blob: 408ebd0e73305b56b76dc139af29611742c8e82c [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74#include <net/ip.h>
75#include <net/icmp.h>
76#include <net/route.h>
77#include <net/ipv6.h>
78#include <net/inet_common.h>
79
80#include <linux/socket.h> /* for sa_family_t */
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040081#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070082#include <net/sock.h>
83#include <net/sctp/sctp.h>
84#include <net/sctp/sm.h>
85
86/* WARNING: Please do not remove the SCTP_STATIC attribute to
87 * any of the functions below as they are used to export functions
88 * used by a project regression testsuite.
89 */
90
91/* Forward declarations for internal helper functions. */
92static int sctp_writeable(struct sock *sk);
93static void sctp_wfree(struct sk_buff *skb);
94static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
95 size_t msg_len);
96static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
97static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
98static int sctp_wait_for_accept(struct sock *sk, long timeo);
99static void sctp_wait_for_close(struct sock *sk, long timeo);
100static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
101 union sctp_addr *addr, int len);
102static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
103static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
104static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
105static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
106static int sctp_send_asconf(struct sctp_association *asoc,
107 struct sctp_chunk *chunk);
108static int sctp_do_bind(struct sock *, union sctp_addr *, int);
109static int sctp_autobind(struct sock *sk);
110static void sctp_sock_migrate(struct sock *, struct sock *,
111 struct sctp_association *, sctp_socket_type_t);
112static char *sctp_hmac_alg = SCTP_COOKIE_HMAC_ALG;
113
Neil Horman4d93df02007-08-15 16:07:44 -0700114extern struct kmem_cache *sctp_bucket_cachep;
Eric Dumazet8d987e52010-11-09 23:24:26 +0000115extern long sysctl_sctp_mem[3];
Neil Horman4d93df02007-08-15 16:07:44 -0700116extern int sysctl_sctp_rmem[3];
117extern int sysctl_sctp_wmem[3];
118
Adrian Bunkb6fa1a42007-09-12 15:18:00 +0200119static int sctp_memory_pressure;
Eric Dumazet8d987e52010-11-09 23:24:26 +0000120static atomic_long_t sctp_memory_allocated;
Eric Dumazet17483762008-11-25 21:16:35 -0800121struct percpu_counter sctp_sockets_allocated;
Neil Horman4d93df02007-08-15 16:07:44 -0700122
Pavel Emelyanov5c52ba12008-07-16 20:28:10 -0700123static void sctp_enter_memory_pressure(struct sock *sk)
Neil Horman4d93df02007-08-15 16:07:44 -0700124{
125 sctp_memory_pressure = 1;
126}
127
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129/* Get the sndbuf space available at the time on the association. */
130static inline int sctp_wspace(struct sctp_association *asoc)
131{
Neil Horman4d93df02007-08-15 16:07:44 -0700132 int amt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Neil Horman4d93df02007-08-15 16:07:44 -0700134 if (asoc->ep->sndbuf_policy)
135 amt = asoc->sndbuf_used;
136 else
Eric Dumazet31e6d362009-06-17 19:05:41 -0700137 amt = sk_wmem_alloc_get(asoc->base.sk);
Neil Horman4d93df02007-08-15 16:07:44 -0700138
139 if (amt >= asoc->base.sk->sk_sndbuf) {
140 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
141 amt = 0;
142 else {
143 amt = sk_stream_wspace(asoc->base.sk);
144 if (amt < 0)
145 amt = 0;
146 }
Neil Horman4eb701d2005-04-28 12:02:04 -0700147 } else {
Neil Horman4d93df02007-08-15 16:07:44 -0700148 amt = asoc->base.sk->sk_sndbuf - amt;
Neil Horman4eb701d2005-04-28 12:02:04 -0700149 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 return amt;
151}
152
153/* Increment the used sndbuf space count of the corresponding association by
154 * the size of the outgoing data chunk.
155 * Also, set the skb destructor for sndbuf accounting later.
156 *
157 * Since it is always 1-1 between chunk and skb, and also a new skb is always
158 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
159 * destructor in the data chunk skb for the purpose of the sndbuf space
160 * tracking.
161 */
162static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
163{
164 struct sctp_association *asoc = chunk->asoc;
165 struct sock *sk = asoc->base.sk;
166
167 /* The sndbuf space is tracked per association. */
168 sctp_association_hold(asoc);
169
Neil Horman4eb701d2005-04-28 12:02:04 -0700170 skb_set_owner_w(chunk->skb, sk);
171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 chunk->skb->destructor = sctp_wfree;
173 /* Save the chunk pointer in skb for sctp_wfree to use later. */
174 *((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
175
Neil Horman4eb701d2005-04-28 12:02:04 -0700176 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
177 sizeof(struct sk_buff) +
178 sizeof(struct sctp_chunk);
179
Neil Horman4eb701d2005-04-28 12:02:04 -0700180 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
Hideo Aoki3ab224b2007-12-31 00:11:19 -0800181 sk->sk_wmem_queued += chunk->skb->truesize;
182 sk_mem_charge(sk, chunk->skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
185/* Verify that this is a valid address. */
186static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
187 int len)
188{
189 struct sctp_af *af;
190
191 /* Verify basic sockaddr. */
192 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
193 if (!af)
194 return -EINVAL;
195
196 /* Is this a valid SCTP address? */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700197 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 return -EINVAL;
199
200 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
201 return -EINVAL;
202
203 return 0;
204}
205
206/* Look up the association by its id. If this is not a UDP-style
207 * socket, the ID field is always ignored.
208 */
209struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
210{
211 struct sctp_association *asoc = NULL;
212
213 /* If this is not a UDP-style socket, assoc id should be ignored. */
214 if (!sctp_style(sk, UDP)) {
215 /* Return NULL if the socket state is not ESTABLISHED. It
216 * could be a TCP-style listening socket or a socket which
217 * hasn't yet called connect() to establish an association.
218 */
219 if (!sctp_sstate(sk, ESTABLISHED))
220 return NULL;
221
222 /* Get the first and the only association from the list. */
223 if (!list_empty(&sctp_sk(sk)->ep->asocs))
224 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
225 struct sctp_association, asocs);
226 return asoc;
227 }
228
229 /* Otherwise this is a UDP-style socket. */
230 if (!id || (id == (sctp_assoc_t)-1))
231 return NULL;
232
233 spin_lock_bh(&sctp_assocs_id_lock);
234 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
235 spin_unlock_bh(&sctp_assocs_id_lock);
236
237 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
238 return NULL;
239
240 return asoc;
241}
242
243/* Look up the transport from an address and an assoc id. If both address and
244 * id are specified, the associations matching the address and the id should be
245 * the same.
246 */
247static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
248 struct sockaddr_storage *addr,
249 sctp_assoc_t id)
250{
251 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
252 struct sctp_transport *transport;
253 union sctp_addr *laddr = (union sctp_addr *)addr;
254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
Al Virocd4ff032006-11-20 17:11:33 -0800256 laddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
259 if (!addr_asoc)
260 return NULL;
261
262 id_asoc = sctp_id2assoc(sk, id);
263 if (id_asoc && (id_asoc != addr_asoc))
264 return NULL;
265
266 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
267 (union sctp_addr *)addr);
268
269 return transport;
270}
271
272/* API 3.1.2 bind() - UDP Style Syntax
273 * The syntax of bind() is,
274 *
275 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
276 *
277 * sd - the socket descriptor returned by socket().
278 * addr - the address structure (struct sockaddr_in or struct
279 * sockaddr_in6 [RFC 2553]),
280 * addr_len - the size of the address structure.
281 */
Frank Filz3f7a87d2005-06-20 13:14:57 -0700282SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283{
284 int retval = 0;
285
286 sctp_lock_sock(sk);
287
Frank Filz3f7a87d2005-06-20 13:14:57 -0700288 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
289 sk, addr, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
291 /* Disallow binding twice. */
292 if (!sctp_sk(sk)->ep->base.bind_addr.port)
Frank Filz3f7a87d2005-06-20 13:14:57 -0700293 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 addr_len);
295 else
296 retval = -EINVAL;
297
298 sctp_release_sock(sk);
299
300 return retval;
301}
302
303static long sctp_get_port_local(struct sock *, union sctp_addr *);
304
305/* Verify this is a valid sockaddr. */
306static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
307 union sctp_addr *addr, int len)
308{
309 struct sctp_af *af;
310
311 /* Check minimum size. */
312 if (len < sizeof (struct sockaddr))
313 return NULL;
314
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700315 /* V4 mapped address are really of AF_INET family */
316 if (addr->sa.sa_family == AF_INET6 &&
317 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
318 if (!opt->pf->af_supported(AF_INET, opt))
319 return NULL;
320 } else {
321 /* Does this PF support this AF? */
322 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
323 return NULL;
324 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
326 /* If we get this far, af is valid. */
327 af = sctp_get_af_specific(addr->sa.sa_family);
328
329 if (len < af->sockaddr_len)
330 return NULL;
331
332 return af;
333}
334
335/* Bind a local address either to an endpoint or to an association. */
336SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
337{
338 struct sctp_sock *sp = sctp_sk(sk);
339 struct sctp_endpoint *ep = sp->ep;
340 struct sctp_bind_addr *bp = &ep->base.bind_addr;
341 struct sctp_af *af;
342 unsigned short snum;
343 int ret = 0;
344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 /* Common sockaddr verification. */
346 af = sctp_sockaddr_af(sp, addr, len);
Frank Filz3f7a87d2005-06-20 13:14:57 -0700347 if (!af) {
348 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
349 sk, addr, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 return -EINVAL;
Frank Filz3f7a87d2005-06-20 13:14:57 -0700351 }
352
353 snum = ntohs(addr->v4.sin_port);
354
355 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
356 ", port: %d, new port: %d, len: %d)\n",
357 sk,
358 addr,
359 bp->port, snum,
360 len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362 /* PF specific bind() address verification. */
363 if (!sp->pf->bind_verify(sp, addr))
364 return -EADDRNOTAVAIL;
365
Vlad Yasevich8b358052007-05-15 17:14:58 -0400366 /* We must either be unbound, or bind to the same port.
367 * It's OK to allow 0 ports if we are already bound.
368 * We'll just inhert an already bound port in this case
369 */
370 if (bp->port) {
371 if (!snum)
372 snum = bp->port;
373 else if (snum != bp->port) {
374 SCTP_DEBUG_PRINTK("sctp_do_bind:"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 " New port %d does not match existing port "
376 "%d.\n", snum, bp->port);
Vlad Yasevich8b358052007-05-15 17:14:58 -0400377 return -EINVAL;
378 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 }
380
381 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
382 return -EACCES;
383
Vlad Yasevich4e540642008-07-18 23:06:32 -0700384 /* See if the address matches any of the addresses we may have
385 * already bound before checking against other endpoints.
386 */
387 if (sctp_bind_addr_match(bp, addr, sp))
388 return -EINVAL;
389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 /* Make sure we are allowed to bind here.
391 * The function sctp_get_port_local() does duplicate address
392 * detection.
393 */
Vlad Yasevich2772b492007-08-21 14:24:30 +0900394 addr->v4.sin_port = htons(snum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 if ((ret = sctp_get_port_local(sk, addr))) {
Vlad Yasevich4e540642008-07-18 23:06:32 -0700396 return -EADDRINUSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 }
398
399 /* Refresh ephemeral port. */
400 if (!bp->port)
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000401 bp->port = inet_sk(sk)->inet_num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Vlad Yasevich559cf712007-09-16 16:03:28 -0700403 /* Add the address to the bind address list.
404 * Use GFP_ATOMIC since BHs will be disabled.
405 */
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800406 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
408 /* Copy back into socket for getsockname() use. */
409 if (!ret) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000410 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 af->to_sk_saddr(addr, sk);
412 }
413
414 return ret;
415}
416
417 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
418 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900419 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 * at any one time. If a sender, after sending an ASCONF chunk, decides
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900421 * it needs to transfer another ASCONF Chunk, it MUST wait until the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900423 * subsequent ASCONF. Note this restriction binds each side, so at any
424 * time two ASCONF may be in-transit on any given association (one sent
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 * from each endpoint).
426 */
427static int sctp_send_asconf(struct sctp_association *asoc,
428 struct sctp_chunk *chunk)
429{
430 int retval = 0;
431
432 /* If there is an outstanding ASCONF chunk, queue it for later
433 * transmission.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900434 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 if (asoc->addip_last_asconf) {
David S. Miller79af02c2005-07-08 21:47:49 -0700436 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900437 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 }
439
440 /* Hold the chunk until an ASCONF_ACK is received. */
441 sctp_chunk_hold(chunk);
442 retval = sctp_primitive_ASCONF(asoc, chunk);
443 if (retval)
444 sctp_chunk_free(chunk);
445 else
446 asoc->addip_last_asconf = chunk;
447
448out:
449 return retval;
450}
451
452/* Add a list of addresses as bind addresses to local endpoint or
453 * association.
454 *
455 * Basically run through each address specified in the addrs/addrcnt
456 * array/length pair, determine if it is IPv6 or IPv4 and call
457 * sctp_do_bind() on it.
458 *
459 * If any of them fails, then the operation will be reversed and the
460 * ones that were added will be removed.
461 *
462 * Only sctp_setsockopt_bindx() is supposed to call this function.
463 */
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +0200464static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465{
466 int cnt;
467 int retval = 0;
468 void *addr_buf;
469 struct sockaddr *sa_addr;
470 struct sctp_af *af;
471
472 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
473 sk, addrs, addrcnt);
474
475 addr_buf = addrs;
476 for (cnt = 0; cnt < addrcnt; cnt++) {
477 /* The list may contain either IPv4 or IPv6 address;
478 * determine the address length for walking thru the list.
479 */
Joe Perchesea110732011-06-13 16:21:26 +0000480 sa_addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 af = sctp_get_af_specific(sa_addr->sa_family);
482 if (!af) {
483 retval = -EINVAL;
484 goto err_bindx_add;
485 }
486
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900487 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 af->sockaddr_len);
489
490 addr_buf += af->sockaddr_len;
491
492err_bindx_add:
493 if (retval < 0) {
494 /* Failed. Cleanup the ones that have been added */
495 if (cnt > 0)
496 sctp_bindx_rem(sk, addrs, cnt);
497 return retval;
498 }
499 }
500
501 return retval;
502}
503
504/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
505 * associations that are part of the endpoint indicating that a list of local
506 * addresses are added to the endpoint.
507 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900508 * If any of the addresses is already in the bind address list of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 * association, we do not send the chunk for that association. But it will not
510 * affect other associations.
511 *
512 * Only sctp_setsockopt_bindx() is supposed to call this function.
513 */
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900514static int sctp_send_asconf_add_ip(struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 struct sockaddr *addrs,
516 int addrcnt)
517{
518 struct sctp_sock *sp;
519 struct sctp_endpoint *ep;
520 struct sctp_association *asoc;
521 struct sctp_bind_addr *bp;
522 struct sctp_chunk *chunk;
523 struct sctp_sockaddr_entry *laddr;
524 union sctp_addr *addr;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700525 union sctp_addr saveaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 void *addr_buf;
527 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 struct list_head *p;
529 int i;
530 int retval = 0;
531
532 if (!sctp_addip_enable)
533 return retval;
534
535 sp = sctp_sk(sk);
536 ep = sp->ep;
537
538 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800539 __func__, sk, addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700541 list_for_each_entry(asoc, &ep->asocs, asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543 if (!asoc->peer.asconf_capable)
544 continue;
545
546 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
547 continue;
548
549 if (!sctp_state(asoc, ESTABLISHED))
550 continue;
551
552 /* Check if any address in the packed array of addresses is
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900553 * in the bind address list of the association. If so,
554 * do not send the asconf chunk to its peer, but continue with
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 * other associations.
556 */
557 addr_buf = addrs;
558 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000559 addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 af = sctp_get_af_specific(addr->v4.sin_family);
561 if (!af) {
562 retval = -EINVAL;
563 goto out;
564 }
565
566 if (sctp_assoc_lookup_laddr(asoc, addr))
567 break;
568
569 addr_buf += af->sockaddr_len;
570 }
571 if (i < addrcnt)
572 continue;
573
Vlad Yasevich559cf712007-09-16 16:03:28 -0700574 /* Use the first valid address in bind addr list of
575 * association as Address Parameter of ASCONF CHUNK.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 bp = &asoc->base.bind_addr;
578 p = bp->address_list.next;
579 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
Al Viro5ae955c2006-11-20 17:22:08 -0800580 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 addrcnt, SCTP_PARAM_ADD_IP);
582 if (!chunk) {
583 retval = -ENOMEM;
584 goto out;
585 }
586
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700587 /* Add the new addresses to the bind address list with
588 * use_as_src set to 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 */
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700590 addr_buf = addrs;
591 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000592 addr = addr_buf;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700593 af = sctp_get_af_specific(addr->v4.sin_family);
594 memcpy(&saveaddr, addr, af->sockaddr_len);
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800595 retval = sctp_add_bind_addr(bp, &saveaddr,
596 SCTP_ADDR_NEW, GFP_ATOMIC);
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700597 addr_buf += af->sockaddr_len;
598 }
Michio Honda8a07eb02011-04-26 20:19:36 +0900599 if (asoc->src_out_of_asoc_ok) {
600 struct sctp_transport *trans;
601
602 list_for_each_entry(trans,
603 &asoc->peer.transport_addr_list, transports) {
604 /* Clear the source and route cache */
605 dst_release(trans->dst);
606 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
607 2*asoc->pathmtu, 4380));
608 trans->ssthresh = asoc->peer.i.a_rwnd;
609 trans->rto = asoc->rto_initial;
610 trans->rtt = trans->srtt = trans->rttvar = 0;
611 sctp_transport_route(trans, NULL,
612 sctp_sk(asoc->base.sk));
613 }
614 }
615 retval = sctp_send_asconf(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 }
617
618out:
619 return retval;
620}
621
622/* Remove a list of addresses from bind addresses list. Do not remove the
623 * last address.
624 *
625 * Basically run through each address specified in the addrs/addrcnt
626 * array/length pair, determine if it is IPv6 or IPv4 and call
627 * sctp_del_bind() on it.
628 *
629 * If any of them fails, then the operation will be reversed and the
630 * ones that were removed will be added back.
631 *
632 * At least one address has to be left; if only one address is
633 * available, the operation will return -EBUSY.
634 *
635 * Only sctp_setsockopt_bindx() is supposed to call this function.
636 */
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +0200637static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638{
639 struct sctp_sock *sp = sctp_sk(sk);
640 struct sctp_endpoint *ep = sp->ep;
641 int cnt;
642 struct sctp_bind_addr *bp = &ep->base.bind_addr;
643 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 void *addr_buf;
Al Viroc9a08502006-11-20 17:07:48 -0800645 union sctp_addr *sa_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 struct sctp_af *af;
647
648 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
649 sk, addrs, addrcnt);
650
651 addr_buf = addrs;
652 for (cnt = 0; cnt < addrcnt; cnt++) {
653 /* If the bind address list is empty or if there is only one
654 * bind address, there is nothing more to be removed (we need
655 * at least one address here).
656 */
657 if (list_empty(&bp->address_list) ||
658 (sctp_list_single_entry(&bp->address_list))) {
659 retval = -EBUSY;
660 goto err_bindx_rem;
661 }
662
Joe Perchesea110732011-06-13 16:21:26 +0000663 sa_addr = addr_buf;
Al Viroc9a08502006-11-20 17:07:48 -0800664 af = sctp_get_af_specific(sa_addr->sa.sa_family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 if (!af) {
666 retval = -EINVAL;
667 goto err_bindx_rem;
668 }
Paolo Galtieri0304ff8a2007-04-17 12:52:36 -0700669
670 if (!af->addr_valid(sa_addr, sp, NULL)) {
671 retval = -EADDRNOTAVAIL;
672 goto err_bindx_rem;
673 }
674
Vlad Yasevichee9cbac2011-04-18 19:14:47 +0000675 if (sa_addr->v4.sin_port &&
676 sa_addr->v4.sin_port != htons(bp->port)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 retval = -EINVAL;
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);
683
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 /* FIXME - There is probably a need to check if sk->sk_saddr and
685 * sk->sk_rcv_addr are currently set to one of the addresses to
686 * be removed. This is something which needs to be looked into
687 * when we are fixing the outstanding issues with multi-homing
688 * socket routing and failover schemes. Refer to comments in
689 * sctp_do_bind(). -daisy
690 */
Vlad Yasevich0ed90fb2007-10-24 16:10:00 -0400691 retval = sctp_del_bind_addr(bp, sa_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
693 addr_buf += af->sockaddr_len;
694err_bindx_rem:
695 if (retval < 0) {
696 /* Failed. Add the ones that has been removed back */
697 if (cnt > 0)
698 sctp_bindx_add(sk, addrs, cnt);
699 return retval;
700 }
701 }
702
703 return retval;
704}
705
706/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
707 * the associations that are part of the endpoint indicating that a list of
708 * local addresses are removed from the endpoint.
709 *
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900710 * If any of the addresses is already in the bind address list of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 * association, we do not send the chunk for that association. But it will not
712 * affect other associations.
713 *
714 * Only sctp_setsockopt_bindx() is supposed to call this function.
715 */
716static int sctp_send_asconf_del_ip(struct sock *sk,
717 struct sockaddr *addrs,
718 int addrcnt)
719{
720 struct sctp_sock *sp;
721 struct sctp_endpoint *ep;
722 struct sctp_association *asoc;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700723 struct sctp_transport *transport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 struct sctp_bind_addr *bp;
725 struct sctp_chunk *chunk;
726 union sctp_addr *laddr;
727 void *addr_buf;
728 struct sctp_af *af;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700729 struct sctp_sockaddr_entry *saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 int i;
731 int retval = 0;
Michio Honda8a07eb02011-04-26 20:19:36 +0900732 int stored = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Michio Honda8a07eb02011-04-26 20:19:36 +0900734 chunk = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 if (!sctp_addip_enable)
736 return retval;
737
738 sp = sctp_sk(sk);
739 ep = sp->ep;
740
741 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800742 __func__, sk, addrs, addrcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700744 list_for_each_entry(asoc, &ep->asocs, asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
746 if (!asoc->peer.asconf_capable)
747 continue;
748
749 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
750 continue;
751
752 if (!sctp_state(asoc, ESTABLISHED))
753 continue;
754
755 /* Check if any address in the packed array of addresses is
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900756 * not present in the bind address list of the association.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 * If so, do not send the asconf chunk to its peer, but
758 * continue with other associations.
759 */
760 addr_buf = addrs;
761 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000762 laddr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 af = sctp_get_af_specific(laddr->v4.sin_family);
764 if (!af) {
765 retval = -EINVAL;
766 goto out;
767 }
768
769 if (!sctp_assoc_lookup_laddr(asoc, laddr))
770 break;
771
772 addr_buf += af->sockaddr_len;
773 }
774 if (i < addrcnt)
775 continue;
776
777 /* Find one address in the association's bind address list
778 * that is not in the packed array of addresses. This is to
779 * make sure that we do not delete all the addresses in the
780 * association.
781 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 bp = &asoc->base.bind_addr;
783 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
784 addrcnt, sp);
Michio Honda8a07eb02011-04-26 20:19:36 +0900785 if ((laddr == NULL) && (addrcnt == 1)) {
786 if (asoc->asconf_addr_del_pending)
787 continue;
788 asoc->asconf_addr_del_pending =
789 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
Michio Honda6d65e5e2011-06-10 16:42:14 +0900790 if (asoc->asconf_addr_del_pending == NULL) {
791 retval = -ENOMEM;
792 goto out;
793 }
Michio Honda8a07eb02011-04-26 20:19:36 +0900794 asoc->asconf_addr_del_pending->sa.sa_family =
795 addrs->sa_family;
796 asoc->asconf_addr_del_pending->v4.sin_port =
797 htons(bp->port);
798 if (addrs->sa_family == AF_INET) {
799 struct sockaddr_in *sin;
800
801 sin = (struct sockaddr_in *)addrs;
802 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
803 } else if (addrs->sa_family == AF_INET6) {
804 struct sockaddr_in6 *sin6;
805
806 sin6 = (struct sockaddr_in6 *)addrs;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000807 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
Michio Honda8a07eb02011-04-26 20:19:36 +0900808 }
809 SCTP_DEBUG_PRINTK_IPADDR("send_asconf_del_ip: keep the last address asoc: %p ",
810 " at %p\n", asoc, asoc->asconf_addr_del_pending,
811 asoc->asconf_addr_del_pending);
812 asoc->src_out_of_asoc_ok = 1;
813 stored = 1;
814 goto skip_mkasconf;
815 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816
Vlad Yasevich559cf712007-09-16 16:03:28 -0700817 /* We do not need RCU protection throughout this loop
818 * because this is done under a socket lock from the
819 * setsockopt call.
820 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
822 SCTP_PARAM_DEL_IP);
823 if (!chunk) {
824 retval = -ENOMEM;
825 goto out;
826 }
827
Michio Honda8a07eb02011-04-26 20:19:36 +0900828skip_mkasconf:
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700829 /* Reset use_as_src flag for the addresses in the bind address
830 * list that are to be deleted.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 */
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700832 addr_buf = addrs;
833 for (i = 0; i < addrcnt; i++) {
Joe Perchesea110732011-06-13 16:21:26 +0000834 laddr = addr_buf;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700835 af = sctp_get_af_specific(laddr->v4.sin_family);
Vlad Yasevich559cf712007-09-16 16:03:28 -0700836 list_for_each_entry(saddr, &bp->address_list, list) {
Al Viro5f242a12006-11-20 17:05:23 -0800837 if (sctp_cmp_addr_exact(&saddr->a, laddr))
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800838 saddr->state = SCTP_ADDR_DEL;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700839 }
840 addr_buf += af->sockaddr_len;
841 }
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700842
843 /* Update the route and saddr entries for all the transports
844 * as some of the addresses in the bind address list are
845 * about to be deleted and cannot be used as source addresses.
846 */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -0700847 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
848 transports) {
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700849 dst_release(transport->dst);
850 sctp_transport_route(transport, NULL,
851 sctp_sk(asoc->base.sk));
852 }
853
Michio Honda8a07eb02011-04-26 20:19:36 +0900854 if (stored)
855 /* We don't need to transmit ASCONF */
856 continue;
Sridhar Samudraladc022a92006-07-21 14:49:25 -0700857 retval = sctp_send_asconf(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 }
859out:
860 return retval;
861}
862
Michio Honda9f7d6532011-04-26 19:32:51 +0900863/* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
864int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
865{
866 struct sock *sk = sctp_opt2sk(sp);
867 union sctp_addr *addr;
868 struct sctp_af *af;
869
870 /* It is safe to write port space in caller. */
871 addr = &addrw->a;
872 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
873 af = sctp_get_af_specific(addr->sa.sa_family);
874 if (!af)
875 return -EINVAL;
876 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
877 return -EINVAL;
878
879 if (addrw->state == SCTP_ADDR_NEW)
880 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
881 else
882 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
883}
884
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
886 *
887 * API 8.1
888 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
889 * int flags);
890 *
891 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
892 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
893 * or IPv6 addresses.
894 *
895 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
896 * Section 3.1.2 for this usage.
897 *
898 * addrs is a pointer to an array of one or more socket addresses. Each
899 * address is contained in its appropriate structure (i.e. struct
900 * sockaddr_in or struct sockaddr_in6) the family of the address type
Ville Nuorvala23c435f2006-10-16 22:08:28 -0700901 * must be used to distinguish the address length (note that this
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 * representation is termed a "packed array" of addresses). The caller
903 * specifies the number of addresses in the array with addrcnt.
904 *
905 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
906 * -1, and sets errno to the appropriate error code.
907 *
908 * For SCTP, the port given in each socket address must be the same, or
909 * sctp_bindx() will fail, setting errno to EINVAL.
910 *
911 * The flags parameter is formed from the bitwise OR of zero or more of
912 * the following currently defined flags:
913 *
914 * SCTP_BINDX_ADD_ADDR
915 *
916 * SCTP_BINDX_REM_ADDR
917 *
918 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
919 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
920 * addresses from the association. The two flags are mutually exclusive;
921 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
922 * not remove all addresses from an association; sctp_bindx() will
923 * reject such an attempt with EINVAL.
924 *
925 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
926 * additional addresses with an endpoint after calling bind(). Or use
927 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
928 * socket is associated with so that no new association accepted will be
929 * associated with those addresses. If the endpoint supports dynamic
930 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
931 * endpoint to send the appropriate message to the peer to change the
932 * peers address lists.
933 *
934 * Adding and removing addresses from a connected association is
935 * optional functionality. Implementations that do not support this
936 * functionality should return EOPNOTSUPP.
937 *
938 * Basically do nothing but copying the addresses from user to kernel
939 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
Frank Filz3f7a87d2005-06-20 13:14:57 -0700940 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
941 * from userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 *
943 * We don't use copy_from_user() for optimization: we first do the
944 * sanity checks (buffer size -fast- and access check-healthy
945 * pointer); if all of those succeed, then we can alloc the memory
946 * (expensive operation) needed to copy the data to kernel. Then we do
947 * the copying without checking the user space area
948 * (__copy_from_user()).
949 *
950 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
951 * it.
952 *
953 * sk The sk of the socket
954 * addrs The pointer to the addresses in user land
955 * addrssize Size of the addrs buffer
956 * op Operation to perform (add or remove, see the flags of
957 * sctp_bindx)
958 *
959 * Returns 0 if ok, <0 errno code on error.
960 */
961SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk,
962 struct sockaddr __user *addrs,
963 int addrs_size, int op)
964{
965 struct sockaddr *kaddrs;
966 int err;
967 int addrcnt = 0;
968 int walk_size = 0;
969 struct sockaddr *sa_addr;
970 void *addr_buf;
971 struct sctp_af *af;
972
973 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
974 " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
975
976 if (unlikely(addrs_size <= 0))
977 return -EINVAL;
978
979 /* Check the user passed a healthy pointer. */
980 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
981 return -EFAULT;
982
983 /* Alloc space for the address array in kernel memory. */
Kris Katterjohn8b3a7002006-01-11 15:56:43 -0800984 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 if (unlikely(!kaddrs))
986 return -ENOMEM;
987
988 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
989 kfree(kaddrs);
990 return -EFAULT;
991 }
992
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900993 /* Walk through the addrs buffer and count the number of addresses. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 addr_buf = kaddrs;
995 while (walk_size < addrs_size) {
Dan Rosenbergd7e0d192010-10-01 11:16:58 +0000996 if (walk_size + sizeof(sa_family_t) > addrs_size) {
997 kfree(kaddrs);
998 return -EINVAL;
999 }
1000
Joe Perchesea110732011-06-13 16:21:26 +00001001 sa_addr = addr_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 af = sctp_get_af_specific(sa_addr->sa_family);
1003
1004 /* If the address family is not supported or if this address
1005 * causes the address buffer to overflow return EINVAL.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001006 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1008 kfree(kaddrs);
1009 return -EINVAL;
1010 }
1011 addrcnt++;
1012 addr_buf += af->sockaddr_len;
1013 walk_size += af->sockaddr_len;
1014 }
1015
1016 /* Do the work. */
1017 switch (op) {
1018 case SCTP_BINDX_ADD_ADDR:
1019 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1020 if (err)
1021 goto out;
1022 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1023 break;
1024
1025 case SCTP_BINDX_REM_ADDR:
1026 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1027 if (err)
1028 goto out;
1029 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1030 break;
1031
1032 default:
1033 err = -EINVAL;
1034 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001035 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036
1037out:
1038 kfree(kaddrs);
1039
1040 return err;
1041}
1042
Frank Filz3f7a87d2005-06-20 13:14:57 -07001043/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1044 *
1045 * Common routine for handling connect() and sctp_connectx().
1046 * Connect will come in with just a single address.
1047 */
1048static int __sctp_connect(struct sock* sk,
1049 struct sockaddr *kaddrs,
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001050 int addrs_size,
1051 sctp_assoc_t *assoc_id)
Frank Filz3f7a87d2005-06-20 13:14:57 -07001052{
1053 struct sctp_sock *sp;
1054 struct sctp_endpoint *ep;
1055 struct sctp_association *asoc = NULL;
1056 struct sctp_association *asoc2;
1057 struct sctp_transport *transport;
1058 union sctp_addr to;
1059 struct sctp_af *af;
1060 sctp_scope_t scope;
1061 long timeo;
1062 int err = 0;
1063 int addrcnt = 0;
1064 int walk_size = 0;
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001065 union sctp_addr *sa_addr = NULL;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001066 void *addr_buf;
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001067 unsigned short port;
Vlad Yasevichf50f95c2007-07-03 12:47:40 -04001068 unsigned int f_flags = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001069
1070 sp = sctp_sk(sk);
1071 ep = sp->ep;
1072
1073 /* connect() cannot be done on a socket that is already in ESTABLISHED
1074 * state - UDP-style peeled off socket or a TCP-style socket that
1075 * is already connected.
1076 * It cannot be done even on a TCP-style listening socket.
1077 */
1078 if (sctp_sstate(sk, ESTABLISHED) ||
1079 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1080 err = -EISCONN;
1081 goto out_free;
1082 }
1083
1084 /* Walk through the addrs buffer and count the number of addresses. */
1085 addr_buf = kaddrs;
1086 while (walk_size < addrs_size) {
Dan Rosenbergd7e0d192010-10-01 11:16:58 +00001087 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1088 err = -EINVAL;
1089 goto out_free;
1090 }
1091
Joe Perchesea110732011-06-13 16:21:26 +00001092 sa_addr = addr_buf;
Al Viro4bdf4b52006-11-20 17:10:20 -08001093 af = sctp_get_af_specific(sa_addr->sa.sa_family);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001094
1095 /* If the address family is not supported or if this address
1096 * causes the address buffer to overflow return EINVAL.
1097 */
1098 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1099 err = -EINVAL;
1100 goto out_free;
1101 }
1102
Dan Rosenbergd7e0d192010-10-01 11:16:58 +00001103 port = ntohs(sa_addr->v4.sin_port);
1104
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001105 /* Save current address so we can work with it */
1106 memcpy(&to, sa_addr, af->sockaddr_len);
1107
1108 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001109 if (err)
1110 goto out_free;
1111
Vlad Yasevich16d00fb2007-05-04 13:34:09 -07001112 /* Make sure the destination port is correctly set
1113 * in all addresses.
1114 */
1115 if (asoc && asoc->peer.port && asoc->peer.port != port)
1116 goto out_free;
1117
Frank Filz3f7a87d2005-06-20 13:14:57 -07001118
1119 /* Check if there already is a matching association on the
1120 * endpoint (other than the one created here).
1121 */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001122 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001123 if (asoc2 && asoc2 != asoc) {
1124 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1125 err = -EISCONN;
1126 else
1127 err = -EALREADY;
1128 goto out_free;
1129 }
1130
1131 /* If we could not find a matching association on the endpoint,
1132 * make sure that there is no peeled-off association matching
1133 * the peer address even on another socket.
1134 */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001135 if (sctp_endpoint_is_peeled_off(ep, &to)) {
Frank Filz3f7a87d2005-06-20 13:14:57 -07001136 err = -EADDRNOTAVAIL;
1137 goto out_free;
1138 }
1139
1140 if (!asoc) {
1141 /* If a bind() or sctp_bindx() is not called prior to
1142 * an sctp_connectx() call, the system picks an
1143 * ephemeral port and will choose an address set
1144 * equivalent to binding with a wildcard address.
1145 */
1146 if (!ep->base.bind_addr.port) {
1147 if (sctp_autobind(sk)) {
1148 err = -EAGAIN;
1149 goto out_free;
1150 }
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001151 } else {
1152 /*
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001153 * If an unprivileged user inherits a 1-many
1154 * style socket with open associations on a
1155 * privileged port, it MAY be permitted to
1156 * accept new associations, but it SHOULD NOT
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001157 * be permitted to open new associations.
1158 */
1159 if (ep->base.bind_addr.port < PROT_SOCK &&
1160 !capable(CAP_NET_BIND_SERVICE)) {
1161 err = -EACCES;
1162 goto out_free;
1163 }
Frank Filz3f7a87d2005-06-20 13:14:57 -07001164 }
1165
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001166 scope = sctp_scope(&to);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001167 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1168 if (!asoc) {
1169 err = -ENOMEM;
1170 goto out_free;
1171 }
Vlad Yasevich409b95a2009-11-10 08:57:34 +00001172
1173 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1174 GFP_KERNEL);
1175 if (err < 0) {
1176 goto out_free;
1177 }
1178
Frank Filz3f7a87d2005-06-20 13:14:57 -07001179 }
1180
1181 /* Prime the peer's transport structures. */
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001182 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001183 SCTP_UNKNOWN);
1184 if (!transport) {
1185 err = -ENOMEM;
1186 goto out_free;
1187 }
1188
1189 addrcnt++;
1190 addr_buf += af->sockaddr_len;
1191 walk_size += af->sockaddr_len;
1192 }
1193
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001194 /* In case the user of sctp_connectx() wants an association
1195 * id back, assign one now.
1196 */
1197 if (assoc_id) {
1198 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1199 if (err < 0)
1200 goto out_free;
1201 }
1202
Frank Filz3f7a87d2005-06-20 13:14:57 -07001203 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1204 if (err < 0) {
1205 goto out_free;
1206 }
1207
1208 /* Initialize sk's dport and daddr for getpeername() */
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001209 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
Vlad Yaseviche4d1fea2007-08-01 10:56:43 -04001210 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1211 af->to_sk_daddr(sa_addr, sk);
Sridhar Samudrala8de8c872006-05-19 10:58:12 -07001212 sk->sk_err = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001213
Vlad Yasevichf50f95c2007-07-03 12:47:40 -04001214 /* in-kernel sockets don't generally have a file allocated to them
1215 * if all they do is call sock_create_kern().
1216 */
1217 if (sk->sk_socket->file)
1218 f_flags = sk->sk_socket->file->f_flags;
1219
1220 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1221
Frank Filz3f7a87d2005-06-20 13:14:57 -07001222 err = sctp_wait_for_connect(asoc, &timeo);
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001223 if ((err == 0 || err == -EINPROGRESS) && assoc_id)
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001224 *assoc_id = asoc->assoc_id;
Frank Filz3f7a87d2005-06-20 13:14:57 -07001225
1226 /* Don't free association on exit. */
1227 asoc = NULL;
1228
1229out_free:
1230
1231 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001232 " kaddrs: %p err: %d\n",
1233 asoc, kaddrs, err);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001234 if (asoc)
1235 sctp_association_free(asoc);
1236 return err;
1237}
1238
1239/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1240 *
1241 * API 8.9
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001242 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1243 * sctp_assoc_t *asoc);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001244 *
1245 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1246 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1247 * or IPv6 addresses.
1248 *
1249 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1250 * Section 3.1.2 for this usage.
1251 *
1252 * addrs is a pointer to an array of one or more socket addresses. Each
1253 * address is contained in its appropriate structure (i.e. struct
1254 * sockaddr_in or struct sockaddr_in6) the family of the address type
1255 * must be used to distengish the address length (note that this
1256 * representation is termed a "packed array" of addresses). The caller
1257 * specifies the number of addresses in the array with addrcnt.
1258 *
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001259 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1260 * the association id of the new association. On failure, sctp_connectx()
1261 * returns -1, and sets errno to the appropriate error code. The assoc_id
1262 * is not touched by the kernel.
Frank Filz3f7a87d2005-06-20 13:14:57 -07001263 *
1264 * For SCTP, the port given in each socket address must be the same, or
1265 * sctp_connectx() will fail, setting errno to EINVAL.
1266 *
1267 * An application can use sctp_connectx to initiate an association with
1268 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1269 * allows a caller to specify multiple addresses at which a peer can be
1270 * reached. The way the SCTP stack uses the list of addresses to set up
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001271 * the association is implementation dependent. This function only
Frank Filz3f7a87d2005-06-20 13:14:57 -07001272 * specifies that the stack will try to make use of all the addresses in
1273 * the list when needed.
1274 *
1275 * Note that the list of addresses passed in is only used for setting up
1276 * the association. It does not necessarily equal the set of addresses
1277 * the peer uses for the resulting association. If the caller wants to
1278 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1279 * retrieve them after the association has been set up.
1280 *
1281 * Basically do nothing but copying the addresses from user to kernel
1282 * land and invoking either sctp_connectx(). This is used for tunneling
1283 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1284 *
1285 * We don't use copy_from_user() for optimization: we first do the
1286 * sanity checks (buffer size -fast- and access check-healthy
1287 * pointer); if all of those succeed, then we can alloc the memory
1288 * (expensive operation) needed to copy the data to kernel. Then we do
1289 * the copying without checking the user space area
1290 * (__copy_from_user()).
1291 *
1292 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1293 * it.
1294 *
1295 * sk The sk of the socket
1296 * addrs The pointer to the addresses in user land
1297 * addrssize Size of the addrs buffer
1298 *
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001299 * Returns >=0 if ok, <0 errno code on error.
Frank Filz3f7a87d2005-06-20 13:14:57 -07001300 */
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001301SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk,
Frank Filz3f7a87d2005-06-20 13:14:57 -07001302 struct sockaddr __user *addrs,
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001303 int addrs_size,
1304 sctp_assoc_t *assoc_id)
Frank Filz3f7a87d2005-06-20 13:14:57 -07001305{
1306 int err = 0;
1307 struct sockaddr *kaddrs;
1308
1309 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -08001310 __func__, sk, addrs, addrs_size);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001311
1312 if (unlikely(addrs_size <= 0))
1313 return -EINVAL;
1314
1315 /* Check the user passed a healthy pointer. */
1316 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1317 return -EFAULT;
1318
1319 /* Alloc space for the address array in kernel memory. */
Kris Katterjohn8b3a7002006-01-11 15:56:43 -08001320 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001321 if (unlikely(!kaddrs))
1322 return -ENOMEM;
1323
1324 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1325 err = -EFAULT;
1326 } else {
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001327 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
Frank Filz3f7a87d2005-06-20 13:14:57 -07001328 }
1329
1330 kfree(kaddrs);
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001331
Frank Filz3f7a87d2005-06-20 13:14:57 -07001332 return err;
1333}
1334
Vlad Yasevich88a0a942008-05-09 15:14:11 -07001335/*
1336 * This is an older interface. It's kept for backward compatibility
1337 * to the option that doesn't provide association id.
1338 */
1339SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk,
1340 struct sockaddr __user *addrs,
1341 int addrs_size)
1342{
1343 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1344}
1345
1346/*
1347 * New interface for the API. The since the API is done with a socket
1348 * option, to make it simple we feed back the association id is as a return
1349 * indication to the call. Error is always negative and association id is
1350 * always positive.
1351 */
1352SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
1353 struct sockaddr __user *addrs,
1354 int addrs_size)
1355{
1356 sctp_assoc_t assoc_id = 0;
1357 int err = 0;
1358
1359 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1360
1361 if (err)
1362 return err;
1363 else
1364 return assoc_id;
1365}
1366
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001367/*
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001368 * New (hopefully final) interface for the API.
1369 * We use the sctp_getaddrs_old structure so that use-space library
1370 * can avoid any unnecessary allocations. The only defferent part
1371 * is that we store the actual length of the address buffer into the
1372 * addrs_num structure member. That way we can re-use the existing
1373 * code.
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001374 */
1375SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len,
1376 char __user *optval,
1377 int __user *optlen)
1378{
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001379 struct sctp_getaddrs_old param;
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001380 sctp_assoc_t assoc_id = 0;
1381 int err = 0;
1382
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001383 if (len < sizeof(param))
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001384 return -EINVAL;
1385
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001386 if (copy_from_user(&param, optval, sizeof(param)))
1387 return -EFAULT;
1388
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001389 err = __sctp_setsockopt_connectx(sk,
Vlad Yasevichf9c67812009-11-11 08:19:24 +00001390 (struct sockaddr __user *)param.addrs,
1391 param.addr_num, &assoc_id);
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04001392
1393 if (err == 0 || err == -EINPROGRESS) {
1394 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1395 return -EFAULT;
1396 if (put_user(sizeof(assoc_id), optlen))
1397 return -EFAULT;
1398 }
1399
1400 return err;
1401}
1402
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403/* API 3.1.4 close() - UDP Style Syntax
1404 * Applications use close() to perform graceful shutdown (as described in
1405 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1406 * by a UDP-style socket.
1407 *
1408 * The syntax is
1409 *
1410 * ret = close(int sd);
1411 *
1412 * sd - the socket descriptor of the associations to be closed.
1413 *
1414 * To gracefully shutdown a specific association represented by the
1415 * UDP-style socket, an application should use the sendmsg() call,
1416 * passing no user data, but including the appropriate flag in the
1417 * ancillary data (see Section xxxx).
1418 *
1419 * If sd in the close() call is a branched-off socket representing only
1420 * one association, the shutdown is performed on that association only.
1421 *
1422 * 4.1.6 close() - TCP Style Syntax
1423 *
1424 * Applications use close() to gracefully close down an association.
1425 *
1426 * The syntax is:
1427 *
1428 * int close(int sd);
1429 *
1430 * sd - the socket descriptor of the association to be closed.
1431 *
1432 * After an application calls close() on a socket descriptor, no further
1433 * socket operations will succeed on that descriptor.
1434 *
1435 * API 7.1.4 SO_LINGER
1436 *
1437 * An application using the TCP-style socket can use this option to
1438 * perform the SCTP ABORT primitive. The linger option structure is:
1439 *
1440 * struct linger {
1441 * int l_onoff; // option on/off
1442 * int l_linger; // linger time
1443 * };
1444 *
1445 * To enable the option, set l_onoff to 1. If the l_linger value is set
1446 * to 0, calling close() is the same as the ABORT primitive. If the
1447 * value is set to a negative value, the setsockopt() call will return
1448 * an error. If the value is set to a positive value linger_time, the
1449 * close() can be blocked for at most linger_time ms. If the graceful
1450 * shutdown phase does not finish during this period, close() will
1451 * return but the graceful shutdown phase continues in the system.
1452 */
1453SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
1454{
1455 struct sctp_endpoint *ep;
1456 struct sctp_association *asoc;
1457 struct list_head *pos, *temp;
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001458 unsigned int data_was_unread;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459
1460 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
1461
1462 sctp_lock_sock(sk);
1463 sk->sk_shutdown = SHUTDOWN_MASK;
Vlad Yasevichbec96402009-07-30 18:08:28 -04001464 sk->sk_state = SCTP_SS_CLOSING;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465
1466 ep = sctp_sk(sk)->ep;
1467
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001468 /* Clean up any skbs sitting on the receive queue. */
1469 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1470 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1471
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07001472 /* Walk all associations on an endpoint. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 list_for_each_safe(pos, temp, &ep->asocs) {
1474 asoc = list_entry(pos, struct sctp_association, asocs);
1475
1476 if (sctp_style(sk, TCP)) {
1477 /* A closed association can still be in the list if
1478 * it belongs to a TCP-style listening socket that is
1479 * not yet accepted. If so, free it. If not, send an
1480 * ABORT or SHUTDOWN based on the linger options.
1481 */
1482 if (sctp_state(asoc, CLOSED)) {
1483 sctp_unhash_established(asoc);
1484 sctp_association_free(asoc);
Vladislav Yasevichb89498a2006-05-19 14:32:06 -07001485 continue;
1486 }
1487 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488
Thomas Grafcd4fcc72011-07-08 04:37:46 +00001489 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1490 !skb_queue_empty(&asoc->ulpq.reasm) ||
1491 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
Sridhar Samudralab9ac8672006-08-28 13:53:01 -07001492 struct sctp_chunk *chunk;
1493
1494 chunk = sctp_make_abort_user(asoc, NULL, 0);
1495 if (chunk)
1496 sctp_primitive_ABORT(asoc, chunk);
1497 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 sctp_primitive_SHUTDOWN(asoc, NULL);
1499 }
1500
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501 /* On a TCP-style socket, block for at most linger_time if set. */
1502 if (sctp_style(sk, TCP) && timeout)
1503 sctp_wait_for_close(sk, timeout);
1504
1505 /* This will run the backlog queue. */
1506 sctp_release_sock(sk);
1507
1508 /* Supposedly, no process has access to the socket, but
1509 * the net layers still may.
1510 */
1511 sctp_local_bh_disable();
1512 sctp_bh_lock_sock(sk);
1513
1514 /* Hold the sock, since sk_common_release() will put sock_put()
1515 * and we have just a little more cleanup.
1516 */
1517 sock_hold(sk);
1518 sk_common_release(sk);
1519
1520 sctp_bh_unlock_sock(sk);
1521 sctp_local_bh_enable();
1522
1523 sock_put(sk);
1524
1525 SCTP_DBG_OBJCNT_DEC(sock);
1526}
1527
1528/* Handle EPIPE error. */
1529static int sctp_error(struct sock *sk, int flags, int err)
1530{
1531 if (err == -EPIPE)
1532 err = sock_error(sk) ? : -EPIPE;
1533 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1534 send_sig(SIGPIPE, current, 0);
1535 return err;
1536}
1537
1538/* API 3.1.3 sendmsg() - UDP Style Syntax
1539 *
1540 * An application uses sendmsg() and recvmsg() calls to transmit data to
1541 * and receive data from its peer.
1542 *
1543 * ssize_t sendmsg(int socket, const struct msghdr *message,
1544 * int flags);
1545 *
1546 * socket - the socket descriptor of the endpoint.
1547 * message - pointer to the msghdr structure which contains a single
1548 * user message and possibly some ancillary data.
1549 *
1550 * See Section 5 for complete description of the data
1551 * structures.
1552 *
1553 * flags - flags sent or received with the user message, see Section
1554 * 5 for complete description of the flags.
1555 *
1556 * Note: This function could use a rewrite especially when explicit
1557 * connect support comes in.
1558 */
1559/* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1560
1561SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1562
1563SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1564 struct msghdr *msg, size_t msg_len)
1565{
1566 struct sctp_sock *sp;
1567 struct sctp_endpoint *ep;
1568 struct sctp_association *new_asoc=NULL, *asoc=NULL;
1569 struct sctp_transport *transport, *chunk_tp;
1570 struct sctp_chunk *chunk;
Al Virodce116a2006-11-20 17:25:15 -08001571 union sctp_addr to;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572 struct sockaddr *msg_name = NULL;
Joe Perches517aa0b2011-05-12 11:27:20 +00001573 struct sctp_sndrcvinfo default_sinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574 struct sctp_sndrcvinfo *sinfo;
1575 struct sctp_initmsg *sinit;
1576 sctp_assoc_t associd = 0;
1577 sctp_cmsgs_t cmsgs = { NULL };
1578 int err;
1579 sctp_scope_t scope;
1580 long timeo;
1581 __u16 sinfo_flags = 0;
1582 struct sctp_datamsg *datamsg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583 int msg_flags = msg->msg_flags;
1584
1585 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1586 sk, msg, msg_len);
1587
1588 err = 0;
1589 sp = sctp_sk(sk);
1590 ep = sp->ep;
1591
Frank Filz3f7a87d2005-06-20 13:14:57 -07001592 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593
1594 /* We cannot send a message over a TCP-style listening socket. */
1595 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1596 err = -EPIPE;
1597 goto out_nounlock;
1598 }
1599
1600 /* Parse out the SCTP CMSGs. */
1601 err = sctp_msghdr_parse(msg, &cmsgs);
1602
1603 if (err) {
1604 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
1605 goto out_nounlock;
1606 }
1607
1608 /* Fetch the destination address for this packet. This
1609 * address only selects the association--it is not necessarily
1610 * the address we will send to.
1611 * For a peeled-off socket, msg_name is ignored.
1612 */
1613 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1614 int msg_namelen = msg->msg_namelen;
1615
1616 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1617 msg_namelen);
1618 if (err)
1619 return err;
1620
1621 if (msg_namelen > sizeof(to))
1622 msg_namelen = sizeof(to);
1623 memcpy(&to, msg->msg_name, msg_namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 msg_name = msg->msg_name;
1625 }
1626
1627 sinfo = cmsgs.info;
1628 sinit = cmsgs.init;
1629
1630 /* Did the user specify SNDRCVINFO? */
1631 if (sinfo) {
1632 sinfo_flags = sinfo->sinfo_flags;
1633 associd = sinfo->sinfo_assoc_id;
1634 }
1635
1636 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1637 msg_len, sinfo_flags);
1638
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001639 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1640 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 err = -EINVAL;
1642 goto out_nounlock;
1643 }
1644
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001645 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1646 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1647 * If SCTP_ABORT is set, the message length could be non zero with
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 * the msg_iov set to the user abort reason.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001649 */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001650 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1651 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652 err = -EINVAL;
1653 goto out_nounlock;
1654 }
1655
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001656 /* If SCTP_ADDR_OVER is set, there must be an address
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657 * specified in msg_name.
1658 */
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001659 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 err = -EINVAL;
1661 goto out_nounlock;
1662 }
1663
1664 transport = NULL;
1665
1666 SCTP_DEBUG_PRINTK("About to look up association.\n");
1667
1668 sctp_lock_sock(sk);
1669
1670 /* If a msg_name has been specified, assume this is to be used. */
1671 if (msg_name) {
1672 /* Look for a matching association on the endpoint. */
Al Virodce116a2006-11-20 17:25:15 -08001673 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 if (!asoc) {
1675 /* If we could not find a matching association on the
1676 * endpoint, make sure that it is not a TCP-style
1677 * socket that already has an association or there is
1678 * no peeled-off association on another socket.
1679 */
1680 if ((sctp_style(sk, TCP) &&
1681 sctp_sstate(sk, ESTABLISHED)) ||
Al Virodce116a2006-11-20 17:25:15 -08001682 sctp_endpoint_is_peeled_off(ep, &to)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683 err = -EADDRNOTAVAIL;
1684 goto out_unlock;
1685 }
1686 }
1687 } else {
1688 asoc = sctp_id2assoc(sk, associd);
1689 if (!asoc) {
1690 err = -EPIPE;
1691 goto out_unlock;
1692 }
1693 }
1694
1695 if (asoc) {
1696 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
1697
1698 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1699 * socket that has an association in CLOSED state. This can
1700 * happen when an accepted socket has an association that is
1701 * already CLOSED.
1702 */
1703 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1704 err = -EPIPE;
1705 goto out_unlock;
1706 }
1707
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001708 if (sinfo_flags & SCTP_EOF) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1710 asoc);
1711 sctp_primitive_SHUTDOWN(asoc, NULL);
1712 err = 0;
1713 goto out_unlock;
1714 }
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001715 if (sinfo_flags & SCTP_ABORT) {
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001716
1717 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1718 if (!chunk) {
1719 err = -ENOMEM;
1720 goto out_unlock;
1721 }
1722
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
Sridhar Samudralac164a9b2006-08-22 11:50:39 -07001724 sctp_primitive_ABORT(asoc, chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 err = 0;
1726 goto out_unlock;
1727 }
1728 }
1729
1730 /* Do we need to create the association? */
1731 if (!asoc) {
1732 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1733
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001734 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735 err = -EINVAL;
1736 goto out_unlock;
1737 }
1738
1739 /* Check for invalid stream against the stream counts,
1740 * either the default or the user specified stream counts.
1741 */
1742 if (sinfo) {
1743 if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1744 /* Check against the defaults. */
1745 if (sinfo->sinfo_stream >=
1746 sp->initmsg.sinit_num_ostreams) {
1747 err = -EINVAL;
1748 goto out_unlock;
1749 }
1750 } else {
1751 /* Check against the requested. */
1752 if (sinfo->sinfo_stream >=
1753 sinit->sinit_num_ostreams) {
1754 err = -EINVAL;
1755 goto out_unlock;
1756 }
1757 }
1758 }
1759
1760 /*
1761 * API 3.1.2 bind() - UDP Style Syntax
1762 * If a bind() or sctp_bindx() is not called prior to a
1763 * sendmsg() call that initiates a new association, the
1764 * system picks an ephemeral port and will choose an address
1765 * set equivalent to binding with a wildcard address.
1766 */
1767 if (!ep->base.bind_addr.port) {
1768 if (sctp_autobind(sk)) {
1769 err = -EAGAIN;
1770 goto out_unlock;
1771 }
Ivan Skytte Jorgensen64a0c1c2005-10-28 15:39:02 -07001772 } else {
1773 /*
1774 * If an unprivileged user inherits a one-to-many
1775 * style socket with open associations on a privileged
1776 * port, it MAY be permitted to accept new associations,
1777 * but it SHOULD NOT be permitted to open new
1778 * associations.
1779 */
1780 if (ep->base.bind_addr.port < PROT_SOCK &&
1781 !capable(CAP_NET_BIND_SERVICE)) {
1782 err = -EACCES;
1783 goto out_unlock;
1784 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785 }
1786
1787 scope = sctp_scope(&to);
1788 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1789 if (!new_asoc) {
1790 err = -ENOMEM;
1791 goto out_unlock;
1792 }
1793 asoc = new_asoc;
Vlad Yasevich409b95a2009-11-10 08:57:34 +00001794 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1795 if (err < 0) {
1796 err = -ENOMEM;
1797 goto out_free;
1798 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799
1800 /* If the SCTP_INIT ancillary data is specified, set all
1801 * the association init values accordingly.
1802 */
1803 if (sinit) {
1804 if (sinit->sinit_num_ostreams) {
1805 asoc->c.sinit_num_ostreams =
1806 sinit->sinit_num_ostreams;
1807 }
1808 if (sinit->sinit_max_instreams) {
1809 asoc->c.sinit_max_instreams =
1810 sinit->sinit_max_instreams;
1811 }
1812 if (sinit->sinit_max_attempts) {
1813 asoc->max_init_attempts
1814 = sinit->sinit_max_attempts;
1815 }
1816 if (sinit->sinit_max_init_timeo) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09001817 asoc->max_init_timeo =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1819 }
1820 }
1821
1822 /* Prime the peer's transport structures. */
Al Virodce116a2006-11-20 17:25:15 -08001823 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824 if (!transport) {
1825 err = -ENOMEM;
1826 goto out_free;
1827 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828 }
1829
1830 /* ASSERT: we have a valid association at this point. */
1831 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1832
1833 if (!sinfo) {
1834 /* If the user didn't specify SNDRCVINFO, make up one with
1835 * some defaults.
1836 */
Joe Perches517aa0b2011-05-12 11:27:20 +00001837 memset(&default_sinfo, 0, sizeof(default_sinfo));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838 default_sinfo.sinfo_stream = asoc->default_stream;
1839 default_sinfo.sinfo_flags = asoc->default_flags;
1840 default_sinfo.sinfo_ppid = asoc->default_ppid;
1841 default_sinfo.sinfo_context = asoc->default_context;
1842 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1843 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1844 sinfo = &default_sinfo;
1845 }
1846
1847 /* API 7.1.7, the sndbuf size per association bounds the
1848 * maximum size of data that can be sent in a single send call.
1849 */
1850 if (msg_len > sk->sk_sndbuf) {
1851 err = -EMSGSIZE;
1852 goto out_free;
1853 }
1854
Vlad Yasevich8a479492007-06-07 14:21:05 -04001855 if (asoc->pmtu_pending)
1856 sctp_assoc_pending_pmtu(asoc);
1857
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858 /* If fragmentation is disabled and the message length exceeds the
1859 * association fragmentation point, return EMSGSIZE. The I-D
1860 * does not specify what this error is, but this looks like
1861 * a great fit.
1862 */
1863 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1864 err = -EMSGSIZE;
1865 goto out_free;
1866 }
1867
Joe Perchesafd76142011-05-12 09:19:10 +00001868 /* Check for invalid stream. */
1869 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1870 err = -EINVAL;
1871 goto out_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 }
1873
1874 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1875 if (!sctp_wspace(asoc)) {
1876 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1877 if (err)
1878 goto out_free;
1879 }
1880
1881 /* If an address is passed with the sendto/sendmsg call, it is used
1882 * to override the primary destination address in the TCP model, or
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001883 * when SCTP_ADDR_OVER flag is set in the UDP model.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884 */
1885 if ((sctp_style(sk, TCP) && msg_name) ||
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07001886 (sinfo_flags & SCTP_ADDR_OVER)) {
Al Virodce116a2006-11-20 17:25:15 -08001887 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888 if (!chunk_tp) {
1889 err = -EINVAL;
1890 goto out_free;
1891 }
1892 } else
1893 chunk_tp = NULL;
1894
1895 /* Auto-connect, if we aren't connected already. */
1896 if (sctp_state(asoc, CLOSED)) {
1897 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1898 if (err < 0)
1899 goto out_free;
1900 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1901 }
1902
1903 /* Break the message into multiple chunks of maximum size. */
1904 datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
1905 if (!datamsg) {
1906 err = -ENOMEM;
1907 goto out_free;
1908 }
1909
1910 /* Now send the (possibly) fragmented message. */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07001911 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
Florian Westphal80445cf2008-03-23 22:47:08 -07001912 sctp_chunk_hold(chunk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913
1914 /* Do accounting for the write space. */
1915 sctp_set_owner_w(chunk);
1916
1917 chunk->transport = chunk_tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 }
1919
Vlad Yasevich9c5c62b2009-08-10 13:51:03 -04001920 /* Send it to the lower layers. Note: all chunks
1921 * must either fail or succeed. The lower layer
1922 * works that way today. Keep it that way or this
1923 * breaks.
1924 */
1925 err = sctp_primitive_SEND(asoc, datamsg);
1926 /* Did the lower layer accept the chunk? */
1927 if (err)
1928 sctp_datamsg_free(datamsg);
1929 else
1930 sctp_datamsg_put(datamsg);
1931
1932 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1933
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934 if (err)
1935 goto out_free;
1936 else
1937 err = msg_len;
1938
1939 /* If we are already past ASSOCIATE, the lower
1940 * layers are responsible for association cleanup.
1941 */
1942 goto out_unlock;
1943
1944out_free:
1945 if (new_asoc)
1946 sctp_association_free(asoc);
1947out_unlock:
1948 sctp_release_sock(sk);
1949
1950out_nounlock:
1951 return sctp_error(sk, msg_flags, err);
1952
1953#if 0
1954do_sock_err:
1955 if (msg_len)
1956 err = msg_len;
1957 else
1958 err = sock_error(sk);
1959 goto out;
1960
1961do_interrupted:
1962 if (msg_len)
1963 err = msg_len;
1964 goto out;
1965#endif /* 0 */
1966}
1967
1968/* This is an extended version of skb_pull() that removes the data from the
1969 * start of a skb even when data is spread across the list of skb's in the
1970 * frag_list. len specifies the total amount of data that needs to be removed.
1971 * when 'len' bytes could be removed from the skb, it returns 0.
1972 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1973 * could not be removed.
1974 */
1975static int sctp_skb_pull(struct sk_buff *skb, int len)
1976{
1977 struct sk_buff *list;
1978 int skb_len = skb_headlen(skb);
1979 int rlen;
1980
1981 if (len <= skb_len) {
1982 __skb_pull(skb, len);
1983 return 0;
1984 }
1985 len -= skb_len;
1986 __skb_pull(skb, skb_len);
1987
David S. Miller1b003be2009-06-09 00:22:35 -07001988 skb_walk_frags(skb, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989 rlen = sctp_skb_pull(list, len);
1990 skb->len -= (len-rlen);
1991 skb->data_len -= (len-rlen);
1992
1993 if (!rlen)
1994 return 0;
1995
1996 len = rlen;
1997 }
1998
1999 return len;
2000}
2001
2002/* API 3.1.3 recvmsg() - UDP Style Syntax
2003 *
2004 * ssize_t recvmsg(int socket, struct msghdr *message,
2005 * int flags);
2006 *
2007 * socket - the socket descriptor of the endpoint.
2008 * message - pointer to the msghdr structure which contains a single
2009 * user message and possibly some ancillary data.
2010 *
2011 * See Section 5 for complete description of the data
2012 * structures.
2013 *
2014 * flags - flags sent or received with the user message, see Section
2015 * 5 for complete description of the flags.
2016 */
2017static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
2018
2019SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
2020 struct msghdr *msg, size_t len, int noblock,
2021 int flags, int *addr_len)
2022{
2023 struct sctp_ulpevent *event = NULL;
2024 struct sctp_sock *sp = sctp_sk(sk);
2025 struct sk_buff *skb;
2026 int copied;
2027 int err = 0;
2028 int skb_len;
2029
2030 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
2031 "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
2032 "len", len, "knoblauch", noblock,
2033 "flags", flags, "addr_len", addr_len);
2034
2035 sctp_lock_sock(sk);
2036
2037 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2038 err = -ENOTCONN;
2039 goto out;
2040 }
2041
2042 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2043 if (!skb)
2044 goto out;
2045
2046 /* Get the total length of the skb including any skb's in the
2047 * frag_list.
2048 */
2049 skb_len = skb->len;
2050
2051 copied = skb_len;
2052 if (copied > len)
2053 copied = len;
2054
2055 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2056
2057 event = sctp_skb2event(skb);
2058
2059 if (err)
2060 goto out_free;
2061
Neil Horman3b885782009-10-12 13:26:31 -07002062 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063 if (sctp_ulpevent_is_notification(event)) {
2064 msg->msg_flags |= MSG_NOTIFICATION;
2065 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2066 } else {
2067 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2068 }
2069
2070 /* Check if we allow SCTP_SNDRCVINFO. */
2071 if (sp->subscribe.sctp_data_io_event)
2072 sctp_ulpevent_read_sndrcvinfo(event, msg);
2073#if 0
2074 /* FIXME: we should be calling IP/IPv6 layers. */
2075 if (sk->sk_protinfo.af_inet.cmsg_flags)
2076 ip_cmsg_recv(msg, skb);
2077#endif
2078
2079 err = copied;
2080
2081 /* If skb's length exceeds the user's buffer, update the skb and
2082 * push it back to the receive_queue so that the next call to
2083 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2084 */
2085 if (skb_len > copied) {
2086 msg->msg_flags &= ~MSG_EOR;
2087 if (flags & MSG_PEEK)
2088 goto out_free;
2089 sctp_skb_pull(skb, copied);
2090 skb_queue_head(&sk->sk_receive_queue, skb);
2091
2092 /* When only partial message is copied to the user, increase
2093 * rwnd by that amount. If all the data in the skb is read,
2094 * rwnd is updated when the event is freed.
2095 */
Vlad Yasevich0eca8fe2008-01-11 10:12:56 -05002096 if (!sctp_ulpevent_is_notification(event))
2097 sctp_assoc_rwnd_increase(event->asoc, copied);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098 goto out;
2099 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2100 (event->msg_flags & MSG_EOR))
2101 msg->msg_flags |= MSG_EOR;
2102 else
2103 msg->msg_flags &= ~MSG_EOR;
2104
2105out_free:
2106 if (flags & MSG_PEEK) {
2107 /* Release the skb reference acquired after peeking the skb in
2108 * sctp_skb_recv_datagram().
2109 */
2110 kfree_skb(skb);
2111 } else {
2112 /* Free the event which includes releasing the reference to
2113 * the owner of the skb, freeing the skb and updating the
2114 * rwnd.
2115 */
2116 sctp_ulpevent_free(event);
2117 }
2118out:
2119 sctp_release_sock(sk);
2120 return err;
2121}
2122
2123/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2124 *
2125 * This option is a on/off flag. If enabled no SCTP message
2126 * fragmentation will be performed. Instead if a message being sent
2127 * exceeds the current PMTU size, the message will NOT be sent and
2128 * instead a error will be indicated to the user.
2129 */
2130static int sctp_setsockopt_disable_fragments(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002131 char __user *optval,
2132 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002133{
2134 int val;
2135
2136 if (optlen < sizeof(int))
2137 return -EINVAL;
2138
2139 if (get_user(val, (int __user *)optval))
2140 return -EFAULT;
2141
2142 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2143
2144 return 0;
2145}
2146
2147static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002148 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149{
Wei Yongjun94912302011-07-02 09:28:04 +00002150 struct sctp_association *asoc;
2151 struct sctp_ulpevent *event;
2152
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05002153 if (optlen > sizeof(struct sctp_event_subscribe))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002154 return -EINVAL;
2155 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2156 return -EFAULT;
Wei Yongjun94912302011-07-02 09:28:04 +00002157
2158 /*
2159 * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2160 * if there is no data to be sent or retransmit, the stack will
2161 * immediately send up this notification.
2162 */
2163 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2164 &sctp_sk(sk)->subscribe)) {
2165 asoc = sctp_id2assoc(sk, 0);
2166
2167 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2168 event = sctp_ulpevent_make_sender_dry_event(asoc,
2169 GFP_ATOMIC);
2170 if (!event)
2171 return -ENOMEM;
2172
2173 sctp_ulpq_tail_event(&asoc->ulpq, event);
2174 }
2175 }
2176
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177 return 0;
2178}
2179
2180/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2181 *
2182 * This socket option is applicable to the UDP-style socket only. When
2183 * set it will cause associations that are idle for more than the
2184 * specified number of seconds to automatically close. An association
2185 * being idle is defined an association that has NOT sent or received
2186 * user data. The special value of '0' indicates that no automatic
2187 * close of any associations should be performed. The option expects an
2188 * integer defining the number of seconds of idle time before an
2189 * association is closed.
2190 */
2191static int sctp_setsockopt_autoclose(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{
2194 struct sctp_sock *sp = sctp_sk(sk);
2195
2196 /* Applicable to UDP-style socket only */
2197 if (sctp_style(sk, TCP))
2198 return -EOPNOTSUPP;
2199 if (optlen != sizeof(int))
2200 return -EINVAL;
2201 if (copy_from_user(&sp->autoclose, optval, optlen))
2202 return -EFAULT;
2203
Linus Torvalds1da177e2005-04-16 15:20:36 -07002204 return 0;
2205}
2206
2207/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2208 *
2209 * Applications can enable or disable heartbeats for any peer address of
2210 * an association, modify an address's heartbeat interval, force a
2211 * heartbeat to be sent immediately, and adjust the address's maximum
2212 * number of retransmissions sent before an address is considered
2213 * unreachable. The following structure is used to access and modify an
2214 * address's parameters:
2215 *
2216 * struct sctp_paddrparams {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002217 * sctp_assoc_t spp_assoc_id;
2218 * struct sockaddr_storage spp_address;
2219 * uint32_t spp_hbinterval;
2220 * uint16_t spp_pathmaxrxt;
2221 * uint32_t spp_pathmtu;
2222 * uint32_t spp_sackdelay;
2223 * uint32_t spp_flags;
2224 * };
Linus Torvalds1da177e2005-04-16 15:20:36 -07002225 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08002226 * spp_assoc_id - (one-to-many style socket) This is filled in the
2227 * application, and identifies the association for
2228 * this query.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229 * spp_address - This specifies which address is of interest.
2230 * spp_hbinterval - This contains the value of the heartbeat interval,
Frank Filz52ccb8e2005-12-22 11:36:46 -08002231 * in milliseconds. If a value of zero
2232 * is present in this field then no changes are to
2233 * be made to this parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234 * spp_pathmaxrxt - This contains the maximum number of
2235 * retransmissions before this address shall be
Frank Filz52ccb8e2005-12-22 11:36:46 -08002236 * considered unreachable. If a value of zero
2237 * is present in this field then no changes are to
2238 * be made to this parameter.
2239 * spp_pathmtu - When Path MTU discovery is disabled the value
2240 * specified here will be the "fixed" path mtu.
2241 * Note that if the spp_address field is empty
2242 * then all associations on this address will
2243 * have this fixed path mtu set upon them.
2244 *
2245 * spp_sackdelay - When delayed sack is enabled, this value specifies
2246 * the number of milliseconds that sacks will be delayed
2247 * for. This value will apply to all addresses of an
2248 * association if the spp_address field is empty. Note
2249 * also, that if delayed sack is enabled and this
2250 * value is set to 0, no change is made to the last
2251 * recorded delayed sack timer value.
2252 *
2253 * spp_flags - These flags are used to control various features
2254 * on an association. The flag field may contain
2255 * zero or more of the following options.
2256 *
2257 * SPP_HB_ENABLE - Enable heartbeats on the
2258 * specified address. Note that if the address
2259 * field is empty all addresses for the association
2260 * have heartbeats enabled upon them.
2261 *
2262 * SPP_HB_DISABLE - Disable heartbeats on the
2263 * speicifed address. Note that if the address
2264 * field is empty all addresses for the association
2265 * will have their heartbeats disabled. Note also
2266 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2267 * mutually exclusive, only one of these two should
2268 * be specified. Enabling both fields will have
2269 * undetermined results.
2270 *
2271 * SPP_HB_DEMAND - Request a user initiated heartbeat
2272 * to be made immediately.
2273 *
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002274 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2275 * heartbeat delayis to be set to the value of 0
2276 * milliseconds.
2277 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08002278 * SPP_PMTUD_ENABLE - This field will enable PMTU
2279 * discovery upon the specified address. Note that
2280 * if the address feild is empty then all addresses
2281 * on the association are effected.
2282 *
2283 * SPP_PMTUD_DISABLE - This field will disable PMTU
2284 * discovery upon the specified address. Note that
2285 * if the address feild is empty then all addresses
2286 * on the association are effected. Not also that
2287 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2288 * exclusive. Enabling both will have undetermined
2289 * results.
2290 *
2291 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2292 * on delayed sack. The time specified in spp_sackdelay
2293 * is used to specify the sack delay for this address. Note
2294 * that if spp_address is empty then all addresses will
2295 * enable delayed sack and take on the sack delay
2296 * value specified in spp_sackdelay.
2297 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2298 * off delayed sack. If the spp_address field is blank then
2299 * delayed sack is disabled for the entire association. Note
2300 * also that this field is mutually exclusive to
2301 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2302 * results.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303 */
Adrian Bunk16164362006-09-18 00:40:38 -07002304static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2305 struct sctp_transport *trans,
2306 struct sctp_association *asoc,
2307 struct sctp_sock *sp,
2308 int hb_change,
2309 int pmtud_change,
2310 int sackdelay_change)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002311{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002312 int error;
2313
Frank Filz52ccb8e2005-12-22 11:36:46 -08002314 if (params->spp_flags & SPP_HB_DEMAND && trans) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002315 error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans);
2316 if (error)
2317 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318 }
2319
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002320 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2321 * this field is ignored. Note also that a value of zero indicates
2322 * the current setting should be left unchanged.
2323 */
2324 if (params->spp_flags & SPP_HB_ENABLE) {
2325
2326 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2327 * set. This lets us use 0 value when this flag
2328 * is set.
2329 */
2330 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2331 params->spp_hbinterval = 0;
2332
2333 if (params->spp_hbinterval ||
2334 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2335 if (trans) {
2336 trans->hbinterval =
2337 msecs_to_jiffies(params->spp_hbinterval);
2338 } else if (asoc) {
2339 asoc->hbinterval =
2340 msecs_to_jiffies(params->spp_hbinterval);
2341 } else {
2342 sp->hbinterval = params->spp_hbinterval;
2343 }
Frank Filz52ccb8e2005-12-22 11:36:46 -08002344 }
2345 }
2346
2347 if (hb_change) {
2348 if (trans) {
2349 trans->param_flags =
2350 (trans->param_flags & ~SPP_HB) | hb_change;
2351 } else if (asoc) {
2352 asoc->param_flags =
2353 (asoc->param_flags & ~SPP_HB) | hb_change;
2354 } else {
2355 sp->param_flags =
2356 (sp->param_flags & ~SPP_HB) | hb_change;
2357 }
2358 }
2359
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002360 /* When Path MTU discovery is disabled the value specified here will
2361 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2362 * include the flag SPP_PMTUD_DISABLE for this field to have any
2363 * effect).
2364 */
2365 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002366 if (trans) {
2367 trans->pathmtu = params->spp_pathmtu;
2368 sctp_assoc_sync_pmtu(asoc);
2369 } else if (asoc) {
2370 asoc->pathmtu = params->spp_pathmtu;
Vlad Yasevichf68b2e02009-09-04 18:21:00 -04002371 sctp_frag_point(asoc, params->spp_pathmtu);
Frank Filz52ccb8e2005-12-22 11:36:46 -08002372 } else {
2373 sp->pathmtu = params->spp_pathmtu;
2374 }
2375 }
2376
2377 if (pmtud_change) {
2378 if (trans) {
2379 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2380 (params->spp_flags & SPP_PMTUD_ENABLE);
2381 trans->param_flags =
2382 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2383 if (update) {
Vlad Yasevich9914ae32011-04-26 21:51:31 +00002384 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
Frank Filz52ccb8e2005-12-22 11:36:46 -08002385 sctp_assoc_sync_pmtu(asoc);
2386 }
2387 } else if (asoc) {
2388 asoc->param_flags =
2389 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2390 } else {
2391 sp->param_flags =
2392 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2393 }
2394 }
2395
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002396 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2397 * value of this field is ignored. Note also that a value of zero
2398 * indicates the current setting should be left unchanged.
2399 */
2400 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002401 if (trans) {
2402 trans->sackdelay =
2403 msecs_to_jiffies(params->spp_sackdelay);
2404 } else if (asoc) {
2405 asoc->sackdelay =
2406 msecs_to_jiffies(params->spp_sackdelay);
2407 } else {
2408 sp->sackdelay = params->spp_sackdelay;
2409 }
2410 }
2411
2412 if (sackdelay_change) {
2413 if (trans) {
2414 trans->param_flags =
2415 (trans->param_flags & ~SPP_SACKDELAY) |
2416 sackdelay_change;
2417 } else if (asoc) {
2418 asoc->param_flags =
2419 (asoc->param_flags & ~SPP_SACKDELAY) |
2420 sackdelay_change;
2421 } else {
2422 sp->param_flags =
2423 (sp->param_flags & ~SPP_SACKDELAY) |
2424 sackdelay_change;
2425 }
2426 }
2427
Andrei Pelinescu-Onciul37051f72009-11-23 15:53:57 -05002428 /* Note that a value of zero indicates the current setting should be
2429 left unchanged.
Vlad Yasevichbdf30922007-03-23 11:33:12 -07002430 */
Andrei Pelinescu-Onciul37051f72009-11-23 15:53:57 -05002431 if (params->spp_pathmaxrxt) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002432 if (trans) {
2433 trans->pathmaxrxt = params->spp_pathmaxrxt;
2434 } else if (asoc) {
2435 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2436 } else {
2437 sp->pathmaxrxt = params->spp_pathmaxrxt;
2438 }
2439 }
2440
2441 return 0;
2442}
2443
2444static int sctp_setsockopt_peer_addr_params(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002445 char __user *optval,
2446 unsigned int optlen)
Frank Filz52ccb8e2005-12-22 11:36:46 -08002447{
2448 struct sctp_paddrparams params;
2449 struct sctp_transport *trans = NULL;
2450 struct sctp_association *asoc = NULL;
2451 struct sctp_sock *sp = sctp_sk(sk);
2452 int error;
2453 int hb_change, pmtud_change, sackdelay_change;
2454
2455 if (optlen != sizeof(struct sctp_paddrparams))
2456 return - EINVAL;
2457
2458 if (copy_from_user(&params, optval, optlen))
2459 return -EFAULT;
2460
2461 /* Validate flags and value parameters. */
2462 hb_change = params.spp_flags & SPP_HB;
2463 pmtud_change = params.spp_flags & SPP_PMTUD;
2464 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2465
2466 if (hb_change == SPP_HB ||
2467 pmtud_change == SPP_PMTUD ||
2468 sackdelay_change == SPP_SACKDELAY ||
2469 params.spp_sackdelay > 500 ||
Joe Perchesf64f9e72009-11-29 16:55:45 -08002470 (params.spp_pathmtu &&
2471 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
Frank Filz52ccb8e2005-12-22 11:36:46 -08002472 return -EINVAL;
2473
2474 /* If an address other than INADDR_ANY is specified, and
2475 * no transport is found, then the request is invalid.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002476 */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -04002477 if (!sctp_is_any(sk, ( union sctp_addr *)&params.spp_address)) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002478 trans = sctp_addr_id2transport(sk, &params.spp_address,
2479 params.spp_assoc_id);
2480 if (!trans)
2481 return -EINVAL;
2482 }
2483
2484 /* Get association, if assoc_id != 0 and the socket is a one
2485 * to many style socket, and an association was not found, then
2486 * the id was invalid.
2487 */
2488 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2489 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2490 return -EINVAL;
2491
2492 /* Heartbeat demand can only be sent on a transport or
2493 * association, but not a socket.
2494 */
2495 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2496 return -EINVAL;
2497
2498 /* Process parameters. */
2499 error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2500 hb_change, pmtud_change,
2501 sackdelay_change);
2502
2503 if (error)
2504 return error;
2505
2506 /* If changes are for association, also apply parameters to each
2507 * transport.
2508 */
2509 if (!trans && asoc) {
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002510 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2511 transports) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08002512 sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2513 hb_change, pmtud_change,
2514 sackdelay_change);
2515 }
2516 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002517
2518 return 0;
2519}
2520
Wei Yongjund364d922008-05-09 15:13:26 -07002521/*
2522 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
Frank Filz77086102005-12-22 11:37:30 -08002523 *
Wei Yongjund364d922008-05-09 15:13:26 -07002524 * This option will effect the way delayed acks are performed. This
2525 * option allows you to get or set the delayed ack time, in
2526 * milliseconds. It also allows changing the delayed ack frequency.
2527 * Changing the frequency to 1 disables the delayed sack algorithm. If
2528 * the assoc_id is 0, then this sets or gets the endpoints default
2529 * values. If the assoc_id field is non-zero, then the set or get
2530 * effects the specified association for the one to many model (the
2531 * assoc_id field is ignored by the one to one model). Note that if
2532 * sack_delay or sack_freq are 0 when setting this option, then the
2533 * current values will remain unchanged.
Frank Filz77086102005-12-22 11:37:30 -08002534 *
Wei Yongjund364d922008-05-09 15:13:26 -07002535 * struct sctp_sack_info {
2536 * sctp_assoc_t sack_assoc_id;
2537 * uint32_t sack_delay;
2538 * uint32_t sack_freq;
2539 * };
Frank Filz77086102005-12-22 11:37:30 -08002540 *
Wei Yongjund364d922008-05-09 15:13:26 -07002541 * sack_assoc_id - This parameter, indicates which association the user
2542 * is performing an action upon. Note that if this field's value is
2543 * zero then the endpoints default value is changed (effecting future
2544 * associations only).
Frank Filz77086102005-12-22 11:37:30 -08002545 *
Wei Yongjund364d922008-05-09 15:13:26 -07002546 * sack_delay - This parameter contains the number of milliseconds that
2547 * the user is requesting the delayed ACK timer be set to. Note that
2548 * this value is defined in the standard to be between 200 and 500
2549 * milliseconds.
Frank Filz77086102005-12-22 11:37:30 -08002550 *
Wei Yongjund364d922008-05-09 15:13:26 -07002551 * sack_freq - This parameter contains the number of packets that must
2552 * be received before a sack is sent without waiting for the delay
2553 * timer to expire. The default value for this is 2, setting this
2554 * value to 1 will disable the delayed sack algorithm.
Frank Filz77086102005-12-22 11:37:30 -08002555 */
2556
Wei Yongjund364d922008-05-09 15:13:26 -07002557static int sctp_setsockopt_delayed_ack(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002558 char __user *optval, unsigned int optlen)
Frank Filz77086102005-12-22 11:37:30 -08002559{
Wei Yongjund364d922008-05-09 15:13:26 -07002560 struct sctp_sack_info params;
Frank Filz77086102005-12-22 11:37:30 -08002561 struct sctp_transport *trans = NULL;
2562 struct sctp_association *asoc = NULL;
2563 struct sctp_sock *sp = sctp_sk(sk);
2564
Wei Yongjund364d922008-05-09 15:13:26 -07002565 if (optlen == sizeof(struct sctp_sack_info)) {
2566 if (copy_from_user(&params, optval, optlen))
2567 return -EFAULT;
2568
2569 if (params.sack_delay == 0 && params.sack_freq == 0)
2570 return 0;
2571 } else if (optlen == sizeof(struct sctp_assoc_value)) {
Joe Perches145ce502010-08-24 13:21:08 +00002572 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2573 pr_warn("Use struct sctp_sack_info instead\n");
Wei Yongjund364d922008-05-09 15:13:26 -07002574 if (copy_from_user(&params, optval, optlen))
2575 return -EFAULT;
2576
2577 if (params.sack_delay == 0)
2578 params.sack_freq = 1;
2579 else
2580 params.sack_freq = 0;
2581 } else
Frank Filz77086102005-12-22 11:37:30 -08002582 return - EINVAL;
2583
Frank Filz77086102005-12-22 11:37:30 -08002584 /* Validate value parameter. */
Wei Yongjund364d922008-05-09 15:13:26 -07002585 if (params.sack_delay > 500)
Frank Filz77086102005-12-22 11:37:30 -08002586 return -EINVAL;
2587
Wei Yongjund364d922008-05-09 15:13:26 -07002588 /* Get association, if sack_assoc_id != 0 and the socket is a one
Frank Filz77086102005-12-22 11:37:30 -08002589 * to many style socket, and an association was not found, then
2590 * the id was invalid.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002591 */
Wei Yongjund364d922008-05-09 15:13:26 -07002592 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2593 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
Frank Filz77086102005-12-22 11:37:30 -08002594 return -EINVAL;
2595
Wei Yongjund364d922008-05-09 15:13:26 -07002596 if (params.sack_delay) {
Frank Filz77086102005-12-22 11:37:30 -08002597 if (asoc) {
2598 asoc->sackdelay =
Wei Yongjund364d922008-05-09 15:13:26 -07002599 msecs_to_jiffies(params.sack_delay);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002600 asoc->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002601 (asoc->param_flags & ~SPP_SACKDELAY) |
2602 SPP_SACKDELAY_ENABLE;
2603 } else {
Wei Yongjund364d922008-05-09 15:13:26 -07002604 sp->sackdelay = params.sack_delay;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002605 sp->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002606 (sp->param_flags & ~SPP_SACKDELAY) |
2607 SPP_SACKDELAY_ENABLE;
2608 }
Wei Yongjund364d922008-05-09 15:13:26 -07002609 }
2610
2611 if (params.sack_freq == 1) {
Frank Filz77086102005-12-22 11:37:30 -08002612 if (asoc) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002613 asoc->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002614 (asoc->param_flags & ~SPP_SACKDELAY) |
2615 SPP_SACKDELAY_DISABLE;
2616 } else {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002617 sp->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002618 (sp->param_flags & ~SPP_SACKDELAY) |
2619 SPP_SACKDELAY_DISABLE;
2620 }
Wei Yongjund364d922008-05-09 15:13:26 -07002621 } else if (params.sack_freq > 1) {
2622 if (asoc) {
2623 asoc->sackfreq = params.sack_freq;
2624 asoc->param_flags =
2625 (asoc->param_flags & ~SPP_SACKDELAY) |
2626 SPP_SACKDELAY_ENABLE;
2627 } else {
2628 sp->sackfreq = params.sack_freq;
2629 sp->param_flags =
2630 (sp->param_flags & ~SPP_SACKDELAY) |
2631 SPP_SACKDELAY_ENABLE;
2632 }
Frank Filz77086102005-12-22 11:37:30 -08002633 }
2634
2635 /* If change is for association, also apply to each transport. */
2636 if (asoc) {
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002637 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2638 transports) {
Wei Yongjund364d922008-05-09 15:13:26 -07002639 if (params.sack_delay) {
Frank Filz77086102005-12-22 11:37:30 -08002640 trans->sackdelay =
Wei Yongjund364d922008-05-09 15:13:26 -07002641 msecs_to_jiffies(params.sack_delay);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002642 trans->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002643 (trans->param_flags & ~SPP_SACKDELAY) |
2644 SPP_SACKDELAY_ENABLE;
Wei Yongjund364d922008-05-09 15:13:26 -07002645 }
Vlad Yasevich7bfe8bd2008-06-09 15:45:05 -07002646 if (params.sack_freq == 1) {
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002647 trans->param_flags =
Frank Filz77086102005-12-22 11:37:30 -08002648 (trans->param_flags & ~SPP_SACKDELAY) |
2649 SPP_SACKDELAY_DISABLE;
Wei Yongjund364d922008-05-09 15:13:26 -07002650 } else if (params.sack_freq > 1) {
2651 trans->sackfreq = params.sack_freq;
2652 trans->param_flags =
2653 (trans->param_flags & ~SPP_SACKDELAY) |
2654 SPP_SACKDELAY_ENABLE;
Frank Filz77086102005-12-22 11:37:30 -08002655 }
2656 }
2657 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002658
Frank Filz77086102005-12-22 11:37:30 -08002659 return 0;
2660}
2661
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2663 *
2664 * Applications can specify protocol parameters for the default association
2665 * initialization. The option name argument to setsockopt() and getsockopt()
2666 * is SCTP_INITMSG.
2667 *
2668 * Setting initialization parameters is effective only on an unconnected
2669 * socket (for UDP-style sockets only future associations are effected
2670 * by the change). With TCP-style sockets, this option is inherited by
2671 * sockets derived from a listener socket.
2672 */
David S. Millerb7058842009-09-30 16:12:20 -07002673static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674{
2675 struct sctp_initmsg sinit;
2676 struct sctp_sock *sp = sctp_sk(sk);
2677
2678 if (optlen != sizeof(struct sctp_initmsg))
2679 return -EINVAL;
2680 if (copy_from_user(&sinit, optval, optlen))
2681 return -EFAULT;
2682
2683 if (sinit.sinit_num_ostreams)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002684 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002685 if (sinit.sinit_max_instreams)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002686 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002687 if (sinit.sinit_max_attempts)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002688 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002689 if (sinit.sinit_max_init_timeo)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002690 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002691
2692 return 0;
2693}
2694
2695/*
2696 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2697 *
2698 * Applications that wish to use the sendto() system call may wish to
2699 * specify a default set of parameters that would normally be supplied
2700 * through the inclusion of ancillary data. This socket option allows
2701 * such an application to set the default sctp_sndrcvinfo structure.
2702 * The application that wishes to use this socket option simply passes
2703 * in to this call the sctp_sndrcvinfo structure defined in Section
2704 * 5.2.2) The input parameters accepted by this call include
2705 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2706 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2707 * to this call if the caller is using the UDP model.
2708 */
2709static int sctp_setsockopt_default_send_param(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07002710 char __user *optval,
2711 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002712{
2713 struct sctp_sndrcvinfo info;
2714 struct sctp_association *asoc;
2715 struct sctp_sock *sp = sctp_sk(sk);
2716
2717 if (optlen != sizeof(struct sctp_sndrcvinfo))
2718 return -EINVAL;
2719 if (copy_from_user(&info, optval, optlen))
2720 return -EFAULT;
2721
2722 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2723 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2724 return -EINVAL;
2725
2726 if (asoc) {
2727 asoc->default_stream = info.sinfo_stream;
2728 asoc->default_flags = info.sinfo_flags;
2729 asoc->default_ppid = info.sinfo_ppid;
2730 asoc->default_context = info.sinfo_context;
2731 asoc->default_timetolive = info.sinfo_timetolive;
2732 } else {
2733 sp->default_stream = info.sinfo_stream;
2734 sp->default_flags = info.sinfo_flags;
2735 sp->default_ppid = info.sinfo_ppid;
2736 sp->default_context = info.sinfo_context;
2737 sp->default_timetolive = info.sinfo_timetolive;
2738 }
2739
2740 return 0;
2741}
2742
2743/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2744 *
2745 * Requests that the local SCTP stack use the enclosed peer address as
2746 * the association primary. The enclosed address must be one of the
2747 * association peer's addresses.
2748 */
2749static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002750 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002751{
2752 struct sctp_prim prim;
2753 struct sctp_transport *trans;
2754
2755 if (optlen != sizeof(struct sctp_prim))
2756 return -EINVAL;
2757
2758 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2759 return -EFAULT;
2760
2761 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2762 if (!trans)
2763 return -EINVAL;
2764
2765 sctp_assoc_set_primary(trans->asoc, trans);
2766
2767 return 0;
2768}
2769
2770/*
2771 * 7.1.5 SCTP_NODELAY
2772 *
2773 * Turn on/off any Nagle-like algorithm. This means that packets are
2774 * generally sent as soon as possible and no unnecessary delays are
2775 * introduced, at the cost of more packets in the network. Expects an
2776 * integer boolean flag.
2777 */
2778static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07002779 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002780{
2781 int val;
2782
2783 if (optlen < sizeof(int))
2784 return -EINVAL;
2785 if (get_user(val, (int __user *)optval))
2786 return -EFAULT;
2787
2788 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2789 return 0;
2790}
2791
2792/*
2793 *
2794 * 7.1.1 SCTP_RTOINFO
2795 *
2796 * The protocol parameters used to initialize and bound retransmission
2797 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2798 * and modify these parameters.
2799 * All parameters are time values, in milliseconds. A value of 0, when
2800 * modifying the parameters, indicates that the current value should not
2801 * be changed.
2802 *
2803 */
David S. Millerb7058842009-09-30 16:12:20 -07002804static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2805{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002806 struct sctp_rtoinfo rtoinfo;
2807 struct sctp_association *asoc;
2808
2809 if (optlen != sizeof (struct sctp_rtoinfo))
2810 return -EINVAL;
2811
2812 if (copy_from_user(&rtoinfo, optval, optlen))
2813 return -EFAULT;
2814
2815 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2816
2817 /* Set the values to the specific association */
2818 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2819 return -EINVAL;
2820
2821 if (asoc) {
2822 if (rtoinfo.srto_initial != 0)
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09002823 asoc->rto_initial =
Linus Torvalds1da177e2005-04-16 15:20:36 -07002824 msecs_to_jiffies(rtoinfo.srto_initial);
2825 if (rtoinfo.srto_max != 0)
2826 asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2827 if (rtoinfo.srto_min != 0)
2828 asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2829 } else {
2830 /* If there is no association or the association-id = 0
2831 * set the values to the endpoint.
2832 */
2833 struct sctp_sock *sp = sctp_sk(sk);
2834
2835 if (rtoinfo.srto_initial != 0)
2836 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2837 if (rtoinfo.srto_max != 0)
2838 sp->rtoinfo.srto_max = rtoinfo.srto_max;
2839 if (rtoinfo.srto_min != 0)
2840 sp->rtoinfo.srto_min = rtoinfo.srto_min;
2841 }
2842
2843 return 0;
2844}
2845
2846/*
2847 *
2848 * 7.1.2 SCTP_ASSOCINFO
2849 *
Michael Opdenacker59c51592007-05-09 08:57:56 +02002850 * This option is used to tune the maximum retransmission attempts
Linus Torvalds1da177e2005-04-16 15:20:36 -07002851 * of the association.
2852 * Returns an error if the new association retransmission value is
2853 * greater than the sum of the retransmission value of the peer.
2854 * See [SCTP] for more information.
2855 *
2856 */
David S. Millerb7058842009-09-30 16:12:20 -07002857static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002858{
2859
2860 struct sctp_assocparams assocparams;
2861 struct sctp_association *asoc;
2862
2863 if (optlen != sizeof(struct sctp_assocparams))
2864 return -EINVAL;
2865 if (copy_from_user(&assocparams, optval, optlen))
2866 return -EFAULT;
2867
2868 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2869
2870 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2871 return -EINVAL;
2872
2873 /* Set the values to the specific association */
2874 if (asoc) {
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002875 if (assocparams.sasoc_asocmaxrxt != 0) {
2876 __u32 path_sum = 0;
2877 int paths = 0;
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002878 struct sctp_transport *peer_addr;
2879
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07002880 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2881 transports) {
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002882 path_sum += peer_addr->pathmaxrxt;
2883 paths++;
2884 }
2885
Frederik Schwarzer025dfda2008-10-16 19:02:37 +02002886 /* Only validate asocmaxrxt if we have more than
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002887 * one path/transport. We do this because path
2888 * retransmissions are only counted when we have more
2889 * then one path.
2890 */
2891 if (paths > 1 &&
2892 assocparams.sasoc_asocmaxrxt > path_sum)
2893 return -EINVAL;
2894
Linus Torvalds1da177e2005-04-16 15:20:36 -07002895 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
Vlad Yasevich402d68c2006-06-17 22:54:51 -07002896 }
2897
Linus Torvalds1da177e2005-04-16 15:20:36 -07002898 if (assocparams.sasoc_cookie_life != 0) {
2899 asoc->cookie_life.tv_sec =
2900 assocparams.sasoc_cookie_life / 1000;
2901 asoc->cookie_life.tv_usec =
2902 (assocparams.sasoc_cookie_life % 1000)
2903 * 1000;
2904 }
2905 } else {
2906 /* Set the values to the endpoint */
2907 struct sctp_sock *sp = sctp_sk(sk);
2908
2909 if (assocparams.sasoc_asocmaxrxt != 0)
2910 sp->assocparams.sasoc_asocmaxrxt =
2911 assocparams.sasoc_asocmaxrxt;
2912 if (assocparams.sasoc_cookie_life != 0)
2913 sp->assocparams.sasoc_cookie_life =
2914 assocparams.sasoc_cookie_life;
2915 }
2916 return 0;
2917}
2918
2919/*
2920 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2921 *
2922 * This socket option is a boolean flag which turns on or off mapped V4
2923 * addresses. If this option is turned on and the socket is type
2924 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2925 * If this option is turned off, then no mapping will be done of V4
2926 * addresses and a user will receive both PF_INET6 and PF_INET type
2927 * addresses on the socket.
2928 */
David S. Millerb7058842009-09-30 16:12:20 -07002929static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002930{
2931 int val;
2932 struct sctp_sock *sp = sctp_sk(sk);
2933
2934 if (optlen < sizeof(int))
2935 return -EINVAL;
2936 if (get_user(val, (int __user *)optval))
2937 return -EFAULT;
2938 if (val)
2939 sp->v4mapped = 1;
2940 else
2941 sp->v4mapped = 0;
2942
2943 return 0;
2944}
2945
2946/*
Wei Yongjune89c2092008-12-25 16:54:58 -08002947 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2948 * This option will get or set the maximum size to put in any outgoing
2949 * SCTP DATA chunk. If a message is larger than this size it will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07002950 * fragmented by SCTP into the specified size. Note that the underlying
2951 * SCTP implementation may fragment into smaller sized chunks when the
2952 * PMTU of the underlying association is smaller than the value set by
Wei Yongjune89c2092008-12-25 16:54:58 -08002953 * the user. The default value for this option is '0' which indicates
2954 * the user is NOT limiting fragmentation and only the PMTU will effect
2955 * SCTP's choice of DATA chunk size. Note also that values set larger
2956 * than the maximum size of an IP datagram will effectively let SCTP
2957 * control fragmentation (i.e. the same as setting this option to 0).
2958 *
2959 * The following structure is used to access and modify this parameter:
2960 *
2961 * struct sctp_assoc_value {
2962 * sctp_assoc_t assoc_id;
2963 * uint32_t assoc_value;
2964 * };
2965 *
2966 * assoc_id: This parameter is ignored for one-to-one style sockets.
2967 * For one-to-many style sockets this parameter indicates which
2968 * association the user is performing an action upon. Note that if
2969 * this field's value is zero then the endpoints default value is
2970 * changed (effecting future associations only).
2971 * assoc_value: This parameter specifies the maximum size in bytes.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002972 */
David S. Millerb7058842009-09-30 16:12:20 -07002973static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002974{
Wei Yongjune89c2092008-12-25 16:54:58 -08002975 struct sctp_assoc_value params;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002976 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002977 struct sctp_sock *sp = sctp_sk(sk);
2978 int val;
2979
Wei Yongjune89c2092008-12-25 16:54:58 -08002980 if (optlen == sizeof(int)) {
Joe Perches145ce502010-08-24 13:21:08 +00002981 pr_warn("Use of int in maxseg socket option deprecated\n");
2982 pr_warn("Use struct sctp_assoc_value instead\n");
Wei Yongjune89c2092008-12-25 16:54:58 -08002983 if (copy_from_user(&val, optval, optlen))
2984 return -EFAULT;
2985 params.assoc_id = 0;
2986 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2987 if (copy_from_user(&params, optval, optlen))
2988 return -EFAULT;
2989 val = params.assoc_value;
2990 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002991 return -EINVAL;
Wei Yongjune89c2092008-12-25 16:54:58 -08002992
Ivan Skytte Jorgensen96a33992005-10-28 15:36:12 -07002993 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002994 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002995
Wei Yongjune89c2092008-12-25 16:54:58 -08002996 asoc = sctp_id2assoc(sk, params.assoc_id);
2997 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
2998 return -EINVAL;
2999
3000 if (asoc) {
3001 if (val == 0) {
3002 val = asoc->pathmtu;
3003 val -= sp->pf->af->net_header_len;
3004 val -= sizeof(struct sctphdr) +
3005 sizeof(struct sctp_data_chunk);
3006 }
Vlad Yasevichf68b2e02009-09-04 18:21:00 -04003007 asoc->user_frag = val;
3008 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
Wei Yongjune89c2092008-12-25 16:54:58 -08003009 } else {
3010 sp->user_frag = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003011 }
3012
3013 return 0;
3014}
3015
3016
3017/*
3018 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3019 *
3020 * Requests that the peer mark the enclosed address as the association
3021 * primary. The enclosed address must be one of the association's
3022 * locally bound addresses. The following structure is used to make a
3023 * set primary request:
3024 */
3025static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003026 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003027{
3028 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003029 struct sctp_association *asoc = NULL;
3030 struct sctp_setpeerprim prim;
3031 struct sctp_chunk *chunk;
Wei Yongjun40a01032010-12-07 17:11:09 +00003032 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003033 int err;
3034
3035 sp = sctp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003036
3037 if (!sctp_addip_enable)
3038 return -EPERM;
3039
3040 if (optlen != sizeof(struct sctp_setpeerprim))
3041 return -EINVAL;
3042
3043 if (copy_from_user(&prim, optval, optlen))
3044 return -EFAULT;
3045
3046 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003047 if (!asoc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003048 return -EINVAL;
3049
3050 if (!asoc->peer.asconf_capable)
3051 return -EPERM;
3052
3053 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3054 return -EPERM;
3055
3056 if (!sctp_state(asoc, ESTABLISHED))
3057 return -ENOTCONN;
3058
Wei Yongjun40a01032010-12-07 17:11:09 +00003059 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3060 if (!af)
3061 return -EINVAL;
3062
3063 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3064 return -EADDRNOTAVAIL;
3065
Linus Torvalds1da177e2005-04-16 15:20:36 -07003066 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3067 return -EADDRNOTAVAIL;
3068
3069 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3070 chunk = sctp_make_asconf_set_prim(asoc,
3071 (union sctp_addr *)&prim.sspp_addr);
3072 if (!chunk)
3073 return -ENOMEM;
3074
3075 err = sctp_send_asconf(asoc, chunk);
3076
3077 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
3078
3079 return err;
3080}
3081
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003082static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003083 unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003084{
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003085 struct sctp_setadaptation adaptation;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003086
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003087 if (optlen != sizeof(struct sctp_setadaptation))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003088 return -EINVAL;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003089 if (copy_from_user(&adaptation, optval, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003090 return -EFAULT;
3091
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003092 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003093
3094 return 0;
3095}
3096
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003097/*
3098 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3099 *
3100 * The context field in the sctp_sndrcvinfo structure is normally only
3101 * used when a failed message is retrieved holding the value that was
3102 * sent down on the actual send call. This option allows the setting of
3103 * a default context on an association basis that will be received on
3104 * reading messages from the peer. This is especially helpful in the
3105 * one-2-many model for an application to keep some reference to an
3106 * internal state machine that is processing messages on the
3107 * association. Note that the setting of this value only effects
3108 * received messages from the peer and does not effect the value that is
3109 * saved with outbound messages.
3110 */
3111static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003112 unsigned int optlen)
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003113{
3114 struct sctp_assoc_value params;
3115 struct sctp_sock *sp;
3116 struct sctp_association *asoc;
3117
3118 if (optlen != sizeof(struct sctp_assoc_value))
3119 return -EINVAL;
3120 if (copy_from_user(&params, optval, optlen))
3121 return -EFAULT;
3122
3123 sp = sctp_sk(sk);
3124
3125 if (params.assoc_id != 0) {
3126 asoc = sctp_id2assoc(sk, params.assoc_id);
3127 if (!asoc)
3128 return -EINVAL;
3129 asoc->default_rcv_context = params.assoc_value;
3130 } else {
3131 sp->default_rcv_context = params.assoc_value;
3132 }
3133
3134 return 0;
3135}
3136
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003137/*
3138 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3139 *
3140 * This options will at a minimum specify if the implementation is doing
3141 * fragmented interleave. Fragmented interleave, for a one to many
3142 * socket, is when subsequent calls to receive a message may return
3143 * parts of messages from different associations. Some implementations
3144 * may allow you to turn this value on or off. If so, when turned off,
3145 * no fragment interleave will occur (which will cause a head of line
3146 * blocking amongst multiple associations sharing the same one to many
3147 * socket). When this option is turned on, then each receive call may
3148 * come from a different association (thus the user must receive data
3149 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3150 * association each receive belongs to.
3151 *
3152 * This option takes a boolean value. A non-zero value indicates that
3153 * fragmented interleave is on. A value of zero indicates that
3154 * fragmented interleave is off.
3155 *
3156 * Note that it is important that an implementation that allows this
3157 * option to be turned on, have it off by default. Otherwise an unaware
3158 * application using the one to many model may become confused and act
3159 * incorrectly.
3160 */
3161static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3162 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003163 unsigned int optlen)
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003164{
3165 int val;
3166
3167 if (optlen != sizeof(int))
3168 return -EINVAL;
3169 if (get_user(val, (int __user *)optval))
3170 return -EFAULT;
3171
3172 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3173
3174 return 0;
3175}
3176
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003177/*
Wei Yongjun8510b932008-12-25 16:59:03 -08003178 * 8.1.21. Set or Get the SCTP Partial Delivery Point
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003179 * (SCTP_PARTIAL_DELIVERY_POINT)
Wei Yongjun8510b932008-12-25 16:59:03 -08003180 *
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003181 * This option will set or get the SCTP partial delivery point. This
3182 * point is the size of a message where the partial delivery API will be
3183 * invoked to help free up rwnd space for the peer. Setting this to a
Wei Yongjun8510b932008-12-25 16:59:03 -08003184 * lower value will cause partial deliveries to happen more often. The
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003185 * calls argument is an integer that sets or gets the partial delivery
Wei Yongjun8510b932008-12-25 16:59:03 -08003186 * point. Note also that the call will fail if the user attempts to set
3187 * this value larger than the socket receive buffer size.
3188 *
3189 * Note that any single message having a length smaller than or equal to
3190 * the SCTP partial delivery point will be delivered in one single read
3191 * call as long as the user provided buffer is large enough to hold the
3192 * message.
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003193 */
3194static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3195 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003196 unsigned int optlen)
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003197{
3198 u32 val;
3199
3200 if (optlen != sizeof(u32))
3201 return -EINVAL;
3202 if (get_user(val, (int __user *)optval))
3203 return -EFAULT;
3204
Wei Yongjun8510b932008-12-25 16:59:03 -08003205 /* Note: We double the receive buffer from what the user sets
3206 * it to be, also initial rwnd is based on rcvbuf/2.
3207 */
3208 if (val > (sk->sk_rcvbuf >> 1))
3209 return -EINVAL;
3210
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003211 sctp_sk(sk)->pd_point = val;
3212
3213 return 0; /* is this the right error code? */
3214}
3215
Vlad Yasevich70331572007-03-23 11:34:36 -07003216/*
3217 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3218 *
3219 * This option will allow a user to change the maximum burst of packets
3220 * that can be emitted by this association. Note that the default value
3221 * is 4, and some implementations may restrict this setting so that it
3222 * can only be lowered.
3223 *
3224 * NOTE: This text doesn't seem right. Do this on a socket basis with
3225 * future associations inheriting the socket value.
3226 */
3227static int sctp_setsockopt_maxburst(struct sock *sk,
3228 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003229 unsigned int optlen)
Vlad Yasevich70331572007-03-23 11:34:36 -07003230{
Neil Horman219b99a2008-03-05 13:44:46 -08003231 struct sctp_assoc_value params;
3232 struct sctp_sock *sp;
3233 struct sctp_association *asoc;
Vlad Yasevich70331572007-03-23 11:34:36 -07003234 int val;
Neil Horman219b99a2008-03-05 13:44:46 -08003235 int assoc_id = 0;
Vlad Yasevich70331572007-03-23 11:34:36 -07003236
Neil Horman219b99a2008-03-05 13:44:46 -08003237 if (optlen == sizeof(int)) {
Joe Perches145ce502010-08-24 13:21:08 +00003238 pr_warn("Use of int in max_burst socket option deprecated\n");
3239 pr_warn("Use struct sctp_assoc_value instead\n");
Neil Horman219b99a2008-03-05 13:44:46 -08003240 if (copy_from_user(&val, optval, optlen))
3241 return -EFAULT;
3242 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3243 if (copy_from_user(&params, optval, optlen))
3244 return -EFAULT;
3245 val = params.assoc_value;
3246 assoc_id = params.assoc_id;
3247 } else
3248 return -EINVAL;
3249
3250 sp = sctp_sk(sk);
3251
3252 if (assoc_id != 0) {
3253 asoc = sctp_id2assoc(sk, assoc_id);
3254 if (!asoc)
3255 return -EINVAL;
3256 asoc->max_burst = val;
3257 } else
3258 sp->max_burst = val;
Vlad Yasevich70331572007-03-23 11:34:36 -07003259
3260 return 0;
3261}
3262
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003263/*
3264 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3265 *
3266 * This set option adds a chunk type that the user is requesting to be
3267 * received only in an authenticated way. Changes to the list of chunks
3268 * will only effect future associations on the socket.
3269 */
3270static int sctp_setsockopt_auth_chunk(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003271 char __user *optval,
3272 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003273{
3274 struct sctp_authchunk val;
3275
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003276 if (!sctp_auth_enable)
3277 return -EACCES;
3278
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003279 if (optlen != sizeof(struct sctp_authchunk))
3280 return -EINVAL;
3281 if (copy_from_user(&val, optval, optlen))
3282 return -EFAULT;
3283
3284 switch (val.sauth_chunk) {
Joe Perches7fd71b12011-07-01 09:43:11 +00003285 case SCTP_CID_INIT:
3286 case SCTP_CID_INIT_ACK:
3287 case SCTP_CID_SHUTDOWN_COMPLETE:
3288 case SCTP_CID_AUTH:
3289 return -EINVAL;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003290 }
3291
3292 /* add this chunk id to the endpoint */
3293 return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk);
3294}
3295
3296/*
3297 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3298 *
3299 * This option gets or sets the list of HMAC algorithms that the local
3300 * endpoint requires the peer to use.
3301 */
3302static int sctp_setsockopt_hmac_ident(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003303 char __user *optval,
3304 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003305{
3306 struct sctp_hmacalgo *hmacs;
Vlad Yasevichd9724052008-08-27 16:09:49 -07003307 u32 idents;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003308 int err;
3309
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003310 if (!sctp_auth_enable)
3311 return -EACCES;
3312
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003313 if (optlen < sizeof(struct sctp_hmacalgo))
3314 return -EINVAL;
3315
Shan Wei934253a2011-04-18 19:13:18 +00003316 hmacs= memdup_user(optval, optlen);
3317 if (IS_ERR(hmacs))
3318 return PTR_ERR(hmacs);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003319
Vlad Yasevichd9724052008-08-27 16:09:49 -07003320 idents = hmacs->shmac_num_idents;
3321 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3322 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003323 err = -EINVAL;
3324 goto out;
3325 }
3326
3327 err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs);
3328out:
3329 kfree(hmacs);
3330 return err;
3331}
3332
3333/*
3334 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3335 *
3336 * This option will set a shared secret key which is used to build an
3337 * association shared key.
3338 */
3339static int sctp_setsockopt_auth_key(struct sock *sk,
3340 char __user *optval,
David S. Millerb7058842009-09-30 16:12:20 -07003341 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003342{
3343 struct sctp_authkey *authkey;
3344 struct sctp_association *asoc;
3345 int ret;
3346
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003347 if (!sctp_auth_enable)
3348 return -EACCES;
3349
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003350 if (optlen <= sizeof(struct sctp_authkey))
3351 return -EINVAL;
3352
Shan Wei934253a2011-04-18 19:13:18 +00003353 authkey= memdup_user(optval, optlen);
3354 if (IS_ERR(authkey))
3355 return PTR_ERR(authkey);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003356
Vlad Yasevich328fc472008-08-27 16:08:54 -07003357 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
Vlad Yasevich30c22352008-08-25 15:16:19 -07003358 ret = -EINVAL;
3359 goto out;
3360 }
3361
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003362 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3363 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3364 ret = -EINVAL;
3365 goto out;
3366 }
3367
3368 ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
3369out:
3370 kfree(authkey);
3371 return ret;
3372}
3373
3374/*
3375 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3376 *
3377 * This option will get or set the active shared key to be used to build
3378 * the association shared key.
3379 */
3380static int sctp_setsockopt_active_key(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003381 char __user *optval,
3382 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003383{
3384 struct sctp_authkeyid val;
3385 struct sctp_association *asoc;
3386
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003387 if (!sctp_auth_enable)
3388 return -EACCES;
3389
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003390 if (optlen != sizeof(struct sctp_authkeyid))
3391 return -EINVAL;
3392 if (copy_from_user(&val, optval, optlen))
3393 return -EFAULT;
3394
3395 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3396 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3397 return -EINVAL;
3398
3399 return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc,
3400 val.scact_keynumber);
3401}
3402
3403/*
3404 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3405 *
3406 * This set option will delete a shared secret key from use.
3407 */
3408static int sctp_setsockopt_del_key(struct sock *sk,
David S. Millerb7058842009-09-30 16:12:20 -07003409 char __user *optval,
3410 unsigned int optlen)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003411{
3412 struct sctp_authkeyid val;
3413 struct sctp_association *asoc;
3414
Vlad Yasevich5e739d12008-08-21 03:34:25 -07003415 if (!sctp_auth_enable)
3416 return -EACCES;
3417
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003418 if (optlen != sizeof(struct sctp_authkeyid))
3419 return -EINVAL;
3420 if (copy_from_user(&val, optval, optlen))
3421 return -EFAULT;
3422
3423 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3424 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3425 return -EINVAL;
3426
3427 return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc,
3428 val.scact_keynumber);
3429
3430}
3431
Michio Honda7dc04d72011-04-26 20:16:31 +09003432/*
3433 * 8.1.23 SCTP_AUTO_ASCONF
3434 *
3435 * This option will enable or disable the use of the automatic generation of
3436 * ASCONF chunks to add and delete addresses to an existing association. Note
3437 * that this option has two caveats namely: a) it only affects sockets that
3438 * are bound to all addresses available to the SCTP stack, and b) the system
3439 * administrator may have an overriding control that turns the ASCONF feature
3440 * off no matter what setting the socket option may have.
3441 * This option expects an integer boolean flag, where a non-zero value turns on
3442 * the option, and a zero value turns off the option.
3443 * Note. In this implementation, socket operation overrides default parameter
3444 * being set by sysctl as well as FreeBSD implementation
3445 */
3446static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3447 unsigned int optlen)
3448{
3449 int val;
3450 struct sctp_sock *sp = sctp_sk(sk);
3451
3452 if (optlen < sizeof(int))
3453 return -EINVAL;
3454 if (get_user(val, (int __user *)optval))
3455 return -EFAULT;
3456 if (!sctp_is_ep_boundall(sk) && val)
3457 return -EINVAL;
3458 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3459 return 0;
3460
3461 if (val == 0 && sp->do_auto_asconf) {
3462 list_del(&sp->auto_asconf_list);
3463 sp->do_auto_asconf = 0;
3464 } else if (val && !sp->do_auto_asconf) {
3465 list_add_tail(&sp->auto_asconf_list,
3466 &sctp_auto_asconf_splist);
3467 sp->do_auto_asconf = 1;
3468 }
3469 return 0;
3470}
3471
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003472
Linus Torvalds1da177e2005-04-16 15:20:36 -07003473/* API 6.2 setsockopt(), getsockopt()
3474 *
3475 * Applications use setsockopt() and getsockopt() to set or retrieve
3476 * socket options. Socket options are used to change the default
3477 * behavior of sockets calls. They are described in Section 7.
3478 *
3479 * The syntax is:
3480 *
3481 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3482 * int __user *optlen);
3483 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3484 * int optlen);
3485 *
3486 * sd - the socket descript.
3487 * level - set to IPPROTO_SCTP for all SCTP options.
3488 * optname - the option name.
3489 * optval - the buffer to store the value of the option.
3490 * optlen - the size of the buffer.
3491 */
3492SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003493 char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003494{
3495 int retval = 0;
3496
3497 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3498 sk, optname);
3499
3500 /* I can hardly begin to describe how wrong this is. This is
3501 * so broken as to be worse than useless. The API draft
3502 * REALLY is NOT helpful here... I am not convinced that the
3503 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3504 * are at all well-founded.
3505 */
3506 if (level != SOL_SCTP) {
3507 struct sctp_af *af = sctp_sk(sk)->pf->af;
3508 retval = af->setsockopt(sk, level, optname, optval, optlen);
3509 goto out_nounlock;
3510 }
3511
3512 sctp_lock_sock(sk);
3513
3514 switch (optname) {
3515 case SCTP_SOCKOPT_BINDX_ADD:
3516 /* 'optlen' is the size of the addresses buffer. */
3517 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3518 optlen, SCTP_BINDX_ADD_ADDR);
3519 break;
3520
3521 case SCTP_SOCKOPT_BINDX_REM:
3522 /* 'optlen' is the size of the addresses buffer. */
3523 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3524 optlen, SCTP_BINDX_REM_ADDR);
3525 break;
3526
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003527 case SCTP_SOCKOPT_CONNECTX_OLD:
3528 /* 'optlen' is the size of the addresses buffer. */
3529 retval = sctp_setsockopt_connectx_old(sk,
3530 (struct sockaddr __user *)optval,
3531 optlen);
3532 break;
3533
Frank Filz3f7a87d2005-06-20 13:14:57 -07003534 case SCTP_SOCKOPT_CONNECTX:
3535 /* 'optlen' is the size of the addresses buffer. */
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003536 retval = sctp_setsockopt_connectx(sk,
3537 (struct sockaddr __user *)optval,
3538 optlen);
Frank Filz3f7a87d2005-06-20 13:14:57 -07003539 break;
3540
Linus Torvalds1da177e2005-04-16 15:20:36 -07003541 case SCTP_DISABLE_FRAGMENTS:
3542 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3543 break;
3544
3545 case SCTP_EVENTS:
3546 retval = sctp_setsockopt_events(sk, optval, optlen);
3547 break;
3548
3549 case SCTP_AUTOCLOSE:
3550 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3551 break;
3552
3553 case SCTP_PEER_ADDR_PARAMS:
3554 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3555 break;
3556
Shan Wei4580ccc2011-01-18 22:39:00 +00003557 case SCTP_DELAYED_SACK:
Wei Yongjund364d922008-05-09 15:13:26 -07003558 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
Frank Filz77086102005-12-22 11:37:30 -08003559 break;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07003560 case SCTP_PARTIAL_DELIVERY_POINT:
3561 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3562 break;
Frank Filz77086102005-12-22 11:37:30 -08003563
Linus Torvalds1da177e2005-04-16 15:20:36 -07003564 case SCTP_INITMSG:
3565 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3566 break;
3567 case SCTP_DEFAULT_SEND_PARAM:
3568 retval = sctp_setsockopt_default_send_param(sk, optval,
3569 optlen);
3570 break;
3571 case SCTP_PRIMARY_ADDR:
3572 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3573 break;
3574 case SCTP_SET_PEER_PRIMARY_ADDR:
3575 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3576 break;
3577 case SCTP_NODELAY:
3578 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3579 break;
3580 case SCTP_RTOINFO:
3581 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3582 break;
3583 case SCTP_ASSOCINFO:
3584 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3585 break;
3586 case SCTP_I_WANT_MAPPED_V4_ADDR:
3587 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3588 break;
3589 case SCTP_MAXSEG:
3590 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3591 break;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003592 case SCTP_ADAPTATION_LAYER:
3593 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003594 break;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003595 case SCTP_CONTEXT:
3596 retval = sctp_setsockopt_context(sk, optval, optlen);
3597 break;
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003598 case SCTP_FRAGMENT_INTERLEAVE:
3599 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3600 break;
Vlad Yasevich70331572007-03-23 11:34:36 -07003601 case SCTP_MAX_BURST:
3602 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3603 break;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07003604 case SCTP_AUTH_CHUNK:
3605 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3606 break;
3607 case SCTP_HMAC_IDENT:
3608 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3609 break;
3610 case SCTP_AUTH_KEY:
3611 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3612 break;
3613 case SCTP_AUTH_ACTIVE_KEY:
3614 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3615 break;
3616 case SCTP_AUTH_DELETE_KEY:
3617 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3618 break;
Michio Honda7dc04d72011-04-26 20:16:31 +09003619 case SCTP_AUTO_ASCONF:
3620 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3621 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003622 default:
3623 retval = -ENOPROTOOPT;
3624 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07003625 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003626
3627 sctp_release_sock(sk);
3628
3629out_nounlock:
3630 return retval;
3631}
3632
3633/* API 3.1.6 connect() - UDP Style Syntax
3634 *
3635 * An application may use the connect() call in the UDP model to initiate an
3636 * association without sending data.
3637 *
3638 * The syntax is:
3639 *
3640 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3641 *
3642 * sd: the socket descriptor to have a new association added to.
3643 *
3644 * nam: the address structure (either struct sockaddr_in or struct
3645 * sockaddr_in6 defined in RFC2553 [7]).
3646 *
3647 * len: the size of the address.
3648 */
Frank Filz3f7a87d2005-06-20 13:14:57 -07003649SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003650 int addr_len)
3651{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003652 int err = 0;
Frank Filz3f7a87d2005-06-20 13:14:57 -07003653 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003654
3655 sctp_lock_sock(sk);
3656
Frank Filz3f7a87d2005-06-20 13:14:57 -07003657 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -08003658 __func__, sk, addr, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003659
Frank Filz3f7a87d2005-06-20 13:14:57 -07003660 /* Validate addr_len before calling common connect/connectx routine. */
3661 af = sctp_get_af_specific(addr->sa_family);
3662 if (!af || addr_len < af->sockaddr_len) {
3663 err = -EINVAL;
3664 } else {
3665 /* Pass correct addr len to common routine (so it knows there
3666 * is only one address being passed.
3667 */
Vlad Yasevich88a0a942008-05-09 15:14:11 -07003668 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003669 }
3670
Linus Torvalds1da177e2005-04-16 15:20:36 -07003671 sctp_release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003672 return err;
3673}
3674
3675/* FIXME: Write comments. */
3676SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
3677{
3678 return -EOPNOTSUPP; /* STUB */
3679}
3680
3681/* 4.1.4 accept() - TCP Style Syntax
3682 *
3683 * Applications use accept() call to remove an established SCTP
3684 * association from the accept queue of the endpoint. A new socket
3685 * descriptor will be returned from accept() to represent the newly
3686 * formed association.
3687 */
3688SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3689{
3690 struct sctp_sock *sp;
3691 struct sctp_endpoint *ep;
3692 struct sock *newsk = NULL;
3693 struct sctp_association *asoc;
3694 long timeo;
3695 int error = 0;
3696
3697 sctp_lock_sock(sk);
3698
3699 sp = sctp_sk(sk);
3700 ep = sp->ep;
3701
3702 if (!sctp_style(sk, TCP)) {
3703 error = -EOPNOTSUPP;
3704 goto out;
3705 }
3706
3707 if (!sctp_sstate(sk, LISTENING)) {
3708 error = -EINVAL;
3709 goto out;
3710 }
3711
Sridhar Samudrala8abfedd2006-08-22 00:24:09 -07003712 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003713
3714 error = sctp_wait_for_accept(sk, timeo);
3715 if (error)
3716 goto out;
3717
3718 /* We treat the list of associations on the endpoint as the accept
3719 * queue and pick the first association on the list.
3720 */
3721 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3722
3723 newsk = sp->pf->create_accept_sk(sk, asoc);
3724 if (!newsk) {
3725 error = -ENOMEM;
3726 goto out;
3727 }
3728
3729 /* Populate the fields of the newsk from the oldsk and migrate the
3730 * asoc to the newsk.
3731 */
3732 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3733
3734out:
3735 sctp_release_sock(sk);
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003736 *err = error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003737 return newsk;
3738}
3739
3740/* The SCTP ioctl handler. */
3741SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3742{
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003743 int rc = -ENOTCONN;
3744
3745 sctp_lock_sock(sk);
3746
3747 /*
3748 * SEQPACKET-style sockets in LISTENING state are valid, for
3749 * SCTP, so only discard TCP-style sockets in LISTENING state.
3750 */
3751 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3752 goto out;
3753
3754 switch (cmd) {
3755 case SIOCINQ: {
3756 struct sk_buff *skb;
3757 unsigned int amount = 0;
3758
3759 skb = skb_peek(&sk->sk_receive_queue);
3760 if (skb != NULL) {
3761 /*
3762 * We will only return the amount of this packet since
3763 * that is all that will be read.
3764 */
3765 amount = skb->len;
3766 }
3767 rc = put_user(amount, (int __user *)arg);
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003768 break;
David S. Miller9a7241c2010-10-03 22:14:37 -07003769 }
Diego Elio 'Flameeyes' Pettenò65040c32010-09-03 03:47:03 +00003770 default:
3771 rc = -ENOIOCTLCMD;
3772 break;
3773 }
3774out:
3775 sctp_release_sock(sk);
3776 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003777}
3778
3779/* This is the function which gets called during socket creation to
3780 * initialized the SCTP-specific portion of the sock.
3781 * The sock structure should already be zero-filled memory.
3782 */
3783SCTP_STATIC int sctp_init_sock(struct sock *sk)
3784{
3785 struct sctp_endpoint *ep;
3786 struct sctp_sock *sp;
3787
3788 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
3789
3790 sp = sctp_sk(sk);
3791
3792 /* Initialize the SCTP per socket area. */
3793 switch (sk->sk_type) {
3794 case SOCK_SEQPACKET:
3795 sp->type = SCTP_SOCKET_UDP;
3796 break;
3797 case SOCK_STREAM:
3798 sp->type = SCTP_SOCKET_TCP;
3799 break;
3800 default:
3801 return -ESOCKTNOSUPPORT;
3802 }
3803
3804 /* Initialize default send parameters. These parameters can be
3805 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3806 */
3807 sp->default_stream = 0;
3808 sp->default_ppid = 0;
3809 sp->default_flags = 0;
3810 sp->default_context = 0;
3811 sp->default_timetolive = 0;
3812
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003813 sp->default_rcv_context = 0;
Vlad Yasevich70331572007-03-23 11:34:36 -07003814 sp->max_burst = sctp_max_burst;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08003815
Linus Torvalds1da177e2005-04-16 15:20:36 -07003816 /* Initialize default setup parameters. These parameters
3817 * can be modified with the SCTP_INITMSG socket option or
3818 * overridden by the SCTP_INIT CMSG.
3819 */
3820 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
3821 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
3822 sp->initmsg.sinit_max_attempts = sctp_max_retrans_init;
Vladislav Yasevich3fd091e2006-08-22 13:29:17 -07003823 sp->initmsg.sinit_max_init_timeo = sctp_rto_max;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003824
3825 /* Initialize default RTO related parameters. These parameters can
3826 * be modified for with the SCTP_RTOINFO socket option.
3827 */
Vladislav Yasevich3fd091e2006-08-22 13:29:17 -07003828 sp->rtoinfo.srto_initial = sctp_rto_initial;
3829 sp->rtoinfo.srto_max = sctp_rto_max;
3830 sp->rtoinfo.srto_min = sctp_rto_min;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003831
3832 /* Initialize default association related parameters. These parameters
3833 * can be modified with the SCTP_ASSOCINFO socket option.
3834 */
3835 sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association;
3836 sp->assocparams.sasoc_number_peer_destinations = 0;
3837 sp->assocparams.sasoc_peer_rwnd = 0;
3838 sp->assocparams.sasoc_local_rwnd = 0;
Vladislav Yasevich3fd091e2006-08-22 13:29:17 -07003839 sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003840
3841 /* Initialize default event subscriptions. By default, all the
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003842 * options are off.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003843 */
3844 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3845
3846 /* Default Peer Address Parameters. These defaults can
3847 * be modified via SCTP_PEER_ADDR_PARAMS
3848 */
Vladislav Yasevich3fd091e2006-08-22 13:29:17 -07003849 sp->hbinterval = sctp_hb_interval;
Frank Filz52ccb8e2005-12-22 11:36:46 -08003850 sp->pathmaxrxt = sctp_max_retrans_path;
3851 sp->pathmtu = 0; // allow default discovery
Vladislav Yasevich3fd091e2006-08-22 13:29:17 -07003852 sp->sackdelay = sctp_sack_timeout;
Vlad Yasevich7bfe8bd2008-06-09 15:45:05 -07003853 sp->sackfreq = 2;
Frank Filz52ccb8e2005-12-22 11:36:46 -08003854 sp->param_flags = SPP_HB_ENABLE |
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09003855 SPP_PMTUD_ENABLE |
3856 SPP_SACKDELAY_ENABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003857
3858 /* If enabled no SCTP message fragmentation will be performed.
3859 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3860 */
3861 sp->disable_fragments = 0;
3862
Sridhar Samudrala208edef2006-09-29 17:08:01 -07003863 /* Enable Nagle algorithm by default. */
3864 sp->nodelay = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003865
3866 /* Enable by default. */
3867 sp->v4mapped = 1;
3868
3869 /* Auto-close idle associations after the configured
3870 * number of seconds. A value of 0 disables this
3871 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3872 * for UDP-style sockets only.
3873 */
3874 sp->autoclose = 0;
3875
3876 /* User specified fragmentation limit. */
3877 sp->user_frag = 0;
3878
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08003879 sp->adaptation_ind = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003880
3881 sp->pf = sctp_get_pf_specific(sk->sk_family);
3882
3883 /* Control variables for partial data delivery. */
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003884 atomic_set(&sp->pd_mode, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003885 skb_queue_head_init(&sp->pd_lobby);
Vlad Yasevichb6e13312007-04-20 12:23:15 -07003886 sp->frag_interleave = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003887
3888 /* Create a per socket endpoint structure. Even if we
3889 * change the data structure relationships, this may still
3890 * be useful for storing pre-connect address information.
3891 */
3892 ep = sctp_endpoint_new(sk, GFP_KERNEL);
3893 if (!ep)
3894 return -ENOMEM;
3895
3896 sp->ep = ep;
3897 sp->hmac = NULL;
3898
3899 SCTP_DBG_OBJCNT_INC(sock);
David S. Miller6f756a82008-11-23 17:34:03 -08003900
3901 local_bh_disable();
Vlad Yasevich81419d82010-04-28 08:47:20 +00003902 percpu_counter_inc(&sctp_sockets_allocated);
Eric Dumazet9a57f7f2008-11-17 02:41:00 -08003903 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
Michio Honda9f7d6532011-04-26 19:32:51 +09003904 if (sctp_default_auto_asconf) {
3905 list_add_tail(&sp->auto_asconf_list,
3906 &sctp_auto_asconf_splist);
3907 sp->do_auto_asconf = 1;
3908 } else
3909 sp->do_auto_asconf = 0;
David S. Miller6f756a82008-11-23 17:34:03 -08003910 local_bh_enable();
3911
Linus Torvalds1da177e2005-04-16 15:20:36 -07003912 return 0;
3913}
3914
3915/* Cleanup any SCTP per socket resources. */
Brian Haley7d06b2e2008-06-14 17:04:49 -07003916SCTP_STATIC void sctp_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003917{
Michio Honda9f7d6532011-04-26 19:32:51 +09003918 struct sctp_sock *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003919
3920 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
3921
3922 /* Release our hold on the endpoint. */
Michio Honda9f7d6532011-04-26 19:32:51 +09003923 sp = sctp_sk(sk);
3924 if (sp->do_auto_asconf) {
3925 sp->do_auto_asconf = 0;
3926 list_del(&sp->auto_asconf_list);
3927 }
3928 sctp_endpoint_free(sp->ep);
Eric Dumazet5bc0b3b2008-11-25 13:53:27 -08003929 local_bh_disable();
Vlad Yasevich81419d82010-04-28 08:47:20 +00003930 percpu_counter_dec(&sctp_sockets_allocated);
Eric Dumazet9a57f7f2008-11-17 02:41:00 -08003931 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
Eric Dumazet5bc0b3b2008-11-25 13:53:27 -08003932 local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003933}
3934
3935/* API 4.1.7 shutdown() - TCP Style Syntax
3936 * int shutdown(int socket, int how);
3937 *
3938 * sd - the socket descriptor of the association to be closed.
3939 * how - Specifies the type of shutdown. The values are
3940 * as follows:
3941 * SHUT_RD
3942 * Disables further receive operations. No SCTP
3943 * protocol action is taken.
3944 * SHUT_WR
3945 * Disables further send operations, and initiates
3946 * the SCTP shutdown sequence.
3947 * SHUT_RDWR
3948 * Disables further send and receive operations
3949 * and initiates the SCTP shutdown sequence.
3950 */
3951SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
3952{
3953 struct sctp_endpoint *ep;
3954 struct sctp_association *asoc;
3955
3956 if (!sctp_style(sk, TCP))
3957 return;
3958
3959 if (how & SEND_SHUTDOWN) {
3960 ep = sctp_sk(sk)->ep;
3961 if (!list_empty(&ep->asocs)) {
3962 asoc = list_entry(ep->asocs.next,
3963 struct sctp_association, asocs);
3964 sctp_primitive_SHUTDOWN(asoc, NULL);
3965 }
3966 }
3967}
3968
3969/* 7.2.1 Association Status (SCTP_STATUS)
3970
3971 * Applications can retrieve current status information about an
3972 * association, including association state, peer receiver window size,
3973 * number of unacked data chunks, and number of data chunks pending
3974 * receipt. This information is read-only.
3975 */
3976static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
3977 char __user *optval,
3978 int __user *optlen)
3979{
3980 struct sctp_status status;
3981 struct sctp_association *asoc = NULL;
3982 struct sctp_transport *transport;
3983 sctp_assoc_t associd;
3984 int retval = 0;
3985
Neil Horman408f22e2007-06-16 14:03:45 -04003986 if (len < sizeof(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003987 retval = -EINVAL;
3988 goto out;
3989 }
3990
Neil Horman408f22e2007-06-16 14:03:45 -04003991 len = sizeof(status);
3992 if (copy_from_user(&status, optval, len)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003993 retval = -EFAULT;
3994 goto out;
3995 }
3996
3997 associd = status.sstat_assoc_id;
3998 asoc = sctp_id2assoc(sk, associd);
3999 if (!asoc) {
4000 retval = -EINVAL;
4001 goto out;
4002 }
4003
4004 transport = asoc->peer.primary_path;
4005
4006 status.sstat_assoc_id = sctp_assoc2id(asoc);
4007 status.sstat_state = asoc->state;
4008 status.sstat_rwnd = asoc->peer.rwnd;
4009 status.sstat_unackdata = asoc->unack_data;
4010
4011 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4012 status.sstat_instrms = asoc->c.sinit_max_instreams;
4013 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4014 status.sstat_fragmentation_point = asoc->frag_point;
4015 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
Al Viro8cec6b82006-11-20 17:23:01 -08004016 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4017 transport->af_specific->sockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004018 /* Map ipv4 address into v4-mapped-on-v6 address. */
4019 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4020 (union sctp_addr *)&status.sstat_primary.spinfo_address);
Frank Filz3f7a87d2005-06-20 13:14:57 -07004021 status.sstat_primary.spinfo_state = transport->state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004022 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4023 status.sstat_primary.spinfo_srtt = transport->srtt;
4024 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
Frank Filz52ccb8e2005-12-22 11:36:46 -08004025 status.sstat_primary.spinfo_mtu = transport->pathmtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004026
Frank Filz3f7a87d2005-06-20 13:14:57 -07004027 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4028 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4029
Linus Torvalds1da177e2005-04-16 15:20:36 -07004030 if (put_user(len, optlen)) {
4031 retval = -EFAULT;
4032 goto out;
4033 }
4034
4035 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
4036 len, status.sstat_state, status.sstat_rwnd,
4037 status.sstat_assoc_id);
4038
4039 if (copy_to_user(optval, &status, len)) {
4040 retval = -EFAULT;
4041 goto out;
4042 }
4043
4044out:
Eric Dumazeta02cec22010-09-22 20:43:57 +00004045 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004046}
4047
4048
4049/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4050 *
4051 * Applications can retrieve information about a specific peer address
4052 * of an association, including its reachability state, congestion
4053 * window, and retransmission timer values. This information is
4054 * read-only.
4055 */
4056static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4057 char __user *optval,
4058 int __user *optlen)
4059{
4060 struct sctp_paddrinfo pinfo;
4061 struct sctp_transport *transport;
4062 int retval = 0;
4063
Neil Horman408f22e2007-06-16 14:03:45 -04004064 if (len < sizeof(pinfo)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004065 retval = -EINVAL;
4066 goto out;
4067 }
4068
Neil Horman408f22e2007-06-16 14:03:45 -04004069 len = sizeof(pinfo);
4070 if (copy_from_user(&pinfo, optval, len)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004071 retval = -EFAULT;
4072 goto out;
4073 }
4074
4075 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4076 pinfo.spinfo_assoc_id);
4077 if (!transport)
4078 return -EINVAL;
4079
4080 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
Frank Filz3f7a87d2005-06-20 13:14:57 -07004081 pinfo.spinfo_state = transport->state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004082 pinfo.spinfo_cwnd = transport->cwnd;
4083 pinfo.spinfo_srtt = transport->srtt;
4084 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
Frank Filz52ccb8e2005-12-22 11:36:46 -08004085 pinfo.spinfo_mtu = transport->pathmtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004086
Frank Filz3f7a87d2005-06-20 13:14:57 -07004087 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4088 pinfo.spinfo_state = SCTP_ACTIVE;
4089
Linus Torvalds1da177e2005-04-16 15:20:36 -07004090 if (put_user(len, optlen)) {
4091 retval = -EFAULT;
4092 goto out;
4093 }
4094
4095 if (copy_to_user(optval, &pinfo, len)) {
4096 retval = -EFAULT;
4097 goto out;
4098 }
4099
4100out:
Eric Dumazeta02cec22010-09-22 20:43:57 +00004101 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004102}
4103
4104/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4105 *
4106 * This option is a on/off flag. If enabled no SCTP message
4107 * fragmentation will be performed. Instead if a message being sent
4108 * exceeds the current PMTU size, the message will NOT be sent and
4109 * instead a error will be indicated to the user.
4110 */
4111static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4112 char __user *optval, int __user *optlen)
4113{
4114 int val;
4115
4116 if (len < sizeof(int))
4117 return -EINVAL;
4118
4119 len = sizeof(int);
4120 val = (sctp_sk(sk)->disable_fragments == 1);
4121 if (put_user(len, optlen))
4122 return -EFAULT;
4123 if (copy_to_user(optval, &val, len))
4124 return -EFAULT;
4125 return 0;
4126}
4127
4128/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4129 *
4130 * This socket option is used to specify various notifications and
4131 * ancillary data the user wishes to receive.
4132 */
4133static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4134 int __user *optlen)
4135{
Neil Horman408f22e2007-06-16 14:03:45 -04004136 if (len < sizeof(struct sctp_event_subscribe))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004137 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004138 len = sizeof(struct sctp_event_subscribe);
4139 if (put_user(len, optlen))
4140 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004141 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4142 return -EFAULT;
4143 return 0;
4144}
4145
4146/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4147 *
4148 * This socket option is applicable to the UDP-style socket only. When
4149 * set it will cause associations that are idle for more than the
4150 * specified number of seconds to automatically close. An association
4151 * being idle is defined an association that has NOT sent or received
4152 * user data. The special value of '0' indicates that no automatic
4153 * close of any associations should be performed. The option expects an
4154 * integer defining the number of seconds of idle time before an
4155 * association is closed.
4156 */
4157static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4158{
4159 /* Applicable to UDP-style socket only */
4160 if (sctp_style(sk, TCP))
4161 return -EOPNOTSUPP;
Neil Horman408f22e2007-06-16 14:03:45 -04004162 if (len < sizeof(int))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004163 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004164 len = sizeof(int);
4165 if (put_user(len, optlen))
4166 return -EFAULT;
4167 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004168 return -EFAULT;
4169 return 0;
4170}
4171
4172/* Helper routine to branch off an association to a new socket. */
4173SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc,
4174 struct socket **sockp)
4175{
4176 struct sock *sk = asoc->base.sk;
4177 struct socket *sock;
Vlad Yasevichd570ee42007-05-15 16:32:39 -04004178 struct sctp_af *af;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004179 int err = 0;
4180
4181 /* An association cannot be branched off from an already peeled-off
4182 * socket, nor is this supported for tcp style sockets.
4183 */
4184 if (!sctp_style(sk, UDP))
4185 return -EINVAL;
4186
4187 /* Create a new socket. */
4188 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4189 if (err < 0)
4190 return err;
4191
Vlad Yasevich914e1c82009-02-13 08:33:44 +00004192 sctp_copy_sock(sock->sk, sk, asoc);
Vlad Yasevich4f444302006-10-30 18:54:32 -08004193
4194 /* Make peeled-off sockets more like 1-1 accepted sockets.
4195 * Set the daddr and initialize id to something more random
4196 */
Vlad Yasevichd570ee42007-05-15 16:32:39 -04004197 af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
4198 af->to_sk_daddr(&asoc->peer.primary_addr, sk);
Vlad Yasevich914e1c82009-02-13 08:33:44 +00004199
4200 /* Populate the fields of the newsk from the oldsk and migrate the
4201 * asoc to the newsk.
4202 */
4203 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
Vlad Yasevich4f444302006-10-30 18:54:32 -08004204
Linus Torvalds1da177e2005-04-16 15:20:36 -07004205 *sockp = sock;
4206
4207 return err;
4208}
4209
4210static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4211{
4212 sctp_peeloff_arg_t peeloff;
4213 struct socket *newsock;
4214 int retval = 0;
4215 struct sctp_association *asoc;
4216
Neil Horman408f22e2007-06-16 14:03:45 -04004217 if (len < sizeof(sctp_peeloff_arg_t))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004218 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004219 len = sizeof(sctp_peeloff_arg_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004220 if (copy_from_user(&peeloff, optval, len))
4221 return -EFAULT;
4222
4223 asoc = sctp_id2assoc(sk, peeloff.associd);
4224 if (!asoc) {
4225 retval = -EINVAL;
4226 goto out;
4227 }
4228
Harvey Harrison0dc47872008-03-05 20:47:47 -08004229 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004230
4231 retval = sctp_do_peeloff(asoc, &newsock);
4232 if (retval < 0)
4233 goto out;
4234
4235 /* Map the socket to an unused fd that can be returned to the user. */
Ulrich Dreppera677a032008-07-23 21:29:17 -07004236 retval = sock_map_fd(newsock, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004237 if (retval < 0) {
4238 sock_release(newsock);
4239 goto out;
4240 }
4241
4242 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -08004243 __func__, sk, asoc, newsock->sk, retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004244
4245 /* Return the fd mapped to the new socket. */
4246 peeloff.sd = retval;
Neil Horman408f22e2007-06-16 14:03:45 -04004247 if (put_user(len, optlen))
4248 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004249 if (copy_to_user(optval, &peeloff, len))
4250 retval = -EFAULT;
4251
4252out:
4253 return retval;
4254}
4255
4256/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4257 *
4258 * Applications can enable or disable heartbeats for any peer address of
4259 * an association, modify an address's heartbeat interval, force a
4260 * heartbeat to be sent immediately, and adjust the address's maximum
4261 * number of retransmissions sent before an address is considered
4262 * unreachable. The following structure is used to access and modify an
4263 * address's parameters:
4264 *
4265 * struct sctp_paddrparams {
Frank Filz52ccb8e2005-12-22 11:36:46 -08004266 * sctp_assoc_t spp_assoc_id;
4267 * struct sockaddr_storage spp_address;
4268 * uint32_t spp_hbinterval;
4269 * uint16_t spp_pathmaxrxt;
4270 * uint32_t spp_pathmtu;
4271 * uint32_t spp_sackdelay;
4272 * uint32_t spp_flags;
4273 * };
Linus Torvalds1da177e2005-04-16 15:20:36 -07004274 *
Frank Filz52ccb8e2005-12-22 11:36:46 -08004275 * spp_assoc_id - (one-to-many style socket) This is filled in the
4276 * application, and identifies the association for
4277 * this query.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004278 * spp_address - This specifies which address is of interest.
4279 * spp_hbinterval - This contains the value of the heartbeat interval,
Frank Filz52ccb8e2005-12-22 11:36:46 -08004280 * in milliseconds. If a value of zero
4281 * is present in this field then no changes are to
4282 * be made to this parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004283 * spp_pathmaxrxt - This contains the maximum number of
4284 * retransmissions before this address shall be
Frank Filz52ccb8e2005-12-22 11:36:46 -08004285 * considered unreachable. If a value of zero
4286 * is present in this field then no changes are to
4287 * be made to this parameter.
4288 * spp_pathmtu - When Path MTU discovery is disabled the value
4289 * specified here will be the "fixed" path mtu.
4290 * Note that if the spp_address field is empty
4291 * then all associations on this address will
4292 * have this fixed path mtu set upon them.
4293 *
4294 * spp_sackdelay - When delayed sack is enabled, this value specifies
4295 * the number of milliseconds that sacks will be delayed
4296 * for. This value will apply to all addresses of an
4297 * association if the spp_address field is empty. Note
4298 * also, that if delayed sack is enabled and this
4299 * value is set to 0, no change is made to the last
4300 * recorded delayed sack timer value.
4301 *
4302 * spp_flags - These flags are used to control various features
4303 * on an association. The flag field may contain
4304 * zero or more of the following options.
4305 *
4306 * SPP_HB_ENABLE - Enable heartbeats on the
4307 * specified address. Note that if the address
4308 * field is empty all addresses for the association
4309 * have heartbeats enabled upon them.
4310 *
4311 * SPP_HB_DISABLE - Disable heartbeats on the
4312 * speicifed address. Note that if the address
4313 * field is empty all addresses for the association
4314 * will have their heartbeats disabled. Note also
4315 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4316 * mutually exclusive, only one of these two should
4317 * be specified. Enabling both fields will have
4318 * undetermined results.
4319 *
4320 * SPP_HB_DEMAND - Request a user initiated heartbeat
4321 * to be made immediately.
4322 *
4323 * SPP_PMTUD_ENABLE - This field will enable PMTU
4324 * discovery upon the specified address. Note that
4325 * if the address feild is empty then all addresses
4326 * on the association are effected.
4327 *
4328 * SPP_PMTUD_DISABLE - This field will disable PMTU
4329 * discovery upon the specified address. Note that
4330 * if the address feild is empty then all addresses
4331 * on the association are effected. Not also that
4332 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4333 * exclusive. Enabling both will have undetermined
4334 * results.
4335 *
4336 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4337 * on delayed sack. The time specified in spp_sackdelay
4338 * is used to specify the sack delay for this address. Note
4339 * that if spp_address is empty then all addresses will
4340 * enable delayed sack and take on the sack delay
4341 * value specified in spp_sackdelay.
4342 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4343 * off delayed sack. If the spp_address field is blank then
4344 * delayed sack is disabled for the entire association. Note
4345 * also that this field is mutually exclusive to
4346 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4347 * results.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004348 */
4349static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
Frank Filz52ccb8e2005-12-22 11:36:46 -08004350 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004351{
Frank Filz52ccb8e2005-12-22 11:36:46 -08004352 struct sctp_paddrparams params;
4353 struct sctp_transport *trans = NULL;
4354 struct sctp_association *asoc = NULL;
4355 struct sctp_sock *sp = sctp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004356
Neil Horman408f22e2007-06-16 14:03:45 -04004357 if (len < sizeof(struct sctp_paddrparams))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004358 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004359 len = sizeof(struct sctp_paddrparams);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004360 if (copy_from_user(&params, optval, len))
4361 return -EFAULT;
4362
Frank Filz52ccb8e2005-12-22 11:36:46 -08004363 /* If an address other than INADDR_ANY is specified, and
4364 * no transport is found, then the request is invalid.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004365 */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -04004366 if (!sctp_is_any(sk, ( union sctp_addr *)&params.spp_address)) {
Frank Filz52ccb8e2005-12-22 11:36:46 -08004367 trans = sctp_addr_id2transport(sk, &params.spp_address,
4368 params.spp_assoc_id);
4369 if (!trans) {
4370 SCTP_DEBUG_PRINTK("Failed no transport\n");
4371 return -EINVAL;
4372 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004373 }
4374
Frank Filz52ccb8e2005-12-22 11:36:46 -08004375 /* Get association, if assoc_id != 0 and the socket is a one
4376 * to many style socket, and an association was not found, then
4377 * the id was invalid.
4378 */
4379 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4380 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4381 SCTP_DEBUG_PRINTK("Failed no association\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004382 return -EINVAL;
Frank Filz52ccb8e2005-12-22 11:36:46 -08004383 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004384
Frank Filz52ccb8e2005-12-22 11:36:46 -08004385 if (trans) {
4386 /* Fetch transport values. */
4387 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4388 params.spp_pathmtu = trans->pathmtu;
4389 params.spp_pathmaxrxt = trans->pathmaxrxt;
4390 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004391
Frank Filz52ccb8e2005-12-22 11:36:46 -08004392 /*draft-11 doesn't say what to return in spp_flags*/
4393 params.spp_flags = trans->param_flags;
4394 } else if (asoc) {
4395 /* Fetch association values. */
4396 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4397 params.spp_pathmtu = asoc->pathmtu;
4398 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4399 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004400
Frank Filz52ccb8e2005-12-22 11:36:46 -08004401 /*draft-11 doesn't say what to return in spp_flags*/
4402 params.spp_flags = asoc->param_flags;
4403 } else {
4404 /* Fetch socket values. */
4405 params.spp_hbinterval = sp->hbinterval;
4406 params.spp_pathmtu = sp->pathmtu;
4407 params.spp_sackdelay = sp->sackdelay;
4408 params.spp_pathmaxrxt = sp->pathmaxrxt;
4409
4410 /*draft-11 doesn't say what to return in spp_flags*/
4411 params.spp_flags = sp->param_flags;
4412 }
4413
Linus Torvalds1da177e2005-04-16 15:20:36 -07004414 if (copy_to_user(optval, &params, len))
4415 return -EFAULT;
4416
4417 if (put_user(len, optlen))
4418 return -EFAULT;
4419
4420 return 0;
4421}
4422
Wei Yongjund364d922008-05-09 15:13:26 -07004423/*
4424 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
Frank Filz77086102005-12-22 11:37:30 -08004425 *
Wei Yongjund364d922008-05-09 15:13:26 -07004426 * This option will effect the way delayed acks are performed. This
4427 * option allows you to get or set the delayed ack time, in
4428 * milliseconds. It also allows changing the delayed ack frequency.
4429 * Changing the frequency to 1 disables the delayed sack algorithm. If
4430 * the assoc_id is 0, then this sets or gets the endpoints default
4431 * values. If the assoc_id field is non-zero, then the set or get
4432 * effects the specified association for the one to many model (the
4433 * assoc_id field is ignored by the one to one model). Note that if
4434 * sack_delay or sack_freq are 0 when setting this option, then the
4435 * current values will remain unchanged.
Frank Filz77086102005-12-22 11:37:30 -08004436 *
Wei Yongjund364d922008-05-09 15:13:26 -07004437 * struct sctp_sack_info {
4438 * sctp_assoc_t sack_assoc_id;
4439 * uint32_t sack_delay;
4440 * uint32_t sack_freq;
4441 * };
Frank Filz77086102005-12-22 11:37:30 -08004442 *
Wei Yongjund364d922008-05-09 15:13:26 -07004443 * sack_assoc_id - This parameter, indicates which association the user
4444 * is performing an action upon. Note that if this field's value is
4445 * zero then the endpoints default value is changed (effecting future
4446 * associations only).
Frank Filz77086102005-12-22 11:37:30 -08004447 *
Wei Yongjund364d922008-05-09 15:13:26 -07004448 * sack_delay - This parameter contains the number of milliseconds that
4449 * the user is requesting the delayed ACK timer be set to. Note that
4450 * this value is defined in the standard to be between 200 and 500
4451 * milliseconds.
Frank Filz77086102005-12-22 11:37:30 -08004452 *
Wei Yongjund364d922008-05-09 15:13:26 -07004453 * sack_freq - This parameter contains the number of packets that must
4454 * be received before a sack is sent without waiting for the delay
4455 * timer to expire. The default value for this is 2, setting this
4456 * value to 1 will disable the delayed sack algorithm.
Frank Filz77086102005-12-22 11:37:30 -08004457 */
Wei Yongjund364d922008-05-09 15:13:26 -07004458static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
Frank Filz77086102005-12-22 11:37:30 -08004459 char __user *optval,
4460 int __user *optlen)
4461{
Wei Yongjund364d922008-05-09 15:13:26 -07004462 struct sctp_sack_info params;
Frank Filz77086102005-12-22 11:37:30 -08004463 struct sctp_association *asoc = NULL;
4464 struct sctp_sock *sp = sctp_sk(sk);
4465
Wei Yongjund364d922008-05-09 15:13:26 -07004466 if (len >= sizeof(struct sctp_sack_info)) {
4467 len = sizeof(struct sctp_sack_info);
4468
4469 if (copy_from_user(&params, optval, len))
4470 return -EFAULT;
4471 } else if (len == sizeof(struct sctp_assoc_value)) {
Joe Perches145ce502010-08-24 13:21:08 +00004472 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4473 pr_warn("Use struct sctp_sack_info instead\n");
Wei Yongjund364d922008-05-09 15:13:26 -07004474 if (copy_from_user(&params, optval, len))
4475 return -EFAULT;
4476 } else
Frank Filz77086102005-12-22 11:37:30 -08004477 return - EINVAL;
4478
Wei Yongjund364d922008-05-09 15:13:26 -07004479 /* Get association, if sack_assoc_id != 0 and the socket is a one
Frank Filz77086102005-12-22 11:37:30 -08004480 * to many style socket, and an association was not found, then
4481 * the id was invalid.
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004482 */
Wei Yongjund364d922008-05-09 15:13:26 -07004483 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4484 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
Frank Filz77086102005-12-22 11:37:30 -08004485 return -EINVAL;
4486
4487 if (asoc) {
4488 /* Fetch association values. */
Wei Yongjund364d922008-05-09 15:13:26 -07004489 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4490 params.sack_delay = jiffies_to_msecs(
Frank Filz77086102005-12-22 11:37:30 -08004491 asoc->sackdelay);
Wei Yongjund364d922008-05-09 15:13:26 -07004492 params.sack_freq = asoc->sackfreq;
4493
4494 } else {
4495 params.sack_delay = 0;
4496 params.sack_freq = 1;
4497 }
Frank Filz77086102005-12-22 11:37:30 -08004498 } else {
4499 /* Fetch socket values. */
Wei Yongjund364d922008-05-09 15:13:26 -07004500 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4501 params.sack_delay = sp->sackdelay;
4502 params.sack_freq = sp->sackfreq;
4503 } else {
4504 params.sack_delay = 0;
4505 params.sack_freq = 1;
4506 }
Frank Filz77086102005-12-22 11:37:30 -08004507 }
4508
4509 if (copy_to_user(optval, &params, len))
4510 return -EFAULT;
4511
4512 if (put_user(len, optlen))
4513 return -EFAULT;
4514
4515 return 0;
4516}
4517
Linus Torvalds1da177e2005-04-16 15:20:36 -07004518/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4519 *
4520 * Applications can specify protocol parameters for the default association
4521 * initialization. The option name argument to setsockopt() and getsockopt()
4522 * is SCTP_INITMSG.
4523 *
4524 * Setting initialization parameters is effective only on an unconnected
4525 * socket (for UDP-style sockets only future associations are effected
4526 * by the change). With TCP-style sockets, this option is inherited by
4527 * sockets derived from a listener socket.
4528 */
4529static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4530{
Neil Horman408f22e2007-06-16 14:03:45 -04004531 if (len < sizeof(struct sctp_initmsg))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004532 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004533 len = sizeof(struct sctp_initmsg);
4534 if (put_user(len, optlen))
4535 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004536 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4537 return -EFAULT;
4538 return 0;
4539}
4540
Linus Torvalds1da177e2005-04-16 15:20:36 -07004541
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004542static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4543 char __user *optval, int __user *optlen)
4544{
4545 struct sctp_association *asoc;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004546 int cnt = 0;
4547 struct sctp_getaddrs getaddrs;
4548 struct sctp_transport *from;
4549 void __user *to;
4550 union sctp_addr temp;
4551 struct sctp_sock *sp = sctp_sk(sk);
4552 int addrlen;
4553 size_t space_left;
4554 int bytes_copied;
4555
4556 if (len < sizeof(struct sctp_getaddrs))
4557 return -EINVAL;
4558
4559 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4560 return -EFAULT;
4561
4562 /* For UDP-style sockets, id specifies the association to query. */
4563 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4564 if (!asoc)
4565 return -EINVAL;
4566
4567 to = optval + offsetof(struct sctp_getaddrs,addrs);
Neil Horman186e2342007-06-18 19:59:16 -04004568 space_left = len - offsetof(struct sctp_getaddrs,addrs);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004569
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07004570 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4571 transports) {
Al Virob3f5b3b2006-11-20 17:22:43 -08004572 memcpy(&temp, &from->ipaddr, sizeof(temp));
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004573 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
Vlad Yasevicha5f4cea2010-04-30 21:42:42 -04004574 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004575 if (space_left < addrlen)
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004576 return -ENOMEM;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004577 if (copy_to_user(to, &temp, addrlen))
4578 return -EFAULT;
4579 to += addrlen;
4580 cnt++;
4581 space_left -= addrlen;
4582 }
4583
4584 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4585 return -EFAULT;
4586 bytes_copied = ((char __user *)to) - optval;
4587 if (put_user(bytes_copied, optlen))
4588 return -EFAULT;
4589
4590 return 0;
4591}
4592
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004593static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4594 size_t space_left, int *bytes_copied)
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004595{
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004596 struct sctp_sockaddr_entry *addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004597 union sctp_addr temp;
4598 int cnt = 0;
4599 int addrlen;
4600
Vlad Yasevich29303542007-09-16 16:02:12 -07004601 rcu_read_lock();
4602 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
4603 if (!addr->valid)
4604 continue;
4605
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004606 if ((PF_INET == sk->sk_family) &&
Al Viro6244be42006-11-20 17:21:44 -08004607 (AF_INET6 == addr->a.sa.sa_family))
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004608 continue;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07004609 if ((PF_INET6 == sk->sk_family) &&
4610 inet_v6_ipv6only(sk) &&
4611 (AF_INET == addr->a.sa.sa_family))
4612 continue;
Al Viro6244be42006-11-20 17:21:44 -08004613 memcpy(&temp, &addr->a, sizeof(temp));
Vlad Yasevichb46ae362008-01-28 14:25:36 -05004614 if (!temp.v4.sin_port)
4615 temp.v4.sin_port = htons(port);
4616
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004617 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4618 &temp);
4619 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
Vlad Yasevich29303542007-09-16 16:02:12 -07004620 if (space_left < addrlen) {
4621 cnt = -ENOMEM;
4622 break;
4623 }
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004624 memcpy(to, &temp, addrlen);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -08004625
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004626 to += addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004627 cnt ++;
4628 space_left -= addrlen;
Vlad Yasevich3663c302007-07-03 12:43:12 -04004629 *bytes_copied += addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004630 }
Vlad Yasevich29303542007-09-16 16:02:12 -07004631 rcu_read_unlock();
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004632
4633 return cnt;
4634}
4635
Linus Torvalds1da177e2005-04-16 15:20:36 -07004636
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004637static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4638 char __user *optval, int __user *optlen)
4639{
4640 struct sctp_bind_addr *bp;
4641 struct sctp_association *asoc;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004642 int cnt = 0;
4643 struct sctp_getaddrs getaddrs;
4644 struct sctp_sockaddr_entry *addr;
4645 void __user *to;
4646 union sctp_addr temp;
4647 struct sctp_sock *sp = sctp_sk(sk);
4648 int addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004649 int err = 0;
4650 size_t space_left;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004651 int bytes_copied = 0;
4652 void *addrs;
Vlad Yasevich70b57b82007-05-09 13:51:31 -07004653 void *buf;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004654
Neil Horman408f22e2007-06-16 14:03:45 -04004655 if (len < sizeof(struct sctp_getaddrs))
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004656 return -EINVAL;
4657
4658 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4659 return -EFAULT;
4660
4661 /*
4662 * For UDP-style sockets, id specifies the association to query.
4663 * If the id field is set to the value '0' then the locally bound
4664 * addresses are returned without regard to any particular
4665 * association.
4666 */
4667 if (0 == getaddrs.assoc_id) {
4668 bp = &sctp_sk(sk)->ep->base.bind_addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004669 } else {
4670 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4671 if (!asoc)
4672 return -EINVAL;
4673 bp = &asoc->base.bind_addr;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004674 }
4675
4676 to = optval + offsetof(struct sctp_getaddrs,addrs);
Neil Horman186e2342007-06-18 19:59:16 -04004677 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4678
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004679 addrs = kmalloc(space_left, GFP_KERNEL);
4680 if (!addrs)
4681 return -ENOMEM;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004682
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004683 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4684 * addresses from the global local address list.
4685 */
4686 if (sctp_list_single_entry(&bp->address_list)) {
4687 addr = list_entry(bp->address_list.next,
4688 struct sctp_sockaddr_entry, list);
Vlad Yasevich52cae8f2008-08-18 10:34:34 -04004689 if (sctp_is_any(sk, &addr->a)) {
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004690 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4691 space_left, &bytes_copied);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004692 if (cnt < 0) {
4693 err = cnt;
Vlad Yasevich559cf712007-09-16 16:03:28 -07004694 goto out;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004695 }
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004696 goto copy_getaddrs;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004697 }
4698 }
4699
Vlad Yasevich70b57b82007-05-09 13:51:31 -07004700 buf = addrs;
Vlad Yasevich559cf712007-09-16 16:03:28 -07004701 /* Protection on the bound address list is not needed since
4702 * in the socket option context we hold a socket lock and
4703 * thus the bound address list can't change.
4704 */
4705 list_for_each_entry(addr, &bp->address_list, list) {
Al Viro6244be42006-11-20 17:21:44 -08004706 memcpy(&temp, &addr->a, sizeof(temp));
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004707 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4708 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004709 if (space_left < addrlen) {
4710 err = -ENOMEM; /*fixme: right error?*/
Vlad Yasevich559cf712007-09-16 16:03:28 -07004711 goto out;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004712 }
Vlad Yasevich70b57b82007-05-09 13:51:31 -07004713 memcpy(buf, &temp, addrlen);
4714 buf += addrlen;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004715 bytes_copied += addrlen;
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004716 cnt ++;
4717 space_left -= addrlen;
4718 }
4719
4720copy_getaddrs:
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004721 if (copy_to_user(to, addrs, bytes_copied)) {
4722 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02004723 goto out;
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004724 }
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04004725 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4726 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02004727 goto out;
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04004728 }
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004729 if (put_user(bytes_copied, optlen))
Vlad Yasevichfe979ac2007-05-23 11:11:37 -04004730 err = -EFAULT;
Sebastian Siewiord6f9fda2007-07-27 22:55:59 +02004731out:
Vlad Yasevichaad97f32007-04-28 21:09:04 -07004732 kfree(addrs);
Ivan Skytte Jørgensen5fe467e2005-10-06 21:36:17 -07004733 return err;
4734}
4735
Linus Torvalds1da177e2005-04-16 15:20:36 -07004736/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4737 *
4738 * Requests that the local SCTP stack use the enclosed peer address as
4739 * the association primary. The enclosed address must be one of the
4740 * association peer's addresses.
4741 */
4742static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4743 char __user *optval, int __user *optlen)
4744{
4745 struct sctp_prim prim;
4746 struct sctp_association *asoc;
4747 struct sctp_sock *sp = sctp_sk(sk);
4748
Neil Horman408f22e2007-06-16 14:03:45 -04004749 if (len < sizeof(struct sctp_prim))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004750 return -EINVAL;
4751
Neil Horman408f22e2007-06-16 14:03:45 -04004752 len = sizeof(struct sctp_prim);
4753
4754 if (copy_from_user(&prim, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004755 return -EFAULT;
4756
4757 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4758 if (!asoc)
4759 return -EINVAL;
4760
4761 if (!asoc->peer.primary_path)
4762 return -ENOTCONN;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09004763
Al Viro8cec6b82006-11-20 17:23:01 -08004764 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4765 asoc->peer.primary_path->af_specific->sockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004766
4767 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4768 (union sctp_addr *)&prim.ssp_addr);
4769
Neil Horman408f22e2007-06-16 14:03:45 -04004770 if (put_user(len, optlen))
4771 return -EFAULT;
4772 if (copy_to_user(optval, &prim, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004773 return -EFAULT;
4774
4775 return 0;
4776}
4777
4778/*
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004779 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004780 *
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004781 * Requests that the local endpoint set the specified Adaptation Layer
Linus Torvalds1da177e2005-04-16 15:20:36 -07004782 * Indication parameter for all future INIT and INIT-ACK exchanges.
4783 */
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004784static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004785 char __user *optval, int __user *optlen)
4786{
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004787 struct sctp_setadaptation adaptation;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004788
Neil Horman408f22e2007-06-16 14:03:45 -04004789 if (len < sizeof(struct sctp_setadaptation))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004790 return -EINVAL;
4791
Neil Horman408f22e2007-06-16 14:03:45 -04004792 len = sizeof(struct sctp_setadaptation);
4793
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004794 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
Neil Horman408f22e2007-06-16 14:03:45 -04004795
4796 if (put_user(len, optlen))
4797 return -EFAULT;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08004798 if (copy_to_user(optval, &adaptation, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004799 return -EFAULT;
Ivan Skytte Jorgensena1ab3582005-10-28 15:33:24 -07004800
Linus Torvalds1da177e2005-04-16 15:20:36 -07004801 return 0;
4802}
4803
4804/*
4805 *
4806 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4807 *
4808 * Applications that wish to use the sendto() system call may wish to
4809 * specify a default set of parameters that would normally be supplied
4810 * through the inclusion of ancillary data. This socket option allows
4811 * such an application to set the default sctp_sndrcvinfo structure.
4812
4813
4814 * The application that wishes to use this socket option simply passes
4815 * in to this call the sctp_sndrcvinfo structure defined in Section
4816 * 5.2.2) The input parameters accepted by this call include
4817 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4818 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4819 * to this call if the caller is using the UDP model.
4820 *
4821 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4822 */
4823static int sctp_getsockopt_default_send_param(struct sock *sk,
4824 int len, char __user *optval,
4825 int __user *optlen)
4826{
4827 struct sctp_sndrcvinfo info;
4828 struct sctp_association *asoc;
4829 struct sctp_sock *sp = sctp_sk(sk);
4830
Neil Horman408f22e2007-06-16 14:03:45 -04004831 if (len < sizeof(struct sctp_sndrcvinfo))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004832 return -EINVAL;
Neil Horman408f22e2007-06-16 14:03:45 -04004833
4834 len = sizeof(struct sctp_sndrcvinfo);
4835
4836 if (copy_from_user(&info, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004837 return -EFAULT;
4838
4839 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4840 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4841 return -EINVAL;
4842
4843 if (asoc) {
4844 info.sinfo_stream = asoc->default_stream;
4845 info.sinfo_flags = asoc->default_flags;
4846 info.sinfo_ppid = asoc->default_ppid;
4847 info.sinfo_context = asoc->default_context;
4848 info.sinfo_timetolive = asoc->default_timetolive;
4849 } else {
4850 info.sinfo_stream = sp->default_stream;
4851 info.sinfo_flags = sp->default_flags;
4852 info.sinfo_ppid = sp->default_ppid;
4853 info.sinfo_context = sp->default_context;
4854 info.sinfo_timetolive = sp->default_timetolive;
4855 }
4856
Neil Horman408f22e2007-06-16 14:03:45 -04004857 if (put_user(len, optlen))
4858 return -EFAULT;
4859 if (copy_to_user(optval, &info, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004860 return -EFAULT;
4861
4862 return 0;
4863}
4864
4865/*
4866 *
4867 * 7.1.5 SCTP_NODELAY
4868 *
4869 * Turn on/off any Nagle-like algorithm. This means that packets are
4870 * generally sent as soon as possible and no unnecessary delays are
4871 * introduced, at the cost of more packets in the network. Expects an
4872 * integer boolean flag.
4873 */
4874
4875static int sctp_getsockopt_nodelay(struct sock *sk, int len,
4876 char __user *optval, int __user *optlen)
4877{
4878 int val;
4879
4880 if (len < sizeof(int))
4881 return -EINVAL;
4882
4883 len = sizeof(int);
4884 val = (sctp_sk(sk)->nodelay == 1);
4885 if (put_user(len, optlen))
4886 return -EFAULT;
4887 if (copy_to_user(optval, &val, len))
4888 return -EFAULT;
4889 return 0;
4890}
4891
4892/*
4893 *
4894 * 7.1.1 SCTP_RTOINFO
4895 *
4896 * The protocol parameters used to initialize and bound retransmission
4897 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4898 * and modify these parameters.
4899 * All parameters are time values, in milliseconds. A value of 0, when
4900 * modifying the parameters, indicates that the current value should not
4901 * be changed.
4902 *
4903 */
4904static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
4905 char __user *optval,
4906 int __user *optlen) {
4907 struct sctp_rtoinfo rtoinfo;
4908 struct sctp_association *asoc;
4909
Neil Horman408f22e2007-06-16 14:03:45 -04004910 if (len < sizeof (struct sctp_rtoinfo))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004911 return -EINVAL;
4912
Neil Horman408f22e2007-06-16 14:03:45 -04004913 len = sizeof(struct sctp_rtoinfo);
4914
4915 if (copy_from_user(&rtoinfo, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004916 return -EFAULT;
4917
4918 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
4919
4920 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
4921 return -EINVAL;
4922
4923 /* Values corresponding to the specific association. */
4924 if (asoc) {
4925 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
4926 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
4927 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
4928 } else {
4929 /* Values corresponding to the endpoint. */
4930 struct sctp_sock *sp = sctp_sk(sk);
4931
4932 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
4933 rtoinfo.srto_max = sp->rtoinfo.srto_max;
4934 rtoinfo.srto_min = sp->rtoinfo.srto_min;
4935 }
4936
4937 if (put_user(len, optlen))
4938 return -EFAULT;
4939
4940 if (copy_to_user(optval, &rtoinfo, len))
4941 return -EFAULT;
4942
4943 return 0;
4944}
4945
4946/*
4947 *
4948 * 7.1.2 SCTP_ASSOCINFO
4949 *
Michael Opdenacker59c51592007-05-09 08:57:56 +02004950 * This option is used to tune the maximum retransmission attempts
Linus Torvalds1da177e2005-04-16 15:20:36 -07004951 * of the association.
4952 * Returns an error if the new association retransmission value is
4953 * greater than the sum of the retransmission value of the peer.
4954 * See [SCTP] for more information.
4955 *
4956 */
4957static int sctp_getsockopt_associnfo(struct sock *sk, int len,
4958 char __user *optval,
4959 int __user *optlen)
4960{
4961
4962 struct sctp_assocparams assocparams;
4963 struct sctp_association *asoc;
4964 struct list_head *pos;
4965 int cnt = 0;
4966
Neil Horman408f22e2007-06-16 14:03:45 -04004967 if (len < sizeof (struct sctp_assocparams))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004968 return -EINVAL;
4969
Neil Horman408f22e2007-06-16 14:03:45 -04004970 len = sizeof(struct sctp_assocparams);
4971
4972 if (copy_from_user(&assocparams, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004973 return -EFAULT;
4974
4975 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
4976
4977 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
4978 return -EINVAL;
4979
4980 /* Values correspoinding to the specific association */
Vladislav Yasevich17337212005-04-28 11:57:54 -07004981 if (asoc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004982 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
4983 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
4984 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
4985 assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
4986 * 1000) +
4987 (asoc->cookie_life.tv_usec
4988 / 1000);
4989
4990 list_for_each(pos, &asoc->peer.transport_addr_list) {
4991 cnt ++;
4992 }
4993
4994 assocparams.sasoc_number_peer_destinations = cnt;
4995 } else {
4996 /* Values corresponding to the endpoint */
4997 struct sctp_sock *sp = sctp_sk(sk);
4998
4999 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5000 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5001 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5002 assocparams.sasoc_cookie_life =
5003 sp->assocparams.sasoc_cookie_life;
5004 assocparams.sasoc_number_peer_destinations =
5005 sp->assocparams.
5006 sasoc_number_peer_destinations;
5007 }
5008
5009 if (put_user(len, optlen))
5010 return -EFAULT;
5011
5012 if (copy_to_user(optval, &assocparams, len))
5013 return -EFAULT;
5014
5015 return 0;
5016}
5017
5018/*
5019 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5020 *
5021 * This socket option is a boolean flag which turns on or off mapped V4
5022 * addresses. If this option is turned on and the socket is type
5023 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5024 * If this option is turned off, then no mapping will be done of V4
5025 * addresses and a user will receive both PF_INET6 and PF_INET type
5026 * addresses on the socket.
5027 */
5028static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5029 char __user *optval, int __user *optlen)
5030{
5031 int val;
5032 struct sctp_sock *sp = sctp_sk(sk);
5033
5034 if (len < sizeof(int))
5035 return -EINVAL;
5036
5037 len = sizeof(int);
5038 val = sp->v4mapped;
5039 if (put_user(len, optlen))
5040 return -EFAULT;
5041 if (copy_to_user(optval, &val, len))
5042 return -EFAULT;
5043
5044 return 0;
5045}
5046
5047/*
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005048 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5049 * (chapter and verse is quoted at sctp_setsockopt_context())
5050 */
5051static int sctp_getsockopt_context(struct sock *sk, int len,
5052 char __user *optval, int __user *optlen)
5053{
5054 struct sctp_assoc_value params;
5055 struct sctp_sock *sp;
5056 struct sctp_association *asoc;
5057
Neil Horman408f22e2007-06-16 14:03:45 -04005058 if (len < sizeof(struct sctp_assoc_value))
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005059 return -EINVAL;
5060
Neil Horman408f22e2007-06-16 14:03:45 -04005061 len = sizeof(struct sctp_assoc_value);
5062
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005063 if (copy_from_user(&params, optval, len))
5064 return -EFAULT;
5065
5066 sp = sctp_sk(sk);
5067
5068 if (params.assoc_id != 0) {
5069 asoc = sctp_id2assoc(sk, params.assoc_id);
5070 if (!asoc)
5071 return -EINVAL;
5072 params.assoc_value = asoc->default_rcv_context;
5073 } else {
5074 params.assoc_value = sp->default_rcv_context;
5075 }
5076
5077 if (put_user(len, optlen))
5078 return -EFAULT;
5079 if (copy_to_user(optval, &params, len))
5080 return -EFAULT;
5081
5082 return 0;
5083}
5084
5085/*
Wei Yongjune89c2092008-12-25 16:54:58 -08005086 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5087 * This option will get or set the maximum size to put in any outgoing
5088 * SCTP DATA chunk. If a message is larger than this size it will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07005089 * fragmented by SCTP into the specified size. Note that the underlying
5090 * SCTP implementation may fragment into smaller sized chunks when the
5091 * PMTU of the underlying association is smaller than the value set by
Wei Yongjune89c2092008-12-25 16:54:58 -08005092 * the user. The default value for this option is '0' which indicates
5093 * the user is NOT limiting fragmentation and only the PMTU will effect
5094 * SCTP's choice of DATA chunk size. Note also that values set larger
5095 * than the maximum size of an IP datagram will effectively let SCTP
5096 * control fragmentation (i.e. the same as setting this option to 0).
5097 *
5098 * The following structure is used to access and modify this parameter:
5099 *
5100 * struct sctp_assoc_value {
5101 * sctp_assoc_t assoc_id;
5102 * uint32_t assoc_value;
5103 * };
5104 *
5105 * assoc_id: This parameter is ignored for one-to-one style sockets.
5106 * For one-to-many style sockets this parameter indicates which
5107 * association the user is performing an action upon. Note that if
5108 * this field's value is zero then the endpoints default value is
5109 * changed (effecting future associations only).
5110 * assoc_value: This parameter specifies the maximum size in bytes.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005111 */
5112static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5113 char __user *optval, int __user *optlen)
5114{
Wei Yongjune89c2092008-12-25 16:54:58 -08005115 struct sctp_assoc_value params;
5116 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005117
Wei Yongjune89c2092008-12-25 16:54:58 -08005118 if (len == sizeof(int)) {
Joe Perches145ce502010-08-24 13:21:08 +00005119 pr_warn("Use of int in maxseg socket option deprecated\n");
5120 pr_warn("Use struct sctp_assoc_value instead\n");
Wei Yongjune89c2092008-12-25 16:54:58 -08005121 params.assoc_id = 0;
5122 } else if (len >= sizeof(struct sctp_assoc_value)) {
5123 len = sizeof(struct sctp_assoc_value);
5124 if (copy_from_user(&params, optval, sizeof(params)))
5125 return -EFAULT;
5126 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07005127 return -EINVAL;
5128
Wei Yongjune89c2092008-12-25 16:54:58 -08005129 asoc = sctp_id2assoc(sk, params.assoc_id);
5130 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5131 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005132
Wei Yongjune89c2092008-12-25 16:54:58 -08005133 if (asoc)
5134 params.assoc_value = asoc->frag_point;
5135 else
5136 params.assoc_value = sctp_sk(sk)->user_frag;
5137
Linus Torvalds1da177e2005-04-16 15:20:36 -07005138 if (put_user(len, optlen))
5139 return -EFAULT;
Wei Yongjune89c2092008-12-25 16:54:58 -08005140 if (len == sizeof(int)) {
5141 if (copy_to_user(optval, &params.assoc_value, len))
5142 return -EFAULT;
5143 } else {
5144 if (copy_to_user(optval, &params, len))
5145 return -EFAULT;
5146 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005147
5148 return 0;
5149}
5150
Vlad Yasevichb6e13312007-04-20 12:23:15 -07005151/*
5152 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5153 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5154 */
5155static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5156 char __user *optval, int __user *optlen)
5157{
5158 int val;
5159
5160 if (len < sizeof(int))
5161 return -EINVAL;
5162
5163 len = sizeof(int);
5164
5165 val = sctp_sk(sk)->frag_interleave;
5166 if (put_user(len, optlen))
5167 return -EFAULT;
5168 if (copy_to_user(optval, &val, len))
5169 return -EFAULT;
5170
5171 return 0;
5172}
5173
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005174/*
5175 * 7.1.25. Set or Get the sctp partial delivery point
5176 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5177 */
5178static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5179 char __user *optval,
5180 int __user *optlen)
5181{
YOSHIFUJI Hideaki9cbcbf42007-07-19 10:44:50 +09005182 u32 val;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005183
5184 if (len < sizeof(u32))
5185 return -EINVAL;
5186
5187 len = sizeof(u32);
5188
5189 val = sctp_sk(sk)->pd_point;
5190 if (put_user(len, optlen))
5191 return -EFAULT;
5192 if (copy_to_user(optval, &val, len))
5193 return -EFAULT;
5194
Wei Yongjun7d743b72010-12-14 16:10:41 +00005195 return 0;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005196}
5197
Vlad Yasevich70331572007-03-23 11:34:36 -07005198/*
5199 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5200 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5201 */
5202static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5203 char __user *optval,
5204 int __user *optlen)
5205{
Neil Horman219b99a2008-03-05 13:44:46 -08005206 struct sctp_assoc_value params;
5207 struct sctp_sock *sp;
5208 struct sctp_association *asoc;
Vlad Yasevich70331572007-03-23 11:34:36 -07005209
Neil Horman219b99a2008-03-05 13:44:46 -08005210 if (len == sizeof(int)) {
Joe Perches145ce502010-08-24 13:21:08 +00005211 pr_warn("Use of int in max_burst socket option deprecated\n");
5212 pr_warn("Use struct sctp_assoc_value instead\n");
Neil Horman219b99a2008-03-05 13:44:46 -08005213 params.assoc_id = 0;
Wei Yongjunc6db93a2009-03-02 09:46:12 +00005214 } else if (len >= sizeof(struct sctp_assoc_value)) {
5215 len = sizeof(struct sctp_assoc_value);
Neil Horman219b99a2008-03-05 13:44:46 -08005216 if (copy_from_user(&params, optval, len))
5217 return -EFAULT;
5218 } else
5219 return -EINVAL;
Vlad Yasevich70331572007-03-23 11:34:36 -07005220
Neil Horman219b99a2008-03-05 13:44:46 -08005221 sp = sctp_sk(sk);
Vlad Yasevich70331572007-03-23 11:34:36 -07005222
Neil Horman219b99a2008-03-05 13:44:46 -08005223 if (params.assoc_id != 0) {
5224 asoc = sctp_id2assoc(sk, params.assoc_id);
5225 if (!asoc)
5226 return -EINVAL;
5227 params.assoc_value = asoc->max_burst;
5228 } else
5229 params.assoc_value = sp->max_burst;
5230
5231 if (len == sizeof(int)) {
5232 if (copy_to_user(optval, &params.assoc_value, len))
5233 return -EFAULT;
5234 } else {
5235 if (copy_to_user(optval, &params, len))
5236 return -EFAULT;
5237 }
5238
5239 return 0;
5240
Vlad Yasevich70331572007-03-23 11:34:36 -07005241}
5242
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005243static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5244 char __user *optval, int __user *optlen)
5245{
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005246 struct sctp_hmacalgo __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005247 struct sctp_hmac_algo_param *hmacs;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005248 __u16 data_len = 0;
5249 u32 num_idents;
5250
5251 if (!sctp_auth_enable)
5252 return -EACCES;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005253
5254 hmacs = sctp_sk(sk)->ep->auth_hmacs_list;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005255 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005256
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005257 if (len < sizeof(struct sctp_hmacalgo) + data_len)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005258 return -EINVAL;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005259
5260 len = sizeof(struct sctp_hmacalgo) + data_len;
5261 num_idents = data_len / sizeof(u16);
5262
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005263 if (put_user(len, optlen))
5264 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005265 if (put_user(num_idents, &p->shmac_num_idents))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005266 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005267 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5268 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005269 return 0;
5270}
5271
5272static int sctp_getsockopt_active_key(struct sock *sk, int len,
5273 char __user *optval, int __user *optlen)
5274{
5275 struct sctp_authkeyid val;
5276 struct sctp_association *asoc;
5277
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005278 if (!sctp_auth_enable)
5279 return -EACCES;
5280
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005281 if (len < sizeof(struct sctp_authkeyid))
5282 return -EINVAL;
5283 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5284 return -EFAULT;
5285
5286 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5287 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5288 return -EINVAL;
5289
5290 if (asoc)
5291 val.scact_keynumber = asoc->active_key_id;
5292 else
5293 val.scact_keynumber = sctp_sk(sk)->ep->active_key_id;
5294
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005295 len = sizeof(struct sctp_authkeyid);
5296 if (put_user(len, optlen))
5297 return -EFAULT;
5298 if (copy_to_user(optval, &val, len))
5299 return -EFAULT;
5300
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005301 return 0;
5302}
5303
5304static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5305 char __user *optval, int __user *optlen)
5306{
Al Viro411223c2007-10-14 19:21:20 +01005307 struct sctp_authchunks __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005308 struct sctp_authchunks val;
5309 struct sctp_association *asoc;
5310 struct sctp_chunks_param *ch;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005311 u32 num_chunks = 0;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005312 char __user *to;
5313
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005314 if (!sctp_auth_enable)
5315 return -EACCES;
5316
5317 if (len < sizeof(struct sctp_authchunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005318 return -EINVAL;
5319
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005320 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005321 return -EFAULT;
5322
Al Viro411223c2007-10-14 19:21:20 +01005323 to = p->gauth_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005324 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5325 if (!asoc)
5326 return -EINVAL;
5327
5328 ch = asoc->peer.peer_chunks;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005329 if (!ch)
5330 goto num;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005331
5332 /* See if the user provided enough room for all the data */
Vlad Yasevichb40db682008-02-27 14:40:37 -05005333 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5334 if (len < num_chunks)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005335 return -EINVAL;
5336
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005337 if (copy_to_user(to, ch->chunks, num_chunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005338 return -EFAULT;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005339num:
5340 len = sizeof(struct sctp_authchunks) + num_chunks;
5341 if (put_user(len, optlen)) return -EFAULT;
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05005342 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5343 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005344 return 0;
5345}
5346
5347static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5348 char __user *optval, int __user *optlen)
5349{
Al Viro411223c2007-10-14 19:21:20 +01005350 struct sctp_authchunks __user *p = (void __user *)optval;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005351 struct sctp_authchunks val;
5352 struct sctp_association *asoc;
5353 struct sctp_chunks_param *ch;
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005354 u32 num_chunks = 0;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005355 char __user *to;
5356
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005357 if (!sctp_auth_enable)
5358 return -EACCES;
5359
5360 if (len < sizeof(struct sctp_authchunks))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005361 return -EINVAL;
5362
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005363 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005364 return -EFAULT;
5365
Al Viro411223c2007-10-14 19:21:20 +01005366 to = p->gauth_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005367 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5368 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5369 return -EINVAL;
5370
5371 if (asoc)
5372 ch = (struct sctp_chunks_param*)asoc->c.auth_chunks;
5373 else
5374 ch = sctp_sk(sk)->ep->auth_chunk_list;
5375
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005376 if (!ch)
5377 goto num;
5378
Vlad Yasevichb40db682008-02-27 14:40:37 -05005379 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005380 if (len < sizeof(struct sctp_authchunks) + num_chunks)
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005381 return -EINVAL;
5382
Vlad Yasevich5e739d12008-08-21 03:34:25 -07005383 if (copy_to_user(to, ch->chunks, num_chunks))
5384 return -EFAULT;
5385num:
5386 len = sizeof(struct sctp_authchunks) + num_chunks;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005387 if (put_user(len, optlen))
5388 return -EFAULT;
Vlad Yasevich7e8616d2008-02-27 16:04:52 -05005389 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5390 return -EFAULT;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005391
5392 return 0;
5393}
5394
Wei Yongjunaea3c5c2008-12-25 16:57:24 -08005395/*
5396 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5397 * This option gets the current number of associations that are attached
5398 * to a one-to-many style socket. The option value is an uint32_t.
5399 */
5400static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5401 char __user *optval, int __user *optlen)
5402{
5403 struct sctp_sock *sp = sctp_sk(sk);
5404 struct sctp_association *asoc;
5405 u32 val = 0;
5406
5407 if (sctp_style(sk, TCP))
5408 return -EOPNOTSUPP;
5409
5410 if (len < sizeof(u32))
5411 return -EINVAL;
5412
5413 len = sizeof(u32);
5414
5415 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5416 val++;
5417 }
5418
5419 if (put_user(len, optlen))
5420 return -EFAULT;
5421 if (copy_to_user(optval, &val, len))
5422 return -EFAULT;
5423
5424 return 0;
5425}
5426
Wei Yongjun209ba422011-04-17 17:27:08 +00005427/*
Michio Honda7dc04d72011-04-26 20:16:31 +09005428 * 8.1.23 SCTP_AUTO_ASCONF
5429 * See the corresponding setsockopt entry as description
5430 */
5431static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5432 char __user *optval, int __user *optlen)
5433{
5434 int val = 0;
5435
5436 if (len < sizeof(int))
5437 return -EINVAL;
5438
5439 len = sizeof(int);
5440 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5441 val = 1;
5442 if (put_user(len, optlen))
5443 return -EFAULT;
5444 if (copy_to_user(optval, &val, len))
5445 return -EFAULT;
5446 return 0;
5447}
5448
5449/*
Wei Yongjun209ba422011-04-17 17:27:08 +00005450 * 8.2.6. Get the Current Identifiers of Associations
5451 * (SCTP_GET_ASSOC_ID_LIST)
5452 *
5453 * This option gets the current list of SCTP association identifiers of
5454 * the SCTP associations handled by a one-to-many style socket.
5455 */
5456static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5457 char __user *optval, int __user *optlen)
5458{
5459 struct sctp_sock *sp = sctp_sk(sk);
5460 struct sctp_association *asoc;
5461 struct sctp_assoc_ids *ids;
5462 u32 num = 0;
5463
5464 if (sctp_style(sk, TCP))
5465 return -EOPNOTSUPP;
5466
5467 if (len < sizeof(struct sctp_assoc_ids))
5468 return -EINVAL;
5469
5470 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5471 num++;
5472 }
5473
5474 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5475 return -EINVAL;
5476
5477 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5478
5479 ids = kmalloc(len, GFP_KERNEL);
5480 if (unlikely(!ids))
5481 return -ENOMEM;
5482
5483 ids->gaids_number_of_ids = num;
5484 num = 0;
5485 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5486 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5487 }
5488
5489 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5490 kfree(ids);
5491 return -EFAULT;
5492 }
5493
5494 kfree(ids);
5495 return 0;
5496}
5497
Linus Torvalds1da177e2005-04-16 15:20:36 -07005498SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
5499 char __user *optval, int __user *optlen)
5500{
5501 int retval = 0;
5502 int len;
5503
Frank Filz3f7a87d2005-06-20 13:14:57 -07005504 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5505 sk, optname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005506
5507 /* I can hardly begin to describe how wrong this is. This is
5508 * so broken as to be worse than useless. The API draft
5509 * REALLY is NOT helpful here... I am not convinced that the
5510 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5511 * are at all well-founded.
5512 */
5513 if (level != SOL_SCTP) {
5514 struct sctp_af *af = sctp_sk(sk)->pf->af;
5515
5516 retval = af->getsockopt(sk, level, optname, optval, optlen);
5517 return retval;
5518 }
5519
5520 if (get_user(len, optlen))
5521 return -EFAULT;
5522
5523 sctp_lock_sock(sk);
5524
5525 switch (optname) {
5526 case SCTP_STATUS:
5527 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5528 break;
5529 case SCTP_DISABLE_FRAGMENTS:
5530 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5531 optlen);
5532 break;
5533 case SCTP_EVENTS:
5534 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5535 break;
5536 case SCTP_AUTOCLOSE:
5537 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5538 break;
5539 case SCTP_SOCKOPT_PEELOFF:
5540 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5541 break;
5542 case SCTP_PEER_ADDR_PARAMS:
5543 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5544 optlen);
5545 break;
Shan Wei4580ccc2011-01-18 22:39:00 +00005546 case SCTP_DELAYED_SACK:
Wei Yongjund364d922008-05-09 15:13:26 -07005547 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
Frank Filz77086102005-12-22 11:37:30 -08005548 optlen);
5549 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005550 case SCTP_INITMSG:
5551 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
5552 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005553 case SCTP_GET_PEER_ADDRS:
5554 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
5555 optlen);
5556 break;
5557 case SCTP_GET_LOCAL_ADDRS:
5558 retval = sctp_getsockopt_local_addrs(sk, len, optval,
5559 optlen);
5560 break;
Vlad Yasevichc6ba68a2009-06-01 12:41:15 -04005561 case SCTP_SOCKOPT_CONNECTX3:
5562 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
5563 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005564 case SCTP_DEFAULT_SEND_PARAM:
5565 retval = sctp_getsockopt_default_send_param(sk, len,
5566 optval, optlen);
5567 break;
5568 case SCTP_PRIMARY_ADDR:
5569 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
5570 break;
5571 case SCTP_NODELAY:
5572 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
5573 break;
5574 case SCTP_RTOINFO:
5575 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
5576 break;
5577 case SCTP_ASSOCINFO:
5578 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
5579 break;
5580 case SCTP_I_WANT_MAPPED_V4_ADDR:
5581 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
5582 break;
5583 case SCTP_MAXSEG:
5584 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
5585 break;
5586 case SCTP_GET_PEER_ADDR_INFO:
5587 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
5588 optlen);
5589 break;
Ivan Skytte Jorgensen0f3fffd2006-12-20 16:07:04 -08005590 case SCTP_ADAPTATION_LAYER:
5591 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005592 optlen);
5593 break;
Ivan Skytte Jorgensen6ab792f2006-12-13 16:34:22 -08005594 case SCTP_CONTEXT:
5595 retval = sctp_getsockopt_context(sk, len, optval, optlen);
5596 break;
Vlad Yasevichb6e13312007-04-20 12:23:15 -07005597 case SCTP_FRAGMENT_INTERLEAVE:
5598 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
5599 optlen);
5600 break;
Vlad Yasevichd49d91d2007-03-23 11:32:00 -07005601 case SCTP_PARTIAL_DELIVERY_POINT:
5602 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
5603 optlen);
5604 break;
Vlad Yasevich70331572007-03-23 11:34:36 -07005605 case SCTP_MAX_BURST:
5606 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
5607 break;
Vlad Yasevich65b07e52007-09-16 19:34:00 -07005608 case SCTP_AUTH_KEY:
5609 case SCTP_AUTH_CHUNK:
5610 case SCTP_AUTH_DELETE_KEY:
5611 retval = -EOPNOTSUPP;
5612 break;
5613 case SCTP_HMAC_IDENT:
5614 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
5615 break;
5616 case SCTP_AUTH_ACTIVE_KEY:
5617 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
5618 break;
5619 case SCTP_PEER_AUTH_CHUNKS:
5620 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
5621 optlen);
5622 break;
5623 case SCTP_LOCAL_AUTH_CHUNKS:
5624 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
5625 optlen);
5626 break;
Wei Yongjunaea3c5c2008-12-25 16:57:24 -08005627 case SCTP_GET_ASSOC_NUMBER:
5628 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
5629 break;
Wei Yongjun209ba422011-04-17 17:27:08 +00005630 case SCTP_GET_ASSOC_ID_LIST:
5631 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
5632 break;
Michio Honda7dc04d72011-04-26 20:16:31 +09005633 case SCTP_AUTO_ASCONF:
5634 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
5635 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005636 default:
5637 retval = -ENOPROTOOPT;
5638 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07005639 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005640
5641 sctp_release_sock(sk);
5642 return retval;
5643}
5644
5645static void sctp_hash(struct sock *sk)
5646{
5647 /* STUB */
5648}
5649
5650static void sctp_unhash(struct sock *sk)
5651{
5652 /* STUB */
5653}
5654
5655/* Check if port is acceptable. Possibly find first available port.
5656 *
5657 * The port hash table (contained in the 'global' SCTP protocol storage
5658 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5659 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5660 * list (the list number is the port number hashed out, so as you
5661 * would expect from a hash function, all the ports in a given list have
5662 * such a number that hashes out to the same list number; you were
5663 * expecting that, right?); so each list has a set of ports, with a
5664 * link to the socket (struct sock) that uses it, the port number and
5665 * a fastreuse flag (FIXME: NPI ipg).
5666 */
5667static struct sctp_bind_bucket *sctp_bucket_create(
5668 struct sctp_bind_hashbucket *head, unsigned short snum);
5669
5670static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
5671{
5672 struct sctp_bind_hashbucket *head; /* hash list */
5673 struct sctp_bind_bucket *pp; /* hash list port iterator */
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05005674 struct hlist_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005675 unsigned short snum;
5676 int ret;
5677
Al Viro04afd8b2006-11-20 17:02:01 -08005678 snum = ntohs(addr->v4.sin_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005679
5680 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
5681 sctp_local_bh_disable();
5682
5683 if (snum == 0) {
Stephen Hemminger06393002007-10-10 17:30:18 -07005684 /* Search for an available port. */
Stephen Hemminger227b60f2007-10-10 17:30:46 -07005685 int low, high, remaining, index;
5686 unsigned int rover;
5687
5688 inet_get_local_port_range(&low, &high);
5689 remaining = (high - low) + 1;
5690 rover = net_random() % remaining + low;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005691
Linus Torvalds1da177e2005-04-16 15:20:36 -07005692 do {
5693 rover++;
5694 if ((rover < low) || (rover > high))
5695 rover = low;
Amerigo Wange3826f12010-05-05 00:27:06 +00005696 if (inet_is_reserved_local_port(rover))
5697 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005698 index = sctp_phashfn(rover);
5699 head = &sctp_port_hashtable[index];
5700 sctp_spin_lock(&head->lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05005701 sctp_for_each_hentry(pp, node, &head->chain)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005702 if (pp->port == rover)
5703 goto next;
5704 break;
5705 next:
5706 sctp_spin_unlock(&head->lock);
5707 } while (--remaining > 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005708
5709 /* Exhausted local port range during search? */
5710 ret = 1;
5711 if (remaining <= 0)
5712 goto fail;
5713
5714 /* OK, here is the one we will use. HEAD (the port
5715 * hash table list entry) is non-NULL and we hold it's
5716 * mutex.
5717 */
5718 snum = rover;
5719 } else {
5720 /* We are given an specific port number; we verify
5721 * that it is not being used. If it is used, we will
5722 * exahust the search in the hash list corresponding
5723 * to the port number (snum) - we detect that with the
5724 * port iterator, pp being NULL.
5725 */
5726 head = &sctp_port_hashtable[sctp_phashfn(snum)];
5727 sctp_spin_lock(&head->lock);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05005728 sctp_for_each_hentry(pp, node, &head->chain) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005729 if (pp->port == snum)
5730 goto pp_found;
5731 }
5732 }
5733 pp = NULL;
5734 goto pp_not_found;
5735pp_found:
5736 if (!hlist_empty(&pp->owner)) {
5737 /* We had a port hash table hit - there is an
5738 * available port (pp != NULL) and it is being
5739 * used by other socket (pp->owner not empty); that other
5740 * socket is going to be sk2.
5741 */
5742 int reuse = sk->sk_reuse;
5743 struct sock *sk2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005744
5745 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
Vlad Yasevichce5325c2007-05-04 13:34:49 -07005746 if (pp->fastreuse && sk->sk_reuse &&
5747 sk->sk_state != SCTP_SS_LISTENING)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005748 goto success;
5749
5750 /* Run through the list of sockets bound to the port
5751 * (pp->port) [via the pointers bind_next and
5752 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5753 * we get the endpoint they describe and run through
5754 * the endpoint's list of IP (v4 or v6) addresses,
5755 * comparing each of the addresses with the address of
5756 * the socket sk. If we find a match, then that means
5757 * that this port/socket (sk) combination are already
5758 * in an endpoint.
5759 */
5760 sk_for_each_bound(sk2, node, &pp->owner) {
5761 struct sctp_endpoint *ep2;
5762 ep2 = sctp_sk(sk2)->ep;
5763
Vlad Yasevich4e540642008-07-18 23:06:32 -07005764 if (sk == sk2 ||
5765 (reuse && sk2->sk_reuse &&
5766 sk2->sk_state != SCTP_SS_LISTENING))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005767 continue;
5768
Vlad Yasevich7dab83d2008-07-18 23:05:40 -07005769 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
5770 sctp_sk(sk2), sctp_sk(sk))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005771 ret = (long)sk2;
5772 goto fail_unlock;
5773 }
5774 }
5775 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5776 }
5777pp_not_found:
5778 /* If there was a hash table miss, create a new port. */
5779 ret = 1;
5780 if (!pp && !(pp = sctp_bucket_create(head, snum)))
5781 goto fail_unlock;
5782
5783 /* In either case (hit or miss), make sure fastreuse is 1 only
5784 * if sk->sk_reuse is too (that is, if the caller requested
5785 * SO_REUSEADDR on this socket -sk-).
5786 */
Vlad Yasevichce5325c2007-05-04 13:34:49 -07005787 if (hlist_empty(&pp->owner)) {
5788 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
5789 pp->fastreuse = 1;
5790 else
5791 pp->fastreuse = 0;
5792 } else if (pp->fastreuse &&
5793 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005794 pp->fastreuse = 0;
5795
5796 /* We are set, so fill up all the data in the hash table
5797 * entry, tie the socket list information with the rest of the
5798 * sockets FIXME: Blurry, NPI (ipg).
5799 */
5800success:
Linus Torvalds1da177e2005-04-16 15:20:36 -07005801 if (!sctp_sk(sk)->bind_hash) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +00005802 inet_sk(sk)->inet_num = snum;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005803 sk_add_bind_node(sk, &pp->owner);
5804 sctp_sk(sk)->bind_hash = pp;
5805 }
5806 ret = 0;
5807
5808fail_unlock:
5809 sctp_spin_unlock(&head->lock);
5810
5811fail:
5812 sctp_local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005813 return ret;
5814}
5815
5816/* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5817 * port is requested.
5818 */
5819static int sctp_get_port(struct sock *sk, unsigned short snum)
5820{
5821 long ret;
5822 union sctp_addr addr;
5823 struct sctp_af *af = sctp_sk(sk)->pf->af;
5824
5825 /* Set up a dummy address struct from the sk. */
5826 af->from_sk(&addr, sk);
5827 addr.v4.sin_port = htons(snum);
5828
5829 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5830 ret = sctp_get_port_local(sk, &addr);
5831
Eric Dumazeta02cec22010-09-22 20:43:57 +00005832 return ret ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005833}
5834
5835/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07005836 * Move a socket to LISTENING state.
5837 */
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00005838SCTP_STATIC int sctp_listen_start(struct sock *sk, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005839{
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00005840 struct sctp_sock *sp = sctp_sk(sk);
5841 struct sctp_endpoint *ep = sp->ep;
Herbert Xu1b489e12006-08-20 15:07:14 +10005842 struct crypto_hash *tfm = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005843
5844 /* Allocate HMAC for generating cookie. */
Vlad Yasevich23b29ed2008-07-18 23:06:07 -07005845 if (!sctp_sk(sk)->hmac && sctp_hmac_alg) {
Herbert Xu1b489e12006-08-20 15:07:14 +10005846 tfm = crypto_alloc_hash(sctp_hmac_alg, 0, CRYPTO_ALG_ASYNC);
Vlad Yasevich8dc49842007-05-09 13:50:20 -07005847 if (IS_ERR(tfm)) {
5848 if (net_ratelimit()) {
Joe Perches145ce502010-08-24 13:21:08 +00005849 pr_info("failed to load transform for %s: %ld\n",
Vlad Yasevich8dc49842007-05-09 13:50:20 -07005850 sctp_hmac_alg, PTR_ERR(tfm));
5851 }
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00005852 return -ENOSYS;
5853 }
5854 sctp_sk(sk)->hmac = tfm;
5855 }
5856
5857 /*
5858 * If a bind() or sctp_bindx() is not called prior to a listen()
5859 * call that allows new associations to be accepted, the system
5860 * picks an ephemeral port and will choose an address set equivalent
5861 * to binding with a wildcard address.
5862 *
5863 * This is not currently spelled out in the SCTP sockets
5864 * extensions draft, but follows the practice as seen in TCP
5865 * sockets.
5866 *
5867 */
5868 sk->sk_state = SCTP_SS_LISTENING;
5869 if (!ep->base.bind_addr.port) {
5870 if (sctp_autobind(sk))
5871 return -EAGAIN;
5872 } else {
Eric Dumazetc720c7e2009-10-15 06:30:45 +00005873 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00005874 sk->sk_state = SCTP_SS_CLOSED;
5875 return -EADDRINUSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005876 }
5877 }
5878
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00005879 sk->sk_max_ack_backlog = backlog;
5880 sctp_hash_endpoint(ep);
5881 return 0;
5882}
5883
5884/*
5885 * 4.1.3 / 5.1.3 listen()
5886 *
5887 * By default, new associations are not accepted for UDP style sockets.
5888 * An application uses listen() to mark a socket as being able to
5889 * accept new associations.
5890 *
5891 * On TCP style sockets, applications use listen() to ready the SCTP
5892 * endpoint for accepting inbound associations.
5893 *
5894 * On both types of endpoints a backlog of '0' disables listening.
5895 *
5896 * Move a socket to LISTENING state.
5897 */
5898int sctp_inet_listen(struct socket *sock, int backlog)
5899{
5900 struct sock *sk = sock->sk;
5901 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5902 int err = -EINVAL;
5903
5904 if (unlikely(backlog < 0))
5905 return err;
5906
5907 sctp_lock_sock(sk);
5908
5909 /* Peeled-off sockets are not allowed to listen(). */
5910 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
5911 goto out;
5912
5913 if (sock->state != SS_UNCONNECTED)
5914 goto out;
5915
5916 /* If backlog is zero, disable listening. */
5917 if (!backlog) {
5918 if (sctp_sstate(sk, CLOSED))
5919 goto out;
5920
5921 err = 0;
5922 sctp_unhash_endpoint(ep);
5923 sk->sk_state = SCTP_SS_CLOSED;
5924 if (sk->sk_reuse)
5925 sctp_sk(sk)->bind_hash->fastreuse = 1;
5926 goto out;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07005927 }
5928
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00005929 /* If we are already listening, just update the backlog */
5930 if (sctp_sstate(sk, LISTENING))
5931 sk->sk_max_ack_backlog = backlog;
5932 else {
5933 err = sctp_listen_start(sk, backlog);
5934 if (err)
5935 goto out;
5936 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005937
Vlad Yasevich5e8f3f72009-03-12 09:49:17 +00005938 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005939out:
5940 sctp_release_sock(sk);
5941 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005942}
5943
5944/*
5945 * This function is done by modeling the current datagram_poll() and the
5946 * tcp_poll(). Note that, based on these implementations, we don't
5947 * lock the socket in this function, even though it seems that,
5948 * ideally, locking or some other mechanisms can be used to ensure
Neil Horman9bffc4a2005-12-19 14:24:40 -08005949 * the integrity of the counters (sndbuf and wmem_alloc) used
Linus Torvalds1da177e2005-04-16 15:20:36 -07005950 * in this place. We assume that we don't need locks either until proven
5951 * otherwise.
5952 *
5953 * Another thing to note is that we include the Async I/O support
5954 * here, again, by modeling the current TCP/UDP code. We don't have
5955 * a good way to test with it yet.
5956 */
5957unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
5958{
5959 struct sock *sk = sock->sk;
5960 struct sctp_sock *sp = sctp_sk(sk);
5961 unsigned int mask;
5962
Eric Dumazetaa395142010-04-20 13:03:51 +00005963 poll_wait(file, sk_sleep(sk), wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005964
5965 /* A TCP-style listening socket becomes readable when the accept queue
5966 * is not empty.
5967 */
5968 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
5969 return (!list_empty(&sp->ep->asocs)) ?
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09005970 (POLLIN | POLLRDNORM) : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005971
5972 mask = 0;
5973
5974 /* Is there any exceptional events? */
5975 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
5976 mask |= POLLERR;
Davide Libenzif348d702006-03-25 03:07:39 -08005977 if (sk->sk_shutdown & RCV_SHUTDOWN)
Eric Dumazetdb409802010-09-06 11:13:50 +00005978 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005979 if (sk->sk_shutdown == SHUTDOWN_MASK)
5980 mask |= POLLHUP;
5981
5982 /* Is it readable? Reconsider this code with TCP-style support. */
Eric Dumazetdb409802010-09-06 11:13:50 +00005983 if (!skb_queue_empty(&sk->sk_receive_queue))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005984 mask |= POLLIN | POLLRDNORM;
5985
5986 /* The association is either gone or not ready. */
5987 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
5988 return mask;
5989
5990 /* Is it writable? */
5991 if (sctp_writeable(sk)) {
5992 mask |= POLLOUT | POLLWRNORM;
5993 } else {
5994 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
5995 /*
5996 * Since the socket is not locked, the buffer
5997 * might be made available after the writeable check and
5998 * before the bit is set. This could cause a lost I/O
5999 * signal. tcp_poll() has a race breaker for this race
6000 * condition. Based on their implementation, we put
6001 * in the following code to cover it as well.
6002 */
6003 if (sctp_writeable(sk))
6004 mask |= POLLOUT | POLLWRNORM;
6005 }
6006 return mask;
6007}
6008
6009/********************************************************************
6010 * 2nd Level Abstractions
6011 ********************************************************************/
6012
6013static struct sctp_bind_bucket *sctp_bucket_create(
6014 struct sctp_bind_hashbucket *head, unsigned short snum)
6015{
6016 struct sctp_bind_bucket *pp;
6017
Christoph Lameter54e6ecb2006-12-06 20:33:16 -08006018 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006019 if (pp) {
Li Zefan935a7f62008-04-10 01:58:06 -07006020 SCTP_DBG_OBJCNT_INC(bind_bucket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006021 pp->port = snum;
6022 pp->fastreuse = 0;
6023 INIT_HLIST_HEAD(&pp->owner);
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05006024 hlist_add_head(&pp->node, &head->chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006025 }
6026 return pp;
6027}
6028
6029/* Caller must hold hashbucket lock for this tb with local BH disabled */
6030static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6031{
Sridhar Samudrala37fa6872006-07-21 14:45:47 -07006032 if (pp && hlist_empty(&pp->owner)) {
Vlad Yasevichd970dbf2007-11-09 11:43:40 -05006033 __hlist_del(&pp->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006034 kmem_cache_free(sctp_bucket_cachep, pp);
6035 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6036 }
6037}
6038
6039/* Release this socket's reference to a local port. */
6040static inline void __sctp_put_port(struct sock *sk)
6041{
6042 struct sctp_bind_hashbucket *head =
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006043 &sctp_port_hashtable[sctp_phashfn(inet_sk(sk)->inet_num)];
Linus Torvalds1da177e2005-04-16 15:20:36 -07006044 struct sctp_bind_bucket *pp;
6045
6046 sctp_spin_lock(&head->lock);
6047 pp = sctp_sk(sk)->bind_hash;
6048 __sk_del_bind_node(sk);
6049 sctp_sk(sk)->bind_hash = NULL;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006050 inet_sk(sk)->inet_num = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006051 sctp_bucket_destroy(pp);
6052 sctp_spin_unlock(&head->lock);
6053}
6054
6055void sctp_put_port(struct sock *sk)
6056{
6057 sctp_local_bh_disable();
6058 __sctp_put_port(sk);
6059 sctp_local_bh_enable();
6060}
6061
6062/*
6063 * The system picks an ephemeral port and choose an address set equivalent
6064 * to binding with a wildcard address.
6065 * One of those addresses will be the primary address for the association.
6066 * This automatically enables the multihoming capability of SCTP.
6067 */
6068static int sctp_autobind(struct sock *sk)
6069{
6070 union sctp_addr autoaddr;
6071 struct sctp_af *af;
Al Viro6fbfa9f2006-11-20 17:24:53 -08006072 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006073
6074 /* Initialize a local sockaddr structure to INADDR_ANY. */
6075 af = sctp_sk(sk)->pf->af;
6076
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006077 port = htons(inet_sk(sk)->inet_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006078 af->inaddr_any(&autoaddr, port);
6079
6080 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6081}
6082
6083/* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6084 *
6085 * From RFC 2292
6086 * 4.2 The cmsghdr Structure *
6087 *
6088 * When ancillary data is sent or received, any number of ancillary data
6089 * objects can be specified by the msg_control and msg_controllen members of
6090 * the msghdr structure, because each object is preceded by
6091 * a cmsghdr structure defining the object's length (the cmsg_len member).
6092 * Historically Berkeley-derived implementations have passed only one object
6093 * at a time, but this API allows multiple objects to be
6094 * passed in a single call to sendmsg() or recvmsg(). The following example
6095 * shows two ancillary data objects in a control buffer.
6096 *
6097 * |<--------------------------- msg_controllen -------------------------->|
6098 * | |
6099 *
6100 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6101 *
6102 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6103 * | | |
6104 *
6105 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6106 *
6107 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6108 * | | | | |
6109 *
6110 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6111 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6112 *
6113 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6114 *
6115 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6116 * ^
6117 * |
6118 *
6119 * msg_control
6120 * points here
6121 */
6122SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
6123 sctp_cmsgs_t *cmsgs)
6124{
6125 struct cmsghdr *cmsg;
Vlad Yasevichab38fb02008-04-12 18:40:06 -07006126 struct msghdr *my_msg = (struct msghdr *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006127
6128 for (cmsg = CMSG_FIRSTHDR(msg);
6129 cmsg != NULL;
Vlad Yasevichab38fb02008-04-12 18:40:06 -07006130 cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
6131 if (!CMSG_OK(my_msg, cmsg))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006132 return -EINVAL;
6133
6134 /* Should we parse this header or ignore? */
6135 if (cmsg->cmsg_level != IPPROTO_SCTP)
6136 continue;
6137
6138 /* Strictly check lengths following example in SCM code. */
6139 switch (cmsg->cmsg_type) {
6140 case SCTP_INIT:
6141 /* SCTP Socket API Extension
6142 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
6143 *
6144 * This cmsghdr structure provides information for
6145 * initializing new SCTP associations with sendmsg().
6146 * The SCTP_INITMSG socket option uses this same data
6147 * structure. This structure is not used for
6148 * recvmsg().
6149 *
6150 * cmsg_level cmsg_type cmsg_data[]
6151 * ------------ ------------ ----------------------
6152 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6153 */
6154 if (cmsg->cmsg_len !=
6155 CMSG_LEN(sizeof(struct sctp_initmsg)))
6156 return -EINVAL;
6157 cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
6158 break;
6159
6160 case SCTP_SNDRCV:
6161 /* SCTP Socket API Extension
6162 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6163 *
6164 * This cmsghdr structure specifies SCTP options for
6165 * sendmsg() and describes SCTP header information
6166 * about a received message through recvmsg().
6167 *
6168 * cmsg_level cmsg_type cmsg_data[]
6169 * ------------ ------------ ----------------------
6170 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6171 */
6172 if (cmsg->cmsg_len !=
6173 CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6174 return -EINVAL;
6175
6176 cmsgs->info =
6177 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
6178
6179 /* Minimally, validate the sinfo_flags. */
6180 if (cmsgs->info->sinfo_flags &
Ivan Skytte Jorgenseneaa5c542005-10-28 15:10:00 -07006181 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6182 SCTP_ABORT | SCTP_EOF))
Linus Torvalds1da177e2005-04-16 15:20:36 -07006183 return -EINVAL;
6184 break;
6185
6186 default:
6187 return -EINVAL;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07006188 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07006189 }
6190 return 0;
6191}
6192
6193/*
6194 * Wait for a packet..
6195 * Note: This function is the same function as in core/datagram.c
6196 * with a few modifications to make lksctp work.
6197 */
6198static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p)
6199{
6200 int error;
6201 DEFINE_WAIT(wait);
6202
Eric Dumazetaa395142010-04-20 13:03:51 +00006203 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006204
6205 /* Socket errors? */
6206 error = sock_error(sk);
6207 if (error)
6208 goto out;
6209
6210 if (!skb_queue_empty(&sk->sk_receive_queue))
6211 goto ready;
6212
6213 /* Socket shut down? */
6214 if (sk->sk_shutdown & RCV_SHUTDOWN)
6215 goto out;
6216
6217 /* Sequenced packets can come disconnected. If so we report the
6218 * problem.
6219 */
6220 error = -ENOTCONN;
6221
6222 /* Is there a good reason to think that we may receive some data? */
6223 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6224 goto out;
6225
6226 /* Handle signals. */
6227 if (signal_pending(current))
6228 goto interrupted;
6229
6230 /* Let another process have a go. Since we are going to sleep
6231 * anyway. Note: This may cause odd behaviors if the message
6232 * does not fit in the user's buffer, but this seems to be the
6233 * only way to honor MSG_DONTWAIT realistically.
6234 */
6235 sctp_release_sock(sk);
6236 *timeo_p = schedule_timeout(*timeo_p);
6237 sctp_lock_sock(sk);
6238
6239ready:
Eric Dumazetaa395142010-04-20 13:03:51 +00006240 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006241 return 0;
6242
6243interrupted:
6244 error = sock_intr_errno(*timeo_p);
6245
6246out:
Eric Dumazetaa395142010-04-20 13:03:51 +00006247 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006248 *err = error;
6249 return error;
6250}
6251
6252/* Receive a datagram.
6253 * Note: This is pretty much the same routine as in core/datagram.c
6254 * with a few changes to make lksctp work.
6255 */
6256static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6257 int noblock, int *err)
6258{
6259 int error;
6260 struct sk_buff *skb;
6261 long timeo;
6262
Linus Torvalds1da177e2005-04-16 15:20:36 -07006263 timeo = sock_rcvtimeo(sk, noblock);
6264
6265 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6266 timeo, MAX_SCHEDULE_TIMEOUT);
6267
6268 do {
6269 /* Again only user level code calls this function,
6270 * so nothing interrupt level
6271 * will suddenly eat the receive_queue.
6272 *
6273 * Look at current nfs client by the way...
David Shwatrz8917a3c2010-12-02 09:01:55 +00006274 * However, this function was correct in any case. 8)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006275 */
6276 if (flags & MSG_PEEK) {
Herbert Xu1e061ab2005-06-18 22:56:42 -07006277 spin_lock_bh(&sk->sk_receive_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006278 skb = skb_peek(&sk->sk_receive_queue);
6279 if (skb)
6280 atomic_inc(&skb->users);
Herbert Xu1e061ab2005-06-18 22:56:42 -07006281 spin_unlock_bh(&sk->sk_receive_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006282 } else {
6283 skb = skb_dequeue(&sk->sk_receive_queue);
6284 }
6285
6286 if (skb)
6287 return skb;
6288
Neil Horman6736dc32005-12-02 20:30:06 -08006289 /* Caller is allowed not to check sk->sk_err before calling. */
6290 error = sock_error(sk);
6291 if (error)
6292 goto no_packet;
6293
Linus Torvalds1da177e2005-04-16 15:20:36 -07006294 if (sk->sk_shutdown & RCV_SHUTDOWN)
6295 break;
6296
6297 /* User doesn't want to wait. */
6298 error = -EAGAIN;
6299 if (!timeo)
6300 goto no_packet;
6301 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6302
6303 return NULL;
6304
6305no_packet:
6306 *err = error;
6307 return NULL;
6308}
6309
6310/* If sndbuf has changed, wake up per association sndbuf waiters. */
6311static void __sctp_write_space(struct sctp_association *asoc)
6312{
6313 struct sock *sk = asoc->base.sk;
6314 struct socket *sock = sk->sk_socket;
6315
6316 if ((sctp_wspace(asoc) > 0) && sock) {
6317 if (waitqueue_active(&asoc->wait))
6318 wake_up_interruptible(&asoc->wait);
6319
6320 if (sctp_writeable(sk)) {
Eric Dumazeteaefd112011-02-18 03:26:36 +00006321 wait_queue_head_t *wq = sk_sleep(sk);
6322
6323 if (wq && waitqueue_active(wq))
6324 wake_up_interruptible(wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006325
6326 /* Note that we try to include the Async I/O support
6327 * here by modeling from the current TCP/UDP code.
6328 * We have not tested with it yet.
6329 */
Eric Dumazeteaefd112011-02-18 03:26:36 +00006330 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08006331 sock_wake_async(sock,
6332 SOCK_WAKE_SPACE, POLL_OUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006333 }
6334 }
6335}
6336
6337/* Do accounting for the sndbuf space.
6338 * Decrement the used sndbuf space of the corresponding association by the
6339 * data size which was just transmitted(freed).
6340 */
6341static void sctp_wfree(struct sk_buff *skb)
6342{
6343 struct sctp_association *asoc;
6344 struct sctp_chunk *chunk;
6345 struct sock *sk;
6346
6347 /* Get the saved chunk pointer. */
6348 chunk = *((struct sctp_chunk **)(skb->cb));
6349 asoc = chunk->asoc;
6350 sk = asoc->base.sk;
Neil Horman4eb701d2005-04-28 12:02:04 -07006351 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6352 sizeof(struct sk_buff) +
6353 sizeof(struct sctp_chunk);
6354
Neil Horman4eb701d2005-04-28 12:02:04 -07006355 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6356
Neil Horman4d93df02007-08-15 16:07:44 -07006357 /*
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006358 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
Neil Horman4d93df02007-08-15 16:07:44 -07006359 */
6360 sk->sk_wmem_queued -= skb->truesize;
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006361 sk_mem_uncharge(sk, skb->truesize);
Neil Horman4d93df02007-08-15 16:07:44 -07006362
Neil Horman4eb701d2005-04-28 12:02:04 -07006363 sock_wfree(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006364 __sctp_write_space(asoc);
6365
6366 sctp_association_put(asoc);
6367}
6368
Vlad Yasevich331c4ee2006-10-09 21:34:04 -07006369/* Do accounting for the receive space on the socket.
6370 * Accounting for the association is done in ulpevent.c
6371 * We set this as a destructor for the cloned data skbs so that
6372 * accounting is done at the correct time.
6373 */
6374void sctp_sock_rfree(struct sk_buff *skb)
6375{
6376 struct sock *sk = skb->sk;
6377 struct sctp_ulpevent *event = sctp_skb2event(skb);
6378
6379 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
Neil Horman4d93df02007-08-15 16:07:44 -07006380
6381 /*
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006382 * Mimic the behavior of sock_rfree
Neil Horman4d93df02007-08-15 16:07:44 -07006383 */
Hideo Aoki3ab224b2007-12-31 00:11:19 -08006384 sk_mem_uncharge(sk, event->rmem_len);
Vlad Yasevich331c4ee2006-10-09 21:34:04 -07006385}
6386
6387
Linus Torvalds1da177e2005-04-16 15:20:36 -07006388/* Helper function to wait for space in the sndbuf. */
6389static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6390 size_t msg_len)
6391{
6392 struct sock *sk = asoc->base.sk;
6393 int err = 0;
6394 long current_timeo = *timeo_p;
6395 DEFINE_WAIT(wait);
6396
6397 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +09006398 asoc, (long)(*timeo_p), msg_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006399
6400 /* Increment the association's refcnt. */
6401 sctp_association_hold(asoc);
6402
6403 /* Wait on the association specific sndbuf space. */
6404 for (;;) {
6405 prepare_to_wait_exclusive(&asoc->wait, &wait,
6406 TASK_INTERRUPTIBLE);
6407 if (!*timeo_p)
6408 goto do_nonblock;
6409 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6410 asoc->base.dead)
6411 goto do_error;
6412 if (signal_pending(current))
6413 goto do_interrupted;
6414 if (msg_len <= sctp_wspace(asoc))
6415 break;
6416
6417 /* Let another process have a go. Since we are going
6418 * to sleep anyway.
6419 */
6420 sctp_release_sock(sk);
6421 current_timeo = schedule_timeout(current_timeo);
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07006422 BUG_ON(sk != asoc->base.sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006423 sctp_lock_sock(sk);
6424
6425 *timeo_p = current_timeo;
6426 }
6427
6428out:
6429 finish_wait(&asoc->wait, &wait);
6430
6431 /* Release the association's refcnt. */
6432 sctp_association_put(asoc);
6433
6434 return err;
6435
6436do_error:
6437 err = -EPIPE;
6438 goto out;
6439
6440do_interrupted:
6441 err = sock_intr_errno(*timeo_p);
6442 goto out;
6443
6444do_nonblock:
6445 err = -EAGAIN;
6446 goto out;
6447}
6448
Wei Yongjun561b1732010-04-28 08:47:18 +00006449void sctp_data_ready(struct sock *sk, int len)
6450{
David S. Miller7ef52732010-05-02 21:43:40 -07006451 struct socket_wq *wq;
6452
6453 rcu_read_lock();
6454 wq = rcu_dereference(sk->sk_wq);
6455 if (wq_has_sleeper(wq))
6456 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
Wei Yongjun561b1732010-04-28 08:47:18 +00006457 POLLRDNORM | POLLRDBAND);
6458 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
David S. Miller7ef52732010-05-02 21:43:40 -07006459 rcu_read_unlock();
Wei Yongjun561b1732010-04-28 08:47:18 +00006460}
6461
Linus Torvalds1da177e2005-04-16 15:20:36 -07006462/* If socket sndbuf has changed, wake up all per association waiters. */
6463void sctp_write_space(struct sock *sk)
6464{
6465 struct sctp_association *asoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006466
6467 /* Wake up the tasks in each wait queue. */
Robert P. J. Day9dbc15f2008-04-12 18:54:24 -07006468 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006469 __sctp_write_space(asoc);
6470 }
6471}
6472
6473/* Is there any sndbuf space available on the socket?
6474 *
Neil Horman9bffc4a2005-12-19 14:24:40 -08006475 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07006476 * associations on the same socket. For a UDP-style socket with
6477 * multiple associations, it is possible for it to be "unwriteable"
6478 * prematurely. I assume that this is acceptable because
6479 * a premature "unwriteable" is better than an accidental "writeable" which
6480 * would cause an unwanted block under certain circumstances. For the 1-1
6481 * UDP-style sockets or TCP-style sockets, this code should work.
6482 * - Daisy
6483 */
6484static int sctp_writeable(struct sock *sk)
6485{
6486 int amt = 0;
6487
Eric Dumazet31e6d362009-06-17 19:05:41 -07006488 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006489 if (amt < 0)
6490 amt = 0;
6491 return amt;
6492}
6493
6494/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6495 * returns immediately with EINPROGRESS.
6496 */
6497static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
6498{
6499 struct sock *sk = asoc->base.sk;
6500 int err = 0;
6501 long current_timeo = *timeo_p;
6502 DEFINE_WAIT(wait);
6503
Harvey Harrison0dc47872008-03-05 20:47:47 -08006504 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__, asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -07006505 (long)(*timeo_p));
6506
6507 /* Increment the association's refcnt. */
6508 sctp_association_hold(asoc);
6509
6510 for (;;) {
6511 prepare_to_wait_exclusive(&asoc->wait, &wait,
6512 TASK_INTERRUPTIBLE);
6513 if (!*timeo_p)
6514 goto do_nonblock;
6515 if (sk->sk_shutdown & RCV_SHUTDOWN)
6516 break;
6517 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6518 asoc->base.dead)
6519 goto do_error;
6520 if (signal_pending(current))
6521 goto do_interrupted;
6522
6523 if (sctp_state(asoc, ESTABLISHED))
6524 break;
6525
6526 /* Let another process have a go. Since we are going
6527 * to sleep anyway.
6528 */
6529 sctp_release_sock(sk);
6530 current_timeo = schedule_timeout(current_timeo);
6531 sctp_lock_sock(sk);
6532
6533 *timeo_p = current_timeo;
6534 }
6535
6536out:
6537 finish_wait(&asoc->wait, &wait);
6538
6539 /* Release the association's refcnt. */
6540 sctp_association_put(asoc);
6541
6542 return err;
6543
6544do_error:
Vlad Yasevich81845c22006-01-30 15:59:54 -08006545 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006546 err = -ETIMEDOUT;
6547 else
6548 err = -ECONNREFUSED;
6549 goto out;
6550
6551do_interrupted:
6552 err = sock_intr_errno(*timeo_p);
6553 goto out;
6554
6555do_nonblock:
6556 err = -EINPROGRESS;
6557 goto out;
6558}
6559
6560static int sctp_wait_for_accept(struct sock *sk, long timeo)
6561{
6562 struct sctp_endpoint *ep;
6563 int err = 0;
6564 DEFINE_WAIT(wait);
6565
6566 ep = sctp_sk(sk)->ep;
6567
6568
6569 for (;;) {
Eric Dumazetaa395142010-04-20 13:03:51 +00006570 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
Linus Torvalds1da177e2005-04-16 15:20:36 -07006571 TASK_INTERRUPTIBLE);
6572
6573 if (list_empty(&ep->asocs)) {
6574 sctp_release_sock(sk);
6575 timeo = schedule_timeout(timeo);
6576 sctp_lock_sock(sk);
6577 }
6578
6579 err = -EINVAL;
6580 if (!sctp_sstate(sk, LISTENING))
6581 break;
6582
6583 err = 0;
6584 if (!list_empty(&ep->asocs))
6585 break;
6586
6587 err = sock_intr_errno(timeo);
6588 if (signal_pending(current))
6589 break;
6590
6591 err = -EAGAIN;
6592 if (!timeo)
6593 break;
6594 }
6595
Eric Dumazetaa395142010-04-20 13:03:51 +00006596 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006597
6598 return err;
6599}
6600
sebastian@breakpoint.cc04675212007-07-26 23:21:31 +02006601static void sctp_wait_for_close(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006602{
6603 DEFINE_WAIT(wait);
6604
6605 do {
Eric Dumazetaa395142010-04-20 13:03:51 +00006606 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006607 if (list_empty(&sctp_sk(sk)->ep->asocs))
6608 break;
6609 sctp_release_sock(sk);
6610 timeout = schedule_timeout(timeout);
6611 sctp_lock_sock(sk);
6612 } while (!signal_pending(current) && timeout);
6613
Eric Dumazetaa395142010-04-20 13:03:51 +00006614 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006615}
6616
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006617static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
6618{
6619 struct sk_buff *frag;
6620
6621 if (!skb->data_len)
6622 goto done;
6623
6624 /* Don't forget the fragments. */
David S. Miller1b003be2009-06-09 00:22:35 -07006625 skb_walk_frags(skb, frag)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006626 sctp_skb_set_owner_r_frag(frag, sk);
6627
6628done:
6629 sctp_skb_set_owner_r(skb, sk);
6630}
6631
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006632void sctp_copy_sock(struct sock *newsk, struct sock *sk,
6633 struct sctp_association *asoc)
6634{
6635 struct inet_sock *inet = inet_sk(sk);
Julia Lawall09cb47a2010-01-21 02:43:20 -08006636 struct inet_sock *newinet;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006637
6638 newsk->sk_type = sk->sk_type;
6639 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
6640 newsk->sk_flags = sk->sk_flags;
6641 newsk->sk_no_check = sk->sk_no_check;
6642 newsk->sk_reuse = sk->sk_reuse;
6643
6644 newsk->sk_shutdown = sk->sk_shutdown;
6645 newsk->sk_destruct = inet_sock_destruct;
6646 newsk->sk_family = sk->sk_family;
6647 newsk->sk_protocol = IPPROTO_SCTP;
6648 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
6649 newsk->sk_sndbuf = sk->sk_sndbuf;
6650 newsk->sk_rcvbuf = sk->sk_rcvbuf;
6651 newsk->sk_lingertime = sk->sk_lingertime;
6652 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
6653 newsk->sk_sndtimeo = sk->sk_sndtimeo;
6654
6655 newinet = inet_sk(newsk);
6656
6657 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6658 * getsockname() and getpeername()
6659 */
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006660 newinet->inet_sport = inet->inet_sport;
6661 newinet->inet_saddr = inet->inet_saddr;
6662 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
6663 newinet->inet_dport = htons(asoc->peer.port);
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006664 newinet->pmtudisc = inet->pmtudisc;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006665 newinet->inet_id = asoc->next_tsn ^ jiffies;
Vlad Yasevich914e1c82009-02-13 08:33:44 +00006666
6667 newinet->uc_ttl = inet->uc_ttl;
6668 newinet->mc_loop = 1;
6669 newinet->mc_ttl = 1;
6670 newinet->mc_index = 0;
6671 newinet->mc_list = NULL;
6672}
6673
Linus Torvalds1da177e2005-04-16 15:20:36 -07006674/* Populate the fields of the newsk from the oldsk and migrate the assoc
6675 * and its messages to the newsk.
6676 */
6677static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
6678 struct sctp_association *assoc,
6679 sctp_socket_type_t type)
6680{
6681 struct sctp_sock *oldsp = sctp_sk(oldsk);
6682 struct sctp_sock *newsp = sctp_sk(newsk);
6683 struct sctp_bind_bucket *pp; /* hash list port iterator */
6684 struct sctp_endpoint *newep = newsp->ep;
6685 struct sk_buff *skb, *tmp;
6686 struct sctp_ulpevent *event;
Vlad Yasevichf26f7c42007-12-06 22:50:27 -08006687 struct sctp_bind_hashbucket *head;
Michio Honda9f7d6532011-04-26 19:32:51 +09006688 struct list_head tmplist;
Linus Torvalds1da177e2005-04-16 15:20:36 -07006689
6690 /* Migrate socket buffer sizes and all the socket level options to the
6691 * new socket.
6692 */
6693 newsk->sk_sndbuf = oldsk->sk_sndbuf;
6694 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
6695 /* Brute force copy old sctp opt. */
Michio Honda9f7d6532011-04-26 19:32:51 +09006696 if (oldsp->do_auto_asconf) {
6697 memcpy(&tmplist, &newsp->auto_asconf_list, sizeof(tmplist));
6698 inet_sk_copy_descendant(newsk, oldsk);
6699 memcpy(&newsp->auto_asconf_list, &tmplist, sizeof(tmplist));
6700 } else
6701 inet_sk_copy_descendant(newsk, oldsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006702
6703 /* Restore the ep value that was overwritten with the above structure
6704 * copy.
6705 */
6706 newsp->ep = newep;
6707 newsp->hmac = NULL;
6708
6709 /* Hook this new socket in to the bind_hash list. */
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006710 head = &sctp_port_hashtable[sctp_phashfn(inet_sk(oldsk)->inet_num)];
Vlad Yasevichf26f7c42007-12-06 22:50:27 -08006711 sctp_local_bh_disable();
6712 sctp_spin_lock(&head->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006713 pp = sctp_sk(oldsk)->bind_hash;
6714 sk_add_bind_node(newsk, &pp->owner);
6715 sctp_sk(newsk)->bind_hash = pp;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00006716 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
Vlad Yasevichf26f7c42007-12-06 22:50:27 -08006717 sctp_spin_unlock(&head->lock);
6718 sctp_local_bh_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07006719
Vladislav Yasevich4243cac2005-06-13 15:10:49 -07006720 /* Copy the bind_addr list from the original endpoint to the new
6721 * endpoint so that we can handle restarts properly
6722 */
Vlad Yasevich8e71a112007-12-06 22:50:54 -08006723 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
6724 &oldsp->ep->base.bind_addr, GFP_KERNEL);
Vladislav Yasevich4243cac2005-06-13 15:10:49 -07006725
Linus Torvalds1da177e2005-04-16 15:20:36 -07006726 /* Move any messages in the old socket's receive queue that are for the
6727 * peeled off association to the new socket's receive queue.
6728 */
6729 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
6730 event = sctp_skb2event(skb);
6731 if (event->asoc == assoc) {
David S. Miller8728b832005-08-09 19:25:21 -07006732 __skb_unlink(skb, &oldsk->sk_receive_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006733 __skb_queue_tail(&newsk->sk_receive_queue, skb);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006734 sctp_skb_set_owner_r_frag(skb, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006735 }
6736 }
6737
6738 /* Clean up any messages pending delivery due to partial
6739 * delivery. Three cases:
6740 * 1) No partial deliver; no work.
6741 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6742 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6743 */
6744 skb_queue_head_init(&newsp->pd_lobby);
Vlad Yasevichb6e13312007-04-20 12:23:15 -07006745 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006746
Vlad Yasevichb6e13312007-04-20 12:23:15 -07006747 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07006748 struct sk_buff_head *queue;
6749
6750 /* Decide which queue to move pd_lobby skbs to. */
6751 if (assoc->ulpq.pd_mode) {
6752 queue = &newsp->pd_lobby;
6753 } else
6754 queue = &newsk->sk_receive_queue;
6755
6756 /* Walk through the pd_lobby, looking for skbs that
6757 * need moved to the new socket.
6758 */
6759 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
6760 event = sctp_skb2event(skb);
6761 if (event->asoc == assoc) {
David S. Miller8728b832005-08-09 19:25:21 -07006762 __skb_unlink(skb, &oldsp->pd_lobby);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006763 __skb_queue_tail(queue, skb);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006764 sctp_skb_set_owner_r_frag(skb, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006765 }
6766 }
6767
6768 /* Clear up any skbs waiting for the partial
6769 * delivery to finish.
6770 */
6771 if (assoc->ulpq.pd_mode)
Vlad Yasevichb6e13312007-04-20 12:23:15 -07006772 sctp_clear_pd(oldsk, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006773
6774 }
6775
Wei Yongjun1bc4ee42009-07-05 19:45:48 +00006776 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006777 sctp_skb_set_owner_r_frag(skb, newsk);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006778
Wei Yongjun1bc4ee42009-07-05 19:45:48 +00006779 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006780 sctp_skb_set_owner_r_frag(skb, newsk);
Tsutomu Fujiiea2bc482007-04-17 12:49:53 -07006781
Linus Torvalds1da177e2005-04-16 15:20:36 -07006782 /* Set the type of socket to indicate that it is peeled off from the
6783 * original UDP-style socket or created with the accept() call on a
6784 * TCP-style socket..
6785 */
6786 newsp->type = type;
6787
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07006788 /* Mark the new socket "in-use" by the user so that any packets
6789 * that may arrive on the association after we've moved it are
6790 * queued to the backlog. This prevents a potential race between
6791 * backlog processing on the old socket and new-packet processing
6792 * on the new socket.
Zach Brown5131a182007-06-22 15:14:46 -07006793 *
6794 * The caller has just allocated newsk so we can guarantee that other
6795 * paths won't try to lock it and then oldsk.
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07006796 */
Zach Brown5131a182007-06-22 15:14:46 -07006797 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006798 sctp_assoc_migrate(assoc, newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006799
6800 /* If the association on the newsk is already closed before accept()
6801 * is called, set RCV_SHUTDOWN flag.
6802 */
6803 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
6804 newsk->sk_shutdown |= RCV_SHUTDOWN;
6805
6806 newsk->sk_state = SCTP_SS_ESTABLISHED;
Vladislav Yasevich61c9fed2006-05-19 11:01:18 -07006807 sctp_release_sock(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07006808}
6809
Neil Horman4d93df02007-08-15 16:07:44 -07006810
Linus Torvalds1da177e2005-04-16 15:20:36 -07006811/* This proto struct describes the ULP interface for SCTP. */
6812struct proto sctp_prot = {
6813 .name = "SCTP",
6814 .owner = THIS_MODULE,
6815 .close = sctp_close,
6816 .connect = sctp_connect,
6817 .disconnect = sctp_disconnect,
6818 .accept = sctp_accept,
6819 .ioctl = sctp_ioctl,
6820 .init = sctp_init_sock,
6821 .destroy = sctp_destroy_sock,
6822 .shutdown = sctp_shutdown,
6823 .setsockopt = sctp_setsockopt,
6824 .getsockopt = sctp_getsockopt,
6825 .sendmsg = sctp_sendmsg,
6826 .recvmsg = sctp_recvmsg,
6827 .bind = sctp_bind,
6828 .backlog_rcv = sctp_backlog_rcv,
6829 .hash = sctp_hash,
6830 .unhash = sctp_unhash,
6831 .get_port = sctp_get_port,
6832 .obj_size = sizeof(struct sctp_sock),
Neil Horman4d93df02007-08-15 16:07:44 -07006833 .sysctl_mem = sysctl_sctp_mem,
6834 .sysctl_rmem = sysctl_sctp_rmem,
6835 .sysctl_wmem = sysctl_sctp_wmem,
6836 .memory_pressure = &sctp_memory_pressure,
6837 .enter_memory_pressure = sctp_enter_memory_pressure,
6838 .memory_allocated = &sctp_memory_allocated,
Pavel Emelyanov5f318862008-02-20 00:23:01 -08006839 .sockets_allocated = &sctp_sockets_allocated,
Linus Torvalds1da177e2005-04-16 15:20:36 -07006840};
6841
Eric Dumazetdfd56b82011-12-10 09:48:31 +00006842#if IS_ENABLED(CONFIG_IPV6)
Eric Dumazet8295b6d2007-11-05 23:40:28 -08006843
Linus Torvalds1da177e2005-04-16 15:20:36 -07006844struct proto sctpv6_prot = {
6845 .name = "SCTPv6",
6846 .owner = THIS_MODULE,
6847 .close = sctp_close,
6848 .connect = sctp_connect,
6849 .disconnect = sctp_disconnect,
6850 .accept = sctp_accept,
6851 .ioctl = sctp_ioctl,
6852 .init = sctp_init_sock,
6853 .destroy = sctp_destroy_sock,
6854 .shutdown = sctp_shutdown,
6855 .setsockopt = sctp_setsockopt,
6856 .getsockopt = sctp_getsockopt,
6857 .sendmsg = sctp_sendmsg,
6858 .recvmsg = sctp_recvmsg,
6859 .bind = sctp_bind,
6860 .backlog_rcv = sctp_backlog_rcv,
6861 .hash = sctp_hash,
6862 .unhash = sctp_unhash,
6863 .get_port = sctp_get_port,
6864 .obj_size = sizeof(struct sctp6_sock),
Neil Horman4d93df02007-08-15 16:07:44 -07006865 .sysctl_mem = sysctl_sctp_mem,
6866 .sysctl_rmem = sysctl_sctp_rmem,
6867 .sysctl_wmem = sysctl_sctp_wmem,
6868 .memory_pressure = &sctp_memory_pressure,
6869 .enter_memory_pressure = sctp_enter_memory_pressure,
6870 .memory_allocated = &sctp_memory_allocated,
Pavel Emelyanov5f318862008-02-20 00:23:01 -08006871 .sockets_allocated = &sctp_sockets_allocated,
Linus Torvalds1da177e2005-04-16 15:20:36 -07006872};
Eric Dumazetdfd56b82011-12-10 09:48:31 +00006873#endif /* IS_ENABLED(CONFIG_IPV6) */