blob: e1278d7e1d5ddc33024480d71bc095c03b978fa3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NET An implementation of the SOCKET network access protocol.
3 *
4 * Version: @(#)socket.c 1.1.93 18/02/95
5 *
6 * Authors: Orest Zborowski, <obz@Kodak.COM>
Jesper Juhl02c30a82005-05-05 16:16:16 -07007 * Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
9 *
10 * Fixes:
11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
12 * shutdown()
13 * Alan Cox : verify_area() fixes
14 * Alan Cox : Removed DDI
15 * Jonathan Kamens : SOCK_DGRAM reconnect bug
16 * Alan Cox : Moved a load of checks to the very
17 * top level.
18 * Alan Cox : Move address structures to/from user
19 * mode above the protocol layers.
20 * Rob Janssen : Allow 0 length sends.
21 * Alan Cox : Asynchronous I/O support (cribbed from the
22 * tty drivers).
23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
24 * Jeff Uphoff : Made max number of sockets command-line
25 * configurable.
26 * Matti Aarnio : Made the number of sockets dynamic,
27 * to be allocated when needed, and mr.
28 * Uphoff's max is used as max to be
29 * allowed to allocate.
30 * Linus : Argh. removed all the socket allocation
31 * altogether: it's in the inode now.
32 * Alan Cox : Made sock_alloc()/sock_release() public
33 * for NetROM and future kernel nfsd type
34 * stuff.
35 * Alan Cox : sendmsg/recvmsg basics.
36 * Tom Dyas : Export net symbols.
37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
38 * Alan Cox : Added thread locking to sys_* calls
39 * for sockets. May have errors at the
40 * moment.
41 * Kevin Buhr : Fixed the dumb errors in the above.
42 * Andi Kleen : Some small cleanups, optimizations,
43 * and fixed a copy_from_user() bug.
44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
Stephen Hemminger89bddce2006-09-01 00:19:31 -070045 * Tigran Aivazian : Made listen(2) backlog sanity checks
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 * protocol-independent
47 *
48 *
49 * This program is free software; you can redistribute it and/or
50 * modify it under the terms of the GNU General Public License
51 * as published by the Free Software Foundation; either version
52 * 2 of the License, or (at your option) any later version.
53 *
54 *
55 * This module is effectively the top level interface to the BSD socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -070056 * paradigm.
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 *
58 * Based upon Swansea University Computer Society NET3.039
59 */
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/socket.h>
63#include <linux/file.h>
64#include <linux/net.h>
65#include <linux/interrupt.h>
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -070066#include <linux/thread_info.h>
Stephen Hemminger55737fd2006-09-01 00:23:39 -070067#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <linux/netdevice.h>
69#include <linux/proc_fs.h>
70#include <linux/seq_file.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080071#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#include <linux/if_bridge.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030073#include <linux/if_frad.h>
74#include <linux/if_vlan.h>
Daniel Borkmann408eccc2014-04-01 16:20:23 +020075#include <linux/ptp_classify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#include <linux/init.h>
77#include <linux/poll.h>
78#include <linux/cache.h>
79#include <linux/module.h>
80#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#include <linux/mount.h>
82#include <linux/security.h>
83#include <linux/syscalls.h>
84#include <linux/compat.h>
85#include <linux/kmod.h>
David Woodhouse3ec3b2f2005-05-17 12:08:48 +010086#include <linux/audit.h>
Adrian Bunkd86b5e02006-01-21 00:46:55 +010087#include <linux/wireless.h>
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -070088#include <linux/nsproxy.h>
Nick Black1fd7317d2009-09-22 16:43:33 -070089#include <linux/magic.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090090#include <linux/slab.h>
Masatake YAMATO600e1772012-08-29 10:44:29 +000091#include <linux/xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93#include <asm/uaccess.h>
94#include <asm/unistd.h>
95
96#include <net/compat.h>
David S. Miller87de87d2008-06-03 09:14:03 -070097#include <net/wext.h>
Herbert Xuf8451722010-05-24 00:12:34 -070098#include <net/cls_cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100#include <net/sock.h>
101#include <linux/netfilter.h>
102
Arnd Bergmann6b960182009-11-06 23:10:54 -0800103#include <linux/if_tun.h>
104#include <linux/ipv6_route.h>
105#include <linux/route.h>
Arnd Bergmann6b960182009-11-06 23:10:54 -0800106#include <linux/sockios.h>
107#include <linux/atalk.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +0300108#include <net/busy_poll.h>
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400109#include <linux/errqueue.h>
Eliezer Tamir06021292013-06-10 11:39:50 +0300110
Cong Wange0d10952013-08-01 11:10:25 +0800111#ifdef CONFIG_NET_RX_BUSY_POLL
Eliezer Tamir64b0dc52013-07-10 17:13:36 +0300112unsigned int sysctl_net_busy_read __read_mostly;
113unsigned int sysctl_net_busy_poll __read_mostly;
Eliezer Tamir06021292013-06-10 11:39:50 +0300114#endif
Arnd Bergmann6b960182009-11-06 23:10:54 -0800115
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,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 .release = sock_close,
154 .fasync = sock_fasync,
Jens Axboe5274f052006-03-30 15:15:30 +0200155 .sendpage = sock_sendpage,
156 .splice_write = generic_splice_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800157 .splice_read = sock_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158};
159
160/*
161 * The protocol list. Each protocol is registered in here.
162 */
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164static DEFINE_SPINLOCK(net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +0000165static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167/*
168 * Statistics counters of the socket lists
169 */
170
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700171static DEFINE_PER_CPU(int, sockets_in_use);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700174 * Support routines.
175 * Move socket addresses back and forth across the kernel/user
176 * divide and look after the messy bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 */
178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179/**
180 * move_addr_to_kernel - copy a socket address into kernel space
181 * @uaddr: Address in user space
182 * @kaddr: Address in kernel space
183 * @ulen: Length in user space
184 *
185 * The address is copied into kernel space. If the provided address is
186 * too long an error code of -EINVAL is returned. If the copy gives
187 * invalid addresses -EFAULT is returned. On a success 0 is returned.
188 */
189
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000190int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700192 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700194 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700196 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100198 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199}
200
201/**
202 * move_addr_to_user - copy an address to user space
203 * @kaddr: kernel space address
204 * @klen: length of address in kernel
205 * @uaddr: user space address
206 * @ulen: pointer to user length field
207 *
208 * The value pointed to by ulen on entry is the buffer length available.
209 * This is overwritten with the buffer space used. -EINVAL is returned
210 * if an overlong buffer is specified or a negative buffer size. -EFAULT
211 * is returned if either the buffer or the length field are not
212 * accessible.
213 * After copying the data up to the limit the user specifies, the true
214 * length of the data is written over the length limit the user
215 * specified. Zero is returned for a success.
216 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700217
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000218static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
stephen hemminger11165f12010-10-18 14:27:29 +0000219 void __user *uaddr, int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
221 int err;
222 int len;
223
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100224 BUG_ON(klen > sizeof(struct sockaddr_storage));
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700225 err = get_user(len, ulen);
226 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700228 if (len > klen)
229 len = klen;
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100230 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700232 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500233 if (audit_sockaddr(klen, kaddr))
234 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700235 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 return -EFAULT;
237 }
238 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700239 * "fromlen shall refer to the value before truncation.."
240 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 */
242 return __put_user(klen, ulen);
243}
244
Christoph Lametere18b8902006-12-06 20:33:20 -0800245static struct kmem_cache *sock_inode_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
247static struct inode *sock_alloc_inode(struct super_block *sb)
248{
249 struct socket_alloc *ei;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000250 struct socket_wq *wq;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700251
Christoph Lametere94b1762006-12-06 20:33:17 -0800252 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 if (!ei)
254 return NULL;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000255 wq = kmalloc(sizeof(*wq), GFP_KERNEL);
256 if (!wq) {
Eric Dumazet43815482010-04-29 11:01:49 +0000257 kmem_cache_free(sock_inode_cachep, ei);
258 return NULL;
259 }
Eric Dumazeteaefd112011-02-18 03:26:36 +0000260 init_waitqueue_head(&wq->wait);
261 wq->fasync_list = NULL;
262 RCU_INIT_POINTER(ei->socket.wq, wq);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700263
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 ei->socket.state = SS_UNCONNECTED;
265 ei->socket.flags = 0;
266 ei->socket.ops = NULL;
267 ei->socket.sk = NULL;
268 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
270 return &ei->vfs_inode;
271}
272
273static void sock_destroy_inode(struct inode *inode)
274{
Eric Dumazet43815482010-04-29 11:01:49 +0000275 struct socket_alloc *ei;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000276 struct socket_wq *wq;
Eric Dumazet43815482010-04-29 11:01:49 +0000277
278 ei = container_of(inode, struct socket_alloc, vfs_inode);
Eric Dumazeteaefd112011-02-18 03:26:36 +0000279 wq = rcu_dereference_protected(ei->socket.wq, 1);
Lai Jiangshan61845222011-03-18 12:10:25 +0800280 kfree_rcu(wq, rcu);
Eric Dumazet43815482010-04-29 11:01:49 +0000281 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282}
283
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700284static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700286 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Christoph Lametera35afb82007-05-16 22:10:57 -0700288 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291static int init_inodecache(void)
292{
293 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700294 sizeof(struct socket_alloc),
295 0,
296 (SLAB_HWCACHE_ALIGN |
297 SLAB_RECLAIM_ACCOUNT |
298 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900299 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 if (sock_inode_cachep == NULL)
301 return -ENOMEM;
302 return 0;
303}
304
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700305static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700306 .alloc_inode = sock_alloc_inode,
307 .destroy_inode = sock_destroy_inode,
308 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309};
310
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700311/*
312 * sockfs_dname() is called from d_path().
313 */
314static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
315{
316 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
317 dentry->d_inode->i_ino);
318}
319
Al Viro3ba13d12009-02-20 06:02:22 +0000320static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700321 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322};
323
Al Viroc74a1cb2011-01-12 16:59:34 -0500324static struct dentry *sockfs_mount(struct file_system_type *fs_type,
325 int flags, const char *dev_name, void *data)
326{
327 return mount_pseudo(fs_type, "socket:", &sockfs_ops,
328 &sockfs_dentry_operations, SOCKFS_MAGIC);
329}
330
331static struct vfsmount *sock_mnt __read_mostly;
332
333static struct file_system_type sock_fs_type = {
334 .name = "sockfs",
335 .mount = sockfs_mount,
336 .kill_sb = kill_anon_super,
337};
338
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339/*
340 * Obtains the first available file descriptor and sets it up for use.
341 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800342 * These functions create file structures and maps them to fd space
343 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 * and file struct implicitly stored in sock->file.
345 * Note that another thread may close file descriptor before we return
346 * from this function. We use the fact that now we do not refer
347 * to socket after mapping. If one day we will need it, this
348 * function will increment ref. count on file by 1.
349 *
350 * In any case returned fd MAY BE not valid!
351 * This race condition is unavoidable
352 * with shared fd spaces, we cannot solve it inside kernel,
353 * but we take care of internal coherence yet.
354 */
355
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700356struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357{
Al Viro7cbe66b2009-08-05 19:59:08 +0400358 struct qstr name = { .name = "" };
Al Viro2c48b9c2009-08-09 00:52:35 +0400359 struct path path;
Al Viro7cbe66b2009-08-05 19:59:08 +0400360 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800361
Masatake YAMATO600e1772012-08-29 10:44:29 +0000362 if (dname) {
363 name.name = dname;
364 name.len = strlen(name.name);
365 } else if (sock->sk) {
366 name.name = sock->sk->sk_prot_creator->name;
367 name.len = strlen(name.name);
368 }
Nick Piggin4b936882011-01-07 17:50:07 +1100369 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
Al Viro28407632012-08-17 23:54:15 -0400370 if (unlikely(!path.dentry))
371 return ERR_PTR(-ENOMEM);
Al Viro2c48b9c2009-08-09 00:52:35 +0400372 path.mnt = mntget(sock_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
Al Viro2c48b9c2009-08-09 00:52:35 +0400374 d_instantiate(path.dentry, SOCK_INODE(sock));
Al Virocc3808f2009-08-06 09:43:59 +0400375
Al Viro2c48b9c2009-08-09 00:52:35 +0400376 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
Al Virocc3808f2009-08-06 09:43:59 +0400377 &socket_file_ops);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700378 if (unlikely(IS_ERR(file))) {
Al Virocc3808f2009-08-06 09:43:59 +0400379 /* drop dentry, keep inode */
Al Viro7de9c6ee2010-10-23 11:11:40 -0400380 ihold(path.dentry->d_inode);
Al Viro2c48b9c2009-08-09 00:52:35 +0400381 path_put(&path);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700382 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400383 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800384
385 sock->file = file;
Ulrich Drepper77d27202008-07-23 21:29:35 -0700386 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800387 file->private_data = sock;
Al Viro28407632012-08-17 23:54:15 -0400388 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800389}
Al Viro56b31d12012-08-18 00:25:51 -0400390EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800391
Al Viro56b31d12012-08-18 00:25:51 -0400392static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800393{
394 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400395 int fd = get_unused_fd_flags(flags);
396 if (unlikely(fd < 0))
397 return fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800398
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700399 newfile = sock_alloc_file(sock, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -0400400 if (likely(!IS_ERR(newfile))) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800401 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400402 return fd;
403 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400404
Al Viro28407632012-08-17 23:54:15 -0400405 put_unused_fd(fd);
406 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407}
408
John Fastabend406a3c62012-07-20 10:39:25 +0000409struct socket *sock_from_file(struct file *file, int *err)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800410{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800411 if (file->f_op == &socket_file_ops)
412 return file->private_data; /* set in sock_map_fd */
413
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800414 *err = -ENOTSOCK;
415 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800416}
John Fastabend406a3c62012-07-20 10:39:25 +0000417EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800418
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700420 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 * @fd: file handle
422 * @err: pointer to an error code return
423 *
424 * The file handle passed in is locked and the socket it is bound
425 * too is returned. If an error occurs the err pointer is overwritten
426 * with a negative errno code and NULL is returned. The function checks
427 * for both invalid handles and passing a handle which is not a socket.
428 *
429 * On a success the socket object pointer is returned.
430 */
431
432struct socket *sockfd_lookup(int fd, int *err)
433{
434 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 struct socket *sock;
436
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700437 file = fget(fd);
438 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 *err = -EBADF;
440 return NULL;
441 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700442
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800443 sock = sock_from_file(file, err);
444 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 return sock;
447}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700448EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800450static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
451{
Al Viro00e188e2014-03-03 23:48:18 -0500452 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800453 struct socket *sock;
454
Hua Zhong36725582006-04-19 15:25:02 -0700455 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500456 if (f.file) {
457 sock = sock_from_file(f.file, err);
458 if (likely(sock)) {
459 *fput_needed = f.flags;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800460 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500461 }
462 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800463 }
464 return NULL;
465}
466
Masatake YAMATO600e1772012-08-29 10:44:29 +0000467#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
468#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
469#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
470static ssize_t sockfs_getxattr(struct dentry *dentry,
471 const char *name, void *value, size_t size)
472{
473 const char *proto_name;
474 size_t proto_size;
475 int error;
476
477 error = -ENODATA;
478 if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) {
479 proto_name = dentry->d_name.name;
480 proto_size = strlen(proto_name);
481
482 if (value) {
483 error = -ERANGE;
484 if (proto_size + 1 > size)
485 goto out;
486
487 strncpy(value, proto_name, proto_size + 1);
488 }
489 error = proto_size + 1;
490 }
491
492out:
493 return error;
494}
495
496static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
497 size_t size)
498{
499 ssize_t len;
500 ssize_t used = 0;
501
502 len = security_inode_listsecurity(dentry->d_inode, buffer, size);
503 if (len < 0)
504 return len;
505 used += len;
506 if (buffer) {
507 if (size < used)
508 return -ERANGE;
509 buffer += len;
510 }
511
512 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
513 used += len;
514 if (buffer) {
515 if (size < used)
516 return -ERANGE;
517 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
518 buffer += len;
519 }
520
521 return used;
522}
523
524static const struct inode_operations sockfs_inode_ops = {
525 .getxattr = sockfs_getxattr,
526 .listxattr = sockfs_listxattr,
527};
528
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529/**
530 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700531 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 * Allocate a new inode and socket object. The two are bound together
533 * and initialised. The socket is then returned. If we are out of inodes
534 * NULL is returned.
535 */
536
537static struct socket *sock_alloc(void)
538{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700539 struct inode *inode;
540 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200542 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 if (!inode)
544 return NULL;
545
546 sock = SOCKET_I(inode);
547
Eric Dumazet29a020d2009-09-15 02:39:20 -0700548 kmemcheck_annotate_bitfield(sock, type);
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400549 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700550 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100551 inode->i_uid = current_fsuid();
552 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000553 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
Alex Shi19e8d692012-05-14 14:15:31 -0700555 this_cpu_add(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 return sock;
557}
558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559/**
560 * sock_release - close a socket
561 * @sock: socket to close
562 *
563 * The socket is released from the protocol stack if it has a release
564 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700565 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568void sock_release(struct socket *sock)
569{
570 if (sock->ops) {
571 struct module *owner = sock->ops->owner;
572
573 sock->ops->release(sock);
574 sock->ops = NULL;
575 module_put(owner);
576 }
577
Eric Dumazeteaefd112011-02-18 03:26:36 +0000578 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800579 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
Mikulas Patockab09e7862012-07-19 06:13:36 +0000581 if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
582 return;
583
Alex Shi19e8d692012-05-14 14:15:31 -0700584 this_cpu_sub(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 if (!sock->file) {
586 iput(SOCK_INODE(sock));
587 return;
588 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700589 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700591EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Willem de Bruijn67cc0d42014-09-08 19:58:58 -0400593void __sock_tx_timestamp(const struct sock *sk, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000594{
Eric Dumazet140c55d2014-08-06 11:49:29 +0200595 u8 flags = *tx_flags;
596
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400597 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200598 flags |= SKBTX_HW_TSTAMP;
599
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400600 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200601 flags |= SKBTX_SW_TSTAMP;
602
Willem de Bruijne7fd2882014-08-04 22:11:48 -0400603 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200604 flags |= SKBTX_SCHED_TSTAMP;
605
Willem de Bruijne1c8a602014-08-04 22:11:50 -0400606 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_ACK)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200607 flags |= SKBTX_ACK_TSTAMP;
Willem de Bruijne7fd2882014-08-04 22:11:48 -0400608
Eric Dumazet140c55d2014-08-06 11:49:29 +0200609 *tx_flags = flags;
Patrick Ohly20d49472009-02-12 05:03:38 +0000610}
Willem de Bruijn67cc0d42014-09-08 19:58:58 -0400611EXPORT_SYMBOL(__sock_tx_timestamp);
Patrick Ohly20d49472009-02-12 05:03:38 +0000612
Anton Blanchard228e5482011-05-02 20:21:35 +0000613static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
614 struct msghdr *msg, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615{
616 struct sock_iocb *si = kiocb_to_siocb(iocb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
618 si->sock = sock;
619 si->scm = NULL;
620 si->msg = msg;
621 si->size = size;
622
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 return sock->ops->sendmsg(iocb, sock, msg, size);
624}
625
Anton Blanchard228e5482011-05-02 20:21:35 +0000626static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
627 struct msghdr *msg, size_t size)
628{
629 int err = security_socket_sendmsg(sock, msg, size);
630
631 return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
632}
633
Gu Zheng0cf00c62014-12-05 15:14:23 +0800634static int do_sock_sendmsg(struct socket *sock, struct msghdr *msg,
635 size_t size, bool nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636{
637 struct kiocb iocb;
638 struct sock_iocb siocb;
639 int ret;
640
641 init_sync_kiocb(&iocb, NULL);
642 iocb.private = &siocb;
Gu Zheng0cf00c62014-12-05 15:14:23 +0800643 ret = nosec ? __sock_sendmsg_nosec(&iocb, sock, msg, size) :
644 __sock_sendmsg(&iocb, sock, msg, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 if (-EIOCBQUEUED == ret)
646 ret = wait_on_sync_kiocb(&iocb);
647 return ret;
648}
Gu Zheng0cf00c62014-12-05 15:14:23 +0800649
650int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
651{
652 return do_sock_sendmsg(sock, msg, size, false);
653}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700654EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
Eric Dumazet894dc242011-07-26 02:39:41 +0000656static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
Anton Blanchard228e5482011-05-02 20:21:35 +0000657{
Gu Zheng0cf00c62014-12-05 15:14:23 +0800658 return do_sock_sendmsg(sock, msg, size, true);
Anton Blanchard228e5482011-05-02 20:21:35 +0000659}
660
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
662 struct kvec *vec, size_t num, size_t size)
663{
664 mm_segment_t oldfs = get_fs();
665 int result;
666
667 set_fs(KERNEL_DS);
668 /*
669 * the following is safe, since for compiler definitions of kvec and
670 * iovec are identical, yielding the same in-core layout and alignment
671 */
Al Viroc0371da2014-11-24 10:42:55 -0500672 iov_iter_init(&msg->msg_iter, WRITE, (struct iovec *)vec, num, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 result = sock_sendmsg(sock, msg, size);
674 set_fs(oldfs);
675 return result;
676}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700677EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700679/*
680 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
681 */
682void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
683 struct sk_buff *skb)
684{
Patrick Ohly20d49472009-02-12 05:03:38 +0000685 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400686 struct scm_timestamping tss;
Patrick Ohly20d49472009-02-12 05:03:38 +0000687 int empty = 1;
688 struct skb_shared_hwtstamps *shhwtstamps =
689 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700690
Patrick Ohly20d49472009-02-12 05:03:38 +0000691 /* Race occurred between timestamp enabling and packet
692 receiving. Fill in the current time for now. */
693 if (need_software_tstamp && skb->tstamp.tv64 == 0)
694 __net_timestamp(skb);
695
696 if (need_software_tstamp) {
697 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
698 struct timeval tv;
699 skb_get_timestamp(skb, &tv);
700 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
701 sizeof(tv), &tv);
702 } else {
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400703 struct timespec ts;
704 skb_get_timestampns(skb, &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000705 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400706 sizeof(ts), &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000707 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700708 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000709
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400710 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400711 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400712 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000713 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400714 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400715 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400716 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2))
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400717 empty = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000718 if (!empty)
719 put_cmsg(msg, SOL_SOCKET,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400720 SCM_TIMESTAMPING, sizeof(tss), &tss);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700721}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300722EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
723
Johannes Berg6e3e9392011-11-09 10:15:42 +0100724void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
725 struct sk_buff *skb)
726{
727 int ack;
728
729 if (!sock_flag(sk, SOCK_WIFI_STATUS))
730 return;
731 if (!skb->wifi_acked_valid)
732 return;
733
734 ack = skb->wifi_acked;
735
736 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
737}
738EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
739
stephen hemminger11165f12010-10-18 14:27:29 +0000740static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
741 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700742{
743 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
744 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
745 sizeof(__u32), &skb->dropcount);
746}
747
Eric Dumazet767dd032010-04-28 19:14:43 +0000748void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700749 struct sk_buff *skb)
750{
751 sock_recv_timestamp(msg, sk, skb);
752 sock_recv_drops(msg, sk, skb);
753}
Eric Dumazet767dd032010-04-28 19:14:43 +0000754EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700755
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700756static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
757 struct msghdr *msg, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 struct sock_iocb *si = kiocb_to_siocb(iocb);
760
761 si->sock = sock;
762 si->scm = NULL;
763 si->msg = msg;
764 si->size = size;
765 si->flags = flags;
766
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
768}
769
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700770static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
771 struct msghdr *msg, size_t size, int flags)
772{
773 int err = security_socket_recvmsg(sock, msg, size, flags);
774
775 return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
776}
777
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700778int sock_recvmsg(struct socket *sock, struct msghdr *msg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 size_t size, int flags)
780{
781 struct kiocb iocb;
782 struct sock_iocb siocb;
783 int ret;
784
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700785 init_sync_kiocb(&iocb, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 iocb.private = &siocb;
787 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
788 if (-EIOCBQUEUED == ret)
789 ret = wait_on_sync_kiocb(&iocb);
790 return ret;
791}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700792EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700794static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
795 size_t size, int flags)
796{
797 struct kiocb iocb;
798 struct sock_iocb siocb;
799 int ret;
800
801 init_sync_kiocb(&iocb, NULL);
802 iocb.private = &siocb;
803 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
804 if (-EIOCBQUEUED == ret)
805 ret = wait_on_sync_kiocb(&iocb);
806 return ret;
807}
808
Martin Lucinac1249c02010-12-10 00:04:05 +0000809/**
810 * kernel_recvmsg - Receive a message from a socket (kernel space)
811 * @sock: The socket to receive the message from
812 * @msg: Received message
813 * @vec: Input s/g array for message data
814 * @num: Size of input s/g array
815 * @size: Number of bytes to read
816 * @flags: Message flags (MSG_DONTWAIT, etc...)
817 *
818 * On return the msg structure contains the scatter/gather array passed in the
819 * vec argument. The array is modified so that it consists of the unfilled
820 * portion of the original array.
821 *
822 * The returned value is the total number of bytes received, or an error.
823 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700824int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
825 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826{
827 mm_segment_t oldfs = get_fs();
828 int result;
829
830 set_fs(KERNEL_DS);
831 /*
832 * the following is safe, since for compiler definitions of kvec and
833 * iovec are identical, yielding the same in-core layout and alignment
834 */
Al Viroc0371da2014-11-24 10:42:55 -0500835 iov_iter_init(&msg->msg_iter, READ, (struct iovec *)vec, num, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 result = sock_recvmsg(sock, msg, size, flags);
837 set_fs(oldfs);
838 return result;
839}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700840EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300842static ssize_t sock_sendpage(struct file *file, struct page *page,
843 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844{
845 struct socket *sock;
846 int flags;
847
Eric Dumazetb69aee02005-09-06 14:42:45 -0700848 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
Eric Dumazet35f9c092012-04-05 03:05:35 +0000850 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
851 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
852 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
Linus Torvaldse6949582009-08-13 08:28:36 -0700854 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855}
856
Jens Axboe9c55e012007-11-06 23:30:13 -0800857static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700858 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800859 unsigned int flags)
860{
861 struct socket *sock = file->private_data;
862
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800863 if (unlikely(!sock->ops->splice_read))
864 return -EINVAL;
865
Jens Axboe9c55e012007-11-06 23:30:13 -0800866 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
867}
868
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800869static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700870 struct sock_iocb *siocb)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800871{
Kent Overstreetd29c4452013-03-18 11:09:26 -0700872 if (!is_sync_kiocb(iocb))
873 BUG();
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800874
875 siocb->kiocb = iocb;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800876 iocb->private = siocb;
877 return siocb;
878}
879
880static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700881 struct file *file, const struct iovec *iov,
882 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800883{
884 struct socket *sock = file->private_data;
Nicolas Dichtel7eb35b12015-01-15 10:35:58 +0100885 size_t size = iov_length(iov, nr_segs);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800886
887 msg->msg_name = NULL;
888 msg->msg_namelen = 0;
889 msg->msg_control = NULL;
890 msg->msg_controllen = 0;
Al Viroc0371da2014-11-24 10:42:55 -0500891 iov_iter_init(&msg->msg_iter, READ, iov, nr_segs, size);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800892 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
893
894 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
895}
896
Badari Pulavarty027445c2006-09-30 23:28:46 -0700897static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
898 unsigned long nr_segs, loff_t pos)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800899{
900 struct sock_iocb siocb, *x;
901
902 if (pos != 0)
903 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700904
Kent Overstreet73a70752013-05-09 15:03:42 -0700905 if (iocb->ki_nbytes == 0) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800906 return 0;
907
Badari Pulavarty027445c2006-09-30 23:28:46 -0700908
909 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800910 if (!x)
911 return -ENOMEM;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700912 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800913}
914
915static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -0700916 struct file *file, const struct iovec *iov,
917 unsigned long nr_segs)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800918{
919 struct socket *sock = file->private_data;
Nicolas Dichtel7eb35b12015-01-15 10:35:58 +0100920 size_t size = iov_length(iov, nr_segs);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800921
922 msg->msg_name = NULL;
923 msg->msg_namelen = 0;
924 msg->msg_control = NULL;
925 msg->msg_controllen = 0;
Al Viroc0371da2014-11-24 10:42:55 -0500926 iov_iter_init(&msg->msg_iter, WRITE, iov, nr_segs, size);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800927 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
928 if (sock->type == SOCK_SEQPACKET)
929 msg->msg_flags |= MSG_EOR;
930
931 return __sock_sendmsg(iocb, sock, msg, size);
932}
933
Badari Pulavarty027445c2006-09-30 23:28:46 -0700934static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
935 unsigned long nr_segs, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936{
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800937 struct sock_iocb siocb, *x;
938
939 if (pos != 0)
940 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700941
Badari Pulavarty027445c2006-09-30 23:28:46 -0700942 x = alloc_sock_iocb(iocb, &siocb);
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800943 if (!x)
944 return -ENOMEM;
945
Badari Pulavarty027445c2006-09-30 23:28:46 -0700946 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947}
948
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949/*
950 * Atomic setting of ioctl hooks to avoid race
951 * with module unload.
952 */
953
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800954static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700955static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956
Eric W. Biederman881d9662007-09-17 11:56:21 -0700957void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800959 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800961 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962}
963EXPORT_SYMBOL(brioctl_set);
964
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800965static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700966static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967
Eric W. Biederman881d9662007-09-17 11:56:21 -0700968void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800970 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800972 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973}
974EXPORT_SYMBOL(vlan_ioctl_set);
975
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800976static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700977static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700979void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800981 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800983 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984}
985EXPORT_SYMBOL(dlci_ioctl_set);
986
Arnd Bergmann6b960182009-11-06 23:10:54 -0800987static long sock_do_ioctl(struct net *net, struct socket *sock,
988 unsigned int cmd, unsigned long arg)
989{
990 int err;
991 void __user *argp = (void __user *)arg;
992
993 err = sock->ops->ioctl(sock, cmd, arg);
994
995 /*
996 * If this ioctl is unknown try to hand it down
997 * to the NIC driver.
998 */
999 if (err == -ENOIOCTLCMD)
1000 err = dev_ioctl(net, cmd, argp);
1001
1002 return err;
1003}
1004
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005/*
1006 * With an ioctl, arg may well be a user mode pointer, but we don't know
1007 * what to do with it - that's up to the protocol still.
1008 */
1009
1010static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1011{
1012 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001013 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 void __user *argp = (void __user *)arg;
1015 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001016 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017
Eric Dumazetb69aee02005-09-06 14:42:45 -07001018 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001019 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001020 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
Eric W. Biederman881d9662007-09-17 11:56:21 -07001022 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001024#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Eric W. Biederman881d9662007-09-17 11:56:21 -07001026 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001028#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001029 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 case FIOSETOWN:
1031 case SIOCSPGRP:
1032 err = -EFAULT;
1033 if (get_user(pid, (int __user *)argp))
1034 break;
Jeff Laytone0b93ed2014-08-22 11:27:32 -04001035 f_setown(sock->file, pid, 1);
1036 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 break;
1038 case FIOGETOWN:
1039 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001040 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001041 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 break;
1043 case SIOCGIFBR:
1044 case SIOCSIFBR:
1045 case SIOCBRADDBR:
1046 case SIOCBRDELBR:
1047 err = -ENOPKG;
1048 if (!br_ioctl_hook)
1049 request_module("bridge");
1050
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001051 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001052 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001053 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001054 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 break;
1056 case SIOCGIFVLAN:
1057 case SIOCSIFVLAN:
1058 err = -ENOPKG;
1059 if (!vlan_ioctl_hook)
1060 request_module("8021q");
1061
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001062 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001064 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001065 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 case SIOCADDDLCI:
1068 case SIOCDELDLCI:
1069 err = -ENOPKG;
1070 if (!dlci_ioctl_hook)
1071 request_module("dlci");
1072
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001073 mutex_lock(&dlci_ioctl_mutex);
1074 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001076 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 break;
1078 default:
Arnd Bergmann6b960182009-11-06 23:10:54 -08001079 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001081 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 return err;
1083}
1084
1085int sock_create_lite(int family, int type, int protocol, struct socket **res)
1086{
1087 int err;
1088 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001089
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 err = security_socket_create(family, type, protocol, 1);
1091 if (err)
1092 goto out;
1093
1094 sock = sock_alloc();
1095 if (!sock) {
1096 err = -ENOMEM;
1097 goto out;
1098 }
1099
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001101 err = security_socket_post_create(sock, family, type, protocol, 1);
1102 if (err)
1103 goto out_release;
1104
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105out:
1106 *res = sock;
1107 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001108out_release:
1109 sock_release(sock);
1110 sock = NULL;
1111 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001113EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114
1115/* No kernel lock held - perfect */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001116static unsigned int sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117{
Eliezer Tamircbf55002013-07-08 16:20:34 +03001118 unsigned int busy_flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 struct socket *sock;
1120
1121 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001122 * We can't return errors to poll, so it's either yes or no.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 */
Eric Dumazetb69aee02005-09-06 14:42:45 -07001124 sock = file->private_data;
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001125
Eliezer Tamircbf55002013-07-08 16:20:34 +03001126 if (sk_can_busy_loop(sock->sk)) {
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001127 /* this socket can poll_ll so tell the system call */
Eliezer Tamircbf55002013-07-08 16:20:34 +03001128 busy_flag = POLL_BUSY_LOOP;
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001129
1130 /* once, only if requested by syscall */
Eliezer Tamircbf55002013-07-08 16:20:34 +03001131 if (wait && (wait->_key & POLL_BUSY_LOOP))
1132 sk_busy_loop(sock->sk, 1);
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001133 }
1134
Eliezer Tamircbf55002013-07-08 16:20:34 +03001135 return busy_flag | sock->ops->poll(file, sock, wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136}
1137
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001138static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001140 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141
1142 return sock->ops->mmap(file, sock, vma);
1143}
1144
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001145static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 sock_release(SOCKET_I(inode));
1148 return 0;
1149}
1150
1151/*
1152 * Update the socket async list
1153 *
1154 * Fasync_list locking strategy.
1155 *
1156 * 1. fasync_list is modified only under process context socket lock
1157 * i.e. under semaphore.
1158 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001159 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 */
1161
1162static int sock_fasync(int fd, struct file *filp, int on)
1163{
Eric Dumazet989a2972010-04-14 09:55:35 +00001164 struct socket *sock = filp->private_data;
1165 struct sock *sk = sock->sk;
Eric Dumazeteaefd112011-02-18 03:26:36 +00001166 struct socket_wq *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
Eric Dumazet989a2972010-04-14 09:55:35 +00001168 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170
1171 lock_sock(sk);
Eric Dumazeteaefd112011-02-18 03:26:36 +00001172 wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
1173 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174
Eric Dumazeteaefd112011-02-18 03:26:36 +00001175 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001176 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001177 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001178 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179
Eric Dumazet989a2972010-04-14 09:55:35 +00001180 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 return 0;
1182}
1183
Eric Dumazet43815482010-04-29 11:01:49 +00001184/* This function may be called only under socket lock or callback_lock or rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185
1186int sock_wake_async(struct socket *sock, int how, int band)
1187{
Eric Dumazet43815482010-04-29 11:01:49 +00001188 struct socket_wq *wq;
1189
1190 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001192 rcu_read_lock();
1193 wq = rcu_dereference(sock->wq);
1194 if (!wq || !wq->fasync_list) {
1195 rcu_read_unlock();
1196 return -1;
1197 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001198 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001199 case SOCK_WAKE_WAITD:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1201 break;
1202 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001203 case SOCK_WAKE_SPACE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1205 break;
1206 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001207 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001208call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001209 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001211 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001212 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 }
Eric Dumazet43815482010-04-29 11:01:49 +00001214 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 return 0;
1216}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001217EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218
Pavel Emelyanov721db932010-09-29 16:06:32 +04001219int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001220 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221{
1222 int err;
1223 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001224 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225
1226 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001227 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 */
1229 if (family < 0 || family >= NPROTO)
1230 return -EAFNOSUPPORT;
1231 if (type < 0 || type >= SOCK_MAX)
1232 return -EINVAL;
1233
1234 /* Compatibility.
1235
1236 This uglymoron is moved from INET layer to here to avoid
1237 deadlock in module load.
1238 */
1239 if (family == PF_INET && type == SOCK_PACKET) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001240 static int warned;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 if (!warned) {
1242 warned = 1;
Yang Yingliang3410f222014-02-12 17:09:55 +08001243 pr_info("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1244 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 }
1246 family = PF_PACKET;
1247 }
1248
1249 err = security_socket_create(family, type, protocol, kern);
1250 if (err)
1251 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001252
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001253 /*
1254 * Allocate the socket and allow the family to set things up. if
1255 * the protocol is 0, the family is instructed to select an appropriate
1256 * default.
1257 */
1258 sock = sock_alloc();
1259 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001260 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001261 return -ENFILE; /* Not exactly a match, but its the
1262 closest posix thing */
1263 }
1264
1265 sock->type = type;
1266
Johannes Berg95a5afc2008-10-16 15:24:51 -07001267#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001268 /* Attempt to load a protocol module if the find failed.
1269 *
1270 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 * requested real, full-featured networking support upon configuration.
1272 * Otherwise module support will break!
1273 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001274 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001275 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276#endif
1277
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001278 rcu_read_lock();
1279 pf = rcu_dereference(net_families[family]);
1280 err = -EAFNOSUPPORT;
1281 if (!pf)
1282 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283
1284 /*
1285 * We will call the ->create function, that possibly is in a loadable
1286 * module, so we have to bump that loadable module refcnt first.
1287 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001288 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 goto out_release;
1290
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001291 /* Now protected by module ref count */
1292 rcu_read_unlock();
1293
Eric Paris3f378b62009-11-05 22:18:14 -08001294 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001295 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001297
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 /*
1299 * Now to bump the refcnt of the [loadable] module that owns this
1300 * socket at sock_release time we decrement its refcnt.
1301 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001302 if (!try_module_get(sock->ops->owner))
1303 goto out_module_busy;
1304
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 /*
1306 * Now that we're done with the ->create function, the [loadable]
1307 * module can have its refcnt decremented
1308 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001309 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001310 err = security_socket_post_create(sock, family, type, protocol, kern);
1311 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001312 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001313 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001315 return 0;
1316
1317out_module_busy:
1318 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001320 sock->ops = NULL;
1321 module_put(pf->owner);
1322out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001324 return err;
1325
1326out_release:
1327 rcu_read_unlock();
1328 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001330EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331
1332int sock_create(int family, int type, int protocol, struct socket **res)
1333{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001334 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001336EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337
1338int sock_create_kern(int family, int type, int protocol, struct socket **res)
1339{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001340 return __sock_create(&init_net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001342EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001344SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345{
1346 int retval;
1347 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001348 int flags;
1349
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001350 /* Check the SOCK_* constants for consistency. */
1351 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1352 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1353 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1354 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1355
Ulrich Dreppera677a032008-07-23 21:29:17 -07001356 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001357 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001358 return -EINVAL;
1359 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001361 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1362 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1363
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 retval = sock_create(family, type, protocol, &sock);
1365 if (retval < 0)
1366 goto out;
1367
Ulrich Drepper77d27202008-07-23 21:29:35 -07001368 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 if (retval < 0)
1370 goto out_release;
1371
1372out:
1373 /* It may be already another descriptor 8) Not kernel problem. */
1374 return retval;
1375
1376out_release:
1377 sock_release(sock);
1378 return retval;
1379}
1380
1381/*
1382 * Create a pair of connected sockets.
1383 */
1384
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001385SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1386 int __user *, usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387{
1388 struct socket *sock1, *sock2;
1389 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001390 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001391 int flags;
1392
1393 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001394 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001395 return -EINVAL;
1396 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001398 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1399 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1400
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 /*
1402 * Obtain the first socket and check if the underlying protocol
1403 * supports the socketpair call.
1404 */
1405
1406 err = sock_create(family, type, protocol, &sock1);
1407 if (err < 0)
1408 goto out;
1409
1410 err = sock_create(family, type, protocol, &sock2);
1411 if (err < 0)
1412 goto out_release_1;
1413
1414 err = sock1->ops->socketpair(sock1, sock2);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001415 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 goto out_release_both;
1417
Al Viro28407632012-08-17 23:54:15 -04001418 fd1 = get_unused_fd_flags(flags);
David S. Millerbf3c23d2007-10-29 21:54:02 -07001419 if (unlikely(fd1 < 0)) {
1420 err = fd1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421 goto out_release_both;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001422 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001423
Al Viro28407632012-08-17 23:54:15 -04001424 fd2 = get_unused_fd_flags(flags);
Al Viro198de4d2009-08-05 19:29:23 +04001425 if (unlikely(fd2 < 0)) {
1426 err = fd2;
Yann Droneaudd73aa282013-12-09 22:42:20 +01001427 goto out_put_unused_1;
Al Viro28407632012-08-17 23:54:15 -04001428 }
1429
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001430 newfile1 = sock_alloc_file(sock1, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001431 if (unlikely(IS_ERR(newfile1))) {
1432 err = PTR_ERR(newfile1);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001433 goto out_put_unused_both;
Al Viro28407632012-08-17 23:54:15 -04001434 }
1435
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001436 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001437 if (IS_ERR(newfile2)) {
1438 err = PTR_ERR(newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001439 goto out_fput_1;
Al Virodb349502007-02-07 01:48:00 -05001440 }
1441
Yann Droneaudd73aa282013-12-09 22:42:20 +01001442 err = put_user(fd1, &usockvec[0]);
1443 if (err)
1444 goto out_fput_both;
1445
1446 err = put_user(fd2, &usockvec[1]);
1447 if (err)
1448 goto out_fput_both;
1449
Al Viro157cf642008-12-14 04:57:47 -05001450 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001451
Al Virodb349502007-02-07 01:48:00 -05001452 fd_install(fd1, newfile1);
1453 fd_install(fd2, newfile2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 /* fd1 and fd2 may be already another descriptors.
1455 * Not kernel problem.
1456 */
1457
Yann Droneaudd73aa282013-12-09 22:42:20 +01001458 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459
Yann Droneaudd73aa282013-12-09 22:42:20 +01001460out_fput_both:
1461 fput(newfile2);
1462 fput(newfile1);
1463 put_unused_fd(fd2);
1464 put_unused_fd(fd1);
1465 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466
Yann Droneaudd73aa282013-12-09 22:42:20 +01001467out_fput_1:
1468 fput(newfile1);
1469 put_unused_fd(fd2);
1470 put_unused_fd(fd1);
1471 sock_release(sock2);
1472 goto out;
1473
1474out_put_unused_both:
1475 put_unused_fd(fd2);
1476out_put_unused_1:
1477 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478out_release_both:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001479 sock_release(sock2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480out_release_1:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001481 sock_release(sock1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482out:
1483 return err;
1484}
1485
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486/*
1487 * Bind a name to a socket. Nothing much to do here since it's
1488 * the protocol's responsibility to handle the local address.
1489 *
1490 * We move the socket address to kernel space before we call
1491 * the protocol layer (having also checked the address is ok).
1492 */
1493
Heiko Carstens20f37032009-01-14 14:14:23 +01001494SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495{
1496 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001497 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001498 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001500 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001501 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001502 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001503 if (err >= 0) {
1504 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001505 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001506 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001507 if (!err)
1508 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001509 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001510 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001512 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001513 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 return err;
1515}
1516
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517/*
1518 * Perform a listen. Basically, we allow the protocol to do anything
1519 * necessary for a listen, and if that works, we mark the socket as
1520 * ready for listening.
1521 */
1522
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001523SYSCALL_DEFINE2(listen, int, fd, int, backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524{
1525 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001526 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001527 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001528
1529 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1530 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001531 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001532 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001533 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534
1535 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001536 if (!err)
1537 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001539 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 }
1541 return err;
1542}
1543
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544/*
1545 * For accept, we attempt to create a new socket, set up the link
1546 * with the client, wake up the client, then return the new
1547 * connected fd. We collect the address of the connector in kernel
1548 * space and move it to user at the very end. This is unclean because
1549 * we open the socket then return an error.
1550 *
1551 * 1003.1g adds the ability to recvmsg() to query connection pending
1552 * status to recvmsg. We need to add that support in a way thats
1553 * clean when we restucture accept also.
1554 */
1555
Heiko Carstens20f37032009-01-14 14:14:23 +01001556SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1557 int __user *, upeer_addrlen, int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558{
1559 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001560 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001561 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001562 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563
Ulrich Drepper77d27202008-07-23 21:29:35 -07001564 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001565 return -EINVAL;
1566
1567 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1568 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1569
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001570 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571 if (!sock)
1572 goto out;
1573
1574 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001575 newsock = sock_alloc();
1576 if (!newsock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 goto out_put;
1578
1579 newsock->type = sock->type;
1580 newsock->ops = sock->ops;
1581
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 /*
1583 * We don't need try_module_get here, as the listening socket (sock)
1584 * has the protocol module (sock->ops->owner) held.
1585 */
1586 __module_get(newsock->ops->owner);
1587
Al Viro28407632012-08-17 23:54:15 -04001588 newfd = get_unused_fd_flags(flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001589 if (unlikely(newfd < 0)) {
1590 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001591 sock_release(newsock);
1592 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001593 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001594 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Al Viro28407632012-08-17 23:54:15 -04001595 if (unlikely(IS_ERR(newfile))) {
1596 err = PTR_ERR(newfile);
1597 put_unused_fd(newfd);
1598 sock_release(newsock);
1599 goto out_put;
1600 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001601
Frank Filza79af592005-09-27 15:23:38 -07001602 err = security_socket_accept(sock, newsock);
1603 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001604 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001605
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1607 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001608 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609
1610 if (upeer_sockaddr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001611 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001612 &len, 2) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001614 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001616 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001617 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001619 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 }
1621
1622 /* File flags are not inherited via accept() unlike another OSes. */
1623
David S. Miller39d8c1b2006-03-20 17:13:49 -08001624 fd_install(newfd, newfile);
1625 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001628 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629out:
1630 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001631out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001632 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001633 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 goto out_put;
1635}
1636
Heiko Carstens20f37032009-01-14 14:14:23 +01001637SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1638 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001639{
Ulrich Drepperde11def2008-11-19 15:36:14 -08001640 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001641}
1642
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643/*
1644 * Attempt to connect to a socket with the server address. The address
1645 * is in user space so we verify it is OK and move it to kernel space.
1646 *
1647 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1648 * break bindings
1649 *
1650 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1651 * other SEQPACKET protocols that take time to connect() as it doesn't
1652 * include the -EINPROGRESS status for such sockets.
1653 */
1654
Heiko Carstens20f37032009-01-14 14:14:23 +01001655SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1656 int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657{
1658 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001659 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001660 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001662 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663 if (!sock)
1664 goto out;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001665 err = move_addr_to_kernel(uservaddr, addrlen, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 if (err < 0)
1667 goto out_put;
1668
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001669 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001670 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 if (err)
1672 goto out_put;
1673
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001674 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 sock->file->f_flags);
1676out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001677 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678out:
1679 return err;
1680}
1681
1682/*
1683 * Get the local address ('name') of a socket object. Move the obtained
1684 * name to user space.
1685 */
1686
Heiko Carstens20f37032009-01-14 14:14:23 +01001687SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1688 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689{
1690 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001691 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001692 int len, err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001693
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001694 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695 if (!sock)
1696 goto out;
1697
1698 err = security_socket_getsockname(sock);
1699 if (err)
1700 goto out_put;
1701
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001702 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 if (err)
1704 goto out_put;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001705 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706
1707out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001708 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709out:
1710 return err;
1711}
1712
1713/*
1714 * Get the remote address ('name') of a socket object. Move the obtained
1715 * name to user space.
1716 */
1717
Heiko Carstens20f37032009-01-14 14:14:23 +01001718SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1719 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720{
1721 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001722 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001723 int len, err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001725 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1726 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 err = security_socket_getpeername(sock);
1728 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001729 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 return err;
1731 }
1732
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001733 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001734 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001735 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736 if (!err)
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001737 err = move_addr_to_user(&address, len, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001738 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001739 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 }
1741 return err;
1742}
1743
1744/*
1745 * Send a datagram to a given address. We move the address into kernel
1746 * space and check the user space data area is readable before invoking
1747 * the protocol.
1748 */
1749
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001750SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001751 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001752 int, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753{
1754 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001755 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756 int err;
1757 struct msghdr msg;
1758 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001759 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001760
Linus Torvalds253eacc2010-10-30 16:43:10 -07001761 if (len > INT_MAX)
1762 len = INT_MAX;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001763 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1764 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001765 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001766
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001767 iov.iov_base = buff;
1768 iov.iov_len = len;
1769 msg.msg_name = NULL;
Al Viroc0371da2014-11-24 10:42:55 -05001770 iov_iter_init(&msg.msg_iter, WRITE, &iov, 1, len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001771 msg.msg_control = NULL;
1772 msg.msg_controllen = 0;
1773 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001774 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001775 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776 if (err < 0)
1777 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001778 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001779 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780 }
1781 if (sock->file->f_flags & O_NONBLOCK)
1782 flags |= MSG_DONTWAIT;
1783 msg.msg_flags = flags;
1784 err = sock_sendmsg(sock, &msg, len);
1785
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001786out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001787 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001788out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 return err;
1790}
1791
1792/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001793 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794 */
1795
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001796SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001797 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798{
1799 return sys_sendto(fd, buff, len, flags, NULL, 0);
1800}
1801
1802/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001803 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 * sender. We verify the buffers are writable and if needed move the
1805 * sender address from kernel to user space.
1806 */
1807
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001808SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
Eric Dumazet95c96172012-04-15 05:58:06 +00001809 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001810 int __user *, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811{
1812 struct socket *sock;
1813 struct iovec iov;
1814 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001815 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001816 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001817 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818
Linus Torvalds253eacc2010-10-30 16:43:10 -07001819 if (size > INT_MAX)
1820 size = INT_MAX;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001821 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001823 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001825 msg.msg_control = NULL;
1826 msg.msg_controllen = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001827 iov.iov_len = size;
1828 iov.iov_base = ubuf;
Al Viroc0371da2014-11-24 10:42:55 -05001829 iov_iter_init(&msg.msg_iter, READ, &iov, 1, size);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01001830 /* Save some cycles and don't copy the address if not needed */
1831 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1832 /* We assume all kernel code knows the size of sockaddr_storage */
1833 msg.msg_namelen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834 if (sock->file->f_flags & O_NONBLOCK)
1835 flags |= MSG_DONTWAIT;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001836 err = sock_recvmsg(sock, &msg, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001838 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001839 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001840 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001841 if (err2 < 0)
1842 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001844
1845 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001846out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 return err;
1848}
1849
1850/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001851 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852 */
1853
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02001854SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1855 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856{
1857 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1858}
1859
1860/*
1861 * Set a socket option. Because we don't know the option lengths we have
1862 * to pass the user mode parameter for the protocols to sort out.
1863 */
1864
Heiko Carstens20f37032009-01-14 14:14:23 +01001865SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1866 char __user *, optval, int, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001868 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 struct socket *sock;
1870
1871 if (optlen < 0)
1872 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001873
1874 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1875 if (sock != NULL) {
1876 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001877 if (err)
1878 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879
1880 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001881 err =
1882 sock_setsockopt(sock, level, optname, optval,
1883 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001885 err =
1886 sock->ops->setsockopt(sock, level, optname, optval,
1887 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001888out_put:
1889 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 }
1891 return err;
1892}
1893
1894/*
1895 * Get a socket option. Because we don't know the option lengths we have
1896 * to pass a user mode parameter for the protocols to sort out.
1897 */
1898
Heiko Carstens20f37032009-01-14 14:14:23 +01001899SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1900 char __user *, optval, int __user *, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001902 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001903 struct socket *sock;
1904
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001905 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1906 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001907 err = security_socket_getsockopt(sock, level, optname);
1908 if (err)
1909 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910
1911 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001912 err =
1913 sock_getsockopt(sock, level, optname, optval,
1914 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001916 err =
1917 sock->ops->getsockopt(sock, level, optname, optval,
1918 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001919out_put:
1920 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921 }
1922 return err;
1923}
1924
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925/*
1926 * Shutdown a socket.
1927 */
1928
Heiko Carstens754fe8d2009-01-14 14:14:09 +01001929SYSCALL_DEFINE2(shutdown, int, fd, int, how)
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) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001937 if (!err)
1938 err = sock->ops->shutdown(sock, how);
1939 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940 }
1941 return err;
1942}
1943
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001944/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945 * fields which are the same type (int / unsigned) on our platforms.
1946 */
1947#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1948#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1949#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1950
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001951struct used_address {
1952 struct sockaddr_storage name;
1953 unsigned int name_len;
1954};
1955
Al Viro08adb7d2014-11-10 20:23:13 -05001956static ssize_t copy_msghdr_from_user(struct msghdr *kmsg,
1957 struct user_msghdr __user *umsg,
1958 struct sockaddr __user **save_addr,
1959 struct iovec **iov)
Dan Carpenter1661bf32013-10-03 00:27:20 +03001960{
Al Viro08adb7d2014-11-10 20:23:13 -05001961 struct sockaddr __user *uaddr;
1962 struct iovec __user *uiov;
Al Viroc0371da2014-11-24 10:42:55 -05001963 size_t nr_segs;
Al Viro08adb7d2014-11-10 20:23:13 -05001964 ssize_t err;
1965
1966 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
1967 __get_user(uaddr, &umsg->msg_name) ||
1968 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
1969 __get_user(uiov, &umsg->msg_iov) ||
Al Viroc0371da2014-11-24 10:42:55 -05001970 __get_user(nr_segs, &umsg->msg_iovlen) ||
Al Viro08adb7d2014-11-10 20:23:13 -05001971 __get_user(kmsg->msg_control, &umsg->msg_control) ||
1972 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
1973 __get_user(kmsg->msg_flags, &umsg->msg_flags))
Dan Carpenter1661bf32013-10-03 00:27:20 +03001974 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00001975
Al Viro08adb7d2014-11-10 20:23:13 -05001976 if (!uaddr)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07001977 kmsg->msg_namelen = 0;
1978
Matthew Leachdbb490b2014-03-11 11:58:27 +00001979 if (kmsg->msg_namelen < 0)
1980 return -EINVAL;
1981
Dan Carpenter1661bf32013-10-03 00:27:20 +03001982 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03001983 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05001984
1985 if (save_addr)
1986 *save_addr = uaddr;
1987
1988 if (uaddr && kmsg->msg_namelen) {
1989 if (!save_addr) {
1990 err = move_addr_to_kernel(uaddr, kmsg->msg_namelen,
1991 kmsg->msg_name);
1992 if (err < 0)
1993 return err;
1994 }
1995 } else {
1996 kmsg->msg_name = NULL;
1997 kmsg->msg_namelen = 0;
1998 }
1999
Al Viroc0371da2014-11-24 10:42:55 -05002000 if (nr_segs > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05002001 return -EMSGSIZE;
2002
2003 err = rw_copy_check_uvector(save_addr ? READ : WRITE,
Al Viroc0371da2014-11-24 10:42:55 -05002004 uiov, nr_segs,
Al Viro08adb7d2014-11-10 20:23:13 -05002005 UIO_FASTIOV, *iov, iov);
2006 if (err >= 0)
Al Viroc0371da2014-11-24 10:42:55 -05002007 iov_iter_init(&kmsg->msg_iter, save_addr ? READ : WRITE,
2008 *iov, nr_segs, err);
Al Viro08adb7d2014-11-10 20:23:13 -05002009 return err;
Dan Carpenter1661bf32013-10-03 00:27:20 +03002010}
2011
Al Viro666547f2014-04-06 14:03:05 -04002012static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002013 struct msghdr *msg_sys, unsigned int flags,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002014 struct used_address *used_address)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002015{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002016 struct compat_msghdr __user *msg_compat =
2017 (struct compat_msghdr __user *)msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002018 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002019 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07002020 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002021 __attribute__ ((aligned(sizeof(__kernel_size_t))));
2022 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023 unsigned char *ctl_buf = ctl;
Al Viro08adb7d2014-11-10 20:23:13 -05002024 int ctl_len, total_len;
2025 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002026
Al Viro08adb7d2014-11-10 20:23:13 -05002027 msg_sys->msg_name = &address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028
Al Viro08449322014-11-09 22:33:45 -05002029 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002030 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
Al Viro08449322014-11-09 22:33:45 -05002031 else
Al Viro08adb7d2014-11-10 20:23:13 -05002032 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002033 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034 goto out_freeiov;
2035 total_len = err;
2036
2037 err = -ENOBUFS;
2038
Anton Blanchard228e5482011-05-02 20:21:35 +00002039 if (msg_sys->msg_controllen > INT_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00002041 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002043 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00002044 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002045 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002046 if (err)
2047 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00002048 ctl_buf = msg_sys->msg_control;
2049 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002050 } else if (ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002051 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002053 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002054 goto out_freeiov;
2055 }
2056 err = -EFAULT;
2057 /*
Anton Blanchard228e5482011-05-02 20:21:35 +00002058 * Careful! Before this, msg_sys->msg_control contains a user pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2060 * checking falls down on this.
2061 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00002062 if (copy_from_user(ctl_buf,
Anton Blanchard228e5482011-05-02 20:21:35 +00002063 (void __user __force *)msg_sys->msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002064 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002065 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00002066 msg_sys->msg_control = ctl_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 }
Anton Blanchard228e5482011-05-02 20:21:35 +00002068 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069
2070 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00002071 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002072 /*
2073 * If this is sendmmsg() and current destination address is same as
2074 * previously succeeded address, omit asking LSM's decision.
2075 * used_address->name_len is initialized to UINT_MAX so that the first
2076 * destination address never matches.
2077 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002078 if (used_address && msg_sys->msg_name &&
2079 used_address->name_len == msg_sys->msg_namelen &&
2080 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002081 used_address->name_len)) {
2082 err = sock_sendmsg_nosec(sock, msg_sys, total_len);
2083 goto out_freectl;
2084 }
2085 err = sock_sendmsg(sock, msg_sys, total_len);
2086 /*
2087 * If this is sendmmsg() and sending to current destination address was
2088 * successful, remember it.
2089 */
2090 if (used_address && err >= 0) {
2091 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002092 if (msg_sys->msg_name)
2093 memcpy(&used_address->name, msg_sys->msg_name,
2094 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002095 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096
2097out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002098 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2100out_freeiov:
2101 if (iov != iovstack)
Eric Dumazeta74e9102012-04-20 20:04:01 +02002102 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00002103 return err;
2104}
2105
2106/*
2107 * BSD sendmsg interface
2108 */
2109
Al Viro666547f2014-04-06 14:03:05 -04002110long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
Anton Blanchard228e5482011-05-02 20:21:35 +00002111{
2112 int fput_needed, err;
2113 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002114 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00002115
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002116 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00002117 if (!sock)
2118 goto out;
2119
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002120 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
Anton Blanchard228e5482011-05-02 20:21:35 +00002121
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002122 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002123out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124 return err;
2125}
2126
Al Viro666547f2014-04-06 14:03:05 -04002127SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002128{
2129 if (flags & MSG_CMSG_COMPAT)
2130 return -EINVAL;
2131 return __sys_sendmsg(fd, msg, flags);
2132}
2133
Anton Blanchard228e5482011-05-02 20:21:35 +00002134/*
2135 * Linux sendmmsg interface
2136 */
2137
2138int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2139 unsigned int flags)
2140{
2141 int fput_needed, err, datagrams;
2142 struct socket *sock;
2143 struct mmsghdr __user *entry;
2144 struct compat_mmsghdr __user *compat_entry;
2145 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002146 struct used_address used_address;
Anton Blanchard228e5482011-05-02 20:21:35 +00002147
Anton Blanchard98382f42011-08-04 14:07:39 +00002148 if (vlen > UIO_MAXIOV)
2149 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002150
2151 datagrams = 0;
2152
2153 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2154 if (!sock)
2155 return err;
2156
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002157 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002158 entry = mmsg;
2159 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002160 err = 0;
Anton Blanchard228e5482011-05-02 20:21:35 +00002161
2162 while (datagrams < vlen) {
Anton Blanchard228e5482011-05-02 20:21:35 +00002163 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002164 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002165 &msg_sys, flags, &used_address);
Anton Blanchard228e5482011-05-02 20:21:35 +00002166 if (err < 0)
2167 break;
2168 err = __put_user(err, &compat_entry->msg_len);
2169 ++compat_entry;
2170 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002171 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002172 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002173 &msg_sys, flags, &used_address);
Anton Blanchard228e5482011-05-02 20:21:35 +00002174 if (err < 0)
2175 break;
2176 err = put_user(err, &entry->msg_len);
2177 ++entry;
2178 }
2179
2180 if (err)
2181 break;
2182 ++datagrams;
2183 }
2184
Anton Blanchard228e5482011-05-02 20:21:35 +00002185 fput_light(sock->file, fput_needed);
2186
Anton Blanchard728ffb82011-08-04 14:07:38 +00002187 /* We only return an error if no datagrams were able to be sent */
2188 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002189 return datagrams;
2190
Anton Blanchard228e5482011-05-02 20:21:35 +00002191 return err;
2192}
2193
2194SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2195 unsigned int, vlen, unsigned int, flags)
2196{
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002197 if (flags & MSG_CMSG_COMPAT)
2198 return -EINVAL;
Anton Blanchard228e5482011-05-02 20:21:35 +00002199 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2200}
2201
Al Viro666547f2014-04-06 14:03:05 -04002202static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002203 struct msghdr *msg_sys, unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002204{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002205 struct compat_msghdr __user *msg_compat =
2206 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002207 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002208 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209 unsigned long cmsg_ptr;
Al Viro08adb7d2014-11-10 20:23:13 -05002210 int total_len, len;
2211 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002212
2213 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002214 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002215
2216 /* user mode address pointers */
2217 struct sockaddr __user *uaddr;
Al Viro08adb7d2014-11-10 20:23:13 -05002218 int __user *uaddr_len = COMPAT_NAMELEN(msg);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002219
Al Viro08adb7d2014-11-10 20:23:13 -05002220 msg_sys->msg_name = &addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002222 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002223 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002224 else
Al Viro08adb7d2014-11-10 20:23:13 -05002225 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002226 if (err < 0)
2227 goto out_freeiov;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002228 total_len = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002230 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2231 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002232
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002233 /* We assume all kernel code knows the size of sockaddr_storage */
2234 msg_sys->msg_namelen = 0;
2235
Linus Torvalds1da177e2005-04-16 15:20:36 -07002236 if (sock->file->f_flags & O_NONBLOCK)
2237 flags |= MSG_DONTWAIT;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002238 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
2239 total_len, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240 if (err < 0)
2241 goto out_freeiov;
2242 len = err;
2243
2244 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002245 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002246 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002247 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248 if (err < 0)
2249 goto out_freeiov;
2250 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002251 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002252 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002253 if (err)
2254 goto out_freeiov;
2255 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002256 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002257 &msg_compat->msg_controllen);
2258 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002259 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260 &msg->msg_controllen);
2261 if (err)
2262 goto out_freeiov;
2263 err = len;
2264
2265out_freeiov:
2266 if (iov != iovstack)
Eric Dumazeta74e9102012-04-20 20:04:01 +02002267 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002268 return err;
2269}
2270
2271/*
2272 * BSD recvmsg interface
2273 */
2274
Al Viro666547f2014-04-06 14:03:05 -04002275long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002276{
2277 int fput_needed, err;
2278 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002279 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002280
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002281 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002282 if (!sock)
2283 goto out;
2284
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002285 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002286
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002287 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002288out:
2289 return err;
2290}
2291
Al Viro666547f2014-04-06 14:03:05 -04002292SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002293 unsigned int, flags)
2294{
2295 if (flags & MSG_CMSG_COMPAT)
2296 return -EINVAL;
2297 return __sys_recvmsg(fd, msg, flags);
2298}
2299
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002300/*
2301 * Linux recvmmsg interface
2302 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002304int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2305 unsigned int flags, struct timespec *timeout)
2306{
2307 int fput_needed, err, datagrams;
2308 struct socket *sock;
2309 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002310 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002311 struct msghdr msg_sys;
2312 struct timespec end_time;
2313
2314 if (timeout &&
2315 poll_select_set_timeout(&end_time, timeout->tv_sec,
2316 timeout->tv_nsec))
2317 return -EINVAL;
2318
2319 datagrams = 0;
2320
2321 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2322 if (!sock)
2323 return err;
2324
2325 err = sock_error(sock->sk);
2326 if (err)
2327 goto out_put;
2328
2329 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002330 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002331
2332 while (datagrams < vlen) {
2333 /*
2334 * No need to ask LSM for more than the first datagram.
2335 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002336 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002337 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002338 &msg_sys, flags & ~MSG_WAITFORONE,
2339 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002340 if (err < 0)
2341 break;
2342 err = __put_user(err, &compat_entry->msg_len);
2343 ++compat_entry;
2344 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002345 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002346 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002347 &msg_sys, flags & ~MSG_WAITFORONE,
2348 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002349 if (err < 0)
2350 break;
2351 err = put_user(err, &entry->msg_len);
2352 ++entry;
2353 }
2354
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002355 if (err)
2356 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002357 ++datagrams;
2358
Brandon L Black71c5c152010-03-26 16:18:03 +00002359 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2360 if (flags & MSG_WAITFORONE)
2361 flags |= MSG_DONTWAIT;
2362
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002363 if (timeout) {
2364 ktime_get_ts(timeout);
2365 *timeout = timespec_sub(end_time, *timeout);
2366 if (timeout->tv_sec < 0) {
2367 timeout->tv_sec = timeout->tv_nsec = 0;
2368 break;
2369 }
2370
2371 /* Timeout, return less than vlen datagrams */
2372 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2373 break;
2374 }
2375
2376 /* Out of band data, return right away */
2377 if (msg_sys.msg_flags & MSG_OOB)
2378 break;
2379 }
2380
2381out_put:
2382 fput_light(sock->file, fput_needed);
2383
2384 if (err == 0)
2385 return datagrams;
2386
2387 if (datagrams != 0) {
2388 /*
2389 * We may return less entries than requested (vlen) if the
2390 * sock is non block and there aren't enough datagrams...
2391 */
2392 if (err != -EAGAIN) {
2393 /*
2394 * ... or if recvmsg returns an error after we
2395 * received some datagrams, where we record the
2396 * error to return on the next call or if the
2397 * app asks about it using getsockopt(SO_ERROR).
2398 */
2399 sock->sk->sk_err = -err;
2400 }
2401
2402 return datagrams;
2403 }
2404
2405 return err;
2406}
2407
2408SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2409 unsigned int, vlen, unsigned int, flags,
2410 struct timespec __user *, timeout)
2411{
2412 int datagrams;
2413 struct timespec timeout_sys;
2414
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002415 if (flags & MSG_CMSG_COMPAT)
2416 return -EINVAL;
2417
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002418 if (!timeout)
2419 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2420
2421 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2422 return -EFAULT;
2423
2424 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2425
2426 if (datagrams > 0 &&
2427 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2428 datagrams = -EFAULT;
2429
2430 return datagrams;
2431}
2432
2433#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002434/* Argument list sizes for sys_socketcall */
2435#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002436static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002437 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2438 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2439 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002440 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002441};
2442
Linus Torvalds1da177e2005-04-16 15:20:36 -07002443#undef AL
2444
2445/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002446 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002447 *
2448 * Argument checking cleaned up. Saved 20% in size.
2449 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002450 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002451 */
2452
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002453SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002454{
Chen Gang2950fa92013-04-07 16:55:23 +08002455 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002456 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002457 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002458 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002459
Anton Blanchard228e5482011-05-02 20:21:35 +00002460 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002461 return -EINVAL;
2462
Arjan van de Ven47379052009-09-28 12:57:44 -07002463 len = nargs[call];
2464 if (len > sizeof(a))
2465 return -EINVAL;
2466
Linus Torvalds1da177e2005-04-16 15:20:36 -07002467 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002468 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002469 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002470
Chen Gang2950fa92013-04-07 16:55:23 +08002471 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2472 if (err)
2473 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002474
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002475 a0 = a[0];
2476 a1 = a[1];
2477
2478 switch (call) {
2479 case SYS_SOCKET:
2480 err = sys_socket(a0, a1, a[2]);
2481 break;
2482 case SYS_BIND:
2483 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2484 break;
2485 case SYS_CONNECT:
2486 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2487 break;
2488 case SYS_LISTEN:
2489 err = sys_listen(a0, a1);
2490 break;
2491 case SYS_ACCEPT:
Ulrich Drepperde11def2008-11-19 15:36:14 -08002492 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2493 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002494 break;
2495 case SYS_GETSOCKNAME:
2496 err =
2497 sys_getsockname(a0, (struct sockaddr __user *)a1,
2498 (int __user *)a[2]);
2499 break;
2500 case SYS_GETPEERNAME:
2501 err =
2502 sys_getpeername(a0, (struct sockaddr __user *)a1,
2503 (int __user *)a[2]);
2504 break;
2505 case SYS_SOCKETPAIR:
2506 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2507 break;
2508 case SYS_SEND:
2509 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2510 break;
2511 case SYS_SENDTO:
2512 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2513 (struct sockaddr __user *)a[4], a[5]);
2514 break;
2515 case SYS_RECV:
2516 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2517 break;
2518 case SYS_RECVFROM:
2519 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2520 (struct sockaddr __user *)a[4],
2521 (int __user *)a[5]);
2522 break;
2523 case SYS_SHUTDOWN:
2524 err = sys_shutdown(a0, a1);
2525 break;
2526 case SYS_SETSOCKOPT:
2527 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2528 break;
2529 case SYS_GETSOCKOPT:
2530 err =
2531 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2532 (int __user *)a[4]);
2533 break;
2534 case SYS_SENDMSG:
Al Viro666547f2014-04-06 14:03:05 -04002535 err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002536 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002537 case SYS_SENDMMSG:
2538 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2539 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002540 case SYS_RECVMSG:
Al Viro666547f2014-04-06 14:03:05 -04002541 err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002542 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002543 case SYS_RECVMMSG:
2544 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2545 (struct timespec __user *)a[4]);
2546 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002547 case SYS_ACCEPT4:
2548 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2549 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002550 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002551 default:
2552 err = -EINVAL;
2553 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002554 }
2555 return err;
2556}
2557
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002558#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002559
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002560/**
2561 * sock_register - add a socket protocol handler
2562 * @ops: description of protocol
2563 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002564 * This function is called by a protocol handler that wants to
2565 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09002566 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002567 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002568 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002569int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002570{
2571 int err;
2572
2573 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08002574 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002575 return -ENOBUFS;
2576 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002577
2578 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002579 if (rcu_dereference_protected(net_families[ops->family],
2580 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002581 err = -EEXIST;
2582 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00002583 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002584 err = 0;
2585 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002586 spin_unlock(&net_family_lock);
2587
Yang Yingliang3410f222014-02-12 17:09:55 +08002588 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002589 return err;
2590}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002591EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002592
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002593/**
2594 * sock_unregister - remove a protocol handler
2595 * @family: protocol family to remove
2596 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002597 * This function is called by a protocol handler that wants to
2598 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002599 * new socket creation.
2600 *
2601 * If protocol handler is a module, then it can use module reference
2602 * counts to protect against new references. If protocol handler is not
2603 * a module then it needs to provide its own protection in
2604 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002605 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002606void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002607{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002608 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002609
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002610 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00002611 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002612 spin_unlock(&net_family_lock);
2613
2614 synchronize_rcu();
2615
Yang Yingliang3410f222014-02-12 17:09:55 +08002616 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002617}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002618EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002619
Andi Kleen77d76ea2005-12-22 12:43:42 -08002620static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002621{
Nick Pigginb3e19d92011-01-07 17:50:11 +11002622 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00002623 /*
2624 * Initialize the network sysctl infrastructure.
2625 */
2626 err = net_sysctl_init();
2627 if (err)
2628 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11002629
Linus Torvalds1da177e2005-04-16 15:20:36 -07002630 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002631 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002632 */
2633 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002634
2635 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002636 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002637 */
2638
2639 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11002640
2641 err = register_filesystem(&sock_fs_type);
2642 if (err)
2643 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002644 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11002645 if (IS_ERR(sock_mnt)) {
2646 err = PTR_ERR(sock_mnt);
2647 goto out_mount;
2648 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08002649
2650 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651 */
2652
2653#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00002654 err = netfilter_init();
2655 if (err)
2656 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002657#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002658
Daniel Borkmann408eccc2014-04-01 16:20:23 +02002659 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00002660
Nick Pigginb3e19d92011-01-07 17:50:11 +11002661out:
2662 return err;
2663
2664out_mount:
2665 unregister_filesystem(&sock_fs_type);
2666out_fs:
2667 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002668}
2669
Andi Kleen77d76ea2005-12-22 12:43:42 -08002670core_initcall(sock_init); /* early initcall */
2671
Linus Torvalds1da177e2005-04-16 15:20:36 -07002672#ifdef CONFIG_PROC_FS
2673void socket_seq_show(struct seq_file *seq)
2674{
2675 int cpu;
2676 int counter = 0;
2677
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07002678 for_each_possible_cpu(cpu)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002679 counter += per_cpu(sockets_in_use, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002680
2681 /* It can be negative, by the way. 8) */
2682 if (counter < 0)
2683 counter = 0;
2684
2685 seq_printf(seq, "sockets: used %d\n", counter);
2686}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002687#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002688
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002689#ifdef CONFIG_COMPAT
Arnd Bergmann6b960182009-11-06 23:10:54 -08002690static int do_siocgstamp(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002691 unsigned int cmd, void __user *up)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002692{
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002693 mm_segment_t old_fs = get_fs();
2694 struct timeval ktv;
2695 int err;
2696
2697 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002698 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002699 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002700 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002701 err = compat_put_timeval(&ktv, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002702
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002703 return err;
2704}
2705
Arnd Bergmann6b960182009-11-06 23:10:54 -08002706static int do_siocgstampns(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002707 unsigned int cmd, void __user *up)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002708{
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002709 mm_segment_t old_fs = get_fs();
2710 struct timespec kts;
2711 int err;
2712
2713 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002714 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002715 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002716 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002717 err = compat_put_timespec(&kts, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002718
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002719 return err;
2720}
2721
Arnd Bergmann6b960182009-11-06 23:10:54 -08002722static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002723{
2724 struct ifreq __user *uifr;
2725 int err;
2726
2727 uifr = compat_alloc_user_space(sizeof(struct ifreq));
Arnd Bergmann6b960182009-11-06 23:10:54 -08002728 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002729 return -EFAULT;
2730
Arnd Bergmann6b960182009-11-06 23:10:54 -08002731 err = dev_ioctl(net, SIOCGIFNAME, uifr);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002732 if (err)
2733 return err;
2734
Arnd Bergmann6b960182009-11-06 23:10:54 -08002735 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002736 return -EFAULT;
2737
2738 return 0;
2739}
2740
Arnd Bergmann6b960182009-11-06 23:10:54 -08002741static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002742{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002743 struct compat_ifconf ifc32;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002744 struct ifconf ifc;
2745 struct ifconf __user *uifc;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002746 struct compat_ifreq __user *ifr32;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002747 struct ifreq __user *ifr;
2748 unsigned int i, j;
2749 int err;
2750
Arnd Bergmann6b960182009-11-06 23:10:54 -08002751 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002752 return -EFAULT;
2753
Mathias Krause43da5f22012-08-15 11:31:57 +00002754 memset(&ifc, 0, sizeof(ifc));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002755 if (ifc32.ifcbuf == 0) {
2756 ifc32.ifc_len = 0;
2757 ifc.ifc_len = 0;
2758 ifc.ifc_req = NULL;
2759 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2760 } else {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002761 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2762 sizeof(struct ifreq);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002763 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2764 ifc.ifc_len = len;
2765 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2766 ifr32 = compat_ptr(ifc32.ifcbuf);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002767 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
Arnd Bergmann6b960182009-11-06 23:10:54 -08002768 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002769 return -EFAULT;
2770 ifr++;
2771 ifr32++;
2772 }
2773 }
2774 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2775 return -EFAULT;
2776
Arnd Bergmann6b960182009-11-06 23:10:54 -08002777 err = dev_ioctl(net, SIOCGIFCONF, uifc);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002778 if (err)
2779 return err;
2780
2781 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2782 return -EFAULT;
2783
2784 ifr = ifc.ifc_req;
2785 ifr32 = compat_ptr(ifc32.ifcbuf);
2786 for (i = 0, j = 0;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002787 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2788 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2789 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002790 return -EFAULT;
2791 ifr32++;
2792 ifr++;
2793 }
2794
2795 if (ifc32.ifcbuf == 0) {
2796 /* Translate from 64-bit structure multiple to
2797 * a 32-bit one.
2798 */
2799 i = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002800 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002801 ifc32.ifc_len = i;
2802 } else {
2803 ifc32.ifc_len = i;
2804 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08002805 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002806 return -EFAULT;
2807
2808 return 0;
2809}
2810
Arnd Bergmann6b960182009-11-06 23:10:54 -08002811static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002812{
Ben Hutchings3a7da392011-03-17 07:34:32 +00002813 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2814 bool convert_in = false, convert_out = false;
2815 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2816 struct ethtool_rxnfc __user *rxnfc;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002817 struct ifreq __user *ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002818 u32 rule_cnt = 0, actual_rule_cnt;
2819 u32 ethcmd;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002820 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002821 int ret;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002822
2823 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2824 return -EFAULT;
2825
Ben Hutchings3a7da392011-03-17 07:34:32 +00002826 compat_rxnfc = compat_ptr(data);
2827
2828 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002829 return -EFAULT;
2830
Ben Hutchings3a7da392011-03-17 07:34:32 +00002831 /* Most ethtool structures are defined without padding.
2832 * Unfortunately struct ethtool_rxnfc is an exception.
2833 */
2834 switch (ethcmd) {
2835 default:
2836 break;
2837 case ETHTOOL_GRXCLSRLALL:
2838 /* Buffer size is variable */
2839 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2840 return -EFAULT;
2841 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2842 return -ENOMEM;
2843 buf_size += rule_cnt * sizeof(u32);
2844 /* fall through */
2845 case ETHTOOL_GRXRINGS:
2846 case ETHTOOL_GRXCLSRLCNT:
2847 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00002848 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002849 convert_out = true;
2850 /* fall through */
2851 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002852 buf_size += sizeof(struct ethtool_rxnfc);
2853 convert_in = true;
2854 break;
2855 }
2856
2857 ifr = compat_alloc_user_space(buf_size);
Stephen Hemminger954b1242013-02-11 06:22:28 +00002858 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
Ben Hutchings3a7da392011-03-17 07:34:32 +00002859
2860 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2861 return -EFAULT;
2862
2863 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2864 &ifr->ifr_ifru.ifru_data))
2865 return -EFAULT;
2866
2867 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00002868 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00002869 * fs.ring_cookie and at the end of fs, but nowhere else.
2870 */
Alexander Duyck127fe532011-04-08 18:01:59 +00002871 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2872 sizeof(compat_rxnfc->fs.m_ext) !=
2873 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2874 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00002875 BUILD_BUG_ON(
2876 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2877 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2878 offsetof(struct ethtool_rxnfc, fs.location) -
2879 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2880
2881 if (copy_in_user(rxnfc, compat_rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002882 (void __user *)(&rxnfc->fs.m_ext + 1) -
2883 (void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002884 copy_in_user(&rxnfc->fs.ring_cookie,
2885 &compat_rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002886 (void __user *)(&rxnfc->fs.location + 1) -
2887 (void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002888 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2889 sizeof(rxnfc->rule_cnt)))
2890 return -EFAULT;
2891 }
2892
2893 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2894 if (ret)
2895 return ret;
2896
2897 if (convert_out) {
2898 if (copy_in_user(compat_rxnfc, rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002899 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2900 (const void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002901 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2902 &rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002903 (const void __user *)(&rxnfc->fs.location + 1) -
2904 (const void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002905 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2906 sizeof(rxnfc->rule_cnt)))
2907 return -EFAULT;
2908
2909 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2910 /* As an optimisation, we only copy the actual
2911 * number of rules that the underlying
2912 * function returned. Since Mallory might
2913 * change the rule count in user memory, we
2914 * check that it is less than the rule count
2915 * originally given (as the user buffer size),
2916 * which has been range-checked.
2917 */
2918 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2919 return -EFAULT;
2920 if (actual_rule_cnt < rule_cnt)
2921 rule_cnt = actual_rule_cnt;
2922 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2923 &rxnfc->rule_locs[0],
2924 rule_cnt * sizeof(u32)))
2925 return -EFAULT;
2926 }
2927 }
2928
2929 return 0;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002930}
2931
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002932static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2933{
2934 void __user *uptr;
2935 compat_uptr_t uptr32;
2936 struct ifreq __user *uifr;
2937
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002938 uifr = compat_alloc_user_space(sizeof(*uifr));
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002939 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2940 return -EFAULT;
2941
2942 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2943 return -EFAULT;
2944
2945 uptr = compat_ptr(uptr32);
2946
2947 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2948 return -EFAULT;
2949
2950 return dev_ioctl(net, SIOCWANDEV, uifr);
2951}
2952
Arnd Bergmann6b960182009-11-06 23:10:54 -08002953static int bond_ioctl(struct net *net, unsigned int cmd,
2954 struct compat_ifreq __user *ifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002955{
2956 struct ifreq kifr;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002957 mm_segment_t old_fs;
2958 int err;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002959
2960 switch (cmd) {
2961 case SIOCBONDENSLAVE:
2962 case SIOCBONDRELEASE:
2963 case SIOCBONDSETHWADDR:
2964 case SIOCBONDCHANGEACTIVE:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002965 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002966 return -EFAULT;
2967
2968 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002969 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002970 err = dev_ioctl(net, cmd,
2971 (struct ifreq __user __force *) &kifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002972 set_fs(old_fs);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002973
2974 return err;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002975 default:
Linus Torvalds07d106d2012-01-05 15:40:12 -08002976 return -ENOIOCTLCMD;
Joe Perchesccbd6a52010-05-14 10:58:26 +00002977 }
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002978}
2979
Ben Hutchings590d4692013-11-18 17:04:13 +00002980/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
2981static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08002982 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002983{
2984 struct ifreq __user *u_ifreq64;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002985 char tmp_buf[IFNAMSIZ];
2986 void __user *data64;
2987 u32 data32;
2988
2989 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
2990 IFNAMSIZ))
2991 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00002992 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002993 return -EFAULT;
2994 data64 = compat_ptr(data32);
2995
2996 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
2997
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002998 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
2999 IFNAMSIZ))
3000 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00003001 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003002 return -EFAULT;
3003
Arnd Bergmann6b960182009-11-06 23:10:54 -08003004 return dev_ioctl(net, cmd, u_ifreq64);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003005}
3006
Arnd Bergmann6b960182009-11-06 23:10:54 -08003007static int dev_ifsioc(struct net *net, struct socket *sock,
3008 unsigned int cmd, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003009{
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003010 struct ifreq __user *uifr;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003011 int err;
3012
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003013 uifr = compat_alloc_user_space(sizeof(*uifr));
3014 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
3015 return -EFAULT;
3016
3017 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
3018
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003019 if (!err) {
3020 switch (cmd) {
3021 case SIOCGIFFLAGS:
3022 case SIOCGIFMETRIC:
3023 case SIOCGIFMTU:
3024 case SIOCGIFMEM:
3025 case SIOCGIFHWADDR:
3026 case SIOCGIFINDEX:
3027 case SIOCGIFADDR:
3028 case SIOCGIFBRDADDR:
3029 case SIOCGIFDSTADDR:
3030 case SIOCGIFNETMASK:
Arnd Bergmannfab25322009-11-08 20:56:21 -08003031 case SIOCGIFPFLAGS:
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003032 case SIOCGIFTXQLEN:
Arnd Bergmannfab25322009-11-08 20:56:21 -08003033 case SIOCGMIIPHY:
3034 case SIOCGMIIREG:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003035 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003036 err = -EFAULT;
3037 break;
3038 }
3039 }
3040 return err;
3041}
3042
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003043static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
3044 struct compat_ifreq __user *uifr32)
3045{
3046 struct ifreq ifr;
3047 struct compat_ifmap __user *uifmap32;
3048 mm_segment_t old_fs;
3049 int err;
3050
3051 uifmap32 = &uifr32->ifr_ifru.ifru_map;
3052 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003053 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3054 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3055 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3056 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
3057 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
3058 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003059 if (err)
3060 return -EFAULT;
3061
3062 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003063 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003064 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003065 set_fs(old_fs);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003066
3067 if (cmd == SIOCGIFMAP && !err) {
3068 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003069 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3070 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3071 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3072 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
3073 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
3074 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003075 if (err)
3076 err = -EFAULT;
3077 }
3078 return err;
3079}
3080
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003081struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003082 u32 rt_pad1;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003083 struct sockaddr rt_dst; /* target address */
3084 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3085 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003086 unsigned short rt_flags;
3087 short rt_pad2;
3088 u32 rt_pad3;
3089 unsigned char rt_tos;
3090 unsigned char rt_class;
3091 short rt_pad4;
3092 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003093 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003094 u32 rt_mtu; /* per route MTU/Window */
3095 u32 rt_window; /* Window clamping */
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003096 unsigned short rt_irtt; /* Initial RTT */
3097};
3098
3099struct in6_rtmsg32 {
3100 struct in6_addr rtmsg_dst;
3101 struct in6_addr rtmsg_src;
3102 struct in6_addr rtmsg_gateway;
3103 u32 rtmsg_type;
3104 u16 rtmsg_dst_len;
3105 u16 rtmsg_src_len;
3106 u32 rtmsg_metric;
3107 u32 rtmsg_info;
3108 u32 rtmsg_flags;
3109 s32 rtmsg_ifindex;
3110};
3111
Arnd Bergmann6b960182009-11-06 23:10:54 -08003112static int routing_ioctl(struct net *net, struct socket *sock,
3113 unsigned int cmd, void __user *argp)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003114{
3115 int ret;
3116 void *r = NULL;
3117 struct in6_rtmsg r6;
3118 struct rtentry r4;
3119 char devname[16];
3120 u32 rtdev;
3121 mm_segment_t old_fs = get_fs();
3122
Arnd Bergmann6b960182009-11-06 23:10:54 -08003123 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3124 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003125 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003126 3 * sizeof(struct in6_addr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003127 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3128 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3129 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3130 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3131 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3132 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3133 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003134
3135 r = (void *) &r6;
3136 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003137 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003138 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003139 3 * sizeof(struct sockaddr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003140 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3141 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3142 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3143 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3144 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3145 ret |= get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003146 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003147 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003148 r4.rt_dev = (char __user __force *)devname;
3149 devname[15] = 0;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003150 } else
3151 r4.rt_dev = NULL;
3152
3153 r = (void *) &r4;
3154 }
3155
3156 if (ret) {
3157 ret = -EFAULT;
3158 goto out;
3159 }
3160
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003161 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003162 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003163 set_fs(old_fs);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003164
3165out:
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003166 return ret;
3167}
3168
3169/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3170 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003171 * use compatible ioctls
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003172 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003173static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003174{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003175 compat_ulong_t tmp;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003176
Arnd Bergmann6b960182009-11-06 23:10:54 -08003177 if (get_user(tmp, argp))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003178 return -EFAULT;
3179 if (tmp == BRCTL_GET_VERSION)
3180 return BRCTL_VERSION + 1;
3181 return -EINVAL;
3182}
3183
Arnd Bergmann6b960182009-11-06 23:10:54 -08003184static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3185 unsigned int cmd, unsigned long arg)
3186{
3187 void __user *argp = compat_ptr(arg);
3188 struct sock *sk = sock->sk;
3189 struct net *net = sock_net(sk);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003190
Arnd Bergmann6b960182009-11-06 23:10:54 -08003191 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003192 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003193
Arnd Bergmann6b960182009-11-06 23:10:54 -08003194 switch (cmd) {
3195 case SIOCSIFBR:
3196 case SIOCGIFBR:
3197 return old_bridge_ioctl(argp);
3198 case SIOCGIFNAME:
3199 return dev_ifname32(net, argp);
3200 case SIOCGIFCONF:
3201 return dev_ifconf(net, argp);
3202 case SIOCETHTOOL:
3203 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003204 case SIOCWANDEV:
3205 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003206 case SIOCGIFMAP:
3207 case SIOCSIFMAP:
3208 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003209 case SIOCBONDENSLAVE:
3210 case SIOCBONDRELEASE:
3211 case SIOCBONDSETHWADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003212 case SIOCBONDCHANGEACTIVE:
3213 return bond_ioctl(net, cmd, argp);
3214 case SIOCADDRT:
3215 case SIOCDELRT:
3216 return routing_ioctl(net, sock, cmd, argp);
3217 case SIOCGSTAMP:
3218 return do_siocgstamp(net, sock, cmd, argp);
3219 case SIOCGSTAMPNS:
3220 return do_siocgstampns(net, sock, cmd, argp);
Ben Hutchings590d4692013-11-18 17:04:13 +00003221 case SIOCBONDSLAVEINFOQUERY:
3222 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003223 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003224 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003225 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003226
Arnd Bergmann6b960182009-11-06 23:10:54 -08003227 case FIOSETOWN:
3228 case SIOCSPGRP:
3229 case FIOGETOWN:
3230 case SIOCGPGRP:
3231 case SIOCBRADDBR:
3232 case SIOCBRDELBR:
3233 case SIOCGIFVLAN:
3234 case SIOCSIFVLAN:
3235 case SIOCADDDLCI:
3236 case SIOCDELDLCI:
3237 return sock_ioctl(file, cmd, arg);
3238
3239 case SIOCGIFFLAGS:
3240 case SIOCSIFFLAGS:
3241 case SIOCGIFMETRIC:
3242 case SIOCSIFMETRIC:
3243 case SIOCGIFMTU:
3244 case SIOCSIFMTU:
3245 case SIOCGIFMEM:
3246 case SIOCSIFMEM:
3247 case SIOCGIFHWADDR:
3248 case SIOCSIFHWADDR:
3249 case SIOCADDMULTI:
3250 case SIOCDELMULTI:
3251 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003252 case SIOCGIFADDR:
3253 case SIOCSIFADDR:
3254 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003255 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003256 case SIOCGIFBRDADDR:
3257 case SIOCSIFBRDADDR:
3258 case SIOCGIFDSTADDR:
3259 case SIOCSIFDSTADDR:
3260 case SIOCGIFNETMASK:
3261 case SIOCSIFNETMASK:
3262 case SIOCSIFPFLAGS:
3263 case SIOCGIFPFLAGS:
3264 case SIOCGIFTXQLEN:
3265 case SIOCSIFTXQLEN:
3266 case SIOCBRADDIF:
3267 case SIOCBRDELIF:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003268 case SIOCSIFNAME:
3269 case SIOCGMIIPHY:
3270 case SIOCGMIIREG:
3271 case SIOCSMIIREG:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003272 return dev_ifsioc(net, sock, cmd, argp);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003273
Arnd Bergmann6b960182009-11-06 23:10:54 -08003274 case SIOCSARP:
3275 case SIOCGARP:
3276 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003277 case SIOCATMARK:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003278 return sock_do_ioctl(net, sock, cmd, arg);
3279 }
3280
Arnd Bergmann6b960182009-11-06 23:10:54 -08003281 return -ENOIOCTLCMD;
3282}
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003283
Eric Dumazet95c96172012-04-15 05:58:06 +00003284static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003285 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003286{
3287 struct socket *sock = file->private_data;
3288 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003289 struct sock *sk;
3290 struct net *net;
3291
3292 sk = sock->sk;
3293 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003294
3295 if (sock->ops->compat_ioctl)
3296 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3297
David S. Miller87de87d2008-06-03 09:14:03 -07003298 if (ret == -ENOIOCTLCMD &&
3299 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3300 ret = compat_wext_handle_ioctl(net, cmd, arg);
3301
Arnd Bergmann6b960182009-11-06 23:10:54 -08003302 if (ret == -ENOIOCTLCMD)
3303 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3304
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003305 return ret;
3306}
3307#endif
3308
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003309int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3310{
3311 return sock->ops->bind(sock, addr, addrlen);
3312}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003313EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003314
3315int kernel_listen(struct socket *sock, int backlog)
3316{
3317 return sock->ops->listen(sock, backlog);
3318}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003319EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003320
3321int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3322{
3323 struct sock *sk = sock->sk;
3324 int err;
3325
3326 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3327 newsock);
3328 if (err < 0)
3329 goto done;
3330
3331 err = sock->ops->accept(sock, *newsock, flags);
3332 if (err < 0) {
3333 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003334 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003335 goto done;
3336 }
3337
3338 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003339 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003340
3341done:
3342 return err;
3343}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003344EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003345
3346int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003347 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003348{
3349 return sock->ops->connect(sock, addr, addrlen, flags);
3350}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003351EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003352
3353int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3354 int *addrlen)
3355{
3356 return sock->ops->getname(sock, addr, addrlen, 0);
3357}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003358EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003359
3360int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3361 int *addrlen)
3362{
3363 return sock->ops->getname(sock, addr, addrlen, 1);
3364}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003365EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003366
3367int kernel_getsockopt(struct socket *sock, int level, int optname,
3368 char *optval, int *optlen)
3369{
3370 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003371 char __user *uoptval;
3372 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003373 int err;
3374
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003375 uoptval = (char __user __force *) optval;
3376 uoptlen = (int __user __force *) optlen;
3377
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003378 set_fs(KERNEL_DS);
3379 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003380 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003381 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003382 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3383 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003384 set_fs(oldfs);
3385 return err;
3386}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003387EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003388
3389int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003390 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003391{
3392 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003393 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003394 int err;
3395
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003396 uoptval = (char __user __force *) optval;
3397
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003398 set_fs(KERNEL_DS);
3399 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003400 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003401 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003402 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003403 optlen);
3404 set_fs(oldfs);
3405 return err;
3406}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003407EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003408
3409int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3410 size_t size, int flags)
3411{
3412 if (sock->ops->sendpage)
3413 return sock->ops->sendpage(sock, page, offset, size, flags);
3414
3415 return sock_no_sendpage(sock, page, offset, size, flags);
3416}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003417EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003418
3419int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3420{
3421 mm_segment_t oldfs = get_fs();
3422 int err;
3423
3424 set_fs(KERNEL_DS);
3425 err = sock->ops->ioctl(sock, cmd, arg);
3426 set_fs(oldfs);
3427
3428 return err;
3429}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003430EXPORT_SYMBOL(kernel_sock_ioctl);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003431
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003432int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3433{
3434 return sock->ops->shutdown(sock, how);
3435}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003436EXPORT_SYMBOL(kernel_sock_shutdown);