blob: 3a2778d71631d4991cee7016e661e76901b41ab2 [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/if_bridge.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030073#include <linux/if_frad.h>
74#include <linux/if_vlan.h>
Daniel Borkmann408eccc2014-04-01 16:20:23 +020075#include <linux/ptp_classify.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>
Masatake YAMATO600e1772012-08-29 10:44:29 +000091#include <linux/xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93#include <asm/uaccess.h>
94#include <asm/unistd.h>
95
96#include <net/compat.h>
David S. Miller87de87d2008-06-03 09:14:03 -070097#include <net/wext.h>
Herbert Xuf8451722010-05-24 00:12:34 -070098#include <net/cls_cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100#include <net/sock.h>
101#include <linux/netfilter.h>
102
Arnd Bergmann6b960182009-11-06 23:10:54 -0800103#include <linux/if_tun.h>
104#include <linux/ipv6_route.h>
105#include <linux/route.h>
Arnd Bergmann6b960182009-11-06 23:10:54 -0800106#include <linux/sockios.h>
107#include <linux/atalk.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +0300108#include <net/busy_poll.h>
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400109#include <linux/errqueue.h>
Eliezer Tamir06021292013-06-10 11:39:50 +0300110
Cong Wange0d10952013-08-01 11:10:25 +0800111#ifdef CONFIG_NET_RX_BUSY_POLL
Eliezer Tamir64b0dc52013-07-10 17:13:36 +0300112unsigned int sysctl_net_busy_read __read_mostly;
113unsigned int sysctl_net_busy_poll __read_mostly;
Eliezer Tamir06021292013-06-10 11:39:50 +0300114#endif
Arnd Bergmann6b960182009-11-06 23:10:54 -0800115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
Badari Pulavarty027445c2006-09-30 23:28:46 -0700117static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
118 unsigned long nr_segs, loff_t pos);
119static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
120 unsigned long nr_segs, loff_t pos);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700121static int sock_mmap(struct file *file, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123static int sock_close(struct inode *inode, struct file *file);
124static unsigned int sock_poll(struct file *file,
125 struct poll_table_struct *wait);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700126static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800127#ifdef CONFIG_COMPAT
128static long compat_sock_ioctl(struct file *file,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700129 unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800130#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131static int sock_fasync(int fd, struct file *filp, int on);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132static ssize_t sock_sendpage(struct file *file, struct page *page,
133 int offset, size_t size, loff_t *ppos, int more);
Jens Axboe9c55e012007-11-06 23:30:13 -0800134static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700135 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800136 unsigned int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138/*
139 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
140 * in the operation structures but are done directly via the socketcall() multiplexor.
141 */
142
Arjan van de Venda7071d2007-02-12 00:55:36 -0800143static const struct file_operations socket_file_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 .owner = THIS_MODULE,
145 .llseek = no_llseek,
146 .aio_read = sock_aio_read,
147 .aio_write = sock_aio_write,
148 .poll = sock_poll,
149 .unlocked_ioctl = sock_ioctl,
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800150#ifdef CONFIG_COMPAT
151 .compat_ioctl = compat_sock_ioctl,
152#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 .mmap = sock_mmap,
154 .open = sock_no_open, /* special open code to disallow open via /proc */
155 .release = sock_close,
156 .fasync = sock_fasync,
Jens Axboe5274f052006-03-30 15:15:30 +0200157 .sendpage = sock_sendpage,
158 .splice_write = generic_splice_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800159 .splice_read = sock_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160};
161
162/*
163 * The protocol list. Each protocol is registered in here.
164 */
165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166static DEFINE_SPINLOCK(net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +0000167static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169/*
170 * Statistics counters of the socket lists
171 */
172
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700173static DEFINE_PER_CPU(int, sockets_in_use);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
175/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700176 * Support routines.
177 * Move socket addresses back and forth across the kernel/user
178 * divide and look after the messy bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 */
180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181/**
182 * move_addr_to_kernel - copy a socket address into kernel space
183 * @uaddr: Address in user space
184 * @kaddr: Address in kernel space
185 * @ulen: Length in user space
186 *
187 * The address is copied into kernel space. If the provided address is
188 * too long an error code of -EINVAL is returned. If the copy gives
189 * invalid addresses -EFAULT is returned. On a success 0 is returned.
190 */
191
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000192int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700194 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700196 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700198 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100200 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
202
203/**
204 * move_addr_to_user - copy an address to user space
205 * @kaddr: kernel space address
206 * @klen: length of address in kernel
207 * @uaddr: user space address
208 * @ulen: pointer to user length field
209 *
210 * The value pointed to by ulen on entry is the buffer length available.
211 * This is overwritten with the buffer space used. -EINVAL is returned
212 * if an overlong buffer is specified or a negative buffer size. -EFAULT
213 * is returned if either the buffer or the length field are not
214 * accessible.
215 * After copying the data up to the limit the user specifies, the true
216 * length of the data is written over the length limit the user
217 * specified. Zero is returned for a success.
218 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700219
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000220static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
stephen hemminger11165f12010-10-18 14:27:29 +0000221 void __user *uaddr, int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
223 int err;
224 int len;
225
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100226 BUG_ON(klen > sizeof(struct sockaddr_storage));
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700227 err = get_user(len, ulen);
228 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700230 if (len > klen)
231 len = klen;
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100232 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700234 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500235 if (audit_sockaddr(klen, kaddr))
236 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700237 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 return -EFAULT;
239 }
240 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700241 * "fromlen shall refer to the value before truncation.."
242 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 */
244 return __put_user(klen, ulen);
245}
246
Christoph Lametere18b8902006-12-06 20:33:20 -0800247static struct kmem_cache *sock_inode_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249static struct inode *sock_alloc_inode(struct super_block *sb)
250{
251 struct socket_alloc *ei;
Eric Dumazeteaefd1102011-02-18 03:26:36 +0000252 struct socket_wq *wq;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700253
Christoph Lametere94b1762006-12-06 20:33:17 -0800254 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 if (!ei)
256 return NULL;
Eric Dumazeteaefd1102011-02-18 03:26:36 +0000257 wq = kmalloc(sizeof(*wq), GFP_KERNEL);
258 if (!wq) {
Eric Dumazet43815482010-04-29 11:01:49 +0000259 kmem_cache_free(sock_inode_cachep, ei);
260 return NULL;
261 }
Eric Dumazeteaefd1102011-02-18 03:26:36 +0000262 init_waitqueue_head(&wq->wait);
263 wq->fasync_list = NULL;
264 RCU_INIT_POINTER(ei->socket.wq, wq);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700265
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 ei->socket.state = SS_UNCONNECTED;
267 ei->socket.flags = 0;
268 ei->socket.ops = NULL;
269 ei->socket.sk = NULL;
270 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272 return &ei->vfs_inode;
273}
274
275static void sock_destroy_inode(struct inode *inode)
276{
Eric Dumazet43815482010-04-29 11:01:49 +0000277 struct socket_alloc *ei;
Eric Dumazeteaefd1102011-02-18 03:26:36 +0000278 struct socket_wq *wq;
Eric Dumazet43815482010-04-29 11:01:49 +0000279
280 ei = container_of(inode, struct socket_alloc, vfs_inode);
Eric Dumazeteaefd1102011-02-18 03:26:36 +0000281 wq = rcu_dereference_protected(ei->socket.wq, 1);
Lai Jiangshan61845222011-03-18 12:10:25 +0800282 kfree_rcu(wq, rcu);
Eric Dumazet43815482010-04-29 11:01:49 +0000283 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284}
285
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700286static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700288 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Christoph Lametera35afb82007-05-16 22:10:57 -0700290 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293static int init_inodecache(void)
294{
295 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700296 sizeof(struct socket_alloc),
297 0,
298 (SLAB_HWCACHE_ALIGN |
299 SLAB_RECLAIM_ACCOUNT |
300 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900301 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 if (sock_inode_cachep == NULL)
303 return -ENOMEM;
304 return 0;
305}
306
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700307static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700308 .alloc_inode = sock_alloc_inode,
309 .destroy_inode = sock_destroy_inode,
310 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311};
312
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700313/*
314 * sockfs_dname() is called from d_path().
315 */
316static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
317{
318 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
319 dentry->d_inode->i_ino);
320}
321
Al Viro3ba13d12009-02-20 06:02:22 +0000322static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700323 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324};
325
Al Viroc74a1cb2011-01-12 16:59:34 -0500326static struct dentry *sockfs_mount(struct file_system_type *fs_type,
327 int flags, const char *dev_name, void *data)
328{
329 return mount_pseudo(fs_type, "socket:", &sockfs_ops,
330 &sockfs_dentry_operations, SOCKFS_MAGIC);
331}
332
333static struct vfsmount *sock_mnt __read_mostly;
334
335static struct file_system_type sock_fs_type = {
336 .name = "sockfs",
337 .mount = sockfs_mount,
338 .kill_sb = kill_anon_super,
339};
340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341/*
342 * Obtains the first available file descriptor and sets it up for use.
343 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800344 * These functions create file structures and maps them to fd space
345 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 * and file struct implicitly stored in sock->file.
347 * Note that another thread may close file descriptor before we return
348 * from this function. We use the fact that now we do not refer
349 * to socket after mapping. If one day we will need it, this
350 * function will increment ref. count on file by 1.
351 *
352 * In any case returned fd MAY BE not valid!
353 * This race condition is unavoidable
354 * with shared fd spaces, we cannot solve it inside kernel,
355 * but we take care of internal coherence yet.
356 */
357
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700358struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359{
Al Viro7cbe66b2009-08-05 19:59:08 +0400360 struct qstr name = { .name = "" };
Al Viro2c48b9c2009-08-09 00:52:35 +0400361 struct path path;
Al Viro7cbe66b2009-08-05 19:59:08 +0400362 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800363
Masatake YAMATO600e1772012-08-29 10:44:29 +0000364 if (dname) {
365 name.name = dname;
366 name.len = strlen(name.name);
367 } else if (sock->sk) {
368 name.name = sock->sk->sk_prot_creator->name;
369 name.len = strlen(name.name);
370 }
Nick Piggin4b936882011-01-07 17:50:07 +1100371 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
Al Viro28407632012-08-17 23:54:15 -0400372 if (unlikely(!path.dentry))
373 return ERR_PTR(-ENOMEM);
Al Viro2c48b9c2009-08-09 00:52:35 +0400374 path.mnt = mntget(sock_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
Al Viro2c48b9c2009-08-09 00:52:35 +0400376 d_instantiate(path.dentry, SOCK_INODE(sock));
Al Virocc3808f2009-08-06 09:43:59 +0400377 SOCK_INODE(sock)->i_fop = &socket_file_ops;
378
Al Viro2c48b9c2009-08-09 00:52:35 +0400379 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
Al Virocc3808f2009-08-06 09:43:59 +0400380 &socket_file_ops);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700381 if (unlikely(IS_ERR(file))) {
Al Virocc3808f2009-08-06 09:43:59 +0400382 /* drop dentry, keep inode */
Al Viro7de9c6ee2010-10-23 11:11:40 -0400383 ihold(path.dentry->d_inode);
Al Viro2c48b9c2009-08-09 00:52:35 +0400384 path_put(&path);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700385 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400386 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800387
388 sock->file = file;
Ulrich Drepper77d27202008-07-23 21:29:35 -0700389 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800390 file->private_data = sock;
Al Viro28407632012-08-17 23:54:15 -0400391 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800392}
Al Viro56b31d12012-08-18 00:25:51 -0400393EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800394
Al Viro56b31d12012-08-18 00:25:51 -0400395static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800396{
397 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400398 int fd = get_unused_fd_flags(flags);
399 if (unlikely(fd < 0))
400 return fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800401
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700402 newfile = sock_alloc_file(sock, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -0400403 if (likely(!IS_ERR(newfile))) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800404 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400405 return fd;
406 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400407
Al Viro28407632012-08-17 23:54:15 -0400408 put_unused_fd(fd);
409 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410}
411
John Fastabend406a3c62012-07-20 10:39:25 +0000412struct socket *sock_from_file(struct file *file, int *err)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800413{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800414 if (file->f_op == &socket_file_ops)
415 return file->private_data; /* set in sock_map_fd */
416
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800417 *err = -ENOTSOCK;
418 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800419}
John Fastabend406a3c62012-07-20 10:39:25 +0000420EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800421
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700423 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 * @fd: file handle
425 * @err: pointer to an error code return
426 *
427 * The file handle passed in is locked and the socket it is bound
428 * too is returned. If an error occurs the err pointer is overwritten
429 * with a negative errno code and NULL is returned. The function checks
430 * for both invalid handles and passing a handle which is not a socket.
431 *
432 * On a success the socket object pointer is returned.
433 */
434
435struct socket *sockfd_lookup(int fd, int *err)
436{
437 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 struct socket *sock;
439
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700440 file = fget(fd);
441 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 *err = -EBADF;
443 return NULL;
444 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700445
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800446 sock = sock_from_file(file, err);
447 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 return sock;
450}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700451EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800453static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
454{
Al Viro00e188e2014-03-03 23:48:18 -0500455 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800456 struct socket *sock;
457
Hua Zhong36725582006-04-19 15:25:02 -0700458 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500459 if (f.file) {
460 sock = sock_from_file(f.file, err);
461 if (likely(sock)) {
462 *fput_needed = f.flags;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800463 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500464 }
465 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800466 }
467 return NULL;
468}
469
Masatake YAMATO600e1772012-08-29 10:44:29 +0000470#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
471#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
472#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
473static ssize_t sockfs_getxattr(struct dentry *dentry,
474 const char *name, void *value, size_t size)
475{
476 const char *proto_name;
477 size_t proto_size;
478 int error;
479
480 error = -ENODATA;
481 if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) {
482 proto_name = dentry->d_name.name;
483 proto_size = strlen(proto_name);
484
485 if (value) {
486 error = -ERANGE;
487 if (proto_size + 1 > size)
488 goto out;
489
490 strncpy(value, proto_name, proto_size + 1);
491 }
492 error = proto_size + 1;
493 }
494
495out:
496 return error;
497}
498
499static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
500 size_t size)
501{
502 ssize_t len;
503 ssize_t used = 0;
504
505 len = security_inode_listsecurity(dentry->d_inode, buffer, size);
506 if (len < 0)
507 return len;
508 used += len;
509 if (buffer) {
510 if (size < used)
511 return -ERANGE;
512 buffer += len;
513 }
514
515 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
516 used += len;
517 if (buffer) {
518 if (size < used)
519 return -ERANGE;
520 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
521 buffer += len;
522 }
523
524 return used;
525}
526
527static const struct inode_operations sockfs_inode_ops = {
528 .getxattr = sockfs_getxattr,
529 .listxattr = sockfs_listxattr,
530};
531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532/**
533 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700534 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 * Allocate a new inode and socket object. The two are bound together
536 * and initialised. The socket is then returned. If we are out of inodes
537 * NULL is returned.
538 */
539
540static struct socket *sock_alloc(void)
541{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700542 struct inode *inode;
543 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200545 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 if (!inode)
547 return NULL;
548
549 sock = SOCKET_I(inode);
550
Eric Dumazet29a020d2009-09-15 02:39:20 -0700551 kmemcheck_annotate_bitfield(sock, type);
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400552 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700553 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100554 inode->i_uid = current_fsuid();
555 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000556 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
Alex Shi19e8d692012-05-14 14:15:31 -0700558 this_cpu_add(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 return sock;
560}
561
562/*
563 * In theory you can't get an open on this inode, but /proc provides
564 * a back door. Remember to keep it shut otherwise you'll let the
565 * creepy crawlies in.
566 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
569{
570 return -ENXIO;
571}
572
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800573const struct file_operations bad_sock_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 .owner = THIS_MODULE,
575 .open = sock_no_open,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200576 .llseek = noop_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577};
578
579/**
580 * sock_release - close a socket
581 * @sock: socket to close
582 *
583 * The socket is released from the protocol stack if it has a release
584 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700585 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700587
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588void sock_release(struct socket *sock)
589{
590 if (sock->ops) {
591 struct module *owner = sock->ops->owner;
592
593 sock->ops->release(sock);
594 sock->ops = NULL;
595 module_put(owner);
596 }
597
Eric Dumazeteaefd1102011-02-18 03:26:36 +0000598 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800599 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
Mikulas Patockab09e7862012-07-19 06:13:36 +0000601 if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
602 return;
603
Alex Shi19e8d692012-05-14 14:15:31 -0700604 this_cpu_sub(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 if (!sock->file) {
606 iput(SOCK_INODE(sock));
607 return;
608 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700609 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700611EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612
Daniel Borkmannbf84a0102013-04-14 08:08:13 +0000613void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000614{
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000615 *tx_flags = 0;
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400616 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000617 *tx_flags |= SKBTX_HW_TSTAMP;
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400618 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000619 *tx_flags |= SKBTX_SW_TSTAMP;
Willem de Bruijne7fd2882014-08-04 22:11:48 -0400620 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED)
621 *tx_flags |= SKBTX_SCHED_TSTAMP;
622
Johannes Berg6e3e9392011-11-09 10:15:42 +0100623 if (sock_flag(sk, SOCK_WIFI_STATUS))
624 *tx_flags |= SKBTX_WIFI_STATUS;
Patrick Ohly20d49472009-02-12 05:03:38 +0000625}
626EXPORT_SYMBOL(sock_tx_timestamp);
627
Anton Blanchard228e5482011-05-02 20:21:35 +0000628static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
629 struct msghdr *msg, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630{
631 struct sock_iocb *si = kiocb_to_siocb(iocb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
633 si->sock = sock;
634 si->scm = NULL;
635 si->msg = msg;
636 si->size = size;
637
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 return sock->ops->sendmsg(iocb, sock, msg, size);
639}
640
Anton Blanchard228e5482011-05-02 20:21:35 +0000641static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
642 struct msghdr *msg, size_t size)
643{
644 int err = security_socket_sendmsg(sock, msg, size);
645
646 return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
647}
648
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
650{
651 struct kiocb iocb;
652 struct sock_iocb siocb;
653 int ret;
654
655 init_sync_kiocb(&iocb, NULL);
656 iocb.private = &siocb;
657 ret = __sock_sendmsg(&iocb, sock, msg, size);
658 if (-EIOCBQUEUED == ret)
659 ret = wait_on_sync_kiocb(&iocb);
660 return ret;
661}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700662EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
Eric Dumazet894dc242011-07-26 02:39:41 +0000664static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
Anton Blanchard228e5482011-05-02 20:21:35 +0000665{
666 struct kiocb iocb;
667 struct sock_iocb siocb;
668 int ret;
669
670 init_sync_kiocb(&iocb, NULL);
671 iocb.private = &siocb;
672 ret = __sock_sendmsg_nosec(&iocb, sock, msg, size);
673 if (-EIOCBQUEUED == ret)
674 ret = wait_on_sync_kiocb(&iocb);
675 return ret;
676}
677
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
679 struct kvec *vec, size_t num, size_t size)
680{
681 mm_segment_t oldfs = get_fs();
682 int result;
683
684 set_fs(KERNEL_DS);
685 /*
686 * the following is safe, since for compiler definitions of kvec and
687 * iovec are identical, yielding the same in-core layout and alignment
688 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700689 msg->msg_iov = (struct iovec *)vec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 msg->msg_iovlen = num;
691 result = sock_sendmsg(sock, msg, size);
692 set_fs(oldfs);
693 return result;
694}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700695EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700697/*
698 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
699 */
700void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
701 struct sk_buff *skb)
702{
Patrick Ohly20d49472009-02-12 05:03:38 +0000703 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400704 struct scm_timestamping tss;
Patrick Ohly20d49472009-02-12 05:03:38 +0000705 int empty = 1;
706 struct skb_shared_hwtstamps *shhwtstamps =
707 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700708
Patrick Ohly20d49472009-02-12 05:03:38 +0000709 /* Race occurred between timestamp enabling and packet
710 receiving. Fill in the current time for now. */
711 if (need_software_tstamp && skb->tstamp.tv64 == 0)
712 __net_timestamp(skb);
713
714 if (need_software_tstamp) {
715 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
716 struct timeval tv;
717 skb_get_timestamp(skb, &tv);
718 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
719 sizeof(tv), &tv);
720 } else {
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400721 struct timespec ts;
722 skb_get_timestampns(skb, &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000723 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400724 sizeof(ts), &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000725 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700726 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000727
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400728 memset(&tss, 0, sizeof(tss));
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400729 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE ||
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400730 skb_shinfo(skb)->tx_flags & SKBTX_ANY_SW_TSTAMP) &&
731 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000732 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400733 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400734 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400735 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2))
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400736 empty = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000737 if (!empty)
738 put_cmsg(msg, SOL_SOCKET,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400739 SCM_TIMESTAMPING, sizeof(tss), &tss);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700740}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300741EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
742
Johannes Berg6e3e9392011-11-09 10:15:42 +0100743void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
744 struct sk_buff *skb)
745{
746 int ack;
747
748 if (!sock_flag(sk, SOCK_WIFI_STATUS))
749 return;
750 if (!skb->wifi_acked_valid)
751 return;
752
753 ack = skb->wifi_acked;
754
755 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
756}
757EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
758
stephen hemminger11165f12010-10-18 14:27:29 +0000759static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
760 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700761{
762 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
763 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
764 sizeof(__u32), &skb->dropcount);
765}
766
Eric Dumazet767dd032010-04-28 19:14:43 +0000767void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700768 struct sk_buff *skb)
769{
770 sock_recv_timestamp(msg, sk, skb);
771 sock_recv_drops(msg, sk, skb);
772}
Eric Dumazet767dd032010-04-28 19:14:43 +0000773EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700774
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700775static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
776 struct msghdr *msg, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 struct sock_iocb *si = kiocb_to_siocb(iocb);
779
780 si->sock = sock;
781 si->scm = NULL;
782 si->msg = msg;
783 si->size = size;
784 si->flags = flags;
785
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
787}
788
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700789static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
790 struct msghdr *msg, size_t size, int flags)
791{
792 int err = security_socket_recvmsg(sock, msg, size, flags);
793
794 return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
795}
796
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700797int sock_recvmsg(struct socket *sock, struct msghdr *msg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 size_t size, int flags)
799{
800 struct kiocb iocb;
801 struct sock_iocb siocb;
802 int ret;
803
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700804 init_sync_kiocb(&iocb, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 iocb.private = &siocb;
806 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
807 if (-EIOCBQUEUED == ret)
808 ret = wait_on_sync_kiocb(&iocb);
809 return ret;
810}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700811EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700813static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
814 size_t size, int flags)
815{
816 struct kiocb iocb;
817 struct sock_iocb siocb;
818 int ret;
819
820 init_sync_kiocb(&iocb, NULL);
821 iocb.private = &siocb;
822 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
823 if (-EIOCBQUEUED == ret)
824 ret = wait_on_sync_kiocb(&iocb);
825 return ret;
826}
827
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000828/**
829 * kernel_recvmsg - Receive a message from a socket (kernel space)
830 * @sock: The socket to receive the message from
831 * @msg: Received message
832 * @vec: Input s/g array for message data
833 * @num: Size of input s/g array
834 * @size: Number of bytes to read
835 * @flags: Message flags (MSG_DONTWAIT, etc...)
836 *
837 * On return the msg structure contains the scatter/gather array passed in the
838 * vec argument. The array is modified so that it consists of the unfilled
839 * portion of the original array.
840 *
841 * The returned value is the total number of bytes received, or an error.
842 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700843int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
844 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845{
846 mm_segment_t oldfs = get_fs();
847 int result;
848
849 set_fs(KERNEL_DS);
850 /*
851 * the following is safe, since for compiler definitions of kvec and
852 * iovec are identical, yielding the same in-core layout and alignment
853 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700854 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 result = sock_recvmsg(sock, msg, size, flags);
856 set_fs(oldfs);
857 return result;
858}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700859EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300861static ssize_t sock_sendpage(struct file *file, struct page *page,
862 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863{
864 struct socket *sock;
865 int flags;
866
Eric Dumazetb69aee02005-09-06 14:42:45 -0700867 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
Eric Dumazet35f9c092012-04-05 03:05:35 +0000869 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
870 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
871 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
Linus Torvaldse6949582009-08-13 08:28:36 -0700873 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874}
875
Jens Axboe9c55e012007-11-06 23:30:13 -0800876static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700877 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800878 unsigned int flags)
879{
880 struct socket *sock = file->private_data;
881
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800882 if (unlikely(!sock->ops->splice_read))
883 return -EINVAL;
884
Jens Axboe9c55e012007-11-06 23:30:13 -0800885 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
886}
887
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800888static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700889 struct sock_iocb *siocb)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800890{
Kent Overstreetd29c4452013-03-18 11:09:26 -0700891 if (!is_sync_kiocb(iocb))
892 BUG();
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800893
894 siocb->kiocb = iocb;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800895 iocb->private = siocb;
896 return siocb;
897}
898
899static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700900 struct file *file, const struct iovec *iov,
901 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800902{
903 struct socket *sock = file->private_data;
904 size_t size = 0;
905 int i;
906
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700907 for (i = 0; i < nr_segs; i++)
908 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800909
910 msg->msg_name = NULL;
911 msg->msg_namelen = 0;
912 msg->msg_control = NULL;
913 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700914 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800915 msg->msg_iovlen = nr_segs;
916 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
917
918 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
919}
920
Badari Pulavarty027445c2006-09-30 23:28:46 -0700921static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
922 unsigned long nr_segs, loff_t pos)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800923{
924 struct sock_iocb siocb, *x;
925
926 if (pos != 0)
927 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700928
Kent Overstreet73a70752013-05-09 15:03:42 -0700929 if (iocb->ki_nbytes == 0) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800930 return 0;
931
Badari Pulavarty027445c2006-09-30 23:28:46 -0700932
933 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800934 if (!x)
935 return -ENOMEM;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700936 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800937}
938
939static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700940 struct file *file, const struct iovec *iov,
941 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800942{
943 struct socket *sock = file->private_data;
944 size_t size = 0;
945 int i;
946
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700947 for (i = 0; i < nr_segs; i++)
948 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800949
950 msg->msg_name = NULL;
951 msg->msg_namelen = 0;
952 msg->msg_control = NULL;
953 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700954 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800955 msg->msg_iovlen = nr_segs;
956 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
957 if (sock->type == SOCK_SEQPACKET)
958 msg->msg_flags |= MSG_EOR;
959
960 return __sock_sendmsg(iocb, sock, msg, size);
961}
962
Badari Pulavarty027445c2006-09-30 23:28:46 -0700963static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
964 unsigned long nr_segs, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965{
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800966 struct sock_iocb siocb, *x;
967
968 if (pos != 0)
969 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700970
Badari Pulavarty027445c2006-09-30 23:28:46 -0700971 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800972 if (!x)
973 return -ENOMEM;
974
Badari Pulavarty027445c2006-09-30 23:28:46 -0700975 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976}
977
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978/*
979 * Atomic setting of ioctl hooks to avoid race
980 * with module unload.
981 */
982
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800983static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700984static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
Eric W. Biederman881d9662007-09-17 11:56:21 -0700986void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800988 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800990 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991}
992EXPORT_SYMBOL(brioctl_set);
993
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800994static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700995static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996
Eric W. Biederman881d9662007-09-17 11:56:21 -0700997void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800999 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001001 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002}
1003EXPORT_SYMBOL(vlan_ioctl_set);
1004
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001005static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001006static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001008void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001010 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001012 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013}
1014EXPORT_SYMBOL(dlci_ioctl_set);
1015
Arnd Bergmann6b960182009-11-06 23:10:54 -08001016static long sock_do_ioctl(struct net *net, struct socket *sock,
1017 unsigned int cmd, unsigned long arg)
1018{
1019 int err;
1020 void __user *argp = (void __user *)arg;
1021
1022 err = sock->ops->ioctl(sock, cmd, arg);
1023
1024 /*
1025 * If this ioctl is unknown try to hand it down
1026 * to the NIC driver.
1027 */
1028 if (err == -ENOIOCTLCMD)
1029 err = dev_ioctl(net, cmd, argp);
1030
1031 return err;
1032}
1033
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034/*
1035 * With an ioctl, arg may well be a user mode pointer, but we don't know
1036 * what to do with it - that's up to the protocol still.
1037 */
1038
1039static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1040{
1041 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001042 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 void __user *argp = (void __user *)arg;
1044 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001045 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
Eric Dumazetb69aee02005-09-06 14:42:45 -07001047 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001048 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001049 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
Eric W. Biederman881d9662007-09-17 11:56:21 -07001051 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001053#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Eric W. Biederman881d9662007-09-17 11:56:21 -07001055 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001057#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001058 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 case FIOSETOWN:
1060 case SIOCSPGRP:
1061 err = -EFAULT;
1062 if (get_user(pid, (int __user *)argp))
1063 break;
1064 err = f_setown(sock->file, pid, 1);
1065 break;
1066 case FIOGETOWN:
1067 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001068 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001069 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 break;
1071 case SIOCGIFBR:
1072 case SIOCSIFBR:
1073 case SIOCBRADDBR:
1074 case SIOCBRDELBR:
1075 err = -ENOPKG;
1076 if (!br_ioctl_hook)
1077 request_module("bridge");
1078
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001079 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001080 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001081 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001082 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 break;
1084 case SIOCGIFVLAN:
1085 case SIOCSIFVLAN:
1086 err = -ENOPKG;
1087 if (!vlan_ioctl_hook)
1088 request_module("8021q");
1089
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001090 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001092 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001093 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 case SIOCADDDLCI:
1096 case SIOCDELDLCI:
1097 err = -ENOPKG;
1098 if (!dlci_ioctl_hook)
1099 request_module("dlci");
1100
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001101 mutex_lock(&dlci_ioctl_mutex);
1102 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001104 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 break;
1106 default:
Arnd Bergmann6b960182009-11-06 23:10:54 -08001107 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001109 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 return err;
1111}
1112
1113int sock_create_lite(int family, int type, int protocol, struct socket **res)
1114{
1115 int err;
1116 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001117
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 err = security_socket_create(family, type, protocol, 1);
1119 if (err)
1120 goto out;
1121
1122 sock = sock_alloc();
1123 if (!sock) {
1124 err = -ENOMEM;
1125 goto out;
1126 }
1127
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001129 err = security_socket_post_create(sock, family, type, protocol, 1);
1130 if (err)
1131 goto out_release;
1132
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133out:
1134 *res = sock;
1135 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001136out_release:
1137 sock_release(sock);
1138 sock = NULL;
1139 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001141EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142
1143/* No kernel lock held - perfect */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001144static unsigned int sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145{
Eliezer Tamircbf55002013-07-08 16:20:34 +03001146 unsigned int busy_flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 struct socket *sock;
1148
1149 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001150 * We can't return errors to poll, so it's either yes or no.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 */
Eric Dumazetb69aee02005-09-06 14:42:45 -07001152 sock = file->private_data;
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001153
Eliezer Tamircbf55002013-07-08 16:20:34 +03001154 if (sk_can_busy_loop(sock->sk)) {
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001155 /* this socket can poll_ll so tell the system call */
Eliezer Tamircbf55002013-07-08 16:20:34 +03001156 busy_flag = POLL_BUSY_LOOP;
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001157
1158 /* once, only if requested by syscall */
Eliezer Tamircbf55002013-07-08 16:20:34 +03001159 if (wait && (wait->_key & POLL_BUSY_LOOP))
1160 sk_busy_loop(sock->sk, 1);
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001161 }
1162
Eliezer Tamircbf55002013-07-08 16:20:34 +03001163 return busy_flag | sock->ops->poll(file, sock, wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164}
1165
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001166static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001168 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169
1170 return sock->ops->mmap(file, sock, vma);
1171}
1172
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001173static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 sock_release(SOCKET_I(inode));
1176 return 0;
1177}
1178
1179/*
1180 * Update the socket async list
1181 *
1182 * Fasync_list locking strategy.
1183 *
1184 * 1. fasync_list is modified only under process context socket lock
1185 * i.e. under semaphore.
1186 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001187 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 */
1189
1190static int sock_fasync(int fd, struct file *filp, int on)
1191{
Eric Dumazet989a2972010-04-14 09:55:35 +00001192 struct socket *sock = filp->private_data;
1193 struct sock *sk = sock->sk;
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001194 struct socket_wq *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
Eric Dumazet989a2972010-04-14 09:55:35 +00001196 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
1199 lock_sock(sk);
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001200 wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
1201 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001203 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001204 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001205 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001206 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
Eric Dumazet989a2972010-04-14 09:55:35 +00001208 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 return 0;
1210}
1211
Eric Dumazet43815482010-04-29 11:01:49 +00001212/* This function may be called only under socket lock or callback_lock or rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213
1214int sock_wake_async(struct socket *sock, int how, int band)
1215{
Eric Dumazet43815482010-04-29 11:01:49 +00001216 struct socket_wq *wq;
1217
1218 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001220 rcu_read_lock();
1221 wq = rcu_dereference(sock->wq);
1222 if (!wq || !wq->fasync_list) {
1223 rcu_read_unlock();
1224 return -1;
1225 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001226 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001227 case SOCK_WAKE_WAITD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1229 break;
1230 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001231 case SOCK_WAKE_SPACE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1233 break;
1234 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001235 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001236call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001237 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001239 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001240 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 }
Eric Dumazet43815482010-04-29 11:01:49 +00001242 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 return 0;
1244}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001245EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246
Pavel Emelyanov721db932010-09-29 16:06:32 +04001247int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001248 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249{
1250 int err;
1251 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001252 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
1254 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001255 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 */
1257 if (family < 0 || family >= NPROTO)
1258 return -EAFNOSUPPORT;
1259 if (type < 0 || type >= SOCK_MAX)
1260 return -EINVAL;
1261
1262 /* Compatibility.
1263
1264 This uglymoron is moved from INET layer to here to avoid
1265 deadlock in module load.
1266 */
1267 if (family == PF_INET && type == SOCK_PACKET) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001268 static int warned;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 if (!warned) {
1270 warned = 1;
Yang Yingliang3410f222014-02-12 17:09:55 +08001271 pr_info("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1272 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 }
1274 family = PF_PACKET;
1275 }
1276
1277 err = security_socket_create(family, type, protocol, kern);
1278 if (err)
1279 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001280
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001281 /*
1282 * Allocate the socket and allow the family to set things up. if
1283 * the protocol is 0, the family is instructed to select an appropriate
1284 * default.
1285 */
1286 sock = sock_alloc();
1287 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001288 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001289 return -ENFILE; /* Not exactly a match, but its the
1290 closest posix thing */
1291 }
1292
1293 sock->type = type;
1294
Johannes Berg95a5afc2008-10-16 15:24:51 -07001295#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001296 /* Attempt to load a protocol module if the find failed.
1297 *
1298 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 * requested real, full-featured networking support upon configuration.
1300 * Otherwise module support will break!
1301 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001302 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001303 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304#endif
1305
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001306 rcu_read_lock();
1307 pf = rcu_dereference(net_families[family]);
1308 err = -EAFNOSUPPORT;
1309 if (!pf)
1310 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311
1312 /*
1313 * We will call the ->create function, that possibly is in a loadable
1314 * module, so we have to bump that loadable module refcnt first.
1315 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001316 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 goto out_release;
1318
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001319 /* Now protected by module ref count */
1320 rcu_read_unlock();
1321
Eric Paris3f378b62009-11-05 22:18:14 -08001322 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001323 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001325
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 /*
1327 * Now to bump the refcnt of the [loadable] module that owns this
1328 * socket at sock_release time we decrement its refcnt.
1329 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001330 if (!try_module_get(sock->ops->owner))
1331 goto out_module_busy;
1332
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 /*
1334 * Now that we're done with the ->create function, the [loadable]
1335 * module can have its refcnt decremented
1336 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001337 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001338 err = security_socket_post_create(sock, family, type, protocol, kern);
1339 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001340 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001341 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001343 return 0;
1344
1345out_module_busy:
1346 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001348 sock->ops = NULL;
1349 module_put(pf->owner);
1350out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001352 return err;
1353
1354out_release:
1355 rcu_read_unlock();
1356 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001358EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359
1360int sock_create(int family, int type, int protocol, struct socket **res)
1361{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001362 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001364EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365
1366int sock_create_kern(int family, int type, int protocol, struct socket **res)
1367{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001368 return __sock_create(&init_net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001370EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001372SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373{
1374 int retval;
1375 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001376 int flags;
1377
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001378 /* Check the SOCK_* constants for consistency. */
1379 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1380 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1381 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1382 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1383
Ulrich Dreppera677a032008-07-23 21:29:17 -07001384 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001385 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001386 return -EINVAL;
1387 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001389 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1390 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1391
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 retval = sock_create(family, type, protocol, &sock);
1393 if (retval < 0)
1394 goto out;
1395
Ulrich Drepper77d27202008-07-23 21:29:35 -07001396 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 if (retval < 0)
1398 goto out_release;
1399
1400out:
1401 /* It may be already another descriptor 8) Not kernel problem. */
1402 return retval;
1403
1404out_release:
1405 sock_release(sock);
1406 return retval;
1407}
1408
1409/*
1410 * Create a pair of connected sockets.
1411 */
1412
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001413SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1414 int __user *, usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415{
1416 struct socket *sock1, *sock2;
1417 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001418 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001419 int flags;
1420
1421 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001422 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001423 return -EINVAL;
1424 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001426 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1427 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1428
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 /*
1430 * Obtain the first socket and check if the underlying protocol
1431 * supports the socketpair call.
1432 */
1433
1434 err = sock_create(family, type, protocol, &sock1);
1435 if (err < 0)
1436 goto out;
1437
1438 err = sock_create(family, type, protocol, &sock2);
1439 if (err < 0)
1440 goto out_release_1;
1441
1442 err = sock1->ops->socketpair(sock1, sock2);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001443 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 goto out_release_both;
1445
Al Viro28407632012-08-17 23:54:15 -04001446 fd1 = get_unused_fd_flags(flags);
David S. Millerbf3c23d2007-10-29 21:54:02 -07001447 if (unlikely(fd1 < 0)) {
1448 err = fd1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 goto out_release_both;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001450 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001451
Al Viro28407632012-08-17 23:54:15 -04001452 fd2 = get_unused_fd_flags(flags);
Al Viro198de4d2009-08-05 19:29:23 +04001453 if (unlikely(fd2 < 0)) {
1454 err = fd2;
Yann Droneaudd73aa282013-12-09 22:42:20 +01001455 goto out_put_unused_1;
Al Viro28407632012-08-17 23:54:15 -04001456 }
1457
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001458 newfile1 = sock_alloc_file(sock1, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001459 if (unlikely(IS_ERR(newfile1))) {
1460 err = PTR_ERR(newfile1);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001461 goto out_put_unused_both;
Al Viro28407632012-08-17 23:54:15 -04001462 }
1463
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001464 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001465 if (IS_ERR(newfile2)) {
1466 err = PTR_ERR(newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001467 goto out_fput_1;
Al Virodb349502007-02-07 01:48:00 -05001468 }
1469
Yann Droneaudd73aa282013-12-09 22:42:20 +01001470 err = put_user(fd1, &usockvec[0]);
1471 if (err)
1472 goto out_fput_both;
1473
1474 err = put_user(fd2, &usockvec[1]);
1475 if (err)
1476 goto out_fput_both;
1477
Al Viro157cf642008-12-14 04:57:47 -05001478 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001479
Al Virodb349502007-02-07 01:48:00 -05001480 fd_install(fd1, newfile1);
1481 fd_install(fd2, newfile2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 /* fd1 and fd2 may be already another descriptors.
1483 * Not kernel problem.
1484 */
1485
Yann Droneaudd73aa282013-12-09 22:42:20 +01001486 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487
Yann Droneaudd73aa282013-12-09 22:42:20 +01001488out_fput_both:
1489 fput(newfile2);
1490 fput(newfile1);
1491 put_unused_fd(fd2);
1492 put_unused_fd(fd1);
1493 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494
Yann Droneaudd73aa282013-12-09 22:42:20 +01001495out_fput_1:
1496 fput(newfile1);
1497 put_unused_fd(fd2);
1498 put_unused_fd(fd1);
1499 sock_release(sock2);
1500 goto out;
1501
1502out_put_unused_both:
1503 put_unused_fd(fd2);
1504out_put_unused_1:
1505 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506out_release_both:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001507 sock_release(sock2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508out_release_1:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001509 sock_release(sock1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510out:
1511 return err;
1512}
1513
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514/*
1515 * Bind a name to a socket. Nothing much to do here since it's
1516 * the protocol's responsibility to handle the local address.
1517 *
1518 * We move the socket address to kernel space before we call
1519 * the protocol layer (having also checked the address is ok).
1520 */
1521
Heiko Carstens20f37032009-01-14 14:14:23 +01001522SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523{
1524 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001525 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001526 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001528 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001529 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001530 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001531 if (err >= 0) {
1532 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001533 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001534 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001535 if (!err)
1536 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001537 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001538 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001540 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001541 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 return err;
1543}
1544
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545/*
1546 * Perform a listen. Basically, we allow the protocol to do anything
1547 * necessary for a listen, and if that works, we mark the socket as
1548 * ready for listening.
1549 */
1550
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001551SYSCALL_DEFINE2(listen, int, fd, int, backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552{
1553 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001554 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001555 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001556
1557 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1558 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001559 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001560 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001561 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562
1563 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001564 if (!err)
1565 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001567 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568 }
1569 return err;
1570}
1571
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572/*
1573 * For accept, we attempt to create a new socket, set up the link
1574 * with the client, wake up the client, then return the new
1575 * connected fd. We collect the address of the connector in kernel
1576 * space and move it to user at the very end. This is unclean because
1577 * we open the socket then return an error.
1578 *
1579 * 1003.1g adds the ability to recvmsg() to query connection pending
1580 * status to recvmsg. We need to add that support in a way thats
1581 * clean when we restucture accept also.
1582 */
1583
Heiko Carstens20f37032009-01-14 14:14:23 +01001584SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1585 int __user *, upeer_addrlen, int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586{
1587 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001588 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001589 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001590 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591
Ulrich Drepper77d27202008-07-23 21:29:35 -07001592 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001593 return -EINVAL;
1594
1595 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1596 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1597
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001598 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599 if (!sock)
1600 goto out;
1601
1602 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001603 newsock = sock_alloc();
1604 if (!newsock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 goto out_put;
1606
1607 newsock->type = sock->type;
1608 newsock->ops = sock->ops;
1609
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 /*
1611 * We don't need try_module_get here, as the listening socket (sock)
1612 * has the protocol module (sock->ops->owner) held.
1613 */
1614 __module_get(newsock->ops->owner);
1615
Al Viro28407632012-08-17 23:54:15 -04001616 newfd = get_unused_fd_flags(flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001617 if (unlikely(newfd < 0)) {
1618 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001619 sock_release(newsock);
1620 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001621 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001622 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Al Viro28407632012-08-17 23:54:15 -04001623 if (unlikely(IS_ERR(newfile))) {
1624 err = PTR_ERR(newfile);
1625 put_unused_fd(newfd);
1626 sock_release(newsock);
1627 goto out_put;
1628 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001629
Frank Filza79af592005-09-27 15:23:38 -07001630 err = security_socket_accept(sock, newsock);
1631 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001632 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001633
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1635 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001636 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637
1638 if (upeer_sockaddr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001639 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001640 &len, 2) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001642 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001644 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001645 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001647 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 }
1649
1650 /* File flags are not inherited via accept() unlike another OSes. */
1651
David S. Miller39d8c1b2006-03-20 17:13:49 -08001652 fd_install(newfd, newfile);
1653 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001656 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657out:
1658 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001659out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001660 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001661 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662 goto out_put;
1663}
1664
Heiko Carstens20f37032009-01-14 14:14:23 +01001665SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1666 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001667{
Ulrich Drepperde11def2008-11-19 15:36:14 -08001668 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001669}
1670
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671/*
1672 * Attempt to connect to a socket with the server address. The address
1673 * is in user space so we verify it is OK and move it to kernel space.
1674 *
1675 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1676 * break bindings
1677 *
1678 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1679 * other SEQPACKET protocols that take time to connect() as it doesn't
1680 * include the -EINPROGRESS status for such sockets.
1681 */
1682
Heiko Carstens20f37032009-01-14 14:14:23 +01001683SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1684 int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685{
1686 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001687 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001688 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001690 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 if (!sock)
1692 goto out;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001693 err = move_addr_to_kernel(uservaddr, addrlen, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694 if (err < 0)
1695 goto out_put;
1696
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001697 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001698 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 if (err)
1700 goto out_put;
1701
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001702 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 sock->file->f_flags);
1704out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001705 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706out:
1707 return err;
1708}
1709
1710/*
1711 * Get the local address ('name') of a socket object. Move the obtained
1712 * name to user space.
1713 */
1714
Heiko Carstens20f37032009-01-14 14:14:23 +01001715SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1716 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717{
1718 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001719 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001720 int len, err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001721
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001722 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 if (!sock)
1724 goto out;
1725
1726 err = security_socket_getsockname(sock);
1727 if (err)
1728 goto out_put;
1729
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001730 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731 if (err)
1732 goto out_put;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001733 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734
1735out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001736 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737out:
1738 return err;
1739}
1740
1741/*
1742 * Get the remote address ('name') of a socket object. Move the obtained
1743 * name to user space.
1744 */
1745
Heiko Carstens20f37032009-01-14 14:14:23 +01001746SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1747 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748{
1749 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001750 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001751 int len, err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001753 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1754 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755 err = security_socket_getpeername(sock);
1756 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001757 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758 return err;
1759 }
1760
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001761 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001762 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001763 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764 if (!err)
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001765 err = move_addr_to_user(&address, len, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001766 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001767 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 }
1769 return err;
1770}
1771
1772/*
1773 * Send a datagram to a given address. We move the address into kernel
1774 * space and check the user space data area is readable before invoking
1775 * the protocol.
1776 */
1777
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001778SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001779 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001780 int, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781{
1782 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001783 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784 int err;
1785 struct msghdr msg;
1786 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001787 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001788
Linus Torvalds253eacc2010-10-30 16:43:10 -07001789 if (len > INT_MAX)
1790 len = INT_MAX;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001791 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1792 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001793 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001794
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001795 iov.iov_base = buff;
1796 iov.iov_len = len;
1797 msg.msg_name = NULL;
1798 msg.msg_iov = &iov;
1799 msg.msg_iovlen = 1;
1800 msg.msg_control = NULL;
1801 msg.msg_controllen = 0;
1802 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001803 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001804 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 if (err < 0)
1806 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001807 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001808 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809 }
1810 if (sock->file->f_flags & O_NONBLOCK)
1811 flags |= MSG_DONTWAIT;
1812 msg.msg_flags = flags;
1813 err = sock_sendmsg(sock, &msg, len);
1814
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001815out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001816 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001817out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818 return err;
1819}
1820
1821/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001822 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 */
1824
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001825SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001826 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827{
1828 return sys_sendto(fd, buff, len, flags, NULL, 0);
1829}
1830
1831/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001832 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 * sender. We verify the buffers are writable and if needed move the
1834 * sender address from kernel to user space.
1835 */
1836
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001837SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
Eric Dumazet95c96172012-04-15 05:58:06 +00001838 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001839 int __user *, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840{
1841 struct socket *sock;
1842 struct iovec iov;
1843 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001844 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001845 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001846 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847
Linus Torvalds253eacc2010-10-30 16:43:10 -07001848 if (size > INT_MAX)
1849 size = INT_MAX;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001850 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001852 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001854 msg.msg_control = NULL;
1855 msg.msg_controllen = 0;
1856 msg.msg_iovlen = 1;
1857 msg.msg_iov = &iov;
1858 iov.iov_len = size;
1859 iov.iov_base = ubuf;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01001860 /* Save some cycles and don't copy the address if not needed */
1861 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1862 /* We assume all kernel code knows the size of sockaddr_storage */
1863 msg.msg_namelen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864 if (sock->file->f_flags & O_NONBLOCK)
1865 flags |= MSG_DONTWAIT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001866 err = sock_recvmsg(sock, &msg, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001868 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001869 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001870 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001871 if (err2 < 0)
1872 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001874
1875 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001876out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877 return err;
1878}
1879
1880/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001881 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 */
1883
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02001884SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1885 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886{
1887 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1888}
1889
1890/*
1891 * Set a socket option. Because we don't know the option lengths we have
1892 * to pass the user mode parameter for the protocols to sort out.
1893 */
1894
Heiko Carstens20f37032009-01-14 14:14:23 +01001895SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1896 char __user *, optval, int, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001898 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899 struct socket *sock;
1900
1901 if (optlen < 0)
1902 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001903
1904 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1905 if (sock != NULL) {
1906 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001907 if (err)
1908 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909
1910 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001911 err =
1912 sock_setsockopt(sock, level, optname, optval,
1913 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001915 err =
1916 sock->ops->setsockopt(sock, level, optname, optval,
1917 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001918out_put:
1919 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920 }
1921 return err;
1922}
1923
1924/*
1925 * Get a socket option. Because we don't know the option lengths we have
1926 * to pass a user mode parameter for the protocols to sort out.
1927 */
1928
Heiko Carstens20f37032009-01-14 14:14:23 +01001929SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1930 char __user *, optval, int __user *, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001932 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933 struct socket *sock;
1934
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001935 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1936 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001937 err = security_socket_getsockopt(sock, level, optname);
1938 if (err)
1939 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940
1941 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001942 err =
1943 sock_getsockopt(sock, level, optname, optval,
1944 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001946 err =
1947 sock->ops->getsockopt(sock, level, optname, optval,
1948 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001949out_put:
1950 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951 }
1952 return err;
1953}
1954
Linus Torvalds1da177e2005-04-16 15:20:36 -07001955/*
1956 * Shutdown a socket.
1957 */
1958
Heiko Carstens754fe8d2009-01-14 14:14:09 +01001959SYSCALL_DEFINE2(shutdown, int, fd, int, how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001960{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001961 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 struct socket *sock;
1963
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001964 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1965 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001966 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001967 if (!err)
1968 err = sock->ops->shutdown(sock, how);
1969 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001970 }
1971 return err;
1972}
1973
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001974/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 * fields which are the same type (int / unsigned) on our platforms.
1976 */
1977#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1978#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1979#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1980
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001981struct used_address {
1982 struct sockaddr_storage name;
1983 unsigned int name_len;
1984};
1985
Dan Carpenter1661bf32013-10-03 00:27:20 +03001986static int copy_msghdr_from_user(struct msghdr *kmsg,
1987 struct msghdr __user *umsg)
1988{
1989 if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
1990 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00001991
1992 if (kmsg->msg_namelen < 0)
1993 return -EINVAL;
1994
Dan Carpenter1661bf32013-10-03 00:27:20 +03001995 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03001996 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Dan Carpenter1661bf32013-10-03 00:27:20 +03001997 return 0;
1998}
1999
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002000static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002001 struct msghdr *msg_sys, unsigned int flags,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002002 struct used_address *used_address)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002004 struct compat_msghdr __user *msg_compat =
2005 (struct compat_msghdr __user *)msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002006 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07002008 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002009 __attribute__ ((aligned(sizeof(__kernel_size_t))));
2010 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011 unsigned char *ctl_buf = ctl;
Eric Dumazeta74e9102012-04-20 20:04:01 +02002012 int err, ctl_len, total_len;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002013
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014 err = -EFAULT;
2015 if (MSG_CMSG_COMPAT & flags) {
Anton Blanchard228e5482011-05-02 20:21:35 +00002016 if (get_compat_msghdr(msg_sys, msg_compat))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017 return -EFAULT;
Dan Carpenter1661bf32013-10-03 00:27:20 +03002018 } else {
2019 err = copy_msghdr_from_user(msg_sys, msg);
2020 if (err)
2021 return err;
2022 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023
Anton Blanchard228e5482011-05-02 20:21:35 +00002024 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
Eric Dumazeta74e9102012-04-20 20:04:01 +02002025 err = -EMSGSIZE;
2026 if (msg_sys->msg_iovlen > UIO_MAXIOV)
2027 goto out;
2028 err = -ENOMEM;
2029 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
2030 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002031 if (!iov)
Anton Blanchard228e5482011-05-02 20:21:35 +00002032 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033 }
2034
2035 /* This will also move the address data into kernel space */
2036 if (MSG_CMSG_COMPAT & flags) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002037 err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038 } else
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002039 err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002040 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002041 goto out_freeiov;
2042 total_len = err;
2043
2044 err = -ENOBUFS;
2045
Anton Blanchard228e5482011-05-02 20:21:35 +00002046 if (msg_sys->msg_controllen > INT_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002047 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00002048 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002050 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00002051 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002052 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002053 if (err)
2054 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00002055 ctl_buf = msg_sys->msg_control;
2056 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057 } else if (ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002058 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002060 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061 goto out_freeiov;
2062 }
2063 err = -EFAULT;
2064 /*
Anton Blanchard228e5482011-05-02 20:21:35 +00002065 * Careful! Before this, msg_sys->msg_control contains a user pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2067 * checking falls down on this.
2068 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00002069 if (copy_from_user(ctl_buf,
Anton Blanchard228e5482011-05-02 20:21:35 +00002070 (void __user __force *)msg_sys->msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002071 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00002073 msg_sys->msg_control = ctl_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002074 }
Anton Blanchard228e5482011-05-02 20:21:35 +00002075 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076
2077 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00002078 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002079 /*
2080 * If this is sendmmsg() and current destination address is same as
2081 * previously succeeded address, omit asking LSM's decision.
2082 * used_address->name_len is initialized to UINT_MAX so that the first
2083 * destination address never matches.
2084 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002085 if (used_address && msg_sys->msg_name &&
2086 used_address->name_len == msg_sys->msg_namelen &&
2087 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002088 used_address->name_len)) {
2089 err = sock_sendmsg_nosec(sock, msg_sys, total_len);
2090 goto out_freectl;
2091 }
2092 err = sock_sendmsg(sock, msg_sys, total_len);
2093 /*
2094 * If this is sendmmsg() and sending to current destination address was
2095 * successful, remember it.
2096 */
2097 if (used_address && err >= 0) {
2098 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002099 if (msg_sys->msg_name)
2100 memcpy(&used_address->name, msg_sys->msg_name,
2101 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002102 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103
2104out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002105 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002106 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2107out_freeiov:
2108 if (iov != iovstack)
Eric Dumazeta74e9102012-04-20 20:04:01 +02002109 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00002110out:
2111 return err;
2112}
2113
2114/*
2115 * BSD sendmsg interface
2116 */
2117
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002118long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
Anton Blanchard228e5482011-05-02 20:21:35 +00002119{
2120 int fput_needed, err;
2121 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002122 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00002123
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002124 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00002125 if (!sock)
2126 goto out;
2127
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002128 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
Anton Blanchard228e5482011-05-02 20:21:35 +00002129
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002130 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002131out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002132 return err;
2133}
2134
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002135SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
2136{
2137 if (flags & MSG_CMSG_COMPAT)
2138 return -EINVAL;
2139 return __sys_sendmsg(fd, msg, flags);
2140}
2141
Anton Blanchard228e5482011-05-02 20:21:35 +00002142/*
2143 * Linux sendmmsg interface
2144 */
2145
2146int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2147 unsigned int flags)
2148{
2149 int fput_needed, err, datagrams;
2150 struct socket *sock;
2151 struct mmsghdr __user *entry;
2152 struct compat_mmsghdr __user *compat_entry;
2153 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002154 struct used_address used_address;
Anton Blanchard228e5482011-05-02 20:21:35 +00002155
Anton Blanchard98382f42011-08-04 14:07:39 +00002156 if (vlen > UIO_MAXIOV)
2157 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002158
2159 datagrams = 0;
2160
2161 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2162 if (!sock)
2163 return err;
2164
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002165 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002166 entry = mmsg;
2167 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002168 err = 0;
Anton Blanchard228e5482011-05-02 20:21:35 +00002169
2170 while (datagrams < vlen) {
Anton Blanchard228e5482011-05-02 20:21:35 +00002171 if (MSG_CMSG_COMPAT & flags) {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002172 err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
2173 &msg_sys, flags, &used_address);
Anton Blanchard228e5482011-05-02 20:21:35 +00002174 if (err < 0)
2175 break;
2176 err = __put_user(err, &compat_entry->msg_len);
2177 ++compat_entry;
2178 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002179 err = ___sys_sendmsg(sock,
2180 (struct msghdr __user *)entry,
2181 &msg_sys, flags, &used_address);
Anton Blanchard228e5482011-05-02 20:21:35 +00002182 if (err < 0)
2183 break;
2184 err = put_user(err, &entry->msg_len);
2185 ++entry;
2186 }
2187
2188 if (err)
2189 break;
2190 ++datagrams;
2191 }
2192
Anton Blanchard228e5482011-05-02 20:21:35 +00002193 fput_light(sock->file, fput_needed);
2194
Anton Blanchard728ffb82011-08-04 14:07:38 +00002195 /* We only return an error if no datagrams were able to be sent */
2196 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002197 return datagrams;
2198
Anton Blanchard228e5482011-05-02 20:21:35 +00002199 return err;
2200}
2201
2202SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2203 unsigned int, vlen, unsigned int, flags)
2204{
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002205 if (flags & MSG_CMSG_COMPAT)
2206 return -EINVAL;
Anton Blanchard228e5482011-05-02 20:21:35 +00002207 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2208}
2209
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002210static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002211 struct msghdr *msg_sys, unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002212{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002213 struct compat_msghdr __user *msg_compat =
2214 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002215 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002216 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002217 unsigned long cmsg_ptr;
Eric Dumazeta74e9102012-04-20 20:04:01 +02002218 int err, total_len, len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002219
2220 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002221 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222
2223 /* user mode address pointers */
2224 struct sockaddr __user *uaddr;
2225 int __user *uaddr_len;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002226
Linus Torvalds1da177e2005-04-16 15:20:36 -07002227 if (MSG_CMSG_COMPAT & flags) {
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002228 if (get_compat_msghdr(msg_sys, msg_compat))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229 return -EFAULT;
Dan Carpenter1661bf32013-10-03 00:27:20 +03002230 } else {
2231 err = copy_msghdr_from_user(msg_sys, msg);
2232 if (err)
2233 return err;
2234 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002235
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002236 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
Eric Dumazeta74e9102012-04-20 20:04:01 +02002237 err = -EMSGSIZE;
2238 if (msg_sys->msg_iovlen > UIO_MAXIOV)
2239 goto out;
2240 err = -ENOMEM;
2241 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
2242 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002243 if (!iov)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002244 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002245 }
2246
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002247 /* Save the user-mode address (verify_iovec will change the
2248 * kernel msghdr to use the kernel address space)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002249 */
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002250 uaddr = (__force void __user *)msg_sys->msg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002251 uaddr_len = COMPAT_NAMELEN(msg);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002252 if (MSG_CMSG_COMPAT & flags)
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002253 err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002254 else
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002255 err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256 if (err < 0)
2257 goto out_freeiov;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002258 total_len = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002259
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002260 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2261 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002262
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002263 /* We assume all kernel code knows the size of sockaddr_storage */
2264 msg_sys->msg_namelen = 0;
2265
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266 if (sock->file->f_flags & O_NONBLOCK)
2267 flags |= MSG_DONTWAIT;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002268 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
2269 total_len, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002270 if (err < 0)
2271 goto out_freeiov;
2272 len = err;
2273
2274 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002275 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002276 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002277 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002278 if (err < 0)
2279 goto out_freeiov;
2280 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002281 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002282 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002283 if (err)
2284 goto out_freeiov;
2285 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002286 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002287 &msg_compat->msg_controllen);
2288 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002289 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290 &msg->msg_controllen);
2291 if (err)
2292 goto out_freeiov;
2293 err = len;
2294
2295out_freeiov:
2296 if (iov != iovstack)
Eric Dumazeta74e9102012-04-20 20:04:01 +02002297 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002298out:
2299 return err;
2300}
2301
2302/*
2303 * BSD recvmsg interface
2304 */
2305
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002306long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002307{
2308 int fput_needed, err;
2309 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002310 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002311
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002312 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002313 if (!sock)
2314 goto out;
2315
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002316 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002317
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002318 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319out:
2320 return err;
2321}
2322
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002323SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
2324 unsigned int, flags)
2325{
2326 if (flags & MSG_CMSG_COMPAT)
2327 return -EINVAL;
2328 return __sys_recvmsg(fd, msg, flags);
2329}
2330
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002331/*
2332 * Linux recvmmsg interface
2333 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002334
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002335int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2336 unsigned int flags, struct timespec *timeout)
2337{
2338 int fput_needed, err, datagrams;
2339 struct socket *sock;
2340 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002341 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002342 struct msghdr msg_sys;
2343 struct timespec end_time;
2344
2345 if (timeout &&
2346 poll_select_set_timeout(&end_time, timeout->tv_sec,
2347 timeout->tv_nsec))
2348 return -EINVAL;
2349
2350 datagrams = 0;
2351
2352 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2353 if (!sock)
2354 return err;
2355
2356 err = sock_error(sock->sk);
2357 if (err)
2358 goto out_put;
2359
2360 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002361 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002362
2363 while (datagrams < vlen) {
2364 /*
2365 * No need to ask LSM for more than the first datagram.
2366 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002367 if (MSG_CMSG_COMPAT & flags) {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002368 err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
2369 &msg_sys, flags & ~MSG_WAITFORONE,
2370 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002371 if (err < 0)
2372 break;
2373 err = __put_user(err, &compat_entry->msg_len);
2374 ++compat_entry;
2375 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002376 err = ___sys_recvmsg(sock,
2377 (struct msghdr __user *)entry,
2378 &msg_sys, flags & ~MSG_WAITFORONE,
2379 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002380 if (err < 0)
2381 break;
2382 err = put_user(err, &entry->msg_len);
2383 ++entry;
2384 }
2385
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002386 if (err)
2387 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002388 ++datagrams;
2389
Brandon L Black71c5c1592010-03-26 16:18:03 +00002390 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2391 if (flags & MSG_WAITFORONE)
2392 flags |= MSG_DONTWAIT;
2393
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002394 if (timeout) {
2395 ktime_get_ts(timeout);
2396 *timeout = timespec_sub(end_time, *timeout);
2397 if (timeout->tv_sec < 0) {
2398 timeout->tv_sec = timeout->tv_nsec = 0;
2399 break;
2400 }
2401
2402 /* Timeout, return less than vlen datagrams */
2403 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2404 break;
2405 }
2406
2407 /* Out of band data, return right away */
2408 if (msg_sys.msg_flags & MSG_OOB)
2409 break;
2410 }
2411
2412out_put:
2413 fput_light(sock->file, fput_needed);
2414
2415 if (err == 0)
2416 return datagrams;
2417
2418 if (datagrams != 0) {
2419 /*
2420 * We may return less entries than requested (vlen) if the
2421 * sock is non block and there aren't enough datagrams...
2422 */
2423 if (err != -EAGAIN) {
2424 /*
2425 * ... or if recvmsg returns an error after we
2426 * received some datagrams, where we record the
2427 * error to return on the next call or if the
2428 * app asks about it using getsockopt(SO_ERROR).
2429 */
2430 sock->sk->sk_err = -err;
2431 }
2432
2433 return datagrams;
2434 }
2435
2436 return err;
2437}
2438
2439SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2440 unsigned int, vlen, unsigned int, flags,
2441 struct timespec __user *, timeout)
2442{
2443 int datagrams;
2444 struct timespec timeout_sys;
2445
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002446 if (flags & MSG_CMSG_COMPAT)
2447 return -EINVAL;
2448
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002449 if (!timeout)
2450 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2451
2452 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2453 return -EFAULT;
2454
2455 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2456
2457 if (datagrams > 0 &&
2458 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2459 datagrams = -EFAULT;
2460
2461 return datagrams;
2462}
2463
2464#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002465/* Argument list sizes for sys_socketcall */
2466#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002467static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002468 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2469 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2470 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002471 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002472};
2473
Linus Torvalds1da177e2005-04-16 15:20:36 -07002474#undef AL
2475
2476/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002477 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002478 *
2479 * Argument checking cleaned up. Saved 20% in size.
2480 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002481 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002482 */
2483
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002484SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002485{
Chen Gang2950fa92013-04-07 16:55:23 +08002486 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002487 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002488 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002489 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002490
Anton Blanchard228e5482011-05-02 20:21:35 +00002491 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002492 return -EINVAL;
2493
Arjan van de Ven47379052009-09-28 12:57:44 -07002494 len = nargs[call];
2495 if (len > sizeof(a))
2496 return -EINVAL;
2497
Linus Torvalds1da177e2005-04-16 15:20:36 -07002498 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002499 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002500 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002501
Chen Gang2950fa92013-04-07 16:55:23 +08002502 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2503 if (err)
2504 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002505
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002506 a0 = a[0];
2507 a1 = a[1];
2508
2509 switch (call) {
2510 case SYS_SOCKET:
2511 err = sys_socket(a0, a1, a[2]);
2512 break;
2513 case SYS_BIND:
2514 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2515 break;
2516 case SYS_CONNECT:
2517 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2518 break;
2519 case SYS_LISTEN:
2520 err = sys_listen(a0, a1);
2521 break;
2522 case SYS_ACCEPT:
Ulrich Drepperde11def2008-11-19 15:36:14 -08002523 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2524 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002525 break;
2526 case SYS_GETSOCKNAME:
2527 err =
2528 sys_getsockname(a0, (struct sockaddr __user *)a1,
2529 (int __user *)a[2]);
2530 break;
2531 case SYS_GETPEERNAME:
2532 err =
2533 sys_getpeername(a0, (struct sockaddr __user *)a1,
2534 (int __user *)a[2]);
2535 break;
2536 case SYS_SOCKETPAIR:
2537 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2538 break;
2539 case SYS_SEND:
2540 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2541 break;
2542 case SYS_SENDTO:
2543 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2544 (struct sockaddr __user *)a[4], a[5]);
2545 break;
2546 case SYS_RECV:
2547 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2548 break;
2549 case SYS_RECVFROM:
2550 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2551 (struct sockaddr __user *)a[4],
2552 (int __user *)a[5]);
2553 break;
2554 case SYS_SHUTDOWN:
2555 err = sys_shutdown(a0, a1);
2556 break;
2557 case SYS_SETSOCKOPT:
2558 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2559 break;
2560 case SYS_GETSOCKOPT:
2561 err =
2562 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2563 (int __user *)a[4]);
2564 break;
2565 case SYS_SENDMSG:
2566 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2567 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002568 case SYS_SENDMMSG:
2569 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2570 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002571 case SYS_RECVMSG:
2572 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2573 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002574 case SYS_RECVMMSG:
2575 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2576 (struct timespec __user *)a[4]);
2577 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002578 case SYS_ACCEPT4:
2579 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2580 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002581 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002582 default:
2583 err = -EINVAL;
2584 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002585 }
2586 return err;
2587}
2588
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002589#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002590
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002591/**
2592 * sock_register - add a socket protocol handler
2593 * @ops: description of protocol
2594 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002595 * This function is called by a protocol handler that wants to
2596 * advertise its address family, and have it linked into the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002597 * socket interface. The value ops->family coresponds to the
2598 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002599 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002600int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002601{
2602 int err;
2603
2604 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08002605 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002606 return -ENOBUFS;
2607 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002608
2609 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002610 if (rcu_dereference_protected(net_families[ops->family],
2611 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002612 err = -EEXIST;
2613 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00002614 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002615 err = 0;
2616 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002617 spin_unlock(&net_family_lock);
2618
Yang Yingliang3410f222014-02-12 17:09:55 +08002619 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002620 return err;
2621}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002622EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002623
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002624/**
2625 * sock_unregister - remove a protocol handler
2626 * @family: protocol family to remove
2627 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002628 * This function is called by a protocol handler that wants to
2629 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002630 * new socket creation.
2631 *
2632 * If protocol handler is a module, then it can use module reference
2633 * counts to protect against new references. If protocol handler is not
2634 * a module then it needs to provide its own protection in
2635 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002636 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002637void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002638{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002639 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002640
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002641 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00002642 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002643 spin_unlock(&net_family_lock);
2644
2645 synchronize_rcu();
2646
Yang Yingliang3410f222014-02-12 17:09:55 +08002647 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002648}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002649EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002650
Andi Kleen77d76ea2005-12-22 12:43:42 -08002651static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002652{
Nick Pigginb3e19d92011-01-07 17:50:11 +11002653 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00002654 /*
2655 * Initialize the network sysctl infrastructure.
2656 */
2657 err = net_sysctl_init();
2658 if (err)
2659 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11002660
Linus Torvalds1da177e2005-04-16 15:20:36 -07002661 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002662 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002663 */
2664 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002665
2666 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002667 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002668 */
2669
2670 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11002671
2672 err = register_filesystem(&sock_fs_type);
2673 if (err)
2674 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002675 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11002676 if (IS_ERR(sock_mnt)) {
2677 err = PTR_ERR(sock_mnt);
2678 goto out_mount;
2679 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08002680
2681 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002682 */
2683
2684#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00002685 err = netfilter_init();
2686 if (err)
2687 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002688#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002689
Daniel Borkmann408eccc2014-04-01 16:20:23 +02002690 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00002691
Nick Pigginb3e19d92011-01-07 17:50:11 +11002692out:
2693 return err;
2694
2695out_mount:
2696 unregister_filesystem(&sock_fs_type);
2697out_fs:
2698 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002699}
2700
Andi Kleen77d76ea2005-12-22 12:43:42 -08002701core_initcall(sock_init); /* early initcall */
2702
Linus Torvalds1da177e2005-04-16 15:20:36 -07002703#ifdef CONFIG_PROC_FS
2704void socket_seq_show(struct seq_file *seq)
2705{
2706 int cpu;
2707 int counter = 0;
2708
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07002709 for_each_possible_cpu(cpu)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002710 counter += per_cpu(sockets_in_use, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002711
2712 /* It can be negative, by the way. 8) */
2713 if (counter < 0)
2714 counter = 0;
2715
2716 seq_printf(seq, "sockets: used %d\n", counter);
2717}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002718#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002719
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002720#ifdef CONFIG_COMPAT
Arnd Bergmann6b960182009-11-06 23:10:54 -08002721static int do_siocgstamp(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002722 unsigned int cmd, void __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002723{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002724 mm_segment_t old_fs = get_fs();
2725 struct timeval ktv;
2726 int err;
2727
2728 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002729 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002730 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002731 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002732 err = compat_put_timeval(&ktv, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002733
Arnd Bergmann7a229382009-11-06 23:00:29 -08002734 return err;
2735}
2736
Arnd Bergmann6b960182009-11-06 23:10:54 -08002737static int do_siocgstampns(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002738 unsigned int cmd, void __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002739{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002740 mm_segment_t old_fs = get_fs();
2741 struct timespec kts;
2742 int err;
2743
2744 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002745 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002746 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002747 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002748 err = compat_put_timespec(&kts, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002749
Arnd Bergmann7a229382009-11-06 23:00:29 -08002750 return err;
2751}
2752
Arnd Bergmann6b960182009-11-06 23:10:54 -08002753static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002754{
2755 struct ifreq __user *uifr;
2756 int err;
2757
2758 uifr = compat_alloc_user_space(sizeof(struct ifreq));
Arnd Bergmann6b960182009-11-06 23:10:54 -08002759 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002760 return -EFAULT;
2761
Arnd Bergmann6b960182009-11-06 23:10:54 -08002762 err = dev_ioctl(net, SIOCGIFNAME, uifr);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002763 if (err)
2764 return err;
2765
Arnd Bergmann6b960182009-11-06 23:10:54 -08002766 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002767 return -EFAULT;
2768
2769 return 0;
2770}
2771
Arnd Bergmann6b960182009-11-06 23:10:54 -08002772static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002773{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002774 struct compat_ifconf ifc32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002775 struct ifconf ifc;
2776 struct ifconf __user *uifc;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002777 struct compat_ifreq __user *ifr32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002778 struct ifreq __user *ifr;
2779 unsigned int i, j;
2780 int err;
2781
Arnd Bergmann6b960182009-11-06 23:10:54 -08002782 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002783 return -EFAULT;
2784
Mathias Krause43da5f22012-08-15 11:31:57 +00002785 memset(&ifc, 0, sizeof(ifc));
Arnd Bergmann7a229382009-11-06 23:00:29 -08002786 if (ifc32.ifcbuf == 0) {
2787 ifc32.ifc_len = 0;
2788 ifc.ifc_len = 0;
2789 ifc.ifc_req = NULL;
2790 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2791 } else {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002792 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2793 sizeof(struct ifreq);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002794 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2795 ifc.ifc_len = len;
2796 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2797 ifr32 = compat_ptr(ifc32.ifcbuf);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002798 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
Arnd Bergmann6b960182009-11-06 23:10:54 -08002799 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002800 return -EFAULT;
2801 ifr++;
2802 ifr32++;
2803 }
2804 }
2805 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2806 return -EFAULT;
2807
Arnd Bergmann6b960182009-11-06 23:10:54 -08002808 err = dev_ioctl(net, SIOCGIFCONF, uifc);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002809 if (err)
2810 return err;
2811
2812 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2813 return -EFAULT;
2814
2815 ifr = ifc.ifc_req;
2816 ifr32 = compat_ptr(ifc32.ifcbuf);
2817 for (i = 0, j = 0;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002818 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2819 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2820 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002821 return -EFAULT;
2822 ifr32++;
2823 ifr++;
2824 }
2825
2826 if (ifc32.ifcbuf == 0) {
2827 /* Translate from 64-bit structure multiple to
2828 * a 32-bit one.
2829 */
2830 i = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002831 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
Arnd Bergmann7a229382009-11-06 23:00:29 -08002832 ifc32.ifc_len = i;
2833 } else {
2834 ifc32.ifc_len = i;
2835 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08002836 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002837 return -EFAULT;
2838
2839 return 0;
2840}
2841
Arnd Bergmann6b960182009-11-06 23:10:54 -08002842static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002843{
Ben Hutchings3a7da392011-03-17 07:34:32 +00002844 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2845 bool convert_in = false, convert_out = false;
2846 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2847 struct ethtool_rxnfc __user *rxnfc;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002848 struct ifreq __user *ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002849 u32 rule_cnt = 0, actual_rule_cnt;
2850 u32 ethcmd;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002851 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002852 int ret;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002853
2854 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2855 return -EFAULT;
2856
Ben Hutchings3a7da392011-03-17 07:34:32 +00002857 compat_rxnfc = compat_ptr(data);
2858
2859 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002860 return -EFAULT;
2861
Ben Hutchings3a7da392011-03-17 07:34:32 +00002862 /* Most ethtool structures are defined without padding.
2863 * Unfortunately struct ethtool_rxnfc is an exception.
2864 */
2865 switch (ethcmd) {
2866 default:
2867 break;
2868 case ETHTOOL_GRXCLSRLALL:
2869 /* Buffer size is variable */
2870 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2871 return -EFAULT;
2872 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2873 return -ENOMEM;
2874 buf_size += rule_cnt * sizeof(u32);
2875 /* fall through */
2876 case ETHTOOL_GRXRINGS:
2877 case ETHTOOL_GRXCLSRLCNT:
2878 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00002879 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002880 convert_out = true;
2881 /* fall through */
2882 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002883 buf_size += sizeof(struct ethtool_rxnfc);
2884 convert_in = true;
2885 break;
2886 }
2887
2888 ifr = compat_alloc_user_space(buf_size);
Stephen Hemminger954b1242013-02-11 06:22:28 +00002889 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
Ben Hutchings3a7da392011-03-17 07:34:32 +00002890
2891 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2892 return -EFAULT;
2893
2894 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2895 &ifr->ifr_ifru.ifru_data))
2896 return -EFAULT;
2897
2898 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00002899 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00002900 * fs.ring_cookie and at the end of fs, but nowhere else.
2901 */
Alexander Duyck127fe532011-04-08 18:01:59 +00002902 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2903 sizeof(compat_rxnfc->fs.m_ext) !=
2904 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2905 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00002906 BUILD_BUG_ON(
2907 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2908 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2909 offsetof(struct ethtool_rxnfc, fs.location) -
2910 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2911
2912 if (copy_in_user(rxnfc, compat_rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002913 (void __user *)(&rxnfc->fs.m_ext + 1) -
2914 (void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002915 copy_in_user(&rxnfc->fs.ring_cookie,
2916 &compat_rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002917 (void __user *)(&rxnfc->fs.location + 1) -
2918 (void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002919 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2920 sizeof(rxnfc->rule_cnt)))
2921 return -EFAULT;
2922 }
2923
2924 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2925 if (ret)
2926 return ret;
2927
2928 if (convert_out) {
2929 if (copy_in_user(compat_rxnfc, rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002930 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2931 (const void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002932 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2933 &rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002934 (const void __user *)(&rxnfc->fs.location + 1) -
2935 (const void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002936 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2937 sizeof(rxnfc->rule_cnt)))
2938 return -EFAULT;
2939
2940 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2941 /* As an optimisation, we only copy the actual
2942 * number of rules that the underlying
2943 * function returned. Since Mallory might
2944 * change the rule count in user memory, we
2945 * check that it is less than the rule count
2946 * originally given (as the user buffer size),
2947 * which has been range-checked.
2948 */
2949 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2950 return -EFAULT;
2951 if (actual_rule_cnt < rule_cnt)
2952 rule_cnt = actual_rule_cnt;
2953 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2954 &rxnfc->rule_locs[0],
2955 rule_cnt * sizeof(u32)))
2956 return -EFAULT;
2957 }
2958 }
2959
2960 return 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002961}
2962
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002963static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2964{
2965 void __user *uptr;
2966 compat_uptr_t uptr32;
2967 struct ifreq __user *uifr;
2968
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002969 uifr = compat_alloc_user_space(sizeof(*uifr));
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002970 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2971 return -EFAULT;
2972
2973 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2974 return -EFAULT;
2975
2976 uptr = compat_ptr(uptr32);
2977
2978 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2979 return -EFAULT;
2980
2981 return dev_ioctl(net, SIOCWANDEV, uifr);
2982}
2983
Arnd Bergmann6b960182009-11-06 23:10:54 -08002984static int bond_ioctl(struct net *net, unsigned int cmd,
2985 struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002986{
2987 struct ifreq kifr;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002988 mm_segment_t old_fs;
2989 int err;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002990
2991 switch (cmd) {
2992 case SIOCBONDENSLAVE:
2993 case SIOCBONDRELEASE:
2994 case SIOCBONDSETHWADDR:
2995 case SIOCBONDCHANGEACTIVE:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002996 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002997 return -EFAULT;
2998
2999 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003000 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003001 err = dev_ioctl(net, cmd,
3002 (struct ifreq __user __force *) &kifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003003 set_fs(old_fs);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003004
3005 return err;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003006 default:
Linus Torvalds07d106d2012-01-05 15:40:12 -08003007 return -ENOIOCTLCMD;
Joe Perchesccbd6a52010-05-14 10:58:26 +00003008 }
Arnd Bergmann7a229382009-11-06 23:00:29 -08003009}
3010
Ben Hutchings590d4692013-11-18 17:04:13 +00003011/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3012static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08003013 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003014{
3015 struct ifreq __user *u_ifreq64;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003016 char tmp_buf[IFNAMSIZ];
3017 void __user *data64;
3018 u32 data32;
3019
3020 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
3021 IFNAMSIZ))
3022 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00003023 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003024 return -EFAULT;
3025 data64 = compat_ptr(data32);
3026
3027 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
3028
Arnd Bergmann7a229382009-11-06 23:00:29 -08003029 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
3030 IFNAMSIZ))
3031 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00003032 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003033 return -EFAULT;
3034
Arnd Bergmann6b960182009-11-06 23:10:54 -08003035 return dev_ioctl(net, cmd, u_ifreq64);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003036}
3037
Arnd Bergmann6b960182009-11-06 23:10:54 -08003038static int dev_ifsioc(struct net *net, struct socket *sock,
3039 unsigned int cmd, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003040{
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003041 struct ifreq __user *uifr;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003042 int err;
3043
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003044 uifr = compat_alloc_user_space(sizeof(*uifr));
3045 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
3046 return -EFAULT;
3047
3048 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
3049
Arnd Bergmann7a229382009-11-06 23:00:29 -08003050 if (!err) {
3051 switch (cmd) {
3052 case SIOCGIFFLAGS:
3053 case SIOCGIFMETRIC:
3054 case SIOCGIFMTU:
3055 case SIOCGIFMEM:
3056 case SIOCGIFHWADDR:
3057 case SIOCGIFINDEX:
3058 case SIOCGIFADDR:
3059 case SIOCGIFBRDADDR:
3060 case SIOCGIFDSTADDR:
3061 case SIOCGIFNETMASK:
Arnd Bergmannfab25322009-11-08 20:56:21 -08003062 case SIOCGIFPFLAGS:
Arnd Bergmann7a229382009-11-06 23:00:29 -08003063 case SIOCGIFTXQLEN:
Arnd Bergmannfab25322009-11-08 20:56:21 -08003064 case SIOCGMIIPHY:
3065 case SIOCGMIIREG:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003066 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003067 err = -EFAULT;
3068 break;
3069 }
3070 }
3071 return err;
3072}
3073
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003074static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
3075 struct compat_ifreq __user *uifr32)
3076{
3077 struct ifreq ifr;
3078 struct compat_ifmap __user *uifmap32;
3079 mm_segment_t old_fs;
3080 int err;
3081
3082 uifmap32 = &uifr32->ifr_ifru.ifru_map;
3083 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003084 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3085 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3086 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3087 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
3088 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
3089 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003090 if (err)
3091 return -EFAULT;
3092
3093 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003094 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003095 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003096 set_fs(old_fs);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003097
3098 if (cmd == SIOCGIFMAP && !err) {
3099 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003100 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3101 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3102 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3103 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
3104 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
3105 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003106 if (err)
3107 err = -EFAULT;
3108 }
3109 return err;
3110}
3111
Arnd Bergmann7a229382009-11-06 23:00:29 -08003112struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003113 u32 rt_pad1;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003114 struct sockaddr rt_dst; /* target address */
3115 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3116 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003117 unsigned short rt_flags;
3118 short rt_pad2;
3119 u32 rt_pad3;
3120 unsigned char rt_tos;
3121 unsigned char rt_class;
3122 short rt_pad4;
3123 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003124 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003125 u32 rt_mtu; /* per route MTU/Window */
3126 u32 rt_window; /* Window clamping */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003127 unsigned short rt_irtt; /* Initial RTT */
3128};
3129
3130struct in6_rtmsg32 {
3131 struct in6_addr rtmsg_dst;
3132 struct in6_addr rtmsg_src;
3133 struct in6_addr rtmsg_gateway;
3134 u32 rtmsg_type;
3135 u16 rtmsg_dst_len;
3136 u16 rtmsg_src_len;
3137 u32 rtmsg_metric;
3138 u32 rtmsg_info;
3139 u32 rtmsg_flags;
3140 s32 rtmsg_ifindex;
3141};
3142
Arnd Bergmann6b960182009-11-06 23:10:54 -08003143static int routing_ioctl(struct net *net, struct socket *sock,
3144 unsigned int cmd, void __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003145{
3146 int ret;
3147 void *r = NULL;
3148 struct in6_rtmsg r6;
3149 struct rtentry r4;
3150 char devname[16];
3151 u32 rtdev;
3152 mm_segment_t old_fs = get_fs();
3153
Arnd Bergmann6b960182009-11-06 23:10:54 -08003154 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3155 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003156 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003157 3 * sizeof(struct in6_addr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003158 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3159 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3160 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3161 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3162 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3163 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3164 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003165
3166 r = (void *) &r6;
3167 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003168 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003169 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003170 3 * sizeof(struct sockaddr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003171 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3172 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3173 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3174 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3175 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3176 ret |= get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003177 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003178 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003179 r4.rt_dev = (char __user __force *)devname;
3180 devname[15] = 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003181 } else
3182 r4.rt_dev = NULL;
3183
3184 r = (void *) &r4;
3185 }
3186
3187 if (ret) {
3188 ret = -EFAULT;
3189 goto out;
3190 }
3191
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003192 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003193 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003194 set_fs(old_fs);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003195
3196out:
Arnd Bergmann7a229382009-11-06 23:00:29 -08003197 return ret;
3198}
3199
3200/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3201 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003202 * use compatible ioctls
Arnd Bergmann7a229382009-11-06 23:00:29 -08003203 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003204static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003205{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003206 compat_ulong_t tmp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003207
Arnd Bergmann6b960182009-11-06 23:10:54 -08003208 if (get_user(tmp, argp))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003209 return -EFAULT;
3210 if (tmp == BRCTL_GET_VERSION)
3211 return BRCTL_VERSION + 1;
3212 return -EINVAL;
3213}
3214
Arnd Bergmann6b960182009-11-06 23:10:54 -08003215static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3216 unsigned int cmd, unsigned long arg)
3217{
3218 void __user *argp = compat_ptr(arg);
3219 struct sock *sk = sock->sk;
3220 struct net *net = sock_net(sk);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003221
Arnd Bergmann6b960182009-11-06 23:10:54 -08003222 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003223 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003224
Arnd Bergmann6b960182009-11-06 23:10:54 -08003225 switch (cmd) {
3226 case SIOCSIFBR:
3227 case SIOCGIFBR:
3228 return old_bridge_ioctl(argp);
3229 case SIOCGIFNAME:
3230 return dev_ifname32(net, argp);
3231 case SIOCGIFCONF:
3232 return dev_ifconf(net, argp);
3233 case SIOCETHTOOL:
3234 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003235 case SIOCWANDEV:
3236 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003237 case SIOCGIFMAP:
3238 case SIOCSIFMAP:
3239 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003240 case SIOCBONDENSLAVE:
3241 case SIOCBONDRELEASE:
3242 case SIOCBONDSETHWADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003243 case SIOCBONDCHANGEACTIVE:
3244 return bond_ioctl(net, cmd, argp);
3245 case SIOCADDRT:
3246 case SIOCDELRT:
3247 return routing_ioctl(net, sock, cmd, argp);
3248 case SIOCGSTAMP:
3249 return do_siocgstamp(net, sock, cmd, argp);
3250 case SIOCGSTAMPNS:
3251 return do_siocgstampns(net, sock, cmd, argp);
Ben Hutchings590d4692013-11-18 17:04:13 +00003252 case SIOCBONDSLAVEINFOQUERY:
3253 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003254 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003255 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003256 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003257
Arnd Bergmann6b960182009-11-06 23:10:54 -08003258 case FIOSETOWN:
3259 case SIOCSPGRP:
3260 case FIOGETOWN:
3261 case SIOCGPGRP:
3262 case SIOCBRADDBR:
3263 case SIOCBRDELBR:
3264 case SIOCGIFVLAN:
3265 case SIOCSIFVLAN:
3266 case SIOCADDDLCI:
3267 case SIOCDELDLCI:
3268 return sock_ioctl(file, cmd, arg);
3269
3270 case SIOCGIFFLAGS:
3271 case SIOCSIFFLAGS:
3272 case SIOCGIFMETRIC:
3273 case SIOCSIFMETRIC:
3274 case SIOCGIFMTU:
3275 case SIOCSIFMTU:
3276 case SIOCGIFMEM:
3277 case SIOCSIFMEM:
3278 case SIOCGIFHWADDR:
3279 case SIOCSIFHWADDR:
3280 case SIOCADDMULTI:
3281 case SIOCDELMULTI:
3282 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003283 case SIOCGIFADDR:
3284 case SIOCSIFADDR:
3285 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003286 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003287 case SIOCGIFBRDADDR:
3288 case SIOCSIFBRDADDR:
3289 case SIOCGIFDSTADDR:
3290 case SIOCSIFDSTADDR:
3291 case SIOCGIFNETMASK:
3292 case SIOCSIFNETMASK:
3293 case SIOCSIFPFLAGS:
3294 case SIOCGIFPFLAGS:
3295 case SIOCGIFTXQLEN:
3296 case SIOCSIFTXQLEN:
3297 case SIOCBRADDIF:
3298 case SIOCBRDELIF:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003299 case SIOCSIFNAME:
3300 case SIOCGMIIPHY:
3301 case SIOCGMIIREG:
3302 case SIOCSMIIREG:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003303 return dev_ifsioc(net, sock, cmd, argp);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003304
Arnd Bergmann6b960182009-11-06 23:10:54 -08003305 case SIOCSARP:
3306 case SIOCGARP:
3307 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003308 case SIOCATMARK:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003309 return sock_do_ioctl(net, sock, cmd, arg);
3310 }
3311
Arnd Bergmann6b960182009-11-06 23:10:54 -08003312 return -ENOIOCTLCMD;
3313}
Arnd Bergmann7a229382009-11-06 23:00:29 -08003314
Eric Dumazet95c96172012-04-15 05:58:06 +00003315static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003316 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003317{
3318 struct socket *sock = file->private_data;
3319 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003320 struct sock *sk;
3321 struct net *net;
3322
3323 sk = sock->sk;
3324 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003325
3326 if (sock->ops->compat_ioctl)
3327 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3328
David S. Miller87de87d2008-06-03 09:14:03 -07003329 if (ret == -ENOIOCTLCMD &&
3330 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3331 ret = compat_wext_handle_ioctl(net, cmd, arg);
3332
Arnd Bergmann6b960182009-11-06 23:10:54 -08003333 if (ret == -ENOIOCTLCMD)
3334 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3335
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003336 return ret;
3337}
3338#endif
3339
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003340int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3341{
3342 return sock->ops->bind(sock, addr, addrlen);
3343}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003344EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003345
3346int kernel_listen(struct socket *sock, int backlog)
3347{
3348 return sock->ops->listen(sock, backlog);
3349}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003350EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003351
3352int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3353{
3354 struct sock *sk = sock->sk;
3355 int err;
3356
3357 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3358 newsock);
3359 if (err < 0)
3360 goto done;
3361
3362 err = sock->ops->accept(sock, *newsock, flags);
3363 if (err < 0) {
3364 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003365 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003366 goto done;
3367 }
3368
3369 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003370 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003371
3372done:
3373 return err;
3374}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003375EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003376
3377int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003378 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003379{
3380 return sock->ops->connect(sock, addr, addrlen, flags);
3381}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003382EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003383
3384int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3385 int *addrlen)
3386{
3387 return sock->ops->getname(sock, addr, addrlen, 0);
3388}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003389EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003390
3391int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3392 int *addrlen)
3393{
3394 return sock->ops->getname(sock, addr, addrlen, 1);
3395}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003396EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003397
3398int kernel_getsockopt(struct socket *sock, int level, int optname,
3399 char *optval, int *optlen)
3400{
3401 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003402 char __user *uoptval;
3403 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003404 int err;
3405
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003406 uoptval = (char __user __force *) optval;
3407 uoptlen = (int __user __force *) optlen;
3408
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003409 set_fs(KERNEL_DS);
3410 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003411 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003412 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003413 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3414 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003415 set_fs(oldfs);
3416 return err;
3417}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003418EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003419
3420int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003421 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003422{
3423 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003424 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003425 int err;
3426
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003427 uoptval = (char __user __force *) optval;
3428
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003429 set_fs(KERNEL_DS);
3430 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003431 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003432 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003433 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003434 optlen);
3435 set_fs(oldfs);
3436 return err;
3437}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003438EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003439
3440int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3441 size_t size, int flags)
3442{
3443 if (sock->ops->sendpage)
3444 return sock->ops->sendpage(sock, page, offset, size, flags);
3445
3446 return sock_no_sendpage(sock, page, offset, size, flags);
3447}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003448EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003449
3450int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3451{
3452 mm_segment_t oldfs = get_fs();
3453 int err;
3454
3455 set_fs(KERNEL_DS);
3456 err = sock->ops->ioctl(sock, cmd, arg);
3457 set_fs(oldfs);
3458
3459 return err;
3460}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003461EXPORT_SYMBOL(kernel_sock_ioctl);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003462
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003463int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3464{
3465 return sock->ops->shutdown(sock, how);
3466}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003467EXPORT_SYMBOL(kernel_sock_shutdown);