blob: 1f03065686fee7ff433855bf9216736c6157fa60 [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
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() */
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <net/sock.h>
46#include <net/ipv6.h>
47#include <net/sctp/sctp.h>
48#include <net/sctp/sm.h>
49
50/* Forward declarations for internal helpers. */
David Howellsc4028952006-11-22 14:57:56 +000051static void sctp_endpoint_bh_rcv(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53/*
54 * Initialize the base fields of the endpoint structure.
55 */
56static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -070057 struct sock *sk,
Al Virodd0fc662005-10-07 07:46:04 +010058 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +000060 struct net *net = sock_net(sk);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -070061 struct sctp_hmac_algo_param *auth_hmacs = NULL;
62 struct sctp_chunks_param *auth_chunks = NULL;
63 struct sctp_shared_key *null_key;
64 int err;
65
Vlad Yasevichb68dbca2006-11-09 16:29:57 -080066 ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp);
67 if (!ep->digest)
68 return NULL;
69
Vlad Yasevichb14878c2014-04-17 17:26:50 +020070 ep->auth_enable = net->sctp.auth_enable;
71 if (ep->auth_enable) {
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -070072 /* Allocate space for HMACS and CHUNKS authentication
73 * variables. There are arrays that we encode directly
74 * into parameters to make the rest of the operations easier.
75 */
76 auth_hmacs = kzalloc(sizeof(sctp_hmac_algo_param_t) +
77 sizeof(__u16) * SCTP_AUTH_NUM_HMACS, gfp);
78 if (!auth_hmacs)
79 goto nomem;
80
81 auth_chunks = kzalloc(sizeof(sctp_chunks_param_t) +
82 SCTP_NUM_CHUNK_TYPES, gfp);
83 if (!auth_chunks)
84 goto nomem;
85
86 /* Initialize the HMACS parameter.
87 * SCTP-AUTH: Section 3.3
88 * Every endpoint supporting SCTP chunk authentication MUST
89 * support the HMAC based on the SHA-1 algorithm.
90 */
91 auth_hmacs->param_hdr.type = SCTP_PARAM_HMAC_ALGO;
92 auth_hmacs->param_hdr.length =
93 htons(sizeof(sctp_paramhdr_t) + 2);
94 auth_hmacs->hmac_ids[0] = htons(SCTP_AUTH_HMAC_ID_SHA1);
95
96 /* Initialize the CHUNKS parameter */
97 auth_chunks->param_hdr.type = SCTP_PARAM_CHUNKS;
Vlad Yasevich5e739d12008-08-21 03:34:25 -070098 auth_chunks->param_hdr.length = htons(sizeof(sctp_paramhdr_t));
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -070099
100 /* If the Add-IP functionality is enabled, we must
101 * authenticate, ASCONF and ASCONF-ACK chunks
102 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000103 if (net->sctp.addip_enable) {
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700104 auth_chunks->chunks[0] = SCTP_CID_ASCONF;
105 auth_chunks->chunks[1] = SCTP_CID_ASCONF_ACK;
Al Virocb0dc772009-03-18 19:12:42 -0700106 auth_chunks->param_hdr.length =
107 htons(sizeof(sctp_paramhdr_t) + 2);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700108 }
109 }
110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 /* Initialize the base structure. */
112 /* What type of endpoint are we? */
113 ep->base.type = SCTP_EP_TYPE_SOCKET;
114
115 /* Initialize the basic object fields. */
116 atomic_set(&ep->base.refcnt, 1);
Daniel Borkmann0022d2d2013-04-15 03:27:18 +0000117 ep->base.dead = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
119 /* Create an input queue. */
120 sctp_inq_init(&ep->base.inqueue);
121
122 /* Set its top-half handler */
David Howellsc4028952006-11-22 14:57:56 +0000123 sctp_inq_set_th_handler(&ep->base.inqueue, sctp_endpoint_bh_rcv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125 /* Initialize the bind addr area */
126 sctp_bind_addr_init(&ep->base.bind_addr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128 /* Remember who we are attached to. */
129 ep->base.sk = sk;
130 sock_hold(ep->base.sk);
131
132 /* Create the lists of associations. */
133 INIT_LIST_HEAD(&ep->asocs);
134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 /* Use SCTP specific send buffer space queues. */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000136 ep->sndbuf_policy = net->sctp.sndbuf_policy;
Neil Horman4d93df02007-08-15 16:07:44 -0700137
Wei Yongjun561b1732010-04-28 08:47:18 +0000138 sk->sk_data_ready = sctp_data_ready;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 sk->sk_write_space = sctp_write_space;
140 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
141
Neil Horman049b3ff2005-11-11 16:08:24 -0800142 /* Get the receive buffer policy for this endpoint */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000143 ep->rcvbuf_policy = net->sctp.rcvbuf_policy;
Neil Horman049b3ff2005-11-11 16:08:24 -0800144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 /* Initialize the secret key used with cookie. */
Daniel Borkmann570617e2013-02-12 05:15:33 +0000146 get_random_bytes(ep->secret_key, sizeof(ep->secret_key));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700148 /* SCTP-AUTH extensions*/
149 INIT_LIST_HEAD(&ep->endpoint_shared_keys);
Dan Carpenter81ce0db2013-02-28 19:27:43 +0000150 null_key = sctp_auth_shkey_create(0, gfp);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700151 if (!null_key)
152 goto nomem;
153
154 list_add(&null_key->key_list, &ep->endpoint_shared_keys);
155
Masanari Iida02582e92012-08-22 19:11:26 +0900156 /* Allocate and initialize transorms arrays for supported HMACs. */
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700157 err = sctp_auth_init_hmacs(ep, gfp);
158 if (err)
159 goto nomem_hmacs;
160
161 /* Add the null key to the endpoint shared keys list and
162 * set the hmcas and chunks pointers.
163 */
164 ep->auth_hmacs_list = auth_hmacs;
165 ep->auth_chunk_list = auth_chunks;
Xin Long28aa4c22016-07-09 19:47:40 +0800166 ep->prsctp_enable = net->sctp.prsctp_enable;
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700167
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.
Xin Long4f008782015-12-30 23:50:47 +0800317 * We lookup the transport from hashtable at first, then get association
318 * through t->assoc.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 */
Xin Longc79c0662015-12-30 23:50:50 +0800320struct sctp_association *sctp_endpoint_lookup_assoc(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 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;
Xin Long4f008782015-12-30 23:50:47 +0800326 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328 *transport = NULL;
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000329
330 /* If the local port is not set, there can't be any associations
331 * on this endpoint.
332 */
333 if (!ep->base.bind_addr.port)
334 goto out;
Xin Long4f008782015-12-30 23:50:47 +0800335 t = sctp_epaddr_lookup_transport(ep, paddr);
Xin Longdd7445a2016-01-16 20:17:17 +0800336 if (!t)
Xin Long4f008782015-12-30 23:50:47 +0800337 goto out;
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000338
Xin Long4f008782015-12-30 23:50:47 +0800339 *transport = t;
340 asoc = t->asoc;
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000341out:
Vlad Yasevich123ed972007-11-09 11:41:36 -0500342 return asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343}
344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345/* Look for any peeled off association from the endpoint that matches the
346 * given peer address.
347 */
348int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
349 const union sctp_addr *paddr)
350{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 struct sctp_sockaddr_entry *addr;
352 struct sctp_bind_addr *bp;
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000353 struct net *net = sock_net(ep->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 bp = &ep->base.bind_addr;
Vlad Yasevich559cf712007-09-16 16:03:28 -0700356 /* This function is called with the socket lock held,
357 * so the address_list can not change.
358 */
359 list_for_each_entry(addr, &bp->address_list, list) {
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000360 if (sctp_has_association(net, &addr->a, paddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
364 return 0;
365}
366
367/* Do delayed input processing. This is scheduled by sctp_rcv().
368 * This may be called on BH or task time.
369 */
David Howellsc4028952006-11-22 14:57:56 +0000370static void sctp_endpoint_bh_rcv(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
David Howellsc4028952006-11-22 14:57:56 +0000372 struct sctp_endpoint *ep =
373 container_of(work, struct sctp_endpoint,
374 base.inqueue.immediate);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 struct sctp_association *asoc;
376 struct sock *sk;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000377 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 struct sctp_transport *transport;
379 struct sctp_chunk *chunk;
380 struct sctp_inq *inqueue;
381 sctp_subtype_t subtype;
382 sctp_state_t state;
383 int error = 0;
Justin P. Mattock42b2aa82011-11-28 20:31:00 -0800384 int first_time = 1; /* is this the first time through the loop */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
386 if (ep->base.dead)
387 return;
388
389 asoc = NULL;
390 inqueue = &ep->base.inqueue;
391 sk = ep->base.sk;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000392 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
394 while (NULL != (chunk = sctp_inq_pop(inqueue))) {
395 subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);
396
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700397 /* If the first chunk in the packet is AUTH, do special
398 * processing specified in Section 6.3 of SCTP-AUTH spec
399 */
400 if (first_time && (subtype.chunk == SCTP_CID_AUTH)) {
401 struct sctp_chunkhdr *next_hdr;
402
403 next_hdr = sctp_inq_peek(inqueue);
404 if (!next_hdr)
405 goto normal;
406
407 /* If the next chunk is COOKIE-ECHO, skip the AUTH
408 * chunk while saving a pointer to it so we can do
409 * Authentication later (during cookie-echo
410 * processing).
411 */
412 if (next_hdr->type == SCTP_CID_COOKIE_ECHO) {
413 chunk->auth_chunk = skb_clone(chunk->skb,
414 GFP_ATOMIC);
415 chunk->auth = 1;
416 continue;
417 }
418 }
419normal:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 /* We might have grown an association since last we
421 * looked, so try again.
422 *
423 * This happens when we've just processed our
424 * COOKIE-ECHO chunk.
425 */
426 if (NULL == chunk->asoc) {
427 asoc = sctp_endpoint_lookup_assoc(ep,
428 sctp_source(chunk),
429 &transport);
430 chunk->asoc = asoc;
431 chunk->transport = transport;
432 }
433
434 state = asoc ? asoc->state : SCTP_STATE_CLOSED;
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700435 if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth)
436 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
438 /* Remember where the last DATA chunk came from so we
439 * know where to send the SACK.
440 */
441 if (asoc && sctp_chunk_is_data(chunk))
442 asoc->peer.last_data_from = chunk->transport;
Michele Baldessari196d6752012-12-01 04:49:42 +0000443 else {
Eric W. Biedermanb01a2402012-08-06 08:47:55 +0000444 SCTP_INC_STATS(sock_net(ep->base.sk), SCTP_MIB_INCTRLCHUNKS);
Michele Baldessari196d6752012-12-01 04:49:42 +0000445 if (asoc)
446 asoc->stats.ictrlchunks++;
447 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
449 if (chunk->transport)
Daniel Borkmanne575235f2014-06-11 18:19:30 +0200450 chunk->transport->last_time_heard = ktime_get();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000452 error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, state,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900453 ep, asoc, chunk, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
455 if (error && chunk)
456 chunk->pdiscard = 1;
457
458 /* Check to see if the endpoint is freed in response to
459 * the incoming chunk. If so, get out of the while loop.
460 */
461 if (!sctp_sk(sk)->ep)
462 break;
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700463
464 if (first_time)
465 first_time = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 }
467}