blob: 5a9bf5ee2464da20fbb42ea6699b29318553e210 [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
344static const struct xattr_handler *sockfs_xattr_handlers[] = {
345 &sockfs_xattr_handler,
346 NULL
347};
348
Al Viroc74a1cb2011-01-12 16:59:34 -0500349static struct dentry *sockfs_mount(struct file_system_type *fs_type,
350 int flags, const char *dev_name, void *data)
351{
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200352 return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops,
353 sockfs_xattr_handlers,
354 &sockfs_dentry_operations, SOCKFS_MAGIC);
Al Viroc74a1cb2011-01-12 16:59:34 -0500355}
356
357static struct vfsmount *sock_mnt __read_mostly;
358
359static struct file_system_type sock_fs_type = {
360 .name = "sockfs",
361 .mount = sockfs_mount,
362 .kill_sb = kill_anon_super,
363};
364
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365/*
366 * Obtains the first available file descriptor and sets it up for use.
367 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800368 * These functions create file structures and maps them to fd space
369 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 * and file struct implicitly stored in sock->file.
371 * Note that another thread may close file descriptor before we return
372 * from this function. We use the fact that now we do not refer
373 * to socket after mapping. If one day we will need it, this
374 * function will increment ref. count on file by 1.
375 *
376 * In any case returned fd MAY BE not valid!
377 * This race condition is unavoidable
378 * with shared fd spaces, we cannot solve it inside kernel,
379 * but we take care of internal coherence yet.
380 */
381
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700382struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
Al Viro7cbe66b2009-08-05 19:59:08 +0400384 struct qstr name = { .name = "" };
Al Viro2c48b9c2009-08-09 00:52:35 +0400385 struct path path;
Al Viro7cbe66b2009-08-05 19:59:08 +0400386 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800387
Masatake YAMATO600e1772012-08-29 10:44:29 +0000388 if (dname) {
389 name.name = dname;
390 name.len = strlen(name.name);
391 } else if (sock->sk) {
392 name.name = sock->sk->sk_prot_creator->name;
393 name.len = strlen(name.name);
394 }
Nick Piggin4b936882011-01-07 17:50:07 +1100395 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
Al Viro28407632012-08-17 23:54:15 -0400396 if (unlikely(!path.dentry))
397 return ERR_PTR(-ENOMEM);
Al Viro2c48b9c2009-08-09 00:52:35 +0400398 path.mnt = mntget(sock_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
Al Viro2c48b9c2009-08-09 00:52:35 +0400400 d_instantiate(path.dentry, SOCK_INODE(sock));
Al Virocc3808f2009-08-06 09:43:59 +0400401
Al Viro2c48b9c2009-08-09 00:52:35 +0400402 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
Al Virocc3808f2009-08-06 09:43:59 +0400403 &socket_file_ops);
Viresh Kumarb5ffe632015-08-12 15:59:47 +0530404 if (IS_ERR(file)) {
Al Virocc3808f2009-08-06 09:43:59 +0400405 /* drop dentry, keep inode */
David Howellsc5ef6032015-03-17 22:26:16 +0000406 ihold(d_inode(path.dentry));
Al Viro2c48b9c2009-08-09 00:52:35 +0400407 path_put(&path);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700408 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400409 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800410
411 sock->file = file;
Ulrich Drepper77d27202008-07-23 21:29:35 -0700412 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800413 file->private_data = sock;
Al Viro28407632012-08-17 23:54:15 -0400414 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800415}
Al Viro56b31d12012-08-18 00:25:51 -0400416EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800417
Al Viro56b31d12012-08-18 00:25:51 -0400418static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800419{
420 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400421 int fd = get_unused_fd_flags(flags);
422 if (unlikely(fd < 0))
423 return fd;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800424
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700425 newfile = sock_alloc_file(sock, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -0400426 if (likely(!IS_ERR(newfile))) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800427 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400428 return fd;
429 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400430
Al Viro28407632012-08-17 23:54:15 -0400431 put_unused_fd(fd);
432 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433}
434
John Fastabend406a3c62012-07-20 10:39:25 +0000435struct socket *sock_from_file(struct file *file, int *err)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800436{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800437 if (file->f_op == &socket_file_ops)
438 return file->private_data; /* set in sock_map_fd */
439
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800440 *err = -ENOTSOCK;
441 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800442}
John Fastabend406a3c62012-07-20 10:39:25 +0000443EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700446 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 * @fd: file handle
448 * @err: pointer to an error code return
449 *
450 * The file handle passed in is locked and the socket it is bound
451 * too is returned. If an error occurs the err pointer is overwritten
452 * with a negative errno code and NULL is returned. The function checks
453 * for both invalid handles and passing a handle which is not a socket.
454 *
455 * On a success the socket object pointer is returned.
456 */
457
458struct socket *sockfd_lookup(int fd, int *err)
459{
460 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 struct socket *sock;
462
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700463 file = fget(fd);
464 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 *err = -EBADF;
466 return NULL;
467 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700468
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800469 sock = sock_from_file(file, err);
470 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 return sock;
473}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700474EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800476static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
477{
Al Viro00e188e2014-03-03 23:48:18 -0500478 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800479 struct socket *sock;
480
Hua Zhong36725582006-04-19 15:25:02 -0700481 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500482 if (f.file) {
483 sock = sock_from_file(f.file, err);
484 if (likely(sock)) {
485 *fput_needed = f.flags;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800486 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500487 }
488 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800489 }
490 return NULL;
491}
492
Masatake YAMATO600e1772012-08-29 10:44:29 +0000493static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
494 size_t size)
495{
496 ssize_t len;
497 ssize_t used = 0;
498
David Howellsc5ef6032015-03-17 22:26:16 +0000499 len = security_inode_listsecurity(d_inode(dentry), buffer, size);
Masatake YAMATO600e1772012-08-29 10:44:29 +0000500 if (len < 0)
501 return len;
502 used += len;
503 if (buffer) {
504 if (size < used)
505 return -ERANGE;
506 buffer += len;
507 }
508
509 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
510 used += len;
511 if (buffer) {
512 if (size < used)
513 return -ERANGE;
514 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
515 buffer += len;
516 }
517
518 return used;
519}
520
521static const struct inode_operations sockfs_inode_ops = {
Masatake YAMATO600e1772012-08-29 10:44:29 +0000522 .listxattr = sockfs_listxattr,
523};
524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525/**
526 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700527 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 * Allocate a new inode and socket object. The two are bound together
529 * and initialised. The socket is then returned. If we are out of inodes
530 * NULL is returned.
531 */
532
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800533struct socket *sock_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700535 struct inode *inode;
536 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200538 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 if (!inode)
540 return NULL;
541
542 sock = SOCKET_I(inode);
543
Eric Dumazet29a020d2009-09-15 02:39:20 -0700544 kmemcheck_annotate_bitfield(sock, type);
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400545 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700546 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100547 inode->i_uid = current_fsuid();
548 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000549 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
Alex Shi19e8d692012-05-14 14:15:31 -0700551 this_cpu_add(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 return sock;
553}
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800554EXPORT_SYMBOL(sock_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556/**
557 * sock_release - close a socket
558 * @sock: socket to close
559 *
560 * The socket is released from the protocol stack if it has a release
561 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700562 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700564
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565void sock_release(struct socket *sock)
566{
567 if (sock->ops) {
568 struct module *owner = sock->ops->owner;
569
570 sock->ops->release(sock);
571 sock->ops = NULL;
572 module_put(owner);
573 }
574
Eric Dumazeteaefd112011-02-18 03:26:36 +0000575 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800576 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
Alex Shi19e8d692012-05-14 14:15:31 -0700578 this_cpu_sub(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 if (!sock->file) {
580 iput(SOCK_INODE(sock));
581 return;
582 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700583 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700585EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400587void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000588{
Eric Dumazet140c55d2014-08-06 11:49:29 +0200589 u8 flags = *tx_flags;
590
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400591 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200592 flags |= SKBTX_HW_TSTAMP;
593
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400594 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200595 flags |= SKBTX_SW_TSTAMP;
596
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400597 if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200598 flags |= SKBTX_SCHED_TSTAMP;
599
Eric Dumazet140c55d2014-08-06 11:49:29 +0200600 *tx_flags = flags;
Patrick Ohly20d49472009-02-12 05:03:38 +0000601}
Willem de Bruijn67cc0d42014-09-08 19:58:58 -0400602EXPORT_SYMBOL(__sock_tx_timestamp);
Patrick Ohly20d49472009-02-12 05:03:38 +0000603
Al Virod8725c82014-12-11 00:02:50 -0500604static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605{
Al Viro01e97e62014-12-15 21:39:31 -0500606 int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg));
Al Virod8725c82014-12-11 00:02:50 -0500607 BUG_ON(ret == -EIOCBQUEUED);
608 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609}
Gu Zheng0cf00c62014-12-05 15:14:23 +0800610
Al Virod8725c82014-12-11 00:02:50 -0500611int sock_sendmsg(struct socket *sock, struct msghdr *msg)
Gu Zheng0cf00c62014-12-05 15:14:23 +0800612{
Al Virod8725c82014-12-11 00:02:50 -0500613 int err = security_socket_sendmsg(sock, msg,
Al Viro01e97e62014-12-15 21:39:31 -0500614 msg_data_left(msg));
Ying Xue1b784142015-03-02 15:37:48 +0800615
Al Virod8725c82014-12-11 00:02:50 -0500616 return err ?: sock_sendmsg_nosec(sock, msg);
Gu Zheng0cf00c62014-12-05 15:14:23 +0800617}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700618EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
620int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
621 struct kvec *vec, size_t num, size_t size)
622{
Al Viro6aa24812015-03-21 19:56:16 -0400623 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size);
Al Virod8725c82014-12-11 00:02:50 -0500624 return sock_sendmsg(sock, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700626EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700628/*
629 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
630 */
631void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
632 struct sk_buff *skb)
633{
Patrick Ohly20d49472009-02-12 05:03:38 +0000634 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400635 struct scm_timestamping tss;
Patrick Ohly20d49472009-02-12 05:03:38 +0000636 int empty = 1;
637 struct skb_shared_hwtstamps *shhwtstamps =
638 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700639
Patrick Ohly20d49472009-02-12 05:03:38 +0000640 /* Race occurred between timestamp enabling and packet
641 receiving. Fill in the current time for now. */
642 if (need_software_tstamp && skb->tstamp.tv64 == 0)
643 __net_timestamp(skb);
644
645 if (need_software_tstamp) {
646 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
647 struct timeval tv;
648 skb_get_timestamp(skb, &tv);
649 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
650 sizeof(tv), &tv);
651 } else {
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400652 struct timespec ts;
653 skb_get_timestampns(skb, &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000654 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400655 sizeof(ts), &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000656 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700657 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000658
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400659 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400660 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400661 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000662 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400663 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400664 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400665 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2))
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400666 empty = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000667 if (!empty)
668 put_cmsg(msg, SOL_SOCKET,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400669 SCM_TIMESTAMPING, sizeof(tss), &tss);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700670}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300671EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
672
Johannes Berg6e3e9392011-11-09 10:15:42 +0100673void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
674 struct sk_buff *skb)
675{
676 int ack;
677
678 if (!sock_flag(sk, SOCK_WIFI_STATUS))
679 return;
680 if (!skb->wifi_acked_valid)
681 return;
682
683 ack = skb->wifi_acked;
684
685 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
686}
687EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
688
stephen hemminger11165f12010-10-18 14:27:29 +0000689static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
690 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700691{
Eyal Birger744d5a32015-03-01 14:58:31 +0200692 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
Neil Horman3b885782009-10-12 13:26:31 -0700693 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
Eyal Birger744d5a32015-03-01 14:58:31 +0200694 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
Neil Horman3b885782009-10-12 13:26:31 -0700695}
696
Eric Dumazet767dd032010-04-28 19:14:43 +0000697void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700698 struct sk_buff *skb)
699{
700 sock_recv_timestamp(msg, sk, skb);
701 sock_recv_drops(msg, sk, skb);
702}
Eric Dumazet767dd032010-04-28 19:14:43 +0000703EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700704
Ying Xue1b784142015-03-02 15:37:48 +0800705static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
Al Viro2da62902015-03-14 21:13:46 -0400706 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707{
Al Viro2da62902015-03-14 21:13:46 -0400708 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709}
710
Al Viro2da62902015-03-14 21:13:46 -0400711int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700712{
Al Viro2da62902015-03-14 21:13:46 -0400713 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700714
Al Viro2da62902015-03-14 21:13:46 -0400715 return err ?: sock_recvmsg_nosec(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700717EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718
Martin Lucinac1249c02010-12-10 00:04:05 +0000719/**
720 * kernel_recvmsg - Receive a message from a socket (kernel space)
721 * @sock: The socket to receive the message from
722 * @msg: Received message
723 * @vec: Input s/g array for message data
724 * @num: Size of input s/g array
725 * @size: Number of bytes to read
726 * @flags: Message flags (MSG_DONTWAIT, etc...)
727 *
728 * On return the msg structure contains the scatter/gather array passed in the
729 * vec argument. The array is modified so that it consists of the unfilled
730 * portion of the original array.
731 *
732 * The returned value is the total number of bytes received, or an error.
733 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700734int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
735 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736{
737 mm_segment_t oldfs = get_fs();
738 int result;
739
Al Viro6aa24812015-03-21 19:56:16 -0400740 iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 set_fs(KERNEL_DS);
Al Viro2da62902015-03-14 21:13:46 -0400742 result = sock_recvmsg(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 set_fs(oldfs);
744 return result;
745}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700746EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300748static ssize_t sock_sendpage(struct file *file, struct page *page,
749 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750{
751 struct socket *sock;
752 int flags;
753
Eric Dumazetb69aee02005-09-06 14:42:45 -0700754 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
Eric Dumazet35f9c092012-04-05 03:05:35 +0000756 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
757 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
758 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759
Linus Torvaldse6949582009-08-13 08:28:36 -0700760 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761}
762
Jens Axboe9c55e012007-11-06 23:30:13 -0800763static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700764 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800765 unsigned int flags)
766{
767 struct socket *sock = file->private_data;
768
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800769 if (unlikely(!sock->ops->splice_read))
770 return -EINVAL;
771
Jens Axboe9c55e012007-11-06 23:30:13 -0800772 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
773}
774
Al Viro8ae5e032014-11-28 19:40:50 -0500775static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800776{
Al Viro6d652332015-01-30 16:12:56 -0500777 struct file *file = iocb->ki_filp;
778 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700779 struct msghdr msg = {.msg_iter = *to,
780 .msg_iocb = iocb};
Al Viro8ae5e032014-11-28 19:40:50 -0500781 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800782
Al Viro8ae5e032014-11-28 19:40:50 -0500783 if (file->f_flags & O_NONBLOCK)
784 msg.msg_flags = MSG_DONTWAIT;
785
786 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800787 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700788
Christoph Hellwig66ee59a2015-02-11 19:56:46 +0100789 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800790 return 0;
791
Al Viro2da62902015-03-14 21:13:46 -0400792 res = sock_recvmsg(sock, &msg, msg.msg_flags);
Al Viro8ae5e032014-11-28 19:40:50 -0500793 *to = msg.msg_iter;
794 return res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800795}
796
Al Viro8ae5e032014-11-28 19:40:50 -0500797static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798{
Al Viro6d652332015-01-30 16:12:56 -0500799 struct file *file = iocb->ki_filp;
800 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700801 struct msghdr msg = {.msg_iter = *from,
802 .msg_iocb = iocb};
Al Viro8ae5e032014-11-28 19:40:50 -0500803 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800804
Al Viro8ae5e032014-11-28 19:40:50 -0500805 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800806 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700807
Al Viro8ae5e032014-11-28 19:40:50 -0500808 if (file->f_flags & O_NONBLOCK)
809 msg.msg_flags = MSG_DONTWAIT;
810
Al Viro6d652332015-01-30 16:12:56 -0500811 if (sock->type == SOCK_SEQPACKET)
812 msg.msg_flags |= MSG_EOR;
813
Al Virod8725c82014-12-11 00:02:50 -0500814 res = sock_sendmsg(sock, &msg);
Al Viro8ae5e032014-11-28 19:40:50 -0500815 *from = msg.msg_iter;
816 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817}
818
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819/*
820 * Atomic setting of ioctl hooks to avoid race
821 * with module unload.
822 */
823
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800824static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700825static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
Eric W. Biederman881d9662007-09-17 11:56:21 -0700827void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800829 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800831 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832}
833EXPORT_SYMBOL(brioctl_set);
834
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800835static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700836static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837
Eric W. Biederman881d9662007-09-17 11:56:21 -0700838void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800840 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800842 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843}
844EXPORT_SYMBOL(vlan_ioctl_set);
845
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800846static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700847static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700849void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800851 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800853 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854}
855EXPORT_SYMBOL(dlci_ioctl_set);
856
Arnd Bergmann6b960182009-11-06 23:10:54 -0800857static long sock_do_ioctl(struct net *net, struct socket *sock,
858 unsigned int cmd, unsigned long arg)
859{
860 int err;
861 void __user *argp = (void __user *)arg;
862
863 err = sock->ops->ioctl(sock, cmd, arg);
864
865 /*
866 * If this ioctl is unknown try to hand it down
867 * to the NIC driver.
868 */
869 if (err == -ENOIOCTLCMD)
870 err = dev_ioctl(net, cmd, argp);
871
872 return err;
873}
874
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875/*
876 * With an ioctl, arg may well be a user mode pointer, but we don't know
877 * what to do with it - that's up to the protocol still.
878 */
879
880static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
881{
882 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700883 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 void __user *argp = (void __user *)arg;
885 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700886 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
Eric Dumazetb69aee02005-09-06 14:42:45 -0700888 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700889 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900890 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700892 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 } else
Johannes Berg3d23e342009-09-29 23:27:28 +0200894#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700896 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 } else
Johannes Berg3d23e342009-09-29 23:27:28 +0200898#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700899 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 case FIOSETOWN:
901 case SIOCSPGRP:
902 err = -EFAULT;
903 if (get_user(pid, (int __user *)argp))
904 break;
Jeff Laytone0b93ed2014-08-22 11:27:32 -0400905 f_setown(sock->file, pid, 1);
906 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 break;
908 case FIOGETOWN:
909 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700910 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700911 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 break;
913 case SIOCGIFBR:
914 case SIOCSIFBR:
915 case SIOCBRADDBR:
916 case SIOCBRDELBR:
917 err = -ENOPKG;
918 if (!br_ioctl_hook)
919 request_module("bridge");
920
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800921 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700922 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700923 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800924 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 break;
926 case SIOCGIFVLAN:
927 case SIOCSIFVLAN:
928 err = -ENOPKG;
929 if (!vlan_ioctl_hook)
930 request_module("8021q");
931
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800932 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700934 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800935 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 case SIOCADDDLCI:
938 case SIOCDELDLCI:
939 err = -ENOPKG;
940 if (!dlci_ioctl_hook)
941 request_module("dlci");
942
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -0700943 mutex_lock(&dlci_ioctl_mutex);
944 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -0700946 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 break;
948 default:
Arnd Bergmann6b960182009-11-06 23:10:54 -0800949 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700951 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 return err;
953}
954
955int sock_create_lite(int family, int type, int protocol, struct socket **res)
956{
957 int err;
958 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700959
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 err = security_socket_create(family, type, protocol, 1);
961 if (err)
962 goto out;
963
964 sock = sock_alloc();
965 if (!sock) {
966 err = -ENOMEM;
967 goto out;
968 }
969
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -0700971 err = security_socket_post_create(sock, family, type, protocol, 1);
972 if (err)
973 goto out_release;
974
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975out:
976 *res = sock;
977 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -0700978out_release:
979 sock_release(sock);
980 sock = NULL;
981 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700983EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
985/* No kernel lock held - perfect */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700986static unsigned int sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987{
Eliezer Tamircbf55002013-07-08 16:20:34 +0300988 unsigned int busy_flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 struct socket *sock;
990
991 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700992 * We can't return errors to poll, so it's either yes or no.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 */
Eric Dumazetb69aee02005-09-06 14:42:45 -0700994 sock = file->private_data;
Eliezer Tamir2d48d672013-06-24 10:28:03 +0300995
Eliezer Tamircbf55002013-07-08 16:20:34 +0300996 if (sk_can_busy_loop(sock->sk)) {
Eliezer Tamir2d48d672013-06-24 10:28:03 +0300997 /* this socket can poll_ll so tell the system call */
Eliezer Tamircbf55002013-07-08 16:20:34 +0300998 busy_flag = POLL_BUSY_LOOP;
Eliezer Tamir2d48d672013-06-24 10:28:03 +0300999
1000 /* once, only if requested by syscall */
Eliezer Tamircbf55002013-07-08 16:20:34 +03001001 if (wait && (wait->_key & POLL_BUSY_LOOP))
1002 sk_busy_loop(sock->sk, 1);
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001003 }
1004
Eliezer Tamircbf55002013-07-08 16:20:34 +03001005 return busy_flag | sock->ops->poll(file, sock, wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006}
1007
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001008static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001010 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011
1012 return sock->ops->mmap(file, sock, vma);
1013}
1014
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001015static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 sock_release(SOCKET_I(inode));
1018 return 0;
1019}
1020
1021/*
1022 * Update the socket async list
1023 *
1024 * Fasync_list locking strategy.
1025 *
1026 * 1. fasync_list is modified only under process context socket lock
1027 * i.e. under semaphore.
1028 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001029 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 */
1031
1032static int sock_fasync(int fd, struct file *filp, int on)
1033{
Eric Dumazet989a2972010-04-14 09:55:35 +00001034 struct socket *sock = filp->private_data;
1035 struct sock *sk = sock->sk;
Eric Dumazeteaefd112011-02-18 03:26:36 +00001036 struct socket_wq *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037
Eric Dumazet989a2972010-04-14 09:55:35 +00001038 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040
1041 lock_sock(sk);
Hannes Frederic Sowa1e1d04e2016-04-05 17:10:15 +02001042 wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk));
Eric Dumazeteaefd112011-02-18 03:26:36 +00001043 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044
Eric Dumazeteaefd112011-02-18 03:26:36 +00001045 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001046 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001047 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001048 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049
Eric Dumazet989a2972010-04-14 09:55:35 +00001050 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 return 0;
1052}
1053
Eric Dumazetceb5d582015-11-29 20:03:11 -08001054/* This function may be called only under rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055
Eric Dumazetceb5d582015-11-29 20:03:11 -08001056int sock_wake_async(struct socket_wq *wq, int how, int band)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057{
Eric Dumazetceb5d582015-11-29 20:03:11 -08001058 if (!wq || !wq->fasync_list)
1059 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001060
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001061 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001062 case SOCK_WAKE_WAITD:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001063 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 break;
1065 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001066 case SOCK_WAKE_SPACE:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001067 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 break;
1069 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001070 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001071call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001072 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001074 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001075 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08001077
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 return 0;
1079}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001080EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081
Pavel Emelyanov721db932010-09-29 16:06:32 +04001082int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001083 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084{
1085 int err;
1086 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001087 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
1089 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001090 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 */
1092 if (family < 0 || family >= NPROTO)
1093 return -EAFNOSUPPORT;
1094 if (type < 0 || type >= SOCK_MAX)
1095 return -EINVAL;
1096
1097 /* Compatibility.
1098
1099 This uglymoron is moved from INET layer to here to avoid
1100 deadlock in module load.
1101 */
1102 if (family == PF_INET && type == SOCK_PACKET) {
liping.zhangf3c98692016-03-11 23:08:36 +08001103 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1104 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 family = PF_PACKET;
1106 }
1107
1108 err = security_socket_create(family, type, protocol, kern);
1109 if (err)
1110 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001111
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001112 /*
1113 * Allocate the socket and allow the family to set things up. if
1114 * the protocol is 0, the family is instructed to select an appropriate
1115 * default.
1116 */
1117 sock = sock_alloc();
1118 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001119 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001120 return -ENFILE; /* Not exactly a match, but its the
1121 closest posix thing */
1122 }
1123
1124 sock->type = type;
1125
Johannes Berg95a5afc2008-10-16 15:24:51 -07001126#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001127 /* Attempt to load a protocol module if the find failed.
1128 *
1129 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 * requested real, full-featured networking support upon configuration.
1131 * Otherwise module support will break!
1132 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001133 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001134 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135#endif
1136
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001137 rcu_read_lock();
1138 pf = rcu_dereference(net_families[family]);
1139 err = -EAFNOSUPPORT;
1140 if (!pf)
1141 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142
1143 /*
1144 * We will call the ->create function, that possibly is in a loadable
1145 * module, so we have to bump that loadable module refcnt first.
1146 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001147 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 goto out_release;
1149
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001150 /* Now protected by module ref count */
1151 rcu_read_unlock();
1152
Eric Paris3f378b62009-11-05 22:18:14 -08001153 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001154 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001156
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 /*
1158 * Now to bump the refcnt of the [loadable] module that owns this
1159 * socket at sock_release time we decrement its refcnt.
1160 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001161 if (!try_module_get(sock->ops->owner))
1162 goto out_module_busy;
1163
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 /*
1165 * Now that we're done with the ->create function, the [loadable]
1166 * module can have its refcnt decremented
1167 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001168 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001169 err = security_socket_post_create(sock, family, type, protocol, kern);
1170 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001171 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001172 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001174 return 0;
1175
1176out_module_busy:
1177 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001179 sock->ops = NULL;
1180 module_put(pf->owner);
1181out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001183 return err;
1184
1185out_release:
1186 rcu_read_unlock();
1187 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001189EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190
1191int sock_create(int family, int type, int protocol, struct socket **res)
1192{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001193 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001195EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001197int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198{
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001199 return __sock_create(net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001201EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001203SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204{
1205 int retval;
1206 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001207 int flags;
1208
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001209 /* Check the SOCK_* constants for consistency. */
1210 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1211 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1212 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1213 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1214
Ulrich Dreppera677a032008-07-23 21:29:17 -07001215 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001216 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001217 return -EINVAL;
1218 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001220 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1221 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1222
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 retval = sock_create(family, type, protocol, &sock);
1224 if (retval < 0)
1225 goto out;
1226
Ulrich Drepper77d27202008-07-23 21:29:35 -07001227 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 if (retval < 0)
1229 goto out_release;
1230
1231out:
1232 /* It may be already another descriptor 8) Not kernel problem. */
1233 return retval;
1234
1235out_release:
1236 sock_release(sock);
1237 return retval;
1238}
1239
1240/*
1241 * Create a pair of connected sockets.
1242 */
1243
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001244SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1245 int __user *, usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246{
1247 struct socket *sock1, *sock2;
1248 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001249 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001250 int flags;
1251
1252 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001253 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001254 return -EINVAL;
1255 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001257 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1258 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1259
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 /*
1261 * Obtain the first socket and check if the underlying protocol
1262 * supports the socketpair call.
1263 */
1264
1265 err = sock_create(family, type, protocol, &sock1);
1266 if (err < 0)
1267 goto out;
1268
1269 err = sock_create(family, type, protocol, &sock2);
1270 if (err < 0)
1271 goto out_release_1;
1272
1273 err = sock1->ops->socketpair(sock1, sock2);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001274 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 goto out_release_both;
1276
Al Viro28407632012-08-17 23:54:15 -04001277 fd1 = get_unused_fd_flags(flags);
David S. Millerbf3c23d2007-10-29 21:54:02 -07001278 if (unlikely(fd1 < 0)) {
1279 err = fd1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 goto out_release_both;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001281 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001282
Al Viro28407632012-08-17 23:54:15 -04001283 fd2 = get_unused_fd_flags(flags);
Al Viro198de4d2009-08-05 19:29:23 +04001284 if (unlikely(fd2 < 0)) {
1285 err = fd2;
Yann Droneaudd73aa282013-12-09 22:42:20 +01001286 goto out_put_unused_1;
Al Viro28407632012-08-17 23:54:15 -04001287 }
1288
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001289 newfile1 = sock_alloc_file(sock1, flags, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301290 if (IS_ERR(newfile1)) {
Al Viro28407632012-08-17 23:54:15 -04001291 err = PTR_ERR(newfile1);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001292 goto out_put_unused_both;
Al Viro28407632012-08-17 23:54:15 -04001293 }
1294
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001295 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001296 if (IS_ERR(newfile2)) {
1297 err = PTR_ERR(newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001298 goto out_fput_1;
Al Virodb349502007-02-07 01:48:00 -05001299 }
1300
Yann Droneaudd73aa282013-12-09 22:42:20 +01001301 err = put_user(fd1, &usockvec[0]);
1302 if (err)
1303 goto out_fput_both;
1304
1305 err = put_user(fd2, &usockvec[1]);
1306 if (err)
1307 goto out_fput_both;
1308
Al Viro157cf642008-12-14 04:57:47 -05001309 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001310
Al Virodb349502007-02-07 01:48:00 -05001311 fd_install(fd1, newfile1);
1312 fd_install(fd2, newfile2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 /* fd1 and fd2 may be already another descriptors.
1314 * Not kernel problem.
1315 */
1316
Yann Droneaudd73aa282013-12-09 22:42:20 +01001317 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318
Yann Droneaudd73aa282013-12-09 22:42:20 +01001319out_fput_both:
1320 fput(newfile2);
1321 fput(newfile1);
1322 put_unused_fd(fd2);
1323 put_unused_fd(fd1);
1324 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325
Yann Droneaudd73aa282013-12-09 22:42:20 +01001326out_fput_1:
1327 fput(newfile1);
1328 put_unused_fd(fd2);
1329 put_unused_fd(fd1);
1330 sock_release(sock2);
1331 goto out;
1332
1333out_put_unused_both:
1334 put_unused_fd(fd2);
1335out_put_unused_1:
1336 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337out_release_both:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001338 sock_release(sock2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339out_release_1:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001340 sock_release(sock1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341out:
1342 return err;
1343}
1344
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345/*
1346 * Bind a name to a socket. Nothing much to do here since it's
1347 * the protocol's responsibility to handle the local address.
1348 *
1349 * We move the socket address to kernel space before we call
1350 * the protocol layer (having also checked the address is ok).
1351 */
1352
Heiko Carstens20f37032009-01-14 14:14:23 +01001353SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354{
1355 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001356 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001357 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001359 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001360 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001361 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001362 if (err >= 0) {
1363 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001364 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001365 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001366 if (!err)
1367 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001368 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001369 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001371 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001372 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 return err;
1374}
1375
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376/*
1377 * Perform a listen. Basically, we allow the protocol to do anything
1378 * necessary for a listen, and if that works, we mark the socket as
1379 * ready for listening.
1380 */
1381
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001382SYSCALL_DEFINE2(listen, int, fd, int, backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383{
1384 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001385 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001386 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001387
1388 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1389 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001390 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001391 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001392 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393
1394 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001395 if (!err)
1396 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001398 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 }
1400 return err;
1401}
1402
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403/*
1404 * For accept, we attempt to create a new socket, set up the link
1405 * with the client, wake up the client, then return the new
1406 * connected fd. We collect the address of the connector in kernel
1407 * space and move it to user at the very end. This is unclean because
1408 * we open the socket then return an error.
1409 *
1410 * 1003.1g adds the ability to recvmsg() to query connection pending
1411 * status to recvmsg. We need to add that support in a way thats
1412 * clean when we restucture accept also.
1413 */
1414
Heiko Carstens20f37032009-01-14 14:14:23 +01001415SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1416 int __user *, upeer_addrlen, int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417{
1418 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001419 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001420 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001421 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422
Ulrich Drepper77d27202008-07-23 21:29:35 -07001423 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001424 return -EINVAL;
1425
1426 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1427 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1428
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001429 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 if (!sock)
1431 goto out;
1432
1433 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001434 newsock = sock_alloc();
1435 if (!newsock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 goto out_put;
1437
1438 newsock->type = sock->type;
1439 newsock->ops = sock->ops;
1440
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 /*
1442 * We don't need try_module_get here, as the listening socket (sock)
1443 * has the protocol module (sock->ops->owner) held.
1444 */
1445 __module_get(newsock->ops->owner);
1446
Al Viro28407632012-08-17 23:54:15 -04001447 newfd = get_unused_fd_flags(flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001448 if (unlikely(newfd < 0)) {
1449 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001450 sock_release(newsock);
1451 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001452 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001453 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301454 if (IS_ERR(newfile)) {
Al Viro28407632012-08-17 23:54:15 -04001455 err = PTR_ERR(newfile);
1456 put_unused_fd(newfd);
1457 sock_release(newsock);
1458 goto out_put;
1459 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001460
Frank Filza79af592005-09-27 15:23:38 -07001461 err = security_socket_accept(sock, newsock);
1462 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001463 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001464
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1466 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001467 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468
1469 if (upeer_sockaddr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001470 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001471 &len, 2) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001473 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001475 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001476 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001478 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479 }
1480
1481 /* File flags are not inherited via accept() unlike another OSes. */
1482
David S. Miller39d8c1b2006-03-20 17:13:49 -08001483 fd_install(newfd, newfile);
1484 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001487 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488out:
1489 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001490out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001491 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001492 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 goto out_put;
1494}
1495
Heiko Carstens20f37032009-01-14 14:14:23 +01001496SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1497 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001498{
Ulrich Drepperde11def2008-11-19 15:36:14 -08001499 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001500}
1501
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502/*
1503 * Attempt to connect to a socket with the server address. The address
1504 * is in user space so we verify it is OK and move it to kernel space.
1505 *
1506 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1507 * break bindings
1508 *
1509 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1510 * other SEQPACKET protocols that take time to connect() as it doesn't
1511 * include the -EINPROGRESS status for such sockets.
1512 */
1513
Heiko Carstens20f37032009-01-14 14:14:23 +01001514SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1515 int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516{
1517 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001518 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001519 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001521 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522 if (!sock)
1523 goto out;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001524 err = move_addr_to_kernel(uservaddr, addrlen, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 if (err < 0)
1526 goto out_put;
1527
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001528 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001529 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 if (err)
1531 goto out_put;
1532
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001533 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 sock->file->f_flags);
1535out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001536 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537out:
1538 return err;
1539}
1540
1541/*
1542 * Get the local address ('name') of a socket object. Move the obtained
1543 * name to user space.
1544 */
1545
Heiko Carstens20f37032009-01-14 14:14:23 +01001546SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1547 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548{
1549 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001550 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001551 int len, err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001552
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001553 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 if (!sock)
1555 goto out;
1556
1557 err = security_socket_getsockname(sock);
1558 if (err)
1559 goto out_put;
1560
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001561 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562 if (err)
1563 goto out_put;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001564 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565
1566out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001567 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568out:
1569 return err;
1570}
1571
1572/*
1573 * Get the remote address ('name') of a socket object. Move the obtained
1574 * name to user space.
1575 */
1576
Heiko Carstens20f37032009-01-14 14:14:23 +01001577SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1578 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579{
1580 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001581 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001582 int len, err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001584 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1585 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 err = security_socket_getpeername(sock);
1587 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001588 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589 return err;
1590 }
1591
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001592 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001593 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001594 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595 if (!err)
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001596 err = move_addr_to_user(&address, len, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001597 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001598 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599 }
1600 return err;
1601}
1602
1603/*
1604 * Send a datagram to a given address. We move the address into kernel
1605 * space and check the user space data area is readable before invoking
1606 * the protocol.
1607 */
1608
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001609SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001610 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001611 int, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612{
1613 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001614 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615 int err;
1616 struct msghdr msg;
1617 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001618 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001619
Al Viro602bd0e2015-03-21 19:12:32 -04001620 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
1621 if (unlikely(err))
1622 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001623 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1624 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001625 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001626
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001627 msg.msg_name = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001628 msg.msg_control = NULL;
1629 msg.msg_controllen = 0;
1630 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001631 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001632 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633 if (err < 0)
1634 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001635 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001636 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637 }
1638 if (sock->file->f_flags & O_NONBLOCK)
1639 flags |= MSG_DONTWAIT;
1640 msg.msg_flags = flags;
Al Virod8725c82014-12-11 00:02:50 -05001641 err = sock_sendmsg(sock, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001643out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001644 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001645out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 return err;
1647}
1648
1649/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001650 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651 */
1652
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001653SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001654 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655{
1656 return sys_sendto(fd, buff, len, flags, NULL, 0);
1657}
1658
1659/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001660 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661 * sender. We verify the buffers are writable and if needed move the
1662 * sender address from kernel to user space.
1663 */
1664
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001665SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
Eric Dumazet95c96172012-04-15 05:58:06 +00001666 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001667 int __user *, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668{
1669 struct socket *sock;
1670 struct iovec iov;
1671 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001672 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001673 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001674 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675
Al Viro602bd0e2015-03-21 19:12:32 -04001676 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
1677 if (unlikely(err))
1678 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001679 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001681 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001683 msg.msg_control = NULL;
1684 msg.msg_controllen = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01001685 /* Save some cycles and don't copy the address if not needed */
1686 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1687 /* We assume all kernel code knows the size of sockaddr_storage */
1688 msg.msg_namelen = 0;
tadeusz.struk@intel.com130ed5d2015-12-15 10:46:17 -08001689 msg.msg_iocb = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 if (sock->file->f_flags & O_NONBLOCK)
1691 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04001692 err = sock_recvmsg(sock, &msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001694 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001695 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001696 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001697 if (err2 < 0)
1698 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001700
1701 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001702out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 return err;
1704}
1705
1706/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001707 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708 */
1709
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02001710SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1711 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712{
1713 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1714}
1715
1716/*
1717 * Set a socket option. Because we don't know the option lengths we have
1718 * to pass the user mode parameter for the protocols to sort out.
1719 */
1720
Heiko Carstens20f37032009-01-14 14:14:23 +01001721SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1722 char __user *, optval, int, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001724 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 struct socket *sock;
1726
1727 if (optlen < 0)
1728 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001729
1730 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1731 if (sock != NULL) {
1732 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001733 if (err)
1734 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735
1736 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001737 err =
1738 sock_setsockopt(sock, level, optname, optval,
1739 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001741 err =
1742 sock->ops->setsockopt(sock, level, optname, optval,
1743 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001744out_put:
1745 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746 }
1747 return err;
1748}
1749
1750/*
1751 * Get a socket option. Because we don't know the option lengths we have
1752 * to pass a user mode parameter for the protocols to sort out.
1753 */
1754
Heiko Carstens20f37032009-01-14 14:14:23 +01001755SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1756 char __user *, optval, int __user *, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001758 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759 struct socket *sock;
1760
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001761 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1762 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001763 err = security_socket_getsockopt(sock, level, optname);
1764 if (err)
1765 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766
1767 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001768 err =
1769 sock_getsockopt(sock, level, optname, optval,
1770 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001772 err =
1773 sock->ops->getsockopt(sock, level, optname, optval,
1774 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001775out_put:
1776 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 }
1778 return err;
1779}
1780
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781/*
1782 * Shutdown a socket.
1783 */
1784
Heiko Carstens754fe8d2009-01-14 14:14:09 +01001785SYSCALL_DEFINE2(shutdown, int, fd, int, how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001787 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 struct socket *sock;
1789
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001790 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1791 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001793 if (!err)
1794 err = sock->ops->shutdown(sock, how);
1795 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796 }
1797 return err;
1798}
1799
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001800/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801 * fields which are the same type (int / unsigned) on our platforms.
1802 */
1803#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1804#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1805#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1806
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001807struct used_address {
1808 struct sockaddr_storage name;
1809 unsigned int name_len;
1810};
1811
Al Viroda184282015-03-21 19:29:06 -04001812static int copy_msghdr_from_user(struct msghdr *kmsg,
1813 struct user_msghdr __user *umsg,
1814 struct sockaddr __user **save_addr,
1815 struct iovec **iov)
Dan Carpenter1661bf32013-10-03 00:27:20 +03001816{
Al Viro08adb7d2014-11-10 20:23:13 -05001817 struct sockaddr __user *uaddr;
1818 struct iovec __user *uiov;
Al Viroc0371da2014-11-24 10:42:55 -05001819 size_t nr_segs;
Al Viro08adb7d2014-11-10 20:23:13 -05001820 ssize_t err;
1821
1822 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
1823 __get_user(uaddr, &umsg->msg_name) ||
1824 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
1825 __get_user(uiov, &umsg->msg_iov) ||
Al Viroc0371da2014-11-24 10:42:55 -05001826 __get_user(nr_segs, &umsg->msg_iovlen) ||
Al Viro08adb7d2014-11-10 20:23:13 -05001827 __get_user(kmsg->msg_control, &umsg->msg_control) ||
1828 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
1829 __get_user(kmsg->msg_flags, &umsg->msg_flags))
Dan Carpenter1661bf32013-10-03 00:27:20 +03001830 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00001831
Al Viro08adb7d2014-11-10 20:23:13 -05001832 if (!uaddr)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07001833 kmsg->msg_namelen = 0;
1834
Matthew Leachdbb490b2014-03-11 11:58:27 +00001835 if (kmsg->msg_namelen < 0)
1836 return -EINVAL;
1837
Dan Carpenter1661bf32013-10-03 00:27:20 +03001838 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03001839 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05001840
1841 if (save_addr)
1842 *save_addr = uaddr;
1843
1844 if (uaddr && kmsg->msg_namelen) {
1845 if (!save_addr) {
1846 err = move_addr_to_kernel(uaddr, kmsg->msg_namelen,
1847 kmsg->msg_name);
1848 if (err < 0)
1849 return err;
1850 }
1851 } else {
1852 kmsg->msg_name = NULL;
1853 kmsg->msg_namelen = 0;
1854 }
1855
Al Viroc0371da2014-11-24 10:42:55 -05001856 if (nr_segs > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05001857 return -EMSGSIZE;
1858
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07001859 kmsg->msg_iocb = NULL;
1860
Al Viroda184282015-03-21 19:29:06 -04001861 return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs,
1862 UIO_FASTIOV, iov, &kmsg->msg_iter);
Dan Carpenter1661bf32013-10-03 00:27:20 +03001863}
1864
Al Viro666547f2014-04-06 14:03:05 -04001865static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00001866 struct msghdr *msg_sys, unsigned int flags,
Tom Herbert28a94d82016-03-07 14:11:02 -08001867 struct used_address *used_address,
1868 unsigned int allowed_msghdr_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001870 struct compat_msghdr __user *msg_compat =
1871 (struct compat_msghdr __user *)msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001872 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07001874 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001875 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1876 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877 unsigned char *ctl_buf = ctl;
Al Virod8725c82014-12-11 00:02:50 -05001878 int ctl_len;
Al Viro08adb7d2014-11-10 20:23:13 -05001879 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001880
Al Viro08adb7d2014-11-10 20:23:13 -05001881 msg_sys->msg_name = &address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882
Al Viro08449322014-11-09 22:33:45 -05001883 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05001884 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
Al Viro08449322014-11-09 22:33:45 -05001885 else
Al Viro08adb7d2014-11-10 20:23:13 -05001886 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001887 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04001888 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889
1890 err = -ENOBUFS;
1891
Anton Blanchard228e5482011-05-02 20:21:35 +00001892 if (msg_sys->msg_controllen > INT_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893 goto out_freeiov;
Tom Herbert28a94d82016-03-07 14:11:02 -08001894 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
Anton Blanchard228e5482011-05-02 20:21:35 +00001895 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001897 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00001898 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001899 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001900 if (err)
1901 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00001902 ctl_buf = msg_sys->msg_control;
1903 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904 } else if (ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001905 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001907 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908 goto out_freeiov;
1909 }
1910 err = -EFAULT;
1911 /*
Anton Blanchard228e5482011-05-02 20:21:35 +00001912 * Careful! Before this, msg_sys->msg_control contains a user pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1914 * checking falls down on this.
1915 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00001916 if (copy_from_user(ctl_buf,
Anton Blanchard228e5482011-05-02 20:21:35 +00001917 (void __user __force *)msg_sys->msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001918 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00001920 msg_sys->msg_control = ctl_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921 }
Anton Blanchard228e5482011-05-02 20:21:35 +00001922 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923
1924 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00001925 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001926 /*
1927 * If this is sendmmsg() and current destination address is same as
1928 * previously succeeded address, omit asking LSM's decision.
1929 * used_address->name_len is initialized to UINT_MAX so that the first
1930 * destination address never matches.
1931 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07001932 if (used_address && msg_sys->msg_name &&
1933 used_address->name_len == msg_sys->msg_namelen &&
1934 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001935 used_address->name_len)) {
Al Virod8725c82014-12-11 00:02:50 -05001936 err = sock_sendmsg_nosec(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001937 goto out_freectl;
1938 }
Al Virod8725c82014-12-11 00:02:50 -05001939 err = sock_sendmsg(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001940 /*
1941 * If this is sendmmsg() and sending to current destination address was
1942 * successful, remember it.
1943 */
1944 if (used_address && err >= 0) {
1945 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07001946 if (msg_sys->msg_name)
1947 memcpy(&used_address->name, msg_sys->msg_name,
1948 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001949 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950
1951out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001952 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1954out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04001955 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00001956 return err;
1957}
1958
1959/*
1960 * BSD sendmsg interface
1961 */
1962
Al Viro666547f2014-04-06 14:03:05 -04001963long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
Anton Blanchard228e5482011-05-02 20:21:35 +00001964{
1965 int fput_needed, err;
1966 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07001967 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00001968
Andy Lutomirski1be374a2013-05-22 14:07:44 -07001969 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00001970 if (!sock)
1971 goto out;
1972
Tom Herbert28a94d82016-03-07 14:11:02 -08001973 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
Anton Blanchard228e5482011-05-02 20:21:35 +00001974
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001975 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001976out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977 return err;
1978}
1979
Al Viro666547f2014-04-06 14:03:05 -04001980SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00001981{
1982 if (flags & MSG_CMSG_COMPAT)
1983 return -EINVAL;
1984 return __sys_sendmsg(fd, msg, flags);
1985}
1986
Anton Blanchard228e5482011-05-02 20:21:35 +00001987/*
1988 * Linux sendmmsg interface
1989 */
1990
1991int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
1992 unsigned int flags)
1993{
1994 int fput_needed, err, datagrams;
1995 struct socket *sock;
1996 struct mmsghdr __user *entry;
1997 struct compat_mmsghdr __user *compat_entry;
1998 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001999 struct used_address used_address;
Tom Herbertf0922762016-03-07 14:11:03 -08002000 unsigned int oflags = flags;
Anton Blanchard228e5482011-05-02 20:21:35 +00002001
Anton Blanchard98382f42011-08-04 14:07:39 +00002002 if (vlen > UIO_MAXIOV)
2003 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002004
2005 datagrams = 0;
2006
2007 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2008 if (!sock)
2009 return err;
2010
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002011 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002012 entry = mmsg;
2013 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002014 err = 0;
Tom Herbertf0922762016-03-07 14:11:03 -08002015 flags |= MSG_BATCH;
Anton Blanchard228e5482011-05-02 20:21:35 +00002016
2017 while (datagrams < vlen) {
Tom Herbertf0922762016-03-07 14:11:03 -08002018 if (datagrams == vlen - 1)
2019 flags = oflags;
2020
Anton Blanchard228e5482011-05-02 20:21:35 +00002021 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002022 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002023 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002024 if (err < 0)
2025 break;
2026 err = __put_user(err, &compat_entry->msg_len);
2027 ++compat_entry;
2028 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002029 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002030 (struct user_msghdr __user *)entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002031 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002032 if (err < 0)
2033 break;
2034 err = put_user(err, &entry->msg_len);
2035 ++entry;
2036 }
2037
2038 if (err)
2039 break;
2040 ++datagrams;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002041 cond_resched();
Anton Blanchard228e5482011-05-02 20:21:35 +00002042 }
2043
Anton Blanchard228e5482011-05-02 20:21:35 +00002044 fput_light(sock->file, fput_needed);
2045
Anton Blanchard728ffb82011-08-04 14:07:38 +00002046 /* We only return an error if no datagrams were able to be sent */
2047 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002048 return datagrams;
2049
Anton Blanchard228e5482011-05-02 20:21:35 +00002050 return err;
2051}
2052
2053SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2054 unsigned int, vlen, unsigned int, flags)
2055{
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002056 if (flags & MSG_CMSG_COMPAT)
2057 return -EINVAL;
Anton Blanchard228e5482011-05-02 20:21:35 +00002058 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2059}
2060
Al Viro666547f2014-04-06 14:03:05 -04002061static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002062 struct msghdr *msg_sys, unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002064 struct compat_msghdr __user *msg_compat =
2065 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002067 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068 unsigned long cmsg_ptr;
Al Viro2da62902015-03-14 21:13:46 -04002069 int len;
Al Viro08adb7d2014-11-10 20:23:13 -05002070 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071
2072 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002073 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002074
2075 /* user mode address pointers */
2076 struct sockaddr __user *uaddr;
Al Viro08adb7d2014-11-10 20:23:13 -05002077 int __user *uaddr_len = COMPAT_NAMELEN(msg);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002078
Al Viro08adb7d2014-11-10 20:23:13 -05002079 msg_sys->msg_name = &addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002081 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002082 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002083 else
Al Viro08adb7d2014-11-10 20:23:13 -05002084 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04002086 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002088 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2089 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002090
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002091 /* We assume all kernel code knows the size of sockaddr_storage */
2092 msg_sys->msg_namelen = 0;
2093
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094 if (sock->file->f_flags & O_NONBLOCK)
2095 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002096 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097 if (err < 0)
2098 goto out_freeiov;
2099 len = err;
2100
2101 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002102 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002103 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002104 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 if (err < 0)
2106 goto out_freeiov;
2107 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002108 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002109 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110 if (err)
2111 goto out_freeiov;
2112 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002113 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114 &msg_compat->msg_controllen);
2115 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002116 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002117 &msg->msg_controllen);
2118 if (err)
2119 goto out_freeiov;
2120 err = len;
2121
2122out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04002123 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002124 return err;
2125}
2126
2127/*
2128 * BSD recvmsg interface
2129 */
2130
Al Viro666547f2014-04-06 14:03:05 -04002131long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002132{
2133 int fput_needed, err;
2134 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002135 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002136
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002137 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002138 if (!sock)
2139 goto out;
2140
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002141 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002142
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002143 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144out:
2145 return err;
2146}
2147
Al Viro666547f2014-04-06 14:03:05 -04002148SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002149 unsigned int, flags)
2150{
2151 if (flags & MSG_CMSG_COMPAT)
2152 return -EINVAL;
2153 return __sys_recvmsg(fd, msg, flags);
2154}
2155
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002156/*
2157 * Linux recvmmsg interface
2158 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002160int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2161 unsigned int flags, struct timespec *timeout)
2162{
2163 int fput_needed, err, datagrams;
2164 struct socket *sock;
2165 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002166 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002167 struct msghdr msg_sys;
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002168 struct timespec64 end_time;
2169 struct timespec64 timeout64;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002170
2171 if (timeout &&
2172 poll_select_set_timeout(&end_time, timeout->tv_sec,
2173 timeout->tv_nsec))
2174 return -EINVAL;
2175
2176 datagrams = 0;
2177
2178 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2179 if (!sock)
2180 return err;
2181
2182 err = sock_error(sock->sk);
2183 if (err)
2184 goto out_put;
2185
2186 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002187 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002188
2189 while (datagrams < vlen) {
2190 /*
2191 * No need to ask LSM for more than the first datagram.
2192 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002193 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002194 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002195 &msg_sys, flags & ~MSG_WAITFORONE,
2196 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002197 if (err < 0)
2198 break;
2199 err = __put_user(err, &compat_entry->msg_len);
2200 ++compat_entry;
2201 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002202 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002203 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002204 &msg_sys, flags & ~MSG_WAITFORONE,
2205 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002206 if (err < 0)
2207 break;
2208 err = put_user(err, &entry->msg_len);
2209 ++entry;
2210 }
2211
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002212 if (err)
2213 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002214 ++datagrams;
2215
Brandon L Black71c5c152010-03-26 16:18:03 +00002216 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2217 if (flags & MSG_WAITFORONE)
2218 flags |= MSG_DONTWAIT;
2219
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002220 if (timeout) {
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002221 ktime_get_ts64(&timeout64);
2222 *timeout = timespec64_to_timespec(
2223 timespec64_sub(end_time, timeout64));
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002224 if (timeout->tv_sec < 0) {
2225 timeout->tv_sec = timeout->tv_nsec = 0;
2226 break;
2227 }
2228
2229 /* Timeout, return less than vlen datagrams */
2230 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2231 break;
2232 }
2233
2234 /* Out of band data, return right away */
2235 if (msg_sys.msg_flags & MSG_OOB)
2236 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002237 cond_resched();
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002238 }
2239
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002240 if (err == 0)
2241 goto out_put;
2242
2243 if (datagrams == 0) {
2244 datagrams = err;
2245 goto out_put;
2246 }
2247
2248 /*
2249 * We may return less entries than requested (vlen) if the
2250 * sock is non block and there aren't enough datagrams...
2251 */
2252 if (err != -EAGAIN) {
2253 /*
2254 * ... or if recvmsg returns an error after we
2255 * received some datagrams, where we record the
2256 * error to return on the next call or if the
2257 * app asks about it using getsockopt(SO_ERROR).
2258 */
2259 sock->sk->sk_err = -err;
2260 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002261out_put:
2262 fput_light(sock->file, fput_needed);
2263
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002264 return datagrams;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002265}
2266
2267SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2268 unsigned int, vlen, unsigned int, flags,
2269 struct timespec __user *, timeout)
2270{
2271 int datagrams;
2272 struct timespec timeout_sys;
2273
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002274 if (flags & MSG_CMSG_COMPAT)
2275 return -EINVAL;
2276
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002277 if (!timeout)
2278 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2279
2280 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2281 return -EFAULT;
2282
2283 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2284
2285 if (datagrams > 0 &&
2286 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2287 datagrams = -EFAULT;
2288
2289 return datagrams;
2290}
2291
2292#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002293/* Argument list sizes for sys_socketcall */
2294#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002295static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002296 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2297 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2298 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002299 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002300};
2301
Linus Torvalds1da177e2005-04-16 15:20:36 -07002302#undef AL
2303
2304/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002305 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002306 *
2307 * Argument checking cleaned up. Saved 20% in size.
2308 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002309 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002310 */
2311
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002312SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313{
Chen Gang2950fa92013-04-07 16:55:23 +08002314 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002315 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002316 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002317 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318
Anton Blanchard228e5482011-05-02 20:21:35 +00002319 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002320 return -EINVAL;
2321
Arjan van de Ven47379052009-09-28 12:57:44 -07002322 len = nargs[call];
2323 if (len > sizeof(a))
2324 return -EINVAL;
2325
Linus Torvalds1da177e2005-04-16 15:20:36 -07002326 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002327 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002328 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002329
Chen Gang2950fa92013-04-07 16:55:23 +08002330 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2331 if (err)
2332 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002333
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002334 a0 = a[0];
2335 a1 = a[1];
2336
2337 switch (call) {
2338 case SYS_SOCKET:
2339 err = sys_socket(a0, a1, a[2]);
2340 break;
2341 case SYS_BIND:
2342 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2343 break;
2344 case SYS_CONNECT:
2345 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2346 break;
2347 case SYS_LISTEN:
2348 err = sys_listen(a0, a1);
2349 break;
2350 case SYS_ACCEPT:
Ulrich Drepperde11def2008-11-19 15:36:14 -08002351 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2352 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002353 break;
2354 case SYS_GETSOCKNAME:
2355 err =
2356 sys_getsockname(a0, (struct sockaddr __user *)a1,
2357 (int __user *)a[2]);
2358 break;
2359 case SYS_GETPEERNAME:
2360 err =
2361 sys_getpeername(a0, (struct sockaddr __user *)a1,
2362 (int __user *)a[2]);
2363 break;
2364 case SYS_SOCKETPAIR:
2365 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2366 break;
2367 case SYS_SEND:
2368 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2369 break;
2370 case SYS_SENDTO:
2371 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2372 (struct sockaddr __user *)a[4], a[5]);
2373 break;
2374 case SYS_RECV:
2375 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2376 break;
2377 case SYS_RECVFROM:
2378 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2379 (struct sockaddr __user *)a[4],
2380 (int __user *)a[5]);
2381 break;
2382 case SYS_SHUTDOWN:
2383 err = sys_shutdown(a0, a1);
2384 break;
2385 case SYS_SETSOCKOPT:
2386 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2387 break;
2388 case SYS_GETSOCKOPT:
2389 err =
2390 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2391 (int __user *)a[4]);
2392 break;
2393 case SYS_SENDMSG:
Al Viro666547f2014-04-06 14:03:05 -04002394 err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002395 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002396 case SYS_SENDMMSG:
2397 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2398 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002399 case SYS_RECVMSG:
Al Viro666547f2014-04-06 14:03:05 -04002400 err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002401 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002402 case SYS_RECVMMSG:
2403 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2404 (struct timespec __user *)a[4]);
2405 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002406 case SYS_ACCEPT4:
2407 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2408 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002409 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002410 default:
2411 err = -EINVAL;
2412 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413 }
2414 return err;
2415}
2416
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002417#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002418
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002419/**
2420 * sock_register - add a socket protocol handler
2421 * @ops: description of protocol
2422 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002423 * This function is called by a protocol handler that wants to
2424 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09002425 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002426 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002427 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002428int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002429{
2430 int err;
2431
2432 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08002433 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002434 return -ENOBUFS;
2435 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002436
2437 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002438 if (rcu_dereference_protected(net_families[ops->family],
2439 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002440 err = -EEXIST;
2441 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00002442 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002443 err = 0;
2444 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002445 spin_unlock(&net_family_lock);
2446
Yang Yingliang3410f222014-02-12 17:09:55 +08002447 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002448 return err;
2449}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002450EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002451
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002452/**
2453 * sock_unregister - remove a protocol handler
2454 * @family: protocol family to remove
2455 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002456 * This function is called by a protocol handler that wants to
2457 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002458 * new socket creation.
2459 *
2460 * If protocol handler is a module, then it can use module reference
2461 * counts to protect against new references. If protocol handler is not
2462 * a module then it needs to provide its own protection in
2463 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002464 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002465void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002466{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002467 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002468
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002469 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00002470 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002471 spin_unlock(&net_family_lock);
2472
2473 synchronize_rcu();
2474
Yang Yingliang3410f222014-02-12 17:09:55 +08002475 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002476}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002477EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002478
Andi Kleen77d76ea2005-12-22 12:43:42 -08002479static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002480{
Nick Pigginb3e19d92011-01-07 17:50:11 +11002481 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00002482 /*
2483 * Initialize the network sysctl infrastructure.
2484 */
2485 err = net_sysctl_init();
2486 if (err)
2487 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11002488
Linus Torvalds1da177e2005-04-16 15:20:36 -07002489 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002490 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002491 */
2492 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002493
2494 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002495 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002496 */
2497
2498 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11002499
2500 err = register_filesystem(&sock_fs_type);
2501 if (err)
2502 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11002504 if (IS_ERR(sock_mnt)) {
2505 err = PTR_ERR(sock_mnt);
2506 goto out_mount;
2507 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08002508
2509 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002510 */
2511
2512#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00002513 err = netfilter_init();
2514 if (err)
2515 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002516#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002517
Daniel Borkmann408eccc2014-04-01 16:20:23 +02002518 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00002519
Nick Pigginb3e19d92011-01-07 17:50:11 +11002520out:
2521 return err;
2522
2523out_mount:
2524 unregister_filesystem(&sock_fs_type);
2525out_fs:
2526 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002527}
2528
Andi Kleen77d76ea2005-12-22 12:43:42 -08002529core_initcall(sock_init); /* early initcall */
2530
Linus Torvalds1da177e2005-04-16 15:20:36 -07002531#ifdef CONFIG_PROC_FS
2532void socket_seq_show(struct seq_file *seq)
2533{
2534 int cpu;
2535 int counter = 0;
2536
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07002537 for_each_possible_cpu(cpu)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002538 counter += per_cpu(sockets_in_use, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002539
2540 /* It can be negative, by the way. 8) */
2541 if (counter < 0)
2542 counter = 0;
2543
2544 seq_printf(seq, "sockets: used %d\n", counter);
2545}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002546#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002547
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002548#ifdef CONFIG_COMPAT
Arnd Bergmann6b960182009-11-06 23:10:54 -08002549static int do_siocgstamp(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002550 unsigned int cmd, void __user *up)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002551{
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002552 mm_segment_t old_fs = get_fs();
2553 struct timeval ktv;
2554 int err;
2555
2556 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002557 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002558 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002559 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002560 err = compat_put_timeval(&ktv, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002561
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002562 return err;
2563}
2564
Arnd Bergmann6b960182009-11-06 23:10:54 -08002565static int do_siocgstampns(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002566 unsigned int cmd, void __user *up)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002567{
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002568 mm_segment_t old_fs = get_fs();
2569 struct timespec kts;
2570 int err;
2571
2572 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002573 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002574 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002575 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002576 err = compat_put_timespec(&kts, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002577
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002578 return err;
2579}
2580
Arnd Bergmann6b960182009-11-06 23:10:54 -08002581static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002582{
2583 struct ifreq __user *uifr;
2584 int err;
2585
2586 uifr = compat_alloc_user_space(sizeof(struct ifreq));
Arnd Bergmann6b960182009-11-06 23:10:54 -08002587 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002588 return -EFAULT;
2589
Arnd Bergmann6b960182009-11-06 23:10:54 -08002590 err = dev_ioctl(net, SIOCGIFNAME, uifr);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002591 if (err)
2592 return err;
2593
Arnd Bergmann6b960182009-11-06 23:10:54 -08002594 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002595 return -EFAULT;
2596
2597 return 0;
2598}
2599
Arnd Bergmann6b960182009-11-06 23:10:54 -08002600static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002601{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002602 struct compat_ifconf ifc32;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002603 struct ifconf ifc;
2604 struct ifconf __user *uifc;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002605 struct compat_ifreq __user *ifr32;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002606 struct ifreq __user *ifr;
2607 unsigned int i, j;
2608 int err;
2609
Arnd Bergmann6b960182009-11-06 23:10:54 -08002610 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002611 return -EFAULT;
2612
Mathias Krause43da5f22012-08-15 11:31:57 +00002613 memset(&ifc, 0, sizeof(ifc));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002614 if (ifc32.ifcbuf == 0) {
2615 ifc32.ifc_len = 0;
2616 ifc.ifc_len = 0;
2617 ifc.ifc_req = NULL;
2618 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2619 } else {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002620 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2621 sizeof(struct ifreq);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002622 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2623 ifc.ifc_len = len;
2624 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2625 ifr32 = compat_ptr(ifc32.ifcbuf);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002626 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
Arnd Bergmann6b960182009-11-06 23:10:54 -08002627 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002628 return -EFAULT;
2629 ifr++;
2630 ifr32++;
2631 }
2632 }
2633 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2634 return -EFAULT;
2635
Arnd Bergmann6b960182009-11-06 23:10:54 -08002636 err = dev_ioctl(net, SIOCGIFCONF, uifc);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002637 if (err)
2638 return err;
2639
2640 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2641 return -EFAULT;
2642
2643 ifr = ifc.ifc_req;
2644 ifr32 = compat_ptr(ifc32.ifcbuf);
2645 for (i = 0, j = 0;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002646 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2647 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2648 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002649 return -EFAULT;
2650 ifr32++;
2651 ifr++;
2652 }
2653
2654 if (ifc32.ifcbuf == 0) {
2655 /* Translate from 64-bit structure multiple to
2656 * a 32-bit one.
2657 */
2658 i = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002659 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002660 ifc32.ifc_len = i;
2661 } else {
2662 ifc32.ifc_len = i;
2663 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08002664 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002665 return -EFAULT;
2666
2667 return 0;
2668}
2669
Arnd Bergmann6b960182009-11-06 23:10:54 -08002670static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002671{
Ben Hutchings3a7da392011-03-17 07:34:32 +00002672 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2673 bool convert_in = false, convert_out = false;
2674 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2675 struct ethtool_rxnfc __user *rxnfc;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002676 struct ifreq __user *ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002677 u32 rule_cnt = 0, actual_rule_cnt;
2678 u32 ethcmd;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002679 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002680 int ret;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002681
2682 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2683 return -EFAULT;
2684
Ben Hutchings3a7da392011-03-17 07:34:32 +00002685 compat_rxnfc = compat_ptr(data);
2686
2687 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002688 return -EFAULT;
2689
Ben Hutchings3a7da392011-03-17 07:34:32 +00002690 /* Most ethtool structures are defined without padding.
2691 * Unfortunately struct ethtool_rxnfc is an exception.
2692 */
2693 switch (ethcmd) {
2694 default:
2695 break;
2696 case ETHTOOL_GRXCLSRLALL:
2697 /* Buffer size is variable */
2698 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2699 return -EFAULT;
2700 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2701 return -ENOMEM;
2702 buf_size += rule_cnt * sizeof(u32);
2703 /* fall through */
2704 case ETHTOOL_GRXRINGS:
2705 case ETHTOOL_GRXCLSRLCNT:
2706 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00002707 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002708 convert_out = true;
2709 /* fall through */
2710 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002711 buf_size += sizeof(struct ethtool_rxnfc);
2712 convert_in = true;
2713 break;
2714 }
2715
2716 ifr = compat_alloc_user_space(buf_size);
Stephen Hemminger954b1242013-02-11 06:22:28 +00002717 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
Ben Hutchings3a7da392011-03-17 07:34:32 +00002718
2719 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2720 return -EFAULT;
2721
2722 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2723 &ifr->ifr_ifru.ifru_data))
2724 return -EFAULT;
2725
2726 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00002727 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00002728 * fs.ring_cookie and at the end of fs, but nowhere else.
2729 */
Alexander Duyck127fe532011-04-08 18:01:59 +00002730 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2731 sizeof(compat_rxnfc->fs.m_ext) !=
2732 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2733 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00002734 BUILD_BUG_ON(
2735 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2736 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2737 offsetof(struct ethtool_rxnfc, fs.location) -
2738 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2739
2740 if (copy_in_user(rxnfc, compat_rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002741 (void __user *)(&rxnfc->fs.m_ext + 1) -
2742 (void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002743 copy_in_user(&rxnfc->fs.ring_cookie,
2744 &compat_rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002745 (void __user *)(&rxnfc->fs.location + 1) -
2746 (void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002747 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2748 sizeof(rxnfc->rule_cnt)))
2749 return -EFAULT;
2750 }
2751
2752 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2753 if (ret)
2754 return ret;
2755
2756 if (convert_out) {
2757 if (copy_in_user(compat_rxnfc, rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002758 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2759 (const void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002760 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2761 &rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002762 (const void __user *)(&rxnfc->fs.location + 1) -
2763 (const void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002764 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2765 sizeof(rxnfc->rule_cnt)))
2766 return -EFAULT;
2767
2768 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2769 /* As an optimisation, we only copy the actual
2770 * number of rules that the underlying
2771 * function returned. Since Mallory might
2772 * change the rule count in user memory, we
2773 * check that it is less than the rule count
2774 * originally given (as the user buffer size),
2775 * which has been range-checked.
2776 */
2777 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2778 return -EFAULT;
2779 if (actual_rule_cnt < rule_cnt)
2780 rule_cnt = actual_rule_cnt;
2781 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2782 &rxnfc->rule_locs[0],
2783 rule_cnt * sizeof(u32)))
2784 return -EFAULT;
2785 }
2786 }
2787
2788 return 0;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002789}
2790
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002791static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2792{
2793 void __user *uptr;
2794 compat_uptr_t uptr32;
2795 struct ifreq __user *uifr;
2796
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002797 uifr = compat_alloc_user_space(sizeof(*uifr));
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002798 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2799 return -EFAULT;
2800
2801 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2802 return -EFAULT;
2803
2804 uptr = compat_ptr(uptr32);
2805
2806 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2807 return -EFAULT;
2808
2809 return dev_ioctl(net, SIOCWANDEV, uifr);
2810}
2811
Arnd Bergmann6b960182009-11-06 23:10:54 -08002812static int bond_ioctl(struct net *net, unsigned int cmd,
2813 struct compat_ifreq __user *ifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002814{
2815 struct ifreq kifr;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002816 mm_segment_t old_fs;
2817 int err;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002818
2819 switch (cmd) {
2820 case SIOCBONDENSLAVE:
2821 case SIOCBONDRELEASE:
2822 case SIOCBONDSETHWADDR:
2823 case SIOCBONDCHANGEACTIVE:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002824 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002825 return -EFAULT;
2826
2827 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002828 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002829 err = dev_ioctl(net, cmd,
2830 (struct ifreq __user __force *) &kifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002831 set_fs(old_fs);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002832
2833 return err;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002834 default:
Linus Torvalds07d106d2012-01-05 15:40:12 -08002835 return -ENOIOCTLCMD;
Joe Perchesccbd6a52010-05-14 10:58:26 +00002836 }
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002837}
2838
Ben Hutchings590d4692013-11-18 17:04:13 +00002839/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
2840static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08002841 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002842{
2843 struct ifreq __user *u_ifreq64;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002844 char tmp_buf[IFNAMSIZ];
2845 void __user *data64;
2846 u32 data32;
2847
2848 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
2849 IFNAMSIZ))
2850 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00002851 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002852 return -EFAULT;
2853 data64 = compat_ptr(data32);
2854
2855 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
2856
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002857 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
2858 IFNAMSIZ))
2859 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00002860 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002861 return -EFAULT;
2862
Arnd Bergmann6b960182009-11-06 23:10:54 -08002863 return dev_ioctl(net, cmd, u_ifreq64);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002864}
2865
Arnd Bergmann6b960182009-11-06 23:10:54 -08002866static int dev_ifsioc(struct net *net, struct socket *sock,
2867 unsigned int cmd, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002868{
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002869 struct ifreq __user *uifr;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002870 int err;
2871
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002872 uifr = compat_alloc_user_space(sizeof(*uifr));
2873 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
2874 return -EFAULT;
2875
2876 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
2877
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002878 if (!err) {
2879 switch (cmd) {
2880 case SIOCGIFFLAGS:
2881 case SIOCGIFMETRIC:
2882 case SIOCGIFMTU:
2883 case SIOCGIFMEM:
2884 case SIOCGIFHWADDR:
2885 case SIOCGIFINDEX:
2886 case SIOCGIFADDR:
2887 case SIOCGIFBRDADDR:
2888 case SIOCGIFDSTADDR:
2889 case SIOCGIFNETMASK:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002890 case SIOCGIFPFLAGS:
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002891 case SIOCGIFTXQLEN:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002892 case SIOCGMIIPHY:
2893 case SIOCGMIIREG:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002894 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002895 err = -EFAULT;
2896 break;
2897 }
2898 }
2899 return err;
2900}
2901
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002902static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2903 struct compat_ifreq __user *uifr32)
2904{
2905 struct ifreq ifr;
2906 struct compat_ifmap __user *uifmap32;
2907 mm_segment_t old_fs;
2908 int err;
2909
2910 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2911 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002912 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2913 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2914 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2915 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
2916 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
2917 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002918 if (err)
2919 return -EFAULT;
2920
2921 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002922 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002923 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002924 set_fs(old_fs);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002925
2926 if (cmd == SIOCGIFMAP && !err) {
2927 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002928 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2929 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2930 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2931 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
2932 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
2933 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002934 if (err)
2935 err = -EFAULT;
2936 }
2937 return err;
2938}
2939
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002940struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002941 u32 rt_pad1;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002942 struct sockaddr rt_dst; /* target address */
2943 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
2944 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002945 unsigned short rt_flags;
2946 short rt_pad2;
2947 u32 rt_pad3;
2948 unsigned char rt_tos;
2949 unsigned char rt_class;
2950 short rt_pad4;
2951 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002952 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002953 u32 rt_mtu; /* per route MTU/Window */
2954 u32 rt_window; /* Window clamping */
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002955 unsigned short rt_irtt; /* Initial RTT */
2956};
2957
2958struct in6_rtmsg32 {
2959 struct in6_addr rtmsg_dst;
2960 struct in6_addr rtmsg_src;
2961 struct in6_addr rtmsg_gateway;
2962 u32 rtmsg_type;
2963 u16 rtmsg_dst_len;
2964 u16 rtmsg_src_len;
2965 u32 rtmsg_metric;
2966 u32 rtmsg_info;
2967 u32 rtmsg_flags;
2968 s32 rtmsg_ifindex;
2969};
2970
Arnd Bergmann6b960182009-11-06 23:10:54 -08002971static int routing_ioctl(struct net *net, struct socket *sock,
2972 unsigned int cmd, void __user *argp)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002973{
2974 int ret;
2975 void *r = NULL;
2976 struct in6_rtmsg r6;
2977 struct rtentry r4;
2978 char devname[16];
2979 u32 rtdev;
2980 mm_segment_t old_fs = get_fs();
2981
Arnd Bergmann6b960182009-11-06 23:10:54 -08002982 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
2983 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002984 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002985 3 * sizeof(struct in6_addr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002986 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
2987 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
2988 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
2989 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
2990 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
2991 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
2992 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002993
2994 r = (void *) &r6;
2995 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08002996 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002997 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002998 3 * sizeof(struct sockaddr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002999 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3000 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3001 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3002 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3003 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3004 ret |= get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003005 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003006 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003007 r4.rt_dev = (char __user __force *)devname;
3008 devname[15] = 0;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003009 } else
3010 r4.rt_dev = NULL;
3011
3012 r = (void *) &r4;
3013 }
3014
3015 if (ret) {
3016 ret = -EFAULT;
3017 goto out;
3018 }
3019
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003020 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003021 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003022 set_fs(old_fs);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003023
3024out:
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003025 return ret;
3026}
3027
3028/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3029 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003030 * use compatible ioctls
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003031 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003032static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003033{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003034 compat_ulong_t tmp;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003035
Arnd Bergmann6b960182009-11-06 23:10:54 -08003036 if (get_user(tmp, argp))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003037 return -EFAULT;
3038 if (tmp == BRCTL_GET_VERSION)
3039 return BRCTL_VERSION + 1;
3040 return -EINVAL;
3041}
3042
Arnd Bergmann6b960182009-11-06 23:10:54 -08003043static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3044 unsigned int cmd, unsigned long arg)
3045{
3046 void __user *argp = compat_ptr(arg);
3047 struct sock *sk = sock->sk;
3048 struct net *net = sock_net(sk);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003049
Arnd Bergmann6b960182009-11-06 23:10:54 -08003050 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003051 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003052
Arnd Bergmann6b960182009-11-06 23:10:54 -08003053 switch (cmd) {
3054 case SIOCSIFBR:
3055 case SIOCGIFBR:
3056 return old_bridge_ioctl(argp);
3057 case SIOCGIFNAME:
3058 return dev_ifname32(net, argp);
3059 case SIOCGIFCONF:
3060 return dev_ifconf(net, argp);
3061 case SIOCETHTOOL:
3062 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003063 case SIOCWANDEV:
3064 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003065 case SIOCGIFMAP:
3066 case SIOCSIFMAP:
3067 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003068 case SIOCBONDENSLAVE:
3069 case SIOCBONDRELEASE:
3070 case SIOCBONDSETHWADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003071 case SIOCBONDCHANGEACTIVE:
3072 return bond_ioctl(net, cmd, argp);
3073 case SIOCADDRT:
3074 case SIOCDELRT:
3075 return routing_ioctl(net, sock, cmd, argp);
3076 case SIOCGSTAMP:
3077 return do_siocgstamp(net, sock, cmd, argp);
3078 case SIOCGSTAMPNS:
3079 return do_siocgstampns(net, sock, cmd, argp);
Ben Hutchings590d4692013-11-18 17:04:13 +00003080 case SIOCBONDSLAVEINFOQUERY:
3081 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003082 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003083 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003084 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003085
Arnd Bergmann6b960182009-11-06 23:10:54 -08003086 case FIOSETOWN:
3087 case SIOCSPGRP:
3088 case FIOGETOWN:
3089 case SIOCGPGRP:
3090 case SIOCBRADDBR:
3091 case SIOCBRDELBR:
3092 case SIOCGIFVLAN:
3093 case SIOCSIFVLAN:
3094 case SIOCADDDLCI:
3095 case SIOCDELDLCI:
3096 return sock_ioctl(file, cmd, arg);
3097
3098 case SIOCGIFFLAGS:
3099 case SIOCSIFFLAGS:
3100 case SIOCGIFMETRIC:
3101 case SIOCSIFMETRIC:
3102 case SIOCGIFMTU:
3103 case SIOCSIFMTU:
3104 case SIOCGIFMEM:
3105 case SIOCSIFMEM:
3106 case SIOCGIFHWADDR:
3107 case SIOCSIFHWADDR:
3108 case SIOCADDMULTI:
3109 case SIOCDELMULTI:
3110 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003111 case SIOCGIFADDR:
3112 case SIOCSIFADDR:
3113 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003114 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003115 case SIOCGIFBRDADDR:
3116 case SIOCSIFBRDADDR:
3117 case SIOCGIFDSTADDR:
3118 case SIOCSIFDSTADDR:
3119 case SIOCGIFNETMASK:
3120 case SIOCSIFNETMASK:
3121 case SIOCSIFPFLAGS:
3122 case SIOCGIFPFLAGS:
3123 case SIOCGIFTXQLEN:
3124 case SIOCSIFTXQLEN:
3125 case SIOCBRADDIF:
3126 case SIOCBRDELIF:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003127 case SIOCSIFNAME:
3128 case SIOCGMIIPHY:
3129 case SIOCGMIIREG:
3130 case SIOCSMIIREG:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003131 return dev_ifsioc(net, sock, cmd, argp);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003132
Arnd Bergmann6b960182009-11-06 23:10:54 -08003133 case SIOCSARP:
3134 case SIOCGARP:
3135 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003136 case SIOCATMARK:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003137 return sock_do_ioctl(net, sock, cmd, arg);
3138 }
3139
Arnd Bergmann6b960182009-11-06 23:10:54 -08003140 return -ENOIOCTLCMD;
3141}
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003142
Eric Dumazet95c96172012-04-15 05:58:06 +00003143static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003144 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003145{
3146 struct socket *sock = file->private_data;
3147 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003148 struct sock *sk;
3149 struct net *net;
3150
3151 sk = sock->sk;
3152 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003153
3154 if (sock->ops->compat_ioctl)
3155 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3156
David S. Miller87de87d2008-06-03 09:14:03 -07003157 if (ret == -ENOIOCTLCMD &&
3158 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3159 ret = compat_wext_handle_ioctl(net, cmd, arg);
3160
Arnd Bergmann6b960182009-11-06 23:10:54 -08003161 if (ret == -ENOIOCTLCMD)
3162 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3163
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003164 return ret;
3165}
3166#endif
3167
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003168int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3169{
3170 return sock->ops->bind(sock, addr, addrlen);
3171}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003172EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003173
3174int kernel_listen(struct socket *sock, int backlog)
3175{
3176 return sock->ops->listen(sock, backlog);
3177}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003178EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003179
3180int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3181{
3182 struct sock *sk = sock->sk;
3183 int err;
3184
3185 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3186 newsock);
3187 if (err < 0)
3188 goto done;
3189
3190 err = sock->ops->accept(sock, *newsock, flags);
3191 if (err < 0) {
3192 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003193 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003194 goto done;
3195 }
3196
3197 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003198 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003199
3200done:
3201 return err;
3202}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003203EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003204
3205int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003206 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003207{
3208 return sock->ops->connect(sock, addr, addrlen, flags);
3209}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003210EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003211
3212int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3213 int *addrlen)
3214{
3215 return sock->ops->getname(sock, addr, addrlen, 0);
3216}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003217EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003218
3219int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3220 int *addrlen)
3221{
3222 return sock->ops->getname(sock, addr, addrlen, 1);
3223}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003224EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003225
3226int kernel_getsockopt(struct socket *sock, int level, int optname,
3227 char *optval, int *optlen)
3228{
3229 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003230 char __user *uoptval;
3231 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003232 int err;
3233
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003234 uoptval = (char __user __force *) optval;
3235 uoptlen = (int __user __force *) optlen;
3236
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003237 set_fs(KERNEL_DS);
3238 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003239 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003240 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003241 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3242 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003243 set_fs(oldfs);
3244 return err;
3245}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003246EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003247
3248int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003249 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003250{
3251 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003252 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003253 int err;
3254
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003255 uoptval = (char __user __force *) optval;
3256
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003257 set_fs(KERNEL_DS);
3258 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003259 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003260 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003261 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003262 optlen);
3263 set_fs(oldfs);
3264 return err;
3265}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003266EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003267
3268int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3269 size_t size, int flags)
3270{
3271 if (sock->ops->sendpage)
3272 return sock->ops->sendpage(sock, page, offset, size, flags);
3273
3274 return sock_no_sendpage(sock, page, offset, size, flags);
3275}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003276EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003277
3278int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3279{
3280 mm_segment_t oldfs = get_fs();
3281 int err;
3282
3283 set_fs(KERNEL_DS);
3284 err = sock->ops->ioctl(sock, cmd, arg);
3285 set_fs(oldfs);
3286
3287 return err;
3288}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003289EXPORT_SYMBOL(kernel_sock_ioctl);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003290
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003291int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3292{
3293 return sock->ops->shutdown(sock, how);
3294}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003295EXPORT_SYMBOL(kernel_sock_shutdown);