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Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
8 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05009 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
13 *
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
17 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050018 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
22 * any later version.
23 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050024 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
29 *
30 * You should have received a copy of the GNU General Public License
Jeff Kirsher4b2f13a2013-12-06 06:28:48 -080031 * along with GNU CC; see the file COPYING. If not, see
32 * <http://www.gnu.org/licenses/>.
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 *
34 * Please send any bug reports or fixes you make to the
35 * email address(es):
Daniel Borkmann91705c62013-07-23 14:51:47 +020036 * lksctp developers <linux-sctp@vger.kernel.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 * Written or modified by:
39 * La Monte H.P. Yarroll <piggy@acm.org>
40 * Narasimha Budihal <narsi@refcode.org>
41 * Karl Knutson <karl@athena.chicago.il.us>
42 * Jon Grimm <jgrimm@us.ibm.com>
43 * Xingang Guo <xingang.guo@intel.com>
44 * Daisy Chang <daisyc@us.ibm.com>
45 * Sridhar Samudrala <samudrala@us.ibm.com>
46 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
47 * Ardelle Fan <ardelle.fan@intel.com>
48 * Ryan Layer <rmlayer@us.ibm.com>
49 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
50 * Kevin Gao <kevin.gao@intel.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 */
52
Joe Perches145ce502010-08-24 13:21:08 +000053#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#include <linux/types.h>
56#include <linux/kernel.h>
57#include <linux/wait.h>
58#include <linux/time.h>
59#include <linux/ip.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080060#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <linux/fcntl.h>
62#include <linux/poll.h>
63#include <linux/init.h>
64#include <linux/crypto.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090065#include <linux/slab.h>
Al Viro56b31d12012-08-18 00:25:51 -040066#include <linux/file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68#include <net/ip.h>
69#include <net/icmp.h>
70#include <net/route.h>
71#include <net/ipv6.h>
72#include <net/inet_common.h>
73
74#include <linux/socket.h> /* for sa_family_t */
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040075#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#include <net/sock.h>
77#include <net/sctp/sctp.h>
78#include <net/sctp/sm.h>
79
Linus Torvalds1da177e2005-04-16 15:20:36 -070080/* Forward declarations for internal helper functions. */
81static int sctp_writeable(struct sock *sk);
82static void sctp_wfree(struct sk_buff *skb);
83static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
84 size_t msg_len);
85static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
86static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
87static int sctp_wait_for_accept(struct sock *sk, long timeo);
88static void sctp_wait_for_close(struct sock *sk, long timeo);
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +020089static void sctp_destruct_sock(struct sock *sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
91 union sctp_addr *addr, int len);
92static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
93static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
94static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
95static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
96static int sctp_send_asconf(struct sctp_association *asoc,
97 struct sctp_chunk *chunk);
98static int sctp_do_bind(struct sock *, union sctp_addr *, int);
99static int sctp_autobind(struct sock *sk);
100static void sctp_sock_migrate(struct sock *, struct sock *,
101 struct sctp_association *, sctp_socket_type_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Neil Horman4d93df02007-08-15 16:07:44 -0700103extern struct kmem_cache *sctp_bucket_cachep;
Eric Dumazet8d987e52010-11-09 23:24:26 +0000104extern long sysctl_sctp_mem[3];
Neil Horman4d93df02007-08-15 16:07:44 -0700105extern int sysctl_sctp_rmem[3];
106extern int sysctl_sctp_wmem[3];
107
Adrian Bunkb6fa1a42007-09-12 15:18:00 +0200108static int sctp_memory_pressure;
Eric Dumazet8d987e52010-11-09 23:24:26 +0000109static atomic_long_t sctp_memory_allocated;
Eric Dumazet17483762008-11-25 21:16:35 -0800110struct percpu_counter sctp_sockets_allocated;
Neil Horman4d93df02007-08-15 16:07:44 -0700111
Pavel Emelyanov5c52ba12008-07-16 20:28:10 -0700112static void sctp_enter_memory_pressure(struct sock *sk)
Neil Horman4d93df02007-08-15 16:07:44 -0700113{
114 sctp_memory_pressure = 1;
115}
116
117
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118/* Get the sndbuf space available at the time on the association. */
119static inline int sctp_wspace(struct sctp_association *asoc)
120{
Neil Horman4d93df02007-08-15 16:07:44 -0700121 int amt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Neil Horman4d93df02007-08-15 16:07:44 -0700123 if (asoc->ep->sndbuf_policy)
124 amt = asoc->sndbuf_used;
125 else
Eric Dumazet31e6d362009-06-17 19:05:41 -0700126 amt = sk_wmem_alloc_get(asoc->base.sk);
Neil Horman4d93df02007-08-15 16:07:44 -0700127
128 if (amt >= asoc->base.sk->sk_sndbuf) {
129 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
130 amt = 0;
131 else {
132 amt = sk_stream_wspace(asoc->base.sk);
133 if (amt < 0)
134 amt = 0;
135 }
Neil Horman4eb701d2005-04-28 12:02:04 -0700136 } else {
Neil Horman4d93df02007-08-15 16:07:44 -0700137 amt = asoc->base.sk->sk_sndbuf - amt;
Neil Horman4eb701d2005-04-28 12:02:04 -0700138 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 return amt;
140}
141
142/* Increment the used sndbuf space count of the corresponding association by
143 * the size of the outgoing data chunk.
144 * Also, set the skb destructor for sndbuf accounting later.
145 *
146 * Since it is always 1-1 between chunk and skb, and also a new skb is always
147 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
148 * destructor in the data chunk skb for the purpose of the sndbuf space
149 * tracking.
150 */
151static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
152{
153 struct sctp_association *asoc = chunk->asoc;
154 struct sock *sk = asoc->base.sk;
155
156 /* The sndbuf space is tracked per association. */
157 sctp_association_hold(asoc);
158
Neil Horman4eb701d2005-04-28 12:02:04 -0700159 skb_set_owner_w(chunk->skb, sk);
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 chunk->skb->destructor = sctp_wfree;
162 /* Save the chunk pointer in skb for sctp_wfree to use later. */
163 *((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
164
Neil Horman4eb701d2005-04-28 12:02:04 -0700165 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
166 sizeof(struct sk_buff) +
167 sizeof(struct sctp_chunk);
168
Neil Horman4eb701d2005-04-28 12:02:04 -0700169 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
Hideo Aoki3ab224b2007-12-31 00:11:19 -0800170 sk->sk_wmem_queued += chunk->skb->truesize;
171 sk_mem_charge(sk, chunk->skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172}
173
174/* Verify that this is a valid address. */
175static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
176 int len)
177{
178 struct sctp_af *af;
179
180 /* Verify basic sockaddr. */
181 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
182 if (!af)
183 return -EINVAL;
184
185 /* Is this a valid SCTP address? */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700186 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 return -EINVAL;
188
189 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
190 return -EINVAL;
191
192 return 0;
193}
194
195/* Look up the association by its id. If this is not a UDP-style
196 * socket, the ID field is always ignored.
197 */
198struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
199{
200 struct sctp_association *asoc = NULL;
201
202 /* If this is not a UDP-style socket, assoc id should be ignored. */
203 if (!sctp_style(sk, UDP)) {
204 /* Return NULL if the socket state is not ESTABLISHED. It
205 * could be a TCP-style listening socket or a socket which
206 * hasn't yet called connect() to establish an association.
207 */
208 if (!sctp_sstate(sk, ESTABLISHED))
209 return NULL;
210
211 /* Get the first and the only association from the list. */
212 if (!list_empty(&sctp_sk(sk)->ep->asocs))
213 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
214 struct sctp_association, asocs);
215 return asoc;
216 }
217
218 /* Otherwise this is a UDP-style socket. */
219 if (!id || (id == (sctp_assoc_t)-1))
220 return NULL;
221
222 spin_lock_bh(&sctp_assocs_id_lock);
223 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
224 spin_unlock_bh(&sctp_assocs_id_lock);
225
226 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
227 return NULL;
228
229 return asoc;
230}
231
232/* Look up the transport from an address and an assoc id. If both address and
233 * id are specified, the associations matching the address and the id should be
234 * the same.
235 */
236static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
237 struct sockaddr_storage *addr,
238 sctp_assoc_t id)
239{
240 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
241 struct sctp_transport *transport;
242 union sctp_addr *laddr = (union sctp_addr *)addr;
243
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
Al Virocd4ff032006-11-20 17:11:33 -0800245 laddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
248 if (!addr_asoc)
249 return NULL;
250
251 id_asoc = sctp_id2assoc(sk, id);
252 if (id_asoc && (id_asoc != addr_asoc))
253 return NULL;
254
255 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
256 (union sctp_addr *)addr);
257
258 return transport;
259}
260
261/* API 3.1.2 bind() - UDP Style Syntax
262 * The syntax of bind() is,
263 *
264 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
265 *
266 * sd - the socket descriptor returned by socket().
267 * addr - the address structure (struct sockaddr_in or struct
268 * sockaddr_in6 [RFC 2553]),
269 * addr_len - the size of the address structure.
270 */
Daniel Borkmanndda91922013-06-17 11:40:05 +0200271static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272{
273 int retval = 0;
274
275 sctp_lock_sock(sk);
276
Daniel Borkmannbb333812013-06-28 19:49:40 +0200277 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
278 addr, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
280 /* Disallow binding twice. */
281 if (!sctp_sk(sk)->ep->base.bind_addr.port)
Frank Filz3f7a87d2005-06-20 13:14:57 -0700282 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 addr_len);
284 else
285 retval = -EINVAL;
286
287 sctp_release_sock(sk);
288
289 return retval;
290}
291
292static long sctp_get_port_local(struct sock *, union sctp_addr *);
293
294/* Verify this is a valid sockaddr. */
295static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
296 union sctp_addr *addr, int len)
297{
298 struct sctp_af *af;
299
300 /* Check minimum size. */
301 if (len < sizeof (struct sockaddr))
302 return NULL;
303
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700304 /* V4 mapped address are really of AF_INET family */
305 if (addr->sa.sa_family == AF_INET6 &&
306 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
307 if (!opt->pf->af_supported(AF_INET, opt))
308 return NULL;
309 } else {
310 /* Does this PF support this AF? */
311 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
312 return NULL;
313 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315 /* If we get this far, af is valid. */
316 af = sctp_get_af_specific(addr->sa.sa_family);
317
318 if (len < af->sockaddr_len)
319 return NULL;
320
321 return af;
322}
323
324/* Bind a local address either to an endpoint or to an association. */
Daniel Borkmanndda91922013-06-17 11:40:05 +0200325static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326{
Eric W. Biederman35946982012-11-16 03:03:12 +0000327 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 struct sctp_sock *sp = sctp_sk(sk);
329 struct sctp_endpoint *ep = sp->ep;
330 struct sctp_bind_addr *bp = &ep->base.bind_addr;
331 struct sctp_af *af;
332 unsigned short snum;
333 int ret = 0;
334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 /* Common sockaddr verification. */
336 af = sctp_sockaddr_af(sp, addr, len);
Frank Filz3f7a87d2005-06-20 13:14:57 -0700337 if (!af) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200338 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
339 __func__, sk, addr, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 return -EINVAL;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700341 }
342
343 snum = ntohs(addr->v4.sin_port);
344
Daniel Borkmannbb333812013-06-28 19:49:40 +0200345 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
346 __func__, sk, &addr->sa, bp->port, snum, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
348 /* PF specific bind() address verification. */
349 if (!sp->pf->bind_verify(sp, addr))
350 return -EADDRNOTAVAIL;
351
Vlad Yasevich8b358052007-05-15 17:14:58 -0400352 /* We must either be unbound, or bind to the same port.
353 * It's OK to allow 0 ports if we are already bound.
354 * We'll just inhert an already bound port in this case
355 */
356 if (bp->port) {
357 if (!snum)
358 snum = bp->port;
359 else if (snum != bp->port) {
Daniel Borkmannbb333812013-06-28 19:49:40 +0200360 pr_debug("%s: new port %d doesn't match existing port "
361 "%d\n", __func__, snum, bp->port);
Vlad Yasevich8b358052007-05-15 17:14:58 -0400362 return -EINVAL;
363 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 }
365
Eric W. Biederman35946982012-11-16 03:03:12 +0000366 if (snum && snum < PROT_SOCK &&
367 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 return -EACCES;
369
Vlad Yasevich4e540642008-07-18 23:06:32 -0700370 /* See if the address matches any of the addresses we may have
371 * already bound before checking against other endpoints.
372 */
373 if (sctp_bind_addr_match(bp, addr, sp))
374 return -EINVAL;
375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 /* Make sure we are allowed to bind here.
377 * The function sctp_get_port_local() does duplicate address
378 * detection.
379 */
Vlad Yasevich2772b492007-08-21 14:24:30 +0900380 addr->v4.sin_port = htons(snum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 if ((ret = sctp_get_port_local(sk, addr))) {
Vlad Yasevich4e540642008-07-18 23:06:32 -0700382 return -EADDRINUSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 }
384
385 /* Refresh ephemeral port. */
386 if (!bp->port)
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000387 bp->port = inet_sk(sk)->inet_num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Vlad Yasevich559cf712007-09-16 16:03:28 -0700389 /* Add the address to the bind address list.
390 * Use GFP_ATOMIC since BHs will be disabled.
391 */
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800392 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
394 /* Copy back into socket for getsockname() use. */
395 if (!ret) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000396 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 af->to_sk_saddr(addr, sk);
398 }
399
400 return ret;
401}
402
403 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
404 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900405 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 * at any one time. If a sender, after sending an ASCONF chunk, decides
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900407 * it needs to transfer another ASCONF Chunk, it MUST wait until the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900409 * subsequent ASCONF. Note this restriction binds each side, so at any
410 * time two ASCONF may be in-transit on any given association (one sent
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 * from each endpoint).
412 */
413static int sctp_send_asconf(struct sctp_association *asoc,
414 struct sctp_chunk *chunk)
415{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000416 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 int retval = 0;
418
419 /* If there is an outstanding ASCONF chunk, queue it for later
420 * transmission.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900421 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 if (asoc->addip_last_asconf) {
David S. Miller79af02c2005-07-08 21:47:49 -0700423 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900424 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 }
426
427 /* Hold the chunk until an ASCONF_ACK is received. */
428 sctp_chunk_hold(chunk);
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000429 retval = sctp_primitive_ASCONF(net, asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 if (retval)
431 sctp_chunk_free(chunk);
432 else
433 asoc->addip_last_asconf = chunk;
434
435out:
436 return retval;
437}
438
439/* Add a list of addresses as bind addresses to local endpoint or
440 * association.
441 *
442 * Basically run through each address specified in the addrs/addrcnt
443 * array/length pair, determine if it is IPv6 or IPv4 and call
444 * sctp_do_bind() on it.
445 *
446 * If any of them fails, then the operation will be reversed and the
447 * ones that were added will be removed.
448 *
449 * Only sctp_setsockopt_bindx() is supposed to call this function.
450 */
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +0200451static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452{
453 int cnt;
454 int retval = 0;
455 void *addr_buf;
456 struct sockaddr *sa_addr;
457 struct sctp_af *af;
458
Daniel Borkmannbb333812013-06-28 19:49:40 +0200459 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
460 addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
462 addr_buf = addrs;
463 for (cnt = 0; cnt < addrcnt; cnt++) {
464 /* The list may contain either IPv4 or IPv6 address;
465 * determine the address length for walking thru the list.
466 */
Joe Perchesea110732011-06-13 16:21:26 +0000467 sa_addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 af = sctp_get_af_specific(sa_addr->sa_family);
469 if (!af) {
470 retval = -EINVAL;
471 goto err_bindx_add;
472 }
473
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900474 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 af->sockaddr_len);
476
477 addr_buf += af->sockaddr_len;
478
479err_bindx_add:
480 if (retval < 0) {
481 /* Failed. Cleanup the ones that have been added */
482 if (cnt > 0)
483 sctp_bindx_rem(sk, addrs, cnt);
484 return retval;
485 }
486 }
487
488 return retval;
489}
490
491/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
492 * associations that are part of the endpoint indicating that a list of local
493 * addresses are added to the endpoint.
494 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900495 * If any of the addresses is already in the bind address list of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 * association, we do not send the chunk for that association. But it will not
497 * affect other associations.
498 *
499 * Only sctp_setsockopt_bindx() is supposed to call this function.
500 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900501static int sctp_send_asconf_add_ip(struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 struct sockaddr *addrs,
503 int addrcnt)
504{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000505 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 struct sctp_sock *sp;
507 struct sctp_endpoint *ep;
508 struct sctp_association *asoc;
509 struct sctp_bind_addr *bp;
510 struct sctp_chunk *chunk;
511 struct sctp_sockaddr_entry *laddr;
512 union sctp_addr *addr;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700513 union sctp_addr saveaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 void *addr_buf;
515 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 struct list_head *p;
517 int i;
518 int retval = 0;
519
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000520 if (!net->sctp.addip_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 return retval;
522
523 sp = sctp_sk(sk);
524 ep = sp->ep;
525
Daniel Borkmannbb333812013-06-28 19:49:40 +0200526 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
527 __func__, sk, addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700529 list_for_each_entry(asoc, &ep->asocs, asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 if (!asoc->peer.asconf_capable)
531 continue;
532
533 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
534 continue;
535
536 if (!sctp_state(asoc, ESTABLISHED))
537 continue;
538
539 /* Check if any address in the packed array of addresses is
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900540 * in the bind address list of the association. If so,
541 * do not send the asconf chunk to its peer, but continue with
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 * other associations.
543 */
544 addr_buf = addrs;
545 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000546 addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 af = sctp_get_af_specific(addr->v4.sin_family);
548 if (!af) {
549 retval = -EINVAL;
550 goto out;
551 }
552
553 if (sctp_assoc_lookup_laddr(asoc, addr))
554 break;
555
556 addr_buf += af->sockaddr_len;
557 }
558 if (i < addrcnt)
559 continue;
560
Vlad Yasevich559cf712007-09-16 16:03:28 -0700561 /* Use the first valid address in bind addr list of
562 * association as Address Parameter of ASCONF CHUNK.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 bp = &asoc->base.bind_addr;
565 p = bp->address_list.next;
566 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
Al Viro5ae955c2006-11-20 17:22:08 -0800567 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 addrcnt, SCTP_PARAM_ADD_IP);
569 if (!chunk) {
570 retval = -ENOMEM;
571 goto out;
572 }
573
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700574 /* Add the new addresses to the bind address list with
575 * use_as_src set to 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 */
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700577 addr_buf = addrs;
578 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000579 addr = addr_buf;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700580 af = sctp_get_af_specific(addr->v4.sin_family);
581 memcpy(&saveaddr, addr, af->sockaddr_len);
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800582 retval = sctp_add_bind_addr(bp, &saveaddr,
583 SCTP_ADDR_NEW, GFP_ATOMIC);
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700584 addr_buf += af->sockaddr_len;
585 }
Michio Honda8a07eb02011-04-26 20:19:36 +0900586 if (asoc->src_out_of_asoc_ok) {
587 struct sctp_transport *trans;
588
589 list_for_each_entry(trans,
590 &asoc->peer.transport_addr_list, transports) {
591 /* Clear the source and route cache */
592 dst_release(trans->dst);
593 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
594 2*asoc->pathmtu, 4380));
595 trans->ssthresh = asoc->peer.i.a_rwnd;
596 trans->rto = asoc->rto_initial;
Michele Baldessari196d6752012-12-01 04:49:42 +0000597 sctp_max_rto(asoc, trans);
Michio Honda8a07eb02011-04-26 20:19:36 +0900598 trans->rtt = trans->srtt = trans->rttvar = 0;
599 sctp_transport_route(trans, NULL,
600 sctp_sk(asoc->base.sk));
601 }
602 }
603 retval = sctp_send_asconf(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 }
605
606out:
607 return retval;
608}
609
610/* Remove a list of addresses from bind addresses list. Do not remove the
611 * last address.
612 *
613 * Basically run through each address specified in the addrs/addrcnt
614 * array/length pair, determine if it is IPv6 or IPv4 and call
615 * sctp_del_bind() on it.
616 *
617 * If any of them fails, then the operation will be reversed and the
618 * ones that were removed will be added back.
619 *
620 * At least one address has to be left; if only one address is
621 * available, the operation will return -EBUSY.
622 *
623 * Only sctp_setsockopt_bindx() is supposed to call this function.
624 */
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +0200625static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626{
627 struct sctp_sock *sp = sctp_sk(sk);
628 struct sctp_endpoint *ep = sp->ep;
629 int cnt;
630 struct sctp_bind_addr *bp = &ep->base.bind_addr;
631 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 void *addr_buf;
Al Viroc9a08502006-11-20 17:07:48 -0800633 union sctp_addr *sa_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 struct sctp_af *af;
635
Daniel Borkmannbb333812013-06-28 19:49:40 +0200636 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
637 __func__, sk, addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
639 addr_buf = addrs;
640 for (cnt = 0; cnt < addrcnt; cnt++) {
641 /* If the bind address list is empty or if there is only one
642 * bind address, there is nothing more to be removed (we need
643 * at least one address here).
644 */
645 if (list_empty(&bp->address_list) ||
646 (sctp_list_single_entry(&bp->address_list))) {
647 retval = -EBUSY;
648 goto err_bindx_rem;
649 }
650
Joe Perchesea110732011-06-13 16:21:26 +0000651 sa_addr = addr_buf;
Al Viroc9a08502006-11-20 17:07:48 -0800652 af = sctp_get_af_specific(sa_addr->sa.sa_family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 if (!af) {
654 retval = -EINVAL;
655 goto err_bindx_rem;
656 }
Paolo Galtieri0304ff8a2007-04-17 12:52:36 -0700657
658 if (!af->addr_valid(sa_addr, sp, NULL)) {
659 retval = -EADDRNOTAVAIL;
660 goto err_bindx_rem;
661 }
662
Vlad Yasevichee9cbac2011-04-18 19:14:47 +0000663 if (sa_addr->v4.sin_port &&
664 sa_addr->v4.sin_port != htons(bp->port)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 retval = -EINVAL;
666 goto err_bindx_rem;
667 }
668
Vlad Yasevichee9cbac2011-04-18 19:14:47 +0000669 if (!sa_addr->v4.sin_port)
670 sa_addr->v4.sin_port = htons(bp->port);
671
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 /* FIXME - There is probably a need to check if sk->sk_saddr and
673 * sk->sk_rcv_addr are currently set to one of the addresses to
674 * be removed. This is something which needs to be looked into
675 * when we are fixing the outstanding issues with multi-homing
676 * socket routing and failover schemes. Refer to comments in
677 * sctp_do_bind(). -daisy
678 */
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -0400679 retval = sctp_del_bind_addr(bp, sa_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
681 addr_buf += af->sockaddr_len;
682err_bindx_rem:
683 if (retval < 0) {
684 /* Failed. Add the ones that has been removed back */
685 if (cnt > 0)
686 sctp_bindx_add(sk, addrs, cnt);
687 return retval;
688 }
689 }
690
691 return retval;
692}
693
694/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
695 * the associations that are part of the endpoint indicating that a list of
696 * local addresses are removed from the endpoint.
697 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900698 * If any of the addresses is already in the bind address list of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 * association, we do not send the chunk for that association. But it will not
700 * affect other associations.
701 *
702 * Only sctp_setsockopt_bindx() is supposed to call this function.
703 */
704static int sctp_send_asconf_del_ip(struct sock *sk,
705 struct sockaddr *addrs,
706 int addrcnt)
707{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000708 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 struct sctp_sock *sp;
710 struct sctp_endpoint *ep;
711 struct sctp_association *asoc;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700712 struct sctp_transport *transport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 struct sctp_bind_addr *bp;
714 struct sctp_chunk *chunk;
715 union sctp_addr *laddr;
716 void *addr_buf;
717 struct sctp_af *af;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700718 struct sctp_sockaddr_entry *saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 int i;
720 int retval = 0;
Michio Honda8a07eb02011-04-26 20:19:36 +0900721 int stored = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
Michio Honda8a07eb02011-04-26 20:19:36 +0900723 chunk = NULL;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000724 if (!net->sctp.addip_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 return retval;
726
727 sp = sctp_sk(sk);
728 ep = sp->ep;
729
Daniel Borkmannbb333812013-06-28 19:49:40 +0200730 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
731 __func__, sk, addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700733 list_for_each_entry(asoc, &ep->asocs, asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
735 if (!asoc->peer.asconf_capable)
736 continue;
737
738 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
739 continue;
740
741 if (!sctp_state(asoc, ESTABLISHED))
742 continue;
743
744 /* Check if any address in the packed array of addresses is
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900745 * not present in the bind address list of the association.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 * If so, do not send the asconf chunk to its peer, but
747 * continue with other associations.
748 */
749 addr_buf = addrs;
750 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000751 laddr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 af = sctp_get_af_specific(laddr->v4.sin_family);
753 if (!af) {
754 retval = -EINVAL;
755 goto out;
756 }
757
758 if (!sctp_assoc_lookup_laddr(asoc, laddr))
759 break;
760
761 addr_buf += af->sockaddr_len;
762 }
763 if (i < addrcnt)
764 continue;
765
766 /* Find one address in the association's bind address list
767 * that is not in the packed array of addresses. This is to
768 * make sure that we do not delete all the addresses in the
769 * association.
770 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 bp = &asoc->base.bind_addr;
772 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
773 addrcnt, sp);
Michio Honda8a07eb02011-04-26 20:19:36 +0900774 if ((laddr == NULL) && (addrcnt == 1)) {
775 if (asoc->asconf_addr_del_pending)
776 continue;
777 asoc->asconf_addr_del_pending =
778 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
Michio Honda6d65e5e2011-06-10 16:42:14 +0900779 if (asoc->asconf_addr_del_pending == NULL) {
780 retval = -ENOMEM;
781 goto out;
782 }
Michio Honda8a07eb02011-04-26 20:19:36 +0900783 asoc->asconf_addr_del_pending->sa.sa_family =
784 addrs->sa_family;
785 asoc->asconf_addr_del_pending->v4.sin_port =
786 htons(bp->port);
787 if (addrs->sa_family == AF_INET) {
788 struct sockaddr_in *sin;
789
790 sin = (struct sockaddr_in *)addrs;
791 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
792 } else if (addrs->sa_family == AF_INET6) {
793 struct sockaddr_in6 *sin6;
794
795 sin6 = (struct sockaddr_in6 *)addrs;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000796 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
Michio Honda8a07eb02011-04-26 20:19:36 +0900797 }
Daniel Borkmannbb333812013-06-28 19:49:40 +0200798
799 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
800 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
801 asoc->asconf_addr_del_pending);
802
Michio Honda8a07eb02011-04-26 20:19:36 +0900803 asoc->src_out_of_asoc_ok = 1;
804 stored = 1;
805 goto skip_mkasconf;
806 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
Daniel Borkmann88362ad2013-09-07 20:51:21 +0200808 if (laddr == NULL)
809 return -EINVAL;
810
Vlad Yasevich559cf712007-09-16 16:03:28 -0700811 /* We do not need RCU protection throughout this loop
812 * because this is done under a socket lock from the
813 * setsockopt call.
814 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
816 SCTP_PARAM_DEL_IP);
817 if (!chunk) {
818 retval = -ENOMEM;
819 goto out;
820 }
821
Michio Honda8a07eb02011-04-26 20:19:36 +0900822skip_mkasconf:
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700823 /* Reset use_as_src flag for the addresses in the bind address
824 * list that are to be deleted.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 */
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700826 addr_buf = addrs;
827 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000828 laddr = addr_buf;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700829 af = sctp_get_af_specific(laddr->v4.sin_family);
Vlad Yasevich559cf712007-09-16 16:03:28 -0700830 list_for_each_entry(saddr, &bp->address_list, list) {
Al Viro5f242a12006-11-20 17:05:23 -0800831 if (sctp_cmp_addr_exact(&saddr->a, laddr))
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800832 saddr->state = SCTP_ADDR_DEL;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700833 }
834 addr_buf += af->sockaddr_len;
835 }
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700836
837 /* Update the route and saddr entries for all the transports
838 * as some of the addresses in the bind address list are
839 * about to be deleted and cannot be used as source addresses.
840 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700841 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
842 transports) {
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700843 dst_release(transport->dst);
844 sctp_transport_route(transport, NULL,
845 sctp_sk(asoc->base.sk));
846 }
847
Michio Honda8a07eb02011-04-26 20:19:36 +0900848 if (stored)
849 /* We don't need to transmit ASCONF */
850 continue;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700851 retval = sctp_send_asconf(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 }
853out:
854 return retval;
855}
856
Michio Honda9f7d6532011-04-26 19:32:51 +0900857/* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
858int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
859{
860 struct sock *sk = sctp_opt2sk(sp);
861 union sctp_addr *addr;
862 struct sctp_af *af;
863
864 /* It is safe to write port space in caller. */
865 addr = &addrw->a;
866 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
867 af = sctp_get_af_specific(addr->sa.sa_family);
868 if (!af)
869 return -EINVAL;
870 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
871 return -EINVAL;
872
873 if (addrw->state == SCTP_ADDR_NEW)
874 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
875 else
876 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
877}
878
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
880 *
881 * API 8.1
882 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
883 * int flags);
884 *
885 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
886 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
887 * or IPv6 addresses.
888 *
889 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
890 * Section 3.1.2 for this usage.
891 *
892 * addrs is a pointer to an array of one or more socket addresses. Each
893 * address is contained in its appropriate structure (i.e. struct
894 * sockaddr_in or struct sockaddr_in6) the family of the address type
Ville Nuorvala23c435f2006-10-16 22:08:28 -0700895 * must be used to distinguish the address length (note that this
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 * representation is termed a "packed array" of addresses). The caller
897 * specifies the number of addresses in the array with addrcnt.
898 *
899 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
900 * -1, and sets errno to the appropriate error code.
901 *
902 * For SCTP, the port given in each socket address must be the same, or
903 * sctp_bindx() will fail, setting errno to EINVAL.
904 *
905 * The flags parameter is formed from the bitwise OR of zero or more of
906 * the following currently defined flags:
907 *
908 * SCTP_BINDX_ADD_ADDR
909 *
910 * SCTP_BINDX_REM_ADDR
911 *
912 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
913 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
914 * addresses from the association. The two flags are mutually exclusive;
915 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
916 * not remove all addresses from an association; sctp_bindx() will
917 * reject such an attempt with EINVAL.
918 *
919 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
920 * additional addresses with an endpoint after calling bind(). Or use
921 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
922 * socket is associated with so that no new association accepted will be
923 * associated with those addresses. If the endpoint supports dynamic
924 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
925 * endpoint to send the appropriate message to the peer to change the
926 * peers address lists.
927 *
928 * Adding and removing addresses from a connected association is
929 * optional functionality. Implementations that do not support this
930 * functionality should return EOPNOTSUPP.
931 *
932 * Basically do nothing but copying the addresses from user to kernel
933 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
Frank Filz3f7a87d2005-06-20 13:14:57 -0700934 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
935 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 *
937 * We don't use copy_from_user() for optimization: we first do the
938 * sanity checks (buffer size -fast- and access check-healthy
939 * pointer); if all of those succeed, then we can alloc the memory
940 * (expensive operation) needed to copy the data to kernel. Then we do
941 * the copying without checking the user space area
942 * (__copy_from_user()).
943 *
944 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
945 * it.
946 *
947 * sk The sk of the socket
948 * addrs The pointer to the addresses in user land
949 * addrssize Size of the addrs buffer
950 * op Operation to perform (add or remove, see the flags of
951 * sctp_bindx)
952 *
953 * Returns 0 if ok, <0 errno code on error.
954 */
Daniel Borkmanndda91922013-06-17 11:40:05 +0200955static int sctp_setsockopt_bindx(struct sock* sk,
956 struct sockaddr __user *addrs,
957 int addrs_size, int op)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958{
959 struct sockaddr *kaddrs;
960 int err;
961 int addrcnt = 0;
962 int walk_size = 0;
963 struct sockaddr *sa_addr;
964 void *addr_buf;
965 struct sctp_af *af;
966
Daniel Borkmannbb333812013-06-28 19:49:40 +0200967 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
968 __func__, sk, addrs, addrs_size, op);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
970 if (unlikely(addrs_size <= 0))
971 return -EINVAL;
972
973 /* Check the user passed a healthy pointer. */
974 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
975 return -EFAULT;
976
977 /* Alloc space for the address array in kernel memory. */
Kris Katterjohn8b3a7002006-01-11 15:56:43 -0800978 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 if (unlikely(!kaddrs))
980 return -ENOMEM;
981
982 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
983 kfree(kaddrs);
984 return -EFAULT;
985 }
986
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900987 /* Walk through the addrs buffer and count the number of addresses. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 addr_buf = kaddrs;
989 while (walk_size < addrs_size) {
Dan Rosenbergd7e0d192010-10-01 11:16:58 +0000990 if (walk_size + sizeof(sa_family_t) > addrs_size) {
991 kfree(kaddrs);
992 return -EINVAL;
993 }
994
Joe Perchesea110732011-06-13 16:21:26 +0000995 sa_addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 af = sctp_get_af_specific(sa_addr->sa_family);
997
998 /* If the address family is not supported or if this address
999 * causes the address buffer to overflow return EINVAL.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001000 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1002 kfree(kaddrs);
1003 return -EINVAL;
1004 }
1005 addrcnt++;
1006 addr_buf += af->sockaddr_len;
1007 walk_size += af->sockaddr_len;
1008 }
1009
1010 /* Do the work. */
1011 switch (op) {
1012 case SCTP_BINDX_ADD_ADDR:
1013 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1014 if (err)
1015 goto out;
1016 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1017 break;
1018
1019 case SCTP_BINDX_REM_ADDR:
1020 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1021 if (err)
1022 goto out;
1023 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1024 break;
1025
1026 default:
1027 err = -EINVAL;
1028 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001029 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030
1031out:
1032 kfree(kaddrs);
1033
1034 return err;
1035}
1036
Frank Filz3f7a87d2005-06-20 13:14:57 -07001037/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1038 *
1039 * Common routine for handling connect() and sctp_connectx().
1040 * Connect will come in with just a single address.
1041 */
1042static int __sctp_connect(struct sock* sk,
1043 struct sockaddr *kaddrs,
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001044 int addrs_size,
1045 sctp_assoc_t *assoc_id)
Frank Filz3f7a87d2005-06-20 13:14:57 -07001046{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001047 struct net *net = sock_net(sk);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001048 struct sctp_sock *sp;
1049 struct sctp_endpoint *ep;
1050 struct sctp_association *asoc = NULL;
1051 struct sctp_association *asoc2;
1052 struct sctp_transport *transport;
1053 union sctp_addr to;
1054 struct sctp_af *af;
1055 sctp_scope_t scope;
1056 long timeo;
1057 int err = 0;
1058 int addrcnt = 0;
1059 int walk_size = 0;
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001060 union sctp_addr *sa_addr = NULL;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001061 void *addr_buf;
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001062 unsigned short port;
Vlad Yasevichf50f95c2007-07-03 12:47:40 -04001063 unsigned int f_flags = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001064
1065 sp = sctp_sk(sk);
1066 ep = sp->ep;
1067
1068 /* connect() cannot be done on a socket that is already in ESTABLISHED
1069 * state - UDP-style peeled off socket or a TCP-style socket that
1070 * is already connected.
1071 * It cannot be done even on a TCP-style listening socket.
1072 */
1073 if (sctp_sstate(sk, ESTABLISHED) ||
1074 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1075 err = -EISCONN;
1076 goto out_free;
1077 }
1078
1079 /* Walk through the addrs buffer and count the number of addresses. */
1080 addr_buf = kaddrs;
1081 while (walk_size < addrs_size) {
Dan Rosenbergd7e0d192010-10-01 11:16:58 +00001082 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1083 err = -EINVAL;
1084 goto out_free;
1085 }
1086
Joe Perchesea110732011-06-13 16:21:26 +00001087 sa_addr = addr_buf;
Al Viro4bdf4b52006-11-20 17:10:20 -08001088 af = sctp_get_af_specific(sa_addr->sa.sa_family);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001089
1090 /* If the address family is not supported or if this address
1091 * causes the address buffer to overflow return EINVAL.
1092 */
1093 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1094 err = -EINVAL;
1095 goto out_free;
1096 }
1097
Dan Rosenbergd7e0d192010-10-01 11:16:58 +00001098 port = ntohs(sa_addr->v4.sin_port);
1099
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001100 /* Save current address so we can work with it */
1101 memcpy(&to, sa_addr, af->sockaddr_len);
1102
1103 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001104 if (err)
1105 goto out_free;
1106
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001107 /* Make sure the destination port is correctly set
1108 * in all addresses.
1109 */
Wei Yongjun524fba62013-04-03 03:02:28 +00001110 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1111 err = -EINVAL;
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001112 goto out_free;
Wei Yongjun524fba62013-04-03 03:02:28 +00001113 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001114
1115 /* Check if there already is a matching association on the
1116 * endpoint (other than the one created here).
1117 */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001118 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001119 if (asoc2 && asoc2 != asoc) {
1120 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1121 err = -EISCONN;
1122 else
1123 err = -EALREADY;
1124 goto out_free;
1125 }
1126
1127 /* If we could not find a matching association on the endpoint,
1128 * make sure that there is no peeled-off association matching
1129 * the peer address even on another socket.
1130 */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001131 if (sctp_endpoint_is_peeled_off(ep, &to)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -07001132 err = -EADDRNOTAVAIL;
1133 goto out_free;
1134 }
1135
1136 if (!asoc) {
1137 /* If a bind() or sctp_bindx() is not called prior to
1138 * an sctp_connectx() call, the system picks an
1139 * ephemeral port and will choose an address set
1140 * equivalent to binding with a wildcard address.
1141 */
1142 if (!ep->base.bind_addr.port) {
1143 if (sctp_autobind(sk)) {
1144 err = -EAGAIN;
1145 goto out_free;
1146 }
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001147 } else {
1148 /*
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001149 * If an unprivileged user inherits a 1-many
1150 * style socket with open associations on a
1151 * privileged port, it MAY be permitted to
1152 * accept new associations, but it SHOULD NOT
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001153 * be permitted to open new associations.
1154 */
1155 if (ep->base.bind_addr.port < PROT_SOCK &&
Eric W. Biederman35946982012-11-16 03:03:12 +00001156 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001157 err = -EACCES;
1158 goto out_free;
1159 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001160 }
1161
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001162 scope = sctp_scope(&to);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001163 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1164 if (!asoc) {
1165 err = -ENOMEM;
1166 goto out_free;
1167 }
Vlad Yasevich409b95a2009-11-10 08:57:34 +00001168
1169 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1170 GFP_KERNEL);
1171 if (err < 0) {
1172 goto out_free;
1173 }
1174
Frank Filz3f7a87d2005-06-20 13:14:57 -07001175 }
1176
1177 /* Prime the peer's transport structures. */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001178 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001179 SCTP_UNKNOWN);
1180 if (!transport) {
1181 err = -ENOMEM;
1182 goto out_free;
1183 }
1184
1185 addrcnt++;
1186 addr_buf += af->sockaddr_len;
1187 walk_size += af->sockaddr_len;
1188 }
1189
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001190 /* In case the user of sctp_connectx() wants an association
1191 * id back, assign one now.
1192 */
1193 if (assoc_id) {
1194 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1195 if (err < 0)
1196 goto out_free;
1197 }
1198
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001199 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001200 if (err < 0) {
1201 goto out_free;
1202 }
1203
1204 /* Initialize sk's dport and daddr for getpeername() */
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001205 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001206 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1207 af->to_sk_daddr(sa_addr, sk);
Sridhar Samudrala8de8c872006-05-19 10:58:12 -07001208 sk->sk_err = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001209
Vlad Yasevichf50f95c2007-07-03 12:47:40 -04001210 /* in-kernel sockets don't generally have a file allocated to them
1211 * if all they do is call sock_create_kern().
1212 */
1213 if (sk->sk_socket->file)
1214 f_flags = sk->sk_socket->file->f_flags;
1215
1216 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1217
Frank Filz3f7a87d2005-06-20 13:14:57 -07001218 err = sctp_wait_for_connect(asoc, &timeo);
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001219 if ((err == 0 || err == -EINPROGRESS) && assoc_id)
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001220 *assoc_id = asoc->assoc_id;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001221
1222 /* Don't free association on exit. */
1223 asoc = NULL;
1224
1225out_free:
Daniel Borkmannbb333812013-06-28 19:49:40 +02001226 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1227 __func__, asoc, kaddrs, err);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001228
Neil Horman2eebc1e2012-07-16 09:13:51 +00001229 if (asoc) {
1230 /* sctp_primitive_ASSOCIATE may have added this association
1231 * To the hash table, try to unhash it, just in case, its a noop
1232 * if it wasn't hashed so we're safe
1233 */
1234 sctp_unhash_established(asoc);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001235 sctp_association_free(asoc);
Neil Horman2eebc1e2012-07-16 09:13:51 +00001236 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001237 return err;
1238}
1239
1240/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1241 *
1242 * API 8.9
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001243 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1244 * sctp_assoc_t *asoc);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001245 *
1246 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1247 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1248 * or IPv6 addresses.
1249 *
1250 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1251 * Section 3.1.2 for this usage.
1252 *
1253 * addrs is a pointer to an array of one or more socket addresses. Each
1254 * address is contained in its appropriate structure (i.e. struct
1255 * sockaddr_in or struct sockaddr_in6) the family of the address type
1256 * must be used to distengish the address length (note that this
1257 * representation is termed a "packed array" of addresses). The caller
1258 * specifies the number of addresses in the array with addrcnt.
1259 *
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001260 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1261 * the association id of the new association. On failure, sctp_connectx()
1262 * returns -1, and sets errno to the appropriate error code. The assoc_id
1263 * is not touched by the kernel.
Frank Filz3f7a87d2005-06-20 13:14:57 -07001264 *
1265 * For SCTP, the port given in each socket address must be the same, or
1266 * sctp_connectx() will fail, setting errno to EINVAL.
1267 *
1268 * An application can use sctp_connectx to initiate an association with
1269 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1270 * allows a caller to specify multiple addresses at which a peer can be
1271 * reached. The way the SCTP stack uses the list of addresses to set up
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001272 * the association is implementation dependent. This function only
Frank Filz3f7a87d2005-06-20 13:14:57 -07001273 * specifies that the stack will try to make use of all the addresses in
1274 * the list when needed.
1275 *
1276 * Note that the list of addresses passed in is only used for setting up
1277 * the association. It does not necessarily equal the set of addresses
1278 * the peer uses for the resulting association. If the caller wants to
1279 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1280 * retrieve them after the association has been set up.
1281 *
1282 * Basically do nothing but copying the addresses from user to kernel
1283 * land and invoking either sctp_connectx(). This is used for tunneling
1284 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1285 *
1286 * We don't use copy_from_user() for optimization: we first do the
1287 * sanity checks (buffer size -fast- and access check-healthy
1288 * pointer); if all of those succeed, then we can alloc the memory
1289 * (expensive operation) needed to copy the data to kernel. Then we do
1290 * the copying without checking the user space area
1291 * (__copy_from_user()).
1292 *
1293 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1294 * it.
1295 *
1296 * sk The sk of the socket
1297 * addrs The pointer to the addresses in user land
1298 * addrssize Size of the addrs buffer
1299 *
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001300 * Returns >=0 if ok, <0 errno code on error.
Frank Filz3f7a87d2005-06-20 13:14:57 -07001301 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02001302static int __sctp_setsockopt_connectx(struct sock* sk,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001303 struct sockaddr __user *addrs,
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001304 int addrs_size,
1305 sctp_assoc_t *assoc_id)
Frank Filz3f7a87d2005-06-20 13:14:57 -07001306{
1307 int err = 0;
1308 struct sockaddr *kaddrs;
1309
Daniel Borkmannbb333812013-06-28 19:49:40 +02001310 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1311 __func__, sk, addrs, addrs_size);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001312
1313 if (unlikely(addrs_size <= 0))
1314 return -EINVAL;
1315
1316 /* Check the user passed a healthy pointer. */
1317 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1318 return -EFAULT;
1319
1320 /* Alloc space for the address array in kernel memory. */
Kris Katterjohn8b3a7002006-01-11 15:56:43 -08001321 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001322 if (unlikely(!kaddrs))
1323 return -ENOMEM;
1324
1325 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1326 err = -EFAULT;
1327 } else {
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001328 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001329 }
1330
1331 kfree(kaddrs);
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001332
Frank Filz3f7a87d2005-06-20 13:14:57 -07001333 return err;
1334}
1335
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001336/*
1337 * This is an older interface. It's kept for backward compatibility
1338 * to the option that doesn't provide association id.
1339 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02001340static int sctp_setsockopt_connectx_old(struct sock* sk,
1341 struct sockaddr __user *addrs,
1342 int addrs_size)
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001343{
1344 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1345}
1346
1347/*
1348 * New interface for the API. The since the API is done with a socket
1349 * option, to make it simple we feed back the association id is as a return
1350 * indication to the call. Error is always negative and association id is
1351 * always positive.
1352 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02001353static int sctp_setsockopt_connectx(struct sock* sk,
1354 struct sockaddr __user *addrs,
1355 int addrs_size)
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001356{
1357 sctp_assoc_t assoc_id = 0;
1358 int err = 0;
1359
1360 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1361
1362 if (err)
1363 return err;
1364 else
1365 return assoc_id;
1366}
1367
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001368/*
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001369 * New (hopefully final) interface for the API.
1370 * We use the sctp_getaddrs_old structure so that use-space library
1371 * can avoid any unnecessary allocations. The only defferent part
1372 * is that we store the actual length of the address buffer into the
1373 * addrs_num structure member. That way we can re-use the existing
1374 * code.
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001375 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02001376static int sctp_getsockopt_connectx3(struct sock* sk, int len,
1377 char __user *optval,
1378 int __user *optlen)
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001379{
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001380 struct sctp_getaddrs_old param;
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001381 sctp_assoc_t assoc_id = 0;
1382 int err = 0;
1383
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001384 if (len < sizeof(param))
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001385 return -EINVAL;
1386
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001387 if (copy_from_user(&param, optval, sizeof(param)))
1388 return -EFAULT;
1389
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001390 err = __sctp_setsockopt_connectx(sk,
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001391 (struct sockaddr __user *)param.addrs,
1392 param.addr_num, &assoc_id);
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001393
1394 if (err == 0 || err == -EINPROGRESS) {
1395 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1396 return -EFAULT;
1397 if (put_user(sizeof(assoc_id), optlen))
1398 return -EFAULT;
1399 }
1400
1401 return err;
1402}
1403
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404/* API 3.1.4 close() - UDP Style Syntax
1405 * Applications use close() to perform graceful shutdown (as described in
1406 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1407 * by a UDP-style socket.
1408 *
1409 * The syntax is
1410 *
1411 * ret = close(int sd);
1412 *
1413 * sd - the socket descriptor of the associations to be closed.
1414 *
1415 * To gracefully shutdown a specific association represented by the
1416 * UDP-style socket, an application should use the sendmsg() call,
1417 * passing no user data, but including the appropriate flag in the
1418 * ancillary data (see Section xxxx).
1419 *
1420 * If sd in the close() call is a branched-off socket representing only
1421 * one association, the shutdown is performed on that association only.
1422 *
1423 * 4.1.6 close() - TCP Style Syntax
1424 *
1425 * Applications use close() to gracefully close down an association.
1426 *
1427 * The syntax is:
1428 *
1429 * int close(int sd);
1430 *
1431 * sd - the socket descriptor of the association to be closed.
1432 *
1433 * After an application calls close() on a socket descriptor, no further
1434 * socket operations will succeed on that descriptor.
1435 *
1436 * API 7.1.4 SO_LINGER
1437 *
1438 * An application using the TCP-style socket can use this option to
1439 * perform the SCTP ABORT primitive. The linger option structure is:
1440 *
1441 * struct linger {
1442 * int l_onoff; // option on/off
1443 * int l_linger; // linger time
1444 * };
1445 *
1446 * To enable the option, set l_onoff to 1. If the l_linger value is set
1447 * to 0, calling close() is the same as the ABORT primitive. If the
1448 * value is set to a negative value, the setsockopt() call will return
1449 * an error. If the value is set to a positive value linger_time, the
1450 * close() can be blocked for at most linger_time ms. If the graceful
1451 * shutdown phase does not finish during this period, close() will
1452 * return but the graceful shutdown phase continues in the system.
1453 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02001454static void sctp_close(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001456 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 struct sctp_endpoint *ep;
1458 struct sctp_association *asoc;
1459 struct list_head *pos, *temp;
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001460 unsigned int data_was_unread;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461
Daniel Borkmannbb333812013-06-28 19:49:40 +02001462 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463
1464 sctp_lock_sock(sk);
1465 sk->sk_shutdown = SHUTDOWN_MASK;
Vlad Yasevichbec96402009-07-30 18:08:28 -04001466 sk->sk_state = SCTP_SS_CLOSING;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467
1468 ep = sctp_sk(sk)->ep;
1469
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001470 /* Clean up any skbs sitting on the receive queue. */
1471 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1472 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1473
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07001474 /* Walk all associations on an endpoint. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475 list_for_each_safe(pos, temp, &ep->asocs) {
1476 asoc = list_entry(pos, struct sctp_association, asocs);
1477
1478 if (sctp_style(sk, TCP)) {
1479 /* A closed association can still be in the list if
1480 * it belongs to a TCP-style listening socket that is
1481 * not yet accepted. If so, free it. If not, send an
1482 * ABORT or SHUTDOWN based on the linger options.
1483 */
1484 if (sctp_state(asoc, CLOSED)) {
1485 sctp_unhash_established(asoc);
1486 sctp_association_free(asoc);
Vladislav Yasevichb89498a2006-05-19 14:32:06 -07001487 continue;
1488 }
1489 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001491 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1492 !skb_queue_empty(&asoc->ulpq.reasm) ||
1493 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
Sridhar Samudralab9ac8672006-08-28 13:53:01 -07001494 struct sctp_chunk *chunk;
1495
1496 chunk = sctp_make_abort_user(asoc, NULL, 0);
1497 if (chunk)
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001498 sctp_primitive_ABORT(net, asoc, chunk);
Sridhar Samudralab9ac8672006-08-28 13:53:01 -07001499 } else
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001500 sctp_primitive_SHUTDOWN(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501 }
1502
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 /* On a TCP-style socket, block for at most linger_time if set. */
1504 if (sctp_style(sk, TCP) && timeout)
1505 sctp_wait_for_close(sk, timeout);
1506
1507 /* This will run the backlog queue. */
1508 sctp_release_sock(sk);
1509
1510 /* Supposedly, no process has access to the socket, but
1511 * the net layers still may.
1512 */
1513 sctp_local_bh_disable();
1514 sctp_bh_lock_sock(sk);
1515
1516 /* Hold the sock, since sk_common_release() will put sock_put()
1517 * and we have just a little more cleanup.
1518 */
1519 sock_hold(sk);
1520 sk_common_release(sk);
1521
1522 sctp_bh_unlock_sock(sk);
1523 sctp_local_bh_enable();
1524
1525 sock_put(sk);
1526
1527 SCTP_DBG_OBJCNT_DEC(sock);
1528}
1529
1530/* Handle EPIPE error. */
1531static int sctp_error(struct sock *sk, int flags, int err)
1532{
1533 if (err == -EPIPE)
1534 err = sock_error(sk) ? : -EPIPE;
1535 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1536 send_sig(SIGPIPE, current, 0);
1537 return err;
1538}
1539
1540/* API 3.1.3 sendmsg() - UDP Style Syntax
1541 *
1542 * An application uses sendmsg() and recvmsg() calls to transmit data to
1543 * and receive data from its peer.
1544 *
1545 * ssize_t sendmsg(int socket, const struct msghdr *message,
1546 * int flags);
1547 *
1548 * socket - the socket descriptor of the endpoint.
1549 * message - pointer to the msghdr structure which contains a single
1550 * user message and possibly some ancillary data.
1551 *
1552 * See Section 5 for complete description of the data
1553 * structures.
1554 *
1555 * flags - flags sent or received with the user message, see Section
1556 * 5 for complete description of the flags.
1557 *
1558 * Note: This function could use a rewrite especially when explicit
1559 * connect support comes in.
1560 */
1561/* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1562
Daniel Borkmanndda91922013-06-17 11:40:05 +02001563static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564
Daniel Borkmanndda91922013-06-17 11:40:05 +02001565static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1566 struct msghdr *msg, size_t msg_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001568 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 struct sctp_sock *sp;
1570 struct sctp_endpoint *ep;
1571 struct sctp_association *new_asoc=NULL, *asoc=NULL;
1572 struct sctp_transport *transport, *chunk_tp;
1573 struct sctp_chunk *chunk;
Al Virodce116a2006-11-20 17:25:15 -08001574 union sctp_addr to;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 struct sockaddr *msg_name = NULL;
Joe Perches517aa0b2011-05-12 11:27:20 +00001576 struct sctp_sndrcvinfo default_sinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 struct sctp_sndrcvinfo *sinfo;
1578 struct sctp_initmsg *sinit;
1579 sctp_assoc_t associd = 0;
1580 sctp_cmsgs_t cmsgs = { NULL };
1581 int err;
1582 sctp_scope_t scope;
1583 long timeo;
1584 __u16 sinfo_flags = 0;
1585 struct sctp_datamsg *datamsg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 int msg_flags = msg->msg_flags;
1587
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 err = 0;
1589 sp = sctp_sk(sk);
1590 ep = sp->ep;
1591
Daniel Borkmannbb333812013-06-28 19:49:40 +02001592 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
1593 msg, msg_len, ep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594
1595 /* We cannot send a message over a TCP-style listening socket. */
1596 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1597 err = -EPIPE;
1598 goto out_nounlock;
1599 }
1600
1601 /* Parse out the SCTP CMSGs. */
1602 err = sctp_msghdr_parse(msg, &cmsgs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 if (err) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02001604 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 goto out_nounlock;
1606 }
1607
1608 /* Fetch the destination address for this packet. This
1609 * address only selects the association--it is not necessarily
1610 * the address we will send to.
1611 * For a peeled-off socket, msg_name is ignored.
1612 */
1613 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1614 int msg_namelen = msg->msg_namelen;
1615
1616 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1617 msg_namelen);
1618 if (err)
1619 return err;
1620
1621 if (msg_namelen > sizeof(to))
1622 msg_namelen = sizeof(to);
1623 memcpy(&to, msg->msg_name, msg_namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 msg_name = msg->msg_name;
1625 }
1626
1627 sinfo = cmsgs.info;
1628 sinit = cmsgs.init;
1629
1630 /* Did the user specify SNDRCVINFO? */
1631 if (sinfo) {
1632 sinfo_flags = sinfo->sinfo_flags;
1633 associd = sinfo->sinfo_assoc_id;
1634 }
1635
Daniel Borkmannbb333812013-06-28 19:49:40 +02001636 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
1637 msg_len, sinfo_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001639 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1640 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 err = -EINVAL;
1642 goto out_nounlock;
1643 }
1644
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001645 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1646 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1647 * If SCTP_ABORT is set, the message length could be non zero with
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 * the msg_iov set to the user abort reason.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001649 */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001650 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1651 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652 err = -EINVAL;
1653 goto out_nounlock;
1654 }
1655
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001656 /* If SCTP_ADDR_OVER is set, there must be an address
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657 * specified in msg_name.
1658 */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001659 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 err = -EINVAL;
1661 goto out_nounlock;
1662 }
1663
1664 transport = NULL;
1665
Daniel Borkmannbb333812013-06-28 19:49:40 +02001666 pr_debug("%s: about to look up association\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667
1668 sctp_lock_sock(sk);
1669
1670 /* If a msg_name has been specified, assume this is to be used. */
1671 if (msg_name) {
1672 /* Look for a matching association on the endpoint. */
Al Virodce116a2006-11-20 17:25:15 -08001673 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 if (!asoc) {
1675 /* If we could not find a matching association on the
1676 * endpoint, make sure that it is not a TCP-style
1677 * socket that already has an association or there is
1678 * no peeled-off association on another socket.
1679 */
1680 if ((sctp_style(sk, TCP) &&
1681 sctp_sstate(sk, ESTABLISHED)) ||
Al Virodce116a2006-11-20 17:25:15 -08001682 sctp_endpoint_is_peeled_off(ep, &to)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683 err = -EADDRNOTAVAIL;
1684 goto out_unlock;
1685 }
1686 }
1687 } else {
1688 asoc = sctp_id2assoc(sk, associd);
1689 if (!asoc) {
1690 err = -EPIPE;
1691 goto out_unlock;
1692 }
1693 }
1694
1695 if (asoc) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02001696 pr_debug("%s: just looked up association:%p\n", __func__, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697
1698 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1699 * socket that has an association in CLOSED state. This can
1700 * happen when an accepted socket has an association that is
1701 * already CLOSED.
1702 */
1703 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1704 err = -EPIPE;
1705 goto out_unlock;
1706 }
1707
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001708 if (sinfo_flags & SCTP_EOF) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02001709 pr_debug("%s: shutting down association:%p\n",
1710 __func__, asoc);
1711
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001712 sctp_primitive_SHUTDOWN(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 err = 0;
1714 goto out_unlock;
1715 }
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001716 if (sinfo_flags & SCTP_ABORT) {
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001717
1718 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1719 if (!chunk) {
1720 err = -ENOMEM;
1721 goto out_unlock;
1722 }
1723
Daniel Borkmannbb333812013-06-28 19:49:40 +02001724 pr_debug("%s: aborting association:%p\n",
1725 __func__, asoc);
1726
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001727 sctp_primitive_ABORT(net, asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728 err = 0;
1729 goto out_unlock;
1730 }
1731 }
1732
1733 /* Do we need to create the association? */
1734 if (!asoc) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02001735 pr_debug("%s: there is no association yet\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001737 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738 err = -EINVAL;
1739 goto out_unlock;
1740 }
1741
1742 /* Check for invalid stream against the stream counts,
1743 * either the default or the user specified stream counts.
1744 */
1745 if (sinfo) {
1746 if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1747 /* Check against the defaults. */
1748 if (sinfo->sinfo_stream >=
1749 sp->initmsg.sinit_num_ostreams) {
1750 err = -EINVAL;
1751 goto out_unlock;
1752 }
1753 } else {
1754 /* Check against the requested. */
1755 if (sinfo->sinfo_stream >=
1756 sinit->sinit_num_ostreams) {
1757 err = -EINVAL;
1758 goto out_unlock;
1759 }
1760 }
1761 }
1762
1763 /*
1764 * API 3.1.2 bind() - UDP Style Syntax
1765 * If a bind() or sctp_bindx() is not called prior to a
1766 * sendmsg() call that initiates a new association, the
1767 * system picks an ephemeral port and will choose an address
1768 * set equivalent to binding with a wildcard address.
1769 */
1770 if (!ep->base.bind_addr.port) {
1771 if (sctp_autobind(sk)) {
1772 err = -EAGAIN;
1773 goto out_unlock;
1774 }
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001775 } else {
1776 /*
1777 * If an unprivileged user inherits a one-to-many
1778 * style socket with open associations on a privileged
1779 * port, it MAY be permitted to accept new associations,
1780 * but it SHOULD NOT be permitted to open new
1781 * associations.
1782 */
1783 if (ep->base.bind_addr.port < PROT_SOCK &&
Eric W. Biederman35946982012-11-16 03:03:12 +00001784 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001785 err = -EACCES;
1786 goto out_unlock;
1787 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 }
1789
1790 scope = sctp_scope(&to);
1791 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1792 if (!new_asoc) {
1793 err = -ENOMEM;
1794 goto out_unlock;
1795 }
1796 asoc = new_asoc;
Vlad Yasevich409b95a2009-11-10 08:57:34 +00001797 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1798 if (err < 0) {
1799 err = -ENOMEM;
1800 goto out_free;
1801 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802
1803 /* If the SCTP_INIT ancillary data is specified, set all
1804 * the association init values accordingly.
1805 */
1806 if (sinit) {
1807 if (sinit->sinit_num_ostreams) {
1808 asoc->c.sinit_num_ostreams =
1809 sinit->sinit_num_ostreams;
1810 }
1811 if (sinit->sinit_max_instreams) {
1812 asoc->c.sinit_max_instreams =
1813 sinit->sinit_max_instreams;
1814 }
1815 if (sinit->sinit_max_attempts) {
1816 asoc->max_init_attempts
1817 = sinit->sinit_max_attempts;
1818 }
1819 if (sinit->sinit_max_init_timeo) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001820 asoc->max_init_timeo =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1822 }
1823 }
1824
1825 /* Prime the peer's transport structures. */
Al Virodce116a2006-11-20 17:25:15 -08001826 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827 if (!transport) {
1828 err = -ENOMEM;
1829 goto out_free;
1830 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831 }
1832
1833 /* ASSERT: we have a valid association at this point. */
Daniel Borkmannbb333812013-06-28 19:49:40 +02001834 pr_debug("%s: we have a valid association\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835
1836 if (!sinfo) {
1837 /* If the user didn't specify SNDRCVINFO, make up one with
1838 * some defaults.
1839 */
Joe Perches517aa0b2011-05-12 11:27:20 +00001840 memset(&default_sinfo, 0, sizeof(default_sinfo));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841 default_sinfo.sinfo_stream = asoc->default_stream;
1842 default_sinfo.sinfo_flags = asoc->default_flags;
1843 default_sinfo.sinfo_ppid = asoc->default_ppid;
1844 default_sinfo.sinfo_context = asoc->default_context;
1845 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1846 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1847 sinfo = &default_sinfo;
1848 }
1849
1850 /* API 7.1.7, the sndbuf size per association bounds the
1851 * maximum size of data that can be sent in a single send call.
1852 */
1853 if (msg_len > sk->sk_sndbuf) {
1854 err = -EMSGSIZE;
1855 goto out_free;
1856 }
1857
Vlad Yasevich8a479492007-06-07 14:21:05 -04001858 if (asoc->pmtu_pending)
David S. Miller02f3d4c2012-07-16 03:57:14 -07001859 sctp_assoc_pending_pmtu(sk, asoc);
Vlad Yasevich8a479492007-06-07 14:21:05 -04001860
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861 /* If fragmentation is disabled and the message length exceeds the
1862 * association fragmentation point, return EMSGSIZE. The I-D
1863 * does not specify what this error is, but this looks like
1864 * a great fit.
1865 */
1866 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1867 err = -EMSGSIZE;
1868 goto out_free;
1869 }
1870
Joe Perchesafd76142011-05-12 09:19:10 +00001871 /* Check for invalid stream. */
1872 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1873 err = -EINVAL;
1874 goto out_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 }
1876
1877 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1878 if (!sctp_wspace(asoc)) {
1879 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1880 if (err)
1881 goto out_free;
1882 }
1883
1884 /* If an address is passed with the sendto/sendmsg call, it is used
1885 * to override the primary destination address in the TCP model, or
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001886 * when SCTP_ADDR_OVER flag is set in the UDP model.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 */
1888 if ((sctp_style(sk, TCP) && msg_name) ||
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001889 (sinfo_flags & SCTP_ADDR_OVER)) {
Al Virodce116a2006-11-20 17:25:15 -08001890 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891 if (!chunk_tp) {
1892 err = -EINVAL;
1893 goto out_free;
1894 }
1895 } else
1896 chunk_tp = NULL;
1897
1898 /* Auto-connect, if we aren't connected already. */
1899 if (sctp_state(asoc, CLOSED)) {
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001900 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 if (err < 0)
1902 goto out_free;
Daniel Borkmannbb333812013-06-28 19:49:40 +02001903
1904 pr_debug("%s: we associated primitively\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 }
1906
1907 /* Break the message into multiple chunks of maximum size. */
1908 datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
Tommi Rantala6e51fe72012-11-22 03:23:16 +00001909 if (IS_ERR(datamsg)) {
1910 err = PTR_ERR(datamsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 goto out_free;
1912 }
1913
1914 /* Now send the (possibly) fragmented message. */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07001915 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
Florian Westphal80445cf2008-03-23 22:47:08 -07001916 sctp_chunk_hold(chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917
1918 /* Do accounting for the write space. */
1919 sctp_set_owner_w(chunk);
1920
1921 chunk->transport = chunk_tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922 }
1923
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001924 /* Send it to the lower layers. Note: all chunks
1925 * must either fail or succeed. The lower layer
1926 * works that way today. Keep it that way or this
1927 * breaks.
1928 */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001929 err = sctp_primitive_SEND(net, asoc, datamsg);
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001930 /* Did the lower layer accept the chunk? */
Daniel Borkmannbb333812013-06-28 19:49:40 +02001931 if (err) {
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001932 sctp_datamsg_free(datamsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933 goto out_free;
Daniel Borkmannbb333812013-06-28 19:49:40 +02001934 }
1935
1936 pr_debug("%s: we sent primitively\n", __func__);
1937
1938 sctp_datamsg_put(datamsg);
1939 err = msg_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940
1941 /* If we are already past ASSOCIATE, the lower
1942 * layers are responsible for association cleanup.
1943 */
1944 goto out_unlock;
1945
1946out_free:
Neil Horman2eebc1e2012-07-16 09:13:51 +00001947 if (new_asoc) {
1948 sctp_unhash_established(asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 sctp_association_free(asoc);
Neil Horman2eebc1e2012-07-16 09:13:51 +00001950 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951out_unlock:
1952 sctp_release_sock(sk);
1953
1954out_nounlock:
1955 return sctp_error(sk, msg_flags, err);
1956
1957#if 0
1958do_sock_err:
1959 if (msg_len)
1960 err = msg_len;
1961 else
1962 err = sock_error(sk);
1963 goto out;
1964
1965do_interrupted:
1966 if (msg_len)
1967 err = msg_len;
1968 goto out;
1969#endif /* 0 */
1970}
1971
1972/* This is an extended version of skb_pull() that removes the data from the
1973 * start of a skb even when data is spread across the list of skb's in the
1974 * frag_list. len specifies the total amount of data that needs to be removed.
1975 * when 'len' bytes could be removed from the skb, it returns 0.
1976 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1977 * could not be removed.
1978 */
1979static int sctp_skb_pull(struct sk_buff *skb, int len)
1980{
1981 struct sk_buff *list;
1982 int skb_len = skb_headlen(skb);
1983 int rlen;
1984
1985 if (len <= skb_len) {
1986 __skb_pull(skb, len);
1987 return 0;
1988 }
1989 len -= skb_len;
1990 __skb_pull(skb, skb_len);
1991
David S. Miller1b003be2009-06-09 00:22:35 -07001992 skb_walk_frags(skb, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993 rlen = sctp_skb_pull(list, len);
1994 skb->len -= (len-rlen);
1995 skb->data_len -= (len-rlen);
1996
1997 if (!rlen)
1998 return 0;
1999
2000 len = rlen;
2001 }
2002
2003 return len;
2004}
2005
2006/* API 3.1.3 recvmsg() - UDP Style Syntax
2007 *
2008 * ssize_t recvmsg(int socket, struct msghdr *message,
2009 * int flags);
2010 *
2011 * socket - the socket descriptor of the endpoint.
2012 * message - pointer to the msghdr structure which contains a single
2013 * user message and possibly some ancillary data.
2014 *
2015 * See Section 5 for complete description of the data
2016 * structures.
2017 *
2018 * flags - flags sent or received with the user message, see Section
2019 * 5 for complete description of the flags.
2020 */
2021static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
2022
Daniel Borkmanndda91922013-06-17 11:40:05 +02002023static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
2024 struct msghdr *msg, size_t len, int noblock,
2025 int flags, int *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026{
2027 struct sctp_ulpevent *event = NULL;
2028 struct sctp_sock *sp = sctp_sk(sk);
2029 struct sk_buff *skb;
2030 int copied;
2031 int err = 0;
2032 int skb_len;
2033
Daniel Borkmannbb333812013-06-28 19:49:40 +02002034 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2035 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2036 addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037
2038 sctp_lock_sock(sk);
2039
2040 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2041 err = -ENOTCONN;
2042 goto out;
2043 }
2044
2045 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2046 if (!skb)
2047 goto out;
2048
2049 /* Get the total length of the skb including any skb's in the
2050 * frag_list.
2051 */
2052 skb_len = skb->len;
2053
2054 copied = skb_len;
2055 if (copied > len)
2056 copied = len;
2057
2058 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2059
2060 event = sctp_skb2event(skb);
2061
2062 if (err)
2063 goto out_free;
2064
Neil Horman3b885782009-10-12 13:26:31 -07002065 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066 if (sctp_ulpevent_is_notification(event)) {
2067 msg->msg_flags |= MSG_NOTIFICATION;
2068 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2069 } else {
2070 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2071 }
2072
2073 /* Check if we allow SCTP_SNDRCVINFO. */
2074 if (sp->subscribe.sctp_data_io_event)
2075 sctp_ulpevent_read_sndrcvinfo(event, msg);
2076#if 0
2077 /* FIXME: we should be calling IP/IPv6 layers. */
2078 if (sk->sk_protinfo.af_inet.cmsg_flags)
2079 ip_cmsg_recv(msg, skb);
2080#endif
2081
2082 err = copied;
2083
2084 /* If skb's length exceeds the user's buffer, update the skb and
2085 * push it back to the receive_queue so that the next call to
2086 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2087 */
2088 if (skb_len > copied) {
2089 msg->msg_flags &= ~MSG_EOR;
2090 if (flags & MSG_PEEK)
2091 goto out_free;
2092 sctp_skb_pull(skb, copied);
2093 skb_queue_head(&sk->sk_receive_queue, skb);
2094
2095 /* When only partial message is copied to the user, increase
2096 * rwnd by that amount. If all the data in the skb is read,
2097 * rwnd is updated when the event is freed.
2098 */
Vlad Yasevich0eca8fe2008-01-11 10:12:56 -05002099 if (!sctp_ulpevent_is_notification(event))
2100 sctp_assoc_rwnd_increase(event->asoc, copied);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101 goto out;
2102 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2103 (event->msg_flags & MSG_EOR))
2104 msg->msg_flags |= MSG_EOR;
2105 else
2106 msg->msg_flags &= ~MSG_EOR;
2107
2108out_free:
2109 if (flags & MSG_PEEK) {
2110 /* Release the skb reference acquired after peeking the skb in
2111 * sctp_skb_recv_datagram().
2112 */
2113 kfree_skb(skb);
2114 } else {
2115 /* Free the event which includes releasing the reference to
2116 * the owner of the skb, freeing the skb and updating the
2117 * rwnd.
2118 */
2119 sctp_ulpevent_free(event);
2120 }
2121out:
2122 sctp_release_sock(sk);
2123 return err;
2124}
2125
2126/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2127 *
2128 * This option is a on/off flag. If enabled no SCTP message
2129 * fragmentation will be performed. Instead if a message being sent
2130 * exceeds the current PMTU size, the message will NOT be sent and
2131 * instead a error will be indicated to the user.
2132 */
2133static int sctp_setsockopt_disable_fragments(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002134 char __user *optval,
2135 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002136{
2137 int val;
2138
2139 if (optlen < sizeof(int))
2140 return -EINVAL;
2141
2142 if (get_user(val, (int __user *)optval))
2143 return -EFAULT;
2144
2145 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2146
2147 return 0;
2148}
2149
2150static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002151 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002152{
Wei Yongjun94912302011-07-02 09:28:04 +00002153 struct sctp_association *asoc;
2154 struct sctp_ulpevent *event;
2155
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05002156 if (optlen > sizeof(struct sctp_event_subscribe))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157 return -EINVAL;
2158 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2159 return -EFAULT;
Wei Yongjun94912302011-07-02 09:28:04 +00002160
2161 /*
2162 * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2163 * if there is no data to be sent or retransmit, the stack will
2164 * immediately send up this notification.
2165 */
2166 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2167 &sctp_sk(sk)->subscribe)) {
2168 asoc = sctp_id2assoc(sk, 0);
2169
2170 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2171 event = sctp_ulpevent_make_sender_dry_event(asoc,
2172 GFP_ATOMIC);
2173 if (!event)
2174 return -ENOMEM;
2175
2176 sctp_ulpq_tail_event(&asoc->ulpq, event);
2177 }
2178 }
2179
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180 return 0;
2181}
2182
2183/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2184 *
2185 * This socket option is applicable to the UDP-style socket only. When
2186 * set it will cause associations that are idle for more than the
2187 * specified number of seconds to automatically close. An association
2188 * being idle is defined an association that has NOT sent or received
2189 * user data. The special value of '0' indicates that no automatic
2190 * close of any associations should be performed. The option expects an
2191 * integer defining the number of seconds of idle time before an
2192 * association is closed.
2193 */
2194static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002195 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196{
2197 struct sctp_sock *sp = sctp_sk(sk);
2198
2199 /* Applicable to UDP-style socket only */
2200 if (sctp_style(sk, TCP))
2201 return -EOPNOTSUPP;
2202 if (optlen != sizeof(int))
2203 return -EINVAL;
2204 if (copy_from_user(&sp->autoclose, optval, optlen))
2205 return -EFAULT;
2206
Linus Torvalds1da177e2005-04-16 15:20:36 -07002207 return 0;
2208}
2209
2210/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2211 *
2212 * Applications can enable or disable heartbeats for any peer address of
2213 * an association, modify an address's heartbeat interval, force a
2214 * heartbeat to be sent immediately, and adjust the address's maximum
2215 * number of retransmissions sent before an address is considered
2216 * unreachable. The following structure is used to access and modify an
2217 * address's parameters:
2218 *
2219 * struct sctp_paddrparams {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002220 * sctp_assoc_t spp_assoc_id;
2221 * struct sockaddr_storage spp_address;
2222 * uint32_t spp_hbinterval;
2223 * uint16_t spp_pathmaxrxt;
2224 * uint32_t spp_pathmtu;
2225 * uint32_t spp_sackdelay;
2226 * uint32_t spp_flags;
2227 * };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08002229 * spp_assoc_id - (one-to-many style socket) This is filled in the
2230 * application, and identifies the association for
2231 * this query.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002232 * spp_address - This specifies which address is of interest.
2233 * spp_hbinterval - This contains the value of the heartbeat interval,
Frank Filz52ccb8e2005-12-22 11:36:46 -08002234 * in milliseconds. If a value of zero
2235 * is present in this field then no changes are to
2236 * be made to this parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237 * spp_pathmaxrxt - This contains the maximum number of
2238 * retransmissions before this address shall be
Frank Filz52ccb8e2005-12-22 11:36:46 -08002239 * considered unreachable. If a value of zero
2240 * is present in this field then no changes are to
2241 * be made to this parameter.
2242 * spp_pathmtu - When Path MTU discovery is disabled the value
2243 * specified here will be the "fixed" path mtu.
2244 * Note that if the spp_address field is empty
2245 * then all associations on this address will
2246 * have this fixed path mtu set upon them.
2247 *
2248 * spp_sackdelay - When delayed sack is enabled, this value specifies
2249 * the number of milliseconds that sacks will be delayed
2250 * for. This value will apply to all addresses of an
2251 * association if the spp_address field is empty. Note
2252 * also, that if delayed sack is enabled and this
2253 * value is set to 0, no change is made to the last
2254 * recorded delayed sack timer value.
2255 *
2256 * spp_flags - These flags are used to control various features
2257 * on an association. The flag field may contain
2258 * zero or more of the following options.
2259 *
2260 * SPP_HB_ENABLE - Enable heartbeats on the
2261 * specified address. Note that if the address
2262 * field is empty all addresses for the association
2263 * have heartbeats enabled upon them.
2264 *
2265 * SPP_HB_DISABLE - Disable heartbeats on the
2266 * speicifed address. Note that if the address
2267 * field is empty all addresses for the association
2268 * will have their heartbeats disabled. Note also
2269 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2270 * mutually exclusive, only one of these two should
2271 * be specified. Enabling both fields will have
2272 * undetermined results.
2273 *
2274 * SPP_HB_DEMAND - Request a user initiated heartbeat
2275 * to be made immediately.
2276 *
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002277 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2278 * heartbeat delayis to be set to the value of 0
2279 * milliseconds.
2280 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08002281 * SPP_PMTUD_ENABLE - This field will enable PMTU
2282 * discovery upon the specified address. Note that
2283 * if the address feild is empty then all addresses
2284 * on the association are effected.
2285 *
2286 * SPP_PMTUD_DISABLE - This field will disable PMTU
2287 * discovery upon the specified address. Note that
2288 * if the address feild is empty then all addresses
2289 * on the association are effected. Not also that
2290 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2291 * exclusive. Enabling both will have undetermined
2292 * results.
2293 *
2294 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2295 * on delayed sack. The time specified in spp_sackdelay
2296 * is used to specify the sack delay for this address. Note
2297 * that if spp_address is empty then all addresses will
2298 * enable delayed sack and take on the sack delay
2299 * value specified in spp_sackdelay.
2300 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2301 * off delayed sack. If the spp_address field is blank then
2302 * delayed sack is disabled for the entire association. Note
2303 * also that this field is mutually exclusive to
2304 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2305 * results.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002306 */
Adrian Bunk16164362006-09-18 00:40:38 -07002307static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2308 struct sctp_transport *trans,
2309 struct sctp_association *asoc,
2310 struct sctp_sock *sp,
2311 int hb_change,
2312 int pmtud_change,
2313 int sackdelay_change)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002314{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002315 int error;
2316
Frank Filz52ccb8e2005-12-22 11:36:46 -08002317 if (params->spp_flags & SPP_HB_DEMAND && trans) {
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00002318 struct net *net = sock_net(trans->asoc->base.sk);
2319
2320 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002321 if (error)
2322 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002323 }
2324
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002325 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2326 * this field is ignored. Note also that a value of zero indicates
2327 * the current setting should be left unchanged.
2328 */
2329 if (params->spp_flags & SPP_HB_ENABLE) {
2330
2331 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2332 * set. This lets us use 0 value when this flag
2333 * is set.
2334 */
2335 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2336 params->spp_hbinterval = 0;
2337
2338 if (params->spp_hbinterval ||
2339 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2340 if (trans) {
2341 trans->hbinterval =
2342 msecs_to_jiffies(params->spp_hbinterval);
2343 } else if (asoc) {
2344 asoc->hbinterval =
2345 msecs_to_jiffies(params->spp_hbinterval);
2346 } else {
2347 sp->hbinterval = params->spp_hbinterval;
2348 }
Frank Filz52ccb8e2005-12-22 11:36:46 -08002349 }
2350 }
2351
2352 if (hb_change) {
2353 if (trans) {
2354 trans->param_flags =
2355 (trans->param_flags & ~SPP_HB) | hb_change;
2356 } else if (asoc) {
2357 asoc->param_flags =
2358 (asoc->param_flags & ~SPP_HB) | hb_change;
2359 } else {
2360 sp->param_flags =
2361 (sp->param_flags & ~SPP_HB) | hb_change;
2362 }
2363 }
2364
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002365 /* When Path MTU discovery is disabled the value specified here will
2366 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2367 * include the flag SPP_PMTUD_DISABLE for this field to have any
2368 * effect).
2369 */
2370 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002371 if (trans) {
2372 trans->pathmtu = params->spp_pathmtu;
David S. Miller02f3d4c2012-07-16 03:57:14 -07002373 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
Frank Filz52ccb8e2005-12-22 11:36:46 -08002374 } else if (asoc) {
2375 asoc->pathmtu = params->spp_pathmtu;
Vlad Yasevichf68b2e02009-09-04 18:21:00 -04002376 sctp_frag_point(asoc, params->spp_pathmtu);
Frank Filz52ccb8e2005-12-22 11:36:46 -08002377 } else {
2378 sp->pathmtu = params->spp_pathmtu;
2379 }
2380 }
2381
2382 if (pmtud_change) {
2383 if (trans) {
2384 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2385 (params->spp_flags & SPP_PMTUD_ENABLE);
2386 trans->param_flags =
2387 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2388 if (update) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +00002389 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
David S. Miller02f3d4c2012-07-16 03:57:14 -07002390 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
Frank Filz52ccb8e2005-12-22 11:36:46 -08002391 }
2392 } else if (asoc) {
2393 asoc->param_flags =
2394 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2395 } else {
2396 sp->param_flags =
2397 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2398 }
2399 }
2400
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002401 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2402 * value of this field is ignored. Note also that a value of zero
2403 * indicates the current setting should be left unchanged.
2404 */
2405 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002406 if (trans) {
2407 trans->sackdelay =
2408 msecs_to_jiffies(params->spp_sackdelay);
2409 } else if (asoc) {
2410 asoc->sackdelay =
2411 msecs_to_jiffies(params->spp_sackdelay);
2412 } else {
2413 sp->sackdelay = params->spp_sackdelay;
2414 }
2415 }
2416
2417 if (sackdelay_change) {
2418 if (trans) {
2419 trans->param_flags =
2420 (trans->param_flags & ~SPP_SACKDELAY) |
2421 sackdelay_change;
2422 } else if (asoc) {
2423 asoc->param_flags =
2424 (asoc->param_flags & ~SPP_SACKDELAY) |
2425 sackdelay_change;
2426 } else {
2427 sp->param_flags =
2428 (sp->param_flags & ~SPP_SACKDELAY) |
2429 sackdelay_change;
2430 }
2431 }
2432
Andrei Pelinescu-Onciul37051f72009-11-23 15:53:57 -05002433 /* Note that a value of zero indicates the current setting should be
2434 left unchanged.
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002435 */
Andrei Pelinescu-Onciul37051f72009-11-23 15:53:57 -05002436 if (params->spp_pathmaxrxt) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002437 if (trans) {
2438 trans->pathmaxrxt = params->spp_pathmaxrxt;
2439 } else if (asoc) {
2440 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2441 } else {
2442 sp->pathmaxrxt = params->spp_pathmaxrxt;
2443 }
2444 }
2445
2446 return 0;
2447}
2448
2449static int sctp_setsockopt_peer_addr_params(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002450 char __user *optval,
2451 unsigned int optlen)
Frank Filz52ccb8e2005-12-22 11:36:46 -08002452{
2453 struct sctp_paddrparams params;
2454 struct sctp_transport *trans = NULL;
2455 struct sctp_association *asoc = NULL;
2456 struct sctp_sock *sp = sctp_sk(sk);
2457 int error;
2458 int hb_change, pmtud_change, sackdelay_change;
2459
2460 if (optlen != sizeof(struct sctp_paddrparams))
2461 return - EINVAL;
2462
2463 if (copy_from_user(&params, optval, optlen))
2464 return -EFAULT;
2465
2466 /* Validate flags and value parameters. */
2467 hb_change = params.spp_flags & SPP_HB;
2468 pmtud_change = params.spp_flags & SPP_PMTUD;
2469 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2470
2471 if (hb_change == SPP_HB ||
2472 pmtud_change == SPP_PMTUD ||
2473 sackdelay_change == SPP_SACKDELAY ||
2474 params.spp_sackdelay > 500 ||
Joe Perchesf64f9e72009-11-29 16:55:45 -08002475 (params.spp_pathmtu &&
2476 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
Frank Filz52ccb8e2005-12-22 11:36:46 -08002477 return -EINVAL;
2478
2479 /* If an address other than INADDR_ANY is specified, and
2480 * no transport is found, then the request is invalid.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002481 */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -04002482 if (!sctp_is_any(sk, ( union sctp_addr *)&params.spp_address)) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002483 trans = sctp_addr_id2transport(sk, &params.spp_address,
2484 params.spp_assoc_id);
2485 if (!trans)
2486 return -EINVAL;
2487 }
2488
2489 /* Get association, if assoc_id != 0 and the socket is a one
2490 * to many style socket, and an association was not found, then
2491 * the id was invalid.
2492 */
2493 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2494 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2495 return -EINVAL;
2496
2497 /* Heartbeat demand can only be sent on a transport or
2498 * association, but not a socket.
2499 */
2500 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2501 return -EINVAL;
2502
2503 /* Process parameters. */
2504 error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2505 hb_change, pmtud_change,
2506 sackdelay_change);
2507
2508 if (error)
2509 return error;
2510
2511 /* If changes are for association, also apply parameters to each
2512 * transport.
2513 */
2514 if (!trans && asoc) {
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002515 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2516 transports) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002517 sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2518 hb_change, pmtud_change,
2519 sackdelay_change);
2520 }
2521 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002522
2523 return 0;
2524}
2525
Wei Yongjund364d922008-05-09 15:13:26 -07002526/*
2527 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
Frank Filz77086102005-12-22 11:37:30 -08002528 *
Wei Yongjund364d922008-05-09 15:13:26 -07002529 * This option will effect the way delayed acks are performed. This
2530 * option allows you to get or set the delayed ack time, in
2531 * milliseconds. It also allows changing the delayed ack frequency.
2532 * Changing the frequency to 1 disables the delayed sack algorithm. If
2533 * the assoc_id is 0, then this sets or gets the endpoints default
2534 * values. If the assoc_id field is non-zero, then the set or get
2535 * effects the specified association for the one to many model (the
2536 * assoc_id field is ignored by the one to one model). Note that if
2537 * sack_delay or sack_freq are 0 when setting this option, then the
2538 * current values will remain unchanged.
Frank Filz77086102005-12-22 11:37:30 -08002539 *
Wei Yongjund364d922008-05-09 15:13:26 -07002540 * struct sctp_sack_info {
2541 * sctp_assoc_t sack_assoc_id;
2542 * uint32_t sack_delay;
2543 * uint32_t sack_freq;
2544 * };
Frank Filz77086102005-12-22 11:37:30 -08002545 *
Wei Yongjund364d922008-05-09 15:13:26 -07002546 * sack_assoc_id - This parameter, indicates which association the user
2547 * is performing an action upon. Note that if this field's value is
2548 * zero then the endpoints default value is changed (effecting future
2549 * associations only).
Frank Filz77086102005-12-22 11:37:30 -08002550 *
Wei Yongjund364d922008-05-09 15:13:26 -07002551 * sack_delay - This parameter contains the number of milliseconds that
2552 * the user is requesting the delayed ACK timer be set to. Note that
2553 * this value is defined in the standard to be between 200 and 500
2554 * milliseconds.
Frank Filz77086102005-12-22 11:37:30 -08002555 *
Wei Yongjund364d922008-05-09 15:13:26 -07002556 * sack_freq - This parameter contains the number of packets that must
2557 * be received before a sack is sent without waiting for the delay
2558 * timer to expire. The default value for this is 2, setting this
2559 * value to 1 will disable the delayed sack algorithm.
Frank Filz77086102005-12-22 11:37:30 -08002560 */
2561
Wei Yongjund364d922008-05-09 15:13:26 -07002562static int sctp_setsockopt_delayed_ack(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002563 char __user *optval, unsigned int optlen)
Frank Filz77086102005-12-22 11:37:30 -08002564{
Wei Yongjund364d922008-05-09 15:13:26 -07002565 struct sctp_sack_info params;
Frank Filz77086102005-12-22 11:37:30 -08002566 struct sctp_transport *trans = NULL;
2567 struct sctp_association *asoc = NULL;
2568 struct sctp_sock *sp = sctp_sk(sk);
2569
Wei Yongjund364d922008-05-09 15:13:26 -07002570 if (optlen == sizeof(struct sctp_sack_info)) {
2571 if (copy_from_user(&params, optval, optlen))
2572 return -EFAULT;
2573
2574 if (params.sack_delay == 0 && params.sack_freq == 0)
2575 return 0;
2576 } else if (optlen == sizeof(struct sctp_assoc_value)) {
Joe Perches145ce502010-08-24 13:21:08 +00002577 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2578 pr_warn("Use struct sctp_sack_info instead\n");
Wei Yongjund364d922008-05-09 15:13:26 -07002579 if (copy_from_user(&params, optval, optlen))
2580 return -EFAULT;
2581
2582 if (params.sack_delay == 0)
2583 params.sack_freq = 1;
2584 else
2585 params.sack_freq = 0;
2586 } else
Frank Filz77086102005-12-22 11:37:30 -08002587 return - EINVAL;
2588
Frank Filz77086102005-12-22 11:37:30 -08002589 /* Validate value parameter. */
Wei Yongjund364d922008-05-09 15:13:26 -07002590 if (params.sack_delay > 500)
Frank Filz77086102005-12-22 11:37:30 -08002591 return -EINVAL;
2592
Wei Yongjund364d922008-05-09 15:13:26 -07002593 /* Get association, if sack_assoc_id != 0 and the socket is a one
Frank Filz77086102005-12-22 11:37:30 -08002594 * to many style socket, and an association was not found, then
2595 * the id was invalid.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002596 */
Wei Yongjund364d922008-05-09 15:13:26 -07002597 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2598 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
Frank Filz77086102005-12-22 11:37:30 -08002599 return -EINVAL;
2600
Wei Yongjund364d922008-05-09 15:13:26 -07002601 if (params.sack_delay) {
Frank Filz77086102005-12-22 11:37:30 -08002602 if (asoc) {
2603 asoc->sackdelay =
Wei Yongjund364d922008-05-09 15:13:26 -07002604 msecs_to_jiffies(params.sack_delay);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002605 asoc->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002606 (asoc->param_flags & ~SPP_SACKDELAY) |
2607 SPP_SACKDELAY_ENABLE;
2608 } else {
Wei Yongjund364d922008-05-09 15:13:26 -07002609 sp->sackdelay = params.sack_delay;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002610 sp->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002611 (sp->param_flags & ~SPP_SACKDELAY) |
2612 SPP_SACKDELAY_ENABLE;
2613 }
Wei Yongjund364d922008-05-09 15:13:26 -07002614 }
2615
2616 if (params.sack_freq == 1) {
Frank Filz77086102005-12-22 11:37:30 -08002617 if (asoc) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002618 asoc->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002619 (asoc->param_flags & ~SPP_SACKDELAY) |
2620 SPP_SACKDELAY_DISABLE;
2621 } else {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002622 sp->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002623 (sp->param_flags & ~SPP_SACKDELAY) |
2624 SPP_SACKDELAY_DISABLE;
2625 }
Wei Yongjund364d922008-05-09 15:13:26 -07002626 } else if (params.sack_freq > 1) {
2627 if (asoc) {
2628 asoc->sackfreq = params.sack_freq;
2629 asoc->param_flags =
2630 (asoc->param_flags & ~SPP_SACKDELAY) |
2631 SPP_SACKDELAY_ENABLE;
2632 } else {
2633 sp->sackfreq = params.sack_freq;
2634 sp->param_flags =
2635 (sp->param_flags & ~SPP_SACKDELAY) |
2636 SPP_SACKDELAY_ENABLE;
2637 }
Frank Filz77086102005-12-22 11:37:30 -08002638 }
2639
2640 /* If change is for association, also apply to each transport. */
2641 if (asoc) {
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002642 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2643 transports) {
Wei Yongjund364d922008-05-09 15:13:26 -07002644 if (params.sack_delay) {
Frank Filz77086102005-12-22 11:37:30 -08002645 trans->sackdelay =
Wei Yongjund364d922008-05-09 15:13:26 -07002646 msecs_to_jiffies(params.sack_delay);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002647 trans->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002648 (trans->param_flags & ~SPP_SACKDELAY) |
2649 SPP_SACKDELAY_ENABLE;
Wei Yongjund364d922008-05-09 15:13:26 -07002650 }
Vlad Yasevich7bfe8bd2008-06-09 15:45:05 -07002651 if (params.sack_freq == 1) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002652 trans->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002653 (trans->param_flags & ~SPP_SACKDELAY) |
2654 SPP_SACKDELAY_DISABLE;
Wei Yongjund364d922008-05-09 15:13:26 -07002655 } else if (params.sack_freq > 1) {
2656 trans->sackfreq = params.sack_freq;
2657 trans->param_flags =
2658 (trans->param_flags & ~SPP_SACKDELAY) |
2659 SPP_SACKDELAY_ENABLE;
Frank Filz77086102005-12-22 11:37:30 -08002660 }
2661 }
2662 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002663
Frank Filz77086102005-12-22 11:37:30 -08002664 return 0;
2665}
2666
Linus Torvalds1da177e2005-04-16 15:20:36 -07002667/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2668 *
2669 * Applications can specify protocol parameters for the default association
2670 * initialization. The option name argument to setsockopt() and getsockopt()
2671 * is SCTP_INITMSG.
2672 *
2673 * Setting initialization parameters is effective only on an unconnected
2674 * socket (for UDP-style sockets only future associations are effected
2675 * by the change). With TCP-style sockets, this option is inherited by
2676 * sockets derived from a listener socket.
2677 */
David S. Millerb7058842009-09-30 16:12:20 -07002678static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002679{
2680 struct sctp_initmsg sinit;
2681 struct sctp_sock *sp = sctp_sk(sk);
2682
2683 if (optlen != sizeof(struct sctp_initmsg))
2684 return -EINVAL;
2685 if (copy_from_user(&sinit, optval, optlen))
2686 return -EFAULT;
2687
2688 if (sinit.sinit_num_ostreams)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002689 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002690 if (sinit.sinit_max_instreams)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002691 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002692 if (sinit.sinit_max_attempts)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002693 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002694 if (sinit.sinit_max_init_timeo)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002695 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002696
2697 return 0;
2698}
2699
2700/*
2701 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2702 *
2703 * Applications that wish to use the sendto() system call may wish to
2704 * specify a default set of parameters that would normally be supplied
2705 * through the inclusion of ancillary data. This socket option allows
2706 * such an application to set the default sctp_sndrcvinfo structure.
2707 * The application that wishes to use this socket option simply passes
2708 * in to this call the sctp_sndrcvinfo structure defined in Section
2709 * 5.2.2) The input parameters accepted by this call include
2710 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2711 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2712 * to this call if the caller is using the UDP model.
2713 */
2714static int sctp_setsockopt_default_send_param(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002715 char __user *optval,
2716 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002717{
2718 struct sctp_sndrcvinfo info;
2719 struct sctp_association *asoc;
2720 struct sctp_sock *sp = sctp_sk(sk);
2721
2722 if (optlen != sizeof(struct sctp_sndrcvinfo))
2723 return -EINVAL;
2724 if (copy_from_user(&info, optval, optlen))
2725 return -EFAULT;
2726
2727 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2728 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2729 return -EINVAL;
2730
2731 if (asoc) {
2732 asoc->default_stream = info.sinfo_stream;
2733 asoc->default_flags = info.sinfo_flags;
2734 asoc->default_ppid = info.sinfo_ppid;
2735 asoc->default_context = info.sinfo_context;
2736 asoc->default_timetolive = info.sinfo_timetolive;
2737 } else {
2738 sp->default_stream = info.sinfo_stream;
2739 sp->default_flags = info.sinfo_flags;
2740 sp->default_ppid = info.sinfo_ppid;
2741 sp->default_context = info.sinfo_context;
2742 sp->default_timetolive = info.sinfo_timetolive;
2743 }
2744
2745 return 0;
2746}
2747
2748/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2749 *
2750 * Requests that the local SCTP stack use the enclosed peer address as
2751 * the association primary. The enclosed address must be one of the
2752 * association peer's addresses.
2753 */
2754static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002755 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002756{
2757 struct sctp_prim prim;
2758 struct sctp_transport *trans;
2759
2760 if (optlen != sizeof(struct sctp_prim))
2761 return -EINVAL;
2762
2763 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2764 return -EFAULT;
2765
2766 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2767 if (!trans)
2768 return -EINVAL;
2769
2770 sctp_assoc_set_primary(trans->asoc, trans);
2771
2772 return 0;
2773}
2774
2775/*
2776 * 7.1.5 SCTP_NODELAY
2777 *
2778 * Turn on/off any Nagle-like algorithm. This means that packets are
2779 * generally sent as soon as possible and no unnecessary delays are
2780 * introduced, at the cost of more packets in the network. Expects an
2781 * integer boolean flag.
2782 */
2783static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002784 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002785{
2786 int val;
2787
2788 if (optlen < sizeof(int))
2789 return -EINVAL;
2790 if (get_user(val, (int __user *)optval))
2791 return -EFAULT;
2792
2793 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2794 return 0;
2795}
2796
2797/*
2798 *
2799 * 7.1.1 SCTP_RTOINFO
2800 *
2801 * The protocol parameters used to initialize and bound retransmission
2802 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2803 * and modify these parameters.
2804 * All parameters are time values, in milliseconds. A value of 0, when
2805 * modifying the parameters, indicates that the current value should not
2806 * be changed.
2807 *
2808 */
David S. Millerb7058842009-09-30 16:12:20 -07002809static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2810{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002811 struct sctp_rtoinfo rtoinfo;
2812 struct sctp_association *asoc;
2813
2814 if (optlen != sizeof (struct sctp_rtoinfo))
2815 return -EINVAL;
2816
2817 if (copy_from_user(&rtoinfo, optval, optlen))
2818 return -EFAULT;
2819
2820 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2821
2822 /* Set the values to the specific association */
2823 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2824 return -EINVAL;
2825
2826 if (asoc) {
2827 if (rtoinfo.srto_initial != 0)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002828 asoc->rto_initial =
Linus Torvalds1da177e2005-04-16 15:20:36 -07002829 msecs_to_jiffies(rtoinfo.srto_initial);
2830 if (rtoinfo.srto_max != 0)
2831 asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2832 if (rtoinfo.srto_min != 0)
2833 asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2834 } else {
2835 /* If there is no association or the association-id = 0
2836 * set the values to the endpoint.
2837 */
2838 struct sctp_sock *sp = sctp_sk(sk);
2839
2840 if (rtoinfo.srto_initial != 0)
2841 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2842 if (rtoinfo.srto_max != 0)
2843 sp->rtoinfo.srto_max = rtoinfo.srto_max;
2844 if (rtoinfo.srto_min != 0)
2845 sp->rtoinfo.srto_min = rtoinfo.srto_min;
2846 }
2847
2848 return 0;
2849}
2850
2851/*
2852 *
2853 * 7.1.2 SCTP_ASSOCINFO
2854 *
Michael Opdenacker59c51592007-05-09 08:57:56 +02002855 * This option is used to tune the maximum retransmission attempts
Linus Torvalds1da177e2005-04-16 15:20:36 -07002856 * of the association.
2857 * Returns an error if the new association retransmission value is
2858 * greater than the sum of the retransmission value of the peer.
2859 * See [SCTP] for more information.
2860 *
2861 */
David S. Millerb7058842009-09-30 16:12:20 -07002862static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002863{
2864
2865 struct sctp_assocparams assocparams;
2866 struct sctp_association *asoc;
2867
2868 if (optlen != sizeof(struct sctp_assocparams))
2869 return -EINVAL;
2870 if (copy_from_user(&assocparams, optval, optlen))
2871 return -EFAULT;
2872
2873 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2874
2875 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2876 return -EINVAL;
2877
2878 /* Set the values to the specific association */
2879 if (asoc) {
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002880 if (assocparams.sasoc_asocmaxrxt != 0) {
2881 __u32 path_sum = 0;
2882 int paths = 0;
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002883 struct sctp_transport *peer_addr;
2884
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002885 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2886 transports) {
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002887 path_sum += peer_addr->pathmaxrxt;
2888 paths++;
2889 }
2890
Frederik Schwarzer025dfda2008-10-16 19:02:37 +02002891 /* Only validate asocmaxrxt if we have more than
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002892 * one path/transport. We do this because path
2893 * retransmissions are only counted when we have more
2894 * then one path.
2895 */
2896 if (paths > 1 &&
2897 assocparams.sasoc_asocmaxrxt > path_sum)
2898 return -EINVAL;
2899
Linus Torvalds1da177e2005-04-16 15:20:36 -07002900 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002901 }
2902
Daniel Borkmann52db8822013-06-25 18:17:27 +02002903 if (assocparams.sasoc_cookie_life != 0)
2904 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002905 } else {
2906 /* Set the values to the endpoint */
2907 struct sctp_sock *sp = sctp_sk(sk);
2908
2909 if (assocparams.sasoc_asocmaxrxt != 0)
2910 sp->assocparams.sasoc_asocmaxrxt =
2911 assocparams.sasoc_asocmaxrxt;
2912 if (assocparams.sasoc_cookie_life != 0)
2913 sp->assocparams.sasoc_cookie_life =
2914 assocparams.sasoc_cookie_life;
2915 }
2916 return 0;
2917}
2918
2919/*
2920 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2921 *
2922 * This socket option is a boolean flag which turns on or off mapped V4
2923 * addresses. If this option is turned on and the socket is type
2924 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2925 * If this option is turned off, then no mapping will be done of V4
2926 * addresses and a user will receive both PF_INET6 and PF_INET type
2927 * addresses on the socket.
2928 */
David S. Millerb7058842009-09-30 16:12:20 -07002929static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002930{
2931 int val;
2932 struct sctp_sock *sp = sctp_sk(sk);
2933
2934 if (optlen < sizeof(int))
2935 return -EINVAL;
2936 if (get_user(val, (int __user *)optval))
2937 return -EFAULT;
2938 if (val)
2939 sp->v4mapped = 1;
2940 else
2941 sp->v4mapped = 0;
2942
2943 return 0;
2944}
2945
2946/*
Wei Yongjune89c2092008-12-25 16:54:58 -08002947 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2948 * This option will get or set the maximum size to put in any outgoing
2949 * SCTP DATA chunk. If a message is larger than this size it will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07002950 * fragmented by SCTP into the specified size. Note that the underlying
2951 * SCTP implementation may fragment into smaller sized chunks when the
2952 * PMTU of the underlying association is smaller than the value set by
Wei Yongjune89c2092008-12-25 16:54:58 -08002953 * the user. The default value for this option is '0' which indicates
2954 * the user is NOT limiting fragmentation and only the PMTU will effect
2955 * SCTP's choice of DATA chunk size. Note also that values set larger
2956 * than the maximum size of an IP datagram will effectively let SCTP
2957 * control fragmentation (i.e. the same as setting this option to 0).
2958 *
2959 * The following structure is used to access and modify this parameter:
2960 *
2961 * struct sctp_assoc_value {
2962 * sctp_assoc_t assoc_id;
2963 * uint32_t assoc_value;
2964 * };
2965 *
2966 * assoc_id: This parameter is ignored for one-to-one style sockets.
2967 * For one-to-many style sockets this parameter indicates which
2968 * association the user is performing an action upon. Note that if
2969 * this field's value is zero then the endpoints default value is
2970 * changed (effecting future associations only).
2971 * assoc_value: This parameter specifies the maximum size in bytes.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002972 */
David S. Millerb7058842009-09-30 16:12:20 -07002973static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002974{
Wei Yongjune89c2092008-12-25 16:54:58 -08002975 struct sctp_assoc_value params;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002976 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002977 struct sctp_sock *sp = sctp_sk(sk);
2978 int val;
2979
Wei Yongjune89c2092008-12-25 16:54:58 -08002980 if (optlen == sizeof(int)) {
Joe Perches145ce502010-08-24 13:21:08 +00002981 pr_warn("Use of int in maxseg socket option deprecated\n");
2982 pr_warn("Use struct sctp_assoc_value instead\n");
Wei Yongjune89c2092008-12-25 16:54:58 -08002983 if (copy_from_user(&val, optval, optlen))
2984 return -EFAULT;
2985 params.assoc_id = 0;
2986 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2987 if (copy_from_user(&params, optval, optlen))
2988 return -EFAULT;
2989 val = params.assoc_value;
2990 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002991 return -EINVAL;
Wei Yongjune89c2092008-12-25 16:54:58 -08002992
Ivan Skytte Jorgensen96a33992005-10-28 15:36:12 -07002993 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002994 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002995
Wei Yongjune89c2092008-12-25 16:54:58 -08002996 asoc = sctp_id2assoc(sk, params.assoc_id);
2997 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
2998 return -EINVAL;
2999
3000 if (asoc) {
3001 if (val == 0) {
3002 val = asoc->pathmtu;
3003 val -= sp->pf->af->net_header_len;
3004 val -= sizeof(struct sctphdr) +
3005 sizeof(struct sctp_data_chunk);
3006 }
Vlad Yasevichf68b2e02009-09-04 18:21:00 -04003007 asoc->user_frag = val;
3008 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
Wei Yongjune89c2092008-12-25 16:54:58 -08003009 } else {
3010 sp->user_frag = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003011 }
3012
3013 return 0;
3014}
3015
3016
3017/*
3018 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3019 *
3020 * Requests that the peer mark the enclosed address as the association
3021 * primary. The enclosed address must be one of the association's
3022 * locally bound addresses. The following structure is used to make a
3023 * set primary request:
3024 */
3025static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003026 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003027{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003028 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003029 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003030 struct sctp_association *asoc = NULL;
3031 struct sctp_setpeerprim prim;
3032 struct sctp_chunk *chunk;
Wei Yongjun40a01032010-12-07 17:11:09 +00003033 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003034 int err;
3035
3036 sp = sctp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003037
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003038 if (!net->sctp.addip_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003039 return -EPERM;
3040
3041 if (optlen != sizeof(struct sctp_setpeerprim))
3042 return -EINVAL;
3043
3044 if (copy_from_user(&prim, optval, optlen))
3045 return -EFAULT;
3046
3047 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003048 if (!asoc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003049 return -EINVAL;
3050
3051 if (!asoc->peer.asconf_capable)
3052 return -EPERM;
3053
3054 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3055 return -EPERM;
3056
3057 if (!sctp_state(asoc, ESTABLISHED))
3058 return -ENOTCONN;
3059
Wei Yongjun40a01032010-12-07 17:11:09 +00003060 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3061 if (!af)
3062 return -EINVAL;
3063
3064 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3065 return -EADDRNOTAVAIL;
3066
Linus Torvalds1da177e2005-04-16 15:20:36 -07003067 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3068 return -EADDRNOTAVAIL;
3069
3070 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3071 chunk = sctp_make_asconf_set_prim(asoc,
3072 (union sctp_addr *)&prim.sspp_addr);
3073 if (!chunk)
3074 return -ENOMEM;
3075
3076 err = sctp_send_asconf(asoc, chunk);
3077
Daniel Borkmannbb333812013-06-28 19:49:40 +02003078 pr_debug("%s: we set peer primary addr primitively\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003079
3080 return err;
3081}
3082
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003083static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003084 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085{
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003086 struct sctp_setadaptation adaptation;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003087
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003088 if (optlen != sizeof(struct sctp_setadaptation))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003089 return -EINVAL;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003090 if (copy_from_user(&adaptation, optval, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003091 return -EFAULT;
3092
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003093 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003094
3095 return 0;
3096}
3097
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003098/*
3099 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3100 *
3101 * The context field in the sctp_sndrcvinfo structure is normally only
3102 * used when a failed message is retrieved holding the value that was
3103 * sent down on the actual send call. This option allows the setting of
3104 * a default context on an association basis that will be received on
3105 * reading messages from the peer. This is especially helpful in the
3106 * one-2-many model for an application to keep some reference to an
3107 * internal state machine that is processing messages on the
3108 * association. Note that the setting of this value only effects
3109 * received messages from the peer and does not effect the value that is
3110 * saved with outbound messages.
3111 */
3112static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003113 unsigned int optlen)
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003114{
3115 struct sctp_assoc_value params;
3116 struct sctp_sock *sp;
3117 struct sctp_association *asoc;
3118
3119 if (optlen != sizeof(struct sctp_assoc_value))
3120 return -EINVAL;
3121 if (copy_from_user(&params, optval, optlen))
3122 return -EFAULT;
3123
3124 sp = sctp_sk(sk);
3125
3126 if (params.assoc_id != 0) {
3127 asoc = sctp_id2assoc(sk, params.assoc_id);
3128 if (!asoc)
3129 return -EINVAL;
3130 asoc->default_rcv_context = params.assoc_value;
3131 } else {
3132 sp->default_rcv_context = params.assoc_value;
3133 }
3134
3135 return 0;
3136}
3137
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003138/*
3139 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3140 *
3141 * This options will at a minimum specify if the implementation is doing
3142 * fragmented interleave. Fragmented interleave, for a one to many
3143 * socket, is when subsequent calls to receive a message may return
3144 * parts of messages from different associations. Some implementations
3145 * may allow you to turn this value on or off. If so, when turned off,
3146 * no fragment interleave will occur (which will cause a head of line
3147 * blocking amongst multiple associations sharing the same one to many
3148 * socket). When this option is turned on, then each receive call may
3149 * come from a different association (thus the user must receive data
3150 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3151 * association each receive belongs to.
3152 *
3153 * This option takes a boolean value. A non-zero value indicates that
3154 * fragmented interleave is on. A value of zero indicates that
3155 * fragmented interleave is off.
3156 *
3157 * Note that it is important that an implementation that allows this
3158 * option to be turned on, have it off by default. Otherwise an unaware
3159 * application using the one to many model may become confused and act
3160 * incorrectly.
3161 */
3162static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3163 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003164 unsigned int optlen)
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003165{
3166 int val;
3167
3168 if (optlen != sizeof(int))
3169 return -EINVAL;
3170 if (get_user(val, (int __user *)optval))
3171 return -EFAULT;
3172
3173 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3174
3175 return 0;
3176}
3177
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003178/*
Wei Yongjun8510b932008-12-25 16:59:03 -08003179 * 8.1.21. Set or Get the SCTP Partial Delivery Point
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003180 * (SCTP_PARTIAL_DELIVERY_POINT)
Wei Yongjun8510b932008-12-25 16:59:03 -08003181 *
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003182 * This option will set or get the SCTP partial delivery point. This
3183 * point is the size of a message where the partial delivery API will be
3184 * invoked to help free up rwnd space for the peer. Setting this to a
Wei Yongjun8510b932008-12-25 16:59:03 -08003185 * lower value will cause partial deliveries to happen more often. The
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003186 * calls argument is an integer that sets or gets the partial delivery
Wei Yongjun8510b932008-12-25 16:59:03 -08003187 * point. Note also that the call will fail if the user attempts to set
3188 * this value larger than the socket receive buffer size.
3189 *
3190 * Note that any single message having a length smaller than or equal to
3191 * the SCTP partial delivery point will be delivered in one single read
3192 * call as long as the user provided buffer is large enough to hold the
3193 * message.
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003194 */
3195static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3196 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003197 unsigned int optlen)
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003198{
3199 u32 val;
3200
3201 if (optlen != sizeof(u32))
3202 return -EINVAL;
3203 if (get_user(val, (int __user *)optval))
3204 return -EFAULT;
3205
Wei Yongjun8510b932008-12-25 16:59:03 -08003206 /* Note: We double the receive buffer from what the user sets
3207 * it to be, also initial rwnd is based on rcvbuf/2.
3208 */
3209 if (val > (sk->sk_rcvbuf >> 1))
3210 return -EINVAL;
3211
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003212 sctp_sk(sk)->pd_point = val;
3213
3214 return 0; /* is this the right error code? */
3215}
3216
Vlad Yasevich70331572007-03-23 11:34:36 -07003217/*
3218 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3219 *
3220 * This option will allow a user to change the maximum burst of packets
3221 * that can be emitted by this association. Note that the default value
3222 * is 4, and some implementations may restrict this setting so that it
3223 * can only be lowered.
3224 *
3225 * NOTE: This text doesn't seem right. Do this on a socket basis with
3226 * future associations inheriting the socket value.
3227 */
3228static int sctp_setsockopt_maxburst(struct sock *sk,
3229 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003230 unsigned int optlen)
Vlad Yasevich70331572007-03-23 11:34:36 -07003231{
Neil Horman219b99a2008-03-05 13:44:46 -08003232 struct sctp_assoc_value params;
3233 struct sctp_sock *sp;
3234 struct sctp_association *asoc;
Vlad Yasevich70331572007-03-23 11:34:36 -07003235 int val;
Neil Horman219b99a2008-03-05 13:44:46 -08003236 int assoc_id = 0;
Vlad Yasevich70331572007-03-23 11:34:36 -07003237
Neil Horman219b99a2008-03-05 13:44:46 -08003238 if (optlen == sizeof(int)) {
Joe Perches145ce502010-08-24 13:21:08 +00003239 pr_warn("Use of int in max_burst socket option deprecated\n");
3240 pr_warn("Use struct sctp_assoc_value instead\n");
Neil Horman219b99a2008-03-05 13:44:46 -08003241 if (copy_from_user(&val, optval, optlen))
3242 return -EFAULT;
3243 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3244 if (copy_from_user(&params, optval, optlen))
3245 return -EFAULT;
3246 val = params.assoc_value;
3247 assoc_id = params.assoc_id;
3248 } else
3249 return -EINVAL;
3250
3251 sp = sctp_sk(sk);
3252
3253 if (assoc_id != 0) {
3254 asoc = sctp_id2assoc(sk, assoc_id);
3255 if (!asoc)
3256 return -EINVAL;
3257 asoc->max_burst = val;
3258 } else
3259 sp->max_burst = val;
Vlad Yasevich70331572007-03-23 11:34:36 -07003260
3261 return 0;
3262}
3263
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003264/*
3265 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3266 *
3267 * This set option adds a chunk type that the user is requesting to be
3268 * received only in an authenticated way. Changes to the list of chunks
3269 * will only effect future associations on the socket.
3270 */
3271static int sctp_setsockopt_auth_chunk(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003272 char __user *optval,
3273 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003274{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003275 struct net *net = sock_net(sk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003276 struct sctp_authchunk val;
3277
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003278 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003279 return -EACCES;
3280
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003281 if (optlen != sizeof(struct sctp_authchunk))
3282 return -EINVAL;
3283 if (copy_from_user(&val, optval, optlen))
3284 return -EFAULT;
3285
3286 switch (val.sauth_chunk) {
Joe Perches7fd71b12011-07-01 09:43:11 +00003287 case SCTP_CID_INIT:
3288 case SCTP_CID_INIT_ACK:
3289 case SCTP_CID_SHUTDOWN_COMPLETE:
3290 case SCTP_CID_AUTH:
3291 return -EINVAL;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003292 }
3293
3294 /* add this chunk id to the endpoint */
3295 return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk);
3296}
3297
3298/*
3299 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3300 *
3301 * This option gets or sets the list of HMAC algorithms that the local
3302 * endpoint requires the peer to use.
3303 */
3304static int sctp_setsockopt_hmac_ident(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003305 char __user *optval,
3306 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003307{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003308 struct net *net = sock_net(sk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003309 struct sctp_hmacalgo *hmacs;
Vlad Yasevichd9724052008-08-27 16:09:49 -07003310 u32 idents;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003311 int err;
3312
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003313 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003314 return -EACCES;
3315
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003316 if (optlen < sizeof(struct sctp_hmacalgo))
3317 return -EINVAL;
3318
Shan Wei934253a2011-04-18 19:13:18 +00003319 hmacs= memdup_user(optval, optlen);
3320 if (IS_ERR(hmacs))
3321 return PTR_ERR(hmacs);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003322
Vlad Yasevichd9724052008-08-27 16:09:49 -07003323 idents = hmacs->shmac_num_idents;
3324 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3325 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003326 err = -EINVAL;
3327 goto out;
3328 }
3329
3330 err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs);
3331out:
3332 kfree(hmacs);
3333 return err;
3334}
3335
3336/*
3337 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3338 *
3339 * This option will set a shared secret key which is used to build an
3340 * association shared key.
3341 */
3342static int sctp_setsockopt_auth_key(struct sock *sk,
3343 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003344 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003345{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003346 struct net *net = sock_net(sk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003347 struct sctp_authkey *authkey;
3348 struct sctp_association *asoc;
3349 int ret;
3350
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003351 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003352 return -EACCES;
3353
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003354 if (optlen <= sizeof(struct sctp_authkey))
3355 return -EINVAL;
3356
Shan Wei934253a2011-04-18 19:13:18 +00003357 authkey= memdup_user(optval, optlen);
3358 if (IS_ERR(authkey))
3359 return PTR_ERR(authkey);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003360
Vlad Yasevich328fc472008-08-27 16:08:54 -07003361 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
Vlad Yasevich30c22352008-08-25 15:16:19 -07003362 ret = -EINVAL;
3363 goto out;
3364 }
3365
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003366 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3367 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3368 ret = -EINVAL;
3369 goto out;
3370 }
3371
3372 ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
3373out:
Daniel Borkmann6ba542a2013-02-08 03:04:34 +00003374 kzfree(authkey);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003375 return ret;
3376}
3377
3378/*
3379 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3380 *
3381 * This option will get or set the active shared key to be used to build
3382 * the association shared key.
3383 */
3384static int sctp_setsockopt_active_key(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003385 char __user *optval,
3386 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003387{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003388 struct net *net = sock_net(sk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003389 struct sctp_authkeyid val;
3390 struct sctp_association *asoc;
3391
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003392 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003393 return -EACCES;
3394
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003395 if (optlen != sizeof(struct sctp_authkeyid))
3396 return -EINVAL;
3397 if (copy_from_user(&val, optval, optlen))
3398 return -EFAULT;
3399
3400 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3401 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3402 return -EINVAL;
3403
3404 return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc,
3405 val.scact_keynumber);
3406}
3407
3408/*
3409 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3410 *
3411 * This set option will delete a shared secret key from use.
3412 */
3413static int sctp_setsockopt_del_key(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003414 char __user *optval,
3415 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003416{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003417 struct net *net = sock_net(sk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003418 struct sctp_authkeyid val;
3419 struct sctp_association *asoc;
3420
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003421 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003422 return -EACCES;
3423
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003424 if (optlen != sizeof(struct sctp_authkeyid))
3425 return -EINVAL;
3426 if (copy_from_user(&val, optval, optlen))
3427 return -EFAULT;
3428
3429 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3430 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3431 return -EINVAL;
3432
3433 return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc,
3434 val.scact_keynumber);
3435
3436}
3437
Michio Honda7dc04d72011-04-26 20:16:31 +09003438/*
3439 * 8.1.23 SCTP_AUTO_ASCONF
3440 *
3441 * This option will enable or disable the use of the automatic generation of
3442 * ASCONF chunks to add and delete addresses to an existing association. Note
3443 * that this option has two caveats namely: a) it only affects sockets that
3444 * are bound to all addresses available to the SCTP stack, and b) the system
3445 * administrator may have an overriding control that turns the ASCONF feature
3446 * off no matter what setting the socket option may have.
3447 * This option expects an integer boolean flag, where a non-zero value turns on
3448 * the option, and a zero value turns off the option.
3449 * Note. In this implementation, socket operation overrides default parameter
3450 * being set by sysctl as well as FreeBSD implementation
3451 */
3452static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3453 unsigned int optlen)
3454{
3455 int val;
3456 struct sctp_sock *sp = sctp_sk(sk);
3457
3458 if (optlen < sizeof(int))
3459 return -EINVAL;
3460 if (get_user(val, (int __user *)optval))
3461 return -EFAULT;
3462 if (!sctp_is_ep_boundall(sk) && val)
3463 return -EINVAL;
3464 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3465 return 0;
3466
3467 if (val == 0 && sp->do_auto_asconf) {
3468 list_del(&sp->auto_asconf_list);
3469 sp->do_auto_asconf = 0;
3470 } else if (val && !sp->do_auto_asconf) {
3471 list_add_tail(&sp->auto_asconf_list,
Eric W. Biederman4db67e82012-08-06 08:42:04 +00003472 &sock_net(sk)->sctp.auto_asconf_splist);
Michio Honda7dc04d72011-04-26 20:16:31 +09003473 sp->do_auto_asconf = 1;
3474 }
3475 return 0;
3476}
3477
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003478
Neil Horman5aa93bc2012-07-21 07:56:07 +00003479/*
3480 * SCTP_PEER_ADDR_THLDS
3481 *
3482 * This option allows us to alter the partially failed threshold for one or all
3483 * transports in an association. See Section 6.1 of:
3484 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3485 */
3486static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3487 char __user *optval,
3488 unsigned int optlen)
3489{
3490 struct sctp_paddrthlds val;
3491 struct sctp_transport *trans;
3492 struct sctp_association *asoc;
3493
3494 if (optlen < sizeof(struct sctp_paddrthlds))
3495 return -EINVAL;
3496 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3497 sizeof(struct sctp_paddrthlds)))
3498 return -EFAULT;
3499
3500
3501 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3502 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3503 if (!asoc)
3504 return -ENOENT;
3505 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3506 transports) {
3507 if (val.spt_pathmaxrxt)
3508 trans->pathmaxrxt = val.spt_pathmaxrxt;
3509 trans->pf_retrans = val.spt_pathpfthld;
3510 }
3511
3512 if (val.spt_pathmaxrxt)
3513 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3514 asoc->pf_retrans = val.spt_pathpfthld;
3515 } else {
3516 trans = sctp_addr_id2transport(sk, &val.spt_address,
3517 val.spt_assoc_id);
3518 if (!trans)
3519 return -ENOENT;
3520
3521 if (val.spt_pathmaxrxt)
3522 trans->pathmaxrxt = val.spt_pathmaxrxt;
3523 trans->pf_retrans = val.spt_pathpfthld;
3524 }
3525
3526 return 0;
3527}
3528
Linus Torvalds1da177e2005-04-16 15:20:36 -07003529/* API 6.2 setsockopt(), getsockopt()
3530 *
3531 * Applications use setsockopt() and getsockopt() to set or retrieve
3532 * socket options. Socket options are used to change the default
3533 * behavior of sockets calls. They are described in Section 7.
3534 *
3535 * The syntax is:
3536 *
3537 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3538 * int __user *optlen);
3539 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3540 * int optlen);
3541 *
3542 * sd - the socket descript.
3543 * level - set to IPPROTO_SCTP for all SCTP options.
3544 * optname - the option name.
3545 * optval - the buffer to store the value of the option.
3546 * optlen - the size of the buffer.
3547 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003548static int sctp_setsockopt(struct sock *sk, int level, int optname,
3549 char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003550{
3551 int retval = 0;
3552
Daniel Borkmannbb333812013-06-28 19:49:40 +02003553 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003554
3555 /* I can hardly begin to describe how wrong this is. This is
3556 * so broken as to be worse than useless. The API draft
3557 * REALLY is NOT helpful here... I am not convinced that the
3558 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3559 * are at all well-founded.
3560 */
3561 if (level != SOL_SCTP) {
3562 struct sctp_af *af = sctp_sk(sk)->pf->af;
3563 retval = af->setsockopt(sk, level, optname, optval, optlen);
3564 goto out_nounlock;
3565 }
3566
3567 sctp_lock_sock(sk);
3568
3569 switch (optname) {
3570 case SCTP_SOCKOPT_BINDX_ADD:
3571 /* 'optlen' is the size of the addresses buffer. */
3572 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3573 optlen, SCTP_BINDX_ADD_ADDR);
3574 break;
3575
3576 case SCTP_SOCKOPT_BINDX_REM:
3577 /* 'optlen' is the size of the addresses buffer. */
3578 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3579 optlen, SCTP_BINDX_REM_ADDR);
3580 break;
3581
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003582 case SCTP_SOCKOPT_CONNECTX_OLD:
3583 /* 'optlen' is the size of the addresses buffer. */
3584 retval = sctp_setsockopt_connectx_old(sk,
3585 (struct sockaddr __user *)optval,
3586 optlen);
3587 break;
3588
Frank Filz3f7a87d2005-06-20 13:14:57 -07003589 case SCTP_SOCKOPT_CONNECTX:
3590 /* 'optlen' is the size of the addresses buffer. */
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003591 retval = sctp_setsockopt_connectx(sk,
3592 (struct sockaddr __user *)optval,
3593 optlen);
Frank Filz3f7a87d2005-06-20 13:14:57 -07003594 break;
3595
Linus Torvalds1da177e2005-04-16 15:20:36 -07003596 case SCTP_DISABLE_FRAGMENTS:
3597 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3598 break;
3599
3600 case SCTP_EVENTS:
3601 retval = sctp_setsockopt_events(sk, optval, optlen);
3602 break;
3603
3604 case SCTP_AUTOCLOSE:
3605 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3606 break;
3607
3608 case SCTP_PEER_ADDR_PARAMS:
3609 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3610 break;
3611
Shan Wei4580ccc2011-01-18 22:39:00 +00003612 case SCTP_DELAYED_SACK:
Wei Yongjund364d922008-05-09 15:13:26 -07003613 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
Frank Filz77086102005-12-22 11:37:30 -08003614 break;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003615 case SCTP_PARTIAL_DELIVERY_POINT:
3616 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3617 break;
Frank Filz77086102005-12-22 11:37:30 -08003618
Linus Torvalds1da177e2005-04-16 15:20:36 -07003619 case SCTP_INITMSG:
3620 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3621 break;
3622 case SCTP_DEFAULT_SEND_PARAM:
3623 retval = sctp_setsockopt_default_send_param(sk, optval,
3624 optlen);
3625 break;
3626 case SCTP_PRIMARY_ADDR:
3627 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3628 break;
3629 case SCTP_SET_PEER_PRIMARY_ADDR:
3630 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3631 break;
3632 case SCTP_NODELAY:
3633 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3634 break;
3635 case SCTP_RTOINFO:
3636 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3637 break;
3638 case SCTP_ASSOCINFO:
3639 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3640 break;
3641 case SCTP_I_WANT_MAPPED_V4_ADDR:
3642 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3643 break;
3644 case SCTP_MAXSEG:
3645 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3646 break;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003647 case SCTP_ADAPTATION_LAYER:
3648 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003649 break;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003650 case SCTP_CONTEXT:
3651 retval = sctp_setsockopt_context(sk, optval, optlen);
3652 break;
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003653 case SCTP_FRAGMENT_INTERLEAVE:
3654 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3655 break;
Vlad Yasevich70331572007-03-23 11:34:36 -07003656 case SCTP_MAX_BURST:
3657 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3658 break;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003659 case SCTP_AUTH_CHUNK:
3660 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3661 break;
3662 case SCTP_HMAC_IDENT:
3663 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3664 break;
3665 case SCTP_AUTH_KEY:
3666 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3667 break;
3668 case SCTP_AUTH_ACTIVE_KEY:
3669 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3670 break;
3671 case SCTP_AUTH_DELETE_KEY:
3672 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3673 break;
Michio Honda7dc04d72011-04-26 20:16:31 +09003674 case SCTP_AUTO_ASCONF:
3675 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3676 break;
Neil Horman5aa93bc2012-07-21 07:56:07 +00003677 case SCTP_PEER_ADDR_THLDS:
3678 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3679 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003680 default:
3681 retval = -ENOPROTOOPT;
3682 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07003683 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003684
3685 sctp_release_sock(sk);
3686
3687out_nounlock:
3688 return retval;
3689}
3690
3691/* API 3.1.6 connect() - UDP Style Syntax
3692 *
3693 * An application may use the connect() call in the UDP model to initiate an
3694 * association without sending data.
3695 *
3696 * The syntax is:
3697 *
3698 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3699 *
3700 * sd: the socket descriptor to have a new association added to.
3701 *
3702 * nam: the address structure (either struct sockaddr_in or struct
3703 * sockaddr_in6 defined in RFC2553 [7]).
3704 *
3705 * len: the size of the address.
3706 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003707static int sctp_connect(struct sock *sk, struct sockaddr *addr,
3708 int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003709{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003710 int err = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07003711 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003712
3713 sctp_lock_sock(sk);
3714
Daniel Borkmannbb333812013-06-28 19:49:40 +02003715 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
3716 addr, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003717
Frank Filz3f7a87d2005-06-20 13:14:57 -07003718 /* Validate addr_len before calling common connect/connectx routine. */
3719 af = sctp_get_af_specific(addr->sa_family);
3720 if (!af || addr_len < af->sockaddr_len) {
3721 err = -EINVAL;
3722 } else {
3723 /* Pass correct addr len to common routine (so it knows there
3724 * is only one address being passed.
3725 */
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003726 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003727 }
3728
Linus Torvalds1da177e2005-04-16 15:20:36 -07003729 sctp_release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003730 return err;
3731}
3732
3733/* FIXME: Write comments. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003734static int sctp_disconnect(struct sock *sk, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003735{
3736 return -EOPNOTSUPP; /* STUB */
3737}
3738
3739/* 4.1.4 accept() - TCP Style Syntax
3740 *
3741 * Applications use accept() call to remove an established SCTP
3742 * association from the accept queue of the endpoint. A new socket
3743 * descriptor will be returned from accept() to represent the newly
3744 * formed association.
3745 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003746static struct sock *sctp_accept(struct sock *sk, int flags, int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003747{
3748 struct sctp_sock *sp;
3749 struct sctp_endpoint *ep;
3750 struct sock *newsk = NULL;
3751 struct sctp_association *asoc;
3752 long timeo;
3753 int error = 0;
3754
3755 sctp_lock_sock(sk);
3756
3757 sp = sctp_sk(sk);
3758 ep = sp->ep;
3759
3760 if (!sctp_style(sk, TCP)) {
3761 error = -EOPNOTSUPP;
3762 goto out;
3763 }
3764
3765 if (!sctp_sstate(sk, LISTENING)) {
3766 error = -EINVAL;
3767 goto out;
3768 }
3769
Sridhar Samudrala8abfedd2006-08-22 00:24:09 -07003770 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003771
3772 error = sctp_wait_for_accept(sk, timeo);
3773 if (error)
3774 goto out;
3775
3776 /* We treat the list of associations on the endpoint as the accept
3777 * queue and pick the first association on the list.
3778 */
3779 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3780
3781 newsk = sp->pf->create_accept_sk(sk, asoc);
3782 if (!newsk) {
3783 error = -ENOMEM;
3784 goto out;
3785 }
3786
3787 /* Populate the fields of the newsk from the oldsk and migrate the
3788 * asoc to the newsk.
3789 */
3790 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3791
3792out:
3793 sctp_release_sock(sk);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003794 *err = error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003795 return newsk;
3796}
3797
3798/* The SCTP ioctl handler. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003799static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003800{
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003801 int rc = -ENOTCONN;
3802
3803 sctp_lock_sock(sk);
3804
3805 /*
3806 * SEQPACKET-style sockets in LISTENING state are valid, for
3807 * SCTP, so only discard TCP-style sockets in LISTENING state.
3808 */
3809 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3810 goto out;
3811
3812 switch (cmd) {
3813 case SIOCINQ: {
3814 struct sk_buff *skb;
3815 unsigned int amount = 0;
3816
3817 skb = skb_peek(&sk->sk_receive_queue);
3818 if (skb != NULL) {
3819 /*
3820 * We will only return the amount of this packet since
3821 * that is all that will be read.
3822 */
3823 amount = skb->len;
3824 }
3825 rc = put_user(amount, (int __user *)arg);
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003826 break;
David S. Miller9a7241c2010-10-03 22:14:37 -07003827 }
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003828 default:
3829 rc = -ENOIOCTLCMD;
3830 break;
3831 }
3832out:
3833 sctp_release_sock(sk);
3834 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003835}
3836
3837/* This is the function which gets called during socket creation to
3838 * initialized the SCTP-specific portion of the sock.
3839 * The sock structure should already be zero-filled memory.
3840 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003841static int sctp_init_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003842{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003843 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003844 struct sctp_sock *sp;
3845
Daniel Borkmannbb333812013-06-28 19:49:40 +02003846 pr_debug("%s: sk:%p\n", __func__, sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003847
3848 sp = sctp_sk(sk);
3849
3850 /* Initialize the SCTP per socket area. */
3851 switch (sk->sk_type) {
3852 case SOCK_SEQPACKET:
3853 sp->type = SCTP_SOCKET_UDP;
3854 break;
3855 case SOCK_STREAM:
3856 sp->type = SCTP_SOCKET_TCP;
3857 break;
3858 default:
3859 return -ESOCKTNOSUPPORT;
3860 }
3861
3862 /* Initialize default send parameters. These parameters can be
3863 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3864 */
3865 sp->default_stream = 0;
3866 sp->default_ppid = 0;
3867 sp->default_flags = 0;
3868 sp->default_context = 0;
3869 sp->default_timetolive = 0;
3870
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003871 sp->default_rcv_context = 0;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003872 sp->max_burst = net->sctp.max_burst;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003873
Neil Horman3c681982012-10-24 09:20:03 +00003874 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
3875
Linus Torvalds1da177e2005-04-16 15:20:36 -07003876 /* Initialize default setup parameters. These parameters
3877 * can be modified with the SCTP_INITMSG socket option or
3878 * overridden by the SCTP_INIT CMSG.
3879 */
3880 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
3881 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003882 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
3883 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003884
3885 /* Initialize default RTO related parameters. These parameters can
3886 * be modified for with the SCTP_RTOINFO socket option.
3887 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003888 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
3889 sp->rtoinfo.srto_max = net->sctp.rto_max;
3890 sp->rtoinfo.srto_min = net->sctp.rto_min;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003891
3892 /* Initialize default association related parameters. These parameters
3893 * can be modified with the SCTP_ASSOCINFO socket option.
3894 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003895 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003896 sp->assocparams.sasoc_number_peer_destinations = 0;
3897 sp->assocparams.sasoc_peer_rwnd = 0;
3898 sp->assocparams.sasoc_local_rwnd = 0;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003899 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003900
3901 /* Initialize default event subscriptions. By default, all the
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003902 * options are off.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003903 */
3904 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3905
3906 /* Default Peer Address Parameters. These defaults can
3907 * be modified via SCTP_PEER_ADDR_PARAMS
3908 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003909 sp->hbinterval = net->sctp.hb_interval;
3910 sp->pathmaxrxt = net->sctp.max_retrans_path;
Frank Filz52ccb8e2005-12-22 11:36:46 -08003911 sp->pathmtu = 0; // allow default discovery
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003912 sp->sackdelay = net->sctp.sack_timeout;
Vlad Yasevich7bfe8bd2008-06-09 15:45:05 -07003913 sp->sackfreq = 2;
Frank Filz52ccb8e2005-12-22 11:36:46 -08003914 sp->param_flags = SPP_HB_ENABLE |
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003915 SPP_PMTUD_ENABLE |
3916 SPP_SACKDELAY_ENABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003917
3918 /* If enabled no SCTP message fragmentation will be performed.
3919 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3920 */
3921 sp->disable_fragments = 0;
3922
Sridhar Samudrala208edef2006-09-29 17:08:01 -07003923 /* Enable Nagle algorithm by default. */
3924 sp->nodelay = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003925
3926 /* Enable by default. */
3927 sp->v4mapped = 1;
3928
3929 /* Auto-close idle associations after the configured
3930 * number of seconds. A value of 0 disables this
3931 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3932 * for UDP-style sockets only.
3933 */
3934 sp->autoclose = 0;
3935
3936 /* User specified fragmentation limit. */
3937 sp->user_frag = 0;
3938
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003939 sp->adaptation_ind = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003940
3941 sp->pf = sctp_get_pf_specific(sk->sk_family);
3942
3943 /* Control variables for partial data delivery. */
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003944 atomic_set(&sp->pd_mode, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003945 skb_queue_head_init(&sp->pd_lobby);
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003946 sp->frag_interleave = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003947
3948 /* Create a per socket endpoint structure. Even if we
3949 * change the data structure relationships, this may still
3950 * be useful for storing pre-connect address information.
3951 */
Daniel Borkmannc164b832013-06-14 18:24:06 +02003952 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
3953 if (!sp->ep)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003954 return -ENOMEM;
3955
Linus Torvalds1da177e2005-04-16 15:20:36 -07003956 sp->hmac = NULL;
3957
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +02003958 sk->sk_destruct = sctp_destruct_sock;
3959
Linus Torvalds1da177e2005-04-16 15:20:36 -07003960 SCTP_DBG_OBJCNT_INC(sock);
David S. Miller6f756a82008-11-23 17:34:03 -08003961
3962 local_bh_disable();
Vlad Yasevich81419d82010-04-28 08:47:20 +00003963 percpu_counter_inc(&sctp_sockets_allocated);
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003964 sock_prot_inuse_add(net, sk->sk_prot, 1);
3965 if (net->sctp.default_auto_asconf) {
Michio Honda9f7d6532011-04-26 19:32:51 +09003966 list_add_tail(&sp->auto_asconf_list,
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003967 &net->sctp.auto_asconf_splist);
Michio Honda9f7d6532011-04-26 19:32:51 +09003968 sp->do_auto_asconf = 1;
3969 } else
3970 sp->do_auto_asconf = 0;
David S. Miller6f756a82008-11-23 17:34:03 -08003971 local_bh_enable();
3972
Linus Torvalds1da177e2005-04-16 15:20:36 -07003973 return 0;
3974}
3975
3976/* Cleanup any SCTP per socket resources. */
Daniel Borkmanndda91922013-06-17 11:40:05 +02003977static void sctp_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003978{
Michio Honda9f7d6532011-04-26 19:32:51 +09003979 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003980
Daniel Borkmannbb333812013-06-28 19:49:40 +02003981 pr_debug("%s: sk:%p\n", __func__, sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003982
3983 /* Release our hold on the endpoint. */
Michio Honda9f7d6532011-04-26 19:32:51 +09003984 sp = sctp_sk(sk);
Daniel Borkmann1abd1652013-06-06 15:53:47 +02003985 /* This could happen during socket init, thus we bail out
3986 * early, since the rest of the below is not setup either.
3987 */
3988 if (sp->ep == NULL)
3989 return;
3990
Michio Honda9f7d6532011-04-26 19:32:51 +09003991 if (sp->do_auto_asconf) {
3992 sp->do_auto_asconf = 0;
3993 list_del(&sp->auto_asconf_list);
3994 }
3995 sctp_endpoint_free(sp->ep);
Eric Dumazet5bc0b3b2008-11-25 13:53:27 -08003996 local_bh_disable();
Vlad Yasevich81419d82010-04-28 08:47:20 +00003997 percpu_counter_dec(&sctp_sockets_allocated);
Eric Dumazet9a57f7f2008-11-17 02:41:00 -08003998 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
Eric Dumazet5bc0b3b2008-11-25 13:53:27 -08003999 local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004000}
4001
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +02004002/* Triggered when there are no references on the socket anymore */
4003static void sctp_destruct_sock(struct sock *sk)
4004{
4005 struct sctp_sock *sp = sctp_sk(sk);
4006
4007 /* Free up the HMAC transform. */
4008 crypto_free_hash(sp->hmac);
4009
4010 inet_sock_destruct(sk);
4011}
4012
Linus Torvalds1da177e2005-04-16 15:20:36 -07004013/* API 4.1.7 shutdown() - TCP Style Syntax
4014 * int shutdown(int socket, int how);
4015 *
4016 * sd - the socket descriptor of the association to be closed.
4017 * how - Specifies the type of shutdown. The values are
4018 * as follows:
4019 * SHUT_RD
4020 * Disables further receive operations. No SCTP
4021 * protocol action is taken.
4022 * SHUT_WR
4023 * Disables further send operations, and initiates
4024 * the SCTP shutdown sequence.
4025 * SHUT_RDWR
4026 * Disables further send and receive operations
4027 * and initiates the SCTP shutdown sequence.
4028 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02004029static void sctp_shutdown(struct sock *sk, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004030{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00004031 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004032 struct sctp_endpoint *ep;
4033 struct sctp_association *asoc;
4034
4035 if (!sctp_style(sk, TCP))
4036 return;
4037
4038 if (how & SEND_SHUTDOWN) {
4039 ep = sctp_sk(sk)->ep;
4040 if (!list_empty(&ep->asocs)) {
4041 asoc = list_entry(ep->asocs.next,
4042 struct sctp_association, asocs);
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00004043 sctp_primitive_SHUTDOWN(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004044 }
4045 }
4046}
4047
4048/* 7.2.1 Association Status (SCTP_STATUS)
4049
4050 * Applications can retrieve current status information about an
4051 * association, including association state, peer receiver window size,
4052 * number of unacked data chunks, and number of data chunks pending
4053 * receipt. This information is read-only.
4054 */
4055static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4056 char __user *optval,
4057 int __user *optlen)
4058{
4059 struct sctp_status status;
4060 struct sctp_association *asoc = NULL;
4061 struct sctp_transport *transport;
4062 sctp_assoc_t associd;
4063 int retval = 0;
4064
Neil Horman408f22e2007-06-16 14:03:45 -04004065 if (len < sizeof(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004066 retval = -EINVAL;
4067 goto out;
4068 }
4069
Neil Horman408f22e2007-06-16 14:03:45 -04004070 len = sizeof(status);
4071 if (copy_from_user(&status, optval, len)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004072 retval = -EFAULT;
4073 goto out;
4074 }
4075
4076 associd = status.sstat_assoc_id;
4077 asoc = sctp_id2assoc(sk, associd);
4078 if (!asoc) {
4079 retval = -EINVAL;
4080 goto out;
4081 }
4082
4083 transport = asoc->peer.primary_path;
4084
4085 status.sstat_assoc_id = sctp_assoc2id(asoc);
4086 status.sstat_state = asoc->state;
4087 status.sstat_rwnd = asoc->peer.rwnd;
4088 status.sstat_unackdata = asoc->unack_data;
4089
4090 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4091 status.sstat_instrms = asoc->c.sinit_max_instreams;
4092 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4093 status.sstat_fragmentation_point = asoc->frag_point;
4094 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
Al Viro8cec6b82006-11-20 17:23:01 -08004095 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4096 transport->af_specific->sockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004097 /* Map ipv4 address into v4-mapped-on-v6 address. */
4098 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4099 (union sctp_addr *)&status.sstat_primary.spinfo_address);
Frank Filz3f7a87d2005-06-20 13:14:57 -07004100 status.sstat_primary.spinfo_state = transport->state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004101 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4102 status.sstat_primary.spinfo_srtt = transport->srtt;
4103 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
Frank Filz52ccb8e2005-12-22 11:36:46 -08004104 status.sstat_primary.spinfo_mtu = transport->pathmtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004105
Frank Filz3f7a87d2005-06-20 13:14:57 -07004106 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4107 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4108
Linus Torvalds1da177e2005-04-16 15:20:36 -07004109 if (put_user(len, optlen)) {
4110 retval = -EFAULT;
4111 goto out;
4112 }
4113
Daniel Borkmannbb333812013-06-28 19:49:40 +02004114 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4115 __func__, len, status.sstat_state, status.sstat_rwnd,
4116 status.sstat_assoc_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004117
4118 if (copy_to_user(optval, &status, len)) {
4119 retval = -EFAULT;
4120 goto out;
4121 }
4122
4123out:
Eric Dumazeta02cec22010-09-22 20:43:57 +00004124 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004125}
4126
4127
4128/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4129 *
4130 * Applications can retrieve information about a specific peer address
4131 * of an association, including its reachability state, congestion
4132 * window, and retransmission timer values. This information is
4133 * read-only.
4134 */
4135static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4136 char __user *optval,
4137 int __user *optlen)
4138{
4139 struct sctp_paddrinfo pinfo;
4140 struct sctp_transport *transport;
4141 int retval = 0;
4142
Neil Horman408f22e2007-06-16 14:03:45 -04004143 if (len < sizeof(pinfo)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004144 retval = -EINVAL;
4145 goto out;
4146 }
4147
Neil Horman408f22e2007-06-16 14:03:45 -04004148 len = sizeof(pinfo);
4149 if (copy_from_user(&pinfo, optval, len)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004150 retval = -EFAULT;
4151 goto out;
4152 }
4153
4154 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4155 pinfo.spinfo_assoc_id);
4156 if (!transport)
4157 return -EINVAL;
4158
4159 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
Frank Filz3f7a87d2005-06-20 13:14:57 -07004160 pinfo.spinfo_state = transport->state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004161 pinfo.spinfo_cwnd = transport->cwnd;
4162 pinfo.spinfo_srtt = transport->srtt;
4163 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
Frank Filz52ccb8e2005-12-22 11:36:46 -08004164 pinfo.spinfo_mtu = transport->pathmtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004165
Frank Filz3f7a87d2005-06-20 13:14:57 -07004166 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4167 pinfo.spinfo_state = SCTP_ACTIVE;
4168
Linus Torvalds1da177e2005-04-16 15:20:36 -07004169 if (put_user(len, optlen)) {
4170 retval = -EFAULT;
4171 goto out;
4172 }
4173
4174 if (copy_to_user(optval, &pinfo, len)) {
4175 retval = -EFAULT;
4176 goto out;
4177 }
4178
4179out:
Eric Dumazeta02cec22010-09-22 20:43:57 +00004180 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004181}
4182
4183/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4184 *
4185 * This option is a on/off flag. If enabled no SCTP message
4186 * fragmentation will be performed. Instead if a message being sent
4187 * exceeds the current PMTU size, the message will NOT be sent and
4188 * instead a error will be indicated to the user.
4189 */
4190static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4191 char __user *optval, int __user *optlen)
4192{
4193 int val;
4194
4195 if (len < sizeof(int))
4196 return -EINVAL;
4197
4198 len = sizeof(int);
4199 val = (sctp_sk(sk)->disable_fragments == 1);
4200 if (put_user(len, optlen))
4201 return -EFAULT;
4202 if (copy_to_user(optval, &val, len))
4203 return -EFAULT;
4204 return 0;
4205}
4206
4207/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4208 *
4209 * This socket option is used to specify various notifications and
4210 * ancillary data the user wishes to receive.
4211 */
4212static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4213 int __user *optlen)
4214{
Thomas Grafacdd5982012-04-03 22:17:53 +00004215 if (len <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004216 return -EINVAL;
Thomas Grafacdd5982012-04-03 22:17:53 +00004217 if (len > sizeof(struct sctp_event_subscribe))
4218 len = sizeof(struct sctp_event_subscribe);
Neil Horman408f22e2007-06-16 14:03:45 -04004219 if (put_user(len, optlen))
4220 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004221 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4222 return -EFAULT;
4223 return 0;
4224}
4225
4226/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4227 *
4228 * This socket option is applicable to the UDP-style socket only. When
4229 * set it will cause associations that are idle for more than the
4230 * specified number of seconds to automatically close. An association
4231 * being idle is defined an association that has NOT sent or received
4232 * user data. The special value of '0' indicates that no automatic
4233 * close of any associations should be performed. The option expects an
4234 * integer defining the number of seconds of idle time before an
4235 * association is closed.
4236 */
4237static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4238{
4239 /* Applicable to UDP-style socket only */
4240 if (sctp_style(sk, TCP))
4241 return -EOPNOTSUPP;
Neil Horman408f22e2007-06-16 14:03:45 -04004242 if (len < sizeof(int))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004243 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004244 len = sizeof(int);
4245 if (put_user(len, optlen))
4246 return -EFAULT;
4247 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004248 return -EFAULT;
4249 return 0;
4250}
4251
4252/* Helper routine to branch off an association to a new socket. */
Benjamin Poirier0343c552012-03-08 05:55:58 +00004253int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004254{
Benjamin Poirier0343c552012-03-08 05:55:58 +00004255 struct sctp_association *asoc = sctp_id2assoc(sk, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004256 struct socket *sock;
Vlad Yasevichd570ee42007-05-15 16:32:39 -04004257 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004258 int err = 0;
4259
Benjamin Poirier0343c552012-03-08 05:55:58 +00004260 if (!asoc)
4261 return -EINVAL;
4262
Linus Torvalds1da177e2005-04-16 15:20:36 -07004263 /* An association cannot be branched off from an already peeled-off
4264 * socket, nor is this supported for tcp style sockets.
4265 */
4266 if (!sctp_style(sk, UDP))
4267 return -EINVAL;
4268
4269 /* Create a new socket. */
4270 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4271 if (err < 0)
4272 return err;
4273
Vlad Yasevich914e1c82009-02-13 08:33:44 +00004274 sctp_copy_sock(sock->sk, sk, asoc);
Vlad Yasevich4f444302006-10-30 18:54:32 -08004275
4276 /* Make peeled-off sockets more like 1-1 accepted sockets.
4277 * Set the daddr and initialize id to something more random
4278 */
Vlad Yasevichd570ee42007-05-15 16:32:39 -04004279 af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
4280 af->to_sk_daddr(&asoc->peer.primary_addr, sk);
Vlad Yasevich914e1c82009-02-13 08:33:44 +00004281
4282 /* Populate the fields of the newsk from the oldsk and migrate the
4283 * asoc to the newsk.
4284 */
4285 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
Vlad Yasevich4f444302006-10-30 18:54:32 -08004286
Linus Torvalds1da177e2005-04-16 15:20:36 -07004287 *sockp = sock;
4288
4289 return err;
4290}
Benjamin Poirier0343c552012-03-08 05:55:58 +00004291EXPORT_SYMBOL(sctp_do_peeloff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004292
4293static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4294{
4295 sctp_peeloff_arg_t peeloff;
4296 struct socket *newsock;
Al Viro56b31d12012-08-18 00:25:51 -04004297 struct file *newfile;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004298 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004299
Neil Horman408f22e2007-06-16 14:03:45 -04004300 if (len < sizeof(sctp_peeloff_arg_t))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004301 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004302 len = sizeof(sctp_peeloff_arg_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004303 if (copy_from_user(&peeloff, optval, len))
4304 return -EFAULT;
4305
Benjamin Poirier0343c552012-03-08 05:55:58 +00004306 retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004307 if (retval < 0)
4308 goto out;
4309
4310 /* Map the socket to an unused fd that can be returned to the user. */
Yann Droneaud8a59bd32013-07-02 18:39:36 +02004311 retval = get_unused_fd_flags(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004312 if (retval < 0) {
4313 sock_release(newsock);
4314 goto out;
4315 }
4316
Linus Torvaldsaab174f2012-10-02 20:25:04 -07004317 newfile = sock_alloc_file(newsock, 0, NULL);
Al Viro56b31d12012-08-18 00:25:51 -04004318 if (unlikely(IS_ERR(newfile))) {
4319 put_unused_fd(retval);
4320 sock_release(newsock);
4321 return PTR_ERR(newfile);
4322 }
4323
Daniel Borkmannbb333812013-06-28 19:49:40 +02004324 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
4325 retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004326
4327 /* Return the fd mapped to the new socket. */
Al Viro56b31d12012-08-18 00:25:51 -04004328 if (put_user(len, optlen)) {
4329 fput(newfile);
4330 put_unused_fd(retval);
Neil Horman408f22e2007-06-16 14:03:45 -04004331 return -EFAULT;
Al Viro56b31d12012-08-18 00:25:51 -04004332 }
4333 peeloff.sd = retval;
4334 if (copy_to_user(optval, &peeloff, len)) {
4335 fput(newfile);
4336 put_unused_fd(retval);
4337 return -EFAULT;
4338 }
4339 fd_install(retval, newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004340out:
4341 return retval;
4342}
4343
4344/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4345 *
4346 * Applications can enable or disable heartbeats for any peer address of
4347 * an association, modify an address's heartbeat interval, force a
4348 * heartbeat to be sent immediately, and adjust the address's maximum
4349 * number of retransmissions sent before an address is considered
4350 * unreachable. The following structure is used to access and modify an
4351 * address's parameters:
4352 *
4353 * struct sctp_paddrparams {
Frank Filz52ccb8e2005-12-22 11:36:46 -08004354 * sctp_assoc_t spp_assoc_id;
4355 * struct sockaddr_storage spp_address;
4356 * uint32_t spp_hbinterval;
4357 * uint16_t spp_pathmaxrxt;
4358 * uint32_t spp_pathmtu;
4359 * uint32_t spp_sackdelay;
4360 * uint32_t spp_flags;
4361 * };
Linus Torvalds1da177e2005-04-16 15:20:36 -07004362 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08004363 * spp_assoc_id - (one-to-many style socket) This is filled in the
4364 * application, and identifies the association for
4365 * this query.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004366 * spp_address - This specifies which address is of interest.
4367 * spp_hbinterval - This contains the value of the heartbeat interval,
Frank Filz52ccb8e2005-12-22 11:36:46 -08004368 * in milliseconds. If a value of zero
4369 * is present in this field then no changes are to
4370 * be made to this parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004371 * spp_pathmaxrxt - This contains the maximum number of
4372 * retransmissions before this address shall be
Frank Filz52ccb8e2005-12-22 11:36:46 -08004373 * considered unreachable. If a value of zero
4374 * is present in this field then no changes are to
4375 * be made to this parameter.
4376 * spp_pathmtu - When Path MTU discovery is disabled the value
4377 * specified here will be the "fixed" path mtu.
4378 * Note that if the spp_address field is empty
4379 * then all associations on this address will
4380 * have this fixed path mtu set upon them.
4381 *
4382 * spp_sackdelay - When delayed sack is enabled, this value specifies
4383 * the number of milliseconds that sacks will be delayed
4384 * for. This value will apply to all addresses of an
4385 * association if the spp_address field is empty. Note
4386 * also, that if delayed sack is enabled and this
4387 * value is set to 0, no change is made to the last
4388 * recorded delayed sack timer value.
4389 *
4390 * spp_flags - These flags are used to control various features
4391 * on an association. The flag field may contain
4392 * zero or more of the following options.
4393 *
4394 * SPP_HB_ENABLE - Enable heartbeats on the
4395 * specified address. Note that if the address
4396 * field is empty all addresses for the association
4397 * have heartbeats enabled upon them.
4398 *
4399 * SPP_HB_DISABLE - Disable heartbeats on the
4400 * speicifed address. Note that if the address
4401 * field is empty all addresses for the association
4402 * will have their heartbeats disabled. Note also
4403 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4404 * mutually exclusive, only one of these two should
4405 * be specified. Enabling both fields will have
4406 * undetermined results.
4407 *
4408 * SPP_HB_DEMAND - Request a user initiated heartbeat
4409 * to be made immediately.
4410 *
4411 * SPP_PMTUD_ENABLE - This field will enable PMTU
4412 * discovery upon the specified address. Note that
4413 * if the address feild is empty then all addresses
4414 * on the association are effected.
4415 *
4416 * SPP_PMTUD_DISABLE - This field will disable PMTU
4417 * discovery upon the specified address. Note that
4418 * if the address feild is empty then all addresses
4419 * on the association are effected. Not also that
4420 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4421 * exclusive. Enabling both will have undetermined
4422 * results.
4423 *
4424 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4425 * on delayed sack. The time specified in spp_sackdelay
4426 * is used to specify the sack delay for this address. Note
4427 * that if spp_address is empty then all addresses will
4428 * enable delayed sack and take on the sack delay
4429 * value specified in spp_sackdelay.
4430 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4431 * off delayed sack. If the spp_address field is blank then
4432 * delayed sack is disabled for the entire association. Note
4433 * also that this field is mutually exclusive to
4434 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4435 * results.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004436 */
4437static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
Frank Filz52ccb8e2005-12-22 11:36:46 -08004438 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004439{
Frank Filz52ccb8e2005-12-22 11:36:46 -08004440 struct sctp_paddrparams params;
4441 struct sctp_transport *trans = NULL;
4442 struct sctp_association *asoc = NULL;
4443 struct sctp_sock *sp = sctp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004444
Neil Horman408f22e2007-06-16 14:03:45 -04004445 if (len < sizeof(struct sctp_paddrparams))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004446 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004447 len = sizeof(struct sctp_paddrparams);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004448 if (copy_from_user(&params, optval, len))
4449 return -EFAULT;
4450
Frank Filz52ccb8e2005-12-22 11:36:46 -08004451 /* If an address other than INADDR_ANY is specified, and
4452 * no transport is found, then the request is invalid.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004453 */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -04004454 if (!sctp_is_any(sk, ( union sctp_addr *)&params.spp_address)) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08004455 trans = sctp_addr_id2transport(sk, &params.spp_address,
4456 params.spp_assoc_id);
4457 if (!trans) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02004458 pr_debug("%s: failed no transport\n", __func__);
Frank Filz52ccb8e2005-12-22 11:36:46 -08004459 return -EINVAL;
4460 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004461 }
4462
Frank Filz52ccb8e2005-12-22 11:36:46 -08004463 /* Get association, if assoc_id != 0 and the socket is a one
4464 * to many style socket, and an association was not found, then
4465 * the id was invalid.
4466 */
4467 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4468 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
Daniel Borkmannbb333812013-06-28 19:49:40 +02004469 pr_debug("%s: failed no association\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004470 return -EINVAL;
Frank Filz52ccb8e2005-12-22 11:36:46 -08004471 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004472
Frank Filz52ccb8e2005-12-22 11:36:46 -08004473 if (trans) {
4474 /* Fetch transport values. */
4475 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4476 params.spp_pathmtu = trans->pathmtu;
4477 params.spp_pathmaxrxt = trans->pathmaxrxt;
4478 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004479
Frank Filz52ccb8e2005-12-22 11:36:46 -08004480 /*draft-11 doesn't say what to return in spp_flags*/
4481 params.spp_flags = trans->param_flags;
4482 } else if (asoc) {
4483 /* Fetch association values. */
4484 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4485 params.spp_pathmtu = asoc->pathmtu;
4486 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4487 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004488
Frank Filz52ccb8e2005-12-22 11:36:46 -08004489 /*draft-11 doesn't say what to return in spp_flags*/
4490 params.spp_flags = asoc->param_flags;
4491 } else {
4492 /* Fetch socket values. */
4493 params.spp_hbinterval = sp->hbinterval;
4494 params.spp_pathmtu = sp->pathmtu;
4495 params.spp_sackdelay = sp->sackdelay;
4496 params.spp_pathmaxrxt = sp->pathmaxrxt;
4497
4498 /*draft-11 doesn't say what to return in spp_flags*/
4499 params.spp_flags = sp->param_flags;
4500 }
4501
Linus Torvalds1da177e2005-04-16 15:20:36 -07004502 if (copy_to_user(optval, &params, len))
4503 return -EFAULT;
4504
4505 if (put_user(len, optlen))
4506 return -EFAULT;
4507
4508 return 0;
4509}
4510
Wei Yongjund364d922008-05-09 15:13:26 -07004511/*
4512 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
Frank Filz77086102005-12-22 11:37:30 -08004513 *
Wei Yongjund364d922008-05-09 15:13:26 -07004514 * This option will effect the way delayed acks are performed. This
4515 * option allows you to get or set the delayed ack time, in
4516 * milliseconds. It also allows changing the delayed ack frequency.
4517 * Changing the frequency to 1 disables the delayed sack algorithm. If
4518 * the assoc_id is 0, then this sets or gets the endpoints default
4519 * values. If the assoc_id field is non-zero, then the set or get
4520 * effects the specified association for the one to many model (the
4521 * assoc_id field is ignored by the one to one model). Note that if
4522 * sack_delay or sack_freq are 0 when setting this option, then the
4523 * current values will remain unchanged.
Frank Filz77086102005-12-22 11:37:30 -08004524 *
Wei Yongjund364d922008-05-09 15:13:26 -07004525 * struct sctp_sack_info {
4526 * sctp_assoc_t sack_assoc_id;
4527 * uint32_t sack_delay;
4528 * uint32_t sack_freq;
4529 * };
Frank Filz77086102005-12-22 11:37:30 -08004530 *
Wei Yongjund364d922008-05-09 15:13:26 -07004531 * sack_assoc_id - This parameter, indicates which association the user
4532 * is performing an action upon. Note that if this field's value is
4533 * zero then the endpoints default value is changed (effecting future
4534 * associations only).
Frank Filz77086102005-12-22 11:37:30 -08004535 *
Wei Yongjund364d922008-05-09 15:13:26 -07004536 * sack_delay - This parameter contains the number of milliseconds that
4537 * the user is requesting the delayed ACK timer be set to. Note that
4538 * this value is defined in the standard to be between 200 and 500
4539 * milliseconds.
Frank Filz77086102005-12-22 11:37:30 -08004540 *
Wei Yongjund364d922008-05-09 15:13:26 -07004541 * sack_freq - This parameter contains the number of packets that must
4542 * be received before a sack is sent without waiting for the delay
4543 * timer to expire. The default value for this is 2, setting this
4544 * value to 1 will disable the delayed sack algorithm.
Frank Filz77086102005-12-22 11:37:30 -08004545 */
Wei Yongjund364d922008-05-09 15:13:26 -07004546static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
Frank Filz77086102005-12-22 11:37:30 -08004547 char __user *optval,
4548 int __user *optlen)
4549{
Wei Yongjund364d922008-05-09 15:13:26 -07004550 struct sctp_sack_info params;
Frank Filz77086102005-12-22 11:37:30 -08004551 struct sctp_association *asoc = NULL;
4552 struct sctp_sock *sp = sctp_sk(sk);
4553
Wei Yongjund364d922008-05-09 15:13:26 -07004554 if (len >= sizeof(struct sctp_sack_info)) {
4555 len = sizeof(struct sctp_sack_info);
4556
4557 if (copy_from_user(&params, optval, len))
4558 return -EFAULT;
4559 } else if (len == sizeof(struct sctp_assoc_value)) {
Joe Perches145ce502010-08-24 13:21:08 +00004560 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4561 pr_warn("Use struct sctp_sack_info instead\n");
Wei Yongjund364d922008-05-09 15:13:26 -07004562 if (copy_from_user(&params, optval, len))
4563 return -EFAULT;
4564 } else
Frank Filz77086102005-12-22 11:37:30 -08004565 return - EINVAL;
4566
Wei Yongjund364d922008-05-09 15:13:26 -07004567 /* Get association, if sack_assoc_id != 0 and the socket is a one
Frank Filz77086102005-12-22 11:37:30 -08004568 * to many style socket, and an association was not found, then
4569 * the id was invalid.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004570 */
Wei Yongjund364d922008-05-09 15:13:26 -07004571 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4572 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
Frank Filz77086102005-12-22 11:37:30 -08004573 return -EINVAL;
4574
4575 if (asoc) {
4576 /* Fetch association values. */
Wei Yongjund364d922008-05-09 15:13:26 -07004577 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4578 params.sack_delay = jiffies_to_msecs(
Frank Filz77086102005-12-22 11:37:30 -08004579 asoc->sackdelay);
Wei Yongjund364d922008-05-09 15:13:26 -07004580 params.sack_freq = asoc->sackfreq;
4581
4582 } else {
4583 params.sack_delay = 0;
4584 params.sack_freq = 1;
4585 }
Frank Filz77086102005-12-22 11:37:30 -08004586 } else {
4587 /* Fetch socket values. */
Wei Yongjund364d922008-05-09 15:13:26 -07004588 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4589 params.sack_delay = sp->sackdelay;
4590 params.sack_freq = sp->sackfreq;
4591 } else {
4592 params.sack_delay = 0;
4593 params.sack_freq = 1;
4594 }
Frank Filz77086102005-12-22 11:37:30 -08004595 }
4596
4597 if (copy_to_user(optval, &params, len))
4598 return -EFAULT;
4599
4600 if (put_user(len, optlen))
4601 return -EFAULT;
4602
4603 return 0;
4604}
4605
Linus Torvalds1da177e2005-04-16 15:20:36 -07004606/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4607 *
4608 * Applications can specify protocol parameters for the default association
4609 * initialization. The option name argument to setsockopt() and getsockopt()
4610 * is SCTP_INITMSG.
4611 *
4612 * Setting initialization parameters is effective only on an unconnected
4613 * socket (for UDP-style sockets only future associations are effected
4614 * by the change). With TCP-style sockets, this option is inherited by
4615 * sockets derived from a listener socket.
4616 */
4617static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4618{
Neil Horman408f22e2007-06-16 14:03:45 -04004619 if (len < sizeof(struct sctp_initmsg))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004620 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004621 len = sizeof(struct sctp_initmsg);
4622 if (put_user(len, optlen))
4623 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004624 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4625 return -EFAULT;
4626 return 0;
4627}
4628
Linus Torvalds1da177e2005-04-16 15:20:36 -07004629
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004630static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4631 char __user *optval, int __user *optlen)
4632{
4633 struct sctp_association *asoc;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004634 int cnt = 0;
4635 struct sctp_getaddrs getaddrs;
4636 struct sctp_transport *from;
4637 void __user *to;
4638 union sctp_addr temp;
4639 struct sctp_sock *sp = sctp_sk(sk);
4640 int addrlen;
4641 size_t space_left;
4642 int bytes_copied;
4643
4644 if (len < sizeof(struct sctp_getaddrs))
4645 return -EINVAL;
4646
4647 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4648 return -EFAULT;
4649
4650 /* For UDP-style sockets, id specifies the association to query. */
4651 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4652 if (!asoc)
4653 return -EINVAL;
4654
4655 to = optval + offsetof(struct sctp_getaddrs,addrs);
Neil Horman186e2342007-06-18 19:59:16 -04004656 space_left = len - offsetof(struct sctp_getaddrs,addrs);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004657
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07004658 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4659 transports) {
Al Virob3f5b3b2006-11-20 17:22:43 -08004660 memcpy(&temp, &from->ipaddr, sizeof(temp));
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004661 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
Vlad Yasevicha5f4cea2010-04-30 21:42:42 -04004662 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004663 if (space_left < addrlen)
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004664 return -ENOMEM;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004665 if (copy_to_user(to, &temp, addrlen))
4666 return -EFAULT;
4667 to += addrlen;
4668 cnt++;
4669 space_left -= addrlen;
4670 }
4671
4672 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4673 return -EFAULT;
4674 bytes_copied = ((char __user *)to) - optval;
4675 if (put_user(bytes_copied, optlen))
4676 return -EFAULT;
4677
4678 return 0;
4679}
4680
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004681static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4682 size_t space_left, int *bytes_copied)
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004683{
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004684 struct sctp_sockaddr_entry *addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004685 union sctp_addr temp;
4686 int cnt = 0;
4687 int addrlen;
Eric W. Biederman4db67e82012-08-06 08:42:04 +00004688 struct net *net = sock_net(sk);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004689
Vlad Yasevich29303542007-09-16 16:02:12 -07004690 rcu_read_lock();
Eric W. Biederman4db67e82012-08-06 08:42:04 +00004691 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
Vlad Yasevich29303542007-09-16 16:02:12 -07004692 if (!addr->valid)
4693 continue;
4694
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004695 if ((PF_INET == sk->sk_family) &&
Al Viro6244be42006-11-20 17:21:44 -08004696 (AF_INET6 == addr->a.sa.sa_family))
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004697 continue;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07004698 if ((PF_INET6 == sk->sk_family) &&
4699 inet_v6_ipv6only(sk) &&
4700 (AF_INET == addr->a.sa.sa_family))
4701 continue;
Al Viro6244be42006-11-20 17:21:44 -08004702 memcpy(&temp, &addr->a, sizeof(temp));
Vlad Yasevichb46ae362008-01-28 14:25:36 -05004703 if (!temp.v4.sin_port)
4704 temp.v4.sin_port = htons(port);
4705
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004706 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4707 &temp);
4708 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
Vlad Yasevich29303542007-09-16 16:02:12 -07004709 if (space_left < addrlen) {
4710 cnt = -ENOMEM;
4711 break;
4712 }
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004713 memcpy(to, &temp, addrlen);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -08004714
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004715 to += addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004716 cnt ++;
4717 space_left -= addrlen;
Vlad Yasevich3663c302007-07-03 12:43:12 -04004718 *bytes_copied += addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004719 }
Vlad Yasevich29303542007-09-16 16:02:12 -07004720 rcu_read_unlock();
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004721
4722 return cnt;
4723}
4724
Linus Torvalds1da177e2005-04-16 15:20:36 -07004725
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004726static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4727 char __user *optval, int __user *optlen)
4728{
4729 struct sctp_bind_addr *bp;
4730 struct sctp_association *asoc;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004731 int cnt = 0;
4732 struct sctp_getaddrs getaddrs;
4733 struct sctp_sockaddr_entry *addr;
4734 void __user *to;
4735 union sctp_addr temp;
4736 struct sctp_sock *sp = sctp_sk(sk);
4737 int addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004738 int err = 0;
4739 size_t space_left;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004740 int bytes_copied = 0;
4741 void *addrs;
Vlad Yasevich70b57b82007-05-09 13:51:31 -07004742 void *buf;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004743
Neil Horman408f22e2007-06-16 14:03:45 -04004744 if (len < sizeof(struct sctp_getaddrs))
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004745 return -EINVAL;
4746
4747 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4748 return -EFAULT;
4749
4750 /*
4751 * For UDP-style sockets, id specifies the association to query.
4752 * If the id field is set to the value '0' then the locally bound
4753 * addresses are returned without regard to any particular
4754 * association.
4755 */
4756 if (0 == getaddrs.assoc_id) {
4757 bp = &sctp_sk(sk)->ep->base.bind_addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004758 } else {
4759 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4760 if (!asoc)
4761 return -EINVAL;
4762 bp = &asoc->base.bind_addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004763 }
4764
4765 to = optval + offsetof(struct sctp_getaddrs,addrs);
Neil Horman186e2342007-06-18 19:59:16 -04004766 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4767
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004768 addrs = kmalloc(space_left, GFP_KERNEL);
4769 if (!addrs)
4770 return -ENOMEM;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004771
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004772 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4773 * addresses from the global local address list.
4774 */
4775 if (sctp_list_single_entry(&bp->address_list)) {
4776 addr = list_entry(bp->address_list.next,
4777 struct sctp_sockaddr_entry, list);
Vlad Yasevich52cae8f2008-08-18 10:34:34 -04004778 if (sctp_is_any(sk, &addr->a)) {
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004779 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4780 space_left, &bytes_copied);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004781 if (cnt < 0) {
4782 err = cnt;
Vlad Yasevich559cf712007-09-16 16:03:28 -07004783 goto out;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004784 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004785 goto copy_getaddrs;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004786 }
4787 }
4788
Vlad Yasevich70b57b82007-05-09 13:51:31 -07004789 buf = addrs;
Vlad Yasevich559cf712007-09-16 16:03:28 -07004790 /* Protection on the bound address list is not needed since
4791 * in the socket option context we hold a socket lock and
4792 * thus the bound address list can't change.
4793 */
4794 list_for_each_entry(addr, &bp->address_list, list) {
Al Viro6244be42006-11-20 17:21:44 -08004795 memcpy(&temp, &addr->a, sizeof(temp));
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004796 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4797 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004798 if (space_left < addrlen) {
4799 err = -ENOMEM; /*fixme: right error?*/
Vlad Yasevich559cf712007-09-16 16:03:28 -07004800 goto out;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004801 }
Vlad Yasevich70b57b82007-05-09 13:51:31 -07004802 memcpy(buf, &temp, addrlen);
4803 buf += addrlen;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004804 bytes_copied += addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004805 cnt ++;
4806 space_left -= addrlen;
4807 }
4808
4809copy_getaddrs:
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004810 if (copy_to_user(to, addrs, bytes_copied)) {
4811 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02004812 goto out;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004813 }
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04004814 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4815 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02004816 goto out;
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04004817 }
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004818 if (put_user(bytes_copied, optlen))
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04004819 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02004820out:
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004821 kfree(addrs);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004822 return err;
4823}
4824
Linus Torvalds1da177e2005-04-16 15:20:36 -07004825/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4826 *
4827 * Requests that the local SCTP stack use the enclosed peer address as
4828 * the association primary. The enclosed address must be one of the
4829 * association peer's addresses.
4830 */
4831static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4832 char __user *optval, int __user *optlen)
4833{
4834 struct sctp_prim prim;
4835 struct sctp_association *asoc;
4836 struct sctp_sock *sp = sctp_sk(sk);
4837
Neil Horman408f22e2007-06-16 14:03:45 -04004838 if (len < sizeof(struct sctp_prim))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004839 return -EINVAL;
4840
Neil Horman408f22e2007-06-16 14:03:45 -04004841 len = sizeof(struct sctp_prim);
4842
4843 if (copy_from_user(&prim, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004844 return -EFAULT;
4845
4846 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4847 if (!asoc)
4848 return -EINVAL;
4849
4850 if (!asoc->peer.primary_path)
4851 return -ENOTCONN;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004852
Al Viro8cec6b82006-11-20 17:23:01 -08004853 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4854 asoc->peer.primary_path->af_specific->sockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004855
4856 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4857 (union sctp_addr *)&prim.ssp_addr);
4858
Neil Horman408f22e2007-06-16 14:03:45 -04004859 if (put_user(len, optlen))
4860 return -EFAULT;
4861 if (copy_to_user(optval, &prim, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004862 return -EFAULT;
4863
4864 return 0;
4865}
4866
4867/*
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004868 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004869 *
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004870 * Requests that the local endpoint set the specified Adaptation Layer
Linus Torvalds1da177e2005-04-16 15:20:36 -07004871 * Indication parameter for all future INIT and INIT-ACK exchanges.
4872 */
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004873static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004874 char __user *optval, int __user *optlen)
4875{
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004876 struct sctp_setadaptation adaptation;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004877
Neil Horman408f22e2007-06-16 14:03:45 -04004878 if (len < sizeof(struct sctp_setadaptation))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004879 return -EINVAL;
4880
Neil Horman408f22e2007-06-16 14:03:45 -04004881 len = sizeof(struct sctp_setadaptation);
4882
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004883 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
Neil Horman408f22e2007-06-16 14:03:45 -04004884
4885 if (put_user(len, optlen))
4886 return -EFAULT;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004887 if (copy_to_user(optval, &adaptation, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004888 return -EFAULT;
Ivan Skytte Jorgensena1ab3582005-10-28 15:33:24 -07004889
Linus Torvalds1da177e2005-04-16 15:20:36 -07004890 return 0;
4891}
4892
4893/*
4894 *
4895 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4896 *
4897 * Applications that wish to use the sendto() system call may wish to
4898 * specify a default set of parameters that would normally be supplied
4899 * through the inclusion of ancillary data. This socket option allows
4900 * such an application to set the default sctp_sndrcvinfo structure.
4901
4902
4903 * The application that wishes to use this socket option simply passes
4904 * in to this call the sctp_sndrcvinfo structure defined in Section
4905 * 5.2.2) The input parameters accepted by this call include
4906 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4907 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4908 * to this call if the caller is using the UDP model.
4909 *
4910 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4911 */
4912static int sctp_getsockopt_default_send_param(struct sock *sk,
4913 int len, char __user *optval,
4914 int __user *optlen)
4915{
4916 struct sctp_sndrcvinfo info;
4917 struct sctp_association *asoc;
4918 struct sctp_sock *sp = sctp_sk(sk);
4919
Neil Horman408f22e2007-06-16 14:03:45 -04004920 if (len < sizeof(struct sctp_sndrcvinfo))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004921 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004922
4923 len = sizeof(struct sctp_sndrcvinfo);
4924
4925 if (copy_from_user(&info, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004926 return -EFAULT;
4927
4928 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4929 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4930 return -EINVAL;
4931
4932 if (asoc) {
4933 info.sinfo_stream = asoc->default_stream;
4934 info.sinfo_flags = asoc->default_flags;
4935 info.sinfo_ppid = asoc->default_ppid;
4936 info.sinfo_context = asoc->default_context;
4937 info.sinfo_timetolive = asoc->default_timetolive;
4938 } else {
4939 info.sinfo_stream = sp->default_stream;
4940 info.sinfo_flags = sp->default_flags;
4941 info.sinfo_ppid = sp->default_ppid;
4942 info.sinfo_context = sp->default_context;
4943 info.sinfo_timetolive = sp->default_timetolive;
4944 }
4945
Neil Horman408f22e2007-06-16 14:03:45 -04004946 if (put_user(len, optlen))
4947 return -EFAULT;
4948 if (copy_to_user(optval, &info, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004949 return -EFAULT;
4950
4951 return 0;
4952}
4953
4954/*
4955 *
4956 * 7.1.5 SCTP_NODELAY
4957 *
4958 * Turn on/off any Nagle-like algorithm. This means that packets are
4959 * generally sent as soon as possible and no unnecessary delays are
4960 * introduced, at the cost of more packets in the network. Expects an
4961 * integer boolean flag.
4962 */
4963
4964static int sctp_getsockopt_nodelay(struct sock *sk, int len,
4965 char __user *optval, int __user *optlen)
4966{
4967 int val;
4968
4969 if (len < sizeof(int))
4970 return -EINVAL;
4971
4972 len = sizeof(int);
4973 val = (sctp_sk(sk)->nodelay == 1);
4974 if (put_user(len, optlen))
4975 return -EFAULT;
4976 if (copy_to_user(optval, &val, len))
4977 return -EFAULT;
4978 return 0;
4979}
4980
4981/*
4982 *
4983 * 7.1.1 SCTP_RTOINFO
4984 *
4985 * The protocol parameters used to initialize and bound retransmission
4986 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4987 * and modify these parameters.
4988 * All parameters are time values, in milliseconds. A value of 0, when
4989 * modifying the parameters, indicates that the current value should not
4990 * be changed.
4991 *
4992 */
4993static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
4994 char __user *optval,
4995 int __user *optlen) {
4996 struct sctp_rtoinfo rtoinfo;
4997 struct sctp_association *asoc;
4998
Neil Horman408f22e2007-06-16 14:03:45 -04004999 if (len < sizeof (struct sctp_rtoinfo))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005000 return -EINVAL;
5001
Neil Horman408f22e2007-06-16 14:03:45 -04005002 len = sizeof(struct sctp_rtoinfo);
5003
5004 if (copy_from_user(&rtoinfo, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005005 return -EFAULT;
5006
5007 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5008
5009 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5010 return -EINVAL;
5011
5012 /* Values corresponding to the specific association. */
5013 if (asoc) {
5014 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5015 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5016 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5017 } else {
5018 /* Values corresponding to the endpoint. */
5019 struct sctp_sock *sp = sctp_sk(sk);
5020
5021 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5022 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5023 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5024 }
5025
5026 if (put_user(len, optlen))
5027 return -EFAULT;
5028
5029 if (copy_to_user(optval, &rtoinfo, len))
5030 return -EFAULT;
5031
5032 return 0;
5033}
5034
5035/*
5036 *
5037 * 7.1.2 SCTP_ASSOCINFO
5038 *
Michael Opdenacker59c51592007-05-09 08:57:56 +02005039 * This option is used to tune the maximum retransmission attempts
Linus Torvalds1da177e2005-04-16 15:20:36 -07005040 * of the association.
5041 * Returns an error if the new association retransmission value is
5042 * greater than the sum of the retransmission value of the peer.
5043 * See [SCTP] for more information.
5044 *
5045 */
5046static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5047 char __user *optval,
5048 int __user *optlen)
5049{
5050
5051 struct sctp_assocparams assocparams;
5052 struct sctp_association *asoc;
5053 struct list_head *pos;
5054 int cnt = 0;
5055
Neil Horman408f22e2007-06-16 14:03:45 -04005056 if (len < sizeof (struct sctp_assocparams))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005057 return -EINVAL;
5058
Neil Horman408f22e2007-06-16 14:03:45 -04005059 len = sizeof(struct sctp_assocparams);
5060
5061 if (copy_from_user(&assocparams, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005062 return -EFAULT;
5063
5064 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5065
5066 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5067 return -EINVAL;
5068
5069 /* Values correspoinding to the specific association */
Vladislav Yasevich17337212005-04-28 11:57:54 -07005070 if (asoc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005071 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5072 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5073 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
Daniel Borkmann52db8822013-06-25 18:17:27 +02005074 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005075
5076 list_for_each(pos, &asoc->peer.transport_addr_list) {
5077 cnt ++;
5078 }
5079
5080 assocparams.sasoc_number_peer_destinations = cnt;
5081 } else {
5082 /* Values corresponding to the endpoint */
5083 struct sctp_sock *sp = sctp_sk(sk);
5084
5085 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5086 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5087 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5088 assocparams.sasoc_cookie_life =
5089 sp->assocparams.sasoc_cookie_life;
5090 assocparams.sasoc_number_peer_destinations =
5091 sp->assocparams.
5092 sasoc_number_peer_destinations;
5093 }
5094
5095 if (put_user(len, optlen))
5096 return -EFAULT;
5097
5098 if (copy_to_user(optval, &assocparams, len))
5099 return -EFAULT;
5100
5101 return 0;
5102}
5103
5104/*
5105 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5106 *
5107 * This socket option is a boolean flag which turns on or off mapped V4
5108 * addresses. If this option is turned on and the socket is type
5109 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5110 * If this option is turned off, then no mapping will be done of V4
5111 * addresses and a user will receive both PF_INET6 and PF_INET type
5112 * addresses on the socket.
5113 */
5114static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5115 char __user *optval, int __user *optlen)
5116{
5117 int val;
5118 struct sctp_sock *sp = sctp_sk(sk);
5119
5120 if (len < sizeof(int))
5121 return -EINVAL;
5122
5123 len = sizeof(int);
5124 val = sp->v4mapped;
5125 if (put_user(len, optlen))
5126 return -EFAULT;
5127 if (copy_to_user(optval, &val, len))
5128 return -EFAULT;
5129
5130 return 0;
5131}
5132
5133/*
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005134 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5135 * (chapter and verse is quoted at sctp_setsockopt_context())
5136 */
5137static int sctp_getsockopt_context(struct sock *sk, int len,
5138 char __user *optval, int __user *optlen)
5139{
5140 struct sctp_assoc_value params;
5141 struct sctp_sock *sp;
5142 struct sctp_association *asoc;
5143
Neil Horman408f22e2007-06-16 14:03:45 -04005144 if (len < sizeof(struct sctp_assoc_value))
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005145 return -EINVAL;
5146
Neil Horman408f22e2007-06-16 14:03:45 -04005147 len = sizeof(struct sctp_assoc_value);
5148
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005149 if (copy_from_user(&params, optval, len))
5150 return -EFAULT;
5151
5152 sp = sctp_sk(sk);
5153
5154 if (params.assoc_id != 0) {
5155 asoc = sctp_id2assoc(sk, params.assoc_id);
5156 if (!asoc)
5157 return -EINVAL;
5158 params.assoc_value = asoc->default_rcv_context;
5159 } else {
5160 params.assoc_value = sp->default_rcv_context;
5161 }
5162
5163 if (put_user(len, optlen))
5164 return -EFAULT;
5165 if (copy_to_user(optval, &params, len))
5166 return -EFAULT;
5167
5168 return 0;
5169}
5170
5171/*
Wei Yongjune89c2092008-12-25 16:54:58 -08005172 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5173 * This option will get or set the maximum size to put in any outgoing
5174 * SCTP DATA chunk. If a message is larger than this size it will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07005175 * fragmented by SCTP into the specified size. Note that the underlying
5176 * SCTP implementation may fragment into smaller sized chunks when the
5177 * PMTU of the underlying association is smaller than the value set by
Wei Yongjune89c2092008-12-25 16:54:58 -08005178 * the user. The default value for this option is '0' which indicates
5179 * the user is NOT limiting fragmentation and only the PMTU will effect
5180 * SCTP's choice of DATA chunk size. Note also that values set larger
5181 * than the maximum size of an IP datagram will effectively let SCTP
5182 * control fragmentation (i.e. the same as setting this option to 0).
5183 *
5184 * The following structure is used to access and modify this parameter:
5185 *
5186 * struct sctp_assoc_value {
5187 * sctp_assoc_t assoc_id;
5188 * uint32_t assoc_value;
5189 * };
5190 *
5191 * assoc_id: This parameter is ignored for one-to-one style sockets.
5192 * For one-to-many style sockets this parameter indicates which
5193 * association the user is performing an action upon. Note that if
5194 * this field's value is zero then the endpoints default value is
5195 * changed (effecting future associations only).
5196 * assoc_value: This parameter specifies the maximum size in bytes.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005197 */
5198static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5199 char __user *optval, int __user *optlen)
5200{
Wei Yongjune89c2092008-12-25 16:54:58 -08005201 struct sctp_assoc_value params;
5202 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005203
Wei Yongjune89c2092008-12-25 16:54:58 -08005204 if (len == sizeof(int)) {
Joe Perches145ce502010-08-24 13:21:08 +00005205 pr_warn("Use of int in maxseg socket option deprecated\n");
5206 pr_warn("Use struct sctp_assoc_value instead\n");
Wei Yongjune89c2092008-12-25 16:54:58 -08005207 params.assoc_id = 0;
5208 } else if (len >= sizeof(struct sctp_assoc_value)) {
5209 len = sizeof(struct sctp_assoc_value);
5210 if (copy_from_user(&params, optval, sizeof(params)))
5211 return -EFAULT;
5212 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07005213 return -EINVAL;
5214
Wei Yongjune89c2092008-12-25 16:54:58 -08005215 asoc = sctp_id2assoc(sk, params.assoc_id);
5216 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5217 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005218
Wei Yongjune89c2092008-12-25 16:54:58 -08005219 if (asoc)
5220 params.assoc_value = asoc->frag_point;
5221 else
5222 params.assoc_value = sctp_sk(sk)->user_frag;
5223
Linus Torvalds1da177e2005-04-16 15:20:36 -07005224 if (put_user(len, optlen))
5225 return -EFAULT;
Wei Yongjune89c2092008-12-25 16:54:58 -08005226 if (len == sizeof(int)) {
5227 if (copy_to_user(optval, &params.assoc_value, len))
5228 return -EFAULT;
5229 } else {
5230 if (copy_to_user(optval, &params, len))
5231 return -EFAULT;
5232 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005233
5234 return 0;
5235}
5236
Vlad Yasevichb6e13312007-04-20 12:23:15 -07005237/*
5238 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5239 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5240 */
5241static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5242 char __user *optval, int __user *optlen)
5243{
5244 int val;
5245
5246 if (len < sizeof(int))
5247 return -EINVAL;
5248
5249 len = sizeof(int);
5250
5251 val = sctp_sk(sk)->frag_interleave;
5252 if (put_user(len, optlen))
5253 return -EFAULT;
5254 if (copy_to_user(optval, &val, len))
5255 return -EFAULT;
5256
5257 return 0;
5258}
5259
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005260/*
5261 * 7.1.25. Set or Get the sctp partial delivery point
5262 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5263 */
5264static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5265 char __user *optval,
5266 int __user *optlen)
5267{
YOSHIFUJI Hideaki9cbcbf42007-07-19 10:44:50 +09005268 u32 val;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005269
5270 if (len < sizeof(u32))
5271 return -EINVAL;
5272
5273 len = sizeof(u32);
5274
5275 val = sctp_sk(sk)->pd_point;
5276 if (put_user(len, optlen))
5277 return -EFAULT;
5278 if (copy_to_user(optval, &val, len))
5279 return -EFAULT;
5280
Wei Yongjun7d743b72010-12-14 16:10:41 +00005281 return 0;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005282}
5283
Vlad Yasevich70331572007-03-23 11:34:36 -07005284/*
5285 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5286 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5287 */
5288static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5289 char __user *optval,
5290 int __user *optlen)
5291{
Neil Horman219b99a2008-03-05 13:44:46 -08005292 struct sctp_assoc_value params;
5293 struct sctp_sock *sp;
5294 struct sctp_association *asoc;
Vlad Yasevich70331572007-03-23 11:34:36 -07005295
Neil Horman219b99a2008-03-05 13:44:46 -08005296 if (len == sizeof(int)) {
Joe Perches145ce502010-08-24 13:21:08 +00005297 pr_warn("Use of int in max_burst socket option deprecated\n");
5298 pr_warn("Use struct sctp_assoc_value instead\n");
Neil Horman219b99a2008-03-05 13:44:46 -08005299 params.assoc_id = 0;
Wei Yongjunc6db93a2009-03-02 09:46:12 +00005300 } else if (len >= sizeof(struct sctp_assoc_value)) {
5301 len = sizeof(struct sctp_assoc_value);
Neil Horman219b99a2008-03-05 13:44:46 -08005302 if (copy_from_user(&params, optval, len))
5303 return -EFAULT;
5304 } else
5305 return -EINVAL;
Vlad Yasevich70331572007-03-23 11:34:36 -07005306
Neil Horman219b99a2008-03-05 13:44:46 -08005307 sp = sctp_sk(sk);
Vlad Yasevich70331572007-03-23 11:34:36 -07005308
Neil Horman219b99a2008-03-05 13:44:46 -08005309 if (params.assoc_id != 0) {
5310 asoc = sctp_id2assoc(sk, params.assoc_id);
5311 if (!asoc)
5312 return -EINVAL;
5313 params.assoc_value = asoc->max_burst;
5314 } else
5315 params.assoc_value = sp->max_burst;
5316
5317 if (len == sizeof(int)) {
5318 if (copy_to_user(optval, &params.assoc_value, len))
5319 return -EFAULT;
5320 } else {
5321 if (copy_to_user(optval, &params, len))
5322 return -EFAULT;
5323 }
5324
5325 return 0;
5326
Vlad Yasevich70331572007-03-23 11:34:36 -07005327}
5328
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005329static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5330 char __user *optval, int __user *optlen)
5331{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005332 struct net *net = sock_net(sk);
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005333 struct sctp_hmacalgo __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005334 struct sctp_hmac_algo_param *hmacs;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005335 __u16 data_len = 0;
5336 u32 num_idents;
5337
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005338 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005339 return -EACCES;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005340
5341 hmacs = sctp_sk(sk)->ep->auth_hmacs_list;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005342 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005343
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005344 if (len < sizeof(struct sctp_hmacalgo) + data_len)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005345 return -EINVAL;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005346
5347 len = sizeof(struct sctp_hmacalgo) + data_len;
5348 num_idents = data_len / sizeof(u16);
5349
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005350 if (put_user(len, optlen))
5351 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005352 if (put_user(num_idents, &p->shmac_num_idents))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005353 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005354 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5355 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005356 return 0;
5357}
5358
5359static int sctp_getsockopt_active_key(struct sock *sk, int len,
5360 char __user *optval, int __user *optlen)
5361{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005362 struct net *net = sock_net(sk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005363 struct sctp_authkeyid val;
5364 struct sctp_association *asoc;
5365
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005366 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005367 return -EACCES;
5368
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005369 if (len < sizeof(struct sctp_authkeyid))
5370 return -EINVAL;
5371 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5372 return -EFAULT;
5373
5374 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5375 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5376 return -EINVAL;
5377
5378 if (asoc)
5379 val.scact_keynumber = asoc->active_key_id;
5380 else
5381 val.scact_keynumber = sctp_sk(sk)->ep->active_key_id;
5382
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005383 len = sizeof(struct sctp_authkeyid);
5384 if (put_user(len, optlen))
5385 return -EFAULT;
5386 if (copy_to_user(optval, &val, len))
5387 return -EFAULT;
5388
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005389 return 0;
5390}
5391
5392static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5393 char __user *optval, int __user *optlen)
5394{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005395 struct net *net = sock_net(sk);
Al Viro411223c2007-10-14 19:21:20 +01005396 struct sctp_authchunks __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005397 struct sctp_authchunks val;
5398 struct sctp_association *asoc;
5399 struct sctp_chunks_param *ch;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005400 u32 num_chunks = 0;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005401 char __user *to;
5402
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005403 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005404 return -EACCES;
5405
5406 if (len < sizeof(struct sctp_authchunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005407 return -EINVAL;
5408
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005409 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005410 return -EFAULT;
5411
Al Viro411223c2007-10-14 19:21:20 +01005412 to = p->gauth_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005413 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5414 if (!asoc)
5415 return -EINVAL;
5416
5417 ch = asoc->peer.peer_chunks;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005418 if (!ch)
5419 goto num;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005420
5421 /* See if the user provided enough room for all the data */
Vlad Yasevichb40db682008-02-27 14:40:37 -05005422 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5423 if (len < num_chunks)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005424 return -EINVAL;
5425
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005426 if (copy_to_user(to, ch->chunks, num_chunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005427 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005428num:
5429 len = sizeof(struct sctp_authchunks) + num_chunks;
5430 if (put_user(len, optlen)) return -EFAULT;
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05005431 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5432 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005433 return 0;
5434}
5435
5436static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5437 char __user *optval, int __user *optlen)
5438{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005439 struct net *net = sock_net(sk);
Al Viro411223c2007-10-14 19:21:20 +01005440 struct sctp_authchunks __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005441 struct sctp_authchunks val;
5442 struct sctp_association *asoc;
5443 struct sctp_chunks_param *ch;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005444 u32 num_chunks = 0;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005445 char __user *to;
5446
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005447 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005448 return -EACCES;
5449
5450 if (len < sizeof(struct sctp_authchunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005451 return -EINVAL;
5452
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005453 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005454 return -EFAULT;
5455
Al Viro411223c2007-10-14 19:21:20 +01005456 to = p->gauth_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005457 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5458 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5459 return -EINVAL;
5460
5461 if (asoc)
5462 ch = (struct sctp_chunks_param*)asoc->c.auth_chunks;
5463 else
5464 ch = sctp_sk(sk)->ep->auth_chunk_list;
5465
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005466 if (!ch)
5467 goto num;
5468
Vlad Yasevichb40db682008-02-27 14:40:37 -05005469 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005470 if (len < sizeof(struct sctp_authchunks) + num_chunks)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005471 return -EINVAL;
5472
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005473 if (copy_to_user(to, ch->chunks, num_chunks))
5474 return -EFAULT;
5475num:
5476 len = sizeof(struct sctp_authchunks) + num_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005477 if (put_user(len, optlen))
5478 return -EFAULT;
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05005479 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5480 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005481
5482 return 0;
5483}
5484
Wei Yongjunaea3c5c2008-12-25 16:57:24 -08005485/*
5486 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5487 * This option gets the current number of associations that are attached
5488 * to a one-to-many style socket. The option value is an uint32_t.
5489 */
5490static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5491 char __user *optval, int __user *optlen)
5492{
5493 struct sctp_sock *sp = sctp_sk(sk);
5494 struct sctp_association *asoc;
5495 u32 val = 0;
5496
5497 if (sctp_style(sk, TCP))
5498 return -EOPNOTSUPP;
5499
5500 if (len < sizeof(u32))
5501 return -EINVAL;
5502
5503 len = sizeof(u32);
5504
5505 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5506 val++;
5507 }
5508
5509 if (put_user(len, optlen))
5510 return -EFAULT;
5511 if (copy_to_user(optval, &val, len))
5512 return -EFAULT;
5513
5514 return 0;
5515}
5516
Wei Yongjun209ba422011-04-17 17:27:08 +00005517/*
Michio Honda7dc04d72011-04-26 20:16:31 +09005518 * 8.1.23 SCTP_AUTO_ASCONF
5519 * See the corresponding setsockopt entry as description
5520 */
5521static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5522 char __user *optval, int __user *optlen)
5523{
5524 int val = 0;
5525
5526 if (len < sizeof(int))
5527 return -EINVAL;
5528
5529 len = sizeof(int);
5530 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5531 val = 1;
5532 if (put_user(len, optlen))
5533 return -EFAULT;
5534 if (copy_to_user(optval, &val, len))
5535 return -EFAULT;
5536 return 0;
5537}
5538
5539/*
Wei Yongjun209ba422011-04-17 17:27:08 +00005540 * 8.2.6. Get the Current Identifiers of Associations
5541 * (SCTP_GET_ASSOC_ID_LIST)
5542 *
5543 * This option gets the current list of SCTP association identifiers of
5544 * the SCTP associations handled by a one-to-many style socket.
5545 */
5546static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5547 char __user *optval, int __user *optlen)
5548{
5549 struct sctp_sock *sp = sctp_sk(sk);
5550 struct sctp_association *asoc;
5551 struct sctp_assoc_ids *ids;
5552 u32 num = 0;
5553
5554 if (sctp_style(sk, TCP))
5555 return -EOPNOTSUPP;
5556
5557 if (len < sizeof(struct sctp_assoc_ids))
5558 return -EINVAL;
5559
5560 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5561 num++;
5562 }
5563
5564 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5565 return -EINVAL;
5566
5567 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5568
5569 ids = kmalloc(len, GFP_KERNEL);
5570 if (unlikely(!ids))
5571 return -ENOMEM;
5572
5573 ids->gaids_number_of_ids = num;
5574 num = 0;
5575 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5576 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5577 }
5578
5579 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5580 kfree(ids);
5581 return -EFAULT;
5582 }
5583
5584 kfree(ids);
5585 return 0;
5586}
5587
Neil Horman5aa93bc2012-07-21 07:56:07 +00005588/*
5589 * SCTP_PEER_ADDR_THLDS
5590 *
5591 * This option allows us to fetch the partially failed threshold for one or all
5592 * transports in an association. See Section 6.1 of:
5593 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5594 */
5595static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
5596 char __user *optval,
5597 int len,
5598 int __user *optlen)
5599{
5600 struct sctp_paddrthlds val;
5601 struct sctp_transport *trans;
5602 struct sctp_association *asoc;
5603
5604 if (len < sizeof(struct sctp_paddrthlds))
5605 return -EINVAL;
5606 len = sizeof(struct sctp_paddrthlds);
5607 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
5608 return -EFAULT;
5609
5610 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
5611 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
5612 if (!asoc)
5613 return -ENOENT;
5614
5615 val.spt_pathpfthld = asoc->pf_retrans;
5616 val.spt_pathmaxrxt = asoc->pathmaxrxt;
5617 } else {
5618 trans = sctp_addr_id2transport(sk, &val.spt_address,
5619 val.spt_assoc_id);
5620 if (!trans)
5621 return -ENOENT;
5622
5623 val.spt_pathmaxrxt = trans->pathmaxrxt;
5624 val.spt_pathpfthld = trans->pf_retrans;
5625 }
5626
5627 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
5628 return -EFAULT;
5629
5630 return 0;
5631}
5632
Michele Baldessari196d6752012-12-01 04:49:42 +00005633/*
5634 * SCTP_GET_ASSOC_STATS
5635 *
5636 * This option retrieves local per endpoint statistics. It is modeled
5637 * after OpenSolaris' implementation
5638 */
5639static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
5640 char __user *optval,
5641 int __user *optlen)
5642{
5643 struct sctp_assoc_stats sas;
5644 struct sctp_association *asoc = NULL;
5645
5646 /* User must provide at least the assoc id */
5647 if (len < sizeof(sctp_assoc_t))
5648 return -EINVAL;
5649
Guenter Roeck726bc6b2013-02-27 10:57:31 +00005650 /* Allow the struct to grow and fill in as much as possible */
5651 len = min_t(size_t, len, sizeof(sas));
5652
Michele Baldessari196d6752012-12-01 04:49:42 +00005653 if (copy_from_user(&sas, optval, len))
5654 return -EFAULT;
5655
5656 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
5657 if (!asoc)
5658 return -EINVAL;
5659
5660 sas.sas_rtxchunks = asoc->stats.rtxchunks;
5661 sas.sas_gapcnt = asoc->stats.gapcnt;
5662 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
5663 sas.sas_osacks = asoc->stats.osacks;
5664 sas.sas_isacks = asoc->stats.isacks;
5665 sas.sas_octrlchunks = asoc->stats.octrlchunks;
5666 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
5667 sas.sas_oodchunks = asoc->stats.oodchunks;
5668 sas.sas_iodchunks = asoc->stats.iodchunks;
5669 sas.sas_ouodchunks = asoc->stats.ouodchunks;
5670 sas.sas_iuodchunks = asoc->stats.iuodchunks;
5671 sas.sas_idupchunks = asoc->stats.idupchunks;
5672 sas.sas_opackets = asoc->stats.opackets;
5673 sas.sas_ipackets = asoc->stats.ipackets;
5674
5675 /* New high max rto observed, will return 0 if not a single
5676 * RTO update took place. obs_rto_ipaddr will be bogus
5677 * in such a case
5678 */
5679 sas.sas_maxrto = asoc->stats.max_obs_rto;
5680 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
5681 sizeof(struct sockaddr_storage));
5682
5683 /* Mark beginning of a new observation period */
5684 asoc->stats.max_obs_rto = asoc->rto_min;
5685
Michele Baldessari196d6752012-12-01 04:49:42 +00005686 if (put_user(len, optlen))
5687 return -EFAULT;
5688
Daniel Borkmannbb333812013-06-28 19:49:40 +02005689 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
Michele Baldessari196d6752012-12-01 04:49:42 +00005690
5691 if (copy_to_user(optval, &sas, len))
5692 return -EFAULT;
5693
5694 return 0;
5695}
5696
Daniel Borkmanndda91922013-06-17 11:40:05 +02005697static int sctp_getsockopt(struct sock *sk, int level, int optname,
5698 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005699{
5700 int retval = 0;
5701 int len;
5702
Daniel Borkmannbb333812013-06-28 19:49:40 +02005703 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005704
5705 /* I can hardly begin to describe how wrong this is. This is
5706 * so broken as to be worse than useless. The API draft
5707 * REALLY is NOT helpful here... I am not convinced that the
5708 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5709 * are at all well-founded.
5710 */
5711 if (level != SOL_SCTP) {
5712 struct sctp_af *af = sctp_sk(sk)->pf->af;
5713
5714 retval = af->getsockopt(sk, level, optname, optval, optlen);
5715 return retval;
5716 }
5717
5718 if (get_user(len, optlen))
5719 return -EFAULT;
5720
5721 sctp_lock_sock(sk);
5722
5723 switch (optname) {
5724 case SCTP_STATUS:
5725 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5726 break;
5727 case SCTP_DISABLE_FRAGMENTS:
5728 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5729 optlen);
5730 break;
5731 case SCTP_EVENTS:
5732 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5733 break;
5734 case SCTP_AUTOCLOSE:
5735 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5736 break;
5737 case SCTP_SOCKOPT_PEELOFF:
5738 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5739 break;
5740 case SCTP_PEER_ADDR_PARAMS:
5741 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5742 optlen);
5743 break;
Shan Wei4580ccc2011-01-18 22:39:00 +00005744 case SCTP_DELAYED_SACK:
Wei Yongjund364d922008-05-09 15:13:26 -07005745 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
Frank Filz77086102005-12-22 11:37:30 -08005746 optlen);
5747 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005748 case SCTP_INITMSG:
5749 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
5750 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005751 case SCTP_GET_PEER_ADDRS:
5752 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
5753 optlen);
5754 break;
5755 case SCTP_GET_LOCAL_ADDRS:
5756 retval = sctp_getsockopt_local_addrs(sk, len, optval,
5757 optlen);
5758 break;
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04005759 case SCTP_SOCKOPT_CONNECTX3:
5760 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
5761 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005762 case SCTP_DEFAULT_SEND_PARAM:
5763 retval = sctp_getsockopt_default_send_param(sk, len,
5764 optval, optlen);
5765 break;
5766 case SCTP_PRIMARY_ADDR:
5767 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
5768 break;
5769 case SCTP_NODELAY:
5770 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
5771 break;
5772 case SCTP_RTOINFO:
5773 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
5774 break;
5775 case SCTP_ASSOCINFO:
5776 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
5777 break;
5778 case SCTP_I_WANT_MAPPED_V4_ADDR:
5779 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
5780 break;
5781 case SCTP_MAXSEG:
5782 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
5783 break;
5784 case SCTP_GET_PEER_ADDR_INFO:
5785 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
5786 optlen);
5787 break;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08005788 case SCTP_ADAPTATION_LAYER:
5789 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005790 optlen);
5791 break;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005792 case SCTP_CONTEXT:
5793 retval = sctp_getsockopt_context(sk, len, optval, optlen);
5794 break;
Vlad Yasevichb6e13312007-04-20 12:23:15 -07005795 case SCTP_FRAGMENT_INTERLEAVE:
5796 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
5797 optlen);
5798 break;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005799 case SCTP_PARTIAL_DELIVERY_POINT:
5800 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
5801 optlen);
5802 break;
Vlad Yasevich70331572007-03-23 11:34:36 -07005803 case SCTP_MAX_BURST:
5804 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
5805 break;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005806 case SCTP_AUTH_KEY:
5807 case SCTP_AUTH_CHUNK:
5808 case SCTP_AUTH_DELETE_KEY:
5809 retval = -EOPNOTSUPP;
5810 break;
5811 case SCTP_HMAC_IDENT:
5812 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
5813 break;
5814 case SCTP_AUTH_ACTIVE_KEY:
5815 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
5816 break;
5817 case SCTP_PEER_AUTH_CHUNKS:
5818 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
5819 optlen);
5820 break;
5821 case SCTP_LOCAL_AUTH_CHUNKS:
5822 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
5823 optlen);
5824 break;
Wei Yongjunaea3c5c2008-12-25 16:57:24 -08005825 case SCTP_GET_ASSOC_NUMBER:
5826 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
5827 break;
Wei Yongjun209ba422011-04-17 17:27:08 +00005828 case SCTP_GET_ASSOC_ID_LIST:
5829 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
5830 break;
Michio Honda7dc04d72011-04-26 20:16:31 +09005831 case SCTP_AUTO_ASCONF:
5832 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
5833 break;
Neil Horman5aa93bc2012-07-21 07:56:07 +00005834 case SCTP_PEER_ADDR_THLDS:
5835 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
5836 break;
Michele Baldessari196d6752012-12-01 04:49:42 +00005837 case SCTP_GET_ASSOC_STATS:
5838 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
5839 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005840 default:
5841 retval = -ENOPROTOOPT;
5842 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07005843 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005844
5845 sctp_release_sock(sk);
5846 return retval;
5847}
5848
5849static void sctp_hash(struct sock *sk)
5850{
5851 /* STUB */
5852}
5853
5854static void sctp_unhash(struct sock *sk)
5855{
5856 /* STUB */
5857}
5858
5859/* Check if port is acceptable. Possibly find first available port.
5860 *
5861 * The port hash table (contained in the 'global' SCTP protocol storage
5862 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5863 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5864 * list (the list number is the port number hashed out, so as you
5865 * would expect from a hash function, all the ports in a given list have
5866 * such a number that hashes out to the same list number; you were
5867 * expecting that, right?); so each list has a set of ports, with a
5868 * link to the socket (struct sock) that uses it, the port number and
5869 * a fastreuse flag (FIXME: NPI ipg).
5870 */
5871static struct sctp_bind_bucket *sctp_bucket_create(
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005872 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005873
5874static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
5875{
5876 struct sctp_bind_hashbucket *head; /* hash list */
Sasha Levinb67bfe02013-02-27 17:06:00 -08005877 struct sctp_bind_bucket *pp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005878 unsigned short snum;
5879 int ret;
5880
Al Viro04afd8b2006-11-20 17:02:01 -08005881 snum = ntohs(addr->v4.sin_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005882
Daniel Borkmannbb333812013-06-28 19:49:40 +02005883 pr_debug("%s: begins, snum:%d\n", __func__, snum);
5884
Linus Torvalds1da177e2005-04-16 15:20:36 -07005885 sctp_local_bh_disable();
5886
5887 if (snum == 0) {
Stephen Hemminger06393002007-10-10 17:30:18 -07005888 /* Search for an available port. */
Stephen Hemminger227b60f2007-10-10 17:30:46 -07005889 int low, high, remaining, index;
5890 unsigned int rover;
5891
Eric W. Biederman0bbf87d2013-09-28 14:10:59 -07005892 inet_get_local_port_range(sock_net(sk), &low, &high);
Stephen Hemminger227b60f2007-10-10 17:30:46 -07005893 remaining = (high - low) + 1;
5894 rover = net_random() % remaining + low;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005895
Linus Torvalds1da177e2005-04-16 15:20:36 -07005896 do {
5897 rover++;
5898 if ((rover < low) || (rover > high))
5899 rover = low;
Amerigo Wange3826f12010-05-05 00:27:06 +00005900 if (inet_is_reserved_local_port(rover))
5901 continue;
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005902 index = sctp_phashfn(sock_net(sk), rover);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005903 head = &sctp_port_hashtable[index];
5904 sctp_spin_lock(&head->lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08005905 sctp_for_each_hentry(pp, &head->chain)
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005906 if ((pp->port == rover) &&
5907 net_eq(sock_net(sk), pp->net))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005908 goto next;
5909 break;
5910 next:
5911 sctp_spin_unlock(&head->lock);
5912 } while (--remaining > 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005913
5914 /* Exhausted local port range during search? */
5915 ret = 1;
5916 if (remaining <= 0)
5917 goto fail;
5918
5919 /* OK, here is the one we will use. HEAD (the port
5920 * hash table list entry) is non-NULL and we hold it's
5921 * mutex.
5922 */
5923 snum = rover;
5924 } else {
5925 /* We are given an specific port number; we verify
5926 * that it is not being used. If it is used, we will
5927 * exahust the search in the hash list corresponding
5928 * to the port number (snum) - we detect that with the
5929 * port iterator, pp being NULL.
5930 */
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005931 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07005932 sctp_spin_lock(&head->lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08005933 sctp_for_each_hentry(pp, &head->chain) {
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005934 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005935 goto pp_found;
5936 }
5937 }
5938 pp = NULL;
5939 goto pp_not_found;
5940pp_found:
5941 if (!hlist_empty(&pp->owner)) {
5942 /* We had a port hash table hit - there is an
5943 * available port (pp != NULL) and it is being
5944 * used by other socket (pp->owner not empty); that other
5945 * socket is going to be sk2.
5946 */
5947 int reuse = sk->sk_reuse;
5948 struct sock *sk2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005949
Daniel Borkmannbb333812013-06-28 19:49:40 +02005950 pr_debug("%s: found a possible match\n", __func__);
5951
Vlad Yasevichce5325c2007-05-04 13:34:49 -07005952 if (pp->fastreuse && sk->sk_reuse &&
5953 sk->sk_state != SCTP_SS_LISTENING)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005954 goto success;
5955
5956 /* Run through the list of sockets bound to the port
5957 * (pp->port) [via the pointers bind_next and
5958 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5959 * we get the endpoint they describe and run through
5960 * the endpoint's list of IP (v4 or v6) addresses,
5961 * comparing each of the addresses with the address of
5962 * the socket sk. If we find a match, then that means
5963 * that this port/socket (sk) combination are already
5964 * in an endpoint.
5965 */
Sasha Levinb67bfe02013-02-27 17:06:00 -08005966 sk_for_each_bound(sk2, &pp->owner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005967 struct sctp_endpoint *ep2;
5968 ep2 = sctp_sk(sk2)->ep;
5969
Vlad Yasevich4e540642008-07-18 23:06:32 -07005970 if (sk == sk2 ||
5971 (reuse && sk2->sk_reuse &&
5972 sk2->sk_state != SCTP_SS_LISTENING))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005973 continue;
5974
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07005975 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
5976 sctp_sk(sk2), sctp_sk(sk))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005977 ret = (long)sk2;
5978 goto fail_unlock;
5979 }
5980 }
Daniel Borkmannbb333812013-06-28 19:49:40 +02005981
5982 pr_debug("%s: found a match\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005983 }
5984pp_not_found:
5985 /* If there was a hash table miss, create a new port. */
5986 ret = 1;
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005987 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005988 goto fail_unlock;
5989
5990 /* In either case (hit or miss), make sure fastreuse is 1 only
5991 * if sk->sk_reuse is too (that is, if the caller requested
5992 * SO_REUSEADDR on this socket -sk-).
5993 */
Vlad Yasevichce5325c2007-05-04 13:34:49 -07005994 if (hlist_empty(&pp->owner)) {
5995 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
5996 pp->fastreuse = 1;
5997 else
5998 pp->fastreuse = 0;
5999 } else if (pp->fastreuse &&
6000 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006001 pp->fastreuse = 0;
6002
6003 /* We are set, so fill up all the data in the hash table
6004 * entry, tie the socket list information with the rest of the
6005 * sockets FIXME: Blurry, NPI (ipg).
6006 */
6007success:
Linus Torvalds1da177e2005-04-16 15:20:36 -07006008 if (!sctp_sk(sk)->bind_hash) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006009 inet_sk(sk)->inet_num = snum;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006010 sk_add_bind_node(sk, &pp->owner);
6011 sctp_sk(sk)->bind_hash = pp;
6012 }
6013 ret = 0;
6014
6015fail_unlock:
6016 sctp_spin_unlock(&head->lock);
6017
6018fail:
6019 sctp_local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006020 return ret;
6021}
6022
6023/* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6024 * port is requested.
6025 */
6026static int sctp_get_port(struct sock *sk, unsigned short snum)
6027{
Linus Torvalds1da177e2005-04-16 15:20:36 -07006028 union sctp_addr addr;
6029 struct sctp_af *af = sctp_sk(sk)->pf->af;
6030
6031 /* Set up a dummy address struct from the sk. */
6032 af->from_sk(&addr, sk);
6033 addr.v4.sin_port = htons(snum);
6034
6035 /* Note: sk->sk_num gets filled in if ephemeral port request. */
Daniel Borkmann62208f12013-06-25 18:17:30 +02006036 return !!sctp_get_port_local(sk, &addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006037}
6038
6039/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07006040 * Move a socket to LISTENING state.
6041 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02006042static int sctp_listen_start(struct sock *sk, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006043{
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006044 struct sctp_sock *sp = sctp_sk(sk);
6045 struct sctp_endpoint *ep = sp->ep;
Herbert Xu1b489e12006-08-20 15:07:14 +10006046 struct crypto_hash *tfm = NULL;
Neil Horman3c681982012-10-24 09:20:03 +00006047 char alg[32];
Linus Torvalds1da177e2005-04-16 15:20:36 -07006048
6049 /* Allocate HMAC for generating cookie. */
Neil Horman3c681982012-10-24 09:20:03 +00006050 if (!sp->hmac && sp->sctp_hmac_alg) {
6051 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
6052 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
Vlad Yasevich8dc49842007-05-09 13:50:20 -07006053 if (IS_ERR(tfm)) {
Joe Perchese87cc472012-05-13 21:56:26 +00006054 net_info_ratelimited("failed to load transform for %s: %ld\n",
Neil Horman3c681982012-10-24 09:20:03 +00006055 sp->sctp_hmac_alg, PTR_ERR(tfm));
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006056 return -ENOSYS;
6057 }
6058 sctp_sk(sk)->hmac = tfm;
6059 }
6060
6061 /*
6062 * If a bind() or sctp_bindx() is not called prior to a listen()
6063 * call that allows new associations to be accepted, the system
6064 * picks an ephemeral port and will choose an address set equivalent
6065 * to binding with a wildcard address.
6066 *
6067 * This is not currently spelled out in the SCTP sockets
6068 * extensions draft, but follows the practice as seen in TCP
6069 * sockets.
6070 *
6071 */
6072 sk->sk_state = SCTP_SS_LISTENING;
6073 if (!ep->base.bind_addr.port) {
6074 if (sctp_autobind(sk))
6075 return -EAGAIN;
6076 } else {
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006077 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006078 sk->sk_state = SCTP_SS_CLOSED;
6079 return -EADDRINUSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006080 }
6081 }
6082
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006083 sk->sk_max_ack_backlog = backlog;
6084 sctp_hash_endpoint(ep);
6085 return 0;
6086}
6087
6088/*
6089 * 4.1.3 / 5.1.3 listen()
6090 *
6091 * By default, new associations are not accepted for UDP style sockets.
6092 * An application uses listen() to mark a socket as being able to
6093 * accept new associations.
6094 *
6095 * On TCP style sockets, applications use listen() to ready the SCTP
6096 * endpoint for accepting inbound associations.
6097 *
6098 * On both types of endpoints a backlog of '0' disables listening.
6099 *
6100 * Move a socket to LISTENING state.
6101 */
6102int sctp_inet_listen(struct socket *sock, int backlog)
6103{
6104 struct sock *sk = sock->sk;
6105 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6106 int err = -EINVAL;
6107
6108 if (unlikely(backlog < 0))
6109 return err;
6110
6111 sctp_lock_sock(sk);
6112
6113 /* Peeled-off sockets are not allowed to listen(). */
6114 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
6115 goto out;
6116
6117 if (sock->state != SS_UNCONNECTED)
6118 goto out;
6119
6120 /* If backlog is zero, disable listening. */
6121 if (!backlog) {
6122 if (sctp_sstate(sk, CLOSED))
6123 goto out;
6124
6125 err = 0;
6126 sctp_unhash_endpoint(ep);
6127 sk->sk_state = SCTP_SS_CLOSED;
6128 if (sk->sk_reuse)
6129 sctp_sk(sk)->bind_hash->fastreuse = 1;
6130 goto out;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07006131 }
6132
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006133 /* If we are already listening, just update the backlog */
6134 if (sctp_sstate(sk, LISTENING))
6135 sk->sk_max_ack_backlog = backlog;
6136 else {
6137 err = sctp_listen_start(sk, backlog);
6138 if (err)
6139 goto out;
6140 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006141
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006142 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006143out:
6144 sctp_release_sock(sk);
6145 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006146}
6147
6148/*
6149 * This function is done by modeling the current datagram_poll() and the
6150 * tcp_poll(). Note that, based on these implementations, we don't
6151 * lock the socket in this function, even though it seems that,
6152 * ideally, locking or some other mechanisms can be used to ensure
Neil Horman9bffc4a2005-12-19 14:24:40 -08006153 * the integrity of the counters (sndbuf and wmem_alloc) used
Linus Torvalds1da177e2005-04-16 15:20:36 -07006154 * in this place. We assume that we don't need locks either until proven
6155 * otherwise.
6156 *
6157 * Another thing to note is that we include the Async I/O support
6158 * here, again, by modeling the current TCP/UDP code. We don't have
6159 * a good way to test with it yet.
6160 */
6161unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
6162{
6163 struct sock *sk = sock->sk;
6164 struct sctp_sock *sp = sctp_sk(sk);
6165 unsigned int mask;
6166
Eric Dumazetaa395142010-04-20 13:03:51 +00006167 poll_wait(file, sk_sleep(sk), wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006168
6169 /* A TCP-style listening socket becomes readable when the accept queue
6170 * is not empty.
6171 */
6172 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
6173 return (!list_empty(&sp->ep->asocs)) ?
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09006174 (POLLIN | POLLRDNORM) : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006175
6176 mask = 0;
6177
6178 /* Is there any exceptional events? */
6179 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
Keller, Jacob E7d4c04f2013-03-28 11:19:25 +00006180 mask |= POLLERR |
Daniel Borkmanna0fb05d2013-09-07 16:44:59 +02006181 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
Davide Libenzif348d702006-03-25 03:07:39 -08006182 if (sk->sk_shutdown & RCV_SHUTDOWN)
Eric Dumazetdb409802010-09-06 11:13:50 +00006183 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006184 if (sk->sk_shutdown == SHUTDOWN_MASK)
6185 mask |= POLLHUP;
6186
6187 /* Is it readable? Reconsider this code with TCP-style support. */
Eric Dumazetdb409802010-09-06 11:13:50 +00006188 if (!skb_queue_empty(&sk->sk_receive_queue))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006189 mask |= POLLIN | POLLRDNORM;
6190
6191 /* The association is either gone or not ready. */
6192 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
6193 return mask;
6194
6195 /* Is it writable? */
6196 if (sctp_writeable(sk)) {
6197 mask |= POLLOUT | POLLWRNORM;
6198 } else {
6199 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
6200 /*
6201 * Since the socket is not locked, the buffer
6202 * might be made available after the writeable check and
6203 * before the bit is set. This could cause a lost I/O
6204 * signal. tcp_poll() has a race breaker for this race
6205 * condition. Based on their implementation, we put
6206 * in the following code to cover it as well.
6207 */
6208 if (sctp_writeable(sk))
6209 mask |= POLLOUT | POLLWRNORM;
6210 }
6211 return mask;
6212}
6213
6214/********************************************************************
6215 * 2nd Level Abstractions
6216 ********************************************************************/
6217
6218static struct sctp_bind_bucket *sctp_bucket_create(
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006219 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006220{
6221 struct sctp_bind_bucket *pp;
6222
Christoph Lameter54e6ecb2006-12-06 20:33:16 -08006223 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006224 if (pp) {
Li Zefan935a7f62008-04-10 01:58:06 -07006225 SCTP_DBG_OBJCNT_INC(bind_bucket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006226 pp->port = snum;
6227 pp->fastreuse = 0;
6228 INIT_HLIST_HEAD(&pp->owner);
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006229 pp->net = net;
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05006230 hlist_add_head(&pp->node, &head->chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006231 }
6232 return pp;
6233}
6234
6235/* Caller must hold hashbucket lock for this tb with local BH disabled */
6236static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6237{
Sridhar Samudrala37fa6872006-07-21 14:45:47 -07006238 if (pp && hlist_empty(&pp->owner)) {
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05006239 __hlist_del(&pp->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006240 kmem_cache_free(sctp_bucket_cachep, pp);
6241 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6242 }
6243}
6244
6245/* Release this socket's reference to a local port. */
6246static inline void __sctp_put_port(struct sock *sk)
6247{
6248 struct sctp_bind_hashbucket *head =
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006249 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
6250 inet_sk(sk)->inet_num)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07006251 struct sctp_bind_bucket *pp;
6252
6253 sctp_spin_lock(&head->lock);
6254 pp = sctp_sk(sk)->bind_hash;
6255 __sk_del_bind_node(sk);
6256 sctp_sk(sk)->bind_hash = NULL;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006257 inet_sk(sk)->inet_num = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006258 sctp_bucket_destroy(pp);
6259 sctp_spin_unlock(&head->lock);
6260}
6261
6262void sctp_put_port(struct sock *sk)
6263{
6264 sctp_local_bh_disable();
6265 __sctp_put_port(sk);
6266 sctp_local_bh_enable();
6267}
6268
6269/*
6270 * The system picks an ephemeral port and choose an address set equivalent
6271 * to binding with a wildcard address.
6272 * One of those addresses will be the primary address for the association.
6273 * This automatically enables the multihoming capability of SCTP.
6274 */
6275static int sctp_autobind(struct sock *sk)
6276{
6277 union sctp_addr autoaddr;
6278 struct sctp_af *af;
Al Viro6fbfa9f2006-11-20 17:24:53 -08006279 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006280
6281 /* Initialize a local sockaddr structure to INADDR_ANY. */
6282 af = sctp_sk(sk)->pf->af;
6283
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006284 port = htons(inet_sk(sk)->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006285 af->inaddr_any(&autoaddr, port);
6286
6287 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6288}
6289
6290/* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6291 *
6292 * From RFC 2292
6293 * 4.2 The cmsghdr Structure *
6294 *
6295 * When ancillary data is sent or received, any number of ancillary data
6296 * objects can be specified by the msg_control and msg_controllen members of
6297 * the msghdr structure, because each object is preceded by
6298 * a cmsghdr structure defining the object's length (the cmsg_len member).
6299 * Historically Berkeley-derived implementations have passed only one object
6300 * at a time, but this API allows multiple objects to be
6301 * passed in a single call to sendmsg() or recvmsg(). The following example
6302 * shows two ancillary data objects in a control buffer.
6303 *
6304 * |<--------------------------- msg_controllen -------------------------->|
6305 * | |
6306 *
6307 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6308 *
6309 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6310 * | | |
6311 *
6312 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6313 *
6314 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6315 * | | | | |
6316 *
6317 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6318 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6319 *
6320 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6321 *
6322 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6323 * ^
6324 * |
6325 *
6326 * msg_control
6327 * points here
6328 */
Daniel Borkmanndda91922013-06-17 11:40:05 +02006329static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006330{
6331 struct cmsghdr *cmsg;
Vlad Yasevichab38fb02008-04-12 18:40:06 -07006332 struct msghdr *my_msg = (struct msghdr *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006333
6334 for (cmsg = CMSG_FIRSTHDR(msg);
6335 cmsg != NULL;
Vlad Yasevichab38fb02008-04-12 18:40:06 -07006336 cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
6337 if (!CMSG_OK(my_msg, cmsg))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006338 return -EINVAL;
6339
6340 /* Should we parse this header or ignore? */
6341 if (cmsg->cmsg_level != IPPROTO_SCTP)
6342 continue;
6343
6344 /* Strictly check lengths following example in SCM code. */
6345 switch (cmsg->cmsg_type) {
6346 case SCTP_INIT:
6347 /* SCTP Socket API Extension
6348 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
6349 *
6350 * This cmsghdr structure provides information for
6351 * initializing new SCTP associations with sendmsg().
6352 * The SCTP_INITMSG socket option uses this same data
6353 * structure. This structure is not used for
6354 * recvmsg().
6355 *
6356 * cmsg_level cmsg_type cmsg_data[]
6357 * ------------ ------------ ----------------------
6358 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6359 */
6360 if (cmsg->cmsg_len !=
6361 CMSG_LEN(sizeof(struct sctp_initmsg)))
6362 return -EINVAL;
6363 cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
6364 break;
6365
6366 case SCTP_SNDRCV:
6367 /* SCTP Socket API Extension
6368 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6369 *
6370 * This cmsghdr structure specifies SCTP options for
6371 * sendmsg() and describes SCTP header information
6372 * about a received message through recvmsg().
6373 *
6374 * cmsg_level cmsg_type cmsg_data[]
6375 * ------------ ------------ ----------------------
6376 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6377 */
6378 if (cmsg->cmsg_len !=
6379 CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6380 return -EINVAL;
6381
6382 cmsgs->info =
6383 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
6384
6385 /* Minimally, validate the sinfo_flags. */
6386 if (cmsgs->info->sinfo_flags &
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07006387 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6388 SCTP_ABORT | SCTP_EOF))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006389 return -EINVAL;
6390 break;
6391
6392 default:
6393 return -EINVAL;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07006394 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006395 }
6396 return 0;
6397}
6398
6399/*
6400 * Wait for a packet..
6401 * Note: This function is the same function as in core/datagram.c
6402 * with a few modifications to make lksctp work.
6403 */
6404static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p)
6405{
6406 int error;
6407 DEFINE_WAIT(wait);
6408
Eric Dumazetaa395142010-04-20 13:03:51 +00006409 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006410
6411 /* Socket errors? */
6412 error = sock_error(sk);
6413 if (error)
6414 goto out;
6415
6416 if (!skb_queue_empty(&sk->sk_receive_queue))
6417 goto ready;
6418
6419 /* Socket shut down? */
6420 if (sk->sk_shutdown & RCV_SHUTDOWN)
6421 goto out;
6422
6423 /* Sequenced packets can come disconnected. If so we report the
6424 * problem.
6425 */
6426 error = -ENOTCONN;
6427
6428 /* Is there a good reason to think that we may receive some data? */
6429 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6430 goto out;
6431
6432 /* Handle signals. */
6433 if (signal_pending(current))
6434 goto interrupted;
6435
6436 /* Let another process have a go. Since we are going to sleep
6437 * anyway. Note: This may cause odd behaviors if the message
6438 * does not fit in the user's buffer, but this seems to be the
6439 * only way to honor MSG_DONTWAIT realistically.
6440 */
6441 sctp_release_sock(sk);
6442 *timeo_p = schedule_timeout(*timeo_p);
6443 sctp_lock_sock(sk);
6444
6445ready:
Eric Dumazetaa395142010-04-20 13:03:51 +00006446 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006447 return 0;
6448
6449interrupted:
6450 error = sock_intr_errno(*timeo_p);
6451
6452out:
Eric Dumazetaa395142010-04-20 13:03:51 +00006453 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006454 *err = error;
6455 return error;
6456}
6457
6458/* Receive a datagram.
6459 * Note: This is pretty much the same routine as in core/datagram.c
6460 * with a few changes to make lksctp work.
6461 */
6462static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6463 int noblock, int *err)
6464{
6465 int error;
6466 struct sk_buff *skb;
6467 long timeo;
6468
Linus Torvalds1da177e2005-04-16 15:20:36 -07006469 timeo = sock_rcvtimeo(sk, noblock);
6470
Daniel Borkmannbb333812013-06-28 19:49:40 +02006471 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
6472 MAX_SCHEDULE_TIMEOUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006473
6474 do {
6475 /* Again only user level code calls this function,
6476 * so nothing interrupt level
6477 * will suddenly eat the receive_queue.
6478 *
6479 * Look at current nfs client by the way...
David Shwatrz8917a3c2010-12-02 09:01:55 +00006480 * However, this function was correct in any case. 8)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006481 */
6482 if (flags & MSG_PEEK) {
Herbert Xu1e061ab2005-06-18 22:56:42 -07006483 spin_lock_bh(&sk->sk_receive_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006484 skb = skb_peek(&sk->sk_receive_queue);
6485 if (skb)
6486 atomic_inc(&skb->users);
Herbert Xu1e061ab2005-06-18 22:56:42 -07006487 spin_unlock_bh(&sk->sk_receive_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006488 } else {
6489 skb = skb_dequeue(&sk->sk_receive_queue);
6490 }
6491
6492 if (skb)
6493 return skb;
6494
Neil Horman6736dc32005-12-02 20:30:06 -08006495 /* Caller is allowed not to check sk->sk_err before calling. */
6496 error = sock_error(sk);
6497 if (error)
6498 goto no_packet;
6499
Linus Torvalds1da177e2005-04-16 15:20:36 -07006500 if (sk->sk_shutdown & RCV_SHUTDOWN)
6501 break;
6502
6503 /* User doesn't want to wait. */
6504 error = -EAGAIN;
6505 if (!timeo)
6506 goto no_packet;
6507 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6508
6509 return NULL;
6510
6511no_packet:
6512 *err = error;
6513 return NULL;
6514}
6515
6516/* If sndbuf has changed, wake up per association sndbuf waiters. */
6517static void __sctp_write_space(struct sctp_association *asoc)
6518{
6519 struct sock *sk = asoc->base.sk;
6520 struct socket *sock = sk->sk_socket;
6521
6522 if ((sctp_wspace(asoc) > 0) && sock) {
6523 if (waitqueue_active(&asoc->wait))
6524 wake_up_interruptible(&asoc->wait);
6525
6526 if (sctp_writeable(sk)) {
Eric Dumazeteaefd112011-02-18 03:26:36 +00006527 wait_queue_head_t *wq = sk_sleep(sk);
6528
6529 if (wq && waitqueue_active(wq))
6530 wake_up_interruptible(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006531
6532 /* Note that we try to include the Async I/O support
6533 * here by modeling from the current TCP/UDP code.
6534 * We have not tested with it yet.
6535 */
Eric Dumazeteaefd112011-02-18 03:26:36 +00006536 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08006537 sock_wake_async(sock,
6538 SOCK_WAKE_SPACE, POLL_OUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006539 }
6540 }
6541}
6542
6543/* Do accounting for the sndbuf space.
6544 * Decrement the used sndbuf space of the corresponding association by the
6545 * data size which was just transmitted(freed).
6546 */
6547static void sctp_wfree(struct sk_buff *skb)
6548{
6549 struct sctp_association *asoc;
6550 struct sctp_chunk *chunk;
6551 struct sock *sk;
6552
6553 /* Get the saved chunk pointer. */
6554 chunk = *((struct sctp_chunk **)(skb->cb));
6555 asoc = chunk->asoc;
6556 sk = asoc->base.sk;
Neil Horman4eb701d2005-04-28 12:02:04 -07006557 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6558 sizeof(struct sk_buff) +
6559 sizeof(struct sctp_chunk);
6560
Neil Horman4eb701d2005-04-28 12:02:04 -07006561 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6562
Neil Horman4d93df02007-08-15 16:07:44 -07006563 /*
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006564 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
Neil Horman4d93df02007-08-15 16:07:44 -07006565 */
6566 sk->sk_wmem_queued -= skb->truesize;
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006567 sk_mem_uncharge(sk, skb->truesize);
Neil Horman4d93df02007-08-15 16:07:44 -07006568
Neil Horman4eb701d2005-04-28 12:02:04 -07006569 sock_wfree(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006570 __sctp_write_space(asoc);
6571
6572 sctp_association_put(asoc);
6573}
6574
Vlad Yasevich331c4ee2006-10-09 21:34:04 -07006575/* Do accounting for the receive space on the socket.
6576 * Accounting for the association is done in ulpevent.c
6577 * We set this as a destructor for the cloned data skbs so that
6578 * accounting is done at the correct time.
6579 */
6580void sctp_sock_rfree(struct sk_buff *skb)
6581{
6582 struct sock *sk = skb->sk;
6583 struct sctp_ulpevent *event = sctp_skb2event(skb);
6584
6585 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
Neil Horman4d93df02007-08-15 16:07:44 -07006586
6587 /*
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006588 * Mimic the behavior of sock_rfree
Neil Horman4d93df02007-08-15 16:07:44 -07006589 */
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006590 sk_mem_uncharge(sk, event->rmem_len);
Vlad Yasevich331c4ee2006-10-09 21:34:04 -07006591}
6592
6593
Linus Torvalds1da177e2005-04-16 15:20:36 -07006594/* Helper function to wait for space in the sndbuf. */
6595static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6596 size_t msg_len)
6597{
6598 struct sock *sk = asoc->base.sk;
6599 int err = 0;
6600 long current_timeo = *timeo_p;
6601 DEFINE_WAIT(wait);
6602
Daniel Borkmannbb333812013-06-28 19:49:40 +02006603 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
6604 *timeo_p, msg_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006605
6606 /* Increment the association's refcnt. */
6607 sctp_association_hold(asoc);
6608
6609 /* Wait on the association specific sndbuf space. */
6610 for (;;) {
6611 prepare_to_wait_exclusive(&asoc->wait, &wait,
6612 TASK_INTERRUPTIBLE);
6613 if (!*timeo_p)
6614 goto do_nonblock;
6615 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6616 asoc->base.dead)
6617 goto do_error;
6618 if (signal_pending(current))
6619 goto do_interrupted;
6620 if (msg_len <= sctp_wspace(asoc))
6621 break;
6622
6623 /* Let another process have a go. Since we are going
6624 * to sleep anyway.
6625 */
6626 sctp_release_sock(sk);
6627 current_timeo = schedule_timeout(current_timeo);
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07006628 BUG_ON(sk != asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006629 sctp_lock_sock(sk);
6630
6631 *timeo_p = current_timeo;
6632 }
6633
6634out:
6635 finish_wait(&asoc->wait, &wait);
6636
6637 /* Release the association's refcnt. */
6638 sctp_association_put(asoc);
6639
6640 return err;
6641
6642do_error:
6643 err = -EPIPE;
6644 goto out;
6645
6646do_interrupted:
6647 err = sock_intr_errno(*timeo_p);
6648 goto out;
6649
6650do_nonblock:
6651 err = -EAGAIN;
6652 goto out;
6653}
6654
Wei Yongjun561b1732010-04-28 08:47:18 +00006655void sctp_data_ready(struct sock *sk, int len)
6656{
David S. Miller7ef52732010-05-02 21:43:40 -07006657 struct socket_wq *wq;
6658
6659 rcu_read_lock();
6660 wq = rcu_dereference(sk->sk_wq);
6661 if (wq_has_sleeper(wq))
6662 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
Wei Yongjun561b1732010-04-28 08:47:18 +00006663 POLLRDNORM | POLLRDBAND);
6664 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
David S. Miller7ef52732010-05-02 21:43:40 -07006665 rcu_read_unlock();
Wei Yongjun561b1732010-04-28 08:47:18 +00006666}
6667
Linus Torvalds1da177e2005-04-16 15:20:36 -07006668/* If socket sndbuf has changed, wake up all per association waiters. */
6669void sctp_write_space(struct sock *sk)
6670{
6671 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006672
6673 /* Wake up the tasks in each wait queue. */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07006674 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006675 __sctp_write_space(asoc);
6676 }
6677}
6678
6679/* Is there any sndbuf space available on the socket?
6680 *
Neil Horman9bffc4a2005-12-19 14:24:40 -08006681 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07006682 * associations on the same socket. For a UDP-style socket with
6683 * multiple associations, it is possible for it to be "unwriteable"
6684 * prematurely. I assume that this is acceptable because
6685 * a premature "unwriteable" is better than an accidental "writeable" which
6686 * would cause an unwanted block under certain circumstances. For the 1-1
6687 * UDP-style sockets or TCP-style sockets, this code should work.
6688 * - Daisy
6689 */
6690static int sctp_writeable(struct sock *sk)
6691{
6692 int amt = 0;
6693
Eric Dumazet31e6d362009-06-17 19:05:41 -07006694 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006695 if (amt < 0)
6696 amt = 0;
6697 return amt;
6698}
6699
6700/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6701 * returns immediately with EINPROGRESS.
6702 */
6703static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
6704{
6705 struct sock *sk = asoc->base.sk;
6706 int err = 0;
6707 long current_timeo = *timeo_p;
6708 DEFINE_WAIT(wait);
6709
Daniel Borkmannbb333812013-06-28 19:49:40 +02006710 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006711
6712 /* Increment the association's refcnt. */
6713 sctp_association_hold(asoc);
6714
6715 for (;;) {
6716 prepare_to_wait_exclusive(&asoc->wait, &wait,
6717 TASK_INTERRUPTIBLE);
6718 if (!*timeo_p)
6719 goto do_nonblock;
6720 if (sk->sk_shutdown & RCV_SHUTDOWN)
6721 break;
6722 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6723 asoc->base.dead)
6724 goto do_error;
6725 if (signal_pending(current))
6726 goto do_interrupted;
6727
6728 if (sctp_state(asoc, ESTABLISHED))
6729 break;
6730
6731 /* Let another process have a go. Since we are going
6732 * to sleep anyway.
6733 */
6734 sctp_release_sock(sk);
6735 current_timeo = schedule_timeout(current_timeo);
6736 sctp_lock_sock(sk);
6737
6738 *timeo_p = current_timeo;
6739 }
6740
6741out:
6742 finish_wait(&asoc->wait, &wait);
6743
6744 /* Release the association's refcnt. */
6745 sctp_association_put(asoc);
6746
6747 return err;
6748
6749do_error:
Vlad Yasevich81845c22006-01-30 15:59:54 -08006750 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006751 err = -ETIMEDOUT;
6752 else
6753 err = -ECONNREFUSED;
6754 goto out;
6755
6756do_interrupted:
6757 err = sock_intr_errno(*timeo_p);
6758 goto out;
6759
6760do_nonblock:
6761 err = -EINPROGRESS;
6762 goto out;
6763}
6764
6765static int sctp_wait_for_accept(struct sock *sk, long timeo)
6766{
6767 struct sctp_endpoint *ep;
6768 int err = 0;
6769 DEFINE_WAIT(wait);
6770
6771 ep = sctp_sk(sk)->ep;
6772
6773
6774 for (;;) {
Eric Dumazetaa395142010-04-20 13:03:51 +00006775 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
Linus Torvalds1da177e2005-04-16 15:20:36 -07006776 TASK_INTERRUPTIBLE);
6777
6778 if (list_empty(&ep->asocs)) {
6779 sctp_release_sock(sk);
6780 timeo = schedule_timeout(timeo);
6781 sctp_lock_sock(sk);
6782 }
6783
6784 err = -EINVAL;
6785 if (!sctp_sstate(sk, LISTENING))
6786 break;
6787
6788 err = 0;
6789 if (!list_empty(&ep->asocs))
6790 break;
6791
6792 err = sock_intr_errno(timeo);
6793 if (signal_pending(current))
6794 break;
6795
6796 err = -EAGAIN;
6797 if (!timeo)
6798 break;
6799 }
6800
Eric Dumazetaa395142010-04-20 13:03:51 +00006801 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006802
6803 return err;
6804}
6805
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +02006806static void sctp_wait_for_close(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006807{
6808 DEFINE_WAIT(wait);
6809
6810 do {
Eric Dumazetaa395142010-04-20 13:03:51 +00006811 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006812 if (list_empty(&sctp_sk(sk)->ep->asocs))
6813 break;
6814 sctp_release_sock(sk);
6815 timeout = schedule_timeout(timeout);
6816 sctp_lock_sock(sk);
6817 } while (!signal_pending(current) && timeout);
6818
Eric Dumazetaa395142010-04-20 13:03:51 +00006819 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006820}
6821
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006822static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
6823{
6824 struct sk_buff *frag;
6825
6826 if (!skb->data_len)
6827 goto done;
6828
6829 /* Don't forget the fragments. */
David S. Miller1b003be2009-06-09 00:22:35 -07006830 skb_walk_frags(skb, frag)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006831 sctp_skb_set_owner_r_frag(frag, sk);
6832
6833done:
6834 sctp_skb_set_owner_r(skb, sk);
6835}
6836
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006837void sctp_copy_sock(struct sock *newsk, struct sock *sk,
6838 struct sctp_association *asoc)
6839{
6840 struct inet_sock *inet = inet_sk(sk);
Julia Lawall09cb47a2010-01-21 02:43:20 -08006841 struct inet_sock *newinet;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006842
6843 newsk->sk_type = sk->sk_type;
6844 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
6845 newsk->sk_flags = sk->sk_flags;
6846 newsk->sk_no_check = sk->sk_no_check;
6847 newsk->sk_reuse = sk->sk_reuse;
6848
6849 newsk->sk_shutdown = sk->sk_shutdown;
Daniel Borkmann0a2fbac2013-06-25 18:17:29 +02006850 newsk->sk_destruct = sctp_destruct_sock;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006851 newsk->sk_family = sk->sk_family;
6852 newsk->sk_protocol = IPPROTO_SCTP;
6853 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
6854 newsk->sk_sndbuf = sk->sk_sndbuf;
6855 newsk->sk_rcvbuf = sk->sk_rcvbuf;
6856 newsk->sk_lingertime = sk->sk_lingertime;
6857 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
6858 newsk->sk_sndtimeo = sk->sk_sndtimeo;
6859
6860 newinet = inet_sk(newsk);
6861
6862 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6863 * getsockname() and getpeername()
6864 */
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006865 newinet->inet_sport = inet->inet_sport;
6866 newinet->inet_saddr = inet->inet_saddr;
6867 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
6868 newinet->inet_dport = htons(asoc->peer.port);
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006869 newinet->pmtudisc = inet->pmtudisc;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006870 newinet->inet_id = asoc->next_tsn ^ jiffies;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006871
6872 newinet->uc_ttl = inet->uc_ttl;
6873 newinet->mc_loop = 1;
6874 newinet->mc_ttl = 1;
6875 newinet->mc_index = 0;
6876 newinet->mc_list = NULL;
6877}
6878
Linus Torvalds1da177e2005-04-16 15:20:36 -07006879/* Populate the fields of the newsk from the oldsk and migrate the assoc
6880 * and its messages to the newsk.
6881 */
6882static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
6883 struct sctp_association *assoc,
6884 sctp_socket_type_t type)
6885{
6886 struct sctp_sock *oldsp = sctp_sk(oldsk);
6887 struct sctp_sock *newsp = sctp_sk(newsk);
6888 struct sctp_bind_bucket *pp; /* hash list port iterator */
6889 struct sctp_endpoint *newep = newsp->ep;
6890 struct sk_buff *skb, *tmp;
6891 struct sctp_ulpevent *event;
Vlad Yasevichf26f7c42007-12-06 22:50:27 -08006892 struct sctp_bind_hashbucket *head;
Michio Honda9f7d6532011-04-26 19:32:51 +09006893 struct list_head tmplist;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006894
6895 /* Migrate socket buffer sizes and all the socket level options to the
6896 * new socket.
6897 */
6898 newsk->sk_sndbuf = oldsk->sk_sndbuf;
6899 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
6900 /* Brute force copy old sctp opt. */
Michio Honda9f7d6532011-04-26 19:32:51 +09006901 if (oldsp->do_auto_asconf) {
6902 memcpy(&tmplist, &newsp->auto_asconf_list, sizeof(tmplist));
6903 inet_sk_copy_descendant(newsk, oldsk);
6904 memcpy(&newsp->auto_asconf_list, &tmplist, sizeof(tmplist));
6905 } else
6906 inet_sk_copy_descendant(newsk, oldsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006907
6908 /* Restore the ep value that was overwritten with the above structure
6909 * copy.
6910 */
6911 newsp->ep = newep;
6912 newsp->hmac = NULL;
6913
6914 /* Hook this new socket in to the bind_hash list. */
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006915 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
6916 inet_sk(oldsk)->inet_num)];
Vlad Yasevichf26f7c42007-12-06 22:50:27 -08006917 sctp_local_bh_disable();
6918 sctp_spin_lock(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006919 pp = sctp_sk(oldsk)->bind_hash;
6920 sk_add_bind_node(newsk, &pp->owner);
6921 sctp_sk(newsk)->bind_hash = pp;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006922 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
Vlad Yasevichf26f7c42007-12-06 22:50:27 -08006923 sctp_spin_unlock(&head->lock);
6924 sctp_local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006925
Vladislav Yasevich4243cac2005-06-13 15:10:49 -07006926 /* Copy the bind_addr list from the original endpoint to the new
6927 * endpoint so that we can handle restarts properly
6928 */
Vlad Yasevich8e71a112007-12-06 22:50:54 -08006929 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
6930 &oldsp->ep->base.bind_addr, GFP_KERNEL);
Vladislav Yasevich4243cac2005-06-13 15:10:49 -07006931
Linus Torvalds1da177e2005-04-16 15:20:36 -07006932 /* Move any messages in the old socket's receive queue that are for the
6933 * peeled off association to the new socket's receive queue.
6934 */
6935 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
6936 event = sctp_skb2event(skb);
6937 if (event->asoc == assoc) {
David S. Miller8728b832005-08-09 19:25:21 -07006938 __skb_unlink(skb, &oldsk->sk_receive_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006939 __skb_queue_tail(&newsk->sk_receive_queue, skb);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006940 sctp_skb_set_owner_r_frag(skb, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006941 }
6942 }
6943
6944 /* Clean up any messages pending delivery due to partial
6945 * delivery. Three cases:
6946 * 1) No partial deliver; no work.
6947 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6948 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6949 */
6950 skb_queue_head_init(&newsp->pd_lobby);
Vlad Yasevichb6e13312007-04-20 12:23:15 -07006951 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006952
Vlad Yasevichb6e13312007-04-20 12:23:15 -07006953 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006954 struct sk_buff_head *queue;
6955
6956 /* Decide which queue to move pd_lobby skbs to. */
6957 if (assoc->ulpq.pd_mode) {
6958 queue = &newsp->pd_lobby;
6959 } else
6960 queue = &newsk->sk_receive_queue;
6961
6962 /* Walk through the pd_lobby, looking for skbs that
6963 * need moved to the new socket.
6964 */
6965 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
6966 event = sctp_skb2event(skb);
6967 if (event->asoc == assoc) {
David S. Miller8728b832005-08-09 19:25:21 -07006968 __skb_unlink(skb, &oldsp->pd_lobby);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006969 __skb_queue_tail(queue, skb);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006970 sctp_skb_set_owner_r_frag(skb, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006971 }
6972 }
6973
6974 /* Clear up any skbs waiting for the partial
6975 * delivery to finish.
6976 */
6977 if (assoc->ulpq.pd_mode)
Vlad Yasevichb6e13312007-04-20 12:23:15 -07006978 sctp_clear_pd(oldsk, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006979
6980 }
6981
Wei Yongjun1bc4ee42009-07-05 19:45:48 +00006982 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006983 sctp_skb_set_owner_r_frag(skb, newsk);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006984
Wei Yongjun1bc4ee42009-07-05 19:45:48 +00006985 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006986 sctp_skb_set_owner_r_frag(skb, newsk);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006987
Linus Torvalds1da177e2005-04-16 15:20:36 -07006988 /* Set the type of socket to indicate that it is peeled off from the
6989 * original UDP-style socket or created with the accept() call on a
6990 * TCP-style socket..
6991 */
6992 newsp->type = type;
6993
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07006994 /* Mark the new socket "in-use" by the user so that any packets
6995 * that may arrive on the association after we've moved it are
6996 * queued to the backlog. This prevents a potential race between
6997 * backlog processing on the old socket and new-packet processing
6998 * on the new socket.
Zach Brown5131a182007-06-22 15:14:46 -07006999 *
7000 * The caller has just allocated newsk so we can guarantee that other
7001 * paths won't try to lock it and then oldsk.
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07007002 */
Zach Brown5131a182007-06-22 15:14:46 -07007003 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007004 sctp_assoc_migrate(assoc, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007005
7006 /* If the association on the newsk is already closed before accept()
7007 * is called, set RCV_SHUTDOWN flag.
7008 */
7009 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
7010 newsk->sk_shutdown |= RCV_SHUTDOWN;
7011
7012 newsk->sk_state = SCTP_SS_ESTABLISHED;
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07007013 sctp_release_sock(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007014}
7015
Neil Horman4d93df02007-08-15 16:07:44 -07007016
Linus Torvalds1da177e2005-04-16 15:20:36 -07007017/* This proto struct describes the ULP interface for SCTP. */
7018struct proto sctp_prot = {
7019 .name = "SCTP",
7020 .owner = THIS_MODULE,
7021 .close = sctp_close,
7022 .connect = sctp_connect,
7023 .disconnect = sctp_disconnect,
7024 .accept = sctp_accept,
7025 .ioctl = sctp_ioctl,
7026 .init = sctp_init_sock,
7027 .destroy = sctp_destroy_sock,
7028 .shutdown = sctp_shutdown,
7029 .setsockopt = sctp_setsockopt,
7030 .getsockopt = sctp_getsockopt,
7031 .sendmsg = sctp_sendmsg,
7032 .recvmsg = sctp_recvmsg,
7033 .bind = sctp_bind,
7034 .backlog_rcv = sctp_backlog_rcv,
7035 .hash = sctp_hash,
7036 .unhash = sctp_unhash,
7037 .get_port = sctp_get_port,
7038 .obj_size = sizeof(struct sctp_sock),
Neil Horman4d93df02007-08-15 16:07:44 -07007039 .sysctl_mem = sysctl_sctp_mem,
7040 .sysctl_rmem = sysctl_sctp_rmem,
7041 .sysctl_wmem = sysctl_sctp_wmem,
7042 .memory_pressure = &sctp_memory_pressure,
7043 .enter_memory_pressure = sctp_enter_memory_pressure,
7044 .memory_allocated = &sctp_memory_allocated,
Pavel Emelyanov5f318862008-02-20 00:23:01 -08007045 .sockets_allocated = &sctp_sockets_allocated,
Linus Torvalds1da177e2005-04-16 15:20:36 -07007046};
7047
Eric Dumazetdfd56b82011-12-10 09:48:31 +00007048#if IS_ENABLED(CONFIG_IPV6)
Eric Dumazet8295b6d2007-11-05 23:40:28 -08007049
Linus Torvalds1da177e2005-04-16 15:20:36 -07007050struct proto sctpv6_prot = {
7051 .name = "SCTPv6",
7052 .owner = THIS_MODULE,
7053 .close = sctp_close,
7054 .connect = sctp_connect,
7055 .disconnect = sctp_disconnect,
7056 .accept = sctp_accept,
7057 .ioctl = sctp_ioctl,
7058 .init = sctp_init_sock,
7059 .destroy = sctp_destroy_sock,
7060 .shutdown = sctp_shutdown,
7061 .setsockopt = sctp_setsockopt,
7062 .getsockopt = sctp_getsockopt,
7063 .sendmsg = sctp_sendmsg,
7064 .recvmsg = sctp_recvmsg,
7065 .bind = sctp_bind,
7066 .backlog_rcv = sctp_backlog_rcv,
7067 .hash = sctp_hash,
7068 .unhash = sctp_unhash,
7069 .get_port = sctp_get_port,
7070 .obj_size = sizeof(struct sctp6_sock),
Neil Horman4d93df02007-08-15 16:07:44 -07007071 .sysctl_mem = sysctl_sctp_mem,
7072 .sysctl_rmem = sysctl_sctp_rmem,
7073 .sysctl_wmem = sysctl_sctp_wmem,
7074 .memory_pressure = &sctp_memory_pressure,
7075 .enter_memory_pressure = sctp_enter_memory_pressure,
7076 .memory_allocated = &sctp_memory_allocated,
Pavel Emelyanov5f318862008-02-20 00:23:01 -08007077 .sockets_allocated = &sctp_sockets_allocated,
Linus Torvalds1da177e2005-04-16 15:20:36 -07007078};
Eric Dumazetdfd56b82011-12-10 09:48:31 +00007079#endif /* IS_ENABLED(CONFIG_IPV6) */