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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
Herbert Xu5821c762016-01-24 21:20:12 +080055#include <crypto/hash.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <linux/types.h>
57#include <linux/kernel.h>
58#include <linux/wait.h>
59#include <linux/time.h>
60#include <linux/ip.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080061#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/fcntl.h>
63#include <linux/poll.h>
64#include <linux/init.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>
Neil Horman8465a5f2014-04-17 15:26:51 -040074#include <net/busy_poll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76#include <linux/socket.h> /* for sa_family_t */
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040077#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070078#include <net/sock.h>
79#include <net/sctp/sctp.h>
80#include <net/sctp/sm.h>
81
Linus Torvalds1da177e2005-04-16 15:20:36 -070082/* Forward declarations for internal helper functions. */
83static int sctp_writeable(struct sock *sk);
84static void sctp_wfree(struct sk_buff *skb);
85static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
86 size_t msg_len);
wangweidong26ac8e52013-12-23 12:16:51 +080087static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
89static int sctp_wait_for_accept(struct sock *sk, long timeo);
90static void sctp_wait_for_close(struct sock *sk, long timeo);
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +020091static void sctp_destruct_sock(struct sock *sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
93 union sctp_addr *addr, int len);
94static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
95static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
96static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
97static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
98static int sctp_send_asconf(struct sctp_association *asoc,
99 struct sctp_chunk *chunk);
100static int sctp_do_bind(struct sock *, union sctp_addr *, int);
101static int sctp_autobind(struct sock *sk);
102static void sctp_sock_migrate(struct sock *, struct sock *,
103 struct sctp_association *, sctp_socket_type_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
Adrian Bunkb6fa1a42007-09-12 15:18:00 +0200105static int sctp_memory_pressure;
Eric Dumazet8d987e52010-11-09 23:24:26 +0000106static atomic_long_t sctp_memory_allocated;
Eric Dumazet17483762008-11-25 21:16:35 -0800107struct percpu_counter sctp_sockets_allocated;
Neil Horman4d93df02007-08-15 16:07:44 -0700108
Pavel Emelyanov5c52ba12008-07-16 20:28:10 -0700109static void sctp_enter_memory_pressure(struct sock *sk)
Neil Horman4d93df02007-08-15 16:07:44 -0700110{
111 sctp_memory_pressure = 1;
112}
113
114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115/* Get the sndbuf space available at the time on the association. */
116static inline int sctp_wspace(struct sctp_association *asoc)
117{
Neil Horman4d93df02007-08-15 16:07:44 -0700118 int amt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Neil Horman4d93df02007-08-15 16:07:44 -0700120 if (asoc->ep->sndbuf_policy)
121 amt = asoc->sndbuf_used;
122 else
Eric Dumazet31e6d362009-06-17 19:05:41 -0700123 amt = sk_wmem_alloc_get(asoc->base.sk);
Neil Horman4d93df02007-08-15 16:07:44 -0700124
125 if (amt >= asoc->base.sk->sk_sndbuf) {
126 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
127 amt = 0;
128 else {
129 amt = sk_stream_wspace(asoc->base.sk);
130 if (amt < 0)
131 amt = 0;
132 }
Neil Horman4eb701d2005-04-28 12:02:04 -0700133 } else {
Neil Horman4d93df02007-08-15 16:07:44 -0700134 amt = asoc->base.sk->sk_sndbuf - amt;
Neil Horman4eb701d2005-04-28 12:02:04 -0700135 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 return amt;
137}
138
139/* Increment the used sndbuf space count of the corresponding association by
140 * the size of the outgoing data chunk.
141 * Also, set the skb destructor for sndbuf accounting later.
142 *
143 * Since it is always 1-1 between chunk and skb, and also a new skb is always
144 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
145 * destructor in the data chunk skb for the purpose of the sndbuf space
146 * tracking.
147 */
148static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
149{
150 struct sctp_association *asoc = chunk->asoc;
151 struct sock *sk = asoc->base.sk;
152
153 /* The sndbuf space is tracked per association. */
154 sctp_association_hold(asoc);
155
Neil Horman4eb701d2005-04-28 12:02:04 -0700156 skb_set_owner_w(chunk->skb, sk);
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 chunk->skb->destructor = sctp_wfree;
159 /* Save the chunk pointer in skb for sctp_wfree to use later. */
Daniel Borkmannf869c912014-11-20 01:54:48 +0100160 skb_shinfo(chunk->skb)->destructor_arg = chunk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Neil Horman4eb701d2005-04-28 12:02:04 -0700162 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
163 sizeof(struct sk_buff) +
164 sizeof(struct sctp_chunk);
165
Neil Horman4eb701d2005-04-28 12:02:04 -0700166 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
Hideo Aoki3ab224b2007-12-31 00:11:19 -0800167 sk->sk_wmem_queued += chunk->skb->truesize;
168 sk_mem_charge(sk, chunk->skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169}
170
171/* Verify that this is a valid address. */
172static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
173 int len)
174{
175 struct sctp_af *af;
176
177 /* Verify basic sockaddr. */
178 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
179 if (!af)
180 return -EINVAL;
181
182 /* Is this a valid SCTP address? */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700183 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return -EINVAL;
185
186 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
187 return -EINVAL;
188
189 return 0;
190}
191
192/* Look up the association by its id. If this is not a UDP-style
193 * socket, the ID field is always ignored.
194 */
195struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
196{
197 struct sctp_association *asoc = NULL;
198
199 /* If this is not a UDP-style socket, assoc id should be ignored. */
200 if (!sctp_style(sk, UDP)) {
201 /* Return NULL if the socket state is not ESTABLISHED. It
202 * could be a TCP-style listening socket or a socket which
203 * hasn't yet called connect() to establish an association.
204 */
Marcelo Ricardo Leitnere5b13f32016-07-15 16:38:19 -0300205 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 return NULL;
207
208 /* Get the first and the only association from the list. */
209 if (!list_empty(&sctp_sk(sk)->ep->asocs))
210 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
211 struct sctp_association, asocs);
212 return asoc;
213 }
214
215 /* Otherwise this is a UDP-style socket. */
216 if (!id || (id == (sctp_assoc_t)-1))
217 return NULL;
218
219 spin_lock_bh(&sctp_assocs_id_lock);
220 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
221 spin_unlock_bh(&sctp_assocs_id_lock);
222
223 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
224 return NULL;
225
226 return asoc;
227}
228
229/* Look up the transport from an address and an assoc id. If both address and
230 * id are specified, the associations matching the address and the id should be
231 * the same.
232 */
233static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
234 struct sockaddr_storage *addr,
235 sctp_assoc_t id)
236{
237 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
Xin Long6f29a132017-01-24 14:01:53 +0800238 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 union sctp_addr *laddr = (union sctp_addr *)addr;
Xin Long6f29a132017-01-24 14:01:53 +0800240 struct sctp_transport *transport;
241
Xin Long912964e2017-02-07 20:56:08 +0800242 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
Xin Long6f29a132017-01-24 14:01:53 +0800243 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
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
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600256 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 (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
Krister Johansen4548b682017-01-20 17:49:11 -0800367 if (snum && snum < inet_prot_sock(net) &&
Eric W. Biederman35946982012-11-16 03:03:12 +0000368 !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 Dumazetc720c7e82009-10-15 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 */
Marcelo Ricardo Leitner133800d2016-03-08 10:34:28 -0300393 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
394 SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
396 /* Copy back into socket for getsockname() use. */
397 if (!ret) {
Eric Dumazetc720c7e82009-10-15 06:30:45 +0000398 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
Jason Gunthorpe299ee122014-07-30 12:40:53 -0600399 sp->pf->to_sk_saddr(addr, sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 }
401
402 return ret;
403}
404
405 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
406 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900407 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 * at any one time. If a sender, after sending an ASCONF chunk, decides
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900409 * it needs to transfer another ASCONF Chunk, it MUST wait until the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900411 * subsequent ASCONF. Note this restriction binds each side, so at any
412 * time two ASCONF may be in-transit on any given association (one sent
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 * from each endpoint).
414 */
415static int sctp_send_asconf(struct sctp_association *asoc,
416 struct sctp_chunk *chunk)
417{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000418 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 int retval = 0;
420
421 /* If there is an outstanding ASCONF chunk, queue it for later
422 * transmission.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900423 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 if (asoc->addip_last_asconf) {
David S. Miller79af02c2005-07-08 21:47:49 -0700425 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900426 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 }
428
429 /* Hold the chunk until an ASCONF_ACK is received. */
430 sctp_chunk_hold(chunk);
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000431 retval = sctp_primitive_ASCONF(net, asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 if (retval)
433 sctp_chunk_free(chunk);
434 else
435 asoc->addip_last_asconf = chunk;
436
437out:
438 return retval;
439}
440
441/* Add a list of addresses as bind addresses to local endpoint or
442 * association.
443 *
444 * Basically run through each address specified in the addrs/addrcnt
445 * array/length pair, determine if it is IPv6 or IPv4 and call
446 * sctp_do_bind() on it.
447 *
448 * If any of them fails, then the operation will be reversed and the
449 * ones that were added will be removed.
450 *
451 * Only sctp_setsockopt_bindx() is supposed to call this function.
452 */
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +0200453static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454{
455 int cnt;
456 int retval = 0;
457 void *addr_buf;
458 struct sockaddr *sa_addr;
459 struct sctp_af *af;
460
Daniel Borkmannbb333812013-06-28 19:49:40 +0200461 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
462 addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463
464 addr_buf = addrs;
465 for (cnt = 0; cnt < addrcnt; cnt++) {
466 /* The list may contain either IPv4 or IPv6 address;
467 * determine the address length for walking thru the list.
468 */
Joe Perchesea110732011-06-13 16:21:26 +0000469 sa_addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 af = sctp_get_af_specific(sa_addr->sa_family);
471 if (!af) {
472 retval = -EINVAL;
473 goto err_bindx_add;
474 }
475
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900476 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 af->sockaddr_len);
478
479 addr_buf += af->sockaddr_len;
480
481err_bindx_add:
482 if (retval < 0) {
483 /* Failed. Cleanup the ones that have been added */
484 if (cnt > 0)
485 sctp_bindx_rem(sk, addrs, cnt);
486 return retval;
487 }
488 }
489
490 return retval;
491}
492
493/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
494 * associations that are part of the endpoint indicating that a list of local
495 * addresses are added to the endpoint.
496 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900497 * If any of the addresses is already in the bind address list of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 * association, we do not send the chunk for that association. But it will not
499 * affect other associations.
500 *
501 * Only sctp_setsockopt_bindx() is supposed to call this function.
502 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900503static int sctp_send_asconf_add_ip(struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 struct sockaddr *addrs,
505 int addrcnt)
506{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000507 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 struct sctp_sock *sp;
509 struct sctp_endpoint *ep;
510 struct sctp_association *asoc;
511 struct sctp_bind_addr *bp;
512 struct sctp_chunk *chunk;
513 struct sctp_sockaddr_entry *laddr;
514 union sctp_addr *addr;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700515 union sctp_addr saveaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 void *addr_buf;
517 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 struct list_head *p;
519 int i;
520 int retval = 0;
521
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000522 if (!net->sctp.addip_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 return retval;
524
525 sp = sctp_sk(sk);
526 ep = sp->ep;
527
Daniel Borkmannbb333812013-06-28 19:49:40 +0200528 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
529 __func__, sk, addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700531 list_for_each_entry(asoc, &ep->asocs, asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 if (!asoc->peer.asconf_capable)
533 continue;
534
535 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
536 continue;
537
538 if (!sctp_state(asoc, ESTABLISHED))
539 continue;
540
541 /* Check if any address in the packed array of addresses is
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900542 * in the bind address list of the association. If so,
543 * do not send the asconf chunk to its peer, but continue with
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 * other associations.
545 */
546 addr_buf = addrs;
547 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000548 addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 af = sctp_get_af_specific(addr->v4.sin_family);
550 if (!af) {
551 retval = -EINVAL;
552 goto out;
553 }
554
555 if (sctp_assoc_lookup_laddr(asoc, addr))
556 break;
557
558 addr_buf += af->sockaddr_len;
559 }
560 if (i < addrcnt)
561 continue;
562
Vlad Yasevich559cf712007-09-16 16:03:28 -0700563 /* Use the first valid address in bind addr list of
564 * association as Address Parameter of ASCONF CHUNK.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 bp = &asoc->base.bind_addr;
567 p = bp->address_list.next;
568 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
Al Viro5ae955c2006-11-20 17:22:08 -0800569 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 addrcnt, SCTP_PARAM_ADD_IP);
571 if (!chunk) {
572 retval = -ENOMEM;
573 goto out;
574 }
575
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700576 /* Add the new addresses to the bind address list with
577 * use_as_src set to 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 */
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700579 addr_buf = addrs;
580 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000581 addr = addr_buf;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700582 af = sctp_get_af_specific(addr->v4.sin_family);
583 memcpy(&saveaddr, addr, af->sockaddr_len);
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800584 retval = sctp_add_bind_addr(bp, &saveaddr,
Marcelo Ricardo Leitner133800d2016-03-08 10:34:28 -0300585 sizeof(saveaddr),
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800586 SCTP_ADDR_NEW, GFP_ATOMIC);
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700587 addr_buf += af->sockaddr_len;
588 }
Michio Honda8a07eb02011-04-26 20:19:36 +0900589 if (asoc->src_out_of_asoc_ok) {
590 struct sctp_transport *trans;
591
592 list_for_each_entry(trans,
593 &asoc->peer.transport_addr_list, transports) {
594 /* Clear the source and route cache */
Julian Anastasovc86a7732017-02-06 23:14:13 +0200595 sctp_transport_dst_release(trans);
Michio Honda8a07eb02011-04-26 20:19:36 +0900596 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
597 2*asoc->pathmtu, 4380));
598 trans->ssthresh = asoc->peer.i.a_rwnd;
599 trans->rto = asoc->rto_initial;
Michele Baldessari196d6752012-12-01 04:49:42 +0000600 sctp_max_rto(asoc, trans);
Michio Honda8a07eb02011-04-26 20:19:36 +0900601 trans->rtt = trans->srtt = trans->rttvar = 0;
602 sctp_transport_route(trans, NULL,
603 sctp_sk(asoc->base.sk));
604 }
605 }
606 retval = sctp_send_asconf(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 }
608
609out:
610 return retval;
611}
612
613/* Remove a list of addresses from bind addresses list. Do not remove the
614 * last address.
615 *
616 * Basically run through each address specified in the addrs/addrcnt
617 * array/length pair, determine if it is IPv6 or IPv4 and call
618 * sctp_del_bind() on it.
619 *
620 * If any of them fails, then the operation will be reversed and the
621 * ones that were removed will be added back.
622 *
623 * At least one address has to be left; if only one address is
624 * available, the operation will return -EBUSY.
625 *
626 * Only sctp_setsockopt_bindx() is supposed to call this function.
627 */
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +0200628static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629{
630 struct sctp_sock *sp = sctp_sk(sk);
631 struct sctp_endpoint *ep = sp->ep;
632 int cnt;
633 struct sctp_bind_addr *bp = &ep->base.bind_addr;
634 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 void *addr_buf;
Al Viroc9a08502006-11-20 17:07:48 -0800636 union sctp_addr *sa_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 struct sctp_af *af;
638
Daniel Borkmannbb333812013-06-28 19:49:40 +0200639 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
640 __func__, sk, addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
642 addr_buf = addrs;
643 for (cnt = 0; cnt < addrcnt; cnt++) {
644 /* If the bind address list is empty or if there is only one
645 * bind address, there is nothing more to be removed (we need
646 * at least one address here).
647 */
648 if (list_empty(&bp->address_list) ||
649 (sctp_list_single_entry(&bp->address_list))) {
650 retval = -EBUSY;
651 goto err_bindx_rem;
652 }
653
Joe Perchesea110732011-06-13 16:21:26 +0000654 sa_addr = addr_buf;
Al Viroc9a08502006-11-20 17:07:48 -0800655 af = sctp_get_af_specific(sa_addr->sa.sa_family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 if (!af) {
657 retval = -EINVAL;
658 goto err_bindx_rem;
659 }
Paolo Galtieri0304ff8a2007-04-17 12:52:36 -0700660
661 if (!af->addr_valid(sa_addr, sp, NULL)) {
662 retval = -EADDRNOTAVAIL;
663 goto err_bindx_rem;
664 }
665
Vlad Yasevichee9cbac2011-04-18 19:14:47 +0000666 if (sa_addr->v4.sin_port &&
667 sa_addr->v4.sin_port != htons(bp->port)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 retval = -EINVAL;
669 goto err_bindx_rem;
670 }
671
Vlad Yasevichee9cbac2011-04-18 19:14:47 +0000672 if (!sa_addr->v4.sin_port)
673 sa_addr->v4.sin_port = htons(bp->port);
674
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 /* FIXME - There is probably a need to check if sk->sk_saddr and
676 * sk->sk_rcv_addr are currently set to one of the addresses to
677 * be removed. This is something which needs to be looked into
678 * when we are fixing the outstanding issues with multi-homing
679 * socket routing and failover schemes. Refer to comments in
680 * sctp_do_bind(). -daisy
681 */
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -0400682 retval = sctp_del_bind_addr(bp, sa_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
684 addr_buf += af->sockaddr_len;
685err_bindx_rem:
686 if (retval < 0) {
687 /* Failed. Add the ones that has been removed back */
688 if (cnt > 0)
689 sctp_bindx_add(sk, addrs, cnt);
690 return retval;
691 }
692 }
693
694 return retval;
695}
696
697/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
698 * the associations that are part of the endpoint indicating that a list of
699 * local addresses are removed from the endpoint.
700 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900701 * If any of the addresses is already in the bind address list of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 * association, we do not send the chunk for that association. But it will not
703 * affect other associations.
704 *
705 * Only sctp_setsockopt_bindx() is supposed to call this function.
706 */
707static int sctp_send_asconf_del_ip(struct sock *sk,
708 struct sockaddr *addrs,
709 int addrcnt)
710{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000711 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 struct sctp_sock *sp;
713 struct sctp_endpoint *ep;
714 struct sctp_association *asoc;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700715 struct sctp_transport *transport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 struct sctp_bind_addr *bp;
717 struct sctp_chunk *chunk;
718 union sctp_addr *laddr;
719 void *addr_buf;
720 struct sctp_af *af;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700721 struct sctp_sockaddr_entry *saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 int i;
723 int retval = 0;
Michio Honda8a07eb02011-04-26 20:19:36 +0900724 int stored = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
Michio Honda8a07eb02011-04-26 20:19:36 +0900726 chunk = NULL;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000727 if (!net->sctp.addip_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 return retval;
729
730 sp = sctp_sk(sk);
731 ep = sp->ep;
732
Daniel Borkmannbb333812013-06-28 19:49:40 +0200733 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
734 __func__, sk, addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700736 list_for_each_entry(asoc, &ep->asocs, asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737
738 if (!asoc->peer.asconf_capable)
739 continue;
740
741 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
742 continue;
743
744 if (!sctp_state(asoc, ESTABLISHED))
745 continue;
746
747 /* Check if any address in the packed array of addresses is
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900748 * not present in the bind address list of the association.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 * If so, do not send the asconf chunk to its peer, but
750 * continue with other associations.
751 */
752 addr_buf = addrs;
753 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000754 laddr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 af = sctp_get_af_specific(laddr->v4.sin_family);
756 if (!af) {
757 retval = -EINVAL;
758 goto out;
759 }
760
761 if (!sctp_assoc_lookup_laddr(asoc, laddr))
762 break;
763
764 addr_buf += af->sockaddr_len;
765 }
766 if (i < addrcnt)
767 continue;
768
769 /* Find one address in the association's bind address list
770 * that is not in the packed array of addresses. This is to
771 * make sure that we do not delete all the addresses in the
772 * association.
773 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 bp = &asoc->base.bind_addr;
775 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
776 addrcnt, sp);
Michio Honda8a07eb02011-04-26 20:19:36 +0900777 if ((laddr == NULL) && (addrcnt == 1)) {
778 if (asoc->asconf_addr_del_pending)
779 continue;
780 asoc->asconf_addr_del_pending =
781 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
Michio Honda6d65e5e2011-06-10 16:42:14 +0900782 if (asoc->asconf_addr_del_pending == NULL) {
783 retval = -ENOMEM;
784 goto out;
785 }
Michio Honda8a07eb02011-04-26 20:19:36 +0900786 asoc->asconf_addr_del_pending->sa.sa_family =
787 addrs->sa_family;
788 asoc->asconf_addr_del_pending->v4.sin_port =
789 htons(bp->port);
790 if (addrs->sa_family == AF_INET) {
791 struct sockaddr_in *sin;
792
793 sin = (struct sockaddr_in *)addrs;
794 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
795 } else if (addrs->sa_family == AF_INET6) {
796 struct sockaddr_in6 *sin6;
797
798 sin6 = (struct sockaddr_in6 *)addrs;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000799 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
Michio Honda8a07eb02011-04-26 20:19:36 +0900800 }
Daniel Borkmannbb333812013-06-28 19:49:40 +0200801
802 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
803 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
804 asoc->asconf_addr_del_pending);
805
Michio Honda8a07eb02011-04-26 20:19:36 +0900806 asoc->src_out_of_asoc_ok = 1;
807 stored = 1;
808 goto skip_mkasconf;
809 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810
Daniel Borkmann88362ad2013-09-07 20:51:21 +0200811 if (laddr == NULL)
812 return -EINVAL;
813
Vlad Yasevich559cf712007-09-16 16:03:28 -0700814 /* We do not need RCU protection throughout this loop
815 * because this is done under a socket lock from the
816 * setsockopt call.
817 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
819 SCTP_PARAM_DEL_IP);
820 if (!chunk) {
821 retval = -ENOMEM;
822 goto out;
823 }
824
Michio Honda8a07eb02011-04-26 20:19:36 +0900825skip_mkasconf:
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700826 /* Reset use_as_src flag for the addresses in the bind address
827 * list that are to be deleted.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 */
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700829 addr_buf = addrs;
830 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000831 laddr = addr_buf;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700832 af = sctp_get_af_specific(laddr->v4.sin_family);
Vlad Yasevich559cf712007-09-16 16:03:28 -0700833 list_for_each_entry(saddr, &bp->address_list, list) {
Al Viro5f242a132006-11-20 17:05:23 -0800834 if (sctp_cmp_addr_exact(&saddr->a, laddr))
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800835 saddr->state = SCTP_ADDR_DEL;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700836 }
837 addr_buf += af->sockaddr_len;
838 }
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700839
840 /* Update the route and saddr entries for all the transports
841 * as some of the addresses in the bind address list are
842 * about to be deleted and cannot be used as source addresses.
843 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700844 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
845 transports) {
Julian Anastasovc86a7732017-02-06 23:14:13 +0200846 sctp_transport_dst_release(transport);
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700847 sctp_transport_route(transport, NULL,
848 sctp_sk(asoc->base.sk));
849 }
850
Michio Honda8a07eb02011-04-26 20:19:36 +0900851 if (stored)
852 /* We don't need to transmit ASCONF */
853 continue;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700854 retval = sctp_send_asconf(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 }
856out:
857 return retval;
858}
859
Michio Honda9f7d6532011-04-26 19:32:51 +0900860/* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
861int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
862{
863 struct sock *sk = sctp_opt2sk(sp);
864 union sctp_addr *addr;
865 struct sctp_af *af;
866
867 /* It is safe to write port space in caller. */
868 addr = &addrw->a;
869 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
870 af = sctp_get_af_specific(addr->sa.sa_family);
871 if (!af)
872 return -EINVAL;
873 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
874 return -EINVAL;
875
876 if (addrw->state == SCTP_ADDR_NEW)
877 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
878 else
879 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
880}
881
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
883 *
884 * API 8.1
885 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
886 * int flags);
887 *
888 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
889 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
890 * or IPv6 addresses.
891 *
892 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
893 * Section 3.1.2 for this usage.
894 *
895 * addrs is a pointer to an array of one or more socket addresses. Each
896 * address is contained in its appropriate structure (i.e. struct
897 * sockaddr_in or struct sockaddr_in6) the family of the address type
Ville Nuorvala23c435f2006-10-16 22:08:28 -0700898 * must be used to distinguish the address length (note that this
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 * representation is termed a "packed array" of addresses). The caller
900 * specifies the number of addresses in the array with addrcnt.
901 *
902 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
903 * -1, and sets errno to the appropriate error code.
904 *
905 * For SCTP, the port given in each socket address must be the same, or
906 * sctp_bindx() will fail, setting errno to EINVAL.
907 *
908 * The flags parameter is formed from the bitwise OR of zero or more of
909 * the following currently defined flags:
910 *
911 * SCTP_BINDX_ADD_ADDR
912 *
913 * SCTP_BINDX_REM_ADDR
914 *
915 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
916 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
917 * addresses from the association. The two flags are mutually exclusive;
918 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
919 * not remove all addresses from an association; sctp_bindx() will
920 * reject such an attempt with EINVAL.
921 *
922 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
923 * additional addresses with an endpoint after calling bind(). Or use
924 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
925 * socket is associated with so that no new association accepted will be
926 * associated with those addresses. If the endpoint supports dynamic
927 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
928 * endpoint to send the appropriate message to the peer to change the
929 * peers address lists.
930 *
931 * Adding and removing addresses from a connected association is
932 * optional functionality. Implementations that do not support this
933 * functionality should return EOPNOTSUPP.
934 *
935 * Basically do nothing but copying the addresses from user to kernel
936 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
Frank Filz3f7a87d2005-06-20 13:14:57 -0700937 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
938 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 *
940 * We don't use copy_from_user() for optimization: we first do the
941 * sanity checks (buffer size -fast- and access check-healthy
942 * pointer); if all of those succeed, then we can alloc the memory
943 * (expensive operation) needed to copy the data to kernel. Then we do
944 * the copying without checking the user space area
945 * (__copy_from_user()).
946 *
947 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
948 * it.
949 *
950 * sk The sk of the socket
951 * addrs The pointer to the addresses in user land
952 * addrssize Size of the addrs buffer
953 * op Operation to perform (add or remove, see the flags of
954 * sctp_bindx)
955 *
956 * Returns 0 if ok, <0 errno code on error.
957 */
wangweidong26ac8e52013-12-23 12:16:51 +0800958static int sctp_setsockopt_bindx(struct sock *sk,
Daniel Borkmanndda91922013-06-17 11:40:05 +0200959 struct sockaddr __user *addrs,
960 int addrs_size, int op)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961{
962 struct sockaddr *kaddrs;
963 int err;
964 int addrcnt = 0;
965 int walk_size = 0;
966 struct sockaddr *sa_addr;
967 void *addr_buf;
968 struct sctp_af *af;
969
Daniel Borkmannbb333812013-06-28 19:49:40 +0200970 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
971 __func__, sk, addrs, addrs_size, op);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972
973 if (unlikely(addrs_size <= 0))
974 return -EINVAL;
975
976 /* Check the user passed a healthy pointer. */
977 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
978 return -EFAULT;
979
980 /* Alloc space for the address array in kernel memory. */
Marcelo Ricardo Leitnercacc0622015-11-30 14:32:54 -0200981 kaddrs = kmalloc(addrs_size, GFP_USER | __GFP_NOWARN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 if (unlikely(!kaddrs))
983 return -ENOMEM;
984
985 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
986 kfree(kaddrs);
987 return -EFAULT;
988 }
989
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900990 /* Walk through the addrs buffer and count the number of addresses. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 addr_buf = kaddrs;
992 while (walk_size < addrs_size) {
Dan Rosenbergd7e0d192010-10-01 11:16:58 +0000993 if (walk_size + sizeof(sa_family_t) > addrs_size) {
994 kfree(kaddrs);
995 return -EINVAL;
996 }
997
Joe Perchesea110732011-06-13 16:21:26 +0000998 sa_addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 af = sctp_get_af_specific(sa_addr->sa_family);
1000
1001 /* If the address family is not supported or if this address
1002 * causes the address buffer to overflow return EINVAL.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001003 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1005 kfree(kaddrs);
1006 return -EINVAL;
1007 }
1008 addrcnt++;
1009 addr_buf += af->sockaddr_len;
1010 walk_size += af->sockaddr_len;
1011 }
1012
1013 /* Do the work. */
1014 switch (op) {
1015 case SCTP_BINDX_ADD_ADDR:
1016 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1017 if (err)
1018 goto out;
1019 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1020 break;
1021
1022 case SCTP_BINDX_REM_ADDR:
1023 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1024 if (err)
1025 goto out;
1026 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1027 break;
1028
1029 default:
1030 err = -EINVAL;
1031 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001032 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
1034out:
1035 kfree(kaddrs);
1036
1037 return err;
1038}
1039
Frank Filz3f7a87d2005-06-20 13:14:57 -07001040/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1041 *
1042 * Common routine for handling connect() and sctp_connectx().
1043 * Connect will come in with just a single address.
1044 */
wangweidong26ac8e52013-12-23 12:16:51 +08001045static int __sctp_connect(struct sock *sk,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001046 struct sockaddr *kaddrs,
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001047 int addrs_size,
1048 sctp_assoc_t *assoc_id)
Frank Filz3f7a87d2005-06-20 13:14:57 -07001049{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001050 struct net *net = sock_net(sk);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001051 struct sctp_sock *sp;
1052 struct sctp_endpoint *ep;
1053 struct sctp_association *asoc = NULL;
1054 struct sctp_association *asoc2;
1055 struct sctp_transport *transport;
1056 union sctp_addr to;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001057 sctp_scope_t scope;
1058 long timeo;
1059 int err = 0;
1060 int addrcnt = 0;
1061 int walk_size = 0;
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001062 union sctp_addr *sa_addr = NULL;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001063 void *addr_buf;
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001064 unsigned short port;
Vlad Yasevichf50f95c2007-07-03 12:47:40 -04001065 unsigned int f_flags = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001066
1067 sp = sctp_sk(sk);
1068 ep = sp->ep;
1069
1070 /* connect() cannot be done on a socket that is already in ESTABLISHED
1071 * state - UDP-style peeled off socket or a TCP-style socket that
1072 * is already connected.
1073 * It cannot be done even on a TCP-style listening socket.
1074 */
Marcelo Ricardo Leitnere5b13f32016-07-15 16:38:19 -03001075 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
Frank Filz3f7a87d2005-06-20 13:14:57 -07001076 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1077 err = -EISCONN;
1078 goto out_free;
1079 }
1080
1081 /* Walk through the addrs buffer and count the number of addresses. */
1082 addr_buf = kaddrs;
1083 while (walk_size < addrs_size) {
Jason Gunthorpe299ee122014-07-30 12:40:53 -06001084 struct sctp_af *af;
1085
Dan Rosenbergd7e0d192010-10-01 11:16:58 +00001086 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1087 err = -EINVAL;
1088 goto out_free;
1089 }
1090
Joe Perchesea110732011-06-13 16:21:26 +00001091 sa_addr = addr_buf;
Al Viro4bdf4b52006-11-20 17:10:20 -08001092 af = sctp_get_af_specific(sa_addr->sa.sa_family);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001093
1094 /* If the address family is not supported or if this address
1095 * causes the address buffer to overflow return EINVAL.
1096 */
1097 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1098 err = -EINVAL;
1099 goto out_free;
1100 }
1101
Dan Rosenbergd7e0d192010-10-01 11:16:58 +00001102 port = ntohs(sa_addr->v4.sin_port);
1103
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001104 /* Save current address so we can work with it */
1105 memcpy(&to, sa_addr, af->sockaddr_len);
1106
1107 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001108 if (err)
1109 goto out_free;
1110
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001111 /* Make sure the destination port is correctly set
1112 * in all addresses.
1113 */
Wei Yongjun524fba62013-04-03 03:02:28 +00001114 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1115 err = -EINVAL;
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001116 goto out_free;
Wei Yongjun524fba62013-04-03 03:02:28 +00001117 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001118
1119 /* Check if there already is a matching association on the
1120 * endpoint (other than the one created here).
1121 */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001122 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001123 if (asoc2 && asoc2 != asoc) {
1124 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1125 err = -EISCONN;
1126 else
1127 err = -EALREADY;
1128 goto out_free;
1129 }
1130
1131 /* If we could not find a matching association on the endpoint,
1132 * make sure that there is no peeled-off association matching
1133 * the peer address even on another socket.
1134 */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001135 if (sctp_endpoint_is_peeled_off(ep, &to)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -07001136 err = -EADDRNOTAVAIL;
1137 goto out_free;
1138 }
1139
1140 if (!asoc) {
1141 /* If a bind() or sctp_bindx() is not called prior to
1142 * an sctp_connectx() call, the system picks an
1143 * ephemeral port and will choose an address set
1144 * equivalent to binding with a wildcard address.
1145 */
1146 if (!ep->base.bind_addr.port) {
1147 if (sctp_autobind(sk)) {
1148 err = -EAGAIN;
1149 goto out_free;
1150 }
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001151 } else {
1152 /*
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001153 * If an unprivileged user inherits a 1-many
1154 * style socket with open associations on a
1155 * privileged port, it MAY be permitted to
1156 * accept new associations, but it SHOULD NOT
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001157 * be permitted to open new associations.
1158 */
Krister Johansen4548b682017-01-20 17:49:11 -08001159 if (ep->base.bind_addr.port <
1160 inet_prot_sock(net) &&
1161 !ns_capable(net->user_ns,
1162 CAP_NET_BIND_SERVICE)) {
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001163 err = -EACCES;
1164 goto out_free;
1165 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001166 }
1167
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001168 scope = sctp_scope(&to);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001169 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1170 if (!asoc) {
1171 err = -ENOMEM;
1172 goto out_free;
1173 }
Vlad Yasevich409b95a2009-11-10 08:57:34 +00001174
1175 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1176 GFP_KERNEL);
1177 if (err < 0) {
1178 goto out_free;
1179 }
1180
Frank Filz3f7a87d2005-06-20 13:14:57 -07001181 }
1182
1183 /* Prime the peer's transport structures. */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001184 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001185 SCTP_UNKNOWN);
1186 if (!transport) {
1187 err = -ENOMEM;
1188 goto out_free;
1189 }
1190
1191 addrcnt++;
1192 addr_buf += af->sockaddr_len;
1193 walk_size += af->sockaddr_len;
1194 }
1195
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001196 /* In case the user of sctp_connectx() wants an association
1197 * id back, assign one now.
1198 */
1199 if (assoc_id) {
1200 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1201 if (err < 0)
1202 goto out_free;
1203 }
1204
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001205 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001206 if (err < 0) {
1207 goto out_free;
1208 }
1209
1210 /* Initialize sk's dport and daddr for getpeername() */
Eric Dumazetc720c7e82009-10-15 06:30:45 +00001211 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
Jason Gunthorpe299ee122014-07-30 12:40:53 -06001212 sp->pf->to_sk_daddr(sa_addr, sk);
Sridhar Samudrala8de8c872006-05-19 10:58:12 -07001213 sk->sk_err = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001214
Vlad Yasevichf50f95c2007-07-03 12:47:40 -04001215 /* in-kernel sockets don't generally have a file allocated to them
1216 * if all they do is call sock_create_kern().
1217 */
1218 if (sk->sk_socket->file)
1219 f_flags = sk->sk_socket->file->f_flags;
1220
1221 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1222
Marcelo Ricardo Leitner7233bc82016-11-03 17:03:41 -02001223 if (assoc_id)
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001224 *assoc_id = asoc->assoc_id;
Marcelo Ricardo Leitner7233bc82016-11-03 17:03:41 -02001225 err = sctp_wait_for_connect(asoc, &timeo);
1226 /* Note: the asoc may be freed after the return of
1227 * sctp_wait_for_connect.
1228 */
Frank Filz3f7a87d2005-06-20 13:14:57 -07001229
1230 /* Don't free association on exit. */
1231 asoc = NULL;
1232
1233out_free:
Daniel Borkmannbb333812013-06-28 19:49:40 +02001234 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1235 __func__, asoc, kaddrs, err);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001236
Neil Horman2eebc1e2012-07-16 09:13:51 +00001237 if (asoc) {
1238 /* sctp_primitive_ASSOCIATE may have added this association
1239 * To the hash table, try to unhash it, just in case, its a noop
1240 * if it wasn't hashed so we're safe
1241 */
Frank Filz3f7a87d2005-06-20 13:14:57 -07001242 sctp_association_free(asoc);
Neil Horman2eebc1e2012-07-16 09:13:51 +00001243 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001244 return err;
1245}
1246
1247/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1248 *
1249 * API 8.9
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001250 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1251 * sctp_assoc_t *asoc);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001252 *
1253 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1254 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1255 * or IPv6 addresses.
1256 *
1257 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1258 * Section 3.1.2 for this usage.
1259 *
1260 * addrs is a pointer to an array of one or more socket addresses. Each
1261 * address is contained in its appropriate structure (i.e. struct
1262 * sockaddr_in or struct sockaddr_in6) the family of the address type
1263 * must be used to distengish the address length (note that this
1264 * representation is termed a "packed array" of addresses). The caller
1265 * specifies the number of addresses in the array with addrcnt.
1266 *
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001267 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1268 * the association id of the new association. On failure, sctp_connectx()
1269 * returns -1, and sets errno to the appropriate error code. The assoc_id
1270 * is not touched by the kernel.
Frank Filz3f7a87d2005-06-20 13:14:57 -07001271 *
1272 * For SCTP, the port given in each socket address must be the same, or
1273 * sctp_connectx() will fail, setting errno to EINVAL.
1274 *
1275 * An application can use sctp_connectx to initiate an association with
1276 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1277 * allows a caller to specify multiple addresses at which a peer can be
1278 * reached. The way the SCTP stack uses the list of addresses to set up
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001279 * the association is implementation dependent. This function only
Frank Filz3f7a87d2005-06-20 13:14:57 -07001280 * specifies that the stack will try to make use of all the addresses in
1281 * the list when needed.
1282 *
1283 * Note that the list of addresses passed in is only used for setting up
1284 * the association. It does not necessarily equal the set of addresses
1285 * the peer uses for the resulting association. If the caller wants to
1286 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1287 * retrieve them after the association has been set up.
1288 *
1289 * Basically do nothing but copying the addresses from user to kernel
1290 * land and invoking either sctp_connectx(). This is used for tunneling
1291 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1292 *
1293 * We don't use copy_from_user() for optimization: we first do the
1294 * sanity checks (buffer size -fast- and access check-healthy
1295 * pointer); if all of those succeed, then we can alloc the memory
1296 * (expensive operation) needed to copy the data to kernel. Then we do
1297 * the copying without checking the user space area
1298 * (__copy_from_user()).
1299 *
1300 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1301 * it.
1302 *
1303 * sk The sk of the socket
1304 * addrs The pointer to the addresses in user land
1305 * addrssize Size of the addrs buffer
1306 *
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001307 * Returns >=0 if ok, <0 errno code on error.
Frank Filz3f7a87d2005-06-20 13:14:57 -07001308 */
wangweidong26ac8e52013-12-23 12:16:51 +08001309static int __sctp_setsockopt_connectx(struct sock *sk,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001310 struct sockaddr __user *addrs,
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001311 int addrs_size,
1312 sctp_assoc_t *assoc_id)
Frank Filz3f7a87d2005-06-20 13:14:57 -07001313{
Frank Filz3f7a87d2005-06-20 13:14:57 -07001314 struct sockaddr *kaddrs;
Marcelo Ricardo Leitner9ba0b962015-12-23 16:28:40 -02001315 gfp_t gfp = GFP_KERNEL;
1316 int err = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001317
Daniel Borkmannbb333812013-06-28 19:49:40 +02001318 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1319 __func__, sk, addrs, addrs_size);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001320
1321 if (unlikely(addrs_size <= 0))
1322 return -EINVAL;
1323
1324 /* Check the user passed a healthy pointer. */
1325 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1326 return -EFAULT;
1327
1328 /* Alloc space for the address array in kernel memory. */
Marcelo Ricardo Leitner9ba0b962015-12-23 16:28:40 -02001329 if (sk->sk_socket->file)
1330 gfp = GFP_USER | __GFP_NOWARN;
1331 kaddrs = kmalloc(addrs_size, gfp);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001332 if (unlikely(!kaddrs))
1333 return -ENOMEM;
1334
1335 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1336 err = -EFAULT;
1337 } else {
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001338 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001339 }
1340
1341 kfree(kaddrs);
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001342
Frank Filz3f7a87d2005-06-20 13:14:57 -07001343 return err;
1344}
1345
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001346/*
1347 * This is an older interface. It's kept for backward compatibility
1348 * to the option that doesn't provide association id.
1349 */
wangweidong26ac8e52013-12-23 12:16:51 +08001350static int sctp_setsockopt_connectx_old(struct sock *sk,
Daniel Borkmanndda91922013-06-17 11:40:05 +02001351 struct sockaddr __user *addrs,
1352 int addrs_size)
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001353{
1354 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1355}
1356
1357/*
1358 * New interface for the API. The since the API is done with a socket
1359 * option, to make it simple we feed back the association id is as a return
1360 * indication to the call. Error is always negative and association id is
1361 * always positive.
1362 */
wangweidong26ac8e52013-12-23 12:16:51 +08001363static int sctp_setsockopt_connectx(struct sock *sk,
Daniel Borkmanndda91922013-06-17 11:40:05 +02001364 struct sockaddr __user *addrs,
1365 int addrs_size)
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001366{
1367 sctp_assoc_t assoc_id = 0;
1368 int err = 0;
1369
1370 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1371
1372 if (err)
1373 return err;
1374 else
1375 return assoc_id;
1376}
1377
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001378/*
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001379 * New (hopefully final) interface for the API.
1380 * We use the sctp_getaddrs_old structure so that use-space library
Daniel Borkmannffd59392014-02-17 12:11:11 +01001381 * can avoid any unnecessary allocations. The only different part
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001382 * is that we store the actual length of the address buffer into the
Daniel Borkmannffd59392014-02-17 12:11:11 +01001383 * addrs_num structure member. That way we can re-use the existing
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001384 * code.
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001385 */
Daniel Borkmannffd59392014-02-17 12:11:11 +01001386#ifdef CONFIG_COMPAT
1387struct compat_sctp_getaddrs_old {
1388 sctp_assoc_t assoc_id;
1389 s32 addr_num;
1390 compat_uptr_t addrs; /* struct sockaddr * */
1391};
1392#endif
1393
wangweidong26ac8e52013-12-23 12:16:51 +08001394static int sctp_getsockopt_connectx3(struct sock *sk, int len,
Daniel Borkmanndda91922013-06-17 11:40:05 +02001395 char __user *optval,
1396 int __user *optlen)
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001397{
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001398 struct sctp_getaddrs_old param;
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001399 sctp_assoc_t assoc_id = 0;
1400 int err = 0;
1401
Daniel Borkmannffd59392014-02-17 12:11:11 +01001402#ifdef CONFIG_COMPAT
Andy Lutomirski96c0e0a2016-03-22 14:25:07 -07001403 if (in_compat_syscall()) {
Daniel Borkmannffd59392014-02-17 12:11:11 +01001404 struct compat_sctp_getaddrs_old param32;
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001405
Daniel Borkmannffd59392014-02-17 12:11:11 +01001406 if (len < sizeof(param32))
1407 return -EINVAL;
1408 if (copy_from_user(&param32, optval, sizeof(param32)))
1409 return -EFAULT;
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001410
Daniel Borkmannffd59392014-02-17 12:11:11 +01001411 param.assoc_id = param32.assoc_id;
1412 param.addr_num = param32.addr_num;
1413 param.addrs = compat_ptr(param32.addrs);
1414 } else
1415#endif
1416 {
1417 if (len < sizeof(param))
1418 return -EINVAL;
1419 if (copy_from_user(&param, optval, sizeof(param)))
1420 return -EFAULT;
1421 }
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001422
Daniel Borkmannffd59392014-02-17 12:11:11 +01001423 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1424 param.addrs, param.addr_num,
1425 &assoc_id);
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001426 if (err == 0 || err == -EINPROGRESS) {
1427 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1428 return -EFAULT;
1429 if (put_user(sizeof(assoc_id), optlen))
1430 return -EFAULT;
1431 }
1432
1433 return err;
1434}
1435
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436/* API 3.1.4 close() - UDP Style Syntax
1437 * Applications use close() to perform graceful shutdown (as described in
1438 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1439 * by a UDP-style socket.
1440 *
1441 * The syntax is
1442 *
1443 * ret = close(int sd);
1444 *
1445 * sd - the socket descriptor of the associations to be closed.
1446 *
1447 * To gracefully shutdown a specific association represented by the
1448 * UDP-style socket, an application should use the sendmsg() call,
1449 * passing no user data, but including the appropriate flag in the
1450 * ancillary data (see Section xxxx).
1451 *
1452 * If sd in the close() call is a branched-off socket representing only
1453 * one association, the shutdown is performed on that association only.
1454 *
1455 * 4.1.6 close() - TCP Style Syntax
1456 *
1457 * Applications use close() to gracefully close down an association.
1458 *
1459 * The syntax is:
1460 *
1461 * int close(int sd);
1462 *
1463 * sd - the socket descriptor of the association to be closed.
1464 *
1465 * After an application calls close() on a socket descriptor, no further
1466 * socket operations will succeed on that descriptor.
1467 *
1468 * API 7.1.4 SO_LINGER
1469 *
1470 * An application using the TCP-style socket can use this option to
1471 * perform the SCTP ABORT primitive. The linger option structure is:
1472 *
1473 * struct linger {
1474 * int l_onoff; // option on/off
1475 * int l_linger; // linger time
1476 * };
1477 *
1478 * To enable the option, set l_onoff to 1. If the l_linger value is set
1479 * to 0, calling close() is the same as the ABORT primitive. If the
1480 * value is set to a negative value, the setsockopt() call will return
1481 * an error. If the value is set to a positive value linger_time, the
1482 * close() can be blocked for at most linger_time ms. If the graceful
1483 * shutdown phase does not finish during this period, close() will
1484 * return but the graceful shutdown phase continues in the system.
1485 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02001486static void sctp_close(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001488 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 struct sctp_endpoint *ep;
1490 struct sctp_association *asoc;
1491 struct list_head *pos, *temp;
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001492 unsigned int data_was_unread;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493
Daniel Borkmannbb333812013-06-28 19:49:40 +02001494 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495
wangweidong048ed4b2014-01-21 15:44:11 +08001496 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497 sk->sk_shutdown = SHUTDOWN_MASK;
Vlad Yasevichbec96402009-07-30 18:08:28 -04001498 sk->sk_state = SCTP_SS_CLOSING;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499
1500 ep = sctp_sk(sk)->ep;
1501
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001502 /* Clean up any skbs sitting on the receive queue. */
1503 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1504 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1505
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07001506 /* Walk all associations on an endpoint. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 list_for_each_safe(pos, temp, &ep->asocs) {
1508 asoc = list_entry(pos, struct sctp_association, asocs);
1509
1510 if (sctp_style(sk, TCP)) {
1511 /* A closed association can still be in the list if
1512 * it belongs to a TCP-style listening socket that is
1513 * not yet accepted. If so, free it. If not, send an
1514 * ABORT or SHUTDOWN based on the linger options.
1515 */
1516 if (sctp_state(asoc, CLOSED)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 sctp_association_free(asoc);
Vladislav Yasevichb89498a2006-05-19 14:32:06 -07001518 continue;
1519 }
1520 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001522 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1523 !skb_queue_empty(&asoc->ulpq.reasm) ||
1524 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
Sridhar Samudralab9ac8672006-08-28 13:53:01 -07001525 struct sctp_chunk *chunk;
1526
1527 chunk = sctp_make_abort_user(asoc, NULL, 0);
Xin Long068d8bd2015-12-29 17:49:25 +08001528 sctp_primitive_ABORT(net, asoc, chunk);
Sridhar Samudralab9ac8672006-08-28 13:53:01 -07001529 } else
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001530 sctp_primitive_SHUTDOWN(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 }
1532
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533 /* On a TCP-style socket, block for at most linger_time if set. */
1534 if (sctp_style(sk, TCP) && timeout)
1535 sctp_wait_for_close(sk, timeout);
1536
1537 /* This will run the backlog queue. */
wangweidong048ed4b2014-01-21 15:44:11 +08001538 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539
1540 /* Supposedly, no process has access to the socket, but
1541 * the net layers still may.
Marcelo Ricardo Leitner2d45a022015-06-12 10:16:41 -03001542 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1543 * held and that should be grabbed before socket lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544 */
Marcelo Ricardo Leitner2d45a022015-06-12 10:16:41 -03001545 spin_lock_bh(&net->sctp.addr_wq_lock);
wangweidong5bc1d1b2014-01-21 15:44:12 +08001546 bh_lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547
1548 /* Hold the sock, since sk_common_release() will put sock_put()
1549 * and we have just a little more cleanup.
1550 */
1551 sock_hold(sk);
1552 sk_common_release(sk);
1553
wangweidong5bc1d1b2014-01-21 15:44:12 +08001554 bh_unlock_sock(sk);
Marcelo Ricardo Leitner2d45a022015-06-12 10:16:41 -03001555 spin_unlock_bh(&net->sctp.addr_wq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556
1557 sock_put(sk);
1558
1559 SCTP_DBG_OBJCNT_DEC(sock);
1560}
1561
1562/* Handle EPIPE error. */
1563static int sctp_error(struct sock *sk, int flags, int err)
1564{
1565 if (err == -EPIPE)
1566 err = sock_error(sk) ? : -EPIPE;
1567 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1568 send_sig(SIGPIPE, current, 0);
1569 return err;
1570}
1571
1572/* API 3.1.3 sendmsg() - UDP Style Syntax
1573 *
1574 * An application uses sendmsg() and recvmsg() calls to transmit data to
1575 * and receive data from its peer.
1576 *
1577 * ssize_t sendmsg(int socket, const struct msghdr *message,
1578 * int flags);
1579 *
1580 * socket - the socket descriptor of the endpoint.
1581 * message - pointer to the msghdr structure which contains a single
1582 * user message and possibly some ancillary data.
1583 *
1584 * See Section 5 for complete description of the data
1585 * structures.
1586 *
1587 * flags - flags sent or received with the user message, see Section
1588 * 5 for complete description of the flags.
1589 *
1590 * Note: This function could use a rewrite especially when explicit
1591 * connect support comes in.
1592 */
1593/* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1594
Daniel Borkmanndda91922013-06-17 11:40:05 +02001595static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596
Ying Xue1b784142015-03-02 15:37:48 +08001597static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001599 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 struct sctp_sock *sp;
1601 struct sctp_endpoint *ep;
wangweidongcb3f8372013-12-23 12:16:50 +08001602 struct sctp_association *new_asoc = NULL, *asoc = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 struct sctp_transport *transport, *chunk_tp;
1604 struct sctp_chunk *chunk;
Al Virodce116a2006-11-20 17:25:15 -08001605 union sctp_addr to;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 struct sockaddr *msg_name = NULL;
Joe Perches517aa0b2011-05-12 11:27:20 +00001607 struct sctp_sndrcvinfo default_sinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 struct sctp_sndrcvinfo *sinfo;
1609 struct sctp_initmsg *sinit;
1610 sctp_assoc_t associd = 0;
1611 sctp_cmsgs_t cmsgs = { NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 sctp_scope_t scope;
Daniel Borkmann2061dcd2015-01-15 16:34:35 +01001613 bool fill_sinfo_ttl = false, wait_connect = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 struct sctp_datamsg *datamsg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615 int msg_flags = msg->msg_flags;
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02001616 __u16 sinfo_flags = 0;
1617 long timeo;
1618 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 err = 0;
1621 sp = sctp_sk(sk);
1622 ep = sp->ep;
1623
Daniel Borkmannbb333812013-06-28 19:49:40 +02001624 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
1625 msg, msg_len, ep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626
1627 /* We cannot send a message over a TCP-style listening socket. */
1628 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1629 err = -EPIPE;
1630 goto out_nounlock;
1631 }
1632
1633 /* Parse out the SCTP CMSGs. */
1634 err = sctp_msghdr_parse(msg, &cmsgs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635 if (err) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02001636 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637 goto out_nounlock;
1638 }
1639
1640 /* Fetch the destination address for this packet. This
1641 * address only selects the association--it is not necessarily
1642 * the address we will send to.
1643 * For a peeled-off socket, msg_name is ignored.
1644 */
1645 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1646 int msg_namelen = msg->msg_namelen;
1647
1648 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1649 msg_namelen);
1650 if (err)
1651 return err;
1652
1653 if (msg_namelen > sizeof(to))
1654 msg_namelen = sizeof(to);
1655 memcpy(&to, msg->msg_name, msg_namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 msg_name = msg->msg_name;
1657 }
1658
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659 sinit = cmsgs.init;
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02001660 if (cmsgs.sinfo != NULL) {
1661 memset(&default_sinfo, 0, sizeof(default_sinfo));
1662 default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
1663 default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
1664 default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
1665 default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
1666 default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02001668 sinfo = &default_sinfo;
1669 fill_sinfo_ttl = true;
1670 } else {
1671 sinfo = cmsgs.srinfo;
1672 }
1673 /* Did the user specify SNDINFO/SNDRCVINFO? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 if (sinfo) {
1675 sinfo_flags = sinfo->sinfo_flags;
1676 associd = sinfo->sinfo_assoc_id;
1677 }
1678
Daniel Borkmannbb333812013-06-28 19:49:40 +02001679 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
1680 msg_len, sinfo_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001682 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1683 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 err = -EINVAL;
1685 goto out_nounlock;
1686 }
1687
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001688 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1689 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1690 * If SCTP_ABORT is set, the message length could be non zero with
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 * the msg_iov set to the user abort reason.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001692 */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001693 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1694 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695 err = -EINVAL;
1696 goto out_nounlock;
1697 }
1698
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001699 /* If SCTP_ADDR_OVER is set, there must be an address
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 * specified in msg_name.
1701 */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001702 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 err = -EINVAL;
1704 goto out_nounlock;
1705 }
1706
1707 transport = NULL;
1708
Daniel Borkmannbb333812013-06-28 19:49:40 +02001709 pr_debug("%s: about to look up association\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710
wangweidong048ed4b2014-01-21 15:44:11 +08001711 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712
1713 /* If a msg_name has been specified, assume this is to be used. */
1714 if (msg_name) {
1715 /* Look for a matching association on the endpoint. */
Al Virodce116a2006-11-20 17:25:15 -08001716 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
Marcelo Ricardo Leitnere5b13f32016-07-15 16:38:19 -03001717
1718 /* If we could not find a matching association on the
1719 * endpoint, make sure that it is not a TCP-style
1720 * socket that already has an association or there is
1721 * no peeled-off association on another socket.
1722 */
1723 if (!asoc &&
1724 ((sctp_style(sk, TCP) &&
1725 (sctp_sstate(sk, ESTABLISHED) ||
1726 sctp_sstate(sk, CLOSING))) ||
1727 sctp_endpoint_is_peeled_off(ep, &to))) {
1728 err = -EADDRNOTAVAIL;
1729 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 }
1731 } else {
1732 asoc = sctp_id2assoc(sk, associd);
1733 if (!asoc) {
1734 err = -EPIPE;
1735 goto out_unlock;
1736 }
1737 }
1738
1739 if (asoc) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02001740 pr_debug("%s: just looked up association:%p\n", __func__, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741
1742 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1743 * socket that has an association in CLOSED state. This can
1744 * happen when an accepted socket has an association that is
1745 * already CLOSED.
1746 */
1747 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1748 err = -EPIPE;
1749 goto out_unlock;
1750 }
1751
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001752 if (sinfo_flags & SCTP_EOF) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02001753 pr_debug("%s: shutting down association:%p\n",
1754 __func__, asoc);
1755
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001756 sctp_primitive_SHUTDOWN(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757 err = 0;
1758 goto out_unlock;
1759 }
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001760 if (sinfo_flags & SCTP_ABORT) {
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001761
1762 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1763 if (!chunk) {
1764 err = -ENOMEM;
1765 goto out_unlock;
1766 }
1767
Daniel Borkmannbb333812013-06-28 19:49:40 +02001768 pr_debug("%s: aborting association:%p\n",
1769 __func__, asoc);
1770
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001771 sctp_primitive_ABORT(net, asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772 err = 0;
1773 goto out_unlock;
1774 }
1775 }
1776
1777 /* Do we need to create the association? */
1778 if (!asoc) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02001779 pr_debug("%s: there is no association yet\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001781 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782 err = -EINVAL;
1783 goto out_unlock;
1784 }
1785
1786 /* Check for invalid stream against the stream counts,
1787 * either the default or the user specified stream counts.
1788 */
1789 if (sinfo) {
Dan Carpenter0e864b22014-01-13 16:46:08 +03001790 if (!sinit || !sinit->sinit_num_ostreams) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791 /* Check against the defaults. */
1792 if (sinfo->sinfo_stream >=
1793 sp->initmsg.sinit_num_ostreams) {
1794 err = -EINVAL;
1795 goto out_unlock;
1796 }
1797 } else {
1798 /* Check against the requested. */
1799 if (sinfo->sinfo_stream >=
1800 sinit->sinit_num_ostreams) {
1801 err = -EINVAL;
1802 goto out_unlock;
1803 }
1804 }
1805 }
1806
1807 /*
1808 * API 3.1.2 bind() - UDP Style Syntax
1809 * If a bind() or sctp_bindx() is not called prior to a
1810 * sendmsg() call that initiates a new association, the
1811 * system picks an ephemeral port and will choose an address
1812 * set equivalent to binding with a wildcard address.
1813 */
1814 if (!ep->base.bind_addr.port) {
1815 if (sctp_autobind(sk)) {
1816 err = -EAGAIN;
1817 goto out_unlock;
1818 }
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001819 } else {
1820 /*
1821 * If an unprivileged user inherits a one-to-many
1822 * style socket with open associations on a privileged
1823 * port, it MAY be permitted to accept new associations,
1824 * but it SHOULD NOT be permitted to open new
1825 * associations.
1826 */
Krister Johansen4548b682017-01-20 17:49:11 -08001827 if (ep->base.bind_addr.port < inet_prot_sock(net) &&
Eric W. Biederman35946982012-11-16 03:03:12 +00001828 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001829 err = -EACCES;
1830 goto out_unlock;
1831 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832 }
1833
1834 scope = sctp_scope(&to);
1835 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1836 if (!new_asoc) {
1837 err = -ENOMEM;
1838 goto out_unlock;
1839 }
1840 asoc = new_asoc;
Vlad Yasevich409b95a2009-11-10 08:57:34 +00001841 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1842 if (err < 0) {
1843 err = -ENOMEM;
1844 goto out_free;
1845 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846
1847 /* If the SCTP_INIT ancillary data is specified, set all
1848 * the association init values accordingly.
1849 */
1850 if (sinit) {
1851 if (sinit->sinit_num_ostreams) {
1852 asoc->c.sinit_num_ostreams =
1853 sinit->sinit_num_ostreams;
1854 }
1855 if (sinit->sinit_max_instreams) {
1856 asoc->c.sinit_max_instreams =
1857 sinit->sinit_max_instreams;
1858 }
1859 if (sinit->sinit_max_attempts) {
1860 asoc->max_init_attempts
1861 = sinit->sinit_max_attempts;
1862 }
1863 if (sinit->sinit_max_init_timeo) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001864 asoc->max_init_timeo =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1866 }
1867 }
1868
1869 /* Prime the peer's transport structures. */
Al Virodce116a2006-11-20 17:25:15 -08001870 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871 if (!transport) {
1872 err = -ENOMEM;
1873 goto out_free;
1874 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 }
1876
1877 /* ASSERT: we have a valid association at this point. */
Daniel Borkmannbb333812013-06-28 19:49:40 +02001878 pr_debug("%s: we have a valid association\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879
1880 if (!sinfo) {
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02001881 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1882 * one with some defaults.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883 */
Joe Perches517aa0b2011-05-12 11:27:20 +00001884 memset(&default_sinfo, 0, sizeof(default_sinfo));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885 default_sinfo.sinfo_stream = asoc->default_stream;
1886 default_sinfo.sinfo_flags = asoc->default_flags;
1887 default_sinfo.sinfo_ppid = asoc->default_ppid;
1888 default_sinfo.sinfo_context = asoc->default_context;
1889 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1890 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02001891
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 sinfo = &default_sinfo;
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02001893 } else if (fill_sinfo_ttl) {
1894 /* In case SNDINFO was specified, we still need to fill
1895 * it with a default ttl from the assoc here.
1896 */
1897 sinfo->sinfo_timetolive = asoc->default_timetolive;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898 }
1899
1900 /* API 7.1.7, the sndbuf size per association bounds the
1901 * maximum size of data that can be sent in a single send call.
1902 */
1903 if (msg_len > sk->sk_sndbuf) {
1904 err = -EMSGSIZE;
1905 goto out_free;
1906 }
1907
Vlad Yasevich8a479492007-06-07 14:21:05 -04001908 if (asoc->pmtu_pending)
David S. Miller02f3d4c2012-07-16 03:57:14 -07001909 sctp_assoc_pending_pmtu(sk, asoc);
Vlad Yasevich8a479492007-06-07 14:21:05 -04001910
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 /* If fragmentation is disabled and the message length exceeds the
1912 * association fragmentation point, return EMSGSIZE. The I-D
1913 * does not specify what this error is, but this looks like
1914 * a great fit.
1915 */
1916 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1917 err = -EMSGSIZE;
1918 goto out_free;
1919 }
1920
Joe Perchesafd76142011-05-12 09:19:10 +00001921 /* Check for invalid stream. */
1922 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1923 err = -EINVAL;
1924 goto out_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925 }
1926
Xin Long8dbdf1f2016-07-09 19:47:45 +08001927 if (sctp_wspace(asoc) < msg_len)
1928 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1929
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1931 if (!sctp_wspace(asoc)) {
1932 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1933 if (err)
1934 goto out_free;
1935 }
1936
1937 /* If an address is passed with the sendto/sendmsg call, it is used
1938 * to override the primary destination address in the TCP model, or
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001939 * when SCTP_ADDR_OVER flag is set in the UDP model.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940 */
1941 if ((sctp_style(sk, TCP) && msg_name) ||
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001942 (sinfo_flags & SCTP_ADDR_OVER)) {
Al Virodce116a2006-11-20 17:25:15 -08001943 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944 if (!chunk_tp) {
1945 err = -EINVAL;
1946 goto out_free;
1947 }
1948 } else
1949 chunk_tp = NULL;
1950
1951 /* Auto-connect, if we aren't connected already. */
1952 if (sctp_state(asoc, CLOSED)) {
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001953 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954 if (err < 0)
1955 goto out_free;
Daniel Borkmannbb333812013-06-28 19:49:40 +02001956
Daniel Borkmann2061dcd2015-01-15 16:34:35 +01001957 wait_connect = true;
Daniel Borkmannbb333812013-06-28 19:49:40 +02001958 pr_debug("%s: we associated primitively\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959 }
1960
1961 /* Break the message into multiple chunks of maximum size. */
Al Viroc0371da2014-11-24 10:42:55 -05001962 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
Tommi Rantala6e51fe72012-11-22 03:23:16 +00001963 if (IS_ERR(datamsg)) {
1964 err = PTR_ERR(datamsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965 goto out_free;
1966 }
Xin Long4ea0c322017-02-19 01:52:46 +08001967 datamsg->force_delay = !!(msg->msg_flags & MSG_MORE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968
1969 /* Now send the (possibly) fragmented message. */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07001970 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
Xin Longb61c6542016-09-14 02:04:20 +08001971 sctp_chunk_hold(chunk);
1972
Linus Torvalds1da177e2005-04-16 15:20:36 -07001973 /* Do accounting for the write space. */
1974 sctp_set_owner_w(chunk);
1975
1976 chunk->transport = chunk_tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977 }
1978
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001979 /* Send it to the lower layers. Note: all chunks
1980 * must either fail or succeed. The lower layer
1981 * works that way today. Keep it that way or this
1982 * breaks.
1983 */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001984 err = sctp_primitive_SEND(net, asoc, datamsg);
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001985 /* Did the lower layer accept the chunk? */
Xin Longb61c6542016-09-14 02:04:20 +08001986 if (err) {
1987 sctp_datamsg_free(datamsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988 goto out_free;
Xin Longb61c6542016-09-14 02:04:20 +08001989 }
Daniel Borkmannbb333812013-06-28 19:49:40 +02001990
1991 pr_debug("%s: we sent primitively\n", __func__);
1992
Xin Longb61c6542016-09-14 02:04:20 +08001993 sctp_datamsg_put(datamsg);
Daniel Borkmannbb333812013-06-28 19:49:40 +02001994 err = msg_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995
Daniel Borkmann2061dcd2015-01-15 16:34:35 +01001996 if (unlikely(wait_connect)) {
1997 timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
1998 sctp_wait_for_connect(asoc, &timeo);
1999 }
2000
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001 /* If we are already past ASSOCIATE, the lower
2002 * layers are responsible for association cleanup.
2003 */
2004 goto out_unlock;
2005
2006out_free:
Xin Longb5eff712015-12-30 23:50:49 +08002007 if (new_asoc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008 sctp_association_free(asoc);
2009out_unlock:
wangweidong048ed4b2014-01-21 15:44:11 +08002010 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011
2012out_nounlock:
2013 return sctp_error(sk, msg_flags, err);
2014
2015#if 0
2016do_sock_err:
2017 if (msg_len)
2018 err = msg_len;
2019 else
2020 err = sock_error(sk);
2021 goto out;
2022
2023do_interrupted:
2024 if (msg_len)
2025 err = msg_len;
2026 goto out;
2027#endif /* 0 */
2028}
2029
2030/* This is an extended version of skb_pull() that removes the data from the
2031 * start of a skb even when data is spread across the list of skb's in the
2032 * frag_list. len specifies the total amount of data that needs to be removed.
2033 * when 'len' bytes could be removed from the skb, it returns 0.
2034 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2035 * could not be removed.
2036 */
2037static int sctp_skb_pull(struct sk_buff *skb, int len)
2038{
2039 struct sk_buff *list;
2040 int skb_len = skb_headlen(skb);
2041 int rlen;
2042
2043 if (len <= skb_len) {
2044 __skb_pull(skb, len);
2045 return 0;
2046 }
2047 len -= skb_len;
2048 __skb_pull(skb, skb_len);
2049
David S. Miller1b003be2009-06-09 00:22:35 -07002050 skb_walk_frags(skb, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 rlen = sctp_skb_pull(list, len);
2052 skb->len -= (len-rlen);
2053 skb->data_len -= (len-rlen);
2054
2055 if (!rlen)
2056 return 0;
2057
2058 len = rlen;
2059 }
2060
2061 return len;
2062}
2063
2064/* API 3.1.3 recvmsg() - UDP Style Syntax
2065 *
2066 * ssize_t recvmsg(int socket, struct msghdr *message,
2067 * int flags);
2068 *
2069 * socket - the socket descriptor of the endpoint.
2070 * message - pointer to the msghdr structure which contains a single
2071 * user message and possibly some ancillary data.
2072 *
2073 * See Section 5 for complete description of the data
2074 * structures.
2075 *
2076 * flags - flags sent or received with the user message, see Section
2077 * 5 for complete description of the flags.
2078 */
Ying Xue1b784142015-03-02 15:37:48 +08002079static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2080 int noblock, int flags, int *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081{
2082 struct sctp_ulpevent *event = NULL;
2083 struct sctp_sock *sp = sctp_sk(sk);
Marcelo Ricardo Leitner1f45f782016-07-13 15:08:57 -03002084 struct sk_buff *skb, *head_skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085 int copied;
2086 int err = 0;
2087 int skb_len;
2088
Daniel Borkmannbb333812013-06-28 19:49:40 +02002089 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2090 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2091 addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092
wangweidong048ed4b2014-01-21 15:44:11 +08002093 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094
Marcelo Ricardo Leitnere5b13f32016-07-15 16:38:19 -03002095 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
Xin Longe0878692016-07-30 14:14:41 +08002096 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097 err = -ENOTCONN;
2098 goto out;
2099 }
2100
2101 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2102 if (!skb)
2103 goto out;
2104
2105 /* Get the total length of the skb including any skb's in the
2106 * frag_list.
2107 */
2108 skb_len = skb->len;
2109
2110 copied = skb_len;
2111 if (copied > len)
2112 copied = len;
2113
David S. Miller51f3d022014-11-05 16:46:40 -05002114 err = skb_copy_datagram_msg(skb, 0, msg, copied);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115
2116 event = sctp_skb2event(skb);
2117
2118 if (err)
2119 goto out_free;
2120
Marcelo Ricardo Leitner1f45f782016-07-13 15:08:57 -03002121 if (event->chunk && event->chunk->head_skb)
2122 head_skb = event->chunk->head_skb;
2123 else
2124 head_skb = skb;
2125 sock_recv_ts_and_drops(msg, sk, head_skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126 if (sctp_ulpevent_is_notification(event)) {
2127 msg->msg_flags |= MSG_NOTIFICATION;
2128 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2129 } else {
Marcelo Ricardo Leitner1f45f782016-07-13 15:08:57 -03002130 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131 }
2132
Geir Ola Vaagland2347c802014-07-12 20:30:38 +02002133 /* Check if we allow SCTP_NXTINFO. */
2134 if (sp->recvnxtinfo)
2135 sctp_ulpevent_read_nxtinfo(event, msg, sk);
Geir Ola Vaagland0d3a4212014-07-12 20:30:37 +02002136 /* Check if we allow SCTP_RCVINFO. */
2137 if (sp->recvrcvinfo)
2138 sctp_ulpevent_read_rcvinfo(event, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139 /* Check if we allow SCTP_SNDRCVINFO. */
2140 if (sp->subscribe.sctp_data_io_event)
2141 sctp_ulpevent_read_sndrcvinfo(event, msg);
Geir Ola Vaagland0d3a4212014-07-12 20:30:37 +02002142
Linus Torvalds1da177e2005-04-16 15:20:36 -07002143 err = copied;
2144
2145 /* If skb's length exceeds the user's buffer, update the skb and
2146 * push it back to the receive_queue so that the next call to
2147 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2148 */
2149 if (skb_len > copied) {
2150 msg->msg_flags &= ~MSG_EOR;
2151 if (flags & MSG_PEEK)
2152 goto out_free;
2153 sctp_skb_pull(skb, copied);
2154 skb_queue_head(&sk->sk_receive_queue, skb);
2155
Daniel Borkmann362d5202014-04-14 21:45:17 +02002156 /* When only partial message is copied to the user, increase
2157 * rwnd by that amount. If all the data in the skb is read,
2158 * rwnd is updated when the event is freed.
2159 */
2160 if (!sctp_ulpevent_is_notification(event))
2161 sctp_assoc_rwnd_increase(event->asoc, copied);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002162 goto out;
2163 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2164 (event->msg_flags & MSG_EOR))
2165 msg->msg_flags |= MSG_EOR;
2166 else
2167 msg->msg_flags &= ~MSG_EOR;
2168
2169out_free:
2170 if (flags & MSG_PEEK) {
2171 /* Release the skb reference acquired after peeking the skb in
2172 * sctp_skb_recv_datagram().
2173 */
2174 kfree_skb(skb);
2175 } else {
2176 /* Free the event which includes releasing the reference to
2177 * the owner of the skb, freeing the skb and updating the
2178 * rwnd.
2179 */
2180 sctp_ulpevent_free(event);
2181 }
2182out:
wangweidong048ed4b2014-01-21 15:44:11 +08002183 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002184 return err;
2185}
2186
2187/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2188 *
2189 * This option is a on/off flag. If enabled no SCTP message
2190 * fragmentation will be performed. Instead if a message being sent
2191 * exceeds the current PMTU size, the message will NOT be sent and
2192 * instead a error will be indicated to the user.
2193 */
2194static int sctp_setsockopt_disable_fragments(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002195 char __user *optval,
2196 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002197{
2198 int val;
2199
2200 if (optlen < sizeof(int))
2201 return -EINVAL;
2202
2203 if (get_user(val, (int __user *)optval))
2204 return -EFAULT;
2205
2206 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2207
2208 return 0;
2209}
2210
2211static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002212 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002213{
Wei Yongjun94912302011-07-02 09:28:04 +00002214 struct sctp_association *asoc;
2215 struct sctp_ulpevent *event;
2216
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05002217 if (optlen > sizeof(struct sctp_event_subscribe))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002218 return -EINVAL;
2219 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2220 return -EFAULT;
Wei Yongjun94912302011-07-02 09:28:04 +00002221
Daniel Borkmannbbbea412014-07-12 20:30:40 +02002222 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
Wei Yongjun94912302011-07-02 09:28:04 +00002223 * if there is no data to be sent or retransmit, the stack will
2224 * immediately send up this notification.
2225 */
2226 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2227 &sctp_sk(sk)->subscribe)) {
2228 asoc = sctp_id2assoc(sk, 0);
2229
2230 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2231 event = sctp_ulpevent_make_sender_dry_event(asoc,
2232 GFP_ATOMIC);
2233 if (!event)
2234 return -ENOMEM;
2235
2236 sctp_ulpq_tail_event(&asoc->ulpq, event);
2237 }
2238 }
2239
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240 return 0;
2241}
2242
2243/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2244 *
2245 * This socket option is applicable to the UDP-style socket only. When
2246 * set it will cause associations that are idle for more than the
2247 * specified number of seconds to automatically close. An association
2248 * being idle is defined an association that has NOT sent or received
2249 * user data. The special value of '0' indicates that no automatic
2250 * close of any associations should be performed. The option expects an
2251 * integer defining the number of seconds of idle time before an
2252 * association is closed.
2253 */
2254static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002255 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256{
2257 struct sctp_sock *sp = sctp_sk(sk);
Neil Horman9f70f462013-12-10 06:48:15 -05002258 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002259
2260 /* Applicable to UDP-style socket only */
2261 if (sctp_style(sk, TCP))
2262 return -EOPNOTSUPP;
2263 if (optlen != sizeof(int))
2264 return -EINVAL;
2265 if (copy_from_user(&sp->autoclose, optval, optlen))
2266 return -EFAULT;
2267
Neil Horman9f70f462013-12-10 06:48:15 -05002268 if (sp->autoclose > net->sctp.max_autoclose)
2269 sp->autoclose = net->sctp.max_autoclose;
2270
Linus Torvalds1da177e2005-04-16 15:20:36 -07002271 return 0;
2272}
2273
2274/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2275 *
2276 * Applications can enable or disable heartbeats for any peer address of
2277 * an association, modify an address's heartbeat interval, force a
2278 * heartbeat to be sent immediately, and adjust the address's maximum
2279 * number of retransmissions sent before an address is considered
2280 * unreachable. The following structure is used to access and modify an
2281 * address's parameters:
2282 *
2283 * struct sctp_paddrparams {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002284 * sctp_assoc_t spp_assoc_id;
2285 * struct sockaddr_storage spp_address;
2286 * uint32_t spp_hbinterval;
2287 * uint16_t spp_pathmaxrxt;
2288 * uint32_t spp_pathmtu;
2289 * uint32_t spp_sackdelay;
2290 * uint32_t spp_flags;
2291 * };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08002293 * spp_assoc_id - (one-to-many style socket) This is filled in the
2294 * application, and identifies the association for
2295 * this query.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002296 * spp_address - This specifies which address is of interest.
2297 * spp_hbinterval - This contains the value of the heartbeat interval,
Frank Filz52ccb8e2005-12-22 11:36:46 -08002298 * in milliseconds. If a value of zero
2299 * is present in this field then no changes are to
2300 * be made to this parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002301 * spp_pathmaxrxt - This contains the maximum number of
2302 * retransmissions before this address shall be
Frank Filz52ccb8e2005-12-22 11:36:46 -08002303 * considered unreachable. If a value of zero
2304 * is present in this field then no changes are to
2305 * be made to this parameter.
2306 * spp_pathmtu - When Path MTU discovery is disabled the value
2307 * specified here will be the "fixed" path mtu.
2308 * Note that if the spp_address field is empty
2309 * then all associations on this address will
2310 * have this fixed path mtu set upon them.
2311 *
2312 * spp_sackdelay - When delayed sack is enabled, this value specifies
2313 * the number of milliseconds that sacks will be delayed
2314 * for. This value will apply to all addresses of an
2315 * association if the spp_address field is empty. Note
2316 * also, that if delayed sack is enabled and this
2317 * value is set to 0, no change is made to the last
2318 * recorded delayed sack timer value.
2319 *
2320 * spp_flags - These flags are used to control various features
2321 * on an association. The flag field may contain
2322 * zero or more of the following options.
2323 *
2324 * SPP_HB_ENABLE - Enable heartbeats on the
2325 * specified address. Note that if the address
2326 * field is empty all addresses for the association
2327 * have heartbeats enabled upon them.
2328 *
2329 * SPP_HB_DISABLE - Disable heartbeats on the
2330 * speicifed address. Note that if the address
2331 * field is empty all addresses for the association
2332 * will have their heartbeats disabled. Note also
2333 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2334 * mutually exclusive, only one of these two should
2335 * be specified. Enabling both fields will have
2336 * undetermined results.
2337 *
2338 * SPP_HB_DEMAND - Request a user initiated heartbeat
2339 * to be made immediately.
2340 *
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002341 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2342 * heartbeat delayis to be set to the value of 0
2343 * milliseconds.
2344 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08002345 * SPP_PMTUD_ENABLE - This field will enable PMTU
2346 * discovery upon the specified address. Note that
2347 * if the address feild is empty then all addresses
2348 * on the association are effected.
2349 *
2350 * SPP_PMTUD_DISABLE - This field will disable PMTU
2351 * discovery upon the specified address. Note that
2352 * if the address feild is empty then all addresses
2353 * on the association are effected. Not also that
2354 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2355 * exclusive. Enabling both will have undetermined
2356 * results.
2357 *
2358 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2359 * on delayed sack. The time specified in spp_sackdelay
2360 * is used to specify the sack delay for this address. Note
2361 * that if spp_address is empty then all addresses will
2362 * enable delayed sack and take on the sack delay
2363 * value specified in spp_sackdelay.
2364 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2365 * off delayed sack. If the spp_address field is blank then
2366 * delayed sack is disabled for the entire association. Note
2367 * also that this field is mutually exclusive to
2368 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2369 * results.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002370 */
Adrian Bunk16164362006-09-18 00:40:38 -07002371static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2372 struct sctp_transport *trans,
2373 struct sctp_association *asoc,
2374 struct sctp_sock *sp,
2375 int hb_change,
2376 int pmtud_change,
2377 int sackdelay_change)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002378{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002379 int error;
2380
Frank Filz52ccb8e2005-12-22 11:36:46 -08002381 if (params->spp_flags & SPP_HB_DEMAND && trans) {
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00002382 struct net *net = sock_net(trans->asoc->base.sk);
2383
2384 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002385 if (error)
2386 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002387 }
2388
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002389 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2390 * this field is ignored. Note also that a value of zero indicates
2391 * the current setting should be left unchanged.
2392 */
2393 if (params->spp_flags & SPP_HB_ENABLE) {
2394
2395 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2396 * set. This lets us use 0 value when this flag
2397 * is set.
2398 */
2399 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2400 params->spp_hbinterval = 0;
2401
2402 if (params->spp_hbinterval ||
2403 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2404 if (trans) {
2405 trans->hbinterval =
2406 msecs_to_jiffies(params->spp_hbinterval);
2407 } else if (asoc) {
2408 asoc->hbinterval =
2409 msecs_to_jiffies(params->spp_hbinterval);
2410 } else {
2411 sp->hbinterval = params->spp_hbinterval;
2412 }
Frank Filz52ccb8e2005-12-22 11:36:46 -08002413 }
2414 }
2415
2416 if (hb_change) {
2417 if (trans) {
2418 trans->param_flags =
2419 (trans->param_flags & ~SPP_HB) | hb_change;
2420 } else if (asoc) {
2421 asoc->param_flags =
2422 (asoc->param_flags & ~SPP_HB) | hb_change;
2423 } else {
2424 sp->param_flags =
2425 (sp->param_flags & ~SPP_HB) | hb_change;
2426 }
2427 }
2428
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002429 /* When Path MTU discovery is disabled the value specified here will
2430 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2431 * include the flag SPP_PMTUD_DISABLE for this field to have any
2432 * effect).
2433 */
2434 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002435 if (trans) {
2436 trans->pathmtu = params->spp_pathmtu;
David S. Miller02f3d4c2012-07-16 03:57:14 -07002437 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
Frank Filz52ccb8e2005-12-22 11:36:46 -08002438 } else if (asoc) {
2439 asoc->pathmtu = params->spp_pathmtu;
Frank Filz52ccb8e2005-12-22 11:36:46 -08002440 } else {
2441 sp->pathmtu = params->spp_pathmtu;
2442 }
2443 }
2444
2445 if (pmtud_change) {
2446 if (trans) {
2447 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2448 (params->spp_flags & SPP_PMTUD_ENABLE);
2449 trans->param_flags =
2450 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2451 if (update) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +00002452 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
David S. Miller02f3d4c2012-07-16 03:57:14 -07002453 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
Frank Filz52ccb8e2005-12-22 11:36:46 -08002454 }
2455 } else if (asoc) {
2456 asoc->param_flags =
2457 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2458 } else {
2459 sp->param_flags =
2460 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2461 }
2462 }
2463
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002464 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2465 * value of this field is ignored. Note also that a value of zero
2466 * indicates the current setting should be left unchanged.
2467 */
2468 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002469 if (trans) {
2470 trans->sackdelay =
2471 msecs_to_jiffies(params->spp_sackdelay);
2472 } else if (asoc) {
2473 asoc->sackdelay =
2474 msecs_to_jiffies(params->spp_sackdelay);
2475 } else {
2476 sp->sackdelay = params->spp_sackdelay;
2477 }
2478 }
2479
2480 if (sackdelay_change) {
2481 if (trans) {
2482 trans->param_flags =
2483 (trans->param_flags & ~SPP_SACKDELAY) |
2484 sackdelay_change;
2485 } else if (asoc) {
2486 asoc->param_flags =
2487 (asoc->param_flags & ~SPP_SACKDELAY) |
2488 sackdelay_change;
2489 } else {
2490 sp->param_flags =
2491 (sp->param_flags & ~SPP_SACKDELAY) |
2492 sackdelay_change;
2493 }
2494 }
2495
Andrei Pelinescu-Onciul37051f72009-11-23 15:53:57 -05002496 /* Note that a value of zero indicates the current setting should be
2497 left unchanged.
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002498 */
Andrei Pelinescu-Onciul37051f72009-11-23 15:53:57 -05002499 if (params->spp_pathmaxrxt) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002500 if (trans) {
2501 trans->pathmaxrxt = params->spp_pathmaxrxt;
2502 } else if (asoc) {
2503 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2504 } else {
2505 sp->pathmaxrxt = params->spp_pathmaxrxt;
2506 }
2507 }
2508
2509 return 0;
2510}
2511
2512static int sctp_setsockopt_peer_addr_params(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002513 char __user *optval,
2514 unsigned int optlen)
Frank Filz52ccb8e2005-12-22 11:36:46 -08002515{
2516 struct sctp_paddrparams params;
2517 struct sctp_transport *trans = NULL;
2518 struct sctp_association *asoc = NULL;
2519 struct sctp_sock *sp = sctp_sk(sk);
2520 int error;
2521 int hb_change, pmtud_change, sackdelay_change;
2522
2523 if (optlen != sizeof(struct sctp_paddrparams))
wangweidongcb3f8372013-12-23 12:16:50 +08002524 return -EINVAL;
Frank Filz52ccb8e2005-12-22 11:36:46 -08002525
2526 if (copy_from_user(&params, optval, optlen))
2527 return -EFAULT;
2528
2529 /* Validate flags and value parameters. */
2530 hb_change = params.spp_flags & SPP_HB;
2531 pmtud_change = params.spp_flags & SPP_PMTUD;
2532 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2533
2534 if (hb_change == SPP_HB ||
2535 pmtud_change == SPP_PMTUD ||
2536 sackdelay_change == SPP_SACKDELAY ||
2537 params.spp_sackdelay > 500 ||
Joe Perchesf64f9e72009-11-29 16:55:45 -08002538 (params.spp_pathmtu &&
2539 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
Frank Filz52ccb8e2005-12-22 11:36:46 -08002540 return -EINVAL;
2541
2542 /* If an address other than INADDR_ANY is specified, and
2543 * no transport is found, then the request is invalid.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002544 */
wangweidongcb3f8372013-12-23 12:16:50 +08002545 if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002546 trans = sctp_addr_id2transport(sk, &params.spp_address,
2547 params.spp_assoc_id);
2548 if (!trans)
2549 return -EINVAL;
2550 }
2551
2552 /* Get association, if assoc_id != 0 and the socket is a one
2553 * to many style socket, and an association was not found, then
2554 * the id was invalid.
2555 */
2556 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2557 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2558 return -EINVAL;
2559
2560 /* Heartbeat demand can only be sent on a transport or
2561 * association, but not a socket.
2562 */
2563 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2564 return -EINVAL;
2565
2566 /* Process parameters. */
2567 error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2568 hb_change, pmtud_change,
2569 sackdelay_change);
2570
2571 if (error)
2572 return error;
2573
2574 /* If changes are for association, also apply parameters to each
2575 * transport.
2576 */
2577 if (!trans && asoc) {
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002578 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2579 transports) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002580 sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2581 hb_change, pmtud_change,
2582 sackdelay_change);
2583 }
2584 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002585
2586 return 0;
2587}
2588
wangweidong0ea5e4d2014-01-15 17:24:01 +08002589static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2590{
2591 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2592}
2593
2594static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2595{
2596 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2597}
2598
Wei Yongjund364d922008-05-09 15:13:26 -07002599/*
2600 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
Frank Filz77086102005-12-22 11:37:30 -08002601 *
Wei Yongjund364d922008-05-09 15:13:26 -07002602 * This option will effect the way delayed acks are performed. This
2603 * option allows you to get or set the delayed ack time, in
2604 * milliseconds. It also allows changing the delayed ack frequency.
2605 * Changing the frequency to 1 disables the delayed sack algorithm. If
2606 * the assoc_id is 0, then this sets or gets the endpoints default
2607 * values. If the assoc_id field is non-zero, then the set or get
2608 * effects the specified association for the one to many model (the
2609 * assoc_id field is ignored by the one to one model). Note that if
2610 * sack_delay or sack_freq are 0 when setting this option, then the
2611 * current values will remain unchanged.
Frank Filz77086102005-12-22 11:37:30 -08002612 *
Wei Yongjund364d922008-05-09 15:13:26 -07002613 * struct sctp_sack_info {
2614 * sctp_assoc_t sack_assoc_id;
2615 * uint32_t sack_delay;
2616 * uint32_t sack_freq;
2617 * };
Frank Filz77086102005-12-22 11:37:30 -08002618 *
Wei Yongjund364d922008-05-09 15:13:26 -07002619 * sack_assoc_id - This parameter, indicates which association the user
2620 * is performing an action upon. Note that if this field's value is
2621 * zero then the endpoints default value is changed (effecting future
2622 * associations only).
Frank Filz77086102005-12-22 11:37:30 -08002623 *
Wei Yongjund364d922008-05-09 15:13:26 -07002624 * sack_delay - This parameter contains the number of milliseconds that
2625 * the user is requesting the delayed ACK timer be set to. Note that
2626 * this value is defined in the standard to be between 200 and 500
2627 * milliseconds.
Frank Filz77086102005-12-22 11:37:30 -08002628 *
Wei Yongjund364d922008-05-09 15:13:26 -07002629 * sack_freq - This parameter contains the number of packets that must
2630 * be received before a sack is sent without waiting for the delay
2631 * timer to expire. The default value for this is 2, setting this
2632 * value to 1 will disable the delayed sack algorithm.
Frank Filz77086102005-12-22 11:37:30 -08002633 */
2634
Wei Yongjund364d922008-05-09 15:13:26 -07002635static int sctp_setsockopt_delayed_ack(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002636 char __user *optval, unsigned int optlen)
Frank Filz77086102005-12-22 11:37:30 -08002637{
Wei Yongjund364d922008-05-09 15:13:26 -07002638 struct sctp_sack_info params;
Frank Filz77086102005-12-22 11:37:30 -08002639 struct sctp_transport *trans = NULL;
2640 struct sctp_association *asoc = NULL;
2641 struct sctp_sock *sp = sctp_sk(sk);
2642
Wei Yongjund364d922008-05-09 15:13:26 -07002643 if (optlen == sizeof(struct sctp_sack_info)) {
2644 if (copy_from_user(&params, optval, optlen))
2645 return -EFAULT;
2646
2647 if (params.sack_delay == 0 && params.sack_freq == 0)
2648 return 0;
2649 } else if (optlen == sizeof(struct sctp_assoc_value)) {
Neil Horman94f65192013-12-23 08:29:43 -05002650 pr_warn_ratelimited(DEPRECATED
Neil Hormanf916ec92014-01-02 12:54:27 -05002651 "%s (pid %d) "
Neil Horman94f65192013-12-23 08:29:43 -05002652 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
Neil Hormanf916ec92014-01-02 12:54:27 -05002653 "Use struct sctp_sack_info instead\n",
2654 current->comm, task_pid_nr(current));
Wei Yongjund364d922008-05-09 15:13:26 -07002655 if (copy_from_user(&params, optval, optlen))
2656 return -EFAULT;
2657
2658 if (params.sack_delay == 0)
2659 params.sack_freq = 1;
2660 else
2661 params.sack_freq = 0;
2662 } else
wangweidongcb3f8372013-12-23 12:16:50 +08002663 return -EINVAL;
Frank Filz77086102005-12-22 11:37:30 -08002664
Frank Filz77086102005-12-22 11:37:30 -08002665 /* Validate value parameter. */
Wei Yongjund364d922008-05-09 15:13:26 -07002666 if (params.sack_delay > 500)
Frank Filz77086102005-12-22 11:37:30 -08002667 return -EINVAL;
2668
Wei Yongjund364d922008-05-09 15:13:26 -07002669 /* Get association, if sack_assoc_id != 0 and the socket is a one
Frank Filz77086102005-12-22 11:37:30 -08002670 * to many style socket, and an association was not found, then
2671 * the id was invalid.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002672 */
Wei Yongjund364d922008-05-09 15:13:26 -07002673 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2674 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
Frank Filz77086102005-12-22 11:37:30 -08002675 return -EINVAL;
2676
Wei Yongjund364d922008-05-09 15:13:26 -07002677 if (params.sack_delay) {
Frank Filz77086102005-12-22 11:37:30 -08002678 if (asoc) {
2679 asoc->sackdelay =
Wei Yongjund364d922008-05-09 15:13:26 -07002680 msecs_to_jiffies(params.sack_delay);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002681 asoc->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002682 sctp_spp_sackdelay_enable(asoc->param_flags);
Frank Filz77086102005-12-22 11:37:30 -08002683 } else {
Wei Yongjund364d922008-05-09 15:13:26 -07002684 sp->sackdelay = params.sack_delay;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002685 sp->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002686 sctp_spp_sackdelay_enable(sp->param_flags);
Frank Filz77086102005-12-22 11:37:30 -08002687 }
Wei Yongjund364d922008-05-09 15:13:26 -07002688 }
2689
2690 if (params.sack_freq == 1) {
Frank Filz77086102005-12-22 11:37:30 -08002691 if (asoc) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002692 asoc->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002693 sctp_spp_sackdelay_disable(asoc->param_flags);
Frank Filz77086102005-12-22 11:37:30 -08002694 } else {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002695 sp->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002696 sctp_spp_sackdelay_disable(sp->param_flags);
Frank Filz77086102005-12-22 11:37:30 -08002697 }
Wei Yongjund364d922008-05-09 15:13:26 -07002698 } else if (params.sack_freq > 1) {
2699 if (asoc) {
2700 asoc->sackfreq = params.sack_freq;
2701 asoc->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002702 sctp_spp_sackdelay_enable(asoc->param_flags);
Wei Yongjund364d922008-05-09 15:13:26 -07002703 } else {
2704 sp->sackfreq = params.sack_freq;
2705 sp->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002706 sctp_spp_sackdelay_enable(sp->param_flags);
Wei Yongjund364d922008-05-09 15:13:26 -07002707 }
Frank Filz77086102005-12-22 11:37:30 -08002708 }
2709
2710 /* If change is for association, also apply to each transport. */
2711 if (asoc) {
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002712 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2713 transports) {
Wei Yongjund364d922008-05-09 15:13:26 -07002714 if (params.sack_delay) {
Frank Filz77086102005-12-22 11:37:30 -08002715 trans->sackdelay =
Wei Yongjund364d922008-05-09 15:13:26 -07002716 msecs_to_jiffies(params.sack_delay);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002717 trans->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002718 sctp_spp_sackdelay_enable(trans->param_flags);
Wei Yongjund364d922008-05-09 15:13:26 -07002719 }
Vlad Yasevich7bfe8bdb2008-06-09 15:45:05 -07002720 if (params.sack_freq == 1) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002721 trans->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002722 sctp_spp_sackdelay_disable(trans->param_flags);
Wei Yongjund364d922008-05-09 15:13:26 -07002723 } else if (params.sack_freq > 1) {
2724 trans->sackfreq = params.sack_freq;
2725 trans->param_flags =
wangweidong0ea5e4d2014-01-15 17:24:01 +08002726 sctp_spp_sackdelay_enable(trans->param_flags);
Frank Filz77086102005-12-22 11:37:30 -08002727 }
2728 }
2729 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002730
Frank Filz77086102005-12-22 11:37:30 -08002731 return 0;
2732}
2733
Linus Torvalds1da177e2005-04-16 15:20:36 -07002734/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2735 *
2736 * Applications can specify protocol parameters for the default association
2737 * initialization. The option name argument to setsockopt() and getsockopt()
2738 * is SCTP_INITMSG.
2739 *
2740 * Setting initialization parameters is effective only on an unconnected
2741 * socket (for UDP-style sockets only future associations are effected
2742 * by the change). With TCP-style sockets, this option is inherited by
2743 * sockets derived from a listener socket.
2744 */
David S. Millerb7058842009-09-30 16:12:20 -07002745static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002746{
2747 struct sctp_initmsg sinit;
2748 struct sctp_sock *sp = sctp_sk(sk);
2749
2750 if (optlen != sizeof(struct sctp_initmsg))
2751 return -EINVAL;
2752 if (copy_from_user(&sinit, optval, optlen))
2753 return -EFAULT;
2754
2755 if (sinit.sinit_num_ostreams)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002756 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002757 if (sinit.sinit_max_instreams)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002758 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002759 if (sinit.sinit_max_attempts)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002760 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002761 if (sinit.sinit_max_init_timeo)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002762 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002763
2764 return 0;
2765}
2766
2767/*
2768 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2769 *
2770 * Applications that wish to use the sendto() system call may wish to
2771 * specify a default set of parameters that would normally be supplied
2772 * through the inclusion of ancillary data. This socket option allows
2773 * such an application to set the default sctp_sndrcvinfo structure.
2774 * The application that wishes to use this socket option simply passes
2775 * in to this call the sctp_sndrcvinfo structure defined in Section
2776 * 5.2.2) The input parameters accepted by this call include
2777 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2778 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2779 * to this call if the caller is using the UDP model.
2780 */
2781static int sctp_setsockopt_default_send_param(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002782 char __user *optval,
2783 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002784{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002785 struct sctp_sock *sp = sctp_sk(sk);
Geir Ola Vaagland6b3fd5f2014-07-12 20:30:39 +02002786 struct sctp_association *asoc;
2787 struct sctp_sndrcvinfo info;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002788
Geir Ola Vaagland6b3fd5f2014-07-12 20:30:39 +02002789 if (optlen != sizeof(info))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002790 return -EINVAL;
2791 if (copy_from_user(&info, optval, optlen))
2792 return -EFAULT;
Geir Ola Vaagland6b3fd5f2014-07-12 20:30:39 +02002793 if (info.sinfo_flags &
2794 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2795 SCTP_ABORT | SCTP_EOF))
2796 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002797
2798 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2799 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2800 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002801 if (asoc) {
2802 asoc->default_stream = info.sinfo_stream;
2803 asoc->default_flags = info.sinfo_flags;
2804 asoc->default_ppid = info.sinfo_ppid;
2805 asoc->default_context = info.sinfo_context;
2806 asoc->default_timetolive = info.sinfo_timetolive;
2807 } else {
2808 sp->default_stream = info.sinfo_stream;
2809 sp->default_flags = info.sinfo_flags;
2810 sp->default_ppid = info.sinfo_ppid;
2811 sp->default_context = info.sinfo_context;
2812 sp->default_timetolive = info.sinfo_timetolive;
2813 }
2814
2815 return 0;
2816}
2817
Geir Ola Vaagland6b3fd5f2014-07-12 20:30:39 +02002818/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2819 * (SCTP_DEFAULT_SNDINFO)
2820 */
2821static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2822 char __user *optval,
2823 unsigned int optlen)
2824{
2825 struct sctp_sock *sp = sctp_sk(sk);
2826 struct sctp_association *asoc;
2827 struct sctp_sndinfo info;
2828
2829 if (optlen != sizeof(info))
2830 return -EINVAL;
2831 if (copy_from_user(&info, optval, optlen))
2832 return -EFAULT;
2833 if (info.snd_flags &
2834 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2835 SCTP_ABORT | SCTP_EOF))
2836 return -EINVAL;
2837
2838 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2839 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2840 return -EINVAL;
2841 if (asoc) {
2842 asoc->default_stream = info.snd_sid;
2843 asoc->default_flags = info.snd_flags;
2844 asoc->default_ppid = info.snd_ppid;
2845 asoc->default_context = info.snd_context;
2846 } else {
2847 sp->default_stream = info.snd_sid;
2848 sp->default_flags = info.snd_flags;
2849 sp->default_ppid = info.snd_ppid;
2850 sp->default_context = info.snd_context;
2851 }
2852
2853 return 0;
2854}
2855
Linus Torvalds1da177e2005-04-16 15:20:36 -07002856/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2857 *
2858 * Requests that the local SCTP stack use the enclosed peer address as
2859 * the association primary. The enclosed address must be one of the
2860 * association peer's addresses.
2861 */
2862static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002863 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002864{
2865 struct sctp_prim prim;
2866 struct sctp_transport *trans;
2867
2868 if (optlen != sizeof(struct sctp_prim))
2869 return -EINVAL;
2870
2871 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2872 return -EFAULT;
2873
2874 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2875 if (!trans)
2876 return -EINVAL;
2877
2878 sctp_assoc_set_primary(trans->asoc, trans);
2879
2880 return 0;
2881}
2882
2883/*
2884 * 7.1.5 SCTP_NODELAY
2885 *
2886 * Turn on/off any Nagle-like algorithm. This means that packets are
2887 * generally sent as soon as possible and no unnecessary delays are
2888 * introduced, at the cost of more packets in the network. Expects an
2889 * integer boolean flag.
2890 */
2891static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002892 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002893{
2894 int val;
2895
2896 if (optlen < sizeof(int))
2897 return -EINVAL;
2898 if (get_user(val, (int __user *)optval))
2899 return -EFAULT;
2900
2901 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2902 return 0;
2903}
2904
2905/*
2906 *
2907 * 7.1.1 SCTP_RTOINFO
2908 *
2909 * The protocol parameters used to initialize and bound retransmission
2910 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2911 * and modify these parameters.
2912 * All parameters are time values, in milliseconds. A value of 0, when
2913 * modifying the parameters, indicates that the current value should not
2914 * be changed.
2915 *
2916 */
David S. Millerb7058842009-09-30 16:12:20 -07002917static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2918{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002919 struct sctp_rtoinfo rtoinfo;
2920 struct sctp_association *asoc;
wangweidong85f935d2013-12-11 09:50:38 +08002921 unsigned long rto_min, rto_max;
2922 struct sctp_sock *sp = sctp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002923
2924 if (optlen != sizeof (struct sctp_rtoinfo))
2925 return -EINVAL;
2926
2927 if (copy_from_user(&rtoinfo, optval, optlen))
2928 return -EFAULT;
2929
2930 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2931
2932 /* Set the values to the specific association */
2933 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2934 return -EINVAL;
2935
wangweidong85f935d2013-12-11 09:50:38 +08002936 rto_max = rtoinfo.srto_max;
2937 rto_min = rtoinfo.srto_min;
2938
2939 if (rto_max)
2940 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
2941 else
2942 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
2943
2944 if (rto_min)
2945 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
2946 else
2947 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
2948
2949 if (rto_min > rto_max)
2950 return -EINVAL;
2951
Linus Torvalds1da177e2005-04-16 15:20:36 -07002952 if (asoc) {
2953 if (rtoinfo.srto_initial != 0)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002954 asoc->rto_initial =
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955 msecs_to_jiffies(rtoinfo.srto_initial);
wangweidong85f935d2013-12-11 09:50:38 +08002956 asoc->rto_max = rto_max;
2957 asoc->rto_min = rto_min;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002958 } else {
2959 /* If there is no association or the association-id = 0
2960 * set the values to the endpoint.
2961 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002962 if (rtoinfo.srto_initial != 0)
2963 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
wangweidong85f935d2013-12-11 09:50:38 +08002964 sp->rtoinfo.srto_max = rto_max;
2965 sp->rtoinfo.srto_min = rto_min;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002966 }
2967
2968 return 0;
2969}
2970
2971/*
2972 *
2973 * 7.1.2 SCTP_ASSOCINFO
2974 *
Michael Opdenacker59c51592007-05-09 08:57:56 +02002975 * This option is used to tune the maximum retransmission attempts
Linus Torvalds1da177e2005-04-16 15:20:36 -07002976 * of the association.
2977 * Returns an error if the new association retransmission value is
2978 * greater than the sum of the retransmission value of the peer.
2979 * See [SCTP] for more information.
2980 *
2981 */
David S. Millerb7058842009-09-30 16:12:20 -07002982static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002983{
2984
2985 struct sctp_assocparams assocparams;
2986 struct sctp_association *asoc;
2987
2988 if (optlen != sizeof(struct sctp_assocparams))
2989 return -EINVAL;
2990 if (copy_from_user(&assocparams, optval, optlen))
2991 return -EFAULT;
2992
2993 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2994
2995 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2996 return -EINVAL;
2997
2998 /* Set the values to the specific association */
2999 if (asoc) {
Vlad Yasevich402d68c2006-06-17 22:54:51 -07003000 if (assocparams.sasoc_asocmaxrxt != 0) {
3001 __u32 path_sum = 0;
3002 int paths = 0;
Vlad Yasevich402d68c2006-06-17 22:54:51 -07003003 struct sctp_transport *peer_addr;
3004
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07003005 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3006 transports) {
Vlad Yasevich402d68c2006-06-17 22:54:51 -07003007 path_sum += peer_addr->pathmaxrxt;
3008 paths++;
3009 }
3010
Frederik Schwarzer025dfda2008-10-16 19:02:37 +02003011 /* Only validate asocmaxrxt if we have more than
Vlad Yasevich402d68c2006-06-17 22:54:51 -07003012 * one path/transport. We do this because path
3013 * retransmissions are only counted when we have more
3014 * then one path.
3015 */
3016 if (paths > 1 &&
3017 assocparams.sasoc_asocmaxrxt > path_sum)
3018 return -EINVAL;
3019
Linus Torvalds1da177e2005-04-16 15:20:36 -07003020 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
Vlad Yasevich402d68c2006-06-17 22:54:51 -07003021 }
3022
Daniel Borkmann52db8822013-06-25 18:17:27 +02003023 if (assocparams.sasoc_cookie_life != 0)
3024 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003025 } else {
3026 /* Set the values to the endpoint */
3027 struct sctp_sock *sp = sctp_sk(sk);
3028
3029 if (assocparams.sasoc_asocmaxrxt != 0)
3030 sp->assocparams.sasoc_asocmaxrxt =
3031 assocparams.sasoc_asocmaxrxt;
3032 if (assocparams.sasoc_cookie_life != 0)
3033 sp->assocparams.sasoc_cookie_life =
3034 assocparams.sasoc_cookie_life;
3035 }
3036 return 0;
3037}
3038
3039/*
3040 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3041 *
3042 * This socket option is a boolean flag which turns on or off mapped V4
3043 * addresses. If this option is turned on and the socket is type
3044 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3045 * If this option is turned off, then no mapping will be done of V4
3046 * addresses and a user will receive both PF_INET6 and PF_INET type
3047 * addresses on the socket.
3048 */
David S. Millerb7058842009-09-30 16:12:20 -07003049static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003050{
3051 int val;
3052 struct sctp_sock *sp = sctp_sk(sk);
3053
3054 if (optlen < sizeof(int))
3055 return -EINVAL;
3056 if (get_user(val, (int __user *)optval))
3057 return -EFAULT;
3058 if (val)
3059 sp->v4mapped = 1;
3060 else
3061 sp->v4mapped = 0;
3062
3063 return 0;
3064}
3065
3066/*
Wei Yongjune89c2092008-12-25 16:54:58 -08003067 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3068 * This option will get or set the maximum size to put in any outgoing
3069 * SCTP DATA chunk. If a message is larger than this size it will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07003070 * fragmented by SCTP into the specified size. Note that the underlying
3071 * SCTP implementation may fragment into smaller sized chunks when the
3072 * PMTU of the underlying association is smaller than the value set by
Wei Yongjune89c2092008-12-25 16:54:58 -08003073 * the user. The default value for this option is '0' which indicates
3074 * the user is NOT limiting fragmentation and only the PMTU will effect
3075 * SCTP's choice of DATA chunk size. Note also that values set larger
3076 * than the maximum size of an IP datagram will effectively let SCTP
3077 * control fragmentation (i.e. the same as setting this option to 0).
3078 *
3079 * The following structure is used to access and modify this parameter:
3080 *
3081 * struct sctp_assoc_value {
3082 * sctp_assoc_t assoc_id;
3083 * uint32_t assoc_value;
3084 * };
3085 *
3086 * assoc_id: This parameter is ignored for one-to-one style sockets.
3087 * For one-to-many style sockets this parameter indicates which
3088 * association the user is performing an action upon. Note that if
3089 * this field's value is zero then the endpoints default value is
3090 * changed (effecting future associations only).
3091 * assoc_value: This parameter specifies the maximum size in bytes.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003092 */
David S. Millerb7058842009-09-30 16:12:20 -07003093static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003094{
Wei Yongjune89c2092008-12-25 16:54:58 -08003095 struct sctp_assoc_value params;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003096 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003097 struct sctp_sock *sp = sctp_sk(sk);
3098 int val;
3099
Wei Yongjune89c2092008-12-25 16:54:58 -08003100 if (optlen == sizeof(int)) {
Neil Horman94f65192013-12-23 08:29:43 -05003101 pr_warn_ratelimited(DEPRECATED
Neil Hormanf916ec92014-01-02 12:54:27 -05003102 "%s (pid %d) "
Neil Horman94f65192013-12-23 08:29:43 -05003103 "Use of int in maxseg socket option.\n"
Neil Hormanf916ec92014-01-02 12:54:27 -05003104 "Use struct sctp_assoc_value instead\n",
3105 current->comm, task_pid_nr(current));
Wei Yongjune89c2092008-12-25 16:54:58 -08003106 if (copy_from_user(&val, optval, optlen))
3107 return -EFAULT;
3108 params.assoc_id = 0;
3109 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3110 if (copy_from_user(&params, optval, optlen))
3111 return -EFAULT;
3112 val = params.assoc_value;
3113 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07003114 return -EINVAL;
Wei Yongjune89c2092008-12-25 16:54:58 -08003115
Ivan Skytte Jorgensen96a33992005-10-28 15:36:12 -07003116 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003117 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003118
Wei Yongjune89c2092008-12-25 16:54:58 -08003119 asoc = sctp_id2assoc(sk, params.assoc_id);
3120 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3121 return -EINVAL;
3122
3123 if (asoc) {
3124 if (val == 0) {
3125 val = asoc->pathmtu;
3126 val -= sp->pf->af->net_header_len;
3127 val -= sizeof(struct sctphdr) +
3128 sizeof(struct sctp_data_chunk);
3129 }
Vlad Yasevichf68b2e02009-09-04 18:21:00 -04003130 asoc->user_frag = val;
3131 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
Wei Yongjune89c2092008-12-25 16:54:58 -08003132 } else {
3133 sp->user_frag = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003134 }
3135
3136 return 0;
3137}
3138
3139
3140/*
3141 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3142 *
3143 * Requests that the peer mark the enclosed address as the association
3144 * primary. The enclosed address must be one of the association's
3145 * locally bound addresses. The following structure is used to make a
3146 * set primary request:
3147 */
3148static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003149 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003150{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003151 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003152 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003153 struct sctp_association *asoc = NULL;
3154 struct sctp_setpeerprim prim;
3155 struct sctp_chunk *chunk;
Wei Yongjun40a01032010-12-07 17:11:09 +00003156 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003157 int err;
3158
3159 sp = sctp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003160
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003161 if (!net->sctp.addip_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003162 return -EPERM;
3163
3164 if (optlen != sizeof(struct sctp_setpeerprim))
3165 return -EINVAL;
3166
3167 if (copy_from_user(&prim, optval, optlen))
3168 return -EFAULT;
3169
3170 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003171 if (!asoc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003172 return -EINVAL;
3173
3174 if (!asoc->peer.asconf_capable)
3175 return -EPERM;
3176
3177 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3178 return -EPERM;
3179
3180 if (!sctp_state(asoc, ESTABLISHED))
3181 return -ENOTCONN;
3182
Wei Yongjun40a01032010-12-07 17:11:09 +00003183 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3184 if (!af)
3185 return -EINVAL;
3186
3187 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3188 return -EADDRNOTAVAIL;
3189
Linus Torvalds1da177e2005-04-16 15:20:36 -07003190 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3191 return -EADDRNOTAVAIL;
3192
3193 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3194 chunk = sctp_make_asconf_set_prim(asoc,
3195 (union sctp_addr *)&prim.sspp_addr);
3196 if (!chunk)
3197 return -ENOMEM;
3198
3199 err = sctp_send_asconf(asoc, chunk);
3200
Daniel Borkmannbb333812013-06-28 19:49:40 +02003201 pr_debug("%s: we set peer primary addr primitively\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003202
3203 return err;
3204}
3205
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003206static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003207 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003208{
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003209 struct sctp_setadaptation adaptation;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003210
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003211 if (optlen != sizeof(struct sctp_setadaptation))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003212 return -EINVAL;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003213 if (copy_from_user(&adaptation, optval, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003214 return -EFAULT;
3215
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003216 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003217
3218 return 0;
3219}
3220
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003221/*
3222 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3223 *
3224 * The context field in the sctp_sndrcvinfo structure is normally only
3225 * used when a failed message is retrieved holding the value that was
3226 * sent down on the actual send call. This option allows the setting of
3227 * a default context on an association basis that will be received on
3228 * reading messages from the peer. This is especially helpful in the
3229 * one-2-many model for an application to keep some reference to an
3230 * internal state machine that is processing messages on the
3231 * association. Note that the setting of this value only effects
3232 * received messages from the peer and does not effect the value that is
3233 * saved with outbound messages.
3234 */
3235static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003236 unsigned int optlen)
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003237{
3238 struct sctp_assoc_value params;
3239 struct sctp_sock *sp;
3240 struct sctp_association *asoc;
3241
3242 if (optlen != sizeof(struct sctp_assoc_value))
3243 return -EINVAL;
3244 if (copy_from_user(&params, optval, optlen))
3245 return -EFAULT;
3246
3247 sp = sctp_sk(sk);
3248
3249 if (params.assoc_id != 0) {
3250 asoc = sctp_id2assoc(sk, params.assoc_id);
3251 if (!asoc)
3252 return -EINVAL;
3253 asoc->default_rcv_context = params.assoc_value;
3254 } else {
3255 sp->default_rcv_context = params.assoc_value;
3256 }
3257
3258 return 0;
3259}
3260
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003261/*
3262 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3263 *
3264 * This options will at a minimum specify if the implementation is doing
3265 * fragmented interleave. Fragmented interleave, for a one to many
3266 * socket, is when subsequent calls to receive a message may return
3267 * parts of messages from different associations. Some implementations
3268 * may allow you to turn this value on or off. If so, when turned off,
3269 * no fragment interleave will occur (which will cause a head of line
3270 * blocking amongst multiple associations sharing the same one to many
3271 * socket). When this option is turned on, then each receive call may
3272 * come from a different association (thus the user must receive data
3273 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3274 * association each receive belongs to.
3275 *
3276 * This option takes a boolean value. A non-zero value indicates that
3277 * fragmented interleave is on. A value of zero indicates that
3278 * fragmented interleave is off.
3279 *
3280 * Note that it is important that an implementation that allows this
3281 * option to be turned on, have it off by default. Otherwise an unaware
3282 * application using the one to many model may become confused and act
3283 * incorrectly.
3284 */
3285static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3286 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003287 unsigned int optlen)
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003288{
3289 int val;
3290
3291 if (optlen != sizeof(int))
3292 return -EINVAL;
3293 if (get_user(val, (int __user *)optval))
3294 return -EFAULT;
3295
3296 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3297
3298 return 0;
3299}
3300
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003301/*
Wei Yongjun8510b932008-12-25 16:59:03 -08003302 * 8.1.21. Set or Get the SCTP Partial Delivery Point
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003303 * (SCTP_PARTIAL_DELIVERY_POINT)
Wei Yongjun8510b932008-12-25 16:59:03 -08003304 *
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003305 * This option will set or get the SCTP partial delivery point. This
3306 * point is the size of a message where the partial delivery API will be
3307 * invoked to help free up rwnd space for the peer. Setting this to a
Wei Yongjun8510b932008-12-25 16:59:03 -08003308 * lower value will cause partial deliveries to happen more often. The
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003309 * calls argument is an integer that sets or gets the partial delivery
Wei Yongjun8510b932008-12-25 16:59:03 -08003310 * point. Note also that the call will fail if the user attempts to set
3311 * this value larger than the socket receive buffer size.
3312 *
3313 * Note that any single message having a length smaller than or equal to
3314 * the SCTP partial delivery point will be delivered in one single read
3315 * call as long as the user provided buffer is large enough to hold the
3316 * message.
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003317 */
3318static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3319 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003320 unsigned int optlen)
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003321{
3322 u32 val;
3323
3324 if (optlen != sizeof(u32))
3325 return -EINVAL;
3326 if (get_user(val, (int __user *)optval))
3327 return -EFAULT;
3328
Wei Yongjun8510b932008-12-25 16:59:03 -08003329 /* Note: We double the receive buffer from what the user sets
3330 * it to be, also initial rwnd is based on rcvbuf/2.
3331 */
3332 if (val > (sk->sk_rcvbuf >> 1))
3333 return -EINVAL;
3334
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003335 sctp_sk(sk)->pd_point = val;
3336
3337 return 0; /* is this the right error code? */
3338}
3339
Vlad Yasevich70331572007-03-23 11:34:36 -07003340/*
3341 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3342 *
3343 * This option will allow a user to change the maximum burst of packets
3344 * that can be emitted by this association. Note that the default value
3345 * is 4, and some implementations may restrict this setting so that it
3346 * can only be lowered.
3347 *
3348 * NOTE: This text doesn't seem right. Do this on a socket basis with
3349 * future associations inheriting the socket value.
3350 */
3351static int sctp_setsockopt_maxburst(struct sock *sk,
3352 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003353 unsigned int optlen)
Vlad Yasevich70331572007-03-23 11:34:36 -07003354{
Neil Horman219b99a2008-03-05 13:44:46 -08003355 struct sctp_assoc_value params;
3356 struct sctp_sock *sp;
3357 struct sctp_association *asoc;
Vlad Yasevich70331572007-03-23 11:34:36 -07003358 int val;
Neil Horman219b99a2008-03-05 13:44:46 -08003359 int assoc_id = 0;
Vlad Yasevich70331572007-03-23 11:34:36 -07003360
Neil Horman219b99a2008-03-05 13:44:46 -08003361 if (optlen == sizeof(int)) {
Neil Horman94f65192013-12-23 08:29:43 -05003362 pr_warn_ratelimited(DEPRECATED
Neil Hormanf916ec92014-01-02 12:54:27 -05003363 "%s (pid %d) "
Neil Horman94f65192013-12-23 08:29:43 -05003364 "Use of int in max_burst socket option deprecated.\n"
Neil Hormanf916ec92014-01-02 12:54:27 -05003365 "Use struct sctp_assoc_value instead\n",
3366 current->comm, task_pid_nr(current));
Neil Horman219b99a2008-03-05 13:44:46 -08003367 if (copy_from_user(&val, optval, optlen))
3368 return -EFAULT;
3369 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3370 if (copy_from_user(&params, optval, optlen))
3371 return -EFAULT;
3372 val = params.assoc_value;
3373 assoc_id = params.assoc_id;
3374 } else
3375 return -EINVAL;
3376
3377 sp = sctp_sk(sk);
3378
3379 if (assoc_id != 0) {
3380 asoc = sctp_id2assoc(sk, assoc_id);
3381 if (!asoc)
3382 return -EINVAL;
3383 asoc->max_burst = val;
3384 } else
3385 sp->max_burst = val;
Vlad Yasevich70331572007-03-23 11:34:36 -07003386
3387 return 0;
3388}
3389
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003390/*
3391 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3392 *
3393 * This set option adds a chunk type that the user is requesting to be
3394 * received only in an authenticated way. Changes to the list of chunks
3395 * will only effect future associations on the socket.
3396 */
3397static int sctp_setsockopt_auth_chunk(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003398 char __user *optval,
3399 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003400{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003401 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003402 struct sctp_authchunk val;
3403
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003404 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003405 return -EACCES;
3406
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003407 if (optlen != sizeof(struct sctp_authchunk))
3408 return -EINVAL;
3409 if (copy_from_user(&val, optval, optlen))
3410 return -EFAULT;
3411
3412 switch (val.sauth_chunk) {
Joe Perches7fd71b12011-07-01 09:43:11 +00003413 case SCTP_CID_INIT:
3414 case SCTP_CID_INIT_ACK:
3415 case SCTP_CID_SHUTDOWN_COMPLETE:
3416 case SCTP_CID_AUTH:
3417 return -EINVAL;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003418 }
3419
3420 /* add this chunk id to the endpoint */
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003421 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003422}
3423
3424/*
3425 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3426 *
3427 * This option gets or sets the list of HMAC algorithms that the local
3428 * endpoint requires the peer to use.
3429 */
3430static int sctp_setsockopt_hmac_ident(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003431 char __user *optval,
3432 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003433{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003434 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003435 struct sctp_hmacalgo *hmacs;
Vlad Yasevichd9724052008-08-27 16:09:49 -07003436 u32 idents;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003437 int err;
3438
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003439 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003440 return -EACCES;
3441
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003442 if (optlen < sizeof(struct sctp_hmacalgo))
3443 return -EINVAL;
3444
wangweidongcb3f8372013-12-23 12:16:50 +08003445 hmacs = memdup_user(optval, optlen);
Shan Wei934253a2011-04-18 19:13:18 +00003446 if (IS_ERR(hmacs))
3447 return PTR_ERR(hmacs);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003448
Vlad Yasevichd9724052008-08-27 16:09:49 -07003449 idents = hmacs->shmac_num_idents;
3450 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3451 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003452 err = -EINVAL;
3453 goto out;
3454 }
3455
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003456 err = sctp_auth_ep_set_hmacs(ep, hmacs);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003457out:
3458 kfree(hmacs);
3459 return err;
3460}
3461
3462/*
3463 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3464 *
3465 * This option will set a shared secret key which is used to build an
3466 * association shared key.
3467 */
3468static int sctp_setsockopt_auth_key(struct sock *sk,
3469 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003470 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003471{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003472 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003473 struct sctp_authkey *authkey;
3474 struct sctp_association *asoc;
3475 int ret;
3476
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003477 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003478 return -EACCES;
3479
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003480 if (optlen <= sizeof(struct sctp_authkey))
3481 return -EINVAL;
3482
wangweidongcb3f8372013-12-23 12:16:50 +08003483 authkey = memdup_user(optval, optlen);
Shan Wei934253a2011-04-18 19:13:18 +00003484 if (IS_ERR(authkey))
3485 return PTR_ERR(authkey);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003486
Vlad Yasevich328fc472008-08-27 16:08:54 -07003487 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
Vlad Yasevich30c22352008-08-25 15:16:19 -07003488 ret = -EINVAL;
3489 goto out;
3490 }
3491
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003492 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3493 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3494 ret = -EINVAL;
3495 goto out;
3496 }
3497
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003498 ret = sctp_auth_set_key(ep, asoc, authkey);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003499out:
Daniel Borkmann6ba542a2013-02-08 03:04:34 +00003500 kzfree(authkey);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003501 return ret;
3502}
3503
3504/*
3505 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3506 *
3507 * This option will get or set the active shared key to be used to build
3508 * the association shared key.
3509 */
3510static int sctp_setsockopt_active_key(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003511 char __user *optval,
3512 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003513{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003514 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003515 struct sctp_authkeyid val;
3516 struct sctp_association *asoc;
3517
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003518 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003519 return -EACCES;
3520
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003521 if (optlen != sizeof(struct sctp_authkeyid))
3522 return -EINVAL;
3523 if (copy_from_user(&val, optval, optlen))
3524 return -EFAULT;
3525
3526 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3527 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3528 return -EINVAL;
3529
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003530 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003531}
3532
3533/*
3534 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3535 *
3536 * This set option will delete a shared secret key from use.
3537 */
3538static int sctp_setsockopt_del_key(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003539 char __user *optval,
3540 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003541{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003542 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003543 struct sctp_authkeyid val;
3544 struct sctp_association *asoc;
3545
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003546 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003547 return -EACCES;
3548
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003549 if (optlen != sizeof(struct sctp_authkeyid))
3550 return -EINVAL;
3551 if (copy_from_user(&val, optval, optlen))
3552 return -EFAULT;
3553
3554 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3555 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3556 return -EINVAL;
3557
Vlad Yasevichb14878c2014-04-17 17:26:50 +02003558 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003559
3560}
3561
Michio Honda7dc04d72011-04-26 20:16:31 +09003562/*
3563 * 8.1.23 SCTP_AUTO_ASCONF
3564 *
3565 * This option will enable or disable the use of the automatic generation of
3566 * ASCONF chunks to add and delete addresses to an existing association. Note
3567 * that this option has two caveats namely: a) it only affects sockets that
3568 * are bound to all addresses available to the SCTP stack, and b) the system
3569 * administrator may have an overriding control that turns the ASCONF feature
3570 * off no matter what setting the socket option may have.
3571 * This option expects an integer boolean flag, where a non-zero value turns on
3572 * the option, and a zero value turns off the option.
3573 * Note. In this implementation, socket operation overrides default parameter
3574 * being set by sysctl as well as FreeBSD implementation
3575 */
3576static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3577 unsigned int optlen)
3578{
3579 int val;
3580 struct sctp_sock *sp = sctp_sk(sk);
3581
3582 if (optlen < sizeof(int))
3583 return -EINVAL;
3584 if (get_user(val, (int __user *)optval))
3585 return -EFAULT;
3586 if (!sctp_is_ep_boundall(sk) && val)
3587 return -EINVAL;
3588 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3589 return 0;
3590
Marcelo Ricardo Leitner2d45a022015-06-12 10:16:41 -03003591 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
Michio Honda7dc04d72011-04-26 20:16:31 +09003592 if (val == 0 && sp->do_auto_asconf) {
3593 list_del(&sp->auto_asconf_list);
3594 sp->do_auto_asconf = 0;
3595 } else if (val && !sp->do_auto_asconf) {
3596 list_add_tail(&sp->auto_asconf_list,
Eric W. Biederman4db67e82012-08-06 08:42:04 +00003597 &sock_net(sk)->sctp.auto_asconf_splist);
Michio Honda7dc04d72011-04-26 20:16:31 +09003598 sp->do_auto_asconf = 1;
3599 }
Marcelo Ricardo Leitner2d45a022015-06-12 10:16:41 -03003600 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
Michio Honda7dc04d72011-04-26 20:16:31 +09003601 return 0;
3602}
3603
Neil Horman5aa93bc2012-07-21 07:56:07 +00003604/*
3605 * SCTP_PEER_ADDR_THLDS
3606 *
3607 * This option allows us to alter the partially failed threshold for one or all
3608 * transports in an association. See Section 6.1 of:
3609 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3610 */
3611static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3612 char __user *optval,
3613 unsigned int optlen)
3614{
3615 struct sctp_paddrthlds val;
3616 struct sctp_transport *trans;
3617 struct sctp_association *asoc;
3618
3619 if (optlen < sizeof(struct sctp_paddrthlds))
3620 return -EINVAL;
3621 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3622 sizeof(struct sctp_paddrthlds)))
3623 return -EFAULT;
3624
3625
3626 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3627 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3628 if (!asoc)
3629 return -ENOENT;
3630 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3631 transports) {
3632 if (val.spt_pathmaxrxt)
3633 trans->pathmaxrxt = val.spt_pathmaxrxt;
3634 trans->pf_retrans = val.spt_pathpfthld;
3635 }
3636
3637 if (val.spt_pathmaxrxt)
3638 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3639 asoc->pf_retrans = val.spt_pathpfthld;
3640 } else {
3641 trans = sctp_addr_id2transport(sk, &val.spt_address,
3642 val.spt_assoc_id);
3643 if (!trans)
3644 return -ENOENT;
3645
3646 if (val.spt_pathmaxrxt)
3647 trans->pathmaxrxt = val.spt_pathmaxrxt;
3648 trans->pf_retrans = val.spt_pathpfthld;
3649 }
3650
3651 return 0;
3652}
3653
Geir Ola Vaagland0d3a4212014-07-12 20:30:37 +02003654static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3655 char __user *optval,
3656 unsigned int optlen)
3657{
3658 int val;
3659
3660 if (optlen < sizeof(int))
3661 return -EINVAL;
3662 if (get_user(val, (int __user *) optval))
3663 return -EFAULT;
3664
3665 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3666
3667 return 0;
3668}
3669
Geir Ola Vaagland2347c802014-07-12 20:30:38 +02003670static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3671 char __user *optval,
3672 unsigned int optlen)
3673{
3674 int val;
3675
3676 if (optlen < sizeof(int))
3677 return -EINVAL;
3678 if (get_user(val, (int __user *) optval))
3679 return -EFAULT;
3680
3681 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3682
3683 return 0;
3684}
3685
Xin Long28aa4c22016-07-09 19:47:40 +08003686static int sctp_setsockopt_pr_supported(struct sock *sk,
3687 char __user *optval,
3688 unsigned int optlen)
3689{
3690 struct sctp_assoc_value params;
3691 struct sctp_association *asoc;
3692 int retval = -EINVAL;
3693
3694 if (optlen != sizeof(params))
3695 goto out;
3696
3697 if (copy_from_user(&params, optval, optlen)) {
3698 retval = -EFAULT;
3699 goto out;
3700 }
3701
3702 asoc = sctp_id2assoc(sk, params.assoc_id);
3703 if (asoc) {
3704 asoc->prsctp_enable = !!params.assoc_value;
3705 } else if (!params.assoc_id) {
3706 struct sctp_sock *sp = sctp_sk(sk);
3707
3708 sp->ep->prsctp_enable = !!params.assoc_value;
3709 } else {
3710 goto out;
3711 }
3712
3713 retval = 0;
3714
3715out:
3716 return retval;
3717}
3718
Xin Longf959fb42016-07-09 19:47:41 +08003719static int sctp_setsockopt_default_prinfo(struct sock *sk,
3720 char __user *optval,
3721 unsigned int optlen)
3722{
3723 struct sctp_default_prinfo info;
3724 struct sctp_association *asoc;
3725 int retval = -EINVAL;
3726
3727 if (optlen != sizeof(info))
3728 goto out;
3729
3730 if (copy_from_user(&info, optval, sizeof(info))) {
3731 retval = -EFAULT;
3732 goto out;
3733 }
3734
3735 if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
3736 goto out;
3737
3738 if (info.pr_policy == SCTP_PR_SCTP_NONE)
3739 info.pr_value = 0;
3740
3741 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
3742 if (asoc) {
3743 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
3744 asoc->default_timetolive = info.pr_value;
3745 } else if (!info.pr_assoc_id) {
3746 struct sctp_sock *sp = sctp_sk(sk);
3747
3748 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
3749 sp->default_timetolive = info.pr_value;
3750 } else {
3751 goto out;
3752 }
3753
3754 retval = 0;
3755
3756out:
3757 return retval;
3758}
3759
Xin Long9fb657a2017-01-18 00:44:46 +08003760static int sctp_setsockopt_enable_strreset(struct sock *sk,
3761 char __user *optval,
3762 unsigned int optlen)
3763{
3764 struct sctp_assoc_value params;
3765 struct sctp_association *asoc;
3766 int retval = -EINVAL;
3767
3768 if (optlen != sizeof(params))
3769 goto out;
3770
3771 if (copy_from_user(&params, optval, optlen)) {
3772 retval = -EFAULT;
3773 goto out;
3774 }
3775
3776 if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
3777 goto out;
3778
3779 asoc = sctp_id2assoc(sk, params.assoc_id);
3780 if (asoc) {
3781 asoc->strreset_enable = params.assoc_value;
3782 } else if (!params.assoc_id) {
3783 struct sctp_sock *sp = sctp_sk(sk);
3784
3785 sp->ep->strreset_enable = params.assoc_value;
3786 } else {
3787 goto out;
3788 }
3789
3790 retval = 0;
3791
3792out:
3793 return retval;
3794}
3795
Xin Long7f9d68a2017-01-18 00:44:47 +08003796static int sctp_setsockopt_reset_streams(struct sock *sk,
3797 char __user *optval,
3798 unsigned int optlen)
3799{
3800 struct sctp_reset_streams *params;
3801 struct sctp_association *asoc;
3802 int retval = -EINVAL;
3803
3804 if (optlen < sizeof(struct sctp_reset_streams))
3805 return -EINVAL;
3806
3807 params = memdup_user(optval, optlen);
3808 if (IS_ERR(params))
3809 return PTR_ERR(params);
3810
3811 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
3812 if (!asoc)
3813 goto out;
3814
3815 retval = sctp_send_reset_streams(asoc, params);
3816
3817out:
3818 kfree(params);
3819 return retval;
3820}
3821
Xin Longa92ce1a2017-02-09 01:18:18 +08003822static int sctp_setsockopt_reset_assoc(struct sock *sk,
3823 char __user *optval,
3824 unsigned int optlen)
3825{
3826 struct sctp_association *asoc;
3827 sctp_assoc_t associd;
3828 int retval = -EINVAL;
3829
3830 if (optlen != sizeof(associd))
3831 goto out;
3832
3833 if (copy_from_user(&associd, optval, optlen)) {
3834 retval = -EFAULT;
3835 goto out;
3836 }
3837
3838 asoc = sctp_id2assoc(sk, associd);
3839 if (!asoc)
3840 goto out;
3841
3842 retval = sctp_send_reset_assoc(asoc);
3843
3844out:
3845 return retval;
3846}
3847
Xin Long242bd2d2017-02-09 01:18:20 +08003848static int sctp_setsockopt_add_streams(struct sock *sk,
3849 char __user *optval,
3850 unsigned int optlen)
3851{
3852 struct sctp_association *asoc;
3853 struct sctp_add_streams params;
3854 int retval = -EINVAL;
3855
3856 if (optlen != sizeof(params))
3857 goto out;
3858
3859 if (copy_from_user(&params, optval, optlen)) {
3860 retval = -EFAULT;
3861 goto out;
3862 }
3863
3864 asoc = sctp_id2assoc(sk, params.sas_assoc_id);
3865 if (!asoc)
3866 goto out;
3867
3868 retval = sctp_send_add_streams(asoc, &params);
3869
3870out:
3871 return retval;
3872}
3873
Linus Torvalds1da177e2005-04-16 15:20:36 -07003874/* API 6.2 setsockopt(), getsockopt()
3875 *
3876 * Applications use setsockopt() and getsockopt() to set or retrieve
3877 * socket options. Socket options are used to change the default
3878 * behavior of sockets calls. They are described in Section 7.
3879 *
3880 * The syntax is:
3881 *
3882 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3883 * int __user *optlen);
3884 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3885 * int optlen);
3886 *
3887 * sd - the socket descript.
3888 * level - set to IPPROTO_SCTP for all SCTP options.
3889 * optname - the option name.
3890 * optval - the buffer to store the value of the option.
3891 * optlen - the size of the buffer.
3892 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003893static int sctp_setsockopt(struct sock *sk, int level, int optname,
3894 char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003895{
3896 int retval = 0;
3897
Daniel Borkmannbb333812013-06-28 19:49:40 +02003898 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003899
3900 /* I can hardly begin to describe how wrong this is. This is
3901 * so broken as to be worse than useless. The API draft
3902 * REALLY is NOT helpful here... I am not convinced that the
3903 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3904 * are at all well-founded.
3905 */
3906 if (level != SOL_SCTP) {
3907 struct sctp_af *af = sctp_sk(sk)->pf->af;
3908 retval = af->setsockopt(sk, level, optname, optval, optlen);
3909 goto out_nounlock;
3910 }
3911
wangweidong048ed4b2014-01-21 15:44:11 +08003912 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003913
3914 switch (optname) {
3915 case SCTP_SOCKOPT_BINDX_ADD:
3916 /* 'optlen' is the size of the addresses buffer. */
3917 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3918 optlen, SCTP_BINDX_ADD_ADDR);
3919 break;
3920
3921 case SCTP_SOCKOPT_BINDX_REM:
3922 /* 'optlen' is the size of the addresses buffer. */
3923 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3924 optlen, SCTP_BINDX_REM_ADDR);
3925 break;
3926
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003927 case SCTP_SOCKOPT_CONNECTX_OLD:
3928 /* 'optlen' is the size of the addresses buffer. */
3929 retval = sctp_setsockopt_connectx_old(sk,
3930 (struct sockaddr __user *)optval,
3931 optlen);
3932 break;
3933
Frank Filz3f7a87d2005-06-20 13:14:57 -07003934 case SCTP_SOCKOPT_CONNECTX:
3935 /* 'optlen' is the size of the addresses buffer. */
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003936 retval = sctp_setsockopt_connectx(sk,
3937 (struct sockaddr __user *)optval,
3938 optlen);
Frank Filz3f7a87d2005-06-20 13:14:57 -07003939 break;
3940
Linus Torvalds1da177e2005-04-16 15:20:36 -07003941 case SCTP_DISABLE_FRAGMENTS:
3942 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3943 break;
3944
3945 case SCTP_EVENTS:
3946 retval = sctp_setsockopt_events(sk, optval, optlen);
3947 break;
3948
3949 case SCTP_AUTOCLOSE:
3950 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3951 break;
3952
3953 case SCTP_PEER_ADDR_PARAMS:
3954 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3955 break;
3956
Shan Wei4580ccc2011-01-18 22:39:00 +00003957 case SCTP_DELAYED_SACK:
Wei Yongjund364d922008-05-09 15:13:26 -07003958 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
Frank Filz77086102005-12-22 11:37:30 -08003959 break;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003960 case SCTP_PARTIAL_DELIVERY_POINT:
3961 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3962 break;
Frank Filz77086102005-12-22 11:37:30 -08003963
Linus Torvalds1da177e2005-04-16 15:20:36 -07003964 case SCTP_INITMSG:
3965 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3966 break;
3967 case SCTP_DEFAULT_SEND_PARAM:
3968 retval = sctp_setsockopt_default_send_param(sk, optval,
3969 optlen);
3970 break;
Geir Ola Vaagland6b3fd5f2014-07-12 20:30:39 +02003971 case SCTP_DEFAULT_SNDINFO:
3972 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
3973 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003974 case SCTP_PRIMARY_ADDR:
3975 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3976 break;
3977 case SCTP_SET_PEER_PRIMARY_ADDR:
3978 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3979 break;
3980 case SCTP_NODELAY:
3981 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3982 break;
3983 case SCTP_RTOINFO:
3984 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3985 break;
3986 case SCTP_ASSOCINFO:
3987 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3988 break;
3989 case SCTP_I_WANT_MAPPED_V4_ADDR:
3990 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3991 break;
3992 case SCTP_MAXSEG:
3993 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3994 break;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003995 case SCTP_ADAPTATION_LAYER:
3996 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003997 break;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003998 case SCTP_CONTEXT:
3999 retval = sctp_setsockopt_context(sk, optval, optlen);
4000 break;
Vlad Yasevichb6e13312007-04-20 12:23:15 -07004001 case SCTP_FRAGMENT_INTERLEAVE:
4002 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4003 break;
Vlad Yasevich70331572007-03-23 11:34:36 -07004004 case SCTP_MAX_BURST:
4005 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4006 break;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07004007 case SCTP_AUTH_CHUNK:
4008 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4009 break;
4010 case SCTP_HMAC_IDENT:
4011 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4012 break;
4013 case SCTP_AUTH_KEY:
4014 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4015 break;
4016 case SCTP_AUTH_ACTIVE_KEY:
4017 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4018 break;
4019 case SCTP_AUTH_DELETE_KEY:
4020 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4021 break;
Michio Honda7dc04d72011-04-26 20:16:31 +09004022 case SCTP_AUTO_ASCONF:
4023 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4024 break;
Neil Horman5aa93bc2012-07-21 07:56:07 +00004025 case SCTP_PEER_ADDR_THLDS:
4026 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
4027 break;
Geir Ola Vaagland0d3a4212014-07-12 20:30:37 +02004028 case SCTP_RECVRCVINFO:
4029 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4030 break;
Geir Ola Vaagland2347c802014-07-12 20:30:38 +02004031 case SCTP_RECVNXTINFO:
4032 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4033 break;
Xin Long28aa4c22016-07-09 19:47:40 +08004034 case SCTP_PR_SUPPORTED:
4035 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4036 break;
Xin Longf959fb42016-07-09 19:47:41 +08004037 case SCTP_DEFAULT_PRINFO:
4038 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4039 break;
Xin Long9fb657a2017-01-18 00:44:46 +08004040 case SCTP_ENABLE_STREAM_RESET:
4041 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4042 break;
Xin Long7f9d68a2017-01-18 00:44:47 +08004043 case SCTP_RESET_STREAMS:
4044 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4045 break;
Xin Longa92ce1a2017-02-09 01:18:18 +08004046 case SCTP_RESET_ASSOC:
4047 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4048 break;
Xin Long242bd2d2017-02-09 01:18:20 +08004049 case SCTP_ADD_STREAMS:
4050 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4051 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004052 default:
4053 retval = -ENOPROTOOPT;
4054 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07004055 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004056
wangweidong048ed4b2014-01-21 15:44:11 +08004057 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004058
4059out_nounlock:
4060 return retval;
4061}
4062
4063/* API 3.1.6 connect() - UDP Style Syntax
4064 *
4065 * An application may use the connect() call in the UDP model to initiate an
4066 * association without sending data.
4067 *
4068 * The syntax is:
4069 *
4070 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4071 *
4072 * sd: the socket descriptor to have a new association added to.
4073 *
4074 * nam: the address structure (either struct sockaddr_in or struct
4075 * sockaddr_in6 defined in RFC2553 [7]).
4076 *
4077 * len: the size of the address.
4078 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02004079static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4080 int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004081{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004082 int err = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07004083 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004084
wangweidong048ed4b2014-01-21 15:44:11 +08004085 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004086
Daniel Borkmannbb333812013-06-28 19:49:40 +02004087 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4088 addr, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004089
Frank Filz3f7a87d2005-06-20 13:14:57 -07004090 /* Validate addr_len before calling common connect/connectx routine. */
4091 af = sctp_get_af_specific(addr->sa_family);
4092 if (!af || addr_len < af->sockaddr_len) {
4093 err = -EINVAL;
4094 } else {
4095 /* Pass correct addr len to common routine (so it knows there
4096 * is only one address being passed.
4097 */
Vlad Yasevich88a0a942008-05-09 15:14:11 -07004098 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004099 }
4100
wangweidong048ed4b2014-01-21 15:44:11 +08004101 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004102 return err;
4103}
4104
4105/* FIXME: Write comments. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02004106static int sctp_disconnect(struct sock *sk, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004107{
4108 return -EOPNOTSUPP; /* STUB */
4109}
4110
4111/* 4.1.4 accept() - TCP Style Syntax
4112 *
4113 * Applications use accept() call to remove an established SCTP
4114 * association from the accept queue of the endpoint. A new socket
4115 * descriptor will be returned from accept() to represent the newly
4116 * formed association.
4117 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02004118static struct sock *sctp_accept(struct sock *sk, int flags, int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004119{
4120 struct sctp_sock *sp;
4121 struct sctp_endpoint *ep;
4122 struct sock *newsk = NULL;
4123 struct sctp_association *asoc;
4124 long timeo;
4125 int error = 0;
4126
wangweidong048ed4b2014-01-21 15:44:11 +08004127 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004128
4129 sp = sctp_sk(sk);
4130 ep = sp->ep;
4131
4132 if (!sctp_style(sk, TCP)) {
4133 error = -EOPNOTSUPP;
4134 goto out;
4135 }
4136
4137 if (!sctp_sstate(sk, LISTENING)) {
4138 error = -EINVAL;
4139 goto out;
4140 }
4141
Sridhar Samudrala8abfedd2006-08-22 00:24:09 -07004142 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004143
4144 error = sctp_wait_for_accept(sk, timeo);
4145 if (error)
4146 goto out;
4147
4148 /* We treat the list of associations on the endpoint as the accept
4149 * queue and pick the first association on the list.
4150 */
4151 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4152
4153 newsk = sp->pf->create_accept_sk(sk, asoc);
4154 if (!newsk) {
4155 error = -ENOMEM;
4156 goto out;
4157 }
4158
4159 /* Populate the fields of the newsk from the oldsk and migrate the
4160 * asoc to the newsk.
4161 */
4162 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4163
4164out:
wangweidong048ed4b2014-01-21 15:44:11 +08004165 release_sock(sk);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004166 *err = error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004167 return newsk;
4168}
4169
4170/* The SCTP ioctl handler. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02004171static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004172{
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00004173 int rc = -ENOTCONN;
4174
wangweidong048ed4b2014-01-21 15:44:11 +08004175 lock_sock(sk);
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00004176
4177 /*
4178 * SEQPACKET-style sockets in LISTENING state are valid, for
4179 * SCTP, so only discard TCP-style sockets in LISTENING state.
4180 */
4181 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4182 goto out;
4183
4184 switch (cmd) {
4185 case SIOCINQ: {
4186 struct sk_buff *skb;
4187 unsigned int amount = 0;
4188
4189 skb = skb_peek(&sk->sk_receive_queue);
4190 if (skb != NULL) {
4191 /*
4192 * We will only return the amount of this packet since
4193 * that is all that will be read.
4194 */
4195 amount = skb->len;
4196 }
4197 rc = put_user(amount, (int __user *)arg);
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00004198 break;
David S. Miller9a7241c2010-10-03 22:14:37 -07004199 }
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00004200 default:
4201 rc = -ENOIOCTLCMD;
4202 break;
4203 }
4204out:
wangweidong048ed4b2014-01-21 15:44:11 +08004205 release_sock(sk);
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00004206 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004207}
4208
4209/* This is the function which gets called during socket creation to
4210 * initialized the SCTP-specific portion of the sock.
4211 * The sock structure should already be zero-filled memory.
4212 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02004213static int sctp_init_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004214{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004215 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004216 struct sctp_sock *sp;
4217
Daniel Borkmannbb333812013-06-28 19:49:40 +02004218 pr_debug("%s: sk:%p\n", __func__, sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004219
4220 sp = sctp_sk(sk);
4221
4222 /* Initialize the SCTP per socket area. */
4223 switch (sk->sk_type) {
4224 case SOCK_SEQPACKET:
4225 sp->type = SCTP_SOCKET_UDP;
4226 break;
4227 case SOCK_STREAM:
4228 sp->type = SCTP_SOCKET_TCP;
4229 break;
4230 default:
4231 return -ESOCKTNOSUPPORT;
4232 }
4233
Marcelo Ricardo Leitner90017ac2016-06-02 15:05:43 -03004234 sk->sk_gso_type = SKB_GSO_SCTP;
4235
Linus Torvalds1da177e2005-04-16 15:20:36 -07004236 /* Initialize default send parameters. These parameters can be
4237 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4238 */
4239 sp->default_stream = 0;
4240 sp->default_ppid = 0;
4241 sp->default_flags = 0;
4242 sp->default_context = 0;
4243 sp->default_timetolive = 0;
4244
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08004245 sp->default_rcv_context = 0;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004246 sp->max_burst = net->sctp.max_burst;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08004247
Neil Horman3c681982012-10-24 09:20:03 +00004248 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4249
Linus Torvalds1da177e2005-04-16 15:20:36 -07004250 /* Initialize default setup parameters. These parameters
4251 * can be modified with the SCTP_INITMSG socket option or
4252 * overridden by the SCTP_INIT CMSG.
4253 */
4254 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4255 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004256 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4257 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004258
4259 /* Initialize default RTO related parameters. These parameters can
4260 * be modified for with the SCTP_RTOINFO socket option.
4261 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004262 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4263 sp->rtoinfo.srto_max = net->sctp.rto_max;
4264 sp->rtoinfo.srto_min = net->sctp.rto_min;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004265
4266 /* Initialize default association related parameters. These parameters
4267 * can be modified with the SCTP_ASSOCINFO socket option.
4268 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004269 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004270 sp->assocparams.sasoc_number_peer_destinations = 0;
4271 sp->assocparams.sasoc_peer_rwnd = 0;
4272 sp->assocparams.sasoc_local_rwnd = 0;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004273 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004274
4275 /* Initialize default event subscriptions. By default, all the
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004276 * options are off.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004277 */
4278 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4279
4280 /* Default Peer Address Parameters. These defaults can
4281 * be modified via SCTP_PEER_ADDR_PARAMS
4282 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004283 sp->hbinterval = net->sctp.hb_interval;
4284 sp->pathmaxrxt = net->sctp.max_retrans_path;
wangweidong4e2d52b2013-12-23 12:16:54 +08004285 sp->pathmtu = 0; /* allow default discovery */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004286 sp->sackdelay = net->sctp.sack_timeout;
Vlad Yasevich7bfe8bdb2008-06-09 15:45:05 -07004287 sp->sackfreq = 2;
Frank Filz52ccb8e2005-12-22 11:36:46 -08004288 sp->param_flags = SPP_HB_ENABLE |
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004289 SPP_PMTUD_ENABLE |
4290 SPP_SACKDELAY_ENABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004291
4292 /* If enabled no SCTP message fragmentation will be performed.
4293 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4294 */
4295 sp->disable_fragments = 0;
4296
Sridhar Samudrala208edef2006-09-29 17:08:01 -07004297 /* Enable Nagle algorithm by default. */
4298 sp->nodelay = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004299
Geir Ola Vaagland0d3a4212014-07-12 20:30:37 +02004300 sp->recvrcvinfo = 0;
Geir Ola Vaagland2347c802014-07-12 20:30:38 +02004301 sp->recvnxtinfo = 0;
Geir Ola Vaagland0d3a4212014-07-12 20:30:37 +02004302
Linus Torvalds1da177e2005-04-16 15:20:36 -07004303 /* Enable by default. */
4304 sp->v4mapped = 1;
4305
4306 /* Auto-close idle associations after the configured
4307 * number of seconds. A value of 0 disables this
4308 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4309 * for UDP-style sockets only.
4310 */
4311 sp->autoclose = 0;
4312
4313 /* User specified fragmentation limit. */
4314 sp->user_frag = 0;
4315
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004316 sp->adaptation_ind = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004317
4318 sp->pf = sctp_get_pf_specific(sk->sk_family);
4319
4320 /* Control variables for partial data delivery. */
Vlad Yasevichb6e13312007-04-20 12:23:15 -07004321 atomic_set(&sp->pd_mode, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004322 skb_queue_head_init(&sp->pd_lobby);
Vlad Yasevichb6e13312007-04-20 12:23:15 -07004323 sp->frag_interleave = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004324
4325 /* Create a per socket endpoint structure. Even if we
4326 * change the data structure relationships, this may still
4327 * be useful for storing pre-connect address information.
4328 */
Daniel Borkmannc164b832013-06-14 18:24:06 +02004329 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4330 if (!sp->ep)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004331 return -ENOMEM;
4332
Linus Torvalds1da177e2005-04-16 15:20:36 -07004333 sp->hmac = NULL;
4334
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +02004335 sk->sk_destruct = sctp_destruct_sock;
4336
Linus Torvalds1da177e2005-04-16 15:20:36 -07004337 SCTP_DBG_OBJCNT_INC(sock);
David S. Miller6f756a82008-11-23 17:34:03 -08004338
4339 local_bh_disable();
Vlad Yasevich81419d82010-04-28 08:47:20 +00004340 percpu_counter_inc(&sctp_sockets_allocated);
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004341 sock_prot_inuse_add(net, sk->sk_prot, 1);
Marcelo Ricardo Leitner2d45a022015-06-12 10:16:41 -03004342
4343 /* Nothing can fail after this block, otherwise
4344 * sctp_destroy_sock() will be called without addr_wq_lock held
4345 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004346 if (net->sctp.default_auto_asconf) {
Marcelo Ricardo Leitner2d45a022015-06-12 10:16:41 -03004347 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
Michio Honda9f7d6532011-04-26 19:32:51 +09004348 list_add_tail(&sp->auto_asconf_list,
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004349 &net->sctp.auto_asconf_splist);
Michio Honda9f7d6532011-04-26 19:32:51 +09004350 sp->do_auto_asconf = 1;
Marcelo Ricardo Leitner2d45a022015-06-12 10:16:41 -03004351 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4352 } else {
Michio Honda9f7d6532011-04-26 19:32:51 +09004353 sp->do_auto_asconf = 0;
Marcelo Ricardo Leitner2d45a022015-06-12 10:16:41 -03004354 }
4355
David S. Miller6f756a82008-11-23 17:34:03 -08004356 local_bh_enable();
4357
Linus Torvalds1da177e2005-04-16 15:20:36 -07004358 return 0;
4359}
4360
Marcelo Ricardo Leitner2d45a022015-06-12 10:16:41 -03004361/* Cleanup any SCTP per socket resources. Must be called with
4362 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4363 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02004364static void sctp_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004365{
Michio Honda9f7d6532011-04-26 19:32:51 +09004366 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004367
Daniel Borkmannbb333812013-06-28 19:49:40 +02004368 pr_debug("%s: sk:%p\n", __func__, sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004369
4370 /* Release our hold on the endpoint. */
Michio Honda9f7d6532011-04-26 19:32:51 +09004371 sp = sctp_sk(sk);
Daniel Borkmann1abd1652013-06-06 15:53:47 +02004372 /* This could happen during socket init, thus we bail out
4373 * early, since the rest of the below is not setup either.
4374 */
4375 if (sp->ep == NULL)
4376 return;
4377
Michio Honda9f7d6532011-04-26 19:32:51 +09004378 if (sp->do_auto_asconf) {
4379 sp->do_auto_asconf = 0;
4380 list_del(&sp->auto_asconf_list);
4381 }
4382 sctp_endpoint_free(sp->ep);
Eric Dumazet5bc0b3b2008-11-25 13:53:27 -08004383 local_bh_disable();
Vlad Yasevich81419d82010-04-28 08:47:20 +00004384 percpu_counter_dec(&sctp_sockets_allocated);
Eric Dumazet9a57f7f2008-11-17 02:41:00 -08004385 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
Eric Dumazet5bc0b3b2008-11-25 13:53:27 -08004386 local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004387}
4388
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +02004389/* Triggered when there are no references on the socket anymore */
4390static void sctp_destruct_sock(struct sock *sk)
4391{
4392 struct sctp_sock *sp = sctp_sk(sk);
4393
4394 /* Free up the HMAC transform. */
Herbert Xu5821c762016-01-24 21:20:12 +08004395 crypto_free_shash(sp->hmac);
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +02004396
4397 inet_sock_destruct(sk);
4398}
4399
Linus Torvalds1da177e2005-04-16 15:20:36 -07004400/* API 4.1.7 shutdown() - TCP Style Syntax
4401 * int shutdown(int socket, int how);
4402 *
4403 * sd - the socket descriptor of the association to be closed.
4404 * how - Specifies the type of shutdown. The values are
4405 * as follows:
4406 * SHUT_RD
4407 * Disables further receive operations. No SCTP
4408 * protocol action is taken.
4409 * SHUT_WR
4410 * Disables further send operations, and initiates
4411 * the SCTP shutdown sequence.
4412 * SHUT_RDWR
4413 * Disables further send and receive operations
4414 * and initiates the SCTP shutdown sequence.
4415 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02004416static void sctp_shutdown(struct sock *sk, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004417{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00004418 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004419 struct sctp_endpoint *ep;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004420
4421 if (!sctp_style(sk, TCP))
4422 return;
4423
Xin Long5bf35dd2016-11-13 21:44:37 +08004424 ep = sctp_sk(sk)->ep;
4425 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
4426 struct sctp_association *asoc;
4427
Xin Longd46e4162016-06-09 22:48:18 +08004428 sk->sk_state = SCTP_SS_CLOSING;
Xin Long5bf35dd2016-11-13 21:44:37 +08004429 asoc = list_entry(ep->asocs.next,
4430 struct sctp_association, asocs);
4431 sctp_primitive_SHUTDOWN(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004432 }
4433}
4434
Xin Long52c52a62016-04-14 15:35:30 +08004435int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
4436 struct sctp_info *info)
4437{
4438 struct sctp_transport *prim;
4439 struct list_head *pos;
4440 int mask;
4441
4442 memset(info, 0, sizeof(*info));
4443 if (!asoc) {
4444 struct sctp_sock *sp = sctp_sk(sk);
4445
4446 info->sctpi_s_autoclose = sp->autoclose;
4447 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
4448 info->sctpi_s_pd_point = sp->pd_point;
4449 info->sctpi_s_nodelay = sp->nodelay;
4450 info->sctpi_s_disable_fragments = sp->disable_fragments;
4451 info->sctpi_s_v4mapped = sp->v4mapped;
4452 info->sctpi_s_frag_interleave = sp->frag_interleave;
Xin Long40eb90e92016-05-29 17:42:13 +08004453 info->sctpi_s_type = sp->type;
Xin Long52c52a62016-04-14 15:35:30 +08004454
4455 return 0;
4456 }
4457
4458 info->sctpi_tag = asoc->c.my_vtag;
4459 info->sctpi_state = asoc->state;
4460 info->sctpi_rwnd = asoc->a_rwnd;
4461 info->sctpi_unackdata = asoc->unack_data;
4462 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4463 info->sctpi_instrms = asoc->c.sinit_max_instreams;
4464 info->sctpi_outstrms = asoc->c.sinit_num_ostreams;
4465 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
4466 info->sctpi_inqueue++;
4467 list_for_each(pos, &asoc->outqueue.out_chunk_list)
4468 info->sctpi_outqueue++;
4469 info->sctpi_overall_error = asoc->overall_error_count;
4470 info->sctpi_max_burst = asoc->max_burst;
4471 info->sctpi_maxseg = asoc->frag_point;
4472 info->sctpi_peer_rwnd = asoc->peer.rwnd;
4473 info->sctpi_peer_tag = asoc->c.peer_vtag;
4474
4475 mask = asoc->peer.ecn_capable << 1;
4476 mask = (mask | asoc->peer.ipv4_address) << 1;
4477 mask = (mask | asoc->peer.ipv6_address) << 1;
4478 mask = (mask | asoc->peer.hostname_address) << 1;
4479 mask = (mask | asoc->peer.asconf_capable) << 1;
4480 mask = (mask | asoc->peer.prsctp_capable) << 1;
4481 mask = (mask | asoc->peer.auth_capable);
4482 info->sctpi_peer_capable = mask;
4483 mask = asoc->peer.sack_needed << 1;
4484 mask = (mask | asoc->peer.sack_generation) << 1;
4485 mask = (mask | asoc->peer.zero_window_announced);
4486 info->sctpi_peer_sack = mask;
4487
4488 info->sctpi_isacks = asoc->stats.isacks;
4489 info->sctpi_osacks = asoc->stats.osacks;
4490 info->sctpi_opackets = asoc->stats.opackets;
4491 info->sctpi_ipackets = asoc->stats.ipackets;
4492 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
4493 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
4494 info->sctpi_idupchunks = asoc->stats.idupchunks;
4495 info->sctpi_gapcnt = asoc->stats.gapcnt;
4496 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
4497 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
4498 info->sctpi_oodchunks = asoc->stats.oodchunks;
4499 info->sctpi_iodchunks = asoc->stats.iodchunks;
4500 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
4501 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
4502
4503 prim = asoc->peer.primary_path;
4504 memcpy(&info->sctpi_p_address, &prim->ipaddr,
4505 sizeof(struct sockaddr_storage));
4506 info->sctpi_p_state = prim->state;
4507 info->sctpi_p_cwnd = prim->cwnd;
4508 info->sctpi_p_srtt = prim->srtt;
4509 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
4510 info->sctpi_p_hbinterval = prim->hbinterval;
4511 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
4512 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
4513 info->sctpi_p_ssthresh = prim->ssthresh;
4514 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
4515 info->sctpi_p_flight_size = prim->flight_size;
4516 info->sctpi_p_error = prim->error_count;
4517
4518 return 0;
4519}
4520EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
4521
Xin Long626d16f2016-04-14 15:35:31 +08004522/* use callback to avoid exporting the core structure */
4523int sctp_transport_walk_start(struct rhashtable_iter *iter)
4524{
4525 int err;
4526
Xin Long7fda7022016-11-15 23:23:11 +08004527 rhltable_walk_enter(&sctp_transport_hashtable, iter);
Xin Long626d16f2016-04-14 15:35:31 +08004528
4529 err = rhashtable_walk_start(iter);
Xin Long53fa1032016-04-14 15:35:35 +08004530 if (err && err != -EAGAIN) {
Vegard Nossum5fc382d2016-07-23 09:42:35 +02004531 rhashtable_walk_stop(iter);
Xin Long53fa1032016-04-14 15:35:35 +08004532 rhashtable_walk_exit(iter);
4533 return err;
4534 }
Xin Long626d16f2016-04-14 15:35:31 +08004535
Xin Long53fa1032016-04-14 15:35:35 +08004536 return 0;
Xin Long626d16f2016-04-14 15:35:31 +08004537}
4538
4539void sctp_transport_walk_stop(struct rhashtable_iter *iter)
4540{
4541 rhashtable_walk_stop(iter);
4542 rhashtable_walk_exit(iter);
4543}
4544
4545struct sctp_transport *sctp_transport_get_next(struct net *net,
4546 struct rhashtable_iter *iter)
4547{
4548 struct sctp_transport *t;
4549
4550 t = rhashtable_walk_next(iter);
4551 for (; t; t = rhashtable_walk_next(iter)) {
4552 if (IS_ERR(t)) {
4553 if (PTR_ERR(t) == -EAGAIN)
4554 continue;
4555 break;
4556 }
4557
4558 if (net_eq(sock_net(t->asoc->base.sk), net) &&
4559 t->asoc->peer.primary_path == t)
4560 break;
4561 }
4562
4563 return t;
4564}
4565
4566struct sctp_transport *sctp_transport_get_idx(struct net *net,
4567 struct rhashtable_iter *iter,
4568 int pos)
4569{
4570 void *obj = SEQ_START_TOKEN;
4571
4572 while (pos && (obj = sctp_transport_get_next(net, iter)) &&
4573 !IS_ERR(obj))
4574 pos--;
4575
4576 return obj;
4577}
4578
4579int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
4580 void *p) {
4581 int err = 0;
4582 int hash = 0;
4583 struct sctp_ep_common *epb;
4584 struct sctp_hashbucket *head;
4585
4586 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
4587 hash++, head++) {
4588 read_lock(&head->lock);
4589 sctp_for_each_hentry(epb, &head->chain) {
4590 err = cb(sctp_ep(epb), p);
4591 if (err)
4592 break;
4593 }
4594 read_unlock(&head->lock);
4595 }
4596
4597 return err;
4598}
4599EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
4600
4601int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
4602 struct net *net,
4603 const union sctp_addr *laddr,
4604 const union sctp_addr *paddr, void *p)
4605{
4606 struct sctp_transport *transport;
Xin Long08abb792016-12-15 23:05:52 +08004607 int err;
Xin Long626d16f2016-04-14 15:35:31 +08004608
4609 rcu_read_lock();
4610 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
Xin Long626d16f2016-04-14 15:35:31 +08004611 rcu_read_unlock();
Xin Long08abb792016-12-15 23:05:52 +08004612 if (!transport)
4613 return -ENOENT;
4614
Xin Long1cceda782016-09-29 02:55:44 +08004615 err = cb(transport, p);
Xin Longcd26da42016-10-31 20:32:31 +08004616 sctp_transport_put(transport);
Xin Long1cceda782016-09-29 02:55:44 +08004617
Xin Long626d16f2016-04-14 15:35:31 +08004618 return err;
4619}
4620EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
4621
4622int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
4623 struct net *net, int pos, void *p) {
4624 struct rhashtable_iter hti;
Xin Long626d16f2016-04-14 15:35:31 +08004625 void *obj;
Xin Long53fa1032016-04-14 15:35:35 +08004626 int err;
Xin Long626d16f2016-04-14 15:35:31 +08004627
Xin Long53fa1032016-04-14 15:35:35 +08004628 err = sctp_transport_walk_start(&hti);
4629 if (err)
4630 return err;
Xin Long626d16f2016-04-14 15:35:31 +08004631
4632 sctp_transport_get_idx(net, &hti, pos);
4633 obj = sctp_transport_get_next(net, &hti);
4634 for (; obj && !IS_ERR(obj); obj = sctp_transport_get_next(net, &hti)) {
4635 struct sctp_transport *transport = obj;
4636
4637 if (!sctp_transport_hold(transport))
4638 continue;
4639 err = cb(transport, p);
4640 sctp_transport_put(transport);
4641 if (err)
4642 break;
4643 }
Xin Long626d16f2016-04-14 15:35:31 +08004644 sctp_transport_walk_stop(&hti);
Xin Long53fa1032016-04-14 15:35:35 +08004645
Xin Long626d16f2016-04-14 15:35:31 +08004646 return err;
4647}
4648EXPORT_SYMBOL_GPL(sctp_for_each_transport);
4649
Linus Torvalds1da177e2005-04-16 15:20:36 -07004650/* 7.2.1 Association Status (SCTP_STATUS)
4651
4652 * Applications can retrieve current status information about an
4653 * association, including association state, peer receiver window size,
4654 * number of unacked data chunks, and number of data chunks pending
4655 * receipt. This information is read-only.
4656 */
4657static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4658 char __user *optval,
4659 int __user *optlen)
4660{
4661 struct sctp_status status;
4662 struct sctp_association *asoc = NULL;
4663 struct sctp_transport *transport;
4664 sctp_assoc_t associd;
4665 int retval = 0;
4666
Neil Horman408f22e2007-06-16 14:03:45 -04004667 if (len < sizeof(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004668 retval = -EINVAL;
4669 goto out;
4670 }
4671
Neil Horman408f22e2007-06-16 14:03:45 -04004672 len = sizeof(status);
4673 if (copy_from_user(&status, optval, len)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004674 retval = -EFAULT;
4675 goto out;
4676 }
4677
4678 associd = status.sstat_assoc_id;
4679 asoc = sctp_id2assoc(sk, associd);
4680 if (!asoc) {
4681 retval = -EINVAL;
4682 goto out;
4683 }
4684
4685 transport = asoc->peer.primary_path;
4686
4687 status.sstat_assoc_id = sctp_assoc2id(asoc);
Daniel Borkmann38ab1fa2014-08-28 15:28:26 +02004688 status.sstat_state = sctp_assoc_to_state(asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004689 status.sstat_rwnd = asoc->peer.rwnd;
4690 status.sstat_unackdata = asoc->unack_data;
4691
4692 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4693 status.sstat_instrms = asoc->c.sinit_max_instreams;
4694 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4695 status.sstat_fragmentation_point = asoc->frag_point;
4696 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
Al Viro8cec6b82006-11-20 17:23:01 -08004697 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4698 transport->af_specific->sockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004699 /* Map ipv4 address into v4-mapped-on-v6 address. */
Jason Gunthorpe299ee122014-07-30 12:40:53 -06004700 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
Linus Torvalds1da177e2005-04-16 15:20:36 -07004701 (union sctp_addr *)&status.sstat_primary.spinfo_address);
Frank Filz3f7a87d2005-06-20 13:14:57 -07004702 status.sstat_primary.spinfo_state = transport->state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004703 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4704 status.sstat_primary.spinfo_srtt = transport->srtt;
4705 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
Frank Filz52ccb8e2005-12-22 11:36:46 -08004706 status.sstat_primary.spinfo_mtu = transport->pathmtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004707
Frank Filz3f7a87d2005-06-20 13:14:57 -07004708 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4709 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4710
Linus Torvalds1da177e2005-04-16 15:20:36 -07004711 if (put_user(len, optlen)) {
4712 retval = -EFAULT;
4713 goto out;
4714 }
4715
Daniel Borkmannbb333812013-06-28 19:49:40 +02004716 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4717 __func__, len, status.sstat_state, status.sstat_rwnd,
4718 status.sstat_assoc_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004719
4720 if (copy_to_user(optval, &status, len)) {
4721 retval = -EFAULT;
4722 goto out;
4723 }
4724
4725out:
Eric Dumazeta02cec22010-09-22 20:43:57 +00004726 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004727}
4728
4729
4730/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4731 *
4732 * Applications can retrieve information about a specific peer address
4733 * of an association, including its reachability state, congestion
4734 * window, and retransmission timer values. This information is
4735 * read-only.
4736 */
4737static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4738 char __user *optval,
4739 int __user *optlen)
4740{
4741 struct sctp_paddrinfo pinfo;
4742 struct sctp_transport *transport;
4743 int retval = 0;
4744
Neil Horman408f22e2007-06-16 14:03:45 -04004745 if (len < sizeof(pinfo)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004746 retval = -EINVAL;
4747 goto out;
4748 }
4749
Neil Horman408f22e2007-06-16 14:03:45 -04004750 len = sizeof(pinfo);
4751 if (copy_from_user(&pinfo, optval, len)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004752 retval = -EFAULT;
4753 goto out;
4754 }
4755
4756 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4757 pinfo.spinfo_assoc_id);
4758 if (!transport)
4759 return -EINVAL;
4760
4761 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
Frank Filz3f7a87d2005-06-20 13:14:57 -07004762 pinfo.spinfo_state = transport->state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004763 pinfo.spinfo_cwnd = transport->cwnd;
4764 pinfo.spinfo_srtt = transport->srtt;
4765 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
Frank Filz52ccb8e2005-12-22 11:36:46 -08004766 pinfo.spinfo_mtu = transport->pathmtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004767
Frank Filz3f7a87d2005-06-20 13:14:57 -07004768 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4769 pinfo.spinfo_state = SCTP_ACTIVE;
4770
Linus Torvalds1da177e2005-04-16 15:20:36 -07004771 if (put_user(len, optlen)) {
4772 retval = -EFAULT;
4773 goto out;
4774 }
4775
4776 if (copy_to_user(optval, &pinfo, len)) {
4777 retval = -EFAULT;
4778 goto out;
4779 }
4780
4781out:
Eric Dumazeta02cec22010-09-22 20:43:57 +00004782 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004783}
4784
4785/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4786 *
4787 * This option is a on/off flag. If enabled no SCTP message
4788 * fragmentation will be performed. Instead if a message being sent
4789 * exceeds the current PMTU size, the message will NOT be sent and
4790 * instead a error will be indicated to the user.
4791 */
4792static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4793 char __user *optval, int __user *optlen)
4794{
4795 int val;
4796
4797 if (len < sizeof(int))
4798 return -EINVAL;
4799
4800 len = sizeof(int);
4801 val = (sctp_sk(sk)->disable_fragments == 1);
4802 if (put_user(len, optlen))
4803 return -EFAULT;
4804 if (copy_to_user(optval, &val, len))
4805 return -EFAULT;
4806 return 0;
4807}
4808
4809/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4810 *
4811 * This socket option is used to specify various notifications and
4812 * ancillary data the user wishes to receive.
4813 */
4814static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4815 int __user *optlen)
4816{
Jiri Slabya4b8e712016-10-21 14:13:24 +02004817 if (len == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004818 return -EINVAL;
Thomas Grafacdd5982012-04-03 22:17:53 +00004819 if (len > sizeof(struct sctp_event_subscribe))
4820 len = sizeof(struct sctp_event_subscribe);
Neil Horman408f22e2007-06-16 14:03:45 -04004821 if (put_user(len, optlen))
4822 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004823 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4824 return -EFAULT;
4825 return 0;
4826}
4827
4828/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4829 *
4830 * This socket option is applicable to the UDP-style socket only. When
4831 * set it will cause associations that are idle for more than the
4832 * specified number of seconds to automatically close. An association
4833 * being idle is defined an association that has NOT sent or received
4834 * user data. The special value of '0' indicates that no automatic
4835 * close of any associations should be performed. The option expects an
4836 * integer defining the number of seconds of idle time before an
4837 * association is closed.
4838 */
4839static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4840{
4841 /* Applicable to UDP-style socket only */
4842 if (sctp_style(sk, TCP))
4843 return -EOPNOTSUPP;
Neil Horman408f22e2007-06-16 14:03:45 -04004844 if (len < sizeof(int))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004845 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004846 len = sizeof(int);
4847 if (put_user(len, optlen))
4848 return -EFAULT;
4849 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004850 return -EFAULT;
4851 return 0;
4852}
4853
4854/* Helper routine to branch off an association to a new socket. */
Benjamin Poirier0343c552012-03-08 05:55:58 +00004855int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004856{
Benjamin Poirier0343c552012-03-08 05:55:58 +00004857 struct sctp_association *asoc = sctp_id2assoc(sk, id);
Jason Gunthorpe299ee122014-07-30 12:40:53 -06004858 struct sctp_sock *sp = sctp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004859 struct socket *sock;
4860 int err = 0;
4861
Benjamin Poirier0343c552012-03-08 05:55:58 +00004862 if (!asoc)
4863 return -EINVAL;
4864
Linus Torvalds1da177e2005-04-16 15:20:36 -07004865 /* An association cannot be branched off from an already peeled-off
4866 * socket, nor is this supported for tcp style sockets.
4867 */
4868 if (!sctp_style(sk, UDP))
4869 return -EINVAL;
4870
4871 /* Create a new socket. */
4872 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4873 if (err < 0)
4874 return err;
4875
Vlad Yasevich914e1c82009-02-13 08:33:44 +00004876 sctp_copy_sock(sock->sk, sk, asoc);
Vlad Yasevich4f444302006-10-30 18:54:32 -08004877
4878 /* Make peeled-off sockets more like 1-1 accepted sockets.
4879 * Set the daddr and initialize id to something more random
4880 */
Jason Gunthorpe299ee122014-07-30 12:40:53 -06004881 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
Vlad Yasevich914e1c82009-02-13 08:33:44 +00004882
4883 /* Populate the fields of the newsk from the oldsk and migrate the
4884 * asoc to the newsk.
4885 */
4886 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
Vlad Yasevich4f444302006-10-30 18:54:32 -08004887
Linus Torvalds1da177e2005-04-16 15:20:36 -07004888 *sockp = sock;
4889
4890 return err;
4891}
Benjamin Poirier0343c552012-03-08 05:55:58 +00004892EXPORT_SYMBOL(sctp_do_peeloff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004893
4894static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4895{
4896 sctp_peeloff_arg_t peeloff;
4897 struct socket *newsock;
Al Viro56b31d12012-08-18 00:25:51 -04004898 struct file *newfile;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004899 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004900
Neil Horman408f22e2007-06-16 14:03:45 -04004901 if (len < sizeof(sctp_peeloff_arg_t))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004902 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004903 len = sizeof(sctp_peeloff_arg_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004904 if (copy_from_user(&peeloff, optval, len))
4905 return -EFAULT;
4906
Benjamin Poirier0343c552012-03-08 05:55:58 +00004907 retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004908 if (retval < 0)
4909 goto out;
4910
4911 /* Map the socket to an unused fd that can be returned to the user. */
Yann Droneaud8a59bd32013-07-02 18:39:36 +02004912 retval = get_unused_fd_flags(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004913 if (retval < 0) {
4914 sock_release(newsock);
4915 goto out;
4916 }
4917
Linus Torvaldsaab174f2012-10-02 20:25:04 -07004918 newfile = sock_alloc_file(newsock, 0, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05304919 if (IS_ERR(newfile)) {
Al Viro56b31d12012-08-18 00:25:51 -04004920 put_unused_fd(retval);
4921 sock_release(newsock);
4922 return PTR_ERR(newfile);
4923 }
4924
Daniel Borkmannbb333812013-06-28 19:49:40 +02004925 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
4926 retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004927
4928 /* Return the fd mapped to the new socket. */
Al Viro56b31d12012-08-18 00:25:51 -04004929 if (put_user(len, optlen)) {
4930 fput(newfile);
4931 put_unused_fd(retval);
Neil Horman408f22e2007-06-16 14:03:45 -04004932 return -EFAULT;
Al Viro56b31d12012-08-18 00:25:51 -04004933 }
4934 peeloff.sd = retval;
4935 if (copy_to_user(optval, &peeloff, len)) {
4936 fput(newfile);
4937 put_unused_fd(retval);
4938 return -EFAULT;
4939 }
4940 fd_install(retval, newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004941out:
4942 return retval;
4943}
4944
4945/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4946 *
4947 * Applications can enable or disable heartbeats for any peer address of
4948 * an association, modify an address's heartbeat interval, force a
4949 * heartbeat to be sent immediately, and adjust the address's maximum
4950 * number of retransmissions sent before an address is considered
4951 * unreachable. The following structure is used to access and modify an
4952 * address's parameters:
4953 *
4954 * struct sctp_paddrparams {
Frank Filz52ccb8e2005-12-22 11:36:46 -08004955 * sctp_assoc_t spp_assoc_id;
4956 * struct sockaddr_storage spp_address;
4957 * uint32_t spp_hbinterval;
4958 * uint16_t spp_pathmaxrxt;
4959 * uint32_t spp_pathmtu;
4960 * uint32_t spp_sackdelay;
4961 * uint32_t spp_flags;
4962 * };
Linus Torvalds1da177e2005-04-16 15:20:36 -07004963 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08004964 * spp_assoc_id - (one-to-many style socket) This is filled in the
4965 * application, and identifies the association for
4966 * this query.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004967 * spp_address - This specifies which address is of interest.
4968 * spp_hbinterval - This contains the value of the heartbeat interval,
Frank Filz52ccb8e2005-12-22 11:36:46 -08004969 * in milliseconds. If a value of zero
4970 * is present in this field then no changes are to
4971 * be made to this parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004972 * spp_pathmaxrxt - This contains the maximum number of
4973 * retransmissions before this address shall be
Frank Filz52ccb8e2005-12-22 11:36:46 -08004974 * considered unreachable. If a value of zero
4975 * is present in this field then no changes are to
4976 * be made to this parameter.
4977 * spp_pathmtu - When Path MTU discovery is disabled the value
4978 * specified here will be the "fixed" path mtu.
4979 * Note that if the spp_address field is empty
4980 * then all associations on this address will
4981 * have this fixed path mtu set upon them.
4982 *
4983 * spp_sackdelay - When delayed sack is enabled, this value specifies
4984 * the number of milliseconds that sacks will be delayed
4985 * for. This value will apply to all addresses of an
4986 * association if the spp_address field is empty. Note
4987 * also, that if delayed sack is enabled and this
4988 * value is set to 0, no change is made to the last
4989 * recorded delayed sack timer value.
4990 *
4991 * spp_flags - These flags are used to control various features
4992 * on an association. The flag field may contain
4993 * zero or more of the following options.
4994 *
4995 * SPP_HB_ENABLE - Enable heartbeats on the
4996 * specified address. Note that if the address
4997 * field is empty all addresses for the association
4998 * have heartbeats enabled upon them.
4999 *
5000 * SPP_HB_DISABLE - Disable heartbeats on the
5001 * speicifed address. Note that if the address
5002 * field is empty all addresses for the association
5003 * will have their heartbeats disabled. Note also
5004 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5005 * mutually exclusive, only one of these two should
5006 * be specified. Enabling both fields will have
5007 * undetermined results.
5008 *
5009 * SPP_HB_DEMAND - Request a user initiated heartbeat
5010 * to be made immediately.
5011 *
5012 * SPP_PMTUD_ENABLE - This field will enable PMTU
5013 * discovery upon the specified address. Note that
5014 * if the address feild is empty then all addresses
5015 * on the association are effected.
5016 *
5017 * SPP_PMTUD_DISABLE - This field will disable PMTU
5018 * discovery upon the specified address. Note that
5019 * if the address feild is empty then all addresses
5020 * on the association are effected. Not also that
5021 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5022 * exclusive. Enabling both will have undetermined
5023 * results.
5024 *
5025 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5026 * on delayed sack. The time specified in spp_sackdelay
5027 * is used to specify the sack delay for this address. Note
5028 * that if spp_address is empty then all addresses will
5029 * enable delayed sack and take on the sack delay
5030 * value specified in spp_sackdelay.
5031 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5032 * off delayed sack. If the spp_address field is blank then
5033 * delayed sack is disabled for the entire association. Note
5034 * also that this field is mutually exclusive to
5035 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5036 * results.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005037 */
5038static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
Frank Filz52ccb8e2005-12-22 11:36:46 -08005039 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005040{
Frank Filz52ccb8e2005-12-22 11:36:46 -08005041 struct sctp_paddrparams params;
5042 struct sctp_transport *trans = NULL;
5043 struct sctp_association *asoc = NULL;
5044 struct sctp_sock *sp = sctp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005045
Neil Horman408f22e2007-06-16 14:03:45 -04005046 if (len < sizeof(struct sctp_paddrparams))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005047 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04005048 len = sizeof(struct sctp_paddrparams);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005049 if (copy_from_user(&params, optval, len))
5050 return -EFAULT;
5051
Frank Filz52ccb8e2005-12-22 11:36:46 -08005052 /* If an address other than INADDR_ANY is specified, and
5053 * no transport is found, then the request is invalid.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005054 */
wangweidongcb3f8372013-12-23 12:16:50 +08005055 if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08005056 trans = sctp_addr_id2transport(sk, &params.spp_address,
5057 params.spp_assoc_id);
5058 if (!trans) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02005059 pr_debug("%s: failed no transport\n", __func__);
Frank Filz52ccb8e2005-12-22 11:36:46 -08005060 return -EINVAL;
5061 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005062 }
5063
Frank Filz52ccb8e2005-12-22 11:36:46 -08005064 /* Get association, if assoc_id != 0 and the socket is a one
5065 * to many style socket, and an association was not found, then
5066 * the id was invalid.
5067 */
5068 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5069 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02005070 pr_debug("%s: failed no association\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005071 return -EINVAL;
Frank Filz52ccb8e2005-12-22 11:36:46 -08005072 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005073
Frank Filz52ccb8e2005-12-22 11:36:46 -08005074 if (trans) {
5075 /* Fetch transport values. */
5076 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5077 params.spp_pathmtu = trans->pathmtu;
5078 params.spp_pathmaxrxt = trans->pathmaxrxt;
5079 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005080
Frank Filz52ccb8e2005-12-22 11:36:46 -08005081 /*draft-11 doesn't say what to return in spp_flags*/
5082 params.spp_flags = trans->param_flags;
5083 } else if (asoc) {
5084 /* Fetch association values. */
5085 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5086 params.spp_pathmtu = asoc->pathmtu;
5087 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5088 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005089
Frank Filz52ccb8e2005-12-22 11:36:46 -08005090 /*draft-11 doesn't say what to return in spp_flags*/
5091 params.spp_flags = asoc->param_flags;
5092 } else {
5093 /* Fetch socket values. */
5094 params.spp_hbinterval = sp->hbinterval;
5095 params.spp_pathmtu = sp->pathmtu;
5096 params.spp_sackdelay = sp->sackdelay;
5097 params.spp_pathmaxrxt = sp->pathmaxrxt;
5098
5099 /*draft-11 doesn't say what to return in spp_flags*/
5100 params.spp_flags = sp->param_flags;
5101 }
5102
Linus Torvalds1da177e2005-04-16 15:20:36 -07005103 if (copy_to_user(optval, &params, len))
5104 return -EFAULT;
5105
5106 if (put_user(len, optlen))
5107 return -EFAULT;
5108
5109 return 0;
5110}
5111
Wei Yongjund364d922008-05-09 15:13:26 -07005112/*
5113 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
Frank Filz77086102005-12-22 11:37:30 -08005114 *
Wei Yongjund364d922008-05-09 15:13:26 -07005115 * This option will effect the way delayed acks are performed. This
5116 * option allows you to get or set the delayed ack time, in
5117 * milliseconds. It also allows changing the delayed ack frequency.
5118 * Changing the frequency to 1 disables the delayed sack algorithm. If
5119 * the assoc_id is 0, then this sets or gets the endpoints default
5120 * values. If the assoc_id field is non-zero, then the set or get
5121 * effects the specified association for the one to many model (the
5122 * assoc_id field is ignored by the one to one model). Note that if
5123 * sack_delay or sack_freq are 0 when setting this option, then the
5124 * current values will remain unchanged.
Frank Filz77086102005-12-22 11:37:30 -08005125 *
Wei Yongjund364d922008-05-09 15:13:26 -07005126 * struct sctp_sack_info {
5127 * sctp_assoc_t sack_assoc_id;
5128 * uint32_t sack_delay;
5129 * uint32_t sack_freq;
5130 * };
Frank Filz77086102005-12-22 11:37:30 -08005131 *
Wei Yongjund364d922008-05-09 15:13:26 -07005132 * sack_assoc_id - This parameter, indicates which association the user
5133 * is performing an action upon. Note that if this field's value is
5134 * zero then the endpoints default value is changed (effecting future
5135 * associations only).
Frank Filz77086102005-12-22 11:37:30 -08005136 *
Wei Yongjund364d922008-05-09 15:13:26 -07005137 * sack_delay - This parameter contains the number of milliseconds that
5138 * the user is requesting the delayed ACK timer be set to. Note that
5139 * this value is defined in the standard to be between 200 and 500
5140 * milliseconds.
Frank Filz77086102005-12-22 11:37:30 -08005141 *
Wei Yongjund364d922008-05-09 15:13:26 -07005142 * sack_freq - This parameter contains the number of packets that must
5143 * be received before a sack is sent without waiting for the delay
5144 * timer to expire. The default value for this is 2, setting this
5145 * value to 1 will disable the delayed sack algorithm.
Frank Filz77086102005-12-22 11:37:30 -08005146 */
Wei Yongjund364d922008-05-09 15:13:26 -07005147static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
Frank Filz77086102005-12-22 11:37:30 -08005148 char __user *optval,
5149 int __user *optlen)
5150{
Wei Yongjund364d922008-05-09 15:13:26 -07005151 struct sctp_sack_info params;
Frank Filz77086102005-12-22 11:37:30 -08005152 struct sctp_association *asoc = NULL;
5153 struct sctp_sock *sp = sctp_sk(sk);
5154
Wei Yongjund364d922008-05-09 15:13:26 -07005155 if (len >= sizeof(struct sctp_sack_info)) {
5156 len = sizeof(struct sctp_sack_info);
5157
5158 if (copy_from_user(&params, optval, len))
5159 return -EFAULT;
5160 } else if (len == sizeof(struct sctp_assoc_value)) {
Neil Horman94f65192013-12-23 08:29:43 -05005161 pr_warn_ratelimited(DEPRECATED
Neil Hormanf916ec92014-01-02 12:54:27 -05005162 "%s (pid %d) "
Neil Horman94f65192013-12-23 08:29:43 -05005163 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
Neil Hormanf916ec92014-01-02 12:54:27 -05005164 "Use struct sctp_sack_info instead\n",
5165 current->comm, task_pid_nr(current));
Wei Yongjund364d922008-05-09 15:13:26 -07005166 if (copy_from_user(&params, optval, len))
5167 return -EFAULT;
5168 } else
wangweidongcb3f8372013-12-23 12:16:50 +08005169 return -EINVAL;
Frank Filz77086102005-12-22 11:37:30 -08005170
Wei Yongjund364d922008-05-09 15:13:26 -07005171 /* Get association, if sack_assoc_id != 0 and the socket is a one
Frank Filz77086102005-12-22 11:37:30 -08005172 * to many style socket, and an association was not found, then
5173 * the id was invalid.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09005174 */
Wei Yongjund364d922008-05-09 15:13:26 -07005175 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5176 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
Frank Filz77086102005-12-22 11:37:30 -08005177 return -EINVAL;
5178
5179 if (asoc) {
5180 /* Fetch association values. */
Wei Yongjund364d922008-05-09 15:13:26 -07005181 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
5182 params.sack_delay = jiffies_to_msecs(
Frank Filz77086102005-12-22 11:37:30 -08005183 asoc->sackdelay);
Wei Yongjund364d922008-05-09 15:13:26 -07005184 params.sack_freq = asoc->sackfreq;
5185
5186 } else {
5187 params.sack_delay = 0;
5188 params.sack_freq = 1;
5189 }
Frank Filz77086102005-12-22 11:37:30 -08005190 } else {
5191 /* Fetch socket values. */
Wei Yongjund364d922008-05-09 15:13:26 -07005192 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
5193 params.sack_delay = sp->sackdelay;
5194 params.sack_freq = sp->sackfreq;
5195 } else {
5196 params.sack_delay = 0;
5197 params.sack_freq = 1;
5198 }
Frank Filz77086102005-12-22 11:37:30 -08005199 }
5200
5201 if (copy_to_user(optval, &params, len))
5202 return -EFAULT;
5203
5204 if (put_user(len, optlen))
5205 return -EFAULT;
5206
5207 return 0;
5208}
5209
Linus Torvalds1da177e2005-04-16 15:20:36 -07005210/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5211 *
5212 * Applications can specify protocol parameters for the default association
5213 * initialization. The option name argument to setsockopt() and getsockopt()
5214 * is SCTP_INITMSG.
5215 *
5216 * Setting initialization parameters is effective only on an unconnected
5217 * socket (for UDP-style sockets only future associations are effected
5218 * by the change). With TCP-style sockets, this option is inherited by
5219 * sockets derived from a listener socket.
5220 */
5221static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
5222{
Neil Horman408f22e2007-06-16 14:03:45 -04005223 if (len < sizeof(struct sctp_initmsg))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005224 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04005225 len = sizeof(struct sctp_initmsg);
5226 if (put_user(len, optlen))
5227 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005228 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
5229 return -EFAULT;
5230 return 0;
5231}
5232
Linus Torvalds1da177e2005-04-16 15:20:36 -07005233
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005234static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
5235 char __user *optval, int __user *optlen)
5236{
5237 struct sctp_association *asoc;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005238 int cnt = 0;
5239 struct sctp_getaddrs getaddrs;
5240 struct sctp_transport *from;
5241 void __user *to;
5242 union sctp_addr temp;
5243 struct sctp_sock *sp = sctp_sk(sk);
5244 int addrlen;
5245 size_t space_left;
5246 int bytes_copied;
5247
5248 if (len < sizeof(struct sctp_getaddrs))
5249 return -EINVAL;
5250
5251 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5252 return -EFAULT;
5253
5254 /* For UDP-style sockets, id specifies the association to query. */
5255 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5256 if (!asoc)
5257 return -EINVAL;
5258
wangweidongcb3f8372013-12-23 12:16:50 +08005259 to = optval + offsetof(struct sctp_getaddrs, addrs);
5260 space_left = len - offsetof(struct sctp_getaddrs, addrs);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005261
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07005262 list_for_each_entry(from, &asoc->peer.transport_addr_list,
5263 transports) {
Al Virob3f5b3b2006-11-20 17:22:43 -08005264 memcpy(&temp, &from->ipaddr, sizeof(temp));
Jason Gunthorpe299ee122014-07-30 12:40:53 -06005265 addrlen = sctp_get_pf_specific(sk->sk_family)
5266 ->addr_to_user(sp, &temp);
Vlad Yasevichaad97f32007-04-28 21:09:04 -07005267 if (space_left < addrlen)
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005268 return -ENOMEM;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005269 if (copy_to_user(to, &temp, addrlen))
5270 return -EFAULT;
5271 to += addrlen;
5272 cnt++;
5273 space_left -= addrlen;
5274 }
5275
5276 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
5277 return -EFAULT;
5278 bytes_copied = ((char __user *)to) - optval;
5279 if (put_user(bytes_copied, optlen))
5280 return -EFAULT;
5281
5282 return 0;
5283}
5284
Vlad Yasevichaad97f32007-04-28 21:09:04 -07005285static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
5286 size_t space_left, int *bytes_copied)
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005287{
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005288 struct sctp_sockaddr_entry *addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005289 union sctp_addr temp;
5290 int cnt = 0;
5291 int addrlen;
Eric W. Biederman4db67e82012-08-06 08:42:04 +00005292 struct net *net = sock_net(sk);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005293
Vlad Yasevich29303542007-09-16 16:02:12 -07005294 rcu_read_lock();
Eric W. Biederman4db67e82012-08-06 08:42:04 +00005295 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
Vlad Yasevich29303542007-09-16 16:02:12 -07005296 if (!addr->valid)
5297 continue;
5298
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09005299 if ((PF_INET == sk->sk_family) &&
Al Viro6244be42006-11-20 17:21:44 -08005300 (AF_INET6 == addr->a.sa.sa_family))
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005301 continue;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07005302 if ((PF_INET6 == sk->sk_family) &&
5303 inet_v6_ipv6only(sk) &&
5304 (AF_INET == addr->a.sa.sa_family))
5305 continue;
Al Viro6244be42006-11-20 17:21:44 -08005306 memcpy(&temp, &addr->a, sizeof(temp));
Vlad Yasevichb46ae362008-01-28 14:25:36 -05005307 if (!temp.v4.sin_port)
5308 temp.v4.sin_port = htons(port);
5309
Jason Gunthorpe299ee122014-07-30 12:40:53 -06005310 addrlen = sctp_get_pf_specific(sk->sk_family)
5311 ->addr_to_user(sctp_sk(sk), &temp);
5312
Vlad Yasevich29303542007-09-16 16:02:12 -07005313 if (space_left < addrlen) {
5314 cnt = -ENOMEM;
5315 break;
5316 }
Vlad Yasevichaad97f32007-04-28 21:09:04 -07005317 memcpy(to, &temp, addrlen);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -08005318
Vlad Yasevichaad97f32007-04-28 21:09:04 -07005319 to += addrlen;
wangweidongcb3f8372013-12-23 12:16:50 +08005320 cnt++;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005321 space_left -= addrlen;
Vlad Yasevich3663c302007-07-03 12:43:12 -04005322 *bytes_copied += addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005323 }
Vlad Yasevich29303542007-09-16 16:02:12 -07005324 rcu_read_unlock();
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005325
5326 return cnt;
5327}
5328
Linus Torvalds1da177e2005-04-16 15:20:36 -07005329
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005330static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
5331 char __user *optval, int __user *optlen)
5332{
5333 struct sctp_bind_addr *bp;
5334 struct sctp_association *asoc;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005335 int cnt = 0;
5336 struct sctp_getaddrs getaddrs;
5337 struct sctp_sockaddr_entry *addr;
5338 void __user *to;
5339 union sctp_addr temp;
5340 struct sctp_sock *sp = sctp_sk(sk);
5341 int addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005342 int err = 0;
5343 size_t space_left;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07005344 int bytes_copied = 0;
5345 void *addrs;
Vlad Yasevich70b57b82007-05-09 13:51:31 -07005346 void *buf;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005347
Neil Horman408f22e2007-06-16 14:03:45 -04005348 if (len < sizeof(struct sctp_getaddrs))
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005349 return -EINVAL;
5350
5351 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5352 return -EFAULT;
5353
5354 /*
5355 * For UDP-style sockets, id specifies the association to query.
5356 * If the id field is set to the value '0' then the locally bound
5357 * addresses are returned without regard to any particular
5358 * association.
5359 */
5360 if (0 == getaddrs.assoc_id) {
5361 bp = &sctp_sk(sk)->ep->base.bind_addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005362 } else {
5363 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5364 if (!asoc)
5365 return -EINVAL;
5366 bp = &asoc->base.bind_addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005367 }
5368
wangweidongcb3f8372013-12-23 12:16:50 +08005369 to = optval + offsetof(struct sctp_getaddrs, addrs);
5370 space_left = len - offsetof(struct sctp_getaddrs, addrs);
Neil Horman186e2342007-06-18 19:59:16 -04005371
Marcelo Ricardo Leitnercacc0622015-11-30 14:32:54 -02005372 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
Vlad Yasevichaad97f32007-04-28 21:09:04 -07005373 if (!addrs)
5374 return -ENOMEM;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005375
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005376 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5377 * addresses from the global local address list.
5378 */
5379 if (sctp_list_single_entry(&bp->address_list)) {
5380 addr = list_entry(bp->address_list.next,
5381 struct sctp_sockaddr_entry, list);
Vlad Yasevich52cae8f2008-08-18 10:34:34 -04005382 if (sctp_is_any(sk, &addr->a)) {
Vlad Yasevichaad97f32007-04-28 21:09:04 -07005383 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
5384 space_left, &bytes_copied);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005385 if (cnt < 0) {
5386 err = cnt;
Vlad Yasevich559cf712007-09-16 16:03:28 -07005387 goto out;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005388 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09005389 goto copy_getaddrs;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005390 }
5391 }
5392
Vlad Yasevich70b57b82007-05-09 13:51:31 -07005393 buf = addrs;
Vlad Yasevich559cf712007-09-16 16:03:28 -07005394 /* Protection on the bound address list is not needed since
5395 * in the socket option context we hold a socket lock and
5396 * thus the bound address list can't change.
5397 */
5398 list_for_each_entry(addr, &bp->address_list, list) {
Al Viro6244be42006-11-20 17:21:44 -08005399 memcpy(&temp, &addr->a, sizeof(temp));
Jason Gunthorpe299ee122014-07-30 12:40:53 -06005400 addrlen = sctp_get_pf_specific(sk->sk_family)
5401 ->addr_to_user(sp, &temp);
Vlad Yasevichaad97f32007-04-28 21:09:04 -07005402 if (space_left < addrlen) {
5403 err = -ENOMEM; /*fixme: right error?*/
Vlad Yasevich559cf712007-09-16 16:03:28 -07005404 goto out;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005405 }
Vlad Yasevich70b57b82007-05-09 13:51:31 -07005406 memcpy(buf, &temp, addrlen);
5407 buf += addrlen;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07005408 bytes_copied += addrlen;
wangweidongcb3f8372013-12-23 12:16:50 +08005409 cnt++;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005410 space_left -= addrlen;
5411 }
5412
5413copy_getaddrs:
Vlad Yasevichaad97f32007-04-28 21:09:04 -07005414 if (copy_to_user(to, addrs, bytes_copied)) {
5415 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02005416 goto out;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07005417 }
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04005418 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
5419 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02005420 goto out;
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04005421 }
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005422 if (put_user(bytes_copied, optlen))
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04005423 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02005424out:
Vlad Yasevichaad97f32007-04-28 21:09:04 -07005425 kfree(addrs);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07005426 return err;
5427}
5428
Linus Torvalds1da177e2005-04-16 15:20:36 -07005429/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5430 *
5431 * Requests that the local SCTP stack use the enclosed peer address as
5432 * the association primary. The enclosed address must be one of the
5433 * association peer's addresses.
5434 */
5435static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
5436 char __user *optval, int __user *optlen)
5437{
5438 struct sctp_prim prim;
5439 struct sctp_association *asoc;
5440 struct sctp_sock *sp = sctp_sk(sk);
5441
Neil Horman408f22e2007-06-16 14:03:45 -04005442 if (len < sizeof(struct sctp_prim))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005443 return -EINVAL;
5444
Neil Horman408f22e2007-06-16 14:03:45 -04005445 len = sizeof(struct sctp_prim);
5446
5447 if (copy_from_user(&prim, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005448 return -EFAULT;
5449
5450 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5451 if (!asoc)
5452 return -EINVAL;
5453
5454 if (!asoc->peer.primary_path)
5455 return -ENOTCONN;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09005456
Al Viro8cec6b82006-11-20 17:23:01 -08005457 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5458 asoc->peer.primary_path->af_specific->sockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005459
Jason Gunthorpe299ee122014-07-30 12:40:53 -06005460 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005461 (union sctp_addr *)&prim.ssp_addr);
5462
Neil Horman408f22e2007-06-16 14:03:45 -04005463 if (put_user(len, optlen))
5464 return -EFAULT;
5465 if (copy_to_user(optval, &prim, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005466 return -EFAULT;
5467
5468 return 0;
5469}
5470
5471/*
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08005472 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005473 *
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08005474 * Requests that the local endpoint set the specified Adaptation Layer
Linus Torvalds1da177e2005-04-16 15:20:36 -07005475 * Indication parameter for all future INIT and INIT-ACK exchanges.
5476 */
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08005477static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005478 char __user *optval, int __user *optlen)
5479{
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08005480 struct sctp_setadaptation adaptation;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005481
Neil Horman408f22e2007-06-16 14:03:45 -04005482 if (len < sizeof(struct sctp_setadaptation))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005483 return -EINVAL;
5484
Neil Horman408f22e2007-06-16 14:03:45 -04005485 len = sizeof(struct sctp_setadaptation);
5486
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08005487 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
Neil Horman408f22e2007-06-16 14:03:45 -04005488
5489 if (put_user(len, optlen))
5490 return -EFAULT;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08005491 if (copy_to_user(optval, &adaptation, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005492 return -EFAULT;
Ivan Skytte Jorgensena1ab3582005-10-28 15:33:24 -07005493
Linus Torvalds1da177e2005-04-16 15:20:36 -07005494 return 0;
5495}
5496
5497/*
5498 *
5499 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5500 *
5501 * Applications that wish to use the sendto() system call may wish to
5502 * specify a default set of parameters that would normally be supplied
5503 * through the inclusion of ancillary data. This socket option allows
5504 * such an application to set the default sctp_sndrcvinfo structure.
5505
5506
5507 * The application that wishes to use this socket option simply passes
5508 * in to this call the sctp_sndrcvinfo structure defined in Section
5509 * 5.2.2) The input parameters accepted by this call include
5510 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5511 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5512 * to this call if the caller is using the UDP model.
5513 *
5514 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5515 */
5516static int sctp_getsockopt_default_send_param(struct sock *sk,
5517 int len, char __user *optval,
5518 int __user *optlen)
5519{
Linus Torvalds1da177e2005-04-16 15:20:36 -07005520 struct sctp_sock *sp = sctp_sk(sk);
Geir Ola Vaagland6b3fd5f2014-07-12 20:30:39 +02005521 struct sctp_association *asoc;
5522 struct sctp_sndrcvinfo info;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005523
Geir Ola Vaagland6b3fd5f2014-07-12 20:30:39 +02005524 if (len < sizeof(info))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005525 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04005526
Geir Ola Vaagland6b3fd5f2014-07-12 20:30:39 +02005527 len = sizeof(info);
Neil Horman408f22e2007-06-16 14:03:45 -04005528
5529 if (copy_from_user(&info, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005530 return -EFAULT;
5531
5532 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5533 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5534 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005535 if (asoc) {
5536 info.sinfo_stream = asoc->default_stream;
5537 info.sinfo_flags = asoc->default_flags;
5538 info.sinfo_ppid = asoc->default_ppid;
5539 info.sinfo_context = asoc->default_context;
5540 info.sinfo_timetolive = asoc->default_timetolive;
5541 } else {
5542 info.sinfo_stream = sp->default_stream;
5543 info.sinfo_flags = sp->default_flags;
5544 info.sinfo_ppid = sp->default_ppid;
5545 info.sinfo_context = sp->default_context;
5546 info.sinfo_timetolive = sp->default_timetolive;
5547 }
5548
Neil Horman408f22e2007-06-16 14:03:45 -04005549 if (put_user(len, optlen))
5550 return -EFAULT;
5551 if (copy_to_user(optval, &info, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005552 return -EFAULT;
5553
5554 return 0;
5555}
5556
Geir Ola Vaagland6b3fd5f2014-07-12 20:30:39 +02005557/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5558 * (SCTP_DEFAULT_SNDINFO)
5559 */
5560static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5561 char __user *optval,
5562 int __user *optlen)
5563{
5564 struct sctp_sock *sp = sctp_sk(sk);
5565 struct sctp_association *asoc;
5566 struct sctp_sndinfo info;
5567
5568 if (len < sizeof(info))
5569 return -EINVAL;
5570
5571 len = sizeof(info);
5572
5573 if (copy_from_user(&info, optval, len))
5574 return -EFAULT;
5575
5576 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5577 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5578 return -EINVAL;
5579 if (asoc) {
5580 info.snd_sid = asoc->default_stream;
5581 info.snd_flags = asoc->default_flags;
5582 info.snd_ppid = asoc->default_ppid;
5583 info.snd_context = asoc->default_context;
5584 } else {
5585 info.snd_sid = sp->default_stream;
5586 info.snd_flags = sp->default_flags;
5587 info.snd_ppid = sp->default_ppid;
5588 info.snd_context = sp->default_context;
5589 }
5590
5591 if (put_user(len, optlen))
5592 return -EFAULT;
5593 if (copy_to_user(optval, &info, len))
5594 return -EFAULT;
5595
5596 return 0;
5597}
5598
Linus Torvalds1da177e2005-04-16 15:20:36 -07005599/*
5600 *
5601 * 7.1.5 SCTP_NODELAY
5602 *
5603 * Turn on/off any Nagle-like algorithm. This means that packets are
5604 * generally sent as soon as possible and no unnecessary delays are
5605 * introduced, at the cost of more packets in the network. Expects an
5606 * integer boolean flag.
5607 */
5608
5609static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5610 char __user *optval, int __user *optlen)
5611{
5612 int val;
5613
5614 if (len < sizeof(int))
5615 return -EINVAL;
5616
5617 len = sizeof(int);
5618 val = (sctp_sk(sk)->nodelay == 1);
5619 if (put_user(len, optlen))
5620 return -EFAULT;
5621 if (copy_to_user(optval, &val, len))
5622 return -EFAULT;
5623 return 0;
5624}
5625
5626/*
5627 *
5628 * 7.1.1 SCTP_RTOINFO
5629 *
5630 * The protocol parameters used to initialize and bound retransmission
5631 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5632 * and modify these parameters.
5633 * All parameters are time values, in milliseconds. A value of 0, when
5634 * modifying the parameters, indicates that the current value should not
5635 * be changed.
5636 *
5637 */
5638static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5639 char __user *optval,
5640 int __user *optlen) {
5641 struct sctp_rtoinfo rtoinfo;
5642 struct sctp_association *asoc;
5643
Neil Horman408f22e2007-06-16 14:03:45 -04005644 if (len < sizeof (struct sctp_rtoinfo))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005645 return -EINVAL;
5646
Neil Horman408f22e2007-06-16 14:03:45 -04005647 len = sizeof(struct sctp_rtoinfo);
5648
5649 if (copy_from_user(&rtoinfo, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005650 return -EFAULT;
5651
5652 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5653
5654 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5655 return -EINVAL;
5656
5657 /* Values corresponding to the specific association. */
5658 if (asoc) {
5659 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5660 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5661 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5662 } else {
5663 /* Values corresponding to the endpoint. */
5664 struct sctp_sock *sp = sctp_sk(sk);
5665
5666 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5667 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5668 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5669 }
5670
5671 if (put_user(len, optlen))
5672 return -EFAULT;
5673
5674 if (copy_to_user(optval, &rtoinfo, len))
5675 return -EFAULT;
5676
5677 return 0;
5678}
5679
5680/*
5681 *
5682 * 7.1.2 SCTP_ASSOCINFO
5683 *
Michael Opdenacker59c51592007-05-09 08:57:56 +02005684 * This option is used to tune the maximum retransmission attempts
Linus Torvalds1da177e2005-04-16 15:20:36 -07005685 * of the association.
5686 * Returns an error if the new association retransmission value is
5687 * greater than the sum of the retransmission value of the peer.
5688 * See [SCTP] for more information.
5689 *
5690 */
5691static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5692 char __user *optval,
5693 int __user *optlen)
5694{
5695
5696 struct sctp_assocparams assocparams;
5697 struct sctp_association *asoc;
5698 struct list_head *pos;
5699 int cnt = 0;
5700
Neil Horman408f22e2007-06-16 14:03:45 -04005701 if (len < sizeof (struct sctp_assocparams))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005702 return -EINVAL;
5703
Neil Horman408f22e2007-06-16 14:03:45 -04005704 len = sizeof(struct sctp_assocparams);
5705
5706 if (copy_from_user(&assocparams, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005707 return -EFAULT;
5708
5709 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5710
5711 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5712 return -EINVAL;
5713
5714 /* Values correspoinding to the specific association */
Vladislav Yasevich17337212005-04-28 11:57:54 -07005715 if (asoc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005716 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5717 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5718 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
Daniel Borkmann52db8822013-06-25 18:17:27 +02005719 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005720
5721 list_for_each(pos, &asoc->peer.transport_addr_list) {
wangweidongcb3f8372013-12-23 12:16:50 +08005722 cnt++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005723 }
5724
5725 assocparams.sasoc_number_peer_destinations = cnt;
5726 } else {
5727 /* Values corresponding to the endpoint */
5728 struct sctp_sock *sp = sctp_sk(sk);
5729
5730 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5731 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5732 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5733 assocparams.sasoc_cookie_life =
5734 sp->assocparams.sasoc_cookie_life;
5735 assocparams.sasoc_number_peer_destinations =
5736 sp->assocparams.
5737 sasoc_number_peer_destinations;
5738 }
5739
5740 if (put_user(len, optlen))
5741 return -EFAULT;
5742
5743 if (copy_to_user(optval, &assocparams, len))
5744 return -EFAULT;
5745
5746 return 0;
5747}
5748
5749/*
5750 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5751 *
5752 * This socket option is a boolean flag which turns on or off mapped V4
5753 * addresses. If this option is turned on and the socket is type
5754 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5755 * If this option is turned off, then no mapping will be done of V4
5756 * addresses and a user will receive both PF_INET6 and PF_INET type
5757 * addresses on the socket.
5758 */
5759static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5760 char __user *optval, int __user *optlen)
5761{
5762 int val;
5763 struct sctp_sock *sp = sctp_sk(sk);
5764
5765 if (len < sizeof(int))
5766 return -EINVAL;
5767
5768 len = sizeof(int);
5769 val = sp->v4mapped;
5770 if (put_user(len, optlen))
5771 return -EFAULT;
5772 if (copy_to_user(optval, &val, len))
5773 return -EFAULT;
5774
5775 return 0;
5776}
5777
5778/*
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005779 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5780 * (chapter and verse is quoted at sctp_setsockopt_context())
5781 */
5782static int sctp_getsockopt_context(struct sock *sk, int len,
5783 char __user *optval, int __user *optlen)
5784{
5785 struct sctp_assoc_value params;
5786 struct sctp_sock *sp;
5787 struct sctp_association *asoc;
5788
Neil Horman408f22e2007-06-16 14:03:45 -04005789 if (len < sizeof(struct sctp_assoc_value))
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005790 return -EINVAL;
5791
Neil Horman408f22e2007-06-16 14:03:45 -04005792 len = sizeof(struct sctp_assoc_value);
5793
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005794 if (copy_from_user(&params, optval, len))
5795 return -EFAULT;
5796
5797 sp = sctp_sk(sk);
5798
5799 if (params.assoc_id != 0) {
5800 asoc = sctp_id2assoc(sk, params.assoc_id);
5801 if (!asoc)
5802 return -EINVAL;
5803 params.assoc_value = asoc->default_rcv_context;
5804 } else {
5805 params.assoc_value = sp->default_rcv_context;
5806 }
5807
5808 if (put_user(len, optlen))
5809 return -EFAULT;
5810 if (copy_to_user(optval, &params, len))
5811 return -EFAULT;
5812
5813 return 0;
5814}
5815
5816/*
Wei Yongjune89c2092008-12-25 16:54:58 -08005817 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5818 * This option will get or set the maximum size to put in any outgoing
5819 * SCTP DATA chunk. If a message is larger than this size it will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07005820 * fragmented by SCTP into the specified size. Note that the underlying
5821 * SCTP implementation may fragment into smaller sized chunks when the
5822 * PMTU of the underlying association is smaller than the value set by
Wei Yongjune89c2092008-12-25 16:54:58 -08005823 * the user. The default value for this option is '0' which indicates
5824 * the user is NOT limiting fragmentation and only the PMTU will effect
5825 * SCTP's choice of DATA chunk size. Note also that values set larger
5826 * than the maximum size of an IP datagram will effectively let SCTP
5827 * control fragmentation (i.e. the same as setting this option to 0).
5828 *
5829 * The following structure is used to access and modify this parameter:
5830 *
5831 * struct sctp_assoc_value {
5832 * sctp_assoc_t assoc_id;
5833 * uint32_t assoc_value;
5834 * };
5835 *
5836 * assoc_id: This parameter is ignored for one-to-one style sockets.
5837 * For one-to-many style sockets this parameter indicates which
5838 * association the user is performing an action upon. Note that if
5839 * this field's value is zero then the endpoints default value is
5840 * changed (effecting future associations only).
5841 * assoc_value: This parameter specifies the maximum size in bytes.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005842 */
5843static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5844 char __user *optval, int __user *optlen)
5845{
Wei Yongjune89c2092008-12-25 16:54:58 -08005846 struct sctp_assoc_value params;
5847 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005848
Wei Yongjune89c2092008-12-25 16:54:58 -08005849 if (len == sizeof(int)) {
Neil Horman94f65192013-12-23 08:29:43 -05005850 pr_warn_ratelimited(DEPRECATED
Neil Hormanf916ec92014-01-02 12:54:27 -05005851 "%s (pid %d) "
Neil Horman94f65192013-12-23 08:29:43 -05005852 "Use of int in maxseg socket option.\n"
Neil Hormanf916ec92014-01-02 12:54:27 -05005853 "Use struct sctp_assoc_value instead\n",
5854 current->comm, task_pid_nr(current));
Wei Yongjune89c2092008-12-25 16:54:58 -08005855 params.assoc_id = 0;
5856 } else if (len >= sizeof(struct sctp_assoc_value)) {
5857 len = sizeof(struct sctp_assoc_value);
5858 if (copy_from_user(&params, optval, sizeof(params)))
5859 return -EFAULT;
5860 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07005861 return -EINVAL;
5862
Wei Yongjune89c2092008-12-25 16:54:58 -08005863 asoc = sctp_id2assoc(sk, params.assoc_id);
5864 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5865 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005866
Wei Yongjune89c2092008-12-25 16:54:58 -08005867 if (asoc)
5868 params.assoc_value = asoc->frag_point;
5869 else
5870 params.assoc_value = sctp_sk(sk)->user_frag;
5871
Linus Torvalds1da177e2005-04-16 15:20:36 -07005872 if (put_user(len, optlen))
5873 return -EFAULT;
Wei Yongjune89c2092008-12-25 16:54:58 -08005874 if (len == sizeof(int)) {
5875 if (copy_to_user(optval, &params.assoc_value, len))
5876 return -EFAULT;
5877 } else {
5878 if (copy_to_user(optval, &params, len))
5879 return -EFAULT;
5880 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005881
5882 return 0;
5883}
5884
Vlad Yasevichb6e13312007-04-20 12:23:15 -07005885/*
5886 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5887 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5888 */
5889static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5890 char __user *optval, int __user *optlen)
5891{
5892 int val;
5893
5894 if (len < sizeof(int))
5895 return -EINVAL;
5896
5897 len = sizeof(int);
5898
5899 val = sctp_sk(sk)->frag_interleave;
5900 if (put_user(len, optlen))
5901 return -EFAULT;
5902 if (copy_to_user(optval, &val, len))
5903 return -EFAULT;
5904
5905 return 0;
5906}
5907
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005908/*
5909 * 7.1.25. Set or Get the sctp partial delivery point
5910 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5911 */
5912static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5913 char __user *optval,
5914 int __user *optlen)
5915{
YOSHIFUJI Hideaki9cbcbf42007-07-19 10:44:50 +09005916 u32 val;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005917
5918 if (len < sizeof(u32))
5919 return -EINVAL;
5920
5921 len = sizeof(u32);
5922
5923 val = sctp_sk(sk)->pd_point;
5924 if (put_user(len, optlen))
5925 return -EFAULT;
5926 if (copy_to_user(optval, &val, len))
5927 return -EFAULT;
5928
Wei Yongjun7d743b72010-12-14 16:10:41 +00005929 return 0;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005930}
5931
Vlad Yasevich70331572007-03-23 11:34:36 -07005932/*
5933 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5934 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5935 */
5936static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5937 char __user *optval,
5938 int __user *optlen)
5939{
Neil Horman219b99a2008-03-05 13:44:46 -08005940 struct sctp_assoc_value params;
5941 struct sctp_sock *sp;
5942 struct sctp_association *asoc;
Vlad Yasevich70331572007-03-23 11:34:36 -07005943
Neil Horman219b99a2008-03-05 13:44:46 -08005944 if (len == sizeof(int)) {
Neil Horman94f65192013-12-23 08:29:43 -05005945 pr_warn_ratelimited(DEPRECATED
Neil Hormanf916ec92014-01-02 12:54:27 -05005946 "%s (pid %d) "
Neil Horman94f65192013-12-23 08:29:43 -05005947 "Use of int in max_burst socket option.\n"
Neil Hormanf916ec92014-01-02 12:54:27 -05005948 "Use struct sctp_assoc_value instead\n",
5949 current->comm, task_pid_nr(current));
Neil Horman219b99a2008-03-05 13:44:46 -08005950 params.assoc_id = 0;
Wei Yongjunc6db93a2009-03-02 09:46:12 +00005951 } else if (len >= sizeof(struct sctp_assoc_value)) {
5952 len = sizeof(struct sctp_assoc_value);
Neil Horman219b99a2008-03-05 13:44:46 -08005953 if (copy_from_user(&params, optval, len))
5954 return -EFAULT;
5955 } else
5956 return -EINVAL;
Vlad Yasevich70331572007-03-23 11:34:36 -07005957
Neil Horman219b99a2008-03-05 13:44:46 -08005958 sp = sctp_sk(sk);
Vlad Yasevich70331572007-03-23 11:34:36 -07005959
Neil Horman219b99a2008-03-05 13:44:46 -08005960 if (params.assoc_id != 0) {
5961 asoc = sctp_id2assoc(sk, params.assoc_id);
5962 if (!asoc)
5963 return -EINVAL;
5964 params.assoc_value = asoc->max_burst;
5965 } else
5966 params.assoc_value = sp->max_burst;
5967
5968 if (len == sizeof(int)) {
5969 if (copy_to_user(optval, &params.assoc_value, len))
5970 return -EFAULT;
5971 } else {
5972 if (copy_to_user(optval, &params, len))
5973 return -EFAULT;
5974 }
5975
5976 return 0;
5977
Vlad Yasevich70331572007-03-23 11:34:36 -07005978}
5979
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005980static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5981 char __user *optval, int __user *optlen)
5982{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005983 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005984 struct sctp_hmacalgo __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005985 struct sctp_hmac_algo_param *hmacs;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005986 __u16 data_len = 0;
5987 u32 num_idents;
Xin Long7a84bd42016-02-03 23:33:30 +08005988 int i;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005989
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005990 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005991 return -EACCES;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005992
Vlad Yasevichb14878c2014-04-17 17:26:50 +02005993 hmacs = ep->auth_hmacs_list;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005994 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005995
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005996 if (len < sizeof(struct sctp_hmacalgo) + data_len)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005997 return -EINVAL;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005998
5999 len = sizeof(struct sctp_hmacalgo) + data_len;
6000 num_idents = data_len / sizeof(u16);
6001
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006002 if (put_user(len, optlen))
6003 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006004 if (put_user(num_idents, &p->shmac_num_idents))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006005 return -EFAULT;
Xin Long7a84bd42016-02-03 23:33:30 +08006006 for (i = 0; i < num_idents; i++) {
6007 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6008
6009 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6010 return -EFAULT;
6011 }
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006012 return 0;
6013}
6014
6015static int sctp_getsockopt_active_key(struct sock *sk, int len,
6016 char __user *optval, int __user *optlen)
6017{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02006018 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006019 struct sctp_authkeyid val;
6020 struct sctp_association *asoc;
6021
Vlad Yasevichb14878c2014-04-17 17:26:50 +02006022 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006023 return -EACCES;
6024
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006025 if (len < sizeof(struct sctp_authkeyid))
6026 return -EINVAL;
6027 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
6028 return -EFAULT;
6029
6030 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6031 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6032 return -EINVAL;
6033
6034 if (asoc)
6035 val.scact_keynumber = asoc->active_key_id;
6036 else
Vlad Yasevichb14878c2014-04-17 17:26:50 +02006037 val.scact_keynumber = ep->active_key_id;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006038
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006039 len = sizeof(struct sctp_authkeyid);
6040 if (put_user(len, optlen))
6041 return -EFAULT;
6042 if (copy_to_user(optval, &val, len))
6043 return -EFAULT;
6044
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006045 return 0;
6046}
6047
6048static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6049 char __user *optval, int __user *optlen)
6050{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02006051 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Al Viro411223c2007-10-14 19:21:20 +01006052 struct sctp_authchunks __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006053 struct sctp_authchunks val;
6054 struct sctp_association *asoc;
6055 struct sctp_chunks_param *ch;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006056 u32 num_chunks = 0;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006057 char __user *to;
6058
Vlad Yasevichb14878c2014-04-17 17:26:50 +02006059 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006060 return -EACCES;
6061
6062 if (len < sizeof(struct sctp_authchunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006063 return -EINVAL;
6064
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006065 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006066 return -EFAULT;
6067
Al Viro411223c2007-10-14 19:21:20 +01006068 to = p->gauth_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006069 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6070 if (!asoc)
6071 return -EINVAL;
6072
6073 ch = asoc->peer.peer_chunks;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006074 if (!ch)
6075 goto num;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006076
6077 /* See if the user provided enough room for all the data */
Vlad Yasevichb40db682008-02-27 14:40:37 -05006078 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
6079 if (len < num_chunks)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006080 return -EINVAL;
6081
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006082 if (copy_to_user(to, ch->chunks, num_chunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006083 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006084num:
6085 len = sizeof(struct sctp_authchunks) + num_chunks;
wangweidong8d726512013-12-23 12:16:53 +08006086 if (put_user(len, optlen))
6087 return -EFAULT;
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05006088 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6089 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006090 return 0;
6091}
6092
6093static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6094 char __user *optval, int __user *optlen)
6095{
Vlad Yasevichb14878c2014-04-17 17:26:50 +02006096 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
Al Viro411223c2007-10-14 19:21:20 +01006097 struct sctp_authchunks __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006098 struct sctp_authchunks val;
6099 struct sctp_association *asoc;
6100 struct sctp_chunks_param *ch;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006101 u32 num_chunks = 0;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006102 char __user *to;
6103
Vlad Yasevichb14878c2014-04-17 17:26:50 +02006104 if (!ep->auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006105 return -EACCES;
6106
6107 if (len < sizeof(struct sctp_authchunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006108 return -EINVAL;
6109
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006110 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006111 return -EFAULT;
6112
Al Viro411223c2007-10-14 19:21:20 +01006113 to = p->gauth_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006114 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6115 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
6116 return -EINVAL;
6117
6118 if (asoc)
wangweidong26ac8e52013-12-23 12:16:51 +08006119 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006120 else
Vlad Yasevichb14878c2014-04-17 17:26:50 +02006121 ch = ep->auth_chunk_list;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006122
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006123 if (!ch)
6124 goto num;
6125
Vlad Yasevichb40db682008-02-27 14:40:37 -05006126 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006127 if (len < sizeof(struct sctp_authchunks) + num_chunks)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006128 return -EINVAL;
6129
Vlad Yasevich5e739d12008-08-21 03:34:25 -07006130 if (copy_to_user(to, ch->chunks, num_chunks))
6131 return -EFAULT;
6132num:
6133 len = sizeof(struct sctp_authchunks) + num_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006134 if (put_user(len, optlen))
6135 return -EFAULT;
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05006136 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6137 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006138
6139 return 0;
6140}
6141
Wei Yongjunaea3c5c2008-12-25 16:57:24 -08006142/*
6143 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6144 * This option gets the current number of associations that are attached
6145 * to a one-to-many style socket. The option value is an uint32_t.
6146 */
6147static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
6148 char __user *optval, int __user *optlen)
6149{
6150 struct sctp_sock *sp = sctp_sk(sk);
6151 struct sctp_association *asoc;
6152 u32 val = 0;
6153
6154 if (sctp_style(sk, TCP))
6155 return -EOPNOTSUPP;
6156
6157 if (len < sizeof(u32))
6158 return -EINVAL;
6159
6160 len = sizeof(u32);
6161
6162 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6163 val++;
6164 }
6165
6166 if (put_user(len, optlen))
6167 return -EFAULT;
6168 if (copy_to_user(optval, &val, len))
6169 return -EFAULT;
6170
6171 return 0;
6172}
6173
Wei Yongjun209ba422011-04-17 17:27:08 +00006174/*
Michio Honda7dc04d72011-04-26 20:16:31 +09006175 * 8.1.23 SCTP_AUTO_ASCONF
6176 * See the corresponding setsockopt entry as description
6177 */
6178static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
6179 char __user *optval, int __user *optlen)
6180{
6181 int val = 0;
6182
6183 if (len < sizeof(int))
6184 return -EINVAL;
6185
6186 len = sizeof(int);
6187 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
6188 val = 1;
6189 if (put_user(len, optlen))
6190 return -EFAULT;
6191 if (copy_to_user(optval, &val, len))
6192 return -EFAULT;
6193 return 0;
6194}
6195
6196/*
Wei Yongjun209ba422011-04-17 17:27:08 +00006197 * 8.2.6. Get the Current Identifiers of Associations
6198 * (SCTP_GET_ASSOC_ID_LIST)
6199 *
6200 * This option gets the current list of SCTP association identifiers of
6201 * the SCTP associations handled by a one-to-many style socket.
6202 */
6203static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
6204 char __user *optval, int __user *optlen)
6205{
6206 struct sctp_sock *sp = sctp_sk(sk);
6207 struct sctp_association *asoc;
6208 struct sctp_assoc_ids *ids;
6209 u32 num = 0;
6210
6211 if (sctp_style(sk, TCP))
6212 return -EOPNOTSUPP;
6213
6214 if (len < sizeof(struct sctp_assoc_ids))
6215 return -EINVAL;
6216
6217 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6218 num++;
6219 }
6220
6221 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
6222 return -EINVAL;
6223
6224 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
6225
Marcelo Ricardo Leitner9ba0b962015-12-23 16:28:40 -02006226 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
Wei Yongjun209ba422011-04-17 17:27:08 +00006227 if (unlikely(!ids))
6228 return -ENOMEM;
6229
6230 ids->gaids_number_of_ids = num;
6231 num = 0;
6232 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6233 ids->gaids_assoc_id[num++] = asoc->assoc_id;
6234 }
6235
6236 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
6237 kfree(ids);
6238 return -EFAULT;
6239 }
6240
6241 kfree(ids);
6242 return 0;
6243}
6244
Neil Horman5aa93bc2012-07-21 07:56:07 +00006245/*
6246 * SCTP_PEER_ADDR_THLDS
6247 *
6248 * This option allows us to fetch the partially failed threshold for one or all
6249 * transports in an association. See Section 6.1 of:
6250 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6251 */
6252static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
6253 char __user *optval,
6254 int len,
6255 int __user *optlen)
6256{
6257 struct sctp_paddrthlds val;
6258 struct sctp_transport *trans;
6259 struct sctp_association *asoc;
6260
6261 if (len < sizeof(struct sctp_paddrthlds))
6262 return -EINVAL;
6263 len = sizeof(struct sctp_paddrthlds);
6264 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
6265 return -EFAULT;
6266
6267 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
6268 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
6269 if (!asoc)
6270 return -ENOENT;
6271
6272 val.spt_pathpfthld = asoc->pf_retrans;
6273 val.spt_pathmaxrxt = asoc->pathmaxrxt;
6274 } else {
6275 trans = sctp_addr_id2transport(sk, &val.spt_address,
6276 val.spt_assoc_id);
6277 if (!trans)
6278 return -ENOENT;
6279
6280 val.spt_pathmaxrxt = trans->pathmaxrxt;
6281 val.spt_pathpfthld = trans->pf_retrans;
6282 }
6283
6284 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
6285 return -EFAULT;
6286
6287 return 0;
6288}
6289
Michele Baldessari196d6752012-12-01 04:49:42 +00006290/*
6291 * SCTP_GET_ASSOC_STATS
6292 *
6293 * This option retrieves local per endpoint statistics. It is modeled
6294 * after OpenSolaris' implementation
6295 */
6296static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
6297 char __user *optval,
6298 int __user *optlen)
6299{
6300 struct sctp_assoc_stats sas;
6301 struct sctp_association *asoc = NULL;
6302
6303 /* User must provide at least the assoc id */
6304 if (len < sizeof(sctp_assoc_t))
6305 return -EINVAL;
6306
Guenter Roeck726bc6b2013-02-27 10:57:31 +00006307 /* Allow the struct to grow and fill in as much as possible */
6308 len = min_t(size_t, len, sizeof(sas));
6309
Michele Baldessari196d6752012-12-01 04:49:42 +00006310 if (copy_from_user(&sas, optval, len))
6311 return -EFAULT;
6312
6313 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
6314 if (!asoc)
6315 return -EINVAL;
6316
6317 sas.sas_rtxchunks = asoc->stats.rtxchunks;
6318 sas.sas_gapcnt = asoc->stats.gapcnt;
6319 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
6320 sas.sas_osacks = asoc->stats.osacks;
6321 sas.sas_isacks = asoc->stats.isacks;
6322 sas.sas_octrlchunks = asoc->stats.octrlchunks;
6323 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
6324 sas.sas_oodchunks = asoc->stats.oodchunks;
6325 sas.sas_iodchunks = asoc->stats.iodchunks;
6326 sas.sas_ouodchunks = asoc->stats.ouodchunks;
6327 sas.sas_iuodchunks = asoc->stats.iuodchunks;
6328 sas.sas_idupchunks = asoc->stats.idupchunks;
6329 sas.sas_opackets = asoc->stats.opackets;
6330 sas.sas_ipackets = asoc->stats.ipackets;
6331
6332 /* New high max rto observed, will return 0 if not a single
6333 * RTO update took place. obs_rto_ipaddr will be bogus
6334 * in such a case
6335 */
6336 sas.sas_maxrto = asoc->stats.max_obs_rto;
6337 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
6338 sizeof(struct sockaddr_storage));
6339
6340 /* Mark beginning of a new observation period */
6341 asoc->stats.max_obs_rto = asoc->rto_min;
6342
Michele Baldessari196d6752012-12-01 04:49:42 +00006343 if (put_user(len, optlen))
6344 return -EFAULT;
6345
Daniel Borkmannbb333812013-06-28 19:49:40 +02006346 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
Michele Baldessari196d6752012-12-01 04:49:42 +00006347
6348 if (copy_to_user(optval, &sas, len))
6349 return -EFAULT;
6350
6351 return 0;
6352}
6353
Geir Ola Vaagland0d3a4212014-07-12 20:30:37 +02006354static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
6355 char __user *optval,
6356 int __user *optlen)
6357{
6358 int val = 0;
6359
6360 if (len < sizeof(int))
6361 return -EINVAL;
6362
6363 len = sizeof(int);
6364 if (sctp_sk(sk)->recvrcvinfo)
6365 val = 1;
6366 if (put_user(len, optlen))
6367 return -EFAULT;
6368 if (copy_to_user(optval, &val, len))
6369 return -EFAULT;
6370
6371 return 0;
6372}
6373
Geir Ola Vaagland2347c802014-07-12 20:30:38 +02006374static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
6375 char __user *optval,
6376 int __user *optlen)
6377{
6378 int val = 0;
6379
6380 if (len < sizeof(int))
6381 return -EINVAL;
6382
6383 len = sizeof(int);
6384 if (sctp_sk(sk)->recvnxtinfo)
6385 val = 1;
6386 if (put_user(len, optlen))
6387 return -EFAULT;
6388 if (copy_to_user(optval, &val, len))
6389 return -EFAULT;
6390
6391 return 0;
6392}
6393
Xin Long28aa4c22016-07-09 19:47:40 +08006394static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
6395 char __user *optval,
6396 int __user *optlen)
6397{
6398 struct sctp_assoc_value params;
6399 struct sctp_association *asoc;
6400 int retval = -EFAULT;
6401
6402 if (len < sizeof(params)) {
6403 retval = -EINVAL;
6404 goto out;
6405 }
6406
6407 len = sizeof(params);
6408 if (copy_from_user(&params, optval, len))
6409 goto out;
6410
6411 asoc = sctp_id2assoc(sk, params.assoc_id);
6412 if (asoc) {
6413 params.assoc_value = asoc->prsctp_enable;
6414 } else if (!params.assoc_id) {
6415 struct sctp_sock *sp = sctp_sk(sk);
6416
6417 params.assoc_value = sp->ep->prsctp_enable;
6418 } else {
6419 retval = -EINVAL;
6420 goto out;
6421 }
6422
6423 if (put_user(len, optlen))
6424 goto out;
6425
6426 if (copy_to_user(optval, &params, len))
6427 goto out;
6428
6429 retval = 0;
6430
6431out:
6432 return retval;
6433}
6434
Xin Longf959fb42016-07-09 19:47:41 +08006435static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
6436 char __user *optval,
6437 int __user *optlen)
6438{
6439 struct sctp_default_prinfo info;
6440 struct sctp_association *asoc;
6441 int retval = -EFAULT;
6442
6443 if (len < sizeof(info)) {
6444 retval = -EINVAL;
6445 goto out;
6446 }
6447
6448 len = sizeof(info);
6449 if (copy_from_user(&info, optval, len))
6450 goto out;
6451
6452 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
6453 if (asoc) {
6454 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
6455 info.pr_value = asoc->default_timetolive;
6456 } else if (!info.pr_assoc_id) {
6457 struct sctp_sock *sp = sctp_sk(sk);
6458
6459 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
6460 info.pr_value = sp->default_timetolive;
6461 } else {
6462 retval = -EINVAL;
6463 goto out;
6464 }
6465
6466 if (put_user(len, optlen))
6467 goto out;
6468
6469 if (copy_to_user(optval, &info, len))
6470 goto out;
6471
6472 retval = 0;
6473
6474out:
6475 return retval;
6476}
6477
Xin Long826d2532016-07-09 19:47:42 +08006478static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
6479 char __user *optval,
6480 int __user *optlen)
6481{
6482 struct sctp_prstatus params;
6483 struct sctp_association *asoc;
6484 int policy;
6485 int retval = -EINVAL;
6486
6487 if (len < sizeof(params))
6488 goto out;
6489
6490 len = sizeof(params);
6491 if (copy_from_user(&params, optval, len)) {
6492 retval = -EFAULT;
6493 goto out;
6494 }
6495
6496 policy = params.sprstat_policy;
6497 if (policy & ~SCTP_PR_SCTP_MASK)
6498 goto out;
6499
6500 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
6501 if (!asoc)
6502 goto out;
6503
6504 if (policy == SCTP_PR_SCTP_NONE) {
6505 params.sprstat_abandoned_unsent = 0;
6506 params.sprstat_abandoned_sent = 0;
6507 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
6508 params.sprstat_abandoned_unsent +=
6509 asoc->abandoned_unsent[policy];
6510 params.sprstat_abandoned_sent +=
6511 asoc->abandoned_sent[policy];
6512 }
6513 } else {
6514 params.sprstat_abandoned_unsent =
6515 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6516 params.sprstat_abandoned_sent =
6517 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
6518 }
6519
6520 if (put_user(len, optlen)) {
6521 retval = -EFAULT;
6522 goto out;
6523 }
6524
6525 if (copy_to_user(optval, &params, len)) {
6526 retval = -EFAULT;
6527 goto out;
6528 }
6529
6530 retval = 0;
6531
6532out:
6533 return retval;
6534}
6535
Xin Long9fb657a2017-01-18 00:44:46 +08006536static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
6537 char __user *optval,
6538 int __user *optlen)
6539{
6540 struct sctp_assoc_value params;
6541 struct sctp_association *asoc;
6542 int retval = -EFAULT;
6543
6544 if (len < sizeof(params)) {
6545 retval = -EINVAL;
6546 goto out;
6547 }
6548
6549 len = sizeof(params);
6550 if (copy_from_user(&params, optval, len))
6551 goto out;
6552
6553 asoc = sctp_id2assoc(sk, params.assoc_id);
6554 if (asoc) {
6555 params.assoc_value = asoc->strreset_enable;
6556 } else if (!params.assoc_id) {
6557 struct sctp_sock *sp = sctp_sk(sk);
6558
6559 params.assoc_value = sp->ep->strreset_enable;
6560 } else {
6561 retval = -EINVAL;
6562 goto out;
6563 }
6564
6565 if (put_user(len, optlen))
6566 goto out;
6567
6568 if (copy_to_user(optval, &params, len))
6569 goto out;
6570
6571 retval = 0;
6572
6573out:
6574 return retval;
6575}
6576
Daniel Borkmanndda91922013-06-17 11:40:05 +02006577static int sctp_getsockopt(struct sock *sk, int level, int optname,
6578 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006579{
6580 int retval = 0;
6581 int len;
6582
Daniel Borkmannbb333812013-06-28 19:49:40 +02006583 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006584
6585 /* I can hardly begin to describe how wrong this is. This is
6586 * so broken as to be worse than useless. The API draft
6587 * REALLY is NOT helpful here... I am not convinced that the
6588 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
6589 * are at all well-founded.
6590 */
6591 if (level != SOL_SCTP) {
6592 struct sctp_af *af = sctp_sk(sk)->pf->af;
6593
6594 retval = af->getsockopt(sk, level, optname, optval, optlen);
6595 return retval;
6596 }
6597
6598 if (get_user(len, optlen))
6599 return -EFAULT;
6600
Jiri Slabya4b8e712016-10-21 14:13:24 +02006601 if (len < 0)
6602 return -EINVAL;
6603
wangweidong048ed4b2014-01-21 15:44:11 +08006604 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006605
6606 switch (optname) {
6607 case SCTP_STATUS:
6608 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
6609 break;
6610 case SCTP_DISABLE_FRAGMENTS:
6611 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
6612 optlen);
6613 break;
6614 case SCTP_EVENTS:
6615 retval = sctp_getsockopt_events(sk, len, optval, optlen);
6616 break;
6617 case SCTP_AUTOCLOSE:
6618 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
6619 break;
6620 case SCTP_SOCKOPT_PEELOFF:
6621 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
6622 break;
6623 case SCTP_PEER_ADDR_PARAMS:
6624 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
6625 optlen);
6626 break;
Shan Wei4580ccc2011-01-18 22:39:00 +00006627 case SCTP_DELAYED_SACK:
Wei Yongjund364d922008-05-09 15:13:26 -07006628 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
Frank Filz77086102005-12-22 11:37:30 -08006629 optlen);
6630 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006631 case SCTP_INITMSG:
6632 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
6633 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006634 case SCTP_GET_PEER_ADDRS:
6635 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
6636 optlen);
6637 break;
6638 case SCTP_GET_LOCAL_ADDRS:
6639 retval = sctp_getsockopt_local_addrs(sk, len, optval,
6640 optlen);
6641 break;
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04006642 case SCTP_SOCKOPT_CONNECTX3:
6643 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
6644 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006645 case SCTP_DEFAULT_SEND_PARAM:
6646 retval = sctp_getsockopt_default_send_param(sk, len,
6647 optval, optlen);
6648 break;
Geir Ola Vaagland6b3fd5f2014-07-12 20:30:39 +02006649 case SCTP_DEFAULT_SNDINFO:
6650 retval = sctp_getsockopt_default_sndinfo(sk, len,
6651 optval, optlen);
6652 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006653 case SCTP_PRIMARY_ADDR:
6654 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
6655 break;
6656 case SCTP_NODELAY:
6657 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
6658 break;
6659 case SCTP_RTOINFO:
6660 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
6661 break;
6662 case SCTP_ASSOCINFO:
6663 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
6664 break;
6665 case SCTP_I_WANT_MAPPED_V4_ADDR:
6666 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
6667 break;
6668 case SCTP_MAXSEG:
6669 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
6670 break;
6671 case SCTP_GET_PEER_ADDR_INFO:
6672 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
6673 optlen);
6674 break;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08006675 case SCTP_ADAPTATION_LAYER:
6676 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
Linus Torvalds1da177e2005-04-16 15:20:36 -07006677 optlen);
6678 break;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08006679 case SCTP_CONTEXT:
6680 retval = sctp_getsockopt_context(sk, len, optval, optlen);
6681 break;
Vlad Yasevichb6e13312007-04-20 12:23:15 -07006682 case SCTP_FRAGMENT_INTERLEAVE:
6683 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
6684 optlen);
6685 break;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07006686 case SCTP_PARTIAL_DELIVERY_POINT:
6687 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
6688 optlen);
6689 break;
Vlad Yasevich70331572007-03-23 11:34:36 -07006690 case SCTP_MAX_BURST:
6691 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
6692 break;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07006693 case SCTP_AUTH_KEY:
6694 case SCTP_AUTH_CHUNK:
6695 case SCTP_AUTH_DELETE_KEY:
6696 retval = -EOPNOTSUPP;
6697 break;
6698 case SCTP_HMAC_IDENT:
6699 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
6700 break;
6701 case SCTP_AUTH_ACTIVE_KEY:
6702 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
6703 break;
6704 case SCTP_PEER_AUTH_CHUNKS:
6705 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
6706 optlen);
6707 break;
6708 case SCTP_LOCAL_AUTH_CHUNKS:
6709 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
6710 optlen);
6711 break;
Wei Yongjunaea3c5c2008-12-25 16:57:24 -08006712 case SCTP_GET_ASSOC_NUMBER:
6713 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
6714 break;
Wei Yongjun209ba422011-04-17 17:27:08 +00006715 case SCTP_GET_ASSOC_ID_LIST:
6716 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
6717 break;
Michio Honda7dc04d72011-04-26 20:16:31 +09006718 case SCTP_AUTO_ASCONF:
6719 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
6720 break;
Neil Horman5aa93bc2012-07-21 07:56:07 +00006721 case SCTP_PEER_ADDR_THLDS:
6722 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
6723 break;
Michele Baldessari196d6752012-12-01 04:49:42 +00006724 case SCTP_GET_ASSOC_STATS:
6725 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
6726 break;
Geir Ola Vaagland0d3a4212014-07-12 20:30:37 +02006727 case SCTP_RECVRCVINFO:
6728 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
6729 break;
Geir Ola Vaagland2347c802014-07-12 20:30:38 +02006730 case SCTP_RECVNXTINFO:
6731 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
6732 break;
Xin Long28aa4c22016-07-09 19:47:40 +08006733 case SCTP_PR_SUPPORTED:
6734 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
6735 break;
Xin Longf959fb42016-07-09 19:47:41 +08006736 case SCTP_DEFAULT_PRINFO:
6737 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
6738 optlen);
6739 break;
Xin Long826d2532016-07-09 19:47:42 +08006740 case SCTP_PR_ASSOC_STATUS:
6741 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
6742 optlen);
6743 break;
Xin Long9fb657a2017-01-18 00:44:46 +08006744 case SCTP_ENABLE_STREAM_RESET:
6745 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
6746 optlen);
6747 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006748 default:
6749 retval = -ENOPROTOOPT;
6750 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07006751 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006752
wangweidong048ed4b2014-01-21 15:44:11 +08006753 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006754 return retval;
6755}
6756
Craig Gallek086c6532016-02-10 11:50:35 -05006757static int sctp_hash(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006758{
6759 /* STUB */
Craig Gallek086c6532016-02-10 11:50:35 -05006760 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006761}
6762
6763static void sctp_unhash(struct sock *sk)
6764{
6765 /* STUB */
6766}
6767
6768/* Check if port is acceptable. Possibly find first available port.
6769 *
6770 * The port hash table (contained in the 'global' SCTP protocol storage
6771 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6772 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6773 * list (the list number is the port number hashed out, so as you
6774 * would expect from a hash function, all the ports in a given list have
6775 * such a number that hashes out to the same list number; you were
6776 * expecting that, right?); so each list has a set of ports, with a
6777 * link to the socket (struct sock) that uses it, the port number and
6778 * a fastreuse flag (FIXME: NPI ipg).
6779 */
6780static struct sctp_bind_bucket *sctp_bucket_create(
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006781 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006782
6783static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
6784{
6785 struct sctp_bind_hashbucket *head; /* hash list */
Sasha Levinb67bfe02013-02-27 17:06:00 -08006786 struct sctp_bind_bucket *pp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006787 unsigned short snum;
6788 int ret;
6789
Al Viro04afd8b2006-11-20 17:02:01 -08006790 snum = ntohs(addr->v4.sin_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006791
Daniel Borkmannbb333812013-06-28 19:49:40 +02006792 pr_debug("%s: begins, snum:%d\n", __func__, snum);
6793
wangweidong79b91132014-01-21 15:44:07 +08006794 local_bh_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006795
6796 if (snum == 0) {
Stephen Hemminger06393002007-10-10 17:30:18 -07006797 /* Search for an available port. */
Stephen Hemminger227b60f2007-10-10 17:30:46 -07006798 int low, high, remaining, index;
6799 unsigned int rover;
WANG Cong122ff242014-05-12 16:04:53 -07006800 struct net *net = sock_net(sk);
Stephen Hemminger227b60f2007-10-10 17:30:46 -07006801
WANG Cong122ff242014-05-12 16:04:53 -07006802 inet_get_local_port_range(net, &low, &high);
Stephen Hemminger227b60f2007-10-10 17:30:46 -07006803 remaining = (high - low) + 1;
Aruna-Hewapathirane63862b52014-01-11 07:15:59 -05006804 rover = prandom_u32() % remaining + low;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006805
Linus Torvalds1da177e2005-04-16 15:20:36 -07006806 do {
6807 rover++;
6808 if ((rover < low) || (rover > high))
6809 rover = low;
WANG Cong122ff242014-05-12 16:04:53 -07006810 if (inet_is_local_reserved_port(net, rover))
Amerigo Wange3826f12010-05-05 00:27:06 +00006811 continue;
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006812 index = sctp_phashfn(sock_net(sk), rover);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006813 head = &sctp_port_hashtable[index];
wangweidong3c8e43b2014-01-21 15:44:08 +08006814 spin_lock(&head->lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08006815 sctp_for_each_hentry(pp, &head->chain)
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006816 if ((pp->port == rover) &&
6817 net_eq(sock_net(sk), pp->net))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006818 goto next;
6819 break;
6820 next:
wangweidong3c8e43b2014-01-21 15:44:08 +08006821 spin_unlock(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006822 } while (--remaining > 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006823
6824 /* Exhausted local port range during search? */
6825 ret = 1;
6826 if (remaining <= 0)
6827 goto fail;
6828
6829 /* OK, here is the one we will use. HEAD (the port
6830 * hash table list entry) is non-NULL and we hold it's
6831 * mutex.
6832 */
6833 snum = rover;
6834 } else {
6835 /* We are given an specific port number; we verify
6836 * that it is not being used. If it is used, we will
6837 * exahust the search in the hash list corresponding
6838 * to the port number (snum) - we detect that with the
6839 * port iterator, pp being NULL.
6840 */
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006841 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
wangweidong3c8e43b2014-01-21 15:44:08 +08006842 spin_lock(&head->lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08006843 sctp_for_each_hentry(pp, &head->chain) {
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006844 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006845 goto pp_found;
6846 }
6847 }
6848 pp = NULL;
6849 goto pp_not_found;
6850pp_found:
6851 if (!hlist_empty(&pp->owner)) {
6852 /* We had a port hash table hit - there is an
6853 * available port (pp != NULL) and it is being
6854 * used by other socket (pp->owner not empty); that other
6855 * socket is going to be sk2.
6856 */
6857 int reuse = sk->sk_reuse;
6858 struct sock *sk2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006859
Daniel Borkmannbb333812013-06-28 19:49:40 +02006860 pr_debug("%s: found a possible match\n", __func__);
6861
Vlad Yasevichce5325c2007-05-04 13:34:49 -07006862 if (pp->fastreuse && sk->sk_reuse &&
6863 sk->sk_state != SCTP_SS_LISTENING)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006864 goto success;
6865
6866 /* Run through the list of sockets bound to the port
6867 * (pp->port) [via the pointers bind_next and
6868 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
6869 * we get the endpoint they describe and run through
6870 * the endpoint's list of IP (v4 or v6) addresses,
6871 * comparing each of the addresses with the address of
6872 * the socket sk. If we find a match, then that means
6873 * that this port/socket (sk) combination are already
6874 * in an endpoint.
6875 */
Sasha Levinb67bfe02013-02-27 17:06:00 -08006876 sk_for_each_bound(sk2, &pp->owner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006877 struct sctp_endpoint *ep2;
6878 ep2 = sctp_sk(sk2)->ep;
6879
Vlad Yasevich4e540642008-07-18 23:06:32 -07006880 if (sk == sk2 ||
6881 (reuse && sk2->sk_reuse &&
6882 sk2->sk_state != SCTP_SS_LISTENING))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006883 continue;
6884
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07006885 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
6886 sctp_sk(sk2), sctp_sk(sk))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006887 ret = (long)sk2;
6888 goto fail_unlock;
6889 }
6890 }
Daniel Borkmannbb333812013-06-28 19:49:40 +02006891
6892 pr_debug("%s: found a match\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006893 }
6894pp_not_found:
6895 /* If there was a hash table miss, create a new port. */
6896 ret = 1;
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006897 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006898 goto fail_unlock;
6899
6900 /* In either case (hit or miss), make sure fastreuse is 1 only
6901 * if sk->sk_reuse is too (that is, if the caller requested
6902 * SO_REUSEADDR on this socket -sk-).
6903 */
Vlad Yasevichce5325c2007-05-04 13:34:49 -07006904 if (hlist_empty(&pp->owner)) {
6905 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
6906 pp->fastreuse = 1;
6907 else
6908 pp->fastreuse = 0;
6909 } else if (pp->fastreuse &&
6910 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006911 pp->fastreuse = 0;
6912
6913 /* We are set, so fill up all the data in the hash table
6914 * entry, tie the socket list information with the rest of the
6915 * sockets FIXME: Blurry, NPI (ipg).
6916 */
6917success:
Linus Torvalds1da177e2005-04-16 15:20:36 -07006918 if (!sctp_sk(sk)->bind_hash) {
Eric Dumazetc720c7e82009-10-15 06:30:45 +00006919 inet_sk(sk)->inet_num = snum;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006920 sk_add_bind_node(sk, &pp->owner);
6921 sctp_sk(sk)->bind_hash = pp;
6922 }
6923 ret = 0;
6924
6925fail_unlock:
wangweidong3c8e43b2014-01-21 15:44:08 +08006926 spin_unlock(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006927
6928fail:
wangweidong79b91132014-01-21 15:44:07 +08006929 local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006930 return ret;
6931}
6932
6933/* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6934 * port is requested.
6935 */
6936static int sctp_get_port(struct sock *sk, unsigned short snum)
6937{
Linus Torvalds1da177e2005-04-16 15:20:36 -07006938 union sctp_addr addr;
6939 struct sctp_af *af = sctp_sk(sk)->pf->af;
6940
6941 /* Set up a dummy address struct from the sk. */
6942 af->from_sk(&addr, sk);
6943 addr.v4.sin_port = htons(snum);
6944
6945 /* Note: sk->sk_num gets filled in if ephemeral port request. */
Daniel Borkmann62208f12013-06-25 18:17:30 +02006946 return !!sctp_get_port_local(sk, &addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006947}
6948
6949/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07006950 * Move a socket to LISTENING state.
6951 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02006952static int sctp_listen_start(struct sock *sk, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006953{
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006954 struct sctp_sock *sp = sctp_sk(sk);
6955 struct sctp_endpoint *ep = sp->ep;
Herbert Xu5821c762016-01-24 21:20:12 +08006956 struct crypto_shash *tfm = NULL;
Neil Horman3c681982012-10-24 09:20:03 +00006957 char alg[32];
Linus Torvalds1da177e2005-04-16 15:20:36 -07006958
6959 /* Allocate HMAC for generating cookie. */
Neil Horman3c681982012-10-24 09:20:03 +00006960 if (!sp->hmac && sp->sctp_hmac_alg) {
6961 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
Herbert Xu5821c762016-01-24 21:20:12 +08006962 tfm = crypto_alloc_shash(alg, 0, 0);
Vlad Yasevich8dc49842007-05-09 13:50:20 -07006963 if (IS_ERR(tfm)) {
Joe Perchese87cc472012-05-13 21:56:26 +00006964 net_info_ratelimited("failed to load transform for %s: %ld\n",
Neil Horman3c681982012-10-24 09:20:03 +00006965 sp->sctp_hmac_alg, PTR_ERR(tfm));
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006966 return -ENOSYS;
6967 }
6968 sctp_sk(sk)->hmac = tfm;
6969 }
6970
6971 /*
6972 * If a bind() or sctp_bindx() is not called prior to a listen()
6973 * call that allows new associations to be accepted, the system
6974 * picks an ephemeral port and will choose an address set equivalent
6975 * to binding with a wildcard address.
6976 *
6977 * This is not currently spelled out in the SCTP sockets
6978 * extensions draft, but follows the practice as seen in TCP
6979 * sockets.
6980 *
6981 */
6982 sk->sk_state = SCTP_SS_LISTENING;
6983 if (!ep->base.bind_addr.port) {
6984 if (sctp_autobind(sk))
6985 return -EAGAIN;
6986 } else {
Eric Dumazetc720c7e82009-10-15 06:30:45 +00006987 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006988 sk->sk_state = SCTP_SS_CLOSED;
6989 return -EADDRINUSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006990 }
6991 }
6992
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006993 sk->sk_max_ack_backlog = backlog;
6994 sctp_hash_endpoint(ep);
6995 return 0;
6996}
6997
6998/*
6999 * 4.1.3 / 5.1.3 listen()
7000 *
7001 * By default, new associations are not accepted for UDP style sockets.
7002 * An application uses listen() to mark a socket as being able to
7003 * accept new associations.
7004 *
7005 * On TCP style sockets, applications use listen() to ready the SCTP
7006 * endpoint for accepting inbound associations.
7007 *
7008 * On both types of endpoints a backlog of '0' disables listening.
7009 *
7010 * Move a socket to LISTENING state.
7011 */
7012int sctp_inet_listen(struct socket *sock, int backlog)
7013{
7014 struct sock *sk = sock->sk;
7015 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7016 int err = -EINVAL;
7017
7018 if (unlikely(backlog < 0))
7019 return err;
7020
wangweidong048ed4b2014-01-21 15:44:11 +08007021 lock_sock(sk);
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00007022
7023 /* Peeled-off sockets are not allowed to listen(). */
7024 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
7025 goto out;
7026
7027 if (sock->state != SS_UNCONNECTED)
7028 goto out;
7029
7030 /* If backlog is zero, disable listening. */
7031 if (!backlog) {
7032 if (sctp_sstate(sk, CLOSED))
7033 goto out;
7034
7035 err = 0;
7036 sctp_unhash_endpoint(ep);
7037 sk->sk_state = SCTP_SS_CLOSED;
7038 if (sk->sk_reuse)
7039 sctp_sk(sk)->bind_hash->fastreuse = 1;
7040 goto out;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07007041 }
7042
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00007043 /* If we are already listening, just update the backlog */
7044 if (sctp_sstate(sk, LISTENING))
7045 sk->sk_max_ack_backlog = backlog;
7046 else {
7047 err = sctp_listen_start(sk, backlog);
7048 if (err)
7049 goto out;
7050 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07007051
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00007052 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007053out:
wangweidong048ed4b2014-01-21 15:44:11 +08007054 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007055 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007056}
7057
7058/*
7059 * This function is done by modeling the current datagram_poll() and the
7060 * tcp_poll(). Note that, based on these implementations, we don't
7061 * lock the socket in this function, even though it seems that,
7062 * ideally, locking or some other mechanisms can be used to ensure
Neil Horman9bffc4a2005-12-19 14:24:40 -08007063 * the integrity of the counters (sndbuf and wmem_alloc) used
Linus Torvalds1da177e2005-04-16 15:20:36 -07007064 * in this place. We assume that we don't need locks either until proven
7065 * otherwise.
7066 *
7067 * Another thing to note is that we include the Async I/O support
7068 * here, again, by modeling the current TCP/UDP code. We don't have
7069 * a good way to test with it yet.
7070 */
7071unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
7072{
7073 struct sock *sk = sock->sk;
7074 struct sctp_sock *sp = sctp_sk(sk);
7075 unsigned int mask;
7076
Eric Dumazetaa395142010-04-20 13:03:51 +00007077 poll_wait(file, sk_sleep(sk), wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007078
Marcelo Ricardo Leitner486bdee2016-04-12 18:11:31 -03007079 sock_rps_record_flow(sk);
7080
Linus Torvalds1da177e2005-04-16 15:20:36 -07007081 /* A TCP-style listening socket becomes readable when the accept queue
7082 * is not empty.
7083 */
7084 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
7085 return (!list_empty(&sp->ep->asocs)) ?
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09007086 (POLLIN | POLLRDNORM) : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007087
7088 mask = 0;
7089
7090 /* Is there any exceptional events? */
7091 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
Keller, Jacob E7d4c04f2013-03-28 11:19:25 +00007092 mask |= POLLERR |
Daniel Borkmanna0fb05d2013-09-07 16:44:59 +02007093 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
Davide Libenzif348d702006-03-25 03:07:39 -08007094 if (sk->sk_shutdown & RCV_SHUTDOWN)
Eric Dumazetdb409802010-09-06 11:13:50 +00007095 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007096 if (sk->sk_shutdown == SHUTDOWN_MASK)
7097 mask |= POLLHUP;
7098
7099 /* Is it readable? Reconsider this code with TCP-style support. */
Eric Dumazetdb409802010-09-06 11:13:50 +00007100 if (!skb_queue_empty(&sk->sk_receive_queue))
Linus Torvalds1da177e2005-04-16 15:20:36 -07007101 mask |= POLLIN | POLLRDNORM;
7102
7103 /* The association is either gone or not ready. */
7104 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
7105 return mask;
7106
7107 /* Is it writable? */
7108 if (sctp_writeable(sk)) {
7109 mask |= POLLOUT | POLLWRNORM;
7110 } else {
Eric Dumazet9cd3e072015-11-29 20:03:10 -08007111 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007112 /*
7113 * Since the socket is not locked, the buffer
7114 * might be made available after the writeable check and
7115 * before the bit is set. This could cause a lost I/O
7116 * signal. tcp_poll() has a race breaker for this race
7117 * condition. Based on their implementation, we put
7118 * in the following code to cover it as well.
7119 */
7120 if (sctp_writeable(sk))
7121 mask |= POLLOUT | POLLWRNORM;
7122 }
7123 return mask;
7124}
7125
7126/********************************************************************
7127 * 2nd Level Abstractions
7128 ********************************************************************/
7129
7130static struct sctp_bind_bucket *sctp_bucket_create(
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00007131 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007132{
7133 struct sctp_bind_bucket *pp;
7134
Christoph Lameter54e6ecb2006-12-06 20:33:16 -08007135 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007136 if (pp) {
Li Zefan935a7f62008-04-10 01:58:06 -07007137 SCTP_DBG_OBJCNT_INC(bind_bucket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007138 pp->port = snum;
7139 pp->fastreuse = 0;
7140 INIT_HLIST_HEAD(&pp->owner);
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00007141 pp->net = net;
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05007142 hlist_add_head(&pp->node, &head->chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007143 }
7144 return pp;
7145}
7146
7147/* Caller must hold hashbucket lock for this tb with local BH disabled */
7148static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
7149{
Sridhar Samudrala37fa6872006-07-21 14:45:47 -07007150 if (pp && hlist_empty(&pp->owner)) {
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05007151 __hlist_del(&pp->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007152 kmem_cache_free(sctp_bucket_cachep, pp);
7153 SCTP_DBG_OBJCNT_DEC(bind_bucket);
7154 }
7155}
7156
7157/* Release this socket's reference to a local port. */
7158static inline void __sctp_put_port(struct sock *sk)
7159{
7160 struct sctp_bind_hashbucket *head =
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00007161 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
7162 inet_sk(sk)->inet_num)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07007163 struct sctp_bind_bucket *pp;
7164
wangweidong3c8e43b2014-01-21 15:44:08 +08007165 spin_lock(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007166 pp = sctp_sk(sk)->bind_hash;
7167 __sk_del_bind_node(sk);
7168 sctp_sk(sk)->bind_hash = NULL;
Eric Dumazetc720c7e82009-10-15 06:30:45 +00007169 inet_sk(sk)->inet_num = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007170 sctp_bucket_destroy(pp);
wangweidong3c8e43b2014-01-21 15:44:08 +08007171 spin_unlock(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007172}
7173
7174void sctp_put_port(struct sock *sk)
7175{
wangweidong79b91132014-01-21 15:44:07 +08007176 local_bh_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07007177 __sctp_put_port(sk);
wangweidong79b91132014-01-21 15:44:07 +08007178 local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07007179}
7180
7181/*
7182 * The system picks an ephemeral port and choose an address set equivalent
7183 * to binding with a wildcard address.
7184 * One of those addresses will be the primary address for the association.
7185 * This automatically enables the multihoming capability of SCTP.
7186 */
7187static int sctp_autobind(struct sock *sk)
7188{
7189 union sctp_addr autoaddr;
7190 struct sctp_af *af;
Al Viro6fbfa9f2006-11-20 17:24:53 -08007191 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007192
7193 /* Initialize a local sockaddr structure to INADDR_ANY. */
7194 af = sctp_sk(sk)->pf->af;
7195
Eric Dumazetc720c7e82009-10-15 06:30:45 +00007196 port = htons(inet_sk(sk)->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007197 af->inaddr_any(&autoaddr, port);
7198
7199 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
7200}
7201
7202/* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
7203 *
7204 * From RFC 2292
7205 * 4.2 The cmsghdr Structure *
7206 *
7207 * When ancillary data is sent or received, any number of ancillary data
7208 * objects can be specified by the msg_control and msg_controllen members of
7209 * the msghdr structure, because each object is preceded by
7210 * a cmsghdr structure defining the object's length (the cmsg_len member).
7211 * Historically Berkeley-derived implementations have passed only one object
7212 * at a time, but this API allows multiple objects to be
7213 * passed in a single call to sendmsg() or recvmsg(). The following example
7214 * shows two ancillary data objects in a control buffer.
7215 *
7216 * |<--------------------------- msg_controllen -------------------------->|
7217 * | |
7218 *
7219 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
7220 *
7221 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
7222 * | | |
7223 *
7224 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
7225 *
7226 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
7227 * | | | | |
7228 *
7229 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7230 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
7231 *
7232 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
7233 *
7234 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7235 * ^
7236 * |
7237 *
7238 * msg_control
7239 * points here
7240 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02007241static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007242{
7243 struct cmsghdr *cmsg;
Vlad Yasevichab38fb02008-04-12 18:40:06 -07007244 struct msghdr *my_msg = (struct msghdr *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007245
Gu Zhengf95b4142014-12-11 11:22:04 +08007246 for_each_cmsghdr(cmsg, my_msg) {
Vlad Yasevichab38fb02008-04-12 18:40:06 -07007247 if (!CMSG_OK(my_msg, cmsg))
Linus Torvalds1da177e2005-04-16 15:20:36 -07007248 return -EINVAL;
7249
7250 /* Should we parse this header or ignore? */
7251 if (cmsg->cmsg_level != IPPROTO_SCTP)
7252 continue;
7253
7254 /* Strictly check lengths following example in SCM code. */
7255 switch (cmsg->cmsg_type) {
7256 case SCTP_INIT:
7257 /* SCTP Socket API Extension
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02007258 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007259 *
7260 * This cmsghdr structure provides information for
7261 * initializing new SCTP associations with sendmsg().
7262 * The SCTP_INITMSG socket option uses this same data
7263 * structure. This structure is not used for
7264 * recvmsg().
7265 *
7266 * cmsg_level cmsg_type cmsg_data[]
7267 * ------------ ------------ ----------------------
7268 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
7269 */
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02007270 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07007271 return -EINVAL;
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02007272
7273 cmsgs->init = CMSG_DATA(cmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007274 break;
7275
7276 case SCTP_SNDRCV:
7277 /* SCTP Socket API Extension
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02007278 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007279 *
7280 * This cmsghdr structure specifies SCTP options for
7281 * sendmsg() and describes SCTP header information
7282 * about a received message through recvmsg().
7283 *
7284 * cmsg_level cmsg_type cmsg_data[]
7285 * ------------ ------------ ----------------------
7286 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
7287 */
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02007288 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07007289 return -EINVAL;
7290
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02007291 cmsgs->srinfo = CMSG_DATA(cmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007292
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02007293 if (cmsgs->srinfo->sinfo_flags &
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07007294 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
Xin Longa6c2f792016-07-09 19:47:43 +08007295 SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07007296 SCTP_ABORT | SCTP_EOF))
Linus Torvalds1da177e2005-04-16 15:20:36 -07007297 return -EINVAL;
7298 break;
7299
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02007300 case SCTP_SNDINFO:
7301 /* SCTP Socket API Extension
7302 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
7303 *
7304 * This cmsghdr structure specifies SCTP options for
7305 * sendmsg(). This structure and SCTP_RCVINFO replaces
7306 * SCTP_SNDRCV which has been deprecated.
7307 *
7308 * cmsg_level cmsg_type cmsg_data[]
7309 * ------------ ------------ ---------------------
7310 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
7311 */
7312 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
7313 return -EINVAL;
7314
7315 cmsgs->sinfo = CMSG_DATA(cmsg);
7316
7317 if (cmsgs->sinfo->snd_flags &
7318 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
Xin Longa6c2f792016-07-09 19:47:43 +08007319 SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02007320 SCTP_ABORT | SCTP_EOF))
7321 return -EINVAL;
7322 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007323 default:
7324 return -EINVAL;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07007325 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07007326 }
Geir Ola Vaagland63b94932014-07-12 20:30:36 +02007327
Linus Torvalds1da177e2005-04-16 15:20:36 -07007328 return 0;
7329}
7330
7331/*
7332 * Wait for a packet..
7333 * Note: This function is the same function as in core/datagram.c
7334 * with a few modifications to make lksctp work.
7335 */
wangweidong26ac8e52013-12-23 12:16:51 +08007336static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007337{
7338 int error;
7339 DEFINE_WAIT(wait);
7340
Eric Dumazetaa395142010-04-20 13:03:51 +00007341 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007342
7343 /* Socket errors? */
7344 error = sock_error(sk);
7345 if (error)
7346 goto out;
7347
7348 if (!skb_queue_empty(&sk->sk_receive_queue))
7349 goto ready;
7350
7351 /* Socket shut down? */
7352 if (sk->sk_shutdown & RCV_SHUTDOWN)
7353 goto out;
7354
7355 /* Sequenced packets can come disconnected. If so we report the
7356 * problem.
7357 */
7358 error = -ENOTCONN;
7359
7360 /* Is there a good reason to think that we may receive some data? */
7361 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
7362 goto out;
7363
7364 /* Handle signals. */
7365 if (signal_pending(current))
7366 goto interrupted;
7367
7368 /* Let another process have a go. Since we are going to sleep
7369 * anyway. Note: This may cause odd behaviors if the message
7370 * does not fit in the user's buffer, but this seems to be the
7371 * only way to honor MSG_DONTWAIT realistically.
7372 */
wangweidong048ed4b2014-01-21 15:44:11 +08007373 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007374 *timeo_p = schedule_timeout(*timeo_p);
wangweidong048ed4b2014-01-21 15:44:11 +08007375 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007376
7377ready:
Eric Dumazetaa395142010-04-20 13:03:51 +00007378 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007379 return 0;
7380
7381interrupted:
7382 error = sock_intr_errno(*timeo_p);
7383
7384out:
Eric Dumazetaa395142010-04-20 13:03:51 +00007385 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007386 *err = error;
7387 return error;
7388}
7389
7390/* Receive a datagram.
7391 * Note: This is pretty much the same routine as in core/datagram.c
7392 * with a few changes to make lksctp work.
7393 */
Geir Ola Vaagland2347c802014-07-12 20:30:38 +02007394struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
7395 int noblock, int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007396{
7397 int error;
7398 struct sk_buff *skb;
7399 long timeo;
7400
Linus Torvalds1da177e2005-04-16 15:20:36 -07007401 timeo = sock_rcvtimeo(sk, noblock);
7402
Daniel Borkmannbb333812013-06-28 19:49:40 +02007403 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
7404 MAX_SCHEDULE_TIMEOUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007405
7406 do {
7407 /* Again only user level code calls this function,
7408 * so nothing interrupt level
7409 * will suddenly eat the receive_queue.
7410 *
7411 * Look at current nfs client by the way...
David Shwatrz8917a3c2010-12-02 09:01:55 +00007412 * However, this function was correct in any case. 8)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007413 */
7414 if (flags & MSG_PEEK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07007415 skb = skb_peek(&sk->sk_receive_queue);
7416 if (skb)
7417 atomic_inc(&skb->users);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007418 } else {
Marcelo Ricardo Leitner311b2172016-04-13 19:12:29 -03007419 skb = __skb_dequeue(&sk->sk_receive_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007420 }
7421
7422 if (skb)
7423 return skb;
7424
Neil Horman6736dc32005-12-02 20:30:06 -08007425 /* Caller is allowed not to check sk->sk_err before calling. */
7426 error = sock_error(sk);
7427 if (error)
7428 goto no_packet;
7429
Linus Torvalds1da177e2005-04-16 15:20:36 -07007430 if (sk->sk_shutdown & RCV_SHUTDOWN)
7431 break;
7432
Neil Horman8465a5f2014-04-17 15:26:51 -04007433 if (sk_can_busy_loop(sk) &&
7434 sk_busy_loop(sk, noblock))
7435 continue;
7436
Linus Torvalds1da177e2005-04-16 15:20:36 -07007437 /* User doesn't want to wait. */
7438 error = -EAGAIN;
7439 if (!timeo)
7440 goto no_packet;
7441 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
7442
7443 return NULL;
7444
7445no_packet:
7446 *err = error;
7447 return NULL;
7448}
7449
7450/* If sndbuf has changed, wake up per association sndbuf waiters. */
7451static void __sctp_write_space(struct sctp_association *asoc)
7452{
7453 struct sock *sk = asoc->base.sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007454
Eric Dumazetceb5d582015-11-29 20:03:11 -08007455 if (sctp_wspace(asoc) <= 0)
7456 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007457
Eric Dumazetceb5d582015-11-29 20:03:11 -08007458 if (waitqueue_active(&asoc->wait))
7459 wake_up_interruptible(&asoc->wait);
Eric Dumazeteaefd1102011-02-18 03:26:36 +00007460
Eric Dumazetceb5d582015-11-29 20:03:11 -08007461 if (sctp_writeable(sk)) {
7462 struct socket_wq *wq;
7463
7464 rcu_read_lock();
7465 wq = rcu_dereference(sk->sk_wq);
7466 if (wq) {
7467 if (waitqueue_active(&wq->wait))
7468 wake_up_interruptible(&wq->wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007469
7470 /* Note that we try to include the Async I/O support
7471 * here by modeling from the current TCP/UDP code.
7472 * We have not tested with it yet.
7473 */
Eric Dumazeteaefd1102011-02-18 03:26:36 +00007474 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
Eric Dumazetceb5d582015-11-29 20:03:11 -08007475 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007476 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08007477 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07007478 }
7479}
7480
Daniel Borkmann52c35be2014-04-08 17:26:13 +02007481static void sctp_wake_up_waiters(struct sock *sk,
7482 struct sctp_association *asoc)
7483{
7484 struct sctp_association *tmp = asoc;
7485
7486 /* We do accounting for the sndbuf space per association,
7487 * so we only need to wake our own association.
7488 */
7489 if (asoc->ep->sndbuf_policy)
7490 return __sctp_write_space(asoc);
7491
Daniel Borkmann1e1cdf82014-04-09 16:10:20 +02007492 /* If association goes down and is just flushing its
7493 * outq, then just normally notify others.
7494 */
7495 if (asoc->base.dead)
7496 return sctp_write_space(sk);
7497
Daniel Borkmann52c35be2014-04-08 17:26:13 +02007498 /* Accounting for the sndbuf space is per socket, so we
7499 * need to wake up others, try to be fair and in case of
7500 * other associations, let them have a go first instead
7501 * of just doing a sctp_write_space() call.
7502 *
7503 * Note that we reach sctp_wake_up_waiters() only when
7504 * associations free up queued chunks, thus we are under
7505 * lock and the list of associations on a socket is
7506 * guaranteed not to change.
7507 */
7508 for (tmp = list_next_entry(tmp, asocs); 1;
7509 tmp = list_next_entry(tmp, asocs)) {
7510 /* Manually skip the head element. */
7511 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
7512 continue;
7513 /* Wake up association. */
7514 __sctp_write_space(tmp);
7515 /* We've reached the end. */
7516 if (tmp == asoc)
7517 break;
7518 }
7519}
7520
Linus Torvalds1da177e2005-04-16 15:20:36 -07007521/* Do accounting for the sndbuf space.
7522 * Decrement the used sndbuf space of the corresponding association by the
7523 * data size which was just transmitted(freed).
7524 */
7525static void sctp_wfree(struct sk_buff *skb)
7526{
Daniel Borkmannf869c912014-11-20 01:54:48 +01007527 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
7528 struct sctp_association *asoc = chunk->asoc;
7529 struct sock *sk = asoc->base.sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007530
Neil Horman4eb701d2005-04-28 12:02:04 -07007531 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
7532 sizeof(struct sk_buff) +
7533 sizeof(struct sctp_chunk);
7534
Neil Horman4eb701d2005-04-28 12:02:04 -07007535 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
7536
Neil Horman4d93df02007-08-15 16:07:44 -07007537 /*
Hideo Aoki3ab224b2007-12-31 00:11:19 -08007538 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
Neil Horman4d93df02007-08-15 16:07:44 -07007539 */
7540 sk->sk_wmem_queued -= skb->truesize;
Hideo Aoki3ab224b2007-12-31 00:11:19 -08007541 sk_mem_uncharge(sk, skb->truesize);
Neil Horman4d93df02007-08-15 16:07:44 -07007542
Neil Horman4eb701d2005-04-28 12:02:04 -07007543 sock_wfree(skb);
Daniel Borkmann52c35be2014-04-08 17:26:13 +02007544 sctp_wake_up_waiters(sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007545
7546 sctp_association_put(asoc);
7547}
7548
Vlad Yasevich331c4ee2006-10-09 21:34:04 -07007549/* Do accounting for the receive space on the socket.
7550 * Accounting for the association is done in ulpevent.c
7551 * We set this as a destructor for the cloned data skbs so that
7552 * accounting is done at the correct time.
7553 */
7554void sctp_sock_rfree(struct sk_buff *skb)
7555{
7556 struct sock *sk = skb->sk;
7557 struct sctp_ulpevent *event = sctp_skb2event(skb);
7558
7559 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
Neil Horman4d93df02007-08-15 16:07:44 -07007560
7561 /*
Hideo Aoki3ab224b2007-12-31 00:11:19 -08007562 * Mimic the behavior of sock_rfree
Neil Horman4d93df02007-08-15 16:07:44 -07007563 */
Hideo Aoki3ab224b2007-12-31 00:11:19 -08007564 sk_mem_uncharge(sk, event->rmem_len);
Vlad Yasevich331c4ee2006-10-09 21:34:04 -07007565}
7566
7567
Linus Torvalds1da177e2005-04-16 15:20:36 -07007568/* Helper function to wait for space in the sndbuf. */
7569static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
7570 size_t msg_len)
7571{
7572 struct sock *sk = asoc->base.sk;
7573 int err = 0;
7574 long current_timeo = *timeo_p;
7575 DEFINE_WAIT(wait);
7576
Daniel Borkmannbb333812013-06-28 19:49:40 +02007577 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
7578 *timeo_p, msg_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007579
7580 /* Increment the association's refcnt. */
7581 sctp_association_hold(asoc);
7582
7583 /* Wait on the association specific sndbuf space. */
7584 for (;;) {
7585 prepare_to_wait_exclusive(&asoc->wait, &wait,
7586 TASK_INTERRUPTIBLE);
7587 if (!*timeo_p)
7588 goto do_nonblock;
7589 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
7590 asoc->base.dead)
7591 goto do_error;
7592 if (signal_pending(current))
7593 goto do_interrupted;
7594 if (msg_len <= sctp_wspace(asoc))
7595 break;
7596
7597 /* Let another process have a go. Since we are going
7598 * to sleep anyway.
7599 */
wangweidong048ed4b2014-01-21 15:44:11 +08007600 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007601 current_timeo = schedule_timeout(current_timeo);
Marcelo Ricardo Leitner2dcab592017-02-06 18:10:31 -02007602 if (sk != asoc->base.sk)
7603 goto do_error;
wangweidong048ed4b2014-01-21 15:44:11 +08007604 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007605
7606 *timeo_p = current_timeo;
7607 }
7608
7609out:
7610 finish_wait(&asoc->wait, &wait);
7611
7612 /* Release the association's refcnt. */
7613 sctp_association_put(asoc);
7614
7615 return err;
7616
7617do_error:
7618 err = -EPIPE;
7619 goto out;
7620
7621do_interrupted:
7622 err = sock_intr_errno(*timeo_p);
7623 goto out;
7624
7625do_nonblock:
7626 err = -EAGAIN;
7627 goto out;
7628}
7629
David S. Miller676d2362014-04-11 16:15:36 -04007630void sctp_data_ready(struct sock *sk)
Wei Yongjun561b1732010-04-28 08:47:18 +00007631{
David S. Miller7ef52732010-05-02 21:43:40 -07007632 struct socket_wq *wq;
7633
7634 rcu_read_lock();
7635 wq = rcu_dereference(sk->sk_wq);
Herbert Xu1ce0bf52015-11-26 13:55:39 +08007636 if (skwq_has_sleeper(wq))
David S. Miller7ef52732010-05-02 21:43:40 -07007637 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
Wei Yongjun561b1732010-04-28 08:47:18 +00007638 POLLRDNORM | POLLRDBAND);
7639 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
David S. Miller7ef52732010-05-02 21:43:40 -07007640 rcu_read_unlock();
Wei Yongjun561b1732010-04-28 08:47:18 +00007641}
7642
Linus Torvalds1da177e2005-04-16 15:20:36 -07007643/* If socket sndbuf has changed, wake up all per association waiters. */
7644void sctp_write_space(struct sock *sk)
7645{
7646 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007647
7648 /* Wake up the tasks in each wait queue. */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07007649 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07007650 __sctp_write_space(asoc);
7651 }
7652}
7653
7654/* Is there any sndbuf space available on the socket?
7655 *
Neil Horman9bffc4a2005-12-19 14:24:40 -08007656 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07007657 * associations on the same socket. For a UDP-style socket with
7658 * multiple associations, it is possible for it to be "unwriteable"
7659 * prematurely. I assume that this is acceptable because
7660 * a premature "unwriteable" is better than an accidental "writeable" which
7661 * would cause an unwanted block under certain circumstances. For the 1-1
7662 * UDP-style sockets or TCP-style sockets, this code should work.
7663 * - Daisy
7664 */
7665static int sctp_writeable(struct sock *sk)
7666{
7667 int amt = 0;
7668
Eric Dumazet31e6d362009-06-17 19:05:41 -07007669 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007670 if (amt < 0)
7671 amt = 0;
7672 return amt;
7673}
7674
7675/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7676 * returns immediately with EINPROGRESS.
7677 */
7678static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
7679{
7680 struct sock *sk = asoc->base.sk;
7681 int err = 0;
7682 long current_timeo = *timeo_p;
7683 DEFINE_WAIT(wait);
7684
Daniel Borkmannbb333812013-06-28 19:49:40 +02007685 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007686
7687 /* Increment the association's refcnt. */
7688 sctp_association_hold(asoc);
7689
7690 for (;;) {
7691 prepare_to_wait_exclusive(&asoc->wait, &wait,
7692 TASK_INTERRUPTIBLE);
7693 if (!*timeo_p)
7694 goto do_nonblock;
7695 if (sk->sk_shutdown & RCV_SHUTDOWN)
7696 break;
7697 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
7698 asoc->base.dead)
7699 goto do_error;
7700 if (signal_pending(current))
7701 goto do_interrupted;
7702
7703 if (sctp_state(asoc, ESTABLISHED))
7704 break;
7705
7706 /* Let another process have a go. Since we are going
7707 * to sleep anyway.
7708 */
wangweidong048ed4b2014-01-21 15:44:11 +08007709 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007710 current_timeo = schedule_timeout(current_timeo);
wangweidong048ed4b2014-01-21 15:44:11 +08007711 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007712
7713 *timeo_p = current_timeo;
7714 }
7715
7716out:
7717 finish_wait(&asoc->wait, &wait);
7718
7719 /* Release the association's refcnt. */
7720 sctp_association_put(asoc);
7721
7722 return err;
7723
7724do_error:
Vlad Yasevich81845c22006-01-30 15:59:54 -08007725 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007726 err = -ETIMEDOUT;
7727 else
7728 err = -ECONNREFUSED;
7729 goto out;
7730
7731do_interrupted:
7732 err = sock_intr_errno(*timeo_p);
7733 goto out;
7734
7735do_nonblock:
7736 err = -EINPROGRESS;
7737 goto out;
7738}
7739
7740static int sctp_wait_for_accept(struct sock *sk, long timeo)
7741{
7742 struct sctp_endpoint *ep;
7743 int err = 0;
7744 DEFINE_WAIT(wait);
7745
7746 ep = sctp_sk(sk)->ep;
7747
7748
7749 for (;;) {
Eric Dumazetaa395142010-04-20 13:03:51 +00007750 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
Linus Torvalds1da177e2005-04-16 15:20:36 -07007751 TASK_INTERRUPTIBLE);
7752
7753 if (list_empty(&ep->asocs)) {
wangweidong048ed4b2014-01-21 15:44:11 +08007754 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007755 timeo = schedule_timeout(timeo);
wangweidong048ed4b2014-01-21 15:44:11 +08007756 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007757 }
7758
7759 err = -EINVAL;
7760 if (!sctp_sstate(sk, LISTENING))
7761 break;
7762
7763 err = 0;
7764 if (!list_empty(&ep->asocs))
7765 break;
7766
7767 err = sock_intr_errno(timeo);
7768 if (signal_pending(current))
7769 break;
7770
7771 err = -EAGAIN;
7772 if (!timeo)
7773 break;
7774 }
7775
Eric Dumazetaa395142010-04-20 13:03:51 +00007776 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007777
7778 return err;
7779}
7780
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +02007781static void sctp_wait_for_close(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007782{
7783 DEFINE_WAIT(wait);
7784
7785 do {
Eric Dumazetaa395142010-04-20 13:03:51 +00007786 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007787 if (list_empty(&sctp_sk(sk)->ep->asocs))
7788 break;
wangweidong048ed4b2014-01-21 15:44:11 +08007789 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007790 timeout = schedule_timeout(timeout);
wangweidong048ed4b2014-01-21 15:44:11 +08007791 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007792 } while (!signal_pending(current) && timeout);
7793
Eric Dumazetaa395142010-04-20 13:03:51 +00007794 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007795}
7796
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007797static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
7798{
7799 struct sk_buff *frag;
7800
7801 if (!skb->data_len)
7802 goto done;
7803
7804 /* Don't forget the fragments. */
David S. Miller1b003be2009-06-09 00:22:35 -07007805 skb_walk_frags(skb, frag)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007806 sctp_skb_set_owner_r_frag(frag, sk);
7807
7808done:
7809 sctp_skb_set_owner_r(skb, sk);
7810}
7811
Vlad Yasevich914e1c82009-02-13 08:33:44 +00007812void sctp_copy_sock(struct sock *newsk, struct sock *sk,
7813 struct sctp_association *asoc)
7814{
7815 struct inet_sock *inet = inet_sk(sk);
Julia Lawall09cb47a2010-01-21 02:43:20 -08007816 struct inet_sock *newinet;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00007817
7818 newsk->sk_type = sk->sk_type;
7819 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
7820 newsk->sk_flags = sk->sk_flags;
Marcelo Ricardo Leitner50a5ffb2015-12-04 15:14:05 -02007821 newsk->sk_tsflags = sk->sk_tsflags;
Tom Herbert28448b82014-05-23 08:47:19 -07007822 newsk->sk_no_check_tx = sk->sk_no_check_tx;
7823 newsk->sk_no_check_rx = sk->sk_no_check_rx;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00007824 newsk->sk_reuse = sk->sk_reuse;
7825
7826 newsk->sk_shutdown = sk->sk_shutdown;
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +02007827 newsk->sk_destruct = sctp_destruct_sock;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00007828 newsk->sk_family = sk->sk_family;
7829 newsk->sk_protocol = IPPROTO_SCTP;
7830 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
7831 newsk->sk_sndbuf = sk->sk_sndbuf;
7832 newsk->sk_rcvbuf = sk->sk_rcvbuf;
7833 newsk->sk_lingertime = sk->sk_lingertime;
7834 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
7835 newsk->sk_sndtimeo = sk->sk_sndtimeo;
Marcelo Ricardo Leitner486bdee2016-04-12 18:11:31 -03007836 newsk->sk_rxhash = sk->sk_rxhash;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00007837
7838 newinet = inet_sk(newsk);
7839
7840 /* Initialize sk's sport, dport, rcv_saddr and daddr for
7841 * getsockname() and getpeername()
7842 */
Eric Dumazetc720c7e82009-10-15 06:30:45 +00007843 newinet->inet_sport = inet->inet_sport;
7844 newinet->inet_saddr = inet->inet_saddr;
7845 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
7846 newinet->inet_dport = htons(asoc->peer.port);
Vlad Yasevich914e1c82009-02-13 08:33:44 +00007847 newinet->pmtudisc = inet->pmtudisc;
Eric Dumazetc720c7e82009-10-15 06:30:45 +00007848 newinet->inet_id = asoc->next_tsn ^ jiffies;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00007849
7850 newinet->uc_ttl = inet->uc_ttl;
7851 newinet->mc_loop = 1;
7852 newinet->mc_ttl = 1;
7853 newinet->mc_index = 0;
7854 newinet->mc_list = NULL;
Marcelo Ricardo Leitner01ce63c2015-12-04 15:14:04 -02007855
7856 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
7857 net_enable_timestamp();
Marcelo Ricardo Leitner3538a5c2015-12-23 16:44:09 -02007858
7859 security_sk_clone(sk, newsk);
Vlad Yasevich914e1c82009-02-13 08:33:44 +00007860}
7861
Marcelo Ricardo Leitner2d45a022015-06-12 10:16:41 -03007862static inline void sctp_copy_descendant(struct sock *sk_to,
7863 const struct sock *sk_from)
7864{
7865 int ancestor_size = sizeof(struct inet_sock) +
7866 sizeof(struct sctp_sock) -
7867 offsetof(struct sctp_sock, auto_asconf_list);
7868
7869 if (sk_from->sk_family == PF_INET6)
7870 ancestor_size += sizeof(struct ipv6_pinfo);
7871
7872 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
7873}
7874
Linus Torvalds1da177e2005-04-16 15:20:36 -07007875/* Populate the fields of the newsk from the oldsk and migrate the assoc
7876 * and its messages to the newsk.
7877 */
7878static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
7879 struct sctp_association *assoc,
7880 sctp_socket_type_t type)
7881{
7882 struct sctp_sock *oldsp = sctp_sk(oldsk);
7883 struct sctp_sock *newsp = sctp_sk(newsk);
7884 struct sctp_bind_bucket *pp; /* hash list port iterator */
7885 struct sctp_endpoint *newep = newsp->ep;
7886 struct sk_buff *skb, *tmp;
7887 struct sctp_ulpevent *event;
Vlad Yasevichf26f7c42007-12-06 22:50:27 -08007888 struct sctp_bind_hashbucket *head;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007889
7890 /* Migrate socket buffer sizes and all the socket level options to the
7891 * new socket.
7892 */
7893 newsk->sk_sndbuf = oldsk->sk_sndbuf;
7894 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
7895 /* Brute force copy old sctp opt. */
Marcelo Ricardo Leitner2d45a022015-06-12 10:16:41 -03007896 sctp_copy_descendant(newsk, oldsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007897
7898 /* Restore the ep value that was overwritten with the above structure
7899 * copy.
7900 */
7901 newsp->ep = newep;
7902 newsp->hmac = NULL;
7903
7904 /* Hook this new socket in to the bind_hash list. */
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00007905 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
7906 inet_sk(oldsk)->inet_num)];
Nicholas Mc Guire489ce5f2016-03-13 11:48:24 +01007907 spin_lock_bh(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007908 pp = sctp_sk(oldsk)->bind_hash;
7909 sk_add_bind_node(newsk, &pp->owner);
7910 sctp_sk(newsk)->bind_hash = pp;
Eric Dumazetc720c7e82009-10-15 06:30:45 +00007911 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
Nicholas Mc Guire489ce5f2016-03-13 11:48:24 +01007912 spin_unlock_bh(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007913
Vladislav Yasevich4243cac2005-06-13 15:10:49 -07007914 /* Copy the bind_addr list from the original endpoint to the new
7915 * endpoint so that we can handle restarts properly
7916 */
Vlad Yasevich8e71a112007-12-06 22:50:54 -08007917 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
7918 &oldsp->ep->base.bind_addr, GFP_KERNEL);
Vladislav Yasevich4243cac2005-06-13 15:10:49 -07007919
Linus Torvalds1da177e2005-04-16 15:20:36 -07007920 /* Move any messages in the old socket's receive queue that are for the
7921 * peeled off association to the new socket's receive queue.
7922 */
7923 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
7924 event = sctp_skb2event(skb);
7925 if (event->asoc == assoc) {
David S. Miller8728b832005-08-09 19:25:21 -07007926 __skb_unlink(skb, &oldsk->sk_receive_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007927 __skb_queue_tail(&newsk->sk_receive_queue, skb);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007928 sctp_skb_set_owner_r_frag(skb, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007929 }
7930 }
7931
7932 /* Clean up any messages pending delivery due to partial
7933 * delivery. Three cases:
7934 * 1) No partial deliver; no work.
7935 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
7936 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
7937 */
7938 skb_queue_head_init(&newsp->pd_lobby);
Vlad Yasevichb6e13312007-04-20 12:23:15 -07007939 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007940
Vlad Yasevichb6e13312007-04-20 12:23:15 -07007941 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07007942 struct sk_buff_head *queue;
7943
7944 /* Decide which queue to move pd_lobby skbs to. */
7945 if (assoc->ulpq.pd_mode) {
7946 queue = &newsp->pd_lobby;
7947 } else
7948 queue = &newsk->sk_receive_queue;
7949
7950 /* Walk through the pd_lobby, looking for skbs that
7951 * need moved to the new socket.
7952 */
7953 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
7954 event = sctp_skb2event(skb);
7955 if (event->asoc == assoc) {
David S. Miller8728b832005-08-09 19:25:21 -07007956 __skb_unlink(skb, &oldsp->pd_lobby);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007957 __skb_queue_tail(queue, skb);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007958 sctp_skb_set_owner_r_frag(skb, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007959 }
7960 }
7961
7962 /* Clear up any skbs waiting for the partial
7963 * delivery to finish.
7964 */
7965 if (assoc->ulpq.pd_mode)
Vlad Yasevichb6e13312007-04-20 12:23:15 -07007966 sctp_clear_pd(oldsk, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007967
7968 }
7969
Wei Yongjun1bc4ee42009-07-05 19:45:48 +00007970 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007971 sctp_skb_set_owner_r_frag(skb, newsk);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007972
Wei Yongjun1bc4ee42009-07-05 19:45:48 +00007973 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007974 sctp_skb_set_owner_r_frag(skb, newsk);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007975
Linus Torvalds1da177e2005-04-16 15:20:36 -07007976 /* Set the type of socket to indicate that it is peeled off from the
7977 * original UDP-style socket or created with the accept() call on a
7978 * TCP-style socket..
7979 */
7980 newsp->type = type;
7981
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07007982 /* Mark the new socket "in-use" by the user so that any packets
7983 * that may arrive on the association after we've moved it are
7984 * queued to the backlog. This prevents a potential race between
7985 * backlog processing on the old socket and new-packet processing
7986 * on the new socket.
Zach Brown5131a182007-06-22 15:14:46 -07007987 *
7988 * The caller has just allocated newsk so we can guarantee that other
7989 * paths won't try to lock it and then oldsk.
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07007990 */
Zach Brown5131a182007-06-22 15:14:46 -07007991 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007992 sctp_assoc_migrate(assoc, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007993
7994 /* If the association on the newsk is already closed before accept()
7995 * is called, set RCV_SHUTDOWN flag.
7996 */
Xin Longd46e4162016-06-09 22:48:18 +08007997 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
Xin Long141ddef2016-06-16 01:15:06 +08007998 newsk->sk_state = SCTP_SS_CLOSED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07007999 newsk->sk_shutdown |= RCV_SHUTDOWN;
Xin Longd46e4162016-06-09 22:48:18 +08008000 } else {
8001 newsk->sk_state = SCTP_SS_ESTABLISHED;
8002 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07008003
wangweidong048ed4b2014-01-21 15:44:11 +08008004 release_sock(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07008005}
8006
Neil Horman4d93df02007-08-15 16:07:44 -07008007
Linus Torvalds1da177e2005-04-16 15:20:36 -07008008/* This proto struct describes the ULP interface for SCTP. */
8009struct proto sctp_prot = {
8010 .name = "SCTP",
8011 .owner = THIS_MODULE,
8012 .close = sctp_close,
8013 .connect = sctp_connect,
8014 .disconnect = sctp_disconnect,
8015 .accept = sctp_accept,
8016 .ioctl = sctp_ioctl,
8017 .init = sctp_init_sock,
8018 .destroy = sctp_destroy_sock,
8019 .shutdown = sctp_shutdown,
8020 .setsockopt = sctp_setsockopt,
8021 .getsockopt = sctp_getsockopt,
8022 .sendmsg = sctp_sendmsg,
8023 .recvmsg = sctp_recvmsg,
8024 .bind = sctp_bind,
8025 .backlog_rcv = sctp_backlog_rcv,
8026 .hash = sctp_hash,
8027 .unhash = sctp_unhash,
8028 .get_port = sctp_get_port,
8029 .obj_size = sizeof(struct sctp_sock),
Neil Horman4d93df02007-08-15 16:07:44 -07008030 .sysctl_mem = sysctl_sctp_mem,
8031 .sysctl_rmem = sysctl_sctp_rmem,
8032 .sysctl_wmem = sysctl_sctp_wmem,
8033 .memory_pressure = &sctp_memory_pressure,
8034 .enter_memory_pressure = sctp_enter_memory_pressure,
8035 .memory_allocated = &sctp_memory_allocated,
Pavel Emelyanov5f318862008-02-20 00:23:01 -08008036 .sockets_allocated = &sctp_sockets_allocated,
Linus Torvalds1da177e2005-04-16 15:20:36 -07008037};
8038
Eric Dumazetdfd56b82011-12-10 09:48:31 +00008039#if IS_ENABLED(CONFIG_IPV6)
Eric Dumazet8295b6d2007-11-05 23:40:28 -08008040
Eric Dumazet602dd622015-12-01 07:20:07 -08008041#include <net/transp_v6.h>
8042static void sctp_v6_destroy_sock(struct sock *sk)
8043{
8044 sctp_destroy_sock(sk);
8045 inet6_destroy_sock(sk);
8046}
8047
Linus Torvalds1da177e2005-04-16 15:20:36 -07008048struct proto sctpv6_prot = {
8049 .name = "SCTPv6",
8050 .owner = THIS_MODULE,
8051 .close = sctp_close,
8052 .connect = sctp_connect,
8053 .disconnect = sctp_disconnect,
8054 .accept = sctp_accept,
8055 .ioctl = sctp_ioctl,
8056 .init = sctp_init_sock,
Eric Dumazet602dd622015-12-01 07:20:07 -08008057 .destroy = sctp_v6_destroy_sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -07008058 .shutdown = sctp_shutdown,
8059 .setsockopt = sctp_setsockopt,
8060 .getsockopt = sctp_getsockopt,
8061 .sendmsg = sctp_sendmsg,
8062 .recvmsg = sctp_recvmsg,
8063 .bind = sctp_bind,
8064 .backlog_rcv = sctp_backlog_rcv,
8065 .hash = sctp_hash,
8066 .unhash = sctp_unhash,
8067 .get_port = sctp_get_port,
8068 .obj_size = sizeof(struct sctp6_sock),
Neil Horman4d93df02007-08-15 16:07:44 -07008069 .sysctl_mem = sysctl_sctp_mem,
8070 .sysctl_rmem = sysctl_sctp_rmem,
8071 .sysctl_wmem = sysctl_sctp_wmem,
8072 .memory_pressure = &sctp_memory_pressure,
8073 .enter_memory_pressure = sctp_enter_memory_pressure,
8074 .memory_allocated = &sctp_memory_allocated,
Pavel Emelyanov5f318862008-02-20 00:23:01 -08008075 .sockets_allocated = &sctp_sockets_allocated,
Linus Torvalds1da177e2005-04-16 15:20:36 -07008076};
Eric Dumazetdfd56b82011-12-10 09:48:31 +00008077#endif /* IS_ENABLED(CONFIG_IPV6) */