blob: 976f7324887b3b3203fe972447047c1ed805ee2b [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 = {
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200522 .getxattr = generic_getxattr,
Masatake YAMATO600e1772012-08-29 10:44:29 +0000523 .listxattr = sockfs_listxattr,
524};
525
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526/**
527 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700528 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 * Allocate a new inode and socket object. The two are bound together
530 * and initialised. The socket is then returned. If we are out of inodes
531 * NULL is returned.
532 */
533
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800534struct socket *sock_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700536 struct inode *inode;
537 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200539 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 if (!inode)
541 return NULL;
542
543 sock = SOCKET_I(inode);
544
Eric Dumazet29a020d2009-09-15 02:39:20 -0700545 kmemcheck_annotate_bitfield(sock, type);
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400546 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700547 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100548 inode->i_uid = current_fsuid();
549 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000550 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Alex Shi19e8d692012-05-14 14:15:31 -0700552 this_cpu_add(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 return sock;
554}
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800555EXPORT_SYMBOL(sock_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557/**
558 * sock_release - close a socket
559 * @sock: socket to close
560 *
561 * The socket is released from the protocol stack if it has a release
562 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700563 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700565
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566void sock_release(struct socket *sock)
567{
568 if (sock->ops) {
569 struct module *owner = sock->ops->owner;
570
571 sock->ops->release(sock);
572 sock->ops = NULL;
573 module_put(owner);
574 }
575
Eric Dumazeteaefd112011-02-18 03:26:36 +0000576 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800577 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Alex Shi19e8d692012-05-14 14:15:31 -0700579 this_cpu_sub(sockets_in_use, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 if (!sock->file) {
581 iput(SOCK_INODE(sock));
582 return;
583 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700584 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700586EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400588void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000589{
Eric Dumazet140c55d2014-08-06 11:49:29 +0200590 u8 flags = *tx_flags;
591
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400592 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200593 flags |= SKBTX_HW_TSTAMP;
594
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400595 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200596 flags |= SKBTX_SW_TSTAMP;
597
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400598 if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200599 flags |= SKBTX_SCHED_TSTAMP;
600
Eric Dumazet140c55d2014-08-06 11:49:29 +0200601 *tx_flags = flags;
Patrick Ohly20d49472009-02-12 05:03:38 +0000602}
Willem de Bruijn67cc0d42014-09-08 19:58:58 -0400603EXPORT_SYMBOL(__sock_tx_timestamp);
Patrick Ohly20d49472009-02-12 05:03:38 +0000604
Al Virod8725c82014-12-11 00:02:50 -0500605static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606{
Al Viro01e97e62014-12-15 21:39:31 -0500607 int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg));
Al Virod8725c82014-12-11 00:02:50 -0500608 BUG_ON(ret == -EIOCBQUEUED);
609 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610}
Gu Zheng0cf00c62014-12-05 15:14:23 +0800611
Al Virod8725c82014-12-11 00:02:50 -0500612int sock_sendmsg(struct socket *sock, struct msghdr *msg)
Gu Zheng0cf00c62014-12-05 15:14:23 +0800613{
Al Virod8725c82014-12-11 00:02:50 -0500614 int err = security_socket_sendmsg(sock, msg,
Al Viro01e97e62014-12-15 21:39:31 -0500615 msg_data_left(msg));
Ying Xue1b784142015-03-02 15:37:48 +0800616
Al Virod8725c82014-12-11 00:02:50 -0500617 return err ?: sock_sendmsg_nosec(sock, msg);
Gu Zheng0cf00c62014-12-05 15:14:23 +0800618}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700619EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
621int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
622 struct kvec *vec, size_t num, size_t size)
623{
Al Viro6aa24812015-03-21 19:56:16 -0400624 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size);
Al Virod8725c82014-12-11 00:02:50 -0500625 return sock_sendmsg(sock, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700627EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700629/*
630 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
631 */
632void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
633 struct sk_buff *skb)
634{
Patrick Ohly20d49472009-02-12 05:03:38 +0000635 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400636 struct scm_timestamping tss;
Patrick Ohly20d49472009-02-12 05:03:38 +0000637 int empty = 1;
638 struct skb_shared_hwtstamps *shhwtstamps =
639 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700640
Patrick Ohly20d49472009-02-12 05:03:38 +0000641 /* Race occurred between timestamp enabling and packet
642 receiving. Fill in the current time for now. */
643 if (need_software_tstamp && skb->tstamp.tv64 == 0)
644 __net_timestamp(skb);
645
646 if (need_software_tstamp) {
647 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
648 struct timeval tv;
649 skb_get_timestamp(skb, &tv);
650 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
651 sizeof(tv), &tv);
652 } else {
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400653 struct timespec ts;
654 skb_get_timestampns(skb, &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000655 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400656 sizeof(ts), &ts);
Patrick Ohly20d49472009-02-12 05:03:38 +0000657 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700658 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000659
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400660 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400661 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400662 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000663 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400664 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400665 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400666 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2))
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400667 empty = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000668 if (!empty)
669 put_cmsg(msg, SOL_SOCKET,
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400670 SCM_TIMESTAMPING, sizeof(tss), &tss);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700671}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300672EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
673
Johannes Berg6e3e9392011-11-09 10:15:42 +0100674void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
675 struct sk_buff *skb)
676{
677 int ack;
678
679 if (!sock_flag(sk, SOCK_WIFI_STATUS))
680 return;
681 if (!skb->wifi_acked_valid)
682 return;
683
684 ack = skb->wifi_acked;
685
686 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
687}
688EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
689
stephen hemminger11165f12010-10-18 14:27:29 +0000690static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
691 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700692{
Eyal Birger744d5a32015-03-01 14:58:31 +0200693 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
Neil Horman3b885782009-10-12 13:26:31 -0700694 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
Eyal Birger744d5a32015-03-01 14:58:31 +0200695 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
Neil Horman3b885782009-10-12 13:26:31 -0700696}
697
Eric Dumazet767dd032010-04-28 19:14:43 +0000698void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700699 struct sk_buff *skb)
700{
701 sock_recv_timestamp(msg, sk, skb);
702 sock_recv_drops(msg, sk, skb);
703}
Eric Dumazet767dd032010-04-28 19:14:43 +0000704EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700705
Ying Xue1b784142015-03-02 15:37:48 +0800706static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
Al Viro2da62902015-03-14 21:13:46 -0400707 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708{
Al Viro2da62902015-03-14 21:13:46 -0400709 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710}
711
Al Viro2da62902015-03-14 21:13:46 -0400712int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700713{
Al Viro2da62902015-03-14 21:13:46 -0400714 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700715
Al Viro2da62902015-03-14 21:13:46 -0400716 return err ?: sock_recvmsg_nosec(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700718EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
Martin Lucinac1249c02010-12-10 00:04:05 +0000720/**
721 * kernel_recvmsg - Receive a message from a socket (kernel space)
722 * @sock: The socket to receive the message from
723 * @msg: Received message
724 * @vec: Input s/g array for message data
725 * @num: Size of input s/g array
726 * @size: Number of bytes to read
727 * @flags: Message flags (MSG_DONTWAIT, etc...)
728 *
729 * On return the msg structure contains the scatter/gather array passed in the
730 * vec argument. The array is modified so that it consists of the unfilled
731 * portion of the original array.
732 *
733 * The returned value is the total number of bytes received, or an error.
734 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700735int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
736 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737{
738 mm_segment_t oldfs = get_fs();
739 int result;
740
Al Viro6aa24812015-03-21 19:56:16 -0400741 iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 set_fs(KERNEL_DS);
Al Viro2da62902015-03-14 21:13:46 -0400743 result = sock_recvmsg(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 set_fs(oldfs);
745 return result;
746}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700747EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300749static ssize_t sock_sendpage(struct file *file, struct page *page,
750 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751{
752 struct socket *sock;
753 int flags;
754
Eric Dumazetb69aee02005-09-06 14:42:45 -0700755 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
Eric Dumazet35f9c092012-04-05 03:05:35 +0000757 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
758 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
759 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Linus Torvaldse6949582009-08-13 08:28:36 -0700761 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762}
763
Jens Axboe9c55e012007-11-06 23:30:13 -0800764static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700765 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800766 unsigned int flags)
767{
768 struct socket *sock = file->private_data;
769
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800770 if (unlikely(!sock->ops->splice_read))
771 return -EINVAL;
772
Jens Axboe9c55e012007-11-06 23:30:13 -0800773 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
774}
775
Al Viro8ae5e032014-11-28 19:40:50 -0500776static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800777{
Al Viro6d652332015-01-30 16:12:56 -0500778 struct file *file = iocb->ki_filp;
779 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700780 struct msghdr msg = {.msg_iter = *to,
781 .msg_iocb = iocb};
Al Viro8ae5e032014-11-28 19:40:50 -0500782 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800783
Al Viro8ae5e032014-11-28 19:40:50 -0500784 if (file->f_flags & O_NONBLOCK)
785 msg.msg_flags = MSG_DONTWAIT;
786
787 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800788 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700789
Christoph Hellwig66ee59a2015-02-11 19:56:46 +0100790 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800791 return 0;
792
Al Viro2da62902015-03-14 21:13:46 -0400793 res = sock_recvmsg(sock, &msg, msg.msg_flags);
Al Viro8ae5e032014-11-28 19:40:50 -0500794 *to = msg.msg_iter;
795 return res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800796}
797
Al Viro8ae5e032014-11-28 19:40:50 -0500798static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799{
Al Viro6d652332015-01-30 16:12:56 -0500800 struct file *file = iocb->ki_filp;
801 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700802 struct msghdr msg = {.msg_iter = *from,
803 .msg_iocb = iocb};
Al Viro8ae5e032014-11-28 19:40:50 -0500804 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800805
Al Viro8ae5e032014-11-28 19:40:50 -0500806 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800807 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700808
Al Viro8ae5e032014-11-28 19:40:50 -0500809 if (file->f_flags & O_NONBLOCK)
810 msg.msg_flags = MSG_DONTWAIT;
811
Al Viro6d652332015-01-30 16:12:56 -0500812 if (sock->type == SOCK_SEQPACKET)
813 msg.msg_flags |= MSG_EOR;
814
Al Virod8725c82014-12-11 00:02:50 -0500815 res = sock_sendmsg(sock, &msg);
Al Viro8ae5e032014-11-28 19:40:50 -0500816 *from = msg.msg_iter;
817 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818}
819
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820/*
821 * Atomic setting of ioctl hooks to avoid race
822 * with module unload.
823 */
824
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800825static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700826static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
Eric W. Biederman881d9662007-09-17 11:56:21 -0700828void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800830 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800832 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833}
834EXPORT_SYMBOL(brioctl_set);
835
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800836static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700837static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
Eric W. Biederman881d9662007-09-17 11:56:21 -0700839void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800841 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800843 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844}
845EXPORT_SYMBOL(vlan_ioctl_set);
846
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800847static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700848static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700850void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800852 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800854 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855}
856EXPORT_SYMBOL(dlci_ioctl_set);
857
Arnd Bergmann6b960182009-11-06 23:10:54 -0800858static long sock_do_ioctl(struct net *net, struct socket *sock,
859 unsigned int cmd, unsigned long arg)
860{
861 int err;
862 void __user *argp = (void __user *)arg;
863
864 err = sock->ops->ioctl(sock, cmd, arg);
865
866 /*
867 * If this ioctl is unknown try to hand it down
868 * to the NIC driver.
869 */
870 if (err == -ENOIOCTLCMD)
871 err = dev_ioctl(net, cmd, argp);
872
873 return err;
874}
875
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876/*
877 * With an ioctl, arg may well be a user mode pointer, but we don't know
878 * what to do with it - that's up to the protocol still.
879 */
880
881static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
882{
883 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700884 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 void __user *argp = (void __user *)arg;
886 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700887 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
Eric Dumazetb69aee02005-09-06 14:42:45 -0700889 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700890 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900891 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700893 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 } else
Johannes Berg3d23e342009-09-29 23:27:28 +0200895#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700897 err = dev_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 } else
Johannes Berg3d23e342009-09-29 23:27:28 +0200899#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700900 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 case FIOSETOWN:
902 case SIOCSPGRP:
903 err = -EFAULT;
904 if (get_user(pid, (int __user *)argp))
905 break;
Jeff Laytone0b93ed2014-08-22 11:27:32 -0400906 f_setown(sock->file, pid, 1);
907 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 break;
909 case FIOGETOWN:
910 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700911 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700912 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 break;
914 case SIOCGIFBR:
915 case SIOCSIFBR:
916 case SIOCBRADDBR:
917 case SIOCBRDELBR:
918 err = -ENOPKG;
919 if (!br_ioctl_hook)
920 request_module("bridge");
921
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800922 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700923 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700924 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800925 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 break;
927 case SIOCGIFVLAN:
928 case SIOCSIFVLAN:
929 err = -ENOPKG;
930 if (!vlan_ioctl_hook)
931 request_module("8021q");
932
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800933 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700935 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800936 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 case SIOCADDDLCI:
939 case SIOCDELDLCI:
940 err = -ENOPKG;
941 if (!dlci_ioctl_hook)
942 request_module("dlci");
943
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -0700944 mutex_lock(&dlci_ioctl_mutex);
945 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -0700947 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 break;
949 default:
Arnd Bergmann6b960182009-11-06 23:10:54 -0800950 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700952 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 return err;
954}
955
956int sock_create_lite(int family, int type, int protocol, struct socket **res)
957{
958 int err;
959 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700960
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 err = security_socket_create(family, type, protocol, 1);
962 if (err)
963 goto out;
964
965 sock = sock_alloc();
966 if (!sock) {
967 err = -ENOMEM;
968 goto out;
969 }
970
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -0700972 err = security_socket_post_create(sock, family, type, protocol, 1);
973 if (err)
974 goto out_release;
975
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976out:
977 *res = sock;
978 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -0700979out_release:
980 sock_release(sock);
981 sock = NULL;
982 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700984EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
986/* No kernel lock held - perfect */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700987static unsigned int sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988{
Eliezer Tamircbf55002013-07-08 16:20:34 +0300989 unsigned int busy_flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 struct socket *sock;
991
992 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700993 * We can't return errors to poll, so it's either yes or no.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 */
Eric Dumazetb69aee02005-09-06 14:42:45 -0700995 sock = file->private_data;
Eliezer Tamir2d48d672013-06-24 10:28:03 +0300996
Eliezer Tamircbf55002013-07-08 16:20:34 +0300997 if (sk_can_busy_loop(sock->sk)) {
Eliezer Tamir2d48d672013-06-24 10:28:03 +0300998 /* this socket can poll_ll so tell the system call */
Eliezer Tamircbf55002013-07-08 16:20:34 +0300999 busy_flag = POLL_BUSY_LOOP;
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001000
1001 /* once, only if requested by syscall */
Eliezer Tamircbf55002013-07-08 16:20:34 +03001002 if (wait && (wait->_key & POLL_BUSY_LOOP))
1003 sk_busy_loop(sock->sk, 1);
Eliezer Tamir2d48d672013-06-24 10:28:03 +03001004 }
1005
Eliezer Tamircbf55002013-07-08 16:20:34 +03001006 return busy_flag | sock->ops->poll(file, sock, wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007}
1008
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001009static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001011 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
1013 return sock->ops->mmap(file, sock, vma);
1014}
1015
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001016static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 sock_release(SOCKET_I(inode));
1019 return 0;
1020}
1021
1022/*
1023 * Update the socket async list
1024 *
1025 * Fasync_list locking strategy.
1026 *
1027 * 1. fasync_list is modified only under process context socket lock
1028 * i.e. under semaphore.
1029 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001030 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 */
1032
1033static int sock_fasync(int fd, struct file *filp, int on)
1034{
Eric Dumazet989a2972010-04-14 09:55:35 +00001035 struct socket *sock = filp->private_data;
1036 struct sock *sk = sock->sk;
Eric Dumazeteaefd112011-02-18 03:26:36 +00001037 struct socket_wq *wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038
Eric Dumazet989a2972010-04-14 09:55:35 +00001039 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041
1042 lock_sock(sk);
Hannes Frederic Sowa1e1d04e2016-04-05 17:10:15 +02001043 wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk));
Eric Dumazeteaefd112011-02-18 03:26:36 +00001044 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
Eric Dumazeteaefd112011-02-18 03:26:36 +00001046 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001047 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001048 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001049 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050
Eric Dumazet989a2972010-04-14 09:55:35 +00001051 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 return 0;
1053}
1054
Eric Dumazetceb5d582015-11-29 20:03:11 -08001055/* This function may be called only under rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056
Eric Dumazetceb5d582015-11-29 20:03:11 -08001057int sock_wake_async(struct socket_wq *wq, int how, int band)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058{
Eric Dumazetceb5d582015-11-29 20:03:11 -08001059 if (!wq || !wq->fasync_list)
1060 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001061
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001062 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001063 case SOCK_WAKE_WAITD:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001064 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 break;
1066 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001067 case SOCK_WAKE_SPACE:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001068 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 break;
1070 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001071 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001072call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001073 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001075 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001076 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08001078
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 return 0;
1080}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001081EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082
Pavel Emelyanov721db932010-09-29 16:06:32 +04001083int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001084 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085{
1086 int err;
1087 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001088 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089
1090 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001091 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 */
1093 if (family < 0 || family >= NPROTO)
1094 return -EAFNOSUPPORT;
1095 if (type < 0 || type >= SOCK_MAX)
1096 return -EINVAL;
1097
1098 /* Compatibility.
1099
1100 This uglymoron is moved from INET layer to here to avoid
1101 deadlock in module load.
1102 */
1103 if (family == PF_INET && type == SOCK_PACKET) {
liping.zhangf3c98692016-03-11 23:08:36 +08001104 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1105 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 family = PF_PACKET;
1107 }
1108
1109 err = security_socket_create(family, type, protocol, kern);
1110 if (err)
1111 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001112
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001113 /*
1114 * Allocate the socket and allow the family to set things up. if
1115 * the protocol is 0, the family is instructed to select an appropriate
1116 * default.
1117 */
1118 sock = sock_alloc();
1119 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001120 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001121 return -ENFILE; /* Not exactly a match, but its the
1122 closest posix thing */
1123 }
1124
1125 sock->type = type;
1126
Johannes Berg95a5afc2008-10-16 15:24:51 -07001127#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001128 /* Attempt to load a protocol module if the find failed.
1129 *
1130 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 * requested real, full-featured networking support upon configuration.
1132 * Otherwise module support will break!
1133 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001134 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001135 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136#endif
1137
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001138 rcu_read_lock();
1139 pf = rcu_dereference(net_families[family]);
1140 err = -EAFNOSUPPORT;
1141 if (!pf)
1142 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143
1144 /*
1145 * We will call the ->create function, that possibly is in a loadable
1146 * module, so we have to bump that loadable module refcnt first.
1147 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001148 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 goto out_release;
1150
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001151 /* Now protected by module ref count */
1152 rcu_read_unlock();
1153
Eric Paris3f378b62009-11-05 22:18:14 -08001154 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001155 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001157
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 /*
1159 * Now to bump the refcnt of the [loadable] module that owns this
1160 * socket at sock_release time we decrement its refcnt.
1161 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001162 if (!try_module_get(sock->ops->owner))
1163 goto out_module_busy;
1164
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 /*
1166 * Now that we're done with the ->create function, the [loadable]
1167 * module can have its refcnt decremented
1168 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001169 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001170 err = security_socket_post_create(sock, family, type, protocol, kern);
1171 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001172 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001173 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001175 return 0;
1176
1177out_module_busy:
1178 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001180 sock->ops = NULL;
1181 module_put(pf->owner);
1182out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001184 return err;
1185
1186out_release:
1187 rcu_read_unlock();
1188 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001190EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191
1192int sock_create(int family, int type, int protocol, struct socket **res)
1193{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001194 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001196EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001198int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199{
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001200 return __sock_create(net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001202EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001204SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205{
1206 int retval;
1207 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001208 int flags;
1209
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001210 /* Check the SOCK_* constants for consistency. */
1211 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1212 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1213 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1214 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1215
Ulrich Dreppera677a032008-07-23 21:29:17 -07001216 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001217 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001218 return -EINVAL;
1219 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001221 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1222 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1223
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 retval = sock_create(family, type, protocol, &sock);
1225 if (retval < 0)
1226 goto out;
1227
Ulrich Drepper77d27202008-07-23 21:29:35 -07001228 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 if (retval < 0)
1230 goto out_release;
1231
1232out:
1233 /* It may be already another descriptor 8) Not kernel problem. */
1234 return retval;
1235
1236out_release:
1237 sock_release(sock);
1238 return retval;
1239}
1240
1241/*
1242 * Create a pair of connected sockets.
1243 */
1244
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001245SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1246 int __user *, usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247{
1248 struct socket *sock1, *sock2;
1249 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001250 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001251 int flags;
1252
1253 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001254 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001255 return -EINVAL;
1256 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001258 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1259 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1260
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 /*
1262 * Obtain the first socket and check if the underlying protocol
1263 * supports the socketpair call.
1264 */
1265
1266 err = sock_create(family, type, protocol, &sock1);
1267 if (err < 0)
1268 goto out;
1269
1270 err = sock_create(family, type, protocol, &sock2);
1271 if (err < 0)
1272 goto out_release_1;
1273
1274 err = sock1->ops->socketpair(sock1, sock2);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001275 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 goto out_release_both;
1277
Al Viro28407632012-08-17 23:54:15 -04001278 fd1 = get_unused_fd_flags(flags);
David S. Millerbf3c23d2007-10-29 21:54:02 -07001279 if (unlikely(fd1 < 0)) {
1280 err = fd1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 goto out_release_both;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001282 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001283
Al Viro28407632012-08-17 23:54:15 -04001284 fd2 = get_unused_fd_flags(flags);
Al Viro198de4d2009-08-05 19:29:23 +04001285 if (unlikely(fd2 < 0)) {
1286 err = fd2;
Yann Droneaudd73aa282013-12-09 22:42:20 +01001287 goto out_put_unused_1;
Al Viro28407632012-08-17 23:54:15 -04001288 }
1289
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001290 newfile1 = sock_alloc_file(sock1, flags, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301291 if (IS_ERR(newfile1)) {
Al Viro28407632012-08-17 23:54:15 -04001292 err = PTR_ERR(newfile1);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001293 goto out_put_unused_both;
Al Viro28407632012-08-17 23:54:15 -04001294 }
1295
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001296 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001297 if (IS_ERR(newfile2)) {
1298 err = PTR_ERR(newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001299 goto out_fput_1;
Al Virodb349502007-02-07 01:48:00 -05001300 }
1301
Yann Droneaudd73aa282013-12-09 22:42:20 +01001302 err = put_user(fd1, &usockvec[0]);
1303 if (err)
1304 goto out_fput_both;
1305
1306 err = put_user(fd2, &usockvec[1]);
1307 if (err)
1308 goto out_fput_both;
1309
Al Viro157cf642008-12-14 04:57:47 -05001310 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001311
Al Virodb349502007-02-07 01:48:00 -05001312 fd_install(fd1, newfile1);
1313 fd_install(fd2, newfile2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 /* fd1 and fd2 may be already another descriptors.
1315 * Not kernel problem.
1316 */
1317
Yann Droneaudd73aa282013-12-09 22:42:20 +01001318 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319
Yann Droneaudd73aa282013-12-09 22:42:20 +01001320out_fput_both:
1321 fput(newfile2);
1322 fput(newfile1);
1323 put_unused_fd(fd2);
1324 put_unused_fd(fd1);
1325 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326
Yann Droneaudd73aa282013-12-09 22:42:20 +01001327out_fput_1:
1328 fput(newfile1);
1329 put_unused_fd(fd2);
1330 put_unused_fd(fd1);
1331 sock_release(sock2);
1332 goto out;
1333
1334out_put_unused_both:
1335 put_unused_fd(fd2);
1336out_put_unused_1:
1337 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338out_release_both:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001339 sock_release(sock2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340out_release_1:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001341 sock_release(sock1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342out:
1343 return err;
1344}
1345
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346/*
1347 * Bind a name to a socket. Nothing much to do here since it's
1348 * the protocol's responsibility to handle the local address.
1349 *
1350 * We move the socket address to kernel space before we call
1351 * the protocol layer (having also checked the address is ok).
1352 */
1353
Heiko Carstens20f37032009-01-14 14:14:23 +01001354SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355{
1356 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001357 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001358 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001360 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001361 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001362 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001363 if (err >= 0) {
1364 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001365 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001366 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001367 if (!err)
1368 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001369 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001370 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001372 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001373 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 return err;
1375}
1376
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377/*
1378 * Perform a listen. Basically, we allow the protocol to do anything
1379 * necessary for a listen, and if that works, we mark the socket as
1380 * ready for listening.
1381 */
1382
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001383SYSCALL_DEFINE2(listen, int, fd, int, backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384{
1385 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001386 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001387 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001388
1389 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1390 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001391 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001392 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001393 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394
1395 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001396 if (!err)
1397 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001399 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 }
1401 return err;
1402}
1403
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404/*
1405 * For accept, we attempt to create a new socket, set up the link
1406 * with the client, wake up the client, then return the new
1407 * connected fd. We collect the address of the connector in kernel
1408 * space and move it to user at the very end. This is unclean because
1409 * we open the socket then return an error.
1410 *
1411 * 1003.1g adds the ability to recvmsg() to query connection pending
1412 * status to recvmsg. We need to add that support in a way thats
1413 * clean when we restucture accept also.
1414 */
1415
Heiko Carstens20f37032009-01-14 14:14:23 +01001416SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1417 int __user *, upeer_addrlen, int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418{
1419 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001420 struct file *newfile;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001421 int err, len, newfd, fput_needed;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001422 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423
Ulrich Drepper77d27202008-07-23 21:29:35 -07001424 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001425 return -EINVAL;
1426
1427 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1428 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1429
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001430 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 if (!sock)
1432 goto out;
1433
1434 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001435 newsock = sock_alloc();
1436 if (!newsock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 goto out_put;
1438
1439 newsock->type = sock->type;
1440 newsock->ops = sock->ops;
1441
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 /*
1443 * We don't need try_module_get here, as the listening socket (sock)
1444 * has the protocol module (sock->ops->owner) held.
1445 */
1446 __module_get(newsock->ops->owner);
1447
Al Viro28407632012-08-17 23:54:15 -04001448 newfd = get_unused_fd_flags(flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001449 if (unlikely(newfd < 0)) {
1450 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001451 sock_release(newsock);
1452 goto out_put;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001453 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001454 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301455 if (IS_ERR(newfile)) {
Al Viro28407632012-08-17 23:54:15 -04001456 err = PTR_ERR(newfile);
1457 put_unused_fd(newfd);
1458 sock_release(newsock);
1459 goto out_put;
1460 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001461
Frank Filza79af592005-09-27 15:23:38 -07001462 err = security_socket_accept(sock, newsock);
1463 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001464 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001465
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1467 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001468 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469
1470 if (upeer_sockaddr) {
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001471 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001472 &len, 2) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001474 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001476 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001477 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001479 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 }
1481
1482 /* File flags are not inherited via accept() unlike another OSes. */
1483
David S. Miller39d8c1b2006-03-20 17:13:49 -08001484 fd_install(newfd, newfile);
1485 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001488 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489out:
1490 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001491out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001492 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001493 put_unused_fd(newfd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494 goto out_put;
1495}
1496
Heiko Carstens20f37032009-01-14 14:14:23 +01001497SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1498 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001499{
Ulrich Drepperde11def2008-11-19 15:36:14 -08001500 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001501}
1502
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503/*
1504 * Attempt to connect to a socket with the server address. The address
1505 * is in user space so we verify it is OK and move it to kernel space.
1506 *
1507 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1508 * break bindings
1509 *
1510 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1511 * other SEQPACKET protocols that take time to connect() as it doesn't
1512 * include the -EINPROGRESS status for such sockets.
1513 */
1514
Heiko Carstens20f37032009-01-14 14:14:23 +01001515SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1516 int, addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517{
1518 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001519 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001520 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001522 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523 if (!sock)
1524 goto out;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001525 err = move_addr_to_kernel(uservaddr, addrlen, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 if (err < 0)
1527 goto out_put;
1528
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001529 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001530 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 if (err)
1532 goto out_put;
1533
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001534 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535 sock->file->f_flags);
1536out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001537 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538out:
1539 return err;
1540}
1541
1542/*
1543 * Get the local address ('name') of a socket object. Move the obtained
1544 * name to user space.
1545 */
1546
Heiko Carstens20f37032009-01-14 14:14:23 +01001547SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1548 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549{
1550 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001551 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001552 int len, err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001553
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001554 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 if (!sock)
1556 goto out;
1557
1558 err = security_socket_getsockname(sock);
1559 if (err)
1560 goto out_put;
1561
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001562 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 if (err)
1564 goto out_put;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001565 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566
1567out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001568 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569out:
1570 return err;
1571}
1572
1573/*
1574 * Get the remote address ('name') of a socket object. Move the obtained
1575 * name to user space.
1576 */
1577
Heiko Carstens20f37032009-01-14 14:14:23 +01001578SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1579 int __user *, usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580{
1581 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001582 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001583 int len, err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001585 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1586 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 err = security_socket_getpeername(sock);
1588 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001589 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590 return err;
1591 }
1592
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001593 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001594 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001595 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596 if (!err)
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001597 err = move_addr_to_user(&address, len, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001598 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001599 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 }
1601 return err;
1602}
1603
1604/*
1605 * Send a datagram to a given address. We move the address into kernel
1606 * space and check the user space data area is readable before invoking
1607 * the protocol.
1608 */
1609
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001610SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001611 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001612 int, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613{
1614 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001615 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 int err;
1617 struct msghdr msg;
1618 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001619 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001620
Al Viro602bd0e2015-03-21 19:12:32 -04001621 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
1622 if (unlikely(err))
1623 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001624 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1625 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001626 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001627
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001628 msg.msg_name = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001629 msg.msg_control = NULL;
1630 msg.msg_controllen = 0;
1631 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001632 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001633 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 if (err < 0)
1635 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001636 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001637 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 }
1639 if (sock->file->f_flags & O_NONBLOCK)
1640 flags |= MSG_DONTWAIT;
1641 msg.msg_flags = flags;
Al Virod8725c82014-12-11 00:02:50 -05001642 err = sock_sendmsg(sock, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001644out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001645 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001646out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 return err;
1648}
1649
1650/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001651 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652 */
1653
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001654SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001655 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656{
1657 return sys_sendto(fd, buff, len, flags, NULL, 0);
1658}
1659
1660/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001661 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662 * sender. We verify the buffers are writable and if needed move the
1663 * sender address from kernel to user space.
1664 */
1665
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001666SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
Eric Dumazet95c96172012-04-15 05:58:06 +00001667 unsigned int, flags, struct sockaddr __user *, addr,
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001668 int __user *, addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669{
1670 struct socket *sock;
1671 struct iovec iov;
1672 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001673 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001674 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001675 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676
Al Viro602bd0e2015-03-21 19:12:32 -04001677 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
1678 if (unlikely(err))
1679 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001680 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001682 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001684 msg.msg_control = NULL;
1685 msg.msg_controllen = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01001686 /* Save some cycles and don't copy the address if not needed */
1687 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1688 /* We assume all kernel code knows the size of sockaddr_storage */
1689 msg.msg_namelen = 0;
tadeusz.struk@intel.com130ed5d2015-12-15 10:46:17 -08001690 msg.msg_iocb = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 if (sock->file->f_flags & O_NONBLOCK)
1692 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04001693 err = sock_recvmsg(sock, &msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001695 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001696 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001697 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001698 if (err2 < 0)
1699 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001701
1702 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001703out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 return err;
1705}
1706
1707/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001708 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 */
1710
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02001711SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1712 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713{
1714 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1715}
1716
1717/*
1718 * Set a socket option. Because we don't know the option lengths we have
1719 * to pass the user mode parameter for the protocols to sort out.
1720 */
1721
Heiko Carstens20f37032009-01-14 14:14:23 +01001722SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1723 char __user *, optval, int, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001725 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726 struct socket *sock;
1727
1728 if (optlen < 0)
1729 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001730
1731 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1732 if (sock != NULL) {
1733 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001734 if (err)
1735 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736
1737 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001738 err =
1739 sock_setsockopt(sock, level, optname, optval,
1740 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001742 err =
1743 sock->ops->setsockopt(sock, level, optname, optval,
1744 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001745out_put:
1746 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747 }
1748 return err;
1749}
1750
1751/*
1752 * Get a socket option. Because we don't know the option lengths we have
1753 * to pass a user mode parameter for the protocols to sort out.
1754 */
1755
Heiko Carstens20f37032009-01-14 14:14:23 +01001756SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1757 char __user *, optval, int __user *, optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001759 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760 struct socket *sock;
1761
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001762 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1763 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001764 err = security_socket_getsockopt(sock, level, optname);
1765 if (err)
1766 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767
1768 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001769 err =
1770 sock_getsockopt(sock, level, optname, optval,
1771 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001773 err =
1774 sock->ops->getsockopt(sock, level, optname, optval,
1775 optlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001776out_put:
1777 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778 }
1779 return err;
1780}
1781
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782/*
1783 * Shutdown a socket.
1784 */
1785
Heiko Carstens754fe8d2009-01-14 14:14:09 +01001786SYSCALL_DEFINE2(shutdown, int, fd, int, how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001787{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001788 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 struct socket *sock;
1790
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001791 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1792 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001794 if (!err)
1795 err = sock->ops->shutdown(sock, how);
1796 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797 }
1798 return err;
1799}
1800
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001801/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802 * fields which are the same type (int / unsigned) on our platforms.
1803 */
1804#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1805#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1806#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1807
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001808struct used_address {
1809 struct sockaddr_storage name;
1810 unsigned int name_len;
1811};
1812
Al Viroda184282015-03-21 19:29:06 -04001813static int copy_msghdr_from_user(struct msghdr *kmsg,
1814 struct user_msghdr __user *umsg,
1815 struct sockaddr __user **save_addr,
1816 struct iovec **iov)
Dan Carpenter1661bf32013-10-03 00:27:20 +03001817{
Al Viro08adb7d2014-11-10 20:23:13 -05001818 struct sockaddr __user *uaddr;
1819 struct iovec __user *uiov;
Al Viroc0371da2014-11-24 10:42:55 -05001820 size_t nr_segs;
Al Viro08adb7d2014-11-10 20:23:13 -05001821 ssize_t err;
1822
1823 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
1824 __get_user(uaddr, &umsg->msg_name) ||
1825 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
1826 __get_user(uiov, &umsg->msg_iov) ||
Al Viroc0371da2014-11-24 10:42:55 -05001827 __get_user(nr_segs, &umsg->msg_iovlen) ||
Al Viro08adb7d2014-11-10 20:23:13 -05001828 __get_user(kmsg->msg_control, &umsg->msg_control) ||
1829 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
1830 __get_user(kmsg->msg_flags, &umsg->msg_flags))
Dan Carpenter1661bf32013-10-03 00:27:20 +03001831 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00001832
Al Viro08adb7d2014-11-10 20:23:13 -05001833 if (!uaddr)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07001834 kmsg->msg_namelen = 0;
1835
Matthew Leachdbb490b2014-03-11 11:58:27 +00001836 if (kmsg->msg_namelen < 0)
1837 return -EINVAL;
1838
Dan Carpenter1661bf32013-10-03 00:27:20 +03001839 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03001840 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05001841
1842 if (save_addr)
1843 *save_addr = uaddr;
1844
1845 if (uaddr && kmsg->msg_namelen) {
1846 if (!save_addr) {
1847 err = move_addr_to_kernel(uaddr, kmsg->msg_namelen,
1848 kmsg->msg_name);
1849 if (err < 0)
1850 return err;
1851 }
1852 } else {
1853 kmsg->msg_name = NULL;
1854 kmsg->msg_namelen = 0;
1855 }
1856
Al Viroc0371da2014-11-24 10:42:55 -05001857 if (nr_segs > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05001858 return -EMSGSIZE;
1859
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07001860 kmsg->msg_iocb = NULL;
1861
Al Viroda184282015-03-21 19:29:06 -04001862 return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs,
1863 UIO_FASTIOV, iov, &kmsg->msg_iter);
Dan Carpenter1661bf32013-10-03 00:27:20 +03001864}
1865
Al Viro666547f2014-04-06 14:03:05 -04001866static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00001867 struct msghdr *msg_sys, unsigned int flags,
Tom Herbert28a94d82016-03-07 14:11:02 -08001868 struct used_address *used_address,
1869 unsigned int allowed_msghdr_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001871 struct compat_msghdr __user *msg_compat =
1872 (struct compat_msghdr __user *)msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001873 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07001875 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001876 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1877 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878 unsigned char *ctl_buf = ctl;
Al Virod8725c82014-12-11 00:02:50 -05001879 int ctl_len;
Al Viro08adb7d2014-11-10 20:23:13 -05001880 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001881
Al Viro08adb7d2014-11-10 20:23:13 -05001882 msg_sys->msg_name = &address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883
Al Viro08449322014-11-09 22:33:45 -05001884 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05001885 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
Al Viro08449322014-11-09 22:33:45 -05001886 else
Al Viro08adb7d2014-11-10 20:23:13 -05001887 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001888 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04001889 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890
1891 err = -ENOBUFS;
1892
Anton Blanchard228e5482011-05-02 20:21:35 +00001893 if (msg_sys->msg_controllen > INT_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 goto out_freeiov;
Tom Herbert28a94d82016-03-07 14:11:02 -08001895 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
Anton Blanchard228e5482011-05-02 20:21:35 +00001896 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001898 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00001899 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001900 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 if (err)
1902 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00001903 ctl_buf = msg_sys->msg_control;
1904 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 } else if (ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001906 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001908 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 goto out_freeiov;
1910 }
1911 err = -EFAULT;
1912 /*
Anton Blanchard228e5482011-05-02 20:21:35 +00001913 * Careful! Before this, msg_sys->msg_control contains a user pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1915 * checking falls down on this.
1916 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00001917 if (copy_from_user(ctl_buf,
Anton Blanchard228e5482011-05-02 20:21:35 +00001918 (void __user __force *)msg_sys->msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001919 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00001921 msg_sys->msg_control = ctl_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922 }
Anton Blanchard228e5482011-05-02 20:21:35 +00001923 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924
1925 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00001926 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001927 /*
1928 * If this is sendmmsg() and current destination address is same as
1929 * previously succeeded address, omit asking LSM's decision.
1930 * used_address->name_len is initialized to UINT_MAX so that the first
1931 * destination address never matches.
1932 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07001933 if (used_address && msg_sys->msg_name &&
1934 used_address->name_len == msg_sys->msg_namelen &&
1935 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001936 used_address->name_len)) {
Al Virod8725c82014-12-11 00:02:50 -05001937 err = sock_sendmsg_nosec(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001938 goto out_freectl;
1939 }
Al Virod8725c82014-12-11 00:02:50 -05001940 err = sock_sendmsg(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001941 /*
1942 * If this is sendmmsg() and sending to current destination address was
1943 * successful, remember it.
1944 */
1945 if (used_address && err >= 0) {
1946 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07001947 if (msg_sys->msg_name)
1948 memcpy(&used_address->name, msg_sys->msg_name,
1949 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00001950 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951
1952out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001953 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1955out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04001956 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00001957 return err;
1958}
1959
1960/*
1961 * BSD sendmsg interface
1962 */
1963
Al Viro666547f2014-04-06 14:03:05 -04001964long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
Anton Blanchard228e5482011-05-02 20:21:35 +00001965{
1966 int fput_needed, err;
1967 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07001968 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00001969
Andy Lutomirski1be374a2013-05-22 14:07:44 -07001970 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00001971 if (!sock)
1972 goto out;
1973
Tom Herbert28a94d82016-03-07 14:11:02 -08001974 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
Anton Blanchard228e5482011-05-02 20:21:35 +00001975
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001976 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001977out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978 return err;
1979}
1980
Al Viro666547f2014-04-06 14:03:05 -04001981SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00001982{
1983 if (flags & MSG_CMSG_COMPAT)
1984 return -EINVAL;
1985 return __sys_sendmsg(fd, msg, flags);
1986}
1987
Anton Blanchard228e5482011-05-02 20:21:35 +00001988/*
1989 * Linux sendmmsg interface
1990 */
1991
1992int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
1993 unsigned int flags)
1994{
1995 int fput_needed, err, datagrams;
1996 struct socket *sock;
1997 struct mmsghdr __user *entry;
1998 struct compat_mmsghdr __user *compat_entry;
1999 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002000 struct used_address used_address;
Tom Herbertf0922762016-03-07 14:11:03 -08002001 unsigned int oflags = flags;
Anton Blanchard228e5482011-05-02 20:21:35 +00002002
Anton Blanchard98382f42011-08-04 14:07:39 +00002003 if (vlen > UIO_MAXIOV)
2004 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002005
2006 datagrams = 0;
2007
2008 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2009 if (!sock)
2010 return err;
2011
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002012 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002013 entry = mmsg;
2014 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002015 err = 0;
Tom Herbertf0922762016-03-07 14:11:03 -08002016 flags |= MSG_BATCH;
Anton Blanchard228e5482011-05-02 20:21:35 +00002017
2018 while (datagrams < vlen) {
Tom Herbertf0922762016-03-07 14:11:03 -08002019 if (datagrams == vlen - 1)
2020 flags = oflags;
2021
Anton Blanchard228e5482011-05-02 20:21:35 +00002022 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002023 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002024 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002025 if (err < 0)
2026 break;
2027 err = __put_user(err, &compat_entry->msg_len);
2028 ++compat_entry;
2029 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002030 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002031 (struct user_msghdr __user *)entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002032 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002033 if (err < 0)
2034 break;
2035 err = put_user(err, &entry->msg_len);
2036 ++entry;
2037 }
2038
2039 if (err)
2040 break;
2041 ++datagrams;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002042 cond_resched();
Anton Blanchard228e5482011-05-02 20:21:35 +00002043 }
2044
Anton Blanchard228e5482011-05-02 20:21:35 +00002045 fput_light(sock->file, fput_needed);
2046
Anton Blanchard728ffb82011-08-04 14:07:38 +00002047 /* We only return an error if no datagrams were able to be sent */
2048 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002049 return datagrams;
2050
Anton Blanchard228e5482011-05-02 20:21:35 +00002051 return err;
2052}
2053
2054SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2055 unsigned int, vlen, unsigned int, flags)
2056{
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002057 if (flags & MSG_CMSG_COMPAT)
2058 return -EINVAL;
Anton Blanchard228e5482011-05-02 20:21:35 +00002059 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2060}
2061
Al Viro666547f2014-04-06 14:03:05 -04002062static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002063 struct msghdr *msg_sys, unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002065 struct compat_msghdr __user *msg_compat =
2066 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002068 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069 unsigned long cmsg_ptr;
Al Viro2da62902015-03-14 21:13:46 -04002070 int len;
Al Viro08adb7d2014-11-10 20:23:13 -05002071 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072
2073 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002074 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075
2076 /* user mode address pointers */
2077 struct sockaddr __user *uaddr;
Al Viro08adb7d2014-11-10 20:23:13 -05002078 int __user *uaddr_len = COMPAT_NAMELEN(msg);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002079
Al Viro08adb7d2014-11-10 20:23:13 -05002080 msg_sys->msg_name = &addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002082 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002083 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002084 else
Al Viro08adb7d2014-11-10 20:23:13 -05002085 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002086 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04002087 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002089 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2090 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002091
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002092 /* We assume all kernel code knows the size of sockaddr_storage */
2093 msg_sys->msg_namelen = 0;
2094
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095 if (sock->file->f_flags & O_NONBLOCK)
2096 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002097 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098 if (err < 0)
2099 goto out_freeiov;
2100 len = err;
2101
2102 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002103 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002104 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002105 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002106 if (err < 0)
2107 goto out_freeiov;
2108 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002109 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002110 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002111 if (err)
2112 goto out_freeiov;
2113 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002114 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115 &msg_compat->msg_controllen);
2116 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002117 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002118 &msg->msg_controllen);
2119 if (err)
2120 goto out_freeiov;
2121 err = len;
2122
2123out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04002124 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002125 return err;
2126}
2127
2128/*
2129 * BSD recvmsg interface
2130 */
2131
Al Viro666547f2014-04-06 14:03:05 -04002132long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002133{
2134 int fput_needed, err;
2135 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002136 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002137
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002138 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002139 if (!sock)
2140 goto out;
2141
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002142 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002143
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002144 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145out:
2146 return err;
2147}
2148
Al Viro666547f2014-04-06 14:03:05 -04002149SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002150 unsigned int, flags)
2151{
2152 if (flags & MSG_CMSG_COMPAT)
2153 return -EINVAL;
2154 return __sys_recvmsg(fd, msg, flags);
2155}
2156
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002157/*
2158 * Linux recvmmsg interface
2159 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002161int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2162 unsigned int flags, struct timespec *timeout)
2163{
2164 int fput_needed, err, datagrams;
2165 struct socket *sock;
2166 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002167 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002168 struct msghdr msg_sys;
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002169 struct timespec64 end_time;
2170 struct timespec64 timeout64;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002171
2172 if (timeout &&
2173 poll_select_set_timeout(&end_time, timeout->tv_sec,
2174 timeout->tv_nsec))
2175 return -EINVAL;
2176
2177 datagrams = 0;
2178
2179 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2180 if (!sock)
2181 return err;
2182
2183 err = sock_error(sock->sk);
2184 if (err)
2185 goto out_put;
2186
2187 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002188 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002189
2190 while (datagrams < vlen) {
2191 /*
2192 * No need to ask LSM for more than the first datagram.
2193 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002194 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002195 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002196 &msg_sys, flags & ~MSG_WAITFORONE,
2197 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002198 if (err < 0)
2199 break;
2200 err = __put_user(err, &compat_entry->msg_len);
2201 ++compat_entry;
2202 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002203 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002204 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002205 &msg_sys, flags & ~MSG_WAITFORONE,
2206 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002207 if (err < 0)
2208 break;
2209 err = put_user(err, &entry->msg_len);
2210 ++entry;
2211 }
2212
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002213 if (err)
2214 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002215 ++datagrams;
2216
Brandon L Black71c5c152010-03-26 16:18:03 +00002217 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2218 if (flags & MSG_WAITFORONE)
2219 flags |= MSG_DONTWAIT;
2220
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002221 if (timeout) {
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002222 ktime_get_ts64(&timeout64);
2223 *timeout = timespec64_to_timespec(
2224 timespec64_sub(end_time, timeout64));
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002225 if (timeout->tv_sec < 0) {
2226 timeout->tv_sec = timeout->tv_nsec = 0;
2227 break;
2228 }
2229
2230 /* Timeout, return less than vlen datagrams */
2231 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2232 break;
2233 }
2234
2235 /* Out of band data, return right away */
2236 if (msg_sys.msg_flags & MSG_OOB)
2237 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002238 cond_resched();
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002239 }
2240
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002241 if (err == 0)
2242 goto out_put;
2243
2244 if (datagrams == 0) {
2245 datagrams = err;
2246 goto out_put;
2247 }
2248
2249 /*
2250 * We may return less entries than requested (vlen) if the
2251 * sock is non block and there aren't enough datagrams...
2252 */
2253 if (err != -EAGAIN) {
2254 /*
2255 * ... or if recvmsg returns an error after we
2256 * received some datagrams, where we record the
2257 * error to return on the next call or if the
2258 * app asks about it using getsockopt(SO_ERROR).
2259 */
2260 sock->sk->sk_err = -err;
2261 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002262out_put:
2263 fput_light(sock->file, fput_needed);
2264
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002265 return datagrams;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002266}
2267
2268SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2269 unsigned int, vlen, unsigned int, flags,
2270 struct timespec __user *, timeout)
2271{
2272 int datagrams;
2273 struct timespec timeout_sys;
2274
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002275 if (flags & MSG_CMSG_COMPAT)
2276 return -EINVAL;
2277
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002278 if (!timeout)
2279 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2280
2281 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2282 return -EFAULT;
2283
2284 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2285
2286 if (datagrams > 0 &&
2287 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2288 datagrams = -EFAULT;
2289
2290 return datagrams;
2291}
2292
2293#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002294/* Argument list sizes for sys_socketcall */
2295#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002296static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002297 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2298 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2299 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002300 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002301};
2302
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303#undef AL
2304
2305/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002306 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307 *
2308 * Argument checking cleaned up. Saved 20% in size.
2309 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002310 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002311 */
2312
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002313SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002314{
Chen Gang2950fa92013-04-07 16:55:23 +08002315 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002316 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002317 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002318 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319
Anton Blanchard228e5482011-05-02 20:21:35 +00002320 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002321 return -EINVAL;
2322
Arjan van de Ven47379052009-09-28 12:57:44 -07002323 len = nargs[call];
2324 if (len > sizeof(a))
2325 return -EINVAL;
2326
Linus Torvalds1da177e2005-04-16 15:20:36 -07002327 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002328 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002330
Chen Gang2950fa92013-04-07 16:55:23 +08002331 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2332 if (err)
2333 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002334
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002335 a0 = a[0];
2336 a1 = a[1];
2337
2338 switch (call) {
2339 case SYS_SOCKET:
2340 err = sys_socket(a0, a1, a[2]);
2341 break;
2342 case SYS_BIND:
2343 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2344 break;
2345 case SYS_CONNECT:
2346 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2347 break;
2348 case SYS_LISTEN:
2349 err = sys_listen(a0, a1);
2350 break;
2351 case SYS_ACCEPT:
Ulrich Drepperde11def2008-11-19 15:36:14 -08002352 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2353 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002354 break;
2355 case SYS_GETSOCKNAME:
2356 err =
2357 sys_getsockname(a0, (struct sockaddr __user *)a1,
2358 (int __user *)a[2]);
2359 break;
2360 case SYS_GETPEERNAME:
2361 err =
2362 sys_getpeername(a0, (struct sockaddr __user *)a1,
2363 (int __user *)a[2]);
2364 break;
2365 case SYS_SOCKETPAIR:
2366 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2367 break;
2368 case SYS_SEND:
2369 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2370 break;
2371 case SYS_SENDTO:
2372 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2373 (struct sockaddr __user *)a[4], a[5]);
2374 break;
2375 case SYS_RECV:
2376 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2377 break;
2378 case SYS_RECVFROM:
2379 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2380 (struct sockaddr __user *)a[4],
2381 (int __user *)a[5]);
2382 break;
2383 case SYS_SHUTDOWN:
2384 err = sys_shutdown(a0, a1);
2385 break;
2386 case SYS_SETSOCKOPT:
2387 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2388 break;
2389 case SYS_GETSOCKOPT:
2390 err =
2391 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2392 (int __user *)a[4]);
2393 break;
2394 case SYS_SENDMSG:
Al Viro666547f2014-04-06 14:03:05 -04002395 err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002396 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002397 case SYS_SENDMMSG:
2398 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2399 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002400 case SYS_RECVMSG:
Al Viro666547f2014-04-06 14:03:05 -04002401 err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002402 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002403 case SYS_RECVMMSG:
2404 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2405 (struct timespec __user *)a[4]);
2406 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002407 case SYS_ACCEPT4:
2408 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2409 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002410 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002411 default:
2412 err = -EINVAL;
2413 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002414 }
2415 return err;
2416}
2417
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002418#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002420/**
2421 * sock_register - add a socket protocol handler
2422 * @ops: description of protocol
2423 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002424 * This function is called by a protocol handler that wants to
2425 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09002426 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002427 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002428 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002429int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002430{
2431 int err;
2432
2433 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08002434 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002435 return -ENOBUFS;
2436 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002437
2438 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002439 if (rcu_dereference_protected(net_families[ops->family],
2440 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002441 err = -EEXIST;
2442 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00002443 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002444 err = 0;
2445 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002446 spin_unlock(&net_family_lock);
2447
Yang Yingliang3410f222014-02-12 17:09:55 +08002448 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449 return err;
2450}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002451EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002452
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002453/**
2454 * sock_unregister - remove a protocol handler
2455 * @family: protocol family to remove
2456 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002457 * This function is called by a protocol handler that wants to
2458 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002459 * new socket creation.
2460 *
2461 * If protocol handler is a module, then it can use module reference
2462 * counts to protect against new references. If protocol handler is not
2463 * a module then it needs to provide its own protection in
2464 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002465 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002466void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002467{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002468 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002469
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002470 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00002471 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002472 spin_unlock(&net_family_lock);
2473
2474 synchronize_rcu();
2475
Yang Yingliang3410f222014-02-12 17:09:55 +08002476 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002477}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002478EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002479
Andi Kleen77d76ea2005-12-22 12:43:42 -08002480static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002481{
Nick Pigginb3e19d92011-01-07 17:50:11 +11002482 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00002483 /*
2484 * Initialize the network sysctl infrastructure.
2485 */
2486 err = net_sysctl_init();
2487 if (err)
2488 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11002489
Linus Torvalds1da177e2005-04-16 15:20:36 -07002490 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002491 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002492 */
2493 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002494
2495 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002496 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002497 */
2498
2499 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11002500
2501 err = register_filesystem(&sock_fs_type);
2502 if (err)
2503 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002504 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11002505 if (IS_ERR(sock_mnt)) {
2506 err = PTR_ERR(sock_mnt);
2507 goto out_mount;
2508 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08002509
2510 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002511 */
2512
2513#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00002514 err = netfilter_init();
2515 if (err)
2516 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002517#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002518
Daniel Borkmann408eccc2014-04-01 16:20:23 +02002519 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00002520
Nick Pigginb3e19d92011-01-07 17:50:11 +11002521out:
2522 return err;
2523
2524out_mount:
2525 unregister_filesystem(&sock_fs_type);
2526out_fs:
2527 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002528}
2529
Andi Kleen77d76ea2005-12-22 12:43:42 -08002530core_initcall(sock_init); /* early initcall */
2531
Linus Torvalds1da177e2005-04-16 15:20:36 -07002532#ifdef CONFIG_PROC_FS
2533void socket_seq_show(struct seq_file *seq)
2534{
2535 int cpu;
2536 int counter = 0;
2537
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07002538 for_each_possible_cpu(cpu)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002539 counter += per_cpu(sockets_in_use, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002540
2541 /* It can be negative, by the way. 8) */
2542 if (counter < 0)
2543 counter = 0;
2544
2545 seq_printf(seq, "sockets: used %d\n", counter);
2546}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002547#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002548
Shaun Pereira89bbfc92006-03-21 23:58:08 -08002549#ifdef CONFIG_COMPAT
Arnd Bergmann6b960182009-11-06 23:10:54 -08002550static int do_siocgstamp(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002551 unsigned int cmd, void __user *up)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002552{
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002553 mm_segment_t old_fs = get_fs();
2554 struct timeval ktv;
2555 int err;
2556
2557 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002558 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002559 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002560 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002561 err = compat_put_timeval(&ktv, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002562
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002563 return err;
2564}
2565
Arnd Bergmann6b960182009-11-06 23:10:54 -08002566static int do_siocgstampns(struct net *net, struct socket *sock,
H. Peter Anvin644595f2012-02-19 17:51:59 -08002567 unsigned int cmd, void __user *up)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002568{
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002569 mm_segment_t old_fs = get_fs();
2570 struct timespec kts;
2571 int err;
2572
2573 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08002574 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002575 set_fs(old_fs);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002576 if (!err)
Mikulas Patockaed6fe9d2012-09-01 12:34:07 -04002577 err = compat_put_timespec(&kts, up);
H. Peter Anvin644595f2012-02-19 17:51:59 -08002578
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002579 return err;
2580}
2581
Arnd Bergmann6b960182009-11-06 23:10:54 -08002582static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002583{
2584 struct ifreq __user *uifr;
2585 int err;
2586
2587 uifr = compat_alloc_user_space(sizeof(struct ifreq));
Arnd Bergmann6b960182009-11-06 23:10:54 -08002588 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002589 return -EFAULT;
2590
Arnd Bergmann6b960182009-11-06 23:10:54 -08002591 err = dev_ioctl(net, SIOCGIFNAME, uifr);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002592 if (err)
2593 return err;
2594
Arnd Bergmann6b960182009-11-06 23:10:54 -08002595 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002596 return -EFAULT;
2597
2598 return 0;
2599}
2600
Arnd Bergmann6b960182009-11-06 23:10:54 -08002601static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002602{
Arnd Bergmann6b960182009-11-06 23:10:54 -08002603 struct compat_ifconf ifc32;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002604 struct ifconf ifc;
2605 struct ifconf __user *uifc;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002606 struct compat_ifreq __user *ifr32;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002607 struct ifreq __user *ifr;
2608 unsigned int i, j;
2609 int err;
2610
Arnd Bergmann6b960182009-11-06 23:10:54 -08002611 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002612 return -EFAULT;
2613
Mathias Krause43da5f22012-08-15 11:31:57 +00002614 memset(&ifc, 0, sizeof(ifc));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002615 if (ifc32.ifcbuf == 0) {
2616 ifc32.ifc_len = 0;
2617 ifc.ifc_len = 0;
2618 ifc.ifc_req = NULL;
2619 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2620 } else {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002621 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2622 sizeof(struct ifreq);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002623 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2624 ifc.ifc_len = len;
2625 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2626 ifr32 = compat_ptr(ifc32.ifcbuf);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002627 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
Arnd Bergmann6b960182009-11-06 23:10:54 -08002628 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002629 return -EFAULT;
2630 ifr++;
2631 ifr32++;
2632 }
2633 }
2634 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2635 return -EFAULT;
2636
Arnd Bergmann6b960182009-11-06 23:10:54 -08002637 err = dev_ioctl(net, SIOCGIFCONF, uifc);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002638 if (err)
2639 return err;
2640
2641 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2642 return -EFAULT;
2643
2644 ifr = ifc.ifc_req;
2645 ifr32 = compat_ptr(ifc32.ifcbuf);
2646 for (i = 0, j = 0;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002647 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2648 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2649 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002650 return -EFAULT;
2651 ifr32++;
2652 ifr++;
2653 }
2654
2655 if (ifc32.ifcbuf == 0) {
2656 /* Translate from 64-bit structure multiple to
2657 * a 32-bit one.
2658 */
2659 i = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08002660 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002661 ifc32.ifc_len = i;
2662 } else {
2663 ifc32.ifc_len = i;
2664 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08002665 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002666 return -EFAULT;
2667
2668 return 0;
2669}
2670
Arnd Bergmann6b960182009-11-06 23:10:54 -08002671static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002672{
Ben Hutchings3a7da392011-03-17 07:34:32 +00002673 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2674 bool convert_in = false, convert_out = false;
2675 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2676 struct ethtool_rxnfc __user *rxnfc;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002677 struct ifreq __user *ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002678 u32 rule_cnt = 0, actual_rule_cnt;
2679 u32 ethcmd;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002680 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00002681 int ret;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002682
2683 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2684 return -EFAULT;
2685
Ben Hutchings3a7da392011-03-17 07:34:32 +00002686 compat_rxnfc = compat_ptr(data);
2687
2688 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002689 return -EFAULT;
2690
Ben Hutchings3a7da392011-03-17 07:34:32 +00002691 /* Most ethtool structures are defined without padding.
2692 * Unfortunately struct ethtool_rxnfc is an exception.
2693 */
2694 switch (ethcmd) {
2695 default:
2696 break;
2697 case ETHTOOL_GRXCLSRLALL:
2698 /* Buffer size is variable */
2699 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2700 return -EFAULT;
2701 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2702 return -ENOMEM;
2703 buf_size += rule_cnt * sizeof(u32);
2704 /* fall through */
2705 case ETHTOOL_GRXRINGS:
2706 case ETHTOOL_GRXCLSRLCNT:
2707 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00002708 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002709 convert_out = true;
2710 /* fall through */
2711 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00002712 buf_size += sizeof(struct ethtool_rxnfc);
2713 convert_in = true;
2714 break;
2715 }
2716
2717 ifr = compat_alloc_user_space(buf_size);
Stephen Hemminger954b1242013-02-11 06:22:28 +00002718 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
Ben Hutchings3a7da392011-03-17 07:34:32 +00002719
2720 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2721 return -EFAULT;
2722
2723 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2724 &ifr->ifr_ifru.ifru_data))
2725 return -EFAULT;
2726
2727 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00002728 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00002729 * fs.ring_cookie and at the end of fs, but nowhere else.
2730 */
Alexander Duyck127fe532011-04-08 18:01:59 +00002731 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2732 sizeof(compat_rxnfc->fs.m_ext) !=
2733 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2734 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00002735 BUILD_BUG_ON(
2736 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2737 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2738 offsetof(struct ethtool_rxnfc, fs.location) -
2739 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2740
2741 if (copy_in_user(rxnfc, compat_rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002742 (void __user *)(&rxnfc->fs.m_ext + 1) -
2743 (void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002744 copy_in_user(&rxnfc->fs.ring_cookie,
2745 &compat_rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002746 (void __user *)(&rxnfc->fs.location + 1) -
2747 (void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002748 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2749 sizeof(rxnfc->rule_cnt)))
2750 return -EFAULT;
2751 }
2752
2753 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2754 if (ret)
2755 return ret;
2756
2757 if (convert_out) {
2758 if (copy_in_user(compat_rxnfc, rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002759 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2760 (const void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002761 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2762 &rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00002763 (const void __user *)(&rxnfc->fs.location + 1) -
2764 (const void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00002765 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2766 sizeof(rxnfc->rule_cnt)))
2767 return -EFAULT;
2768
2769 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2770 /* As an optimisation, we only copy the actual
2771 * number of rules that the underlying
2772 * function returned. Since Mallory might
2773 * change the rule count in user memory, we
2774 * check that it is less than the rule count
2775 * originally given (as the user buffer size),
2776 * which has been range-checked.
2777 */
2778 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2779 return -EFAULT;
2780 if (actual_rule_cnt < rule_cnt)
2781 rule_cnt = actual_rule_cnt;
2782 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2783 &rxnfc->rule_locs[0],
2784 rule_cnt * sizeof(u32)))
2785 return -EFAULT;
2786 }
2787 }
2788
2789 return 0;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002790}
2791
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002792static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2793{
2794 void __user *uptr;
2795 compat_uptr_t uptr32;
2796 struct ifreq __user *uifr;
2797
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002798 uifr = compat_alloc_user_space(sizeof(*uifr));
Arnd Bergmann7a50a242009-11-08 20:57:03 -08002799 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2800 return -EFAULT;
2801
2802 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2803 return -EFAULT;
2804
2805 uptr = compat_ptr(uptr32);
2806
2807 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2808 return -EFAULT;
2809
2810 return dev_ioctl(net, SIOCWANDEV, uifr);
2811}
2812
Arnd Bergmann6b960182009-11-06 23:10:54 -08002813static int bond_ioctl(struct net *net, unsigned int cmd,
2814 struct compat_ifreq __user *ifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002815{
2816 struct ifreq kifr;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002817 mm_segment_t old_fs;
2818 int err;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002819
2820 switch (cmd) {
2821 case SIOCBONDENSLAVE:
2822 case SIOCBONDRELEASE:
2823 case SIOCBONDSETHWADDR:
2824 case SIOCBONDCHANGEACTIVE:
Arnd Bergmann6b960182009-11-06 23:10:54 -08002825 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002826 return -EFAULT;
2827
2828 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002829 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002830 err = dev_ioctl(net, cmd,
2831 (struct ifreq __user __force *) &kifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002832 set_fs(old_fs);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002833
2834 return err;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002835 default:
Linus Torvalds07d106d2012-01-05 15:40:12 -08002836 return -ENOIOCTLCMD;
Joe Perchesccbd6a52010-05-14 10:58:26 +00002837 }
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002838}
2839
Ben Hutchings590d4692013-11-18 17:04:13 +00002840/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
2841static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08002842 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002843{
2844 struct ifreq __user *u_ifreq64;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002845 char tmp_buf[IFNAMSIZ];
2846 void __user *data64;
2847 u32 data32;
2848
2849 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
2850 IFNAMSIZ))
2851 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00002852 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002853 return -EFAULT;
2854 data64 = compat_ptr(data32);
2855
2856 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
2857
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002858 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
2859 IFNAMSIZ))
2860 return -EFAULT;
Ben Hutchings417c3522013-11-18 17:04:58 +00002861 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002862 return -EFAULT;
2863
Arnd Bergmann6b960182009-11-06 23:10:54 -08002864 return dev_ioctl(net, cmd, u_ifreq64);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002865}
2866
Arnd Bergmann6b960182009-11-06 23:10:54 -08002867static int dev_ifsioc(struct net *net, struct socket *sock,
2868 unsigned int cmd, struct compat_ifreq __user *uifr32)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002869{
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002870 struct ifreq __user *uifr;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002871 int err;
2872
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002873 uifr = compat_alloc_user_space(sizeof(*uifr));
2874 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
2875 return -EFAULT;
2876
2877 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
2878
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002879 if (!err) {
2880 switch (cmd) {
2881 case SIOCGIFFLAGS:
2882 case SIOCGIFMETRIC:
2883 case SIOCGIFMTU:
2884 case SIOCGIFMEM:
2885 case SIOCGIFHWADDR:
2886 case SIOCGIFINDEX:
2887 case SIOCGIFADDR:
2888 case SIOCGIFBRDADDR:
2889 case SIOCGIFDSTADDR:
2890 case SIOCGIFNETMASK:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002891 case SIOCGIFPFLAGS:
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002892 case SIOCGIFTXQLEN:
Arnd Bergmannfab25322009-11-08 20:56:21 -08002893 case SIOCGMIIPHY:
2894 case SIOCGMIIREG:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002895 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002896 err = -EFAULT;
2897 break;
2898 }
2899 }
2900 return err;
2901}
2902
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002903static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2904 struct compat_ifreq __user *uifr32)
2905{
2906 struct ifreq ifr;
2907 struct compat_ifmap __user *uifmap32;
2908 mm_segment_t old_fs;
2909 int err;
2910
2911 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2912 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002913 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2914 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2915 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2916 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
2917 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
2918 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002919 if (err)
2920 return -EFAULT;
2921
2922 old_fs = get_fs();
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002923 set_fs(KERNEL_DS);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00002924 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002925 set_fs(old_fs);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002926
2927 if (cmd == SIOCGIFMAP && !err) {
2928 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002929 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2930 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2931 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2932 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
2933 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
2934 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00002935 if (err)
2936 err = -EFAULT;
2937 }
2938 return err;
2939}
2940
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002941struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002942 u32 rt_pad1;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002943 struct sockaddr rt_dst; /* target address */
2944 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
2945 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002946 unsigned short rt_flags;
2947 short rt_pad2;
2948 u32 rt_pad3;
2949 unsigned char rt_tos;
2950 unsigned char rt_class;
2951 short rt_pad4;
2952 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002953 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002954 u32 rt_mtu; /* per route MTU/Window */
2955 u32 rt_window; /* Window clamping */
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002956 unsigned short rt_irtt; /* Initial RTT */
2957};
2958
2959struct in6_rtmsg32 {
2960 struct in6_addr rtmsg_dst;
2961 struct in6_addr rtmsg_src;
2962 struct in6_addr rtmsg_gateway;
2963 u32 rtmsg_type;
2964 u16 rtmsg_dst_len;
2965 u16 rtmsg_src_len;
2966 u32 rtmsg_metric;
2967 u32 rtmsg_info;
2968 u32 rtmsg_flags;
2969 s32 rtmsg_ifindex;
2970};
2971
Arnd Bergmann6b960182009-11-06 23:10:54 -08002972static int routing_ioctl(struct net *net, struct socket *sock,
2973 unsigned int cmd, void __user *argp)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002974{
2975 int ret;
2976 void *r = NULL;
2977 struct in6_rtmsg r6;
2978 struct rtentry r4;
2979 char devname[16];
2980 u32 rtdev;
2981 mm_segment_t old_fs = get_fs();
2982
Arnd Bergmann6b960182009-11-06 23:10:54 -08002983 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
2984 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002985 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002986 3 * sizeof(struct in6_addr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07002987 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
2988 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
2989 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
2990 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
2991 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
2992 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
2993 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002994
2995 r = (void *) &r6;
2996 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08002997 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002998 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a2293872009-11-06 23:00:29 -08002999 3 * sizeof(struct sockaddr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003000 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3001 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3002 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3003 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3004 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3005 ret |= get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003006 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003007 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003008 r4.rt_dev = (char __user __force *)devname;
3009 devname[15] = 0;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003010 } else
3011 r4.rt_dev = NULL;
3012
3013 r = (void *) &r4;
3014 }
3015
3016 if (ret) {
3017 ret = -EFAULT;
3018 goto out;
3019 }
3020
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003021 set_fs(KERNEL_DS);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003022 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003023 set_fs(old_fs);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003024
3025out:
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003026 return ret;
3027}
3028
3029/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3030 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003031 * use compatible ioctls
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003032 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003033static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003034{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003035 compat_ulong_t tmp;
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003036
Arnd Bergmann6b960182009-11-06 23:10:54 -08003037 if (get_user(tmp, argp))
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003038 return -EFAULT;
3039 if (tmp == BRCTL_GET_VERSION)
3040 return BRCTL_VERSION + 1;
3041 return -EINVAL;
3042}
3043
Arnd Bergmann6b960182009-11-06 23:10:54 -08003044static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3045 unsigned int cmd, unsigned long arg)
3046{
3047 void __user *argp = compat_ptr(arg);
3048 struct sock *sk = sock->sk;
3049 struct net *net = sock_net(sk);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003050
Arnd Bergmann6b960182009-11-06 23:10:54 -08003051 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003052 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003053
Arnd Bergmann6b960182009-11-06 23:10:54 -08003054 switch (cmd) {
3055 case SIOCSIFBR:
3056 case SIOCGIFBR:
3057 return old_bridge_ioctl(argp);
3058 case SIOCGIFNAME:
3059 return dev_ifname32(net, argp);
3060 case SIOCGIFCONF:
3061 return dev_ifconf(net, argp);
3062 case SIOCETHTOOL:
3063 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003064 case SIOCWANDEV:
3065 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003066 case SIOCGIFMAP:
3067 case SIOCSIFMAP:
3068 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003069 case SIOCBONDENSLAVE:
3070 case SIOCBONDRELEASE:
3071 case SIOCBONDSETHWADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003072 case SIOCBONDCHANGEACTIVE:
3073 return bond_ioctl(net, cmd, argp);
3074 case SIOCADDRT:
3075 case SIOCDELRT:
3076 return routing_ioctl(net, sock, cmd, argp);
3077 case SIOCGSTAMP:
3078 return do_siocgstamp(net, sock, cmd, argp);
3079 case SIOCGSTAMPNS:
3080 return do_siocgstampns(net, sock, cmd, argp);
Ben Hutchings590d4692013-11-18 17:04:13 +00003081 case SIOCBONDSLAVEINFOQUERY:
3082 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003083 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003084 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003085 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003086
Arnd Bergmann6b960182009-11-06 23:10:54 -08003087 case FIOSETOWN:
3088 case SIOCSPGRP:
3089 case FIOGETOWN:
3090 case SIOCGPGRP:
3091 case SIOCBRADDBR:
3092 case SIOCBRDELBR:
3093 case SIOCGIFVLAN:
3094 case SIOCSIFVLAN:
3095 case SIOCADDDLCI:
3096 case SIOCDELDLCI:
3097 return sock_ioctl(file, cmd, arg);
3098
3099 case SIOCGIFFLAGS:
3100 case SIOCSIFFLAGS:
3101 case SIOCGIFMETRIC:
3102 case SIOCSIFMETRIC:
3103 case SIOCGIFMTU:
3104 case SIOCSIFMTU:
3105 case SIOCGIFMEM:
3106 case SIOCSIFMEM:
3107 case SIOCGIFHWADDR:
3108 case SIOCSIFHWADDR:
3109 case SIOCADDMULTI:
3110 case SIOCDELMULTI:
3111 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003112 case SIOCGIFADDR:
3113 case SIOCSIFADDR:
3114 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003115 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003116 case SIOCGIFBRDADDR:
3117 case SIOCSIFBRDADDR:
3118 case SIOCGIFDSTADDR:
3119 case SIOCSIFDSTADDR:
3120 case SIOCGIFNETMASK:
3121 case SIOCSIFNETMASK:
3122 case SIOCSIFPFLAGS:
3123 case SIOCGIFPFLAGS:
3124 case SIOCGIFTXQLEN:
3125 case SIOCSIFTXQLEN:
3126 case SIOCBRADDIF:
3127 case SIOCBRDELIF:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003128 case SIOCSIFNAME:
3129 case SIOCGMIIPHY:
3130 case SIOCGMIIREG:
3131 case SIOCSMIIREG:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003132 return dev_ifsioc(net, sock, cmd, argp);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003133
Arnd Bergmann6b960182009-11-06 23:10:54 -08003134 case SIOCSARP:
3135 case SIOCGARP:
3136 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003137 case SIOCATMARK:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003138 return sock_do_ioctl(net, sock, cmd, arg);
3139 }
3140
Arnd Bergmann6b960182009-11-06 23:10:54 -08003141 return -ENOIOCTLCMD;
3142}
Arnd Bergmann7a2293872009-11-06 23:00:29 -08003143
Eric Dumazet95c96172012-04-15 05:58:06 +00003144static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003145 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003146{
3147 struct socket *sock = file->private_data;
3148 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003149 struct sock *sk;
3150 struct net *net;
3151
3152 sk = sock->sk;
3153 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003154
3155 if (sock->ops->compat_ioctl)
3156 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3157
David S. Miller87de87d2008-06-03 09:14:03 -07003158 if (ret == -ENOIOCTLCMD &&
3159 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3160 ret = compat_wext_handle_ioctl(net, cmd, arg);
3161
Arnd Bergmann6b960182009-11-06 23:10:54 -08003162 if (ret == -ENOIOCTLCMD)
3163 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3164
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003165 return ret;
3166}
3167#endif
3168
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003169int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3170{
3171 return sock->ops->bind(sock, addr, addrlen);
3172}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003173EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003174
3175int kernel_listen(struct socket *sock, int backlog)
3176{
3177 return sock->ops->listen(sock, backlog);
3178}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003179EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003180
3181int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3182{
3183 struct sock *sk = sock->sk;
3184 int err;
3185
3186 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3187 newsock);
3188 if (err < 0)
3189 goto done;
3190
3191 err = sock->ops->accept(sock, *newsock, flags);
3192 if (err < 0) {
3193 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003194 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003195 goto done;
3196 }
3197
3198 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003199 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003200
3201done:
3202 return err;
3203}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003204EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003205
3206int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003207 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003208{
3209 return sock->ops->connect(sock, addr, addrlen, flags);
3210}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003211EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003212
3213int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3214 int *addrlen)
3215{
3216 return sock->ops->getname(sock, addr, addrlen, 0);
3217}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003218EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003219
3220int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3221 int *addrlen)
3222{
3223 return sock->ops->getname(sock, addr, addrlen, 1);
3224}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003225EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003226
3227int kernel_getsockopt(struct socket *sock, int level, int optname,
3228 char *optval, int *optlen)
3229{
3230 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003231 char __user *uoptval;
3232 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003233 int err;
3234
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003235 uoptval = (char __user __force *) optval;
3236 uoptlen = (int __user __force *) optlen;
3237
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003238 set_fs(KERNEL_DS);
3239 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003240 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003241 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003242 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3243 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003244 set_fs(oldfs);
3245 return err;
3246}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003247EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003248
3249int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003250 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003251{
3252 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003253 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003254 int err;
3255
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003256 uoptval = (char __user __force *) optval;
3257
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003258 set_fs(KERNEL_DS);
3259 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003260 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003261 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003262 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003263 optlen);
3264 set_fs(oldfs);
3265 return err;
3266}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003267EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003268
3269int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3270 size_t size, int flags)
3271{
3272 if (sock->ops->sendpage)
3273 return sock->ops->sendpage(sock, page, offset, size, flags);
3274
3275 return sock_no_sendpage(sock, page, offset, size, flags);
3276}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003277EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003278
3279int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3280{
3281 mm_segment_t oldfs = get_fs();
3282 int err;
3283
3284 set_fs(KERNEL_DS);
3285 err = sock->ops->ioctl(sock, cmd, arg);
3286 set_fs(oldfs);
3287
3288 return err;
3289}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003290EXPORT_SYMBOL(kernel_sock_ioctl);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003291
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003292int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3293{
3294 return sock->ops->shutdown(sock, how);
3295}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003296EXPORT_SYMBOL(kernel_sock_shutdown);