blob: 4b0fe740f664a0ebbcdab0a438f531e927b96969 [file] [log] [blame]
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
31 * along with GNU CC; see the file COPYING. If not, write to
32 * the Free Software Foundation, 59 Temple Place - Suite 330,
33 * Boston, MA 02111-1307, USA.
34 *
35 * Please send any bug reports or fixes you make to the
36 * email address(es):
37 * lksctp developers <lksctp-developers@lists.sourceforge.net>
38 *
39 * Or submit a bug report through the following website:
40 * http://www.sf.net/projects/lksctp
41 *
42 * Written or modified by:
43 * La Monte H.P. Yarroll <piggy@acm.org>
44 * Narasimha Budihal <narsi@refcode.org>
45 * Karl Knutson <karl@athena.chicago.il.us>
46 * Jon Grimm <jgrimm@us.ibm.com>
47 * Xingang Guo <xingang.guo@intel.com>
48 * Daisy Chang <daisyc@us.ibm.com>
49 * Sridhar Samudrala <samudrala@us.ibm.com>
50 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
51 * Ardelle Fan <ardelle.fan@intel.com>
52 * Ryan Layer <rmlayer@us.ibm.com>
53 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
54 * Kevin Gao <kevin.gao@intel.com>
55 *
56 * Any bugs reported given to us we will try to fix... any fixes shared will
57 * be incorporated into the next SCTP release.
58 */
59
Joe Perches145ce502010-08-24 13:21:08 +000060#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/types.h>
63#include <linux/kernel.h>
64#include <linux/wait.h>
65#include <linux/time.h>
66#include <linux/ip.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080067#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <linux/fcntl.h>
69#include <linux/poll.h>
70#include <linux/init.h>
71#include <linux/crypto.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090072#include <linux/slab.h>
Al Viro56b31d12012-08-18 00:25:51 -040073#include <linux/file.h>
Daniel Borkmannb306713b2014-02-17 12:11:11 +010074#include <linux/compat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76#include <net/ip.h>
77#include <net/icmp.h>
78#include <net/route.h>
79#include <net/ipv6.h>
80#include <net/inet_common.h>
81
82#include <linux/socket.h> /* for sa_family_t */
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040083#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070084#include <net/sock.h>
85#include <net/sctp/sctp.h>
86#include <net/sctp/sm.h>
87
88/* WARNING: Please do not remove the SCTP_STATIC attribute to
89 * any of the functions below as they are used to export functions
90 * used by a project regression testsuite.
91 */
92
93/* Forward declarations for internal helper functions. */
94static int sctp_writeable(struct sock *sk);
95static void sctp_wfree(struct sk_buff *skb);
96static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
97 size_t msg_len);
98static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
99static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
100static int sctp_wait_for_accept(struct sock *sk, long timeo);
101static void sctp_wait_for_close(struct sock *sk, long timeo);
102static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
103 union sctp_addr *addr, int len);
104static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
105static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
106static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
107static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
108static int sctp_send_asconf(struct sctp_association *asoc,
109 struct sctp_chunk *chunk);
110static int sctp_do_bind(struct sock *, union sctp_addr *, int);
111static int sctp_autobind(struct sock *sk);
112static void sctp_sock_migrate(struct sock *, struct sock *,
113 struct sctp_association *, sctp_socket_type_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Neil Horman4d93df02007-08-15 16:07:44 -0700115extern struct kmem_cache *sctp_bucket_cachep;
Eric Dumazet8d987e52010-11-09 23:24:26 +0000116extern long sysctl_sctp_mem[3];
Neil Horman4d93df02007-08-15 16:07:44 -0700117extern int sysctl_sctp_rmem[3];
118extern int sysctl_sctp_wmem[3];
119
Adrian Bunkb6fa1a42007-09-12 15:18:00 +0200120static int sctp_memory_pressure;
Eric Dumazet8d987e52010-11-09 23:24:26 +0000121static atomic_long_t sctp_memory_allocated;
Eric Dumazet17483762008-11-25 21:16:35 -0800122struct percpu_counter sctp_sockets_allocated;
Neil Horman4d93df02007-08-15 16:07:44 -0700123
Pavel Emelyanov5c52ba12008-07-16 20:28:10 -0700124static void sctp_enter_memory_pressure(struct sock *sk)
Neil Horman4d93df02007-08-15 16:07:44 -0700125{
126 sctp_memory_pressure = 1;
127}
128
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130/* Get the sndbuf space available at the time on the association. */
131static inline int sctp_wspace(struct sctp_association *asoc)
132{
Neil Horman4d93df02007-08-15 16:07:44 -0700133 int amt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Neil Horman4d93df02007-08-15 16:07:44 -0700135 if (asoc->ep->sndbuf_policy)
136 amt = asoc->sndbuf_used;
137 else
Eric Dumazet31e6d362009-06-17 19:05:41 -0700138 amt = sk_wmem_alloc_get(asoc->base.sk);
Neil Horman4d93df02007-08-15 16:07:44 -0700139
140 if (amt >= asoc->base.sk->sk_sndbuf) {
141 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
142 amt = 0;
143 else {
144 amt = sk_stream_wspace(asoc->base.sk);
145 if (amt < 0)
146 amt = 0;
147 }
Neil Horman4eb701d2005-04-28 12:02:04 -0700148 } else {
Neil Horman4d93df02007-08-15 16:07:44 -0700149 amt = asoc->base.sk->sk_sndbuf - amt;
Neil Horman4eb701d2005-04-28 12:02:04 -0700150 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 return amt;
152}
153
154/* Increment the used sndbuf space count of the corresponding association by
155 * the size of the outgoing data chunk.
156 * Also, set the skb destructor for sndbuf accounting later.
157 *
158 * Since it is always 1-1 between chunk and skb, and also a new skb is always
159 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
160 * destructor in the data chunk skb for the purpose of the sndbuf space
161 * tracking.
162 */
163static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
164{
165 struct sctp_association *asoc = chunk->asoc;
166 struct sock *sk = asoc->base.sk;
167
168 /* The sndbuf space is tracked per association. */
169 sctp_association_hold(asoc);
170
Neil Horman4eb701d2005-04-28 12:02:04 -0700171 skb_set_owner_w(chunk->skb, sk);
172
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 chunk->skb->destructor = sctp_wfree;
174 /* Save the chunk pointer in skb for sctp_wfree to use later. */
175 *((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
176
Neil Horman4eb701d2005-04-28 12:02:04 -0700177 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
178 sizeof(struct sk_buff) +
179 sizeof(struct sctp_chunk);
180
Neil Horman4eb701d2005-04-28 12:02:04 -0700181 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
Hideo Aoki3ab224b2007-12-31 00:11:19 -0800182 sk->sk_wmem_queued += chunk->skb->truesize;
183 sk_mem_charge(sk, chunk->skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184}
185
186/* Verify that this is a valid address. */
187static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
188 int len)
189{
190 struct sctp_af *af;
191
192 /* Verify basic sockaddr. */
193 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
194 if (!af)
195 return -EINVAL;
196
197 /* Is this a valid SCTP address? */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700198 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 return -EINVAL;
200
201 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
202 return -EINVAL;
203
204 return 0;
205}
206
207/* Look up the association by its id. If this is not a UDP-style
208 * socket, the ID field is always ignored.
209 */
210struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
211{
212 struct sctp_association *asoc = NULL;
213
214 /* If this is not a UDP-style socket, assoc id should be ignored. */
215 if (!sctp_style(sk, UDP)) {
216 /* Return NULL if the socket state is not ESTABLISHED. It
217 * could be a TCP-style listening socket or a socket which
218 * hasn't yet called connect() to establish an association.
219 */
220 if (!sctp_sstate(sk, ESTABLISHED))
221 return NULL;
222
223 /* Get the first and the only association from the list. */
224 if (!list_empty(&sctp_sk(sk)->ep->asocs))
225 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
226 struct sctp_association, asocs);
227 return asoc;
228 }
229
230 /* Otherwise this is a UDP-style socket. */
231 if (!id || (id == (sctp_assoc_t)-1))
232 return NULL;
233
234 spin_lock_bh(&sctp_assocs_id_lock);
235 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
236 spin_unlock_bh(&sctp_assocs_id_lock);
237
238 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
239 return NULL;
240
241 return asoc;
242}
243
244/* Look up the transport from an address and an assoc id. If both address and
245 * id are specified, the associations matching the address and the id should be
246 * the same.
247 */
248static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
249 struct sockaddr_storage *addr,
250 sctp_assoc_t id)
251{
252 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
253 struct sctp_transport *transport;
254 union sctp_addr *laddr = (union sctp_addr *)addr;
255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
Al Virocd4ff032006-11-20 17:11:33 -0800257 laddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
260 if (!addr_asoc)
261 return NULL;
262
263 id_asoc = sctp_id2assoc(sk, id);
264 if (id_asoc && (id_asoc != addr_asoc))
265 return NULL;
266
267 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
268 (union sctp_addr *)addr);
269
270 return transport;
271}
272
273/* API 3.1.2 bind() - UDP Style Syntax
274 * The syntax of bind() is,
275 *
276 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
277 *
278 * sd - the socket descriptor returned by socket().
279 * addr - the address structure (struct sockaddr_in or struct
280 * sockaddr_in6 [RFC 2553]),
281 * addr_len - the size of the address structure.
282 */
Frank Filz3f7a87d2005-06-20 13:14:57 -0700283SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284{
285 int retval = 0;
286
287 sctp_lock_sock(sk);
288
Frank Filz3f7a87d2005-06-20 13:14:57 -0700289 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
290 sk, addr, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 /* Disallow binding twice. */
293 if (!sctp_sk(sk)->ep->base.bind_addr.port)
Frank Filz3f7a87d2005-06-20 13:14:57 -0700294 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 addr_len);
296 else
297 retval = -EINVAL;
298
299 sctp_release_sock(sk);
300
301 return retval;
302}
303
304static long sctp_get_port_local(struct sock *, union sctp_addr *);
305
306/* Verify this is a valid sockaddr. */
307static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
308 union sctp_addr *addr, int len)
309{
310 struct sctp_af *af;
311
312 /* Check minimum size. */
313 if (len < sizeof (struct sockaddr))
314 return NULL;
315
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700316 /* V4 mapped address are really of AF_INET family */
317 if (addr->sa.sa_family == AF_INET6 &&
318 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
319 if (!opt->pf->af_supported(AF_INET, opt))
320 return NULL;
321 } else {
322 /* Does this PF support this AF? */
323 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
324 return NULL;
325 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327 /* If we get this far, af is valid. */
328 af = sctp_get_af_specific(addr->sa.sa_family);
329
330 if (len < af->sockaddr_len)
331 return NULL;
332
333 return af;
334}
335
336/* Bind a local address either to an endpoint or to an association. */
337SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
338{
Eric W. Biederman35946982012-11-16 03:03:12 +0000339 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 struct sctp_sock *sp = sctp_sk(sk);
341 struct sctp_endpoint *ep = sp->ep;
342 struct sctp_bind_addr *bp = &ep->base.bind_addr;
343 struct sctp_af *af;
344 unsigned short snum;
345 int ret = 0;
346
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 /* Common sockaddr verification. */
348 af = sctp_sockaddr_af(sp, addr, len);
Frank Filz3f7a87d2005-06-20 13:14:57 -0700349 if (!af) {
350 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
351 sk, addr, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 return -EINVAL;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700353 }
354
355 snum = ntohs(addr->v4.sin_port);
356
357 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
358 ", port: %d, new port: %d, len: %d)\n",
359 sk,
360 addr,
361 bp->port, snum,
362 len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
364 /* PF specific bind() address verification. */
365 if (!sp->pf->bind_verify(sp, addr))
366 return -EADDRNOTAVAIL;
367
Vlad Yasevich8b358052007-05-15 17:14:58 -0400368 /* We must either be unbound, or bind to the same port.
369 * It's OK to allow 0 ports if we are already bound.
370 * We'll just inhert an already bound port in this case
371 */
372 if (bp->port) {
373 if (!snum)
374 snum = bp->port;
375 else if (snum != bp->port) {
376 SCTP_DEBUG_PRINTK("sctp_do_bind:"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 " New port %d does not match existing port "
378 "%d.\n", snum, bp->port);
Vlad Yasevich8b358052007-05-15 17:14:58 -0400379 return -EINVAL;
380 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 }
382
Eric W. Biederman35946982012-11-16 03:03:12 +0000383 if (snum && snum < PROT_SOCK &&
384 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 return -EACCES;
386
Vlad Yasevich4e540642008-07-18 23:06:32 -0700387 /* See if the address matches any of the addresses we may have
388 * already bound before checking against other endpoints.
389 */
390 if (sctp_bind_addr_match(bp, addr, sp))
391 return -EINVAL;
392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 /* Make sure we are allowed to bind here.
394 * The function sctp_get_port_local() does duplicate address
395 * detection.
396 */
Vlad Yasevich2772b492007-08-21 14:24:30 +0900397 addr->v4.sin_port = htons(snum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 if ((ret = sctp_get_port_local(sk, addr))) {
Vlad Yasevich4e540642008-07-18 23:06:32 -0700399 return -EADDRINUSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 }
401
402 /* Refresh ephemeral port. */
403 if (!bp->port)
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000404 bp->port = inet_sk(sk)->inet_num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
Vlad Yasevich559cf712007-09-16 16:03:28 -0700406 /* Add the address to the bind address list.
407 * Use GFP_ATOMIC since BHs will be disabled.
408 */
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800409 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
411 /* Copy back into socket for getsockname() use. */
412 if (!ret) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000413 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 af->to_sk_saddr(addr, sk);
415 }
416
417 return ret;
418}
419
420 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
421 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900422 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 * at any one time. If a sender, after sending an ASCONF chunk, decides
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900424 * it needs to transfer another ASCONF Chunk, it MUST wait until the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900426 * subsequent ASCONF. Note this restriction binds each side, so at any
427 * time two ASCONF may be in-transit on any given association (one sent
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 * from each endpoint).
429 */
430static int sctp_send_asconf(struct sctp_association *asoc,
431 struct sctp_chunk *chunk)
432{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000433 struct net *net = sock_net(asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 int retval = 0;
435
436 /* If there is an outstanding ASCONF chunk, queue it for later
437 * transmission.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900438 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 if (asoc->addip_last_asconf) {
David S. Miller79af02c2005-07-08 21:47:49 -0700440 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900441 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 }
443
444 /* Hold the chunk until an ASCONF_ACK is received. */
445 sctp_chunk_hold(chunk);
Eric W. Biederman55e26eb2012-08-07 07:25:24 +0000446 retval = sctp_primitive_ASCONF(net, asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 if (retval)
448 sctp_chunk_free(chunk);
449 else
450 asoc->addip_last_asconf = chunk;
451
452out:
453 return retval;
454}
455
456/* Add a list of addresses as bind addresses to local endpoint or
457 * association.
458 *
459 * Basically run through each address specified in the addrs/addrcnt
460 * array/length pair, determine if it is IPv6 or IPv4 and call
461 * sctp_do_bind() on it.
462 *
463 * If any of them fails, then the operation will be reversed and the
464 * ones that were added will be removed.
465 *
466 * Only sctp_setsockopt_bindx() is supposed to call this function.
467 */
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +0200468static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469{
470 int cnt;
471 int retval = 0;
472 void *addr_buf;
473 struct sockaddr *sa_addr;
474 struct sctp_af *af;
475
476 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
477 sk, addrs, addrcnt);
478
479 addr_buf = addrs;
480 for (cnt = 0; cnt < addrcnt; cnt++) {
481 /* The list may contain either IPv4 or IPv6 address;
482 * determine the address length for walking thru the list.
483 */
Joe Perchesea110732011-06-13 16:21:26 +0000484 sa_addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 af = sctp_get_af_specific(sa_addr->sa_family);
486 if (!af) {
487 retval = -EINVAL;
488 goto err_bindx_add;
489 }
490
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900491 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 af->sockaddr_len);
493
494 addr_buf += af->sockaddr_len;
495
496err_bindx_add:
497 if (retval < 0) {
498 /* Failed. Cleanup the ones that have been added */
499 if (cnt > 0)
500 sctp_bindx_rem(sk, addrs, cnt);
501 return retval;
502 }
503 }
504
505 return retval;
506}
507
508/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
509 * associations that are part of the endpoint indicating that a list of local
510 * addresses are added to the endpoint.
511 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900512 * If any of the addresses is already in the bind address list of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 * association, we do not send the chunk for that association. But it will not
514 * affect other associations.
515 *
516 * Only sctp_setsockopt_bindx() is supposed to call this function.
517 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900518static int sctp_send_asconf_add_ip(struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 struct sockaddr *addrs,
520 int addrcnt)
521{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000522 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 struct sctp_sock *sp;
524 struct sctp_endpoint *ep;
525 struct sctp_association *asoc;
526 struct sctp_bind_addr *bp;
527 struct sctp_chunk *chunk;
528 struct sctp_sockaddr_entry *laddr;
529 union sctp_addr *addr;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700530 union sctp_addr saveaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 void *addr_buf;
532 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 struct list_head *p;
534 int i;
535 int retval = 0;
536
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000537 if (!net->sctp.addip_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 return retval;
539
540 sp = sctp_sk(sk);
541 ep = sp->ep;
542
543 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800544 __func__, sk, addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700546 list_for_each_entry(asoc, &ep->asocs, asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
548 if (!asoc->peer.asconf_capable)
549 continue;
550
551 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
552 continue;
553
554 if (!sctp_state(asoc, ESTABLISHED))
555 continue;
556
557 /* Check if any address in the packed array of addresses is
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900558 * in the bind address list of the association. If so,
559 * do not send the asconf chunk to its peer, but continue with
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 * other associations.
561 */
562 addr_buf = addrs;
563 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000564 addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 af = sctp_get_af_specific(addr->v4.sin_family);
566 if (!af) {
567 retval = -EINVAL;
568 goto out;
569 }
570
571 if (sctp_assoc_lookup_laddr(asoc, addr))
572 break;
573
574 addr_buf += af->sockaddr_len;
575 }
576 if (i < addrcnt)
577 continue;
578
Vlad Yasevich559cf712007-09-16 16:03:28 -0700579 /* Use the first valid address in bind addr list of
580 * association as Address Parameter of ASCONF CHUNK.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 bp = &asoc->base.bind_addr;
583 p = bp->address_list.next;
584 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
Al Viro5ae955c2006-11-20 17:22:08 -0800585 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 addrcnt, SCTP_PARAM_ADD_IP);
587 if (!chunk) {
588 retval = -ENOMEM;
589 goto out;
590 }
591
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700592 /* Add the new addresses to the bind address list with
593 * use_as_src set to 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 */
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700595 addr_buf = addrs;
596 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000597 addr = addr_buf;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700598 af = sctp_get_af_specific(addr->v4.sin_family);
599 memcpy(&saveaddr, addr, af->sockaddr_len);
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800600 retval = sctp_add_bind_addr(bp, &saveaddr,
601 SCTP_ADDR_NEW, GFP_ATOMIC);
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700602 addr_buf += af->sockaddr_len;
603 }
Michio Honda8a07eb02011-04-26 20:19:36 +0900604 if (asoc->src_out_of_asoc_ok) {
605 struct sctp_transport *trans;
606
607 list_for_each_entry(trans,
608 &asoc->peer.transport_addr_list, transports) {
609 /* Clear the source and route cache */
610 dst_release(trans->dst);
611 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
612 2*asoc->pathmtu, 4380));
613 trans->ssthresh = asoc->peer.i.a_rwnd;
614 trans->rto = asoc->rto_initial;
Michele Baldessari196d6752012-12-01 04:49:42 +0000615 sctp_max_rto(asoc, trans);
Michio Honda8a07eb02011-04-26 20:19:36 +0900616 trans->rtt = trans->srtt = trans->rttvar = 0;
617 sctp_transport_route(trans, NULL,
618 sctp_sk(asoc->base.sk));
619 }
620 }
621 retval = sctp_send_asconf(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 }
623
624out:
625 return retval;
626}
627
628/* Remove a list of addresses from bind addresses list. Do not remove the
629 * last address.
630 *
631 * Basically run through each address specified in the addrs/addrcnt
632 * array/length pair, determine if it is IPv6 or IPv4 and call
633 * sctp_del_bind() on it.
634 *
635 * If any of them fails, then the operation will be reversed and the
636 * ones that were removed will be added back.
637 *
638 * At least one address has to be left; if only one address is
639 * available, the operation will return -EBUSY.
640 *
641 * Only sctp_setsockopt_bindx() is supposed to call this function.
642 */
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +0200643static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644{
645 struct sctp_sock *sp = sctp_sk(sk);
646 struct sctp_endpoint *ep = sp->ep;
647 int cnt;
648 struct sctp_bind_addr *bp = &ep->base.bind_addr;
649 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 void *addr_buf;
Al Viroc9a08502006-11-20 17:07:48 -0800651 union sctp_addr *sa_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 struct sctp_af *af;
653
654 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
655 sk, addrs, addrcnt);
656
657 addr_buf = addrs;
658 for (cnt = 0; cnt < addrcnt; cnt++) {
659 /* If the bind address list is empty or if there is only one
660 * bind address, there is nothing more to be removed (we need
661 * at least one address here).
662 */
663 if (list_empty(&bp->address_list) ||
664 (sctp_list_single_entry(&bp->address_list))) {
665 retval = -EBUSY;
666 goto err_bindx_rem;
667 }
668
Joe Perchesea110732011-06-13 16:21:26 +0000669 sa_addr = addr_buf;
Al Viroc9a08502006-11-20 17:07:48 -0800670 af = sctp_get_af_specific(sa_addr->sa.sa_family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 if (!af) {
672 retval = -EINVAL;
673 goto err_bindx_rem;
674 }
Paolo Galtieri0304ff8a2007-04-17 12:52:36 -0700675
676 if (!af->addr_valid(sa_addr, sp, NULL)) {
677 retval = -EADDRNOTAVAIL;
678 goto err_bindx_rem;
679 }
680
Vlad Yasevichee9cbac2011-04-18 19:14:47 +0000681 if (sa_addr->v4.sin_port &&
682 sa_addr->v4.sin_port != htons(bp->port)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 retval = -EINVAL;
684 goto err_bindx_rem;
685 }
686
Vlad Yasevichee9cbac2011-04-18 19:14:47 +0000687 if (!sa_addr->v4.sin_port)
688 sa_addr->v4.sin_port = htons(bp->port);
689
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 /* FIXME - There is probably a need to check if sk->sk_saddr and
691 * sk->sk_rcv_addr are currently set to one of the addresses to
692 * be removed. This is something which needs to be looked into
693 * when we are fixing the outstanding issues with multi-homing
694 * socket routing and failover schemes. Refer to comments in
695 * sctp_do_bind(). -daisy
696 */
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -0400697 retval = sctp_del_bind_addr(bp, sa_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
699 addr_buf += af->sockaddr_len;
700err_bindx_rem:
701 if (retval < 0) {
702 /* Failed. Add the ones that has been removed back */
703 if (cnt > 0)
704 sctp_bindx_add(sk, addrs, cnt);
705 return retval;
706 }
707 }
708
709 return retval;
710}
711
712/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
713 * the associations that are part of the endpoint indicating that a list of
714 * local addresses are removed from the endpoint.
715 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900716 * If any of the addresses is already in the bind address list of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 * association, we do not send the chunk for that association. But it will not
718 * affect other associations.
719 *
720 * Only sctp_setsockopt_bindx() is supposed to call this function.
721 */
722static int sctp_send_asconf_del_ip(struct sock *sk,
723 struct sockaddr *addrs,
724 int addrcnt)
725{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000726 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 struct sctp_sock *sp;
728 struct sctp_endpoint *ep;
729 struct sctp_association *asoc;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700730 struct sctp_transport *transport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 struct sctp_bind_addr *bp;
732 struct sctp_chunk *chunk;
733 union sctp_addr *laddr;
734 void *addr_buf;
735 struct sctp_af *af;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700736 struct sctp_sockaddr_entry *saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 int i;
738 int retval = 0;
Michio Honda8a07eb02011-04-26 20:19:36 +0900739 int stored = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
Michio Honda8a07eb02011-04-26 20:19:36 +0900741 chunk = NULL;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +0000742 if (!net->sctp.addip_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 return retval;
744
745 sp = sctp_sk(sk);
746 ep = sp->ep;
747
748 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800749 __func__, sk, addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700751 list_for_each_entry(asoc, &ep->asocs, asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
753 if (!asoc->peer.asconf_capable)
754 continue;
755
756 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
757 continue;
758
759 if (!sctp_state(asoc, ESTABLISHED))
760 continue;
761
762 /* Check if any address in the packed array of addresses is
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900763 * not present in the bind address list of the association.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 * If so, do not send the asconf chunk to its peer, but
765 * continue with other associations.
766 */
767 addr_buf = addrs;
768 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000769 laddr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 af = sctp_get_af_specific(laddr->v4.sin_family);
771 if (!af) {
772 retval = -EINVAL;
773 goto out;
774 }
775
776 if (!sctp_assoc_lookup_laddr(asoc, laddr))
777 break;
778
779 addr_buf += af->sockaddr_len;
780 }
781 if (i < addrcnt)
782 continue;
783
784 /* Find one address in the association's bind address list
785 * that is not in the packed array of addresses. This is to
786 * make sure that we do not delete all the addresses in the
787 * association.
788 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 bp = &asoc->base.bind_addr;
790 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
791 addrcnt, sp);
Michio Honda8a07eb02011-04-26 20:19:36 +0900792 if ((laddr == NULL) && (addrcnt == 1)) {
793 if (asoc->asconf_addr_del_pending)
794 continue;
795 asoc->asconf_addr_del_pending =
796 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
Michio Honda6d65e5e2011-06-10 16:42:14 +0900797 if (asoc->asconf_addr_del_pending == NULL) {
798 retval = -ENOMEM;
799 goto out;
800 }
Michio Honda8a07eb02011-04-26 20:19:36 +0900801 asoc->asconf_addr_del_pending->sa.sa_family =
802 addrs->sa_family;
803 asoc->asconf_addr_del_pending->v4.sin_port =
804 htons(bp->port);
805 if (addrs->sa_family == AF_INET) {
806 struct sockaddr_in *sin;
807
808 sin = (struct sockaddr_in *)addrs;
809 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
810 } else if (addrs->sa_family == AF_INET6) {
811 struct sockaddr_in6 *sin6;
812
813 sin6 = (struct sockaddr_in6 *)addrs;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000814 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
Michio Honda8a07eb02011-04-26 20:19:36 +0900815 }
816 SCTP_DEBUG_PRINTK_IPADDR("send_asconf_del_ip: keep the last address asoc: %p ",
817 " at %p\n", asoc, asoc->asconf_addr_del_pending,
818 asoc->asconf_addr_del_pending);
819 asoc->src_out_of_asoc_ok = 1;
820 stored = 1;
821 goto skip_mkasconf;
822 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823
Daniel Borkmann8ee62e82013-09-07 20:51:21 +0200824 if (laddr == NULL)
825 return -EINVAL;
826
Vlad Yasevich559cf712007-09-16 16:03:28 -0700827 /* We do not need RCU protection throughout this loop
828 * because this is done under a socket lock from the
829 * setsockopt call.
830 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
832 SCTP_PARAM_DEL_IP);
833 if (!chunk) {
834 retval = -ENOMEM;
835 goto out;
836 }
837
Michio Honda8a07eb02011-04-26 20:19:36 +0900838skip_mkasconf:
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700839 /* Reset use_as_src flag for the addresses in the bind address
840 * list that are to be deleted.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 */
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700842 addr_buf = addrs;
843 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000844 laddr = addr_buf;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700845 af = sctp_get_af_specific(laddr->v4.sin_family);
Vlad Yasevich559cf712007-09-16 16:03:28 -0700846 list_for_each_entry(saddr, &bp->address_list, list) {
Al Viro5f242a12006-11-20 17:05:23 -0800847 if (sctp_cmp_addr_exact(&saddr->a, laddr))
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800848 saddr->state = SCTP_ADDR_DEL;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700849 }
850 addr_buf += af->sockaddr_len;
851 }
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700852
853 /* Update the route and saddr entries for all the transports
854 * as some of the addresses in the bind address list are
855 * about to be deleted and cannot be used as source addresses.
856 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700857 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
858 transports) {
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700859 dst_release(transport->dst);
860 sctp_transport_route(transport, NULL,
861 sctp_sk(asoc->base.sk));
862 }
863
Michio Honda8a07eb02011-04-26 20:19:36 +0900864 if (stored)
865 /* We don't need to transmit ASCONF */
866 continue;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700867 retval = sctp_send_asconf(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 }
869out:
870 return retval;
871}
872
Michio Honda9f7d6532011-04-26 19:32:51 +0900873/* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
874int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
875{
876 struct sock *sk = sctp_opt2sk(sp);
877 union sctp_addr *addr;
878 struct sctp_af *af;
879
880 /* It is safe to write port space in caller. */
881 addr = &addrw->a;
882 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
883 af = sctp_get_af_specific(addr->sa.sa_family);
884 if (!af)
885 return -EINVAL;
886 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
887 return -EINVAL;
888
889 if (addrw->state == SCTP_ADDR_NEW)
890 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
891 else
892 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
893}
894
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
896 *
897 * API 8.1
898 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
899 * int flags);
900 *
901 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
902 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
903 * or IPv6 addresses.
904 *
905 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
906 * Section 3.1.2 for this usage.
907 *
908 * addrs is a pointer to an array of one or more socket addresses. Each
909 * address is contained in its appropriate structure (i.e. struct
910 * sockaddr_in or struct sockaddr_in6) the family of the address type
Ville Nuorvala23c435f2006-10-16 22:08:28 -0700911 * must be used to distinguish the address length (note that this
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 * representation is termed a "packed array" of addresses). The caller
913 * specifies the number of addresses in the array with addrcnt.
914 *
915 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
916 * -1, and sets errno to the appropriate error code.
917 *
918 * For SCTP, the port given in each socket address must be the same, or
919 * sctp_bindx() will fail, setting errno to EINVAL.
920 *
921 * The flags parameter is formed from the bitwise OR of zero or more of
922 * the following currently defined flags:
923 *
924 * SCTP_BINDX_ADD_ADDR
925 *
926 * SCTP_BINDX_REM_ADDR
927 *
928 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
929 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
930 * addresses from the association. The two flags are mutually exclusive;
931 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
932 * not remove all addresses from an association; sctp_bindx() will
933 * reject such an attempt with EINVAL.
934 *
935 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
936 * additional addresses with an endpoint after calling bind(). Or use
937 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
938 * socket is associated with so that no new association accepted will be
939 * associated with those addresses. If the endpoint supports dynamic
940 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
941 * endpoint to send the appropriate message to the peer to change the
942 * peers address lists.
943 *
944 * Adding and removing addresses from a connected association is
945 * optional functionality. Implementations that do not support this
946 * functionality should return EOPNOTSUPP.
947 *
948 * Basically do nothing but copying the addresses from user to kernel
949 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
Frank Filz3f7a87d2005-06-20 13:14:57 -0700950 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
951 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 *
953 * We don't use copy_from_user() for optimization: we first do the
954 * sanity checks (buffer size -fast- and access check-healthy
955 * pointer); if all of those succeed, then we can alloc the memory
956 * (expensive operation) needed to copy the data to kernel. Then we do
957 * the copying without checking the user space area
958 * (__copy_from_user()).
959 *
960 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
961 * it.
962 *
963 * sk The sk of the socket
964 * addrs The pointer to the addresses in user land
965 * addrssize Size of the addrs buffer
966 * op Operation to perform (add or remove, see the flags of
967 * sctp_bindx)
968 *
969 * Returns 0 if ok, <0 errno code on error.
970 */
971SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk,
972 struct sockaddr __user *addrs,
973 int addrs_size, int op)
974{
975 struct sockaddr *kaddrs;
976 int err;
977 int addrcnt = 0;
978 int walk_size = 0;
979 struct sockaddr *sa_addr;
980 void *addr_buf;
981 struct sctp_af *af;
982
Masanari Iidad3e9a1d2012-10-31 05:48:19 +0000983 SCTP_DEBUG_PRINTK("sctp_setsockopt_bindx: sk %p addrs %p"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
985
986 if (unlikely(addrs_size <= 0))
987 return -EINVAL;
988
989 /* Check the user passed a healthy pointer. */
990 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
991 return -EFAULT;
992
993 /* Alloc space for the address array in kernel memory. */
Kris Katterjohn8b3a7002006-01-11 15:56:43 -0800994 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 if (unlikely(!kaddrs))
996 return -ENOMEM;
997
998 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
999 kfree(kaddrs);
1000 return -EFAULT;
1001 }
1002
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001003 /* Walk through the addrs buffer and count the number of addresses. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 addr_buf = kaddrs;
1005 while (walk_size < addrs_size) {
Dan Rosenbergd7e0d192010-10-01 11:16:58 +00001006 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1007 kfree(kaddrs);
1008 return -EINVAL;
1009 }
1010
Joe Perchesea110732011-06-13 16:21:26 +00001011 sa_addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 af = sctp_get_af_specific(sa_addr->sa_family);
1013
1014 /* If the address family is not supported or if this address
1015 * causes the address buffer to overflow return EINVAL.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001016 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1018 kfree(kaddrs);
1019 return -EINVAL;
1020 }
1021 addrcnt++;
1022 addr_buf += af->sockaddr_len;
1023 walk_size += af->sockaddr_len;
1024 }
1025
1026 /* Do the work. */
1027 switch (op) {
1028 case SCTP_BINDX_ADD_ADDR:
1029 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1030 if (err)
1031 goto out;
1032 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1033 break;
1034
1035 case SCTP_BINDX_REM_ADDR:
1036 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1037 if (err)
1038 goto out;
1039 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1040 break;
1041
1042 default:
1043 err = -EINVAL;
1044 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001045 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
1047out:
1048 kfree(kaddrs);
1049
1050 return err;
1051}
1052
Frank Filz3f7a87d2005-06-20 13:14:57 -07001053/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1054 *
1055 * Common routine for handling connect() and sctp_connectx().
1056 * Connect will come in with just a single address.
1057 */
1058static int __sctp_connect(struct sock* sk,
1059 struct sockaddr *kaddrs,
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001060 int addrs_size,
1061 sctp_assoc_t *assoc_id)
Frank Filz3f7a87d2005-06-20 13:14:57 -07001062{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001063 struct net *net = sock_net(sk);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001064 struct sctp_sock *sp;
1065 struct sctp_endpoint *ep;
1066 struct sctp_association *asoc = NULL;
1067 struct sctp_association *asoc2;
1068 struct sctp_transport *transport;
1069 union sctp_addr to;
1070 struct sctp_af *af;
1071 sctp_scope_t scope;
1072 long timeo;
1073 int err = 0;
1074 int addrcnt = 0;
1075 int walk_size = 0;
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001076 union sctp_addr *sa_addr = NULL;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001077 void *addr_buf;
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001078 unsigned short port;
Vlad Yasevichf50f95c2007-07-03 12:47:40 -04001079 unsigned int f_flags = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001080
1081 sp = sctp_sk(sk);
1082 ep = sp->ep;
1083
1084 /* connect() cannot be done on a socket that is already in ESTABLISHED
1085 * state - UDP-style peeled off socket or a TCP-style socket that
1086 * is already connected.
1087 * It cannot be done even on a TCP-style listening socket.
1088 */
1089 if (sctp_sstate(sk, ESTABLISHED) ||
1090 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1091 err = -EISCONN;
1092 goto out_free;
1093 }
1094
1095 /* Walk through the addrs buffer and count the number of addresses. */
1096 addr_buf = kaddrs;
1097 while (walk_size < addrs_size) {
Dan Rosenbergd7e0d192010-10-01 11:16:58 +00001098 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1099 err = -EINVAL;
1100 goto out_free;
1101 }
1102
Joe Perchesea110732011-06-13 16:21:26 +00001103 sa_addr = addr_buf;
Al Viro4bdf4b52006-11-20 17:10:20 -08001104 af = sctp_get_af_specific(sa_addr->sa.sa_family);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001105
1106 /* If the address family is not supported or if this address
1107 * causes the address buffer to overflow return EINVAL.
1108 */
1109 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1110 err = -EINVAL;
1111 goto out_free;
1112 }
1113
Dan Rosenbergd7e0d192010-10-01 11:16:58 +00001114 port = ntohs(sa_addr->v4.sin_port);
1115
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001116 /* Save current address so we can work with it */
1117 memcpy(&to, sa_addr, af->sockaddr_len);
1118
1119 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001120 if (err)
1121 goto out_free;
1122
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001123 /* Make sure the destination port is correctly set
1124 * in all addresses.
1125 */
Wei Yongjun524fba62013-04-03 03:02:28 +00001126 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1127 err = -EINVAL;
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001128 goto out_free;
Wei Yongjun524fba62013-04-03 03:02:28 +00001129 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001130
1131 /* Check if there already is a matching association on the
1132 * endpoint (other than the one created here).
1133 */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001134 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001135 if (asoc2 && asoc2 != asoc) {
1136 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1137 err = -EISCONN;
1138 else
1139 err = -EALREADY;
1140 goto out_free;
1141 }
1142
1143 /* If we could not find a matching association on the endpoint,
1144 * make sure that there is no peeled-off association matching
1145 * the peer address even on another socket.
1146 */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001147 if (sctp_endpoint_is_peeled_off(ep, &to)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -07001148 err = -EADDRNOTAVAIL;
1149 goto out_free;
1150 }
1151
1152 if (!asoc) {
1153 /* If a bind() or sctp_bindx() is not called prior to
1154 * an sctp_connectx() call, the system picks an
1155 * ephemeral port and will choose an address set
1156 * equivalent to binding with a wildcard address.
1157 */
1158 if (!ep->base.bind_addr.port) {
1159 if (sctp_autobind(sk)) {
1160 err = -EAGAIN;
1161 goto out_free;
1162 }
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001163 } else {
1164 /*
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001165 * If an unprivileged user inherits a 1-many
1166 * style socket with open associations on a
1167 * privileged port, it MAY be permitted to
1168 * accept new associations, but it SHOULD NOT
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001169 * be permitted to open new associations.
1170 */
1171 if (ep->base.bind_addr.port < PROT_SOCK &&
Eric W. Biederman35946982012-11-16 03:03:12 +00001172 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001173 err = -EACCES;
1174 goto out_free;
1175 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001176 }
1177
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001178 scope = sctp_scope(&to);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001179 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1180 if (!asoc) {
1181 err = -ENOMEM;
1182 goto out_free;
1183 }
Vlad Yasevich409b95a2009-11-10 08:57:34 +00001184
1185 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1186 GFP_KERNEL);
1187 if (err < 0) {
1188 goto out_free;
1189 }
1190
Frank Filz3f7a87d2005-06-20 13:14:57 -07001191 }
1192
1193 /* Prime the peer's transport structures. */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001194 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001195 SCTP_UNKNOWN);
1196 if (!transport) {
1197 err = -ENOMEM;
1198 goto out_free;
1199 }
1200
1201 addrcnt++;
1202 addr_buf += af->sockaddr_len;
1203 walk_size += af->sockaddr_len;
1204 }
1205
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001206 /* In case the user of sctp_connectx() wants an association
1207 * id back, assign one now.
1208 */
1209 if (assoc_id) {
1210 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1211 if (err < 0)
1212 goto out_free;
1213 }
1214
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001215 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001216 if (err < 0) {
1217 goto out_free;
1218 }
1219
1220 /* Initialize sk's dport and daddr for getpeername() */
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001221 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001222 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1223 af->to_sk_daddr(sa_addr, sk);
Sridhar Samudrala8de8c872006-05-19 10:58:12 -07001224 sk->sk_err = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001225
Vlad Yasevichf50f95c2007-07-03 12:47:40 -04001226 /* in-kernel sockets don't generally have a file allocated to them
1227 * if all they do is call sock_create_kern().
1228 */
1229 if (sk->sk_socket->file)
1230 f_flags = sk->sk_socket->file->f_flags;
1231
1232 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1233
Frank Filz3f7a87d2005-06-20 13:14:57 -07001234 err = sctp_wait_for_connect(asoc, &timeo);
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001235 if ((err == 0 || err == -EINPROGRESS) && assoc_id)
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001236 *assoc_id = asoc->assoc_id;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001237
1238 /* Don't free association on exit. */
1239 asoc = NULL;
1240
1241out_free:
1242
1243 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001244 " kaddrs: %p err: %d\n",
1245 asoc, kaddrs, err);
Neil Horman2eebc1e2012-07-16 09:13:51 +00001246 if (asoc) {
1247 /* sctp_primitive_ASSOCIATE may have added this association
1248 * To the hash table, try to unhash it, just in case, its a noop
1249 * if it wasn't hashed so we're safe
1250 */
1251 sctp_unhash_established(asoc);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001252 sctp_association_free(asoc);
Neil Horman2eebc1e2012-07-16 09:13:51 +00001253 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001254 return err;
1255}
1256
1257/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1258 *
1259 * API 8.9
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001260 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1261 * sctp_assoc_t *asoc);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001262 *
1263 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1264 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1265 * or IPv6 addresses.
1266 *
1267 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1268 * Section 3.1.2 for this usage.
1269 *
1270 * addrs is a pointer to an array of one or more socket addresses. Each
1271 * address is contained in its appropriate structure (i.e. struct
1272 * sockaddr_in or struct sockaddr_in6) the family of the address type
1273 * must be used to distengish the address length (note that this
1274 * representation is termed a "packed array" of addresses). The caller
1275 * specifies the number of addresses in the array with addrcnt.
1276 *
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001277 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1278 * the association id of the new association. On failure, sctp_connectx()
1279 * returns -1, and sets errno to the appropriate error code. The assoc_id
1280 * is not touched by the kernel.
Frank Filz3f7a87d2005-06-20 13:14:57 -07001281 *
1282 * For SCTP, the port given in each socket address must be the same, or
1283 * sctp_connectx() will fail, setting errno to EINVAL.
1284 *
1285 * An application can use sctp_connectx to initiate an association with
1286 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1287 * allows a caller to specify multiple addresses at which a peer can be
1288 * reached. The way the SCTP stack uses the list of addresses to set up
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001289 * the association is implementation dependent. This function only
Frank Filz3f7a87d2005-06-20 13:14:57 -07001290 * specifies that the stack will try to make use of all the addresses in
1291 * the list when needed.
1292 *
1293 * Note that the list of addresses passed in is only used for setting up
1294 * the association. It does not necessarily equal the set of addresses
1295 * the peer uses for the resulting association. If the caller wants to
1296 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1297 * retrieve them after the association has been set up.
1298 *
1299 * Basically do nothing but copying the addresses from user to kernel
1300 * land and invoking either sctp_connectx(). This is used for tunneling
1301 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1302 *
1303 * We don't use copy_from_user() for optimization: we first do the
1304 * sanity checks (buffer size -fast- and access check-healthy
1305 * pointer); if all of those succeed, then we can alloc the memory
1306 * (expensive operation) needed to copy the data to kernel. Then we do
1307 * the copying without checking the user space area
1308 * (__copy_from_user()).
1309 *
1310 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1311 * it.
1312 *
1313 * sk The sk of the socket
1314 * addrs The pointer to the addresses in user land
1315 * addrssize Size of the addrs buffer
1316 *
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001317 * Returns >=0 if ok, <0 errno code on error.
Frank Filz3f7a87d2005-06-20 13:14:57 -07001318 */
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001319SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001320 struct sockaddr __user *addrs,
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001321 int addrs_size,
1322 sctp_assoc_t *assoc_id)
Frank Filz3f7a87d2005-06-20 13:14:57 -07001323{
1324 int err = 0;
1325 struct sockaddr *kaddrs;
1326
1327 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -08001328 __func__, sk, addrs, addrs_size);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001329
1330 if (unlikely(addrs_size <= 0))
1331 return -EINVAL;
1332
1333 /* Check the user passed a healthy pointer. */
1334 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1335 return -EFAULT;
1336
1337 /* Alloc space for the address array in kernel memory. */
Kris Katterjohn8b3a7002006-01-11 15:56:43 -08001338 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001339 if (unlikely(!kaddrs))
1340 return -ENOMEM;
1341
1342 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1343 err = -EFAULT;
1344 } else {
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001345 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001346 }
1347
1348 kfree(kaddrs);
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001349
Frank Filz3f7a87d2005-06-20 13:14:57 -07001350 return err;
1351}
1352
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001353/*
1354 * This is an older interface. It's kept for backward compatibility
1355 * to the option that doesn't provide association id.
1356 */
1357SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk,
1358 struct sockaddr __user *addrs,
1359 int addrs_size)
1360{
1361 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1362}
1363
1364/*
1365 * New interface for the API. The since the API is done with a socket
1366 * option, to make it simple we feed back the association id is as a return
1367 * indication to the call. Error is always negative and association id is
1368 * always positive.
1369 */
1370SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
1371 struct sockaddr __user *addrs,
1372 int addrs_size)
1373{
1374 sctp_assoc_t assoc_id = 0;
1375 int err = 0;
1376
1377 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1378
1379 if (err)
1380 return err;
1381 else
1382 return assoc_id;
1383}
1384
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001385/*
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001386 * New (hopefully final) interface for the API.
1387 * We use the sctp_getaddrs_old structure so that use-space library
Daniel Borkmannb306713b2014-02-17 12:11:11 +01001388 * can avoid any unnecessary allocations. The only different part
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001389 * is that we store the actual length of the address buffer into the
Daniel Borkmannb306713b2014-02-17 12:11:11 +01001390 * addrs_num structure member. That way we can re-use the existing
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001391 * code.
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001392 */
Daniel Borkmannb306713b2014-02-17 12:11:11 +01001393#ifdef CONFIG_COMPAT
1394struct compat_sctp_getaddrs_old {
1395 sctp_assoc_t assoc_id;
1396 s32 addr_num;
1397 compat_uptr_t addrs; /* struct sockaddr * */
1398};
1399#endif
1400
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001401SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len,
1402 char __user *optval,
1403 int __user *optlen)
1404{
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001405 struct sctp_getaddrs_old param;
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001406 sctp_assoc_t assoc_id = 0;
1407 int err = 0;
1408
Daniel Borkmannb306713b2014-02-17 12:11:11 +01001409#ifdef CONFIG_COMPAT
1410 if (is_compat_task()) {
1411 struct compat_sctp_getaddrs_old param32;
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001412
Daniel Borkmannb306713b2014-02-17 12:11:11 +01001413 if (len < sizeof(param32))
1414 return -EINVAL;
1415 if (copy_from_user(&param32, optval, sizeof(param32)))
1416 return -EFAULT;
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001417
Daniel Borkmannb306713b2014-02-17 12:11:11 +01001418 param.assoc_id = param32.assoc_id;
1419 param.addr_num = param32.addr_num;
1420 param.addrs = compat_ptr(param32.addrs);
1421 } else
1422#endif
1423 {
1424 if (len < sizeof(param))
1425 return -EINVAL;
1426 if (copy_from_user(&param, optval, sizeof(param)))
1427 return -EFAULT;
1428 }
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001429
Daniel Borkmannb306713b2014-02-17 12:11:11 +01001430 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1431 param.addrs, param.addr_num,
1432 &assoc_id);
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001433 if (err == 0 || err == -EINPROGRESS) {
1434 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1435 return -EFAULT;
1436 if (put_user(sizeof(assoc_id), optlen))
1437 return -EFAULT;
1438 }
1439
1440 return err;
1441}
1442
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443/* API 3.1.4 close() - UDP Style Syntax
1444 * Applications use close() to perform graceful shutdown (as described in
1445 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1446 * by a UDP-style socket.
1447 *
1448 * The syntax is
1449 *
1450 * ret = close(int sd);
1451 *
1452 * sd - the socket descriptor of the associations to be closed.
1453 *
1454 * To gracefully shutdown a specific association represented by the
1455 * UDP-style socket, an application should use the sendmsg() call,
1456 * passing no user data, but including the appropriate flag in the
1457 * ancillary data (see Section xxxx).
1458 *
1459 * If sd in the close() call is a branched-off socket representing only
1460 * one association, the shutdown is performed on that association only.
1461 *
1462 * 4.1.6 close() - TCP Style Syntax
1463 *
1464 * Applications use close() to gracefully close down an association.
1465 *
1466 * The syntax is:
1467 *
1468 * int close(int sd);
1469 *
1470 * sd - the socket descriptor of the association to be closed.
1471 *
1472 * After an application calls close() on a socket descriptor, no further
1473 * socket operations will succeed on that descriptor.
1474 *
1475 * API 7.1.4 SO_LINGER
1476 *
1477 * An application using the TCP-style socket can use this option to
1478 * perform the SCTP ABORT primitive. The linger option structure is:
1479 *
1480 * struct linger {
1481 * int l_onoff; // option on/off
1482 * int l_linger; // linger time
1483 * };
1484 *
1485 * To enable the option, set l_onoff to 1. If the l_linger value is set
1486 * to 0, calling close() is the same as the ABORT primitive. If the
1487 * value is set to a negative value, the setsockopt() call will return
1488 * an error. If the value is set to a positive value linger_time, the
1489 * close() can be blocked for at most linger_time ms. If the graceful
1490 * shutdown phase does not finish during this period, close() will
1491 * return but the graceful shutdown phase continues in the system.
1492 */
1493SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
1494{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001495 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 struct sctp_endpoint *ep;
1497 struct sctp_association *asoc;
1498 struct list_head *pos, *temp;
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001499 unsigned int data_was_unread;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500
1501 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
1502
1503 sctp_lock_sock(sk);
1504 sk->sk_shutdown = SHUTDOWN_MASK;
Vlad Yasevichbec96402009-07-30 18:08:28 -04001505 sk->sk_state = SCTP_SS_CLOSING;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506
1507 ep = sctp_sk(sk)->ep;
1508
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001509 /* Clean up any skbs sitting on the receive queue. */
1510 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1511 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1512
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07001513 /* Walk all associations on an endpoint. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 list_for_each_safe(pos, temp, &ep->asocs) {
1515 asoc = list_entry(pos, struct sctp_association, asocs);
1516
1517 if (sctp_style(sk, TCP)) {
1518 /* A closed association can still be in the list if
1519 * it belongs to a TCP-style listening socket that is
1520 * not yet accepted. If so, free it. If not, send an
1521 * ABORT or SHUTDOWN based on the linger options.
1522 */
1523 if (sctp_state(asoc, CLOSED)) {
1524 sctp_unhash_established(asoc);
1525 sctp_association_free(asoc);
Vladislav Yasevichb89498a2006-05-19 14:32:06 -07001526 continue;
1527 }
1528 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001530 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1531 !skb_queue_empty(&asoc->ulpq.reasm) ||
1532 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
Sridhar Samudralab9ac8672006-08-28 13:53:01 -07001533 struct sctp_chunk *chunk;
1534
1535 chunk = sctp_make_abort_user(asoc, NULL, 0);
1536 if (chunk)
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001537 sctp_primitive_ABORT(net, asoc, chunk);
Sridhar Samudralab9ac8672006-08-28 13:53:01 -07001538 } else
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001539 sctp_primitive_SHUTDOWN(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 }
1541
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 /* On a TCP-style socket, block for at most linger_time if set. */
1543 if (sctp_style(sk, TCP) && timeout)
1544 sctp_wait_for_close(sk, timeout);
1545
1546 /* This will run the backlog queue. */
1547 sctp_release_sock(sk);
1548
1549 /* Supposedly, no process has access to the socket, but
1550 * the net layers still may.
1551 */
1552 sctp_local_bh_disable();
1553 sctp_bh_lock_sock(sk);
1554
1555 /* Hold the sock, since sk_common_release() will put sock_put()
1556 * and we have just a little more cleanup.
1557 */
1558 sock_hold(sk);
1559 sk_common_release(sk);
1560
1561 sctp_bh_unlock_sock(sk);
1562 sctp_local_bh_enable();
1563
1564 sock_put(sk);
1565
1566 SCTP_DBG_OBJCNT_DEC(sock);
1567}
1568
1569/* Handle EPIPE error. */
1570static int sctp_error(struct sock *sk, int flags, int err)
1571{
1572 if (err == -EPIPE)
1573 err = sock_error(sk) ? : -EPIPE;
1574 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1575 send_sig(SIGPIPE, current, 0);
1576 return err;
1577}
1578
1579/* API 3.1.3 sendmsg() - UDP Style Syntax
1580 *
1581 * An application uses sendmsg() and recvmsg() calls to transmit data to
1582 * and receive data from its peer.
1583 *
1584 * ssize_t sendmsg(int socket, const struct msghdr *message,
1585 * int flags);
1586 *
1587 * socket - the socket descriptor of the endpoint.
1588 * message - pointer to the msghdr structure which contains a single
1589 * user message and possibly some ancillary data.
1590 *
1591 * See Section 5 for complete description of the data
1592 * structures.
1593 *
1594 * flags - flags sent or received with the user message, see Section
1595 * 5 for complete description of the flags.
1596 *
1597 * Note: This function could use a rewrite especially when explicit
1598 * connect support comes in.
1599 */
1600/* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1601
1602SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1603
1604SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1605 struct msghdr *msg, size_t msg_len)
1606{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001607 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 struct sctp_sock *sp;
1609 struct sctp_endpoint *ep;
1610 struct sctp_association *new_asoc=NULL, *asoc=NULL;
1611 struct sctp_transport *transport, *chunk_tp;
1612 struct sctp_chunk *chunk;
Al Virodce116a2006-11-20 17:25:15 -08001613 union sctp_addr to;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 struct sockaddr *msg_name = NULL;
Joe Perches517aa0b2011-05-12 11:27:20 +00001615 struct sctp_sndrcvinfo default_sinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 struct sctp_sndrcvinfo *sinfo;
1617 struct sctp_initmsg *sinit;
1618 sctp_assoc_t associd = 0;
1619 sctp_cmsgs_t cmsgs = { NULL };
1620 int err;
1621 sctp_scope_t scope;
1622 long timeo;
1623 __u16 sinfo_flags = 0;
1624 struct sctp_datamsg *datamsg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625 int msg_flags = msg->msg_flags;
1626
1627 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1628 sk, msg, msg_len);
1629
1630 err = 0;
1631 sp = sctp_sk(sk);
1632 ep = sp->ep;
1633
Frank Filz3f7a87d2005-06-20 13:14:57 -07001634 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635
1636 /* We cannot send a message over a TCP-style listening socket. */
1637 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1638 err = -EPIPE;
1639 goto out_nounlock;
1640 }
1641
1642 /* Parse out the SCTP CMSGs. */
1643 err = sctp_msghdr_parse(msg, &cmsgs);
1644
1645 if (err) {
1646 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
1647 goto out_nounlock;
1648 }
1649
1650 /* Fetch the destination address for this packet. This
1651 * address only selects the association--it is not necessarily
1652 * the address we will send to.
1653 * For a peeled-off socket, msg_name is ignored.
1654 */
1655 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1656 int msg_namelen = msg->msg_namelen;
1657
1658 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1659 msg_namelen);
1660 if (err)
1661 return err;
1662
1663 if (msg_namelen > sizeof(to))
1664 msg_namelen = sizeof(to);
1665 memcpy(&to, msg->msg_name, msg_namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 msg_name = msg->msg_name;
1667 }
1668
1669 sinfo = cmsgs.info;
1670 sinit = cmsgs.init;
1671
1672 /* Did the user specify SNDRCVINFO? */
1673 if (sinfo) {
1674 sinfo_flags = sinfo->sinfo_flags;
1675 associd = sinfo->sinfo_assoc_id;
1676 }
1677
1678 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1679 msg_len, sinfo_flags);
1680
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001681 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1682 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683 err = -EINVAL;
1684 goto out_nounlock;
1685 }
1686
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001687 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1688 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1689 * If SCTP_ABORT is set, the message length could be non zero with
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 * the msg_iov set to the user abort reason.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001691 */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001692 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1693 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694 err = -EINVAL;
1695 goto out_nounlock;
1696 }
1697
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001698 /* If SCTP_ADDR_OVER is set, there must be an address
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 * specified in msg_name.
1700 */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001701 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702 err = -EINVAL;
1703 goto out_nounlock;
1704 }
1705
1706 transport = NULL;
1707
1708 SCTP_DEBUG_PRINTK("About to look up association.\n");
1709
1710 sctp_lock_sock(sk);
1711
1712 /* If a msg_name has been specified, assume this is to be used. */
1713 if (msg_name) {
1714 /* Look for a matching association on the endpoint. */
Al Virodce116a2006-11-20 17:25:15 -08001715 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716 if (!asoc) {
1717 /* If we could not find a matching association on the
1718 * endpoint, make sure that it is not a TCP-style
1719 * socket that already has an association or there is
1720 * no peeled-off association on another socket.
1721 */
1722 if ((sctp_style(sk, TCP) &&
1723 sctp_sstate(sk, ESTABLISHED)) ||
Al Virodce116a2006-11-20 17:25:15 -08001724 sctp_endpoint_is_peeled_off(ep, &to)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 err = -EADDRNOTAVAIL;
1726 goto out_unlock;
1727 }
1728 }
1729 } else {
1730 asoc = sctp_id2assoc(sk, associd);
1731 if (!asoc) {
1732 err = -EPIPE;
1733 goto out_unlock;
1734 }
1735 }
1736
1737 if (asoc) {
1738 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
1739
1740 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1741 * socket that has an association in CLOSED state. This can
1742 * happen when an accepted socket has an association that is
1743 * already CLOSED.
1744 */
1745 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1746 err = -EPIPE;
1747 goto out_unlock;
1748 }
1749
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001750 if (sinfo_flags & SCTP_EOF) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1752 asoc);
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001753 sctp_primitive_SHUTDOWN(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 err = 0;
1755 goto out_unlock;
1756 }
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001757 if (sinfo_flags & SCTP_ABORT) {
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001758
1759 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1760 if (!chunk) {
1761 err = -ENOMEM;
1762 goto out_unlock;
1763 }
1764
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001766 sctp_primitive_ABORT(net, asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767 err = 0;
1768 goto out_unlock;
1769 }
1770 }
1771
1772 /* Do we need to create the association? */
1773 if (!asoc) {
1774 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1775
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001776 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 err = -EINVAL;
1778 goto out_unlock;
1779 }
1780
1781 /* Check for invalid stream against the stream counts,
1782 * either the default or the user specified stream counts.
1783 */
1784 if (sinfo) {
1785 if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1786 /* Check against the defaults. */
1787 if (sinfo->sinfo_stream >=
1788 sp->initmsg.sinit_num_ostreams) {
1789 err = -EINVAL;
1790 goto out_unlock;
1791 }
1792 } else {
1793 /* Check against the requested. */
1794 if (sinfo->sinfo_stream >=
1795 sinit->sinit_num_ostreams) {
1796 err = -EINVAL;
1797 goto out_unlock;
1798 }
1799 }
1800 }
1801
1802 /*
1803 * API 3.1.2 bind() - UDP Style Syntax
1804 * If a bind() or sctp_bindx() is not called prior to a
1805 * sendmsg() call that initiates a new association, the
1806 * system picks an ephemeral port and will choose an address
1807 * set equivalent to binding with a wildcard address.
1808 */
1809 if (!ep->base.bind_addr.port) {
1810 if (sctp_autobind(sk)) {
1811 err = -EAGAIN;
1812 goto out_unlock;
1813 }
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001814 } else {
1815 /*
1816 * If an unprivileged user inherits a one-to-many
1817 * style socket with open associations on a privileged
1818 * port, it MAY be permitted to accept new associations,
1819 * but it SHOULD NOT be permitted to open new
1820 * associations.
1821 */
1822 if (ep->base.bind_addr.port < PROT_SOCK &&
Eric W. Biederman35946982012-11-16 03:03:12 +00001823 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001824 err = -EACCES;
1825 goto out_unlock;
1826 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827 }
1828
1829 scope = sctp_scope(&to);
1830 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1831 if (!new_asoc) {
1832 err = -ENOMEM;
1833 goto out_unlock;
1834 }
1835 asoc = new_asoc;
Vlad Yasevich409b95a2009-11-10 08:57:34 +00001836 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1837 if (err < 0) {
1838 err = -ENOMEM;
1839 goto out_free;
1840 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841
1842 /* If the SCTP_INIT ancillary data is specified, set all
1843 * the association init values accordingly.
1844 */
1845 if (sinit) {
1846 if (sinit->sinit_num_ostreams) {
1847 asoc->c.sinit_num_ostreams =
1848 sinit->sinit_num_ostreams;
1849 }
1850 if (sinit->sinit_max_instreams) {
1851 asoc->c.sinit_max_instreams =
1852 sinit->sinit_max_instreams;
1853 }
1854 if (sinit->sinit_max_attempts) {
1855 asoc->max_init_attempts
1856 = sinit->sinit_max_attempts;
1857 }
1858 if (sinit->sinit_max_init_timeo) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001859 asoc->max_init_timeo =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1861 }
1862 }
1863
1864 /* Prime the peer's transport structures. */
Al Virodce116a2006-11-20 17:25:15 -08001865 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866 if (!transport) {
1867 err = -ENOMEM;
1868 goto out_free;
1869 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870 }
1871
1872 /* ASSERT: we have a valid association at this point. */
1873 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1874
1875 if (!sinfo) {
1876 /* If the user didn't specify SNDRCVINFO, make up one with
1877 * some defaults.
1878 */
Joe Perches517aa0b2011-05-12 11:27:20 +00001879 memset(&default_sinfo, 0, sizeof(default_sinfo));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880 default_sinfo.sinfo_stream = asoc->default_stream;
1881 default_sinfo.sinfo_flags = asoc->default_flags;
1882 default_sinfo.sinfo_ppid = asoc->default_ppid;
1883 default_sinfo.sinfo_context = asoc->default_context;
1884 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1885 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1886 sinfo = &default_sinfo;
1887 }
1888
1889 /* API 7.1.7, the sndbuf size per association bounds the
1890 * maximum size of data that can be sent in a single send call.
1891 */
1892 if (msg_len > sk->sk_sndbuf) {
1893 err = -EMSGSIZE;
1894 goto out_free;
1895 }
1896
Vlad Yasevich8a479492007-06-07 14:21:05 -04001897 if (asoc->pmtu_pending)
David S. Miller02f3d4c2012-07-16 03:57:14 -07001898 sctp_assoc_pending_pmtu(sk, asoc);
Vlad Yasevich8a479492007-06-07 14:21:05 -04001899
Linus Torvalds1da177e2005-04-16 15:20:36 -07001900 /* If fragmentation is disabled and the message length exceeds the
1901 * association fragmentation point, return EMSGSIZE. The I-D
1902 * does not specify what this error is, but this looks like
1903 * a great fit.
1904 */
1905 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1906 err = -EMSGSIZE;
1907 goto out_free;
1908 }
1909
Joe Perchesafd76142011-05-12 09:19:10 +00001910 /* Check for invalid stream. */
1911 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1912 err = -EINVAL;
1913 goto out_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 }
1915
1916 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1917 if (!sctp_wspace(asoc)) {
1918 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1919 if (err)
1920 goto out_free;
1921 }
1922
1923 /* If an address is passed with the sendto/sendmsg call, it is used
1924 * to override the primary destination address in the TCP model, or
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001925 * when SCTP_ADDR_OVER flag is set in the UDP model.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 */
1927 if ((sctp_style(sk, TCP) && msg_name) ||
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001928 (sinfo_flags & SCTP_ADDR_OVER)) {
Al Virodce116a2006-11-20 17:25:15 -08001929 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930 if (!chunk_tp) {
1931 err = -EINVAL;
1932 goto out_free;
1933 }
1934 } else
1935 chunk_tp = NULL;
1936
1937 /* Auto-connect, if we aren't connected already. */
1938 if (sctp_state(asoc, CLOSED)) {
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001939 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940 if (err < 0)
1941 goto out_free;
1942 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1943 }
1944
1945 /* Break the message into multiple chunks of maximum size. */
1946 datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
Tommi Rantala6e51fe72012-11-22 03:23:16 +00001947 if (IS_ERR(datamsg)) {
1948 err = PTR_ERR(datamsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 goto out_free;
1950 }
1951
1952 /* Now send the (possibly) fragmented message. */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07001953 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
Florian Westphal80445cf2008-03-23 22:47:08 -07001954 sctp_chunk_hold(chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001955
1956 /* Do accounting for the write space. */
1957 sctp_set_owner_w(chunk);
1958
1959 chunk->transport = chunk_tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001960 }
1961
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001962 /* Send it to the lower layers. Note: all chunks
1963 * must either fail or succeed. The lower layer
1964 * works that way today. Keep it that way or this
1965 * breaks.
1966 */
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00001967 err = sctp_primitive_SEND(net, asoc, datamsg);
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001968 /* Did the lower layer accept the chunk? */
1969 if (err)
1970 sctp_datamsg_free(datamsg);
1971 else
1972 sctp_datamsg_put(datamsg);
1973
1974 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1975
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976 if (err)
1977 goto out_free;
1978 else
1979 err = msg_len;
1980
1981 /* If we are already past ASSOCIATE, the lower
1982 * layers are responsible for association cleanup.
1983 */
1984 goto out_unlock;
1985
1986out_free:
Neil Horman2eebc1e2012-07-16 09:13:51 +00001987 if (new_asoc) {
1988 sctp_unhash_established(asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989 sctp_association_free(asoc);
Neil Horman2eebc1e2012-07-16 09:13:51 +00001990 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991out_unlock:
1992 sctp_release_sock(sk);
1993
1994out_nounlock:
1995 return sctp_error(sk, msg_flags, err);
1996
1997#if 0
1998do_sock_err:
1999 if (msg_len)
2000 err = msg_len;
2001 else
2002 err = sock_error(sk);
2003 goto out;
2004
2005do_interrupted:
2006 if (msg_len)
2007 err = msg_len;
2008 goto out;
2009#endif /* 0 */
2010}
2011
2012/* This is an extended version of skb_pull() that removes the data from the
2013 * start of a skb even when data is spread across the list of skb's in the
2014 * frag_list. len specifies the total amount of data that needs to be removed.
2015 * when 'len' bytes could be removed from the skb, it returns 0.
2016 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2017 * could not be removed.
2018 */
2019static int sctp_skb_pull(struct sk_buff *skb, int len)
2020{
2021 struct sk_buff *list;
2022 int skb_len = skb_headlen(skb);
2023 int rlen;
2024
2025 if (len <= skb_len) {
2026 __skb_pull(skb, len);
2027 return 0;
2028 }
2029 len -= skb_len;
2030 __skb_pull(skb, skb_len);
2031
David S. Miller1b003be2009-06-09 00:22:35 -07002032 skb_walk_frags(skb, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033 rlen = sctp_skb_pull(list, len);
2034 skb->len -= (len-rlen);
2035 skb->data_len -= (len-rlen);
2036
2037 if (!rlen)
2038 return 0;
2039
2040 len = rlen;
2041 }
2042
2043 return len;
2044}
2045
2046/* API 3.1.3 recvmsg() - UDP Style Syntax
2047 *
2048 * ssize_t recvmsg(int socket, struct msghdr *message,
2049 * int flags);
2050 *
2051 * socket - the socket descriptor of the endpoint.
2052 * message - pointer to the msghdr structure which contains a single
2053 * user message and possibly some ancillary data.
2054 *
2055 * See Section 5 for complete description of the data
2056 * structures.
2057 *
2058 * flags - flags sent or received with the user message, see Section
2059 * 5 for complete description of the flags.
2060 */
2061static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
2062
2063SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
2064 struct msghdr *msg, size_t len, int noblock,
2065 int flags, int *addr_len)
2066{
2067 struct sctp_ulpevent *event = NULL;
2068 struct sctp_sock *sp = sctp_sk(sk);
2069 struct sk_buff *skb;
2070 int copied;
2071 int err = 0;
2072 int skb_len;
2073
2074 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
2075 "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
2076 "len", len, "knoblauch", noblock,
2077 "flags", flags, "addr_len", addr_len);
2078
2079 sctp_lock_sock(sk);
2080
2081 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2082 err = -ENOTCONN;
2083 goto out;
2084 }
2085
2086 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2087 if (!skb)
2088 goto out;
2089
2090 /* Get the total length of the skb including any skb's in the
2091 * frag_list.
2092 */
2093 skb_len = skb->len;
2094
2095 copied = skb_len;
2096 if (copied > len)
2097 copied = len;
2098
2099 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2100
2101 event = sctp_skb2event(skb);
2102
2103 if (err)
2104 goto out_free;
2105
Neil Horman3b885782009-10-12 13:26:31 -07002106 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107 if (sctp_ulpevent_is_notification(event)) {
2108 msg->msg_flags |= MSG_NOTIFICATION;
2109 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2110 } else {
2111 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2112 }
2113
2114 /* Check if we allow SCTP_SNDRCVINFO. */
2115 if (sp->subscribe.sctp_data_io_event)
2116 sctp_ulpevent_read_sndrcvinfo(event, msg);
2117#if 0
2118 /* FIXME: we should be calling IP/IPv6 layers. */
2119 if (sk->sk_protinfo.af_inet.cmsg_flags)
2120 ip_cmsg_recv(msg, skb);
2121#endif
2122
2123 err = copied;
2124
2125 /* If skb's length exceeds the user's buffer, update the skb and
2126 * push it back to the receive_queue so that the next call to
2127 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2128 */
2129 if (skb_len > copied) {
2130 msg->msg_flags &= ~MSG_EOR;
2131 if (flags & MSG_PEEK)
2132 goto out_free;
2133 sctp_skb_pull(skb, copied);
2134 skb_queue_head(&sk->sk_receive_queue, skb);
2135
2136 /* When only partial message is copied to the user, increase
2137 * rwnd by that amount. If all the data in the skb is read,
2138 * rwnd is updated when the event is freed.
2139 */
Vlad Yasevich0eca8fe2008-01-11 10:12:56 -05002140 if (!sctp_ulpevent_is_notification(event))
2141 sctp_assoc_rwnd_increase(event->asoc, copied);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002142 goto out;
2143 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2144 (event->msg_flags & MSG_EOR))
2145 msg->msg_flags |= MSG_EOR;
2146 else
2147 msg->msg_flags &= ~MSG_EOR;
2148
2149out_free:
2150 if (flags & MSG_PEEK) {
2151 /* Release the skb reference acquired after peeking the skb in
2152 * sctp_skb_recv_datagram().
2153 */
2154 kfree_skb(skb);
2155 } else {
2156 /* Free the event which includes releasing the reference to
2157 * the owner of the skb, freeing the skb and updating the
2158 * rwnd.
2159 */
2160 sctp_ulpevent_free(event);
2161 }
2162out:
2163 sctp_release_sock(sk);
2164 return err;
2165}
2166
2167/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2168 *
2169 * This option is a on/off flag. If enabled no SCTP message
2170 * fragmentation will be performed. Instead if a message being sent
2171 * exceeds the current PMTU size, the message will NOT be sent and
2172 * instead a error will be indicated to the user.
2173 */
2174static int sctp_setsockopt_disable_fragments(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002175 char __user *optval,
2176 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177{
2178 int val;
2179
2180 if (optlen < sizeof(int))
2181 return -EINVAL;
2182
2183 if (get_user(val, (int __user *)optval))
2184 return -EFAULT;
2185
2186 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2187
2188 return 0;
2189}
2190
2191static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002192 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002193{
Wei Yongjun94912302011-07-02 09:28:04 +00002194 struct sctp_association *asoc;
2195 struct sctp_ulpevent *event;
2196
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05002197 if (optlen > sizeof(struct sctp_event_subscribe))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002198 return -EINVAL;
2199 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2200 return -EFAULT;
Wei Yongjun94912302011-07-02 09:28:04 +00002201
2202 /*
2203 * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2204 * if there is no data to be sent or retransmit, the stack will
2205 * immediately send up this notification.
2206 */
2207 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2208 &sctp_sk(sk)->subscribe)) {
2209 asoc = sctp_id2assoc(sk, 0);
2210
2211 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2212 event = sctp_ulpevent_make_sender_dry_event(asoc,
2213 GFP_ATOMIC);
2214 if (!event)
2215 return -ENOMEM;
2216
2217 sctp_ulpq_tail_event(&asoc->ulpq, event);
2218 }
2219 }
2220
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221 return 0;
2222}
2223
2224/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2225 *
2226 * This socket option is applicable to the UDP-style socket only. When
2227 * set it will cause associations that are idle for more than the
2228 * specified number of seconds to automatically close. An association
2229 * being idle is defined an association that has NOT sent or received
2230 * user data. The special value of '0' indicates that no automatic
2231 * close of any associations should be performed. The option expects an
2232 * integer defining the number of seconds of idle time before an
2233 * association is closed.
2234 */
2235static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002236 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237{
2238 struct sctp_sock *sp = sctp_sk(sk);
2239
2240 /* Applicable to UDP-style socket only */
2241 if (sctp_style(sk, TCP))
2242 return -EOPNOTSUPP;
2243 if (optlen != sizeof(int))
2244 return -EINVAL;
2245 if (copy_from_user(&sp->autoclose, optval, optlen))
2246 return -EFAULT;
2247
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248 return 0;
2249}
2250
2251/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2252 *
2253 * Applications can enable or disable heartbeats for any peer address of
2254 * an association, modify an address's heartbeat interval, force a
2255 * heartbeat to be sent immediately, and adjust the address's maximum
2256 * number of retransmissions sent before an address is considered
2257 * unreachable. The following structure is used to access and modify an
2258 * address's parameters:
2259 *
2260 * struct sctp_paddrparams {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002261 * sctp_assoc_t spp_assoc_id;
2262 * struct sockaddr_storage spp_address;
2263 * uint32_t spp_hbinterval;
2264 * uint16_t spp_pathmaxrxt;
2265 * uint32_t spp_pathmtu;
2266 * uint32_t spp_sackdelay;
2267 * uint32_t spp_flags;
2268 * };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08002270 * spp_assoc_id - (one-to-many style socket) This is filled in the
2271 * application, and identifies the association for
2272 * this query.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002273 * spp_address - This specifies which address is of interest.
2274 * spp_hbinterval - This contains the value of the heartbeat interval,
Frank Filz52ccb8e2005-12-22 11:36:46 -08002275 * in milliseconds. If a value of zero
2276 * is present in this field then no changes are to
2277 * be made to this parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002278 * spp_pathmaxrxt - This contains the maximum number of
2279 * retransmissions before this address shall be
Frank Filz52ccb8e2005-12-22 11:36:46 -08002280 * considered unreachable. If a value of zero
2281 * is present in this field then no changes are to
2282 * be made to this parameter.
2283 * spp_pathmtu - When Path MTU discovery is disabled the value
2284 * specified here will be the "fixed" path mtu.
2285 * Note that if the spp_address field is empty
2286 * then all associations on this address will
2287 * have this fixed path mtu set upon them.
2288 *
2289 * spp_sackdelay - When delayed sack is enabled, this value specifies
2290 * the number of milliseconds that sacks will be delayed
2291 * for. This value will apply to all addresses of an
2292 * association if the spp_address field is empty. Note
2293 * also, that if delayed sack is enabled and this
2294 * value is set to 0, no change is made to the last
2295 * recorded delayed sack timer value.
2296 *
2297 * spp_flags - These flags are used to control various features
2298 * on an association. The flag field may contain
2299 * zero or more of the following options.
2300 *
2301 * SPP_HB_ENABLE - Enable heartbeats on the
2302 * specified address. Note that if the address
2303 * field is empty all addresses for the association
2304 * have heartbeats enabled upon them.
2305 *
2306 * SPP_HB_DISABLE - Disable heartbeats on the
2307 * speicifed address. Note that if the address
2308 * field is empty all addresses for the association
2309 * will have their heartbeats disabled. Note also
2310 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2311 * mutually exclusive, only one of these two should
2312 * be specified. Enabling both fields will have
2313 * undetermined results.
2314 *
2315 * SPP_HB_DEMAND - Request a user initiated heartbeat
2316 * to be made immediately.
2317 *
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002318 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2319 * heartbeat delayis to be set to the value of 0
2320 * milliseconds.
2321 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08002322 * SPP_PMTUD_ENABLE - This field will enable PMTU
2323 * discovery upon the specified address. Note that
2324 * if the address feild is empty then all addresses
2325 * on the association are effected.
2326 *
2327 * SPP_PMTUD_DISABLE - This field will disable PMTU
2328 * discovery upon the specified address. Note that
2329 * if the address feild is empty then all addresses
2330 * on the association are effected. Not also that
2331 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2332 * exclusive. Enabling both will have undetermined
2333 * results.
2334 *
2335 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2336 * on delayed sack. The time specified in spp_sackdelay
2337 * is used to specify the sack delay for this address. Note
2338 * that if spp_address is empty then all addresses will
2339 * enable delayed sack and take on the sack delay
2340 * value specified in spp_sackdelay.
2341 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2342 * off delayed sack. If the spp_address field is blank then
2343 * delayed sack is disabled for the entire association. Note
2344 * also that this field is mutually exclusive to
2345 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2346 * results.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002347 */
Adrian Bunk16164362006-09-18 00:40:38 -07002348static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2349 struct sctp_transport *trans,
2350 struct sctp_association *asoc,
2351 struct sctp_sock *sp,
2352 int hb_change,
2353 int pmtud_change,
2354 int sackdelay_change)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002356 int error;
2357
Frank Filz52ccb8e2005-12-22 11:36:46 -08002358 if (params->spp_flags & SPP_HB_DEMAND && trans) {
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00002359 struct net *net = sock_net(trans->asoc->base.sk);
2360
2361 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002362 if (error)
2363 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002364 }
2365
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002366 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2367 * this field is ignored. Note also that a value of zero indicates
2368 * the current setting should be left unchanged.
2369 */
2370 if (params->spp_flags & SPP_HB_ENABLE) {
2371
2372 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2373 * set. This lets us use 0 value when this flag
2374 * is set.
2375 */
2376 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2377 params->spp_hbinterval = 0;
2378
2379 if (params->spp_hbinterval ||
2380 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2381 if (trans) {
2382 trans->hbinterval =
2383 msecs_to_jiffies(params->spp_hbinterval);
2384 } else if (asoc) {
2385 asoc->hbinterval =
2386 msecs_to_jiffies(params->spp_hbinterval);
2387 } else {
2388 sp->hbinterval = params->spp_hbinterval;
2389 }
Frank Filz52ccb8e2005-12-22 11:36:46 -08002390 }
2391 }
2392
2393 if (hb_change) {
2394 if (trans) {
2395 trans->param_flags =
2396 (trans->param_flags & ~SPP_HB) | hb_change;
2397 } else if (asoc) {
2398 asoc->param_flags =
2399 (asoc->param_flags & ~SPP_HB) | hb_change;
2400 } else {
2401 sp->param_flags =
2402 (sp->param_flags & ~SPP_HB) | hb_change;
2403 }
2404 }
2405
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002406 /* When Path MTU discovery is disabled the value specified here will
2407 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2408 * include the flag SPP_PMTUD_DISABLE for this field to have any
2409 * effect).
2410 */
2411 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002412 if (trans) {
2413 trans->pathmtu = params->spp_pathmtu;
David S. Miller02f3d4c2012-07-16 03:57:14 -07002414 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
Frank Filz52ccb8e2005-12-22 11:36:46 -08002415 } else if (asoc) {
2416 asoc->pathmtu = params->spp_pathmtu;
Vlad Yasevichf68b2e02009-09-04 18:21:00 -04002417 sctp_frag_point(asoc, params->spp_pathmtu);
Frank Filz52ccb8e2005-12-22 11:36:46 -08002418 } else {
2419 sp->pathmtu = params->spp_pathmtu;
2420 }
2421 }
2422
2423 if (pmtud_change) {
2424 if (trans) {
2425 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2426 (params->spp_flags & SPP_PMTUD_ENABLE);
2427 trans->param_flags =
2428 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2429 if (update) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +00002430 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
David S. Miller02f3d4c2012-07-16 03:57:14 -07002431 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
Frank Filz52ccb8e2005-12-22 11:36:46 -08002432 }
2433 } else if (asoc) {
2434 asoc->param_flags =
2435 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2436 } else {
2437 sp->param_flags =
2438 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2439 }
2440 }
2441
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002442 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2443 * value of this field is ignored. Note also that a value of zero
2444 * indicates the current setting should be left unchanged.
2445 */
2446 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002447 if (trans) {
2448 trans->sackdelay =
2449 msecs_to_jiffies(params->spp_sackdelay);
2450 } else if (asoc) {
2451 asoc->sackdelay =
2452 msecs_to_jiffies(params->spp_sackdelay);
2453 } else {
2454 sp->sackdelay = params->spp_sackdelay;
2455 }
2456 }
2457
2458 if (sackdelay_change) {
2459 if (trans) {
2460 trans->param_flags =
2461 (trans->param_flags & ~SPP_SACKDELAY) |
2462 sackdelay_change;
2463 } else if (asoc) {
2464 asoc->param_flags =
2465 (asoc->param_flags & ~SPP_SACKDELAY) |
2466 sackdelay_change;
2467 } else {
2468 sp->param_flags =
2469 (sp->param_flags & ~SPP_SACKDELAY) |
2470 sackdelay_change;
2471 }
2472 }
2473
Andrei Pelinescu-Onciul37051f72009-11-23 15:53:57 -05002474 /* Note that a value of zero indicates the current setting should be
2475 left unchanged.
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002476 */
Andrei Pelinescu-Onciul37051f72009-11-23 15:53:57 -05002477 if (params->spp_pathmaxrxt) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002478 if (trans) {
2479 trans->pathmaxrxt = params->spp_pathmaxrxt;
2480 } else if (asoc) {
2481 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2482 } else {
2483 sp->pathmaxrxt = params->spp_pathmaxrxt;
2484 }
2485 }
2486
2487 return 0;
2488}
2489
2490static int sctp_setsockopt_peer_addr_params(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002491 char __user *optval,
2492 unsigned int optlen)
Frank Filz52ccb8e2005-12-22 11:36:46 -08002493{
2494 struct sctp_paddrparams params;
2495 struct sctp_transport *trans = NULL;
2496 struct sctp_association *asoc = NULL;
2497 struct sctp_sock *sp = sctp_sk(sk);
2498 int error;
2499 int hb_change, pmtud_change, sackdelay_change;
2500
2501 if (optlen != sizeof(struct sctp_paddrparams))
2502 return - EINVAL;
2503
2504 if (copy_from_user(&params, optval, optlen))
2505 return -EFAULT;
2506
2507 /* Validate flags and value parameters. */
2508 hb_change = params.spp_flags & SPP_HB;
2509 pmtud_change = params.spp_flags & SPP_PMTUD;
2510 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2511
2512 if (hb_change == SPP_HB ||
2513 pmtud_change == SPP_PMTUD ||
2514 sackdelay_change == SPP_SACKDELAY ||
2515 params.spp_sackdelay > 500 ||
Joe Perchesf64f9e72009-11-29 16:55:45 -08002516 (params.spp_pathmtu &&
2517 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
Frank Filz52ccb8e2005-12-22 11:36:46 -08002518 return -EINVAL;
2519
2520 /* If an address other than INADDR_ANY is specified, and
2521 * no transport is found, then the request is invalid.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002522 */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -04002523 if (!sctp_is_any(sk, ( union sctp_addr *)&params.spp_address)) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002524 trans = sctp_addr_id2transport(sk, &params.spp_address,
2525 params.spp_assoc_id);
2526 if (!trans)
2527 return -EINVAL;
2528 }
2529
2530 /* Get association, if assoc_id != 0 and the socket is a one
2531 * to many style socket, and an association was not found, then
2532 * the id was invalid.
2533 */
2534 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2535 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2536 return -EINVAL;
2537
2538 /* Heartbeat demand can only be sent on a transport or
2539 * association, but not a socket.
2540 */
2541 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2542 return -EINVAL;
2543
2544 /* Process parameters. */
2545 error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2546 hb_change, pmtud_change,
2547 sackdelay_change);
2548
2549 if (error)
2550 return error;
2551
2552 /* If changes are for association, also apply parameters to each
2553 * transport.
2554 */
2555 if (!trans && asoc) {
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002556 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2557 transports) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002558 sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2559 hb_change, pmtud_change,
2560 sackdelay_change);
2561 }
2562 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563
2564 return 0;
2565}
2566
Wei Yongjund364d922008-05-09 15:13:26 -07002567/*
2568 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
Frank Filz77086102005-12-22 11:37:30 -08002569 *
Wei Yongjund364d922008-05-09 15:13:26 -07002570 * This option will effect the way delayed acks are performed. This
2571 * option allows you to get or set the delayed ack time, in
2572 * milliseconds. It also allows changing the delayed ack frequency.
2573 * Changing the frequency to 1 disables the delayed sack algorithm. If
2574 * the assoc_id is 0, then this sets or gets the endpoints default
2575 * values. If the assoc_id field is non-zero, then the set or get
2576 * effects the specified association for the one to many model (the
2577 * assoc_id field is ignored by the one to one model). Note that if
2578 * sack_delay or sack_freq are 0 when setting this option, then the
2579 * current values will remain unchanged.
Frank Filz77086102005-12-22 11:37:30 -08002580 *
Wei Yongjund364d922008-05-09 15:13:26 -07002581 * struct sctp_sack_info {
2582 * sctp_assoc_t sack_assoc_id;
2583 * uint32_t sack_delay;
2584 * uint32_t sack_freq;
2585 * };
Frank Filz77086102005-12-22 11:37:30 -08002586 *
Wei Yongjund364d922008-05-09 15:13:26 -07002587 * sack_assoc_id - This parameter, indicates which association the user
2588 * is performing an action upon. Note that if this field's value is
2589 * zero then the endpoints default value is changed (effecting future
2590 * associations only).
Frank Filz77086102005-12-22 11:37:30 -08002591 *
Wei Yongjund364d922008-05-09 15:13:26 -07002592 * sack_delay - This parameter contains the number of milliseconds that
2593 * the user is requesting the delayed ACK timer be set to. Note that
2594 * this value is defined in the standard to be between 200 and 500
2595 * milliseconds.
Frank Filz77086102005-12-22 11:37:30 -08002596 *
Wei Yongjund364d922008-05-09 15:13:26 -07002597 * sack_freq - This parameter contains the number of packets that must
2598 * be received before a sack is sent without waiting for the delay
2599 * timer to expire. The default value for this is 2, setting this
2600 * value to 1 will disable the delayed sack algorithm.
Frank Filz77086102005-12-22 11:37:30 -08002601 */
2602
Wei Yongjund364d922008-05-09 15:13:26 -07002603static int sctp_setsockopt_delayed_ack(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002604 char __user *optval, unsigned int optlen)
Frank Filz77086102005-12-22 11:37:30 -08002605{
Wei Yongjund364d922008-05-09 15:13:26 -07002606 struct sctp_sack_info params;
Frank Filz77086102005-12-22 11:37:30 -08002607 struct sctp_transport *trans = NULL;
2608 struct sctp_association *asoc = NULL;
2609 struct sctp_sock *sp = sctp_sk(sk);
2610
Wei Yongjund364d922008-05-09 15:13:26 -07002611 if (optlen == sizeof(struct sctp_sack_info)) {
2612 if (copy_from_user(&params, optval, optlen))
2613 return -EFAULT;
2614
2615 if (params.sack_delay == 0 && params.sack_freq == 0)
2616 return 0;
2617 } else if (optlen == sizeof(struct sctp_assoc_value)) {
Joe Perches145ce502010-08-24 13:21:08 +00002618 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2619 pr_warn("Use struct sctp_sack_info instead\n");
Wei Yongjund364d922008-05-09 15:13:26 -07002620 if (copy_from_user(&params, optval, optlen))
2621 return -EFAULT;
2622
2623 if (params.sack_delay == 0)
2624 params.sack_freq = 1;
2625 else
2626 params.sack_freq = 0;
2627 } else
Frank Filz77086102005-12-22 11:37:30 -08002628 return - EINVAL;
2629
Frank Filz77086102005-12-22 11:37:30 -08002630 /* Validate value parameter. */
Wei Yongjund364d922008-05-09 15:13:26 -07002631 if (params.sack_delay > 500)
Frank Filz77086102005-12-22 11:37:30 -08002632 return -EINVAL;
2633
Wei Yongjund364d922008-05-09 15:13:26 -07002634 /* Get association, if sack_assoc_id != 0 and the socket is a one
Frank Filz77086102005-12-22 11:37:30 -08002635 * to many style socket, and an association was not found, then
2636 * the id was invalid.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002637 */
Wei Yongjund364d922008-05-09 15:13:26 -07002638 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2639 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
Frank Filz77086102005-12-22 11:37:30 -08002640 return -EINVAL;
2641
Wei Yongjund364d922008-05-09 15:13:26 -07002642 if (params.sack_delay) {
Frank Filz77086102005-12-22 11:37:30 -08002643 if (asoc) {
2644 asoc->sackdelay =
Wei Yongjund364d922008-05-09 15:13:26 -07002645 msecs_to_jiffies(params.sack_delay);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002646 asoc->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002647 (asoc->param_flags & ~SPP_SACKDELAY) |
2648 SPP_SACKDELAY_ENABLE;
2649 } else {
Wei Yongjund364d922008-05-09 15:13:26 -07002650 sp->sackdelay = params.sack_delay;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002651 sp->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002652 (sp->param_flags & ~SPP_SACKDELAY) |
2653 SPP_SACKDELAY_ENABLE;
2654 }
Wei Yongjund364d922008-05-09 15:13:26 -07002655 }
2656
2657 if (params.sack_freq == 1) {
Frank Filz77086102005-12-22 11:37:30 -08002658 if (asoc) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002659 asoc->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002660 (asoc->param_flags & ~SPP_SACKDELAY) |
2661 SPP_SACKDELAY_DISABLE;
2662 } else {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002663 sp->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002664 (sp->param_flags & ~SPP_SACKDELAY) |
2665 SPP_SACKDELAY_DISABLE;
2666 }
Wei Yongjund364d922008-05-09 15:13:26 -07002667 } else if (params.sack_freq > 1) {
2668 if (asoc) {
2669 asoc->sackfreq = params.sack_freq;
2670 asoc->param_flags =
2671 (asoc->param_flags & ~SPP_SACKDELAY) |
2672 SPP_SACKDELAY_ENABLE;
2673 } else {
2674 sp->sackfreq = params.sack_freq;
2675 sp->param_flags =
2676 (sp->param_flags & ~SPP_SACKDELAY) |
2677 SPP_SACKDELAY_ENABLE;
2678 }
Frank Filz77086102005-12-22 11:37:30 -08002679 }
2680
2681 /* If change is for association, also apply to each transport. */
2682 if (asoc) {
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002683 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2684 transports) {
Wei Yongjund364d922008-05-09 15:13:26 -07002685 if (params.sack_delay) {
Frank Filz77086102005-12-22 11:37:30 -08002686 trans->sackdelay =
Wei Yongjund364d922008-05-09 15:13:26 -07002687 msecs_to_jiffies(params.sack_delay);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002688 trans->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002689 (trans->param_flags & ~SPP_SACKDELAY) |
2690 SPP_SACKDELAY_ENABLE;
Wei Yongjund364d922008-05-09 15:13:26 -07002691 }
Vlad Yasevich7bfe8bd2008-06-09 15:45:05 -07002692 if (params.sack_freq == 1) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002693 trans->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002694 (trans->param_flags & ~SPP_SACKDELAY) |
2695 SPP_SACKDELAY_DISABLE;
Wei Yongjund364d922008-05-09 15:13:26 -07002696 } else if (params.sack_freq > 1) {
2697 trans->sackfreq = params.sack_freq;
2698 trans->param_flags =
2699 (trans->param_flags & ~SPP_SACKDELAY) |
2700 SPP_SACKDELAY_ENABLE;
Frank Filz77086102005-12-22 11:37:30 -08002701 }
2702 }
2703 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002704
Frank Filz77086102005-12-22 11:37:30 -08002705 return 0;
2706}
2707
Linus Torvalds1da177e2005-04-16 15:20:36 -07002708/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2709 *
2710 * Applications can specify protocol parameters for the default association
2711 * initialization. The option name argument to setsockopt() and getsockopt()
2712 * is SCTP_INITMSG.
2713 *
2714 * Setting initialization parameters is effective only on an unconnected
2715 * socket (for UDP-style sockets only future associations are effected
2716 * by the change). With TCP-style sockets, this option is inherited by
2717 * sockets derived from a listener socket.
2718 */
David S. Millerb7058842009-09-30 16:12:20 -07002719static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002720{
2721 struct sctp_initmsg sinit;
2722 struct sctp_sock *sp = sctp_sk(sk);
2723
2724 if (optlen != sizeof(struct sctp_initmsg))
2725 return -EINVAL;
2726 if (copy_from_user(&sinit, optval, optlen))
2727 return -EFAULT;
2728
2729 if (sinit.sinit_num_ostreams)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002730 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002731 if (sinit.sinit_max_instreams)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002732 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002733 if (sinit.sinit_max_attempts)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002734 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002735 if (sinit.sinit_max_init_timeo)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002736 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002737
2738 return 0;
2739}
2740
2741/*
2742 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2743 *
2744 * Applications that wish to use the sendto() system call may wish to
2745 * specify a default set of parameters that would normally be supplied
2746 * through the inclusion of ancillary data. This socket option allows
2747 * such an application to set the default sctp_sndrcvinfo structure.
2748 * The application that wishes to use this socket option simply passes
2749 * in to this call the sctp_sndrcvinfo structure defined in Section
2750 * 5.2.2) The input parameters accepted by this call include
2751 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2752 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2753 * to this call if the caller is using the UDP model.
2754 */
2755static int sctp_setsockopt_default_send_param(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002756 char __user *optval,
2757 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002758{
2759 struct sctp_sndrcvinfo info;
2760 struct sctp_association *asoc;
2761 struct sctp_sock *sp = sctp_sk(sk);
2762
2763 if (optlen != sizeof(struct sctp_sndrcvinfo))
2764 return -EINVAL;
2765 if (copy_from_user(&info, optval, optlen))
2766 return -EFAULT;
2767
2768 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2769 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2770 return -EINVAL;
2771
2772 if (asoc) {
2773 asoc->default_stream = info.sinfo_stream;
2774 asoc->default_flags = info.sinfo_flags;
2775 asoc->default_ppid = info.sinfo_ppid;
2776 asoc->default_context = info.sinfo_context;
2777 asoc->default_timetolive = info.sinfo_timetolive;
2778 } else {
2779 sp->default_stream = info.sinfo_stream;
2780 sp->default_flags = info.sinfo_flags;
2781 sp->default_ppid = info.sinfo_ppid;
2782 sp->default_context = info.sinfo_context;
2783 sp->default_timetolive = info.sinfo_timetolive;
2784 }
2785
2786 return 0;
2787}
2788
2789/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2790 *
2791 * Requests that the local SCTP stack use the enclosed peer address as
2792 * the association primary. The enclosed address must be one of the
2793 * association peer's addresses.
2794 */
2795static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002796 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002797{
2798 struct sctp_prim prim;
2799 struct sctp_transport *trans;
2800
2801 if (optlen != sizeof(struct sctp_prim))
2802 return -EINVAL;
2803
2804 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2805 return -EFAULT;
2806
2807 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2808 if (!trans)
2809 return -EINVAL;
2810
2811 sctp_assoc_set_primary(trans->asoc, trans);
2812
2813 return 0;
2814}
2815
2816/*
2817 * 7.1.5 SCTP_NODELAY
2818 *
2819 * Turn on/off any Nagle-like algorithm. This means that packets are
2820 * generally sent as soon as possible and no unnecessary delays are
2821 * introduced, at the cost of more packets in the network. Expects an
2822 * integer boolean flag.
2823 */
2824static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002825 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002826{
2827 int val;
2828
2829 if (optlen < sizeof(int))
2830 return -EINVAL;
2831 if (get_user(val, (int __user *)optval))
2832 return -EFAULT;
2833
2834 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2835 return 0;
2836}
2837
2838/*
2839 *
2840 * 7.1.1 SCTP_RTOINFO
2841 *
2842 * The protocol parameters used to initialize and bound retransmission
2843 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2844 * and modify these parameters.
2845 * All parameters are time values, in milliseconds. A value of 0, when
2846 * modifying the parameters, indicates that the current value should not
2847 * be changed.
2848 *
2849 */
David S. Millerb7058842009-09-30 16:12:20 -07002850static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2851{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002852 struct sctp_rtoinfo rtoinfo;
2853 struct sctp_association *asoc;
2854
2855 if (optlen != sizeof (struct sctp_rtoinfo))
2856 return -EINVAL;
2857
2858 if (copy_from_user(&rtoinfo, optval, optlen))
2859 return -EFAULT;
2860
2861 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2862
2863 /* Set the values to the specific association */
2864 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2865 return -EINVAL;
2866
2867 if (asoc) {
2868 if (rtoinfo.srto_initial != 0)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002869 asoc->rto_initial =
Linus Torvalds1da177e2005-04-16 15:20:36 -07002870 msecs_to_jiffies(rtoinfo.srto_initial);
2871 if (rtoinfo.srto_max != 0)
2872 asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2873 if (rtoinfo.srto_min != 0)
2874 asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2875 } else {
2876 /* If there is no association or the association-id = 0
2877 * set the values to the endpoint.
2878 */
2879 struct sctp_sock *sp = sctp_sk(sk);
2880
2881 if (rtoinfo.srto_initial != 0)
2882 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2883 if (rtoinfo.srto_max != 0)
2884 sp->rtoinfo.srto_max = rtoinfo.srto_max;
2885 if (rtoinfo.srto_min != 0)
2886 sp->rtoinfo.srto_min = rtoinfo.srto_min;
2887 }
2888
2889 return 0;
2890}
2891
2892/*
2893 *
2894 * 7.1.2 SCTP_ASSOCINFO
2895 *
Michael Opdenacker59c51592007-05-09 08:57:56 +02002896 * This option is used to tune the maximum retransmission attempts
Linus Torvalds1da177e2005-04-16 15:20:36 -07002897 * of the association.
2898 * Returns an error if the new association retransmission value is
2899 * greater than the sum of the retransmission value of the peer.
2900 * See [SCTP] for more information.
2901 *
2902 */
David S. Millerb7058842009-09-30 16:12:20 -07002903static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002904{
2905
2906 struct sctp_assocparams assocparams;
2907 struct sctp_association *asoc;
2908
2909 if (optlen != sizeof(struct sctp_assocparams))
2910 return -EINVAL;
2911 if (copy_from_user(&assocparams, optval, optlen))
2912 return -EFAULT;
2913
2914 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2915
2916 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2917 return -EINVAL;
2918
2919 /* Set the values to the specific association */
2920 if (asoc) {
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002921 if (assocparams.sasoc_asocmaxrxt != 0) {
2922 __u32 path_sum = 0;
2923 int paths = 0;
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002924 struct sctp_transport *peer_addr;
2925
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002926 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2927 transports) {
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002928 path_sum += peer_addr->pathmaxrxt;
2929 paths++;
2930 }
2931
Frederik Schwarzer025dfda2008-10-16 19:02:37 +02002932 /* Only validate asocmaxrxt if we have more than
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002933 * one path/transport. We do this because path
2934 * retransmissions are only counted when we have more
2935 * then one path.
2936 */
2937 if (paths > 1 &&
2938 assocparams.sasoc_asocmaxrxt > path_sum)
2939 return -EINVAL;
2940
Linus Torvalds1da177e2005-04-16 15:20:36 -07002941 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002942 }
2943
Linus Torvalds1da177e2005-04-16 15:20:36 -07002944 if (assocparams.sasoc_cookie_life != 0) {
2945 asoc->cookie_life.tv_sec =
2946 assocparams.sasoc_cookie_life / 1000;
2947 asoc->cookie_life.tv_usec =
2948 (assocparams.sasoc_cookie_life % 1000)
2949 * 1000;
2950 }
2951 } else {
2952 /* Set the values to the endpoint */
2953 struct sctp_sock *sp = sctp_sk(sk);
2954
2955 if (assocparams.sasoc_asocmaxrxt != 0)
2956 sp->assocparams.sasoc_asocmaxrxt =
2957 assocparams.sasoc_asocmaxrxt;
2958 if (assocparams.sasoc_cookie_life != 0)
2959 sp->assocparams.sasoc_cookie_life =
2960 assocparams.sasoc_cookie_life;
2961 }
2962 return 0;
2963}
2964
2965/*
2966 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2967 *
2968 * This socket option is a boolean flag which turns on or off mapped V4
2969 * addresses. If this option is turned on and the socket is type
2970 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2971 * If this option is turned off, then no mapping will be done of V4
2972 * addresses and a user will receive both PF_INET6 and PF_INET type
2973 * addresses on the socket.
2974 */
David S. Millerb7058842009-09-30 16:12:20 -07002975static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002976{
2977 int val;
2978 struct sctp_sock *sp = sctp_sk(sk);
2979
2980 if (optlen < sizeof(int))
2981 return -EINVAL;
2982 if (get_user(val, (int __user *)optval))
2983 return -EFAULT;
2984 if (val)
2985 sp->v4mapped = 1;
2986 else
2987 sp->v4mapped = 0;
2988
2989 return 0;
2990}
2991
2992/*
Wei Yongjune89c2092008-12-25 16:54:58 -08002993 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2994 * This option will get or set the maximum size to put in any outgoing
2995 * SCTP DATA chunk. If a message is larger than this size it will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07002996 * fragmented by SCTP into the specified size. Note that the underlying
2997 * SCTP implementation may fragment into smaller sized chunks when the
2998 * PMTU of the underlying association is smaller than the value set by
Wei Yongjune89c2092008-12-25 16:54:58 -08002999 * the user. The default value for this option is '0' which indicates
3000 * the user is NOT limiting fragmentation and only the PMTU will effect
3001 * SCTP's choice of DATA chunk size. Note also that values set larger
3002 * than the maximum size of an IP datagram will effectively let SCTP
3003 * control fragmentation (i.e. the same as setting this option to 0).
3004 *
3005 * The following structure is used to access and modify this parameter:
3006 *
3007 * struct sctp_assoc_value {
3008 * sctp_assoc_t assoc_id;
3009 * uint32_t assoc_value;
3010 * };
3011 *
3012 * assoc_id: This parameter is ignored for one-to-one style sockets.
3013 * For one-to-many style sockets this parameter indicates which
3014 * association the user is performing an action upon. Note that if
3015 * this field's value is zero then the endpoints default value is
3016 * changed (effecting future associations only).
3017 * assoc_value: This parameter specifies the maximum size in bytes.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018 */
David S. Millerb7058842009-09-30 16:12:20 -07003019static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003020{
Wei Yongjune89c2092008-12-25 16:54:58 -08003021 struct sctp_assoc_value params;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003022 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003023 struct sctp_sock *sp = sctp_sk(sk);
3024 int val;
3025
Wei Yongjune89c2092008-12-25 16:54:58 -08003026 if (optlen == sizeof(int)) {
Joe Perches145ce502010-08-24 13:21:08 +00003027 pr_warn("Use of int in maxseg socket option deprecated\n");
3028 pr_warn("Use struct sctp_assoc_value instead\n");
Wei Yongjune89c2092008-12-25 16:54:58 -08003029 if (copy_from_user(&val, optval, optlen))
3030 return -EFAULT;
3031 params.assoc_id = 0;
3032 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3033 if (copy_from_user(&params, optval, optlen))
3034 return -EFAULT;
3035 val = params.assoc_value;
3036 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07003037 return -EINVAL;
Wei Yongjune89c2092008-12-25 16:54:58 -08003038
Ivan Skytte Jorgensen96a33992005-10-28 15:36:12 -07003039 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003040 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003041
Wei Yongjune89c2092008-12-25 16:54:58 -08003042 asoc = sctp_id2assoc(sk, params.assoc_id);
3043 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3044 return -EINVAL;
3045
3046 if (asoc) {
3047 if (val == 0) {
3048 val = asoc->pathmtu;
3049 val -= sp->pf->af->net_header_len;
3050 val -= sizeof(struct sctphdr) +
3051 sizeof(struct sctp_data_chunk);
3052 }
Vlad Yasevichf68b2e02009-09-04 18:21:00 -04003053 asoc->user_frag = val;
3054 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
Wei Yongjune89c2092008-12-25 16:54:58 -08003055 } else {
3056 sp->user_frag = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003057 }
3058
3059 return 0;
3060}
3061
3062
3063/*
3064 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3065 *
3066 * Requests that the peer mark the enclosed address as the association
3067 * primary. The enclosed address must be one of the association's
3068 * locally bound addresses. The following structure is used to make a
3069 * set primary request:
3070 */
3071static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003072 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003073{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003074 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003075 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003076 struct sctp_association *asoc = NULL;
3077 struct sctp_setpeerprim prim;
3078 struct sctp_chunk *chunk;
Wei Yongjun40a01032010-12-07 17:11:09 +00003079 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003080 int err;
3081
3082 sp = sctp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003083
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003084 if (!net->sctp.addip_enable)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085 return -EPERM;
3086
3087 if (optlen != sizeof(struct sctp_setpeerprim))
3088 return -EINVAL;
3089
3090 if (copy_from_user(&prim, optval, optlen))
3091 return -EFAULT;
3092
3093 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003094 if (!asoc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003095 return -EINVAL;
3096
3097 if (!asoc->peer.asconf_capable)
3098 return -EPERM;
3099
3100 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3101 return -EPERM;
3102
3103 if (!sctp_state(asoc, ESTABLISHED))
3104 return -ENOTCONN;
3105
Wei Yongjun40a01032010-12-07 17:11:09 +00003106 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3107 if (!af)
3108 return -EINVAL;
3109
3110 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3111 return -EADDRNOTAVAIL;
3112
Linus Torvalds1da177e2005-04-16 15:20:36 -07003113 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3114 return -EADDRNOTAVAIL;
3115
3116 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3117 chunk = sctp_make_asconf_set_prim(asoc,
3118 (union sctp_addr *)&prim.sspp_addr);
3119 if (!chunk)
3120 return -ENOMEM;
3121
3122 err = sctp_send_asconf(asoc, chunk);
3123
3124 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
3125
3126 return err;
3127}
3128
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003129static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003130 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003131{
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003132 struct sctp_setadaptation adaptation;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003133
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003134 if (optlen != sizeof(struct sctp_setadaptation))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003135 return -EINVAL;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003136 if (copy_from_user(&adaptation, optval, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003137 return -EFAULT;
3138
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003139 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003140
3141 return 0;
3142}
3143
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003144/*
3145 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3146 *
3147 * The context field in the sctp_sndrcvinfo structure is normally only
3148 * used when a failed message is retrieved holding the value that was
3149 * sent down on the actual send call. This option allows the setting of
3150 * a default context on an association basis that will be received on
3151 * reading messages from the peer. This is especially helpful in the
3152 * one-2-many model for an application to keep some reference to an
3153 * internal state machine that is processing messages on the
3154 * association. Note that the setting of this value only effects
3155 * received messages from the peer and does not effect the value that is
3156 * saved with outbound messages.
3157 */
3158static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003159 unsigned int optlen)
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003160{
3161 struct sctp_assoc_value params;
3162 struct sctp_sock *sp;
3163 struct sctp_association *asoc;
3164
3165 if (optlen != sizeof(struct sctp_assoc_value))
3166 return -EINVAL;
3167 if (copy_from_user(&params, optval, optlen))
3168 return -EFAULT;
3169
3170 sp = sctp_sk(sk);
3171
3172 if (params.assoc_id != 0) {
3173 asoc = sctp_id2assoc(sk, params.assoc_id);
3174 if (!asoc)
3175 return -EINVAL;
3176 asoc->default_rcv_context = params.assoc_value;
3177 } else {
3178 sp->default_rcv_context = params.assoc_value;
3179 }
3180
3181 return 0;
3182}
3183
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003184/*
3185 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3186 *
3187 * This options will at a minimum specify if the implementation is doing
3188 * fragmented interleave. Fragmented interleave, for a one to many
3189 * socket, is when subsequent calls to receive a message may return
3190 * parts of messages from different associations. Some implementations
3191 * may allow you to turn this value on or off. If so, when turned off,
3192 * no fragment interleave will occur (which will cause a head of line
3193 * blocking amongst multiple associations sharing the same one to many
3194 * socket). When this option is turned on, then each receive call may
3195 * come from a different association (thus the user must receive data
3196 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3197 * association each receive belongs to.
3198 *
3199 * This option takes a boolean value. A non-zero value indicates that
3200 * fragmented interleave is on. A value of zero indicates that
3201 * fragmented interleave is off.
3202 *
3203 * Note that it is important that an implementation that allows this
3204 * option to be turned on, have it off by default. Otherwise an unaware
3205 * application using the one to many model may become confused and act
3206 * incorrectly.
3207 */
3208static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3209 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003210 unsigned int optlen)
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003211{
3212 int val;
3213
3214 if (optlen != sizeof(int))
3215 return -EINVAL;
3216 if (get_user(val, (int __user *)optval))
3217 return -EFAULT;
3218
3219 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3220
3221 return 0;
3222}
3223
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003224/*
Wei Yongjun8510b932008-12-25 16:59:03 -08003225 * 8.1.21. Set or Get the SCTP Partial Delivery Point
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003226 * (SCTP_PARTIAL_DELIVERY_POINT)
Wei Yongjun8510b932008-12-25 16:59:03 -08003227 *
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003228 * This option will set or get the SCTP partial delivery point. This
3229 * point is the size of a message where the partial delivery API will be
3230 * invoked to help free up rwnd space for the peer. Setting this to a
Wei Yongjun8510b932008-12-25 16:59:03 -08003231 * lower value will cause partial deliveries to happen more often. The
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003232 * calls argument is an integer that sets or gets the partial delivery
Wei Yongjun8510b932008-12-25 16:59:03 -08003233 * point. Note also that the call will fail if the user attempts to set
3234 * this value larger than the socket receive buffer size.
3235 *
3236 * Note that any single message having a length smaller than or equal to
3237 * the SCTP partial delivery point will be delivered in one single read
3238 * call as long as the user provided buffer is large enough to hold the
3239 * message.
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003240 */
3241static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3242 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003243 unsigned int optlen)
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003244{
3245 u32 val;
3246
3247 if (optlen != sizeof(u32))
3248 return -EINVAL;
3249 if (get_user(val, (int __user *)optval))
3250 return -EFAULT;
3251
Wei Yongjun8510b932008-12-25 16:59:03 -08003252 /* Note: We double the receive buffer from what the user sets
3253 * it to be, also initial rwnd is based on rcvbuf/2.
3254 */
3255 if (val > (sk->sk_rcvbuf >> 1))
3256 return -EINVAL;
3257
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003258 sctp_sk(sk)->pd_point = val;
3259
3260 return 0; /* is this the right error code? */
3261}
3262
Vlad Yasevich70331572007-03-23 11:34:36 -07003263/*
3264 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3265 *
3266 * This option will allow a user to change the maximum burst of packets
3267 * that can be emitted by this association. Note that the default value
3268 * is 4, and some implementations may restrict this setting so that it
3269 * can only be lowered.
3270 *
3271 * NOTE: This text doesn't seem right. Do this on a socket basis with
3272 * future associations inheriting the socket value.
3273 */
3274static int sctp_setsockopt_maxburst(struct sock *sk,
3275 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003276 unsigned int optlen)
Vlad Yasevich70331572007-03-23 11:34:36 -07003277{
Neil Horman219b99a2008-03-05 13:44:46 -08003278 struct sctp_assoc_value params;
3279 struct sctp_sock *sp;
3280 struct sctp_association *asoc;
Vlad Yasevich70331572007-03-23 11:34:36 -07003281 int val;
Neil Horman219b99a2008-03-05 13:44:46 -08003282 int assoc_id = 0;
Vlad Yasevich70331572007-03-23 11:34:36 -07003283
Neil Horman219b99a2008-03-05 13:44:46 -08003284 if (optlen == sizeof(int)) {
Joe Perches145ce502010-08-24 13:21:08 +00003285 pr_warn("Use of int in max_burst socket option deprecated\n");
3286 pr_warn("Use struct sctp_assoc_value instead\n");
Neil Horman219b99a2008-03-05 13:44:46 -08003287 if (copy_from_user(&val, optval, optlen))
3288 return -EFAULT;
3289 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3290 if (copy_from_user(&params, optval, optlen))
3291 return -EFAULT;
3292 val = params.assoc_value;
3293 assoc_id = params.assoc_id;
3294 } else
3295 return -EINVAL;
3296
3297 sp = sctp_sk(sk);
3298
3299 if (assoc_id != 0) {
3300 asoc = sctp_id2assoc(sk, assoc_id);
3301 if (!asoc)
3302 return -EINVAL;
3303 asoc->max_burst = val;
3304 } else
3305 sp->max_burst = val;
Vlad Yasevich70331572007-03-23 11:34:36 -07003306
3307 return 0;
3308}
3309
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003310/*
3311 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3312 *
3313 * This set option adds a chunk type that the user is requesting to be
3314 * received only in an authenticated way. Changes to the list of chunks
3315 * will only effect future associations on the socket.
3316 */
3317static int sctp_setsockopt_auth_chunk(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003318 char __user *optval,
3319 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003320{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003321 struct net *net = sock_net(sk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003322 struct sctp_authchunk val;
3323
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003324 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003325 return -EACCES;
3326
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003327 if (optlen != sizeof(struct sctp_authchunk))
3328 return -EINVAL;
3329 if (copy_from_user(&val, optval, optlen))
3330 return -EFAULT;
3331
3332 switch (val.sauth_chunk) {
Joe Perches7fd71b12011-07-01 09:43:11 +00003333 case SCTP_CID_INIT:
3334 case SCTP_CID_INIT_ACK:
3335 case SCTP_CID_SHUTDOWN_COMPLETE:
3336 case SCTP_CID_AUTH:
3337 return -EINVAL;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003338 }
3339
3340 /* add this chunk id to the endpoint */
3341 return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk);
3342}
3343
3344/*
3345 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3346 *
3347 * This option gets or sets the list of HMAC algorithms that the local
3348 * endpoint requires the peer to use.
3349 */
3350static int sctp_setsockopt_hmac_ident(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003351 char __user *optval,
3352 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003353{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003354 struct net *net = sock_net(sk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003355 struct sctp_hmacalgo *hmacs;
Vlad Yasevichd9724052008-08-27 16:09:49 -07003356 u32 idents;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003357 int err;
3358
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003359 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003360 return -EACCES;
3361
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003362 if (optlen < sizeof(struct sctp_hmacalgo))
3363 return -EINVAL;
3364
Shan Wei934253a2011-04-18 19:13:18 +00003365 hmacs= memdup_user(optval, optlen);
3366 if (IS_ERR(hmacs))
3367 return PTR_ERR(hmacs);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003368
Vlad Yasevichd9724052008-08-27 16:09:49 -07003369 idents = hmacs->shmac_num_idents;
3370 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3371 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003372 err = -EINVAL;
3373 goto out;
3374 }
3375
3376 err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs);
3377out:
3378 kfree(hmacs);
3379 return err;
3380}
3381
3382/*
3383 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3384 *
3385 * This option will set a shared secret key which is used to build an
3386 * association shared key.
3387 */
3388static int sctp_setsockopt_auth_key(struct sock *sk,
3389 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003390 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003391{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003392 struct net *net = sock_net(sk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003393 struct sctp_authkey *authkey;
3394 struct sctp_association *asoc;
3395 int ret;
3396
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003397 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003398 return -EACCES;
3399
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003400 if (optlen <= sizeof(struct sctp_authkey))
3401 return -EINVAL;
3402
Shan Wei934253a2011-04-18 19:13:18 +00003403 authkey= memdup_user(optval, optlen);
3404 if (IS_ERR(authkey))
3405 return PTR_ERR(authkey);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003406
Vlad Yasevich328fc472008-08-27 16:08:54 -07003407 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
Vlad Yasevich30c22352008-08-25 15:16:19 -07003408 ret = -EINVAL;
3409 goto out;
3410 }
3411
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003412 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3413 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3414 ret = -EINVAL;
3415 goto out;
3416 }
3417
3418 ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
3419out:
Daniel Borkmann6ba542a2013-02-08 03:04:34 +00003420 kzfree(authkey);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003421 return ret;
3422}
3423
3424/*
3425 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3426 *
3427 * This option will get or set the active shared key to be used to build
3428 * the association shared key.
3429 */
3430static int sctp_setsockopt_active_key(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003431 char __user *optval,
3432 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003433{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003434 struct net *net = sock_net(sk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003435 struct sctp_authkeyid val;
3436 struct sctp_association *asoc;
3437
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003438 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003439 return -EACCES;
3440
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003441 if (optlen != sizeof(struct sctp_authkeyid))
3442 return -EINVAL;
3443 if (copy_from_user(&val, optval, optlen))
3444 return -EFAULT;
3445
3446 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3447 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3448 return -EINVAL;
3449
3450 return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc,
3451 val.scact_keynumber);
3452}
3453
3454/*
3455 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3456 *
3457 * This set option will delete a shared secret key from use.
3458 */
3459static int sctp_setsockopt_del_key(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003460 char __user *optval,
3461 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003462{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003463 struct net *net = sock_net(sk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003464 struct sctp_authkeyid val;
3465 struct sctp_association *asoc;
3466
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003467 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003468 return -EACCES;
3469
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003470 if (optlen != sizeof(struct sctp_authkeyid))
3471 return -EINVAL;
3472 if (copy_from_user(&val, optval, optlen))
3473 return -EFAULT;
3474
3475 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3476 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3477 return -EINVAL;
3478
3479 return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc,
3480 val.scact_keynumber);
3481
3482}
3483
Michio Honda7dc04d72011-04-26 20:16:31 +09003484/*
3485 * 8.1.23 SCTP_AUTO_ASCONF
3486 *
3487 * This option will enable or disable the use of the automatic generation of
3488 * ASCONF chunks to add and delete addresses to an existing association. Note
3489 * that this option has two caveats namely: a) it only affects sockets that
3490 * are bound to all addresses available to the SCTP stack, and b) the system
3491 * administrator may have an overriding control that turns the ASCONF feature
3492 * off no matter what setting the socket option may have.
3493 * This option expects an integer boolean flag, where a non-zero value turns on
3494 * the option, and a zero value turns off the option.
3495 * Note. In this implementation, socket operation overrides default parameter
3496 * being set by sysctl as well as FreeBSD implementation
3497 */
3498static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3499 unsigned int optlen)
3500{
3501 int val;
3502 struct sctp_sock *sp = sctp_sk(sk);
3503
3504 if (optlen < sizeof(int))
3505 return -EINVAL;
3506 if (get_user(val, (int __user *)optval))
3507 return -EFAULT;
3508 if (!sctp_is_ep_boundall(sk) && val)
3509 return -EINVAL;
3510 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3511 return 0;
3512
3513 if (val == 0 && sp->do_auto_asconf) {
3514 list_del(&sp->auto_asconf_list);
3515 sp->do_auto_asconf = 0;
3516 } else if (val && !sp->do_auto_asconf) {
3517 list_add_tail(&sp->auto_asconf_list,
Eric W. Biederman4db67e82012-08-06 08:42:04 +00003518 &sock_net(sk)->sctp.auto_asconf_splist);
Michio Honda7dc04d72011-04-26 20:16:31 +09003519 sp->do_auto_asconf = 1;
3520 }
3521 return 0;
3522}
3523
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003524
Neil Horman5aa93bc2012-07-21 07:56:07 +00003525/*
3526 * SCTP_PEER_ADDR_THLDS
3527 *
3528 * This option allows us to alter the partially failed threshold for one or all
3529 * transports in an association. See Section 6.1 of:
3530 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3531 */
3532static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3533 char __user *optval,
3534 unsigned int optlen)
3535{
3536 struct sctp_paddrthlds val;
3537 struct sctp_transport *trans;
3538 struct sctp_association *asoc;
3539
3540 if (optlen < sizeof(struct sctp_paddrthlds))
3541 return -EINVAL;
3542 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3543 sizeof(struct sctp_paddrthlds)))
3544 return -EFAULT;
3545
3546
3547 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3548 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3549 if (!asoc)
3550 return -ENOENT;
3551 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3552 transports) {
3553 if (val.spt_pathmaxrxt)
3554 trans->pathmaxrxt = val.spt_pathmaxrxt;
3555 trans->pf_retrans = val.spt_pathpfthld;
3556 }
3557
3558 if (val.spt_pathmaxrxt)
3559 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3560 asoc->pf_retrans = val.spt_pathpfthld;
3561 } else {
3562 trans = sctp_addr_id2transport(sk, &val.spt_address,
3563 val.spt_assoc_id);
3564 if (!trans)
3565 return -ENOENT;
3566
3567 if (val.spt_pathmaxrxt)
3568 trans->pathmaxrxt = val.spt_pathmaxrxt;
3569 trans->pf_retrans = val.spt_pathpfthld;
3570 }
3571
3572 return 0;
3573}
3574
Linus Torvalds1da177e2005-04-16 15:20:36 -07003575/* API 6.2 setsockopt(), getsockopt()
3576 *
3577 * Applications use setsockopt() and getsockopt() to set or retrieve
3578 * socket options. Socket options are used to change the default
3579 * behavior of sockets calls. They are described in Section 7.
3580 *
3581 * The syntax is:
3582 *
3583 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3584 * int __user *optlen);
3585 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3586 * int optlen);
3587 *
3588 * sd - the socket descript.
3589 * level - set to IPPROTO_SCTP for all SCTP options.
3590 * optname - the option name.
3591 * optval - the buffer to store the value of the option.
3592 * optlen - the size of the buffer.
3593 */
3594SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003595 char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003596{
3597 int retval = 0;
3598
3599 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3600 sk, optname);
3601
3602 /* I can hardly begin to describe how wrong this is. This is
3603 * so broken as to be worse than useless. The API draft
3604 * REALLY is NOT helpful here... I am not convinced that the
3605 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3606 * are at all well-founded.
3607 */
3608 if (level != SOL_SCTP) {
3609 struct sctp_af *af = sctp_sk(sk)->pf->af;
3610 retval = af->setsockopt(sk, level, optname, optval, optlen);
3611 goto out_nounlock;
3612 }
3613
3614 sctp_lock_sock(sk);
3615
3616 switch (optname) {
3617 case SCTP_SOCKOPT_BINDX_ADD:
3618 /* 'optlen' is the size of the addresses buffer. */
3619 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3620 optlen, SCTP_BINDX_ADD_ADDR);
3621 break;
3622
3623 case SCTP_SOCKOPT_BINDX_REM:
3624 /* 'optlen' is the size of the addresses buffer. */
3625 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3626 optlen, SCTP_BINDX_REM_ADDR);
3627 break;
3628
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003629 case SCTP_SOCKOPT_CONNECTX_OLD:
3630 /* 'optlen' is the size of the addresses buffer. */
3631 retval = sctp_setsockopt_connectx_old(sk,
3632 (struct sockaddr __user *)optval,
3633 optlen);
3634 break;
3635
Frank Filz3f7a87d2005-06-20 13:14:57 -07003636 case SCTP_SOCKOPT_CONNECTX:
3637 /* 'optlen' is the size of the addresses buffer. */
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003638 retval = sctp_setsockopt_connectx(sk,
3639 (struct sockaddr __user *)optval,
3640 optlen);
Frank Filz3f7a87d2005-06-20 13:14:57 -07003641 break;
3642
Linus Torvalds1da177e2005-04-16 15:20:36 -07003643 case SCTP_DISABLE_FRAGMENTS:
3644 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3645 break;
3646
3647 case SCTP_EVENTS:
3648 retval = sctp_setsockopt_events(sk, optval, optlen);
3649 break;
3650
3651 case SCTP_AUTOCLOSE:
3652 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3653 break;
3654
3655 case SCTP_PEER_ADDR_PARAMS:
3656 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3657 break;
3658
Shan Wei4580ccc2011-01-18 22:39:00 +00003659 case SCTP_DELAYED_SACK:
Wei Yongjund364d922008-05-09 15:13:26 -07003660 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
Frank Filz77086102005-12-22 11:37:30 -08003661 break;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003662 case SCTP_PARTIAL_DELIVERY_POINT:
3663 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3664 break;
Frank Filz77086102005-12-22 11:37:30 -08003665
Linus Torvalds1da177e2005-04-16 15:20:36 -07003666 case SCTP_INITMSG:
3667 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3668 break;
3669 case SCTP_DEFAULT_SEND_PARAM:
3670 retval = sctp_setsockopt_default_send_param(sk, optval,
3671 optlen);
3672 break;
3673 case SCTP_PRIMARY_ADDR:
3674 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3675 break;
3676 case SCTP_SET_PEER_PRIMARY_ADDR:
3677 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3678 break;
3679 case SCTP_NODELAY:
3680 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3681 break;
3682 case SCTP_RTOINFO:
3683 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3684 break;
3685 case SCTP_ASSOCINFO:
3686 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3687 break;
3688 case SCTP_I_WANT_MAPPED_V4_ADDR:
3689 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3690 break;
3691 case SCTP_MAXSEG:
3692 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3693 break;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003694 case SCTP_ADAPTATION_LAYER:
3695 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003696 break;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003697 case SCTP_CONTEXT:
3698 retval = sctp_setsockopt_context(sk, optval, optlen);
3699 break;
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003700 case SCTP_FRAGMENT_INTERLEAVE:
3701 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3702 break;
Vlad Yasevich70331572007-03-23 11:34:36 -07003703 case SCTP_MAX_BURST:
3704 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3705 break;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003706 case SCTP_AUTH_CHUNK:
3707 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3708 break;
3709 case SCTP_HMAC_IDENT:
3710 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3711 break;
3712 case SCTP_AUTH_KEY:
3713 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3714 break;
3715 case SCTP_AUTH_ACTIVE_KEY:
3716 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3717 break;
3718 case SCTP_AUTH_DELETE_KEY:
3719 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3720 break;
Michio Honda7dc04d72011-04-26 20:16:31 +09003721 case SCTP_AUTO_ASCONF:
3722 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3723 break;
Neil Horman5aa93bc2012-07-21 07:56:07 +00003724 case SCTP_PEER_ADDR_THLDS:
3725 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3726 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003727 default:
3728 retval = -ENOPROTOOPT;
3729 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07003730 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003731
3732 sctp_release_sock(sk);
3733
3734out_nounlock:
3735 return retval;
3736}
3737
3738/* API 3.1.6 connect() - UDP Style Syntax
3739 *
3740 * An application may use the connect() call in the UDP model to initiate an
3741 * association without sending data.
3742 *
3743 * The syntax is:
3744 *
3745 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3746 *
3747 * sd: the socket descriptor to have a new association added to.
3748 *
3749 * nam: the address structure (either struct sockaddr_in or struct
3750 * sockaddr_in6 defined in RFC2553 [7]).
3751 *
3752 * len: the size of the address.
3753 */
Frank Filz3f7a87d2005-06-20 13:14:57 -07003754SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003755 int addr_len)
3756{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003757 int err = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07003758 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003759
3760 sctp_lock_sock(sk);
3761
Frank Filz3f7a87d2005-06-20 13:14:57 -07003762 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -08003763 __func__, sk, addr, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003764
Frank Filz3f7a87d2005-06-20 13:14:57 -07003765 /* Validate addr_len before calling common connect/connectx routine. */
3766 af = sctp_get_af_specific(addr->sa_family);
3767 if (!af || addr_len < af->sockaddr_len) {
3768 err = -EINVAL;
3769 } else {
3770 /* Pass correct addr len to common routine (so it knows there
3771 * is only one address being passed.
3772 */
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003773 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003774 }
3775
Linus Torvalds1da177e2005-04-16 15:20:36 -07003776 sctp_release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003777 return err;
3778}
3779
3780/* FIXME: Write comments. */
3781SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
3782{
3783 return -EOPNOTSUPP; /* STUB */
3784}
3785
3786/* 4.1.4 accept() - TCP Style Syntax
3787 *
3788 * Applications use accept() call to remove an established SCTP
3789 * association from the accept queue of the endpoint. A new socket
3790 * descriptor will be returned from accept() to represent the newly
3791 * formed association.
3792 */
3793SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3794{
3795 struct sctp_sock *sp;
3796 struct sctp_endpoint *ep;
3797 struct sock *newsk = NULL;
3798 struct sctp_association *asoc;
3799 long timeo;
3800 int error = 0;
3801
3802 sctp_lock_sock(sk);
3803
3804 sp = sctp_sk(sk);
3805 ep = sp->ep;
3806
3807 if (!sctp_style(sk, TCP)) {
3808 error = -EOPNOTSUPP;
3809 goto out;
3810 }
3811
3812 if (!sctp_sstate(sk, LISTENING)) {
3813 error = -EINVAL;
3814 goto out;
3815 }
3816
Sridhar Samudrala8abfedd2006-08-22 00:24:09 -07003817 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003818
3819 error = sctp_wait_for_accept(sk, timeo);
3820 if (error)
3821 goto out;
3822
3823 /* We treat the list of associations on the endpoint as the accept
3824 * queue and pick the first association on the list.
3825 */
3826 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3827
3828 newsk = sp->pf->create_accept_sk(sk, asoc);
3829 if (!newsk) {
3830 error = -ENOMEM;
3831 goto out;
3832 }
3833
3834 /* Populate the fields of the newsk from the oldsk and migrate the
3835 * asoc to the newsk.
3836 */
3837 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3838
3839out:
3840 sctp_release_sock(sk);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003841 *err = error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003842 return newsk;
3843}
3844
3845/* The SCTP ioctl handler. */
3846SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3847{
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003848 int rc = -ENOTCONN;
3849
3850 sctp_lock_sock(sk);
3851
3852 /*
3853 * SEQPACKET-style sockets in LISTENING state are valid, for
3854 * SCTP, so only discard TCP-style sockets in LISTENING state.
3855 */
3856 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3857 goto out;
3858
3859 switch (cmd) {
3860 case SIOCINQ: {
3861 struct sk_buff *skb;
3862 unsigned int amount = 0;
3863
3864 skb = skb_peek(&sk->sk_receive_queue);
3865 if (skb != NULL) {
3866 /*
3867 * We will only return the amount of this packet since
3868 * that is all that will be read.
3869 */
3870 amount = skb->len;
3871 }
3872 rc = put_user(amount, (int __user *)arg);
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003873 break;
David S. Miller9a7241c2010-10-03 22:14:37 -07003874 }
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003875 default:
3876 rc = -ENOIOCTLCMD;
3877 break;
3878 }
3879out:
3880 sctp_release_sock(sk);
3881 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003882}
3883
3884/* This is the function which gets called during socket creation to
3885 * initialized the SCTP-specific portion of the sock.
3886 * The sock structure should already be zero-filled memory.
3887 */
3888SCTP_STATIC int sctp_init_sock(struct sock *sk)
3889{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003890 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003891 struct sctp_endpoint *ep;
3892 struct sctp_sock *sp;
3893
3894 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
3895
3896 sp = sctp_sk(sk);
3897
3898 /* Initialize the SCTP per socket area. */
3899 switch (sk->sk_type) {
3900 case SOCK_SEQPACKET:
3901 sp->type = SCTP_SOCKET_UDP;
3902 break;
3903 case SOCK_STREAM:
3904 sp->type = SCTP_SOCKET_TCP;
3905 break;
3906 default:
3907 return -ESOCKTNOSUPPORT;
3908 }
3909
3910 /* Initialize default send parameters. These parameters can be
3911 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3912 */
3913 sp->default_stream = 0;
3914 sp->default_ppid = 0;
3915 sp->default_flags = 0;
3916 sp->default_context = 0;
3917 sp->default_timetolive = 0;
3918
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003919 sp->default_rcv_context = 0;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003920 sp->max_burst = net->sctp.max_burst;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003921
Neil Horman3c681982012-10-24 09:20:03 +00003922 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
3923
Linus Torvalds1da177e2005-04-16 15:20:36 -07003924 /* Initialize default setup parameters. These parameters
3925 * can be modified with the SCTP_INITMSG socket option or
3926 * overridden by the SCTP_INIT CMSG.
3927 */
3928 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
3929 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003930 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
3931 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003932
3933 /* Initialize default RTO related parameters. These parameters can
3934 * be modified for with the SCTP_RTOINFO socket option.
3935 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003936 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
3937 sp->rtoinfo.srto_max = net->sctp.rto_max;
3938 sp->rtoinfo.srto_min = net->sctp.rto_min;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003939
3940 /* Initialize default association related parameters. These parameters
3941 * can be modified with the SCTP_ASSOCINFO socket option.
3942 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003943 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003944 sp->assocparams.sasoc_number_peer_destinations = 0;
3945 sp->assocparams.sasoc_peer_rwnd = 0;
3946 sp->assocparams.sasoc_local_rwnd = 0;
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003947 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003948
3949 /* Initialize default event subscriptions. By default, all the
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003950 * options are off.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003951 */
3952 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3953
3954 /* Default Peer Address Parameters. These defaults can
3955 * be modified via SCTP_PEER_ADDR_PARAMS
3956 */
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003957 sp->hbinterval = net->sctp.hb_interval;
3958 sp->pathmaxrxt = net->sctp.max_retrans_path;
Frank Filz52ccb8e2005-12-22 11:36:46 -08003959 sp->pathmtu = 0; // allow default discovery
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00003960 sp->sackdelay = net->sctp.sack_timeout;
Vlad Yasevich7bfe8bd2008-06-09 15:45:05 -07003961 sp->sackfreq = 2;
Frank Filz52ccb8e2005-12-22 11:36:46 -08003962 sp->param_flags = SPP_HB_ENABLE |
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003963 SPP_PMTUD_ENABLE |
3964 SPP_SACKDELAY_ENABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003965
3966 /* If enabled no SCTP message fragmentation will be performed.
3967 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3968 */
3969 sp->disable_fragments = 0;
3970
Sridhar Samudrala208edef2006-09-29 17:08:01 -07003971 /* Enable Nagle algorithm by default. */
3972 sp->nodelay = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003973
3974 /* Enable by default. */
3975 sp->v4mapped = 1;
3976
3977 /* Auto-close idle associations after the configured
3978 * number of seconds. A value of 0 disables this
3979 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3980 * for UDP-style sockets only.
3981 */
3982 sp->autoclose = 0;
3983
3984 /* User specified fragmentation limit. */
3985 sp->user_frag = 0;
3986
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003987 sp->adaptation_ind = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003988
3989 sp->pf = sctp_get_pf_specific(sk->sk_family);
3990
3991 /* Control variables for partial data delivery. */
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003992 atomic_set(&sp->pd_mode, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003993 skb_queue_head_init(&sp->pd_lobby);
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003994 sp->frag_interleave = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003995
3996 /* Create a per socket endpoint structure. Even if we
3997 * change the data structure relationships, this may still
3998 * be useful for storing pre-connect address information.
3999 */
4000 ep = sctp_endpoint_new(sk, GFP_KERNEL);
4001 if (!ep)
4002 return -ENOMEM;
4003
4004 sp->ep = ep;
4005 sp->hmac = NULL;
4006
4007 SCTP_DBG_OBJCNT_INC(sock);
David S. Miller6f756a82008-11-23 17:34:03 -08004008
4009 local_bh_disable();
Vlad Yasevich81419d82010-04-28 08:47:20 +00004010 percpu_counter_inc(&sctp_sockets_allocated);
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004011 sock_prot_inuse_add(net, sk->sk_prot, 1);
4012 if (net->sctp.default_auto_asconf) {
Michio Honda9f7d6532011-04-26 19:32:51 +09004013 list_add_tail(&sp->auto_asconf_list,
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00004014 &net->sctp.auto_asconf_splist);
Michio Honda9f7d6532011-04-26 19:32:51 +09004015 sp->do_auto_asconf = 1;
4016 } else
4017 sp->do_auto_asconf = 0;
David S. Miller6f756a82008-11-23 17:34:03 -08004018 local_bh_enable();
4019
Linus Torvalds1da177e2005-04-16 15:20:36 -07004020 return 0;
4021}
4022
4023/* Cleanup any SCTP per socket resources. */
Brian Haley7d06b2e2008-06-14 17:04:49 -07004024SCTP_STATIC void sctp_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004025{
Michio Honda9f7d6532011-04-26 19:32:51 +09004026 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004027
4028 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
4029
4030 /* Release our hold on the endpoint. */
Michio Honda9f7d6532011-04-26 19:32:51 +09004031 sp = sctp_sk(sk);
Daniel Borkmann1abd1652013-06-06 15:53:47 +02004032 /* This could happen during socket init, thus we bail out
4033 * early, since the rest of the below is not setup either.
4034 */
4035 if (sp->ep == NULL)
4036 return;
4037
Michio Honda9f7d6532011-04-26 19:32:51 +09004038 if (sp->do_auto_asconf) {
4039 sp->do_auto_asconf = 0;
4040 list_del(&sp->auto_asconf_list);
4041 }
4042 sctp_endpoint_free(sp->ep);
Eric Dumazet5bc0b3b2008-11-25 13:53:27 -08004043 local_bh_disable();
Vlad Yasevich81419d82010-04-28 08:47:20 +00004044 percpu_counter_dec(&sctp_sockets_allocated);
Eric Dumazet9a57f7f2008-11-17 02:41:00 -08004045 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
Eric Dumazet5bc0b3b2008-11-25 13:53:27 -08004046 local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004047}
4048
4049/* API 4.1.7 shutdown() - TCP Style Syntax
4050 * int shutdown(int socket, int how);
4051 *
4052 * sd - the socket descriptor of the association to be closed.
4053 * how - Specifies the type of shutdown. The values are
4054 * as follows:
4055 * SHUT_RD
4056 * Disables further receive operations. No SCTP
4057 * protocol action is taken.
4058 * SHUT_WR
4059 * Disables further send operations, and initiates
4060 * the SCTP shutdown sequence.
4061 * SHUT_RDWR
4062 * Disables further send and receive operations
4063 * and initiates the SCTP shutdown sequence.
4064 */
4065SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
4066{
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00004067 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004068 struct sctp_endpoint *ep;
4069 struct sctp_association *asoc;
4070
4071 if (!sctp_style(sk, TCP))
4072 return;
4073
4074 if (how & SEND_SHUTDOWN) {
4075 ep = sctp_sk(sk)->ep;
4076 if (!list_empty(&ep->asocs)) {
4077 asoc = list_entry(ep->asocs.next,
4078 struct sctp_association, asocs);
Eric W. Biederman55e26eb2012-08-07 07:25:24 +00004079 sctp_primitive_SHUTDOWN(net, asoc, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004080 }
4081 }
4082}
4083
4084/* 7.2.1 Association Status (SCTP_STATUS)
4085
4086 * Applications can retrieve current status information about an
4087 * association, including association state, peer receiver window size,
4088 * number of unacked data chunks, and number of data chunks pending
4089 * receipt. This information is read-only.
4090 */
4091static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4092 char __user *optval,
4093 int __user *optlen)
4094{
4095 struct sctp_status status;
4096 struct sctp_association *asoc = NULL;
4097 struct sctp_transport *transport;
4098 sctp_assoc_t associd;
4099 int retval = 0;
4100
Neil Horman408f22e2007-06-16 14:03:45 -04004101 if (len < sizeof(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004102 retval = -EINVAL;
4103 goto out;
4104 }
4105
Neil Horman408f22e2007-06-16 14:03:45 -04004106 len = sizeof(status);
4107 if (copy_from_user(&status, optval, len)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004108 retval = -EFAULT;
4109 goto out;
4110 }
4111
4112 associd = status.sstat_assoc_id;
4113 asoc = sctp_id2assoc(sk, associd);
4114 if (!asoc) {
4115 retval = -EINVAL;
4116 goto out;
4117 }
4118
4119 transport = asoc->peer.primary_path;
4120
4121 status.sstat_assoc_id = sctp_assoc2id(asoc);
4122 status.sstat_state = asoc->state;
4123 status.sstat_rwnd = asoc->peer.rwnd;
4124 status.sstat_unackdata = asoc->unack_data;
4125
4126 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4127 status.sstat_instrms = asoc->c.sinit_max_instreams;
4128 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4129 status.sstat_fragmentation_point = asoc->frag_point;
4130 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
Al Viro8cec6b82006-11-20 17:23:01 -08004131 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4132 transport->af_specific->sockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004133 /* Map ipv4 address into v4-mapped-on-v6 address. */
4134 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4135 (union sctp_addr *)&status.sstat_primary.spinfo_address);
Frank Filz3f7a87d2005-06-20 13:14:57 -07004136 status.sstat_primary.spinfo_state = transport->state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004137 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4138 status.sstat_primary.spinfo_srtt = transport->srtt;
4139 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
Frank Filz52ccb8e2005-12-22 11:36:46 -08004140 status.sstat_primary.spinfo_mtu = transport->pathmtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004141
Frank Filz3f7a87d2005-06-20 13:14:57 -07004142 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4143 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4144
Linus Torvalds1da177e2005-04-16 15:20:36 -07004145 if (put_user(len, optlen)) {
4146 retval = -EFAULT;
4147 goto out;
4148 }
4149
4150 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
4151 len, status.sstat_state, status.sstat_rwnd,
4152 status.sstat_assoc_id);
4153
4154 if (copy_to_user(optval, &status, len)) {
4155 retval = -EFAULT;
4156 goto out;
4157 }
4158
4159out:
Eric Dumazeta02cec22010-09-22 20:43:57 +00004160 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004161}
4162
4163
4164/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4165 *
4166 * Applications can retrieve information about a specific peer address
4167 * of an association, including its reachability state, congestion
4168 * window, and retransmission timer values. This information is
4169 * read-only.
4170 */
4171static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4172 char __user *optval,
4173 int __user *optlen)
4174{
4175 struct sctp_paddrinfo pinfo;
4176 struct sctp_transport *transport;
4177 int retval = 0;
4178
Neil Horman408f22e2007-06-16 14:03:45 -04004179 if (len < sizeof(pinfo)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004180 retval = -EINVAL;
4181 goto out;
4182 }
4183
Neil Horman408f22e2007-06-16 14:03:45 -04004184 len = sizeof(pinfo);
4185 if (copy_from_user(&pinfo, optval, len)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004186 retval = -EFAULT;
4187 goto out;
4188 }
4189
4190 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4191 pinfo.spinfo_assoc_id);
4192 if (!transport)
4193 return -EINVAL;
4194
4195 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
Frank Filz3f7a87d2005-06-20 13:14:57 -07004196 pinfo.spinfo_state = transport->state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004197 pinfo.spinfo_cwnd = transport->cwnd;
4198 pinfo.spinfo_srtt = transport->srtt;
4199 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
Frank Filz52ccb8e2005-12-22 11:36:46 -08004200 pinfo.spinfo_mtu = transport->pathmtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004201
Frank Filz3f7a87d2005-06-20 13:14:57 -07004202 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4203 pinfo.spinfo_state = SCTP_ACTIVE;
4204
Linus Torvalds1da177e2005-04-16 15:20:36 -07004205 if (put_user(len, optlen)) {
4206 retval = -EFAULT;
4207 goto out;
4208 }
4209
4210 if (copy_to_user(optval, &pinfo, len)) {
4211 retval = -EFAULT;
4212 goto out;
4213 }
4214
4215out:
Eric Dumazeta02cec22010-09-22 20:43:57 +00004216 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004217}
4218
4219/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4220 *
4221 * This option is a on/off flag. If enabled no SCTP message
4222 * fragmentation will be performed. Instead if a message being sent
4223 * exceeds the current PMTU size, the message will NOT be sent and
4224 * instead a error will be indicated to the user.
4225 */
4226static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4227 char __user *optval, int __user *optlen)
4228{
4229 int val;
4230
4231 if (len < sizeof(int))
4232 return -EINVAL;
4233
4234 len = sizeof(int);
4235 val = (sctp_sk(sk)->disable_fragments == 1);
4236 if (put_user(len, optlen))
4237 return -EFAULT;
4238 if (copy_to_user(optval, &val, len))
4239 return -EFAULT;
4240 return 0;
4241}
4242
4243/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4244 *
4245 * This socket option is used to specify various notifications and
4246 * ancillary data the user wishes to receive.
4247 */
4248static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4249 int __user *optlen)
4250{
Thomas Grafacdd5982012-04-03 22:17:53 +00004251 if (len <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004252 return -EINVAL;
Thomas Grafacdd5982012-04-03 22:17:53 +00004253 if (len > sizeof(struct sctp_event_subscribe))
4254 len = sizeof(struct sctp_event_subscribe);
Neil Horman408f22e2007-06-16 14:03:45 -04004255 if (put_user(len, optlen))
4256 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004257 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4258 return -EFAULT;
4259 return 0;
4260}
4261
4262/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4263 *
4264 * This socket option is applicable to the UDP-style socket only. When
4265 * set it will cause associations that are idle for more than the
4266 * specified number of seconds to automatically close. An association
4267 * being idle is defined an association that has NOT sent or received
4268 * user data. The special value of '0' indicates that no automatic
4269 * close of any associations should be performed. The option expects an
4270 * integer defining the number of seconds of idle time before an
4271 * association is closed.
4272 */
4273static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4274{
4275 /* Applicable to UDP-style socket only */
4276 if (sctp_style(sk, TCP))
4277 return -EOPNOTSUPP;
Neil Horman408f22e2007-06-16 14:03:45 -04004278 if (len < sizeof(int))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004279 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004280 len = sizeof(int);
4281 if (put_user(len, optlen))
4282 return -EFAULT;
4283 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004284 return -EFAULT;
4285 return 0;
4286}
4287
4288/* Helper routine to branch off an association to a new socket. */
Benjamin Poirier0343c552012-03-08 05:55:58 +00004289int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004290{
Benjamin Poirier0343c552012-03-08 05:55:58 +00004291 struct sctp_association *asoc = sctp_id2assoc(sk, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004292 struct socket *sock;
Vlad Yasevichd570ee42007-05-15 16:32:39 -04004293 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004294 int err = 0;
4295
Benjamin Poirier0343c552012-03-08 05:55:58 +00004296 if (!asoc)
4297 return -EINVAL;
4298
Linus Torvalds1da177e2005-04-16 15:20:36 -07004299 /* An association cannot be branched off from an already peeled-off
4300 * socket, nor is this supported for tcp style sockets.
4301 */
4302 if (!sctp_style(sk, UDP))
4303 return -EINVAL;
4304
4305 /* Create a new socket. */
4306 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4307 if (err < 0)
4308 return err;
4309
Vlad Yasevich914e1c82009-02-13 08:33:44 +00004310 sctp_copy_sock(sock->sk, sk, asoc);
Vlad Yasevich4f444302006-10-30 18:54:32 -08004311
4312 /* Make peeled-off sockets more like 1-1 accepted sockets.
4313 * Set the daddr and initialize id to something more random
4314 */
Vlad Yasevichd570ee42007-05-15 16:32:39 -04004315 af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
4316 af->to_sk_daddr(&asoc->peer.primary_addr, sk);
Vlad Yasevich914e1c82009-02-13 08:33:44 +00004317
4318 /* Populate the fields of the newsk from the oldsk and migrate the
4319 * asoc to the newsk.
4320 */
4321 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
Vlad Yasevich4f444302006-10-30 18:54:32 -08004322
Linus Torvalds1da177e2005-04-16 15:20:36 -07004323 *sockp = sock;
4324
4325 return err;
4326}
Benjamin Poirier0343c552012-03-08 05:55:58 +00004327EXPORT_SYMBOL(sctp_do_peeloff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004328
4329static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4330{
4331 sctp_peeloff_arg_t peeloff;
4332 struct socket *newsock;
Al Viro56b31d12012-08-18 00:25:51 -04004333 struct file *newfile;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004334 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004335
Neil Horman408f22e2007-06-16 14:03:45 -04004336 if (len < sizeof(sctp_peeloff_arg_t))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004337 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004338 len = sizeof(sctp_peeloff_arg_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004339 if (copy_from_user(&peeloff, optval, len))
4340 return -EFAULT;
4341
Benjamin Poirier0343c552012-03-08 05:55:58 +00004342 retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004343 if (retval < 0)
4344 goto out;
4345
4346 /* Map the socket to an unused fd that can be returned to the user. */
Al Viro56b31d12012-08-18 00:25:51 -04004347 retval = get_unused_fd();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004348 if (retval < 0) {
4349 sock_release(newsock);
4350 goto out;
4351 }
4352
Linus Torvaldsaab174f2012-10-02 20:25:04 -07004353 newfile = sock_alloc_file(newsock, 0, NULL);
Al Viro56b31d12012-08-18 00:25:51 -04004354 if (unlikely(IS_ERR(newfile))) {
4355 put_unused_fd(retval);
4356 sock_release(newsock);
4357 return PTR_ERR(newfile);
4358 }
4359
Benjamin Poirier0343c552012-03-08 05:55:58 +00004360 SCTP_DEBUG_PRINTK("%s: sk: %p newsk: %p sd: %d\n",
4361 __func__, sk, newsock->sk, retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004362
4363 /* Return the fd mapped to the new socket. */
Al Viro56b31d12012-08-18 00:25:51 -04004364 if (put_user(len, optlen)) {
4365 fput(newfile);
4366 put_unused_fd(retval);
Neil Horman408f22e2007-06-16 14:03:45 -04004367 return -EFAULT;
Al Viro56b31d12012-08-18 00:25:51 -04004368 }
4369 peeloff.sd = retval;
4370 if (copy_to_user(optval, &peeloff, len)) {
4371 fput(newfile);
4372 put_unused_fd(retval);
4373 return -EFAULT;
4374 }
4375 fd_install(retval, newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004376out:
4377 return retval;
4378}
4379
4380/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4381 *
4382 * Applications can enable or disable heartbeats for any peer address of
4383 * an association, modify an address's heartbeat interval, force a
4384 * heartbeat to be sent immediately, and adjust the address's maximum
4385 * number of retransmissions sent before an address is considered
4386 * unreachable. The following structure is used to access and modify an
4387 * address's parameters:
4388 *
4389 * struct sctp_paddrparams {
Frank Filz52ccb8e2005-12-22 11:36:46 -08004390 * sctp_assoc_t spp_assoc_id;
4391 * struct sockaddr_storage spp_address;
4392 * uint32_t spp_hbinterval;
4393 * uint16_t spp_pathmaxrxt;
4394 * uint32_t spp_pathmtu;
4395 * uint32_t spp_sackdelay;
4396 * uint32_t spp_flags;
4397 * };
Linus Torvalds1da177e2005-04-16 15:20:36 -07004398 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08004399 * spp_assoc_id - (one-to-many style socket) This is filled in the
4400 * application, and identifies the association for
4401 * this query.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004402 * spp_address - This specifies which address is of interest.
4403 * spp_hbinterval - This contains the value of the heartbeat interval,
Frank Filz52ccb8e2005-12-22 11:36:46 -08004404 * in milliseconds. If a value of zero
4405 * is present in this field then no changes are to
4406 * be made to this parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004407 * spp_pathmaxrxt - This contains the maximum number of
4408 * retransmissions before this address shall be
Frank Filz52ccb8e2005-12-22 11:36:46 -08004409 * considered unreachable. If a value of zero
4410 * is present in this field then no changes are to
4411 * be made to this parameter.
4412 * spp_pathmtu - When Path MTU discovery is disabled the value
4413 * specified here will be the "fixed" path mtu.
4414 * Note that if the spp_address field is empty
4415 * then all associations on this address will
4416 * have this fixed path mtu set upon them.
4417 *
4418 * spp_sackdelay - When delayed sack is enabled, this value specifies
4419 * the number of milliseconds that sacks will be delayed
4420 * for. This value will apply to all addresses of an
4421 * association if the spp_address field is empty. Note
4422 * also, that if delayed sack is enabled and this
4423 * value is set to 0, no change is made to the last
4424 * recorded delayed sack timer value.
4425 *
4426 * spp_flags - These flags are used to control various features
4427 * on an association. The flag field may contain
4428 * zero or more of the following options.
4429 *
4430 * SPP_HB_ENABLE - Enable heartbeats on the
4431 * specified address. Note that if the address
4432 * field is empty all addresses for the association
4433 * have heartbeats enabled upon them.
4434 *
4435 * SPP_HB_DISABLE - Disable heartbeats on the
4436 * speicifed address. Note that if the address
4437 * field is empty all addresses for the association
4438 * will have their heartbeats disabled. Note also
4439 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4440 * mutually exclusive, only one of these two should
4441 * be specified. Enabling both fields will have
4442 * undetermined results.
4443 *
4444 * SPP_HB_DEMAND - Request a user initiated heartbeat
4445 * to be made immediately.
4446 *
4447 * SPP_PMTUD_ENABLE - This field will enable PMTU
4448 * discovery upon the specified address. Note that
4449 * if the address feild is empty then all addresses
4450 * on the association are effected.
4451 *
4452 * SPP_PMTUD_DISABLE - This field will disable PMTU
4453 * discovery upon the specified address. Note that
4454 * if the address feild is empty then all addresses
4455 * on the association are effected. Not also that
4456 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4457 * exclusive. Enabling both will have undetermined
4458 * results.
4459 *
4460 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4461 * on delayed sack. The time specified in spp_sackdelay
4462 * is used to specify the sack delay for this address. Note
4463 * that if spp_address is empty then all addresses will
4464 * enable delayed sack and take on the sack delay
4465 * value specified in spp_sackdelay.
4466 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4467 * off delayed sack. If the spp_address field is blank then
4468 * delayed sack is disabled for the entire association. Note
4469 * also that this field is mutually exclusive to
4470 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4471 * results.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004472 */
4473static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
Frank Filz52ccb8e2005-12-22 11:36:46 -08004474 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004475{
Frank Filz52ccb8e2005-12-22 11:36:46 -08004476 struct sctp_paddrparams params;
4477 struct sctp_transport *trans = NULL;
4478 struct sctp_association *asoc = NULL;
4479 struct sctp_sock *sp = sctp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004480
Neil Horman408f22e2007-06-16 14:03:45 -04004481 if (len < sizeof(struct sctp_paddrparams))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004482 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004483 len = sizeof(struct sctp_paddrparams);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004484 if (copy_from_user(&params, optval, len))
4485 return -EFAULT;
4486
Frank Filz52ccb8e2005-12-22 11:36:46 -08004487 /* If an address other than INADDR_ANY is specified, and
4488 * no transport is found, then the request is invalid.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004489 */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -04004490 if (!sctp_is_any(sk, ( union sctp_addr *)&params.spp_address)) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08004491 trans = sctp_addr_id2transport(sk, &params.spp_address,
4492 params.spp_assoc_id);
4493 if (!trans) {
4494 SCTP_DEBUG_PRINTK("Failed no transport\n");
4495 return -EINVAL;
4496 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004497 }
4498
Frank Filz52ccb8e2005-12-22 11:36:46 -08004499 /* Get association, if assoc_id != 0 and the socket is a one
4500 * to many style socket, and an association was not found, then
4501 * the id was invalid.
4502 */
4503 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4504 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4505 SCTP_DEBUG_PRINTK("Failed no association\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004506 return -EINVAL;
Frank Filz52ccb8e2005-12-22 11:36:46 -08004507 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004508
Frank Filz52ccb8e2005-12-22 11:36:46 -08004509 if (trans) {
4510 /* Fetch transport values. */
4511 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4512 params.spp_pathmtu = trans->pathmtu;
4513 params.spp_pathmaxrxt = trans->pathmaxrxt;
4514 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004515
Frank Filz52ccb8e2005-12-22 11:36:46 -08004516 /*draft-11 doesn't say what to return in spp_flags*/
4517 params.spp_flags = trans->param_flags;
4518 } else if (asoc) {
4519 /* Fetch association values. */
4520 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4521 params.spp_pathmtu = asoc->pathmtu;
4522 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4523 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004524
Frank Filz52ccb8e2005-12-22 11:36:46 -08004525 /*draft-11 doesn't say what to return in spp_flags*/
4526 params.spp_flags = asoc->param_flags;
4527 } else {
4528 /* Fetch socket values. */
4529 params.spp_hbinterval = sp->hbinterval;
4530 params.spp_pathmtu = sp->pathmtu;
4531 params.spp_sackdelay = sp->sackdelay;
4532 params.spp_pathmaxrxt = sp->pathmaxrxt;
4533
4534 /*draft-11 doesn't say what to return in spp_flags*/
4535 params.spp_flags = sp->param_flags;
4536 }
4537
Linus Torvalds1da177e2005-04-16 15:20:36 -07004538 if (copy_to_user(optval, &params, len))
4539 return -EFAULT;
4540
4541 if (put_user(len, optlen))
4542 return -EFAULT;
4543
4544 return 0;
4545}
4546
Wei Yongjund364d922008-05-09 15:13:26 -07004547/*
4548 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
Frank Filz77086102005-12-22 11:37:30 -08004549 *
Wei Yongjund364d922008-05-09 15:13:26 -07004550 * This option will effect the way delayed acks are performed. This
4551 * option allows you to get or set the delayed ack time, in
4552 * milliseconds. It also allows changing the delayed ack frequency.
4553 * Changing the frequency to 1 disables the delayed sack algorithm. If
4554 * the assoc_id is 0, then this sets or gets the endpoints default
4555 * values. If the assoc_id field is non-zero, then the set or get
4556 * effects the specified association for the one to many model (the
4557 * assoc_id field is ignored by the one to one model). Note that if
4558 * sack_delay or sack_freq are 0 when setting this option, then the
4559 * current values will remain unchanged.
Frank Filz77086102005-12-22 11:37:30 -08004560 *
Wei Yongjund364d922008-05-09 15:13:26 -07004561 * struct sctp_sack_info {
4562 * sctp_assoc_t sack_assoc_id;
4563 * uint32_t sack_delay;
4564 * uint32_t sack_freq;
4565 * };
Frank Filz77086102005-12-22 11:37:30 -08004566 *
Wei Yongjund364d922008-05-09 15:13:26 -07004567 * sack_assoc_id - This parameter, indicates which association the user
4568 * is performing an action upon. Note that if this field's value is
4569 * zero then the endpoints default value is changed (effecting future
4570 * associations only).
Frank Filz77086102005-12-22 11:37:30 -08004571 *
Wei Yongjund364d922008-05-09 15:13:26 -07004572 * sack_delay - This parameter contains the number of milliseconds that
4573 * the user is requesting the delayed ACK timer be set to. Note that
4574 * this value is defined in the standard to be between 200 and 500
4575 * milliseconds.
Frank Filz77086102005-12-22 11:37:30 -08004576 *
Wei Yongjund364d922008-05-09 15:13:26 -07004577 * sack_freq - This parameter contains the number of packets that must
4578 * be received before a sack is sent without waiting for the delay
4579 * timer to expire. The default value for this is 2, setting this
4580 * value to 1 will disable the delayed sack algorithm.
Frank Filz77086102005-12-22 11:37:30 -08004581 */
Wei Yongjund364d922008-05-09 15:13:26 -07004582static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
Frank Filz77086102005-12-22 11:37:30 -08004583 char __user *optval,
4584 int __user *optlen)
4585{
Wei Yongjund364d922008-05-09 15:13:26 -07004586 struct sctp_sack_info params;
Frank Filz77086102005-12-22 11:37:30 -08004587 struct sctp_association *asoc = NULL;
4588 struct sctp_sock *sp = sctp_sk(sk);
4589
Wei Yongjund364d922008-05-09 15:13:26 -07004590 if (len >= sizeof(struct sctp_sack_info)) {
4591 len = sizeof(struct sctp_sack_info);
4592
4593 if (copy_from_user(&params, optval, len))
4594 return -EFAULT;
4595 } else if (len == sizeof(struct sctp_assoc_value)) {
Joe Perches145ce502010-08-24 13:21:08 +00004596 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4597 pr_warn("Use struct sctp_sack_info instead\n");
Wei Yongjund364d922008-05-09 15:13:26 -07004598 if (copy_from_user(&params, optval, len))
4599 return -EFAULT;
4600 } else
Frank Filz77086102005-12-22 11:37:30 -08004601 return - EINVAL;
4602
Wei Yongjund364d922008-05-09 15:13:26 -07004603 /* Get association, if sack_assoc_id != 0 and the socket is a one
Frank Filz77086102005-12-22 11:37:30 -08004604 * to many style socket, and an association was not found, then
4605 * the id was invalid.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004606 */
Wei Yongjund364d922008-05-09 15:13:26 -07004607 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4608 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
Frank Filz77086102005-12-22 11:37:30 -08004609 return -EINVAL;
4610
4611 if (asoc) {
4612 /* Fetch association values. */
Wei Yongjund364d922008-05-09 15:13:26 -07004613 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4614 params.sack_delay = jiffies_to_msecs(
Frank Filz77086102005-12-22 11:37:30 -08004615 asoc->sackdelay);
Wei Yongjund364d922008-05-09 15:13:26 -07004616 params.sack_freq = asoc->sackfreq;
4617
4618 } else {
4619 params.sack_delay = 0;
4620 params.sack_freq = 1;
4621 }
Frank Filz77086102005-12-22 11:37:30 -08004622 } else {
4623 /* Fetch socket values. */
Wei Yongjund364d922008-05-09 15:13:26 -07004624 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4625 params.sack_delay = sp->sackdelay;
4626 params.sack_freq = sp->sackfreq;
4627 } else {
4628 params.sack_delay = 0;
4629 params.sack_freq = 1;
4630 }
Frank Filz77086102005-12-22 11:37:30 -08004631 }
4632
4633 if (copy_to_user(optval, &params, len))
4634 return -EFAULT;
4635
4636 if (put_user(len, optlen))
4637 return -EFAULT;
4638
4639 return 0;
4640}
4641
Linus Torvalds1da177e2005-04-16 15:20:36 -07004642/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4643 *
4644 * Applications can specify protocol parameters for the default association
4645 * initialization. The option name argument to setsockopt() and getsockopt()
4646 * is SCTP_INITMSG.
4647 *
4648 * Setting initialization parameters is effective only on an unconnected
4649 * socket (for UDP-style sockets only future associations are effected
4650 * by the change). With TCP-style sockets, this option is inherited by
4651 * sockets derived from a listener socket.
4652 */
4653static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4654{
Neil Horman408f22e2007-06-16 14:03:45 -04004655 if (len < sizeof(struct sctp_initmsg))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004656 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004657 len = sizeof(struct sctp_initmsg);
4658 if (put_user(len, optlen))
4659 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004660 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4661 return -EFAULT;
4662 return 0;
4663}
4664
Linus Torvalds1da177e2005-04-16 15:20:36 -07004665
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004666static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4667 char __user *optval, int __user *optlen)
4668{
4669 struct sctp_association *asoc;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004670 int cnt = 0;
4671 struct sctp_getaddrs getaddrs;
4672 struct sctp_transport *from;
4673 void __user *to;
4674 union sctp_addr temp;
4675 struct sctp_sock *sp = sctp_sk(sk);
4676 int addrlen;
4677 size_t space_left;
4678 int bytes_copied;
4679
4680 if (len < sizeof(struct sctp_getaddrs))
4681 return -EINVAL;
4682
4683 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4684 return -EFAULT;
4685
4686 /* For UDP-style sockets, id specifies the association to query. */
4687 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4688 if (!asoc)
4689 return -EINVAL;
4690
4691 to = optval + offsetof(struct sctp_getaddrs,addrs);
Neil Horman186e2342007-06-18 19:59:16 -04004692 space_left = len - offsetof(struct sctp_getaddrs,addrs);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004693
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07004694 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4695 transports) {
Al Virob3f5b3b2006-11-20 17:22:43 -08004696 memcpy(&temp, &from->ipaddr, sizeof(temp));
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004697 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
Vlad Yasevicha5f4cea2010-04-30 21:42:42 -04004698 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004699 if (space_left < addrlen)
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004700 return -ENOMEM;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004701 if (copy_to_user(to, &temp, addrlen))
4702 return -EFAULT;
4703 to += addrlen;
4704 cnt++;
4705 space_left -= addrlen;
4706 }
4707
4708 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4709 return -EFAULT;
4710 bytes_copied = ((char __user *)to) - optval;
4711 if (put_user(bytes_copied, optlen))
4712 return -EFAULT;
4713
4714 return 0;
4715}
4716
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004717static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4718 size_t space_left, int *bytes_copied)
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004719{
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004720 struct sctp_sockaddr_entry *addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004721 union sctp_addr temp;
4722 int cnt = 0;
4723 int addrlen;
Eric W. Biederman4db67e82012-08-06 08:42:04 +00004724 struct net *net = sock_net(sk);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004725
Vlad Yasevich29303542007-09-16 16:02:12 -07004726 rcu_read_lock();
Eric W. Biederman4db67e82012-08-06 08:42:04 +00004727 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
Vlad Yasevich29303542007-09-16 16:02:12 -07004728 if (!addr->valid)
4729 continue;
4730
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004731 if ((PF_INET == sk->sk_family) &&
Al Viro6244be42006-11-20 17:21:44 -08004732 (AF_INET6 == addr->a.sa.sa_family))
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004733 continue;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07004734 if ((PF_INET6 == sk->sk_family) &&
4735 inet_v6_ipv6only(sk) &&
4736 (AF_INET == addr->a.sa.sa_family))
4737 continue;
Al Viro6244be42006-11-20 17:21:44 -08004738 memcpy(&temp, &addr->a, sizeof(temp));
Vlad Yasevichb46ae362008-01-28 14:25:36 -05004739 if (!temp.v4.sin_port)
4740 temp.v4.sin_port = htons(port);
4741
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004742 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4743 &temp);
4744 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
Vlad Yasevich29303542007-09-16 16:02:12 -07004745 if (space_left < addrlen) {
4746 cnt = -ENOMEM;
4747 break;
4748 }
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004749 memcpy(to, &temp, addrlen);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -08004750
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004751 to += addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004752 cnt ++;
4753 space_left -= addrlen;
Vlad Yasevich3663c302007-07-03 12:43:12 -04004754 *bytes_copied += addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004755 }
Vlad Yasevich29303542007-09-16 16:02:12 -07004756 rcu_read_unlock();
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004757
4758 return cnt;
4759}
4760
Linus Torvalds1da177e2005-04-16 15:20:36 -07004761
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004762static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4763 char __user *optval, int __user *optlen)
4764{
4765 struct sctp_bind_addr *bp;
4766 struct sctp_association *asoc;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004767 int cnt = 0;
4768 struct sctp_getaddrs getaddrs;
4769 struct sctp_sockaddr_entry *addr;
4770 void __user *to;
4771 union sctp_addr temp;
4772 struct sctp_sock *sp = sctp_sk(sk);
4773 int addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004774 int err = 0;
4775 size_t space_left;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004776 int bytes_copied = 0;
4777 void *addrs;
Vlad Yasevich70b57b82007-05-09 13:51:31 -07004778 void *buf;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004779
Neil Horman408f22e2007-06-16 14:03:45 -04004780 if (len < sizeof(struct sctp_getaddrs))
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004781 return -EINVAL;
4782
4783 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4784 return -EFAULT;
4785
4786 /*
4787 * For UDP-style sockets, id specifies the association to query.
4788 * If the id field is set to the value '0' then the locally bound
4789 * addresses are returned without regard to any particular
4790 * association.
4791 */
4792 if (0 == getaddrs.assoc_id) {
4793 bp = &sctp_sk(sk)->ep->base.bind_addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004794 } else {
4795 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4796 if (!asoc)
4797 return -EINVAL;
4798 bp = &asoc->base.bind_addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004799 }
4800
4801 to = optval + offsetof(struct sctp_getaddrs,addrs);
Neil Horman186e2342007-06-18 19:59:16 -04004802 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4803
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004804 addrs = kmalloc(space_left, GFP_KERNEL);
4805 if (!addrs)
4806 return -ENOMEM;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004807
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004808 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4809 * addresses from the global local address list.
4810 */
4811 if (sctp_list_single_entry(&bp->address_list)) {
4812 addr = list_entry(bp->address_list.next,
4813 struct sctp_sockaddr_entry, list);
Vlad Yasevich52cae8f2008-08-18 10:34:34 -04004814 if (sctp_is_any(sk, &addr->a)) {
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004815 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4816 space_left, &bytes_copied);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004817 if (cnt < 0) {
4818 err = cnt;
Vlad Yasevich559cf712007-09-16 16:03:28 -07004819 goto out;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004820 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004821 goto copy_getaddrs;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004822 }
4823 }
4824
Vlad Yasevich70b57b82007-05-09 13:51:31 -07004825 buf = addrs;
Vlad Yasevich559cf712007-09-16 16:03:28 -07004826 /* Protection on the bound address list is not needed since
4827 * in the socket option context we hold a socket lock and
4828 * thus the bound address list can't change.
4829 */
4830 list_for_each_entry(addr, &bp->address_list, list) {
Al Viro6244be42006-11-20 17:21:44 -08004831 memcpy(&temp, &addr->a, sizeof(temp));
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004832 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4833 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004834 if (space_left < addrlen) {
4835 err = -ENOMEM; /*fixme: right error?*/
Vlad Yasevich559cf712007-09-16 16:03:28 -07004836 goto out;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004837 }
Vlad Yasevich70b57b82007-05-09 13:51:31 -07004838 memcpy(buf, &temp, addrlen);
4839 buf += addrlen;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004840 bytes_copied += addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004841 cnt ++;
4842 space_left -= addrlen;
4843 }
4844
4845copy_getaddrs:
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004846 if (copy_to_user(to, addrs, bytes_copied)) {
4847 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02004848 goto out;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004849 }
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04004850 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4851 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02004852 goto out;
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04004853 }
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004854 if (put_user(bytes_copied, optlen))
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04004855 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02004856out:
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004857 kfree(addrs);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004858 return err;
4859}
4860
Linus Torvalds1da177e2005-04-16 15:20:36 -07004861/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4862 *
4863 * Requests that the local SCTP stack use the enclosed peer address as
4864 * the association primary. The enclosed address must be one of the
4865 * association peer's addresses.
4866 */
4867static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4868 char __user *optval, int __user *optlen)
4869{
4870 struct sctp_prim prim;
4871 struct sctp_association *asoc;
4872 struct sctp_sock *sp = sctp_sk(sk);
4873
Neil Horman408f22e2007-06-16 14:03:45 -04004874 if (len < sizeof(struct sctp_prim))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004875 return -EINVAL;
4876
Neil Horman408f22e2007-06-16 14:03:45 -04004877 len = sizeof(struct sctp_prim);
4878
4879 if (copy_from_user(&prim, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004880 return -EFAULT;
4881
4882 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4883 if (!asoc)
4884 return -EINVAL;
4885
4886 if (!asoc->peer.primary_path)
4887 return -ENOTCONN;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004888
Al Viro8cec6b82006-11-20 17:23:01 -08004889 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4890 asoc->peer.primary_path->af_specific->sockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004891
4892 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4893 (union sctp_addr *)&prim.ssp_addr);
4894
Neil Horman408f22e2007-06-16 14:03:45 -04004895 if (put_user(len, optlen))
4896 return -EFAULT;
4897 if (copy_to_user(optval, &prim, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004898 return -EFAULT;
4899
4900 return 0;
4901}
4902
4903/*
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004904 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004905 *
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004906 * Requests that the local endpoint set the specified Adaptation Layer
Linus Torvalds1da177e2005-04-16 15:20:36 -07004907 * Indication parameter for all future INIT and INIT-ACK exchanges.
4908 */
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004909static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004910 char __user *optval, int __user *optlen)
4911{
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004912 struct sctp_setadaptation adaptation;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004913
Neil Horman408f22e2007-06-16 14:03:45 -04004914 if (len < sizeof(struct sctp_setadaptation))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004915 return -EINVAL;
4916
Neil Horman408f22e2007-06-16 14:03:45 -04004917 len = sizeof(struct sctp_setadaptation);
4918
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004919 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
Neil Horman408f22e2007-06-16 14:03:45 -04004920
4921 if (put_user(len, optlen))
4922 return -EFAULT;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004923 if (copy_to_user(optval, &adaptation, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004924 return -EFAULT;
Ivan Skytte Jorgensena1ab3582005-10-28 15:33:24 -07004925
Linus Torvalds1da177e2005-04-16 15:20:36 -07004926 return 0;
4927}
4928
4929/*
4930 *
4931 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4932 *
4933 * Applications that wish to use the sendto() system call may wish to
4934 * specify a default set of parameters that would normally be supplied
4935 * through the inclusion of ancillary data. This socket option allows
4936 * such an application to set the default sctp_sndrcvinfo structure.
4937
4938
4939 * The application that wishes to use this socket option simply passes
4940 * in to this call the sctp_sndrcvinfo structure defined in Section
4941 * 5.2.2) The input parameters accepted by this call include
4942 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4943 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4944 * to this call if the caller is using the UDP model.
4945 *
4946 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4947 */
4948static int sctp_getsockopt_default_send_param(struct sock *sk,
4949 int len, char __user *optval,
4950 int __user *optlen)
4951{
4952 struct sctp_sndrcvinfo info;
4953 struct sctp_association *asoc;
4954 struct sctp_sock *sp = sctp_sk(sk);
4955
Neil Horman408f22e2007-06-16 14:03:45 -04004956 if (len < sizeof(struct sctp_sndrcvinfo))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004957 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004958
4959 len = sizeof(struct sctp_sndrcvinfo);
4960
4961 if (copy_from_user(&info, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004962 return -EFAULT;
4963
4964 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4965 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4966 return -EINVAL;
4967
4968 if (asoc) {
4969 info.sinfo_stream = asoc->default_stream;
4970 info.sinfo_flags = asoc->default_flags;
4971 info.sinfo_ppid = asoc->default_ppid;
4972 info.sinfo_context = asoc->default_context;
4973 info.sinfo_timetolive = asoc->default_timetolive;
4974 } else {
4975 info.sinfo_stream = sp->default_stream;
4976 info.sinfo_flags = sp->default_flags;
4977 info.sinfo_ppid = sp->default_ppid;
4978 info.sinfo_context = sp->default_context;
4979 info.sinfo_timetolive = sp->default_timetolive;
4980 }
4981
Neil Horman408f22e2007-06-16 14:03:45 -04004982 if (put_user(len, optlen))
4983 return -EFAULT;
4984 if (copy_to_user(optval, &info, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004985 return -EFAULT;
4986
4987 return 0;
4988}
4989
4990/*
4991 *
4992 * 7.1.5 SCTP_NODELAY
4993 *
4994 * Turn on/off any Nagle-like algorithm. This means that packets are
4995 * generally sent as soon as possible and no unnecessary delays are
4996 * introduced, at the cost of more packets in the network. Expects an
4997 * integer boolean flag.
4998 */
4999
5000static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5001 char __user *optval, int __user *optlen)
5002{
5003 int val;
5004
5005 if (len < sizeof(int))
5006 return -EINVAL;
5007
5008 len = sizeof(int);
5009 val = (sctp_sk(sk)->nodelay == 1);
5010 if (put_user(len, optlen))
5011 return -EFAULT;
5012 if (copy_to_user(optval, &val, len))
5013 return -EFAULT;
5014 return 0;
5015}
5016
5017/*
5018 *
5019 * 7.1.1 SCTP_RTOINFO
5020 *
5021 * The protocol parameters used to initialize and bound retransmission
5022 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5023 * and modify these parameters.
5024 * All parameters are time values, in milliseconds. A value of 0, when
5025 * modifying the parameters, indicates that the current value should not
5026 * be changed.
5027 *
5028 */
5029static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5030 char __user *optval,
5031 int __user *optlen) {
5032 struct sctp_rtoinfo rtoinfo;
5033 struct sctp_association *asoc;
5034
Neil Horman408f22e2007-06-16 14:03:45 -04005035 if (len < sizeof (struct sctp_rtoinfo))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005036 return -EINVAL;
5037
Neil Horman408f22e2007-06-16 14:03:45 -04005038 len = sizeof(struct sctp_rtoinfo);
5039
5040 if (copy_from_user(&rtoinfo, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005041 return -EFAULT;
5042
5043 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5044
5045 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5046 return -EINVAL;
5047
5048 /* Values corresponding to the specific association. */
5049 if (asoc) {
5050 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5051 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5052 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5053 } else {
5054 /* Values corresponding to the endpoint. */
5055 struct sctp_sock *sp = sctp_sk(sk);
5056
5057 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5058 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5059 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5060 }
5061
5062 if (put_user(len, optlen))
5063 return -EFAULT;
5064
5065 if (copy_to_user(optval, &rtoinfo, len))
5066 return -EFAULT;
5067
5068 return 0;
5069}
5070
5071/*
5072 *
5073 * 7.1.2 SCTP_ASSOCINFO
5074 *
Michael Opdenacker59c51592007-05-09 08:57:56 +02005075 * This option is used to tune the maximum retransmission attempts
Linus Torvalds1da177e2005-04-16 15:20:36 -07005076 * of the association.
5077 * Returns an error if the new association retransmission value is
5078 * greater than the sum of the retransmission value of the peer.
5079 * See [SCTP] for more information.
5080 *
5081 */
5082static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5083 char __user *optval,
5084 int __user *optlen)
5085{
5086
5087 struct sctp_assocparams assocparams;
5088 struct sctp_association *asoc;
5089 struct list_head *pos;
5090 int cnt = 0;
5091
Neil Horman408f22e2007-06-16 14:03:45 -04005092 if (len < sizeof (struct sctp_assocparams))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005093 return -EINVAL;
5094
Neil Horman408f22e2007-06-16 14:03:45 -04005095 len = sizeof(struct sctp_assocparams);
5096
5097 if (copy_from_user(&assocparams, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005098 return -EFAULT;
5099
5100 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5101
5102 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5103 return -EINVAL;
5104
5105 /* Values correspoinding to the specific association */
Vladislav Yasevich17337212005-04-28 11:57:54 -07005106 if (asoc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005107 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5108 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5109 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5110 assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
5111 * 1000) +
5112 (asoc->cookie_life.tv_usec
5113 / 1000);
5114
5115 list_for_each(pos, &asoc->peer.transport_addr_list) {
5116 cnt ++;
5117 }
5118
5119 assocparams.sasoc_number_peer_destinations = cnt;
5120 } else {
5121 /* Values corresponding to the endpoint */
5122 struct sctp_sock *sp = sctp_sk(sk);
5123
5124 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5125 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5126 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5127 assocparams.sasoc_cookie_life =
5128 sp->assocparams.sasoc_cookie_life;
5129 assocparams.sasoc_number_peer_destinations =
5130 sp->assocparams.
5131 sasoc_number_peer_destinations;
5132 }
5133
5134 if (put_user(len, optlen))
5135 return -EFAULT;
5136
5137 if (copy_to_user(optval, &assocparams, len))
5138 return -EFAULT;
5139
5140 return 0;
5141}
5142
5143/*
5144 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5145 *
5146 * This socket option is a boolean flag which turns on or off mapped V4
5147 * addresses. If this option is turned on and the socket is type
5148 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5149 * If this option is turned off, then no mapping will be done of V4
5150 * addresses and a user will receive both PF_INET6 and PF_INET type
5151 * addresses on the socket.
5152 */
5153static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5154 char __user *optval, int __user *optlen)
5155{
5156 int val;
5157 struct sctp_sock *sp = sctp_sk(sk);
5158
5159 if (len < sizeof(int))
5160 return -EINVAL;
5161
5162 len = sizeof(int);
5163 val = sp->v4mapped;
5164 if (put_user(len, optlen))
5165 return -EFAULT;
5166 if (copy_to_user(optval, &val, len))
5167 return -EFAULT;
5168
5169 return 0;
5170}
5171
5172/*
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005173 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5174 * (chapter and verse is quoted at sctp_setsockopt_context())
5175 */
5176static int sctp_getsockopt_context(struct sock *sk, int len,
5177 char __user *optval, int __user *optlen)
5178{
5179 struct sctp_assoc_value params;
5180 struct sctp_sock *sp;
5181 struct sctp_association *asoc;
5182
Neil Horman408f22e2007-06-16 14:03:45 -04005183 if (len < sizeof(struct sctp_assoc_value))
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005184 return -EINVAL;
5185
Neil Horman408f22e2007-06-16 14:03:45 -04005186 len = sizeof(struct sctp_assoc_value);
5187
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005188 if (copy_from_user(&params, optval, len))
5189 return -EFAULT;
5190
5191 sp = sctp_sk(sk);
5192
5193 if (params.assoc_id != 0) {
5194 asoc = sctp_id2assoc(sk, params.assoc_id);
5195 if (!asoc)
5196 return -EINVAL;
5197 params.assoc_value = asoc->default_rcv_context;
5198 } else {
5199 params.assoc_value = sp->default_rcv_context;
5200 }
5201
5202 if (put_user(len, optlen))
5203 return -EFAULT;
5204 if (copy_to_user(optval, &params, len))
5205 return -EFAULT;
5206
5207 return 0;
5208}
5209
5210/*
Wei Yongjune89c2092008-12-25 16:54:58 -08005211 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5212 * This option will get or set the maximum size to put in any outgoing
5213 * SCTP DATA chunk. If a message is larger than this size it will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07005214 * fragmented by SCTP into the specified size. Note that the underlying
5215 * SCTP implementation may fragment into smaller sized chunks when the
5216 * PMTU of the underlying association is smaller than the value set by
Wei Yongjune89c2092008-12-25 16:54:58 -08005217 * the user. The default value for this option is '0' which indicates
5218 * the user is NOT limiting fragmentation and only the PMTU will effect
5219 * SCTP's choice of DATA chunk size. Note also that values set larger
5220 * than the maximum size of an IP datagram will effectively let SCTP
5221 * control fragmentation (i.e. the same as setting this option to 0).
5222 *
5223 * The following structure is used to access and modify this parameter:
5224 *
5225 * struct sctp_assoc_value {
5226 * sctp_assoc_t assoc_id;
5227 * uint32_t assoc_value;
5228 * };
5229 *
5230 * assoc_id: This parameter is ignored for one-to-one style sockets.
5231 * For one-to-many style sockets this parameter indicates which
5232 * association the user is performing an action upon. Note that if
5233 * this field's value is zero then the endpoints default value is
5234 * changed (effecting future associations only).
5235 * assoc_value: This parameter specifies the maximum size in bytes.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005236 */
5237static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5238 char __user *optval, int __user *optlen)
5239{
Wei Yongjune89c2092008-12-25 16:54:58 -08005240 struct sctp_assoc_value params;
5241 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005242
Wei Yongjune89c2092008-12-25 16:54:58 -08005243 if (len == sizeof(int)) {
Joe Perches145ce502010-08-24 13:21:08 +00005244 pr_warn("Use of int in maxseg socket option deprecated\n");
5245 pr_warn("Use struct sctp_assoc_value instead\n");
Wei Yongjune89c2092008-12-25 16:54:58 -08005246 params.assoc_id = 0;
5247 } else if (len >= sizeof(struct sctp_assoc_value)) {
5248 len = sizeof(struct sctp_assoc_value);
5249 if (copy_from_user(&params, optval, sizeof(params)))
5250 return -EFAULT;
5251 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07005252 return -EINVAL;
5253
Wei Yongjune89c2092008-12-25 16:54:58 -08005254 asoc = sctp_id2assoc(sk, params.assoc_id);
5255 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5256 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005257
Wei Yongjune89c2092008-12-25 16:54:58 -08005258 if (asoc)
5259 params.assoc_value = asoc->frag_point;
5260 else
5261 params.assoc_value = sctp_sk(sk)->user_frag;
5262
Linus Torvalds1da177e2005-04-16 15:20:36 -07005263 if (put_user(len, optlen))
5264 return -EFAULT;
Wei Yongjune89c2092008-12-25 16:54:58 -08005265 if (len == sizeof(int)) {
5266 if (copy_to_user(optval, &params.assoc_value, len))
5267 return -EFAULT;
5268 } else {
5269 if (copy_to_user(optval, &params, len))
5270 return -EFAULT;
5271 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005272
5273 return 0;
5274}
5275
Vlad Yasevichb6e13312007-04-20 12:23:15 -07005276/*
5277 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5278 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5279 */
5280static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5281 char __user *optval, int __user *optlen)
5282{
5283 int val;
5284
5285 if (len < sizeof(int))
5286 return -EINVAL;
5287
5288 len = sizeof(int);
5289
5290 val = sctp_sk(sk)->frag_interleave;
5291 if (put_user(len, optlen))
5292 return -EFAULT;
5293 if (copy_to_user(optval, &val, len))
5294 return -EFAULT;
5295
5296 return 0;
5297}
5298
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005299/*
5300 * 7.1.25. Set or Get the sctp partial delivery point
5301 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5302 */
5303static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5304 char __user *optval,
5305 int __user *optlen)
5306{
YOSHIFUJI Hideaki9cbcbf42007-07-19 10:44:50 +09005307 u32 val;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005308
5309 if (len < sizeof(u32))
5310 return -EINVAL;
5311
5312 len = sizeof(u32);
5313
5314 val = sctp_sk(sk)->pd_point;
5315 if (put_user(len, optlen))
5316 return -EFAULT;
5317 if (copy_to_user(optval, &val, len))
5318 return -EFAULT;
5319
Wei Yongjun7d743b72010-12-14 16:10:41 +00005320 return 0;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005321}
5322
Vlad Yasevich70331572007-03-23 11:34:36 -07005323/*
5324 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5325 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5326 */
5327static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5328 char __user *optval,
5329 int __user *optlen)
5330{
Neil Horman219b99a2008-03-05 13:44:46 -08005331 struct sctp_assoc_value params;
5332 struct sctp_sock *sp;
5333 struct sctp_association *asoc;
Vlad Yasevich70331572007-03-23 11:34:36 -07005334
Neil Horman219b99a2008-03-05 13:44:46 -08005335 if (len == sizeof(int)) {
Joe Perches145ce502010-08-24 13:21:08 +00005336 pr_warn("Use of int in max_burst socket option deprecated\n");
5337 pr_warn("Use struct sctp_assoc_value instead\n");
Neil Horman219b99a2008-03-05 13:44:46 -08005338 params.assoc_id = 0;
Wei Yongjunc6db93a2009-03-02 09:46:12 +00005339 } else if (len >= sizeof(struct sctp_assoc_value)) {
5340 len = sizeof(struct sctp_assoc_value);
Neil Horman219b99a2008-03-05 13:44:46 -08005341 if (copy_from_user(&params, optval, len))
5342 return -EFAULT;
5343 } else
5344 return -EINVAL;
Vlad Yasevich70331572007-03-23 11:34:36 -07005345
Neil Horman219b99a2008-03-05 13:44:46 -08005346 sp = sctp_sk(sk);
Vlad Yasevich70331572007-03-23 11:34:36 -07005347
Neil Horman219b99a2008-03-05 13:44:46 -08005348 if (params.assoc_id != 0) {
5349 asoc = sctp_id2assoc(sk, params.assoc_id);
5350 if (!asoc)
5351 return -EINVAL;
5352 params.assoc_value = asoc->max_burst;
5353 } else
5354 params.assoc_value = sp->max_burst;
5355
5356 if (len == sizeof(int)) {
5357 if (copy_to_user(optval, &params.assoc_value, len))
5358 return -EFAULT;
5359 } else {
5360 if (copy_to_user(optval, &params, len))
5361 return -EFAULT;
5362 }
5363
5364 return 0;
5365
Vlad Yasevich70331572007-03-23 11:34:36 -07005366}
5367
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005368static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5369 char __user *optval, int __user *optlen)
5370{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005371 struct net *net = sock_net(sk);
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005372 struct sctp_hmacalgo __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005373 struct sctp_hmac_algo_param *hmacs;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005374 __u16 data_len = 0;
5375 u32 num_idents;
5376
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005377 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005378 return -EACCES;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005379
5380 hmacs = sctp_sk(sk)->ep->auth_hmacs_list;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005381 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005382
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005383 if (len < sizeof(struct sctp_hmacalgo) + data_len)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005384 return -EINVAL;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005385
5386 len = sizeof(struct sctp_hmacalgo) + data_len;
5387 num_idents = data_len / sizeof(u16);
5388
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005389 if (put_user(len, optlen))
5390 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005391 if (put_user(num_idents, &p->shmac_num_idents))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005392 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005393 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5394 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005395 return 0;
5396}
5397
5398static int sctp_getsockopt_active_key(struct sock *sk, int len,
5399 char __user *optval, int __user *optlen)
5400{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005401 struct net *net = sock_net(sk);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005402 struct sctp_authkeyid val;
5403 struct sctp_association *asoc;
5404
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005405 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005406 return -EACCES;
5407
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005408 if (len < sizeof(struct sctp_authkeyid))
5409 return -EINVAL;
5410 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5411 return -EFAULT;
5412
5413 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5414 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5415 return -EINVAL;
5416
5417 if (asoc)
5418 val.scact_keynumber = asoc->active_key_id;
5419 else
5420 val.scact_keynumber = sctp_sk(sk)->ep->active_key_id;
5421
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005422 len = sizeof(struct sctp_authkeyid);
5423 if (put_user(len, optlen))
5424 return -EFAULT;
5425 if (copy_to_user(optval, &val, len))
5426 return -EFAULT;
5427
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005428 return 0;
5429}
5430
5431static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5432 char __user *optval, int __user *optlen)
5433{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005434 struct net *net = sock_net(sk);
Al Viro411223c2007-10-14 19:21:20 +01005435 struct sctp_authchunks __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005436 struct sctp_authchunks val;
5437 struct sctp_association *asoc;
5438 struct sctp_chunks_param *ch;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005439 u32 num_chunks = 0;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005440 char __user *to;
5441
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005442 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005443 return -EACCES;
5444
5445 if (len < sizeof(struct sctp_authchunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005446 return -EINVAL;
5447
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005448 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005449 return -EFAULT;
5450
Al Viro411223c2007-10-14 19:21:20 +01005451 to = p->gauth_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005452 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5453 if (!asoc)
5454 return -EINVAL;
5455
5456 ch = asoc->peer.peer_chunks;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005457 if (!ch)
5458 goto num;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005459
5460 /* See if the user provided enough room for all the data */
Vlad Yasevichb40db682008-02-27 14:40:37 -05005461 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5462 if (len < num_chunks)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005463 return -EINVAL;
5464
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005465 if (copy_to_user(to, ch->chunks, num_chunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005466 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005467num:
5468 len = sizeof(struct sctp_authchunks) + num_chunks;
5469 if (put_user(len, optlen)) return -EFAULT;
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05005470 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5471 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005472 return 0;
5473}
5474
5475static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5476 char __user *optval, int __user *optlen)
5477{
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005478 struct net *net = sock_net(sk);
Al Viro411223c2007-10-14 19:21:20 +01005479 struct sctp_authchunks __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005480 struct sctp_authchunks val;
5481 struct sctp_association *asoc;
5482 struct sctp_chunks_param *ch;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005483 u32 num_chunks = 0;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005484 char __user *to;
5485
Eric W. Biedermane1fc3b12012-08-07 07:29:57 +00005486 if (!net->sctp.auth_enable)
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005487 return -EACCES;
5488
5489 if (len < sizeof(struct sctp_authchunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005490 return -EINVAL;
5491
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005492 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005493 return -EFAULT;
5494
Al Viro411223c2007-10-14 19:21:20 +01005495 to = p->gauth_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005496 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5497 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5498 return -EINVAL;
5499
5500 if (asoc)
5501 ch = (struct sctp_chunks_param*)asoc->c.auth_chunks;
5502 else
5503 ch = sctp_sk(sk)->ep->auth_chunk_list;
5504
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005505 if (!ch)
5506 goto num;
5507
Vlad Yasevichb40db682008-02-27 14:40:37 -05005508 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005509 if (len < sizeof(struct sctp_authchunks) + num_chunks)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005510 return -EINVAL;
5511
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005512 if (copy_to_user(to, ch->chunks, num_chunks))
5513 return -EFAULT;
5514num:
5515 len = sizeof(struct sctp_authchunks) + num_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005516 if (put_user(len, optlen))
5517 return -EFAULT;
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05005518 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5519 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005520
5521 return 0;
5522}
5523
Wei Yongjunaea3c5c2008-12-25 16:57:24 -08005524/*
5525 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5526 * This option gets the current number of associations that are attached
5527 * to a one-to-many style socket. The option value is an uint32_t.
5528 */
5529static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5530 char __user *optval, int __user *optlen)
5531{
5532 struct sctp_sock *sp = sctp_sk(sk);
5533 struct sctp_association *asoc;
5534 u32 val = 0;
5535
5536 if (sctp_style(sk, TCP))
5537 return -EOPNOTSUPP;
5538
5539 if (len < sizeof(u32))
5540 return -EINVAL;
5541
5542 len = sizeof(u32);
5543
5544 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5545 val++;
5546 }
5547
5548 if (put_user(len, optlen))
5549 return -EFAULT;
5550 if (copy_to_user(optval, &val, len))
5551 return -EFAULT;
5552
5553 return 0;
5554}
5555
Wei Yongjun209ba422011-04-17 17:27:08 +00005556/*
Michio Honda7dc04d72011-04-26 20:16:31 +09005557 * 8.1.23 SCTP_AUTO_ASCONF
5558 * See the corresponding setsockopt entry as description
5559 */
5560static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5561 char __user *optval, int __user *optlen)
5562{
5563 int val = 0;
5564
5565 if (len < sizeof(int))
5566 return -EINVAL;
5567
5568 len = sizeof(int);
5569 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5570 val = 1;
5571 if (put_user(len, optlen))
5572 return -EFAULT;
5573 if (copy_to_user(optval, &val, len))
5574 return -EFAULT;
5575 return 0;
5576}
5577
5578/*
Wei Yongjun209ba422011-04-17 17:27:08 +00005579 * 8.2.6. Get the Current Identifiers of Associations
5580 * (SCTP_GET_ASSOC_ID_LIST)
5581 *
5582 * This option gets the current list of SCTP association identifiers of
5583 * the SCTP associations handled by a one-to-many style socket.
5584 */
5585static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5586 char __user *optval, int __user *optlen)
5587{
5588 struct sctp_sock *sp = sctp_sk(sk);
5589 struct sctp_association *asoc;
5590 struct sctp_assoc_ids *ids;
5591 u32 num = 0;
5592
5593 if (sctp_style(sk, TCP))
5594 return -EOPNOTSUPP;
5595
5596 if (len < sizeof(struct sctp_assoc_ids))
5597 return -EINVAL;
5598
5599 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5600 num++;
5601 }
5602
5603 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5604 return -EINVAL;
5605
5606 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5607
5608 ids = kmalloc(len, GFP_KERNEL);
5609 if (unlikely(!ids))
5610 return -ENOMEM;
5611
5612 ids->gaids_number_of_ids = num;
5613 num = 0;
5614 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5615 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5616 }
5617
5618 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5619 kfree(ids);
5620 return -EFAULT;
5621 }
5622
5623 kfree(ids);
5624 return 0;
5625}
5626
Neil Horman5aa93bc2012-07-21 07:56:07 +00005627/*
5628 * SCTP_PEER_ADDR_THLDS
5629 *
5630 * This option allows us to fetch the partially failed threshold for one or all
5631 * transports in an association. See Section 6.1 of:
5632 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5633 */
5634static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
5635 char __user *optval,
5636 int len,
5637 int __user *optlen)
5638{
5639 struct sctp_paddrthlds val;
5640 struct sctp_transport *trans;
5641 struct sctp_association *asoc;
5642
5643 if (len < sizeof(struct sctp_paddrthlds))
5644 return -EINVAL;
5645 len = sizeof(struct sctp_paddrthlds);
5646 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
5647 return -EFAULT;
5648
5649 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
5650 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
5651 if (!asoc)
5652 return -ENOENT;
5653
5654 val.spt_pathpfthld = asoc->pf_retrans;
5655 val.spt_pathmaxrxt = asoc->pathmaxrxt;
5656 } else {
5657 trans = sctp_addr_id2transport(sk, &val.spt_address,
5658 val.spt_assoc_id);
5659 if (!trans)
5660 return -ENOENT;
5661
5662 val.spt_pathmaxrxt = trans->pathmaxrxt;
5663 val.spt_pathpfthld = trans->pf_retrans;
5664 }
5665
5666 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
5667 return -EFAULT;
5668
5669 return 0;
5670}
5671
Michele Baldessari196d6752012-12-01 04:49:42 +00005672/*
5673 * SCTP_GET_ASSOC_STATS
5674 *
5675 * This option retrieves local per endpoint statistics. It is modeled
5676 * after OpenSolaris' implementation
5677 */
5678static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
5679 char __user *optval,
5680 int __user *optlen)
5681{
5682 struct sctp_assoc_stats sas;
5683 struct sctp_association *asoc = NULL;
5684
5685 /* User must provide at least the assoc id */
5686 if (len < sizeof(sctp_assoc_t))
5687 return -EINVAL;
5688
Guenter Roeck726bc6b2013-02-27 10:57:31 +00005689 /* Allow the struct to grow and fill in as much as possible */
5690 len = min_t(size_t, len, sizeof(sas));
5691
Michele Baldessari196d6752012-12-01 04:49:42 +00005692 if (copy_from_user(&sas, optval, len))
5693 return -EFAULT;
5694
5695 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
5696 if (!asoc)
5697 return -EINVAL;
5698
5699 sas.sas_rtxchunks = asoc->stats.rtxchunks;
5700 sas.sas_gapcnt = asoc->stats.gapcnt;
5701 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
5702 sas.sas_osacks = asoc->stats.osacks;
5703 sas.sas_isacks = asoc->stats.isacks;
5704 sas.sas_octrlchunks = asoc->stats.octrlchunks;
5705 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
5706 sas.sas_oodchunks = asoc->stats.oodchunks;
5707 sas.sas_iodchunks = asoc->stats.iodchunks;
5708 sas.sas_ouodchunks = asoc->stats.ouodchunks;
5709 sas.sas_iuodchunks = asoc->stats.iuodchunks;
5710 sas.sas_idupchunks = asoc->stats.idupchunks;
5711 sas.sas_opackets = asoc->stats.opackets;
5712 sas.sas_ipackets = asoc->stats.ipackets;
5713
5714 /* New high max rto observed, will return 0 if not a single
5715 * RTO update took place. obs_rto_ipaddr will be bogus
5716 * in such a case
5717 */
5718 sas.sas_maxrto = asoc->stats.max_obs_rto;
5719 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
5720 sizeof(struct sockaddr_storage));
5721
5722 /* Mark beginning of a new observation period */
5723 asoc->stats.max_obs_rto = asoc->rto_min;
5724
Michele Baldessari196d6752012-12-01 04:49:42 +00005725 if (put_user(len, optlen))
5726 return -EFAULT;
5727
5728 SCTP_DEBUG_PRINTK("sctp_getsockopt_assoc_stat(%d): %d\n",
5729 len, sas.sas_assoc_id);
5730
5731 if (copy_to_user(optval, &sas, len))
5732 return -EFAULT;
5733
5734 return 0;
5735}
5736
Linus Torvalds1da177e2005-04-16 15:20:36 -07005737SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
5738 char __user *optval, int __user *optlen)
5739{
5740 int retval = 0;
5741 int len;
5742
Frank Filz3f7a87d2005-06-20 13:14:57 -07005743 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5744 sk, optname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005745
5746 /* I can hardly begin to describe how wrong this is. This is
5747 * so broken as to be worse than useless. The API draft
5748 * REALLY is NOT helpful here... I am not convinced that the
5749 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5750 * are at all well-founded.
5751 */
5752 if (level != SOL_SCTP) {
5753 struct sctp_af *af = sctp_sk(sk)->pf->af;
5754
5755 retval = af->getsockopt(sk, level, optname, optval, optlen);
5756 return retval;
5757 }
5758
5759 if (get_user(len, optlen))
5760 return -EFAULT;
5761
5762 sctp_lock_sock(sk);
5763
5764 switch (optname) {
5765 case SCTP_STATUS:
5766 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5767 break;
5768 case SCTP_DISABLE_FRAGMENTS:
5769 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5770 optlen);
5771 break;
5772 case SCTP_EVENTS:
5773 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5774 break;
5775 case SCTP_AUTOCLOSE:
5776 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5777 break;
5778 case SCTP_SOCKOPT_PEELOFF:
5779 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5780 break;
5781 case SCTP_PEER_ADDR_PARAMS:
5782 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5783 optlen);
5784 break;
Shan Wei4580ccc2011-01-18 22:39:00 +00005785 case SCTP_DELAYED_SACK:
Wei Yongjund364d922008-05-09 15:13:26 -07005786 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
Frank Filz77086102005-12-22 11:37:30 -08005787 optlen);
5788 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005789 case SCTP_INITMSG:
5790 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
5791 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005792 case SCTP_GET_PEER_ADDRS:
5793 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
5794 optlen);
5795 break;
5796 case SCTP_GET_LOCAL_ADDRS:
5797 retval = sctp_getsockopt_local_addrs(sk, len, optval,
5798 optlen);
5799 break;
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04005800 case SCTP_SOCKOPT_CONNECTX3:
5801 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
5802 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005803 case SCTP_DEFAULT_SEND_PARAM:
5804 retval = sctp_getsockopt_default_send_param(sk, len,
5805 optval, optlen);
5806 break;
5807 case SCTP_PRIMARY_ADDR:
5808 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
5809 break;
5810 case SCTP_NODELAY:
5811 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
5812 break;
5813 case SCTP_RTOINFO:
5814 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
5815 break;
5816 case SCTP_ASSOCINFO:
5817 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
5818 break;
5819 case SCTP_I_WANT_MAPPED_V4_ADDR:
5820 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
5821 break;
5822 case SCTP_MAXSEG:
5823 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
5824 break;
5825 case SCTP_GET_PEER_ADDR_INFO:
5826 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
5827 optlen);
5828 break;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08005829 case SCTP_ADAPTATION_LAYER:
5830 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005831 optlen);
5832 break;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005833 case SCTP_CONTEXT:
5834 retval = sctp_getsockopt_context(sk, len, optval, optlen);
5835 break;
Vlad Yasevichb6e13312007-04-20 12:23:15 -07005836 case SCTP_FRAGMENT_INTERLEAVE:
5837 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
5838 optlen);
5839 break;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005840 case SCTP_PARTIAL_DELIVERY_POINT:
5841 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
5842 optlen);
5843 break;
Vlad Yasevich70331572007-03-23 11:34:36 -07005844 case SCTP_MAX_BURST:
5845 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
5846 break;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005847 case SCTP_AUTH_KEY:
5848 case SCTP_AUTH_CHUNK:
5849 case SCTP_AUTH_DELETE_KEY:
5850 retval = -EOPNOTSUPP;
5851 break;
5852 case SCTP_HMAC_IDENT:
5853 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
5854 break;
5855 case SCTP_AUTH_ACTIVE_KEY:
5856 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
5857 break;
5858 case SCTP_PEER_AUTH_CHUNKS:
5859 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
5860 optlen);
5861 break;
5862 case SCTP_LOCAL_AUTH_CHUNKS:
5863 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
5864 optlen);
5865 break;
Wei Yongjunaea3c5c2008-12-25 16:57:24 -08005866 case SCTP_GET_ASSOC_NUMBER:
5867 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
5868 break;
Wei Yongjun209ba422011-04-17 17:27:08 +00005869 case SCTP_GET_ASSOC_ID_LIST:
5870 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
5871 break;
Michio Honda7dc04d72011-04-26 20:16:31 +09005872 case SCTP_AUTO_ASCONF:
5873 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
5874 break;
Neil Horman5aa93bc2012-07-21 07:56:07 +00005875 case SCTP_PEER_ADDR_THLDS:
5876 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
5877 break;
Michele Baldessari196d6752012-12-01 04:49:42 +00005878 case SCTP_GET_ASSOC_STATS:
5879 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
5880 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005881 default:
5882 retval = -ENOPROTOOPT;
5883 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07005884 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005885
5886 sctp_release_sock(sk);
5887 return retval;
5888}
5889
5890static void sctp_hash(struct sock *sk)
5891{
5892 /* STUB */
5893}
5894
5895static void sctp_unhash(struct sock *sk)
5896{
5897 /* STUB */
5898}
5899
5900/* Check if port is acceptable. Possibly find first available port.
5901 *
5902 * The port hash table (contained in the 'global' SCTP protocol storage
5903 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5904 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5905 * list (the list number is the port number hashed out, so as you
5906 * would expect from a hash function, all the ports in a given list have
5907 * such a number that hashes out to the same list number; you were
5908 * expecting that, right?); so each list has a set of ports, with a
5909 * link to the socket (struct sock) that uses it, the port number and
5910 * a fastreuse flag (FIXME: NPI ipg).
5911 */
5912static struct sctp_bind_bucket *sctp_bucket_create(
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005913 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005914
5915static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
5916{
5917 struct sctp_bind_hashbucket *head; /* hash list */
Sasha Levinb67bfe02013-02-27 17:06:00 -08005918 struct sctp_bind_bucket *pp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005919 unsigned short snum;
5920 int ret;
5921
Al Viro04afd8b2006-11-20 17:02:01 -08005922 snum = ntohs(addr->v4.sin_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005923
5924 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
5925 sctp_local_bh_disable();
5926
5927 if (snum == 0) {
Stephen Hemminger06393002007-10-10 17:30:18 -07005928 /* Search for an available port. */
Stephen Hemminger227b60f2007-10-10 17:30:46 -07005929 int low, high, remaining, index;
5930 unsigned int rover;
5931
5932 inet_get_local_port_range(&low, &high);
5933 remaining = (high - low) + 1;
5934 rover = net_random() % remaining + low;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005935
Linus Torvalds1da177e2005-04-16 15:20:36 -07005936 do {
5937 rover++;
5938 if ((rover < low) || (rover > high))
5939 rover = low;
Amerigo Wange3826f12010-05-05 00:27:06 +00005940 if (inet_is_reserved_local_port(rover))
5941 continue;
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005942 index = sctp_phashfn(sock_net(sk), rover);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005943 head = &sctp_port_hashtable[index];
5944 sctp_spin_lock(&head->lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08005945 sctp_for_each_hentry(pp, &head->chain)
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005946 if ((pp->port == rover) &&
5947 net_eq(sock_net(sk), pp->net))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005948 goto next;
5949 break;
5950 next:
5951 sctp_spin_unlock(&head->lock);
5952 } while (--remaining > 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005953
5954 /* Exhausted local port range during search? */
5955 ret = 1;
5956 if (remaining <= 0)
5957 goto fail;
5958
5959 /* OK, here is the one we will use. HEAD (the port
5960 * hash table list entry) is non-NULL and we hold it's
5961 * mutex.
5962 */
5963 snum = rover;
5964 } else {
5965 /* We are given an specific port number; we verify
5966 * that it is not being used. If it is used, we will
5967 * exahust the search in the hash list corresponding
5968 * to the port number (snum) - we detect that with the
5969 * port iterator, pp being NULL.
5970 */
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005971 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07005972 sctp_spin_lock(&head->lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08005973 sctp_for_each_hentry(pp, &head->chain) {
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00005974 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005975 goto pp_found;
5976 }
5977 }
5978 pp = NULL;
5979 goto pp_not_found;
5980pp_found:
5981 if (!hlist_empty(&pp->owner)) {
5982 /* We had a port hash table hit - there is an
5983 * available port (pp != NULL) and it is being
5984 * used by other socket (pp->owner not empty); that other
5985 * socket is going to be sk2.
5986 */
5987 int reuse = sk->sk_reuse;
5988 struct sock *sk2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005989
5990 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
Vlad Yasevichce5325c2007-05-04 13:34:49 -07005991 if (pp->fastreuse && sk->sk_reuse &&
5992 sk->sk_state != SCTP_SS_LISTENING)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005993 goto success;
5994
5995 /* Run through the list of sockets bound to the port
5996 * (pp->port) [via the pointers bind_next and
5997 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5998 * we get the endpoint they describe and run through
5999 * the endpoint's list of IP (v4 or v6) addresses,
6000 * comparing each of the addresses with the address of
6001 * the socket sk. If we find a match, then that means
6002 * that this port/socket (sk) combination are already
6003 * in an endpoint.
6004 */
Sasha Levinb67bfe02013-02-27 17:06:00 -08006005 sk_for_each_bound(sk2, &pp->owner) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006006 struct sctp_endpoint *ep2;
6007 ep2 = sctp_sk(sk2)->ep;
6008
Vlad Yasevich4e540642008-07-18 23:06:32 -07006009 if (sk == sk2 ||
6010 (reuse && sk2->sk_reuse &&
6011 sk2->sk_state != SCTP_SS_LISTENING))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006012 continue;
6013
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07006014 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
6015 sctp_sk(sk2), sctp_sk(sk))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006016 ret = (long)sk2;
6017 goto fail_unlock;
6018 }
6019 }
6020 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
6021 }
6022pp_not_found:
6023 /* If there was a hash table miss, create a new port. */
6024 ret = 1;
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006025 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006026 goto fail_unlock;
6027
6028 /* In either case (hit or miss), make sure fastreuse is 1 only
6029 * if sk->sk_reuse is too (that is, if the caller requested
6030 * SO_REUSEADDR on this socket -sk-).
6031 */
Vlad Yasevichce5325c2007-05-04 13:34:49 -07006032 if (hlist_empty(&pp->owner)) {
6033 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
6034 pp->fastreuse = 1;
6035 else
6036 pp->fastreuse = 0;
6037 } else if (pp->fastreuse &&
6038 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006039 pp->fastreuse = 0;
6040
6041 /* We are set, so fill up all the data in the hash table
6042 * entry, tie the socket list information with the rest of the
6043 * sockets FIXME: Blurry, NPI (ipg).
6044 */
6045success:
Linus Torvalds1da177e2005-04-16 15:20:36 -07006046 if (!sctp_sk(sk)->bind_hash) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006047 inet_sk(sk)->inet_num = snum;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006048 sk_add_bind_node(sk, &pp->owner);
6049 sctp_sk(sk)->bind_hash = pp;
6050 }
6051 ret = 0;
6052
6053fail_unlock:
6054 sctp_spin_unlock(&head->lock);
6055
6056fail:
6057 sctp_local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006058 return ret;
6059}
6060
6061/* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6062 * port is requested.
6063 */
6064static int sctp_get_port(struct sock *sk, unsigned short snum)
6065{
6066 long ret;
6067 union sctp_addr addr;
6068 struct sctp_af *af = sctp_sk(sk)->pf->af;
6069
6070 /* Set up a dummy address struct from the sk. */
6071 af->from_sk(&addr, sk);
6072 addr.v4.sin_port = htons(snum);
6073
6074 /* Note: sk->sk_num gets filled in if ephemeral port request. */
6075 ret = sctp_get_port_local(sk, &addr);
6076
Eric Dumazeta02cec22010-09-22 20:43:57 +00006077 return ret ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006078}
6079
6080/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07006081 * Move a socket to LISTENING state.
6082 */
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006083SCTP_STATIC int sctp_listen_start(struct sock *sk, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006084{
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006085 struct sctp_sock *sp = sctp_sk(sk);
6086 struct sctp_endpoint *ep = sp->ep;
Herbert Xu1b489e12006-08-20 15:07:14 +10006087 struct crypto_hash *tfm = NULL;
Neil Horman3c681982012-10-24 09:20:03 +00006088 char alg[32];
Linus Torvalds1da177e2005-04-16 15:20:36 -07006089
6090 /* Allocate HMAC for generating cookie. */
Neil Horman3c681982012-10-24 09:20:03 +00006091 if (!sp->hmac && sp->sctp_hmac_alg) {
6092 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
6093 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
Vlad Yasevich8dc49842007-05-09 13:50:20 -07006094 if (IS_ERR(tfm)) {
Joe Perchese87cc472012-05-13 21:56:26 +00006095 net_info_ratelimited("failed to load transform for %s: %ld\n",
Neil Horman3c681982012-10-24 09:20:03 +00006096 sp->sctp_hmac_alg, PTR_ERR(tfm));
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006097 return -ENOSYS;
6098 }
6099 sctp_sk(sk)->hmac = tfm;
6100 }
6101
6102 /*
6103 * If a bind() or sctp_bindx() is not called prior to a listen()
6104 * call that allows new associations to be accepted, the system
6105 * picks an ephemeral port and will choose an address set equivalent
6106 * to binding with a wildcard address.
6107 *
6108 * This is not currently spelled out in the SCTP sockets
6109 * extensions draft, but follows the practice as seen in TCP
6110 * sockets.
6111 *
6112 */
6113 sk->sk_state = SCTP_SS_LISTENING;
6114 if (!ep->base.bind_addr.port) {
6115 if (sctp_autobind(sk))
6116 return -EAGAIN;
6117 } else {
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006118 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006119 sk->sk_state = SCTP_SS_CLOSED;
6120 return -EADDRINUSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006121 }
6122 }
6123
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006124 sk->sk_max_ack_backlog = backlog;
6125 sctp_hash_endpoint(ep);
6126 return 0;
6127}
6128
6129/*
6130 * 4.1.3 / 5.1.3 listen()
6131 *
6132 * By default, new associations are not accepted for UDP style sockets.
6133 * An application uses listen() to mark a socket as being able to
6134 * accept new associations.
6135 *
6136 * On TCP style sockets, applications use listen() to ready the SCTP
6137 * endpoint for accepting inbound associations.
6138 *
6139 * On both types of endpoints a backlog of '0' disables listening.
6140 *
6141 * Move a socket to LISTENING state.
6142 */
6143int sctp_inet_listen(struct socket *sock, int backlog)
6144{
6145 struct sock *sk = sock->sk;
6146 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6147 int err = -EINVAL;
6148
6149 if (unlikely(backlog < 0))
6150 return err;
6151
6152 sctp_lock_sock(sk);
6153
6154 /* Peeled-off sockets are not allowed to listen(). */
6155 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
6156 goto out;
6157
6158 if (sock->state != SS_UNCONNECTED)
6159 goto out;
6160
6161 /* If backlog is zero, disable listening. */
6162 if (!backlog) {
6163 if (sctp_sstate(sk, CLOSED))
6164 goto out;
6165
6166 err = 0;
6167 sctp_unhash_endpoint(ep);
6168 sk->sk_state = SCTP_SS_CLOSED;
6169 if (sk->sk_reuse)
6170 sctp_sk(sk)->bind_hash->fastreuse = 1;
6171 goto out;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07006172 }
6173
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006174 /* If we are already listening, just update the backlog */
6175 if (sctp_sstate(sk, LISTENING))
6176 sk->sk_max_ack_backlog = backlog;
6177 else {
6178 err = sctp_listen_start(sk, backlog);
6179 if (err)
6180 goto out;
6181 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006182
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00006183 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006184out:
6185 sctp_release_sock(sk);
6186 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006187}
6188
6189/*
6190 * This function is done by modeling the current datagram_poll() and the
6191 * tcp_poll(). Note that, based on these implementations, we don't
6192 * lock the socket in this function, even though it seems that,
6193 * ideally, locking or some other mechanisms can be used to ensure
Neil Horman9bffc4a2005-12-19 14:24:40 -08006194 * the integrity of the counters (sndbuf and wmem_alloc) used
Linus Torvalds1da177e2005-04-16 15:20:36 -07006195 * in this place. We assume that we don't need locks either until proven
6196 * otherwise.
6197 *
6198 * Another thing to note is that we include the Async I/O support
6199 * here, again, by modeling the current TCP/UDP code. We don't have
6200 * a good way to test with it yet.
6201 */
6202unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
6203{
6204 struct sock *sk = sock->sk;
6205 struct sctp_sock *sp = sctp_sk(sk);
6206 unsigned int mask;
6207
Eric Dumazetaa395142010-04-20 13:03:51 +00006208 poll_wait(file, sk_sleep(sk), wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006209
6210 /* A TCP-style listening socket becomes readable when the accept queue
6211 * is not empty.
6212 */
6213 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
6214 return (!list_empty(&sp->ep->asocs)) ?
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09006215 (POLLIN | POLLRDNORM) : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006216
6217 mask = 0;
6218
6219 /* Is there any exceptional events? */
6220 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
Keller, Jacob E7d4c04f2013-03-28 11:19:25 +00006221 mask |= POLLERR |
Daniel Borkmann8b1ada42013-09-07 16:44:59 +02006222 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
Davide Libenzif348d702006-03-25 03:07:39 -08006223 if (sk->sk_shutdown & RCV_SHUTDOWN)
Eric Dumazetdb409802010-09-06 11:13:50 +00006224 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006225 if (sk->sk_shutdown == SHUTDOWN_MASK)
6226 mask |= POLLHUP;
6227
6228 /* Is it readable? Reconsider this code with TCP-style support. */
Eric Dumazetdb409802010-09-06 11:13:50 +00006229 if (!skb_queue_empty(&sk->sk_receive_queue))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006230 mask |= POLLIN | POLLRDNORM;
6231
6232 /* The association is either gone or not ready. */
6233 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
6234 return mask;
6235
6236 /* Is it writable? */
6237 if (sctp_writeable(sk)) {
6238 mask |= POLLOUT | POLLWRNORM;
6239 } else {
6240 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
6241 /*
6242 * Since the socket is not locked, the buffer
6243 * might be made available after the writeable check and
6244 * before the bit is set. This could cause a lost I/O
6245 * signal. tcp_poll() has a race breaker for this race
6246 * condition. Based on their implementation, we put
6247 * in the following code to cover it as well.
6248 */
6249 if (sctp_writeable(sk))
6250 mask |= POLLOUT | POLLWRNORM;
6251 }
6252 return mask;
6253}
6254
6255/********************************************************************
6256 * 2nd Level Abstractions
6257 ********************************************************************/
6258
6259static struct sctp_bind_bucket *sctp_bucket_create(
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006260 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006261{
6262 struct sctp_bind_bucket *pp;
6263
Christoph Lameter54e6ecb2006-12-06 20:33:16 -08006264 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006265 if (pp) {
Li Zefan935a7f62008-04-10 01:58:06 -07006266 SCTP_DBG_OBJCNT_INC(bind_bucket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006267 pp->port = snum;
6268 pp->fastreuse = 0;
6269 INIT_HLIST_HEAD(&pp->owner);
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006270 pp->net = net;
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05006271 hlist_add_head(&pp->node, &head->chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006272 }
6273 return pp;
6274}
6275
6276/* Caller must hold hashbucket lock for this tb with local BH disabled */
6277static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6278{
Sridhar Samudrala37fa6872006-07-21 14:45:47 -07006279 if (pp && hlist_empty(&pp->owner)) {
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05006280 __hlist_del(&pp->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006281 kmem_cache_free(sctp_bucket_cachep, pp);
6282 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6283 }
6284}
6285
6286/* Release this socket's reference to a local port. */
6287static inline void __sctp_put_port(struct sock *sk)
6288{
6289 struct sctp_bind_hashbucket *head =
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006290 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
6291 inet_sk(sk)->inet_num)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07006292 struct sctp_bind_bucket *pp;
6293
6294 sctp_spin_lock(&head->lock);
6295 pp = sctp_sk(sk)->bind_hash;
6296 __sk_del_bind_node(sk);
6297 sctp_sk(sk)->bind_hash = NULL;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006298 inet_sk(sk)->inet_num = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006299 sctp_bucket_destroy(pp);
6300 sctp_spin_unlock(&head->lock);
6301}
6302
6303void sctp_put_port(struct sock *sk)
6304{
6305 sctp_local_bh_disable();
6306 __sctp_put_port(sk);
6307 sctp_local_bh_enable();
6308}
6309
6310/*
6311 * The system picks an ephemeral port and choose an address set equivalent
6312 * to binding with a wildcard address.
6313 * One of those addresses will be the primary address for the association.
6314 * This automatically enables the multihoming capability of SCTP.
6315 */
6316static int sctp_autobind(struct sock *sk)
6317{
6318 union sctp_addr autoaddr;
6319 struct sctp_af *af;
Al Viro6fbfa9f2006-11-20 17:24:53 -08006320 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006321
6322 /* Initialize a local sockaddr structure to INADDR_ANY. */
6323 af = sctp_sk(sk)->pf->af;
6324
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006325 port = htons(inet_sk(sk)->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006326 af->inaddr_any(&autoaddr, port);
6327
6328 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6329}
6330
6331/* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6332 *
6333 * From RFC 2292
6334 * 4.2 The cmsghdr Structure *
6335 *
6336 * When ancillary data is sent or received, any number of ancillary data
6337 * objects can be specified by the msg_control and msg_controllen members of
6338 * the msghdr structure, because each object is preceded by
6339 * a cmsghdr structure defining the object's length (the cmsg_len member).
6340 * Historically Berkeley-derived implementations have passed only one object
6341 * at a time, but this API allows multiple objects to be
6342 * passed in a single call to sendmsg() or recvmsg(). The following example
6343 * shows two ancillary data objects in a control buffer.
6344 *
6345 * |<--------------------------- msg_controllen -------------------------->|
6346 * | |
6347 *
6348 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6349 *
6350 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6351 * | | |
6352 *
6353 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6354 *
6355 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6356 * | | | | |
6357 *
6358 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6359 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6360 *
6361 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6362 *
6363 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6364 * ^
6365 * |
6366 *
6367 * msg_control
6368 * points here
6369 */
6370SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
6371 sctp_cmsgs_t *cmsgs)
6372{
6373 struct cmsghdr *cmsg;
Vlad Yasevichab38fb02008-04-12 18:40:06 -07006374 struct msghdr *my_msg = (struct msghdr *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006375
6376 for (cmsg = CMSG_FIRSTHDR(msg);
6377 cmsg != NULL;
Vlad Yasevichab38fb02008-04-12 18:40:06 -07006378 cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
6379 if (!CMSG_OK(my_msg, cmsg))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006380 return -EINVAL;
6381
6382 /* Should we parse this header or ignore? */
6383 if (cmsg->cmsg_level != IPPROTO_SCTP)
6384 continue;
6385
6386 /* Strictly check lengths following example in SCM code. */
6387 switch (cmsg->cmsg_type) {
6388 case SCTP_INIT:
6389 /* SCTP Socket API Extension
6390 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
6391 *
6392 * This cmsghdr structure provides information for
6393 * initializing new SCTP associations with sendmsg().
6394 * The SCTP_INITMSG socket option uses this same data
6395 * structure. This structure is not used for
6396 * recvmsg().
6397 *
6398 * cmsg_level cmsg_type cmsg_data[]
6399 * ------------ ------------ ----------------------
6400 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6401 */
6402 if (cmsg->cmsg_len !=
6403 CMSG_LEN(sizeof(struct sctp_initmsg)))
6404 return -EINVAL;
6405 cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
6406 break;
6407
6408 case SCTP_SNDRCV:
6409 /* SCTP Socket API Extension
6410 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6411 *
6412 * This cmsghdr structure specifies SCTP options for
6413 * sendmsg() and describes SCTP header information
6414 * about a received message through recvmsg().
6415 *
6416 * cmsg_level cmsg_type cmsg_data[]
6417 * ------------ ------------ ----------------------
6418 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6419 */
6420 if (cmsg->cmsg_len !=
6421 CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6422 return -EINVAL;
6423
6424 cmsgs->info =
6425 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
6426
6427 /* Minimally, validate the sinfo_flags. */
6428 if (cmsgs->info->sinfo_flags &
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07006429 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6430 SCTP_ABORT | SCTP_EOF))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006431 return -EINVAL;
6432 break;
6433
6434 default:
6435 return -EINVAL;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07006436 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006437 }
6438 return 0;
6439}
6440
6441/*
6442 * Wait for a packet..
6443 * Note: This function is the same function as in core/datagram.c
6444 * with a few modifications to make lksctp work.
6445 */
6446static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p)
6447{
6448 int error;
6449 DEFINE_WAIT(wait);
6450
Eric Dumazetaa395142010-04-20 13:03:51 +00006451 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006452
6453 /* Socket errors? */
6454 error = sock_error(sk);
6455 if (error)
6456 goto out;
6457
6458 if (!skb_queue_empty(&sk->sk_receive_queue))
6459 goto ready;
6460
6461 /* Socket shut down? */
6462 if (sk->sk_shutdown & RCV_SHUTDOWN)
6463 goto out;
6464
6465 /* Sequenced packets can come disconnected. If so we report the
6466 * problem.
6467 */
6468 error = -ENOTCONN;
6469
6470 /* Is there a good reason to think that we may receive some data? */
6471 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6472 goto out;
6473
6474 /* Handle signals. */
6475 if (signal_pending(current))
6476 goto interrupted;
6477
6478 /* Let another process have a go. Since we are going to sleep
6479 * anyway. Note: This may cause odd behaviors if the message
6480 * does not fit in the user's buffer, but this seems to be the
6481 * only way to honor MSG_DONTWAIT realistically.
6482 */
6483 sctp_release_sock(sk);
6484 *timeo_p = schedule_timeout(*timeo_p);
6485 sctp_lock_sock(sk);
6486
6487ready:
Eric Dumazetaa395142010-04-20 13:03:51 +00006488 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006489 return 0;
6490
6491interrupted:
6492 error = sock_intr_errno(*timeo_p);
6493
6494out:
Eric Dumazetaa395142010-04-20 13:03:51 +00006495 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006496 *err = error;
6497 return error;
6498}
6499
6500/* Receive a datagram.
6501 * Note: This is pretty much the same routine as in core/datagram.c
6502 * with a few changes to make lksctp work.
6503 */
6504static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6505 int noblock, int *err)
6506{
6507 int error;
6508 struct sk_buff *skb;
6509 long timeo;
6510
Linus Torvalds1da177e2005-04-16 15:20:36 -07006511 timeo = sock_rcvtimeo(sk, noblock);
6512
6513 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6514 timeo, MAX_SCHEDULE_TIMEOUT);
6515
6516 do {
6517 /* Again only user level code calls this function,
6518 * so nothing interrupt level
6519 * will suddenly eat the receive_queue.
6520 *
6521 * Look at current nfs client by the way...
David Shwatrz8917a3c2010-12-02 09:01:55 +00006522 * However, this function was correct in any case. 8)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006523 */
6524 if (flags & MSG_PEEK) {
Herbert Xu1e061ab2005-06-18 22:56:42 -07006525 spin_lock_bh(&sk->sk_receive_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006526 skb = skb_peek(&sk->sk_receive_queue);
6527 if (skb)
6528 atomic_inc(&skb->users);
Herbert Xu1e061ab2005-06-18 22:56:42 -07006529 spin_unlock_bh(&sk->sk_receive_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006530 } else {
6531 skb = skb_dequeue(&sk->sk_receive_queue);
6532 }
6533
6534 if (skb)
6535 return skb;
6536
Neil Horman6736dc32005-12-02 20:30:06 -08006537 /* Caller is allowed not to check sk->sk_err before calling. */
6538 error = sock_error(sk);
6539 if (error)
6540 goto no_packet;
6541
Linus Torvalds1da177e2005-04-16 15:20:36 -07006542 if (sk->sk_shutdown & RCV_SHUTDOWN)
6543 break;
6544
6545 /* User doesn't want to wait. */
6546 error = -EAGAIN;
6547 if (!timeo)
6548 goto no_packet;
6549 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6550
6551 return NULL;
6552
6553no_packet:
6554 *err = error;
6555 return NULL;
6556}
6557
6558/* If sndbuf has changed, wake up per association sndbuf waiters. */
6559static void __sctp_write_space(struct sctp_association *asoc)
6560{
6561 struct sock *sk = asoc->base.sk;
6562 struct socket *sock = sk->sk_socket;
6563
6564 if ((sctp_wspace(asoc) > 0) && sock) {
6565 if (waitqueue_active(&asoc->wait))
6566 wake_up_interruptible(&asoc->wait);
6567
6568 if (sctp_writeable(sk)) {
Eric Dumazeteaefd112011-02-18 03:26:36 +00006569 wait_queue_head_t *wq = sk_sleep(sk);
6570
6571 if (wq && waitqueue_active(wq))
6572 wake_up_interruptible(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006573
6574 /* Note that we try to include the Async I/O support
6575 * here by modeling from the current TCP/UDP code.
6576 * We have not tested with it yet.
6577 */
Eric Dumazeteaefd112011-02-18 03:26:36 +00006578 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08006579 sock_wake_async(sock,
6580 SOCK_WAKE_SPACE, POLL_OUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006581 }
6582 }
6583}
6584
Daniel Borkmann83bd9732014-04-08 17:26:13 +02006585static void sctp_wake_up_waiters(struct sock *sk,
6586 struct sctp_association *asoc)
6587{
6588 struct sctp_association *tmp = asoc;
6589
6590 /* We do accounting for the sndbuf space per association,
6591 * so we only need to wake our own association.
6592 */
6593 if (asoc->ep->sndbuf_policy)
6594 return __sctp_write_space(asoc);
6595
6596 /* Accounting for the sndbuf space is per socket, so we
6597 * need to wake up others, try to be fair and in case of
6598 * other associations, let them have a go first instead
6599 * of just doing a sctp_write_space() call.
6600 *
6601 * Note that we reach sctp_wake_up_waiters() only when
6602 * associations free up queued chunks, thus we are under
6603 * lock and the list of associations on a socket is
6604 * guaranteed not to change.
6605 */
6606 for (tmp = list_next_entry(tmp, asocs); 1;
6607 tmp = list_next_entry(tmp, asocs)) {
6608 /* Manually skip the head element. */
6609 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
6610 continue;
6611 /* Wake up association. */
6612 __sctp_write_space(tmp);
6613 /* We've reached the end. */
6614 if (tmp == asoc)
6615 break;
6616 }
6617}
6618
Linus Torvalds1da177e2005-04-16 15:20:36 -07006619/* Do accounting for the sndbuf space.
6620 * Decrement the used sndbuf space of the corresponding association by the
6621 * data size which was just transmitted(freed).
6622 */
6623static void sctp_wfree(struct sk_buff *skb)
6624{
6625 struct sctp_association *asoc;
6626 struct sctp_chunk *chunk;
6627 struct sock *sk;
6628
6629 /* Get the saved chunk pointer. */
6630 chunk = *((struct sctp_chunk **)(skb->cb));
6631 asoc = chunk->asoc;
6632 sk = asoc->base.sk;
Neil Horman4eb701d2005-04-28 12:02:04 -07006633 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6634 sizeof(struct sk_buff) +
6635 sizeof(struct sctp_chunk);
6636
Neil Horman4eb701d2005-04-28 12:02:04 -07006637 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6638
Neil Horman4d93df02007-08-15 16:07:44 -07006639 /*
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006640 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
Neil Horman4d93df02007-08-15 16:07:44 -07006641 */
6642 sk->sk_wmem_queued -= skb->truesize;
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006643 sk_mem_uncharge(sk, skb->truesize);
Neil Horman4d93df02007-08-15 16:07:44 -07006644
Neil Horman4eb701d2005-04-28 12:02:04 -07006645 sock_wfree(skb);
Daniel Borkmann83bd9732014-04-08 17:26:13 +02006646 sctp_wake_up_waiters(sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006647
6648 sctp_association_put(asoc);
6649}
6650
Vlad Yasevich331c4ee2006-10-09 21:34:04 -07006651/* Do accounting for the receive space on the socket.
6652 * Accounting for the association is done in ulpevent.c
6653 * We set this as a destructor for the cloned data skbs so that
6654 * accounting is done at the correct time.
6655 */
6656void sctp_sock_rfree(struct sk_buff *skb)
6657{
6658 struct sock *sk = skb->sk;
6659 struct sctp_ulpevent *event = sctp_skb2event(skb);
6660
6661 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
Neil Horman4d93df02007-08-15 16:07:44 -07006662
6663 /*
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006664 * Mimic the behavior of sock_rfree
Neil Horman4d93df02007-08-15 16:07:44 -07006665 */
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006666 sk_mem_uncharge(sk, event->rmem_len);
Vlad Yasevich331c4ee2006-10-09 21:34:04 -07006667}
6668
6669
Linus Torvalds1da177e2005-04-16 15:20:36 -07006670/* Helper function to wait for space in the sndbuf. */
6671static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6672 size_t msg_len)
6673{
6674 struct sock *sk = asoc->base.sk;
6675 int err = 0;
6676 long current_timeo = *timeo_p;
6677 DEFINE_WAIT(wait);
6678
6679 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09006680 asoc, (long)(*timeo_p), msg_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006681
6682 /* Increment the association's refcnt. */
6683 sctp_association_hold(asoc);
6684
6685 /* Wait on the association specific sndbuf space. */
6686 for (;;) {
6687 prepare_to_wait_exclusive(&asoc->wait, &wait,
6688 TASK_INTERRUPTIBLE);
6689 if (!*timeo_p)
6690 goto do_nonblock;
6691 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6692 asoc->base.dead)
6693 goto do_error;
6694 if (signal_pending(current))
6695 goto do_interrupted;
6696 if (msg_len <= sctp_wspace(asoc))
6697 break;
6698
6699 /* Let another process have a go. Since we are going
6700 * to sleep anyway.
6701 */
6702 sctp_release_sock(sk);
6703 current_timeo = schedule_timeout(current_timeo);
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07006704 BUG_ON(sk != asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006705 sctp_lock_sock(sk);
6706
6707 *timeo_p = current_timeo;
6708 }
6709
6710out:
6711 finish_wait(&asoc->wait, &wait);
6712
6713 /* Release the association's refcnt. */
6714 sctp_association_put(asoc);
6715
6716 return err;
6717
6718do_error:
6719 err = -EPIPE;
6720 goto out;
6721
6722do_interrupted:
6723 err = sock_intr_errno(*timeo_p);
6724 goto out;
6725
6726do_nonblock:
6727 err = -EAGAIN;
6728 goto out;
6729}
6730
Wei Yongjun561b1732010-04-28 08:47:18 +00006731void sctp_data_ready(struct sock *sk, int len)
6732{
David S. Miller7ef52732010-05-02 21:43:40 -07006733 struct socket_wq *wq;
6734
6735 rcu_read_lock();
6736 wq = rcu_dereference(sk->sk_wq);
6737 if (wq_has_sleeper(wq))
6738 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
Wei Yongjun561b1732010-04-28 08:47:18 +00006739 POLLRDNORM | POLLRDBAND);
6740 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
David S. Miller7ef52732010-05-02 21:43:40 -07006741 rcu_read_unlock();
Wei Yongjun561b1732010-04-28 08:47:18 +00006742}
6743
Linus Torvalds1da177e2005-04-16 15:20:36 -07006744/* If socket sndbuf has changed, wake up all per association waiters. */
6745void sctp_write_space(struct sock *sk)
6746{
6747 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006748
6749 /* Wake up the tasks in each wait queue. */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07006750 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006751 __sctp_write_space(asoc);
6752 }
6753}
6754
6755/* Is there any sndbuf space available on the socket?
6756 *
Neil Horman9bffc4a2005-12-19 14:24:40 -08006757 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07006758 * associations on the same socket. For a UDP-style socket with
6759 * multiple associations, it is possible for it to be "unwriteable"
6760 * prematurely. I assume that this is acceptable because
6761 * a premature "unwriteable" is better than an accidental "writeable" which
6762 * would cause an unwanted block under certain circumstances. For the 1-1
6763 * UDP-style sockets or TCP-style sockets, this code should work.
6764 * - Daisy
6765 */
6766static int sctp_writeable(struct sock *sk)
6767{
6768 int amt = 0;
6769
Eric Dumazet31e6d362009-06-17 19:05:41 -07006770 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006771 if (amt < 0)
6772 amt = 0;
6773 return amt;
6774}
6775
6776/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6777 * returns immediately with EINPROGRESS.
6778 */
6779static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
6780{
6781 struct sock *sk = asoc->base.sk;
6782 int err = 0;
6783 long current_timeo = *timeo_p;
6784 DEFINE_WAIT(wait);
6785
Harvey Harrison0dc47872008-03-05 20:47:47 -08006786 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__, asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -07006787 (long)(*timeo_p));
6788
6789 /* Increment the association's refcnt. */
6790 sctp_association_hold(asoc);
6791
6792 for (;;) {
6793 prepare_to_wait_exclusive(&asoc->wait, &wait,
6794 TASK_INTERRUPTIBLE);
6795 if (!*timeo_p)
6796 goto do_nonblock;
6797 if (sk->sk_shutdown & RCV_SHUTDOWN)
6798 break;
6799 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6800 asoc->base.dead)
6801 goto do_error;
6802 if (signal_pending(current))
6803 goto do_interrupted;
6804
6805 if (sctp_state(asoc, ESTABLISHED))
6806 break;
6807
6808 /* Let another process have a go. Since we are going
6809 * to sleep anyway.
6810 */
6811 sctp_release_sock(sk);
6812 current_timeo = schedule_timeout(current_timeo);
6813 sctp_lock_sock(sk);
6814
6815 *timeo_p = current_timeo;
6816 }
6817
6818out:
6819 finish_wait(&asoc->wait, &wait);
6820
6821 /* Release the association's refcnt. */
6822 sctp_association_put(asoc);
6823
6824 return err;
6825
6826do_error:
Vlad Yasevich81845c212006-01-30 15:59:54 -08006827 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006828 err = -ETIMEDOUT;
6829 else
6830 err = -ECONNREFUSED;
6831 goto out;
6832
6833do_interrupted:
6834 err = sock_intr_errno(*timeo_p);
6835 goto out;
6836
6837do_nonblock:
6838 err = -EINPROGRESS;
6839 goto out;
6840}
6841
6842static int sctp_wait_for_accept(struct sock *sk, long timeo)
6843{
6844 struct sctp_endpoint *ep;
6845 int err = 0;
6846 DEFINE_WAIT(wait);
6847
6848 ep = sctp_sk(sk)->ep;
6849
6850
6851 for (;;) {
Eric Dumazetaa395142010-04-20 13:03:51 +00006852 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
Linus Torvalds1da177e2005-04-16 15:20:36 -07006853 TASK_INTERRUPTIBLE);
6854
6855 if (list_empty(&ep->asocs)) {
6856 sctp_release_sock(sk);
6857 timeo = schedule_timeout(timeo);
6858 sctp_lock_sock(sk);
6859 }
6860
6861 err = -EINVAL;
6862 if (!sctp_sstate(sk, LISTENING))
6863 break;
6864
6865 err = 0;
6866 if (!list_empty(&ep->asocs))
6867 break;
6868
6869 err = sock_intr_errno(timeo);
6870 if (signal_pending(current))
6871 break;
6872
6873 err = -EAGAIN;
6874 if (!timeo)
6875 break;
6876 }
6877
Eric Dumazetaa395142010-04-20 13:03:51 +00006878 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006879
6880 return err;
6881}
6882
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +02006883static void sctp_wait_for_close(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006884{
6885 DEFINE_WAIT(wait);
6886
6887 do {
Eric Dumazetaa395142010-04-20 13:03:51 +00006888 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006889 if (list_empty(&sctp_sk(sk)->ep->asocs))
6890 break;
6891 sctp_release_sock(sk);
6892 timeout = schedule_timeout(timeout);
6893 sctp_lock_sock(sk);
6894 } while (!signal_pending(current) && timeout);
6895
Eric Dumazetaa395142010-04-20 13:03:51 +00006896 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006897}
6898
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006899static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
6900{
6901 struct sk_buff *frag;
6902
6903 if (!skb->data_len)
6904 goto done;
6905
6906 /* Don't forget the fragments. */
David S. Miller1b003be2009-06-09 00:22:35 -07006907 skb_walk_frags(skb, frag)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006908 sctp_skb_set_owner_r_frag(frag, sk);
6909
6910done:
6911 sctp_skb_set_owner_r(skb, sk);
6912}
6913
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006914void sctp_copy_sock(struct sock *newsk, struct sock *sk,
6915 struct sctp_association *asoc)
6916{
6917 struct inet_sock *inet = inet_sk(sk);
Julia Lawall09cb47a2010-01-21 02:43:20 -08006918 struct inet_sock *newinet;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006919
6920 newsk->sk_type = sk->sk_type;
6921 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
6922 newsk->sk_flags = sk->sk_flags;
6923 newsk->sk_no_check = sk->sk_no_check;
6924 newsk->sk_reuse = sk->sk_reuse;
6925
6926 newsk->sk_shutdown = sk->sk_shutdown;
6927 newsk->sk_destruct = inet_sock_destruct;
6928 newsk->sk_family = sk->sk_family;
6929 newsk->sk_protocol = IPPROTO_SCTP;
6930 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
6931 newsk->sk_sndbuf = sk->sk_sndbuf;
6932 newsk->sk_rcvbuf = sk->sk_rcvbuf;
6933 newsk->sk_lingertime = sk->sk_lingertime;
6934 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
6935 newsk->sk_sndtimeo = sk->sk_sndtimeo;
6936
6937 newinet = inet_sk(newsk);
6938
6939 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6940 * getsockname() and getpeername()
6941 */
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006942 newinet->inet_sport = inet->inet_sport;
6943 newinet->inet_saddr = inet->inet_saddr;
6944 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
6945 newinet->inet_dport = htons(asoc->peer.port);
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006946 newinet->pmtudisc = inet->pmtudisc;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006947 newinet->inet_id = asoc->next_tsn ^ jiffies;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006948
6949 newinet->uc_ttl = inet->uc_ttl;
6950 newinet->mc_loop = 1;
6951 newinet->mc_ttl = 1;
6952 newinet->mc_index = 0;
6953 newinet->mc_list = NULL;
6954}
6955
Linus Torvalds1da177e2005-04-16 15:20:36 -07006956/* Populate the fields of the newsk from the oldsk and migrate the assoc
6957 * and its messages to the newsk.
6958 */
6959static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
6960 struct sctp_association *assoc,
6961 sctp_socket_type_t type)
6962{
6963 struct sctp_sock *oldsp = sctp_sk(oldsk);
6964 struct sctp_sock *newsp = sctp_sk(newsk);
6965 struct sctp_bind_bucket *pp; /* hash list port iterator */
6966 struct sctp_endpoint *newep = newsp->ep;
6967 struct sk_buff *skb, *tmp;
6968 struct sctp_ulpevent *event;
Vlad Yasevichf26f7c42007-12-06 22:50:27 -08006969 struct sctp_bind_hashbucket *head;
Michio Honda9f7d6532011-04-26 19:32:51 +09006970 struct list_head tmplist;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006971
6972 /* Migrate socket buffer sizes and all the socket level options to the
6973 * new socket.
6974 */
6975 newsk->sk_sndbuf = oldsk->sk_sndbuf;
6976 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
6977 /* Brute force copy old sctp opt. */
Michio Honda9f7d6532011-04-26 19:32:51 +09006978 if (oldsp->do_auto_asconf) {
6979 memcpy(&tmplist, &newsp->auto_asconf_list, sizeof(tmplist));
6980 inet_sk_copy_descendant(newsk, oldsk);
6981 memcpy(&newsp->auto_asconf_list, &tmplist, sizeof(tmplist));
6982 } else
6983 inet_sk_copy_descendant(newsk, oldsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006984
6985 /* Restore the ep value that was overwritten with the above structure
6986 * copy.
6987 */
6988 newsp->ep = newep;
6989 newsp->hmac = NULL;
6990
6991 /* Hook this new socket in to the bind_hash list. */
Eric W. Biedermanf1f43762012-08-06 08:39:38 +00006992 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
6993 inet_sk(oldsk)->inet_num)];
Vlad Yasevichf26f7c42007-12-06 22:50:27 -08006994 sctp_local_bh_disable();
6995 sctp_spin_lock(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006996 pp = sctp_sk(oldsk)->bind_hash;
6997 sk_add_bind_node(newsk, &pp->owner);
6998 sctp_sk(newsk)->bind_hash = pp;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006999 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
Vlad Yasevichf26f7c42007-12-06 22:50:27 -08007000 sctp_spin_unlock(&head->lock);
7001 sctp_local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07007002
Vladislav Yasevich4243cac2005-06-13 15:10:49 -07007003 /* Copy the bind_addr list from the original endpoint to the new
7004 * endpoint so that we can handle restarts properly
7005 */
Vlad Yasevich8e71a112007-12-06 22:50:54 -08007006 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
7007 &oldsp->ep->base.bind_addr, GFP_KERNEL);
Vladislav Yasevich4243cac2005-06-13 15:10:49 -07007008
Linus Torvalds1da177e2005-04-16 15:20:36 -07007009 /* Move any messages in the old socket's receive queue that are for the
7010 * peeled off association to the new socket's receive queue.
7011 */
7012 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
7013 event = sctp_skb2event(skb);
7014 if (event->asoc == assoc) {
David S. Miller8728b832005-08-09 19:25:21 -07007015 __skb_unlink(skb, &oldsk->sk_receive_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007016 __skb_queue_tail(&newsk->sk_receive_queue, skb);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007017 sctp_skb_set_owner_r_frag(skb, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007018 }
7019 }
7020
7021 /* Clean up any messages pending delivery due to partial
7022 * delivery. Three cases:
7023 * 1) No partial deliver; no work.
7024 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
7025 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
7026 */
7027 skb_queue_head_init(&newsp->pd_lobby);
Vlad Yasevichb6e13312007-04-20 12:23:15 -07007028 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007029
Vlad Yasevichb6e13312007-04-20 12:23:15 -07007030 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07007031 struct sk_buff_head *queue;
7032
7033 /* Decide which queue to move pd_lobby skbs to. */
7034 if (assoc->ulpq.pd_mode) {
7035 queue = &newsp->pd_lobby;
7036 } else
7037 queue = &newsk->sk_receive_queue;
7038
7039 /* Walk through the pd_lobby, looking for skbs that
7040 * need moved to the new socket.
7041 */
7042 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
7043 event = sctp_skb2event(skb);
7044 if (event->asoc == assoc) {
David S. Miller8728b832005-08-09 19:25:21 -07007045 __skb_unlink(skb, &oldsp->pd_lobby);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007046 __skb_queue_tail(queue, skb);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007047 sctp_skb_set_owner_r_frag(skb, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007048 }
7049 }
7050
7051 /* Clear up any skbs waiting for the partial
7052 * delivery to finish.
7053 */
7054 if (assoc->ulpq.pd_mode)
Vlad Yasevichb6e13312007-04-20 12:23:15 -07007055 sctp_clear_pd(oldsk, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007056
7057 }
7058
Wei Yongjun1bc4ee42009-07-05 19:45:48 +00007059 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007060 sctp_skb_set_owner_r_frag(skb, newsk);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007061
Wei Yongjun1bc4ee42009-07-05 19:45:48 +00007062 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007063 sctp_skb_set_owner_r_frag(skb, newsk);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07007064
Linus Torvalds1da177e2005-04-16 15:20:36 -07007065 /* Set the type of socket to indicate that it is peeled off from the
7066 * original UDP-style socket or created with the accept() call on a
7067 * TCP-style socket..
7068 */
7069 newsp->type = type;
7070
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07007071 /* Mark the new socket "in-use" by the user so that any packets
7072 * that may arrive on the association after we've moved it are
7073 * queued to the backlog. This prevents a potential race between
7074 * backlog processing on the old socket and new-packet processing
7075 * on the new socket.
Zach Brown5131a182007-06-22 15:14:46 -07007076 *
7077 * The caller has just allocated newsk so we can guarantee that other
7078 * paths won't try to lock it and then oldsk.
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07007079 */
Zach Brown5131a182007-06-22 15:14:46 -07007080 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007081 sctp_assoc_migrate(assoc, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007082
7083 /* If the association on the newsk is already closed before accept()
7084 * is called, set RCV_SHUTDOWN flag.
7085 */
7086 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
7087 newsk->sk_shutdown |= RCV_SHUTDOWN;
7088
7089 newsk->sk_state = SCTP_SS_ESTABLISHED;
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07007090 sctp_release_sock(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07007091}
7092
Neil Horman4d93df02007-08-15 16:07:44 -07007093
Linus Torvalds1da177e2005-04-16 15:20:36 -07007094/* This proto struct describes the ULP interface for SCTP. */
7095struct proto sctp_prot = {
7096 .name = "SCTP",
7097 .owner = THIS_MODULE,
7098 .close = sctp_close,
7099 .connect = sctp_connect,
7100 .disconnect = sctp_disconnect,
7101 .accept = sctp_accept,
7102 .ioctl = sctp_ioctl,
7103 .init = sctp_init_sock,
7104 .destroy = sctp_destroy_sock,
7105 .shutdown = sctp_shutdown,
7106 .setsockopt = sctp_setsockopt,
7107 .getsockopt = sctp_getsockopt,
7108 .sendmsg = sctp_sendmsg,
7109 .recvmsg = sctp_recvmsg,
7110 .bind = sctp_bind,
7111 .backlog_rcv = sctp_backlog_rcv,
7112 .hash = sctp_hash,
7113 .unhash = sctp_unhash,
7114 .get_port = sctp_get_port,
7115 .obj_size = sizeof(struct sctp_sock),
Neil Horman4d93df02007-08-15 16:07:44 -07007116 .sysctl_mem = sysctl_sctp_mem,
7117 .sysctl_rmem = sysctl_sctp_rmem,
7118 .sysctl_wmem = sysctl_sctp_wmem,
7119 .memory_pressure = &sctp_memory_pressure,
7120 .enter_memory_pressure = sctp_enter_memory_pressure,
7121 .memory_allocated = &sctp_memory_allocated,
Pavel Emelyanov5f318862008-02-20 00:23:01 -08007122 .sockets_allocated = &sctp_sockets_allocated,
Linus Torvalds1da177e2005-04-16 15:20:36 -07007123};
7124
Eric Dumazetdfd56b82011-12-10 09:48:31 +00007125#if IS_ENABLED(CONFIG_IPV6)
Eric Dumazet8295b6d2007-11-05 23:40:28 -08007126
Linus Torvalds1da177e2005-04-16 15:20:36 -07007127struct proto sctpv6_prot = {
7128 .name = "SCTPv6",
7129 .owner = THIS_MODULE,
7130 .close = sctp_close,
7131 .connect = sctp_connect,
7132 .disconnect = sctp_disconnect,
7133 .accept = sctp_accept,
7134 .ioctl = sctp_ioctl,
7135 .init = sctp_init_sock,
7136 .destroy = sctp_destroy_sock,
7137 .shutdown = sctp_shutdown,
7138 .setsockopt = sctp_setsockopt,
7139 .getsockopt = sctp_getsockopt,
7140 .sendmsg = sctp_sendmsg,
7141 .recvmsg = sctp_recvmsg,
7142 .bind = sctp_bind,
7143 .backlog_rcv = sctp_backlog_rcv,
7144 .hash = sctp_hash,
7145 .unhash = sctp_unhash,
7146 .get_port = sctp_get_port,
7147 .obj_size = sizeof(struct sctp6_sock),
Neil Horman4d93df02007-08-15 16:07:44 -07007148 .sysctl_mem = sysctl_sctp_mem,
7149 .sysctl_rmem = sysctl_sctp_rmem,
7150 .sysctl_wmem = sysctl_sctp_wmem,
7151 .memory_pressure = &sctp_memory_pressure,
7152 .enter_memory_pressure = sctp_enter_memory_pressure,
7153 .memory_allocated = &sctp_memory_allocated,
Pavel Emelyanov5f318862008-02-20 00:23:01 -08007154 .sockets_allocated = &sctp_sockets_allocated,
Linus Torvalds1da177e2005-04-16 15:20:36 -07007155};
Eric Dumazetdfd56b82011-12-10 09:48:31 +00007156#endif /* IS_ENABLED(CONFIG_IPV6) */