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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
Jeff Kirsher4b2f13a2013-12-06 06:28:48 -080026 * along with GNU CC; see the file COPYING. If not, see
27 * <http://www.gnu.org/licenses/>.
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 *
29 * Please send any bug reports or fixes you make to the
30 * email address(es):
Daniel Borkmann91705c62013-07-23 14:51:47 +020031 * lksctp developers <linux-sctp@vger.kernel.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 * Written or modified by:
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Karl Knutson <karl@athena.chicago.il.us>
36 * Jon Grimm <jgrimm@austin.ibm.com>
37 * Daisy Chang <daisyc@us.ibm.com>
38 * Dajiang Zhang <dajiang.zhang@nokia.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 */
40
41#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/slab.h>
43#include <linux/in.h>
44#include <linux/random.h> /* get_random_bytes() */
45#include <linux/crypto.h>
46#include <net/sock.h>
47#include <net/ipv6.h>
48#include <net/sctp/sctp.h>
49#include <net/sctp/sm.h>
50
51/* Forward declarations for internal helpers. */
David Howellsc4028952006-11-22 14:57:56 +000052static void sctp_endpoint_bh_rcv(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54/*
55 * Initialize the base fields of the endpoint structure.
56 */
57static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -070058 struct sock *sk,
Al Virodd0fc662005-10-07 07:46:04 +010059 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +000061 struct net *net = sock_net(sk);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -070062 struct sctp_hmac_algo_param *auth_hmacs = NULL;
63 struct sctp_chunks_param *auth_chunks = NULL;
64 struct sctp_shared_key *null_key;
65 int err;
66
Vlad Yasevichb68dbca2006-11-09 16:29:57 -080067 ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp);
68 if (!ep->digest)
69 return NULL;
70
Vlad Yasevichb14878c2014-04-17 17:26:50 +020071 ep->auth_enable = net->sctp.auth_enable;
72 if (ep->auth_enable) {
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -070073 /* Allocate space for HMACS and CHUNKS authentication
74 * variables. There are arrays that we encode directly
75 * into parameters to make the rest of the operations easier.
76 */
77 auth_hmacs = kzalloc(sizeof(sctp_hmac_algo_param_t) +
78 sizeof(__u16) * SCTP_AUTH_NUM_HMACS, gfp);
79 if (!auth_hmacs)
80 goto nomem;
81
82 auth_chunks = kzalloc(sizeof(sctp_chunks_param_t) +
83 SCTP_NUM_CHUNK_TYPES, gfp);
84 if (!auth_chunks)
85 goto nomem;
86
87 /* Initialize the HMACS parameter.
88 * SCTP-AUTH: Section 3.3
89 * Every endpoint supporting SCTP chunk authentication MUST
90 * support the HMAC based on the SHA-1 algorithm.
91 */
92 auth_hmacs->param_hdr.type = SCTP_PARAM_HMAC_ALGO;
93 auth_hmacs->param_hdr.length =
94 htons(sizeof(sctp_paramhdr_t) + 2);
95 auth_hmacs->hmac_ids[0] = htons(SCTP_AUTH_HMAC_ID_SHA1);
96
97 /* Initialize the CHUNKS parameter */
98 auth_chunks->param_hdr.type = SCTP_PARAM_CHUNKS;
Vlad Yasevich5e739d12008-08-21 03:34:25 -070099 auth_chunks->param_hdr.length = htons(sizeof(sctp_paramhdr_t));
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700100
101 /* If the Add-IP functionality is enabled, we must
102 * authenticate, ASCONF and ASCONF-ACK chunks
103 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000104 if (net->sctp.addip_enable) {
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700105 auth_chunks->chunks[0] = SCTP_CID_ASCONF;
106 auth_chunks->chunks[1] = SCTP_CID_ASCONF_ACK;
Al Virocb0dc772009-03-18 19:12:42 -0700107 auth_chunks->param_hdr.length =
108 htons(sizeof(sctp_paramhdr_t) + 2);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700109 }
110 }
111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 /* Initialize the base structure. */
113 /* What type of endpoint are we? */
114 ep->base.type = SCTP_EP_TYPE_SOCKET;
115
116 /* Initialize the basic object fields. */
117 atomic_set(&ep->base.refcnt, 1);
Daniel Borkmann0022d2d2013-04-15 03:27:18 +0000118 ep->base.dead = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120 /* Create an input queue. */
121 sctp_inq_init(&ep->base.inqueue);
122
123 /* Set its top-half handler */
David Howellsc4028952006-11-22 14:57:56 +0000124 sctp_inq_set_th_handler(&ep->base.inqueue, sctp_endpoint_bh_rcv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 /* Initialize the bind addr area */
127 sctp_bind_addr_init(&ep->base.bind_addr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129 /* Remember who we are attached to. */
130 ep->base.sk = sk;
131 sock_hold(ep->base.sk);
132
133 /* Create the lists of associations. */
134 INIT_LIST_HEAD(&ep->asocs);
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 /* Use SCTP specific send buffer space queues. */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000137 ep->sndbuf_policy = net->sctp.sndbuf_policy;
Neil Horman4d93df02007-08-15 16:07:44 -0700138
Wei Yongjun561b1732010-04-28 08:47:18 +0000139 sk->sk_data_ready = sctp_data_ready;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 sk->sk_write_space = sctp_write_space;
141 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
142
Neil Horman049b3ff2005-11-11 16:08:24 -0800143 /* Get the receive buffer policy for this endpoint */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000144 ep->rcvbuf_policy = net->sctp.rcvbuf_policy;
Neil Horman049b3ff2005-11-11 16:08:24 -0800145
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 /* Initialize the secret key used with cookie. */
Daniel Borkmann570617e2013-02-12 05:15:33 +0000147 get_random_bytes(ep->secret_key, sizeof(ep->secret_key));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700149 /* SCTP-AUTH extensions*/
150 INIT_LIST_HEAD(&ep->endpoint_shared_keys);
Dan Carpenter81ce0db2013-02-28 19:27:43 +0000151 null_key = sctp_auth_shkey_create(0, gfp);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700152 if (!null_key)
153 goto nomem;
154
155 list_add(&null_key->key_list, &ep->endpoint_shared_keys);
156
Masanari Iida02582e92012-08-22 19:11:26 +0900157 /* Allocate and initialize transorms arrays for supported HMACs. */
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700158 err = sctp_auth_init_hmacs(ep, gfp);
159 if (err)
160 goto nomem_hmacs;
161
162 /* Add the null key to the endpoint shared keys list and
163 * set the hmcas and chunks pointers.
164 */
165 ep->auth_hmacs_list = auth_hmacs;
166 ep->auth_chunk_list = auth_chunks;
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 return ep;
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700169
170nomem_hmacs:
171 sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
172nomem:
173 /* Free all allocations */
174 kfree(auth_hmacs);
175 kfree(auth_chunks);
176 kfree(ep->digest);
177 return NULL;
178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179}
180
181/* Create a sctp_endpoint with all that boring stuff initialized.
182 * Returns NULL if there isn't enough memory.
183 */
Al Virodd0fc662005-10-07 07:46:04 +0100184struct sctp_endpoint *sctp_endpoint_new(struct sock *sk, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185{
186 struct sctp_endpoint *ep;
187
188 /* Build a local endpoint. */
Daniel Borkmann939cfa72013-06-17 11:40:04 +0200189 ep = kzalloc(sizeof(*ep), gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 if (!ep)
191 goto fail;
Daniel Borkmann939cfa72013-06-17 11:40:04 +0200192
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 if (!sctp_endpoint_init(ep, sk, gfp))
194 goto fail_init;
Daniel Borkmannff2266c2013-04-15 03:27:17 +0000195
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 SCTP_DBG_OBJCNT_INC(ep);
197 return ep;
198
199fail_init:
200 kfree(ep);
201fail:
202 return NULL;
203}
204
205/* Add an association to an endpoint. */
206void sctp_endpoint_add_asoc(struct sctp_endpoint *ep,
207 struct sctp_association *asoc)
208{
209 struct sock *sk = ep->base.sk;
210
Vlad Yasevichde76e692006-10-30 18:55:11 -0800211 /* If this is a temporary association, don't bother
212 * since we'll be removing it shortly and don't
213 * want anyone to find it anyway.
214 */
215 if (asoc->temp)
216 return;
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 /* Now just add it to our list of asocs */
219 list_add_tail(&asoc->asocs, &ep->asocs);
220
221 /* Increment the backlog value for a TCP-style listening socket. */
222 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
223 sk->sk_ack_backlog++;
224}
225
226/* Free the endpoint structure. Delay cleanup until
227 * all users have released their reference count on this structure.
228 */
229void sctp_endpoint_free(struct sctp_endpoint *ep)
230{
Daniel Borkmann0022d2d2013-04-15 03:27:18 +0000231 ep->base.dead = true;
Vlad Yasevichcfdeef32006-07-21 14:48:26 -0700232
233 ep->base.sk->sk_state = SCTP_SS_CLOSED;
234
235 /* Unlink this endpoint, so we can't find it again! */
236 sctp_unhash_endpoint(ep);
237
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 sctp_endpoint_put(ep);
239}
240
241/* Final destructor for endpoint. */
242static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
243{
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +0200244 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Daniel Borkmannbb333812013-06-28 19:49:40 +0200246 if (unlikely(!ep->base.dead)) {
247 WARN(1, "Attempt to destroy undead endpoint %p!\n", ep);
248 return;
249 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Vlad Yasevichb68dbca2006-11-09 16:29:57 -0800251 /* Free the digest buffer */
252 kfree(ep->digest);
253
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700254 /* SCTP-AUTH: Free up AUTH releated data such as shared keys
255 * chunks and hmacs arrays that were allocated
256 */
257 sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
258 kfree(ep->auth_hmacs_list);
259 kfree(ep->auth_chunk_list);
260
261 /* AUTH - Free any allocated HMAC transform containers */
262 sctp_auth_destroy_hmacs(ep->auth_hmacs);
263
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 /* Cleanup. */
265 sctp_inq_free(&ep->base.inqueue);
266 sctp_bind_addr_free(&ep->base.bind_addr);
267
Daniel Borkmann570617e2013-02-12 05:15:33 +0000268 memset(ep->secret_key, 0, sizeof(ep->secret_key));
Daniel Borkmannb5c37fe2013-02-08 03:04:35 +0000269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 /* Give up our hold on the sock. */
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +0200271 sk = ep->base.sk;
272 if (sk != NULL) {
273 /* Remove and free the port */
274 if (sctp_sk(sk)->bind_hash)
275 sctp_put_port(sk);
276
277 sock_put(sk);
278 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Daniel Borkmannff2266c2013-04-15 03:27:17 +0000280 kfree(ep);
281 SCTP_DBG_OBJCNT_DEC(ep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282}
283
284/* Hold a reference to an endpoint. */
285void sctp_endpoint_hold(struct sctp_endpoint *ep)
286{
287 atomic_inc(&ep->base.refcnt);
288}
289
290/* Release a reference to an endpoint and clean up if there are
291 * no more references.
292 */
293void sctp_endpoint_put(struct sctp_endpoint *ep)
294{
295 if (atomic_dec_and_test(&ep->base.refcnt))
296 sctp_endpoint_destroy(ep);
297}
298
299/* Is this the endpoint we are looking for? */
300struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
Eric W. Biederman4cdadcb2012-08-06 08:40:21 +0000301 struct net *net,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 const union sctp_addr *laddr)
303{
Vlad Yasevich559cf712007-09-16 16:03:28 -0700304 struct sctp_endpoint *retval = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Eric W. Biederman4cdadcb2012-08-06 08:40:21 +0000306 if ((htons(ep->base.bind_addr.port) == laddr->v4.sin_port) &&
307 net_eq(sock_net(ep->base.sk), net)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 if (sctp_bind_addr_match(&ep->base.bind_addr, laddr,
Vlad Yasevich559cf712007-09-16 16:03:28 -0700309 sctp_sk(ep->base.sk)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 retval = ep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 }
312
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 return retval;
314}
315
316/* Find the association that goes with this chunk.
317 * We do a linear search of the associations for this endpoint.
318 * We return the matching transport address too.
319 */
320static struct sctp_association *__sctp_endpoint_lookup_assoc(
321 const struct sctp_endpoint *ep,
322 const union sctp_addr *paddr,
323 struct sctp_transport **transport)
324{
Vlad Yasevich123ed972007-11-09 11:41:36 -0500325 struct sctp_association *asoc = NULL;
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000326 struct sctp_association *tmp;
Vlad Yasevich123ed972007-11-09 11:41:36 -0500327 struct sctp_transport *t = NULL;
328 struct sctp_hashbucket *head;
329 struct sctp_ep_common *epb;
330 int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 int rport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333 *transport = NULL;
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000334
335 /* If the local port is not set, there can't be any associations
336 * on this endpoint.
337 */
338 if (!ep->base.bind_addr.port)
339 goto out;
340
Vlad Yasevich123ed972007-11-09 11:41:36 -0500341 rport = ntohs(paddr->v4.sin_port);
342
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000343 hash = sctp_assoc_hashfn(sock_net(ep->base.sk), ep->base.bind_addr.port,
344 rport);
Vlad Yasevich123ed972007-11-09 11:41:36 -0500345 head = &sctp_assoc_hashtable[hash];
346 read_lock(&head->lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800347 sctp_for_each_hentry(epb, &head->chain) {
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000348 tmp = sctp_assoc(epb);
349 if (tmp->ep != ep || rport != tmp->peer.port)
350 continue;
Vlad Yasevich123ed972007-11-09 11:41:36 -0500351
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000352 t = sctp_assoc_lookup_paddr(tmp, paddr);
Vlad Yasevich123ed972007-11-09 11:41:36 -0500353 if (t) {
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000354 asoc = tmp;
Vlad Yasevich123ed972007-11-09 11:41:36 -0500355 *transport = t;
356 break;
357 }
Vlad Yasevich123ed972007-11-09 11:41:36 -0500358 }
359 read_unlock(&head->lock);
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000360out:
Vlad Yasevich123ed972007-11-09 11:41:36 -0500361 return asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362}
363
364/* Lookup association on an endpoint based on a peer address. BH-safe. */
365struct sctp_association *sctp_endpoint_lookup_assoc(
366 const struct sctp_endpoint *ep,
367 const union sctp_addr *paddr,
368 struct sctp_transport **transport)
369{
370 struct sctp_association *asoc;
371
wangweidong79b91132014-01-21 15:44:07 +0800372 local_bh_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 asoc = __sctp_endpoint_lookup_assoc(ep, paddr, transport);
wangweidong79b91132014-01-21 15:44:07 +0800374 local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
376 return asoc;
377}
378
379/* Look for any peeled off association from the endpoint that matches the
380 * given peer address.
381 */
382int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
383 const union sctp_addr *paddr)
384{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 struct sctp_sockaddr_entry *addr;
386 struct sctp_bind_addr *bp;
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000387 struct net *net = sock_net(ep->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 bp = &ep->base.bind_addr;
Vlad Yasevich559cf712007-09-16 16:03:28 -0700390 /* This function is called with the socket lock held,
391 * so the address_list can not change.
392 */
393 list_for_each_entry(addr, &bp->address_list, list) {
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000394 if (sctp_has_association(net, &addr->a, paddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
398 return 0;
399}
400
401/* Do delayed input processing. This is scheduled by sctp_rcv().
402 * This may be called on BH or task time.
403 */
David Howellsc4028952006-11-22 14:57:56 +0000404static void sctp_endpoint_bh_rcv(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405{
David Howellsc4028952006-11-22 14:57:56 +0000406 struct sctp_endpoint *ep =
407 container_of(work, struct sctp_endpoint,
408 base.inqueue.immediate);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 struct sctp_association *asoc;
410 struct sock *sk;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000411 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 struct sctp_transport *transport;
413 struct sctp_chunk *chunk;
414 struct sctp_inq *inqueue;
415 sctp_subtype_t subtype;
416 sctp_state_t state;
417 int error = 0;
Justin P. Mattock42b2aa82011-11-28 20:31:00 -0800418 int first_time = 1; /* is this the first time through the loop */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
420 if (ep->base.dead)
421 return;
422
423 asoc = NULL;
424 inqueue = &ep->base.inqueue;
425 sk = ep->base.sk;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000426 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
428 while (NULL != (chunk = sctp_inq_pop(inqueue))) {
429 subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);
430
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700431 /* If the first chunk in the packet is AUTH, do special
432 * processing specified in Section 6.3 of SCTP-AUTH spec
433 */
434 if (first_time && (subtype.chunk == SCTP_CID_AUTH)) {
435 struct sctp_chunkhdr *next_hdr;
436
437 next_hdr = sctp_inq_peek(inqueue);
438 if (!next_hdr)
439 goto normal;
440
441 /* If the next chunk is COOKIE-ECHO, skip the AUTH
442 * chunk while saving a pointer to it so we can do
443 * Authentication later (during cookie-echo
444 * processing).
445 */
446 if (next_hdr->type == SCTP_CID_COOKIE_ECHO) {
447 chunk->auth_chunk = skb_clone(chunk->skb,
448 GFP_ATOMIC);
449 chunk->auth = 1;
450 continue;
451 }
452 }
453normal:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 /* We might have grown an association since last we
455 * looked, so try again.
456 *
457 * This happens when we've just processed our
458 * COOKIE-ECHO chunk.
459 */
460 if (NULL == chunk->asoc) {
461 asoc = sctp_endpoint_lookup_assoc(ep,
462 sctp_source(chunk),
463 &transport);
464 chunk->asoc = asoc;
465 chunk->transport = transport;
466 }
467
468 state = asoc ? asoc->state : SCTP_STATE_CLOSED;
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700469 if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth)
470 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
472 /* Remember where the last DATA chunk came from so we
473 * know where to send the SACK.
474 */
475 if (asoc && sctp_chunk_is_data(chunk))
476 asoc->peer.last_data_from = chunk->transport;
Michele Baldessari196d6752012-12-01 04:49:42 +0000477 else {
Eric W. Biedermanb01a2402012-08-06 08:47:55 +0000478 SCTP_INC_STATS(sock_net(ep->base.sk), SCTP_MIB_INCTRLCHUNKS);
Michele Baldessari196d6752012-12-01 04:49:42 +0000479 if (asoc)
480 asoc->stats.ictrlchunks++;
481 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 if (chunk->transport)
484 chunk->transport->last_time_heard = jiffies;
485
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000486 error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, state,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900487 ep, asoc, chunk, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
489 if (error && chunk)
490 chunk->pdiscard = 1;
491
492 /* Check to see if the endpoint is freed in response to
493 * the incoming chunk. If so, get out of the while loop.
494 */
495 if (!sctp_sk(sk)->ep)
496 break;
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700497
498 if (first_time)
499 first_time = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 }
501}