blob: 1de96abd78d3e55100100088991dacf876997846 [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>
Jeremy Clinec8e8cd52018-07-27 22:43:01 +000092#include <linux/nospec.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080094#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070095#include <asm/unistd.h>
96
97#include <net/compat.h>
David S. Miller87de87d2008-06-03 09:14:03 -070098#include <net/wext.h>
Herbert Xuf8451722010-05-24 00:12:34 -070099#include <net/cls_cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101#include <net/sock.h>
102#include <linux/netfilter.h>
103
Arnd Bergmann6b960182009-11-06 23:10:54 -0800104#include <linux/if_tun.h>
105#include <linux/ipv6_route.h>
106#include <linux/route.h>
Arnd Bergmann6b960182009-11-06 23:10:54 -0800107#include <linux/sockios.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +0300108#include <net/busy_poll.h>
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400109#include <linux/errqueue.h>
Eliezer Tamir06021292013-06-10 11:39:50 +0300110
Cong Wange0d10952013-08-01 11:10:25 +0800111#ifdef CONFIG_NET_RX_BUSY_POLL
Eliezer Tamir64b0dc52013-07-10 17:13:36 +0300112unsigned int sysctl_net_busy_read __read_mostly;
113unsigned int sysctl_net_busy_poll __read_mostly;
Eliezer Tamir06021292013-06-10 11:39:50 +0300114#endif
Arnd Bergmann6b960182009-11-06 23:10:54 -0800115
Al Viro8ae5e0302014-11-28 19:40:50 -0500116static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to);
117static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700118static int sock_mmap(struct file *file, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120static int sock_close(struct inode *inode, struct file *file);
Linus Torvaldsa11e1d42018-06-28 09:43:44 -0700121static __poll_t sock_poll(struct file *file,
122 struct poll_table_struct *wait);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700123static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800124#ifdef CONFIG_COMPAT
125static long compat_sock_ioctl(struct file *file,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700126 unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800127#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128static int sock_fasync(int fd, struct file *filp, int on);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129static ssize_t sock_sendpage(struct file *file, struct page *page,
130 int offset, size_t size, loff_t *ppos, int more);
Jens Axboe9c55e012007-11-06 23:30:13 -0800131static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700132 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800133 unsigned int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135/*
136 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
137 * in the operation structures but are done directly via the socketcall() multiplexor.
138 */
139
Arjan van de Venda7071d2007-02-12 00:55:36 -0800140static const struct file_operations socket_file_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 .owner = THIS_MODULE,
142 .llseek = no_llseek,
Al Viro8ae5e0302014-11-28 19:40:50 -0500143 .read_iter = sock_read_iter,
144 .write_iter = sock_write_iter,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 .poll = sock_poll,
146 .unlocked_ioctl = sock_ioctl,
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800147#ifdef CONFIG_COMPAT
148 .compat_ioctl = compat_sock_ioctl,
149#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 .mmap = sock_mmap,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 .release = sock_close,
152 .fasync = sock_fasync,
Jens Axboe5274f052006-03-30 15:15:30 +0200153 .sendpage = sock_sendpage,
154 .splice_write = generic_splice_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800155 .splice_read = sock_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156};
157
158/*
159 * The protocol list. Each protocol is registered in here.
160 */
161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162static DEFINE_SPINLOCK(net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +0000163static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700166 * Support routines.
167 * Move socket addresses back and forth across the kernel/user
168 * divide and look after the messy bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 */
170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171/**
172 * move_addr_to_kernel - copy a socket address into kernel space
173 * @uaddr: Address in user space
174 * @kaddr: Address in kernel space
175 * @ulen: Length in user space
176 *
177 * The address is copied into kernel space. If the provided address is
178 * too long an error code of -EINVAL is returned. If the copy gives
179 * invalid addresses -EFAULT is returned. On a success 0 is returned.
180 */
181
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000182int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700184 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700186 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700188 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100190 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191}
192
193/**
194 * move_addr_to_user - copy an address to user space
195 * @kaddr: kernel space address
196 * @klen: length of address in kernel
197 * @uaddr: user space address
198 * @ulen: pointer to user length field
199 *
200 * The value pointed to by ulen on entry is the buffer length available.
201 * This is overwritten with the buffer space used. -EINVAL is returned
202 * if an overlong buffer is specified or a negative buffer size. -EFAULT
203 * is returned if either the buffer or the length field are not
204 * accessible.
205 * After copying the data up to the limit the user specifies, the true
206 * length of the data is written over the length limit the user
207 * specified. Zero is returned for a success.
208 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700209
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000210static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
stephen hemminger11165f12010-10-18 14:27:29 +0000211 void __user *uaddr, int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212{
213 int err;
214 int len;
215
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100216 BUG_ON(klen > sizeof(struct sockaddr_storage));
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700217 err = get_user(len, ulen);
218 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700220 if (len > klen)
221 len = klen;
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100222 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700224 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500225 if (audit_sockaddr(klen, kaddr))
226 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700227 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 return -EFAULT;
229 }
230 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700231 * "fromlen shall refer to the value before truncation.."
232 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 */
234 return __put_user(klen, ulen);
235}
236
Alexey Dobriyan08009a72018-02-24 21:20:33 +0300237static struct kmem_cache *sock_inode_cachep __ro_after_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239static struct inode *sock_alloc_inode(struct super_block *sb)
240{
241 struct socket_alloc *ei;
Eric Dumazeteaefd1102011-02-18 03:26:36 +0000242 struct socket_wq *wq;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700243
Christoph Lametere94b1762006-12-06 20:33:17 -0800244 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 if (!ei)
246 return NULL;
Eric Dumazeteaefd1102011-02-18 03:26:36 +0000247 wq = kmalloc(sizeof(*wq), GFP_KERNEL);
248 if (!wq) {
Eric Dumazet43815482010-04-29 11:01:49 +0000249 kmem_cache_free(sock_inode_cachep, ei);
250 return NULL;
251 }
Eric Dumazeteaefd1102011-02-18 03:26:36 +0000252 init_waitqueue_head(&wq->wait);
253 wq->fasync_list = NULL;
Nicolai Stange574aab12015-12-29 13:29:55 +0100254 wq->flags = 0;
Christoph Hellwige6476c22018-07-30 09:45:07 +0200255 ei->socket.wq = wq;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 ei->socket.state = SS_UNCONNECTED;
258 ei->socket.flags = 0;
259 ei->socket.ops = NULL;
260 ei->socket.sk = NULL;
261 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263 return &ei->vfs_inode;
264}
265
266static void sock_destroy_inode(struct inode *inode)
267{
Eric Dumazet43815482010-04-29 11:01:49 +0000268 struct socket_alloc *ei;
269
270 ei = container_of(inode, struct socket_alloc, vfs_inode);
Christoph Hellwige6476c22018-07-30 09:45:07 +0200271 kfree_rcu(ei->socket.wq, rcu);
Eric Dumazet43815482010-04-29 11:01:49 +0000272 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273}
274
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700275static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700277 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
Christoph Lametera35afb82007-05-16 22:10:57 -0700279 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700281
yuan linyu1e911632017-01-07 17:18:31 +0800282static void init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283{
284 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700285 sizeof(struct socket_alloc),
286 0,
287 (SLAB_HWCACHE_ALIGN |
288 SLAB_RECLAIM_ACCOUNT |
Vladimir Davydov5d097052016-01-14 15:18:21 -0800289 SLAB_MEM_SPREAD | SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +0900290 init_once);
yuan linyu1e911632017-01-07 17:18:31 +0800291 BUG_ON(sock_inode_cachep == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292}
293
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700294static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700295 .alloc_inode = sock_alloc_inode,
296 .destroy_inode = sock_destroy_inode,
297 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298};
299
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700300/*
301 * sockfs_dname() is called from d_path().
302 */
303static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
304{
305 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
David Howellsc5ef6032015-03-17 22:26:16 +0000306 d_inode(dentry)->i_ino);
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700307}
308
Al Viro3ba13d12009-02-20 06:02:22 +0000309static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700310 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311};
312
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200313static int sockfs_xattr_get(const struct xattr_handler *handler,
314 struct dentry *dentry, struct inode *inode,
315 const char *suffix, void *value, size_t size)
316{
317 if (value) {
318 if (dentry->d_name.len + 1 > size)
319 return -ERANGE;
320 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
321 }
322 return dentry->d_name.len + 1;
323}
324
325#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
326#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
327#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
328
329static const struct xattr_handler sockfs_xattr_handler = {
330 .name = XATTR_NAME_SOCKPROTONAME,
331 .get = sockfs_xattr_get,
332};
333
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100334static int sockfs_security_xattr_set(const struct xattr_handler *handler,
335 struct dentry *dentry, struct inode *inode,
336 const char *suffix, const void *value,
337 size_t size, int flags)
338{
339 /* Handled by LSM. */
340 return -EAGAIN;
341}
342
343static const struct xattr_handler sockfs_security_xattr_handler = {
344 .prefix = XATTR_SECURITY_PREFIX,
345 .set = sockfs_security_xattr_set,
346};
347
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200348static const struct xattr_handler *sockfs_xattr_handlers[] = {
349 &sockfs_xattr_handler,
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100350 &sockfs_security_xattr_handler,
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200351 NULL
352};
353
Al Viroc74a1cb2011-01-12 16:59:34 -0500354static struct dentry *sockfs_mount(struct file_system_type *fs_type,
355 int flags, const char *dev_name, void *data)
356{
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200357 return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops,
358 sockfs_xattr_handlers,
359 &sockfs_dentry_operations, SOCKFS_MAGIC);
Al Viroc74a1cb2011-01-12 16:59:34 -0500360}
361
362static struct vfsmount *sock_mnt __read_mostly;
363
364static struct file_system_type sock_fs_type = {
365 .name = "sockfs",
366 .mount = sockfs_mount,
367 .kill_sb = kill_anon_super,
368};
369
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370/*
371 * Obtains the first available file descriptor and sets it up for use.
372 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800373 * These functions create file structures and maps them to fd space
374 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 * and file struct implicitly stored in sock->file.
376 * Note that another thread may close file descriptor before we return
377 * from this function. We use the fact that now we do not refer
378 * to socket after mapping. If one day we will need it, this
379 * function will increment ref. count on file by 1.
380 *
381 * In any case returned fd MAY BE not valid!
382 * This race condition is unavoidable
383 * with shared fd spaces, we cannot solve it inside kernel,
384 * but we take care of internal coherence yet.
385 */
386
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700387struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388{
Al Viro7cbe66b2009-08-05 19:59:08 +0400389 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800390
Al Virod93aa9d2018-06-09 09:40:05 -0400391 if (!dname)
392 dname = sock->sk ? sock->sk->sk_prot_creator->name : "";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Al Virod93aa9d2018-06-09 09:40:05 -0400394 file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname,
395 O_RDWR | (flags & O_NONBLOCK),
396 &socket_file_ops);
Viresh Kumarb5ffe632015-08-12 15:59:47 +0530397 if (IS_ERR(file)) {
Al Viro8e1611e2017-12-05 23:29:09 +0000398 sock_release(sock);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700399 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400400 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800401
402 sock->file = file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800403 file->private_data = sock;
Al Viro28407632012-08-17 23:54:15 -0400404 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800405}
Al Viro56b31d12012-08-18 00:25:51 -0400406EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800407
Al Viro56b31d12012-08-18 00:25:51 -0400408static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800409{
410 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400411 int fd = get_unused_fd_flags(flags);
Al Viroce4bb042018-01-10 18:47:05 -0500412 if (unlikely(fd < 0)) {
413 sock_release(sock);
Al Viro28407632012-08-17 23:54:15 -0400414 return fd;
Al Viroce4bb042018-01-10 18:47:05 -0500415 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800416
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700417 newfile = sock_alloc_file(sock, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -0400418 if (likely(!IS_ERR(newfile))) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800419 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400420 return fd;
421 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400422
Al Viro28407632012-08-17 23:54:15 -0400423 put_unused_fd(fd);
424 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425}
426
John Fastabend406a3c62012-07-20 10:39:25 +0000427struct socket *sock_from_file(struct file *file, int *err)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800428{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800429 if (file->f_op == &socket_file_ops)
430 return file->private_data; /* set in sock_map_fd */
431
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800432 *err = -ENOTSOCK;
433 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800434}
John Fastabend406a3c62012-07-20 10:39:25 +0000435EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700438 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 * @fd: file handle
440 * @err: pointer to an error code return
441 *
442 * The file handle passed in is locked and the socket it is bound
Rosen, Rami241c4662017-05-21 22:12:38 +0300443 * to is returned. If an error occurs the err pointer is overwritten
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 * with a negative errno code and NULL is returned. The function checks
445 * for both invalid handles and passing a handle which is not a socket.
446 *
447 * On a success the socket object pointer is returned.
448 */
449
450struct socket *sockfd_lookup(int fd, int *err)
451{
452 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 struct socket *sock;
454
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700455 file = fget(fd);
456 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 *err = -EBADF;
458 return NULL;
459 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700460
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800461 sock = sock_from_file(file, err);
462 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 return sock;
465}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700466EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800468static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
469{
Al Viro00e188e2014-03-03 23:48:18 -0500470 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800471 struct socket *sock;
472
Hua Zhong36725582006-04-19 15:25:02 -0700473 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500474 if (f.file) {
475 sock = sock_from_file(f.file, err);
476 if (likely(sock)) {
477 *fput_needed = f.flags;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800478 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500479 }
480 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800481 }
482 return NULL;
483}
484
Masatake YAMATO600e1772012-08-29 10:44:29 +0000485static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
486 size_t size)
487{
488 ssize_t len;
489 ssize_t used = 0;
490
David Howellsc5ef6032015-03-17 22:26:16 +0000491 len = security_inode_listsecurity(d_inode(dentry), buffer, size);
Masatake YAMATO600e1772012-08-29 10:44:29 +0000492 if (len < 0)
493 return len;
494 used += len;
495 if (buffer) {
496 if (size < used)
497 return -ERANGE;
498 buffer += len;
499 }
500
501 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
502 used += len;
503 if (buffer) {
504 if (size < used)
505 return -ERANGE;
506 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
507 buffer += len;
508 }
509
510 return used;
511}
512
Tobias Klauserdc647ec2017-01-10 09:30:51 +0100513static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr)
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900514{
515 int err = simple_setattr(dentry, iattr);
516
Eric Biggerse1a3a602016-12-30 17:42:32 -0600517 if (!err && (iattr->ia_valid & ATTR_UID)) {
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900518 struct socket *sock = SOCKET_I(d_inode(dentry));
519
Cong Wang6d8c50d2018-06-07 13:39:49 -0700520 if (sock->sk)
521 sock->sk->sk_uid = iattr->ia_uid;
522 else
523 err = -ENOENT;
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900524 }
525
526 return err;
527}
528
Masatake YAMATO600e1772012-08-29 10:44:29 +0000529static const struct inode_operations sockfs_inode_ops = {
Masatake YAMATO600e1772012-08-29 10:44:29 +0000530 .listxattr = sockfs_listxattr,
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900531 .setattr = sockfs_setattr,
Masatake YAMATO600e1772012-08-29 10:44:29 +0000532};
533
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534/**
535 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700536 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 * Allocate a new inode and socket object. The two are bound together
538 * and initialised. The socket is then returned. If we are out of inodes
539 * NULL is returned.
540 */
541
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800542struct socket *sock_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700544 struct inode *inode;
545 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200547 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 if (!inode)
549 return NULL;
550
551 sock = SOCKET_I(inode);
552
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400553 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700554 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100555 inode->i_uid = current_fsuid();
556 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000557 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 return sock;
560}
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800561EXPORT_SYMBOL(sock_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563/**
564 * sock_release - close a socket
565 * @sock: socket to close
566 *
567 * The socket is released from the protocol stack if it has a release
568 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700569 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700571
Cong Wang6d8c50d2018-06-07 13:39:49 -0700572static void __sock_release(struct socket *sock, struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573{
574 if (sock->ops) {
575 struct module *owner = sock->ops->owner;
576
Cong Wang6d8c50d2018-06-07 13:39:49 -0700577 if (inode)
578 inode_lock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 sock->ops->release(sock);
Cong Wang6d8c50d2018-06-07 13:39:49 -0700580 if (inode)
581 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 sock->ops = NULL;
583 module_put(owner);
584 }
585
Christoph Hellwige6476c22018-07-30 09:45:07 +0200586 if (sock->wq->fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800587 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 if (!sock->file) {
590 iput(SOCK_INODE(sock));
591 return;
592 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700593 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594}
Cong Wang6d8c50d2018-06-07 13:39:49 -0700595
596void sock_release(struct socket *sock)
597{
598 __sock_release(sock, NULL);
599}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700600EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400602void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000603{
Eric Dumazet140c55d2014-08-06 11:49:29 +0200604 u8 flags = *tx_flags;
605
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400606 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200607 flags |= SKBTX_HW_TSTAMP;
608
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400609 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200610 flags |= SKBTX_SW_TSTAMP;
611
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400612 if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200613 flags |= SKBTX_SCHED_TSTAMP;
614
Eric Dumazet140c55d2014-08-06 11:49:29 +0200615 *tx_flags = flags;
Patrick Ohly20d49472009-02-12 05:03:38 +0000616}
Willem de Bruijn67cc0d42014-09-08 19:58:58 -0400617EXPORT_SYMBOL(__sock_tx_timestamp);
Patrick Ohly20d49472009-02-12 05:03:38 +0000618
Al Virod8725c82014-12-11 00:02:50 -0500619static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620{
Al Viro01e97e62014-12-15 21:39:31 -0500621 int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg));
Al Virod8725c82014-12-11 00:02:50 -0500622 BUG_ON(ret == -EIOCBQUEUED);
623 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624}
Gu Zheng0cf00c62014-12-05 15:14:23 +0800625
Al Virod8725c82014-12-11 00:02:50 -0500626int sock_sendmsg(struct socket *sock, struct msghdr *msg)
Gu Zheng0cf00c62014-12-05 15:14:23 +0800627{
Al Virod8725c82014-12-11 00:02:50 -0500628 int err = security_socket_sendmsg(sock, msg,
Al Viro01e97e62014-12-15 21:39:31 -0500629 msg_data_left(msg));
Ying Xue1b784142015-03-02 15:37:48 +0800630
Al Virod8725c82014-12-11 00:02:50 -0500631 return err ?: sock_sendmsg_nosec(sock, msg);
Gu Zheng0cf00c62014-12-05 15:14:23 +0800632}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700633EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634
635int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
636 struct kvec *vec, size_t num, size_t size)
637{
David Howellsaa563d72018-10-20 00:57:56 +0100638 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Al Virod8725c82014-12-11 00:02:50 -0500639 return sock_sendmsg(sock, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700641EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Tom Herbert306b13e2017-07-28 16:22:41 -0700643int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
644 struct kvec *vec, size_t num, size_t size)
645{
646 struct socket *sock = sk->sk_socket;
647
648 if (!sock->ops->sendmsg_locked)
John Fastabenddb5980d2017-08-15 22:31:34 -0700649 return sock_no_sendmsg_locked(sk, msg, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700650
David Howellsaa563d72018-10-20 00:57:56 +0100651 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700652
653 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
654}
655EXPORT_SYMBOL(kernel_sendmsg_locked);
656
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400657static bool skb_is_err_queue(const struct sk_buff *skb)
658{
659 /* pkt_type of skbs enqueued on the error queue are set to
660 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
661 * in recvmsg, since skbs received on a local socket will never
662 * have a pkt_type of PACKET_OUTGOING.
663 */
664 return skb->pkt_type == PACKET_OUTGOING;
665}
666
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200667/* On transmit, software and hardware timestamps are returned independently.
668 * As the two skb clones share the hardware timestamp, which may be updated
669 * before the software timestamp is received, a hardware TX timestamp may be
670 * returned only if there is no software TX timestamp. Ignore false software
671 * timestamps, which may be made in the __sock_recv_timestamp() call when the
Deepa Dinamani7f1bc6e2019-02-02 07:34:46 -0800672 * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200673 * hardware timestamp.
674 */
675static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
676{
677 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb);
678}
679
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200680static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb)
681{
682 struct scm_ts_pktinfo ts_pktinfo;
683 struct net_device *orig_dev;
684
685 if (!skb_mac_header_was_set(skb))
686 return;
687
688 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo));
689
690 rcu_read_lock();
691 orig_dev = dev_get_by_napi_id(skb_napi_id(skb));
692 if (orig_dev)
693 ts_pktinfo.if_index = orig_dev->ifindex;
694 rcu_read_unlock();
695
696 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb);
697 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
698 sizeof(ts_pktinfo), &ts_pktinfo);
699}
700
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700701/*
702 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
703 */
704void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
705 struct sk_buff *skb)
706{
Patrick Ohly20d49472009-02-12 05:03:38 +0000707 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Deepa Dinamani887feae2019-02-02 07:34:50 -0800708 int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW);
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400709 struct scm_timestamping tss;
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200710 int empty = 1, false_tstamp = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000711 struct skb_shared_hwtstamps *shhwtstamps =
712 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700713
Patrick Ohly20d49472009-02-12 05:03:38 +0000714 /* Race occurred between timestamp enabling and packet
715 receiving. Fill in the current time for now. */
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200716 if (need_software_tstamp && skb->tstamp == 0) {
Patrick Ohly20d49472009-02-12 05:03:38 +0000717 __net_timestamp(skb);
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200718 false_tstamp = 1;
719 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000720
721 if (need_software_tstamp) {
722 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800723 if (new_tstamp) {
724 struct __kernel_sock_timeval tv;
725
726 skb_get_new_timestamp(skb, &tv);
727 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
728 sizeof(tv), &tv);
729 } else {
730 struct __kernel_old_timeval tv;
731
732 skb_get_timestamp(skb, &tv);
733 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
734 sizeof(tv), &tv);
735 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000736 } else {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800737 if (new_tstamp) {
738 struct __kernel_timespec ts;
739
740 skb_get_new_timestampns(skb, &ts);
741 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
742 sizeof(ts), &ts);
743 } else {
744 struct timespec ts;
745
746 skb_get_timestampns(skb, &ts);
747 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
748 sizeof(ts), &ts);
749 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000750 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700751 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000752
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400753 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400754 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400755 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000756 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400757 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400758 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200759 !skb_is_swtx_tstamp(skb, false_tstamp) &&
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200760 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) {
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400761 empty = 0;
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200762 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&
763 !skb_is_err_queue(skb))
764 put_ts_pktinfo(msg, skb);
765 }
Francis Yan1c885802016-11-27 23:07:18 -0800766 if (!empty) {
Patrick Ohly20d49472009-02-12 05:03:38 +0000767 put_cmsg(msg, SOL_SOCKET,
Deepa Dinamani7f1bc6e2019-02-02 07:34:46 -0800768 SO_TIMESTAMPING_OLD, sizeof(tss), &tss);
Francis Yan1c885802016-11-27 23:07:18 -0800769
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400770 if (skb_is_err_queue(skb) && skb->len &&
Soheil Hassas Yeganeh4ef1b282017-03-18 17:03:00 -0400771 SKB_EXT_ERR(skb)->opt_stats)
Francis Yan1c885802016-11-27 23:07:18 -0800772 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
773 skb->len, skb->data);
774 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700775}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300776EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
777
Johannes Berg6e3e9392011-11-09 10:15:42 +0100778void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
779 struct sk_buff *skb)
780{
781 int ack;
782
783 if (!sock_flag(sk, SOCK_WIFI_STATUS))
784 return;
785 if (!skb->wifi_acked_valid)
786 return;
787
788 ack = skb->wifi_acked;
789
790 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
791}
792EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
793
stephen hemminger11165f12010-10-18 14:27:29 +0000794static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
795 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700796{
Eyal Birger744d5a32015-03-01 14:58:31 +0200797 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
Neil Horman3b885782009-10-12 13:26:31 -0700798 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
Eyal Birger744d5a32015-03-01 14:58:31 +0200799 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
Neil Horman3b885782009-10-12 13:26:31 -0700800}
801
Eric Dumazet767dd032010-04-28 19:14:43 +0000802void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700803 struct sk_buff *skb)
804{
805 sock_recv_timestamp(msg, sk, skb);
806 sock_recv_drops(msg, sk, skb);
807}
Eric Dumazet767dd032010-04-28 19:14:43 +0000808EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700809
Ying Xue1b784142015-03-02 15:37:48 +0800810static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
Al Viro2da62902015-03-14 21:13:46 -0400811 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812{
Al Viro2da62902015-03-14 21:13:46 -0400813 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814}
815
Al Viro2da62902015-03-14 21:13:46 -0400816int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700817{
Al Viro2da62902015-03-14 21:13:46 -0400818 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700819
Al Viro2da62902015-03-14 21:13:46 -0400820 return err ?: sock_recvmsg_nosec(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700822EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000824/**
825 * kernel_recvmsg - Receive a message from a socket (kernel space)
826 * @sock: The socket to receive the message from
827 * @msg: Received message
828 * @vec: Input s/g array for message data
829 * @num: Size of input s/g array
830 * @size: Number of bytes to read
831 * @flags: Message flags (MSG_DONTWAIT, etc...)
832 *
833 * On return the msg structure contains the scatter/gather array passed in the
834 * vec argument. The array is modified so that it consists of the unfilled
835 * portion of the original array.
836 *
837 * The returned value is the total number of bytes received, or an error.
838 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700839int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
840 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841{
842 mm_segment_t oldfs = get_fs();
843 int result;
844
David Howellsaa563d72018-10-20 00:57:56 +0100845 iov_iter_kvec(&msg->msg_iter, READ, vec, num, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 set_fs(KERNEL_DS);
Al Viro2da62902015-03-14 21:13:46 -0400847 result = sock_recvmsg(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 set_fs(oldfs);
849 return result;
850}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700851EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300853static ssize_t sock_sendpage(struct file *file, struct page *page,
854 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855{
856 struct socket *sock;
857 int flags;
858
Eric Dumazetb69aee02005-09-06 14:42:45 -0700859 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
Eric Dumazet35f9c092012-04-05 03:05:35 +0000861 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
862 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
863 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
Linus Torvaldse6949582009-08-13 08:28:36 -0700865 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866}
867
Jens Axboe9c55e012007-11-06 23:30:13 -0800868static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700869 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800870 unsigned int flags)
871{
872 struct socket *sock = file->private_data;
873
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800874 if (unlikely(!sock->ops->splice_read))
Slavomir Kaslev95506582018-11-16 11:27:53 +0200875 return generic_file_splice_read(file, ppos, pipe, len, flags);
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800876
Jens Axboe9c55e012007-11-06 23:30:13 -0800877 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
878}
879
Al Viro8ae5e0302014-11-28 19:40:50 -0500880static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800881{
Al Viro6d652332015-01-30 16:12:56 -0500882 struct file *file = iocb->ki_filp;
883 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700884 struct msghdr msg = {.msg_iter = *to,
885 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -0500886 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800887
Al Viro8ae5e0302014-11-28 19:40:50 -0500888 if (file->f_flags & O_NONBLOCK)
889 msg.msg_flags = MSG_DONTWAIT;
890
891 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800892 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700893
Christoph Hellwig66ee59a2015-02-11 19:56:46 +0100894 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800895 return 0;
896
Al Viro2da62902015-03-14 21:13:46 -0400897 res = sock_recvmsg(sock, &msg, msg.msg_flags);
Al Viro8ae5e0302014-11-28 19:40:50 -0500898 *to = msg.msg_iter;
899 return res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800900}
901
Al Viro8ae5e0302014-11-28 19:40:50 -0500902static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903{
Al Viro6d652332015-01-30 16:12:56 -0500904 struct file *file = iocb->ki_filp;
905 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700906 struct msghdr msg = {.msg_iter = *from,
907 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -0500908 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800909
Al Viro8ae5e0302014-11-28 19:40:50 -0500910 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800911 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700912
Al Viro8ae5e0302014-11-28 19:40:50 -0500913 if (file->f_flags & O_NONBLOCK)
914 msg.msg_flags = MSG_DONTWAIT;
915
Al Viro6d652332015-01-30 16:12:56 -0500916 if (sock->type == SOCK_SEQPACKET)
917 msg.msg_flags |= MSG_EOR;
918
Al Virod8725c82014-12-11 00:02:50 -0500919 res = sock_sendmsg(sock, &msg);
Al Viro8ae5e0302014-11-28 19:40:50 -0500920 *from = msg.msg_iter;
921 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922}
923
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924/*
925 * Atomic setting of ioctl hooks to avoid race
926 * with module unload.
927 */
928
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800929static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700930static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931
Eric W. Biederman881d9662007-09-17 11:56:21 -0700932void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800934 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800936 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937}
938EXPORT_SYMBOL(brioctl_set);
939
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800940static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700941static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
Eric W. Biederman881d9662007-09-17 11:56:21 -0700943void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800945 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800947 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948}
949EXPORT_SYMBOL(vlan_ioctl_set);
950
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800951static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700952static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700954void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800956 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800958 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959}
960EXPORT_SYMBOL(dlci_ioctl_set);
961
Arnd Bergmann6b960182009-11-06 23:10:54 -0800962static long sock_do_ioctl(struct net *net, struct socket *sock,
Johannes Berg1cebf8f2018-09-13 14:40:55 +0200963 unsigned int cmd, unsigned long arg,
964 unsigned int ifreq_size)
Arnd Bergmann6b960182009-11-06 23:10:54 -0800965{
966 int err;
967 void __user *argp = (void __user *)arg;
968
969 err = sock->ops->ioctl(sock, cmd, arg);
970
971 /*
972 * If this ioctl is unknown try to hand it down
973 * to the NIC driver.
974 */
Al Viro36fd6332017-06-26 13:19:16 -0400975 if (err != -ENOIOCTLCMD)
976 return err;
Arnd Bergmann6b960182009-11-06 23:10:54 -0800977
Al Viro36fd6332017-06-26 13:19:16 -0400978 if (cmd == SIOCGIFCONF) {
979 struct ifconf ifc;
980 if (copy_from_user(&ifc, argp, sizeof(struct ifconf)))
981 return -EFAULT;
982 rtnl_lock();
983 err = dev_ifconf(net, &ifc, sizeof(struct ifreq));
984 rtnl_unlock();
985 if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf)))
986 err = -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -0400987 } else {
988 struct ifreq ifr;
989 bool need_copyout;
Johannes Berg1cebf8f2018-09-13 14:40:55 +0200990 if (copy_from_user(&ifr, argp, ifreq_size))
Al Viro44c02a22017-10-05 12:59:44 -0400991 return -EFAULT;
992 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
993 if (!err && need_copyout)
Johannes Berg1cebf8f2018-09-13 14:40:55 +0200994 if (copy_to_user(argp, &ifr, ifreq_size))
Al Viro44c02a22017-10-05 12:59:44 -0400995 return -EFAULT;
Al Viro36fd6332017-06-26 13:19:16 -0400996 }
Arnd Bergmann6b960182009-11-06 23:10:54 -0800997 return err;
998}
999
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000/*
1001 * With an ioctl, arg may well be a user mode pointer, but we don't know
1002 * what to do with it - that's up to the protocol still.
1003 */
1004
Kirill Tkhaid8d211a2018-02-14 16:39:56 +03001005struct ns_common *get_net_ns(struct ns_common *ns)
Andrey Vaginc62cce22016-10-24 18:29:13 -07001006{
1007 return &get_net(container_of(ns, struct net, ns))->ns;
1008}
Kirill Tkhaid8d211a2018-02-14 16:39:56 +03001009EXPORT_SYMBOL_GPL(get_net_ns);
Andrey Vaginc62cce22016-10-24 18:29:13 -07001010
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1012{
1013 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001014 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 void __user *argp = (void __user *)arg;
1016 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001017 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018
Eric Dumazetb69aee02005-09-06 14:42:45 -07001019 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001020 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001021 net = sock_net(sk);
Al Viro44c02a22017-10-05 12:59:44 -04001022 if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
1023 struct ifreq ifr;
1024 bool need_copyout;
1025 if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
1026 return -EFAULT;
1027 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
1028 if (!err && need_copyout)
1029 if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
1030 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001032#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Al Virob1b0c242017-10-01 20:13:08 -04001034 err = wext_handle_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001036#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001037 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 case FIOSETOWN:
1039 case SIOCSPGRP:
1040 err = -EFAULT;
1041 if (get_user(pid, (int __user *)argp))
1042 break;
Jiri Slaby393cc3f2017-06-13 13:35:50 +02001043 err = f_setown(sock->file, pid, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 break;
1045 case FIOGETOWN:
1046 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001047 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001048 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 break;
1050 case SIOCGIFBR:
1051 case SIOCSIFBR:
1052 case SIOCBRADDBR:
1053 case SIOCBRDELBR:
1054 err = -ENOPKG;
1055 if (!br_ioctl_hook)
1056 request_module("bridge");
1057
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001058 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001059 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001060 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001061 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 break;
1063 case SIOCGIFVLAN:
1064 case SIOCSIFVLAN:
1065 err = -ENOPKG;
1066 if (!vlan_ioctl_hook)
1067 request_module("8021q");
1068
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001069 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001071 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001072 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 case SIOCADDDLCI:
1075 case SIOCDELDLCI:
1076 err = -ENOPKG;
1077 if (!dlci_ioctl_hook)
1078 request_module("dlci");
1079
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001080 mutex_lock(&dlci_ioctl_mutex);
1081 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001083 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 break;
Andrey Vaginc62cce22016-10-24 18:29:13 -07001085 case SIOCGSKNS:
1086 err = -EPERM;
1087 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1088 break;
1089
1090 err = open_related_ns(&net->ns, get_net_ns);
1091 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 default:
Johannes Berg1cebf8f2018-09-13 14:40:55 +02001093 err = sock_do_ioctl(net, sock, cmd, arg,
1094 sizeof(struct ifreq));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001096 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 return err;
1098}
1099
1100int sock_create_lite(int family, int type, int protocol, struct socket **res)
1101{
1102 int err;
1103 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001104
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 err = security_socket_create(family, type, protocol, 1);
1106 if (err)
1107 goto out;
1108
1109 sock = sock_alloc();
1110 if (!sock) {
1111 err = -ENOMEM;
1112 goto out;
1113 }
1114
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001116 err = security_socket_post_create(sock, family, type, protocol, 1);
1117 if (err)
1118 goto out_release;
1119
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120out:
1121 *res = sock;
1122 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001123out_release:
1124 sock_release(sock);
1125 sock = NULL;
1126 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001128EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129
1130/* No kernel lock held - perfect */
Al Viroade994f2017-07-03 00:01:49 -04001131static __poll_t sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132{
Christoph Hellwig3cafb372018-01-09 16:07:34 +01001133 struct socket *sock = file->private_data;
Christoph Hellwiga331de32018-07-30 09:42:13 +02001134 __poll_t events = poll_requested_events(wait), flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135
Christoph Hellwige88958e2018-06-29 15:37:24 +02001136 if (!sock->ops->poll)
1137 return 0;
Christoph Hellwigf641f13b2018-07-30 09:42:12 +02001138
Christoph Hellwiga331de32018-07-30 09:42:13 +02001139 if (sk_can_busy_loop(sock->sk)) {
1140 /* poll once if requested by the syscall */
1141 if (events & POLL_BUSY_LOOP)
1142 sk_busy_loop(sock->sk, 1);
1143
1144 /* if this socket can poll_ll, tell the system call */
1145 flag = POLL_BUSY_LOOP;
1146 }
1147
1148 return sock->ops->poll(file, sock, wait) | flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149}
1150
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001151static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001153 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154
1155 return sock->ops->mmap(file, sock, vma);
1156}
1157
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001158static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159{
Cong Wang6d8c50d2018-06-07 13:39:49 -07001160 __sock_release(SOCKET_I(inode), inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 return 0;
1162}
1163
1164/*
1165 * Update the socket async list
1166 *
1167 * Fasync_list locking strategy.
1168 *
1169 * 1. fasync_list is modified only under process context socket lock
1170 * i.e. under semaphore.
1171 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001172 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 */
1174
1175static int sock_fasync(int fd, struct file *filp, int on)
1176{
Eric Dumazet989a2972010-04-14 09:55:35 +00001177 struct socket *sock = filp->private_data;
1178 struct sock *sk = sock->sk;
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001179 struct socket_wq *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180
Eric Dumazet989a2972010-04-14 09:55:35 +00001181 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183
1184 lock_sock(sk);
Christoph Hellwige6476c22018-07-30 09:45:07 +02001185 wq = sock->wq;
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001186 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001188 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001189 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001190 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001191 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192
Eric Dumazet989a2972010-04-14 09:55:35 +00001193 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 return 0;
1195}
1196
Eric Dumazetceb5d582015-11-29 20:03:11 -08001197/* This function may be called only under rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
Eric Dumazetceb5d582015-11-29 20:03:11 -08001199int sock_wake_async(struct socket_wq *wq, int how, int band)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200{
Eric Dumazetceb5d582015-11-29 20:03:11 -08001201 if (!wq || !wq->fasync_list)
1202 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001203
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001204 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001205 case SOCK_WAKE_WAITD:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001206 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 break;
1208 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001209 case SOCK_WAKE_SPACE:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001210 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 break;
1212 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001213 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001214call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001215 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001217 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001218 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08001220
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 return 0;
1222}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001223EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224
Pavel Emelyanov721db932010-09-29 16:06:32 +04001225int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001226 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227{
1228 int err;
1229 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001230 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231
1232 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001233 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 */
1235 if (family < 0 || family >= NPROTO)
1236 return -EAFNOSUPPORT;
1237 if (type < 0 || type >= SOCK_MAX)
1238 return -EINVAL;
1239
1240 /* Compatibility.
1241
1242 This uglymoron is moved from INET layer to here to avoid
1243 deadlock in module load.
1244 */
1245 if (family == PF_INET && type == SOCK_PACKET) {
liping.zhangf3c98692016-03-11 23:08:36 +08001246 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1247 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 family = PF_PACKET;
1249 }
1250
1251 err = security_socket_create(family, type, protocol, kern);
1252 if (err)
1253 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001254
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001255 /*
1256 * Allocate the socket and allow the family to set things up. if
1257 * the protocol is 0, the family is instructed to select an appropriate
1258 * default.
1259 */
1260 sock = sock_alloc();
1261 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001262 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001263 return -ENFILE; /* Not exactly a match, but its the
1264 closest posix thing */
1265 }
1266
1267 sock->type = type;
1268
Johannes Berg95a5afc2008-10-16 15:24:51 -07001269#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001270 /* Attempt to load a protocol module if the find failed.
1271 *
1272 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 * requested real, full-featured networking support upon configuration.
1274 * Otherwise module support will break!
1275 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001276 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001277 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278#endif
1279
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001280 rcu_read_lock();
1281 pf = rcu_dereference(net_families[family]);
1282 err = -EAFNOSUPPORT;
1283 if (!pf)
1284 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285
1286 /*
1287 * We will call the ->create function, that possibly is in a loadable
1288 * module, so we have to bump that loadable module refcnt first.
1289 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001290 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 goto out_release;
1292
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001293 /* Now protected by module ref count */
1294 rcu_read_unlock();
1295
Eric Paris3f378b62009-11-05 22:18:14 -08001296 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001297 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001299
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 /*
1301 * Now to bump the refcnt of the [loadable] module that owns this
1302 * socket at sock_release time we decrement its refcnt.
1303 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001304 if (!try_module_get(sock->ops->owner))
1305 goto out_module_busy;
1306
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 /*
1308 * Now that we're done with the ->create function, the [loadable]
1309 * module can have its refcnt decremented
1310 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001311 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001312 err = security_socket_post_create(sock, family, type, protocol, kern);
1313 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001314 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001315 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001317 return 0;
1318
1319out_module_busy:
1320 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001322 sock->ops = NULL;
1323 module_put(pf->owner);
1324out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001326 return err;
1327
1328out_release:
1329 rcu_read_unlock();
1330 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001332EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333
1334int sock_create(int family, int type, int protocol, struct socket **res)
1335{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001336 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001338EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001340int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341{
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001342 return __sock_create(net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001344EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001346int __sys_socket(int family, int type, int protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347{
1348 int retval;
1349 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001350 int flags;
1351
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001352 /* Check the SOCK_* constants for consistency. */
1353 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1354 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1355 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1356 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1357
Ulrich Dreppera677a032008-07-23 21:29:17 -07001358 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001359 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001360 return -EINVAL;
1361 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001363 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1364 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1365
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 retval = sock_create(family, type, protocol, &sock);
1367 if (retval < 0)
Al Viro8e1611e2017-12-05 23:29:09 +00001368 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369
Al Viro8e1611e2017-12-05 23:29:09 +00001370 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371}
1372
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001373SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1374{
1375 return __sys_socket(family, type, protocol);
1376}
1377
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378/*
1379 * Create a pair of connected sockets.
1380 */
1381
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001382int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383{
1384 struct socket *sock1, *sock2;
1385 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001386 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001387 int flags;
1388
1389 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001390 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001391 return -EINVAL;
1392 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001394 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1395 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1396
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 /*
Al Viro016a2662017-12-05 23:28:38 +00001398 * reserve descriptors and make sure we won't fail
1399 * to return them to userland.
1400 */
1401 fd1 = get_unused_fd_flags(flags);
1402 if (unlikely(fd1 < 0))
1403 return fd1;
1404
1405 fd2 = get_unused_fd_flags(flags);
1406 if (unlikely(fd2 < 0)) {
1407 put_unused_fd(fd1);
1408 return fd2;
1409 }
1410
1411 err = put_user(fd1, &usockvec[0]);
1412 if (err)
1413 goto out;
1414
1415 err = put_user(fd2, &usockvec[1]);
1416 if (err)
1417 goto out;
1418
1419 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 * Obtain the first socket and check if the underlying protocol
1421 * supports the socketpair call.
1422 */
1423
1424 err = sock_create(family, type, protocol, &sock1);
Al Viro016a2662017-12-05 23:28:38 +00001425 if (unlikely(err < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 goto out;
1427
1428 err = sock_create(family, type, protocol, &sock2);
Al Viro016a2662017-12-05 23:28:38 +00001429 if (unlikely(err < 0)) {
1430 sock_release(sock1);
1431 goto out;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001432 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001433
David Herrmannd47cd942018-05-04 16:28:20 +02001434 err = security_socket_socketpair(sock1, sock2);
1435 if (unlikely(err)) {
1436 sock_release(sock2);
1437 sock_release(sock1);
1438 goto out;
1439 }
1440
Al Viro016a2662017-12-05 23:28:38 +00001441 err = sock1->ops->socketpair(sock1, sock2);
1442 if (unlikely(err < 0)) {
1443 sock_release(sock2);
1444 sock_release(sock1);
1445 goto out;
Al Viro28407632012-08-17 23:54:15 -04001446 }
1447
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001448 newfile1 = sock_alloc_file(sock1, flags, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301449 if (IS_ERR(newfile1)) {
Al Viro28407632012-08-17 23:54:15 -04001450 err = PTR_ERR(newfile1);
Al Viro016a2662017-12-05 23:28:38 +00001451 sock_release(sock2);
1452 goto out;
Al Viro28407632012-08-17 23:54:15 -04001453 }
1454
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001455 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001456 if (IS_ERR(newfile2)) {
1457 err = PTR_ERR(newfile2);
Al Viro016a2662017-12-05 23:28:38 +00001458 fput(newfile1);
1459 goto out;
Al Virodb349502007-02-07 01:48:00 -05001460 }
1461
Al Viro157cf642008-12-14 04:57:47 -05001462 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001463
Al Virodb349502007-02-07 01:48:00 -05001464 fd_install(fd1, newfile1);
1465 fd_install(fd2, newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001466 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468out:
Al Viro016a2662017-12-05 23:28:38 +00001469 put_unused_fd(fd2);
1470 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 return err;
1472}
1473
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001474SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1475 int __user *, usockvec)
1476{
1477 return __sys_socketpair(family, type, protocol, usockvec);
1478}
1479
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480/*
1481 * Bind a name to a socket. Nothing much to do here since it's
1482 * the protocol's responsibility to handle the local address.
1483 *
1484 * We move the socket address to kernel space before we call
1485 * the protocol layer (having also checked the address is ok).
1486 */
1487
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001488int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489{
1490 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001491 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001492 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001494 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001495 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001496 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Jakub Sitnicki068b88c2018-10-04 11:09:40 +02001497 if (!err) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001498 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001499 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001500 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001501 if (!err)
1502 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001503 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001504 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001506 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001507 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 return err;
1509}
1510
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001511SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1512{
1513 return __sys_bind(fd, umyaddr, addrlen);
1514}
1515
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516/*
1517 * Perform a listen. Basically, we allow the protocol to do anything
1518 * necessary for a listen, and if that works, we mark the socket as
1519 * ready for listening.
1520 */
1521
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001522int __sys_listen(int fd, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523{
1524 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001525 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001526 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001527
1528 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1529 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001530 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001531 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001532 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533
1534 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001535 if (!err)
1536 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001538 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 }
1540 return err;
1541}
1542
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001543SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1544{
1545 return __sys_listen(fd, backlog);
1546}
1547
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548/*
1549 * For accept, we attempt to create a new socket, set up the link
1550 * with the client, wake up the client, then return the new
1551 * connected fd. We collect the address of the connector in kernel
1552 * space and move it to user at the very end. This is unclean because
1553 * we open the socket then return an error.
1554 *
1555 * 1003.1g adds the ability to recvmsg() to query connection pending
1556 * status to recvmsg. We need to add that support in a way thats
Geert Uytterhoevenb9030362018-03-02 14:43:23 +01001557 * clean when we restructure accept also.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558 */
1559
Dominik Brodowski4541e802018-03-13 19:24:23 +01001560int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
1561 int __user *upeer_addrlen, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562{
1563 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001564 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001565 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001566 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567
Ulrich Drepper77d27202008-07-23 21:29:35 -07001568 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001569 return -EINVAL;
1570
1571 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1572 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1573
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001574 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 if (!sock)
1576 goto out;
1577
1578 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001579 newsock = sock_alloc();
1580 if (!newsock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 goto out_put;
1582
1583 newsock->type = sock->type;
1584 newsock->ops = sock->ops;
1585
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 /*
1587 * We don't need try_module_get here, as the listening socket (sock)
1588 * has the protocol module (sock->ops->owner) held.
1589 */
1590 __module_get(newsock->ops->owner);
1591
Al Viro28407632012-08-17 23:54:15 -04001592 newfd = get_unused_fd_flags(flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001593 if (unlikely(newfd < 0)) {
1594 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001595 sock_release(newsock);
1596 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001597 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001598 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301599 if (IS_ERR(newfile)) {
Al Viro28407632012-08-17 23:54:15 -04001600 err = PTR_ERR(newfile);
1601 put_unused_fd(newfd);
Al Viro28407632012-08-17 23:54:15 -04001602 goto out_put;
1603 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001604
Frank Filza79af592005-09-27 15:23:38 -07001605 err = security_socket_accept(sock, newsock);
1606 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001607 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001608
David Howellscdfbabf2017-03-09 08:09:05 +00001609 err = sock->ops->accept(sock, newsock, sock->file->f_flags, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001611 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612
1613 if (upeer_sockaddr) {
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001614 len = newsock->ops->getname(newsock,
1615 (struct sockaddr *)&address, 2);
1616 if (len < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001618 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001620 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001621 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001623 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 }
1625
1626 /* File flags are not inherited via accept() unlike another OSes. */
1627
David S. Miller39d8c1b2006-03-20 17:13:49 -08001628 fd_install(newfd, newfile);
1629 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001632 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633out:
1634 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001635out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001636 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001637 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 goto out_put;
1639}
1640
Dominik Brodowski4541e802018-03-13 19:24:23 +01001641SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1642 int __user *, upeer_addrlen, int, flags)
1643{
1644 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
1645}
1646
Heiko Carstens20f37032009-01-14 14:14:23 +01001647SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1648 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001649{
Dominik Brodowski4541e802018-03-13 19:24:23 +01001650 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001651}
1652
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653/*
1654 * Attempt to connect to a socket with the server address. The address
1655 * is in user space so we verify it is OK and move it to kernel space.
1656 *
1657 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1658 * break bindings
1659 *
1660 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1661 * other SEQPACKET protocols that take time to connect() as it doesn't
1662 * include the -EINPROGRESS status for such sockets.
1663 */
1664
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01001665int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666{
1667 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001668 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001669 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001671 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672 if (!sock)
1673 goto out;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001674 err = move_addr_to_kernel(uservaddr, addrlen, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 if (err < 0)
1676 goto out_put;
1677
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001678 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001679 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680 if (err)
1681 goto out_put;
1682
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001683 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 sock->file->f_flags);
1685out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001686 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687out:
1688 return err;
1689}
1690
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01001691SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1692 int, addrlen)
1693{
1694 return __sys_connect(fd, uservaddr, addrlen);
1695}
1696
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697/*
1698 * Get the local address ('name') of a socket object. Move the obtained
1699 * name to user space.
1700 */
1701
Dominik Brodowski8882a102018-03-13 19:43:14 +01001702int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1703 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704{
1705 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001706 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001707 int err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001708
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001709 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710 if (!sock)
1711 goto out;
1712
1713 err = security_socket_getsockname(sock);
1714 if (err)
1715 goto out_put;
1716
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001717 err = sock->ops->getname(sock, (struct sockaddr *)&address, 0);
1718 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719 goto out_put;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001720 /* "err" is actually length in this case */
1721 err = move_addr_to_user(&address, err, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722
1723out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001724 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725out:
1726 return err;
1727}
1728
Dominik Brodowski8882a102018-03-13 19:43:14 +01001729SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1730 int __user *, usockaddr_len)
1731{
1732 return __sys_getsockname(fd, usockaddr, usockaddr_len);
1733}
1734
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735/*
1736 * Get the remote address ('name') of a socket object. Move the obtained
1737 * name to user space.
1738 */
1739
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001740int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1741 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742{
1743 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001744 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001745 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001747 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1748 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 err = security_socket_getpeername(sock);
1750 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001751 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 return err;
1753 }
1754
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001755 err = sock->ops->getname(sock, (struct sockaddr *)&address, 1);
1756 if (err >= 0)
1757 /* "err" is actually length in this case */
1758 err = move_addr_to_user(&address, err, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001759 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001760 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761 }
1762 return err;
1763}
1764
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001765SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1766 int __user *, usockaddr_len)
1767{
1768 return __sys_getpeername(fd, usockaddr, usockaddr_len);
1769}
1770
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771/*
1772 * Send a datagram to a given address. We move the address into kernel
1773 * space and check the user space data area is readable before invoking
1774 * the protocol.
1775 */
Dominik Brodowski211b6342018-03-13 19:18:52 +01001776int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
1777 struct sockaddr __user *addr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778{
1779 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001780 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781 int err;
1782 struct msghdr msg;
1783 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001784 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001785
Al Viro602bd0e2015-03-21 19:12:32 -04001786 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
1787 if (unlikely(err))
1788 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001789 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1790 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001791 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001792
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001793 msg.msg_name = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001794 msg.msg_control = NULL;
1795 msg.msg_controllen = 0;
1796 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001797 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001798 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799 if (err < 0)
1800 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001801 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001802 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 }
1804 if (sock->file->f_flags & O_NONBLOCK)
1805 flags |= MSG_DONTWAIT;
1806 msg.msg_flags = flags;
Al Virod8725c82014-12-11 00:02:50 -05001807 err = sock_sendmsg(sock, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001809out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001810 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001811out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812 return err;
1813}
1814
Dominik Brodowski211b6342018-03-13 19:18:52 +01001815SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1816 unsigned int, flags, struct sockaddr __user *, addr,
1817 int, addr_len)
1818{
1819 return __sys_sendto(fd, buff, len, flags, addr, addr_len);
1820}
1821
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001823 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824 */
1825
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001826SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001827 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828{
Dominik Brodowski211b6342018-03-13 19:18:52 +01001829 return __sys_sendto(fd, buff, len, flags, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830}
1831
1832/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001833 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834 * sender. We verify the buffers are writable and if needed move the
1835 * sender address from kernel to user space.
1836 */
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01001837int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
1838 struct sockaddr __user *addr, int __user *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839{
1840 struct socket *sock;
1841 struct iovec iov;
1842 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001843 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001844 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001845 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846
Al Viro602bd0e2015-03-21 19:12:32 -04001847 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
1848 if (unlikely(err))
1849 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001850 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001852 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001854 msg.msg_control = NULL;
1855 msg.msg_controllen = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01001856 /* Save some cycles and don't copy the address if not needed */
1857 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1858 /* We assume all kernel code knows the size of sockaddr_storage */
1859 msg.msg_namelen = 0;
tadeusz.struk@intel.com130ed5d2015-12-15 10:46:17 -08001860 msg.msg_iocb = NULL;
Alexander Potapenko9f138fa2017-03-08 18:08:16 +01001861 msg.msg_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862 if (sock->file->f_flags & O_NONBLOCK)
1863 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04001864 err = sock_recvmsg(sock, &msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001866 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001867 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001868 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001869 if (err2 < 0)
1870 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001872
1873 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001874out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 return err;
1876}
1877
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01001878SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1879 unsigned int, flags, struct sockaddr __user *, addr,
1880 int __user *, addr_len)
1881{
1882 return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len);
1883}
1884
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001886 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 */
1888
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02001889SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1890 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891{
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01001892 return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893}
1894
1895/*
1896 * Set a socket option. Because we don't know the option lengths we have
1897 * to pass the user mode parameter for the protocols to sort out.
1898 */
1899
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01001900static int __sys_setsockopt(int fd, int level, int optname,
1901 char __user *optval, int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001903 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904 struct socket *sock;
1905
1906 if (optlen < 0)
1907 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001908
1909 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1910 if (sock != NULL) {
1911 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001912 if (err)
1913 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914
1915 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001916 err =
1917 sock_setsockopt(sock, level, optname, optval,
1918 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001920 err =
1921 sock->ops->setsockopt(sock, level, optname, optval,
1922 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001923out_put:
1924 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925 }
1926 return err;
1927}
1928
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01001929SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1930 char __user *, optval, int, optlen)
1931{
1932 return __sys_setsockopt(fd, level, optname, optval, optlen);
1933}
1934
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935/*
1936 * Get a socket option. Because we don't know the option lengths we have
1937 * to pass a user mode parameter for the protocols to sort out.
1938 */
1939
Dominik Brodowski13a2d702018-03-13 20:15:04 +01001940static int __sys_getsockopt(int fd, int level, int optname,
1941 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001943 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944 struct socket *sock;
1945
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001946 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1947 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001948 err = security_socket_getsockopt(sock, level, optname);
1949 if (err)
1950 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951
1952 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001953 err =
1954 sock_getsockopt(sock, level, optname, optval,
1955 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001957 err =
1958 sock->ops->getsockopt(sock, level, optname, optval,
1959 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001960out_put:
1961 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 }
1963 return err;
1964}
1965
Dominik Brodowski13a2d702018-03-13 20:15:04 +01001966SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1967 char __user *, optval, int __user *, optlen)
1968{
1969 return __sys_getsockopt(fd, level, optname, optval, optlen);
1970}
1971
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972/*
1973 * Shutdown a socket.
1974 */
1975
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01001976int __sys_shutdown(int fd, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001978 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979 struct socket *sock;
1980
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001981 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1982 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001984 if (!err)
1985 err = sock->ops->shutdown(sock, how);
1986 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987 }
1988 return err;
1989}
1990
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01001991SYSCALL_DEFINE2(shutdown, int, fd, int, how)
1992{
1993 return __sys_shutdown(fd, how);
1994}
1995
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001996/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997 * fields which are the same type (int / unsigned) on our platforms.
1998 */
1999#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
2000#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
2001#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
2002
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002003struct used_address {
2004 struct sockaddr_storage name;
2005 unsigned int name_len;
2006};
2007
Al Viroda184282015-03-21 19:29:06 -04002008static int copy_msghdr_from_user(struct msghdr *kmsg,
2009 struct user_msghdr __user *umsg,
2010 struct sockaddr __user **save_addr,
2011 struct iovec **iov)
Dan Carpenter1661bf32013-10-03 00:27:20 +03002012{
Al Viroffb07552017-06-27 19:32:04 -04002013 struct user_msghdr msg;
Al Viro08adb7d2014-11-10 20:23:13 -05002014 ssize_t err;
2015
Al Viroffb07552017-06-27 19:32:04 -04002016 if (copy_from_user(&msg, umsg, sizeof(*umsg)))
Dan Carpenter1661bf32013-10-03 00:27:20 +03002017 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00002018
Paolo Abeni864d9662017-07-21 18:49:45 +02002019 kmsg->msg_control = (void __force *)msg.msg_control;
Al Viroffb07552017-06-27 19:32:04 -04002020 kmsg->msg_controllen = msg.msg_controllen;
2021 kmsg->msg_flags = msg.msg_flags;
2022
2023 kmsg->msg_namelen = msg.msg_namelen;
2024 if (!msg.msg_name)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07002025 kmsg->msg_namelen = 0;
2026
Matthew Leachdbb490b2014-03-11 11:58:27 +00002027 if (kmsg->msg_namelen < 0)
2028 return -EINVAL;
2029
Dan Carpenter1661bf32013-10-03 00:27:20 +03002030 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03002031 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05002032
2033 if (save_addr)
Al Viroffb07552017-06-27 19:32:04 -04002034 *save_addr = msg.msg_name;
Al Viro08adb7d2014-11-10 20:23:13 -05002035
Al Viroffb07552017-06-27 19:32:04 -04002036 if (msg.msg_name && kmsg->msg_namelen) {
Al Viro08adb7d2014-11-10 20:23:13 -05002037 if (!save_addr) {
Paolo Abeni864d9662017-07-21 18:49:45 +02002038 err = move_addr_to_kernel(msg.msg_name,
2039 kmsg->msg_namelen,
Al Viro08adb7d2014-11-10 20:23:13 -05002040 kmsg->msg_name);
2041 if (err < 0)
2042 return err;
2043 }
2044 } else {
2045 kmsg->msg_name = NULL;
2046 kmsg->msg_namelen = 0;
2047 }
2048
Al Viroffb07552017-06-27 19:32:04 -04002049 if (msg.msg_iovlen > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05002050 return -EMSGSIZE;
2051
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002052 kmsg->msg_iocb = NULL;
2053
Al Viroffb07552017-06-27 19:32:04 -04002054 return import_iovec(save_addr ? READ : WRITE,
2055 msg.msg_iov, msg.msg_iovlen,
Al Viroda184282015-03-21 19:29:06 -04002056 UIO_FASTIOV, iov, &kmsg->msg_iter);
Dan Carpenter1661bf32013-10-03 00:27:20 +03002057}
2058
Al Viro666547f2014-04-06 14:03:05 -04002059static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002060 struct msghdr *msg_sys, unsigned int flags,
Tom Herbert28a94d82016-03-07 14:11:02 -08002061 struct used_address *used_address,
2062 unsigned int allowed_msghdr_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002064 struct compat_msghdr __user *msg_compat =
2065 (struct compat_msghdr __user *)msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002066 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07002068 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Amit Kushwaha846cc122016-12-08 18:21:53 +05302069 __aligned(sizeof(__kernel_size_t));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002070 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071 unsigned char *ctl_buf = ctl;
Al Virod8725c82014-12-11 00:02:50 -05002072 int ctl_len;
Al Viro08adb7d2014-11-10 20:23:13 -05002073 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002074
Al Viro08adb7d2014-11-10 20:23:13 -05002075 msg_sys->msg_name = &address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076
Al Viro08449322014-11-09 22:33:45 -05002077 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002078 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
Al Viro08449322014-11-09 22:33:45 -05002079 else
Al Viro08adb7d2014-11-10 20:23:13 -05002080 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002081 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04002082 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083
2084 err = -ENOBUFS;
2085
Anton Blanchard228e5482011-05-02 20:21:35 +00002086 if (msg_sys->msg_controllen > INT_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087 goto out_freeiov;
Tom Herbert28a94d82016-03-07 14:11:02 -08002088 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
Anton Blanchard228e5482011-05-02 20:21:35 +00002089 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002091 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00002092 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002093 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094 if (err)
2095 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00002096 ctl_buf = msg_sys->msg_control;
2097 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098 } else if (ctl_len) {
David S. Millerac4340f2017-01-04 13:24:19 -05002099 BUILD_BUG_ON(sizeof(struct cmsghdr) !=
2100 CMSG_ALIGN(sizeof(struct cmsghdr)));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002101 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002103 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002104 goto out_freeiov;
2105 }
2106 err = -EFAULT;
2107 /*
Anton Blanchard228e5482011-05-02 20:21:35 +00002108 * Careful! Before this, msg_sys->msg_control contains a user pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2110 * checking falls down on this.
2111 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00002112 if (copy_from_user(ctl_buf,
Anton Blanchard228e5482011-05-02 20:21:35 +00002113 (void __user __force *)msg_sys->msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002114 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00002116 msg_sys->msg_control = ctl_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002117 }
Anton Blanchard228e5482011-05-02 20:21:35 +00002118 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119
2120 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00002121 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002122 /*
2123 * If this is sendmmsg() and current destination address is same as
2124 * previously succeeded address, omit asking LSM's decision.
2125 * used_address->name_len is initialized to UINT_MAX so that the first
2126 * destination address never matches.
2127 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002128 if (used_address && msg_sys->msg_name &&
2129 used_address->name_len == msg_sys->msg_namelen &&
2130 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002131 used_address->name_len)) {
Al Virod8725c82014-12-11 00:02:50 -05002132 err = sock_sendmsg_nosec(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002133 goto out_freectl;
2134 }
Al Virod8725c82014-12-11 00:02:50 -05002135 err = sock_sendmsg(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002136 /*
2137 * If this is sendmmsg() and sending to current destination address was
2138 * successful, remember it.
2139 */
2140 if (used_address && err >= 0) {
2141 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002142 if (msg_sys->msg_name)
2143 memcpy(&used_address->name, msg_sys->msg_name,
2144 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002145 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002146
2147out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002148 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2150out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04002151 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00002152 return err;
2153}
2154
2155/*
2156 * BSD sendmsg interface
2157 */
2158
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002159long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2160 bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002161{
2162 int fput_needed, err;
2163 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002164 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00002165
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002166 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2167 return -EINVAL;
2168
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002169 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00002170 if (!sock)
2171 goto out;
2172
Tom Herbert28a94d82016-03-07 14:11:02 -08002173 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
Anton Blanchard228e5482011-05-02 20:21:35 +00002174
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002175 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002176out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177 return err;
2178}
2179
Al Viro666547f2014-04-06 14:03:05 -04002180SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002181{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002182 return __sys_sendmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002183}
2184
Anton Blanchard228e5482011-05-02 20:21:35 +00002185/*
2186 * Linux sendmmsg interface
2187 */
2188
2189int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002190 unsigned int flags, bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002191{
2192 int fput_needed, err, datagrams;
2193 struct socket *sock;
2194 struct mmsghdr __user *entry;
2195 struct compat_mmsghdr __user *compat_entry;
2196 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002197 struct used_address used_address;
Tom Herbertf0922762016-03-07 14:11:03 -08002198 unsigned int oflags = flags;
Anton Blanchard228e5482011-05-02 20:21:35 +00002199
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002200 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2201 return -EINVAL;
2202
Anton Blanchard98382f42011-08-04 14:07:39 +00002203 if (vlen > UIO_MAXIOV)
2204 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002205
2206 datagrams = 0;
2207
2208 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2209 if (!sock)
2210 return err;
2211
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002212 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002213 entry = mmsg;
2214 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002215 err = 0;
Tom Herbertf0922762016-03-07 14:11:03 -08002216 flags |= MSG_BATCH;
Anton Blanchard228e5482011-05-02 20:21:35 +00002217
2218 while (datagrams < vlen) {
Tom Herbertf0922762016-03-07 14:11:03 -08002219 if (datagrams == vlen - 1)
2220 flags = oflags;
2221
Anton Blanchard228e5482011-05-02 20:21:35 +00002222 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002223 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002224 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002225 if (err < 0)
2226 break;
2227 err = __put_user(err, &compat_entry->msg_len);
2228 ++compat_entry;
2229 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002230 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002231 (struct user_msghdr __user *)entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002232 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002233 if (err < 0)
2234 break;
2235 err = put_user(err, &entry->msg_len);
2236 ++entry;
2237 }
2238
2239 if (err)
2240 break;
2241 ++datagrams;
Soheil Hassas Yeganeh30238982016-11-04 15:36:49 -04002242 if (msg_data_left(&msg_sys))
2243 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002244 cond_resched();
Anton Blanchard228e5482011-05-02 20:21:35 +00002245 }
2246
Anton Blanchard228e5482011-05-02 20:21:35 +00002247 fput_light(sock->file, fput_needed);
2248
Anton Blanchard728ffb82011-08-04 14:07:38 +00002249 /* We only return an error if no datagrams were able to be sent */
2250 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002251 return datagrams;
2252
Anton Blanchard228e5482011-05-02 20:21:35 +00002253 return err;
2254}
2255
2256SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2257 unsigned int, vlen, unsigned int, flags)
2258{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002259 return __sys_sendmmsg(fd, mmsg, vlen, flags, true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002260}
2261
Al Viro666547f2014-04-06 14:03:05 -04002262static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002263 struct msghdr *msg_sys, unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002265 struct compat_msghdr __user *msg_compat =
2266 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002267 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002268 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269 unsigned long cmsg_ptr;
Al Viro2da62902015-03-14 21:13:46 -04002270 int len;
Al Viro08adb7d2014-11-10 20:23:13 -05002271 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002272
2273 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002274 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002275
2276 /* user mode address pointers */
2277 struct sockaddr __user *uaddr;
Al Viro08adb7d2014-11-10 20:23:13 -05002278 int __user *uaddr_len = COMPAT_NAMELEN(msg);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002279
Al Viro08adb7d2014-11-10 20:23:13 -05002280 msg_sys->msg_name = &addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002281
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002282 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002283 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002284 else
Al Viro08adb7d2014-11-10 20:23:13 -05002285 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002286 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04002287 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002288
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002289 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2290 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002291
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002292 /* We assume all kernel code knows the size of sockaddr_storage */
2293 msg_sys->msg_namelen = 0;
2294
Linus Torvalds1da177e2005-04-16 15:20:36 -07002295 if (sock->file->f_flags & O_NONBLOCK)
2296 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002297 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002298 if (err < 0)
2299 goto out_freeiov;
2300 len = err;
2301
2302 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002303 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002304 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002305 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002306 if (err < 0)
2307 goto out_freeiov;
2308 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002309 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002310 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002311 if (err)
2312 goto out_freeiov;
2313 if (MSG_CMSG_COMPAT & flags)
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_compat->msg_controllen);
2316 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002317 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318 &msg->msg_controllen);
2319 if (err)
2320 goto out_freeiov;
2321 err = len;
2322
2323out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04002324 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002325 return err;
2326}
2327
2328/*
2329 * BSD recvmsg interface
2330 */
2331
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002332long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2333 bool forbid_cmsg_compat)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002334{
2335 int fput_needed, err;
2336 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002337 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002338
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002339 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2340 return -EINVAL;
2341
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002342 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002343 if (!sock)
2344 goto out;
2345
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002346 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002347
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002348 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002349out:
2350 return err;
2351}
2352
Al Viro666547f2014-04-06 14:03:05 -04002353SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002354 unsigned int, flags)
2355{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002356 return __sys_recvmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002357}
2358
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002359/*
2360 * Linux recvmmsg interface
2361 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002362
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002363static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2364 unsigned int vlen, unsigned int flags,
2365 struct timespec64 *timeout)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002366{
2367 int fput_needed, err, datagrams;
2368 struct socket *sock;
2369 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002370 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002371 struct msghdr msg_sys;
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002372 struct timespec64 end_time;
2373 struct timespec64 timeout64;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002374
2375 if (timeout &&
2376 poll_select_set_timeout(&end_time, timeout->tv_sec,
2377 timeout->tv_nsec))
2378 return -EINVAL;
2379
2380 datagrams = 0;
2381
2382 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2383 if (!sock)
2384 return err;
2385
Soheil Hassas Yeganeh7797dc42018-02-27 18:22:40 -05002386 if (likely(!(flags & MSG_ERRQUEUE))) {
2387 err = sock_error(sock->sk);
2388 if (err) {
2389 datagrams = err;
2390 goto out_put;
2391 }
Maxime Jayate623a9e2017-02-21 18:35:51 +01002392 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002393
2394 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002395 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002396
2397 while (datagrams < vlen) {
2398 /*
2399 * No need to ask LSM for more than the first datagram.
2400 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002401 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002402 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002403 &msg_sys, flags & ~MSG_WAITFORONE,
2404 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002405 if (err < 0)
2406 break;
2407 err = __put_user(err, &compat_entry->msg_len);
2408 ++compat_entry;
2409 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002410 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002411 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002412 &msg_sys, flags & ~MSG_WAITFORONE,
2413 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002414 if (err < 0)
2415 break;
2416 err = put_user(err, &entry->msg_len);
2417 ++entry;
2418 }
2419
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002420 if (err)
2421 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002422 ++datagrams;
2423
Brandon L Black71c5c1592010-03-26 16:18:03 +00002424 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2425 if (flags & MSG_WAITFORONE)
2426 flags |= MSG_DONTWAIT;
2427
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002428 if (timeout) {
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002429 ktime_get_ts64(&timeout64);
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002430 *timeout = timespec64_sub(end_time, timeout64);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002431 if (timeout->tv_sec < 0) {
2432 timeout->tv_sec = timeout->tv_nsec = 0;
2433 break;
2434 }
2435
2436 /* Timeout, return less than vlen datagrams */
2437 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2438 break;
2439 }
2440
2441 /* Out of band data, return right away */
2442 if (msg_sys.msg_flags & MSG_OOB)
2443 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002444 cond_resched();
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002445 }
2446
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002447 if (err == 0)
2448 goto out_put;
2449
2450 if (datagrams == 0) {
2451 datagrams = err;
2452 goto out_put;
2453 }
2454
2455 /*
2456 * We may return less entries than requested (vlen) if the
2457 * sock is non block and there aren't enough datagrams...
2458 */
2459 if (err != -EAGAIN) {
2460 /*
2461 * ... or if recvmsg returns an error after we
2462 * received some datagrams, where we record the
2463 * error to return on the next call or if the
2464 * app asks about it using getsockopt(SO_ERROR).
2465 */
2466 sock->sk->sk_err = -err;
2467 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002468out_put:
2469 fput_light(sock->file, fput_needed);
2470
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002471 return datagrams;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002472}
2473
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002474int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2475 unsigned int vlen, unsigned int flags,
2476 struct __kernel_timespec __user *timeout,
2477 struct old_timespec32 __user *timeout32)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002478{
2479 int datagrams;
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002480 struct timespec64 timeout_sys;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002481
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002482 if (timeout && get_timespec64(&timeout_sys, timeout))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002483 return -EFAULT;
2484
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002485 if (timeout32 && get_old_timespec32(&timeout_sys, timeout32))
2486 return -EFAULT;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002487
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002488 if (!timeout && !timeout32)
2489 return do_recvmmsg(fd, mmsg, vlen, flags, NULL);
2490
2491 datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2492
2493 if (datagrams <= 0)
2494 return datagrams;
2495
2496 if (timeout && put_timespec64(&timeout_sys, timeout))
2497 datagrams = -EFAULT;
2498
2499 if (timeout32 && put_old_timespec32(&timeout_sys, timeout32))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002500 datagrams = -EFAULT;
2501
2502 return datagrams;
2503}
2504
Dominik Brodowski1255e262018-03-13 20:44:21 +01002505SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2506 unsigned int, vlen, unsigned int, flags,
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002507 struct __kernel_timespec __user *, timeout)
Dominik Brodowski1255e262018-03-13 20:44:21 +01002508{
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002509 if (flags & MSG_CMSG_COMPAT)
2510 return -EINVAL;
2511
2512 return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL);
Dominik Brodowski1255e262018-03-13 20:44:21 +01002513}
2514
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002515#ifdef CONFIG_COMPAT_32BIT_TIME
2516SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg,
2517 unsigned int, vlen, unsigned int, flags,
2518 struct old_timespec32 __user *, timeout)
2519{
2520 if (flags & MSG_CMSG_COMPAT)
2521 return -EINVAL;
2522
2523 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout);
2524}
2525#endif
2526
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002527#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002528/* Argument list sizes for sys_socketcall */
2529#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002530static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002531 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2532 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2533 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002534 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002535};
2536
Linus Torvalds1da177e2005-04-16 15:20:36 -07002537#undef AL
2538
2539/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002540 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002541 *
2542 * Argument checking cleaned up. Saved 20% in size.
2543 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002544 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002545 */
2546
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002547SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002548{
Chen Gang2950fa92013-04-07 16:55:23 +08002549 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002550 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002551 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002552 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002553
Anton Blanchard228e5482011-05-02 20:21:35 +00002554 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002555 return -EINVAL;
Jeremy Clinec8e8cd52018-07-27 22:43:01 +00002556 call = array_index_nospec(call, SYS_SENDMMSG + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002557
Arjan van de Ven47379052009-09-28 12:57:44 -07002558 len = nargs[call];
2559 if (len > sizeof(a))
2560 return -EINVAL;
2561
Linus Torvalds1da177e2005-04-16 15:20:36 -07002562 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002563 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002564 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002565
Chen Gang2950fa92013-04-07 16:55:23 +08002566 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2567 if (err)
2568 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002569
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002570 a0 = a[0];
2571 a1 = a[1];
2572
2573 switch (call) {
2574 case SYS_SOCKET:
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01002575 err = __sys_socket(a0, a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002576 break;
2577 case SYS_BIND:
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01002578 err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002579 break;
2580 case SYS_CONNECT:
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01002581 err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002582 break;
2583 case SYS_LISTEN:
Dominik Brodowski25e290e2018-03-13 19:36:54 +01002584 err = __sys_listen(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002585 break;
2586 case SYS_ACCEPT:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002587 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2588 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002589 break;
2590 case SYS_GETSOCKNAME:
2591 err =
Dominik Brodowski8882a102018-03-13 19:43:14 +01002592 __sys_getsockname(a0, (struct sockaddr __user *)a1,
2593 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002594 break;
2595 case SYS_GETPEERNAME:
2596 err =
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01002597 __sys_getpeername(a0, (struct sockaddr __user *)a1,
2598 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002599 break;
2600 case SYS_SOCKETPAIR:
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01002601 err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002602 break;
2603 case SYS_SEND:
Dominik Brodowskif3bf8962018-03-13 19:52:00 +01002604 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2605 NULL, 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002606 break;
2607 case SYS_SENDTO:
Dominik Brodowski211b6342018-03-13 19:18:52 +01002608 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2609 (struct sockaddr __user *)a[4], a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002610 break;
2611 case SYS_RECV:
Dominik Brodowskid27e9af2018-03-13 19:54:17 +01002612 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2613 NULL, NULL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002614 break;
2615 case SYS_RECVFROM:
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002616 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2617 (struct sockaddr __user *)a[4],
2618 (int __user *)a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002619 break;
2620 case SYS_SHUTDOWN:
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002621 err = __sys_shutdown(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002622 break;
2623 case SYS_SETSOCKOPT:
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002624 err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3],
2625 a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002626 break;
2627 case SYS_GETSOCKOPT:
2628 err =
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002629 __sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2630 (int __user *)a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002631 break;
2632 case SYS_SENDMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002633 err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1,
2634 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002635 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002636 case SYS_SENDMMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002637 err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2],
2638 a[3], true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002639 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002640 case SYS_RECVMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002641 err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1,
2642 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002643 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002644 case SYS_RECVMMSG:
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002645 if (IS_ENABLED(CONFIG_64BIT) || !IS_ENABLED(CONFIG_64BIT_TIME))
2646 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
2647 a[2], a[3],
2648 (struct __kernel_timespec __user *)a[4],
2649 NULL);
2650 else
2651 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
2652 a[2], a[3], NULL,
2653 (struct old_timespec32 __user *)a[4]);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002654 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002655 case SYS_ACCEPT4:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002656 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2657 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002658 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002659 default:
2660 err = -EINVAL;
2661 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662 }
2663 return err;
2664}
2665
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002666#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002667
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002668/**
2669 * sock_register - add a socket protocol handler
2670 * @ops: description of protocol
2671 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002672 * This function is called by a protocol handler that wants to
2673 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09002674 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002675 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002676 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002677int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002678{
2679 int err;
2680
2681 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08002682 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683 return -ENOBUFS;
2684 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002685
2686 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002687 if (rcu_dereference_protected(net_families[ops->family],
2688 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002689 err = -EEXIST;
2690 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00002691 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002692 err = 0;
2693 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002694 spin_unlock(&net_family_lock);
2695
Yang Yingliang3410f222014-02-12 17:09:55 +08002696 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002697 return err;
2698}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002699EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002700
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002701/**
2702 * sock_unregister - remove a protocol handler
2703 * @family: protocol family to remove
2704 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002705 * This function is called by a protocol handler that wants to
2706 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002707 * new socket creation.
2708 *
2709 * If protocol handler is a module, then it can use module reference
2710 * counts to protect against new references. If protocol handler is not
2711 * a module then it needs to provide its own protection in
2712 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002713 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002714void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002715{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002716 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002717
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002718 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00002719 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002720 spin_unlock(&net_family_lock);
2721
2722 synchronize_rcu();
2723
Yang Yingliang3410f222014-02-12 17:09:55 +08002724 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002725}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002726EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002727
Xin Longbf2ae2e2018-03-10 18:57:50 +08002728bool sock_is_registered(int family)
2729{
Jeremy Cline66b51b02018-08-13 22:23:13 +00002730 return family < NPROTO && rcu_access_pointer(net_families[family]);
Xin Longbf2ae2e2018-03-10 18:57:50 +08002731}
2732
Andi Kleen77d76ea2005-12-22 12:43:42 -08002733static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002734{
Nick Pigginb3e19d92011-01-07 17:50:11 +11002735 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00002736 /*
2737 * Initialize the network sysctl infrastructure.
2738 */
2739 err = net_sysctl_init();
2740 if (err)
2741 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11002742
Linus Torvalds1da177e2005-04-16 15:20:36 -07002743 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002744 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002745 */
2746 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002747
2748 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002749 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002750 */
2751
2752 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11002753
2754 err = register_filesystem(&sock_fs_type);
2755 if (err)
2756 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002757 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11002758 if (IS_ERR(sock_mnt)) {
2759 err = PTR_ERR(sock_mnt);
2760 goto out_mount;
2761 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08002762
2763 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002764 */
2765
2766#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00002767 err = netfilter_init();
2768 if (err)
2769 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002770#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002771
Daniel Borkmann408eccc2014-04-01 16:20:23 +02002772 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00002773
Nick Pigginb3e19d92011-01-07 17:50:11 +11002774out:
2775 return err;
2776
2777out_mount:
2778 unregister_filesystem(&sock_fs_type);
2779out_fs:
2780 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002781}
2782
Andi Kleen77d76ea2005-12-22 12:43:42 -08002783core_initcall(sock_init); /* early initcall */
2784
Linus Torvalds1da177e2005-04-16 15:20:36 -07002785#ifdef CONFIG_PROC_FS
2786void socket_seq_show(struct seq_file *seq)
2787{
Tonghao Zhang648845a2017-12-14 05:51:58 -08002788 seq_printf(seq, "sockets: used %d\n",
2789 sock_inuse_get(seq->private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002790}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002791#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002792
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002793#ifdef CONFIG_COMPAT
Arnd Bergmann6b960182009-11-06 23:10:54 -08002794static int do_siocgstamp(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002795 unsigned int cmd, void __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002796{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002797 mm_segment_t old_fs = get_fs();
2798 struct timeval ktv;
2799 int err;
2800
2801 set_fs(KERNEL_DS);
Johannes Berg1cebf8f2018-09-13 14:40:55 +02002802 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv,
2803 sizeof(struct compat_ifreq));
Arnd Bergmann7a229382009-11-06 23:00:29 -08002804 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002805 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002806 err = compat_put_timeval(&ktv, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002807
Arnd Bergmann7a229382009-11-06 23:00:29 -08002808 return err;
2809}
2810
Arnd Bergmann6b960182009-11-06 23:10:54 -08002811static int do_siocgstampns(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002812 unsigned int cmd, void __user *up)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002813{
Arnd Bergmann7a229382009-11-06 23:00:29 -08002814 mm_segment_t old_fs = get_fs();
2815 struct timespec kts;
2816 int err;
2817
2818 set_fs(KERNEL_DS);
Johannes Berg1cebf8f2018-09-13 14:40:55 +02002819 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts,
2820 sizeof(struct compat_ifreq));
Arnd Bergmann7a229382009-11-06 23:00:29 -08002821 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002822 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002823 err = compat_put_timespec(&kts, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002824
Arnd Bergmann7a229382009-11-06 23:00:29 -08002825 return err;
2826}
2827
Al Viro36fd6332017-06-26 13:19:16 -04002828static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002829{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002830 struct compat_ifconf ifc32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002831 struct ifconf ifc;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002832 int err;
2833
Arnd Bergmann6b960182009-11-06 23:10:54 -08002834 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002835 return -EFAULT;
2836
Al Viro36fd6332017-06-26 13:19:16 -04002837 ifc.ifc_len = ifc32.ifc_len;
2838 ifc.ifc_req = compat_ptr(ifc32.ifcbuf);
Arnd Bergmann7a229382009-11-06 23:00:29 -08002839
Al Viro36fd6332017-06-26 13:19:16 -04002840 rtnl_lock();
2841 err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq));
2842 rtnl_unlock();
Arnd Bergmann7a229382009-11-06 23:00:29 -08002843 if (err)
2844 return err;
2845
Al Viro36fd6332017-06-26 13:19:16 -04002846 ifc32.ifc_len = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002847 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002848 return -EFAULT;
2849
2850 return 0;
2851}
2852
Arnd Bergmann6b960182009-11-06 23:10:54 -08002853static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08002854{
Ben Hutchings3a7da392011-03-17 07:34:32 +00002855 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2856 bool convert_in = false, convert_out = false;
Al Viro44c02a22017-10-05 12:59:44 -04002857 size_t buf_size = 0;
2858 struct ethtool_rxnfc __user *rxnfc = NULL;
2859 struct ifreq ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002860 u32 rule_cnt = 0, actual_rule_cnt;
2861 u32 ethcmd;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002862 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002863 int ret;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002864
2865 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2866 return -EFAULT;
2867
Ben Hutchings3a7da392011-03-17 07:34:32 +00002868 compat_rxnfc = compat_ptr(data);
2869
2870 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a229382009-11-06 23:00:29 -08002871 return -EFAULT;
2872
Ben Hutchings3a7da392011-03-17 07:34:32 +00002873 /* Most ethtool structures are defined without padding.
2874 * Unfortunately struct ethtool_rxnfc is an exception.
2875 */
2876 switch (ethcmd) {
2877 default:
2878 break;
2879 case ETHTOOL_GRXCLSRLALL:
2880 /* Buffer size is variable */
2881 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2882 return -EFAULT;
2883 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2884 return -ENOMEM;
2885 buf_size += rule_cnt * sizeof(u32);
2886 /* fall through */
2887 case ETHTOOL_GRXRINGS:
2888 case ETHTOOL_GRXCLSRLCNT:
2889 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00002890 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002891 convert_out = true;
2892 /* fall through */
2893 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002894 buf_size += sizeof(struct ethtool_rxnfc);
2895 convert_in = true;
Al Viro44c02a22017-10-05 12:59:44 -04002896 rxnfc = compat_alloc_user_space(buf_size);
Ben Hutchings3a7da392011-03-17 07:34:32 +00002897 break;
2898 }
2899
Al Viro44c02a22017-10-05 12:59:44 -04002900 if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ))
Ben Hutchings3a7da392011-03-17 07:34:32 +00002901 return -EFAULT;
2902
Al Viro44c02a22017-10-05 12:59:44 -04002903 ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002904
2905 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00002906 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00002907 * fs.ring_cookie and at the end of fs, but nowhere else.
2908 */
Alexander Duyck127fe532011-04-08 18:01:59 +00002909 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2910 sizeof(compat_rxnfc->fs.m_ext) !=
2911 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2912 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00002913 BUILD_BUG_ON(
2914 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2915 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2916 offsetof(struct ethtool_rxnfc, fs.location) -
2917 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2918
2919 if (copy_in_user(rxnfc, compat_rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002920 (void __user *)(&rxnfc->fs.m_ext + 1) -
2921 (void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002922 copy_in_user(&rxnfc->fs.ring_cookie,
2923 &compat_rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002924 (void __user *)(&rxnfc->fs.location + 1) -
Wenwen Wangb6168562018-10-18 09:36:46 -05002925 (void __user *)&rxnfc->fs.ring_cookie))
2926 return -EFAULT;
2927 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2928 if (put_user(rule_cnt, &rxnfc->rule_cnt))
2929 return -EFAULT;
2930 } else if (copy_in_user(&rxnfc->rule_cnt,
2931 &compat_rxnfc->rule_cnt,
2932 sizeof(rxnfc->rule_cnt)))
Ben Hutchings3a7da392011-03-17 07:34:32 +00002933 return -EFAULT;
2934 }
2935
Al Viro44c02a22017-10-05 12:59:44 -04002936 ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL);
Ben Hutchings3a7da392011-03-17 07:34:32 +00002937 if (ret)
2938 return ret;
2939
2940 if (convert_out) {
2941 if (copy_in_user(compat_rxnfc, rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002942 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2943 (const void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002944 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2945 &rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002946 (const void __user *)(&rxnfc->fs.location + 1) -
2947 (const void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002948 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2949 sizeof(rxnfc->rule_cnt)))
2950 return -EFAULT;
2951
2952 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2953 /* As an optimisation, we only copy the actual
2954 * number of rules that the underlying
2955 * function returned. Since Mallory might
2956 * change the rule count in user memory, we
2957 * check that it is less than the rule count
2958 * originally given (as the user buffer size),
2959 * which has been range-checked.
2960 */
2961 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2962 return -EFAULT;
2963 if (actual_rule_cnt < rule_cnt)
2964 rule_cnt = actual_rule_cnt;
2965 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2966 &rxnfc->rule_locs[0],
2967 rule_cnt * sizeof(u32)))
2968 return -EFAULT;
2969 }
2970 }
2971
2972 return 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002973}
2974
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002975static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2976{
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002977 compat_uptr_t uptr32;
Al Viro44c02a22017-10-05 12:59:44 -04002978 struct ifreq ifr;
2979 void __user *saved;
2980 int err;
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002981
Al Viro44c02a22017-10-05 12:59:44 -04002982 if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002983 return -EFAULT;
2984
2985 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2986 return -EFAULT;
2987
Al Viro44c02a22017-10-05 12:59:44 -04002988 saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc;
2989 ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002990
Al Viro44c02a22017-10-05 12:59:44 -04002991 err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL);
2992 if (!err) {
2993 ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved;
2994 if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq)))
2995 err = -EFAULT;
Joe Perchesccbd6a52010-05-14 10:58:26 +00002996 }
Al Viro44c02a22017-10-05 12:59:44 -04002997 return err;
Arnd Bergmann7a229382009-11-06 23:00:29 -08002998}
2999
Ben Hutchings590d4692013-11-18 17:04:13 +00003000/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3001static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08003002 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003003{
Al Viro44c02a22017-10-05 12:59:44 -04003004 struct ifreq ifreq;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003005 u32 data32;
3006
Al Viro44c02a22017-10-05 12:59:44 -04003007 if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003008 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04003009 if (get_user(data32, &u_ifreq32->ifr_data))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003010 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04003011 ifreq.ifr_data = compat_ptr(data32);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003012
Al Viro44c02a22017-10-05 12:59:44 -04003013 return dev_ioctl(net, cmd, &ifreq, NULL);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003014}
3015
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003016static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
3017 struct compat_ifreq __user *uifr32)
3018{
3019 struct ifreq ifr;
3020 struct compat_ifmap __user *uifmap32;
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003021 int err;
3022
3023 uifmap32 = &uifr32->ifr_ifru.ifru_map;
3024 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003025 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3026 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3027 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3028 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
3029 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
3030 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003031 if (err)
3032 return -EFAULT;
3033
Al Viro44c02a22017-10-05 12:59:44 -04003034 err = dev_ioctl(net, cmd, &ifr, NULL);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003035
3036 if (cmd == SIOCGIFMAP && !err) {
3037 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003038 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3039 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3040 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3041 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
3042 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
3043 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003044 if (err)
3045 err = -EFAULT;
3046 }
3047 return err;
3048}
3049
Arnd Bergmann7a229382009-11-06 23:00:29 -08003050struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003051 u32 rt_pad1;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003052 struct sockaddr rt_dst; /* target address */
3053 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3054 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003055 unsigned short rt_flags;
3056 short rt_pad2;
3057 u32 rt_pad3;
3058 unsigned char rt_tos;
3059 unsigned char rt_class;
3060 short rt_pad4;
3061 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003062 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003063 u32 rt_mtu; /* per route MTU/Window */
3064 u32 rt_window; /* Window clamping */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003065 unsigned short rt_irtt; /* Initial RTT */
3066};
3067
3068struct in6_rtmsg32 {
3069 struct in6_addr rtmsg_dst;
3070 struct in6_addr rtmsg_src;
3071 struct in6_addr rtmsg_gateway;
3072 u32 rtmsg_type;
3073 u16 rtmsg_dst_len;
3074 u16 rtmsg_src_len;
3075 u32 rtmsg_metric;
3076 u32 rtmsg_info;
3077 u32 rtmsg_flags;
3078 s32 rtmsg_ifindex;
3079};
3080
Arnd Bergmann6b960182009-11-06 23:10:54 -08003081static int routing_ioctl(struct net *net, struct socket *sock,
3082 unsigned int cmd, void __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003083{
3084 int ret;
3085 void *r = NULL;
3086 struct in6_rtmsg r6;
3087 struct rtentry r4;
3088 char devname[16];
3089 u32 rtdev;
3090 mm_segment_t old_fs = get_fs();
3091
Arnd Bergmann6b960182009-11-06 23:10:54 -08003092 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3093 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003094 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003095 3 * sizeof(struct in6_addr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003096 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3097 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3098 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3099 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3100 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3101 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3102 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003103
3104 r = (void *) &r6;
3105 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003106 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003107 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003108 3 * sizeof(struct sockaddr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003109 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3110 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3111 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3112 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3113 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3114 ret |= get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003115 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003116 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003117 r4.rt_dev = (char __user __force *)devname;
3118 devname[15] = 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003119 } else
3120 r4.rt_dev = NULL;
3121
3122 r = (void *) &r4;
3123 }
3124
3125 if (ret) {
3126 ret = -EFAULT;
3127 goto out;
3128 }
3129
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003130 set_fs(KERNEL_DS);
Johannes Berg1cebf8f2018-09-13 14:40:55 +02003131 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r,
3132 sizeof(struct compat_ifreq));
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003133 set_fs(old_fs);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003134
3135out:
Arnd Bergmann7a229382009-11-06 23:00:29 -08003136 return ret;
3137}
3138
3139/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3140 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003141 * use compatible ioctls
Arnd Bergmann7a229382009-11-06 23:00:29 -08003142 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003143static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003144{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003145 compat_ulong_t tmp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003146
Arnd Bergmann6b960182009-11-06 23:10:54 -08003147 if (get_user(tmp, argp))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003148 return -EFAULT;
3149 if (tmp == BRCTL_GET_VERSION)
3150 return BRCTL_VERSION + 1;
3151 return -EINVAL;
3152}
3153
Arnd Bergmann6b960182009-11-06 23:10:54 -08003154static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3155 unsigned int cmd, unsigned long arg)
3156{
3157 void __user *argp = compat_ptr(arg);
3158 struct sock *sk = sock->sk;
3159 struct net *net = sock_net(sk);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003160
Arnd Bergmann6b960182009-11-06 23:10:54 -08003161 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003162 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003163
Arnd Bergmann6b960182009-11-06 23:10:54 -08003164 switch (cmd) {
3165 case SIOCSIFBR:
3166 case SIOCGIFBR:
3167 return old_bridge_ioctl(argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003168 case SIOCGIFCONF:
Al Viro36fd6332017-06-26 13:19:16 -04003169 return compat_dev_ifconf(net, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003170 case SIOCETHTOOL:
3171 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003172 case SIOCWANDEV:
3173 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003174 case SIOCGIFMAP:
3175 case SIOCSIFMAP:
3176 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003177 case SIOCADDRT:
3178 case SIOCDELRT:
3179 return routing_ioctl(net, sock, cmd, argp);
3180 case SIOCGSTAMP:
3181 return do_siocgstamp(net, sock, cmd, argp);
3182 case SIOCGSTAMPNS:
3183 return do_siocgstampns(net, sock, cmd, argp);
Ben Hutchings590d4692013-11-18 17:04:13 +00003184 case SIOCBONDSLAVEINFOQUERY:
3185 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003186 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003187 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003188 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003189
Arnd Bergmann6b960182009-11-06 23:10:54 -08003190 case FIOSETOWN:
3191 case SIOCSPGRP:
3192 case FIOGETOWN:
3193 case SIOCGPGRP:
3194 case SIOCBRADDBR:
3195 case SIOCBRDELBR:
3196 case SIOCGIFVLAN:
3197 case SIOCSIFVLAN:
3198 case SIOCADDDLCI:
3199 case SIOCDELDLCI:
Andrey Vaginc62cce22016-10-24 18:29:13 -07003200 case SIOCGSKNS:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003201 return sock_ioctl(file, cmd, arg);
3202
3203 case SIOCGIFFLAGS:
3204 case SIOCSIFFLAGS:
3205 case SIOCGIFMETRIC:
3206 case SIOCSIFMETRIC:
3207 case SIOCGIFMTU:
3208 case SIOCSIFMTU:
3209 case SIOCGIFMEM:
3210 case SIOCSIFMEM:
3211 case SIOCGIFHWADDR:
3212 case SIOCSIFHWADDR:
3213 case SIOCADDMULTI:
3214 case SIOCDELMULTI:
3215 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003216 case SIOCGIFADDR:
3217 case SIOCSIFADDR:
3218 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003219 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003220 case SIOCGIFBRDADDR:
3221 case SIOCSIFBRDADDR:
3222 case SIOCGIFDSTADDR:
3223 case SIOCSIFDSTADDR:
3224 case SIOCGIFNETMASK:
3225 case SIOCSIFNETMASK:
3226 case SIOCSIFPFLAGS:
3227 case SIOCGIFPFLAGS:
3228 case SIOCGIFTXQLEN:
3229 case SIOCSIFTXQLEN:
3230 case SIOCBRADDIF:
3231 case SIOCBRDELIF:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003232 case SIOCSIFNAME:
3233 case SIOCGMIIPHY:
3234 case SIOCGMIIREG:
3235 case SIOCSMIIREG:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003236 case SIOCSARP:
3237 case SIOCGARP:
3238 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003239 case SIOCATMARK:
Al Virof92d4fc2017-09-30 19:32:17 -04003240 case SIOCBONDENSLAVE:
3241 case SIOCBONDRELEASE:
3242 case SIOCBONDSETHWADDR:
3243 case SIOCBONDCHANGEACTIVE:
Al Viro4cf808e72017-10-01 21:12:09 -04003244 case SIOCGIFNAME:
Johannes Berg1cebf8f2018-09-13 14:40:55 +02003245 return sock_do_ioctl(net, sock, cmd, arg,
3246 sizeof(struct compat_ifreq));
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003247 }
3248
Arnd Bergmann6b960182009-11-06 23:10:54 -08003249 return -ENOIOCTLCMD;
3250}
Arnd Bergmann7a229382009-11-06 23:00:29 -08003251
Eric Dumazet95c96172012-04-15 05:58:06 +00003252static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003253 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003254{
3255 struct socket *sock = file->private_data;
3256 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003257 struct sock *sk;
3258 struct net *net;
3259
3260 sk = sock->sk;
3261 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003262
3263 if (sock->ops->compat_ioctl)
3264 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3265
David S. Miller87de87d2008-06-03 09:14:03 -07003266 if (ret == -ENOIOCTLCMD &&
3267 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3268 ret = compat_wext_handle_ioctl(net, cmd, arg);
3269
Arnd Bergmann6b960182009-11-06 23:10:54 -08003270 if (ret == -ENOIOCTLCMD)
3271 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3272
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003273 return ret;
3274}
3275#endif
3276
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003277int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3278{
3279 return sock->ops->bind(sock, addr, addrlen);
3280}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003281EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003282
3283int kernel_listen(struct socket *sock, int backlog)
3284{
3285 return sock->ops->listen(sock, backlog);
3286}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003287EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003288
3289int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3290{
3291 struct sock *sk = sock->sk;
3292 int err;
3293
3294 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3295 newsock);
3296 if (err < 0)
3297 goto done;
3298
David Howellscdfbabf2017-03-09 08:09:05 +00003299 err = sock->ops->accept(sock, *newsock, flags, true);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003300 if (err < 0) {
3301 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003302 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003303 goto done;
3304 }
3305
3306 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003307 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003308
3309done:
3310 return err;
3311}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003312EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003313
3314int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003315 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003316{
3317 return sock->ops->connect(sock, addr, addrlen, flags);
3318}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003319EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003320
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003321int kernel_getsockname(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003322{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003323 return sock->ops->getname(sock, addr, 0);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003324}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003325EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003326
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003327int kernel_getpeername(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003328{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003329 return sock->ops->getname(sock, addr, 1);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003330}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003331EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003332
3333int kernel_getsockopt(struct socket *sock, int level, int optname,
3334 char *optval, int *optlen)
3335{
3336 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003337 char __user *uoptval;
3338 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003339 int err;
3340
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003341 uoptval = (char __user __force *) optval;
3342 uoptlen = (int __user __force *) optlen;
3343
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003344 set_fs(KERNEL_DS);
3345 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003346 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003347 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003348 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3349 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003350 set_fs(oldfs);
3351 return err;
3352}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003353EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003354
3355int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003356 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003357{
3358 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003359 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003360 int err;
3361
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003362 uoptval = (char __user __force *) optval;
3363
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003364 set_fs(KERNEL_DS);
3365 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003366 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003367 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003368 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003369 optlen);
3370 set_fs(oldfs);
3371 return err;
3372}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003373EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003374
3375int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3376 size_t size, int flags)
3377{
3378 if (sock->ops->sendpage)
3379 return sock->ops->sendpage(sock, page, offset, size, flags);
3380
3381 return sock_no_sendpage(sock, page, offset, size, flags);
3382}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003383EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003384
Tom Herbert306b13e2017-07-28 16:22:41 -07003385int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
3386 size_t size, int flags)
3387{
3388 struct socket *sock = sk->sk_socket;
3389
3390 if (sock->ops->sendpage_locked)
3391 return sock->ops->sendpage_locked(sk, page, offset, size,
3392 flags);
3393
3394 return sock_no_sendpage_locked(sk, page, offset, size, flags);
3395}
3396EXPORT_SYMBOL(kernel_sendpage_locked);
3397
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003398int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3399{
3400 return sock->ops->shutdown(sock, how);
3401}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003402EXPORT_SYMBOL(kernel_sock_shutdown);
R. Parameswaran113c3072017-04-05 16:50:35 -07003403
3404/* This routine returns the IP overhead imposed by a socket i.e.
3405 * the length of the underlying IP header, depending on whether
3406 * this is an IPv4 or IPv6 socket and the length from IP options turned
R. Parameswaran57240d02017-04-12 18:31:04 -07003407 * on at the socket. Assumes that the caller has a lock on the socket.
R. Parameswaran113c3072017-04-05 16:50:35 -07003408 */
3409u32 kernel_sock_ip_overhead(struct sock *sk)
3410{
3411 struct inet_sock *inet;
3412 struct ip_options_rcu *opt;
3413 u32 overhead = 0;
R. Parameswaran113c3072017-04-05 16:50:35 -07003414#if IS_ENABLED(CONFIG_IPV6)
3415 struct ipv6_pinfo *np;
3416 struct ipv6_txoptions *optv6 = NULL;
3417#endif /* IS_ENABLED(CONFIG_IPV6) */
3418
3419 if (!sk)
3420 return overhead;
3421
R. Parameswaran113c3072017-04-05 16:50:35 -07003422 switch (sk->sk_family) {
3423 case AF_INET:
3424 inet = inet_sk(sk);
3425 overhead += sizeof(struct iphdr);
3426 opt = rcu_dereference_protected(inet->inet_opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003427 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003428 if (opt)
3429 overhead += opt->opt.optlen;
3430 return overhead;
3431#if IS_ENABLED(CONFIG_IPV6)
3432 case AF_INET6:
3433 np = inet6_sk(sk);
3434 overhead += sizeof(struct ipv6hdr);
3435 if (np)
3436 optv6 = rcu_dereference_protected(np->opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003437 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003438 if (optv6)
3439 overhead += (optv6->opt_flen + optv6->opt_nflen);
3440 return overhead;
3441#endif /* IS_ENABLED(CONFIG_IPV6) */
3442 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
3443 return overhead;
3444 }
3445}
3446EXPORT_SYMBOL(kernel_sock_ip_overhead);