blob: d53ad11558c32ad13fb404e57a5e22f30bcc1022 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NET An implementation of the SOCKET network access protocol.
3 *
4 * Version: @(#)socket.c 1.1.93 18/02/95
5 *
6 * Authors: Orest Zborowski, <obz@Kodak.COM>
Jesper Juhl02c30a82005-05-05 16:16:16 -07007 * Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
9 *
10 * Fixes:
11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
12 * shutdown()
13 * Alan Cox : verify_area() fixes
14 * Alan Cox : Removed DDI
15 * Jonathan Kamens : SOCK_DGRAM reconnect bug
16 * Alan Cox : Moved a load of checks to the very
17 * top level.
18 * Alan Cox : Move address structures to/from user
19 * mode above the protocol layers.
20 * Rob Janssen : Allow 0 length sends.
21 * Alan Cox : Asynchronous I/O support (cribbed from the
22 * tty drivers).
23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
24 * Jeff Uphoff : Made max number of sockets command-line
25 * configurable.
26 * Matti Aarnio : Made the number of sockets dynamic,
27 * to be allocated when needed, and mr.
28 * Uphoff's max is used as max to be
29 * allowed to allocate.
30 * Linus : Argh. removed all the socket allocation
31 * altogether: it's in the inode now.
32 * Alan Cox : Made sock_alloc()/sock_release() public
33 * for NetROM and future kernel nfsd type
34 * stuff.
35 * Alan Cox : sendmsg/recvmsg basics.
36 * Tom Dyas : Export net symbols.
37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
38 * Alan Cox : Added thread locking to sys_* calls
39 * for sockets. May have errors at the
40 * moment.
41 * Kevin Buhr : Fixed the dumb errors in the above.
42 * Andi Kleen : Some small cleanups, optimizations,
43 * and fixed a copy_from_user() bug.
44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
Stephen Hemminger89bddce2006-09-01 00:19:31 -070045 * Tigran Aivazian : Made listen(2) backlog sanity checks
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 * protocol-independent
47 *
48 *
49 * This program is free software; you can redistribute it and/or
50 * modify it under the terms of the GNU General Public License
51 * as published by the Free Software Foundation; either version
52 * 2 of the License, or (at your option) any later version.
53 *
54 *
55 * This module is effectively the top level interface to the BSD socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -070056 * paradigm.
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 *
58 * Based upon Swansea University Computer Society NET3.039
59 */
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/socket.h>
63#include <linux/file.h>
64#include <linux/net.h>
65#include <linux/interrupt.h>
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -070066#include <linux/thread_info.h>
Stephen Hemminger55737fd2006-09-01 00:23:39 -070067#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <linux/netdevice.h>
69#include <linux/proc_fs.h>
70#include <linux/seq_file.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080071#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#include <linux/wanrouter.h>
73#include <linux/if_bridge.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030074#include <linux/if_frad.h>
75#include <linux/if_vlan.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#include <linux/init.h>
77#include <linux/poll.h>
78#include <linux/cache.h>
79#include <linux/module.h>
80#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#include <linux/mount.h>
82#include <linux/security.h>
83#include <linux/syscalls.h>
84#include <linux/compat.h>
85#include <linux/kmod.h>
David Woodhouse3ec3b2f2005-05-17 12:08:48 +010086#include <linux/audit.h>
Adrian Bunkd86b5e02006-01-21 00:46:55 +010087#include <linux/wireless.h>
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -070088#include <linux/nsproxy.h>
Nick Black1fd7317d2009-09-22 16:43:33 -070089#include <linux/magic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91#include <asm/uaccess.h>
92#include <asm/unistd.h>
93
94#include <net/compat.h>
David S. Miller87de87d2008-06-03 09:14:03 -070095#include <net/wext.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97#include <net/sock.h>
98#include <linux/netfilter.h>
99
100static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
Badari Pulavarty027445c2006-09-30 23:28:46 -0700101static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
102 unsigned long nr_segs, loff_t pos);
103static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
104 unsigned long nr_segs, loff_t pos);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700105static int sock_mmap(struct file *file, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
107static int sock_close(struct inode *inode, struct file *file);
108static unsigned int sock_poll(struct file *file,
109 struct poll_table_struct *wait);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700110static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800111#ifdef CONFIG_COMPAT
112static long compat_sock_ioctl(struct file *file,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700113 unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800114#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115static int sock_fasync(int fd, struct file *filp, int on);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116static ssize_t sock_sendpage(struct file *file, struct page *page,
117 int offset, size_t size, loff_t *ppos, int more);
Jens Axboe9c55e012007-11-06 23:30:13 -0800118static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
119 struct pipe_inode_info *pipe, size_t len,
120 unsigned int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122/*
123 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
124 * in the operation structures but are done directly via the socketcall() multiplexor.
125 */
126
Arjan van de Venda7071d2007-02-12 00:55:36 -0800127static const struct file_operations socket_file_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 .owner = THIS_MODULE,
129 .llseek = no_llseek,
130 .aio_read = sock_aio_read,
131 .aio_write = sock_aio_write,
132 .poll = sock_poll,
133 .unlocked_ioctl = sock_ioctl,
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800134#ifdef CONFIG_COMPAT
135 .compat_ioctl = compat_sock_ioctl,
136#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 .mmap = sock_mmap,
138 .open = sock_no_open, /* special open code to disallow open via /proc */
139 .release = sock_close,
140 .fasync = sock_fasync,
Jens Axboe5274f052006-03-30 15:15:30 +0200141 .sendpage = sock_sendpage,
142 .splice_write = generic_splice_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800143 .splice_read = sock_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144};
145
146/*
147 * The protocol list. Each protocol is registered in here.
148 */
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150static DEFINE_SPINLOCK(net_family_lock);
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -0700151static const struct net_proto_family *net_families[NPROTO] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153/*
154 * Statistics counters of the socket lists
155 */
156
157static DEFINE_PER_CPU(int, sockets_in_use) = 0;
158
159/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700160 * Support routines.
161 * Move socket addresses back and forth across the kernel/user
162 * divide and look after the messy bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 */
164
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700165#define MAX_SOCK_ADDR 128 /* 108 for Unix domain -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 16 for IP, 16 for IPX,
167 24 for IPv6,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700168 about 80 for AX.25
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 must be at least one bigger than
170 the AF_UNIX size (see net/unix/af_unix.c
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700171 :unix_mkname()).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174/**
175 * move_addr_to_kernel - copy a socket address into kernel space
176 * @uaddr: Address in user space
177 * @kaddr: Address in kernel space
178 * @ulen: Length in user space
179 *
180 * The address is copied into kernel space. If the provided address is
181 * too long an error code of -EINVAL is returned. If the copy gives
182 * invalid addresses -EFAULT is returned. On a success 0 is returned.
183 */
184
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700185int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186{
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700187 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700189 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700191 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100193 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194}
195
196/**
197 * move_addr_to_user - copy an address to user space
198 * @kaddr: kernel space address
199 * @klen: length of address in kernel
200 * @uaddr: user space address
201 * @ulen: pointer to user length field
202 *
203 * The value pointed to by ulen on entry is the buffer length available.
204 * This is overwritten with the buffer space used. -EINVAL is returned
205 * if an overlong buffer is specified or a negative buffer size. -EFAULT
206 * is returned if either the buffer or the length field are not
207 * accessible.
208 * After copying the data up to the limit the user specifies, the true
209 * length of the data is written over the length limit the user
210 * specified. Zero is returned for a success.
211 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700212
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700213int move_addr_to_user(struct sockaddr *kaddr, int klen, void __user *uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700214 int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215{
216 int err;
217 int len;
218
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700219 err = get_user(len, ulen);
220 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700222 if (len > klen)
223 len = klen;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700224 if (len < 0 || len > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700226 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500227 if (audit_sockaddr(klen, kaddr))
228 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700229 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 return -EFAULT;
231 }
232 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700233 * "fromlen shall refer to the value before truncation.."
234 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 */
236 return __put_user(klen, ulen);
237}
238
Christoph Lametere18b8902006-12-06 20:33:20 -0800239static struct kmem_cache *sock_inode_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241static struct inode *sock_alloc_inode(struct super_block *sb)
242{
243 struct socket_alloc *ei;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700244
Christoph Lametere94b1762006-12-06 20:33:17 -0800245 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 if (!ei)
247 return NULL;
248 init_waitqueue_head(&ei->socket.wait);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 ei->socket.fasync_list = NULL;
251 ei->socket.state = SS_UNCONNECTED;
252 ei->socket.flags = 0;
253 ei->socket.ops = NULL;
254 ei->socket.sk = NULL;
255 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257 return &ei->vfs_inode;
258}
259
260static void sock_destroy_inode(struct inode *inode)
261{
262 kmem_cache_free(sock_inode_cachep,
263 container_of(inode, struct socket_alloc, vfs_inode));
264}
265
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700266static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700268 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
Christoph Lametera35afb82007-05-16 22:10:57 -0700270 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273static int init_inodecache(void)
274{
275 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700276 sizeof(struct socket_alloc),
277 0,
278 (SLAB_HWCACHE_ALIGN |
279 SLAB_RECLAIM_ACCOUNT |
280 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900281 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 if (sock_inode_cachep == NULL)
283 return -ENOMEM;
284 return 0;
285}
286
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700287static const struct super_operations sockfs_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 .alloc_inode = sock_alloc_inode,
289 .destroy_inode =sock_destroy_inode,
290 .statfs = simple_statfs,
291};
292
David Howells454e2392006-06-23 02:02:57 -0700293static int sockfs_get_sb(struct file_system_type *fs_type,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700294 int flags, const char *dev_name, void *data,
295 struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
David Howells454e2392006-06-23 02:02:57 -0700297 return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC,
298 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299}
300
Eric Dumazetba899662005-08-26 12:05:31 -0700301static struct vfsmount *sock_mnt __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
303static struct file_system_type sock_fs_type = {
304 .name = "sockfs",
305 .get_sb = sockfs_get_sb,
306 .kill_sb = kill_anon_super,
307};
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700308
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309static int sockfs_delete_dentry(struct dentry *dentry)
310{
Eric Dumazet304e61e2006-12-06 20:38:49 -0800311 /*
312 * At creation time, we pretended this dentry was hashed
313 * (by clearing DCACHE_UNHASHED bit in d_flags)
314 * At delete time, we restore the truth : not hashed.
315 * (so that dput() can proceed correctly)
316 */
317 dentry->d_flags |= DCACHE_UNHASHED;
318 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319}
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700320
321/*
322 * sockfs_dname() is called from d_path().
323 */
324static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
325{
326 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
327 dentry->d_inode->i_ino);
328}
329
Al Viro3ba13d12009-02-20 06:02:22 +0000330static const struct dentry_operations sockfs_dentry_operations = {
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700331 .d_delete = sockfs_delete_dentry,
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700332 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333};
334
335/*
336 * Obtains the first available file descriptor and sets it up for use.
337 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800338 * These functions create file structures and maps them to fd space
339 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 * and file struct implicitly stored in sock->file.
341 * Note that another thread may close file descriptor before we return
342 * from this function. We use the fact that now we do not refer
343 * to socket after mapping. If one day we will need it, this
344 * function will increment ref. count on file by 1.
345 *
346 * In any case returned fd MAY BE not valid!
347 * This race condition is unavoidable
348 * with shared fd spaces, we cannot solve it inside kernel,
349 * but we take care of internal coherence yet.
350 */
351
Ulrich Dreppera677a032008-07-23 21:29:17 -0700352static int sock_alloc_fd(struct file **filep, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353{
354 int fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800355
Ulrich Dreppera677a032008-07-23 21:29:17 -0700356 fd = get_unused_fd_flags(flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800357 if (likely(fd >= 0)) {
358 struct file *file = get_empty_filp();
359
360 *filep = file;
361 if (unlikely(!file)) {
362 put_unused_fd(fd);
363 return -ENFILE;
364 }
365 } else
366 *filep = NULL;
367 return fd;
368}
369
Ulrich Drepper77d27202008-07-23 21:29:35 -0700370static int sock_attach_fd(struct socket *sock, struct file *file, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800371{
Dave Hansence8d2cd2007-10-16 23:31:13 -0700372 struct dentry *dentry;
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700373 struct qstr name = { .name = "" };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
Dave Hansence8d2cd2007-10-16 23:31:13 -0700375 dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name);
376 if (unlikely(!dentry))
David S. Miller39d8c1b2006-03-20 17:13:49 -0800377 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Dave Hansence8d2cd2007-10-16 23:31:13 -0700379 dentry->d_op = &sockfs_dentry_operations;
Eric Dumazet304e61e2006-12-06 20:38:49 -0800380 /*
381 * We dont want to push this dentry into global dentry hash table.
382 * We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED
383 * This permits a working /proc/$pid/fd/XXX on sockets
384 */
Dave Hansence8d2cd2007-10-16 23:31:13 -0700385 dentry->d_flags &= ~DCACHE_UNHASHED;
386 d_instantiate(dentry, SOCK_INODE(sock));
David S. Miller39d8c1b2006-03-20 17:13:49 -0800387
388 sock->file = file;
Dave Hansence8d2cd2007-10-16 23:31:13 -0700389 init_file(file, sock_mnt, dentry, FMODE_READ | FMODE_WRITE,
390 &socket_file_ops);
391 SOCK_INODE(sock)->i_fop = &socket_file_ops;
Ulrich Drepper77d27202008-07-23 21:29:35 -0700392 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800393 file->f_pos = 0;
394 file->private_data = sock;
395
396 return 0;
397}
398
Ulrich Dreppera677a032008-07-23 21:29:17 -0700399int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800400{
401 struct file *newfile;
Ulrich Dreppera677a032008-07-23 21:29:17 -0700402 int fd = sock_alloc_fd(&newfile, flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800403
404 if (likely(fd >= 0)) {
Ulrich Drepper77d27202008-07-23 21:29:35 -0700405 int err = sock_attach_fd(sock, newfile, flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800406
407 if (unlikely(err < 0)) {
408 put_filp(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 put_unused_fd(fd);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800410 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800412 fd_install(fd, newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 return fd;
415}
416
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800417static struct socket *sock_from_file(struct file *file, int *err)
418{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800419 if (file->f_op == &socket_file_ops)
420 return file->private_data; /* set in sock_map_fd */
421
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800422 *err = -ENOTSOCK;
423 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800424}
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426/**
427 * sockfd_lookup - Go from a file number to its socket slot
428 * @fd: file handle
429 * @err: pointer to an error code return
430 *
431 * The file handle passed in is locked and the socket it is bound
432 * too is returned. If an error occurs the err pointer is overwritten
433 * with a negative errno code and NULL is returned. The function checks
434 * for both invalid handles and passing a handle which is not a socket.
435 *
436 * On a success the socket object pointer is returned.
437 */
438
439struct socket *sockfd_lookup(int fd, int *err)
440{
441 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 struct socket *sock;
443
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700444 file = fget(fd);
445 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 *err = -EBADF;
447 return NULL;
448 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700449
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800450 sock = sock_from_file(file, err);
451 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 return sock;
454}
455
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800456static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
457{
458 struct file *file;
459 struct socket *sock;
460
Hua Zhong36725582006-04-19 15:25:02 -0700461 *err = -EBADF;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800462 file = fget_light(fd, fput_needed);
463 if (file) {
464 sock = sock_from_file(file, err);
465 if (sock)
466 return sock;
467 fput_light(file, *fput_needed);
468 }
469 return NULL;
470}
471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472/**
473 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700474 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 * Allocate a new inode and socket object. The two are bound together
476 * and initialised. The socket is then returned. If we are out of inodes
477 * NULL is returned.
478 */
479
480static struct socket *sock_alloc(void)
481{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700482 struct inode *inode;
483 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
485 inode = new_inode(sock_mnt->mnt_sb);
486 if (!inode)
487 return NULL;
488
489 sock = SOCKET_I(inode);
490
Eric Dumazet29a020d2009-09-15 02:39:20 -0700491 kmemcheck_annotate_bitfield(sock, type);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700492 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100493 inode->i_uid = current_fsuid();
494 inode->i_gid = current_fsgid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
Eric Dumazet4e694892009-04-04 16:41:09 -0700496 percpu_add(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 return sock;
498}
499
500/*
501 * In theory you can't get an open on this inode, but /proc provides
502 * a back door. Remember to keep it shut otherwise you'll let the
503 * creepy crawlies in.
504 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700505
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
507{
508 return -ENXIO;
509}
510
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800511const struct file_operations bad_sock_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 .owner = THIS_MODULE,
513 .open = sock_no_open,
514};
515
516/**
517 * sock_release - close a socket
518 * @sock: socket to close
519 *
520 * The socket is released from the protocol stack if it has a release
521 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700522 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525void sock_release(struct socket *sock)
526{
527 if (sock->ops) {
528 struct module *owner = sock->ops->owner;
529
530 sock->ops->release(sock);
531 sock->ops = NULL;
532 module_put(owner);
533 }
534
535 if (sock->fasync_list)
536 printk(KERN_ERR "sock_release: fasync list not empty!\n");
537
Eric Dumazet4e694892009-04-04 16:41:09 -0700538 percpu_sub(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 if (!sock->file) {
540 iput(SOCK_INODE(sock));
541 return;
542 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700543 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544}
545
Patrick Ohly20d49472009-02-12 05:03:38 +0000546int sock_tx_timestamp(struct msghdr *msg, struct sock *sk,
547 union skb_shared_tx *shtx)
548{
549 shtx->flags = 0;
550 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
551 shtx->hardware = 1;
552 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
553 shtx->software = 1;
554 return 0;
555}
556EXPORT_SYMBOL(sock_tx_timestamp);
557
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700558static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 struct msghdr *msg, size_t size)
560{
561 struct sock_iocb *si = kiocb_to_siocb(iocb);
562 int err;
563
564 si->sock = sock;
565 si->scm = NULL;
566 si->msg = msg;
567 si->size = size;
568
569 err = security_socket_sendmsg(sock, msg, size);
570 if (err)
571 return err;
572
573 return sock->ops->sendmsg(iocb, sock, msg, size);
574}
575
576int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
577{
578 struct kiocb iocb;
579 struct sock_iocb siocb;
580 int ret;
581
582 init_sync_kiocb(&iocb, NULL);
583 iocb.private = &siocb;
584 ret = __sock_sendmsg(&iocb, sock, msg, size);
585 if (-EIOCBQUEUED == ret)
586 ret = wait_on_sync_kiocb(&iocb);
587 return ret;
588}
589
590int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
591 struct kvec *vec, size_t num, size_t size)
592{
593 mm_segment_t oldfs = get_fs();
594 int result;
595
596 set_fs(KERNEL_DS);
597 /*
598 * the following is safe, since for compiler definitions of kvec and
599 * iovec are identical, yielding the same in-core layout and alignment
600 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700601 msg->msg_iov = (struct iovec *)vec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 msg->msg_iovlen = num;
603 result = sock_sendmsg(sock, msg, size);
604 set_fs(oldfs);
605 return result;
606}
607
Patrick Ohly20d49472009-02-12 05:03:38 +0000608static int ktime2ts(ktime_t kt, struct timespec *ts)
609{
610 if (kt.tv64) {
611 *ts = ktime_to_timespec(kt);
612 return 1;
613 } else {
614 return 0;
615 }
616}
617
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700618/*
619 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
620 */
621void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
622 struct sk_buff *skb)
623{
Patrick Ohly20d49472009-02-12 05:03:38 +0000624 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
625 struct timespec ts[3];
626 int empty = 1;
627 struct skb_shared_hwtstamps *shhwtstamps =
628 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700629
Patrick Ohly20d49472009-02-12 05:03:38 +0000630 /* Race occurred between timestamp enabling and packet
631 receiving. Fill in the current time for now. */
632 if (need_software_tstamp && skb->tstamp.tv64 == 0)
633 __net_timestamp(skb);
634
635 if (need_software_tstamp) {
636 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
637 struct timeval tv;
638 skb_get_timestamp(skb, &tv);
639 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
640 sizeof(tv), &tv);
641 } else {
642 struct timespec ts;
643 skb_get_timestampns(skb, &ts);
644 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
645 sizeof(ts), &ts);
646 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700647 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000648
649
650 memset(ts, 0, sizeof(ts));
651 if (skb->tstamp.tv64 &&
652 sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) {
653 skb_get_timestampns(skb, ts + 0);
654 empty = 0;
655 }
656 if (shhwtstamps) {
657 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
658 ktime2ts(shhwtstamps->syststamp, ts + 1))
659 empty = 0;
660 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
661 ktime2ts(shhwtstamps->hwtstamp, ts + 2))
662 empty = 0;
663 }
664 if (!empty)
665 put_cmsg(msg, SOL_SOCKET,
666 SCM_TIMESTAMPING, sizeof(ts), &ts);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700667}
668
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300669EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
670
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700671static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 struct msghdr *msg, size_t size, int flags)
673{
674 int err;
675 struct sock_iocb *si = kiocb_to_siocb(iocb);
676
677 si->sock = sock;
678 si->scm = NULL;
679 si->msg = msg;
680 si->size = size;
681 si->flags = flags;
682
683 err = security_socket_recvmsg(sock, msg, size, flags);
684 if (err)
685 return err;
686
687 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
688}
689
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700690int sock_recvmsg(struct socket *sock, struct msghdr *msg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 size_t size, int flags)
692{
693 struct kiocb iocb;
694 struct sock_iocb siocb;
695 int ret;
696
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700697 init_sync_kiocb(&iocb, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 iocb.private = &siocb;
699 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
700 if (-EIOCBQUEUED == ret)
701 ret = wait_on_sync_kiocb(&iocb);
702 return ret;
703}
704
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700705int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
706 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707{
708 mm_segment_t oldfs = get_fs();
709 int result;
710
711 set_fs(KERNEL_DS);
712 /*
713 * the following is safe, since for compiler definitions of kvec and
714 * iovec are identical, yielding the same in-core layout and alignment
715 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700716 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 result = sock_recvmsg(sock, msg, size, flags);
718 set_fs(oldfs);
719 return result;
720}
721
722static void sock_aio_dtor(struct kiocb *iocb)
723{
724 kfree(iocb->private);
725}
726
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300727static ssize_t sock_sendpage(struct file *file, struct page *page,
728 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729{
730 struct socket *sock;
731 int flags;
732
Eric Dumazetb69aee02005-09-06 14:42:45 -0700733 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
735 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
736 if (more)
737 flags |= MSG_MORE;
738
Linus Torvaldse6949582009-08-13 08:28:36 -0700739 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740}
741
Jens Axboe9c55e012007-11-06 23:30:13 -0800742static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
743 struct pipe_inode_info *pipe, size_t len,
744 unsigned int flags)
745{
746 struct socket *sock = file->private_data;
747
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800748 if (unlikely(!sock->ops->splice_read))
749 return -EINVAL;
750
Jens Axboe9c55e012007-11-06 23:30:13 -0800751 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
752}
753
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800754static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700755 struct sock_iocb *siocb)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800756{
757 if (!is_sync_kiocb(iocb)) {
758 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
759 if (!siocb)
760 return NULL;
761 iocb->ki_dtor = sock_aio_dtor;
762 }
763
764 siocb->kiocb = iocb;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800765 iocb->private = siocb;
766 return siocb;
767}
768
769static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700770 struct file *file, const struct iovec *iov,
771 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800772{
773 struct socket *sock = file->private_data;
774 size_t size = 0;
775 int i;
776
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700777 for (i = 0; i < nr_segs; i++)
778 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800779
780 msg->msg_name = NULL;
781 msg->msg_namelen = 0;
782 msg->msg_control = NULL;
783 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700784 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800785 msg->msg_iovlen = nr_segs;
786 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
787
788 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
789}
790
Badari Pulavarty027445c2006-09-30 23:28:46 -0700791static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
792 unsigned long nr_segs, loff_t pos)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800793{
794 struct sock_iocb siocb, *x;
795
796 if (pos != 0)
797 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700798
799 if (iocb->ki_left == 0) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800800 return 0;
801
Badari Pulavarty027445c2006-09-30 23:28:46 -0700802
803 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800804 if (!x)
805 return -ENOMEM;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700806 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800807}
808
809static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700810 struct file *file, const struct iovec *iov,
811 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800812{
813 struct socket *sock = file->private_data;
814 size_t size = 0;
815 int i;
816
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700817 for (i = 0; i < nr_segs; i++)
818 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800819
820 msg->msg_name = NULL;
821 msg->msg_namelen = 0;
822 msg->msg_control = NULL;
823 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700824 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800825 msg->msg_iovlen = nr_segs;
826 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
827 if (sock->type == SOCK_SEQPACKET)
828 msg->msg_flags |= MSG_EOR;
829
830 return __sock_sendmsg(iocb, sock, msg, size);
831}
832
Badari Pulavarty027445c2006-09-30 23:28:46 -0700833static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
834 unsigned long nr_segs, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835{
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800836 struct sock_iocb siocb, *x;
837
838 if (pos != 0)
839 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700840
Badari Pulavarty027445c2006-09-30 23:28:46 -0700841 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800842 if (!x)
843 return -ENOMEM;
844
Badari Pulavarty027445c2006-09-30 23:28:46 -0700845 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846}
847
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848/*
849 * Atomic setting of ioctl hooks to avoid race
850 * with module unload.
851 */
852
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800853static DEFINE_MUTEX(br_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700854static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg) = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855
Eric W. Biederman881d9662007-09-17 11:56:21 -0700856void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800858 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800860 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700862
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863EXPORT_SYMBOL(brioctl_set);
864
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800865static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700866static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
Eric W. Biederman881d9662007-09-17 11:56:21 -0700868void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800870 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800872 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700874
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875EXPORT_SYMBOL(vlan_ioctl_set);
876
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800877static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700878static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700880void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800882 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800884 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700886
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887EXPORT_SYMBOL(dlci_ioctl_set);
888
889/*
890 * With an ioctl, arg may well be a user mode pointer, but we don't know
891 * what to do with it - that's up to the protocol still.
892 */
893
894static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
895{
896 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700897 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 void __user *argp = (void __user *)arg;
899 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700900 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
Eric Dumazetb69aee02005-09-06 14:42:45 -0700902 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700903 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900904 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700906 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 } else
Adrian Bunkd86b5e02006-01-21 00:46:55 +0100908#ifdef CONFIG_WIRELESS_EXT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700910 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 } else
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700912#endif /* CONFIG_WIRELESS_EXT */
913 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 case FIOSETOWN:
915 case SIOCSPGRP:
916 err = -EFAULT;
917 if (get_user(pid, (int __user *)argp))
918 break;
919 err = f_setown(sock->file, pid, 1);
920 break;
921 case FIOGETOWN:
922 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700923 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700924 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 break;
926 case SIOCGIFBR:
927 case SIOCSIFBR:
928 case SIOCBRADDBR:
929 case SIOCBRDELBR:
930 err = -ENOPKG;
931 if (!br_ioctl_hook)
932 request_module("bridge");
933
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800934 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700935 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700936 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800937 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 break;
939 case SIOCGIFVLAN:
940 case SIOCSIFVLAN:
941 err = -ENOPKG;
942 if (!vlan_ioctl_hook)
943 request_module("8021q");
944
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800945 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700947 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800948 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 case SIOCADDDLCI:
951 case SIOCDELDLCI:
952 err = -ENOPKG;
953 if (!dlci_ioctl_hook)
954 request_module("dlci");
955
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -0700956 mutex_lock(&dlci_ioctl_mutex);
957 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -0700959 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 break;
961 default:
962 err = sock->ops->ioctl(sock, cmd, arg);
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -0800963
964 /*
965 * If this ioctl is unknown try to hand it down
966 * to the NIC driver.
967 */
968 if (err == -ENOIOCTLCMD)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700969 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700971 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 return err;
973}
974
975int sock_create_lite(int family, int type, int protocol, struct socket **res)
976{
977 int err;
978 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700979
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 err = security_socket_create(family, type, protocol, 1);
981 if (err)
982 goto out;
983
984 sock = sock_alloc();
985 if (!sock) {
986 err = -ENOMEM;
987 goto out;
988 }
989
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -0700991 err = security_socket_post_create(sock, family, type, protocol, 1);
992 if (err)
993 goto out_release;
994
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995out:
996 *res = sock;
997 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -0700998out_release:
999 sock_release(sock);
1000 sock = NULL;
1001 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002}
1003
1004/* No kernel lock held - perfect */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001005static unsigned int sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006{
1007 struct socket *sock;
1008
1009 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001010 * We can't return errors to poll, so it's either yes or no.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 */
Eric Dumazetb69aee02005-09-06 14:42:45 -07001012 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 return sock->ops->poll(file, sock, wait);
1014}
1015
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001016static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001018 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019
1020 return sock->ops->mmap(file, sock, vma);
1021}
1022
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001023static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024{
1025 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001026 * It was possible the inode is NULL we were
1027 * closing an unfinished socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 */
1029
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001030 if (!inode) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 printk(KERN_DEBUG "sock_close: NULL inode\n");
1032 return 0;
1033 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 sock_release(SOCKET_I(inode));
1035 return 0;
1036}
1037
1038/*
1039 * Update the socket async list
1040 *
1041 * Fasync_list locking strategy.
1042 *
1043 * 1. fasync_list is modified only under process context socket lock
1044 * i.e. under semaphore.
1045 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1046 * or under socket lock.
1047 * 3. fasync_list can be used from softirq context, so that
1048 * modification under socket lock have to be enhanced with
1049 * write_lock_bh(&sk->sk_callback_lock).
1050 * --ANK (990710)
1051 */
1052
1053static int sock_fasync(int fd, struct file *filp, int on)
1054{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001055 struct fasync_struct *fa, *fna = NULL, **prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 struct socket *sock;
1057 struct sock *sk;
1058
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001059 if (on) {
Kris Katterjohn8b3a7002006-01-11 15:56:43 -08001060 fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001061 if (fna == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 return -ENOMEM;
1063 }
1064
Eric Dumazetb69aee02005-09-06 14:42:45 -07001065 sock = filp->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001067 sk = sock->sk;
1068 if (sk == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 kfree(fna);
1070 return -EINVAL;
1071 }
1072
1073 lock_sock(sk);
1074
Jonathan Corbet76398422009-02-01 14:26:59 -07001075 spin_lock(&filp->f_lock);
1076 if (on)
1077 filp->f_flags |= FASYNC;
1078 else
1079 filp->f_flags &= ~FASYNC;
1080 spin_unlock(&filp->f_lock);
1081
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001082 prev = &(sock->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001084 for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev)
1085 if (fa->fa_file == filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 break;
1087
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001088 if (on) {
1089 if (fa != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 write_lock_bh(&sk->sk_callback_lock);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001091 fa->fa_fd = fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 write_unlock_bh(&sk->sk_callback_lock);
1093
1094 kfree(fna);
1095 goto out;
1096 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001097 fna->fa_file = filp;
1098 fna->fa_fd = fd;
1099 fna->magic = FASYNC_MAGIC;
1100 fna->fa_next = sock->fasync_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 write_lock_bh(&sk->sk_callback_lock);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001102 sock->fasync_list = fna;
Eric Dumazetbcdce712009-10-06 17:28:29 -07001103 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 write_unlock_bh(&sk->sk_callback_lock);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001105 } else {
1106 if (fa != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 write_lock_bh(&sk->sk_callback_lock);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001108 *prev = fa->fa_next;
Eric Dumazetbcdce712009-10-06 17:28:29 -07001109 if (!sock->fasync_list)
1110 sock_reset_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 write_unlock_bh(&sk->sk_callback_lock);
1112 kfree(fa);
1113 }
1114 }
1115
1116out:
1117 release_sock(sock->sk);
1118 return 0;
1119}
1120
1121/* This function may be called only under socket lock or callback_lock */
1122
1123int sock_wake_async(struct socket *sock, int how, int band)
1124{
1125 if (!sock || !sock->fasync_list)
1126 return -1;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001127 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001128 case SOCK_WAKE_WAITD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1130 break;
1131 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001132 case SOCK_WAKE_SPACE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1134 break;
1135 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001136 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001137call_kill:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 __kill_fasync(sock->fasync_list, SIGIO, band);
1139 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001140 case SOCK_WAKE_URG:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 __kill_fasync(sock->fasync_list, SIGURG, band);
1142 }
1143 return 0;
1144}
1145
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001146static int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001147 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148{
1149 int err;
1150 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001151 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152
1153 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001154 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 */
1156 if (family < 0 || family >= NPROTO)
1157 return -EAFNOSUPPORT;
1158 if (type < 0 || type >= SOCK_MAX)
1159 return -EINVAL;
1160
1161 /* Compatibility.
1162
1163 This uglymoron is moved from INET layer to here to avoid
1164 deadlock in module load.
1165 */
1166 if (family == PF_INET && type == SOCK_PACKET) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001167 static int warned;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 if (!warned) {
1169 warned = 1;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001170 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1171 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 }
1173 family = PF_PACKET;
1174 }
1175
1176 err = security_socket_create(family, type, protocol, kern);
1177 if (err)
1178 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001179
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001180 /*
1181 * Allocate the socket and allow the family to set things up. if
1182 * the protocol is 0, the family is instructed to select an appropriate
1183 * default.
1184 */
1185 sock = sock_alloc();
1186 if (!sock) {
1187 if (net_ratelimit())
1188 printk(KERN_WARNING "socket: no more sockets\n");
1189 return -ENFILE; /* Not exactly a match, but its the
1190 closest posix thing */
1191 }
1192
1193 sock->type = type;
1194
Johannes Berg95a5afc2008-10-16 15:24:51 -07001195#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001196 /* Attempt to load a protocol module if the find failed.
1197 *
1198 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 * requested real, full-featured networking support upon configuration.
1200 * Otherwise module support will break!
1201 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001202 if (net_families[family] == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001203 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204#endif
1205
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001206 rcu_read_lock();
1207 pf = rcu_dereference(net_families[family]);
1208 err = -EAFNOSUPPORT;
1209 if (!pf)
1210 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211
1212 /*
1213 * We will call the ->create function, that possibly is in a loadable
1214 * module, so we have to bump that loadable module refcnt first.
1215 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001216 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 goto out_release;
1218
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001219 /* Now protected by module ref count */
1220 rcu_read_unlock();
1221
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001222 err = pf->create(net, sock, protocol);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001223 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001225
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 /*
1227 * Now to bump the refcnt of the [loadable] module that owns this
1228 * socket at sock_release time we decrement its refcnt.
1229 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001230 if (!try_module_get(sock->ops->owner))
1231 goto out_module_busy;
1232
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 /*
1234 * Now that we're done with the ->create function, the [loadable]
1235 * module can have its refcnt decremented
1236 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001237 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001238 err = security_socket_post_create(sock, family, type, protocol, kern);
1239 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001240 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001241 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001243 return 0;
1244
1245out_module_busy:
1246 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001248 sock->ops = NULL;
1249 module_put(pf->owner);
1250out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001252 return err;
1253
1254out_release:
1255 rcu_read_unlock();
1256 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257}
1258
1259int sock_create(int family, int type, int protocol, struct socket **res)
1260{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001261 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262}
1263
1264int sock_create_kern(int family, int type, int protocol, struct socket **res)
1265{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001266 return __sock_create(&init_net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267}
1268
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001269SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270{
1271 int retval;
1272 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001273 int flags;
1274
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001275 /* Check the SOCK_* constants for consistency. */
1276 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1277 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1278 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1279 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1280
Ulrich Dreppera677a032008-07-23 21:29:17 -07001281 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001282 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001283 return -EINVAL;
1284 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001286 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1287 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1288
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 retval = sock_create(family, type, protocol, &sock);
1290 if (retval < 0)
1291 goto out;
1292
Ulrich Drepper77d27202008-07-23 21:29:35 -07001293 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 if (retval < 0)
1295 goto out_release;
1296
1297out:
1298 /* It may be already another descriptor 8) Not kernel problem. */
1299 return retval;
1300
1301out_release:
1302 sock_release(sock);
1303 return retval;
1304}
1305
1306/*
1307 * Create a pair of connected sockets.
1308 */
1309
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001310SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1311 int __user *, usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312{
1313 struct socket *sock1, *sock2;
1314 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001315 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001316 int flags;
1317
1318 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001319 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001320 return -EINVAL;
1321 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001323 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1324 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1325
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 /*
1327 * Obtain the first socket and check if the underlying protocol
1328 * supports the socketpair call.
1329 */
1330
1331 err = sock_create(family, type, protocol, &sock1);
1332 if (err < 0)
1333 goto out;
1334
1335 err = sock_create(family, type, protocol, &sock2);
1336 if (err < 0)
1337 goto out_release_1;
1338
1339 err = sock1->ops->socketpair(sock1, sock2);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001340 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 goto out_release_both;
1342
Ulrich Dreppera677a032008-07-23 21:29:17 -07001343 fd1 = sock_alloc_fd(&newfile1, flags & O_CLOEXEC);
David S. Millerbf3c23d2007-10-29 21:54:02 -07001344 if (unlikely(fd1 < 0)) {
1345 err = fd1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 goto out_release_both;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001347 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348
Ulrich Dreppera677a032008-07-23 21:29:17 -07001349 fd2 = sock_alloc_fd(&newfile2, flags & O_CLOEXEC);
Al Virodb349502007-02-07 01:48:00 -05001350 if (unlikely(fd2 < 0)) {
David S. Millerbf3c23d2007-10-29 21:54:02 -07001351 err = fd2;
Al Virodb349502007-02-07 01:48:00 -05001352 put_filp(newfile1);
1353 put_unused_fd(fd1);
1354 goto out_release_both;
1355 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356
Ulrich Drepper77d27202008-07-23 21:29:35 -07001357 err = sock_attach_fd(sock1, newfile1, flags & O_NONBLOCK);
Al Virodb349502007-02-07 01:48:00 -05001358 if (unlikely(err < 0)) {
1359 goto out_fd2;
1360 }
1361
Ulrich Drepper77d27202008-07-23 21:29:35 -07001362 err = sock_attach_fd(sock2, newfile2, flags & O_NONBLOCK);
Al Virodb349502007-02-07 01:48:00 -05001363 if (unlikely(err < 0)) {
1364 fput(newfile1);
1365 goto out_fd1;
1366 }
1367
Al Viro157cf642008-12-14 04:57:47 -05001368 audit_fd_pair(fd1, fd2);
Al Virodb349502007-02-07 01:48:00 -05001369 fd_install(fd1, newfile1);
1370 fd_install(fd2, newfile2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 /* fd1 and fd2 may be already another descriptors.
1372 * Not kernel problem.
1373 */
1374
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001375 err = put_user(fd1, &usockvec[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 if (!err)
1377 err = put_user(fd2, &usockvec[1]);
1378 if (!err)
1379 return 0;
1380
1381 sys_close(fd2);
1382 sys_close(fd1);
1383 return err;
1384
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385out_release_both:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001386 sock_release(sock2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387out_release_1:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001388 sock_release(sock1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389out:
1390 return err;
Al Virodb349502007-02-07 01:48:00 -05001391
1392out_fd2:
1393 put_filp(newfile1);
1394 sock_release(sock1);
1395out_fd1:
1396 put_filp(newfile2);
1397 sock_release(sock2);
Al Virodb349502007-02-07 01:48:00 -05001398 put_unused_fd(fd1);
1399 put_unused_fd(fd2);
1400 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401}
1402
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403/*
1404 * Bind a name to a socket. Nothing much to do here since it's
1405 * the protocol's responsibility to handle the local address.
1406 *
1407 * We move the socket address to kernel space before we call
1408 * the protocol layer (having also checked the address is ok).
1409 */
1410
Heiko Carstens20f37032009-01-14 14:14:23 +01001411SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412{
1413 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001414 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001415 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001417 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001418 if (sock) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001419 err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001420 if (err >= 0) {
1421 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001422 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001423 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001424 if (!err)
1425 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001426 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001427 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001429 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001430 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 return err;
1432}
1433
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434/*
1435 * Perform a listen. Basically, we allow the protocol to do anything
1436 * necessary for a listen, and if that works, we mark the socket as
1437 * ready for listening.
1438 */
1439
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001440SYSCALL_DEFINE2(listen, int, fd, int, backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441{
1442 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001443 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001444 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001445
1446 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1447 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001448 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001449 if ((unsigned)backlog > somaxconn)
1450 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451
1452 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001453 if (!err)
1454 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001456 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 }
1458 return err;
1459}
1460
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461/*
1462 * For accept, we attempt to create a new socket, set up the link
1463 * with the client, wake up the client, then return the new
1464 * connected fd. We collect the address of the connector in kernel
1465 * space and move it to user at the very end. This is unclean because
1466 * we open the socket then return an error.
1467 *
1468 * 1003.1g adds the ability to recvmsg() to query connection pending
1469 * status to recvmsg. We need to add that support in a way thats
1470 * clean when we restucture accept also.
1471 */
1472
Heiko Carstens20f37032009-01-14 14:14:23 +01001473SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1474 int __user *, upeer_addrlen, int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475{
1476 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001477 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001478 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001479 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480
Ulrich Drepper77d27202008-07-23 21:29:35 -07001481 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001482 return -EINVAL;
1483
1484 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1485 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1486
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001487 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 if (!sock)
1489 goto out;
1490
1491 err = -ENFILE;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001492 if (!(newsock = sock_alloc()))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 goto out_put;
1494
1495 newsock->type = sock->type;
1496 newsock->ops = sock->ops;
1497
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 /*
1499 * We don't need try_module_get here, as the listening socket (sock)
1500 * has the protocol module (sock->ops->owner) held.
1501 */
1502 __module_get(newsock->ops->owner);
1503
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001504 newfd = sock_alloc_fd(&newfile, flags & O_CLOEXEC);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001505 if (unlikely(newfd < 0)) {
1506 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001507 sock_release(newsock);
1508 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001509 }
1510
Ulrich Drepper77d27202008-07-23 21:29:35 -07001511 err = sock_attach_fd(newsock, newfile, flags & O_NONBLOCK);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001512 if (err < 0)
Alexey Dobriyan79f4f642007-03-26 14:09:52 -07001513 goto out_fd_simple;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001514
Frank Filza79af592005-09-27 15:23:38 -07001515 err = security_socket_accept(sock, newsock);
1516 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001517 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001518
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1520 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001521 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522
1523 if (upeer_sockaddr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001524 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001525 &len, 2) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001527 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528 }
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001529 err = move_addr_to_user((struct sockaddr *)&address,
1530 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001532 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533 }
1534
1535 /* File flags are not inherited via accept() unlike another OSes. */
1536
David S. Miller39d8c1b2006-03-20 17:13:49 -08001537 fd_install(newfd, newfile);
1538 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001541 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542out:
1543 return err;
Alexey Dobriyan79f4f642007-03-26 14:09:52 -07001544out_fd_simple:
1545 sock_release(newsock);
1546 put_filp(newfile);
1547 put_unused_fd(newfd);
1548 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001549out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001550 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001551 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552 goto out_put;
1553}
1554
Heiko Carstens20f37032009-01-14 14:14:23 +01001555SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1556 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001557{
Ulrich Drepperde11def2008-11-19 15:36:14 -08001558 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001559}
1560
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561/*
1562 * Attempt to connect to a socket with the server address. The address
1563 * is in user space so we verify it is OK and move it to kernel space.
1564 *
1565 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1566 * break bindings
1567 *
1568 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1569 * other SEQPACKET protocols that take time to connect() as it doesn't
1570 * include the -EINPROGRESS status for such sockets.
1571 */
1572
Heiko Carstens20f37032009-01-14 14:14:23 +01001573SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1574 int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575{
1576 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001577 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001578 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001580 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 if (!sock)
1582 goto out;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001583 err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 if (err < 0)
1585 goto out_put;
1586
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001587 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001588 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589 if (err)
1590 goto out_put;
1591
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001592 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593 sock->file->f_flags);
1594out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001595 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596out:
1597 return err;
1598}
1599
1600/*
1601 * Get the local address ('name') of a socket object. Move the obtained
1602 * name to user space.
1603 */
1604
Heiko Carstens20f37032009-01-14 14:14:23 +01001605SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1606 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607{
1608 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001609 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001610 int len, err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001611
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001612 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 if (!sock)
1614 goto out;
1615
1616 err = security_socket_getsockname(sock);
1617 if (err)
1618 goto out_put;
1619
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001620 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 if (err)
1622 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001623 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624
1625out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001626 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627out:
1628 return err;
1629}
1630
1631/*
1632 * Get the remote address ('name') of a socket object. Move the obtained
1633 * name to user space.
1634 */
1635
Heiko Carstens20f37032009-01-14 14:14:23 +01001636SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1637 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638{
1639 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001640 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001641 int len, err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001643 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1644 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645 err = security_socket_getpeername(sock);
1646 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001647 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 return err;
1649 }
1650
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001651 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001652 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001653 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654 if (!err)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001655 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001656 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001657 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 }
1659 return err;
1660}
1661
1662/*
1663 * Send a datagram to a given address. We move the address into kernel
1664 * space and check the user space data area is readable before invoking
1665 * the protocol.
1666 */
1667
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001668SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1669 unsigned, flags, struct sockaddr __user *, addr,
1670 int, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671{
1672 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001673 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 int err;
1675 struct msghdr msg;
1676 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001677 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001678
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001679 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1680 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001681 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001682
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001683 iov.iov_base = buff;
1684 iov.iov_len = len;
1685 msg.msg_name = NULL;
1686 msg.msg_iov = &iov;
1687 msg.msg_iovlen = 1;
1688 msg.msg_control = NULL;
1689 msg.msg_controllen = 0;
1690 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001691 if (addr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001692 err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 if (err < 0)
1694 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001695 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001696 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 }
1698 if (sock->file->f_flags & O_NONBLOCK)
1699 flags |= MSG_DONTWAIT;
1700 msg.msg_flags = flags;
1701 err = sock_sendmsg(sock, &msg, len);
1702
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001703out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001704 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001705out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706 return err;
1707}
1708
1709/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001710 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711 */
1712
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001713SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1714 unsigned, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715{
1716 return sys_sendto(fd, buff, len, flags, NULL, 0);
1717}
1718
1719/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001720 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721 * sender. We verify the buffers are writable and if needed move the
1722 * sender address from kernel to user space.
1723 */
1724
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001725SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1726 unsigned, flags, struct sockaddr __user *, addr,
1727 int __user *, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728{
1729 struct socket *sock;
1730 struct iovec iov;
1731 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001732 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001733 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001734 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001736 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001738 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001740 msg.msg_control = NULL;
1741 msg.msg_controllen = 0;
1742 msg.msg_iovlen = 1;
1743 msg.msg_iov = &iov;
1744 iov.iov_len = size;
1745 iov.iov_base = ubuf;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001746 msg.msg_name = (struct sockaddr *)&address;
1747 msg.msg_namelen = sizeof(address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748 if (sock->file->f_flags & O_NONBLOCK)
1749 flags |= MSG_DONTWAIT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001750 err = sock_recvmsg(sock, &msg, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001752 if (err >= 0 && addr != NULL) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001753 err2 = move_addr_to_user((struct sockaddr *)&address,
1754 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001755 if (err2 < 0)
1756 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001758
1759 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001760out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761 return err;
1762}
1763
1764/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001765 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 */
1767
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001768asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1769 unsigned flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770{
1771 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1772}
1773
1774/*
1775 * Set a socket option. Because we don't know the option lengths we have
1776 * to pass the user mode parameter for the protocols to sort out.
1777 */
1778
Heiko Carstens20f37032009-01-14 14:14:23 +01001779SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1780 char __user *, optval, int, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001782 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 struct socket *sock;
1784
1785 if (optlen < 0)
1786 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001787
1788 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1789 if (sock != NULL) {
1790 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001791 if (err)
1792 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793
1794 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001795 err =
1796 sock_setsockopt(sock, level, optname, optval,
1797 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001799 err =
1800 sock->ops->setsockopt(sock, level, optname, optval,
1801 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001802out_put:
1803 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 }
1805 return err;
1806}
1807
1808/*
1809 * Get a socket option. Because we don't know the option lengths we have
1810 * to pass a user mode parameter for the protocols to sort out.
1811 */
1812
Heiko Carstens20f37032009-01-14 14:14:23 +01001813SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1814 char __user *, optval, int __user *, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001816 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 struct socket *sock;
1818
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001819 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1820 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001821 err = security_socket_getsockopt(sock, level, optname);
1822 if (err)
1823 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824
1825 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001826 err =
1827 sock_getsockopt(sock, level, optname, optval,
1828 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001830 err =
1831 sock->ops->getsockopt(sock, level, optname, optval,
1832 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001833out_put:
1834 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835 }
1836 return err;
1837}
1838
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839/*
1840 * Shutdown a socket.
1841 */
1842
Heiko Carstens754fe8d2009-01-14 14:14:09 +01001843SYSCALL_DEFINE2(shutdown, int, fd, int, how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001845 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846 struct socket *sock;
1847
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001848 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1849 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001851 if (!err)
1852 err = sock->ops->shutdown(sock, how);
1853 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854 }
1855 return err;
1856}
1857
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001858/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859 * fields which are the same type (int / unsigned) on our platforms.
1860 */
1861#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1862#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1863#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1864
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865/*
1866 * BSD sendmsg interface
1867 */
1868
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001869SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001871 struct compat_msghdr __user *msg_compat =
1872 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001874 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07001876 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001877 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1878 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879 unsigned char *ctl_buf = ctl;
1880 struct msghdr msg_sys;
1881 int err, ctl_len, iov_size, total_len;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001882 int fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001883
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884 err = -EFAULT;
1885 if (MSG_CMSG_COMPAT & flags) {
1886 if (get_compat_msghdr(&msg_sys, msg_compat))
1887 return -EFAULT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001888 }
1889 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 return -EFAULT;
1891
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001892 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001893 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 goto out;
1895
1896 /* do not move before msg_sys is valid */
1897 err = -EMSGSIZE;
1898 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1899 goto out_put;
1900
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001901 /* Check whether to allocate the iovec area */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902 err = -ENOMEM;
1903 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1904 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1905 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1906 if (!iov)
1907 goto out_put;
1908 }
1909
1910 /* This will also move the address data into kernel space */
1911 if (MSG_CMSG_COMPAT & flags) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001912 err = verify_compat_iovec(&msg_sys, iov,
1913 (struct sockaddr *)&address,
1914 VERIFY_READ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 } else
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001916 err = verify_iovec(&msg_sys, iov,
1917 (struct sockaddr *)&address,
1918 VERIFY_READ);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001919 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920 goto out_freeiov;
1921 total_len = err;
1922
1923 err = -ENOBUFS;
1924
1925 if (msg_sys.msg_controllen > INT_MAX)
1926 goto out_freeiov;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001927 ctl_len = msg_sys.msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001929 err =
1930 cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl,
1931 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 if (err)
1933 goto out_freeiov;
1934 ctl_buf = msg_sys.msg_control;
Al Viro8920e8f2005-09-07 18:28:51 -07001935 ctl_len = msg_sys.msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 } else if (ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001937 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001939 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940 goto out_freeiov;
1941 }
1942 err = -EFAULT;
1943 /*
1944 * Careful! Before this, msg_sys.msg_control contains a user pointer.
1945 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1946 * checking falls down on this.
1947 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001948 if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control,
1949 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950 goto out_freectl;
1951 msg_sys.msg_control = ctl_buf;
1952 }
1953 msg_sys.msg_flags = flags;
1954
1955 if (sock->file->f_flags & O_NONBLOCK)
1956 msg_sys.msg_flags |= MSG_DONTWAIT;
1957 err = sock_sendmsg(sock, &msg_sys, total_len);
1958
1959out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001960 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1962out_freeiov:
1963 if (iov != iovstack)
1964 sock_kfree_s(sock->sk, iov, iov_size);
1965out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001966 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001967out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968 return err;
1969}
1970
1971/*
1972 * BSD recvmsg interface
1973 */
1974
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001975SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
1976 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001978 struct compat_msghdr __user *msg_compat =
1979 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980 struct socket *sock;
1981 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001982 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983 struct msghdr msg_sys;
1984 unsigned long cmsg_ptr;
1985 int err, iov_size, total_len, len;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001986 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987
1988 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001989 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990
1991 /* user mode address pointers */
1992 struct sockaddr __user *uaddr;
1993 int __user *uaddr_len;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001994
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995 if (MSG_CMSG_COMPAT & flags) {
1996 if (get_compat_msghdr(&msg_sys, msg_compat))
1997 return -EFAULT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001998 }
1999 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
2000 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002002 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 if (!sock)
2004 goto out;
2005
2006 err = -EMSGSIZE;
2007 if (msg_sys.msg_iovlen > UIO_MAXIOV)
2008 goto out_put;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002009
2010 /* Check whether to allocate the iovec area */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011 err = -ENOMEM;
2012 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
2013 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
2014 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
2015 if (!iov)
2016 goto out_put;
2017 }
2018
2019 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002020 * Save the user-mode address (verify_iovec will change the
2021 * kernel msghdr to use the kernel address space)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002023
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -07002024 uaddr = (__force void __user *)msg_sys.msg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025 uaddr_len = COMPAT_NAMELEN(msg);
2026 if (MSG_CMSG_COMPAT & flags) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002027 err = verify_compat_iovec(&msg_sys, iov,
2028 (struct sockaddr *)&addr,
2029 VERIFY_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030 } else
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002031 err = verify_iovec(&msg_sys, iov,
2032 (struct sockaddr *)&addr,
2033 VERIFY_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034 if (err < 0)
2035 goto out_freeiov;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002036 total_len = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037
2038 cmsg_ptr = (unsigned long)msg_sys.msg_control;
Ulrich Drepper4a195422007-07-15 23:40:34 -07002039 msg_sys.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002040
Linus Torvalds1da177e2005-04-16 15:20:36 -07002041 if (sock->file->f_flags & O_NONBLOCK)
2042 flags |= MSG_DONTWAIT;
2043 err = sock_recvmsg(sock, &msg_sys, total_len, flags);
2044 if (err < 0)
2045 goto out_freeiov;
2046 len = err;
2047
2048 if (uaddr != NULL) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002049 err = move_addr_to_user((struct sockaddr *)&addr,
2050 msg_sys.msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002051 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052 if (err < 0)
2053 goto out_freeiov;
2054 }
David S. Miller37f7f422005-09-16 16:51:01 -07002055 err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT),
2056 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057 if (err)
2058 goto out_freeiov;
2059 if (MSG_CMSG_COMPAT & flags)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002060 err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061 &msg_compat->msg_controllen);
2062 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002063 err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064 &msg->msg_controllen);
2065 if (err)
2066 goto out_freeiov;
2067 err = len;
2068
2069out_freeiov:
2070 if (iov != iovstack)
2071 sock_kfree_s(sock->sk, iov, iov_size);
2072out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002073 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002074out:
2075 return err;
2076}
2077
2078#ifdef __ARCH_WANT_SYS_SOCKETCALL
2079
2080/* Argument list sizes for sys_socketcall */
2081#define AL(x) ((x) * sizeof(unsigned long))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002082static const unsigned char nargs[19]={
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002083 AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
2084 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002085 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3),
Ulrich Drepperde11def2008-11-19 15:36:14 -08002086 AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002087};
2088
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089#undef AL
2090
2091/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002092 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002093 *
2094 * Argument checking cleaned up. Saved 20% in size.
2095 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002096 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097 */
2098
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002099SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100{
2101 unsigned long a[6];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002102 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002104 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105
Ulrich Drepperde11def2008-11-19 15:36:14 -08002106 if (call < 1 || call > SYS_ACCEPT4)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107 return -EINVAL;
2108
Arjan van de Ven47379052009-09-28 12:57:44 -07002109 len = nargs[call];
2110 if (len > sizeof(a))
2111 return -EINVAL;
2112
Linus Torvalds1da177e2005-04-16 15:20:36 -07002113 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002114 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002116
Al Virof3298dc2008-12-10 03:16:51 -05002117 audit_socketcall(nargs[call] / sizeof(unsigned long), a);
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002118
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002119 a0 = a[0];
2120 a1 = a[1];
2121
2122 switch (call) {
2123 case SYS_SOCKET:
2124 err = sys_socket(a0, a1, a[2]);
2125 break;
2126 case SYS_BIND:
2127 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2128 break;
2129 case SYS_CONNECT:
2130 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2131 break;
2132 case SYS_LISTEN:
2133 err = sys_listen(a0, a1);
2134 break;
2135 case SYS_ACCEPT:
Ulrich Drepperde11def2008-11-19 15:36:14 -08002136 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2137 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002138 break;
2139 case SYS_GETSOCKNAME:
2140 err =
2141 sys_getsockname(a0, (struct sockaddr __user *)a1,
2142 (int __user *)a[2]);
2143 break;
2144 case SYS_GETPEERNAME:
2145 err =
2146 sys_getpeername(a0, (struct sockaddr __user *)a1,
2147 (int __user *)a[2]);
2148 break;
2149 case SYS_SOCKETPAIR:
2150 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2151 break;
2152 case SYS_SEND:
2153 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2154 break;
2155 case SYS_SENDTO:
2156 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2157 (struct sockaddr __user *)a[4], a[5]);
2158 break;
2159 case SYS_RECV:
2160 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2161 break;
2162 case SYS_RECVFROM:
2163 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2164 (struct sockaddr __user *)a[4],
2165 (int __user *)a[5]);
2166 break;
2167 case SYS_SHUTDOWN:
2168 err = sys_shutdown(a0, a1);
2169 break;
2170 case SYS_SETSOCKOPT:
2171 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2172 break;
2173 case SYS_GETSOCKOPT:
2174 err =
2175 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2176 (int __user *)a[4]);
2177 break;
2178 case SYS_SENDMSG:
2179 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2180 break;
2181 case SYS_RECVMSG:
2182 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2183 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002184 case SYS_ACCEPT4:
2185 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2186 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002187 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002188 default:
2189 err = -EINVAL;
2190 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191 }
2192 return err;
2193}
2194
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002195#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002197/**
2198 * sock_register - add a socket protocol handler
2199 * @ops: description of protocol
2200 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002201 * This function is called by a protocol handler that wants to
2202 * advertise its address family, and have it linked into the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002203 * socket interface. The value ops->family coresponds to the
2204 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002205 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002206int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002207{
2208 int err;
2209
2210 if (ops->family >= NPROTO) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002211 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
2212 NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002213 return -ENOBUFS;
2214 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002215
2216 spin_lock(&net_family_lock);
2217 if (net_families[ops->family])
2218 err = -EEXIST;
2219 else {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002220 net_families[ops->family] = ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221 err = 0;
2222 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002223 spin_unlock(&net_family_lock);
2224
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002225 printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002226 return err;
2227}
2228
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002229/**
2230 * sock_unregister - remove a protocol handler
2231 * @family: protocol family to remove
2232 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002233 * This function is called by a protocol handler that wants to
2234 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002235 * new socket creation.
2236 *
2237 * If protocol handler is a module, then it can use module reference
2238 * counts to protect against new references. If protocol handler is not
2239 * a module then it needs to provide its own protection in
2240 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002241 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002242void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002243{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002244 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002245
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002246 spin_lock(&net_family_lock);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002247 net_families[family] = NULL;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002248 spin_unlock(&net_family_lock);
2249
2250 synchronize_rcu();
2251
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002252 printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002253}
2254
Andi Kleen77d76ea2005-12-22 12:43:42 -08002255static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256{
2257 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002258 * Initialize sock SLAB cache.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002259 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002260
Linus Torvalds1da177e2005-04-16 15:20:36 -07002261 sk_init();
2262
Linus Torvalds1da177e2005-04-16 15:20:36 -07002263 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002264 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002265 */
2266 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002267
2268 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002269 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002270 */
2271
2272 init_inodecache();
2273 register_filesystem(&sock_fs_type);
2274 sock_mnt = kern_mount(&sock_fs_type);
Andi Kleen77d76ea2005-12-22 12:43:42 -08002275
2276 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002277 */
2278
2279#ifdef CONFIG_NETFILTER
2280 netfilter_init();
2281#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002282
2283 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002284}
2285
Andi Kleen77d76ea2005-12-22 12:43:42 -08002286core_initcall(sock_init); /* early initcall */
2287
Linus Torvalds1da177e2005-04-16 15:20:36 -07002288#ifdef CONFIG_PROC_FS
2289void socket_seq_show(struct seq_file *seq)
2290{
2291 int cpu;
2292 int counter = 0;
2293
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07002294 for_each_possible_cpu(cpu)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002295 counter += per_cpu(sockets_in_use, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002296
2297 /* It can be negative, by the way. 8) */
2298 if (counter < 0)
2299 counter = 0;
2300
2301 seq_printf(seq, "sockets: used %d\n", counter);
2302}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002303#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002304
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002305#ifdef CONFIG_COMPAT
2306static long compat_sock_ioctl(struct file *file, unsigned cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002307 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002308{
2309 struct socket *sock = file->private_data;
2310 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07002311 struct sock *sk;
2312 struct net *net;
2313
2314 sk = sock->sk;
2315 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002316
2317 if (sock->ops->compat_ioctl)
2318 ret = sock->ops->compat_ioctl(sock, cmd, arg);
2319
David S. Miller87de87d2008-06-03 09:14:03 -07002320 if (ret == -ENOIOCTLCMD &&
2321 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
2322 ret = compat_wext_handle_ioctl(net, cmd, arg);
2323
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002324 return ret;
2325}
2326#endif
2327
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07002328int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
2329{
2330 return sock->ops->bind(sock, addr, addrlen);
2331}
2332
2333int kernel_listen(struct socket *sock, int backlog)
2334{
2335 return sock->ops->listen(sock, backlog);
2336}
2337
2338int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
2339{
2340 struct sock *sk = sock->sk;
2341 int err;
2342
2343 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
2344 newsock);
2345 if (err < 0)
2346 goto done;
2347
2348 err = sock->ops->accept(sock, *newsock, flags);
2349 if (err < 0) {
2350 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07002351 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07002352 goto done;
2353 }
2354
2355 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08002356 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07002357
2358done:
2359 return err;
2360}
2361
2362int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09002363 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07002364{
2365 return sock->ops->connect(sock, addr, addrlen, flags);
2366}
2367
2368int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
2369 int *addrlen)
2370{
2371 return sock->ops->getname(sock, addr, addrlen, 0);
2372}
2373
2374int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
2375 int *addrlen)
2376{
2377 return sock->ops->getname(sock, addr, addrlen, 1);
2378}
2379
2380int kernel_getsockopt(struct socket *sock, int level, int optname,
2381 char *optval, int *optlen)
2382{
2383 mm_segment_t oldfs = get_fs();
2384 int err;
2385
2386 set_fs(KERNEL_DS);
2387 if (level == SOL_SOCKET)
2388 err = sock_getsockopt(sock, level, optname, optval, optlen);
2389 else
2390 err = sock->ops->getsockopt(sock, level, optname, optval,
2391 optlen);
2392 set_fs(oldfs);
2393 return err;
2394}
2395
2396int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07002397 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07002398{
2399 mm_segment_t oldfs = get_fs();
2400 int err;
2401
2402 set_fs(KERNEL_DS);
2403 if (level == SOL_SOCKET)
2404 err = sock_setsockopt(sock, level, optname, optval, optlen);
2405 else
2406 err = sock->ops->setsockopt(sock, level, optname, optval,
2407 optlen);
2408 set_fs(oldfs);
2409 return err;
2410}
2411
2412int kernel_sendpage(struct socket *sock, struct page *page, int offset,
2413 size_t size, int flags)
2414{
2415 if (sock->ops->sendpage)
2416 return sock->ops->sendpage(sock, page, offset, size, flags);
2417
2418 return sock_no_sendpage(sock, page, offset, size, flags);
2419}
2420
2421int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
2422{
2423 mm_segment_t oldfs = get_fs();
2424 int err;
2425
2426 set_fs(KERNEL_DS);
2427 err = sock->ops->ioctl(sock, cmd, arg);
2428 set_fs(oldfs);
2429
2430 return err;
2431}
2432
Trond Myklebust91cf45f2007-11-12 18:10:39 -08002433int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
2434{
2435 return sock->ops->shutdown(sock, how);
2436}
2437
Linus Torvalds1da177e2005-04-16 15:20:36 -07002438EXPORT_SYMBOL(sock_create);
2439EXPORT_SYMBOL(sock_create_kern);
2440EXPORT_SYMBOL(sock_create_lite);
2441EXPORT_SYMBOL(sock_map_fd);
2442EXPORT_SYMBOL(sock_recvmsg);
2443EXPORT_SYMBOL(sock_register);
2444EXPORT_SYMBOL(sock_release);
2445EXPORT_SYMBOL(sock_sendmsg);
2446EXPORT_SYMBOL(sock_unregister);
2447EXPORT_SYMBOL(sock_wake_async);
2448EXPORT_SYMBOL(sockfd_lookup);
2449EXPORT_SYMBOL(kernel_sendmsg);
2450EXPORT_SYMBOL(kernel_recvmsg);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07002451EXPORT_SYMBOL(kernel_bind);
2452EXPORT_SYMBOL(kernel_listen);
2453EXPORT_SYMBOL(kernel_accept);
2454EXPORT_SYMBOL(kernel_connect);
2455EXPORT_SYMBOL(kernel_getsockname);
2456EXPORT_SYMBOL(kernel_getpeername);
2457EXPORT_SYMBOL(kernel_getsockopt);
2458EXPORT_SYMBOL(kernel_setsockopt);
2459EXPORT_SYMBOL(kernel_sendpage);
2460EXPORT_SYMBOL(kernel_sock_ioctl);
Trond Myklebust91cf45f2007-11-12 18:10:39 -08002461EXPORT_SYMBOL(kernel_sock_shutdown);