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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Copyright (c) 1999-2000 Cisco, Inc.
3 * Copyright (c) 1999-2001 Motorola, Inc.
4 * Copyright (c) 2001-2002 International Business Machines, Corp.
5 * Copyright (c) 2001 Intel Corp.
6 * Copyright (c) 2001 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
8 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05009 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
11 * This abstraction represents an SCTP endpoint.
12 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050013 * The SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050019 * The SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
29 *
30 * Please send any bug reports or fixes you make to the
31 * email address(es):
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 *
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
36 *
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * Jon Grimm <jgrimm@austin.ibm.com>
41 * Daisy Chang <daisyc@us.ibm.com>
42 * Dajiang Zhang <dajiang.zhang@nokia.com>
43 *
44 * Any bugs reported given to us we will try to fix... any fixes shared will
45 * be incorporated into the next SCTP release.
46 */
47
48#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/slab.h>
50#include <linux/in.h>
51#include <linux/random.h> /* get_random_bytes() */
52#include <linux/crypto.h>
53#include <net/sock.h>
54#include <net/ipv6.h>
55#include <net/sctp/sctp.h>
56#include <net/sctp/sm.h>
57
58/* Forward declarations for internal helpers. */
David Howellsc4028952006-11-22 14:57:56 +000059static void sctp_endpoint_bh_rcv(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61/*
62 * Initialize the base fields of the endpoint structure.
63 */
64static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -070065 struct sock *sk,
Al Virodd0fc662005-10-07 07:46:04 +010066 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +000068 struct net *net = sock_net(sk);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -070069 struct sctp_hmac_algo_param *auth_hmacs = NULL;
70 struct sctp_chunks_param *auth_chunks = NULL;
71 struct sctp_shared_key *null_key;
72 int err;
73
Vlad Yasevichb68dbca2006-11-09 16:29:57 -080074 ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp);
75 if (!ep->digest)
76 return NULL;
77
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +000078 if (net->sctp.auth_enable) {
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -070079 /* Allocate space for HMACS and CHUNKS authentication
80 * variables. There are arrays that we encode directly
81 * into parameters to make the rest of the operations easier.
82 */
83 auth_hmacs = kzalloc(sizeof(sctp_hmac_algo_param_t) +
84 sizeof(__u16) * SCTP_AUTH_NUM_HMACS, gfp);
85 if (!auth_hmacs)
86 goto nomem;
87
88 auth_chunks = kzalloc(sizeof(sctp_chunks_param_t) +
89 SCTP_NUM_CHUNK_TYPES, gfp);
90 if (!auth_chunks)
91 goto nomem;
92
93 /* Initialize the HMACS parameter.
94 * SCTP-AUTH: Section 3.3
95 * Every endpoint supporting SCTP chunk authentication MUST
96 * support the HMAC based on the SHA-1 algorithm.
97 */
98 auth_hmacs->param_hdr.type = SCTP_PARAM_HMAC_ALGO;
99 auth_hmacs->param_hdr.length =
100 htons(sizeof(sctp_paramhdr_t) + 2);
101 auth_hmacs->hmac_ids[0] = htons(SCTP_AUTH_HMAC_ID_SHA1);
102
103 /* Initialize the CHUNKS parameter */
104 auth_chunks->param_hdr.type = SCTP_PARAM_CHUNKS;
Vlad Yasevich5e739d12008-08-21 03:34:25 -0700105 auth_chunks->param_hdr.length = htons(sizeof(sctp_paramhdr_t));
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700106
107 /* If the Add-IP functionality is enabled, we must
108 * authenticate, ASCONF and ASCONF-ACK chunks
109 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000110 if (net->sctp.addip_enable) {
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700111 auth_chunks->chunks[0] = SCTP_CID_ASCONF;
112 auth_chunks->chunks[1] = SCTP_CID_ASCONF_ACK;
Al Virocb0dc772009-03-18 19:12:42 -0700113 auth_chunks->param_hdr.length =
114 htons(sizeof(sctp_paramhdr_t) + 2);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700115 }
116 }
117
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 /* Initialize the base structure. */
119 /* What type of endpoint are we? */
120 ep->base.type = SCTP_EP_TYPE_SOCKET;
121
122 /* Initialize the basic object fields. */
123 atomic_set(&ep->base.refcnt, 1);
Daniel Borkmann0022d2d2013-04-15 03:27:18 +0000124 ep->base.dead = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 /* Create an input queue. */
127 sctp_inq_init(&ep->base.inqueue);
128
129 /* Set its top-half handler */
David Howellsc4028952006-11-22 14:57:56 +0000130 sctp_inq_set_th_handler(&ep->base.inqueue, sctp_endpoint_bh_rcv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
132 /* Initialize the bind addr area */
133 sctp_bind_addr_init(&ep->base.bind_addr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
135 /* Remember who we are attached to. */
136 ep->base.sk = sk;
137 sock_hold(ep->base.sk);
138
139 /* Create the lists of associations. */
140 INIT_LIST_HEAD(&ep->asocs);
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 /* Use SCTP specific send buffer space queues. */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000143 ep->sndbuf_policy = net->sctp.sndbuf_policy;
Neil Horman4d93df02007-08-15 16:07:44 -0700144
Wei Yongjun561b1732010-04-28 08:47:18 +0000145 sk->sk_data_ready = sctp_data_ready;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 sk->sk_write_space = sctp_write_space;
147 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
148
Neil Horman049b3ff2005-11-11 16:08:24 -0800149 /* Get the receive buffer policy for this endpoint */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000150 ep->rcvbuf_policy = net->sctp.rcvbuf_policy;
Neil Horman049b3ff2005-11-11 16:08:24 -0800151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 /* Initialize the secret key used with cookie. */
Daniel Borkmann570617e2013-02-12 05:15:33 +0000153 get_random_bytes(ep->secret_key, sizeof(ep->secret_key));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700155 /* SCTP-AUTH extensions*/
156 INIT_LIST_HEAD(&ep->endpoint_shared_keys);
Dan Carpenter81ce0db2013-02-28 19:27:43 +0000157 null_key = sctp_auth_shkey_create(0, gfp);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700158 if (!null_key)
159 goto nomem;
160
161 list_add(&null_key->key_list, &ep->endpoint_shared_keys);
162
Masanari Iida02582e92012-08-22 19:11:26 +0900163 /* Allocate and initialize transorms arrays for supported HMACs. */
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700164 err = sctp_auth_init_hmacs(ep, gfp);
165 if (err)
166 goto nomem_hmacs;
167
168 /* Add the null key to the endpoint shared keys list and
169 * set the hmcas and chunks pointers.
170 */
171 ep->auth_hmacs_list = auth_hmacs;
172 ep->auth_chunk_list = auth_chunks;
173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 return ep;
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700175
176nomem_hmacs:
177 sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
178nomem:
179 /* Free all allocations */
180 kfree(auth_hmacs);
181 kfree(auth_chunks);
182 kfree(ep->digest);
183 return NULL;
184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185}
186
187/* Create a sctp_endpoint with all that boring stuff initialized.
188 * Returns NULL if there isn't enough memory.
189 */
Al Virodd0fc662005-10-07 07:46:04 +0100190struct sctp_endpoint *sctp_endpoint_new(struct sock *sk, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
192 struct sctp_endpoint *ep;
193
194 /* Build a local endpoint. */
195 ep = t_new(struct sctp_endpoint, gfp);
196 if (!ep)
197 goto fail;
198 if (!sctp_endpoint_init(ep, sk, gfp))
199 goto fail_init;
Daniel Borkmannff2266c2013-04-15 03:27:17 +0000200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 SCTP_DBG_OBJCNT_INC(ep);
202 return ep;
203
204fail_init:
205 kfree(ep);
206fail:
207 return NULL;
208}
209
210/* Add an association to an endpoint. */
211void sctp_endpoint_add_asoc(struct sctp_endpoint *ep,
212 struct sctp_association *asoc)
213{
214 struct sock *sk = ep->base.sk;
215
Vlad Yasevichde76e692006-10-30 18:55:11 -0800216 /* If this is a temporary association, don't bother
217 * since we'll be removing it shortly and don't
218 * want anyone to find it anyway.
219 */
220 if (asoc->temp)
221 return;
222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 /* Now just add it to our list of asocs */
224 list_add_tail(&asoc->asocs, &ep->asocs);
225
226 /* Increment the backlog value for a TCP-style listening socket. */
227 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
228 sk->sk_ack_backlog++;
229}
230
231/* Free the endpoint structure. Delay cleanup until
232 * all users have released their reference count on this structure.
233 */
234void sctp_endpoint_free(struct sctp_endpoint *ep)
235{
Daniel Borkmann0022d2d2013-04-15 03:27:18 +0000236 ep->base.dead = true;
Vlad Yasevichcfdeef32006-07-21 14:48:26 -0700237
238 ep->base.sk->sk_state = SCTP_SS_CLOSED;
239
240 /* Unlink this endpoint, so we can't find it again! */
241 sctp_unhash_endpoint(ep);
242
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 sctp_endpoint_put(ep);
244}
245
246/* Final destructor for endpoint. */
247static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
248{
249 SCTP_ASSERT(ep->base.dead, "Endpoint is not dead", return);
250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 /* Free up the HMAC transform. */
Herbert Xu1b489e12006-08-20 15:07:14 +1000252 crypto_free_hash(sctp_sk(ep->base.sk)->hmac);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Vlad Yasevichb68dbca2006-11-09 16:29:57 -0800254 /* Free the digest buffer */
255 kfree(ep->digest);
256
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700257 /* SCTP-AUTH: Free up AUTH releated data such as shared keys
258 * chunks and hmacs arrays that were allocated
259 */
260 sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
261 kfree(ep->auth_hmacs_list);
262 kfree(ep->auth_chunk_list);
263
264 /* AUTH - Free any allocated HMAC transform containers */
265 sctp_auth_destroy_hmacs(ep->auth_hmacs);
266
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 /* Cleanup. */
268 sctp_inq_free(&ep->base.inqueue);
269 sctp_bind_addr_free(&ep->base.bind_addr);
270
Daniel Borkmann570617e2013-02-12 05:15:33 +0000271 memset(ep->secret_key, 0, sizeof(ep->secret_key));
Daniel Borkmannb5c37fe2013-02-08 03:04:35 +0000272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 /* Remove and free the port */
274 if (sctp_sk(ep->base.sk)->bind_hash)
275 sctp_put_port(ep->base.sk);
276
277 /* Give up our hold on the sock. */
278 if (ep->base.sk)
279 sock_put(ep->base.sk);
280
Daniel Borkmannff2266c2013-04-15 03:27:17 +0000281 kfree(ep);
282 SCTP_DBG_OBJCNT_DEC(ep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
285/* Hold a reference to an endpoint. */
286void sctp_endpoint_hold(struct sctp_endpoint *ep)
287{
288 atomic_inc(&ep->base.refcnt);
289}
290
291/* Release a reference to an endpoint and clean up if there are
292 * no more references.
293 */
294void sctp_endpoint_put(struct sctp_endpoint *ep)
295{
296 if (atomic_dec_and_test(&ep->base.refcnt))
297 sctp_endpoint_destroy(ep);
298}
299
300/* Is this the endpoint we are looking for? */
301struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
Eric W. Biederman4cdadcb2012-08-06 08:40:21 +0000302 struct net *net,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 const union sctp_addr *laddr)
304{
Vlad Yasevich559cf712007-09-16 16:03:28 -0700305 struct sctp_endpoint *retval = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Eric W. Biederman4cdadcb2012-08-06 08:40:21 +0000307 if ((htons(ep->base.bind_addr.port) == laddr->v4.sin_port) &&
308 net_eq(sock_net(ep->base.sk), net)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 if (sctp_bind_addr_match(&ep->base.bind_addr, laddr,
Vlad Yasevich559cf712007-09-16 16:03:28 -0700310 sctp_sk(ep->base.sk)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 retval = ep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 }
313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 return retval;
315}
316
317/* Find the association that goes with this chunk.
318 * We do a linear search of the associations for this endpoint.
319 * We return the matching transport address too.
320 */
321static struct sctp_association *__sctp_endpoint_lookup_assoc(
322 const struct sctp_endpoint *ep,
323 const union sctp_addr *paddr,
324 struct sctp_transport **transport)
325{
Vlad Yasevich123ed972007-11-09 11:41:36 -0500326 struct sctp_association *asoc = NULL;
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000327 struct sctp_association *tmp;
Vlad Yasevich123ed972007-11-09 11:41:36 -0500328 struct sctp_transport *t = NULL;
329 struct sctp_hashbucket *head;
330 struct sctp_ep_common *epb;
331 int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 int rport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
334 *transport = NULL;
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000335
336 /* If the local port is not set, there can't be any associations
337 * on this endpoint.
338 */
339 if (!ep->base.bind_addr.port)
340 goto out;
341
Vlad Yasevich123ed972007-11-09 11:41:36 -0500342 rport = ntohs(paddr->v4.sin_port);
343
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000344 hash = sctp_assoc_hashfn(sock_net(ep->base.sk), ep->base.bind_addr.port,
345 rport);
Vlad Yasevich123ed972007-11-09 11:41:36 -0500346 head = &sctp_assoc_hashtable[hash];
347 read_lock(&head->lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800348 sctp_for_each_hentry(epb, &head->chain) {
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000349 tmp = sctp_assoc(epb);
350 if (tmp->ep != ep || rport != tmp->peer.port)
351 continue;
Vlad Yasevich123ed972007-11-09 11:41:36 -0500352
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000353 t = sctp_assoc_lookup_paddr(tmp, paddr);
Vlad Yasevich123ed972007-11-09 11:41:36 -0500354 if (t) {
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000355 asoc = tmp;
Vlad Yasevich123ed972007-11-09 11:41:36 -0500356 *transport = t;
357 break;
358 }
Vlad Yasevich123ed972007-11-09 11:41:36 -0500359 }
360 read_unlock(&head->lock);
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000361out:
Vlad Yasevich123ed972007-11-09 11:41:36 -0500362 return asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363}
364
365/* Lookup association on an endpoint based on a peer address. BH-safe. */
366struct sctp_association *sctp_endpoint_lookup_assoc(
367 const struct sctp_endpoint *ep,
368 const union sctp_addr *paddr,
369 struct sctp_transport **transport)
370{
371 struct sctp_association *asoc;
372
373 sctp_local_bh_disable();
374 asoc = __sctp_endpoint_lookup_assoc(ep, paddr, transport);
375 sctp_local_bh_enable();
376
377 return asoc;
378}
379
380/* Look for any peeled off association from the endpoint that matches the
381 * given peer address.
382 */
383int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
384 const union sctp_addr *paddr)
385{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 struct sctp_sockaddr_entry *addr;
387 struct sctp_bind_addr *bp;
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000388 struct net *net = sock_net(ep->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 bp = &ep->base.bind_addr;
Vlad Yasevich559cf712007-09-16 16:03:28 -0700391 /* This function is called with the socket lock held,
392 * so the address_list can not change.
393 */
394 list_for_each_entry(addr, &bp->address_list, list) {
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000395 if (sctp_has_association(net, &addr->a, paddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
399 return 0;
400}
401
402/* Do delayed input processing. This is scheduled by sctp_rcv().
403 * This may be called on BH or task time.
404 */
David Howellsc4028952006-11-22 14:57:56 +0000405static void sctp_endpoint_bh_rcv(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406{
David Howellsc4028952006-11-22 14:57:56 +0000407 struct sctp_endpoint *ep =
408 container_of(work, struct sctp_endpoint,
409 base.inqueue.immediate);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 struct sctp_association *asoc;
411 struct sock *sk;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000412 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 struct sctp_transport *transport;
414 struct sctp_chunk *chunk;
415 struct sctp_inq *inqueue;
416 sctp_subtype_t subtype;
417 sctp_state_t state;
418 int error = 0;
Justin P. Mattock42b2aa82011-11-28 20:31:00 -0800419 int first_time = 1; /* is this the first time through the loop */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
421 if (ep->base.dead)
422 return;
423
424 asoc = NULL;
425 inqueue = &ep->base.inqueue;
426 sk = ep->base.sk;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000427 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
429 while (NULL != (chunk = sctp_inq_pop(inqueue))) {
430 subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);
431
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700432 /* If the first chunk in the packet is AUTH, do special
433 * processing specified in Section 6.3 of SCTP-AUTH spec
434 */
435 if (first_time && (subtype.chunk == SCTP_CID_AUTH)) {
436 struct sctp_chunkhdr *next_hdr;
437
438 next_hdr = sctp_inq_peek(inqueue);
439 if (!next_hdr)
440 goto normal;
441
442 /* If the next chunk is COOKIE-ECHO, skip the AUTH
443 * chunk while saving a pointer to it so we can do
444 * Authentication later (during cookie-echo
445 * processing).
446 */
447 if (next_hdr->type == SCTP_CID_COOKIE_ECHO) {
448 chunk->auth_chunk = skb_clone(chunk->skb,
449 GFP_ATOMIC);
450 chunk->auth = 1;
451 continue;
452 }
453 }
454normal:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 /* We might have grown an association since last we
456 * looked, so try again.
457 *
458 * This happens when we've just processed our
459 * COOKIE-ECHO chunk.
460 */
461 if (NULL == chunk->asoc) {
462 asoc = sctp_endpoint_lookup_assoc(ep,
463 sctp_source(chunk),
464 &transport);
465 chunk->asoc = asoc;
466 chunk->transport = transport;
467 }
468
469 state = asoc ? asoc->state : SCTP_STATE_CLOSED;
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700470 if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth)
471 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
473 /* Remember where the last DATA chunk came from so we
474 * know where to send the SACK.
475 */
476 if (asoc && sctp_chunk_is_data(chunk))
477 asoc->peer.last_data_from = chunk->transport;
Michele Baldessari196d6752012-12-01 04:49:42 +0000478 else {
Eric W. Biedermanb01a2402012-08-06 08:47:55 +0000479 SCTP_INC_STATS(sock_net(ep->base.sk), SCTP_MIB_INCTRLCHUNKS);
Michele Baldessari196d6752012-12-01 04:49:42 +0000480 if (asoc)
481 asoc->stats.ictrlchunks++;
482 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 if (chunk->transport)
485 chunk->transport->last_time_heard = jiffies;
486
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000487 error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, state,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900488 ep, asoc, chunk, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
490 if (error && chunk)
491 chunk->pdiscard = 1;
492
493 /* Check to see if the endpoint is freed in response to
494 * the incoming chunk. If so, get out of the while loop.
495 */
496 if (!sctp_sk(sk)->ep)
497 break;
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700498
499 if (first_time)
500 first_time = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 }
502}