blob: 367d5477d00fee1eb9fcd3eba5e6f31b1383e312 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NET An implementation of the SOCKET network access protocol.
3 *
4 * Version: @(#)socket.c 1.1.93 18/02/95
5 *
6 * Authors: Orest Zborowski, <obz@Kodak.COM>
Jesper Juhl02c30a82005-05-05 16:16:16 -07007 * Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
9 *
10 * Fixes:
11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
12 * shutdown()
13 * Alan Cox : verify_area() fixes
14 * Alan Cox : Removed DDI
15 * Jonathan Kamens : SOCK_DGRAM reconnect bug
16 * Alan Cox : Moved a load of checks to the very
17 * top level.
18 * Alan Cox : Move address structures to/from user
19 * mode above the protocol layers.
20 * Rob Janssen : Allow 0 length sends.
21 * Alan Cox : Asynchronous I/O support (cribbed from the
22 * tty drivers).
23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
24 * Jeff Uphoff : Made max number of sockets command-line
25 * configurable.
26 * Matti Aarnio : Made the number of sockets dynamic,
27 * to be allocated when needed, and mr.
28 * Uphoff's max is used as max to be
29 * allowed to allocate.
30 * Linus : Argh. removed all the socket allocation
31 * altogether: it's in the inode now.
32 * Alan Cox : Made sock_alloc()/sock_release() public
33 * for NetROM and future kernel nfsd type
34 * stuff.
35 * Alan Cox : sendmsg/recvmsg basics.
36 * Tom Dyas : Export net symbols.
37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
38 * Alan Cox : Added thread locking to sys_* calls
39 * for sockets. May have errors at the
40 * moment.
41 * Kevin Buhr : Fixed the dumb errors in the above.
42 * Andi Kleen : Some small cleanups, optimizations,
43 * and fixed a copy_from_user() bug.
44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
Stephen Hemminger89bddce2006-09-01 00:19:31 -070045 * Tigran Aivazian : Made listen(2) backlog sanity checks
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 * protocol-independent
47 *
48 *
49 * This program is free software; you can redistribute it and/or
50 * modify it under the terms of the GNU General Public License
51 * as published by the Free Software Foundation; either version
52 * 2 of the License, or (at your option) any later version.
53 *
54 *
55 * This module is effectively the top level interface to the BSD socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -070056 * paradigm.
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 *
58 * Based upon Swansea University Computer Society NET3.039
59 */
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/socket.h>
63#include <linux/file.h>
64#include <linux/net.h>
65#include <linux/interrupt.h>
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -070066#include <linux/thread_info.h>
Stephen Hemminger55737fd2006-09-01 00:23:39 -070067#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <linux/netdevice.h>
69#include <linux/proc_fs.h>
70#include <linux/seq_file.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080071#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#include <linux/wanrouter.h>
73#include <linux/if_bridge.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030074#include <linux/if_frad.h>
75#include <linux/if_vlan.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#include <linux/init.h>
77#include <linux/poll.h>
78#include <linux/cache.h>
79#include <linux/module.h>
80#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#include <linux/mount.h>
82#include <linux/security.h>
83#include <linux/syscalls.h>
84#include <linux/compat.h>
85#include <linux/kmod.h>
David Woodhouse3ec3b2f2005-05-17 12:08:48 +010086#include <linux/audit.h>
Adrian Bunkd86b5e02006-01-21 00:46:55 +010087#include <linux/wireless.h>
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -070088#include <linux/nsproxy.h>
Nick Black1fd73172009-09-22 16:43:33 -070089#include <linux/magic.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090090#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92#include <asm/uaccess.h>
93#include <asm/unistd.h>
94
95#include <net/compat.h>
David S. Miller87de87d2008-06-03 09:14:03 -070096#include <net/wext.h>
Herbert Xuf8451722010-05-24 00:12:34 -070097#include <net/cls_cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99#include <net/sock.h>
100#include <linux/netfilter.h>
101
Arnd Bergmann6b960182009-11-06 23:10:54 -0800102#include <linux/if_tun.h>
103#include <linux/ipv6_route.h>
104#include <linux/route.h>
Arnd Bergmann6b960182009-11-06 23:10:54 -0800105#include <linux/sockios.h>
106#include <linux/atalk.h>
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
Badari Pulavarty027445c2006-09-30 23:28:46 -0700109static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
110 unsigned long nr_segs, loff_t pos);
111static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
112 unsigned long nr_segs, loff_t pos);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700113static int sock_mmap(struct file *file, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115static int sock_close(struct inode *inode, struct file *file);
116static unsigned int sock_poll(struct file *file,
117 struct poll_table_struct *wait);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700118static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800119#ifdef CONFIG_COMPAT
120static long compat_sock_ioctl(struct file *file,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700121 unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800122#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123static int sock_fasync(int fd, struct file *filp, int on);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124static ssize_t sock_sendpage(struct file *file, struct page *page,
125 int offset, size_t size, loff_t *ppos, int more);
Jens Axboe9c55e012007-11-06 23:30:13 -0800126static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
127 struct pipe_inode_info *pipe, size_t len,
128 unsigned int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130/*
131 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
132 * in the operation structures but are done directly via the socketcall() multiplexor.
133 */
134
Arjan van de Venda7071d2007-02-12 00:55:36 -0800135static const struct file_operations socket_file_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 .owner = THIS_MODULE,
137 .llseek = no_llseek,
138 .aio_read = sock_aio_read,
139 .aio_write = sock_aio_write,
140 .poll = sock_poll,
141 .unlocked_ioctl = sock_ioctl,
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800142#ifdef CONFIG_COMPAT
143 .compat_ioctl = compat_sock_ioctl,
144#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 .mmap = sock_mmap,
146 .open = sock_no_open, /* special open code to disallow open via /proc */
147 .release = sock_close,
148 .fasync = sock_fasync,
Jens Axboe5274f052006-03-30 15:15:30 +0200149 .sendpage = sock_sendpage,
150 .splice_write = generic_splice_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800151 .splice_read = sock_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152};
153
154/*
155 * The protocol list. Each protocol is registered in here.
156 */
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158static DEFINE_SPINLOCK(net_family_lock);
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -0700159static const struct net_proto_family *net_families[NPROTO] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161/*
162 * Statistics counters of the socket lists
163 */
164
165static DEFINE_PER_CPU(int, sockets_in_use) = 0;
166
167/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700168 * Support routines.
169 * Move socket addresses back and forth across the kernel/user
170 * divide and look after the messy bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 */
172
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700173#define MAX_SOCK_ADDR 128 /* 108 for Unix domain -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 16 for IP, 16 for IPX,
175 24 for IPv6,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700176 about 80 for AX.25
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 must be at least one bigger than
178 the AF_UNIX size (see net/unix/af_unix.c
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700179 :unix_mkname()).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182/**
183 * move_addr_to_kernel - copy a socket address into kernel space
184 * @uaddr: Address in user space
185 * @kaddr: Address in kernel space
186 * @ulen: Length in user space
187 *
188 * The address is copied into kernel space. If the provided address is
189 * too long an error code of -EINVAL is returned. If the copy gives
190 * invalid addresses -EFAULT is returned. On a success 0 is returned.
191 */
192
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700193int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194{
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700195 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700197 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700199 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100201 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202}
203
204/**
205 * move_addr_to_user - copy an address to user space
206 * @kaddr: kernel space address
207 * @klen: length of address in kernel
208 * @uaddr: user space address
209 * @ulen: pointer to user length field
210 *
211 * The value pointed to by ulen on entry is the buffer length available.
212 * This is overwritten with the buffer space used. -EINVAL is returned
213 * if an overlong buffer is specified or a negative buffer size. -EFAULT
214 * is returned if either the buffer or the length field are not
215 * accessible.
216 * After copying the data up to the limit the user specifies, the true
217 * length of the data is written over the length limit the user
218 * specified. Zero is returned for a success.
219 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700220
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700221int move_addr_to_user(struct sockaddr *kaddr, int klen, void __user *uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700222 int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
224 int err;
225 int len;
226
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700227 err = get_user(len, ulen);
228 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700230 if (len > klen)
231 len = klen;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700232 if (len < 0 || len > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700234 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500235 if (audit_sockaddr(klen, kaddr))
236 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700237 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 return -EFAULT;
239 }
240 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700241 * "fromlen shall refer to the value before truncation.."
242 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 */
244 return __put_user(klen, ulen);
245}
246
Christoph Lametere18b8902006-12-06 20:33:20 -0800247static struct kmem_cache *sock_inode_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249static struct inode *sock_alloc_inode(struct super_block *sb)
250{
251 struct socket_alloc *ei;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700252
Christoph Lametere94b1762006-12-06 20:33:17 -0800253 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 if (!ei)
255 return NULL;
Eric Dumazet43815482010-04-29 11:01:49 +0000256 ei->socket.wq = kmalloc(sizeof(struct socket_wq), GFP_KERNEL);
257 if (!ei->socket.wq) {
258 kmem_cache_free(sock_inode_cachep, ei);
259 return NULL;
260 }
261 init_waitqueue_head(&ei->socket.wq->wait);
262 ei->socket.wq->fasync_list = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700263
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 ei->socket.state = SS_UNCONNECTED;
265 ei->socket.flags = 0;
266 ei->socket.ops = NULL;
267 ei->socket.sk = NULL;
268 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
270 return &ei->vfs_inode;
271}
272
Eric Dumazet43815482010-04-29 11:01:49 +0000273
274static void wq_free_rcu(struct rcu_head *head)
275{
276 struct socket_wq *wq = container_of(head, struct socket_wq, rcu);
277
278 kfree(wq);
279}
280
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281static void sock_destroy_inode(struct inode *inode)
282{
Eric Dumazet43815482010-04-29 11:01:49 +0000283 struct socket_alloc *ei;
284
285 ei = container_of(inode, struct socket_alloc, vfs_inode);
286 call_rcu(&ei->socket.wq->rcu, wq_free_rcu);
287 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288}
289
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700290static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700292 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
Christoph Lametera35afb82007-05-16 22:10:57 -0700294 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297static int init_inodecache(void)
298{
299 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700300 sizeof(struct socket_alloc),
301 0,
302 (SLAB_HWCACHE_ALIGN |
303 SLAB_RECLAIM_ACCOUNT |
304 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900305 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 if (sock_inode_cachep == NULL)
307 return -ENOMEM;
308 return 0;
309}
310
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700311static const struct super_operations sockfs_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 .alloc_inode = sock_alloc_inode,
313 .destroy_inode =sock_destroy_inode,
314 .statfs = simple_statfs,
315};
316
David Howells454e2392006-06-23 02:02:57 -0700317static int sockfs_get_sb(struct file_system_type *fs_type,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700318 int flags, const char *dev_name, void *data,
319 struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
David Howells454e2392006-06-23 02:02:57 -0700321 return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC,
322 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323}
324
Eric Dumazetba899662005-08-26 12:05:31 -0700325static struct vfsmount *sock_mnt __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327static struct file_system_type sock_fs_type = {
328 .name = "sockfs",
329 .get_sb = sockfs_get_sb,
330 .kill_sb = kill_anon_super,
331};
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700332
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700333/*
334 * sockfs_dname() is called from d_path().
335 */
336static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
337{
338 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
339 dentry->d_inode->i_ino);
340}
341
Al Viro3ba13d12009-02-20 06:02:22 +0000342static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700343 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344};
345
346/*
347 * Obtains the first available file descriptor and sets it up for use.
348 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800349 * These functions create file structures and maps them to fd space
350 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 * and file struct implicitly stored in sock->file.
352 * Note that another thread may close file descriptor before we return
353 * from this function. We use the fact that now we do not refer
354 * to socket after mapping. If one day we will need it, this
355 * function will increment ref. count on file by 1.
356 *
357 * In any case returned fd MAY BE not valid!
358 * This race condition is unavoidable
359 * with shared fd spaces, we cannot solve it inside kernel,
360 * but we take care of internal coherence yet.
361 */
362
Al Viro7cbe66b2009-08-05 19:59:08 +0400363static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364{
Al Viro7cbe66b2009-08-05 19:59:08 +0400365 struct qstr name = { .name = "" };
Al Viro2c48b9c2009-08-09 00:52:35 +0400366 struct path path;
Al Viro7cbe66b2009-08-05 19:59:08 +0400367 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 int fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800369
Ulrich Dreppera677a032008-07-23 21:29:17 -0700370 fd = get_unused_fd_flags(flags);
Al Viro7cbe66b2009-08-05 19:59:08 +0400371 if (unlikely(fd < 0))
372 return fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800373
Al Viro2c48b9c2009-08-09 00:52:35 +0400374 path.dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name);
375 if (unlikely(!path.dentry)) {
Al Viro7cbe66b2009-08-05 19:59:08 +0400376 put_unused_fd(fd);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800377 return -ENOMEM;
Al Viro7cbe66b2009-08-05 19:59:08 +0400378 }
Al Viro2c48b9c2009-08-09 00:52:35 +0400379 path.mnt = mntget(sock_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Al Viro2c48b9c2009-08-09 00:52:35 +0400381 path.dentry->d_op = &sockfs_dentry_operations;
Al Viro2c48b9c2009-08-09 00:52:35 +0400382 d_instantiate(path.dentry, SOCK_INODE(sock));
Al Virocc3808f2009-08-06 09:43:59 +0400383 SOCK_INODE(sock)->i_fop = &socket_file_ops;
384
Al Viro2c48b9c2009-08-09 00:52:35 +0400385 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
Al Virocc3808f2009-08-06 09:43:59 +0400386 &socket_file_ops);
387 if (unlikely(!file)) {
388 /* drop dentry, keep inode */
389 atomic_inc(&path.dentry->d_inode->i_count);
Al Viro2c48b9c2009-08-09 00:52:35 +0400390 path_put(&path);
Al Virocc3808f2009-08-06 09:43:59 +0400391 put_unused_fd(fd);
392 return -ENFILE;
393 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800394
395 sock->file = file;
Ulrich Drepper77d27202008-07-23 21:29:35 -0700396 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800397 file->f_pos = 0;
398 file->private_data = sock;
399
Al Viro7cbe66b2009-08-05 19:59:08 +0400400 *f = file;
401 return fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800402}
403
Ulrich Dreppera677a032008-07-23 21:29:17 -0700404int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800405{
406 struct file *newfile;
Al Viro7cbe66b2009-08-05 19:59:08 +0400407 int fd = sock_alloc_file(sock, &newfile, flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800408
Al Viro7cbe66b2009-08-05 19:59:08 +0400409 if (likely(fd >= 0))
David S. Miller39d8c1b2006-03-20 17:13:49 -0800410 fd_install(fd, newfile);
Al Viro7cbe66b2009-08-05 19:59:08 +0400411
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 return fd;
413}
414
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800415static struct socket *sock_from_file(struct file *file, int *err)
416{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800417 if (file->f_op == &socket_file_ops)
418 return file->private_data; /* set in sock_map_fd */
419
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800420 *err = -ENOTSOCK;
421 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800422}
423
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424/**
425 * sockfd_lookup - Go from a file number to its socket slot
426 * @fd: file handle
427 * @err: pointer to an error code return
428 *
429 * The file handle passed in is locked and the socket it is bound
430 * too is returned. If an error occurs the err pointer is overwritten
431 * with a negative errno code and NULL is returned. The function checks
432 * for both invalid handles and passing a handle which is not a socket.
433 *
434 * On a success the socket object pointer is returned.
435 */
436
437struct socket *sockfd_lookup(int fd, int *err)
438{
439 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 struct socket *sock;
441
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700442 file = fget(fd);
443 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 *err = -EBADF;
445 return NULL;
446 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700447
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800448 sock = sock_from_file(file, err);
449 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 return sock;
452}
453
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800454static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
455{
456 struct file *file;
457 struct socket *sock;
458
Hua Zhong36725582006-04-19 15:25:02 -0700459 *err = -EBADF;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800460 file = fget_light(fd, fput_needed);
461 if (file) {
462 sock = sock_from_file(file, err);
463 if (sock)
464 return sock;
465 fput_light(file, *fput_needed);
466 }
467 return NULL;
468}
469
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470/**
471 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700472 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 * Allocate a new inode and socket object. The two are bound together
474 * and initialised. The socket is then returned. If we are out of inodes
475 * NULL is returned.
476 */
477
478static struct socket *sock_alloc(void)
479{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700480 struct inode *inode;
481 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 inode = new_inode(sock_mnt->mnt_sb);
484 if (!inode)
485 return NULL;
486
487 sock = SOCKET_I(inode);
488
Eric Dumazet29a020d2009-09-15 02:39:20 -0700489 kmemcheck_annotate_bitfield(sock, type);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700490 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100491 inode->i_uid = current_fsuid();
492 inode->i_gid = current_fsgid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Eric Dumazet4e694892009-04-04 16:41:09 -0700494 percpu_add(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 return sock;
496}
497
498/*
499 * In theory you can't get an open on this inode, but /proc provides
500 * a back door. Remember to keep it shut otherwise you'll let the
501 * creepy crawlies in.
502 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700503
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
505{
506 return -ENXIO;
507}
508
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800509const struct file_operations bad_sock_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 .owner = THIS_MODULE,
511 .open = sock_no_open,
512};
513
514/**
515 * sock_release - close a socket
516 * @sock: socket to close
517 *
518 * The socket is released from the protocol stack if it has a release
519 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700520 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700522
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523void sock_release(struct socket *sock)
524{
525 if (sock->ops) {
526 struct module *owner = sock->ops->owner;
527
528 sock->ops->release(sock);
529 sock->ops = NULL;
530 module_put(owner);
531 }
532
Eric Dumazet43815482010-04-29 11:01:49 +0000533 if (sock->wq->fasync_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 printk(KERN_ERR "sock_release: fasync list not empty!\n");
535
Eric Dumazet4e694892009-04-04 16:41:09 -0700536 percpu_sub(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 if (!sock->file) {
538 iput(SOCK_INODE(sock));
539 return;
540 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700541 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542}
543
Patrick Ohly20d49472009-02-12 05:03:38 +0000544int sock_tx_timestamp(struct msghdr *msg, struct sock *sk,
545 union skb_shared_tx *shtx)
546{
547 shtx->flags = 0;
548 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
549 shtx->hardware = 1;
550 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
551 shtx->software = 1;
552 return 0;
553}
554EXPORT_SYMBOL(sock_tx_timestamp);
555
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700556static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 struct msghdr *msg, size_t size)
558{
559 struct sock_iocb *si = kiocb_to_siocb(iocb);
560 int err;
561
Herbert Xuf8451722010-05-24 00:12:34 -0700562 sock_update_classid(sock->sk);
563
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 si->sock = sock;
565 si->scm = NULL;
566 si->msg = msg;
567 si->size = size;
568
569 err = security_socket_sendmsg(sock, msg, size);
570 if (err)
571 return err;
572
573 return sock->ops->sendmsg(iocb, sock, msg, size);
574}
575
576int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
577{
578 struct kiocb iocb;
579 struct sock_iocb siocb;
580 int ret;
581
582 init_sync_kiocb(&iocb, NULL);
583 iocb.private = &siocb;
584 ret = __sock_sendmsg(&iocb, sock, msg, size);
585 if (-EIOCBQUEUED == ret)
586 ret = wait_on_sync_kiocb(&iocb);
587 return ret;
588}
589
590int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
591 struct kvec *vec, size_t num, size_t size)
592{
593 mm_segment_t oldfs = get_fs();
594 int result;
595
596 set_fs(KERNEL_DS);
597 /*
598 * the following is safe, since for compiler definitions of kvec and
599 * iovec are identical, yielding the same in-core layout and alignment
600 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700601 msg->msg_iov = (struct iovec *)vec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 msg->msg_iovlen = num;
603 result = sock_sendmsg(sock, msg, size);
604 set_fs(oldfs);
605 return result;
606}
607
Patrick Ohly20d49472009-02-12 05:03:38 +0000608static int ktime2ts(ktime_t kt, struct timespec *ts)
609{
610 if (kt.tv64) {
611 *ts = ktime_to_timespec(kt);
612 return 1;
613 } else {
614 return 0;
615 }
616}
617
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700618/*
619 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
620 */
621void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
622 struct sk_buff *skb)
623{
Patrick Ohly20d49472009-02-12 05:03:38 +0000624 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
625 struct timespec ts[3];
626 int empty = 1;
627 struct skb_shared_hwtstamps *shhwtstamps =
628 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700629
Patrick Ohly20d49472009-02-12 05:03:38 +0000630 /* Race occurred between timestamp enabling and packet
631 receiving. Fill in the current time for now. */
632 if (need_software_tstamp && skb->tstamp.tv64 == 0)
633 __net_timestamp(skb);
634
635 if (need_software_tstamp) {
636 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
637 struct timeval tv;
638 skb_get_timestamp(skb, &tv);
639 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
640 sizeof(tv), &tv);
641 } else {
Hagen Paul Pfeifer842509b2010-04-06 05:39:52 +0000642 skb_get_timestampns(skb, &ts[0]);
Patrick Ohly20d49472009-02-12 05:03:38 +0000643 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
Hagen Paul Pfeifer842509b2010-04-06 05:39:52 +0000644 sizeof(ts[0]), &ts[0]);
Patrick Ohly20d49472009-02-12 05:03:38 +0000645 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700646 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000647
648
649 memset(ts, 0, sizeof(ts));
650 if (skb->tstamp.tv64 &&
651 sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) {
652 skb_get_timestampns(skb, ts + 0);
653 empty = 0;
654 }
655 if (shhwtstamps) {
656 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
657 ktime2ts(shhwtstamps->syststamp, ts + 1))
658 empty = 0;
659 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
660 ktime2ts(shhwtstamps->hwtstamp, ts + 2))
661 empty = 0;
662 }
663 if (!empty)
664 put_cmsg(msg, SOL_SOCKET,
665 SCM_TIMESTAMPING, sizeof(ts), &ts);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700666}
667
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300668EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
669
Neil Horman3b885782009-10-12 13:26:31 -0700670inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
671{
672 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
673 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
674 sizeof(__u32), &skb->dropcount);
675}
676
Eric Dumazet767dd032010-04-28 19:14:43 +0000677void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700678 struct sk_buff *skb)
679{
680 sock_recv_timestamp(msg, sk, skb);
681 sock_recv_drops(msg, sk, skb);
682}
Eric Dumazet767dd032010-04-28 19:14:43 +0000683EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700684
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700685static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
686 struct msghdr *msg, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 struct sock_iocb *si = kiocb_to_siocb(iocb);
689
Herbert Xuf8451722010-05-24 00:12:34 -0700690 sock_update_classid(sock->sk);
691
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 si->sock = sock;
693 si->scm = NULL;
694 si->msg = msg;
695 si->size = size;
696 si->flags = flags;
697
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
699}
700
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700701static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
702 struct msghdr *msg, size_t size, int flags)
703{
704 int err = security_socket_recvmsg(sock, msg, size, flags);
705
706 return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
707}
708
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700709int sock_recvmsg(struct socket *sock, struct msghdr *msg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 size_t size, int flags)
711{
712 struct kiocb iocb;
713 struct sock_iocb siocb;
714 int ret;
715
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700716 init_sync_kiocb(&iocb, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 iocb.private = &siocb;
718 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
719 if (-EIOCBQUEUED == ret)
720 ret = wait_on_sync_kiocb(&iocb);
721 return ret;
722}
723
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700724static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
725 size_t size, int flags)
726{
727 struct kiocb iocb;
728 struct sock_iocb siocb;
729 int ret;
730
731 init_sync_kiocb(&iocb, NULL);
732 iocb.private = &siocb;
733 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
734 if (-EIOCBQUEUED == ret)
735 ret = wait_on_sync_kiocb(&iocb);
736 return ret;
737}
738
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700739int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
740 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741{
742 mm_segment_t oldfs = get_fs();
743 int result;
744
745 set_fs(KERNEL_DS);
746 /*
747 * the following is safe, since for compiler definitions of kvec and
748 * iovec are identical, yielding the same in-core layout and alignment
749 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700750 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 result = sock_recvmsg(sock, msg, size, flags);
752 set_fs(oldfs);
753 return result;
754}
755
756static void sock_aio_dtor(struct kiocb *iocb)
757{
758 kfree(iocb->private);
759}
760
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300761static ssize_t sock_sendpage(struct file *file, struct page *page,
762 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763{
764 struct socket *sock;
765 int flags;
766
Eric Dumazetb69aee02005-09-06 14:42:45 -0700767 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
769 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
770 if (more)
771 flags |= MSG_MORE;
772
Linus Torvaldse6949582009-08-13 08:28:36 -0700773 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774}
775
Jens Axboe9c55e012007-11-06 23:30:13 -0800776static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
777 struct pipe_inode_info *pipe, size_t len,
778 unsigned int flags)
779{
780 struct socket *sock = file->private_data;
781
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800782 if (unlikely(!sock->ops->splice_read))
783 return -EINVAL;
784
Herbert Xuf8451722010-05-24 00:12:34 -0700785 sock_update_classid(sock->sk);
786
Jens Axboe9c55e012007-11-06 23:30:13 -0800787 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
788}
789
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800790static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700791 struct sock_iocb *siocb)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800792{
793 if (!is_sync_kiocb(iocb)) {
794 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
795 if (!siocb)
796 return NULL;
797 iocb->ki_dtor = sock_aio_dtor;
798 }
799
800 siocb->kiocb = iocb;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800801 iocb->private = siocb;
802 return siocb;
803}
804
805static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700806 struct file *file, const struct iovec *iov,
807 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800808{
809 struct socket *sock = file->private_data;
810 size_t size = 0;
811 int i;
812
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700813 for (i = 0; i < nr_segs; i++)
814 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800815
816 msg->msg_name = NULL;
817 msg->msg_namelen = 0;
818 msg->msg_control = NULL;
819 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700820 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800821 msg->msg_iovlen = nr_segs;
822 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
823
824 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
825}
826
Badari Pulavarty027445c2006-09-30 23:28:46 -0700827static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
828 unsigned long nr_segs, loff_t pos)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800829{
830 struct sock_iocb siocb, *x;
831
832 if (pos != 0)
833 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700834
835 if (iocb->ki_left == 0) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800836 return 0;
837
Badari Pulavarty027445c2006-09-30 23:28:46 -0700838
839 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800840 if (!x)
841 return -ENOMEM;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700842 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800843}
844
845static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700846 struct file *file, const struct iovec *iov,
847 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800848{
849 struct socket *sock = file->private_data;
850 size_t size = 0;
851 int i;
852
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700853 for (i = 0; i < nr_segs; i++)
854 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800855
856 msg->msg_name = NULL;
857 msg->msg_namelen = 0;
858 msg->msg_control = NULL;
859 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700860 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800861 msg->msg_iovlen = nr_segs;
862 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
863 if (sock->type == SOCK_SEQPACKET)
864 msg->msg_flags |= MSG_EOR;
865
866 return __sock_sendmsg(iocb, sock, msg, size);
867}
868
Badari Pulavarty027445c2006-09-30 23:28:46 -0700869static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
870 unsigned long nr_segs, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871{
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800872 struct sock_iocb siocb, *x;
873
874 if (pos != 0)
875 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700876
Badari Pulavarty027445c2006-09-30 23:28:46 -0700877 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800878 if (!x)
879 return -ENOMEM;
880
Badari Pulavarty027445c2006-09-30 23:28:46 -0700881 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882}
883
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884/*
885 * Atomic setting of ioctl hooks to avoid race
886 * with module unload.
887 */
888
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800889static DEFINE_MUTEX(br_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700890static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg) = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
Eric W. Biederman881d9662007-09-17 11:56:21 -0700892void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800894 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800896 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700898
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899EXPORT_SYMBOL(brioctl_set);
900
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800901static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700902static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903
Eric W. Biederman881d9662007-09-17 11:56:21 -0700904void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800906 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800908 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700910
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911EXPORT_SYMBOL(vlan_ioctl_set);
912
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800913static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700914static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700916void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800918 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800920 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700922
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923EXPORT_SYMBOL(dlci_ioctl_set);
924
Arnd Bergmann6b960182009-11-06 23:10:54 -0800925static long sock_do_ioctl(struct net *net, struct socket *sock,
926 unsigned int cmd, unsigned long arg)
927{
928 int err;
929 void __user *argp = (void __user *)arg;
930
931 err = sock->ops->ioctl(sock, cmd, arg);
932
933 /*
934 * If this ioctl is unknown try to hand it down
935 * to the NIC driver.
936 */
937 if (err == -ENOIOCTLCMD)
938 err = dev_ioctl(net, cmd, argp);
939
940 return err;
941}
942
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943/*
944 * With an ioctl, arg may well be a user mode pointer, but we don't know
945 * what to do with it - that's up to the protocol still.
946 */
947
948static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
949{
950 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700951 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 void __user *argp = (void __user *)arg;
953 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700954 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
Eric Dumazetb69aee02005-09-06 14:42:45 -0700956 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700957 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900958 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700960 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 } else
Johannes Berg3d23e342009-09-29 23:27:28 +0200962#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700964 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 } else
Johannes Berg3d23e342009-09-29 23:27:28 +0200966#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700967 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 case FIOSETOWN:
969 case SIOCSPGRP:
970 err = -EFAULT;
971 if (get_user(pid, (int __user *)argp))
972 break;
973 err = f_setown(sock->file, pid, 1);
974 break;
975 case FIOGETOWN:
976 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700977 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700978 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 break;
980 case SIOCGIFBR:
981 case SIOCSIFBR:
982 case SIOCBRADDBR:
983 case SIOCBRDELBR:
984 err = -ENOPKG;
985 if (!br_ioctl_hook)
986 request_module("bridge");
987
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800988 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700989 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700990 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800991 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 break;
993 case SIOCGIFVLAN:
994 case SIOCSIFVLAN:
995 err = -ENOPKG;
996 if (!vlan_ioctl_hook)
997 request_module("8021q");
998
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800999 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001001 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001002 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 case SIOCADDDLCI:
1005 case SIOCDELDLCI:
1006 err = -ENOPKG;
1007 if (!dlci_ioctl_hook)
1008 request_module("dlci");
1009
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001010 mutex_lock(&dlci_ioctl_mutex);
1011 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001013 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 break;
1015 default:
Arnd Bergmann6b960182009-11-06 23:10:54 -08001016 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001018 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 return err;
1020}
1021
1022int sock_create_lite(int family, int type, int protocol, struct socket **res)
1023{
1024 int err;
1025 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001026
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 err = security_socket_create(family, type, protocol, 1);
1028 if (err)
1029 goto out;
1030
1031 sock = sock_alloc();
1032 if (!sock) {
1033 err = -ENOMEM;
1034 goto out;
1035 }
1036
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001038 err = security_socket_post_create(sock, family, type, protocol, 1);
1039 if (err)
1040 goto out_release;
1041
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042out:
1043 *res = sock;
1044 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001045out_release:
1046 sock_release(sock);
1047 sock = NULL;
1048 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049}
1050
1051/* No kernel lock held - perfect */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001052static unsigned int sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053{
1054 struct socket *sock;
1055
1056 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001057 * We can't return errors to poll, so it's either yes or no.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 */
Eric Dumazetb69aee02005-09-06 14:42:45 -07001059 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 return sock->ops->poll(file, sock, wait);
1061}
1062
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001063static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001065 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066
1067 return sock->ops->mmap(file, sock, vma);
1068}
1069
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001070static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071{
1072 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001073 * It was possible the inode is NULL we were
1074 * closing an unfinished socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 */
1076
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001077 if (!inode) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 printk(KERN_DEBUG "sock_close: NULL inode\n");
1079 return 0;
1080 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 sock_release(SOCKET_I(inode));
1082 return 0;
1083}
1084
1085/*
1086 * Update the socket async list
1087 *
1088 * Fasync_list locking strategy.
1089 *
1090 * 1. fasync_list is modified only under process context socket lock
1091 * i.e. under semaphore.
1092 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001093 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 */
1095
1096static int sock_fasync(int fd, struct file *filp, int on)
1097{
Eric Dumazet989a2972010-04-14 09:55:35 +00001098 struct socket *sock = filp->private_data;
1099 struct sock *sk = sock->sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100
Eric Dumazet989a2972010-04-14 09:55:35 +00001101 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103
1104 lock_sock(sk);
1105
Eric Dumazet43815482010-04-29 11:01:49 +00001106 fasync_helper(fd, filp, on, &sock->wq->fasync_list);
Eric Dumazet989a2972010-04-14 09:55:35 +00001107
Eric Dumazet43815482010-04-29 11:01:49 +00001108 if (!sock->wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001109 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001110 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001111 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112
Eric Dumazet989a2972010-04-14 09:55:35 +00001113 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 return 0;
1115}
1116
Eric Dumazet43815482010-04-29 11:01:49 +00001117/* This function may be called only under socket lock or callback_lock or rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118
1119int sock_wake_async(struct socket *sock, int how, int band)
1120{
Eric Dumazet43815482010-04-29 11:01:49 +00001121 struct socket_wq *wq;
1122
1123 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001125 rcu_read_lock();
1126 wq = rcu_dereference(sock->wq);
1127 if (!wq || !wq->fasync_list) {
1128 rcu_read_unlock();
1129 return -1;
1130 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001131 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001132 case SOCK_WAKE_WAITD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1134 break;
1135 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001136 case SOCK_WAKE_SPACE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1138 break;
1139 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001140 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001141call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001142 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001144 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001145 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 }
Eric Dumazet43815482010-04-29 11:01:49 +00001147 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 return 0;
1149}
1150
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001151static int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001152 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153{
1154 int err;
1155 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001156 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
1158 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001159 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 */
1161 if (family < 0 || family >= NPROTO)
1162 return -EAFNOSUPPORT;
1163 if (type < 0 || type >= SOCK_MAX)
1164 return -EINVAL;
1165
1166 /* Compatibility.
1167
1168 This uglymoron is moved from INET layer to here to avoid
1169 deadlock in module load.
1170 */
1171 if (family == PF_INET && type == SOCK_PACKET) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001172 static int warned;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 if (!warned) {
1174 warned = 1;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001175 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1176 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 }
1178 family = PF_PACKET;
1179 }
1180
1181 err = security_socket_create(family, type, protocol, kern);
1182 if (err)
1183 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001184
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001185 /*
1186 * Allocate the socket and allow the family to set things up. if
1187 * the protocol is 0, the family is instructed to select an appropriate
1188 * default.
1189 */
1190 sock = sock_alloc();
1191 if (!sock) {
1192 if (net_ratelimit())
1193 printk(KERN_WARNING "socket: no more sockets\n");
1194 return -ENFILE; /* Not exactly a match, but its the
1195 closest posix thing */
1196 }
1197
1198 sock->type = type;
1199
Johannes Berg95a5afc2008-10-16 15:24:51 -07001200#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001201 /* Attempt to load a protocol module if the find failed.
1202 *
1203 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 * requested real, full-featured networking support upon configuration.
1205 * Otherwise module support will break!
1206 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001207 if (net_families[family] == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001208 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209#endif
1210
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001211 rcu_read_lock();
1212 pf = rcu_dereference(net_families[family]);
1213 err = -EAFNOSUPPORT;
1214 if (!pf)
1215 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216
1217 /*
1218 * We will call the ->create function, that possibly is in a loadable
1219 * module, so we have to bump that loadable module refcnt first.
1220 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001221 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 goto out_release;
1223
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001224 /* Now protected by module ref count */
1225 rcu_read_unlock();
1226
Eric Paris3f378b62009-11-05 22:18:14 -08001227 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001228 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001230
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 /*
1232 * Now to bump the refcnt of the [loadable] module that owns this
1233 * socket at sock_release time we decrement its refcnt.
1234 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001235 if (!try_module_get(sock->ops->owner))
1236 goto out_module_busy;
1237
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 /*
1239 * Now that we're done with the ->create function, the [loadable]
1240 * module can have its refcnt decremented
1241 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001242 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001243 err = security_socket_post_create(sock, family, type, protocol, kern);
1244 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001245 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001246 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001248 return 0;
1249
1250out_module_busy:
1251 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001253 sock->ops = NULL;
1254 module_put(pf->owner);
1255out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001257 return err;
1258
1259out_release:
1260 rcu_read_unlock();
1261 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262}
1263
1264int sock_create(int family, int type, int protocol, struct socket **res)
1265{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001266 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267}
1268
1269int sock_create_kern(int family, int type, int protocol, struct socket **res)
1270{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001271 return __sock_create(&init_net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272}
1273
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001274SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275{
1276 int retval;
1277 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001278 int flags;
1279
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001280 /* Check the SOCK_* constants for consistency. */
1281 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1282 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1283 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1284 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1285
Ulrich Dreppera677a032008-07-23 21:29:17 -07001286 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001287 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001288 return -EINVAL;
1289 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001291 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1292 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1293
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 retval = sock_create(family, type, protocol, &sock);
1295 if (retval < 0)
1296 goto out;
1297
Ulrich Drepper77d27202008-07-23 21:29:35 -07001298 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 if (retval < 0)
1300 goto out_release;
1301
1302out:
1303 /* It may be already another descriptor 8) Not kernel problem. */
1304 return retval;
1305
1306out_release:
1307 sock_release(sock);
1308 return retval;
1309}
1310
1311/*
1312 * Create a pair of connected sockets.
1313 */
1314
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001315SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1316 int __user *, usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317{
1318 struct socket *sock1, *sock2;
1319 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001320 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001321 int flags;
1322
1323 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001324 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001325 return -EINVAL;
1326 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001328 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1329 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1330
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 /*
1332 * Obtain the first socket and check if the underlying protocol
1333 * supports the socketpair call.
1334 */
1335
1336 err = sock_create(family, type, protocol, &sock1);
1337 if (err < 0)
1338 goto out;
1339
1340 err = sock_create(family, type, protocol, &sock2);
1341 if (err < 0)
1342 goto out_release_1;
1343
1344 err = sock1->ops->socketpair(sock1, sock2);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001345 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 goto out_release_both;
1347
Al Viro7cbe66b2009-08-05 19:59:08 +04001348 fd1 = sock_alloc_file(sock1, &newfile1, flags);
David S. Millerbf3c23d2007-10-29 21:54:02 -07001349 if (unlikely(fd1 < 0)) {
1350 err = fd1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 goto out_release_both;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001352 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353
Al Viro7cbe66b2009-08-05 19:59:08 +04001354 fd2 = sock_alloc_file(sock2, &newfile2, flags);
Al Viro198de4d2009-08-05 19:29:23 +04001355 if (unlikely(fd2 < 0)) {
1356 err = fd2;
1357 fput(newfile1);
1358 put_unused_fd(fd1);
1359 sock_release(sock2);
1360 goto out;
Al Virodb349502007-02-07 01:48:00 -05001361 }
1362
Al Viro157cf642008-12-14 04:57:47 -05001363 audit_fd_pair(fd1, fd2);
Al Virodb349502007-02-07 01:48:00 -05001364 fd_install(fd1, newfile1);
1365 fd_install(fd2, newfile2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 /* fd1 and fd2 may be already another descriptors.
1367 * Not kernel problem.
1368 */
1369
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001370 err = put_user(fd1, &usockvec[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 if (!err)
1372 err = put_user(fd2, &usockvec[1]);
1373 if (!err)
1374 return 0;
1375
1376 sys_close(fd2);
1377 sys_close(fd1);
1378 return err;
1379
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380out_release_both:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001381 sock_release(sock2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382out_release_1:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001383 sock_release(sock1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384out:
1385 return err;
1386}
1387
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388/*
1389 * Bind a name to a socket. Nothing much to do here since it's
1390 * the protocol's responsibility to handle the local address.
1391 *
1392 * We move the socket address to kernel space before we call
1393 * the protocol layer (having also checked the address is ok).
1394 */
1395
Heiko Carstens20f37032009-01-14 14:14:23 +01001396SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397{
1398 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001399 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001400 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001402 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001403 if (sock) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001404 err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001405 if (err >= 0) {
1406 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001407 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001408 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001409 if (!err)
1410 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001411 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001412 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001414 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001415 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 return err;
1417}
1418
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419/*
1420 * Perform a listen. Basically, we allow the protocol to do anything
1421 * necessary for a listen, and if that works, we mark the socket as
1422 * ready for listening.
1423 */
1424
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001425SYSCALL_DEFINE2(listen, int, fd, int, backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426{
1427 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001428 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001429 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001430
1431 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1432 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001433 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001434 if ((unsigned)backlog > somaxconn)
1435 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436
1437 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001438 if (!err)
1439 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001441 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 }
1443 return err;
1444}
1445
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446/*
1447 * For accept, we attempt to create a new socket, set up the link
1448 * with the client, wake up the client, then return the new
1449 * connected fd. We collect the address of the connector in kernel
1450 * space and move it to user at the very end. This is unclean because
1451 * we open the socket then return an error.
1452 *
1453 * 1003.1g adds the ability to recvmsg() to query connection pending
1454 * status to recvmsg. We need to add that support in a way thats
1455 * clean when we restucture accept also.
1456 */
1457
Heiko Carstens20f37032009-01-14 14:14:23 +01001458SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1459 int __user *, upeer_addrlen, int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460{
1461 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001462 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001463 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001464 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465
Ulrich Drepper77d27202008-07-23 21:29:35 -07001466 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001467 return -EINVAL;
1468
1469 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1470 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1471
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001472 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 if (!sock)
1474 goto out;
1475
1476 err = -ENFILE;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001477 if (!(newsock = sock_alloc()))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 goto out_put;
1479
1480 newsock->type = sock->type;
1481 newsock->ops = sock->ops;
1482
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 /*
1484 * We don't need try_module_get here, as the listening socket (sock)
1485 * has the protocol module (sock->ops->owner) held.
1486 */
1487 __module_get(newsock->ops->owner);
1488
Al Viro7cbe66b2009-08-05 19:59:08 +04001489 newfd = sock_alloc_file(newsock, &newfile, flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001490 if (unlikely(newfd < 0)) {
1491 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001492 sock_release(newsock);
1493 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001494 }
1495
Frank Filza79af592005-09-27 15:23:38 -07001496 err = security_socket_accept(sock, newsock);
1497 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001498 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001499
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1501 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001502 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503
1504 if (upeer_sockaddr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001505 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001506 &len, 2) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001508 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509 }
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001510 err = move_addr_to_user((struct sockaddr *)&address,
1511 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001513 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 }
1515
1516 /* File flags are not inherited via accept() unlike another OSes. */
1517
David S. Miller39d8c1b2006-03-20 17:13:49 -08001518 fd_install(newfd, newfile);
1519 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001522 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523out:
1524 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001525out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001526 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001527 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528 goto out_put;
1529}
1530
Heiko Carstens20f37032009-01-14 14:14:23 +01001531SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1532 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001533{
Ulrich Drepperde11def2008-11-19 15:36:14 -08001534 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001535}
1536
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537/*
1538 * Attempt to connect to a socket with the server address. The address
1539 * is in user space so we verify it is OK and move it to kernel space.
1540 *
1541 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1542 * break bindings
1543 *
1544 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1545 * other SEQPACKET protocols that take time to connect() as it doesn't
1546 * include the -EINPROGRESS status for such sockets.
1547 */
1548
Heiko Carstens20f37032009-01-14 14:14:23 +01001549SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1550 int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551{
1552 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001553 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001554 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001556 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557 if (!sock)
1558 goto out;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001559 err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560 if (err < 0)
1561 goto out_put;
1562
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001563 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001564 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 if (err)
1566 goto out_put;
1567
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001568 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 sock->file->f_flags);
1570out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001571 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572out:
1573 return err;
1574}
1575
1576/*
1577 * Get the local address ('name') of a socket object. Move the obtained
1578 * name to user space.
1579 */
1580
Heiko Carstens20f37032009-01-14 14:14:23 +01001581SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1582 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583{
1584 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001585 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001586 int len, err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001587
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001588 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589 if (!sock)
1590 goto out;
1591
1592 err = security_socket_getsockname(sock);
1593 if (err)
1594 goto out_put;
1595
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001596 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 if (err)
1598 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001599 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600
1601out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001602 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603out:
1604 return err;
1605}
1606
1607/*
1608 * Get the remote address ('name') of a socket object. Move the obtained
1609 * name to user space.
1610 */
1611
Heiko Carstens20f37032009-01-14 14:14:23 +01001612SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1613 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614{
1615 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001616 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001617 int len, err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001619 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1620 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 err = security_socket_getpeername(sock);
1622 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001623 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 return err;
1625 }
1626
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001627 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001628 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001629 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 if (!err)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001631 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001632 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001633 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 }
1635 return err;
1636}
1637
1638/*
1639 * Send a datagram to a given address. We move the address into kernel
1640 * space and check the user space data area is readable before invoking
1641 * the protocol.
1642 */
1643
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001644SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1645 unsigned, flags, struct sockaddr __user *, addr,
1646 int, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647{
1648 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001649 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 int err;
1651 struct msghdr msg;
1652 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001653 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001654
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001655 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1656 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001657 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001658
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001659 iov.iov_base = buff;
1660 iov.iov_len = len;
1661 msg.msg_name = NULL;
1662 msg.msg_iov = &iov;
1663 msg.msg_iovlen = 1;
1664 msg.msg_control = NULL;
1665 msg.msg_controllen = 0;
1666 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001667 if (addr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001668 err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 if (err < 0)
1670 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001671 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001672 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673 }
1674 if (sock->file->f_flags & O_NONBLOCK)
1675 flags |= MSG_DONTWAIT;
1676 msg.msg_flags = flags;
1677 err = sock_sendmsg(sock, &msg, len);
1678
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001679out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001680 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001681out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682 return err;
1683}
1684
1685/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001686 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687 */
1688
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001689SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1690 unsigned, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691{
1692 return sys_sendto(fd, buff, len, flags, NULL, 0);
1693}
1694
1695/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001696 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 * sender. We verify the buffers are writable and if needed move the
1698 * sender address from kernel to user space.
1699 */
1700
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001701SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1702 unsigned, flags, struct sockaddr __user *, addr,
1703 int __user *, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704{
1705 struct socket *sock;
1706 struct iovec iov;
1707 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001708 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001709 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001710 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001712 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001714 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001716 msg.msg_control = NULL;
1717 msg.msg_controllen = 0;
1718 msg.msg_iovlen = 1;
1719 msg.msg_iov = &iov;
1720 iov.iov_len = size;
1721 iov.iov_base = ubuf;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001722 msg.msg_name = (struct sockaddr *)&address;
1723 msg.msg_namelen = sizeof(address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724 if (sock->file->f_flags & O_NONBLOCK)
1725 flags |= MSG_DONTWAIT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001726 err = sock_recvmsg(sock, &msg, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001728 if (err >= 0 && addr != NULL) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001729 err2 = move_addr_to_user((struct sockaddr *)&address,
1730 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001731 if (err2 < 0)
1732 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001734
1735 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001736out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737 return err;
1738}
1739
1740/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001741 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742 */
1743
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001744asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1745 unsigned flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746{
1747 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1748}
1749
1750/*
1751 * Set a socket option. Because we don't know the option lengths we have
1752 * to pass the user mode parameter for the protocols to sort out.
1753 */
1754
Heiko Carstens20f37032009-01-14 14:14:23 +01001755SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1756 char __user *, optval, int, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001758 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759 struct socket *sock;
1760
1761 if (optlen < 0)
1762 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001763
1764 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1765 if (sock != NULL) {
1766 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001767 if (err)
1768 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769
1770 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001771 err =
1772 sock_setsockopt(sock, level, optname, optval,
1773 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001775 err =
1776 sock->ops->setsockopt(sock, level, optname, optval,
1777 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001778out_put:
1779 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780 }
1781 return err;
1782}
1783
1784/*
1785 * Get a socket option. Because we don't know the option lengths we have
1786 * to pass a user mode parameter for the protocols to sort out.
1787 */
1788
Heiko Carstens20f37032009-01-14 14:14:23 +01001789SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1790 char __user *, optval, int __user *, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001792 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793 struct socket *sock;
1794
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001795 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1796 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001797 err = security_socket_getsockopt(sock, level, optname);
1798 if (err)
1799 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800
1801 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001802 err =
1803 sock_getsockopt(sock, level, optname, optval,
1804 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001806 err =
1807 sock->ops->getsockopt(sock, level, optname, optval,
1808 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001809out_put:
1810 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 }
1812 return err;
1813}
1814
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815/*
1816 * Shutdown a socket.
1817 */
1818
Heiko Carstens754fe8d2009-01-14 14:14:09 +01001819SYSCALL_DEFINE2(shutdown, int, fd, int, how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001821 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 struct socket *sock;
1823
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001824 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1825 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001827 if (!err)
1828 err = sock->ops->shutdown(sock, how);
1829 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830 }
1831 return err;
1832}
1833
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001834/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835 * fields which are the same type (int / unsigned) on our platforms.
1836 */
1837#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1838#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1839#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1840
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841/*
1842 * BSD sendmsg interface
1843 */
1844
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001845SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001847 struct compat_msghdr __user *msg_compat =
1848 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001850 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07001852 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001853 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1854 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855 unsigned char *ctl_buf = ctl;
1856 struct msghdr msg_sys;
1857 int err, ctl_len, iov_size, total_len;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001858 int fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001859
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 err = -EFAULT;
1861 if (MSG_CMSG_COMPAT & flags) {
1862 if (get_compat_msghdr(&msg_sys, msg_compat))
1863 return -EFAULT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001864 }
1865 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866 return -EFAULT;
1867
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001868 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001869 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870 goto out;
1871
1872 /* do not move before msg_sys is valid */
1873 err = -EMSGSIZE;
1874 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1875 goto out_put;
1876
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001877 /* Check whether to allocate the iovec area */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878 err = -ENOMEM;
1879 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1880 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1881 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1882 if (!iov)
1883 goto out_put;
1884 }
1885
1886 /* This will also move the address data into kernel space */
1887 if (MSG_CMSG_COMPAT & flags) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001888 err = verify_compat_iovec(&msg_sys, iov,
1889 (struct sockaddr *)&address,
1890 VERIFY_READ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891 } else
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001892 err = verify_iovec(&msg_sys, iov,
1893 (struct sockaddr *)&address,
1894 VERIFY_READ);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001895 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896 goto out_freeiov;
1897 total_len = err;
1898
1899 err = -ENOBUFS;
1900
1901 if (msg_sys.msg_controllen > INT_MAX)
1902 goto out_freeiov;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001903 ctl_len = msg_sys.msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001905 err =
1906 cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl,
1907 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908 if (err)
1909 goto out_freeiov;
1910 ctl_buf = msg_sys.msg_control;
Al Viro8920e8f2005-09-07 18:28:51 -07001911 ctl_len = msg_sys.msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912 } else if (ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001913 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001915 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 goto out_freeiov;
1917 }
1918 err = -EFAULT;
1919 /*
1920 * Careful! Before this, msg_sys.msg_control contains a user pointer.
1921 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1922 * checking falls down on this.
1923 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001924 if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control,
1925 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 goto out_freectl;
1927 msg_sys.msg_control = ctl_buf;
1928 }
1929 msg_sys.msg_flags = flags;
1930
1931 if (sock->file->f_flags & O_NONBLOCK)
1932 msg_sys.msg_flags |= MSG_DONTWAIT;
1933 err = sock_sendmsg(sock, &msg_sys, total_len);
1934
1935out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001936 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1938out_freeiov:
1939 if (iov != iovstack)
1940 sock_kfree_s(sock->sk, iov, iov_size);
1941out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001942 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001943out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944 return err;
1945}
1946
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07001947static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
1948 struct msghdr *msg_sys, unsigned flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001950 struct compat_msghdr __user *msg_compat =
1951 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001953 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954 unsigned long cmsg_ptr;
1955 int err, iov_size, total_len, len;
1956
1957 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001958 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959
1960 /* user mode address pointers */
1961 struct sockaddr __user *uaddr;
1962 int __user *uaddr_len;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001963
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964 if (MSG_CMSG_COMPAT & flags) {
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07001965 if (get_compat_msghdr(msg_sys, msg_compat))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001966 return -EFAULT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001967 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07001968 else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001969 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001970
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971 err = -EMSGSIZE;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07001972 if (msg_sys->msg_iovlen > UIO_MAXIOV)
1973 goto out;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001974
1975 /* Check whether to allocate the iovec area */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976 err = -ENOMEM;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07001977 iov_size = msg_sys->msg_iovlen * sizeof(struct iovec);
1978 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1980 if (!iov)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07001981 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982 }
1983
1984 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001985 * Save the user-mode address (verify_iovec will change the
1986 * kernel msghdr to use the kernel address space)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001988
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07001989 uaddr = (__force void __user *)msg_sys->msg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990 uaddr_len = COMPAT_NAMELEN(msg);
1991 if (MSG_CMSG_COMPAT & flags) {
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07001992 err = verify_compat_iovec(msg_sys, iov,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001993 (struct sockaddr *)&addr,
1994 VERIFY_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995 } else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07001996 err = verify_iovec(msg_sys, iov,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001997 (struct sockaddr *)&addr,
1998 VERIFY_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999 if (err < 0)
2000 goto out_freeiov;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002001 total_len = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002002
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002003 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2004 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002005
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006 if (sock->file->f_flags & O_NONBLOCK)
2007 flags |= MSG_DONTWAIT;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002008 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
2009 total_len, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010 if (err < 0)
2011 goto out_freeiov;
2012 len = err;
2013
2014 if (uaddr != NULL) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002015 err = move_addr_to_user((struct sockaddr *)&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002016 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002017 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002018 if (err < 0)
2019 goto out_freeiov;
2020 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002021 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002022 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023 if (err)
2024 goto out_freeiov;
2025 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002026 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027 &msg_compat->msg_controllen);
2028 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002029 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030 &msg->msg_controllen);
2031 if (err)
2032 goto out_freeiov;
2033 err = len;
2034
2035out_freeiov:
2036 if (iov != iovstack)
2037 sock_kfree_s(sock->sk, iov, iov_size);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002038out:
2039 return err;
2040}
2041
2042/*
2043 * BSD recvmsg interface
2044 */
2045
2046SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
2047 unsigned int, flags)
2048{
2049 int fput_needed, err;
2050 struct msghdr msg_sys;
2051 struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
2052
2053 if (!sock)
2054 goto out;
2055
2056 err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2057
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002058 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059out:
2060 return err;
2061}
2062
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002063/*
2064 * Linux recvmmsg interface
2065 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002067int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2068 unsigned int flags, struct timespec *timeout)
2069{
2070 int fput_needed, err, datagrams;
2071 struct socket *sock;
2072 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002073 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002074 struct msghdr msg_sys;
2075 struct timespec end_time;
2076
2077 if (timeout &&
2078 poll_select_set_timeout(&end_time, timeout->tv_sec,
2079 timeout->tv_nsec))
2080 return -EINVAL;
2081
2082 datagrams = 0;
2083
2084 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2085 if (!sock)
2086 return err;
2087
2088 err = sock_error(sock->sk);
2089 if (err)
2090 goto out_put;
2091
2092 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002093 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002094
2095 while (datagrams < vlen) {
2096 /*
2097 * No need to ask LSM for more than the first datagram.
2098 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002099 if (MSG_CMSG_COMPAT & flags) {
2100 err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
2101 &msg_sys, flags, datagrams);
2102 if (err < 0)
2103 break;
2104 err = __put_user(err, &compat_entry->msg_len);
2105 ++compat_entry;
2106 } else {
2107 err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
2108 &msg_sys, flags, datagrams);
2109 if (err < 0)
2110 break;
2111 err = put_user(err, &entry->msg_len);
2112 ++entry;
2113 }
2114
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002115 if (err)
2116 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002117 ++datagrams;
2118
Brandon L Black71c5c152010-03-26 16:18:03 +00002119 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2120 if (flags & MSG_WAITFORONE)
2121 flags |= MSG_DONTWAIT;
2122
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002123 if (timeout) {
2124 ktime_get_ts(timeout);
2125 *timeout = timespec_sub(end_time, *timeout);
2126 if (timeout->tv_sec < 0) {
2127 timeout->tv_sec = timeout->tv_nsec = 0;
2128 break;
2129 }
2130
2131 /* Timeout, return less than vlen datagrams */
2132 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2133 break;
2134 }
2135
2136 /* Out of band data, return right away */
2137 if (msg_sys.msg_flags & MSG_OOB)
2138 break;
2139 }
2140
2141out_put:
2142 fput_light(sock->file, fput_needed);
2143
2144 if (err == 0)
2145 return datagrams;
2146
2147 if (datagrams != 0) {
2148 /*
2149 * We may return less entries than requested (vlen) if the
2150 * sock is non block and there aren't enough datagrams...
2151 */
2152 if (err != -EAGAIN) {
2153 /*
2154 * ... or if recvmsg returns an error after we
2155 * received some datagrams, where we record the
2156 * error to return on the next call or if the
2157 * app asks about it using getsockopt(SO_ERROR).
2158 */
2159 sock->sk->sk_err = -err;
2160 }
2161
2162 return datagrams;
2163 }
2164
2165 return err;
2166}
2167
2168SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2169 unsigned int, vlen, unsigned int, flags,
2170 struct timespec __user *, timeout)
2171{
2172 int datagrams;
2173 struct timespec timeout_sys;
2174
2175 if (!timeout)
2176 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2177
2178 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2179 return -EFAULT;
2180
2181 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2182
2183 if (datagrams > 0 &&
2184 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2185 datagrams = -EFAULT;
2186
2187 return datagrams;
2188}
2189
2190#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191/* Argument list sizes for sys_socketcall */
2192#define AL(x) ((x) * sizeof(unsigned long))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002193static const unsigned char nargs[20] = {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002194 AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
2195 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002196 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3),
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002197 AL(4),AL(5)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002198};
2199
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200#undef AL
2201
2202/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002203 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002204 *
2205 * Argument checking cleaned up. Saved 20% in size.
2206 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002207 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002208 */
2209
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002210SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002211{
2212 unsigned long a[6];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002213 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002215 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002216
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002217 if (call < 1 || call > SYS_RECVMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002218 return -EINVAL;
2219
Arjan van de Ven47379052009-09-28 12:57:44 -07002220 len = nargs[call];
2221 if (len > sizeof(a))
2222 return -EINVAL;
2223
Linus Torvalds1da177e2005-04-16 15:20:36 -07002224 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002225 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002226 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002227
Al Virof3298dc2008-12-10 03:16:51 -05002228 audit_socketcall(nargs[call] / sizeof(unsigned long), a);
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002229
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002230 a0 = a[0];
2231 a1 = a[1];
2232
2233 switch (call) {
2234 case SYS_SOCKET:
2235 err = sys_socket(a0, a1, a[2]);
2236 break;
2237 case SYS_BIND:
2238 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2239 break;
2240 case SYS_CONNECT:
2241 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2242 break;
2243 case SYS_LISTEN:
2244 err = sys_listen(a0, a1);
2245 break;
2246 case SYS_ACCEPT:
Ulrich Drepperde11def2008-11-19 15:36:14 -08002247 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2248 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002249 break;
2250 case SYS_GETSOCKNAME:
2251 err =
2252 sys_getsockname(a0, (struct sockaddr __user *)a1,
2253 (int __user *)a[2]);
2254 break;
2255 case SYS_GETPEERNAME:
2256 err =
2257 sys_getpeername(a0, (struct sockaddr __user *)a1,
2258 (int __user *)a[2]);
2259 break;
2260 case SYS_SOCKETPAIR:
2261 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2262 break;
2263 case SYS_SEND:
2264 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2265 break;
2266 case SYS_SENDTO:
2267 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2268 (struct sockaddr __user *)a[4], a[5]);
2269 break;
2270 case SYS_RECV:
2271 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2272 break;
2273 case SYS_RECVFROM:
2274 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2275 (struct sockaddr __user *)a[4],
2276 (int __user *)a[5]);
2277 break;
2278 case SYS_SHUTDOWN:
2279 err = sys_shutdown(a0, a1);
2280 break;
2281 case SYS_SETSOCKOPT:
2282 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2283 break;
2284 case SYS_GETSOCKOPT:
2285 err =
2286 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2287 (int __user *)a[4]);
2288 break;
2289 case SYS_SENDMSG:
2290 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2291 break;
2292 case SYS_RECVMSG:
2293 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2294 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002295 case SYS_RECVMMSG:
2296 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2297 (struct timespec __user *)a[4]);
2298 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002299 case SYS_ACCEPT4:
2300 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2301 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002302 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002303 default:
2304 err = -EINVAL;
2305 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002306 }
2307 return err;
2308}
2309
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002310#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002311
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002312/**
2313 * sock_register - add a socket protocol handler
2314 * @ops: description of protocol
2315 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002316 * This function is called by a protocol handler that wants to
2317 * advertise its address family, and have it linked into the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002318 * socket interface. The value ops->family coresponds to the
2319 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002320 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002321int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322{
2323 int err;
2324
2325 if (ops->family >= NPROTO) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002326 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
2327 NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002328 return -ENOBUFS;
2329 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002330
2331 spin_lock(&net_family_lock);
2332 if (net_families[ops->family])
2333 err = -EEXIST;
2334 else {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002335 net_families[ops->family] = ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002336 err = 0;
2337 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002338 spin_unlock(&net_family_lock);
2339
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002340 printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002341 return err;
2342}
2343
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002344/**
2345 * sock_unregister - remove a protocol handler
2346 * @family: protocol family to remove
2347 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348 * This function is called by a protocol handler that wants to
2349 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002350 * new socket creation.
2351 *
2352 * If protocol handler is a module, then it can use module reference
2353 * counts to protect against new references. If protocol handler is not
2354 * a module then it needs to provide its own protection in
2355 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002356 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002357void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002358{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002359 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002361 spin_lock(&net_family_lock);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002362 net_families[family] = NULL;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002363 spin_unlock(&net_family_lock);
2364
2365 synchronize_rcu();
2366
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002367 printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002368}
2369
Andi Kleen77d76ea2005-12-22 12:43:42 -08002370static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002371{
2372 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002373 * Initialize sock SLAB cache.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002374 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002375
Linus Torvalds1da177e2005-04-16 15:20:36 -07002376 sk_init();
2377
Linus Torvalds1da177e2005-04-16 15:20:36 -07002378 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002379 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002380 */
2381 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002382
2383 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002384 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002385 */
2386
2387 init_inodecache();
2388 register_filesystem(&sock_fs_type);
2389 sock_mnt = kern_mount(&sock_fs_type);
Andi Kleen77d76ea2005-12-22 12:43:42 -08002390
2391 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002392 */
2393
2394#ifdef CONFIG_NETFILTER
2395 netfilter_init();
2396#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002397
2398 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002399}
2400
Andi Kleen77d76ea2005-12-22 12:43:42 -08002401core_initcall(sock_init); /* early initcall */
2402
Linus Torvalds1da177e2005-04-16 15:20:36 -07002403#ifdef CONFIG_PROC_FS
2404void socket_seq_show(struct seq_file *seq)
2405{
2406 int cpu;
2407 int counter = 0;
2408
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07002409 for_each_possible_cpu(cpu)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002410 counter += per_cpu(sockets_in_use, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002411
2412 /* It can be negative, by the way. 8) */
2413 if (counter < 0)
2414 counter = 0;
2415
2416 seq_printf(seq, "sockets: used %d\n", counter);
2417}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002418#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002420#ifdef CONFIG_COMPAT
Arnd Bergmann6b960182009-11-06 23:10:54 -08002421static int do_siocgstamp(struct net *net, struct socket *sock,
2422 unsigned int cmd, struct compat_timeval __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002423{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002424 mm_segment_t old_fs = get_fs();
2425 struct timeval ktv;
2426 int err;
2427
2428 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002429 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002430 set_fs(old_fs);
2431 if (!err) {
2432 err = put_user(ktv.tv_sec, &up->tv_sec);
2433 err |= __put_user(ktv.tv_usec, &up->tv_usec);
2434 }
2435 return err;
2436}
2437
Arnd Bergmann6b960182009-11-06 23:10:54 -08002438static int do_siocgstampns(struct net *net, struct socket *sock,
2439 unsigned int cmd, struct compat_timespec __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002440{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002441 mm_segment_t old_fs = get_fs();
2442 struct timespec kts;
2443 int err;
2444
2445 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002446 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002447 set_fs(old_fs);
2448 if (!err) {
2449 err = put_user(kts.tv_sec, &up->tv_sec);
2450 err |= __put_user(kts.tv_nsec, &up->tv_nsec);
2451 }
2452 return err;
2453}
2454
Arnd Bergmann6b960182009-11-06 23:10:54 -08002455static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002456{
2457 struct ifreq __user *uifr;
2458 int err;
2459
2460 uifr = compat_alloc_user_space(sizeof(struct ifreq));
Arnd Bergmann6b960182009-11-06 23:10:54 -08002461 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002462 return -EFAULT;
2463
Arnd Bergmann6b960182009-11-06 23:10:54 -08002464 err = dev_ioctl(net, SIOCGIFNAME, uifr);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002465 if (err)
2466 return err;
2467
Arnd Bergmann6b960182009-11-06 23:10:54 -08002468 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002469 return -EFAULT;
2470
2471 return 0;
2472}
2473
Arnd Bergmann6b960182009-11-06 23:10:54 -08002474static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002475{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002476 struct compat_ifconf ifc32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002477 struct ifconf ifc;
2478 struct ifconf __user *uifc;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002479 struct compat_ifreq __user *ifr32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002480 struct ifreq __user *ifr;
2481 unsigned int i, j;
2482 int err;
2483
Arnd Bergmann6b960182009-11-06 23:10:54 -08002484 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002485 return -EFAULT;
2486
2487 if (ifc32.ifcbuf == 0) {
2488 ifc32.ifc_len = 0;
2489 ifc.ifc_len = 0;
2490 ifc.ifc_req = NULL;
2491 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2492 } else {
Arnd Bergmann6b960182009-11-06 23:10:54 -08002493 size_t len =((ifc32.ifc_len / sizeof (struct compat_ifreq)) + 1) *
Arnd Bergmann7a229382009-11-06 23:00:29 -08002494 sizeof (struct ifreq);
2495 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2496 ifc.ifc_len = len;
2497 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2498 ifr32 = compat_ptr(ifc32.ifcbuf);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002499 for (i = 0; i < ifc32.ifc_len; i += sizeof (struct compat_ifreq)) {
2500 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002501 return -EFAULT;
2502 ifr++;
2503 ifr32++;
2504 }
2505 }
2506 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2507 return -EFAULT;
2508
Arnd Bergmann6b960182009-11-06 23:10:54 -08002509 err = dev_ioctl(net, SIOCGIFCONF, uifc);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002510 if (err)
2511 return err;
2512
2513 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2514 return -EFAULT;
2515
2516 ifr = ifc.ifc_req;
2517 ifr32 = compat_ptr(ifc32.ifcbuf);
2518 for (i = 0, j = 0;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002519 i + sizeof (struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2520 i += sizeof (struct compat_ifreq), j += sizeof (struct ifreq)) {
2521 if (copy_in_user(ifr32, ifr, sizeof (struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002522 return -EFAULT;
2523 ifr32++;
2524 ifr++;
2525 }
2526
2527 if (ifc32.ifcbuf == 0) {
2528 /* Translate from 64-bit structure multiple to
2529 * a 32-bit one.
2530 */
2531 i = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002532 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
Arnd Bergmann7a229382009-11-06 23:00:29 -08002533 ifc32.ifc_len = i;
2534 } else {
2535 ifc32.ifc_len = i;
2536 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08002537 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002538 return -EFAULT;
2539
2540 return 0;
2541}
2542
Arnd Bergmann6b960182009-11-06 23:10:54 -08002543static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002544{
2545 struct ifreq __user *ifr;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002546 u32 data;
2547 void __user *datap;
2548
2549 ifr = compat_alloc_user_space(sizeof(*ifr));
Arnd Bergmann7a229382009-11-06 23:00:29 -08002550
2551 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2552 return -EFAULT;
2553
2554 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2555 return -EFAULT;
2556
2557 datap = compat_ptr(data);
2558 if (put_user(datap, &ifr->ifr_ifru.ifru_data))
2559 return -EFAULT;
2560
Arnd Bergmann6b960182009-11-06 23:10:54 -08002561 return dev_ioctl(net, SIOCETHTOOL, ifr);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002562}
2563
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002564static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2565{
2566 void __user *uptr;
2567 compat_uptr_t uptr32;
2568 struct ifreq __user *uifr;
2569
2570 uifr = compat_alloc_user_space(sizeof (*uifr));
2571 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2572 return -EFAULT;
2573
2574 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2575 return -EFAULT;
2576
2577 uptr = compat_ptr(uptr32);
2578
2579 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2580 return -EFAULT;
2581
2582 return dev_ioctl(net, SIOCWANDEV, uifr);
2583}
2584
Arnd Bergmann6b960182009-11-06 23:10:54 -08002585static int bond_ioctl(struct net *net, unsigned int cmd,
2586 struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002587{
2588 struct ifreq kifr;
2589 struct ifreq __user *uifr;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002590 mm_segment_t old_fs;
2591 int err;
2592 u32 data;
2593 void __user *datap;
2594
2595 switch (cmd) {
2596 case SIOCBONDENSLAVE:
2597 case SIOCBONDRELEASE:
2598 case SIOCBONDSETHWADDR:
2599 case SIOCBONDCHANGEACTIVE:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002600 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002601 return -EFAULT;
2602
2603 old_fs = get_fs();
2604 set_fs (KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002605 err = dev_ioctl(net, cmd, &kifr);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002606 set_fs (old_fs);
2607
2608 return err;
2609 case SIOCBONDSLAVEINFOQUERY:
2610 case SIOCBONDINFOQUERY:
2611 uifr = compat_alloc_user_space(sizeof(*uifr));
2612 if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2613 return -EFAULT;
2614
2615 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2616 return -EFAULT;
2617
2618 datap = compat_ptr(data);
2619 if (put_user(datap, &uifr->ifr_ifru.ifru_data))
2620 return -EFAULT;
2621
Arnd Bergmann6b960182009-11-06 23:10:54 -08002622 return dev_ioctl(net, cmd, uifr);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002623 default:
2624 return -EINVAL;
Joe Perchesccbd6a52010-05-14 10:58:26 +00002625 }
Arnd Bergmann7a229382009-11-06 23:00:29 -08002626}
2627
Arnd Bergmann6b960182009-11-06 23:10:54 -08002628static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
2629 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002630{
2631 struct ifreq __user *u_ifreq64;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002632 char tmp_buf[IFNAMSIZ];
2633 void __user *data64;
2634 u32 data32;
2635
2636 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
2637 IFNAMSIZ))
2638 return -EFAULT;
2639 if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
2640 return -EFAULT;
2641 data64 = compat_ptr(data32);
2642
2643 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
2644
2645 /* Don't check these user accesses, just let that get trapped
2646 * in the ioctl handler instead.
2647 */
2648 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
2649 IFNAMSIZ))
2650 return -EFAULT;
2651 if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
2652 return -EFAULT;
2653
Arnd Bergmann6b960182009-11-06 23:10:54 -08002654 return dev_ioctl(net, cmd, u_ifreq64);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002655}
2656
Arnd Bergmann6b960182009-11-06 23:10:54 -08002657static int dev_ifsioc(struct net *net, struct socket *sock,
2658 unsigned int cmd, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002659{
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002660 struct ifreq __user *uifr;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002661 int err;
2662
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002663 uifr = compat_alloc_user_space(sizeof(*uifr));
2664 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
2665 return -EFAULT;
2666
2667 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
2668
Arnd Bergmann7a229382009-11-06 23:00:29 -08002669 if (!err) {
2670 switch (cmd) {
2671 case SIOCGIFFLAGS:
2672 case SIOCGIFMETRIC:
2673 case SIOCGIFMTU:
2674 case SIOCGIFMEM:
2675 case SIOCGIFHWADDR:
2676 case SIOCGIFINDEX:
2677 case SIOCGIFADDR:
2678 case SIOCGIFBRDADDR:
2679 case SIOCGIFDSTADDR:
2680 case SIOCGIFNETMASK:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002681 case SIOCGIFPFLAGS:
Arnd Bergmann7a229382009-11-06 23:00:29 -08002682 case SIOCGIFTXQLEN:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002683 case SIOCGMIIPHY:
2684 case SIOCGMIIREG:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002685 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002686 err = -EFAULT;
2687 break;
2688 }
2689 }
2690 return err;
2691}
2692
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002693static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2694 struct compat_ifreq __user *uifr32)
2695{
2696 struct ifreq ifr;
2697 struct compat_ifmap __user *uifmap32;
2698 mm_segment_t old_fs;
2699 int err;
2700
2701 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2702 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
2703 err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2704 err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2705 err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2706 err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq);
2707 err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma);
2708 err |= __get_user(ifr.ifr_map.port, &uifmap32->port);
2709 if (err)
2710 return -EFAULT;
2711
2712 old_fs = get_fs();
2713 set_fs (KERNEL_DS);
2714 err = dev_ioctl(net, cmd, (void __user *)&ifr);
2715 set_fs (old_fs);
2716
2717 if (cmd == SIOCGIFMAP && !err) {
2718 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
2719 err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2720 err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2721 err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2722 err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq);
2723 err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma);
2724 err |= __put_user(ifr.ifr_map.port, &uifmap32->port);
2725 if (err)
2726 err = -EFAULT;
2727 }
2728 return err;
2729}
2730
2731static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32)
2732{
2733 void __user *uptr;
2734 compat_uptr_t uptr32;
2735 struct ifreq __user *uifr;
2736
2737 uifr = compat_alloc_user_space(sizeof (*uifr));
2738 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2739 return -EFAULT;
2740
2741 if (get_user(uptr32, &uifr32->ifr_data))
2742 return -EFAULT;
2743
2744 uptr = compat_ptr(uptr32);
2745
2746 if (put_user(uptr, &uifr->ifr_data))
2747 return -EFAULT;
2748
2749 return dev_ioctl(net, SIOCSHWTSTAMP, uifr);
2750}
2751
Arnd Bergmann7a229382009-11-06 23:00:29 -08002752struct rtentry32 {
2753 u32 rt_pad1;
2754 struct sockaddr rt_dst; /* target address */
2755 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
2756 struct sockaddr rt_genmask; /* target network mask (IP) */
2757 unsigned short rt_flags;
2758 short rt_pad2;
2759 u32 rt_pad3;
2760 unsigned char rt_tos;
2761 unsigned char rt_class;
2762 short rt_pad4;
2763 short rt_metric; /* +1 for binary compatibility! */
2764 /* char * */ u32 rt_dev; /* forcing the device at add */
2765 u32 rt_mtu; /* per route MTU/Window */
2766 u32 rt_window; /* Window clamping */
2767 unsigned short rt_irtt; /* Initial RTT */
2768};
2769
2770struct in6_rtmsg32 {
2771 struct in6_addr rtmsg_dst;
2772 struct in6_addr rtmsg_src;
2773 struct in6_addr rtmsg_gateway;
2774 u32 rtmsg_type;
2775 u16 rtmsg_dst_len;
2776 u16 rtmsg_src_len;
2777 u32 rtmsg_metric;
2778 u32 rtmsg_info;
2779 u32 rtmsg_flags;
2780 s32 rtmsg_ifindex;
2781};
2782
Arnd Bergmann6b960182009-11-06 23:10:54 -08002783static int routing_ioctl(struct net *net, struct socket *sock,
2784 unsigned int cmd, void __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002785{
2786 int ret;
2787 void *r = NULL;
2788 struct in6_rtmsg r6;
2789 struct rtentry r4;
2790 char devname[16];
2791 u32 rtdev;
2792 mm_segment_t old_fs = get_fs();
2793
Arnd Bergmann6b960182009-11-06 23:10:54 -08002794 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
2795 struct in6_rtmsg32 __user *ur6 = argp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002796 ret = copy_from_user (&r6.rtmsg_dst, &(ur6->rtmsg_dst),
2797 3 * sizeof(struct in6_addr));
2798 ret |= __get_user (r6.rtmsg_type, &(ur6->rtmsg_type));
2799 ret |= __get_user (r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
2800 ret |= __get_user (r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
2801 ret |= __get_user (r6.rtmsg_metric, &(ur6->rtmsg_metric));
2802 ret |= __get_user (r6.rtmsg_info, &(ur6->rtmsg_info));
2803 ret |= __get_user (r6.rtmsg_flags, &(ur6->rtmsg_flags));
2804 ret |= __get_user (r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
2805
2806 r = (void *) &r6;
2807 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08002808 struct rtentry32 __user *ur4 = argp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002809 ret = copy_from_user (&r4.rt_dst, &(ur4->rt_dst),
2810 3 * sizeof(struct sockaddr));
2811 ret |= __get_user (r4.rt_flags, &(ur4->rt_flags));
2812 ret |= __get_user (r4.rt_metric, &(ur4->rt_metric));
2813 ret |= __get_user (r4.rt_mtu, &(ur4->rt_mtu));
2814 ret |= __get_user (r4.rt_window, &(ur4->rt_window));
2815 ret |= __get_user (r4.rt_irtt, &(ur4->rt_irtt));
2816 ret |= __get_user (rtdev, &(ur4->rt_dev));
2817 if (rtdev) {
2818 ret |= copy_from_user (devname, compat_ptr(rtdev), 15);
2819 r4.rt_dev = devname; devname[15] = 0;
2820 } else
2821 r4.rt_dev = NULL;
2822
2823 r = (void *) &r4;
2824 }
2825
2826 if (ret) {
2827 ret = -EFAULT;
2828 goto out;
2829 }
2830
2831 set_fs (KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002832 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002833 set_fs (old_fs);
2834
2835out:
Arnd Bergmann7a229382009-11-06 23:00:29 -08002836 return ret;
2837}
2838
2839/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
2840 * for some operations; this forces use of the newer bridge-utils that
2841 * use compatiable ioctls
2842 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08002843static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002844{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002845 compat_ulong_t tmp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002846
Arnd Bergmann6b960182009-11-06 23:10:54 -08002847 if (get_user(tmp, argp))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002848 return -EFAULT;
2849 if (tmp == BRCTL_GET_VERSION)
2850 return BRCTL_VERSION + 1;
2851 return -EINVAL;
2852}
2853
Arnd Bergmann6b960182009-11-06 23:10:54 -08002854static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
2855 unsigned int cmd, unsigned long arg)
2856{
2857 void __user *argp = compat_ptr(arg);
2858 struct sock *sk = sock->sk;
2859 struct net *net = sock_net(sk);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002860
Arnd Bergmann6b960182009-11-06 23:10:54 -08002861 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
2862 return siocdevprivate_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002863
Arnd Bergmann6b960182009-11-06 23:10:54 -08002864 switch (cmd) {
2865 case SIOCSIFBR:
2866 case SIOCGIFBR:
2867 return old_bridge_ioctl(argp);
2868 case SIOCGIFNAME:
2869 return dev_ifname32(net, argp);
2870 case SIOCGIFCONF:
2871 return dev_ifconf(net, argp);
2872 case SIOCETHTOOL:
2873 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002874 case SIOCWANDEV:
2875 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002876 case SIOCGIFMAP:
2877 case SIOCSIFMAP:
2878 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002879 case SIOCBONDENSLAVE:
2880 case SIOCBONDRELEASE:
2881 case SIOCBONDSETHWADDR:
2882 case SIOCBONDSLAVEINFOQUERY:
2883 case SIOCBONDINFOQUERY:
2884 case SIOCBONDCHANGEACTIVE:
2885 return bond_ioctl(net, cmd, argp);
2886 case SIOCADDRT:
2887 case SIOCDELRT:
2888 return routing_ioctl(net, sock, cmd, argp);
2889 case SIOCGSTAMP:
2890 return do_siocgstamp(net, sock, cmd, argp);
2891 case SIOCGSTAMPNS:
2892 return do_siocgstampns(net, sock, cmd, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002893 case SIOCSHWTSTAMP:
2894 return compat_siocshwtstamp(net, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002895
Arnd Bergmann6b960182009-11-06 23:10:54 -08002896 case FIOSETOWN:
2897 case SIOCSPGRP:
2898 case FIOGETOWN:
2899 case SIOCGPGRP:
2900 case SIOCBRADDBR:
2901 case SIOCBRDELBR:
2902 case SIOCGIFVLAN:
2903 case SIOCSIFVLAN:
2904 case SIOCADDDLCI:
2905 case SIOCDELDLCI:
2906 return sock_ioctl(file, cmd, arg);
2907
2908 case SIOCGIFFLAGS:
2909 case SIOCSIFFLAGS:
2910 case SIOCGIFMETRIC:
2911 case SIOCSIFMETRIC:
2912 case SIOCGIFMTU:
2913 case SIOCSIFMTU:
2914 case SIOCGIFMEM:
2915 case SIOCSIFMEM:
2916 case SIOCGIFHWADDR:
2917 case SIOCSIFHWADDR:
2918 case SIOCADDMULTI:
2919 case SIOCDELMULTI:
2920 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002921 case SIOCGIFADDR:
2922 case SIOCSIFADDR:
2923 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002924 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002925 case SIOCGIFBRDADDR:
2926 case SIOCSIFBRDADDR:
2927 case SIOCGIFDSTADDR:
2928 case SIOCSIFDSTADDR:
2929 case SIOCGIFNETMASK:
2930 case SIOCSIFNETMASK:
2931 case SIOCSIFPFLAGS:
2932 case SIOCGIFPFLAGS:
2933 case SIOCGIFTXQLEN:
2934 case SIOCSIFTXQLEN:
2935 case SIOCBRADDIF:
2936 case SIOCBRDELIF:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00002937 case SIOCSIFNAME:
2938 case SIOCGMIIPHY:
2939 case SIOCGMIIREG:
2940 case SIOCSMIIREG:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002941 return dev_ifsioc(net, sock, cmd, argp);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00002942
Arnd Bergmann6b960182009-11-06 23:10:54 -08002943 case SIOCSARP:
2944 case SIOCGARP:
2945 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002946 case SIOCATMARK:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00002947 return sock_do_ioctl(net, sock, cmd, arg);
2948 }
2949
2950 /* Prevent warning from compat_sys_ioctl, these always
2951 * result in -EINVAL in the native case anyway. */
2952 switch (cmd) {
2953 case SIOCRTMSG:
2954 case SIOCGIFCOUNT:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002955 case SIOCSRARP:
2956 case SIOCGRARP:
2957 case SIOCDRARP:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00002958 case SIOCSIFLINK:
2959 case SIOCGIFSLAVE:
2960 case SIOCSIFSLAVE:
2961 return -EINVAL;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002962 }
2963
2964 return -ENOIOCTLCMD;
2965}
Arnd Bergmann7a229382009-11-06 23:00:29 -08002966
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002967static long compat_sock_ioctl(struct file *file, unsigned cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002968 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002969{
2970 struct socket *sock = file->private_data;
2971 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07002972 struct sock *sk;
2973 struct net *net;
2974
2975 sk = sock->sk;
2976 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002977
2978 if (sock->ops->compat_ioctl)
2979 ret = sock->ops->compat_ioctl(sock, cmd, arg);
2980
David S. Miller87de87d2008-06-03 09:14:03 -07002981 if (ret == -ENOIOCTLCMD &&
2982 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
2983 ret = compat_wext_handle_ioctl(net, cmd, arg);
2984
Arnd Bergmann6b960182009-11-06 23:10:54 -08002985 if (ret == -ENOIOCTLCMD)
2986 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
2987
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002988 return ret;
2989}
2990#endif
2991
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07002992int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
2993{
2994 return sock->ops->bind(sock, addr, addrlen);
2995}
2996
2997int kernel_listen(struct socket *sock, int backlog)
2998{
2999 return sock->ops->listen(sock, backlog);
3000}
3001
3002int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3003{
3004 struct sock *sk = sock->sk;
3005 int err;
3006
3007 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3008 newsock);
3009 if (err < 0)
3010 goto done;
3011
3012 err = sock->ops->accept(sock, *newsock, flags);
3013 if (err < 0) {
3014 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003015 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003016 goto done;
3017 }
3018
3019 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003020 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003021
3022done:
3023 return err;
3024}
3025
3026int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003027 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003028{
3029 return sock->ops->connect(sock, addr, addrlen, flags);
3030}
3031
3032int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3033 int *addrlen)
3034{
3035 return sock->ops->getname(sock, addr, addrlen, 0);
3036}
3037
3038int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3039 int *addrlen)
3040{
3041 return sock->ops->getname(sock, addr, addrlen, 1);
3042}
3043
3044int kernel_getsockopt(struct socket *sock, int level, int optname,
3045 char *optval, int *optlen)
3046{
3047 mm_segment_t oldfs = get_fs();
3048 int err;
3049
3050 set_fs(KERNEL_DS);
3051 if (level == SOL_SOCKET)
3052 err = sock_getsockopt(sock, level, optname, optval, optlen);
3053 else
3054 err = sock->ops->getsockopt(sock, level, optname, optval,
3055 optlen);
3056 set_fs(oldfs);
3057 return err;
3058}
3059
3060int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003061 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003062{
3063 mm_segment_t oldfs = get_fs();
3064 int err;
3065
3066 set_fs(KERNEL_DS);
3067 if (level == SOL_SOCKET)
3068 err = sock_setsockopt(sock, level, optname, optval, optlen);
3069 else
3070 err = sock->ops->setsockopt(sock, level, optname, optval,
3071 optlen);
3072 set_fs(oldfs);
3073 return err;
3074}
3075
3076int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3077 size_t size, int flags)
3078{
Herbert Xuf8451722010-05-24 00:12:34 -07003079 sock_update_classid(sock->sk);
3080
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003081 if (sock->ops->sendpage)
3082 return sock->ops->sendpage(sock, page, offset, size, flags);
3083
3084 return sock_no_sendpage(sock, page, offset, size, flags);
3085}
3086
3087int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3088{
3089 mm_segment_t oldfs = get_fs();
3090 int err;
3091
3092 set_fs(KERNEL_DS);
3093 err = sock->ops->ioctl(sock, cmd, arg);
3094 set_fs(oldfs);
3095
3096 return err;
3097}
3098
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003099int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3100{
3101 return sock->ops->shutdown(sock, how);
3102}
3103
Linus Torvalds1da177e2005-04-16 15:20:36 -07003104EXPORT_SYMBOL(sock_create);
3105EXPORT_SYMBOL(sock_create_kern);
3106EXPORT_SYMBOL(sock_create_lite);
3107EXPORT_SYMBOL(sock_map_fd);
3108EXPORT_SYMBOL(sock_recvmsg);
3109EXPORT_SYMBOL(sock_register);
3110EXPORT_SYMBOL(sock_release);
3111EXPORT_SYMBOL(sock_sendmsg);
3112EXPORT_SYMBOL(sock_unregister);
3113EXPORT_SYMBOL(sock_wake_async);
3114EXPORT_SYMBOL(sockfd_lookup);
3115EXPORT_SYMBOL(kernel_sendmsg);
3116EXPORT_SYMBOL(kernel_recvmsg);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003117EXPORT_SYMBOL(kernel_bind);
3118EXPORT_SYMBOL(kernel_listen);
3119EXPORT_SYMBOL(kernel_accept);
3120EXPORT_SYMBOL(kernel_connect);
3121EXPORT_SYMBOL(kernel_getsockname);
3122EXPORT_SYMBOL(kernel_getpeername);
3123EXPORT_SYMBOL(kernel_getsockopt);
3124EXPORT_SYMBOL(kernel_setsockopt);
3125EXPORT_SYMBOL(kernel_sendpage);
3126EXPORT_SYMBOL(kernel_sock_ioctl);
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003127EXPORT_SYMBOL(kernel_sock_shutdown);