xref: /freebsd/sys/netinet/sctp_input.c (revision eac7052fdebb90caf2f653e06187bdbca837b9c7)
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 	SCTP_TCB_SEND_LOCK(stcb);
306 	if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
307 		unsigned int newcnt;
308 		struct sctp_stream_out *outs;
309 		struct sctp_stream_queue_pending *sp, *nsp;
310 		struct sctp_tmit_chunk *chk, *nchk;
311 
312 		/* abandon the upper streams */
313 		newcnt = ntohs(init->num_inbound_streams);
314 		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
315 			if (chk->rec.data.sid >= newcnt) {
316 				TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
317 				asoc->send_queue_cnt--;
318 				if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
319 					asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
320 #ifdef INVARIANTS
321 				} else {
322 					panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
323 #endif
324 				}
325 				if (chk->data != NULL) {
326 					sctp_free_bufspace(stcb, asoc, chk, 1);
327 					sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
328 					    0, chk, SCTP_SO_NOT_LOCKED);
329 					if (chk->data) {
330 						sctp_m_freem(chk->data);
331 						chk->data = NULL;
332 					}
333 				}
334 				sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
335 				/* sa_ignore FREED_MEMORY */
336 			}
337 		}
338 		if (asoc->strmout) {
339 			for (i = newcnt; i < asoc->pre_open_streams; i++) {
340 				outs = &asoc->strmout[i];
341 				TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
342 					atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
343 					TAILQ_REMOVE(&outs->outqueue, sp, next);
344 					stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
345 					sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
346 					    stcb, 0, sp, SCTP_SO_NOT_LOCKED);
347 					if (sp->data) {
348 						sctp_m_freem(sp->data);
349 						sp->data = NULL;
350 					}
351 					if (sp->net) {
352 						sctp_free_remote_addr(sp->net);
353 						sp->net = NULL;
354 					}
355 					/* Free the chunk */
356 					sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
357 					/* sa_ignore FREED_MEMORY */
358 				}
359 				outs->state = SCTP_STREAM_CLOSED;
360 			}
361 		}
362 		/* cut back the count */
363 		asoc->pre_open_streams = newcnt;
364 	}
365 	SCTP_TCB_SEND_UNLOCK(stcb);
366 	asoc->streamoutcnt = asoc->pre_open_streams;
367 	if (asoc->strmout) {
368 		for (i = 0; i < asoc->streamoutcnt; i++) {
369 			asoc->strmout[i].state = SCTP_STREAM_OPEN;
370 		}
371 	}
372 	/* EY - nr_sack: initialize highest tsn in nr_mapping_array */
373 	asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
374 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
375 		sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
376 	}
377 	/* This is the next one we expect */
378 	asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
379 
380 	asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
381 	asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
382 
383 	asoc->advanced_peer_ack_point = asoc->last_acked_seq;
384 	/* open the requested streams */
385 
386 	if (asoc->strmin != NULL) {
387 		/* Free the old ones */
388 		for (i = 0; i < asoc->streamincnt; i++) {
389 			sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
390 			sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
391 		}
392 		SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
393 	}
394 	if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
395 		asoc->streamincnt = ntohs(init->num_outbound_streams);
396 	} else {
397 		asoc->streamincnt = asoc->max_inbound_streams;
398 	}
399 	SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
400 	    sizeof(struct sctp_stream_in), SCTP_M_STRMI);
401 	if (asoc->strmin == NULL) {
402 		/* we didn't get memory for the streams! */
403 		SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
404 		return (-1);
405 	}
406 	for (i = 0; i < asoc->streamincnt; i++) {
407 		asoc->strmin[i].sid = i;
408 		asoc->strmin[i].last_mid_delivered = 0xffffffff;
409 		TAILQ_INIT(&asoc->strmin[i].inqueue);
410 		TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
411 		asoc->strmin[i].pd_api_started = 0;
412 		asoc->strmin[i].delivery_started = 0;
413 	}
414 	/*
415 	 * load_address_from_init will put the addresses into the
416 	 * association when the COOKIE is processed or the INIT-ACK is
417 	 * processed. Both types of COOKIE's existing and new call this
418 	 * routine. It will remove addresses that are no longer in the
419 	 * association (for the restarting case where addresses are
420 	 * removed). Up front when the INIT arrives we will discard it if it
421 	 * is a restart and new addresses have been added.
422 	 */
423 	/* sa_ignore MEMLEAK */
424 	return (0);
425 }
426 
427 /*
428  * INIT-ACK message processing/consumption returns value < 0 on error
429  */
430 static int
431 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
432     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
433     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
434     struct sctp_nets *net, int *abort_no_unlock,
435     uint8_t mflowtype, uint32_t mflowid,
436     uint32_t vrf_id)
437 {
438 	struct sctp_association *asoc;
439 	struct mbuf *op_err;
440 	int retval, abort_flag, cookie_found;
441 	int initack_limit;
442 	int nat_friendly = 0;
443 
444 	/* First verify that we have no illegal param's */
445 	abort_flag = 0;
446 	cookie_found = 0;
447 
448 	op_err = sctp_arethere_unrecognized_parameters(m,
449 	    (offset + sizeof(struct sctp_init_chunk)),
450 	    &abort_flag, (struct sctp_chunkhdr *)cp,
451 	    &nat_friendly, &cookie_found);
452 	if (abort_flag) {
453 		/* Send an abort and notify peer */
454 		sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
455 		*abort_no_unlock = 1;
456 		return (-1);
457 	}
458 	if (!cookie_found) {
459 		uint16_t len;
460 
461 		/* Only report the missing cookie parameter */
462 		if (op_err != NULL) {
463 			sctp_m_freem(op_err);
464 		}
465 		len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
466 		/* We abort with an error of missing mandatory param */
467 		op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
468 		if (op_err != NULL) {
469 			struct sctp_error_missing_param *cause;
470 
471 			SCTP_BUF_LEN(op_err) = len;
472 			cause = mtod(op_err, struct sctp_error_missing_param *);
473 			/* Subtract the reserved param */
474 			cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
475 			cause->cause.length = htons(len);
476 			cause->num_missing_params = htonl(1);
477 			cause->type[0] = htons(SCTP_STATE_COOKIE);
478 		}
479 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
480 		    src, dst, sh, op_err,
481 		    mflowtype, mflowid,
482 		    vrf_id, net->port);
483 		*abort_no_unlock = 1;
484 		return (-3);
485 	}
486 	asoc = &stcb->asoc;
487 	asoc->peer_supports_nat = (uint8_t)nat_friendly;
488 	/* process the peer's parameters in the INIT-ACK */
489 	retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
490 	if (retval < 0) {
491 		if (op_err != NULL) {
492 			sctp_m_freem(op_err);
493 		}
494 		return (retval);
495 	}
496 	initack_limit = offset + ntohs(cp->ch.chunk_length);
497 	/* load all addresses */
498 	if ((retval = sctp_load_addresses_from_init(stcb, m,
499 	    (offset + sizeof(struct sctp_init_chunk)), initack_limit,
500 	    src, dst, NULL, stcb->asoc.port))) {
501 		if (op_err != NULL) {
502 			sctp_m_freem(op_err);
503 		}
504 		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
505 		    "Problem with address parameters");
506 		SCTPDBG(SCTP_DEBUG_INPUT1,
507 		    "Load addresses from INIT causes an abort %d\n",
508 		    retval);
509 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
510 		    src, dst, sh, op_err,
511 		    mflowtype, mflowid,
512 		    vrf_id, net->port);
513 		*abort_no_unlock = 1;
514 		return (-1);
515 	}
516 	/* if the peer doesn't support asconf, flush the asconf queue */
517 	if (asoc->asconf_supported == 0) {
518 		struct sctp_asconf_addr *param, *nparam;
519 
520 		TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
521 			TAILQ_REMOVE(&asoc->asconf_queue, param, next);
522 			SCTP_FREE(param, SCTP_M_ASC_ADDR);
523 		}
524 	}
525 
526 	stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
527 	    stcb->asoc.local_hmacs);
528 	if (op_err) {
529 		sctp_queue_op_err(stcb, op_err);
530 		/* queuing will steal away the mbuf chain to the out queue */
531 		op_err = NULL;
532 	}
533 	/* extract the cookie and queue it to "echo" it back... */
534 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
535 		sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
536 		    stcb->asoc.overall_error_count,
537 		    0,
538 		    SCTP_FROM_SCTP_INPUT,
539 		    __LINE__);
540 	}
541 	stcb->asoc.overall_error_count = 0;
542 	net->error_count = 0;
543 
544 	/*
545 	 * Cancel the INIT timer, We do this first before queueing the
546 	 * cookie. We always cancel at the primary to assue that we are
547 	 * canceling the timer started by the INIT which always goes to the
548 	 * primary.
549 	 */
550 	sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
551 	    asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
552 
553 	/* calculate the RTO */
554 	sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
555 	    SCTP_RTT_FROM_NON_DATA);
556 	retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
557 	return (retval);
558 }
559 
560 static void
561 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
562     struct sctp_tcb *stcb, struct sctp_nets *net)
563 {
564 	union sctp_sockstore store;
565 	struct sctp_nets *r_net, *f_net;
566 	struct timeval tv;
567 	int req_prim = 0;
568 	uint16_t old_error_counter;
569 
570 	if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
571 		/* Invalid length */
572 		return;
573 	}
574 
575 	memset(&store, 0, sizeof(store));
576 	switch (cp->heartbeat.hb_info.addr_family) {
577 #ifdef INET
578 	case AF_INET:
579 		if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
580 			store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
581 			store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
582 			store.sin.sin_port = stcb->rport;
583 			memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
584 			    sizeof(store.sin.sin_addr));
585 		} else {
586 			return;
587 		}
588 		break;
589 #endif
590 #ifdef INET6
591 	case AF_INET6:
592 		if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
593 			store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
594 			store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
595 			store.sin6.sin6_port = stcb->rport;
596 			memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
597 		} else {
598 			return;
599 		}
600 		break;
601 #endif
602 	default:
603 		return;
604 	}
605 	r_net = sctp_findnet(stcb, &store.sa);
606 	if (r_net == NULL) {
607 		SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
608 		return;
609 	}
610 	if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
611 	    (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
612 	    (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
613 		/*
614 		 * If the its a HB and it's random value is correct when can
615 		 * confirm the destination.
616 		 */
617 		r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
618 		if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
619 			stcb->asoc.primary_destination = r_net;
620 			r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
621 			f_net = TAILQ_FIRST(&stcb->asoc.nets);
622 			if (f_net != r_net) {
623 				/*
624 				 * first one on the list is NOT the primary
625 				 * sctp_cmpaddr() is much more efficient if
626 				 * the primary is the first on the list,
627 				 * make it so.
628 				 */
629 				TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
630 				TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
631 			}
632 			req_prim = 1;
633 		}
634 		sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
635 		    stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
636 		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
637 		    r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
638 		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
639 	}
640 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
641 		sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
642 		    stcb->asoc.overall_error_count,
643 		    0,
644 		    SCTP_FROM_SCTP_INPUT,
645 		    __LINE__);
646 	}
647 	stcb->asoc.overall_error_count = 0;
648 	old_error_counter = r_net->error_count;
649 	r_net->error_count = 0;
650 	r_net->hb_responded = 1;
651 	tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
652 	tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
653 	/* Now lets do a RTO with this */
654 	sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
655 	    SCTP_RTT_FROM_NON_DATA);
656 	if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
657 		r_net->dest_state |= SCTP_ADDR_REACHABLE;
658 		sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
659 		    0, (void *)r_net, SCTP_SO_NOT_LOCKED);
660 	}
661 	if (r_net->dest_state & SCTP_ADDR_PF) {
662 		r_net->dest_state &= ~SCTP_ADDR_PF;
663 		stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
664 	}
665 	if (old_error_counter > 0) {
666 		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
667 		    stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
668 		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
669 	}
670 	if (r_net == stcb->asoc.primary_destination) {
671 		if (stcb->asoc.alternate) {
672 			/* release the alternate, primary is good */
673 			sctp_free_remote_addr(stcb->asoc.alternate);
674 			stcb->asoc.alternate = NULL;
675 		}
676 	}
677 	/* Mobility adaptation */
678 	if (req_prim) {
679 		if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
680 		    SCTP_MOBILITY_BASE) ||
681 		    sctp_is_mobility_feature_on(stcb->sctp_ep,
682 		    SCTP_MOBILITY_FASTHANDOFF)) &&
683 		    sctp_is_mobility_feature_on(stcb->sctp_ep,
684 		    SCTP_MOBILITY_PRIM_DELETED)) {
685 			sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
686 			    stcb->sctp_ep, stcb, NULL,
687 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
688 			if (sctp_is_mobility_feature_on(stcb->sctp_ep,
689 			    SCTP_MOBILITY_FASTHANDOFF)) {
690 				sctp_assoc_immediate_retrans(stcb,
691 				    stcb->asoc.primary_destination);
692 			}
693 			if (sctp_is_mobility_feature_on(stcb->sctp_ep,
694 			    SCTP_MOBILITY_BASE)) {
695 				sctp_move_chunks_from_net(stcb,
696 				    stcb->asoc.deleted_primary);
697 			}
698 			sctp_delete_prim_timer(stcb->sctp_ep, stcb);
699 		}
700 	}
701 }
702 
703 static int
704 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
705 {
706 	/*
707 	 * Return 0 means we want you to proceed with the abort non-zero
708 	 * means no abort processing.
709 	 */
710 	uint32_t new_vtag;
711 	struct sctpasochead *head;
712 
713 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
714 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
715 		new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
716 		atomic_add_int(&stcb->asoc.refcnt, 1);
717 		SCTP_TCB_UNLOCK(stcb);
718 		SCTP_INP_INFO_WLOCK();
719 		SCTP_TCB_LOCK(stcb);
720 		atomic_subtract_int(&stcb->asoc.refcnt, 1);
721 	} else {
722 		return (0);
723 	}
724 	if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
725 		/* generate a new vtag and send init */
726 		LIST_REMOVE(stcb, sctp_asocs);
727 		stcb->asoc.my_vtag = new_vtag;
728 		head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
729 		/*
730 		 * put it in the bucket in the vtag hash of assoc's for the
731 		 * system
732 		 */
733 		LIST_INSERT_HEAD(head, stcb, sctp_asocs);
734 		SCTP_INP_INFO_WUNLOCK();
735 		sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
736 		return (1);
737 	} else {
738 		/*
739 		 * treat like a case where the cookie expired i.e.: - dump
740 		 * current cookie. - generate a new vtag. - resend init.
741 		 */
742 		/* generate a new vtag and send init */
743 		LIST_REMOVE(stcb, sctp_asocs);
744 		SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
745 		sctp_stop_all_cookie_timers(stcb);
746 		sctp_toss_old_cookies(stcb, &stcb->asoc);
747 		stcb->asoc.my_vtag = new_vtag;
748 		head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
749 		/*
750 		 * put it in the bucket in the vtag hash of assoc's for the
751 		 * system
752 		 */
753 		LIST_INSERT_HEAD(head, stcb, sctp_asocs);
754 		SCTP_INP_INFO_WUNLOCK();
755 		sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
756 		return (1);
757 	}
758 	return (0);
759 }
760 
761 static int
762 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
763     struct sctp_nets *net)
764 {
765 	/*
766 	 * return 0 means we want you to proceed with the abort non-zero
767 	 * means no abort processing
768 	 */
769 	if (stcb->asoc.auth_supported == 0) {
770 		SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
771 		return (0);
772 	}
773 	sctp_asconf_send_nat_state_update(stcb, net);
774 	return (1);
775 }
776 
777 /* Returns 1 if the stcb was aborted, 0 otherwise */
778 static int
779 sctp_handle_abort(struct sctp_abort_chunk *abort,
780     struct sctp_tcb *stcb, struct sctp_nets *net)
781 {
782 	uint16_t len;
783 	uint16_t error;
784 
785 	SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
786 	if (stcb == NULL)
787 		return (0);
788 
789 	len = ntohs(abort->ch.chunk_length);
790 	if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
791 		/*
792 		 * Need to check the cause codes for our two magic nat
793 		 * aborts which don't kill the assoc necessarily.
794 		 */
795 		struct sctp_error_cause *cause;
796 
797 		cause = (struct sctp_error_cause *)(abort + 1);
798 		error = ntohs(cause->code);
799 		if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
800 			SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n",
801 			    abort->ch.chunk_flags);
802 			if (sctp_handle_nat_colliding_state(stcb)) {
803 				return (0);
804 			}
805 		} else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
806 			SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n",
807 			    abort->ch.chunk_flags);
808 			if (sctp_handle_nat_missing_state(stcb, net)) {
809 				return (0);
810 			}
811 		}
812 	} else {
813 		error = 0;
814 	}
815 	/* stop any receive timers */
816 	sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
817 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
818 	/* notify user of the abort and clean up... */
819 	sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
820 	/* free the tcb */
821 	SCTP_STAT_INCR_COUNTER32(sctps_aborted);
822 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
823 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
824 		SCTP_STAT_DECR_GAUGE32(sctps_currestab);
825 	}
826 #ifdef SCTP_ASOCLOG_OF_TSNS
827 	sctp_print_out_track_log(stcb);
828 #endif
829 	(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
830 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
831 	SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
832 	return (1);
833 }
834 
835 static void
836 sctp_start_net_timers(struct sctp_tcb *stcb)
837 {
838 	uint32_t cnt_hb_sent;
839 	struct sctp_nets *net;
840 
841 	cnt_hb_sent = 0;
842 	TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
843 		/*
844 		 * For each network start: 1) A pmtu timer. 2) A HB timer 3)
845 		 * If the dest in unconfirmed send a hb as well if under
846 		 * max_hb_burst have been sent.
847 		 */
848 		sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
849 		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
850 		if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
851 		    (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
852 			sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
853 			cnt_hb_sent++;
854 		}
855 	}
856 	if (cnt_hb_sent) {
857 		sctp_chunk_output(stcb->sctp_ep, stcb,
858 		    SCTP_OUTPUT_FROM_COOKIE_ACK,
859 		    SCTP_SO_NOT_LOCKED);
860 	}
861 }
862 
863 static void
864 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
865     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
866 {
867 	struct sctp_association *asoc;
868 	int some_on_streamwheel;
869 	int old_state;
870 
871 	SCTPDBG(SCTP_DEBUG_INPUT2,
872 	    "sctp_handle_shutdown: handling SHUTDOWN\n");
873 	if (stcb == NULL)
874 		return;
875 	asoc = &stcb->asoc;
876 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
877 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
878 		return;
879 	}
880 	if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
881 		/* Shutdown NOT the expected size */
882 		return;
883 	}
884 	old_state = SCTP_GET_STATE(stcb);
885 	sctp_update_acked(stcb, cp, abort_flag);
886 	if (*abort_flag) {
887 		return;
888 	}
889 	if (asoc->control_pdapi) {
890 		/*
891 		 * With a normal shutdown we assume the end of last record.
892 		 */
893 		SCTP_INP_READ_LOCK(stcb->sctp_ep);
894 		if (asoc->control_pdapi->on_strm_q) {
895 			struct sctp_stream_in *strm;
896 
897 			strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
898 			if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
899 				/* Unordered */
900 				TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
901 				asoc->control_pdapi->on_strm_q = 0;
902 			} else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
903 				/* Ordered */
904 				TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
905 				asoc->control_pdapi->on_strm_q = 0;
906 #ifdef INVARIANTS
907 			} else {
908 				panic("Unknown state on ctrl:%p on_strm_q:%d",
909 				    asoc->control_pdapi,
910 				    asoc->control_pdapi->on_strm_q);
911 #endif
912 			}
913 		}
914 		asoc->control_pdapi->end_added = 1;
915 		asoc->control_pdapi->pdapi_aborted = 1;
916 		asoc->control_pdapi = NULL;
917 		SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
918 		if (stcb->sctp_socket) {
919 			sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
920 		}
921 	}
922 	/* goto SHUTDOWN_RECEIVED state to block new requests */
923 	if (stcb->sctp_socket) {
924 		if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
925 		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
926 		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
927 			SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
928 			/*
929 			 * notify upper layer that peer has initiated a
930 			 * shutdown
931 			 */
932 			sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
933 
934 			/* reset time */
935 			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
936 		}
937 	}
938 	if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
939 		/*
940 		 * stop the shutdown timer, since we WILL move to
941 		 * SHUTDOWN-ACK-SENT.
942 		 */
943 		sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
944 		    net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
945 	}
946 	/* Now is there unsent data on a stream somewhere? */
947 	some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
948 
949 	if (!TAILQ_EMPTY(&asoc->send_queue) ||
950 	    !TAILQ_EMPTY(&asoc->sent_queue) ||
951 	    some_on_streamwheel) {
952 		/* By returning we will push more data out */
953 		return;
954 	} else {
955 		/* no outstanding data to send, so move on... */
956 		/* send SHUTDOWN-ACK */
957 		/* move to SHUTDOWN-ACK-SENT state */
958 		if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
959 		    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
960 			SCTP_STAT_DECR_GAUGE32(sctps_currestab);
961 		}
962 		if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
963 			SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
964 			sctp_stop_timers_for_shutdown(stcb);
965 			sctp_send_shutdown_ack(stcb, net);
966 			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
967 			    stcb->sctp_ep, stcb, net);
968 		} else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
969 			sctp_send_shutdown_ack(stcb, net);
970 		}
971 	}
972 }
973 
974 static void
975 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
976     struct sctp_tcb *stcb,
977     struct sctp_nets *net)
978 {
979 	struct sctp_association *asoc;
980 
981 	SCTPDBG(SCTP_DEBUG_INPUT2,
982 	    "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
983 	if (stcb == NULL)
984 		return;
985 
986 	asoc = &stcb->asoc;
987 	/* process according to association state */
988 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
989 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
990 		/* unexpected SHUTDOWN-ACK... do OOTB handling... */
991 		sctp_send_shutdown_complete(stcb, net, 1);
992 		SCTP_TCB_UNLOCK(stcb);
993 		return;
994 	}
995 	if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
996 	    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
997 		/* unexpected SHUTDOWN-ACK... so ignore... */
998 		SCTP_TCB_UNLOCK(stcb);
999 		return;
1000 	}
1001 	if (asoc->control_pdapi) {
1002 		/*
1003 		 * With a normal shutdown we assume the end of last record.
1004 		 */
1005 		SCTP_INP_READ_LOCK(stcb->sctp_ep);
1006 		asoc->control_pdapi->end_added = 1;
1007 		asoc->control_pdapi->pdapi_aborted = 1;
1008 		asoc->control_pdapi = NULL;
1009 		SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1010 		sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1011 	}
1012 #ifdef INVARIANTS
1013 	if (!TAILQ_EMPTY(&asoc->send_queue) ||
1014 	    !TAILQ_EMPTY(&asoc->sent_queue) ||
1015 	    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
1016 		panic("Queues are not empty when handling SHUTDOWN-ACK");
1017 	}
1018 #endif
1019 	/* stop the timer */
1020 	sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1021 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1022 	/* send SHUTDOWN-COMPLETE */
1023 	sctp_send_shutdown_complete(stcb, net, 0);
1024 	/* notify upper layer protocol */
1025 	if (stcb->sctp_socket) {
1026 		if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1027 		    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1028 			stcb->sctp_socket->so_snd.sb_cc = 0;
1029 		}
1030 		sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1031 	}
1032 	SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1033 	/* free the TCB but first save off the ep */
1034 	(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1035 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1036 }
1037 
1038 static void
1039 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
1040 {
1041 	switch (chunk_type) {
1042 	case SCTP_ASCONF_ACK:
1043 	case SCTP_ASCONF:
1044 		sctp_asconf_cleanup(stcb);
1045 		break;
1046 	case SCTP_IFORWARD_CUM_TSN:
1047 	case SCTP_FORWARD_CUM_TSN:
1048 		stcb->asoc.prsctp_supported = 0;
1049 		break;
1050 	default:
1051 		SCTPDBG(SCTP_DEBUG_INPUT2,
1052 		    "Peer does not support chunk type %d (0x%x).\n",
1053 		    chunk_type, chunk_type);
1054 		break;
1055 	}
1056 }
1057 
1058 /*
1059  * Skip past the param header and then we will find the param that caused the
1060  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1061  * these will turn of specific features.
1062  * XXX: Is this the right thing to do?
1063  */
1064 static void
1065 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1066 {
1067 	switch (parameter_type) {
1068 		/* pr-sctp draft */
1069 	case SCTP_PRSCTP_SUPPORTED:
1070 		stcb->asoc.prsctp_supported = 0;
1071 		break;
1072 	case SCTP_SUPPORTED_CHUNK_EXT:
1073 		break;
1074 		/* draft-ietf-tsvwg-addip-sctp */
1075 	case SCTP_HAS_NAT_SUPPORT:
1076 		stcb->asoc.peer_supports_nat = 0;
1077 		break;
1078 	case SCTP_ADD_IP_ADDRESS:
1079 	case SCTP_DEL_IP_ADDRESS:
1080 	case SCTP_SET_PRIM_ADDR:
1081 		stcb->asoc.asconf_supported = 0;
1082 		break;
1083 	case SCTP_SUCCESS_REPORT:
1084 	case SCTP_ERROR_CAUSE_IND:
1085 		SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1086 		SCTPDBG(SCTP_DEBUG_INPUT2,
1087 		    "Turning off ASCONF to this strange peer\n");
1088 		stcb->asoc.asconf_supported = 0;
1089 		break;
1090 	default:
1091 		SCTPDBG(SCTP_DEBUG_INPUT2,
1092 		    "Peer does not support param type %d (0x%x)??\n",
1093 		    parameter_type, parameter_type);
1094 		break;
1095 	}
1096 }
1097 
1098 static int
1099 sctp_handle_error(struct sctp_chunkhdr *ch,
1100     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1101 {
1102 	struct sctp_error_cause *cause;
1103 	struct sctp_association *asoc;
1104 	uint32_t remaining_length, adjust;
1105 	uint16_t code, cause_code, cause_length;
1106 
1107 	/* parse through all of the errors and process */
1108 	asoc = &stcb->asoc;
1109 	cause = (struct sctp_error_cause *)((caddr_t)ch +
1110 	    sizeof(struct sctp_chunkhdr));
1111 	remaining_length = ntohs(ch->chunk_length);
1112 	if (remaining_length > limit) {
1113 		remaining_length = limit;
1114 	}
1115 	if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1116 		remaining_length -= sizeof(struct sctp_chunkhdr);
1117 	} else {
1118 		remaining_length = 0;
1119 	}
1120 	code = 0;
1121 	while (remaining_length >= sizeof(struct sctp_error_cause)) {
1122 		/* Process an Error Cause */
1123 		cause_code = ntohs(cause->code);
1124 		cause_length = ntohs(cause->length);
1125 		if ((cause_length > remaining_length) || (cause_length == 0)) {
1126 			/* Invalid cause length, possibly due to truncation. */
1127 			SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1128 			    remaining_length, cause_length);
1129 			return (0);
1130 		}
1131 		if (code == 0) {
1132 			/* report the first error cause */
1133 			code = cause_code;
1134 		}
1135 		switch (cause_code) {
1136 		case SCTP_CAUSE_INVALID_STREAM:
1137 		case SCTP_CAUSE_MISSING_PARAM:
1138 		case SCTP_CAUSE_INVALID_PARAM:
1139 		case SCTP_CAUSE_NO_USER_DATA:
1140 			SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1141 			    cause_code);
1142 			break;
1143 		case SCTP_CAUSE_NAT_COLLIDING_STATE:
1144 			SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n",
1145 			    ch->chunk_flags);
1146 			if (sctp_handle_nat_colliding_state(stcb)) {
1147 				return (0);
1148 			}
1149 			break;
1150 		case SCTP_CAUSE_NAT_MISSING_STATE:
1151 			SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n",
1152 			    ch->chunk_flags);
1153 			if (sctp_handle_nat_missing_state(stcb, net)) {
1154 				return (0);
1155 			}
1156 			break;
1157 		case SCTP_CAUSE_STALE_COOKIE:
1158 			/*
1159 			 * We only act if we have echoed a cookie and are
1160 			 * waiting.
1161 			 */
1162 			if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1163 			    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1164 				struct sctp_error_stale_cookie *stale_cookie;
1165 
1166 				stale_cookie = (struct sctp_error_stale_cookie *)cause;
1167 				asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time);
1168 				/* Double it to be more robust on RTX */
1169 				if (asoc->cookie_preserve_req <= UINT32_MAX / 2) {
1170 					asoc->cookie_preserve_req *= 2;
1171 				} else {
1172 					asoc->cookie_preserve_req = UINT32_MAX;
1173 				}
1174 				asoc->stale_cookie_count++;
1175 				if (asoc->stale_cookie_count >
1176 				    asoc->max_init_times) {
1177 					sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1178 					/* now free the asoc */
1179 					(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1180 					    SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1181 					return (-1);
1182 				}
1183 				/* blast back to INIT state */
1184 				sctp_toss_old_cookies(stcb, &stcb->asoc);
1185 				SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1186 				sctp_stop_all_cookie_timers(stcb);
1187 				sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1188 			}
1189 			break;
1190 		case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1191 			/*
1192 			 * Nothing we can do here, we don't do hostname
1193 			 * addresses so if the peer does not like my IPv6
1194 			 * (or IPv4 for that matter) it does not matter. If
1195 			 * they don't support that type of address, they can
1196 			 * NOT possibly get that packet type... i.e. with no
1197 			 * IPv6 you can't receive a IPv6 packet. so we can
1198 			 * safely ignore this one. If we ever added support
1199 			 * for HOSTNAME Addresses, then we would need to do
1200 			 * something here.
1201 			 */
1202 			break;
1203 		case SCTP_CAUSE_UNRECOG_CHUNK:
1204 			if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1205 				struct sctp_error_unrecognized_chunk *unrec_chunk;
1206 
1207 				unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1208 				sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
1209 			}
1210 			break;
1211 		case SCTP_CAUSE_UNRECOG_PARAM:
1212 			/* XXX: We only consider the first parameter */
1213 			if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1214 				struct sctp_paramhdr *unrec_parameter;
1215 
1216 				unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1217 				sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1218 			}
1219 			break;
1220 		case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1221 			/*
1222 			 * We ignore this since the timer will drive out a
1223 			 * new cookie anyway and there timer will drive us
1224 			 * to send a SHUTDOWN_COMPLETE. We can't send one
1225 			 * here since we don't have their tag.
1226 			 */
1227 			break;
1228 		case SCTP_CAUSE_DELETING_LAST_ADDR:
1229 		case SCTP_CAUSE_RESOURCE_SHORTAGE:
1230 		case SCTP_CAUSE_DELETING_SRC_ADDR:
1231 			/*
1232 			 * We should NOT get these here, but in a
1233 			 * ASCONF-ACK.
1234 			 */
1235 			SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1236 			    cause_code);
1237 			break;
1238 		case SCTP_CAUSE_OUT_OF_RESC:
1239 			/*
1240 			 * And what, pray tell do we do with the fact that
1241 			 * the peer is out of resources? Not really sure we
1242 			 * could do anything but abort. I suspect this
1243 			 * should have came WITH an abort instead of in a
1244 			 * OP-ERROR.
1245 			 */
1246 			break;
1247 		default:
1248 			SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1249 			    cause_code);
1250 			break;
1251 		}
1252 		adjust = SCTP_SIZE32(cause_length);
1253 		if (remaining_length >= adjust) {
1254 			remaining_length -= adjust;
1255 		} else {
1256 			remaining_length = 0;
1257 		}
1258 		cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1259 	}
1260 	sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1261 	return (0);
1262 }
1263 
1264 static int
1265 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1266     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1267     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1268     struct sctp_nets *net, int *abort_no_unlock,
1269     uint8_t mflowtype, uint32_t mflowid,
1270     uint32_t vrf_id)
1271 {
1272 	struct sctp_init_ack *init_ack;
1273 	struct mbuf *op_err;
1274 
1275 	SCTPDBG(SCTP_DEBUG_INPUT2,
1276 	    "sctp_handle_init_ack: handling INIT-ACK\n");
1277 
1278 	if (stcb == NULL) {
1279 		SCTPDBG(SCTP_DEBUG_INPUT2,
1280 		    "sctp_handle_init_ack: TCB is null\n");
1281 		return (-1);
1282 	}
1283 	if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1284 		/* Invalid length */
1285 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1286 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1287 		    src, dst, sh, op_err,
1288 		    mflowtype, mflowid,
1289 		    vrf_id, net->port);
1290 		*abort_no_unlock = 1;
1291 		return (-1);
1292 	}
1293 	init_ack = &cp->init;
1294 	/* validate parameters */
1295 	if (init_ack->initiate_tag == 0) {
1296 		/* protocol error... send an abort */
1297 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1298 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1299 		    src, dst, sh, op_err,
1300 		    mflowtype, mflowid,
1301 		    vrf_id, net->port);
1302 		*abort_no_unlock = 1;
1303 		return (-1);
1304 	}
1305 	if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1306 		/* protocol error... send an abort */
1307 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1308 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1309 		    src, dst, sh, op_err,
1310 		    mflowtype, mflowid,
1311 		    vrf_id, net->port);
1312 		*abort_no_unlock = 1;
1313 		return (-1);
1314 	}
1315 	if (init_ack->num_inbound_streams == 0) {
1316 		/* protocol error... send an abort */
1317 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1318 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1319 		    src, dst, sh, op_err,
1320 		    mflowtype, mflowid,
1321 		    vrf_id, net->port);
1322 		*abort_no_unlock = 1;
1323 		return (-1);
1324 	}
1325 	if (init_ack->num_outbound_streams == 0) {
1326 		/* protocol error... send an abort */
1327 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1328 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1329 		    src, dst, sh, op_err,
1330 		    mflowtype, mflowid,
1331 		    vrf_id, net->port);
1332 		*abort_no_unlock = 1;
1333 		return (-1);
1334 	}
1335 	/* process according to association state... */
1336 	switch (SCTP_GET_STATE(stcb)) {
1337 	case SCTP_STATE_COOKIE_WAIT:
1338 		/* this is the expected state for this chunk */
1339 		/* process the INIT-ACK parameters */
1340 		if (stcb->asoc.primary_destination->dest_state &
1341 		    SCTP_ADDR_UNCONFIRMED) {
1342 			/*
1343 			 * The primary is where we sent the INIT, we can
1344 			 * always consider it confirmed when the INIT-ACK is
1345 			 * returned. Do this before we load addresses
1346 			 * though.
1347 			 */
1348 			stcb->asoc.primary_destination->dest_state &=
1349 			    ~SCTP_ADDR_UNCONFIRMED;
1350 			sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1351 			    stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1352 		}
1353 		if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1354 		    net, abort_no_unlock,
1355 		    mflowtype, mflowid,
1356 		    vrf_id) < 0) {
1357 			/* error in parsing parameters */
1358 			return (-1);
1359 		}
1360 		/* update our state */
1361 		SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1362 		SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1363 
1364 		/* reset the RTO calc */
1365 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1366 			sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1367 			    stcb->asoc.overall_error_count,
1368 			    0,
1369 			    SCTP_FROM_SCTP_INPUT,
1370 			    __LINE__);
1371 		}
1372 		stcb->asoc.overall_error_count = 0;
1373 		(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1374 		/*
1375 		 * collapse the init timer back in case of a exponential
1376 		 * backoff
1377 		 */
1378 		sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1379 		    stcb, net);
1380 		/*
1381 		 * the send at the end of the inbound data processing will
1382 		 * cause the cookie to be sent
1383 		 */
1384 		break;
1385 	case SCTP_STATE_SHUTDOWN_SENT:
1386 		/* incorrect state... discard */
1387 		break;
1388 	case SCTP_STATE_COOKIE_ECHOED:
1389 		/* incorrect state... discard */
1390 		break;
1391 	case SCTP_STATE_OPEN:
1392 		/* incorrect state... discard */
1393 		break;
1394 	case SCTP_STATE_EMPTY:
1395 	case SCTP_STATE_INUSE:
1396 	default:
1397 		/* incorrect state... discard */
1398 		return (-1);
1399 		break;
1400 	}
1401 	SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1402 	return (0);
1403 }
1404 
1405 static struct sctp_tcb *
1406 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1407     struct sockaddr *src, struct sockaddr *dst,
1408     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1409     struct sctp_inpcb *inp, struct sctp_nets **netp,
1410     struct sockaddr *init_src, int *notification,
1411     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1412     uint8_t mflowtype, uint32_t mflowid,
1413     uint32_t vrf_id, uint16_t port);
1414 
1415 /*
1416  * handle a state cookie for an existing association m: input packet mbuf
1417  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1418  * "split" mbuf and the cookie signature does not exist offset: offset into
1419  * mbuf to the cookie-echo chunk
1420  */
1421 static struct sctp_tcb *
1422 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1423     struct sockaddr *src, struct sockaddr *dst,
1424     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1425     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1426     struct sockaddr *init_src, int *notification,
1427     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1428     uint8_t mflowtype, uint32_t mflowid,
1429     uint32_t vrf_id, uint16_t port)
1430 {
1431 	struct sctp_association *asoc;
1432 	struct sctp_init_chunk *init_cp, init_buf;
1433 	struct sctp_init_ack_chunk *initack_cp, initack_buf;
1434 	struct sctp_nets *net;
1435 	struct mbuf *op_err;
1436 	struct timeval old;
1437 	int init_offset, initack_offset, i;
1438 	int retval;
1439 	int spec_flag = 0;
1440 	uint32_t how_indx;
1441 #if defined(SCTP_DETAILED_STR_STATS)
1442 	int j;
1443 #endif
1444 
1445 	net = *netp;
1446 	/* I know that the TCB is non-NULL from the caller */
1447 	asoc = &stcb->asoc;
1448 	for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1449 		if (asoc->cookie_how[how_indx] == 0)
1450 			break;
1451 	}
1452 	if (how_indx < sizeof(asoc->cookie_how)) {
1453 		asoc->cookie_how[how_indx] = 1;
1454 	}
1455 	if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1456 		/* SHUTDOWN came in after sending INIT-ACK */
1457 		sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1458 		op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1459 		sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1460 		    mflowtype, mflowid, inp->fibnum,
1461 		    vrf_id, net->port);
1462 		if (how_indx < sizeof(asoc->cookie_how))
1463 			asoc->cookie_how[how_indx] = 2;
1464 		return (NULL);
1465 	}
1466 	/*
1467 	 * find and validate the INIT chunk in the cookie (peer's info) the
1468 	 * INIT should start after the cookie-echo header struct (chunk
1469 	 * header, state cookie header struct)
1470 	 */
1471 	init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1472 
1473 	init_cp = (struct sctp_init_chunk *)
1474 	    sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1475 	    (uint8_t *)&init_buf);
1476 	if (init_cp == NULL) {
1477 		/* could not pull a INIT chunk in cookie */
1478 		return (NULL);
1479 	}
1480 	if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1481 		return (NULL);
1482 	}
1483 	/*
1484 	 * find and validate the INIT-ACK chunk in the cookie (my info) the
1485 	 * INIT-ACK follows the INIT chunk
1486 	 */
1487 	initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1488 	initack_cp = (struct sctp_init_ack_chunk *)
1489 	    sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1490 	    (uint8_t *)&initack_buf);
1491 	if (initack_cp == NULL) {
1492 		/* could not pull INIT-ACK chunk in cookie */
1493 		return (NULL);
1494 	}
1495 	if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1496 		return (NULL);
1497 	}
1498 	if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1499 	    (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1500 		/*
1501 		 * case D in Section 5.2.4 Table 2: MMAA process accordingly
1502 		 * to get into the OPEN state
1503 		 */
1504 		if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1505 			/*-
1506 			 * Opps, this means that we somehow generated two vtag's
1507 			 * the same. I.e. we did:
1508 			 *  Us               Peer
1509 			 *   <---INIT(tag=a)------
1510 			 *   ----INIT-ACK(tag=t)-->
1511 			 *   ----INIT(tag=t)------> *1
1512 			 *   <---INIT-ACK(tag=a)---
1513                          *   <----CE(tag=t)------------- *2
1514 			 *
1515 			 * At point *1 we should be generating a different
1516 			 * tag t'. Which means we would throw away the CE and send
1517 			 * ours instead. Basically this is case C (throw away side).
1518 			 */
1519 			if (how_indx < sizeof(asoc->cookie_how))
1520 				asoc->cookie_how[how_indx] = 17;
1521 			return (NULL);
1522 		}
1523 		switch (SCTP_GET_STATE(stcb)) {
1524 		case SCTP_STATE_COOKIE_WAIT:
1525 		case SCTP_STATE_COOKIE_ECHOED:
1526 			/*
1527 			 * INIT was sent but got a COOKIE_ECHO with the
1528 			 * correct tags... just accept it...but we must
1529 			 * process the init so that we can make sure we have
1530 			 * the right seq no's.
1531 			 */
1532 			/* First we must process the INIT !! */
1533 			retval = sctp_process_init(init_cp, stcb);
1534 			if (retval < 0) {
1535 				if (how_indx < sizeof(asoc->cookie_how))
1536 					asoc->cookie_how[how_indx] = 3;
1537 				return (NULL);
1538 			}
1539 			/* we have already processed the INIT so no problem */
1540 			sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1541 			    stcb, net,
1542 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1543 			sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1544 			    stcb, net,
1545 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1546 			/* update current state */
1547 			if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1548 				SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1549 			else
1550 				SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1551 
1552 			SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1553 			if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1554 				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1555 				    stcb->sctp_ep, stcb, NULL);
1556 			}
1557 			SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1558 			sctp_stop_all_cookie_timers(stcb);
1559 			if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1560 			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1561 			    (!SCTP_IS_LISTENING(inp))) {
1562 				/*
1563 				 * Here is where collision would go if we
1564 				 * did a connect() and instead got a
1565 				 * init/init-ack/cookie done before the
1566 				 * init-ack came back..
1567 				 */
1568 				stcb->sctp_ep->sctp_flags |=
1569 				    SCTP_PCB_FLAGS_CONNECTED;
1570 				soisconnected(stcb->sctp_socket);
1571 			}
1572 			/* notify upper layer */
1573 			*notification = SCTP_NOTIFY_ASSOC_UP;
1574 			/*
1575 			 * since we did not send a HB make sure we don't
1576 			 * double things
1577 			 */
1578 			old.tv_sec = cookie->time_entered.tv_sec;
1579 			old.tv_usec = cookie->time_entered.tv_usec;
1580 			net->hb_responded = 1;
1581 			sctp_calculate_rto(stcb, asoc, net, &old,
1582 			    SCTP_RTT_FROM_NON_DATA);
1583 
1584 			if (stcb->asoc.sctp_autoclose_ticks &&
1585 			    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1586 				sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1587 				    inp, stcb, NULL);
1588 			}
1589 			break;
1590 		default:
1591 			/*
1592 			 * we're in the OPEN state (or beyond), so peer must
1593 			 * have simply lost the COOKIE-ACK
1594 			 */
1595 			break;
1596 		}		/* end switch */
1597 		sctp_stop_all_cookie_timers(stcb);
1598 		/*
1599 		 * We ignore the return code here.. not sure if we should
1600 		 * somehow abort.. but we do have an existing asoc. This
1601 		 * really should not fail.
1602 		 */
1603 		if (sctp_load_addresses_from_init(stcb, m,
1604 		    init_offset + sizeof(struct sctp_init_chunk),
1605 		    initack_offset, src, dst, init_src, stcb->asoc.port)) {
1606 			if (how_indx < sizeof(asoc->cookie_how))
1607 				asoc->cookie_how[how_indx] = 4;
1608 			return (NULL);
1609 		}
1610 		/* respond with a COOKIE-ACK */
1611 		sctp_toss_old_cookies(stcb, asoc);
1612 		sctp_send_cookie_ack(stcb);
1613 		if (how_indx < sizeof(asoc->cookie_how))
1614 			asoc->cookie_how[how_indx] = 5;
1615 		return (stcb);
1616 	}
1617 
1618 	if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1619 	    ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1620 	    cookie->tie_tag_my_vtag == 0 &&
1621 	    cookie->tie_tag_peer_vtag == 0) {
1622 		/*
1623 		 * case C in Section 5.2.4 Table 2: XMOO silently discard
1624 		 */
1625 		if (how_indx < sizeof(asoc->cookie_how))
1626 			asoc->cookie_how[how_indx] = 6;
1627 		return (NULL);
1628 	}
1629 	/*
1630 	 * If nat support, and the below and stcb is established, send back
1631 	 * a ABORT(colliding state) if we are established.
1632 	 */
1633 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1634 	    (asoc->peer_supports_nat) &&
1635 	    ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1636 	    ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1637 	    (asoc->peer_vtag == 0)))) {
1638 		/*
1639 		 * Special case - Peer's support nat. We may have two init's
1640 		 * that we gave out the same tag on since one was not
1641 		 * established.. i.e. we get INIT from host-1 behind the nat
1642 		 * and we respond tag-a, we get a INIT from host-2 behind
1643 		 * the nat and we get tag-a again. Then we bring up host-1
1644 		 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1645 		 * Now we have colliding state. We must send an abort here
1646 		 * with colliding state indication.
1647 		 */
1648 		op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1649 		sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1650 		    mflowtype, mflowid, inp->fibnum,
1651 		    vrf_id, port);
1652 		return (NULL);
1653 	}
1654 	if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1655 	    ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1656 	    (asoc->peer_vtag == 0))) {
1657 		/*
1658 		 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1659 		 * should be ok, re-accept peer info
1660 		 */
1661 		if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1662 			/*
1663 			 * Extension of case C. If we hit this, then the
1664 			 * random number generator returned the same vtag
1665 			 * when we first sent our INIT-ACK and when we later
1666 			 * sent our INIT. The side with the seq numbers that
1667 			 * are different will be the one that normnally
1668 			 * would have hit case C. This in effect "extends"
1669 			 * our vtags in this collision case to be 64 bits.
1670 			 * The same collision could occur aka you get both
1671 			 * vtag and seq number the same twice in a row.. but
1672 			 * is much less likely. If it did happen then we
1673 			 * would proceed through and bring up the assoc.. we
1674 			 * may end up with the wrong stream setup however..
1675 			 * which would be bad.. but there is no way to
1676 			 * tell.. until we send on a stream that does not
1677 			 * exist :-)
1678 			 */
1679 			if (how_indx < sizeof(asoc->cookie_how))
1680 				asoc->cookie_how[how_indx] = 7;
1681 
1682 			return (NULL);
1683 		}
1684 		if (how_indx < sizeof(asoc->cookie_how))
1685 			asoc->cookie_how[how_indx] = 8;
1686 		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1687 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1688 		sctp_stop_all_cookie_timers(stcb);
1689 		/*
1690 		 * since we did not send a HB make sure we don't double
1691 		 * things
1692 		 */
1693 		net->hb_responded = 1;
1694 		if (stcb->asoc.sctp_autoclose_ticks &&
1695 		    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1696 			sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1697 			    NULL);
1698 		}
1699 		asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1700 		asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1701 
1702 		if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1703 			/*
1704 			 * Ok the peer probably discarded our data (if we
1705 			 * echoed a cookie+data). So anything on the
1706 			 * sent_queue should be marked for retransmit, we
1707 			 * may not get something to kick us so it COULD
1708 			 * still take a timeout to move these.. but it can't
1709 			 * hurt to mark them.
1710 			 */
1711 			struct sctp_tmit_chunk *chk;
1712 
1713 			TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1714 				if (chk->sent < SCTP_DATAGRAM_RESEND) {
1715 					chk->sent = SCTP_DATAGRAM_RESEND;
1716 					sctp_flight_size_decrease(chk);
1717 					sctp_total_flight_decrease(stcb, chk);
1718 					sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1719 					spec_flag++;
1720 				}
1721 			}
1722 		}
1723 		/* process the INIT info (peer's info) */
1724 		retval = sctp_process_init(init_cp, stcb);
1725 		if (retval < 0) {
1726 			if (how_indx < sizeof(asoc->cookie_how))
1727 				asoc->cookie_how[how_indx] = 9;
1728 			return (NULL);
1729 		}
1730 		if (sctp_load_addresses_from_init(stcb, m,
1731 		    init_offset + sizeof(struct sctp_init_chunk),
1732 		    initack_offset, src, dst, init_src, stcb->asoc.port)) {
1733 			if (how_indx < sizeof(asoc->cookie_how))
1734 				asoc->cookie_how[how_indx] = 10;
1735 			return (NULL);
1736 		}
1737 		if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1738 		    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1739 			*notification = SCTP_NOTIFY_ASSOC_UP;
1740 
1741 			if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1742 			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1743 			    (!SCTP_IS_LISTENING(inp))) {
1744 				stcb->sctp_ep->sctp_flags |=
1745 				    SCTP_PCB_FLAGS_CONNECTED;
1746 				soisconnected(stcb->sctp_socket);
1747 			}
1748 			if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1749 				SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1750 			else
1751 				SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1752 			SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1753 		} else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1754 			SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1755 		} else {
1756 			SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1757 		}
1758 		SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1759 		if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1760 			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1761 			    stcb->sctp_ep, stcb, NULL);
1762 		}
1763 		sctp_stop_all_cookie_timers(stcb);
1764 		sctp_toss_old_cookies(stcb, asoc);
1765 		sctp_send_cookie_ack(stcb);
1766 		if (spec_flag) {
1767 			/*
1768 			 * only if we have retrans set do we do this. What
1769 			 * this call does is get only the COOKIE-ACK out and
1770 			 * then when we return the normal call to
1771 			 * sctp_chunk_output will get the retrans out behind
1772 			 * this.
1773 			 */
1774 			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1775 		}
1776 		if (how_indx < sizeof(asoc->cookie_how))
1777 			asoc->cookie_how[how_indx] = 11;
1778 
1779 		return (stcb);
1780 	}
1781 	if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1782 	    ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1783 	    cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1784 	    cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1785 	    cookie->tie_tag_peer_vtag != 0) {
1786 		struct sctpasochead *head;
1787 
1788 		if (asoc->peer_supports_nat) {
1789 			/*
1790 			 * This is a gross gross hack. Just call the
1791 			 * cookie_new code since we are allowing a duplicate
1792 			 * association. I hope this works...
1793 			 */
1794 			return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1795 			    sh, cookie, cookie_len,
1796 			    inp, netp, init_src, notification,
1797 			    auth_skipped, auth_offset, auth_len,
1798 			    mflowtype, mflowid,
1799 			    vrf_id, port));
1800 		}
1801 		/*
1802 		 * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1803 		 */
1804 		/* temp code */
1805 		if (how_indx < sizeof(asoc->cookie_how))
1806 			asoc->cookie_how[how_indx] = 12;
1807 		sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1808 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1809 		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1810 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1811 
1812 		/* notify upper layer */
1813 		*notification = SCTP_NOTIFY_ASSOC_RESTART;
1814 		atomic_add_int(&stcb->asoc.refcnt, 1);
1815 		if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1816 		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1817 		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1818 			SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1819 		}
1820 		if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1821 			SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1822 		} else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1823 			SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1824 		}
1825 		if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1826 			SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1827 			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1828 			    stcb->sctp_ep, stcb, NULL);
1829 
1830 		} else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1831 			/* move to OPEN state, if not in SHUTDOWN_SENT */
1832 			SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1833 		}
1834 		asoc->pre_open_streams =
1835 		    ntohs(initack_cp->init.num_outbound_streams);
1836 		asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1837 		asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1838 		asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1839 
1840 		asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1841 
1842 		asoc->str_reset_seq_in = asoc->init_seq_number;
1843 
1844 		asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1845 		if (asoc->mapping_array) {
1846 			memset(asoc->mapping_array, 0,
1847 			    asoc->mapping_array_size);
1848 		}
1849 		if (asoc->nr_mapping_array) {
1850 			memset(asoc->nr_mapping_array, 0,
1851 			    asoc->mapping_array_size);
1852 		}
1853 		SCTP_TCB_UNLOCK(stcb);
1854 		SCTP_INP_INFO_WLOCK();
1855 		SCTP_INP_WLOCK(stcb->sctp_ep);
1856 		SCTP_TCB_LOCK(stcb);
1857 		atomic_add_int(&stcb->asoc.refcnt, -1);
1858 		/* send up all the data */
1859 		SCTP_TCB_SEND_LOCK(stcb);
1860 
1861 		sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
1862 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1863 			stcb->asoc.strmout[i].chunks_on_queues = 0;
1864 #if defined(SCTP_DETAILED_STR_STATS)
1865 			for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1866 				asoc->strmout[i].abandoned_sent[j] = 0;
1867 				asoc->strmout[i].abandoned_unsent[j] = 0;
1868 			}
1869 #else
1870 			asoc->strmout[i].abandoned_sent[0] = 0;
1871 			asoc->strmout[i].abandoned_unsent[0] = 0;
1872 #endif
1873 			stcb->asoc.strmout[i].sid = i;
1874 			stcb->asoc.strmout[i].next_mid_ordered = 0;
1875 			stcb->asoc.strmout[i].next_mid_unordered = 0;
1876 			stcb->asoc.strmout[i].last_msg_incomplete = 0;
1877 		}
1878 		/* process the INIT-ACK info (my info) */
1879 		asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1880 		asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1881 
1882 		/* pull from vtag hash */
1883 		LIST_REMOVE(stcb, sctp_asocs);
1884 		/* re-insert to new vtag position */
1885 		head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1886 		    SCTP_BASE_INFO(hashasocmark))];
1887 		/*
1888 		 * put it in the bucket in the vtag hash of assoc's for the
1889 		 * system
1890 		 */
1891 		LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1892 
1893 		SCTP_TCB_SEND_UNLOCK(stcb);
1894 		SCTP_INP_WUNLOCK(stcb->sctp_ep);
1895 		SCTP_INP_INFO_WUNLOCK();
1896 		asoc->total_flight = 0;
1897 		asoc->total_flight_count = 0;
1898 		/* process the INIT info (peer's info) */
1899 		retval = sctp_process_init(init_cp, stcb);
1900 		if (retval < 0) {
1901 			if (how_indx < sizeof(asoc->cookie_how))
1902 				asoc->cookie_how[how_indx] = 13;
1903 
1904 			return (NULL);
1905 		}
1906 		/*
1907 		 * since we did not send a HB make sure we don't double
1908 		 * things
1909 		 */
1910 		net->hb_responded = 1;
1911 
1912 		if (sctp_load_addresses_from_init(stcb, m,
1913 		    init_offset + sizeof(struct sctp_init_chunk),
1914 		    initack_offset, src, dst, init_src, stcb->asoc.port)) {
1915 			if (how_indx < sizeof(asoc->cookie_how))
1916 				asoc->cookie_how[how_indx] = 14;
1917 
1918 			return (NULL);
1919 		}
1920 		/* respond with a COOKIE-ACK */
1921 		sctp_stop_all_cookie_timers(stcb);
1922 		sctp_toss_old_cookies(stcb, asoc);
1923 		sctp_send_cookie_ack(stcb);
1924 		if (how_indx < sizeof(asoc->cookie_how))
1925 			asoc->cookie_how[how_indx] = 15;
1926 
1927 		return (stcb);
1928 	}
1929 	if (how_indx < sizeof(asoc->cookie_how))
1930 		asoc->cookie_how[how_indx] = 16;
1931 	/* all other cases... */
1932 	return (NULL);
1933 }
1934 
1935 /*
1936  * handle a state cookie for a new association m: input packet mbuf chain--
1937  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1938  * and the cookie signature does not exist offset: offset into mbuf to the
1939  * cookie-echo chunk length: length of the cookie chunk to: where the init
1940  * was from returns a new TCB
1941  */
1942 static struct sctp_tcb *
1943 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1944     struct sockaddr *src, struct sockaddr *dst,
1945     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1946     struct sctp_inpcb *inp, struct sctp_nets **netp,
1947     struct sockaddr *init_src, int *notification,
1948     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1949     uint8_t mflowtype, uint32_t mflowid,
1950     uint32_t vrf_id, uint16_t port)
1951 {
1952 	struct sctp_tcb *stcb;
1953 	struct sctp_init_chunk *init_cp, init_buf;
1954 	struct sctp_init_ack_chunk *initack_cp, initack_buf;
1955 	union sctp_sockstore store;
1956 	struct sctp_association *asoc;
1957 	int init_offset, initack_offset, initack_limit;
1958 	int retval;
1959 	int error = 0;
1960 	uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
1961 
1962 	/*
1963 	 * find and validate the INIT chunk in the cookie (peer's info) the
1964 	 * INIT should start after the cookie-echo header struct (chunk
1965 	 * header, state cookie header struct)
1966 	 */
1967 	init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1968 	init_cp = (struct sctp_init_chunk *)
1969 	    sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1970 	    (uint8_t *)&init_buf);
1971 	if (init_cp == NULL) {
1972 		/* could not pull a INIT chunk in cookie */
1973 		SCTPDBG(SCTP_DEBUG_INPUT1,
1974 		    "process_cookie_new: could not pull INIT chunk hdr\n");
1975 		return (NULL);
1976 	}
1977 	if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1978 		SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
1979 		return (NULL);
1980 	}
1981 	initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1982 	/*
1983 	 * find and validate the INIT-ACK chunk in the cookie (my info) the
1984 	 * INIT-ACK follows the INIT chunk
1985 	 */
1986 	initack_cp = (struct sctp_init_ack_chunk *)
1987 	    sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1988 	    (uint8_t *)&initack_buf);
1989 	if (initack_cp == NULL) {
1990 		/* could not pull INIT-ACK chunk in cookie */
1991 		SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
1992 		return (NULL);
1993 	}
1994 	if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1995 		return (NULL);
1996 	}
1997 	/*
1998 	 * NOTE: We can't use the INIT_ACK's chk_length to determine the
1999 	 * "initack_limit" value.  This is because the chk_length field
2000 	 * includes the length of the cookie, but the cookie is omitted when
2001 	 * the INIT and INIT_ACK are tacked onto the cookie...
2002 	 */
2003 	initack_limit = offset + cookie_len;
2004 
2005 	/*
2006 	 * now that we know the INIT/INIT-ACK are in place, create a new TCB
2007 	 * and popluate
2008 	 */
2009 
2010 	/*
2011 	 * Here we do a trick, we set in NULL for the proc/thread argument.
2012 	 * We do this since in effect we only use the p argument when the
2013 	 * socket is unbound and we must do an implicit bind. Since we are
2014 	 * getting a cookie, we cannot be unbound.
2015 	 */
2016 	stcb = sctp_aloc_assoc(inp, init_src, &error,
2017 	    ntohl(initack_cp->init.initiate_tag), vrf_id,
2018 	    ntohs(initack_cp->init.num_outbound_streams),
2019 	    port,
2020 	    (struct thread *)NULL,
2021 	    SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2022 	if (stcb == NULL) {
2023 		struct mbuf *op_err;
2024 
2025 		/* memory problem? */
2026 		SCTPDBG(SCTP_DEBUG_INPUT1,
2027 		    "process_cookie_new: no room for another TCB!\n");
2028 		op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2029 		sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2030 		    src, dst, sh, op_err,
2031 		    mflowtype, mflowid,
2032 		    vrf_id, port);
2033 		return (NULL);
2034 	}
2035 	/* get the correct sctp_nets */
2036 	if (netp)
2037 		*netp = sctp_findnet(stcb, init_src);
2038 
2039 	asoc = &stcb->asoc;
2040 	/* get scope variables out of cookie */
2041 	asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2042 	asoc->scope.site_scope = cookie->site_scope;
2043 	asoc->scope.local_scope = cookie->local_scope;
2044 	asoc->scope.loopback_scope = cookie->loopback_scope;
2045 
2046 	if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2047 	    (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2048 		struct mbuf *op_err;
2049 
2050 		/*
2051 		 * Houston we have a problem. The EP changed while the
2052 		 * cookie was in flight. Only recourse is to abort the
2053 		 * association.
2054 		 */
2055 		op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2056 		sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2057 		    src, dst, sh, op_err,
2058 		    mflowtype, mflowid,
2059 		    vrf_id, port);
2060 		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2061 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2062 		return (NULL);
2063 	}
2064 	/* process the INIT-ACK info (my info) */
2065 	asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2066 	asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2067 	asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2068 	asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2069 	asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2070 	asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2071 	asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2072 	asoc->str_reset_seq_in = asoc->init_seq_number;
2073 
2074 	asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2075 
2076 	/* process the INIT info (peer's info) */
2077 	if (netp)
2078 		retval = sctp_process_init(init_cp, stcb);
2079 	else
2080 		retval = 0;
2081 	if (retval < 0) {
2082 		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2083 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2084 		return (NULL);
2085 	}
2086 	/* load all addresses */
2087 	if (sctp_load_addresses_from_init(stcb, m,
2088 	    init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2089 	    src, dst, init_src, port)) {
2090 		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2091 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2092 		return (NULL);
2093 	}
2094 	/*
2095 	 * verify any preceding AUTH chunk that was skipped
2096 	 */
2097 	/* pull the local authentication parameters from the cookie/init-ack */
2098 	sctp_auth_get_cookie_params(stcb, m,
2099 	    initack_offset + sizeof(struct sctp_init_ack_chunk),
2100 	    initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2101 	if (auth_skipped) {
2102 		struct sctp_auth_chunk *auth;
2103 
2104 		if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
2105 			auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2106 		} else {
2107 			auth = NULL;
2108 		}
2109 		if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2110 			/* auth HMAC failed, dump the assoc and packet */
2111 			SCTPDBG(SCTP_DEBUG_AUTH1,
2112 			    "COOKIE-ECHO: AUTH failed\n");
2113 			(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2114 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2115 			return (NULL);
2116 		} else {
2117 			/* remaining chunks checked... good to go */
2118 			stcb->asoc.authenticated = 1;
2119 		}
2120 	}
2121 
2122 	/*
2123 	 * if we're doing ASCONFs, check to see if we have any new local
2124 	 * addresses that need to get added to the peer (eg. addresses
2125 	 * changed while cookie echo in flight).  This needs to be done
2126 	 * after we go to the OPEN state to do the correct asconf
2127 	 * processing. else, make sure we have the correct addresses in our
2128 	 * lists
2129 	 */
2130 
2131 	/* warning, we re-use sin, sin6, sa_store here! */
2132 	/* pull in local_address (our "from" address) */
2133 	switch (cookie->laddr_type) {
2134 #ifdef INET
2135 	case SCTP_IPV4_ADDRESS:
2136 		/* source addr is IPv4 */
2137 		memset(&store.sin, 0, sizeof(struct sockaddr_in));
2138 		store.sin.sin_family = AF_INET;
2139 		store.sin.sin_len = sizeof(struct sockaddr_in);
2140 		store.sin.sin_addr.s_addr = cookie->laddress[0];
2141 		break;
2142 #endif
2143 #ifdef INET6
2144 	case SCTP_IPV6_ADDRESS:
2145 		/* source addr is IPv6 */
2146 		memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2147 		store.sin6.sin6_family = AF_INET6;
2148 		store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2149 		store.sin6.sin6_scope_id = cookie->scope_id;
2150 		memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2151 		break;
2152 #endif
2153 	default:
2154 		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2155 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2156 		return (NULL);
2157 	}
2158 
2159 	/* update current state */
2160 	SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2161 	SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2162 	if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2163 		sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2164 		    stcb->sctp_ep, stcb, NULL);
2165 	}
2166 	sctp_stop_all_cookie_timers(stcb);
2167 	SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2168 	SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2169 
2170 	/* set up to notify upper layer */
2171 	*notification = SCTP_NOTIFY_ASSOC_UP;
2172 	if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2173 	    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2174 	    (!SCTP_IS_LISTENING(inp))) {
2175 		/*
2176 		 * This is an endpoint that called connect() how it got a
2177 		 * cookie that is NEW is a bit of a mystery. It must be that
2178 		 * the INIT was sent, but before it got there.. a complete
2179 		 * INIT/INIT-ACK/COOKIE arrived. But of course then it
2180 		 * should have went to the other code.. not here.. oh well..
2181 		 * a bit of protection is worth having..
2182 		 */
2183 		stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2184 		soisconnected(stcb->sctp_socket);
2185 	} else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2186 	    (SCTP_IS_LISTENING(inp))) {
2187 		/*
2188 		 * We don't want to do anything with this one. Since it is
2189 		 * the listening guy. The timer will get started for
2190 		 * accepted connections in the caller.
2191 		 */
2192 		;
2193 	}
2194 	/* since we did not send a HB make sure we don't double things */
2195 	if ((netp) && (*netp))
2196 		(*netp)->hb_responded = 1;
2197 
2198 	if (stcb->asoc.sctp_autoclose_ticks &&
2199 	    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2200 		sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2201 	}
2202 	(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2203 	if ((netp != NULL) && (*netp != NULL)) {
2204 		struct timeval old;
2205 
2206 		/* calculate the RTT and set the encaps port */
2207 		old.tv_sec = cookie->time_entered.tv_sec;
2208 		old.tv_usec = cookie->time_entered.tv_usec;
2209 		sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
2210 	}
2211 	/* respond with a COOKIE-ACK */
2212 	sctp_send_cookie_ack(stcb);
2213 
2214 	/*
2215 	 * check the address lists for any ASCONFs that need to be sent
2216 	 * AFTER the cookie-ack is sent
2217 	 */
2218 	sctp_check_address_list(stcb, m,
2219 	    initack_offset + sizeof(struct sctp_init_ack_chunk),
2220 	    initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2221 	    &store.sa, cookie->local_scope, cookie->site_scope,
2222 	    cookie->ipv4_scope, cookie->loopback_scope);
2223 
2224 	return (stcb);
2225 }
2226 
2227 /*
2228  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2229  * we NEED to make sure we are not already using the vtag. If so we
2230  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2231 	head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2232 							    SCTP_BASE_INFO(hashasocmark))];
2233 	LIST_FOREACH(stcb, head, sctp_asocs) {
2234 	        if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2235 		       -- SEND ABORT - TRY AGAIN --
2236 		}
2237 	}
2238 */
2239 
2240 /*
2241  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2242  * existing (non-NULL) TCB
2243  */
2244 static struct mbuf *
2245 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2246     struct sockaddr *src, struct sockaddr *dst,
2247     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2248     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2249     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2250     struct sctp_tcb **locked_tcb,
2251     uint8_t mflowtype, uint32_t mflowid,
2252     uint32_t vrf_id, uint16_t port)
2253 {
2254 	struct sctp_state_cookie *cookie;
2255 	struct sctp_tcb *l_stcb = *stcb;
2256 	struct sctp_inpcb *l_inp;
2257 	struct sockaddr *to;
2258 	struct sctp_pcb *ep;
2259 	struct mbuf *m_sig;
2260 	uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2261 	uint8_t *sig;
2262 	uint8_t cookie_ok = 0;
2263 	unsigned int sig_offset, cookie_offset;
2264 	unsigned int cookie_len;
2265 	struct timeval now;
2266 	struct timeval time_expires;
2267 	int notification = 0;
2268 	struct sctp_nets *netl;
2269 	int had_a_existing_tcb = 0;
2270 	int send_int_conf = 0;
2271 #ifdef INET
2272 	struct sockaddr_in sin;
2273 #endif
2274 #ifdef INET6
2275 	struct sockaddr_in6 sin6;
2276 #endif
2277 
2278 	SCTPDBG(SCTP_DEBUG_INPUT2,
2279 	    "sctp_handle_cookie: handling COOKIE-ECHO\n");
2280 
2281 	if (inp_p == NULL) {
2282 		return (NULL);
2283 	}
2284 	cookie = &cp->cookie;
2285 	cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2286 	cookie_len = ntohs(cp->ch.chunk_length);
2287 
2288 	if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2289 	    sizeof(struct sctp_init_chunk) +
2290 	    sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2291 		/* cookie too small */
2292 		return (NULL);
2293 	}
2294 	if ((cookie->peerport != sh->src_port) ||
2295 	    (cookie->myport != sh->dest_port) ||
2296 	    (cookie->my_vtag != sh->v_tag)) {
2297 		/*
2298 		 * invalid ports or bad tag.  Note that we always leave the
2299 		 * v_tag in the header in network order and when we stored
2300 		 * it in the my_vtag slot we also left it in network order.
2301 		 * This maintains the match even though it may be in the
2302 		 * opposite byte order of the machine :->
2303 		 */
2304 		return (NULL);
2305 	}
2306 	/*
2307 	 * split off the signature into its own mbuf (since it should not be
2308 	 * calculated in the sctp_hmac_m() call).
2309 	 */
2310 	sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2311 	m_sig = m_split(m, sig_offset, M_NOWAIT);
2312 	if (m_sig == NULL) {
2313 		/* out of memory or ?? */
2314 		return (NULL);
2315 	}
2316 #ifdef SCTP_MBUF_LOGGING
2317 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2318 		sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2319 	}
2320 #endif
2321 
2322 	/*
2323 	 * compute the signature/digest for the cookie
2324 	 */
2325 	ep = &(*inp_p)->sctp_ep;
2326 	l_inp = *inp_p;
2327 	if (l_stcb) {
2328 		SCTP_TCB_UNLOCK(l_stcb);
2329 	}
2330 	SCTP_INP_RLOCK(l_inp);
2331 	if (l_stcb) {
2332 		SCTP_TCB_LOCK(l_stcb);
2333 	}
2334 	/* which cookie is it? */
2335 	if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2336 	    (ep->current_secret_number != ep->last_secret_number)) {
2337 		/* it's the old cookie */
2338 		(void)sctp_hmac_m(SCTP_HMAC,
2339 		    (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2340 		    SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2341 	} else {
2342 		/* it's the current cookie */
2343 		(void)sctp_hmac_m(SCTP_HMAC,
2344 		    (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2345 		    SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2346 	}
2347 	/* get the signature */
2348 	SCTP_INP_RUNLOCK(l_inp);
2349 	sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2350 	if (sig == NULL) {
2351 		/* couldn't find signature */
2352 		sctp_m_freem(m_sig);
2353 		return (NULL);
2354 	}
2355 	/* compare the received digest with the computed digest */
2356 	if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2357 		/* try the old cookie? */
2358 		if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2359 		    (ep->current_secret_number != ep->last_secret_number)) {
2360 			/* compute digest with old */
2361 			(void)sctp_hmac_m(SCTP_HMAC,
2362 			    (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2363 			    SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2364 			/* compare */
2365 			if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2366 				cookie_ok = 1;
2367 		}
2368 	} else {
2369 		cookie_ok = 1;
2370 	}
2371 
2372 	/*
2373 	 * Now before we continue we must reconstruct our mbuf so that
2374 	 * normal processing of any other chunks will work.
2375 	 */
2376 	{
2377 		struct mbuf *m_at;
2378 
2379 		m_at = m;
2380 		while (SCTP_BUF_NEXT(m_at) != NULL) {
2381 			m_at = SCTP_BUF_NEXT(m_at);
2382 		}
2383 		SCTP_BUF_NEXT(m_at) = m_sig;
2384 	}
2385 
2386 	if (cookie_ok == 0) {
2387 		SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2388 		SCTPDBG(SCTP_DEBUG_INPUT2,
2389 		    "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2390 		    (uint32_t)offset, cookie_offset, sig_offset);
2391 		return (NULL);
2392 	}
2393 
2394 	/*
2395 	 * check the cookie timestamps to be sure it's not stale
2396 	 */
2397 	(void)SCTP_GETTIME_TIMEVAL(&now);
2398 	/* Expire time is in Ticks, so we convert to seconds */
2399 	time_expires.tv_sec = cookie->time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
2400 	time_expires.tv_usec = cookie->time_entered.tv_usec;
2401 	if (timevalcmp(&now, &time_expires, >)) {
2402 		/* cookie is stale! */
2403 		struct mbuf *op_err;
2404 		struct sctp_error_stale_cookie *cause;
2405 		struct timeval diff;
2406 		uint32_t staleness;
2407 
2408 		op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2409 		    0, M_NOWAIT, 1, MT_DATA);
2410 		if (op_err == NULL) {
2411 			/* FOOBAR */
2412 			return (NULL);
2413 		}
2414 		/* Set the len */
2415 		SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2416 		cause = mtod(op_err, struct sctp_error_stale_cookie *);
2417 		cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2418 		cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2419 		    (sizeof(uint32_t))));
2420 		diff = now;
2421 		timevalsub(&diff, &time_expires);
2422 		if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2423 			staleness = UINT32_MAX;
2424 		} else {
2425 			staleness = diff.tv_sec * 1000000;
2426 		}
2427 		if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2428 			staleness += diff.tv_usec;
2429 		} else {
2430 			staleness = UINT32_MAX;
2431 		}
2432 		cause->stale_time = htonl(staleness);
2433 		sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2434 		    mflowtype, mflowid, l_inp->fibnum,
2435 		    vrf_id, port);
2436 		return (NULL);
2437 	}
2438 	/*
2439 	 * Now we must see with the lookup address if we have an existing
2440 	 * asoc. This will only happen if we were in the COOKIE-WAIT state
2441 	 * and a INIT collided with us and somewhere the peer sent the
2442 	 * cookie on another address besides the single address our assoc
2443 	 * had for him. In this case we will have one of the tie-tags set at
2444 	 * least AND the address field in the cookie can be used to look it
2445 	 * up.
2446 	 */
2447 	to = NULL;
2448 	switch (cookie->addr_type) {
2449 #ifdef INET6
2450 	case SCTP_IPV6_ADDRESS:
2451 		memset(&sin6, 0, sizeof(sin6));
2452 		sin6.sin6_family = AF_INET6;
2453 		sin6.sin6_len = sizeof(sin6);
2454 		sin6.sin6_port = sh->src_port;
2455 		sin6.sin6_scope_id = cookie->scope_id;
2456 		memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2457 		    sizeof(sin6.sin6_addr.s6_addr));
2458 		to = (struct sockaddr *)&sin6;
2459 		break;
2460 #endif
2461 #ifdef INET
2462 	case SCTP_IPV4_ADDRESS:
2463 		memset(&sin, 0, sizeof(sin));
2464 		sin.sin_family = AF_INET;
2465 		sin.sin_len = sizeof(sin);
2466 		sin.sin_port = sh->src_port;
2467 		sin.sin_addr.s_addr = cookie->address[0];
2468 		to = (struct sockaddr *)&sin;
2469 		break;
2470 #endif
2471 	default:
2472 		/* This should not happen */
2473 		return (NULL);
2474 	}
2475 	if (*stcb == NULL) {
2476 		/* Yep, lets check */
2477 		*stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2478 		if (*stcb == NULL) {
2479 			/*
2480 			 * We should have only got back the same inp. If we
2481 			 * got back a different ep we have a problem. The
2482 			 * original findep got back l_inp and now
2483 			 */
2484 			if (l_inp != *inp_p) {
2485 				SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2486 			}
2487 		} else {
2488 			if (*locked_tcb == NULL) {
2489 				/*
2490 				 * In this case we found the assoc only
2491 				 * after we locked the create lock. This
2492 				 * means we are in a colliding case and we
2493 				 * must make sure that we unlock the tcb if
2494 				 * its one of the cases where we throw away
2495 				 * the incoming packets.
2496 				 */
2497 				*locked_tcb = *stcb;
2498 
2499 				/*
2500 				 * We must also increment the inp ref count
2501 				 * since the ref_count flags was set when we
2502 				 * did not find the TCB, now we found it
2503 				 * which reduces the refcount.. we must
2504 				 * raise it back out to balance it all :-)
2505 				 */
2506 				SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2507 				if ((*stcb)->sctp_ep != l_inp) {
2508 					SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2509 					    (void *)(*stcb)->sctp_ep, (void *)l_inp);
2510 				}
2511 			}
2512 		}
2513 	}
2514 
2515 	cookie_len -= SCTP_SIGNATURE_SIZE;
2516 	if (*stcb == NULL) {
2517 		/* this is the "normal" case... get a new TCB */
2518 		*stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2519 		    cookie, cookie_len, *inp_p,
2520 		    netp, to, &notification,
2521 		    auth_skipped, auth_offset, auth_len,
2522 		    mflowtype, mflowid,
2523 		    vrf_id, port);
2524 	} else {
2525 		/* this is abnormal... cookie-echo on existing TCB */
2526 		had_a_existing_tcb = 1;
2527 		*stcb = sctp_process_cookie_existing(m, iphlen, offset,
2528 		    src, dst, sh,
2529 		    cookie, cookie_len, *inp_p, *stcb, netp, to,
2530 		    &notification, auth_skipped, auth_offset, auth_len,
2531 		    mflowtype, mflowid,
2532 		    vrf_id, port);
2533 	}
2534 
2535 	if (*stcb == NULL) {
2536 		/* still no TCB... must be bad cookie-echo */
2537 		return (NULL);
2538 	}
2539 	if (*netp != NULL) {
2540 		(*netp)->flowtype = mflowtype;
2541 		(*netp)->flowid = mflowid;
2542 	}
2543 	/*
2544 	 * Ok, we built an association so confirm the address we sent the
2545 	 * INIT-ACK to.
2546 	 */
2547 	netl = sctp_findnet(*stcb, to);
2548 	/*
2549 	 * This code should in theory NOT run but
2550 	 */
2551 	if (netl == NULL) {
2552 		/* TSNH! Huh, why do I need to add this address here? */
2553 		if (sctp_add_remote_addr(*stcb, to, NULL, port,
2554 		    SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2555 			return (NULL);
2556 		}
2557 		netl = sctp_findnet(*stcb, to);
2558 	}
2559 	if (netl) {
2560 		if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2561 			netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2562 			(void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2563 			    netl);
2564 			send_int_conf = 1;
2565 		}
2566 	}
2567 	sctp_start_net_timers(*stcb);
2568 	if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2569 		if (!had_a_existing_tcb ||
2570 		    (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2571 			/*
2572 			 * If we have a NEW cookie or the connect never
2573 			 * reached the connected state during collision we
2574 			 * must do the TCP accept thing.
2575 			 */
2576 			struct socket *so, *oso;
2577 			struct sctp_inpcb *inp;
2578 
2579 			if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2580 				/*
2581 				 * For a restart we will keep the same
2582 				 * socket, no need to do anything. I THINK!!
2583 				 */
2584 				sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2585 				if (send_int_conf) {
2586 					sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2587 					    (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2588 				}
2589 				return (m);
2590 			}
2591 			oso = (*inp_p)->sctp_socket;
2592 			atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2593 			SCTP_TCB_UNLOCK((*stcb));
2594 			CURVNET_SET(oso->so_vnet);
2595 			so = sonewconn(oso, 0
2596 			    );
2597 			CURVNET_RESTORE();
2598 			SCTP_TCB_LOCK((*stcb));
2599 			atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2600 
2601 			if (so == NULL) {
2602 				struct mbuf *op_err;
2603 
2604 				/* Too many sockets */
2605 				SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2606 				op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2607 				sctp_abort_association(*inp_p, NULL, m, iphlen,
2608 				    src, dst, sh, op_err,
2609 				    mflowtype, mflowid,
2610 				    vrf_id, port);
2611 				(void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2612 				    SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2613 				return (NULL);
2614 			}
2615 			inp = (struct sctp_inpcb *)so->so_pcb;
2616 			SCTP_INP_INCR_REF(inp);
2617 			/*
2618 			 * We add the unbound flag here so that if we get an
2619 			 * soabort() before we get the move_pcb done, we
2620 			 * will properly cleanup.
2621 			 */
2622 			inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2623 			    SCTP_PCB_FLAGS_CONNECTED |
2624 			    SCTP_PCB_FLAGS_IN_TCPPOOL |
2625 			    SCTP_PCB_FLAGS_UNBOUND |
2626 			    (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2627 			    SCTP_PCB_FLAGS_DONT_WAKE);
2628 			inp->sctp_features = (*inp_p)->sctp_features;
2629 			inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2630 			inp->sctp_socket = so;
2631 			inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2632 			inp->max_cwnd = (*inp_p)->max_cwnd;
2633 			inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2634 			inp->ecn_supported = (*inp_p)->ecn_supported;
2635 			inp->prsctp_supported = (*inp_p)->prsctp_supported;
2636 			inp->auth_supported = (*inp_p)->auth_supported;
2637 			inp->asconf_supported = (*inp_p)->asconf_supported;
2638 			inp->reconfig_supported = (*inp_p)->reconfig_supported;
2639 			inp->nrsack_supported = (*inp_p)->nrsack_supported;
2640 			inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2641 			inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2642 			inp->sctp_context = (*inp_p)->sctp_context;
2643 			inp->local_strreset_support = (*inp_p)->local_strreset_support;
2644 			inp->fibnum = (*inp_p)->fibnum;
2645 			inp->inp_starting_point_for_iterator = NULL;
2646 			/*
2647 			 * copy in the authentication parameters from the
2648 			 * original endpoint
2649 			 */
2650 			if (inp->sctp_ep.local_hmacs)
2651 				sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2652 			inp->sctp_ep.local_hmacs =
2653 			    sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2654 			if (inp->sctp_ep.local_auth_chunks)
2655 				sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2656 			inp->sctp_ep.local_auth_chunks =
2657 			    sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2658 
2659 			/*
2660 			 * Now we must move it from one hash table to
2661 			 * another and get the tcb in the right place.
2662 			 */
2663 
2664 			/*
2665 			 * This is where the one-2-one socket is put into
2666 			 * the accept state waiting for the accept!
2667 			 */
2668 			if (*stcb) {
2669 				SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2670 			}
2671 			sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2672 
2673 			atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2674 			SCTP_TCB_UNLOCK((*stcb));
2675 
2676 			sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2677 			    0);
2678 			SCTP_TCB_LOCK((*stcb));
2679 			atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2680 
2681 			/*
2682 			 * now we must check to see if we were aborted while
2683 			 * the move was going on and the lock/unlock
2684 			 * happened.
2685 			 */
2686 			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2687 				/*
2688 				 * yep it was, we leave the assoc attached
2689 				 * to the socket since the sctp_inpcb_free()
2690 				 * call will send an abort for us.
2691 				 */
2692 				SCTP_INP_DECR_REF(inp);
2693 				return (NULL);
2694 			}
2695 			SCTP_INP_DECR_REF(inp);
2696 			/* Switch over to the new guy */
2697 			*inp_p = inp;
2698 			sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2699 			if (send_int_conf) {
2700 				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2701 				    (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2702 			}
2703 
2704 			/*
2705 			 * Pull it from the incomplete queue and wake the
2706 			 * guy
2707 			 */
2708 			soisconnected(so);
2709 			return (m);
2710 		}
2711 	}
2712 	if (notification) {
2713 		sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2714 	}
2715 	if (send_int_conf) {
2716 		sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2717 		    (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2718 	}
2719 	return (m);
2720 }
2721 
2722 static void
2723 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2724     struct sctp_tcb *stcb, struct sctp_nets *net)
2725 {
2726 	/* cp must not be used, others call this without a c-ack :-) */
2727 	struct sctp_association *asoc;
2728 	struct sctp_tmit_chunk *chk;
2729 
2730 	SCTPDBG(SCTP_DEBUG_INPUT2,
2731 	    "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2732 	if ((stcb == NULL) || (net == NULL)) {
2733 		return;
2734 	}
2735 
2736 	asoc = &stcb->asoc;
2737 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2738 		sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2739 		    asoc->overall_error_count,
2740 		    0,
2741 		    SCTP_FROM_SCTP_INPUT,
2742 		    __LINE__);
2743 	}
2744 	asoc->overall_error_count = 0;
2745 	sctp_stop_all_cookie_timers(stcb);
2746 	/* process according to association state */
2747 	if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2748 		/* state change only needed when I am in right state */
2749 		SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2750 		SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2751 		sctp_start_net_timers(stcb);
2752 		if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2753 			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2754 			    stcb->sctp_ep, stcb, NULL);
2755 		}
2756 		/* update RTO */
2757 		SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2758 		SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2759 		if (asoc->overall_error_count == 0) {
2760 			sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2761 			    SCTP_RTT_FROM_NON_DATA);
2762 		}
2763 		(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2764 		sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2765 		if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2766 		    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2767 			stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2768 			if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2769 				soisconnected(stcb->sctp_socket);
2770 			}
2771 		}
2772 		/*
2773 		 * since we did not send a HB make sure we don't double
2774 		 * things
2775 		 */
2776 		net->hb_responded = 1;
2777 
2778 		if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2779 			/*
2780 			 * We don't need to do the asconf thing, nor hb or
2781 			 * autoclose if the socket is closed.
2782 			 */
2783 			goto closed_socket;
2784 		}
2785 
2786 		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2787 		    stcb, net);
2788 
2789 		if (stcb->asoc.sctp_autoclose_ticks &&
2790 		    sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2791 			sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2792 			    stcb->sctp_ep, stcb, NULL);
2793 		}
2794 		/*
2795 		 * send ASCONF if parameters are pending and ASCONFs are
2796 		 * allowed (eg. addresses changed when init/cookie echo were
2797 		 * in flight)
2798 		 */
2799 		if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2800 		    (stcb->asoc.asconf_supported == 1) &&
2801 		    (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2802 #ifdef SCTP_TIMER_BASED_ASCONF
2803 			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2804 			    stcb->sctp_ep, stcb,
2805 			    stcb->asoc.primary_destination);
2806 #else
2807 			sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2808 			    SCTP_ADDR_NOT_LOCKED);
2809 #endif
2810 		}
2811 	}
2812 closed_socket:
2813 	/* Toss the cookie if I can */
2814 	sctp_toss_old_cookies(stcb, asoc);
2815 	/* Restart the timer if we have pending data */
2816 	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
2817 		if (chk->whoTo != NULL) {
2818 			break;
2819 		}
2820 	}
2821 	if (chk != NULL) {
2822 		sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2823 	}
2824 }
2825 
2826 static void
2827 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2828     struct sctp_tcb *stcb)
2829 {
2830 	struct sctp_nets *net;
2831 	struct sctp_tmit_chunk *lchk;
2832 	struct sctp_ecne_chunk bkup;
2833 	uint8_t override_bit;
2834 	uint32_t tsn, window_data_tsn;
2835 	int len;
2836 	unsigned int pkt_cnt;
2837 
2838 	len = ntohs(cp->ch.chunk_length);
2839 	if ((len != sizeof(struct sctp_ecne_chunk)) &&
2840 	    (len != sizeof(struct old_sctp_ecne_chunk))) {
2841 		return;
2842 	}
2843 	if (len == sizeof(struct old_sctp_ecne_chunk)) {
2844 		/* Its the old format */
2845 		memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2846 		bkup.num_pkts_since_cwr = htonl(1);
2847 		cp = &bkup;
2848 	}
2849 	SCTP_STAT_INCR(sctps_recvecne);
2850 	tsn = ntohl(cp->tsn);
2851 	pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2852 	lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2853 	if (lchk == NULL) {
2854 		window_data_tsn = stcb->asoc.sending_seq - 1;
2855 	} else {
2856 		window_data_tsn = lchk->rec.data.tsn;
2857 	}
2858 
2859 	/* Find where it was sent to if possible. */
2860 	net = NULL;
2861 	TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2862 		if (lchk->rec.data.tsn == tsn) {
2863 			net = lchk->whoTo;
2864 			net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2865 			break;
2866 		}
2867 		if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
2868 			break;
2869 		}
2870 	}
2871 	if (net == NULL) {
2872 		/*
2873 		 * What to do. A previous send of a CWR was possibly lost.
2874 		 * See how old it is, we may have it marked on the actual
2875 		 * net.
2876 		 */
2877 		TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2878 			if (tsn == net->last_cwr_tsn) {
2879 				/* Found him, send it off */
2880 				break;
2881 			}
2882 		}
2883 		if (net == NULL) {
2884 			/*
2885 			 * If we reach here, we need to send a special CWR
2886 			 * that says hey, we did this a long time ago and
2887 			 * you lost the response.
2888 			 */
2889 			net = TAILQ_FIRST(&stcb->asoc.nets);
2890 			if (net == NULL) {
2891 				/* TSNH */
2892 				return;
2893 			}
2894 			override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2895 		} else {
2896 			override_bit = 0;
2897 		}
2898 	} else {
2899 		override_bit = 0;
2900 	}
2901 	if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2902 	    ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2903 		/*
2904 		 * JRS - Use the congestion control given in the pluggable
2905 		 * CC module
2906 		 */
2907 		stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2908 		/*
2909 		 * We reduce once every RTT. So we will only lower cwnd at
2910 		 * the next sending seq i.e. the window_data_tsn
2911 		 */
2912 		net->cwr_window_tsn = window_data_tsn;
2913 		net->ecn_ce_pkt_cnt += pkt_cnt;
2914 		net->lost_cnt = pkt_cnt;
2915 		net->last_cwr_tsn = tsn;
2916 	} else {
2917 		override_bit |= SCTP_CWR_IN_SAME_WINDOW;
2918 		if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
2919 		    ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2920 			/*
2921 			 * Another loss in the same window update how many
2922 			 * marks/packets lost we have had.
2923 			 */
2924 			int cnt = 1;
2925 
2926 			if (pkt_cnt > net->lost_cnt) {
2927 				/* Should be the case */
2928 				cnt = (pkt_cnt - net->lost_cnt);
2929 				net->ecn_ce_pkt_cnt += cnt;
2930 			}
2931 			net->lost_cnt = pkt_cnt;
2932 			net->last_cwr_tsn = tsn;
2933 			/*
2934 			 * Most CC functions will ignore this call, since we
2935 			 * are in-window yet of the initial CE the peer saw.
2936 			 */
2937 			stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
2938 		}
2939 	}
2940 	/*
2941 	 * We always send a CWR this way if our previous one was lost our
2942 	 * peer will get an update, or if it is not time again to reduce we
2943 	 * still get the cwr to the peer. Note we set the override when we
2944 	 * could not find the TSN on the chunk or the destination network.
2945 	 */
2946 	sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
2947 }
2948 
2949 static void
2950 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
2951 {
2952 	/*
2953 	 * Here we get a CWR from the peer. We must look in the outqueue and
2954 	 * make sure that we have a covered ECNE in the control chunk part.
2955 	 * If so remove it.
2956 	 */
2957 	struct sctp_tmit_chunk *chk, *nchk;
2958 	struct sctp_ecne_chunk *ecne;
2959 	int override;
2960 	uint32_t cwr_tsn;
2961 
2962 	cwr_tsn = ntohl(cp->tsn);
2963 	override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
2964 	TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
2965 		if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
2966 			continue;
2967 		}
2968 		if ((override == 0) && (chk->whoTo != net)) {
2969 			/* Must be from the right src unless override is set */
2970 			continue;
2971 		}
2972 		ecne = mtod(chk->data, struct sctp_ecne_chunk *);
2973 		if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
2974 			/* this covers this ECNE, we can remove it */
2975 			stcb->asoc.ecn_echo_cnt_onq--;
2976 			TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
2977 			    sctp_next);
2978 			stcb->asoc.ctrl_queue_cnt--;
2979 			sctp_m_freem(chk->data);
2980 			chk->data = NULL;
2981 			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
2982 			if (override == 0) {
2983 				break;
2984 			}
2985 		}
2986 	}
2987 }
2988 
2989 static void
2990 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
2991     struct sctp_tcb *stcb, struct sctp_nets *net)
2992 {
2993 
2994 	SCTPDBG(SCTP_DEBUG_INPUT2,
2995 	    "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
2996 	if (stcb == NULL)
2997 		return;
2998 
2999 	/* process according to association state */
3000 	if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3001 		/* unexpected SHUTDOWN-COMPLETE... so ignore... */
3002 		SCTPDBG(SCTP_DEBUG_INPUT2,
3003 		    "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3004 		SCTP_TCB_UNLOCK(stcb);
3005 		return;
3006 	}
3007 	/* notify upper layer protocol */
3008 	if (stcb->sctp_socket) {
3009 		sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3010 	}
3011 #ifdef INVARIANTS
3012 	if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3013 	    !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3014 	    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3015 		panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3016 	}
3017 #endif
3018 	/* stop the timer */
3019 	sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3020 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3021 	SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3022 	/* free the TCB */
3023 	SCTPDBG(SCTP_DEBUG_INPUT2,
3024 	    "sctp_handle_shutdown_complete: calls free-asoc\n");
3025 	(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3026 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3027 	return;
3028 }
3029 
3030 static int
3031 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3032     struct sctp_nets *net, uint8_t flg)
3033 {
3034 	switch (desc->chunk_type) {
3035 	case SCTP_DATA:
3036 	case SCTP_IDATA:
3037 		/* find the tsn to resend (possibly) */
3038 		{
3039 			uint32_t tsn;
3040 			struct sctp_tmit_chunk *tp1;
3041 
3042 			tsn = ntohl(desc->tsn_ifany);
3043 			TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3044 				if (tp1->rec.data.tsn == tsn) {
3045 					/* found it */
3046 					break;
3047 				}
3048 				if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3049 					/* not found */
3050 					tp1 = NULL;
3051 					break;
3052 				}
3053 			}
3054 			if (tp1 == NULL) {
3055 				/*
3056 				 * Do it the other way , aka without paying
3057 				 * attention to queue seq order.
3058 				 */
3059 				SCTP_STAT_INCR(sctps_pdrpdnfnd);
3060 				TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3061 					if (tp1->rec.data.tsn == tsn) {
3062 						/* found it */
3063 						break;
3064 					}
3065 				}
3066 			}
3067 			if (tp1 == NULL) {
3068 				SCTP_STAT_INCR(sctps_pdrptsnnf);
3069 			}
3070 			if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3071 				if (((flg & SCTP_BADCRC) == 0) &&
3072 				    ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3073 					return (0);
3074 				}
3075 				if ((stcb->asoc.peers_rwnd == 0) &&
3076 				    ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3077 					SCTP_STAT_INCR(sctps_pdrpdiwnp);
3078 					return (0);
3079 				}
3080 				if (stcb->asoc.peers_rwnd == 0 &&
3081 				    (flg & SCTP_FROM_MIDDLE_BOX)) {
3082 					SCTP_STAT_INCR(sctps_pdrpdizrw);
3083 					return (0);
3084 				}
3085 				if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
3086 				    SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
3087 					/* Payload not matching. */
3088 					SCTP_STAT_INCR(sctps_pdrpbadd);
3089 					return (-1);
3090 				}
3091 				if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb),
3092 				    desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
3093 					/* Payload not matching. */
3094 					SCTP_STAT_INCR(sctps_pdrpbadd);
3095 					return (-1);
3096 				}
3097 				if (tp1->do_rtt) {
3098 					/*
3099 					 * this guy had a RTO calculation
3100 					 * pending on it, cancel it
3101 					 */
3102 					if (tp1->whoTo->rto_needed == 0) {
3103 						tp1->whoTo->rto_needed = 1;
3104 					}
3105 					tp1->do_rtt = 0;
3106 				}
3107 				SCTP_STAT_INCR(sctps_pdrpmark);
3108 				if (tp1->sent != SCTP_DATAGRAM_RESEND)
3109 					sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3110 				/*
3111 				 * mark it as if we were doing a FR, since
3112 				 * we will be getting gap ack reports behind
3113 				 * the info from the router.
3114 				 */
3115 				tp1->rec.data.doing_fast_retransmit = 1;
3116 				/*
3117 				 * mark the tsn with what sequences can
3118 				 * cause a new FR.
3119 				 */
3120 				if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3121 					tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3122 				} else {
3123 					tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3124 				}
3125 
3126 				/* restart the timer */
3127 				sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3128 				    stcb, tp1->whoTo,
3129 				    SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3130 				sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3131 				    stcb, tp1->whoTo);
3132 
3133 				/* fix counts and things */
3134 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3135 					sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3136 					    tp1->whoTo->flight_size,
3137 					    tp1->book_size,
3138 					    (uint32_t)(uintptr_t)stcb,
3139 					    tp1->rec.data.tsn);
3140 				}
3141 				if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3142 					sctp_flight_size_decrease(tp1);
3143 					sctp_total_flight_decrease(stcb, tp1);
3144 				}
3145 				tp1->sent = SCTP_DATAGRAM_RESEND;
3146 			} {
3147 				/* audit code */
3148 				unsigned int audit;
3149 
3150 				audit = 0;
3151 				TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3152 					if (tp1->sent == SCTP_DATAGRAM_RESEND)
3153 						audit++;
3154 				}
3155 				TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3156 				    sctp_next) {
3157 					if (tp1->sent == SCTP_DATAGRAM_RESEND)
3158 						audit++;
3159 				}
3160 				if (audit != stcb->asoc.sent_queue_retran_cnt) {
3161 					SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3162 					    audit, stcb->asoc.sent_queue_retran_cnt);
3163 #ifndef SCTP_AUDITING_ENABLED
3164 					stcb->asoc.sent_queue_retran_cnt = audit;
3165 #endif
3166 				}
3167 			}
3168 		}
3169 		break;
3170 	case SCTP_ASCONF:
3171 		{
3172 			struct sctp_tmit_chunk *asconf;
3173 
3174 			TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3175 			    sctp_next) {
3176 				if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3177 					break;
3178 				}
3179 			}
3180 			if (asconf) {
3181 				if (asconf->sent != SCTP_DATAGRAM_RESEND)
3182 					sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3183 				asconf->sent = SCTP_DATAGRAM_RESEND;
3184 				asconf->snd_count--;
3185 			}
3186 		}
3187 		break;
3188 	case SCTP_INITIATION:
3189 		/* resend the INIT */
3190 		stcb->asoc.dropped_special_cnt++;
3191 		if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3192 			/*
3193 			 * If we can get it in, in a few attempts we do
3194 			 * this, otherwise we let the timer fire.
3195 			 */
3196 			sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3197 			    stcb, net,
3198 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3199 			sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3200 		}
3201 		break;
3202 	case SCTP_SELECTIVE_ACK:
3203 	case SCTP_NR_SELECTIVE_ACK:
3204 		/* resend the sack */
3205 		sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3206 		break;
3207 	case SCTP_HEARTBEAT_REQUEST:
3208 		/* resend a demand HB */
3209 		if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3210 			/*
3211 			 * Only retransmit if we KNOW we wont destroy the
3212 			 * tcb
3213 			 */
3214 			sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3215 		}
3216 		break;
3217 	case SCTP_SHUTDOWN:
3218 		sctp_send_shutdown(stcb, net);
3219 		break;
3220 	case SCTP_SHUTDOWN_ACK:
3221 		sctp_send_shutdown_ack(stcb, net);
3222 		break;
3223 	case SCTP_COOKIE_ECHO:
3224 		{
3225 			struct sctp_tmit_chunk *cookie;
3226 
3227 			cookie = NULL;
3228 			TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3229 			    sctp_next) {
3230 				if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3231 					break;
3232 				}
3233 			}
3234 			if (cookie) {
3235 				if (cookie->sent != SCTP_DATAGRAM_RESEND)
3236 					sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3237 				cookie->sent = SCTP_DATAGRAM_RESEND;
3238 				sctp_stop_all_cookie_timers(stcb);
3239 			}
3240 		}
3241 		break;
3242 	case SCTP_COOKIE_ACK:
3243 		sctp_send_cookie_ack(stcb);
3244 		break;
3245 	case SCTP_ASCONF_ACK:
3246 		/* resend last asconf ack */
3247 		sctp_send_asconf_ack(stcb);
3248 		break;
3249 	case SCTP_IFORWARD_CUM_TSN:
3250 	case SCTP_FORWARD_CUM_TSN:
3251 		send_forward_tsn(stcb, &stcb->asoc);
3252 		break;
3253 		/* can't do anything with these */
3254 	case SCTP_PACKET_DROPPED:
3255 	case SCTP_INITIATION_ACK:	/* this should not happen */
3256 	case SCTP_HEARTBEAT_ACK:
3257 	case SCTP_ABORT_ASSOCIATION:
3258 	case SCTP_OPERATION_ERROR:
3259 	case SCTP_SHUTDOWN_COMPLETE:
3260 	case SCTP_ECN_ECHO:
3261 	case SCTP_ECN_CWR:
3262 	default:
3263 		break;
3264 	}
3265 	return (0);
3266 }
3267 
3268 void
3269 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3270 {
3271 	uint32_t i;
3272 	uint16_t temp;
3273 
3274 	/*
3275 	 * We set things to 0xffffffff since this is the last delivered
3276 	 * sequence and we will be sending in 0 after the reset.
3277 	 */
3278 
3279 	if (number_entries) {
3280 		for (i = 0; i < number_entries; i++) {
3281 			temp = ntohs(list[i]);
3282 			if (temp >= stcb->asoc.streamincnt) {
3283 				continue;
3284 			}
3285 			stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3286 		}
3287 	} else {
3288 		list = NULL;
3289 		for (i = 0; i < stcb->asoc.streamincnt; i++) {
3290 			stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3291 		}
3292 	}
3293 	sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3294 }
3295 
3296 static void
3297 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3298 {
3299 	uint32_t i;
3300 	uint16_t temp;
3301 
3302 	if (number_entries > 0) {
3303 		for (i = 0; i < number_entries; i++) {
3304 			temp = ntohs(list[i]);
3305 			if (temp >= stcb->asoc.streamoutcnt) {
3306 				/* no such stream */
3307 				continue;
3308 			}
3309 			stcb->asoc.strmout[temp].next_mid_ordered = 0;
3310 			stcb->asoc.strmout[temp].next_mid_unordered = 0;
3311 		}
3312 	} else {
3313 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3314 			stcb->asoc.strmout[i].next_mid_ordered = 0;
3315 			stcb->asoc.strmout[i].next_mid_unordered = 0;
3316 		}
3317 	}
3318 	sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3319 }
3320 
3321 static void
3322 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3323 {
3324 	uint32_t i;
3325 	uint16_t temp;
3326 
3327 	if (number_entries > 0) {
3328 		for (i = 0; i < number_entries; i++) {
3329 			temp = ntohs(list[i]);
3330 			if (temp >= stcb->asoc.streamoutcnt) {
3331 				/* no such stream */
3332 				continue;
3333 			}
3334 			stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3335 		}
3336 	} else {
3337 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3338 			stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3339 		}
3340 	}
3341 }
3342 
3343 struct sctp_stream_reset_request *
3344 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3345 {
3346 	struct sctp_association *asoc;
3347 	struct sctp_chunkhdr *ch;
3348 	struct sctp_stream_reset_request *r;
3349 	struct sctp_tmit_chunk *chk;
3350 	int len, clen;
3351 
3352 	asoc = &stcb->asoc;
3353 	if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3354 		asoc->stream_reset_outstanding = 0;
3355 		return (NULL);
3356 	}
3357 	if (stcb->asoc.str_reset == NULL) {
3358 		asoc->stream_reset_outstanding = 0;
3359 		return (NULL);
3360 	}
3361 	chk = stcb->asoc.str_reset;
3362 	if (chk->data == NULL) {
3363 		return (NULL);
3364 	}
3365 	if (bchk) {
3366 		/* he wants a copy of the chk pointer */
3367 		*bchk = chk;
3368 	}
3369 	clen = chk->send_size;
3370 	ch = mtod(chk->data, struct sctp_chunkhdr *);
3371 	r = (struct sctp_stream_reset_request *)(ch + 1);
3372 	if (ntohl(r->request_seq) == seq) {
3373 		/* found it */
3374 		return (r);
3375 	}
3376 	len = SCTP_SIZE32(ntohs(r->ph.param_length));
3377 	if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3378 		/* move to the next one, there can only be a max of two */
3379 		r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3380 		if (ntohl(r->request_seq) == seq) {
3381 			return (r);
3382 		}
3383 	}
3384 	/* that seq is not here */
3385 	return (NULL);
3386 }
3387 
3388 static void
3389 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3390 {
3391 	struct sctp_association *asoc;
3392 	struct sctp_tmit_chunk *chk;
3393 
3394 	asoc = &stcb->asoc;
3395 	chk = asoc->str_reset;
3396 	if (chk == NULL) {
3397 		return;
3398 	}
3399 	asoc->str_reset = NULL;
3400 	sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3401 	    NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3402 	TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3403 	asoc->ctrl_queue_cnt--;
3404 	if (chk->data) {
3405 		sctp_m_freem(chk->data);
3406 		chk->data = NULL;
3407 	}
3408 	sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3409 }
3410 
3411 static int
3412 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3413     uint32_t seq, uint32_t action,
3414     struct sctp_stream_reset_response *respin)
3415 {
3416 	uint16_t type;
3417 	int lparam_len;
3418 	struct sctp_association *asoc = &stcb->asoc;
3419 	struct sctp_tmit_chunk *chk;
3420 	struct sctp_stream_reset_request *req_param;
3421 	struct sctp_stream_reset_out_request *req_out_param;
3422 	struct sctp_stream_reset_in_request *req_in_param;
3423 	uint32_t number_entries;
3424 
3425 	if (asoc->stream_reset_outstanding == 0) {
3426 		/* duplicate */
3427 		return (0);
3428 	}
3429 	if (seq == stcb->asoc.str_reset_seq_out) {
3430 		req_param = sctp_find_stream_reset(stcb, seq, &chk);
3431 		if (req_param != NULL) {
3432 			stcb->asoc.str_reset_seq_out++;
3433 			type = ntohs(req_param->ph.param_type);
3434 			lparam_len = ntohs(req_param->ph.param_length);
3435 			if (type == SCTP_STR_RESET_OUT_REQUEST) {
3436 				int no_clear = 0;
3437 
3438 				req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3439 				number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3440 				asoc->stream_reset_out_is_outstanding = 0;
3441 				if (asoc->stream_reset_outstanding)
3442 					asoc->stream_reset_outstanding--;
3443 				if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3444 					/* do it */
3445 					sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3446 				} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3447 					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3448 				} else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3449 					/*
3450 					 * Set it up so we don't stop
3451 					 * retransmitting
3452 					 */
3453 					asoc->stream_reset_outstanding++;
3454 					stcb->asoc.str_reset_seq_out--;
3455 					asoc->stream_reset_out_is_outstanding = 1;
3456 					no_clear = 1;
3457 				} else {
3458 					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3459 				}
3460 				if (no_clear == 0) {
3461 					sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3462 				}
3463 			} else if (type == SCTP_STR_RESET_IN_REQUEST) {
3464 				req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3465 				number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3466 				if (asoc->stream_reset_outstanding)
3467 					asoc->stream_reset_outstanding--;
3468 				if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3469 					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3470 					    number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3471 				} else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3472 					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3473 					    number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3474 				}
3475 			} else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3476 				/* Ok we now may have more streams */
3477 				int num_stream;
3478 
3479 				num_stream = stcb->asoc.strm_pending_add_size;
3480 				if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3481 					/* TSNH */
3482 					num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3483 				}
3484 				stcb->asoc.strm_pending_add_size = 0;
3485 				if (asoc->stream_reset_outstanding)
3486 					asoc->stream_reset_outstanding--;
3487 				if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3488 					/* Put the new streams into effect */
3489 					int i;
3490 
3491 					for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3492 						asoc->strmout[i].state = SCTP_STREAM_OPEN;
3493 					}
3494 					asoc->streamoutcnt += num_stream;
3495 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3496 				} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3497 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3498 					    SCTP_STREAM_CHANGE_DENIED);
3499 				} else {
3500 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3501 					    SCTP_STREAM_CHANGE_FAILED);
3502 				}
3503 			} else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3504 				if (asoc->stream_reset_outstanding)
3505 					asoc->stream_reset_outstanding--;
3506 				if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3507 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3508 					    SCTP_STREAM_CHANGE_DENIED);
3509 				} else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3510 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3511 					    SCTP_STREAM_CHANGE_FAILED);
3512 				}
3513 			} else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3514 				/**
3515 				 * a) Adopt the new in tsn.
3516 				 * b) reset the map
3517 				 * c) Adopt the new out-tsn
3518 				 */
3519 				struct sctp_stream_reset_response_tsn *resp;
3520 				struct sctp_forward_tsn_chunk fwdtsn;
3521 				int abort_flag = 0;
3522 
3523 				if (respin == NULL) {
3524 					/* huh ? */
3525 					return (0);
3526 				}
3527 				if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3528 					return (0);
3529 				}
3530 				if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3531 					resp = (struct sctp_stream_reset_response_tsn *)respin;
3532 					asoc->stream_reset_outstanding--;
3533 					fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3534 					fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3535 					fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3536 					sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3537 					if (abort_flag) {
3538 						return (1);
3539 					}
3540 					stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3541 					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3542 						sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3543 					}
3544 
3545 					stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3546 					stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3547 					memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3548 
3549 					stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3550 					memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3551 
3552 					stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3553 					stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3554 
3555 					sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3556 					sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3557 					sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3558 				} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3559 					sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3560 					    SCTP_ASSOC_RESET_DENIED);
3561 				} else {
3562 					sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3563 					    SCTP_ASSOC_RESET_FAILED);
3564 				}
3565 			}
3566 			/* get rid of the request and get the request flags */
3567 			if (asoc->stream_reset_outstanding == 0) {
3568 				sctp_clean_up_stream_reset(stcb);
3569 			}
3570 		}
3571 	}
3572 	if (asoc->stream_reset_outstanding == 0) {
3573 		sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3574 	}
3575 	return (0);
3576 }
3577 
3578 static void
3579 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3580     struct sctp_tmit_chunk *chk,
3581     struct sctp_stream_reset_in_request *req, int trunc)
3582 {
3583 	uint32_t seq;
3584 	int len, i;
3585 	int number_entries;
3586 	uint16_t temp;
3587 
3588 	/*
3589 	 * peer wants me to send a str-reset to him for my outgoing seq's if
3590 	 * seq_in is right.
3591 	 */
3592 	struct sctp_association *asoc = &stcb->asoc;
3593 
3594 	seq = ntohl(req->request_seq);
3595 	if (asoc->str_reset_seq_in == seq) {
3596 		asoc->last_reset_action[1] = asoc->last_reset_action[0];
3597 		if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3598 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3599 		} else if (trunc) {
3600 			/* Can't do it, since they exceeded our buffer size  */
3601 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3602 		} else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3603 			len = ntohs(req->ph.param_length);
3604 			number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3605 			if (number_entries) {
3606 				for (i = 0; i < number_entries; i++) {
3607 					temp = ntohs(req->list_of_streams[i]);
3608 					if (temp >= stcb->asoc.streamoutcnt) {
3609 						asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3610 						goto bad_boy;
3611 					}
3612 					req->list_of_streams[i] = temp;
3613 				}
3614 				for (i = 0; i < number_entries; i++) {
3615 					if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3616 						stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3617 					}
3618 				}
3619 			} else {
3620 				/* Its all */
3621 				for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3622 					if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3623 						stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3624 				}
3625 			}
3626 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3627 		} else {
3628 			/* Can't do it, since we have sent one out */
3629 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3630 		}
3631 bad_boy:
3632 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3633 		asoc->str_reset_seq_in++;
3634 	} else if (asoc->str_reset_seq_in - 1 == seq) {
3635 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3636 	} else if (asoc->str_reset_seq_in - 2 == seq) {
3637 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3638 	} else {
3639 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3640 	}
3641 	sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3642 }
3643 
3644 static int
3645 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3646     struct sctp_tmit_chunk *chk,
3647     struct sctp_stream_reset_tsn_request *req)
3648 {
3649 	/* reset all in and out and update the tsn */
3650 	/*
3651 	 * A) reset my str-seq's on in and out. B) Select a receive next,
3652 	 * and set cum-ack to it. Also process this selected number as a
3653 	 * fwd-tsn as well. C) set in the response my next sending seq.
3654 	 */
3655 	struct sctp_forward_tsn_chunk fwdtsn;
3656 	struct sctp_association *asoc = &stcb->asoc;
3657 	int abort_flag = 0;
3658 	uint32_t seq;
3659 
3660 	seq = ntohl(req->request_seq);
3661 	if (asoc->str_reset_seq_in == seq) {
3662 		asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3663 		if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3664 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3665 		} else {
3666 			fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3667 			fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3668 			fwdtsn.ch.chunk_flags = 0;
3669 			fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3670 			sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3671 			if (abort_flag) {
3672 				return (1);
3673 			}
3674 			asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3675 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3676 				sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3677 			}
3678 			asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3679 			asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3680 			memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3681 			asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3682 			memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3683 			atomic_add_int(&asoc->sending_seq, 1);
3684 			/* save off historical data for retrans */
3685 			asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3686 			asoc->last_sending_seq[0] = asoc->sending_seq;
3687 			asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3688 			asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3689 			sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3690 			sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3691 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3692 			sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3693 		}
3694 		sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3695 		    asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3696 		asoc->str_reset_seq_in++;
3697 	} else if (asoc->str_reset_seq_in - 1 == seq) {
3698 		sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3699 		    asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3700 	} else if (asoc->str_reset_seq_in - 2 == seq) {
3701 		sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3702 		    asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3703 	} else {
3704 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3705 	}
3706 	return (0);
3707 }
3708 
3709 static void
3710 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3711     struct sctp_tmit_chunk *chk,
3712     struct sctp_stream_reset_out_request *req, int trunc)
3713 {
3714 	uint32_t seq, tsn;
3715 	int number_entries, len;
3716 	struct sctp_association *asoc = &stcb->asoc;
3717 
3718 	seq = ntohl(req->request_seq);
3719 
3720 	/* now if its not a duplicate we process it */
3721 	if (asoc->str_reset_seq_in == seq) {
3722 		len = ntohs(req->ph.param_length);
3723 		number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3724 		/*
3725 		 * the sender is resetting, handle the list issue.. we must
3726 		 * a) verify if we can do the reset, if so no problem b) If
3727 		 * we can't do the reset we must copy the request. c) queue
3728 		 * it, and setup the data in processor to trigger it off
3729 		 * when needed and dequeue all the queued data.
3730 		 */
3731 		tsn = ntohl(req->send_reset_at_tsn);
3732 
3733 		/* move the reset action back one */
3734 		asoc->last_reset_action[1] = asoc->last_reset_action[0];
3735 		if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3736 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3737 		} else if (trunc) {
3738 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3739 		} else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3740 			/* we can do it now */
3741 			sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3742 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3743 		} else {
3744 			/*
3745 			 * we must queue it up and thus wait for the TSN's
3746 			 * to arrive that are at or before tsn
3747 			 */
3748 			struct sctp_stream_reset_list *liste;
3749 			int siz;
3750 
3751 			siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3752 			SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3753 			    siz, SCTP_M_STRESET);
3754 			if (liste == NULL) {
3755 				/* gak out of memory */
3756 				asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3757 				sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3758 				return;
3759 			}
3760 			liste->seq = seq;
3761 			liste->tsn = tsn;
3762 			liste->number_entries = number_entries;
3763 			memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3764 			TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3765 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3766 		}
3767 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3768 		asoc->str_reset_seq_in++;
3769 	} else if ((asoc->str_reset_seq_in - 1) == seq) {
3770 		/*
3771 		 * one seq back, just echo back last action since my
3772 		 * response was lost.
3773 		 */
3774 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3775 	} else if ((asoc->str_reset_seq_in - 2) == seq) {
3776 		/*
3777 		 * two seq back, just echo back last action since my
3778 		 * response was lost.
3779 		 */
3780 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3781 	} else {
3782 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3783 	}
3784 }
3785 
3786 static void
3787 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3788     struct sctp_stream_reset_add_strm *str_add)
3789 {
3790 	/*
3791 	 * Peer is requesting to add more streams. If its within our
3792 	 * max-streams we will allow it.
3793 	 */
3794 	uint32_t num_stream, i;
3795 	uint32_t seq;
3796 	struct sctp_association *asoc = &stcb->asoc;
3797 	struct sctp_queued_to_read *ctl, *nctl;
3798 
3799 	/* Get the number. */
3800 	seq = ntohl(str_add->request_seq);
3801 	num_stream = ntohs(str_add->number_of_streams);
3802 	/* Now what would be the new total? */
3803 	if (asoc->str_reset_seq_in == seq) {
3804 		num_stream += stcb->asoc.streamincnt;
3805 		stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3806 		if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3807 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3808 		} else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3809 		    (num_stream > 0xffff)) {
3810 			/* We must reject it they ask for to many */
3811 	denied:
3812 			stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3813 		} else {
3814 			/* Ok, we can do that :-) */
3815 			struct sctp_stream_in *oldstrm;
3816 
3817 			/* save off the old */
3818 			oldstrm = stcb->asoc.strmin;
3819 			SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3820 			    (num_stream * sizeof(struct sctp_stream_in)),
3821 			    SCTP_M_STRMI);
3822 			if (stcb->asoc.strmin == NULL) {
3823 				stcb->asoc.strmin = oldstrm;
3824 				goto denied;
3825 			}
3826 			/* copy off the old data */
3827 			for (i = 0; i < stcb->asoc.streamincnt; i++) {
3828 				TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3829 				TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3830 				stcb->asoc.strmin[i].sid = i;
3831 				stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
3832 				stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3833 				stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
3834 				/* now anything on those queues? */
3835 				TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
3836 					TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
3837 					TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
3838 				}
3839 				TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
3840 					TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
3841 					TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
3842 				}
3843 			}
3844 			/* Init the new streams */
3845 			for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3846 				TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3847 				TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3848 				stcb->asoc.strmin[i].sid = i;
3849 				stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3850 				stcb->asoc.strmin[i].pd_api_started = 0;
3851 				stcb->asoc.strmin[i].delivery_started = 0;
3852 			}
3853 			SCTP_FREE(oldstrm, SCTP_M_STRMI);
3854 			/* update the size */
3855 			stcb->asoc.streamincnt = num_stream;
3856 			stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3857 			sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3858 		}
3859 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3860 		asoc->str_reset_seq_in++;
3861 	} else if ((asoc->str_reset_seq_in - 1) == seq) {
3862 		/*
3863 		 * one seq back, just echo back last action since my
3864 		 * response was lost.
3865 		 */
3866 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3867 	} else if ((asoc->str_reset_seq_in - 2) == seq) {
3868 		/*
3869 		 * two seq back, just echo back last action since my
3870 		 * response was lost.
3871 		 */
3872 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3873 	} else {
3874 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3875 	}
3876 }
3877 
3878 static void
3879 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3880     struct sctp_stream_reset_add_strm *str_add)
3881 {
3882 	/*
3883 	 * Peer is requesting to add more streams. If its within our
3884 	 * max-streams we will allow it.
3885 	 */
3886 	uint16_t num_stream;
3887 	uint32_t seq;
3888 	struct sctp_association *asoc = &stcb->asoc;
3889 
3890 	/* Get the number. */
3891 	seq = ntohl(str_add->request_seq);
3892 	num_stream = ntohs(str_add->number_of_streams);
3893 	/* Now what would be the new total? */
3894 	if (asoc->str_reset_seq_in == seq) {
3895 		stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3896 		if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3897 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3898 		} else if (stcb->asoc.stream_reset_outstanding) {
3899 			/* We must reject it we have something pending */
3900 			stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3901 		} else {
3902 			/* Ok, we can do that :-) */
3903 			int mychk;
3904 
3905 			mychk = stcb->asoc.streamoutcnt;
3906 			mychk += num_stream;
3907 			if (mychk < 0x10000) {
3908 				stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3909 				if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
3910 					stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3911 				}
3912 			} else {
3913 				stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3914 			}
3915 		}
3916 		sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
3917 		asoc->str_reset_seq_in++;
3918 	} else if ((asoc->str_reset_seq_in - 1) == seq) {
3919 		/*
3920 		 * one seq back, just echo back last action since my
3921 		 * response was lost.
3922 		 */
3923 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3924 	} else if ((asoc->str_reset_seq_in - 2) == seq) {
3925 		/*
3926 		 * two seq back, just echo back last action since my
3927 		 * response was lost.
3928 		 */
3929 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3930 	} else {
3931 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3932 	}
3933 }
3934 
3935 #ifdef __GNUC__
3936 __attribute__((noinline))
3937 #endif
3938 static int
3939 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3940     struct sctp_chunkhdr *ch_req)
3941 {
3942 	uint16_t remaining_length, param_len, ptype;
3943 	struct sctp_paramhdr pstore;
3944 	uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3945 	uint32_t seq = 0;
3946 	int num_req = 0;
3947 	int trunc = 0;
3948 	struct sctp_tmit_chunk *chk;
3949 	struct sctp_chunkhdr *ch;
3950 	struct sctp_paramhdr *ph;
3951 	int ret_code = 0;
3952 	int num_param = 0;
3953 
3954 	/* now it may be a reset or a reset-response */
3955 	remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
3956 
3957 	/* setup for adding the response */
3958 	sctp_alloc_a_chunk(stcb, chk);
3959 	if (chk == NULL) {
3960 		return (ret_code);
3961 	}
3962 	chk->copy_by_ref = 0;
3963 	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3964 	chk->rec.chunk_id.can_take_data = 0;
3965 	chk->flags = 0;
3966 	chk->asoc = &stcb->asoc;
3967 	chk->no_fr_allowed = 0;
3968 	chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3969 	chk->book_size_scale = 0;
3970 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
3971 	if (chk->data == NULL) {
3972 strres_nochunk:
3973 		if (chk->data) {
3974 			sctp_m_freem(chk->data);
3975 			chk->data = NULL;
3976 		}
3977 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3978 		return (ret_code);
3979 	}
3980 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
3981 
3982 	/* setup chunk parameters */
3983 	chk->sent = SCTP_DATAGRAM_UNSENT;
3984 	chk->snd_count = 0;
3985 	chk->whoTo = NULL;
3986 
3987 	ch = mtod(chk->data, struct sctp_chunkhdr *);
3988 	ch->chunk_type = SCTP_STREAM_RESET;
3989 	ch->chunk_flags = 0;
3990 	ch->chunk_length = htons(chk->send_size);
3991 	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
3992 	offset += sizeof(struct sctp_chunkhdr);
3993 	while (remaining_length >= sizeof(struct sctp_paramhdr)) {
3994 		ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
3995 		if (ph == NULL) {
3996 			/* TSNH */
3997 			break;
3998 		}
3999 		param_len = ntohs(ph->param_length);
4000 		if ((param_len > remaining_length) ||
4001 		    (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4002 			/* bad parameter length */
4003 			break;
4004 		}
4005 		ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4006 		    (uint8_t *)&cstore);
4007 		if (ph == NULL) {
4008 			/* TSNH */
4009 			break;
4010 		}
4011 		ptype = ntohs(ph->param_type);
4012 		num_param++;
4013 		if (param_len > sizeof(cstore)) {
4014 			trunc = 1;
4015 		} else {
4016 			trunc = 0;
4017 		}
4018 		if (num_param > SCTP_MAX_RESET_PARAMS) {
4019 			/* hit the max of parameters already sorry.. */
4020 			break;
4021 		}
4022 		if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4023 			struct sctp_stream_reset_out_request *req_out;
4024 
4025 			if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4026 				break;
4027 			}
4028 			req_out = (struct sctp_stream_reset_out_request *)ph;
4029 			num_req++;
4030 			if (stcb->asoc.stream_reset_outstanding) {
4031 				seq = ntohl(req_out->response_seq);
4032 				if (seq == stcb->asoc.str_reset_seq_out) {
4033 					/* implicit ack */
4034 					(void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4035 				}
4036 			}
4037 			sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4038 		} else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4039 			struct sctp_stream_reset_add_strm *str_add;
4040 
4041 			if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4042 				break;
4043 			}
4044 			str_add = (struct sctp_stream_reset_add_strm *)ph;
4045 			num_req++;
4046 			sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4047 		} else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4048 			struct sctp_stream_reset_add_strm *str_add;
4049 
4050 			if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4051 				break;
4052 			}
4053 			str_add = (struct sctp_stream_reset_add_strm *)ph;
4054 			num_req++;
4055 			sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4056 		} else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4057 			struct sctp_stream_reset_in_request *req_in;
4058 
4059 			num_req++;
4060 			req_in = (struct sctp_stream_reset_in_request *)ph;
4061 			sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4062 		} else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4063 			struct sctp_stream_reset_tsn_request *req_tsn;
4064 
4065 			num_req++;
4066 			req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4067 			if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4068 				ret_code = 1;
4069 				goto strres_nochunk;
4070 			}
4071 			/* no more */
4072 			break;
4073 		} else if (ptype == SCTP_STR_RESET_RESPONSE) {
4074 			struct sctp_stream_reset_response *resp;
4075 			uint32_t result;
4076 
4077 			if (param_len < sizeof(struct sctp_stream_reset_response)) {
4078 				break;
4079 			}
4080 			resp = (struct sctp_stream_reset_response *)ph;
4081 			seq = ntohl(resp->response_seq);
4082 			result = ntohl(resp->result);
4083 			if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4084 				ret_code = 1;
4085 				goto strres_nochunk;
4086 			}
4087 		} else {
4088 			break;
4089 		}
4090 		offset += SCTP_SIZE32(param_len);
4091 		if (remaining_length >= SCTP_SIZE32(param_len)) {
4092 			remaining_length -= SCTP_SIZE32(param_len);
4093 		} else {
4094 			remaining_length = 0;
4095 		}
4096 	}
4097 	if (num_req == 0) {
4098 		/* we have no response free the stuff */
4099 		goto strres_nochunk;
4100 	}
4101 	/* ok we have a chunk to link in */
4102 	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4103 	    chk,
4104 	    sctp_next);
4105 	stcb->asoc.ctrl_queue_cnt++;
4106 	return (ret_code);
4107 }
4108 
4109 /*
4110  * Handle a router or endpoints report of a packet loss, there are two ways
4111  * to handle this, either we get the whole packet and must disect it
4112  * ourselves (possibly with truncation and or corruption) or it is a summary
4113  * from a middle box that did the disectting for us.
4114  */
4115 static void
4116 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4117     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4118 {
4119 	struct sctp_chunk_desc desc;
4120 	struct sctp_chunkhdr *chk_hdr;
4121 	struct sctp_data_chunk *data_chunk;
4122 	struct sctp_idata_chunk *idata_chunk;
4123 	uint32_t bottle_bw, on_queue;
4124 	uint32_t offset, chk_len;
4125 	uint16_t trunc_len;
4126 	uint16_t pktdrp_len;
4127 	uint8_t pktdrp_flags;
4128 
4129 	KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
4130 	    ("PKTDROP chunk too small"));
4131 	pktdrp_flags = cp->ch.chunk_flags;
4132 	pktdrp_len = ntohs(cp->ch.chunk_length);
4133 	KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
4134 	if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
4135 		trunc_len = ntohs(cp->trunc_len);
4136 		if (trunc_len <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
4137 			/* The peer plays games with us. */
4138 			return;
4139 		}
4140 	} else {
4141 		trunc_len = 0;
4142 	}
4143 	limit -= sizeof(struct sctp_pktdrop_chunk);
4144 	offset = 0;
4145 	if (offset == limit) {
4146 		if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4147 			SCTP_STAT_INCR(sctps_pdrpbwrpt);
4148 		}
4149 	} else if (offset + sizeof(struct sctphdr) > limit) {
4150 		/* Only a partial SCTP common header. */
4151 		SCTP_STAT_INCR(sctps_pdrpcrupt);
4152 		offset = limit;
4153 	} else {
4154 		/* XXX: Check embedded SCTP common header. */
4155 		offset += sizeof(struct sctphdr);
4156 	}
4157 	/* Now parse through the chunks themselves. */
4158 	while (offset < limit) {
4159 		if (offset + sizeof(struct sctp_chunkhdr) > limit) {
4160 			SCTP_STAT_INCR(sctps_pdrpcrupt);
4161 			break;
4162 		}
4163 		chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
4164 		desc.chunk_type = chk_hdr->chunk_type;
4165 		/* get amount we need to move */
4166 		chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
4167 		if (chk_len < sizeof(struct sctp_chunkhdr)) {
4168 			/* Someone is lying... */
4169 			break;
4170 		}
4171 		if (desc.chunk_type == SCTP_DATA) {
4172 			if (stcb->asoc.idata_supported) {
4173 				/* Some is playing games with us. */
4174 				break;
4175 			}
4176 			if (chk_len <= sizeof(struct sctp_data_chunk)) {
4177 				/* Some is playing games with us. */
4178 				break;
4179 			}
4180 			if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4181 				/*
4182 				 * Not enough data bytes available in the
4183 				 * chunk.
4184 				 */
4185 				SCTP_STAT_INCR(sctps_pdrpnedat);
4186 				goto next_chunk;
4187 			}
4188 			if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4189 				/* Not enough data in buffer. */
4190 				break;
4191 			}
4192 			data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
4193 			memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4194 			desc.tsn_ifany = data_chunk->dp.tsn;
4195 			if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4196 				SCTP_STAT_INCR(sctps_pdrpmbda);
4197 			}
4198 		} else if (desc.chunk_type == SCTP_IDATA) {
4199 			if (!stcb->asoc.idata_supported) {
4200 				/* Some is playing games with us. */
4201 				break;
4202 			}
4203 			if (chk_len <= sizeof(struct sctp_idata_chunk)) {
4204 				/* Some is playing games with us. */
4205 				break;
4206 			}
4207 			if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4208 				/*
4209 				 * Not enough data bytes available in the
4210 				 * chunk.
4211 				 */
4212 				SCTP_STAT_INCR(sctps_pdrpnedat);
4213 				goto next_chunk;
4214 			}
4215 			if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4216 				/* Not enough data in buffer. */
4217 				break;
4218 			}
4219 			idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
4220 			memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4221 			desc.tsn_ifany = idata_chunk->dp.tsn;
4222 			if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4223 				SCTP_STAT_INCR(sctps_pdrpmbda);
4224 			}
4225 		} else {
4226 			if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4227 				SCTP_STAT_INCR(sctps_pdrpmbct);
4228 			}
4229 		}
4230 		if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
4231 			SCTP_STAT_INCR(sctps_pdrppdbrk);
4232 			break;
4233 		}
4234 next_chunk:
4235 		offset += SCTP_SIZE32(chk_len);
4236 	}
4237 	/* Now update any rwnd --- possibly */
4238 	if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4239 		/* From a peer, we get a rwnd report */
4240 		uint32_t a_rwnd;
4241 
4242 		SCTP_STAT_INCR(sctps_pdrpfehos);
4243 
4244 		bottle_bw = ntohl(cp->bottle_bw);
4245 		on_queue = ntohl(cp->current_onq);
4246 		if (bottle_bw && on_queue) {
4247 			/* a rwnd report is in here */
4248 			if (bottle_bw > on_queue)
4249 				a_rwnd = bottle_bw - on_queue;
4250 			else
4251 				a_rwnd = 0;
4252 
4253 			if (a_rwnd == 0)
4254 				stcb->asoc.peers_rwnd = 0;
4255 			else {
4256 				if (a_rwnd > stcb->asoc.total_flight) {
4257 					stcb->asoc.peers_rwnd =
4258 					    a_rwnd - stcb->asoc.total_flight;
4259 				} else {
4260 					stcb->asoc.peers_rwnd = 0;
4261 				}
4262 				if (stcb->asoc.peers_rwnd <
4263 				    stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4264 					/* SWS sender side engages */
4265 					stcb->asoc.peers_rwnd = 0;
4266 				}
4267 			}
4268 		}
4269 	} else {
4270 		SCTP_STAT_INCR(sctps_pdrpfmbox);
4271 	}
4272 
4273 	/* now middle boxes in sat networks get a cwnd bump */
4274 	if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
4275 	    (stcb->asoc.sat_t3_loss_recovery == 0) &&
4276 	    (stcb->asoc.sat_network)) {
4277 		/*
4278 		 * This is debatable but for sat networks it makes sense
4279 		 * Note if a T3 timer has went off, we will prohibit any
4280 		 * changes to cwnd until we exit the t3 loss recovery.
4281 		 */
4282 		stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4283 		    net, cp, &bottle_bw, &on_queue);
4284 	}
4285 }
4286 
4287 /*
4288  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4289  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4290  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4291  * length of the complete packet outputs: - length: modified to remaining
4292  * length after control processing - netp: modified to new sctp_nets after
4293  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4294  * bad packet,...) otherwise return the tcb for this packet
4295  */
4296 #ifdef __GNUC__
4297 __attribute__((noinline))
4298 #endif
4299 static struct sctp_tcb *
4300 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4301     struct sockaddr *src, struct sockaddr *dst,
4302     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4303     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4304     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4305     uint32_t vrf_id, uint16_t port)
4306 {
4307 	struct sctp_association *asoc;
4308 	struct mbuf *op_err;
4309 	char msg[SCTP_DIAG_INFO_LEN];
4310 	uint32_t vtag_in;
4311 	int num_chunks = 0;	/* number of control chunks processed */
4312 	uint32_t chk_length, contiguous;
4313 	int ret;
4314 	int abort_no_unlock = 0;
4315 	int ecne_seen = 0;
4316 
4317 	/*
4318 	 * How big should this be, and should it be alloc'd? Lets try the
4319 	 * d-mtu-ceiling for now (2k) and that should hopefully work ...
4320 	 * until we get into jumbo grams and such..
4321 	 */
4322 	uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4323 	int got_auth = 0;
4324 	uint32_t auth_offset = 0, auth_len = 0;
4325 	int auth_skipped = 0;
4326 	int asconf_cnt = 0;
4327 
4328 	SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4329 	    iphlen, *offset, length, (void *)stcb);
4330 
4331 	if (stcb) {
4332 		SCTP_TCB_LOCK_ASSERT(stcb);
4333 	}
4334 	/* validate chunk header length... */
4335 	if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4336 		SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4337 		    ntohs(ch->chunk_length));
4338 		*offset = length;
4339 		return (stcb);
4340 	}
4341 	/*
4342 	 * validate the verification tag
4343 	 */
4344 	vtag_in = ntohl(sh->v_tag);
4345 
4346 	if (ch->chunk_type == SCTP_INITIATION) {
4347 		SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4348 		    ntohs(ch->chunk_length), vtag_in);
4349 		if (vtag_in != 0) {
4350 			/* protocol error- silently discard... */
4351 			SCTP_STAT_INCR(sctps_badvtag);
4352 			if (stcb != NULL) {
4353 				SCTP_TCB_UNLOCK(stcb);
4354 			}
4355 			return (NULL);
4356 		}
4357 	} else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4358 		/*
4359 		 * If there is no stcb, skip the AUTH chunk and process
4360 		 * later after a stcb is found (to validate the lookup was
4361 		 * valid.
4362 		 */
4363 		if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4364 		    (stcb == NULL) &&
4365 		    (inp->auth_supported == 1)) {
4366 			/* save this chunk for later processing */
4367 			auth_skipped = 1;
4368 			auth_offset = *offset;
4369 			auth_len = ntohs(ch->chunk_length);
4370 
4371 			/* (temporarily) move past this chunk */
4372 			*offset += SCTP_SIZE32(auth_len);
4373 			if (*offset >= length) {
4374 				/* no more data left in the mbuf chain */
4375 				*offset = length;
4376 				return (NULL);
4377 			}
4378 			ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4379 			    sizeof(struct sctp_chunkhdr), chunk_buf);
4380 		}
4381 		if (ch == NULL) {
4382 			/* Help */
4383 			*offset = length;
4384 			return (stcb);
4385 		}
4386 		if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4387 			goto process_control_chunks;
4388 		}
4389 		/*
4390 		 * first check if it's an ASCONF with an unknown src addr we
4391 		 * need to look inside to find the association
4392 		 */
4393 		if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4394 			struct sctp_chunkhdr *asconf_ch = ch;
4395 			uint32_t asconf_offset = 0, asconf_len = 0;
4396 
4397 			/* inp's refcount may be reduced */
4398 			SCTP_INP_INCR_REF(inp);
4399 
4400 			asconf_offset = *offset;
4401 			do {
4402 				asconf_len = ntohs(asconf_ch->chunk_length);
4403 				if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4404 					break;
4405 				stcb = sctp_findassociation_ep_asconf(m,
4406 				    *offset,
4407 				    dst,
4408 				    sh, &inp, netp, vrf_id);
4409 				if (stcb != NULL)
4410 					break;
4411 				asconf_offset += SCTP_SIZE32(asconf_len);
4412 				asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4413 				    sizeof(struct sctp_chunkhdr), chunk_buf);
4414 			} while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4415 			if (stcb == NULL) {
4416 				/*
4417 				 * reduce inp's refcount if not reduced in
4418 				 * sctp_findassociation_ep_asconf().
4419 				 */
4420 				SCTP_INP_DECR_REF(inp);
4421 			}
4422 
4423 			/* now go back and verify any auth chunk to be sure */
4424 			if (auth_skipped && (stcb != NULL)) {
4425 				struct sctp_auth_chunk *auth;
4426 
4427 				if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
4428 					auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
4429 					got_auth = 1;
4430 					auth_skipped = 0;
4431 				} else {
4432 					auth = NULL;
4433 				}
4434 				if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4435 				    auth_offset)) {
4436 					/* auth HMAC failed so dump it */
4437 					*offset = length;
4438 					return (stcb);
4439 				} else {
4440 					/* remaining chunks are HMAC checked */
4441 					stcb->asoc.authenticated = 1;
4442 				}
4443 			}
4444 		}
4445 		if (stcb == NULL) {
4446 			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4447 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4448 			    msg);
4449 			/* no association, so it's out of the blue... */
4450 			sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4451 			    mflowtype, mflowid, inp->fibnum,
4452 			    vrf_id, port);
4453 			*offset = length;
4454 			return (NULL);
4455 		}
4456 		asoc = &stcb->asoc;
4457 		/* ABORT and SHUTDOWN can use either v_tag... */
4458 		if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4459 		    (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4460 		    (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4461 			/* Take the T-bit always into account. */
4462 			if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4463 			    (vtag_in == asoc->my_vtag)) ||
4464 			    (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4465 			    (asoc->peer_vtag != htonl(0)) &&
4466 			    (vtag_in == asoc->peer_vtag))) {
4467 				/* this is valid */
4468 			} else {
4469 				/* drop this packet... */
4470 				SCTP_STAT_INCR(sctps_badvtag);
4471 				if (stcb != NULL) {
4472 					SCTP_TCB_UNLOCK(stcb);
4473 				}
4474 				return (NULL);
4475 			}
4476 		} else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4477 			if (vtag_in != asoc->my_vtag) {
4478 				/*
4479 				 * this could be a stale SHUTDOWN-ACK or the
4480 				 * peer never got the SHUTDOWN-COMPLETE and
4481 				 * is still hung; we have started a new asoc
4482 				 * but it won't complete until the shutdown
4483 				 * is completed
4484 				 */
4485 				if (stcb != NULL) {
4486 					SCTP_TCB_UNLOCK(stcb);
4487 				}
4488 				SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4489 				op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4490 				    msg);
4491 				sctp_handle_ootb(m, iphlen, *offset, src, dst,
4492 				    sh, inp, op_err,
4493 				    mflowtype, mflowid, fibnum,
4494 				    vrf_id, port);
4495 				return (NULL);
4496 			}
4497 		} else {
4498 			/* for all other chunks, vtag must match */
4499 			if (vtag_in != asoc->my_vtag) {
4500 				/* invalid vtag... */
4501 				SCTPDBG(SCTP_DEBUG_INPUT3,
4502 				    "invalid vtag: %xh, expect %xh\n",
4503 				    vtag_in, asoc->my_vtag);
4504 				SCTP_STAT_INCR(sctps_badvtag);
4505 				if (stcb != NULL) {
4506 					SCTP_TCB_UNLOCK(stcb);
4507 				}
4508 				*offset = length;
4509 				return (NULL);
4510 			}
4511 		}
4512 	}			/* end if !SCTP_COOKIE_ECHO */
4513 	/*
4514 	 * process all control chunks...
4515 	 */
4516 	if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4517 	    (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4518 	    (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4519 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4520 		/* implied cookie-ack.. we must have lost the ack */
4521 		sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4522 		    *netp);
4523 	}
4524 
4525 process_control_chunks:
4526 	while (IS_SCTP_CONTROL(ch)) {
4527 		/* validate chunk length */
4528 		chk_length = ntohs(ch->chunk_length);
4529 		SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4530 		    ch->chunk_type, chk_length);
4531 		SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4532 		if (chk_length < sizeof(*ch) ||
4533 		    (*offset + (int)chk_length) > length) {
4534 			*offset = length;
4535 			return (stcb);
4536 		}
4537 		SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4538 		/*
4539 		 * INIT and INIT-ACK only gets the init ack "header" portion
4540 		 * only because we don't have to process the peer's COOKIE.
4541 		 * All others get a complete chunk.
4542 		 */
4543 		switch (ch->chunk_type) {
4544 		case SCTP_INITIATION:
4545 			contiguous = sizeof(struct sctp_init_chunk);
4546 			break;
4547 		case SCTP_INITIATION_ACK:
4548 			contiguous = sizeof(struct sctp_init_ack_chunk);
4549 			break;
4550 		default:
4551 			contiguous = min(chk_length, sizeof(chunk_buf));
4552 			break;
4553 		}
4554 		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4555 		    contiguous,
4556 		    chunk_buf);
4557 		if (ch == NULL) {
4558 			*offset = length;
4559 			if (stcb != NULL) {
4560 				SCTP_TCB_UNLOCK(stcb);
4561 			}
4562 			return (NULL);
4563 		}
4564 
4565 		num_chunks++;
4566 		/* Save off the last place we got a control from */
4567 		if (stcb != NULL) {
4568 			if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4569 				/*
4570 				 * allow last_control to be NULL if
4571 				 * ASCONF... ASCONF processing will find the
4572 				 * right net later
4573 				 */
4574 				if ((netp != NULL) && (*netp != NULL))
4575 					stcb->asoc.last_control_chunk_from = *netp;
4576 			}
4577 		}
4578 #ifdef SCTP_AUDITING_ENABLED
4579 		sctp_audit_log(0xB0, ch->chunk_type);
4580 #endif
4581 
4582 		/* check to see if this chunk required auth, but isn't */
4583 		if ((stcb != NULL) &&
4584 		    sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4585 		    !stcb->asoc.authenticated) {
4586 			/* "silently" ignore */
4587 			SCTP_STAT_INCR(sctps_recvauthmissing);
4588 			goto next_chunk;
4589 		}
4590 		switch (ch->chunk_type) {
4591 		case SCTP_INITIATION:
4592 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4593 			/* The INIT chunk must be the only chunk. */
4594 			if ((num_chunks > 1) ||
4595 			    (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4596 				/* RFC 4960 requires that no ABORT is sent */
4597 				*offset = length;
4598 				if (stcb != NULL) {
4599 					SCTP_TCB_UNLOCK(stcb);
4600 				}
4601 				return (NULL);
4602 			}
4603 			/* Honor our resource limit. */
4604 			if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4605 				op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4606 				sctp_abort_association(inp, stcb, m, iphlen,
4607 				    src, dst, sh, op_err,
4608 				    mflowtype, mflowid,
4609 				    vrf_id, port);
4610 				*offset = length;
4611 				return (NULL);
4612 			}
4613 			sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4614 			    (struct sctp_init_chunk *)ch, inp,
4615 			    stcb, *netp, &abort_no_unlock,
4616 			    mflowtype, mflowid,
4617 			    vrf_id, port);
4618 			*offset = length;
4619 			if ((!abort_no_unlock) && (stcb != NULL)) {
4620 				SCTP_TCB_UNLOCK(stcb);
4621 			}
4622 			return (NULL);
4623 			break;
4624 		case SCTP_PAD_CHUNK:
4625 			break;
4626 		case SCTP_INITIATION_ACK:
4627 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4628 			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4629 				/* We are not interested anymore */
4630 				if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4631 					;
4632 				} else {
4633 					*offset = length;
4634 					if (stcb != NULL) {
4635 						(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4636 						    SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4637 					}
4638 					return (NULL);
4639 				}
4640 			}
4641 			/* The INIT-ACK chunk must be the only chunk. */
4642 			if ((num_chunks > 1) ||
4643 			    (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4644 				*offset = length;
4645 				return (stcb);
4646 			}
4647 			if ((netp != NULL) && (*netp != NULL)) {
4648 				ret = sctp_handle_init_ack(m, iphlen, *offset,
4649 				    src, dst, sh,
4650 				    (struct sctp_init_ack_chunk *)ch,
4651 				    stcb, *netp,
4652 				    &abort_no_unlock,
4653 				    mflowtype, mflowid,
4654 				    vrf_id);
4655 			} else {
4656 				ret = -1;
4657 			}
4658 			*offset = length;
4659 			if (abort_no_unlock) {
4660 				return (NULL);
4661 			}
4662 			/*
4663 			 * Special case, I must call the output routine to
4664 			 * get the cookie echoed
4665 			 */
4666 			if ((stcb != NULL) && (ret == 0)) {
4667 				sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4668 			}
4669 			return (stcb);
4670 			break;
4671 		case SCTP_SELECTIVE_ACK:
4672 		case SCTP_NR_SELECTIVE_ACK:
4673 			{
4674 				int abort_now = 0;
4675 				uint32_t a_rwnd, cum_ack;
4676 				uint16_t num_seg, num_nr_seg, num_dup;
4677 				uint8_t flags;
4678 				int offset_seg, offset_dup;
4679 
4680 				SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4681 				    ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4682 				SCTP_STAT_INCR(sctps_recvsacks);
4683 				if (stcb == NULL) {
4684 					SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4685 					    (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4686 					break;
4687 				}
4688 				if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4689 					if (chk_length < sizeof(struct sctp_sack_chunk)) {
4690 						SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4691 						break;
4692 					}
4693 				} else {
4694 					if (stcb->asoc.nrsack_supported == 0) {
4695 						goto unknown_chunk;
4696 					}
4697 					if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4698 						SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4699 						break;
4700 					}
4701 				}
4702 				if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4703 					/*-
4704 					 * If we have sent a shutdown-ack, we will pay no
4705 					 * attention to a sack sent in to us since
4706 					 * we don't care anymore.
4707 					 */
4708 					break;
4709 				}
4710 				flags = ch->chunk_flags;
4711 				if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4712 					struct sctp_sack_chunk *sack;
4713 
4714 					sack = (struct sctp_sack_chunk *)ch;
4715 					cum_ack = ntohl(sack->sack.cum_tsn_ack);
4716 					num_seg = ntohs(sack->sack.num_gap_ack_blks);
4717 					num_nr_seg = 0;
4718 					num_dup = ntohs(sack->sack.num_dup_tsns);
4719 					a_rwnd = ntohl(sack->sack.a_rwnd);
4720 					if (sizeof(struct sctp_sack_chunk) +
4721 					    num_seg * sizeof(struct sctp_gap_ack_block) +
4722 					    num_dup * sizeof(uint32_t) != chk_length) {
4723 						SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4724 						break;
4725 					}
4726 					offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4727 					offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4728 				} else {
4729 					struct sctp_nr_sack_chunk *nr_sack;
4730 
4731 					nr_sack = (struct sctp_nr_sack_chunk *)ch;
4732 					cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4733 					num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4734 					num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4735 					num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4736 					a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4737 					if (sizeof(struct sctp_nr_sack_chunk) +
4738 					    (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4739 					    num_dup * sizeof(uint32_t) != chk_length) {
4740 						SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4741 						break;
4742 					}
4743 					offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4744 					offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4745 				}
4746 				SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4747 				    (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4748 				    cum_ack, num_seg, a_rwnd);
4749 				stcb->asoc.seen_a_sack_this_pkt = 1;
4750 				if ((stcb->asoc.pr_sctp_cnt == 0) &&
4751 				    (num_seg == 0) && (num_nr_seg == 0) &&
4752 				    SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4753 				    (stcb->asoc.saw_sack_with_frags == 0) &&
4754 				    (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4755 				    (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4756 					/*
4757 					 * We have a SIMPLE sack having no
4758 					 * prior segments and data on sent
4759 					 * queue to be acked. Use the faster
4760 					 * path sack processing. We also
4761 					 * allow window update sacks with no
4762 					 * missing segments to go this way
4763 					 * too.
4764 					 */
4765 					sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4766 					    &abort_now, ecne_seen);
4767 				} else {
4768 					if ((netp != NULL) && (*netp != NULL)) {
4769 						sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4770 						    num_seg, num_nr_seg, num_dup, &abort_now, flags,
4771 						    cum_ack, a_rwnd, ecne_seen);
4772 					}
4773 				}
4774 				if (abort_now) {
4775 					/* ABORT signal from sack processing */
4776 					*offset = length;
4777 					return (NULL);
4778 				}
4779 				if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4780 				    TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4781 				    (stcb->asoc.stream_queue_cnt == 0)) {
4782 					sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4783 				}
4784 				break;
4785 			}
4786 		case SCTP_HEARTBEAT_REQUEST:
4787 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4788 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4789 				SCTP_STAT_INCR(sctps_recvheartbeat);
4790 				sctp_send_heartbeat_ack(stcb, m, *offset,
4791 				    chk_length, *netp);
4792 			}
4793 			break;
4794 		case SCTP_HEARTBEAT_ACK:
4795 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
4796 			if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4797 				/* Its not ours */
4798 				*offset = length;
4799 				return (stcb);
4800 			}
4801 			SCTP_STAT_INCR(sctps_recvheartbeatack);
4802 			if ((netp != NULL) && (*netp != NULL)) {
4803 				sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4804 				    stcb, *netp);
4805 			}
4806 			break;
4807 		case SCTP_ABORT_ASSOCIATION:
4808 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4809 			    (void *)stcb);
4810 			*offset = length;
4811 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4812 				if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
4813 					return (NULL);
4814 				} else {
4815 					return (stcb);
4816 				}
4817 			} else {
4818 				return (NULL);
4819 			}
4820 			break;
4821 		case SCTP_SHUTDOWN:
4822 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4823 			    (void *)stcb);
4824 			if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4825 				*offset = length;
4826 				return (stcb);
4827 			}
4828 			if ((netp != NULL) && (*netp != NULL)) {
4829 				int abort_flag = 0;
4830 
4831 				sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4832 				    stcb, *netp, &abort_flag);
4833 				if (abort_flag) {
4834 					*offset = length;
4835 					return (NULL);
4836 				}
4837 			}
4838 			break;
4839 		case SCTP_SHUTDOWN_ACK:
4840 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
4841 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4842 				sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4843 			}
4844 			*offset = length;
4845 			return (NULL);
4846 			break;
4847 		case SCTP_OPERATION_ERROR:
4848 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
4849 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
4850 			    sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
4851 				*offset = length;
4852 				return (NULL);
4853 			}
4854 			break;
4855 		case SCTP_COOKIE_ECHO:
4856 			SCTPDBG(SCTP_DEBUG_INPUT3,
4857 			    "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
4858 			if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
4859 				;
4860 			} else {
4861 				if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4862 					/* We are not interested anymore */
4863 			abend:
4864 					if (stcb != NULL) {
4865 						SCTP_TCB_UNLOCK(stcb);
4866 					}
4867 					*offset = length;
4868 					return (NULL);
4869 				}
4870 			}
4871 			/*-
4872 			 * First are we accepting? We do this again here
4873 			 * since it is possible that a previous endpoint WAS
4874 			 * listening responded to a INIT-ACK and then
4875 			 * closed. We opened and bound.. and are now no
4876 			 * longer listening.
4877 			 *
4878 			 * XXXGL: notes on checking listen queue length.
4879 			 * 1) SCTP_IS_LISTENING() doesn't necessarily mean
4880 			 *    SOLISTENING(), because a listening "UDP type"
4881 			 *    socket isn't listening in terms of the socket
4882 			 *    layer.  It is a normal data flow socket, that
4883 			 *    can fork off new connections.  Thus, we should
4884 			 *    look into sol_qlen only in case we are !UDP.
4885 			 * 2) Checking sol_qlen in general requires locking
4886 			 *    the socket, and this code lacks that.
4887 			 */
4888 			if ((stcb == NULL) &&
4889 			    (!SCTP_IS_LISTENING(inp) ||
4890 			    (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
4891 			    inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
4892 				if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4893 				    (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4894 					op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4895 					sctp_abort_association(inp, stcb, m, iphlen,
4896 					    src, dst, sh, op_err,
4897 					    mflowtype, mflowid,
4898 					    vrf_id, port);
4899 				}
4900 				*offset = length;
4901 				return (NULL);
4902 			} else {
4903 				struct mbuf *ret_buf;
4904 				struct sctp_inpcb *linp;
4905 				struct sctp_tmit_chunk *chk;
4906 
4907 				if (stcb) {
4908 					linp = NULL;
4909 				} else {
4910 					linp = inp;
4911 				}
4912 
4913 				if (linp != NULL) {
4914 					SCTP_ASOC_CREATE_LOCK(linp);
4915 					if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
4916 					    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4917 						SCTP_ASOC_CREATE_UNLOCK(linp);
4918 						goto abend;
4919 					}
4920 				}
4921 
4922 				if (netp != NULL) {
4923 					struct sctp_tcb *locked_stcb;
4924 
4925 					locked_stcb = stcb;
4926 					ret_buf =
4927 					    sctp_handle_cookie_echo(m, iphlen,
4928 					    *offset,
4929 					    src, dst,
4930 					    sh,
4931 					    (struct sctp_cookie_echo_chunk *)ch,
4932 					    &inp, &stcb, netp,
4933 					    auth_skipped,
4934 					    auth_offset,
4935 					    auth_len,
4936 					    &locked_stcb,
4937 					    mflowtype,
4938 					    mflowid,
4939 					    vrf_id,
4940 					    port);
4941 					if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
4942 						SCTP_TCB_UNLOCK(locked_stcb);
4943 					}
4944 					if (stcb != NULL) {
4945 						SCTP_TCB_LOCK_ASSERT(stcb);
4946 					}
4947 				} else {
4948 					ret_buf = NULL;
4949 				}
4950 				if (linp != NULL) {
4951 					SCTP_ASOC_CREATE_UNLOCK(linp);
4952 				}
4953 				if (ret_buf == NULL) {
4954 					if (stcb != NULL) {
4955 						SCTP_TCB_UNLOCK(stcb);
4956 					}
4957 					SCTPDBG(SCTP_DEBUG_INPUT3,
4958 					    "GAK, null buffer\n");
4959 					*offset = length;
4960 					return (NULL);
4961 				}
4962 				/* if AUTH skipped, see if it verified... */
4963 				if (auth_skipped) {
4964 					got_auth = 1;
4965 					auth_skipped = 0;
4966 				}
4967 				/* Restart the timer if we have pending data */
4968 				TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
4969 					if (chk->whoTo != NULL) {
4970 						break;
4971 					}
4972 				}
4973 				if (chk != NULL) {
4974 					sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
4975 				}
4976 			}
4977 			break;
4978 		case SCTP_COOKIE_ACK:
4979 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
4980 			if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
4981 				return (stcb);
4982 			}
4983 			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4984 				/* We are not interested anymore */
4985 				if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4986 					;
4987 				} else if (stcb) {
4988 					(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4989 					    SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
4990 					*offset = length;
4991 					return (NULL);
4992 				}
4993 			}
4994 			if ((netp != NULL) && (*netp != NULL)) {
4995 				sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
4996 			}
4997 			break;
4998 		case SCTP_ECN_ECHO:
4999 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5000 			if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5001 				/* Its not ours */
5002 				*offset = length;
5003 				return (stcb);
5004 			}
5005 			if (stcb->asoc.ecn_supported == 0) {
5006 				goto unknown_chunk;
5007 			}
5008 			sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5009 			ecne_seen = 1;
5010 			break;
5011 		case SCTP_ECN_CWR:
5012 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5013 			if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5014 				*offset = length;
5015 				return (stcb);
5016 			}
5017 			if (stcb->asoc.ecn_supported == 0) {
5018 				goto unknown_chunk;
5019 			}
5020 			sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5021 			break;
5022 		case SCTP_SHUTDOWN_COMPLETE:
5023 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5024 			/* must be first and only chunk */
5025 			if ((num_chunks > 1) ||
5026 			    (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5027 				*offset = length;
5028 				return (stcb);
5029 			}
5030 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5031 				sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5032 				    stcb, *netp);
5033 			}
5034 			*offset = length;
5035 			return (NULL);
5036 			break;
5037 		case SCTP_ASCONF:
5038 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5039 			if (stcb != NULL) {
5040 				if (stcb->asoc.asconf_supported == 0) {
5041 					goto unknown_chunk;
5042 				}
5043 				sctp_handle_asconf(m, *offset, src,
5044 				    (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5045 				asconf_cnt++;
5046 			}
5047 			break;
5048 		case SCTP_ASCONF_ACK:
5049 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5050 			if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5051 				/* Its not ours */
5052 				*offset = length;
5053 				return (stcb);
5054 			}
5055 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5056 				if (stcb->asoc.asconf_supported == 0) {
5057 					goto unknown_chunk;
5058 				}
5059 				/* He's alive so give him credit */
5060 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5061 					sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5062 					    stcb->asoc.overall_error_count,
5063 					    0,
5064 					    SCTP_FROM_SCTP_INPUT,
5065 					    __LINE__);
5066 				}
5067 				stcb->asoc.overall_error_count = 0;
5068 				sctp_handle_asconf_ack(m, *offset,
5069 				    (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5070 				if (abort_no_unlock)
5071 					return (NULL);
5072 			}
5073 			break;
5074 		case SCTP_FORWARD_CUM_TSN:
5075 		case SCTP_IFORWARD_CUM_TSN:
5076 			SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5077 			    ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
5078 			if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5079 				/* Its not ours */
5080 				*offset = length;
5081 				return (stcb);
5082 			}
5083 
5084 			if (stcb != NULL) {
5085 				int abort_flag = 0;
5086 
5087 				if (stcb->asoc.prsctp_supported == 0) {
5088 					goto unknown_chunk;
5089 				}
5090 				if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
5091 				    ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
5092 					if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
5093 						SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
5094 					} else {
5095 						SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
5096 					}
5097 					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5098 					sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
5099 					*offset = length;
5100 					return (NULL);
5101 				}
5102 				*fwd_tsn_seen = 1;
5103 				if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5104 					/* We are not interested anymore */
5105 					(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5106 					    SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5107 					*offset = length;
5108 					return (NULL);
5109 				}
5110 				/*
5111 				 * For sending a SACK this looks like DATA
5112 				 * chunks.
5113 				 */
5114 				stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5115 				sctp_handle_forward_tsn(stcb,
5116 				    (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5117 				if (abort_flag) {
5118 					*offset = length;
5119 					return (NULL);
5120 				}
5121 			}
5122 			break;
5123 		case SCTP_STREAM_RESET:
5124 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5125 			if ((stcb == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req))) {
5126 				/* Its not ours */
5127 				*offset = length;
5128 				return (stcb);
5129 			}
5130 			if (stcb->asoc.reconfig_supported == 0) {
5131 				goto unknown_chunk;
5132 			}
5133 			if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5134 				/* stop processing */
5135 				*offset = length;
5136 				return (NULL);
5137 			}
5138 			break;
5139 		case SCTP_PACKET_DROPPED:
5140 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5141 			/* re-get it all please */
5142 			if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5143 				/* Its not ours */
5144 				*offset = length;
5145 				return (stcb);
5146 			}
5147 
5148 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5149 				if (stcb->asoc.pktdrop_supported == 0) {
5150 					goto unknown_chunk;
5151 				}
5152 				sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5153 				    stcb, *netp,
5154 				    min(chk_length, contiguous));
5155 			}
5156 			break;
5157 		case SCTP_AUTHENTICATION:
5158 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5159 			if (stcb == NULL) {
5160 				/* save the first AUTH for later processing */
5161 				if (auth_skipped == 0) {
5162 					auth_offset = *offset;
5163 					auth_len = chk_length;
5164 					auth_skipped = 1;
5165 				}
5166 				/* skip this chunk (temporarily) */
5167 				goto next_chunk;
5168 			}
5169 			if (stcb->asoc.auth_supported == 0) {
5170 				goto unknown_chunk;
5171 			}
5172 			if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5173 			    (chk_length > (sizeof(struct sctp_auth_chunk) +
5174 			    SCTP_AUTH_DIGEST_LEN_MAX))) {
5175 				/* Its not ours */
5176 				*offset = length;
5177 				return (stcb);
5178 			}
5179 			if (got_auth == 1) {
5180 				/* skip this chunk... it's already auth'd */
5181 				goto next_chunk;
5182 			}
5183 			got_auth = 1;
5184 			if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
5185 				/* auth HMAC failed so dump the packet */
5186 				*offset = length;
5187 				return (stcb);
5188 			} else {
5189 				/* remaining chunks are HMAC checked */
5190 				stcb->asoc.authenticated = 1;
5191 			}
5192 			break;
5193 
5194 		default:
5195 	unknown_chunk:
5196 			/* it's an unknown chunk! */
5197 			if ((ch->chunk_type & 0x40) &&
5198 			    (stcb != NULL) &&
5199 			    (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
5200 			    (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
5201 			    (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5202 				struct sctp_gen_error_cause *cause;
5203 				int len;
5204 
5205 				op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5206 				    0, M_NOWAIT, 1, MT_DATA);
5207 				if (op_err != NULL) {
5208 					len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5209 					cause = mtod(op_err, struct sctp_gen_error_cause *);
5210 					cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5211 					cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5212 					SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5213 					SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5214 					if (SCTP_BUF_NEXT(op_err) != NULL) {
5215 #ifdef SCTP_MBUF_LOGGING
5216 						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5217 							sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5218 						}
5219 #endif
5220 						sctp_queue_op_err(stcb, op_err);
5221 					} else {
5222 						sctp_m_freem(op_err);
5223 					}
5224 				}
5225 			}
5226 			if ((ch->chunk_type & 0x80) == 0) {
5227 				/* discard this packet */
5228 				*offset = length;
5229 				return (stcb);
5230 			}	/* else skip this bad chunk and continue... */
5231 			break;
5232 		}		/* switch (ch->chunk_type) */
5233 
5234 next_chunk:
5235 		/* get the next chunk */
5236 		*offset += SCTP_SIZE32(chk_length);
5237 		if (*offset >= length) {
5238 			/* no more data left in the mbuf chain */
5239 			break;
5240 		}
5241 		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5242 		    sizeof(struct sctp_chunkhdr), chunk_buf);
5243 		if (ch == NULL) {
5244 			*offset = length;
5245 			return (stcb);
5246 		}
5247 	}			/* while */
5248 
5249 	if ((asconf_cnt > 0) && (stcb != NULL)) {
5250 		sctp_send_asconf_ack(stcb);
5251 	}
5252 	return (stcb);
5253 }
5254 
5255 /*
5256  * common input chunk processing (v4 and v6)
5257  */
5258 void
5259 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5260     struct sockaddr *src, struct sockaddr *dst,
5261     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5262     uint8_t compute_crc,
5263     uint8_t ecn_bits,
5264     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5265     uint32_t vrf_id, uint16_t port)
5266 {
5267 	uint32_t high_tsn;
5268 	int fwd_tsn_seen = 0, data_processed = 0;
5269 	struct mbuf *m = *mm, *op_err;
5270 	char msg[SCTP_DIAG_INFO_LEN];
5271 	int un_sent;
5272 	int cnt_ctrl_ready = 0;
5273 	struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5274 	struct sctp_tcb *stcb = NULL;
5275 	struct sctp_nets *net = NULL;
5276 
5277 	SCTP_STAT_INCR(sctps_recvdatagrams);
5278 #ifdef SCTP_AUDITING_ENABLED
5279 	sctp_audit_log(0xE0, 1);
5280 	sctp_auditing(0, inp, stcb, net);
5281 #endif
5282 	if (compute_crc != 0) {
5283 		uint32_t check, calc_check;
5284 
5285 		check = sh->checksum;
5286 		sh->checksum = 0;
5287 		calc_check = sctp_calculate_cksum(m, iphlen);
5288 		sh->checksum = check;
5289 		if (calc_check != check) {
5290 			SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5291 			    calc_check, check, (void *)m, length, iphlen);
5292 			stcb = sctp_findassociation_addr(m, offset, src, dst,
5293 			    sh, ch, &inp, &net, vrf_id);
5294 #if defined(INET) || defined(INET6)
5295 			if ((ch->chunk_type != SCTP_INITIATION) &&
5296 			    (net != NULL) && (net->port != port)) {
5297 				if (net->port == 0) {
5298 					/* UDP encapsulation turned on. */
5299 					net->mtu -= sizeof(struct udphdr);
5300 					if (stcb->asoc.smallest_mtu > net->mtu) {
5301 						sctp_pathmtu_adjustment(stcb, net->mtu);
5302 					}
5303 				} else if (port == 0) {
5304 					/* UDP encapsulation turned off. */
5305 					net->mtu += sizeof(struct udphdr);
5306 					/* XXX Update smallest_mtu */
5307 				}
5308 				net->port = port;
5309 			}
5310 #endif
5311 			if (net != NULL) {
5312 				net->flowtype = mflowtype;
5313 				net->flowid = mflowid;
5314 			}
5315 			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5316 			if ((inp != NULL) && (stcb != NULL)) {
5317 				sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5318 				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5319 			} else if ((inp != NULL) && (stcb == NULL)) {
5320 				inp_decr = inp;
5321 			}
5322 			SCTP_STAT_INCR(sctps_badsum);
5323 			SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5324 			goto out;
5325 		}
5326 	}
5327 	/* Destination port of 0 is illegal, based on RFC4960. */
5328 	if (sh->dest_port == 0) {
5329 		SCTP_STAT_INCR(sctps_hdrops);
5330 		goto out;
5331 	}
5332 	stcb = sctp_findassociation_addr(m, offset, src, dst,
5333 	    sh, ch, &inp, &net, vrf_id);
5334 #if defined(INET) || defined(INET6)
5335 	if ((ch->chunk_type != SCTP_INITIATION) &&
5336 	    (net != NULL) && (net->port != port)) {
5337 		if (net->port == 0) {
5338 			/* UDP encapsulation turned on. */
5339 			net->mtu -= sizeof(struct udphdr);
5340 			if (stcb->asoc.smallest_mtu > net->mtu) {
5341 				sctp_pathmtu_adjustment(stcb, net->mtu);
5342 			}
5343 		} else if (port == 0) {
5344 			/* UDP encapsulation turned off. */
5345 			net->mtu += sizeof(struct udphdr);
5346 			/* XXX Update smallest_mtu */
5347 		}
5348 		net->port = port;
5349 	}
5350 #endif
5351 	if (net != NULL) {
5352 		net->flowtype = mflowtype;
5353 		net->flowid = mflowid;
5354 	}
5355 	if (inp == NULL) {
5356 		SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5357 		SCTP_STAT_INCR(sctps_noport);
5358 		if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5359 			goto out;
5360 		}
5361 		if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5362 			sctp_send_shutdown_complete2(src, dst, sh,
5363 			    mflowtype, mflowid, fibnum,
5364 			    vrf_id, port);
5365 			goto out;
5366 		}
5367 		if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5368 			goto out;
5369 		}
5370 		if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5371 			if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5372 			    ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5373 			    (ch->chunk_type != SCTP_INIT))) {
5374 				op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5375 				    "Out of the blue");
5376 				sctp_send_abort(m, iphlen, src, dst,
5377 				    sh, 0, op_err,
5378 				    mflowtype, mflowid, fibnum,
5379 				    vrf_id, port);
5380 			}
5381 		}
5382 		goto out;
5383 	} else if (stcb == NULL) {
5384 		inp_decr = inp;
5385 	}
5386 	SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5387 	    (void *)m, iphlen, offset, length, (void *)stcb);
5388 	if (stcb) {
5389 		/* always clear this before beginning a packet */
5390 		stcb->asoc.authenticated = 0;
5391 		stcb->asoc.seen_a_sack_this_pkt = 0;
5392 		SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5393 		    (void *)stcb, stcb->asoc.state);
5394 
5395 		if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5396 		    (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5397 			/*-
5398 			 * If we hit here, we had a ref count
5399 			 * up when the assoc was aborted and the
5400 			 * timer is clearing out the assoc, we should
5401 			 * NOT respond to any packet.. its OOTB.
5402 			 */
5403 			SCTP_TCB_UNLOCK(stcb);
5404 			stcb = NULL;
5405 			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5406 			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5407 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5408 			    msg);
5409 			sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5410 			    mflowtype, mflowid, inp->fibnum,
5411 			    vrf_id, port);
5412 			goto out;
5413 		}
5414 	}
5415 	if (IS_SCTP_CONTROL(ch)) {
5416 		/* process the control portion of the SCTP packet */
5417 		/* sa_ignore NO_NULL_CHK */
5418 		stcb = sctp_process_control(m, iphlen, &offset, length,
5419 		    src, dst, sh, ch,
5420 		    inp, stcb, &net, &fwd_tsn_seen,
5421 		    mflowtype, mflowid, fibnum,
5422 		    vrf_id, port);
5423 		if (stcb) {
5424 			/*
5425 			 * This covers us if the cookie-echo was there and
5426 			 * it changes our INP.
5427 			 */
5428 			inp = stcb->sctp_ep;
5429 #if defined(INET) || defined(INET6)
5430 			if ((ch->chunk_type != SCTP_INITIATION) &&
5431 			    (net != NULL) && (net->port != port)) {
5432 				if (net->port == 0) {
5433 					/* UDP encapsulation turned on. */
5434 					net->mtu -= sizeof(struct udphdr);
5435 					if (stcb->asoc.smallest_mtu > net->mtu) {
5436 						sctp_pathmtu_adjustment(stcb, net->mtu);
5437 					}
5438 				} else if (port == 0) {
5439 					/* UDP encapsulation turned off. */
5440 					net->mtu += sizeof(struct udphdr);
5441 					/* XXX Update smallest_mtu */
5442 				}
5443 				net->port = port;
5444 			}
5445 #endif
5446 		}
5447 	} else {
5448 		/*
5449 		 * no control chunks, so pre-process DATA chunks (these
5450 		 * checks are taken care of by control processing)
5451 		 */
5452 
5453 		/*
5454 		 * if DATA only packet, and auth is required, then punt...
5455 		 * can't have authenticated without any AUTH (control)
5456 		 * chunks
5457 		 */
5458 		if ((stcb != NULL) &&
5459 		    sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5460 			/* "silently" ignore */
5461 			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5462 			SCTP_STAT_INCR(sctps_recvauthmissing);
5463 			goto out;
5464 		}
5465 		if (stcb == NULL) {
5466 			/* out of the blue DATA chunk */
5467 			SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5468 			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5469 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5470 			    msg);
5471 			sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5472 			    mflowtype, mflowid, fibnum,
5473 			    vrf_id, port);
5474 			goto out;
5475 		}
5476 		if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5477 			/* v_tag mismatch! */
5478 			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5479 			SCTP_STAT_INCR(sctps_badvtag);
5480 			goto out;
5481 		}
5482 	}
5483 
5484 	SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5485 	if (stcb == NULL) {
5486 		/*
5487 		 * no valid TCB for this packet, or we found it's a bad
5488 		 * packet while processing control, or we're done with this
5489 		 * packet (done or skip rest of data), so we drop it...
5490 		 */
5491 		goto out;
5492 	}
5493 
5494 	/*
5495 	 * DATA chunk processing
5496 	 */
5497 	/* plow through the data chunks while length > offset */
5498 
5499 	/*
5500 	 * Rest should be DATA only.  Check authentication state if AUTH for
5501 	 * DATA is required.
5502 	 */
5503 	if ((length > offset) &&
5504 	    (stcb != NULL) &&
5505 	    sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5506 	    !stcb->asoc.authenticated) {
5507 		/* "silently" ignore */
5508 		SCTP_STAT_INCR(sctps_recvauthmissing);
5509 		SCTPDBG(SCTP_DEBUG_AUTH1,
5510 		    "Data chunk requires AUTH, skipped\n");
5511 		goto trigger_send;
5512 	}
5513 	if (length > offset) {
5514 		int retval;
5515 
5516 		/*
5517 		 * First check to make sure our state is correct. We would
5518 		 * not get here unless we really did have a tag, so we don't
5519 		 * abort if this happens, just dump the chunk silently.
5520 		 */
5521 		switch (SCTP_GET_STATE(stcb)) {
5522 		case SCTP_STATE_COOKIE_ECHOED:
5523 			/*
5524 			 * we consider data with valid tags in this state
5525 			 * shows us the cookie-ack was lost. Imply it was
5526 			 * there.
5527 			 */
5528 			sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5529 			break;
5530 		case SCTP_STATE_COOKIE_WAIT:
5531 			/*
5532 			 * We consider OOTB any data sent during asoc setup.
5533 			 */
5534 			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5535 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5536 			    msg);
5537 			sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5538 			    mflowtype, mflowid, inp->fibnum,
5539 			    vrf_id, port);
5540 			goto out;
5541 			/* sa_ignore NOTREACHED */
5542 			break;
5543 		case SCTP_STATE_EMPTY:	/* should not happen */
5544 		case SCTP_STATE_INUSE:	/* should not happen */
5545 		case SCTP_STATE_SHUTDOWN_RECEIVED:	/* This is a peer error */
5546 		case SCTP_STATE_SHUTDOWN_ACK_SENT:
5547 		default:
5548 			goto out;
5549 			/* sa_ignore NOTREACHED */
5550 			break;
5551 		case SCTP_STATE_OPEN:
5552 		case SCTP_STATE_SHUTDOWN_SENT:
5553 			break;
5554 		}
5555 		/* plow through the data chunks while length > offset */
5556 		retval = sctp_process_data(mm, iphlen, &offset, length,
5557 		    inp, stcb, net, &high_tsn);
5558 		if (retval == 2) {
5559 			/*
5560 			 * The association aborted, NO UNLOCK needed since
5561 			 * the association is destroyed.
5562 			 */
5563 			stcb = NULL;
5564 			goto out;
5565 		}
5566 		data_processed = 1;
5567 		/*
5568 		 * Anything important needs to have been m_copy'ed in
5569 		 * process_data
5570 		 */
5571 	}
5572 
5573 	/* take care of ecn */
5574 	if ((data_processed == 1) &&
5575 	    (stcb->asoc.ecn_supported == 1) &&
5576 	    ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5577 		/* Yep, we need to add a ECNE */
5578 		sctp_send_ecn_echo(stcb, net, high_tsn);
5579 	}
5580 
5581 	if ((data_processed == 0) && (fwd_tsn_seen)) {
5582 		int was_a_gap;
5583 		uint32_t highest_tsn;
5584 
5585 		if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5586 			highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5587 		} else {
5588 			highest_tsn = stcb->asoc.highest_tsn_inside_map;
5589 		}
5590 		was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5591 		stcb->asoc.send_sack = 1;
5592 		sctp_sack_check(stcb, was_a_gap);
5593 	} else if (fwd_tsn_seen) {
5594 		stcb->asoc.send_sack = 1;
5595 	}
5596 	/* trigger send of any chunks in queue... */
5597 trigger_send:
5598 #ifdef SCTP_AUDITING_ENABLED
5599 	sctp_audit_log(0xE0, 2);
5600 	sctp_auditing(1, inp, stcb, net);
5601 #endif
5602 	SCTPDBG(SCTP_DEBUG_INPUT1,
5603 	    "Check for chunk output prw:%d tqe:%d tf=%d\n",
5604 	    stcb->asoc.peers_rwnd,
5605 	    TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5606 	    stcb->asoc.total_flight);
5607 	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5608 	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5609 		cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5610 	}
5611 	if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5612 	    cnt_ctrl_ready ||
5613 	    stcb->asoc.trigger_reset ||
5614 	    ((un_sent > 0) &&
5615 	    (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
5616 		SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5617 		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5618 		SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5619 	}
5620 #ifdef SCTP_AUDITING_ENABLED
5621 	sctp_audit_log(0xE0, 3);
5622 	sctp_auditing(2, inp, stcb, net);
5623 #endif
5624 out:
5625 	if (stcb != NULL) {
5626 		SCTP_TCB_UNLOCK(stcb);
5627 	}
5628 	if (inp_decr != NULL) {
5629 		/* reduce ref-count */
5630 		SCTP_INP_WLOCK(inp_decr);
5631 		SCTP_INP_DECR_REF(inp_decr);
5632 		SCTP_INP_WUNLOCK(inp_decr);
5633 	}
5634 	return;
5635 }
5636 
5637 #ifdef INET
5638 void
5639 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5640 {
5641 	struct mbuf *m;
5642 	int iphlen;
5643 	uint32_t vrf_id = 0;
5644 	uint8_t ecn_bits;
5645 	struct sockaddr_in src, dst;
5646 	struct ip *ip;
5647 	struct sctphdr *sh;
5648 	struct sctp_chunkhdr *ch;
5649 	int length, offset;
5650 	uint8_t compute_crc;
5651 	uint32_t mflowid;
5652 	uint8_t mflowtype;
5653 	uint16_t fibnum;
5654 
5655 	iphlen = off;
5656 	if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5657 		SCTP_RELEASE_PKT(i_pak);
5658 		return;
5659 	}
5660 	m = SCTP_HEADER_TO_CHAIN(i_pak);
5661 #ifdef SCTP_MBUF_LOGGING
5662 	/* Log in any input mbufs */
5663 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5664 		sctp_log_mbc(m, SCTP_MBUF_INPUT);
5665 	}
5666 #endif
5667 #ifdef SCTP_PACKET_LOGGING
5668 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5669 		sctp_packet_log(m);
5670 	}
5671 #endif
5672 	SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5673 	    "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5674 	    m->m_pkthdr.len,
5675 	    if_name(m->m_pkthdr.rcvif),
5676 	    (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5677 	mflowid = m->m_pkthdr.flowid;
5678 	mflowtype = M_HASHTYPE_GET(m);
5679 	fibnum = M_GETFIB(m);
5680 	SCTP_STAT_INCR(sctps_recvpackets);
5681 	SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5682 	/* Get IP, SCTP, and first chunk header together in the first mbuf. */
5683 	offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5684 	if (SCTP_BUF_LEN(m) < offset) {
5685 		if ((m = m_pullup(m, offset)) == NULL) {
5686 			SCTP_STAT_INCR(sctps_hdrops);
5687 			return;
5688 		}
5689 	}
5690 	ip = mtod(m, struct ip *);
5691 	sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5692 	ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5693 	offset -= sizeof(struct sctp_chunkhdr);
5694 	memset(&src, 0, sizeof(struct sockaddr_in));
5695 	src.sin_family = AF_INET;
5696 	src.sin_len = sizeof(struct sockaddr_in);
5697 	src.sin_port = sh->src_port;
5698 	src.sin_addr = ip->ip_src;
5699 	memset(&dst, 0, sizeof(struct sockaddr_in));
5700 	dst.sin_family = AF_INET;
5701 	dst.sin_len = sizeof(struct sockaddr_in);
5702 	dst.sin_port = sh->dest_port;
5703 	dst.sin_addr = ip->ip_dst;
5704 	length = ntohs(ip->ip_len);
5705 	/* Validate mbuf chain length with IP payload length. */
5706 	if (SCTP_HEADER_LEN(m) != length) {
5707 		SCTPDBG(SCTP_DEBUG_INPUT1,
5708 		    "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5709 		SCTP_STAT_INCR(sctps_hdrops);
5710 		goto out;
5711 	}
5712 	/* SCTP does not allow broadcasts or multicasts */
5713 	if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5714 		goto out;
5715 	}
5716 	if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5717 		goto out;
5718 	}
5719 	ecn_bits = ip->ip_tos;
5720 	if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5721 		SCTP_STAT_INCR(sctps_recvhwcrc);
5722 		compute_crc = 0;
5723 	} else {
5724 		SCTP_STAT_INCR(sctps_recvswcrc);
5725 		compute_crc = 1;
5726 	}
5727 	sctp_common_input_processing(&m, iphlen, offset, length,
5728 	    (struct sockaddr *)&src,
5729 	    (struct sockaddr *)&dst,
5730 	    sh, ch,
5731 	    compute_crc,
5732 	    ecn_bits,
5733 	    mflowtype, mflowid, fibnum,
5734 	    vrf_id, port);
5735 out:
5736 	if (m) {
5737 		sctp_m_freem(m);
5738 	}
5739 	return;
5740 }
5741 
5742 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5743 extern int *sctp_cpuarry;
5744 #endif
5745 
5746 int
5747 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
5748 {
5749 	struct mbuf *m;
5750 	int off;
5751 
5752 	m = *mp;
5753 	off = *offp;
5754 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5755 	if (mp_ncpus > 1) {
5756 		struct ip *ip;
5757 		struct sctphdr *sh;
5758 		int offset;
5759 		int cpu_to_use;
5760 		uint32_t flowid, tag;
5761 
5762 		if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
5763 			flowid = m->m_pkthdr.flowid;
5764 		} else {
5765 			/*
5766 			 * No flow id built by lower layers fix it so we
5767 			 * create one.
5768 			 */
5769 			offset = off + sizeof(struct sctphdr);
5770 			if (SCTP_BUF_LEN(m) < offset) {
5771 				if ((m = m_pullup(m, offset)) == NULL) {
5772 					SCTP_STAT_INCR(sctps_hdrops);
5773 					return (IPPROTO_DONE);
5774 				}
5775 			}
5776 			ip = mtod(m, struct ip *);
5777 			sh = (struct sctphdr *)((caddr_t)ip + off);
5778 			tag = htonl(sh->v_tag);
5779 			flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5780 			m->m_pkthdr.flowid = flowid;
5781 			M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
5782 		}
5783 		cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5784 		sctp_queue_to_mcore(m, off, cpu_to_use);
5785 		return (IPPROTO_DONE);
5786 	}
5787 #endif
5788 	sctp_input_with_port(m, off, 0);
5789 	return (IPPROTO_DONE);
5790 }
5791 #endif
5792