blob: 310d16b1b3c9cbbb1d401f19f24c6a61d0df4404 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NET An implementation of the SOCKET network access protocol.
3 *
4 * Version: @(#)socket.c 1.1.93 18/02/95
5 *
6 * Authors: Orest Zborowski, <obz@Kodak.COM>
Jesper Juhl02c30a82005-05-05 16:16:16 -07007 * Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
9 *
10 * Fixes:
11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
12 * shutdown()
13 * Alan Cox : verify_area() fixes
14 * Alan Cox : Removed DDI
15 * Jonathan Kamens : SOCK_DGRAM reconnect bug
16 * Alan Cox : Moved a load of checks to the very
17 * top level.
18 * Alan Cox : Move address structures to/from user
19 * mode above the protocol layers.
20 * Rob Janssen : Allow 0 length sends.
21 * Alan Cox : Asynchronous I/O support (cribbed from the
22 * tty drivers).
23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
24 * Jeff Uphoff : Made max number of sockets command-line
25 * configurable.
26 * Matti Aarnio : Made the number of sockets dynamic,
27 * to be allocated when needed, and mr.
28 * Uphoff's max is used as max to be
29 * allowed to allocate.
30 * Linus : Argh. removed all the socket allocation
31 * altogether: it's in the inode now.
32 * Alan Cox : Made sock_alloc()/sock_release() public
33 * for NetROM and future kernel nfsd type
34 * stuff.
35 * Alan Cox : sendmsg/recvmsg basics.
36 * Tom Dyas : Export net symbols.
37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
38 * Alan Cox : Added thread locking to sys_* calls
39 * for sockets. May have errors at the
40 * moment.
41 * Kevin Buhr : Fixed the dumb errors in the above.
42 * Andi Kleen : Some small cleanups, optimizations,
43 * and fixed a copy_from_user() bug.
44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
Stephen Hemminger89bddce2006-09-01 00:19:31 -070045 * Tigran Aivazian : Made listen(2) backlog sanity checks
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 * protocol-independent
47 *
48 *
49 * This program is free software; you can redistribute it and/or
50 * modify it under the terms of the GNU General Public License
51 * as published by the Free Software Foundation; either version
52 * 2 of the License, or (at your option) any later version.
53 *
54 *
55 * This module is effectively the top level interface to the BSD socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -070056 * paradigm.
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 *
58 * Based upon Swansea University Computer Society NET3.039
59 */
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/socket.h>
63#include <linux/file.h>
64#include <linux/net.h>
65#include <linux/interrupt.h>
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -070066#include <linux/thread_info.h>
Stephen Hemminger55737fd2006-09-01 00:23:39 -070067#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <linux/netdevice.h>
69#include <linux/proc_fs.h>
70#include <linux/seq_file.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080071#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#include <linux/wanrouter.h>
73#include <linux/if_bridge.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030074#include <linux/if_frad.h>
75#include <linux/if_vlan.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#include <linux/init.h>
77#include <linux/poll.h>
78#include <linux/cache.h>
79#include <linux/module.h>
80#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#include <linux/mount.h>
82#include <linux/security.h>
83#include <linux/syscalls.h>
84#include <linux/compat.h>
85#include <linux/kmod.h>
David Woodhouse3ec3b2f2005-05-17 12:08:48 +010086#include <linux/audit.h>
Adrian Bunkd86b5e02006-01-21 00:46:55 +010087#include <linux/wireless.h>
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -070088#include <linux/nsproxy.h>
Nick Black1fd7317d2009-09-22 16:43:33 -070089#include <linux/magic.h>
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,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700127 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800128 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);
Eric Dumazet190683a2010-11-10 10:50:44 +0000159static const struct net_proto_family __rcu *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
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700165static DEFINE_PER_CPU(int, sockets_in_use);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173/**
174 * move_addr_to_kernel - copy a socket address into kernel space
175 * @uaddr: Address in user space
176 * @kaddr: Address in kernel space
177 * @ulen: Length in user space
178 *
179 * The address is copied into kernel space. If the provided address is
180 * too long an error code of -EINVAL is returned. If the copy gives
181 * invalid addresses -EFAULT is returned. On a success 0 is returned.
182 */
183
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700184int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185{
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700186 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700188 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700190 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100192 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
195/**
196 * move_addr_to_user - copy an address to user space
197 * @kaddr: kernel space address
198 * @klen: length of address in kernel
199 * @uaddr: user space address
200 * @ulen: pointer to user length field
201 *
202 * The value pointed to by ulen on entry is the buffer length available.
203 * This is overwritten with the buffer space used. -EINVAL is returned
204 * if an overlong buffer is specified or a negative buffer size. -EFAULT
205 * is returned if either the buffer or the length field are not
206 * accessible.
207 * After copying the data up to the limit the user specifies, the true
208 * length of the data is written over the length limit the user
209 * specified. Zero is returned for a success.
210 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700211
stephen hemminger11165f12010-10-18 14:27:29 +0000212static int move_addr_to_user(struct sockaddr *kaddr, int klen,
213 void __user *uaddr, int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214{
215 int err;
216 int len;
217
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700218 err = get_user(len, ulen);
219 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700221 if (len > klen)
222 len = klen;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700223 if (len < 0 || len > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700225 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500226 if (audit_sockaddr(klen, kaddr))
227 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700228 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 return -EFAULT;
230 }
231 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700232 * "fromlen shall refer to the value before truncation.."
233 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 */
235 return __put_user(klen, ulen);
236}
237
Christoph Lametere18b8902006-12-06 20:33:20 -0800238static struct kmem_cache *sock_inode_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
240static struct inode *sock_alloc_inode(struct super_block *sb)
241{
242 struct socket_alloc *ei;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000243 struct socket_wq *wq;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700244
Christoph Lametere94b1762006-12-06 20:33:17 -0800245 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 if (!ei)
247 return NULL;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000248 wq = kmalloc(sizeof(*wq), GFP_KERNEL);
249 if (!wq) {
Eric Dumazet43815482010-04-29 11:01:49 +0000250 kmem_cache_free(sock_inode_cachep, ei);
251 return NULL;
252 }
Eric Dumazeteaefd112011-02-18 03:26:36 +0000253 init_waitqueue_head(&wq->wait);
254 wq->fasync_list = NULL;
255 RCU_INIT_POINTER(ei->socket.wq, wq);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 ei->socket.state = SS_UNCONNECTED;
258 ei->socket.flags = 0;
259 ei->socket.ops = NULL;
260 ei->socket.sk = NULL;
261 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263 return &ei->vfs_inode;
264}
265
Eric Dumazet43815482010-04-29 11:01:49 +0000266
Eric Dumazet43815482010-04-29 11:01:49 +0000267
Eric Dumazet43815482010-04-29 11:01:49 +0000268static void wq_free_rcu(struct rcu_head *head)
269{
270 struct socket_wq *wq = container_of(head, struct socket_wq, rcu);
271
272 kfree(wq);
273}
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275static void sock_destroy_inode(struct inode *inode)
276{
Eric Dumazet43815482010-04-29 11:01:49 +0000277 struct socket_alloc *ei;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000278 struct socket_wq *wq;
Eric Dumazet43815482010-04-29 11:01:49 +0000279
280 ei = container_of(inode, struct socket_alloc, vfs_inode);
Eric Dumazeteaefd112011-02-18 03:26:36 +0000281 wq = rcu_dereference_protected(ei->socket.wq, 1);
282 call_rcu(&wq->rcu, wq_free_rcu);
Eric Dumazet43815482010-04-29 11:01:49 +0000283 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284}
285
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700286static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700288 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Christoph Lametera35afb82007-05-16 22:10:57 -0700290 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293static int init_inodecache(void)
294{
295 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700296 sizeof(struct socket_alloc),
297 0,
298 (SLAB_HWCACHE_ALIGN |
299 SLAB_RECLAIM_ACCOUNT |
300 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900301 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 if (sock_inode_cachep == NULL)
303 return -ENOMEM;
304 return 0;
305}
306
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700307static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700308 .alloc_inode = sock_alloc_inode,
309 .destroy_inode = sock_destroy_inode,
310 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311};
312
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700313/*
314 * sockfs_dname() is called from d_path().
315 */
316static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
317{
318 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
319 dentry->d_inode->i_ino);
320}
321
Al Viro3ba13d12009-02-20 06:02:22 +0000322static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700323 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324};
325
Al Viroc74a1cb2011-01-12 16:59:34 -0500326static struct dentry *sockfs_mount(struct file_system_type *fs_type,
327 int flags, const char *dev_name, void *data)
328{
329 return mount_pseudo(fs_type, "socket:", &sockfs_ops,
330 &sockfs_dentry_operations, SOCKFS_MAGIC);
331}
332
333static struct vfsmount *sock_mnt __read_mostly;
334
335static struct file_system_type sock_fs_type = {
336 .name = "sockfs",
337 .mount = sockfs_mount,
338 .kill_sb = kill_anon_super,
339};
340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341/*
342 * Obtains the first available file descriptor and sets it up for use.
343 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800344 * These functions create file structures and maps them to fd space
345 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 * and file struct implicitly stored in sock->file.
347 * Note that another thread may close file descriptor before we return
348 * from this function. We use the fact that now we do not refer
349 * to socket after mapping. If one day we will need it, this
350 * function will increment ref. count on file by 1.
351 *
352 * In any case returned fd MAY BE not valid!
353 * This race condition is unavoidable
354 * with shared fd spaces, we cannot solve it inside kernel,
355 * but we take care of internal coherence yet.
356 */
357
Al Viro7cbe66b2009-08-05 19:59:08 +0400358static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359{
Al Viro7cbe66b2009-08-05 19:59:08 +0400360 struct qstr name = { .name = "" };
Al Viro2c48b9c2009-08-09 00:52:35 +0400361 struct path path;
Al Viro7cbe66b2009-08-05 19:59:08 +0400362 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 int fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800364
Ulrich Dreppera677a032008-07-23 21:29:17 -0700365 fd = get_unused_fd_flags(flags);
Al Viro7cbe66b2009-08-05 19:59:08 +0400366 if (unlikely(fd < 0))
367 return fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800368
Nick Piggin4b936882011-01-07 17:50:07 +1100369 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
Al Viro2c48b9c2009-08-09 00:52:35 +0400370 if (unlikely(!path.dentry)) {
Al Viro7cbe66b2009-08-05 19:59:08 +0400371 put_unused_fd(fd);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800372 return -ENOMEM;
Al Viro7cbe66b2009-08-05 19:59:08 +0400373 }
Al Viro2c48b9c2009-08-09 00:52:35 +0400374 path.mnt = mntget(sock_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
Al Viro2c48b9c2009-08-09 00:52:35 +0400376 d_instantiate(path.dentry, SOCK_INODE(sock));
Al Virocc3808f2009-08-06 09:43:59 +0400377 SOCK_INODE(sock)->i_fop = &socket_file_ops;
378
Al Viro2c48b9c2009-08-09 00:52:35 +0400379 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
Al Virocc3808f2009-08-06 09:43:59 +0400380 &socket_file_ops);
381 if (unlikely(!file)) {
382 /* drop dentry, keep inode */
Al Viro7de9c6ee2010-10-23 11:11:40 -0400383 ihold(path.dentry->d_inode);
Al Viro2c48b9c2009-08-09 00:52:35 +0400384 path_put(&path);
Al Virocc3808f2009-08-06 09:43:59 +0400385 put_unused_fd(fd);
386 return -ENFILE;
387 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800388
389 sock->file = file;
Ulrich Drepper77d27202008-07-23 21:29:35 -0700390 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800391 file->f_pos = 0;
392 file->private_data = sock;
393
Al Viro7cbe66b2009-08-05 19:59:08 +0400394 *f = file;
395 return fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800396}
397
Ulrich Dreppera677a032008-07-23 21:29:17 -0700398int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800399{
400 struct file *newfile;
Al Viro7cbe66b2009-08-05 19:59:08 +0400401 int fd = sock_alloc_file(sock, &newfile, flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800402
Al Viro7cbe66b2009-08-05 19:59:08 +0400403 if (likely(fd >= 0))
David S. Miller39d8c1b2006-03-20 17:13:49 -0800404 fd_install(fd, newfile);
Al Viro7cbe66b2009-08-05 19:59:08 +0400405
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 return fd;
407}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700408EXPORT_SYMBOL(sock_map_fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800410static struct socket *sock_from_file(struct file *file, int *err)
411{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800412 if (file->f_op == &socket_file_ops)
413 return file->private_data; /* set in sock_map_fd */
414
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800415 *err = -ENOTSOCK;
416 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800417}
418
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700420 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 * @fd: file handle
422 * @err: pointer to an error code return
423 *
424 * The file handle passed in is locked and the socket it is bound
425 * too is returned. If an error occurs the err pointer is overwritten
426 * with a negative errno code and NULL is returned. The function checks
427 * for both invalid handles and passing a handle which is not a socket.
428 *
429 * On a success the socket object pointer is returned.
430 */
431
432struct socket *sockfd_lookup(int fd, int *err)
433{
434 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 struct socket *sock;
436
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700437 file = fget(fd);
438 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 *err = -EBADF;
440 return NULL;
441 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700442
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800443 sock = sock_from_file(file, err);
444 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 return sock;
447}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700448EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800450static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
451{
452 struct file *file;
453 struct socket *sock;
454
Hua Zhong36725582006-04-19 15:25:02 -0700455 *err = -EBADF;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800456 file = fget_light(fd, fput_needed);
457 if (file) {
458 sock = sock_from_file(file, err);
459 if (sock)
460 return sock;
461 fput_light(file, *fput_needed);
462 }
463 return NULL;
464}
465
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466/**
467 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700468 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 * Allocate a new inode and socket object. The two are bound together
470 * and initialised. The socket is then returned. If we are out of inodes
471 * NULL is returned.
472 */
473
474static struct socket *sock_alloc(void)
475{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700476 struct inode *inode;
477 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
479 inode = new_inode(sock_mnt->mnt_sb);
480 if (!inode)
481 return NULL;
482
483 sock = SOCKET_I(inode);
484
Eric Dumazet29a020d2009-09-15 02:39:20 -0700485 kmemcheck_annotate_bitfield(sock, type);
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400486 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700487 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100488 inode->i_uid = current_fsuid();
489 inode->i_gid = current_fsgid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
Eric Dumazet4e694892009-04-04 16:41:09 -0700491 percpu_add(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 return sock;
493}
494
495/*
496 * In theory you can't get an open on this inode, but /proc provides
497 * a back door. Remember to keep it shut otherwise you'll let the
498 * creepy crawlies in.
499 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
502{
503 return -ENXIO;
504}
505
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800506const struct file_operations bad_sock_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 .owner = THIS_MODULE,
508 .open = sock_no_open,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200509 .llseek = noop_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510};
511
512/**
513 * sock_release - close a socket
514 * @sock: socket to close
515 *
516 * The socket is released from the protocol stack if it has a release
517 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700518 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700520
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521void sock_release(struct socket *sock)
522{
523 if (sock->ops) {
524 struct module *owner = sock->ops->owner;
525
526 sock->ops->release(sock);
527 sock->ops = NULL;
528 module_put(owner);
529 }
530
Eric Dumazeteaefd112011-02-18 03:26:36 +0000531 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 printk(KERN_ERR "sock_release: fasync list not empty!\n");
533
Eric Dumazet4e694892009-04-04 16:41:09 -0700534 percpu_sub(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 if (!sock->file) {
536 iput(SOCK_INODE(sock));
537 return;
538 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700539 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700541EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000543int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000544{
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000545 *tx_flags = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000546 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000547 *tx_flags |= SKBTX_HW_TSTAMP;
Patrick Ohly20d49472009-02-12 05:03:38 +0000548 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000549 *tx_flags |= SKBTX_SW_TSTAMP;
Patrick Ohly20d49472009-02-12 05:03:38 +0000550 return 0;
551}
552EXPORT_SYMBOL(sock_tx_timestamp);
553
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700554static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 struct msghdr *msg, size_t size)
556{
557 struct sock_iocb *si = kiocb_to_siocb(iocb);
558 int err;
559
Herbert Xuf8451722010-05-24 00:12:34 -0700560 sock_update_classid(sock->sk);
561
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 si->sock = sock;
563 si->scm = NULL;
564 si->msg = msg;
565 si->size = size;
566
567 err = security_socket_sendmsg(sock, msg, size);
568 if (err)
569 return err;
570
571 return sock->ops->sendmsg(iocb, sock, msg, size);
572}
573
574int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
575{
576 struct kiocb iocb;
577 struct sock_iocb siocb;
578 int ret;
579
580 init_sync_kiocb(&iocb, NULL);
581 iocb.private = &siocb;
582 ret = __sock_sendmsg(&iocb, sock, msg, size);
583 if (-EIOCBQUEUED == ret)
584 ret = wait_on_sync_kiocb(&iocb);
585 return ret;
586}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700587EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
589int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
590 struct kvec *vec, size_t num, size_t size)
591{
592 mm_segment_t oldfs = get_fs();
593 int result;
594
595 set_fs(KERNEL_DS);
596 /*
597 * the following is safe, since for compiler definitions of kvec and
598 * iovec are identical, yielding the same in-core layout and alignment
599 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700600 msg->msg_iov = (struct iovec *)vec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 msg->msg_iovlen = num;
602 result = sock_sendmsg(sock, msg, size);
603 set_fs(oldfs);
604 return result;
605}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700606EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
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}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300667EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
668
stephen hemminger11165f12010-10-18 14:27:29 +0000669static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
670 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700671{
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}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700723EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700725static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
726 size_t size, int flags)
727{
728 struct kiocb iocb;
729 struct sock_iocb siocb;
730 int ret;
731
732 init_sync_kiocb(&iocb, NULL);
733 iocb.private = &siocb;
734 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
735 if (-EIOCBQUEUED == ret)
736 ret = wait_on_sync_kiocb(&iocb);
737 return ret;
738}
739
Martin Lucinac1249c02010-12-10 00:04:05 +0000740/**
741 * kernel_recvmsg - Receive a message from a socket (kernel space)
742 * @sock: The socket to receive the message from
743 * @msg: Received message
744 * @vec: Input s/g array for message data
745 * @num: Size of input s/g array
746 * @size: Number of bytes to read
747 * @flags: Message flags (MSG_DONTWAIT, etc...)
748 *
749 * On return the msg structure contains the scatter/gather array passed in the
750 * vec argument. The array is modified so that it consists of the unfilled
751 * portion of the original array.
752 *
753 * The returned value is the total number of bytes received, or an error.
754 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700755int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
756 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757{
758 mm_segment_t oldfs = get_fs();
759 int result;
760
761 set_fs(KERNEL_DS);
762 /*
763 * the following is safe, since for compiler definitions of kvec and
764 * iovec are identical, yielding the same in-core layout and alignment
765 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700766 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 result = sock_recvmsg(sock, msg, size, flags);
768 set_fs(oldfs);
769 return result;
770}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700771EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
773static void sock_aio_dtor(struct kiocb *iocb)
774{
775 kfree(iocb->private);
776}
777
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300778static ssize_t sock_sendpage(struct file *file, struct page *page,
779 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780{
781 struct socket *sock;
782 int flags;
783
Eric Dumazetb69aee02005-09-06 14:42:45 -0700784 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785
786 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
787 if (more)
788 flags |= MSG_MORE;
789
Linus Torvaldse6949582009-08-13 08:28:36 -0700790 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791}
792
Jens Axboe9c55e012007-11-06 23:30:13 -0800793static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700794 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800795 unsigned int flags)
796{
797 struct socket *sock = file->private_data;
798
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800799 if (unlikely(!sock->ops->splice_read))
800 return -EINVAL;
801
Herbert Xuf8451722010-05-24 00:12:34 -0700802 sock_update_classid(sock->sk);
803
Jens Axboe9c55e012007-11-06 23:30:13 -0800804 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
805}
806
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800807static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700808 struct sock_iocb *siocb)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800809{
810 if (!is_sync_kiocb(iocb)) {
811 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
812 if (!siocb)
813 return NULL;
814 iocb->ki_dtor = sock_aio_dtor;
815 }
816
817 siocb->kiocb = iocb;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800818 iocb->private = siocb;
819 return siocb;
820}
821
822static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700823 struct file *file, const struct iovec *iov,
824 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800825{
826 struct socket *sock = file->private_data;
827 size_t size = 0;
828 int i;
829
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700830 for (i = 0; i < nr_segs; i++)
831 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800832
833 msg->msg_name = NULL;
834 msg->msg_namelen = 0;
835 msg->msg_control = NULL;
836 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700837 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800838 msg->msg_iovlen = nr_segs;
839 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
840
841 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
842}
843
Badari Pulavarty027445c2006-09-30 23:28:46 -0700844static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
845 unsigned long nr_segs, loff_t pos)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800846{
847 struct sock_iocb siocb, *x;
848
849 if (pos != 0)
850 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700851
852 if (iocb->ki_left == 0) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800853 return 0;
854
Badari Pulavarty027445c2006-09-30 23:28:46 -0700855
856 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800857 if (!x)
858 return -ENOMEM;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700859 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800860}
861
862static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700863 struct file *file, const struct iovec *iov,
864 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800865{
866 struct socket *sock = file->private_data;
867 size_t size = 0;
868 int i;
869
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700870 for (i = 0; i < nr_segs; i++)
871 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800872
873 msg->msg_name = NULL;
874 msg->msg_namelen = 0;
875 msg->msg_control = NULL;
876 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700877 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800878 msg->msg_iovlen = nr_segs;
879 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
880 if (sock->type == SOCK_SEQPACKET)
881 msg->msg_flags |= MSG_EOR;
882
883 return __sock_sendmsg(iocb, sock, msg, size);
884}
885
Badari Pulavarty027445c2006-09-30 23:28:46 -0700886static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
887 unsigned long nr_segs, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888{
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800889 struct sock_iocb siocb, *x;
890
891 if (pos != 0)
892 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700893
Badari Pulavarty027445c2006-09-30 23:28:46 -0700894 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800895 if (!x)
896 return -ENOMEM;
897
Badari Pulavarty027445c2006-09-30 23:28:46 -0700898 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899}
900
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901/*
902 * Atomic setting of ioctl hooks to avoid race
903 * with module unload.
904 */
905
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800906static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700907static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
Eric W. Biederman881d9662007-09-17 11:56:21 -0700909void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800911 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800913 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914}
915EXPORT_SYMBOL(brioctl_set);
916
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800917static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700918static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
Eric W. Biederman881d9662007-09-17 11:56:21 -0700920void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800922 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800924 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925}
926EXPORT_SYMBOL(vlan_ioctl_set);
927
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800928static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700929static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700931void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800933 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800935 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936}
937EXPORT_SYMBOL(dlci_ioctl_set);
938
Arnd Bergmann6b960182009-11-06 23:10:54 -0800939static long sock_do_ioctl(struct net *net, struct socket *sock,
940 unsigned int cmd, unsigned long arg)
941{
942 int err;
943 void __user *argp = (void __user *)arg;
944
945 err = sock->ops->ioctl(sock, cmd, arg);
946
947 /*
948 * If this ioctl is unknown try to hand it down
949 * to the NIC driver.
950 */
951 if (err == -ENOIOCTLCMD)
952 err = dev_ioctl(net, cmd, argp);
953
954 return err;
955}
956
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957/*
958 * With an ioctl, arg may well be a user mode pointer, but we don't know
959 * what to do with it - that's up to the protocol still.
960 */
961
962static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
963{
964 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700965 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 void __user *argp = (void __user *)arg;
967 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700968 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
Eric Dumazetb69aee02005-09-06 14:42:45 -0700970 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700971 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900972 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700974 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 } else
Johannes Berg3d23e342009-09-29 23:27:28 +0200976#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700978 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 } else
Johannes Berg3d23e342009-09-29 23:27:28 +0200980#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700981 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 case FIOSETOWN:
983 case SIOCSPGRP:
984 err = -EFAULT;
985 if (get_user(pid, (int __user *)argp))
986 break;
987 err = f_setown(sock->file, pid, 1);
988 break;
989 case FIOGETOWN:
990 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700991 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700992 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 break;
994 case SIOCGIFBR:
995 case SIOCSIFBR:
996 case SIOCBRADDBR:
997 case SIOCBRDELBR:
998 err = -ENOPKG;
999 if (!br_ioctl_hook)
1000 request_module("bridge");
1001
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001002 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001003 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001004 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001005 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 break;
1007 case SIOCGIFVLAN:
1008 case SIOCSIFVLAN:
1009 err = -ENOPKG;
1010 if (!vlan_ioctl_hook)
1011 request_module("8021q");
1012
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001013 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001015 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001016 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 case SIOCADDDLCI:
1019 case SIOCDELDLCI:
1020 err = -ENOPKG;
1021 if (!dlci_ioctl_hook)
1022 request_module("dlci");
1023
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001024 mutex_lock(&dlci_ioctl_mutex);
1025 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001027 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 break;
1029 default:
Arnd Bergmann6b960182009-11-06 23:10:54 -08001030 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001032 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 return err;
1034}
1035
1036int sock_create_lite(int family, int type, int protocol, struct socket **res)
1037{
1038 int err;
1039 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001040
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 err = security_socket_create(family, type, protocol, 1);
1042 if (err)
1043 goto out;
1044
1045 sock = sock_alloc();
1046 if (!sock) {
1047 err = -ENOMEM;
1048 goto out;
1049 }
1050
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001052 err = security_socket_post_create(sock, family, type, protocol, 1);
1053 if (err)
1054 goto out_release;
1055
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056out:
1057 *res = sock;
1058 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001059out_release:
1060 sock_release(sock);
1061 sock = NULL;
1062 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001064EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065
1066/* No kernel lock held - perfect */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001067static unsigned int sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068{
1069 struct socket *sock;
1070
1071 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001072 * We can't return errors to poll, so it's either yes or no.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 */
Eric Dumazetb69aee02005-09-06 14:42:45 -07001074 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 return sock->ops->poll(file, sock, wait);
1076}
1077
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001078static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001080 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081
1082 return sock->ops->mmap(file, sock, vma);
1083}
1084
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001085static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086{
1087 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001088 * It was possible the inode is NULL we were
1089 * closing an unfinished socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 */
1091
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001092 if (!inode) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 printk(KERN_DEBUG "sock_close: NULL inode\n");
1094 return 0;
1095 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 sock_release(SOCKET_I(inode));
1097 return 0;
1098}
1099
1100/*
1101 * Update the socket async list
1102 *
1103 * Fasync_list locking strategy.
1104 *
1105 * 1. fasync_list is modified only under process context socket lock
1106 * i.e. under semaphore.
1107 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001108 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 */
1110
1111static int sock_fasync(int fd, struct file *filp, int on)
1112{
Eric Dumazet989a2972010-04-14 09:55:35 +00001113 struct socket *sock = filp->private_data;
1114 struct sock *sk = sock->sk;
Eric Dumazeteaefd112011-02-18 03:26:36 +00001115 struct socket_wq *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116
Eric Dumazet989a2972010-04-14 09:55:35 +00001117 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119
1120 lock_sock(sk);
Eric Dumazeteaefd112011-02-18 03:26:36 +00001121 wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
1122 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123
Eric Dumazeteaefd112011-02-18 03:26:36 +00001124 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001125 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001126 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001127 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128
Eric Dumazet989a2972010-04-14 09:55:35 +00001129 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 return 0;
1131}
1132
Eric Dumazet43815482010-04-29 11:01:49 +00001133/* This function may be called only under socket lock or callback_lock or rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134
1135int sock_wake_async(struct socket *sock, int how, int band)
1136{
Eric Dumazet43815482010-04-29 11:01:49 +00001137 struct socket_wq *wq;
1138
1139 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001141 rcu_read_lock();
1142 wq = rcu_dereference(sock->wq);
1143 if (!wq || !wq->fasync_list) {
1144 rcu_read_unlock();
1145 return -1;
1146 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001147 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001148 case SOCK_WAKE_WAITD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1150 break;
1151 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001152 case SOCK_WAKE_SPACE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1154 break;
1155 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001156 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001157call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001158 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001160 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001161 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 }
Eric Dumazet43815482010-04-29 11:01:49 +00001163 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 return 0;
1165}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001166EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
Pavel Emelyanov721db932010-09-29 16:06:32 +04001168int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001169 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170{
1171 int err;
1172 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001173 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174
1175 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001176 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 */
1178 if (family < 0 || family >= NPROTO)
1179 return -EAFNOSUPPORT;
1180 if (type < 0 || type >= SOCK_MAX)
1181 return -EINVAL;
1182
1183 /* Compatibility.
1184
1185 This uglymoron is moved from INET layer to here to avoid
1186 deadlock in module load.
1187 */
1188 if (family == PF_INET && type == SOCK_PACKET) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001189 static int warned;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 if (!warned) {
1191 warned = 1;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001192 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1193 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 }
1195 family = PF_PACKET;
1196 }
1197
1198 err = security_socket_create(family, type, protocol, kern);
1199 if (err)
1200 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001201
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001202 /*
1203 * Allocate the socket and allow the family to set things up. if
1204 * the protocol is 0, the family is instructed to select an appropriate
1205 * default.
1206 */
1207 sock = sock_alloc();
1208 if (!sock) {
1209 if (net_ratelimit())
1210 printk(KERN_WARNING "socket: no more sockets\n");
1211 return -ENFILE; /* Not exactly a match, but its the
1212 closest posix thing */
1213 }
1214
1215 sock->type = type;
1216
Johannes Berg95a5afc2008-10-16 15:24:51 -07001217#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001218 /* Attempt to load a protocol module if the find failed.
1219 *
1220 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 * requested real, full-featured networking support upon configuration.
1222 * Otherwise module support will break!
1223 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001224 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001225 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226#endif
1227
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001228 rcu_read_lock();
1229 pf = rcu_dereference(net_families[family]);
1230 err = -EAFNOSUPPORT;
1231 if (!pf)
1232 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233
1234 /*
1235 * We will call the ->create function, that possibly is in a loadable
1236 * module, so we have to bump that loadable module refcnt first.
1237 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001238 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 goto out_release;
1240
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001241 /* Now protected by module ref count */
1242 rcu_read_unlock();
1243
Eric Paris3f378b62009-11-05 22:18:14 -08001244 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001245 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001247
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 /*
1249 * Now to bump the refcnt of the [loadable] module that owns this
1250 * socket at sock_release time we decrement its refcnt.
1251 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001252 if (!try_module_get(sock->ops->owner))
1253 goto out_module_busy;
1254
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 /*
1256 * Now that we're done with the ->create function, the [loadable]
1257 * module can have its refcnt decremented
1258 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001259 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001260 err = security_socket_post_create(sock, family, type, protocol, kern);
1261 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001262 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001263 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001265 return 0;
1266
1267out_module_busy:
1268 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001270 sock->ops = NULL;
1271 module_put(pf->owner);
1272out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001274 return err;
1275
1276out_release:
1277 rcu_read_unlock();
1278 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001280EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281
1282int sock_create(int family, int type, int protocol, struct socket **res)
1283{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001284 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001286EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287
1288int sock_create_kern(int family, int type, int protocol, struct socket **res)
1289{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001290 return __sock_create(&init_net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001292EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001294SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295{
1296 int retval;
1297 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001298 int flags;
1299
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001300 /* Check the SOCK_* constants for consistency. */
1301 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1302 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1303 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1304 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1305
Ulrich Dreppera677a032008-07-23 21:29:17 -07001306 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001307 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001308 return -EINVAL;
1309 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001311 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1312 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1313
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 retval = sock_create(family, type, protocol, &sock);
1315 if (retval < 0)
1316 goto out;
1317
Ulrich Drepper77d27202008-07-23 21:29:35 -07001318 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 if (retval < 0)
1320 goto out_release;
1321
1322out:
1323 /* It may be already another descriptor 8) Not kernel problem. */
1324 return retval;
1325
1326out_release:
1327 sock_release(sock);
1328 return retval;
1329}
1330
1331/*
1332 * Create a pair of connected sockets.
1333 */
1334
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001335SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1336 int __user *, usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337{
1338 struct socket *sock1, *sock2;
1339 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001340 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001341 int flags;
1342
1343 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001344 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001345 return -EINVAL;
1346 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001348 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1349 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1350
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 /*
1352 * Obtain the first socket and check if the underlying protocol
1353 * supports the socketpair call.
1354 */
1355
1356 err = sock_create(family, type, protocol, &sock1);
1357 if (err < 0)
1358 goto out;
1359
1360 err = sock_create(family, type, protocol, &sock2);
1361 if (err < 0)
1362 goto out_release_1;
1363
1364 err = sock1->ops->socketpair(sock1, sock2);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001365 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 goto out_release_both;
1367
Al Viro7cbe66b2009-08-05 19:59:08 +04001368 fd1 = sock_alloc_file(sock1, &newfile1, flags);
David S. Millerbf3c23d2007-10-29 21:54:02 -07001369 if (unlikely(fd1 < 0)) {
1370 err = fd1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 goto out_release_both;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001372 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373
Al Viro7cbe66b2009-08-05 19:59:08 +04001374 fd2 = sock_alloc_file(sock2, &newfile2, flags);
Al Viro198de4d2009-08-05 19:29:23 +04001375 if (unlikely(fd2 < 0)) {
1376 err = fd2;
1377 fput(newfile1);
1378 put_unused_fd(fd1);
1379 sock_release(sock2);
1380 goto out;
Al Virodb349502007-02-07 01:48:00 -05001381 }
1382
Al Viro157cf642008-12-14 04:57:47 -05001383 audit_fd_pair(fd1, fd2);
Al Virodb349502007-02-07 01:48:00 -05001384 fd_install(fd1, newfile1);
1385 fd_install(fd2, newfile2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 /* fd1 and fd2 may be already another descriptors.
1387 * Not kernel problem.
1388 */
1389
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001390 err = put_user(fd1, &usockvec[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 if (!err)
1392 err = put_user(fd2, &usockvec[1]);
1393 if (!err)
1394 return 0;
1395
1396 sys_close(fd2);
1397 sys_close(fd1);
1398 return err;
1399
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400out_release_both:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001401 sock_release(sock2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402out_release_1:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001403 sock_release(sock1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404out:
1405 return err;
1406}
1407
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408/*
1409 * Bind a name to a socket. Nothing much to do here since it's
1410 * the protocol's responsibility to handle the local address.
1411 *
1412 * We move the socket address to kernel space before we call
1413 * the protocol layer (having also checked the address is ok).
1414 */
1415
Heiko Carstens20f37032009-01-14 14:14:23 +01001416SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417{
1418 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001419 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001420 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001422 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001423 if (sock) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001424 err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001425 if (err >= 0) {
1426 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001427 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001428 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001429 if (!err)
1430 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001431 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001432 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001434 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001435 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 return err;
1437}
1438
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439/*
1440 * Perform a listen. Basically, we allow the protocol to do anything
1441 * necessary for a listen, and if that works, we mark the socket as
1442 * ready for listening.
1443 */
1444
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001445SYSCALL_DEFINE2(listen, int, fd, int, backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446{
1447 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001448 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001449 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001450
1451 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1452 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001453 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001454 if ((unsigned)backlog > somaxconn)
1455 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456
1457 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001458 if (!err)
1459 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001461 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 }
1463 return err;
1464}
1465
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466/*
1467 * For accept, we attempt to create a new socket, set up the link
1468 * with the client, wake up the client, then return the new
1469 * connected fd. We collect the address of the connector in kernel
1470 * space and move it to user at the very end. This is unclean because
1471 * we open the socket then return an error.
1472 *
1473 * 1003.1g adds the ability to recvmsg() to query connection pending
1474 * status to recvmsg. We need to add that support in a way thats
1475 * clean when we restucture accept also.
1476 */
1477
Heiko Carstens20f37032009-01-14 14:14:23 +01001478SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1479 int __user *, upeer_addrlen, int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480{
1481 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001482 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001483 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001484 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485
Ulrich Drepper77d27202008-07-23 21:29:35 -07001486 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001487 return -EINVAL;
1488
1489 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1490 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1491
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001492 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 if (!sock)
1494 goto out;
1495
1496 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001497 newsock = sock_alloc();
1498 if (!newsock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499 goto out_put;
1500
1501 newsock->type = sock->type;
1502 newsock->ops = sock->ops;
1503
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 /*
1505 * We don't need try_module_get here, as the listening socket (sock)
1506 * has the protocol module (sock->ops->owner) held.
1507 */
1508 __module_get(newsock->ops->owner);
1509
Al Viro7cbe66b2009-08-05 19:59:08 +04001510 newfd = sock_alloc_file(newsock, &newfile, flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001511 if (unlikely(newfd < 0)) {
1512 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001513 sock_release(newsock);
1514 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001515 }
1516
Frank Filza79af592005-09-27 15:23:38 -07001517 err = security_socket_accept(sock, newsock);
1518 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001519 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001520
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1522 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001523 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524
1525 if (upeer_sockaddr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001526 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001527 &len, 2) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001529 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 }
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001531 err = move_addr_to_user((struct sockaddr *)&address,
1532 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001534 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535 }
1536
1537 /* File flags are not inherited via accept() unlike another OSes. */
1538
David S. Miller39d8c1b2006-03-20 17:13:49 -08001539 fd_install(newfd, newfile);
1540 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001543 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544out:
1545 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001546out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001547 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001548 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 goto out_put;
1550}
1551
Heiko Carstens20f37032009-01-14 14:14:23 +01001552SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1553 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001554{
Ulrich Drepperde11def2008-11-19 15:36:14 -08001555 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001556}
1557
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558/*
1559 * Attempt to connect to a socket with the server address. The address
1560 * is in user space so we verify it is OK and move it to kernel space.
1561 *
1562 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1563 * break bindings
1564 *
1565 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1566 * other SEQPACKET protocols that take time to connect() as it doesn't
1567 * include the -EINPROGRESS status for such sockets.
1568 */
1569
Heiko Carstens20f37032009-01-14 14:14:23 +01001570SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1571 int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572{
1573 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001574 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001575 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001577 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 if (!sock)
1579 goto out;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001580 err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 if (err < 0)
1582 goto out_put;
1583
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001584 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001585 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 if (err)
1587 goto out_put;
1588
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001589 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590 sock->file->f_flags);
1591out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001592 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593out:
1594 return err;
1595}
1596
1597/*
1598 * Get the local address ('name') of a socket object. Move the obtained
1599 * name to user space.
1600 */
1601
Heiko Carstens20f37032009-01-14 14:14:23 +01001602SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1603 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604{
1605 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001606 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001607 int len, err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001608
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001609 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 if (!sock)
1611 goto out;
1612
1613 err = security_socket_getsockname(sock);
1614 if (err)
1615 goto out_put;
1616
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001617 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618 if (err)
1619 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001620 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621
1622out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001623 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624out:
1625 return err;
1626}
1627
1628/*
1629 * Get the remote address ('name') of a socket object. Move the obtained
1630 * name to user space.
1631 */
1632
Heiko Carstens20f37032009-01-14 14:14:23 +01001633SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1634 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635{
1636 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001637 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001638 int len, err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001640 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1641 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642 err = security_socket_getpeername(sock);
1643 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001644 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645 return err;
1646 }
1647
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001648 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001649 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001650 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651 if (!err)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001652 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001653 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001654 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 }
1656 return err;
1657}
1658
1659/*
1660 * Send a datagram to a given address. We move the address into kernel
1661 * space and check the user space data area is readable before invoking
1662 * the protocol.
1663 */
1664
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001665SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1666 unsigned, flags, struct sockaddr __user *, addr,
1667 int, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668{
1669 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001670 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 int err;
1672 struct msghdr msg;
1673 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001674 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001675
Linus Torvalds253eacc2010-10-30 16:43:10 -07001676 if (len > INT_MAX)
1677 len = INT_MAX;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001678 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1679 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001680 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001681
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001682 iov.iov_base = buff;
1683 iov.iov_len = len;
1684 msg.msg_name = NULL;
1685 msg.msg_iov = &iov;
1686 msg.msg_iovlen = 1;
1687 msg.msg_control = NULL;
1688 msg.msg_controllen = 0;
1689 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001690 if (addr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001691 err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692 if (err < 0)
1693 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001694 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001695 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 }
1697 if (sock->file->f_flags & O_NONBLOCK)
1698 flags |= MSG_DONTWAIT;
1699 msg.msg_flags = flags;
1700 err = sock_sendmsg(sock, &msg, len);
1701
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001702out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001703 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001704out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705 return err;
1706}
1707
1708/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001709 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710 */
1711
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001712SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1713 unsigned, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714{
1715 return sys_sendto(fd, buff, len, flags, NULL, 0);
1716}
1717
1718/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001719 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 * sender. We verify the buffers are writable and if needed move the
1721 * sender address from kernel to user space.
1722 */
1723
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001724SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1725 unsigned, flags, struct sockaddr __user *, addr,
1726 int __user *, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727{
1728 struct socket *sock;
1729 struct iovec iov;
1730 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001731 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001732 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001733 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734
Linus Torvalds253eacc2010-10-30 16:43:10 -07001735 if (size > INT_MAX)
1736 size = INT_MAX;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001737 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001739 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001741 msg.msg_control = NULL;
1742 msg.msg_controllen = 0;
1743 msg.msg_iovlen = 1;
1744 msg.msg_iov = &iov;
1745 iov.iov_len = size;
1746 iov.iov_base = ubuf;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001747 msg.msg_name = (struct sockaddr *)&address;
1748 msg.msg_namelen = sizeof(address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 if (sock->file->f_flags & O_NONBLOCK)
1750 flags |= MSG_DONTWAIT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001751 err = sock_recvmsg(sock, &msg, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001753 if (err >= 0 && addr != NULL) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001754 err2 = move_addr_to_user((struct sockaddr *)&address,
1755 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001756 if (err2 < 0)
1757 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001759
1760 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001761out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762 return err;
1763}
1764
1765/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001766 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767 */
1768
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001769asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1770 unsigned flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771{
1772 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1773}
1774
1775/*
1776 * Set a socket option. Because we don't know the option lengths we have
1777 * to pass the user mode parameter for the protocols to sort out.
1778 */
1779
Heiko Carstens20f37032009-01-14 14:14:23 +01001780SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1781 char __user *, optval, int, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001783 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784 struct socket *sock;
1785
1786 if (optlen < 0)
1787 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001788
1789 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1790 if (sock != NULL) {
1791 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001792 if (err)
1793 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794
1795 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001796 err =
1797 sock_setsockopt(sock, level, optname, optval,
1798 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001800 err =
1801 sock->ops->setsockopt(sock, level, optname, optval,
1802 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001803out_put:
1804 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 }
1806 return err;
1807}
1808
1809/*
1810 * Get a socket option. Because we don't know the option lengths we have
1811 * to pass a user mode parameter for the protocols to sort out.
1812 */
1813
Heiko Carstens20f37032009-01-14 14:14:23 +01001814SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1815 char __user *, optval, int __user *, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001817 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818 struct socket *sock;
1819
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001820 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1821 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001822 err = security_socket_getsockopt(sock, level, optname);
1823 if (err)
1824 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825
1826 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001827 err =
1828 sock_getsockopt(sock, level, optname, optval,
1829 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001831 err =
1832 sock->ops->getsockopt(sock, level, optname, optval,
1833 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001834out_put:
1835 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836 }
1837 return err;
1838}
1839
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840/*
1841 * Shutdown a socket.
1842 */
1843
Heiko Carstens754fe8d2009-01-14 14:14:09 +01001844SYSCALL_DEFINE2(shutdown, int, fd, int, how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001845{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001846 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 struct socket *sock;
1848
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001849 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1850 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001852 if (!err)
1853 err = sock->ops->shutdown(sock, how);
1854 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855 }
1856 return err;
1857}
1858
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001859/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 * fields which are the same type (int / unsigned) on our platforms.
1861 */
1862#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1863#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1864#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1865
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866/*
1867 * BSD sendmsg interface
1868 */
1869
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001870SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001872 struct compat_msghdr __user *msg_compat =
1873 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001875 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07001877 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001878 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1879 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880 unsigned char *ctl_buf = ctl;
1881 struct msghdr msg_sys;
1882 int err, ctl_len, iov_size, total_len;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001883 int fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001884
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885 err = -EFAULT;
1886 if (MSG_CMSG_COMPAT & flags) {
1887 if (get_compat_msghdr(&msg_sys, msg_compat))
1888 return -EFAULT;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001889 } else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 return -EFAULT;
1891
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001892 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001893 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 goto out;
1895
1896 /* do not move before msg_sys is valid */
1897 err = -EMSGSIZE;
1898 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1899 goto out_put;
1900
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001901 /* Check whether to allocate the iovec area */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902 err = -ENOMEM;
1903 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1904 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1905 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1906 if (!iov)
1907 goto out_put;
1908 }
1909
1910 /* This will also move the address data into kernel space */
1911 if (MSG_CMSG_COMPAT & flags) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001912 err = verify_compat_iovec(&msg_sys, iov,
1913 (struct sockaddr *)&address,
1914 VERIFY_READ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 } else
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001916 err = verify_iovec(&msg_sys, iov,
1917 (struct sockaddr *)&address,
1918 VERIFY_READ);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001919 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920 goto out_freeiov;
1921 total_len = err;
1922
1923 err = -ENOBUFS;
1924
1925 if (msg_sys.msg_controllen > INT_MAX)
1926 goto out_freeiov;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001927 ctl_len = msg_sys.msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001929 err =
1930 cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl,
1931 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 if (err)
1933 goto out_freeiov;
1934 ctl_buf = msg_sys.msg_control;
Al Viro8920e8f2005-09-07 18:28:51 -07001935 ctl_len = msg_sys.msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 } else if (ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001937 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001939 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940 goto out_freeiov;
1941 }
1942 err = -EFAULT;
1943 /*
1944 * Careful! Before this, msg_sys.msg_control contains a user pointer.
1945 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1946 * checking falls down on this.
1947 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00001948 if (copy_from_user(ctl_buf,
1949 (void __user __force *)msg_sys.msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001950 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951 goto out_freectl;
1952 msg_sys.msg_control = ctl_buf;
1953 }
1954 msg_sys.msg_flags = flags;
1955
1956 if (sock->file->f_flags & O_NONBLOCK)
1957 msg_sys.msg_flags |= MSG_DONTWAIT;
1958 err = sock_sendmsg(sock, &msg_sys, total_len);
1959
1960out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001961 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1963out_freeiov:
1964 if (iov != iovstack)
1965 sock_kfree_s(sock->sk, iov, iov_size);
1966out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001967 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001968out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969 return err;
1970}
1971
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07001972static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
1973 struct msghdr *msg_sys, unsigned flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001975 struct compat_msghdr __user *msg_compat =
1976 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001978 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979 unsigned long cmsg_ptr;
1980 int err, iov_size, total_len, len;
1981
1982 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001983 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984
1985 /* user mode address pointers */
1986 struct sockaddr __user *uaddr;
1987 int __user *uaddr_len;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001988
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989 if (MSG_CMSG_COMPAT & flags) {
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07001990 if (get_compat_msghdr(msg_sys, msg_compat))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991 return -EFAULT;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001992 } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001993 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995 err = -EMSGSIZE;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07001996 if (msg_sys->msg_iovlen > UIO_MAXIOV)
1997 goto out;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001998
1999 /* Check whether to allocate the iovec area */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000 err = -ENOMEM;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002001 iov_size = msg_sys->msg_iovlen * sizeof(struct iovec);
2002 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
2004 if (!iov)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002005 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006 }
2007
2008 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002009 * Save the user-mode address (verify_iovec will change the
2010 * kernel msghdr to use the kernel address space)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002012
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002013 uaddr = (__force void __user *)msg_sys->msg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014 uaddr_len = COMPAT_NAMELEN(msg);
2015 if (MSG_CMSG_COMPAT & flags) {
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002016 err = verify_compat_iovec(msg_sys, iov,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002017 (struct sockaddr *)&addr,
2018 VERIFY_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002019 } else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002020 err = verify_iovec(msg_sys, iov,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002021 (struct sockaddr *)&addr,
2022 VERIFY_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023 if (err < 0)
2024 goto out_freeiov;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002025 total_len = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002027 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2028 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002029
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030 if (sock->file->f_flags & O_NONBLOCK)
2031 flags |= MSG_DONTWAIT;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002032 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
2033 total_len, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034 if (err < 0)
2035 goto out_freeiov;
2036 len = err;
2037
2038 if (uaddr != NULL) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002039 err = move_addr_to_user((struct sockaddr *)&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002040 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002041 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042 if (err < 0)
2043 goto out_freeiov;
2044 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002045 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002046 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002047 if (err)
2048 goto out_freeiov;
2049 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002050 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 &msg_compat->msg_controllen);
2052 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002053 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002054 &msg->msg_controllen);
2055 if (err)
2056 goto out_freeiov;
2057 err = len;
2058
2059out_freeiov:
2060 if (iov != iovstack)
2061 sock_kfree_s(sock->sk, iov, iov_size);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002062out:
2063 return err;
2064}
2065
2066/*
2067 * BSD recvmsg interface
2068 */
2069
2070SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
2071 unsigned int, flags)
2072{
2073 int fput_needed, err;
2074 struct msghdr msg_sys;
2075 struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
2076
2077 if (!sock)
2078 goto out;
2079
2080 err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2081
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002082 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083out:
2084 return err;
2085}
2086
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002087/*
2088 * Linux recvmmsg interface
2089 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002091int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2092 unsigned int flags, struct timespec *timeout)
2093{
2094 int fput_needed, err, datagrams;
2095 struct socket *sock;
2096 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002097 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002098 struct msghdr msg_sys;
2099 struct timespec end_time;
2100
2101 if (timeout &&
2102 poll_select_set_timeout(&end_time, timeout->tv_sec,
2103 timeout->tv_nsec))
2104 return -EINVAL;
2105
2106 datagrams = 0;
2107
2108 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2109 if (!sock)
2110 return err;
2111
2112 err = sock_error(sock->sk);
2113 if (err)
2114 goto out_put;
2115
2116 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002117 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002118
2119 while (datagrams < vlen) {
2120 /*
2121 * No need to ask LSM for more than the first datagram.
2122 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002123 if (MSG_CMSG_COMPAT & flags) {
2124 err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
2125 &msg_sys, flags, datagrams);
2126 if (err < 0)
2127 break;
2128 err = __put_user(err, &compat_entry->msg_len);
2129 ++compat_entry;
2130 } else {
2131 err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
2132 &msg_sys, flags, datagrams);
2133 if (err < 0)
2134 break;
2135 err = put_user(err, &entry->msg_len);
2136 ++entry;
2137 }
2138
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002139 if (err)
2140 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002141 ++datagrams;
2142
Brandon L Black71c5c152010-03-26 16:18:03 +00002143 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2144 if (flags & MSG_WAITFORONE)
2145 flags |= MSG_DONTWAIT;
2146
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002147 if (timeout) {
2148 ktime_get_ts(timeout);
2149 *timeout = timespec_sub(end_time, *timeout);
2150 if (timeout->tv_sec < 0) {
2151 timeout->tv_sec = timeout->tv_nsec = 0;
2152 break;
2153 }
2154
2155 /* Timeout, return less than vlen datagrams */
2156 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2157 break;
2158 }
2159
2160 /* Out of band data, return right away */
2161 if (msg_sys.msg_flags & MSG_OOB)
2162 break;
2163 }
2164
2165out_put:
2166 fput_light(sock->file, fput_needed);
2167
2168 if (err == 0)
2169 return datagrams;
2170
2171 if (datagrams != 0) {
2172 /*
2173 * We may return less entries than requested (vlen) if the
2174 * sock is non block and there aren't enough datagrams...
2175 */
2176 if (err != -EAGAIN) {
2177 /*
2178 * ... or if recvmsg returns an error after we
2179 * received some datagrams, where we record the
2180 * error to return on the next call or if the
2181 * app asks about it using getsockopt(SO_ERROR).
2182 */
2183 sock->sk->sk_err = -err;
2184 }
2185
2186 return datagrams;
2187 }
2188
2189 return err;
2190}
2191
2192SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2193 unsigned int, vlen, unsigned int, flags,
2194 struct timespec __user *, timeout)
2195{
2196 int datagrams;
2197 struct timespec timeout_sys;
2198
2199 if (!timeout)
2200 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2201
2202 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2203 return -EFAULT;
2204
2205 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2206
2207 if (datagrams > 0 &&
2208 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2209 datagrams = -EFAULT;
2210
2211 return datagrams;
2212}
2213
2214#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002215/* Argument list sizes for sys_socketcall */
2216#define AL(x) ((x) * sizeof(unsigned long))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002217static const unsigned char nargs[20] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002218 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2219 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2220 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2221 AL(4), AL(5)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002222};
2223
Linus Torvalds1da177e2005-04-16 15:20:36 -07002224#undef AL
2225
2226/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002227 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228 *
2229 * Argument checking cleaned up. Saved 20% in size.
2230 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002231 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002232 */
2233
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002234SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002235{
2236 unsigned long a[6];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002237 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002238 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002239 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002241 if (call < 1 || call > SYS_RECVMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242 return -EINVAL;
2243
Arjan van de Ven47379052009-09-28 12:57:44 -07002244 len = nargs[call];
2245 if (len > sizeof(a))
2246 return -EINVAL;
2247
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002249 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002251
Al Virof3298dc2008-12-10 03:16:51 -05002252 audit_socketcall(nargs[call] / sizeof(unsigned long), a);
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002253
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002254 a0 = a[0];
2255 a1 = a[1];
2256
2257 switch (call) {
2258 case SYS_SOCKET:
2259 err = sys_socket(a0, a1, a[2]);
2260 break;
2261 case SYS_BIND:
2262 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2263 break;
2264 case SYS_CONNECT:
2265 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2266 break;
2267 case SYS_LISTEN:
2268 err = sys_listen(a0, a1);
2269 break;
2270 case SYS_ACCEPT:
Ulrich Drepperde11def2008-11-19 15:36:14 -08002271 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2272 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002273 break;
2274 case SYS_GETSOCKNAME:
2275 err =
2276 sys_getsockname(a0, (struct sockaddr __user *)a1,
2277 (int __user *)a[2]);
2278 break;
2279 case SYS_GETPEERNAME:
2280 err =
2281 sys_getpeername(a0, (struct sockaddr __user *)a1,
2282 (int __user *)a[2]);
2283 break;
2284 case SYS_SOCKETPAIR:
2285 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2286 break;
2287 case SYS_SEND:
2288 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2289 break;
2290 case SYS_SENDTO:
2291 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2292 (struct sockaddr __user *)a[4], a[5]);
2293 break;
2294 case SYS_RECV:
2295 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2296 break;
2297 case SYS_RECVFROM:
2298 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2299 (struct sockaddr __user *)a[4],
2300 (int __user *)a[5]);
2301 break;
2302 case SYS_SHUTDOWN:
2303 err = sys_shutdown(a0, a1);
2304 break;
2305 case SYS_SETSOCKOPT:
2306 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2307 break;
2308 case SYS_GETSOCKOPT:
2309 err =
2310 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2311 (int __user *)a[4]);
2312 break;
2313 case SYS_SENDMSG:
2314 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2315 break;
2316 case SYS_RECVMSG:
2317 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2318 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002319 case SYS_RECVMMSG:
2320 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2321 (struct timespec __user *)a[4]);
2322 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002323 case SYS_ACCEPT4:
2324 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2325 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002326 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002327 default:
2328 err = -EINVAL;
2329 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002330 }
2331 return err;
2332}
2333
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002334#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002335
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002336/**
2337 * sock_register - add a socket protocol handler
2338 * @ops: description of protocol
2339 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340 * This function is called by a protocol handler that wants to
2341 * advertise its address family, and have it linked into the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002342 * socket interface. The value ops->family coresponds to the
2343 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002344 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002345int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002346{
2347 int err;
2348
2349 if (ops->family >= NPROTO) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002350 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
2351 NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352 return -ENOBUFS;
2353 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002354
2355 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002356 if (rcu_dereference_protected(net_families[ops->family],
2357 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002358 err = -EEXIST;
2359 else {
Eric Dumazet190683a2010-11-10 10:50:44 +00002360 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002361 err = 0;
2362 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002363 spin_unlock(&net_family_lock);
2364
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002365 printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002366 return err;
2367}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002368EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002369
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002370/**
2371 * sock_unregister - remove a protocol handler
2372 * @family: protocol family to remove
2373 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002374 * This function is called by a protocol handler that wants to
2375 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002376 * new socket creation.
2377 *
2378 * If protocol handler is a module, then it can use module reference
2379 * counts to protect against new references. If protocol handler is not
2380 * a module then it needs to provide its own protection in
2381 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002382 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002383void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002384{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002385 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002386
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002387 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002388 rcu_assign_pointer(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002389 spin_unlock(&net_family_lock);
2390
2391 synchronize_rcu();
2392
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002393 printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002394}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002395EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002396
Andi Kleen77d76ea2005-12-22 12:43:42 -08002397static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002398{
Nick Pigginb3e19d92011-01-07 17:50:11 +11002399 int err;
2400
Linus Torvalds1da177e2005-04-16 15:20:36 -07002401 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002402 * Initialize sock SLAB cache.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002403 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002404
Linus Torvalds1da177e2005-04-16 15:20:36 -07002405 sk_init();
2406
Linus Torvalds1da177e2005-04-16 15:20:36 -07002407 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002408 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002409 */
2410 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002411
2412 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002413 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002414 */
2415
2416 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11002417
2418 err = register_filesystem(&sock_fs_type);
2419 if (err)
2420 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002421 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11002422 if (IS_ERR(sock_mnt)) {
2423 err = PTR_ERR(sock_mnt);
2424 goto out_mount;
2425 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08002426
2427 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002428 */
2429
2430#ifdef CONFIG_NETFILTER
2431 netfilter_init();
2432#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002433
Richard Cochranc1f19b52010-07-17 08:49:36 +00002434#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
2435 skb_timestamping_init();
2436#endif
2437
Nick Pigginb3e19d92011-01-07 17:50:11 +11002438out:
2439 return err;
2440
2441out_mount:
2442 unregister_filesystem(&sock_fs_type);
2443out_fs:
2444 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002445}
2446
Andi Kleen77d76ea2005-12-22 12:43:42 -08002447core_initcall(sock_init); /* early initcall */
2448
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449#ifdef CONFIG_PROC_FS
2450void socket_seq_show(struct seq_file *seq)
2451{
2452 int cpu;
2453 int counter = 0;
2454
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07002455 for_each_possible_cpu(cpu)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002456 counter += per_cpu(sockets_in_use, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002457
2458 /* It can be negative, by the way. 8) */
2459 if (counter < 0)
2460 counter = 0;
2461
2462 seq_printf(seq, "sockets: used %d\n", counter);
2463}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002464#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002465
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002466#ifdef CONFIG_COMPAT
Arnd Bergmann6b960182009-11-06 23:10:54 -08002467static int do_siocgstamp(struct net *net, struct socket *sock,
2468 unsigned int cmd, struct compat_timeval __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002469{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002470 mm_segment_t old_fs = get_fs();
2471 struct timeval ktv;
2472 int err;
2473
2474 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002475 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002476 set_fs(old_fs);
2477 if (!err) {
2478 err = put_user(ktv.tv_sec, &up->tv_sec);
2479 err |= __put_user(ktv.tv_usec, &up->tv_usec);
2480 }
2481 return err;
2482}
2483
Arnd Bergmann6b960182009-11-06 23:10:54 -08002484static int do_siocgstampns(struct net *net, struct socket *sock,
2485 unsigned int cmd, struct compat_timespec __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002486{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002487 mm_segment_t old_fs = get_fs();
2488 struct timespec kts;
2489 int err;
2490
2491 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002492 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002493 set_fs(old_fs);
2494 if (!err) {
2495 err = put_user(kts.tv_sec, &up->tv_sec);
2496 err |= __put_user(kts.tv_nsec, &up->tv_nsec);
2497 }
2498 return err;
2499}
2500
Arnd Bergmann6b960182009-11-06 23:10:54 -08002501static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002502{
2503 struct ifreq __user *uifr;
2504 int err;
2505
2506 uifr = compat_alloc_user_space(sizeof(struct ifreq));
Arnd Bergmann6b960182009-11-06 23:10:54 -08002507 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002508 return -EFAULT;
2509
Arnd Bergmann6b960182009-11-06 23:10:54 -08002510 err = dev_ioctl(net, SIOCGIFNAME, uifr);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002511 if (err)
2512 return err;
2513
Arnd Bergmann6b960182009-11-06 23:10:54 -08002514 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002515 return -EFAULT;
2516
2517 return 0;
2518}
2519
Arnd Bergmann6b960182009-11-06 23:10:54 -08002520static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002521{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002522 struct compat_ifconf ifc32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002523 struct ifconf ifc;
2524 struct ifconf __user *uifc;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002525 struct compat_ifreq __user *ifr32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002526 struct ifreq __user *ifr;
2527 unsigned int i, j;
2528 int err;
2529
Arnd Bergmann6b960182009-11-06 23:10:54 -08002530 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002531 return -EFAULT;
2532
2533 if (ifc32.ifcbuf == 0) {
2534 ifc32.ifc_len = 0;
2535 ifc.ifc_len = 0;
2536 ifc.ifc_req = NULL;
2537 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2538 } else {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002539 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2540 sizeof(struct ifreq);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002541 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2542 ifc.ifc_len = len;
2543 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2544 ifr32 = compat_ptr(ifc32.ifcbuf);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002545 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
Arnd Bergmann6b960182009-11-06 23:10:54 -08002546 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002547 return -EFAULT;
2548 ifr++;
2549 ifr32++;
2550 }
2551 }
2552 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2553 return -EFAULT;
2554
Arnd Bergmann6b960182009-11-06 23:10:54 -08002555 err = dev_ioctl(net, SIOCGIFCONF, uifc);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002556 if (err)
2557 return err;
2558
2559 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2560 return -EFAULT;
2561
2562 ifr = ifc.ifc_req;
2563 ifr32 = compat_ptr(ifc32.ifcbuf);
2564 for (i = 0, j = 0;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002565 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2566 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2567 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002568 return -EFAULT;
2569 ifr32++;
2570 ifr++;
2571 }
2572
2573 if (ifc32.ifcbuf == 0) {
2574 /* Translate from 64-bit structure multiple to
2575 * a 32-bit one.
2576 */
2577 i = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002578 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
Arnd Bergmann7a229382009-11-06 23:00:29 -08002579 ifc32.ifc_len = i;
2580 } else {
2581 ifc32.ifc_len = i;
2582 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08002583 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002584 return -EFAULT;
2585
2586 return 0;
2587}
2588
Arnd Bergmann6b960182009-11-06 23:10:54 -08002589static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002590{
Ben Hutchings3a7da392011-03-17 07:34:32 +00002591 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2592 bool convert_in = false, convert_out = false;
2593 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2594 struct ethtool_rxnfc __user *rxnfc;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002595 struct ifreq __user *ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002596 u32 rule_cnt = 0, actual_rule_cnt;
2597 u32 ethcmd;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002598 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002599 int ret;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002600
2601 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2602 return -EFAULT;
2603
Ben Hutchings3a7da392011-03-17 07:34:32 +00002604 compat_rxnfc = compat_ptr(data);
2605
2606 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002607 return -EFAULT;
2608
Ben Hutchings3a7da392011-03-17 07:34:32 +00002609 /* Most ethtool structures are defined without padding.
2610 * Unfortunately struct ethtool_rxnfc is an exception.
2611 */
2612 switch (ethcmd) {
2613 default:
2614 break;
2615 case ETHTOOL_GRXCLSRLALL:
2616 /* Buffer size is variable */
2617 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2618 return -EFAULT;
2619 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2620 return -ENOMEM;
2621 buf_size += rule_cnt * sizeof(u32);
2622 /* fall through */
2623 case ETHTOOL_GRXRINGS:
2624 case ETHTOOL_GRXCLSRLCNT:
2625 case ETHTOOL_GRXCLSRULE:
2626 convert_out = true;
2627 /* fall through */
2628 case ETHTOOL_SRXCLSRLDEL:
2629 case ETHTOOL_SRXCLSRLINS:
2630 buf_size += sizeof(struct ethtool_rxnfc);
2631 convert_in = true;
2632 break;
2633 }
2634
2635 ifr = compat_alloc_user_space(buf_size);
2636 rxnfc = (void *)ifr + ALIGN(sizeof(struct ifreq), 8);
2637
2638 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2639 return -EFAULT;
2640
2641 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2642 &ifr->ifr_ifru.ifru_data))
2643 return -EFAULT;
2644
2645 if (convert_in) {
2646 /* We expect there to be holes between fs.m_u and
2647 * fs.ring_cookie and at the end of fs, but nowhere else.
2648 */
2649 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_u) +
2650 sizeof(compat_rxnfc->fs.m_u) !=
2651 offsetof(struct ethtool_rxnfc, fs.m_u) +
2652 sizeof(rxnfc->fs.m_u));
2653 BUILD_BUG_ON(
2654 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2655 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2656 offsetof(struct ethtool_rxnfc, fs.location) -
2657 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2658
2659 if (copy_in_user(rxnfc, compat_rxnfc,
2660 (void *)(&rxnfc->fs.m_u + 1) -
2661 (void *)rxnfc) ||
2662 copy_in_user(&rxnfc->fs.ring_cookie,
2663 &compat_rxnfc->fs.ring_cookie,
2664 (void *)(&rxnfc->fs.location + 1) -
2665 (void *)&rxnfc->fs.ring_cookie) ||
2666 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2667 sizeof(rxnfc->rule_cnt)))
2668 return -EFAULT;
2669 }
2670
2671 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2672 if (ret)
2673 return ret;
2674
2675 if (convert_out) {
2676 if (copy_in_user(compat_rxnfc, rxnfc,
2677 (const void *)(&rxnfc->fs.m_u + 1) -
2678 (const void *)rxnfc) ||
2679 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2680 &rxnfc->fs.ring_cookie,
2681 (const void *)(&rxnfc->fs.location + 1) -
2682 (const void *)&rxnfc->fs.ring_cookie) ||
2683 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2684 sizeof(rxnfc->rule_cnt)))
2685 return -EFAULT;
2686
2687 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2688 /* As an optimisation, we only copy the actual
2689 * number of rules that the underlying
2690 * function returned. Since Mallory might
2691 * change the rule count in user memory, we
2692 * check that it is less than the rule count
2693 * originally given (as the user buffer size),
2694 * which has been range-checked.
2695 */
2696 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2697 return -EFAULT;
2698 if (actual_rule_cnt < rule_cnt)
2699 rule_cnt = actual_rule_cnt;
2700 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2701 &rxnfc->rule_locs[0],
2702 rule_cnt * sizeof(u32)))
2703 return -EFAULT;
2704 }
2705 }
2706
2707 return 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002708}
2709
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002710static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2711{
2712 void __user *uptr;
2713 compat_uptr_t uptr32;
2714 struct ifreq __user *uifr;
2715
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002716 uifr = compat_alloc_user_space(sizeof(*uifr));
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002717 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2718 return -EFAULT;
2719
2720 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2721 return -EFAULT;
2722
2723 uptr = compat_ptr(uptr32);
2724
2725 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2726 return -EFAULT;
2727
2728 return dev_ioctl(net, SIOCWANDEV, uifr);
2729}
2730
Arnd Bergmann6b960182009-11-06 23:10:54 -08002731static int bond_ioctl(struct net *net, unsigned int cmd,
2732 struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002733{
2734 struct ifreq kifr;
2735 struct ifreq __user *uifr;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002736 mm_segment_t old_fs;
2737 int err;
2738 u32 data;
2739 void __user *datap;
2740
2741 switch (cmd) {
2742 case SIOCBONDENSLAVE:
2743 case SIOCBONDRELEASE:
2744 case SIOCBONDSETHWADDR:
2745 case SIOCBONDCHANGEACTIVE:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002746 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002747 return -EFAULT;
2748
2749 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002750 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002751 err = dev_ioctl(net, cmd,
2752 (struct ifreq __user __force *) &kifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002753 set_fs(old_fs);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002754
2755 return err;
2756 case SIOCBONDSLAVEINFOQUERY:
2757 case SIOCBONDINFOQUERY:
2758 uifr = compat_alloc_user_space(sizeof(*uifr));
2759 if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2760 return -EFAULT;
2761
2762 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2763 return -EFAULT;
2764
2765 datap = compat_ptr(data);
2766 if (put_user(datap, &uifr->ifr_ifru.ifru_data))
2767 return -EFAULT;
2768
Arnd Bergmann6b960182009-11-06 23:10:54 -08002769 return dev_ioctl(net, cmd, uifr);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002770 default:
2771 return -EINVAL;
Joe Perchesccbd6a52010-05-14 10:58:26 +00002772 }
Arnd Bergmann7a229382009-11-06 23:00:29 -08002773}
2774
Arnd Bergmann6b960182009-11-06 23:10:54 -08002775static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
2776 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002777{
2778 struct ifreq __user *u_ifreq64;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002779 char tmp_buf[IFNAMSIZ];
2780 void __user *data64;
2781 u32 data32;
2782
2783 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
2784 IFNAMSIZ))
2785 return -EFAULT;
2786 if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
2787 return -EFAULT;
2788 data64 = compat_ptr(data32);
2789
2790 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
2791
2792 /* Don't check these user accesses, just let that get trapped
2793 * in the ioctl handler instead.
2794 */
2795 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
2796 IFNAMSIZ))
2797 return -EFAULT;
2798 if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
2799 return -EFAULT;
2800
Arnd Bergmann6b960182009-11-06 23:10:54 -08002801 return dev_ioctl(net, cmd, u_ifreq64);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002802}
2803
Arnd Bergmann6b960182009-11-06 23:10:54 -08002804static int dev_ifsioc(struct net *net, struct socket *sock,
2805 unsigned int cmd, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002806{
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002807 struct ifreq __user *uifr;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002808 int err;
2809
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002810 uifr = compat_alloc_user_space(sizeof(*uifr));
2811 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
2812 return -EFAULT;
2813
2814 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
2815
Arnd Bergmann7a229382009-11-06 23:00:29 -08002816 if (!err) {
2817 switch (cmd) {
2818 case SIOCGIFFLAGS:
2819 case SIOCGIFMETRIC:
2820 case SIOCGIFMTU:
2821 case SIOCGIFMEM:
2822 case SIOCGIFHWADDR:
2823 case SIOCGIFINDEX:
2824 case SIOCGIFADDR:
2825 case SIOCGIFBRDADDR:
2826 case SIOCGIFDSTADDR:
2827 case SIOCGIFNETMASK:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002828 case SIOCGIFPFLAGS:
Arnd Bergmann7a229382009-11-06 23:00:29 -08002829 case SIOCGIFTXQLEN:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002830 case SIOCGMIIPHY:
2831 case SIOCGMIIREG:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002832 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002833 err = -EFAULT;
2834 break;
2835 }
2836 }
2837 return err;
2838}
2839
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002840static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2841 struct compat_ifreq __user *uifr32)
2842{
2843 struct ifreq ifr;
2844 struct compat_ifmap __user *uifmap32;
2845 mm_segment_t old_fs;
2846 int err;
2847
2848 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2849 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
2850 err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2851 err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2852 err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2853 err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq);
2854 err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma);
2855 err |= __get_user(ifr.ifr_map.port, &uifmap32->port);
2856 if (err)
2857 return -EFAULT;
2858
2859 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002860 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002861 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002862 set_fs(old_fs);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002863
2864 if (cmd == SIOCGIFMAP && !err) {
2865 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
2866 err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2867 err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2868 err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2869 err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq);
2870 err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma);
2871 err |= __put_user(ifr.ifr_map.port, &uifmap32->port);
2872 if (err)
2873 err = -EFAULT;
2874 }
2875 return err;
2876}
2877
2878static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32)
2879{
2880 void __user *uptr;
2881 compat_uptr_t uptr32;
2882 struct ifreq __user *uifr;
2883
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002884 uifr = compat_alloc_user_space(sizeof(*uifr));
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002885 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2886 return -EFAULT;
2887
2888 if (get_user(uptr32, &uifr32->ifr_data))
2889 return -EFAULT;
2890
2891 uptr = compat_ptr(uptr32);
2892
2893 if (put_user(uptr, &uifr->ifr_data))
2894 return -EFAULT;
2895
2896 return dev_ioctl(net, SIOCSHWTSTAMP, uifr);
2897}
2898
Arnd Bergmann7a229382009-11-06 23:00:29 -08002899struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002900 u32 rt_pad1;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002901 struct sockaddr rt_dst; /* target address */
2902 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
2903 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002904 unsigned short rt_flags;
2905 short rt_pad2;
2906 u32 rt_pad3;
2907 unsigned char rt_tos;
2908 unsigned char rt_class;
2909 short rt_pad4;
2910 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a229382009-11-06 23:00:29 -08002911 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002912 u32 rt_mtu; /* per route MTU/Window */
2913 u32 rt_window; /* Window clamping */
Arnd Bergmann7a229382009-11-06 23:00:29 -08002914 unsigned short rt_irtt; /* Initial RTT */
2915};
2916
2917struct in6_rtmsg32 {
2918 struct in6_addr rtmsg_dst;
2919 struct in6_addr rtmsg_src;
2920 struct in6_addr rtmsg_gateway;
2921 u32 rtmsg_type;
2922 u16 rtmsg_dst_len;
2923 u16 rtmsg_src_len;
2924 u32 rtmsg_metric;
2925 u32 rtmsg_info;
2926 u32 rtmsg_flags;
2927 s32 rtmsg_ifindex;
2928};
2929
Arnd Bergmann6b960182009-11-06 23:10:54 -08002930static int routing_ioctl(struct net *net, struct socket *sock,
2931 unsigned int cmd, void __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002932{
2933 int ret;
2934 void *r = NULL;
2935 struct in6_rtmsg r6;
2936 struct rtentry r4;
2937 char devname[16];
2938 u32 rtdev;
2939 mm_segment_t old_fs = get_fs();
2940
Arnd Bergmann6b960182009-11-06 23:10:54 -08002941 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
2942 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002943 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08002944 3 * sizeof(struct in6_addr));
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002945 ret |= __get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
2946 ret |= __get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
2947 ret |= __get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
2948 ret |= __get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
2949 ret |= __get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
2950 ret |= __get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
2951 ret |= __get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a229382009-11-06 23:00:29 -08002952
2953 r = (void *) &r6;
2954 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08002955 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002956 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08002957 3 * sizeof(struct sockaddr));
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002958 ret |= __get_user(r4.rt_flags, &(ur4->rt_flags));
2959 ret |= __get_user(r4.rt_metric, &(ur4->rt_metric));
2960 ret |= __get_user(r4.rt_mtu, &(ur4->rt_mtu));
2961 ret |= __get_user(r4.rt_window, &(ur4->rt_window));
2962 ret |= __get_user(r4.rt_irtt, &(ur4->rt_irtt));
2963 ret |= __get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a229382009-11-06 23:00:29 -08002964 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002965 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002966 r4.rt_dev = (char __user __force *)devname;
2967 devname[15] = 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002968 } else
2969 r4.rt_dev = NULL;
2970
2971 r = (void *) &r4;
2972 }
2973
2974 if (ret) {
2975 ret = -EFAULT;
2976 goto out;
2977 }
2978
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002979 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002980 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002981 set_fs(old_fs);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002982
2983out:
Arnd Bergmann7a229382009-11-06 23:00:29 -08002984 return ret;
2985}
2986
2987/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
2988 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002989 * use compatible ioctls
Arnd Bergmann7a229382009-11-06 23:00:29 -08002990 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08002991static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002992{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002993 compat_ulong_t tmp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002994
Arnd Bergmann6b960182009-11-06 23:10:54 -08002995 if (get_user(tmp, argp))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002996 return -EFAULT;
2997 if (tmp == BRCTL_GET_VERSION)
2998 return BRCTL_VERSION + 1;
2999 return -EINVAL;
3000}
3001
Arnd Bergmann6b960182009-11-06 23:10:54 -08003002static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3003 unsigned int cmd, unsigned long arg)
3004{
3005 void __user *argp = compat_ptr(arg);
3006 struct sock *sk = sock->sk;
3007 struct net *net = sock_net(sk);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003008
Arnd Bergmann6b960182009-11-06 23:10:54 -08003009 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3010 return siocdevprivate_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003011
Arnd Bergmann6b960182009-11-06 23:10:54 -08003012 switch (cmd) {
3013 case SIOCSIFBR:
3014 case SIOCGIFBR:
3015 return old_bridge_ioctl(argp);
3016 case SIOCGIFNAME:
3017 return dev_ifname32(net, argp);
3018 case SIOCGIFCONF:
3019 return dev_ifconf(net, argp);
3020 case SIOCETHTOOL:
3021 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003022 case SIOCWANDEV:
3023 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003024 case SIOCGIFMAP:
3025 case SIOCSIFMAP:
3026 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003027 case SIOCBONDENSLAVE:
3028 case SIOCBONDRELEASE:
3029 case SIOCBONDSETHWADDR:
3030 case SIOCBONDSLAVEINFOQUERY:
3031 case SIOCBONDINFOQUERY:
3032 case SIOCBONDCHANGEACTIVE:
3033 return bond_ioctl(net, cmd, argp);
3034 case SIOCADDRT:
3035 case SIOCDELRT:
3036 return routing_ioctl(net, sock, cmd, argp);
3037 case SIOCGSTAMP:
3038 return do_siocgstamp(net, sock, cmd, argp);
3039 case SIOCGSTAMPNS:
3040 return do_siocgstampns(net, sock, cmd, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003041 case SIOCSHWTSTAMP:
3042 return compat_siocshwtstamp(net, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003043
Arnd Bergmann6b960182009-11-06 23:10:54 -08003044 case FIOSETOWN:
3045 case SIOCSPGRP:
3046 case FIOGETOWN:
3047 case SIOCGPGRP:
3048 case SIOCBRADDBR:
3049 case SIOCBRDELBR:
3050 case SIOCGIFVLAN:
3051 case SIOCSIFVLAN:
3052 case SIOCADDDLCI:
3053 case SIOCDELDLCI:
3054 return sock_ioctl(file, cmd, arg);
3055
3056 case SIOCGIFFLAGS:
3057 case SIOCSIFFLAGS:
3058 case SIOCGIFMETRIC:
3059 case SIOCSIFMETRIC:
3060 case SIOCGIFMTU:
3061 case SIOCSIFMTU:
3062 case SIOCGIFMEM:
3063 case SIOCSIFMEM:
3064 case SIOCGIFHWADDR:
3065 case SIOCSIFHWADDR:
3066 case SIOCADDMULTI:
3067 case SIOCDELMULTI:
3068 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003069 case SIOCGIFADDR:
3070 case SIOCSIFADDR:
3071 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003072 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003073 case SIOCGIFBRDADDR:
3074 case SIOCSIFBRDADDR:
3075 case SIOCGIFDSTADDR:
3076 case SIOCSIFDSTADDR:
3077 case SIOCGIFNETMASK:
3078 case SIOCSIFNETMASK:
3079 case SIOCSIFPFLAGS:
3080 case SIOCGIFPFLAGS:
3081 case SIOCGIFTXQLEN:
3082 case SIOCSIFTXQLEN:
3083 case SIOCBRADDIF:
3084 case SIOCBRDELIF:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003085 case SIOCSIFNAME:
3086 case SIOCGMIIPHY:
3087 case SIOCGMIIREG:
3088 case SIOCSMIIREG:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003089 return dev_ifsioc(net, sock, cmd, argp);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003090
Arnd Bergmann6b960182009-11-06 23:10:54 -08003091 case SIOCSARP:
3092 case SIOCGARP:
3093 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003094 case SIOCATMARK:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003095 return sock_do_ioctl(net, sock, cmd, arg);
3096 }
3097
3098 /* Prevent warning from compat_sys_ioctl, these always
3099 * result in -EINVAL in the native case anyway. */
3100 switch (cmd) {
3101 case SIOCRTMSG:
3102 case SIOCGIFCOUNT:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003103 case SIOCSRARP:
3104 case SIOCGRARP:
3105 case SIOCDRARP:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003106 case SIOCSIFLINK:
3107 case SIOCGIFSLAVE:
3108 case SIOCSIFSLAVE:
3109 return -EINVAL;
Arnd Bergmann6b960182009-11-06 23:10:54 -08003110 }
3111
3112 return -ENOIOCTLCMD;
3113}
Arnd Bergmann7a229382009-11-06 23:00:29 -08003114
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003115static long compat_sock_ioctl(struct file *file, unsigned cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003116 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003117{
3118 struct socket *sock = file->private_data;
3119 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003120 struct sock *sk;
3121 struct net *net;
3122
3123 sk = sock->sk;
3124 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003125
3126 if (sock->ops->compat_ioctl)
3127 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3128
David S. Miller87de87d2008-06-03 09:14:03 -07003129 if (ret == -ENOIOCTLCMD &&
3130 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3131 ret = compat_wext_handle_ioctl(net, cmd, arg);
3132
Arnd Bergmann6b960182009-11-06 23:10:54 -08003133 if (ret == -ENOIOCTLCMD)
3134 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3135
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003136 return ret;
3137}
3138#endif
3139
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003140int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3141{
3142 return sock->ops->bind(sock, addr, addrlen);
3143}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003144EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003145
3146int kernel_listen(struct socket *sock, int backlog)
3147{
3148 return sock->ops->listen(sock, backlog);
3149}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003150EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003151
3152int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3153{
3154 struct sock *sk = sock->sk;
3155 int err;
3156
3157 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3158 newsock);
3159 if (err < 0)
3160 goto done;
3161
3162 err = sock->ops->accept(sock, *newsock, flags);
3163 if (err < 0) {
3164 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003165 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003166 goto done;
3167 }
3168
3169 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003170 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003171
3172done:
3173 return err;
3174}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003175EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003176
3177int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003178 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003179{
3180 return sock->ops->connect(sock, addr, addrlen, flags);
3181}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003182EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003183
3184int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3185 int *addrlen)
3186{
3187 return sock->ops->getname(sock, addr, addrlen, 0);
3188}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003189EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003190
3191int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3192 int *addrlen)
3193{
3194 return sock->ops->getname(sock, addr, addrlen, 1);
3195}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003196EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003197
3198int kernel_getsockopt(struct socket *sock, int level, int optname,
3199 char *optval, int *optlen)
3200{
3201 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003202 char __user *uoptval;
3203 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003204 int err;
3205
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003206 uoptval = (char __user __force *) optval;
3207 uoptlen = (int __user __force *) optlen;
3208
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003209 set_fs(KERNEL_DS);
3210 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003211 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003212 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003213 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3214 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003215 set_fs(oldfs);
3216 return err;
3217}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003218EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003219
3220int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003221 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003222{
3223 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003224 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003225 int err;
3226
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003227 uoptval = (char __user __force *) optval;
3228
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003229 set_fs(KERNEL_DS);
3230 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003231 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003232 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003233 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003234 optlen);
3235 set_fs(oldfs);
3236 return err;
3237}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003238EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003239
3240int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3241 size_t size, int flags)
3242{
Herbert Xuf8451722010-05-24 00:12:34 -07003243 sock_update_classid(sock->sk);
3244
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003245 if (sock->ops->sendpage)
3246 return sock->ops->sendpage(sock, page, offset, size, flags);
3247
3248 return sock_no_sendpage(sock, page, offset, size, flags);
3249}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003250EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003251
3252int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3253{
3254 mm_segment_t oldfs = get_fs();
3255 int err;
3256
3257 set_fs(KERNEL_DS);
3258 err = sock->ops->ioctl(sock, cmd, arg);
3259 set_fs(oldfs);
3260
3261 return err;
3262}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003263EXPORT_SYMBOL(kernel_sock_ioctl);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003264
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003265int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3266{
3267 return sock->ops->shutdown(sock, how);
3268}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003269EXPORT_SYMBOL(kernel_sock_shutdown);