blob: ec077037f534b6a3265342fc0ccfd1dd56893505 [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>
Stephen Hemminger55737fd2006-09-01 00:23:39 -070066#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#include <linux/netdevice.h>
68#include <linux/proc_fs.h>
69#include <linux/seq_file.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080070#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <linux/wanrouter.h>
72#include <linux/if_bridge.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030073#include <linux/if_frad.h>
74#include <linux/if_vlan.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#include <linux/init.h>
76#include <linux/poll.h>
77#include <linux/cache.h>
78#include <linux/module.h>
79#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070080#include <linux/mount.h>
81#include <linux/security.h>
82#include <linux/syscalls.h>
83#include <linux/compat.h>
84#include <linux/kmod.h>
David Woodhouse3ec3b2f2005-05-17 12:08:48 +010085#include <linux/audit.h>
Adrian Bunkd86b5e02006-01-21 00:46:55 +010086#include <linux/wireless.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88#include <asm/uaccess.h>
89#include <asm/unistd.h>
90
91#include <net/compat.h>
92
93#include <net/sock.h>
94#include <linux/netfilter.h>
95
96static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
Badari Pulavarty027445c2006-09-30 23:28:46 -070097static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
98 unsigned long nr_segs, loff_t pos);
99static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
100 unsigned long nr_segs, loff_t pos);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700101static int sock_mmap(struct file *file, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103static int sock_close(struct inode *inode, struct file *file);
104static unsigned int sock_poll(struct file *file,
105 struct poll_table_struct *wait);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700106static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800107#ifdef CONFIG_COMPAT
108static long compat_sock_ioctl(struct file *file,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700109 unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800110#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111static int sock_fasync(int fd, struct file *filp, int on);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112static ssize_t sock_sendpage(struct file *file, struct page *page,
113 int offset, size_t size, loff_t *ppos, int more);
114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115/*
116 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
117 * in the operation structures but are done directly via the socketcall() multiplexor.
118 */
119
Arjan van de Venda7071d2007-02-12 00:55:36 -0800120static const struct file_operations socket_file_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 .owner = THIS_MODULE,
122 .llseek = no_llseek,
123 .aio_read = sock_aio_read,
124 .aio_write = sock_aio_write,
125 .poll = sock_poll,
126 .unlocked_ioctl = sock_ioctl,
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800127#ifdef CONFIG_COMPAT
128 .compat_ioctl = compat_sock_ioctl,
129#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 .mmap = sock_mmap,
131 .open = sock_no_open, /* special open code to disallow open via /proc */
132 .release = sock_close,
133 .fasync = sock_fasync,
Jens Axboe5274f052006-03-30 15:15:30 +0200134 .sendpage = sock_sendpage,
135 .splice_write = generic_splice_sendpage,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136};
137
138/*
139 * The protocol list. Each protocol is registered in here.
140 */
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142static DEFINE_SPINLOCK(net_family_lock);
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -0700143static const struct net_proto_family *net_families[NPROTO] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145/*
146 * Statistics counters of the socket lists
147 */
148
149static DEFINE_PER_CPU(int, sockets_in_use) = 0;
150
151/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700152 * Support routines.
153 * Move socket addresses back and forth across the kernel/user
154 * divide and look after the messy bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 */
156
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700157#define MAX_SOCK_ADDR 128 /* 108 for Unix domain -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 16 for IP, 16 for IPX,
159 24 for IPv6,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700160 about 80 for AX.25
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 must be at least one bigger than
162 the AF_UNIX size (see net/unix/af_unix.c
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700163 :unix_mkname()).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166/**
167 * move_addr_to_kernel - copy a socket address into kernel space
168 * @uaddr: Address in user space
169 * @kaddr: Address in kernel space
170 * @ulen: Length in user space
171 *
172 * The address is copied into kernel space. If the provided address is
173 * too long an error code of -EINVAL is returned. If the copy gives
174 * invalid addresses -EFAULT is returned. On a success 0 is returned.
175 */
176
177int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr)
178{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700179 if (ulen < 0 || ulen > MAX_SOCK_ADDR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700181 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700183 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100185 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
187
188/**
189 * move_addr_to_user - copy an address to user space
190 * @kaddr: kernel space address
191 * @klen: length of address in kernel
192 * @uaddr: user space address
193 * @ulen: pointer to user length field
194 *
195 * The value pointed to by ulen on entry is the buffer length available.
196 * This is overwritten with the buffer space used. -EINVAL is returned
197 * if an overlong buffer is specified or a negative buffer size. -EFAULT
198 * is returned if either the buffer or the length field are not
199 * accessible.
200 * After copying the data up to the limit the user specifies, the true
201 * length of the data is written over the length limit the user
202 * specified. Zero is returned for a success.
203 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700204
205int move_addr_to_user(void *kaddr, int klen, void __user *uaddr,
206 int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207{
208 int err;
209 int len;
210
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700211 err = get_user(len, ulen);
212 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700214 if (len > klen)
215 len = klen;
216 if (len < 0 || len > MAX_SOCK_ADDR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700218 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500219 if (audit_sockaddr(klen, kaddr))
220 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700221 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 return -EFAULT;
223 }
224 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700225 * "fromlen shall refer to the value before truncation.."
226 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 */
228 return __put_user(klen, ulen);
229}
230
231#define SOCKFS_MAGIC 0x534F434B
232
Christoph Lametere18b8902006-12-06 20:33:20 -0800233static struct kmem_cache *sock_inode_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235static struct inode *sock_alloc_inode(struct super_block *sb)
236{
237 struct socket_alloc *ei;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700238
Christoph Lametere94b1762006-12-06 20:33:17 -0800239 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 if (!ei)
241 return NULL;
242 init_waitqueue_head(&ei->socket.wait);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700243
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 ei->socket.fasync_list = NULL;
245 ei->socket.state = SS_UNCONNECTED;
246 ei->socket.flags = 0;
247 ei->socket.ops = NULL;
248 ei->socket.sk = NULL;
249 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251 return &ei->vfs_inode;
252}
253
254static void sock_destroy_inode(struct inode *inode)
255{
256 kmem_cache_free(sock_inode_cachep,
257 container_of(inode, struct socket_alloc, vfs_inode));
258}
259
Christoph Lametere18b8902006-12-06 20:33:20 -0800260static void init_once(void *foo, struct kmem_cache *cachep, unsigned long flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700262 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Christoph Lametera35afb82007-05-16 22:10:57 -0700264 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700266
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267static int init_inodecache(void)
268{
269 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700270 sizeof(struct socket_alloc),
271 0,
272 (SLAB_HWCACHE_ALIGN |
273 SLAB_RECLAIM_ACCOUNT |
274 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900275 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 if (sock_inode_cachep == NULL)
277 return -ENOMEM;
278 return 0;
279}
280
281static struct super_operations sockfs_ops = {
282 .alloc_inode = sock_alloc_inode,
283 .destroy_inode =sock_destroy_inode,
284 .statfs = simple_statfs,
285};
286
David Howells454e2392006-06-23 02:02:57 -0700287static int sockfs_get_sb(struct file_system_type *fs_type,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700288 int flags, const char *dev_name, void *data,
289 struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
David Howells454e2392006-06-23 02:02:57 -0700291 return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC,
292 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293}
294
Eric Dumazetba899662005-08-26 12:05:31 -0700295static struct vfsmount *sock_mnt __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297static struct file_system_type sock_fs_type = {
298 .name = "sockfs",
299 .get_sb = sockfs_get_sb,
300 .kill_sb = kill_anon_super,
301};
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303static int sockfs_delete_dentry(struct dentry *dentry)
304{
Eric Dumazet304e61e2006-12-06 20:38:49 -0800305 /*
306 * At creation time, we pretended this dentry was hashed
307 * (by clearing DCACHE_UNHASHED bit in d_flags)
308 * At delete time, we restore the truth : not hashed.
309 * (so that dput() can proceed correctly)
310 */
311 dentry->d_flags |= DCACHE_UNHASHED;
312 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313}
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700314
315/*
316 * sockfs_dname() is called from d_path().
317 */
318static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
319{
320 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
321 dentry->d_inode->i_ino);
322}
323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324static struct dentry_operations sockfs_dentry_operations = {
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700325 .d_delete = sockfs_delete_dentry,
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700326 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327};
328
329/*
330 * Obtains the first available file descriptor and sets it up for use.
331 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800332 * These functions create file structures and maps them to fd space
333 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 * and file struct implicitly stored in sock->file.
335 * Note that another thread may close file descriptor before we return
336 * from this function. We use the fact that now we do not refer
337 * to socket after mapping. If one day we will need it, this
338 * function will increment ref. count on file by 1.
339 *
340 * In any case returned fd MAY BE not valid!
341 * This race condition is unavoidable
342 * with shared fd spaces, we cannot solve it inside kernel,
343 * but we take care of internal coherence yet.
344 */
345
David S. Miller39d8c1b2006-03-20 17:13:49 -0800346static int sock_alloc_fd(struct file **filep)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
348 int fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800349
350 fd = get_unused_fd();
351 if (likely(fd >= 0)) {
352 struct file *file = get_empty_filp();
353
354 *filep = file;
355 if (unlikely(!file)) {
356 put_unused_fd(fd);
357 return -ENFILE;
358 }
359 } else
360 *filep = NULL;
361 return fd;
362}
363
364static int sock_attach_fd(struct socket *sock, struct file *file)
365{
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700366 struct qstr name = { .name = "" };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700368 file->f_path.dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name);
Josef Sipek3126a422006-12-08 02:37:23 -0800369 if (unlikely(!file->f_path.dentry))
David S. Miller39d8c1b2006-03-20 17:13:49 -0800370 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
Josef Sipek3126a422006-12-08 02:37:23 -0800372 file->f_path.dentry->d_op = &sockfs_dentry_operations;
Eric Dumazet304e61e2006-12-06 20:38:49 -0800373 /*
374 * We dont want to push this dentry into global dentry hash table.
375 * We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED
376 * This permits a working /proc/$pid/fd/XXX on sockets
377 */
Josef Sipek3126a422006-12-08 02:37:23 -0800378 file->f_path.dentry->d_flags &= ~DCACHE_UNHASHED;
379 d_instantiate(file->f_path.dentry, SOCK_INODE(sock));
380 file->f_path.mnt = mntget(sock_mnt);
381 file->f_mapping = file->f_path.dentry->d_inode->i_mapping;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800382
383 sock->file = file;
384 file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops;
385 file->f_mode = FMODE_READ | FMODE_WRITE;
386 file->f_flags = O_RDWR;
387 file->f_pos = 0;
388 file->private_data = sock;
389
390 return 0;
391}
392
393int sock_map_fd(struct socket *sock)
394{
395 struct file *newfile;
396 int fd = sock_alloc_fd(&newfile);
397
398 if (likely(fd >= 0)) {
399 int err = sock_attach_fd(sock, newfile);
400
401 if (unlikely(err < 0)) {
402 put_filp(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 put_unused_fd(fd);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800404 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800406 fd_install(fd, newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 return fd;
409}
410
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800411static struct socket *sock_from_file(struct file *file, int *err)
412{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800413 if (file->f_op == &socket_file_ops)
414 return file->private_data; /* set in sock_map_fd */
415
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800416 *err = -ENOTSOCK;
417 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800418}
419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420/**
421 * sockfd_lookup - Go from a file number to its socket slot
422 * @fd: file handle
423 * @err: pointer to an error code return
424 *
425 * The file handle passed in is locked and the socket it is bound
426 * too is returned. If an error occurs the err pointer is overwritten
427 * with a negative errno code and NULL is returned. The function checks
428 * for both invalid handles and passing a handle which is not a socket.
429 *
430 * On a success the socket object pointer is returned.
431 */
432
433struct socket *sockfd_lookup(int fd, int *err)
434{
435 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 struct socket *sock;
437
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700438 file = fget(fd);
439 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 *err = -EBADF;
441 return NULL;
442 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700443
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800444 sock = sock_from_file(file, err);
445 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 return sock;
448}
449
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800450static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
451{
452 struct file *file;
453 struct socket *sock;
454
Hua Zhong36725582006-04-19 15:25:02 -0700455 *err = -EBADF;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800456 file = fget_light(fd, fput_needed);
457 if (file) {
458 sock = sock_from_file(file, err);
459 if (sock)
460 return sock;
461 fput_light(file, *fput_needed);
462 }
463 return NULL;
464}
465
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466/**
467 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700468 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 * Allocate a new inode and socket object. The two are bound together
470 * and initialised. The socket is then returned. If we are out of inodes
471 * NULL is returned.
472 */
473
474static struct socket *sock_alloc(void)
475{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700476 struct inode *inode;
477 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
479 inode = new_inode(sock_mnt->mnt_sb);
480 if (!inode)
481 return NULL;
482
483 sock = SOCKET_I(inode);
484
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700485 inode->i_mode = S_IFSOCK | S_IRWXUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 inode->i_uid = current->fsuid;
487 inode->i_gid = current->fsgid;
488
489 get_cpu_var(sockets_in_use)++;
490 put_cpu_var(sockets_in_use);
491 return sock;
492}
493
494/*
495 * In theory you can't get an open on this inode, but /proc provides
496 * a back door. Remember to keep it shut otherwise you'll let the
497 * creepy crawlies in.
498 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700499
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
501{
502 return -ENXIO;
503}
504
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800505const struct file_operations bad_sock_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 .owner = THIS_MODULE,
507 .open = sock_no_open,
508};
509
510/**
511 * sock_release - close a socket
512 * @sock: socket to close
513 *
514 * The socket is released from the protocol stack if it has a release
515 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700516 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519void sock_release(struct socket *sock)
520{
521 if (sock->ops) {
522 struct module *owner = sock->ops->owner;
523
524 sock->ops->release(sock);
525 sock->ops = NULL;
526 module_put(owner);
527 }
528
529 if (sock->fasync_list)
530 printk(KERN_ERR "sock_release: fasync list not empty!\n");
531
532 get_cpu_var(sockets_in_use)--;
533 put_cpu_var(sockets_in_use);
534 if (!sock->file) {
535 iput(SOCK_INODE(sock));
536 return;
537 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700538 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539}
540
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700541static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 struct msghdr *msg, size_t size)
543{
544 struct sock_iocb *si = kiocb_to_siocb(iocb);
545 int err;
546
547 si->sock = sock;
548 si->scm = NULL;
549 si->msg = msg;
550 si->size = size;
551
552 err = security_socket_sendmsg(sock, msg, size);
553 if (err)
554 return err;
555
556 return sock->ops->sendmsg(iocb, sock, msg, size);
557}
558
559int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
560{
561 struct kiocb iocb;
562 struct sock_iocb siocb;
563 int ret;
564
565 init_sync_kiocb(&iocb, NULL);
566 iocb.private = &siocb;
567 ret = __sock_sendmsg(&iocb, sock, msg, size);
568 if (-EIOCBQUEUED == ret)
569 ret = wait_on_sync_kiocb(&iocb);
570 return ret;
571}
572
573int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
574 struct kvec *vec, size_t num, size_t size)
575{
576 mm_segment_t oldfs = get_fs();
577 int result;
578
579 set_fs(KERNEL_DS);
580 /*
581 * the following is safe, since for compiler definitions of kvec and
582 * iovec are identical, yielding the same in-core layout and alignment
583 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700584 msg->msg_iov = (struct iovec *)vec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 msg->msg_iovlen = num;
586 result = sock_sendmsg(sock, msg, size);
587 set_fs(oldfs);
588 return result;
589}
590
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700591/*
592 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
593 */
594void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
595 struct sk_buff *skb)
596{
597 ktime_t kt = skb->tstamp;
598
599 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
600 struct timeval tv;
601 /* Race occurred between timestamp enabling and packet
602 receiving. Fill in the current time for now. */
603 if (kt.tv64 == 0)
604 kt = ktime_get_real();
605 skb->tstamp = kt;
606 tv = ktime_to_timeval(kt);
607 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, sizeof(tv), &tv);
608 } else {
609 struct timespec ts;
610 /* Race occurred between timestamp enabling and packet
611 receiving. Fill in the current time for now. */
612 if (kt.tv64 == 0)
613 kt = ktime_get_real();
614 skb->tstamp = kt;
615 ts = ktime_to_timespec(kt);
616 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, sizeof(ts), &ts);
617 }
618}
619
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300620EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
621
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700622static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 struct msghdr *msg, size_t size, int flags)
624{
625 int err;
626 struct sock_iocb *si = kiocb_to_siocb(iocb);
627
628 si->sock = sock;
629 si->scm = NULL;
630 si->msg = msg;
631 si->size = size;
632 si->flags = flags;
633
634 err = security_socket_recvmsg(sock, msg, size, flags);
635 if (err)
636 return err;
637
638 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
639}
640
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700641int sock_recvmsg(struct socket *sock, struct msghdr *msg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 size_t size, int flags)
643{
644 struct kiocb iocb;
645 struct sock_iocb siocb;
646 int ret;
647
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700648 init_sync_kiocb(&iocb, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 iocb.private = &siocb;
650 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
651 if (-EIOCBQUEUED == ret)
652 ret = wait_on_sync_kiocb(&iocb);
653 return ret;
654}
655
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700656int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
657 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658{
659 mm_segment_t oldfs = get_fs();
660 int result;
661
662 set_fs(KERNEL_DS);
663 /*
664 * the following is safe, since for compiler definitions of kvec and
665 * iovec are identical, yielding the same in-core layout and alignment
666 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700667 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 result = sock_recvmsg(sock, msg, size, flags);
669 set_fs(oldfs);
670 return result;
671}
672
673static void sock_aio_dtor(struct kiocb *iocb)
674{
675 kfree(iocb->private);
676}
677
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300678static ssize_t sock_sendpage(struct file *file, struct page *page,
679 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680{
681 struct socket *sock;
682 int flags;
683
Eric Dumazetb69aee02005-09-06 14:42:45 -0700684 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
686 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
687 if (more)
688 flags |= MSG_MORE;
689
690 return sock->ops->sendpage(sock, page, offset, size, flags);
691}
692
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800693static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700694 struct sock_iocb *siocb)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800695{
696 if (!is_sync_kiocb(iocb)) {
697 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
698 if (!siocb)
699 return NULL;
700 iocb->ki_dtor = sock_aio_dtor;
701 }
702
703 siocb->kiocb = iocb;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800704 iocb->private = siocb;
705 return siocb;
706}
707
708static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700709 struct file *file, const struct iovec *iov,
710 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800711{
712 struct socket *sock = file->private_data;
713 size_t size = 0;
714 int i;
715
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700716 for (i = 0; i < nr_segs; i++)
717 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800718
719 msg->msg_name = NULL;
720 msg->msg_namelen = 0;
721 msg->msg_control = NULL;
722 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700723 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800724 msg->msg_iovlen = nr_segs;
725 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
726
727 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
728}
729
Badari Pulavarty027445c2006-09-30 23:28:46 -0700730static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
731 unsigned long nr_segs, loff_t pos)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800732{
733 struct sock_iocb siocb, *x;
734
735 if (pos != 0)
736 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700737
738 if (iocb->ki_left == 0) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800739 return 0;
740
Badari Pulavarty027445c2006-09-30 23:28:46 -0700741
742 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800743 if (!x)
744 return -ENOMEM;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700745 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800746}
747
748static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700749 struct file *file, const struct iovec *iov,
750 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800751{
752 struct socket *sock = file->private_data;
753 size_t size = 0;
754 int i;
755
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700756 for (i = 0; i < nr_segs; i++)
757 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800758
759 msg->msg_name = NULL;
760 msg->msg_namelen = 0;
761 msg->msg_control = NULL;
762 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700763 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800764 msg->msg_iovlen = nr_segs;
765 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
766 if (sock->type == SOCK_SEQPACKET)
767 msg->msg_flags |= MSG_EOR;
768
769 return __sock_sendmsg(iocb, sock, msg, size);
770}
771
Badari Pulavarty027445c2006-09-30 23:28:46 -0700772static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
773 unsigned long nr_segs, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774{
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800775 struct sock_iocb siocb, *x;
776
777 if (pos != 0)
778 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700779
780 if (iocb->ki_left == 0) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800781 return 0;
782
Badari Pulavarty027445c2006-09-30 23:28:46 -0700783 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800784 if (!x)
785 return -ENOMEM;
786
Badari Pulavarty027445c2006-09-30 23:28:46 -0700787 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788}
789
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790/*
791 * Atomic setting of ioctl hooks to avoid race
792 * with module unload.
793 */
794
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800795static DEFINE_MUTEX(br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700796static int (*br_ioctl_hook) (unsigned int cmd, void __user *arg) = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700798void brioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800800 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800802 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700804
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805EXPORT_SYMBOL(brioctl_set);
806
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800807static DEFINE_MUTEX(vlan_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700808static int (*vlan_ioctl_hook) (void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700810void vlan_ioctl_set(int (*hook) (void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800812 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800814 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700816
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817EXPORT_SYMBOL(vlan_ioctl_set);
818
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800819static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700820static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700822void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800824 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800826 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700828
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829EXPORT_SYMBOL(dlci_ioctl_set);
830
831/*
832 * With an ioctl, arg may well be a user mode pointer, but we don't know
833 * what to do with it - that's up to the protocol still.
834 */
835
836static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
837{
838 struct socket *sock;
839 void __user *argp = (void __user *)arg;
840 int pid, err;
841
Eric Dumazetb69aee02005-09-06 14:42:45 -0700842 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
844 err = dev_ioctl(cmd, argp);
845 } else
Adrian Bunkd86b5e02006-01-21 00:46:55 +0100846#ifdef CONFIG_WIRELESS_EXT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
848 err = dev_ioctl(cmd, argp);
849 } else
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700850#endif /* CONFIG_WIRELESS_EXT */
851 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 case FIOSETOWN:
853 case SIOCSPGRP:
854 err = -EFAULT;
855 if (get_user(pid, (int __user *)argp))
856 break;
857 err = f_setown(sock->file, pid, 1);
858 break;
859 case FIOGETOWN:
860 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700861 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700862 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 break;
864 case SIOCGIFBR:
865 case SIOCSIFBR:
866 case SIOCBRADDBR:
867 case SIOCBRDELBR:
868 err = -ENOPKG;
869 if (!br_ioctl_hook)
870 request_module("bridge");
871
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800872 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700873 if (br_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 err = br_ioctl_hook(cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800875 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 break;
877 case SIOCGIFVLAN:
878 case SIOCSIFVLAN:
879 err = -ENOPKG;
880 if (!vlan_ioctl_hook)
881 request_module("8021q");
882
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800883 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 if (vlan_ioctl_hook)
885 err = vlan_ioctl_hook(argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800886 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 case SIOCADDDLCI:
889 case SIOCDELDLCI:
890 err = -ENOPKG;
891 if (!dlci_ioctl_hook)
892 request_module("dlci");
893
894 if (dlci_ioctl_hook) {
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800895 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 err = dlci_ioctl_hook(cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800897 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 }
899 break;
900 default:
901 err = sock->ops->ioctl(sock, cmd, arg);
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -0800902
903 /*
904 * If this ioctl is unknown try to hand it down
905 * to the NIC driver.
906 */
907 if (err == -ENOIOCTLCMD)
908 err = dev_ioctl(cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700910 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 return err;
912}
913
914int sock_create_lite(int family, int type, int protocol, struct socket **res)
915{
916 int err;
917 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700918
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 err = security_socket_create(family, type, protocol, 1);
920 if (err)
921 goto out;
922
923 sock = sock_alloc();
924 if (!sock) {
925 err = -ENOMEM;
926 goto out;
927 }
928
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -0700930 err = security_socket_post_create(sock, family, type, protocol, 1);
931 if (err)
932 goto out_release;
933
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934out:
935 *res = sock;
936 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -0700937out_release:
938 sock_release(sock);
939 sock = NULL;
940 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941}
942
943/* No kernel lock held - perfect */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700944static unsigned int sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945{
946 struct socket *sock;
947
948 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700949 * We can't return errors to poll, so it's either yes or no.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 */
Eric Dumazetb69aee02005-09-06 14:42:45 -0700951 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 return sock->ops->poll(file, sock, wait);
953}
954
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700955static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956{
Eric Dumazetb69aee02005-09-06 14:42:45 -0700957 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
959 return sock->ops->mmap(file, sock, vma);
960}
961
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300962static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963{
964 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700965 * It was possible the inode is NULL we were
966 * closing an unfinished socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 */
968
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700969 if (!inode) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 printk(KERN_DEBUG "sock_close: NULL inode\n");
971 return 0;
972 }
973 sock_fasync(-1, filp, 0);
974 sock_release(SOCKET_I(inode));
975 return 0;
976}
977
978/*
979 * Update the socket async list
980 *
981 * Fasync_list locking strategy.
982 *
983 * 1. fasync_list is modified only under process context socket lock
984 * i.e. under semaphore.
985 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
986 * or under socket lock.
987 * 3. fasync_list can be used from softirq context, so that
988 * modification under socket lock have to be enhanced with
989 * write_lock_bh(&sk->sk_callback_lock).
990 * --ANK (990710)
991 */
992
993static int sock_fasync(int fd, struct file *filp, int on)
994{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700995 struct fasync_struct *fa, *fna = NULL, **prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 struct socket *sock;
997 struct sock *sk;
998
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700999 if (on) {
Kris Katterjohn8b3a7002006-01-11 15:56:43 -08001000 fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001001 if (fna == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 return -ENOMEM;
1003 }
1004
Eric Dumazetb69aee02005-09-06 14:42:45 -07001005 sock = filp->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001007 sk = sock->sk;
1008 if (sk == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 kfree(fna);
1010 return -EINVAL;
1011 }
1012
1013 lock_sock(sk);
1014
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001015 prev = &(sock->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001017 for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev)
1018 if (fa->fa_file == filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 break;
1020
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001021 if (on) {
1022 if (fa != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 write_lock_bh(&sk->sk_callback_lock);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001024 fa->fa_fd = fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 write_unlock_bh(&sk->sk_callback_lock);
1026
1027 kfree(fna);
1028 goto out;
1029 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001030 fna->fa_file = filp;
1031 fna->fa_fd = fd;
1032 fna->magic = FASYNC_MAGIC;
1033 fna->fa_next = sock->fasync_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 write_lock_bh(&sk->sk_callback_lock);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001035 sock->fasync_list = fna;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 write_unlock_bh(&sk->sk_callback_lock);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001037 } else {
1038 if (fa != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 write_lock_bh(&sk->sk_callback_lock);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001040 *prev = fa->fa_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 write_unlock_bh(&sk->sk_callback_lock);
1042 kfree(fa);
1043 }
1044 }
1045
1046out:
1047 release_sock(sock->sk);
1048 return 0;
1049}
1050
1051/* This function may be called only under socket lock or callback_lock */
1052
1053int sock_wake_async(struct socket *sock, int how, int band)
1054{
1055 if (!sock || !sock->fasync_list)
1056 return -1;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001057 switch (how) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 case 1:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001059
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1061 break;
1062 goto call_kill;
1063 case 2:
1064 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1065 break;
1066 /* fall through */
1067 case 0:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001068call_kill:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 __kill_fasync(sock->fasync_list, SIGIO, band);
1070 break;
1071 case 3:
1072 __kill_fasync(sock->fasync_list, SIGURG, band);
1073 }
1074 return 0;
1075}
1076
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001077static int __sock_create(int family, int type, int protocol,
1078 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079{
1080 int err;
1081 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001082 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083
1084 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001085 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 */
1087 if (family < 0 || family >= NPROTO)
1088 return -EAFNOSUPPORT;
1089 if (type < 0 || type >= SOCK_MAX)
1090 return -EINVAL;
1091
1092 /* Compatibility.
1093
1094 This uglymoron is moved from INET layer to here to avoid
1095 deadlock in module load.
1096 */
1097 if (family == PF_INET && type == SOCK_PACKET) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001098 static int warned;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 if (!warned) {
1100 warned = 1;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001101 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1102 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 }
1104 family = PF_PACKET;
1105 }
1106
1107 err = security_socket_create(family, type, protocol, kern);
1108 if (err)
1109 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001110
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001111 /*
1112 * Allocate the socket and allow the family to set things up. if
1113 * the protocol is 0, the family is instructed to select an appropriate
1114 * default.
1115 */
1116 sock = sock_alloc();
1117 if (!sock) {
1118 if (net_ratelimit())
1119 printk(KERN_WARNING "socket: no more sockets\n");
1120 return -ENFILE; /* Not exactly a match, but its the
1121 closest posix thing */
1122 }
1123
1124 sock->type = type;
1125
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126#if defined(CONFIG_KMOD)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001127 /* Attempt to load a protocol module if the find failed.
1128 *
1129 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 * requested real, full-featured networking support upon configuration.
1131 * Otherwise module support will break!
1132 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001133 if (net_families[family] == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001134 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135#endif
1136
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001137 rcu_read_lock();
1138 pf = rcu_dereference(net_families[family]);
1139 err = -EAFNOSUPPORT;
1140 if (!pf)
1141 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142
1143 /*
1144 * We will call the ->create function, that possibly is in a loadable
1145 * module, so we have to bump that loadable module refcnt first.
1146 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001147 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 goto out_release;
1149
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001150 /* Now protected by module ref count */
1151 rcu_read_unlock();
1152
1153 err = pf->create(sock, protocol);
1154 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001156
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 /*
1158 * Now to bump the refcnt of the [loadable] module that owns this
1159 * socket at sock_release time we decrement its refcnt.
1160 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001161 if (!try_module_get(sock->ops->owner))
1162 goto out_module_busy;
1163
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 /*
1165 * Now that we're done with the ->create function, the [loadable]
1166 * module can have its refcnt decremented
1167 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001168 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001169 err = security_socket_post_create(sock, family, type, protocol, kern);
1170 if (err)
1171 goto out_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001172 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001174 return 0;
1175
1176out_module_busy:
1177 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001179 sock->ops = NULL;
1180 module_put(pf->owner);
1181out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001183 return err;
1184
1185out_release:
1186 rcu_read_unlock();
1187 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188}
1189
1190int sock_create(int family, int type, int protocol, struct socket **res)
1191{
1192 return __sock_create(family, type, protocol, res, 0);
1193}
1194
1195int sock_create_kern(int family, int type, int protocol, struct socket **res)
1196{
1197 return __sock_create(family, type, protocol, res, 1);
1198}
1199
1200asmlinkage long sys_socket(int family, int type, int protocol)
1201{
1202 int retval;
1203 struct socket *sock;
1204
1205 retval = sock_create(family, type, protocol, &sock);
1206 if (retval < 0)
1207 goto out;
1208
1209 retval = sock_map_fd(sock);
1210 if (retval < 0)
1211 goto out_release;
1212
1213out:
1214 /* It may be already another descriptor 8) Not kernel problem. */
1215 return retval;
1216
1217out_release:
1218 sock_release(sock);
1219 return retval;
1220}
1221
1222/*
1223 * Create a pair of connected sockets.
1224 */
1225
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001226asmlinkage long sys_socketpair(int family, int type, int protocol,
1227 int __user *usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228{
1229 struct socket *sock1, *sock2;
1230 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001231 struct file *newfile1, *newfile2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232
1233 /*
1234 * Obtain the first socket and check if the underlying protocol
1235 * supports the socketpair call.
1236 */
1237
1238 err = sock_create(family, type, protocol, &sock1);
1239 if (err < 0)
1240 goto out;
1241
1242 err = sock_create(family, type, protocol, &sock2);
1243 if (err < 0)
1244 goto out_release_1;
1245
1246 err = sock1->ops->socketpair(sock1, sock2);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001247 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 goto out_release_both;
1249
Al Virodb349502007-02-07 01:48:00 -05001250 fd1 = sock_alloc_fd(&newfile1);
1251 if (unlikely(fd1 < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 goto out_release_both;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
Al Virodb349502007-02-07 01:48:00 -05001254 fd2 = sock_alloc_fd(&newfile2);
1255 if (unlikely(fd2 < 0)) {
1256 put_filp(newfile1);
1257 put_unused_fd(fd1);
1258 goto out_release_both;
1259 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260
Al Virodb349502007-02-07 01:48:00 -05001261 err = sock_attach_fd(sock1, newfile1);
1262 if (unlikely(err < 0)) {
1263 goto out_fd2;
1264 }
1265
1266 err = sock_attach_fd(sock2, newfile2);
1267 if (unlikely(err < 0)) {
1268 fput(newfile1);
1269 goto out_fd1;
1270 }
1271
1272 err = audit_fd_pair(fd1, fd2);
1273 if (err < 0) {
1274 fput(newfile1);
1275 fput(newfile2);
1276 goto out_fd;
1277 }
1278
1279 fd_install(fd1, newfile1);
1280 fd_install(fd2, newfile2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 /* fd1 and fd2 may be already another descriptors.
1282 * Not kernel problem.
1283 */
1284
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001285 err = put_user(fd1, &usockvec[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 if (!err)
1287 err = put_user(fd2, &usockvec[1]);
1288 if (!err)
1289 return 0;
1290
1291 sys_close(fd2);
1292 sys_close(fd1);
1293 return err;
1294
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295out_release_both:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001296 sock_release(sock2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297out_release_1:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001298 sock_release(sock1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299out:
1300 return err;
Al Virodb349502007-02-07 01:48:00 -05001301
1302out_fd2:
1303 put_filp(newfile1);
1304 sock_release(sock1);
1305out_fd1:
1306 put_filp(newfile2);
1307 sock_release(sock2);
1308out_fd:
1309 put_unused_fd(fd1);
1310 put_unused_fd(fd2);
1311 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312}
1313
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314/*
1315 * Bind a name to a socket. Nothing much to do here since it's
1316 * the protocol's responsibility to handle the local address.
1317 *
1318 * We move the socket address to kernel space before we call
1319 * the protocol layer (having also checked the address is ok).
1320 */
1321
1322asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
1323{
1324 struct socket *sock;
1325 char address[MAX_SOCK_ADDR];
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001326 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001328 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001329 if (sock) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001330 err = move_addr_to_kernel(umyaddr, addrlen, address);
1331 if (err >= 0) {
1332 err = security_socket_bind(sock,
1333 (struct sockaddr *)address,
1334 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001335 if (!err)
1336 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001337 (struct sockaddr *)
1338 address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001340 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001341 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 return err;
1343}
1344
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345/*
1346 * Perform a listen. Basically, we allow the protocol to do anything
1347 * necessary for a listen, and if that works, we mark the socket as
1348 * ready for listening.
1349 */
1350
Brian Haley7a42c212006-08-31 15:03:02 -07001351int sysctl_somaxconn __read_mostly = SOMAXCONN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352
1353asmlinkage long sys_listen(int fd, int backlog)
1354{
1355 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001356 int err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001357
1358 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1359 if (sock) {
1360 if ((unsigned)backlog > sysctl_somaxconn)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 backlog = sysctl_somaxconn;
1362
1363 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001364 if (!err)
1365 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001367 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 }
1369 return err;
1370}
1371
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372/*
1373 * For accept, we attempt to create a new socket, set up the link
1374 * with the client, wake up the client, then return the new
1375 * connected fd. We collect the address of the connector in kernel
1376 * space and move it to user at the very end. This is unclean because
1377 * we open the socket then return an error.
1378 *
1379 * 1003.1g adds the ability to recvmsg() to query connection pending
1380 * status to recvmsg. We need to add that support in a way thats
1381 * clean when we restucture accept also.
1382 */
1383
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001384asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr,
1385 int __user *upeer_addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386{
1387 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001388 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001389 int err, len, newfd, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 char address[MAX_SOCK_ADDR];
1391
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001392 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 if (!sock)
1394 goto out;
1395
1396 err = -ENFILE;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001397 if (!(newsock = sock_alloc()))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 goto out_put;
1399
1400 newsock->type = sock->type;
1401 newsock->ops = sock->ops;
1402
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 /*
1404 * We don't need try_module_get here, as the listening socket (sock)
1405 * has the protocol module (sock->ops->owner) held.
1406 */
1407 __module_get(newsock->ops->owner);
1408
David S. Miller39d8c1b2006-03-20 17:13:49 -08001409 newfd = sock_alloc_fd(&newfile);
1410 if (unlikely(newfd < 0)) {
1411 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001412 sock_release(newsock);
1413 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001414 }
1415
1416 err = sock_attach_fd(newsock, newfile);
1417 if (err < 0)
Alexey Dobriyan79f4f642007-03-26 14:09:52 -07001418 goto out_fd_simple;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001419
Frank Filza79af592005-09-27 15:23:38 -07001420 err = security_socket_accept(sock, newsock);
1421 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001422 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001423
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1425 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001426 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427
1428 if (upeer_sockaddr) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001429 if (newsock->ops->getname(newsock, (struct sockaddr *)address,
1430 &len, 2) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001432 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001434 err = move_addr_to_user(address, len, upeer_sockaddr,
1435 upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001437 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 }
1439
1440 /* File flags are not inherited via accept() unlike another OSes. */
1441
David S. Miller39d8c1b2006-03-20 17:13:49 -08001442 fd_install(newfd, newfile);
1443 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444
1445 security_socket_post_accept(sock, newsock);
1446
1447out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001448 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449out:
1450 return err;
Alexey Dobriyan79f4f642007-03-26 14:09:52 -07001451out_fd_simple:
1452 sock_release(newsock);
1453 put_filp(newfile);
1454 put_unused_fd(newfd);
1455 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001456out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001457 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001458 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459 goto out_put;
1460}
1461
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462/*
1463 * Attempt to connect to a socket with the server address. The address
1464 * is in user space so we verify it is OK and move it to kernel space.
1465 *
1466 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1467 * break bindings
1468 *
1469 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1470 * other SEQPACKET protocols that take time to connect() as it doesn't
1471 * include the -EINPROGRESS status for such sockets.
1472 */
1473
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001474asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr,
1475 int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476{
1477 struct socket *sock;
1478 char address[MAX_SOCK_ADDR];
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001479 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001481 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 if (!sock)
1483 goto out;
1484 err = move_addr_to_kernel(uservaddr, addrlen, address);
1485 if (err < 0)
1486 goto out_put;
1487
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001488 err =
1489 security_socket_connect(sock, (struct sockaddr *)address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 if (err)
1491 goto out_put;
1492
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001493 err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494 sock->file->f_flags);
1495out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001496 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497out:
1498 return err;
1499}
1500
1501/*
1502 * Get the local address ('name') of a socket object. Move the obtained
1503 * name to user space.
1504 */
1505
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001506asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1507 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508{
1509 struct socket *sock;
1510 char address[MAX_SOCK_ADDR];
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001511 int len, err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001512
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001513 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 if (!sock)
1515 goto out;
1516
1517 err = security_socket_getsockname(sock);
1518 if (err)
1519 goto out_put;
1520
1521 err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0);
1522 if (err)
1523 goto out_put;
1524 err = move_addr_to_user(address, len, usockaddr, usockaddr_len);
1525
1526out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001527 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528out:
1529 return err;
1530}
1531
1532/*
1533 * Get the remote address ('name') of a socket object. Move the obtained
1534 * name to user space.
1535 */
1536
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001537asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1538 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539{
1540 struct socket *sock;
1541 char address[MAX_SOCK_ADDR];
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001542 int len, err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001544 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1545 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546 err = security_socket_getpeername(sock);
1547 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001548 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 return err;
1550 }
1551
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001552 err =
1553 sock->ops->getname(sock, (struct sockaddr *)address, &len,
1554 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 if (!err)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001556 err = move_addr_to_user(address, len, usockaddr,
1557 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001558 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559 }
1560 return err;
1561}
1562
1563/*
1564 * Send a datagram to a given address. We move the address into kernel
1565 * space and check the user space data area is readable before invoking
1566 * the protocol.
1567 */
1568
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001569asmlinkage long sys_sendto(int fd, void __user *buff, size_t len,
1570 unsigned flags, struct sockaddr __user *addr,
1571 int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572{
1573 struct socket *sock;
1574 char address[MAX_SOCK_ADDR];
1575 int err;
1576 struct msghdr msg;
1577 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001578 int fput_needed;
1579 struct file *sock_file;
1580
1581 sock_file = fget_light(fd, &fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001582 err = -EBADF;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001583 if (!sock_file)
David S. Miller4387ff72007-02-08 15:06:08 -08001584 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001585
1586 sock = sock_from_file(sock_file, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 if (!sock)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001588 goto out_put;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001589 iov.iov_base = buff;
1590 iov.iov_len = len;
1591 msg.msg_name = NULL;
1592 msg.msg_iov = &iov;
1593 msg.msg_iovlen = 1;
1594 msg.msg_control = NULL;
1595 msg.msg_controllen = 0;
1596 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001597 if (addr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 err = move_addr_to_kernel(addr, addr_len, address);
1599 if (err < 0)
1600 goto out_put;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001601 msg.msg_name = address;
1602 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 }
1604 if (sock->file->f_flags & O_NONBLOCK)
1605 flags |= MSG_DONTWAIT;
1606 msg.msg_flags = flags;
1607 err = sock_sendmsg(sock, &msg, len);
1608
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001609out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001610 fput_light(sock_file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001611out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 return err;
1613}
1614
1615/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001616 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 */
1618
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001619asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620{
1621 return sys_sendto(fd, buff, len, flags, NULL, 0);
1622}
1623
1624/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001625 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626 * sender. We verify the buffers are writable and if needed move the
1627 * sender address from kernel to user space.
1628 */
1629
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001630asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size,
1631 unsigned flags, struct sockaddr __user *addr,
1632 int __user *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633{
1634 struct socket *sock;
1635 struct iovec iov;
1636 struct msghdr msg;
1637 char address[MAX_SOCK_ADDR];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001638 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001639 struct file *sock_file;
1640 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001642 sock_file = fget_light(fd, &fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001643 err = -EBADF;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001644 if (!sock_file)
David S. Miller4387ff72007-02-08 15:06:08 -08001645 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001646
1647 sock = sock_from_file(sock_file, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001649 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001651 msg.msg_control = NULL;
1652 msg.msg_controllen = 0;
1653 msg.msg_iovlen = 1;
1654 msg.msg_iov = &iov;
1655 iov.iov_len = size;
1656 iov.iov_base = ubuf;
1657 msg.msg_name = address;
1658 msg.msg_namelen = MAX_SOCK_ADDR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659 if (sock->file->f_flags & O_NONBLOCK)
1660 flags |= MSG_DONTWAIT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001661 err = sock_recvmsg(sock, &msg, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001663 if (err >= 0 && addr != NULL) {
1664 err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len);
1665 if (err2 < 0)
1666 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 }
David S. Miller4387ff72007-02-08 15:06:08 -08001668out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001669 fput_light(sock_file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001670out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 return err;
1672}
1673
1674/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001675 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676 */
1677
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001678asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1679 unsigned flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680{
1681 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1682}
1683
1684/*
1685 * Set a socket option. Because we don't know the option lengths we have
1686 * to pass the user mode parameter for the protocols to sort out.
1687 */
1688
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001689asmlinkage long sys_setsockopt(int fd, int level, int optname,
1690 char __user *optval, int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001692 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 struct socket *sock;
1694
1695 if (optlen < 0)
1696 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001697
1698 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1699 if (sock != NULL) {
1700 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001701 if (err)
1702 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703
1704 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001705 err =
1706 sock_setsockopt(sock, level, optname, optval,
1707 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001709 err =
1710 sock->ops->setsockopt(sock, level, optname, optval,
1711 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001712out_put:
1713 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714 }
1715 return err;
1716}
1717
1718/*
1719 * Get a socket option. Because we don't know the option lengths we have
1720 * to pass a user mode parameter for the protocols to sort out.
1721 */
1722
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001723asmlinkage long sys_getsockopt(int fd, int level, int optname,
1724 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001726 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 struct socket *sock;
1728
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001729 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1730 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001731 err = security_socket_getsockopt(sock, level, optname);
1732 if (err)
1733 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734
1735 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001736 err =
1737 sock_getsockopt(sock, level, optname, optval,
1738 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001740 err =
1741 sock->ops->getsockopt(sock, level, optname, optval,
1742 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001743out_put:
1744 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745 }
1746 return err;
1747}
1748
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749/*
1750 * Shutdown a socket.
1751 */
1752
1753asmlinkage long sys_shutdown(int fd, int how)
1754{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001755 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756 struct socket *sock;
1757
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001758 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1759 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001761 if (!err)
1762 err = sock->ops->shutdown(sock, how);
1763 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764 }
1765 return err;
1766}
1767
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001768/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769 * fields which are the same type (int / unsigned) on our platforms.
1770 */
1771#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1772#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1773#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1774
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775/*
1776 * BSD sendmsg interface
1777 */
1778
1779asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
1780{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001781 struct compat_msghdr __user *msg_compat =
1782 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 struct socket *sock;
1784 char address[MAX_SOCK_ADDR];
1785 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07001786 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001787 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1788 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 unsigned char *ctl_buf = ctl;
1790 struct msghdr msg_sys;
1791 int err, ctl_len, iov_size, total_len;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001792 int fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001793
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794 err = -EFAULT;
1795 if (MSG_CMSG_COMPAT & flags) {
1796 if (get_compat_msghdr(&msg_sys, msg_compat))
1797 return -EFAULT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001798 }
1799 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 return -EFAULT;
1801
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001802 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001803 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 goto out;
1805
1806 /* do not move before msg_sys is valid */
1807 err = -EMSGSIZE;
1808 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1809 goto out_put;
1810
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001811 /* Check whether to allocate the iovec area */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812 err = -ENOMEM;
1813 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1814 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1815 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1816 if (!iov)
1817 goto out_put;
1818 }
1819
1820 /* This will also move the address data into kernel space */
1821 if (MSG_CMSG_COMPAT & flags) {
1822 err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ);
1823 } else
1824 err = verify_iovec(&msg_sys, iov, address, VERIFY_READ);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001825 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826 goto out_freeiov;
1827 total_len = err;
1828
1829 err = -ENOBUFS;
1830
1831 if (msg_sys.msg_controllen > INT_MAX)
1832 goto out_freeiov;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001833 ctl_len = msg_sys.msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001835 err =
1836 cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl,
1837 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838 if (err)
1839 goto out_freeiov;
1840 ctl_buf = msg_sys.msg_control;
Al Viro8920e8f2005-09-07 18:28:51 -07001841 ctl_len = msg_sys.msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842 } else if (ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001843 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001845 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846 goto out_freeiov;
1847 }
1848 err = -EFAULT;
1849 /*
1850 * Careful! Before this, msg_sys.msg_control contains a user pointer.
1851 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1852 * checking falls down on this.
1853 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001854 if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control,
1855 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 goto out_freectl;
1857 msg_sys.msg_control = ctl_buf;
1858 }
1859 msg_sys.msg_flags = flags;
1860
1861 if (sock->file->f_flags & O_NONBLOCK)
1862 msg_sys.msg_flags |= MSG_DONTWAIT;
1863 err = sock_sendmsg(sock, &msg_sys, total_len);
1864
1865out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001866 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1868out_freeiov:
1869 if (iov != iovstack)
1870 sock_kfree_s(sock->sk, iov, iov_size);
1871out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001872 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001873out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874 return err;
1875}
1876
1877/*
1878 * BSD recvmsg interface
1879 */
1880
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001881asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg,
1882 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001884 struct compat_msghdr __user *msg_compat =
1885 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886 struct socket *sock;
1887 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001888 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889 struct msghdr msg_sys;
1890 unsigned long cmsg_ptr;
1891 int err, iov_size, total_len, len;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001892 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893
1894 /* kernel mode address */
1895 char addr[MAX_SOCK_ADDR];
1896
1897 /* user mode address pointers */
1898 struct sockaddr __user *uaddr;
1899 int __user *uaddr_len;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001900
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 if (MSG_CMSG_COMPAT & flags) {
1902 if (get_compat_msghdr(&msg_sys, msg_compat))
1903 return -EFAULT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001904 }
1905 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
1906 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001908 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 if (!sock)
1910 goto out;
1911
1912 err = -EMSGSIZE;
1913 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1914 goto out_put;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001915
1916 /* Check whether to allocate the iovec area */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917 err = -ENOMEM;
1918 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1919 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1920 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1921 if (!iov)
1922 goto out_put;
1923 }
1924
1925 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001926 * Save the user-mode address (verify_iovec will change the
1927 * kernel msghdr to use the kernel address space)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001929
1930 uaddr = (void __user *)msg_sys.msg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 uaddr_len = COMPAT_NAMELEN(msg);
1932 if (MSG_CMSG_COMPAT & flags) {
1933 err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1934 } else
1935 err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1936 if (err < 0)
1937 goto out_freeiov;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001938 total_len = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939
1940 cmsg_ptr = (unsigned long)msg_sys.msg_control;
Ulrich Drepper4a195422007-07-15 23:40:34 -07001941 msg_sys.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001942
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943 if (sock->file->f_flags & O_NONBLOCK)
1944 flags |= MSG_DONTWAIT;
1945 err = sock_recvmsg(sock, &msg_sys, total_len, flags);
1946 if (err < 0)
1947 goto out_freeiov;
1948 len = err;
1949
1950 if (uaddr != NULL) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001951 err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr,
1952 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953 if (err < 0)
1954 goto out_freeiov;
1955 }
David S. Miller37f7f422005-09-16 16:51:01 -07001956 err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT),
1957 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958 if (err)
1959 goto out_freeiov;
1960 if (MSG_CMSG_COMPAT & flags)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001961 err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 &msg_compat->msg_controllen);
1963 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001964 err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965 &msg->msg_controllen);
1966 if (err)
1967 goto out_freeiov;
1968 err = len;
1969
1970out_freeiov:
1971 if (iov != iovstack)
1972 sock_kfree_s(sock->sk, iov, iov_size);
1973out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001974 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975out:
1976 return err;
1977}
1978
1979#ifdef __ARCH_WANT_SYS_SOCKETCALL
1980
1981/* Argument list sizes for sys_socketcall */
1982#define AL(x) ((x) * sizeof(unsigned long))
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001983static const unsigned char nargs[18]={
1984 AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
1985 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
1986 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)
1987};
1988
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989#undef AL
1990
1991/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001992 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993 *
1994 * Argument checking cleaned up. Saved 20% in size.
1995 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001996 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997 */
1998
1999asmlinkage long sys_socketcall(int call, unsigned long __user *args)
2000{
2001 unsigned long a[6];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002002 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 int err;
2004
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002005 if (call < 1 || call > SYS_RECVMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006 return -EINVAL;
2007
2008 /* copy_from_user should be SMP safe. */
2009 if (copy_from_user(a, args, nargs[call]))
2010 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002011
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002012 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002013 if (err)
2014 return err;
2015
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002016 a0 = a[0];
2017 a1 = a[1];
2018
2019 switch (call) {
2020 case SYS_SOCKET:
2021 err = sys_socket(a0, a1, a[2]);
2022 break;
2023 case SYS_BIND:
2024 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2025 break;
2026 case SYS_CONNECT:
2027 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2028 break;
2029 case SYS_LISTEN:
2030 err = sys_listen(a0, a1);
2031 break;
2032 case SYS_ACCEPT:
2033 err =
2034 sys_accept(a0, (struct sockaddr __user *)a1,
2035 (int __user *)a[2]);
2036 break;
2037 case SYS_GETSOCKNAME:
2038 err =
2039 sys_getsockname(a0, (struct sockaddr __user *)a1,
2040 (int __user *)a[2]);
2041 break;
2042 case SYS_GETPEERNAME:
2043 err =
2044 sys_getpeername(a0, (struct sockaddr __user *)a1,
2045 (int __user *)a[2]);
2046 break;
2047 case SYS_SOCKETPAIR:
2048 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2049 break;
2050 case SYS_SEND:
2051 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2052 break;
2053 case SYS_SENDTO:
2054 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2055 (struct sockaddr __user *)a[4], a[5]);
2056 break;
2057 case SYS_RECV:
2058 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2059 break;
2060 case SYS_RECVFROM:
2061 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2062 (struct sockaddr __user *)a[4],
2063 (int __user *)a[5]);
2064 break;
2065 case SYS_SHUTDOWN:
2066 err = sys_shutdown(a0, a1);
2067 break;
2068 case SYS_SETSOCKOPT:
2069 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2070 break;
2071 case SYS_GETSOCKOPT:
2072 err =
2073 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2074 (int __user *)a[4]);
2075 break;
2076 case SYS_SENDMSG:
2077 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2078 break;
2079 case SYS_RECVMSG:
2080 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2081 break;
2082 default:
2083 err = -EINVAL;
2084 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085 }
2086 return err;
2087}
2088
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002089#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002091/**
2092 * sock_register - add a socket protocol handler
2093 * @ops: description of protocol
2094 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095 * This function is called by a protocol handler that wants to
2096 * advertise its address family, and have it linked into the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002097 * socket interface. The value ops->family coresponds to the
2098 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002100int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101{
2102 int err;
2103
2104 if (ops->family >= NPROTO) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002105 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
2106 NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107 return -ENOBUFS;
2108 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002109
2110 spin_lock(&net_family_lock);
2111 if (net_families[ops->family])
2112 err = -EEXIST;
2113 else {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002114 net_families[ops->family] = ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115 err = 0;
2116 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002117 spin_unlock(&net_family_lock);
2118
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002119 printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002120 return err;
2121}
2122
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002123/**
2124 * sock_unregister - remove a protocol handler
2125 * @family: protocol family to remove
2126 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002127 * This function is called by a protocol handler that wants to
2128 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002129 * new socket creation.
2130 *
2131 * If protocol handler is a module, then it can use module reference
2132 * counts to protect against new references. If protocol handler is not
2133 * a module then it needs to provide its own protection in
2134 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002136void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002137{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002138 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002140 spin_lock(&net_family_lock);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002141 net_families[family] = NULL;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002142 spin_unlock(&net_family_lock);
2143
2144 synchronize_rcu();
2145
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002146 printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002147}
2148
Andi Kleen77d76ea2005-12-22 12:43:42 -08002149static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002150{
2151 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002152 * Initialize sock SLAB cache.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002153 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002154
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155 sk_init();
2156
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002158 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159 */
2160 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161
2162 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002163 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164 */
2165
2166 init_inodecache();
2167 register_filesystem(&sock_fs_type);
2168 sock_mnt = kern_mount(&sock_fs_type);
Andi Kleen77d76ea2005-12-22 12:43:42 -08002169
2170 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002171 */
2172
2173#ifdef CONFIG_NETFILTER
2174 netfilter_init();
2175#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002176
2177 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002178}
2179
Andi Kleen77d76ea2005-12-22 12:43:42 -08002180core_initcall(sock_init); /* early initcall */
2181
Linus Torvalds1da177e2005-04-16 15:20:36 -07002182#ifdef CONFIG_PROC_FS
2183void socket_seq_show(struct seq_file *seq)
2184{
2185 int cpu;
2186 int counter = 0;
2187
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07002188 for_each_possible_cpu(cpu)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002189 counter += per_cpu(sockets_in_use, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002190
2191 /* It can be negative, by the way. 8) */
2192 if (counter < 0)
2193 counter = 0;
2194
2195 seq_printf(seq, "sockets: used %d\n", counter);
2196}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002197#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002198
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002199#ifdef CONFIG_COMPAT
2200static long compat_sock_ioctl(struct file *file, unsigned cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002201 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002202{
2203 struct socket *sock = file->private_data;
2204 int ret = -ENOIOCTLCMD;
2205
2206 if (sock->ops->compat_ioctl)
2207 ret = sock->ops->compat_ioctl(sock, cmd, arg);
2208
2209 return ret;
2210}
2211#endif
2212
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07002213int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
2214{
2215 return sock->ops->bind(sock, addr, addrlen);
2216}
2217
2218int kernel_listen(struct socket *sock, int backlog)
2219{
2220 return sock->ops->listen(sock, backlog);
2221}
2222
2223int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
2224{
2225 struct sock *sk = sock->sk;
2226 int err;
2227
2228 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
2229 newsock);
2230 if (err < 0)
2231 goto done;
2232
2233 err = sock->ops->accept(sock, *newsock, flags);
2234 if (err < 0) {
2235 sock_release(*newsock);
2236 goto done;
2237 }
2238
2239 (*newsock)->ops = sock->ops;
2240
2241done:
2242 return err;
2243}
2244
2245int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09002246 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07002247{
2248 return sock->ops->connect(sock, addr, addrlen, flags);
2249}
2250
2251int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
2252 int *addrlen)
2253{
2254 return sock->ops->getname(sock, addr, addrlen, 0);
2255}
2256
2257int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
2258 int *addrlen)
2259{
2260 return sock->ops->getname(sock, addr, addrlen, 1);
2261}
2262
2263int kernel_getsockopt(struct socket *sock, int level, int optname,
2264 char *optval, int *optlen)
2265{
2266 mm_segment_t oldfs = get_fs();
2267 int err;
2268
2269 set_fs(KERNEL_DS);
2270 if (level == SOL_SOCKET)
2271 err = sock_getsockopt(sock, level, optname, optval, optlen);
2272 else
2273 err = sock->ops->getsockopt(sock, level, optname, optval,
2274 optlen);
2275 set_fs(oldfs);
2276 return err;
2277}
2278
2279int kernel_setsockopt(struct socket *sock, int level, int optname,
2280 char *optval, int optlen)
2281{
2282 mm_segment_t oldfs = get_fs();
2283 int err;
2284
2285 set_fs(KERNEL_DS);
2286 if (level == SOL_SOCKET)
2287 err = sock_setsockopt(sock, level, optname, optval, optlen);
2288 else
2289 err = sock->ops->setsockopt(sock, level, optname, optval,
2290 optlen);
2291 set_fs(oldfs);
2292 return err;
2293}
2294
2295int kernel_sendpage(struct socket *sock, struct page *page, int offset,
2296 size_t size, int flags)
2297{
2298 if (sock->ops->sendpage)
2299 return sock->ops->sendpage(sock, page, offset, size, flags);
2300
2301 return sock_no_sendpage(sock, page, offset, size, flags);
2302}
2303
2304int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
2305{
2306 mm_segment_t oldfs = get_fs();
2307 int err;
2308
2309 set_fs(KERNEL_DS);
2310 err = sock->ops->ioctl(sock, cmd, arg);
2311 set_fs(oldfs);
2312
2313 return err;
2314}
2315
Linus Torvalds1da177e2005-04-16 15:20:36 -07002316/* ABI emulation layers need these two */
2317EXPORT_SYMBOL(move_addr_to_kernel);
2318EXPORT_SYMBOL(move_addr_to_user);
2319EXPORT_SYMBOL(sock_create);
2320EXPORT_SYMBOL(sock_create_kern);
2321EXPORT_SYMBOL(sock_create_lite);
2322EXPORT_SYMBOL(sock_map_fd);
2323EXPORT_SYMBOL(sock_recvmsg);
2324EXPORT_SYMBOL(sock_register);
2325EXPORT_SYMBOL(sock_release);
2326EXPORT_SYMBOL(sock_sendmsg);
2327EXPORT_SYMBOL(sock_unregister);
2328EXPORT_SYMBOL(sock_wake_async);
2329EXPORT_SYMBOL(sockfd_lookup);
2330EXPORT_SYMBOL(kernel_sendmsg);
2331EXPORT_SYMBOL(kernel_recvmsg);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07002332EXPORT_SYMBOL(kernel_bind);
2333EXPORT_SYMBOL(kernel_listen);
2334EXPORT_SYMBOL(kernel_accept);
2335EXPORT_SYMBOL(kernel_connect);
2336EXPORT_SYMBOL(kernel_getsockname);
2337EXPORT_SYMBOL(kernel_getpeername);
2338EXPORT_SYMBOL(kernel_getsockopt);
2339EXPORT_SYMBOL(kernel_setsockopt);
2340EXPORT_SYMBOL(kernel_sendpage);
2341EXPORT_SYMBOL(kernel_sock_ioctl);