blob: 40ab39f6c5d8bfa9fc0aa2fd793b85371e719d52 [file] [log] [blame]
Thomas Gleixner2874c5f2019-05-27 08:55:01 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * NET An implementation of the SOCKET network access protocol.
4 *
5 * Version: @(#)socket.c 1.1.93 18/02/95
6 *
7 * Authors: Orest Zborowski, <obz@Kodak.COM>
Jesper Juhl02c30a82005-05-05 16:16:16 -07008 * Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 *
11 * Fixes:
12 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
13 * shutdown()
14 * Alan Cox : verify_area() fixes
15 * Alan Cox : Removed DDI
16 * Jonathan Kamens : SOCK_DGRAM reconnect bug
17 * Alan Cox : Moved a load of checks to the very
18 * top level.
19 * Alan Cox : Move address structures to/from user
20 * mode above the protocol layers.
21 * Rob Janssen : Allow 0 length sends.
22 * Alan Cox : Asynchronous I/O support (cribbed from the
23 * tty drivers).
24 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
25 * Jeff Uphoff : Made max number of sockets command-line
26 * configurable.
27 * Matti Aarnio : Made the number of sockets dynamic,
28 * to be allocated when needed, and mr.
29 * Uphoff's max is used as max to be
30 * allowed to allocate.
31 * Linus : Argh. removed all the socket allocation
32 * altogether: it's in the inode now.
33 * Alan Cox : Made sock_alloc()/sock_release() public
34 * for NetROM and future kernel nfsd type
35 * stuff.
36 * Alan Cox : sendmsg/recvmsg basics.
37 * Tom Dyas : Export net symbols.
38 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
39 * Alan Cox : Added thread locking to sys_* calls
40 * for sockets. May have errors at the
41 * moment.
42 * Kevin Buhr : Fixed the dumb errors in the above.
43 * Andi Kleen : Some small cleanups, optimizations,
44 * and fixed a copy_from_user() bug.
45 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
Stephen Hemminger89bddce2006-09-01 00:19:31 -070046 * Tigran Aivazian : Made listen(2) backlog sanity checks
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 * protocol-independent
48 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 * This module is effectively the top level interface to the BSD socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -070050 * paradigm.
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 *
52 * Based upon Swansea University Computer Society NET3.039
53 */
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <linux/socket.h>
57#include <linux/file.h>
58#include <linux/net.h>
59#include <linux/interrupt.h>
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -070060#include <linux/thread_info.h>
Stephen Hemminger55737fd2006-09-01 00:23:39 -070061#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/netdevice.h>
63#include <linux/proc_fs.h>
64#include <linux/seq_file.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080065#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#include <linux/if_bridge.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030067#include <linux/if_frad.h>
68#include <linux/if_vlan.h>
Daniel Borkmann408eccc2014-04-01 16:20:23 +020069#include <linux/ptp_classify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <linux/init.h>
71#include <linux/poll.h>
72#include <linux/cache.h>
73#include <linux/module.h>
74#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#include <linux/mount.h>
David Howellsfba9be42019-03-25 16:38:24 +000076#include <linux/pseudo_fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070077#include <linux/security.h>
78#include <linux/syscalls.h>
79#include <linux/compat.h>
80#include <linux/kmod.h>
David Woodhouse3ec3b2f2005-05-17 12:08:48 +010081#include <linux/audit.h>
Adrian Bunkd86b5e02006-01-21 00:46:55 +010082#include <linux/wireless.h>
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -070083#include <linux/nsproxy.h>
Nick Black1fd7317d2009-09-22 16:43:33 -070084#include <linux/magic.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090085#include <linux/slab.h>
Masatake YAMATO600e1772012-08-29 10:44:29 +000086#include <linux/xattr.h>
Jeremy Clinec8e8cd52018-07-27 22:43:01 +000087#include <linux/nospec.h>
Paolo Abeni8c3c4472019-05-03 17:01:39 +020088#include <linux/indirect_call_wrapper.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080090#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070091#include <asm/unistd.h>
92
93#include <net/compat.h>
David S. Miller87de87d2008-06-03 09:14:03 -070094#include <net/wext.h>
Herbert Xuf8451722010-05-24 00:12:34 -070095#include <net/cls_cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97#include <net/sock.h>
98#include <linux/netfilter.h>
99
Arnd Bergmann6b960182009-11-06 23:10:54 -0800100#include <linux/if_tun.h>
101#include <linux/ipv6_route.h>
102#include <linux/route.h>
Arnd Bergmann6b960182009-11-06 23:10:54 -0800103#include <linux/sockios.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +0300104#include <net/busy_poll.h>
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400105#include <linux/errqueue.h>
Eliezer Tamir06021292013-06-10 11:39:50 +0300106
Cong Wange0d10952013-08-01 11:10:25 +0800107#ifdef CONFIG_NET_RX_BUSY_POLL
Eliezer Tamir64b0dc52013-07-10 17:13:36 +0300108unsigned int sysctl_net_busy_read __read_mostly;
109unsigned int sysctl_net_busy_poll __read_mostly;
Eliezer Tamir06021292013-06-10 11:39:50 +0300110#endif
Arnd Bergmann6b960182009-11-06 23:10:54 -0800111
Al Viro8ae5e0302014-11-28 19:40:50 -0500112static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to);
113static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700114static int sock_mmap(struct file *file, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
116static int sock_close(struct inode *inode, struct file *file);
Linus Torvaldsa11e1d42018-06-28 09:43:44 -0700117static __poll_t sock_poll(struct file *file,
118 struct poll_table_struct *wait);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700119static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800120#ifdef CONFIG_COMPAT
121static long compat_sock_ioctl(struct file *file,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700122 unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800123#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124static int sock_fasync(int fd, struct file *filp, int on);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125static ssize_t sock_sendpage(struct file *file, struct page *page,
126 int offset, size_t size, loff_t *ppos, int more);
Jens Axboe9c55e012007-11-06 23:30:13 -0800127static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700128 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800129 unsigned int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131/*
132 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
133 * in the operation structures but are done directly via the socketcall() multiplexor.
134 */
135
Arjan van de Venda7071d2007-02-12 00:55:36 -0800136static const struct file_operations socket_file_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 .owner = THIS_MODULE,
138 .llseek = no_llseek,
Al Viro8ae5e0302014-11-28 19:40:50 -0500139 .read_iter = sock_read_iter,
140 .write_iter = sock_write_iter,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 .poll = sock_poll,
142 .unlocked_ioctl = sock_ioctl,
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800143#ifdef CONFIG_COMPAT
144 .compat_ioctl = compat_sock_ioctl,
145#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 .mmap = sock_mmap,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 .release = sock_close,
148 .fasync = sock_fasync,
Jens Axboe5274f052006-03-30 15:15:30 +0200149 .sendpage = sock_sendpage,
150 .splice_write = generic_splice_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800151 .splice_read = sock_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152};
153
154/*
155 * The protocol list. Each protocol is registered in here.
156 */
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158static DEFINE_SPINLOCK(net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +0000159static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700162 * Support routines.
163 * Move socket addresses back and forth across the kernel/user
164 * divide and look after the messy bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 */
166
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167/**
168 * move_addr_to_kernel - copy a socket address into kernel space
169 * @uaddr: Address in user space
170 * @kaddr: Address in kernel space
171 * @ulen: Length in user space
172 *
173 * The address is copied into kernel space. If the provided address is
174 * too long an error code of -EINVAL is returned. If the copy gives
175 * invalid addresses -EFAULT is returned. On a success 0 is returned.
176 */
177
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000178int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179{
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700180 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700182 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700184 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100186 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187}
188
189/**
190 * move_addr_to_user - copy an address to user space
191 * @kaddr: kernel space address
192 * @klen: length of address in kernel
193 * @uaddr: user space address
194 * @ulen: pointer to user length field
195 *
196 * The value pointed to by ulen on entry is the buffer length available.
197 * This is overwritten with the buffer space used. -EINVAL is returned
198 * if an overlong buffer is specified or a negative buffer size. -EFAULT
199 * is returned if either the buffer or the length field are not
200 * accessible.
201 * After copying the data up to the limit the user specifies, the true
202 * length of the data is written over the length limit the user
203 * specified. Zero is returned for a success.
204 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700205
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000206static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
stephen hemminger11165f12010-10-18 14:27:29 +0000207 void __user *uaddr, int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
209 int err;
210 int len;
211
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100212 BUG_ON(klen > sizeof(struct sockaddr_storage));
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700213 err = get_user(len, ulen);
214 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700216 if (len > klen)
217 len = klen;
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100218 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700220 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500221 if (audit_sockaddr(klen, kaddr))
222 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700223 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 return -EFAULT;
225 }
226 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700227 * "fromlen shall refer to the value before truncation.."
228 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 */
230 return __put_user(klen, ulen);
231}
232
Alexey Dobriyan08009a72018-02-24 21:20:33 +0300233static struct kmem_cache *sock_inode_cachep __ro_after_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235static struct inode *sock_alloc_inode(struct super_block *sb)
236{
237 struct socket_alloc *ei;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700238
Christoph Lametere94b1762006-12-06 20:33:17 -0800239 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 if (!ei)
241 return NULL;
Al Viro333f7902019-07-05 20:14:16 +0100242 init_waitqueue_head(&ei->socket.wq.wait);
243 ei->socket.wq.fasync_list = NULL;
244 ei->socket.wq.flags = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700245
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 ei->socket.state = SS_UNCONNECTED;
247 ei->socket.flags = 0;
248 ei->socket.ops = NULL;
249 ei->socket.sk = NULL;
250 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252 return &ei->vfs_inode;
253}
254
Al Viro6d7855c2019-07-05 20:13:22 +0100255static void sock_free_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256{
Eric Dumazet43815482010-04-29 11:01:49 +0000257 struct socket_alloc *ei;
258
259 ei = container_of(inode, struct socket_alloc, vfs_inode);
Eric Dumazet43815482010-04-29 11:01:49 +0000260 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261}
262
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700263static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700265 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Christoph Lametera35afb82007-05-16 22:10:57 -0700267 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700269
yuan linyu1e911632017-01-07 17:18:31 +0800270static void init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271{
272 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700273 sizeof(struct socket_alloc),
274 0,
275 (SLAB_HWCACHE_ALIGN |
276 SLAB_RECLAIM_ACCOUNT |
Vladimir Davydov5d097052016-01-14 15:18:21 -0800277 SLAB_MEM_SPREAD | SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +0900278 init_once);
yuan linyu1e911632017-01-07 17:18:31 +0800279 BUG_ON(sock_inode_cachep == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280}
281
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700282static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700283 .alloc_inode = sock_alloc_inode,
Al Viro6d7855c2019-07-05 20:13:22 +0100284 .free_inode = sock_free_inode,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700285 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286};
287
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700288/*
289 * sockfs_dname() is called from d_path().
290 */
291static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
292{
293 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
David Howellsc5ef6032015-03-17 22:26:16 +0000294 d_inode(dentry)->i_ino);
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700295}
296
Al Viro3ba13d12009-02-20 06:02:22 +0000297static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700298 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299};
300
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200301static int sockfs_xattr_get(const struct xattr_handler *handler,
302 struct dentry *dentry, struct inode *inode,
303 const char *suffix, void *value, size_t size)
304{
305 if (value) {
306 if (dentry->d_name.len + 1 > size)
307 return -ERANGE;
308 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
309 }
310 return dentry->d_name.len + 1;
311}
312
313#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
314#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
315#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
316
317static const struct xattr_handler sockfs_xattr_handler = {
318 .name = XATTR_NAME_SOCKPROTONAME,
319 .get = sockfs_xattr_get,
320};
321
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100322static int sockfs_security_xattr_set(const struct xattr_handler *handler,
323 struct dentry *dentry, struct inode *inode,
324 const char *suffix, const void *value,
325 size_t size, int flags)
326{
327 /* Handled by LSM. */
328 return -EAGAIN;
329}
330
331static const struct xattr_handler sockfs_security_xattr_handler = {
332 .prefix = XATTR_SECURITY_PREFIX,
333 .set = sockfs_security_xattr_set,
334};
335
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200336static const struct xattr_handler *sockfs_xattr_handlers[] = {
337 &sockfs_xattr_handler,
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100338 &sockfs_security_xattr_handler,
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200339 NULL
340};
341
David Howellsfba9be42019-03-25 16:38:24 +0000342static int sockfs_init_fs_context(struct fs_context *fc)
Al Viroc74a1cb2011-01-12 16:59:34 -0500343{
David Howellsfba9be42019-03-25 16:38:24 +0000344 struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC);
345 if (!ctx)
346 return -ENOMEM;
347 ctx->ops = &sockfs_ops;
348 ctx->dops = &sockfs_dentry_operations;
349 ctx->xattr = sockfs_xattr_handlers;
350 return 0;
Al Viroc74a1cb2011-01-12 16:59:34 -0500351}
352
353static struct vfsmount *sock_mnt __read_mostly;
354
355static struct file_system_type sock_fs_type = {
356 .name = "sockfs",
David Howellsfba9be42019-03-25 16:38:24 +0000357 .init_fs_context = sockfs_init_fs_context,
Al Viroc74a1cb2011-01-12 16:59:34 -0500358 .kill_sb = kill_anon_super,
359};
360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361/*
362 * Obtains the first available file descriptor and sets it up for use.
363 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800364 * These functions create file structures and maps them to fd space
365 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 * and file struct implicitly stored in sock->file.
367 * Note that another thread may close file descriptor before we return
368 * from this function. We use the fact that now we do not refer
369 * to socket after mapping. If one day we will need it, this
370 * function will increment ref. count on file by 1.
371 *
372 * In any case returned fd MAY BE not valid!
373 * This race condition is unavoidable
374 * with shared fd spaces, we cannot solve it inside kernel,
375 * but we take care of internal coherence yet.
376 */
377
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300378/**
379 * sock_alloc_file - Bind a &socket to a &file
380 * @sock: socket
381 * @flags: file status flags
382 * @dname: protocol name
383 *
384 * Returns the &file bound with @sock, implicitly storing it
385 * in sock->file. If dname is %NULL, sets to "".
386 * On failure the return is a ERR pointer (see linux/err.h).
387 * This function uses GFP_KERNEL internally.
388 */
389
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700390struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391{
Al Viro7cbe66b2009-08-05 19:59:08 +0400392 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800393
Al Virod93aa9d2018-06-09 09:40:05 -0400394 if (!dname)
395 dname = sock->sk ? sock->sk->sk_prot_creator->name : "";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
Al Virod93aa9d2018-06-09 09:40:05 -0400397 file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname,
398 O_RDWR | (flags & O_NONBLOCK),
399 &socket_file_ops);
Viresh Kumarb5ffe632015-08-12 15:59:47 +0530400 if (IS_ERR(file)) {
Al Viro8e1611e2017-12-05 23:29:09 +0000401 sock_release(sock);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700402 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400403 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800404
405 sock->file = file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800406 file->private_data = sock;
Al Viro28407632012-08-17 23:54:15 -0400407 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800408}
Al Viro56b31d12012-08-18 00:25:51 -0400409EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800410
Al Viro56b31d12012-08-18 00:25:51 -0400411static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800412{
413 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400414 int fd = get_unused_fd_flags(flags);
Al Viroce4bb042018-01-10 18:47:05 -0500415 if (unlikely(fd < 0)) {
416 sock_release(sock);
Al Viro28407632012-08-17 23:54:15 -0400417 return fd;
Al Viroce4bb042018-01-10 18:47:05 -0500418 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800419
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700420 newfile = sock_alloc_file(sock, flags, NULL);
Enrico Weigelt4546e442019-06-05 22:58:50 +0200421 if (!IS_ERR(newfile)) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800422 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400423 return fd;
424 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400425
Al Viro28407632012-08-17 23:54:15 -0400426 put_unused_fd(fd);
427 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428}
429
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300430/**
431 * sock_from_file - Return the &socket bounded to @file.
432 * @file: file
433 * @err: pointer to an error code return
434 *
435 * On failure returns %NULL and assigns -ENOTSOCK to @err.
436 */
437
John Fastabend406a3c62012-07-20 10:39:25 +0000438struct socket *sock_from_file(struct file *file, int *err)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800439{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800440 if (file->f_op == &socket_file_ops)
441 return file->private_data; /* set in sock_map_fd */
442
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800443 *err = -ENOTSOCK;
444 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800445}
John Fastabend406a3c62012-07-20 10:39:25 +0000446EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700449 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 * @fd: file handle
451 * @err: pointer to an error code return
452 *
453 * The file handle passed in is locked and the socket it is bound
Rosen, Rami241c4662017-05-21 22:12:38 +0300454 * to is returned. If an error occurs the err pointer is overwritten
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 * with a negative errno code and NULL is returned. The function checks
456 * for both invalid handles and passing a handle which is not a socket.
457 *
458 * On a success the socket object pointer is returned.
459 */
460
461struct socket *sockfd_lookup(int fd, int *err)
462{
463 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 struct socket *sock;
465
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700466 file = fget(fd);
467 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 *err = -EBADF;
469 return NULL;
470 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700471
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800472 sock = sock_from_file(file, err);
473 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 return sock;
476}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700477EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800479static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
480{
Al Viro00e188e2014-03-03 23:48:18 -0500481 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800482 struct socket *sock;
483
Hua Zhong36725582006-04-19 15:25:02 -0700484 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500485 if (f.file) {
486 sock = sock_from_file(f.file, err);
487 if (likely(sock)) {
488 *fput_needed = f.flags;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800489 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500490 }
491 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800492 }
493 return NULL;
494}
495
Masatake YAMATO600e1772012-08-29 10:44:29 +0000496static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
497 size_t size)
498{
499 ssize_t len;
500 ssize_t used = 0;
501
David Howellsc5ef6032015-03-17 22:26:16 +0000502 len = security_inode_listsecurity(d_inode(dentry), buffer, size);
Masatake YAMATO600e1772012-08-29 10:44:29 +0000503 if (len < 0)
504 return len;
505 used += len;
506 if (buffer) {
507 if (size < used)
508 return -ERANGE;
509 buffer += len;
510 }
511
512 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
513 used += len;
514 if (buffer) {
515 if (size < used)
516 return -ERANGE;
517 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
518 buffer += len;
519 }
520
521 return used;
522}
523
Tobias Klauserdc647ec2017-01-10 09:30:51 +0100524static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr)
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900525{
526 int err = simple_setattr(dentry, iattr);
527
Eric Biggerse1a3a602016-12-30 17:42:32 -0600528 if (!err && (iattr->ia_valid & ATTR_UID)) {
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900529 struct socket *sock = SOCKET_I(d_inode(dentry));
530
Cong Wang6d8c50d2018-06-07 13:39:49 -0700531 if (sock->sk)
532 sock->sk->sk_uid = iattr->ia_uid;
533 else
534 err = -ENOENT;
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900535 }
536
537 return err;
538}
539
Masatake YAMATO600e1772012-08-29 10:44:29 +0000540static const struct inode_operations sockfs_inode_ops = {
Masatake YAMATO600e1772012-08-29 10:44:29 +0000541 .listxattr = sockfs_listxattr,
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900542 .setattr = sockfs_setattr,
Masatake YAMATO600e1772012-08-29 10:44:29 +0000543};
544
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300546 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700547 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 * Allocate a new inode and socket object. The two are bound together
549 * and initialised. The socket is then returned. If we are out of inodes
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300550 * NULL is returned. This functions uses GFP_KERNEL internally.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 */
552
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800553struct socket *sock_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700555 struct inode *inode;
556 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200558 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 if (!inode)
560 return NULL;
561
562 sock = SOCKET_I(inode);
563
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400564 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700565 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100566 inode->i_uid = current_fsuid();
567 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000568 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 return sock;
571}
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800572EXPORT_SYMBOL(sock_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300575 * sock_release - close a socket
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 * @sock: socket to close
577 *
578 * The socket is released from the protocol stack if it has a release
579 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700580 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700582
Cong Wang6d8c50d2018-06-07 13:39:49 -0700583static void __sock_release(struct socket *sock, struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584{
585 if (sock->ops) {
586 struct module *owner = sock->ops->owner;
587
Cong Wang6d8c50d2018-06-07 13:39:49 -0700588 if (inode)
589 inode_lock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 sock->ops->release(sock);
Eric Biggersff7b11a2019-02-21 14:13:56 -0800591 sock->sk = NULL;
Cong Wang6d8c50d2018-06-07 13:39:49 -0700592 if (inode)
593 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 sock->ops = NULL;
595 module_put(owner);
596 }
597
Al Viro333f7902019-07-05 20:14:16 +0100598 if (sock->wq.fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800599 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 if (!sock->file) {
602 iput(SOCK_INODE(sock));
603 return;
604 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700605 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606}
Cong Wang6d8c50d2018-06-07 13:39:49 -0700607
608void sock_release(struct socket *sock)
609{
610 __sock_release(sock, NULL);
611}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700612EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400614void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000615{
Eric Dumazet140c55d2014-08-06 11:49:29 +0200616 u8 flags = *tx_flags;
617
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400618 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200619 flags |= SKBTX_HW_TSTAMP;
620
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400621 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200622 flags |= SKBTX_SW_TSTAMP;
623
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400624 if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200625 flags |= SKBTX_SCHED_TSTAMP;
626
Eric Dumazet140c55d2014-08-06 11:49:29 +0200627 *tx_flags = flags;
Patrick Ohly20d49472009-02-12 05:03:38 +0000628}
Willem de Bruijn67cc0d42014-09-08 19:58:58 -0400629EXPORT_SYMBOL(__sock_tx_timestamp);
Patrick Ohly20d49472009-02-12 05:03:38 +0000630
Paolo Abeni8c3c4472019-05-03 17:01:39 +0200631INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *,
632 size_t));
Paolo Abenia648a592019-07-03 16:06:54 +0200633INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *,
634 size_t));
Al Virod8725c82014-12-11 00:02:50 -0500635static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636{
Paolo Abenia648a592019-07-03 16:06:54 +0200637 int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg,
638 inet_sendmsg, sock, msg,
639 msg_data_left(msg));
Al Virod8725c82014-12-11 00:02:50 -0500640 BUG_ON(ret == -EIOCBQUEUED);
641 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642}
Gu Zheng0cf00c62014-12-05 15:14:23 +0800643
Randy Dunlap85806af2019-05-18 21:23:07 -0700644/**
645 * sock_sendmsg - send a message through @sock
646 * @sock: socket
647 * @msg: message to send
648 *
649 * Sends @msg through @sock, passing through LSM.
650 * Returns the number of bytes sent, or an error code.
651 */
Al Virod8725c82014-12-11 00:02:50 -0500652int sock_sendmsg(struct socket *sock, struct msghdr *msg)
Gu Zheng0cf00c62014-12-05 15:14:23 +0800653{
Al Virod8725c82014-12-11 00:02:50 -0500654 int err = security_socket_sendmsg(sock, msg,
Al Viro01e97e62014-12-15 21:39:31 -0500655 msg_data_left(msg));
Ying Xue1b784142015-03-02 15:37:48 +0800656
Al Virod8725c82014-12-11 00:02:50 -0500657 return err ?: sock_sendmsg_nosec(sock, msg);
Gu Zheng0cf00c62014-12-05 15:14:23 +0800658}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700659EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300661/**
662 * kernel_sendmsg - send a message through @sock (kernel-space)
663 * @sock: socket
664 * @msg: message header
665 * @vec: kernel vec
666 * @num: vec array length
667 * @size: total message data size
668 *
669 * Builds the message data with @vec and sends it through @sock.
670 * Returns the number of bytes sent, or an error code.
671 */
672
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
674 struct kvec *vec, size_t num, size_t size)
675{
David Howellsaa563d72018-10-20 00:57:56 +0100676 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Al Virod8725c82014-12-11 00:02:50 -0500677 return sock_sendmsg(sock, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700679EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300681/**
682 * kernel_sendmsg_locked - send a message through @sock (kernel-space)
683 * @sk: sock
684 * @msg: message header
685 * @vec: output s/g array
686 * @num: output s/g array length
687 * @size: total message data size
688 *
689 * Builds the message data with @vec and sends it through @sock.
690 * Returns the number of bytes sent, or an error code.
691 * Caller must hold @sk.
692 */
693
Tom Herbert306b13e2017-07-28 16:22:41 -0700694int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
695 struct kvec *vec, size_t num, size_t size)
696{
697 struct socket *sock = sk->sk_socket;
698
699 if (!sock->ops->sendmsg_locked)
John Fastabenddb5980d2017-08-15 22:31:34 -0700700 return sock_no_sendmsg_locked(sk, msg, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700701
David Howellsaa563d72018-10-20 00:57:56 +0100702 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700703
704 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
705}
706EXPORT_SYMBOL(kernel_sendmsg_locked);
707
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400708static bool skb_is_err_queue(const struct sk_buff *skb)
709{
710 /* pkt_type of skbs enqueued on the error queue are set to
711 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
712 * in recvmsg, since skbs received on a local socket will never
713 * have a pkt_type of PACKET_OUTGOING.
714 */
715 return skb->pkt_type == PACKET_OUTGOING;
716}
717
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200718/* On transmit, software and hardware timestamps are returned independently.
719 * As the two skb clones share the hardware timestamp, which may be updated
720 * before the software timestamp is received, a hardware TX timestamp may be
721 * returned only if there is no software TX timestamp. Ignore false software
722 * timestamps, which may be made in the __sock_recv_timestamp() call when the
Deepa Dinamani7f1bc6e2019-02-02 07:34:46 -0800723 * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200724 * hardware timestamp.
725 */
726static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
727{
728 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb);
729}
730
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200731static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb)
732{
733 struct scm_ts_pktinfo ts_pktinfo;
734 struct net_device *orig_dev;
735
736 if (!skb_mac_header_was_set(skb))
737 return;
738
739 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo));
740
741 rcu_read_lock();
742 orig_dev = dev_get_by_napi_id(skb_napi_id(skb));
743 if (orig_dev)
744 ts_pktinfo.if_index = orig_dev->ifindex;
745 rcu_read_unlock();
746
747 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb);
748 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
749 sizeof(ts_pktinfo), &ts_pktinfo);
750}
751
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700752/*
753 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
754 */
755void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
756 struct sk_buff *skb)
757{
Patrick Ohly20d49472009-02-12 05:03:38 +0000758 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Deepa Dinamani887feae2019-02-02 07:34:50 -0800759 int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW);
Deepa Dinamani97184752019-02-02 07:34:51 -0800760 struct scm_timestamping_internal tss;
761
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200762 int empty = 1, false_tstamp = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000763 struct skb_shared_hwtstamps *shhwtstamps =
764 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700765
Patrick Ohly20d49472009-02-12 05:03:38 +0000766 /* Race occurred between timestamp enabling and packet
767 receiving. Fill in the current time for now. */
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200768 if (need_software_tstamp && skb->tstamp == 0) {
Patrick Ohly20d49472009-02-12 05:03:38 +0000769 __net_timestamp(skb);
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200770 false_tstamp = 1;
771 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000772
773 if (need_software_tstamp) {
774 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800775 if (new_tstamp) {
776 struct __kernel_sock_timeval tv;
777
778 skb_get_new_timestamp(skb, &tv);
779 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
780 sizeof(tv), &tv);
781 } else {
782 struct __kernel_old_timeval tv;
783
784 skb_get_timestamp(skb, &tv);
785 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
786 sizeof(tv), &tv);
787 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000788 } else {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800789 if (new_tstamp) {
790 struct __kernel_timespec ts;
791
792 skb_get_new_timestampns(skb, &ts);
793 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
794 sizeof(ts), &ts);
795 } else {
796 struct timespec ts;
797
798 skb_get_timestampns(skb, &ts);
799 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
800 sizeof(ts), &ts);
801 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000802 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700803 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000804
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400805 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400806 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Deepa Dinamani97184752019-02-02 07:34:51 -0800807 ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000808 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400809 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400810 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200811 !skb_is_swtx_tstamp(skb, false_tstamp) &&
Deepa Dinamani97184752019-02-02 07:34:51 -0800812 ktime_to_timespec64_cond(shhwtstamps->hwtstamp, tss.ts + 2)) {
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400813 empty = 0;
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200814 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&
815 !skb_is_err_queue(skb))
816 put_ts_pktinfo(msg, skb);
817 }
Francis Yan1c885802016-11-27 23:07:18 -0800818 if (!empty) {
Deepa Dinamani97184752019-02-02 07:34:51 -0800819 if (sock_flag(sk, SOCK_TSTAMP_NEW))
820 put_cmsg_scm_timestamping64(msg, &tss);
821 else
822 put_cmsg_scm_timestamping(msg, &tss);
Francis Yan1c885802016-11-27 23:07:18 -0800823
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400824 if (skb_is_err_queue(skb) && skb->len &&
Soheil Hassas Yeganeh4ef1b282017-03-18 17:03:00 -0400825 SKB_EXT_ERR(skb)->opt_stats)
Francis Yan1c885802016-11-27 23:07:18 -0800826 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
827 skb->len, skb->data);
828 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700829}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300830EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
831
Johannes Berg6e3e9392011-11-09 10:15:42 +0100832void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
833 struct sk_buff *skb)
834{
835 int ack;
836
837 if (!sock_flag(sk, SOCK_WIFI_STATUS))
838 return;
839 if (!skb->wifi_acked_valid)
840 return;
841
842 ack = skb->wifi_acked;
843
844 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
845}
846EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
847
stephen hemminger11165f12010-10-18 14:27:29 +0000848static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
849 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700850{
Eyal Birger744d5a32015-03-01 14:58:31 +0200851 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
Neil Horman3b885782009-10-12 13:26:31 -0700852 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
Eyal Birger744d5a32015-03-01 14:58:31 +0200853 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
Neil Horman3b885782009-10-12 13:26:31 -0700854}
855
Eric Dumazet767dd032010-04-28 19:14:43 +0000856void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700857 struct sk_buff *skb)
858{
859 sock_recv_timestamp(msg, sk, skb);
860 sock_recv_drops(msg, sk, skb);
861}
Eric Dumazet767dd032010-04-28 19:14:43 +0000862EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700863
Paolo Abeni8c3c4472019-05-03 17:01:39 +0200864INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *,
Paolo Abenia648a592019-07-03 16:06:54 +0200865 size_t, int));
866INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *,
867 size_t, int));
Ying Xue1b784142015-03-02 15:37:48 +0800868static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
Al Viro2da62902015-03-14 21:13:46 -0400869 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870{
Paolo Abenia648a592019-07-03 16:06:54 +0200871 return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg,
872 inet_recvmsg, sock, msg, msg_data_left(msg),
873 flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874}
875
Randy Dunlap85806af2019-05-18 21:23:07 -0700876/**
877 * sock_recvmsg - receive a message from @sock
878 * @sock: socket
879 * @msg: message to receive
880 * @flags: message flags
881 *
882 * Receives @msg from @sock, passing through LSM. Returns the total number
883 * of bytes received, or an error.
884 */
Al Viro2da62902015-03-14 21:13:46 -0400885int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700886{
Al Viro2da62902015-03-14 21:13:46 -0400887 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700888
Al Viro2da62902015-03-14 21:13:46 -0400889 return err ?: sock_recvmsg_nosec(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700891EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000893/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300894 * kernel_recvmsg - Receive a message from a socket (kernel space)
895 * @sock: The socket to receive the message from
896 * @msg: Received message
897 * @vec: Input s/g array for message data
898 * @num: Size of input s/g array
899 * @size: Number of bytes to read
900 * @flags: Message flags (MSG_DONTWAIT, etc...)
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000901 *
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300902 * On return the msg structure contains the scatter/gather array passed in the
903 * vec argument. The array is modified so that it consists of the unfilled
904 * portion of the original array.
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000905 *
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300906 * The returned value is the total number of bytes received, or an error.
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000907 */
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300908
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700909int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
910 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911{
912 mm_segment_t oldfs = get_fs();
913 int result;
914
David Howellsaa563d72018-10-20 00:57:56 +0100915 iov_iter_kvec(&msg->msg_iter, READ, vec, num, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 set_fs(KERNEL_DS);
Al Viro2da62902015-03-14 21:13:46 -0400917 result = sock_recvmsg(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 set_fs(oldfs);
919 return result;
920}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700921EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300923static ssize_t sock_sendpage(struct file *file, struct page *page,
924 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925{
926 struct socket *sock;
927 int flags;
928
Eric Dumazetb69aee02005-09-06 14:42:45 -0700929 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
Eric Dumazet35f9c092012-04-05 03:05:35 +0000931 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
932 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
933 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
Linus Torvaldse6949582009-08-13 08:28:36 -0700935 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936}
937
Jens Axboe9c55e012007-11-06 23:30:13 -0800938static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700939 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800940 unsigned int flags)
941{
942 struct socket *sock = file->private_data;
943
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800944 if (unlikely(!sock->ops->splice_read))
Slavomir Kaslev95506582018-11-16 11:27:53 +0200945 return generic_file_splice_read(file, ppos, pipe, len, flags);
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800946
Jens Axboe9c55e012007-11-06 23:30:13 -0800947 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
948}
949
Al Viro8ae5e0302014-11-28 19:40:50 -0500950static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800951{
Al Viro6d652332015-01-30 16:12:56 -0500952 struct file *file = iocb->ki_filp;
953 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700954 struct msghdr msg = {.msg_iter = *to,
955 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -0500956 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800957
Al Viro8ae5e0302014-11-28 19:40:50 -0500958 if (file->f_flags & O_NONBLOCK)
959 msg.msg_flags = MSG_DONTWAIT;
960
961 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800962 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700963
Christoph Hellwig66ee59a2015-02-11 19:56:46 +0100964 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800965 return 0;
966
Al Viro2da62902015-03-14 21:13:46 -0400967 res = sock_recvmsg(sock, &msg, msg.msg_flags);
Al Viro8ae5e0302014-11-28 19:40:50 -0500968 *to = msg.msg_iter;
969 return res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800970}
971
Al Viro8ae5e0302014-11-28 19:40:50 -0500972static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973{
Al Viro6d652332015-01-30 16:12:56 -0500974 struct file *file = iocb->ki_filp;
975 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700976 struct msghdr msg = {.msg_iter = *from,
977 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -0500978 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800979
Al Viro8ae5e0302014-11-28 19:40:50 -0500980 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800981 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700982
Al Viro8ae5e0302014-11-28 19:40:50 -0500983 if (file->f_flags & O_NONBLOCK)
984 msg.msg_flags = MSG_DONTWAIT;
985
Al Viro6d652332015-01-30 16:12:56 -0500986 if (sock->type == SOCK_SEQPACKET)
987 msg.msg_flags |= MSG_EOR;
988
Al Virod8725c82014-12-11 00:02:50 -0500989 res = sock_sendmsg(sock, &msg);
Al Viro8ae5e0302014-11-28 19:40:50 -0500990 *from = msg.msg_iter;
991 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992}
993
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994/*
995 * Atomic setting of ioctl hooks to avoid race
996 * with module unload.
997 */
998
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800999static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001000static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
Eric W. Biederman881d9662007-09-17 11:56:21 -07001002void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001004 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001006 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007}
1008EXPORT_SYMBOL(brioctl_set);
1009
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001010static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -07001011static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
Eric W. Biederman881d9662007-09-17 11:56:21 -07001013void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001015 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001017 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018}
1019EXPORT_SYMBOL(vlan_ioctl_set);
1020
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001021static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001022static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001024void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001026 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001028 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029}
1030EXPORT_SYMBOL(dlci_ioctl_set);
1031
Arnd Bergmann6b960182009-11-06 23:10:54 -08001032static long sock_do_ioctl(struct net *net, struct socket *sock,
Johannes Berg63ff03a2019-01-25 22:43:17 +01001033 unsigned int cmd, unsigned long arg)
Arnd Bergmann6b960182009-11-06 23:10:54 -08001034{
1035 int err;
1036 void __user *argp = (void __user *)arg;
1037
1038 err = sock->ops->ioctl(sock, cmd, arg);
1039
1040 /*
1041 * If this ioctl is unknown try to hand it down
1042 * to the NIC driver.
1043 */
Al Viro36fd6332017-06-26 13:19:16 -04001044 if (err != -ENOIOCTLCMD)
1045 return err;
Arnd Bergmann6b960182009-11-06 23:10:54 -08001046
Al Viro36fd6332017-06-26 13:19:16 -04001047 if (cmd == SIOCGIFCONF) {
1048 struct ifconf ifc;
1049 if (copy_from_user(&ifc, argp, sizeof(struct ifconf)))
1050 return -EFAULT;
1051 rtnl_lock();
1052 err = dev_ifconf(net, &ifc, sizeof(struct ifreq));
1053 rtnl_unlock();
1054 if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf)))
1055 err = -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04001056 } else {
1057 struct ifreq ifr;
1058 bool need_copyout;
Johannes Berg63ff03a2019-01-25 22:43:17 +01001059 if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
Al Viro44c02a22017-10-05 12:59:44 -04001060 return -EFAULT;
1061 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
1062 if (!err && need_copyout)
Johannes Berg63ff03a2019-01-25 22:43:17 +01001063 if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
Al Viro44c02a22017-10-05 12:59:44 -04001064 return -EFAULT;
Al Viro36fd6332017-06-26 13:19:16 -04001065 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08001066 return err;
1067}
1068
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069/*
1070 * With an ioctl, arg may well be a user mode pointer, but we don't know
1071 * what to do with it - that's up to the protocol still.
1072 */
1073
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001074/**
1075 * get_net_ns - increment the refcount of the network namespace
1076 * @ns: common namespace (net)
1077 *
1078 * Returns the net's common namespace.
1079 */
1080
Kirill Tkhaid8d211a2018-02-14 16:39:56 +03001081struct ns_common *get_net_ns(struct ns_common *ns)
Andrey Vaginc62cce22016-10-24 18:29:13 -07001082{
1083 return &get_net(container_of(ns, struct net, ns))->ns;
1084}
Kirill Tkhaid8d211a2018-02-14 16:39:56 +03001085EXPORT_SYMBOL_GPL(get_net_ns);
Andrey Vaginc62cce22016-10-24 18:29:13 -07001086
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1088{
1089 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001090 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 void __user *argp = (void __user *)arg;
1092 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001093 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094
Eric Dumazetb69aee02005-09-06 14:42:45 -07001095 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001096 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001097 net = sock_net(sk);
Al Viro44c02a22017-10-05 12:59:44 -04001098 if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
1099 struct ifreq ifr;
1100 bool need_copyout;
1101 if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
1102 return -EFAULT;
1103 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
1104 if (!err && need_copyout)
1105 if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
1106 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001108#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Al Virob1b0c242017-10-01 20:13:08 -04001110 err = wext_handle_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001112#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001113 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 case FIOSETOWN:
1115 case SIOCSPGRP:
1116 err = -EFAULT;
1117 if (get_user(pid, (int __user *)argp))
1118 break;
Jiri Slaby393cc3f2017-06-13 13:35:50 +02001119 err = f_setown(sock->file, pid, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 break;
1121 case FIOGETOWN:
1122 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001123 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001124 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 break;
1126 case SIOCGIFBR:
1127 case SIOCSIFBR:
1128 case SIOCBRADDBR:
1129 case SIOCBRDELBR:
1130 err = -ENOPKG;
1131 if (!br_ioctl_hook)
1132 request_module("bridge");
1133
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001134 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001135 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001136 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001137 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 break;
1139 case SIOCGIFVLAN:
1140 case SIOCSIFVLAN:
1141 err = -ENOPKG;
1142 if (!vlan_ioctl_hook)
1143 request_module("8021q");
1144
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001145 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001147 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001148 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 case SIOCADDDLCI:
1151 case SIOCDELDLCI:
1152 err = -ENOPKG;
1153 if (!dlci_ioctl_hook)
1154 request_module("dlci");
1155
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001156 mutex_lock(&dlci_ioctl_mutex);
1157 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001159 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 break;
Andrey Vaginc62cce22016-10-24 18:29:13 -07001161 case SIOCGSKNS:
1162 err = -EPERM;
1163 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1164 break;
1165
1166 err = open_related_ns(&net->ns, get_net_ns);
1167 break;
Arnd Bergmann0768e172019-04-17 22:56:11 +02001168 case SIOCGSTAMP_OLD:
1169 case SIOCGSTAMPNS_OLD:
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02001170 if (!sock->ops->gettstamp) {
1171 err = -ENOIOCTLCMD;
1172 break;
1173 }
1174 err = sock->ops->gettstamp(sock, argp,
Arnd Bergmann0768e172019-04-17 22:56:11 +02001175 cmd == SIOCGSTAMP_OLD,
1176 !IS_ENABLED(CONFIG_64BIT));
Gustavo A. R. Silva60747822019-04-24 10:31:24 -05001177 break;
Arnd Bergmann0768e172019-04-17 22:56:11 +02001178 case SIOCGSTAMP_NEW:
1179 case SIOCGSTAMPNS_NEW:
1180 if (!sock->ops->gettstamp) {
1181 err = -ENOIOCTLCMD;
1182 break;
1183 }
1184 err = sock->ops->gettstamp(sock, argp,
1185 cmd == SIOCGSTAMP_NEW,
1186 false);
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02001187 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 default:
Johannes Berg63ff03a2019-01-25 22:43:17 +01001189 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001191 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 return err;
1193}
1194
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001195/**
1196 * sock_create_lite - creates a socket
1197 * @family: protocol family (AF_INET, ...)
1198 * @type: communication type (SOCK_STREAM, ...)
1199 * @protocol: protocol (0, ...)
1200 * @res: new socket
1201 *
1202 * Creates a new socket and assigns it to @res, passing through LSM.
1203 * The new socket initialization is not complete, see kernel_accept().
1204 * Returns 0 or an error. On failure @res is set to %NULL.
1205 * This function internally uses GFP_KERNEL.
1206 */
1207
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208int sock_create_lite(int family, int type, int protocol, struct socket **res)
1209{
1210 int err;
1211 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001212
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 err = security_socket_create(family, type, protocol, 1);
1214 if (err)
1215 goto out;
1216
1217 sock = sock_alloc();
1218 if (!sock) {
1219 err = -ENOMEM;
1220 goto out;
1221 }
1222
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001224 err = security_socket_post_create(sock, family, type, protocol, 1);
1225 if (err)
1226 goto out_release;
1227
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228out:
1229 *res = sock;
1230 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001231out_release:
1232 sock_release(sock);
1233 sock = NULL;
1234 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001236EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237
1238/* No kernel lock held - perfect */
Al Viroade994f2017-07-03 00:01:49 -04001239static __poll_t sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240{
Christoph Hellwig3cafb372018-01-09 16:07:34 +01001241 struct socket *sock = file->private_data;
Christoph Hellwiga331de32018-07-30 09:42:13 +02001242 __poll_t events = poll_requested_events(wait), flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243
Christoph Hellwige88958e2018-06-29 15:37:24 +02001244 if (!sock->ops->poll)
1245 return 0;
Christoph Hellwigf641f13b2018-07-30 09:42:12 +02001246
Christoph Hellwiga331de32018-07-30 09:42:13 +02001247 if (sk_can_busy_loop(sock->sk)) {
1248 /* poll once if requested by the syscall */
1249 if (events & POLL_BUSY_LOOP)
1250 sk_busy_loop(sock->sk, 1);
1251
1252 /* if this socket can poll_ll, tell the system call */
1253 flag = POLL_BUSY_LOOP;
1254 }
1255
1256 return sock->ops->poll(file, sock, wait) | flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257}
1258
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001259static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001261 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262
1263 return sock->ops->mmap(file, sock, vma);
1264}
1265
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001266static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267{
Cong Wang6d8c50d2018-06-07 13:39:49 -07001268 __sock_release(SOCKET_I(inode), inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 return 0;
1270}
1271
1272/*
1273 * Update the socket async list
1274 *
1275 * Fasync_list locking strategy.
1276 *
1277 * 1. fasync_list is modified only under process context socket lock
1278 * i.e. under semaphore.
1279 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001280 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 */
1282
1283static int sock_fasync(int fd, struct file *filp, int on)
1284{
Eric Dumazet989a2972010-04-14 09:55:35 +00001285 struct socket *sock = filp->private_data;
1286 struct sock *sk = sock->sk;
Al Viro333f7902019-07-05 20:14:16 +01001287 struct socket_wq *wq = &sock->wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288
Eric Dumazet989a2972010-04-14 09:55:35 +00001289 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291
1292 lock_sock(sk);
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001293 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001295 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001296 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001297 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001298 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299
Eric Dumazet989a2972010-04-14 09:55:35 +00001300 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 return 0;
1302}
1303
Eric Dumazetceb5d582015-11-29 20:03:11 -08001304/* This function may be called only under rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305
Eric Dumazetceb5d582015-11-29 20:03:11 -08001306int sock_wake_async(struct socket_wq *wq, int how, int band)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307{
Eric Dumazetceb5d582015-11-29 20:03:11 -08001308 if (!wq || !wq->fasync_list)
1309 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001310
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001311 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001312 case SOCK_WAKE_WAITD:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001313 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 break;
1315 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001316 case SOCK_WAKE_SPACE:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001317 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 break;
1319 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001320 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001321call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001322 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001324 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001325 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08001327
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 return 0;
1329}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001330EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001332/**
1333 * __sock_create - creates a socket
1334 * @net: net namespace
1335 * @family: protocol family (AF_INET, ...)
1336 * @type: communication type (SOCK_STREAM, ...)
1337 * @protocol: protocol (0, ...)
1338 * @res: new socket
1339 * @kern: boolean for kernel space sockets
1340 *
1341 * Creates a new socket and assigns it to @res, passing through LSM.
1342 * Returns 0 or an error. On failure @res is set to %NULL. @kern must
1343 * be set to true if the socket resides in kernel space.
1344 * This function internally uses GFP_KERNEL.
1345 */
1346
Pavel Emelyanov721db932010-09-29 16:06:32 +04001347int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001348 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349{
1350 int err;
1351 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001352 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353
1354 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001355 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 */
1357 if (family < 0 || family >= NPROTO)
1358 return -EAFNOSUPPORT;
1359 if (type < 0 || type >= SOCK_MAX)
1360 return -EINVAL;
1361
1362 /* Compatibility.
1363
1364 This uglymoron is moved from INET layer to here to avoid
1365 deadlock in module load.
1366 */
1367 if (family == PF_INET && type == SOCK_PACKET) {
liping.zhangf3c98692016-03-11 23:08:36 +08001368 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1369 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 family = PF_PACKET;
1371 }
1372
1373 err = security_socket_create(family, type, protocol, kern);
1374 if (err)
1375 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001376
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001377 /*
1378 * Allocate the socket and allow the family to set things up. if
1379 * the protocol is 0, the family is instructed to select an appropriate
1380 * default.
1381 */
1382 sock = sock_alloc();
1383 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001384 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001385 return -ENFILE; /* Not exactly a match, but its the
1386 closest posix thing */
1387 }
1388
1389 sock->type = type;
1390
Johannes Berg95a5afc2008-10-16 15:24:51 -07001391#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001392 /* Attempt to load a protocol module if the find failed.
1393 *
1394 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 * requested real, full-featured networking support upon configuration.
1396 * Otherwise module support will break!
1397 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001398 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001399 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400#endif
1401
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001402 rcu_read_lock();
1403 pf = rcu_dereference(net_families[family]);
1404 err = -EAFNOSUPPORT;
1405 if (!pf)
1406 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407
1408 /*
1409 * We will call the ->create function, that possibly is in a loadable
1410 * module, so we have to bump that loadable module refcnt first.
1411 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001412 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 goto out_release;
1414
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001415 /* Now protected by module ref count */
1416 rcu_read_unlock();
1417
Eric Paris3f378b62009-11-05 22:18:14 -08001418 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001419 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001421
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 /*
1423 * Now to bump the refcnt of the [loadable] module that owns this
1424 * socket at sock_release time we decrement its refcnt.
1425 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001426 if (!try_module_get(sock->ops->owner))
1427 goto out_module_busy;
1428
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 /*
1430 * Now that we're done with the ->create function, the [loadable]
1431 * module can have its refcnt decremented
1432 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001433 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001434 err = security_socket_post_create(sock, family, type, protocol, kern);
1435 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001436 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001437 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001439 return 0;
1440
1441out_module_busy:
1442 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001444 sock->ops = NULL;
1445 module_put(pf->owner);
1446out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001448 return err;
1449
1450out_release:
1451 rcu_read_unlock();
1452 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001454EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001456/**
1457 * sock_create - creates a socket
1458 * @family: protocol family (AF_INET, ...)
1459 * @type: communication type (SOCK_STREAM, ...)
1460 * @protocol: protocol (0, ...)
1461 * @res: new socket
1462 *
1463 * A wrapper around __sock_create().
1464 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1465 */
1466
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467int sock_create(int family, int type, int protocol, struct socket **res)
1468{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001469 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001471EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001473/**
1474 * sock_create_kern - creates a socket (kernel space)
1475 * @net: net namespace
1476 * @family: protocol family (AF_INET, ...)
1477 * @type: communication type (SOCK_STREAM, ...)
1478 * @protocol: protocol (0, ...)
1479 * @res: new socket
1480 *
1481 * A wrapper around __sock_create().
1482 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1483 */
1484
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001485int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486{
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001487 return __sock_create(net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001489EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001491int __sys_socket(int family, int type, int protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492{
1493 int retval;
1494 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001495 int flags;
1496
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001497 /* Check the SOCK_* constants for consistency. */
1498 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1499 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1500 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1501 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1502
Ulrich Dreppera677a032008-07-23 21:29:17 -07001503 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001504 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001505 return -EINVAL;
1506 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001508 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1509 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1510
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 retval = sock_create(family, type, protocol, &sock);
1512 if (retval < 0)
Al Viro8e1611e2017-12-05 23:29:09 +00001513 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514
Al Viro8e1611e2017-12-05 23:29:09 +00001515 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516}
1517
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001518SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1519{
1520 return __sys_socket(family, type, protocol);
1521}
1522
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523/*
1524 * Create a pair of connected sockets.
1525 */
1526
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001527int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528{
1529 struct socket *sock1, *sock2;
1530 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001531 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001532 int flags;
1533
1534 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001535 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001536 return -EINVAL;
1537 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001539 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1540 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1541
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 /*
Al Viro016a2662017-12-05 23:28:38 +00001543 * reserve descriptors and make sure we won't fail
1544 * to return them to userland.
1545 */
1546 fd1 = get_unused_fd_flags(flags);
1547 if (unlikely(fd1 < 0))
1548 return fd1;
1549
1550 fd2 = get_unused_fd_flags(flags);
1551 if (unlikely(fd2 < 0)) {
1552 put_unused_fd(fd1);
1553 return fd2;
1554 }
1555
1556 err = put_user(fd1, &usockvec[0]);
1557 if (err)
1558 goto out;
1559
1560 err = put_user(fd2, &usockvec[1]);
1561 if (err)
1562 goto out;
1563
1564 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 * Obtain the first socket and check if the underlying protocol
1566 * supports the socketpair call.
1567 */
1568
1569 err = sock_create(family, type, protocol, &sock1);
Al Viro016a2662017-12-05 23:28:38 +00001570 if (unlikely(err < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571 goto out;
1572
1573 err = sock_create(family, type, protocol, &sock2);
Al Viro016a2662017-12-05 23:28:38 +00001574 if (unlikely(err < 0)) {
1575 sock_release(sock1);
1576 goto out;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001577 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001578
David Herrmannd47cd942018-05-04 16:28:20 +02001579 err = security_socket_socketpair(sock1, sock2);
1580 if (unlikely(err)) {
1581 sock_release(sock2);
1582 sock_release(sock1);
1583 goto out;
1584 }
1585
Al Viro016a2662017-12-05 23:28:38 +00001586 err = sock1->ops->socketpair(sock1, sock2);
1587 if (unlikely(err < 0)) {
1588 sock_release(sock2);
1589 sock_release(sock1);
1590 goto out;
Al Viro28407632012-08-17 23:54:15 -04001591 }
1592
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001593 newfile1 = sock_alloc_file(sock1, flags, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301594 if (IS_ERR(newfile1)) {
Al Viro28407632012-08-17 23:54:15 -04001595 err = PTR_ERR(newfile1);
Al Viro016a2662017-12-05 23:28:38 +00001596 sock_release(sock2);
1597 goto out;
Al Viro28407632012-08-17 23:54:15 -04001598 }
1599
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001600 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001601 if (IS_ERR(newfile2)) {
1602 err = PTR_ERR(newfile2);
Al Viro016a2662017-12-05 23:28:38 +00001603 fput(newfile1);
1604 goto out;
Al Virodb349502007-02-07 01:48:00 -05001605 }
1606
Al Viro157cf642008-12-14 04:57:47 -05001607 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001608
Al Virodb349502007-02-07 01:48:00 -05001609 fd_install(fd1, newfile1);
1610 fd_install(fd2, newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001611 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613out:
Al Viro016a2662017-12-05 23:28:38 +00001614 put_unused_fd(fd2);
1615 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 return err;
1617}
1618
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001619SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1620 int __user *, usockvec)
1621{
1622 return __sys_socketpair(family, type, protocol, usockvec);
1623}
1624
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625/*
1626 * Bind a name to a socket. Nothing much to do here since it's
1627 * the protocol's responsibility to handle the local address.
1628 *
1629 * We move the socket address to kernel space before we call
1630 * the protocol layer (having also checked the address is ok).
1631 */
1632
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001633int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634{
1635 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001636 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001637 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001639 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001640 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001641 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Jakub Sitnicki068b88c2018-10-04 11:09:40 +02001642 if (!err) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001643 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001644 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001645 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001646 if (!err)
1647 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001648 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001649 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001651 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001652 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653 return err;
1654}
1655
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001656SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1657{
1658 return __sys_bind(fd, umyaddr, addrlen);
1659}
1660
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661/*
1662 * Perform a listen. Basically, we allow the protocol to do anything
1663 * necessary for a listen, and if that works, we mark the socket as
1664 * ready for listening.
1665 */
1666
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001667int __sys_listen(int fd, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668{
1669 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001670 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001671 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001672
1673 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1674 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001675 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001676 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001677 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678
1679 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001680 if (!err)
1681 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001683 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 }
1685 return err;
1686}
1687
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001688SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1689{
1690 return __sys_listen(fd, backlog);
1691}
1692
Jens Axboede2ea4b2019-10-17 14:41:29 -06001693int __sys_accept4_file(struct file *file, unsigned file_flags,
1694 struct sockaddr __user *upeer_sockaddr,
1695 int __user *upeer_addrlen, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696{
1697 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001698 struct file *newfile;
Jens Axboede2ea4b2019-10-17 14:41:29 -06001699 int err, len, newfd;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001700 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701
Ulrich Drepper77d27202008-07-23 21:29:35 -07001702 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001703 return -EINVAL;
1704
1705 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1706 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1707
Jens Axboede2ea4b2019-10-17 14:41:29 -06001708 sock = sock_from_file(file, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 if (!sock)
1710 goto out;
1711
1712 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001713 newsock = sock_alloc();
1714 if (!newsock)
Jens Axboede2ea4b2019-10-17 14:41:29 -06001715 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716
1717 newsock->type = sock->type;
1718 newsock->ops = sock->ops;
1719
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 /*
1721 * We don't need try_module_get here, as the listening socket (sock)
1722 * has the protocol module (sock->ops->owner) held.
1723 */
1724 __module_get(newsock->ops->owner);
1725
Al Viro28407632012-08-17 23:54:15 -04001726 newfd = get_unused_fd_flags(flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001727 if (unlikely(newfd < 0)) {
1728 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001729 sock_release(newsock);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001730 goto out;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001731 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001732 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301733 if (IS_ERR(newfile)) {
Al Viro28407632012-08-17 23:54:15 -04001734 err = PTR_ERR(newfile);
1735 put_unused_fd(newfd);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001736 goto out;
Al Viro28407632012-08-17 23:54:15 -04001737 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001738
Frank Filza79af592005-09-27 15:23:38 -07001739 err = security_socket_accept(sock, newsock);
1740 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001741 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001742
Jens Axboede2ea4b2019-10-17 14:41:29 -06001743 err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags,
1744 false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001746 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747
1748 if (upeer_sockaddr) {
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001749 len = newsock->ops->getname(newsock,
1750 (struct sockaddr *)&address, 2);
1751 if (len < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001753 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001755 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001756 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001758 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759 }
1760
1761 /* File flags are not inherited via accept() unlike another OSes. */
1762
David S. Miller39d8c1b2006-03-20 17:13:49 -08001763 fd_install(newfd, newfile);
1764 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765out:
1766 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001767out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001768 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001769 put_unused_fd(newfd);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001770 goto out;
1771
1772}
1773
1774/*
1775 * For accept, we attempt to create a new socket, set up the link
1776 * with the client, wake up the client, then return the new
1777 * connected fd. We collect the address of the connector in kernel
1778 * space and move it to user at the very end. This is unclean because
1779 * we open the socket then return an error.
1780 *
1781 * 1003.1g adds the ability to recvmsg() to query connection pending
1782 * status to recvmsg. We need to add that support in a way thats
1783 * clean when we restructure accept also.
1784 */
1785
1786int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
1787 int __user *upeer_addrlen, int flags)
1788{
1789 int ret = -EBADF;
1790 struct fd f;
1791
1792 f = fdget(fd);
1793 if (f.file) {
1794 ret = __sys_accept4_file(f.file, 0, upeer_sockaddr,
1795 upeer_addrlen, flags);
1796 if (f.flags)
1797 fput(f.file);
1798 }
1799
1800 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801}
1802
Dominik Brodowski4541e802018-03-13 19:24:23 +01001803SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1804 int __user *, upeer_addrlen, int, flags)
1805{
1806 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
1807}
1808
Heiko Carstens20f37032009-01-14 14:14:23 +01001809SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1810 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001811{
Dominik Brodowski4541e802018-03-13 19:24:23 +01001812 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001813}
1814
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815/*
1816 * Attempt to connect to a socket with the server address. The address
1817 * is in user space so we verify it is OK and move it to kernel space.
1818 *
1819 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1820 * break bindings
1821 *
1822 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1823 * other SEQPACKET protocols that take time to connect() as it doesn't
1824 * include the -EINPROGRESS status for such sockets.
1825 */
1826
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01001827int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828{
1829 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001830 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001831 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001833 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834 if (!sock)
1835 goto out;
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001836 err = move_addr_to_kernel(uservaddr, addrlen, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837 if (err < 0)
1838 goto out_put;
1839
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001840 err =
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001841 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842 if (err)
1843 goto out_put;
1844
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001845 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846 sock->file->f_flags);
1847out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001848 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849out:
1850 return err;
1851}
1852
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01001853SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1854 int, addrlen)
1855{
1856 return __sys_connect(fd, uservaddr, addrlen);
1857}
1858
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859/*
1860 * Get the local address ('name') of a socket object. Move the obtained
1861 * name to user space.
1862 */
1863
Dominik Brodowski8882a102018-03-13 19:43:14 +01001864int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1865 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866{
1867 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001868 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001869 int err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001870
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001871 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 if (!sock)
1873 goto out;
1874
1875 err = security_socket_getsockname(sock);
1876 if (err)
1877 goto out_put;
1878
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001879 err = sock->ops->getname(sock, (struct sockaddr *)&address, 0);
1880 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881 goto out_put;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001882 /* "err" is actually length in this case */
1883 err = move_addr_to_user(&address, err, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884
1885out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001886 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887out:
1888 return err;
1889}
1890
Dominik Brodowski8882a102018-03-13 19:43:14 +01001891SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1892 int __user *, usockaddr_len)
1893{
1894 return __sys_getsockname(fd, usockaddr, usockaddr_len);
1895}
1896
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897/*
1898 * Get the remote address ('name') of a socket object. Move the obtained
1899 * name to user space.
1900 */
1901
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001902int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1903 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904{
1905 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001906 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001907 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001909 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1910 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 err = security_socket_getpeername(sock);
1912 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001913 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 return err;
1915 }
1916
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001917 err = sock->ops->getname(sock, (struct sockaddr *)&address, 1);
1918 if (err >= 0)
1919 /* "err" is actually length in this case */
1920 err = move_addr_to_user(&address, err, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001921 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001922 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923 }
1924 return err;
1925}
1926
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001927SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1928 int __user *, usockaddr_len)
1929{
1930 return __sys_getpeername(fd, usockaddr, usockaddr_len);
1931}
1932
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933/*
1934 * Send a datagram to a given address. We move the address into kernel
1935 * space and check the user space data area is readable before invoking
1936 * the protocol.
1937 */
Dominik Brodowski211b6342018-03-13 19:18:52 +01001938int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
1939 struct sockaddr __user *addr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940{
1941 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001942 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943 int err;
1944 struct msghdr msg;
1945 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001946 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001947
Al Viro602bd0e2015-03-21 19:12:32 -04001948 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
1949 if (unlikely(err))
1950 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001951 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1952 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001953 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001954
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001955 msg.msg_name = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001956 msg.msg_control = NULL;
1957 msg.msg_controllen = 0;
1958 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001959 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001960 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 if (err < 0)
1962 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001963 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001964 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965 }
1966 if (sock->file->f_flags & O_NONBLOCK)
1967 flags |= MSG_DONTWAIT;
1968 msg.msg_flags = flags;
Al Virod8725c82014-12-11 00:02:50 -05001969 err = sock_sendmsg(sock, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001970
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001971out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001972 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001973out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974 return err;
1975}
1976
Dominik Brodowski211b6342018-03-13 19:18:52 +01001977SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1978 unsigned int, flags, struct sockaddr __user *, addr,
1979 int, addr_len)
1980{
1981 return __sys_sendto(fd, buff, len, flags, addr, addr_len);
1982}
1983
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001985 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001986 */
1987
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001988SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001989 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990{
Dominik Brodowski211b6342018-03-13 19:18:52 +01001991 return __sys_sendto(fd, buff, len, flags, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992}
1993
1994/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001995 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001996 * sender. We verify the buffers are writable and if needed move the
1997 * sender address from kernel to user space.
1998 */
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01001999int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
2000 struct sockaddr __user *addr, int __user *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001{
2002 struct socket *sock;
2003 struct iovec iov;
2004 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002005 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002006 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002007 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008
Al Viro602bd0e2015-03-21 19:12:32 -04002009 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
2010 if (unlikely(err))
2011 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002012 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002014 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002015
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002016 msg.msg_control = NULL;
2017 msg.msg_controllen = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002018 /* Save some cycles and don't copy the address if not needed */
2019 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
2020 /* We assume all kernel code knows the size of sockaddr_storage */
2021 msg.msg_namelen = 0;
tadeusz.struk@intel.com130ed5d2015-12-15 10:46:17 -08002022 msg.msg_iocb = NULL;
Alexander Potapenko9f138fa2017-03-08 18:08:16 +01002023 msg.msg_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002024 if (sock->file->f_flags & O_NONBLOCK)
2025 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002026 err = sock_recvmsg(sock, &msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002028 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002029 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002030 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002031 if (err2 < 0)
2032 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002034
2035 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08002036out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037 return err;
2038}
2039
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002040SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
2041 unsigned int, flags, struct sockaddr __user *, addr,
2042 int __user *, addr_len)
2043{
2044 return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len);
2045}
2046
Linus Torvalds1da177e2005-04-16 15:20:36 -07002047/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002048 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049 */
2050
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02002051SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
2052 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002053{
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002054 return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002055}
2056
2057/*
2058 * Set a socket option. Because we don't know the option lengths we have
2059 * to pass the user mode parameter for the protocols to sort out.
2060 */
2061
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002062static int __sys_setsockopt(int fd, int level, int optname,
2063 char __user *optval, int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064{
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002065 mm_segment_t oldfs = get_fs();
2066 char *kernel_optval = NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002067 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068 struct socket *sock;
2069
2070 if (optlen < 0)
2071 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002072
2073 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2074 if (sock != NULL) {
2075 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002076 if (err)
2077 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002079 err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level,
2080 &optname, optval, &optlen,
2081 &kernel_optval);
2082
2083 if (err < 0) {
2084 goto out_put;
2085 } else if (err > 0) {
2086 err = 0;
2087 goto out_put;
2088 }
2089
2090 if (kernel_optval) {
2091 set_fs(KERNEL_DS);
2092 optval = (char __user __force *)kernel_optval;
2093 }
2094
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002096 err =
2097 sock_setsockopt(sock, level, optname, optval,
2098 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002100 err =
2101 sock->ops->setsockopt(sock, level, optname, optval,
2102 optlen);
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002103
2104 if (kernel_optval) {
2105 set_fs(oldfs);
2106 kfree(kernel_optval);
2107 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002108out_put:
2109 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110 }
2111 return err;
2112}
2113
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002114SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
2115 char __user *, optval, int, optlen)
2116{
2117 return __sys_setsockopt(fd, level, optname, optval, optlen);
2118}
2119
Linus Torvalds1da177e2005-04-16 15:20:36 -07002120/*
2121 * Get a socket option. Because we don't know the option lengths we have
2122 * to pass a user mode parameter for the protocols to sort out.
2123 */
2124
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002125static int __sys_getsockopt(int fd, int level, int optname,
2126 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002127{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002128 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129 struct socket *sock;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002130 int max_optlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002132 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2133 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002134 err = security_socket_getsockopt(sock, level, optname);
2135 if (err)
2136 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002137
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002138 max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen);
2139
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002141 err =
2142 sock_getsockopt(sock, level, optname, optval,
2143 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002145 err =
2146 sock->ops->getsockopt(sock, level, optname, optval,
2147 optlen);
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002148
2149 err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname,
2150 optval, optlen,
2151 max_optlen, err);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002152out_put:
2153 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002154 }
2155 return err;
2156}
2157
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002158SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
2159 char __user *, optval, int __user *, optlen)
2160{
2161 return __sys_getsockopt(fd, level, optname, optval, optlen);
2162}
2163
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164/*
2165 * Shutdown a socket.
2166 */
2167
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002168int __sys_shutdown(int fd, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002170 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002171 struct socket *sock;
2172
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002173 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2174 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002176 if (!err)
2177 err = sock->ops->shutdown(sock, how);
2178 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179 }
2180 return err;
2181}
2182
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002183SYSCALL_DEFINE2(shutdown, int, fd, int, how)
2184{
2185 return __sys_shutdown(fd, how);
2186}
2187
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002188/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07002189 * fields which are the same type (int / unsigned) on our platforms.
2190 */
2191#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
2192#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
2193#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
2194
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002195struct used_address {
2196 struct sockaddr_storage name;
2197 unsigned int name_len;
2198};
2199
Al Viroda184282015-03-21 19:29:06 -04002200static int copy_msghdr_from_user(struct msghdr *kmsg,
2201 struct user_msghdr __user *umsg,
2202 struct sockaddr __user **save_addr,
2203 struct iovec **iov)
Dan Carpenter1661bf32013-10-03 00:27:20 +03002204{
Al Viroffb07552017-06-27 19:32:04 -04002205 struct user_msghdr msg;
Al Viro08adb7d2014-11-10 20:23:13 -05002206 ssize_t err;
2207
Al Viroffb07552017-06-27 19:32:04 -04002208 if (copy_from_user(&msg, umsg, sizeof(*umsg)))
Dan Carpenter1661bf32013-10-03 00:27:20 +03002209 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00002210
Paolo Abeni864d9662017-07-21 18:49:45 +02002211 kmsg->msg_control = (void __force *)msg.msg_control;
Al Viroffb07552017-06-27 19:32:04 -04002212 kmsg->msg_controllen = msg.msg_controllen;
2213 kmsg->msg_flags = msg.msg_flags;
2214
2215 kmsg->msg_namelen = msg.msg_namelen;
2216 if (!msg.msg_name)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07002217 kmsg->msg_namelen = 0;
2218
Matthew Leachdbb490b2014-03-11 11:58:27 +00002219 if (kmsg->msg_namelen < 0)
2220 return -EINVAL;
2221
Dan Carpenter1661bf32013-10-03 00:27:20 +03002222 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03002223 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05002224
2225 if (save_addr)
Al Viroffb07552017-06-27 19:32:04 -04002226 *save_addr = msg.msg_name;
Al Viro08adb7d2014-11-10 20:23:13 -05002227
Al Viroffb07552017-06-27 19:32:04 -04002228 if (msg.msg_name && kmsg->msg_namelen) {
Al Viro08adb7d2014-11-10 20:23:13 -05002229 if (!save_addr) {
Paolo Abeni864d9662017-07-21 18:49:45 +02002230 err = move_addr_to_kernel(msg.msg_name,
2231 kmsg->msg_namelen,
Al Viro08adb7d2014-11-10 20:23:13 -05002232 kmsg->msg_name);
2233 if (err < 0)
2234 return err;
2235 }
2236 } else {
2237 kmsg->msg_name = NULL;
2238 kmsg->msg_namelen = 0;
2239 }
2240
Al Viroffb07552017-06-27 19:32:04 -04002241 if (msg.msg_iovlen > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05002242 return -EMSGSIZE;
2243
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002244 kmsg->msg_iocb = NULL;
2245
Jens Axboe87e5e6d2019-05-14 16:02:22 -06002246 err = import_iovec(save_addr ? READ : WRITE,
Al Viroffb07552017-06-27 19:32:04 -04002247 msg.msg_iov, msg.msg_iovlen,
Al Viroda184282015-03-21 19:29:06 -04002248 UIO_FASTIOV, iov, &kmsg->msg_iter);
Jens Axboe87e5e6d2019-05-14 16:02:22 -06002249 return err < 0 ? err : 0;
Dan Carpenter1661bf32013-10-03 00:27:20 +03002250}
2251
Al Viro666547f2014-04-06 14:03:05 -04002252static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002253 struct msghdr *msg_sys, unsigned int flags,
Tom Herbert28a94d82016-03-07 14:11:02 -08002254 struct used_address *used_address,
2255 unsigned int allowed_msghdr_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002257 struct compat_msghdr __user *msg_compat =
2258 (struct compat_msghdr __user *)msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002259 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
Alex Williamsonb9d717a2005-09-26 14:28:02 -07002261 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Amit Kushwaha846cc122016-12-08 18:21:53 +05302262 __aligned(sizeof(__kernel_size_t));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002263 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264 unsigned char *ctl_buf = ctl;
Al Virod8725c82014-12-11 00:02:50 -05002265 int ctl_len;
Al Viro08adb7d2014-11-10 20:23:13 -05002266 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002267
Al Viro08adb7d2014-11-10 20:23:13 -05002268 msg_sys->msg_name = &address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269
Al Viro08449322014-11-09 22:33:45 -05002270 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002271 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
Al Viro08449322014-11-09 22:33:45 -05002272 else
Al Viro08adb7d2014-11-10 20:23:13 -05002273 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002274 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04002275 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002276
2277 err = -ENOBUFS;
2278
Anton Blanchard228e5482011-05-02 20:21:35 +00002279 if (msg_sys->msg_controllen > INT_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002280 goto out_freeiov;
Tom Herbert28a94d82016-03-07 14:11:02 -08002281 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
Anton Blanchard228e5482011-05-02 20:21:35 +00002282 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002283 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002284 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00002285 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002286 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002287 if (err)
2288 goto out_freeiov;
Anton Blanchard228e5482011-05-02 20:21:35 +00002289 ctl_buf = msg_sys->msg_control;
2290 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002291 } else if (ctl_len) {
David S. Millerac4340f2017-01-04 13:24:19 -05002292 BUILD_BUG_ON(sizeof(struct cmsghdr) !=
2293 CMSG_ALIGN(sizeof(struct cmsghdr)));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002294 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002295 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002296 if (ctl_buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002297 goto out_freeiov;
2298 }
2299 err = -EFAULT;
2300 /*
Anton Blanchard228e5482011-05-02 20:21:35 +00002301 * Careful! Before this, msg_sys->msg_control contains a user pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002302 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2303 * checking falls down on this.
2304 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00002305 if (copy_from_user(ctl_buf,
Anton Blanchard228e5482011-05-02 20:21:35 +00002306 (void __user __force *)msg_sys->msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002307 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002308 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00002309 msg_sys->msg_control = ctl_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002310 }
Anton Blanchard228e5482011-05-02 20:21:35 +00002311 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002312
2313 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00002314 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002315 /*
2316 * If this is sendmmsg() and current destination address is same as
2317 * previously succeeded address, omit asking LSM's decision.
2318 * used_address->name_len is initialized to UINT_MAX so that the first
2319 * destination address never matches.
2320 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002321 if (used_address && msg_sys->msg_name &&
2322 used_address->name_len == msg_sys->msg_namelen &&
2323 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002324 used_address->name_len)) {
Al Virod8725c82014-12-11 00:02:50 -05002325 err = sock_sendmsg_nosec(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002326 goto out_freectl;
2327 }
Al Virod8725c82014-12-11 00:02:50 -05002328 err = sock_sendmsg(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002329 /*
2330 * If this is sendmmsg() and sending to current destination address was
2331 * successful, remember it.
2332 */
2333 if (used_address && err >= 0) {
2334 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002335 if (msg_sys->msg_name)
2336 memcpy(&used_address->name, msg_sys->msg_name,
2337 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002338 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002339
2340out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002341 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002342 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2343out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04002344 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00002345 return err;
2346}
2347
2348/*
2349 * BSD sendmsg interface
2350 */
Jens Axboe0fa03c62019-04-19 13:34:07 -06002351long __sys_sendmsg_sock(struct socket *sock, struct user_msghdr __user *msg,
2352 unsigned int flags)
2353{
2354 struct msghdr msg_sys;
2355
2356 return ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
2357}
Anton Blanchard228e5482011-05-02 20:21:35 +00002358
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002359long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2360 bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002361{
2362 int fput_needed, err;
2363 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002364 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00002365
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002366 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2367 return -EINVAL;
2368
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002369 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00002370 if (!sock)
2371 goto out;
2372
Tom Herbert28a94d82016-03-07 14:11:02 -08002373 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
Anton Blanchard228e5482011-05-02 20:21:35 +00002374
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002375 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002376out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002377 return err;
2378}
2379
Al Viro666547f2014-04-06 14:03:05 -04002380SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002381{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002382 return __sys_sendmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002383}
2384
Anton Blanchard228e5482011-05-02 20:21:35 +00002385/*
2386 * Linux sendmmsg interface
2387 */
2388
2389int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002390 unsigned int flags, bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002391{
2392 int fput_needed, err, datagrams;
2393 struct socket *sock;
2394 struct mmsghdr __user *entry;
2395 struct compat_mmsghdr __user *compat_entry;
2396 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002397 struct used_address used_address;
Tom Herbertf0922762016-03-07 14:11:03 -08002398 unsigned int oflags = flags;
Anton Blanchard228e5482011-05-02 20:21:35 +00002399
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002400 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2401 return -EINVAL;
2402
Anton Blanchard98382f42011-08-04 14:07:39 +00002403 if (vlen > UIO_MAXIOV)
2404 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002405
2406 datagrams = 0;
2407
2408 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2409 if (!sock)
2410 return err;
2411
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002412 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002413 entry = mmsg;
2414 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002415 err = 0;
Tom Herbertf0922762016-03-07 14:11:03 -08002416 flags |= MSG_BATCH;
Anton Blanchard228e5482011-05-02 20:21:35 +00002417
2418 while (datagrams < vlen) {
Tom Herbertf0922762016-03-07 14:11:03 -08002419 if (datagrams == vlen - 1)
2420 flags = oflags;
2421
Anton Blanchard228e5482011-05-02 20:21:35 +00002422 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002423 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002424 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002425 if (err < 0)
2426 break;
2427 err = __put_user(err, &compat_entry->msg_len);
2428 ++compat_entry;
2429 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002430 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002431 (struct user_msghdr __user *)entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002432 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002433 if (err < 0)
2434 break;
2435 err = put_user(err, &entry->msg_len);
2436 ++entry;
2437 }
2438
2439 if (err)
2440 break;
2441 ++datagrams;
Soheil Hassas Yeganeh30238982016-11-04 15:36:49 -04002442 if (msg_data_left(&msg_sys))
2443 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002444 cond_resched();
Anton Blanchard228e5482011-05-02 20:21:35 +00002445 }
2446
Anton Blanchard228e5482011-05-02 20:21:35 +00002447 fput_light(sock->file, fput_needed);
2448
Anton Blanchard728ffb82011-08-04 14:07:38 +00002449 /* We only return an error if no datagrams were able to be sent */
2450 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002451 return datagrams;
2452
Anton Blanchard228e5482011-05-02 20:21:35 +00002453 return err;
2454}
2455
2456SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2457 unsigned int, vlen, unsigned int, flags)
2458{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002459 return __sys_sendmmsg(fd, mmsg, vlen, flags, true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002460}
2461
Al Viro666547f2014-04-06 14:03:05 -04002462static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
Eric Dumazet95c96172012-04-15 05:58:06 +00002463 struct msghdr *msg_sys, unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002464{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002465 struct compat_msghdr __user *msg_compat =
2466 (struct compat_msghdr __user *)msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002467 struct iovec iovstack[UIO_FASTIOV];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002468 struct iovec *iov = iovstack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002469 unsigned long cmsg_ptr;
Al Viro2da62902015-03-14 21:13:46 -04002470 int len;
Al Viro08adb7d2014-11-10 20:23:13 -05002471 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002472
2473 /* kernel mode address */
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002474 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002475
2476 /* user mode address pointers */
2477 struct sockaddr __user *uaddr;
Al Viro08adb7d2014-11-10 20:23:13 -05002478 int __user *uaddr_len = COMPAT_NAMELEN(msg);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002479
Al Viro08adb7d2014-11-10 20:23:13 -05002480 msg_sys->msg_name = &addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002481
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002482 if (MSG_CMSG_COMPAT & flags)
Al Viro08adb7d2014-11-10 20:23:13 -05002483 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002484 else
Al Viro08adb7d2014-11-10 20:23:13 -05002485 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002486 if (err < 0)
Al Viroda184282015-03-21 19:29:06 -04002487 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002488
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002489 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2490 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002491
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002492 /* We assume all kernel code knows the size of sockaddr_storage */
2493 msg_sys->msg_namelen = 0;
2494
Linus Torvalds1da177e2005-04-16 15:20:36 -07002495 if (sock->file->f_flags & O_NONBLOCK)
2496 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002497 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002498 if (err < 0)
2499 goto out_freeiov;
2500 len = err;
2501
2502 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002503 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002504 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002505 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002506 if (err < 0)
2507 goto out_freeiov;
2508 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002509 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002510 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002511 if (err)
2512 goto out_freeiov;
2513 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002514 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515 &msg_compat->msg_controllen);
2516 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002517 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002518 &msg->msg_controllen);
2519 if (err)
2520 goto out_freeiov;
2521 err = len;
2522
2523out_freeiov:
Al Viroda184282015-03-21 19:29:06 -04002524 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002525 return err;
2526}
2527
2528/*
2529 * BSD recvmsg interface
2530 */
2531
Jens Axboeaa1fa282019-04-19 13:38:09 -06002532long __sys_recvmsg_sock(struct socket *sock, struct user_msghdr __user *msg,
2533 unsigned int flags)
2534{
2535 struct msghdr msg_sys;
2536
2537 return ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2538}
2539
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002540long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2541 bool forbid_cmsg_compat)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002542{
2543 int fput_needed, err;
2544 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002545 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002546
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002547 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2548 return -EINVAL;
2549
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002550 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002551 if (!sock)
2552 goto out;
2553
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002554 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002555
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002556 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002557out:
2558 return err;
2559}
2560
Al Viro666547f2014-04-06 14:03:05 -04002561SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002562 unsigned int, flags)
2563{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002564 return __sys_recvmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002565}
2566
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002567/*
2568 * Linux recvmmsg interface
2569 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002570
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002571static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2572 unsigned int vlen, unsigned int flags,
2573 struct timespec64 *timeout)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002574{
2575 int fput_needed, err, datagrams;
2576 struct socket *sock;
2577 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002578 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002579 struct msghdr msg_sys;
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002580 struct timespec64 end_time;
2581 struct timespec64 timeout64;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002582
2583 if (timeout &&
2584 poll_select_set_timeout(&end_time, timeout->tv_sec,
2585 timeout->tv_nsec))
2586 return -EINVAL;
2587
2588 datagrams = 0;
2589
2590 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2591 if (!sock)
2592 return err;
2593
Soheil Hassas Yeganeh7797dc42018-02-27 18:22:40 -05002594 if (likely(!(flags & MSG_ERRQUEUE))) {
2595 err = sock_error(sock->sk);
2596 if (err) {
2597 datagrams = err;
2598 goto out_put;
2599 }
Maxime Jayate623a9e2017-02-21 18:35:51 +01002600 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002601
2602 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002603 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002604
2605 while (datagrams < vlen) {
2606 /*
2607 * No need to ask LSM for more than the first datagram.
2608 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002609 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002610 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002611 &msg_sys, flags & ~MSG_WAITFORONE,
2612 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002613 if (err < 0)
2614 break;
2615 err = __put_user(err, &compat_entry->msg_len);
2616 ++compat_entry;
2617 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002618 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002619 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002620 &msg_sys, flags & ~MSG_WAITFORONE,
2621 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002622 if (err < 0)
2623 break;
2624 err = put_user(err, &entry->msg_len);
2625 ++entry;
2626 }
2627
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002628 if (err)
2629 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002630 ++datagrams;
2631
Brandon L Black71c5c1592010-03-26 16:18:03 +00002632 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2633 if (flags & MSG_WAITFORONE)
2634 flags |= MSG_DONTWAIT;
2635
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002636 if (timeout) {
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002637 ktime_get_ts64(&timeout64);
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002638 *timeout = timespec64_sub(end_time, timeout64);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002639 if (timeout->tv_sec < 0) {
2640 timeout->tv_sec = timeout->tv_nsec = 0;
2641 break;
2642 }
2643
2644 /* Timeout, return less than vlen datagrams */
2645 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2646 break;
2647 }
2648
2649 /* Out of band data, return right away */
2650 if (msg_sys.msg_flags & MSG_OOB)
2651 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002652 cond_resched();
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002653 }
2654
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002655 if (err == 0)
2656 goto out_put;
2657
2658 if (datagrams == 0) {
2659 datagrams = err;
2660 goto out_put;
2661 }
2662
2663 /*
2664 * We may return less entries than requested (vlen) if the
2665 * sock is non block and there aren't enough datagrams...
2666 */
2667 if (err != -EAGAIN) {
2668 /*
2669 * ... or if recvmsg returns an error after we
2670 * received some datagrams, where we record the
2671 * error to return on the next call or if the
2672 * app asks about it using getsockopt(SO_ERROR).
2673 */
2674 sock->sk->sk_err = -err;
2675 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002676out_put:
2677 fput_light(sock->file, fput_needed);
2678
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002679 return datagrams;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002680}
2681
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002682int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2683 unsigned int vlen, unsigned int flags,
2684 struct __kernel_timespec __user *timeout,
2685 struct old_timespec32 __user *timeout32)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002686{
2687 int datagrams;
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002688 struct timespec64 timeout_sys;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002689
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002690 if (timeout && get_timespec64(&timeout_sys, timeout))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002691 return -EFAULT;
2692
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002693 if (timeout32 && get_old_timespec32(&timeout_sys, timeout32))
2694 return -EFAULT;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002695
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002696 if (!timeout && !timeout32)
2697 return do_recvmmsg(fd, mmsg, vlen, flags, NULL);
2698
2699 datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2700
2701 if (datagrams <= 0)
2702 return datagrams;
2703
2704 if (timeout && put_timespec64(&timeout_sys, timeout))
2705 datagrams = -EFAULT;
2706
2707 if (timeout32 && put_old_timespec32(&timeout_sys, timeout32))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002708 datagrams = -EFAULT;
2709
2710 return datagrams;
2711}
2712
Dominik Brodowski1255e262018-03-13 20:44:21 +01002713SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2714 unsigned int, vlen, unsigned int, flags,
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002715 struct __kernel_timespec __user *, timeout)
Dominik Brodowski1255e262018-03-13 20:44:21 +01002716{
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002717 if (flags & MSG_CMSG_COMPAT)
2718 return -EINVAL;
2719
2720 return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL);
Dominik Brodowski1255e262018-03-13 20:44:21 +01002721}
2722
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002723#ifdef CONFIG_COMPAT_32BIT_TIME
2724SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg,
2725 unsigned int, vlen, unsigned int, flags,
2726 struct old_timespec32 __user *, timeout)
2727{
2728 if (flags & MSG_CMSG_COMPAT)
2729 return -EINVAL;
2730
2731 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout);
2732}
2733#endif
2734
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002735#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002736/* Argument list sizes for sys_socketcall */
2737#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002738static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002739 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2740 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2741 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002742 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002743};
2744
Linus Torvalds1da177e2005-04-16 15:20:36 -07002745#undef AL
2746
2747/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002748 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002749 *
2750 * Argument checking cleaned up. Saved 20% in size.
2751 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002752 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002753 */
2754
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002755SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002756{
Chen Gang2950fa92013-04-07 16:55:23 +08002757 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002758 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002759 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002760 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002761
Anton Blanchard228e5482011-05-02 20:21:35 +00002762 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002763 return -EINVAL;
Jeremy Clinec8e8cd52018-07-27 22:43:01 +00002764 call = array_index_nospec(call, SYS_SENDMMSG + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002765
Arjan van de Ven47379052009-09-28 12:57:44 -07002766 len = nargs[call];
2767 if (len > sizeof(a))
2768 return -EINVAL;
2769
Linus Torvalds1da177e2005-04-16 15:20:36 -07002770 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002771 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002772 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002773
Chen Gang2950fa92013-04-07 16:55:23 +08002774 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2775 if (err)
2776 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002777
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002778 a0 = a[0];
2779 a1 = a[1];
2780
2781 switch (call) {
2782 case SYS_SOCKET:
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01002783 err = __sys_socket(a0, a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002784 break;
2785 case SYS_BIND:
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01002786 err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002787 break;
2788 case SYS_CONNECT:
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01002789 err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002790 break;
2791 case SYS_LISTEN:
Dominik Brodowski25e290e2018-03-13 19:36:54 +01002792 err = __sys_listen(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002793 break;
2794 case SYS_ACCEPT:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002795 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2796 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002797 break;
2798 case SYS_GETSOCKNAME:
2799 err =
Dominik Brodowski8882a102018-03-13 19:43:14 +01002800 __sys_getsockname(a0, (struct sockaddr __user *)a1,
2801 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002802 break;
2803 case SYS_GETPEERNAME:
2804 err =
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01002805 __sys_getpeername(a0, (struct sockaddr __user *)a1,
2806 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002807 break;
2808 case SYS_SOCKETPAIR:
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01002809 err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002810 break;
2811 case SYS_SEND:
Dominik Brodowskif3bf8962018-03-13 19:52:00 +01002812 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2813 NULL, 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002814 break;
2815 case SYS_SENDTO:
Dominik Brodowski211b6342018-03-13 19:18:52 +01002816 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2817 (struct sockaddr __user *)a[4], a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002818 break;
2819 case SYS_RECV:
Dominik Brodowskid27e9af2018-03-13 19:54:17 +01002820 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2821 NULL, NULL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002822 break;
2823 case SYS_RECVFROM:
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002824 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2825 (struct sockaddr __user *)a[4],
2826 (int __user *)a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002827 break;
2828 case SYS_SHUTDOWN:
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002829 err = __sys_shutdown(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002830 break;
2831 case SYS_SETSOCKOPT:
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002832 err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3],
2833 a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002834 break;
2835 case SYS_GETSOCKOPT:
2836 err =
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002837 __sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2838 (int __user *)a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002839 break;
2840 case SYS_SENDMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002841 err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1,
2842 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002843 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002844 case SYS_SENDMMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002845 err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2],
2846 a[3], true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002847 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002848 case SYS_RECVMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002849 err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1,
2850 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002851 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002852 case SYS_RECVMMSG:
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002853 if (IS_ENABLED(CONFIG_64BIT) || !IS_ENABLED(CONFIG_64BIT_TIME))
2854 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
2855 a[2], a[3],
2856 (struct __kernel_timespec __user *)a[4],
2857 NULL);
2858 else
2859 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
2860 a[2], a[3], NULL,
2861 (struct old_timespec32 __user *)a[4]);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002862 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002863 case SYS_ACCEPT4:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002864 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2865 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002866 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002867 default:
2868 err = -EINVAL;
2869 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002870 }
2871 return err;
2872}
2873
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002874#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002875
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002876/**
2877 * sock_register - add a socket protocol handler
2878 * @ops: description of protocol
2879 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002880 * This function is called by a protocol handler that wants to
2881 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09002882 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002883 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002884 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002885int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002886{
2887 int err;
2888
2889 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08002890 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002891 return -ENOBUFS;
2892 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002893
2894 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002895 if (rcu_dereference_protected(net_families[ops->family],
2896 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002897 err = -EEXIST;
2898 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00002899 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002900 err = 0;
2901 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002902 spin_unlock(&net_family_lock);
2903
Yang Yingliang3410f222014-02-12 17:09:55 +08002904 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002905 return err;
2906}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002907EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002908
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002909/**
2910 * sock_unregister - remove a protocol handler
2911 * @family: protocol family to remove
2912 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002913 * This function is called by a protocol handler that wants to
2914 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002915 * new socket creation.
2916 *
2917 * If protocol handler is a module, then it can use module reference
2918 * counts to protect against new references. If protocol handler is not
2919 * a module then it needs to provide its own protection in
2920 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002921 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002922void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002923{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002924 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002925
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002926 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00002927 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002928 spin_unlock(&net_family_lock);
2929
2930 synchronize_rcu();
2931
Yang Yingliang3410f222014-02-12 17:09:55 +08002932 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002933}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002934EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002935
Xin Longbf2ae2e2018-03-10 18:57:50 +08002936bool sock_is_registered(int family)
2937{
Jeremy Cline66b51b02018-08-13 22:23:13 +00002938 return family < NPROTO && rcu_access_pointer(net_families[family]);
Xin Longbf2ae2e2018-03-10 18:57:50 +08002939}
2940
Andi Kleen77d76ea2005-12-22 12:43:42 -08002941static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002942{
Nick Pigginb3e19d92011-01-07 17:50:11 +11002943 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00002944 /*
2945 * Initialize the network sysctl infrastructure.
2946 */
2947 err = net_sysctl_init();
2948 if (err)
2949 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11002950
Linus Torvalds1da177e2005-04-16 15:20:36 -07002951 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002952 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07002953 */
2954 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955
2956 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002957 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002958 */
2959
2960 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11002961
2962 err = register_filesystem(&sock_fs_type);
2963 if (err)
2964 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002965 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11002966 if (IS_ERR(sock_mnt)) {
2967 err = PTR_ERR(sock_mnt);
2968 goto out_mount;
2969 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08002970
2971 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002972 */
2973
2974#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00002975 err = netfilter_init();
2976 if (err)
2977 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002978#endif
David S. Millercbeb3212005-12-22 12:58:55 -08002979
Daniel Borkmann408eccc2014-04-01 16:20:23 +02002980 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00002981
Nick Pigginb3e19d92011-01-07 17:50:11 +11002982out:
2983 return err;
2984
2985out_mount:
2986 unregister_filesystem(&sock_fs_type);
2987out_fs:
2988 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002989}
2990
Andi Kleen77d76ea2005-12-22 12:43:42 -08002991core_initcall(sock_init); /* early initcall */
2992
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993#ifdef CONFIG_PROC_FS
2994void socket_seq_show(struct seq_file *seq)
2995{
Tonghao Zhang648845a2017-12-14 05:51:58 -08002996 seq_printf(seq, "sockets: used %d\n",
2997 sock_inuse_get(seq->private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002998}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002999#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003000
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003001#ifdef CONFIG_COMPAT
Al Viro36fd6332017-06-26 13:19:16 -04003002static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003003{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003004 struct compat_ifconf ifc32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003005 struct ifconf ifc;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003006 int err;
3007
Arnd Bergmann6b960182009-11-06 23:10:54 -08003008 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003009 return -EFAULT;
3010
Al Viro36fd6332017-06-26 13:19:16 -04003011 ifc.ifc_len = ifc32.ifc_len;
3012 ifc.ifc_req = compat_ptr(ifc32.ifcbuf);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003013
Al Viro36fd6332017-06-26 13:19:16 -04003014 rtnl_lock();
3015 err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq));
3016 rtnl_unlock();
Arnd Bergmann7a229382009-11-06 23:00:29 -08003017 if (err)
3018 return err;
3019
Al Viro36fd6332017-06-26 13:19:16 -04003020 ifc32.ifc_len = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08003021 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003022 return -EFAULT;
3023
3024 return 0;
3025}
3026
Arnd Bergmann6b960182009-11-06 23:10:54 -08003027static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003028{
Ben Hutchings3a7da392011-03-17 07:34:32 +00003029 struct compat_ethtool_rxnfc __user *compat_rxnfc;
3030 bool convert_in = false, convert_out = false;
Al Viro44c02a22017-10-05 12:59:44 -04003031 size_t buf_size = 0;
3032 struct ethtool_rxnfc __user *rxnfc = NULL;
3033 struct ifreq ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00003034 u32 rule_cnt = 0, actual_rule_cnt;
3035 u32 ethcmd;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003036 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00003037 int ret;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003038
3039 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
3040 return -EFAULT;
3041
Ben Hutchings3a7da392011-03-17 07:34:32 +00003042 compat_rxnfc = compat_ptr(data);
3043
3044 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003045 return -EFAULT;
3046
Ben Hutchings3a7da392011-03-17 07:34:32 +00003047 /* Most ethtool structures are defined without padding.
3048 * Unfortunately struct ethtool_rxnfc is an exception.
3049 */
3050 switch (ethcmd) {
3051 default:
3052 break;
3053 case ETHTOOL_GRXCLSRLALL:
3054 /* Buffer size is variable */
3055 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
3056 return -EFAULT;
3057 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
3058 return -ENOMEM;
3059 buf_size += rule_cnt * sizeof(u32);
3060 /* fall through */
3061 case ETHTOOL_GRXRINGS:
3062 case ETHTOOL_GRXCLSRLCNT:
3063 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00003064 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00003065 convert_out = true;
3066 /* fall through */
3067 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00003068 buf_size += sizeof(struct ethtool_rxnfc);
3069 convert_in = true;
Al Viro44c02a22017-10-05 12:59:44 -04003070 rxnfc = compat_alloc_user_space(buf_size);
Ben Hutchings3a7da392011-03-17 07:34:32 +00003071 break;
3072 }
3073
Al Viro44c02a22017-10-05 12:59:44 -04003074 if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ))
Ben Hutchings3a7da392011-03-17 07:34:32 +00003075 return -EFAULT;
3076
Al Viro44c02a22017-10-05 12:59:44 -04003077 ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc;
Ben Hutchings3a7da392011-03-17 07:34:32 +00003078
3079 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00003080 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00003081 * fs.ring_cookie and at the end of fs, but nowhere else.
3082 */
Alexander Duyck127fe532011-04-08 18:01:59 +00003083 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
3084 sizeof(compat_rxnfc->fs.m_ext) !=
3085 offsetof(struct ethtool_rxnfc, fs.m_ext) +
3086 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00003087 BUILD_BUG_ON(
3088 offsetof(struct compat_ethtool_rxnfc, fs.location) -
3089 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
3090 offsetof(struct ethtool_rxnfc, fs.location) -
3091 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
3092
3093 if (copy_in_user(rxnfc, compat_rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00003094 (void __user *)(&rxnfc->fs.m_ext + 1) -
3095 (void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00003096 copy_in_user(&rxnfc->fs.ring_cookie,
3097 &compat_rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00003098 (void __user *)(&rxnfc->fs.location + 1) -
Wenwen Wangb6168562018-10-18 09:36:46 -05003099 (void __user *)&rxnfc->fs.ring_cookie))
3100 return -EFAULT;
3101 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
3102 if (put_user(rule_cnt, &rxnfc->rule_cnt))
3103 return -EFAULT;
3104 } else if (copy_in_user(&rxnfc->rule_cnt,
3105 &compat_rxnfc->rule_cnt,
3106 sizeof(rxnfc->rule_cnt)))
Ben Hutchings3a7da392011-03-17 07:34:32 +00003107 return -EFAULT;
3108 }
3109
Al Viro44c02a22017-10-05 12:59:44 -04003110 ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL);
Ben Hutchings3a7da392011-03-17 07:34:32 +00003111 if (ret)
3112 return ret;
3113
3114 if (convert_out) {
3115 if (copy_in_user(compat_rxnfc, rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00003116 (const void __user *)(&rxnfc->fs.m_ext + 1) -
3117 (const void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00003118 copy_in_user(&compat_rxnfc->fs.ring_cookie,
3119 &rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00003120 (const void __user *)(&rxnfc->fs.location + 1) -
3121 (const void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00003122 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
3123 sizeof(rxnfc->rule_cnt)))
3124 return -EFAULT;
3125
3126 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
3127 /* As an optimisation, we only copy the actual
3128 * number of rules that the underlying
3129 * function returned. Since Mallory might
3130 * change the rule count in user memory, we
3131 * check that it is less than the rule count
3132 * originally given (as the user buffer size),
3133 * which has been range-checked.
3134 */
3135 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
3136 return -EFAULT;
3137 if (actual_rule_cnt < rule_cnt)
3138 rule_cnt = actual_rule_cnt;
3139 if (copy_in_user(&compat_rxnfc->rule_locs[0],
3140 &rxnfc->rule_locs[0],
3141 rule_cnt * sizeof(u32)))
3142 return -EFAULT;
3143 }
3144 }
3145
3146 return 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003147}
3148
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003149static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
3150{
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003151 compat_uptr_t uptr32;
Al Viro44c02a22017-10-05 12:59:44 -04003152 struct ifreq ifr;
3153 void __user *saved;
3154 int err;
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003155
Al Viro44c02a22017-10-05 12:59:44 -04003156 if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003157 return -EFAULT;
3158
3159 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
3160 return -EFAULT;
3161
Al Viro44c02a22017-10-05 12:59:44 -04003162 saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc;
3163 ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003164
Al Viro44c02a22017-10-05 12:59:44 -04003165 err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL);
3166 if (!err) {
3167 ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved;
3168 if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq)))
3169 err = -EFAULT;
Joe Perchesccbd6a52010-05-14 10:58:26 +00003170 }
Al Viro44c02a22017-10-05 12:59:44 -04003171 return err;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003172}
3173
Ben Hutchings590d4692013-11-18 17:04:13 +00003174/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3175static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08003176 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003177{
Al Viro44c02a22017-10-05 12:59:44 -04003178 struct ifreq ifreq;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003179 u32 data32;
3180
Al Viro44c02a22017-10-05 12:59:44 -04003181 if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003182 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04003183 if (get_user(data32, &u_ifreq32->ifr_data))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003184 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04003185 ifreq.ifr_data = compat_ptr(data32);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003186
Al Viro44c02a22017-10-05 12:59:44 -04003187 return dev_ioctl(net, cmd, &ifreq, NULL);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003188}
3189
Johannes Berg37ac39b2019-01-25 22:43:18 +01003190static int compat_ifreq_ioctl(struct net *net, struct socket *sock,
3191 unsigned int cmd,
3192 struct compat_ifreq __user *uifr32)
3193{
3194 struct ifreq __user *uifr;
3195 int err;
3196
3197 /* Handle the fact that while struct ifreq has the same *layout* on
3198 * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
3199 * which are handled elsewhere, it still has different *size* due to
3200 * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
3201 * resulting in struct ifreq being 32 and 40 bytes respectively).
3202 * As a result, if the struct happens to be at the end of a page and
3203 * the next page isn't readable/writable, we get a fault. To prevent
3204 * that, copy back and forth to the full size.
3205 */
3206
3207 uifr = compat_alloc_user_space(sizeof(*uifr));
3208 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
3209 return -EFAULT;
3210
3211 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
3212
3213 if (!err) {
3214 switch (cmd) {
3215 case SIOCGIFFLAGS:
3216 case SIOCGIFMETRIC:
3217 case SIOCGIFMTU:
3218 case SIOCGIFMEM:
3219 case SIOCGIFHWADDR:
3220 case SIOCGIFINDEX:
3221 case SIOCGIFADDR:
3222 case SIOCGIFBRDADDR:
3223 case SIOCGIFDSTADDR:
3224 case SIOCGIFNETMASK:
3225 case SIOCGIFPFLAGS:
3226 case SIOCGIFTXQLEN:
3227 case SIOCGMIIPHY:
3228 case SIOCGMIIREG:
Johannes Bergc6c9fee2019-01-25 22:43:19 +01003229 case SIOCGIFNAME:
Johannes Berg37ac39b2019-01-25 22:43:18 +01003230 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
3231 err = -EFAULT;
3232 break;
3233 }
3234 }
3235 return err;
3236}
3237
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003238static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
3239 struct compat_ifreq __user *uifr32)
3240{
3241 struct ifreq ifr;
3242 struct compat_ifmap __user *uifmap32;
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003243 int err;
3244
3245 uifmap32 = &uifr32->ifr_ifru.ifru_map;
3246 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003247 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3248 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3249 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3250 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
3251 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
3252 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003253 if (err)
3254 return -EFAULT;
3255
Al Viro44c02a22017-10-05 12:59:44 -04003256 err = dev_ioctl(net, cmd, &ifr, NULL);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003257
3258 if (cmd == SIOCGIFMAP && !err) {
3259 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003260 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3261 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3262 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3263 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
3264 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
3265 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003266 if (err)
3267 err = -EFAULT;
3268 }
3269 return err;
3270}
3271
Arnd Bergmann7a229382009-11-06 23:00:29 -08003272struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003273 u32 rt_pad1;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003274 struct sockaddr rt_dst; /* target address */
3275 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3276 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003277 unsigned short rt_flags;
3278 short rt_pad2;
3279 u32 rt_pad3;
3280 unsigned char rt_tos;
3281 unsigned char rt_class;
3282 short rt_pad4;
3283 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003284 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003285 u32 rt_mtu; /* per route MTU/Window */
3286 u32 rt_window; /* Window clamping */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003287 unsigned short rt_irtt; /* Initial RTT */
3288};
3289
3290struct in6_rtmsg32 {
3291 struct in6_addr rtmsg_dst;
3292 struct in6_addr rtmsg_src;
3293 struct in6_addr rtmsg_gateway;
3294 u32 rtmsg_type;
3295 u16 rtmsg_dst_len;
3296 u16 rtmsg_src_len;
3297 u32 rtmsg_metric;
3298 u32 rtmsg_info;
3299 u32 rtmsg_flags;
3300 s32 rtmsg_ifindex;
3301};
3302
Arnd Bergmann6b960182009-11-06 23:10:54 -08003303static int routing_ioctl(struct net *net, struct socket *sock,
3304 unsigned int cmd, void __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003305{
3306 int ret;
3307 void *r = NULL;
3308 struct in6_rtmsg r6;
3309 struct rtentry r4;
3310 char devname[16];
3311 u32 rtdev;
3312 mm_segment_t old_fs = get_fs();
3313
Arnd Bergmann6b960182009-11-06 23:10:54 -08003314 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3315 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003316 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003317 3 * sizeof(struct in6_addr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003318 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3319 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3320 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3321 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3322 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3323 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3324 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003325
3326 r = (void *) &r6;
3327 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003328 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003329 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003330 3 * sizeof(struct sockaddr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003331 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3332 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3333 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3334 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3335 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3336 ret |= get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003337 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003338 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003339 r4.rt_dev = (char __user __force *)devname;
3340 devname[15] = 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003341 } else
3342 r4.rt_dev = NULL;
3343
3344 r = (void *) &r4;
3345 }
3346
3347 if (ret) {
3348 ret = -EFAULT;
3349 goto out;
3350 }
3351
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003352 set_fs(KERNEL_DS);
Johannes Berg63ff03a2019-01-25 22:43:17 +01003353 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003354 set_fs(old_fs);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003355
3356out:
Arnd Bergmann7a229382009-11-06 23:00:29 -08003357 return ret;
3358}
3359
3360/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3361 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003362 * use compatible ioctls
Arnd Bergmann7a229382009-11-06 23:00:29 -08003363 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003364static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003365{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003366 compat_ulong_t tmp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003367
Arnd Bergmann6b960182009-11-06 23:10:54 -08003368 if (get_user(tmp, argp))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003369 return -EFAULT;
3370 if (tmp == BRCTL_GET_VERSION)
3371 return BRCTL_VERSION + 1;
3372 return -EINVAL;
3373}
3374
Arnd Bergmann6b960182009-11-06 23:10:54 -08003375static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3376 unsigned int cmd, unsigned long arg)
3377{
3378 void __user *argp = compat_ptr(arg);
3379 struct sock *sk = sock->sk;
3380 struct net *net = sock_net(sk);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003381
Arnd Bergmann6b960182009-11-06 23:10:54 -08003382 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003383 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003384
Arnd Bergmann6b960182009-11-06 23:10:54 -08003385 switch (cmd) {
3386 case SIOCSIFBR:
3387 case SIOCGIFBR:
3388 return old_bridge_ioctl(argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003389 case SIOCGIFCONF:
Al Viro36fd6332017-06-26 13:19:16 -04003390 return compat_dev_ifconf(net, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003391 case SIOCETHTOOL:
3392 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003393 case SIOCWANDEV:
3394 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003395 case SIOCGIFMAP:
3396 case SIOCSIFMAP:
3397 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003398 case SIOCADDRT:
3399 case SIOCDELRT:
3400 return routing_ioctl(net, sock, cmd, argp);
Arnd Bergmann0768e172019-04-17 22:56:11 +02003401 case SIOCGSTAMP_OLD:
3402 case SIOCGSTAMPNS_OLD:
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02003403 if (!sock->ops->gettstamp)
3404 return -ENOIOCTLCMD;
Arnd Bergmann0768e172019-04-17 22:56:11 +02003405 return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD,
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02003406 !COMPAT_USE_64BIT_TIME);
3407
Ben Hutchings590d4692013-11-18 17:04:13 +00003408 case SIOCBONDSLAVEINFOQUERY:
3409 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003410 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003411 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003412 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003413
Arnd Bergmann6b960182009-11-06 23:10:54 -08003414 case FIOSETOWN:
3415 case SIOCSPGRP:
3416 case FIOGETOWN:
3417 case SIOCGPGRP:
3418 case SIOCBRADDBR:
3419 case SIOCBRDELBR:
3420 case SIOCGIFVLAN:
3421 case SIOCSIFVLAN:
3422 case SIOCADDDLCI:
3423 case SIOCDELDLCI:
Andrey Vaginc62cce22016-10-24 18:29:13 -07003424 case SIOCGSKNS:
Arnd Bergmann0768e172019-04-17 22:56:11 +02003425 case SIOCGSTAMP_NEW:
3426 case SIOCGSTAMPNS_NEW:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003427 return sock_ioctl(file, cmd, arg);
3428
3429 case SIOCGIFFLAGS:
3430 case SIOCSIFFLAGS:
3431 case SIOCGIFMETRIC:
3432 case SIOCSIFMETRIC:
3433 case SIOCGIFMTU:
3434 case SIOCSIFMTU:
3435 case SIOCGIFMEM:
3436 case SIOCSIFMEM:
3437 case SIOCGIFHWADDR:
3438 case SIOCSIFHWADDR:
3439 case SIOCADDMULTI:
3440 case SIOCDELMULTI:
3441 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003442 case SIOCGIFADDR:
3443 case SIOCSIFADDR:
3444 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003445 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003446 case SIOCGIFBRDADDR:
3447 case SIOCSIFBRDADDR:
3448 case SIOCGIFDSTADDR:
3449 case SIOCSIFDSTADDR:
3450 case SIOCGIFNETMASK:
3451 case SIOCSIFNETMASK:
3452 case SIOCSIFPFLAGS:
3453 case SIOCGIFPFLAGS:
3454 case SIOCGIFTXQLEN:
3455 case SIOCSIFTXQLEN:
3456 case SIOCBRADDIF:
3457 case SIOCBRDELIF:
Johannes Bergc6c9fee2019-01-25 22:43:19 +01003458 case SIOCGIFNAME:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003459 case SIOCSIFNAME:
3460 case SIOCGMIIPHY:
3461 case SIOCGMIIREG:
3462 case SIOCSMIIREG:
Al Virof92d4fc2017-09-30 19:32:17 -04003463 case SIOCBONDENSLAVE:
3464 case SIOCBONDRELEASE:
3465 case SIOCBONDSETHWADDR:
3466 case SIOCBONDCHANGEACTIVE:
Johannes Berg37ac39b2019-01-25 22:43:18 +01003467 return compat_ifreq_ioctl(net, sock, cmd, argp);
3468
Arnd Bergmann6b960182009-11-06 23:10:54 -08003469 case SIOCSARP:
3470 case SIOCGARP:
3471 case SIOCDARP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003472 case SIOCATMARK:
Johannes Berg63ff03a2019-01-25 22:43:17 +01003473 return sock_do_ioctl(net, sock, cmd, arg);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003474 }
3475
Arnd Bergmann6b960182009-11-06 23:10:54 -08003476 return -ENOIOCTLCMD;
3477}
Arnd Bergmann7a229382009-11-06 23:00:29 -08003478
Eric Dumazet95c96172012-04-15 05:58:06 +00003479static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003480 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003481{
3482 struct socket *sock = file->private_data;
3483 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003484 struct sock *sk;
3485 struct net *net;
3486
3487 sk = sock->sk;
3488 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003489
3490 if (sock->ops->compat_ioctl)
3491 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3492
David S. Miller87de87d2008-06-03 09:14:03 -07003493 if (ret == -ENOIOCTLCMD &&
3494 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3495 ret = compat_wext_handle_ioctl(net, cmd, arg);
3496
Arnd Bergmann6b960182009-11-06 23:10:54 -08003497 if (ret == -ENOIOCTLCMD)
3498 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3499
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003500 return ret;
3501}
3502#endif
3503
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003504/**
3505 * kernel_bind - bind an address to a socket (kernel space)
3506 * @sock: socket
3507 * @addr: address
3508 * @addrlen: length of address
3509 *
3510 * Returns 0 or an error.
3511 */
3512
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003513int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3514{
3515 return sock->ops->bind(sock, addr, addrlen);
3516}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003517EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003518
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003519/**
3520 * kernel_listen - move socket to listening state (kernel space)
3521 * @sock: socket
3522 * @backlog: pending connections queue size
3523 *
3524 * Returns 0 or an error.
3525 */
3526
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003527int kernel_listen(struct socket *sock, int backlog)
3528{
3529 return sock->ops->listen(sock, backlog);
3530}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003531EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003532
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003533/**
3534 * kernel_accept - accept a connection (kernel space)
3535 * @sock: listening socket
3536 * @newsock: new connected socket
3537 * @flags: flags
3538 *
3539 * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0.
3540 * If it fails, @newsock is guaranteed to be %NULL.
3541 * Returns 0 or an error.
3542 */
3543
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003544int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3545{
3546 struct sock *sk = sock->sk;
3547 int err;
3548
3549 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3550 newsock);
3551 if (err < 0)
3552 goto done;
3553
David Howellscdfbabf2017-03-09 08:09:05 +00003554 err = sock->ops->accept(sock, *newsock, flags, true);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003555 if (err < 0) {
3556 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003557 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003558 goto done;
3559 }
3560
3561 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003562 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003563
3564done:
3565 return err;
3566}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003567EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003568
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003569/**
3570 * kernel_connect - connect a socket (kernel space)
3571 * @sock: socket
3572 * @addr: address
3573 * @addrlen: address length
3574 * @flags: flags (O_NONBLOCK, ...)
3575 *
3576 * For datagram sockets, @addr is the addres to which datagrams are sent
3577 * by default, and the only address from which datagrams are received.
3578 * For stream sockets, attempts to connect to @addr.
3579 * Returns 0 or an error code.
3580 */
3581
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003582int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003583 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003584{
3585 return sock->ops->connect(sock, addr, addrlen, flags);
3586}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003587EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003588
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003589/**
3590 * kernel_getsockname - get the address which the socket is bound (kernel space)
3591 * @sock: socket
3592 * @addr: address holder
3593 *
3594 * Fills the @addr pointer with the address which the socket is bound.
3595 * Returns 0 or an error code.
3596 */
3597
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003598int kernel_getsockname(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003599{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003600 return sock->ops->getname(sock, addr, 0);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003601}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003602EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003603
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003604/**
3605 * kernel_peername - get the address which the socket is connected (kernel space)
3606 * @sock: socket
3607 * @addr: address holder
3608 *
3609 * Fills the @addr pointer with the address which the socket is connected.
3610 * Returns 0 or an error code.
3611 */
3612
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003613int kernel_getpeername(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003614{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003615 return sock->ops->getname(sock, addr, 1);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003616}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003617EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003618
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003619/**
3620 * kernel_getsockopt - get a socket option (kernel space)
3621 * @sock: socket
3622 * @level: API level (SOL_SOCKET, ...)
3623 * @optname: option tag
3624 * @optval: option value
3625 * @optlen: option length
3626 *
3627 * Assigns the option length to @optlen.
3628 * Returns 0 or an error.
3629 */
3630
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003631int kernel_getsockopt(struct socket *sock, int level, int optname,
3632 char *optval, int *optlen)
3633{
3634 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003635 char __user *uoptval;
3636 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003637 int err;
3638
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003639 uoptval = (char __user __force *) optval;
3640 uoptlen = (int __user __force *) optlen;
3641
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003642 set_fs(KERNEL_DS);
3643 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003644 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003645 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003646 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3647 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003648 set_fs(oldfs);
3649 return err;
3650}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003651EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003652
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003653/**
3654 * kernel_setsockopt - set a socket option (kernel space)
3655 * @sock: socket
3656 * @level: API level (SOL_SOCKET, ...)
3657 * @optname: option tag
3658 * @optval: option value
3659 * @optlen: option length
3660 *
3661 * Returns 0 or an error.
3662 */
3663
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003664int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003665 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003666{
3667 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003668 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003669 int err;
3670
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003671 uoptval = (char __user __force *) optval;
3672
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003673 set_fs(KERNEL_DS);
3674 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003675 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003676 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003677 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003678 optlen);
3679 set_fs(oldfs);
3680 return err;
3681}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003682EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003683
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003684/**
3685 * kernel_sendpage - send a &page through a socket (kernel space)
3686 * @sock: socket
3687 * @page: page
3688 * @offset: page offset
3689 * @size: total size in bytes
3690 * @flags: flags (MSG_DONTWAIT, ...)
3691 *
3692 * Returns the total amount sent in bytes or an error.
3693 */
3694
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003695int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3696 size_t size, int flags)
3697{
3698 if (sock->ops->sendpage)
3699 return sock->ops->sendpage(sock, page, offset, size, flags);
3700
3701 return sock_no_sendpage(sock, page, offset, size, flags);
3702}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003703EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003704
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003705/**
3706 * kernel_sendpage_locked - send a &page through the locked sock (kernel space)
3707 * @sk: sock
3708 * @page: page
3709 * @offset: page offset
3710 * @size: total size in bytes
3711 * @flags: flags (MSG_DONTWAIT, ...)
3712 *
3713 * Returns the total amount sent in bytes or an error.
3714 * Caller must hold @sk.
3715 */
3716
Tom Herbert306b13e2017-07-28 16:22:41 -07003717int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
3718 size_t size, int flags)
3719{
3720 struct socket *sock = sk->sk_socket;
3721
3722 if (sock->ops->sendpage_locked)
3723 return sock->ops->sendpage_locked(sk, page, offset, size,
3724 flags);
3725
3726 return sock_no_sendpage_locked(sk, page, offset, size, flags);
3727}
3728EXPORT_SYMBOL(kernel_sendpage_locked);
3729
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003730/**
3731 * kernel_shutdown - shut down part of a full-duplex connection (kernel space)
3732 * @sock: socket
3733 * @how: connection part
3734 *
3735 * Returns 0 or an error.
3736 */
3737
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003738int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3739{
3740 return sock->ops->shutdown(sock, how);
3741}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003742EXPORT_SYMBOL(kernel_sock_shutdown);
R. Parameswaran113c3072017-04-05 16:50:35 -07003743
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003744/**
3745 * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
3746 * @sk: socket
3747 *
3748 * This routine returns the IP overhead imposed by a socket i.e.
3749 * the length of the underlying IP header, depending on whether
3750 * this is an IPv4 or IPv6 socket and the length from IP options turned
3751 * on at the socket. Assumes that the caller has a lock on the socket.
R. Parameswaran113c3072017-04-05 16:50:35 -07003752 */
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003753
R. Parameswaran113c3072017-04-05 16:50:35 -07003754u32 kernel_sock_ip_overhead(struct sock *sk)
3755{
3756 struct inet_sock *inet;
3757 struct ip_options_rcu *opt;
3758 u32 overhead = 0;
R. Parameswaran113c3072017-04-05 16:50:35 -07003759#if IS_ENABLED(CONFIG_IPV6)
3760 struct ipv6_pinfo *np;
3761 struct ipv6_txoptions *optv6 = NULL;
3762#endif /* IS_ENABLED(CONFIG_IPV6) */
3763
3764 if (!sk)
3765 return overhead;
3766
R. Parameswaran113c3072017-04-05 16:50:35 -07003767 switch (sk->sk_family) {
3768 case AF_INET:
3769 inet = inet_sk(sk);
3770 overhead += sizeof(struct iphdr);
3771 opt = rcu_dereference_protected(inet->inet_opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003772 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003773 if (opt)
3774 overhead += opt->opt.optlen;
3775 return overhead;
3776#if IS_ENABLED(CONFIG_IPV6)
3777 case AF_INET6:
3778 np = inet6_sk(sk);
3779 overhead += sizeof(struct ipv6hdr);
3780 if (np)
3781 optv6 = rcu_dereference_protected(np->opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003782 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003783 if (optv6)
3784 overhead += (optv6->opt_flen + optv6->opt_nflen);
3785 return overhead;
3786#endif /* IS_ENABLED(CONFIG_IPV6) */
3787 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
3788 return overhead;
3789 }
3790}
3791EXPORT_SYMBOL(kernel_sock_ip_overhead);