie */
2352 		(void)sctp_hmac_m(SCTP_HMAC,
2353 		    (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2354 		    SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2355 	}
2356 	/* get the signature */
2357 	SCTP_INP_RUNLOCK(l_inp);
2358 	sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2359 	if (sig == NULL) {
2360 		/* couldn't find signature */
2361 		sctp_m_freem(m_sig);
2362 		return (NULL);
2363 	}
2364 	/* compare the received digest with the computed digest */
2365 	if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2366 		/* try the old cookie? */
2367 		if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2368 		    (ep->current_secret_number != ep->last_secret_number)) {
2369 			/* compute digest with old */
2370 			(void)sctp_hmac_m(SCTP_HMAC,
2371 			    (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2372 			    SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2373 			/* compare */
2374 			if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2375 				cookie_ok = 1;
2376 		}
2377 	} else {
2378 		cookie_ok = 1;
2379 	}
2380 
2381 	/*
2382 	 * Now before we continue we must reconstruct our mbuf so that
2383 	 * normal processing of any other chunks will work.
2384 	 */
2385 	{
2386 		struct mbuf *m_at;
2387 
2388 		m_at = m;
2389 		while (SCTP_BUF_NEXT(m_at) != NULL) {
2390 			m_at = SCTP_BUF_NEXT(m_at);
2391 		}
2392 		SCTP_BUF_NEXT(m_at) = m_sig;
2393 	}
2394 
2395 	if (cookie_ok == 0) {
2396 		SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2397 		SCTPDBG(SCTP_DEBUG_INPUT2,
2398 		    "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2399 		    (uint32_t)offset, cookie_offset, sig_offset);
2400 		return (NULL);
2401 	}
2402 
2403 	/*
2404 	 * check the cookie timestamps to be sure it's not stale
2405 	 */
2406 	(void)SCTP_GETTIME_TIMEVAL(&now);
2407 	/* Expire time is in Ticks, so we convert to seconds */
2408 	time_expires.tv_sec = cookie->time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
2409 	time_expires.tv_usec = cookie->time_entered.tv_usec;
2410 	if (timevalcmp(&now, &time_expires, >)) {
2411 		/* cookie is stale! */
2412 		struct mbuf *op_err;
2413 		struct sctp_error_stale_cookie *cause;
2414 		struct timeval diff;
2415 		uint32_t staleness;
2416 
2417 		op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2418 		    0, M_NOWAIT, 1, MT_DATA);
2419 		if (op_err == NULL) {
2420 			/* FOOBAR */
2421 			return (NULL);
2422 		}
2423 		/* Set the len */
2424 		SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2425 		cause = mtod(op_err, struct sctp_error_stale_cookie *);
2426 		cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2427 		cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2428 		    (sizeof(uint32_t))));
2429 		diff = now;
2430 		timevalsub(&diff, &time_expires);
2431 		if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2432 			staleness = UINT32_MAX;
2433 		} else {
2434 			staleness = diff.tv_sec * 1000000;
2435 		}
2436 		if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2437 			staleness += diff.tv_usec;
2438 		} else {
2439 			staleness = UINT32_MAX;
2440 		}
2441 		cause->stale_time = htonl(staleness);
2442 		sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2443 		    mflowtype, mflowid, l_inp->fibnum,
2444 		    vrf_id, port);
2445 		return (NULL);
2446 	}
2447 	/*
2448 	 * Now we must see with the lookup address if we have an existing
2449 	 * asoc. This will only happen if we were in the COOKIE-WAIT state
2450 	 * and a INIT collided with us and somewhere the peer sent the
2451 	 * cookie on another address besides the single address our assoc
2452 	 * had for him. In this case we will have one of the tie-tags set at
2453 	 * least AND the address field in the cookie can be used to look it
2454 	 * up.
2455 	 */
2456 	to = NULL;
2457 	switch (cookie->addr_type) {
2458 #ifdef INET6
2459 	case SCTP_IPV6_ADDRESS:
2460 		memset(&sin6, 0, sizeof(sin6));
2461 		sin6.sin6_family = AF_INET6;
2462 		sin6.sin6_len = sizeof(sin6);
2463 		sin6.sin6_port = sh->src_port;
2464 		sin6.sin6_scope_id = cookie->scope_id;
2465 		memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2466 		    sizeof(sin6.sin6_addr.s6_addr));
2467 		to = (struct sockaddr *)&sin6;
2468 		break;
2469 #endif
2470 #ifdef INET
2471 	case SCTP_IPV4_ADDRESS:
2472 		memset(&sin, 0, sizeof(sin));
2473 		sin.sin_family = AF_INET;
2474 		sin.sin_len = sizeof(sin);
2475 		sin.sin_port = sh->src_port;
2476 		sin.sin_addr.s_addr = cookie->address[0];
2477 		to = (struct sockaddr *)&sin;
2478 		break;
2479 #endif
2480 	default:
2481 		/* This should not happen */
2482 		return (NULL);
2483 	}
2484 	if (*stcb == NULL) {
2485 		/* Yep, lets check */
2486 		*stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2487 		if (*stcb == NULL) {
2488 			/*
2489 			 * We should have only got back the same inp. If we
2490 			 * got back a different ep we have a problem. The
2491 			 * original findep got back l_inp and now
2492 			 */
2493 			if (l_inp != *inp_p) {
2494 				SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2495 			}
2496 		} else {
2497 			if (*locked_tcb == NULL) {
2498 				/*
2499 				 * In this case we found the assoc only
2500 				 * after we locked the create lock. This
2501 				 * means we are in a colliding case and we
2502 				 * must make sure that we unlock the tcb if
2503 				 * its one of the cases where we throw away
2504 				 * the incoming packets.
2505 				 */
2506 				*locked_tcb = *stcb;
2507 
2508 				/*
2509 				 * We must also increment the inp ref count
2510 				 * since the ref_count flags was set when we
2511 				 * did not find the TCB, now we found it
2512 				 * which reduces the refcount.. we must
2513 				 * raise it back out to balance it all :-)
2514 				 */
2515 				SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2516 				if ((*stcb)->sctp_ep != l_inp) {
2517 					SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2518 					    (void *)(*stcb)->sctp_ep, (void *)l_inp);
2519 				}
2520 			}
2521 		}
2522 	}
2523 
2524 	cookie_len -= SCTP_SIGNATURE_SIZE;
2525 	if (*stcb == NULL) {
2526 		/* this is the "normal" case... get a new TCB */
2527 		*stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2528 		    cookie, cookie_len, *inp_p,
2529 		    netp, to, &notification,
2530 		    auth_skipped, auth_offset, auth_len,
2531 		    mflowtype, mflowid,
2532 		    vrf_id, port);
2533 	} else {
2534 		/* this is abnormal... cookie-echo on existing TCB */
2535 		had_a_existing_tcb = 1;
2536 		*stcb = sctp_process_cookie_existing(m, iphlen, offset,
2537 		    src, dst, sh,
2538 		    cookie, cookie_len, *inp_p, *stcb, netp, to,
2539 		    &notification, auth_skipped, auth_offset, auth_len,
2540 		    mflowtype, mflowid,
2541 		    vrf_id, port);
2542 	}
2543 
2544 	if (*stcb == NULL) {
2545 		/* still no TCB... must be bad cookie-echo */
2546 		return (NULL);
2547 	}
2548 	if (*netp != NULL) {
2549 		(*netp)->flowtype = mflowtype;
2550 		(*netp)->flowid = mflowid;
2551 	}
2552 	/*
2553 	 * Ok, we built an association so confirm the address we sent the
2554 	 * INIT-ACK to.
2555 	 */
2556 	netl = sctp_findnet(*stcb, to);
2557 	/*
2558 	 * This code should in theory NOT run but
2559 	 */
2560 	if (netl == NULL) {
2561 		/* TSNH! Huh, why do I need to add this address here? */
2562 		if (sctp_add_remote_addr(*stcb, to, NULL, port,
2563 		    SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2564 			return (NULL);
2565 		}
2566 		netl = sctp_findnet(*stcb, to);
2567 	}
2568 	if (netl) {
2569 		if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2570 			netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2571 			(void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2572 			    netl);
2573 			send_int_conf = 1;
2574 		}
2575 	}
2576 	sctp_start_net_timers(*stcb);
2577 	if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2578 		if (!had_a_existing_tcb ||
2579 		    (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2580 			/*
2581 			 * If we have a NEW cookie or the connect never
2582 			 * reached the connected state during collision we
2583 			 * must do the TCP accept thing.
2584 			 */
2585 			struct socket *so, *oso;
2586 			struct sctp_inpcb *inp;
2587 
2588 			if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2589 				/*
2590 				 * For a restart we will keep the same
2591 				 * socket, no need to do anything. I THINK!!
2592 				 */
2593 				sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2594 				if (send_int_conf) {
2595 					sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2596 					    (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2597 				}
2598 				return (m);
2599 			}
2600 			oso = (*inp_p)->sctp_socket;
2601 			atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2602 			SCTP_TCB_UNLOCK((*stcb));
2603 			CURVNET_SET(oso->so_vnet);
2604 			so = sonewconn(oso, 0
2605 			    );
2606 			CURVNET_RESTORE();
2607 			SCTP_TCB_LOCK((*stcb));
2608 			atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2609 
2610 			if (so == NULL) {
2611 				struct mbuf *op_err;
2612 
2613 				/* Too many sockets */
2614 				SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2615 				op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2616 				sctp_abort_association(*inp_p, NULL, m, iphlen,
2617 				    src, dst, sh, op_err,
2618 				    mflowtype, mflowid,
2619 				    vrf_id, port);
2620 				(void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2621 				    SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2622 				return (NULL);
2623 			}
2624 			inp = (struct sctp_inpcb *)so->so_pcb;
2625 			SCTP_INP_INCR_REF(inp);
2626 			/*
2627 			 * We add the unbound flag here so that if we get an
2628 			 * soabort() before we get the move_pcb done, we
2629 			 * will properly cleanup.
2630 			 */
2631 			inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2632 			    SCTP_PCB_FLAGS_CONNECTED |
2633 			    SCTP_PCB_FLAGS_IN_TCPPOOL |
2634 			    SCTP_PCB_FLAGS_UNBOUND |
2635 			    (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2636 			    SCTP_PCB_FLAGS_DONT_WAKE);
2637 			inp->sctp_features = (*inp_p)->sctp_features;
2638 			inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2639 			inp->sctp_socket = so;
2640 			inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2641 			inp->max_cwnd = (*inp_p)->max_cwnd;
2642 			inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2643 			inp->ecn_supported = (*inp_p)->ecn_supported;
2644 			inp->prsctp_supported = (*inp_p)->prsctp_supported;
2645 			inp->auth_supported = (*inp_p)->auth_supported;
2646 			inp->asconf_supported = (*inp_p)->asconf_supported;
2647 			inp->reconfig_supported = (*inp_p)->reconfig_supported;
2648 			inp->nrsack_supported = (*inp_p)->nrsack_supported;
2649 			inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2650 			inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2651 			inp->sctp_context = (*inp_p)->sctp_context;
2652 			inp->local_strreset_support = (*inp_p)->local_strreset_support;
2653 			inp->fibnum = (*inp_p)->fibnum;
2654 			inp->inp_starting_point_for_iterator = NULL;
2655 			/*
2656 			 * copy in the authentication parameters from the
2657 			 * original endpoint
2658 			 */
2659 			if (inp->sctp_ep.local_hmacs)
2660 				sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2661 			inp->sctp_ep.local_hmacs =
2662 			    sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2663 			if (inp->sctp_ep.local_auth_chunks)
2664 				sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2665 			inp->sctp_ep.local_auth_chunks =
2666 			    sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2667 
2668 			/*
2669 			 * Now we must move it from one hash table to
2670 			 * another and get the tcb in the right place.
2671 			 */
2672 
2673 			/*
2674 			 * This is where the one-2-one socket is put into
2675 			 * the accept state waiting for the accept!
2676 			 */
2677 			if (*stcb) {
2678 				SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2679 			}
2680 			sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2681 
2682 			atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2683 			SCTP_TCB_UNLOCK((*stcb));
2684 
2685 			sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2686 			    0);
2687 			SCTP_TCB_LOCK((*stcb));
2688 			atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2689 
2690 
2691 			/*
2692 			 * now we must check to see if we were aborted while
2693 			 * the move was going on and the lock/unlock
2694 			 * happened.
2695 			 */
2696 			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2697 				/*
2698 				 * yep it was, we leave the assoc attached
2699 				 * to the socket since the sctp_inpcb_free()
2700 				 * call will send an abort for us.
2701 				 */
2702 				SCTP_INP_DECR_REF(inp);
2703 				return (NULL);
2704 			}
2705 			SCTP_INP_DECR_REF(inp);
2706 			/* Switch over to the new guy */
2707 			*inp_p = inp;
2708 			sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2709 			if (send_int_conf) {
2710 				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2711 				    (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2712 			}
2713 
2714 			/*
2715 			 * Pull it from the incomplete queue and wake the
2716 			 * guy
2717 			 */
2718 			soisconnected(so);
2719 			return (m);
2720 		}
2721 	}
2722 	if (notification) {
2723 		sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2724 	}
2725 	if (send_int_conf) {
2726 		sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2727 		    (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2728 	}
2729 	return (m);
2730 }
2731 
2732 static void
2733 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2734     struct sctp_tcb *stcb, struct sctp_nets *net)
2735 {
2736 	/* cp must not be used, others call this without a c-ack :-) */
2737 	struct sctp_association *asoc;
2738 	struct sctp_tmit_chunk *chk;
2739 
2740 	SCTPDBG(SCTP_DEBUG_INPUT2,
2741 	    "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2742 	if ((stcb == NULL) || (net == NULL)) {
2743 		return;
2744 	}
2745 
2746 	asoc = &stcb->asoc;
2747 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2748 		sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2749 		    asoc->overall_error_count,
2750 		    0,
2751 		    SCTP_FROM_SCTP_INPUT,
2752 		    __LINE__);
2753 	}
2754 	asoc->overall_error_count = 0;
2755 	sctp_stop_all_cookie_timers(stcb);
2756 	/* process according to association state */
2757 	if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2758 		/* state change only needed when I am in right state */
2759 		SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2760 		SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2761 		sctp_start_net_timers(stcb);
2762 		if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2763 			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2764 			    stcb->sctp_ep, stcb, NULL);
2765 
2766 		}
2767 		/* update RTO */
2768 		SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2769 		SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2770 		if (asoc->overall_error_count == 0) {
2771 			sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2772 			    SCTP_RTT_FROM_NON_DATA);
2773 		}
2774 		(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2775 		sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2776 		if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2777 		    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2778 			stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2779 			if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2780 				soisconnected(stcb->sctp_socket);
2781 			}
2782 		}
2783 		/*
2784 		 * since we did not send a HB make sure we don't double
2785 		 * things
2786 		 */
2787 		net->hb_responded = 1;
2788 
2789 		if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2790 			/*
2791 			 * We don't need to do the asconf thing, nor hb or
2792 			 * autoclose if the socket is closed.
2793 			 */
2794 			goto closed_socket;
2795 		}
2796 
2797 		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2798 		    stcb, net);
2799 
2800 
2801 		if (stcb->asoc.sctp_autoclose_ticks &&
2802 		    sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2803 			sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2804 			    stcb->sctp_ep, stcb, NULL);
2805 		}
2806 		/*
2807 		 * send ASCONF if parameters are pending and ASCONFs are
2808 		 * allowed (eg. addresses changed when init/cookie echo were
2809 		 * in flight)
2810 		 */
2811 		if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2812 		    (stcb->asoc.asconf_supported == 1) &&
2813 		    (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2814 #ifdef SCTP_TIMER_BASED_ASCONF
2815 			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2816 			    stcb->sctp_ep, stcb,
2817 			    stcb->asoc.primary_destination);
2818 #else
2819 			sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2820 			    SCTP_ADDR_NOT_LOCKED);
2821 #endif
2822 		}
2823 	}
2824 closed_socket:
2825 	/* Toss the cookie if I can */
2826 	sctp_toss_old_cookies(stcb, asoc);
2827 	/* Restart the timer if we have pending data */
2828 	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
2829 		if (chk->whoTo != NULL) {
2830 			break;
2831 		}
2832 	}
2833 	if (chk != NULL) {
2834 		sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2835 	}
2836 }
2837 
2838 static void
2839 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2840     struct sctp_tcb *stcb)
2841 {
2842 	struct sctp_nets *net;
2843 	struct sctp_tmit_chunk *lchk;
2844 	struct sctp_ecne_chunk bkup;
2845 	uint8_t override_bit;
2846 	uint32_t tsn, window_data_tsn;
2847 	int len;
2848 	unsigned int pkt_cnt;
2849 
2850 	len = ntohs(cp->ch.chunk_length);
2851 	if ((len != sizeof(struct sctp_ecne_chunk)) &&
2852 	    (len != sizeof(struct old_sctp_ecne_chunk))) {
2853 		return;
2854 	}
2855 	if (len == sizeof(struct old_sctp_ecne_chunk)) {
2856 		/* Its the old format */
2857 		memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2858 		bkup.num_pkts_since_cwr = htonl(1);
2859 		cp = &bkup;
2860 	}
2861 	SCTP_STAT_INCR(sctps_recvecne);
2862 	tsn = ntohl(cp->tsn);
2863 	pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2864 	lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2865 	if (lchk == NULL) {
2866 		window_data_tsn = stcb->asoc.sending_seq - 1;
2867 	} else {
2868 		window_data_tsn = lchk->rec.data.tsn;
2869 	}
2870 
2871 	/* Find where it was sent to if possible. */
2872 	net = NULL;
2873 	TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2874 		if (lchk->rec.data.tsn == tsn) {
2875 			net = lchk->whoTo;
2876 			net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2877 			break;
2878 		}
2879 		if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
2880 			break;
2881 		}
2882 	}
2883 	if (net == NULL) {
2884 		/*
2885 		 * What to do. A previous send of a CWR was possibly lost.
2886 		 * See how old it is, we may have it marked on the actual
2887 		 * net.
2888 		 */
2889 		TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2890 			if (tsn == net->last_cwr_tsn) {
2891 				/* Found him, send it off */
2892 				break;
2893 			}
2894 		}
2895 		if (net == NULL) {
2896 			/*
2897 			 * If we reach here, we need to send a special CWR
2898 			 * that says hey, we did this a long time ago and
2899 			 * you lost the response.
2900 			 */
2901 			net = TAILQ_FIRST(&stcb->asoc.nets);
2902 			if (net == NULL) {
2903 				/* TSNH */
2904 				return;
2905 			}
2906 			override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2907 		} else {
2908 			override_bit = 0;
2909 		}
2910 	} else {
2911 		override_bit = 0;
2912 	}
2913 	if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2914 	    ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2915 		/*
2916 		 * JRS - Use the congestion control given in the pluggable
2917 		 * CC module
2918 		 */
2919 		stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2920 		/*
2921 		 * We reduce once every RTT. So we will only lower cwnd at
2922 		 * the next sending seq i.e. the window_data_tsn
2923 		 */
2924 		net->cwr_window_tsn = window_data_tsn;
2925 		net->ecn_ce_pkt_cnt += pkt_cnt;
2926 		net->lost_cnt = pkt_cnt;
2927 		net->last_cwr_tsn = tsn;
2928 	} else {
2929 		override_bit |= SCTP_CWR_IN_SAME_WINDOW;
2930 		if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
2931 		    ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2932 			/*
2933 			 * Another loss in the same window update how many
2934 			 * marks/packets lost we have had.
2935 			 */
2936 			int cnt = 1;
2937 
2938 			if (pkt_cnt > net->lost_cnt) {
2939 				/* Should be the case */
2940 				cnt = (pkt_cnt - net->lost_cnt);
2941 				net->ecn_ce_pkt_cnt += cnt;
2942 			}
2943 			net->lost_cnt = pkt_cnt;
2944 			net->last_cwr_tsn = tsn;
2945 			/*
2946 			 * Most CC functions will ignore this call, since we
2947 			 * are in-window yet of the initial CE the peer saw.
2948 			 */
2949 			stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
2950 		}
2951 	}
2952 	/*
2953 	 * We always send a CWR this way if our previous one was lost our
2954 	 * peer will get an update, or if it is not time again to reduce we
2955 	 * still get the cwr to the peer. Note we set the override when we
2956 	 * could not find the TSN on the chunk or the destination network.
2957 	 */
2958 	sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
2959 }
2960 
2961 static void
2962 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
2963 {
2964 	/*
2965 	 * Here we get a CWR from the peer. We must look in the outqueue and
2966 	 * make sure that we have a covered ECNE in the control chunk part.
2967 	 * If so remove it.
2968 	 */
2969 	struct sctp_tmit_chunk *chk, *nchk;
2970 	struct sctp_ecne_chunk *ecne;
2971 	int override;
2972 	uint32_t cwr_tsn;
2973 
2974 	cwr_tsn = ntohl(cp->tsn);
2975 	override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
2976 	TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
2977 		if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
2978 			continue;
2979 		}
2980 		if ((override == 0) && (chk->whoTo != net)) {
2981 			/* Must be from the right src unless override is set */
2982 			continue;
2983 		}
2984 		ecne = mtod(chk->data, struct sctp_ecne_chunk *);
2985 		if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
2986 			/* this covers this ECNE, we can remove it */
2987 			stcb->asoc.ecn_echo_cnt_onq--;
2988 			TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
2989 			    sctp_next);
2990 			stcb->asoc.ctrl_queue_cnt--;
2991 			sctp_m_freem(chk->data);
2992 			chk->data = NULL;
2993 			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
2994 			if (override == 0) {
2995 				break;
2996 			}
2997 		}
2998 	}
2999 }
3000 
3001 static void
3002 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3003     struct sctp_tcb *stcb, struct sctp_nets *net)
3004 {
3005 
3006 	SCTPDBG(SCTP_DEBUG_INPUT2,
3007 	    "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3008 	if (stcb == NULL)
3009 		return;
3010 
3011 	/* process according to association state */
3012 	if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3013 		/* unexpected SHUTDOWN-COMPLETE... so ignore... */
3014 		SCTPDBG(SCTP_DEBUG_INPUT2,
3015 		    "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3016 		SCTP_TCB_UNLOCK(stcb);
3017 		return;
3018 	}
3019 	/* notify upper layer protocol */
3020 	if (stcb->sctp_socket) {
3021 		sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3022 	}
3023 #ifdef INVARIANTS
3024 	if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3025 	    !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3026 	    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3027 		panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3028 	}
3029 #endif
3030 	/* stop the timer */
3031 	sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3032 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3033 	SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3034 	/* free the TCB */
3035 	SCTPDBG(SCTP_DEBUG_INPUT2,
3036 	    "sctp_handle_shutdown_complete: calls free-asoc\n");
3037 	(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3038 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3039 	return;
3040 }
3041 
3042 static int
3043 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3044     struct sctp_nets *net, uint8_t flg)
3045 {
3046 	switch (desc->chunk_type) {
3047 	case SCTP_DATA:
3048 	case SCTP_IDATA:
3049 		/* find the tsn to resend (possibly) */
3050 		{
3051 			uint32_t tsn;
3052 			struct sctp_tmit_chunk *tp1;
3053 
3054 			tsn = ntohl(desc->tsn_ifany);
3055 			TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3056 				if (tp1->rec.data.tsn == tsn) {
3057 					/* found it */
3058 					break;
3059 				}
3060 				if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3061 					/* not found */
3062 					tp1 = NULL;
3063 					break;
3064 				}
3065 			}
3066 			if (tp1 == NULL) {
3067 				/*
3068 				 * Do it the other way , aka without paying
3069 				 * attention to queue seq order.
3070 				 */
3071 				SCTP_STAT_INCR(sctps_pdrpdnfnd);
3072 				TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3073 					if (tp1->rec.data.tsn == tsn) {
3074 						/* found it */
3075 						break;
3076 					}
3077 				}
3078 			}
3079 			if (tp1 == NULL) {
3080 				SCTP_STAT_INCR(sctps_pdrptsnnf);
3081 			}
3082 			if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3083 				if (((flg & SCTP_BADCRC) == 0) &&
3084 				    ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3085 					return (0);
3086 				}
3087 				if ((stcb->asoc.peers_rwnd == 0) &&
3088 				    ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3089 					SCTP_STAT_INCR(sctps_pdrpdiwnp);
3090 					return (0);
3091 				}
3092 				if (stcb->asoc.peers_rwnd == 0 &&
3093 				    (flg & SCTP_FROM_MIDDLE_BOX)) {
3094 					SCTP_STAT_INCR(sctps_pdrpdizrw);
3095 					return (0);
3096 				}
3097 				if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
3098 				    SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
3099 					/* Payload not matching. */
3100 					SCTP_STAT_INCR(sctps_pdrpbadd);
3101 					return (-1);
3102 				}
3103 				if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb),
3104 				    desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
3105 					/* Payload not matching. */
3106 					SCTP_STAT_INCR(sctps_pdrpbadd);
3107 					return (-1);
3108 				}
3109 				if (tp1->do_rtt) {
3110 					/*
3111 					 * this guy had a RTO calculation
3112 					 * pending on it, cancel it
3113 					 */
3114 					if (tp1->whoTo->rto_needed == 0) {
3115 						tp1->whoTo->rto_needed = 1;
3116 					}
3117 					tp1->do_rtt = 0;
3118 				}
3119 				SCTP_STAT_INCR(sctps_pdrpmark);
3120 				if (tp1->sent != SCTP_DATAGRAM_RESEND)
3121 					sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3122 				/*
3123 				 * mark it as if we were doing a FR, since
3124 				 * we will be getting gap ack reports behind
3125 				 * the info from the router.
3126 				 */
3127 				tp1->rec.data.doing_fast_retransmit = 1;
3128 				/*
3129 				 * mark the tsn with what sequences can
3130 				 * cause a new FR.
3131 				 */
3132 				if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3133 					tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3134 				} else {
3135 					tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3136 				}
3137 
3138 				/* restart the timer */
3139 				sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3140 				    stcb, tp1->whoTo,
3141 				    SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3142 				sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3143 				    stcb, tp1->whoTo);
3144 
3145 				/* fix counts and things */
3146 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3147 					sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3148 					    tp1->whoTo->flight_size,
3149 					    tp1->book_size,
3150 					    (uint32_t)(uintptr_t)stcb,
3151 					    tp1->rec.data.tsn);
3152 				}
3153 				if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3154 					sctp_flight_size_decrease(tp1);
3155 					sctp_total_flight_decrease(stcb, tp1);
3156 				}
3157 				tp1->sent = SCTP_DATAGRAM_RESEND;
3158 			} {
3159 				/* audit code */
3160 				unsigned int audit;
3161 
3162 				audit = 0;
3163 				TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3164 					if (tp1->sent == SCTP_DATAGRAM_RESEND)
3165 						audit++;
3166 				}
3167 				TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3168 				    sctp_next) {
3169 					if (tp1->sent == SCTP_DATAGRAM_RESEND)
3170 						audit++;
3171 				}
3172 				if (audit != stcb->asoc.sent_queue_retran_cnt) {
3173 					SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3174 					    audit, stcb->asoc.sent_queue_retran_cnt);
3175 #ifndef SCTP_AUDITING_ENABLED
3176 					stcb->asoc.sent_queue_retran_cnt = audit;
3177 #endif
3178 				}
3179 			}
3180 		}
3181 		break;
3182 	case SCTP_ASCONF:
3183 		{
3184 			struct sctp_tmit_chunk *asconf;
3185 
3186 			TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3187 			    sctp_next) {
3188 				if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3189 					break;
3190 				}
3191 			}
3192 			if (asconf) {
3193 				if (asconf->sent != SCTP_DATAGRAM_RESEND)
3194 					sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3195 				asconf->sent = SCTP_DATAGRAM_RESEND;
3196 				asconf->snd_count--;
3197 			}
3198 		}
3199 		break;
3200 	case SCTP_INITIATION:
3201 		/* resend the INIT */
3202 		stcb->asoc.dropped_special_cnt++;
3203 		if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3204 			/*
3205 			 * If we can get it in, in a few attempts we do
3206 			 * this, otherwise we let the timer fire.
3207 			 */
3208 			sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3209 			    stcb, net,
3210 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3211 			sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3212 		}
3213 		break;
3214 	case SCTP_SELECTIVE_ACK:
3215 	case SCTP_NR_SELECTIVE_ACK:
3216 		/* resend the sack */
3217 		sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3218 		break;
3219 	case SCTP_HEARTBEAT_REQUEST:
3220 		/* resend a demand HB */
3221 		if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3222 			/*
3223 			 * Only retransmit if we KNOW we wont destroy the
3224 			 * tcb
3225 			 */
3226 			sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3227 		}
3228 		break;
3229 	case SCTP_SHUTDOWN:
3230 		sctp_send_shutdown(stcb, net);
3231 		break;
3232 	case SCTP_SHUTDOWN_ACK:
3233 		sctp_send_shutdown_ack(stcb, net);
3234 		break;
3235 	case SCTP_COOKIE_ECHO:
3236 		{
3237 			struct sctp_tmit_chunk *cookie;
3238 
3239 			cookie = NULL;
3240 			TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3241 			    sctp_next) {
3242 				if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3243 					break;
3244 				}
3245 			}
3246 			if (cookie) {
3247 				if (cookie->sent != SCTP_DATAGRAM_RESEND)
3248 					sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3249 				cookie->sent = SCTP_DATAGRAM_RESEND;
3250 				sctp_stop_all_cookie_timers(stcb);
3251 			}
3252 		}
3253 		break;
3254 	case SCTP_COOKIE_ACK:
3255 		sctp_send_cookie_ack(stcb);
3256 		break;
3257 	case SCTP_ASCONF_ACK:
3258 		/* resend last asconf ack */
3259 		sctp_send_asconf_ack(stcb);
3260 		break;
3261 	case SCTP_IFORWARD_CUM_TSN:
3262 	case SCTP_FORWARD_CUM_TSN:
3263 		send_forward_tsn(stcb, &stcb->asoc);
3264 		break;
3265 		/* can't do anything with these */
3266 	case SCTP_PACKET_DROPPED:
3267 	case SCTP_INITIATION_ACK:	/* this should not happen */
3268 	case SCTP_HEARTBEAT_ACK:
3269 	case SCTP_ABORT_ASSOCIATION:
3270 	case SCTP_OPERATION_ERROR:
3271 	case SCTP_SHUTDOWN_COMPLETE:
3272 	case SCTP_ECN_ECHO:
3273 	case SCTP_ECN_CWR:
3274 	default:
3275 		break;
3276 	}
3277 	return (0);
3278 }
3279 
3280 void
3281 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3282 {
3283 	uint32_t i;
3284 	uint16_t temp;
3285 
3286 	/*
3287 	 * We set things to 0xffffffff since this is the last delivered
3288 	 * sequence and we will be sending in 0 after the reset.
3289 	 */
3290 
3291 	if (number_entries) {
3292 		for (i = 0; i < number_entries; i++) {
3293 			temp = ntohs(list[i]);
3294 			if (temp >= stcb->asoc.streamincnt) {
3295 				continue;
3296 			}
3297 			stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3298 		}
3299 	} else {
3300 		list = NULL;
3301 		for (i = 0; i < stcb->asoc.streamincnt; i++) {
3302 			stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3303 		}
3304 	}
3305 	sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3306 }
3307 
3308 static void
3309 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3310 {
3311 	uint32_t i;
3312 	uint16_t temp;
3313 
3314 	if (number_entries > 0) {
3315 		for (i = 0; i < number_entries; i++) {
3316 			temp = ntohs(list[i]);
3317 			if (temp >= stcb->asoc.streamoutcnt) {
3318 				/* no such stream */
3319 				continue;
3320 			}
3321 			stcb->asoc.strmout[temp].next_mid_ordered = 0;
3322 			stcb->asoc.strmout[temp].next_mid_unordered = 0;
3323 		}
3324 	} else {
3325 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3326 			stcb->asoc.strmout[i].next_mid_ordered = 0;
3327 			stcb->asoc.strmout[i].next_mid_unordered = 0;
3328 		}
3329 	}
3330 	sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3331 }
3332 
3333 static void
3334 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3335 {
3336 	uint32_t i;
3337 	uint16_t temp;
3338 
3339 	if (number_entries > 0) {
3340 		for (i = 0; i < number_entries; i++) {
3341 			temp = ntohs(list[i]);
3342 			if (temp >= stcb->asoc.streamoutcnt) {
3343 				/* no such stream */
3344 				continue;
3345 			}
3346 			stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3347 		}
3348 	} else {
3349 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3350 			stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3351 		}
3352 	}
3353 }
3354 
3355 
3356 struct sctp_stream_reset_request *
3357 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3358 {
3359 	struct sctp_association *asoc;
3360 	struct sctp_chunkhdr *ch;
3361 	struct sctp_stream_reset_request *r;
3362 	struct sctp_tmit_chunk *chk;
3363 	int len, clen;
3364 
3365 	asoc = &stcb->asoc;
3366 	if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3367 		asoc->stream_reset_outstanding = 0;
3368 		return (NULL);
3369 	}
3370 	if (stcb->asoc.str_reset == NULL) {
3371 		asoc->stream_reset_outstanding = 0;
3372 		return (NULL);
3373 	}
3374 	chk = stcb->asoc.str_reset;
3375 	if (chk->data == NULL) {
3376 		return (NULL);
3377 	}
3378 	if (bchk) {
3379 		/* he wants a copy of the chk pointer */
3380 		*bchk = chk;
3381 	}
3382 	clen = chk->send_size;
3383 	ch = mtod(chk->data, struct sctp_chunkhdr *);
3384 	r = (struct sctp_stream_reset_request *)(ch + 1);
3385 	if (ntohl(r->request_seq) == seq) {
3386 		/* found it */
3387 		return (r);
3388 	}
3389 	len = SCTP_SIZE32(ntohs(r->ph.param_length));
3390 	if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3391 		/* move to the next one, there can only be a max of two */
3392 		r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3393 		if (ntohl(r->request_seq) == seq) {
3394 			return (r);
3395 		}
3396 	}
3397 	/* that seq is not here */
3398 	return (NULL);
3399 }
3400 
3401 static void
3402 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3403 {
3404 	struct sctp_association *asoc;
3405 	struct sctp_tmit_chunk *chk;
3406 
3407 	asoc = &stcb->asoc;
3408 	chk = asoc->str_reset;
3409 	if (chk == NULL) {
3410 		return;
3411 	}
3412 	asoc->str_reset = NULL;
3413 	sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3414 	    NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3415 	TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3416 	asoc->ctrl_queue_cnt--;
3417 	if (chk->data) {
3418 		sctp_m_freem(chk->data);
3419 		chk->data = NULL;
3420 	}
3421 	sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3422 }
3423 
3424 
3425 static int
3426 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3427     uint32_t seq, uint32_t action,
3428     struct sctp_stream_reset_response *respin)
3429 {
3430 	uint16_t type;
3431 	int lparam_len;
3432 	struct sctp_association *asoc = &stcb->asoc;
3433 	struct sctp_tmit_chunk *chk;
3434 	struct sctp_stream_reset_request *req_param;
3435 	struct sctp_stream_reset_out_request *req_out_param;
3436 	struct sctp_stream_reset_in_request *req_in_param;
3437 	uint32_t number_entries;
3438 
3439 	if (asoc->stream_reset_outstanding == 0) {
3440 		/* duplicate */
3441 		return (0);
3442 	}
3443 	if (seq == stcb->asoc.str_reset_seq_out) {
3444 		req_param = sctp_find_stream_reset(stcb, seq, &chk);
3445 		if (req_param != NULL) {
3446 			stcb->asoc.str_reset_seq_out++;
3447 			type = ntohs(req_param->ph.param_type);
3448 			lparam_len = ntohs(req_param->ph.param_length);
3449 			if (type == SCTP_STR_RESET_OUT_REQUEST) {
3450 				int no_clear = 0;
3451 
3452 				req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3453 				number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3454 				asoc->stream_reset_out_is_outstanding = 0;
3455 				if (asoc->stream_reset_outstanding)
3456 					asoc->stream_reset_outstanding--;
3457 				if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3458 					/* do it */
3459 					sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3460 				} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3461 					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3462 				} else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3463 					/*
3464 					 * Set it up so we don't stop
3465 					 * retransmitting
3466 					 */
3467 					asoc->stream_reset_outstanding++;
3468 					stcb->asoc.str_reset_seq_out--;
3469 					asoc->stream_reset_out_is_outstanding = 1;
3470 					no_clear = 1;
3471 				} else {
3472 					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3473 				}
3474 				if (no_clear == 0) {
3475 					sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3476 				}
3477 			} else if (type == SCTP_STR_RESET_IN_REQUEST) {
3478 				req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3479 				number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3480 				if (asoc->stream_reset_outstanding)
3481 					asoc->stream_reset_outstanding--;
3482 				if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3483 					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3484 					    number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3485 				} else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3486 					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3487 					    number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3488 				}
3489 			} else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3490 				/* Ok we now may have more streams */
3491 				int num_stream;
3492 
3493 				num_stream = stcb->asoc.strm_pending_add_size;
3494 				if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3495 					/* TSNH */
3496 					num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3497 				}
3498 				stcb->asoc.strm_pending_add_size = 0;
3499 				if (asoc->stream_reset_outstanding)
3500 					asoc->stream_reset_outstanding--;
3501 				if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3502 					/* Put the new streams into effect */
3503 					int i;
3504 
3505 					for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3506 						asoc->strmout[i].state = SCTP_STREAM_OPEN;
3507 					}
3508 					asoc->streamoutcnt += num_stream;
3509 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3510 				} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3511 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3512 					    SCTP_STREAM_CHANGE_DENIED);
3513 				} else {
3514 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3515 					    SCTP_STREAM_CHANGE_FAILED);
3516 				}
3517 			} else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3518 				if (asoc->stream_reset_outstanding)
3519 					asoc->stream_reset_outstanding--;
3520 				if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3521 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3522 					    SCTP_STREAM_CHANGE_DENIED);
3523 				} else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3524 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3525 					    SCTP_STREAM_CHANGE_FAILED);
3526 				}
3527 			} else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3528 				/**
3529 				 * a) Adopt the new in tsn.
3530 				 * b) reset the map
3531 				 * c) Adopt the new out-tsn
3532 				 */
3533 				struct sctp_stream_reset_response_tsn *resp;
3534 				struct sctp_forward_tsn_chunk fwdtsn;
3535 				int abort_flag = 0;
3536 
3537 				if (respin == NULL) {
3538 					/* huh ? */
3539 					return (0);
3540 				}
3541 				if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3542 					return (0);
3543 				}
3544 				if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3545 					resp = (struct sctp_stream_reset_response_tsn *)respin;
3546 					asoc->stream_reset_outstanding--;
3547 					fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3548 					fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3549 					fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3550 					sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3551 					if (abort_flag) {
3552 						return (1);
3553 					}
3554 					stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3555 					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3556 						sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3557 					}
3558 
3559 					stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3560 					stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3561 					memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3562 
3563 					stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3564 					memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3565 
3566 					stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3567 					stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3568 
3569 					sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3570 					sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3571 					sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3572 				} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3573 					sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3574 					    SCTP_ASSOC_RESET_DENIED);
3575 				} else {
3576 					sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3577 					    SCTP_ASSOC_RESET_FAILED);
3578 				}
3579 			}
3580 			/* get rid of the request and get the request flags */
3581 			if (asoc->stream_reset_outstanding == 0) {
3582 				sctp_clean_up_stream_reset(stcb);
3583 			}
3584 		}
3585 	}
3586 	if (asoc->stream_reset_outstanding == 0) {
3587 		sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3588 	}
3589 	return (0);
3590 }
3591 
3592 static void
3593 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3594     struct sctp_tmit_chunk *chk,
3595     struct sctp_stream_reset_in_request *req, int trunc)
3596 {
3597 	uint32_t seq;
3598 	int len, i;
3599 	int number_entries;
3600 	uint16_t temp;
3601 
3602 	/*
3603 	 * peer wants me to send a str-reset to him for my outgoing seq's if
3604 	 * seq_in is right.
3605 	 */
3606 	struct sctp_association *asoc = &stcb->asoc;
3607 
3608 	seq = ntohl(req->request_seq);
3609 	if (asoc->str_reset_seq_in == seq) {
3610 		asoc->last_reset_action[1] = asoc->last_reset_action[0];
3611 		if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3612 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3613 		} else if (trunc) {
3614 			/* Can't do it, since they exceeded our buffer size  */
3615 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3616 		} else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3617 			len = ntohs(req->ph.param_length);
3618 			number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3619 			if (number_entries) {
3620 				for (i = 0; i < number_entries; i++) {
3621 					temp = ntohs(req->list_of_streams[i]);
3622 					if (temp >= stcb->asoc.streamoutcnt) {
3623 						asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3624 						goto bad_boy;
3625 					}
3626 					req->list_of_streams[i] = temp;
3627 				}
3628 				for (i = 0; i < number_entries; i++) {
3629 					if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3630 						stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3631 					}
3632 				}
3633 			} else {
3634 				/* Its all */
3635 				for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3636 					if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3637 						stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3638 				}
3639 			}
3640 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3641 		} else {
3642 			/* Can't do it, since we have sent one out */
3643 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3644 		}
3645 bad_boy:
3646 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3647 		asoc->str_reset_seq_in++;
3648 	} else if (asoc->str_reset_seq_in - 1 == seq) {
3649 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3650 	} else if (asoc->str_reset_seq_in - 2 == seq) {
3651 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3652 	} else {
3653 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3654 	}
3655 	sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3656 }
3657 
3658 static int
3659 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3660     struct sctp_tmit_chunk *chk,
3661     struct sctp_stream_reset_tsn_request *req)
3662 {
3663 	/* reset all in and out and update the tsn */
3664 	/*
3665 	 * A) reset my str-seq's on in and out. B) Select a receive next,
3666 	 * and set cum-ack to it. Also process this selected number as a
3667 	 * fwd-tsn as well. C) set in the response my next sending seq.
3668 	 */
3669 	struct sctp_forward_tsn_chunk fwdtsn;
3670 	struct sctp_association *asoc = &stcb->asoc;
3671 	int abort_flag = 0;
3672 	uint32_t seq;
3673 
3674 	seq = ntohl(req->request_seq);
3675 	if (asoc->str_reset_seq_in == seq) {
3676 		asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3677 		if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3678 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3679 		} else {
3680 			fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3681 			fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3682 			fwdtsn.ch.chunk_flags = 0;
3683 			fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3684 			sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3685 			if (abort_flag) {
3686 				return (1);
3687 			}
3688 			asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3689 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3690 				sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3691 			}
3692 			asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3693 			asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3694 			memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3695 			asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3696 			memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3697 			atomic_add_int(&asoc->sending_seq, 1);
3698 			/* save off historical data for retrans */
3699 			asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3700 			asoc->last_sending_seq[0] = asoc->sending_seq;
3701 			asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3702 			asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3703 			sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3704 			sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3705 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3706 			sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3707 		}
3708 		sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3709 		    asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3710 		asoc->str_reset_seq_in++;
3711 	} else if (asoc->str_reset_seq_in - 1 == seq) {
3712 		sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3713 		    asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3714 	} else if (asoc->str_reset_seq_in - 2 == seq) {
3715 		sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3716 		    asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3717 	} else {
3718 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3719 	}
3720 	return (0);
3721 }
3722 
3723 static void
3724 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3725     struct sctp_tmit_chunk *chk,
3726     struct sctp_stream_reset_out_request *req, int trunc)
3727 {
3728 	uint32_t seq, tsn;
3729 	int number_entries, len;
3730 	struct sctp_association *asoc = &stcb->asoc;
3731 
3732 	seq = ntohl(req->request_seq);
3733 
3734 	/* now if its not a duplicate we process it */
3735 	if (asoc->str_reset_seq_in == seq) {
3736 		len = ntohs(req->ph.param_length);
3737 		number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3738 		/*
3739 		 * the sender is resetting, handle the list issue.. we must
3740 		 * a) verify if we can do the reset, if so no problem b) If
3741 		 * we can't do the reset we must copy the request. c) queue
3742 		 * it, and setup the data in processor to trigger it off
3743 		 * when needed and dequeue all the queued data.
3744 		 */
3745 		tsn = ntohl(req->send_reset_at_tsn);
3746 
3747 		/* move the reset action back one */
3748 		asoc->last_reset_action[1] = asoc->last_reset_action[0];
3749 		if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3750 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3751 		} else if (trunc) {
3752 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3753 		} else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3754 			/* we can do it now */
3755 			sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3756 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3757 		} else {
3758 			/*
3759 			 * we must queue it up and thus wait for the TSN's
3760 			 * to arrive that are at or before tsn
3761 			 */
3762 			struct sctp_stream_reset_list *liste;
3763 			int siz;
3764 
3765 			siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3766 			SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3767 			    siz, SCTP_M_STRESET);
3768 			if (liste == NULL) {
3769 				/* gak out of memory */
3770 				asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3771 				sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3772 				return;
3773 			}
3774 			liste->seq = seq;
3775 			liste->tsn = tsn;
3776 			liste->number_entries = number_entries;
3777 			memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3778 			TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3779 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3780 		}
3781 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3782 		asoc->str_reset_seq_in++;
3783 	} else if ((asoc->str_reset_seq_in - 1) == seq) {
3784 		/*
3785 		 * one seq back, just echo back last action since my
3786 		 * response was lost.
3787 		 */
3788 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3789 	} else if ((asoc->str_reset_seq_in - 2) == seq) {
3790 		/*
3791 		 * two seq back, just echo back last action since my
3792 		 * response was lost.
3793 		 */
3794 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3795 	} else {
3796 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3797 	}
3798 }
3799 
3800 static void
3801 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3802     struct sctp_stream_reset_add_strm *str_add)
3803 {
3804 	/*
3805 	 * Peer is requesting to add more streams. If its within our
3806 	 * max-streams we will allow it.
3807 	 */
3808 	uint32_t num_stream, i;
3809 	uint32_t seq;
3810 	struct sctp_association *asoc = &stcb->asoc;
3811 	struct sctp_queued_to_read *ctl, *nctl;
3812 
3813 	/* Get the number. */
3814 	seq = ntohl(str_add->request_seq);
3815 	num_stream = ntohs(str_add->number_of_streams);
3816 	/* Now what would be the new total? */
3817 	if (asoc->str_reset_seq_in == seq) {
3818 		num_stream += stcb->asoc.streamincnt;
3819 		stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3820 		if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3821 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3822 		} else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3823 		    (num_stream > 0xffff)) {
3824 			/* We must reject it they ask for to many */
3825 	denied:
3826 			stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3827 		} else {
3828 			/* Ok, we can do that :-) */
3829 			struct sctp_stream_in *oldstrm;
3830 
3831 			/* save off the old */
3832 			oldstrm = stcb->asoc.strmin;
3833 			SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3834 			    (num_stream * sizeof(struct sctp_stream_in)),
3835 			    SCTP_M_STRMI);
3836 			if (stcb->asoc.strmin == NULL) {
3837 				stcb->asoc.strmin = oldstrm;
3838 				goto denied;
3839 			}
3840 			/* copy off the old data */
3841 			for (i = 0; i < stcb->asoc.streamincnt; i++) {
3842 				TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3843 				TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3844 				stcb->asoc.strmin[i].sid = i;
3845 				stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
3846 				stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3847 				stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
3848 				/* now anything on those queues? */
3849 				TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
3850 					TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
3851 					TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
3852 				}
3853 				TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
3854 					TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
3855 					TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
3856 				}
3857 			}
3858 			/* Init the new streams */
3859 			for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3860 				TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3861 				TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3862 				stcb->asoc.strmin[i].sid = i;
3863 				stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3864 				stcb->asoc.strmin[i].pd_api_started = 0;
3865 				stcb->asoc.strmin[i].delivery_started = 0;
3866 			}
3867 			SCTP_FREE(oldstrm, SCTP_M_STRMI);
3868 			/* update the size */
3869 			stcb->asoc.streamincnt = num_stream;
3870 			stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3871 			sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3872 		}
3873 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3874 		asoc->str_reset_seq_in++;
3875 	} else if ((asoc->str_reset_seq_in - 1) == seq) {
3876 		/*
3877 		 * one seq back, just echo back last action since my
3878 		 * response was lost.
3879 		 */
3880 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3881 	} else if ((asoc->str_reset_seq_in - 2) == seq) {
3882 		/*
3883 		 * two seq back, just echo back last action since my
3884 		 * response was lost.
3885 		 */
3886 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3887 	} else {
3888 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3889 
3890 	}
3891 }
3892 
3893 static void
3894 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3895     struct sctp_stream_reset_add_strm *str_add)
3896 {
3897 	/*
3898 	 * Peer is requesting to add more streams. If its within our
3899 	 * max-streams we will allow it.
3900 	 */
3901 	uint16_t num_stream;
3902 	uint32_t seq;
3903 	struct sctp_association *asoc = &stcb->asoc;
3904 
3905 	/* Get the number. */
3906 	seq = ntohl(str_add->request_seq);
3907 	num_stream = ntohs(str_add->number_of_streams);
3908 	/* Now what would be the new total? */
3909 	if (asoc->str_reset_seq_in == seq) {
3910 		stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3911 		if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3912 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3913 		} else if (stcb->asoc.stream_reset_outstanding) {
3914 			/* We must reject it we have something pending */
3915 			stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3916 		} else {
3917 			/* Ok, we can do that :-) */
3918 			int mychk;
3919 
3920 			mychk = stcb->asoc.streamoutcnt;
3921 			mychk += num_stream;
3922 			if (mychk < 0x10000) {
3923 				stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3924 				if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
3925 					stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3926 				}
3927 			} else {
3928 				stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3929 			}
3930 		}
3931 		sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
3932 		asoc->str_reset_seq_in++;
3933 	} else if ((asoc->str_reset_seq_in - 1) == seq) {
3934 		/*
3935 		 * one seq back, just echo back last action since my
3936 		 * response was lost.
3937 		 */
3938 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3939 	} else if ((asoc->str_reset_seq_in - 2) == seq) {
3940 		/*
3941 		 * two seq back, just echo back last action since my
3942 		 * response was lost.
3943 		 */
3944 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3945 	} else {
3946 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3947 	}
3948 }
3949 
3950 #ifdef __GNUC__
3951 __attribute__((noinline))
3952 #endif
3953 static int
3954 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3955     struct sctp_chunkhdr *ch_req)
3956 {
3957 	uint16_t remaining_length, param_len, ptype;
3958 	struct sctp_paramhdr pstore;
3959 	uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3960 	uint32_t seq = 0;
3961 	int num_req = 0;
3962 	int trunc = 0;
3963 	struct sctp_tmit_chunk *chk;
3964 	struct sctp_chunkhdr *ch;
3965 	struct sctp_paramhdr *ph;
3966 	int ret_code = 0;
3967 	int num_param = 0;
3968 
3969 	/* now it may be a reset or a reset-response */
3970 	remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
3971 
3972 	/* setup for adding the response */
3973 	sctp_alloc_a_chunk(stcb, chk);
3974 	if (chk == NULL) {
3975 		return (ret_code);
3976 	}
3977 	chk->copy_by_ref = 0;
3978 	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3979 	chk->rec.chunk_id.can_take_data = 0;
3980 	chk->flags = 0;
3981 	chk->asoc = &stcb->asoc;
3982 	chk->no_fr_allowed = 0;
3983 	chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3984 	chk->book_size_scale = 0;
3985 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
3986 	if (chk->data == NULL) {
3987 strres_nochunk:
3988 		if (chk->data) {
3989 			sctp_m_freem(chk->data);
3990 			chk->data = NULL;
3991 		}
3992 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3993 		return (ret_code);
3994 	}
3995 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
3996 
3997 	/* setup chunk parameters */
3998 	chk->sent = SCTP_DATAGRAM_UNSENT;
3999 	chk->snd_count = 0;
4000 	chk->whoTo = NULL;
4001 
4002 	ch = mtod(chk->data, struct sctp_chunkhdr *);
4003 	ch->chunk_type = SCTP_STREAM_RESET;
4004 	ch->chunk_flags = 0;
4005 	ch->chunk_length = htons(chk->send_size);
4006 	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4007 	offset += sizeof(struct sctp_chunkhdr);
4008 	while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4009 		ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4010 		if (ph == NULL) {
4011 			/* TSNH */
4012 			break;
4013 		}
4014 		param_len = ntohs(ph->param_length);
4015 		if ((param_len > remaining_length) ||
4016 		    (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4017 			/* bad parameter length */
4018 			break;
4019 		}
4020 		ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4021 		    (uint8_t *)&cstore);
4022 		if (ph == NULL) {
4023 			/* TSNH */
4024 			break;
4025 		}
4026 		ptype = ntohs(ph->param_type);
4027 		num_param++;
4028 		if (param_len > sizeof(cstore)) {
4029 			trunc = 1;
4030 		} else {
4031 			trunc = 0;
4032 		}
4033 		if (num_param > SCTP_MAX_RESET_PARAMS) {
4034 			/* hit the max of parameters already sorry.. */
4035 			break;
4036 		}
4037 		if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4038 			struct sctp_stream_reset_out_request *req_out;
4039 
4040 			if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4041 				break;
4042 			}
4043 			req_out = (struct sctp_stream_reset_out_request *)ph;
4044 			num_req++;
4045 			if (stcb->asoc.stream_reset_outstanding) {
4046 				seq = ntohl(req_out->response_seq);
4047 				if (seq == stcb->asoc.str_reset_seq_out) {
4048 					/* implicit ack */
4049 					(void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4050 				}
4051 			}
4052 			sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4053 		} else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4054 			struct sctp_stream_reset_add_strm *str_add;
4055 
4056 			if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4057 				break;
4058 			}
4059 			str_add = (struct sctp_stream_reset_add_strm *)ph;
4060 			num_req++;
4061 			sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4062 		} else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4063 			struct sctp_stream_reset_add_strm *str_add;
4064 
4065 			if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4066 				break;
4067 			}
4068 			str_add = (struct sctp_stream_reset_add_strm *)ph;
4069 			num_req++;
4070 			sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4071 		} else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4072 			struct sctp_stream_reset_in_request *req_in;
4073 
4074 			num_req++;
4075 			req_in = (struct sctp_stream_reset_in_request *)ph;
4076 			sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4077 		} else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4078 			struct sctp_stream_reset_tsn_request *req_tsn;
4079 
4080 			num_req++;
4081 			req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4082 			if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4083 				ret_code = 1;
4084 				goto strres_nochunk;
4085 			}
4086 			/* no more */
4087 			break;
4088 		} else if (ptype == SCTP_STR_RESET_RESPONSE) {
4089 			struct sctp_stream_reset_response *resp;
4090 			uint32_t result;
4091 
4092 			if (param_len < sizeof(struct sctp_stream_reset_response)) {
4093 				break;
4094 			}
4095 			resp = (struct sctp_stream_reset_response *)ph;
4096 			seq = ntohl(resp->response_seq);
4097 			result = ntohl(resp->result);
4098 			if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4099 				ret_code = 1;
4100 				goto strres_nochunk;
4101 			}
4102 		} else {
4103 			break;
4104 		}
4105 		offset += SCTP_SIZE32(param_len);
4106 		if (remaining_length >= SCTP_SIZE32(param_len)) {
4107 			remaining_length -= SCTP_SIZE32(param_len);
4108 		} else {
4109 			remaining_length = 0;
4110 		}
4111 	}
4112 	if (num_req == 0) {
4113 		/* we have no response free the stuff */
4114 		goto strres_nochunk;
4115 	}
4116 	/* ok we have a chunk to link in */
4117 	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4118 	    chk,
4119 	    sctp_next);
4120 	stcb->asoc.ctrl_queue_cnt++;
4121 	return (ret_code);
4122 }
4123 
4124 /*
4125  * Handle a router or endpoints report of a packet loss, there are two ways
4126  * to handle this, either we get the whole packet and must disect it
4127  * ourselves (possibly with truncation and or corruption) or it is a summary
4128  * from a middle box that did the disectting for us.
4129  */
4130 static void
4131 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4132     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4133 {
4134 	struct sctp_chunk_desc desc;
4135 	struct sctp_chunkhdr *chk_hdr;
4136 	struct sctp_data_chunk *data_chunk;
4137 	struct sctp_idata_chunk *idata_chunk;
4138 	uint32_t bottle_bw, on_queue;
4139 	uint32_t offset, chk_len;
4140 	uint16_t trunc_len;
4141 	uint16_t pktdrp_len;
4142 	uint8_t pktdrp_flags;
4143 
4144 	KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
4145 	    ("PKTDROP chunk too small"));
4146 	pktdrp_flags = cp->ch.chunk_flags;
4147 	pktdrp_len = ntohs(cp->ch.chunk_length);
4148 	KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
4149 	if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
4150 		trunc_len = ntohs(cp->trunc_len);
4151 		if (trunc_len <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
4152 			/* The peer plays games with us. */
4153 			return;
4154 		}
4155 	} else {
4156 		trunc_len = 0;
4157 	}
4158 	limit -= sizeof(struct sctp_pktdrop_chunk);
4159 	offset = 0;
4160 	if (offset == limit) {
4161 		if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4162 			SCTP_STAT_INCR(sctps_pdrpbwrpt);
4163 		}
4164 	} else if (offset + sizeof(struct sctphdr) > limit) {
4165 		/* Only a partial SCTP common header. */
4166 		SCTP_STAT_INCR(sctps_pdrpcrupt);
4167 		offset = limit;
4168 	} else {
4169 		/* XXX: Check embedded SCTP common header. */
4170 		offset += sizeof(struct sctphdr);
4171 	}
4172 	/* Now parse through the chunks themselves. */
4173 	while (offset < limit) {
4174 		if (offset + sizeof(struct sctp_chunkhdr) > limit) {
4175 			SCTP_STAT_INCR(sctps_pdrpcrupt);
4176 			break;
4177 		}
4178 		chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
4179 		desc.chunk_type = chk_hdr->chunk_type;
4180 		/* get amount we need to move */
4181 		chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
4182 		if (chk_len < sizeof(struct sctp_chunkhdr)) {
4183 			/* Someone is lying... */
4184 			break;
4185 		}
4186 		if (desc.chunk_type == SCTP_DATA) {
4187 			if (stcb->asoc.idata_supported) {
4188 				/* Some is playing games with us. */
4189 				break;
4190 			}
4191 			if (chk_len <= sizeof(struct sctp_data_chunk)) {
4192 				/* Some is playing games with us. */
4193 				break;
4194 			}
4195 			if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4196 				/*
4197 				 * Not enough data bytes available in the
4198 				 * chunk.
4199 				 */
4200 				SCTP_STAT_INCR(sctps_pdrpnedat);
4201 				goto next_chunk;
4202 			}
4203 			if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4204 				/* Not enough data in buffer. */
4205 				break;
4206 			}
4207 			data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
4208 			memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4209 			desc.tsn_ifany = data_chunk->dp.tsn;
4210 			if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4211 				SCTP_STAT_INCR(sctps_pdrpmbda);
4212 			}
4213 		} else if (desc.chunk_type == SCTP_IDATA) {
4214 			if (!stcb->asoc.idata_supported) {
4215 				/* Some is playing games with us. */
4216 				break;
4217 			}
4218 			if (chk_len <= sizeof(struct sctp_idata_chunk)) {
4219 				/* Some is playing games with us. */
4220 				break;
4221 			}
4222 			if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4223 				/*
4224 				 * Not enough data bytes available in the
4225 				 * chunk.
4226 				 */
4227 				SCTP_STAT_INCR(sctps_pdrpnedat);
4228 				goto next_chunk;
4229 			}
4230 			if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4231 				/* Not enough data in buffer. */
4232 				break;
4233 			}
4234 			idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
4235 			memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4236 			desc.tsn_ifany = idata_chunk->dp.tsn;
4237 			if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4238 				SCTP_STAT_INCR(sctps_pdrpmbda);
4239 			}
4240 		} else {
4241 			if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4242 				SCTP_STAT_INCR(sctps_pdrpmbct);
4243 			}
4244 		}
4245 		if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
4246 			SCTP_STAT_INCR(sctps_pdrppdbrk);
4247 			break;
4248 		}
4249 next_chunk:
4250 		offset += SCTP_SIZE32(chk_len);
4251 	}
4252 	/* Now update any rwnd --- possibly */
4253 	if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4254 		/* From a peer, we get a rwnd report */
4255 		uint32_t a_rwnd;
4256 
4257 		SCTP_STAT_INCR(sctps_pdrpfehos);
4258 
4259 		bottle_bw = ntohl(cp->bottle_bw);
4260 		on_queue = ntohl(cp->current_onq);
4261 		if (bottle_bw && on_queue) {
4262 			/* a rwnd report is in here */
4263 			if (bottle_bw > on_queue)
4264 				a_rwnd = bottle_bw - on_queue;
4265 			else
4266 				a_rwnd = 0;
4267 
4268 			if (a_rwnd == 0)
4269 				stcb->asoc.peers_rwnd = 0;
4270 			else {
4271 				if (a_rwnd > stcb->asoc.total_flight) {
4272 					stcb->asoc.peers_rwnd =
4273 					    a_rwnd - stcb->asoc.total_flight;
4274 				} else {
4275 					stcb->asoc.peers_rwnd = 0;
4276 				}
4277 				if (stcb->asoc.peers_rwnd <
4278 				    stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4279 					/* SWS sender side engages */
4280 					stcb->asoc.peers_rwnd = 0;
4281 				}
4282 			}
4283 		}
4284 	} else {
4285 		SCTP_STAT_INCR(sctps_pdrpfmbox);
4286 	}
4287 
4288 	/* now middle boxes in sat networks get a cwnd bump */
4289 	if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
4290 	    (stcb->asoc.sat_t3_loss_recovery == 0) &&
4291 	    (stcb->asoc.sat_network)) {
4292 		/*
4293 		 * This is debatable but for sat networks it makes sense
4294 		 * Note if a T3 timer has went off, we will prohibit any
4295 		 * changes to cwnd until we exit the t3 loss recovery.
4296 		 */
4297 		stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4298 		    net, cp, &bottle_bw, &on_queue);
4299 	}
4300 }
4301 
4302 /*
4303  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4304  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4305  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4306  * length of the complete packet outputs: - length: modified to remaining
4307  * length after control processing - netp: modified to new sctp_nets after
4308  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4309  * bad packet,...) otherwise return the tcb for this packet
4310  */
4311 #ifdef __GNUC__
4312 __attribute__((noinline))
4313 #endif
4314 static struct sctp_tcb *
4315 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4316     struct sockaddr *src, struct sockaddr *dst,
4317     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4318     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4319     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4320     uint32_t vrf_id, uint16_t port)
4321 {
4322 	struct sctp_association *asoc;
4323 	struct mbuf *op_err;
4324 	char msg[SCTP_DIAG_INFO_LEN];
4325 	uint32_t vtag_in;
4326 	int num_chunks = 0;	/* number of control chunks processed */
4327 	uint32_t chk_length, contiguous;
4328 	int ret;
4329 	int abort_no_unlock = 0;
4330 	int ecne_seen = 0;
4331 
4332 	/*
4333 	 * How big should this be, and should it be alloc'd? Lets try the
4334 	 * d-mtu-ceiling for now (2k) and that should hopefully work ...
4335 	 * until we get into jumbo grams and such..
4336 	 */
4337 	uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4338 	int got_auth = 0;
4339 	uint32_t auth_offset = 0, auth_len = 0;
4340 	int auth_skipped = 0;
4341 	int asconf_cnt = 0;
4342 
4343 	SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4344 	    iphlen, *offset, length, (void *)stcb);
4345 
4346 	if (stcb) {
4347 		SCTP_TCB_LOCK_ASSERT(stcb);
4348 	}
4349 	/* validate chunk header length... */
4350 	if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4351 		SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4352 		    ntohs(ch->chunk_length));
4353 		*offset = length;
4354 		return (stcb);
4355 	}
4356 	/*
4357 	 * validate the verification tag
4358 	 */
4359 	vtag_in = ntohl(sh->v_tag);
4360 
4361 	if (ch->chunk_type == SCTP_INITIATION) {
4362 		SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4363 		    ntohs(ch->chunk_length), vtag_in);
4364 		if (vtag_in != 0) {
4365 			/* protocol error- silently discard... */
4366 			SCTP_STAT_INCR(sctps_badvtag);
4367 			if (stcb != NULL) {
4368 				SCTP_TCB_UNLOCK(stcb);
4369 			}
4370 			return (NULL);
4371 		}
4372 	} else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4373 		/*
4374 		 * If there is no stcb, skip the AUTH chunk and process
4375 		 * later after a stcb is found (to validate the lookup was
4376 		 * valid.
4377 		 */
4378 		if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4379 		    (stcb == NULL) &&
4380 		    (inp->auth_supported == 1)) {
4381 			/* save this chunk for later processing */
4382 			auth_skipped = 1;
4383 			auth_offset = *offset;
4384 			auth_len = ntohs(ch->chunk_length);
4385 
4386 			/* (temporarily) move past this chunk */
4387 			*offset += SCTP_SIZE32(auth_len);
4388 			if (*offset >= length) {
4389 				/* no more data left in the mbuf chain */
4390 				*offset = length;
4391 				return (NULL);
4392 			}
4393 			ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4394 			    sizeof(struct sctp_chunkhdr), chunk_buf);
4395 		}
4396 		if (ch == NULL) {
4397 			/* Help */
4398 			*offset = length;
4399 			return (stcb);
4400 		}
4401 		if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4402 			goto process_control_chunks;
4403 		}
4404 		/*
4405 		 * first check if it's an ASCONF with an unknown src addr we
4406 		 * need to look inside to find the association
4407 		 */
4408 		if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4409 			struct sctp_chunkhdr *asconf_ch = ch;
4410 			uint32_t asconf_offset = 0, asconf_len = 0;
4411 
4412 			/* inp's refcount may be reduced */
4413 			SCTP_INP_INCR_REF(inp);
4414 
4415 			asconf_offset = *offset;
4416 			do {
4417 				asconf_len = ntohs(asconf_ch->chunk_length);
4418 				if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4419 					break;
4420 				stcb = sctp_findassociation_ep_asconf(m,
4421 				    *offset,
4422 				    dst,
4423 				    sh, &inp, netp, vrf_id);
4424 				if (stcb != NULL)
4425 					break;
4426 				asconf_offset += SCTP_SIZE32(asconf_len);
4427 				asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4428 				    sizeof(struct sctp_chunkhdr), chunk_buf);
4429 			} while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4430 			if (stcb == NULL) {
4431 				/*
4432 				 * reduce inp's refcount if not reduced in
4433 				 * sctp_findassociation_ep_asconf().
4434 				 */
4435 				SCTP_INP_DECR_REF(inp);
4436 			}
4437 
4438 			/* now go back and verify any auth chunk to be sure */
4439 			if (auth_skipped && (stcb != NULL)) {
4440 				struct sctp_auth_chunk *auth;
4441 
4442 				if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
4443 					auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
4444 					got_auth = 1;
4445 					auth_skipped = 0;
4446 				} else {
4447 					auth = NULL;
4448 				}
4449 				if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4450 				    auth_offset)) {
4451 					/* auth HMAC failed so dump it */
4452 					*offset = length;
4453 					return (stcb);
4454 				} else {
4455 					/* remaining chunks are HMAC checked */
4456 					stcb->asoc.authenticated = 1;
4457 				}
4458 			}
4459 		}
4460 		if (stcb == NULL) {
4461 			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4462 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4463 			    msg);
4464 			/* no association, so it's out of the blue... */
4465 			sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4466 			    mflowtype, mflowid, inp->fibnum,
4467 			    vrf_id, port);
4468 			*offset = length;
4469 			return (NULL);
4470 		}
4471 		asoc = &stcb->asoc;
4472 		/* ABORT and SHUTDOWN can use either v_tag... */
4473 		if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4474 		    (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4475 		    (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4476 			/* Take the T-bit always into account. */
4477 			if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4478 			    (vtag_in == asoc->my_vtag)) ||
4479 			    (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4480 			    (asoc->peer_vtag != htonl(0)) &&
4481 			    (vtag_in == asoc->peer_vtag))) {
4482 				/* this is valid */
4483 			} else {
4484 				/* drop this packet... */
4485 				SCTP_STAT_INCR(sctps_badvtag);
4486 				if (stcb != NULL) {
4487 					SCTP_TCB_UNLOCK(stcb);
4488 				}
4489 				return (NULL);
4490 			}
4491 		} else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4492 			if (vtag_in != asoc->my_vtag) {
4493 				/*
4494 				 * this could be a stale SHUTDOWN-ACK or the
4495 				 * peer never got the SHUTDOWN-COMPLETE and
4496 				 * is still hung; we have started a new asoc
4497 				 * but it won't complete until the shutdown
4498 				 * is completed
4499 				 */
4500 				if (stcb != NULL) {
4501 					SCTP_TCB_UNLOCK(stcb);
4502 				}
4503 				SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4504 				op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4505 				    msg);
4506 				sctp_handle_ootb(m, iphlen, *offset, src, dst,
4507 				    sh, inp, op_err,
4508 				    mflowtype, mflowid, fibnum,
4509 				    vrf_id, port);
4510 				return (NULL);
4511 			}
4512 		} else {
4513 			/* for all other chunks, vtag must match */
4514 			if (vtag_in != asoc->my_vtag) {
4515 				/* invalid vtag... */
4516 				SCTPDBG(SCTP_DEBUG_INPUT3,
4517 				    "invalid vtag: %xh, expect %xh\n",
4518 				    vtag_in, asoc->my_vtag);
4519 				SCTP_STAT_INCR(sctps_badvtag);
4520 				if (stcb != NULL) {
4521 					SCTP_TCB_UNLOCK(stcb);
4522 				}
4523 				*offset = length;
4524 				return (NULL);
4525 			}
4526 		}
4527 	}			/* end if !SCTP_COOKIE_ECHO */
4528 	/*
4529 	 * process all control chunks...
4530 	 */
4531 	if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4532 	    (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4533 	    (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4534 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4535 		/* implied cookie-ack.. we must have lost the ack */
4536 		sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4537 		    *netp);
4538 	}
4539 
4540 process_control_chunks:
4541 	while (IS_SCTP_CONTROL(ch)) {
4542 		/* validate chunk length */
4543 		chk_length = ntohs(ch->chunk_length);
4544 		SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4545 		    ch->chunk_type, chk_length);
4546 		SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4547 		if (chk_length < sizeof(*ch) ||
4548 		    (*offset + (int)chk_length) > length) {
4549 			*offset = length;
4550 			return (stcb);
4551 		}
4552 		SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4553 		/*
4554 		 * INIT and INIT-ACK only gets the init ack "header" portion
4555 		 * only because we don't have to process the peer's COOKIE.
4556 		 * All others get a complete chunk.
4557 		 */
4558 		switch (ch->chunk_type) {
4559 		case SCTP_INITIATION:
4560 			contiguous = sizeof(struct sctp_init_chunk);
4561 			break;
4562 		case SCTP_INITIATION_ACK:
4563 			contiguous = sizeof(struct sctp_init_ack_chunk);
4564 			break;
4565 		default:
4566 			contiguous = min(chk_length, sizeof(chunk_buf));
4567 			break;
4568 		}
4569 		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4570 		    contiguous,
4571 		    chunk_buf);
4572 		if (ch == NULL) {
4573 			*offset = length;
4574 			if (stcb != NULL) {
4575 				SCTP_TCB_UNLOCK(stcb);
4576 			}
4577 			return (NULL);
4578 		}
4579 
4580 		num_chunks++;
4581 		/* Save off the last place we got a control from */
4582 		if (stcb != NULL) {
4583 			if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4584 				/*
4585 				 * allow last_control to be NULL if
4586 				 * ASCONF... ASCONF processing will find the
4587 				 * right net later
4588 				 */
4589 				if ((netp != NULL) && (*netp != NULL))
4590 					stcb->asoc.last_control_chunk_from = *netp;
4591 			}
4592 		}
4593 #ifdef SCTP_AUDITING_ENABLED
4594 		sctp_audit_log(0xB0, ch->chunk_type);
4595 #endif
4596 
4597 		/* check to see if this chunk required auth, but isn't */
4598 		if ((stcb != NULL) &&
4599 		    sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4600 		    !stcb->asoc.authenticated) {
4601 			/* "silently" ignore */
4602 			SCTP_STAT_INCR(sctps_recvauthmissing);
4603 			goto next_chunk;
4604 		}
4605 		switch (ch->chunk_type) {
4606 		case SCTP_INITIATION:
4607 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4608 			/* The INIT chunk must be the only chunk. */
4609 			if ((num_chunks > 1) ||
4610 			    (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4611 				/* RFC 4960 requires that no ABORT is sent */
4612 				*offset = length;
4613 				if (stcb != NULL) {
4614 					SCTP_TCB_UNLOCK(stcb);
4615 				}
4616 				return (NULL);
4617 			}
4618 			/* Honor our resource limit. */
4619 			if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4620 				op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4621 				sctp_abort_association(inp, stcb, m, iphlen,
4622 				    src, dst, sh, op_err,
4623 				    mflowtype, mflowid,
4624 				    vrf_id, port);
4625 				*offset = length;
4626 				return (NULL);
4627 			}
4628 			sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4629 			    (struct sctp_init_chunk *)ch, inp,
4630 			    stcb, *netp, &abort_no_unlock,
4631 			    mflowtype, mflowid,
4632 			    vrf_id, port);
4633 			*offset = length;
4634 			if ((!abort_no_unlock) && (stcb != NULL)) {
4635 				SCTP_TCB_UNLOCK(stcb);
4636 			}
4637 			return (NULL);
4638 			break;
4639 		case SCTP_PAD_CHUNK:
4640 			break;
4641 		case SCTP_INITIATION_ACK:
4642 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4643 			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4644 				/* We are not interested anymore */
4645 				if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4646 					;
4647 				} else {
4648 					*offset = length;
4649 					if (stcb != NULL) {
4650 						(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4651 						    SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4652 					}
4653 					return (NULL);
4654 				}
4655 			}
4656 			/* The INIT-ACK chunk must be the only chunk. */
4657 			if ((num_chunks > 1) ||
4658 			    (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4659 				*offset = length;
4660 				return (stcb);
4661 			}
4662 			if ((netp != NULL) && (*netp != NULL)) {
4663 				ret = sctp_handle_init_ack(m, iphlen, *offset,
4664 				    src, dst, sh,
4665 				    (struct sctp_init_ack_chunk *)ch,
4666 				    stcb, *netp,
4667 				    &abort_no_unlock,
4668 				    mflowtype, mflowid,
4669 				    vrf_id);
4670 			} else {
4671 				ret = -1;
4672 			}
4673 			*offset = length;
4674 			if (abort_no_unlock) {
4675 				return (NULL);
4676 			}
4677 			/*
4678 			 * Special case, I must call the output routine to
4679 			 * get the cookie echoed
4680 			 */
4681 			if ((stcb != NULL) && (ret == 0)) {
4682 				sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4683 			}
4684 			return (stcb);
4685 			break;
4686 		case SCTP_SELECTIVE_ACK:
4687 		case SCTP_NR_SELECTIVE_ACK:
4688 			{
4689 				int abort_now = 0;
4690 				uint32_t a_rwnd, cum_ack;
4691 				uint16_t num_seg, num_nr_seg, num_dup;
4692 				uint8_t flags;
4693 				int offset_seg, offset_dup;
4694 
4695 				SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4696 				    ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4697 				SCTP_STAT_INCR(sctps_recvsacks);
4698 				if (stcb == NULL) {
4699 					SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4700 					    (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4701 					break;
4702 				}
4703 				if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4704 					if (chk_length < sizeof(struct sctp_sack_chunk)) {
4705 						SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4706 						break;
4707 					}
4708 				} else {
4709 					if (stcb->asoc.nrsack_supported == 0) {
4710 						goto unknown_chunk;
4711 					}
4712 					if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4713 						SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4714 						break;
4715 					}
4716 				}
4717 				if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4718 					/*-
4719 					 * If we have sent a shutdown-ack, we will pay no
4720 					 * attention to a sack sent in to us since
4721 					 * we don't care anymore.
4722 					 */
4723 					break;
4724 				}
4725 				flags = ch->chunk_flags;
4726 				if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4727 					struct sctp_sack_chunk *sack;
4728 
4729 					sack = (struct sctp_sack_chunk *)ch;
4730 					cum_ack = ntohl(sack->sack.cum_tsn_ack);
4731 					num_seg = ntohs(sack->sack.num_gap_ack_blks);
4732 					num_nr_seg = 0;
4733 					num_dup = ntohs(sack->sack.num_dup_tsns);
4734 					a_rwnd = ntohl(sack->sack.a_rwnd);
4735 					if (sizeof(struct sctp_sack_chunk) +
4736 					    num_seg * sizeof(struct sctp_gap_ack_block) +
4737 					    num_dup * sizeof(uint32_t) != chk_length) {
4738 						SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4739 						break;
4740 					}
4741 					offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4742 					offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4743 				} else {
4744 					struct sctp_nr_sack_chunk *nr_sack;
4745 
4746 					nr_sack = (struct sctp_nr_sack_chunk *)ch;
4747 					cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4748 					num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4749 					num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4750 					num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4751 					a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4752 					if (sizeof(struct sctp_nr_sack_chunk) +
4753 					    (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4754 					    num_dup * sizeof(uint32_t) != chk_length) {
4755 						SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4756 						break;
4757 					}
4758 					offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4759 					offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4760 				}
4761 				SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4762 				    (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4763 				    cum_ack, num_seg, a_rwnd);
4764 				stcb->asoc.seen_a_sack_this_pkt = 1;
4765 				if ((stcb->asoc.pr_sctp_cnt == 0) &&
4766 				    (num_seg == 0) && (num_nr_seg == 0) &&
4767 				    SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4768 				    (stcb->asoc.saw_sack_with_frags == 0) &&
4769 				    (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4770 				    (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4771 					/*
4772 					 * We have a SIMPLE sack having no
4773 					 * prior segments and data on sent
4774 					 * queue to be acked. Use the faster
4775 					 * path sack processing. We also
4776 					 * allow window update sacks with no
4777 					 * missing segments to go this way
4778 					 * too.
4779 					 */
4780 					sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4781 					    &abort_now, ecne_seen);
4782 				} else {
4783 					if ((netp != NULL) && (*netp != NULL)) {
4784 						sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4785 						    num_seg, num_nr_seg, num_dup, &abort_now, flags,
4786 						    cum_ack, a_rwnd, ecne_seen);
4787 					}
4788 				}
4789 				if (abort_now) {
4790 					/* ABORT signal from sack processing */
4791 					*offset = length;
4792 					return (NULL);
4793 				}
4794 				if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4795 				    TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4796 				    (stcb->asoc.stream_queue_cnt == 0)) {
4797 					sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4798 				}
4799 				break;
4800 			}
4801 		case SCTP_HEARTBEAT_REQUEST:
4802 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4803 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4804 				SCTP_STAT_INCR(sctps_recvheartbeat);
4805 				sctp_send_heartbeat_ack(stcb, m, *offset,
4806 				    chk_length, *netp);
4807 			}
4808 			break;
4809 		case SCTP_HEARTBEAT_ACK:
4810 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
4811 			if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4812 				/* Its not ours */
4813 				*offset = length;
4814 				return (stcb);
4815 			}
4816 			SCTP_STAT_INCR(sctps_recvheartbeatack);
4817 			if ((netp != NULL) && (*netp != NULL)) {
4818 				sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4819 				    stcb, *netp);
4820 			}
4821 			break;
4822 		case SCTP_ABORT_ASSOCIATION:
4823 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4824 			    (void *)stcb);
4825 			*offset = length;
4826 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4827 				if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
4828 					return (NULL);
4829 				} else {
4830 					return (stcb);
4831 				}
4832 			} else {
4833 				return (NULL);
4834 			}
4835 			break;
4836 		case SCTP_SHUTDOWN:
4837 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4838 			    (void *)stcb);
4839 			if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4840 				*offset = length;
4841 				return (stcb);
4842 			}
4843 			if ((netp != NULL) && (*netp != NULL)) {
4844 				int abort_flag = 0;
4845 
4846 				sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4847 				    stcb, *netp, &abort_flag);
4848 				if (abort_flag) {
4849 					*offset = length;
4850 					return (NULL);
4851 				}
4852 			}
4853 			break;
4854 		case SCTP_SHUTDOWN_ACK:
4855 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
4856 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4857 				sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4858 			}
4859 			*offset = length;
4860 			return (NULL);
4861 			break;
4862 		case SCTP_OPERATION_ERROR:
4863 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
4864 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
4865 			    sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
4866 				*offset = length;
4867 				return (NULL);
4868 			}
4869 			break;
4870 		case SCTP_COOKIE_ECHO:
4871 			SCTPDBG(SCTP_DEBUG_INPUT3,
4872 			    "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
4873 			if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
4874 				;
4875 			} else {
4876 				if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4877 					/* We are not interested anymore */
4878 			abend:
4879 					if (stcb != NULL) {
4880 						SCTP_TCB_UNLOCK(stcb);
4881 					}
4882 					*offset = length;
4883 					return (NULL);
4884 				}
4885 			}
4886 			/*-
4887 			 * First are we accepting? We do this again here
4888 			 * since it is possible that a previous endpoint WAS
4889 			 * listening responded to a INIT-ACK and then
4890 			 * closed. We opened and bound.. and are now no
4891 			 * longer listening.
4892 			 *
4893 			 * XXXGL: notes on checking listen queue length.
4894 			 * 1) SCTP_IS_LISTENING() doesn't necessarily mean
4895 			 *    SOLISTENING(), because a listening "UDP type"
4896 			 *    socket isn't listening in terms of the socket
4897 			 *    layer.  It is a normal data flow socket, that
4898 			 *    can fork off new connections.  Thus, we should
4899 			 *    look into sol_qlen only in case we are !UDP.
4900 			 * 2) Checking sol_qlen in general requires locking
4901 			 *    the socket, and this code lacks that.
4902 			 */
4903 			if ((stcb == NULL) &&
4904 			    (!SCTP_IS_LISTENING(inp) ||
4905 			    (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
4906 			    inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
4907 				if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4908 				    (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4909 					op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4910 					sctp_abort_association(inp, stcb, m, iphlen,
4911 					    src, dst, sh, op_err,
4912 					    mflowtype, mflowid,
4913 					    vrf_id, port);
4914 				}
4915 				*offset = length;
4916 				return (NULL);
4917 			} else {
4918 				struct mbuf *ret_buf;
4919 				struct sctp_inpcb *linp;
4920 				struct sctp_tmit_chunk *chk;
4921 
4922 				if (stcb) {
4923 					linp = NULL;
4924 				} else {
4925 					linp = inp;
4926 				}
4927 
4928 				if (linp != NULL) {
4929 					SCTP_ASOC_CREATE_LOCK(linp);
4930 					if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
4931 					    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4932 						SCTP_ASOC_CREATE_UNLOCK(linp);
4933 						goto abend;
4934 					}
4935 				}
4936 
4937 				if (netp != NULL) {
4938 					struct sctp_tcb *locked_stcb;
4939 
4940 					locked_stcb = stcb;
4941 					ret_buf =
4942 					    sctp_handle_cookie_echo(m, iphlen,
4943 					    *offset,
4944 					    src, dst,
4945 					    sh,
4946 					    (struct sctp_cookie_echo_chunk *)ch,
4947 					    &inp, &stcb, netp,
4948 					    auth_skipped,
4949 					    auth_offset,
4950 					    auth_len,
4951 					    &locked_stcb,
4952 					    mflowtype,
4953 					    mflowid,
4954 					    vrf_id,
4955 					    port);
4956 					if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
4957 						SCTP_TCB_UNLOCK(locked_stcb);
4958 					}
4959 					if (stcb != NULL) {
4960 						SCTP_TCB_LOCK_ASSERT(stcb);
4961 					}
4962 				} else {
4963 					ret_buf = NULL;
4964 				}
4965 				if (linp != NULL) {
4966 					SCTP_ASOC_CREATE_UNLOCK(linp);
4967 				}
4968 				if (ret_buf == NULL) {
4969 					if (stcb != NULL) {
4970 						SCTP_TCB_UNLOCK(stcb);
4971 					}
4972 					SCTPDBG(SCTP_DEBUG_INPUT3,
4973 					    "GAK, null buffer\n");
4974 					*offset = length;
4975 					return (NULL);
4976 				}
4977 				/* if AUTH skipped, see if it verified... */
4978 				if (auth_skipped) {
4979 					got_auth = 1;
4980 					auth_skipped = 0;
4981 				}
4982 				/* Restart the timer if we have pending data */
4983 				TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
4984 					if (chk->whoTo != NULL) {
4985 						break;
4986 					}
4987 				}
4988 				if (chk != NULL) {
4989 					sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
4990 				}
4991 			}
4992 			break;
4993 		case SCTP_COOKIE_ACK:
4994 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
4995 			if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
4996 				return (stcb);
4997 			}
4998 			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4999 				/* We are not interested anymore */
5000 				if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5001 					;
5002 				} else if (stcb) {
5003 					(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5004 					    SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5005 					*offset = length;
5006 					return (NULL);
5007 				}
5008 			}
5009 			if ((netp != NULL) && (*netp != NULL)) {
5010 				sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5011 			}
5012 			break;
5013 		case SCTP_ECN_ECHO:
5014 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5015 			if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5016 				/* Its not ours */
5017 				*offset = length;
5018 				return (stcb);
5019 			}
5020 			if (stcb->asoc.ecn_supported == 0) {
5021 				goto unknown_chunk;
5022 			}
5023 			sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5024 			ecne_seen = 1;
5025 			break;
5026 		case SCTP_ECN_CWR:
5027 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5028 			if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5029 				*offset = length;
5030 				return (stcb);
5031 			}
5032 			if (stcb->asoc.ecn_supported == 0) {
5033 				goto unknown_chunk;
5034 			}
5035 			sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5036 			break;
5037 		case SCTP_SHUTDOWN_COMPLETE:
5038 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5039 			/* must be first and only chunk */
5040 			if ((num_chunks > 1) ||
5041 			    (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5042 				*offset = length;
5043 				return (stcb);
5044 			}
5045 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5046 				sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5047 				    stcb, *netp);
5048 			}
5049 			*offset = length;
5050 			return (NULL);
5051 			break;
5052 		case SCTP_ASCONF:
5053 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5054 			if (stcb != NULL) {
5055 				if (stcb->asoc.asconf_supported == 0) {
5056 					goto unknown_chunk;
5057 				}
5058 				sctp_handle_asconf(m, *offset, src,
5059 				    (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5060 				asconf_cnt++;
5061 			}
5062 			break;
5063 		case SCTP_ASCONF_ACK:
5064 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5065 			if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5066 				/* Its not ours */
5067 				*offset = length;
5068 				return (stcb);
5069 			}
5070 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5071 				if (stcb->asoc.asconf_supported == 0) {
5072 					goto unknown_chunk;
5073 				}
5074 				/* He's alive so give him credit */
5075 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5076 					sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5077 					    stcb->asoc.overall_error_count,
5078 					    0,
5079 					    SCTP_FROM_SCTP_INPUT,
5080 					    __LINE__);
5081 				}
5082 				stcb->asoc.overall_error_count = 0;
5083 				sctp_handle_asconf_ack(m, *offset,
5084 				    (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5085 				if (abort_no_unlock)
5086 					return (NULL);
5087 			}
5088 			break;
5089 		case SCTP_FORWARD_CUM_TSN:
5090 		case SCTP_IFORWARD_CUM_TSN:
5091 			SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5092 			    ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
5093 			if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5094 				/* Its not ours */
5095 				*offset = length;
5096 				return (stcb);
5097 			}
5098 
5099 			if (stcb != NULL) {
5100 				int abort_flag = 0;
5101 
5102 				if (stcb->asoc.prsctp_supported == 0) {
5103 					goto unknown_chunk;
5104 				}
5105 				if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
5106 				    ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
5107 					if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
5108 						SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
5109 					} else {
5110 						SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
5111 					}
5112 					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5113 					sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
5114 					*offset = length;
5115 					return (NULL);
5116 				}
5117 				*fwd_tsn_seen = 1;
5118 				if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5119 					/* We are not interested anymore */
5120 					(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5121 					    SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5122 					*offset = length;
5123 					return (NULL);
5124 				}
5125 				/*
5126 				 * For sending a SACK this looks like DATA
5127 				 * chunks.
5128 				 */
5129 				stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5130 				sctp_handle_forward_tsn(stcb,
5131 				    (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5132 				if (abort_flag) {
5133 					*offset = length;
5134 					return (NULL);
5135 				}
5136 			}
5137 			break;
5138 		case SCTP_STREAM_RESET:
5139 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5140 			if ((stcb == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req))) {
5141 				/* Its not ours */
5142 				*offset = length;
5143 				return (stcb);
5144 			}
5145 			if (stcb->asoc.reconfig_supported == 0) {
5146 				goto unknown_chunk;
5147 			}
5148 			if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5149 				/* stop processing */
5150 				*offset = length;
5151 				return (NULL);
5152 			}
5153 			break;
5154 		case SCTP_PACKET_DROPPED:
5155 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5156 			/* re-get it all please */
5157 			if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5158 				/* Its not ours */
5159 				*offset = length;
5160 				return (stcb);
5161 			}
5162 
5163 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5164 				if (stcb->asoc.pktdrop_supported == 0) {
5165 					goto unknown_chunk;
5166 				}
5167 				sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5168 				    stcb, *netp,
5169 				    min(chk_length, contiguous));
5170 			}
5171 			break;
5172 		case SCTP_AUTHENTICATION:
5173 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5174 			if (stcb == NULL) {
5175 				/* save the first AUTH for later processing */
5176 				if (auth_skipped == 0) {
5177 					auth_offset = *offset;
5178 					auth_len = chk_length;
5179 					auth_skipped = 1;
5180 				}
5181 				/* skip this chunk (temporarily) */
5182 				goto next_chunk;
5183 			}
5184 			if (stcb->asoc.auth_supported == 0) {
5185 				goto unknown_chunk;
5186 			}
5187 			if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5188 			    (chk_length > (sizeof(struct sctp_auth_chunk) +
5189 			    SCTP_AUTH_DIGEST_LEN_MAX))) {
5190 				/* Its not ours */
5191 				*offset = length;
5192 				return (stcb);
5193 			}
5194 			if (got_auth == 1) {
5195 				/* skip this chunk... it's already auth'd */
5196 				goto next_chunk;
5197 			}
5198 			got_auth = 1;
5199 			if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
5200 				/* auth HMAC failed so dump the packet */
5201 				*offset = length;
5202 				return (stcb);
5203 			} else {
5204 				/* remaining chunks are HMAC checked */
5205 				stcb->asoc.authenticated = 1;
5206 			}
5207 			break;
5208 
5209 		default:
5210 	unknown_chunk:
5211 			/* it's an unknown chunk! */
5212 			if ((ch->chunk_type & 0x40) &&
5213 			    (stcb != NULL) &&
5214 			    (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
5215 			    (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
5216 			    (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5217 				struct sctp_gen_error_cause *cause;
5218 				int len;
5219 
5220 				op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5221 				    0, M_NOWAIT, 1, MT_DATA);
5222 				if (op_err != NULL) {
5223 					len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5224 					cause = mtod(op_err, struct sctp_gen_error_cause *);
5225 					cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5226 					cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5227 					SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5228 					SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5229 					if (SCTP_BUF_NEXT(op_err) != NULL) {
5230 #ifdef SCTP_MBUF_LOGGING
5231 						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5232 							sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5233 						}
5234 #endif
5235 						sctp_queue_op_err(stcb, op_err);
5236 					} else {
5237 						sctp_m_freem(op_err);
5238 					}
5239 				}
5240 			}
5241 			if ((ch->chunk_type & 0x80) == 0) {
5242 				/* discard this packet */
5243 				*offset = length;
5244 				return (stcb);
5245 			}	/* else skip this bad chunk and continue... */
5246 			break;
5247 		}		/* switch (ch->chunk_type) */
5248 
5249 
5250 next_chunk:
5251 		/* get the next chunk */
5252 		*offset += SCTP_SIZE32(chk_length);
5253 		if (*offset >= length) {
5254 			/* no more data left in the mbuf chain */
5255 			break;
5256 		}
5257 		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5258 		    sizeof(struct sctp_chunkhdr), chunk_buf);
5259 		if (ch == NULL) {
5260 			*offset = length;
5261 			return (stcb);
5262 		}
5263 	}			/* while */
5264 
5265 	if ((asconf_cnt > 0) && (stcb != NULL)) {
5266 		sctp_send_asconf_ack(stcb);
5267 	}
5268 	return (stcb);
5269 }
5270 
5271 
5272 /*
5273  * common input chunk processing (v4 and v6)
5274  */
5275 void
5276 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5277     struct sockaddr *src, struct sockaddr *dst,
5278     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5279     uint8_t compute_crc,
5280     uint8_t ecn_bits,
5281     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5282     uint32_t vrf_id, uint16_t port)
5283 {
5284 	uint32_t high_tsn;
5285 	int fwd_tsn_seen = 0, data_processed = 0;
5286 	struct mbuf *m = *mm, *op_err;
5287 	char msg[SCTP_DIAG_INFO_LEN];
5288 	int un_sent;
5289 	int cnt_ctrl_ready = 0;
5290 	struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5291 	struct sctp_tcb *stcb = NULL;
5292 	struct sctp_nets *net = NULL;
5293 
5294 	SCTP_STAT_INCR(sctps_recvdatagrams);
5295 #ifdef SCTP_AUDITING_ENABLED
5296 	sctp_audit_log(0xE0, 1);
5297 	sctp_auditing(0, inp, stcb, net);
5298 #endif
5299 	if (compute_crc != 0) {
5300 		uint32_t check, calc_check;
5301 
5302 		check = sh->checksum;
5303 		sh->checksum = 0;
5304 		calc_check = sctp_calculate_cksum(m, iphlen);
5305 		sh->checksum = check;
5306 		if (calc_check != check) {
5307 			SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5308 			    calc_check, check, (void *)m, length, iphlen);
5309 			stcb = sctp_findassociation_addr(m, offset, src, dst,
5310 			    sh, ch, &inp, &net, vrf_id);
5311 #if defined(INET) || defined(INET6)
5312 			if ((ch->chunk_type != SCTP_INITIATION) &&
5313 			    (net != NULL) && (net->port != port)) {
5314 				if (net->port == 0) {
5315 					/* UDP encapsulation turned on. */
5316 					net->mtu -= sizeof(struct udphdr);
5317 					if (stcb->asoc.smallest_mtu > net->mtu) {
5318 						sctp_pathmtu_adjustment(stcb, net->mtu);
5319 					}
5320 				} else if (port == 0) {
5321 					/* UDP encapsulation turned off. */
5322 					net->mtu += sizeof(struct udphdr);
5323 					/* XXX Update smallest_mtu */
5324 				}
5325 				net->port = port;
5326 			}
5327 #endif
5328 			if (net != NULL) {
5329 				net->flowtype = mflowtype;
5330 				net->flowid = mflowid;
5331 			}
5332 			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5333 			if ((inp != NULL) && (stcb != NULL)) {
5334 				sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5335 				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5336 			} else if ((inp != NULL) && (stcb == NULL)) {
5337 				inp_decr = inp;
5338 			}
5339 			SCTP_STAT_INCR(sctps_badsum);
5340 			SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5341 			goto out;
5342 		}
5343 	}
5344 	/* Destination port of 0 is illegal, based on RFC4960. */
5345 	if (sh->dest_port == 0) {
5346 		SCTP_STAT_INCR(sctps_hdrops);
5347 		goto out;
5348 	}
5349 	stcb = sctp_findassociation_addr(m, offset, src, dst,
5350 	    sh, ch, &inp, &net, vrf_id);
5351 #if defined(INET) || defined(INET6)
5352 	if ((ch->chunk_type != SCTP_INITIATION) &&
5353 	    (net != NULL) && (net->port != port)) {
5354 		if (net->port == 0) {
5355 			/* UDP encapsulation turned on. */
5356 			net->mtu -= sizeof(struct udphdr);
5357 			if (stcb->asoc.smallest_mtu > net->mtu) {
5358 				sctp_pathmtu_adjustment(stcb, net->mtu);
5359 			}
5360 		} else if (port == 0) {
5361 			/* UDP encapsulation turned off. */
5362 			net->mtu += sizeof(struct udphdr);
5363 			/* XXX Update smallest_mtu */
5364 		}
5365 		net->port = port;
5366 	}
5367 #endif
5368 	if (net != NULL) {
5369 		net->flowtype = mflowtype;
5370 		net->flowid = mflowid;
5371 	}
5372 	if (inp == NULL) {
5373 		SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5374 		SCTP_STAT_INCR(sctps_noport);
5375 		if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5376 			goto out;
5377 		}
5378 		if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5379 			sctp_send_shutdown_complete2(src, dst, sh,
5380 			    mflowtype, mflowid, fibnum,
5381 			    vrf_id, port);
5382 			goto out;
5383 		}
5384 		if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5385 			goto out;
5386 		}
5387 		if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5388 			if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5389 			    ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5390 			    (ch->chunk_type != SCTP_INIT))) {
5391 				op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5392 				    "Out of the blue");
5393 				sctp_send_abort(m, iphlen, src, dst,
5394 				    sh, 0, op_err,
5395 				    mflowtype, mflowid, fibnum,
5396 				    vrf_id, port);
5397 			}
5398 		}
5399 		goto out;
5400 	} else if (stcb == NULL) {
5401 		inp_decr = inp;
5402 	}
5403 	SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5404 	    (void *)m, iphlen, offset, length, (void *)stcb);
5405 	if (stcb) {
5406 		/* always clear this before beginning a packet */
5407 		stcb->asoc.authenticated = 0;
5408 		stcb->asoc.seen_a_sack_this_pkt = 0;
5409 		SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5410 		    (void *)stcb, stcb->asoc.state);
5411 
5412 		if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5413 		    (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5414 			/*-
5415 			 * If we hit here, we had a ref count
5416 			 * up when the assoc was aborted and the
5417 			 * timer is clearing out the assoc, we should
5418 			 * NOT respond to any packet.. its OOTB.
5419 			 */
5420 			SCTP_TCB_UNLOCK(stcb);
5421 			stcb = NULL;
5422 			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5423 			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5424 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5425 			    msg);
5426 			sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5427 			    mflowtype, mflowid, inp->fibnum,
5428 			    vrf_id, port);
5429 			goto out;
5430 		}
5431 	}
5432 	if (IS_SCTP_CONTROL(ch)) {
5433 		/* process the control portion of the SCTP packet */
5434 		/* sa_ignore NO_NULL_CHK */
5435 		stcb = sctp_process_control(m, iphlen, &offset, length,
5436 		    src, dst, sh, ch,
5437 		    inp, stcb, &net, &fwd_tsn_seen,
5438 		    mflowtype, mflowid, fibnum,
5439 		    vrf_id, port);
5440 		if (stcb) {
5441 			/*
5442 			 * This covers us if the cookie-echo was there and
5443 			 * it changes our INP.
5444 			 */
5445 			inp = stcb->sctp_ep;
5446 #if defined(INET) || defined(INET6)
5447 			if ((ch->chunk_type != SCTP_INITIATION) &&
5448 			    (net != NULL) && (net->port != port)) {
5449 				if (net->port == 0) {
5450 					/* UDP encapsulation turned on. */
5451 					net->mtu -= sizeof(struct udphdr);
5452 					if (stcb->asoc.smallest_mtu > net->mtu) {
5453 						sctp_pathmtu_adjustment(stcb, net->mtu);
5454 					}
5455 				} else if (port == 0) {
5456 					/* UDP encapsulation turned off. */
5457 					net->mtu += sizeof(struct udphdr);
5458 					/* XXX Update smallest_mtu */
5459 				}
5460 				net->port = port;
5461 			}
5462 #endif
5463 		}
5464 	} else {
5465 		/*
5466 		 * no control chunks, so pre-process DATA chunks (these
5467 		 * checks are taken care of by control processing)
5468 		 */
5469 
5470 		/*
5471 		 * if DATA only packet, and auth is required, then punt...
5472 		 * can't have authenticated without any AUTH (control)
5473 		 * chunks
5474 		 */
5475 		if ((stcb != NULL) &&
5476 		    sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5477 			/* "silently" ignore */
5478 			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5479 			SCTP_STAT_INCR(sctps_recvauthmissing);
5480 			goto out;
5481 		}
5482 		if (stcb == NULL) {
5483 			/* out of the blue DATA chunk */
5484 			SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5485 			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5486 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5487 			    msg);
5488 			sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5489 			    mflowtype, mflowid, fibnum,
5490 			    vrf_id, port);
5491 			goto out;
5492 		}
5493 		if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5494 			/* v_tag mismatch! */
5495 			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5496 			SCTP_STAT_INCR(sctps_badvtag);
5497 			goto out;
5498 		}
5499 	}
5500 
5501 	SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5502 	if (stcb == NULL) {
5503 		/*
5504 		 * no valid TCB for this packet, or we found it's a bad
5505 		 * packet while processing control, or we're done with this
5506 		 * packet (done or skip rest of data), so we drop it...
5507 		 */
5508 		goto out;
5509 	}
5510 
5511 	/*
5512 	 * DATA chunk processing
5513 	 */
5514 	/* plow through the data chunks while length > offset */
5515 
5516 	/*
5517 	 * Rest should be DATA only.  Check authentication state if AUTH for
5518 	 * DATA is required.
5519 	 */
5520 	if ((length > offset) &&
5521 	    (stcb != NULL) &&
5522 	    sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5523 	    !stcb->asoc.authenticated) {
5524 		/* "silently" ignore */
5525 		SCTP_STAT_INCR(sctps_recvauthmissing);
5526 		SCTPDBG(SCTP_DEBUG_AUTH1,
5527 		    "Data chunk requires AUTH, skipped\n");
5528 		goto trigger_send;
5529 	}
5530 	if (length > offset) {
5531 		int retval;
5532 
5533 		/*
5534 		 * First check to make sure our state is correct. We would
5535 		 * not get here unless we really did have a tag, so we don't
5536 		 * abort if this happens, just dump the chunk silently.
5537 		 */
5538 		switch (SCTP_GET_STATE(stcb)) {
5539 		case SCTP_STATE_COOKIE_ECHOED:
5540 			/*
5541 			 * we consider data with valid tags in this state
5542 			 * shows us the cookie-ack was lost. Imply it was
5543 			 * there.
5544 			 */
5545 			sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5546 			break;
5547 		case SCTP_STATE_COOKIE_WAIT:
5548 			/*
5549 			 * We consider OOTB any data sent during asoc setup.
5550 			 */
5551 			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5552 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5553 			    msg);
5554 			sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5555 			    mflowtype, mflowid, inp->fibnum,
5556 			    vrf_id, port);
5557 			goto out;
5558 			/* sa_ignore NOTREACHED */
5559 			break;
5560 		case SCTP_STATE_EMPTY:	/* should not happen */
5561 		case SCTP_STATE_INUSE:	/* should not happen */
5562 		case SCTP_STATE_SHUTDOWN_RECEIVED:	/* This is a peer error */
5563 		case SCTP_STATE_SHUTDOWN_ACK_SENT:
5564 		default:
5565 			goto out;
5566 			/* sa_ignore NOTREACHED */
5567 			break;
5568 		case SCTP_STATE_OPEN:
5569 		case SCTP_STATE_SHUTDOWN_SENT:
5570 			break;
5571 		}
5572 		/* plow through the data chunks while length > offset */
5573 		retval = sctp_process_data(mm, iphlen, &offset, length,
5574 		    inp, stcb, net, &high_tsn);
5575 		if (retval == 2) {
5576 			/*
5577 			 * The association aborted, NO UNLOCK needed since
5578 			 * the association is destroyed.
5579 			 */
5580 			stcb = NULL;
5581 			goto out;
5582 		}
5583 		data_processed = 1;
5584 		/*
5585 		 * Anything important needs to have been m_copy'ed in
5586 		 * process_data
5587 		 */
5588 	}
5589 
5590 	/* take care of ecn */
5591 	if ((data_processed == 1) &&
5592 	    (stcb->asoc.ecn_supported == 1) &&
5593 	    ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5594 		/* Yep, we need to add a ECNE */
5595 		sctp_send_ecn_echo(stcb, net, high_tsn);
5596 	}
5597 
5598 	if ((data_processed == 0) && (fwd_tsn_seen)) {
5599 		int was_a_gap;
5600 		uint32_t highest_tsn;
5601 
5602 		if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5603 			highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5604 		} else {
5605 			highest_tsn = stcb->asoc.highest_tsn_inside_map;
5606 		}
5607 		was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5608 		stcb->asoc.send_sack = 1;
5609 		sctp_sack_check(stcb, was_a_gap);
5610 	} else if (fwd_tsn_seen) {
5611 		stcb->asoc.send_sack = 1;
5612 	}
5613 	/* trigger send of any chunks in queue... */
5614 trigger_send:
5615 #ifdef SCTP_AUDITING_ENABLED
5616 	sctp_audit_log(0xE0, 2);
5617 	sctp_auditing(1, inp, stcb, net);
5618 #endif
5619 	SCTPDBG(SCTP_DEBUG_INPUT1,
5620 	    "Check for chunk output prw:%d tqe:%d tf=%d\n",
5621 	    stcb->asoc.peers_rwnd,
5622 	    TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5623 	    stcb->asoc.total_flight);
5624 	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5625 	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5626 		cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5627 	}
5628 	if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5629 	    cnt_ctrl_ready ||
5630 	    stcb->asoc.trigger_reset ||
5631 	    ((un_sent > 0) &&
5632 	    (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
5633 		SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5634 		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5635 		SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5636 	}
5637 #ifdef SCTP_AUDITING_ENABLED
5638 	sctp_audit_log(0xE0, 3);
5639 	sctp_auditing(2, inp, stcb, net);
5640 #endif
5641 out:
5642 	if (stcb != NULL) {
5643 		SCTP_TCB_UNLOCK(stcb);
5644 	}
5645 	if (inp_decr != NULL) {
5646 		/* reduce ref-count */
5647 		SCTP_INP_WLOCK(inp_decr);
5648 		SCTP_INP_DECR_REF(inp_decr);
5649 		SCTP_INP_WUNLOCK(inp_decr);
5650 	}
5651 	return;
5652 }
5653 
5654 #ifdef INET
5655 void
5656 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5657 {
5658 	struct mbuf *m;
5659 	int iphlen;
5660 	uint32_t vrf_id = 0;
5661 	uint8_t ecn_bits;
5662 	struct sockaddr_in src, dst;
5663 	struct ip *ip;
5664 	struct sctphdr *sh;
5665 	struct sctp_chunkhdr *ch;
5666 	int length, offset;
5667 	uint8_t compute_crc;
5668 	uint32_t mflowid;
5669 	uint8_t mflowtype;
5670 	uint16_t fibnum;
5671 
5672 	iphlen = off;
5673 	if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5674 		SCTP_RELEASE_PKT(i_pak);
5675 		return;
5676 	}
5677 	m = SCTP_HEADER_TO_CHAIN(i_pak);
5678 #ifdef SCTP_MBUF_LOGGING
5679 	/* Log in any input mbufs */
5680 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5681 		sctp_log_mbc(m, SCTP_MBUF_INPUT);
5682 	}
5683 #endif
5684 #ifdef SCTP_PACKET_LOGGING
5685 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5686 		sctp_packet_log(m);
5687 	}
5688 #endif
5689 	SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5690 	    "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5691 	    m->m_pkthdr.len,
5692 	    if_name(m->m_pkthdr.rcvif),
5693 	    (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5694 	mflowid = m->m_pkthdr.flowid;
5695 	mflowtype = M_HASHTYPE_GET(m);
5696 	fibnum = M_GETFIB(m);
5697 	SCTP_STAT_INCR(sctps_recvpackets);
5698 	SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5699 	/* Get IP, SCTP, and first chunk header together in the first mbuf. */
5700 	offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5701 	if (SCTP_BUF_LEN(m) < offset) {
5702 		if ((m = m_pullup(m, offset)) == NULL) {
5703 			SCTP_STAT_INCR(sctps_hdrops);
5704 			return;
5705 		}
5706 	}
5707 	ip = mtod(m, struct ip *);
5708 	sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5709 	ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5710 	offset -= sizeof(struct sctp_chunkhdr);
5711 	memset(&src, 0, sizeof(struct sockaddr_in));
5712 	src.sin_family = AF_INET;
5713 	src.sin_len = sizeof(struct sockaddr_in);
5714 	src.sin_port = sh->src_port;
5715 	src.sin_addr = ip->ip_src;
5716 	memset(&dst, 0, sizeof(struct sockaddr_in));
5717 	dst.sin_family = AF_INET;
5718 	dst.sin_len = sizeof(struct sockaddr_in);
5719 	dst.sin_port = sh->dest_port;
5720 	dst.sin_addr = ip->ip_dst;
5721 	length = ntohs(ip->ip_len);
5722 	/* Validate mbuf chain length with IP payload length. */
5723 	if (SCTP_HEADER_LEN(m) != length) {
5724 		SCTPDBG(SCTP_DEBUG_INPUT1,
5725 		    "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5726 		SCTP_STAT_INCR(sctps_hdrops);
5727 		goto out;
5728 	}
5729 	/* SCTP does not allow broadcasts or multicasts */
5730 	if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5731 		goto out;
5732 	}
5733 	if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5734 		goto out;
5735 	}
5736 	ecn_bits = ip->ip_tos;
5737 	if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5738 		SCTP_STAT_INCR(sctps_recvhwcrc);
5739 		compute_crc = 0;
5740 	} else {
5741 		SCTP_STAT_INCR(sctps_recvswcrc);
5742 		compute_crc = 1;
5743 	}
5744 	sctp_common_input_processing(&m, iphlen, offset, length,
5745 	    (struct sockaddr *)&src,
5746 	    (struct sockaddr *)&dst,
5747 	    sh, ch,
5748 	    compute_crc,
5749 	    ecn_bits,
5750 	    mflowtype, mflowid, fibnum,
5751 	    vrf_id, port);
5752 out:
5753 	if (m) {
5754 		sctp_m_freem(m);
5755 	}
5756 	return;
5757 }
5758 
5759 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5760 extern int *sctp_cpuarry;
5761 #endif
5762 
5763 int
5764 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
5765 {
5766 	struct mbuf *m;
5767 	int off;
5768 
5769 	m = *mp;
5770 	off = *offp;
5771 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5772 	if (mp_ncpus > 1) {
5773 		struct ip *ip;
5774 		struct sctphdr *sh;
5775 		int offset;
5776 		int cpu_to_use;
5777 		uint32_t flowid, tag;
5778 
5779 		if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
5780 			flowid = m->m_pkthdr.flowid;
5781 		} else {
5782 			/*
5783 			 * No flow id built by lower layers fix it so we
5784 			 * create one.
5785 			 */
5786 			offset = off + sizeof(struct sctphdr);
5787 			if (SCTP_BUF_LEN(m) < offset) {
5788 				if ((m = m_pullup(m, offset)) == NULL) {
5789 					SCTP_STAT_INCR(sctps_hdrops);
5790 					return (IPPROTO_DONE);
5791 				}
5792 			}
5793 			ip = mtod(m, struct ip *);
5794 			sh = (struct sctphdr *)((caddr_t)ip + off);
5795 			tag = htonl(sh->v_tag);
5796 			flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5797 			m->m_pkthdr.flowid = flowid;
5798 			M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
5799 		}
5800 		cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5801 		sctp_queue_to_mcore(m, off, cpu_to_use);
5802 		return (IPPROTO_DONE);
5803 	}
5804 #endif
5805 	sctp_input_with_port(m, off, 0);
5806 	return (IPPROTO_DONE);
5807 }
5808 #endif
5809