blob: 1b1e7e6a960faae2bf7e4aa2625a2cebc2d49a20 [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>
Eliezer Tamir06021292013-06-10 11:39:50 +0300109
Cong Wange0d10952013-08-01 11:10:25 +0800110#ifdef CONFIG_NET_RX_BUSY_POLL
Eliezer Tamir64b0dc52013-07-10 17:13:36 +0300111unsigned int sysctl_net_busy_read __read_mostly;
112unsigned int sysctl_net_busy_poll __read_mostly;
Eliezer Tamir06021292013-06-10 11:39:50 +0300113#endif
Arnd Bergmann6b960182009-11-06 23:10:54 -0800114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
Badari Pulavarty027445c2006-09-30 23:28:46 -0700116static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
117 unsigned long nr_segs, loff_t pos);
118static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
119 unsigned long nr_segs, loff_t pos);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700120static int sock_mmap(struct file *file, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122static int sock_close(struct inode *inode, struct file *file);
123static unsigned int sock_poll(struct file *file,
124 struct poll_table_struct *wait);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700125static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800126#ifdef CONFIG_COMPAT
127static long compat_sock_ioctl(struct file *file,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700128 unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800129#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130static int sock_fasync(int fd, struct file *filp, int on);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131static ssize_t sock_sendpage(struct file *file, struct page *page,
132 int offset, size_t size, loff_t *ppos, int more);
Jens Axboe9c55e012007-11-06 23:30:13 -0800133static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700134 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800135 unsigned int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137/*
138 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
139 * in the operation structures but are done directly via the socketcall() multiplexor.
140 */
141
Arjan van de Venda7071d2007-02-12 00:55:36 -0800142static const struct file_operations socket_file_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 .owner = THIS_MODULE,
144 .llseek = no_llseek,
145 .aio_read = sock_aio_read,
146 .aio_write = sock_aio_write,
147 .poll = sock_poll,
148 .unlocked_ioctl = sock_ioctl,
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800149#ifdef CONFIG_COMPAT
150 .compat_ioctl = compat_sock_ioctl,
151#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 .mmap = sock_mmap,
153 .open = sock_no_open, /* special open code to disallow open via /proc */
154 .release = sock_close,
155 .fasync = sock_fasync,
Jens Axboe5274f052006-03-30 15:15:30 +0200156 .sendpage = sock_sendpage,
157 .splice_write = generic_splice_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800158 .splice_read = sock_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159};
160
161/*
162 * The protocol list. Each protocol is registered in here.
163 */
164
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165static DEFINE_SPINLOCK(net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +0000166static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168/*
169 * Statistics counters of the socket lists
170 */
171
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700172static DEFINE_PER_CPU(int, sockets_in_use);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
174/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700175 * Support routines.
176 * Move socket addresses back and forth across the kernel/user
177 * divide and look after the messy bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 */
179
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180/**
181 * move_addr_to_kernel - copy a socket address into kernel space
182 * @uaddr: Address in user space
183 * @kaddr: Address in kernel space
184 * @ulen: Length in user space
185 *
186 * The address is copied into kernel space. If the provided address is
187 * too long an error code of -EINVAL is returned. If the copy gives
188 * invalid addresses -EFAULT is returned. On a success 0 is returned.
189 */
190
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000191int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700193 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700195 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700197 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100199 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200}
201
202/**
203 * move_addr_to_user - copy an address to user space
204 * @kaddr: kernel space address
205 * @klen: length of address in kernel
206 * @uaddr: user space address
207 * @ulen: pointer to user length field
208 *
209 * The value pointed to by ulen on entry is the buffer length available.
210 * This is overwritten with the buffer space used. -EINVAL is returned
211 * if an overlong buffer is specified or a negative buffer size. -EFAULT
212 * is returned if either the buffer or the length field are not
213 * accessible.
214 * After copying the data up to the limit the user specifies, the true
215 * length of the data is written over the length limit the user
216 * specified. Zero is returned for a success.
217 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700218
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000219static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
stephen hemminger11165f12010-10-18 14:27:29 +0000220 void __user *uaddr, int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221{
222 int err;
223 int len;
224
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100225 BUG_ON(klen > sizeof(struct sockaddr_storage));
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700226 err = get_user(len, ulen);
227 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700229 if (len > klen)
230 len = klen;
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100231 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700233 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500234 if (audit_sockaddr(klen, kaddr))
235 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700236 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 return -EFAULT;
238 }
239 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700240 * "fromlen shall refer to the value before truncation.."
241 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 */
243 return __put_user(klen, ulen);
244}
245
Christoph Lametere18b8902006-12-06 20:33:20 -0800246static struct kmem_cache *sock_inode_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
248static struct inode *sock_alloc_inode(struct super_block *sb)
249{
250 struct socket_alloc *ei;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000251 struct socket_wq *wq;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700252
Christoph Lametere94b1762006-12-06 20:33:17 -0800253 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 if (!ei)
255 return NULL;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000256 wq = kmalloc(sizeof(*wq), GFP_KERNEL);
257 if (!wq) {
Eric Dumazet43815482010-04-29 11:01:49 +0000258 kmem_cache_free(sock_inode_cachep, ei);
259 return NULL;
260 }
Eric Dumazeteaefd112011-02-18 03:26:36 +0000261 init_waitqueue_head(&wq->wait);
262 wq->fasync_list = NULL;
263 RCU_INIT_POINTER(ei->socket.wq, wq);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 ei->socket.state = SS_UNCONNECTED;
266 ei->socket.flags = 0;
267 ei->socket.ops = NULL;
268 ei->socket.sk = NULL;
269 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 return &ei->vfs_inode;
272}
273
274static void sock_destroy_inode(struct inode *inode)
275{
Eric Dumazet43815482010-04-29 11:01:49 +0000276 struct socket_alloc *ei;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000277 struct socket_wq *wq;
Eric Dumazet43815482010-04-29 11:01:49 +0000278
279 ei = container_of(inode, struct socket_alloc, vfs_inode);
Eric Dumazeteaefd112011-02-18 03:26:36 +0000280 wq = rcu_dereference_protected(ei->socket.wq, 1);
Lai Jiangshan61845222011-03-18 12:10:25 +0800281 kfree_rcu(wq, rcu);
Eric Dumazet43815482010-04-29 11:01:49 +0000282 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700285static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700287 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Christoph Lametera35afb82007-05-16 22:10:57 -0700289 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292static int init_inodecache(void)
293{
294 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700295 sizeof(struct socket_alloc),
296 0,
297 (SLAB_HWCACHE_ALIGN |
298 SLAB_RECLAIM_ACCOUNT |
299 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900300 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 if (sock_inode_cachep == NULL)
302 return -ENOMEM;
303 return 0;
304}
305
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700306static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700307 .alloc_inode = sock_alloc_inode,
308 .destroy_inode = sock_destroy_inode,
309 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310};
311
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700312/*
313 * sockfs_dname() is called from d_path().
314 */
315static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
316{
317 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
318 dentry->d_inode->i_ino);
319}
320
Al Viro3ba13d12009-02-20 06:02:22 +0000321static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700322 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323};
324
Al Viroc74a1cb2011-01-12 16:59:34 -0500325static struct dentry *sockfs_mount(struct file_system_type *fs_type,
326 int flags, const char *dev_name, void *data)
327{
328 return mount_pseudo(fs_type, "socket:", &sockfs_ops,
329 &sockfs_dentry_operations, SOCKFS_MAGIC);
330}
331
332static struct vfsmount *sock_mnt __read_mostly;
333
334static struct file_system_type sock_fs_type = {
335 .name = "sockfs",
336 .mount = sockfs_mount,
337 .kill_sb = kill_anon_super,
338};
339
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340/*
341 * Obtains the first available file descriptor and sets it up for use.
342 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800343 * These functions create file structures and maps them to fd space
344 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 * and file struct implicitly stored in sock->file.
346 * Note that another thread may close file descriptor before we return
347 * from this function. We use the fact that now we do not refer
348 * to socket after mapping. If one day we will need it, this
349 * function will increment ref. count on file by 1.
350 *
351 * In any case returned fd MAY BE not valid!
352 * This race condition is unavoidable
353 * with shared fd spaces, we cannot solve it inside kernel,
354 * but we take care of internal coherence yet.
355 */
356
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700357struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358{
Al Viro7cbe66b2009-08-05 19:59:08 +0400359 struct qstr name = { .name = "" };
Al Viro2c48b9c2009-08-09 00:52:35 +0400360 struct path path;
Al Viro7cbe66b2009-08-05 19:59:08 +0400361 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800362
Masatake YAMATO600e1772012-08-29 10:44:29 +0000363 if (dname) {
364 name.name = dname;
365 name.len = strlen(name.name);
366 } else if (sock->sk) {
367 name.name = sock->sk->sk_prot_creator->name;
368 name.len = strlen(name.name);
369 }
Nick Piggin4b936882011-01-07 17:50:07 +1100370 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
Al Viro28407632012-08-17 23:54:15 -0400371 if (unlikely(!path.dentry))
372 return ERR_PTR(-ENOMEM);
Al Viro2c48b9c2009-08-09 00:52:35 +0400373 path.mnt = mntget(sock_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
Al Viro2c48b9c2009-08-09 00:52:35 +0400375 d_instantiate(path.dentry, SOCK_INODE(sock));
Al Virocc3808f2009-08-06 09:43:59 +0400376 SOCK_INODE(sock)->i_fop = &socket_file_ops;
377
Al Viro2c48b9c2009-08-09 00:52:35 +0400378 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
Al Virocc3808f2009-08-06 09:43:59 +0400379 &socket_file_ops);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700380 if (unlikely(IS_ERR(file))) {
Al Virocc3808f2009-08-06 09:43:59 +0400381 /* drop dentry, keep inode */
Al Viro7de9c6ee2010-10-23 11:11:40 -0400382 ihold(path.dentry->d_inode);
Al Viro2c48b9c2009-08-09 00:52:35 +0400383 path_put(&path);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700384 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400385 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800386
387 sock->file = file;
Ulrich Drepper77d27202008-07-23 21:29:35 -0700388 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800389 file->private_data = sock;
Al Viro28407632012-08-17 23:54:15 -0400390 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800391}
Al Viro56b31d12012-08-18 00:25:51 -0400392EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800393
Al Viro56b31d12012-08-18 00:25:51 -0400394static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800395{
396 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400397 int fd = get_unused_fd_flags(flags);
398 if (unlikely(fd < 0))
399 return fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800400
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700401 newfile = sock_alloc_file(sock, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -0400402 if (likely(!IS_ERR(newfile))) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800403 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400404 return fd;
405 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400406
Al Viro28407632012-08-17 23:54:15 -0400407 put_unused_fd(fd);
408 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409}
410
John Fastabend406a3c62012-07-20 10:39:25 +0000411struct socket *sock_from_file(struct file *file, int *err)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800412{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800413 if (file->f_op == &socket_file_ops)
414 return file->private_data; /* set in sock_map_fd */
415
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800416 *err = -ENOTSOCK;
417 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800418}
John Fastabend406a3c62012-07-20 10:39:25 +0000419EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800420
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700422 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 * @fd: file handle
424 * @err: pointer to an error code return
425 *
426 * The file handle passed in is locked and the socket it is bound
427 * too is returned. If an error occurs the err pointer is overwritten
428 * with a negative errno code and NULL is returned. The function checks
429 * for both invalid handles and passing a handle which is not a socket.
430 *
431 * On a success the socket object pointer is returned.
432 */
433
434struct socket *sockfd_lookup(int fd, int *err)
435{
436 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 struct socket *sock;
438
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700439 file = fget(fd);
440 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 *err = -EBADF;
442 return NULL;
443 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700444
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800445 sock = sock_from_file(file, err);
446 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 return sock;
449}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700450EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800452static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
453{
Al Viro00e188e2014-03-03 23:48:18 -0500454 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800455 struct socket *sock;
456
Hua Zhong36725582006-04-19 15:25:02 -0700457 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500458 if (f.file) {
459 sock = sock_from_file(f.file, err);
460 if (likely(sock)) {
461 *fput_needed = f.flags;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800462 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500463 }
464 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800465 }
466 return NULL;
467}
468
Masatake YAMATO600e1772012-08-29 10:44:29 +0000469#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
470#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
471#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
472static ssize_t sockfs_getxattr(struct dentry *dentry,
473 const char *name, void *value, size_t size)
474{
475 const char *proto_name;
476 size_t proto_size;
477 int error;
478
479 error = -ENODATA;
480 if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) {
481 proto_name = dentry->d_name.name;
482 proto_size = strlen(proto_name);
483
484 if (value) {
485 error = -ERANGE;
486 if (proto_size + 1 > size)
487 goto out;
488
489 strncpy(value, proto_name, proto_size + 1);
490 }
491 error = proto_size + 1;
492 }
493
494out:
495 return error;
496}
497
498static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
499 size_t size)
500{
501 ssize_t len;
502 ssize_t used = 0;
503
504 len = security_inode_listsecurity(dentry->d_inode, buffer, size);
505 if (len < 0)
506 return len;
507 used += len;
508 if (buffer) {
509 if (size < used)
510 return -ERANGE;
511 buffer += len;
512 }
513
514 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
515 used += len;
516 if (buffer) {
517 if (size < used)
518 return -ERANGE;
519 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
520 buffer += len;
521 }
522
523 return used;
524}
525
526static const struct inode_operations sockfs_inode_ops = {
527 .getxattr = sockfs_getxattr,
528 .listxattr = sockfs_listxattr,
529};
530
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531/**
532 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700533 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 * Allocate a new inode and socket object. The two are bound together
535 * and initialised. The socket is then returned. If we are out of inodes
536 * NULL is returned.
537 */
538
539static struct socket *sock_alloc(void)
540{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700541 struct inode *inode;
542 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200544 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 if (!inode)
546 return NULL;
547
548 sock = SOCKET_I(inode);
549
Eric Dumazet29a020d2009-09-15 02:39:20 -0700550 kmemcheck_annotate_bitfield(sock, type);
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400551 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700552 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100553 inode->i_uid = current_fsuid();
554 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000555 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
Alex Shi19e8d692012-05-14 14:15:31 -0700557 this_cpu_add(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 return sock;
559}
560
561/*
562 * In theory you can't get an open on this inode, but /proc provides
563 * a back door. Remember to keep it shut otherwise you'll let the
564 * creepy crawlies in.
565 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700566
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
568{
569 return -ENXIO;
570}
571
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800572const struct file_operations bad_sock_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 .owner = THIS_MODULE,
574 .open = sock_no_open,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200575 .llseek = noop_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576};
577
578/**
579 * sock_release - close a socket
580 * @sock: socket to close
581 *
582 * The socket is released from the protocol stack if it has a release
583 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700584 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700586
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587void sock_release(struct socket *sock)
588{
589 if (sock->ops) {
590 struct module *owner = sock->ops->owner;
591
592 sock->ops->release(sock);
593 sock->ops = NULL;
594 module_put(owner);
595 }
596
Eric Dumazeteaefd112011-02-18 03:26:36 +0000597 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800598 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
Mikulas Patockab09e7862012-07-19 06:13:36 +0000600 if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
601 return;
602
Alex Shi19e8d692012-05-14 14:15:31 -0700603 this_cpu_sub(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 if (!sock->file) {
605 iput(SOCK_INODE(sock));
606 return;
607 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700608 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700610EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
Daniel Borkmannbf84a012013-04-14 08:08:13 +0000612void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000613{
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000614 *tx_flags = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000615 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000616 *tx_flags |= SKBTX_HW_TSTAMP;
Patrick Ohly20d49472009-02-12 05:03:38 +0000617 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
Oliver Hartkopp2244d072010-08-17 08:59:14 +0000618 *tx_flags |= SKBTX_SW_TSTAMP;
Johannes Berg6e3e9392011-11-09 10:15:42 +0100619 if (sock_flag(sk, SOCK_WIFI_STATUS))
620 *tx_flags |= SKBTX_WIFI_STATUS;
Patrick Ohly20d49472009-02-12 05:03:38 +0000621}
622EXPORT_SYMBOL(sock_tx_timestamp);
623
Anton Blanchard228e5482011-05-02 20:21:35 +0000624static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
625 struct msghdr *msg, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626{
627 struct sock_iocb *si = kiocb_to_siocb(iocb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628
629 si->sock = sock;
630 si->scm = NULL;
631 si->msg = msg;
632 si->size = size;
633
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 return sock->ops->sendmsg(iocb, sock, msg, size);
635}
636
Anton Blanchard228e5482011-05-02 20:21:35 +0000637static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
638 struct msghdr *msg, size_t size)
639{
640 int err = security_socket_sendmsg(sock, msg, size);
641
642 return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
643}
644
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
646{
647 struct kiocb iocb;
648 struct sock_iocb siocb;
649 int ret;
650
651 init_sync_kiocb(&iocb, NULL);
652 iocb.private = &siocb;
653 ret = __sock_sendmsg(&iocb, sock, msg, size);
654 if (-EIOCBQUEUED == ret)
655 ret = wait_on_sync_kiocb(&iocb);
656 return ret;
657}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700658EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
Eric Dumazet894dc242011-07-26 02:39:41 +0000660static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
Anton Blanchard228e5482011-05-02 20:21:35 +0000661{
662 struct kiocb iocb;
663 struct sock_iocb siocb;
664 int ret;
665
666 init_sync_kiocb(&iocb, NULL);
667 iocb.private = &siocb;
668 ret = __sock_sendmsg_nosec(&iocb, sock, msg, size);
669 if (-EIOCBQUEUED == ret)
670 ret = wait_on_sync_kiocb(&iocb);
671 return ret;
672}
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
675 struct kvec *vec, size_t num, size_t size)
676{
677 mm_segment_t oldfs = get_fs();
678 int result;
679
680 set_fs(KERNEL_DS);
681 /*
682 * the following is safe, since for compiler definitions of kvec and
683 * iovec are identical, yielding the same in-core layout and alignment
684 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700685 msg->msg_iov = (struct iovec *)vec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 msg->msg_iovlen = num;
687 result = sock_sendmsg(sock, msg, size);
688 set_fs(oldfs);
689 return result;
690}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700691EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700693/*
694 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
695 */
696void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
697 struct sk_buff *skb)
698{
Patrick Ohly20d49472009-02-12 05:03:38 +0000699 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
700 struct timespec ts[3];
701 int empty = 1;
702 struct skb_shared_hwtstamps *shhwtstamps =
703 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700704
Patrick Ohly20d49472009-02-12 05:03:38 +0000705 /* Race occurred between timestamp enabling and packet
706 receiving. Fill in the current time for now. */
707 if (need_software_tstamp && skb->tstamp.tv64 == 0)
708 __net_timestamp(skb);
709
710 if (need_software_tstamp) {
711 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
712 struct timeval tv;
713 skb_get_timestamp(skb, &tv);
714 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
715 sizeof(tv), &tv);
716 } else {
Hagen Paul Pfeifer842509b2010-04-06 05:39:52 +0000717 skb_get_timestampns(skb, &ts[0]);
Patrick Ohly20d49472009-02-12 05:03:38 +0000718 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
Hagen Paul Pfeifer842509b2010-04-06 05:39:52 +0000719 sizeof(ts[0]), &ts[0]);
Patrick Ohly20d49472009-02-12 05:03:38 +0000720 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700721 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000722
723
724 memset(ts, 0, sizeof(ts));
Daniel Borkmann6e94d1e2013-04-16 01:29:10 +0000725 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) &&
726 ktime_to_timespec_cond(skb->tstamp, ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000727 empty = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000728 if (shhwtstamps) {
729 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
Daniel Borkmann6e94d1e2013-04-16 01:29:10 +0000730 ktime_to_timespec_cond(shhwtstamps->syststamp, ts + 1))
Patrick Ohly20d49472009-02-12 05:03:38 +0000731 empty = 0;
732 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
Daniel Borkmann6e94d1e2013-04-16 01:29:10 +0000733 ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts + 2))
Patrick Ohly20d49472009-02-12 05:03:38 +0000734 empty = 0;
735 }
736 if (!empty)
737 put_cmsg(msg, SOL_SOCKET,
738 SCM_TIMESTAMPING, sizeof(ts), &ts);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700739}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300740EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
741
Johannes Berg6e3e9392011-11-09 10:15:42 +0100742void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
743 struct sk_buff *skb)
744{
745 int ack;
746
747 if (!sock_flag(sk, SOCK_WIFI_STATUS))
748 return;
749 if (!skb->wifi_acked_valid)
750 return;
751
752 ack = skb->wifi_acked;
753
754 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
755}
756EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
757
stephen hemminger11165f12010-10-18 14:27:29 +0000758static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
759 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700760{
761 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
762 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
763 sizeof(__u32), &skb->dropcount);
764}
765
Eric Dumazet767dd032010-04-28 19:14:43 +0000766void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700767 struct sk_buff *skb)
768{
769 sock_recv_timestamp(msg, sk, skb);
770 sock_recv_drops(msg, sk, skb);
771}
Eric Dumazet767dd032010-04-28 19:14:43 +0000772EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700773
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700774static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
775 struct msghdr *msg, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 struct sock_iocb *si = kiocb_to_siocb(iocb);
778
779 si->sock = sock;
780 si->scm = NULL;
781 si->msg = msg;
782 si->size = size;
783 si->flags = flags;
784
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
786}
787
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700788static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
789 struct msghdr *msg, size_t size, int flags)
790{
791 int err = security_socket_recvmsg(sock, msg, size, flags);
792
793 return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
794}
795
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700796int sock_recvmsg(struct socket *sock, struct msghdr *msg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 size_t size, int flags)
798{
799 struct kiocb iocb;
800 struct sock_iocb siocb;
801 int ret;
802
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700803 init_sync_kiocb(&iocb, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 iocb.private = &siocb;
805 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
806 if (-EIOCBQUEUED == ret)
807 ret = wait_on_sync_kiocb(&iocb);
808 return ret;
809}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700810EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700812static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
813 size_t size, int flags)
814{
815 struct kiocb iocb;
816 struct sock_iocb siocb;
817 int ret;
818
819 init_sync_kiocb(&iocb, NULL);
820 iocb.private = &siocb;
821 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
822 if (-EIOCBQUEUED == ret)
823 ret = wait_on_sync_kiocb(&iocb);
824 return ret;
825}
826
Martin Lucinac1249c02010-12-10 00:04:05 +0000827/**
828 * kernel_recvmsg - Receive a message from a socket (kernel space)
829 * @sock: The socket to receive the message from
830 * @msg: Received message
831 * @vec: Input s/g array for message data
832 * @num: Size of input s/g array
833 * @size: Number of bytes to read
834 * @flags: Message flags (MSG_DONTWAIT, etc...)
835 *
836 * On return the msg structure contains the scatter/gather array passed in the
837 * vec argument. The array is modified so that it consists of the unfilled
838 * portion of the original array.
839 *
840 * The returned value is the total number of bytes received, or an error.
841 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700842int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
843 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844{
845 mm_segment_t oldfs = get_fs();
846 int result;
847
848 set_fs(KERNEL_DS);
849 /*
850 * the following is safe, since for compiler definitions of kvec and
851 * iovec are identical, yielding the same in-core layout and alignment
852 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700853 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 result = sock_recvmsg(sock, msg, size, flags);
855 set_fs(oldfs);
856 return result;
857}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700858EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300860static ssize_t sock_sendpage(struct file *file, struct page *page,
861 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862{
863 struct socket *sock;
864 int flags;
865
Eric Dumazetb69aee02005-09-06 14:42:45 -0700866 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
Eric Dumazet35f9c092012-04-05 03:05:35 +0000868 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
869 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
870 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Linus Torvaldse6949582009-08-13 08:28:36 -0700872 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873}
874
Jens Axboe9c55e012007-11-06 23:30:13 -0800875static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700876 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800877 unsigned int flags)
878{
879 struct socket *sock = file->private_data;
880
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800881 if (unlikely(!sock->ops->splice_read))
882 return -EINVAL;
883
Jens Axboe9c55e012007-11-06 23:30:13 -0800884 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
885}
886
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800887static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700888 struct sock_iocb *siocb)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800889{
Kent Overstreetd29c4452013-03-18 11:09:26 -0700890 if (!is_sync_kiocb(iocb))
891 BUG();
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800892
893 siocb->kiocb = iocb;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800894 iocb->private = siocb;
895 return siocb;
896}
897
898static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700899 struct file *file, const struct iovec *iov,
900 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800901{
902 struct socket *sock = file->private_data;
903 size_t size = 0;
904 int i;
905
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700906 for (i = 0; i < nr_segs; i++)
907 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800908
909 msg->msg_name = NULL;
910 msg->msg_namelen = 0;
911 msg->msg_control = NULL;
912 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700913 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800914 msg->msg_iovlen = nr_segs;
915 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
916
917 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
918}
919
Badari Pulavarty027445c2006-09-30 23:28:46 -0700920static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
921 unsigned long nr_segs, loff_t pos)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800922{
923 struct sock_iocb siocb, *x;
924
925 if (pos != 0)
926 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700927
Kent Overstreet73a70752013-05-09 15:03:42 -0700928 if (iocb->ki_nbytes == 0) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800929 return 0;
930
Badari Pulavarty027445c2006-09-30 23:28:46 -0700931
932 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800933 if (!x)
934 return -ENOMEM;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700935 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800936}
937
938static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700939 struct file *file, const struct iovec *iov,
940 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800941{
942 struct socket *sock = file->private_data;
943 size_t size = 0;
944 int i;
945
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700946 for (i = 0; i < nr_segs; i++)
947 size += iov[i].iov_len;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800948
949 msg->msg_name = NULL;
950 msg->msg_namelen = 0;
951 msg->msg_control = NULL;
952 msg->msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700953 msg->msg_iov = (struct iovec *)iov;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800954 msg->msg_iovlen = nr_segs;
955 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
956 if (sock->type == SOCK_SEQPACKET)
957 msg->msg_flags |= MSG_EOR;
958
959 return __sock_sendmsg(iocb, sock, msg, size);
960}
961
Badari Pulavarty027445c2006-09-30 23:28:46 -0700962static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
963 unsigned long nr_segs, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964{
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800965 struct sock_iocb siocb, *x;
966
967 if (pos != 0)
968 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700969
Badari Pulavarty027445c2006-09-30 23:28:46 -0700970 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800971 if (!x)
972 return -ENOMEM;
973
Badari Pulavarty027445c2006-09-30 23:28:46 -0700974 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975}
976
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977/*
978 * Atomic setting of ioctl hooks to avoid race
979 * with module unload.
980 */
981
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800982static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700983static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
Eric W. Biederman881d9662007-09-17 11:56:21 -0700985void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800987 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800989 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990}
991EXPORT_SYMBOL(brioctl_set);
992
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800993static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700994static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995
Eric W. Biederman881d9662007-09-17 11:56:21 -0700996void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800998 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001000 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001}
1002EXPORT_SYMBOL(vlan_ioctl_set);
1003
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001004static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001005static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001007void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001009 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001011 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012}
1013EXPORT_SYMBOL(dlci_ioctl_set);
1014
Arnd Bergmann6b960182009-11-06 23:10:54 -08001015static long sock_do_ioctl(struct net *net, struct socket *sock,
1016 unsigned int cmd, unsigned long arg)
1017{
1018 int err;
1019 void __user *argp = (void __user *)arg;
1020
1021 err = sock->ops->ioctl(sock, cmd, arg);
1022
1023 /*
1024 * If this ioctl is unknown try to hand it down
1025 * to the NIC driver.
1026 */
1027 if (err == -ENOIOCTLCMD)
1028 err = dev_ioctl(net, cmd, argp);
1029
1030 return err;
1031}
1032
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033/*
1034 * With an ioctl, arg may well be a user mode pointer, but we don't know
1035 * what to do with it - that's up to the protocol still.
1036 */
1037
1038static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1039{
1040 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001041 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 void __user *argp = (void __user *)arg;
1043 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001044 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
Eric Dumazetb69aee02005-09-06 14:42:45 -07001046 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001047 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001048 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
Eric W. Biederman881d9662007-09-17 11:56:21 -07001050 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001052#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Eric W. Biederman881d9662007-09-17 11:56:21 -07001054 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001056#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001057 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 case FIOSETOWN:
1059 case SIOCSPGRP:
1060 err = -EFAULT;
1061 if (get_user(pid, (int __user *)argp))
1062 break;
1063 err = f_setown(sock->file, pid, 1);
1064 break;
1065 case FIOGETOWN:
1066 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001067 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001068 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 break;
1070 case SIOCGIFBR:
1071 case SIOCSIFBR:
1072 case SIOCBRADDBR:
1073 case SIOCBRDELBR:
1074 err = -ENOPKG;
1075 if (!br_ioctl_hook)
1076 request_module("bridge");
1077
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001078 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001079 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001080 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001081 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 break;
1083 case SIOCGIFVLAN:
1084 case SIOCSIFVLAN:
1085 err = -ENOPKG;
1086 if (!vlan_ioctl_hook)
1087 request_module("8021q");
1088
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001089 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001091 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001092 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 case SIOCADDDLCI:
1095 case SIOCDELDLCI:
1096 err = -ENOPKG;
1097 if (!dlci_ioctl_hook)
1098 request_module("dlci");
1099
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001100 mutex_lock(&dlci_ioctl_mutex);
1101 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001103 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 break;
1105 default:
Arnd Bergmann6b960182009-11-06 23:10:54 -08001106 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001108 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 return err;
1110}
1111
1112int sock_create_lite(int family, int type, int protocol, struct socket **res)
1113{
1114 int err;
1115 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001116
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 err = security_socket_create(family, type, protocol, 1);
1118 if (err)
1119 goto out;
1120
1121 sock = sock_alloc();
1122 if (!sock) {
1123 err = -ENOMEM;
1124 goto out;
1125 }
1126
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001128 err = security_socket_post_create(sock, family, type, protocol, 1);
1129 if (err)
1130 goto out_release;
1131
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132out:
1133 *res = sock;
1134 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001135out_release:
1136 sock_release(sock);
1137 sock = NULL;
1138 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001140EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141
1142/* No kernel lock held - perfect */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001143static unsigned int sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144{
Eliezer Tamircbf55002013-07-08 16:20:34 +03001145 unsigned int busy_flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 struct socket *sock;
1147
1148 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001149 * We can't return errors to poll, so it's either yes or no.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 */
Eric Dumazetb69aee02005-09-06 14:42:45 -07001151 sock = file->private_data;
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001152
Eliezer Tamircbf55002013-07-08 16:20:34 +03001153 if (sk_can_busy_loop(sock->sk)) {
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001154 /* this socket can poll_ll so tell the system call */
Eliezer Tamircbf55002013-07-08 16:20:34 +03001155 busy_flag = POLL_BUSY_LOOP;
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001156
1157 /* once, only if requested by syscall */
Eliezer Tamircbf55002013-07-08 16:20:34 +03001158 if (wait && (wait->_key & POLL_BUSY_LOOP))
1159 sk_busy_loop(sock->sk, 1);
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001160 }
1161
Eliezer Tamircbf55002013-07-08 16:20:34 +03001162 return busy_flag | sock->ops->poll(file, sock, wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163}
1164
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001165static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001167 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168
1169 return sock->ops->mmap(file, sock, vma);
1170}
1171
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001172static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 sock_release(SOCKET_I(inode));
1175 return 0;
1176}
1177
1178/*
1179 * Update the socket async list
1180 *
1181 * Fasync_list locking strategy.
1182 *
1183 * 1. fasync_list is modified only under process context socket lock
1184 * i.e. under semaphore.
1185 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001186 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 */
1188
1189static int sock_fasync(int fd, struct file *filp, int on)
1190{
Eric Dumazet989a2972010-04-14 09:55:35 +00001191 struct socket *sock = filp->private_data;
1192 struct sock *sk = sock->sk;
Eric Dumazeteaefd112011-02-18 03:26:36 +00001193 struct socket_wq *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
Eric Dumazet989a2972010-04-14 09:55:35 +00001195 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197
1198 lock_sock(sk);
Eric Dumazeteaefd112011-02-18 03:26:36 +00001199 wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
1200 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201
Eric Dumazeteaefd112011-02-18 03:26:36 +00001202 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001203 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001204 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001205 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206
Eric Dumazet989a2972010-04-14 09:55:35 +00001207 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 return 0;
1209}
1210
Eric Dumazet43815482010-04-29 11:01:49 +00001211/* This function may be called only under socket lock or callback_lock or rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212
1213int sock_wake_async(struct socket *sock, int how, int band)
1214{
Eric Dumazet43815482010-04-29 11:01:49 +00001215 struct socket_wq *wq;
1216
1217 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001219 rcu_read_lock();
1220 wq = rcu_dereference(sock->wq);
1221 if (!wq || !wq->fasync_list) {
1222 rcu_read_unlock();
1223 return -1;
1224 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001225 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001226 case SOCK_WAKE_WAITD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1228 break;
1229 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001230 case SOCK_WAKE_SPACE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1232 break;
1233 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001234 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001235call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001236 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001238 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001239 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 }
Eric Dumazet43815482010-04-29 11:01:49 +00001241 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 return 0;
1243}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001244EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245
Pavel Emelyanov721db932010-09-29 16:06:32 +04001246int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001247 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248{
1249 int err;
1250 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001251 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252
1253 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001254 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 */
1256 if (family < 0 || family >= NPROTO)
1257 return -EAFNOSUPPORT;
1258 if (type < 0 || type >= SOCK_MAX)
1259 return -EINVAL;
1260
1261 /* Compatibility.
1262
1263 This uglymoron is moved from INET layer to here to avoid
1264 deadlock in module load.
1265 */
1266 if (family == PF_INET && type == SOCK_PACKET) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001267 static int warned;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 if (!warned) {
1269 warned = 1;
Yang Yingliang3410f222014-02-12 17:09:55 +08001270 pr_info("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1271 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 }
1273 family = PF_PACKET;
1274 }
1275
1276 err = security_socket_create(family, type, protocol, kern);
1277 if (err)
1278 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001279
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001280 /*
1281 * Allocate the socket and allow the family to set things up. if
1282 * the protocol is 0, the family is instructed to select an appropriate
1283 * default.
1284 */
1285 sock = sock_alloc();
1286 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001287 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001288 return -ENFILE; /* Not exactly a match, but its the
1289 closest posix thing */
1290 }
1291
1292 sock->type = type;
1293
Johannes Berg95a5afc2008-10-16 15:24:51 -07001294#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001295 /* Attempt to load a protocol module if the find failed.
1296 *
1297 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 * requested real, full-featured networking support upon configuration.
1299 * Otherwise module support will break!
1300 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001301 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001302 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303#endif
1304
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001305 rcu_read_lock();
1306 pf = rcu_dereference(net_families[family]);
1307 err = -EAFNOSUPPORT;
1308 if (!pf)
1309 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310
1311 /*
1312 * We will call the ->create function, that possibly is in a loadable
1313 * module, so we have to bump that loadable module refcnt first.
1314 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001315 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 goto out_release;
1317
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001318 /* Now protected by module ref count */
1319 rcu_read_unlock();
1320
Eric Paris3f378b62009-11-05 22:18:14 -08001321 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001322 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001324
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 /*
1326 * Now to bump the refcnt of the [loadable] module that owns this
1327 * socket at sock_release time we decrement its refcnt.
1328 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001329 if (!try_module_get(sock->ops->owner))
1330 goto out_module_busy;
1331
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 /*
1333 * Now that we're done with the ->create function, the [loadable]
1334 * module can have its refcnt decremented
1335 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001336 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001337 err = security_socket_post_create(sock, family, type, protocol, kern);
1338 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001339 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001340 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001342 return 0;
1343
1344out_module_busy:
1345 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001347 sock->ops = NULL;
1348 module_put(pf->owner);
1349out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001351 return err;
1352
1353out_release:
1354 rcu_read_unlock();
1355 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001357EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358
1359int sock_create(int family, int type, int protocol, struct socket **res)
1360{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001361 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001363EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364
1365int sock_create_kern(int family, int type, int protocol, struct socket **res)
1366{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001367 return __sock_create(&init_net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001369EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001371SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372{
1373 int retval;
1374 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001375 int flags;
1376
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001377 /* Check the SOCK_* constants for consistency. */
1378 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1379 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1380 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1381 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1382
Ulrich Dreppera677a032008-07-23 21:29:17 -07001383 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001384 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001385 return -EINVAL;
1386 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001388 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1389 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1390
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 retval = sock_create(family, type, protocol, &sock);
1392 if (retval < 0)
1393 goto out;
1394
Ulrich Drepper77d27202008-07-23 21:29:35 -07001395 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 if (retval < 0)
1397 goto out_release;
1398
1399out:
1400 /* It may be already another descriptor 8) Not kernel problem. */
1401 return retval;
1402
1403out_release:
1404 sock_release(sock);
1405 return retval;
1406}
1407
1408/*
1409 * Create a pair of connected sockets.
1410 */
1411
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001412SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1413 int __user *, usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414{
1415 struct socket *sock1, *sock2;
1416 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001417 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001418 int flags;
1419
1420 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001421 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001422 return -EINVAL;
1423 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001425 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1426 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1427
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 /*
1429 * Obtain the first socket and check if the underlying protocol
1430 * supports the socketpair call.
1431 */
1432
1433 err = sock_create(family, type, protocol, &sock1);
1434 if (err < 0)
1435 goto out;
1436
1437 err = sock_create(family, type, protocol, &sock2);
1438 if (err < 0)
1439 goto out_release_1;
1440
1441 err = sock1->ops->socketpair(sock1, sock2);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001442 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443 goto out_release_both;
1444
Al Viro28407632012-08-17 23:54:15 -04001445 fd1 = get_unused_fd_flags(flags);
David S. Millerbf3c23d2007-10-29 21:54:02 -07001446 if (unlikely(fd1 < 0)) {
1447 err = fd1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 goto out_release_both;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001449 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001450
Al Viro28407632012-08-17 23:54:15 -04001451 fd2 = get_unused_fd_flags(flags);
Al Viro198de4d2009-08-05 19:29:23 +04001452 if (unlikely(fd2 < 0)) {
1453 err = fd2;
Yann Droneaudd73aa282013-12-09 22:42:20 +01001454 goto out_put_unused_1;
Al Viro28407632012-08-17 23:54:15 -04001455 }
1456
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001457 newfile1 = sock_alloc_file(sock1, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001458 if (unlikely(IS_ERR(newfile1))) {
1459 err = PTR_ERR(newfile1);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001460 goto out_put_unused_both;
Al Viro28407632012-08-17 23:54:15 -04001461 }
1462
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001463 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001464 if (IS_ERR(newfile2)) {
1465 err = PTR_ERR(newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001466 goto out_fput_1;
Al Virodb349502007-02-07 01:48:00 -05001467 }
1468
Yann Droneaudd73aa282013-12-09 22:42:20 +01001469 err = put_user(fd1, &usockvec[0]);
1470 if (err)
1471 goto out_fput_both;
1472
1473 err = put_user(fd2, &usockvec[1]);
1474 if (err)
1475 goto out_fput_both;
1476
Al Viro157cf642008-12-14 04:57:47 -05001477 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001478
Al Virodb349502007-02-07 01:48:00 -05001479 fd_install(fd1, newfile1);
1480 fd_install(fd2, newfile2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 /* fd1 and fd2 may be already another descriptors.
1482 * Not kernel problem.
1483 */
1484
Yann Droneaudd73aa282013-12-09 22:42:20 +01001485 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486
Yann Droneaudd73aa282013-12-09 22:42:20 +01001487out_fput_both:
1488 fput(newfile2);
1489 fput(newfile1);
1490 put_unused_fd(fd2);
1491 put_unused_fd(fd1);
1492 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493
Yann Droneaudd73aa282013-12-09 22:42:20 +01001494out_fput_1:
1495 fput(newfile1);
1496 put_unused_fd(fd2);
1497 put_unused_fd(fd1);
1498 sock_release(sock2);
1499 goto out;
1500
1501out_put_unused_both:
1502 put_unused_fd(fd2);
1503out_put_unused_1:
1504 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505out_release_both:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001506 sock_release(sock2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507out_release_1:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001508 sock_release(sock1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509out:
1510 return err;
1511}
1512
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513/*
1514 * Bind a name to a socket. Nothing much to do here since it's
1515 * the protocol's responsibility to handle the local address.
1516 *
1517 * We move the socket address to kernel space before we call
1518 * the protocol layer (having also checked the address is ok).
1519 */
1520
Heiko Carstens20f37032009-01-14 14:14:23 +01001521SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522{
1523 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001524 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001525 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001527 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001528 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001529 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001530 if (err >= 0) {
1531 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001532 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001533 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001534 if (!err)
1535 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001536 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001537 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001539 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001540 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 return err;
1542}
1543
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544/*
1545 * Perform a listen. Basically, we allow the protocol to do anything
1546 * necessary for a listen, and if that works, we mark the socket as
1547 * ready for listening.
1548 */
1549
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001550SYSCALL_DEFINE2(listen, int, fd, int, backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551{
1552 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001553 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001554 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001555
1556 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1557 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001558 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001559 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001560 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561
1562 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001563 if (!err)
1564 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001566 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 }
1568 return err;
1569}
1570
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571/*
1572 * For accept, we attempt to create a new socket, set up the link
1573 * with the client, wake up the client, then return the new
1574 * connected fd. We collect the address of the connector in kernel
1575 * space and move it to user at the very end. This is unclean because
1576 * we open the socket then return an error.
1577 *
1578 * 1003.1g adds the ability to recvmsg() to query connection pending
1579 * status to recvmsg. We need to add that support in a way thats
1580 * clean when we restucture accept also.
1581 */
1582
Heiko Carstens20f37032009-01-14 14:14:23 +01001583SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1584 int __user *, upeer_addrlen, int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585{
1586 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001587 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001588 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001589 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590
Ulrich Drepper77d27202008-07-23 21:29:35 -07001591 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001592 return -EINVAL;
1593
1594 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1595 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1596
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001597 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 if (!sock)
1599 goto out;
1600
1601 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001602 newsock = sock_alloc();
1603 if (!newsock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604 goto out_put;
1605
1606 newsock->type = sock->type;
1607 newsock->ops = sock->ops;
1608
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609 /*
1610 * We don't need try_module_get here, as the listening socket (sock)
1611 * has the protocol module (sock->ops->owner) held.
1612 */
1613 __module_get(newsock->ops->owner);
1614
Al Viro28407632012-08-17 23:54:15 -04001615 newfd = get_unused_fd_flags(flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001616 if (unlikely(newfd < 0)) {
1617 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001618 sock_release(newsock);
1619 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001620 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001621 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Al Viro28407632012-08-17 23:54:15 -04001622 if (unlikely(IS_ERR(newfile))) {
1623 err = PTR_ERR(newfile);
1624 put_unused_fd(newfd);
1625 sock_release(newsock);
1626 goto out_put;
1627 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001628
Frank Filza79af592005-09-27 15:23:38 -07001629 err = security_socket_accept(sock, newsock);
1630 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001631 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001632
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1634 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001635 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636
1637 if (upeer_sockaddr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001638 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001639 &len, 2) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001641 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001643 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001644 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001646 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 }
1648
1649 /* File flags are not inherited via accept() unlike another OSes. */
1650
David S. Miller39d8c1b2006-03-20 17:13:49 -08001651 fd_install(newfd, newfile);
1652 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001655 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656out:
1657 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001658out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001659 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001660 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661 goto out_put;
1662}
1663
Heiko Carstens20f37032009-01-14 14:14:23 +01001664SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1665 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001666{
Ulrich Drepperde11def2008-11-19 15:36:14 -08001667 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001668}
1669
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670/*
1671 * Attempt to connect to a socket with the server address. The address
1672 * is in user space so we verify it is OK and move it to kernel space.
1673 *
1674 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1675 * break bindings
1676 *
1677 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1678 * other SEQPACKET protocols that take time to connect() as it doesn't
1679 * include the -EINPROGRESS status for such sockets.
1680 */
1681
Heiko Carstens20f37032009-01-14 14:14:23 +01001682SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1683 int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684{
1685 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001686 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001687 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001689 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 if (!sock)
1691 goto out;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001692 err = move_addr_to_kernel(uservaddr, addrlen, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 if (err < 0)
1694 goto out_put;
1695
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001696 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001697 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698 if (err)
1699 goto out_put;
1700
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001701 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702 sock->file->f_flags);
1703out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001704 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705out:
1706 return err;
1707}
1708
1709/*
1710 * Get the local address ('name') of a socket object. Move the obtained
1711 * name to user space.
1712 */
1713
Heiko Carstens20f37032009-01-14 14:14:23 +01001714SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1715 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716{
1717 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001718 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001719 int len, err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001720
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001721 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722 if (!sock)
1723 goto out;
1724
1725 err = security_socket_getsockname(sock);
1726 if (err)
1727 goto out_put;
1728
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001729 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 if (err)
1731 goto out_put;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001732 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733
1734out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001735 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736out:
1737 return err;
1738}
1739
1740/*
1741 * Get the remote address ('name') of a socket object. Move the obtained
1742 * name to user space.
1743 */
1744
Heiko Carstens20f37032009-01-14 14:14:23 +01001745SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1746 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747{
1748 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001749 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001750 int len, err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001752 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1753 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 err = security_socket_getpeername(sock);
1755 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001756 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757 return err;
1758 }
1759
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001760 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001761 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001762 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763 if (!err)
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001764 err = move_addr_to_user(&address, len, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001765 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001766 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767 }
1768 return err;
1769}
1770
1771/*
1772 * Send a datagram to a given address. We move the address into kernel
1773 * space and check the user space data area is readable before invoking
1774 * the protocol.
1775 */
1776
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001777SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001778 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001779 int, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780{
1781 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001782 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 int err;
1784 struct msghdr msg;
1785 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001786 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001787
Linus Torvalds253eacc2010-10-30 16:43:10 -07001788 if (len > INT_MAX)
1789 len = INT_MAX;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001790 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1791 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001792 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001793
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001794 iov.iov_base = buff;
1795 iov.iov_len = len;
1796 msg.msg_name = NULL;
1797 msg.msg_iov = &iov;
1798 msg.msg_iovlen = 1;
1799 msg.msg_control = NULL;
1800 msg.msg_controllen = 0;
1801 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001802 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001803 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 if (err < 0)
1805 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001806 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001807 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808 }
1809 if (sock->file->f_flags & O_NONBLOCK)
1810 flags |= MSG_DONTWAIT;
1811 msg.msg_flags = flags;
1812 err = sock_sendmsg(sock, &msg, len);
1813
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001814out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001815 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001816out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 return err;
1818}
1819
1820/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001821 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 */
1823
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001824SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001825 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826{
1827 return sys_sendto(fd, buff, len, flags, NULL, 0);
1828}
1829
1830/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001831 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832 * sender. We verify the buffers are writable and if needed move the
1833 * sender address from kernel to user space.
1834 */
1835
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001836SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
Eric Dumazet95c96172012-04-15 05:58:06 +00001837 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001838 int __user *, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839{
1840 struct socket *sock;
1841 struct iovec iov;
1842 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001843 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001844 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001845 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846
Linus Torvalds253eacc2010-10-30 16:43:10 -07001847 if (size > INT_MAX)
1848 size = INT_MAX;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001849 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001851 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001853 msg.msg_control = NULL;
1854 msg.msg_controllen = 0;
1855 msg.msg_iovlen = 1;
1856 msg.msg_iov = &iov;
1857 iov.iov_len = size;
1858 iov.iov_base = ubuf;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01001859 /* Save some cycles and don't copy the address if not needed */
1860 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1861 /* We assume all kernel code knows the size of sockaddr_storage */
1862 msg.msg_namelen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863 if (sock->file->f_flags & O_NONBLOCK)
1864 flags |= MSG_DONTWAIT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001865 err = sock_recvmsg(sock, &msg, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001867 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001868 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001869 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001870 if (err2 < 0)
1871 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001873
1874 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001875out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876 return err;
1877}
1878
1879/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001880 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881 */
1882
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001883asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
Eric Dumazet95c96172012-04-15 05:58:06 +00001884 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885{
1886 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1887}
1888
1889/*
1890 * Set a socket option. Because we don't know the option lengths we have
1891 * to pass the user mode parameter for the protocols to sort out.
1892 */
1893
Heiko Carstens20f37032009-01-14 14:14:23 +01001894SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1895 char __user *, optval, int, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001897 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898 struct socket *sock;
1899
1900 if (optlen < 0)
1901 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001902
1903 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1904 if (sock != NULL) {
1905 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001906 if (err)
1907 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908
1909 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001910 err =
1911 sock_setsockopt(sock, level, optname, optval,
1912 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001914 err =
1915 sock->ops->setsockopt(sock, level, optname, optval,
1916 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001917out_put:
1918 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 }
1920 return err;
1921}
1922
1923/*
1924 * Get a socket option. Because we don't know the option lengths we have
1925 * to pass a user mode parameter for the protocols to sort out.
1926 */
1927
Heiko Carstens20f37032009-01-14 14:14:23 +01001928SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1929 char __user *, optval, int __user *, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001931 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 struct socket *sock;
1933
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001934 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1935 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001936 err = security_socket_getsockopt(sock, level, optname);
1937 if (err)
1938 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939
1940 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001941 err =
1942 sock_getsockopt(sock, level, optname, optval,
1943 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001945 err =
1946 sock->ops->getsockopt(sock, level, optname, optval,
1947 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001948out_put:
1949 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950 }
1951 return err;
1952}
1953
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954/*
1955 * Shutdown a socket.
1956 */
1957
Heiko Carstens754fe8d2009-01-14 14:14:09 +01001958SYSCALL_DEFINE2(shutdown, int, fd, int, how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001960 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 struct socket *sock;
1962
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001963 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1964 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001966 if (!err)
1967 err = sock->ops->shutdown(sock, how);
1968 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969 }
1970 return err;
1971}
1972
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001973/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974 * fields which are the same type (int / unsigned) on our platforms.
1975 */
1976#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1977#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1978#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1979
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001980struct used_address {
1981 struct sockaddr_storage name;
1982 unsigned int name_len;
1983};
1984
Dan Carpenter1661bf32013-10-03 00:27:20 +03001985static int copy_msghdr_from_user(struct msghdr *kmsg,
1986 struct msghdr __user *umsg)
1987{
1988 if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
1989 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00001990
1991 if (kmsg->msg_namelen < 0)
1992 return -EINVAL;
1993
Dan Carpenter1661bf32013-10-03 00:27:20 +03001994 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03001995 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Dan Carpenter1661bf32013-10-03 00:27:20 +03001996 return 0;
1997}
1998
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00001999static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002000 struct msghdr *msg_sys, unsigned int flags,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002001 struct used_address *used_address)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002002{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002003 struct compat_msghdr __user *msg_compat =
2004 (struct compat_msghdr __user *)msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002005 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07002007 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002008 __attribute__ ((aligned(sizeof(__kernel_size_t))));
2009 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010 unsigned char *ctl_buf = ctl;
Eric Dumazeta74e9102012-04-20 20:04:01 +02002011 int err, ctl_len, total_len;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002012
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013 err = -EFAULT;
2014 if (MSG_CMSG_COMPAT & flags) {
Anton Blanchard228e5482011-05-02 20:21:35 +00002015 if (get_compat_msghdr(msg_sys, msg_compat))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016 return -EFAULT;
Dan Carpenter1661bf32013-10-03 00:27:20 +03002017 } else {
2018 err = copy_msghdr_from_user(msg_sys, msg);
2019 if (err)
2020 return err;
2021 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022
Anton Blanchard228e5482011-05-02 20:21:35 +00002023 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
Eric Dumazeta74e9102012-04-20 20:04:01 +02002024 err = -EMSGSIZE;
2025 if (msg_sys->msg_iovlen > UIO_MAXIOV)
2026 goto out;
2027 err = -ENOMEM;
2028 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
2029 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030 if (!iov)
Anton Blanchard228e5482011-05-02 20:21:35 +00002031 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032 }
2033
2034 /* This will also move the address data into kernel space */
2035 if (MSG_CMSG_COMPAT & flags) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002036 err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037 } else
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002038 err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002039 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040 goto out_freeiov;
2041 total_len = err;
2042
2043 err = -ENOBUFS;
2044
Anton Blanchard228e5482011-05-02 20:21:35 +00002045 if (msg_sys->msg_controllen > INT_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002046 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00002047 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002049 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00002050 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002051 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052 if (err)
2053 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00002054 ctl_buf = msg_sys->msg_control;
2055 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056 } else if (ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002057 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002058 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002059 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060 goto out_freeiov;
2061 }
2062 err = -EFAULT;
2063 /*
Anton Blanchard228e5482011-05-02 20:21:35 +00002064 * Careful! Before this, msg_sys->msg_control contains a user pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002065 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2066 * checking falls down on this.
2067 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00002068 if (copy_from_user(ctl_buf,
Anton Blanchard228e5482011-05-02 20:21:35 +00002069 (void __user __force *)msg_sys->msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002070 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00002072 msg_sys->msg_control = ctl_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073 }
Anton Blanchard228e5482011-05-02 20:21:35 +00002074 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075
2076 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00002077 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002078 /*
2079 * If this is sendmmsg() and current destination address is same as
2080 * previously succeeded address, omit asking LSM's decision.
2081 * used_address->name_len is initialized to UINT_MAX so that the first
2082 * destination address never matches.
2083 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002084 if (used_address && msg_sys->msg_name &&
2085 used_address->name_len == msg_sys->msg_namelen &&
2086 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002087 used_address->name_len)) {
2088 err = sock_sendmsg_nosec(sock, msg_sys, total_len);
2089 goto out_freectl;
2090 }
2091 err = sock_sendmsg(sock, msg_sys, total_len);
2092 /*
2093 * If this is sendmmsg() and sending to current destination address was
2094 * successful, remember it.
2095 */
2096 if (used_address && err >= 0) {
2097 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002098 if (msg_sys->msg_name)
2099 memcpy(&used_address->name, msg_sys->msg_name,
2100 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002101 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102
2103out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002104 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2106out_freeiov:
2107 if (iov != iovstack)
Eric Dumazeta74e9102012-04-20 20:04:01 +02002108 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00002109out:
2110 return err;
2111}
2112
2113/*
2114 * BSD sendmsg interface
2115 */
2116
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002117long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
Anton Blanchard228e5482011-05-02 20:21:35 +00002118{
2119 int fput_needed, err;
2120 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002121 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00002122
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002123 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00002124 if (!sock)
2125 goto out;
2126
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002127 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
Anton Blanchard228e5482011-05-02 20:21:35 +00002128
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002129 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002130out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131 return err;
2132}
2133
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002134SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
2135{
2136 if (flags & MSG_CMSG_COMPAT)
2137 return -EINVAL;
2138 return __sys_sendmsg(fd, msg, flags);
2139}
2140
Anton Blanchard228e5482011-05-02 20:21:35 +00002141/*
2142 * Linux sendmmsg interface
2143 */
2144
2145int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2146 unsigned int flags)
2147{
2148 int fput_needed, err, datagrams;
2149 struct socket *sock;
2150 struct mmsghdr __user *entry;
2151 struct compat_mmsghdr __user *compat_entry;
2152 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002153 struct used_address used_address;
Anton Blanchard228e5482011-05-02 20:21:35 +00002154
Anton Blanchard98382f42011-08-04 14:07:39 +00002155 if (vlen > UIO_MAXIOV)
2156 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002157
2158 datagrams = 0;
2159
2160 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2161 if (!sock)
2162 return err;
2163
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002164 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002165 entry = mmsg;
2166 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002167 err = 0;
Anton Blanchard228e5482011-05-02 20:21:35 +00002168
2169 while (datagrams < vlen) {
Anton Blanchard228e5482011-05-02 20:21:35 +00002170 if (MSG_CMSG_COMPAT & flags) {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002171 err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
2172 &msg_sys, flags, &used_address);
Anton Blanchard228e5482011-05-02 20:21:35 +00002173 if (err < 0)
2174 break;
2175 err = __put_user(err, &compat_entry->msg_len);
2176 ++compat_entry;
2177 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002178 err = ___sys_sendmsg(sock,
2179 (struct msghdr __user *)entry,
2180 &msg_sys, flags, &used_address);
Anton Blanchard228e5482011-05-02 20:21:35 +00002181 if (err < 0)
2182 break;
2183 err = put_user(err, &entry->msg_len);
2184 ++entry;
2185 }
2186
2187 if (err)
2188 break;
2189 ++datagrams;
2190 }
2191
Anton Blanchard228e5482011-05-02 20:21:35 +00002192 fput_light(sock->file, fput_needed);
2193
Anton Blanchard728ffb82011-08-04 14:07:38 +00002194 /* We only return an error if no datagrams were able to be sent */
2195 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002196 return datagrams;
2197
Anton Blanchard228e5482011-05-02 20:21:35 +00002198 return err;
2199}
2200
2201SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2202 unsigned int, vlen, unsigned int, flags)
2203{
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002204 if (flags & MSG_CMSG_COMPAT)
2205 return -EINVAL;
Anton Blanchard228e5482011-05-02 20:21:35 +00002206 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2207}
2208
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002209static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002210 struct msghdr *msg_sys, unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002211{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002212 struct compat_msghdr __user *msg_compat =
2213 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002215 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002216 unsigned long cmsg_ptr;
Eric Dumazeta74e9102012-04-20 20:04:01 +02002217 int err, total_len, len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002218
2219 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002220 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221
2222 /* user mode address pointers */
2223 struct sockaddr __user *uaddr;
2224 int __user *uaddr_len;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002225
Linus Torvalds1da177e2005-04-16 15:20:36 -07002226 if (MSG_CMSG_COMPAT & flags) {
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002227 if (get_compat_msghdr(msg_sys, msg_compat))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228 return -EFAULT;
Dan Carpenter1661bf32013-10-03 00:27:20 +03002229 } else {
2230 err = copy_msghdr_from_user(msg_sys, msg);
2231 if (err)
2232 return err;
2233 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002235 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
Eric Dumazeta74e9102012-04-20 20:04:01 +02002236 err = -EMSGSIZE;
2237 if (msg_sys->msg_iovlen > UIO_MAXIOV)
2238 goto out;
2239 err = -ENOMEM;
2240 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
2241 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242 if (!iov)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002243 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002244 }
2245
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002246 /* Save the user-mode address (verify_iovec will change the
2247 * kernel msghdr to use the kernel address space)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248 */
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002249 uaddr = (__force void __user *)msg_sys->msg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250 uaddr_len = COMPAT_NAMELEN(msg);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002251 if (MSG_CMSG_COMPAT & flags)
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002252 err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002253 else
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002254 err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002255 if (err < 0)
2256 goto out_freeiov;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002257 total_len = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002258
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002259 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2260 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002261
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002262 /* We assume all kernel code knows the size of sockaddr_storage */
2263 msg_sys->msg_namelen = 0;
2264
Linus Torvalds1da177e2005-04-16 15:20:36 -07002265 if (sock->file->f_flags & O_NONBLOCK)
2266 flags |= MSG_DONTWAIT;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002267 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
2268 total_len, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269 if (err < 0)
2270 goto out_freeiov;
2271 len = err;
2272
2273 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002274 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002275 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002276 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002277 if (err < 0)
2278 goto out_freeiov;
2279 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002280 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002281 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282 if (err)
2283 goto out_freeiov;
2284 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002285 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002286 &msg_compat->msg_controllen);
2287 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002288 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002289 &msg->msg_controllen);
2290 if (err)
2291 goto out_freeiov;
2292 err = len;
2293
2294out_freeiov:
2295 if (iov != iovstack)
Eric Dumazeta74e9102012-04-20 20:04:01 +02002296 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002297out:
2298 return err;
2299}
2300
2301/*
2302 * BSD recvmsg interface
2303 */
2304
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002305long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002306{
2307 int fput_needed, err;
2308 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002309 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002310
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002311 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002312 if (!sock)
2313 goto out;
2314
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002315 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002316
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002317 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318out:
2319 return err;
2320}
2321
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002322SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
2323 unsigned int, flags)
2324{
2325 if (flags & MSG_CMSG_COMPAT)
2326 return -EINVAL;
2327 return __sys_recvmsg(fd, msg, flags);
2328}
2329
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002330/*
2331 * Linux recvmmsg interface
2332 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002333
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002334int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2335 unsigned int flags, struct timespec *timeout)
2336{
2337 int fput_needed, err, datagrams;
2338 struct socket *sock;
2339 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002340 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002341 struct msghdr msg_sys;
2342 struct timespec end_time;
2343
2344 if (timeout &&
2345 poll_select_set_timeout(&end_time, timeout->tv_sec,
2346 timeout->tv_nsec))
2347 return -EINVAL;
2348
2349 datagrams = 0;
2350
2351 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2352 if (!sock)
2353 return err;
2354
2355 err = sock_error(sock->sk);
2356 if (err)
2357 goto out_put;
2358
2359 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002360 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002361
2362 while (datagrams < vlen) {
2363 /*
2364 * No need to ask LSM for more than the first datagram.
2365 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002366 if (MSG_CMSG_COMPAT & flags) {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002367 err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
2368 &msg_sys, flags & ~MSG_WAITFORONE,
2369 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002370 if (err < 0)
2371 break;
2372 err = __put_user(err, &compat_entry->msg_len);
2373 ++compat_entry;
2374 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002375 err = ___sys_recvmsg(sock,
2376 (struct msghdr __user *)entry,
2377 &msg_sys, flags & ~MSG_WAITFORONE,
2378 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002379 if (err < 0)
2380 break;
2381 err = put_user(err, &entry->msg_len);
2382 ++entry;
2383 }
2384
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002385 if (err)
2386 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002387 ++datagrams;
2388
Brandon L Black71c5c152010-03-26 16:18:03 +00002389 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2390 if (flags & MSG_WAITFORONE)
2391 flags |= MSG_DONTWAIT;
2392
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002393 if (timeout) {
2394 ktime_get_ts(timeout);
2395 *timeout = timespec_sub(end_time, *timeout);
2396 if (timeout->tv_sec < 0) {
2397 timeout->tv_sec = timeout->tv_nsec = 0;
2398 break;
2399 }
2400
2401 /* Timeout, return less than vlen datagrams */
2402 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2403 break;
2404 }
2405
2406 /* Out of band data, return right away */
2407 if (msg_sys.msg_flags & MSG_OOB)
2408 break;
2409 }
2410
2411out_put:
2412 fput_light(sock->file, fput_needed);
2413
2414 if (err == 0)
2415 return datagrams;
2416
2417 if (datagrams != 0) {
2418 /*
2419 * We may return less entries than requested (vlen) if the
2420 * sock is non block and there aren't enough datagrams...
2421 */
2422 if (err != -EAGAIN) {
2423 /*
2424 * ... or if recvmsg returns an error after we
2425 * received some datagrams, where we record the
2426 * error to return on the next call or if the
2427 * app asks about it using getsockopt(SO_ERROR).
2428 */
2429 sock->sk->sk_err = -err;
2430 }
2431
2432 return datagrams;
2433 }
2434
2435 return err;
2436}
2437
2438SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2439 unsigned int, vlen, unsigned int, flags,
2440 struct timespec __user *, timeout)
2441{
2442 int datagrams;
2443 struct timespec timeout_sys;
2444
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002445 if (flags & MSG_CMSG_COMPAT)
2446 return -EINVAL;
2447
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002448 if (!timeout)
2449 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2450
2451 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2452 return -EFAULT;
2453
2454 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2455
2456 if (datagrams > 0 &&
2457 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2458 datagrams = -EFAULT;
2459
2460 return datagrams;
2461}
2462
2463#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002464/* Argument list sizes for sys_socketcall */
2465#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002466static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002467 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2468 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2469 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002470 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002471};
2472
Linus Torvalds1da177e2005-04-16 15:20:36 -07002473#undef AL
2474
2475/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002476 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002477 *
2478 * Argument checking cleaned up. Saved 20% in size.
2479 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002480 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002481 */
2482
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002483SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002484{
Chen Gang2950fa92013-04-07 16:55:23 +08002485 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002486 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002487 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002488 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002489
Anton Blanchard228e5482011-05-02 20:21:35 +00002490 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002491 return -EINVAL;
2492
Arjan van de Ven47379052009-09-28 12:57:44 -07002493 len = nargs[call];
2494 if (len > sizeof(a))
2495 return -EINVAL;
2496
Linus Torvalds1da177e2005-04-16 15:20:36 -07002497 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002498 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002499 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002500
Chen Gang2950fa92013-04-07 16:55:23 +08002501 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2502 if (err)
2503 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002504
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002505 a0 = a[0];
2506 a1 = a[1];
2507
2508 switch (call) {
2509 case SYS_SOCKET:
2510 err = sys_socket(a0, a1, a[2]);
2511 break;
2512 case SYS_BIND:
2513 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2514 break;
2515 case SYS_CONNECT:
2516 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2517 break;
2518 case SYS_LISTEN:
2519 err = sys_listen(a0, a1);
2520 break;
2521 case SYS_ACCEPT:
Ulrich Drepperde11def2008-11-19 15:36:14 -08002522 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2523 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002524 break;
2525 case SYS_GETSOCKNAME:
2526 err =
2527 sys_getsockname(a0, (struct sockaddr __user *)a1,
2528 (int __user *)a[2]);
2529 break;
2530 case SYS_GETPEERNAME:
2531 err =
2532 sys_getpeername(a0, (struct sockaddr __user *)a1,
2533 (int __user *)a[2]);
2534 break;
2535 case SYS_SOCKETPAIR:
2536 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2537 break;
2538 case SYS_SEND:
2539 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2540 break;
2541 case SYS_SENDTO:
2542 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2543 (struct sockaddr __user *)a[4], a[5]);
2544 break;
2545 case SYS_RECV:
2546 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2547 break;
2548 case SYS_RECVFROM:
2549 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2550 (struct sockaddr __user *)a[4],
2551 (int __user *)a[5]);
2552 break;
2553 case SYS_SHUTDOWN:
2554 err = sys_shutdown(a0, a1);
2555 break;
2556 case SYS_SETSOCKOPT:
2557 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2558 break;
2559 case SYS_GETSOCKOPT:
2560 err =
2561 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2562 (int __user *)a[4]);
2563 break;
2564 case SYS_SENDMSG:
2565 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2566 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002567 case SYS_SENDMMSG:
2568 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2569 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002570 case SYS_RECVMSG:
2571 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2572 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002573 case SYS_RECVMMSG:
2574 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2575 (struct timespec __user *)a[4]);
2576 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002577 case SYS_ACCEPT4:
2578 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2579 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002580 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002581 default:
2582 err = -EINVAL;
2583 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002584 }
2585 return err;
2586}
2587
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002588#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002589
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002590/**
2591 * sock_register - add a socket protocol handler
2592 * @ops: description of protocol
2593 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002594 * This function is called by a protocol handler that wants to
2595 * advertise its address family, and have it linked into the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002596 * socket interface. The value ops->family coresponds to the
2597 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002598 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002599int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002600{
2601 int err;
2602
2603 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08002604 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002605 return -ENOBUFS;
2606 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002607
2608 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002609 if (rcu_dereference_protected(net_families[ops->family],
2610 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002611 err = -EEXIST;
2612 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00002613 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002614 err = 0;
2615 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002616 spin_unlock(&net_family_lock);
2617
Yang Yingliang3410f222014-02-12 17:09:55 +08002618 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002619 return err;
2620}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002621EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002622
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002623/**
2624 * sock_unregister - remove a protocol handler
2625 * @family: protocol family to remove
2626 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002627 * This function is called by a protocol handler that wants to
2628 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002629 * new socket creation.
2630 *
2631 * If protocol handler is a module, then it can use module reference
2632 * counts to protect against new references. If protocol handler is not
2633 * a module then it needs to provide its own protection in
2634 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002635 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002636void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002637{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002638 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002639
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002640 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00002641 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002642 spin_unlock(&net_family_lock);
2643
2644 synchronize_rcu();
2645
Yang Yingliang3410f222014-02-12 17:09:55 +08002646 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002647}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002648EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002649
Andi Kleen77d76ea2005-12-22 12:43:42 -08002650static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651{
Nick Pigginb3e19d92011-01-07 17:50:11 +11002652 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00002653 /*
2654 * Initialize the network sysctl infrastructure.
2655 */
2656 err = net_sysctl_init();
2657 if (err)
2658 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11002659
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002661 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662 */
2663 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002664
2665 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002666 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002667 */
2668
2669 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11002670
2671 err = register_filesystem(&sock_fs_type);
2672 if (err)
2673 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11002675 if (IS_ERR(sock_mnt)) {
2676 err = PTR_ERR(sock_mnt);
2677 goto out_mount;
2678 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08002679
2680 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002681 */
2682
2683#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00002684 err = netfilter_init();
2685 if (err)
2686 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002687#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002688
Daniel Borkmann408eccc2014-04-01 16:20:23 +02002689 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00002690
Nick Pigginb3e19d92011-01-07 17:50:11 +11002691out:
2692 return err;
2693
2694out_mount:
2695 unregister_filesystem(&sock_fs_type);
2696out_fs:
2697 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002698}
2699
Andi Kleen77d76ea2005-12-22 12:43:42 -08002700core_initcall(sock_init); /* early initcall */
2701
Linus Torvalds1da177e2005-04-16 15:20:36 -07002702#ifdef CONFIG_PROC_FS
2703void socket_seq_show(struct seq_file *seq)
2704{
2705 int cpu;
2706 int counter = 0;
2707
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07002708 for_each_possible_cpu(cpu)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002709 counter += per_cpu(sockets_in_use, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002710
2711 /* It can be negative, by the way. 8) */
2712 if (counter < 0)
2713 counter = 0;
2714
2715 seq_printf(seq, "sockets: used %d\n", counter);
2716}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002717#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002718
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002719#ifdef CONFIG_COMPAT
Arnd Bergmann6b960182009-11-06 23:10:54 -08002720static int do_siocgstamp(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002721 unsigned int cmd, void __user *up)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002722{
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002723 mm_segment_t old_fs = get_fs();
2724 struct timeval ktv;
2725 int err;
2726
2727 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002728 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002729 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002730 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002731 err = compat_put_timeval(&ktv, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002732
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002733 return err;
2734}
2735
Arnd Bergmann6b960182009-11-06 23:10:54 -08002736static int do_siocgstampns(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002737 unsigned int cmd, void __user *up)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002738{
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002739 mm_segment_t old_fs = get_fs();
2740 struct timespec kts;
2741 int err;
2742
2743 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002744 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002745 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002746 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002747 err = compat_put_timespec(&kts, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002748
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002749 return err;
2750}
2751
Arnd Bergmann6b960182009-11-06 23:10:54 -08002752static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002753{
2754 struct ifreq __user *uifr;
2755 int err;
2756
2757 uifr = compat_alloc_user_space(sizeof(struct ifreq));
Arnd Bergmann6b960182009-11-06 23:10:54 -08002758 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002759 return -EFAULT;
2760
Arnd Bergmann6b960182009-11-06 23:10:54 -08002761 err = dev_ioctl(net, SIOCGIFNAME, uifr);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002762 if (err)
2763 return err;
2764
Arnd Bergmann6b960182009-11-06 23:10:54 -08002765 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002766 return -EFAULT;
2767
2768 return 0;
2769}
2770
Arnd Bergmann6b960182009-11-06 23:10:54 -08002771static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002772{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002773 struct compat_ifconf ifc32;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002774 struct ifconf ifc;
2775 struct ifconf __user *uifc;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002776 struct compat_ifreq __user *ifr32;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002777 struct ifreq __user *ifr;
2778 unsigned int i, j;
2779 int err;
2780
Arnd Bergmann6b960182009-11-06 23:10:54 -08002781 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002782 return -EFAULT;
2783
Mathias Krause43da5f22012-08-15 11:31:57 +00002784 memset(&ifc, 0, sizeof(ifc));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002785 if (ifc32.ifcbuf == 0) {
2786 ifc32.ifc_len = 0;
2787 ifc.ifc_len = 0;
2788 ifc.ifc_req = NULL;
2789 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2790 } else {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002791 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2792 sizeof(struct ifreq);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002793 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2794 ifc.ifc_len = len;
2795 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2796 ifr32 = compat_ptr(ifc32.ifcbuf);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002797 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
Arnd Bergmann6b960182009-11-06 23:10:54 -08002798 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002799 return -EFAULT;
2800 ifr++;
2801 ifr32++;
2802 }
2803 }
2804 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2805 return -EFAULT;
2806
Arnd Bergmann6b960182009-11-06 23:10:54 -08002807 err = dev_ioctl(net, SIOCGIFCONF, uifc);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002808 if (err)
2809 return err;
2810
2811 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2812 return -EFAULT;
2813
2814 ifr = ifc.ifc_req;
2815 ifr32 = compat_ptr(ifc32.ifcbuf);
2816 for (i = 0, j = 0;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002817 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2818 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2819 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002820 return -EFAULT;
2821 ifr32++;
2822 ifr++;
2823 }
2824
2825 if (ifc32.ifcbuf == 0) {
2826 /* Translate from 64-bit structure multiple to
2827 * a 32-bit one.
2828 */
2829 i = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002830 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002831 ifc32.ifc_len = i;
2832 } else {
2833 ifc32.ifc_len = i;
2834 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08002835 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002836 return -EFAULT;
2837
2838 return 0;
2839}
2840
Arnd Bergmann6b960182009-11-06 23:10:54 -08002841static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002842{
Ben Hutchings3a7da392011-03-17 07:34:32 +00002843 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2844 bool convert_in = false, convert_out = false;
2845 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2846 struct ethtool_rxnfc __user *rxnfc;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002847 struct ifreq __user *ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002848 u32 rule_cnt = 0, actual_rule_cnt;
2849 u32 ethcmd;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002850 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002851 int ret;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002852
2853 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2854 return -EFAULT;
2855
Ben Hutchings3a7da392011-03-17 07:34:32 +00002856 compat_rxnfc = compat_ptr(data);
2857
2858 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002859 return -EFAULT;
2860
Ben Hutchings3a7da392011-03-17 07:34:32 +00002861 /* Most ethtool structures are defined without padding.
2862 * Unfortunately struct ethtool_rxnfc is an exception.
2863 */
2864 switch (ethcmd) {
2865 default:
2866 break;
2867 case ETHTOOL_GRXCLSRLALL:
2868 /* Buffer size is variable */
2869 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2870 return -EFAULT;
2871 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2872 return -ENOMEM;
2873 buf_size += rule_cnt * sizeof(u32);
2874 /* fall through */
2875 case ETHTOOL_GRXRINGS:
2876 case ETHTOOL_GRXCLSRLCNT:
2877 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00002878 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002879 convert_out = true;
2880 /* fall through */
2881 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002882 buf_size += sizeof(struct ethtool_rxnfc);
2883 convert_in = true;
2884 break;
2885 }
2886
2887 ifr = compat_alloc_user_space(buf_size);
Stephen Hemminger954b1242013-02-11 06:22:28 +00002888 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
Ben Hutchings3a7da392011-03-17 07:34:32 +00002889
2890 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2891 return -EFAULT;
2892
2893 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2894 &ifr->ifr_ifru.ifru_data))
2895 return -EFAULT;
2896
2897 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00002898 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00002899 * fs.ring_cookie and at the end of fs, but nowhere else.
2900 */
Alexander Duyck127fe532011-04-08 18:01:59 +00002901 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2902 sizeof(compat_rxnfc->fs.m_ext) !=
2903 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2904 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00002905 BUILD_BUG_ON(
2906 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2907 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2908 offsetof(struct ethtool_rxnfc, fs.location) -
2909 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2910
2911 if (copy_in_user(rxnfc, compat_rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002912 (void __user *)(&rxnfc->fs.m_ext + 1) -
2913 (void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002914 copy_in_user(&rxnfc->fs.ring_cookie,
2915 &compat_rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002916 (void __user *)(&rxnfc->fs.location + 1) -
2917 (void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002918 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2919 sizeof(rxnfc->rule_cnt)))
2920 return -EFAULT;
2921 }
2922
2923 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2924 if (ret)
2925 return ret;
2926
2927 if (convert_out) {
2928 if (copy_in_user(compat_rxnfc, rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002929 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2930 (const void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002931 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2932 &rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002933 (const void __user *)(&rxnfc->fs.location + 1) -
2934 (const void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002935 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2936 sizeof(rxnfc->rule_cnt)))
2937 return -EFAULT;
2938
2939 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2940 /* As an optimisation, we only copy the actual
2941 * number of rules that the underlying
2942 * function returned. Since Mallory might
2943 * change the rule count in user memory, we
2944 * check that it is less than the rule count
2945 * originally given (as the user buffer size),
2946 * which has been range-checked.
2947 */
2948 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2949 return -EFAULT;
2950 if (actual_rule_cnt < rule_cnt)
2951 rule_cnt = actual_rule_cnt;
2952 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2953 &rxnfc->rule_locs[0],
2954 rule_cnt * sizeof(u32)))
2955 return -EFAULT;
2956 }
2957 }
2958
2959 return 0;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002960}
2961
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002962static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2963{
2964 void __user *uptr;
2965 compat_uptr_t uptr32;
2966 struct ifreq __user *uifr;
2967
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002968 uifr = compat_alloc_user_space(sizeof(*uifr));
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002969 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2970 return -EFAULT;
2971
2972 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2973 return -EFAULT;
2974
2975 uptr = compat_ptr(uptr32);
2976
2977 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2978 return -EFAULT;
2979
2980 return dev_ioctl(net, SIOCWANDEV, uifr);
2981}
2982
Arnd Bergmann6b960182009-11-06 23:10:54 -08002983static int bond_ioctl(struct net *net, unsigned int cmd,
2984 struct compat_ifreq __user *ifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002985{
2986 struct ifreq kifr;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002987 mm_segment_t old_fs;
2988 int err;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002989
2990 switch (cmd) {
2991 case SIOCBONDENSLAVE:
2992 case SIOCBONDRELEASE:
2993 case SIOCBONDSETHWADDR:
2994 case SIOCBONDCHANGEACTIVE:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002995 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002996 return -EFAULT;
2997
2998 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002999 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003000 err = dev_ioctl(net, cmd,
3001 (struct ifreq __user __force *) &kifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003002 set_fs(old_fs);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003003
3004 return err;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003005 default:
Linus Torvalds07d106d2012-01-05 15:40:12 -08003006 return -ENOIOCTLCMD;
Joe Perchesccbd6a52010-05-14 10:58:26 +00003007 }
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003008}
3009
Ben Hutchings590d4692013-11-18 17:04:13 +00003010/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3011static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08003012 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003013{
3014 struct ifreq __user *u_ifreq64;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003015 char tmp_buf[IFNAMSIZ];
3016 void __user *data64;
3017 u32 data32;
3018
3019 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
3020 IFNAMSIZ))
3021 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00003022 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003023 return -EFAULT;
3024 data64 = compat_ptr(data32);
3025
3026 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
3027
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003028 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
3029 IFNAMSIZ))
3030 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00003031 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003032 return -EFAULT;
3033
Arnd Bergmann6b960182009-11-06 23:10:54 -08003034 return dev_ioctl(net, cmd, u_ifreq64);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003035}
3036
Arnd Bergmann6b960182009-11-06 23:10:54 -08003037static int dev_ifsioc(struct net *net, struct socket *sock,
3038 unsigned int cmd, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003039{
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003040 struct ifreq __user *uifr;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003041 int err;
3042
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003043 uifr = compat_alloc_user_space(sizeof(*uifr));
3044 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
3045 return -EFAULT;
3046
3047 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
3048
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003049 if (!err) {
3050 switch (cmd) {
3051 case SIOCGIFFLAGS:
3052 case SIOCGIFMETRIC:
3053 case SIOCGIFMTU:
3054 case SIOCGIFMEM:
3055 case SIOCGIFHWADDR:
3056 case SIOCGIFINDEX:
3057 case SIOCGIFADDR:
3058 case SIOCGIFBRDADDR:
3059 case SIOCGIFDSTADDR:
3060 case SIOCGIFNETMASK:
Arnd Bergmannfab25322009-11-08 20:56:21 -08003061 case SIOCGIFPFLAGS:
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003062 case SIOCGIFTXQLEN:
Arnd Bergmannfab25322009-11-08 20:56:21 -08003063 case SIOCGMIIPHY:
3064 case SIOCGMIIREG:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003065 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003066 err = -EFAULT;
3067 break;
3068 }
3069 }
3070 return err;
3071}
3072
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003073static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
3074 struct compat_ifreq __user *uifr32)
3075{
3076 struct ifreq ifr;
3077 struct compat_ifmap __user *uifmap32;
3078 mm_segment_t old_fs;
3079 int err;
3080
3081 uifmap32 = &uifr32->ifr_ifru.ifru_map;
3082 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003083 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3084 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3085 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3086 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
3087 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
3088 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003089 if (err)
3090 return -EFAULT;
3091
3092 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003093 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003094 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003095 set_fs(old_fs);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003096
3097 if (cmd == SIOCGIFMAP && !err) {
3098 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003099 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3100 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3101 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3102 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
3103 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
3104 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003105 if (err)
3106 err = -EFAULT;
3107 }
3108 return err;
3109}
3110
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003111struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003112 u32 rt_pad1;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003113 struct sockaddr rt_dst; /* target address */
3114 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3115 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003116 unsigned short rt_flags;
3117 short rt_pad2;
3118 u32 rt_pad3;
3119 unsigned char rt_tos;
3120 unsigned char rt_class;
3121 short rt_pad4;
3122 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003123 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003124 u32 rt_mtu; /* per route MTU/Window */
3125 u32 rt_window; /* Window clamping */
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003126 unsigned short rt_irtt; /* Initial RTT */
3127};
3128
3129struct in6_rtmsg32 {
3130 struct in6_addr rtmsg_dst;
3131 struct in6_addr rtmsg_src;
3132 struct in6_addr rtmsg_gateway;
3133 u32 rtmsg_type;
3134 u16 rtmsg_dst_len;
3135 u16 rtmsg_src_len;
3136 u32 rtmsg_metric;
3137 u32 rtmsg_info;
3138 u32 rtmsg_flags;
3139 s32 rtmsg_ifindex;
3140};
3141
Arnd Bergmann6b960182009-11-06 23:10:54 -08003142static int routing_ioctl(struct net *net, struct socket *sock,
3143 unsigned int cmd, void __user *argp)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003144{
3145 int ret;
3146 void *r = NULL;
3147 struct in6_rtmsg r6;
3148 struct rtentry r4;
3149 char devname[16];
3150 u32 rtdev;
3151 mm_segment_t old_fs = get_fs();
3152
Arnd Bergmann6b960182009-11-06 23:10:54 -08003153 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3154 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003155 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003156 3 * sizeof(struct in6_addr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003157 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3158 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3159 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3160 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3161 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3162 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3163 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003164
3165 r = (void *) &r6;
3166 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003167 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003168 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003169 3 * sizeof(struct sockaddr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003170 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3171 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3172 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3173 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3174 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3175 ret |= get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003176 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003177 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003178 r4.rt_dev = (char __user __force *)devname;
3179 devname[15] = 0;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003180 } else
3181 r4.rt_dev = NULL;
3182
3183 r = (void *) &r4;
3184 }
3185
3186 if (ret) {
3187 ret = -EFAULT;
3188 goto out;
3189 }
3190
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003191 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003192 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003193 set_fs(old_fs);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003194
3195out:
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003196 return ret;
3197}
3198
3199/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3200 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003201 * use compatible ioctls
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003202 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003203static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003204{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003205 compat_ulong_t tmp;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003206
Arnd Bergmann6b960182009-11-06 23:10:54 -08003207 if (get_user(tmp, argp))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003208 return -EFAULT;
3209 if (tmp == BRCTL_GET_VERSION)
3210 return BRCTL_VERSION + 1;
3211 return -EINVAL;
3212}
3213
Arnd Bergmann6b960182009-11-06 23:10:54 -08003214static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3215 unsigned int cmd, unsigned long arg)
3216{
3217 void __user *argp = compat_ptr(arg);
3218 struct sock *sk = sock->sk;
3219 struct net *net = sock_net(sk);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003220
Arnd Bergmann6b960182009-11-06 23:10:54 -08003221 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003222 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003223
Arnd Bergmann6b960182009-11-06 23:10:54 -08003224 switch (cmd) {
3225 case SIOCSIFBR:
3226 case SIOCGIFBR:
3227 return old_bridge_ioctl(argp);
3228 case SIOCGIFNAME:
3229 return dev_ifname32(net, argp);
3230 case SIOCGIFCONF:
3231 return dev_ifconf(net, argp);
3232 case SIOCETHTOOL:
3233 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003234 case SIOCWANDEV:
3235 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003236 case SIOCGIFMAP:
3237 case SIOCSIFMAP:
3238 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003239 case SIOCBONDENSLAVE:
3240 case SIOCBONDRELEASE:
3241 case SIOCBONDSETHWADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003242 case SIOCBONDCHANGEACTIVE:
3243 return bond_ioctl(net, cmd, argp);
3244 case SIOCADDRT:
3245 case SIOCDELRT:
3246 return routing_ioctl(net, sock, cmd, argp);
3247 case SIOCGSTAMP:
3248 return do_siocgstamp(net, sock, cmd, argp);
3249 case SIOCGSTAMPNS:
3250 return do_siocgstampns(net, sock, cmd, argp);
Ben Hutchings590d4692013-11-18 17:04:13 +00003251 case SIOCBONDSLAVEINFOQUERY:
3252 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003253 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003254 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003255 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003256
Arnd Bergmann6b960182009-11-06 23:10:54 -08003257 case FIOSETOWN:
3258 case SIOCSPGRP:
3259 case FIOGETOWN:
3260 case SIOCGPGRP:
3261 case SIOCBRADDBR:
3262 case SIOCBRDELBR:
3263 case SIOCGIFVLAN:
3264 case SIOCSIFVLAN:
3265 case SIOCADDDLCI:
3266 case SIOCDELDLCI:
3267 return sock_ioctl(file, cmd, arg);
3268
3269 case SIOCGIFFLAGS:
3270 case SIOCSIFFLAGS:
3271 case SIOCGIFMETRIC:
3272 case SIOCSIFMETRIC:
3273 case SIOCGIFMTU:
3274 case SIOCSIFMTU:
3275 case SIOCGIFMEM:
3276 case SIOCSIFMEM:
3277 case SIOCGIFHWADDR:
3278 case SIOCSIFHWADDR:
3279 case SIOCADDMULTI:
3280 case SIOCDELMULTI:
3281 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003282 case SIOCGIFADDR:
3283 case SIOCSIFADDR:
3284 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003285 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003286 case SIOCGIFBRDADDR:
3287 case SIOCSIFBRDADDR:
3288 case SIOCGIFDSTADDR:
3289 case SIOCSIFDSTADDR:
3290 case SIOCGIFNETMASK:
3291 case SIOCSIFNETMASK:
3292 case SIOCSIFPFLAGS:
3293 case SIOCGIFPFLAGS:
3294 case SIOCGIFTXQLEN:
3295 case SIOCSIFTXQLEN:
3296 case SIOCBRADDIF:
3297 case SIOCBRDELIF:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003298 case SIOCSIFNAME:
3299 case SIOCGMIIPHY:
3300 case SIOCGMIIREG:
3301 case SIOCSMIIREG:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003302 return dev_ifsioc(net, sock, cmd, argp);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003303
Arnd Bergmann6b960182009-11-06 23:10:54 -08003304 case SIOCSARP:
3305 case SIOCGARP:
3306 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003307 case SIOCATMARK:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003308 return sock_do_ioctl(net, sock, cmd, arg);
3309 }
3310
Arnd Bergmann6b960182009-11-06 23:10:54 -08003311 return -ENOIOCTLCMD;
3312}
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003313
Eric Dumazet95c96172012-04-15 05:58:06 +00003314static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003315 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003316{
3317 struct socket *sock = file->private_data;
3318 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003319 struct sock *sk;
3320 struct net *net;
3321
3322 sk = sock->sk;
3323 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003324
3325 if (sock->ops->compat_ioctl)
3326 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3327
David S. Miller87de87d2008-06-03 09:14:03 -07003328 if (ret == -ENOIOCTLCMD &&
3329 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3330 ret = compat_wext_handle_ioctl(net, cmd, arg);
3331
Arnd Bergmann6b960182009-11-06 23:10:54 -08003332 if (ret == -ENOIOCTLCMD)
3333 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3334
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003335 return ret;
3336}
3337#endif
3338
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003339int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3340{
3341 return sock->ops->bind(sock, addr, addrlen);
3342}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003343EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003344
3345int kernel_listen(struct socket *sock, int backlog)
3346{
3347 return sock->ops->listen(sock, backlog);
3348}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003349EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003350
3351int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3352{
3353 struct sock *sk = sock->sk;
3354 int err;
3355
3356 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3357 newsock);
3358 if (err < 0)
3359 goto done;
3360
3361 err = sock->ops->accept(sock, *newsock, flags);
3362 if (err < 0) {
3363 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003364 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003365 goto done;
3366 }
3367
3368 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003369 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003370
3371done:
3372 return err;
3373}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003374EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003375
3376int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003377 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003378{
3379 return sock->ops->connect(sock, addr, addrlen, flags);
3380}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003381EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003382
3383int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3384 int *addrlen)
3385{
3386 return sock->ops->getname(sock, addr, addrlen, 0);
3387}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003388EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003389
3390int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3391 int *addrlen)
3392{
3393 return sock->ops->getname(sock, addr, addrlen, 1);
3394}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003395EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003396
3397int kernel_getsockopt(struct socket *sock, int level, int optname,
3398 char *optval, int *optlen)
3399{
3400 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003401 char __user *uoptval;
3402 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003403 int err;
3404
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003405 uoptval = (char __user __force *) optval;
3406 uoptlen = (int __user __force *) optlen;
3407
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003408 set_fs(KERNEL_DS);
3409 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003410 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003411 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003412 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3413 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003414 set_fs(oldfs);
3415 return err;
3416}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003417EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003418
3419int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003420 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003421{
3422 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003423 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003424 int err;
3425
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003426 uoptval = (char __user __force *) optval;
3427
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003428 set_fs(KERNEL_DS);
3429 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003430 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003431 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003432 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003433 optlen);
3434 set_fs(oldfs);
3435 return err;
3436}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003437EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003438
3439int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3440 size_t size, int flags)
3441{
3442 if (sock->ops->sendpage)
3443 return sock->ops->sendpage(sock, page, offset, size, flags);
3444
3445 return sock_no_sendpage(sock, page, offset, size, flags);
3446}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003447EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003448
3449int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3450{
3451 mm_segment_t oldfs = get_fs();
3452 int err;
3453
3454 set_fs(KERNEL_DS);
3455 err = sock->ops->ioctl(sock, cmd, arg);
3456 set_fs(oldfs);
3457
3458 return err;
3459}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003460EXPORT_SYMBOL(kernel_sock_ioctl);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003461
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003462int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3463{
3464 return sock->ops->shutdown(sock, how);
3465}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003466EXPORT_SYMBOL(kernel_sock_shutdown);