blob: a4fb47262f0b0a0152842289b84c2d33d48d9b1d [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>
Yida Wang0bf43bd2017-03-22 18:16:31 -040092#include <linux/seemp_api.h>
93#include <linux/seemp_instrumentation.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
95#include <asm/uaccess.h>
96#include <asm/unistd.h>
97
98#include <net/compat.h>
David S. Miller87de87d2008-06-03 09:14:03 -070099#include <net/wext.h>
Herbert Xuf8451722010-05-24 00:12:34 -0700100#include <net/cls_cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
102#include <net/sock.h>
103#include <linux/netfilter.h>
104
Arnd Bergmann6b960182009-11-06 23:10:54 -0800105#include <linux/if_tun.h>
106#include <linux/ipv6_route.h>
107#include <linux/route.h>
Arnd Bergmann6b960182009-11-06 23:10:54 -0800108#include <linux/sockios.h>
109#include <linux/atalk.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +0300110#include <net/busy_poll.h>
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400111#include <linux/errqueue.h>
Eliezer Tamir06021292013-06-10 11:39:50 +0300112
Cong Wange0d10952013-08-01 11:10:25 +0800113#ifdef CONFIG_NET_RX_BUSY_POLL
Eliezer Tamir64b0dc52013-07-10 17:13:36 +0300114unsigned int sysctl_net_busy_read __read_mostly;
115unsigned int sysctl_net_busy_poll __read_mostly;
Eliezer Tamir06021292013-06-10 11:39:50 +0300116#endif
Arnd Bergmann6b960182009-11-06 23:10:54 -0800117
Al Viro8ae5e032014-11-28 19:40:50 -0500118static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to);
119static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from);
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,
Al Viro8ae5e032014-11-28 19:40:50 -0500145 .read_iter = sock_read_iter,
146 .write_iter = sock_write_iter,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 .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;
Nicolai Stange574aab12015-12-29 13:29:55 +0100262 wq->flags = 0;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000263 RCU_INIT_POINTER(ei->socket.wq, wq);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 ei->socket.state = SS_UNCONNECTED;
266 ei->socket.flags = 0;
267 ei->socket.ops = NULL;
268 ei->socket.sk = NULL;
269 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 return &ei->vfs_inode;
272}
273
274static void sock_destroy_inode(struct inode *inode)
275{
Eric Dumazet43815482010-04-29 11:01:49 +0000276 struct socket_alloc *ei;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000277 struct socket_wq *wq;
Eric Dumazet43815482010-04-29 11:01:49 +0000278
279 ei = container_of(inode, struct socket_alloc, vfs_inode);
Eric Dumazeteaefd112011-02-18 03:26:36 +0000280 wq = rcu_dereference_protected(ei->socket.wq, 1);
Lai Jiangshan61845222011-03-18 12:10:25 +0800281 kfree_rcu(wq, rcu);
Eric Dumazet43815482010-04-29 11:01:49 +0000282 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700285static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700287 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Christoph Lametera35afb82007-05-16 22:10:57 -0700289 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292static int init_inodecache(void)
293{
294 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700295 sizeof(struct socket_alloc),
296 0,
297 (SLAB_HWCACHE_ALIGN |
298 SLAB_RECLAIM_ACCOUNT |
Vladimir Davydov5d097052016-01-14 15:18:21 -0800299 SLAB_MEM_SPREAD | SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +0900300 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 if (sock_inode_cachep == NULL)
302 return -ENOMEM;
303 return 0;
304}
305
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700306static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700307 .alloc_inode = sock_alloc_inode,
308 .destroy_inode = sock_destroy_inode,
309 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310};
311
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700312/*
313 * sockfs_dname() is called from d_path().
314 */
315static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
316{
317 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
David Howellsc5ef6032015-03-17 22:26:16 +0000318 d_inode(dentry)->i_ino);
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700319}
320
Al Viro3ba13d12009-02-20 06:02:22 +0000321static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700322 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323};
324
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200325static int sockfs_xattr_get(const struct xattr_handler *handler,
326 struct dentry *dentry, struct inode *inode,
327 const char *suffix, void *value, size_t size)
328{
329 if (value) {
330 if (dentry->d_name.len + 1 > size)
331 return -ERANGE;
332 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
333 }
334 return dentry->d_name.len + 1;
335}
336
337#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
338#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
339#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
340
341static const struct xattr_handler sockfs_xattr_handler = {
342 .name = XATTR_NAME_SOCKPROTONAME,
343 .get = sockfs_xattr_get,
344};
345
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100346static int sockfs_security_xattr_set(const struct xattr_handler *handler,
347 struct dentry *dentry, struct inode *inode,
348 const char *suffix, const void *value,
349 size_t size, int flags)
350{
351 /* Handled by LSM. */
352 return -EAGAIN;
353}
354
355static const struct xattr_handler sockfs_security_xattr_handler = {
356 .prefix = XATTR_SECURITY_PREFIX,
357 .set = sockfs_security_xattr_set,
358};
359
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200360static const struct xattr_handler *sockfs_xattr_handlers[] = {
361 &sockfs_xattr_handler,
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100362 &sockfs_security_xattr_handler,
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200363 NULL
364};
365
Al Viroc74a1cb2011-01-12 16:59:34 -0500366static struct dentry *sockfs_mount(struct file_system_type *fs_type,
367 int flags, const char *dev_name, void *data)
368{
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200369 return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops,
370 sockfs_xattr_handlers,
371 &sockfs_dentry_operations, SOCKFS_MAGIC);
Al Viroc74a1cb2011-01-12 16:59:34 -0500372}
373
374static struct vfsmount *sock_mnt __read_mostly;
375
376static struct file_system_type sock_fs_type = {
377 .name = "sockfs",
378 .mount = sockfs_mount,
379 .kill_sb = kill_anon_super,
380};
381
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382/*
383 * Obtains the first available file descriptor and sets it up for use.
384 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800385 * These functions create file structures and maps them to fd space
386 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 * and file struct implicitly stored in sock->file.
388 * Note that another thread may close file descriptor before we return
389 * from this function. We use the fact that now we do not refer
390 * to socket after mapping. If one day we will need it, this
391 * function will increment ref. count on file by 1.
392 *
393 * In any case returned fd MAY BE not valid!
394 * This race condition is unavoidable
395 * with shared fd spaces, we cannot solve it inside kernel,
396 * but we take care of internal coherence yet.
397 */
398
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700399struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400{
Al Viro7cbe66b2009-08-05 19:59:08 +0400401 struct qstr name = { .name = "" };
Al Viro2c48b9c2009-08-09 00:52:35 +0400402 struct path path;
Al Viro7cbe66b2009-08-05 19:59:08 +0400403 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800404
Masatake YAMATO600e1772012-08-29 10:44:29 +0000405 if (dname) {
406 name.name = dname;
407 name.len = strlen(name.name);
408 } else if (sock->sk) {
409 name.name = sock->sk->sk_prot_creator->name;
410 name.len = strlen(name.name);
411 }
Nick Piggin4b936882011-01-07 17:50:07 +1100412 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
Al Viro28407632012-08-17 23:54:15 -0400413 if (unlikely(!path.dentry))
414 return ERR_PTR(-ENOMEM);
Al Viro2c48b9c2009-08-09 00:52:35 +0400415 path.mnt = mntget(sock_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
Al Viro2c48b9c2009-08-09 00:52:35 +0400417 d_instantiate(path.dentry, SOCK_INODE(sock));
Al Virocc3808f2009-08-06 09:43:59 +0400418
Al Viro2c48b9c2009-08-09 00:52:35 +0400419 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
Al Virocc3808f2009-08-06 09:43:59 +0400420 &socket_file_ops);
Viresh Kumarb5ffe632015-08-12 15:59:47 +0530421 if (IS_ERR(file)) {
Al Virocc3808f2009-08-06 09:43:59 +0400422 /* drop dentry, keep inode */
David Howellsc5ef6032015-03-17 22:26:16 +0000423 ihold(d_inode(path.dentry));
Al Viro2c48b9c2009-08-09 00:52:35 +0400424 path_put(&path);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700425 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400426 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800427
428 sock->file = file;
Ulrich Drepper77d27202008-07-23 21:29:35 -0700429 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800430 file->private_data = sock;
Al Viro28407632012-08-17 23:54:15 -0400431 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800432}
Al Viro56b31d12012-08-18 00:25:51 -0400433EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800434
Al Viro56b31d12012-08-18 00:25:51 -0400435static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800436{
437 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400438 int fd = get_unused_fd_flags(flags);
439 if (unlikely(fd < 0))
440 return fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800441
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700442 newfile = sock_alloc_file(sock, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -0400443 if (likely(!IS_ERR(newfile))) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800444 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400445 return fd;
446 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400447
Al Viro28407632012-08-17 23:54:15 -0400448 put_unused_fd(fd);
449 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450}
451
John Fastabend406a3c62012-07-20 10:39:25 +0000452struct socket *sock_from_file(struct file *file, int *err)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800453{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800454 if (file->f_op == &socket_file_ops)
455 return file->private_data; /* set in sock_map_fd */
456
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800457 *err = -ENOTSOCK;
458 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800459}
John Fastabend406a3c62012-07-20 10:39:25 +0000460EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800461
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700463 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 * @fd: file handle
465 * @err: pointer to an error code return
466 *
467 * The file handle passed in is locked and the socket it is bound
468 * too is returned. If an error occurs the err pointer is overwritten
469 * with a negative errno code and NULL is returned. The function checks
470 * for both invalid handles and passing a handle which is not a socket.
471 *
472 * On a success the socket object pointer is returned.
473 */
474
475struct socket *sockfd_lookup(int fd, int *err)
476{
477 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 struct socket *sock;
479
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700480 file = fget(fd);
481 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 *err = -EBADF;
483 return NULL;
484 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700485
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800486 sock = sock_from_file(file, err);
487 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 return sock;
490}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700491EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800493static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
494{
Al Viro00e188e2014-03-03 23:48:18 -0500495 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800496 struct socket *sock;
497
Hua Zhong36725582006-04-19 15:25:02 -0700498 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500499 if (f.file) {
500 sock = sock_from_file(f.file, err);
501 if (likely(sock)) {
502 *fput_needed = f.flags;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800503 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500504 }
505 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800506 }
507 return NULL;
508}
509
Masatake YAMATO600e1772012-08-29 10:44:29 +0000510static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
511 size_t size)
512{
513 ssize_t len;
514 ssize_t used = 0;
515
David Howellsc5ef6032015-03-17 22:26:16 +0000516 len = security_inode_listsecurity(d_inode(dentry), buffer, size);
Masatake YAMATO600e1772012-08-29 10:44:29 +0000517 if (len < 0)
518 return len;
519 used += len;
520 if (buffer) {
521 if (size < used)
522 return -ERANGE;
523 buffer += len;
524 }
525
526 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
527 used += len;
528 if (buffer) {
529 if (size < used)
530 return -ERANGE;
531 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
532 buffer += len;
533 }
534
535 return used;
536}
537
Tobias Klauserb68cf932017-01-10 09:30:51 +0100538static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr)
Lorenzo Colitti81a15912016-11-04 02:23:41 +0900539{
540 int err = simple_setattr(dentry, iattr);
541
Eric Biggers1452d392016-12-30 17:42:32 -0600542 if (!err && (iattr->ia_valid & ATTR_UID)) {
Lorenzo Colitti81a15912016-11-04 02:23:41 +0900543 struct socket *sock = SOCKET_I(d_inode(dentry));
544
545 sock->sk->sk_uid = iattr->ia_uid;
546 }
547
548 return err;
549}
550
Masatake YAMATO600e1772012-08-29 10:44:29 +0000551static const struct inode_operations sockfs_inode_ops = {
Masatake YAMATO600e1772012-08-29 10:44:29 +0000552 .listxattr = sockfs_listxattr,
Lorenzo Colitti81a15912016-11-04 02:23:41 +0900553 .setattr = sockfs_setattr,
Masatake YAMATO600e1772012-08-29 10:44:29 +0000554};
555
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556/**
557 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700558 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 * Allocate a new inode and socket object. The two are bound together
560 * and initialised. The socket is then returned. If we are out of inodes
561 * NULL is returned.
562 */
563
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800564struct socket *sock_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700566 struct inode *inode;
567 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200569 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 if (!inode)
571 return NULL;
572
573 sock = SOCKET_I(inode);
574
Eric Dumazet29a020d2009-09-15 02:39:20 -0700575 kmemcheck_annotate_bitfield(sock, type);
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400576 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700577 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100578 inode->i_uid = current_fsuid();
579 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000580 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
Alex Shi19e8d692012-05-14 14:15:31 -0700582 this_cpu_add(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 return sock;
584}
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800585EXPORT_SYMBOL(sock_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587/**
588 * sock_release - close a socket
589 * @sock: socket to close
590 *
591 * The socket is released from the protocol stack if it has a release
592 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700593 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700595
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596void sock_release(struct socket *sock)
597{
598 if (sock->ops) {
599 struct module *owner = sock->ops->owner;
600
601 sock->ops->release(sock);
602 sock->ops = NULL;
603 module_put(owner);
604 }
605
Eric Dumazeteaefd112011-02-18 03:26:36 +0000606 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800607 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Alex Shi19e8d692012-05-14 14:15:31 -0700609 this_cpu_sub(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 if (!sock->file) {
611 iput(SOCK_INODE(sock));
612 return;
613 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700614 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700616EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400618void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000619{
Eric Dumazet140c55d2014-08-06 11:49:29 +0200620 u8 flags = *tx_flags;
621
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400622 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200623 flags |= SKBTX_HW_TSTAMP;
624
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400625 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200626 flags |= SKBTX_SW_TSTAMP;
627
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400628 if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200629 flags |= SKBTX_SCHED_TSTAMP;
630
Eric Dumazet140c55d2014-08-06 11:49:29 +0200631 *tx_flags = flags;
Patrick Ohly20d49472009-02-12 05:03:38 +0000632}
Willem de Bruijn67cc0d42014-09-08 19:58:58 -0400633EXPORT_SYMBOL(__sock_tx_timestamp);
Patrick Ohly20d49472009-02-12 05:03:38 +0000634
Al Virod8725c82014-12-11 00:02:50 -0500635static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636{
Al Viro01e97e62014-12-15 21:39:31 -0500637 int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg));
Al Virod8725c82014-12-11 00:02:50 -0500638 BUG_ON(ret == -EIOCBQUEUED);
639 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640}
Gu Zheng0cf00c62014-12-05 15:14:23 +0800641
Al Virod8725c82014-12-11 00:02:50 -0500642int sock_sendmsg(struct socket *sock, struct msghdr *msg)
Gu Zheng0cf00c62014-12-05 15:14:23 +0800643{
Al Virod8725c82014-12-11 00:02:50 -0500644 int err = security_socket_sendmsg(sock, msg,
Al Viro01e97e62014-12-15 21:39:31 -0500645 msg_data_left(msg));
Ying Xue1b784142015-03-02 15:37:48 +0800646
Al Virod8725c82014-12-11 00:02:50 -0500647 return err ?: sock_sendmsg_nosec(sock, msg);
Gu Zheng0cf00c62014-12-05 15:14:23 +0800648}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700649EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
651int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
652 struct kvec *vec, size_t num, size_t size)
653{
Al Viro6aa24812015-03-21 19:56:16 -0400654 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size);
Al Virod8725c82014-12-11 00:02:50 -0500655 return sock_sendmsg(sock, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700657EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700659/*
660 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
661 */
662void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
663 struct sk_buff *skb)
664{
Patrick Ohly20d49472009-02-12 05:03:38 +0000665 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400666 struct scm_timestamping tss;
Patrick Ohly20d49472009-02-12 05:03:38 +0000667 int empty = 1;
668 struct skb_shared_hwtstamps *shhwtstamps =
669 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700670
Patrick Ohly20d49472009-02-12 05:03:38 +0000671 /* Race occurred between timestamp enabling and packet
672 receiving. Fill in the current time for now. */
673 if (need_software_tstamp && skb->tstamp.tv64 == 0)
674 __net_timestamp(skb);
675
676 if (need_software_tstamp) {
677 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
678 struct timeval tv;
679 skb_get_timestamp(skb, &tv);
680 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
681 sizeof(tv), &tv);
682 } else {
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400683 struct timespec ts;
684 skb_get_timestampns(skb, &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000685 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400686 sizeof(ts), &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000687 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700688 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000689
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400690 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400691 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400692 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000693 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400694 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400695 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400696 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2))
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400697 empty = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000698 if (!empty)
699 put_cmsg(msg, SOL_SOCKET,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400700 SCM_TIMESTAMPING, sizeof(tss), &tss);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700701}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300702EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
703
Johannes Berg6e3e9392011-11-09 10:15:42 +0100704void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
705 struct sk_buff *skb)
706{
707 int ack;
708
709 if (!sock_flag(sk, SOCK_WIFI_STATUS))
710 return;
711 if (!skb->wifi_acked_valid)
712 return;
713
714 ack = skb->wifi_acked;
715
716 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
717}
718EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
719
stephen hemminger11165f12010-10-18 14:27:29 +0000720static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
721 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700722{
Eyal Birger744d5a32015-03-01 14:58:31 +0200723 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
Neil Horman3b885782009-10-12 13:26:31 -0700724 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
Eyal Birger744d5a32015-03-01 14:58:31 +0200725 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
Neil Horman3b885782009-10-12 13:26:31 -0700726}
727
Eric Dumazet767dd032010-04-28 19:14:43 +0000728void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700729 struct sk_buff *skb)
730{
731 sock_recv_timestamp(msg, sk, skb);
732 sock_recv_drops(msg, sk, skb);
733}
Eric Dumazet767dd032010-04-28 19:14:43 +0000734EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700735
Ying Xue1b784142015-03-02 15:37:48 +0800736static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
Al Viro2da62902015-03-14 21:13:46 -0400737 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738{
Al Viro2da62902015-03-14 21:13:46 -0400739 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740}
741
Al Viro2da62902015-03-14 21:13:46 -0400742int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700743{
Al Viro2da62902015-03-14 21:13:46 -0400744 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700745
Al Viro2da62902015-03-14 21:13:46 -0400746 return err ?: sock_recvmsg_nosec(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700748EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
Martin Lucinac1249c02010-12-10 00:04:05 +0000750/**
751 * kernel_recvmsg - Receive a message from a socket (kernel space)
752 * @sock: The socket to receive the message from
753 * @msg: Received message
754 * @vec: Input s/g array for message data
755 * @num: Size of input s/g array
756 * @size: Number of bytes to read
757 * @flags: Message flags (MSG_DONTWAIT, etc...)
758 *
759 * On return the msg structure contains the scatter/gather array passed in the
760 * vec argument. The array is modified so that it consists of the unfilled
761 * portion of the original array.
762 *
763 * The returned value is the total number of bytes received, or an error.
764 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700765int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
766 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
768 mm_segment_t oldfs = get_fs();
769 int result;
770
Al Viro6aa24812015-03-21 19:56:16 -0400771 iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 set_fs(KERNEL_DS);
Al Viro2da62902015-03-14 21:13:46 -0400773 result = sock_recvmsg(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 set_fs(oldfs);
775 return result;
776}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700777EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300779static ssize_t sock_sendpage(struct file *file, struct page *page,
780 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781{
782 struct socket *sock;
783 int flags;
784
Eric Dumazetb69aee02005-09-06 14:42:45 -0700785 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
Eric Dumazet35f9c092012-04-05 03:05:35 +0000787 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
788 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
789 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
Linus Torvaldse6949582009-08-13 08:28:36 -0700791 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792}
793
Jens Axboe9c55e012007-11-06 23:30:13 -0800794static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700795 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800796 unsigned int flags)
797{
798 struct socket *sock = file->private_data;
799
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800800 if (unlikely(!sock->ops->splice_read))
801 return -EINVAL;
802
Jens Axboe9c55e012007-11-06 23:30:13 -0800803 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
804}
805
Al Viro8ae5e032014-11-28 19:40:50 -0500806static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800807{
Al Viro6d652332015-01-30 16:12:56 -0500808 struct file *file = iocb->ki_filp;
809 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700810 struct msghdr msg = {.msg_iter = *to,
811 .msg_iocb = iocb};
Al Viro8ae5e032014-11-28 19:40:50 -0500812 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800813
Al Viro8ae5e032014-11-28 19:40:50 -0500814 if (file->f_flags & O_NONBLOCK)
815 msg.msg_flags = MSG_DONTWAIT;
816
817 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800818 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700819
Christoph Hellwig66ee59a2015-02-11 19:56:46 +0100820 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800821 return 0;
822
Al Viro2da62902015-03-14 21:13:46 -0400823 res = sock_recvmsg(sock, &msg, msg.msg_flags);
Al Viro8ae5e032014-11-28 19:40:50 -0500824 *to = msg.msg_iter;
825 return res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800826}
827
Al Viro8ae5e032014-11-28 19:40:50 -0500828static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829{
Al Viro6d652332015-01-30 16:12:56 -0500830 struct file *file = iocb->ki_filp;
831 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700832 struct msghdr msg = {.msg_iter = *from,
833 .msg_iocb = iocb};
Al Viro8ae5e032014-11-28 19:40:50 -0500834 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800835
Al Viro8ae5e032014-11-28 19:40:50 -0500836 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800837 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700838
Al Viro8ae5e032014-11-28 19:40:50 -0500839 if (file->f_flags & O_NONBLOCK)
840 msg.msg_flags = MSG_DONTWAIT;
841
Al Viro6d652332015-01-30 16:12:56 -0500842 if (sock->type == SOCK_SEQPACKET)
843 msg.msg_flags |= MSG_EOR;
844
Al Virod8725c82014-12-11 00:02:50 -0500845 res = sock_sendmsg(sock, &msg);
Al Viro8ae5e032014-11-28 19:40:50 -0500846 *from = msg.msg_iter;
847 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848}
849
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850/*
851 * Atomic setting of ioctl hooks to avoid race
852 * with module unload.
853 */
854
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800855static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700856static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
Eric W. Biederman881d9662007-09-17 11:56:21 -0700858void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800860 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800862 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863}
864EXPORT_SYMBOL(brioctl_set);
865
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800866static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700867static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
Eric W. Biederman881d9662007-09-17 11:56:21 -0700869void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800871 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800873 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874}
875EXPORT_SYMBOL(vlan_ioctl_set);
876
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800877static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700878static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700880void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800882 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800884 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885}
886EXPORT_SYMBOL(dlci_ioctl_set);
887
Arnd Bergmann6b960182009-11-06 23:10:54 -0800888static long sock_do_ioctl(struct net *net, struct socket *sock,
889 unsigned int cmd, unsigned long arg)
890{
891 int err;
892 void __user *argp = (void __user *)arg;
893
894 err = sock->ops->ioctl(sock, cmd, arg);
895
896 /*
897 * If this ioctl is unknown try to hand it down
898 * to the NIC driver.
899 */
900 if (err == -ENOIOCTLCMD)
901 err = dev_ioctl(net, cmd, argp);
902
903 return err;
904}
905
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906/*
907 * With an ioctl, arg may well be a user mode pointer, but we don't know
908 * what to do with it - that's up to the protocol still.
909 */
910
911static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
912{
913 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700914 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 void __user *argp = (void __user *)arg;
916 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700917 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
Eric Dumazetb69aee02005-09-06 14:42:45 -0700919 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700920 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900921 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700923 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 } else
Johannes Berg3d23e342009-09-29 23:27:28 +0200925#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700927 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 } else
Johannes Berg3d23e342009-09-29 23:27:28 +0200929#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700930 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 case FIOSETOWN:
932 case SIOCSPGRP:
933 err = -EFAULT;
934 if (get_user(pid, (int __user *)argp))
935 break;
Jeff Laytone0b93ed2014-08-22 11:27:32 -0400936 f_setown(sock->file, pid, 1);
937 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 break;
939 case FIOGETOWN:
940 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700941 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700942 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 break;
944 case SIOCGIFBR:
945 case SIOCSIFBR:
946 case SIOCBRADDBR:
947 case SIOCBRDELBR:
948 err = -ENOPKG;
949 if (!br_ioctl_hook)
950 request_module("bridge");
951
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800952 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700953 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700954 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800955 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 break;
957 case SIOCGIFVLAN:
958 case SIOCSIFVLAN:
959 err = -ENOPKG;
960 if (!vlan_ioctl_hook)
961 request_module("8021q");
962
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800963 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700965 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800966 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 case SIOCADDDLCI:
969 case SIOCDELDLCI:
970 err = -ENOPKG;
971 if (!dlci_ioctl_hook)
972 request_module("dlci");
973
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -0700974 mutex_lock(&dlci_ioctl_mutex);
975 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -0700977 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 break;
979 default:
Arnd Bergmann6b960182009-11-06 23:10:54 -0800980 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700982 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 return err;
984}
985
986int sock_create_lite(int family, int type, int protocol, struct socket **res)
987{
988 int err;
989 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700990
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 err = security_socket_create(family, type, protocol, 1);
992 if (err)
993 goto out;
994
995 sock = sock_alloc();
996 if (!sock) {
997 err = -ENOMEM;
998 goto out;
999 }
1000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001002 err = security_socket_post_create(sock, family, type, protocol, 1);
1003 if (err)
1004 goto out_release;
1005
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006out:
1007 *res = sock;
1008 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001009out_release:
1010 sock_release(sock);
1011 sock = NULL;
1012 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001014EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
1016/* No kernel lock held - perfect */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001017static unsigned int sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018{
Eliezer Tamircbf55002013-07-08 16:20:34 +03001019 unsigned int busy_flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 struct socket *sock;
1021
1022 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001023 * We can't return errors to poll, so it's either yes or no.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 */
Eric Dumazetb69aee02005-09-06 14:42:45 -07001025 sock = file->private_data;
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001026
Eliezer Tamircbf55002013-07-08 16:20:34 +03001027 if (sk_can_busy_loop(sock->sk)) {
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001028 /* this socket can poll_ll so tell the system call */
Eliezer Tamircbf55002013-07-08 16:20:34 +03001029 busy_flag = POLL_BUSY_LOOP;
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001030
1031 /* once, only if requested by syscall */
Eliezer Tamircbf55002013-07-08 16:20:34 +03001032 if (wait && (wait->_key & POLL_BUSY_LOOP))
1033 sk_busy_loop(sock->sk, 1);
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001034 }
1035
Eliezer Tamircbf55002013-07-08 16:20:34 +03001036 return busy_flag | sock->ops->poll(file, sock, wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037}
1038
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001039static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001041 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042
1043 return sock->ops->mmap(file, sock, vma);
1044}
1045
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001046static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 sock_release(SOCKET_I(inode));
1049 return 0;
1050}
1051
1052/*
1053 * Update the socket async list
1054 *
1055 * Fasync_list locking strategy.
1056 *
1057 * 1. fasync_list is modified only under process context socket lock
1058 * i.e. under semaphore.
1059 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001060 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 */
1062
1063static int sock_fasync(int fd, struct file *filp, int on)
1064{
Eric Dumazet989a2972010-04-14 09:55:35 +00001065 struct socket *sock = filp->private_data;
1066 struct sock *sk = sock->sk;
Eric Dumazeteaefd112011-02-18 03:26:36 +00001067 struct socket_wq *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068
Eric Dumazet989a2972010-04-14 09:55:35 +00001069 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071
1072 lock_sock(sk);
Hannes Frederic Sowa1e1d04e2016-04-05 17:10:15 +02001073 wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk));
Eric Dumazeteaefd112011-02-18 03:26:36 +00001074 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075
Eric Dumazeteaefd112011-02-18 03:26:36 +00001076 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001077 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001078 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001079 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080
Eric Dumazet989a2972010-04-14 09:55:35 +00001081 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 return 0;
1083}
1084
Eric Dumazetceb5d582015-11-29 20:03:11 -08001085/* This function may be called only under rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086
Eric Dumazetceb5d582015-11-29 20:03:11 -08001087int sock_wake_async(struct socket_wq *wq, int how, int band)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088{
Eric Dumazetceb5d582015-11-29 20:03:11 -08001089 if (!wq || !wq->fasync_list)
1090 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001091
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001092 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001093 case SOCK_WAKE_WAITD:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001094 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 break;
1096 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001097 case SOCK_WAKE_SPACE:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001098 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 break;
1100 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001101 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001102call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001103 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001105 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001106 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08001108
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 return 0;
1110}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001111EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112
Pavel Emelyanov721db932010-09-29 16:06:32 +04001113int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001114 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115{
1116 int err;
1117 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001118 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119
1120 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001121 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 */
1123 if (family < 0 || family >= NPROTO)
1124 return -EAFNOSUPPORT;
1125 if (type < 0 || type >= SOCK_MAX)
1126 return -EINVAL;
1127
1128 /* Compatibility.
1129
1130 This uglymoron is moved from INET layer to here to avoid
1131 deadlock in module load.
1132 */
1133 if (family == PF_INET && type == SOCK_PACKET) {
liping.zhangf3c98692016-03-11 23:08:36 +08001134 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1135 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 family = PF_PACKET;
1137 }
1138
1139 err = security_socket_create(family, type, protocol, kern);
1140 if (err)
1141 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001142
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001143 /*
1144 * Allocate the socket and allow the family to set things up. if
1145 * the protocol is 0, the family is instructed to select an appropriate
1146 * default.
1147 */
1148 sock = sock_alloc();
1149 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001150 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001151 return -ENFILE; /* Not exactly a match, but its the
1152 closest posix thing */
1153 }
1154
1155 sock->type = type;
1156
Johannes Berg95a5afc2008-10-16 15:24:51 -07001157#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001158 /* Attempt to load a protocol module if the find failed.
1159 *
1160 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 * requested real, full-featured networking support upon configuration.
1162 * Otherwise module support will break!
1163 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001164 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001165 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166#endif
1167
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001168 rcu_read_lock();
1169 pf = rcu_dereference(net_families[family]);
1170 err = -EAFNOSUPPORT;
1171 if (!pf)
1172 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173
1174 /*
1175 * We will call the ->create function, that possibly is in a loadable
1176 * module, so we have to bump that loadable module refcnt first.
1177 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001178 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 goto out_release;
1180
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001181 /* Now protected by module ref count */
1182 rcu_read_unlock();
1183
Eric Paris3f378b62009-11-05 22:18:14 -08001184 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001185 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001187
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 /*
1189 * Now to bump the refcnt of the [loadable] module that owns this
1190 * socket at sock_release time we decrement its refcnt.
1191 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001192 if (!try_module_get(sock->ops->owner))
1193 goto out_module_busy;
1194
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 /*
1196 * Now that we're done with the ->create function, the [loadable]
1197 * module can have its refcnt decremented
1198 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001199 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001200 err = security_socket_post_create(sock, family, type, protocol, kern);
1201 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001202 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001203 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001205 return 0;
1206
1207out_module_busy:
1208 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001210 sock->ops = NULL;
1211 module_put(pf->owner);
1212out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001214 return err;
1215
1216out_release:
1217 rcu_read_unlock();
1218 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001220EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221
1222int sock_create(int family, int type, int protocol, struct socket **res)
1223{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001224 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001226EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001228int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229{
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001230 return __sock_create(net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001232EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001234SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235{
1236 int retval;
1237 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001238 int flags;
1239
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001240 /* Check the SOCK_* constants for consistency. */
1241 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1242 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1243 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1244 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1245
Ulrich Dreppera677a032008-07-23 21:29:17 -07001246 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001247 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001248 return -EINVAL;
1249 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001251 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1252 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1253
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 retval = sock_create(family, type, protocol, &sock);
1255 if (retval < 0)
1256 goto out;
1257
Ulrich Drepper77d27202008-07-23 21:29:35 -07001258 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 if (retval < 0)
1260 goto out_release;
1261
1262out:
1263 /* It may be already another descriptor 8) Not kernel problem. */
1264 return retval;
1265
1266out_release:
1267 sock_release(sock);
1268 return retval;
1269}
1270
1271/*
1272 * Create a pair of connected sockets.
1273 */
1274
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001275SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1276 int __user *, usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277{
1278 struct socket *sock1, *sock2;
1279 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001280 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001281 int flags;
1282
1283 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001284 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001285 return -EINVAL;
1286 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001288 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1289 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1290
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 /*
1292 * Obtain the first socket and check if the underlying protocol
1293 * supports the socketpair call.
1294 */
1295
1296 err = sock_create(family, type, protocol, &sock1);
1297 if (err < 0)
1298 goto out;
1299
1300 err = sock_create(family, type, protocol, &sock2);
1301 if (err < 0)
1302 goto out_release_1;
1303
1304 err = sock1->ops->socketpair(sock1, sock2);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001305 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 goto out_release_both;
1307
Al Viro28407632012-08-17 23:54:15 -04001308 fd1 = get_unused_fd_flags(flags);
David S. Millerbf3c23d2007-10-29 21:54:02 -07001309 if (unlikely(fd1 < 0)) {
1310 err = fd1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 goto out_release_both;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001312 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001313
Al Viro28407632012-08-17 23:54:15 -04001314 fd2 = get_unused_fd_flags(flags);
Al Viro198de4d2009-08-05 19:29:23 +04001315 if (unlikely(fd2 < 0)) {
1316 err = fd2;
Yann Droneaudd73aa282013-12-09 22:42:20 +01001317 goto out_put_unused_1;
Al Viro28407632012-08-17 23:54:15 -04001318 }
1319
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001320 newfile1 = sock_alloc_file(sock1, flags, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301321 if (IS_ERR(newfile1)) {
Al Viro28407632012-08-17 23:54:15 -04001322 err = PTR_ERR(newfile1);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001323 goto out_put_unused_both;
Al Viro28407632012-08-17 23:54:15 -04001324 }
1325
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001326 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001327 if (IS_ERR(newfile2)) {
1328 err = PTR_ERR(newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001329 goto out_fput_1;
Al Virodb349502007-02-07 01:48:00 -05001330 }
1331
Yann Droneaudd73aa282013-12-09 22:42:20 +01001332 err = put_user(fd1, &usockvec[0]);
1333 if (err)
1334 goto out_fput_both;
1335
1336 err = put_user(fd2, &usockvec[1]);
1337 if (err)
1338 goto out_fput_both;
1339
Al Viro157cf642008-12-14 04:57:47 -05001340 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001341
Al Virodb349502007-02-07 01:48:00 -05001342 fd_install(fd1, newfile1);
1343 fd_install(fd2, newfile2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 /* fd1 and fd2 may be already another descriptors.
1345 * Not kernel problem.
1346 */
1347
Yann Droneaudd73aa282013-12-09 22:42:20 +01001348 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349
Yann Droneaudd73aa282013-12-09 22:42:20 +01001350out_fput_both:
1351 fput(newfile2);
1352 fput(newfile1);
1353 put_unused_fd(fd2);
1354 put_unused_fd(fd1);
1355 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356
Yann Droneaudd73aa282013-12-09 22:42:20 +01001357out_fput_1:
1358 fput(newfile1);
1359 put_unused_fd(fd2);
1360 put_unused_fd(fd1);
1361 sock_release(sock2);
1362 goto out;
1363
1364out_put_unused_both:
1365 put_unused_fd(fd2);
1366out_put_unused_1:
1367 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368out_release_both:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001369 sock_release(sock2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370out_release_1:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001371 sock_release(sock1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372out:
1373 return err;
1374}
1375
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376/*
1377 * Bind a name to a socket. Nothing much to do here since it's
1378 * the protocol's responsibility to handle the local address.
1379 *
1380 * We move the socket address to kernel space before we call
1381 * the protocol layer (having also checked the address is ok).
1382 */
1383
Heiko Carstens20f37032009-01-14 14:14:23 +01001384SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385{
1386 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001387 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001388 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001390 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001391 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001392 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001393 if (err >= 0) {
1394 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001395 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001396 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001397 if (!err)
1398 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001399 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001400 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001402 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001403 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404 return err;
1405}
1406
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407/*
1408 * Perform a listen. Basically, we allow the protocol to do anything
1409 * necessary for a listen, and if that works, we mark the socket as
1410 * ready for listening.
1411 */
1412
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001413SYSCALL_DEFINE2(listen, int, fd, int, backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414{
1415 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001416 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001417 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001418
1419 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1420 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001421 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001422 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001423 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
1425 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001426 if (!err)
1427 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001429 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 }
1431 return err;
1432}
1433
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434/*
1435 * For accept, we attempt to create a new socket, set up the link
1436 * with the client, wake up the client, then return the new
1437 * connected fd. We collect the address of the connector in kernel
1438 * space and move it to user at the very end. This is unclean because
1439 * we open the socket then return an error.
1440 *
1441 * 1003.1g adds the ability to recvmsg() to query connection pending
1442 * status to recvmsg. We need to add that support in a way thats
1443 * clean when we restucture accept also.
1444 */
1445
Heiko Carstens20f37032009-01-14 14:14:23 +01001446SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1447 int __user *, upeer_addrlen, int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448{
1449 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001450 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001451 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001452 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453
Ulrich Drepper77d27202008-07-23 21:29:35 -07001454 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001455 return -EINVAL;
1456
1457 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1458 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1459
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001460 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 if (!sock)
1462 goto out;
1463
1464 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001465 newsock = sock_alloc();
1466 if (!newsock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 goto out_put;
1468
1469 newsock->type = sock->type;
1470 newsock->ops = sock->ops;
1471
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 /*
1473 * We don't need try_module_get here, as the listening socket (sock)
1474 * has the protocol module (sock->ops->owner) held.
1475 */
1476 __module_get(newsock->ops->owner);
1477
Al Viro28407632012-08-17 23:54:15 -04001478 newfd = get_unused_fd_flags(flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001479 if (unlikely(newfd < 0)) {
1480 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001481 sock_release(newsock);
1482 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001483 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001484 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301485 if (IS_ERR(newfile)) {
Al Viro28407632012-08-17 23:54:15 -04001486 err = PTR_ERR(newfile);
1487 put_unused_fd(newfd);
1488 sock_release(newsock);
1489 goto out_put;
1490 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001491
Frank Filza79af592005-09-27 15:23:38 -07001492 err = security_socket_accept(sock, newsock);
1493 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001494 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001495
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1497 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001498 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499
1500 if (upeer_sockaddr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001501 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001502 &len, 2) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001504 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001506 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001507 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001509 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510 }
1511
1512 /* File flags are not inherited via accept() unlike another OSes. */
1513
David S. Miller39d8c1b2006-03-20 17:13:49 -08001514 fd_install(newfd, newfile);
1515 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001518 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519out:
1520 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001521out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001522 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001523 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524 goto out_put;
1525}
1526
Heiko Carstens20f37032009-01-14 14:14:23 +01001527SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1528 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001529{
Ulrich Drepperde11def2008-11-19 15:36:14 -08001530 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001531}
1532
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533/*
1534 * Attempt to connect to a socket with the server address. The address
1535 * is in user space so we verify it is OK and move it to kernel space.
1536 *
1537 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1538 * break bindings
1539 *
1540 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1541 * other SEQPACKET protocols that take time to connect() as it doesn't
1542 * include the -EINPROGRESS status for such sockets.
1543 */
1544
Heiko Carstens20f37032009-01-14 14:14:23 +01001545SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1546 int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547{
1548 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001549 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001550 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001552 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 if (!sock)
1554 goto out;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001555 err = move_addr_to_kernel(uservaddr, addrlen, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556 if (err < 0)
1557 goto out_put;
1558
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001559 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001560 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561 if (err)
1562 goto out_put;
1563
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001564 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 sock->file->f_flags);
1566out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001567 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568out:
1569 return err;
1570}
1571
1572/*
1573 * Get the local address ('name') of a socket object. Move the obtained
1574 * name to user space.
1575 */
1576
Heiko Carstens20f37032009-01-14 14:14:23 +01001577SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1578 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579{
1580 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001581 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001582 int len, err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001583
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001584 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 if (!sock)
1586 goto out;
1587
1588 err = security_socket_getsockname(sock);
1589 if (err)
1590 goto out_put;
1591
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001592 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593 if (err)
1594 goto out_put;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001595 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596
1597out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001598 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599out:
1600 return err;
1601}
1602
1603/*
1604 * Get the remote address ('name') of a socket object. Move the obtained
1605 * name to user space.
1606 */
1607
Heiko Carstens20f37032009-01-14 14:14:23 +01001608SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1609 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610{
1611 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001612 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001613 int len, err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001615 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1616 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 err = security_socket_getpeername(sock);
1618 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001619 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 return err;
1621 }
1622
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001623 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001624 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001625 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626 if (!err)
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001627 err = move_addr_to_user(&address, len, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001628 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001629 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 }
1631 return err;
1632}
1633
1634/*
1635 * Send a datagram to a given address. We move the address into kernel
1636 * space and check the user space data area is readable before invoking
1637 * the protocol.
1638 */
1639
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001640SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001641 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001642 int, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643{
1644 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001645 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 int err;
1647 struct msghdr msg;
1648 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001649 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001650
Yida Wang0bf43bd2017-03-22 18:16:31 -04001651 seemp_logk_sendto(fd, buff, len, flags, addr, addr_len);
1652
Al Viro602bd0e2015-03-21 19:12:32 -04001653 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
1654 if (unlikely(err))
1655 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001656 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1657 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001658 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001659
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001660 msg.msg_name = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001661 msg.msg_control = NULL;
1662 msg.msg_controllen = 0;
1663 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001664 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001665 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 if (err < 0)
1667 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001668 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001669 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 }
1671 if (sock->file->f_flags & O_NONBLOCK)
1672 flags |= MSG_DONTWAIT;
1673 msg.msg_flags = flags;
Al Virod8725c82014-12-11 00:02:50 -05001674 err = sock_sendmsg(sock, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001676out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001677 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001678out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 return err;
1680}
1681
1682/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001683 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 */
1685
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001686SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001687 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688{
1689 return sys_sendto(fd, buff, len, flags, NULL, 0);
1690}
1691
1692/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001693 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694 * sender. We verify the buffers are writable and if needed move the
1695 * sender address from kernel to user space.
1696 */
1697
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001698SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
Eric Dumazet95c96172012-04-15 05:58:06 +00001699 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001700 int __user *, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701{
1702 struct socket *sock;
1703 struct iovec iov;
1704 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001705 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001706 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001707 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708
Al Viro602bd0e2015-03-21 19:12:32 -04001709 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
1710 if (unlikely(err))
1711 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001712 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001714 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001716 msg.msg_control = NULL;
1717 msg.msg_controllen = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01001718 /* Save some cycles and don't copy the address if not needed */
1719 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1720 /* We assume all kernel code knows the size of sockaddr_storage */
1721 msg.msg_namelen = 0;
tadeusz.struk@intel.com130ed5d2015-12-15 10:46:17 -08001722 msg.msg_iocb = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 if (sock->file->f_flags & O_NONBLOCK)
1724 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04001725 err = sock_recvmsg(sock, &msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001727 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001728 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001729 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001730 if (err2 < 0)
1731 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001733
1734 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001735out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736 return err;
1737}
1738
1739/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001740 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741 */
1742
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02001743SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1744 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745{
1746 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1747}
1748
1749/*
1750 * Set a socket option. Because we don't know the option lengths we have
1751 * to pass the user mode parameter for the protocols to sort out.
1752 */
1753
Heiko Carstens20f37032009-01-14 14:14:23 +01001754SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1755 char __user *, optval, int, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001757 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758 struct socket *sock;
1759
1760 if (optlen < 0)
1761 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001762
1763 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1764 if (sock != NULL) {
1765 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001766 if (err)
1767 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768
1769 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001770 err =
1771 sock_setsockopt(sock, level, optname, optval,
1772 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001774 err =
1775 sock->ops->setsockopt(sock, level, optname, optval,
1776 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001777out_put:
1778 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001779 }
1780 return err;
1781}
1782
1783/*
1784 * Get a socket option. Because we don't know the option lengths we have
1785 * to pass a user mode parameter for the protocols to sort out.
1786 */
1787
Heiko Carstens20f37032009-01-14 14:14:23 +01001788SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1789 char __user *, optval, int __user *, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001790{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001791 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792 struct socket *sock;
1793
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001794 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1795 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001796 err = security_socket_getsockopt(sock, level, optname);
1797 if (err)
1798 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799
1800 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001801 err =
1802 sock_getsockopt(sock, level, optname, optval,
1803 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001805 err =
1806 sock->ops->getsockopt(sock, level, optname, optval,
1807 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001808out_put:
1809 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810 }
1811 return err;
1812}
1813
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814/*
1815 * Shutdown a socket.
1816 */
1817
Heiko Carstens754fe8d2009-01-14 14:14:09 +01001818SYSCALL_DEFINE2(shutdown, int, fd, int, how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001820 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821 struct socket *sock;
1822
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001823 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1824 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001826 if (!err)
1827 err = sock->ops->shutdown(sock, how);
1828 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829 }
1830 return err;
1831}
1832
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001833/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834 * fields which are the same type (int / unsigned) on our platforms.
1835 */
1836#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1837#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1838#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1839
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001840struct used_address {
1841 struct sockaddr_storage name;
1842 unsigned int name_len;
1843};
1844
Al Viroda184282015-03-21 19:29:06 -04001845static int copy_msghdr_from_user(struct msghdr *kmsg,
1846 struct user_msghdr __user *umsg,
1847 struct sockaddr __user **save_addr,
1848 struct iovec **iov)
Dan Carpenter1661bf32013-10-03 00:27:20 +03001849{
Al Viro08adb7d2014-11-10 20:23:13 -05001850 struct sockaddr __user *uaddr;
1851 struct iovec __user *uiov;
Al Viroc0371da2014-11-24 10:42:55 -05001852 size_t nr_segs;
Al Viro08adb7d2014-11-10 20:23:13 -05001853 ssize_t err;
1854
1855 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
1856 __get_user(uaddr, &umsg->msg_name) ||
1857 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
1858 __get_user(uiov, &umsg->msg_iov) ||
Al Viroc0371da2014-11-24 10:42:55 -05001859 __get_user(nr_segs, &umsg->msg_iovlen) ||
Al Viro08adb7d2014-11-10 20:23:13 -05001860 __get_user(kmsg->msg_control, &umsg->msg_control) ||
1861 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
1862 __get_user(kmsg->msg_flags, &umsg->msg_flags))
Dan Carpenter1661bf32013-10-03 00:27:20 +03001863 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00001864
Al Viro08adb7d2014-11-10 20:23:13 -05001865 if (!uaddr)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07001866 kmsg->msg_namelen = 0;
1867
Matthew Leachdbb490b2014-03-11 11:58:27 +00001868 if (kmsg->msg_namelen < 0)
1869 return -EINVAL;
1870
Dan Carpenter1661bf32013-10-03 00:27:20 +03001871 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03001872 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05001873
1874 if (save_addr)
1875 *save_addr = uaddr;
1876
1877 if (uaddr && kmsg->msg_namelen) {
1878 if (!save_addr) {
1879 err = move_addr_to_kernel(uaddr, kmsg->msg_namelen,
1880 kmsg->msg_name);
1881 if (err < 0)
1882 return err;
1883 }
1884 } else {
1885 kmsg->msg_name = NULL;
1886 kmsg->msg_namelen = 0;
1887 }
1888
Al Viroc0371da2014-11-24 10:42:55 -05001889 if (nr_segs > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05001890 return -EMSGSIZE;
1891
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07001892 kmsg->msg_iocb = NULL;
1893
Al Viroda184282015-03-21 19:29:06 -04001894 return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs,
1895 UIO_FASTIOV, iov, &kmsg->msg_iter);
Dan Carpenter1661bf32013-10-03 00:27:20 +03001896}
1897
Al Viro666547f2014-04-06 14:03:05 -04001898static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00001899 struct msghdr *msg_sys, unsigned int flags,
Tom Herbert28a94d82016-03-07 14:11:02 -08001900 struct used_address *used_address,
1901 unsigned int allowed_msghdr_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001903 struct compat_msghdr __user *msg_compat =
1904 (struct compat_msghdr __user *)msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001905 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07001907 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001908 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1909 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910 unsigned char *ctl_buf = ctl;
Al Virod8725c82014-12-11 00:02:50 -05001911 int ctl_len;
Al Viro08adb7d2014-11-10 20:23:13 -05001912 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001913
Al Viro08adb7d2014-11-10 20:23:13 -05001914 msg_sys->msg_name = &address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915
Al Viro08449322014-11-09 22:33:45 -05001916 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05001917 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
Al Viro08449322014-11-09 22:33:45 -05001918 else
Al Viro08adb7d2014-11-10 20:23:13 -05001919 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001920 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04001921 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922
1923 err = -ENOBUFS;
1924
Anton Blanchard228e5482011-05-02 20:21:35 +00001925 if (msg_sys->msg_controllen > INT_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 goto out_freeiov;
Tom Herbert28a94d82016-03-07 14:11:02 -08001927 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
Anton Blanchard228e5482011-05-02 20:21:35 +00001928 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001930 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00001931 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001932 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933 if (err)
1934 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00001935 ctl_buf = msg_sys->msg_control;
1936 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937 } else if (ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001938 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001940 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941 goto out_freeiov;
1942 }
1943 err = -EFAULT;
1944 /*
Anton Blanchard228e5482011-05-02 20:21:35 +00001945 * Careful! Before this, msg_sys->msg_control contains a user pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1947 * checking falls down on this.
1948 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00001949 if (copy_from_user(ctl_buf,
Anton Blanchard228e5482011-05-02 20:21:35 +00001950 (void __user __force *)msg_sys->msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001951 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00001953 msg_sys->msg_control = ctl_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954 }
Anton Blanchard228e5482011-05-02 20:21:35 +00001955 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956
1957 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00001958 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001959 /*
1960 * If this is sendmmsg() and current destination address is same as
1961 * previously succeeded address, omit asking LSM's decision.
1962 * used_address->name_len is initialized to UINT_MAX so that the first
1963 * destination address never matches.
1964 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07001965 if (used_address && msg_sys->msg_name &&
1966 used_address->name_len == msg_sys->msg_namelen &&
1967 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001968 used_address->name_len)) {
Al Virod8725c82014-12-11 00:02:50 -05001969 err = sock_sendmsg_nosec(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001970 goto out_freectl;
1971 }
Al Virod8725c82014-12-11 00:02:50 -05001972 err = sock_sendmsg(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001973 /*
1974 * If this is sendmmsg() and sending to current destination address was
1975 * successful, remember it.
1976 */
1977 if (used_address && err >= 0) {
1978 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07001979 if (msg_sys->msg_name)
1980 memcpy(&used_address->name, msg_sys->msg_name,
1981 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001982 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983
1984out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001985 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001986 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1987out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04001988 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00001989 return err;
1990}
1991
1992/*
1993 * BSD sendmsg interface
1994 */
1995
Al Viro666547f2014-04-06 14:03:05 -04001996long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
Anton Blanchard228e5482011-05-02 20:21:35 +00001997{
1998 int fput_needed, err;
1999 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002000 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00002001
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002002 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00002003 if (!sock)
2004 goto out;
2005
Tom Herbert28a94d82016-03-07 14:11:02 -08002006 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
Anton Blanchard228e5482011-05-02 20:21:35 +00002007
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002008 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002009out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010 return err;
2011}
2012
Al Viro666547f2014-04-06 14:03:05 -04002013SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002014{
2015 if (flags & MSG_CMSG_COMPAT)
2016 return -EINVAL;
2017 return __sys_sendmsg(fd, msg, flags);
2018}
2019
Anton Blanchard228e5482011-05-02 20:21:35 +00002020/*
2021 * Linux sendmmsg interface
2022 */
2023
2024int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2025 unsigned int flags)
2026{
2027 int fput_needed, err, datagrams;
2028 struct socket *sock;
2029 struct mmsghdr __user *entry;
2030 struct compat_mmsghdr __user *compat_entry;
2031 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002032 struct used_address used_address;
Tom Herbertf0922762016-03-07 14:11:03 -08002033 unsigned int oflags = flags;
Anton Blanchard228e5482011-05-02 20:21:35 +00002034
Anton Blanchard98382f42011-08-04 14:07:39 +00002035 if (vlen > UIO_MAXIOV)
2036 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002037
2038 datagrams = 0;
2039
2040 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2041 if (!sock)
2042 return err;
2043
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002044 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002045 entry = mmsg;
2046 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002047 err = 0;
Tom Herbertf0922762016-03-07 14:11:03 -08002048 flags |= MSG_BATCH;
Anton Blanchard228e5482011-05-02 20:21:35 +00002049
2050 while (datagrams < vlen) {
Tom Herbertf0922762016-03-07 14:11:03 -08002051 if (datagrams == vlen - 1)
2052 flags = oflags;
2053
Anton Blanchard228e5482011-05-02 20:21:35 +00002054 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002055 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002056 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002057 if (err < 0)
2058 break;
2059 err = __put_user(err, &compat_entry->msg_len);
2060 ++compat_entry;
2061 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002062 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002063 (struct user_msghdr __user *)entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002064 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002065 if (err < 0)
2066 break;
2067 err = put_user(err, &entry->msg_len);
2068 ++entry;
2069 }
2070
2071 if (err)
2072 break;
2073 ++datagrams;
Soheil Hassas Yeganeh30238982016-11-04 15:36:49 -04002074 if (msg_data_left(&msg_sys))
2075 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002076 cond_resched();
Anton Blanchard228e5482011-05-02 20:21:35 +00002077 }
2078
Anton Blanchard228e5482011-05-02 20:21:35 +00002079 fput_light(sock->file, fput_needed);
2080
Anton Blanchard728ffb82011-08-04 14:07:38 +00002081 /* We only return an error if no datagrams were able to be sent */
2082 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002083 return datagrams;
2084
Anton Blanchard228e5482011-05-02 20:21:35 +00002085 return err;
2086}
2087
2088SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2089 unsigned int, vlen, unsigned int, flags)
2090{
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002091 if (flags & MSG_CMSG_COMPAT)
2092 return -EINVAL;
Anton Blanchard228e5482011-05-02 20:21:35 +00002093 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2094}
2095
Al Viro666547f2014-04-06 14:03:05 -04002096static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002097 struct msghdr *msg_sys, unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002099 struct compat_msghdr __user *msg_compat =
2100 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002102 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103 unsigned long cmsg_ptr;
Al Viro2da62902015-03-14 21:13:46 -04002104 int len;
Al Viro08adb7d2014-11-10 20:23:13 -05002105 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002106
2107 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002108 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109
2110 /* user mode address pointers */
2111 struct sockaddr __user *uaddr;
Al Viro08adb7d2014-11-10 20:23:13 -05002112 int __user *uaddr_len = COMPAT_NAMELEN(msg);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002113
Al Viro08adb7d2014-11-10 20:23:13 -05002114 msg_sys->msg_name = &addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002116 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002117 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002118 else
Al Viro08adb7d2014-11-10 20:23:13 -05002119 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002120 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04002121 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002122
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002123 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2124 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002125
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002126 /* We assume all kernel code knows the size of sockaddr_storage */
2127 msg_sys->msg_namelen = 0;
2128
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129 if (sock->file->f_flags & O_NONBLOCK)
2130 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002131 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002132 if (err < 0)
2133 goto out_freeiov;
2134 len = err;
2135
2136 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002137 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002138 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002139 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140 if (err < 0)
2141 goto out_freeiov;
2142 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002143 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002144 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145 if (err)
2146 goto out_freeiov;
2147 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002148 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149 &msg_compat->msg_controllen);
2150 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002151 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002152 &msg->msg_controllen);
2153 if (err)
2154 goto out_freeiov;
2155 err = len;
2156
2157out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04002158 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002159 return err;
2160}
2161
2162/*
2163 * BSD recvmsg interface
2164 */
2165
Al Viro666547f2014-04-06 14:03:05 -04002166long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002167{
2168 int fput_needed, err;
2169 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002170 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002171
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002172 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002173 if (!sock)
2174 goto out;
2175
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002176 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002177
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002178 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179out:
2180 return err;
2181}
2182
Al Viro666547f2014-04-06 14:03:05 -04002183SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002184 unsigned int, flags)
2185{
2186 if (flags & MSG_CMSG_COMPAT)
2187 return -EINVAL;
2188 return __sys_recvmsg(fd, msg, flags);
2189}
2190
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002191/*
2192 * Linux recvmmsg interface
2193 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002195int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2196 unsigned int flags, struct timespec *timeout)
2197{
2198 int fput_needed, err, datagrams;
2199 struct socket *sock;
2200 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002201 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002202 struct msghdr msg_sys;
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002203 struct timespec64 end_time;
2204 struct timespec64 timeout64;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002205
2206 if (timeout &&
2207 poll_select_set_timeout(&end_time, timeout->tv_sec,
2208 timeout->tv_nsec))
2209 return -EINVAL;
2210
2211 datagrams = 0;
2212
2213 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2214 if (!sock)
2215 return err;
2216
2217 err = sock_error(sock->sk);
Maxime Jayat1a0e2592017-02-21 18:35:51 +01002218 if (err) {
2219 datagrams = err;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002220 goto out_put;
Maxime Jayat1a0e2592017-02-21 18:35:51 +01002221 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002222
2223 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002224 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002225
2226 while (datagrams < vlen) {
2227 /*
2228 * No need to ask LSM for more than the first datagram.
2229 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002230 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002231 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002232 &msg_sys, flags & ~MSG_WAITFORONE,
2233 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002234 if (err < 0)
2235 break;
2236 err = __put_user(err, &compat_entry->msg_len);
2237 ++compat_entry;
2238 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002239 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002240 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002241 &msg_sys, flags & ~MSG_WAITFORONE,
2242 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002243 if (err < 0)
2244 break;
2245 err = put_user(err, &entry->msg_len);
2246 ++entry;
2247 }
2248
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002249 if (err)
2250 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002251 ++datagrams;
2252
Brandon L Black71c5c152010-03-26 16:18:03 +00002253 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2254 if (flags & MSG_WAITFORONE)
2255 flags |= MSG_DONTWAIT;
2256
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002257 if (timeout) {
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002258 ktime_get_ts64(&timeout64);
2259 *timeout = timespec64_to_timespec(
2260 timespec64_sub(end_time, timeout64));
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002261 if (timeout->tv_sec < 0) {
2262 timeout->tv_sec = timeout->tv_nsec = 0;
2263 break;
2264 }
2265
2266 /* Timeout, return less than vlen datagrams */
2267 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2268 break;
2269 }
2270
2271 /* Out of band data, return right away */
2272 if (msg_sys.msg_flags & MSG_OOB)
2273 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002274 cond_resched();
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002275 }
2276
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002277 if (err == 0)
2278 goto out_put;
2279
2280 if (datagrams == 0) {
2281 datagrams = err;
2282 goto out_put;
2283 }
2284
2285 /*
2286 * We may return less entries than requested (vlen) if the
2287 * sock is non block and there aren't enough datagrams...
2288 */
2289 if (err != -EAGAIN) {
2290 /*
2291 * ... or if recvmsg returns an error after we
2292 * received some datagrams, where we record the
2293 * error to return on the next call or if the
2294 * app asks about it using getsockopt(SO_ERROR).
2295 */
2296 sock->sk->sk_err = -err;
2297 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002298out_put:
2299 fput_light(sock->file, fput_needed);
2300
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002301 return datagrams;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002302}
2303
2304SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2305 unsigned int, vlen, unsigned int, flags,
2306 struct timespec __user *, timeout)
2307{
2308 int datagrams;
2309 struct timespec timeout_sys;
2310
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002311 if (flags & MSG_CMSG_COMPAT)
2312 return -EINVAL;
2313
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002314 if (!timeout)
2315 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2316
2317 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2318 return -EFAULT;
2319
2320 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2321
2322 if (datagrams > 0 &&
2323 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2324 datagrams = -EFAULT;
2325
2326 return datagrams;
2327}
2328
2329#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002330/* Argument list sizes for sys_socketcall */
2331#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002332static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002333 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2334 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2335 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002336 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002337};
2338
Linus Torvalds1da177e2005-04-16 15:20:36 -07002339#undef AL
2340
2341/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002342 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343 *
2344 * Argument checking cleaned up. Saved 20% in size.
2345 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002346 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002347 */
2348
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002349SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002350{
Chen Gang2950fa92013-04-07 16:55:23 +08002351 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002352 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002353 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002354 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355
Anton Blanchard228e5482011-05-02 20:21:35 +00002356 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002357 return -EINVAL;
2358
Arjan van de Ven47379052009-09-28 12:57:44 -07002359 len = nargs[call];
2360 if (len > sizeof(a))
2361 return -EINVAL;
2362
Linus Torvalds1da177e2005-04-16 15:20:36 -07002363 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002364 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002365 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002366
Chen Gang2950fa92013-04-07 16:55:23 +08002367 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2368 if (err)
2369 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002370
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002371 a0 = a[0];
2372 a1 = a[1];
2373
2374 switch (call) {
2375 case SYS_SOCKET:
2376 err = sys_socket(a0, a1, a[2]);
2377 break;
2378 case SYS_BIND:
2379 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2380 break;
2381 case SYS_CONNECT:
2382 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2383 break;
2384 case SYS_LISTEN:
2385 err = sys_listen(a0, a1);
2386 break;
2387 case SYS_ACCEPT:
Ulrich Drepperde11def2008-11-19 15:36:14 -08002388 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2389 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002390 break;
2391 case SYS_GETSOCKNAME:
2392 err =
2393 sys_getsockname(a0, (struct sockaddr __user *)a1,
2394 (int __user *)a[2]);
2395 break;
2396 case SYS_GETPEERNAME:
2397 err =
2398 sys_getpeername(a0, (struct sockaddr __user *)a1,
2399 (int __user *)a[2]);
2400 break;
2401 case SYS_SOCKETPAIR:
2402 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2403 break;
2404 case SYS_SEND:
2405 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2406 break;
2407 case SYS_SENDTO:
2408 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2409 (struct sockaddr __user *)a[4], a[5]);
2410 break;
2411 case SYS_RECV:
2412 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2413 break;
2414 case SYS_RECVFROM:
2415 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2416 (struct sockaddr __user *)a[4],
2417 (int __user *)a[5]);
2418 break;
2419 case SYS_SHUTDOWN:
2420 err = sys_shutdown(a0, a1);
2421 break;
2422 case SYS_SETSOCKOPT:
2423 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2424 break;
2425 case SYS_GETSOCKOPT:
2426 err =
2427 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2428 (int __user *)a[4]);
2429 break;
2430 case SYS_SENDMSG:
Al Viro666547f2014-04-06 14:03:05 -04002431 err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002432 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002433 case SYS_SENDMMSG:
2434 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2435 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002436 case SYS_RECVMSG:
Al Viro666547f2014-04-06 14:03:05 -04002437 err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002438 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002439 case SYS_RECVMMSG:
2440 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2441 (struct timespec __user *)a[4]);
2442 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002443 case SYS_ACCEPT4:
2444 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2445 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002446 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002447 default:
2448 err = -EINVAL;
2449 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002450 }
2451 return err;
2452}
2453
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002454#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002455
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002456/**
2457 * sock_register - add a socket protocol handler
2458 * @ops: description of protocol
2459 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002460 * This function is called by a protocol handler that wants to
2461 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09002462 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002463 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002464 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002465int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002466{
2467 int err;
2468
2469 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08002470 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002471 return -ENOBUFS;
2472 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002473
2474 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002475 if (rcu_dereference_protected(net_families[ops->family],
2476 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002477 err = -EEXIST;
2478 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00002479 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002480 err = 0;
2481 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002482 spin_unlock(&net_family_lock);
2483
Yang Yingliang3410f222014-02-12 17:09:55 +08002484 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002485 return err;
2486}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002487EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002488
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002489/**
2490 * sock_unregister - remove a protocol handler
2491 * @family: protocol family to remove
2492 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002493 * This function is called by a protocol handler that wants to
2494 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002495 * new socket creation.
2496 *
2497 * If protocol handler is a module, then it can use module reference
2498 * counts to protect against new references. If protocol handler is not
2499 * a module then it needs to provide its own protection in
2500 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002501 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002502void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002504 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002505
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002506 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00002507 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002508 spin_unlock(&net_family_lock);
2509
2510 synchronize_rcu();
2511
Yang Yingliang3410f222014-02-12 17:09:55 +08002512 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002513}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002514EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515
Andi Kleen77d76ea2005-12-22 12:43:42 -08002516static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002517{
Nick Pigginb3e19d92011-01-07 17:50:11 +11002518 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00002519 /*
2520 * Initialize the network sysctl infrastructure.
2521 */
2522 err = net_sysctl_init();
2523 if (err)
2524 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11002525
Linus Torvalds1da177e2005-04-16 15:20:36 -07002526 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002527 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002528 */
2529 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002530
2531 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002532 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002533 */
2534
2535 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11002536
2537 err = register_filesystem(&sock_fs_type);
2538 if (err)
2539 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002540 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11002541 if (IS_ERR(sock_mnt)) {
2542 err = PTR_ERR(sock_mnt);
2543 goto out_mount;
2544 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08002545
2546 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002547 */
2548
2549#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00002550 err = netfilter_init();
2551 if (err)
2552 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002553#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002554
Daniel Borkmann408eccc2014-04-01 16:20:23 +02002555 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00002556
Nick Pigginb3e19d92011-01-07 17:50:11 +11002557out:
2558 return err;
2559
2560out_mount:
2561 unregister_filesystem(&sock_fs_type);
2562out_fs:
2563 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002564}
2565
Andi Kleen77d76ea2005-12-22 12:43:42 -08002566core_initcall(sock_init); /* early initcall */
2567
Linus Torvalds1da177e2005-04-16 15:20:36 -07002568#ifdef CONFIG_PROC_FS
2569void socket_seq_show(struct seq_file *seq)
2570{
2571 int cpu;
2572 int counter = 0;
2573
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07002574 for_each_possible_cpu(cpu)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002575 counter += per_cpu(sockets_in_use, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002576
2577 /* It can be negative, by the way. 8) */
2578 if (counter < 0)
2579 counter = 0;
2580
2581 seq_printf(seq, "sockets: used %d\n", counter);
2582}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002583#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002584
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002585#ifdef CONFIG_COMPAT
Arnd Bergmann6b960182009-11-06 23:10:54 -08002586static int do_siocgstamp(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002587 unsigned int cmd, void __user *up)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002588{
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002589 mm_segment_t old_fs = get_fs();
2590 struct timeval ktv;
2591 int err;
2592
2593 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002594 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002595 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002596 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002597 err = compat_put_timeval(&ktv, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002598
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002599 return err;
2600}
2601
Arnd Bergmann6b960182009-11-06 23:10:54 -08002602static int do_siocgstampns(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002603 unsigned int cmd, void __user *up)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002604{
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002605 mm_segment_t old_fs = get_fs();
2606 struct timespec kts;
2607 int err;
2608
2609 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002610 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002611 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002612 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002613 err = compat_put_timespec(&kts, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002614
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002615 return err;
2616}
2617
Arnd Bergmann6b960182009-11-06 23:10:54 -08002618static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002619{
2620 struct ifreq __user *uifr;
2621 int err;
2622
2623 uifr = compat_alloc_user_space(sizeof(struct ifreq));
Arnd Bergmann6b960182009-11-06 23:10:54 -08002624 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002625 return -EFAULT;
2626
Arnd Bergmann6b960182009-11-06 23:10:54 -08002627 err = dev_ioctl(net, SIOCGIFNAME, uifr);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002628 if (err)
2629 return err;
2630
Arnd Bergmann6b960182009-11-06 23:10:54 -08002631 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002632 return -EFAULT;
2633
2634 return 0;
2635}
2636
Arnd Bergmann6b960182009-11-06 23:10:54 -08002637static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002638{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002639 struct compat_ifconf ifc32;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002640 struct ifconf ifc;
2641 struct ifconf __user *uifc;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002642 struct compat_ifreq __user *ifr32;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002643 struct ifreq __user *ifr;
2644 unsigned int i, j;
2645 int err;
2646
Arnd Bergmann6b960182009-11-06 23:10:54 -08002647 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002648 return -EFAULT;
2649
Mathias Krause43da5f22012-08-15 11:31:57 +00002650 memset(&ifc, 0, sizeof(ifc));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002651 if (ifc32.ifcbuf == 0) {
2652 ifc32.ifc_len = 0;
2653 ifc.ifc_len = 0;
2654 ifc.ifc_req = NULL;
2655 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2656 } else {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002657 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2658 sizeof(struct ifreq);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002659 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2660 ifc.ifc_len = len;
2661 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2662 ifr32 = compat_ptr(ifc32.ifcbuf);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002663 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
Arnd Bergmann6b960182009-11-06 23:10:54 -08002664 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002665 return -EFAULT;
2666 ifr++;
2667 ifr32++;
2668 }
2669 }
2670 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2671 return -EFAULT;
2672
Arnd Bergmann6b960182009-11-06 23:10:54 -08002673 err = dev_ioctl(net, SIOCGIFCONF, uifc);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002674 if (err)
2675 return err;
2676
2677 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2678 return -EFAULT;
2679
2680 ifr = ifc.ifc_req;
2681 ifr32 = compat_ptr(ifc32.ifcbuf);
2682 for (i = 0, j = 0;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002683 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2684 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2685 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002686 return -EFAULT;
2687 ifr32++;
2688 ifr++;
2689 }
2690
2691 if (ifc32.ifcbuf == 0) {
2692 /* Translate from 64-bit structure multiple to
2693 * a 32-bit one.
2694 */
2695 i = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002696 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002697 ifc32.ifc_len = i;
2698 } else {
2699 ifc32.ifc_len = i;
2700 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08002701 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002702 return -EFAULT;
2703
2704 return 0;
2705}
2706
Arnd Bergmann6b960182009-11-06 23:10:54 -08002707static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002708{
Ben Hutchings3a7da392011-03-17 07:34:32 +00002709 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2710 bool convert_in = false, convert_out = false;
2711 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2712 struct ethtool_rxnfc __user *rxnfc;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002713 struct ifreq __user *ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002714 u32 rule_cnt = 0, actual_rule_cnt;
2715 u32 ethcmd;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002716 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002717 int ret;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002718
2719 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2720 return -EFAULT;
2721
Ben Hutchings3a7da392011-03-17 07:34:32 +00002722 compat_rxnfc = compat_ptr(data);
2723
2724 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002725 return -EFAULT;
2726
Ben Hutchings3a7da392011-03-17 07:34:32 +00002727 /* Most ethtool structures are defined without padding.
2728 * Unfortunately struct ethtool_rxnfc is an exception.
2729 */
2730 switch (ethcmd) {
2731 default:
2732 break;
2733 case ETHTOOL_GRXCLSRLALL:
2734 /* Buffer size is variable */
2735 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2736 return -EFAULT;
2737 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2738 return -ENOMEM;
2739 buf_size += rule_cnt * sizeof(u32);
2740 /* fall through */
2741 case ETHTOOL_GRXRINGS:
2742 case ETHTOOL_GRXCLSRLCNT:
2743 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00002744 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002745 convert_out = true;
2746 /* fall through */
2747 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002748 buf_size += sizeof(struct ethtool_rxnfc);
2749 convert_in = true;
2750 break;
2751 }
2752
2753 ifr = compat_alloc_user_space(buf_size);
Stephen Hemminger954b1242013-02-11 06:22:28 +00002754 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
Ben Hutchings3a7da392011-03-17 07:34:32 +00002755
2756 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2757 return -EFAULT;
2758
2759 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2760 &ifr->ifr_ifru.ifru_data))
2761 return -EFAULT;
2762
2763 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00002764 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00002765 * fs.ring_cookie and at the end of fs, but nowhere else.
2766 */
Alexander Duyck127fe532011-04-08 18:01:59 +00002767 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2768 sizeof(compat_rxnfc->fs.m_ext) !=
2769 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2770 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00002771 BUILD_BUG_ON(
2772 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2773 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2774 offsetof(struct ethtool_rxnfc, fs.location) -
2775 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2776
2777 if (copy_in_user(rxnfc, compat_rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002778 (void __user *)(&rxnfc->fs.m_ext + 1) -
2779 (void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002780 copy_in_user(&rxnfc->fs.ring_cookie,
2781 &compat_rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002782 (void __user *)(&rxnfc->fs.location + 1) -
2783 (void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002784 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2785 sizeof(rxnfc->rule_cnt)))
2786 return -EFAULT;
2787 }
2788
2789 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2790 if (ret)
2791 return ret;
2792
2793 if (convert_out) {
2794 if (copy_in_user(compat_rxnfc, rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002795 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2796 (const void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002797 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2798 &rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002799 (const void __user *)(&rxnfc->fs.location + 1) -
2800 (const void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002801 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2802 sizeof(rxnfc->rule_cnt)))
2803 return -EFAULT;
2804
2805 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2806 /* As an optimisation, we only copy the actual
2807 * number of rules that the underlying
2808 * function returned. Since Mallory might
2809 * change the rule count in user memory, we
2810 * check that it is less than the rule count
2811 * originally given (as the user buffer size),
2812 * which has been range-checked.
2813 */
2814 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2815 return -EFAULT;
2816 if (actual_rule_cnt < rule_cnt)
2817 rule_cnt = actual_rule_cnt;
2818 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2819 &rxnfc->rule_locs[0],
2820 rule_cnt * sizeof(u32)))
2821 return -EFAULT;
2822 }
2823 }
2824
2825 return 0;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002826}
2827
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002828static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2829{
2830 void __user *uptr;
2831 compat_uptr_t uptr32;
2832 struct ifreq __user *uifr;
2833
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002834 uifr = compat_alloc_user_space(sizeof(*uifr));
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002835 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2836 return -EFAULT;
2837
2838 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2839 return -EFAULT;
2840
2841 uptr = compat_ptr(uptr32);
2842
2843 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2844 return -EFAULT;
2845
2846 return dev_ioctl(net, SIOCWANDEV, uifr);
2847}
2848
Arnd Bergmann6b960182009-11-06 23:10:54 -08002849static int bond_ioctl(struct net *net, unsigned int cmd,
2850 struct compat_ifreq __user *ifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002851{
2852 struct ifreq kifr;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002853 mm_segment_t old_fs;
2854 int err;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002855
2856 switch (cmd) {
2857 case SIOCBONDENSLAVE:
2858 case SIOCBONDRELEASE:
2859 case SIOCBONDSETHWADDR:
2860 case SIOCBONDCHANGEACTIVE:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002861 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002862 return -EFAULT;
2863
2864 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002865 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002866 err = dev_ioctl(net, cmd,
2867 (struct ifreq __user __force *) &kifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002868 set_fs(old_fs);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002869
2870 return err;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002871 default:
Linus Torvalds07d106d2012-01-05 15:40:12 -08002872 return -ENOIOCTLCMD;
Joe Perchesccbd6a52010-05-14 10:58:26 +00002873 }
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002874}
2875
Ben Hutchings590d4692013-11-18 17:04:13 +00002876/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
2877static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08002878 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002879{
2880 struct ifreq __user *u_ifreq64;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002881 char tmp_buf[IFNAMSIZ];
2882 void __user *data64;
2883 u32 data32;
2884
2885 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
2886 IFNAMSIZ))
2887 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00002888 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002889 return -EFAULT;
2890 data64 = compat_ptr(data32);
2891
2892 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
2893
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002894 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
2895 IFNAMSIZ))
2896 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00002897 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002898 return -EFAULT;
2899
Arnd Bergmann6b960182009-11-06 23:10:54 -08002900 return dev_ioctl(net, cmd, u_ifreq64);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002901}
2902
Arnd Bergmann6b960182009-11-06 23:10:54 -08002903static int dev_ifsioc(struct net *net, struct socket *sock,
2904 unsigned int cmd, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002905{
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002906 struct ifreq __user *uifr;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002907 int err;
2908
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002909 uifr = compat_alloc_user_space(sizeof(*uifr));
2910 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
2911 return -EFAULT;
2912
2913 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
2914
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002915 if (!err) {
2916 switch (cmd) {
2917 case SIOCGIFFLAGS:
2918 case SIOCGIFMETRIC:
2919 case SIOCGIFMTU:
2920 case SIOCGIFMEM:
2921 case SIOCGIFHWADDR:
2922 case SIOCGIFINDEX:
2923 case SIOCGIFADDR:
2924 case SIOCGIFBRDADDR:
2925 case SIOCGIFDSTADDR:
2926 case SIOCGIFNETMASK:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002927 case SIOCGIFPFLAGS:
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002928 case SIOCGIFTXQLEN:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002929 case SIOCGMIIPHY:
2930 case SIOCGMIIREG:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002931 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002932 err = -EFAULT;
2933 break;
2934 }
2935 }
2936 return err;
2937}
2938
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002939static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2940 struct compat_ifreq __user *uifr32)
2941{
2942 struct ifreq ifr;
2943 struct compat_ifmap __user *uifmap32;
2944 mm_segment_t old_fs;
2945 int err;
2946
2947 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2948 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002949 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2950 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2951 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2952 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
2953 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
2954 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002955 if (err)
2956 return -EFAULT;
2957
2958 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002959 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002960 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002961 set_fs(old_fs);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002962
2963 if (cmd == SIOCGIFMAP && !err) {
2964 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002965 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2966 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2967 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2968 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
2969 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
2970 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002971 if (err)
2972 err = -EFAULT;
2973 }
2974 return err;
2975}
2976
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002977struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002978 u32 rt_pad1;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002979 struct sockaddr rt_dst; /* target address */
2980 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
2981 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002982 unsigned short rt_flags;
2983 short rt_pad2;
2984 u32 rt_pad3;
2985 unsigned char rt_tos;
2986 unsigned char rt_class;
2987 short rt_pad4;
2988 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002989 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002990 u32 rt_mtu; /* per route MTU/Window */
2991 u32 rt_window; /* Window clamping */
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002992 unsigned short rt_irtt; /* Initial RTT */
2993};
2994
2995struct in6_rtmsg32 {
2996 struct in6_addr rtmsg_dst;
2997 struct in6_addr rtmsg_src;
2998 struct in6_addr rtmsg_gateway;
2999 u32 rtmsg_type;
3000 u16 rtmsg_dst_len;
3001 u16 rtmsg_src_len;
3002 u32 rtmsg_metric;
3003 u32 rtmsg_info;
3004 u32 rtmsg_flags;
3005 s32 rtmsg_ifindex;
3006};
3007
Arnd Bergmann6b960182009-11-06 23:10:54 -08003008static int routing_ioctl(struct net *net, struct socket *sock,
3009 unsigned int cmd, void __user *argp)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003010{
3011 int ret;
3012 void *r = NULL;
3013 struct in6_rtmsg r6;
3014 struct rtentry r4;
3015 char devname[16];
3016 u32 rtdev;
3017 mm_segment_t old_fs = get_fs();
3018
Arnd Bergmann6b960182009-11-06 23:10:54 -08003019 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3020 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003021 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003022 3 * sizeof(struct in6_addr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003023 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3024 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3025 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3026 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3027 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3028 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3029 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003030
3031 r = (void *) &r6;
3032 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003033 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003034 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003035 3 * sizeof(struct sockaddr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003036 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3037 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3038 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3039 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3040 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3041 ret |= get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003042 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003043 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003044 r4.rt_dev = (char __user __force *)devname;
3045 devname[15] = 0;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003046 } else
3047 r4.rt_dev = NULL;
3048
3049 r = (void *) &r4;
3050 }
3051
3052 if (ret) {
3053 ret = -EFAULT;
3054 goto out;
3055 }
3056
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003057 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003058 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003059 set_fs(old_fs);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003060
3061out:
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003062 return ret;
3063}
3064
3065/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3066 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003067 * use compatible ioctls
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003068 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003069static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003070{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003071 compat_ulong_t tmp;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003072
Arnd Bergmann6b960182009-11-06 23:10:54 -08003073 if (get_user(tmp, argp))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003074 return -EFAULT;
3075 if (tmp == BRCTL_GET_VERSION)
3076 return BRCTL_VERSION + 1;
3077 return -EINVAL;
3078}
3079
Arnd Bergmann6b960182009-11-06 23:10:54 -08003080static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3081 unsigned int cmd, unsigned long arg)
3082{
3083 void __user *argp = compat_ptr(arg);
3084 struct sock *sk = sock->sk;
3085 struct net *net = sock_net(sk);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003086
Arnd Bergmann6b960182009-11-06 23:10:54 -08003087 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003088 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003089
Arnd Bergmann6b960182009-11-06 23:10:54 -08003090 switch (cmd) {
3091 case SIOCSIFBR:
3092 case SIOCGIFBR:
3093 return old_bridge_ioctl(argp);
3094 case SIOCGIFNAME:
3095 return dev_ifname32(net, argp);
3096 case SIOCGIFCONF:
3097 return dev_ifconf(net, argp);
3098 case SIOCETHTOOL:
3099 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003100 case SIOCWANDEV:
3101 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003102 case SIOCGIFMAP:
3103 case SIOCSIFMAP:
3104 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003105 case SIOCBONDENSLAVE:
3106 case SIOCBONDRELEASE:
3107 case SIOCBONDSETHWADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003108 case SIOCBONDCHANGEACTIVE:
3109 return bond_ioctl(net, cmd, argp);
3110 case SIOCADDRT:
3111 case SIOCDELRT:
3112 return routing_ioctl(net, sock, cmd, argp);
3113 case SIOCGSTAMP:
3114 return do_siocgstamp(net, sock, cmd, argp);
3115 case SIOCGSTAMPNS:
3116 return do_siocgstampns(net, sock, cmd, argp);
Ben Hutchings590d4692013-11-18 17:04:13 +00003117 case SIOCBONDSLAVEINFOQUERY:
3118 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003119 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003120 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003121 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003122
Arnd Bergmann6b960182009-11-06 23:10:54 -08003123 case FIOSETOWN:
3124 case SIOCSPGRP:
3125 case FIOGETOWN:
3126 case SIOCGPGRP:
3127 case SIOCBRADDBR:
3128 case SIOCBRDELBR:
3129 case SIOCGIFVLAN:
3130 case SIOCSIFVLAN:
3131 case SIOCADDDLCI:
3132 case SIOCDELDLCI:
3133 return sock_ioctl(file, cmd, arg);
3134
3135 case SIOCGIFFLAGS:
3136 case SIOCSIFFLAGS:
3137 case SIOCGIFMETRIC:
3138 case SIOCSIFMETRIC:
3139 case SIOCGIFMTU:
3140 case SIOCSIFMTU:
3141 case SIOCGIFMEM:
3142 case SIOCSIFMEM:
3143 case SIOCGIFHWADDR:
3144 case SIOCSIFHWADDR:
3145 case SIOCADDMULTI:
3146 case SIOCDELMULTI:
3147 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003148 case SIOCGIFADDR:
3149 case SIOCSIFADDR:
3150 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003151 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003152 case SIOCGIFBRDADDR:
3153 case SIOCSIFBRDADDR:
3154 case SIOCGIFDSTADDR:
3155 case SIOCSIFDSTADDR:
3156 case SIOCGIFNETMASK:
3157 case SIOCSIFNETMASK:
3158 case SIOCSIFPFLAGS:
3159 case SIOCGIFPFLAGS:
3160 case SIOCGIFTXQLEN:
3161 case SIOCSIFTXQLEN:
3162 case SIOCBRADDIF:
3163 case SIOCBRDELIF:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003164 case SIOCSIFNAME:
3165 case SIOCGMIIPHY:
3166 case SIOCGMIIREG:
3167 case SIOCSMIIREG:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003168 return dev_ifsioc(net, sock, cmd, argp);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003169
Arnd Bergmann6b960182009-11-06 23:10:54 -08003170 case SIOCSARP:
3171 case SIOCGARP:
3172 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003173 case SIOCATMARK:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003174 return sock_do_ioctl(net, sock, cmd, arg);
3175 }
3176
Arnd Bergmann6b960182009-11-06 23:10:54 -08003177 return -ENOIOCTLCMD;
3178}
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003179
Eric Dumazet95c96172012-04-15 05:58:06 +00003180static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003181 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003182{
3183 struct socket *sock = file->private_data;
3184 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003185 struct sock *sk;
3186 struct net *net;
3187
3188 sk = sock->sk;
3189 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003190
3191 if (sock->ops->compat_ioctl)
3192 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3193
David S. Miller87de87d2008-06-03 09:14:03 -07003194 if (ret == -ENOIOCTLCMD &&
3195 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3196 ret = compat_wext_handle_ioctl(net, cmd, arg);
3197
Arnd Bergmann6b960182009-11-06 23:10:54 -08003198 if (ret == -ENOIOCTLCMD)
3199 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3200
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003201 return ret;
3202}
3203#endif
3204
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003205int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3206{
3207 return sock->ops->bind(sock, addr, addrlen);
3208}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003209EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003210
3211int kernel_listen(struct socket *sock, int backlog)
3212{
3213 return sock->ops->listen(sock, backlog);
3214}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003215EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003216
3217int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3218{
3219 struct sock *sk = sock->sk;
3220 int err;
3221
3222 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3223 newsock);
3224 if (err < 0)
3225 goto done;
3226
3227 err = sock->ops->accept(sock, *newsock, flags);
3228 if (err < 0) {
3229 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003230 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003231 goto done;
3232 }
3233
3234 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003235 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003236
3237done:
3238 return err;
3239}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003240EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003241
3242int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003243 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003244{
3245 return sock->ops->connect(sock, addr, addrlen, flags);
3246}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003247EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003248
3249int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3250 int *addrlen)
3251{
3252 return sock->ops->getname(sock, addr, addrlen, 0);
3253}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003254EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003255
3256int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3257 int *addrlen)
3258{
3259 return sock->ops->getname(sock, addr, addrlen, 1);
3260}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003261EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003262
3263int kernel_getsockopt(struct socket *sock, int level, int optname,
3264 char *optval, int *optlen)
3265{
3266 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003267 char __user *uoptval;
3268 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003269 int err;
3270
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003271 uoptval = (char __user __force *) optval;
3272 uoptlen = (int __user __force *) optlen;
3273
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003274 set_fs(KERNEL_DS);
3275 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003276 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003277 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003278 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3279 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003280 set_fs(oldfs);
3281 return err;
3282}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003283EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003284
3285int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003286 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003287{
3288 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003289 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003290 int err;
3291
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003292 uoptval = (char __user __force *) optval;
3293
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003294 set_fs(KERNEL_DS);
3295 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003296 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003297 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003298 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003299 optlen);
3300 set_fs(oldfs);
3301 return err;
3302}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003303EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003304
3305int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3306 size_t size, int flags)
3307{
3308 if (sock->ops->sendpage)
3309 return sock->ops->sendpage(sock, page, offset, size, flags);
3310
3311 return sock_no_sendpage(sock, page, offset, size, flags);
3312}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003313EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003314
3315int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3316{
3317 mm_segment_t oldfs = get_fs();
3318 int err;
3319
3320 set_fs(KERNEL_DS);
3321 err = sock->ops->ioctl(sock, cmd, arg);
3322 set_fs(oldfs);
3323
3324 return err;
3325}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003326EXPORT_SYMBOL(kernel_sock_ioctl);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003327
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003328int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3329{
3330 return sock->ops->shutdown(sock, how);
3331}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003332EXPORT_SYMBOL(kernel_sock_shutdown);