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Thomas Gleixner8e8caf92019-05-23 11:14:40 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Vlad Yasevich60c778b2008-01-11 09:57:09 -05002/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2002 International Business Machines, Corp.
6 * Copyright (c) 2001 Intel Corp.
7 * Copyright (c) 2001 Nokia, Inc.
8 * Copyright (c) 2001 La Monte H.P. Yarroll
9 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050010 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
12 * This abstraction represents an SCTP endpoint.
13 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * Please send any bug reports or fixes you make to the
15 * email address(es):
Daniel Borkmann91705c62013-07-23 14:51:47 +020016 * lksctp developers <linux-sctp@vger.kernel.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 * Written or modified by:
19 * La Monte H.P. Yarroll <piggy@acm.org>
20 * Karl Knutson <karl@athena.chicago.il.us>
21 * Jon Grimm <jgrimm@austin.ibm.com>
22 * Daisy Chang <daisyc@us.ibm.com>
23 * Dajiang Zhang <dajiang.zhang@nokia.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 */
25
26#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/slab.h>
28#include <linux/in.h>
29#include <linux/random.h> /* get_random_bytes() */
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <net/sock.h>
31#include <net/ipv6.h>
32#include <net/sctp/sctp.h>
33#include <net/sctp/sm.h>
34
35/* Forward declarations for internal helpers. */
David Howellsc4028952006-11-22 14:57:56 +000036static void sctp_endpoint_bh_rcv(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38/*
39 * Initialize the base fields of the endpoint structure.
40 */
41static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
Alexey Dobriyan3182cd82005-07-11 20:57:47 -070042 struct sock *sk,
Al Virodd0fc662005-10-07 07:46:04 +010043 gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +000045 struct net *net = sock_net(sk);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -070046 struct sctp_shared_key *null_key;
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -070047
Vlad Yasevichb68dbca2006-11-09 16:29:57 -080048 ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp);
49 if (!ep->digest)
50 return NULL;
51
Xin Long4e274282019-08-19 22:02:43 +080052 ep->asconf_enable = net->sctp.addip_enable;
Vlad Yasevichb14878c2014-04-17 17:26:50 +020053 ep->auth_enable = net->sctp.auth_enable;
54 if (ep->auth_enable) {
Xin Long03f96122019-08-19 22:02:48 +080055 if (sctp_auth_init(ep, gfp))
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -070056 goto nomem;
Xin Long4e274282019-08-19 22:02:43 +080057 if (ep->asconf_enable) {
Xin Long03f96122019-08-19 22:02:48 +080058 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
59 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -070060 }
61 }
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 /* Initialize the base structure. */
64 /* What type of endpoint are we? */
65 ep->base.type = SCTP_EP_TYPE_SOCKET;
66
67 /* Initialize the basic object fields. */
Reshetova, Elenac6384572017-07-04 15:53:28 +030068 refcount_set(&ep->base.refcnt, 1);
Daniel Borkmann0022d2d2013-04-15 03:27:18 +000069 ep->base.dead = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71 /* Create an input queue. */
72 sctp_inq_init(&ep->base.inqueue);
73
74 /* Set its top-half handler */
David Howellsc4028952006-11-22 14:57:56 +000075 sctp_inq_set_th_handler(&ep->base.inqueue, sctp_endpoint_bh_rcv);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77 /* Initialize the bind addr area */
78 sctp_bind_addr_init(&ep->base.bind_addr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 /* Create the lists of associations. */
81 INIT_LIST_HEAD(&ep->asocs);
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 /* Use SCTP specific send buffer space queues. */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +000084 ep->sndbuf_policy = net->sctp.sndbuf_policy;
Neil Horman4d93df02007-08-15 16:07:44 -070085
Wei Yongjun561b1732010-04-28 08:47:18 +000086 sk->sk_data_ready = sctp_data_ready;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 sk->sk_write_space = sctp_write_space;
88 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
89
Neil Horman049b3ff2005-11-11 16:08:24 -080090 /* Get the receive buffer policy for this endpoint */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +000091 ep->rcvbuf_policy = net->sctp.rcvbuf_policy;
Neil Horman049b3ff2005-11-11 16:08:24 -080092
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 /* Initialize the secret key used with cookie. */
Daniel Borkmann570617e2013-02-12 05:15:33 +000094 get_random_bytes(ep->secret_key, sizeof(ep->secret_key));
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -070096 /* SCTP-AUTH extensions*/
97 INIT_LIST_HEAD(&ep->endpoint_shared_keys);
Dan Carpenter81ce0db2013-02-28 19:27:43 +000098 null_key = sctp_auth_shkey_create(0, gfp);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -070099 if (!null_key)
Xin Long60208f72019-03-03 17:54:54 +0800100 goto nomem_shkey;
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700101
102 list_add(&null_key->key_list, &ep->endpoint_shared_keys);
103
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700104 /* Add the null key to the endpoint shared keys list and
105 * set the hmcas and chunks pointers.
106 */
Xin Long28aa4c22016-07-09 19:47:40 +0800107 ep->prsctp_enable = net->sctp.prsctp_enable;
Xin Longc28445c2017-01-18 00:44:45 +0800108 ep->reconf_enable = net->sctp.reconf_enable;
Xin Long1b0b8112019-08-26 16:30:02 +0800109 ep->ecn_enable = net->sctp.ecn_enable;
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700110
Xin Long25bff6d2019-06-25 00:21:45 +0800111 /* Remember who we are attached to. */
112 ep->base.sk = sk;
113 sock_hold(ep->base.sk);
114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 return ep;
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700116
Xin Long60208f72019-03-03 17:54:54 +0800117nomem_shkey:
Xin Long03f96122019-08-19 22:02:48 +0800118 sctp_auth_free(ep);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700119nomem:
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700120 kfree(ep->digest);
121 return NULL;
122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123}
124
125/* Create a sctp_endpoint with all that boring stuff initialized.
126 * Returns NULL if there isn't enough memory.
127 */
Al Virodd0fc662005-10-07 07:46:04 +0100128struct sctp_endpoint *sctp_endpoint_new(struct sock *sk, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129{
130 struct sctp_endpoint *ep;
131
132 /* Build a local endpoint. */
Daniel Borkmann939cfa72013-06-17 11:40:04 +0200133 ep = kzalloc(sizeof(*ep), gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 if (!ep)
135 goto fail;
Daniel Borkmann939cfa72013-06-17 11:40:04 +0200136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 if (!sctp_endpoint_init(ep, sk, gfp))
138 goto fail_init;
Daniel Borkmannff2266c2013-04-15 03:27:17 +0000139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 SCTP_DBG_OBJCNT_INC(ep);
141 return ep;
142
143fail_init:
144 kfree(ep);
145fail:
146 return NULL;
147}
148
149/* Add an association to an endpoint. */
150void sctp_endpoint_add_asoc(struct sctp_endpoint *ep,
151 struct sctp_association *asoc)
152{
153 struct sock *sk = ep->base.sk;
154
Vlad Yasevichde76e692006-10-30 18:55:11 -0800155 /* If this is a temporary association, don't bother
156 * since we'll be removing it shortly and don't
157 * want anyone to find it anyway.
158 */
159 if (asoc->temp)
160 return;
161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 /* Now just add it to our list of asocs */
163 list_add_tail(&asoc->asocs, &ep->asocs);
164
165 /* Increment the backlog value for a TCP-style listening socket. */
166 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
167 sk->sk_ack_backlog++;
168}
169
170/* Free the endpoint structure. Delay cleanup until
171 * all users have released their reference count on this structure.
172 */
173void sctp_endpoint_free(struct sctp_endpoint *ep)
174{
Daniel Borkmann0022d2d2013-04-15 03:27:18 +0000175 ep->base.dead = true;
Vlad Yasevichcfdeef32006-07-21 14:48:26 -0700176
Yafang Shaocbabf462017-12-20 11:12:54 +0800177 inet_sk_set_state(ep->base.sk, SCTP_SS_CLOSED);
Vlad Yasevichcfdeef32006-07-21 14:48:26 -0700178
179 /* Unlink this endpoint, so we can't find it again! */
180 sctp_unhash_endpoint(ep);
181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 sctp_endpoint_put(ep);
183}
184
185/* Final destructor for endpoint. */
186static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
187{
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +0200188 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Daniel Borkmannbb333812013-06-28 19:49:40 +0200190 if (unlikely(!ep->base.dead)) {
191 WARN(1, "Attempt to destroy undead endpoint %p!\n", ep);
192 return;
193 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Vlad Yasevichb68dbca2006-11-09 16:29:57 -0800195 /* Free the digest buffer */
196 kfree(ep->digest);
197
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700198 /* SCTP-AUTH: Free up AUTH releated data such as shared keys
199 * chunks and hmacs arrays that were allocated
200 */
201 sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
Xin Long03f96122019-08-19 22:02:48 +0800202 sctp_auth_free(ep);
Vlad Yasevicha29a5bd2007-09-16 19:31:35 -0700203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 /* Cleanup. */
205 sctp_inq_free(&ep->base.inqueue);
206 sctp_bind_addr_free(&ep->base.bind_addr);
207
Daniel Borkmann570617e2013-02-12 05:15:33 +0000208 memset(ep->secret_key, 0, sizeof(ep->secret_key));
Daniel Borkmannb5c37fe2013-02-08 03:04:35 +0000209
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +0200210 sk = ep->base.sk;
Xin Long7f304b92017-06-29 17:28:06 +0800211 /* Remove and free the port */
212 if (sctp_sk(sk)->bind_hash)
213 sctp_put_port(sk);
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +0200214
Xin Long7f304b92017-06-29 17:28:06 +0800215 sctp_sk(sk)->ep = NULL;
216 /* Give up our hold on the sock */
217 sock_put(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Daniel Borkmannff2266c2013-04-15 03:27:17 +0000219 kfree(ep);
220 SCTP_DBG_OBJCNT_DEC(ep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221}
222
223/* Hold a reference to an endpoint. */
224void sctp_endpoint_hold(struct sctp_endpoint *ep)
225{
Reshetova, Elenac6384572017-07-04 15:53:28 +0300226 refcount_inc(&ep->base.refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227}
228
229/* Release a reference to an endpoint and clean up if there are
230 * no more references.
231 */
232void sctp_endpoint_put(struct sctp_endpoint *ep)
233{
Reshetova, Elenac6384572017-07-04 15:53:28 +0300234 if (refcount_dec_and_test(&ep->base.refcnt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 sctp_endpoint_destroy(ep);
236}
237
238/* Is this the endpoint we are looking for? */
239struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
Eric W. Biederman4cdadcb2012-08-06 08:40:21 +0000240 struct net *net,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 const union sctp_addr *laddr)
242{
Vlad Yasevich559cf712007-09-16 16:03:28 -0700243 struct sctp_endpoint *retval = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Eric W. Biederman4cdadcb2012-08-06 08:40:21 +0000245 if ((htons(ep->base.bind_addr.port) == laddr->v4.sin_port) &&
246 net_eq(sock_net(ep->base.sk), net)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 if (sctp_bind_addr_match(&ep->base.bind_addr, laddr,
Vlad Yasevich559cf712007-09-16 16:03:28 -0700248 sctp_sk(ep->base.sk)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 retval = ep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 }
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 return retval;
253}
254
255/* Find the association that goes with this chunk.
Xin Long4f008782015-12-30 23:50:47 +0800256 * We lookup the transport from hashtable at first, then get association
257 * through t->assoc.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 */
Xin Longc79c0662015-12-30 23:50:50 +0800259struct sctp_association *sctp_endpoint_lookup_assoc(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 const struct sctp_endpoint *ep,
261 const union sctp_addr *paddr,
262 struct sctp_transport **transport)
263{
Vlad Yasevich123ed972007-11-09 11:41:36 -0500264 struct sctp_association *asoc = NULL;
Xin Long4f008782015-12-30 23:50:47 +0800265 struct sctp_transport *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
267 *transport = NULL;
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000268
269 /* If the local port is not set, there can't be any associations
270 * on this endpoint.
271 */
272 if (!ep->base.bind_addr.port)
Xin Long5cb2cd62016-12-15 23:00:55 +0800273 return NULL;
274
275 rcu_read_lock();
Xin Long4f008782015-12-30 23:50:47 +0800276 t = sctp_epaddr_lookup_transport(ep, paddr);
Xin Longdd7445a2016-01-16 20:17:17 +0800277 if (!t)
Xin Long4f008782015-12-30 23:50:47 +0800278 goto out;
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000279
Xin Long4f008782015-12-30 23:50:47 +0800280 *transport = t;
281 asoc = t->asoc;
Vlad Yasevichdeb85a62011-04-19 21:29:23 +0000282out:
Xin Long5cb2cd62016-12-15 23:00:55 +0800283 rcu_read_unlock();
Vlad Yasevich123ed972007-11-09 11:41:36 -0500284 return asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285}
286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287/* Look for any peeled off association from the endpoint that matches the
288 * given peer address.
289 */
Xin Long53066532018-03-26 16:55:00 +0800290bool sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
291 const union sctp_addr *paddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 struct sctp_sockaddr_entry *addr;
294 struct sctp_bind_addr *bp;
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000295 struct net *net = sock_net(ep->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 bp = &ep->base.bind_addr;
Vlad Yasevich559cf712007-09-16 16:03:28 -0700298 /* This function is called with the socket lock held,
299 * so the address_list can not change.
300 */
301 list_for_each_entry(addr, &bp->address_list, list) {
Eric W. Biederman4110cc22012-08-06 08:41:13 +0000302 if (sctp_has_association(net, &addr->a, paddr))
Xin Long53066532018-03-26 16:55:00 +0800303 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Xin Long53066532018-03-26 16:55:00 +0800306 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307}
308
309/* Do delayed input processing. This is scheduled by sctp_rcv().
310 * This may be called on BH or task time.
311 */
David Howellsc4028952006-11-22 14:57:56 +0000312static void sctp_endpoint_bh_rcv(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313{
David Howellsc4028952006-11-22 14:57:56 +0000314 struct sctp_endpoint *ep =
315 container_of(work, struct sctp_endpoint,
316 base.inqueue.immediate);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 struct sctp_association *asoc;
318 struct sock *sk;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000319 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 struct sctp_transport *transport;
321 struct sctp_chunk *chunk;
322 struct sctp_inq *inqueue;
Xin Longbfc6f822017-08-05 20:00:04 +0800323 union sctp_subtype subtype;
Xin Long52106012017-08-05 19:59:59 +0800324 enum sctp_state state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 int error = 0;
Justin P. Mattock42b2aa82011-11-28 20:31:00 -0800326 int first_time = 1; /* is this the first time through the loop */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328 if (ep->base.dead)
329 return;
330
331 asoc = NULL;
332 inqueue = &ep->base.inqueue;
333 sk = ep->base.sk;
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000334 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336 while (NULL != (chunk = sctp_inq_pop(inqueue))) {
337 subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);
338
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700339 /* If the first chunk in the packet is AUTH, do special
340 * processing specified in Section 6.3 of SCTP-AUTH spec
341 */
342 if (first_time && (subtype.chunk == SCTP_CID_AUTH)) {
343 struct sctp_chunkhdr *next_hdr;
344
345 next_hdr = sctp_inq_peek(inqueue);
346 if (!next_hdr)
347 goto normal;
348
349 /* If the next chunk is COOKIE-ECHO, skip the AUTH
350 * chunk while saving a pointer to it so we can do
351 * Authentication later (during cookie-echo
352 * processing).
353 */
354 if (next_hdr->type == SCTP_CID_COOKIE_ECHO) {
355 chunk->auth_chunk = skb_clone(chunk->skb,
356 GFP_ATOMIC);
357 chunk->auth = 1;
358 continue;
359 }
360 }
361normal:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 /* We might have grown an association since last we
363 * looked, so try again.
364 *
365 * This happens when we've just processed our
366 * COOKIE-ECHO chunk.
367 */
368 if (NULL == chunk->asoc) {
369 asoc = sctp_endpoint_lookup_assoc(ep,
370 sctp_source(chunk),
371 &transport);
372 chunk->asoc = asoc;
373 chunk->transport = transport;
374 }
375
376 state = asoc ? asoc->state : SCTP_STATE_CLOSED;
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700377 if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth)
378 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
380 /* Remember where the last DATA chunk came from so we
381 * know where to send the SACK.
382 */
383 if (asoc && sctp_chunk_is_data(chunk))
384 asoc->peer.last_data_from = chunk->transport;
Michele Baldessari196d6752012-12-01 04:49:42 +0000385 else {
Eric W. Biedermanb01a2402012-08-06 08:47:55 +0000386 SCTP_INC_STATS(sock_net(ep->base.sk), SCTP_MIB_INCTRLCHUNKS);
Michele Baldessari196d6752012-12-01 04:49:42 +0000387 if (asoc)
388 asoc->stats.ictrlchunks++;
389 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
391 if (chunk->transport)
Daniel Borkmanne5752352014-06-11 18:19:30 +0200392 chunk->transport->last_time_heard = ktime_get();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000394 error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, state,
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900395 ep, asoc, chunk, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
397 if (error && chunk)
398 chunk->pdiscard = 1;
399
400 /* Check to see if the endpoint is freed in response to
401 * the incoming chunk. If so, get out of the while loop.
402 */
403 if (!sctp_sk(sk)->ep)
404 break;
Vlad Yasevichbbd0d592007-10-03 17:51:34 -0700405
406 if (first_time)
407 first_time = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 }
409}