blob: 1859e2bc83d113d1a14d01f904475b01099e0626 [file] [log] [blame]
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);
124 ep->base.dead = 0;
125 ep->base.malloced = 1;
126
127 /* Create an input queue. */
128 sctp_inq_init(&ep->base.inqueue);
129
130 /* Set its top-half handler */
David Howellsc4028952006-11-22 14:57:56 +0000131 sctp_inq_set_th_handler(&ep->base.inqueue, sctp_endpoint_bh_rcv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133 /* Initialize the bind addr area */
134 sctp_bind_addr_init(&ep->base.bind_addr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
136 /* Remember who we are attached to. */
137 ep->base.sk = sk;
138 sock_hold(ep->base.sk);
139
140 /* Create the lists of associations. */
141 INIT_LIST_HEAD(&ep->asocs);
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 /* Use SCTP specific send buffer space queues. */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000144 ep->sndbuf_policy = net->sctp.sndbuf_policy;
Neil Horman4d93df02007-08-15 16:07:44 -0700145
Wei Yongjun561b1732010-04-28 08:47:18 +0000146 sk->sk_data_ready = sctp_data_ready;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 sk->sk_write_space = sctp_write_space;
148 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
149
Neil Horman049b3ff2005-11-11 16:08:24 -0800150 /* Get the receive buffer policy for this endpoint */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000151 ep->rcvbuf_policy = net->sctp.rcvbuf_policy;
Neil Horman049b3ff2005-11-11 16:08:24 -0800152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 /* Initialize the secret key used with cookie. */
154 get_random_bytes(&ep->secret_key[0], SCTP_SECRET_SIZE);
155 ep->last_key = ep->current_key = 0;
156 ep->key_changed_at = jiffies;
157
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700158 /* SCTP-AUTH extensions*/
159 INIT_LIST_HEAD(&ep->endpoint_shared_keys);
160 null_key = sctp_auth_shkey_create(0, GFP_KERNEL);
161 if (!null_key)
162 goto nomem;
163
164 list_add(&null_key->key_list, &ep->endpoint_shared_keys);
165
166 /* Allocate and initialize transorms arrays for suported HMACs. */
167 err = sctp_auth_init_hmacs(ep, gfp);
168 if (err)
169 goto nomem_hmacs;
170
171 /* Add the null key to the endpoint shared keys list and
172 * set the hmcas and chunks pointers.
173 */
174 ep->auth_hmacs_list = auth_hmacs;
175 ep->auth_chunk_list = auth_chunks;
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 return ep;
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700178
179nomem_hmacs:
180 sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
181nomem:
182 /* Free all allocations */
183 kfree(auth_hmacs);
184 kfree(auth_chunks);
185 kfree(ep->digest);
186 return NULL;
187
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188}
189
190/* Create a sctp_endpoint with all that boring stuff initialized.
191 * Returns NULL if there isn't enough memory.
192 */
Al Virodd0fc662005-10-07 07:46:04 +0100193struct sctp_endpoint *sctp_endpoint_new(struct sock *sk, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194{
195 struct sctp_endpoint *ep;
196
197 /* Build a local endpoint. */
198 ep = t_new(struct sctp_endpoint, gfp);
199 if (!ep)
200 goto fail;
201 if (!sctp_endpoint_init(ep, sk, gfp))
202 goto fail_init;
203 ep->base.malloced = 1;
204 SCTP_DBG_OBJCNT_INC(ep);
205 return ep;
206
207fail_init:
208 kfree(ep);
209fail:
210 return NULL;
211}
212
213/* Add an association to an endpoint. */
214void sctp_endpoint_add_asoc(struct sctp_endpoint *ep,
215 struct sctp_association *asoc)
216{
217 struct sock *sk = ep->base.sk;
218
Vlad Yasevichde76e692006-10-30 18:55:11 -0800219 /* If this is a temporary association, don't bother
220 * since we'll be removing it shortly and don't
221 * want anyone to find it anyway.
222 */
223 if (asoc->temp)
224 return;
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 /* Now just add it to our list of asocs */
227 list_add_tail(&asoc->asocs, &ep->asocs);
228
229 /* Increment the backlog value for a TCP-style listening socket. */
230 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
231 sk->sk_ack_backlog++;
232}
233
234/* Free the endpoint structure. Delay cleanup until
235 * all users have released their reference count on this structure.
236 */
237void sctp_endpoint_free(struct sctp_endpoint *ep)
238{
239 ep->base.dead = 1;
Vlad Yasevichcfdeef32006-07-21 14:48:26 -0700240
241 ep->base.sk->sk_state = SCTP_SS_CLOSED;
242
243 /* Unlink this endpoint, so we can't find it again! */
244 sctp_unhash_endpoint(ep);
245
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 sctp_endpoint_put(ep);
247}
248
249/* Final destructor for endpoint. */
250static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
251{
252 SCTP_ASSERT(ep->base.dead, "Endpoint is not dead", return);
253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 /* Free up the HMAC transform. */
Herbert Xu1b489e12006-08-20 15:07:14 +1000255 crypto_free_hash(sctp_sk(ep->base.sk)->hmac);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Vlad Yasevichb68dbca2006-11-09 16:29:57 -0800257 /* Free the digest buffer */
258 kfree(ep->digest);
259
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700260 /* SCTP-AUTH: Free up AUTH releated data such as shared keys
261 * chunks and hmacs arrays that were allocated
262 */
263 sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
264 kfree(ep->auth_hmacs_list);
265 kfree(ep->auth_chunk_list);
266
267 /* AUTH - Free any allocated HMAC transform containers */
268 sctp_auth_destroy_hmacs(ep->auth_hmacs);
269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 /* Cleanup. */
271 sctp_inq_free(&ep->base.inqueue);
272 sctp_bind_addr_free(&ep->base.bind_addr);
273
274 /* Remove and free the port */
275 if (sctp_sk(ep->base.sk)->bind_hash)
276 sctp_put_port(ep->base.sk);
277
278 /* Give up our hold on the sock. */
279 if (ep->base.sk)
280 sock_put(ep->base.sk);
281
282 /* Finally, free up our memory. */
283 if (ep->base.malloced) {
284 kfree(ep);
285 SCTP_DBG_OBJCNT_DEC(ep);
286 }
287}
288
289/* Hold a reference to an endpoint. */
290void sctp_endpoint_hold(struct sctp_endpoint *ep)
291{
292 atomic_inc(&ep->base.refcnt);
293}
294
295/* Release a reference to an endpoint and clean up if there are
296 * no more references.
297 */
298void sctp_endpoint_put(struct sctp_endpoint *ep)
299{
300 if (atomic_dec_and_test(&ep->base.refcnt))
301 sctp_endpoint_destroy(ep);
302}
303
304/* Is this the endpoint we are looking for? */
305struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
Eric W. Biederman4cdadcb2012-08-06 08:40:21 +0000306 struct net *net,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 const union sctp_addr *laddr)
308{
Vlad Yasevich559cf712007-09-16 16:03:28 -0700309 struct sctp_endpoint *retval = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Eric W. Biederman4cdadcb2012-08-06 08:40:21 +0000311 if ((htons(ep->base.bind_addr.port) == laddr->v4.sin_port) &&
312 net_eq(sock_net(ep->base.sk), net)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 if (sctp_bind_addr_match(&ep->base.bind_addr, laddr,
Vlad Yasevich559cf712007-09-16 16:03:28 -0700314 sctp_sk(ep->base.sk)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 retval = ep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 }
317
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 return retval;
319}
320
321/* Find the association that goes with this chunk.
322 * We do a linear search of the associations for this endpoint.
323 * We return the matching transport address too.
324 */
325static struct sctp_association *__sctp_endpoint_lookup_assoc(
326 const struct sctp_endpoint *ep,
327 const union sctp_addr *paddr,
328 struct sctp_transport **transport)
329{
Vlad Yasevich123ed972007-11-09 11:41:36 -0500330 struct sctp_association *asoc = NULL;
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000331 struct sctp_association *tmp;
Vlad Yasevich123ed972007-11-09 11:41:36 -0500332 struct sctp_transport *t = NULL;
333 struct sctp_hashbucket *head;
334 struct sctp_ep_common *epb;
Vlad Yasevichd970dbf2007-11-09 11:43:40 -0500335 struct hlist_node *node;
Vlad Yasevich123ed972007-11-09 11:41:36 -0500336 int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 int rport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339 *transport = NULL;
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000340
341 /* If the local port is not set, there can't be any associations
342 * on this endpoint.
343 */
344 if (!ep->base.bind_addr.port)
345 goto out;
346
Vlad Yasevich123ed972007-11-09 11:41:36 -0500347 rport = ntohs(paddr->v4.sin_port);
348
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000349 hash = sctp_assoc_hashfn(sock_net(ep->base.sk), ep->base.bind_addr.port,
350 rport);
Vlad Yasevich123ed972007-11-09 11:41:36 -0500351 head = &sctp_assoc_hashtable[hash];
352 read_lock(&head->lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -0500353 sctp_for_each_hentry(epb, node, &head->chain) {
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000354 tmp = sctp_assoc(epb);
355 if (tmp->ep != ep || rport != tmp->peer.port)
356 continue;
Vlad Yasevich123ed972007-11-09 11:41:36 -0500357
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000358 t = sctp_assoc_lookup_paddr(tmp, paddr);
Vlad Yasevich123ed972007-11-09 11:41:36 -0500359 if (t) {
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000360 asoc = tmp;
Vlad Yasevich123ed972007-11-09 11:41:36 -0500361 *transport = t;
362 break;
363 }
Vlad Yasevich123ed972007-11-09 11:41:36 -0500364 }
365 read_unlock(&head->lock);
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000366out:
Vlad Yasevich123ed972007-11-09 11:41:36 -0500367 return asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368}
369
370/* Lookup association on an endpoint based on a peer address. BH-safe. */
371struct sctp_association *sctp_endpoint_lookup_assoc(
372 const struct sctp_endpoint *ep,
373 const union sctp_addr *paddr,
374 struct sctp_transport **transport)
375{
376 struct sctp_association *asoc;
377
378 sctp_local_bh_disable();
379 asoc = __sctp_endpoint_lookup_assoc(ep, paddr, transport);
380 sctp_local_bh_enable();
381
382 return asoc;
383}
384
385/* Look for any peeled off association from the endpoint that matches the
386 * given peer address.
387 */
388int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
389 const union sctp_addr *paddr)
390{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 struct sctp_sockaddr_entry *addr;
392 struct sctp_bind_addr *bp;
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000393 struct net *net = sock_net(ep->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 bp = &ep->base.bind_addr;
Vlad Yasevich559cf712007-09-16 16:03:28 -0700396 /* This function is called with the socket lock held,
397 * so the address_list can not change.
398 */
399 list_for_each_entry(addr, &bp->address_list, list) {
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000400 if (sctp_has_association(net, &addr->a, paddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
404 return 0;
405}
406
407/* Do delayed input processing. This is scheduled by sctp_rcv().
408 * This may be called on BH or task time.
409 */
David Howellsc4028952006-11-22 14:57:56 +0000410static void sctp_endpoint_bh_rcv(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411{
David Howellsc4028952006-11-22 14:57:56 +0000412 struct sctp_endpoint *ep =
413 container_of(work, struct sctp_endpoint,
414 base.inqueue.immediate);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 struct sctp_association *asoc;
416 struct sock *sk;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000417 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 struct sctp_transport *transport;
419 struct sctp_chunk *chunk;
420 struct sctp_inq *inqueue;
421 sctp_subtype_t subtype;
422 sctp_state_t state;
423 int error = 0;
Justin P. Mattock42b2aa82011-11-28 20:31:00 -0800424 int first_time = 1; /* is this the first time through the loop */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
426 if (ep->base.dead)
427 return;
428
429 asoc = NULL;
430 inqueue = &ep->base.inqueue;
431 sk = ep->base.sk;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000432 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434 while (NULL != (chunk = sctp_inq_pop(inqueue))) {
435 subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);
436
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700437 /* If the first chunk in the packet is AUTH, do special
438 * processing specified in Section 6.3 of SCTP-AUTH spec
439 */
440 if (first_time && (subtype.chunk == SCTP_CID_AUTH)) {
441 struct sctp_chunkhdr *next_hdr;
442
443 next_hdr = sctp_inq_peek(inqueue);
444 if (!next_hdr)
445 goto normal;
446
447 /* If the next chunk is COOKIE-ECHO, skip the AUTH
448 * chunk while saving a pointer to it so we can do
449 * Authentication later (during cookie-echo
450 * processing).
451 */
452 if (next_hdr->type == SCTP_CID_COOKIE_ECHO) {
453 chunk->auth_chunk = skb_clone(chunk->skb,
454 GFP_ATOMIC);
455 chunk->auth = 1;
456 continue;
457 }
458 }
459normal:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 /* We might have grown an association since last we
461 * looked, so try again.
462 *
463 * This happens when we've just processed our
464 * COOKIE-ECHO chunk.
465 */
466 if (NULL == chunk->asoc) {
467 asoc = sctp_endpoint_lookup_assoc(ep,
468 sctp_source(chunk),
469 &transport);
470 chunk->asoc = asoc;
471 chunk->transport = transport;
472 }
473
474 state = asoc ? asoc->state : SCTP_STATE_CLOSED;
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700475 if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth)
476 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
478 /* Remember where the last DATA chunk came from so we
479 * know where to send the SACK.
480 */
481 if (asoc && sctp_chunk_is_data(chunk))
482 asoc->peer.last_data_from = chunk->transport;
483 else
Eric W. Biedermanb01a2402012-08-06 08:47:55 +0000484 SCTP_INC_STATS(sock_net(ep->base.sk), SCTP_MIB_INCTRLCHUNKS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 if (chunk->transport)
487 chunk->transport->last_time_heard = jiffies;
488
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000489 error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, state,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900490 ep, asoc, chunk, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
492 if (error && chunk)
493 chunk->pdiscard = 1;
494
495 /* Check to see if the endpoint is freed in response to
496 * the incoming chunk. If so, get out of the while loop.
497 */
498 if (!sctp_sk(sk)->ep)
499 break;
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700500
501 if (first_time)
502 first_time = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 }
504}