blob: 475247e347aeb25760e6e07a164da95c184342ed [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;
Christoph Hellwige6476c22018-07-30 09:45:07 +0200254 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;
268
269 ei = container_of(inode, struct socket_alloc, vfs_inode);
Christoph Hellwige6476c22018-07-30 09:45:07 +0200270 kfree_rcu(ei->socket.wq, rcu);
Eric Dumazet43815482010-04-29 11:01:49 +0000271 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272}
273
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700274static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700276 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Christoph Lametera35afb82007-05-16 22:10:57 -0700278 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700280
yuan linyu1e911632017-01-07 17:18:31 +0800281static void init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282{
283 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700284 sizeof(struct socket_alloc),
285 0,
286 (SLAB_HWCACHE_ALIGN |
287 SLAB_RECLAIM_ACCOUNT |
Vladimir Davydov5d097052016-01-14 15:18:21 -0800288 SLAB_MEM_SPREAD | SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +0900289 init_once);
yuan linyu1e911632017-01-07 17:18:31 +0800290 BUG_ON(sock_inode_cachep == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291}
292
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700293static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700294 .alloc_inode = sock_alloc_inode,
295 .destroy_inode = sock_destroy_inode,
296 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297};
298
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700299/*
300 * sockfs_dname() is called from d_path().
301 */
302static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
303{
304 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
David Howellsc5ef6032015-03-17 22:26:16 +0000305 d_inode(dentry)->i_ino);
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700306}
307
Al Viro3ba13d12009-02-20 06:02:22 +0000308static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700309 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310};
311
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200312static int sockfs_xattr_get(const struct xattr_handler *handler,
313 struct dentry *dentry, struct inode *inode,
314 const char *suffix, void *value, size_t size)
315{
316 if (value) {
317 if (dentry->d_name.len + 1 > size)
318 return -ERANGE;
319 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
320 }
321 return dentry->d_name.len + 1;
322}
323
324#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
325#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
326#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
327
328static const struct xattr_handler sockfs_xattr_handler = {
329 .name = XATTR_NAME_SOCKPROTONAME,
330 .get = sockfs_xattr_get,
331};
332
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100333static int sockfs_security_xattr_set(const struct xattr_handler *handler,
334 struct dentry *dentry, struct inode *inode,
335 const char *suffix, const void *value,
336 size_t size, int flags)
337{
338 /* Handled by LSM. */
339 return -EAGAIN;
340}
341
342static const struct xattr_handler sockfs_security_xattr_handler = {
343 .prefix = XATTR_SECURITY_PREFIX,
344 .set = sockfs_security_xattr_set,
345};
346
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200347static const struct xattr_handler *sockfs_xattr_handlers[] = {
348 &sockfs_xattr_handler,
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100349 &sockfs_security_xattr_handler,
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200350 NULL
351};
352
Al Viroc74a1cb2011-01-12 16:59:34 -0500353static struct dentry *sockfs_mount(struct file_system_type *fs_type,
354 int flags, const char *dev_name, void *data)
355{
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200356 return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops,
357 sockfs_xattr_handlers,
358 &sockfs_dentry_operations, SOCKFS_MAGIC);
Al Viroc74a1cb2011-01-12 16:59:34 -0500359}
360
361static struct vfsmount *sock_mnt __read_mostly;
362
363static struct file_system_type sock_fs_type = {
364 .name = "sockfs",
365 .mount = sockfs_mount,
366 .kill_sb = kill_anon_super,
367};
368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369/*
370 * Obtains the first available file descriptor and sets it up for use.
371 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800372 * These functions create file structures and maps them to fd space
373 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 * and file struct implicitly stored in sock->file.
375 * Note that another thread may close file descriptor before we return
376 * from this function. We use the fact that now we do not refer
377 * to socket after mapping. If one day we will need it, this
378 * function will increment ref. count on file by 1.
379 *
380 * In any case returned fd MAY BE not valid!
381 * This race condition is unavoidable
382 * with shared fd spaces, we cannot solve it inside kernel,
383 * but we take care of internal coherence yet.
384 */
385
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700386struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
Al Viro7cbe66b2009-08-05 19:59:08 +0400388 struct qstr name = { .name = "" };
Al Viro2c48b9c2009-08-09 00:52:35 +0400389 struct path path;
Al Viro7cbe66b2009-08-05 19:59:08 +0400390 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800391
Masatake YAMATO600e1772012-08-29 10:44:29 +0000392 if (dname) {
393 name.name = dname;
394 name.len = strlen(name.name);
395 } else if (sock->sk) {
396 name.name = sock->sk->sk_prot_creator->name;
397 name.len = strlen(name.name);
398 }
Nick Piggin4b936882011-01-07 17:50:07 +1100399 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
Al Viro8e1611e2017-12-05 23:29:09 +0000400 if (unlikely(!path.dentry)) {
401 sock_release(sock);
Al Viro28407632012-08-17 23:54:15 -0400402 return ERR_PTR(-ENOMEM);
Al Viro8e1611e2017-12-05 23:29:09 +0000403 }
Al Viro2c48b9c2009-08-09 00:52:35 +0400404 path.mnt = mntget(sock_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
Al Viro2c48b9c2009-08-09 00:52:35 +0400406 d_instantiate(path.dentry, SOCK_INODE(sock));
Al Virocc3808f2009-08-06 09:43:59 +0400407
Al Viro2c48b9c2009-08-09 00:52:35 +0400408 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
Al Virocc3808f2009-08-06 09:43:59 +0400409 &socket_file_ops);
Viresh Kumarb5ffe632015-08-12 15:59:47 +0530410 if (IS_ERR(file)) {
Al Viro8e1611e2017-12-05 23:29:09 +0000411 /* drop dentry, keep inode for a bit */
David Howellsc5ef6032015-03-17 22:26:16 +0000412 ihold(d_inode(path.dentry));
Al Viro2c48b9c2009-08-09 00:52:35 +0400413 path_put(&path);
Al Viro8e1611e2017-12-05 23:29:09 +0000414 /* ... and now kill it properly */
415 sock_release(sock);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700416 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400417 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800418
419 sock->file = file;
Ulrich Drepper77d27202008-07-23 21:29:35 -0700420 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800421 file->private_data = sock;
Al Viro28407632012-08-17 23:54:15 -0400422 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800423}
Al Viro56b31d12012-08-18 00:25:51 -0400424EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800425
Al Viro56b31d12012-08-18 00:25:51 -0400426static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800427{
428 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400429 int fd = get_unused_fd_flags(flags);
Al Viroce4bb042018-01-10 18:47:05 -0500430 if (unlikely(fd < 0)) {
431 sock_release(sock);
Al Viro28407632012-08-17 23:54:15 -0400432 return fd;
Al Viroce4bb042018-01-10 18:47:05 -0500433 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800434
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700435 newfile = sock_alloc_file(sock, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -0400436 if (likely(!IS_ERR(newfile))) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800437 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400438 return fd;
439 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400440
Al Viro28407632012-08-17 23:54:15 -0400441 put_unused_fd(fd);
442 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443}
444
John Fastabend406a3c62012-07-20 10:39:25 +0000445struct socket *sock_from_file(struct file *file, int *err)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800446{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800447 if (file->f_op == &socket_file_ops)
448 return file->private_data; /* set in sock_map_fd */
449
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800450 *err = -ENOTSOCK;
451 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800452}
John Fastabend406a3c62012-07-20 10:39:25 +0000453EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800454
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700456 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 * @fd: file handle
458 * @err: pointer to an error code return
459 *
460 * The file handle passed in is locked and the socket it is bound
Rosen, Rami241c4662017-05-21 22:12:38 +0300461 * to is returned. If an error occurs the err pointer is overwritten
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 * with a negative errno code and NULL is returned. The function checks
463 * for both invalid handles and passing a handle which is not a socket.
464 *
465 * On a success the socket object pointer is returned.
466 */
467
468struct socket *sockfd_lookup(int fd, int *err)
469{
470 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 struct socket *sock;
472
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700473 file = fget(fd);
474 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 *err = -EBADF;
476 return NULL;
477 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700478
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800479 sock = sock_from_file(file, err);
480 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 return sock;
483}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700484EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800486static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
487{
Al Viro00e188e2014-03-03 23:48:18 -0500488 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800489 struct socket *sock;
490
Hua Zhong36725582006-04-19 15:25:02 -0700491 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500492 if (f.file) {
493 sock = sock_from_file(f.file, err);
494 if (likely(sock)) {
495 *fput_needed = f.flags;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800496 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500497 }
498 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800499 }
500 return NULL;
501}
502
Masatake YAMATO600e1772012-08-29 10:44:29 +0000503static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
504 size_t size)
505{
506 ssize_t len;
507 ssize_t used = 0;
508
David Howellsc5ef6032015-03-17 22:26:16 +0000509 len = security_inode_listsecurity(d_inode(dentry), buffer, size);
Masatake YAMATO600e1772012-08-29 10:44:29 +0000510 if (len < 0)
511 return len;
512 used += len;
513 if (buffer) {
514 if (size < used)
515 return -ERANGE;
516 buffer += len;
517 }
518
519 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
520 used += len;
521 if (buffer) {
522 if (size < used)
523 return -ERANGE;
524 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
525 buffer += len;
526 }
527
528 return used;
529}
530
Tobias Klauserdc647ec2017-01-10 09:30:51 +0100531static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr)
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900532{
533 int err = simple_setattr(dentry, iattr);
534
Eric Biggerse1a3a602016-12-30 17:42:32 -0600535 if (!err && (iattr->ia_valid & ATTR_UID)) {
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900536 struct socket *sock = SOCKET_I(d_inode(dentry));
537
Cong Wang6d8c50d2018-06-07 13:39:49 -0700538 if (sock->sk)
539 sock->sk->sk_uid = iattr->ia_uid;
540 else
541 err = -ENOENT;
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900542 }
543
544 return err;
545}
546
Masatake YAMATO600e1772012-08-29 10:44:29 +0000547static const struct inode_operations sockfs_inode_ops = {
Masatake YAMATO600e1772012-08-29 10:44:29 +0000548 .listxattr = sockfs_listxattr,
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900549 .setattr = sockfs_setattr,
Masatake YAMATO600e1772012-08-29 10:44:29 +0000550};
551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552/**
553 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700554 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 * Allocate a new inode and socket object. The two are bound together
556 * and initialised. The socket is then returned. If we are out of inodes
557 * NULL is returned.
558 */
559
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800560struct socket *sock_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700562 struct inode *inode;
563 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200565 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 if (!inode)
567 return NULL;
568
569 sock = SOCKET_I(inode);
570
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400571 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700572 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100573 inode->i_uid = current_fsuid();
574 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000575 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 return sock;
578}
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800579EXPORT_SYMBOL(sock_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581/**
582 * sock_release - close a socket
583 * @sock: socket to close
584 *
585 * The socket is released from the protocol stack if it has a release
586 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700587 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700589
Cong Wang6d8c50d2018-06-07 13:39:49 -0700590static void __sock_release(struct socket *sock, struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
592 if (sock->ops) {
593 struct module *owner = sock->ops->owner;
594
Cong Wang6d8c50d2018-06-07 13:39:49 -0700595 if (inode)
596 inode_lock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 sock->ops->release(sock);
Cong Wang6d8c50d2018-06-07 13:39:49 -0700598 if (inode)
599 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 sock->ops = NULL;
601 module_put(owner);
602 }
603
Christoph Hellwige6476c22018-07-30 09:45:07 +0200604 if (sock->wq->fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800605 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 if (!sock->file) {
608 iput(SOCK_INODE(sock));
609 return;
610 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700611 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612}
Cong Wang6d8c50d2018-06-07 13:39:49 -0700613
614void sock_release(struct socket *sock)
615{
616 __sock_release(sock, NULL);
617}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700618EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400620void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000621{
Eric Dumazet140c55d2014-08-06 11:49:29 +0200622 u8 flags = *tx_flags;
623
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400624 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200625 flags |= SKBTX_HW_TSTAMP;
626
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400627 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200628 flags |= SKBTX_SW_TSTAMP;
629
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400630 if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200631 flags |= SKBTX_SCHED_TSTAMP;
632
Eric Dumazet140c55d2014-08-06 11:49:29 +0200633 *tx_flags = flags;
Patrick Ohly20d49472009-02-12 05:03:38 +0000634}
Willem de Bruijn67cc0d42014-09-08 19:58:58 -0400635EXPORT_SYMBOL(__sock_tx_timestamp);
Patrick Ohly20d49472009-02-12 05:03:38 +0000636
Al Virod8725c82014-12-11 00:02:50 -0500637static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638{
Al Viro01e97e62014-12-15 21:39:31 -0500639 int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg));
Al Virod8725c82014-12-11 00:02:50 -0500640 BUG_ON(ret == -EIOCBQUEUED);
641 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642}
Gu Zheng0cf00c62014-12-05 15:14:23 +0800643
Al Virod8725c82014-12-11 00:02:50 -0500644int sock_sendmsg(struct socket *sock, struct msghdr *msg)
Gu Zheng0cf00c62014-12-05 15:14:23 +0800645{
Al Virod8725c82014-12-11 00:02:50 -0500646 int err = security_socket_sendmsg(sock, msg,
Al Viro01e97e62014-12-15 21:39:31 -0500647 msg_data_left(msg));
Ying Xue1b784142015-03-02 15:37:48 +0800648
Al Virod8725c82014-12-11 00:02:50 -0500649 return err ?: sock_sendmsg_nosec(sock, msg);
Gu Zheng0cf00c62014-12-05 15:14:23 +0800650}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700651EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
653int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
654 struct kvec *vec, size_t num, size_t size)
655{
Al Viro6aa24812015-03-21 19:56:16 -0400656 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size);
Al Virod8725c82014-12-11 00:02:50 -0500657 return sock_sendmsg(sock, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700659EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
Tom Herbert306b13e2017-07-28 16:22:41 -0700661int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
662 struct kvec *vec, size_t num, size_t size)
663{
664 struct socket *sock = sk->sk_socket;
665
666 if (!sock->ops->sendmsg_locked)
John Fastabenddb5980d2017-08-15 22:31:34 -0700667 return sock_no_sendmsg_locked(sk, msg, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700668
669 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size);
670
671 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
672}
673EXPORT_SYMBOL(kernel_sendmsg_locked);
674
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400675static bool skb_is_err_queue(const struct sk_buff *skb)
676{
677 /* pkt_type of skbs enqueued on the error queue are set to
678 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
679 * in recvmsg, since skbs received on a local socket will never
680 * have a pkt_type of PACKET_OUTGOING.
681 */
682 return skb->pkt_type == PACKET_OUTGOING;
683}
684
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200685/* On transmit, software and hardware timestamps are returned independently.
686 * As the two skb clones share the hardware timestamp, which may be updated
687 * before the software timestamp is received, a hardware TX timestamp may be
688 * returned only if there is no software TX timestamp. Ignore false software
689 * timestamps, which may be made in the __sock_recv_timestamp() call when the
690 * option SO_TIMESTAMP(NS) is enabled on the socket, even when the skb has a
691 * hardware timestamp.
692 */
693static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
694{
695 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb);
696}
697
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200698static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb)
699{
700 struct scm_ts_pktinfo ts_pktinfo;
701 struct net_device *orig_dev;
702
703 if (!skb_mac_header_was_set(skb))
704 return;
705
706 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo));
707
708 rcu_read_lock();
709 orig_dev = dev_get_by_napi_id(skb_napi_id(skb));
710 if (orig_dev)
711 ts_pktinfo.if_index = orig_dev->ifindex;
712 rcu_read_unlock();
713
714 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb);
715 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
716 sizeof(ts_pktinfo), &ts_pktinfo);
717}
718
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700719/*
720 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
721 */
722void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
723 struct sk_buff *skb)
724{
Patrick Ohly20d49472009-02-12 05:03:38 +0000725 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400726 struct scm_timestamping tss;
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200727 int empty = 1, false_tstamp = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000728 struct skb_shared_hwtstamps *shhwtstamps =
729 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700730
Patrick Ohly20d49472009-02-12 05:03:38 +0000731 /* Race occurred between timestamp enabling and packet
732 receiving. Fill in the current time for now. */
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200733 if (need_software_tstamp && skb->tstamp == 0) {
Patrick Ohly20d49472009-02-12 05:03:38 +0000734 __net_timestamp(skb);
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200735 false_tstamp = 1;
736 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000737
738 if (need_software_tstamp) {
739 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
740 struct timeval tv;
741 skb_get_timestamp(skb, &tv);
742 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
743 sizeof(tv), &tv);
744 } else {
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400745 struct timespec ts;
746 skb_get_timestampns(skb, &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000747 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400748 sizeof(ts), &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000749 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700750 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000751
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400752 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400753 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400754 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000755 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400756 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400757 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200758 !skb_is_swtx_tstamp(skb, false_tstamp) &&
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200759 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) {
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400760 empty = 0;
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200761 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&
762 !skb_is_err_queue(skb))
763 put_ts_pktinfo(msg, skb);
764 }
Francis Yan1c885802016-11-27 23:07:18 -0800765 if (!empty) {
Patrick Ohly20d49472009-02-12 05:03:38 +0000766 put_cmsg(msg, SOL_SOCKET,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400767 SCM_TIMESTAMPING, sizeof(tss), &tss);
Francis Yan1c885802016-11-27 23:07:18 -0800768
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400769 if (skb_is_err_queue(skb) && skb->len &&
Soheil Hassas Yeganeh4ef1b282017-03-18 17:03:00 -0400770 SKB_EXT_ERR(skb)->opt_stats)
Francis Yan1c885802016-11-27 23:07:18 -0800771 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
772 skb->len, skb->data);
773 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700774}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300775EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
776
Johannes Berg6e3e9392011-11-09 10:15:42 +0100777void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
778 struct sk_buff *skb)
779{
780 int ack;
781
782 if (!sock_flag(sk, SOCK_WIFI_STATUS))
783 return;
784 if (!skb->wifi_acked_valid)
785 return;
786
787 ack = skb->wifi_acked;
788
789 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
790}
791EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
792
stephen hemminger11165f12010-10-18 14:27:29 +0000793static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
794 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700795{
Eyal Birger744d5a32015-03-01 14:58:31 +0200796 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
Neil Horman3b885782009-10-12 13:26:31 -0700797 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
Eyal Birger744d5a32015-03-01 14:58:31 +0200798 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
Neil Horman3b885782009-10-12 13:26:31 -0700799}
800
Eric Dumazet767dd032010-04-28 19:14:43 +0000801void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700802 struct sk_buff *skb)
803{
804 sock_recv_timestamp(msg, sk, skb);
805 sock_recv_drops(msg, sk, skb);
806}
Eric Dumazet767dd032010-04-28 19:14:43 +0000807EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700808
Ying Xue1b784142015-03-02 15:37:48 +0800809static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
Al Viro2da62902015-03-14 21:13:46 -0400810 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811{
Al Viro2da62902015-03-14 21:13:46 -0400812 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813}
814
Al Viro2da62902015-03-14 21:13:46 -0400815int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700816{
Al Viro2da62902015-03-14 21:13:46 -0400817 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700818
Al Viro2da62902015-03-14 21:13:46 -0400819 return err ?: sock_recvmsg_nosec(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700821EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822
Martin Lucinac1249c02010-12-10 00:04:05 +0000823/**
824 * kernel_recvmsg - Receive a message from a socket (kernel space)
825 * @sock: The socket to receive the message from
826 * @msg: Received message
827 * @vec: Input s/g array for message data
828 * @num: Size of input s/g array
829 * @size: Number of bytes to read
830 * @flags: Message flags (MSG_DONTWAIT, etc...)
831 *
832 * On return the msg structure contains the scatter/gather array passed in the
833 * vec argument. The array is modified so that it consists of the unfilled
834 * portion of the original array.
835 *
836 * The returned value is the total number of bytes received, or an error.
837 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700838int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
839 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840{
841 mm_segment_t oldfs = get_fs();
842 int result;
843
Al Viro6aa24812015-03-21 19:56:16 -0400844 iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 set_fs(KERNEL_DS);
Al Viro2da62902015-03-14 21:13:46 -0400846 result = sock_recvmsg(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 set_fs(oldfs);
848 return result;
849}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700850EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300852static ssize_t sock_sendpage(struct file *file, struct page *page,
853 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854{
855 struct socket *sock;
856 int flags;
857
Eric Dumazetb69aee02005-09-06 14:42:45 -0700858 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859
Eric Dumazet35f9c092012-04-05 03:05:35 +0000860 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
861 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
862 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
Linus Torvaldse6949582009-08-13 08:28:36 -0700864 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865}
866
Jens Axboe9c55e012007-11-06 23:30:13 -0800867static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700868 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800869 unsigned int flags)
870{
871 struct socket *sock = file->private_data;
872
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800873 if (unlikely(!sock->ops->splice_read))
874 return -EINVAL;
875
Jens Axboe9c55e012007-11-06 23:30:13 -0800876 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
877}
878
Al Viro8ae5e0302014-11-28 19:40:50 -0500879static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800880{
Al Viro6d652332015-01-30 16:12:56 -0500881 struct file *file = iocb->ki_filp;
882 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700883 struct msghdr msg = {.msg_iter = *to,
884 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -0500885 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800886
Al Viro8ae5e0302014-11-28 19:40:50 -0500887 if (file->f_flags & O_NONBLOCK)
888 msg.msg_flags = MSG_DONTWAIT;
889
890 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800891 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700892
Christoph Hellwig66ee59a2015-02-11 19:56:46 +0100893 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800894 return 0;
895
Al Viro2da62902015-03-14 21:13:46 -0400896 res = sock_recvmsg(sock, &msg, msg.msg_flags);
Al Viro8ae5e0302014-11-28 19:40:50 -0500897 *to = msg.msg_iter;
898 return res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800899}
900
Al Viro8ae5e0302014-11-28 19:40:50 -0500901static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902{
Al Viro6d652332015-01-30 16:12:56 -0500903 struct file *file = iocb->ki_filp;
904 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700905 struct msghdr msg = {.msg_iter = *from,
906 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -0500907 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800908
Al Viro8ae5e0302014-11-28 19:40:50 -0500909 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800910 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700911
Al Viro8ae5e0302014-11-28 19:40:50 -0500912 if (file->f_flags & O_NONBLOCK)
913 msg.msg_flags = MSG_DONTWAIT;
914
Al Viro6d652332015-01-30 16:12:56 -0500915 if (sock->type == SOCK_SEQPACKET)
916 msg.msg_flags |= MSG_EOR;
917
Al Virod8725c82014-12-11 00:02:50 -0500918 res = sock_sendmsg(sock, &msg);
Al Viro8ae5e0302014-11-28 19:40:50 -0500919 *from = msg.msg_iter;
920 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921}
922
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923/*
924 * Atomic setting of ioctl hooks to avoid race
925 * with module unload.
926 */
927
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800928static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700929static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
Eric W. Biederman881d9662007-09-17 11:56:21 -0700931void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800933 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800935 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936}
937EXPORT_SYMBOL(brioctl_set);
938
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800939static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700940static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
Eric W. Biederman881d9662007-09-17 11:56:21 -0700942void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800944 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800946 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947}
948EXPORT_SYMBOL(vlan_ioctl_set);
949
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800950static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700951static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700953void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800955 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800957 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958}
959EXPORT_SYMBOL(dlci_ioctl_set);
960
Arnd Bergmann6b960182009-11-06 23:10:54 -0800961static long sock_do_ioctl(struct net *net, struct socket *sock,
962 unsigned int cmd, unsigned long arg)
963{
964 int err;
965 void __user *argp = (void __user *)arg;
966
967 err = sock->ops->ioctl(sock, cmd, arg);
968
969 /*
970 * If this ioctl is unknown try to hand it down
971 * to the NIC driver.
972 */
Al Viro36fd6332017-06-26 13:19:16 -0400973 if (err != -ENOIOCTLCMD)
974 return err;
Arnd Bergmann6b960182009-11-06 23:10:54 -0800975
Al Viro36fd6332017-06-26 13:19:16 -0400976 if (cmd == SIOCGIFCONF) {
977 struct ifconf ifc;
978 if (copy_from_user(&ifc, argp, sizeof(struct ifconf)))
979 return -EFAULT;
980 rtnl_lock();
981 err = dev_ifconf(net, &ifc, sizeof(struct ifreq));
982 rtnl_unlock();
983 if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf)))
984 err = -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -0400985 } else {
986 struct ifreq ifr;
987 bool need_copyout;
988 if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
989 return -EFAULT;
990 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
991 if (!err && need_copyout)
992 if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
993 return -EFAULT;
Al Viro36fd6332017-06-26 13:19:16 -0400994 }
Arnd Bergmann6b960182009-11-06 23:10:54 -0800995 return err;
996}
997
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998/*
999 * With an ioctl, arg may well be a user mode pointer, but we don't know
1000 * what to do with it - that's up to the protocol still.
1001 */
1002
Kirill Tkhaid8d211a2018-02-14 16:39:56 +03001003struct ns_common *get_net_ns(struct ns_common *ns)
Andrey Vaginc62cce22016-10-24 18:29:13 -07001004{
1005 return &get_net(container_of(ns, struct net, ns))->ns;
1006}
Kirill Tkhaid8d211a2018-02-14 16:39:56 +03001007EXPORT_SYMBOL_GPL(get_net_ns);
Andrey Vaginc62cce22016-10-24 18:29:13 -07001008
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1010{
1011 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001012 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 void __user *argp = (void __user *)arg;
1014 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001015 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016
Eric Dumazetb69aee02005-09-06 14:42:45 -07001017 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001018 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001019 net = sock_net(sk);
Al Viro44c02a22017-10-05 12:59:44 -04001020 if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
1021 struct ifreq ifr;
1022 bool need_copyout;
1023 if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
1024 return -EFAULT;
1025 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
1026 if (!err && need_copyout)
1027 if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
1028 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001030#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Al Virob1b0c242017-10-01 20:13:08 -04001032 err = wext_handle_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001034#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001035 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 case FIOSETOWN:
1037 case SIOCSPGRP:
1038 err = -EFAULT;
1039 if (get_user(pid, (int __user *)argp))
1040 break;
Jiri Slaby393cc3f2017-06-13 13:35:50 +02001041 err = f_setown(sock->file, pid, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 break;
1043 case FIOGETOWN:
1044 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001045 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001046 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 break;
1048 case SIOCGIFBR:
1049 case SIOCSIFBR:
1050 case SIOCBRADDBR:
1051 case SIOCBRDELBR:
1052 err = -ENOPKG;
1053 if (!br_ioctl_hook)
1054 request_module("bridge");
1055
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001056 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001057 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001058 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001059 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 break;
1061 case SIOCGIFVLAN:
1062 case SIOCSIFVLAN:
1063 err = -ENOPKG;
1064 if (!vlan_ioctl_hook)
1065 request_module("8021q");
1066
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001067 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001069 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001070 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 case SIOCADDDLCI:
1073 case SIOCDELDLCI:
1074 err = -ENOPKG;
1075 if (!dlci_ioctl_hook)
1076 request_module("dlci");
1077
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001078 mutex_lock(&dlci_ioctl_mutex);
1079 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001081 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 break;
Andrey Vaginc62cce22016-10-24 18:29:13 -07001083 case SIOCGSKNS:
1084 err = -EPERM;
1085 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1086 break;
1087
1088 err = open_related_ns(&net->ns, get_net_ns);
1089 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 default:
Arnd Bergmann6b960182009-11-06 23:10:54 -08001091 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001093 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 return err;
1095}
1096
1097int sock_create_lite(int family, int type, int protocol, struct socket **res)
1098{
1099 int err;
1100 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001101
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 err = security_socket_create(family, type, protocol, 1);
1103 if (err)
1104 goto out;
1105
1106 sock = sock_alloc();
1107 if (!sock) {
1108 err = -ENOMEM;
1109 goto out;
1110 }
1111
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001113 err = security_socket_post_create(sock, family, type, protocol, 1);
1114 if (err)
1115 goto out_release;
1116
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117out:
1118 *res = sock;
1119 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001120out_release:
1121 sock_release(sock);
1122 sock = NULL;
1123 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001125EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
1127/* No kernel lock held - perfect */
Al Viroade994f2017-07-03 00:01:49 -04001128static __poll_t sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129{
Christoph Hellwig3cafb372018-01-09 16:07:34 +01001130 struct socket *sock = file->private_data;
Christoph Hellwiga331de32018-07-30 09:42:13 +02001131 __poll_t events = poll_requested_events(wait), flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132
Christoph Hellwige88958e2018-06-29 15:37:24 +02001133 if (!sock->ops->poll)
1134 return 0;
Christoph Hellwigf641f13b2018-07-30 09:42:12 +02001135
Christoph Hellwiga331de32018-07-30 09:42:13 +02001136 if (sk_can_busy_loop(sock->sk)) {
1137 /* poll once if requested by the syscall */
1138 if (events & POLL_BUSY_LOOP)
1139 sk_busy_loop(sock->sk, 1);
1140
1141 /* if this socket can poll_ll, tell the system call */
1142 flag = POLL_BUSY_LOOP;
1143 }
1144
1145 return sock->ops->poll(file, sock, wait) | flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146}
1147
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001148static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001150 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
1152 return sock->ops->mmap(file, sock, vma);
1153}
1154
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001155static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156{
Cong Wang6d8c50d2018-06-07 13:39:49 -07001157 __sock_release(SOCKET_I(inode), inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 return 0;
1159}
1160
1161/*
1162 * Update the socket async list
1163 *
1164 * Fasync_list locking strategy.
1165 *
1166 * 1. fasync_list is modified only under process context socket lock
1167 * i.e. under semaphore.
1168 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001169 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 */
1171
1172static int sock_fasync(int fd, struct file *filp, int on)
1173{
Eric Dumazet989a2972010-04-14 09:55:35 +00001174 struct socket *sock = filp->private_data;
1175 struct sock *sk = sock->sk;
Eric Dumazeteaefd112011-02-18 03:26:36 +00001176 struct socket_wq *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177
Eric Dumazet989a2972010-04-14 09:55:35 +00001178 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180
1181 lock_sock(sk);
Christoph Hellwige6476c22018-07-30 09:45:07 +02001182 wq = sock->wq;
Eric Dumazeteaefd112011-02-18 03:26:36 +00001183 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184
Eric Dumazeteaefd112011-02-18 03:26:36 +00001185 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001186 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001187 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001188 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189
Eric Dumazet989a2972010-04-14 09:55:35 +00001190 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 return 0;
1192}
1193
Eric Dumazetceb5d582015-11-29 20:03:11 -08001194/* This function may be called only under rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
Eric Dumazetceb5d582015-11-29 20:03:11 -08001196int sock_wake_async(struct socket_wq *wq, int how, int band)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197{
Eric Dumazetceb5d582015-11-29 20:03:11 -08001198 if (!wq || !wq->fasync_list)
1199 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001200
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001201 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001202 case SOCK_WAKE_WAITD:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001203 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 break;
1205 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001206 case SOCK_WAKE_SPACE:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001207 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 break;
1209 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001210 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001211call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001212 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001214 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001215 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08001217
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 return 0;
1219}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001220EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221
Pavel Emelyanov721db932010-09-29 16:06:32 +04001222int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001223 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224{
1225 int err;
1226 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001227 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228
1229 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001230 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 */
1232 if (family < 0 || family >= NPROTO)
1233 return -EAFNOSUPPORT;
1234 if (type < 0 || type >= SOCK_MAX)
1235 return -EINVAL;
1236
1237 /* Compatibility.
1238
1239 This uglymoron is moved from INET layer to here to avoid
1240 deadlock in module load.
1241 */
1242 if (family == PF_INET && type == SOCK_PACKET) {
liping.zhangf3c98692016-03-11 23:08:36 +08001243 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1244 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 family = PF_PACKET;
1246 }
1247
1248 err = security_socket_create(family, type, protocol, kern);
1249 if (err)
1250 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001251
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001252 /*
1253 * Allocate the socket and allow the family to set things up. if
1254 * the protocol is 0, the family is instructed to select an appropriate
1255 * default.
1256 */
1257 sock = sock_alloc();
1258 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001259 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001260 return -ENFILE; /* Not exactly a match, but its the
1261 closest posix thing */
1262 }
1263
1264 sock->type = type;
1265
Johannes Berg95a5afc2008-10-16 15:24:51 -07001266#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001267 /* Attempt to load a protocol module if the find failed.
1268 *
1269 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 * requested real, full-featured networking support upon configuration.
1271 * Otherwise module support will break!
1272 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001273 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001274 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275#endif
1276
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001277 rcu_read_lock();
1278 pf = rcu_dereference(net_families[family]);
1279 err = -EAFNOSUPPORT;
1280 if (!pf)
1281 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282
1283 /*
1284 * We will call the ->create function, that possibly is in a loadable
1285 * module, so we have to bump that loadable module refcnt first.
1286 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001287 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 goto out_release;
1289
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001290 /* Now protected by module ref count */
1291 rcu_read_unlock();
1292
Eric Paris3f378b62009-11-05 22:18:14 -08001293 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001294 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001296
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 /*
1298 * Now to bump the refcnt of the [loadable] module that owns this
1299 * socket at sock_release time we decrement its refcnt.
1300 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001301 if (!try_module_get(sock->ops->owner))
1302 goto out_module_busy;
1303
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 /*
1305 * Now that we're done with the ->create function, the [loadable]
1306 * module can have its refcnt decremented
1307 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001308 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001309 err = security_socket_post_create(sock, family, type, protocol, kern);
1310 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001311 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001312 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001314 return 0;
1315
1316out_module_busy:
1317 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001319 sock->ops = NULL;
1320 module_put(pf->owner);
1321out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001323 return err;
1324
1325out_release:
1326 rcu_read_unlock();
1327 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001329EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330
1331int sock_create(int family, int type, int protocol, struct socket **res)
1332{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001333 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001335EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001337int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338{
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001339 return __sock_create(net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001341EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001343int __sys_socket(int family, int type, int protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344{
1345 int retval;
1346 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001347 int flags;
1348
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001349 /* Check the SOCK_* constants for consistency. */
1350 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1351 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1352 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1353 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1354
Ulrich Dreppera677a032008-07-23 21:29:17 -07001355 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001356 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001357 return -EINVAL;
1358 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001360 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1361 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1362
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 retval = sock_create(family, type, protocol, &sock);
1364 if (retval < 0)
Al Viro8e1611e2017-12-05 23:29:09 +00001365 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366
Al Viro8e1611e2017-12-05 23:29:09 +00001367 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368}
1369
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001370SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1371{
1372 return __sys_socket(family, type, protocol);
1373}
1374
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375/*
1376 * Create a pair of connected sockets.
1377 */
1378
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001379int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380{
1381 struct socket *sock1, *sock2;
1382 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001383 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001384 int flags;
1385
1386 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001387 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001388 return -EINVAL;
1389 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001391 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1392 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1393
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 /*
Al Viro016a2662017-12-05 23:28:38 +00001395 * reserve descriptors and make sure we won't fail
1396 * to return them to userland.
1397 */
1398 fd1 = get_unused_fd_flags(flags);
1399 if (unlikely(fd1 < 0))
1400 return fd1;
1401
1402 fd2 = get_unused_fd_flags(flags);
1403 if (unlikely(fd2 < 0)) {
1404 put_unused_fd(fd1);
1405 return fd2;
1406 }
1407
1408 err = put_user(fd1, &usockvec[0]);
1409 if (err)
1410 goto out;
1411
1412 err = put_user(fd2, &usockvec[1]);
1413 if (err)
1414 goto out;
1415
1416 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 * Obtain the first socket and check if the underlying protocol
1418 * supports the socketpair call.
1419 */
1420
1421 err = sock_create(family, type, protocol, &sock1);
Al Viro016a2662017-12-05 23:28:38 +00001422 if (unlikely(err < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 goto out;
1424
1425 err = sock_create(family, type, protocol, &sock2);
Al Viro016a2662017-12-05 23:28:38 +00001426 if (unlikely(err < 0)) {
1427 sock_release(sock1);
1428 goto out;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001429 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001430
David Herrmannd47cd942018-05-04 16:28:20 +02001431 err = security_socket_socketpair(sock1, sock2);
1432 if (unlikely(err)) {
1433 sock_release(sock2);
1434 sock_release(sock1);
1435 goto out;
1436 }
1437
Al Viro016a2662017-12-05 23:28:38 +00001438 err = sock1->ops->socketpair(sock1, sock2);
1439 if (unlikely(err < 0)) {
1440 sock_release(sock2);
1441 sock_release(sock1);
1442 goto out;
Al Viro28407632012-08-17 23:54:15 -04001443 }
1444
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001445 newfile1 = sock_alloc_file(sock1, flags, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301446 if (IS_ERR(newfile1)) {
Al Viro28407632012-08-17 23:54:15 -04001447 err = PTR_ERR(newfile1);
Al Viro016a2662017-12-05 23:28:38 +00001448 sock_release(sock2);
1449 goto out;
Al Viro28407632012-08-17 23:54:15 -04001450 }
1451
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001452 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001453 if (IS_ERR(newfile2)) {
1454 err = PTR_ERR(newfile2);
Al Viro016a2662017-12-05 23:28:38 +00001455 fput(newfile1);
1456 goto out;
Al Virodb349502007-02-07 01:48:00 -05001457 }
1458
Al Viro157cf642008-12-14 04:57:47 -05001459 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001460
Al Virodb349502007-02-07 01:48:00 -05001461 fd_install(fd1, newfile1);
1462 fd_install(fd2, newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001463 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465out:
Al Viro016a2662017-12-05 23:28:38 +00001466 put_unused_fd(fd2);
1467 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 return err;
1469}
1470
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001471SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1472 int __user *, usockvec)
1473{
1474 return __sys_socketpair(family, type, protocol, usockvec);
1475}
1476
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477/*
1478 * Bind a name to a socket. Nothing much to do here since it's
1479 * the protocol's responsibility to handle the local address.
1480 *
1481 * We move the socket address to kernel space before we call
1482 * the protocol layer (having also checked the address is ok).
1483 */
1484
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001485int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486{
1487 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001488 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001489 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001491 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001492 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001493 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001494 if (err >= 0) {
1495 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001496 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001497 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001498 if (!err)
1499 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001500 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001501 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001503 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001504 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505 return err;
1506}
1507
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001508SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1509{
1510 return __sys_bind(fd, umyaddr, addrlen);
1511}
1512
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513/*
1514 * Perform a listen. Basically, we allow the protocol to do anything
1515 * necessary for a listen, and if that works, we mark the socket as
1516 * ready for listening.
1517 */
1518
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001519int __sys_listen(int fd, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520{
1521 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001522 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001523 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001524
1525 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1526 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001527 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001528 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001529 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530
1531 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001532 if (!err)
1533 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001535 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 }
1537 return err;
1538}
1539
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001540SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1541{
1542 return __sys_listen(fd, backlog);
1543}
1544
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545/*
1546 * For accept, we attempt to create a new socket, set up the link
1547 * with the client, wake up the client, then return the new
1548 * connected fd. We collect the address of the connector in kernel
1549 * space and move it to user at the very end. This is unclean because
1550 * we open the socket then return an error.
1551 *
1552 * 1003.1g adds the ability to recvmsg() to query connection pending
1553 * status to recvmsg. We need to add that support in a way thats
Geert Uytterhoevenb9030362018-03-02 14:43:23 +01001554 * clean when we restructure accept also.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 */
1556
Dominik Brodowski4541e802018-03-13 19:24:23 +01001557int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
1558 int __user *upeer_addrlen, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559{
1560 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001561 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001562 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001563 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564
Ulrich Drepper77d27202008-07-23 21:29:35 -07001565 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001566 return -EINVAL;
1567
1568 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1569 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1570
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001571 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572 if (!sock)
1573 goto out;
1574
1575 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001576 newsock = sock_alloc();
1577 if (!newsock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 goto out_put;
1579
1580 newsock->type = sock->type;
1581 newsock->ops = sock->ops;
1582
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583 /*
1584 * We don't need try_module_get here, as the listening socket (sock)
1585 * has the protocol module (sock->ops->owner) held.
1586 */
1587 __module_get(newsock->ops->owner);
1588
Al Viro28407632012-08-17 23:54:15 -04001589 newfd = get_unused_fd_flags(flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001590 if (unlikely(newfd < 0)) {
1591 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001592 sock_release(newsock);
1593 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001594 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001595 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301596 if (IS_ERR(newfile)) {
Al Viro28407632012-08-17 23:54:15 -04001597 err = PTR_ERR(newfile);
1598 put_unused_fd(newfd);
Al Viro28407632012-08-17 23:54:15 -04001599 goto out_put;
1600 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001601
Frank Filza79af592005-09-27 15:23:38 -07001602 err = security_socket_accept(sock, newsock);
1603 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001604 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001605
David Howellscdfbabf2017-03-09 08:09:05 +00001606 err = sock->ops->accept(sock, newsock, sock->file->f_flags, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001608 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609
1610 if (upeer_sockaddr) {
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001611 len = newsock->ops->getname(newsock,
1612 (struct sockaddr *)&address, 2);
1613 if (len < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001615 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001617 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001618 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001620 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 }
1622
1623 /* File flags are not inherited via accept() unlike another OSes. */
1624
David S. Miller39d8c1b2006-03-20 17:13:49 -08001625 fd_install(newfd, newfile);
1626 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001629 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630out:
1631 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001632out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001633 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001634 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635 goto out_put;
1636}
1637
Dominik Brodowski4541e802018-03-13 19:24:23 +01001638SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1639 int __user *, upeer_addrlen, int, flags)
1640{
1641 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
1642}
1643
Heiko Carstens20f37032009-01-14 14:14:23 +01001644SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1645 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001646{
Dominik Brodowski4541e802018-03-13 19:24:23 +01001647 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001648}
1649
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650/*
1651 * Attempt to connect to a socket with the server address. The address
1652 * is in user space so we verify it is OK and move it to kernel space.
1653 *
1654 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1655 * break bindings
1656 *
1657 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1658 * other SEQPACKET protocols that take time to connect() as it doesn't
1659 * include the -EINPROGRESS status for such sockets.
1660 */
1661
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01001662int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663{
1664 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001665 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001666 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001668 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 if (!sock)
1670 goto out;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001671 err = move_addr_to_kernel(uservaddr, addrlen, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672 if (err < 0)
1673 goto out_put;
1674
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001675 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001676 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677 if (err)
1678 goto out_put;
1679
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001680 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681 sock->file->f_flags);
1682out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001683 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684out:
1685 return err;
1686}
1687
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01001688SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1689 int, addrlen)
1690{
1691 return __sys_connect(fd, uservaddr, addrlen);
1692}
1693
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694/*
1695 * Get the local address ('name') of a socket object. Move the obtained
1696 * name to user space.
1697 */
1698
Dominik Brodowski8882a102018-03-13 19:43:14 +01001699int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1700 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701{
1702 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001703 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001704 int err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001705
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001706 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707 if (!sock)
1708 goto out;
1709
1710 err = security_socket_getsockname(sock);
1711 if (err)
1712 goto out_put;
1713
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001714 err = sock->ops->getname(sock, (struct sockaddr *)&address, 0);
1715 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716 goto out_put;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001717 /* "err" is actually length in this case */
1718 err = move_addr_to_user(&address, err, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719
1720out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001721 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722out:
1723 return err;
1724}
1725
Dominik Brodowski8882a102018-03-13 19:43:14 +01001726SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1727 int __user *, usockaddr_len)
1728{
1729 return __sys_getsockname(fd, usockaddr, usockaddr_len);
1730}
1731
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732/*
1733 * Get the remote address ('name') of a socket object. Move the obtained
1734 * name to user space.
1735 */
1736
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001737int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1738 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739{
1740 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001741 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001742 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001744 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1745 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746 err = security_socket_getpeername(sock);
1747 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001748 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 return err;
1750 }
1751
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001752 err = sock->ops->getname(sock, (struct sockaddr *)&address, 1);
1753 if (err >= 0)
1754 /* "err" is actually length in this case */
1755 err = move_addr_to_user(&address, err, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001756 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001757 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758 }
1759 return err;
1760}
1761
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001762SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1763 int __user *, usockaddr_len)
1764{
1765 return __sys_getpeername(fd, usockaddr, usockaddr_len);
1766}
1767
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768/*
1769 * Send a datagram to a given address. We move the address into kernel
1770 * space and check the user space data area is readable before invoking
1771 * the protocol.
1772 */
Dominik Brodowski211b6342018-03-13 19:18:52 +01001773int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
1774 struct sockaddr __user *addr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775{
1776 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001777 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778 int err;
1779 struct msghdr msg;
1780 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001781 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001782
Al Viro602bd0e2015-03-21 19:12:32 -04001783 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
1784 if (unlikely(err))
1785 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001786 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1787 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001788 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001789
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001790 msg.msg_name = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001791 msg.msg_control = NULL;
1792 msg.msg_controllen = 0;
1793 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001794 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001795 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796 if (err < 0)
1797 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001798 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001799 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 }
1801 if (sock->file->f_flags & O_NONBLOCK)
1802 flags |= MSG_DONTWAIT;
1803 msg.msg_flags = flags;
Al Virod8725c82014-12-11 00:02:50 -05001804 err = sock_sendmsg(sock, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001806out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001807 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001808out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809 return err;
1810}
1811
Dominik Brodowski211b6342018-03-13 19:18:52 +01001812SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1813 unsigned int, flags, struct sockaddr __user *, addr,
1814 int, addr_len)
1815{
1816 return __sys_sendto(fd, buff, len, flags, addr, addr_len);
1817}
1818
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001820 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821 */
1822
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001823SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001824 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825{
Dominik Brodowski211b6342018-03-13 19:18:52 +01001826 return __sys_sendto(fd, buff, len, flags, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827}
1828
1829/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001830 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831 * sender. We verify the buffers are writable and if needed move the
1832 * sender address from kernel to user space.
1833 */
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01001834int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
1835 struct sockaddr __user *addr, int __user *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836{
1837 struct socket *sock;
1838 struct iovec iov;
1839 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001840 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001841 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001842 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843
Al Viro602bd0e2015-03-21 19:12:32 -04001844 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
1845 if (unlikely(err))
1846 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001847 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001849 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001851 msg.msg_control = NULL;
1852 msg.msg_controllen = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01001853 /* Save some cycles and don't copy the address if not needed */
1854 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1855 /* We assume all kernel code knows the size of sockaddr_storage */
1856 msg.msg_namelen = 0;
tadeusz.struk@intel.com130ed5d2015-12-15 10:46:17 -08001857 msg.msg_iocb = NULL;
Alexander Potapenko9f138fa2017-03-08 18:08:16 +01001858 msg.msg_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859 if (sock->file->f_flags & O_NONBLOCK)
1860 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04001861 err = sock_recvmsg(sock, &msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001863 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001864 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001865 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001866 if (err2 < 0)
1867 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001869
1870 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001871out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 return err;
1873}
1874
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01001875SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1876 unsigned int, flags, struct sockaddr __user *, addr,
1877 int __user *, addr_len)
1878{
1879 return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len);
1880}
1881
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001883 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884 */
1885
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02001886SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1887 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888{
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01001889 return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890}
1891
1892/*
1893 * Set a socket option. Because we don't know the option lengths we have
1894 * to pass the user mode parameter for the protocols to sort out.
1895 */
1896
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01001897static int __sys_setsockopt(int fd, int level, int optname,
1898 char __user *optval, int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001900 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 struct socket *sock;
1902
1903 if (optlen < 0)
1904 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001905
1906 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1907 if (sock != NULL) {
1908 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001909 if (err)
1910 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911
1912 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001913 err =
1914 sock_setsockopt(sock, level, optname, optval,
1915 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001917 err =
1918 sock->ops->setsockopt(sock, level, optname, optval,
1919 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001920out_put:
1921 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922 }
1923 return err;
1924}
1925
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01001926SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1927 char __user *, optval, int, optlen)
1928{
1929 return __sys_setsockopt(fd, level, optname, optval, optlen);
1930}
1931
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932/*
1933 * Get a socket option. Because we don't know the option lengths we have
1934 * to pass a user mode parameter for the protocols to sort out.
1935 */
1936
Dominik Brodowski13a2d702018-03-13 20:15:04 +01001937static int __sys_getsockopt(int fd, int level, int optname,
1938 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001940 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941 struct socket *sock;
1942
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001943 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1944 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001945 err = security_socket_getsockopt(sock, level, optname);
1946 if (err)
1947 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948
1949 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001950 err =
1951 sock_getsockopt(sock, level, optname, optval,
1952 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001954 err =
1955 sock->ops->getsockopt(sock, level, optname, optval,
1956 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001957out_put:
1958 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959 }
1960 return err;
1961}
1962
Dominik Brodowski13a2d702018-03-13 20:15:04 +01001963SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1964 char __user *, optval, int __user *, optlen)
1965{
1966 return __sys_getsockopt(fd, level, optname, optval, optlen);
1967}
1968
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969/*
1970 * Shutdown a socket.
1971 */
1972
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01001973int __sys_shutdown(int fd, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001975 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976 struct socket *sock;
1977
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001978 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1979 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001981 if (!err)
1982 err = sock->ops->shutdown(sock, how);
1983 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984 }
1985 return err;
1986}
1987
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01001988SYSCALL_DEFINE2(shutdown, int, fd, int, how)
1989{
1990 return __sys_shutdown(fd, how);
1991}
1992
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001993/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994 * fields which are the same type (int / unsigned) on our platforms.
1995 */
1996#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1997#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1998#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1999
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002000struct used_address {
2001 struct sockaddr_storage name;
2002 unsigned int name_len;
2003};
2004
Al Viroda184282015-03-21 19:29:06 -04002005static int copy_msghdr_from_user(struct msghdr *kmsg,
2006 struct user_msghdr __user *umsg,
2007 struct sockaddr __user **save_addr,
2008 struct iovec **iov)
Dan Carpenter1661bf32013-10-03 00:27:20 +03002009{
Al Viroffb07552017-06-27 19:32:04 -04002010 struct user_msghdr msg;
Al Viro08adb7d2014-11-10 20:23:13 -05002011 ssize_t err;
2012
Al Viroffb07552017-06-27 19:32:04 -04002013 if (copy_from_user(&msg, umsg, sizeof(*umsg)))
Dan Carpenter1661bf32013-10-03 00:27:20 +03002014 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00002015
Paolo Abeni864d9662017-07-21 18:49:45 +02002016 kmsg->msg_control = (void __force *)msg.msg_control;
Al Viroffb07552017-06-27 19:32:04 -04002017 kmsg->msg_controllen = msg.msg_controllen;
2018 kmsg->msg_flags = msg.msg_flags;
2019
2020 kmsg->msg_namelen = msg.msg_namelen;
2021 if (!msg.msg_name)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07002022 kmsg->msg_namelen = 0;
2023
Matthew Leachdbb490b2014-03-11 11:58:27 +00002024 if (kmsg->msg_namelen < 0)
2025 return -EINVAL;
2026
Dan Carpenter1661bf32013-10-03 00:27:20 +03002027 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03002028 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05002029
2030 if (save_addr)
Al Viroffb07552017-06-27 19:32:04 -04002031 *save_addr = msg.msg_name;
Al Viro08adb7d2014-11-10 20:23:13 -05002032
Al Viroffb07552017-06-27 19:32:04 -04002033 if (msg.msg_name && kmsg->msg_namelen) {
Al Viro08adb7d2014-11-10 20:23:13 -05002034 if (!save_addr) {
Paolo Abeni864d9662017-07-21 18:49:45 +02002035 err = move_addr_to_kernel(msg.msg_name,
2036 kmsg->msg_namelen,
Al Viro08adb7d2014-11-10 20:23:13 -05002037 kmsg->msg_name);
2038 if (err < 0)
2039 return err;
2040 }
2041 } else {
2042 kmsg->msg_name = NULL;
2043 kmsg->msg_namelen = 0;
2044 }
2045
Al Viroffb07552017-06-27 19:32:04 -04002046 if (msg.msg_iovlen > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05002047 return -EMSGSIZE;
2048
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002049 kmsg->msg_iocb = NULL;
2050
Al Viroffb07552017-06-27 19:32:04 -04002051 return import_iovec(save_addr ? READ : WRITE,
2052 msg.msg_iov, msg.msg_iovlen,
Al Viroda184282015-03-21 19:29:06 -04002053 UIO_FASTIOV, iov, &kmsg->msg_iter);
Dan Carpenter1661bf32013-10-03 00:27:20 +03002054}
2055
Al Viro666547f2014-04-06 14:03:05 -04002056static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002057 struct msghdr *msg_sys, unsigned int flags,
Tom Herbert28a94d82016-03-07 14:11:02 -08002058 struct used_address *used_address,
2059 unsigned int allowed_msghdr_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002061 struct compat_msghdr __user *msg_compat =
2062 (struct compat_msghdr __user *)msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002063 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07002065 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Amit Kushwaha846cc122016-12-08 18:21:53 +05302066 __aligned(sizeof(__kernel_size_t));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002067 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068 unsigned char *ctl_buf = ctl;
Al Virod8725c82014-12-11 00:02:50 -05002069 int ctl_len;
Al Viro08adb7d2014-11-10 20:23:13 -05002070 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002071
Al Viro08adb7d2014-11-10 20:23:13 -05002072 msg_sys->msg_name = &address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073
Al Viro08449322014-11-09 22:33:45 -05002074 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002075 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
Al Viro08449322014-11-09 22:33:45 -05002076 else
Al Viro08adb7d2014-11-10 20:23:13 -05002077 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002078 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04002079 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080
2081 err = -ENOBUFS;
2082
Anton Blanchard228e5482011-05-02 20:21:35 +00002083 if (msg_sys->msg_controllen > INT_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084 goto out_freeiov;
Tom Herbert28a94d82016-03-07 14:11:02 -08002085 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
Anton Blanchard228e5482011-05-02 20:21:35 +00002086 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002088 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00002089 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002090 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002091 if (err)
2092 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00002093 ctl_buf = msg_sys->msg_control;
2094 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095 } else if (ctl_len) {
David S. Millerac4340f2017-01-04 13:24:19 -05002096 BUILD_BUG_ON(sizeof(struct cmsghdr) !=
2097 CMSG_ALIGN(sizeof(struct cmsghdr)));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002098 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002100 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101 goto out_freeiov;
2102 }
2103 err = -EFAULT;
2104 /*
Anton Blanchard228e5482011-05-02 20:21:35 +00002105 * Careful! Before this, msg_sys->msg_control contains a user pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002106 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2107 * checking falls down on this.
2108 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00002109 if (copy_from_user(ctl_buf,
Anton Blanchard228e5482011-05-02 20:21:35 +00002110 (void __user __force *)msg_sys->msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002111 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002112 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00002113 msg_sys->msg_control = ctl_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114 }
Anton Blanchard228e5482011-05-02 20:21:35 +00002115 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002116
2117 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00002118 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002119 /*
2120 * If this is sendmmsg() and current destination address is same as
2121 * previously succeeded address, omit asking LSM's decision.
2122 * used_address->name_len is initialized to UINT_MAX so that the first
2123 * destination address never matches.
2124 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002125 if (used_address && msg_sys->msg_name &&
2126 used_address->name_len == msg_sys->msg_namelen &&
2127 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002128 used_address->name_len)) {
Al Virod8725c82014-12-11 00:02:50 -05002129 err = sock_sendmsg_nosec(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002130 goto out_freectl;
2131 }
Al Virod8725c82014-12-11 00:02:50 -05002132 err = sock_sendmsg(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002133 /*
2134 * If this is sendmmsg() and sending to current destination address was
2135 * successful, remember it.
2136 */
2137 if (used_address && err >= 0) {
2138 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002139 if (msg_sys->msg_name)
2140 memcpy(&used_address->name, msg_sys->msg_name,
2141 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002142 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002143
2144out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002145 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002146 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2147out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04002148 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00002149 return err;
2150}
2151
2152/*
2153 * BSD sendmsg interface
2154 */
2155
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002156long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2157 bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002158{
2159 int fput_needed, err;
2160 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002161 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00002162
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002163 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2164 return -EINVAL;
2165
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002166 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00002167 if (!sock)
2168 goto out;
2169
Tom Herbert28a94d82016-03-07 14:11:02 -08002170 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
Anton Blanchard228e5482011-05-02 20:21:35 +00002171
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002172 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002173out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002174 return err;
2175}
2176
Al Viro666547f2014-04-06 14:03:05 -04002177SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002178{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002179 return __sys_sendmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002180}
2181
Anton Blanchard228e5482011-05-02 20:21:35 +00002182/*
2183 * Linux sendmmsg interface
2184 */
2185
2186int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002187 unsigned int flags, bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002188{
2189 int fput_needed, err, datagrams;
2190 struct socket *sock;
2191 struct mmsghdr __user *entry;
2192 struct compat_mmsghdr __user *compat_entry;
2193 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002194 struct used_address used_address;
Tom Herbertf0922762016-03-07 14:11:03 -08002195 unsigned int oflags = flags;
Anton Blanchard228e5482011-05-02 20:21:35 +00002196
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002197 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2198 return -EINVAL;
2199
Anton Blanchard98382f42011-08-04 14:07:39 +00002200 if (vlen > UIO_MAXIOV)
2201 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002202
2203 datagrams = 0;
2204
2205 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2206 if (!sock)
2207 return err;
2208
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002209 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002210 entry = mmsg;
2211 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002212 err = 0;
Tom Herbertf0922762016-03-07 14:11:03 -08002213 flags |= MSG_BATCH;
Anton Blanchard228e5482011-05-02 20:21:35 +00002214
2215 while (datagrams < vlen) {
Tom Herbertf0922762016-03-07 14:11:03 -08002216 if (datagrams == vlen - 1)
2217 flags = oflags;
2218
Anton Blanchard228e5482011-05-02 20:21:35 +00002219 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002220 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002221 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002222 if (err < 0)
2223 break;
2224 err = __put_user(err, &compat_entry->msg_len);
2225 ++compat_entry;
2226 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002227 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002228 (struct user_msghdr __user *)entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002229 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002230 if (err < 0)
2231 break;
2232 err = put_user(err, &entry->msg_len);
2233 ++entry;
2234 }
2235
2236 if (err)
2237 break;
2238 ++datagrams;
Soheil Hassas Yeganeh30238982016-11-04 15:36:49 -04002239 if (msg_data_left(&msg_sys))
2240 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002241 cond_resched();
Anton Blanchard228e5482011-05-02 20:21:35 +00002242 }
2243
Anton Blanchard228e5482011-05-02 20:21:35 +00002244 fput_light(sock->file, fput_needed);
2245
Anton Blanchard728ffb82011-08-04 14:07:38 +00002246 /* We only return an error if no datagrams were able to be sent */
2247 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002248 return datagrams;
2249
Anton Blanchard228e5482011-05-02 20:21:35 +00002250 return err;
2251}
2252
2253SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2254 unsigned int, vlen, unsigned int, flags)
2255{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002256 return __sys_sendmmsg(fd, mmsg, vlen, flags, true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002257}
2258
Al Viro666547f2014-04-06 14:03:05 -04002259static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002260 struct msghdr *msg_sys, unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002261{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002262 struct compat_msghdr __user *msg_compat =
2263 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002265 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266 unsigned long cmsg_ptr;
Al Viro2da62902015-03-14 21:13:46 -04002267 int len;
Al Viro08adb7d2014-11-10 20:23:13 -05002268 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269
2270 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002271 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002272
2273 /* user mode address pointers */
2274 struct sockaddr __user *uaddr;
Al Viro08adb7d2014-11-10 20:23:13 -05002275 int __user *uaddr_len = COMPAT_NAMELEN(msg);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002276
Al Viro08adb7d2014-11-10 20:23:13 -05002277 msg_sys->msg_name = &addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002278
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002279 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002280 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002281 else
Al Viro08adb7d2014-11-10 20:23:13 -05002282 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002283 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04002284 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002285
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002286 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2287 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002288
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002289 /* We assume all kernel code knows the size of sockaddr_storage */
2290 msg_sys->msg_namelen = 0;
2291
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292 if (sock->file->f_flags & O_NONBLOCK)
2293 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002294 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002295 if (err < 0)
2296 goto out_freeiov;
2297 len = err;
2298
2299 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002300 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002301 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002302 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303 if (err < 0)
2304 goto out_freeiov;
2305 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002306 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f4212005-09-16 16:51:01 -07002307 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002308 if (err)
2309 goto out_freeiov;
2310 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002311 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002312 &msg_compat->msg_controllen);
2313 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002314 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002315 &msg->msg_controllen);
2316 if (err)
2317 goto out_freeiov;
2318 err = len;
2319
2320out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04002321 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002322 return err;
2323}
2324
2325/*
2326 * BSD recvmsg interface
2327 */
2328
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002329long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2330 bool forbid_cmsg_compat)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002331{
2332 int fput_needed, err;
2333 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002334 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002335
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002336 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2337 return -EINVAL;
2338
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002339 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002340 if (!sock)
2341 goto out;
2342
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002343 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002344
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002345 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002346out:
2347 return err;
2348}
2349
Al Viro666547f2014-04-06 14:03:05 -04002350SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002351 unsigned int, flags)
2352{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002353 return __sys_recvmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002354}
2355
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002356/*
2357 * Linux recvmmsg interface
2358 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002359
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002360int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2361 unsigned int flags, struct timespec *timeout)
2362{
2363 int fput_needed, err, datagrams;
2364 struct socket *sock;
2365 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002366 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002367 struct msghdr msg_sys;
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002368 struct timespec64 end_time;
2369 struct timespec64 timeout64;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002370
2371 if (timeout &&
2372 poll_select_set_timeout(&end_time, timeout->tv_sec,
2373 timeout->tv_nsec))
2374 return -EINVAL;
2375
2376 datagrams = 0;
2377
2378 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2379 if (!sock)
2380 return err;
2381
Soheil Hassas Yeganeh7797dc42018-02-27 18:22:40 -05002382 if (likely(!(flags & MSG_ERRQUEUE))) {
2383 err = sock_error(sock->sk);
2384 if (err) {
2385 datagrams = err;
2386 goto out_put;
2387 }
Maxime Jayate623a9e2017-02-21 18:35:51 +01002388 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002389
2390 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002391 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002392
2393 while (datagrams < vlen) {
2394 /*
2395 * No need to ask LSM for more than the first datagram.
2396 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002397 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002398 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_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, &compat_entry->msg_len);
2404 ++compat_entry;
2405 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002406 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002407 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002408 &msg_sys, flags & ~MSG_WAITFORONE,
2409 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002410 if (err < 0)
2411 break;
2412 err = put_user(err, &entry->msg_len);
2413 ++entry;
2414 }
2415
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002416 if (err)
2417 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002418 ++datagrams;
2419
Brandon L Black71c5c1592010-03-26 16:18:03 +00002420 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2421 if (flags & MSG_WAITFORONE)
2422 flags |= MSG_DONTWAIT;
2423
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002424 if (timeout) {
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002425 ktime_get_ts64(&timeout64);
2426 *timeout = timespec64_to_timespec(
2427 timespec64_sub(end_time, timeout64));
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002428 if (timeout->tv_sec < 0) {
2429 timeout->tv_sec = timeout->tv_nsec = 0;
2430 break;
2431 }
2432
2433 /* Timeout, return less than vlen datagrams */
2434 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2435 break;
2436 }
2437
2438 /* Out of band data, return right away */
2439 if (msg_sys.msg_flags & MSG_OOB)
2440 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002441 cond_resched();
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002442 }
2443
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002444 if (err == 0)
2445 goto out_put;
2446
2447 if (datagrams == 0) {
2448 datagrams = err;
2449 goto out_put;
2450 }
2451
2452 /*
2453 * We may return less entries than requested (vlen) if the
2454 * sock is non block and there aren't enough datagrams...
2455 */
2456 if (err != -EAGAIN) {
2457 /*
2458 * ... or if recvmsg returns an error after we
2459 * received some datagrams, where we record the
2460 * error to return on the next call or if the
2461 * app asks about it using getsockopt(SO_ERROR).
2462 */
2463 sock->sk->sk_err = -err;
2464 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002465out_put:
2466 fput_light(sock->file, fput_needed);
2467
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002468 return datagrams;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002469}
2470
Dominik Brodowski1255e262018-03-13 20:44:21 +01002471static int do_sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2472 unsigned int vlen, unsigned int flags,
2473 struct timespec __user *timeout)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002474{
2475 int datagrams;
2476 struct timespec timeout_sys;
2477
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002478 if (flags & MSG_CMSG_COMPAT)
2479 return -EINVAL;
2480
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002481 if (!timeout)
2482 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2483
2484 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2485 return -EFAULT;
2486
2487 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2488
2489 if (datagrams > 0 &&
2490 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2491 datagrams = -EFAULT;
2492
2493 return datagrams;
2494}
2495
Dominik Brodowski1255e262018-03-13 20:44:21 +01002496SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2497 unsigned int, vlen, unsigned int, flags,
2498 struct timespec __user *, timeout)
2499{
2500 return do_sys_recvmmsg(fd, mmsg, vlen, flags, timeout);
2501}
2502
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002503#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002504/* Argument list sizes for sys_socketcall */
2505#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002506static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002507 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2508 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2509 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002510 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002511};
2512
Linus Torvalds1da177e2005-04-16 15:20:36 -07002513#undef AL
2514
2515/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002516 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002517 *
2518 * Argument checking cleaned up. Saved 20% in size.
2519 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002520 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002521 */
2522
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002523SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002524{
Chen Gang2950fa92013-04-07 16:55:23 +08002525 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002526 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002527 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002528 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002529
Anton Blanchard228e5482011-05-02 20:21:35 +00002530 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002531 return -EINVAL;
2532
Arjan van de Ven47379052009-09-28 12:57:44 -07002533 len = nargs[call];
2534 if (len > sizeof(a))
2535 return -EINVAL;
2536
Linus Torvalds1da177e2005-04-16 15:20:36 -07002537 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002538 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002539 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002540
Chen Gang2950fa92013-04-07 16:55:23 +08002541 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2542 if (err)
2543 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002544
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002545 a0 = a[0];
2546 a1 = a[1];
2547
2548 switch (call) {
2549 case SYS_SOCKET:
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01002550 err = __sys_socket(a0, a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002551 break;
2552 case SYS_BIND:
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01002553 err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002554 break;
2555 case SYS_CONNECT:
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01002556 err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002557 break;
2558 case SYS_LISTEN:
Dominik Brodowski25e290e2018-03-13 19:36:54 +01002559 err = __sys_listen(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002560 break;
2561 case SYS_ACCEPT:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002562 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2563 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002564 break;
2565 case SYS_GETSOCKNAME:
2566 err =
Dominik Brodowski8882a102018-03-13 19:43:14 +01002567 __sys_getsockname(a0, (struct sockaddr __user *)a1,
2568 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002569 break;
2570 case SYS_GETPEERNAME:
2571 err =
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01002572 __sys_getpeername(a0, (struct sockaddr __user *)a1,
2573 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002574 break;
2575 case SYS_SOCKETPAIR:
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01002576 err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002577 break;
2578 case SYS_SEND:
Dominik Brodowskif3bf8962018-03-13 19:52:00 +01002579 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2580 NULL, 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002581 break;
2582 case SYS_SENDTO:
Dominik Brodowski211b6342018-03-13 19:18:52 +01002583 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2584 (struct sockaddr __user *)a[4], a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002585 break;
2586 case SYS_RECV:
Dominik Brodowskid27e9af2018-03-13 19:54:17 +01002587 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2588 NULL, NULL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002589 break;
2590 case SYS_RECVFROM:
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002591 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2592 (struct sockaddr __user *)a[4],
2593 (int __user *)a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002594 break;
2595 case SYS_SHUTDOWN:
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002596 err = __sys_shutdown(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002597 break;
2598 case SYS_SETSOCKOPT:
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002599 err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3],
2600 a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002601 break;
2602 case SYS_GETSOCKOPT:
2603 err =
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002604 __sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2605 (int __user *)a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002606 break;
2607 case SYS_SENDMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002608 err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1,
2609 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002610 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002611 case SYS_SENDMMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002612 err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2],
2613 a[3], true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002614 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002615 case SYS_RECVMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002616 err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1,
2617 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002618 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002619 case SYS_RECVMMSG:
Dominik Brodowski1255e262018-03-13 20:44:21 +01002620 err = do_sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2],
2621 a[3], (struct timespec __user *)a[4]);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002622 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002623 case SYS_ACCEPT4:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002624 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2625 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002626 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002627 default:
2628 err = -EINVAL;
2629 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002630 }
2631 return err;
2632}
2633
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002634#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002635
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002636/**
2637 * sock_register - add a socket protocol handler
2638 * @ops: description of protocol
2639 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002640 * This function is called by a protocol handler that wants to
2641 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09002642 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002643 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002644 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002645int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002646{
2647 int err;
2648
2649 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08002650 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651 return -ENOBUFS;
2652 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002653
2654 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002655 if (rcu_dereference_protected(net_families[ops->family],
2656 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002657 err = -EEXIST;
2658 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00002659 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660 err = 0;
2661 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002662 spin_unlock(&net_family_lock);
2663
Yang Yingliang3410f222014-02-12 17:09:55 +08002664 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002665 return err;
2666}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002667EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002668
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002669/**
2670 * sock_unregister - remove a protocol handler
2671 * @family: protocol family to remove
2672 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002673 * This function is called by a protocol handler that wants to
2674 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002675 * new socket creation.
2676 *
2677 * If protocol handler is a module, then it can use module reference
2678 * counts to protect against new references. If protocol handler is not
2679 * a module then it needs to provide its own protection in
2680 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002681 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002682void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002684 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002685
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002686 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00002687 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002688 spin_unlock(&net_family_lock);
2689
2690 synchronize_rcu();
2691
Yang Yingliang3410f222014-02-12 17:09:55 +08002692 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002694EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002695
Xin Longbf2ae2e2018-03-10 18:57:50 +08002696bool sock_is_registered(int family)
2697{
2698 return family < NPROTO && rcu_access_pointer(net_families[family]);
2699}
2700
Andi Kleen77d76ea2005-12-22 12:43:42 -08002701static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002702{
Nick Pigginb3e19d92011-01-07 17:50:11 +11002703 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00002704 /*
2705 * Initialize the network sysctl infrastructure.
2706 */
2707 err = net_sysctl_init();
2708 if (err)
2709 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11002710
Linus Torvalds1da177e2005-04-16 15:20:36 -07002711 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002712 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002713 */
2714 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002715
2716 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002717 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002718 */
2719
2720 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11002721
2722 err = register_filesystem(&sock_fs_type);
2723 if (err)
2724 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002725 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11002726 if (IS_ERR(sock_mnt)) {
2727 err = PTR_ERR(sock_mnt);
2728 goto out_mount;
2729 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08002730
2731 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002732 */
2733
2734#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00002735 err = netfilter_init();
2736 if (err)
2737 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002738#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002739
Daniel Borkmann408eccc2014-04-01 16:20:23 +02002740 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00002741
Nick Pigginb3e19d92011-01-07 17:50:11 +11002742out:
2743 return err;
2744
2745out_mount:
2746 unregister_filesystem(&sock_fs_type);
2747out_fs:
2748 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002749}
2750
Andi Kleen77d76ea2005-12-22 12:43:42 -08002751core_initcall(sock_init); /* early initcall */
2752
Linus Torvalds1da177e2005-04-16 15:20:36 -07002753#ifdef CONFIG_PROC_FS
2754void socket_seq_show(struct seq_file *seq)
2755{
Tonghao Zhang648845a2017-12-14 05:51:58 -08002756 seq_printf(seq, "sockets: used %d\n",
2757 sock_inuse_get(seq->private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002758}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002759#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002760
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002761#ifdef CONFIG_COMPAT
Arnd Bergmann6b960182009-11-06 23:10:54 -08002762static int do_siocgstamp(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002763 unsigned int cmd, void __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002764{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002765 mm_segment_t old_fs = get_fs();
2766 struct timeval ktv;
2767 int err;
2768
2769 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002770 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002771 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002772 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002773 err = compat_put_timeval(&ktv, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002774
Arnd Bergmann7a229382009-11-06 23:00:29 -08002775 return err;
2776}
2777
Arnd Bergmann6b960182009-11-06 23:10:54 -08002778static int do_siocgstampns(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002779 unsigned int cmd, void __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002780{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002781 mm_segment_t old_fs = get_fs();
2782 struct timespec kts;
2783 int err;
2784
2785 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002786 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002787 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002788 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002789 err = compat_put_timespec(&kts, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002790
Arnd Bergmann7a229382009-11-06 23:00:29 -08002791 return err;
2792}
2793
Al Viro36fd6332017-06-26 13:19:16 -04002794static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002795{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002796 struct compat_ifconf ifc32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002797 struct ifconf ifc;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002798 int err;
2799
Arnd Bergmann6b960182009-11-06 23:10:54 -08002800 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002801 return -EFAULT;
2802
Al Viro36fd6332017-06-26 13:19:16 -04002803 ifc.ifc_len = ifc32.ifc_len;
2804 ifc.ifc_req = compat_ptr(ifc32.ifcbuf);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002805
Al Viro36fd6332017-06-26 13:19:16 -04002806 rtnl_lock();
2807 err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq));
2808 rtnl_unlock();
Arnd Bergmann7a229382009-11-06 23:00:29 -08002809 if (err)
2810 return err;
2811
Al Viro36fd6332017-06-26 13:19:16 -04002812 ifc32.ifc_len = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002813 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002814 return -EFAULT;
2815
2816 return 0;
2817}
2818
Arnd Bergmann6b960182009-11-06 23:10:54 -08002819static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002820{
Ben Hutchings3a7da392011-03-17 07:34:32 +00002821 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2822 bool convert_in = false, convert_out = false;
Al Viro44c02a22017-10-05 12:59:44 -04002823 size_t buf_size = 0;
2824 struct ethtool_rxnfc __user *rxnfc = NULL;
2825 struct ifreq ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002826 u32 rule_cnt = 0, actual_rule_cnt;
2827 u32 ethcmd;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002828 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002829 int ret;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002830
2831 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2832 return -EFAULT;
2833
Ben Hutchings3a7da392011-03-17 07:34:32 +00002834 compat_rxnfc = compat_ptr(data);
2835
2836 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002837 return -EFAULT;
2838
Ben Hutchings3a7da392011-03-17 07:34:32 +00002839 /* Most ethtool structures are defined without padding.
2840 * Unfortunately struct ethtool_rxnfc is an exception.
2841 */
2842 switch (ethcmd) {
2843 default:
2844 break;
2845 case ETHTOOL_GRXCLSRLALL:
2846 /* Buffer size is variable */
2847 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2848 return -EFAULT;
2849 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2850 return -ENOMEM;
2851 buf_size += rule_cnt * sizeof(u32);
2852 /* fall through */
2853 case ETHTOOL_GRXRINGS:
2854 case ETHTOOL_GRXCLSRLCNT:
2855 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00002856 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002857 convert_out = true;
2858 /* fall through */
2859 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002860 buf_size += sizeof(struct ethtool_rxnfc);
2861 convert_in = true;
Al Viro44c02a22017-10-05 12:59:44 -04002862 rxnfc = compat_alloc_user_space(buf_size);
Ben Hutchings3a7da392011-03-17 07:34:32 +00002863 break;
2864 }
2865
Al Viro44c02a22017-10-05 12:59:44 -04002866 if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ))
Ben Hutchings3a7da392011-03-17 07:34:32 +00002867 return -EFAULT;
2868
Al Viro44c02a22017-10-05 12:59:44 -04002869 ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002870
2871 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00002872 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00002873 * fs.ring_cookie and at the end of fs, but nowhere else.
2874 */
Alexander Duyck127fe532011-04-08 18:01:59 +00002875 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2876 sizeof(compat_rxnfc->fs.m_ext) !=
2877 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2878 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00002879 BUILD_BUG_ON(
2880 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2881 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2882 offsetof(struct ethtool_rxnfc, fs.location) -
2883 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2884
2885 if (copy_in_user(rxnfc, compat_rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002886 (void __user *)(&rxnfc->fs.m_ext + 1) -
2887 (void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002888 copy_in_user(&rxnfc->fs.ring_cookie,
2889 &compat_rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002890 (void __user *)(&rxnfc->fs.location + 1) -
2891 (void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002892 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2893 sizeof(rxnfc->rule_cnt)))
2894 return -EFAULT;
2895 }
2896
Al Viro44c02a22017-10-05 12:59:44 -04002897 ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL);
Ben Hutchings3a7da392011-03-17 07:34:32 +00002898 if (ret)
2899 return ret;
2900
2901 if (convert_out) {
2902 if (copy_in_user(compat_rxnfc, rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002903 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2904 (const void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002905 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2906 &rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002907 (const void __user *)(&rxnfc->fs.location + 1) -
2908 (const void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002909 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2910 sizeof(rxnfc->rule_cnt)))
2911 return -EFAULT;
2912
2913 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2914 /* As an optimisation, we only copy the actual
2915 * number of rules that the underlying
2916 * function returned. Since Mallory might
2917 * change the rule count in user memory, we
2918 * check that it is less than the rule count
2919 * originally given (as the user buffer size),
2920 * which has been range-checked.
2921 */
2922 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2923 return -EFAULT;
2924 if (actual_rule_cnt < rule_cnt)
2925 rule_cnt = actual_rule_cnt;
2926 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2927 &rxnfc->rule_locs[0],
2928 rule_cnt * sizeof(u32)))
2929 return -EFAULT;
2930 }
2931 }
2932
2933 return 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002934}
2935
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002936static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2937{
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002938 compat_uptr_t uptr32;
Al Viro44c02a22017-10-05 12:59:44 -04002939 struct ifreq ifr;
2940 void __user *saved;
2941 int err;
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002942
Al Viro44c02a22017-10-05 12:59:44 -04002943 if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002944 return -EFAULT;
2945
2946 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2947 return -EFAULT;
2948
Al Viro44c02a22017-10-05 12:59:44 -04002949 saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc;
2950 ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002951
Al Viro44c02a22017-10-05 12:59:44 -04002952 err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL);
2953 if (!err) {
2954 ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved;
2955 if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq)))
2956 err = -EFAULT;
Joe Perchesccbd6a52010-05-14 10:58:26 +00002957 }
Al Viro44c02a22017-10-05 12:59:44 -04002958 return err;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002959}
2960
Ben Hutchings590d4692013-11-18 17:04:13 +00002961/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
2962static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08002963 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002964{
Al Viro44c02a22017-10-05 12:59:44 -04002965 struct ifreq ifreq;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002966 u32 data32;
2967
Al Viro44c02a22017-10-05 12:59:44 -04002968 if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002969 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04002970 if (get_user(data32, &u_ifreq32->ifr_data))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002971 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04002972 ifreq.ifr_data = compat_ptr(data32);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002973
Al Viro44c02a22017-10-05 12:59:44 -04002974 return dev_ioctl(net, cmd, &ifreq, NULL);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002975}
2976
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002977static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2978 struct compat_ifreq __user *uifr32)
2979{
2980 struct ifreq ifr;
2981 struct compat_ifmap __user *uifmap32;
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002982 int err;
2983
2984 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2985 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002986 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2987 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2988 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2989 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
2990 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
2991 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002992 if (err)
2993 return -EFAULT;
2994
Al Viro44c02a22017-10-05 12:59:44 -04002995 err = dev_ioctl(net, cmd, &ifr, NULL);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002996
2997 if (cmd == SIOCGIFMAP && !err) {
2998 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002999 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3000 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3001 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3002 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
3003 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
3004 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003005 if (err)
3006 err = -EFAULT;
3007 }
3008 return err;
3009}
3010
Arnd Bergmann7a229382009-11-06 23:00:29 -08003011struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003012 u32 rt_pad1;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003013 struct sockaddr rt_dst; /* target address */
3014 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3015 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003016 unsigned short rt_flags;
3017 short rt_pad2;
3018 u32 rt_pad3;
3019 unsigned char rt_tos;
3020 unsigned char rt_class;
3021 short rt_pad4;
3022 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003023 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003024 u32 rt_mtu; /* per route MTU/Window */
3025 u32 rt_window; /* Window clamping */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003026 unsigned short rt_irtt; /* Initial RTT */
3027};
3028
3029struct in6_rtmsg32 {
3030 struct in6_addr rtmsg_dst;
3031 struct in6_addr rtmsg_src;
3032 struct in6_addr rtmsg_gateway;
3033 u32 rtmsg_type;
3034 u16 rtmsg_dst_len;
3035 u16 rtmsg_src_len;
3036 u32 rtmsg_metric;
3037 u32 rtmsg_info;
3038 u32 rtmsg_flags;
3039 s32 rtmsg_ifindex;
3040};
3041
Arnd Bergmann6b960182009-11-06 23:10:54 -08003042static int routing_ioctl(struct net *net, struct socket *sock,
3043 unsigned int cmd, void __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003044{
3045 int ret;
3046 void *r = NULL;
3047 struct in6_rtmsg r6;
3048 struct rtentry r4;
3049 char devname[16];
3050 u32 rtdev;
3051 mm_segment_t old_fs = get_fs();
3052
Arnd Bergmann6b960182009-11-06 23:10:54 -08003053 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3054 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003055 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003056 3 * sizeof(struct in6_addr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003057 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3058 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3059 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3060 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3061 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3062 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3063 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003064
3065 r = (void *) &r6;
3066 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003067 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003068 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003069 3 * sizeof(struct sockaddr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003070 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3071 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3072 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3073 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3074 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3075 ret |= get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003076 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003077 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003078 r4.rt_dev = (char __user __force *)devname;
3079 devname[15] = 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003080 } else
3081 r4.rt_dev = NULL;
3082
3083 r = (void *) &r4;
3084 }
3085
3086 if (ret) {
3087 ret = -EFAULT;
3088 goto out;
3089 }
3090
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003091 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003092 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003093 set_fs(old_fs);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003094
3095out:
Arnd Bergmann7a229382009-11-06 23:00:29 -08003096 return ret;
3097}
3098
3099/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3100 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003101 * use compatible ioctls
Arnd Bergmann7a229382009-11-06 23:00:29 -08003102 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003103static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003104{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003105 compat_ulong_t tmp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003106
Arnd Bergmann6b960182009-11-06 23:10:54 -08003107 if (get_user(tmp, argp))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003108 return -EFAULT;
3109 if (tmp == BRCTL_GET_VERSION)
3110 return BRCTL_VERSION + 1;
3111 return -EINVAL;
3112}
3113
Arnd Bergmann6b960182009-11-06 23:10:54 -08003114static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3115 unsigned int cmd, unsigned long arg)
3116{
3117 void __user *argp = compat_ptr(arg);
3118 struct sock *sk = sock->sk;
3119 struct net *net = sock_net(sk);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003120
Arnd Bergmann6b960182009-11-06 23:10:54 -08003121 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003122 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003123
Arnd Bergmann6b960182009-11-06 23:10:54 -08003124 switch (cmd) {
3125 case SIOCSIFBR:
3126 case SIOCGIFBR:
3127 return old_bridge_ioctl(argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003128 case SIOCGIFCONF:
Al Viro36fd6332017-06-26 13:19:16 -04003129 return compat_dev_ifconf(net, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003130 case SIOCETHTOOL:
3131 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003132 case SIOCWANDEV:
3133 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003134 case SIOCGIFMAP:
3135 case SIOCSIFMAP:
3136 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003137 case SIOCADDRT:
3138 case SIOCDELRT:
3139 return routing_ioctl(net, sock, cmd, argp);
3140 case SIOCGSTAMP:
3141 return do_siocgstamp(net, sock, cmd, argp);
3142 case SIOCGSTAMPNS:
3143 return do_siocgstampns(net, sock, cmd, argp);
Ben Hutchings590d4692013-11-18 17:04:13 +00003144 case SIOCBONDSLAVEINFOQUERY:
3145 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003146 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003147 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003148 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003149
Arnd Bergmann6b960182009-11-06 23:10:54 -08003150 case FIOSETOWN:
3151 case SIOCSPGRP:
3152 case FIOGETOWN:
3153 case SIOCGPGRP:
3154 case SIOCBRADDBR:
3155 case SIOCBRDELBR:
3156 case SIOCGIFVLAN:
3157 case SIOCSIFVLAN:
3158 case SIOCADDDLCI:
3159 case SIOCDELDLCI:
Andrey Vaginc62cce22016-10-24 18:29:13 -07003160 case SIOCGSKNS:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003161 return sock_ioctl(file, cmd, arg);
3162
3163 case SIOCGIFFLAGS:
3164 case SIOCSIFFLAGS:
3165 case SIOCGIFMETRIC:
3166 case SIOCSIFMETRIC:
3167 case SIOCGIFMTU:
3168 case SIOCSIFMTU:
3169 case SIOCGIFMEM:
3170 case SIOCSIFMEM:
3171 case SIOCGIFHWADDR:
3172 case SIOCSIFHWADDR:
3173 case SIOCADDMULTI:
3174 case SIOCDELMULTI:
3175 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003176 case SIOCGIFADDR:
3177 case SIOCSIFADDR:
3178 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003179 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003180 case SIOCGIFBRDADDR:
3181 case SIOCSIFBRDADDR:
3182 case SIOCGIFDSTADDR:
3183 case SIOCSIFDSTADDR:
3184 case SIOCGIFNETMASK:
3185 case SIOCSIFNETMASK:
3186 case SIOCSIFPFLAGS:
3187 case SIOCGIFPFLAGS:
3188 case SIOCGIFTXQLEN:
3189 case SIOCSIFTXQLEN:
3190 case SIOCBRADDIF:
3191 case SIOCBRDELIF:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003192 case SIOCSIFNAME:
3193 case SIOCGMIIPHY:
3194 case SIOCGMIIREG:
3195 case SIOCSMIIREG:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003196 case SIOCSARP:
3197 case SIOCGARP:
3198 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003199 case SIOCATMARK:
Al Virof92d4fc2017-09-30 19:32:17 -04003200 case SIOCBONDENSLAVE:
3201 case SIOCBONDRELEASE:
3202 case SIOCBONDSETHWADDR:
3203 case SIOCBONDCHANGEACTIVE:
Al Viro4cf808e72017-10-01 21:12:09 -04003204 case SIOCGIFNAME:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003205 return sock_do_ioctl(net, sock, cmd, arg);
3206 }
3207
Arnd Bergmann6b960182009-11-06 23:10:54 -08003208 return -ENOIOCTLCMD;
3209}
Arnd Bergmann7a229382009-11-06 23:00:29 -08003210
Eric Dumazet95c96172012-04-15 05:58:06 +00003211static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003212 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003213{
3214 struct socket *sock = file->private_data;
3215 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003216 struct sock *sk;
3217 struct net *net;
3218
3219 sk = sock->sk;
3220 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003221
3222 if (sock->ops->compat_ioctl)
3223 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3224
David S. Miller87de87d2008-06-03 09:14:03 -07003225 if (ret == -ENOIOCTLCMD &&
3226 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3227 ret = compat_wext_handle_ioctl(net, cmd, arg);
3228
Arnd Bergmann6b960182009-11-06 23:10:54 -08003229 if (ret == -ENOIOCTLCMD)
3230 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3231
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003232 return ret;
3233}
3234#endif
3235
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003236int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3237{
3238 return sock->ops->bind(sock, addr, addrlen);
3239}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003240EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003241
3242int kernel_listen(struct socket *sock, int backlog)
3243{
3244 return sock->ops->listen(sock, backlog);
3245}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003246EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003247
3248int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3249{
3250 struct sock *sk = sock->sk;
3251 int err;
3252
3253 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3254 newsock);
3255 if (err < 0)
3256 goto done;
3257
David Howellscdfbabf2017-03-09 08:09:05 +00003258 err = sock->ops->accept(sock, *newsock, flags, true);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003259 if (err < 0) {
3260 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003261 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003262 goto done;
3263 }
3264
3265 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003266 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003267
3268done:
3269 return err;
3270}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003271EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003272
3273int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003274 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003275{
3276 return sock->ops->connect(sock, addr, addrlen, flags);
3277}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003278EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003279
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003280int kernel_getsockname(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003281{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003282 return sock->ops->getname(sock, addr, 0);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003283}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003284EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003285
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003286int kernel_getpeername(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003287{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003288 return sock->ops->getname(sock, addr, 1);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003289}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003290EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003291
3292int kernel_getsockopt(struct socket *sock, int level, int optname,
3293 char *optval, int *optlen)
3294{
3295 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003296 char __user *uoptval;
3297 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003298 int err;
3299
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003300 uoptval = (char __user __force *) optval;
3301 uoptlen = (int __user __force *) optlen;
3302
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003303 set_fs(KERNEL_DS);
3304 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003305 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003306 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003307 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3308 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003309 set_fs(oldfs);
3310 return err;
3311}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003312EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003313
3314int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003315 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003316{
3317 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003318 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003319 int err;
3320
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003321 uoptval = (char __user __force *) optval;
3322
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003323 set_fs(KERNEL_DS);
3324 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003325 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003326 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003327 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003328 optlen);
3329 set_fs(oldfs);
3330 return err;
3331}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003332EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003333
3334int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3335 size_t size, int flags)
3336{
3337 if (sock->ops->sendpage)
3338 return sock->ops->sendpage(sock, page, offset, size, flags);
3339
3340 return sock_no_sendpage(sock, page, offset, size, flags);
3341}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003342EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003343
Tom Herbert306b13e2017-07-28 16:22:41 -07003344int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
3345 size_t size, int flags)
3346{
3347 struct socket *sock = sk->sk_socket;
3348
3349 if (sock->ops->sendpage_locked)
3350 return sock->ops->sendpage_locked(sk, page, offset, size,
3351 flags);
3352
3353 return sock_no_sendpage_locked(sk, page, offset, size, flags);
3354}
3355EXPORT_SYMBOL(kernel_sendpage_locked);
3356
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003357int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3358{
3359 return sock->ops->shutdown(sock, how);
3360}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003361EXPORT_SYMBOL(kernel_sock_shutdown);
R. Parameswaran113c3072017-04-05 16:50:35 -07003362
3363/* This routine returns the IP overhead imposed by a socket i.e.
3364 * the length of the underlying IP header, depending on whether
3365 * this is an IPv4 or IPv6 socket and the length from IP options turned
R. Parameswaran57240d02017-04-12 18:31:04 -07003366 * on at the socket. Assumes that the caller has a lock on the socket.
R. Parameswaran113c3072017-04-05 16:50:35 -07003367 */
3368u32 kernel_sock_ip_overhead(struct sock *sk)
3369{
3370 struct inet_sock *inet;
3371 struct ip_options_rcu *opt;
3372 u32 overhead = 0;
R. Parameswaran113c3072017-04-05 16:50:35 -07003373#if IS_ENABLED(CONFIG_IPV6)
3374 struct ipv6_pinfo *np;
3375 struct ipv6_txoptions *optv6 = NULL;
3376#endif /* IS_ENABLED(CONFIG_IPV6) */
3377
3378 if (!sk)
3379 return overhead;
3380
R. Parameswaran113c3072017-04-05 16:50:35 -07003381 switch (sk->sk_family) {
3382 case AF_INET:
3383 inet = inet_sk(sk);
3384 overhead += sizeof(struct iphdr);
3385 opt = rcu_dereference_protected(inet->inet_opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003386 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003387 if (opt)
3388 overhead += opt->opt.optlen;
3389 return overhead;
3390#if IS_ENABLED(CONFIG_IPV6)
3391 case AF_INET6:
3392 np = inet6_sk(sk);
3393 overhead += sizeof(struct ipv6hdr);
3394 if (np)
3395 optv6 = rcu_dereference_protected(np->opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003396 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003397 if (optv6)
3398 overhead += (optv6->opt_flen + optv6->opt_nflen);
3399 return overhead;
3400#endif /* IS_ENABLED(CONFIG_IPV6) */
3401 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
3402 return overhead;
3403 }
3404}
3405EXPORT_SYMBOL(kernel_sock_ip_overhead);