xref: /freebsd/sys/netinet/sctp_input.c (revision 19261079b74319502c6ffa1249920079f0f69a72)
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,
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 parameters */
102 	init = &cp->init;
103 	if (ntohl(init->initiate_tag) == 0) {
104 		goto outnow;
105 	}
106 	if ((ntohl(init->a_rwnd) < SCTP_MIN_RWND) ||
107 	    (ntohs(init->num_inbound_streams) == 0) ||
108 	    (ntohs(init->num_outbound_streams) == 0)) {
109 		/* protocol error... send abort */
110 		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
111 		sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err,
112 		    mflowtype, mflowid, inp->fibnum,
113 		    vrf_id, port);
114 		goto outnow;
115 	}
116 	if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
117 	    offset + ntohs(cp->ch.chunk_length))) {
118 		/* auth parameter(s) error... send abort */
119 		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
120 		    "Problem with AUTH parameters");
121 		sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err,
122 		    mflowtype, mflowid, inp->fibnum,
123 		    vrf_id, port);
124 		goto outnow;
125 	}
126 	/* We are only accepting if we have a listening socket. */
127 	if ((stcb == NULL) &&
128 	    ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
129 	    (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
130 	    (!SCTP_IS_LISTENING(inp)))) {
131 		/*
132 		 * FIX ME ?? What about TCP model and we have a
133 		 * match/restart case? Actually no fix is needed. the lookup
134 		 * will always find the existing assoc so stcb would not be
135 		 * NULL. It may be questionable to do this since we COULD
136 		 * just send back the INIT-ACK and hope that the app did
137 		 * accept()'s by the time the COOKIE was sent. But there is
138 		 * a price to pay for COOKIE generation and I don't want to
139 		 * pay it on the chance that the app will actually do some
140 		 * accepts(). The App just looses and should NOT be in this
141 		 * state :-)
142 		 */
143 		if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
144 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
145 			    "No listener");
146 			sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
147 			    mflowtype, mflowid, inp->fibnum,
148 			    vrf_id, port);
149 		}
150 		goto outnow;
151 	}
152 	if ((stcb != NULL) &&
153 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
154 		SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
155 		sctp_send_shutdown_ack(stcb, NULL);
156 		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
157 	} else {
158 		SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
159 		sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
160 		    src, dst, sh, cp,
161 		    mflowtype, mflowid,
162 		    vrf_id, port);
163 	}
164 outnow:
165 	if (stcb == NULL) {
166 		SCTP_INP_RUNLOCK(inp);
167 	}
168 }
169 
170 /*
171  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
172  */
173 
174 int
175 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked)
176 {
177 	int unsent_data;
178 	unsigned int i;
179 	struct sctp_stream_queue_pending *sp;
180 	struct sctp_association *asoc;
181 
182 	/*
183 	 * This function returns if any stream has true unsent data on it.
184 	 * Note that as it looks through it will clean up any places that
185 	 * have old data that has been sent but left at top of stream queue.
186 	 */
187 	asoc = &stcb->asoc;
188 	unsent_data = 0;
189 	SCTP_TCB_SEND_LOCK(stcb);
190 	if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
191 		/* Check to see if some data queued */
192 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
193 			/* sa_ignore FREED_MEMORY */
194 			sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
195 			if (sp == NULL) {
196 				continue;
197 			}
198 			if ((sp->msg_is_complete) &&
199 			    (sp->length == 0) &&
200 			    (sp->sender_all_done)) {
201 				/*
202 				 * We are doing differed cleanup. Last time
203 				 * through when we took all the data the
204 				 * sender_all_done was not set.
205 				 */
206 				if (sp->put_last_out == 0) {
207 					SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
208 					SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
209 					    sp->sender_all_done,
210 					    sp->length,
211 					    sp->msg_is_complete,
212 					    sp->put_last_out);
213 				}
214 				atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
215 				TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
216 				stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
217 				if (sp->net) {
218 					sctp_free_remote_addr(sp->net);
219 					sp->net = NULL;
220 				}
221 				if (sp->data) {
222 					sctp_m_freem(sp->data);
223 					sp->data = NULL;
224 				}
225 				sctp_free_a_strmoq(stcb, sp, so_locked);
226 				if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
227 					unsent_data++;
228 				}
229 			} else {
230 				unsent_data++;
231 			}
232 			if (unsent_data > 0) {
233 				break;
234 			}
235 		}
236 	}
237 	SCTP_TCB_SEND_UNLOCK(stcb);
238 	return (unsent_data);
239 }
240 
241 static int
242 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
243 {
244 	struct sctp_init *init;
245 	struct sctp_association *asoc;
246 	struct sctp_nets *lnet;
247 	unsigned int i;
248 
249 	init = &cp->init;
250 	asoc = &stcb->asoc;
251 	/* save off parameters */
252 	asoc->peer_vtag = ntohl(init->initiate_tag);
253 	asoc->peers_rwnd = ntohl(init->a_rwnd);
254 	/* init tsn's */
255 	asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
256 
257 	if (!TAILQ_EMPTY(&asoc->nets)) {
258 		/* update any ssthresh's that may have a default */
259 		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
260 			lnet->ssthresh = asoc->peers_rwnd;
261 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
262 				sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
263 			}
264 		}
265 	}
266 	SCTP_TCB_SEND_LOCK(stcb);
267 	if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
268 		unsigned int newcnt;
269 		struct sctp_stream_out *outs;
270 		struct sctp_stream_queue_pending *sp, *nsp;
271 		struct sctp_tmit_chunk *chk, *nchk;
272 
273 		/* abandon the upper streams */
274 		newcnt = ntohs(init->num_inbound_streams);
275 		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
276 			if (chk->rec.data.sid >= newcnt) {
277 				TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
278 				asoc->send_queue_cnt--;
279 				if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
280 					asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
281 #ifdef INVARIANTS
282 				} else {
283 					panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
284 #endif
285 				}
286 				if (chk->data != NULL) {
287 					sctp_free_bufspace(stcb, asoc, chk, 1);
288 					sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
289 					    0, chk, SCTP_SO_NOT_LOCKED);
290 					if (chk->data) {
291 						sctp_m_freem(chk->data);
292 						chk->data = NULL;
293 					}
294 				}
295 				sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
296 				/* sa_ignore FREED_MEMORY */
297 			}
298 		}
299 		if (asoc->strmout) {
300 			for (i = newcnt; i < asoc->pre_open_streams; i++) {
301 				outs = &asoc->strmout[i];
302 				TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
303 					atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
304 					TAILQ_REMOVE(&outs->outqueue, sp, next);
305 					stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
306 					sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
307 					    stcb, 0, sp, SCTP_SO_NOT_LOCKED);
308 					if (sp->data) {
309 						sctp_m_freem(sp->data);
310 						sp->data = NULL;
311 					}
312 					if (sp->net) {
313 						sctp_free_remote_addr(sp->net);
314 						sp->net = NULL;
315 					}
316 					/* Free the chunk */
317 					sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
318 					/* sa_ignore FREED_MEMORY */
319 				}
320 				outs->state = SCTP_STREAM_CLOSED;
321 			}
322 		}
323 		/* cut back the count */
324 		asoc->pre_open_streams = newcnt;
325 	}
326 	SCTP_TCB_SEND_UNLOCK(stcb);
327 	asoc->streamoutcnt = asoc->pre_open_streams;
328 	if (asoc->strmout) {
329 		for (i = 0; i < asoc->streamoutcnt; i++) {
330 			asoc->strmout[i].state = SCTP_STREAM_OPEN;
331 		}
332 	}
333 	/* EY - nr_sack: initialize highest tsn in nr_mapping_array */
334 	asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
335 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
336 		sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
337 	}
338 	/* This is the next one we expect */
339 	asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
340 
341 	asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
342 	asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
343 
344 	asoc->advanced_peer_ack_point = asoc->last_acked_seq;
345 	/* open the requested streams */
346 
347 	if (asoc->strmin != NULL) {
348 		/* Free the old ones */
349 		for (i = 0; i < asoc->streamincnt; i++) {
350 			sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
351 			sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
352 		}
353 		SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
354 	}
355 	if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
356 		asoc->streamincnt = ntohs(init->num_outbound_streams);
357 	} else {
358 		asoc->streamincnt = asoc->max_inbound_streams;
359 	}
360 	SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
361 	    sizeof(struct sctp_stream_in), SCTP_M_STRMI);
362 	if (asoc->strmin == NULL) {
363 		/* we didn't get memory for the streams! */
364 		SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
365 		return (-1);
366 	}
367 	for (i = 0; i < asoc->streamincnt; i++) {
368 		asoc->strmin[i].sid = i;
369 		asoc->strmin[i].last_mid_delivered = 0xffffffff;
370 		TAILQ_INIT(&asoc->strmin[i].inqueue);
371 		TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
372 		asoc->strmin[i].pd_api_started = 0;
373 		asoc->strmin[i].delivery_started = 0;
374 	}
375 	/*
376 	 * load_address_from_init will put the addresses into the
377 	 * association when the COOKIE is processed or the INIT-ACK is
378 	 * processed. Both types of COOKIE's existing and new call this
379 	 * routine. It will remove addresses that are no longer in the
380 	 * association (for the restarting case where addresses are
381 	 * removed). Up front when the INIT arrives we will discard it if it
382 	 * is a restart and new addresses have been added.
383 	 */
384 	/* sa_ignore MEMLEAK */
385 	return (0);
386 }
387 
388 /*
389  * INIT-ACK message processing/consumption returns value < 0 on error
390  */
391 static int
392 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
393     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
394     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
395     struct sctp_nets *net, int *abort_no_unlock,
396     uint8_t mflowtype, uint32_t mflowid,
397     uint32_t vrf_id)
398 {
399 	struct sctp_association *asoc;
400 	struct mbuf *op_err;
401 	int retval, abort_flag, cookie_found;
402 	int initack_limit;
403 	int nat_friendly = 0;
404 
405 	/* First verify that we have no illegal param's */
406 	abort_flag = 0;
407 	cookie_found = 0;
408 
409 	op_err = sctp_arethere_unrecognized_parameters(m,
410 	    (offset + sizeof(struct sctp_init_chunk)),
411 	    &abort_flag, (struct sctp_chunkhdr *)cp,
412 	    &nat_friendly, &cookie_found);
413 	if (abort_flag) {
414 		/* Send an abort and notify peer */
415 		sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
416 		*abort_no_unlock = 1;
417 		return (-1);
418 	}
419 	if (!cookie_found) {
420 		uint16_t len;
421 
422 		/* Only report the missing cookie parameter */
423 		if (op_err != NULL) {
424 			sctp_m_freem(op_err);
425 		}
426 		len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
427 		/* We abort with an error of missing mandatory param */
428 		op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
429 		if (op_err != NULL) {
430 			struct sctp_error_missing_param *cause;
431 
432 			SCTP_BUF_LEN(op_err) = len;
433 			cause = mtod(op_err, struct sctp_error_missing_param *);
434 			/* Subtract the reserved param */
435 			cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
436 			cause->cause.length = htons(len);
437 			cause->num_missing_params = htonl(1);
438 			cause->type[0] = htons(SCTP_STATE_COOKIE);
439 		}
440 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
441 		    src, dst, sh, op_err,
442 		    mflowtype, mflowid,
443 		    vrf_id, net->port);
444 		*abort_no_unlock = 1;
445 		return (-3);
446 	}
447 	asoc = &stcb->asoc;
448 	asoc->peer_supports_nat = (uint8_t)nat_friendly;
449 	/* process the peer's parameters in the INIT-ACK */
450 	if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) {
451 		if (op_err != NULL) {
452 			sctp_m_freem(op_err);
453 		}
454 		op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
455 		SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
456 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
457 		    src, dst, sh, op_err,
458 		    mflowtype, mflowid,
459 		    vrf_id, net->port);
460 		*abort_no_unlock = 1;
461 		return (-1);
462 	}
463 	initack_limit = offset + ntohs(cp->ch.chunk_length);
464 	/* load all addresses */
465 	if ((retval = sctp_load_addresses_from_init(stcb, m,
466 	    offset + sizeof(struct sctp_init_chunk),
467 	    initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) {
468 		if (op_err != NULL) {
469 			sctp_m_freem(op_err);
470 		}
471 		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
472 		    "Problem with address parameters");
473 		SCTPDBG(SCTP_DEBUG_INPUT1,
474 		    "Load addresses from INIT causes an abort %d\n",
475 		    retval);
476 		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
477 		    src, dst, sh, op_err,
478 		    mflowtype, mflowid,
479 		    vrf_id, net->port);
480 		*abort_no_unlock = 1;
481 		return (-1);
482 	}
483 	/* if the peer doesn't support asconf, flush the asconf queue */
484 	if (asoc->asconf_supported == 0) {
485 		struct sctp_asconf_addr *param, *nparam;
486 
487 		TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
488 			TAILQ_REMOVE(&asoc->asconf_queue, param, next);
489 			SCTP_FREE(param, SCTP_M_ASC_ADDR);
490 		}
491 	}
492 
493 	stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
494 	    stcb->asoc.local_hmacs);
495 	if (op_err) {
496 		sctp_queue_op_err(stcb, op_err);
497 		/* queuing will steal away the mbuf chain to the out queue */
498 		op_err = NULL;
499 	}
500 	/* extract the cookie and queue it to "echo" it back... */
501 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
502 		sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
503 		    stcb->asoc.overall_error_count,
504 		    0,
505 		    SCTP_FROM_SCTP_INPUT,
506 		    __LINE__);
507 	}
508 	stcb->asoc.overall_error_count = 0;
509 	net->error_count = 0;
510 
511 	/*
512 	 * Cancel the INIT timer, We do this first before queueing the
513 	 * cookie. We always cancel at the primary to assue that we are
514 	 * canceling the timer started by the INIT which always goes to the
515 	 * primary.
516 	 */
517 	sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
518 	    asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
519 
520 	/* calculate the RTO */
521 	sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
522 	    SCTP_RTT_FROM_NON_DATA);
523 	retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
524 	return (retval);
525 }
526 
527 static void
528 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
529     struct sctp_tcb *stcb, struct sctp_nets *net)
530 {
531 	union sctp_sockstore store;
532 	struct sctp_nets *r_net, *f_net;
533 	struct timeval tv;
534 	int req_prim = 0;
535 	uint16_t old_error_counter;
536 
537 	if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
538 		/* Invalid length */
539 		return;
540 	}
541 
542 	memset(&store, 0, sizeof(store));
543 	switch (cp->heartbeat.hb_info.addr_family) {
544 #ifdef INET
545 	case AF_INET:
546 		if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
547 			store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
548 			store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
549 			store.sin.sin_port = stcb->rport;
550 			memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
551 			    sizeof(store.sin.sin_addr));
552 		} else {
553 			return;
554 		}
555 		break;
556 #endif
557 #ifdef INET6
558 	case AF_INET6:
559 		if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
560 			store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
561 			store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
562 			store.sin6.sin6_port = stcb->rport;
563 			memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
564 		} else {
565 			return;
566 		}
567 		break;
568 #endif
569 	default:
570 		return;
571 	}
572 	r_net = sctp_findnet(stcb, &store.sa);
573 	if (r_net == NULL) {
574 		SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
575 		return;
576 	}
577 	if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
578 	    (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
579 	    (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
580 		/*
581 		 * If the its a HB and it's random value is correct when can
582 		 * confirm the destination.
583 		 */
584 		r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
585 		if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
586 			stcb->asoc.primary_destination = r_net;
587 			r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
588 			f_net = TAILQ_FIRST(&stcb->asoc.nets);
589 			if (f_net != r_net) {
590 				/*
591 				 * first one on the list is NOT the primary
592 				 * sctp_cmpaddr() is much more efficient if
593 				 * the primary is the first on the list,
594 				 * make it so.
595 				 */
596 				TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
597 				TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
598 			}
599 			req_prim = 1;
600 		}
601 		sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
602 		    stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
603 		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
604 		    r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
605 		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
606 	}
607 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
608 		sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
609 		    stcb->asoc.overall_error_count,
610 		    0,
611 		    SCTP_FROM_SCTP_INPUT,
612 		    __LINE__);
613 	}
614 	stcb->asoc.overall_error_count = 0;
615 	old_error_counter = r_net->error_count;
616 	r_net->error_count = 0;
617 	r_net->hb_responded = 1;
618 	tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
619 	tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
620 	/* Now lets do a RTO with this */
621 	sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
622 	    SCTP_RTT_FROM_NON_DATA);
623 	if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
624 		r_net->dest_state |= SCTP_ADDR_REACHABLE;
625 		sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
626 		    0, (void *)r_net, SCTP_SO_NOT_LOCKED);
627 	}
628 	if (r_net->dest_state & SCTP_ADDR_PF) {
629 		r_net->dest_state &= ~SCTP_ADDR_PF;
630 		stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
631 	}
632 	if (old_error_counter > 0) {
633 		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
634 		    stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
635 		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
636 	}
637 	if (r_net == stcb->asoc.primary_destination) {
638 		if (stcb->asoc.alternate) {
639 			/* release the alternate, primary is good */
640 			sctp_free_remote_addr(stcb->asoc.alternate);
641 			stcb->asoc.alternate = NULL;
642 		}
643 	}
644 	/* Mobility adaptation */
645 	if (req_prim) {
646 		if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
647 		    SCTP_MOBILITY_BASE) ||
648 		    sctp_is_mobility_feature_on(stcb->sctp_ep,
649 		    SCTP_MOBILITY_FASTHANDOFF)) &&
650 		    sctp_is_mobility_feature_on(stcb->sctp_ep,
651 		    SCTP_MOBILITY_PRIM_DELETED)) {
652 			sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
653 			    stcb->sctp_ep, stcb, NULL,
654 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
655 			if (sctp_is_mobility_feature_on(stcb->sctp_ep,
656 			    SCTP_MOBILITY_FASTHANDOFF)) {
657 				sctp_assoc_immediate_retrans(stcb,
658 				    stcb->asoc.primary_destination);
659 			}
660 			if (sctp_is_mobility_feature_on(stcb->sctp_ep,
661 			    SCTP_MOBILITY_BASE)) {
662 				sctp_move_chunks_from_net(stcb,
663 				    stcb->asoc.deleted_primary);
664 			}
665 			sctp_delete_prim_timer(stcb->sctp_ep, stcb);
666 		}
667 	}
668 }
669 
670 static int
671 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
672 {
673 	/*
674 	 * Return 0 means we want you to proceed with the abort non-zero
675 	 * means no abort processing.
676 	 */
677 	uint32_t new_vtag;
678 	struct sctpasochead *head;
679 
680 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
681 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
682 		new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
683 		atomic_add_int(&stcb->asoc.refcnt, 1);
684 		SCTP_TCB_UNLOCK(stcb);
685 		SCTP_INP_INFO_WLOCK();
686 		SCTP_TCB_LOCK(stcb);
687 		atomic_subtract_int(&stcb->asoc.refcnt, 1);
688 	} else {
689 		return (0);
690 	}
691 	if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
692 		/* generate a new vtag and send init */
693 		LIST_REMOVE(stcb, sctp_asocs);
694 		stcb->asoc.my_vtag = new_vtag;
695 		head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
696 		/*
697 		 * put it in the bucket in the vtag hash of assoc's for the
698 		 * system
699 		 */
700 		LIST_INSERT_HEAD(head, stcb, sctp_asocs);
701 		SCTP_INP_INFO_WUNLOCK();
702 		sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
703 		return (1);
704 	} else {
705 		/*
706 		 * treat like a case where the cookie expired i.e.: - dump
707 		 * current cookie. - generate a new vtag. - resend init.
708 		 */
709 		/* generate a new vtag and send init */
710 		LIST_REMOVE(stcb, sctp_asocs);
711 		SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
712 		sctp_stop_all_cookie_timers(stcb);
713 		sctp_toss_old_cookies(stcb, &stcb->asoc);
714 		stcb->asoc.my_vtag = new_vtag;
715 		head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
716 		/*
717 		 * put it in the bucket in the vtag hash of assoc's for the
718 		 * system
719 		 */
720 		LIST_INSERT_HEAD(head, stcb, sctp_asocs);
721 		SCTP_INP_INFO_WUNLOCK();
722 		sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
723 		return (1);
724 	}
725 	return (0);
726 }
727 
728 static int
729 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
730     struct sctp_nets *net)
731 {
732 	/*
733 	 * return 0 means we want you to proceed with the abort non-zero
734 	 * means no abort processing
735 	 */
736 	if (stcb->asoc.auth_supported == 0) {
737 		SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
738 		return (0);
739 	}
740 	sctp_asconf_send_nat_state_update(stcb, net);
741 	return (1);
742 }
743 
744 /* Returns 1 if the stcb was aborted, 0 otherwise */
745 static int
746 sctp_handle_abort(struct sctp_abort_chunk *abort,
747     struct sctp_tcb *stcb, struct sctp_nets *net)
748 {
749 	uint16_t len;
750 	uint16_t error;
751 
752 	SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
753 	if (stcb == NULL)
754 		return (0);
755 
756 	len = ntohs(abort->ch.chunk_length);
757 	if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
758 		/*
759 		 * Need to check the cause codes for our two magic nat
760 		 * aborts which don't kill the assoc necessarily.
761 		 */
762 		struct sctp_error_cause *cause;
763 
764 		cause = (struct sctp_error_cause *)(abort + 1);
765 		error = ntohs(cause->code);
766 		if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
767 			SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n",
768 			    abort->ch.chunk_flags);
769 			if (sctp_handle_nat_colliding_state(stcb)) {
770 				return (0);
771 			}
772 		} else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
773 			SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n",
774 			    abort->ch.chunk_flags);
775 			if (sctp_handle_nat_missing_state(stcb, net)) {
776 				return (0);
777 			}
778 		}
779 	} else {
780 		error = 0;
781 	}
782 	/* stop any receive timers */
783 	sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
784 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
785 	/* notify user of the abort and clean up... */
786 	sctp_abort_notification(stcb, true, false, error, abort, SCTP_SO_NOT_LOCKED);
787 	/* free the tcb */
788 	SCTP_STAT_INCR_COUNTER32(sctps_aborted);
789 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
790 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
791 		SCTP_STAT_DECR_GAUGE32(sctps_currestab);
792 	}
793 #ifdef SCTP_ASOCLOG_OF_TSNS
794 	sctp_print_out_track_log(stcb);
795 #endif
796 	(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
797 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
798 	SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
799 	return (1);
800 }
801 
802 static void
803 sctp_start_net_timers(struct sctp_tcb *stcb)
804 {
805 	uint32_t cnt_hb_sent;
806 	struct sctp_nets *net;
807 
808 	cnt_hb_sent = 0;
809 	TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
810 		/*
811 		 * For each network start: 1) A pmtu timer. 2) A HB timer 3)
812 		 * If the dest in unconfirmed send a hb as well if under
813 		 * max_hb_burst have been sent.
814 		 */
815 		sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
816 		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
817 		if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
818 		    (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
819 			sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
820 			cnt_hb_sent++;
821 		}
822 	}
823 	if (cnt_hb_sent) {
824 		sctp_chunk_output(stcb->sctp_ep, stcb,
825 		    SCTP_OUTPUT_FROM_COOKIE_ACK,
826 		    SCTP_SO_NOT_LOCKED);
827 	}
828 }
829 
830 static void
831 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
832     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
833 {
834 	struct sctp_association *asoc;
835 	int some_on_streamwheel;
836 	int old_state;
837 
838 	SCTPDBG(SCTP_DEBUG_INPUT2,
839 	    "sctp_handle_shutdown: handling SHUTDOWN\n");
840 	if (stcb == NULL)
841 		return;
842 	asoc = &stcb->asoc;
843 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
844 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
845 		return;
846 	}
847 	if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
848 		/* Shutdown NOT the expected size */
849 		return;
850 	}
851 	old_state = SCTP_GET_STATE(stcb);
852 	sctp_update_acked(stcb, cp, abort_flag);
853 	if (*abort_flag) {
854 		return;
855 	}
856 	if (asoc->control_pdapi) {
857 		/*
858 		 * With a normal shutdown we assume the end of last record.
859 		 */
860 		SCTP_INP_READ_LOCK(stcb->sctp_ep);
861 		if (asoc->control_pdapi->on_strm_q) {
862 			struct sctp_stream_in *strm;
863 
864 			strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
865 			if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
866 				/* Unordered */
867 				TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
868 				asoc->control_pdapi->on_strm_q = 0;
869 			} else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
870 				/* Ordered */
871 				TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
872 				asoc->control_pdapi->on_strm_q = 0;
873 #ifdef INVARIANTS
874 			} else {
875 				panic("Unknown state on ctrl:%p on_strm_q:%d",
876 				    asoc->control_pdapi,
877 				    asoc->control_pdapi->on_strm_q);
878 #endif
879 			}
880 		}
881 		asoc->control_pdapi->end_added = 1;
882 		asoc->control_pdapi->pdapi_aborted = 1;
883 		asoc->control_pdapi = NULL;
884 		SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
885 		if (stcb->sctp_socket) {
886 			sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
887 		}
888 	}
889 	/* goto SHUTDOWN_RECEIVED state to block new requests */
890 	if (stcb->sctp_socket) {
891 		if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
892 		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
893 		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
894 			SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
895 			/*
896 			 * notify upper layer that peer has initiated a
897 			 * shutdown
898 			 */
899 			sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
900 
901 			/* reset time */
902 			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
903 		}
904 	}
905 	if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
906 		/*
907 		 * stop the shutdown timer, since we WILL move to
908 		 * SHUTDOWN-ACK-SENT.
909 		 */
910 		sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
911 		    net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
912 	}
913 	/* Now is there unsent data on a stream somewhere? */
914 	some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
915 
916 	if (!TAILQ_EMPTY(&asoc->send_queue) ||
917 	    !TAILQ_EMPTY(&asoc->sent_queue) ||
918 	    some_on_streamwheel) {
919 		/* By returning we will push more data out */
920 		return;
921 	} else {
922 		/* no outstanding data to send, so move on... */
923 		/* send SHUTDOWN-ACK */
924 		/* move to SHUTDOWN-ACK-SENT state */
925 		if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
926 		    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
927 			SCTP_STAT_DECR_GAUGE32(sctps_currestab);
928 		}
929 		if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
930 			SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
931 			sctp_stop_timers_for_shutdown(stcb);
932 			sctp_send_shutdown_ack(stcb, net);
933 			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
934 			    stcb->sctp_ep, stcb, net);
935 		} else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
936 			sctp_send_shutdown_ack(stcb, net);
937 		}
938 	}
939 }
940 
941 static void
942 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
943     struct sctp_tcb *stcb,
944     struct sctp_nets *net)
945 {
946 	struct sctp_association *asoc;
947 
948 	SCTPDBG(SCTP_DEBUG_INPUT2,
949 	    "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
950 	if (stcb == NULL)
951 		return;
952 
953 	asoc = &stcb->asoc;
954 	/* process according to association state */
955 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
956 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
957 		/* unexpected SHUTDOWN-ACK... do OOTB handling... */
958 		sctp_send_shutdown_complete(stcb, net, 1);
959 		SCTP_TCB_UNLOCK(stcb);
960 		return;
961 	}
962 	if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
963 	    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
964 		/* unexpected SHUTDOWN-ACK... so ignore... */
965 		SCTP_TCB_UNLOCK(stcb);
966 		return;
967 	}
968 	if (asoc->control_pdapi) {
969 		/*
970 		 * With a normal shutdown we assume the end of last record.
971 		 */
972 		SCTP_INP_READ_LOCK(stcb->sctp_ep);
973 		asoc->control_pdapi->end_added = 1;
974 		asoc->control_pdapi->pdapi_aborted = 1;
975 		asoc->control_pdapi = NULL;
976 		SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
977 		sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
978 	}
979 #ifdef INVARIANTS
980 	if (!TAILQ_EMPTY(&asoc->send_queue) ||
981 	    !TAILQ_EMPTY(&asoc->sent_queue) ||
982 	    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
983 		panic("Queues are not empty when handling SHUTDOWN-ACK");
984 	}
985 #endif
986 	/* stop the timer */
987 	sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
988 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
989 	/* send SHUTDOWN-COMPLETE */
990 	sctp_send_shutdown_complete(stcb, net, 0);
991 	/* notify upper layer protocol */
992 	if (stcb->sctp_socket) {
993 		if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
994 		    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
995 			stcb->sctp_socket->so_snd.sb_cc = 0;
996 		}
997 		sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
998 	}
999 	SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1000 	/* free the TCB but first save off the ep */
1001 	(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1002 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1003 }
1004 
1005 static void
1006 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
1007 {
1008 	switch (chunk_type) {
1009 	case SCTP_ASCONF_ACK:
1010 	case SCTP_ASCONF:
1011 		sctp_asconf_cleanup(stcb);
1012 		break;
1013 	case SCTP_IFORWARD_CUM_TSN:
1014 	case SCTP_FORWARD_CUM_TSN:
1015 		stcb->asoc.prsctp_supported = 0;
1016 		break;
1017 	default:
1018 		SCTPDBG(SCTP_DEBUG_INPUT2,
1019 		    "Peer does not support chunk type %d (0x%x).\n",
1020 		    chunk_type, chunk_type);
1021 		break;
1022 	}
1023 }
1024 
1025 /*
1026  * Skip past the param header and then we will find the param that caused the
1027  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1028  * these will turn of specific features.
1029  * XXX: Is this the right thing to do?
1030  */
1031 static void
1032 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1033 {
1034 	switch (parameter_type) {
1035 		/* pr-sctp draft */
1036 	case SCTP_PRSCTP_SUPPORTED:
1037 		stcb->asoc.prsctp_supported = 0;
1038 		break;
1039 	case SCTP_SUPPORTED_CHUNK_EXT:
1040 		break;
1041 		/* draft-ietf-tsvwg-addip-sctp */
1042 	case SCTP_HAS_NAT_SUPPORT:
1043 		stcb->asoc.peer_supports_nat = 0;
1044 		break;
1045 	case SCTP_ADD_IP_ADDRESS:
1046 	case SCTP_DEL_IP_ADDRESS:
1047 	case SCTP_SET_PRIM_ADDR:
1048 		stcb->asoc.asconf_supported = 0;
1049 		break;
1050 	case SCTP_SUCCESS_REPORT:
1051 	case SCTP_ERROR_CAUSE_IND:
1052 		SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1053 		SCTPDBG(SCTP_DEBUG_INPUT2,
1054 		    "Turning off ASCONF to this strange peer\n");
1055 		stcb->asoc.asconf_supported = 0;
1056 		break;
1057 	default:
1058 		SCTPDBG(SCTP_DEBUG_INPUT2,
1059 		    "Peer does not support param type %d (0x%x)??\n",
1060 		    parameter_type, parameter_type);
1061 		break;
1062 	}
1063 }
1064 
1065 static int
1066 sctp_handle_error(struct sctp_chunkhdr *ch,
1067     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1068 {
1069 	struct sctp_error_cause *cause;
1070 	struct sctp_association *asoc;
1071 	uint32_t remaining_length, adjust;
1072 	uint16_t code, cause_code, cause_length;
1073 
1074 	/* parse through all of the errors and process */
1075 	asoc = &stcb->asoc;
1076 	cause = (struct sctp_error_cause *)((caddr_t)ch +
1077 	    sizeof(struct sctp_chunkhdr));
1078 	remaining_length = ntohs(ch->chunk_length);
1079 	if (remaining_length > limit) {
1080 		remaining_length = limit;
1081 	}
1082 	if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1083 		remaining_length -= sizeof(struct sctp_chunkhdr);
1084 	} else {
1085 		remaining_length = 0;
1086 	}
1087 	code = 0;
1088 	while (remaining_length >= sizeof(struct sctp_error_cause)) {
1089 		/* Process an Error Cause */
1090 		cause_code = ntohs(cause->code);
1091 		cause_length = ntohs(cause->length);
1092 		if ((cause_length > remaining_length) || (cause_length == 0)) {
1093 			/* Invalid cause length, possibly due to truncation. */
1094 			SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1095 			    remaining_length, cause_length);
1096 			return (0);
1097 		}
1098 		if (code == 0) {
1099 			/* report the first error cause */
1100 			code = cause_code;
1101 		}
1102 		switch (cause_code) {
1103 		case SCTP_CAUSE_INVALID_STREAM:
1104 		case SCTP_CAUSE_MISSING_PARAM:
1105 		case SCTP_CAUSE_INVALID_PARAM:
1106 		case SCTP_CAUSE_NO_USER_DATA:
1107 			SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1108 			    cause_code);
1109 			break;
1110 		case SCTP_CAUSE_NAT_COLLIDING_STATE:
1111 			SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n",
1112 			    ch->chunk_flags);
1113 			if (sctp_handle_nat_colliding_state(stcb)) {
1114 				return (0);
1115 			}
1116 			break;
1117 		case SCTP_CAUSE_NAT_MISSING_STATE:
1118 			SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n",
1119 			    ch->chunk_flags);
1120 			if (sctp_handle_nat_missing_state(stcb, net)) {
1121 				return (0);
1122 			}
1123 			break;
1124 		case SCTP_CAUSE_STALE_COOKIE:
1125 			/*
1126 			 * We only act if we have echoed a cookie and are
1127 			 * waiting.
1128 			 */
1129 			if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1130 			    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1131 				struct sctp_error_stale_cookie *stale_cookie;
1132 
1133 				stale_cookie = (struct sctp_error_stale_cookie *)cause;
1134 				/* stable_time is in usec, convert to msec. */
1135 				asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time) / 1000;
1136 				/* Double it to be more robust on RTX. */
1137 				asoc->cookie_preserve_req *= 2;
1138 				asoc->stale_cookie_count++;
1139 				if (asoc->stale_cookie_count >
1140 				    asoc->max_init_times) {
1141 					sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED);
1142 					/* now free the asoc */
1143 					(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1144 					    SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1145 					return (-1);
1146 				}
1147 				/* blast back to INIT state */
1148 				sctp_toss_old_cookies(stcb, &stcb->asoc);
1149 				SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1150 				sctp_stop_all_cookie_timers(stcb);
1151 				sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1152 			}
1153 			break;
1154 		case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1155 			/*
1156 			 * Nothing we can do here, we don't do hostname
1157 			 * addresses so if the peer does not like my IPv6
1158 			 * (or IPv4 for that matter) it does not matter. If
1159 			 * they don't support that type of address, they can
1160 			 * NOT possibly get that packet type... i.e. with no
1161 			 * IPv6 you can't receive a IPv6 packet. so we can
1162 			 * safely ignore this one. If we ever added support
1163 			 * for HOSTNAME Addresses, then we would need to do
1164 			 * something here.
1165 			 */
1166 			break;
1167 		case SCTP_CAUSE_UNRECOG_CHUNK:
1168 			if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1169 				struct sctp_error_unrecognized_chunk *unrec_chunk;
1170 
1171 				unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1172 				sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
1173 			}
1174 			break;
1175 		case SCTP_CAUSE_UNRECOG_PARAM:
1176 			/* XXX: We only consider the first parameter */
1177 			if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1178 				struct sctp_paramhdr *unrec_parameter;
1179 
1180 				unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1181 				sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1182 			}
1183 			break;
1184 		case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1185 			/*
1186 			 * We ignore this since the timer will drive out a
1187 			 * new cookie anyway and there timer will drive us
1188 			 * to send a SHUTDOWN_COMPLETE. We can't send one
1189 			 * here since we don't have their tag.
1190 			 */
1191 			break;
1192 		case SCTP_CAUSE_DELETING_LAST_ADDR:
1193 		case SCTP_CAUSE_RESOURCE_SHORTAGE:
1194 		case SCTP_CAUSE_DELETING_SRC_ADDR:
1195 			/*
1196 			 * We should NOT get these here, but in a
1197 			 * ASCONF-ACK.
1198 			 */
1199 			SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1200 			    cause_code);
1201 			break;
1202 		case SCTP_CAUSE_OUT_OF_RESC:
1203 			/*
1204 			 * And what, pray tell do we do with the fact that
1205 			 * the peer is out of resources? Not really sure we
1206 			 * could do anything but abort. I suspect this
1207 			 * should have came WITH an abort instead of in a
1208 			 * OP-ERROR.
1209 			 */
1210 			break;
1211 		default:
1212 			SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1213 			    cause_code);
1214 			break;
1215 		}
1216 		adjust = SCTP_SIZE32(cause_length);
1217 		if (remaining_length >= adjust) {
1218 			remaining_length -= adjust;
1219 		} else {
1220 			remaining_length = 0;
1221 		}
1222 		cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1223 	}
1224 	sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1225 	return (0);
1226 }
1227 
1228 static int
1229 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1230     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1231     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1232     struct sctp_nets *net, int *abort_no_unlock,
1233     uint8_t mflowtype, uint32_t mflowid,
1234     uint32_t vrf_id)
1235 {
1236 	struct sctp_init_ack *init_ack;
1237 	struct mbuf *op_err;
1238 
1239 	SCTPDBG(SCTP_DEBUG_INPUT2,
1240 	    "sctp_handle_init_ack: handling INIT-ACK\n");
1241 
1242 	if (stcb == NULL) {
1243 		SCTPDBG(SCTP_DEBUG_INPUT2,
1244 		    "sctp_handle_init_ack: TCB is null\n");
1245 		return (-1);
1246 	}
1247 	/* Only process the INIT-ACK chunk in COOKIE WAIT state. */
1248 	if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
1249 		init_ack = &cp->init;
1250 		/* Validate parameters. */
1251 		if ((ntohl(init_ack->initiate_tag) == 0) ||
1252 		    (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) ||
1253 		    (ntohs(init_ack->num_inbound_streams) == 0) ||
1254 		    (ntohs(init_ack->num_outbound_streams) == 0)) {
1255 			/* One of the mandatory parameters is illegal. */
1256 			op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1257 			sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1258 			    src, dst, sh, op_err,
1259 			    mflowtype, mflowid,
1260 			    vrf_id, net->port);
1261 			*abort_no_unlock = 1;
1262 			return (-1);
1263 		}
1264 		if (stcb->asoc.primary_destination->dest_state &
1265 		    SCTP_ADDR_UNCONFIRMED) {
1266 			/*
1267 			 * The primary is where we sent the INIT, we can
1268 			 * always consider it confirmed when the INIT-ACK is
1269 			 * returned. Do this before we load addresses
1270 			 * though.
1271 			 */
1272 			stcb->asoc.primary_destination->dest_state &=
1273 			    ~SCTP_ADDR_UNCONFIRMED;
1274 			sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1275 			    stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1276 		}
1277 		if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1278 		    net, abort_no_unlock,
1279 		    mflowtype, mflowid,
1280 		    vrf_id) < 0) {
1281 			/* error in parsing parameters */
1282 			return (-1);
1283 		}
1284 		/* Update our state. */
1285 		SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1286 		SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1287 
1288 		/* Reset the RTO calculation. */
1289 		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1290 			sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1291 			    stcb->asoc.overall_error_count,
1292 			    0,
1293 			    SCTP_FROM_SCTP_INPUT,
1294 			    __LINE__);
1295 		}
1296 		stcb->asoc.overall_error_count = 0;
1297 		(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1298 		/*
1299 		 * Collapse the init timer back in case of a exponential
1300 		 * backoff.
1301 		 */
1302 		sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1303 		    stcb, net);
1304 		/*
1305 		 * The output routine at the end of the inbound data
1306 		 * processing will cause the cookie to be sent.
1307 		 */
1308 		SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1309 		return (0);
1310 	} else {
1311 		return (-1);
1312 	}
1313 }
1314 
1315 static struct sctp_tcb *
1316 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1317     struct sockaddr *src, struct sockaddr *dst,
1318     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1319     struct sctp_inpcb *inp, struct sctp_nets **netp,
1320     struct sockaddr *init_src, int *notification,
1321     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1322     uint8_t mflowtype, uint32_t mflowid,
1323     uint32_t vrf_id, uint16_t port);
1324 
1325 /*
1326  * handle a state cookie for an existing association m: input packet mbuf
1327  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1328  * "split" mbuf and the cookie signature does not exist offset: offset into
1329  * mbuf to the cookie-echo chunk
1330  */
1331 static struct sctp_tcb *
1332 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1333     struct sockaddr *src, struct sockaddr *dst,
1334     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1335     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1336     struct sockaddr *init_src, int *notification,
1337     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1338     uint8_t mflowtype, uint32_t mflowid,
1339     uint32_t vrf_id, uint16_t port)
1340 {
1341 	struct sctp_association *asoc;
1342 	struct sctp_init_chunk *init_cp, init_buf;
1343 	struct sctp_init_ack_chunk *initack_cp, initack_buf;
1344 	struct sctp_asconf_addr *aparam, *naparam;
1345 	struct sctp_asconf_ack *aack, *naack;
1346 	struct sctp_tmit_chunk *chk, *nchk;
1347 	struct sctp_stream_reset_list *strrst, *nstrrst;
1348 	struct sctp_queued_to_read *sq, *nsq;
1349 	struct sctp_nets *net;
1350 	struct mbuf *op_err;
1351 	struct timeval old;
1352 	int init_offset, initack_offset, i;
1353 	int retval;
1354 	int spec_flag = 0;
1355 	uint32_t how_indx;
1356 #if defined(SCTP_DETAILED_STR_STATS)
1357 	int j;
1358 #endif
1359 
1360 	net = *netp;
1361 	/* I know that the TCB is non-NULL from the caller */
1362 	asoc = &stcb->asoc;
1363 	for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1364 		if (asoc->cookie_how[how_indx] == 0)
1365 			break;
1366 	}
1367 	if (how_indx < sizeof(asoc->cookie_how)) {
1368 		asoc->cookie_how[how_indx] = 1;
1369 	}
1370 	if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1371 		/* SHUTDOWN came in after sending INIT-ACK */
1372 		sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1373 		op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1374 		sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1375 		    mflowtype, mflowid, inp->fibnum,
1376 		    vrf_id, net->port);
1377 		if (how_indx < sizeof(asoc->cookie_how))
1378 			asoc->cookie_how[how_indx] = 2;
1379 		SCTP_TCB_UNLOCK(stcb);
1380 		return (NULL);
1381 	}
1382 	/*
1383 	 * find and validate the INIT chunk in the cookie (peer's info) the
1384 	 * INIT should start after the cookie-echo header struct (chunk
1385 	 * header, state cookie header struct)
1386 	 */
1387 	init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1388 
1389 	init_cp = (struct sctp_init_chunk *)
1390 	    sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1391 	    (uint8_t *)&init_buf);
1392 	if (init_cp == NULL) {
1393 		/* could not pull a INIT chunk in cookie */
1394 		SCTP_TCB_UNLOCK(stcb);
1395 		return (NULL);
1396 	}
1397 	if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1398 		SCTP_TCB_UNLOCK(stcb);
1399 		return (NULL);
1400 	}
1401 	/*
1402 	 * find and validate the INIT-ACK chunk in the cookie (my info) the
1403 	 * INIT-ACK follows the INIT chunk
1404 	 */
1405 	initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1406 	initack_cp = (struct sctp_init_ack_chunk *)
1407 	    sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1408 	    (uint8_t *)&initack_buf);
1409 	if (initack_cp == NULL) {
1410 		/* could not pull INIT-ACK chunk in cookie */
1411 		SCTP_TCB_UNLOCK(stcb);
1412 		return (NULL);
1413 	}
1414 	if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1415 		SCTP_TCB_UNLOCK(stcb);
1416 		return (NULL);
1417 	}
1418 	if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1419 	    (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1420 		/*
1421 		 * case D in Section 5.2.4 Table 2: MMAA process accordingly
1422 		 * to get into the OPEN state
1423 		 */
1424 		if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1425 			/*-
1426 			 * Opps, this means that we somehow generated two vtag's
1427 			 * the same. I.e. we did:
1428 			 *  Us               Peer
1429 			 *   <---INIT(tag=a)------
1430 			 *   ----INIT-ACK(tag=t)-->
1431 			 *   ----INIT(tag=t)------> *1
1432 			 *   <---INIT-ACK(tag=a)---
1433 			 *   <----CE(tag=t)------------- *2
1434 			 *
1435 			 * At point *1 we should be generating a different
1436 			 * tag t'. Which means we would throw away the CE and send
1437 			 * ours instead. Basically this is case C (throw away side).
1438 			 */
1439 			if (how_indx < sizeof(asoc->cookie_how))
1440 				asoc->cookie_how[how_indx] = 17;
1441 			SCTP_TCB_UNLOCK(stcb);
1442 			return (NULL);
1443 		}
1444 		switch (SCTP_GET_STATE(stcb)) {
1445 		case SCTP_STATE_COOKIE_WAIT:
1446 		case SCTP_STATE_COOKIE_ECHOED:
1447 			/*
1448 			 * INIT was sent but got a COOKIE_ECHO with the
1449 			 * correct tags... just accept it...but we must
1450 			 * process the init so that we can make sure we have
1451 			 * the right seq no's.
1452 			 */
1453 			/* First we must process the INIT !! */
1454 			if (sctp_process_init(init_cp, stcb) < 0) {
1455 				if (how_indx < sizeof(asoc->cookie_how))
1456 					asoc->cookie_how[how_indx] = 3;
1457 				op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1458 				SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1459 				sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1460 				    src, dst, sh, op_err,
1461 				    mflowtype, mflowid,
1462 				    vrf_id, net->port);
1463 				return (NULL);
1464 			}
1465 			/* we have already processed the INIT so no problem */
1466 			sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1467 			    stcb, net,
1468 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1469 			sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1470 			    stcb, net,
1471 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1472 			/* update current state */
1473 			if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1474 				SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1475 			else
1476 				SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1477 
1478 			SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1479 			if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1480 				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1481 				    stcb->sctp_ep, stcb, NULL);
1482 			}
1483 			SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1484 			sctp_stop_all_cookie_timers(stcb);
1485 			if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1486 			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1487 			    (!SCTP_IS_LISTENING(inp))) {
1488 				/*
1489 				 * Here is where collision would go if we
1490 				 * did a connect() and instead got a
1491 				 * init/init-ack/cookie done before the
1492 				 * init-ack came back..
1493 				 */
1494 				stcb->sctp_ep->sctp_flags |=
1495 				    SCTP_PCB_FLAGS_CONNECTED;
1496 				soisconnected(stcb->sctp_socket);
1497 			}
1498 			/* notify upper layer */
1499 			*notification = SCTP_NOTIFY_ASSOC_UP;
1500 			/*
1501 			 * since we did not send a HB make sure we don't
1502 			 * double things
1503 			 */
1504 			old.tv_sec = cookie->time_entered.tv_sec;
1505 			old.tv_usec = cookie->time_entered.tv_usec;
1506 			net->hb_responded = 1;
1507 			sctp_calculate_rto(stcb, asoc, net, &old,
1508 			    SCTP_RTT_FROM_NON_DATA);
1509 
1510 			if (stcb->asoc.sctp_autoclose_ticks &&
1511 			    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1512 				sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1513 				    inp, stcb, NULL);
1514 			}
1515 			break;
1516 		default:
1517 			/*
1518 			 * we're in the OPEN state (or beyond), so peer must
1519 			 * have simply lost the COOKIE-ACK
1520 			 */
1521 			break;
1522 		}		/* end switch */
1523 		sctp_stop_all_cookie_timers(stcb);
1524 		if ((retval = sctp_load_addresses_from_init(stcb, m,
1525 		    init_offset + sizeof(struct sctp_init_chunk),
1526 		    initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1527 			if (how_indx < sizeof(asoc->cookie_how))
1528 				asoc->cookie_how[how_indx] = 4;
1529 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1530 			    "Problem with address parameters");
1531 			SCTPDBG(SCTP_DEBUG_INPUT1,
1532 			    "Load addresses from INIT causes an abort %d\n",
1533 			    retval);
1534 			sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1535 			    src, dst, sh, op_err,
1536 			    mflowtype, mflowid,
1537 			    vrf_id, net->port);
1538 			return (NULL);
1539 		}
1540 		/* respond with a COOKIE-ACK */
1541 		sctp_toss_old_cookies(stcb, asoc);
1542 		sctp_send_cookie_ack(stcb);
1543 		if (how_indx < sizeof(asoc->cookie_how))
1544 			asoc->cookie_how[how_indx] = 5;
1545 		return (stcb);
1546 	}
1547 
1548 	if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1549 	    ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1550 	    cookie->tie_tag_my_vtag == 0 &&
1551 	    cookie->tie_tag_peer_vtag == 0) {
1552 		/*
1553 		 * case C in Section 5.2.4 Table 2: XMOO silently discard
1554 		 */
1555 		if (how_indx < sizeof(asoc->cookie_how))
1556 			asoc->cookie_how[how_indx] = 6;
1557 		SCTP_TCB_UNLOCK(stcb);
1558 		return (NULL);
1559 	}
1560 	/*
1561 	 * If nat support, and the below and stcb is established, send back
1562 	 * a ABORT(colliding state) if we are established.
1563 	 */
1564 	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1565 	    (asoc->peer_supports_nat) &&
1566 	    ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1567 	    ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1568 	    (asoc->peer_vtag == 0)))) {
1569 		/*
1570 		 * Special case - Peer's support nat. We may have two init's
1571 		 * that we gave out the same tag on since one was not
1572 		 * established.. i.e. we get INIT from host-1 behind the nat
1573 		 * and we respond tag-a, we get a INIT from host-2 behind
1574 		 * the nat and we get tag-a again. Then we bring up host-1
1575 		 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1576 		 * Now we have colliding state. We must send an abort here
1577 		 * with colliding state indication.
1578 		 */
1579 		op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1580 		sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1581 		    mflowtype, mflowid, inp->fibnum,
1582 		    vrf_id, port);
1583 		SCTP_TCB_UNLOCK(stcb);
1584 		return (NULL);
1585 	}
1586 	if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1587 	    ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1588 	    (asoc->peer_vtag == 0))) {
1589 		/*
1590 		 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1591 		 * should be ok, re-accept peer info
1592 		 */
1593 		if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1594 			/*
1595 			 * Extension of case C. If we hit this, then the
1596 			 * random number generator returned the same vtag
1597 			 * when we first sent our INIT-ACK and when we later
1598 			 * sent our INIT. The side with the seq numbers that
1599 			 * are different will be the one that normnally
1600 			 * would have hit case C. This in effect "extends"
1601 			 * our vtags in this collision case to be 64 bits.
1602 			 * The same collision could occur aka you get both
1603 			 * vtag and seq number the same twice in a row.. but
1604 			 * is much less likely. If it did happen then we
1605 			 * would proceed through and bring up the assoc.. we
1606 			 * may end up with the wrong stream setup however..
1607 			 * which would be bad.. but there is no way to
1608 			 * tell.. until we send on a stream that does not
1609 			 * exist :-)
1610 			 */
1611 			if (how_indx < sizeof(asoc->cookie_how))
1612 				asoc->cookie_how[how_indx] = 7;
1613 
1614 			SCTP_TCB_UNLOCK(stcb);
1615 			return (NULL);
1616 		}
1617 		if (how_indx < sizeof(asoc->cookie_how))
1618 			asoc->cookie_how[how_indx] = 8;
1619 		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1620 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1621 		sctp_stop_all_cookie_timers(stcb);
1622 		/*
1623 		 * since we did not send a HB make sure we don't double
1624 		 * things
1625 		 */
1626 		net->hb_responded = 1;
1627 		if (stcb->asoc.sctp_autoclose_ticks &&
1628 		    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1629 			sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1630 			    NULL);
1631 		}
1632 		asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1633 		if (asoc->pre_open_streams < asoc->streamoutcnt) {
1634 			asoc->pre_open_streams = asoc->streamoutcnt;
1635 		}
1636 
1637 		if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1638 			/*
1639 			 * Ok the peer probably discarded our data (if we
1640 			 * echoed a cookie+data). So anything on the
1641 			 * sent_queue should be marked for retransmit, we
1642 			 * may not get something to kick us so it COULD
1643 			 * still take a timeout to move these.. but it can't
1644 			 * hurt to mark them.
1645 			 */
1646 
1647 			TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1648 				if (chk->sent < SCTP_DATAGRAM_RESEND) {
1649 					chk->sent = SCTP_DATAGRAM_RESEND;
1650 					sctp_flight_size_decrease(chk);
1651 					sctp_total_flight_decrease(stcb, chk);
1652 					sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1653 					spec_flag++;
1654 				}
1655 			}
1656 		}
1657 		/* process the INIT info (peer's info) */
1658 		if (sctp_process_init(init_cp, stcb) < 0) {
1659 			if (how_indx < sizeof(asoc->cookie_how))
1660 				asoc->cookie_how[how_indx] = 9;
1661 			op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1662 			SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1663 			sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1664 			    src, dst, sh, op_err,
1665 			    mflowtype, mflowid,
1666 			    vrf_id, net->port);
1667 			return (NULL);
1668 		}
1669 		if ((retval = sctp_load_addresses_from_init(stcb, m,
1670 		    init_offset + sizeof(struct sctp_init_chunk),
1671 		    initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1672 			if (how_indx < sizeof(asoc->cookie_how))
1673 				asoc->cookie_how[how_indx] = 10;
1674 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1675 			    "Problem with address parameters");
1676 			SCTPDBG(SCTP_DEBUG_INPUT1,
1677 			    "Load addresses from INIT causes an abort %d\n",
1678 			    retval);
1679 			sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1680 			    src, dst, sh, op_err,
1681 			    mflowtype, mflowid,
1682 			    vrf_id, net->port);
1683 			return (NULL);
1684 		}
1685 		if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1686 		    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1687 			*notification = SCTP_NOTIFY_ASSOC_UP;
1688 
1689 			if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1690 			    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1691 			    (!SCTP_IS_LISTENING(inp))) {
1692 				stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1693 				soisconnected(stcb->sctp_socket);
1694 			}
1695 			if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1696 				SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1697 			else
1698 				SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1699 			SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1700 		} else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1701 			SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1702 		} else {
1703 			SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1704 		}
1705 		SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1706 		if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1707 			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1708 			    stcb->sctp_ep, stcb, NULL);
1709 		}
1710 		sctp_stop_all_cookie_timers(stcb);
1711 		sctp_toss_old_cookies(stcb, asoc);
1712 		sctp_send_cookie_ack(stcb);
1713 		if (spec_flag) {
1714 			/*
1715 			 * only if we have retrans set do we do this. What
1716 			 * this call does is get only the COOKIE-ACK out and
1717 			 * then when we return the normal call to
1718 			 * sctp_chunk_output will get the retrans out behind
1719 			 * this.
1720 			 */
1721 			sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1722 		}
1723 		if (how_indx < sizeof(asoc->cookie_how))
1724 			asoc->cookie_how[how_indx] = 11;
1725 
1726 		return (stcb);
1727 	}
1728 	if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1729 	    ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1730 	    cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1731 	    cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1732 	    cookie->tie_tag_peer_vtag != 0) {
1733 		struct sctpasochead *head;
1734 
1735 		if (asoc->peer_supports_nat) {
1736 			struct sctp_tcb *local_stcb;
1737 
1738 			/*
1739 			 * This is a gross gross hack. Just call the
1740 			 * cookie_new code since we are allowing a duplicate
1741 			 * association. I hope this works...
1742 			 */
1743 			local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst,
1744 			    sh, cookie, cookie_len,
1745 			    inp, netp, init_src, notification,
1746 			    auth_skipped, auth_offset, auth_len,
1747 			    mflowtype, mflowid,
1748 			    vrf_id, port);
1749 			if (local_stcb == NULL) {
1750 				SCTP_TCB_UNLOCK(stcb);
1751 			}
1752 			return (local_stcb);
1753 		}
1754 		/*
1755 		 * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1756 		 */
1757 		/* temp code */
1758 		if (how_indx < sizeof(asoc->cookie_how))
1759 			asoc->cookie_how[how_indx] = 12;
1760 		sctp_stop_association_timers(stcb, false);
1761 		/* notify upper layer */
1762 		*notification = SCTP_NOTIFY_ASSOC_RESTART;
1763 		atomic_add_int(&stcb->asoc.refcnt, 1);
1764 		if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1765 		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1766 		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1767 			SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1768 		}
1769 		if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1770 			SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1771 		} else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1772 			SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1773 		}
1774 		if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1775 			SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1776 			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1777 			    stcb->sctp_ep, stcb, NULL);
1778 
1779 		} else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1780 			/* move to OPEN state, if not in SHUTDOWN_SENT */
1781 			SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1782 		}
1783 		if (asoc->pre_open_streams < asoc->streamoutcnt) {
1784 			asoc->pre_open_streams = asoc->streamoutcnt;
1785 		}
1786 		asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1787 		asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1788 		asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1789 		asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1790 		asoc->str_reset_seq_in = asoc->init_seq_number;
1791 		asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1792 		asoc->send_sack = 1;
1793 		asoc->data_pkts_seen = 0;
1794 		asoc->last_data_chunk_from = NULL;
1795 		asoc->last_control_chunk_from = NULL;
1796 		asoc->last_net_cmt_send_started = NULL;
1797 		if (asoc->mapping_array) {
1798 			memset(asoc->mapping_array, 0,
1799 			    asoc->mapping_array_size);
1800 		}
1801 		if (asoc->nr_mapping_array) {
1802 			memset(asoc->nr_mapping_array, 0,
1803 			    asoc->mapping_array_size);
1804 		}
1805 		SCTP_TCB_UNLOCK(stcb);
1806 		SCTP_INP_INFO_WLOCK();
1807 		SCTP_INP_WLOCK(stcb->sctp_ep);
1808 		SCTP_TCB_LOCK(stcb);
1809 		atomic_add_int(&stcb->asoc.refcnt, -1);
1810 		/* send up all the data */
1811 		SCTP_TCB_SEND_LOCK(stcb);
1812 
1813 		sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
1814 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1815 			stcb->asoc.strmout[i].chunks_on_queues = 0;
1816 #if defined(SCTP_DETAILED_STR_STATS)
1817 			for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1818 				asoc->strmout[i].abandoned_sent[j] = 0;
1819 				asoc->strmout[i].abandoned_unsent[j] = 0;
1820 			}
1821 #else
1822 			asoc->strmout[i].abandoned_sent[0] = 0;
1823 			asoc->strmout[i].abandoned_unsent[0] = 0;
1824 #endif
1825 			stcb->asoc.strmout[i].next_mid_ordered = 0;
1826 			stcb->asoc.strmout[i].next_mid_unordered = 0;
1827 			stcb->asoc.strmout[i].sid = i;
1828 			stcb->asoc.strmout[i].last_msg_incomplete = 0;
1829 		}
1830 		TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) {
1831 			TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp);
1832 			SCTP_FREE(strrst, SCTP_M_STRESET);
1833 		}
1834 		TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) {
1835 			TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next);
1836 			if (sq->data) {
1837 				sctp_m_freem(sq->data);
1838 				sq->data = NULL;
1839 			}
1840 			sctp_free_remote_addr(sq->whoFrom);
1841 			sq->whoFrom = NULL;
1842 			sq->stcb = NULL;
1843 			sctp_free_a_readq(stcb, sq);
1844 		}
1845 		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
1846 			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
1847 			if (chk->data) {
1848 				sctp_m_freem(chk->data);
1849 				chk->data = NULL;
1850 			}
1851 			if (chk->holds_key_ref)
1852 				sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1853 			sctp_free_remote_addr(chk->whoTo);
1854 			SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1855 			SCTP_DECR_CHK_COUNT();
1856 		}
1857 		asoc->ctrl_queue_cnt = 0;
1858 		asoc->str_reset = NULL;
1859 		asoc->stream_reset_outstanding = 0;
1860 		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
1861 			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
1862 			if (chk->data) {
1863 				sctp_m_freem(chk->data);
1864 				chk->data = NULL;
1865 			}
1866 			if (chk->holds_key_ref)
1867 				sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
1868 			sctp_free_remote_addr(chk->whoTo);
1869 			SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
1870 			SCTP_DECR_CHK_COUNT();
1871 		}
1872 		TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) {
1873 			TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
1874 			SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
1875 		}
1876 		TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) {
1877 			TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next);
1878 			if (aack->data != NULL) {
1879 				sctp_m_freem(aack->data);
1880 			}
1881 			SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack);
1882 		}
1883 
1884 		/* process the INIT-ACK info (my info) */
1885 		asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1886 		asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1887 
1888 		/* pull from vtag hash */
1889 		LIST_REMOVE(stcb, sctp_asocs);
1890 		/* re-insert to new vtag position */
1891 		head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1892 		    SCTP_BASE_INFO(hashasocmark))];
1893 		/*
1894 		 * put it in the bucket in the vtag hash of assoc's for the
1895 		 * system
1896 		 */
1897 		LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1898 
1899 		SCTP_TCB_SEND_UNLOCK(stcb);
1900 		SCTP_INP_WUNLOCK(stcb->sctp_ep);
1901 		SCTP_INP_INFO_WUNLOCK();
1902 		asoc->total_flight = 0;
1903 		asoc->total_flight_count = 0;
1904 		/* process the INIT info (peer's info) */
1905 		if (sctp_process_init(init_cp, stcb) < 0) {
1906 			if (how_indx < sizeof(asoc->cookie_how))
1907 				asoc->cookie_how[how_indx] = 13;
1908 			op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
1909 			SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
1910 			sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1911 			    src, dst, sh, op_err,
1912 			    mflowtype, mflowid,
1913 			    vrf_id, net->port);
1914 			return (NULL);
1915 		}
1916 		/*
1917 		 * since we did not send a HB make sure we don't double
1918 		 * things
1919 		 */
1920 		net->hb_responded = 1;
1921 
1922 		if ((retval = sctp_load_addresses_from_init(stcb, m,
1923 		    init_offset + sizeof(struct sctp_init_chunk),
1924 		    initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
1925 			if (how_indx < sizeof(asoc->cookie_how))
1926 				asoc->cookie_how[how_indx] = 14;
1927 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
1928 			    "Problem with address parameters");
1929 			SCTPDBG(SCTP_DEBUG_INPUT1,
1930 			    "Load addresses from INIT causes an abort %d\n",
1931 			    retval);
1932 			sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1933 			    src, dst, sh, op_err,
1934 			    mflowtype, mflowid,
1935 			    vrf_id, net->port);
1936 			return (NULL);
1937 		}
1938 		/* respond with a COOKIE-ACK */
1939 		sctp_send_cookie_ack(stcb);
1940 		if (how_indx < sizeof(asoc->cookie_how))
1941 			asoc->cookie_how[how_indx] = 15;
1942 		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) &&
1943 		    (asoc->sctp_autoclose_ticks > 0)) {
1944 			sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
1945 		}
1946 		return (stcb);
1947 	}
1948 	if (how_indx < sizeof(asoc->cookie_how))
1949 		asoc->cookie_how[how_indx] = 16;
1950 	/* all other cases... */
1951 	SCTP_TCB_UNLOCK(stcb);
1952 	return (NULL);
1953 }
1954 
1955 /*
1956  * handle a state cookie for a new association m: input packet mbuf chain--
1957  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
1958  * and the cookie signature does not exist offset: offset into mbuf to the
1959  * cookie-echo chunk length: length of the cookie chunk to: where the init
1960  * was from returns a new TCB
1961  */
1962 static struct sctp_tcb *
1963 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1964     struct sockaddr *src, struct sockaddr *dst,
1965     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1966     struct sctp_inpcb *inp, struct sctp_nets **netp,
1967     struct sockaddr *init_src, int *notification,
1968     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1969     uint8_t mflowtype, uint32_t mflowid,
1970     uint32_t vrf_id, uint16_t port)
1971 {
1972 	struct sctp_tcb *stcb;
1973 	struct sctp_init_chunk *init_cp, init_buf;
1974 	struct sctp_init_ack_chunk *initack_cp, initack_buf;
1975 	union sctp_sockstore store;
1976 	struct sctp_association *asoc;
1977 	int init_offset, initack_offset, initack_limit;
1978 	int retval;
1979 	int error = 0;
1980 	uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
1981 
1982 	/*
1983 	 * find and validate the INIT chunk in the cookie (peer's info) the
1984 	 * INIT should start after the cookie-echo header struct (chunk
1985 	 * header, state cookie header struct)
1986 	 */
1987 	init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1988 	init_cp = (struct sctp_init_chunk *)
1989 	    sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1990 	    (uint8_t *)&init_buf);
1991 	if (init_cp == NULL) {
1992 		/* could not pull a INIT chunk in cookie */
1993 		SCTPDBG(SCTP_DEBUG_INPUT1,
1994 		    "process_cookie_new: could not pull INIT chunk hdr\n");
1995 		return (NULL);
1996 	}
1997 	if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1998 		SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
1999 		return (NULL);
2000 	}
2001 	initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2002 	/*
2003 	 * find and validate the INIT-ACK chunk in the cookie (my info) the
2004 	 * INIT-ACK follows the INIT chunk
2005 	 */
2006 	initack_cp = (struct sctp_init_ack_chunk *)
2007 	    sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2008 	    (uint8_t *)&initack_buf);
2009 	if (initack_cp == NULL) {
2010 		/* could not pull INIT-ACK chunk in cookie */
2011 		SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2012 		return (NULL);
2013 	}
2014 	if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2015 		return (NULL);
2016 	}
2017 	/*
2018 	 * NOTE: We can't use the INIT_ACK's chk_length to determine the
2019 	 * "initack_limit" value.  This is because the chk_length field
2020 	 * includes the length of the cookie, but the cookie is omitted when
2021 	 * the INIT and INIT_ACK are tacked onto the cookie...
2022 	 */
2023 	initack_limit = offset + cookie_len;
2024 
2025 	/*
2026 	 * now that we know the INIT/INIT-ACK are in place, create a new TCB
2027 	 * and popluate
2028 	 */
2029 
2030 	/*
2031 	 * Here we do a trick, we set in NULL for the proc/thread argument.
2032 	 * We do this since in effect we only use the p argument when the
2033 	 * socket is unbound and we must do an implicit bind. Since we are
2034 	 * getting a cookie, we cannot be unbound.
2035 	 */
2036 	stcb = sctp_aloc_assoc(inp, init_src, &error,
2037 	    ntohl(initack_cp->init.initiate_tag),
2038 	    ntohl(initack_cp->init.initial_tsn), vrf_id,
2039 	    ntohs(initack_cp->init.num_outbound_streams),
2040 	    port,
2041 	    (struct thread *)NULL,
2042 	    SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2043 	if (stcb == NULL) {
2044 		struct mbuf *op_err;
2045 
2046 		/* memory problem? */
2047 		SCTPDBG(SCTP_DEBUG_INPUT1,
2048 		    "process_cookie_new: no room for another TCB!\n");
2049 		op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2050 		sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2051 		    src, dst, sh, op_err,
2052 		    mflowtype, mflowid,
2053 		    vrf_id, port);
2054 		return (NULL);
2055 	}
2056 	asoc = &stcb->asoc;
2057 	/* get scope variables out of cookie */
2058 	asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2059 	asoc->scope.site_scope = cookie->site_scope;
2060 	asoc->scope.local_scope = cookie->local_scope;
2061 	asoc->scope.loopback_scope = cookie->loopback_scope;
2062 
2063 	if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2064 	    (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2065 		struct mbuf *op_err;
2066 
2067 		/*
2068 		 * Houston we have a problem. The EP changed while the
2069 		 * cookie was in flight. Only recourse is to abort the
2070 		 * association.
2071 		 */
2072 		op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2073 		sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2074 		    src, dst, sh, op_err,
2075 		    mflowtype, mflowid,
2076 		    vrf_id, port);
2077 		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2078 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2079 		return (NULL);
2080 	}
2081 	/* process the INIT-ACK info (my info) */
2082 	asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2083 
2084 	/* process the INIT info (peer's info) */
2085 	if (sctp_process_init(init_cp, stcb) < 0) {
2086 		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2087 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2088 		return (NULL);
2089 	}
2090 	/* load all addresses */
2091 	if ((retval = sctp_load_addresses_from_init(stcb, m,
2092 	    init_offset + sizeof(struct sctp_init_chunk),
2093 	    initack_offset, src, dst, init_src, port)) < 0) {
2094 		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2095 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2096 		return (NULL);
2097 	}
2098 	/*
2099 	 * verify any preceding AUTH chunk that was skipped
2100 	 */
2101 	/* pull the local authentication parameters from the cookie/init-ack */
2102 	sctp_auth_get_cookie_params(stcb, m,
2103 	    initack_offset + sizeof(struct sctp_init_ack_chunk),
2104 	    initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2105 	if (auth_skipped) {
2106 		struct sctp_auth_chunk *auth;
2107 
2108 		if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
2109 			auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2110 		} else {
2111 			auth = NULL;
2112 		}
2113 		if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2114 			/* auth HMAC failed, dump the assoc and packet */
2115 			SCTPDBG(SCTP_DEBUG_AUTH1,
2116 			    "COOKIE-ECHO: AUTH failed\n");
2117 			(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2118 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2119 			return (NULL);
2120 		} else {
2121 			/* remaining chunks checked... good to go */
2122 			stcb->asoc.authenticated = 1;
2123 		}
2124 	}
2125 
2126 	/*
2127 	 * if we're doing ASCONFs, check to see if we have any new local
2128 	 * addresses that need to get added to the peer (eg. addresses
2129 	 * changed while cookie echo in flight).  This needs to be done
2130 	 * after we go to the OPEN state to do the correct asconf
2131 	 * processing. else, make sure we have the correct addresses in our
2132 	 * lists
2133 	 */
2134 
2135 	/* warning, we re-use sin, sin6, sa_store here! */
2136 	/* pull in local_address (our "from" address) */
2137 	switch (cookie->laddr_type) {
2138 #ifdef INET
2139 	case SCTP_IPV4_ADDRESS:
2140 		/* source addr is IPv4 */
2141 		memset(&store.sin, 0, sizeof(struct sockaddr_in));
2142 		store.sin.sin_family = AF_INET;
2143 		store.sin.sin_len = sizeof(struct sockaddr_in);
2144 		store.sin.sin_addr.s_addr = cookie->laddress[0];
2145 		break;
2146 #endif
2147 #ifdef INET6
2148 	case SCTP_IPV6_ADDRESS:
2149 		/* source addr is IPv6 */
2150 		memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2151 		store.sin6.sin6_family = AF_INET6;
2152 		store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2153 		store.sin6.sin6_scope_id = cookie->scope_id;
2154 		memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2155 		break;
2156 #endif
2157 	default:
2158 		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2159 		    SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2160 		return (NULL);
2161 	}
2162 
2163 	/* update current state */
2164 	SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2165 	SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2166 	if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2167 		sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2168 		    stcb->sctp_ep, stcb, NULL);
2169 	}
2170 	sctp_stop_all_cookie_timers(stcb);
2171 	SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2172 	SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2173 
2174 	/* set up to notify upper layer */
2175 	*notification = SCTP_NOTIFY_ASSOC_UP;
2176 	if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2177 	    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2178 	    (!SCTP_IS_LISTENING(inp))) {
2179 		/*
2180 		 * This is an endpoint that called connect() how it got a
2181 		 * cookie that is NEW is a bit of a mystery. It must be that
2182 		 * the INIT was sent, but before it got there.. a complete
2183 		 * INIT/INIT-ACK/COOKIE arrived. But of course then it
2184 		 * should have went to the other code.. not here.. oh well..
2185 		 * a bit of protection is worth having..
2186 		 */
2187 		stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2188 		soisconnected(stcb->sctp_socket);
2189 	} else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2190 	    (SCTP_IS_LISTENING(inp))) {
2191 		/*
2192 		 * We don't want to do anything with this one. Since it is
2193 		 * the listening guy. The timer will get started for
2194 		 * accepted connections in the caller.
2195 		 */
2196 		;
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 	*netp = sctp_findnet(stcb, init_src);
2204 	if (*netp != NULL) {
2205 		struct timeval old;
2206 
2207 		/*
2208 		 * Since we did not send a HB, make sure we don't double
2209 		 * things.
2210 		 */
2211 		(*netp)->hb_responded = 1;
2212 		/* Calculate the RTT. */
2213 		old.tv_sec = cookie->time_entered.tv_sec;
2214 		old.tv_usec = cookie->time_entered.tv_usec;
2215 		sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
2216 	}
2217 	/* respond with a COOKIE-ACK */
2218 	sctp_send_cookie_ack(stcb);
2219 
2220 	/*
2221 	 * check the address lists for any ASCONFs that need to be sent
2222 	 * AFTER the cookie-ack is sent
2223 	 */
2224 	sctp_check_address_list(stcb, m,
2225 	    initack_offset + sizeof(struct sctp_init_ack_chunk),
2226 	    initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2227 	    &store.sa, cookie->local_scope, cookie->site_scope,
2228 	    cookie->ipv4_scope, cookie->loopback_scope);
2229 
2230 	return (stcb);
2231 }
2232 
2233 /*
2234  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2235  * we NEED to make sure we are not already using the vtag. If so we
2236  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2237 	head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2238 							    SCTP_BASE_INFO(hashasocmark))];
2239 	LIST_FOREACH(stcb, head, sctp_asocs) {
2240 	        if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2241 		       -- SEND ABORT - TRY AGAIN --
2242 		}
2243 	}
2244 */
2245 
2246 /*
2247  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2248  * existing (non-NULL) TCB
2249  */
2250 static struct mbuf *
2251 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2252     struct sockaddr *src, struct sockaddr *dst,
2253     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2254     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2255     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2256     struct sctp_tcb **locked_tcb,
2257     uint8_t mflowtype, uint32_t mflowid,
2258     uint32_t vrf_id, uint16_t port)
2259 {
2260 	struct sctp_state_cookie *cookie;
2261 	struct sctp_tcb *l_stcb = *stcb;
2262 	struct sctp_inpcb *l_inp;
2263 	struct sockaddr *to;
2264 	struct sctp_pcb *ep;
2265 	struct mbuf *m_sig;
2266 	uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2267 	uint8_t *sig;
2268 	uint8_t cookie_ok = 0;
2269 	unsigned int sig_offset, cookie_offset;
2270 	unsigned int cookie_len;
2271 	struct timeval now;
2272 	struct timeval time_entered, time_expires;
2273 	int notification = 0;
2274 	struct sctp_nets *netl;
2275 	int had_a_existing_tcb = 0;
2276 	int send_int_conf = 0;
2277 #ifdef INET
2278 	struct sockaddr_in sin;
2279 #endif
2280 #ifdef INET6
2281 	struct sockaddr_in6 sin6;
2282 #endif
2283 
2284 	SCTPDBG(SCTP_DEBUG_INPUT2,
2285 	    "sctp_handle_cookie: handling COOKIE-ECHO\n");
2286 
2287 	if (inp_p == NULL) {
2288 		return (NULL);
2289 	}
2290 	cookie = &cp->cookie;
2291 	cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2292 	cookie_len = ntohs(cp->ch.chunk_length);
2293 
2294 	if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2295 	    sizeof(struct sctp_init_chunk) +
2296 	    sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2297 		/* cookie too small */
2298 		return (NULL);
2299 	}
2300 	if ((cookie->peerport != sh->src_port) ||
2301 	    (cookie->myport != sh->dest_port) ||
2302 	    (cookie->my_vtag != sh->v_tag)) {
2303 		/*
2304 		 * invalid ports or bad tag.  Note that we always leave the
2305 		 * v_tag in the header in network order and when we stored
2306 		 * it in the my_vtag slot we also left it in network order.
2307 		 * This maintains the match even though it may be in the
2308 		 * opposite byte order of the machine :->
2309 		 */
2310 		return (NULL);
2311 	}
2312 	/*
2313 	 * split off the signature into its own mbuf (since it should not be
2314 	 * calculated in the sctp_hmac_m() call).
2315 	 */
2316 	sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2317 	m_sig = m_split(m, sig_offset, M_NOWAIT);
2318 	if (m_sig == NULL) {
2319 		/* out of memory or ?? */
2320 		return (NULL);
2321 	}
2322 #ifdef SCTP_MBUF_LOGGING
2323 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2324 		sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2325 	}
2326 #endif
2327 
2328 	/*
2329 	 * compute the signature/digest for the cookie
2330 	 */
2331 	ep = &(*inp_p)->sctp_ep;
2332 	l_inp = *inp_p;
2333 	if (l_stcb) {
2334 		SCTP_TCB_UNLOCK(l_stcb);
2335 	}
2336 	SCTP_INP_RLOCK(l_inp);
2337 	if (l_stcb) {
2338 		SCTP_TCB_LOCK(l_stcb);
2339 	}
2340 	/* which cookie is it? */
2341 	if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2342 	    (ep->current_secret_number != ep->last_secret_number)) {
2343 		/* it's the old cookie */
2344 		(void)sctp_hmac_m(SCTP_HMAC,
2345 		    (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2346 		    SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2347 	} else {
2348 		/* it's the current cookie */
2349 		(void)sctp_hmac_m(SCTP_HMAC,
2350 		    (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2351 		    SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2352 	}
2353 	/* get the signature */
2354 	SCTP_INP_RUNLOCK(l_inp);
2355 	sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2356 	if (sig == NULL) {
2357 		/* couldn't find signature */
2358 		sctp_m_freem(m_sig);
2359 		return (NULL);
2360 	}
2361 	/* compare the received digest with the computed digest */
2362 	if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2363 		/* try the old cookie? */
2364 		if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2365 		    (ep->current_secret_number != ep->last_secret_number)) {
2366 			/* compute digest with old */
2367 			(void)sctp_hmac_m(SCTP_HMAC,
2368 			    (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2369 			    SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2370 			/* compare */
2371 			if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2372 				cookie_ok = 1;
2373 		}
2374 	} else {
2375 		cookie_ok = 1;
2376 	}
2377 
2378 	/*
2379 	 * Now before we continue we must reconstruct our mbuf so that
2380 	 * normal processing of any other chunks will work.
2381 	 */
2382 	{
2383 		struct mbuf *m_at;
2384 
2385 		m_at = m;
2386 		while (SCTP_BUF_NEXT(m_at) != NULL) {
2387 			m_at = SCTP_BUF_NEXT(m_at);
2388 		}
2389 		SCTP_BUF_NEXT(m_at) = m_sig;
2390 	}
2391 
2392 	if (cookie_ok == 0) {
2393 		SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2394 		SCTPDBG(SCTP_DEBUG_INPUT2,
2395 		    "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2396 		    (uint32_t)offset, cookie_offset, sig_offset);
2397 		return (NULL);
2398 	}
2399 
2400 	if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) {
2401 		SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n");
2402 		return (NULL);
2403 	}
2404 	time_entered.tv_sec = cookie->time_entered.tv_sec;
2405 	time_entered.tv_usec = cookie->time_entered.tv_usec;
2406 	if ((time_entered.tv_sec < 0) ||
2407 	    (time_entered.tv_usec < 0) ||
2408 	    (time_entered.tv_usec >= 1000000)) {
2409 		/* Invalid time stamp. Cookie must have been modified. */
2410 		SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n");
2411 		return (NULL);
2412 	}
2413 	(void)SCTP_GETTIME_TIMEVAL(&now);
2414 	if (timevalcmp(&now, &time_entered, <)) {
2415 		SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n");
2416 		return (NULL);
2417 	}
2418 	/*
2419 	 * Check the cookie timestamps to be sure it's not stale.
2420 	 * cookie_life is in ticks, so we convert to seconds.
2421 	 */
2422 	time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
2423 	time_expires.tv_usec = time_entered.tv_usec;
2424 	if (timevalcmp(&now, &time_expires, >)) {
2425 		/* cookie is stale! */
2426 		struct mbuf *op_err;
2427 		struct sctp_error_stale_cookie *cause;
2428 		struct timeval diff;
2429 		uint32_t staleness;
2430 
2431 		op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2432 		    0, M_NOWAIT, 1, MT_DATA);
2433 		if (op_err == NULL) {
2434 			/* FOOBAR */
2435 			return (NULL);
2436 		}
2437 		/* Set the len */
2438 		SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2439 		cause = mtod(op_err, struct sctp_error_stale_cookie *);
2440 		cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2441 		cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie));
2442 		diff = now;
2443 		timevalsub(&diff, &time_expires);
2444 		if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2445 			staleness = UINT32_MAX;
2446 		} else {
2447 			staleness = diff.tv_sec * 1000000;
2448 		}
2449 		if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2450 			staleness += diff.tv_usec;
2451 		} else {
2452 			staleness = UINT32_MAX;
2453 		}
2454 		cause->stale_time = htonl(staleness);
2455 		sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2456 		    mflowtype, mflowid, l_inp->fibnum,
2457 		    vrf_id, port);
2458 		return (NULL);
2459 	}
2460 	/*
2461 	 * Now we must see with the lookup address if we have an existing
2462 	 * asoc. This will only happen if we were in the COOKIE-WAIT state
2463 	 * and a INIT collided with us and somewhere the peer sent the
2464 	 * cookie on another address besides the single address our assoc
2465 	 * had for him. In this case we will have one of the tie-tags set at
2466 	 * least AND the address field in the cookie can be used to look it
2467 	 * up.
2468 	 */
2469 	to = NULL;
2470 	switch (cookie->addr_type) {
2471 #ifdef INET6
2472 	case SCTP_IPV6_ADDRESS:
2473 		memset(&sin6, 0, sizeof(sin6));
2474 		sin6.sin6_family = AF_INET6;
2475 		sin6.sin6_len = sizeof(sin6);
2476 		sin6.sin6_port = sh->src_port;
2477 		sin6.sin6_scope_id = cookie->scope_id;
2478 		memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2479 		    sizeof(sin6.sin6_addr.s6_addr));
2480 		to = (struct sockaddr *)&sin6;
2481 		break;
2482 #endif
2483 #ifdef INET
2484 	case SCTP_IPV4_ADDRESS:
2485 		memset(&sin, 0, sizeof(sin));
2486 		sin.sin_family = AF_INET;
2487 		sin.sin_len = sizeof(sin);
2488 		sin.sin_port = sh->src_port;
2489 		sin.sin_addr.s_addr = cookie->address[0];
2490 		to = (struct sockaddr *)&sin;
2491 		break;
2492 #endif
2493 	default:
2494 		/* This should not happen */
2495 		return (NULL);
2496 	}
2497 	if (*stcb == NULL) {
2498 		/* Yep, lets check */
2499 		*stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2500 		if (*stcb == NULL) {
2501 			/*
2502 			 * We should have only got back the same inp. If we
2503 			 * got back a different ep we have a problem. The
2504 			 * original findep got back l_inp and now
2505 			 */
2506 			if (l_inp != *inp_p) {
2507 				SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2508 			}
2509 		} else {
2510 			if (*locked_tcb == NULL) {
2511 				/*
2512 				 * In this case we found the assoc only
2513 				 * after we locked the create lock. This
2514 				 * means we are in a colliding case and we
2515 				 * must make sure that we unlock the tcb if
2516 				 * its one of the cases where we throw away
2517 				 * the incoming packets.
2518 				 */
2519 				*locked_tcb = *stcb;
2520 
2521 				/*
2522 				 * We must also increment the inp ref count
2523 				 * since the ref_count flags was set when we
2524 				 * did not find the TCB, now we found it
2525 				 * which reduces the refcount.. we must
2526 				 * raise it back out to balance it all :-)
2527 				 */
2528 				SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2529 				if ((*stcb)->sctp_ep != l_inp) {
2530 					SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2531 					    (void *)(*stcb)->sctp_ep, (void *)l_inp);
2532 				}
2533 			}
2534 		}
2535 	}
2536 
2537 	cookie_len -= SCTP_SIGNATURE_SIZE;
2538 	if (*stcb == NULL) {
2539 		/* this is the "normal" case... get a new TCB */
2540 		*stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2541 		    cookie, cookie_len, *inp_p,
2542 		    netp, to, &notification,
2543 		    auth_skipped, auth_offset, auth_len,
2544 		    mflowtype, mflowid,
2545 		    vrf_id, port);
2546 	} else {
2547 		/* this is abnormal... cookie-echo on existing TCB */
2548 		had_a_existing_tcb = 1;
2549 		*stcb = sctp_process_cookie_existing(m, iphlen, offset,
2550 		    src, dst, sh,
2551 		    cookie, cookie_len, *inp_p, *stcb, netp, to,
2552 		    &notification, auth_skipped, auth_offset, auth_len,
2553 		    mflowtype, mflowid,
2554 		    vrf_id, port);
2555 		if (*stcb == NULL) {
2556 			*locked_tcb = NULL;
2557 		}
2558 	}
2559 
2560 	if (*stcb == NULL) {
2561 		/* still no TCB... must be bad cookie-echo */
2562 		return (NULL);
2563 	}
2564 	if (*netp != NULL) {
2565 		(*netp)->flowtype = mflowtype;
2566 		(*netp)->flowid = mflowid;
2567 	}
2568 	/*
2569 	 * Ok, we built an association so confirm the address we sent the
2570 	 * INIT-ACK to.
2571 	 */
2572 	netl = sctp_findnet(*stcb, to);
2573 	/*
2574 	 * This code should in theory NOT run but
2575 	 */
2576 	if (netl == NULL) {
2577 		/* TSNH! Huh, why do I need to add this address here? */
2578 		if (sctp_add_remote_addr(*stcb, to, NULL, port,
2579 		    SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2580 			return (NULL);
2581 		}
2582 		netl = sctp_findnet(*stcb, to);
2583 	}
2584 	if (netl) {
2585 		if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2586 			netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2587 			(void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2588 			    netl);
2589 			send_int_conf = 1;
2590 		}
2591 	}
2592 	sctp_start_net_timers(*stcb);
2593 	if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2594 		if (!had_a_existing_tcb ||
2595 		    (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2596 			/*
2597 			 * If we have a NEW cookie or the connect never
2598 			 * reached the connected state during collision we
2599 			 * must do the TCP accept thing.
2600 			 */
2601 			struct socket *so, *oso;
2602 			struct sctp_inpcb *inp;
2603 
2604 			if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2605 				/*
2606 				 * For a restart we will keep the same
2607 				 * socket, no need to do anything. I THINK!!
2608 				 */
2609 				sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2610 				if (send_int_conf) {
2611 					sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2612 					    (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2613 				}
2614 				return (m);
2615 			}
2616 			oso = (*inp_p)->sctp_socket;
2617 			atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2618 			SCTP_TCB_UNLOCK((*stcb));
2619 			CURVNET_SET(oso->so_vnet);
2620 			so = sonewconn(oso, 0
2621 			    );
2622 			CURVNET_RESTORE();
2623 			SCTP_TCB_LOCK((*stcb));
2624 			atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2625 
2626 			if (so == NULL) {
2627 				struct mbuf *op_err;
2628 
2629 				/* Too many sockets */
2630 				SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2631 				op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2632 				sctp_abort_association(*inp_p, NULL, m, iphlen,
2633 				    src, dst, sh, op_err,
2634 				    mflowtype, mflowid,
2635 				    vrf_id, port);
2636 				(void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2637 				    SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2638 				return (NULL);
2639 			}
2640 			inp = (struct sctp_inpcb *)so->so_pcb;
2641 			SCTP_INP_INCR_REF(inp);
2642 			/*
2643 			 * We add the unbound flag here so that if we get an
2644 			 * soabort() before we get the move_pcb done, we
2645 			 * will properly cleanup.
2646 			 */
2647 			inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2648 			    SCTP_PCB_FLAGS_CONNECTED |
2649 			    SCTP_PCB_FLAGS_IN_TCPPOOL |
2650 			    SCTP_PCB_FLAGS_UNBOUND |
2651 			    (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2652 			    SCTP_PCB_FLAGS_DONT_WAKE);
2653 			inp->sctp_features = (*inp_p)->sctp_features;
2654 			inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2655 			inp->sctp_socket = so;
2656 			inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2657 			inp->max_cwnd = (*inp_p)->max_cwnd;
2658 			inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2659 			inp->ecn_supported = (*inp_p)->ecn_supported;
2660 			inp->prsctp_supported = (*inp_p)->prsctp_supported;
2661 			inp->auth_supported = (*inp_p)->auth_supported;
2662 			inp->asconf_supported = (*inp_p)->asconf_supported;
2663 			inp->reconfig_supported = (*inp_p)->reconfig_supported;
2664 			inp->nrsack_supported = (*inp_p)->nrsack_supported;
2665 			inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2666 			inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2667 			inp->sctp_context = (*inp_p)->sctp_context;
2668 			inp->local_strreset_support = (*inp_p)->local_strreset_support;
2669 			inp->fibnum = (*inp_p)->fibnum;
2670 			/*
2671 			 * copy in the authentication parameters from the
2672 			 * original endpoint
2673 			 */
2674 			if (inp->sctp_ep.local_hmacs)
2675 				sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2676 			inp->sctp_ep.local_hmacs =
2677 			    sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2678 			if (inp->sctp_ep.local_auth_chunks)
2679 				sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2680 			inp->sctp_ep.local_auth_chunks =
2681 			    sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2682 
2683 			/*
2684 			 * Now we must move it from one hash table to
2685 			 * another and get the tcb in the right place.
2686 			 */
2687 
2688 			/*
2689 			 * This is where the one-2-one socket is put into
2690 			 * the accept state waiting for the accept!
2691 			 */
2692 			if (*stcb) {
2693 				SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2694 			}
2695 			sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2696 
2697 			atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2698 			SCTP_TCB_UNLOCK((*stcb));
2699 
2700 			sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2701 			    0);
2702 			SCTP_TCB_LOCK((*stcb));
2703 			atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2704 
2705 			/*
2706 			 * now we must check to see if we were aborted while
2707 			 * the move was going on and the lock/unlock
2708 			 * happened.
2709 			 */
2710 			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2711 				/*
2712 				 * yep it was, we leave the assoc attached
2713 				 * to the socket since the sctp_inpcb_free()
2714 				 * call will send an abort for us.
2715 				 */
2716 				SCTP_INP_DECR_REF(inp);
2717 				return (NULL);
2718 			}
2719 			SCTP_INP_DECR_REF(inp);
2720 			/* Switch over to the new guy */
2721 			*inp_p = inp;
2722 			sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2723 			if (send_int_conf) {
2724 				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2725 				    (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2726 			}
2727 
2728 			/*
2729 			 * Pull it from the incomplete queue and wake the
2730 			 * guy
2731 			 */
2732 			soisconnected(so);
2733 			return (m);
2734 		}
2735 	}
2736 	if (notification) {
2737 		sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2738 	}
2739 	if (send_int_conf) {
2740 		sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2741 		    (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2742 	}
2743 	return (m);
2744 }
2745 
2746 static void
2747 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2748     struct sctp_tcb *stcb, struct sctp_nets *net)
2749 {
2750 	/* cp must not be used, others call this without a c-ack :-) */
2751 	struct sctp_association *asoc;
2752 	struct sctp_tmit_chunk *chk;
2753 
2754 	SCTPDBG(SCTP_DEBUG_INPUT2,
2755 	    "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2756 	if ((stcb == NULL) || (net == NULL)) {
2757 		return;
2758 	}
2759 
2760 	asoc = &stcb->asoc;
2761 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2762 		sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2763 		    asoc->overall_error_count,
2764 		    0,
2765 		    SCTP_FROM_SCTP_INPUT,
2766 		    __LINE__);
2767 	}
2768 	asoc->overall_error_count = 0;
2769 	sctp_stop_all_cookie_timers(stcb);
2770 	/* process according to association state */
2771 	if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2772 		/* state change only needed when I am in right state */
2773 		SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2774 		SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2775 		sctp_start_net_timers(stcb);
2776 		if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2777 			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2778 			    stcb->sctp_ep, stcb, NULL);
2779 		}
2780 		/* update RTO */
2781 		SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2782 		SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2783 		if (asoc->overall_error_count == 0) {
2784 			sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2785 			    SCTP_RTT_FROM_NON_DATA);
2786 		}
2787 		(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2788 		sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2789 		if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2790 		    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2791 			stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2792 			if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2793 				soisconnected(stcb->sctp_socket);
2794 			}
2795 		}
2796 		/*
2797 		 * since we did not send a HB make sure we don't double
2798 		 * things
2799 		 */
2800 		net->hb_responded = 1;
2801 
2802 		if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2803 			/*
2804 			 * We don't need to do the asconf thing, nor hb or
2805 			 * autoclose if the socket is closed.
2806 			 */
2807 			goto closed_socket;
2808 		}
2809 
2810 		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2811 		    stcb, net);
2812 
2813 		if (stcb->asoc.sctp_autoclose_ticks &&
2814 		    sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2815 			sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2816 			    stcb->sctp_ep, stcb, NULL);
2817 		}
2818 		/*
2819 		 * send ASCONF if parameters are pending and ASCONFs are
2820 		 * allowed (eg. addresses changed when init/cookie echo were
2821 		 * in flight)
2822 		 */
2823 		if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2824 		    (stcb->asoc.asconf_supported == 1) &&
2825 		    (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2826 #ifdef SCTP_TIMER_BASED_ASCONF
2827 			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2828 			    stcb->sctp_ep, stcb,
2829 			    stcb->asoc.primary_destination);
2830 #else
2831 			sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2832 			    SCTP_ADDR_NOT_LOCKED);
2833 #endif
2834 		}
2835 	}
2836 closed_socket:
2837 	/* Toss the cookie if I can */
2838 	sctp_toss_old_cookies(stcb, asoc);
2839 	/* Restart the timer if we have pending data */
2840 	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
2841 		if (chk->whoTo != NULL) {
2842 			break;
2843 		}
2844 	}
2845 	if (chk != NULL) {
2846 		sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2847 	}
2848 }
2849 
2850 static void
2851 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2852     struct sctp_tcb *stcb)
2853 {
2854 	struct sctp_nets *net;
2855 	struct sctp_tmit_chunk *lchk;
2856 	struct sctp_ecne_chunk bkup;
2857 	uint8_t override_bit;
2858 	uint32_t tsn, window_data_tsn;
2859 	int len;
2860 	unsigned int pkt_cnt;
2861 
2862 	len = ntohs(cp->ch.chunk_length);
2863 	if (len == sizeof(struct old_sctp_ecne_chunk)) {
2864 		/* Its the old format */
2865 		memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2866 		bkup.num_pkts_since_cwr = htonl(1);
2867 		cp = &bkup;
2868 	}
2869 	SCTP_STAT_INCR(sctps_recvecne);
2870 	tsn = ntohl(cp->tsn);
2871 	pkt_cnt = ntohl(cp->num_pkts_since_cwr);
2872 	lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
2873 	if (lchk == NULL) {
2874 		window_data_tsn = stcb->asoc.sending_seq - 1;
2875 	} else {
2876 		window_data_tsn = lchk->rec.data.tsn;
2877 	}
2878 
2879 	/* Find where it was sent to if possible. */
2880 	net = NULL;
2881 	TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
2882 		if (lchk->rec.data.tsn == tsn) {
2883 			net = lchk->whoTo;
2884 			net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
2885 			break;
2886 		}
2887 		if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
2888 			break;
2889 		}
2890 	}
2891 	if (net == NULL) {
2892 		/*
2893 		 * What to do. A previous send of a CWR was possibly lost.
2894 		 * See how old it is, we may have it marked on the actual
2895 		 * net.
2896 		 */
2897 		TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
2898 			if (tsn == net->last_cwr_tsn) {
2899 				/* Found him, send it off */
2900 				break;
2901 			}
2902 		}
2903 		if (net == NULL) {
2904 			/*
2905 			 * If we reach here, we need to send a special CWR
2906 			 * that says hey, we did this a long time ago and
2907 			 * you lost the response.
2908 			 */
2909 			net = TAILQ_FIRST(&stcb->asoc.nets);
2910 			if (net == NULL) {
2911 				/* TSNH */
2912 				return;
2913 			}
2914 			override_bit = SCTP_CWR_REDUCE_OVERRIDE;
2915 		} else {
2916 			override_bit = 0;
2917 		}
2918 	} else {
2919 		override_bit = 0;
2920 	}
2921 	if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
2922 	    ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2923 		/*
2924 		 * JRS - Use the congestion control given in the pluggable
2925 		 * CC module
2926 		 */
2927 		stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
2928 		/*
2929 		 * We reduce once every RTT. So we will only lower cwnd at
2930 		 * the next sending seq i.e. the window_data_tsn
2931 		 */
2932 		net->cwr_window_tsn = window_data_tsn;
2933 		net->ecn_ce_pkt_cnt += pkt_cnt;
2934 		net->lost_cnt = pkt_cnt;
2935 		net->last_cwr_tsn = tsn;
2936 	} else {
2937 		override_bit |= SCTP_CWR_IN_SAME_WINDOW;
2938 		if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
2939 		    ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
2940 			/*
2941 			 * Another loss in the same window update how many
2942 			 * marks/packets lost we have had.
2943 			 */
2944 			int cnt = 1;
2945 
2946 			if (pkt_cnt > net->lost_cnt) {
2947 				/* Should be the case */
2948 				cnt = (pkt_cnt - net->lost_cnt);
2949 				net->ecn_ce_pkt_cnt += cnt;
2950 			}
2951 			net->lost_cnt = pkt_cnt;
2952 			net->last_cwr_tsn = tsn;
2953 			/*
2954 			 * Most CC functions will ignore this call, since we
2955 			 * are in-window yet of the initial CE the peer saw.
2956 			 */
2957 			stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
2958 		}
2959 	}
2960 	/*
2961 	 * We always send a CWR this way if our previous one was lost our
2962 	 * peer will get an update, or if it is not time again to reduce we
2963 	 * still get the cwr to the peer. Note we set the override when we
2964 	 * could not find the TSN on the chunk or the destination network.
2965 	 */
2966 	sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
2967 }
2968 
2969 static void
2970 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
2971 {
2972 	/*
2973 	 * Here we get a CWR from the peer. We must look in the outqueue and
2974 	 * make sure that we have a covered ECNE in the control chunk part.
2975 	 * If so remove it.
2976 	 */
2977 	struct sctp_tmit_chunk *chk, *nchk;
2978 	struct sctp_ecne_chunk *ecne;
2979 	int override;
2980 	uint32_t cwr_tsn;
2981 
2982 	cwr_tsn = ntohl(cp->tsn);
2983 	override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
2984 	TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
2985 		if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
2986 			continue;
2987 		}
2988 		if ((override == 0) && (chk->whoTo != net)) {
2989 			/* Must be from the right src unless override is set */
2990 			continue;
2991 		}
2992 		ecne = mtod(chk->data, struct sctp_ecne_chunk *);
2993 		if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
2994 			/* this covers this ECNE, we can remove it */
2995 			stcb->asoc.ecn_echo_cnt_onq--;
2996 			TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
2997 			    sctp_next);
2998 			stcb->asoc.ctrl_queue_cnt--;
2999 			sctp_m_freem(chk->data);
3000 			chk->data = NULL;
3001 			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3002 			if (override == 0) {
3003 				break;
3004 			}
3005 		}
3006 	}
3007 }
3008 
3009 static void
3010 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3011     struct sctp_tcb *stcb, struct sctp_nets *net)
3012 {
3013 
3014 	SCTPDBG(SCTP_DEBUG_INPUT2,
3015 	    "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3016 	if (stcb == NULL)
3017 		return;
3018 
3019 	/* process according to association state */
3020 	if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3021 		/* unexpected SHUTDOWN-COMPLETE... so ignore... */
3022 		SCTPDBG(SCTP_DEBUG_INPUT2,
3023 		    "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3024 		SCTP_TCB_UNLOCK(stcb);
3025 		return;
3026 	}
3027 	/* notify upper layer protocol */
3028 	if (stcb->sctp_socket) {
3029 		sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3030 	}
3031 #ifdef INVARIANTS
3032 	if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3033 	    !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3034 	    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3035 		panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3036 	}
3037 #endif
3038 	/* stop the timer */
3039 	sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3040 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3041 	SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3042 	/* free the TCB */
3043 	SCTPDBG(SCTP_DEBUG_INPUT2,
3044 	    "sctp_handle_shutdown_complete: calls free-asoc\n");
3045 	(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3046 	    SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3047 	return;
3048 }
3049 
3050 static int
3051 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3052     struct sctp_nets *net, uint8_t flg)
3053 {
3054 	switch (desc->chunk_type) {
3055 	case SCTP_DATA:
3056 	case SCTP_IDATA:
3057 		/* find the tsn to resend (possibly) */
3058 		{
3059 			uint32_t tsn;
3060 			struct sctp_tmit_chunk *tp1;
3061 
3062 			tsn = ntohl(desc->tsn_ifany);
3063 			TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3064 				if (tp1->rec.data.tsn == tsn) {
3065 					/* found it */
3066 					break;
3067 				}
3068 				if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3069 					/* not found */
3070 					tp1 = NULL;
3071 					break;
3072 				}
3073 			}
3074 			if (tp1 == NULL) {
3075 				/*
3076 				 * Do it the other way , aka without paying
3077 				 * attention to queue seq order.
3078 				 */
3079 				SCTP_STAT_INCR(sctps_pdrpdnfnd);
3080 				TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3081 					if (tp1->rec.data.tsn == tsn) {
3082 						/* found it */
3083 						break;
3084 					}
3085 				}
3086 			}
3087 			if (tp1 == NULL) {
3088 				SCTP_STAT_INCR(sctps_pdrptsnnf);
3089 			}
3090 			if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3091 				if (((flg & SCTP_BADCRC) == 0) &&
3092 				    ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3093 					return (0);
3094 				}
3095 				if ((stcb->asoc.peers_rwnd == 0) &&
3096 				    ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3097 					SCTP_STAT_INCR(sctps_pdrpdiwnp);
3098 					return (0);
3099 				}
3100 				if (stcb->asoc.peers_rwnd == 0 &&
3101 				    (flg & SCTP_FROM_MIDDLE_BOX)) {
3102 					SCTP_STAT_INCR(sctps_pdrpdizrw);
3103 					return (0);
3104 				}
3105 				if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
3106 				    SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
3107 					/* Payload not matching. */
3108 					SCTP_STAT_INCR(sctps_pdrpbadd);
3109 					return (-1);
3110 				}
3111 				if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb),
3112 				    desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
3113 					/* Payload not matching. */
3114 					SCTP_STAT_INCR(sctps_pdrpbadd);
3115 					return (-1);
3116 				}
3117 				if (tp1->do_rtt) {
3118 					/*
3119 					 * this guy had a RTO calculation
3120 					 * pending on it, cancel it
3121 					 */
3122 					if (tp1->whoTo->rto_needed == 0) {
3123 						tp1->whoTo->rto_needed = 1;
3124 					}
3125 					tp1->do_rtt = 0;
3126 				}
3127 				SCTP_STAT_INCR(sctps_pdrpmark);
3128 				if (tp1->sent != SCTP_DATAGRAM_RESEND)
3129 					sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3130 				/*
3131 				 * mark it as if we were doing a FR, since
3132 				 * we will be getting gap ack reports behind
3133 				 * the info from the router.
3134 				 */
3135 				tp1->rec.data.doing_fast_retransmit = 1;
3136 				/*
3137 				 * mark the tsn with what sequences can
3138 				 * cause a new FR.
3139 				 */
3140 				if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3141 					tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3142 				} else {
3143 					tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3144 				}
3145 
3146 				/* restart the timer */
3147 				sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3148 				    stcb, tp1->whoTo,
3149 				    SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3150 				sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3151 				    stcb, tp1->whoTo);
3152 
3153 				/* fix counts and things */
3154 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3155 					sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3156 					    tp1->whoTo->flight_size,
3157 					    tp1->book_size,
3158 					    (uint32_t)(uintptr_t)stcb,
3159 					    tp1->rec.data.tsn);
3160 				}
3161 				if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3162 					sctp_flight_size_decrease(tp1);
3163 					sctp_total_flight_decrease(stcb, tp1);
3164 				}
3165 				tp1->sent = SCTP_DATAGRAM_RESEND;
3166 			} {
3167 				/* audit code */
3168 				unsigned int audit;
3169 
3170 				audit = 0;
3171 				TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3172 					if (tp1->sent == SCTP_DATAGRAM_RESEND)
3173 						audit++;
3174 				}
3175 				TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3176 				    sctp_next) {
3177 					if (tp1->sent == SCTP_DATAGRAM_RESEND)
3178 						audit++;
3179 				}
3180 				if (audit != stcb->asoc.sent_queue_retran_cnt) {
3181 					SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3182 					    audit, stcb->asoc.sent_queue_retran_cnt);
3183 #ifndef SCTP_AUDITING_ENABLED
3184 					stcb->asoc.sent_queue_retran_cnt = audit;
3185 #endif
3186 				}
3187 			}
3188 		}
3189 		break;
3190 	case SCTP_ASCONF:
3191 		{
3192 			struct sctp_tmit_chunk *asconf;
3193 
3194 			TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3195 			    sctp_next) {
3196 				if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3197 					break;
3198 				}
3199 			}
3200 			if (asconf) {
3201 				if (asconf->sent != SCTP_DATAGRAM_RESEND)
3202 					sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3203 				asconf->sent = SCTP_DATAGRAM_RESEND;
3204 				asconf->snd_count--;
3205 			}
3206 		}
3207 		break;
3208 	case SCTP_INITIATION:
3209 		/* resend the INIT */
3210 		stcb->asoc.dropped_special_cnt++;
3211 		if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3212 			/*
3213 			 * If we can get it in, in a few attempts we do
3214 			 * this, otherwise we let the timer fire.
3215 			 */
3216 			sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3217 			    stcb, net,
3218 			    SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3219 			sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3220 		}
3221 		break;
3222 	case SCTP_SELECTIVE_ACK:
3223 	case SCTP_NR_SELECTIVE_ACK:
3224 		/* resend the sack */
3225 		sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3226 		break;
3227 	case SCTP_HEARTBEAT_REQUEST:
3228 		/* resend a demand HB */
3229 		if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3230 			/*
3231 			 * Only retransmit if we KNOW we wont destroy the
3232 			 * tcb
3233 			 */
3234 			sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3235 		}
3236 		break;
3237 	case SCTP_SHUTDOWN:
3238 		sctp_send_shutdown(stcb, net);
3239 		break;
3240 	case SCTP_SHUTDOWN_ACK:
3241 		sctp_send_shutdown_ack(stcb, net);
3242 		break;
3243 	case SCTP_COOKIE_ECHO:
3244 		{
3245 			struct sctp_tmit_chunk *cookie;
3246 
3247 			cookie = NULL;
3248 			TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3249 			    sctp_next) {
3250 				if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3251 					break;
3252 				}
3253 			}
3254 			if (cookie) {
3255 				if (cookie->sent != SCTP_DATAGRAM_RESEND)
3256 					sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3257 				cookie->sent = SCTP_DATAGRAM_RESEND;
3258 				sctp_stop_all_cookie_timers(stcb);
3259 			}
3260 		}
3261 		break;
3262 	case SCTP_COOKIE_ACK:
3263 		sctp_send_cookie_ack(stcb);
3264 		break;
3265 	case SCTP_ASCONF_ACK:
3266 		/* resend last asconf ack */
3267 		sctp_send_asconf_ack(stcb);
3268 		break;
3269 	case SCTP_IFORWARD_CUM_TSN:
3270 	case SCTP_FORWARD_CUM_TSN:
3271 		send_forward_tsn(stcb, &stcb->asoc);
3272 		break;
3273 		/* can't do anything with these */
3274 	case SCTP_PACKET_DROPPED:
3275 	case SCTP_INITIATION_ACK:	/* this should not happen */
3276 	case SCTP_HEARTBEAT_ACK:
3277 	case SCTP_ABORT_ASSOCIATION:
3278 	case SCTP_OPERATION_ERROR:
3279 	case SCTP_SHUTDOWN_COMPLETE:
3280 	case SCTP_ECN_ECHO:
3281 	case SCTP_ECN_CWR:
3282 	default:
3283 		break;
3284 	}
3285 	return (0);
3286 }
3287 
3288 void
3289 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3290 {
3291 	uint32_t i;
3292 	uint16_t temp;
3293 
3294 	/*
3295 	 * We set things to 0xffffffff since this is the last delivered
3296 	 * sequence and we will be sending in 0 after the reset.
3297 	 */
3298 
3299 	if (number_entries) {
3300 		for (i = 0; i < number_entries; i++) {
3301 			temp = ntohs(list[i]);
3302 			if (temp >= stcb->asoc.streamincnt) {
3303 				continue;
3304 			}
3305 			stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3306 		}
3307 	} else {
3308 		list = NULL;
3309 		for (i = 0; i < stcb->asoc.streamincnt; i++) {
3310 			stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3311 		}
3312 	}
3313 	sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3314 }
3315 
3316 static void
3317 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3318 {
3319 	uint32_t i;
3320 	uint16_t temp;
3321 
3322 	if (number_entries > 0) {
3323 		for (i = 0; i < number_entries; i++) {
3324 			temp = ntohs(list[i]);
3325 			if (temp >= stcb->asoc.streamoutcnt) {
3326 				/* no such stream */
3327 				continue;
3328 			}
3329 			stcb->asoc.strmout[temp].next_mid_ordered = 0;
3330 			stcb->asoc.strmout[temp].next_mid_unordered = 0;
3331 		}
3332 	} else {
3333 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3334 			stcb->asoc.strmout[i].next_mid_ordered = 0;
3335 			stcb->asoc.strmout[i].next_mid_unordered = 0;
3336 		}
3337 	}
3338 	sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3339 }
3340 
3341 static void
3342 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3343 {
3344 	uint32_t i;
3345 	uint16_t temp;
3346 
3347 	if (number_entries > 0) {
3348 		for (i = 0; i < number_entries; i++) {
3349 			temp = ntohs(list[i]);
3350 			if (temp >= stcb->asoc.streamoutcnt) {
3351 				/* no such stream */
3352 				continue;
3353 			}
3354 			stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3355 		}
3356 	} else {
3357 		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3358 			stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3359 		}
3360 	}
3361 }
3362 
3363 struct sctp_stream_reset_request *
3364 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3365 {
3366 	struct sctp_association *asoc;
3367 	struct sctp_chunkhdr *ch;
3368 	struct sctp_stream_reset_request *r;
3369 	struct sctp_tmit_chunk *chk;
3370 	int len, clen;
3371 
3372 	asoc = &stcb->asoc;
3373 	chk = asoc->str_reset;
3374 	if (TAILQ_EMPTY(&asoc->control_send_queue) ||
3375 	    (chk == NULL)) {
3376 		asoc->stream_reset_outstanding = 0;
3377 		return (NULL);
3378 	}
3379 	if (chk->data == NULL) {
3380 		return (NULL);
3381 	}
3382 	if (bchk != NULL) {
3383 		/* he wants a copy of the chk pointer */
3384 		*bchk = chk;
3385 	}
3386 	clen = chk->send_size;
3387 	ch = mtod(chk->data, struct sctp_chunkhdr *);
3388 	r = (struct sctp_stream_reset_request *)(ch + 1);
3389 	if (ntohl(r->request_seq) == seq) {
3390 		/* found it */
3391 		return (r);
3392 	}
3393 	len = SCTP_SIZE32(ntohs(r->ph.param_length));
3394 	if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3395 		/* move to the next one, there can only be a max of two */
3396 		r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3397 		if (ntohl(r->request_seq) == seq) {
3398 			return (r);
3399 		}
3400 	}
3401 	/* that seq is not here */
3402 	return (NULL);
3403 }
3404 
3405 static void
3406 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3407 {
3408 	struct sctp_association *asoc;
3409 	struct sctp_tmit_chunk *chk;
3410 
3411 	asoc = &stcb->asoc;
3412 	chk = asoc->str_reset;
3413 	if (chk == NULL) {
3414 		return;
3415 	}
3416 	asoc->str_reset = NULL;
3417 	sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3418 	    NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3419 	TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3420 	asoc->ctrl_queue_cnt--;
3421 	if (chk->data) {
3422 		sctp_m_freem(chk->data);
3423 		chk->data = NULL;
3424 	}
3425 	sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3426 }
3427 
3428 static int
3429 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3430     uint32_t seq, uint32_t action,
3431     struct sctp_stream_reset_response *respin)
3432 {
3433 	uint16_t type;
3434 	int lparam_len;
3435 	struct sctp_association *asoc = &stcb->asoc;
3436 	struct sctp_tmit_chunk *chk;
3437 	struct sctp_stream_reset_request *req_param;
3438 	struct sctp_stream_reset_out_request *req_out_param;
3439 	struct sctp_stream_reset_in_request *req_in_param;
3440 	uint32_t number_entries;
3441 
3442 	if (asoc->stream_reset_outstanding == 0) {
3443 		/* duplicate */
3444 		return (0);
3445 	}
3446 	if (seq == stcb->asoc.str_reset_seq_out) {
3447 		req_param = sctp_find_stream_reset(stcb, seq, &chk);
3448 		if (req_param != NULL) {
3449 			stcb->asoc.str_reset_seq_out++;
3450 			type = ntohs(req_param->ph.param_type);
3451 			lparam_len = ntohs(req_param->ph.param_length);
3452 			if (type == SCTP_STR_RESET_OUT_REQUEST) {
3453 				int no_clear = 0;
3454 
3455 				req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3456 				number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3457 				asoc->stream_reset_out_is_outstanding = 0;
3458 				if (asoc->stream_reset_outstanding)
3459 					asoc->stream_reset_outstanding--;
3460 				if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3461 					/* do it */
3462 					sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3463 				} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3464 					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3465 				} else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3466 					/*
3467 					 * Set it up so we don't stop
3468 					 * retransmitting
3469 					 */
3470 					asoc->stream_reset_outstanding++;
3471 					stcb->asoc.str_reset_seq_out--;
3472 					asoc->stream_reset_out_is_outstanding = 1;
3473 					no_clear = 1;
3474 				} else {
3475 					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3476 				}
3477 				if (no_clear == 0) {
3478 					sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3479 				}
3480 			} else if (type == SCTP_STR_RESET_IN_REQUEST) {
3481 				req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3482 				number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3483 				if (asoc->stream_reset_outstanding)
3484 					asoc->stream_reset_outstanding--;
3485 				if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3486 					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3487 					    number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3488 				} else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3489 					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3490 					    number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3491 				}
3492 			} else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3493 				/* Ok we now may have more streams */
3494 				int num_stream;
3495 
3496 				num_stream = stcb->asoc.strm_pending_add_size;
3497 				if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3498 					/* TSNH */
3499 					num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3500 				}
3501 				stcb->asoc.strm_pending_add_size = 0;
3502 				if (asoc->stream_reset_outstanding)
3503 					asoc->stream_reset_outstanding--;
3504 				if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3505 					/* Put the new streams into effect */
3506 					int i;
3507 
3508 					for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3509 						asoc->strmout[i].state = SCTP_STREAM_OPEN;
3510 					}
3511 					asoc->streamoutcnt += num_stream;
3512 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3513 				} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3514 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3515 					    SCTP_STREAM_CHANGE_DENIED);
3516 				} else {
3517 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3518 					    SCTP_STREAM_CHANGE_FAILED);
3519 				}
3520 			} else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3521 				if (asoc->stream_reset_outstanding)
3522 					asoc->stream_reset_outstanding--;
3523 				if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3524 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3525 					    SCTP_STREAM_CHANGE_DENIED);
3526 				} else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3527 					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3528 					    SCTP_STREAM_CHANGE_FAILED);
3529 				}
3530 			} else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3531 				/**
3532 				 * a) Adopt the new in tsn.
3533 				 * b) reset the map
3534 				 * c) Adopt the new out-tsn
3535 				 */
3536 				struct sctp_stream_reset_response_tsn *resp;
3537 				struct sctp_forward_tsn_chunk fwdtsn;
3538 				int abort_flag = 0;
3539 
3540 				if (respin == NULL) {
3541 					/* huh ? */
3542 					return (0);
3543 				}
3544 				if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3545 					return (0);
3546 				}
3547 				if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3548 					resp = (struct sctp_stream_reset_response_tsn *)respin;
3549 					asoc->stream_reset_outstanding--;
3550 					fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3551 					fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3552 					fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3553 					sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3554 					if (abort_flag) {
3555 						return (1);
3556 					}
3557 					stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3558 					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3559 						sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3560 					}
3561 
3562 					stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3563 					stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3564 					memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3565 
3566 					stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3567 					memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3568 
3569 					stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3570 					stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3571 
3572 					sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3573 					sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3574 					sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3575 				} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3576 					sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3577 					    SCTP_ASSOC_RESET_DENIED);
3578 				} else {
3579 					sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3580 					    SCTP_ASSOC_RESET_FAILED);
3581 				}
3582 			}
3583 			/* get rid of the request and get the request flags */
3584 			if (asoc->stream_reset_outstanding == 0) {
3585 				sctp_clean_up_stream_reset(stcb);
3586 			}
3587 		}
3588 	}
3589 	if (asoc->stream_reset_outstanding == 0) {
3590 		sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3591 	}
3592 	return (0);
3593 }
3594 
3595 static void
3596 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3597     struct sctp_tmit_chunk *chk,
3598     struct sctp_stream_reset_in_request *req, int trunc)
3599 {
3600 	uint32_t seq;
3601 	int len, i;
3602 	int number_entries;
3603 	uint16_t temp;
3604 
3605 	/*
3606 	 * peer wants me to send a str-reset to him for my outgoing seq's if
3607 	 * seq_in is right.
3608 	 */
3609 	struct sctp_association *asoc = &stcb->asoc;
3610 
3611 	seq = ntohl(req->request_seq);
3612 	if (asoc->str_reset_seq_in == seq) {
3613 		asoc->last_reset_action[1] = asoc->last_reset_action[0];
3614 		if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3615 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3616 		} else if (trunc) {
3617 			/* Can't do it, since they exceeded our buffer size  */
3618 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3619 		} else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3620 			len = ntohs(req->ph.param_length);
3621 			number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3622 			if (number_entries) {
3623 				for (i = 0; i < number_entries; i++) {
3624 					temp = ntohs(req->list_of_streams[i]);
3625 					if (temp >= stcb->asoc.streamoutcnt) {
3626 						asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3627 						goto bad_boy;
3628 					}
3629 					req->list_of_streams[i] = temp;
3630 				}
3631 				for (i = 0; i < number_entries; i++) {
3632 					if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3633 						stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3634 					}
3635 				}
3636 			} else {
3637 				/* Its all */
3638 				for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3639 					if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3640 						stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3641 				}
3642 			}
3643 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3644 		} else {
3645 			/* Can't do it, since we have sent one out */
3646 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3647 		}
3648 bad_boy:
3649 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3650 		asoc->str_reset_seq_in++;
3651 	} else if (asoc->str_reset_seq_in - 1 == seq) {
3652 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3653 	} else if (asoc->str_reset_seq_in - 2 == seq) {
3654 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3655 	} else {
3656 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3657 	}
3658 	sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3659 }
3660 
3661 static int
3662 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3663     struct sctp_tmit_chunk *chk,
3664     struct sctp_stream_reset_tsn_request *req)
3665 {
3666 	/* reset all in and out and update the tsn */
3667 	/*
3668 	 * A) reset my str-seq's on in and out. B) Select a receive next,
3669 	 * and set cum-ack to it. Also process this selected number as a
3670 	 * fwd-tsn as well. C) set in the response my next sending seq.
3671 	 */
3672 	struct sctp_forward_tsn_chunk fwdtsn;
3673 	struct sctp_association *asoc = &stcb->asoc;
3674 	int abort_flag = 0;
3675 	uint32_t seq;
3676 
3677 	seq = ntohl(req->request_seq);
3678 	if (asoc->str_reset_seq_in == seq) {
3679 		asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3680 		if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3681 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3682 		} else {
3683 			fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3684 			fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3685 			fwdtsn.ch.chunk_flags = 0;
3686 			fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3687 			sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3688 			if (abort_flag) {
3689 				return (1);
3690 			}
3691 			asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3692 			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3693 				sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3694 			}
3695 			asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3696 			asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3697 			memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3698 			asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3699 			memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3700 			atomic_add_int(&asoc->sending_seq, 1);
3701 			/* save off historical data for retrans */
3702 			asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3703 			asoc->last_sending_seq[0] = asoc->sending_seq;
3704 			asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3705 			asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3706 			sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3707 			sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3708 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3709 			sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3710 		}
3711 		sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3712 		    asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3713 		asoc->str_reset_seq_in++;
3714 	} else if (asoc->str_reset_seq_in - 1 == seq) {
3715 		sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3716 		    asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3717 	} else if (asoc->str_reset_seq_in - 2 == seq) {
3718 		sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3719 		    asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3720 	} else {
3721 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3722 	}
3723 	return (0);
3724 }
3725 
3726 static void
3727 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3728     struct sctp_tmit_chunk *chk,
3729     struct sctp_stream_reset_out_request *req, int trunc)
3730 {
3731 	uint32_t seq, tsn;
3732 	int number_entries, len;
3733 	struct sctp_association *asoc = &stcb->asoc;
3734 
3735 	seq = ntohl(req->request_seq);
3736 
3737 	/* now if its not a duplicate we process it */
3738 	if (asoc->str_reset_seq_in == seq) {
3739 		len = ntohs(req->ph.param_length);
3740 		number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3741 		/*
3742 		 * the sender is resetting, handle the list issue.. we must
3743 		 * a) verify if we can do the reset, if so no problem b) If
3744 		 * we can't do the reset we must copy the request. c) queue
3745 		 * it, and setup the data in processor to trigger it off
3746 		 * when needed and dequeue all the queued data.
3747 		 */
3748 		tsn = ntohl(req->send_reset_at_tsn);
3749 
3750 		/* move the reset action back one */
3751 		asoc->last_reset_action[1] = asoc->last_reset_action[0];
3752 		if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3753 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3754 		} else if (trunc) {
3755 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3756 		} else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3757 			/* we can do it now */
3758 			sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3759 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3760 		} else {
3761 			/*
3762 			 * we must queue it up and thus wait for the TSN's
3763 			 * to arrive that are at or before tsn
3764 			 */
3765 			struct sctp_stream_reset_list *liste;
3766 			int siz;
3767 
3768 			siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3769 			SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3770 			    siz, SCTP_M_STRESET);
3771 			if (liste == NULL) {
3772 				/* gak out of memory */
3773 				asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3774 				sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3775 				return;
3776 			}
3777 			liste->seq = seq;
3778 			liste->tsn = tsn;
3779 			liste->number_entries = number_entries;
3780 			memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3781 			TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3782 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3783 		}
3784 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3785 		asoc->str_reset_seq_in++;
3786 	} else if ((asoc->str_reset_seq_in - 1) == seq) {
3787 		/*
3788 		 * one seq back, just echo back last action since my
3789 		 * response was lost.
3790 		 */
3791 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3792 	} else if ((asoc->str_reset_seq_in - 2) == seq) {
3793 		/*
3794 		 * two seq back, just echo back last action since my
3795 		 * response was lost.
3796 		 */
3797 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3798 	} else {
3799 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3800 	}
3801 }
3802 
3803 static void
3804 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3805     struct sctp_stream_reset_add_strm *str_add)
3806 {
3807 	/*
3808 	 * Peer is requesting to add more streams. If its within our
3809 	 * max-streams we will allow it.
3810 	 */
3811 	uint32_t num_stream, i;
3812 	uint32_t seq;
3813 	struct sctp_association *asoc = &stcb->asoc;
3814 	struct sctp_queued_to_read *ctl, *nctl;
3815 
3816 	/* Get the number. */
3817 	seq = ntohl(str_add->request_seq);
3818 	num_stream = ntohs(str_add->number_of_streams);
3819 	/* Now what would be the new total? */
3820 	if (asoc->str_reset_seq_in == seq) {
3821 		num_stream += stcb->asoc.streamincnt;
3822 		stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3823 		if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3824 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3825 		} else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3826 		    (num_stream > 0xffff)) {
3827 			/* We must reject it they ask for to many */
3828 	denied:
3829 			stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3830 		} else {
3831 			/* Ok, we can do that :-) */
3832 			struct sctp_stream_in *oldstrm;
3833 
3834 			/* save off the old */
3835 			oldstrm = stcb->asoc.strmin;
3836 			SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3837 			    (num_stream * sizeof(struct sctp_stream_in)),
3838 			    SCTP_M_STRMI);
3839 			if (stcb->asoc.strmin == NULL) {
3840 				stcb->asoc.strmin = oldstrm;
3841 				goto denied;
3842 			}
3843 			/* copy off the old data */
3844 			for (i = 0; i < stcb->asoc.streamincnt; i++) {
3845 				TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3846 				TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3847 				stcb->asoc.strmin[i].sid = i;
3848 				stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
3849 				stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3850 				stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
3851 				/* now anything on those queues? */
3852 				TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
3853 					TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
3854 					TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
3855 				}
3856 				TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
3857 					TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
3858 					TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
3859 				}
3860 			}
3861 			/* Init the new streams */
3862 			for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3863 				TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3864 				TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
3865 				stcb->asoc.strmin[i].sid = i;
3866 				stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3867 				stcb->asoc.strmin[i].pd_api_started = 0;
3868 				stcb->asoc.strmin[i].delivery_started = 0;
3869 			}
3870 			SCTP_FREE(oldstrm, SCTP_M_STRMI);
3871 			/* update the size */
3872 			stcb->asoc.streamincnt = num_stream;
3873 			stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3874 			sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3875 		}
3876 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3877 		asoc->str_reset_seq_in++;
3878 	} else if ((asoc->str_reset_seq_in - 1) == seq) {
3879 		/*
3880 		 * one seq back, just echo back last action since my
3881 		 * response was lost.
3882 		 */
3883 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3884 	} else if ((asoc->str_reset_seq_in - 2) == seq) {
3885 		/*
3886 		 * two seq back, just echo back last action since my
3887 		 * response was lost.
3888 		 */
3889 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3890 	} else {
3891 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3892 	}
3893 }
3894 
3895 static void
3896 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3897     struct sctp_stream_reset_add_strm *str_add)
3898 {
3899 	/*
3900 	 * Peer is requesting to add more streams. If its within our
3901 	 * max-streams we will allow it.
3902 	 */
3903 	uint16_t num_stream;
3904 	uint32_t seq;
3905 	struct sctp_association *asoc = &stcb->asoc;
3906 
3907 	/* Get the number. */
3908 	seq = ntohl(str_add->request_seq);
3909 	num_stream = ntohs(str_add->number_of_streams);
3910 	/* Now what would be the new total? */
3911 	if (asoc->str_reset_seq_in == seq) {
3912 		stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3913 		if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3914 			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3915 		} else if (stcb->asoc.stream_reset_outstanding) {
3916 			/* We must reject it we have something pending */
3917 			stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3918 		} else {
3919 			/* Ok, we can do that :-) */
3920 			int mychk;
3921 
3922 			mychk = stcb->asoc.streamoutcnt;
3923 			mychk += num_stream;
3924 			if (mychk < 0x10000) {
3925 				stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3926 				if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
3927 					stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3928 				}
3929 			} else {
3930 				stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3931 			}
3932 		}
3933 		sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
3934 		asoc->str_reset_seq_in++;
3935 	} else if ((asoc->str_reset_seq_in - 1) == seq) {
3936 		/*
3937 		 * one seq back, just echo back last action since my
3938 		 * response was lost.
3939 		 */
3940 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3941 	} else if ((asoc->str_reset_seq_in - 2) == seq) {
3942 		/*
3943 		 * two seq back, just echo back last action since my
3944 		 * response was lost.
3945 		 */
3946 		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3947 	} else {
3948 		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3949 	}
3950 }
3951 
3952 #ifdef __GNUC__
3953 __attribute__((noinline))
3954 #endif
3955 static int
3956 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
3957     struct sctp_chunkhdr *ch_req)
3958 {
3959 	uint16_t remaining_length, param_len, ptype;
3960 	struct sctp_paramhdr pstore;
3961 	uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
3962 	uint32_t seq = 0;
3963 	int num_req = 0;
3964 	int trunc = 0;
3965 	struct sctp_tmit_chunk *chk;
3966 	struct sctp_chunkhdr *ch;
3967 	struct sctp_paramhdr *ph;
3968 	int ret_code = 0;
3969 	int num_param = 0;
3970 
3971 	/* now it may be a reset or a reset-response */
3972 	remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
3973 
3974 	/* setup for adding the response */
3975 	sctp_alloc_a_chunk(stcb, chk);
3976 	if (chk == NULL) {
3977 		return (ret_code);
3978 	}
3979 	chk->copy_by_ref = 0;
3980 	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
3981 	chk->rec.chunk_id.can_take_data = 0;
3982 	chk->flags = 0;
3983 	chk->asoc = &stcb->asoc;
3984 	chk->no_fr_allowed = 0;
3985 	chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
3986 	chk->book_size_scale = 0;
3987 	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
3988 	if (chk->data == NULL) {
3989 strres_nochunk:
3990 		if (chk->data) {
3991 			sctp_m_freem(chk->data);
3992 			chk->data = NULL;
3993 		}
3994 		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3995 		return (ret_code);
3996 	}
3997 	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
3998 
3999 	/* setup chunk parameters */
4000 	chk->sent = SCTP_DATAGRAM_UNSENT;
4001 	chk->snd_count = 0;
4002 	chk->whoTo = NULL;
4003 
4004 	ch = mtod(chk->data, struct sctp_chunkhdr *);
4005 	ch->chunk_type = SCTP_STREAM_RESET;
4006 	ch->chunk_flags = 0;
4007 	ch->chunk_length = htons(chk->send_size);
4008 	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4009 	offset += sizeof(struct sctp_chunkhdr);
4010 	while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4011 		ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4012 		if (ph == NULL) {
4013 			/* TSNH */
4014 			break;
4015 		}
4016 		param_len = ntohs(ph->param_length);
4017 		if ((param_len > remaining_length) ||
4018 		    (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4019 			/* bad parameter length */
4020 			break;
4021 		}
4022 		ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4023 		    (uint8_t *)&cstore);
4024 		if (ph == NULL) {
4025 			/* TSNH */
4026 			break;
4027 		}
4028 		ptype = ntohs(ph->param_type);
4029 		num_param++;
4030 		if (param_len > sizeof(cstore)) {
4031 			trunc = 1;
4032 		} else {
4033 			trunc = 0;
4034 		}
4035 		if (num_param > SCTP_MAX_RESET_PARAMS) {
4036 			/* hit the max of parameters already sorry.. */
4037 			break;
4038 		}
4039 		if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4040 			struct sctp_stream_reset_out_request *req_out;
4041 
4042 			if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4043 				break;
4044 			}
4045 			req_out = (struct sctp_stream_reset_out_request *)ph;
4046 			num_req++;
4047 			if (stcb->asoc.stream_reset_outstanding) {
4048 				seq = ntohl(req_out->response_seq);
4049 				if (seq == stcb->asoc.str_reset_seq_out) {
4050 					/* implicit ack */
4051 					(void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4052 				}
4053 			}
4054 			sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4055 		} else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4056 			struct sctp_stream_reset_add_strm *str_add;
4057 
4058 			if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4059 				break;
4060 			}
4061 			str_add = (struct sctp_stream_reset_add_strm *)ph;
4062 			num_req++;
4063 			sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4064 		} else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4065 			struct sctp_stream_reset_add_strm *str_add;
4066 
4067 			if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4068 				break;
4069 			}
4070 			str_add = (struct sctp_stream_reset_add_strm *)ph;
4071 			num_req++;
4072 			sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4073 		} else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4074 			struct sctp_stream_reset_in_request *req_in;
4075 
4076 			num_req++;
4077 			req_in = (struct sctp_stream_reset_in_request *)ph;
4078 			sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4079 		} else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4080 			struct sctp_stream_reset_tsn_request *req_tsn;
4081 
4082 			num_req++;
4083 			req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4084 			if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4085 				ret_code = 1;
4086 				goto strres_nochunk;
4087 			}
4088 			/* no more */
4089 			break;
4090 		} else if (ptype == SCTP_STR_RESET_RESPONSE) {
4091 			struct sctp_stream_reset_response *resp;
4092 			uint32_t result;
4093 
4094 			if (param_len < sizeof(struct sctp_stream_reset_response)) {
4095 				break;
4096 			}
4097 			resp = (struct sctp_stream_reset_response *)ph;
4098 			seq = ntohl(resp->response_seq);
4099 			result = ntohl(resp->result);
4100 			if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4101 				ret_code = 1;
4102 				goto strres_nochunk;
4103 			}
4104 		} else {
4105 			break;
4106 		}
4107 		offset += SCTP_SIZE32(param_len);
4108 		if (remaining_length >= SCTP_SIZE32(param_len)) {
4109 			remaining_length -= SCTP_SIZE32(param_len);
4110 		} else {
4111 			remaining_length = 0;
4112 		}
4113 	}
4114 	if (num_req == 0) {
4115 		/* we have no response free the stuff */
4116 		goto strres_nochunk;
4117 	}
4118 	/* ok we have a chunk to link in */
4119 	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4120 	    chk,
4121 	    sctp_next);
4122 	stcb->asoc.ctrl_queue_cnt++;
4123 	return (ret_code);
4124 }
4125 
4126 /*
4127  * Handle a router or endpoints report of a packet loss, there are two ways
4128  * to handle this, either we get the whole packet and must disect it
4129  * ourselves (possibly with truncation and or corruption) or it is a summary
4130  * from a middle box that did the disectting for us.
4131  */
4132 static void
4133 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4134     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4135 {
4136 	struct sctp_chunk_desc desc;
4137 	struct sctp_chunkhdr *chk_hdr;
4138 	struct sctp_data_chunk *data_chunk;
4139 	struct sctp_idata_chunk *idata_chunk;
4140 	uint32_t bottle_bw, on_queue;
4141 	uint32_t offset, chk_len;
4142 	uint16_t pktdrp_len;
4143 	uint8_t pktdrp_flags;
4144 
4145 	KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
4146 	    ("PKTDROP chunk too small"));
4147 	pktdrp_flags = cp->ch.chunk_flags;
4148 	pktdrp_len = ntohs(cp->ch.chunk_length);
4149 	KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
4150 	if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
4151 		if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
4152 			/* The peer plays games with us. */
4153 			return;
4154 		}
4155 	}
4156 	limit -= sizeof(struct sctp_pktdrop_chunk);
4157 	offset = 0;
4158 	if (offset == limit) {
4159 		if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4160 			SCTP_STAT_INCR(sctps_pdrpbwrpt);
4161 		}
4162 	} else if (offset + sizeof(struct sctphdr) > limit) {
4163 		/* Only a partial SCTP common header. */
4164 		SCTP_STAT_INCR(sctps_pdrpcrupt);
4165 		offset = limit;
4166 	} else {
4167 		/* XXX: Check embedded SCTP common header. */
4168 		offset += sizeof(struct sctphdr);
4169 	}
4170 	/* Now parse through the chunks themselves. */
4171 	while (offset < limit) {
4172 		if (offset + sizeof(struct sctp_chunkhdr) > limit) {
4173 			SCTP_STAT_INCR(sctps_pdrpcrupt);
4174 			break;
4175 		}
4176 		chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
4177 		desc.chunk_type = chk_hdr->chunk_type;
4178 		/* get amount we need to move */
4179 		chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
4180 		if (chk_len < sizeof(struct sctp_chunkhdr)) {
4181 			/* Someone is lying... */
4182 			break;
4183 		}
4184 		if (desc.chunk_type == SCTP_DATA) {
4185 			if (stcb->asoc.idata_supported) {
4186 				/* Some is playing games with us. */
4187 				break;
4188 			}
4189 			if (chk_len <= sizeof(struct sctp_data_chunk)) {
4190 				/* Some is playing games with us. */
4191 				break;
4192 			}
4193 			if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4194 				/*
4195 				 * Not enough data bytes available in the
4196 				 * chunk.
4197 				 */
4198 				SCTP_STAT_INCR(sctps_pdrpnedat);
4199 				goto next_chunk;
4200 			}
4201 			if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4202 				/* Not enough data in buffer. */
4203 				break;
4204 			}
4205 			data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
4206 			memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4207 			desc.tsn_ifany = data_chunk->dp.tsn;
4208 			if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4209 				SCTP_STAT_INCR(sctps_pdrpmbda);
4210 			}
4211 		} else if (desc.chunk_type == SCTP_IDATA) {
4212 			if (!stcb->asoc.idata_supported) {
4213 				/* Some is playing games with us. */
4214 				break;
4215 			}
4216 			if (chk_len <= sizeof(struct sctp_idata_chunk)) {
4217 				/* Some is playing games with us. */
4218 				break;
4219 			}
4220 			if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4221 				/*
4222 				 * Not enough data bytes available in the
4223 				 * chunk.
4224 				 */
4225 				SCTP_STAT_INCR(sctps_pdrpnedat);
4226 				goto next_chunk;
4227 			}
4228 			if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4229 				/* Not enough data in buffer. */
4230 				break;
4231 			}
4232 			idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
4233 			memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4234 			desc.tsn_ifany = idata_chunk->dp.tsn;
4235 			if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4236 				SCTP_STAT_INCR(sctps_pdrpmbda);
4237 			}
4238 		} else {
4239 			if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4240 				SCTP_STAT_INCR(sctps_pdrpmbct);
4241 			}
4242 		}
4243 		if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
4244 			SCTP_STAT_INCR(sctps_pdrppdbrk);
4245 			break;
4246 		}
4247 next_chunk:
4248 		offset += SCTP_SIZE32(chk_len);
4249 	}
4250 	/* Now update any rwnd --- possibly */
4251 	if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4252 		/* From a peer, we get a rwnd report */
4253 		uint32_t a_rwnd;
4254 
4255 		SCTP_STAT_INCR(sctps_pdrpfehos);
4256 
4257 		bottle_bw = ntohl(cp->bottle_bw);
4258 		on_queue = ntohl(cp->current_onq);
4259 		if (bottle_bw && on_queue) {
4260 			/* a rwnd report is in here */
4261 			if (bottle_bw > on_queue)
4262 				a_rwnd = bottle_bw - on_queue;
4263 			else
4264 				a_rwnd = 0;
4265 
4266 			if (a_rwnd == 0)
4267 				stcb->asoc.peers_rwnd = 0;
4268 			else {
4269 				if (a_rwnd > stcb->asoc.total_flight) {
4270 					stcb->asoc.peers_rwnd =
4271 					    a_rwnd - stcb->asoc.total_flight;
4272 				} else {
4273 					stcb->asoc.peers_rwnd = 0;
4274 				}
4275 				if (stcb->asoc.peers_rwnd <
4276 				    stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4277 					/* SWS sender side engages */
4278 					stcb->asoc.peers_rwnd = 0;
4279 				}
4280 			}
4281 		}
4282 	} else {
4283 		SCTP_STAT_INCR(sctps_pdrpfmbox);
4284 	}
4285 
4286 	/* now middle boxes in sat networks get a cwnd bump */
4287 	if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
4288 	    (stcb->asoc.sat_t3_loss_recovery == 0) &&
4289 	    (stcb->asoc.sat_network)) {
4290 		/*
4291 		 * This is debatable but for sat networks it makes sense
4292 		 * Note if a T3 timer has went off, we will prohibit any
4293 		 * changes to cwnd until we exit the t3 loss recovery.
4294 		 */
4295 		stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4296 		    net, cp, &bottle_bw, &on_queue);
4297 	}
4298 }
4299 
4300 /*
4301  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4302  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4303  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4304  * length of the complete packet outputs: - length: modified to remaining
4305  * length after control processing - netp: modified to new sctp_nets after
4306  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4307  * bad packet,...) otherwise return the tcb for this packet
4308  */
4309 #ifdef __GNUC__
4310 __attribute__((noinline))
4311 #endif
4312 static struct sctp_tcb *
4313 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4314     struct sockaddr *src, struct sockaddr *dst,
4315     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4316     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4317     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4318     uint32_t vrf_id, uint16_t port)
4319 {
4320 	struct sctp_association *asoc;
4321 	struct mbuf *op_err;
4322 	char msg[SCTP_DIAG_INFO_LEN];
4323 	uint32_t vtag_in;
4324 	int num_chunks = 0;	/* number of control chunks processed */
4325 	uint32_t chk_length, contiguous;
4326 	int ret;
4327 	int abort_no_unlock = 0;
4328 	int ecne_seen = 0;
4329 	int abort_flag;
4330 
4331 	/*
4332 	 * How big should this be, and should it be alloc'd? Lets try the
4333 	 * d-mtu-ceiling for now (2k) and that should hopefully work ...
4334 	 * until we get into jumbo grams and such..
4335 	 */
4336 	uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4337 	int got_auth = 0;
4338 	uint32_t auth_offset = 0, auth_len = 0;
4339 	int auth_skipped = 0;
4340 	int asconf_cnt = 0;
4341 
4342 	SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4343 	    iphlen, *offset, length, (void *)stcb);
4344 
4345 	if (stcb) {
4346 		SCTP_TCB_LOCK_ASSERT(stcb);
4347 	}
4348 	/* validate chunk header length... */
4349 	if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4350 		SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4351 		    ntohs(ch->chunk_length));
4352 		*offset = length;
4353 		return (stcb);
4354 	}
4355 	/*
4356 	 * validate the verification tag
4357 	 */
4358 	vtag_in = ntohl(sh->v_tag);
4359 
4360 	if (ch->chunk_type == SCTP_INITIATION) {
4361 		SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4362 		    ntohs(ch->chunk_length), vtag_in);
4363 		if (vtag_in != 0) {
4364 			/* protocol error- silently discard... */
4365 			SCTP_STAT_INCR(sctps_badvtag);
4366 			if (stcb != NULL) {
4367 				SCTP_TCB_UNLOCK(stcb);
4368 			}
4369 			return (NULL);
4370 		}
4371 	} else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4372 		/*
4373 		 * If there is no stcb, skip the AUTH chunk and process
4374 		 * later after a stcb is found (to validate the lookup was
4375 		 * valid.
4376 		 */
4377 		if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4378 		    (stcb == NULL) &&
4379 		    (inp->auth_supported == 1)) {
4380 			/* save this chunk for later processing */
4381 			auth_skipped = 1;
4382 			auth_offset = *offset;
4383 			auth_len = ntohs(ch->chunk_length);
4384 
4385 			/* (temporarily) move past this chunk */
4386 			*offset += SCTP_SIZE32(auth_len);
4387 			if (*offset >= length) {
4388 				/* no more data left in the mbuf chain */
4389 				*offset = length;
4390 				return (NULL);
4391 			}
4392 			ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4393 			    sizeof(struct sctp_chunkhdr), chunk_buf);
4394 		}
4395 		if (ch == NULL) {
4396 			/* Help */
4397 			*offset = length;
4398 			return (stcb);
4399 		}
4400 		if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4401 			goto process_control_chunks;
4402 		}
4403 		/*
4404 		 * first check if it's an ASCONF with an unknown src addr we
4405 		 * need to look inside to find the association
4406 		 */
4407 		if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4408 			struct sctp_chunkhdr *asconf_ch = ch;
4409 			uint32_t asconf_offset = 0, asconf_len = 0;
4410 
4411 			/* inp's refcount may be reduced */
4412 			SCTP_INP_INCR_REF(inp);
4413 
4414 			asconf_offset = *offset;
4415 			do {
4416 				asconf_len = ntohs(asconf_ch->chunk_length);
4417 				if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4418 					break;
4419 				stcb = sctp_findassociation_ep_asconf(m,
4420 				    *offset,
4421 				    dst,
4422 				    sh, &inp, netp, vrf_id);
4423 				if (stcb != NULL)
4424 					break;
4425 				asconf_offset += SCTP_SIZE32(asconf_len);
4426 				asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4427 				    sizeof(struct sctp_chunkhdr), chunk_buf);
4428 			} while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4429 			if (stcb == NULL) {
4430 				/*
4431 				 * reduce inp's refcount if not reduced in
4432 				 * sctp_findassociation_ep_asconf().
4433 				 */
4434 				SCTP_INP_DECR_REF(inp);
4435 			}
4436 
4437 			/* now go back and verify any auth chunk to be sure */
4438 			if (auth_skipped && (stcb != NULL)) {
4439 				struct sctp_auth_chunk *auth;
4440 
4441 				if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
4442 					auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
4443 					got_auth = 1;
4444 					auth_skipped = 0;
4445 				} else {
4446 					auth = NULL;
4447 				}
4448 				if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4449 				    auth_offset)) {
4450 					/* auth HMAC failed so dump it */
4451 					*offset = length;
4452 					return (stcb);
4453 				} else {
4454 					/* remaining chunks are HMAC checked */
4455 					stcb->asoc.authenticated = 1;
4456 				}
4457 			}
4458 		}
4459 		if (stcb == NULL) {
4460 			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4461 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4462 			    msg);
4463 			/* no association, so it's out of the blue... */
4464 			sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4465 			    mflowtype, mflowid, inp->fibnum,
4466 			    vrf_id, port);
4467 			*offset = length;
4468 			return (NULL);
4469 		}
4470 		asoc = &stcb->asoc;
4471 		/* ABORT and SHUTDOWN can use either v_tag... */
4472 		if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4473 		    (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4474 		    (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4475 			/* Take the T-bit always into account. */
4476 			if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4477 			    (vtag_in == asoc->my_vtag)) ||
4478 			    (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4479 			    (asoc->peer_vtag != htonl(0)) &&
4480 			    (vtag_in == asoc->peer_vtag))) {
4481 				/* this is valid */
4482 			} else {
4483 				/* drop this packet... */
4484 				SCTP_STAT_INCR(sctps_badvtag);
4485 				if (stcb != NULL) {
4486 					SCTP_TCB_UNLOCK(stcb);
4487 				}
4488 				return (NULL);
4489 			}
4490 		} else {
4491 			/* for all other chunks, vtag must match */
4492 			if (vtag_in != asoc->my_vtag) {
4493 				/* invalid vtag... */
4494 				SCTPDBG(SCTP_DEBUG_INPUT3,
4495 				    "invalid vtag: %xh, expect %xh\n",
4496 				    vtag_in, asoc->my_vtag);
4497 				SCTP_STAT_INCR(sctps_badvtag);
4498 				if (stcb != NULL) {
4499 					SCTP_TCB_UNLOCK(stcb);
4500 				}
4501 				*offset = length;
4502 				return (NULL);
4503 			}
4504 		}
4505 	}			/* end if !SCTP_COOKIE_ECHO */
4506 	/*
4507 	 * process all control chunks...
4508 	 */
4509 	if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4510 	    (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4511 	    (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4512 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4513 		/* implied cookie-ack.. we must have lost the ack */
4514 		sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4515 		    *netp);
4516 	}
4517 
4518 process_control_chunks:
4519 	while (IS_SCTP_CONTROL(ch)) {
4520 		/* validate chunk length */
4521 		chk_length = ntohs(ch->chunk_length);
4522 		SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4523 		    ch->chunk_type, chk_length);
4524 		SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4525 		if (chk_length < sizeof(*ch) ||
4526 		    (*offset + (int)chk_length) > length) {
4527 			*offset = length;
4528 			return (stcb);
4529 		}
4530 		SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4531 		/*
4532 		 * INIT and INIT-ACK only gets the init ack "header" portion
4533 		 * only because we don't have to process the peer's COOKIE.
4534 		 * All others get a complete chunk.
4535 		 */
4536 		switch (ch->chunk_type) {
4537 		case SCTP_INITIATION:
4538 			contiguous = sizeof(struct sctp_init_chunk);
4539 			break;
4540 		case SCTP_INITIATION_ACK:
4541 			contiguous = sizeof(struct sctp_init_ack_chunk);
4542 			break;
4543 		default:
4544 			contiguous = min(chk_length, sizeof(chunk_buf));
4545 			break;
4546 		}
4547 		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4548 		    contiguous,
4549 		    chunk_buf);
4550 		if (ch == NULL) {
4551 			*offset = length;
4552 			return (stcb);
4553 		}
4554 
4555 		num_chunks++;
4556 		/* Save off the last place we got a control from */
4557 		if (stcb != NULL) {
4558 			if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4559 				/*
4560 				 * allow last_control to be NULL if
4561 				 * ASCONF... ASCONF processing will find the
4562 				 * right net later
4563 				 */
4564 				if ((netp != NULL) && (*netp != NULL))
4565 					stcb->asoc.last_control_chunk_from = *netp;
4566 			}
4567 		}
4568 #ifdef SCTP_AUDITING_ENABLED
4569 		sctp_audit_log(0xB0, ch->chunk_type);
4570 #endif
4571 
4572 		/* check to see if this chunk required auth, but isn't */
4573 		if ((stcb != NULL) &&
4574 		    sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4575 		    !stcb->asoc.authenticated) {
4576 			/* "silently" ignore */
4577 			SCTP_STAT_INCR(sctps_recvauthmissing);
4578 			goto next_chunk;
4579 		}
4580 		switch (ch->chunk_type) {
4581 		case SCTP_INITIATION:
4582 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4583 			/* The INIT chunk must be the only chunk. */
4584 			if ((num_chunks > 1) ||
4585 			    (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4586 				/*
4587 				 * RFC 4960bis requires stopping the
4588 				 * processing of the packet.
4589 				 */
4590 				*offset = length;
4591 				return (stcb);
4592 			}
4593 			/* Honor our resource limit. */
4594 			if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4595 				op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4596 				sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
4597 				    mflowtype, mflowid, inp->fibnum,
4598 				    vrf_id, port);
4599 				*offset = length;
4600 				if (stcb != NULL) {
4601 					SCTP_TCB_UNLOCK(stcb);
4602 				}
4603 				return (NULL);
4604 			}
4605 			sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4606 			    (struct sctp_init_chunk *)ch, inp,
4607 			    stcb, *netp,
4608 			    mflowtype, mflowid,
4609 			    vrf_id, port);
4610 			*offset = length;
4611 			if (stcb != NULL) {
4612 				SCTP_TCB_UNLOCK(stcb);
4613 			}
4614 			return (NULL);
4615 			break;
4616 		case SCTP_PAD_CHUNK:
4617 			break;
4618 		case SCTP_INITIATION_ACK:
4619 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4620 			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4621 				/* We are not interested anymore */
4622 				if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4623 					;
4624 				} else {
4625 					*offset = length;
4626 					if (stcb != NULL) {
4627 						(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4628 						    SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4629 					}
4630 					return (NULL);
4631 				}
4632 			}
4633 			/* The INIT-ACK chunk must be the only chunk. */
4634 			if ((num_chunks > 1) ||
4635 			    (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4636 				*offset = length;
4637 				return (stcb);
4638 			}
4639 			if ((netp != NULL) && (*netp != NULL)) {
4640 				ret = sctp_handle_init_ack(m, iphlen, *offset,
4641 				    src, dst, sh,
4642 				    (struct sctp_init_ack_chunk *)ch,
4643 				    stcb, *netp,
4644 				    &abort_no_unlock,
4645 				    mflowtype, mflowid,
4646 				    vrf_id);
4647 			} else {
4648 				ret = -1;
4649 			}
4650 			*offset = length;
4651 			if (abort_no_unlock) {
4652 				return (NULL);
4653 			}
4654 			/*
4655 			 * Special case, I must call the output routine to
4656 			 * get the cookie echoed
4657 			 */
4658 			if ((stcb != NULL) && (ret == 0)) {
4659 				sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4660 			}
4661 			return (stcb);
4662 			break;
4663 		case SCTP_SELECTIVE_ACK:
4664 		case SCTP_NR_SELECTIVE_ACK:
4665 			{
4666 				int abort_now = 0;
4667 				uint32_t a_rwnd, cum_ack;
4668 				uint16_t num_seg, num_nr_seg, num_dup;
4669 				uint8_t flags;
4670 				int offset_seg, offset_dup;
4671 
4672 				SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4673 				    ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4674 				SCTP_STAT_INCR(sctps_recvsacks);
4675 				if (stcb == NULL) {
4676 					SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4677 					    (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4678 					break;
4679 				}
4680 				if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4681 					if (chk_length < sizeof(struct sctp_sack_chunk)) {
4682 						SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4683 						break;
4684 					}
4685 				} else {
4686 					if (stcb->asoc.nrsack_supported == 0) {
4687 						goto unknown_chunk;
4688 					}
4689 					if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4690 						SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4691 						break;
4692 					}
4693 				}
4694 				if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4695 					/*-
4696 					 * If we have sent a shutdown-ack, we will pay no
4697 					 * attention to a sack sent in to us since
4698 					 * we don't care anymore.
4699 					 */
4700 					break;
4701 				}
4702 				flags = ch->chunk_flags;
4703 				if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4704 					struct sctp_sack_chunk *sack;
4705 
4706 					sack = (struct sctp_sack_chunk *)ch;
4707 					cum_ack = ntohl(sack->sack.cum_tsn_ack);
4708 					num_seg = ntohs(sack->sack.num_gap_ack_blks);
4709 					num_nr_seg = 0;
4710 					num_dup = ntohs(sack->sack.num_dup_tsns);
4711 					a_rwnd = ntohl(sack->sack.a_rwnd);
4712 					if (sizeof(struct sctp_sack_chunk) +
4713 					    num_seg * sizeof(struct sctp_gap_ack_block) +
4714 					    num_dup * sizeof(uint32_t) != chk_length) {
4715 						SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4716 						break;
4717 					}
4718 					offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4719 					offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4720 				} else {
4721 					struct sctp_nr_sack_chunk *nr_sack;
4722 
4723 					nr_sack = (struct sctp_nr_sack_chunk *)ch;
4724 					cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4725 					num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4726 					num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4727 					num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4728 					a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4729 					if (sizeof(struct sctp_nr_sack_chunk) +
4730 					    (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4731 					    num_dup * sizeof(uint32_t) != chk_length) {
4732 						SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4733 						break;
4734 					}
4735 					offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4736 					offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4737 				}
4738 				SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4739 				    (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4740 				    cum_ack, num_seg, a_rwnd);
4741 				stcb->asoc.seen_a_sack_this_pkt = 1;
4742 				if ((stcb->asoc.pr_sctp_cnt == 0) &&
4743 				    (num_seg == 0) && (num_nr_seg == 0) &&
4744 				    SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4745 				    (stcb->asoc.saw_sack_with_frags == 0) &&
4746 				    (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4747 				    (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4748 					/*
4749 					 * We have a SIMPLE sack having no
4750 					 * prior segments and data on sent
4751 					 * queue to be acked. Use the faster
4752 					 * path sack processing. We also
4753 					 * allow window update sacks with no
4754 					 * missing segments to go this way
4755 					 * too.
4756 					 */
4757 					sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4758 					    &abort_now, ecne_seen);
4759 				} else {
4760 					if ((netp != NULL) && (*netp != NULL)) {
4761 						sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4762 						    num_seg, num_nr_seg, num_dup, &abort_now, flags,
4763 						    cum_ack, a_rwnd, ecne_seen);
4764 					}
4765 				}
4766 				if (abort_now) {
4767 					/* ABORT signal from sack processing */
4768 					*offset = length;
4769 					return (NULL);
4770 				}
4771 				if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4772 				    TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4773 				    (stcb->asoc.stream_queue_cnt == 0)) {
4774 					sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4775 				}
4776 				break;
4777 			}
4778 		case SCTP_HEARTBEAT_REQUEST:
4779 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4780 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4781 				SCTP_STAT_INCR(sctps_recvheartbeat);
4782 				sctp_send_heartbeat_ack(stcb, m, *offset,
4783 				    chk_length, *netp);
4784 			}
4785 			break;
4786 		case SCTP_HEARTBEAT_ACK:
4787 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
4788 			if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
4789 				/* Its not ours */
4790 				break;
4791 			}
4792 			SCTP_STAT_INCR(sctps_recvheartbeatack);
4793 			if ((netp != NULL) && (*netp != NULL)) {
4794 				sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
4795 				    stcb, *netp);
4796 			}
4797 			break;
4798 		case SCTP_ABORT_ASSOCIATION:
4799 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
4800 			    (void *)stcb);
4801 			*offset = length;
4802 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4803 				if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
4804 					return (NULL);
4805 				} else {
4806 					return (stcb);
4807 				}
4808 			} else {
4809 				return (NULL);
4810 			}
4811 			break;
4812 		case SCTP_SHUTDOWN:
4813 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
4814 			    (void *)stcb);
4815 			if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
4816 				break;
4817 			}
4818 			if ((netp != NULL) && (*netp != NULL)) {
4819 				abort_flag = 0;
4820 				sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
4821 				    stcb, *netp, &abort_flag);
4822 				if (abort_flag) {
4823 					*offset = length;
4824 					return (NULL);
4825 				}
4826 			}
4827 			break;
4828 		case SCTP_SHUTDOWN_ACK:
4829 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
4830 			if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) &&
4831 			    (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
4832 				sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
4833 				*offset = length;
4834 				return (NULL);
4835 			}
4836 			break;
4837 		case SCTP_OPERATION_ERROR:
4838 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
4839 			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
4840 			    sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
4841 				*offset = length;
4842 				return (NULL);
4843 			}
4844 			break;
4845 		case SCTP_COOKIE_ECHO:
4846 			SCTPDBG(SCTP_DEBUG_INPUT3,
4847 			    "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
4848 			if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
4849 				;
4850 			} else {
4851 				if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4852 					/* We are not interested anymore */
4853 			abend:
4854 					if (stcb != NULL) {
4855 						SCTP_TCB_UNLOCK(stcb);
4856 					}
4857 					*offset = length;
4858 					return (NULL);
4859 				}
4860 			}
4861 			/*-
4862 			 * First are we accepting? We do this again here
4863 			 * since it is possible that a previous endpoint WAS
4864 			 * listening responded to a INIT-ACK and then
4865 			 * closed. We opened and bound.. and are now no
4866 			 * longer listening.
4867 			 *
4868 			 * XXXGL: notes on checking listen queue length.
4869 			 * 1) SCTP_IS_LISTENING() doesn't necessarily mean
4870 			 *    SOLISTENING(), because a listening "UDP type"
4871 			 *    socket isn't listening in terms of the socket
4872 			 *    layer.  It is a normal data flow socket, that
4873 			 *    can fork off new connections.  Thus, we should
4874 			 *    look into sol_qlen only in case we are !UDP.
4875 			 * 2) Checking sol_qlen in general requires locking
4876 			 *    the socket, and this code lacks that.
4877 			 */
4878 			if ((stcb == NULL) &&
4879 			    (!SCTP_IS_LISTENING(inp) ||
4880 			    (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
4881 			    inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
4882 				if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
4883 				    (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
4884 					op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4885 					sctp_abort_association(inp, stcb, m, iphlen,
4886 					    src, dst, sh, op_err,
4887 					    mflowtype, mflowid,
4888 					    vrf_id, port);
4889 				}
4890 				*offset = length;
4891 				return (NULL);
4892 			} else {
4893 				struct mbuf *ret_buf;
4894 				struct sctp_inpcb *linp;
4895 				struct sctp_tmit_chunk *chk;
4896 
4897 				if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE |
4898 				    SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
4899 					goto abend;
4900 				}
4901 
4902 				if (stcb) {
4903 					linp = NULL;
4904 				} else {
4905 					linp = inp;
4906 				}
4907 
4908 				if (linp != NULL) {
4909 					SCTP_ASOC_CREATE_LOCK(linp);
4910 				}
4911 
4912 				if (netp != NULL) {
4913 					struct sctp_tcb *locked_stcb;
4914 
4915 					locked_stcb = stcb;
4916 					ret_buf =
4917 					    sctp_handle_cookie_echo(m, iphlen,
4918 					    *offset,
4919 					    src, dst,
4920 					    sh,
4921 					    (struct sctp_cookie_echo_chunk *)ch,
4922 					    &inp, &stcb, netp,
4923 					    auth_skipped,
4924 					    auth_offset,
4925 					    auth_len,
4926 					    &locked_stcb,
4927 					    mflowtype,
4928 					    mflowid,
4929 					    vrf_id,
4930 					    port);
4931 					if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
4932 						SCTP_TCB_UNLOCK(locked_stcb);
4933 					}
4934 					if (stcb != NULL) {
4935 						SCTP_TCB_LOCK_ASSERT(stcb);
4936 					}
4937 				} else {
4938 					ret_buf = NULL;
4939 				}
4940 				if (linp != NULL) {
4941 					SCTP_ASOC_CREATE_UNLOCK(linp);
4942 				}
4943 				if (ret_buf == NULL) {
4944 					if (stcb != NULL) {
4945 						SCTP_TCB_UNLOCK(stcb);
4946 					}
4947 					SCTPDBG(SCTP_DEBUG_INPUT3,
4948 					    "GAK, null buffer\n");
4949 					*offset = length;
4950 					return (NULL);
4951 				}
4952 				/* if AUTH skipped, see if it verified... */
4953 				if (auth_skipped) {
4954 					got_auth = 1;
4955 					auth_skipped = 0;
4956 				}
4957 				/* Restart the timer if we have pending data */
4958 				TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
4959 					if (chk->whoTo != NULL) {
4960 						break;
4961 					}
4962 				}
4963 				if (chk != NULL) {
4964 					sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
4965 				}
4966 			}
4967 			break;
4968 		case SCTP_COOKIE_ACK:
4969 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
4970 			if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
4971 				break;
4972 			}
4973 			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4974 				/* We are not interested anymore */
4975 				if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4976 					;
4977 				} else if (stcb) {
4978 					(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4979 					    SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
4980 					*offset = length;
4981 					return (NULL);
4982 				}
4983 			}
4984 			if ((netp != NULL) && (*netp != NULL)) {
4985 				sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
4986 			}
4987 			break;
4988 		case SCTP_ECN_ECHO:
4989 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
4990 			if (stcb == NULL) {
4991 				break;
4992 			}
4993 			if (stcb->asoc.ecn_supported == 0) {
4994 				goto unknown_chunk;
4995 			}
4996 			if ((chk_length != sizeof(struct sctp_ecne_chunk)) &&
4997 			    (chk_length != sizeof(struct old_sctp_ecne_chunk))) {
4998 				break;
4999 			}
5000 			sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5001 			ecne_seen = 1;
5002 			break;
5003 		case SCTP_ECN_CWR:
5004 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5005 			if (stcb == NULL) {
5006 				break;
5007 			}
5008 			if (stcb->asoc.ecn_supported == 0) {
5009 				goto unknown_chunk;
5010 			}
5011 			if (chk_length != sizeof(struct sctp_cwr_chunk)) {
5012 				break;
5013 			}
5014 			sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5015 			break;
5016 		case SCTP_SHUTDOWN_COMPLETE:
5017 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5018 			/* must be first and only chunk */
5019 			if ((num_chunks > 1) ||
5020 			    (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5021 				*offset = length;
5022 				return (stcb);
5023 			}
5024 			if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) &&
5025 			    (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5026 				sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5027 				    stcb, *netp);
5028 				*offset = length;
5029 				return (NULL);
5030 			}
5031 			break;
5032 		case SCTP_ASCONF:
5033 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5034 			if (stcb != NULL) {
5035 				if (stcb->asoc.asconf_supported == 0) {
5036 					goto unknown_chunk;
5037 				}
5038 				sctp_handle_asconf(m, *offset, src,
5039 				    (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5040 				asconf_cnt++;
5041 			}
5042 			break;
5043 		case SCTP_ASCONF_ACK:
5044 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5045 			if (stcb == NULL) {
5046 				break;
5047 			}
5048 			if (stcb->asoc.asconf_supported == 0) {
5049 				goto unknown_chunk;
5050 			}
5051 			if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5052 				break;
5053 			}
5054 			if ((netp != NULL) && (*netp != NULL)) {
5055 				/* He's alive so give him credit */
5056 				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5057 					sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5058 					    stcb->asoc.overall_error_count,
5059 					    0,
5060 					    SCTP_FROM_SCTP_INPUT,
5061 					    __LINE__);
5062 				}
5063 				stcb->asoc.overall_error_count = 0;
5064 				sctp_handle_asconf_ack(m, *offset,
5065 				    (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5066 				if (abort_no_unlock)
5067 					return (NULL);
5068 			}
5069 			break;
5070 		case SCTP_FORWARD_CUM_TSN:
5071 		case SCTP_IFORWARD_CUM_TSN:
5072 			SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5073 			    ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
5074 			if (stcb == NULL) {
5075 				break;
5076 			}
5077 			if (stcb->asoc.prsctp_supported == 0) {
5078 				goto unknown_chunk;
5079 			}
5080 			if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5081 				break;
5082 			}
5083 			if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
5084 			    ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
5085 				if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
5086 					SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
5087 				} else {
5088 					SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
5089 				}
5090 				op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5091 				sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
5092 				*offset = length;
5093 				return (NULL);
5094 			}
5095 			*fwd_tsn_seen = 1;
5096 			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5097 				/* We are not interested anymore */
5098 				(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5099 				    SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5100 				*offset = length;
5101 				return (NULL);
5102 			}
5103 			/*
5104 			 * For sending a SACK this looks like DATA chunks.
5105 			 */
5106 			stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5107 			abort_flag = 0;
5108 			sctp_handle_forward_tsn(stcb,
5109 			    (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5110 			if (abort_flag) {
5111 				*offset = length;
5112 				return (NULL);
5113 			}
5114 			break;
5115 		case SCTP_STREAM_RESET:
5116 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5117 			if (stcb == NULL) {
5118 				break;
5119 			}
5120 			if (stcb->asoc.reconfig_supported == 0) {
5121 				goto unknown_chunk;
5122 			}
5123 			if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) {
5124 				break;
5125 			}
5126 			if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5127 				/* stop processing */
5128 				*offset = length;
5129 				return (NULL);
5130 			}
5131 			break;
5132 		case SCTP_PACKET_DROPPED:
5133 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5134 			if (stcb == NULL) {
5135 				break;
5136 			}
5137 			if (stcb->asoc.pktdrop_supported == 0) {
5138 				goto unknown_chunk;
5139 			}
5140 			if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5141 				break;
5142 			}
5143 			if ((netp != NULL) && (*netp != NULL)) {
5144 				sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5145 				    stcb, *netp,
5146 				    min(chk_length, contiguous));
5147 			}
5148 			break;
5149 		case SCTP_AUTHENTICATION:
5150 			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5151 			if (stcb == NULL) {
5152 				/* save the first AUTH for later processing */
5153 				if (auth_skipped == 0) {
5154 					auth_offset = *offset;
5155 					auth_len = chk_length;
5156 					auth_skipped = 1;
5157 				}
5158 				/* skip this chunk (temporarily) */
5159 				break;
5160 			}
5161 			if (stcb->asoc.auth_supported == 0) {
5162 				goto unknown_chunk;
5163 			}
5164 			if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5165 			    (chk_length > (sizeof(struct sctp_auth_chunk) +
5166 			    SCTP_AUTH_DIGEST_LEN_MAX))) {
5167 				/* Its not ours */
5168 				*offset = length;
5169 				return (stcb);
5170 			}
5171 			if (got_auth == 1) {
5172 				/* skip this chunk... it's already auth'd */
5173 				break;
5174 			}
5175 			got_auth = 1;
5176 			if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
5177 				/* auth HMAC failed so dump the packet */
5178 				*offset = length;
5179 				return (stcb);
5180 			} else {
5181 				/* remaining chunks are HMAC checked */
5182 				stcb->asoc.authenticated = 1;
5183 			}
5184 			break;
5185 
5186 		default:
5187 	unknown_chunk:
5188 			/* it's an unknown chunk! */
5189 			if ((ch->chunk_type & 0x40) &&
5190 			    (stcb != NULL) &&
5191 			    (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
5192 			    (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
5193 			    (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5194 				struct sctp_gen_error_cause *cause;
5195 				int len;
5196 
5197 				op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5198 				    0, M_NOWAIT, 1, MT_DATA);
5199 				if (op_err != NULL) {
5200 					len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5201 					cause = mtod(op_err, struct sctp_gen_error_cause *);
5202 					cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5203 					cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5204 					SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5205 					SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5206 					if (SCTP_BUF_NEXT(op_err) != NULL) {
5207 #ifdef SCTP_MBUF_LOGGING
5208 						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5209 							sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5210 						}
5211 #endif
5212 						sctp_queue_op_err(stcb, op_err);
5213 					} else {
5214 						sctp_m_freem(op_err);
5215 					}
5216 				}
5217 			}
5218 			if ((ch->chunk_type & 0x80) == 0) {
5219 				/* discard this packet */
5220 				*offset = length;
5221 				return (stcb);
5222 			}	/* else skip this bad chunk and continue... */
5223 			break;
5224 		}		/* switch (ch->chunk_type) */
5225 
5226 next_chunk:
5227 		/* get the next chunk */
5228 		*offset += SCTP_SIZE32(chk_length);
5229 		if (*offset >= length) {
5230 			/* no more data left in the mbuf chain */
5231 			break;
5232 		}
5233 		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5234 		    sizeof(struct sctp_chunkhdr), chunk_buf);
5235 		if (ch == NULL) {
5236 			*offset = length;
5237 			return (stcb);
5238 		}
5239 	}			/* while */
5240 
5241 	if ((asconf_cnt > 0) && (stcb != NULL)) {
5242 		sctp_send_asconf_ack(stcb);
5243 	}
5244 	return (stcb);
5245 }
5246 
5247 /*
5248  * common input chunk processing (v4 and v6)
5249  */
5250 void
5251 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5252     struct sockaddr *src, struct sockaddr *dst,
5253     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5254     uint8_t compute_crc,
5255     uint8_t ecn_bits,
5256     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5257     uint32_t vrf_id, uint16_t port)
5258 {
5259 	uint32_t high_tsn;
5260 	int fwd_tsn_seen = 0, data_processed = 0;
5261 	struct mbuf *m = *mm, *op_err;
5262 	char msg[SCTP_DIAG_INFO_LEN];
5263 	int un_sent;
5264 	int cnt_ctrl_ready = 0;
5265 	struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5266 	struct sctp_tcb *stcb = NULL;
5267 	struct sctp_nets *net = NULL;
5268 
5269 	SCTP_STAT_INCR(sctps_recvdatagrams);
5270 #ifdef SCTP_AUDITING_ENABLED
5271 	sctp_audit_log(0xE0, 1);
5272 	sctp_auditing(0, inp, stcb, net);
5273 #endif
5274 	if (compute_crc != 0) {
5275 		uint32_t check, calc_check;
5276 
5277 		check = sh->checksum;
5278 		sh->checksum = 0;
5279 		calc_check = sctp_calculate_cksum(m, iphlen);
5280 		sh->checksum = check;
5281 		if (calc_check != check) {
5282 			SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5283 			    calc_check, check, (void *)m, length, iphlen);
5284 			stcb = sctp_findassociation_addr(m, offset, src, dst,
5285 			    sh, ch, &inp, &net, vrf_id);
5286 #if defined(INET) || defined(INET6)
5287 			if ((ch->chunk_type != SCTP_INITIATION) &&
5288 			    (net != NULL) && (net->port != port)) {
5289 				if (net->port == 0) {
5290 					/* UDP encapsulation turned on. */
5291 					net->mtu -= sizeof(struct udphdr);
5292 					if (stcb->asoc.smallest_mtu > net->mtu) {
5293 						sctp_pathmtu_adjustment(stcb, net->mtu);
5294 					}
5295 				} else if (port == 0) {
5296 					/* UDP encapsulation turned off. */
5297 					net->mtu += sizeof(struct udphdr);
5298 					/* XXX Update smallest_mtu */
5299 				}
5300 				net->port = port;
5301 			}
5302 #endif
5303 			if (net != NULL) {
5304 				net->flowtype = mflowtype;
5305 				net->flowid = mflowid;
5306 			}
5307 			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5308 			if ((inp != NULL) && (stcb != NULL)) {
5309 				sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5310 				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5311 			} else if ((inp != NULL) && (stcb == NULL)) {
5312 				inp_decr = inp;
5313 			}
5314 			SCTP_STAT_INCR(sctps_badsum);
5315 			SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5316 			goto out;
5317 		}
5318 	}
5319 	/* Destination port of 0 is illegal, based on RFC4960. */
5320 	if (sh->dest_port == 0) {
5321 		SCTP_STAT_INCR(sctps_hdrops);
5322 		goto out;
5323 	}
5324 	stcb = sctp_findassociation_addr(m, offset, src, dst,
5325 	    sh, ch, &inp, &net, vrf_id);
5326 #if defined(INET) || defined(INET6)
5327 	if ((ch->chunk_type != SCTP_INITIATION) &&
5328 	    (net != NULL) && (net->port != port)) {
5329 		if (net->port == 0) {
5330 			/* UDP encapsulation turned on. */
5331 			net->mtu -= sizeof(struct udphdr);
5332 			if (stcb->asoc.smallest_mtu > net->mtu) {
5333 				sctp_pathmtu_adjustment(stcb, net->mtu);
5334 			}
5335 		} else if (port == 0) {
5336 			/* UDP encapsulation turned off. */
5337 			net->mtu += sizeof(struct udphdr);
5338 			/* XXX Update smallest_mtu */
5339 		}
5340 		net->port = port;
5341 	}
5342 #endif
5343 	if (net != NULL) {
5344 		net->flowtype = mflowtype;
5345 		net->flowid = mflowid;
5346 	}
5347 	if (inp == NULL) {
5348 		SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5349 		SCTP_STAT_INCR(sctps_noport);
5350 		if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5351 			goto out;
5352 		}
5353 		if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5354 			sctp_send_shutdown_complete2(src, dst, sh,
5355 			    mflowtype, mflowid, fibnum,
5356 			    vrf_id, port);
5357 			goto out;
5358 		}
5359 		if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5360 			goto out;
5361 		}
5362 		if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5363 			if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5364 			    ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5365 			    (ch->chunk_type != SCTP_INIT))) {
5366 				op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5367 				    "Out of the blue");
5368 				sctp_send_abort(m, iphlen, src, dst,
5369 				    sh, 0, op_err,
5370 				    mflowtype, mflowid, fibnum,
5371 				    vrf_id, port);
5372 			}
5373 		}
5374 		goto out;
5375 	} else if (stcb == NULL) {
5376 		inp_decr = inp;
5377 	}
5378 	SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5379 	    (void *)m, iphlen, offset, length, (void *)stcb);
5380 	if (stcb) {
5381 		/* always clear this before beginning a packet */
5382 		stcb->asoc.authenticated = 0;
5383 		stcb->asoc.seen_a_sack_this_pkt = 0;
5384 		SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5385 		    (void *)stcb, stcb->asoc.state);
5386 
5387 		if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5388 		    (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5389 			/*-
5390 			 * If we hit here, we had a ref count
5391 			 * up when the assoc was aborted and the
5392 			 * timer is clearing out the assoc, we should
5393 			 * NOT respond to any packet.. its OOTB.
5394 			 */
5395 			SCTP_TCB_UNLOCK(stcb);
5396 			stcb = NULL;
5397 			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5398 			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5399 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5400 			    msg);
5401 			sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5402 			    mflowtype, mflowid, inp->fibnum,
5403 			    vrf_id, port);
5404 			goto out;
5405 		}
5406 	}
5407 	if (IS_SCTP_CONTROL(ch)) {
5408 		/* process the control portion of the SCTP packet */
5409 		/* sa_ignore NO_NULL_CHK */
5410 		stcb = sctp_process_control(m, iphlen, &offset, length,
5411 		    src, dst, sh, ch,
5412 		    inp, stcb, &net, &fwd_tsn_seen,
5413 		    mflowtype, mflowid, fibnum,
5414 		    vrf_id, port);
5415 		if (stcb) {
5416 			/*
5417 			 * This covers us if the cookie-echo was there and
5418 			 * it changes our INP.
5419 			 */
5420 			inp = stcb->sctp_ep;
5421 #if defined(INET) || defined(INET6)
5422 			if ((ch->chunk_type != SCTP_INITIATION) &&
5423 			    (net != NULL) && (net->port != port)) {
5424 				if (net->port == 0) {
5425 					/* UDP encapsulation turned on. */
5426 					net->mtu -= sizeof(struct udphdr);
5427 					if (stcb->asoc.smallest_mtu > net->mtu) {
5428 						sctp_pathmtu_adjustment(stcb, net->mtu);
5429 					}
5430 				} else if (port == 0) {
5431 					/* UDP encapsulation turned off. */
5432 					net->mtu += sizeof(struct udphdr);
5433 					/* XXX Update smallest_mtu */
5434 				}
5435 				net->port = port;
5436 			}
5437 #endif
5438 		}
5439 	} else {
5440 		/*
5441 		 * no control chunks, so pre-process DATA chunks (these
5442 		 * checks are taken care of by control processing)
5443 		 */
5444 
5445 		/*
5446 		 * if DATA only packet, and auth is required, then punt...
5447 		 * can't have authenticated without any AUTH (control)
5448 		 * chunks
5449 		 */
5450 		if ((stcb != NULL) &&
5451 		    sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5452 			/* "silently" ignore */
5453 			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5454 			SCTP_STAT_INCR(sctps_recvauthmissing);
5455 			goto out;
5456 		}
5457 		if (stcb == NULL) {
5458 			/* out of the blue DATA chunk */
5459 			SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5460 			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5461 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5462 			    msg);
5463 			sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5464 			    mflowtype, mflowid, fibnum,
5465 			    vrf_id, port);
5466 			goto out;
5467 		}
5468 		if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5469 			/* v_tag mismatch! */
5470 			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5471 			SCTP_STAT_INCR(sctps_badvtag);
5472 			goto out;
5473 		}
5474 	}
5475 
5476 	SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5477 	if (stcb == NULL) {
5478 		/*
5479 		 * no valid TCB for this packet, or we found it's a bad
5480 		 * packet while processing control, or we're done with this
5481 		 * packet (done or skip rest of data), so we drop it...
5482 		 */
5483 		goto out;
5484 	}
5485 
5486 	/*
5487 	 * DATA chunk processing
5488 	 */
5489 	/* plow through the data chunks while length > offset */
5490 
5491 	/*
5492 	 * Rest should be DATA only.  Check authentication state if AUTH for
5493 	 * DATA is required.
5494 	 */
5495 	if ((length > offset) &&
5496 	    (stcb != NULL) &&
5497 	    sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5498 	    !stcb->asoc.authenticated) {
5499 		/* "silently" ignore */
5500 		SCTP_STAT_INCR(sctps_recvauthmissing);
5501 		SCTPDBG(SCTP_DEBUG_AUTH1,
5502 		    "Data chunk requires AUTH, skipped\n");
5503 		goto trigger_send;
5504 	}
5505 	if (length > offset) {
5506 		int retval;
5507 
5508 		/*
5509 		 * First check to make sure our state is correct. We would
5510 		 * not get here unless we really did have a tag, so we don't
5511 		 * abort if this happens, just dump the chunk silently.
5512 		 */
5513 		switch (SCTP_GET_STATE(stcb)) {
5514 		case SCTP_STATE_COOKIE_ECHOED:
5515 			/*
5516 			 * we consider data with valid tags in this state
5517 			 * shows us the cookie-ack was lost. Imply it was
5518 			 * there.
5519 			 */
5520 			sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5521 			break;
5522 		case SCTP_STATE_COOKIE_WAIT:
5523 			/*
5524 			 * We consider OOTB any data sent during asoc setup.
5525 			 */
5526 			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5527 			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5528 			    msg);
5529 			sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5530 			    mflowtype, mflowid, inp->fibnum,
5531 			    vrf_id, port);
5532 			goto out;
5533 			/* sa_ignore NOTREACHED */
5534 			break;
5535 		case SCTP_STATE_EMPTY:	/* should not happen */
5536 		case SCTP_STATE_INUSE:	/* should not happen */
5537 		case SCTP_STATE_SHUTDOWN_RECEIVED:	/* This is a peer error */
5538 		case SCTP_STATE_SHUTDOWN_ACK_SENT:
5539 		default:
5540 			goto out;
5541 			/* sa_ignore NOTREACHED */
5542 			break;
5543 		case SCTP_STATE_OPEN:
5544 		case SCTP_STATE_SHUTDOWN_SENT:
5545 			break;
5546 		}
5547 		/* plow through the data chunks while length > offset */
5548 		retval = sctp_process_data(mm, iphlen, &offset, length,
5549 		    inp, stcb, net, &high_tsn);
5550 		if (retval == 2) {
5551 			/*
5552 			 * The association aborted, NO UNLOCK needed since
5553 			 * the association is destroyed.
5554 			 */
5555 			stcb = NULL;
5556 			goto out;
5557 		}
5558 		if (retval == 0) {
5559 			data_processed = 1;
5560 		}
5561 		/*
5562 		 * Anything important needs to have been m_copy'ed in
5563 		 * process_data
5564 		 */
5565 	}
5566 
5567 	/* take care of ecn */
5568 	if ((data_processed == 1) &&
5569 	    (stcb->asoc.ecn_supported == 1) &&
5570 	    ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5571 		/* Yep, we need to add a ECNE */
5572 		sctp_send_ecn_echo(stcb, net, high_tsn);
5573 	}
5574 
5575 	if ((data_processed == 0) && (fwd_tsn_seen)) {
5576 		int was_a_gap;
5577 		uint32_t highest_tsn;
5578 
5579 		if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5580 			highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5581 		} else {
5582 			highest_tsn = stcb->asoc.highest_tsn_inside_map;
5583 		}
5584 		was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5585 		stcb->asoc.send_sack = 1;
5586 		sctp_sack_check(stcb, was_a_gap);
5587 	} else if (fwd_tsn_seen) {
5588 		stcb->asoc.send_sack = 1;
5589 	}
5590 	/* trigger send of any chunks in queue... */
5591 trigger_send:
5592 #ifdef SCTP_AUDITING_ENABLED
5593 	sctp_audit_log(0xE0, 2);
5594 	sctp_auditing(1, inp, stcb, net);
5595 #endif
5596 	SCTPDBG(SCTP_DEBUG_INPUT1,
5597 	    "Check for chunk output prw:%d tqe:%d tf=%d\n",
5598 	    stcb->asoc.peers_rwnd,
5599 	    TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5600 	    stcb->asoc.total_flight);
5601 	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5602 	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5603 		cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5604 	}
5605 	if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5606 	    cnt_ctrl_ready ||
5607 	    stcb->asoc.trigger_reset ||
5608 	    ((un_sent > 0) &&
5609 	    (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
5610 		SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5611 		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5612 		SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5613 	}
5614 #ifdef SCTP_AUDITING_ENABLED
5615 	sctp_audit_log(0xE0, 3);
5616 	sctp_auditing(2, inp, stcb, net);
5617 #endif
5618 out:
5619 	if (stcb != NULL) {
5620 		SCTP_TCB_UNLOCK(stcb);
5621 	}
5622 	if (inp_decr != NULL) {
5623 		/* reduce ref-count */
5624 		SCTP_INP_WLOCK(inp_decr);
5625 		SCTP_INP_DECR_REF(inp_decr);
5626 		SCTP_INP_WUNLOCK(inp_decr);
5627 	}
5628 	return;
5629 }
5630 
5631 #ifdef INET
5632 void
5633 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5634 {
5635 	struct mbuf *m;
5636 	int iphlen;
5637 	uint32_t vrf_id = 0;
5638 	uint8_t ecn_bits;
5639 	struct sockaddr_in src, dst;
5640 	struct ip *ip;
5641 	struct sctphdr *sh;
5642 	struct sctp_chunkhdr *ch;
5643 	int length, offset;
5644 	uint8_t compute_crc;
5645 	uint32_t mflowid;
5646 	uint8_t mflowtype;
5647 	uint16_t fibnum;
5648 
5649 	iphlen = off;
5650 	if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5651 		SCTP_RELEASE_PKT(i_pak);
5652 		return;
5653 	}
5654 	m = SCTP_HEADER_TO_CHAIN(i_pak);
5655 #ifdef SCTP_MBUF_LOGGING
5656 	/* Log in any input mbufs */
5657 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5658 		sctp_log_mbc(m, SCTP_MBUF_INPUT);
5659 	}
5660 #endif
5661 #ifdef SCTP_PACKET_LOGGING
5662 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5663 		sctp_packet_log(m);
5664 	}
5665 #endif
5666 	SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5667 	    "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5668 	    m->m_pkthdr.len,
5669 	    if_name(m->m_pkthdr.rcvif),
5670 	    (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5671 	mflowid = m->m_pkthdr.flowid;
5672 	mflowtype = M_HASHTYPE_GET(m);
5673 	fibnum = M_GETFIB(m);
5674 	SCTP_STAT_INCR(sctps_recvpackets);
5675 	SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5676 	/* Get IP, SCTP, and first chunk header together in the first mbuf. */
5677 	offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5678 	if (SCTP_BUF_LEN(m) < offset) {
5679 		if ((m = m_pullup(m, offset)) == NULL) {
5680 			SCTP_STAT_INCR(sctps_hdrops);
5681 			return;
5682 		}
5683 	}
5684 	ip = mtod(m, struct ip *);
5685 	sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5686 	ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5687 	offset -= sizeof(struct sctp_chunkhdr);
5688 	memset(&src, 0, sizeof(struct sockaddr_in));
5689 	src.sin_family = AF_INET;
5690 	src.sin_len = sizeof(struct sockaddr_in);
5691 	src.sin_port = sh->src_port;
5692 	src.sin_addr = ip->ip_src;
5693 	memset(&dst, 0, sizeof(struct sockaddr_in));
5694 	dst.sin_family = AF_INET;
5695 	dst.sin_len = sizeof(struct sockaddr_in);
5696 	dst.sin_port = sh->dest_port;
5697 	dst.sin_addr = ip->ip_dst;
5698 	length = ntohs(ip->ip_len);
5699 	/* Validate mbuf chain length with IP payload length. */
5700 	if (SCTP_HEADER_LEN(m) != length) {
5701 		SCTPDBG(SCTP_DEBUG_INPUT1,
5702 		    "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5703 		SCTP_STAT_INCR(sctps_hdrops);
5704 		goto out;
5705 	}
5706 	/* SCTP does not allow broadcasts or multicasts */
5707 	if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5708 		goto out;
5709 	}
5710 	if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5711 		goto out;
5712 	}
5713 	ecn_bits = ip->ip_tos;
5714 	if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5715 		SCTP_STAT_INCR(sctps_recvhwcrc);
5716 		compute_crc = 0;
5717 	} else {
5718 		SCTP_STAT_INCR(sctps_recvswcrc);
5719 		compute_crc = 1;
5720 	}
5721 	sctp_common_input_processing(&m, iphlen, offset, length,
5722 	    (struct sockaddr *)&src,
5723 	    (struct sockaddr *)&dst,
5724 	    sh, ch,
5725 	    compute_crc,
5726 	    ecn_bits,
5727 	    mflowtype, mflowid, fibnum,
5728 	    vrf_id, port);
5729 out:
5730 	if (m) {
5731 		sctp_m_freem(m);
5732 	}
5733 	return;
5734 }
5735 
5736 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5737 extern int *sctp_cpuarry;
5738 #endif
5739 
5740 int
5741 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
5742 {
5743 	struct mbuf *m;
5744 	int off;
5745 
5746 	m = *mp;
5747 	off = *offp;
5748 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
5749 	if (mp_ncpus > 1) {
5750 		struct ip *ip;
5751 		struct sctphdr *sh;
5752 		int offset;
5753 		int cpu_to_use;
5754 		uint32_t flowid, tag;
5755 
5756 		if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
5757 			flowid = m->m_pkthdr.flowid;
5758 		} else {
5759 			/*
5760 			 * No flow id built by lower layers fix it so we
5761 			 * create one.
5762 			 */
5763 			offset = off + sizeof(struct sctphdr);
5764 			if (SCTP_BUF_LEN(m) < offset) {
5765 				if ((m = m_pullup(m, offset)) == NULL) {
5766 					SCTP_STAT_INCR(sctps_hdrops);
5767 					return (IPPROTO_DONE);
5768 				}
5769 			}
5770 			ip = mtod(m, struct ip *);
5771 			sh = (struct sctphdr *)((caddr_t)ip + off);
5772 			tag = htonl(sh->v_tag);
5773 			flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
5774 			m->m_pkthdr.flowid = flowid;
5775 			M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
5776 		}
5777 		cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
5778 		sctp_queue_to_mcore(m, off, cpu_to_use);
5779 		return (IPPROTO_DONE);
5780 	}
5781 #endif
5782 	sctp_input_with_port(m, off, 0);
5783 	return (IPPROTO_DONE);
5784 }
5785 #endif
5786