blob: a564c6ed19d5680e1a154c9eeb9da4de0eb71b33 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NET An implementation of the SOCKET network access protocol.
3 *
4 * Version: @(#)socket.c 1.1.93 18/02/95
5 *
6 * Authors: Orest Zborowski, <obz@Kodak.COM>
Jesper Juhl02c30a82005-05-05 16:16:16 -07007 * Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
9 *
10 * Fixes:
11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
12 * shutdown()
13 * Alan Cox : verify_area() fixes
14 * Alan Cox : Removed DDI
15 * Jonathan Kamens : SOCK_DGRAM reconnect bug
16 * Alan Cox : Moved a load of checks to the very
17 * top level.
18 * Alan Cox : Move address structures to/from user
19 * mode above the protocol layers.
20 * Rob Janssen : Allow 0 length sends.
21 * Alan Cox : Asynchronous I/O support (cribbed from the
22 * tty drivers).
23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
24 * Jeff Uphoff : Made max number of sockets command-line
25 * configurable.
26 * Matti Aarnio : Made the number of sockets dynamic,
27 * to be allocated when needed, and mr.
28 * Uphoff's max is used as max to be
29 * allowed to allocate.
30 * Linus : Argh. removed all the socket allocation
31 * altogether: it's in the inode now.
32 * Alan Cox : Made sock_alloc()/sock_release() public
33 * for NetROM and future kernel nfsd type
34 * stuff.
35 * Alan Cox : sendmsg/recvmsg basics.
36 * Tom Dyas : Export net symbols.
37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
38 * Alan Cox : Added thread locking to sys_* calls
39 * for sockets. May have errors at the
40 * moment.
41 * Kevin Buhr : Fixed the dumb errors in the above.
42 * Andi Kleen : Some small cleanups, optimizations,
43 * and fixed a copy_from_user() bug.
44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
Stephen Hemminger89bddce2006-09-01 00:19:31 -070045 * Tigran Aivazian : Made listen(2) backlog sanity checks
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 * protocol-independent
47 *
48 *
49 * This program is free software; you can redistribute it and/or
50 * modify it under the terms of the GNU General Public License
51 * as published by the Free Software Foundation; either version
52 * 2 of the License, or (at your option) any later version.
53 *
54 *
55 * This module is effectively the top level interface to the BSD socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -070056 * paradigm.
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 *
58 * Based upon Swansea University Computer Society NET3.039
59 */
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/socket.h>
63#include <linux/file.h>
64#include <linux/net.h>
65#include <linux/interrupt.h>
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -070066#include <linux/thread_info.h>
Stephen Hemminger55737fd2006-09-01 00:23:39 -070067#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <linux/netdevice.h>
69#include <linux/proc_fs.h>
70#include <linux/seq_file.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080071#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#include <linux/if_bridge.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030073#include <linux/if_frad.h>
74#include <linux/if_vlan.h>
Daniel Borkmann408eccc2014-04-01 16:20:23 +020075#include <linux/ptp_classify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#include <linux/init.h>
77#include <linux/poll.h>
78#include <linux/cache.h>
79#include <linux/module.h>
80#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#include <linux/mount.h>
82#include <linux/security.h>
83#include <linux/syscalls.h>
84#include <linux/compat.h>
85#include <linux/kmod.h>
David Woodhouse3ec3b2f2005-05-17 12:08:48 +010086#include <linux/audit.h>
Adrian Bunkd86b5e02006-01-21 00:46:55 +010087#include <linux/wireless.h>
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -070088#include <linux/nsproxy.h>
Nick Black1fd7317d2009-09-22 16:43:33 -070089#include <linux/magic.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090090#include <linux/slab.h>
Masatake YAMATO600e1772012-08-29 10:44:29 +000091#include <linux/xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080093#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070094#include <asm/unistd.h>
95
96#include <net/compat.h>
David S. Miller87de87d2008-06-03 09:14:03 -070097#include <net/wext.h>
Herbert Xuf8451722010-05-24 00:12:34 -070098#include <net/cls_cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100#include <net/sock.h>
101#include <linux/netfilter.h>
102
Arnd Bergmann6b960182009-11-06 23:10:54 -0800103#include <linux/if_tun.h>
104#include <linux/ipv6_route.h>
105#include <linux/route.h>
Arnd Bergmann6b960182009-11-06 23:10:54 -0800106#include <linux/sockios.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +0300107#include <net/busy_poll.h>
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400108#include <linux/errqueue.h>
Eliezer Tamir06021292013-06-10 11:39:50 +0300109
Cong Wange0d10952013-08-01 11:10:25 +0800110#ifdef CONFIG_NET_RX_BUSY_POLL
Eliezer Tamir64b0dc52013-07-10 17:13:36 +0300111unsigned int sysctl_net_busy_read __read_mostly;
112unsigned int sysctl_net_busy_poll __read_mostly;
Eliezer Tamir06021292013-06-10 11:39:50 +0300113#endif
Arnd Bergmann6b960182009-11-06 23:10:54 -0800114
Al Viro8ae5e0302014-11-28 19:40:50 -0500115static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to);
116static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700117static int sock_mmap(struct file *file, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
119static int sock_close(struct inode *inode, struct file *file);
Linus Torvaldsa11e1d42018-06-28 09:43:44 -0700120static __poll_t sock_poll(struct file *file,
121 struct poll_table_struct *wait);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700122static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800123#ifdef CONFIG_COMPAT
124static long compat_sock_ioctl(struct file *file,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700125 unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800126#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127static int sock_fasync(int fd, struct file *filp, int on);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128static ssize_t sock_sendpage(struct file *file, struct page *page,
129 int offset, size_t size, loff_t *ppos, int more);
Jens Axboe9c55e012007-11-06 23:30:13 -0800130static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700131 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800132 unsigned int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134/*
135 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
136 * in the operation structures but are done directly via the socketcall() multiplexor.
137 */
138
Arjan van de Venda7071d2007-02-12 00:55:36 -0800139static const struct file_operations socket_file_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 .owner = THIS_MODULE,
141 .llseek = no_llseek,
Al Viro8ae5e0302014-11-28 19:40:50 -0500142 .read_iter = sock_read_iter,
143 .write_iter = sock_write_iter,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 .poll = sock_poll,
145 .unlocked_ioctl = sock_ioctl,
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800146#ifdef CONFIG_COMPAT
147 .compat_ioctl = compat_sock_ioctl,
148#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 .mmap = sock_mmap,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 .release = sock_close,
151 .fasync = sock_fasync,
Jens Axboe5274f052006-03-30 15:15:30 +0200152 .sendpage = sock_sendpage,
153 .splice_write = generic_splice_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800154 .splice_read = sock_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155};
156
157/*
158 * The protocol list. Each protocol is registered in here.
159 */
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161static DEFINE_SPINLOCK(net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +0000162static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700165 * Support routines.
166 * Move socket addresses back and forth across the kernel/user
167 * divide and look after the messy bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 */
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170/**
171 * move_addr_to_kernel - copy a socket address into kernel space
172 * @uaddr: Address in user space
173 * @kaddr: Address in kernel space
174 * @ulen: Length in user space
175 *
176 * The address is copied into kernel space. If the provided address is
177 * too long an error code of -EINVAL is returned. If the copy gives
178 * invalid addresses -EFAULT is returned. On a success 0 is returned.
179 */
180
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000181int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182{
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700183 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700185 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700187 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100189 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
192/**
193 * move_addr_to_user - copy an address to user space
194 * @kaddr: kernel space address
195 * @klen: length of address in kernel
196 * @uaddr: user space address
197 * @ulen: pointer to user length field
198 *
199 * The value pointed to by ulen on entry is the buffer length available.
200 * This is overwritten with the buffer space used. -EINVAL is returned
201 * if an overlong buffer is specified or a negative buffer size. -EFAULT
202 * is returned if either the buffer or the length field are not
203 * accessible.
204 * After copying the data up to the limit the user specifies, the true
205 * length of the data is written over the length limit the user
206 * specified. Zero is returned for a success.
207 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700208
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000209static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
stephen hemminger11165f12010-10-18 14:27:29 +0000210 void __user *uaddr, int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211{
212 int err;
213 int len;
214
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100215 BUG_ON(klen > sizeof(struct sockaddr_storage));
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700216 err = get_user(len, ulen);
217 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700219 if (len > klen)
220 len = klen;
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100221 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700223 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500224 if (audit_sockaddr(klen, kaddr))
225 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700226 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 return -EFAULT;
228 }
229 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700230 * "fromlen shall refer to the value before truncation.."
231 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 */
233 return __put_user(klen, ulen);
234}
235
Alexey Dobriyan08009a72018-02-24 21:20:33 +0300236static struct kmem_cache *sock_inode_cachep __ro_after_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
238static struct inode *sock_alloc_inode(struct super_block *sb)
239{
240 struct socket_alloc *ei;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000241 struct socket_wq *wq;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700242
Christoph Lametere94b1762006-12-06 20:33:17 -0800243 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 if (!ei)
245 return NULL;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000246 wq = kmalloc(sizeof(*wq), GFP_KERNEL);
247 if (!wq) {
Eric Dumazet43815482010-04-29 11:01:49 +0000248 kmem_cache_free(sock_inode_cachep, ei);
249 return NULL;
250 }
Eric Dumazeteaefd112011-02-18 03:26:36 +0000251 init_waitqueue_head(&wq->wait);
252 wq->fasync_list = NULL;
Nicolai Stange574aab12015-12-29 13:29:55 +0100253 wq->flags = 0;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000254 RCU_INIT_POINTER(ei->socket.wq, wq);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 ei->socket.state = SS_UNCONNECTED;
257 ei->socket.flags = 0;
258 ei->socket.ops = NULL;
259 ei->socket.sk = NULL;
260 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262 return &ei->vfs_inode;
263}
264
265static void sock_destroy_inode(struct inode *inode)
266{
Eric Dumazet43815482010-04-29 11:01:49 +0000267 struct socket_alloc *ei;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000268 struct socket_wq *wq;
Eric Dumazet43815482010-04-29 11:01:49 +0000269
270 ei = container_of(inode, struct socket_alloc, vfs_inode);
Eric Dumazeteaefd112011-02-18 03:26:36 +0000271 wq = rcu_dereference_protected(ei->socket.wq, 1);
Lai Jiangshan61845222011-03-18 12:10:25 +0800272 kfree_rcu(wq, rcu);
Eric Dumazet43815482010-04-29 11:01:49 +0000273 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274}
275
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700276static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700278 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Christoph Lametera35afb82007-05-16 22:10:57 -0700280 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700282
yuan linyu1e911632017-01-07 17:18:31 +0800283static void init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284{
285 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700286 sizeof(struct socket_alloc),
287 0,
288 (SLAB_HWCACHE_ALIGN |
289 SLAB_RECLAIM_ACCOUNT |
Vladimir Davydov5d097052016-01-14 15:18:21 -0800290 SLAB_MEM_SPREAD | SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +0900291 init_once);
yuan linyu1e911632017-01-07 17:18:31 +0800292 BUG_ON(sock_inode_cachep == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293}
294
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700295static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700296 .alloc_inode = sock_alloc_inode,
297 .destroy_inode = sock_destroy_inode,
298 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299};
300
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700301/*
302 * sockfs_dname() is called from d_path().
303 */
304static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
305{
306 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
David Howellsc5ef6032015-03-17 22:26:16 +0000307 d_inode(dentry)->i_ino);
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700308}
309
Al Viro3ba13d12009-02-20 06:02:22 +0000310static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700311 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312};
313
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200314static int sockfs_xattr_get(const struct xattr_handler *handler,
315 struct dentry *dentry, struct inode *inode,
316 const char *suffix, void *value, size_t size)
317{
318 if (value) {
319 if (dentry->d_name.len + 1 > size)
320 return -ERANGE;
321 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
322 }
323 return dentry->d_name.len + 1;
324}
325
326#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
327#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
328#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
329
330static const struct xattr_handler sockfs_xattr_handler = {
331 .name = XATTR_NAME_SOCKPROTONAME,
332 .get = sockfs_xattr_get,
333};
334
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100335static int sockfs_security_xattr_set(const struct xattr_handler *handler,
336 struct dentry *dentry, struct inode *inode,
337 const char *suffix, const void *value,
338 size_t size, int flags)
339{
340 /* Handled by LSM. */
341 return -EAGAIN;
342}
343
344static const struct xattr_handler sockfs_security_xattr_handler = {
345 .prefix = XATTR_SECURITY_PREFIX,
346 .set = sockfs_security_xattr_set,
347};
348
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200349static const struct xattr_handler *sockfs_xattr_handlers[] = {
350 &sockfs_xattr_handler,
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100351 &sockfs_security_xattr_handler,
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200352 NULL
353};
354
Al Viroc74a1cb2011-01-12 16:59:34 -0500355static struct dentry *sockfs_mount(struct file_system_type *fs_type,
356 int flags, const char *dev_name, void *data)
357{
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200358 return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops,
359 sockfs_xattr_handlers,
360 &sockfs_dentry_operations, SOCKFS_MAGIC);
Al Viroc74a1cb2011-01-12 16:59:34 -0500361}
362
363static struct vfsmount *sock_mnt __read_mostly;
364
365static struct file_system_type sock_fs_type = {
366 .name = "sockfs",
367 .mount = sockfs_mount,
368 .kill_sb = kill_anon_super,
369};
370
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371/*
372 * Obtains the first available file descriptor and sets it up for use.
373 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800374 * These functions create file structures and maps them to fd space
375 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 * and file struct implicitly stored in sock->file.
377 * Note that another thread may close file descriptor before we return
378 * from this function. We use the fact that now we do not refer
379 * to socket after mapping. If one day we will need it, this
380 * function will increment ref. count on file by 1.
381 *
382 * In any case returned fd MAY BE not valid!
383 * This race condition is unavoidable
384 * with shared fd spaces, we cannot solve it inside kernel,
385 * but we take care of internal coherence yet.
386 */
387
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700388struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389{
Al Viro7cbe66b2009-08-05 19:59:08 +0400390 struct qstr name = { .name = "" };
Al Viro2c48b9c2009-08-09 00:52:35 +0400391 struct path path;
Al Viro7cbe66b2009-08-05 19:59:08 +0400392 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800393
Masatake YAMATO600e1772012-08-29 10:44:29 +0000394 if (dname) {
395 name.name = dname;
396 name.len = strlen(name.name);
397 } else if (sock->sk) {
398 name.name = sock->sk->sk_prot_creator->name;
399 name.len = strlen(name.name);
400 }
Nick Piggin4b936882011-01-07 17:50:07 +1100401 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
Al Viro8e1611e2017-12-05 23:29:09 +0000402 if (unlikely(!path.dentry)) {
403 sock_release(sock);
Al Viro28407632012-08-17 23:54:15 -0400404 return ERR_PTR(-ENOMEM);
Al Viro8e1611e2017-12-05 23:29:09 +0000405 }
Al Viro2c48b9c2009-08-09 00:52:35 +0400406 path.mnt = mntget(sock_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Al Viro2c48b9c2009-08-09 00:52:35 +0400408 d_instantiate(path.dentry, SOCK_INODE(sock));
Al Virocc3808f2009-08-06 09:43:59 +0400409
Al Viro2c48b9c2009-08-09 00:52:35 +0400410 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
Al Virocc3808f2009-08-06 09:43:59 +0400411 &socket_file_ops);
Viresh Kumarb5ffe632015-08-12 15:59:47 +0530412 if (IS_ERR(file)) {
Al Viro8e1611e2017-12-05 23:29:09 +0000413 /* drop dentry, keep inode for a bit */
David Howellsc5ef6032015-03-17 22:26:16 +0000414 ihold(d_inode(path.dentry));
Al Viro2c48b9c2009-08-09 00:52:35 +0400415 path_put(&path);
Al Viro8e1611e2017-12-05 23:29:09 +0000416 /* ... and now kill it properly */
417 sock_release(sock);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700418 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400419 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800420
421 sock->file = file;
Ulrich Drepper77d27202008-07-23 21:29:35 -0700422 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800423 file->private_data = sock;
Al Viro28407632012-08-17 23:54:15 -0400424 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800425}
Al Viro56b31d12012-08-18 00:25:51 -0400426EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800427
Al Viro56b31d12012-08-18 00:25:51 -0400428static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800429{
430 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400431 int fd = get_unused_fd_flags(flags);
Al Viroce4bb042018-01-10 18:47:05 -0500432 if (unlikely(fd < 0)) {
433 sock_release(sock);
Al Viro28407632012-08-17 23:54:15 -0400434 return fd;
Al Viroce4bb042018-01-10 18:47:05 -0500435 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800436
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700437 newfile = sock_alloc_file(sock, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -0400438 if (likely(!IS_ERR(newfile))) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800439 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400440 return fd;
441 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400442
Al Viro28407632012-08-17 23:54:15 -0400443 put_unused_fd(fd);
444 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445}
446
John Fastabend406a3c62012-07-20 10:39:25 +0000447struct socket *sock_from_file(struct file *file, int *err)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800448{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800449 if (file->f_op == &socket_file_ops)
450 return file->private_data; /* set in sock_map_fd */
451
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800452 *err = -ENOTSOCK;
453 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800454}
John Fastabend406a3c62012-07-20 10:39:25 +0000455EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800456
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700458 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 * @fd: file handle
460 * @err: pointer to an error code return
461 *
462 * The file handle passed in is locked and the socket it is bound
Rosen, Rami241c4662017-05-21 22:12:38 +0300463 * to is returned. If an error occurs the err pointer is overwritten
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 * with a negative errno code and NULL is returned. The function checks
465 * for both invalid handles and passing a handle which is not a socket.
466 *
467 * On a success the socket object pointer is returned.
468 */
469
470struct socket *sockfd_lookup(int fd, int *err)
471{
472 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 struct socket *sock;
474
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700475 file = fget(fd);
476 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 *err = -EBADF;
478 return NULL;
479 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700480
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800481 sock = sock_from_file(file, err);
482 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 return sock;
485}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700486EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800488static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
489{
Al Viro00e188e2014-03-03 23:48:18 -0500490 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800491 struct socket *sock;
492
Hua Zhong36725582006-04-19 15:25:02 -0700493 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500494 if (f.file) {
495 sock = sock_from_file(f.file, err);
496 if (likely(sock)) {
497 *fput_needed = f.flags;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800498 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500499 }
500 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800501 }
502 return NULL;
503}
504
Masatake YAMATO600e1772012-08-29 10:44:29 +0000505static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
506 size_t size)
507{
508 ssize_t len;
509 ssize_t used = 0;
510
David Howellsc5ef6032015-03-17 22:26:16 +0000511 len = security_inode_listsecurity(d_inode(dentry), buffer, size);
Masatake YAMATO600e1772012-08-29 10:44:29 +0000512 if (len < 0)
513 return len;
514 used += len;
515 if (buffer) {
516 if (size < used)
517 return -ERANGE;
518 buffer += len;
519 }
520
521 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
522 used += len;
523 if (buffer) {
524 if (size < used)
525 return -ERANGE;
526 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
527 buffer += len;
528 }
529
530 return used;
531}
532
Tobias Klauserdc647ec2017-01-10 09:30:51 +0100533static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr)
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900534{
535 int err = simple_setattr(dentry, iattr);
536
Eric Biggerse1a3a602016-12-30 17:42:32 -0600537 if (!err && (iattr->ia_valid & ATTR_UID)) {
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900538 struct socket *sock = SOCKET_I(d_inode(dentry));
539
Cong Wang6d8c50d2018-06-07 13:39:49 -0700540 if (sock->sk)
541 sock->sk->sk_uid = iattr->ia_uid;
542 else
543 err = -ENOENT;
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900544 }
545
546 return err;
547}
548
Masatake YAMATO600e1772012-08-29 10:44:29 +0000549static const struct inode_operations sockfs_inode_ops = {
Masatake YAMATO600e1772012-08-29 10:44:29 +0000550 .listxattr = sockfs_listxattr,
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900551 .setattr = sockfs_setattr,
Masatake YAMATO600e1772012-08-29 10:44:29 +0000552};
553
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554/**
555 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700556 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 * Allocate a new inode and socket object. The two are bound together
558 * and initialised. The socket is then returned. If we are out of inodes
559 * NULL is returned.
560 */
561
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800562struct socket *sock_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700564 struct inode *inode;
565 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200567 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 if (!inode)
569 return NULL;
570
571 sock = SOCKET_I(inode);
572
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400573 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700574 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100575 inode->i_uid = current_fsuid();
576 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000577 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 return sock;
580}
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800581EXPORT_SYMBOL(sock_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583/**
584 * sock_release - close a socket
585 * @sock: socket to close
586 *
587 * The socket is released from the protocol stack if it has a release
588 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700589 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700591
Cong Wang6d8c50d2018-06-07 13:39:49 -0700592static void __sock_release(struct socket *sock, struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593{
594 if (sock->ops) {
595 struct module *owner = sock->ops->owner;
596
Cong Wang6d8c50d2018-06-07 13:39:49 -0700597 if (inode)
598 inode_lock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 sock->ops->release(sock);
Cong Wang6d8c50d2018-06-07 13:39:49 -0700600 if (inode)
601 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 if (!sock->file) {
610 iput(SOCK_INODE(sock));
611 return;
612 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700613 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614}
Cong Wang6d8c50d2018-06-07 13:39:49 -0700615
616void sock_release(struct socket *sock)
617{
618 __sock_release(sock, NULL);
619}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700620EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400622void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000623{
Eric Dumazet140c55d2014-08-06 11:49:29 +0200624 u8 flags = *tx_flags;
625
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400626 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200627 flags |= SKBTX_HW_TSTAMP;
628
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400629 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200630 flags |= SKBTX_SW_TSTAMP;
631
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400632 if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200633 flags |= SKBTX_SCHED_TSTAMP;
634
Eric Dumazet140c55d2014-08-06 11:49:29 +0200635 *tx_flags = flags;
Patrick Ohly20d49472009-02-12 05:03:38 +0000636}
Willem de Bruijn67cc0d42014-09-08 19:58:58 -0400637EXPORT_SYMBOL(__sock_tx_timestamp);
Patrick Ohly20d49472009-02-12 05:03:38 +0000638
Al Virod8725c82014-12-11 00:02:50 -0500639static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640{
Al Viro01e97e62014-12-15 21:39:31 -0500641 int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg));
Al Virod8725c82014-12-11 00:02:50 -0500642 BUG_ON(ret == -EIOCBQUEUED);
643 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644}
Gu Zheng0cf00c62014-12-05 15:14:23 +0800645
Al Virod8725c82014-12-11 00:02:50 -0500646int sock_sendmsg(struct socket *sock, struct msghdr *msg)
Gu Zheng0cf00c62014-12-05 15:14:23 +0800647{
Al Virod8725c82014-12-11 00:02:50 -0500648 int err = security_socket_sendmsg(sock, msg,
Al Viro01e97e62014-12-15 21:39:31 -0500649 msg_data_left(msg));
Ying Xue1b784142015-03-02 15:37:48 +0800650
Al Virod8725c82014-12-11 00:02:50 -0500651 return err ?: sock_sendmsg_nosec(sock, msg);
Gu Zheng0cf00c62014-12-05 15:14:23 +0800652}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700653EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
655int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
656 struct kvec *vec, size_t num, size_t size)
657{
Al Viro6aa24812015-03-21 19:56:16 -0400658 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size);
Al Virod8725c82014-12-11 00:02:50 -0500659 return sock_sendmsg(sock, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700661EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
Tom Herbert306b13e2017-07-28 16:22:41 -0700663int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
664 struct kvec *vec, size_t num, size_t size)
665{
666 struct socket *sock = sk->sk_socket;
667
668 if (!sock->ops->sendmsg_locked)
John Fastabenddb5980d2017-08-15 22:31:34 -0700669 return sock_no_sendmsg_locked(sk, msg, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700670
671 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size);
672
673 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
674}
675EXPORT_SYMBOL(kernel_sendmsg_locked);
676
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400677static bool skb_is_err_queue(const struct sk_buff *skb)
678{
679 /* pkt_type of skbs enqueued on the error queue are set to
680 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
681 * in recvmsg, since skbs received on a local socket will never
682 * have a pkt_type of PACKET_OUTGOING.
683 */
684 return skb->pkt_type == PACKET_OUTGOING;
685}
686
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200687/* On transmit, software and hardware timestamps are returned independently.
688 * As the two skb clones share the hardware timestamp, which may be updated
689 * before the software timestamp is received, a hardware TX timestamp may be
690 * returned only if there is no software TX timestamp. Ignore false software
691 * timestamps, which may be made in the __sock_recv_timestamp() call when the
692 * option SO_TIMESTAMP(NS) is enabled on the socket, even when the skb has a
693 * hardware timestamp.
694 */
695static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
696{
697 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb);
698}
699
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200700static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb)
701{
702 struct scm_ts_pktinfo ts_pktinfo;
703 struct net_device *orig_dev;
704
705 if (!skb_mac_header_was_set(skb))
706 return;
707
708 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo));
709
710 rcu_read_lock();
711 orig_dev = dev_get_by_napi_id(skb_napi_id(skb));
712 if (orig_dev)
713 ts_pktinfo.if_index = orig_dev->ifindex;
714 rcu_read_unlock();
715
716 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb);
717 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
718 sizeof(ts_pktinfo), &ts_pktinfo);
719}
720
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700721/*
722 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
723 */
724void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
725 struct sk_buff *skb)
726{
Patrick Ohly20d49472009-02-12 05:03:38 +0000727 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400728 struct scm_timestamping tss;
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200729 int empty = 1, false_tstamp = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000730 struct skb_shared_hwtstamps *shhwtstamps =
731 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700732
Patrick Ohly20d49472009-02-12 05:03:38 +0000733 /* Race occurred between timestamp enabling and packet
734 receiving. Fill in the current time for now. */
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200735 if (need_software_tstamp && skb->tstamp == 0) {
Patrick Ohly20d49472009-02-12 05:03:38 +0000736 __net_timestamp(skb);
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200737 false_tstamp = 1;
738 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000739
740 if (need_software_tstamp) {
741 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
742 struct timeval tv;
743 skb_get_timestamp(skb, &tv);
744 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
745 sizeof(tv), &tv);
746 } else {
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400747 struct timespec ts;
748 skb_get_timestampns(skb, &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000749 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400750 sizeof(ts), &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000751 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700752 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000753
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400754 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400755 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400756 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000757 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400758 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400759 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200760 !skb_is_swtx_tstamp(skb, false_tstamp) &&
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200761 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) {
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400762 empty = 0;
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200763 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&
764 !skb_is_err_queue(skb))
765 put_ts_pktinfo(msg, skb);
766 }
Francis Yan1c885802016-11-27 23:07:18 -0800767 if (!empty) {
Patrick Ohly20d49472009-02-12 05:03:38 +0000768 put_cmsg(msg, SOL_SOCKET,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400769 SCM_TIMESTAMPING, sizeof(tss), &tss);
Francis Yan1c885802016-11-27 23:07:18 -0800770
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400771 if (skb_is_err_queue(skb) && skb->len &&
Soheil Hassas Yeganeh4ef1b282017-03-18 17:03:00 -0400772 SKB_EXT_ERR(skb)->opt_stats)
Francis Yan1c885802016-11-27 23:07:18 -0800773 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
774 skb->len, skb->data);
775 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700776}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300777EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
778
Johannes Berg6e3e9392011-11-09 10:15:42 +0100779void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
780 struct sk_buff *skb)
781{
782 int ack;
783
784 if (!sock_flag(sk, SOCK_WIFI_STATUS))
785 return;
786 if (!skb->wifi_acked_valid)
787 return;
788
789 ack = skb->wifi_acked;
790
791 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
792}
793EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
794
stephen hemminger11165f12010-10-18 14:27:29 +0000795static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
796 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700797{
Eyal Birger744d5a32015-03-01 14:58:31 +0200798 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
Neil Horman3b885782009-10-12 13:26:31 -0700799 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
Eyal Birger744d5a32015-03-01 14:58:31 +0200800 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
Neil Horman3b885782009-10-12 13:26:31 -0700801}
802
Eric Dumazet767dd032010-04-28 19:14:43 +0000803void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700804 struct sk_buff *skb)
805{
806 sock_recv_timestamp(msg, sk, skb);
807 sock_recv_drops(msg, sk, skb);
808}
Eric Dumazet767dd032010-04-28 19:14:43 +0000809EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700810
Ying Xue1b784142015-03-02 15:37:48 +0800811static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
Al Viro2da62902015-03-14 21:13:46 -0400812 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813{
Al Viro2da62902015-03-14 21:13:46 -0400814 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815}
816
Al Viro2da62902015-03-14 21:13:46 -0400817int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700818{
Al Viro2da62902015-03-14 21:13:46 -0400819 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700820
Al Viro2da62902015-03-14 21:13:46 -0400821 return err ?: sock_recvmsg_nosec(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700823EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
Martin Lucinac1249c02010-12-10 00:04:05 +0000825/**
826 * kernel_recvmsg - Receive a message from a socket (kernel space)
827 * @sock: The socket to receive the message from
828 * @msg: Received message
829 * @vec: Input s/g array for message data
830 * @num: Size of input s/g array
831 * @size: Number of bytes to read
832 * @flags: Message flags (MSG_DONTWAIT, etc...)
833 *
834 * On return the msg structure contains the scatter/gather array passed in the
835 * vec argument. The array is modified so that it consists of the unfilled
836 * portion of the original array.
837 *
838 * The returned value is the total number of bytes received, or an error.
839 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700840int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
841 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842{
843 mm_segment_t oldfs = get_fs();
844 int result;
845
Al Viro6aa24812015-03-21 19:56:16 -0400846 iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 set_fs(KERNEL_DS);
Al Viro2da62902015-03-14 21:13:46 -0400848 result = sock_recvmsg(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 set_fs(oldfs);
850 return result;
851}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700852EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300854static ssize_t sock_sendpage(struct file *file, struct page *page,
855 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856{
857 struct socket *sock;
858 int flags;
859
Eric Dumazetb69aee02005-09-06 14:42:45 -0700860 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
Eric Dumazet35f9c092012-04-05 03:05:35 +0000862 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
863 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
864 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865
Linus Torvaldse6949582009-08-13 08:28:36 -0700866 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867}
868
Jens Axboe9c55e012007-11-06 23:30:13 -0800869static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700870 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800871 unsigned int flags)
872{
873 struct socket *sock = file->private_data;
874
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800875 if (unlikely(!sock->ops->splice_read))
876 return -EINVAL;
877
Jens Axboe9c55e012007-11-06 23:30:13 -0800878 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
879}
880
Al Viro8ae5e0302014-11-28 19:40:50 -0500881static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800882{
Al Viro6d652332015-01-30 16:12:56 -0500883 struct file *file = iocb->ki_filp;
884 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700885 struct msghdr msg = {.msg_iter = *to,
886 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -0500887 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800888
Al Viro8ae5e0302014-11-28 19:40:50 -0500889 if (file->f_flags & O_NONBLOCK)
890 msg.msg_flags = MSG_DONTWAIT;
891
892 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800893 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700894
Christoph Hellwig66ee59a2015-02-11 19:56:46 +0100895 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800896 return 0;
897
Al Viro2da62902015-03-14 21:13:46 -0400898 res = sock_recvmsg(sock, &msg, msg.msg_flags);
Al Viro8ae5e0302014-11-28 19:40:50 -0500899 *to = msg.msg_iter;
900 return res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800901}
902
Al Viro8ae5e0302014-11-28 19:40:50 -0500903static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904{
Al Viro6d652332015-01-30 16:12:56 -0500905 struct file *file = iocb->ki_filp;
906 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700907 struct msghdr msg = {.msg_iter = *from,
908 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -0500909 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800910
Al Viro8ae5e0302014-11-28 19:40:50 -0500911 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800912 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700913
Al Viro8ae5e0302014-11-28 19:40:50 -0500914 if (file->f_flags & O_NONBLOCK)
915 msg.msg_flags = MSG_DONTWAIT;
916
Al Viro6d652332015-01-30 16:12:56 -0500917 if (sock->type == SOCK_SEQPACKET)
918 msg.msg_flags |= MSG_EOR;
919
Al Virod8725c82014-12-11 00:02:50 -0500920 res = sock_sendmsg(sock, &msg);
Al Viro8ae5e0302014-11-28 19:40:50 -0500921 *from = msg.msg_iter;
922 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923}
924
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925/*
926 * Atomic setting of ioctl hooks to avoid race
927 * with module unload.
928 */
929
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800930static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700931static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932
Eric W. Biederman881d9662007-09-17 11:56:21 -0700933void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800935 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800937 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938}
939EXPORT_SYMBOL(brioctl_set);
940
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800941static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700942static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
Eric W. Biederman881d9662007-09-17 11:56:21 -0700944void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800946 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800948 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949}
950EXPORT_SYMBOL(vlan_ioctl_set);
951
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800952static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700953static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700955void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800957 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800959 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960}
961EXPORT_SYMBOL(dlci_ioctl_set);
962
Arnd Bergmann6b960182009-11-06 23:10:54 -0800963static long sock_do_ioctl(struct net *net, struct socket *sock,
964 unsigned int cmd, unsigned long arg)
965{
966 int err;
967 void __user *argp = (void __user *)arg;
968
969 err = sock->ops->ioctl(sock, cmd, arg);
970
971 /*
972 * If this ioctl is unknown try to hand it down
973 * to the NIC driver.
974 */
Al Viro36fd6332017-06-26 13:19:16 -0400975 if (err != -ENOIOCTLCMD)
976 return err;
Arnd Bergmann6b960182009-11-06 23:10:54 -0800977
Al Viro36fd6332017-06-26 13:19:16 -0400978 if (cmd == SIOCGIFCONF) {
979 struct ifconf ifc;
980 if (copy_from_user(&ifc, argp, sizeof(struct ifconf)))
981 return -EFAULT;
982 rtnl_lock();
983 err = dev_ifconf(net, &ifc, sizeof(struct ifreq));
984 rtnl_unlock();
985 if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf)))
986 err = -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -0400987 } else {
988 struct ifreq ifr;
989 bool need_copyout;
990 if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
991 return -EFAULT;
992 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
993 if (!err && need_copyout)
994 if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
995 return -EFAULT;
Al Viro36fd6332017-06-26 13:19:16 -0400996 }
Arnd Bergmann6b960182009-11-06 23:10:54 -0800997 return err;
998}
999
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000/*
1001 * With an ioctl, arg may well be a user mode pointer, but we don't know
1002 * what to do with it - that's up to the protocol still.
1003 */
1004
Kirill Tkhaid8d211a2018-02-14 16:39:56 +03001005struct ns_common *get_net_ns(struct ns_common *ns)
Andrey Vaginc62cce22016-10-24 18:29:13 -07001006{
1007 return &get_net(container_of(ns, struct net, ns))->ns;
1008}
Kirill Tkhaid8d211a2018-02-14 16:39:56 +03001009EXPORT_SYMBOL_GPL(get_net_ns);
Andrey Vaginc62cce22016-10-24 18:29:13 -07001010
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1012{
1013 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001014 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 void __user *argp = (void __user *)arg;
1016 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001017 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018
Eric Dumazetb69aee02005-09-06 14:42:45 -07001019 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001020 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001021 net = sock_net(sk);
Al Viro44c02a22017-10-05 12:59:44 -04001022 if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
1023 struct ifreq ifr;
1024 bool need_copyout;
1025 if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
1026 return -EFAULT;
1027 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
1028 if (!err && need_copyout)
1029 if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
1030 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001032#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Al Virob1b0c242017-10-01 20:13:08 -04001034 err = wext_handle_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001036#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001037 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 case FIOSETOWN:
1039 case SIOCSPGRP:
1040 err = -EFAULT;
1041 if (get_user(pid, (int __user *)argp))
1042 break;
Jiri Slaby393cc3f2017-06-13 13:35:50 +02001043 err = f_setown(sock->file, pid, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 break;
1045 case FIOGETOWN:
1046 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001047 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001048 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 break;
1050 case SIOCGIFBR:
1051 case SIOCSIFBR:
1052 case SIOCBRADDBR:
1053 case SIOCBRDELBR:
1054 err = -ENOPKG;
1055 if (!br_ioctl_hook)
1056 request_module("bridge");
1057
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001058 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001059 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001060 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001061 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 break;
1063 case SIOCGIFVLAN:
1064 case SIOCSIFVLAN:
1065 err = -ENOPKG;
1066 if (!vlan_ioctl_hook)
1067 request_module("8021q");
1068
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001069 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001071 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001072 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 case SIOCADDDLCI:
1075 case SIOCDELDLCI:
1076 err = -ENOPKG;
1077 if (!dlci_ioctl_hook)
1078 request_module("dlci");
1079
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001080 mutex_lock(&dlci_ioctl_mutex);
1081 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001083 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 break;
Andrey Vaginc62cce22016-10-24 18:29:13 -07001085 case SIOCGSKNS:
1086 err = -EPERM;
1087 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1088 break;
1089
1090 err = open_related_ns(&net->ns, get_net_ns);
1091 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 default:
Arnd Bergmann6b960182009-11-06 23:10:54 -08001093 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001095 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 return err;
1097}
1098
1099int sock_create_lite(int family, int type, int protocol, struct socket **res)
1100{
1101 int err;
1102 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001103
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 err = security_socket_create(family, type, protocol, 1);
1105 if (err)
1106 goto out;
1107
1108 sock = sock_alloc();
1109 if (!sock) {
1110 err = -ENOMEM;
1111 goto out;
1112 }
1113
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001115 err = security_socket_post_create(sock, family, type, protocol, 1);
1116 if (err)
1117 goto out_release;
1118
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119out:
1120 *res = sock;
1121 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001122out_release:
1123 sock_release(sock);
1124 sock = NULL;
1125 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001127EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128
1129/* No kernel lock held - perfect */
Al Viroade994f2017-07-03 00:01:49 -04001130static __poll_t sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131{
Christoph Hellwig3cafb372018-01-09 16:07:34 +01001132 struct socket *sock = file->private_data;
Linus Torvaldsa11e1d42018-06-28 09:43:44 -07001133 __poll_t events = poll_requested_events(wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134
Linus Torvaldsa11e1d42018-06-28 09:43:44 -07001135 sock_poll_busy_loop(sock, events);
1136 return sock->ops->poll(file, sock, wait) | sock_poll_busy_flag(sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137}
1138
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001139static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001141 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142
1143 return sock->ops->mmap(file, sock, vma);
1144}
1145
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001146static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147{
Cong Wang6d8c50d2018-06-07 13:39:49 -07001148 __sock_release(SOCKET_I(inode), inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 return 0;
1150}
1151
1152/*
1153 * Update the socket async list
1154 *
1155 * Fasync_list locking strategy.
1156 *
1157 * 1. fasync_list is modified only under process context socket lock
1158 * i.e. under semaphore.
1159 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001160 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 */
1162
1163static int sock_fasync(int fd, struct file *filp, int on)
1164{
Eric Dumazet989a2972010-04-14 09:55:35 +00001165 struct socket *sock = filp->private_data;
1166 struct sock *sk = sock->sk;
Eric Dumazeteaefd112011-02-18 03:26:36 +00001167 struct socket_wq *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168
Eric Dumazet989a2972010-04-14 09:55:35 +00001169 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171
1172 lock_sock(sk);
Hannes Frederic Sowa1e1d04e2016-04-05 17:10:15 +02001173 wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk));
Eric Dumazeteaefd112011-02-18 03:26:36 +00001174 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175
Eric Dumazeteaefd112011-02-18 03:26:36 +00001176 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001177 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001178 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001179 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180
Eric Dumazet989a2972010-04-14 09:55:35 +00001181 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 return 0;
1183}
1184
Eric Dumazetceb5d582015-11-29 20:03:11 -08001185/* This function may be called only under rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
Eric Dumazetceb5d582015-11-29 20:03:11 -08001187int sock_wake_async(struct socket_wq *wq, int how, int band)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188{
Eric Dumazetceb5d582015-11-29 20:03:11 -08001189 if (!wq || !wq->fasync_list)
1190 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001191
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001192 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001193 case SOCK_WAKE_WAITD:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001194 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 break;
1196 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001197 case SOCK_WAKE_SPACE:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001198 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 break;
1200 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001201 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001202call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001203 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001205 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001206 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08001208
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 return 0;
1210}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001211EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212
Pavel Emelyanov721db932010-09-29 16:06:32 +04001213int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001214 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215{
1216 int err;
1217 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001218 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219
1220 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001221 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 */
1223 if (family < 0 || family >= NPROTO)
1224 return -EAFNOSUPPORT;
1225 if (type < 0 || type >= SOCK_MAX)
1226 return -EINVAL;
1227
1228 /* Compatibility.
1229
1230 This uglymoron is moved from INET layer to here to avoid
1231 deadlock in module load.
1232 */
1233 if (family == PF_INET && type == SOCK_PACKET) {
liping.zhangf3c98692016-03-11 23:08:36 +08001234 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1235 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 family = PF_PACKET;
1237 }
1238
1239 err = security_socket_create(family, type, protocol, kern);
1240 if (err)
1241 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001242
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001243 /*
1244 * Allocate the socket and allow the family to set things up. if
1245 * the protocol is 0, the family is instructed to select an appropriate
1246 * default.
1247 */
1248 sock = sock_alloc();
1249 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001250 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001251 return -ENFILE; /* Not exactly a match, but its the
1252 closest posix thing */
1253 }
1254
1255 sock->type = type;
1256
Johannes Berg95a5afc2008-10-16 15:24:51 -07001257#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001258 /* Attempt to load a protocol module if the find failed.
1259 *
1260 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 * requested real, full-featured networking support upon configuration.
1262 * Otherwise module support will break!
1263 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001264 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001265 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266#endif
1267
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001268 rcu_read_lock();
1269 pf = rcu_dereference(net_families[family]);
1270 err = -EAFNOSUPPORT;
1271 if (!pf)
1272 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273
1274 /*
1275 * We will call the ->create function, that possibly is in a loadable
1276 * module, so we have to bump that loadable module refcnt first.
1277 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001278 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 goto out_release;
1280
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001281 /* Now protected by module ref count */
1282 rcu_read_unlock();
1283
Eric Paris3f378b62009-11-05 22:18:14 -08001284 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001285 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001287
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 /*
1289 * Now to bump the refcnt of the [loadable] module that owns this
1290 * socket at sock_release time we decrement its refcnt.
1291 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001292 if (!try_module_get(sock->ops->owner))
1293 goto out_module_busy;
1294
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 /*
1296 * Now that we're done with the ->create function, the [loadable]
1297 * module can have its refcnt decremented
1298 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001299 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001300 err = security_socket_post_create(sock, family, type, protocol, kern);
1301 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001302 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001303 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001305 return 0;
1306
1307out_module_busy:
1308 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001310 sock->ops = NULL;
1311 module_put(pf->owner);
1312out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001314 return err;
1315
1316out_release:
1317 rcu_read_unlock();
1318 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001320EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321
1322int sock_create(int family, int type, int protocol, struct socket **res)
1323{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001324 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001326EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001328int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329{
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001330 return __sock_create(net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001332EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001334int __sys_socket(int family, int type, int protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335{
1336 int retval;
1337 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001338 int flags;
1339
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001340 /* Check the SOCK_* constants for consistency. */
1341 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1342 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1343 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1344 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1345
Ulrich Dreppera677a032008-07-23 21:29:17 -07001346 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001347 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001348 return -EINVAL;
1349 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001351 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1352 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1353
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 retval = sock_create(family, type, protocol, &sock);
1355 if (retval < 0)
Al Viro8e1611e2017-12-05 23:29:09 +00001356 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357
Al Viro8e1611e2017-12-05 23:29:09 +00001358 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359}
1360
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001361SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1362{
1363 return __sys_socket(family, type, protocol);
1364}
1365
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366/*
1367 * Create a pair of connected sockets.
1368 */
1369
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001370int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371{
1372 struct socket *sock1, *sock2;
1373 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001374 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001375 int flags;
1376
1377 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001378 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001379 return -EINVAL;
1380 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001382 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1383 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1384
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 /*
Al Viro016a2662017-12-05 23:28:38 +00001386 * reserve descriptors and make sure we won't fail
1387 * to return them to userland.
1388 */
1389 fd1 = get_unused_fd_flags(flags);
1390 if (unlikely(fd1 < 0))
1391 return fd1;
1392
1393 fd2 = get_unused_fd_flags(flags);
1394 if (unlikely(fd2 < 0)) {
1395 put_unused_fd(fd1);
1396 return fd2;
1397 }
1398
1399 err = put_user(fd1, &usockvec[0]);
1400 if (err)
1401 goto out;
1402
1403 err = put_user(fd2, &usockvec[1]);
1404 if (err)
1405 goto out;
1406
1407 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 * Obtain the first socket and check if the underlying protocol
1409 * supports the socketpair call.
1410 */
1411
1412 err = sock_create(family, type, protocol, &sock1);
Al Viro016a2662017-12-05 23:28:38 +00001413 if (unlikely(err < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 goto out;
1415
1416 err = sock_create(family, type, protocol, &sock2);
Al Viro016a2662017-12-05 23:28:38 +00001417 if (unlikely(err < 0)) {
1418 sock_release(sock1);
1419 goto out;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001420 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001421
David Herrmannd47cd942018-05-04 16:28:20 +02001422 err = security_socket_socketpair(sock1, sock2);
1423 if (unlikely(err)) {
1424 sock_release(sock2);
1425 sock_release(sock1);
1426 goto out;
1427 }
1428
Al Viro016a2662017-12-05 23:28:38 +00001429 err = sock1->ops->socketpair(sock1, sock2);
1430 if (unlikely(err < 0)) {
1431 sock_release(sock2);
1432 sock_release(sock1);
1433 goto out;
Al Viro28407632012-08-17 23:54:15 -04001434 }
1435
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001436 newfile1 = sock_alloc_file(sock1, flags, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301437 if (IS_ERR(newfile1)) {
Al Viro28407632012-08-17 23:54:15 -04001438 err = PTR_ERR(newfile1);
Al Viro016a2662017-12-05 23:28:38 +00001439 sock_release(sock2);
1440 goto out;
Al Viro28407632012-08-17 23:54:15 -04001441 }
1442
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001443 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001444 if (IS_ERR(newfile2)) {
1445 err = PTR_ERR(newfile2);
Al Viro016a2662017-12-05 23:28:38 +00001446 fput(newfile1);
1447 goto out;
Al Virodb349502007-02-07 01:48:00 -05001448 }
1449
Al Viro157cf642008-12-14 04:57:47 -05001450 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001451
Al Virodb349502007-02-07 01:48:00 -05001452 fd_install(fd1, newfile1);
1453 fd_install(fd2, newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001454 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456out:
Al Viro016a2662017-12-05 23:28:38 +00001457 put_unused_fd(fd2);
1458 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459 return err;
1460}
1461
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001462SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1463 int __user *, usockvec)
1464{
1465 return __sys_socketpair(family, type, protocol, usockvec);
1466}
1467
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468/*
1469 * Bind a name to a socket. Nothing much to do here since it's
1470 * the protocol's responsibility to handle the local address.
1471 *
1472 * We move the socket address to kernel space before we call
1473 * the protocol layer (having also checked the address is ok).
1474 */
1475
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001476int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477{
1478 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001479 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001480 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001482 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001483 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001484 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001485 if (err >= 0) {
1486 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001487 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001488 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001489 if (!err)
1490 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001491 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001492 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001494 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001495 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 return err;
1497}
1498
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001499SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1500{
1501 return __sys_bind(fd, umyaddr, addrlen);
1502}
1503
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504/*
1505 * Perform a listen. Basically, we allow the protocol to do anything
1506 * necessary for a listen, and if that works, we mark the socket as
1507 * ready for listening.
1508 */
1509
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001510int __sys_listen(int fd, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511{
1512 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001513 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001514 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001515
1516 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1517 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001518 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001519 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001520 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521
1522 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001523 if (!err)
1524 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001526 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 }
1528 return err;
1529}
1530
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001531SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1532{
1533 return __sys_listen(fd, backlog);
1534}
1535
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536/*
1537 * For accept, we attempt to create a new socket, set up the link
1538 * with the client, wake up the client, then return the new
1539 * connected fd. We collect the address of the connector in kernel
1540 * space and move it to user at the very end. This is unclean because
1541 * we open the socket then return an error.
1542 *
1543 * 1003.1g adds the ability to recvmsg() to query connection pending
1544 * status to recvmsg. We need to add that support in a way thats
Geert Uytterhoevenb9030362018-03-02 14:43:23 +01001545 * clean when we restructure accept also.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546 */
1547
Dominik Brodowski4541e802018-03-13 19:24:23 +01001548int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
1549 int __user *upeer_addrlen, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550{
1551 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001552 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001553 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001554 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555
Ulrich Drepper77d27202008-07-23 21:29:35 -07001556 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001557 return -EINVAL;
1558
1559 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1560 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1561
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001562 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 if (!sock)
1564 goto out;
1565
1566 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001567 newsock = sock_alloc();
1568 if (!newsock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 goto out_put;
1570
1571 newsock->type = sock->type;
1572 newsock->ops = sock->ops;
1573
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574 /*
1575 * We don't need try_module_get here, as the listening socket (sock)
1576 * has the protocol module (sock->ops->owner) held.
1577 */
1578 __module_get(newsock->ops->owner);
1579
Al Viro28407632012-08-17 23:54:15 -04001580 newfd = get_unused_fd_flags(flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001581 if (unlikely(newfd < 0)) {
1582 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001583 sock_release(newsock);
1584 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001585 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001586 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301587 if (IS_ERR(newfile)) {
Al Viro28407632012-08-17 23:54:15 -04001588 err = PTR_ERR(newfile);
1589 put_unused_fd(newfd);
Al Viro28407632012-08-17 23:54:15 -04001590 goto out_put;
1591 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001592
Frank Filza79af592005-09-27 15:23:38 -07001593 err = security_socket_accept(sock, newsock);
1594 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001595 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001596
David Howellscdfbabf2017-03-09 08:09:05 +00001597 err = sock->ops->accept(sock, newsock, sock->file->f_flags, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001599 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600
1601 if (upeer_sockaddr) {
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001602 len = newsock->ops->getname(newsock,
1603 (struct sockaddr *)&address, 2);
1604 if (len < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001606 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001608 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001609 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001611 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 }
1613
1614 /* File flags are not inherited via accept() unlike another OSes. */
1615
David S. Miller39d8c1b2006-03-20 17:13:49 -08001616 fd_install(newfd, newfile);
1617 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001620 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621out:
1622 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001623out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001624 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001625 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626 goto out_put;
1627}
1628
Dominik Brodowski4541e802018-03-13 19:24:23 +01001629SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1630 int __user *, upeer_addrlen, int, flags)
1631{
1632 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
1633}
1634
Heiko Carstens20f37032009-01-14 14:14:23 +01001635SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1636 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001637{
Dominik Brodowski4541e802018-03-13 19:24:23 +01001638 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001639}
1640
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641/*
1642 * Attempt to connect to a socket with the server address. The address
1643 * is in user space so we verify it is OK and move it to kernel space.
1644 *
1645 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1646 * break bindings
1647 *
1648 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1649 * other SEQPACKET protocols that take time to connect() as it doesn't
1650 * include the -EINPROGRESS status for such sockets.
1651 */
1652
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01001653int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654{
1655 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001656 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001657 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001659 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 if (!sock)
1661 goto out;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001662 err = move_addr_to_kernel(uservaddr, addrlen, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663 if (err < 0)
1664 goto out_put;
1665
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001666 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001667 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668 if (err)
1669 goto out_put;
1670
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001671 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672 sock->file->f_flags);
1673out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001674 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675out:
1676 return err;
1677}
1678
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01001679SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1680 int, addrlen)
1681{
1682 return __sys_connect(fd, uservaddr, addrlen);
1683}
1684
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685/*
1686 * Get the local address ('name') of a socket object. Move the obtained
1687 * name to user space.
1688 */
1689
Dominik Brodowski8882a102018-03-13 19:43:14 +01001690int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1691 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692{
1693 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001694 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001695 int err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001696
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001697 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698 if (!sock)
1699 goto out;
1700
1701 err = security_socket_getsockname(sock);
1702 if (err)
1703 goto out_put;
1704
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001705 err = sock->ops->getname(sock, (struct sockaddr *)&address, 0);
1706 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707 goto out_put;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001708 /* "err" is actually length in this case */
1709 err = move_addr_to_user(&address, err, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710
1711out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001712 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713out:
1714 return err;
1715}
1716
Dominik Brodowski8882a102018-03-13 19:43:14 +01001717SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1718 int __user *, usockaddr_len)
1719{
1720 return __sys_getsockname(fd, usockaddr, usockaddr_len);
1721}
1722
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723/*
1724 * Get the remote address ('name') of a socket object. Move the obtained
1725 * name to user space.
1726 */
1727
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001728int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1729 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730{
1731 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001732 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001733 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001735 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1736 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737 err = security_socket_getpeername(sock);
1738 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001739 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 return err;
1741 }
1742
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001743 err = sock->ops->getname(sock, (struct sockaddr *)&address, 1);
1744 if (err >= 0)
1745 /* "err" is actually length in this case */
1746 err = move_addr_to_user(&address, err, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001747 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001748 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 }
1750 return err;
1751}
1752
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001753SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1754 int __user *, usockaddr_len)
1755{
1756 return __sys_getpeername(fd, usockaddr, usockaddr_len);
1757}
1758
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759/*
1760 * Send a datagram to a given address. We move the address into kernel
1761 * space and check the user space data area is readable before invoking
1762 * the protocol.
1763 */
Dominik Brodowski211b6342018-03-13 19:18:52 +01001764int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
1765 struct sockaddr __user *addr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766{
1767 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001768 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769 int err;
1770 struct msghdr msg;
1771 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001772 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001773
Al Viro602bd0e2015-03-21 19:12:32 -04001774 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
1775 if (unlikely(err))
1776 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001777 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1778 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001779 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001780
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001781 msg.msg_name = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001782 msg.msg_control = NULL;
1783 msg.msg_controllen = 0;
1784 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001785 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001786 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001787 if (err < 0)
1788 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001789 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001790 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791 }
1792 if (sock->file->f_flags & O_NONBLOCK)
1793 flags |= MSG_DONTWAIT;
1794 msg.msg_flags = flags;
Al Virod8725c82014-12-11 00:02:50 -05001795 err = sock_sendmsg(sock, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001797out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001798 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001799out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 return err;
1801}
1802
Dominik Brodowski211b6342018-03-13 19:18:52 +01001803SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1804 unsigned int, flags, struct sockaddr __user *, addr,
1805 int, addr_len)
1806{
1807 return __sys_sendto(fd, buff, len, flags, addr, addr_len);
1808}
1809
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001811 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812 */
1813
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001814SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001815 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816{
Dominik Brodowski211b6342018-03-13 19:18:52 +01001817 return __sys_sendto(fd, buff, len, flags, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818}
1819
1820/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001821 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 * sender. We verify the buffers are writable and if needed move the
1823 * sender address from kernel to user space.
1824 */
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01001825int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
1826 struct sockaddr __user *addr, int __user *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827{
1828 struct socket *sock;
1829 struct iovec iov;
1830 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001831 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001832 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001833 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834
Al Viro602bd0e2015-03-21 19:12:32 -04001835 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
1836 if (unlikely(err))
1837 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001838 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001840 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001842 msg.msg_control = NULL;
1843 msg.msg_controllen = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01001844 /* Save some cycles and don't copy the address if not needed */
1845 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1846 /* We assume all kernel code knows the size of sockaddr_storage */
1847 msg.msg_namelen = 0;
tadeusz.struk@intel.com130ed5d2015-12-15 10:46:17 -08001848 msg.msg_iocb = NULL;
Alexander Potapenko9f138fa2017-03-08 18:08:16 +01001849 msg.msg_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850 if (sock->file->f_flags & O_NONBLOCK)
1851 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04001852 err = sock_recvmsg(sock, &msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001854 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001855 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001856 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001857 if (err2 < 0)
1858 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001860
1861 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001862out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863 return err;
1864}
1865
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01001866SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1867 unsigned int, flags, struct sockaddr __user *, addr,
1868 int __user *, addr_len)
1869{
1870 return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len);
1871}
1872
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001874 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 */
1876
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02001877SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1878 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879{
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01001880 return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881}
1882
1883/*
1884 * Set a socket option. Because we don't know the option lengths we have
1885 * to pass the user mode parameter for the protocols to sort out.
1886 */
1887
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01001888static int __sys_setsockopt(int fd, int level, int optname,
1889 char __user *optval, int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001891 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 struct socket *sock;
1893
1894 if (optlen < 0)
1895 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001896
1897 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1898 if (sock != NULL) {
1899 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001900 if (err)
1901 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902
1903 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001904 err =
1905 sock_setsockopt(sock, level, optname, optval,
1906 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001908 err =
1909 sock->ops->setsockopt(sock, level, optname, optval,
1910 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001911out_put:
1912 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 }
1914 return err;
1915}
1916
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01001917SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1918 char __user *, optval, int, optlen)
1919{
1920 return __sys_setsockopt(fd, level, optname, optval, optlen);
1921}
1922
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923/*
1924 * Get a socket option. Because we don't know the option lengths we have
1925 * to pass a user mode parameter for the protocols to sort out.
1926 */
1927
Dominik Brodowski13a2d702018-03-13 20:15:04 +01001928static int __sys_getsockopt(int fd, int level, int optname,
1929 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001931 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 struct socket *sock;
1933
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001934 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1935 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001936 err = security_socket_getsockopt(sock, level, optname);
1937 if (err)
1938 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939
1940 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001941 err =
1942 sock_getsockopt(sock, level, optname, optval,
1943 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001945 err =
1946 sock->ops->getsockopt(sock, level, optname, optval,
1947 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001948out_put:
1949 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950 }
1951 return err;
1952}
1953
Dominik Brodowski13a2d702018-03-13 20:15:04 +01001954SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1955 char __user *, optval, int __user *, optlen)
1956{
1957 return __sys_getsockopt(fd, level, optname, optval, optlen);
1958}
1959
Linus Torvalds1da177e2005-04-16 15:20:36 -07001960/*
1961 * Shutdown a socket.
1962 */
1963
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01001964int __sys_shutdown(int fd, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001966 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 struct socket *sock;
1968
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001969 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1970 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001972 if (!err)
1973 err = sock->ops->shutdown(sock, how);
1974 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 }
1976 return err;
1977}
1978
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01001979SYSCALL_DEFINE2(shutdown, int, fd, int, how)
1980{
1981 return __sys_shutdown(fd, how);
1982}
1983
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001984/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001985 * fields which are the same type (int / unsigned) on our platforms.
1986 */
1987#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1988#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1989#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1990
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001991struct used_address {
1992 struct sockaddr_storage name;
1993 unsigned int name_len;
1994};
1995
Al Viroda184282015-03-21 19:29:06 -04001996static int copy_msghdr_from_user(struct msghdr *kmsg,
1997 struct user_msghdr __user *umsg,
1998 struct sockaddr __user **save_addr,
1999 struct iovec **iov)
Dan Carpenter1661bf32013-10-03 00:27:20 +03002000{
Al Viroffb07552017-06-27 19:32:04 -04002001 struct user_msghdr msg;
Al Viro08adb7d2014-11-10 20:23:13 -05002002 ssize_t err;
2003
Al Viroffb07552017-06-27 19:32:04 -04002004 if (copy_from_user(&msg, umsg, sizeof(*umsg)))
Dan Carpenter1661bf32013-10-03 00:27:20 +03002005 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00002006
Paolo Abeni864d9662017-07-21 18:49:45 +02002007 kmsg->msg_control = (void __force *)msg.msg_control;
Al Viroffb07552017-06-27 19:32:04 -04002008 kmsg->msg_controllen = msg.msg_controllen;
2009 kmsg->msg_flags = msg.msg_flags;
2010
2011 kmsg->msg_namelen = msg.msg_namelen;
2012 if (!msg.msg_name)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07002013 kmsg->msg_namelen = 0;
2014
Matthew Leachdbb490b2014-03-11 11:58:27 +00002015 if (kmsg->msg_namelen < 0)
2016 return -EINVAL;
2017
Dan Carpenter1661bf32013-10-03 00:27:20 +03002018 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03002019 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05002020
2021 if (save_addr)
Al Viroffb07552017-06-27 19:32:04 -04002022 *save_addr = msg.msg_name;
Al Viro08adb7d2014-11-10 20:23:13 -05002023
Al Viroffb07552017-06-27 19:32:04 -04002024 if (msg.msg_name && kmsg->msg_namelen) {
Al Viro08adb7d2014-11-10 20:23:13 -05002025 if (!save_addr) {
Paolo Abeni864d9662017-07-21 18:49:45 +02002026 err = move_addr_to_kernel(msg.msg_name,
2027 kmsg->msg_namelen,
Al Viro08adb7d2014-11-10 20:23:13 -05002028 kmsg->msg_name);
2029 if (err < 0)
2030 return err;
2031 }
2032 } else {
2033 kmsg->msg_name = NULL;
2034 kmsg->msg_namelen = 0;
2035 }
2036
Al Viroffb07552017-06-27 19:32:04 -04002037 if (msg.msg_iovlen > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05002038 return -EMSGSIZE;
2039
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002040 kmsg->msg_iocb = NULL;
2041
Al Viroffb07552017-06-27 19:32:04 -04002042 return import_iovec(save_addr ? READ : WRITE,
2043 msg.msg_iov, msg.msg_iovlen,
Al Viroda184282015-03-21 19:29:06 -04002044 UIO_FASTIOV, iov, &kmsg->msg_iter);
Dan Carpenter1661bf32013-10-03 00:27:20 +03002045}
2046
Al Viro666547f2014-04-06 14:03:05 -04002047static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002048 struct msghdr *msg_sys, unsigned int flags,
Tom Herbert28a94d82016-03-07 14:11:02 -08002049 struct used_address *used_address,
2050 unsigned int allowed_msghdr_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002052 struct compat_msghdr __user *msg_compat =
2053 (struct compat_msghdr __user *)msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002054 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002055 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07002056 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Amit Kushwaha846cc122016-12-08 18:21:53 +05302057 __aligned(sizeof(__kernel_size_t));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002058 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059 unsigned char *ctl_buf = ctl;
Al Virod8725c82014-12-11 00:02:50 -05002060 int ctl_len;
Al Viro08adb7d2014-11-10 20:23:13 -05002061 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002062
Al Viro08adb7d2014-11-10 20:23:13 -05002063 msg_sys->msg_name = &address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064
Al Viro08449322014-11-09 22:33:45 -05002065 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002066 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
Al Viro08449322014-11-09 22:33:45 -05002067 else
Al Viro08adb7d2014-11-10 20:23:13 -05002068 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002069 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04002070 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071
2072 err = -ENOBUFS;
2073
Anton Blanchard228e5482011-05-02 20:21:35 +00002074 if (msg_sys->msg_controllen > INT_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075 goto out_freeiov;
Tom Herbert28a94d82016-03-07 14:11:02 -08002076 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
Anton Blanchard228e5482011-05-02 20:21:35 +00002077 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002079 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00002080 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002081 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082 if (err)
2083 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00002084 ctl_buf = msg_sys->msg_control;
2085 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002086 } else if (ctl_len) {
David S. Millerac4340f2017-01-04 13:24:19 -05002087 BUILD_BUG_ON(sizeof(struct cmsghdr) !=
2088 CMSG_ALIGN(sizeof(struct cmsghdr)));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002089 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002091 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092 goto out_freeiov;
2093 }
2094 err = -EFAULT;
2095 /*
Anton Blanchard228e5482011-05-02 20:21:35 +00002096 * Careful! Before this, msg_sys->msg_control contains a user pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2098 * checking falls down on this.
2099 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00002100 if (copy_from_user(ctl_buf,
Anton Blanchard228e5482011-05-02 20:21:35 +00002101 (void __user __force *)msg_sys->msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002102 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00002104 msg_sys->msg_control = ctl_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 }
Anton Blanchard228e5482011-05-02 20:21:35 +00002106 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107
2108 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00002109 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002110 /*
2111 * If this is sendmmsg() and current destination address is same as
2112 * previously succeeded address, omit asking LSM's decision.
2113 * used_address->name_len is initialized to UINT_MAX so that the first
2114 * destination address never matches.
2115 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002116 if (used_address && msg_sys->msg_name &&
2117 used_address->name_len == msg_sys->msg_namelen &&
2118 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002119 used_address->name_len)) {
Al Virod8725c82014-12-11 00:02:50 -05002120 err = sock_sendmsg_nosec(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002121 goto out_freectl;
2122 }
Al Virod8725c82014-12-11 00:02:50 -05002123 err = sock_sendmsg(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002124 /*
2125 * If this is sendmmsg() and sending to current destination address was
2126 * successful, remember it.
2127 */
2128 if (used_address && err >= 0) {
2129 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002130 if (msg_sys->msg_name)
2131 memcpy(&used_address->name, msg_sys->msg_name,
2132 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002133 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134
2135out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002136 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002137 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2138out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04002139 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00002140 return err;
2141}
2142
2143/*
2144 * BSD sendmsg interface
2145 */
2146
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002147long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2148 bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002149{
2150 int fput_needed, err;
2151 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002152 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00002153
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002154 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2155 return -EINVAL;
2156
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002157 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00002158 if (!sock)
2159 goto out;
2160
Tom Herbert28a94d82016-03-07 14:11:02 -08002161 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
Anton Blanchard228e5482011-05-02 20:21:35 +00002162
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002163 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002164out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002165 return err;
2166}
2167
Al Viro666547f2014-04-06 14:03:05 -04002168SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002169{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002170 return __sys_sendmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002171}
2172
Anton Blanchard228e5482011-05-02 20:21:35 +00002173/*
2174 * Linux sendmmsg interface
2175 */
2176
2177int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002178 unsigned int flags, bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002179{
2180 int fput_needed, err, datagrams;
2181 struct socket *sock;
2182 struct mmsghdr __user *entry;
2183 struct compat_mmsghdr __user *compat_entry;
2184 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002185 struct used_address used_address;
Tom Herbertf0922762016-03-07 14:11:03 -08002186 unsigned int oflags = flags;
Anton Blanchard228e5482011-05-02 20:21:35 +00002187
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002188 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2189 return -EINVAL;
2190
Anton Blanchard98382f42011-08-04 14:07:39 +00002191 if (vlen > UIO_MAXIOV)
2192 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002193
2194 datagrams = 0;
2195
2196 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2197 if (!sock)
2198 return err;
2199
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002200 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002201 entry = mmsg;
2202 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002203 err = 0;
Tom Herbertf0922762016-03-07 14:11:03 -08002204 flags |= MSG_BATCH;
Anton Blanchard228e5482011-05-02 20:21:35 +00002205
2206 while (datagrams < vlen) {
Tom Herbertf0922762016-03-07 14:11:03 -08002207 if (datagrams == vlen - 1)
2208 flags = oflags;
2209
Anton Blanchard228e5482011-05-02 20:21:35 +00002210 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002211 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002212 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002213 if (err < 0)
2214 break;
2215 err = __put_user(err, &compat_entry->msg_len);
2216 ++compat_entry;
2217 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002218 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002219 (struct user_msghdr __user *)entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002220 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002221 if (err < 0)
2222 break;
2223 err = put_user(err, &entry->msg_len);
2224 ++entry;
2225 }
2226
2227 if (err)
2228 break;
2229 ++datagrams;
Soheil Hassas Yeganeh30238982016-11-04 15:36:49 -04002230 if (msg_data_left(&msg_sys))
2231 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002232 cond_resched();
Anton Blanchard228e5482011-05-02 20:21:35 +00002233 }
2234
Anton Blanchard228e5482011-05-02 20:21:35 +00002235 fput_light(sock->file, fput_needed);
2236
Anton Blanchard728ffb82011-08-04 14:07:38 +00002237 /* We only return an error if no datagrams were able to be sent */
2238 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002239 return datagrams;
2240
Anton Blanchard228e5482011-05-02 20:21:35 +00002241 return err;
2242}
2243
2244SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2245 unsigned int, vlen, unsigned int, flags)
2246{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002247 return __sys_sendmmsg(fd, mmsg, vlen, flags, true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002248}
2249
Al Viro666547f2014-04-06 14:03:05 -04002250static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002251 struct msghdr *msg_sys, unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002252{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002253 struct compat_msghdr __user *msg_compat =
2254 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002255 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002256 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002257 unsigned long cmsg_ptr;
Al Viro2da62902015-03-14 21:13:46 -04002258 int len;
Al Viro08adb7d2014-11-10 20:23:13 -05002259 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260
2261 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002262 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002263
2264 /* user mode address pointers */
2265 struct sockaddr __user *uaddr;
Al Viro08adb7d2014-11-10 20:23:13 -05002266 int __user *uaddr_len = COMPAT_NAMELEN(msg);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002267
Al Viro08adb7d2014-11-10 20:23:13 -05002268 msg_sys->msg_name = &addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002270 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002271 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002272 else
Al Viro08adb7d2014-11-10 20:23:13 -05002273 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002274 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04002275 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002276
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002277 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2278 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002279
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002280 /* We assume all kernel code knows the size of sockaddr_storage */
2281 msg_sys->msg_namelen = 0;
2282
Linus Torvalds1da177e2005-04-16 15:20:36 -07002283 if (sock->file->f_flags & O_NONBLOCK)
2284 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002285 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002286 if (err < 0)
2287 goto out_freeiov;
2288 len = err;
2289
2290 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002291 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002292 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002293 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002294 if (err < 0)
2295 goto out_freeiov;
2296 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002297 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f4212005-09-16 16:51:01 -07002298 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002299 if (err)
2300 goto out_freeiov;
2301 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002302 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303 &msg_compat->msg_controllen);
2304 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002305 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002306 &msg->msg_controllen);
2307 if (err)
2308 goto out_freeiov;
2309 err = len;
2310
2311out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04002312 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002313 return err;
2314}
2315
2316/*
2317 * BSD recvmsg interface
2318 */
2319
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002320long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2321 bool forbid_cmsg_compat)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002322{
2323 int fput_needed, err;
2324 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002325 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002326
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002327 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2328 return -EINVAL;
2329
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002330 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002331 if (!sock)
2332 goto out;
2333
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002334 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002335
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002336 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002337out:
2338 return err;
2339}
2340
Al Viro666547f2014-04-06 14:03:05 -04002341SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002342 unsigned int, flags)
2343{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002344 return __sys_recvmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002345}
2346
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002347/*
2348 * Linux recvmmsg interface
2349 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002350
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002351int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2352 unsigned int flags, struct timespec *timeout)
2353{
2354 int fput_needed, err, datagrams;
2355 struct socket *sock;
2356 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002357 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002358 struct msghdr msg_sys;
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002359 struct timespec64 end_time;
2360 struct timespec64 timeout64;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002361
2362 if (timeout &&
2363 poll_select_set_timeout(&end_time, timeout->tv_sec,
2364 timeout->tv_nsec))
2365 return -EINVAL;
2366
2367 datagrams = 0;
2368
2369 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2370 if (!sock)
2371 return err;
2372
Soheil Hassas Yeganeh7797dc42018-02-27 18:22:40 -05002373 if (likely(!(flags & MSG_ERRQUEUE))) {
2374 err = sock_error(sock->sk);
2375 if (err) {
2376 datagrams = err;
2377 goto out_put;
2378 }
Maxime Jayate623a9e2017-02-21 18:35:51 +01002379 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002380
2381 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002382 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002383
2384 while (datagrams < vlen) {
2385 /*
2386 * No need to ask LSM for more than the first datagram.
2387 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002388 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002389 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002390 &msg_sys, flags & ~MSG_WAITFORONE,
2391 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002392 if (err < 0)
2393 break;
2394 err = __put_user(err, &compat_entry->msg_len);
2395 ++compat_entry;
2396 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002397 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002398 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002399 &msg_sys, flags & ~MSG_WAITFORONE,
2400 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002401 if (err < 0)
2402 break;
2403 err = put_user(err, &entry->msg_len);
2404 ++entry;
2405 }
2406
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002407 if (err)
2408 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002409 ++datagrams;
2410
Brandon L Black71c5c1592010-03-26 16:18:03 +00002411 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2412 if (flags & MSG_WAITFORONE)
2413 flags |= MSG_DONTWAIT;
2414
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002415 if (timeout) {
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002416 ktime_get_ts64(&timeout64);
2417 *timeout = timespec64_to_timespec(
2418 timespec64_sub(end_time, timeout64));
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002419 if (timeout->tv_sec < 0) {
2420 timeout->tv_sec = timeout->tv_nsec = 0;
2421 break;
2422 }
2423
2424 /* Timeout, return less than vlen datagrams */
2425 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2426 break;
2427 }
2428
2429 /* Out of band data, return right away */
2430 if (msg_sys.msg_flags & MSG_OOB)
2431 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002432 cond_resched();
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002433 }
2434
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002435 if (err == 0)
2436 goto out_put;
2437
2438 if (datagrams == 0) {
2439 datagrams = err;
2440 goto out_put;
2441 }
2442
2443 /*
2444 * We may return less entries than requested (vlen) if the
2445 * sock is non block and there aren't enough datagrams...
2446 */
2447 if (err != -EAGAIN) {
2448 /*
2449 * ... or if recvmsg returns an error after we
2450 * received some datagrams, where we record the
2451 * error to return on the next call or if the
2452 * app asks about it using getsockopt(SO_ERROR).
2453 */
2454 sock->sk->sk_err = -err;
2455 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002456out_put:
2457 fput_light(sock->file, fput_needed);
2458
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002459 return datagrams;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002460}
2461
Dominik Brodowski1255e262018-03-13 20:44:21 +01002462static int do_sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2463 unsigned int vlen, unsigned int flags,
2464 struct timespec __user *timeout)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002465{
2466 int datagrams;
2467 struct timespec timeout_sys;
2468
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002469 if (flags & MSG_CMSG_COMPAT)
2470 return -EINVAL;
2471
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002472 if (!timeout)
2473 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2474
2475 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2476 return -EFAULT;
2477
2478 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2479
2480 if (datagrams > 0 &&
2481 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2482 datagrams = -EFAULT;
2483
2484 return datagrams;
2485}
2486
Dominik Brodowski1255e262018-03-13 20:44:21 +01002487SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2488 unsigned int, vlen, unsigned int, flags,
2489 struct timespec __user *, timeout)
2490{
2491 return do_sys_recvmmsg(fd, mmsg, vlen, flags, timeout);
2492}
2493
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002494#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002495/* Argument list sizes for sys_socketcall */
2496#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002497static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002498 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2499 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2500 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002501 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002502};
2503
Linus Torvalds1da177e2005-04-16 15:20:36 -07002504#undef AL
2505
2506/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002507 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002508 *
2509 * Argument checking cleaned up. Saved 20% in size.
2510 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002511 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002512 */
2513
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002514SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515{
Chen Gang2950fa92013-04-07 16:55:23 +08002516 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002517 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002518 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002519 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002520
Anton Blanchard228e5482011-05-02 20:21:35 +00002521 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002522 return -EINVAL;
2523
Arjan van de Ven47379052009-09-28 12:57:44 -07002524 len = nargs[call];
2525 if (len > sizeof(a))
2526 return -EINVAL;
2527
Linus Torvalds1da177e2005-04-16 15:20:36 -07002528 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002529 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002530 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002531
Chen Gang2950fa92013-04-07 16:55:23 +08002532 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2533 if (err)
2534 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002535
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002536 a0 = a[0];
2537 a1 = a[1];
2538
2539 switch (call) {
2540 case SYS_SOCKET:
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01002541 err = __sys_socket(a0, a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002542 break;
2543 case SYS_BIND:
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01002544 err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002545 break;
2546 case SYS_CONNECT:
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01002547 err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002548 break;
2549 case SYS_LISTEN:
Dominik Brodowski25e290e2018-03-13 19:36:54 +01002550 err = __sys_listen(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002551 break;
2552 case SYS_ACCEPT:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002553 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2554 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002555 break;
2556 case SYS_GETSOCKNAME:
2557 err =
Dominik Brodowski8882a102018-03-13 19:43:14 +01002558 __sys_getsockname(a0, (struct sockaddr __user *)a1,
2559 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002560 break;
2561 case SYS_GETPEERNAME:
2562 err =
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01002563 __sys_getpeername(a0, (struct sockaddr __user *)a1,
2564 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002565 break;
2566 case SYS_SOCKETPAIR:
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01002567 err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002568 break;
2569 case SYS_SEND:
Dominik Brodowskif3bf8962018-03-13 19:52:00 +01002570 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2571 NULL, 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002572 break;
2573 case SYS_SENDTO:
Dominik Brodowski211b6342018-03-13 19:18:52 +01002574 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2575 (struct sockaddr __user *)a[4], a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002576 break;
2577 case SYS_RECV:
Dominik Brodowskid27e9af2018-03-13 19:54:17 +01002578 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2579 NULL, NULL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002580 break;
2581 case SYS_RECVFROM:
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002582 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2583 (struct sockaddr __user *)a[4],
2584 (int __user *)a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002585 break;
2586 case SYS_SHUTDOWN:
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002587 err = __sys_shutdown(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002588 break;
2589 case SYS_SETSOCKOPT:
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002590 err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3],
2591 a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002592 break;
2593 case SYS_GETSOCKOPT:
2594 err =
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002595 __sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2596 (int __user *)a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002597 break;
2598 case SYS_SENDMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002599 err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1,
2600 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002601 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002602 case SYS_SENDMMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002603 err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2],
2604 a[3], true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002605 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002606 case SYS_RECVMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002607 err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1,
2608 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002609 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002610 case SYS_RECVMMSG:
Dominik Brodowski1255e262018-03-13 20:44:21 +01002611 err = do_sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2],
2612 a[3], (struct timespec __user *)a[4]);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002613 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002614 case SYS_ACCEPT4:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002615 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2616 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002617 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002618 default:
2619 err = -EINVAL;
2620 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002621 }
2622 return err;
2623}
2624
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002625#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002626
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002627/**
2628 * sock_register - add a socket protocol handler
2629 * @ops: description of protocol
2630 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002631 * This function is called by a protocol handler that wants to
2632 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09002633 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002634 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002635 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002636int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002637{
2638 int err;
2639
2640 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08002641 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002642 return -ENOBUFS;
2643 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002644
2645 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002646 if (rcu_dereference_protected(net_families[ops->family],
2647 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002648 err = -EEXIST;
2649 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00002650 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651 err = 0;
2652 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002653 spin_unlock(&net_family_lock);
2654
Yang Yingliang3410f222014-02-12 17:09:55 +08002655 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002656 return err;
2657}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002658EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002659
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002660/**
2661 * sock_unregister - remove a protocol handler
2662 * @family: protocol family to remove
2663 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002664 * This function is called by a protocol handler that wants to
2665 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002666 * new socket creation.
2667 *
2668 * If protocol handler is a module, then it can use module reference
2669 * counts to protect against new references. If protocol handler is not
2670 * a module then it needs to provide its own protection in
2671 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002672 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002673void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002675 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002676
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002677 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00002678 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002679 spin_unlock(&net_family_lock);
2680
2681 synchronize_rcu();
2682
Yang Yingliang3410f222014-02-12 17:09:55 +08002683 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002684}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002685EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002686
Xin Longbf2ae2e2018-03-10 18:57:50 +08002687bool sock_is_registered(int family)
2688{
2689 return family < NPROTO && rcu_access_pointer(net_families[family]);
2690}
2691
Andi Kleen77d76ea2005-12-22 12:43:42 -08002692static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693{
Nick Pigginb3e19d92011-01-07 17:50:11 +11002694 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00002695 /*
2696 * Initialize the network sysctl infrastructure.
2697 */
2698 err = net_sysctl_init();
2699 if (err)
2700 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11002701
Linus Torvalds1da177e2005-04-16 15:20:36 -07002702 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002703 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002704 */
2705 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002706
2707 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002708 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002709 */
2710
2711 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11002712
2713 err = register_filesystem(&sock_fs_type);
2714 if (err)
2715 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002716 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11002717 if (IS_ERR(sock_mnt)) {
2718 err = PTR_ERR(sock_mnt);
2719 goto out_mount;
2720 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08002721
2722 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002723 */
2724
2725#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00002726 err = netfilter_init();
2727 if (err)
2728 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002729#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002730
Daniel Borkmann408eccc2014-04-01 16:20:23 +02002731 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00002732
Nick Pigginb3e19d92011-01-07 17:50:11 +11002733out:
2734 return err;
2735
2736out_mount:
2737 unregister_filesystem(&sock_fs_type);
2738out_fs:
2739 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002740}
2741
Andi Kleen77d76ea2005-12-22 12:43:42 -08002742core_initcall(sock_init); /* early initcall */
2743
Linus Torvalds1da177e2005-04-16 15:20:36 -07002744#ifdef CONFIG_PROC_FS
2745void socket_seq_show(struct seq_file *seq)
2746{
Tonghao Zhang648845a2017-12-14 05:51:58 -08002747 seq_printf(seq, "sockets: used %d\n",
2748 sock_inuse_get(seq->private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002749}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002750#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002751
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002752#ifdef CONFIG_COMPAT
Arnd Bergmann6b960182009-11-06 23:10:54 -08002753static int do_siocgstamp(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002754 unsigned int cmd, void __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002755{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002756 mm_segment_t old_fs = get_fs();
2757 struct timeval ktv;
2758 int err;
2759
2760 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002761 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002762 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002763 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002764 err = compat_put_timeval(&ktv, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002765
Arnd Bergmann7a229382009-11-06 23:00:29 -08002766 return err;
2767}
2768
Arnd Bergmann6b960182009-11-06 23:10:54 -08002769static int do_siocgstampns(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002770 unsigned int cmd, void __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002771{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002772 mm_segment_t old_fs = get_fs();
2773 struct timespec kts;
2774 int err;
2775
2776 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002777 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002778 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002779 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002780 err = compat_put_timespec(&kts, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002781
Arnd Bergmann7a229382009-11-06 23:00:29 -08002782 return err;
2783}
2784
Al Viro36fd6332017-06-26 13:19:16 -04002785static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002786{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002787 struct compat_ifconf ifc32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002788 struct ifconf ifc;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002789 int err;
2790
Arnd Bergmann6b960182009-11-06 23:10:54 -08002791 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002792 return -EFAULT;
2793
Al Viro36fd6332017-06-26 13:19:16 -04002794 ifc.ifc_len = ifc32.ifc_len;
2795 ifc.ifc_req = compat_ptr(ifc32.ifcbuf);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002796
Al Viro36fd6332017-06-26 13:19:16 -04002797 rtnl_lock();
2798 err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq));
2799 rtnl_unlock();
Arnd Bergmann7a229382009-11-06 23:00:29 -08002800 if (err)
2801 return err;
2802
Al Viro36fd6332017-06-26 13:19:16 -04002803 ifc32.ifc_len = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002804 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002805 return -EFAULT;
2806
2807 return 0;
2808}
2809
Arnd Bergmann6b960182009-11-06 23:10:54 -08002810static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002811{
Ben Hutchings3a7da392011-03-17 07:34:32 +00002812 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2813 bool convert_in = false, convert_out = false;
Al Viro44c02a22017-10-05 12:59:44 -04002814 size_t buf_size = 0;
2815 struct ethtool_rxnfc __user *rxnfc = NULL;
2816 struct ifreq ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002817 u32 rule_cnt = 0, actual_rule_cnt;
2818 u32 ethcmd;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002819 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002820 int ret;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002821
2822 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2823 return -EFAULT;
2824
Ben Hutchings3a7da392011-03-17 07:34:32 +00002825 compat_rxnfc = compat_ptr(data);
2826
2827 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002828 return -EFAULT;
2829
Ben Hutchings3a7da392011-03-17 07:34:32 +00002830 /* Most ethtool structures are defined without padding.
2831 * Unfortunately struct ethtool_rxnfc is an exception.
2832 */
2833 switch (ethcmd) {
2834 default:
2835 break;
2836 case ETHTOOL_GRXCLSRLALL:
2837 /* Buffer size is variable */
2838 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2839 return -EFAULT;
2840 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2841 return -ENOMEM;
2842 buf_size += rule_cnt * sizeof(u32);
2843 /* fall through */
2844 case ETHTOOL_GRXRINGS:
2845 case ETHTOOL_GRXCLSRLCNT:
2846 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00002847 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002848 convert_out = true;
2849 /* fall through */
2850 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002851 buf_size += sizeof(struct ethtool_rxnfc);
2852 convert_in = true;
Al Viro44c02a22017-10-05 12:59:44 -04002853 rxnfc = compat_alloc_user_space(buf_size);
Ben Hutchings3a7da392011-03-17 07:34:32 +00002854 break;
2855 }
2856
Al Viro44c02a22017-10-05 12:59:44 -04002857 if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ))
Ben Hutchings3a7da392011-03-17 07:34:32 +00002858 return -EFAULT;
2859
Al Viro44c02a22017-10-05 12:59:44 -04002860 ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002861
2862 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00002863 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00002864 * fs.ring_cookie and at the end of fs, but nowhere else.
2865 */
Alexander Duyck127fe532011-04-08 18:01:59 +00002866 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2867 sizeof(compat_rxnfc->fs.m_ext) !=
2868 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2869 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00002870 BUILD_BUG_ON(
2871 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2872 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2873 offsetof(struct ethtool_rxnfc, fs.location) -
2874 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2875
2876 if (copy_in_user(rxnfc, compat_rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002877 (void __user *)(&rxnfc->fs.m_ext + 1) -
2878 (void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002879 copy_in_user(&rxnfc->fs.ring_cookie,
2880 &compat_rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002881 (void __user *)(&rxnfc->fs.location + 1) -
2882 (void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002883 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2884 sizeof(rxnfc->rule_cnt)))
2885 return -EFAULT;
2886 }
2887
Al Viro44c02a22017-10-05 12:59:44 -04002888 ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL);
Ben Hutchings3a7da392011-03-17 07:34:32 +00002889 if (ret)
2890 return ret;
2891
2892 if (convert_out) {
2893 if (copy_in_user(compat_rxnfc, rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002894 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2895 (const void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002896 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2897 &rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002898 (const void __user *)(&rxnfc->fs.location + 1) -
2899 (const void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002900 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2901 sizeof(rxnfc->rule_cnt)))
2902 return -EFAULT;
2903
2904 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2905 /* As an optimisation, we only copy the actual
2906 * number of rules that the underlying
2907 * function returned. Since Mallory might
2908 * change the rule count in user memory, we
2909 * check that it is less than the rule count
2910 * originally given (as the user buffer size),
2911 * which has been range-checked.
2912 */
2913 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2914 return -EFAULT;
2915 if (actual_rule_cnt < rule_cnt)
2916 rule_cnt = actual_rule_cnt;
2917 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2918 &rxnfc->rule_locs[0],
2919 rule_cnt * sizeof(u32)))
2920 return -EFAULT;
2921 }
2922 }
2923
2924 return 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002925}
2926
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002927static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2928{
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002929 compat_uptr_t uptr32;
Al Viro44c02a22017-10-05 12:59:44 -04002930 struct ifreq ifr;
2931 void __user *saved;
2932 int err;
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002933
Al Viro44c02a22017-10-05 12:59:44 -04002934 if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002935 return -EFAULT;
2936
2937 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2938 return -EFAULT;
2939
Al Viro44c02a22017-10-05 12:59:44 -04002940 saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc;
2941 ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002942
Al Viro44c02a22017-10-05 12:59:44 -04002943 err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL);
2944 if (!err) {
2945 ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved;
2946 if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq)))
2947 err = -EFAULT;
Joe Perchesccbd6a52010-05-14 10:58:26 +00002948 }
Al Viro44c02a22017-10-05 12:59:44 -04002949 return err;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002950}
2951
Ben Hutchings590d4692013-11-18 17:04:13 +00002952/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
2953static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08002954 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002955{
Al Viro44c02a22017-10-05 12:59:44 -04002956 struct ifreq ifreq;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002957 u32 data32;
2958
Al Viro44c02a22017-10-05 12:59:44 -04002959 if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002960 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04002961 if (get_user(data32, &u_ifreq32->ifr_data))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002962 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04002963 ifreq.ifr_data = compat_ptr(data32);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002964
Al Viro44c02a22017-10-05 12:59:44 -04002965 return dev_ioctl(net, cmd, &ifreq, NULL);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002966}
2967
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002968static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2969 struct compat_ifreq __user *uifr32)
2970{
2971 struct ifreq ifr;
2972 struct compat_ifmap __user *uifmap32;
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002973 int err;
2974
2975 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2976 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002977 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2978 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2979 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2980 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
2981 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
2982 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002983 if (err)
2984 return -EFAULT;
2985
Al Viro44c02a22017-10-05 12:59:44 -04002986 err = dev_ioctl(net, cmd, &ifr, NULL);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002987
2988 if (cmd == SIOCGIFMAP && !err) {
2989 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002990 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2991 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2992 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2993 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
2994 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
2995 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002996 if (err)
2997 err = -EFAULT;
2998 }
2999 return err;
3000}
3001
Arnd Bergmann7a229382009-11-06 23:00:29 -08003002struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003003 u32 rt_pad1;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003004 struct sockaddr rt_dst; /* target address */
3005 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3006 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003007 unsigned short rt_flags;
3008 short rt_pad2;
3009 u32 rt_pad3;
3010 unsigned char rt_tos;
3011 unsigned char rt_class;
3012 short rt_pad4;
3013 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003014 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003015 u32 rt_mtu; /* per route MTU/Window */
3016 u32 rt_window; /* Window clamping */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003017 unsigned short rt_irtt; /* Initial RTT */
3018};
3019
3020struct in6_rtmsg32 {
3021 struct in6_addr rtmsg_dst;
3022 struct in6_addr rtmsg_src;
3023 struct in6_addr rtmsg_gateway;
3024 u32 rtmsg_type;
3025 u16 rtmsg_dst_len;
3026 u16 rtmsg_src_len;
3027 u32 rtmsg_metric;
3028 u32 rtmsg_info;
3029 u32 rtmsg_flags;
3030 s32 rtmsg_ifindex;
3031};
3032
Arnd Bergmann6b960182009-11-06 23:10:54 -08003033static int routing_ioctl(struct net *net, struct socket *sock,
3034 unsigned int cmd, void __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003035{
3036 int ret;
3037 void *r = NULL;
3038 struct in6_rtmsg r6;
3039 struct rtentry r4;
3040 char devname[16];
3041 u32 rtdev;
3042 mm_segment_t old_fs = get_fs();
3043
Arnd Bergmann6b960182009-11-06 23:10:54 -08003044 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3045 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003046 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003047 3 * sizeof(struct in6_addr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003048 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3049 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3050 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3051 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3052 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3053 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3054 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003055
3056 r = (void *) &r6;
3057 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003058 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003059 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003060 3 * sizeof(struct sockaddr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003061 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3062 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3063 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3064 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3065 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3066 ret |= get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003067 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003068 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003069 r4.rt_dev = (char __user __force *)devname;
3070 devname[15] = 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003071 } else
3072 r4.rt_dev = NULL;
3073
3074 r = (void *) &r4;
3075 }
3076
3077 if (ret) {
3078 ret = -EFAULT;
3079 goto out;
3080 }
3081
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003082 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003083 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003084 set_fs(old_fs);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003085
3086out:
Arnd Bergmann7a229382009-11-06 23:00:29 -08003087 return ret;
3088}
3089
3090/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3091 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003092 * use compatible ioctls
Arnd Bergmann7a229382009-11-06 23:00:29 -08003093 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003094static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003095{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003096 compat_ulong_t tmp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003097
Arnd Bergmann6b960182009-11-06 23:10:54 -08003098 if (get_user(tmp, argp))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003099 return -EFAULT;
3100 if (tmp == BRCTL_GET_VERSION)
3101 return BRCTL_VERSION + 1;
3102 return -EINVAL;
3103}
3104
Arnd Bergmann6b960182009-11-06 23:10:54 -08003105static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3106 unsigned int cmd, unsigned long arg)
3107{
3108 void __user *argp = compat_ptr(arg);
3109 struct sock *sk = sock->sk;
3110 struct net *net = sock_net(sk);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003111
Arnd Bergmann6b960182009-11-06 23:10:54 -08003112 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003113 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003114
Arnd Bergmann6b960182009-11-06 23:10:54 -08003115 switch (cmd) {
3116 case SIOCSIFBR:
3117 case SIOCGIFBR:
3118 return old_bridge_ioctl(argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003119 case SIOCGIFCONF:
Al Viro36fd6332017-06-26 13:19:16 -04003120 return compat_dev_ifconf(net, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003121 case SIOCETHTOOL:
3122 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003123 case SIOCWANDEV:
3124 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003125 case SIOCGIFMAP:
3126 case SIOCSIFMAP:
3127 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003128 case SIOCADDRT:
3129 case SIOCDELRT:
3130 return routing_ioctl(net, sock, cmd, argp);
3131 case SIOCGSTAMP:
3132 return do_siocgstamp(net, sock, cmd, argp);
3133 case SIOCGSTAMPNS:
3134 return do_siocgstampns(net, sock, cmd, argp);
Ben Hutchings590d4692013-11-18 17:04:13 +00003135 case SIOCBONDSLAVEINFOQUERY:
3136 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003137 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003138 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003139 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003140
Arnd Bergmann6b960182009-11-06 23:10:54 -08003141 case FIOSETOWN:
3142 case SIOCSPGRP:
3143 case FIOGETOWN:
3144 case SIOCGPGRP:
3145 case SIOCBRADDBR:
3146 case SIOCBRDELBR:
3147 case SIOCGIFVLAN:
3148 case SIOCSIFVLAN:
3149 case SIOCADDDLCI:
3150 case SIOCDELDLCI:
Andrey Vaginc62cce22016-10-24 18:29:13 -07003151 case SIOCGSKNS:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003152 return sock_ioctl(file, cmd, arg);
3153
3154 case SIOCGIFFLAGS:
3155 case SIOCSIFFLAGS:
3156 case SIOCGIFMETRIC:
3157 case SIOCSIFMETRIC:
3158 case SIOCGIFMTU:
3159 case SIOCSIFMTU:
3160 case SIOCGIFMEM:
3161 case SIOCSIFMEM:
3162 case SIOCGIFHWADDR:
3163 case SIOCSIFHWADDR:
3164 case SIOCADDMULTI:
3165 case SIOCDELMULTI:
3166 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003167 case SIOCGIFADDR:
3168 case SIOCSIFADDR:
3169 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003170 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003171 case SIOCGIFBRDADDR:
3172 case SIOCSIFBRDADDR:
3173 case SIOCGIFDSTADDR:
3174 case SIOCSIFDSTADDR:
3175 case SIOCGIFNETMASK:
3176 case SIOCSIFNETMASK:
3177 case SIOCSIFPFLAGS:
3178 case SIOCGIFPFLAGS:
3179 case SIOCGIFTXQLEN:
3180 case SIOCSIFTXQLEN:
3181 case SIOCBRADDIF:
3182 case SIOCBRDELIF:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003183 case SIOCSIFNAME:
3184 case SIOCGMIIPHY:
3185 case SIOCGMIIREG:
3186 case SIOCSMIIREG:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003187 case SIOCSARP:
3188 case SIOCGARP:
3189 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003190 case SIOCATMARK:
Al Virof92d4fc2017-09-30 19:32:17 -04003191 case SIOCBONDENSLAVE:
3192 case SIOCBONDRELEASE:
3193 case SIOCBONDSETHWADDR:
3194 case SIOCBONDCHANGEACTIVE:
Al Viro4cf808e72017-10-01 21:12:09 -04003195 case SIOCGIFNAME:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003196 return sock_do_ioctl(net, sock, cmd, arg);
3197 }
3198
Arnd Bergmann6b960182009-11-06 23:10:54 -08003199 return -ENOIOCTLCMD;
3200}
Arnd Bergmann7a229382009-11-06 23:00:29 -08003201
Eric Dumazet95c96172012-04-15 05:58:06 +00003202static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003203 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003204{
3205 struct socket *sock = file->private_data;
3206 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003207 struct sock *sk;
3208 struct net *net;
3209
3210 sk = sock->sk;
3211 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003212
3213 if (sock->ops->compat_ioctl)
3214 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3215
David S. Miller87de87d2008-06-03 09:14:03 -07003216 if (ret == -ENOIOCTLCMD &&
3217 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3218 ret = compat_wext_handle_ioctl(net, cmd, arg);
3219
Arnd Bergmann6b960182009-11-06 23:10:54 -08003220 if (ret == -ENOIOCTLCMD)
3221 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3222
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003223 return ret;
3224}
3225#endif
3226
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003227int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3228{
3229 return sock->ops->bind(sock, addr, addrlen);
3230}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003231EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003232
3233int kernel_listen(struct socket *sock, int backlog)
3234{
3235 return sock->ops->listen(sock, backlog);
3236}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003237EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003238
3239int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3240{
3241 struct sock *sk = sock->sk;
3242 int err;
3243
3244 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3245 newsock);
3246 if (err < 0)
3247 goto done;
3248
David Howellscdfbabf2017-03-09 08:09:05 +00003249 err = sock->ops->accept(sock, *newsock, flags, true);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003250 if (err < 0) {
3251 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003252 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003253 goto done;
3254 }
3255
3256 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003257 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003258
3259done:
3260 return err;
3261}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003262EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003263
3264int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003265 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003266{
3267 return sock->ops->connect(sock, addr, addrlen, flags);
3268}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003269EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003270
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003271int kernel_getsockname(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003272{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003273 return sock->ops->getname(sock, addr, 0);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003274}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003275EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003276
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003277int kernel_getpeername(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003278{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003279 return sock->ops->getname(sock, addr, 1);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003280}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003281EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003282
3283int kernel_getsockopt(struct socket *sock, int level, int optname,
3284 char *optval, int *optlen)
3285{
3286 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003287 char __user *uoptval;
3288 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003289 int err;
3290
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003291 uoptval = (char __user __force *) optval;
3292 uoptlen = (int __user __force *) optlen;
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_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003297 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003298 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3299 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003300 set_fs(oldfs);
3301 return err;
3302}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003303EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003304
3305int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003306 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003307{
3308 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003309 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003310 int err;
3311
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003312 uoptval = (char __user __force *) optval;
3313
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003314 set_fs(KERNEL_DS);
3315 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003316 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003317 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003318 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003319 optlen);
3320 set_fs(oldfs);
3321 return err;
3322}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003323EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003324
3325int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3326 size_t size, int flags)
3327{
3328 if (sock->ops->sendpage)
3329 return sock->ops->sendpage(sock, page, offset, size, flags);
3330
3331 return sock_no_sendpage(sock, page, offset, size, flags);
3332}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003333EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003334
Tom Herbert306b13e2017-07-28 16:22:41 -07003335int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
3336 size_t size, int flags)
3337{
3338 struct socket *sock = sk->sk_socket;
3339
3340 if (sock->ops->sendpage_locked)
3341 return sock->ops->sendpage_locked(sk, page, offset, size,
3342 flags);
3343
3344 return sock_no_sendpage_locked(sk, page, offset, size, flags);
3345}
3346EXPORT_SYMBOL(kernel_sendpage_locked);
3347
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003348int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3349{
3350 return sock->ops->shutdown(sock, how);
3351}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003352EXPORT_SYMBOL(kernel_sock_shutdown);
R. Parameswaran113c3072017-04-05 16:50:35 -07003353
3354/* This routine returns the IP overhead imposed by a socket i.e.
3355 * the length of the underlying IP header, depending on whether
3356 * this is an IPv4 or IPv6 socket and the length from IP options turned
R. Parameswaran57240d02017-04-12 18:31:04 -07003357 * on at the socket. Assumes that the caller has a lock on the socket.
R. Parameswaran113c3072017-04-05 16:50:35 -07003358 */
3359u32 kernel_sock_ip_overhead(struct sock *sk)
3360{
3361 struct inet_sock *inet;
3362 struct ip_options_rcu *opt;
3363 u32 overhead = 0;
R. Parameswaran113c3072017-04-05 16:50:35 -07003364#if IS_ENABLED(CONFIG_IPV6)
3365 struct ipv6_pinfo *np;
3366 struct ipv6_txoptions *optv6 = NULL;
3367#endif /* IS_ENABLED(CONFIG_IPV6) */
3368
3369 if (!sk)
3370 return overhead;
3371
R. Parameswaran113c3072017-04-05 16:50:35 -07003372 switch (sk->sk_family) {
3373 case AF_INET:
3374 inet = inet_sk(sk);
3375 overhead += sizeof(struct iphdr);
3376 opt = rcu_dereference_protected(inet->inet_opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003377 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003378 if (opt)
3379 overhead += opt->opt.optlen;
3380 return overhead;
3381#if IS_ENABLED(CONFIG_IPV6)
3382 case AF_INET6:
3383 np = inet6_sk(sk);
3384 overhead += sizeof(struct ipv6hdr);
3385 if (np)
3386 optv6 = rcu_dereference_protected(np->opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003387 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003388 if (optv6)
3389 overhead += (optv6->opt_flen + optv6->opt_nflen);
3390 return overhead;
3391#endif /* IS_ENABLED(CONFIG_IPV6) */
3392 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
3393 return overhead;
3394 }
3395}
3396EXPORT_SYMBOL(kernel_sock_ip_overhead);