blob: bd3b33988ee015d5bfed69813d04b41f61120417 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NET An implementation of the SOCKET network access protocol.
3 *
4 * Version: @(#)socket.c 1.1.93 18/02/95
5 *
6 * Authors: Orest Zborowski, <obz@Kodak.COM>
Jesper Juhl02c30a82005-05-05 16:16:16 -07007 * Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
9 *
10 * Fixes:
11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
12 * shutdown()
13 * Alan Cox : verify_area() fixes
14 * Alan Cox : Removed DDI
15 * Jonathan Kamens : SOCK_DGRAM reconnect bug
16 * Alan Cox : Moved a load of checks to the very
17 * top level.
18 * Alan Cox : Move address structures to/from user
19 * mode above the protocol layers.
20 * Rob Janssen : Allow 0 length sends.
21 * Alan Cox : Asynchronous I/O support (cribbed from the
22 * tty drivers).
23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
24 * Jeff Uphoff : Made max number of sockets command-line
25 * configurable.
26 * Matti Aarnio : Made the number of sockets dynamic,
27 * to be allocated when needed, and mr.
28 * Uphoff's max is used as max to be
29 * allowed to allocate.
30 * Linus : Argh. removed all the socket allocation
31 * altogether: it's in the inode now.
32 * Alan Cox : Made sock_alloc()/sock_release() public
33 * for NetROM and future kernel nfsd type
34 * stuff.
35 * Alan Cox : sendmsg/recvmsg basics.
36 * Tom Dyas : Export net symbols.
37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
38 * Alan Cox : Added thread locking to sys_* calls
39 * for sockets. May have errors at the
40 * moment.
41 * Kevin Buhr : Fixed the dumb errors in the above.
42 * Andi Kleen : Some small cleanups, optimizations,
43 * and fixed a copy_from_user() bug.
44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
Stephen Hemminger89bddce2006-09-01 00:19:31 -070045 * Tigran Aivazian : Made listen(2) backlog sanity checks
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 * protocol-independent
47 *
48 *
49 * This program is free software; you can redistribute it and/or
50 * modify it under the terms of the GNU General Public License
51 * as published by the Free Software Foundation; either version
52 * 2 of the License, or (at your option) any later version.
53 *
54 *
55 * This module is effectively the top level interface to the BSD socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -070056 * paradigm.
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 *
58 * Based upon Swansea University Computer Society NET3.039
59 */
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/socket.h>
63#include <linux/file.h>
64#include <linux/net.h>
65#include <linux/interrupt.h>
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -070066#include <linux/thread_info.h>
Stephen Hemminger55737fd2006-09-01 00:23:39 -070067#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <linux/netdevice.h>
69#include <linux/proc_fs.h>
70#include <linux/seq_file.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080071#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#include <linux/if_bridge.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030073#include <linux/if_frad.h>
74#include <linux/if_vlan.h>
Daniel Borkmann408eccc2014-04-01 16:20:23 +020075#include <linux/ptp_classify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#include <linux/init.h>
77#include <linux/poll.h>
78#include <linux/cache.h>
79#include <linux/module.h>
80#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#include <linux/mount.h>
82#include <linux/security.h>
83#include <linux/syscalls.h>
84#include <linux/compat.h>
85#include <linux/kmod.h>
David Woodhouse3ec3b2f2005-05-17 12:08:48 +010086#include <linux/audit.h>
Adrian Bunkd86b5e02006-01-21 00:46:55 +010087#include <linux/wireless.h>
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -070088#include <linux/nsproxy.h>
Nick Black1fd7317d2009-09-22 16:43:33 -070089#include <linux/magic.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090090#include <linux/slab.h>
Masatake YAMATO600e1772012-08-29 10:44:29 +000091#include <linux/xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93#include <asm/uaccess.h>
94#include <asm/unistd.h>
95
96#include <net/compat.h>
David S. Miller87de87d2008-06-03 09:14:03 -070097#include <net/wext.h>
Herbert Xuf8451722010-05-24 00:12:34 -070098#include <net/cls_cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100#include <net/sock.h>
101#include <linux/netfilter.h>
102
Arnd Bergmann6b960182009-11-06 23:10:54 -0800103#include <linux/if_tun.h>
104#include <linux/ipv6_route.h>
105#include <linux/route.h>
Arnd Bergmann6b960182009-11-06 23:10:54 -0800106#include <linux/sockios.h>
107#include <linux/atalk.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +0300108#include <net/busy_poll.h>
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400109#include <linux/errqueue.h>
Eliezer Tamir06021292013-06-10 11:39:50 +0300110
Cong Wange0d10952013-08-01 11:10:25 +0800111#ifdef CONFIG_NET_RX_BUSY_POLL
Eliezer Tamir64b0dc52013-07-10 17:13:36 +0300112unsigned int sysctl_net_busy_read __read_mostly;
113unsigned int sysctl_net_busy_poll __read_mostly;
Eliezer Tamir06021292013-06-10 11:39:50 +0300114#endif
Arnd Bergmann6b960182009-11-06 23:10:54 -0800115
Al Viro8ae5e032014-11-28 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);
121static unsigned int 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 Viro8ae5e032014-11-28 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/*
166 * Statistics counters of the socket lists
167 */
168
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700169static DEFINE_PER_CPU(int, sockets_in_use);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700172 * Support routines.
173 * Move socket addresses back and forth across the kernel/user
174 * divide and look after the messy bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 */
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177/**
178 * move_addr_to_kernel - copy a socket address into kernel space
179 * @uaddr: Address in user space
180 * @kaddr: Address in kernel space
181 * @ulen: Length in user space
182 *
183 * The address is copied into kernel space. If the provided address is
184 * too long an error code of -EINVAL is returned. If the copy gives
185 * invalid addresses -EFAULT is returned. On a success 0 is returned.
186 */
187
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000188int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189{
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700190 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700192 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700194 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100196 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197}
198
199/**
200 * move_addr_to_user - copy an address to user space
201 * @kaddr: kernel space address
202 * @klen: length of address in kernel
203 * @uaddr: user space address
204 * @ulen: pointer to user length field
205 *
206 * The value pointed to by ulen on entry is the buffer length available.
207 * This is overwritten with the buffer space used. -EINVAL is returned
208 * if an overlong buffer is specified or a negative buffer size. -EFAULT
209 * is returned if either the buffer or the length field are not
210 * accessible.
211 * After copying the data up to the limit the user specifies, the true
212 * length of the data is written over the length limit the user
213 * specified. Zero is returned for a success.
214 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700215
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000216static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
stephen hemminger11165f12010-10-18 14:27:29 +0000217 void __user *uaddr, int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218{
219 int err;
220 int len;
221
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100222 BUG_ON(klen > sizeof(struct sockaddr_storage));
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700223 err = get_user(len, ulen);
224 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700226 if (len > klen)
227 len = klen;
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100228 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700230 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500231 if (audit_sockaddr(klen, kaddr))
232 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700233 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 return -EFAULT;
235 }
236 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700237 * "fromlen shall refer to the value before truncation.."
238 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 */
240 return __put_user(klen, ulen);
241}
242
Christoph Lametere18b8902006-12-06 20:33:20 -0800243static struct kmem_cache *sock_inode_cachep __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245static struct inode *sock_alloc_inode(struct super_block *sb)
246{
247 struct socket_alloc *ei;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000248 struct socket_wq *wq;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700249
Christoph Lametere94b1762006-12-06 20:33:17 -0800250 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 if (!ei)
252 return NULL;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000253 wq = kmalloc(sizeof(*wq), GFP_KERNEL);
254 if (!wq) {
Eric Dumazet43815482010-04-29 11:01:49 +0000255 kmem_cache_free(sock_inode_cachep, ei);
256 return NULL;
257 }
Eric Dumazeteaefd112011-02-18 03:26:36 +0000258 init_waitqueue_head(&wq->wait);
259 wq->fasync_list = NULL;
Nicolai Stange574aab12015-12-29 13:29:55 +0100260 wq->flags = 0;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000261 RCU_INIT_POINTER(ei->socket.wq, wq);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700262
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 ei->socket.state = SS_UNCONNECTED;
264 ei->socket.flags = 0;
265 ei->socket.ops = NULL;
266 ei->socket.sk = NULL;
267 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
269 return &ei->vfs_inode;
270}
271
272static void sock_destroy_inode(struct inode *inode)
273{
Eric Dumazet43815482010-04-29 11:01:49 +0000274 struct socket_alloc *ei;
Eric Dumazeteaefd112011-02-18 03:26:36 +0000275 struct socket_wq *wq;
Eric Dumazet43815482010-04-29 11:01:49 +0000276
277 ei = container_of(inode, struct socket_alloc, vfs_inode);
Eric Dumazeteaefd112011-02-18 03:26:36 +0000278 wq = rcu_dereference_protected(ei->socket.wq, 1);
Lai Jiangshan61845222011-03-18 12:10:25 +0800279 kfree_rcu(wq, rcu);
Eric Dumazet43815482010-04-29 11:01:49 +0000280 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281}
282
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700283static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700285 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Christoph Lametera35afb82007-05-16 22:10:57 -0700287 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700289
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290static int init_inodecache(void)
291{
292 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700293 sizeof(struct socket_alloc),
294 0,
295 (SLAB_HWCACHE_ALIGN |
296 SLAB_RECLAIM_ACCOUNT |
Vladimir Davydov5d097052016-01-14 15:18:21 -0800297 SLAB_MEM_SPREAD | SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +0900298 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 if (sock_inode_cachep == NULL)
300 return -ENOMEM;
301 return 0;
302}
303
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700304static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700305 .alloc_inode = sock_alloc_inode,
306 .destroy_inode = sock_destroy_inode,
307 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308};
309
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700310/*
311 * sockfs_dname() is called from d_path().
312 */
313static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
314{
315 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
David Howellsc5ef6032015-03-17 22:26:16 +0000316 d_inode(dentry)->i_ino);
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700317}
318
Al Viro3ba13d12009-02-20 06:02:22 +0000319static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700320 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321};
322
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200323static int sockfs_xattr_get(const struct xattr_handler *handler,
324 struct dentry *dentry, struct inode *inode,
325 const char *suffix, void *value, size_t size)
326{
327 if (value) {
328 if (dentry->d_name.len + 1 > size)
329 return -ERANGE;
330 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
331 }
332 return dentry->d_name.len + 1;
333}
334
335#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
336#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
337#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
338
339static const struct xattr_handler sockfs_xattr_handler = {
340 .name = XATTR_NAME_SOCKPROTONAME,
341 .get = sockfs_xattr_get,
342};
343
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100344static int sockfs_security_xattr_set(const struct xattr_handler *handler,
345 struct dentry *dentry, struct inode *inode,
346 const char *suffix, const void *value,
347 size_t size, int flags)
348{
349 /* Handled by LSM. */
350 return -EAGAIN;
351}
352
353static const struct xattr_handler sockfs_security_xattr_handler = {
354 .prefix = XATTR_SECURITY_PREFIX,
355 .set = sockfs_security_xattr_set,
356};
357
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200358static const struct xattr_handler *sockfs_xattr_handlers[] = {
359 &sockfs_xattr_handler,
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100360 &sockfs_security_xattr_handler,
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200361 NULL
362};
363
Al Viroc74a1cb2011-01-12 16:59:34 -0500364static struct dentry *sockfs_mount(struct file_system_type *fs_type,
365 int flags, const char *dev_name, void *data)
366{
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200367 return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops,
368 sockfs_xattr_handlers,
369 &sockfs_dentry_operations, SOCKFS_MAGIC);
Al Viroc74a1cb2011-01-12 16:59:34 -0500370}
371
372static struct vfsmount *sock_mnt __read_mostly;
373
374static struct file_system_type sock_fs_type = {
375 .name = "sockfs",
376 .mount = sockfs_mount,
377 .kill_sb = kill_anon_super,
378};
379
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380/*
381 * Obtains the first available file descriptor and sets it up for use.
382 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800383 * These functions create file structures and maps them to fd space
384 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 * and file struct implicitly stored in sock->file.
386 * Note that another thread may close file descriptor before we return
387 * from this function. We use the fact that now we do not refer
388 * to socket after mapping. If one day we will need it, this
389 * function will increment ref. count on file by 1.
390 *
391 * In any case returned fd MAY BE not valid!
392 * This race condition is unavoidable
393 * with shared fd spaces, we cannot solve it inside kernel,
394 * but we take care of internal coherence yet.
395 */
396
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700397struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398{
Al Viro7cbe66b2009-08-05 19:59:08 +0400399 struct qstr name = { .name = "" };
Al Viro2c48b9c2009-08-09 00:52:35 +0400400 struct path path;
Al Viro7cbe66b2009-08-05 19:59:08 +0400401 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800402
Masatake YAMATO600e1772012-08-29 10:44:29 +0000403 if (dname) {
404 name.name = dname;
405 name.len = strlen(name.name);
406 } else if (sock->sk) {
407 name.name = sock->sk->sk_prot_creator->name;
408 name.len = strlen(name.name);
409 }
Nick Piggin4b936882011-01-07 17:50:07 +1100410 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
Al Viro28407632012-08-17 23:54:15 -0400411 if (unlikely(!path.dentry))
412 return ERR_PTR(-ENOMEM);
Al Viro2c48b9c2009-08-09 00:52:35 +0400413 path.mnt = mntget(sock_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
Al Viro2c48b9c2009-08-09 00:52:35 +0400415 d_instantiate(path.dentry, SOCK_INODE(sock));
Al Virocc3808f2009-08-06 09:43:59 +0400416
Al Viro2c48b9c2009-08-09 00:52:35 +0400417 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
Al Virocc3808f2009-08-06 09:43:59 +0400418 &socket_file_ops);
Viresh Kumarb5ffe632015-08-12 15:59:47 +0530419 if (IS_ERR(file)) {
Al Virocc3808f2009-08-06 09:43:59 +0400420 /* drop dentry, keep inode */
David Howellsc5ef6032015-03-17 22:26:16 +0000421 ihold(d_inode(path.dentry));
Al Viro2c48b9c2009-08-09 00:52:35 +0400422 path_put(&path);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700423 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400424 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800425
426 sock->file = file;
Ulrich Drepper77d27202008-07-23 21:29:35 -0700427 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800428 file->private_data = sock;
Al Viro28407632012-08-17 23:54:15 -0400429 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800430}
Al Viro56b31d12012-08-18 00:25:51 -0400431EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800432
Al Viro56b31d12012-08-18 00:25:51 -0400433static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800434{
435 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400436 int fd = get_unused_fd_flags(flags);
437 if (unlikely(fd < 0))
438 return fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800439
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700440 newfile = sock_alloc_file(sock, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -0400441 if (likely(!IS_ERR(newfile))) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800442 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400443 return fd;
444 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400445
Al Viro28407632012-08-17 23:54:15 -0400446 put_unused_fd(fd);
447 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448}
449
John Fastabend406a3c62012-07-20 10:39:25 +0000450struct socket *sock_from_file(struct file *file, int *err)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800451{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800452 if (file->f_op == &socket_file_ops)
453 return file->private_data; /* set in sock_map_fd */
454
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800455 *err = -ENOTSOCK;
456 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800457}
John Fastabend406a3c62012-07-20 10:39:25 +0000458EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800459
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700461 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 * @fd: file handle
463 * @err: pointer to an error code return
464 *
465 * The file handle passed in is locked and the socket it is bound
466 * too is returned. If an error occurs the err pointer is overwritten
467 * with a negative errno code and NULL is returned. The function checks
468 * for both invalid handles and passing a handle which is not a socket.
469 *
470 * On a success the socket object pointer is returned.
471 */
472
473struct socket *sockfd_lookup(int fd, int *err)
474{
475 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 struct socket *sock;
477
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700478 file = fget(fd);
479 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 *err = -EBADF;
481 return NULL;
482 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700483
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800484 sock = sock_from_file(file, err);
485 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 return sock;
488}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700489EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800491static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
492{
Al Viro00e188e2014-03-03 23:48:18 -0500493 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800494 struct socket *sock;
495
Hua Zhong36725582006-04-19 15:25:02 -0700496 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500497 if (f.file) {
498 sock = sock_from_file(f.file, err);
499 if (likely(sock)) {
500 *fput_needed = f.flags;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800501 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500502 }
503 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800504 }
505 return NULL;
506}
507
Masatake YAMATO600e1772012-08-29 10:44:29 +0000508static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
509 size_t size)
510{
511 ssize_t len;
512 ssize_t used = 0;
513
David Howellsc5ef6032015-03-17 22:26:16 +0000514 len = security_inode_listsecurity(d_inode(dentry), buffer, size);
Masatake YAMATO600e1772012-08-29 10:44:29 +0000515 if (len < 0)
516 return len;
517 used += len;
518 if (buffer) {
519 if (size < used)
520 return -ERANGE;
521 buffer += len;
522 }
523
524 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
525 used += len;
526 if (buffer) {
527 if (size < used)
528 return -ERANGE;
529 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
530 buffer += len;
531 }
532
533 return used;
534}
535
536static const struct inode_operations sockfs_inode_ops = {
Masatake YAMATO600e1772012-08-29 10:44:29 +0000537 .listxattr = sockfs_listxattr,
538};
539
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540/**
541 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700542 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 * Allocate a new inode and socket object. The two are bound together
544 * and initialised. The socket is then returned. If we are out of inodes
545 * NULL is returned.
546 */
547
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800548struct socket *sock_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700550 struct inode *inode;
551 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200553 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 if (!inode)
555 return NULL;
556
557 sock = SOCKET_I(inode);
558
Eric Dumazet29a020d2009-09-15 02:39:20 -0700559 kmemcheck_annotate_bitfield(sock, type);
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400560 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700561 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100562 inode->i_uid = current_fsuid();
563 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000564 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
Alex Shi19e8d692012-05-14 14:15:31 -0700566 this_cpu_add(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 return sock;
568}
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800569EXPORT_SYMBOL(sock_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571/**
572 * sock_release - close a socket
573 * @sock: socket to close
574 *
575 * The socket is released from the protocol stack if it has a release
576 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700577 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700579
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580void sock_release(struct socket *sock)
581{
582 if (sock->ops) {
583 struct module *owner = sock->ops->owner;
584
585 sock->ops->release(sock);
586 sock->ops = NULL;
587 module_put(owner);
588 }
589
Eric Dumazeteaefd112011-02-18 03:26:36 +0000590 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800591 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Alex Shi19e8d692012-05-14 14:15:31 -0700593 this_cpu_sub(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 if (!sock->file) {
595 iput(SOCK_INODE(sock));
596 return;
597 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700598 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599}
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{
Al Viro6aa24812015-03-21 19:56:16 -0400638 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, 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
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700643/*
644 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
645 */
646void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
647 struct sk_buff *skb)
648{
Patrick Ohly20d49472009-02-12 05:03:38 +0000649 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400650 struct scm_timestamping tss;
Patrick Ohly20d49472009-02-12 05:03:38 +0000651 int empty = 1;
652 struct skb_shared_hwtstamps *shhwtstamps =
653 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700654
Patrick Ohly20d49472009-02-12 05:03:38 +0000655 /* Race occurred between timestamp enabling and packet
656 receiving. Fill in the current time for now. */
657 if (need_software_tstamp && skb->tstamp.tv64 == 0)
658 __net_timestamp(skb);
659
660 if (need_software_tstamp) {
661 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
662 struct timeval tv;
663 skb_get_timestamp(skb, &tv);
664 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
665 sizeof(tv), &tv);
666 } else {
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400667 struct timespec ts;
668 skb_get_timestampns(skb, &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000669 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400670 sizeof(ts), &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000671 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700672 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000673
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400674 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400675 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400676 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000677 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400678 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400679 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400680 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2))
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400681 empty = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000682 if (!empty)
683 put_cmsg(msg, SOL_SOCKET,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400684 SCM_TIMESTAMPING, sizeof(tss), &tss);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700685}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300686EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
687
Johannes Berg6e3e9392011-11-09 10:15:42 +0100688void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
689 struct sk_buff *skb)
690{
691 int ack;
692
693 if (!sock_flag(sk, SOCK_WIFI_STATUS))
694 return;
695 if (!skb->wifi_acked_valid)
696 return;
697
698 ack = skb->wifi_acked;
699
700 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
701}
702EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
703
stephen hemminger11165f12010-10-18 14:27:29 +0000704static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
705 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700706{
Eyal Birger744d5a32015-03-01 14:58:31 +0200707 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
Neil Horman3b885782009-10-12 13:26:31 -0700708 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
Eyal Birger744d5a32015-03-01 14:58:31 +0200709 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
Neil Horman3b885782009-10-12 13:26:31 -0700710}
711
Eric Dumazet767dd032010-04-28 19:14:43 +0000712void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700713 struct sk_buff *skb)
714{
715 sock_recv_timestamp(msg, sk, skb);
716 sock_recv_drops(msg, sk, skb);
717}
Eric Dumazet767dd032010-04-28 19:14:43 +0000718EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700719
Ying Xue1b784142015-03-02 15:37:48 +0800720static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
Al Viro2da62902015-03-14 21:13:46 -0400721 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722{
Al Viro2da62902015-03-14 21:13:46 -0400723 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724}
725
Al Viro2da62902015-03-14 21:13:46 -0400726int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700727{
Al Viro2da62902015-03-14 21:13:46 -0400728 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700729
Al Viro2da62902015-03-14 21:13:46 -0400730 return err ?: sock_recvmsg_nosec(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700732EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Martin Lucinac1249c02010-12-10 00:04:05 +0000734/**
735 * kernel_recvmsg - Receive a message from a socket (kernel space)
736 * @sock: The socket to receive the message from
737 * @msg: Received message
738 * @vec: Input s/g array for message data
739 * @num: Size of input s/g array
740 * @size: Number of bytes to read
741 * @flags: Message flags (MSG_DONTWAIT, etc...)
742 *
743 * On return the msg structure contains the scatter/gather array passed in the
744 * vec argument. The array is modified so that it consists of the unfilled
745 * portion of the original array.
746 *
747 * The returned value is the total number of bytes received, or an error.
748 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700749int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
750 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751{
752 mm_segment_t oldfs = get_fs();
753 int result;
754
Al Viro6aa24812015-03-21 19:56:16 -0400755 iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 set_fs(KERNEL_DS);
Al Viro2da62902015-03-14 21:13:46 -0400757 result = sock_recvmsg(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 set_fs(oldfs);
759 return result;
760}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700761EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300763static ssize_t sock_sendpage(struct file *file, struct page *page,
764 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765{
766 struct socket *sock;
767 int flags;
768
Eric Dumazetb69aee02005-09-06 14:42:45 -0700769 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Eric Dumazet35f9c092012-04-05 03:05:35 +0000771 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
772 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
773 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
Linus Torvaldse6949582009-08-13 08:28:36 -0700775 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776}
777
Jens Axboe9c55e012007-11-06 23:30:13 -0800778static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700779 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800780 unsigned int flags)
781{
782 struct socket *sock = file->private_data;
783
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800784 if (unlikely(!sock->ops->splice_read))
785 return -EINVAL;
786
Jens Axboe9c55e012007-11-06 23:30:13 -0800787 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
788}
789
Al Viro8ae5e032014-11-28 19:40:50 -0500790static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800791{
Al Viro6d652332015-01-30 16:12:56 -0500792 struct file *file = iocb->ki_filp;
793 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700794 struct msghdr msg = {.msg_iter = *to,
795 .msg_iocb = iocb};
Al Viro8ae5e032014-11-28 19:40:50 -0500796 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800797
Al Viro8ae5e032014-11-28 19:40:50 -0500798 if (file->f_flags & O_NONBLOCK)
799 msg.msg_flags = MSG_DONTWAIT;
800
801 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800802 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700803
Christoph Hellwig66ee59a2015-02-11 19:56:46 +0100804 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800805 return 0;
806
Al Viro2da62902015-03-14 21:13:46 -0400807 res = sock_recvmsg(sock, &msg, msg.msg_flags);
Al Viro8ae5e032014-11-28 19:40:50 -0500808 *to = msg.msg_iter;
809 return res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800810}
811
Al Viro8ae5e032014-11-28 19:40:50 -0500812static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813{
Al Viro6d652332015-01-30 16:12:56 -0500814 struct file *file = iocb->ki_filp;
815 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700816 struct msghdr msg = {.msg_iter = *from,
817 .msg_iocb = iocb};
Al Viro8ae5e032014-11-28 19:40:50 -0500818 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800819
Al Viro8ae5e032014-11-28 19:40:50 -0500820 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800821 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700822
Al Viro8ae5e032014-11-28 19:40:50 -0500823 if (file->f_flags & O_NONBLOCK)
824 msg.msg_flags = MSG_DONTWAIT;
825
Al Viro6d652332015-01-30 16:12:56 -0500826 if (sock->type == SOCK_SEQPACKET)
827 msg.msg_flags |= MSG_EOR;
828
Al Virod8725c82014-12-11 00:02:50 -0500829 res = sock_sendmsg(sock, &msg);
Al Viro8ae5e032014-11-28 19:40:50 -0500830 *from = msg.msg_iter;
831 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832}
833
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834/*
835 * Atomic setting of ioctl hooks to avoid race
836 * with module unload.
837 */
838
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800839static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700840static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
Eric W. Biederman881d9662007-09-17 11:56:21 -0700842void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800844 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800846 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847}
848EXPORT_SYMBOL(brioctl_set);
849
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800850static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700851static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Eric W. Biederman881d9662007-09-17 11:56:21 -0700853void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800855 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800857 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858}
859EXPORT_SYMBOL(vlan_ioctl_set);
860
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800861static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700862static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700864void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800866 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800868 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869}
870EXPORT_SYMBOL(dlci_ioctl_set);
871
Arnd Bergmann6b960182009-11-06 23:10:54 -0800872static long sock_do_ioctl(struct net *net, struct socket *sock,
873 unsigned int cmd, unsigned long arg)
874{
875 int err;
876 void __user *argp = (void __user *)arg;
877
878 err = sock->ops->ioctl(sock, cmd, arg);
879
880 /*
881 * If this ioctl is unknown try to hand it down
882 * to the NIC driver.
883 */
884 if (err == -ENOIOCTLCMD)
885 err = dev_ioctl(net, cmd, argp);
886
887 return err;
888}
889
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890/*
891 * With an ioctl, arg may well be a user mode pointer, but we don't know
892 * what to do with it - that's up to the protocol still.
893 */
894
895static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
896{
897 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700898 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 void __user *argp = (void __user *)arg;
900 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700901 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
Eric Dumazetb69aee02005-09-06 14:42:45 -0700903 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700904 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900905 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700907 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 } else
Johannes Berg3d23e342009-09-29 23:27:28 +0200909#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700911 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 } else
Johannes Berg3d23e342009-09-29 23:27:28 +0200913#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700914 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 case FIOSETOWN:
916 case SIOCSPGRP:
917 err = -EFAULT;
918 if (get_user(pid, (int __user *)argp))
919 break;
Jeff Laytone0b93ed2014-08-22 11:27:32 -0400920 f_setown(sock->file, pid, 1);
921 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 break;
923 case FIOGETOWN:
924 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700925 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700926 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 break;
928 case SIOCGIFBR:
929 case SIOCSIFBR:
930 case SIOCBRADDBR:
931 case SIOCBRDELBR:
932 err = -ENOPKG;
933 if (!br_ioctl_hook)
934 request_module("bridge");
935
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800936 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700937 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700938 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800939 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 break;
941 case SIOCGIFVLAN:
942 case SIOCSIFVLAN:
943 err = -ENOPKG;
944 if (!vlan_ioctl_hook)
945 request_module("8021q");
946
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800947 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700949 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800950 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 case SIOCADDDLCI:
953 case SIOCDELDLCI:
954 err = -ENOPKG;
955 if (!dlci_ioctl_hook)
956 request_module("dlci");
957
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -0700958 mutex_lock(&dlci_ioctl_mutex);
959 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -0700961 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 break;
963 default:
Arnd Bergmann6b960182009-11-06 23:10:54 -0800964 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700966 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 return err;
968}
969
970int sock_create_lite(int family, int type, int protocol, struct socket **res)
971{
972 int err;
973 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700974
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 err = security_socket_create(family, type, protocol, 1);
976 if (err)
977 goto out;
978
979 sock = sock_alloc();
980 if (!sock) {
981 err = -ENOMEM;
982 goto out;
983 }
984
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -0700986 err = security_socket_post_create(sock, family, type, protocol, 1);
987 if (err)
988 goto out_release;
989
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990out:
991 *res = sock;
992 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -0700993out_release:
994 sock_release(sock);
995 sock = NULL;
996 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700998EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
1000/* No kernel lock held - perfect */
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001001static unsigned int sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002{
Eliezer Tamircbf55002013-07-08 16:20:34 +03001003 unsigned int busy_flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 struct socket *sock;
1005
1006 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001007 * We can't return errors to poll, so it's either yes or no.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 */
Eric Dumazetb69aee02005-09-06 14:42:45 -07001009 sock = file->private_data;
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001010
Eliezer Tamircbf55002013-07-08 16:20:34 +03001011 if (sk_can_busy_loop(sock->sk)) {
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001012 /* this socket can poll_ll so tell the system call */
Eliezer Tamircbf55002013-07-08 16:20:34 +03001013 busy_flag = POLL_BUSY_LOOP;
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001014
1015 /* once, only if requested by syscall */
Eliezer Tamircbf55002013-07-08 16:20:34 +03001016 if (wait && (wait->_key & POLL_BUSY_LOOP))
1017 sk_busy_loop(sock->sk, 1);
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001018 }
1019
Eliezer Tamircbf55002013-07-08 16:20:34 +03001020 return busy_flag | sock->ops->poll(file, sock, wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021}
1022
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001023static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001025 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026
1027 return sock->ops->mmap(file, sock, vma);
1028}
1029
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001030static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 sock_release(SOCKET_I(inode));
1033 return 0;
1034}
1035
1036/*
1037 * Update the socket async list
1038 *
1039 * Fasync_list locking strategy.
1040 *
1041 * 1. fasync_list is modified only under process context socket lock
1042 * i.e. under semaphore.
1043 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001044 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 */
1046
1047static int sock_fasync(int fd, struct file *filp, int on)
1048{
Eric Dumazet989a2972010-04-14 09:55:35 +00001049 struct socket *sock = filp->private_data;
1050 struct sock *sk = sock->sk;
Eric Dumazeteaefd112011-02-18 03:26:36 +00001051 struct socket_wq *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052
Eric Dumazet989a2972010-04-14 09:55:35 +00001053 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055
1056 lock_sock(sk);
Hannes Frederic Sowa1e1d04e2016-04-05 17:10:15 +02001057 wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk));
Eric Dumazeteaefd112011-02-18 03:26:36 +00001058 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059
Eric Dumazeteaefd112011-02-18 03:26:36 +00001060 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001061 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001062 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001063 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064
Eric Dumazet989a2972010-04-14 09:55:35 +00001065 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 return 0;
1067}
1068
Eric Dumazetceb5d582015-11-29 20:03:11 -08001069/* This function may be called only under rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070
Eric Dumazetceb5d582015-11-29 20:03:11 -08001071int sock_wake_async(struct socket_wq *wq, int how, int band)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072{
Eric Dumazetceb5d582015-11-29 20:03:11 -08001073 if (!wq || !wq->fasync_list)
1074 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001075
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001076 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001077 case SOCK_WAKE_WAITD:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001078 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 break;
1080 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001081 case SOCK_WAKE_SPACE:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001082 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 break;
1084 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001085 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001086call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001087 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001089 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001090 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08001092
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 return 0;
1094}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001095EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096
Pavel Emelyanov721db932010-09-29 16:06:32 +04001097int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001098 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099{
1100 int err;
1101 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001102 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103
1104 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001105 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 */
1107 if (family < 0 || family >= NPROTO)
1108 return -EAFNOSUPPORT;
1109 if (type < 0 || type >= SOCK_MAX)
1110 return -EINVAL;
1111
1112 /* Compatibility.
1113
1114 This uglymoron is moved from INET layer to here to avoid
1115 deadlock in module load.
1116 */
1117 if (family == PF_INET && type == SOCK_PACKET) {
liping.zhangf3c98692016-03-11 23:08:36 +08001118 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1119 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 family = PF_PACKET;
1121 }
1122
1123 err = security_socket_create(family, type, protocol, kern);
1124 if (err)
1125 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001126
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001127 /*
1128 * Allocate the socket and allow the family to set things up. if
1129 * the protocol is 0, the family is instructed to select an appropriate
1130 * default.
1131 */
1132 sock = sock_alloc();
1133 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001134 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001135 return -ENFILE; /* Not exactly a match, but its the
1136 closest posix thing */
1137 }
1138
1139 sock->type = type;
1140
Johannes Berg95a5afc2008-10-16 15:24:51 -07001141#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001142 /* Attempt to load a protocol module if the find failed.
1143 *
1144 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 * requested real, full-featured networking support upon configuration.
1146 * Otherwise module support will break!
1147 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001148 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001149 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150#endif
1151
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001152 rcu_read_lock();
1153 pf = rcu_dereference(net_families[family]);
1154 err = -EAFNOSUPPORT;
1155 if (!pf)
1156 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
1158 /*
1159 * We will call the ->create function, that possibly is in a loadable
1160 * module, so we have to bump that loadable module refcnt first.
1161 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001162 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 goto out_release;
1164
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001165 /* Now protected by module ref count */
1166 rcu_read_unlock();
1167
Eric Paris3f378b62009-11-05 22:18:14 -08001168 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001169 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001171
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 /*
1173 * Now to bump the refcnt of the [loadable] module that owns this
1174 * socket at sock_release time we decrement its refcnt.
1175 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001176 if (!try_module_get(sock->ops->owner))
1177 goto out_module_busy;
1178
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 /*
1180 * Now that we're done with the ->create function, the [loadable]
1181 * module can have its refcnt decremented
1182 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001183 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001184 err = security_socket_post_create(sock, family, type, protocol, kern);
1185 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001186 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001187 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001189 return 0;
1190
1191out_module_busy:
1192 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001194 sock->ops = NULL;
1195 module_put(pf->owner);
1196out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001198 return err;
1199
1200out_release:
1201 rcu_read_unlock();
1202 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001204EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205
1206int sock_create(int family, int type, int protocol, struct socket **res)
1207{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001208 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001210EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001212int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213{
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001214 return __sock_create(net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001216EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001218SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219{
1220 int retval;
1221 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001222 int flags;
1223
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001224 /* Check the SOCK_* constants for consistency. */
1225 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1226 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1227 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1228 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1229
Ulrich Dreppera677a032008-07-23 21:29:17 -07001230 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001231 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001232 return -EINVAL;
1233 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001235 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1236 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1237
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 retval = sock_create(family, type, protocol, &sock);
1239 if (retval < 0)
1240 goto out;
1241
Ulrich Drepper77d27202008-07-23 21:29:35 -07001242 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 if (retval < 0)
1244 goto out_release;
1245
1246out:
1247 /* It may be already another descriptor 8) Not kernel problem. */
1248 return retval;
1249
1250out_release:
1251 sock_release(sock);
1252 return retval;
1253}
1254
1255/*
1256 * Create a pair of connected sockets.
1257 */
1258
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001259SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1260 int __user *, usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261{
1262 struct socket *sock1, *sock2;
1263 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001264 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001265 int flags;
1266
1267 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001268 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001269 return -EINVAL;
1270 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001272 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1273 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1274
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 /*
1276 * Obtain the first socket and check if the underlying protocol
1277 * supports the socketpair call.
1278 */
1279
1280 err = sock_create(family, type, protocol, &sock1);
1281 if (err < 0)
1282 goto out;
1283
1284 err = sock_create(family, type, protocol, &sock2);
1285 if (err < 0)
1286 goto out_release_1;
1287
1288 err = sock1->ops->socketpair(sock1, sock2);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001289 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 goto out_release_both;
1291
Al Viro28407632012-08-17 23:54:15 -04001292 fd1 = get_unused_fd_flags(flags);
David S. Millerbf3c23d2007-10-29 21:54:02 -07001293 if (unlikely(fd1 < 0)) {
1294 err = fd1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 goto out_release_both;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001296 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001297
Al Viro28407632012-08-17 23:54:15 -04001298 fd2 = get_unused_fd_flags(flags);
Al Viro198de4d2009-08-05 19:29:23 +04001299 if (unlikely(fd2 < 0)) {
1300 err = fd2;
Yann Droneaudd73aa282013-12-09 22:42:20 +01001301 goto out_put_unused_1;
Al Viro28407632012-08-17 23:54:15 -04001302 }
1303
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001304 newfile1 = sock_alloc_file(sock1, flags, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301305 if (IS_ERR(newfile1)) {
Al Viro28407632012-08-17 23:54:15 -04001306 err = PTR_ERR(newfile1);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001307 goto out_put_unused_both;
Al Viro28407632012-08-17 23:54:15 -04001308 }
1309
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001310 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001311 if (IS_ERR(newfile2)) {
1312 err = PTR_ERR(newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001313 goto out_fput_1;
Al Virodb349502007-02-07 01:48:00 -05001314 }
1315
Yann Droneaudd73aa282013-12-09 22:42:20 +01001316 err = put_user(fd1, &usockvec[0]);
1317 if (err)
1318 goto out_fput_both;
1319
1320 err = put_user(fd2, &usockvec[1]);
1321 if (err)
1322 goto out_fput_both;
1323
Al Viro157cf642008-12-14 04:57:47 -05001324 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001325
Al Virodb349502007-02-07 01:48:00 -05001326 fd_install(fd1, newfile1);
1327 fd_install(fd2, newfile2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 /* fd1 and fd2 may be already another descriptors.
1329 * Not kernel problem.
1330 */
1331
Yann Droneaudd73aa282013-12-09 22:42:20 +01001332 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333
Yann Droneaudd73aa282013-12-09 22:42:20 +01001334out_fput_both:
1335 fput(newfile2);
1336 fput(newfile1);
1337 put_unused_fd(fd2);
1338 put_unused_fd(fd1);
1339 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340
Yann Droneaudd73aa282013-12-09 22:42:20 +01001341out_fput_1:
1342 fput(newfile1);
1343 put_unused_fd(fd2);
1344 put_unused_fd(fd1);
1345 sock_release(sock2);
1346 goto out;
1347
1348out_put_unused_both:
1349 put_unused_fd(fd2);
1350out_put_unused_1:
1351 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352out_release_both:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001353 sock_release(sock2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354out_release_1:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001355 sock_release(sock1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356out:
1357 return err;
1358}
1359
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360/*
1361 * Bind a name to a socket. Nothing much to do here since it's
1362 * the protocol's responsibility to handle the local address.
1363 *
1364 * We move the socket address to kernel space before we call
1365 * the protocol layer (having also checked the address is ok).
1366 */
1367
Heiko Carstens20f37032009-01-14 14:14:23 +01001368SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369{
1370 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001371 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001372 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001374 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001375 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001376 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001377 if (err >= 0) {
1378 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001379 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001380 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001381 if (!err)
1382 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001383 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001384 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001386 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001387 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 return err;
1389}
1390
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391/*
1392 * Perform a listen. Basically, we allow the protocol to do anything
1393 * necessary for a listen, and if that works, we mark the socket as
1394 * ready for listening.
1395 */
1396
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001397SYSCALL_DEFINE2(listen, int, fd, int, backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398{
1399 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001400 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001401 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001402
1403 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1404 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001405 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001406 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001407 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408
1409 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001410 if (!err)
1411 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001413 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 }
1415 return err;
1416}
1417
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418/*
1419 * For accept, we attempt to create a new socket, set up the link
1420 * with the client, wake up the client, then return the new
1421 * connected fd. We collect the address of the connector in kernel
1422 * space and move it to user at the very end. This is unclean because
1423 * we open the socket then return an error.
1424 *
1425 * 1003.1g adds the ability to recvmsg() to query connection pending
1426 * status to recvmsg. We need to add that support in a way thats
1427 * clean when we restucture accept also.
1428 */
1429
Heiko Carstens20f37032009-01-14 14:14:23 +01001430SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1431 int __user *, upeer_addrlen, int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432{
1433 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001434 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001435 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001436 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437
Ulrich Drepper77d27202008-07-23 21:29:35 -07001438 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001439 return -EINVAL;
1440
1441 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1442 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1443
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001444 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445 if (!sock)
1446 goto out;
1447
1448 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001449 newsock = sock_alloc();
1450 if (!newsock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 goto out_put;
1452
1453 newsock->type = sock->type;
1454 newsock->ops = sock->ops;
1455
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456 /*
1457 * We don't need try_module_get here, as the listening socket (sock)
1458 * has the protocol module (sock->ops->owner) held.
1459 */
1460 __module_get(newsock->ops->owner);
1461
Al Viro28407632012-08-17 23:54:15 -04001462 newfd = get_unused_fd_flags(flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001463 if (unlikely(newfd < 0)) {
1464 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001465 sock_release(newsock);
1466 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001467 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001468 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301469 if (IS_ERR(newfile)) {
Al Viro28407632012-08-17 23:54:15 -04001470 err = PTR_ERR(newfile);
1471 put_unused_fd(newfd);
1472 sock_release(newsock);
1473 goto out_put;
1474 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001475
Frank Filza79af592005-09-27 15:23:38 -07001476 err = security_socket_accept(sock, newsock);
1477 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001478 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001479
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1481 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001482 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483
1484 if (upeer_sockaddr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001485 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001486 &len, 2) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001488 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001490 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001491 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001493 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494 }
1495
1496 /* File flags are not inherited via accept() unlike another OSes. */
1497
David S. Miller39d8c1b2006-03-20 17:13:49 -08001498 fd_install(newfd, newfile);
1499 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001502 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503out:
1504 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001505out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001506 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001507 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 goto out_put;
1509}
1510
Heiko Carstens20f37032009-01-14 14:14:23 +01001511SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1512 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001513{
Ulrich Drepperde11def2008-11-19 15:36:14 -08001514 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001515}
1516
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517/*
1518 * Attempt to connect to a socket with the server address. The address
1519 * is in user space so we verify it is OK and move it to kernel space.
1520 *
1521 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1522 * break bindings
1523 *
1524 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1525 * other SEQPACKET protocols that take time to connect() as it doesn't
1526 * include the -EINPROGRESS status for such sockets.
1527 */
1528
Heiko Carstens20f37032009-01-14 14:14:23 +01001529SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1530 int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531{
1532 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001533 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001534 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001536 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 if (!sock)
1538 goto out;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001539 err = move_addr_to_kernel(uservaddr, addrlen, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 if (err < 0)
1541 goto out_put;
1542
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001543 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001544 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 if (err)
1546 goto out_put;
1547
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001548 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 sock->file->f_flags);
1550out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001551 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552out:
1553 return err;
1554}
1555
1556/*
1557 * Get the local address ('name') of a socket object. Move the obtained
1558 * name to user space.
1559 */
1560
Heiko Carstens20f37032009-01-14 14:14:23 +01001561SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1562 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563{
1564 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001565 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001566 int len, err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001567
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001568 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 if (!sock)
1570 goto out;
1571
1572 err = security_socket_getsockname(sock);
1573 if (err)
1574 goto out_put;
1575
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001576 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 if (err)
1578 goto out_put;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001579 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580
1581out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001582 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583out:
1584 return err;
1585}
1586
1587/*
1588 * Get the remote address ('name') of a socket object. Move the obtained
1589 * name to user space.
1590 */
1591
Heiko Carstens20f37032009-01-14 14:14:23 +01001592SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1593 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594{
1595 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001596 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001597 int len, err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001599 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1600 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601 err = security_socket_getpeername(sock);
1602 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001603 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604 return err;
1605 }
1606
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001607 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001608 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001609 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 if (!err)
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001611 err = move_addr_to_user(&address, len, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001612 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001613 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 }
1615 return err;
1616}
1617
1618/*
1619 * Send a datagram to a given address. We move the address into kernel
1620 * space and check the user space data area is readable before invoking
1621 * the protocol.
1622 */
1623
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001624SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001625 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001626 int, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627{
1628 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001629 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 int err;
1631 struct msghdr msg;
1632 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001633 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001634
Al Viro602bd0e2015-03-21 19:12:32 -04001635 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
1636 if (unlikely(err))
1637 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001638 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1639 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001640 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001641
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001642 msg.msg_name = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001643 msg.msg_control = NULL;
1644 msg.msg_controllen = 0;
1645 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001646 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001647 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 if (err < 0)
1649 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001650 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001651 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652 }
1653 if (sock->file->f_flags & O_NONBLOCK)
1654 flags |= MSG_DONTWAIT;
1655 msg.msg_flags = flags;
Al Virod8725c82014-12-11 00:02:50 -05001656 err = sock_sendmsg(sock, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001658out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001659 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001660out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661 return err;
1662}
1663
1664/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001665 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 */
1667
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001668SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001669 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670{
1671 return sys_sendto(fd, buff, len, flags, NULL, 0);
1672}
1673
1674/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001675 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676 * sender. We verify the buffers are writable and if needed move the
1677 * sender address from kernel to user space.
1678 */
1679
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001680SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
Eric Dumazet95c96172012-04-15 05:58:06 +00001681 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001682 int __user *, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683{
1684 struct socket *sock;
1685 struct iovec iov;
1686 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001687 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001688 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001689 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690
Al Viro602bd0e2015-03-21 19:12:32 -04001691 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
1692 if (unlikely(err))
1693 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001694 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001696 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001698 msg.msg_control = NULL;
1699 msg.msg_controllen = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01001700 /* Save some cycles and don't copy the address if not needed */
1701 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1702 /* We assume all kernel code knows the size of sockaddr_storage */
1703 msg.msg_namelen = 0;
tadeusz.struk@intel.com130ed5d2015-12-15 10:46:17 -08001704 msg.msg_iocb = NULL;
Alexander Potapenkoae0ebdb2017-03-08 18:08:16 +01001705 msg.msg_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706 if (sock->file->f_flags & O_NONBLOCK)
1707 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04001708 err = sock_recvmsg(sock, &msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001710 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001711 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001712 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001713 if (err2 < 0)
1714 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001716
1717 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001718out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719 return err;
1720}
1721
1722/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001723 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724 */
1725
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02001726SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1727 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728{
1729 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1730}
1731
1732/*
1733 * Set a socket option. Because we don't know the option lengths we have
1734 * to pass the user mode parameter for the protocols to sort out.
1735 */
1736
Heiko Carstens20f37032009-01-14 14:14:23 +01001737SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1738 char __user *, optval, int, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001740 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741 struct socket *sock;
1742
1743 if (optlen < 0)
1744 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001745
1746 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1747 if (sock != NULL) {
1748 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001749 if (err)
1750 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751
1752 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001753 err =
1754 sock_setsockopt(sock, level, optname, optval,
1755 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001757 err =
1758 sock->ops->setsockopt(sock, level, optname, optval,
1759 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001760out_put:
1761 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762 }
1763 return err;
1764}
1765
1766/*
1767 * Get a socket option. Because we don't know the option lengths we have
1768 * to pass a user mode parameter for the protocols to sort out.
1769 */
1770
Heiko Carstens20f37032009-01-14 14:14:23 +01001771SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1772 char __user *, optval, int __user *, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001774 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775 struct socket *sock;
1776
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001777 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1778 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001779 err = security_socket_getsockopt(sock, level, optname);
1780 if (err)
1781 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782
1783 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001784 err =
1785 sock_getsockopt(sock, level, optname, optval,
1786 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001787 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001788 err =
1789 sock->ops->getsockopt(sock, level, optname, optval,
1790 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001791out_put:
1792 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793 }
1794 return err;
1795}
1796
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797/*
1798 * Shutdown a socket.
1799 */
1800
Heiko Carstens754fe8d2009-01-14 14:14:09 +01001801SYSCALL_DEFINE2(shutdown, int, fd, int, how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001803 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 struct socket *sock;
1805
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001806 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1807 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001809 if (!err)
1810 err = sock->ops->shutdown(sock, how);
1811 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812 }
1813 return err;
1814}
1815
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001816/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 * fields which are the same type (int / unsigned) on our platforms.
1818 */
1819#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1820#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1821#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1822
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001823struct used_address {
1824 struct sockaddr_storage name;
1825 unsigned int name_len;
1826};
1827
Al Viroda184282015-03-21 19:29:06 -04001828static int copy_msghdr_from_user(struct msghdr *kmsg,
1829 struct user_msghdr __user *umsg,
1830 struct sockaddr __user **save_addr,
1831 struct iovec **iov)
Dan Carpenter1661bf32013-10-03 00:27:20 +03001832{
Al Viro08adb7d2014-11-10 20:23:13 -05001833 struct sockaddr __user *uaddr;
1834 struct iovec __user *uiov;
Al Viroc0371da2014-11-24 10:42:55 -05001835 size_t nr_segs;
Al Viro08adb7d2014-11-10 20:23:13 -05001836 ssize_t err;
1837
1838 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
1839 __get_user(uaddr, &umsg->msg_name) ||
1840 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
1841 __get_user(uiov, &umsg->msg_iov) ||
Al Viroc0371da2014-11-24 10:42:55 -05001842 __get_user(nr_segs, &umsg->msg_iovlen) ||
Al Viro08adb7d2014-11-10 20:23:13 -05001843 __get_user(kmsg->msg_control, &umsg->msg_control) ||
1844 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
1845 __get_user(kmsg->msg_flags, &umsg->msg_flags))
Dan Carpenter1661bf32013-10-03 00:27:20 +03001846 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00001847
Al Viro08adb7d2014-11-10 20:23:13 -05001848 if (!uaddr)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07001849 kmsg->msg_namelen = 0;
1850
Matthew Leachdbb490b2014-03-11 11:58:27 +00001851 if (kmsg->msg_namelen < 0)
1852 return -EINVAL;
1853
Dan Carpenter1661bf32013-10-03 00:27:20 +03001854 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03001855 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05001856
1857 if (save_addr)
1858 *save_addr = uaddr;
1859
1860 if (uaddr && kmsg->msg_namelen) {
1861 if (!save_addr) {
1862 err = move_addr_to_kernel(uaddr, kmsg->msg_namelen,
1863 kmsg->msg_name);
1864 if (err < 0)
1865 return err;
1866 }
1867 } else {
1868 kmsg->msg_name = NULL;
1869 kmsg->msg_namelen = 0;
1870 }
1871
Al Viroc0371da2014-11-24 10:42:55 -05001872 if (nr_segs > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05001873 return -EMSGSIZE;
1874
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07001875 kmsg->msg_iocb = NULL;
1876
Al Viroda184282015-03-21 19:29:06 -04001877 return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs,
1878 UIO_FASTIOV, iov, &kmsg->msg_iter);
Dan Carpenter1661bf32013-10-03 00:27:20 +03001879}
1880
Al Viro666547f2014-04-06 14:03:05 -04001881static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00001882 struct msghdr *msg_sys, unsigned int flags,
Tom Herbert28a94d82016-03-07 14:11:02 -08001883 struct used_address *used_address,
1884 unsigned int allowed_msghdr_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001886 struct compat_msghdr __user *msg_compat =
1887 (struct compat_msghdr __user *)msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001888 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07001890 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001891 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1892 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893 unsigned char *ctl_buf = ctl;
Al Virod8725c82014-12-11 00:02:50 -05001894 int ctl_len;
Al Viro08adb7d2014-11-10 20:23:13 -05001895 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001896
Al Viro08adb7d2014-11-10 20:23:13 -05001897 msg_sys->msg_name = &address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898
Al Viro08449322014-11-09 22:33:45 -05001899 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05001900 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
Al Viro08449322014-11-09 22:33:45 -05001901 else
Al Viro08adb7d2014-11-10 20:23:13 -05001902 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001903 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04001904 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905
1906 err = -ENOBUFS;
1907
Anton Blanchard228e5482011-05-02 20:21:35 +00001908 if (msg_sys->msg_controllen > INT_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 goto out_freeiov;
Tom Herbert28a94d82016-03-07 14:11:02 -08001910 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
Anton Blanchard228e5482011-05-02 20:21:35 +00001911 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001913 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00001914 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001915 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 if (err)
1917 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00001918 ctl_buf = msg_sys->msg_control;
1919 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920 } else if (ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001921 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001923 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 goto out_freeiov;
1925 }
1926 err = -EFAULT;
1927 /*
Anton Blanchard228e5482011-05-02 20:21:35 +00001928 * Careful! Before this, msg_sys->msg_control contains a user pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1930 * checking falls down on this.
1931 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00001932 if (copy_from_user(ctl_buf,
Anton Blanchard228e5482011-05-02 20:21:35 +00001933 (void __user __force *)msg_sys->msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001934 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00001936 msg_sys->msg_control = ctl_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937 }
Anton Blanchard228e5482011-05-02 20:21:35 +00001938 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939
1940 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00001941 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001942 /*
1943 * If this is sendmmsg() and current destination address is same as
1944 * previously succeeded address, omit asking LSM's decision.
1945 * used_address->name_len is initialized to UINT_MAX so that the first
1946 * destination address never matches.
1947 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07001948 if (used_address && msg_sys->msg_name &&
1949 used_address->name_len == msg_sys->msg_namelen &&
1950 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001951 used_address->name_len)) {
Al Virod8725c82014-12-11 00:02:50 -05001952 err = sock_sendmsg_nosec(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001953 goto out_freectl;
1954 }
Al Virod8725c82014-12-11 00:02:50 -05001955 err = sock_sendmsg(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001956 /*
1957 * If this is sendmmsg() and sending to current destination address was
1958 * successful, remember it.
1959 */
1960 if (used_address && err >= 0) {
1961 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07001962 if (msg_sys->msg_name)
1963 memcpy(&used_address->name, msg_sys->msg_name,
1964 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001965 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001966
1967out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001968 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1970out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04001971 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00001972 return err;
1973}
1974
1975/*
1976 * BSD sendmsg interface
1977 */
1978
Al Viro666547f2014-04-06 14:03:05 -04001979long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
Anton Blanchard228e5482011-05-02 20:21:35 +00001980{
1981 int fput_needed, err;
1982 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07001983 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00001984
Andy Lutomirski1be374a2013-05-22 14:07:44 -07001985 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00001986 if (!sock)
1987 goto out;
1988
Tom Herbert28a94d82016-03-07 14:11:02 -08001989 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
Anton Blanchard228e5482011-05-02 20:21:35 +00001990
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001991 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001992out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993 return err;
1994}
1995
Al Viro666547f2014-04-06 14:03:05 -04001996SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00001997{
1998 if (flags & MSG_CMSG_COMPAT)
1999 return -EINVAL;
2000 return __sys_sendmsg(fd, msg, flags);
2001}
2002
Anton Blanchard228e5482011-05-02 20:21:35 +00002003/*
2004 * Linux sendmmsg interface
2005 */
2006
2007int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2008 unsigned int flags)
2009{
2010 int fput_needed, err, datagrams;
2011 struct socket *sock;
2012 struct mmsghdr __user *entry;
2013 struct compat_mmsghdr __user *compat_entry;
2014 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002015 struct used_address used_address;
Tom Herbertf0922762016-03-07 14:11:03 -08002016 unsigned int oflags = flags;
Anton Blanchard228e5482011-05-02 20:21:35 +00002017
Anton Blanchard98382f42011-08-04 14:07:39 +00002018 if (vlen > UIO_MAXIOV)
2019 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002020
2021 datagrams = 0;
2022
2023 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2024 if (!sock)
2025 return err;
2026
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002027 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002028 entry = mmsg;
2029 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002030 err = 0;
Tom Herbertf0922762016-03-07 14:11:03 -08002031 flags |= MSG_BATCH;
Anton Blanchard228e5482011-05-02 20:21:35 +00002032
2033 while (datagrams < vlen) {
Tom Herbertf0922762016-03-07 14:11:03 -08002034 if (datagrams == vlen - 1)
2035 flags = oflags;
2036
Anton Blanchard228e5482011-05-02 20:21:35 +00002037 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002038 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002039 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002040 if (err < 0)
2041 break;
2042 err = __put_user(err, &compat_entry->msg_len);
2043 ++compat_entry;
2044 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002045 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002046 (struct user_msghdr __user *)entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002047 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002048 if (err < 0)
2049 break;
2050 err = put_user(err, &entry->msg_len);
2051 ++entry;
2052 }
2053
2054 if (err)
2055 break;
2056 ++datagrams;
Soheil Hassas Yeganeh30238982016-11-04 15:36:49 -04002057 if (msg_data_left(&msg_sys))
2058 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002059 cond_resched();
Anton Blanchard228e5482011-05-02 20:21:35 +00002060 }
2061
Anton Blanchard228e5482011-05-02 20:21:35 +00002062 fput_light(sock->file, fput_needed);
2063
Anton Blanchard728ffb82011-08-04 14:07:38 +00002064 /* We only return an error if no datagrams were able to be sent */
2065 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002066 return datagrams;
2067
Anton Blanchard228e5482011-05-02 20:21:35 +00002068 return err;
2069}
2070
2071SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2072 unsigned int, vlen, unsigned int, flags)
2073{
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002074 if (flags & MSG_CMSG_COMPAT)
2075 return -EINVAL;
Anton Blanchard228e5482011-05-02 20:21:35 +00002076 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2077}
2078
Al Viro666547f2014-04-06 14:03:05 -04002079static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002080 struct msghdr *msg_sys, unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002082 struct compat_msghdr __user *msg_compat =
2083 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002085 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002086 unsigned long cmsg_ptr;
Al Viro2da62902015-03-14 21:13:46 -04002087 int len;
Al Viro08adb7d2014-11-10 20:23:13 -05002088 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089
2090 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002091 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092
2093 /* user mode address pointers */
2094 struct sockaddr __user *uaddr;
Al Viro08adb7d2014-11-10 20:23:13 -05002095 int __user *uaddr_len = COMPAT_NAMELEN(msg);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002096
Al Viro08adb7d2014-11-10 20:23:13 -05002097 msg_sys->msg_name = &addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002099 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002100 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002101 else
Al Viro08adb7d2014-11-10 20:23:13 -05002102 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04002104 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002106 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2107 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002108
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002109 /* We assume all kernel code knows the size of sockaddr_storage */
2110 msg_sys->msg_namelen = 0;
2111
Linus Torvalds1da177e2005-04-16 15:20:36 -07002112 if (sock->file->f_flags & O_NONBLOCK)
2113 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002114 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115 if (err < 0)
2116 goto out_freeiov;
2117 len = err;
2118
2119 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002120 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002121 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002122 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002123 if (err < 0)
2124 goto out_freeiov;
2125 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002126 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002127 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002128 if (err)
2129 goto out_freeiov;
2130 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002131 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002132 &msg_compat->msg_controllen);
2133 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002134 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135 &msg->msg_controllen);
2136 if (err)
2137 goto out_freeiov;
2138 err = len;
2139
2140out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04002141 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002142 return err;
2143}
2144
2145/*
2146 * BSD recvmsg interface
2147 */
2148
Al Viro666547f2014-04-06 14:03:05 -04002149long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002150{
2151 int fput_needed, err;
2152 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002153 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002154
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002155 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002156 if (!sock)
2157 goto out;
2158
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002159 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002160
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002161 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002162out:
2163 return err;
2164}
2165
Al Viro666547f2014-04-06 14:03:05 -04002166SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002167 unsigned int, flags)
2168{
2169 if (flags & MSG_CMSG_COMPAT)
2170 return -EINVAL;
2171 return __sys_recvmsg(fd, msg, flags);
2172}
2173
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002174/*
2175 * Linux recvmmsg interface
2176 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002178int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2179 unsigned int flags, struct timespec *timeout)
2180{
2181 int fput_needed, err, datagrams;
2182 struct socket *sock;
2183 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002184 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002185 struct msghdr msg_sys;
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002186 struct timespec64 end_time;
2187 struct timespec64 timeout64;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002188
2189 if (timeout &&
2190 poll_select_set_timeout(&end_time, timeout->tv_sec,
2191 timeout->tv_nsec))
2192 return -EINVAL;
2193
2194 datagrams = 0;
2195
2196 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2197 if (!sock)
2198 return err;
2199
2200 err = sock_error(sock->sk);
Maxime Jayat1a0e2592017-02-21 18:35:51 +01002201 if (err) {
2202 datagrams = err;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002203 goto out_put;
Maxime Jayat1a0e2592017-02-21 18:35:51 +01002204 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002205
2206 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002207 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002208
2209 while (datagrams < vlen) {
2210 /*
2211 * No need to ask LSM for more than the first datagram.
2212 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002213 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002214 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002215 &msg_sys, flags & ~MSG_WAITFORONE,
2216 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002217 if (err < 0)
2218 break;
2219 err = __put_user(err, &compat_entry->msg_len);
2220 ++compat_entry;
2221 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002222 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002223 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002224 &msg_sys, flags & ~MSG_WAITFORONE,
2225 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002226 if (err < 0)
2227 break;
2228 err = put_user(err, &entry->msg_len);
2229 ++entry;
2230 }
2231
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002232 if (err)
2233 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002234 ++datagrams;
2235
Brandon L Black71c5c152010-03-26 16:18:03 +00002236 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2237 if (flags & MSG_WAITFORONE)
2238 flags |= MSG_DONTWAIT;
2239
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002240 if (timeout) {
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002241 ktime_get_ts64(&timeout64);
2242 *timeout = timespec64_to_timespec(
2243 timespec64_sub(end_time, timeout64));
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002244 if (timeout->tv_sec < 0) {
2245 timeout->tv_sec = timeout->tv_nsec = 0;
2246 break;
2247 }
2248
2249 /* Timeout, return less than vlen datagrams */
2250 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2251 break;
2252 }
2253
2254 /* Out of band data, return right away */
2255 if (msg_sys.msg_flags & MSG_OOB)
2256 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002257 cond_resched();
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002258 }
2259
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002260 if (err == 0)
2261 goto out_put;
2262
2263 if (datagrams == 0) {
2264 datagrams = err;
2265 goto out_put;
2266 }
2267
2268 /*
2269 * We may return less entries than requested (vlen) if the
2270 * sock is non block and there aren't enough datagrams...
2271 */
2272 if (err != -EAGAIN) {
2273 /*
2274 * ... or if recvmsg returns an error after we
2275 * received some datagrams, where we record the
2276 * error to return on the next call or if the
2277 * app asks about it using getsockopt(SO_ERROR).
2278 */
2279 sock->sk->sk_err = -err;
2280 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002281out_put:
2282 fput_light(sock->file, fput_needed);
2283
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002284 return datagrams;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002285}
2286
2287SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2288 unsigned int, vlen, unsigned int, flags,
2289 struct timespec __user *, timeout)
2290{
2291 int datagrams;
2292 struct timespec timeout_sys;
2293
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002294 if (flags & MSG_CMSG_COMPAT)
2295 return -EINVAL;
2296
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002297 if (!timeout)
2298 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2299
2300 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2301 return -EFAULT;
2302
2303 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2304
2305 if (datagrams > 0 &&
2306 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2307 datagrams = -EFAULT;
2308
2309 return datagrams;
2310}
2311
2312#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313/* Argument list sizes for sys_socketcall */
2314#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002315static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002316 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2317 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2318 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002319 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002320};
2321
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322#undef AL
2323
2324/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002325 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002326 *
2327 * Argument checking cleaned up. Saved 20% in size.
2328 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002329 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002330 */
2331
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002332SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002333{
Chen Gang2950fa92013-04-07 16:55:23 +08002334 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002335 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002336 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002337 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338
Anton Blanchard228e5482011-05-02 20:21:35 +00002339 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340 return -EINVAL;
2341
Arjan van de Ven47379052009-09-28 12:57:44 -07002342 len = nargs[call];
2343 if (len > sizeof(a))
2344 return -EINVAL;
2345
Linus Torvalds1da177e2005-04-16 15:20:36 -07002346 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002347 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002349
Chen Gang2950fa92013-04-07 16:55:23 +08002350 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2351 if (err)
2352 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002353
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002354 a0 = a[0];
2355 a1 = a[1];
2356
2357 switch (call) {
2358 case SYS_SOCKET:
2359 err = sys_socket(a0, a1, a[2]);
2360 break;
2361 case SYS_BIND:
2362 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2363 break;
2364 case SYS_CONNECT:
2365 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2366 break;
2367 case SYS_LISTEN:
2368 err = sys_listen(a0, a1);
2369 break;
2370 case SYS_ACCEPT:
Ulrich Drepperde11def2008-11-19 15:36:14 -08002371 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2372 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002373 break;
2374 case SYS_GETSOCKNAME:
2375 err =
2376 sys_getsockname(a0, (struct sockaddr __user *)a1,
2377 (int __user *)a[2]);
2378 break;
2379 case SYS_GETPEERNAME:
2380 err =
2381 sys_getpeername(a0, (struct sockaddr __user *)a1,
2382 (int __user *)a[2]);
2383 break;
2384 case SYS_SOCKETPAIR:
2385 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2386 break;
2387 case SYS_SEND:
2388 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2389 break;
2390 case SYS_SENDTO:
2391 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2392 (struct sockaddr __user *)a[4], a[5]);
2393 break;
2394 case SYS_RECV:
2395 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2396 break;
2397 case SYS_RECVFROM:
2398 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2399 (struct sockaddr __user *)a[4],
2400 (int __user *)a[5]);
2401 break;
2402 case SYS_SHUTDOWN:
2403 err = sys_shutdown(a0, a1);
2404 break;
2405 case SYS_SETSOCKOPT:
2406 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2407 break;
2408 case SYS_GETSOCKOPT:
2409 err =
2410 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2411 (int __user *)a[4]);
2412 break;
2413 case SYS_SENDMSG:
Al Viro666547f2014-04-06 14:03:05 -04002414 err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002415 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002416 case SYS_SENDMMSG:
2417 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2418 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002419 case SYS_RECVMSG:
Al Viro666547f2014-04-06 14:03:05 -04002420 err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002421 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002422 case SYS_RECVMMSG:
2423 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2424 (struct timespec __user *)a[4]);
2425 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002426 case SYS_ACCEPT4:
2427 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2428 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002429 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002430 default:
2431 err = -EINVAL;
2432 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002433 }
2434 return err;
2435}
2436
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002437#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002438
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002439/**
2440 * sock_register - add a socket protocol handler
2441 * @ops: description of protocol
2442 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002443 * This function is called by a protocol handler that wants to
2444 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09002445 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002446 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002447 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002448int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449{
2450 int err;
2451
2452 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08002453 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002454 return -ENOBUFS;
2455 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002456
2457 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002458 if (rcu_dereference_protected(net_families[ops->family],
2459 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002460 err = -EEXIST;
2461 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00002462 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002463 err = 0;
2464 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002465 spin_unlock(&net_family_lock);
2466
Yang Yingliang3410f222014-02-12 17:09:55 +08002467 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002468 return err;
2469}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002470EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002471
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002472/**
2473 * sock_unregister - remove a protocol handler
2474 * @family: protocol family to remove
2475 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002476 * This function is called by a protocol handler that wants to
2477 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002478 * new socket creation.
2479 *
2480 * If protocol handler is a module, then it can use module reference
2481 * counts to protect against new references. If protocol handler is not
2482 * a module then it needs to provide its own protection in
2483 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002484 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002485void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002486{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002487 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002488
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002489 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00002490 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002491 spin_unlock(&net_family_lock);
2492
2493 synchronize_rcu();
2494
Yang Yingliang3410f222014-02-12 17:09:55 +08002495 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002496}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002497EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002498
Andi Kleen77d76ea2005-12-22 12:43:42 -08002499static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002500{
Nick Pigginb3e19d92011-01-07 17:50:11 +11002501 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00002502 /*
2503 * Initialize the network sysctl infrastructure.
2504 */
2505 err = net_sysctl_init();
2506 if (err)
2507 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11002508
Linus Torvalds1da177e2005-04-16 15:20:36 -07002509 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002510 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002511 */
2512 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002513
2514 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002515 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002516 */
2517
2518 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11002519
2520 err = register_filesystem(&sock_fs_type);
2521 if (err)
2522 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002523 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11002524 if (IS_ERR(sock_mnt)) {
2525 err = PTR_ERR(sock_mnt);
2526 goto out_mount;
2527 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08002528
2529 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002530 */
2531
2532#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00002533 err = netfilter_init();
2534 if (err)
2535 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002536#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002537
Daniel Borkmann408eccc2014-04-01 16:20:23 +02002538 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00002539
Nick Pigginb3e19d92011-01-07 17:50:11 +11002540out:
2541 return err;
2542
2543out_mount:
2544 unregister_filesystem(&sock_fs_type);
2545out_fs:
2546 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002547}
2548
Andi Kleen77d76ea2005-12-22 12:43:42 -08002549core_initcall(sock_init); /* early initcall */
2550
Alexei Starovoitova3d6dd62018-01-29 02:48:56 +01002551static int __init jit_init(void)
2552{
2553#ifdef CONFIG_BPF_JIT_ALWAYS_ON
2554 bpf_jit_enable = 1;
2555#endif
2556 return 0;
2557}
2558pure_initcall(jit_init);
2559
Linus Torvalds1da177e2005-04-16 15:20:36 -07002560#ifdef CONFIG_PROC_FS
2561void socket_seq_show(struct seq_file *seq)
2562{
2563 int cpu;
2564 int counter = 0;
2565
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07002566 for_each_possible_cpu(cpu)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002567 counter += per_cpu(sockets_in_use, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002568
2569 /* It can be negative, by the way. 8) */
2570 if (counter < 0)
2571 counter = 0;
2572
2573 seq_printf(seq, "sockets: used %d\n", counter);
2574}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002575#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002576
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002577#ifdef CONFIG_COMPAT
Arnd Bergmann6b960182009-11-06 23:10:54 -08002578static int do_siocgstamp(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002579 unsigned int cmd, void __user *up)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002580{
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002581 mm_segment_t old_fs = get_fs();
2582 struct timeval ktv;
2583 int err;
2584
2585 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002586 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002587 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002588 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002589 err = compat_put_timeval(&ktv, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002590
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002591 return err;
2592}
2593
Arnd Bergmann6b960182009-11-06 23:10:54 -08002594static int do_siocgstampns(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002595 unsigned int cmd, void __user *up)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002596{
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002597 mm_segment_t old_fs = get_fs();
2598 struct timespec kts;
2599 int err;
2600
2601 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002602 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002603 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002604 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002605 err = compat_put_timespec(&kts, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002606
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002607 return err;
2608}
2609
Arnd Bergmann6b960182009-11-06 23:10:54 -08002610static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002611{
2612 struct ifreq __user *uifr;
2613 int err;
2614
2615 uifr = compat_alloc_user_space(sizeof(struct ifreq));
Arnd Bergmann6b960182009-11-06 23:10:54 -08002616 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002617 return -EFAULT;
2618
Arnd Bergmann6b960182009-11-06 23:10:54 -08002619 err = dev_ioctl(net, SIOCGIFNAME, uifr);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002620 if (err)
2621 return err;
2622
Arnd Bergmann6b960182009-11-06 23:10:54 -08002623 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002624 return -EFAULT;
2625
2626 return 0;
2627}
2628
Arnd Bergmann6b960182009-11-06 23:10:54 -08002629static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002630{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002631 struct compat_ifconf ifc32;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002632 struct ifconf ifc;
2633 struct ifconf __user *uifc;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002634 struct compat_ifreq __user *ifr32;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002635 struct ifreq __user *ifr;
2636 unsigned int i, j;
2637 int err;
2638
Arnd Bergmann6b960182009-11-06 23:10:54 -08002639 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002640 return -EFAULT;
2641
Mathias Krause43da5f22012-08-15 11:31:57 +00002642 memset(&ifc, 0, sizeof(ifc));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002643 if (ifc32.ifcbuf == 0) {
2644 ifc32.ifc_len = 0;
2645 ifc.ifc_len = 0;
2646 ifc.ifc_req = NULL;
2647 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2648 } else {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002649 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2650 sizeof(struct ifreq);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002651 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2652 ifc.ifc_len = len;
2653 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2654 ifr32 = compat_ptr(ifc32.ifcbuf);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002655 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
Arnd Bergmann6b960182009-11-06 23:10:54 -08002656 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002657 return -EFAULT;
2658 ifr++;
2659 ifr32++;
2660 }
2661 }
2662 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2663 return -EFAULT;
2664
Arnd Bergmann6b960182009-11-06 23:10:54 -08002665 err = dev_ioctl(net, SIOCGIFCONF, uifc);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002666 if (err)
2667 return err;
2668
2669 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2670 return -EFAULT;
2671
2672 ifr = ifc.ifc_req;
2673 ifr32 = compat_ptr(ifc32.ifcbuf);
2674 for (i = 0, j = 0;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002675 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2676 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2677 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002678 return -EFAULT;
2679 ifr32++;
2680 ifr++;
2681 }
2682
2683 if (ifc32.ifcbuf == 0) {
2684 /* Translate from 64-bit structure multiple to
2685 * a 32-bit one.
2686 */
2687 i = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002688 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002689 ifc32.ifc_len = i;
2690 } else {
2691 ifc32.ifc_len = i;
2692 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08002693 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002694 return -EFAULT;
2695
2696 return 0;
2697}
2698
Arnd Bergmann6b960182009-11-06 23:10:54 -08002699static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002700{
Ben Hutchings3a7da392011-03-17 07:34:32 +00002701 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2702 bool convert_in = false, convert_out = false;
2703 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2704 struct ethtool_rxnfc __user *rxnfc;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002705 struct ifreq __user *ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002706 u32 rule_cnt = 0, actual_rule_cnt;
2707 u32 ethcmd;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002708 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002709 int ret;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002710
2711 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2712 return -EFAULT;
2713
Ben Hutchings3a7da392011-03-17 07:34:32 +00002714 compat_rxnfc = compat_ptr(data);
2715
2716 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002717 return -EFAULT;
2718
Ben Hutchings3a7da392011-03-17 07:34:32 +00002719 /* Most ethtool structures are defined without padding.
2720 * Unfortunately struct ethtool_rxnfc is an exception.
2721 */
2722 switch (ethcmd) {
2723 default:
2724 break;
2725 case ETHTOOL_GRXCLSRLALL:
2726 /* Buffer size is variable */
2727 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2728 return -EFAULT;
2729 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2730 return -ENOMEM;
2731 buf_size += rule_cnt * sizeof(u32);
2732 /* fall through */
2733 case ETHTOOL_GRXRINGS:
2734 case ETHTOOL_GRXCLSRLCNT:
2735 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00002736 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002737 convert_out = true;
2738 /* fall through */
2739 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002740 buf_size += sizeof(struct ethtool_rxnfc);
2741 convert_in = true;
2742 break;
2743 }
2744
2745 ifr = compat_alloc_user_space(buf_size);
Stephen Hemminger954b1242013-02-11 06:22:28 +00002746 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
Ben Hutchings3a7da392011-03-17 07:34:32 +00002747
2748 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2749 return -EFAULT;
2750
2751 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2752 &ifr->ifr_ifru.ifru_data))
2753 return -EFAULT;
2754
2755 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00002756 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00002757 * fs.ring_cookie and at the end of fs, but nowhere else.
2758 */
Alexander Duyck127fe532011-04-08 18:01:59 +00002759 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2760 sizeof(compat_rxnfc->fs.m_ext) !=
2761 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2762 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00002763 BUILD_BUG_ON(
2764 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2765 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2766 offsetof(struct ethtool_rxnfc, fs.location) -
2767 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2768
2769 if (copy_in_user(rxnfc, compat_rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002770 (void __user *)(&rxnfc->fs.m_ext + 1) -
2771 (void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002772 copy_in_user(&rxnfc->fs.ring_cookie,
2773 &compat_rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002774 (void __user *)(&rxnfc->fs.location + 1) -
2775 (void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002776 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2777 sizeof(rxnfc->rule_cnt)))
2778 return -EFAULT;
2779 }
2780
2781 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2782 if (ret)
2783 return ret;
2784
2785 if (convert_out) {
2786 if (copy_in_user(compat_rxnfc, rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002787 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2788 (const void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002789 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2790 &rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002791 (const void __user *)(&rxnfc->fs.location + 1) -
2792 (const void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002793 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2794 sizeof(rxnfc->rule_cnt)))
2795 return -EFAULT;
2796
2797 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2798 /* As an optimisation, we only copy the actual
2799 * number of rules that the underlying
2800 * function returned. Since Mallory might
2801 * change the rule count in user memory, we
2802 * check that it is less than the rule count
2803 * originally given (as the user buffer size),
2804 * which has been range-checked.
2805 */
2806 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2807 return -EFAULT;
2808 if (actual_rule_cnt < rule_cnt)
2809 rule_cnt = actual_rule_cnt;
2810 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2811 &rxnfc->rule_locs[0],
2812 rule_cnt * sizeof(u32)))
2813 return -EFAULT;
2814 }
2815 }
2816
2817 return 0;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002818}
2819
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002820static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2821{
2822 void __user *uptr;
2823 compat_uptr_t uptr32;
2824 struct ifreq __user *uifr;
2825
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002826 uifr = compat_alloc_user_space(sizeof(*uifr));
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002827 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2828 return -EFAULT;
2829
2830 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2831 return -EFAULT;
2832
2833 uptr = compat_ptr(uptr32);
2834
2835 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2836 return -EFAULT;
2837
2838 return dev_ioctl(net, SIOCWANDEV, uifr);
2839}
2840
Arnd Bergmann6b960182009-11-06 23:10:54 -08002841static int bond_ioctl(struct net *net, unsigned int cmd,
2842 struct compat_ifreq __user *ifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002843{
2844 struct ifreq kifr;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002845 mm_segment_t old_fs;
2846 int err;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002847
2848 switch (cmd) {
2849 case SIOCBONDENSLAVE:
2850 case SIOCBONDRELEASE:
2851 case SIOCBONDSETHWADDR:
2852 case SIOCBONDCHANGEACTIVE:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002853 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002854 return -EFAULT;
2855
2856 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002857 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002858 err = dev_ioctl(net, cmd,
2859 (struct ifreq __user __force *) &kifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002860 set_fs(old_fs);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002861
2862 return err;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002863 default:
Linus Torvalds07d106d2012-01-05 15:40:12 -08002864 return -ENOIOCTLCMD;
Joe Perchesccbd6a52010-05-14 10:58:26 +00002865 }
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002866}
2867
Ben Hutchings590d4692013-11-18 17:04:13 +00002868/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
2869static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08002870 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002871{
2872 struct ifreq __user *u_ifreq64;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002873 char tmp_buf[IFNAMSIZ];
2874 void __user *data64;
2875 u32 data32;
2876
2877 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
2878 IFNAMSIZ))
2879 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00002880 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002881 return -EFAULT;
2882 data64 = compat_ptr(data32);
2883
2884 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
2885
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002886 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
2887 IFNAMSIZ))
2888 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00002889 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002890 return -EFAULT;
2891
Arnd Bergmann6b960182009-11-06 23:10:54 -08002892 return dev_ioctl(net, cmd, u_ifreq64);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002893}
2894
Arnd Bergmann6b960182009-11-06 23:10:54 -08002895static int dev_ifsioc(struct net *net, struct socket *sock,
2896 unsigned int cmd, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002897{
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002898 struct ifreq __user *uifr;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002899 int err;
2900
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002901 uifr = compat_alloc_user_space(sizeof(*uifr));
2902 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
2903 return -EFAULT;
2904
2905 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
2906
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002907 if (!err) {
2908 switch (cmd) {
2909 case SIOCGIFFLAGS:
2910 case SIOCGIFMETRIC:
2911 case SIOCGIFMTU:
2912 case SIOCGIFMEM:
2913 case SIOCGIFHWADDR:
2914 case SIOCGIFINDEX:
2915 case SIOCGIFADDR:
2916 case SIOCGIFBRDADDR:
2917 case SIOCGIFDSTADDR:
2918 case SIOCGIFNETMASK:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002919 case SIOCGIFPFLAGS:
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002920 case SIOCGIFTXQLEN:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002921 case SIOCGMIIPHY:
2922 case SIOCGMIIREG:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002923 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002924 err = -EFAULT;
2925 break;
2926 }
2927 }
2928 return err;
2929}
2930
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002931static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2932 struct compat_ifreq __user *uifr32)
2933{
2934 struct ifreq ifr;
2935 struct compat_ifmap __user *uifmap32;
2936 mm_segment_t old_fs;
2937 int err;
2938
2939 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2940 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002941 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2942 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2943 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2944 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
2945 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
2946 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002947 if (err)
2948 return -EFAULT;
2949
2950 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002951 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002952 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002953 set_fs(old_fs);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002954
2955 if (cmd == SIOCGIFMAP && !err) {
2956 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002957 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2958 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2959 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2960 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
2961 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
2962 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002963 if (err)
2964 err = -EFAULT;
2965 }
2966 return err;
2967}
2968
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002969struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002970 u32 rt_pad1;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002971 struct sockaddr rt_dst; /* target address */
2972 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
2973 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002974 unsigned short rt_flags;
2975 short rt_pad2;
2976 u32 rt_pad3;
2977 unsigned char rt_tos;
2978 unsigned char rt_class;
2979 short rt_pad4;
2980 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002981 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002982 u32 rt_mtu; /* per route MTU/Window */
2983 u32 rt_window; /* Window clamping */
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002984 unsigned short rt_irtt; /* Initial RTT */
2985};
2986
2987struct in6_rtmsg32 {
2988 struct in6_addr rtmsg_dst;
2989 struct in6_addr rtmsg_src;
2990 struct in6_addr rtmsg_gateway;
2991 u32 rtmsg_type;
2992 u16 rtmsg_dst_len;
2993 u16 rtmsg_src_len;
2994 u32 rtmsg_metric;
2995 u32 rtmsg_info;
2996 u32 rtmsg_flags;
2997 s32 rtmsg_ifindex;
2998};
2999
Arnd Bergmann6b960182009-11-06 23:10:54 -08003000static int routing_ioctl(struct net *net, struct socket *sock,
3001 unsigned int cmd, void __user *argp)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003002{
3003 int ret;
3004 void *r = NULL;
3005 struct in6_rtmsg r6;
3006 struct rtentry r4;
3007 char devname[16];
3008 u32 rtdev;
3009 mm_segment_t old_fs = get_fs();
3010
Arnd Bergmann6b960182009-11-06 23:10:54 -08003011 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3012 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003013 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003014 3 * sizeof(struct in6_addr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003015 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3016 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3017 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3018 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3019 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3020 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3021 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003022
3023 r = (void *) &r6;
3024 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003025 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003026 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003027 3 * sizeof(struct sockaddr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003028 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3029 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3030 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3031 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3032 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3033 ret |= get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003034 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003035 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003036 r4.rt_dev = (char __user __force *)devname;
3037 devname[15] = 0;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003038 } else
3039 r4.rt_dev = NULL;
3040
3041 r = (void *) &r4;
3042 }
3043
3044 if (ret) {
3045 ret = -EFAULT;
3046 goto out;
3047 }
3048
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003049 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003050 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003051 set_fs(old_fs);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003052
3053out:
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003054 return ret;
3055}
3056
3057/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3058 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003059 * use compatible ioctls
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003060 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003061static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003062{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003063 compat_ulong_t tmp;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003064
Arnd Bergmann6b960182009-11-06 23:10:54 -08003065 if (get_user(tmp, argp))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003066 return -EFAULT;
3067 if (tmp == BRCTL_GET_VERSION)
3068 return BRCTL_VERSION + 1;
3069 return -EINVAL;
3070}
3071
Arnd Bergmann6b960182009-11-06 23:10:54 -08003072static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3073 unsigned int cmd, unsigned long arg)
3074{
3075 void __user *argp = compat_ptr(arg);
3076 struct sock *sk = sock->sk;
3077 struct net *net = sock_net(sk);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003078
Arnd Bergmann6b960182009-11-06 23:10:54 -08003079 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003080 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003081
Arnd Bergmann6b960182009-11-06 23:10:54 -08003082 switch (cmd) {
3083 case SIOCSIFBR:
3084 case SIOCGIFBR:
3085 return old_bridge_ioctl(argp);
3086 case SIOCGIFNAME:
3087 return dev_ifname32(net, argp);
3088 case SIOCGIFCONF:
3089 return dev_ifconf(net, argp);
3090 case SIOCETHTOOL:
3091 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003092 case SIOCWANDEV:
3093 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003094 case SIOCGIFMAP:
3095 case SIOCSIFMAP:
3096 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003097 case SIOCBONDENSLAVE:
3098 case SIOCBONDRELEASE:
3099 case SIOCBONDSETHWADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003100 case SIOCBONDCHANGEACTIVE:
3101 return bond_ioctl(net, cmd, argp);
3102 case SIOCADDRT:
3103 case SIOCDELRT:
3104 return routing_ioctl(net, sock, cmd, argp);
3105 case SIOCGSTAMP:
3106 return do_siocgstamp(net, sock, cmd, argp);
3107 case SIOCGSTAMPNS:
3108 return do_siocgstampns(net, sock, cmd, argp);
Ben Hutchings590d4692013-11-18 17:04:13 +00003109 case SIOCBONDSLAVEINFOQUERY:
3110 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003111 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003112 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003113 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003114
Arnd Bergmann6b960182009-11-06 23:10:54 -08003115 case FIOSETOWN:
3116 case SIOCSPGRP:
3117 case FIOGETOWN:
3118 case SIOCGPGRP:
3119 case SIOCBRADDBR:
3120 case SIOCBRDELBR:
3121 case SIOCGIFVLAN:
3122 case SIOCSIFVLAN:
3123 case SIOCADDDLCI:
3124 case SIOCDELDLCI:
3125 return sock_ioctl(file, cmd, arg);
3126
3127 case SIOCGIFFLAGS:
3128 case SIOCSIFFLAGS:
3129 case SIOCGIFMETRIC:
3130 case SIOCSIFMETRIC:
3131 case SIOCGIFMTU:
3132 case SIOCSIFMTU:
3133 case SIOCGIFMEM:
3134 case SIOCSIFMEM:
3135 case SIOCGIFHWADDR:
3136 case SIOCSIFHWADDR:
3137 case SIOCADDMULTI:
3138 case SIOCDELMULTI:
3139 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003140 case SIOCGIFADDR:
3141 case SIOCSIFADDR:
3142 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003143 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003144 case SIOCGIFBRDADDR:
3145 case SIOCSIFBRDADDR:
3146 case SIOCGIFDSTADDR:
3147 case SIOCSIFDSTADDR:
3148 case SIOCGIFNETMASK:
3149 case SIOCSIFNETMASK:
3150 case SIOCSIFPFLAGS:
3151 case SIOCGIFPFLAGS:
3152 case SIOCGIFTXQLEN:
3153 case SIOCSIFTXQLEN:
3154 case SIOCBRADDIF:
3155 case SIOCBRDELIF:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003156 case SIOCSIFNAME:
3157 case SIOCGMIIPHY:
3158 case SIOCGMIIREG:
3159 case SIOCSMIIREG:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003160 return dev_ifsioc(net, sock, cmd, argp);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003161
Arnd Bergmann6b960182009-11-06 23:10:54 -08003162 case SIOCSARP:
3163 case SIOCGARP:
3164 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003165 case SIOCATMARK:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003166 return sock_do_ioctl(net, sock, cmd, arg);
3167 }
3168
Arnd Bergmann6b960182009-11-06 23:10:54 -08003169 return -ENOIOCTLCMD;
3170}
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003171
Eric Dumazet95c96172012-04-15 05:58:06 +00003172static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003173 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003174{
3175 struct socket *sock = file->private_data;
3176 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003177 struct sock *sk;
3178 struct net *net;
3179
3180 sk = sock->sk;
3181 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003182
3183 if (sock->ops->compat_ioctl)
3184 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3185
David S. Miller87de87d2008-06-03 09:14:03 -07003186 if (ret == -ENOIOCTLCMD &&
3187 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3188 ret = compat_wext_handle_ioctl(net, cmd, arg);
3189
Arnd Bergmann6b960182009-11-06 23:10:54 -08003190 if (ret == -ENOIOCTLCMD)
3191 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3192
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003193 return ret;
3194}
3195#endif
3196
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003197int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3198{
3199 return sock->ops->bind(sock, addr, addrlen);
3200}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003201EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003202
3203int kernel_listen(struct socket *sock, int backlog)
3204{
3205 return sock->ops->listen(sock, backlog);
3206}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003207EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003208
3209int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3210{
3211 struct sock *sk = sock->sk;
3212 int err;
3213
3214 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3215 newsock);
3216 if (err < 0)
3217 goto done;
3218
3219 err = sock->ops->accept(sock, *newsock, flags);
3220 if (err < 0) {
3221 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003222 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003223 goto done;
3224 }
3225
3226 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003227 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003228
3229done:
3230 return err;
3231}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003232EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003233
3234int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003235 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003236{
3237 return sock->ops->connect(sock, addr, addrlen, flags);
3238}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003239EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003240
3241int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3242 int *addrlen)
3243{
3244 return sock->ops->getname(sock, addr, addrlen, 0);
3245}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003246EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003247
3248int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3249 int *addrlen)
3250{
3251 return sock->ops->getname(sock, addr, addrlen, 1);
3252}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003253EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003254
3255int kernel_getsockopt(struct socket *sock, int level, int optname,
3256 char *optval, int *optlen)
3257{
3258 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003259 char __user *uoptval;
3260 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003261 int err;
3262
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003263 uoptval = (char __user __force *) optval;
3264 uoptlen = (int __user __force *) optlen;
3265
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003266 set_fs(KERNEL_DS);
3267 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003268 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003269 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003270 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3271 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003272 set_fs(oldfs);
3273 return err;
3274}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003275EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003276
3277int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003278 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003279{
3280 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003281 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003282 int err;
3283
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003284 uoptval = (char __user __force *) optval;
3285
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003286 set_fs(KERNEL_DS);
3287 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003288 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003289 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003290 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003291 optlen);
3292 set_fs(oldfs);
3293 return err;
3294}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003295EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003296
3297int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3298 size_t size, int flags)
3299{
3300 if (sock->ops->sendpage)
3301 return sock->ops->sendpage(sock, page, offset, size, flags);
3302
3303 return sock_no_sendpage(sock, page, offset, size, flags);
3304}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003305EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003306
3307int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3308{
3309 mm_segment_t oldfs = get_fs();
3310 int err;
3311
3312 set_fs(KERNEL_DS);
3313 err = sock->ops->ioctl(sock, cmd, arg);
3314 set_fs(oldfs);
3315
3316 return err;
3317}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003318EXPORT_SYMBOL(kernel_sock_ioctl);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003319
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003320int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3321{
3322 return sock->ops->shutdown(sock, how);
3323}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003324EXPORT_SYMBOL(kernel_sock_shutdown);