blob: 28a96af484b421ee06fffbe87358c1811693c97f [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
266static void sock_destroy_inode(struct inode *inode)
267{
Eric Dumazet43815482010-04-29 11:01:49 +0000268 struct socket_alloc *ei;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000269 struct socket_wq *wq;
Eric Dumazet43815482010-04-29 11:01:49 +0000270
271 ei = container_of(inode, struct socket_alloc, vfs_inode);
Eric Dumazeteaefd112011-02-18 03:26:36 +0000272 wq = rcu_dereference_protected(ei->socket.wq, 1);
Lai Jiangshan61845222011-03-18 12:10:25 +0800273 kfree_rcu(wq, rcu);
Eric Dumazet43815482010-04-29 11:01:49 +0000274 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275}
276
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700277static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700279 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Christoph Lametera35afb82007-05-16 22:10:57 -0700281 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284static int init_inodecache(void)
285{
286 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700287 sizeof(struct socket_alloc),
288 0,
289 (SLAB_HWCACHE_ALIGN |
290 SLAB_RECLAIM_ACCOUNT |
291 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900292 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 if (sock_inode_cachep == NULL)
294 return -ENOMEM;
295 return 0;
296}
297
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700298static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700299 .alloc_inode = sock_alloc_inode,
300 .destroy_inode = sock_destroy_inode,
301 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302};
303
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700304/*
305 * sockfs_dname() is called from d_path().
306 */
307static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
308{
309 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
310 dentry->d_inode->i_ino);
311}
312
Al Viro3ba13d12009-02-20 06:02:22 +0000313static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700314 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315};
316
Al Viroc74a1cb2011-01-12 16:59:34 -0500317static struct dentry *sockfs_mount(struct file_system_type *fs_type,
318 int flags, const char *dev_name, void *data)
319{
320 return mount_pseudo(fs_type, "socket:", &sockfs_ops,
321 &sockfs_dentry_operations, SOCKFS_MAGIC);
322}
323
324static struct vfsmount *sock_mnt __read_mostly;
325
326static struct file_system_type sock_fs_type = {
327 .name = "sockfs",
328 .mount = sockfs_mount,
329 .kill_sb = kill_anon_super,
330};
331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332/*
333 * Obtains the first available file descriptor and sets it up for use.
334 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800335 * These functions create file structures and maps them to fd space
336 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 * and file struct implicitly stored in sock->file.
338 * Note that another thread may close file descriptor before we return
339 * from this function. We use the fact that now we do not refer
340 * to socket after mapping. If one day we will need it, this
341 * function will increment ref. count on file by 1.
342 *
343 * In any case returned fd MAY BE not valid!
344 * This race condition is unavoidable
345 * with shared fd spaces, we cannot solve it inside kernel,
346 * but we take care of internal coherence yet.
347 */
348
Al Viro7cbe66b2009-08-05 19:59:08 +0400349static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350{
Al Viro7cbe66b2009-08-05 19:59:08 +0400351 struct qstr name = { .name = "" };
Al Viro2c48b9c2009-08-09 00:52:35 +0400352 struct path path;
Al Viro7cbe66b2009-08-05 19:59:08 +0400353 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 int fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800355
Ulrich Dreppera677a032008-07-23 21:29:17 -0700356 fd = get_unused_fd_flags(flags);
Al Viro7cbe66b2009-08-05 19:59:08 +0400357 if (unlikely(fd < 0))
358 return fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800359
Nick Piggin4b936882011-01-07 17:50:07 +1100360 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
Al Viro2c48b9c2009-08-09 00:52:35 +0400361 if (unlikely(!path.dentry)) {
Al Viro7cbe66b2009-08-05 19:59:08 +0400362 put_unused_fd(fd);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800363 return -ENOMEM;
Al Viro7cbe66b2009-08-05 19:59:08 +0400364 }
Al Viro2c48b9c2009-08-09 00:52:35 +0400365 path.mnt = mntget(sock_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
Al Viro2c48b9c2009-08-09 00:52:35 +0400367 d_instantiate(path.dentry, SOCK_INODE(sock));
Al Virocc3808f2009-08-06 09:43:59 +0400368 SOCK_INODE(sock)->i_fop = &socket_file_ops;
369
Al Viro2c48b9c2009-08-09 00:52:35 +0400370 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
Al Virocc3808f2009-08-06 09:43:59 +0400371 &socket_file_ops);
372 if (unlikely(!file)) {
373 /* drop dentry, keep inode */
Al Viro7de9c6ee2010-10-23 11:11:40 -0400374 ihold(path.dentry->d_inode);
Al Viro2c48b9c2009-08-09 00:52:35 +0400375 path_put(&path);
Al Virocc3808f2009-08-06 09:43:59 +0400376 put_unused_fd(fd);
377 return -ENFILE;
378 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800379
380 sock->file = file;
Ulrich Drepper77d27202008-07-23 21:29:35 -0700381 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800382 file->f_pos = 0;
383 file->private_data = sock;
384
Al Viro7cbe66b2009-08-05 19:59:08 +0400385 *f = file;
386 return fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800387}
388
Ulrich Dreppera677a032008-07-23 21:29:17 -0700389int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800390{
391 struct file *newfile;
Al Viro7cbe66b2009-08-05 19:59:08 +0400392 int fd = sock_alloc_file(sock, &newfile, flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800393
Al Viro7cbe66b2009-08-05 19:59:08 +0400394 if (likely(fd >= 0))
David S. Miller39d8c1b2006-03-20 17:13:49 -0800395 fd_install(fd, newfile);
Al Viro7cbe66b2009-08-05 19:59:08 +0400396
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 return fd;
398}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700399EXPORT_SYMBOL(sock_map_fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800401static struct socket *sock_from_file(struct file *file, int *err)
402{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800403 if (file->f_op == &socket_file_ops)
404 return file->private_data; /* set in sock_map_fd */
405
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800406 *err = -ENOTSOCK;
407 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800408}
409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700411 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 * @fd: file handle
413 * @err: pointer to an error code return
414 *
415 * The file handle passed in is locked and the socket it is bound
416 * too is returned. If an error occurs the err pointer is overwritten
417 * with a negative errno code and NULL is returned. The function checks
418 * for both invalid handles and passing a handle which is not a socket.
419 *
420 * On a success the socket object pointer is returned.
421 */
422
423struct socket *sockfd_lookup(int fd, int *err)
424{
425 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 struct socket *sock;
427
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700428 file = fget(fd);
429 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 *err = -EBADF;
431 return NULL;
432 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700433
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800434 sock = sock_from_file(file, err);
435 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 return sock;
438}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700439EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800441static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
442{
443 struct file *file;
444 struct socket *sock;
445
Hua Zhong36725582006-04-19 15:25:02 -0700446 *err = -EBADF;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800447 file = fget_light(fd, fput_needed);
448 if (file) {
449 sock = sock_from_file(file, err);
450 if (sock)
451 return sock;
452 fput_light(file, *fput_needed);
453 }
454 return NULL;
455}
456
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457/**
458 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700459 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 * Allocate a new inode and socket object. The two are bound together
461 * and initialised. The socket is then returned. If we are out of inodes
462 * NULL is returned.
463 */
464
465static struct socket *sock_alloc(void)
466{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700467 struct inode *inode;
468 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200470 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 if (!inode)
472 return NULL;
473
474 sock = SOCKET_I(inode);
475
Eric Dumazet29a020d2009-09-15 02:39:20 -0700476 kmemcheck_annotate_bitfield(sock, type);
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400477 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700478 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100479 inode->i_uid = current_fsuid();
480 inode->i_gid = current_fsgid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
Eric Dumazet4e694892009-04-04 16:41:09 -0700482 percpu_add(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 return sock;
484}
485
486/*
487 * In theory you can't get an open on this inode, but /proc provides
488 * a back door. Remember to keep it shut otherwise you'll let the
489 * creepy crawlies in.
490 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700491
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
493{
494 return -ENXIO;
495}
496
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800497const struct file_operations bad_sock_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 .owner = THIS_MODULE,
499 .open = sock_no_open,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200500 .llseek = noop_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501};
502
503/**
504 * sock_release - close a socket
505 * @sock: socket to close
506 *
507 * The socket is released from the protocol stack if it has a release
508 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700509 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512void sock_release(struct socket *sock)
513{
514 if (sock->ops) {
515 struct module *owner = sock->ops->owner;
516
517 sock->ops->release(sock);
518 sock->ops = NULL;
519 module_put(owner);
520 }
521
Eric Dumazeteaefd112011-02-18 03:26:36 +0000522 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 printk(KERN_ERR "sock_release: fasync list not empty!\n");
524
Eric Dumazet4e694892009-04-04 16:41:09 -0700525 percpu_sub(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 if (!sock->file) {
527 iput(SOCK_INODE(sock));
528 return;
529 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700530 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700532EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000534int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000535{
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000536 *tx_flags = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000537 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000538 *tx_flags |= SKBTX_HW_TSTAMP;
Patrick Ohly20d49472009-02-12 05:03:38 +0000539 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000540 *tx_flags |= SKBTX_SW_TSTAMP;
Johannes Berg6e3e9392011-11-09 10:15:42 +0100541 if (sock_flag(sk, SOCK_WIFI_STATUS))
542 *tx_flags |= SKBTX_WIFI_STATUS;
Patrick Ohly20d49472009-02-12 05:03:38 +0000543 return 0;
544}
545EXPORT_SYMBOL(sock_tx_timestamp);
546
Anton Blanchard228e5482011-05-02 20:21:35 +0000547static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
548 struct msghdr *msg, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549{
550 struct sock_iocb *si = kiocb_to_siocb(iocb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Herbert Xuf8451722010-05-24 00:12:34 -0700552 sock_update_classid(sock->sk);
553
Neil Horman5bc14212011-11-22 05:10:51 +0000554 sock_update_netprioidx(sock->sk);
555
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 si->sock = sock;
557 si->scm = NULL;
558 si->msg = msg;
559 si->size = size;
560
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 return sock->ops->sendmsg(iocb, sock, msg, size);
562}
563
Anton Blanchard228e5482011-05-02 20:21:35 +0000564static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
565 struct msghdr *msg, size_t size)
566{
567 int err = security_socket_sendmsg(sock, msg, size);
568
569 return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
570}
571
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
573{
574 struct kiocb iocb;
575 struct sock_iocb siocb;
576 int ret;
577
578 init_sync_kiocb(&iocb, NULL);
579 iocb.private = &siocb;
580 ret = __sock_sendmsg(&iocb, sock, msg, size);
581 if (-EIOCBQUEUED == ret)
582 ret = wait_on_sync_kiocb(&iocb);
583 return ret;
584}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700585EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
Eric Dumazet894dc242011-07-26 02:39:41 +0000587static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
Anton Blanchard228e5482011-05-02 20:21:35 +0000588{
589 struct kiocb iocb;
590 struct sock_iocb siocb;
591 int ret;
592
593 init_sync_kiocb(&iocb, NULL);
594 iocb.private = &siocb;
595 ret = __sock_sendmsg_nosec(&iocb, sock, msg, size);
596 if (-EIOCBQUEUED == ret)
597 ret = wait_on_sync_kiocb(&iocb);
598 return ret;
599}
600
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
602 struct kvec *vec, size_t num, size_t size)
603{
604 mm_segment_t oldfs = get_fs();
605 int result;
606
607 set_fs(KERNEL_DS);
608 /*
609 * the following is safe, since for compiler definitions of kvec and
610 * iovec are identical, yielding the same in-core layout and alignment
611 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700612 msg->msg_iov = (struct iovec *)vec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 msg->msg_iovlen = num;
614 result = sock_sendmsg(sock, msg, size);
615 set_fs(oldfs);
616 return result;
617}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700618EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Patrick Ohly20d49472009-02-12 05:03:38 +0000620static int ktime2ts(ktime_t kt, struct timespec *ts)
621{
622 if (kt.tv64) {
623 *ts = ktime_to_timespec(kt);
624 return 1;
625 } else {
626 return 0;
627 }
628}
629
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700630/*
631 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
632 */
633void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
634 struct sk_buff *skb)
635{
Patrick Ohly20d49472009-02-12 05:03:38 +0000636 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
637 struct timespec ts[3];
638 int empty = 1;
639 struct skb_shared_hwtstamps *shhwtstamps =
640 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700641
Patrick Ohly20d49472009-02-12 05:03:38 +0000642 /* Race occurred between timestamp enabling and packet
643 receiving. Fill in the current time for now. */
644 if (need_software_tstamp && skb->tstamp.tv64 == 0)
645 __net_timestamp(skb);
646
647 if (need_software_tstamp) {
648 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
649 struct timeval tv;
650 skb_get_timestamp(skb, &tv);
651 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
652 sizeof(tv), &tv);
653 } else {
Hagen Paul Pfeifer842509b2010-04-06 05:39:52 +0000654 skb_get_timestampns(skb, &ts[0]);
Patrick Ohly20d49472009-02-12 05:03:38 +0000655 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
Hagen Paul Pfeifer842509b2010-04-06 05:39:52 +0000656 sizeof(ts[0]), &ts[0]);
Patrick Ohly20d49472009-02-12 05:03:38 +0000657 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700658 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000659
660
661 memset(ts, 0, sizeof(ts));
662 if (skb->tstamp.tv64 &&
663 sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) {
664 skb_get_timestampns(skb, ts + 0);
665 empty = 0;
666 }
667 if (shhwtstamps) {
668 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
669 ktime2ts(shhwtstamps->syststamp, ts + 1))
670 empty = 0;
671 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
672 ktime2ts(shhwtstamps->hwtstamp, ts + 2))
673 empty = 0;
674 }
675 if (!empty)
676 put_cmsg(msg, SOL_SOCKET,
677 SCM_TIMESTAMPING, sizeof(ts), &ts);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700678}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300679EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
680
Johannes Berg6e3e9392011-11-09 10:15:42 +0100681void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
682 struct sk_buff *skb)
683{
684 int ack;
685
686 if (!sock_flag(sk, SOCK_WIFI_STATUS))
687 return;
688 if (!skb->wifi_acked_valid)
689 return;
690
691 ack = skb->wifi_acked;
692
693 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
694}
695EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
696
stephen hemminger11165f12010-10-18 14:27:29 +0000697static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
698 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700699{
700 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
701 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
702 sizeof(__u32), &skb->dropcount);
703}
704
Eric Dumazet767dd032010-04-28 19:14:43 +0000705void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700706 struct sk_buff *skb)
707{
708 sock_recv_timestamp(msg, sk, skb);
709 sock_recv_drops(msg, sk, skb);
710}
Eric Dumazet767dd032010-04-28 19:14:43 +0000711EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700712
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700713static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
714 struct msghdr *msg, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 struct sock_iocb *si = kiocb_to_siocb(iocb);
717
Herbert Xuf8451722010-05-24 00:12:34 -0700718 sock_update_classid(sock->sk);
719
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 si->sock = sock;
721 si->scm = NULL;
722 si->msg = msg;
723 si->size = size;
724 si->flags = flags;
725
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
727}
728
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700729static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
730 struct msghdr *msg, size_t size, int flags)
731{
732 int err = security_socket_recvmsg(sock, msg, size, flags);
733
734 return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
735}
736
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700737int sock_recvmsg(struct socket *sock, struct msghdr *msg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 size_t size, int flags)
739{
740 struct kiocb iocb;
741 struct sock_iocb siocb;
742 int ret;
743
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700744 init_sync_kiocb(&iocb, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 iocb.private = &siocb;
746 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
747 if (-EIOCBQUEUED == ret)
748 ret = wait_on_sync_kiocb(&iocb);
749 return ret;
750}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700751EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700753static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
754 size_t size, int flags)
755{
756 struct kiocb iocb;
757 struct sock_iocb siocb;
758 int ret;
759
760 init_sync_kiocb(&iocb, NULL);
761 iocb.private = &siocb;
762 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
763 if (-EIOCBQUEUED == ret)
764 ret = wait_on_sync_kiocb(&iocb);
765 return ret;
766}
767
Martin Lucinac1249c02010-12-10 00:04:05 +0000768/**
769 * kernel_recvmsg - Receive a message from a socket (kernel space)
770 * @sock: The socket to receive the message from
771 * @msg: Received message
772 * @vec: Input s/g array for message data
773 * @num: Size of input s/g array
774 * @size: Number of bytes to read
775 * @flags: Message flags (MSG_DONTWAIT, etc...)
776 *
777 * On return the msg structure contains the scatter/gather array passed in the
778 * vec argument. The array is modified so that it consists of the unfilled
779 * portion of the original array.
780 *
781 * The returned value is the total number of bytes received, or an error.
782 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700783int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
784 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785{
786 mm_segment_t oldfs = get_fs();
787 int result;
788
789 set_fs(KERNEL_DS);
790 /*
791 * the following is safe, since for compiler definitions of kvec and
792 * iovec are identical, yielding the same in-core layout and alignment
793 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700794 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 result = sock_recvmsg(sock, msg, size, flags);
796 set_fs(oldfs);
797 return result;
798}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700799EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
801static void sock_aio_dtor(struct kiocb *iocb)
802{
803 kfree(iocb->private);
804}
805
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300806static ssize_t sock_sendpage(struct file *file, struct page *page,
807 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808{
809 struct socket *sock;
810 int flags;
811
Eric Dumazetb69aee02005-09-06 14:42:45 -0700812 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
814 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
815 if (more)
816 flags |= MSG_MORE;
817
Linus Torvaldse6949582009-08-13 08:28:36 -0700818 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819}
820
Jens Axboe9c55e012007-11-06 23:30:13 -0800821static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700822 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800823 unsigned int flags)
824{
825 struct socket *sock = file->private_data;
826
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800827 if (unlikely(!sock->ops->splice_read))
828 return -EINVAL;
829
Herbert Xuf8451722010-05-24 00:12:34 -0700830 sock_update_classid(sock->sk);
831
Jens Axboe9c55e012007-11-06 23:30:13 -0800832 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
833}
834
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800835static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700836 struct sock_iocb *siocb)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800837{
838 if (!is_sync_kiocb(iocb)) {
839 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
840 if (!siocb)
841 return NULL;
842 iocb->ki_dtor = sock_aio_dtor;
843 }
844
845 siocb->kiocb = iocb;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800846 iocb->private = siocb;
847 return siocb;
848}
849
850static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700851 struct file *file, const struct iovec *iov,
852 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800853{
854 struct socket *sock = file->private_data;
855 size_t size = 0;
856 int i;
857
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700858 for (i = 0; i < nr_segs; i++)
859 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800860
861 msg->msg_name = NULL;
862 msg->msg_namelen = 0;
863 msg->msg_control = NULL;
864 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700865 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800866 msg->msg_iovlen = nr_segs;
867 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
868
869 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
870}
871
Badari Pulavarty027445c2006-09-30 23:28:46 -0700872static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
873 unsigned long nr_segs, loff_t pos)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800874{
875 struct sock_iocb siocb, *x;
876
877 if (pos != 0)
878 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700879
880 if (iocb->ki_left == 0) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800881 return 0;
882
Badari Pulavarty027445c2006-09-30 23:28:46 -0700883
884 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800885 if (!x)
886 return -ENOMEM;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700887 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800888}
889
890static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700891 struct file *file, const struct iovec *iov,
892 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800893{
894 struct socket *sock = file->private_data;
895 size_t size = 0;
896 int i;
897
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700898 for (i = 0; i < nr_segs; i++)
899 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800900
901 msg->msg_name = NULL;
902 msg->msg_namelen = 0;
903 msg->msg_control = NULL;
904 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700905 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800906 msg->msg_iovlen = nr_segs;
907 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
908 if (sock->type == SOCK_SEQPACKET)
909 msg->msg_flags |= MSG_EOR;
910
911 return __sock_sendmsg(iocb, sock, msg, size);
912}
913
Badari Pulavarty027445c2006-09-30 23:28:46 -0700914static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
915 unsigned long nr_segs, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916{
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800917 struct sock_iocb siocb, *x;
918
919 if (pos != 0)
920 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700921
Badari Pulavarty027445c2006-09-30 23:28:46 -0700922 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800923 if (!x)
924 return -ENOMEM;
925
Badari Pulavarty027445c2006-09-30 23:28:46 -0700926 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927}
928
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929/*
930 * Atomic setting of ioctl hooks to avoid race
931 * with module unload.
932 */
933
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800934static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700935static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936
Eric W. Biederman881d9662007-09-17 11:56:21 -0700937void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800939 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800941 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942}
943EXPORT_SYMBOL(brioctl_set);
944
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800945static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700946static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
Eric W. Biederman881d9662007-09-17 11:56:21 -0700948void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800950 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800952 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953}
954EXPORT_SYMBOL(vlan_ioctl_set);
955
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800956static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700957static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700959void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800961 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800963 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964}
965EXPORT_SYMBOL(dlci_ioctl_set);
966
Arnd Bergmann6b960182009-11-06 23:10:54 -0800967static long sock_do_ioctl(struct net *net, struct socket *sock,
968 unsigned int cmd, unsigned long arg)
969{
970 int err;
971 void __user *argp = (void __user *)arg;
972
973 err = sock->ops->ioctl(sock, cmd, arg);
974
975 /*
976 * If this ioctl is unknown try to hand it down
977 * to the NIC driver.
978 */
979 if (err == -ENOIOCTLCMD)
980 err = dev_ioctl(net, cmd, argp);
981
982 return err;
983}
984
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985/*
986 * With an ioctl, arg may well be a user mode pointer, but we don't know
987 * what to do with it - that's up to the protocol still.
988 */
989
990static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
991{
992 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700993 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 void __user *argp = (void __user *)arg;
995 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700996 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997
Eric Dumazetb69aee02005-09-06 14:42:45 -0700998 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700999 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001000 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
Eric W. Biederman881d9662007-09-17 11:56:21 -07001002 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001004#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Eric W. Biederman881d9662007-09-17 11:56:21 -07001006 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001008#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001009 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 case FIOSETOWN:
1011 case SIOCSPGRP:
1012 err = -EFAULT;
1013 if (get_user(pid, (int __user *)argp))
1014 break;
1015 err = f_setown(sock->file, pid, 1);
1016 break;
1017 case FIOGETOWN:
1018 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001019 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001020 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 break;
1022 case SIOCGIFBR:
1023 case SIOCSIFBR:
1024 case SIOCBRADDBR:
1025 case SIOCBRDELBR:
1026 err = -ENOPKG;
1027 if (!br_ioctl_hook)
1028 request_module("bridge");
1029
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001030 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001031 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001032 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001033 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 break;
1035 case SIOCGIFVLAN:
1036 case SIOCSIFVLAN:
1037 err = -ENOPKG;
1038 if (!vlan_ioctl_hook)
1039 request_module("8021q");
1040
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001041 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001043 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001044 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 case SIOCADDDLCI:
1047 case SIOCDELDLCI:
1048 err = -ENOPKG;
1049 if (!dlci_ioctl_hook)
1050 request_module("dlci");
1051
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001052 mutex_lock(&dlci_ioctl_mutex);
1053 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001055 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 break;
1057 default:
Arnd Bergmann6b960182009-11-06 23:10:54 -08001058 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001060 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 return err;
1062}
1063
1064int sock_create_lite(int family, int type, int protocol, struct socket **res)
1065{
1066 int err;
1067 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001068
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 err = security_socket_create(family, type, protocol, 1);
1070 if (err)
1071 goto out;
1072
1073 sock = sock_alloc();
1074 if (!sock) {
1075 err = -ENOMEM;
1076 goto out;
1077 }
1078
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001080 err = security_socket_post_create(sock, family, type, protocol, 1);
1081 if (err)
1082 goto out_release;
1083
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084out:
1085 *res = sock;
1086 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001087out_release:
1088 sock_release(sock);
1089 sock = NULL;
1090 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001092EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093
1094/* No kernel lock held - perfect */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001095static unsigned int sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096{
1097 struct socket *sock;
1098
1099 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001100 * We can't return errors to poll, so it's either yes or no.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 */
Eric Dumazetb69aee02005-09-06 14:42:45 -07001102 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 return sock->ops->poll(file, sock, wait);
1104}
1105
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001106static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001108 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109
1110 return sock->ops->mmap(file, sock, vma);
1111}
1112
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001113static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114{
1115 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001116 * It was possible the inode is NULL we were
1117 * closing an unfinished socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 */
1119
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001120 if (!inode) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 printk(KERN_DEBUG "sock_close: NULL inode\n");
1122 return 0;
1123 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 sock_release(SOCKET_I(inode));
1125 return 0;
1126}
1127
1128/*
1129 * Update the socket async list
1130 *
1131 * Fasync_list locking strategy.
1132 *
1133 * 1. fasync_list is modified only under process context socket lock
1134 * i.e. under semaphore.
1135 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001136 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 */
1138
1139static int sock_fasync(int fd, struct file *filp, int on)
1140{
Eric Dumazet989a2972010-04-14 09:55:35 +00001141 struct socket *sock = filp->private_data;
1142 struct sock *sk = sock->sk;
Eric Dumazeteaefd112011-02-18 03:26:36 +00001143 struct socket_wq *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144
Eric Dumazet989a2972010-04-14 09:55:35 +00001145 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147
1148 lock_sock(sk);
Eric Dumazeteaefd112011-02-18 03:26:36 +00001149 wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
1150 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
Eric Dumazeteaefd112011-02-18 03:26:36 +00001152 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001153 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001154 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001155 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156
Eric Dumazet989a2972010-04-14 09:55:35 +00001157 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 return 0;
1159}
1160
Eric Dumazet43815482010-04-29 11:01:49 +00001161/* This function may be called only under socket lock or callback_lock or rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
1163int sock_wake_async(struct socket *sock, int how, int band)
1164{
Eric Dumazet43815482010-04-29 11:01:49 +00001165 struct socket_wq *wq;
1166
1167 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001169 rcu_read_lock();
1170 wq = rcu_dereference(sock->wq);
1171 if (!wq || !wq->fasync_list) {
1172 rcu_read_unlock();
1173 return -1;
1174 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001175 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001176 case SOCK_WAKE_WAITD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1178 break;
1179 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001180 case SOCK_WAKE_SPACE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1182 break;
1183 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001184 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001185call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001186 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001188 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001189 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 }
Eric Dumazet43815482010-04-29 11:01:49 +00001191 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 return 0;
1193}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001194EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
Pavel Emelyanov721db932010-09-29 16:06:32 +04001196int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001197 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198{
1199 int err;
1200 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001201 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202
1203 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001204 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 */
1206 if (family < 0 || family >= NPROTO)
1207 return -EAFNOSUPPORT;
1208 if (type < 0 || type >= SOCK_MAX)
1209 return -EINVAL;
1210
1211 /* Compatibility.
1212
1213 This uglymoron is moved from INET layer to here to avoid
1214 deadlock in module load.
1215 */
1216 if (family == PF_INET && type == SOCK_PACKET) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001217 static int warned;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 if (!warned) {
1219 warned = 1;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001220 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1221 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 }
1223 family = PF_PACKET;
1224 }
1225
1226 err = security_socket_create(family, type, protocol, kern);
1227 if (err)
1228 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001229
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001230 /*
1231 * Allocate the socket and allow the family to set things up. if
1232 * the protocol is 0, the family is instructed to select an appropriate
1233 * default.
1234 */
1235 sock = sock_alloc();
1236 if (!sock) {
1237 if (net_ratelimit())
1238 printk(KERN_WARNING "socket: no more sockets\n");
1239 return -ENFILE; /* Not exactly a match, but its the
1240 closest posix thing */
1241 }
1242
1243 sock->type = type;
1244
Johannes Berg95a5afc2008-10-16 15:24:51 -07001245#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001246 /* Attempt to load a protocol module if the find failed.
1247 *
1248 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 * requested real, full-featured networking support upon configuration.
1250 * Otherwise module support will break!
1251 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001252 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001253 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254#endif
1255
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001256 rcu_read_lock();
1257 pf = rcu_dereference(net_families[family]);
1258 err = -EAFNOSUPPORT;
1259 if (!pf)
1260 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261
1262 /*
1263 * We will call the ->create function, that possibly is in a loadable
1264 * module, so we have to bump that loadable module refcnt first.
1265 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001266 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 goto out_release;
1268
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001269 /* Now protected by module ref count */
1270 rcu_read_unlock();
1271
Eric Paris3f378b62009-11-05 22:18:14 -08001272 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001273 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001275
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 /*
1277 * Now to bump the refcnt of the [loadable] module that owns this
1278 * socket at sock_release time we decrement its refcnt.
1279 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001280 if (!try_module_get(sock->ops->owner))
1281 goto out_module_busy;
1282
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 /*
1284 * Now that we're done with the ->create function, the [loadable]
1285 * module can have its refcnt decremented
1286 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001287 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001288 err = security_socket_post_create(sock, family, type, protocol, kern);
1289 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001290 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001291 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001293 return 0;
1294
1295out_module_busy:
1296 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001298 sock->ops = NULL;
1299 module_put(pf->owner);
1300out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001302 return err;
1303
1304out_release:
1305 rcu_read_unlock();
1306 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001308EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309
1310int sock_create(int family, int type, int protocol, struct socket **res)
1311{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001312 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001314EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315
1316int sock_create_kern(int family, int type, int protocol, struct socket **res)
1317{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001318 return __sock_create(&init_net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001320EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001322SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323{
1324 int retval;
1325 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001326 int flags;
1327
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001328 /* Check the SOCK_* constants for consistency. */
1329 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1330 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1331 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1332 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1333
Ulrich Dreppera677a032008-07-23 21:29:17 -07001334 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001335 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001336 return -EINVAL;
1337 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001339 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1340 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1341
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 retval = sock_create(family, type, protocol, &sock);
1343 if (retval < 0)
1344 goto out;
1345
Ulrich Drepper77d27202008-07-23 21:29:35 -07001346 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 if (retval < 0)
1348 goto out_release;
1349
1350out:
1351 /* It may be already another descriptor 8) Not kernel problem. */
1352 return retval;
1353
1354out_release:
1355 sock_release(sock);
1356 return retval;
1357}
1358
1359/*
1360 * Create a pair of connected sockets.
1361 */
1362
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001363SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1364 int __user *, usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365{
1366 struct socket *sock1, *sock2;
1367 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001368 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001369 int flags;
1370
1371 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001372 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001373 return -EINVAL;
1374 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001376 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1377 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1378
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 /*
1380 * Obtain the first socket and check if the underlying protocol
1381 * supports the socketpair call.
1382 */
1383
1384 err = sock_create(family, type, protocol, &sock1);
1385 if (err < 0)
1386 goto out;
1387
1388 err = sock_create(family, type, protocol, &sock2);
1389 if (err < 0)
1390 goto out_release_1;
1391
1392 err = sock1->ops->socketpair(sock1, sock2);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001393 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 goto out_release_both;
1395
Al Viro7cbe66b2009-08-05 19:59:08 +04001396 fd1 = sock_alloc_file(sock1, &newfile1, flags);
David S. Millerbf3c23d2007-10-29 21:54:02 -07001397 if (unlikely(fd1 < 0)) {
1398 err = fd1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 goto out_release_both;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001400 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401
Al Viro7cbe66b2009-08-05 19:59:08 +04001402 fd2 = sock_alloc_file(sock2, &newfile2, flags);
Al Viro198de4d2009-08-05 19:29:23 +04001403 if (unlikely(fd2 < 0)) {
1404 err = fd2;
1405 fput(newfile1);
1406 put_unused_fd(fd1);
1407 sock_release(sock2);
1408 goto out;
Al Virodb349502007-02-07 01:48:00 -05001409 }
1410
Al Viro157cf642008-12-14 04:57:47 -05001411 audit_fd_pair(fd1, fd2);
Al Virodb349502007-02-07 01:48:00 -05001412 fd_install(fd1, newfile1);
1413 fd_install(fd2, newfile2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 /* fd1 and fd2 may be already another descriptors.
1415 * Not kernel problem.
1416 */
1417
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001418 err = put_user(fd1, &usockvec[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 if (!err)
1420 err = put_user(fd2, &usockvec[1]);
1421 if (!err)
1422 return 0;
1423
1424 sys_close(fd2);
1425 sys_close(fd1);
1426 return err;
1427
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428out_release_both:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001429 sock_release(sock2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430out_release_1:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001431 sock_release(sock1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432out:
1433 return err;
1434}
1435
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436/*
1437 * Bind a name to a socket. Nothing much to do here since it's
1438 * the protocol's responsibility to handle the local address.
1439 *
1440 * We move the socket address to kernel space before we call
1441 * the protocol layer (having also checked the address is ok).
1442 */
1443
Heiko Carstens20f37032009-01-14 14:14:23 +01001444SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445{
1446 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001447 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001448 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001450 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001451 if (sock) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001452 err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001453 if (err >= 0) {
1454 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001455 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001456 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001457 if (!err)
1458 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001459 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001460 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001462 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001463 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464 return err;
1465}
1466
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467/*
1468 * Perform a listen. Basically, we allow the protocol to do anything
1469 * necessary for a listen, and if that works, we mark the socket as
1470 * ready for listening.
1471 */
1472
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001473SYSCALL_DEFINE2(listen, int, fd, int, backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474{
1475 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001476 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001477 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001478
1479 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1480 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001481 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001482 if ((unsigned)backlog > somaxconn)
1483 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484
1485 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001486 if (!err)
1487 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001489 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 }
1491 return err;
1492}
1493
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494/*
1495 * For accept, we attempt to create a new socket, set up the link
1496 * with the client, wake up the client, then return the new
1497 * connected fd. We collect the address of the connector in kernel
1498 * space and move it to user at the very end. This is unclean because
1499 * we open the socket then return an error.
1500 *
1501 * 1003.1g adds the ability to recvmsg() to query connection pending
1502 * status to recvmsg. We need to add that support in a way thats
1503 * clean when we restucture accept also.
1504 */
1505
Heiko Carstens20f37032009-01-14 14:14:23 +01001506SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1507 int __user *, upeer_addrlen, int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508{
1509 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001510 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001511 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001512 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513
Ulrich Drepper77d27202008-07-23 21:29:35 -07001514 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001515 return -EINVAL;
1516
1517 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1518 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1519
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001520 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 if (!sock)
1522 goto out;
1523
1524 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001525 newsock = sock_alloc();
1526 if (!newsock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 goto out_put;
1528
1529 newsock->type = sock->type;
1530 newsock->ops = sock->ops;
1531
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 /*
1533 * We don't need try_module_get here, as the listening socket (sock)
1534 * has the protocol module (sock->ops->owner) held.
1535 */
1536 __module_get(newsock->ops->owner);
1537
Al Viro7cbe66b2009-08-05 19:59:08 +04001538 newfd = sock_alloc_file(newsock, &newfile, flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001539 if (unlikely(newfd < 0)) {
1540 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001541 sock_release(newsock);
1542 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001543 }
1544
Frank Filza79af592005-09-27 15:23:38 -07001545 err = security_socket_accept(sock, newsock);
1546 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001547 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001548
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1550 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001551 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552
1553 if (upeer_sockaddr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001554 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001555 &len, 2) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001557 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558 }
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001559 err = move_addr_to_user((struct sockaddr *)&address,
1560 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001562 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 }
1564
1565 /* File flags are not inherited via accept() unlike another OSes. */
1566
David S. Miller39d8c1b2006-03-20 17:13:49 -08001567 fd_install(newfd, newfile);
1568 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001571 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572out:
1573 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001574out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001575 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001576 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 goto out_put;
1578}
1579
Heiko Carstens20f37032009-01-14 14:14:23 +01001580SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1581 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001582{
Ulrich Drepperde11def2008-11-19 15:36:14 -08001583 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001584}
1585
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586/*
1587 * Attempt to connect to a socket with the server address. The address
1588 * is in user space so we verify it is OK and move it to kernel space.
1589 *
1590 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1591 * break bindings
1592 *
1593 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1594 * other SEQPACKET protocols that take time to connect() as it doesn't
1595 * include the -EINPROGRESS status for such sockets.
1596 */
1597
Heiko Carstens20f37032009-01-14 14:14:23 +01001598SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1599 int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600{
1601 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001602 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001603 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001605 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 if (!sock)
1607 goto out;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001608 err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609 if (err < 0)
1610 goto out_put;
1611
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001612 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001613 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 if (err)
1615 goto out_put;
1616
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001617 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618 sock->file->f_flags);
1619out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001620 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621out:
1622 return err;
1623}
1624
1625/*
1626 * Get the local address ('name') of a socket object. Move the obtained
1627 * name to user space.
1628 */
1629
Heiko Carstens20f37032009-01-14 14:14:23 +01001630SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1631 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632{
1633 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001634 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001635 int len, err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001636
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001637 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 if (!sock)
1639 goto out;
1640
1641 err = security_socket_getsockname(sock);
1642 if (err)
1643 goto out_put;
1644
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001645 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 if (err)
1647 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001648 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649
1650out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001651 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652out:
1653 return err;
1654}
1655
1656/*
1657 * Get the remote address ('name') of a socket object. Move the obtained
1658 * name to user space.
1659 */
1660
Heiko Carstens20f37032009-01-14 14:14:23 +01001661SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1662 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663{
1664 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001665 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001666 int len, err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001668 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1669 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 err = security_socket_getpeername(sock);
1671 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001672 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673 return err;
1674 }
1675
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001676 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001677 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001678 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 if (!err)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001680 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001681 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001682 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683 }
1684 return err;
1685}
1686
1687/*
1688 * Send a datagram to a given address. We move the address into kernel
1689 * space and check the user space data area is readable before invoking
1690 * the protocol.
1691 */
1692
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001693SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1694 unsigned, flags, struct sockaddr __user *, addr,
1695 int, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696{
1697 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001698 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 int err;
1700 struct msghdr msg;
1701 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001702 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001703
Linus Torvalds253eacc2010-10-30 16:43:10 -07001704 if (len > INT_MAX)
1705 len = INT_MAX;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001706 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1707 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001708 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001709
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001710 iov.iov_base = buff;
1711 iov.iov_len = len;
1712 msg.msg_name = NULL;
1713 msg.msg_iov = &iov;
1714 msg.msg_iovlen = 1;
1715 msg.msg_control = NULL;
1716 msg.msg_controllen = 0;
1717 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001718 if (addr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001719 err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 if (err < 0)
1721 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001722 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001723 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724 }
1725 if (sock->file->f_flags & O_NONBLOCK)
1726 flags |= MSG_DONTWAIT;
1727 msg.msg_flags = flags;
1728 err = sock_sendmsg(sock, &msg, len);
1729
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001730out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001731 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001732out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733 return err;
1734}
1735
1736/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001737 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738 */
1739
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001740SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1741 unsigned, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742{
1743 return sys_sendto(fd, buff, len, flags, NULL, 0);
1744}
1745
1746/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001747 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748 * sender. We verify the buffers are writable and if needed move the
1749 * sender address from kernel to user space.
1750 */
1751
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001752SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1753 unsigned, flags, struct sockaddr __user *, addr,
1754 int __user *, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755{
1756 struct socket *sock;
1757 struct iovec iov;
1758 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001759 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001760 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001761 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762
Linus Torvalds253eacc2010-10-30 16:43:10 -07001763 if (size > INT_MAX)
1764 size = INT_MAX;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001765 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001767 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001769 msg.msg_control = NULL;
1770 msg.msg_controllen = 0;
1771 msg.msg_iovlen = 1;
1772 msg.msg_iov = &iov;
1773 iov.iov_len = size;
1774 iov.iov_base = ubuf;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001775 msg.msg_name = (struct sockaddr *)&address;
1776 msg.msg_namelen = sizeof(address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 if (sock->file->f_flags & O_NONBLOCK)
1778 flags |= MSG_DONTWAIT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001779 err = sock_recvmsg(sock, &msg, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001781 if (err >= 0 && addr != NULL) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001782 err2 = move_addr_to_user((struct sockaddr *)&address,
1783 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001784 if (err2 < 0)
1785 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001787
1788 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001789out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001790 return err;
1791}
1792
1793/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001794 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795 */
1796
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001797asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1798 unsigned flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799{
1800 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1801}
1802
1803/*
1804 * Set a socket option. Because we don't know the option lengths we have
1805 * to pass the user mode parameter for the protocols to sort out.
1806 */
1807
Heiko Carstens20f37032009-01-14 14:14:23 +01001808SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1809 char __user *, optval, int, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001811 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812 struct socket *sock;
1813
1814 if (optlen < 0)
1815 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001816
1817 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1818 if (sock != NULL) {
1819 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001820 if (err)
1821 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822
1823 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001824 err =
1825 sock_setsockopt(sock, level, optname, optval,
1826 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001828 err =
1829 sock->ops->setsockopt(sock, level, optname, optval,
1830 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001831out_put:
1832 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 }
1834 return err;
1835}
1836
1837/*
1838 * Get a socket option. Because we don't know the option lengths we have
1839 * to pass a user mode parameter for the protocols to sort out.
1840 */
1841
Heiko Carstens20f37032009-01-14 14:14:23 +01001842SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1843 char __user *, optval, int __user *, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001845 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846 struct socket *sock;
1847
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001848 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1849 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001850 err = security_socket_getsockopt(sock, level, optname);
1851 if (err)
1852 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853
1854 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001855 err =
1856 sock_getsockopt(sock, level, optname, optval,
1857 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001859 err =
1860 sock->ops->getsockopt(sock, level, optname, optval,
1861 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001862out_put:
1863 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864 }
1865 return err;
1866}
1867
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868/*
1869 * Shutdown a socket.
1870 */
1871
Heiko Carstens754fe8d2009-01-14 14:14:09 +01001872SYSCALL_DEFINE2(shutdown, int, fd, int, how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001874 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 struct socket *sock;
1876
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001877 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1878 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001880 if (!err)
1881 err = sock->ops->shutdown(sock, how);
1882 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883 }
1884 return err;
1885}
1886
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001887/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888 * fields which are the same type (int / unsigned) on our platforms.
1889 */
1890#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1891#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1892#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1893
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001894struct used_address {
1895 struct sockaddr_storage name;
1896 unsigned int name_len;
1897};
1898
Anton Blanchard228e5482011-05-02 20:21:35 +00001899static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001900 struct msghdr *msg_sys, unsigned flags,
1901 struct used_address *used_address)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001903 struct compat_msghdr __user *msg_compat =
1904 (struct compat_msghdr __user *)msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001905 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07001907 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001908 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1909 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910 unsigned char *ctl_buf = ctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 int err, ctl_len, iov_size, total_len;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001912
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 err = -EFAULT;
1914 if (MSG_CMSG_COMPAT & flags) {
Anton Blanchard228e5482011-05-02 20:21:35 +00001915 if (get_compat_msghdr(msg_sys, msg_compat))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 return -EFAULT;
Anton Blanchard228e5482011-05-02 20:21:35 +00001917 } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 return -EFAULT;
1919
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920 /* do not move before msg_sys is valid */
1921 err = -EMSGSIZE;
Anton Blanchard228e5482011-05-02 20:21:35 +00001922 if (msg_sys->msg_iovlen > UIO_MAXIOV)
1923 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001925 /* Check whether to allocate the iovec area */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 err = -ENOMEM;
Anton Blanchard228e5482011-05-02 20:21:35 +00001927 iov_size = msg_sys->msg_iovlen * sizeof(struct iovec);
1928 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1930 if (!iov)
Anton Blanchard228e5482011-05-02 20:21:35 +00001931 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 }
1933
1934 /* This will also move the address data into kernel space */
1935 if (MSG_CMSG_COMPAT & flags) {
Anton Blanchard228e5482011-05-02 20:21:35 +00001936 err = verify_compat_iovec(msg_sys, iov,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001937 (struct sockaddr *)&address,
1938 VERIFY_READ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 } else
Anton Blanchard228e5482011-05-02 20:21:35 +00001940 err = verify_iovec(msg_sys, iov,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001941 (struct sockaddr *)&address,
1942 VERIFY_READ);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001943 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944 goto out_freeiov;
1945 total_len = err;
1946
1947 err = -ENOBUFS;
1948
Anton Blanchard228e5482011-05-02 20:21:35 +00001949 if (msg_sys->msg_controllen > INT_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00001951 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001953 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00001954 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001955 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956 if (err)
1957 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00001958 ctl_buf = msg_sys->msg_control;
1959 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001960 } else if (ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001961 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001963 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964 goto out_freeiov;
1965 }
1966 err = -EFAULT;
1967 /*
Anton Blanchard228e5482011-05-02 20:21:35 +00001968 * Careful! Before this, msg_sys->msg_control contains a user pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1970 * checking falls down on this.
1971 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00001972 if (copy_from_user(ctl_buf,
Anton Blanchard228e5482011-05-02 20:21:35 +00001973 (void __user __force *)msg_sys->msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001974 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00001976 msg_sys->msg_control = ctl_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977 }
Anton Blanchard228e5482011-05-02 20:21:35 +00001978 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979
1980 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00001981 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001982 /*
1983 * If this is sendmmsg() and current destination address is same as
1984 * previously succeeded address, omit asking LSM's decision.
1985 * used_address->name_len is initialized to UINT_MAX so that the first
1986 * destination address never matches.
1987 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07001988 if (used_address && msg_sys->msg_name &&
1989 used_address->name_len == msg_sys->msg_namelen &&
1990 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001991 used_address->name_len)) {
1992 err = sock_sendmsg_nosec(sock, msg_sys, total_len);
1993 goto out_freectl;
1994 }
1995 err = sock_sendmsg(sock, msg_sys, total_len);
1996 /*
1997 * If this is sendmmsg() and sending to current destination address was
1998 * successful, remember it.
1999 */
2000 if (used_address && err >= 0) {
2001 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002002 if (msg_sys->msg_name)
2003 memcpy(&used_address->name, msg_sys->msg_name,
2004 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002005 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006
2007out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002008 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2010out_freeiov:
2011 if (iov != iovstack)
2012 sock_kfree_s(sock->sk, iov, iov_size);
Anton Blanchard228e5482011-05-02 20:21:35 +00002013out:
2014 return err;
2015}
2016
2017/*
2018 * BSD sendmsg interface
2019 */
2020
2021SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags)
2022{
2023 int fput_needed, err;
2024 struct msghdr msg_sys;
2025 struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
2026
2027 if (!sock)
2028 goto out;
2029
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002030 err = __sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
Anton Blanchard228e5482011-05-02 20:21:35 +00002031
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002032 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002033out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034 return err;
2035}
2036
Anton Blanchard228e5482011-05-02 20:21:35 +00002037/*
2038 * Linux sendmmsg interface
2039 */
2040
2041int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2042 unsigned int flags)
2043{
2044 int fput_needed, err, datagrams;
2045 struct socket *sock;
2046 struct mmsghdr __user *entry;
2047 struct compat_mmsghdr __user *compat_entry;
2048 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002049 struct used_address used_address;
Anton Blanchard228e5482011-05-02 20:21:35 +00002050
Anton Blanchard98382f42011-08-04 14:07:39 +00002051 if (vlen > UIO_MAXIOV)
2052 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002053
2054 datagrams = 0;
2055
2056 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2057 if (!sock)
2058 return err;
2059
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002060 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002061 entry = mmsg;
2062 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002063 err = 0;
Anton Blanchard228e5482011-05-02 20:21:35 +00002064
2065 while (datagrams < vlen) {
Anton Blanchard228e5482011-05-02 20:21:35 +00002066 if (MSG_CMSG_COMPAT & flags) {
2067 err = __sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002068 &msg_sys, flags, &used_address);
Anton Blanchard228e5482011-05-02 20:21:35 +00002069 if (err < 0)
2070 break;
2071 err = __put_user(err, &compat_entry->msg_len);
2072 ++compat_entry;
2073 } else {
2074 err = __sys_sendmsg(sock, (struct msghdr __user *)entry,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002075 &msg_sys, flags, &used_address);
Anton Blanchard228e5482011-05-02 20:21:35 +00002076 if (err < 0)
2077 break;
2078 err = put_user(err, &entry->msg_len);
2079 ++entry;
2080 }
2081
2082 if (err)
2083 break;
2084 ++datagrams;
2085 }
2086
Anton Blanchard228e5482011-05-02 20:21:35 +00002087 fput_light(sock->file, fput_needed);
2088
Anton Blanchard728ffb82011-08-04 14:07:38 +00002089 /* We only return an error if no datagrams were able to be sent */
2090 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002091 return datagrams;
2092
Anton Blanchard228e5482011-05-02 20:21:35 +00002093 return err;
2094}
2095
2096SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2097 unsigned int, vlen, unsigned int, flags)
2098{
2099 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2100}
2101
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002102static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
2103 struct msghdr *msg_sys, unsigned flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002104{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002105 struct compat_msghdr __user *msg_compat =
2106 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002108 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109 unsigned long cmsg_ptr;
2110 int err, iov_size, total_len, len;
2111
2112 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002113 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114
2115 /* user mode address pointers */
2116 struct sockaddr __user *uaddr;
2117 int __user *uaddr_len;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002118
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119 if (MSG_CMSG_COMPAT & flags) {
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002120 if (get_compat_msghdr(msg_sys, msg_compat))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002121 return -EFAULT;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002122 } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002123 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124
Linus Torvalds1da177e2005-04-16 15:20:36 -07002125 err = -EMSGSIZE;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002126 if (msg_sys->msg_iovlen > UIO_MAXIOV)
2127 goto out;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002128
2129 /* Check whether to allocate the iovec area */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002130 err = -ENOMEM;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002131 iov_size = msg_sys->msg_iovlen * sizeof(struct iovec);
2132 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002133 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
2134 if (!iov)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002135 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002136 }
2137
2138 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002139 * Save the user-mode address (verify_iovec will change the
2140 * kernel msghdr to use the kernel address space)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002141 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002142
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002143 uaddr = (__force void __user *)msg_sys->msg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144 uaddr_len = COMPAT_NAMELEN(msg);
2145 if (MSG_CMSG_COMPAT & flags) {
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002146 err = verify_compat_iovec(msg_sys, iov,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002147 (struct sockaddr *)&addr,
2148 VERIFY_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149 } else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002150 err = verify_iovec(msg_sys, iov,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002151 (struct sockaddr *)&addr,
2152 VERIFY_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002153 if (err < 0)
2154 goto out_freeiov;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002155 total_len = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002156
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002157 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2158 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002159
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160 if (sock->file->f_flags & O_NONBLOCK)
2161 flags |= MSG_DONTWAIT;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002162 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
2163 total_len, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164 if (err < 0)
2165 goto out_freeiov;
2166 len = err;
2167
2168 if (uaddr != NULL) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002169 err = move_addr_to_user((struct sockaddr *)&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002170 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002171 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002172 if (err < 0)
2173 goto out_freeiov;
2174 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002175 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002176 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177 if (err)
2178 goto out_freeiov;
2179 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002180 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002181 &msg_compat->msg_controllen);
2182 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002183 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002184 &msg->msg_controllen);
2185 if (err)
2186 goto out_freeiov;
2187 err = len;
2188
2189out_freeiov:
2190 if (iov != iovstack)
2191 sock_kfree_s(sock->sk, iov, iov_size);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002192out:
2193 return err;
2194}
2195
2196/*
2197 * BSD recvmsg interface
2198 */
2199
2200SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
2201 unsigned int, flags)
2202{
2203 int fput_needed, err;
2204 struct msghdr msg_sys;
2205 struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
2206
2207 if (!sock)
2208 goto out;
2209
2210 err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2211
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002212 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002213out:
2214 return err;
2215}
2216
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002217/*
2218 * Linux recvmmsg interface
2219 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002220
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002221int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2222 unsigned int flags, struct timespec *timeout)
2223{
2224 int fput_needed, err, datagrams;
2225 struct socket *sock;
2226 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002227 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002228 struct msghdr msg_sys;
2229 struct timespec end_time;
2230
2231 if (timeout &&
2232 poll_select_set_timeout(&end_time, timeout->tv_sec,
2233 timeout->tv_nsec))
2234 return -EINVAL;
2235
2236 datagrams = 0;
2237
2238 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2239 if (!sock)
2240 return err;
2241
2242 err = sock_error(sock->sk);
2243 if (err)
2244 goto out_put;
2245
2246 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002247 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002248
2249 while (datagrams < vlen) {
2250 /*
2251 * No need to ask LSM for more than the first datagram.
2252 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002253 if (MSG_CMSG_COMPAT & flags) {
2254 err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
Anton Blanchardb9eb8b82011-05-17 15:38:57 -04002255 &msg_sys, flags & ~MSG_WAITFORONE,
2256 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002257 if (err < 0)
2258 break;
2259 err = __put_user(err, &compat_entry->msg_len);
2260 ++compat_entry;
2261 } else {
2262 err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
Anton Blanchardb9eb8b82011-05-17 15:38:57 -04002263 &msg_sys, flags & ~MSG_WAITFORONE,
2264 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002265 if (err < 0)
2266 break;
2267 err = put_user(err, &entry->msg_len);
2268 ++entry;
2269 }
2270
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002271 if (err)
2272 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002273 ++datagrams;
2274
Brandon L Black71c5c152010-03-26 16:18:03 +00002275 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2276 if (flags & MSG_WAITFORONE)
2277 flags |= MSG_DONTWAIT;
2278
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002279 if (timeout) {
2280 ktime_get_ts(timeout);
2281 *timeout = timespec_sub(end_time, *timeout);
2282 if (timeout->tv_sec < 0) {
2283 timeout->tv_sec = timeout->tv_nsec = 0;
2284 break;
2285 }
2286
2287 /* Timeout, return less than vlen datagrams */
2288 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2289 break;
2290 }
2291
2292 /* Out of band data, return right away */
2293 if (msg_sys.msg_flags & MSG_OOB)
2294 break;
2295 }
2296
2297out_put:
2298 fput_light(sock->file, fput_needed);
2299
2300 if (err == 0)
2301 return datagrams;
2302
2303 if (datagrams != 0) {
2304 /*
2305 * We may return less entries than requested (vlen) if the
2306 * sock is non block and there aren't enough datagrams...
2307 */
2308 if (err != -EAGAIN) {
2309 /*
2310 * ... or if recvmsg returns an error after we
2311 * received some datagrams, where we record the
2312 * error to return on the next call or if the
2313 * app asks about it using getsockopt(SO_ERROR).
2314 */
2315 sock->sk->sk_err = -err;
2316 }
2317
2318 return datagrams;
2319 }
2320
2321 return err;
2322}
2323
2324SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2325 unsigned int, vlen, unsigned int, flags,
2326 struct timespec __user *, timeout)
2327{
2328 int datagrams;
2329 struct timespec timeout_sys;
2330
2331 if (!timeout)
2332 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2333
2334 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2335 return -EFAULT;
2336
2337 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2338
2339 if (datagrams > 0 &&
2340 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2341 datagrams = -EFAULT;
2342
2343 return datagrams;
2344}
2345
2346#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002347/* Argument list sizes for sys_socketcall */
2348#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002349static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002350 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2351 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2352 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002353 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002354};
2355
Linus Torvalds1da177e2005-04-16 15:20:36 -07002356#undef AL
2357
2358/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002359 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360 *
2361 * Argument checking cleaned up. Saved 20% in size.
2362 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002363 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002364 */
2365
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002366SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002367{
2368 unsigned long a[6];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002369 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002370 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002371 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002372
Anton Blanchard228e5482011-05-02 20:21:35 +00002373 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002374 return -EINVAL;
2375
Arjan van de Ven47379052009-09-28 12:57:44 -07002376 len = nargs[call];
2377 if (len > sizeof(a))
2378 return -EINVAL;
2379
Linus Torvalds1da177e2005-04-16 15:20:36 -07002380 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002381 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002382 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002383
Al Virof3298dc2008-12-10 03:16:51 -05002384 audit_socketcall(nargs[call] / sizeof(unsigned long), a);
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002385
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002386 a0 = a[0];
2387 a1 = a[1];
2388
2389 switch (call) {
2390 case SYS_SOCKET:
2391 err = sys_socket(a0, a1, a[2]);
2392 break;
2393 case SYS_BIND:
2394 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2395 break;
2396 case SYS_CONNECT:
2397 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2398 break;
2399 case SYS_LISTEN:
2400 err = sys_listen(a0, a1);
2401 break;
2402 case SYS_ACCEPT:
Ulrich Drepperde11def2008-11-19 15:36:14 -08002403 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2404 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002405 break;
2406 case SYS_GETSOCKNAME:
2407 err =
2408 sys_getsockname(a0, (struct sockaddr __user *)a1,
2409 (int __user *)a[2]);
2410 break;
2411 case SYS_GETPEERNAME:
2412 err =
2413 sys_getpeername(a0, (struct sockaddr __user *)a1,
2414 (int __user *)a[2]);
2415 break;
2416 case SYS_SOCKETPAIR:
2417 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2418 break;
2419 case SYS_SEND:
2420 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2421 break;
2422 case SYS_SENDTO:
2423 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2424 (struct sockaddr __user *)a[4], a[5]);
2425 break;
2426 case SYS_RECV:
2427 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2428 break;
2429 case SYS_RECVFROM:
2430 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2431 (struct sockaddr __user *)a[4],
2432 (int __user *)a[5]);
2433 break;
2434 case SYS_SHUTDOWN:
2435 err = sys_shutdown(a0, a1);
2436 break;
2437 case SYS_SETSOCKOPT:
2438 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2439 break;
2440 case SYS_GETSOCKOPT:
2441 err =
2442 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2443 (int __user *)a[4]);
2444 break;
2445 case SYS_SENDMSG:
2446 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2447 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002448 case SYS_SENDMMSG:
2449 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2450 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002451 case SYS_RECVMSG:
2452 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2453 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002454 case SYS_RECVMMSG:
2455 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2456 (struct timespec __user *)a[4]);
2457 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002458 case SYS_ACCEPT4:
2459 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2460 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002461 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002462 default:
2463 err = -EINVAL;
2464 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002465 }
2466 return err;
2467}
2468
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002469#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002470
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002471/**
2472 * sock_register - add a socket protocol handler
2473 * @ops: description of protocol
2474 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002475 * This function is called by a protocol handler that wants to
2476 * advertise its address family, and have it linked into the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002477 * socket interface. The value ops->family coresponds to the
2478 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002479 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002480int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002481{
2482 int err;
2483
2484 if (ops->family >= NPROTO) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002485 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
2486 NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002487 return -ENOBUFS;
2488 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002489
2490 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002491 if (rcu_dereference_protected(net_families[ops->family],
2492 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002493 err = -EEXIST;
2494 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00002495 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002496 err = 0;
2497 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002498 spin_unlock(&net_family_lock);
2499
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002500 printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002501 return err;
2502}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002503EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002504
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002505/**
2506 * sock_unregister - remove a protocol handler
2507 * @family: protocol family to remove
2508 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002509 * This function is called by a protocol handler that wants to
2510 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002511 * new socket creation.
2512 *
2513 * If protocol handler is a module, then it can use module reference
2514 * counts to protect against new references. If protocol handler is not
2515 * a module then it needs to provide its own protection in
2516 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002517 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002518void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002519{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002520 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002521
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002522 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00002523 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002524 spin_unlock(&net_family_lock);
2525
2526 synchronize_rcu();
2527
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002528 printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002529}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002530EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002531
Andi Kleen77d76ea2005-12-22 12:43:42 -08002532static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002533{
Nick Pigginb3e19d92011-01-07 17:50:11 +11002534 int err;
2535
Linus Torvalds1da177e2005-04-16 15:20:36 -07002536 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002537 * Initialize sock SLAB cache.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002538 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002539
Linus Torvalds1da177e2005-04-16 15:20:36 -07002540 sk_init();
2541
Linus Torvalds1da177e2005-04-16 15:20:36 -07002542 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002543 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002544 */
2545 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002546
2547 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002548 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002549 */
2550
2551 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11002552
2553 err = register_filesystem(&sock_fs_type);
2554 if (err)
2555 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002556 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11002557 if (IS_ERR(sock_mnt)) {
2558 err = PTR_ERR(sock_mnt);
2559 goto out_mount;
2560 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08002561
2562 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563 */
2564
2565#ifdef CONFIG_NETFILTER
2566 netfilter_init();
2567#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002568
Richard Cochranc1f19b52010-07-17 08:49:36 +00002569#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
2570 skb_timestamping_init();
2571#endif
2572
Nick Pigginb3e19d92011-01-07 17:50:11 +11002573out:
2574 return err;
2575
2576out_mount:
2577 unregister_filesystem(&sock_fs_type);
2578out_fs:
2579 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002580}
2581
Andi Kleen77d76ea2005-12-22 12:43:42 -08002582core_initcall(sock_init); /* early initcall */
2583
Linus Torvalds1da177e2005-04-16 15:20:36 -07002584#ifdef CONFIG_PROC_FS
2585void socket_seq_show(struct seq_file *seq)
2586{
2587 int cpu;
2588 int counter = 0;
2589
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07002590 for_each_possible_cpu(cpu)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002591 counter += per_cpu(sockets_in_use, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002592
2593 /* It can be negative, by the way. 8) */
2594 if (counter < 0)
2595 counter = 0;
2596
2597 seq_printf(seq, "sockets: used %d\n", counter);
2598}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002599#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002600
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002601#ifdef CONFIG_COMPAT
Arnd Bergmann6b960182009-11-06 23:10:54 -08002602static int do_siocgstamp(struct net *net, struct socket *sock,
2603 unsigned int cmd, struct compat_timeval __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002604{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002605 mm_segment_t old_fs = get_fs();
2606 struct timeval ktv;
2607 int err;
2608
2609 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002610 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002611 set_fs(old_fs);
2612 if (!err) {
2613 err = put_user(ktv.tv_sec, &up->tv_sec);
2614 err |= __put_user(ktv.tv_usec, &up->tv_usec);
2615 }
2616 return err;
2617}
2618
Arnd Bergmann6b960182009-11-06 23:10:54 -08002619static int do_siocgstampns(struct net *net, struct socket *sock,
2620 unsigned int cmd, struct compat_timespec __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002621{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002622 mm_segment_t old_fs = get_fs();
2623 struct timespec kts;
2624 int err;
2625
2626 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002627 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002628 set_fs(old_fs);
2629 if (!err) {
2630 err = put_user(kts.tv_sec, &up->tv_sec);
2631 err |= __put_user(kts.tv_nsec, &up->tv_nsec);
2632 }
2633 return err;
2634}
2635
Arnd Bergmann6b960182009-11-06 23:10:54 -08002636static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002637{
2638 struct ifreq __user *uifr;
2639 int err;
2640
2641 uifr = compat_alloc_user_space(sizeof(struct ifreq));
Arnd Bergmann6b960182009-11-06 23:10:54 -08002642 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002643 return -EFAULT;
2644
Arnd Bergmann6b960182009-11-06 23:10:54 -08002645 err = dev_ioctl(net, SIOCGIFNAME, uifr);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002646 if (err)
2647 return err;
2648
Arnd Bergmann6b960182009-11-06 23:10:54 -08002649 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002650 return -EFAULT;
2651
2652 return 0;
2653}
2654
Arnd Bergmann6b960182009-11-06 23:10:54 -08002655static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002656{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002657 struct compat_ifconf ifc32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002658 struct ifconf ifc;
2659 struct ifconf __user *uifc;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002660 struct compat_ifreq __user *ifr32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002661 struct ifreq __user *ifr;
2662 unsigned int i, j;
2663 int err;
2664
Arnd Bergmann6b960182009-11-06 23:10:54 -08002665 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002666 return -EFAULT;
2667
2668 if (ifc32.ifcbuf == 0) {
2669 ifc32.ifc_len = 0;
2670 ifc.ifc_len = 0;
2671 ifc.ifc_req = NULL;
2672 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2673 } else {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002674 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2675 sizeof(struct ifreq);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002676 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2677 ifc.ifc_len = len;
2678 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2679 ifr32 = compat_ptr(ifc32.ifcbuf);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002680 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
Arnd Bergmann6b960182009-11-06 23:10:54 -08002681 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002682 return -EFAULT;
2683 ifr++;
2684 ifr32++;
2685 }
2686 }
2687 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2688 return -EFAULT;
2689
Arnd Bergmann6b960182009-11-06 23:10:54 -08002690 err = dev_ioctl(net, SIOCGIFCONF, uifc);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002691 if (err)
2692 return err;
2693
2694 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2695 return -EFAULT;
2696
2697 ifr = ifc.ifc_req;
2698 ifr32 = compat_ptr(ifc32.ifcbuf);
2699 for (i = 0, j = 0;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002700 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2701 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2702 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002703 return -EFAULT;
2704 ifr32++;
2705 ifr++;
2706 }
2707
2708 if (ifc32.ifcbuf == 0) {
2709 /* Translate from 64-bit structure multiple to
2710 * a 32-bit one.
2711 */
2712 i = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002713 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
Arnd Bergmann7a229382009-11-06 23:00:29 -08002714 ifc32.ifc_len = i;
2715 } else {
2716 ifc32.ifc_len = i;
2717 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08002718 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002719 return -EFAULT;
2720
2721 return 0;
2722}
2723
Arnd Bergmann6b960182009-11-06 23:10:54 -08002724static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002725{
Ben Hutchings3a7da392011-03-17 07:34:32 +00002726 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2727 bool convert_in = false, convert_out = false;
2728 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2729 struct ethtool_rxnfc __user *rxnfc;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002730 struct ifreq __user *ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002731 u32 rule_cnt = 0, actual_rule_cnt;
2732 u32 ethcmd;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002733 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002734 int ret;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002735
2736 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2737 return -EFAULT;
2738
Ben Hutchings3a7da392011-03-17 07:34:32 +00002739 compat_rxnfc = compat_ptr(data);
2740
2741 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002742 return -EFAULT;
2743
Ben Hutchings3a7da392011-03-17 07:34:32 +00002744 /* Most ethtool structures are defined without padding.
2745 * Unfortunately struct ethtool_rxnfc is an exception.
2746 */
2747 switch (ethcmd) {
2748 default:
2749 break;
2750 case ETHTOOL_GRXCLSRLALL:
2751 /* Buffer size is variable */
2752 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2753 return -EFAULT;
2754 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2755 return -ENOMEM;
2756 buf_size += rule_cnt * sizeof(u32);
2757 /* fall through */
2758 case ETHTOOL_GRXRINGS:
2759 case ETHTOOL_GRXCLSRLCNT:
2760 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00002761 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002762 convert_out = true;
2763 /* fall through */
2764 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002765 buf_size += sizeof(struct ethtool_rxnfc);
2766 convert_in = true;
2767 break;
2768 }
2769
2770 ifr = compat_alloc_user_space(buf_size);
2771 rxnfc = (void *)ifr + ALIGN(sizeof(struct ifreq), 8);
2772
2773 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2774 return -EFAULT;
2775
2776 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2777 &ifr->ifr_ifru.ifru_data))
2778 return -EFAULT;
2779
2780 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00002781 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00002782 * fs.ring_cookie and at the end of fs, but nowhere else.
2783 */
Alexander Duyck127fe532011-04-08 18:01:59 +00002784 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2785 sizeof(compat_rxnfc->fs.m_ext) !=
2786 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2787 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00002788 BUILD_BUG_ON(
2789 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2790 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2791 offsetof(struct ethtool_rxnfc, fs.location) -
2792 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2793
2794 if (copy_in_user(rxnfc, compat_rxnfc,
Alexander Duyck127fe532011-04-08 18:01:59 +00002795 (void *)(&rxnfc->fs.m_ext + 1) -
Ben Hutchings3a7da392011-03-17 07:34:32 +00002796 (void *)rxnfc) ||
2797 copy_in_user(&rxnfc->fs.ring_cookie,
2798 &compat_rxnfc->fs.ring_cookie,
2799 (void *)(&rxnfc->fs.location + 1) -
2800 (void *)&rxnfc->fs.ring_cookie) ||
2801 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2802 sizeof(rxnfc->rule_cnt)))
2803 return -EFAULT;
2804 }
2805
2806 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2807 if (ret)
2808 return ret;
2809
2810 if (convert_out) {
2811 if (copy_in_user(compat_rxnfc, rxnfc,
Alexander Duyck127fe532011-04-08 18:01:59 +00002812 (const void *)(&rxnfc->fs.m_ext + 1) -
Ben Hutchings3a7da392011-03-17 07:34:32 +00002813 (const void *)rxnfc) ||
2814 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2815 &rxnfc->fs.ring_cookie,
2816 (const void *)(&rxnfc->fs.location + 1) -
2817 (const void *)&rxnfc->fs.ring_cookie) ||
2818 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2819 sizeof(rxnfc->rule_cnt)))
2820 return -EFAULT;
2821
2822 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2823 /* As an optimisation, we only copy the actual
2824 * number of rules that the underlying
2825 * function returned. Since Mallory might
2826 * change the rule count in user memory, we
2827 * check that it is less than the rule count
2828 * originally given (as the user buffer size),
2829 * which has been range-checked.
2830 */
2831 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2832 return -EFAULT;
2833 if (actual_rule_cnt < rule_cnt)
2834 rule_cnt = actual_rule_cnt;
2835 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2836 &rxnfc->rule_locs[0],
2837 rule_cnt * sizeof(u32)))
2838 return -EFAULT;
2839 }
2840 }
2841
2842 return 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002843}
2844
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002845static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2846{
2847 void __user *uptr;
2848 compat_uptr_t uptr32;
2849 struct ifreq __user *uifr;
2850
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002851 uifr = compat_alloc_user_space(sizeof(*uifr));
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002852 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2853 return -EFAULT;
2854
2855 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2856 return -EFAULT;
2857
2858 uptr = compat_ptr(uptr32);
2859
2860 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2861 return -EFAULT;
2862
2863 return dev_ioctl(net, SIOCWANDEV, uifr);
2864}
2865
Arnd Bergmann6b960182009-11-06 23:10:54 -08002866static int bond_ioctl(struct net *net, unsigned int cmd,
2867 struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002868{
2869 struct ifreq kifr;
2870 struct ifreq __user *uifr;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002871 mm_segment_t old_fs;
2872 int err;
2873 u32 data;
2874 void __user *datap;
2875
2876 switch (cmd) {
2877 case SIOCBONDENSLAVE:
2878 case SIOCBONDRELEASE:
2879 case SIOCBONDSETHWADDR:
2880 case SIOCBONDCHANGEACTIVE:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002881 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002882 return -EFAULT;
2883
2884 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002885 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002886 err = dev_ioctl(net, cmd,
2887 (struct ifreq __user __force *) &kifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002888 set_fs(old_fs);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002889
2890 return err;
2891 case SIOCBONDSLAVEINFOQUERY:
2892 case SIOCBONDINFOQUERY:
2893 uifr = compat_alloc_user_space(sizeof(*uifr));
2894 if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2895 return -EFAULT;
2896
2897 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2898 return -EFAULT;
2899
2900 datap = compat_ptr(data);
2901 if (put_user(datap, &uifr->ifr_ifru.ifru_data))
2902 return -EFAULT;
2903
Arnd Bergmann6b960182009-11-06 23:10:54 -08002904 return dev_ioctl(net, cmd, uifr);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002905 default:
Linus Torvalds07d106d2012-01-05 15:40:12 -08002906 return -ENOIOCTLCMD;
Joe Perchesccbd6a52010-05-14 10:58:26 +00002907 }
Arnd Bergmann7a229382009-11-06 23:00:29 -08002908}
2909
Arnd Bergmann6b960182009-11-06 23:10:54 -08002910static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
2911 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002912{
2913 struct ifreq __user *u_ifreq64;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002914 char tmp_buf[IFNAMSIZ];
2915 void __user *data64;
2916 u32 data32;
2917
2918 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
2919 IFNAMSIZ))
2920 return -EFAULT;
2921 if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
2922 return -EFAULT;
2923 data64 = compat_ptr(data32);
2924
2925 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
2926
2927 /* Don't check these user accesses, just let that get trapped
2928 * in the ioctl handler instead.
2929 */
2930 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
2931 IFNAMSIZ))
2932 return -EFAULT;
2933 if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
2934 return -EFAULT;
2935
Arnd Bergmann6b960182009-11-06 23:10:54 -08002936 return dev_ioctl(net, cmd, u_ifreq64);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002937}
2938
Arnd Bergmann6b960182009-11-06 23:10:54 -08002939static int dev_ifsioc(struct net *net, struct socket *sock,
2940 unsigned int cmd, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002941{
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002942 struct ifreq __user *uifr;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002943 int err;
2944
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002945 uifr = compat_alloc_user_space(sizeof(*uifr));
2946 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
2947 return -EFAULT;
2948
2949 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
2950
Arnd Bergmann7a229382009-11-06 23:00:29 -08002951 if (!err) {
2952 switch (cmd) {
2953 case SIOCGIFFLAGS:
2954 case SIOCGIFMETRIC:
2955 case SIOCGIFMTU:
2956 case SIOCGIFMEM:
2957 case SIOCGIFHWADDR:
2958 case SIOCGIFINDEX:
2959 case SIOCGIFADDR:
2960 case SIOCGIFBRDADDR:
2961 case SIOCGIFDSTADDR:
2962 case SIOCGIFNETMASK:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002963 case SIOCGIFPFLAGS:
Arnd Bergmann7a229382009-11-06 23:00:29 -08002964 case SIOCGIFTXQLEN:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002965 case SIOCGMIIPHY:
2966 case SIOCGMIIREG:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002967 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002968 err = -EFAULT;
2969 break;
2970 }
2971 }
2972 return err;
2973}
2974
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002975static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2976 struct compat_ifreq __user *uifr32)
2977{
2978 struct ifreq ifr;
2979 struct compat_ifmap __user *uifmap32;
2980 mm_segment_t old_fs;
2981 int err;
2982
2983 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2984 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
2985 err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2986 err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2987 err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2988 err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq);
2989 err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma);
2990 err |= __get_user(ifr.ifr_map.port, &uifmap32->port);
2991 if (err)
2992 return -EFAULT;
2993
2994 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002995 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002996 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002997 set_fs(old_fs);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002998
2999 if (cmd == SIOCGIFMAP && !err) {
3000 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
3001 err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3002 err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3003 err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3004 err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq);
3005 err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma);
3006 err |= __put_user(ifr.ifr_map.port, &uifmap32->port);
3007 if (err)
3008 err = -EFAULT;
3009 }
3010 return err;
3011}
3012
3013static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32)
3014{
3015 void __user *uptr;
3016 compat_uptr_t uptr32;
3017 struct ifreq __user *uifr;
3018
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003019 uifr = compat_alloc_user_space(sizeof(*uifr));
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003020 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
3021 return -EFAULT;
3022
3023 if (get_user(uptr32, &uifr32->ifr_data))
3024 return -EFAULT;
3025
3026 uptr = compat_ptr(uptr32);
3027
3028 if (put_user(uptr, &uifr->ifr_data))
3029 return -EFAULT;
3030
3031 return dev_ioctl(net, SIOCSHWTSTAMP, uifr);
3032}
3033
Arnd Bergmann7a229382009-11-06 23:00:29 -08003034struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003035 u32 rt_pad1;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003036 struct sockaddr rt_dst; /* target address */
3037 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3038 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003039 unsigned short rt_flags;
3040 short rt_pad2;
3041 u32 rt_pad3;
3042 unsigned char rt_tos;
3043 unsigned char rt_class;
3044 short rt_pad4;
3045 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003046 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003047 u32 rt_mtu; /* per route MTU/Window */
3048 u32 rt_window; /* Window clamping */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003049 unsigned short rt_irtt; /* Initial RTT */
3050};
3051
3052struct in6_rtmsg32 {
3053 struct in6_addr rtmsg_dst;
3054 struct in6_addr rtmsg_src;
3055 struct in6_addr rtmsg_gateway;
3056 u32 rtmsg_type;
3057 u16 rtmsg_dst_len;
3058 u16 rtmsg_src_len;
3059 u32 rtmsg_metric;
3060 u32 rtmsg_info;
3061 u32 rtmsg_flags;
3062 s32 rtmsg_ifindex;
3063};
3064
Arnd Bergmann6b960182009-11-06 23:10:54 -08003065static int routing_ioctl(struct net *net, struct socket *sock,
3066 unsigned int cmd, void __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003067{
3068 int ret;
3069 void *r = NULL;
3070 struct in6_rtmsg r6;
3071 struct rtentry r4;
3072 char devname[16];
3073 u32 rtdev;
3074 mm_segment_t old_fs = get_fs();
3075
Arnd Bergmann6b960182009-11-06 23:10:54 -08003076 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3077 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003078 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003079 3 * sizeof(struct in6_addr));
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003080 ret |= __get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3081 ret |= __get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3082 ret |= __get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3083 ret |= __get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3084 ret |= __get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3085 ret |= __get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3086 ret |= __get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003087
3088 r = (void *) &r6;
3089 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003090 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003091 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003092 3 * sizeof(struct sockaddr));
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003093 ret |= __get_user(r4.rt_flags, &(ur4->rt_flags));
3094 ret |= __get_user(r4.rt_metric, &(ur4->rt_metric));
3095 ret |= __get_user(r4.rt_mtu, &(ur4->rt_mtu));
3096 ret |= __get_user(r4.rt_window, &(ur4->rt_window));
3097 ret |= __get_user(r4.rt_irtt, &(ur4->rt_irtt));
3098 ret |= __get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003099 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003100 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003101 r4.rt_dev = (char __user __force *)devname;
3102 devname[15] = 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003103 } else
3104 r4.rt_dev = NULL;
3105
3106 r = (void *) &r4;
3107 }
3108
3109 if (ret) {
3110 ret = -EFAULT;
3111 goto out;
3112 }
3113
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003114 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003115 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003116 set_fs(old_fs);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003117
3118out:
Arnd Bergmann7a229382009-11-06 23:00:29 -08003119 return ret;
3120}
3121
3122/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3123 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003124 * use compatible ioctls
Arnd Bergmann7a229382009-11-06 23:00:29 -08003125 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003126static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003127{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003128 compat_ulong_t tmp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003129
Arnd Bergmann6b960182009-11-06 23:10:54 -08003130 if (get_user(tmp, argp))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003131 return -EFAULT;
3132 if (tmp == BRCTL_GET_VERSION)
3133 return BRCTL_VERSION + 1;
3134 return -EINVAL;
3135}
3136
Arnd Bergmann6b960182009-11-06 23:10:54 -08003137static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3138 unsigned int cmd, unsigned long arg)
3139{
3140 void __user *argp = compat_ptr(arg);
3141 struct sock *sk = sock->sk;
3142 struct net *net = sock_net(sk);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003143
Arnd Bergmann6b960182009-11-06 23:10:54 -08003144 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3145 return siocdevprivate_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003146
Arnd Bergmann6b960182009-11-06 23:10:54 -08003147 switch (cmd) {
3148 case SIOCSIFBR:
3149 case SIOCGIFBR:
3150 return old_bridge_ioctl(argp);
3151 case SIOCGIFNAME:
3152 return dev_ifname32(net, argp);
3153 case SIOCGIFCONF:
3154 return dev_ifconf(net, argp);
3155 case SIOCETHTOOL:
3156 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003157 case SIOCWANDEV:
3158 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003159 case SIOCGIFMAP:
3160 case SIOCSIFMAP:
3161 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003162 case SIOCBONDENSLAVE:
3163 case SIOCBONDRELEASE:
3164 case SIOCBONDSETHWADDR:
3165 case SIOCBONDSLAVEINFOQUERY:
3166 case SIOCBONDINFOQUERY:
3167 case SIOCBONDCHANGEACTIVE:
3168 return bond_ioctl(net, cmd, argp);
3169 case SIOCADDRT:
3170 case SIOCDELRT:
3171 return routing_ioctl(net, sock, cmd, argp);
3172 case SIOCGSTAMP:
3173 return do_siocgstamp(net, sock, cmd, argp);
3174 case SIOCGSTAMPNS:
3175 return do_siocgstampns(net, sock, cmd, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003176 case SIOCSHWTSTAMP:
3177 return compat_siocshwtstamp(net, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003178
Arnd Bergmann6b960182009-11-06 23:10:54 -08003179 case FIOSETOWN:
3180 case SIOCSPGRP:
3181 case FIOGETOWN:
3182 case SIOCGPGRP:
3183 case SIOCBRADDBR:
3184 case SIOCBRDELBR:
3185 case SIOCGIFVLAN:
3186 case SIOCSIFVLAN:
3187 case SIOCADDDLCI:
3188 case SIOCDELDLCI:
3189 return sock_ioctl(file, cmd, arg);
3190
3191 case SIOCGIFFLAGS:
3192 case SIOCSIFFLAGS:
3193 case SIOCGIFMETRIC:
3194 case SIOCSIFMETRIC:
3195 case SIOCGIFMTU:
3196 case SIOCSIFMTU:
3197 case SIOCGIFMEM:
3198 case SIOCSIFMEM:
3199 case SIOCGIFHWADDR:
3200 case SIOCSIFHWADDR:
3201 case SIOCADDMULTI:
3202 case SIOCDELMULTI:
3203 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003204 case SIOCGIFADDR:
3205 case SIOCSIFADDR:
3206 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003207 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003208 case SIOCGIFBRDADDR:
3209 case SIOCSIFBRDADDR:
3210 case SIOCGIFDSTADDR:
3211 case SIOCSIFDSTADDR:
3212 case SIOCGIFNETMASK:
3213 case SIOCSIFNETMASK:
3214 case SIOCSIFPFLAGS:
3215 case SIOCGIFPFLAGS:
3216 case SIOCGIFTXQLEN:
3217 case SIOCSIFTXQLEN:
3218 case SIOCBRADDIF:
3219 case SIOCBRDELIF:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003220 case SIOCSIFNAME:
3221 case SIOCGMIIPHY:
3222 case SIOCGMIIREG:
3223 case SIOCSMIIREG:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003224 return dev_ifsioc(net, sock, cmd, argp);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003225
Arnd Bergmann6b960182009-11-06 23:10:54 -08003226 case SIOCSARP:
3227 case SIOCGARP:
3228 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003229 case SIOCATMARK:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003230 return sock_do_ioctl(net, sock, cmd, arg);
3231 }
3232
Arnd Bergmann6b960182009-11-06 23:10:54 -08003233 return -ENOIOCTLCMD;
3234}
Arnd Bergmann7a229382009-11-06 23:00:29 -08003235
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003236static long compat_sock_ioctl(struct file *file, unsigned cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003237 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003238{
3239 struct socket *sock = file->private_data;
3240 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003241 struct sock *sk;
3242 struct net *net;
3243
3244 sk = sock->sk;
3245 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003246
3247 if (sock->ops->compat_ioctl)
3248 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3249
David S. Miller87de87d2008-06-03 09:14:03 -07003250 if (ret == -ENOIOCTLCMD &&
3251 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3252 ret = compat_wext_handle_ioctl(net, cmd, arg);
3253
Arnd Bergmann6b960182009-11-06 23:10:54 -08003254 if (ret == -ENOIOCTLCMD)
3255 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3256
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003257 return ret;
3258}
3259#endif
3260
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003261int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3262{
3263 return sock->ops->bind(sock, addr, addrlen);
3264}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003265EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003266
3267int kernel_listen(struct socket *sock, int backlog)
3268{
3269 return sock->ops->listen(sock, backlog);
3270}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003271EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003272
3273int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3274{
3275 struct sock *sk = sock->sk;
3276 int err;
3277
3278 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3279 newsock);
3280 if (err < 0)
3281 goto done;
3282
3283 err = sock->ops->accept(sock, *newsock, flags);
3284 if (err < 0) {
3285 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003286 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003287 goto done;
3288 }
3289
3290 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003291 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003292
3293done:
3294 return err;
3295}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003296EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003297
3298int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003299 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003300{
3301 return sock->ops->connect(sock, addr, addrlen, flags);
3302}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003303EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003304
3305int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3306 int *addrlen)
3307{
3308 return sock->ops->getname(sock, addr, addrlen, 0);
3309}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003310EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003311
3312int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3313 int *addrlen)
3314{
3315 return sock->ops->getname(sock, addr, addrlen, 1);
3316}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003317EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003318
3319int kernel_getsockopt(struct socket *sock, int level, int optname,
3320 char *optval, int *optlen)
3321{
3322 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003323 char __user *uoptval;
3324 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003325 int err;
3326
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003327 uoptval = (char __user __force *) optval;
3328 uoptlen = (int __user __force *) optlen;
3329
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003330 set_fs(KERNEL_DS);
3331 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003332 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003333 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003334 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3335 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003336 set_fs(oldfs);
3337 return err;
3338}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003339EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003340
3341int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003342 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003343{
3344 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003345 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003346 int err;
3347
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003348 uoptval = (char __user __force *) optval;
3349
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003350 set_fs(KERNEL_DS);
3351 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003352 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003353 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003354 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003355 optlen);
3356 set_fs(oldfs);
3357 return err;
3358}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003359EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003360
3361int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3362 size_t size, int flags)
3363{
Herbert Xuf8451722010-05-24 00:12:34 -07003364 sock_update_classid(sock->sk);
3365
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003366 if (sock->ops->sendpage)
3367 return sock->ops->sendpage(sock, page, offset, size, flags);
3368
3369 return sock_no_sendpage(sock, page, offset, size, flags);
3370}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003371EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003372
3373int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3374{
3375 mm_segment_t oldfs = get_fs();
3376 int err;
3377
3378 set_fs(KERNEL_DS);
3379 err = sock->ops->ioctl(sock, cmd, arg);
3380 set_fs(oldfs);
3381
3382 return err;
3383}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003384EXPORT_SYMBOL(kernel_sock_ioctl);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003385
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003386int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3387{
3388 return sock->ops->shutdown(sock, how);
3389}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003390EXPORT_SYMBOL(kernel_sock_shutdown);