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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 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 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
13 *
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
17 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050018 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
22 * any later version.
23 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050024 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
29 *
30 * You should have received a copy of the GNU General Public License
Jeff Kirsher4b2f13a2013-12-06 06:28:48 -080031 * along with GNU CC; see the file COPYING. If not, see
32 * <http://www.gnu.org/licenses/>.
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 *
34 * Please send any bug reports or fixes you make to the
35 * email address(es):
Daniel Borkmann91705c62013-07-23 14:51:47 +020036 * lksctp developers <linux-sctp@vger.kernel.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 * Written or modified by:
39 * La Monte H.P. Yarroll <piggy@acm.org>
40 * Narasimha Budihal <narsi@refcode.org>
41 * Karl Knutson <karl@athena.chicago.il.us>
42 * Jon Grimm <jgrimm@us.ibm.com>
43 * Xingang Guo <xingang.guo@intel.com>
44 * Daisy Chang <daisyc@us.ibm.com>
45 * Sridhar Samudrala <samudrala@us.ibm.com>
46 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
47 * Ardelle Fan <ardelle.fan@intel.com>
48 * Ryan Layer <rmlayer@us.ibm.com>
49 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
50 * Kevin Gao <kevin.gao@intel.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 */
52
Joe Perches145ce502010-08-24 13:21:08 +000053#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#include <linux/types.h>
56#include <linux/kernel.h>
57#include <linux/wait.h>
58#include <linux/time.h>
59#include <linux/ip.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080060#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <linux/fcntl.h>
62#include <linux/poll.h>
63#include <linux/init.h>
64#include <linux/crypto.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090065#include <linux/slab.h>
Al Viro56b31d12012-08-18 00:25:51 -040066#include <linux/file.h>
Daniel Borkmannffd59392014-02-17 12:11:11 +010067#include <linux/compat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
69#include <net/ip.h>
70#include <net/icmp.h>
71#include <net/route.h>
72#include <net/ipv6.h>
73#include <net/inet_common.h>
74
75#include <linux/socket.h> /* for sa_family_t */
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040076#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070077#include <net/sock.h>
78#include <net/sctp/sctp.h>
79#include <net/sctp/sm.h>
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081/* Forward declarations for internal helper functions. */
82static int sctp_writeable(struct sock *sk);
83static void sctp_wfree(struct sk_buff *skb);
84static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
85 size_t msg_len);
wangweidong26ac8e52013-12-23 12:16:51 +080086static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
88static int sctp_wait_for_accept(struct sock *sk, long timeo);
89static void sctp_wait_for_close(struct sock *sk, long timeo);
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +020090static void sctp_destruct_sock(struct sock *sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
92 union sctp_addr *addr, int len);
93static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
94static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
95static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
96static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
97static int sctp_send_asconf(struct sctp_association *asoc,
98 struct sctp_chunk *chunk);
99static int sctp_do_bind(struct sock *, union sctp_addr *, int);
100static int sctp_autobind(struct sock *sk);
101static void sctp_sock_migrate(struct sock *, struct sock *,
102 struct sctp_association *, sctp_socket_type_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Neil Horman4d93df02007-08-15 16:07:44 -0700104extern struct kmem_cache *sctp_bucket_cachep;
Eric Dumazet8d987e52010-11-09 23:24:26 +0000105extern long sysctl_sctp_mem[3];
Neil Horman4d93df02007-08-15 16:07:44 -0700106extern int sysctl_sctp_rmem[3];
107extern int sysctl_sctp_wmem[3];
108
Adrian Bunkb6fa1a42007-09-12 15:18:00 +0200109static int sctp_memory_pressure;
Eric Dumazet8d987e52010-11-09 23:24:26 +0000110static atomic_long_t sctp_memory_allocated;
Eric Dumazet17483762008-11-25 21:16:35 -0800111struct percpu_counter sctp_sockets_allocated;
Neil Horman4d93df02007-08-15 16:07:44 -0700112
Pavel Emelyanov5c52ba12008-07-16 20:28:10 -0700113static void sctp_enter_memory_pressure(struct sock *sk)
Neil Horman4d93df02007-08-15 16:07:44 -0700114{
115 sctp_memory_pressure = 1;
116}
117
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119/* Get the sndbuf space available at the time on the association. */
120static inline int sctp_wspace(struct sctp_association *asoc)
121{
Neil Horman4d93df02007-08-15 16:07:44 -0700122 int amt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Neil Horman4d93df02007-08-15 16:07:44 -0700124 if (asoc->ep->sndbuf_policy)
125 amt = asoc->sndbuf_used;
126 else
Eric Dumazet31e6d362009-06-17 19:05:41 -0700127 amt = sk_wmem_alloc_get(asoc->base.sk);
Neil Horman4d93df02007-08-15 16:07:44 -0700128
129 if (amt >= asoc->base.sk->sk_sndbuf) {
130 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
131 amt = 0;
132 else {
133 amt = sk_stream_wspace(asoc->base.sk);
134 if (amt < 0)
135 amt = 0;
136 }
Neil Horman4eb701d2005-04-28 12:02:04 -0700137 } else {
Neil Horman4d93df02007-08-15 16:07:44 -0700138 amt = asoc->base.sk->sk_sndbuf - amt;
Neil Horman4eb701d2005-04-28 12:02:04 -0700139 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 return amt;
141}
142
143/* Increment the used sndbuf space count of the corresponding association by
144 * the size of the outgoing data chunk.
145 * Also, set the skb destructor for sndbuf accounting later.
146 *
147 * Since it is always 1-1 between chunk and skb, and also a new skb is always
148 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
149 * destructor in the data chunk skb for the purpose of the sndbuf space
150 * tracking.
151 */
152static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
153{
154 struct sctp_association *asoc = chunk->asoc;
155 struct sock *sk = asoc->base.sk;
156
157 /* The sndbuf space is tracked per association. */
158 sctp_association_hold(asoc);
159
Neil Horman4eb701d2005-04-28 12:02:04 -0700160 skb_set_owner_w(chunk->skb, sk);
161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 chunk->skb->destructor = sctp_wfree;
163 /* Save the chunk pointer in skb for sctp_wfree to use later. */
164 *((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
165
Neil Horman4eb701d2005-04-28 12:02:04 -0700166 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
167 sizeof(struct sk_buff) +
168 sizeof(struct sctp_chunk);
169
Neil Horman4eb701d2005-04-28 12:02:04 -0700170 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
Hideo Aoki3ab224b2007-12-31 00:11:19 -0800171 sk->sk_wmem_queued += chunk->skb->truesize;
172 sk_mem_charge(sk, chunk->skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173}
174
175/* Verify that this is a valid address. */
176static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
177 int len)
178{
179 struct sctp_af *af;
180
181 /* Verify basic sockaddr. */
182 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
183 if (!af)
184 return -EINVAL;
185
186 /* Is this a valid SCTP address? */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700187 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 return -EINVAL;
189
190 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
191 return -EINVAL;
192
193 return 0;
194}
195
196/* Look up the association by its id. If this is not a UDP-style
197 * socket, the ID field is always ignored.
198 */
199struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
200{
201 struct sctp_association *asoc = NULL;
202
203 /* If this is not a UDP-style socket, assoc id should be ignored. */
204 if (!sctp_style(sk, UDP)) {
205 /* Return NULL if the socket state is not ESTABLISHED. It
206 * could be a TCP-style listening socket or a socket which
207 * hasn't yet called connect() to establish an association.
208 */
209 if (!sctp_sstate(sk, ESTABLISHED))
210 return NULL;
211
212 /* Get the first and the only association from the list. */
213 if (!list_empty(&sctp_sk(sk)->ep->asocs))
214 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
215 struct sctp_association, asocs);
216 return asoc;
217 }
218
219 /* Otherwise this is a UDP-style socket. */
220 if (!id || (id == (sctp_assoc_t)-1))
221 return NULL;
222
223 spin_lock_bh(&sctp_assocs_id_lock);
224 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
225 spin_unlock_bh(&sctp_assocs_id_lock);
226
227 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
228 return NULL;
229
230 return asoc;
231}
232
233/* Look up the transport from an address and an assoc id. If both address and
234 * id are specified, the associations matching the address and the id should be
235 * the same.
236 */
237static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
238 struct sockaddr_storage *addr,
239 sctp_assoc_t id)
240{
241 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
242 struct sctp_transport *transport;
243 union sctp_addr *laddr = (union sctp_addr *)addr;
244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
Al Virocd4ff032006-11-20 17:11:33 -0800246 laddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249 if (!addr_asoc)
250 return NULL;
251
252 id_asoc = sctp_id2assoc(sk, id);
253 if (id_asoc && (id_asoc != addr_asoc))
254 return NULL;
255
256 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
257 (union sctp_addr *)addr);
258
259 return transport;
260}
261
262/* API 3.1.2 bind() - UDP Style Syntax
263 * The syntax of bind() is,
264 *
265 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
266 *
267 * sd - the socket descriptor returned by socket().
268 * addr - the address structure (struct sockaddr_in or struct
269 * sockaddr_in6 [RFC 2553]),
270 * addr_len - the size of the address structure.
271 */
Daniel Borkmanndda91922013-06-17 11:40:05 +0200272static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273{
274 int retval = 0;
275
wangweidong048ed4b2014-01-21 15:44:11 +0800276 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Daniel Borkmannbb333812013-06-28 19:49:40 +0200278 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
279 addr, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
281 /* Disallow binding twice. */
282 if (!sctp_sk(sk)->ep->base.bind_addr.port)
Frank Filz3f7a87d2005-06-20 13:14:57 -0700283 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 addr_len);
285 else
286 retval = -EINVAL;
287
wangweidong048ed4b2014-01-21 15:44:11 +0800288 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290 return retval;
291}
292
293static long sctp_get_port_local(struct sock *, union sctp_addr *);
294
295/* Verify this is a valid sockaddr. */
296static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
297 union sctp_addr *addr, int len)
298{
299 struct sctp_af *af;
300
301 /* Check minimum size. */
302 if (len < sizeof (struct sockaddr))
303 return NULL;
304
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700305 /* V4 mapped address are really of AF_INET family */
306 if (addr->sa.sa_family == AF_INET6 &&
307 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
308 if (!opt->pf->af_supported(AF_INET, opt))
309 return NULL;
310 } else {
311 /* Does this PF support this AF? */
312 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
313 return NULL;
314 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
316 /* If we get this far, af is valid. */
317 af = sctp_get_af_specific(addr->sa.sa_family);
318
319 if (len < af->sockaddr_len)
320 return NULL;
321
322 return af;
323}
324
325/* Bind a local address either to an endpoint or to an association. */
Daniel Borkmanndda91922013-06-17 11:40:05 +0200326static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327{
Eric W. Biederman35946982012-11-16 03:03:12 +0000328 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 struct sctp_sock *sp = sctp_sk(sk);
330 struct sctp_endpoint *ep = sp->ep;
331 struct sctp_bind_addr *bp = &ep->base.bind_addr;
332 struct sctp_af *af;
333 unsigned short snum;
334 int ret = 0;
335
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 /* Common sockaddr verification. */
337 af = sctp_sockaddr_af(sp, addr, len);
Frank Filz3f7a87d2005-06-20 13:14:57 -0700338 if (!af) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200339 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
340 __func__, sk, addr, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 return -EINVAL;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700342 }
343
344 snum = ntohs(addr->v4.sin_port);
345
Daniel Borkmannbb333812013-06-28 19:49:40 +0200346 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
347 __func__, sk, &addr->sa, bp->port, snum, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349 /* PF specific bind() address verification. */
350 if (!sp->pf->bind_verify(sp, addr))
351 return -EADDRNOTAVAIL;
352
Vlad Yasevich8b358052007-05-15 17:14:58 -0400353 /* We must either be unbound, or bind to the same port.
354 * It's OK to allow 0 ports if we are already bound.
355 * We'll just inhert an already bound port in this case
356 */
357 if (bp->port) {
358 if (!snum)
359 snum = bp->port;
360 else if (snum != bp->port) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200361 pr_debug("%s: new port %d doesn't match existing port "
362 "%d\n", __func__, snum, bp->port);
Vlad Yasevich8b358052007-05-15 17:14:58 -0400363 return -EINVAL;
364 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 }
366
Eric W. Biederman35946982012-11-16 03:03:12 +0000367 if (snum && snum < PROT_SOCK &&
368 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 return -EACCES;
370
Vlad Yasevich4e540642008-07-18 23:06:32 -0700371 /* See if the address matches any of the addresses we may have
372 * already bound before checking against other endpoints.
373 */
374 if (sctp_bind_addr_match(bp, addr, sp))
375 return -EINVAL;
376
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 /* Make sure we are allowed to bind here.
378 * The function sctp_get_port_local() does duplicate address
379 * detection.
380 */
Vlad Yasevich2772b492007-08-21 14:24:30 +0900381 addr->v4.sin_port = htons(snum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 if ((ret = sctp_get_port_local(sk, addr))) {
Vlad Yasevich4e540642008-07-18 23:06:32 -0700383 return -EADDRINUSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 }
385
386 /* Refresh ephemeral port. */
387 if (!bp->port)
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000388 bp->port = inet_sk(sk)->inet_num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Vlad Yasevich559cf712007-09-16 16:03:28 -0700390 /* Add the address to the bind address list.
391 * Use GFP_ATOMIC since BHs will be disabled.
392 */
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800393 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
395 /* Copy back into socket for getsockname() use. */
396 if (!ret) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000397 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 af->to_sk_saddr(addr, sk);
399 }
400
401 return ret;
402}
403
404 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
405 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900406 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 * at any one time. If a sender, after sending an ASCONF chunk, decides
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900408 * it needs to transfer another ASCONF Chunk, it MUST wait until the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900410 * subsequent ASCONF. Note this restriction binds each side, so at any
411 * time two ASCONF may be in-transit on any given association (one sent
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 * from each endpoint).
413 */
414static int sctp_send_asconf(struct sctp_association *asoc,
415 struct sctp_chunk *chunk)
416{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000417 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 int retval = 0;
419
420 /* If there is an outstanding ASCONF chunk, queue it for later
421 * transmission.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900422 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 if (asoc->addip_last_asconf) {
David S. Miller79af02c2005-07-08 21:47:49 -0700424 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900425 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 }
427
428 /* Hold the chunk until an ASCONF_ACK is received. */
429 sctp_chunk_hold(chunk);
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000430 retval = sctp_primitive_ASCONF(net, asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 if (retval)
432 sctp_chunk_free(chunk);
433 else
434 asoc->addip_last_asconf = chunk;
435
436out:
437 return retval;
438}
439
440/* Add a list of addresses as bind addresses to local endpoint or
441 * association.
442 *
443 * Basically run through each address specified in the addrs/addrcnt
444 * array/length pair, determine if it is IPv6 or IPv4 and call
445 * sctp_do_bind() on it.
446 *
447 * If any of them fails, then the operation will be reversed and the
448 * ones that were added will be removed.
449 *
450 * Only sctp_setsockopt_bindx() is supposed to call this function.
451 */
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +0200452static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
454 int cnt;
455 int retval = 0;
456 void *addr_buf;
457 struct sockaddr *sa_addr;
458 struct sctp_af *af;
459
Daniel Borkmannbb333812013-06-28 19:49:40 +0200460 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
461 addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
463 addr_buf = addrs;
464 for (cnt = 0; cnt < addrcnt; cnt++) {
465 /* The list may contain either IPv4 or IPv6 address;
466 * determine the address length for walking thru the list.
467 */
Joe Perchesea110732011-06-13 16:21:26 +0000468 sa_addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 af = sctp_get_af_specific(sa_addr->sa_family);
470 if (!af) {
471 retval = -EINVAL;
472 goto err_bindx_add;
473 }
474
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900475 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 af->sockaddr_len);
477
478 addr_buf += af->sockaddr_len;
479
480err_bindx_add:
481 if (retval < 0) {
482 /* Failed. Cleanup the ones that have been added */
483 if (cnt > 0)
484 sctp_bindx_rem(sk, addrs, cnt);
485 return retval;
486 }
487 }
488
489 return retval;
490}
491
492/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
493 * associations that are part of the endpoint indicating that a list of local
494 * addresses are added to the endpoint.
495 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900496 * If any of the addresses is already in the bind address list of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 * association, we do not send the chunk for that association. But it will not
498 * affect other associations.
499 *
500 * Only sctp_setsockopt_bindx() is supposed to call this function.
501 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900502static int sctp_send_asconf_add_ip(struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 struct sockaddr *addrs,
504 int addrcnt)
505{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000506 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 struct sctp_sock *sp;
508 struct sctp_endpoint *ep;
509 struct sctp_association *asoc;
510 struct sctp_bind_addr *bp;
511 struct sctp_chunk *chunk;
512 struct sctp_sockaddr_entry *laddr;
513 union sctp_addr *addr;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700514 union sctp_addr saveaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 void *addr_buf;
516 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 struct list_head *p;
518 int i;
519 int retval = 0;
520
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000521 if (!net->sctp.addip_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 return retval;
523
524 sp = sctp_sk(sk);
525 ep = sp->ep;
526
Daniel Borkmannbb333812013-06-28 19:49:40 +0200527 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
528 __func__, sk, addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700530 list_for_each_entry(asoc, &ep->asocs, asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 if (!asoc->peer.asconf_capable)
532 continue;
533
534 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
535 continue;
536
537 if (!sctp_state(asoc, ESTABLISHED))
538 continue;
539
540 /* Check if any address in the packed array of addresses is
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900541 * in the bind address list of the association. If so,
542 * do not send the asconf chunk to its peer, but continue with
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 * other associations.
544 */
545 addr_buf = addrs;
546 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000547 addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 af = sctp_get_af_specific(addr->v4.sin_family);
549 if (!af) {
550 retval = -EINVAL;
551 goto out;
552 }
553
554 if (sctp_assoc_lookup_laddr(asoc, addr))
555 break;
556
557 addr_buf += af->sockaddr_len;
558 }
559 if (i < addrcnt)
560 continue;
561
Vlad Yasevich559cf712007-09-16 16:03:28 -0700562 /* Use the first valid address in bind addr list of
563 * association as Address Parameter of ASCONF CHUNK.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 bp = &asoc->base.bind_addr;
566 p = bp->address_list.next;
567 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
Al Viro5ae955c2006-11-20 17:22:08 -0800568 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 addrcnt, SCTP_PARAM_ADD_IP);
570 if (!chunk) {
571 retval = -ENOMEM;
572 goto out;
573 }
574
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700575 /* Add the new addresses to the bind address list with
576 * use_as_src set to 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 */
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700578 addr_buf = addrs;
579 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000580 addr = addr_buf;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700581 af = sctp_get_af_specific(addr->v4.sin_family);
582 memcpy(&saveaddr, addr, af->sockaddr_len);
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800583 retval = sctp_add_bind_addr(bp, &saveaddr,
584 SCTP_ADDR_NEW, GFP_ATOMIC);
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700585 addr_buf += af->sockaddr_len;
586 }
Michio Honda8a07eb02011-04-26 20:19:36 +0900587 if (asoc->src_out_of_asoc_ok) {
588 struct sctp_transport *trans;
589
590 list_for_each_entry(trans,
591 &asoc->peer.transport_addr_list, transports) {
592 /* Clear the source and route cache */
593 dst_release(trans->dst);
594 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
595 2*asoc->pathmtu, 4380));
596 trans->ssthresh = asoc->peer.i.a_rwnd;
597 trans->rto = asoc->rto_initial;
Michele Baldessari196d6752012-12-01 04:49:42 +0000598 sctp_max_rto(asoc, trans);
Michio Honda8a07eb02011-04-26 20:19:36 +0900599 trans->rtt = trans->srtt = trans->rttvar = 0;
600 sctp_transport_route(trans, NULL,
601 sctp_sk(asoc->base.sk));
602 }
603 }
604 retval = sctp_send_asconf(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 }
606
607out:
608 return retval;
609}
610
611/* Remove a list of addresses from bind addresses list. Do not remove the
612 * last address.
613 *
614 * Basically run through each address specified in the addrs/addrcnt
615 * array/length pair, determine if it is IPv6 or IPv4 and call
616 * sctp_del_bind() on it.
617 *
618 * If any of them fails, then the operation will be reversed and the
619 * ones that were removed will be added back.
620 *
621 * At least one address has to be left; if only one address is
622 * available, the operation will return -EBUSY.
623 *
624 * Only sctp_setsockopt_bindx() is supposed to call this function.
625 */
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +0200626static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627{
628 struct sctp_sock *sp = sctp_sk(sk);
629 struct sctp_endpoint *ep = sp->ep;
630 int cnt;
631 struct sctp_bind_addr *bp = &ep->base.bind_addr;
632 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 void *addr_buf;
Al Viroc9a08502006-11-20 17:07:48 -0800634 union sctp_addr *sa_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 struct sctp_af *af;
636
Daniel Borkmannbb333812013-06-28 19:49:40 +0200637 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
638 __func__, sk, addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
640 addr_buf = addrs;
641 for (cnt = 0; cnt < addrcnt; cnt++) {
642 /* If the bind address list is empty or if there is only one
643 * bind address, there is nothing more to be removed (we need
644 * at least one address here).
645 */
646 if (list_empty(&bp->address_list) ||
647 (sctp_list_single_entry(&bp->address_list))) {
648 retval = -EBUSY;
649 goto err_bindx_rem;
650 }
651
Joe Perchesea110732011-06-13 16:21:26 +0000652 sa_addr = addr_buf;
Al Viroc9a08502006-11-20 17:07:48 -0800653 af = sctp_get_af_specific(sa_addr->sa.sa_family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 if (!af) {
655 retval = -EINVAL;
656 goto err_bindx_rem;
657 }
Paolo Galtieri0304ff8a2007-04-17 12:52:36 -0700658
659 if (!af->addr_valid(sa_addr, sp, NULL)) {
660 retval = -EADDRNOTAVAIL;
661 goto err_bindx_rem;
662 }
663
Vlad Yasevichee9cbac2011-04-18 19:14:47 +0000664 if (sa_addr->v4.sin_port &&
665 sa_addr->v4.sin_port != htons(bp->port)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 retval = -EINVAL;
667 goto err_bindx_rem;
668 }
669
Vlad Yasevichee9cbac2011-04-18 19:14:47 +0000670 if (!sa_addr->v4.sin_port)
671 sa_addr->v4.sin_port = htons(bp->port);
672
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 /* FIXME - There is probably a need to check if sk->sk_saddr and
674 * sk->sk_rcv_addr are currently set to one of the addresses to
675 * be removed. This is something which needs to be looked into
676 * when we are fixing the outstanding issues with multi-homing
677 * socket routing and failover schemes. Refer to comments in
678 * sctp_do_bind(). -daisy
679 */
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -0400680 retval = sctp_del_bind_addr(bp, sa_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
682 addr_buf += af->sockaddr_len;
683err_bindx_rem:
684 if (retval < 0) {
685 /* Failed. Add the ones that has been removed back */
686 if (cnt > 0)
687 sctp_bindx_add(sk, addrs, cnt);
688 return retval;
689 }
690 }
691
692 return retval;
693}
694
695/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
696 * the associations that are part of the endpoint indicating that a list of
697 * local addresses are removed from the endpoint.
698 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900699 * If any of the addresses is already in the bind address list of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 * association, we do not send the chunk for that association. But it will not
701 * affect other associations.
702 *
703 * Only sctp_setsockopt_bindx() is supposed to call this function.
704 */
705static int sctp_send_asconf_del_ip(struct sock *sk,
706 struct sockaddr *addrs,
707 int addrcnt)
708{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000709 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 struct sctp_sock *sp;
711 struct sctp_endpoint *ep;
712 struct sctp_association *asoc;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700713 struct sctp_transport *transport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 struct sctp_bind_addr *bp;
715 struct sctp_chunk *chunk;
716 union sctp_addr *laddr;
717 void *addr_buf;
718 struct sctp_af *af;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700719 struct sctp_sockaddr_entry *saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 int i;
721 int retval = 0;
Michio Honda8a07eb02011-04-26 20:19:36 +0900722 int stored = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
Michio Honda8a07eb02011-04-26 20:19:36 +0900724 chunk = NULL;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000725 if (!net->sctp.addip_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 return retval;
727
728 sp = sctp_sk(sk);
729 ep = sp->ep;
730
Daniel Borkmannbb333812013-06-28 19:49:40 +0200731 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
732 __func__, sk, addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700734 list_for_each_entry(asoc, &ep->asocs, asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
736 if (!asoc->peer.asconf_capable)
737 continue;
738
739 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
740 continue;
741
742 if (!sctp_state(asoc, ESTABLISHED))
743 continue;
744
745 /* Check if any address in the packed array of addresses is
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900746 * not present in the bind address list of the association.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 * If so, do not send the asconf chunk to its peer, but
748 * continue with other associations.
749 */
750 addr_buf = addrs;
751 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000752 laddr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 af = sctp_get_af_specific(laddr->v4.sin_family);
754 if (!af) {
755 retval = -EINVAL;
756 goto out;
757 }
758
759 if (!sctp_assoc_lookup_laddr(asoc, laddr))
760 break;
761
762 addr_buf += af->sockaddr_len;
763 }
764 if (i < addrcnt)
765 continue;
766
767 /* Find one address in the association's bind address list
768 * that is not in the packed array of addresses. This is to
769 * make sure that we do not delete all the addresses in the
770 * association.
771 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 bp = &asoc->base.bind_addr;
773 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
774 addrcnt, sp);
Michio Honda8a07eb02011-04-26 20:19:36 +0900775 if ((laddr == NULL) && (addrcnt == 1)) {
776 if (asoc->asconf_addr_del_pending)
777 continue;
778 asoc->asconf_addr_del_pending =
779 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
Michio Honda6d65e5e2011-06-10 16:42:14 +0900780 if (asoc->asconf_addr_del_pending == NULL) {
781 retval = -ENOMEM;
782 goto out;
783 }
Michio Honda8a07eb02011-04-26 20:19:36 +0900784 asoc->asconf_addr_del_pending->sa.sa_family =
785 addrs->sa_family;
786 asoc->asconf_addr_del_pending->v4.sin_port =
787 htons(bp->port);
788 if (addrs->sa_family == AF_INET) {
789 struct sockaddr_in *sin;
790
791 sin = (struct sockaddr_in *)addrs;
792 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
793 } else if (addrs->sa_family == AF_INET6) {
794 struct sockaddr_in6 *sin6;
795
796 sin6 = (struct sockaddr_in6 *)addrs;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000797 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
Michio Honda8a07eb02011-04-26 20:19:36 +0900798 }
Daniel Borkmannbb333812013-06-28 19:49:40 +0200799
800 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
801 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
802 asoc->asconf_addr_del_pending);
803
Michio Honda8a07eb02011-04-26 20:19:36 +0900804 asoc->src_out_of_asoc_ok = 1;
805 stored = 1;
806 goto skip_mkasconf;
807 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
Daniel Borkmann88362ad2013-09-07 20:51:21 +0200809 if (laddr == NULL)
810 return -EINVAL;
811
Vlad Yasevich559cf712007-09-16 16:03:28 -0700812 /* We do not need RCU protection throughout this loop
813 * because this is done under a socket lock from the
814 * setsockopt call.
815 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
817 SCTP_PARAM_DEL_IP);
818 if (!chunk) {
819 retval = -ENOMEM;
820 goto out;
821 }
822
Michio Honda8a07eb02011-04-26 20:19:36 +0900823skip_mkasconf:
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700824 /* Reset use_as_src flag for the addresses in the bind address
825 * list that are to be deleted.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 */
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700827 addr_buf = addrs;
828 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000829 laddr = addr_buf;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700830 af = sctp_get_af_specific(laddr->v4.sin_family);
Vlad Yasevich559cf712007-09-16 16:03:28 -0700831 list_for_each_entry(saddr, &bp->address_list, list) {
Al Viro5f242a12006-11-20 17:05:23 -0800832 if (sctp_cmp_addr_exact(&saddr->a, laddr))
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800833 saddr->state = SCTP_ADDR_DEL;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700834 }
835 addr_buf += af->sockaddr_len;
836 }
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700837
838 /* Update the route and saddr entries for all the transports
839 * as some of the addresses in the bind address list are
840 * about to be deleted and cannot be used as source addresses.
841 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700842 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
843 transports) {
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700844 dst_release(transport->dst);
845 sctp_transport_route(transport, NULL,
846 sctp_sk(asoc->base.sk));
847 }
848
Michio Honda8a07eb02011-04-26 20:19:36 +0900849 if (stored)
850 /* We don't need to transmit ASCONF */
851 continue;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700852 retval = sctp_send_asconf(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 }
854out:
855 return retval;
856}
857
Michio Honda9f7d6532011-04-26 19:32:51 +0900858/* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
859int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
860{
861 struct sock *sk = sctp_opt2sk(sp);
862 union sctp_addr *addr;
863 struct sctp_af *af;
864
865 /* It is safe to write port space in caller. */
866 addr = &addrw->a;
867 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
868 af = sctp_get_af_specific(addr->sa.sa_family);
869 if (!af)
870 return -EINVAL;
871 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
872 return -EINVAL;
873
874 if (addrw->state == SCTP_ADDR_NEW)
875 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
876 else
877 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
878}
879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
881 *
882 * API 8.1
883 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
884 * int flags);
885 *
886 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
887 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
888 * or IPv6 addresses.
889 *
890 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
891 * Section 3.1.2 for this usage.
892 *
893 * addrs is a pointer to an array of one or more socket addresses. Each
894 * address is contained in its appropriate structure (i.e. struct
895 * sockaddr_in or struct sockaddr_in6) the family of the address type
Ville Nuorvala23c435f2006-10-16 22:08:28 -0700896 * must be used to distinguish the address length (note that this
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 * representation is termed a "packed array" of addresses). The caller
898 * specifies the number of addresses in the array with addrcnt.
899 *
900 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
901 * -1, and sets errno to the appropriate error code.
902 *
903 * For SCTP, the port given in each socket address must be the same, or
904 * sctp_bindx() will fail, setting errno to EINVAL.
905 *
906 * The flags parameter is formed from the bitwise OR of zero or more of
907 * the following currently defined flags:
908 *
909 * SCTP_BINDX_ADD_ADDR
910 *
911 * SCTP_BINDX_REM_ADDR
912 *
913 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
914 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
915 * addresses from the association. The two flags are mutually exclusive;
916 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
917 * not remove all addresses from an association; sctp_bindx() will
918 * reject such an attempt with EINVAL.
919 *
920 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
921 * additional addresses with an endpoint after calling bind(). Or use
922 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
923 * socket is associated with so that no new association accepted will be
924 * associated with those addresses. If the endpoint supports dynamic
925 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
926 * endpoint to send the appropriate message to the peer to change the
927 * peers address lists.
928 *
929 * Adding and removing addresses from a connected association is
930 * optional functionality. Implementations that do not support this
931 * functionality should return EOPNOTSUPP.
932 *
933 * Basically do nothing but copying the addresses from user to kernel
934 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
Frank Filz3f7a87d2005-06-20 13:14:57 -0700935 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
936 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 *
938 * We don't use copy_from_user() for optimization: we first do the
939 * sanity checks (buffer size -fast- and access check-healthy
940 * pointer); if all of those succeed, then we can alloc the memory
941 * (expensive operation) needed to copy the data to kernel. Then we do
942 * the copying without checking the user space area
943 * (__copy_from_user()).
944 *
945 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
946 * it.
947 *
948 * sk The sk of the socket
949 * addrs The pointer to the addresses in user land
950 * addrssize Size of the addrs buffer
951 * op Operation to perform (add or remove, see the flags of
952 * sctp_bindx)
953 *
954 * Returns 0 if ok, <0 errno code on error.
955 */
wangweidong26ac8e52013-12-23 12:16:51 +0800956static int sctp_setsockopt_bindx(struct sock *sk,
Daniel Borkmanndda91922013-06-17 11:40:05 +0200957 struct sockaddr __user *addrs,
958 int addrs_size, int op)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959{
960 struct sockaddr *kaddrs;
961 int err;
962 int addrcnt = 0;
963 int walk_size = 0;
964 struct sockaddr *sa_addr;
965 void *addr_buf;
966 struct sctp_af *af;
967
Daniel Borkmannbb333812013-06-28 19:49:40 +0200968 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
969 __func__, sk, addrs, addrs_size, op);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970
971 if (unlikely(addrs_size <= 0))
972 return -EINVAL;
973
974 /* Check the user passed a healthy pointer. */
975 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
976 return -EFAULT;
977
978 /* Alloc space for the address array in kernel memory. */
Kris Katterjohn8b3a7002006-01-11 15:56:43 -0800979 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 if (unlikely(!kaddrs))
981 return -ENOMEM;
982
983 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
984 kfree(kaddrs);
985 return -EFAULT;
986 }
987
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900988 /* Walk through the addrs buffer and count the number of addresses. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 addr_buf = kaddrs;
990 while (walk_size < addrs_size) {
Dan Rosenbergd7e0d192010-10-01 11:16:58 +0000991 if (walk_size + sizeof(sa_family_t) > addrs_size) {
992 kfree(kaddrs);
993 return -EINVAL;
994 }
995
Joe Perchesea110732011-06-13 16:21:26 +0000996 sa_addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 af = sctp_get_af_specific(sa_addr->sa_family);
998
999 /* If the address family is not supported or if this address
1000 * causes the address buffer to overflow return EINVAL.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001001 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1003 kfree(kaddrs);
1004 return -EINVAL;
1005 }
1006 addrcnt++;
1007 addr_buf += af->sockaddr_len;
1008 walk_size += af->sockaddr_len;
1009 }
1010
1011 /* Do the work. */
1012 switch (op) {
1013 case SCTP_BINDX_ADD_ADDR:
1014 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1015 if (err)
1016 goto out;
1017 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1018 break;
1019
1020 case SCTP_BINDX_REM_ADDR:
1021 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1022 if (err)
1023 goto out;
1024 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1025 break;
1026
1027 default:
1028 err = -EINVAL;
1029 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001030 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031
1032out:
1033 kfree(kaddrs);
1034
1035 return err;
1036}
1037
Frank Filz3f7a87d2005-06-20 13:14:57 -07001038/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1039 *
1040 * Common routine for handling connect() and sctp_connectx().
1041 * Connect will come in with just a single address.
1042 */
wangweidong26ac8e52013-12-23 12:16:51 +08001043static int __sctp_connect(struct sock *sk,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001044 struct sockaddr *kaddrs,
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001045 int addrs_size,
1046 sctp_assoc_t *assoc_id)
Frank Filz3f7a87d2005-06-20 13:14:57 -07001047{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001048 struct net *net = sock_net(sk);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001049 struct sctp_sock *sp;
1050 struct sctp_endpoint *ep;
1051 struct sctp_association *asoc = NULL;
1052 struct sctp_association *asoc2;
1053 struct sctp_transport *transport;
1054 union sctp_addr to;
1055 struct sctp_af *af;
1056 sctp_scope_t scope;
1057 long timeo;
1058 int err = 0;
1059 int addrcnt = 0;
1060 int walk_size = 0;
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001061 union sctp_addr *sa_addr = NULL;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001062 void *addr_buf;
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001063 unsigned short port;
Vlad Yasevichf50f95c2007-07-03 12:47:40 -04001064 unsigned int f_flags = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001065
1066 sp = sctp_sk(sk);
1067 ep = sp->ep;
1068
1069 /* connect() cannot be done on a socket that is already in ESTABLISHED
1070 * state - UDP-style peeled off socket or a TCP-style socket that
1071 * is already connected.
1072 * It cannot be done even on a TCP-style listening socket.
1073 */
1074 if (sctp_sstate(sk, ESTABLISHED) ||
1075 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1076 err = -EISCONN;
1077 goto out_free;
1078 }
1079
1080 /* Walk through the addrs buffer and count the number of addresses. */
1081 addr_buf = kaddrs;
1082 while (walk_size < addrs_size) {
Dan Rosenbergd7e0d192010-10-01 11:16:58 +00001083 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1084 err = -EINVAL;
1085 goto out_free;
1086 }
1087
Joe Perchesea110732011-06-13 16:21:26 +00001088 sa_addr = addr_buf;
Al Viro4bdf4b52006-11-20 17:10:20 -08001089 af = sctp_get_af_specific(sa_addr->sa.sa_family);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001090
1091 /* If the address family is not supported or if this address
1092 * causes the address buffer to overflow return EINVAL.
1093 */
1094 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1095 err = -EINVAL;
1096 goto out_free;
1097 }
1098
Dan Rosenbergd7e0d192010-10-01 11:16:58 +00001099 port = ntohs(sa_addr->v4.sin_port);
1100
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001101 /* Save current address so we can work with it */
1102 memcpy(&to, sa_addr, af->sockaddr_len);
1103
1104 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001105 if (err)
1106 goto out_free;
1107
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001108 /* Make sure the destination port is correctly set
1109 * in all addresses.
1110 */
Wei Yongjun524fba62013-04-03 03:02:28 +00001111 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1112 err = -EINVAL;
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001113 goto out_free;
Wei Yongjun524fba62013-04-03 03:02:28 +00001114 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001115
1116 /* Check if there already is a matching association on the
1117 * endpoint (other than the one created here).
1118 */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001119 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001120 if (asoc2 && asoc2 != asoc) {
1121 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1122 err = -EISCONN;
1123 else
1124 err = -EALREADY;
1125 goto out_free;
1126 }
1127
1128 /* If we could not find a matching association on the endpoint,
1129 * make sure that there is no peeled-off association matching
1130 * the peer address even on another socket.
1131 */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001132 if (sctp_endpoint_is_peeled_off(ep, &to)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -07001133 err = -EADDRNOTAVAIL;
1134 goto out_free;
1135 }
1136
1137 if (!asoc) {
1138 /* If a bind() or sctp_bindx() is not called prior to
1139 * an sctp_connectx() call, the system picks an
1140 * ephemeral port and will choose an address set
1141 * equivalent to binding with a wildcard address.
1142 */
1143 if (!ep->base.bind_addr.port) {
1144 if (sctp_autobind(sk)) {
1145 err = -EAGAIN;
1146 goto out_free;
1147 }
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001148 } else {
1149 /*
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001150 * If an unprivileged user inherits a 1-many
1151 * style socket with open associations on a
1152 * privileged port, it MAY be permitted to
1153 * accept new associations, but it SHOULD NOT
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001154 * be permitted to open new associations.
1155 */
1156 if (ep->base.bind_addr.port < PROT_SOCK &&
Eric W. Biederman35946982012-11-16 03:03:12 +00001157 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001158 err = -EACCES;
1159 goto out_free;
1160 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001161 }
1162
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001163 scope = sctp_scope(&to);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001164 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1165 if (!asoc) {
1166 err = -ENOMEM;
1167 goto out_free;
1168 }
Vlad Yasevich409b95a2009-11-10 08:57:34 +00001169
1170 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1171 GFP_KERNEL);
1172 if (err < 0) {
1173 goto out_free;
1174 }
1175
Frank Filz3f7a87d2005-06-20 13:14:57 -07001176 }
1177
1178 /* Prime the peer's transport structures. */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001179 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001180 SCTP_UNKNOWN);
1181 if (!transport) {
1182 err = -ENOMEM;
1183 goto out_free;
1184 }
1185
1186 addrcnt++;
1187 addr_buf += af->sockaddr_len;
1188 walk_size += af->sockaddr_len;
1189 }
1190
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001191 /* In case the user of sctp_connectx() wants an association
1192 * id back, assign one now.
1193 */
1194 if (assoc_id) {
1195 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1196 if (err < 0)
1197 goto out_free;
1198 }
1199
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001200 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001201 if (err < 0) {
1202 goto out_free;
1203 }
1204
1205 /* Initialize sk's dport and daddr for getpeername() */
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001206 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001207 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1208 af->to_sk_daddr(sa_addr, sk);
Sridhar Samudrala8de8c872006-05-19 10:58:12 -07001209 sk->sk_err = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001210
Vlad Yasevichf50f95c2007-07-03 12:47:40 -04001211 /* in-kernel sockets don't generally have a file allocated to them
1212 * if all they do is call sock_create_kern().
1213 */
1214 if (sk->sk_socket->file)
1215 f_flags = sk->sk_socket->file->f_flags;
1216
1217 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1218
Frank Filz3f7a87d2005-06-20 13:14:57 -07001219 err = sctp_wait_for_connect(asoc, &timeo);
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001220 if ((err == 0 || err == -EINPROGRESS) && assoc_id)
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001221 *assoc_id = asoc->assoc_id;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001222
1223 /* Don't free association on exit. */
1224 asoc = NULL;
1225
1226out_free:
Daniel Borkmannbb333812013-06-28 19:49:40 +02001227 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1228 __func__, asoc, kaddrs, err);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001229
Neil Horman2eebc1e2012-07-16 09:13:51 +00001230 if (asoc) {
1231 /* sctp_primitive_ASSOCIATE may have added this association
1232 * To the hash table, try to unhash it, just in case, its a noop
1233 * if it wasn't hashed so we're safe
1234 */
1235 sctp_unhash_established(asoc);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001236 sctp_association_free(asoc);
Neil Horman2eebc1e2012-07-16 09:13:51 +00001237 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001238 return err;
1239}
1240
1241/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1242 *
1243 * API 8.9
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001244 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1245 * sctp_assoc_t *asoc);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001246 *
1247 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1248 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1249 * or IPv6 addresses.
1250 *
1251 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1252 * Section 3.1.2 for this usage.
1253 *
1254 * addrs is a pointer to an array of one or more socket addresses. Each
1255 * address is contained in its appropriate structure (i.e. struct
1256 * sockaddr_in or struct sockaddr_in6) the family of the address type
1257 * must be used to distengish the address length (note that this
1258 * representation is termed a "packed array" of addresses). The caller
1259 * specifies the number of addresses in the array with addrcnt.
1260 *
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001261 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1262 * the association id of the new association. On failure, sctp_connectx()
1263 * returns -1, and sets errno to the appropriate error code. The assoc_id
1264 * is not touched by the kernel.
Frank Filz3f7a87d2005-06-20 13:14:57 -07001265 *
1266 * For SCTP, the port given in each socket address must be the same, or
1267 * sctp_connectx() will fail, setting errno to EINVAL.
1268 *
1269 * An application can use sctp_connectx to initiate an association with
1270 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1271 * allows a caller to specify multiple addresses at which a peer can be
1272 * reached. The way the SCTP stack uses the list of addresses to set up
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001273 * the association is implementation dependent. This function only
Frank Filz3f7a87d2005-06-20 13:14:57 -07001274 * specifies that the stack will try to make use of all the addresses in
1275 * the list when needed.
1276 *
1277 * Note that the list of addresses passed in is only used for setting up
1278 * the association. It does not necessarily equal the set of addresses
1279 * the peer uses for the resulting association. If the caller wants to
1280 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1281 * retrieve them after the association has been set up.
1282 *
1283 * Basically do nothing but copying the addresses from user to kernel
1284 * land and invoking either sctp_connectx(). This is used for tunneling
1285 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1286 *
1287 * We don't use copy_from_user() for optimization: we first do the
1288 * sanity checks (buffer size -fast- and access check-healthy
1289 * pointer); if all of those succeed, then we can alloc the memory
1290 * (expensive operation) needed to copy the data to kernel. Then we do
1291 * the copying without checking the user space area
1292 * (__copy_from_user()).
1293 *
1294 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1295 * it.
1296 *
1297 * sk The sk of the socket
1298 * addrs The pointer to the addresses in user land
1299 * addrssize Size of the addrs buffer
1300 *
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001301 * Returns >=0 if ok, <0 errno code on error.
Frank Filz3f7a87d2005-06-20 13:14:57 -07001302 */
wangweidong26ac8e52013-12-23 12:16:51 +08001303static int __sctp_setsockopt_connectx(struct sock *sk,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001304 struct sockaddr __user *addrs,
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001305 int addrs_size,
1306 sctp_assoc_t *assoc_id)
Frank Filz3f7a87d2005-06-20 13:14:57 -07001307{
1308 int err = 0;
1309 struct sockaddr *kaddrs;
1310
Daniel Borkmannbb333812013-06-28 19:49:40 +02001311 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1312 __func__, sk, addrs, addrs_size);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001313
1314 if (unlikely(addrs_size <= 0))
1315 return -EINVAL;
1316
1317 /* Check the user passed a healthy pointer. */
1318 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1319 return -EFAULT;
1320
1321 /* Alloc space for the address array in kernel memory. */
Kris Katterjohn8b3a7002006-01-11 15:56:43 -08001322 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001323 if (unlikely(!kaddrs))
1324 return -ENOMEM;
1325
1326 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1327 err = -EFAULT;
1328 } else {
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001329 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001330 }
1331
1332 kfree(kaddrs);
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001333
Frank Filz3f7a87d2005-06-20 13:14:57 -07001334 return err;
1335}
1336
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001337/*
1338 * This is an older interface. It's kept for backward compatibility
1339 * to the option that doesn't provide association id.
1340 */
wangweidong26ac8e52013-12-23 12:16:51 +08001341static int sctp_setsockopt_connectx_old(struct sock *sk,
Daniel Borkmanndda91922013-06-17 11:40:05 +02001342 struct sockaddr __user *addrs,
1343 int addrs_size)
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001344{
1345 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1346}
1347
1348/*
1349 * New interface for the API. The since the API is done with a socket
1350 * option, to make it simple we feed back the association id is as a return
1351 * indication to the call. Error is always negative and association id is
1352 * always positive.
1353 */
wangweidong26ac8e52013-12-23 12:16:51 +08001354static int sctp_setsockopt_connectx(struct sock *sk,
Daniel Borkmanndda91922013-06-17 11:40:05 +02001355 struct sockaddr __user *addrs,
1356 int addrs_size)
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001357{
1358 sctp_assoc_t assoc_id = 0;
1359 int err = 0;
1360
1361 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1362
1363 if (err)
1364 return err;
1365 else
1366 return assoc_id;
1367}
1368
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001369/*
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001370 * New (hopefully final) interface for the API.
1371 * We use the sctp_getaddrs_old structure so that use-space library
Daniel Borkmannffd59392014-02-17 12:11:11 +01001372 * can avoid any unnecessary allocations. The only different part
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001373 * is that we store the actual length of the address buffer into the
Daniel Borkmannffd59392014-02-17 12:11:11 +01001374 * addrs_num structure member. That way we can re-use the existing
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001375 * code.
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001376 */
Daniel Borkmannffd59392014-02-17 12:11:11 +01001377#ifdef CONFIG_COMPAT
1378struct compat_sctp_getaddrs_old {
1379 sctp_assoc_t assoc_id;
1380 s32 addr_num;
1381 compat_uptr_t addrs; /* struct sockaddr * */
1382};
1383#endif
1384
wangweidong26ac8e52013-12-23 12:16:51 +08001385static int sctp_getsockopt_connectx3(struct sock *sk, int len,
Daniel Borkmanndda91922013-06-17 11:40:05 +02001386 char __user *optval,
1387 int __user *optlen)
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001388{
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001389 struct sctp_getaddrs_old param;
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001390 sctp_assoc_t assoc_id = 0;
1391 int err = 0;
1392
Daniel Borkmannffd59392014-02-17 12:11:11 +01001393#ifdef CONFIG_COMPAT
1394 if (is_compat_task()) {
1395 struct compat_sctp_getaddrs_old param32;
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001396
Daniel Borkmannffd59392014-02-17 12:11:11 +01001397 if (len < sizeof(param32))
1398 return -EINVAL;
1399 if (copy_from_user(&param32, optval, sizeof(param32)))
1400 return -EFAULT;
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001401
Daniel Borkmannffd59392014-02-17 12:11:11 +01001402 param.assoc_id = param32.assoc_id;
1403 param.addr_num = param32.addr_num;
1404 param.addrs = compat_ptr(param32.addrs);
1405 } else
1406#endif
1407 {
1408 if (len < sizeof(param))
1409 return -EINVAL;
1410 if (copy_from_user(&param, optval, sizeof(param)))
1411 return -EFAULT;
1412 }
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001413
Daniel Borkmannffd59392014-02-17 12:11:11 +01001414 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1415 param.addrs, param.addr_num,
1416 &assoc_id);
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001417 if (err == 0 || err == -EINPROGRESS) {
1418 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1419 return -EFAULT;
1420 if (put_user(sizeof(assoc_id), optlen))
1421 return -EFAULT;
1422 }
1423
1424 return err;
1425}
1426
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427/* API 3.1.4 close() - UDP Style Syntax
1428 * Applications use close() to perform graceful shutdown (as described in
1429 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1430 * by a UDP-style socket.
1431 *
1432 * The syntax is
1433 *
1434 * ret = close(int sd);
1435 *
1436 * sd - the socket descriptor of the associations to be closed.
1437 *
1438 * To gracefully shutdown a specific association represented by the
1439 * UDP-style socket, an application should use the sendmsg() call,
1440 * passing no user data, but including the appropriate flag in the
1441 * ancillary data (see Section xxxx).
1442 *
1443 * If sd in the close() call is a branched-off socket representing only
1444 * one association, the shutdown is performed on that association only.
1445 *
1446 * 4.1.6 close() - TCP Style Syntax
1447 *
1448 * Applications use close() to gracefully close down an association.
1449 *
1450 * The syntax is:
1451 *
1452 * int close(int sd);
1453 *
1454 * sd - the socket descriptor of the association to be closed.
1455 *
1456 * After an application calls close() on a socket descriptor, no further
1457 * socket operations will succeed on that descriptor.
1458 *
1459 * API 7.1.4 SO_LINGER
1460 *
1461 * An application using the TCP-style socket can use this option to
1462 * perform the SCTP ABORT primitive. The linger option structure is:
1463 *
1464 * struct linger {
1465 * int l_onoff; // option on/off
1466 * int l_linger; // linger time
1467 * };
1468 *
1469 * To enable the option, set l_onoff to 1. If the l_linger value is set
1470 * to 0, calling close() is the same as the ABORT primitive. If the
1471 * value is set to a negative value, the setsockopt() call will return
1472 * an error. If the value is set to a positive value linger_time, the
1473 * close() can be blocked for at most linger_time ms. If the graceful
1474 * shutdown phase does not finish during this period, close() will
1475 * return but the graceful shutdown phase continues in the system.
1476 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02001477static void sctp_close(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001479 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 struct sctp_endpoint *ep;
1481 struct sctp_association *asoc;
1482 struct list_head *pos, *temp;
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001483 unsigned int data_was_unread;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484
Daniel Borkmannbb333812013-06-28 19:49:40 +02001485 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486
wangweidong048ed4b2014-01-21 15:44:11 +08001487 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 sk->sk_shutdown = SHUTDOWN_MASK;
Vlad Yasevichbec96402009-07-30 18:08:28 -04001489 sk->sk_state = SCTP_SS_CLOSING;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490
1491 ep = sctp_sk(sk)->ep;
1492
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001493 /* Clean up any skbs sitting on the receive queue. */
1494 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1495 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1496
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07001497 /* Walk all associations on an endpoint. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 list_for_each_safe(pos, temp, &ep->asocs) {
1499 asoc = list_entry(pos, struct sctp_association, asocs);
1500
1501 if (sctp_style(sk, TCP)) {
1502 /* A closed association can still be in the list if
1503 * it belongs to a TCP-style listening socket that is
1504 * not yet accepted. If so, free it. If not, send an
1505 * ABORT or SHUTDOWN based on the linger options.
1506 */
1507 if (sctp_state(asoc, CLOSED)) {
1508 sctp_unhash_established(asoc);
1509 sctp_association_free(asoc);
Vladislav Yasevichb89498a2006-05-19 14:32:06 -07001510 continue;
1511 }
1512 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001514 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1515 !skb_queue_empty(&asoc->ulpq.reasm) ||
1516 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
Sridhar Samudralab9ac8672006-08-28 13:53:01 -07001517 struct sctp_chunk *chunk;
1518
1519 chunk = sctp_make_abort_user(asoc, NULL, 0);
1520 if (chunk)
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001521 sctp_primitive_ABORT(net, asoc, chunk);
Sridhar Samudralab9ac8672006-08-28 13:53:01 -07001522 } else
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001523 sctp_primitive_SHUTDOWN(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524 }
1525
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 /* On a TCP-style socket, block for at most linger_time if set. */
1527 if (sctp_style(sk, TCP) && timeout)
1528 sctp_wait_for_close(sk, timeout);
1529
1530 /* This will run the backlog queue. */
wangweidong048ed4b2014-01-21 15:44:11 +08001531 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532
1533 /* Supposedly, no process has access to the socket, but
1534 * the net layers still may.
1535 */
wangweidong79b91132014-01-21 15:44:07 +08001536 local_bh_disable();
wangweidong5bc1d1b2014-01-21 15:44:12 +08001537 bh_lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538
1539 /* Hold the sock, since sk_common_release() will put sock_put()
1540 * and we have just a little more cleanup.
1541 */
1542 sock_hold(sk);
1543 sk_common_release(sk);
1544
wangweidong5bc1d1b2014-01-21 15:44:12 +08001545 bh_unlock_sock(sk);
wangweidong79b91132014-01-21 15:44:07 +08001546 local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547
1548 sock_put(sk);
1549
1550 SCTP_DBG_OBJCNT_DEC(sock);
1551}
1552
1553/* Handle EPIPE error. */
1554static int sctp_error(struct sock *sk, int flags, int err)
1555{
1556 if (err == -EPIPE)
1557 err = sock_error(sk) ? : -EPIPE;
1558 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1559 send_sig(SIGPIPE, current, 0);
1560 return err;
1561}
1562
1563/* API 3.1.3 sendmsg() - UDP Style Syntax
1564 *
1565 * An application uses sendmsg() and recvmsg() calls to transmit data to
1566 * and receive data from its peer.
1567 *
1568 * ssize_t sendmsg(int socket, const struct msghdr *message,
1569 * int flags);
1570 *
1571 * socket - the socket descriptor of the endpoint.
1572 * message - pointer to the msghdr structure which contains a single
1573 * user message and possibly some ancillary data.
1574 *
1575 * See Section 5 for complete description of the data
1576 * structures.
1577 *
1578 * flags - flags sent or received with the user message, see Section
1579 * 5 for complete description of the flags.
1580 *
1581 * Note: This function could use a rewrite especially when explicit
1582 * connect support comes in.
1583 */
1584/* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1585
Daniel Borkmanndda91922013-06-17 11:40:05 +02001586static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587
Daniel Borkmanndda91922013-06-17 11:40:05 +02001588static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1589 struct msghdr *msg, size_t msg_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001591 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592 struct sctp_sock *sp;
1593 struct sctp_endpoint *ep;
wangweidongcb3f8372013-12-23 12:16:50 +08001594 struct sctp_association *new_asoc = NULL, *asoc = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595 struct sctp_transport *transport, *chunk_tp;
1596 struct sctp_chunk *chunk;
Al Virodce116a2006-11-20 17:25:15 -08001597 union sctp_addr to;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 struct sockaddr *msg_name = NULL;
Joe Perches517aa0b2011-05-12 11:27:20 +00001599 struct sctp_sndrcvinfo default_sinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 struct sctp_sndrcvinfo *sinfo;
1601 struct sctp_initmsg *sinit;
1602 sctp_assoc_t associd = 0;
1603 sctp_cmsgs_t cmsgs = { NULL };
1604 int err;
1605 sctp_scope_t scope;
1606 long timeo;
1607 __u16 sinfo_flags = 0;
1608 struct sctp_datamsg *datamsg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609 int msg_flags = msg->msg_flags;
1610
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611 err = 0;
1612 sp = sctp_sk(sk);
1613 ep = sp->ep;
1614
Daniel Borkmannbb333812013-06-28 19:49:40 +02001615 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
1616 msg, msg_len, ep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617
1618 /* We cannot send a message over a TCP-style listening socket. */
1619 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1620 err = -EPIPE;
1621 goto out_nounlock;
1622 }
1623
1624 /* Parse out the SCTP CMSGs. */
1625 err = sctp_msghdr_parse(msg, &cmsgs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626 if (err) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02001627 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 goto out_nounlock;
1629 }
1630
1631 /* Fetch the destination address for this packet. This
1632 * address only selects the association--it is not necessarily
1633 * the address we will send to.
1634 * For a peeled-off socket, msg_name is ignored.
1635 */
1636 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1637 int msg_namelen = msg->msg_namelen;
1638
1639 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1640 msg_namelen);
1641 if (err)
1642 return err;
1643
1644 if (msg_namelen > sizeof(to))
1645 msg_namelen = sizeof(to);
1646 memcpy(&to, msg->msg_name, msg_namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 msg_name = msg->msg_name;
1648 }
1649
1650 sinfo = cmsgs.info;
1651 sinit = cmsgs.init;
1652
1653 /* Did the user specify SNDRCVINFO? */
1654 if (sinfo) {
1655 sinfo_flags = sinfo->sinfo_flags;
1656 associd = sinfo->sinfo_assoc_id;
1657 }
1658
Daniel Borkmannbb333812013-06-28 19:49:40 +02001659 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
1660 msg_len, sinfo_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001662 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1663 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 err = -EINVAL;
1665 goto out_nounlock;
1666 }
1667
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001668 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1669 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1670 * If SCTP_ABORT is set, the message length could be non zero with
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 * the msg_iov set to the user abort reason.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001672 */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001673 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1674 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 err = -EINVAL;
1676 goto out_nounlock;
1677 }
1678
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001679 /* If SCTP_ADDR_OVER is set, there must be an address
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680 * specified in msg_name.
1681 */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001682 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683 err = -EINVAL;
1684 goto out_nounlock;
1685 }
1686
1687 transport = NULL;
1688
Daniel Borkmannbb333812013-06-28 19:49:40 +02001689 pr_debug("%s: about to look up association\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690
wangweidong048ed4b2014-01-21 15:44:11 +08001691 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692
1693 /* If a msg_name has been specified, assume this is to be used. */
1694 if (msg_name) {
1695 /* Look for a matching association on the endpoint. */
Al Virodce116a2006-11-20 17:25:15 -08001696 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 if (!asoc) {
1698 /* If we could not find a matching association on the
1699 * endpoint, make sure that it is not a TCP-style
1700 * socket that already has an association or there is
1701 * no peeled-off association on another socket.
1702 */
1703 if ((sctp_style(sk, TCP) &&
1704 sctp_sstate(sk, ESTABLISHED)) ||
Al Virodce116a2006-11-20 17:25:15 -08001705 sctp_endpoint_is_peeled_off(ep, &to)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706 err = -EADDRNOTAVAIL;
1707 goto out_unlock;
1708 }
1709 }
1710 } else {
1711 asoc = sctp_id2assoc(sk, associd);
1712 if (!asoc) {
1713 err = -EPIPE;
1714 goto out_unlock;
1715 }
1716 }
1717
1718 if (asoc) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02001719 pr_debug("%s: just looked up association:%p\n", __func__, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720
1721 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1722 * socket that has an association in CLOSED state. This can
1723 * happen when an accepted socket has an association that is
1724 * already CLOSED.
1725 */
1726 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1727 err = -EPIPE;
1728 goto out_unlock;
1729 }
1730
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001731 if (sinfo_flags & SCTP_EOF) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02001732 pr_debug("%s: shutting down association:%p\n",
1733 __func__, asoc);
1734
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001735 sctp_primitive_SHUTDOWN(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736 err = 0;
1737 goto out_unlock;
1738 }
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001739 if (sinfo_flags & SCTP_ABORT) {
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001740
1741 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1742 if (!chunk) {
1743 err = -ENOMEM;
1744 goto out_unlock;
1745 }
1746
Daniel Borkmannbb333812013-06-28 19:49:40 +02001747 pr_debug("%s: aborting association:%p\n",
1748 __func__, asoc);
1749
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001750 sctp_primitive_ABORT(net, asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751 err = 0;
1752 goto out_unlock;
1753 }
1754 }
1755
1756 /* Do we need to create the association? */
1757 if (!asoc) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02001758 pr_debug("%s: there is no association yet\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001760 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761 err = -EINVAL;
1762 goto out_unlock;
1763 }
1764
1765 /* Check for invalid stream against the stream counts,
1766 * either the default or the user specified stream counts.
1767 */
1768 if (sinfo) {
Dan Carpenter0e864b22014-01-13 16:46:08 +03001769 if (!sinit || !sinit->sinit_num_ostreams) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770 /* Check against the defaults. */
1771 if (sinfo->sinfo_stream >=
1772 sp->initmsg.sinit_num_ostreams) {
1773 err = -EINVAL;
1774 goto out_unlock;
1775 }
1776 } else {
1777 /* Check against the requested. */
1778 if (sinfo->sinfo_stream >=
1779 sinit->sinit_num_ostreams) {
1780 err = -EINVAL;
1781 goto out_unlock;
1782 }
1783 }
1784 }
1785
1786 /*
1787 * API 3.1.2 bind() - UDP Style Syntax
1788 * If a bind() or sctp_bindx() is not called prior to a
1789 * sendmsg() call that initiates a new association, the
1790 * system picks an ephemeral port and will choose an address
1791 * set equivalent to binding with a wildcard address.
1792 */
1793 if (!ep->base.bind_addr.port) {
1794 if (sctp_autobind(sk)) {
1795 err = -EAGAIN;
1796 goto out_unlock;
1797 }
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001798 } else {
1799 /*
1800 * If an unprivileged user inherits a one-to-many
1801 * style socket with open associations on a privileged
1802 * port, it MAY be permitted to accept new associations,
1803 * but it SHOULD NOT be permitted to open new
1804 * associations.
1805 */
1806 if (ep->base.bind_addr.port < PROT_SOCK &&
Eric W. Biederman35946982012-11-16 03:03:12 +00001807 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001808 err = -EACCES;
1809 goto out_unlock;
1810 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 }
1812
1813 scope = sctp_scope(&to);
1814 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1815 if (!new_asoc) {
1816 err = -ENOMEM;
1817 goto out_unlock;
1818 }
1819 asoc = new_asoc;
Vlad Yasevich409b95a2009-11-10 08:57:34 +00001820 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1821 if (err < 0) {
1822 err = -ENOMEM;
1823 goto out_free;
1824 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825
1826 /* If the SCTP_INIT ancillary data is specified, set all
1827 * the association init values accordingly.
1828 */
1829 if (sinit) {
1830 if (sinit->sinit_num_ostreams) {
1831 asoc->c.sinit_num_ostreams =
1832 sinit->sinit_num_ostreams;
1833 }
1834 if (sinit->sinit_max_instreams) {
1835 asoc->c.sinit_max_instreams =
1836 sinit->sinit_max_instreams;
1837 }
1838 if (sinit->sinit_max_attempts) {
1839 asoc->max_init_attempts
1840 = sinit->sinit_max_attempts;
1841 }
1842 if (sinit->sinit_max_init_timeo) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001843 asoc->max_init_timeo =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1845 }
1846 }
1847
1848 /* Prime the peer's transport structures. */
Al Virodce116a2006-11-20 17:25:15 -08001849 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850 if (!transport) {
1851 err = -ENOMEM;
1852 goto out_free;
1853 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854 }
1855
1856 /* ASSERT: we have a valid association at this point. */
Daniel Borkmannbb333812013-06-28 19:49:40 +02001857 pr_debug("%s: we have a valid association\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858
1859 if (!sinfo) {
1860 /* If the user didn't specify SNDRCVINFO, make up one with
1861 * some defaults.
1862 */
Joe Perches517aa0b2011-05-12 11:27:20 +00001863 memset(&default_sinfo, 0, sizeof(default_sinfo));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864 default_sinfo.sinfo_stream = asoc->default_stream;
1865 default_sinfo.sinfo_flags = asoc->default_flags;
1866 default_sinfo.sinfo_ppid = asoc->default_ppid;
1867 default_sinfo.sinfo_context = asoc->default_context;
1868 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1869 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1870 sinfo = &default_sinfo;
1871 }
1872
1873 /* API 7.1.7, the sndbuf size per association bounds the
1874 * maximum size of data that can be sent in a single send call.
1875 */
1876 if (msg_len > sk->sk_sndbuf) {
1877 err = -EMSGSIZE;
1878 goto out_free;
1879 }
1880
Vlad Yasevich8a479492007-06-07 14:21:05 -04001881 if (asoc->pmtu_pending)
David S. Miller02f3d4c2012-07-16 03:57:14 -07001882 sctp_assoc_pending_pmtu(sk, asoc);
Vlad Yasevich8a479492007-06-07 14:21:05 -04001883
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884 /* If fragmentation is disabled and the message length exceeds the
1885 * association fragmentation point, return EMSGSIZE. The I-D
1886 * does not specify what this error is, but this looks like
1887 * a great fit.
1888 */
1889 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1890 err = -EMSGSIZE;
1891 goto out_free;
1892 }
1893
Joe Perchesafd76142011-05-12 09:19:10 +00001894 /* Check for invalid stream. */
1895 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1896 err = -EINVAL;
1897 goto out_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898 }
1899
1900 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1901 if (!sctp_wspace(asoc)) {
1902 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1903 if (err)
1904 goto out_free;
1905 }
1906
1907 /* If an address is passed with the sendto/sendmsg call, it is used
1908 * to override the primary destination address in the TCP model, or
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001909 * when SCTP_ADDR_OVER flag is set in the UDP model.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910 */
1911 if ((sctp_style(sk, TCP) && msg_name) ||
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001912 (sinfo_flags & SCTP_ADDR_OVER)) {
Al Virodce116a2006-11-20 17:25:15 -08001913 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 if (!chunk_tp) {
1915 err = -EINVAL;
1916 goto out_free;
1917 }
1918 } else
1919 chunk_tp = NULL;
1920
1921 /* Auto-connect, if we aren't connected already. */
1922 if (sctp_state(asoc, CLOSED)) {
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001923 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 if (err < 0)
1925 goto out_free;
Daniel Borkmannbb333812013-06-28 19:49:40 +02001926
1927 pr_debug("%s: we associated primitively\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928 }
1929
1930 /* Break the message into multiple chunks of maximum size. */
1931 datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
Tommi Rantala6e51fe72012-11-22 03:23:16 +00001932 if (IS_ERR(datamsg)) {
1933 err = PTR_ERR(datamsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934 goto out_free;
1935 }
1936
1937 /* Now send the (possibly) fragmented message. */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07001938 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
Florian Westphal80445cf2008-03-23 22:47:08 -07001939 sctp_chunk_hold(chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940
1941 /* Do accounting for the write space. */
1942 sctp_set_owner_w(chunk);
1943
1944 chunk->transport = chunk_tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945 }
1946
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001947 /* Send it to the lower layers. Note: all chunks
1948 * must either fail or succeed. The lower layer
1949 * works that way today. Keep it that way or this
1950 * breaks.
1951 */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001952 err = sctp_primitive_SEND(net, asoc, datamsg);
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001953 /* Did the lower layer accept the chunk? */
Daniel Borkmannbb333812013-06-28 19:49:40 +02001954 if (err) {
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001955 sctp_datamsg_free(datamsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956 goto out_free;
Daniel Borkmannbb333812013-06-28 19:49:40 +02001957 }
1958
1959 pr_debug("%s: we sent primitively\n", __func__);
1960
1961 sctp_datamsg_put(datamsg);
1962 err = msg_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963
1964 /* If we are already past ASSOCIATE, the lower
1965 * layers are responsible for association cleanup.
1966 */
1967 goto out_unlock;
1968
1969out_free:
Neil Horman2eebc1e2012-07-16 09:13:51 +00001970 if (new_asoc) {
1971 sctp_unhash_established(asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 sctp_association_free(asoc);
Neil Horman2eebc1e2012-07-16 09:13:51 +00001973 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974out_unlock:
wangweidong048ed4b2014-01-21 15:44:11 +08001975 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976
1977out_nounlock:
1978 return sctp_error(sk, msg_flags, err);
1979
1980#if 0
1981do_sock_err:
1982 if (msg_len)
1983 err = msg_len;
1984 else
1985 err = sock_error(sk);
1986 goto out;
1987
1988do_interrupted:
1989 if (msg_len)
1990 err = msg_len;
1991 goto out;
1992#endif /* 0 */
1993}
1994
1995/* This is an extended version of skb_pull() that removes the data from the
1996 * start of a skb even when data is spread across the list of skb's in the
1997 * frag_list. len specifies the total amount of data that needs to be removed.
1998 * when 'len' bytes could be removed from the skb, it returns 0.
1999 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2000 * could not be removed.
2001 */
2002static int sctp_skb_pull(struct sk_buff *skb, int len)
2003{
2004 struct sk_buff *list;
2005 int skb_len = skb_headlen(skb);
2006 int rlen;
2007
2008 if (len <= skb_len) {
2009 __skb_pull(skb, len);
2010 return 0;
2011 }
2012 len -= skb_len;
2013 __skb_pull(skb, skb_len);
2014
David S. Miller1b003be2009-06-09 00:22:35 -07002015 skb_walk_frags(skb, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016 rlen = sctp_skb_pull(list, len);
2017 skb->len -= (len-rlen);
2018 skb->data_len -= (len-rlen);
2019
2020 if (!rlen)
2021 return 0;
2022
2023 len = rlen;
2024 }
2025
2026 return len;
2027}
2028
2029/* API 3.1.3 recvmsg() - UDP Style Syntax
2030 *
2031 * ssize_t recvmsg(int socket, struct msghdr *message,
2032 * int flags);
2033 *
2034 * socket - the socket descriptor of the endpoint.
2035 * message - pointer to the msghdr structure which contains a single
2036 * user message and possibly some ancillary data.
2037 *
2038 * See Section 5 for complete description of the data
2039 * structures.
2040 *
2041 * flags - flags sent or received with the user message, see Section
2042 * 5 for complete description of the flags.
2043 */
2044static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
2045
Daniel Borkmanndda91922013-06-17 11:40:05 +02002046static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
2047 struct msghdr *msg, size_t len, int noblock,
2048 int flags, int *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049{
2050 struct sctp_ulpevent *event = NULL;
2051 struct sctp_sock *sp = sctp_sk(sk);
2052 struct sk_buff *skb;
2053 int copied;
2054 int err = 0;
2055 int skb_len;
2056
Daniel Borkmannbb333812013-06-28 19:49:40 +02002057 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2058 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2059 addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060
wangweidong048ed4b2014-01-21 15:44:11 +08002061 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062
2063 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2064 err = -ENOTCONN;
2065 goto out;
2066 }
2067
2068 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2069 if (!skb)
2070 goto out;
2071
2072 /* Get the total length of the skb including any skb's in the
2073 * frag_list.
2074 */
2075 skb_len = skb->len;
2076
2077 copied = skb_len;
2078 if (copied > len)
2079 copied = len;
2080
2081 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2082
2083 event = sctp_skb2event(skb);
2084
2085 if (err)
2086 goto out_free;
2087
Neil Horman3b885782009-10-12 13:26:31 -07002088 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089 if (sctp_ulpevent_is_notification(event)) {
2090 msg->msg_flags |= MSG_NOTIFICATION;
2091 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2092 } else {
2093 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2094 }
2095
2096 /* Check if we allow SCTP_SNDRCVINFO. */
2097 if (sp->subscribe.sctp_data_io_event)
2098 sctp_ulpevent_read_sndrcvinfo(event, msg);
2099#if 0
2100 /* FIXME: we should be calling IP/IPv6 layers. */
2101 if (sk->sk_protinfo.af_inet.cmsg_flags)
2102 ip_cmsg_recv(msg, skb);
2103#endif
2104
2105 err = copied;
2106
2107 /* If skb's length exceeds the user's buffer, update the skb and
2108 * push it back to the receive_queue so that the next call to
2109 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2110 */
2111 if (skb_len > copied) {
2112 msg->msg_flags &= ~MSG_EOR;
2113 if (flags & MSG_PEEK)
2114 goto out_free;
2115 sctp_skb_pull(skb, copied);
2116 skb_queue_head(&sk->sk_receive_queue, skb);
2117
Daniel Borkmann362d5202014-04-14 21:45:17 +02002118 /* When only partial message is copied to the user, increase
2119 * rwnd by that amount. If all the data in the skb is read,
2120 * rwnd is updated when the event is freed.
2121 */
2122 if (!sctp_ulpevent_is_notification(event))
2123 sctp_assoc_rwnd_increase(event->asoc, copied);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124 goto out;
2125 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2126 (event->msg_flags & MSG_EOR))
2127 msg->msg_flags |= MSG_EOR;
2128 else
2129 msg->msg_flags &= ~MSG_EOR;
2130
2131out_free:
2132 if (flags & MSG_PEEK) {
2133 /* Release the skb reference acquired after peeking the skb in
2134 * sctp_skb_recv_datagram().
2135 */
2136 kfree_skb(skb);
2137 } else {
2138 /* Free the event which includes releasing the reference to
2139 * the owner of the skb, freeing the skb and updating the
2140 * rwnd.
2141 */
2142 sctp_ulpevent_free(event);
2143 }
2144out:
wangweidong048ed4b2014-01-21 15:44:11 +08002145 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002146 return err;
2147}
2148
2149/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2150 *
2151 * This option is a on/off flag. If enabled no SCTP message
2152 * fragmentation will be performed. Instead if a message being sent
2153 * exceeds the current PMTU size, the message will NOT be sent and
2154 * instead a error will be indicated to the user.
2155 */
2156static int sctp_setsockopt_disable_fragments(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002157 char __user *optval,
2158 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159{
2160 int val;
2161
2162 if (optlen < sizeof(int))
2163 return -EINVAL;
2164
2165 if (get_user(val, (int __user *)optval))
2166 return -EFAULT;
2167
2168 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2169
2170 return 0;
2171}
2172
2173static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002174 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175{
Wei Yongjun94912302011-07-02 09:28:04 +00002176 struct sctp_association *asoc;
2177 struct sctp_ulpevent *event;
2178
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05002179 if (optlen > sizeof(struct sctp_event_subscribe))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180 return -EINVAL;
2181 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2182 return -EFAULT;
Wei Yongjun94912302011-07-02 09:28:04 +00002183
2184 /*
2185 * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2186 * if there is no data to be sent or retransmit, the stack will
2187 * immediately send up this notification.
2188 */
2189 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2190 &sctp_sk(sk)->subscribe)) {
2191 asoc = sctp_id2assoc(sk, 0);
2192
2193 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2194 event = sctp_ulpevent_make_sender_dry_event(asoc,
2195 GFP_ATOMIC);
2196 if (!event)
2197 return -ENOMEM;
2198
2199 sctp_ulpq_tail_event(&asoc->ulpq, event);
2200 }
2201 }
2202
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203 return 0;
2204}
2205
2206/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2207 *
2208 * This socket option is applicable to the UDP-style socket only. When
2209 * set it will cause associations that are idle for more than the
2210 * specified number of seconds to automatically close. An association
2211 * being idle is defined an association that has NOT sent or received
2212 * user data. The special value of '0' indicates that no automatic
2213 * close of any associations should be performed. The option expects an
2214 * integer defining the number of seconds of idle time before an
2215 * association is closed.
2216 */
2217static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002218 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002219{
2220 struct sctp_sock *sp = sctp_sk(sk);
Neil Horman9f70f462013-12-10 06:48:15 -05002221 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222
2223 /* Applicable to UDP-style socket only */
2224 if (sctp_style(sk, TCP))
2225 return -EOPNOTSUPP;
2226 if (optlen != sizeof(int))
2227 return -EINVAL;
2228 if (copy_from_user(&sp->autoclose, optval, optlen))
2229 return -EFAULT;
2230
Neil Horman9f70f462013-12-10 06:48:15 -05002231 if (sp->autoclose > net->sctp.max_autoclose)
2232 sp->autoclose = net->sctp.max_autoclose;
2233
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234 return 0;
2235}
2236
2237/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2238 *
2239 * Applications can enable or disable heartbeats for any peer address of
2240 * an association, modify an address's heartbeat interval, force a
2241 * heartbeat to be sent immediately, and adjust the address's maximum
2242 * number of retransmissions sent before an address is considered
2243 * unreachable. The following structure is used to access and modify an
2244 * address's parameters:
2245 *
2246 * struct sctp_paddrparams {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002247 * sctp_assoc_t spp_assoc_id;
2248 * struct sockaddr_storage spp_address;
2249 * uint32_t spp_hbinterval;
2250 * uint16_t spp_pathmaxrxt;
2251 * uint32_t spp_pathmtu;
2252 * uint32_t spp_sackdelay;
2253 * uint32_t spp_flags;
2254 * };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002255 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08002256 * spp_assoc_id - (one-to-many style socket) This is filled in the
2257 * application, and identifies the association for
2258 * this query.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002259 * spp_address - This specifies which address is of interest.
2260 * spp_hbinterval - This contains the value of the heartbeat interval,
Frank Filz52ccb8e2005-12-22 11:36:46 -08002261 * in milliseconds. If a value of zero
2262 * is present in this field then no changes are to
2263 * be made to this parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264 * spp_pathmaxrxt - This contains the maximum number of
2265 * retransmissions before this address shall be
Frank Filz52ccb8e2005-12-22 11:36:46 -08002266 * considered unreachable. If a value of zero
2267 * is present in this field then no changes are to
2268 * be made to this parameter.
2269 * spp_pathmtu - When Path MTU discovery is disabled the value
2270 * specified here will be the "fixed" path mtu.
2271 * Note that if the spp_address field is empty
2272 * then all associations on this address will
2273 * have this fixed path mtu set upon them.
2274 *
2275 * spp_sackdelay - When delayed sack is enabled, this value specifies
2276 * the number of milliseconds that sacks will be delayed
2277 * for. This value will apply to all addresses of an
2278 * association if the spp_address field is empty. Note
2279 * also, that if delayed sack is enabled and this
2280 * value is set to 0, no change is made to the last
2281 * recorded delayed sack timer value.
2282 *
2283 * spp_flags - These flags are used to control various features
2284 * on an association. The flag field may contain
2285 * zero or more of the following options.
2286 *
2287 * SPP_HB_ENABLE - Enable heartbeats on the
2288 * specified address. Note that if the address
2289 * field is empty all addresses for the association
2290 * have heartbeats enabled upon them.
2291 *
2292 * SPP_HB_DISABLE - Disable heartbeats on the
2293 * speicifed address. Note that if the address
2294 * field is empty all addresses for the association
2295 * will have their heartbeats disabled. Note also
2296 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2297 * mutually exclusive, only one of these two should
2298 * be specified. Enabling both fields will have
2299 * undetermined results.
2300 *
2301 * SPP_HB_DEMAND - Request a user initiated heartbeat
2302 * to be made immediately.
2303 *
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002304 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2305 * heartbeat delayis to be set to the value of 0
2306 * milliseconds.
2307 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08002308 * SPP_PMTUD_ENABLE - This field will enable PMTU
2309 * discovery upon the specified address. Note that
2310 * if the address feild is empty then all addresses
2311 * on the association are effected.
2312 *
2313 * SPP_PMTUD_DISABLE - This field will disable PMTU
2314 * discovery upon the specified address. Note that
2315 * if the address feild is empty then all addresses
2316 * on the association are effected. Not also that
2317 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2318 * exclusive. Enabling both will have undetermined
2319 * results.
2320 *
2321 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2322 * on delayed sack. The time specified in spp_sackdelay
2323 * is used to specify the sack delay for this address. Note
2324 * that if spp_address is empty then all addresses will
2325 * enable delayed sack and take on the sack delay
2326 * value specified in spp_sackdelay.
2327 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2328 * off delayed sack. If the spp_address field is blank then
2329 * delayed sack is disabled for the entire association. Note
2330 * also that this field is mutually exclusive to
2331 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2332 * results.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002333 */
Adrian Bunk16164362006-09-18 00:40:38 -07002334static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2335 struct sctp_transport *trans,
2336 struct sctp_association *asoc,
2337 struct sctp_sock *sp,
2338 int hb_change,
2339 int pmtud_change,
2340 int sackdelay_change)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002341{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002342 int error;
2343
Frank Filz52ccb8e2005-12-22 11:36:46 -08002344 if (params->spp_flags & SPP_HB_DEMAND && trans) {
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00002345 struct net *net = sock_net(trans->asoc->base.sk);
2346
2347 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348 if (error)
2349 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002350 }
2351
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002352 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2353 * this field is ignored. Note also that a value of zero indicates
2354 * the current setting should be left unchanged.
2355 */
2356 if (params->spp_flags & SPP_HB_ENABLE) {
2357
2358 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2359 * set. This lets us use 0 value when this flag
2360 * is set.
2361 */
2362 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2363 params->spp_hbinterval = 0;
2364
2365 if (params->spp_hbinterval ||
2366 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2367 if (trans) {
2368 trans->hbinterval =
2369 msecs_to_jiffies(params->spp_hbinterval);
2370 } else if (asoc) {
2371 asoc->hbinterval =
2372 msecs_to_jiffies(params->spp_hbinterval);
2373 } else {
2374 sp->hbinterval = params->spp_hbinterval;
2375 }
Frank Filz52ccb8e2005-12-22 11:36:46 -08002376 }
2377 }
2378
2379 if (hb_change) {
2380 if (trans) {
2381 trans->param_flags =
2382 (trans->param_flags & ~SPP_HB) | hb_change;
2383 } else if (asoc) {
2384 asoc->param_flags =
2385 (asoc->param_flags & ~SPP_HB) | hb_change;
2386 } else {
2387 sp->param_flags =
2388 (sp->param_flags & ~SPP_HB) | hb_change;
2389 }
2390 }
2391
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002392 /* When Path MTU discovery is disabled the value specified here will
2393 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2394 * include the flag SPP_PMTUD_DISABLE for this field to have any
2395 * effect).
2396 */
2397 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002398 if (trans) {
2399 trans->pathmtu = params->spp_pathmtu;
David S. Miller02f3d4c2012-07-16 03:57:14 -07002400 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
Frank Filz52ccb8e2005-12-22 11:36:46 -08002401 } else if (asoc) {
2402 asoc->pathmtu = params->spp_pathmtu;
Vlad Yasevichf68b2e02009-09-04 18:21:00 -04002403 sctp_frag_point(asoc, params->spp_pathmtu);
Frank Filz52ccb8e2005-12-22 11:36:46 -08002404 } else {
2405 sp->pathmtu = params->spp_pathmtu;
2406 }
2407 }
2408
2409 if (pmtud_change) {
2410 if (trans) {
2411 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2412 (params->spp_flags & SPP_PMTUD_ENABLE);
2413 trans->param_flags =
2414 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2415 if (update) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +00002416 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
David S. Miller02f3d4c2012-07-16 03:57:14 -07002417 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
Frank Filz52ccb8e2005-12-22 11:36:46 -08002418 }
2419 } else if (asoc) {
2420 asoc->param_flags =
2421 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2422 } else {
2423 sp->param_flags =
2424 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2425 }
2426 }
2427
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002428 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2429 * value of this field is ignored. Note also that a value of zero
2430 * indicates the current setting should be left unchanged.
2431 */
2432 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002433 if (trans) {
2434 trans->sackdelay =
2435 msecs_to_jiffies(params->spp_sackdelay);
2436 } else if (asoc) {
2437 asoc->sackdelay =
2438 msecs_to_jiffies(params->spp_sackdelay);
2439 } else {
2440 sp->sackdelay = params->spp_sackdelay;
2441 }
2442 }
2443
2444 if (sackdelay_change) {
2445 if (trans) {
2446 trans->param_flags =
2447 (trans->param_flags & ~SPP_SACKDELAY) |
2448 sackdelay_change;
2449 } else if (asoc) {
2450 asoc->param_flags =
2451 (asoc->param_flags & ~SPP_SACKDELAY) |
2452 sackdelay_change;
2453 } else {
2454 sp->param_flags =
2455 (sp->param_flags & ~SPP_SACKDELAY) |
2456 sackdelay_change;
2457 }
2458 }
2459
Andrei Pelinescu-Onciul37051f72009-11-23 15:53:57 -05002460 /* Note that a value of zero indicates the current setting should be
2461 left unchanged.
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002462 */
Andrei Pelinescu-Onciul37051f72009-11-23 15:53:57 -05002463 if (params->spp_pathmaxrxt) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002464 if (trans) {
2465 trans->pathmaxrxt = params->spp_pathmaxrxt;
2466 } else if (asoc) {
2467 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2468 } else {
2469 sp->pathmaxrxt = params->spp_pathmaxrxt;
2470 }
2471 }
2472
2473 return 0;
2474}
2475
2476static int sctp_setsockopt_peer_addr_params(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002477 char __user *optval,
2478 unsigned int optlen)
Frank Filz52ccb8e2005-12-22 11:36:46 -08002479{
2480 struct sctp_paddrparams params;
2481 struct sctp_transport *trans = NULL;
2482 struct sctp_association *asoc = NULL;
2483 struct sctp_sock *sp = sctp_sk(sk);
2484 int error;
2485 int hb_change, pmtud_change, sackdelay_change;
2486
2487 if (optlen != sizeof(struct sctp_paddrparams))
wangweidongcb3f8372013-12-23 12:16:50 +08002488 return -EINVAL;
Frank Filz52ccb8e2005-12-22 11:36:46 -08002489
2490 if (copy_from_user(&params, optval, optlen))
2491 return -EFAULT;
2492
2493 /* Validate flags and value parameters. */
2494 hb_change = params.spp_flags & SPP_HB;
2495 pmtud_change = params.spp_flags & SPP_PMTUD;
2496 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2497
2498 if (hb_change == SPP_HB ||
2499 pmtud_change == SPP_PMTUD ||
2500 sackdelay_change == SPP_SACKDELAY ||
2501 params.spp_sackdelay > 500 ||
Joe Perchesf64f9e72009-11-29 16:55:45 -08002502 (params.spp_pathmtu &&
2503 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
Frank Filz52ccb8e2005-12-22 11:36:46 -08002504 return -EINVAL;
2505
2506 /* If an address other than INADDR_ANY is specified, and
2507 * no transport is found, then the request is invalid.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002508 */
wangweidongcb3f8372013-12-23 12:16:50 +08002509 if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002510 trans = sctp_addr_id2transport(sk, &params.spp_address,
2511 params.spp_assoc_id);
2512 if (!trans)
2513 return -EINVAL;
2514 }
2515
2516 /* Get association, if assoc_id != 0 and the socket is a one
2517 * to many style socket, and an association was not found, then
2518 * the id was invalid.
2519 */
2520 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2521 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2522 return -EINVAL;
2523
2524 /* Heartbeat demand can only be sent on a transport or
2525 * association, but not a socket.
2526 */
2527 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2528 return -EINVAL;
2529
2530 /* Process parameters. */
2531 error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2532 hb_change, pmtud_change,
2533 sackdelay_change);
2534
2535 if (error)
2536 return error;
2537
2538 /* If changes are for association, also apply parameters to each
2539 * transport.
2540 */
2541 if (!trans && asoc) {
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002542 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2543 transports) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002544 sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2545 hb_change, pmtud_change,
2546 sackdelay_change);
2547 }
2548 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002549
2550 return 0;
2551}
2552
wangweidong0ea5e4d2014-01-15 17:24:01 +08002553static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2554{
2555 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2556}
2557
2558static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2559{
2560 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2561}
2562
Wei Yongjund364d922008-05-09 15:13:26 -07002563/*
2564 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
Frank Filz77086102005-12-22 11:37:30 -08002565 *
Wei Yongjund364d922008-05-09 15:13:26 -07002566 * This option will effect the way delayed acks are performed. This
2567 * option allows you to get or set the delayed ack time, in
2568 * milliseconds. It also allows changing the delayed ack frequency.
2569 * Changing the frequency to 1 disables the delayed sack algorithm. If
2570 * the assoc_id is 0, then this sets or gets the endpoints default
2571 * values. If the assoc_id field is non-zero, then the set or get
2572 * effects the specified association for the one to many model (the
2573 * assoc_id field is ignored by the one to one model). Note that if
2574 * sack_delay or sack_freq are 0 when setting this option, then the
2575 * current values will remain unchanged.
Frank Filz77086102005-12-22 11:37:30 -08002576 *
Wei Yongjund364d922008-05-09 15:13:26 -07002577 * struct sctp_sack_info {
2578 * sctp_assoc_t sack_assoc_id;
2579 * uint32_t sack_delay;
2580 * uint32_t sack_freq;
2581 * };
Frank Filz77086102005-12-22 11:37:30 -08002582 *
Wei Yongjund364d922008-05-09 15:13:26 -07002583 * sack_assoc_id - This parameter, indicates which association the user
2584 * is performing an action upon. Note that if this field's value is
2585 * zero then the endpoints default value is changed (effecting future
2586 * associations only).
Frank Filz77086102005-12-22 11:37:30 -08002587 *
Wei Yongjund364d922008-05-09 15:13:26 -07002588 * sack_delay - This parameter contains the number of milliseconds that
2589 * the user is requesting the delayed ACK timer be set to. Note that
2590 * this value is defined in the standard to be between 200 and 500
2591 * milliseconds.
Frank Filz77086102005-12-22 11:37:30 -08002592 *
Wei Yongjund364d922008-05-09 15:13:26 -07002593 * sack_freq - This parameter contains the number of packets that must
2594 * be received before a sack is sent without waiting for the delay
2595 * timer to expire. The default value for this is 2, setting this
2596 * value to 1 will disable the delayed sack algorithm.
Frank Filz77086102005-12-22 11:37:30 -08002597 */
2598
Wei Yongjund364d922008-05-09 15:13:26 -07002599static int sctp_setsockopt_delayed_ack(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002600 char __user *optval, unsigned int optlen)
Frank Filz77086102005-12-22 11:37:30 -08002601{
Wei Yongjund364d922008-05-09 15:13:26 -07002602 struct sctp_sack_info params;
Frank Filz77086102005-12-22 11:37:30 -08002603 struct sctp_transport *trans = NULL;
2604 struct sctp_association *asoc = NULL;
2605 struct sctp_sock *sp = sctp_sk(sk);
2606
Wei Yongjund364d922008-05-09 15:13:26 -07002607 if (optlen == sizeof(struct sctp_sack_info)) {
2608 if (copy_from_user(&params, optval, optlen))
2609 return -EFAULT;
2610
2611 if (params.sack_delay == 0 && params.sack_freq == 0)
2612 return 0;
2613 } else if (optlen == sizeof(struct sctp_assoc_value)) {
Neil Horman94f65192013-12-23 08:29:43 -05002614 pr_warn_ratelimited(DEPRECATED
Neil Hormanf916ec92014-01-02 12:54:27 -05002615 "%s (pid %d) "
Neil Horman94f65192013-12-23 08:29:43 -05002616 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
Neil Hormanf916ec92014-01-02 12:54:27 -05002617 "Use struct sctp_sack_info instead\n",
2618 current->comm, task_pid_nr(current));
Wei Yongjund364d922008-05-09 15:13:26 -07002619 if (copy_from_user(&params, optval, optlen))
2620 return -EFAULT;
2621
2622 if (params.sack_delay == 0)
2623 params.sack_freq = 1;
2624 else
2625 params.sack_freq = 0;
2626 } else
wangweidongcb3f8372013-12-23 12:16:50 +08002627 return -EINVAL;
Frank Filz77086102005-12-22 11:37:30 -08002628
Frank Filz77086102005-12-22 11:37:30 -08002629 /* Validate value parameter. */
Wei Yongjund364d922008-05-09 15:13:26 -07002630 if (params.sack_delay > 500)
Frank Filz77086102005-12-22 11:37:30 -08002631 return -EINVAL;
2632
Wei Yongjund364d922008-05-09 15:13:26 -07002633 /* Get association, if sack_assoc_id != 0 and the socket is a one
Frank Filz77086102005-12-22 11:37:30 -08002634 * to many style socket, and an association was not found, then
2635 * the id was invalid.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002636 */
Wei Yongjund364d922008-05-09 15:13:26 -07002637 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2638 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
Frank Filz77086102005-12-22 11:37:30 -08002639 return -EINVAL;
2640
Wei Yongjund364d922008-05-09 15:13:26 -07002641 if (params.sack_delay) {
Frank Filz77086102005-12-22 11:37:30 -08002642 if (asoc) {
2643 asoc->sackdelay =
Wei Yongjund364d922008-05-09 15:13:26 -07002644 msecs_to_jiffies(params.sack_delay);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002645 asoc->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002646 sctp_spp_sackdelay_enable(asoc->param_flags);
Frank Filz77086102005-12-22 11:37:30 -08002647 } else {
Wei Yongjund364d922008-05-09 15:13:26 -07002648 sp->sackdelay = params.sack_delay;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002649 sp->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002650 sctp_spp_sackdelay_enable(sp->param_flags);
Frank Filz77086102005-12-22 11:37:30 -08002651 }
Wei Yongjund364d922008-05-09 15:13:26 -07002652 }
2653
2654 if (params.sack_freq == 1) {
Frank Filz77086102005-12-22 11:37:30 -08002655 if (asoc) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002656 asoc->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002657 sctp_spp_sackdelay_disable(asoc->param_flags);
Frank Filz77086102005-12-22 11:37:30 -08002658 } else {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002659 sp->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002660 sctp_spp_sackdelay_disable(sp->param_flags);
Frank Filz77086102005-12-22 11:37:30 -08002661 }
Wei Yongjund364d922008-05-09 15:13:26 -07002662 } else if (params.sack_freq > 1) {
2663 if (asoc) {
2664 asoc->sackfreq = params.sack_freq;
2665 asoc->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002666 sctp_spp_sackdelay_enable(asoc->param_flags);
Wei Yongjund364d922008-05-09 15:13:26 -07002667 } else {
2668 sp->sackfreq = params.sack_freq;
2669 sp->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002670 sctp_spp_sackdelay_enable(sp->param_flags);
Wei Yongjund364d922008-05-09 15:13:26 -07002671 }
Frank Filz77086102005-12-22 11:37:30 -08002672 }
2673
2674 /* If change is for association, also apply to each transport. */
2675 if (asoc) {
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002676 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2677 transports) {
Wei Yongjund364d922008-05-09 15:13:26 -07002678 if (params.sack_delay) {
Frank Filz77086102005-12-22 11:37:30 -08002679 trans->sackdelay =
Wei Yongjund364d922008-05-09 15:13:26 -07002680 msecs_to_jiffies(params.sack_delay);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002681 trans->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002682 sctp_spp_sackdelay_enable(trans->param_flags);
Wei Yongjund364d922008-05-09 15:13:26 -07002683 }
Vlad Yasevich7bfe8bd2008-06-09 15:45:05 -07002684 if (params.sack_freq == 1) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002685 trans->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002686 sctp_spp_sackdelay_disable(trans->param_flags);
Wei Yongjund364d922008-05-09 15:13:26 -07002687 } else if (params.sack_freq > 1) {
2688 trans->sackfreq = params.sack_freq;
2689 trans->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002690 sctp_spp_sackdelay_enable(trans->param_flags);
Frank Filz77086102005-12-22 11:37:30 -08002691 }
2692 }
2693 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002694
Frank Filz77086102005-12-22 11:37:30 -08002695 return 0;
2696}
2697
Linus Torvalds1da177e2005-04-16 15:20:36 -07002698/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2699 *
2700 * Applications can specify protocol parameters for the default association
2701 * initialization. The option name argument to setsockopt() and getsockopt()
2702 * is SCTP_INITMSG.
2703 *
2704 * Setting initialization parameters is effective only on an unconnected
2705 * socket (for UDP-style sockets only future associations are effected
2706 * by the change). With TCP-style sockets, this option is inherited by
2707 * sockets derived from a listener socket.
2708 */
David S. Millerb7058842009-09-30 16:12:20 -07002709static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002710{
2711 struct sctp_initmsg sinit;
2712 struct sctp_sock *sp = sctp_sk(sk);
2713
2714 if (optlen != sizeof(struct sctp_initmsg))
2715 return -EINVAL;
2716 if (copy_from_user(&sinit, optval, optlen))
2717 return -EFAULT;
2718
2719 if (sinit.sinit_num_ostreams)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002720 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002721 if (sinit.sinit_max_instreams)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002722 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002723 if (sinit.sinit_max_attempts)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002724 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002725 if (sinit.sinit_max_init_timeo)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002726 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002727
2728 return 0;
2729}
2730
2731/*
2732 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2733 *
2734 * Applications that wish to use the sendto() system call may wish to
2735 * specify a default set of parameters that would normally be supplied
2736 * through the inclusion of ancillary data. This socket option allows
2737 * such an application to set the default sctp_sndrcvinfo structure.
2738 * The application that wishes to use this socket option simply passes
2739 * in to this call the sctp_sndrcvinfo structure defined in Section
2740 * 5.2.2) The input parameters accepted by this call include
2741 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2742 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2743 * to this call if the caller is using the UDP model.
2744 */
2745static int sctp_setsockopt_default_send_param(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002746 char __user *optval,
2747 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002748{
2749 struct sctp_sndrcvinfo info;
2750 struct sctp_association *asoc;
2751 struct sctp_sock *sp = sctp_sk(sk);
2752
2753 if (optlen != sizeof(struct sctp_sndrcvinfo))
2754 return -EINVAL;
2755 if (copy_from_user(&info, optval, optlen))
2756 return -EFAULT;
2757
2758 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2759 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2760 return -EINVAL;
2761
2762 if (asoc) {
2763 asoc->default_stream = info.sinfo_stream;
2764 asoc->default_flags = info.sinfo_flags;
2765 asoc->default_ppid = info.sinfo_ppid;
2766 asoc->default_context = info.sinfo_context;
2767 asoc->default_timetolive = info.sinfo_timetolive;
2768 } else {
2769 sp->default_stream = info.sinfo_stream;
2770 sp->default_flags = info.sinfo_flags;
2771 sp->default_ppid = info.sinfo_ppid;
2772 sp->default_context = info.sinfo_context;
2773 sp->default_timetolive = info.sinfo_timetolive;
2774 }
2775
2776 return 0;
2777}
2778
2779/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2780 *
2781 * Requests that the local SCTP stack use the enclosed peer address as
2782 * the association primary. The enclosed address must be one of the
2783 * association peer's addresses.
2784 */
2785static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002786 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002787{
2788 struct sctp_prim prim;
2789 struct sctp_transport *trans;
2790
2791 if (optlen != sizeof(struct sctp_prim))
2792 return -EINVAL;
2793
2794 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2795 return -EFAULT;
2796
2797 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2798 if (!trans)
2799 return -EINVAL;
2800
2801 sctp_assoc_set_primary(trans->asoc, trans);
2802
2803 return 0;
2804}
2805
2806/*
2807 * 7.1.5 SCTP_NODELAY
2808 *
2809 * Turn on/off any Nagle-like algorithm. This means that packets are
2810 * generally sent as soon as possible and no unnecessary delays are
2811 * introduced, at the cost of more packets in the network. Expects an
2812 * integer boolean flag.
2813 */
2814static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002815 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002816{
2817 int val;
2818
2819 if (optlen < sizeof(int))
2820 return -EINVAL;
2821 if (get_user(val, (int __user *)optval))
2822 return -EFAULT;
2823
2824 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2825 return 0;
2826}
2827
2828/*
2829 *
2830 * 7.1.1 SCTP_RTOINFO
2831 *
2832 * The protocol parameters used to initialize and bound retransmission
2833 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2834 * and modify these parameters.
2835 * All parameters are time values, in milliseconds. A value of 0, when
2836 * modifying the parameters, indicates that the current value should not
2837 * be changed.
2838 *
2839 */
David S. Millerb7058842009-09-30 16:12:20 -07002840static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2841{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002842 struct sctp_rtoinfo rtoinfo;
2843 struct sctp_association *asoc;
wangweidong85f935d2013-12-11 09:50:38 +08002844 unsigned long rto_min, rto_max;
2845 struct sctp_sock *sp = sctp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002846
2847 if (optlen != sizeof (struct sctp_rtoinfo))
2848 return -EINVAL;
2849
2850 if (copy_from_user(&rtoinfo, optval, optlen))
2851 return -EFAULT;
2852
2853 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2854
2855 /* Set the values to the specific association */
2856 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2857 return -EINVAL;
2858
wangweidong85f935d2013-12-11 09:50:38 +08002859 rto_max = rtoinfo.srto_max;
2860 rto_min = rtoinfo.srto_min;
2861
2862 if (rto_max)
2863 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
2864 else
2865 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
2866
2867 if (rto_min)
2868 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
2869 else
2870 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
2871
2872 if (rto_min > rto_max)
2873 return -EINVAL;
2874
Linus Torvalds1da177e2005-04-16 15:20:36 -07002875 if (asoc) {
2876 if (rtoinfo.srto_initial != 0)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002877 asoc->rto_initial =
Linus Torvalds1da177e2005-04-16 15:20:36 -07002878 msecs_to_jiffies(rtoinfo.srto_initial);
wangweidong85f935d2013-12-11 09:50:38 +08002879 asoc->rto_max = rto_max;
2880 asoc->rto_min = rto_min;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002881 } else {
2882 /* If there is no association or the association-id = 0
2883 * set the values to the endpoint.
2884 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002885 if (rtoinfo.srto_initial != 0)
2886 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
wangweidong85f935d2013-12-11 09:50:38 +08002887 sp->rtoinfo.srto_max = rto_max;
2888 sp->rtoinfo.srto_min = rto_min;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002889 }
2890
2891 return 0;
2892}
2893
2894/*
2895 *
2896 * 7.1.2 SCTP_ASSOCINFO
2897 *
Michael Opdenacker59c51592007-05-09 08:57:56 +02002898 * This option is used to tune the maximum retransmission attempts
Linus Torvalds1da177e2005-04-16 15:20:36 -07002899 * of the association.
2900 * Returns an error if the new association retransmission value is
2901 * greater than the sum of the retransmission value of the peer.
2902 * See [SCTP] for more information.
2903 *
2904 */
David S. Millerb7058842009-09-30 16:12:20 -07002905static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002906{
2907
2908 struct sctp_assocparams assocparams;
2909 struct sctp_association *asoc;
2910
2911 if (optlen != sizeof(struct sctp_assocparams))
2912 return -EINVAL;
2913 if (copy_from_user(&assocparams, optval, optlen))
2914 return -EFAULT;
2915
2916 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2917
2918 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2919 return -EINVAL;
2920
2921 /* Set the values to the specific association */
2922 if (asoc) {
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002923 if (assocparams.sasoc_asocmaxrxt != 0) {
2924 __u32 path_sum = 0;
2925 int paths = 0;
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002926 struct sctp_transport *peer_addr;
2927
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002928 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2929 transports) {
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002930 path_sum += peer_addr->pathmaxrxt;
2931 paths++;
2932 }
2933
Frederik Schwarzer025dfda2008-10-16 19:02:37 +02002934 /* Only validate asocmaxrxt if we have more than
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002935 * one path/transport. We do this because path
2936 * retransmissions are only counted when we have more
2937 * then one path.
2938 */
2939 if (paths > 1 &&
2940 assocparams.sasoc_asocmaxrxt > path_sum)
2941 return -EINVAL;
2942
Linus Torvalds1da177e2005-04-16 15:20:36 -07002943 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002944 }
2945
Daniel Borkmann52db8822013-06-25 18:17:27 +02002946 if (assocparams.sasoc_cookie_life != 0)
2947 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002948 } else {
2949 /* Set the values to the endpoint */
2950 struct sctp_sock *sp = sctp_sk(sk);
2951
2952 if (assocparams.sasoc_asocmaxrxt != 0)
2953 sp->assocparams.sasoc_asocmaxrxt =
2954 assocparams.sasoc_asocmaxrxt;
2955 if (assocparams.sasoc_cookie_life != 0)
2956 sp->assocparams.sasoc_cookie_life =
2957 assocparams.sasoc_cookie_life;
2958 }
2959 return 0;
2960}
2961
2962/*
2963 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2964 *
2965 * This socket option is a boolean flag which turns on or off mapped V4
2966 * addresses. If this option is turned on and the socket is type
2967 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2968 * If this option is turned off, then no mapping will be done of V4
2969 * addresses and a user will receive both PF_INET6 and PF_INET type
2970 * addresses on the socket.
2971 */
David S. Millerb7058842009-09-30 16:12:20 -07002972static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002973{
2974 int val;
2975 struct sctp_sock *sp = sctp_sk(sk);
2976
2977 if (optlen < sizeof(int))
2978 return -EINVAL;
2979 if (get_user(val, (int __user *)optval))
2980 return -EFAULT;
2981 if (val)
2982 sp->v4mapped = 1;
2983 else
2984 sp->v4mapped = 0;
2985
2986 return 0;
2987}
2988
2989/*
Wei Yongjune89c2092008-12-25 16:54:58 -08002990 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2991 * This option will get or set the maximum size to put in any outgoing
2992 * SCTP DATA chunk. If a message is larger than this size it will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993 * fragmented by SCTP into the specified size. Note that the underlying
2994 * SCTP implementation may fragment into smaller sized chunks when the
2995 * PMTU of the underlying association is smaller than the value set by
Wei Yongjune89c2092008-12-25 16:54:58 -08002996 * the user. The default value for this option is '0' which indicates
2997 * the user is NOT limiting fragmentation and only the PMTU will effect
2998 * SCTP's choice of DATA chunk size. Note also that values set larger
2999 * than the maximum size of an IP datagram will effectively let SCTP
3000 * control fragmentation (i.e. the same as setting this option to 0).
3001 *
3002 * The following structure is used to access and modify this parameter:
3003 *
3004 * struct sctp_assoc_value {
3005 * sctp_assoc_t assoc_id;
3006 * uint32_t assoc_value;
3007 * };
3008 *
3009 * assoc_id: This parameter is ignored for one-to-one style sockets.
3010 * For one-to-many style sockets this parameter indicates which
3011 * association the user is performing an action upon. Note that if
3012 * this field's value is zero then the endpoints default value is
3013 * changed (effecting future associations only).
3014 * assoc_value: This parameter specifies the maximum size in bytes.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003015 */
David S. Millerb7058842009-09-30 16:12:20 -07003016static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003017{
Wei Yongjune89c2092008-12-25 16:54:58 -08003018 struct sctp_assoc_value params;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003019 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003020 struct sctp_sock *sp = sctp_sk(sk);
3021 int val;
3022
Wei Yongjune89c2092008-12-25 16:54:58 -08003023 if (optlen == sizeof(int)) {
Neil Horman94f65192013-12-23 08:29:43 -05003024 pr_warn_ratelimited(DEPRECATED
Neil Hormanf916ec92014-01-02 12:54:27 -05003025 "%s (pid %d) "
Neil Horman94f65192013-12-23 08:29:43 -05003026 "Use of int in maxseg socket option.\n"
Neil Hormanf916ec92014-01-02 12:54:27 -05003027 "Use struct sctp_assoc_value instead\n",
3028 current->comm, task_pid_nr(current));
Wei Yongjune89c2092008-12-25 16:54:58 -08003029 if (copy_from_user(&val, optval, optlen))
3030 return -EFAULT;
3031 params.assoc_id = 0;
3032 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3033 if (copy_from_user(&params, optval, optlen))
3034 return -EFAULT;
3035 val = params.assoc_value;
3036 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07003037 return -EINVAL;
Wei Yongjune89c2092008-12-25 16:54:58 -08003038
Ivan Skytte Jorgensen96a33992005-10-28 15:36:12 -07003039 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003040 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003041
Wei Yongjune89c2092008-12-25 16:54:58 -08003042 asoc = sctp_id2assoc(sk, params.assoc_id);
3043 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3044 return -EINVAL;
3045
3046 if (asoc) {
3047 if (val == 0) {
3048 val = asoc->pathmtu;
3049 val -= sp->pf->af->net_header_len;
3050 val -= sizeof(struct sctphdr) +
3051 sizeof(struct sctp_data_chunk);
3052 }
Vlad Yasevichf68b2e02009-09-04 18:21:00 -04003053 asoc->user_frag = val;
3054 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
Wei Yongjune89c2092008-12-25 16:54:58 -08003055 } else {
3056 sp->user_frag = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003057 }
3058
3059 return 0;
3060}
3061
3062
3063/*
3064 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3065 *
3066 * Requests that the peer mark the enclosed address as the association
3067 * primary. The enclosed address must be one of the association's
3068 * locally bound addresses. The following structure is used to make a
3069 * set primary request:
3070 */
3071static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003072 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003073{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003074 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003075 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003076 struct sctp_association *asoc = NULL;
3077 struct sctp_setpeerprim prim;
3078 struct sctp_chunk *chunk;
Wei Yongjun40a01032010-12-07 17:11:09 +00003079 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003080 int err;
3081
3082 sp = sctp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003083
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003084 if (!net->sctp.addip_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085 return -EPERM;
3086
3087 if (optlen != sizeof(struct sctp_setpeerprim))
3088 return -EINVAL;
3089
3090 if (copy_from_user(&prim, optval, optlen))
3091 return -EFAULT;
3092
3093 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003094 if (!asoc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003095 return -EINVAL;
3096
3097 if (!asoc->peer.asconf_capable)
3098 return -EPERM;
3099
3100 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3101 return -EPERM;
3102
3103 if (!sctp_state(asoc, ESTABLISHED))
3104 return -ENOTCONN;
3105
Wei Yongjun40a01032010-12-07 17:11:09 +00003106 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3107 if (!af)
3108 return -EINVAL;
3109
3110 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3111 return -EADDRNOTAVAIL;
3112
Linus Torvalds1da177e2005-04-16 15:20:36 -07003113 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3114 return -EADDRNOTAVAIL;
3115
3116 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3117 chunk = sctp_make_asconf_set_prim(asoc,
3118 (union sctp_addr *)&prim.sspp_addr);
3119 if (!chunk)
3120 return -ENOMEM;
3121
3122 err = sctp_send_asconf(asoc, chunk);
3123
Daniel Borkmannbb333812013-06-28 19:49:40 +02003124 pr_debug("%s: we set peer primary addr primitively\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003125
3126 return err;
3127}
3128
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003129static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003130 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003131{
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003132 struct sctp_setadaptation adaptation;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003133
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003134 if (optlen != sizeof(struct sctp_setadaptation))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003135 return -EINVAL;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003136 if (copy_from_user(&adaptation, optval, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003137 return -EFAULT;
3138
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003139 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003140
3141 return 0;
3142}
3143
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003144/*
3145 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3146 *
3147 * The context field in the sctp_sndrcvinfo structure is normally only
3148 * used when a failed message is retrieved holding the value that was
3149 * sent down on the actual send call. This option allows the setting of
3150 * a default context on an association basis that will be received on
3151 * reading messages from the peer. This is especially helpful in the
3152 * one-2-many model for an application to keep some reference to an
3153 * internal state machine that is processing messages on the
3154 * association. Note that the setting of this value only effects
3155 * received messages from the peer and does not effect the value that is
3156 * saved with outbound messages.
3157 */
3158static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003159 unsigned int optlen)
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003160{
3161 struct sctp_assoc_value params;
3162 struct sctp_sock *sp;
3163 struct sctp_association *asoc;
3164
3165 if (optlen != sizeof(struct sctp_assoc_value))
3166 return -EINVAL;
3167 if (copy_from_user(&params, optval, optlen))
3168 return -EFAULT;
3169
3170 sp = sctp_sk(sk);
3171
3172 if (params.assoc_id != 0) {
3173 asoc = sctp_id2assoc(sk, params.assoc_id);
3174 if (!asoc)
3175 return -EINVAL;
3176 asoc->default_rcv_context = params.assoc_value;
3177 } else {
3178 sp->default_rcv_context = params.assoc_value;
3179 }
3180
3181 return 0;
3182}
3183
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003184/*
3185 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3186 *
3187 * This options will at a minimum specify if the implementation is doing
3188 * fragmented interleave. Fragmented interleave, for a one to many
3189 * socket, is when subsequent calls to receive a message may return
3190 * parts of messages from different associations. Some implementations
3191 * may allow you to turn this value on or off. If so, when turned off,
3192 * no fragment interleave will occur (which will cause a head of line
3193 * blocking amongst multiple associations sharing the same one to many
3194 * socket). When this option is turned on, then each receive call may
3195 * come from a different association (thus the user must receive data
3196 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3197 * association each receive belongs to.
3198 *
3199 * This option takes a boolean value. A non-zero value indicates that
3200 * fragmented interleave is on. A value of zero indicates that
3201 * fragmented interleave is off.
3202 *
3203 * Note that it is important that an implementation that allows this
3204 * option to be turned on, have it off by default. Otherwise an unaware
3205 * application using the one to many model may become confused and act
3206 * incorrectly.
3207 */
3208static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3209 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003210 unsigned int optlen)
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003211{
3212 int val;
3213
3214 if (optlen != sizeof(int))
3215 return -EINVAL;
3216 if (get_user(val, (int __user *)optval))
3217 return -EFAULT;
3218
3219 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3220
3221 return 0;
3222}
3223
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003224/*
Wei Yongjun8510b932008-12-25 16:59:03 -08003225 * 8.1.21. Set or Get the SCTP Partial Delivery Point
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003226 * (SCTP_PARTIAL_DELIVERY_POINT)
Wei Yongjun8510b932008-12-25 16:59:03 -08003227 *
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003228 * This option will set or get the SCTP partial delivery point. This
3229 * point is the size of a message where the partial delivery API will be
3230 * invoked to help free up rwnd space for the peer. Setting this to a
Wei Yongjun8510b932008-12-25 16:59:03 -08003231 * lower value will cause partial deliveries to happen more often. The
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003232 * calls argument is an integer that sets or gets the partial delivery
Wei Yongjun8510b932008-12-25 16:59:03 -08003233 * point. Note also that the call will fail if the user attempts to set
3234 * this value larger than the socket receive buffer size.
3235 *
3236 * Note that any single message having a length smaller than or equal to
3237 * the SCTP partial delivery point will be delivered in one single read
3238 * call as long as the user provided buffer is large enough to hold the
3239 * message.
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003240 */
3241static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3242 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003243 unsigned int optlen)
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003244{
3245 u32 val;
3246
3247 if (optlen != sizeof(u32))
3248 return -EINVAL;
3249 if (get_user(val, (int __user *)optval))
3250 return -EFAULT;
3251
Wei Yongjun8510b932008-12-25 16:59:03 -08003252 /* Note: We double the receive buffer from what the user sets
3253 * it to be, also initial rwnd is based on rcvbuf/2.
3254 */
3255 if (val > (sk->sk_rcvbuf >> 1))
3256 return -EINVAL;
3257
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003258 sctp_sk(sk)->pd_point = val;
3259
3260 return 0; /* is this the right error code? */
3261}
3262
Vlad Yasevich70331572007-03-23 11:34:36 -07003263/*
3264 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3265 *
3266 * This option will allow a user to change the maximum burst of packets
3267 * that can be emitted by this association. Note that the default value
3268 * is 4, and some implementations may restrict this setting so that it
3269 * can only be lowered.
3270 *
3271 * NOTE: This text doesn't seem right. Do this on a socket basis with
3272 * future associations inheriting the socket value.
3273 */
3274static int sctp_setsockopt_maxburst(struct sock *sk,
3275 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003276 unsigned int optlen)
Vlad Yasevich70331572007-03-23 11:34:36 -07003277{
Neil Horman219b99a2008-03-05 13:44:46 -08003278 struct sctp_assoc_value params;
3279 struct sctp_sock *sp;
3280 struct sctp_association *asoc;
Vlad Yasevich70331572007-03-23 11:34:36 -07003281 int val;
Neil Horman219b99a2008-03-05 13:44:46 -08003282 int assoc_id = 0;
Vlad Yasevich70331572007-03-23 11:34:36 -07003283
Neil Horman219b99a2008-03-05 13:44:46 -08003284 if (optlen == sizeof(int)) {
Neil Horman94f65192013-12-23 08:29:43 -05003285 pr_warn_ratelimited(DEPRECATED
Neil Hormanf916ec92014-01-02 12:54:27 -05003286 "%s (pid %d) "
Neil Horman94f65192013-12-23 08:29:43 -05003287 "Use of int in max_burst socket option deprecated.\n"
Neil Hormanf916ec92014-01-02 12:54:27 -05003288 "Use struct sctp_assoc_value instead\n",
3289 current->comm, task_pid_nr(current));
Neil Horman219b99a2008-03-05 13:44:46 -08003290 if (copy_from_user(&val, optval, optlen))
3291 return -EFAULT;
3292 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3293 if (copy_from_user(&params, optval, optlen))
3294 return -EFAULT;
3295 val = params.assoc_value;
3296 assoc_id = params.assoc_id;
3297 } else
3298 return -EINVAL;
3299
3300 sp = sctp_sk(sk);
3301
3302 if (assoc_id != 0) {
3303 asoc = sctp_id2assoc(sk, assoc_id);
3304 if (!asoc)
3305 return -EINVAL;
3306 asoc->max_burst = val;
3307 } else
3308 sp->max_burst = val;
Vlad Yasevich70331572007-03-23 11:34:36 -07003309
3310 return 0;
3311}
3312
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003313/*
3314 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3315 *
3316 * This set option adds a chunk type that the user is requesting to be
3317 * received only in an authenticated way. Changes to the list of chunks
3318 * will only effect future associations on the socket.
3319 */
3320static int sctp_setsockopt_auth_chunk(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003321 char __user *optval,
3322 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003323{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003324 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003325 struct sctp_authchunk val;
3326
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003327 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003328 return -EACCES;
3329
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003330 if (optlen != sizeof(struct sctp_authchunk))
3331 return -EINVAL;
3332 if (copy_from_user(&val, optval, optlen))
3333 return -EFAULT;
3334
3335 switch (val.sauth_chunk) {
Joe Perches7fd71b12011-07-01 09:43:11 +00003336 case SCTP_CID_INIT:
3337 case SCTP_CID_INIT_ACK:
3338 case SCTP_CID_SHUTDOWN_COMPLETE:
3339 case SCTP_CID_AUTH:
3340 return -EINVAL;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003341 }
3342
3343 /* add this chunk id to the endpoint */
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003344 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003345}
3346
3347/*
3348 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3349 *
3350 * This option gets or sets the list of HMAC algorithms that the local
3351 * endpoint requires the peer to use.
3352 */
3353static int sctp_setsockopt_hmac_ident(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003354 char __user *optval,
3355 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003356{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003357 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003358 struct sctp_hmacalgo *hmacs;
Vlad Yasevichd9724052008-08-27 16:09:49 -07003359 u32 idents;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003360 int err;
3361
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003362 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003363 return -EACCES;
3364
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003365 if (optlen < sizeof(struct sctp_hmacalgo))
3366 return -EINVAL;
3367
wangweidongcb3f8372013-12-23 12:16:50 +08003368 hmacs = memdup_user(optval, optlen);
Shan Wei934253a2011-04-18 19:13:18 +00003369 if (IS_ERR(hmacs))
3370 return PTR_ERR(hmacs);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003371
Vlad Yasevichd9724052008-08-27 16:09:49 -07003372 idents = hmacs->shmac_num_idents;
3373 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3374 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003375 err = -EINVAL;
3376 goto out;
3377 }
3378
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003379 err = sctp_auth_ep_set_hmacs(ep, hmacs);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003380out:
3381 kfree(hmacs);
3382 return err;
3383}
3384
3385/*
3386 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3387 *
3388 * This option will set a shared secret key which is used to build an
3389 * association shared key.
3390 */
3391static int sctp_setsockopt_auth_key(struct sock *sk,
3392 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003393 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003394{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003395 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003396 struct sctp_authkey *authkey;
3397 struct sctp_association *asoc;
3398 int ret;
3399
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003400 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003401 return -EACCES;
3402
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003403 if (optlen <= sizeof(struct sctp_authkey))
3404 return -EINVAL;
3405
wangweidongcb3f8372013-12-23 12:16:50 +08003406 authkey = memdup_user(optval, optlen);
Shan Wei934253a2011-04-18 19:13:18 +00003407 if (IS_ERR(authkey))
3408 return PTR_ERR(authkey);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003409
Vlad Yasevich328fc472008-08-27 16:08:54 -07003410 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
Vlad Yasevich30c22352008-08-25 15:16:19 -07003411 ret = -EINVAL;
3412 goto out;
3413 }
3414
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003415 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3416 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3417 ret = -EINVAL;
3418 goto out;
3419 }
3420
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003421 ret = sctp_auth_set_key(ep, asoc, authkey);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003422out:
Daniel Borkmann6ba542a2013-02-08 03:04:34 +00003423 kzfree(authkey);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003424 return ret;
3425}
3426
3427/*
3428 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3429 *
3430 * This option will get or set the active shared key to be used to build
3431 * the association shared key.
3432 */
3433static int sctp_setsockopt_active_key(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003434 char __user *optval,
3435 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003436{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003437 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003438 struct sctp_authkeyid val;
3439 struct sctp_association *asoc;
3440
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003441 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003442 return -EACCES;
3443
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003444 if (optlen != sizeof(struct sctp_authkeyid))
3445 return -EINVAL;
3446 if (copy_from_user(&val, optval, optlen))
3447 return -EFAULT;
3448
3449 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3450 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3451 return -EINVAL;
3452
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003453 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003454}
3455
3456/*
3457 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3458 *
3459 * This set option will delete a shared secret key from use.
3460 */
3461static int sctp_setsockopt_del_key(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003462 char __user *optval,
3463 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003464{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003465 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003466 struct sctp_authkeyid val;
3467 struct sctp_association *asoc;
3468
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003469 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003470 return -EACCES;
3471
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003472 if (optlen != sizeof(struct sctp_authkeyid))
3473 return -EINVAL;
3474 if (copy_from_user(&val, optval, optlen))
3475 return -EFAULT;
3476
3477 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3478 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3479 return -EINVAL;
3480
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003481 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003482
3483}
3484
Michio Honda7dc04d72011-04-26 20:16:31 +09003485/*
3486 * 8.1.23 SCTP_AUTO_ASCONF
3487 *
3488 * This option will enable or disable the use of the automatic generation of
3489 * ASCONF chunks to add and delete addresses to an existing association. Note
3490 * that this option has two caveats namely: a) it only affects sockets that
3491 * are bound to all addresses available to the SCTP stack, and b) the system
3492 * administrator may have an overriding control that turns the ASCONF feature
3493 * off no matter what setting the socket option may have.
3494 * This option expects an integer boolean flag, where a non-zero value turns on
3495 * the option, and a zero value turns off the option.
3496 * Note. In this implementation, socket operation overrides default parameter
3497 * being set by sysctl as well as FreeBSD implementation
3498 */
3499static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3500 unsigned int optlen)
3501{
3502 int val;
3503 struct sctp_sock *sp = sctp_sk(sk);
3504
3505 if (optlen < sizeof(int))
3506 return -EINVAL;
3507 if (get_user(val, (int __user *)optval))
3508 return -EFAULT;
3509 if (!sctp_is_ep_boundall(sk) && val)
3510 return -EINVAL;
3511 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3512 return 0;
3513
3514 if (val == 0 && sp->do_auto_asconf) {
3515 list_del(&sp->auto_asconf_list);
3516 sp->do_auto_asconf = 0;
3517 } else if (val && !sp->do_auto_asconf) {
3518 list_add_tail(&sp->auto_asconf_list,
Eric W. Biederman4db67e82012-08-06 08:42:04 +00003519 &sock_net(sk)->sctp.auto_asconf_splist);
Michio Honda7dc04d72011-04-26 20:16:31 +09003520 sp->do_auto_asconf = 1;
3521 }
3522 return 0;
3523}
3524
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003525
Neil Horman5aa93bc2012-07-21 07:56:07 +00003526/*
3527 * SCTP_PEER_ADDR_THLDS
3528 *
3529 * This option allows us to alter the partially failed threshold for one or all
3530 * transports in an association. See Section 6.1 of:
3531 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3532 */
3533static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3534 char __user *optval,
3535 unsigned int optlen)
3536{
3537 struct sctp_paddrthlds val;
3538 struct sctp_transport *trans;
3539 struct sctp_association *asoc;
3540
3541 if (optlen < sizeof(struct sctp_paddrthlds))
3542 return -EINVAL;
3543 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3544 sizeof(struct sctp_paddrthlds)))
3545 return -EFAULT;
3546
3547
3548 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3549 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3550 if (!asoc)
3551 return -ENOENT;
3552 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3553 transports) {
3554 if (val.spt_pathmaxrxt)
3555 trans->pathmaxrxt = val.spt_pathmaxrxt;
3556 trans->pf_retrans = val.spt_pathpfthld;
3557 }
3558
3559 if (val.spt_pathmaxrxt)
3560 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3561 asoc->pf_retrans = val.spt_pathpfthld;
3562 } else {
3563 trans = sctp_addr_id2transport(sk, &val.spt_address,
3564 val.spt_assoc_id);
3565 if (!trans)
3566 return -ENOENT;
3567
3568 if (val.spt_pathmaxrxt)
3569 trans->pathmaxrxt = val.spt_pathmaxrxt;
3570 trans->pf_retrans = val.spt_pathpfthld;
3571 }
3572
3573 return 0;
3574}
3575
Linus Torvalds1da177e2005-04-16 15:20:36 -07003576/* API 6.2 setsockopt(), getsockopt()
3577 *
3578 * Applications use setsockopt() and getsockopt() to set or retrieve
3579 * socket options. Socket options are used to change the default
3580 * behavior of sockets calls. They are described in Section 7.
3581 *
3582 * The syntax is:
3583 *
3584 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3585 * int __user *optlen);
3586 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3587 * int optlen);
3588 *
3589 * sd - the socket descript.
3590 * level - set to IPPROTO_SCTP for all SCTP options.
3591 * optname - the option name.
3592 * optval - the buffer to store the value of the option.
3593 * optlen - the size of the buffer.
3594 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003595static int sctp_setsockopt(struct sock *sk, int level, int optname,
3596 char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003597{
3598 int retval = 0;
3599
Daniel Borkmannbb333812013-06-28 19:49:40 +02003600 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003601
3602 /* I can hardly begin to describe how wrong this is. This is
3603 * so broken as to be worse than useless. The API draft
3604 * REALLY is NOT helpful here... I am not convinced that the
3605 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3606 * are at all well-founded.
3607 */
3608 if (level != SOL_SCTP) {
3609 struct sctp_af *af = sctp_sk(sk)->pf->af;
3610 retval = af->setsockopt(sk, level, optname, optval, optlen);
3611 goto out_nounlock;
3612 }
3613
wangweidong048ed4b2014-01-21 15:44:11 +08003614 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003615
3616 switch (optname) {
3617 case SCTP_SOCKOPT_BINDX_ADD:
3618 /* 'optlen' is the size of the addresses buffer. */
3619 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3620 optlen, SCTP_BINDX_ADD_ADDR);
3621 break;
3622
3623 case SCTP_SOCKOPT_BINDX_REM:
3624 /* 'optlen' is the size of the addresses buffer. */
3625 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3626 optlen, SCTP_BINDX_REM_ADDR);
3627 break;
3628
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003629 case SCTP_SOCKOPT_CONNECTX_OLD:
3630 /* 'optlen' is the size of the addresses buffer. */
3631 retval = sctp_setsockopt_connectx_old(sk,
3632 (struct sockaddr __user *)optval,
3633 optlen);
3634 break;
3635
Frank Filz3f7a87d2005-06-20 13:14:57 -07003636 case SCTP_SOCKOPT_CONNECTX:
3637 /* 'optlen' is the size of the addresses buffer. */
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003638 retval = sctp_setsockopt_connectx(sk,
3639 (struct sockaddr __user *)optval,
3640 optlen);
Frank Filz3f7a87d2005-06-20 13:14:57 -07003641 break;
3642
Linus Torvalds1da177e2005-04-16 15:20:36 -07003643 case SCTP_DISABLE_FRAGMENTS:
3644 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3645 break;
3646
3647 case SCTP_EVENTS:
3648 retval = sctp_setsockopt_events(sk, optval, optlen);
3649 break;
3650
3651 case SCTP_AUTOCLOSE:
3652 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3653 break;
3654
3655 case SCTP_PEER_ADDR_PARAMS:
3656 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3657 break;
3658
Shan Wei4580ccc2011-01-18 22:39:00 +00003659 case SCTP_DELAYED_SACK:
Wei Yongjund364d922008-05-09 15:13:26 -07003660 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
Frank Filz77086102005-12-22 11:37:30 -08003661 break;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003662 case SCTP_PARTIAL_DELIVERY_POINT:
3663 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3664 break;
Frank Filz77086102005-12-22 11:37:30 -08003665
Linus Torvalds1da177e2005-04-16 15:20:36 -07003666 case SCTP_INITMSG:
3667 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3668 break;
3669 case SCTP_DEFAULT_SEND_PARAM:
3670 retval = sctp_setsockopt_default_send_param(sk, optval,
3671 optlen);
3672 break;
3673 case SCTP_PRIMARY_ADDR:
3674 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3675 break;
3676 case SCTP_SET_PEER_PRIMARY_ADDR:
3677 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3678 break;
3679 case SCTP_NODELAY:
3680 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3681 break;
3682 case SCTP_RTOINFO:
3683 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3684 break;
3685 case SCTP_ASSOCINFO:
3686 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3687 break;
3688 case SCTP_I_WANT_MAPPED_V4_ADDR:
3689 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3690 break;
3691 case SCTP_MAXSEG:
3692 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3693 break;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003694 case SCTP_ADAPTATION_LAYER:
3695 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003696 break;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003697 case SCTP_CONTEXT:
3698 retval = sctp_setsockopt_context(sk, optval, optlen);
3699 break;
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003700 case SCTP_FRAGMENT_INTERLEAVE:
3701 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3702 break;
Vlad Yasevich70331572007-03-23 11:34:36 -07003703 case SCTP_MAX_BURST:
3704 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3705 break;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003706 case SCTP_AUTH_CHUNK:
3707 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3708 break;
3709 case SCTP_HMAC_IDENT:
3710 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3711 break;
3712 case SCTP_AUTH_KEY:
3713 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3714 break;
3715 case SCTP_AUTH_ACTIVE_KEY:
3716 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3717 break;
3718 case SCTP_AUTH_DELETE_KEY:
3719 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3720 break;
Michio Honda7dc04d72011-04-26 20:16:31 +09003721 case SCTP_AUTO_ASCONF:
3722 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3723 break;
Neil Horman5aa93bc2012-07-21 07:56:07 +00003724 case SCTP_PEER_ADDR_THLDS:
3725 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3726 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003727 default:
3728 retval = -ENOPROTOOPT;
3729 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07003730 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003731
wangweidong048ed4b2014-01-21 15:44:11 +08003732 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003733
3734out_nounlock:
3735 return retval;
3736}
3737
3738/* API 3.1.6 connect() - UDP Style Syntax
3739 *
3740 * An application may use the connect() call in the UDP model to initiate an
3741 * association without sending data.
3742 *
3743 * The syntax is:
3744 *
3745 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3746 *
3747 * sd: the socket descriptor to have a new association added to.
3748 *
3749 * nam: the address structure (either struct sockaddr_in or struct
3750 * sockaddr_in6 defined in RFC2553 [7]).
3751 *
3752 * len: the size of the address.
3753 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003754static int sctp_connect(struct sock *sk, struct sockaddr *addr,
3755 int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003756{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003757 int err = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07003758 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003759
wangweidong048ed4b2014-01-21 15:44:11 +08003760 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003761
Daniel Borkmannbb333812013-06-28 19:49:40 +02003762 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
3763 addr, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003764
Frank Filz3f7a87d2005-06-20 13:14:57 -07003765 /* Validate addr_len before calling common connect/connectx routine. */
3766 af = sctp_get_af_specific(addr->sa_family);
3767 if (!af || addr_len < af->sockaddr_len) {
3768 err = -EINVAL;
3769 } else {
3770 /* Pass correct addr len to common routine (so it knows there
3771 * is only one address being passed.
3772 */
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003773 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003774 }
3775
wangweidong048ed4b2014-01-21 15:44:11 +08003776 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003777 return err;
3778}
3779
3780/* FIXME: Write comments. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003781static int sctp_disconnect(struct sock *sk, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003782{
3783 return -EOPNOTSUPP; /* STUB */
3784}
3785
3786/* 4.1.4 accept() - TCP Style Syntax
3787 *
3788 * Applications use accept() call to remove an established SCTP
3789 * association from the accept queue of the endpoint. A new socket
3790 * descriptor will be returned from accept() to represent the newly
3791 * formed association.
3792 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003793static struct sock *sctp_accept(struct sock *sk, int flags, int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003794{
3795 struct sctp_sock *sp;
3796 struct sctp_endpoint *ep;
3797 struct sock *newsk = NULL;
3798 struct sctp_association *asoc;
3799 long timeo;
3800 int error = 0;
3801
wangweidong048ed4b2014-01-21 15:44:11 +08003802 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003803
3804 sp = sctp_sk(sk);
3805 ep = sp->ep;
3806
3807 if (!sctp_style(sk, TCP)) {
3808 error = -EOPNOTSUPP;
3809 goto out;
3810 }
3811
3812 if (!sctp_sstate(sk, LISTENING)) {
3813 error = -EINVAL;
3814 goto out;
3815 }
3816
Sridhar Samudrala8abfedd2006-08-22 00:24:09 -07003817 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003818
3819 error = sctp_wait_for_accept(sk, timeo);
3820 if (error)
3821 goto out;
3822
3823 /* We treat the list of associations on the endpoint as the accept
3824 * queue and pick the first association on the list.
3825 */
3826 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3827
3828 newsk = sp->pf->create_accept_sk(sk, asoc);
3829 if (!newsk) {
3830 error = -ENOMEM;
3831 goto out;
3832 }
3833
3834 /* Populate the fields of the newsk from the oldsk and migrate the
3835 * asoc to the newsk.
3836 */
3837 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3838
3839out:
wangweidong048ed4b2014-01-21 15:44:11 +08003840 release_sock(sk);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003841 *err = error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003842 return newsk;
3843}
3844
3845/* The SCTP ioctl handler. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003846static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003847{
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003848 int rc = -ENOTCONN;
3849
wangweidong048ed4b2014-01-21 15:44:11 +08003850 lock_sock(sk);
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003851
3852 /*
3853 * SEQPACKET-style sockets in LISTENING state are valid, for
3854 * SCTP, so only discard TCP-style sockets in LISTENING state.
3855 */
3856 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3857 goto out;
3858
3859 switch (cmd) {
3860 case SIOCINQ: {
3861 struct sk_buff *skb;
3862 unsigned int amount = 0;
3863
3864 skb = skb_peek(&sk->sk_receive_queue);
3865 if (skb != NULL) {
3866 /*
3867 * We will only return the amount of this packet since
3868 * that is all that will be read.
3869 */
3870 amount = skb->len;
3871 }
3872 rc = put_user(amount, (int __user *)arg);
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003873 break;
David S. Miller9a7241c2010-10-03 22:14:37 -07003874 }
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003875 default:
3876 rc = -ENOIOCTLCMD;
3877 break;
3878 }
3879out:
wangweidong048ed4b2014-01-21 15:44:11 +08003880 release_sock(sk);
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003881 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003882}
3883
3884/* This is the function which gets called during socket creation to
3885 * initialized the SCTP-specific portion of the sock.
3886 * The sock structure should already be zero-filled memory.
3887 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003888static int sctp_init_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003889{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003890 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003891 struct sctp_sock *sp;
3892
Daniel Borkmannbb333812013-06-28 19:49:40 +02003893 pr_debug("%s: sk:%p\n", __func__, sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003894
3895 sp = sctp_sk(sk);
3896
3897 /* Initialize the SCTP per socket area. */
3898 switch (sk->sk_type) {
3899 case SOCK_SEQPACKET:
3900 sp->type = SCTP_SOCKET_UDP;
3901 break;
3902 case SOCK_STREAM:
3903 sp->type = SCTP_SOCKET_TCP;
3904 break;
3905 default:
3906 return -ESOCKTNOSUPPORT;
3907 }
3908
3909 /* Initialize default send parameters. These parameters can be
3910 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3911 */
3912 sp->default_stream = 0;
3913 sp->default_ppid = 0;
3914 sp->default_flags = 0;
3915 sp->default_context = 0;
3916 sp->default_timetolive = 0;
3917
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003918 sp->default_rcv_context = 0;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003919 sp->max_burst = net->sctp.max_burst;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003920
Neil Horman3c681982012-10-24 09:20:03 +00003921 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
3922
Linus Torvalds1da177e2005-04-16 15:20:36 -07003923 /* Initialize default setup parameters. These parameters
3924 * can be modified with the SCTP_INITMSG socket option or
3925 * overridden by the SCTP_INIT CMSG.
3926 */
3927 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
3928 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003929 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
3930 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003931
3932 /* Initialize default RTO related parameters. These parameters can
3933 * be modified for with the SCTP_RTOINFO socket option.
3934 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003935 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
3936 sp->rtoinfo.srto_max = net->sctp.rto_max;
3937 sp->rtoinfo.srto_min = net->sctp.rto_min;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003938
3939 /* Initialize default association related parameters. These parameters
3940 * can be modified with the SCTP_ASSOCINFO socket option.
3941 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003942 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003943 sp->assocparams.sasoc_number_peer_destinations = 0;
3944 sp->assocparams.sasoc_peer_rwnd = 0;
3945 sp->assocparams.sasoc_local_rwnd = 0;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003946 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003947
3948 /* Initialize default event subscriptions. By default, all the
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003949 * options are off.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003950 */
3951 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3952
3953 /* Default Peer Address Parameters. These defaults can
3954 * be modified via SCTP_PEER_ADDR_PARAMS
3955 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003956 sp->hbinterval = net->sctp.hb_interval;
3957 sp->pathmaxrxt = net->sctp.max_retrans_path;
wangweidong4e2d52b2013-12-23 12:16:54 +08003958 sp->pathmtu = 0; /* allow default discovery */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003959 sp->sackdelay = net->sctp.sack_timeout;
Vlad Yasevich7bfe8bd2008-06-09 15:45:05 -07003960 sp->sackfreq = 2;
Frank Filz52ccb8e2005-12-22 11:36:46 -08003961 sp->param_flags = SPP_HB_ENABLE |
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003962 SPP_PMTUD_ENABLE |
3963 SPP_SACKDELAY_ENABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003964
3965 /* If enabled no SCTP message fragmentation will be performed.
3966 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3967 */
3968 sp->disable_fragments = 0;
3969
Sridhar Samudrala208edef2006-09-29 17:08:01 -07003970 /* Enable Nagle algorithm by default. */
3971 sp->nodelay = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003972
3973 /* Enable by default. */
3974 sp->v4mapped = 1;
3975
3976 /* Auto-close idle associations after the configured
3977 * number of seconds. A value of 0 disables this
3978 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3979 * for UDP-style sockets only.
3980 */
3981 sp->autoclose = 0;
3982
3983 /* User specified fragmentation limit. */
3984 sp->user_frag = 0;
3985
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003986 sp->adaptation_ind = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003987
3988 sp->pf = sctp_get_pf_specific(sk->sk_family);
3989
3990 /* Control variables for partial data delivery. */
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003991 atomic_set(&sp->pd_mode, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003992 skb_queue_head_init(&sp->pd_lobby);
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003993 sp->frag_interleave = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003994
3995 /* Create a per socket endpoint structure. Even if we
3996 * change the data structure relationships, this may still
3997 * be useful for storing pre-connect address information.
3998 */
Daniel Borkmannc164b832013-06-14 18:24:06 +02003999 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4000 if (!sp->ep)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004001 return -ENOMEM;
4002
Linus Torvalds1da177e2005-04-16 15:20:36 -07004003 sp->hmac = NULL;
4004
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +02004005 sk->sk_destruct = sctp_destruct_sock;
4006
Linus Torvalds1da177e2005-04-16 15:20:36 -07004007 SCTP_DBG_OBJCNT_INC(sock);
David S. Miller6f756a82008-11-23 17:34:03 -08004008
4009 local_bh_disable();
Vlad Yasevich81419d82010-04-28 08:47:20 +00004010 percpu_counter_inc(&sctp_sockets_allocated);
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004011 sock_prot_inuse_add(net, sk->sk_prot, 1);
4012 if (net->sctp.default_auto_asconf) {
Michio Honda9f7d6532011-04-26 19:32:51 +09004013 list_add_tail(&sp->auto_asconf_list,
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004014 &net->sctp.auto_asconf_splist);
Michio Honda9f7d6532011-04-26 19:32:51 +09004015 sp->do_auto_asconf = 1;
4016 } else
4017 sp->do_auto_asconf = 0;
David S. Miller6f756a82008-11-23 17:34:03 -08004018 local_bh_enable();
4019
Linus Torvalds1da177e2005-04-16 15:20:36 -07004020 return 0;
4021}
4022
4023/* Cleanup any SCTP per socket resources. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02004024static void sctp_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004025{
Michio Honda9f7d6532011-04-26 19:32:51 +09004026 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004027
Daniel Borkmannbb333812013-06-28 19:49:40 +02004028 pr_debug("%s: sk:%p\n", __func__, sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004029
4030 /* Release our hold on the endpoint. */
Michio Honda9f7d6532011-04-26 19:32:51 +09004031 sp = sctp_sk(sk);
Daniel Borkmann1abd1652013-06-06 15:53:47 +02004032 /* This could happen during socket init, thus we bail out
4033 * early, since the rest of the below is not setup either.
4034 */
4035 if (sp->ep == NULL)
4036 return;
4037
Michio Honda9f7d6532011-04-26 19:32:51 +09004038 if (sp->do_auto_asconf) {
4039 sp->do_auto_asconf = 0;
4040 list_del(&sp->auto_asconf_list);
4041 }
4042 sctp_endpoint_free(sp->ep);
Eric Dumazet5bc0b3b2008-11-25 13:53:27 -08004043 local_bh_disable();
Vlad Yasevich81419d82010-04-28 08:47:20 +00004044 percpu_counter_dec(&sctp_sockets_allocated);
Eric Dumazet9a57f7f2008-11-17 02:41:00 -08004045 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
Eric Dumazet5bc0b3b2008-11-25 13:53:27 -08004046 local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004047}
4048
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +02004049/* Triggered when there are no references on the socket anymore */
4050static void sctp_destruct_sock(struct sock *sk)
4051{
4052 struct sctp_sock *sp = sctp_sk(sk);
4053
4054 /* Free up the HMAC transform. */
4055 crypto_free_hash(sp->hmac);
4056
4057 inet_sock_destruct(sk);
4058}
4059
Linus Torvalds1da177e2005-04-16 15:20:36 -07004060/* API 4.1.7 shutdown() - TCP Style Syntax
4061 * int shutdown(int socket, int how);
4062 *
4063 * sd - the socket descriptor of the association to be closed.
4064 * how - Specifies the type of shutdown. The values are
4065 * as follows:
4066 * SHUT_RD
4067 * Disables further receive operations. No SCTP
4068 * protocol action is taken.
4069 * SHUT_WR
4070 * Disables further send operations, and initiates
4071 * the SCTP shutdown sequence.
4072 * SHUT_RDWR
4073 * Disables further send and receive operations
4074 * and initiates the SCTP shutdown sequence.
4075 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02004076static void sctp_shutdown(struct sock *sk, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004077{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00004078 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004079 struct sctp_endpoint *ep;
4080 struct sctp_association *asoc;
4081
4082 if (!sctp_style(sk, TCP))
4083 return;
4084
4085 if (how & SEND_SHUTDOWN) {
4086 ep = sctp_sk(sk)->ep;
4087 if (!list_empty(&ep->asocs)) {
4088 asoc = list_entry(ep->asocs.next,
4089 struct sctp_association, asocs);
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00004090 sctp_primitive_SHUTDOWN(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004091 }
4092 }
4093}
4094
4095/* 7.2.1 Association Status (SCTP_STATUS)
4096
4097 * Applications can retrieve current status information about an
4098 * association, including association state, peer receiver window size,
4099 * number of unacked data chunks, and number of data chunks pending
4100 * receipt. This information is read-only.
4101 */
4102static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4103 char __user *optval,
4104 int __user *optlen)
4105{
4106 struct sctp_status status;
4107 struct sctp_association *asoc = NULL;
4108 struct sctp_transport *transport;
4109 sctp_assoc_t associd;
4110 int retval = 0;
4111
Neil Horman408f22e2007-06-16 14:03:45 -04004112 if (len < sizeof(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004113 retval = -EINVAL;
4114 goto out;
4115 }
4116
Neil Horman408f22e2007-06-16 14:03:45 -04004117 len = sizeof(status);
4118 if (copy_from_user(&status, optval, len)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004119 retval = -EFAULT;
4120 goto out;
4121 }
4122
4123 associd = status.sstat_assoc_id;
4124 asoc = sctp_id2assoc(sk, associd);
4125 if (!asoc) {
4126 retval = -EINVAL;
4127 goto out;
4128 }
4129
4130 transport = asoc->peer.primary_path;
4131
4132 status.sstat_assoc_id = sctp_assoc2id(asoc);
4133 status.sstat_state = asoc->state;
4134 status.sstat_rwnd = asoc->peer.rwnd;
4135 status.sstat_unackdata = asoc->unack_data;
4136
4137 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4138 status.sstat_instrms = asoc->c.sinit_max_instreams;
4139 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4140 status.sstat_fragmentation_point = asoc->frag_point;
4141 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
Al Viro8cec6b82006-11-20 17:23:01 -08004142 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4143 transport->af_specific->sockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004144 /* Map ipv4 address into v4-mapped-on-v6 address. */
4145 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4146 (union sctp_addr *)&status.sstat_primary.spinfo_address);
Frank Filz3f7a87d2005-06-20 13:14:57 -07004147 status.sstat_primary.spinfo_state = transport->state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004148 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4149 status.sstat_primary.spinfo_srtt = transport->srtt;
4150 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
Frank Filz52ccb8e2005-12-22 11:36:46 -08004151 status.sstat_primary.spinfo_mtu = transport->pathmtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004152
Frank Filz3f7a87d2005-06-20 13:14:57 -07004153 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4154 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4155
Linus Torvalds1da177e2005-04-16 15:20:36 -07004156 if (put_user(len, optlen)) {
4157 retval = -EFAULT;
4158 goto out;
4159 }
4160
Daniel Borkmannbb333812013-06-28 19:49:40 +02004161 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4162 __func__, len, status.sstat_state, status.sstat_rwnd,
4163 status.sstat_assoc_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004164
4165 if (copy_to_user(optval, &status, len)) {
4166 retval = -EFAULT;
4167 goto out;
4168 }
4169
4170out:
Eric Dumazeta02cec22010-09-22 20:43:57 +00004171 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004172}
4173
4174
4175/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4176 *
4177 * Applications can retrieve information about a specific peer address
4178 * of an association, including its reachability state, congestion
4179 * window, and retransmission timer values. This information is
4180 * read-only.
4181 */
4182static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4183 char __user *optval,
4184 int __user *optlen)
4185{
4186 struct sctp_paddrinfo pinfo;
4187 struct sctp_transport *transport;
4188 int retval = 0;
4189
Neil Horman408f22e2007-06-16 14:03:45 -04004190 if (len < sizeof(pinfo)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004191 retval = -EINVAL;
4192 goto out;
4193 }
4194
Neil Horman408f22e2007-06-16 14:03:45 -04004195 len = sizeof(pinfo);
4196 if (copy_from_user(&pinfo, optval, len)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004197 retval = -EFAULT;
4198 goto out;
4199 }
4200
4201 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4202 pinfo.spinfo_assoc_id);
4203 if (!transport)
4204 return -EINVAL;
4205
4206 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
Frank Filz3f7a87d2005-06-20 13:14:57 -07004207 pinfo.spinfo_state = transport->state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004208 pinfo.spinfo_cwnd = transport->cwnd;
4209 pinfo.spinfo_srtt = transport->srtt;
4210 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
Frank Filz52ccb8e2005-12-22 11:36:46 -08004211 pinfo.spinfo_mtu = transport->pathmtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004212
Frank Filz3f7a87d2005-06-20 13:14:57 -07004213 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4214 pinfo.spinfo_state = SCTP_ACTIVE;
4215
Linus Torvalds1da177e2005-04-16 15:20:36 -07004216 if (put_user(len, optlen)) {
4217 retval = -EFAULT;
4218 goto out;
4219 }
4220
4221 if (copy_to_user(optval, &pinfo, len)) {
4222 retval = -EFAULT;
4223 goto out;
4224 }
4225
4226out:
Eric Dumazeta02cec22010-09-22 20:43:57 +00004227 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004228}
4229
4230/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4231 *
4232 * This option is a on/off flag. If enabled no SCTP message
4233 * fragmentation will be performed. Instead if a message being sent
4234 * exceeds the current PMTU size, the message will NOT be sent and
4235 * instead a error will be indicated to the user.
4236 */
4237static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4238 char __user *optval, int __user *optlen)
4239{
4240 int val;
4241
4242 if (len < sizeof(int))
4243 return -EINVAL;
4244
4245 len = sizeof(int);
4246 val = (sctp_sk(sk)->disable_fragments == 1);
4247 if (put_user(len, optlen))
4248 return -EFAULT;
4249 if (copy_to_user(optval, &val, len))
4250 return -EFAULT;
4251 return 0;
4252}
4253
4254/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4255 *
4256 * This socket option is used to specify various notifications and
4257 * ancillary data the user wishes to receive.
4258 */
4259static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4260 int __user *optlen)
4261{
Thomas Grafacdd5982012-04-03 22:17:53 +00004262 if (len <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004263 return -EINVAL;
Thomas Grafacdd5982012-04-03 22:17:53 +00004264 if (len > sizeof(struct sctp_event_subscribe))
4265 len = sizeof(struct sctp_event_subscribe);
Neil Horman408f22e2007-06-16 14:03:45 -04004266 if (put_user(len, optlen))
4267 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004268 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4269 return -EFAULT;
4270 return 0;
4271}
4272
4273/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4274 *
4275 * This socket option is applicable to the UDP-style socket only. When
4276 * set it will cause associations that are idle for more than the
4277 * specified number of seconds to automatically close. An association
4278 * being idle is defined an association that has NOT sent or received
4279 * user data. The special value of '0' indicates that no automatic
4280 * close of any associations should be performed. The option expects an
4281 * integer defining the number of seconds of idle time before an
4282 * association is closed.
4283 */
4284static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4285{
4286 /* Applicable to UDP-style socket only */
4287 if (sctp_style(sk, TCP))
4288 return -EOPNOTSUPP;
Neil Horman408f22e2007-06-16 14:03:45 -04004289 if (len < sizeof(int))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004290 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004291 len = sizeof(int);
4292 if (put_user(len, optlen))
4293 return -EFAULT;
4294 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004295 return -EFAULT;
4296 return 0;
4297}
4298
4299/* Helper routine to branch off an association to a new socket. */
Benjamin Poirier0343c552012-03-08 05:55:58 +00004300int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004301{
Benjamin Poirier0343c552012-03-08 05:55:58 +00004302 struct sctp_association *asoc = sctp_id2assoc(sk, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004303 struct socket *sock;
Vlad Yasevichd570ee42007-05-15 16:32:39 -04004304 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004305 int err = 0;
4306
Benjamin Poirier0343c552012-03-08 05:55:58 +00004307 if (!asoc)
4308 return -EINVAL;
4309
Linus Torvalds1da177e2005-04-16 15:20:36 -07004310 /* An association cannot be branched off from an already peeled-off
4311 * socket, nor is this supported for tcp style sockets.
4312 */
4313 if (!sctp_style(sk, UDP))
4314 return -EINVAL;
4315
4316 /* Create a new socket. */
4317 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4318 if (err < 0)
4319 return err;
4320
Vlad Yasevich914e1c82009-02-13 08:33:44 +00004321 sctp_copy_sock(sock->sk, sk, asoc);
Vlad Yasevich4f444302006-10-30 18:54:32 -08004322
4323 /* Make peeled-off sockets more like 1-1 accepted sockets.
4324 * Set the daddr and initialize id to something more random
4325 */
Vlad Yasevichd570ee42007-05-15 16:32:39 -04004326 af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
4327 af->to_sk_daddr(&asoc->peer.primary_addr, sk);
Vlad Yasevich914e1c82009-02-13 08:33:44 +00004328
4329 /* Populate the fields of the newsk from the oldsk and migrate the
4330 * asoc to the newsk.
4331 */
4332 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
Vlad Yasevich4f444302006-10-30 18:54:32 -08004333
Linus Torvalds1da177e2005-04-16 15:20:36 -07004334 *sockp = sock;
4335
4336 return err;
4337}
Benjamin Poirier0343c552012-03-08 05:55:58 +00004338EXPORT_SYMBOL(sctp_do_peeloff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004339
4340static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4341{
4342 sctp_peeloff_arg_t peeloff;
4343 struct socket *newsock;
Al Viro56b31d12012-08-18 00:25:51 -04004344 struct file *newfile;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004345 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004346
Neil Horman408f22e2007-06-16 14:03:45 -04004347 if (len < sizeof(sctp_peeloff_arg_t))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004348 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004349 len = sizeof(sctp_peeloff_arg_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004350 if (copy_from_user(&peeloff, optval, len))
4351 return -EFAULT;
4352
Benjamin Poirier0343c552012-03-08 05:55:58 +00004353 retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004354 if (retval < 0)
4355 goto out;
4356
4357 /* Map the socket to an unused fd that can be returned to the user. */
Yann Droneaud8a59bd32013-07-02 18:39:36 +02004358 retval = get_unused_fd_flags(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004359 if (retval < 0) {
4360 sock_release(newsock);
4361 goto out;
4362 }
4363
Linus Torvaldsaab174f2012-10-02 20:25:04 -07004364 newfile = sock_alloc_file(newsock, 0, NULL);
Al Viro56b31d12012-08-18 00:25:51 -04004365 if (unlikely(IS_ERR(newfile))) {
4366 put_unused_fd(retval);
4367 sock_release(newsock);
4368 return PTR_ERR(newfile);
4369 }
4370
Daniel Borkmannbb333812013-06-28 19:49:40 +02004371 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
4372 retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004373
4374 /* Return the fd mapped to the new socket. */
Al Viro56b31d12012-08-18 00:25:51 -04004375 if (put_user(len, optlen)) {
4376 fput(newfile);
4377 put_unused_fd(retval);
Neil Horman408f22e2007-06-16 14:03:45 -04004378 return -EFAULT;
Al Viro56b31d12012-08-18 00:25:51 -04004379 }
4380 peeloff.sd = retval;
4381 if (copy_to_user(optval, &peeloff, len)) {
4382 fput(newfile);
4383 put_unused_fd(retval);
4384 return -EFAULT;
4385 }
4386 fd_install(retval, newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004387out:
4388 return retval;
4389}
4390
4391/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4392 *
4393 * Applications can enable or disable heartbeats for any peer address of
4394 * an association, modify an address's heartbeat interval, force a
4395 * heartbeat to be sent immediately, and adjust the address's maximum
4396 * number of retransmissions sent before an address is considered
4397 * unreachable. The following structure is used to access and modify an
4398 * address's parameters:
4399 *
4400 * struct sctp_paddrparams {
Frank Filz52ccb8e2005-12-22 11:36:46 -08004401 * sctp_assoc_t spp_assoc_id;
4402 * struct sockaddr_storage spp_address;
4403 * uint32_t spp_hbinterval;
4404 * uint16_t spp_pathmaxrxt;
4405 * uint32_t spp_pathmtu;
4406 * uint32_t spp_sackdelay;
4407 * uint32_t spp_flags;
4408 * };
Linus Torvalds1da177e2005-04-16 15:20:36 -07004409 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08004410 * spp_assoc_id - (one-to-many style socket) This is filled in the
4411 * application, and identifies the association for
4412 * this query.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004413 * spp_address - This specifies which address is of interest.
4414 * spp_hbinterval - This contains the value of the heartbeat interval,
Frank Filz52ccb8e2005-12-22 11:36:46 -08004415 * in milliseconds. If a value of zero
4416 * is present in this field then no changes are to
4417 * be made to this parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004418 * spp_pathmaxrxt - This contains the maximum number of
4419 * retransmissions before this address shall be
Frank Filz52ccb8e2005-12-22 11:36:46 -08004420 * considered unreachable. If a value of zero
4421 * is present in this field then no changes are to
4422 * be made to this parameter.
4423 * spp_pathmtu - When Path MTU discovery is disabled the value
4424 * specified here will be the "fixed" path mtu.
4425 * Note that if the spp_address field is empty
4426 * then all associations on this address will
4427 * have this fixed path mtu set upon them.
4428 *
4429 * spp_sackdelay - When delayed sack is enabled, this value specifies
4430 * the number of milliseconds that sacks will be delayed
4431 * for. This value will apply to all addresses of an
4432 * association if the spp_address field is empty. Note
4433 * also, that if delayed sack is enabled and this
4434 * value is set to 0, no change is made to the last
4435 * recorded delayed sack timer value.
4436 *
4437 * spp_flags - These flags are used to control various features
4438 * on an association. The flag field may contain
4439 * zero or more of the following options.
4440 *
4441 * SPP_HB_ENABLE - Enable heartbeats on the
4442 * specified address. Note that if the address
4443 * field is empty all addresses for the association
4444 * have heartbeats enabled upon them.
4445 *
4446 * SPP_HB_DISABLE - Disable heartbeats on the
4447 * speicifed address. Note that if the address
4448 * field is empty all addresses for the association
4449 * will have their heartbeats disabled. Note also
4450 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4451 * mutually exclusive, only one of these two should
4452 * be specified. Enabling both fields will have
4453 * undetermined results.
4454 *
4455 * SPP_HB_DEMAND - Request a user initiated heartbeat
4456 * to be made immediately.
4457 *
4458 * SPP_PMTUD_ENABLE - This field will enable PMTU
4459 * discovery upon the specified address. Note that
4460 * if the address feild is empty then all addresses
4461 * on the association are effected.
4462 *
4463 * SPP_PMTUD_DISABLE - This field will disable PMTU
4464 * discovery upon the specified address. Note that
4465 * if the address feild is empty then all addresses
4466 * on the association are effected. Not also that
4467 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4468 * exclusive. Enabling both will have undetermined
4469 * results.
4470 *
4471 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4472 * on delayed sack. The time specified in spp_sackdelay
4473 * is used to specify the sack delay for this address. Note
4474 * that if spp_address is empty then all addresses will
4475 * enable delayed sack and take on the sack delay
4476 * value specified in spp_sackdelay.
4477 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4478 * off delayed sack. If the spp_address field is blank then
4479 * delayed sack is disabled for the entire association. Note
4480 * also that this field is mutually exclusive to
4481 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4482 * results.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004483 */
4484static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
Frank Filz52ccb8e2005-12-22 11:36:46 -08004485 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004486{
Frank Filz52ccb8e2005-12-22 11:36:46 -08004487 struct sctp_paddrparams params;
4488 struct sctp_transport *trans = NULL;
4489 struct sctp_association *asoc = NULL;
4490 struct sctp_sock *sp = sctp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004491
Neil Horman408f22e2007-06-16 14:03:45 -04004492 if (len < sizeof(struct sctp_paddrparams))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004493 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004494 len = sizeof(struct sctp_paddrparams);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004495 if (copy_from_user(&params, optval, len))
4496 return -EFAULT;
4497
Frank Filz52ccb8e2005-12-22 11:36:46 -08004498 /* If an address other than INADDR_ANY is specified, and
4499 * no transport is found, then the request is invalid.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004500 */
wangweidongcb3f8372013-12-23 12:16:50 +08004501 if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08004502 trans = sctp_addr_id2transport(sk, &params.spp_address,
4503 params.spp_assoc_id);
4504 if (!trans) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02004505 pr_debug("%s: failed no transport\n", __func__);
Frank Filz52ccb8e2005-12-22 11:36:46 -08004506 return -EINVAL;
4507 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004508 }
4509
Frank Filz52ccb8e2005-12-22 11:36:46 -08004510 /* Get association, if assoc_id != 0 and the socket is a one
4511 * to many style socket, and an association was not found, then
4512 * the id was invalid.
4513 */
4514 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4515 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02004516 pr_debug("%s: failed no association\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004517 return -EINVAL;
Frank Filz52ccb8e2005-12-22 11:36:46 -08004518 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004519
Frank Filz52ccb8e2005-12-22 11:36:46 -08004520 if (trans) {
4521 /* Fetch transport values. */
4522 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4523 params.spp_pathmtu = trans->pathmtu;
4524 params.spp_pathmaxrxt = trans->pathmaxrxt;
4525 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004526
Frank Filz52ccb8e2005-12-22 11:36:46 -08004527 /*draft-11 doesn't say what to return in spp_flags*/
4528 params.spp_flags = trans->param_flags;
4529 } else if (asoc) {
4530 /* Fetch association values. */
4531 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4532 params.spp_pathmtu = asoc->pathmtu;
4533 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4534 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004535
Frank Filz52ccb8e2005-12-22 11:36:46 -08004536 /*draft-11 doesn't say what to return in spp_flags*/
4537 params.spp_flags = asoc->param_flags;
4538 } else {
4539 /* Fetch socket values. */
4540 params.spp_hbinterval = sp->hbinterval;
4541 params.spp_pathmtu = sp->pathmtu;
4542 params.spp_sackdelay = sp->sackdelay;
4543 params.spp_pathmaxrxt = sp->pathmaxrxt;
4544
4545 /*draft-11 doesn't say what to return in spp_flags*/
4546 params.spp_flags = sp->param_flags;
4547 }
4548
Linus Torvalds1da177e2005-04-16 15:20:36 -07004549 if (copy_to_user(optval, &params, len))
4550 return -EFAULT;
4551
4552 if (put_user(len, optlen))
4553 return -EFAULT;
4554
4555 return 0;
4556}
4557
Wei Yongjund364d922008-05-09 15:13:26 -07004558/*
4559 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
Frank Filz77086102005-12-22 11:37:30 -08004560 *
Wei Yongjund364d922008-05-09 15:13:26 -07004561 * This option will effect the way delayed acks are performed. This
4562 * option allows you to get or set the delayed ack time, in
4563 * milliseconds. It also allows changing the delayed ack frequency.
4564 * Changing the frequency to 1 disables the delayed sack algorithm. If
4565 * the assoc_id is 0, then this sets or gets the endpoints default
4566 * values. If the assoc_id field is non-zero, then the set or get
4567 * effects the specified association for the one to many model (the
4568 * assoc_id field is ignored by the one to one model). Note that if
4569 * sack_delay or sack_freq are 0 when setting this option, then the
4570 * current values will remain unchanged.
Frank Filz77086102005-12-22 11:37:30 -08004571 *
Wei Yongjund364d922008-05-09 15:13:26 -07004572 * struct sctp_sack_info {
4573 * sctp_assoc_t sack_assoc_id;
4574 * uint32_t sack_delay;
4575 * uint32_t sack_freq;
4576 * };
Frank Filz77086102005-12-22 11:37:30 -08004577 *
Wei Yongjund364d922008-05-09 15:13:26 -07004578 * sack_assoc_id - This parameter, indicates which association the user
4579 * is performing an action upon. Note that if this field's value is
4580 * zero then the endpoints default value is changed (effecting future
4581 * associations only).
Frank Filz77086102005-12-22 11:37:30 -08004582 *
Wei Yongjund364d922008-05-09 15:13:26 -07004583 * sack_delay - This parameter contains the number of milliseconds that
4584 * the user is requesting the delayed ACK timer be set to. Note that
4585 * this value is defined in the standard to be between 200 and 500
4586 * milliseconds.
Frank Filz77086102005-12-22 11:37:30 -08004587 *
Wei Yongjund364d922008-05-09 15:13:26 -07004588 * sack_freq - This parameter contains the number of packets that must
4589 * be received before a sack is sent without waiting for the delay
4590 * timer to expire. The default value for this is 2, setting this
4591 * value to 1 will disable the delayed sack algorithm.
Frank Filz77086102005-12-22 11:37:30 -08004592 */
Wei Yongjund364d922008-05-09 15:13:26 -07004593static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
Frank Filz77086102005-12-22 11:37:30 -08004594 char __user *optval,
4595 int __user *optlen)
4596{
Wei Yongjund364d922008-05-09 15:13:26 -07004597 struct sctp_sack_info params;
Frank Filz77086102005-12-22 11:37:30 -08004598 struct sctp_association *asoc = NULL;
4599 struct sctp_sock *sp = sctp_sk(sk);
4600
Wei Yongjund364d922008-05-09 15:13:26 -07004601 if (len >= sizeof(struct sctp_sack_info)) {
4602 len = sizeof(struct sctp_sack_info);
4603
4604 if (copy_from_user(&params, optval, len))
4605 return -EFAULT;
4606 } else if (len == sizeof(struct sctp_assoc_value)) {
Neil Horman94f65192013-12-23 08:29:43 -05004607 pr_warn_ratelimited(DEPRECATED
Neil Hormanf916ec92014-01-02 12:54:27 -05004608 "%s (pid %d) "
Neil Horman94f65192013-12-23 08:29:43 -05004609 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
Neil Hormanf916ec92014-01-02 12:54:27 -05004610 "Use struct sctp_sack_info instead\n",
4611 current->comm, task_pid_nr(current));
Wei Yongjund364d922008-05-09 15:13:26 -07004612 if (copy_from_user(&params, optval, len))
4613 return -EFAULT;
4614 } else
wangweidongcb3f8372013-12-23 12:16:50 +08004615 return -EINVAL;
Frank Filz77086102005-12-22 11:37:30 -08004616
Wei Yongjund364d922008-05-09 15:13:26 -07004617 /* Get association, if sack_assoc_id != 0 and the socket is a one
Frank Filz77086102005-12-22 11:37:30 -08004618 * to many style socket, and an association was not found, then
4619 * the id was invalid.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004620 */
Wei Yongjund364d922008-05-09 15:13:26 -07004621 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4622 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
Frank Filz77086102005-12-22 11:37:30 -08004623 return -EINVAL;
4624
4625 if (asoc) {
4626 /* Fetch association values. */
Wei Yongjund364d922008-05-09 15:13:26 -07004627 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4628 params.sack_delay = jiffies_to_msecs(
Frank Filz77086102005-12-22 11:37:30 -08004629 asoc->sackdelay);
Wei Yongjund364d922008-05-09 15:13:26 -07004630 params.sack_freq = asoc->sackfreq;
4631
4632 } else {
4633 params.sack_delay = 0;
4634 params.sack_freq = 1;
4635 }
Frank Filz77086102005-12-22 11:37:30 -08004636 } else {
4637 /* Fetch socket values. */
Wei Yongjund364d922008-05-09 15:13:26 -07004638 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4639 params.sack_delay = sp->sackdelay;
4640 params.sack_freq = sp->sackfreq;
4641 } else {
4642 params.sack_delay = 0;
4643 params.sack_freq = 1;
4644 }
Frank Filz77086102005-12-22 11:37:30 -08004645 }
4646
4647 if (copy_to_user(optval, &params, len))
4648 return -EFAULT;
4649
4650 if (put_user(len, optlen))
4651 return -EFAULT;
4652
4653 return 0;
4654}
4655
Linus Torvalds1da177e2005-04-16 15:20:36 -07004656/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4657 *
4658 * Applications can specify protocol parameters for the default association
4659 * initialization. The option name argument to setsockopt() and getsockopt()
4660 * is SCTP_INITMSG.
4661 *
4662 * Setting initialization parameters is effective only on an unconnected
4663 * socket (for UDP-style sockets only future associations are effected
4664 * by the change). With TCP-style sockets, this option is inherited by
4665 * sockets derived from a listener socket.
4666 */
4667static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4668{
Neil Horman408f22e2007-06-16 14:03:45 -04004669 if (len < sizeof(struct sctp_initmsg))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004670 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004671 len = sizeof(struct sctp_initmsg);
4672 if (put_user(len, optlen))
4673 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004674 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4675 return -EFAULT;
4676 return 0;
4677}
4678
Linus Torvalds1da177e2005-04-16 15:20:36 -07004679
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004680static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4681 char __user *optval, int __user *optlen)
4682{
4683 struct sctp_association *asoc;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004684 int cnt = 0;
4685 struct sctp_getaddrs getaddrs;
4686 struct sctp_transport *from;
4687 void __user *to;
4688 union sctp_addr temp;
4689 struct sctp_sock *sp = sctp_sk(sk);
4690 int addrlen;
4691 size_t space_left;
4692 int bytes_copied;
4693
4694 if (len < sizeof(struct sctp_getaddrs))
4695 return -EINVAL;
4696
4697 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4698 return -EFAULT;
4699
4700 /* For UDP-style sockets, id specifies the association to query. */
4701 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4702 if (!asoc)
4703 return -EINVAL;
4704
wangweidongcb3f8372013-12-23 12:16:50 +08004705 to = optval + offsetof(struct sctp_getaddrs, addrs);
4706 space_left = len - offsetof(struct sctp_getaddrs, addrs);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004707
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07004708 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4709 transports) {
Al Virob3f5b3b2006-11-20 17:22:43 -08004710 memcpy(&temp, &from->ipaddr, sizeof(temp));
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004711 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
Vlad Yasevicha5f4cea2010-04-30 21:42:42 -04004712 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004713 if (space_left < addrlen)
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004714 return -ENOMEM;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004715 if (copy_to_user(to, &temp, addrlen))
4716 return -EFAULT;
4717 to += addrlen;
4718 cnt++;
4719 space_left -= addrlen;
4720 }
4721
4722 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4723 return -EFAULT;
4724 bytes_copied = ((char __user *)to) - optval;
4725 if (put_user(bytes_copied, optlen))
4726 return -EFAULT;
4727
4728 return 0;
4729}
4730
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004731static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4732 size_t space_left, int *bytes_copied)
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004733{
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004734 struct sctp_sockaddr_entry *addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004735 union sctp_addr temp;
4736 int cnt = 0;
4737 int addrlen;
Eric W. Biederman4db67e82012-08-06 08:42:04 +00004738 struct net *net = sock_net(sk);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004739
Vlad Yasevich29303542007-09-16 16:02:12 -07004740 rcu_read_lock();
Eric W. Biederman4db67e82012-08-06 08:42:04 +00004741 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
Vlad Yasevich29303542007-09-16 16:02:12 -07004742 if (!addr->valid)
4743 continue;
4744
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004745 if ((PF_INET == sk->sk_family) &&
Al Viro6244be42006-11-20 17:21:44 -08004746 (AF_INET6 == addr->a.sa.sa_family))
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004747 continue;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07004748 if ((PF_INET6 == sk->sk_family) &&
4749 inet_v6_ipv6only(sk) &&
4750 (AF_INET == addr->a.sa.sa_family))
4751 continue;
Al Viro6244be42006-11-20 17:21:44 -08004752 memcpy(&temp, &addr->a, sizeof(temp));
Vlad Yasevichb46ae362008-01-28 14:25:36 -05004753 if (!temp.v4.sin_port)
4754 temp.v4.sin_port = htons(port);
4755
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004756 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4757 &temp);
4758 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
Vlad Yasevich29303542007-09-16 16:02:12 -07004759 if (space_left < addrlen) {
4760 cnt = -ENOMEM;
4761 break;
4762 }
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004763 memcpy(to, &temp, addrlen);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -08004764
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004765 to += addrlen;
wangweidongcb3f8372013-12-23 12:16:50 +08004766 cnt++;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004767 space_left -= addrlen;
Vlad Yasevich3663c302007-07-03 12:43:12 -04004768 *bytes_copied += addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004769 }
Vlad Yasevich29303542007-09-16 16:02:12 -07004770 rcu_read_unlock();
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004771
4772 return cnt;
4773}
4774
Linus Torvalds1da177e2005-04-16 15:20:36 -07004775
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004776static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4777 char __user *optval, int __user *optlen)
4778{
4779 struct sctp_bind_addr *bp;
4780 struct sctp_association *asoc;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004781 int cnt = 0;
4782 struct sctp_getaddrs getaddrs;
4783 struct sctp_sockaddr_entry *addr;
4784 void __user *to;
4785 union sctp_addr temp;
4786 struct sctp_sock *sp = sctp_sk(sk);
4787 int addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004788 int err = 0;
4789 size_t space_left;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004790 int bytes_copied = 0;
4791 void *addrs;
Vlad Yasevich70b57b82007-05-09 13:51:31 -07004792 void *buf;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004793
Neil Horman408f22e2007-06-16 14:03:45 -04004794 if (len < sizeof(struct sctp_getaddrs))
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004795 return -EINVAL;
4796
4797 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4798 return -EFAULT;
4799
4800 /*
4801 * For UDP-style sockets, id specifies the association to query.
4802 * If the id field is set to the value '0' then the locally bound
4803 * addresses are returned without regard to any particular
4804 * association.
4805 */
4806 if (0 == getaddrs.assoc_id) {
4807 bp = &sctp_sk(sk)->ep->base.bind_addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004808 } else {
4809 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4810 if (!asoc)
4811 return -EINVAL;
4812 bp = &asoc->base.bind_addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004813 }
4814
wangweidongcb3f8372013-12-23 12:16:50 +08004815 to = optval + offsetof(struct sctp_getaddrs, addrs);
4816 space_left = len - offsetof(struct sctp_getaddrs, addrs);
Neil Horman186e2342007-06-18 19:59:16 -04004817
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004818 addrs = kmalloc(space_left, GFP_KERNEL);
4819 if (!addrs)
4820 return -ENOMEM;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004821
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004822 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4823 * addresses from the global local address list.
4824 */
4825 if (sctp_list_single_entry(&bp->address_list)) {
4826 addr = list_entry(bp->address_list.next,
4827 struct sctp_sockaddr_entry, list);
Vlad Yasevich52cae8f2008-08-18 10:34:34 -04004828 if (sctp_is_any(sk, &addr->a)) {
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004829 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4830 space_left, &bytes_copied);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004831 if (cnt < 0) {
4832 err = cnt;
Vlad Yasevich559cf712007-09-16 16:03:28 -07004833 goto out;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004834 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004835 goto copy_getaddrs;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004836 }
4837 }
4838
Vlad Yasevich70b57b82007-05-09 13:51:31 -07004839 buf = addrs;
Vlad Yasevich559cf712007-09-16 16:03:28 -07004840 /* Protection on the bound address list is not needed since
4841 * in the socket option context we hold a socket lock and
4842 * thus the bound address list can't change.
4843 */
4844 list_for_each_entry(addr, &bp->address_list, list) {
Al Viro6244be42006-11-20 17:21:44 -08004845 memcpy(&temp, &addr->a, sizeof(temp));
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004846 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4847 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004848 if (space_left < addrlen) {
4849 err = -ENOMEM; /*fixme: right error?*/
Vlad Yasevich559cf712007-09-16 16:03:28 -07004850 goto out;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004851 }
Vlad Yasevich70b57b82007-05-09 13:51:31 -07004852 memcpy(buf, &temp, addrlen);
4853 buf += addrlen;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004854 bytes_copied += addrlen;
wangweidongcb3f8372013-12-23 12:16:50 +08004855 cnt++;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004856 space_left -= addrlen;
4857 }
4858
4859copy_getaddrs:
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004860 if (copy_to_user(to, addrs, bytes_copied)) {
4861 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02004862 goto out;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004863 }
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04004864 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4865 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02004866 goto out;
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04004867 }
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004868 if (put_user(bytes_copied, optlen))
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04004869 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02004870out:
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004871 kfree(addrs);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004872 return err;
4873}
4874
Linus Torvalds1da177e2005-04-16 15:20:36 -07004875/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4876 *
4877 * Requests that the local SCTP stack use the enclosed peer address as
4878 * the association primary. The enclosed address must be one of the
4879 * association peer's addresses.
4880 */
4881static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4882 char __user *optval, int __user *optlen)
4883{
4884 struct sctp_prim prim;
4885 struct sctp_association *asoc;
4886 struct sctp_sock *sp = sctp_sk(sk);
4887
Neil Horman408f22e2007-06-16 14:03:45 -04004888 if (len < sizeof(struct sctp_prim))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004889 return -EINVAL;
4890
Neil Horman408f22e2007-06-16 14:03:45 -04004891 len = sizeof(struct sctp_prim);
4892
4893 if (copy_from_user(&prim, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004894 return -EFAULT;
4895
4896 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4897 if (!asoc)
4898 return -EINVAL;
4899
4900 if (!asoc->peer.primary_path)
4901 return -ENOTCONN;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004902
Al Viro8cec6b82006-11-20 17:23:01 -08004903 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4904 asoc->peer.primary_path->af_specific->sockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004905
4906 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4907 (union sctp_addr *)&prim.ssp_addr);
4908
Neil Horman408f22e2007-06-16 14:03:45 -04004909 if (put_user(len, optlen))
4910 return -EFAULT;
4911 if (copy_to_user(optval, &prim, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004912 return -EFAULT;
4913
4914 return 0;
4915}
4916
4917/*
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004918 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004919 *
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004920 * Requests that the local endpoint set the specified Adaptation Layer
Linus Torvalds1da177e2005-04-16 15:20:36 -07004921 * Indication parameter for all future INIT and INIT-ACK exchanges.
4922 */
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004923static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004924 char __user *optval, int __user *optlen)
4925{
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004926 struct sctp_setadaptation adaptation;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004927
Neil Horman408f22e2007-06-16 14:03:45 -04004928 if (len < sizeof(struct sctp_setadaptation))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004929 return -EINVAL;
4930
Neil Horman408f22e2007-06-16 14:03:45 -04004931 len = sizeof(struct sctp_setadaptation);
4932
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004933 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
Neil Horman408f22e2007-06-16 14:03:45 -04004934
4935 if (put_user(len, optlen))
4936 return -EFAULT;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004937 if (copy_to_user(optval, &adaptation, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004938 return -EFAULT;
Ivan Skytte Jorgensena1ab3582005-10-28 15:33:24 -07004939
Linus Torvalds1da177e2005-04-16 15:20:36 -07004940 return 0;
4941}
4942
4943/*
4944 *
4945 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4946 *
4947 * Applications that wish to use the sendto() system call may wish to
4948 * specify a default set of parameters that would normally be supplied
4949 * through the inclusion of ancillary data. This socket option allows
4950 * such an application to set the default sctp_sndrcvinfo structure.
4951
4952
4953 * The application that wishes to use this socket option simply passes
4954 * in to this call the sctp_sndrcvinfo structure defined in Section
4955 * 5.2.2) The input parameters accepted by this call include
4956 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4957 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4958 * to this call if the caller is using the UDP model.
4959 *
4960 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4961 */
4962static int sctp_getsockopt_default_send_param(struct sock *sk,
4963 int len, char __user *optval,
4964 int __user *optlen)
4965{
4966 struct sctp_sndrcvinfo info;
4967 struct sctp_association *asoc;
4968 struct sctp_sock *sp = sctp_sk(sk);
4969
Neil Horman408f22e2007-06-16 14:03:45 -04004970 if (len < sizeof(struct sctp_sndrcvinfo))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004971 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004972
4973 len = sizeof(struct sctp_sndrcvinfo);
4974
4975 if (copy_from_user(&info, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004976 return -EFAULT;
4977
4978 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4979 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4980 return -EINVAL;
4981
4982 if (asoc) {
4983 info.sinfo_stream = asoc->default_stream;
4984 info.sinfo_flags = asoc->default_flags;
4985 info.sinfo_ppid = asoc->default_ppid;
4986 info.sinfo_context = asoc->default_context;
4987 info.sinfo_timetolive = asoc->default_timetolive;
4988 } else {
4989 info.sinfo_stream = sp->default_stream;
4990 info.sinfo_flags = sp->default_flags;
4991 info.sinfo_ppid = sp->default_ppid;
4992 info.sinfo_context = sp->default_context;
4993 info.sinfo_timetolive = sp->default_timetolive;
4994 }
4995
Neil Horman408f22e2007-06-16 14:03:45 -04004996 if (put_user(len, optlen))
4997 return -EFAULT;
4998 if (copy_to_user(optval, &info, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004999 return -EFAULT;
5000
5001 return 0;
5002}
5003
5004/*
5005 *
5006 * 7.1.5 SCTP_NODELAY
5007 *
5008 * Turn on/off any Nagle-like algorithm. This means that packets are
5009 * generally sent as soon as possible and no unnecessary delays are
5010 * introduced, at the cost of more packets in the network. Expects an
5011 * integer boolean flag.
5012 */
5013
5014static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5015 char __user *optval, int __user *optlen)
5016{
5017 int val;
5018
5019 if (len < sizeof(int))
5020 return -EINVAL;
5021
5022 len = sizeof(int);
5023 val = (sctp_sk(sk)->nodelay == 1);
5024 if (put_user(len, optlen))
5025 return -EFAULT;
5026 if (copy_to_user(optval, &val, len))
5027 return -EFAULT;
5028 return 0;
5029}
5030
5031/*
5032 *
5033 * 7.1.1 SCTP_RTOINFO
5034 *
5035 * The protocol parameters used to initialize and bound retransmission
5036 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5037 * and modify these parameters.
5038 * All parameters are time values, in milliseconds. A value of 0, when
5039 * modifying the parameters, indicates that the current value should not
5040 * be changed.
5041 *
5042 */
5043static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5044 char __user *optval,
5045 int __user *optlen) {
5046 struct sctp_rtoinfo rtoinfo;
5047 struct sctp_association *asoc;
5048
Neil Horman408f22e2007-06-16 14:03:45 -04005049 if (len < sizeof (struct sctp_rtoinfo))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005050 return -EINVAL;
5051
Neil Horman408f22e2007-06-16 14:03:45 -04005052 len = sizeof(struct sctp_rtoinfo);
5053
5054 if (copy_from_user(&rtoinfo, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005055 return -EFAULT;
5056
5057 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5058
5059 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5060 return -EINVAL;
5061
5062 /* Values corresponding to the specific association. */
5063 if (asoc) {
5064 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5065 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5066 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5067 } else {
5068 /* Values corresponding to the endpoint. */
5069 struct sctp_sock *sp = sctp_sk(sk);
5070
5071 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5072 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5073 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5074 }
5075
5076 if (put_user(len, optlen))
5077 return -EFAULT;
5078
5079 if (copy_to_user(optval, &rtoinfo, len))
5080 return -EFAULT;
5081
5082 return 0;
5083}
5084
5085/*
5086 *
5087 * 7.1.2 SCTP_ASSOCINFO
5088 *
Michael Opdenacker59c51592007-05-09 08:57:56 +02005089 * This option is used to tune the maximum retransmission attempts
Linus Torvalds1da177e2005-04-16 15:20:36 -07005090 * of the association.
5091 * Returns an error if the new association retransmission value is
5092 * greater than the sum of the retransmission value of the peer.
5093 * See [SCTP] for more information.
5094 *
5095 */
5096static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5097 char __user *optval,
5098 int __user *optlen)
5099{
5100
5101 struct sctp_assocparams assocparams;
5102 struct sctp_association *asoc;
5103 struct list_head *pos;
5104 int cnt = 0;
5105
Neil Horman408f22e2007-06-16 14:03:45 -04005106 if (len < sizeof (struct sctp_assocparams))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005107 return -EINVAL;
5108
Neil Horman408f22e2007-06-16 14:03:45 -04005109 len = sizeof(struct sctp_assocparams);
5110
5111 if (copy_from_user(&assocparams, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005112 return -EFAULT;
5113
5114 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5115
5116 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5117 return -EINVAL;
5118
5119 /* Values correspoinding to the specific association */
Vladislav Yasevich17337212005-04-28 11:57:54 -07005120 if (asoc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005121 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5122 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5123 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
Daniel Borkmann52db8822013-06-25 18:17:27 +02005124 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005125
5126 list_for_each(pos, &asoc->peer.transport_addr_list) {
wangweidongcb3f8372013-12-23 12:16:50 +08005127 cnt++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005128 }
5129
5130 assocparams.sasoc_number_peer_destinations = cnt;
5131 } else {
5132 /* Values corresponding to the endpoint */
5133 struct sctp_sock *sp = sctp_sk(sk);
5134
5135 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5136 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5137 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5138 assocparams.sasoc_cookie_life =
5139 sp->assocparams.sasoc_cookie_life;
5140 assocparams.sasoc_number_peer_destinations =
5141 sp->assocparams.
5142 sasoc_number_peer_destinations;
5143 }
5144
5145 if (put_user(len, optlen))
5146 return -EFAULT;
5147
5148 if (copy_to_user(optval, &assocparams, len))
5149 return -EFAULT;
5150
5151 return 0;
5152}
5153
5154/*
5155 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5156 *
5157 * This socket option is a boolean flag which turns on or off mapped V4
5158 * addresses. If this option is turned on and the socket is type
5159 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5160 * If this option is turned off, then no mapping will be done of V4
5161 * addresses and a user will receive both PF_INET6 and PF_INET type
5162 * addresses on the socket.
5163 */
5164static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5165 char __user *optval, int __user *optlen)
5166{
5167 int val;
5168 struct sctp_sock *sp = sctp_sk(sk);
5169
5170 if (len < sizeof(int))
5171 return -EINVAL;
5172
5173 len = sizeof(int);
5174 val = sp->v4mapped;
5175 if (put_user(len, optlen))
5176 return -EFAULT;
5177 if (copy_to_user(optval, &val, len))
5178 return -EFAULT;
5179
5180 return 0;
5181}
5182
5183/*
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005184 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5185 * (chapter and verse is quoted at sctp_setsockopt_context())
5186 */
5187static int sctp_getsockopt_context(struct sock *sk, int len,
5188 char __user *optval, int __user *optlen)
5189{
5190 struct sctp_assoc_value params;
5191 struct sctp_sock *sp;
5192 struct sctp_association *asoc;
5193
Neil Horman408f22e2007-06-16 14:03:45 -04005194 if (len < sizeof(struct sctp_assoc_value))
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005195 return -EINVAL;
5196
Neil Horman408f22e2007-06-16 14:03:45 -04005197 len = sizeof(struct sctp_assoc_value);
5198
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005199 if (copy_from_user(&params, optval, len))
5200 return -EFAULT;
5201
5202 sp = sctp_sk(sk);
5203
5204 if (params.assoc_id != 0) {
5205 asoc = sctp_id2assoc(sk, params.assoc_id);
5206 if (!asoc)
5207 return -EINVAL;
5208 params.assoc_value = asoc->default_rcv_context;
5209 } else {
5210 params.assoc_value = sp->default_rcv_context;
5211 }
5212
5213 if (put_user(len, optlen))
5214 return -EFAULT;
5215 if (copy_to_user(optval, &params, len))
5216 return -EFAULT;
5217
5218 return 0;
5219}
5220
5221/*
Wei Yongjune89c2092008-12-25 16:54:58 -08005222 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5223 * This option will get or set the maximum size to put in any outgoing
5224 * SCTP DATA chunk. If a message is larger than this size it will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07005225 * fragmented by SCTP into the specified size. Note that the underlying
5226 * SCTP implementation may fragment into smaller sized chunks when the
5227 * PMTU of the underlying association is smaller than the value set by
Wei Yongjune89c2092008-12-25 16:54:58 -08005228 * the user. The default value for this option is '0' which indicates
5229 * the user is NOT limiting fragmentation and only the PMTU will effect
5230 * SCTP's choice of DATA chunk size. Note also that values set larger
5231 * than the maximum size of an IP datagram will effectively let SCTP
5232 * control fragmentation (i.e. the same as setting this option to 0).
5233 *
5234 * The following structure is used to access and modify this parameter:
5235 *
5236 * struct sctp_assoc_value {
5237 * sctp_assoc_t assoc_id;
5238 * uint32_t assoc_value;
5239 * };
5240 *
5241 * assoc_id: This parameter is ignored for one-to-one style sockets.
5242 * For one-to-many style sockets this parameter indicates which
5243 * association the user is performing an action upon. Note that if
5244 * this field's value is zero then the endpoints default value is
5245 * changed (effecting future associations only).
5246 * assoc_value: This parameter specifies the maximum size in bytes.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005247 */
5248static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5249 char __user *optval, int __user *optlen)
5250{
Wei Yongjune89c2092008-12-25 16:54:58 -08005251 struct sctp_assoc_value params;
5252 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005253
Wei Yongjune89c2092008-12-25 16:54:58 -08005254 if (len == sizeof(int)) {
Neil Horman94f65192013-12-23 08:29:43 -05005255 pr_warn_ratelimited(DEPRECATED
Neil Hormanf916ec92014-01-02 12:54:27 -05005256 "%s (pid %d) "
Neil Horman94f65192013-12-23 08:29:43 -05005257 "Use of int in maxseg socket option.\n"
Neil Hormanf916ec92014-01-02 12:54:27 -05005258 "Use struct sctp_assoc_value instead\n",
5259 current->comm, task_pid_nr(current));
Wei Yongjune89c2092008-12-25 16:54:58 -08005260 params.assoc_id = 0;
5261 } else if (len >= sizeof(struct sctp_assoc_value)) {
5262 len = sizeof(struct sctp_assoc_value);
5263 if (copy_from_user(&params, optval, sizeof(params)))
5264 return -EFAULT;
5265 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07005266 return -EINVAL;
5267
Wei Yongjune89c2092008-12-25 16:54:58 -08005268 asoc = sctp_id2assoc(sk, params.assoc_id);
5269 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5270 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005271
Wei Yongjune89c2092008-12-25 16:54:58 -08005272 if (asoc)
5273 params.assoc_value = asoc->frag_point;
5274 else
5275 params.assoc_value = sctp_sk(sk)->user_frag;
5276
Linus Torvalds1da177e2005-04-16 15:20:36 -07005277 if (put_user(len, optlen))
5278 return -EFAULT;
Wei Yongjune89c2092008-12-25 16:54:58 -08005279 if (len == sizeof(int)) {
5280 if (copy_to_user(optval, &params.assoc_value, len))
5281 return -EFAULT;
5282 } else {
5283 if (copy_to_user(optval, &params, len))
5284 return -EFAULT;
5285 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005286
5287 return 0;
5288}
5289
Vlad Yasevichb6e13312007-04-20 12:23:15 -07005290/*
5291 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5292 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5293 */
5294static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5295 char __user *optval, int __user *optlen)
5296{
5297 int val;
5298
5299 if (len < sizeof(int))
5300 return -EINVAL;
5301
5302 len = sizeof(int);
5303
5304 val = sctp_sk(sk)->frag_interleave;
5305 if (put_user(len, optlen))
5306 return -EFAULT;
5307 if (copy_to_user(optval, &val, len))
5308 return -EFAULT;
5309
5310 return 0;
5311}
5312
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005313/*
5314 * 7.1.25. Set or Get the sctp partial delivery point
5315 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5316 */
5317static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5318 char __user *optval,
5319 int __user *optlen)
5320{
YOSHIFUJI Hideaki9cbcbf42007-07-19 10:44:50 +09005321 u32 val;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005322
5323 if (len < sizeof(u32))
5324 return -EINVAL;
5325
5326 len = sizeof(u32);
5327
5328 val = sctp_sk(sk)->pd_point;
5329 if (put_user(len, optlen))
5330 return -EFAULT;
5331 if (copy_to_user(optval, &val, len))
5332 return -EFAULT;
5333
Wei Yongjun7d743b72010-12-14 16:10:41 +00005334 return 0;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005335}
5336
Vlad Yasevich70331572007-03-23 11:34:36 -07005337/*
5338 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5339 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5340 */
5341static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5342 char __user *optval,
5343 int __user *optlen)
5344{
Neil Horman219b99a2008-03-05 13:44:46 -08005345 struct sctp_assoc_value params;
5346 struct sctp_sock *sp;
5347 struct sctp_association *asoc;
Vlad Yasevich70331572007-03-23 11:34:36 -07005348
Neil Horman219b99a2008-03-05 13:44:46 -08005349 if (len == sizeof(int)) {
Neil Horman94f65192013-12-23 08:29:43 -05005350 pr_warn_ratelimited(DEPRECATED
Neil Hormanf916ec92014-01-02 12:54:27 -05005351 "%s (pid %d) "
Neil Horman94f65192013-12-23 08:29:43 -05005352 "Use of int in max_burst socket option.\n"
Neil Hormanf916ec92014-01-02 12:54:27 -05005353 "Use struct sctp_assoc_value instead\n",
5354 current->comm, task_pid_nr(current));
Neil Horman219b99a2008-03-05 13:44:46 -08005355 params.assoc_id = 0;
Wei Yongjunc6db93a2009-03-02 09:46:12 +00005356 } else if (len >= sizeof(struct sctp_assoc_value)) {
5357 len = sizeof(struct sctp_assoc_value);
Neil Horman219b99a2008-03-05 13:44:46 -08005358 if (copy_from_user(&params, optval, len))
5359 return -EFAULT;
5360 } else
5361 return -EINVAL;
Vlad Yasevich70331572007-03-23 11:34:36 -07005362
Neil Horman219b99a2008-03-05 13:44:46 -08005363 sp = sctp_sk(sk);
Vlad Yasevich70331572007-03-23 11:34:36 -07005364
Neil Horman219b99a2008-03-05 13:44:46 -08005365 if (params.assoc_id != 0) {
5366 asoc = sctp_id2assoc(sk, params.assoc_id);
5367 if (!asoc)
5368 return -EINVAL;
5369 params.assoc_value = asoc->max_burst;
5370 } else
5371 params.assoc_value = sp->max_burst;
5372
5373 if (len == sizeof(int)) {
5374 if (copy_to_user(optval, &params.assoc_value, len))
5375 return -EFAULT;
5376 } else {
5377 if (copy_to_user(optval, &params, len))
5378 return -EFAULT;
5379 }
5380
5381 return 0;
5382
Vlad Yasevich70331572007-03-23 11:34:36 -07005383}
5384
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005385static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5386 char __user *optval, int __user *optlen)
5387{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005388 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005389 struct sctp_hmacalgo __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005390 struct sctp_hmac_algo_param *hmacs;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005391 __u16 data_len = 0;
5392 u32 num_idents;
5393
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005394 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005395 return -EACCES;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005396
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005397 hmacs = ep->auth_hmacs_list;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005398 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005399
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005400 if (len < sizeof(struct sctp_hmacalgo) + data_len)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005401 return -EINVAL;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005402
5403 len = sizeof(struct sctp_hmacalgo) + data_len;
5404 num_idents = data_len / sizeof(u16);
5405
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005406 if (put_user(len, optlen))
5407 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005408 if (put_user(num_idents, &p->shmac_num_idents))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005409 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005410 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5411 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005412 return 0;
5413}
5414
5415static int sctp_getsockopt_active_key(struct sock *sk, int len,
5416 char __user *optval, int __user *optlen)
5417{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005418 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005419 struct sctp_authkeyid val;
5420 struct sctp_association *asoc;
5421
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005422 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005423 return -EACCES;
5424
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005425 if (len < sizeof(struct sctp_authkeyid))
5426 return -EINVAL;
5427 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5428 return -EFAULT;
5429
5430 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5431 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5432 return -EINVAL;
5433
5434 if (asoc)
5435 val.scact_keynumber = asoc->active_key_id;
5436 else
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005437 val.scact_keynumber = ep->active_key_id;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005438
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005439 len = sizeof(struct sctp_authkeyid);
5440 if (put_user(len, optlen))
5441 return -EFAULT;
5442 if (copy_to_user(optval, &val, len))
5443 return -EFAULT;
5444
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005445 return 0;
5446}
5447
5448static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5449 char __user *optval, int __user *optlen)
5450{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005451 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Al Viro411223c2007-10-14 19:21:20 +01005452 struct sctp_authchunks __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005453 struct sctp_authchunks val;
5454 struct sctp_association *asoc;
5455 struct sctp_chunks_param *ch;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005456 u32 num_chunks = 0;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005457 char __user *to;
5458
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005459 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005460 return -EACCES;
5461
5462 if (len < sizeof(struct sctp_authchunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005463 return -EINVAL;
5464
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005465 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005466 return -EFAULT;
5467
Al Viro411223c2007-10-14 19:21:20 +01005468 to = p->gauth_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005469 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5470 if (!asoc)
5471 return -EINVAL;
5472
5473 ch = asoc->peer.peer_chunks;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005474 if (!ch)
5475 goto num;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005476
5477 /* See if the user provided enough room for all the data */
Vlad Yasevichb40db682008-02-27 14:40:37 -05005478 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5479 if (len < num_chunks)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005480 return -EINVAL;
5481
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005482 if (copy_to_user(to, ch->chunks, num_chunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005483 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005484num:
5485 len = sizeof(struct sctp_authchunks) + num_chunks;
wangweidong8d726512013-12-23 12:16:53 +08005486 if (put_user(len, optlen))
5487 return -EFAULT;
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05005488 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5489 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005490 return 0;
5491}
5492
5493static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5494 char __user *optval, int __user *optlen)
5495{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005496 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Al Viro411223c2007-10-14 19:21:20 +01005497 struct sctp_authchunks __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005498 struct sctp_authchunks val;
5499 struct sctp_association *asoc;
5500 struct sctp_chunks_param *ch;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005501 u32 num_chunks = 0;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005502 char __user *to;
5503
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005504 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005505 return -EACCES;
5506
5507 if (len < sizeof(struct sctp_authchunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005508 return -EINVAL;
5509
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005510 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005511 return -EFAULT;
5512
Al Viro411223c2007-10-14 19:21:20 +01005513 to = p->gauth_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005514 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5515 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5516 return -EINVAL;
5517
5518 if (asoc)
wangweidong26ac8e52013-12-23 12:16:51 +08005519 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005520 else
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005521 ch = ep->auth_chunk_list;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005522
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005523 if (!ch)
5524 goto num;
5525
Vlad Yasevichb40db682008-02-27 14:40:37 -05005526 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005527 if (len < sizeof(struct sctp_authchunks) + num_chunks)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005528 return -EINVAL;
5529
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005530 if (copy_to_user(to, ch->chunks, num_chunks))
5531 return -EFAULT;
5532num:
5533 len = sizeof(struct sctp_authchunks) + num_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005534 if (put_user(len, optlen))
5535 return -EFAULT;
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05005536 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5537 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005538
5539 return 0;
5540}
5541
Wei Yongjunaea3c5c2008-12-25 16:57:24 -08005542/*
5543 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5544 * This option gets the current number of associations that are attached
5545 * to a one-to-many style socket. The option value is an uint32_t.
5546 */
5547static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5548 char __user *optval, int __user *optlen)
5549{
5550 struct sctp_sock *sp = sctp_sk(sk);
5551 struct sctp_association *asoc;
5552 u32 val = 0;
5553
5554 if (sctp_style(sk, TCP))
5555 return -EOPNOTSUPP;
5556
5557 if (len < sizeof(u32))
5558 return -EINVAL;
5559
5560 len = sizeof(u32);
5561
5562 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5563 val++;
5564 }
5565
5566 if (put_user(len, optlen))
5567 return -EFAULT;
5568 if (copy_to_user(optval, &val, len))
5569 return -EFAULT;
5570
5571 return 0;
5572}
5573
Wei Yongjun209ba422011-04-17 17:27:08 +00005574/*
Michio Honda7dc04d72011-04-26 20:16:31 +09005575 * 8.1.23 SCTP_AUTO_ASCONF
5576 * See the corresponding setsockopt entry as description
5577 */
5578static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5579 char __user *optval, int __user *optlen)
5580{
5581 int val = 0;
5582
5583 if (len < sizeof(int))
5584 return -EINVAL;
5585
5586 len = sizeof(int);
5587 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5588 val = 1;
5589 if (put_user(len, optlen))
5590 return -EFAULT;
5591 if (copy_to_user(optval, &val, len))
5592 return -EFAULT;
5593 return 0;
5594}
5595
5596/*
Wei Yongjun209ba422011-04-17 17:27:08 +00005597 * 8.2.6. Get the Current Identifiers of Associations
5598 * (SCTP_GET_ASSOC_ID_LIST)
5599 *
5600 * This option gets the current list of SCTP association identifiers of
5601 * the SCTP associations handled by a one-to-many style socket.
5602 */
5603static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5604 char __user *optval, int __user *optlen)
5605{
5606 struct sctp_sock *sp = sctp_sk(sk);
5607 struct sctp_association *asoc;
5608 struct sctp_assoc_ids *ids;
5609 u32 num = 0;
5610
5611 if (sctp_style(sk, TCP))
5612 return -EOPNOTSUPP;
5613
5614 if (len < sizeof(struct sctp_assoc_ids))
5615 return -EINVAL;
5616
5617 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5618 num++;
5619 }
5620
5621 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5622 return -EINVAL;
5623
5624 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5625
5626 ids = kmalloc(len, GFP_KERNEL);
5627 if (unlikely(!ids))
5628 return -ENOMEM;
5629
5630 ids->gaids_number_of_ids = num;
5631 num = 0;
5632 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5633 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5634 }
5635
5636 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5637 kfree(ids);
5638 return -EFAULT;
5639 }
5640
5641 kfree(ids);
5642 return 0;
5643}
5644
Neil Horman5aa93bc2012-07-21 07:56:07 +00005645/*
5646 * SCTP_PEER_ADDR_THLDS
5647 *
5648 * This option allows us to fetch the partially failed threshold for one or all
5649 * transports in an association. See Section 6.1 of:
5650 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5651 */
5652static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
5653 char __user *optval,
5654 int len,
5655 int __user *optlen)
5656{
5657 struct sctp_paddrthlds val;
5658 struct sctp_transport *trans;
5659 struct sctp_association *asoc;
5660
5661 if (len < sizeof(struct sctp_paddrthlds))
5662 return -EINVAL;
5663 len = sizeof(struct sctp_paddrthlds);
5664 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
5665 return -EFAULT;
5666
5667 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
5668 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
5669 if (!asoc)
5670 return -ENOENT;
5671
5672 val.spt_pathpfthld = asoc->pf_retrans;
5673 val.spt_pathmaxrxt = asoc->pathmaxrxt;
5674 } else {
5675 trans = sctp_addr_id2transport(sk, &val.spt_address,
5676 val.spt_assoc_id);
5677 if (!trans)
5678 return -ENOENT;
5679
5680 val.spt_pathmaxrxt = trans->pathmaxrxt;
5681 val.spt_pathpfthld = trans->pf_retrans;
5682 }
5683
5684 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
5685 return -EFAULT;
5686
5687 return 0;
5688}
5689
Michele Baldessari196d6752012-12-01 04:49:42 +00005690/*
5691 * SCTP_GET_ASSOC_STATS
5692 *
5693 * This option retrieves local per endpoint statistics. It is modeled
5694 * after OpenSolaris' implementation
5695 */
5696static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
5697 char __user *optval,
5698 int __user *optlen)
5699{
5700 struct sctp_assoc_stats sas;
5701 struct sctp_association *asoc = NULL;
5702
5703 /* User must provide at least the assoc id */
5704 if (len < sizeof(sctp_assoc_t))
5705 return -EINVAL;
5706
Guenter Roeck726bc6b2013-02-27 10:57:31 +00005707 /* Allow the struct to grow and fill in as much as possible */
5708 len = min_t(size_t, len, sizeof(sas));
5709
Michele Baldessari196d6752012-12-01 04:49:42 +00005710 if (copy_from_user(&sas, optval, len))
5711 return -EFAULT;
5712
5713 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
5714 if (!asoc)
5715 return -EINVAL;
5716
5717 sas.sas_rtxchunks = asoc->stats.rtxchunks;
5718 sas.sas_gapcnt = asoc->stats.gapcnt;
5719 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
5720 sas.sas_osacks = asoc->stats.osacks;
5721 sas.sas_isacks = asoc->stats.isacks;
5722 sas.sas_octrlchunks = asoc->stats.octrlchunks;
5723 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
5724 sas.sas_oodchunks = asoc->stats.oodchunks;
5725 sas.sas_iodchunks = asoc->stats.iodchunks;
5726 sas.sas_ouodchunks = asoc->stats.ouodchunks;
5727 sas.sas_iuodchunks = asoc->stats.iuodchunks;
5728 sas.sas_idupchunks = asoc->stats.idupchunks;
5729 sas.sas_opackets = asoc->stats.opackets;
5730 sas.sas_ipackets = asoc->stats.ipackets;
5731
5732 /* New high max rto observed, will return 0 if not a single
5733 * RTO update took place. obs_rto_ipaddr will be bogus
5734 * in such a case
5735 */
5736 sas.sas_maxrto = asoc->stats.max_obs_rto;
5737 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
5738 sizeof(struct sockaddr_storage));
5739
5740 /* Mark beginning of a new observation period */
5741 asoc->stats.max_obs_rto = asoc->rto_min;
5742
Michele Baldessari196d6752012-12-01 04:49:42 +00005743 if (put_user(len, optlen))
5744 return -EFAULT;
5745
Daniel Borkmannbb333812013-06-28 19:49:40 +02005746 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
Michele Baldessari196d6752012-12-01 04:49:42 +00005747
5748 if (copy_to_user(optval, &sas, len))
5749 return -EFAULT;
5750
5751 return 0;
5752}
5753
Daniel Borkmanndda91922013-06-17 11:40:05 +02005754static int sctp_getsockopt(struct sock *sk, int level, int optname,
5755 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005756{
5757 int retval = 0;
5758 int len;
5759
Daniel Borkmannbb333812013-06-28 19:49:40 +02005760 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005761
5762 /* I can hardly begin to describe how wrong this is. This is
5763 * so broken as to be worse than useless. The API draft
5764 * REALLY is NOT helpful here... I am not convinced that the
5765 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5766 * are at all well-founded.
5767 */
5768 if (level != SOL_SCTP) {
5769 struct sctp_af *af = sctp_sk(sk)->pf->af;
5770
5771 retval = af->getsockopt(sk, level, optname, optval, optlen);
5772 return retval;
5773 }
5774
5775 if (get_user(len, optlen))
5776 return -EFAULT;
5777
wangweidong048ed4b2014-01-21 15:44:11 +08005778 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005779
5780 switch (optname) {
5781 case SCTP_STATUS:
5782 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5783 break;
5784 case SCTP_DISABLE_FRAGMENTS:
5785 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5786 optlen);
5787 break;
5788 case SCTP_EVENTS:
5789 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5790 break;
5791 case SCTP_AUTOCLOSE:
5792 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5793 break;
5794 case SCTP_SOCKOPT_PEELOFF:
5795 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5796 break;
5797 case SCTP_PEER_ADDR_PARAMS:
5798 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5799 optlen);
5800 break;
Shan Wei4580ccc2011-01-18 22:39:00 +00005801 case SCTP_DELAYED_SACK:
Wei Yongjund364d922008-05-09 15:13:26 -07005802 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
Frank Filz77086102005-12-22 11:37:30 -08005803 optlen);
5804 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005805 case SCTP_INITMSG:
5806 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
5807 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005808 case SCTP_GET_PEER_ADDRS:
5809 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
5810 optlen);
5811 break;
5812 case SCTP_GET_LOCAL_ADDRS:
5813 retval = sctp_getsockopt_local_addrs(sk, len, optval,
5814 optlen);
5815 break;
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04005816 case SCTP_SOCKOPT_CONNECTX3:
5817 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
5818 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005819 case SCTP_DEFAULT_SEND_PARAM:
5820 retval = sctp_getsockopt_default_send_param(sk, len,
5821 optval, optlen);
5822 break;
5823 case SCTP_PRIMARY_ADDR:
5824 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
5825 break;
5826 case SCTP_NODELAY:
5827 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
5828 break;
5829 case SCTP_RTOINFO:
5830 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
5831 break;
5832 case SCTP_ASSOCINFO:
5833 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
5834 break;
5835 case SCTP_I_WANT_MAPPED_V4_ADDR:
5836 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
5837 break;
5838 case SCTP_MAXSEG:
5839 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
5840 break;
5841 case SCTP_GET_PEER_ADDR_INFO:
5842 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
5843 optlen);
5844 break;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08005845 case SCTP_ADAPTATION_LAYER:
5846 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005847 optlen);
5848 break;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005849 case SCTP_CONTEXT:
5850 retval = sctp_getsockopt_context(sk, len, optval, optlen);
5851 break;
Vlad Yasevichb6e13312007-04-20 12:23:15 -07005852 case SCTP_FRAGMENT_INTERLEAVE:
5853 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
5854 optlen);
5855 break;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005856 case SCTP_PARTIAL_DELIVERY_POINT:
5857 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
5858 optlen);
5859 break;
Vlad Yasevich70331572007-03-23 11:34:36 -07005860 case SCTP_MAX_BURST:
5861 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
5862 break;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005863 case SCTP_AUTH_KEY:
5864 case SCTP_AUTH_CHUNK:
5865 case SCTP_AUTH_DELETE_KEY:
5866 retval = -EOPNOTSUPP;
5867 break;
5868 case SCTP_HMAC_IDENT:
5869 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
5870 break;
5871 case SCTP_AUTH_ACTIVE_KEY:
5872 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
5873 break;
5874 case SCTP_PEER_AUTH_CHUNKS:
5875 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
5876 optlen);
5877 break;
5878 case SCTP_LOCAL_AUTH_CHUNKS:
5879 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
5880 optlen);
5881 break;
Wei Yongjunaea3c5c2008-12-25 16:57:24 -08005882 case SCTP_GET_ASSOC_NUMBER:
5883 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
5884 break;
Wei Yongjun209ba422011-04-17 17:27:08 +00005885 case SCTP_GET_ASSOC_ID_LIST:
5886 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
5887 break;
Michio Honda7dc04d72011-04-26 20:16:31 +09005888 case SCTP_AUTO_ASCONF:
5889 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
5890 break;
Neil Horman5aa93bc2012-07-21 07:56:07 +00005891 case SCTP_PEER_ADDR_THLDS:
5892 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
5893 break;
Michele Baldessari196d6752012-12-01 04:49:42 +00005894 case SCTP_GET_ASSOC_STATS:
5895 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
5896 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005897 default:
5898 retval = -ENOPROTOOPT;
5899 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07005900 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005901
wangweidong048ed4b2014-01-21 15:44:11 +08005902 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005903 return retval;
5904}
5905
5906static void sctp_hash(struct sock *sk)
5907{
5908 /* STUB */
5909}
5910
5911static void sctp_unhash(struct sock *sk)
5912{
5913 /* STUB */
5914}
5915
5916/* Check if port is acceptable. Possibly find first available port.
5917 *
5918 * The port hash table (contained in the 'global' SCTP protocol storage
5919 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5920 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5921 * list (the list number is the port number hashed out, so as you
5922 * would expect from a hash function, all the ports in a given list have
5923 * such a number that hashes out to the same list number; you were
5924 * expecting that, right?); so each list has a set of ports, with a
5925 * link to the socket (struct sock) that uses it, the port number and
5926 * a fastreuse flag (FIXME: NPI ipg).
5927 */
5928static struct sctp_bind_bucket *sctp_bucket_create(
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005929 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005930
5931static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
5932{
5933 struct sctp_bind_hashbucket *head; /* hash list */
Sasha Levinb67bfe02013-02-27 17:06:00 -08005934 struct sctp_bind_bucket *pp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005935 unsigned short snum;
5936 int ret;
5937
Al Viro04afd8b2006-11-20 17:02:01 -08005938 snum = ntohs(addr->v4.sin_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005939
Daniel Borkmannbb333812013-06-28 19:49:40 +02005940 pr_debug("%s: begins, snum:%d\n", __func__, snum);
5941
wangweidong79b91132014-01-21 15:44:07 +08005942 local_bh_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005943
5944 if (snum == 0) {
Stephen Hemminger06393002007-10-10 17:30:18 -07005945 /* Search for an available port. */
Stephen Hemminger227b60f2007-10-10 17:30:46 -07005946 int low, high, remaining, index;
5947 unsigned int rover;
5948
Eric W. Biederman0bbf87d2013-09-28 14:10:59 -07005949 inet_get_local_port_range(sock_net(sk), &low, &high);
Stephen Hemminger227b60f2007-10-10 17:30:46 -07005950 remaining = (high - low) + 1;
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -05005951 rover = prandom_u32() % remaining + low;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005952
Linus Torvalds1da177e2005-04-16 15:20:36 -07005953 do {
5954 rover++;
5955 if ((rover < low) || (rover > high))
5956 rover = low;
Amerigo Wange3826f12010-05-05 00:27:06 +00005957 if (inet_is_reserved_local_port(rover))
5958 continue;
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005959 index = sctp_phashfn(sock_net(sk), rover);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005960 head = &sctp_port_hashtable[index];
wangweidong3c8e43b2014-01-21 15:44:08 +08005961 spin_lock(&head->lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08005962 sctp_for_each_hentry(pp, &head->chain)
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005963 if ((pp->port == rover) &&
5964 net_eq(sock_net(sk), pp->net))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005965 goto next;
5966 break;
5967 next:
wangweidong3c8e43b2014-01-21 15:44:08 +08005968 spin_unlock(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005969 } while (--remaining > 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005970
5971 /* Exhausted local port range during search? */
5972 ret = 1;
5973 if (remaining <= 0)
5974 goto fail;
5975
5976 /* OK, here is the one we will use. HEAD (the port
5977 * hash table list entry) is non-NULL and we hold it's
5978 * mutex.
5979 */
5980 snum = rover;
5981 } else {
5982 /* We are given an specific port number; we verify
5983 * that it is not being used. If it is used, we will
5984 * exahust the search in the hash list corresponding
5985 * to the port number (snum) - we detect that with the
5986 * port iterator, pp being NULL.
5987 */
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005988 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
wangweidong3c8e43b2014-01-21 15:44:08 +08005989 spin_lock(&head->lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08005990 sctp_for_each_hentry(pp, &head->chain) {
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005991 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005992 goto pp_found;
5993 }
5994 }
5995 pp = NULL;
5996 goto pp_not_found;
5997pp_found:
5998 if (!hlist_empty(&pp->owner)) {
5999 /* We had a port hash table hit - there is an
6000 * available port (pp != NULL) and it is being
6001 * used by other socket (pp->owner not empty); that other
6002 * socket is going to be sk2.
6003 */
6004 int reuse = sk->sk_reuse;
6005 struct sock *sk2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006006
Daniel Borkmannbb333812013-06-28 19:49:40 +02006007 pr_debug("%s: found a possible match\n", __func__);
6008
Vlad Yasevichce5325c2007-05-04 13:34:49 -07006009 if (pp->fastreuse && sk->sk_reuse &&
6010 sk->sk_state != SCTP_SS_LISTENING)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006011 goto success;
6012
6013 /* Run through the list of sockets bound to the port
6014 * (pp->port) [via the pointers bind_next and
6015 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
6016 * we get the endpoint they describe and run through
6017 * the endpoint's list of IP (v4 or v6) addresses,
6018 * comparing each of the addresses with the address of
6019 * the socket sk. If we find a match, then that means
6020 * that this port/socket (sk) combination are already
6021 * in an endpoint.
6022 */
Sasha Levinb67bfe02013-02-27 17:06:00 -08006023 sk_for_each_bound(sk2, &pp->owner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006024 struct sctp_endpoint *ep2;
6025 ep2 = sctp_sk(sk2)->ep;
6026
Vlad Yasevich4e540642008-07-18 23:06:32 -07006027 if (sk == sk2 ||
6028 (reuse && sk2->sk_reuse &&
6029 sk2->sk_state != SCTP_SS_LISTENING))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006030 continue;
6031
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07006032 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
6033 sctp_sk(sk2), sctp_sk(sk))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006034 ret = (long)sk2;
6035 goto fail_unlock;
6036 }
6037 }
Daniel Borkmannbb333812013-06-28 19:49:40 +02006038
6039 pr_debug("%s: found a match\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006040 }
6041pp_not_found:
6042 /* If there was a hash table miss, create a new port. */
6043 ret = 1;
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006044 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006045 goto fail_unlock;
6046
6047 /* In either case (hit or miss), make sure fastreuse is 1 only
6048 * if sk->sk_reuse is too (that is, if the caller requested
6049 * SO_REUSEADDR on this socket -sk-).
6050 */
Vlad Yasevichce5325c2007-05-04 13:34:49 -07006051 if (hlist_empty(&pp->owner)) {
6052 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
6053 pp->fastreuse = 1;
6054 else
6055 pp->fastreuse = 0;
6056 } else if (pp->fastreuse &&
6057 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006058 pp->fastreuse = 0;
6059
6060 /* We are set, so fill up all the data in the hash table
6061 * entry, tie the socket list information with the rest of the
6062 * sockets FIXME: Blurry, NPI (ipg).
6063 */
6064success:
Linus Torvalds1da177e2005-04-16 15:20:36 -07006065 if (!sctp_sk(sk)->bind_hash) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006066 inet_sk(sk)->inet_num = snum;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006067 sk_add_bind_node(sk, &pp->owner);
6068 sctp_sk(sk)->bind_hash = pp;
6069 }
6070 ret = 0;
6071
6072fail_unlock:
wangweidong3c8e43b2014-01-21 15:44:08 +08006073 spin_unlock(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006074
6075fail:
wangweidong79b91132014-01-21 15:44:07 +08006076 local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006077 return ret;
6078}
6079
6080/* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6081 * port is requested.
6082 */
6083static int sctp_get_port(struct sock *sk, unsigned short snum)
6084{
Linus Torvalds1da177e2005-04-16 15:20:36 -07006085 union sctp_addr addr;
6086 struct sctp_af *af = sctp_sk(sk)->pf->af;
6087
6088 /* Set up a dummy address struct from the sk. */
6089 af->from_sk(&addr, sk);
6090 addr.v4.sin_port = htons(snum);
6091
6092 /* Note: sk->sk_num gets filled in if ephemeral port request. */
Daniel Borkmann62208f12013-06-25 18:17:30 +02006093 return !!sctp_get_port_local(sk, &addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006094}
6095
6096/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07006097 * Move a socket to LISTENING state.
6098 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02006099static int sctp_listen_start(struct sock *sk, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006100{
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006101 struct sctp_sock *sp = sctp_sk(sk);
6102 struct sctp_endpoint *ep = sp->ep;
Herbert Xu1b489e12006-08-20 15:07:14 +10006103 struct crypto_hash *tfm = NULL;
Neil Horman3c681982012-10-24 09:20:03 +00006104 char alg[32];
Linus Torvalds1da177e2005-04-16 15:20:36 -07006105
6106 /* Allocate HMAC for generating cookie. */
Neil Horman3c681982012-10-24 09:20:03 +00006107 if (!sp->hmac && sp->sctp_hmac_alg) {
6108 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
6109 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
Vlad Yasevich8dc49842007-05-09 13:50:20 -07006110 if (IS_ERR(tfm)) {
Joe Perchese87cc472012-05-13 21:56:26 +00006111 net_info_ratelimited("failed to load transform for %s: %ld\n",
Neil Horman3c681982012-10-24 09:20:03 +00006112 sp->sctp_hmac_alg, PTR_ERR(tfm));
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006113 return -ENOSYS;
6114 }
6115 sctp_sk(sk)->hmac = tfm;
6116 }
6117
6118 /*
6119 * If a bind() or sctp_bindx() is not called prior to a listen()
6120 * call that allows new associations to be accepted, the system
6121 * picks an ephemeral port and will choose an address set equivalent
6122 * to binding with a wildcard address.
6123 *
6124 * This is not currently spelled out in the SCTP sockets
6125 * extensions draft, but follows the practice as seen in TCP
6126 * sockets.
6127 *
6128 */
6129 sk->sk_state = SCTP_SS_LISTENING;
6130 if (!ep->base.bind_addr.port) {
6131 if (sctp_autobind(sk))
6132 return -EAGAIN;
6133 } else {
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006134 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006135 sk->sk_state = SCTP_SS_CLOSED;
6136 return -EADDRINUSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006137 }
6138 }
6139
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006140 sk->sk_max_ack_backlog = backlog;
6141 sctp_hash_endpoint(ep);
6142 return 0;
6143}
6144
6145/*
6146 * 4.1.3 / 5.1.3 listen()
6147 *
6148 * By default, new associations are not accepted for UDP style sockets.
6149 * An application uses listen() to mark a socket as being able to
6150 * accept new associations.
6151 *
6152 * On TCP style sockets, applications use listen() to ready the SCTP
6153 * endpoint for accepting inbound associations.
6154 *
6155 * On both types of endpoints a backlog of '0' disables listening.
6156 *
6157 * Move a socket to LISTENING state.
6158 */
6159int sctp_inet_listen(struct socket *sock, int backlog)
6160{
6161 struct sock *sk = sock->sk;
6162 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6163 int err = -EINVAL;
6164
6165 if (unlikely(backlog < 0))
6166 return err;
6167
wangweidong048ed4b2014-01-21 15:44:11 +08006168 lock_sock(sk);
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006169
6170 /* Peeled-off sockets are not allowed to listen(). */
6171 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
6172 goto out;
6173
6174 if (sock->state != SS_UNCONNECTED)
6175 goto out;
6176
6177 /* If backlog is zero, disable listening. */
6178 if (!backlog) {
6179 if (sctp_sstate(sk, CLOSED))
6180 goto out;
6181
6182 err = 0;
6183 sctp_unhash_endpoint(ep);
6184 sk->sk_state = SCTP_SS_CLOSED;
6185 if (sk->sk_reuse)
6186 sctp_sk(sk)->bind_hash->fastreuse = 1;
6187 goto out;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07006188 }
6189
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006190 /* If we are already listening, just update the backlog */
6191 if (sctp_sstate(sk, LISTENING))
6192 sk->sk_max_ack_backlog = backlog;
6193 else {
6194 err = sctp_listen_start(sk, backlog);
6195 if (err)
6196 goto out;
6197 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006198
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006199 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006200out:
wangweidong048ed4b2014-01-21 15:44:11 +08006201 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006202 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006203}
6204
6205/*
6206 * This function is done by modeling the current datagram_poll() and the
6207 * tcp_poll(). Note that, based on these implementations, we don't
6208 * lock the socket in this function, even though it seems that,
6209 * ideally, locking or some other mechanisms can be used to ensure
Neil Horman9bffc4a2005-12-19 14:24:40 -08006210 * the integrity of the counters (sndbuf and wmem_alloc) used
Linus Torvalds1da177e2005-04-16 15:20:36 -07006211 * in this place. We assume that we don't need locks either until proven
6212 * otherwise.
6213 *
6214 * Another thing to note is that we include the Async I/O support
6215 * here, again, by modeling the current TCP/UDP code. We don't have
6216 * a good way to test with it yet.
6217 */
6218unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
6219{
6220 struct sock *sk = sock->sk;
6221 struct sctp_sock *sp = sctp_sk(sk);
6222 unsigned int mask;
6223
Eric Dumazetaa395142010-04-20 13:03:51 +00006224 poll_wait(file, sk_sleep(sk), wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006225
6226 /* A TCP-style listening socket becomes readable when the accept queue
6227 * is not empty.
6228 */
6229 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
6230 return (!list_empty(&sp->ep->asocs)) ?
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09006231 (POLLIN | POLLRDNORM) : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006232
6233 mask = 0;
6234
6235 /* Is there any exceptional events? */
6236 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
Keller, Jacob E7d4c04f2013-03-28 11:19:25 +00006237 mask |= POLLERR |
Daniel Borkmanna0fb05d2013-09-07 16:44:59 +02006238 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
Davide Libenzif348d702006-03-25 03:07:39 -08006239 if (sk->sk_shutdown & RCV_SHUTDOWN)
Eric Dumazetdb409802010-09-06 11:13:50 +00006240 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006241 if (sk->sk_shutdown == SHUTDOWN_MASK)
6242 mask |= POLLHUP;
6243
6244 /* Is it readable? Reconsider this code with TCP-style support. */
Eric Dumazetdb409802010-09-06 11:13:50 +00006245 if (!skb_queue_empty(&sk->sk_receive_queue))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006246 mask |= POLLIN | POLLRDNORM;
6247
6248 /* The association is either gone or not ready. */
6249 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
6250 return mask;
6251
6252 /* Is it writable? */
6253 if (sctp_writeable(sk)) {
6254 mask |= POLLOUT | POLLWRNORM;
6255 } else {
6256 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
6257 /*
6258 * Since the socket is not locked, the buffer
6259 * might be made available after the writeable check and
6260 * before the bit is set. This could cause a lost I/O
6261 * signal. tcp_poll() has a race breaker for this race
6262 * condition. Based on their implementation, we put
6263 * in the following code to cover it as well.
6264 */
6265 if (sctp_writeable(sk))
6266 mask |= POLLOUT | POLLWRNORM;
6267 }
6268 return mask;
6269}
6270
6271/********************************************************************
6272 * 2nd Level Abstractions
6273 ********************************************************************/
6274
6275static struct sctp_bind_bucket *sctp_bucket_create(
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006276 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006277{
6278 struct sctp_bind_bucket *pp;
6279
Christoph Lameter54e6ecb2006-12-06 20:33:16 -08006280 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006281 if (pp) {
Li Zefan935a7f62008-04-10 01:58:06 -07006282 SCTP_DBG_OBJCNT_INC(bind_bucket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006283 pp->port = snum;
6284 pp->fastreuse = 0;
6285 INIT_HLIST_HEAD(&pp->owner);
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006286 pp->net = net;
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05006287 hlist_add_head(&pp->node, &head->chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006288 }
6289 return pp;
6290}
6291
6292/* Caller must hold hashbucket lock for this tb with local BH disabled */
6293static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6294{
Sridhar Samudrala37fa6872006-07-21 14:45:47 -07006295 if (pp && hlist_empty(&pp->owner)) {
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05006296 __hlist_del(&pp->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006297 kmem_cache_free(sctp_bucket_cachep, pp);
6298 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6299 }
6300}
6301
6302/* Release this socket's reference to a local port. */
6303static inline void __sctp_put_port(struct sock *sk)
6304{
6305 struct sctp_bind_hashbucket *head =
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006306 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
6307 inet_sk(sk)->inet_num)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07006308 struct sctp_bind_bucket *pp;
6309
wangweidong3c8e43b2014-01-21 15:44:08 +08006310 spin_lock(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006311 pp = sctp_sk(sk)->bind_hash;
6312 __sk_del_bind_node(sk);
6313 sctp_sk(sk)->bind_hash = NULL;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006314 inet_sk(sk)->inet_num = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006315 sctp_bucket_destroy(pp);
wangweidong3c8e43b2014-01-21 15:44:08 +08006316 spin_unlock(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006317}
6318
6319void sctp_put_port(struct sock *sk)
6320{
wangweidong79b91132014-01-21 15:44:07 +08006321 local_bh_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006322 __sctp_put_port(sk);
wangweidong79b91132014-01-21 15:44:07 +08006323 local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006324}
6325
6326/*
6327 * The system picks an ephemeral port and choose an address set equivalent
6328 * to binding with a wildcard address.
6329 * One of those addresses will be the primary address for the association.
6330 * This automatically enables the multihoming capability of SCTP.
6331 */
6332static int sctp_autobind(struct sock *sk)
6333{
6334 union sctp_addr autoaddr;
6335 struct sctp_af *af;
Al Viro6fbfa9f2006-11-20 17:24:53 -08006336 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006337
6338 /* Initialize a local sockaddr structure to INADDR_ANY. */
6339 af = sctp_sk(sk)->pf->af;
6340
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006341 port = htons(inet_sk(sk)->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006342 af->inaddr_any(&autoaddr, port);
6343
6344 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6345}
6346
6347/* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6348 *
6349 * From RFC 2292
6350 * 4.2 The cmsghdr Structure *
6351 *
6352 * When ancillary data is sent or received, any number of ancillary data
6353 * objects can be specified by the msg_control and msg_controllen members of
6354 * the msghdr structure, because each object is preceded by
6355 * a cmsghdr structure defining the object's length (the cmsg_len member).
6356 * Historically Berkeley-derived implementations have passed only one object
6357 * at a time, but this API allows multiple objects to be
6358 * passed in a single call to sendmsg() or recvmsg(). The following example
6359 * shows two ancillary data objects in a control buffer.
6360 *
6361 * |<--------------------------- msg_controllen -------------------------->|
6362 * | |
6363 *
6364 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6365 *
6366 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6367 * | | |
6368 *
6369 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6370 *
6371 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6372 * | | | | |
6373 *
6374 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6375 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6376 *
6377 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6378 *
6379 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6380 * ^
6381 * |
6382 *
6383 * msg_control
6384 * points here
6385 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02006386static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006387{
6388 struct cmsghdr *cmsg;
Vlad Yasevichab38fb02008-04-12 18:40:06 -07006389 struct msghdr *my_msg = (struct msghdr *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006390
6391 for (cmsg = CMSG_FIRSTHDR(msg);
6392 cmsg != NULL;
Vlad Yasevichab38fb02008-04-12 18:40:06 -07006393 cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
6394 if (!CMSG_OK(my_msg, cmsg))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006395 return -EINVAL;
6396
6397 /* Should we parse this header or ignore? */
6398 if (cmsg->cmsg_level != IPPROTO_SCTP)
6399 continue;
6400
6401 /* Strictly check lengths following example in SCM code. */
6402 switch (cmsg->cmsg_type) {
6403 case SCTP_INIT:
6404 /* SCTP Socket API Extension
6405 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
6406 *
6407 * This cmsghdr structure provides information for
6408 * initializing new SCTP associations with sendmsg().
6409 * The SCTP_INITMSG socket option uses this same data
6410 * structure. This structure is not used for
6411 * recvmsg().
6412 *
6413 * cmsg_level cmsg_type cmsg_data[]
6414 * ------------ ------------ ----------------------
6415 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6416 */
6417 if (cmsg->cmsg_len !=
6418 CMSG_LEN(sizeof(struct sctp_initmsg)))
6419 return -EINVAL;
6420 cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
6421 break;
6422
6423 case SCTP_SNDRCV:
6424 /* SCTP Socket API Extension
6425 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6426 *
6427 * This cmsghdr structure specifies SCTP options for
6428 * sendmsg() and describes SCTP header information
6429 * about a received message through recvmsg().
6430 *
6431 * cmsg_level cmsg_type cmsg_data[]
6432 * ------------ ------------ ----------------------
6433 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6434 */
6435 if (cmsg->cmsg_len !=
6436 CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6437 return -EINVAL;
6438
6439 cmsgs->info =
6440 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
6441
6442 /* Minimally, validate the sinfo_flags. */
6443 if (cmsgs->info->sinfo_flags &
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07006444 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6445 SCTP_ABORT | SCTP_EOF))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006446 return -EINVAL;
6447 break;
6448
6449 default:
6450 return -EINVAL;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07006451 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006452 }
6453 return 0;
6454}
6455
6456/*
6457 * Wait for a packet..
6458 * Note: This function is the same function as in core/datagram.c
6459 * with a few modifications to make lksctp work.
6460 */
wangweidong26ac8e52013-12-23 12:16:51 +08006461static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006462{
6463 int error;
6464 DEFINE_WAIT(wait);
6465
Eric Dumazetaa395142010-04-20 13:03:51 +00006466 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006467
6468 /* Socket errors? */
6469 error = sock_error(sk);
6470 if (error)
6471 goto out;
6472
6473 if (!skb_queue_empty(&sk->sk_receive_queue))
6474 goto ready;
6475
6476 /* Socket shut down? */
6477 if (sk->sk_shutdown & RCV_SHUTDOWN)
6478 goto out;
6479
6480 /* Sequenced packets can come disconnected. If so we report the
6481 * problem.
6482 */
6483 error = -ENOTCONN;
6484
6485 /* Is there a good reason to think that we may receive some data? */
6486 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6487 goto out;
6488
6489 /* Handle signals. */
6490 if (signal_pending(current))
6491 goto interrupted;
6492
6493 /* Let another process have a go. Since we are going to sleep
6494 * anyway. Note: This may cause odd behaviors if the message
6495 * does not fit in the user's buffer, but this seems to be the
6496 * only way to honor MSG_DONTWAIT realistically.
6497 */
wangweidong048ed4b2014-01-21 15:44:11 +08006498 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006499 *timeo_p = schedule_timeout(*timeo_p);
wangweidong048ed4b2014-01-21 15:44:11 +08006500 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006501
6502ready:
Eric Dumazetaa395142010-04-20 13:03:51 +00006503 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006504 return 0;
6505
6506interrupted:
6507 error = sock_intr_errno(*timeo_p);
6508
6509out:
Eric Dumazetaa395142010-04-20 13:03:51 +00006510 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006511 *err = error;
6512 return error;
6513}
6514
6515/* Receive a datagram.
6516 * Note: This is pretty much the same routine as in core/datagram.c
6517 * with a few changes to make lksctp work.
6518 */
6519static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6520 int noblock, int *err)
6521{
6522 int error;
6523 struct sk_buff *skb;
6524 long timeo;
6525
Linus Torvalds1da177e2005-04-16 15:20:36 -07006526 timeo = sock_rcvtimeo(sk, noblock);
6527
Daniel Borkmannbb333812013-06-28 19:49:40 +02006528 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
6529 MAX_SCHEDULE_TIMEOUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006530
6531 do {
6532 /* Again only user level code calls this function,
6533 * so nothing interrupt level
6534 * will suddenly eat the receive_queue.
6535 *
6536 * Look at current nfs client by the way...
David Shwatrz8917a3c2010-12-02 09:01:55 +00006537 * However, this function was correct in any case. 8)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006538 */
6539 if (flags & MSG_PEEK) {
Herbert Xu1e061ab2005-06-18 22:56:42 -07006540 spin_lock_bh(&sk->sk_receive_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006541 skb = skb_peek(&sk->sk_receive_queue);
6542 if (skb)
6543 atomic_inc(&skb->users);
Herbert Xu1e061ab2005-06-18 22:56:42 -07006544 spin_unlock_bh(&sk->sk_receive_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006545 } else {
6546 skb = skb_dequeue(&sk->sk_receive_queue);
6547 }
6548
6549 if (skb)
6550 return skb;
6551
Neil Horman6736dc32005-12-02 20:30:06 -08006552 /* Caller is allowed not to check sk->sk_err before calling. */
6553 error = sock_error(sk);
6554 if (error)
6555 goto no_packet;
6556
Linus Torvalds1da177e2005-04-16 15:20:36 -07006557 if (sk->sk_shutdown & RCV_SHUTDOWN)
6558 break;
6559
6560 /* User doesn't want to wait. */
6561 error = -EAGAIN;
6562 if (!timeo)
6563 goto no_packet;
6564 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6565
6566 return NULL;
6567
6568no_packet:
6569 *err = error;
6570 return NULL;
6571}
6572
6573/* If sndbuf has changed, wake up per association sndbuf waiters. */
6574static void __sctp_write_space(struct sctp_association *asoc)
6575{
6576 struct sock *sk = asoc->base.sk;
6577 struct socket *sock = sk->sk_socket;
6578
6579 if ((sctp_wspace(asoc) > 0) && sock) {
6580 if (waitqueue_active(&asoc->wait))
6581 wake_up_interruptible(&asoc->wait);
6582
6583 if (sctp_writeable(sk)) {
Eric Dumazeteaefd112011-02-18 03:26:36 +00006584 wait_queue_head_t *wq = sk_sleep(sk);
6585
6586 if (wq && waitqueue_active(wq))
6587 wake_up_interruptible(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006588
6589 /* Note that we try to include the Async I/O support
6590 * here by modeling from the current TCP/UDP code.
6591 * We have not tested with it yet.
6592 */
Eric Dumazeteaefd112011-02-18 03:26:36 +00006593 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08006594 sock_wake_async(sock,
6595 SOCK_WAKE_SPACE, POLL_OUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006596 }
6597 }
6598}
6599
Daniel Borkmann52c35be2014-04-08 17:26:13 +02006600static void sctp_wake_up_waiters(struct sock *sk,
6601 struct sctp_association *asoc)
6602{
6603 struct sctp_association *tmp = asoc;
6604
6605 /* We do accounting for the sndbuf space per association,
6606 * so we only need to wake our own association.
6607 */
6608 if (asoc->ep->sndbuf_policy)
6609 return __sctp_write_space(asoc);
6610
Daniel Borkmann1e1cdf82014-04-09 16:10:20 +02006611 /* If association goes down and is just flushing its
6612 * outq, then just normally notify others.
6613 */
6614 if (asoc->base.dead)
6615 return sctp_write_space(sk);
6616
Daniel Borkmann52c35be2014-04-08 17:26:13 +02006617 /* Accounting for the sndbuf space is per socket, so we
6618 * need to wake up others, try to be fair and in case of
6619 * other associations, let them have a go first instead
6620 * of just doing a sctp_write_space() call.
6621 *
6622 * Note that we reach sctp_wake_up_waiters() only when
6623 * associations free up queued chunks, thus we are under
6624 * lock and the list of associations on a socket is
6625 * guaranteed not to change.
6626 */
6627 for (tmp = list_next_entry(tmp, asocs); 1;
6628 tmp = list_next_entry(tmp, asocs)) {
6629 /* Manually skip the head element. */
6630 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
6631 continue;
6632 /* Wake up association. */
6633 __sctp_write_space(tmp);
6634 /* We've reached the end. */
6635 if (tmp == asoc)
6636 break;
6637 }
6638}
6639
Linus Torvalds1da177e2005-04-16 15:20:36 -07006640/* Do accounting for the sndbuf space.
6641 * Decrement the used sndbuf space of the corresponding association by the
6642 * data size which was just transmitted(freed).
6643 */
6644static void sctp_wfree(struct sk_buff *skb)
6645{
6646 struct sctp_association *asoc;
6647 struct sctp_chunk *chunk;
6648 struct sock *sk;
6649
6650 /* Get the saved chunk pointer. */
6651 chunk = *((struct sctp_chunk **)(skb->cb));
6652 asoc = chunk->asoc;
6653 sk = asoc->base.sk;
Neil Horman4eb701d2005-04-28 12:02:04 -07006654 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6655 sizeof(struct sk_buff) +
6656 sizeof(struct sctp_chunk);
6657
Neil Horman4eb701d2005-04-28 12:02:04 -07006658 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6659
Neil Horman4d93df02007-08-15 16:07:44 -07006660 /*
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006661 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
Neil Horman4d93df02007-08-15 16:07:44 -07006662 */
6663 sk->sk_wmem_queued -= skb->truesize;
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006664 sk_mem_uncharge(sk, skb->truesize);
Neil Horman4d93df02007-08-15 16:07:44 -07006665
Neil Horman4eb701d2005-04-28 12:02:04 -07006666 sock_wfree(skb);
Daniel Borkmann52c35be2014-04-08 17:26:13 +02006667 sctp_wake_up_waiters(sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006668
6669 sctp_association_put(asoc);
6670}
6671
Vlad Yasevich331c4ee2006-10-09 21:34:04 -07006672/* Do accounting for the receive space on the socket.
6673 * Accounting for the association is done in ulpevent.c
6674 * We set this as a destructor for the cloned data skbs so that
6675 * accounting is done at the correct time.
6676 */
6677void sctp_sock_rfree(struct sk_buff *skb)
6678{
6679 struct sock *sk = skb->sk;
6680 struct sctp_ulpevent *event = sctp_skb2event(skb);
6681
6682 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
Neil Horman4d93df02007-08-15 16:07:44 -07006683
6684 /*
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006685 * Mimic the behavior of sock_rfree
Neil Horman4d93df02007-08-15 16:07:44 -07006686 */
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006687 sk_mem_uncharge(sk, event->rmem_len);
Vlad Yasevich331c4ee2006-10-09 21:34:04 -07006688}
6689
6690
Linus Torvalds1da177e2005-04-16 15:20:36 -07006691/* Helper function to wait for space in the sndbuf. */
6692static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6693 size_t msg_len)
6694{
6695 struct sock *sk = asoc->base.sk;
6696 int err = 0;
6697 long current_timeo = *timeo_p;
6698 DEFINE_WAIT(wait);
6699
Daniel Borkmannbb333812013-06-28 19:49:40 +02006700 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
6701 *timeo_p, msg_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006702
6703 /* Increment the association's refcnt. */
6704 sctp_association_hold(asoc);
6705
6706 /* Wait on the association specific sndbuf space. */
6707 for (;;) {
6708 prepare_to_wait_exclusive(&asoc->wait, &wait,
6709 TASK_INTERRUPTIBLE);
6710 if (!*timeo_p)
6711 goto do_nonblock;
6712 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6713 asoc->base.dead)
6714 goto do_error;
6715 if (signal_pending(current))
6716 goto do_interrupted;
6717 if (msg_len <= sctp_wspace(asoc))
6718 break;
6719
6720 /* Let another process have a go. Since we are going
6721 * to sleep anyway.
6722 */
wangweidong048ed4b2014-01-21 15:44:11 +08006723 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006724 current_timeo = schedule_timeout(current_timeo);
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07006725 BUG_ON(sk != asoc->base.sk);
wangweidong048ed4b2014-01-21 15:44:11 +08006726 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006727
6728 *timeo_p = current_timeo;
6729 }
6730
6731out:
6732 finish_wait(&asoc->wait, &wait);
6733
6734 /* Release the association's refcnt. */
6735 sctp_association_put(asoc);
6736
6737 return err;
6738
6739do_error:
6740 err = -EPIPE;
6741 goto out;
6742
6743do_interrupted:
6744 err = sock_intr_errno(*timeo_p);
6745 goto out;
6746
6747do_nonblock:
6748 err = -EAGAIN;
6749 goto out;
6750}
6751
David S. Miller676d2362014-04-11 16:15:36 -04006752void sctp_data_ready(struct sock *sk)
Wei Yongjun561b1732010-04-28 08:47:18 +00006753{
David S. Miller7ef52732010-05-02 21:43:40 -07006754 struct socket_wq *wq;
6755
6756 rcu_read_lock();
6757 wq = rcu_dereference(sk->sk_wq);
6758 if (wq_has_sleeper(wq))
6759 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
Wei Yongjun561b1732010-04-28 08:47:18 +00006760 POLLRDNORM | POLLRDBAND);
6761 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
David S. Miller7ef52732010-05-02 21:43:40 -07006762 rcu_read_unlock();
Wei Yongjun561b1732010-04-28 08:47:18 +00006763}
6764
Linus Torvalds1da177e2005-04-16 15:20:36 -07006765/* If socket sndbuf has changed, wake up all per association waiters. */
6766void sctp_write_space(struct sock *sk)
6767{
6768 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006769
6770 /* Wake up the tasks in each wait queue. */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07006771 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006772 __sctp_write_space(asoc);
6773 }
6774}
6775
6776/* Is there any sndbuf space available on the socket?
6777 *
Neil Horman9bffc4a2005-12-19 14:24:40 -08006778 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07006779 * associations on the same socket. For a UDP-style socket with
6780 * multiple associations, it is possible for it to be "unwriteable"
6781 * prematurely. I assume that this is acceptable because
6782 * a premature "unwriteable" is better than an accidental "writeable" which
6783 * would cause an unwanted block under certain circumstances. For the 1-1
6784 * UDP-style sockets or TCP-style sockets, this code should work.
6785 * - Daisy
6786 */
6787static int sctp_writeable(struct sock *sk)
6788{
6789 int amt = 0;
6790
Eric Dumazet31e6d362009-06-17 19:05:41 -07006791 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006792 if (amt < 0)
6793 amt = 0;
6794 return amt;
6795}
6796
6797/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6798 * returns immediately with EINPROGRESS.
6799 */
6800static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
6801{
6802 struct sock *sk = asoc->base.sk;
6803 int err = 0;
6804 long current_timeo = *timeo_p;
6805 DEFINE_WAIT(wait);
6806
Daniel Borkmannbb333812013-06-28 19:49:40 +02006807 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006808
6809 /* Increment the association's refcnt. */
6810 sctp_association_hold(asoc);
6811
6812 for (;;) {
6813 prepare_to_wait_exclusive(&asoc->wait, &wait,
6814 TASK_INTERRUPTIBLE);
6815 if (!*timeo_p)
6816 goto do_nonblock;
6817 if (sk->sk_shutdown & RCV_SHUTDOWN)
6818 break;
6819 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6820 asoc->base.dead)
6821 goto do_error;
6822 if (signal_pending(current))
6823 goto do_interrupted;
6824
6825 if (sctp_state(asoc, ESTABLISHED))
6826 break;
6827
6828 /* Let another process have a go. Since we are going
6829 * to sleep anyway.
6830 */
wangweidong048ed4b2014-01-21 15:44:11 +08006831 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006832 current_timeo = schedule_timeout(current_timeo);
wangweidong048ed4b2014-01-21 15:44:11 +08006833 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006834
6835 *timeo_p = current_timeo;
6836 }
6837
6838out:
6839 finish_wait(&asoc->wait, &wait);
6840
6841 /* Release the association's refcnt. */
6842 sctp_association_put(asoc);
6843
6844 return err;
6845
6846do_error:
Vlad Yasevich81845c22006-01-30 15:59:54 -08006847 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006848 err = -ETIMEDOUT;
6849 else
6850 err = -ECONNREFUSED;
6851 goto out;
6852
6853do_interrupted:
6854 err = sock_intr_errno(*timeo_p);
6855 goto out;
6856
6857do_nonblock:
6858 err = -EINPROGRESS;
6859 goto out;
6860}
6861
6862static int sctp_wait_for_accept(struct sock *sk, long timeo)
6863{
6864 struct sctp_endpoint *ep;
6865 int err = 0;
6866 DEFINE_WAIT(wait);
6867
6868 ep = sctp_sk(sk)->ep;
6869
6870
6871 for (;;) {
Eric Dumazetaa395142010-04-20 13:03:51 +00006872 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
Linus Torvalds1da177e2005-04-16 15:20:36 -07006873 TASK_INTERRUPTIBLE);
6874
6875 if (list_empty(&ep->asocs)) {
wangweidong048ed4b2014-01-21 15:44:11 +08006876 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006877 timeo = schedule_timeout(timeo);
wangweidong048ed4b2014-01-21 15:44:11 +08006878 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006879 }
6880
6881 err = -EINVAL;
6882 if (!sctp_sstate(sk, LISTENING))
6883 break;
6884
6885 err = 0;
6886 if (!list_empty(&ep->asocs))
6887 break;
6888
6889 err = sock_intr_errno(timeo);
6890 if (signal_pending(current))
6891 break;
6892
6893 err = -EAGAIN;
6894 if (!timeo)
6895 break;
6896 }
6897
Eric Dumazetaa395142010-04-20 13:03:51 +00006898 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006899
6900 return err;
6901}
6902
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +02006903static void sctp_wait_for_close(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006904{
6905 DEFINE_WAIT(wait);
6906
6907 do {
Eric Dumazetaa395142010-04-20 13:03:51 +00006908 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006909 if (list_empty(&sctp_sk(sk)->ep->asocs))
6910 break;
wangweidong048ed4b2014-01-21 15:44:11 +08006911 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006912 timeout = schedule_timeout(timeout);
wangweidong048ed4b2014-01-21 15:44:11 +08006913 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006914 } while (!signal_pending(current) && timeout);
6915
Eric Dumazetaa395142010-04-20 13:03:51 +00006916 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006917}
6918
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006919static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
6920{
6921 struct sk_buff *frag;
6922
6923 if (!skb->data_len)
6924 goto done;
6925
6926 /* Don't forget the fragments. */
David S. Miller1b003be2009-06-09 00:22:35 -07006927 skb_walk_frags(skb, frag)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006928 sctp_skb_set_owner_r_frag(frag, sk);
6929
6930done:
6931 sctp_skb_set_owner_r(skb, sk);
6932}
6933
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006934void sctp_copy_sock(struct sock *newsk, struct sock *sk,
6935 struct sctp_association *asoc)
6936{
6937 struct inet_sock *inet = inet_sk(sk);
Julia Lawall09cb47a2010-01-21 02:43:20 -08006938 struct inet_sock *newinet;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006939
6940 newsk->sk_type = sk->sk_type;
6941 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
6942 newsk->sk_flags = sk->sk_flags;
6943 newsk->sk_no_check = sk->sk_no_check;
6944 newsk->sk_reuse = sk->sk_reuse;
6945
6946 newsk->sk_shutdown = sk->sk_shutdown;
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +02006947 newsk->sk_destruct = sctp_destruct_sock;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006948 newsk->sk_family = sk->sk_family;
6949 newsk->sk_protocol = IPPROTO_SCTP;
6950 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
6951 newsk->sk_sndbuf = sk->sk_sndbuf;
6952 newsk->sk_rcvbuf = sk->sk_rcvbuf;
6953 newsk->sk_lingertime = sk->sk_lingertime;
6954 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
6955 newsk->sk_sndtimeo = sk->sk_sndtimeo;
6956
6957 newinet = inet_sk(newsk);
6958
6959 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6960 * getsockname() and getpeername()
6961 */
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006962 newinet->inet_sport = inet->inet_sport;
6963 newinet->inet_saddr = inet->inet_saddr;
6964 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
6965 newinet->inet_dport = htons(asoc->peer.port);
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006966 newinet->pmtudisc = inet->pmtudisc;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006967 newinet->inet_id = asoc->next_tsn ^ jiffies;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006968
6969 newinet->uc_ttl = inet->uc_ttl;
6970 newinet->mc_loop = 1;
6971 newinet->mc_ttl = 1;
6972 newinet->mc_index = 0;
6973 newinet->mc_list = NULL;
6974}
6975
Linus Torvalds1da177e2005-04-16 15:20:36 -07006976/* Populate the fields of the newsk from the oldsk and migrate the assoc
6977 * and its messages to the newsk.
6978 */
6979static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
6980 struct sctp_association *assoc,
6981 sctp_socket_type_t type)
6982{
6983 struct sctp_sock *oldsp = sctp_sk(oldsk);
6984 struct sctp_sock *newsp = sctp_sk(newsk);
6985 struct sctp_bind_bucket *pp; /* hash list port iterator */
6986 struct sctp_endpoint *newep = newsp->ep;
6987 struct sk_buff *skb, *tmp;
6988 struct sctp_ulpevent *event;
Vlad Yasevichf26f7c42007-12-06 22:50:27 -08006989 struct sctp_bind_hashbucket *head;
Michio Honda9f7d6532011-04-26 19:32:51 +09006990 struct list_head tmplist;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006991
6992 /* Migrate socket buffer sizes and all the socket level options to the
6993 * new socket.
6994 */
6995 newsk->sk_sndbuf = oldsk->sk_sndbuf;
6996 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
6997 /* Brute force copy old sctp opt. */
Michio Honda9f7d6532011-04-26 19:32:51 +09006998 if (oldsp->do_auto_asconf) {
6999 memcpy(&tmplist, &newsp->auto_asconf_list, sizeof(tmplist));
7000 inet_sk_copy_descendant(newsk, oldsk);
7001 memcpy(&newsp->auto_asconf_list, &tmplist, sizeof(tmplist));
7002 } else
7003 inet_sk_copy_descendant(newsk, oldsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007004
7005 /* Restore the ep value that was overwritten with the above structure
7006 * copy.
7007 */
7008 newsp->ep = newep;
7009 newsp->hmac = NULL;
7010
7011 /* Hook this new socket in to the bind_hash list. */
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00007012 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
7013 inet_sk(oldsk)->inet_num)];
wangweidong79b91132014-01-21 15:44:07 +08007014 local_bh_disable();
wangweidong3c8e43b2014-01-21 15:44:08 +08007015 spin_lock(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007016 pp = sctp_sk(oldsk)->bind_hash;
7017 sk_add_bind_node(newsk, &pp->owner);
7018 sctp_sk(newsk)->bind_hash = pp;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00007019 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
wangweidong3c8e43b2014-01-21 15:44:08 +08007020 spin_unlock(&head->lock);
wangweidong79b91132014-01-21 15:44:07 +08007021 local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07007022
Vladislav Yasevich4243cac2005-06-13 15:10:49 -07007023 /* Copy the bind_addr list from the original endpoint to the new
7024 * endpoint so that we can handle restarts properly
7025 */
Vlad Yasevich8e71a112007-12-06 22:50:54 -08007026 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
7027 &oldsp->ep->base.bind_addr, GFP_KERNEL);
Vladislav Yasevich4243cac2005-06-13 15:10:49 -07007028
Linus Torvalds1da177e2005-04-16 15:20:36 -07007029 /* Move any messages in the old socket's receive queue that are for the
7030 * peeled off association to the new socket's receive queue.
7031 */
7032 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
7033 event = sctp_skb2event(skb);
7034 if (event->asoc == assoc) {
David S. Miller8728b832005-08-09 19:25:21 -07007035 __skb_unlink(skb, &oldsk->sk_receive_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007036 __skb_queue_tail(&newsk->sk_receive_queue, skb);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007037 sctp_skb_set_owner_r_frag(skb, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007038 }
7039 }
7040
7041 /* Clean up any messages pending delivery due to partial
7042 * delivery. Three cases:
7043 * 1) No partial deliver; no work.
7044 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
7045 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
7046 */
7047 skb_queue_head_init(&newsp->pd_lobby);
Vlad Yasevichb6e13312007-04-20 12:23:15 -07007048 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007049
Vlad Yasevichb6e13312007-04-20 12:23:15 -07007050 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07007051 struct sk_buff_head *queue;
7052
7053 /* Decide which queue to move pd_lobby skbs to. */
7054 if (assoc->ulpq.pd_mode) {
7055 queue = &newsp->pd_lobby;
7056 } else
7057 queue = &newsk->sk_receive_queue;
7058
7059 /* Walk through the pd_lobby, looking for skbs that
7060 * need moved to the new socket.
7061 */
7062 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
7063 event = sctp_skb2event(skb);
7064 if (event->asoc == assoc) {
David S. Miller8728b832005-08-09 19:25:21 -07007065 __skb_unlink(skb, &oldsp->pd_lobby);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007066 __skb_queue_tail(queue, skb);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007067 sctp_skb_set_owner_r_frag(skb, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007068 }
7069 }
7070
7071 /* Clear up any skbs waiting for the partial
7072 * delivery to finish.
7073 */
7074 if (assoc->ulpq.pd_mode)
Vlad Yasevichb6e13312007-04-20 12:23:15 -07007075 sctp_clear_pd(oldsk, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007076
7077 }
7078
Wei Yongjun1bc4ee42009-07-05 19:45:48 +00007079 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007080 sctp_skb_set_owner_r_frag(skb, newsk);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007081
Wei Yongjun1bc4ee42009-07-05 19:45:48 +00007082 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007083 sctp_skb_set_owner_r_frag(skb, newsk);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007084
Linus Torvalds1da177e2005-04-16 15:20:36 -07007085 /* Set the type of socket to indicate that it is peeled off from the
7086 * original UDP-style socket or created with the accept() call on a
7087 * TCP-style socket..
7088 */
7089 newsp->type = type;
7090
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07007091 /* Mark the new socket "in-use" by the user so that any packets
7092 * that may arrive on the association after we've moved it are
7093 * queued to the backlog. This prevents a potential race between
7094 * backlog processing on the old socket and new-packet processing
7095 * on the new socket.
Zach Brown5131a182007-06-22 15:14:46 -07007096 *
7097 * The caller has just allocated newsk so we can guarantee that other
7098 * paths won't try to lock it and then oldsk.
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07007099 */
Zach Brown5131a182007-06-22 15:14:46 -07007100 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007101 sctp_assoc_migrate(assoc, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007102
7103 /* If the association on the newsk is already closed before accept()
7104 * is called, set RCV_SHUTDOWN flag.
7105 */
7106 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
7107 newsk->sk_shutdown |= RCV_SHUTDOWN;
7108
7109 newsk->sk_state = SCTP_SS_ESTABLISHED;
wangweidong048ed4b2014-01-21 15:44:11 +08007110 release_sock(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007111}
7112
Neil Horman4d93df02007-08-15 16:07:44 -07007113
Linus Torvalds1da177e2005-04-16 15:20:36 -07007114/* This proto struct describes the ULP interface for SCTP. */
7115struct proto sctp_prot = {
7116 .name = "SCTP",
7117 .owner = THIS_MODULE,
7118 .close = sctp_close,
7119 .connect = sctp_connect,
7120 .disconnect = sctp_disconnect,
7121 .accept = sctp_accept,
7122 .ioctl = sctp_ioctl,
7123 .init = sctp_init_sock,
7124 .destroy = sctp_destroy_sock,
7125 .shutdown = sctp_shutdown,
7126 .setsockopt = sctp_setsockopt,
7127 .getsockopt = sctp_getsockopt,
7128 .sendmsg = sctp_sendmsg,
7129 .recvmsg = sctp_recvmsg,
7130 .bind = sctp_bind,
7131 .backlog_rcv = sctp_backlog_rcv,
7132 .hash = sctp_hash,
7133 .unhash = sctp_unhash,
7134 .get_port = sctp_get_port,
7135 .obj_size = sizeof(struct sctp_sock),
Neil Horman4d93df02007-08-15 16:07:44 -07007136 .sysctl_mem = sysctl_sctp_mem,
7137 .sysctl_rmem = sysctl_sctp_rmem,
7138 .sysctl_wmem = sysctl_sctp_wmem,
7139 .memory_pressure = &sctp_memory_pressure,
7140 .enter_memory_pressure = sctp_enter_memory_pressure,
7141 .memory_allocated = &sctp_memory_allocated,
Pavel Emelyanov5f318862008-02-20 00:23:01 -08007142 .sockets_allocated = &sctp_sockets_allocated,
Linus Torvalds1da177e2005-04-16 15:20:36 -07007143};
7144
Eric Dumazetdfd56b82011-12-10 09:48:31 +00007145#if IS_ENABLED(CONFIG_IPV6)
Eric Dumazet8295b6d2007-11-05 23:40:28 -08007146
Linus Torvalds1da177e2005-04-16 15:20:36 -07007147struct proto sctpv6_prot = {
7148 .name = "SCTPv6",
7149 .owner = THIS_MODULE,
7150 .close = sctp_close,
7151 .connect = sctp_connect,
7152 .disconnect = sctp_disconnect,
7153 .accept = sctp_accept,
7154 .ioctl = sctp_ioctl,
7155 .init = sctp_init_sock,
7156 .destroy = sctp_destroy_sock,
7157 .shutdown = sctp_shutdown,
7158 .setsockopt = sctp_setsockopt,
7159 .getsockopt = sctp_getsockopt,
7160 .sendmsg = sctp_sendmsg,
7161 .recvmsg = sctp_recvmsg,
7162 .bind = sctp_bind,
7163 .backlog_rcv = sctp_backlog_rcv,
7164 .hash = sctp_hash,
7165 .unhash = sctp_unhash,
7166 .get_port = sctp_get_port,
7167 .obj_size = sizeof(struct sctp6_sock),
Neil Horman4d93df02007-08-15 16:07:44 -07007168 .sysctl_mem = sysctl_sctp_mem,
7169 .sysctl_rmem = sysctl_sctp_rmem,
7170 .sysctl_wmem = sysctl_sctp_wmem,
7171 .memory_pressure = &sctp_memory_pressure,
7172 .enter_memory_pressure = sctp_enter_memory_pressure,
7173 .memory_allocated = &sctp_memory_allocated,
Pavel Emelyanov5f318862008-02-20 00:23:01 -08007174 .sockets_allocated = &sctp_sockets_allocated,
Linus Torvalds1da177e2005-04-16 15:20:36 -07007175};
Eric Dumazetdfd56b82011-12-10 09:48:31 +00007176#endif /* IS_ENABLED(CONFIG_IPV6) */