blob: 70ede74ab24b01ffba2dea0f3b4953eaded6a4b3 [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 Bergmannc7dc5042019-06-03 23:07:12 +0200103#include <linux/termios.h>
Arnd Bergmann6b960182009-11-06 23:10:54 -0800104#include <linux/sockios.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +0300105#include <net/busy_poll.h>
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400106#include <linux/errqueue.h>
Eliezer Tamir06021292013-06-10 11:39:50 +0300107
Cong Wange0d10952013-08-01 11:10:25 +0800108#ifdef CONFIG_NET_RX_BUSY_POLL
Eliezer Tamir64b0dc52013-07-10 17:13:36 +0300109unsigned int sysctl_net_busy_read __read_mostly;
110unsigned int sysctl_net_busy_poll __read_mostly;
Eliezer Tamir06021292013-06-10 11:39:50 +0300111#endif
Arnd Bergmann6b960182009-11-06 23:10:54 -0800112
Al Viro8ae5e0302014-11-28 19:40:50 -0500113static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to);
114static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700115static int sock_mmap(struct file *file, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117static int sock_close(struct inode *inode, struct file *file);
Linus Torvaldsa11e1d42018-06-28 09:43:44 -0700118static __poll_t sock_poll(struct file *file,
119 struct poll_table_struct *wait);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700120static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800121#ifdef CONFIG_COMPAT
122static long compat_sock_ioctl(struct file *file,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700123 unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800124#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125static int sock_fasync(int fd, struct file *filp, int on);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126static ssize_t sock_sendpage(struct file *file, struct page *page,
127 int offset, size_t size, loff_t *ppos, int more);
Jens Axboe9c55e012007-11-06 23:30:13 -0800128static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700129 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800130 unsigned int flags);
Arnd Bergmann542d3062020-01-08 22:44:43 +0100131
132#ifdef CONFIG_PROC_FS
133static void sock_show_fdinfo(struct seq_file *m, struct file *f)
134{
135 struct socket *sock = f->private_data;
136
137 if (sock->ops->show_fdinfo)
138 sock->ops->show_fdinfo(m, sock);
139}
140#else
141#define sock_show_fdinfo NULL
142#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144/*
145 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
146 * in the operation structures but are done directly via the socketcall() multiplexor.
147 */
148
Arjan van de Venda7071d2007-02-12 00:55:36 -0800149static const struct file_operations socket_file_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 .owner = THIS_MODULE,
151 .llseek = no_llseek,
Al Viro8ae5e0302014-11-28 19:40:50 -0500152 .read_iter = sock_read_iter,
153 .write_iter = sock_write_iter,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 .poll = sock_poll,
155 .unlocked_ioctl = sock_ioctl,
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800156#ifdef CONFIG_COMPAT
157 .compat_ioctl = compat_sock_ioctl,
158#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 .mmap = sock_mmap,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 .release = sock_close,
161 .fasync = sock_fasync,
Jens Axboe5274f052006-03-30 15:15:30 +0200162 .sendpage = sock_sendpage,
163 .splice_write = generic_splice_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800164 .splice_read = sock_splice_read,
Kirill Tkhaib4653342019-12-09 13:03:40 +0300165 .show_fdinfo = sock_show_fdinfo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166};
167
168/*
169 * The protocol list. Each protocol is registered in here.
170 */
171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172static DEFINE_SPINLOCK(net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +0000173static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700176 * Support routines.
177 * Move socket addresses back and forth across the kernel/user
178 * divide and look after the messy bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 */
180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181/**
182 * move_addr_to_kernel - copy a socket address into kernel space
183 * @uaddr: Address in user space
184 * @kaddr: Address in kernel space
185 * @ulen: Length in user space
186 *
187 * The address is copied into kernel space. If the provided address is
188 * too long an error code of -EINVAL is returned. If the copy gives
189 * invalid addresses -EFAULT is returned. On a success 0 is returned.
190 */
191
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000192int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700194 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700196 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700198 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100200 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
202
203/**
204 * move_addr_to_user - copy an address to user space
205 * @kaddr: kernel space address
206 * @klen: length of address in kernel
207 * @uaddr: user space address
208 * @ulen: pointer to user length field
209 *
210 * The value pointed to by ulen on entry is the buffer length available.
211 * This is overwritten with the buffer space used. -EINVAL is returned
212 * if an overlong buffer is specified or a negative buffer size. -EFAULT
213 * is returned if either the buffer or the length field are not
214 * accessible.
215 * After copying the data up to the limit the user specifies, the true
216 * length of the data is written over the length limit the user
217 * specified. Zero is returned for a success.
218 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700219
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000220static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
stephen hemminger11165f12010-10-18 14:27:29 +0000221 void __user *uaddr, int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
223 int err;
224 int len;
225
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100226 BUG_ON(klen > sizeof(struct sockaddr_storage));
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700227 err = get_user(len, ulen);
228 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700230 if (len > klen)
231 len = klen;
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100232 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700234 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500235 if (audit_sockaddr(klen, kaddr))
236 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700237 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 return -EFAULT;
239 }
240 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700241 * "fromlen shall refer to the value before truncation.."
242 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 */
244 return __put_user(klen, ulen);
245}
246
Alexey Dobriyan08009a72018-02-24 21:20:33 +0300247static struct kmem_cache *sock_inode_cachep __ro_after_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249static struct inode *sock_alloc_inode(struct super_block *sb)
250{
251 struct socket_alloc *ei;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700252
Christoph Lametere94b1762006-12-06 20:33:17 -0800253 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 if (!ei)
255 return NULL;
Al Viro333f7902019-07-05 20:14:16 +0100256 init_waitqueue_head(&ei->socket.wq.wait);
257 ei->socket.wq.fasync_list = NULL;
258 ei->socket.wq.flags = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700259
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 ei->socket.state = SS_UNCONNECTED;
261 ei->socket.flags = 0;
262 ei->socket.ops = NULL;
263 ei->socket.sk = NULL;
264 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266 return &ei->vfs_inode;
267}
268
Al Viro6d7855c2019-07-05 20:13:22 +0100269static void sock_free_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270{
Eric Dumazet43815482010-04-29 11:01:49 +0000271 struct socket_alloc *ei;
272
273 ei = container_of(inode, struct socket_alloc, vfs_inode);
Eric Dumazet43815482010-04-29 11:01:49 +0000274 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275}
276
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700277static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700279 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Christoph Lametera35afb82007-05-16 22:10:57 -0700281 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700283
yuan linyu1e911632017-01-07 17:18:31 +0800284static void init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285{
286 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700287 sizeof(struct socket_alloc),
288 0,
289 (SLAB_HWCACHE_ALIGN |
290 SLAB_RECLAIM_ACCOUNT |
Vladimir Davydov5d097052016-01-14 15:18:21 -0800291 SLAB_MEM_SPREAD | SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +0900292 init_once);
yuan linyu1e911632017-01-07 17:18:31 +0800293 BUG_ON(sock_inode_cachep == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294}
295
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700296static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700297 .alloc_inode = sock_alloc_inode,
Al Viro6d7855c2019-07-05 20:13:22 +0100298 .free_inode = sock_free_inode,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700299 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300};
301
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700302/*
303 * sockfs_dname() is called from d_path().
304 */
305static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
306{
307 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
David Howellsc5ef6032015-03-17 22:26:16 +0000308 d_inode(dentry)->i_ino);
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700309}
310
Al Viro3ba13d12009-02-20 06:02:22 +0000311static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700312 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313};
314
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200315static int sockfs_xattr_get(const struct xattr_handler *handler,
316 struct dentry *dentry, struct inode *inode,
317 const char *suffix, void *value, size_t size)
318{
319 if (value) {
320 if (dentry->d_name.len + 1 > size)
321 return -ERANGE;
322 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
323 }
324 return dentry->d_name.len + 1;
325}
326
327#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
328#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
329#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
330
331static const struct xattr_handler sockfs_xattr_handler = {
332 .name = XATTR_NAME_SOCKPROTONAME,
333 .get = sockfs_xattr_get,
334};
335
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100336static int sockfs_security_xattr_set(const struct xattr_handler *handler,
337 struct dentry *dentry, struct inode *inode,
338 const char *suffix, const void *value,
339 size_t size, int flags)
340{
341 /* Handled by LSM. */
342 return -EAGAIN;
343}
344
345static const struct xattr_handler sockfs_security_xattr_handler = {
346 .prefix = XATTR_SECURITY_PREFIX,
347 .set = sockfs_security_xattr_set,
348};
349
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200350static const struct xattr_handler *sockfs_xattr_handlers[] = {
351 &sockfs_xattr_handler,
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100352 &sockfs_security_xattr_handler,
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200353 NULL
354};
355
David Howellsfba9be42019-03-25 16:38:24 +0000356static int sockfs_init_fs_context(struct fs_context *fc)
Al Viroc74a1cb2011-01-12 16:59:34 -0500357{
David Howellsfba9be42019-03-25 16:38:24 +0000358 struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC);
359 if (!ctx)
360 return -ENOMEM;
361 ctx->ops = &sockfs_ops;
362 ctx->dops = &sockfs_dentry_operations;
363 ctx->xattr = sockfs_xattr_handlers;
364 return 0;
Al Viroc74a1cb2011-01-12 16:59:34 -0500365}
366
367static struct vfsmount *sock_mnt __read_mostly;
368
369static struct file_system_type sock_fs_type = {
370 .name = "sockfs",
David Howellsfba9be42019-03-25 16:38:24 +0000371 .init_fs_context = sockfs_init_fs_context,
Al Viroc74a1cb2011-01-12 16:59:34 -0500372 .kill_sb = kill_anon_super,
373};
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375/*
376 * Obtains the first available file descriptor and sets it up for use.
377 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800378 * These functions create file structures and maps them to fd space
379 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 * and file struct implicitly stored in sock->file.
381 * Note that another thread may close file descriptor before we return
382 * from this function. We use the fact that now we do not refer
383 * to socket after mapping. If one day we will need it, this
384 * function will increment ref. count on file by 1.
385 *
386 * In any case returned fd MAY BE not valid!
387 * This race condition is unavoidable
388 * with shared fd spaces, we cannot solve it inside kernel,
389 * but we take care of internal coherence yet.
390 */
391
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300392/**
393 * sock_alloc_file - Bind a &socket to a &file
394 * @sock: socket
395 * @flags: file status flags
396 * @dname: protocol name
397 *
398 * Returns the &file bound with @sock, implicitly storing it
399 * in sock->file. If dname is %NULL, sets to "".
400 * On failure the return is a ERR pointer (see linux/err.h).
401 * This function uses GFP_KERNEL internally.
402 */
403
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700404struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405{
Al Viro7cbe66b2009-08-05 19:59:08 +0400406 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800407
Al Virod93aa9d2018-06-09 09:40:05 -0400408 if (!dname)
409 dname = sock->sk ? sock->sk->sk_prot_creator->name : "";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Al Virod93aa9d2018-06-09 09:40:05 -0400411 file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname,
412 O_RDWR | (flags & O_NONBLOCK),
413 &socket_file_ops);
Viresh Kumarb5ffe632015-08-12 15:59:47 +0530414 if (IS_ERR(file)) {
Al Viro8e1611e2017-12-05 23:29:09 +0000415 sock_release(sock);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700416 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400417 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800418
419 sock->file = file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800420 file->private_data = sock;
Linus Torvaldsd8e464e2019-11-17 11:20:48 -0800421 stream_open(SOCK_INODE(sock), file);
Al Viro28407632012-08-17 23:54:15 -0400422 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800423}
Al Viro56b31d12012-08-18 00:25:51 -0400424EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800425
Al Viro56b31d12012-08-18 00:25:51 -0400426static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800427{
428 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400429 int fd = get_unused_fd_flags(flags);
Al Viroce4bb042018-01-10 18:47:05 -0500430 if (unlikely(fd < 0)) {
431 sock_release(sock);
Al Viro28407632012-08-17 23:54:15 -0400432 return fd;
Al Viroce4bb042018-01-10 18:47:05 -0500433 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800434
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700435 newfile = sock_alloc_file(sock, flags, NULL);
Enrico Weigelt4546e442019-06-05 22:58:50 +0200436 if (!IS_ERR(newfile)) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800437 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400438 return fd;
439 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400440
Al Viro28407632012-08-17 23:54:15 -0400441 put_unused_fd(fd);
442 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443}
444
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300445/**
446 * sock_from_file - Return the &socket bounded to @file.
447 * @file: file
448 * @err: pointer to an error code return
449 *
450 * On failure returns %NULL and assigns -ENOTSOCK to @err.
451 */
452
John Fastabend406a3c62012-07-20 10:39:25 +0000453struct socket *sock_from_file(struct file *file, int *err)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800454{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800455 if (file->f_op == &socket_file_ops)
456 return file->private_data; /* set in sock_map_fd */
457
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800458 *err = -ENOTSOCK;
459 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800460}
John Fastabend406a3c62012-07-20 10:39:25 +0000461EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800462
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700464 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 * @fd: file handle
466 * @err: pointer to an error code return
467 *
468 * The file handle passed in is locked and the socket it is bound
Rosen, Rami241c4662017-05-21 22:12:38 +0300469 * to is returned. If an error occurs the err pointer is overwritten
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 * with a negative errno code and NULL is returned. The function checks
471 * for both invalid handles and passing a handle which is not a socket.
472 *
473 * On a success the socket object pointer is returned.
474 */
475
476struct socket *sockfd_lookup(int fd, int *err)
477{
478 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 struct socket *sock;
480
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700481 file = fget(fd);
482 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 *err = -EBADF;
484 return NULL;
485 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700486
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800487 sock = sock_from_file(file, err);
488 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 return sock;
491}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700492EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800494static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
495{
Al Viro00e188e2014-03-03 23:48:18 -0500496 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800497 struct socket *sock;
498
Hua Zhong36725582006-04-19 15:25:02 -0700499 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500500 if (f.file) {
501 sock = sock_from_file(f.file, err);
502 if (likely(sock)) {
503 *fput_needed = f.flags;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800504 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500505 }
506 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800507 }
508 return NULL;
509}
510
Masatake YAMATO600e1772012-08-29 10:44:29 +0000511static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
512 size_t size)
513{
514 ssize_t len;
515 ssize_t used = 0;
516
David Howellsc5ef6032015-03-17 22:26:16 +0000517 len = security_inode_listsecurity(d_inode(dentry), buffer, size);
Masatake YAMATO600e1772012-08-29 10:44:29 +0000518 if (len < 0)
519 return len;
520 used += len;
521 if (buffer) {
522 if (size < used)
523 return -ERANGE;
524 buffer += len;
525 }
526
527 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
528 used += len;
529 if (buffer) {
530 if (size < used)
531 return -ERANGE;
532 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
533 buffer += len;
534 }
535
536 return used;
537}
538
Tobias Klauserdc647ec2017-01-10 09:30:51 +0100539static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr)
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900540{
541 int err = simple_setattr(dentry, iattr);
542
Eric Biggerse1a3a602016-12-30 17:42:32 -0600543 if (!err && (iattr->ia_valid & ATTR_UID)) {
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900544 struct socket *sock = SOCKET_I(d_inode(dentry));
545
Cong Wang6d8c50d2018-06-07 13:39:49 -0700546 if (sock->sk)
547 sock->sk->sk_uid = iattr->ia_uid;
548 else
549 err = -ENOENT;
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900550 }
551
552 return err;
553}
554
Masatake YAMATO600e1772012-08-29 10:44:29 +0000555static const struct inode_operations sockfs_inode_ops = {
Masatake YAMATO600e1772012-08-29 10:44:29 +0000556 .listxattr = sockfs_listxattr,
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900557 .setattr = sockfs_setattr,
Masatake YAMATO600e1772012-08-29 10:44:29 +0000558};
559
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300561 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700562 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 * Allocate a new inode and socket object. The two are bound together
564 * and initialised. The socket is then returned. If we are out of inodes
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300565 * NULL is returned. This functions uses GFP_KERNEL internally.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 */
567
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800568struct socket *sock_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700570 struct inode *inode;
571 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200573 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 if (!inode)
575 return NULL;
576
577 sock = SOCKET_I(inode);
578
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400579 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700580 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100581 inode->i_uid = current_fsuid();
582 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000583 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 return sock;
586}
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800587EXPORT_SYMBOL(sock_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300590 * sock_release - close a socket
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 * @sock: socket to close
592 *
593 * The socket is released from the protocol stack if it has a release
594 * callback, and the inode is then released if the socket is bound to
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700595 * an inode not a file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700597
Cong Wang6d8c50d2018-06-07 13:39:49 -0700598static void __sock_release(struct socket *sock, struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599{
600 if (sock->ops) {
601 struct module *owner = sock->ops->owner;
602
Cong Wang6d8c50d2018-06-07 13:39:49 -0700603 if (inode)
604 inode_lock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 sock->ops->release(sock);
Eric Biggersff7b11a2019-02-21 14:13:56 -0800606 sock->sk = NULL;
Cong Wang6d8c50d2018-06-07 13:39:49 -0700607 if (inode)
608 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 sock->ops = NULL;
610 module_put(owner);
611 }
612
Al Viro333f7902019-07-05 20:14:16 +0100613 if (sock->wq.fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800614 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 if (!sock->file) {
617 iput(SOCK_INODE(sock));
618 return;
619 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700620 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621}
Cong Wang6d8c50d2018-06-07 13:39:49 -0700622
623void sock_release(struct socket *sock)
624{
625 __sock_release(sock, NULL);
626}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700627EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400629void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000630{
Eric Dumazet140c55d2014-08-06 11:49:29 +0200631 u8 flags = *tx_flags;
632
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400633 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200634 flags |= SKBTX_HW_TSTAMP;
635
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400636 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200637 flags |= SKBTX_SW_TSTAMP;
638
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400639 if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200640 flags |= SKBTX_SCHED_TSTAMP;
641
Eric Dumazet140c55d2014-08-06 11:49:29 +0200642 *tx_flags = flags;
Patrick Ohly20d49472009-02-12 05:03:38 +0000643}
Willem de Bruijn67cc0d42014-09-08 19:58:58 -0400644EXPORT_SYMBOL(__sock_tx_timestamp);
Patrick Ohly20d49472009-02-12 05:03:38 +0000645
Paolo Abeni8c3c4472019-05-03 17:01:39 +0200646INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *,
647 size_t));
Paolo Abenia648a592019-07-03 16:06:54 +0200648INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *,
649 size_t));
Al Virod8725c82014-12-11 00:02:50 -0500650static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651{
Paolo Abenia648a592019-07-03 16:06:54 +0200652 int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg,
653 inet_sendmsg, sock, msg,
654 msg_data_left(msg));
Al Virod8725c82014-12-11 00:02:50 -0500655 BUG_ON(ret == -EIOCBQUEUED);
656 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657}
Gu Zheng0cf00c62014-12-05 15:14:23 +0800658
Randy Dunlap85806af2019-05-18 21:23:07 -0700659/**
660 * sock_sendmsg - send a message through @sock
661 * @sock: socket
662 * @msg: message to send
663 *
664 * Sends @msg through @sock, passing through LSM.
665 * Returns the number of bytes sent, or an error code.
666 */
Al Virod8725c82014-12-11 00:02:50 -0500667int sock_sendmsg(struct socket *sock, struct msghdr *msg)
Gu Zheng0cf00c62014-12-05 15:14:23 +0800668{
Al Virod8725c82014-12-11 00:02:50 -0500669 int err = security_socket_sendmsg(sock, msg,
Al Viro01e97e62014-12-15 21:39:31 -0500670 msg_data_left(msg));
Ying Xue1b784142015-03-02 15:37:48 +0800671
Al Virod8725c82014-12-11 00:02:50 -0500672 return err ?: sock_sendmsg_nosec(sock, msg);
Gu Zheng0cf00c62014-12-05 15:14:23 +0800673}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700674EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300676/**
677 * kernel_sendmsg - send a message through @sock (kernel-space)
678 * @sock: socket
679 * @msg: message header
680 * @vec: kernel vec
681 * @num: vec array length
682 * @size: total message data size
683 *
684 * Builds the message data with @vec and sends it through @sock.
685 * Returns the number of bytes sent, or an error code.
686 */
687
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
689 struct kvec *vec, size_t num, size_t size)
690{
David Howellsaa563d72018-10-20 00:57:56 +0100691 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Al Virod8725c82014-12-11 00:02:50 -0500692 return sock_sendmsg(sock, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700694EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300696/**
697 * kernel_sendmsg_locked - send a message through @sock (kernel-space)
698 * @sk: sock
699 * @msg: message header
700 * @vec: output s/g array
701 * @num: output s/g array length
702 * @size: total message data size
703 *
704 * Builds the message data with @vec and sends it through @sock.
705 * Returns the number of bytes sent, or an error code.
706 * Caller must hold @sk.
707 */
708
Tom Herbert306b13e2017-07-28 16:22:41 -0700709int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
710 struct kvec *vec, size_t num, size_t size)
711{
712 struct socket *sock = sk->sk_socket;
713
714 if (!sock->ops->sendmsg_locked)
John Fastabenddb5980d2017-08-15 22:31:34 -0700715 return sock_no_sendmsg_locked(sk, msg, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700716
David Howellsaa563d72018-10-20 00:57:56 +0100717 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700718
719 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
720}
721EXPORT_SYMBOL(kernel_sendmsg_locked);
722
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400723static bool skb_is_err_queue(const struct sk_buff *skb)
724{
725 /* pkt_type of skbs enqueued on the error queue are set to
726 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
727 * in recvmsg, since skbs received on a local socket will never
728 * have a pkt_type of PACKET_OUTGOING.
729 */
730 return skb->pkt_type == PACKET_OUTGOING;
731}
732
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200733/* On transmit, software and hardware timestamps are returned independently.
734 * As the two skb clones share the hardware timestamp, which may be updated
735 * before the software timestamp is received, a hardware TX timestamp may be
736 * returned only if there is no software TX timestamp. Ignore false software
737 * timestamps, which may be made in the __sock_recv_timestamp() call when the
Deepa Dinamani7f1bc6e2019-02-02 07:34:46 -0800738 * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200739 * hardware timestamp.
740 */
741static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
742{
743 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb);
744}
745
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200746static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb)
747{
748 struct scm_ts_pktinfo ts_pktinfo;
749 struct net_device *orig_dev;
750
751 if (!skb_mac_header_was_set(skb))
752 return;
753
754 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo));
755
756 rcu_read_lock();
757 orig_dev = dev_get_by_napi_id(skb_napi_id(skb));
758 if (orig_dev)
759 ts_pktinfo.if_index = orig_dev->ifindex;
760 rcu_read_unlock();
761
762 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb);
763 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
764 sizeof(ts_pktinfo), &ts_pktinfo);
765}
766
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700767/*
768 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
769 */
770void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
771 struct sk_buff *skb)
772{
Patrick Ohly20d49472009-02-12 05:03:38 +0000773 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Deepa Dinamani887feae2019-02-02 07:34:50 -0800774 int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW);
Deepa Dinamani97184752019-02-02 07:34:51 -0800775 struct scm_timestamping_internal tss;
776
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200777 int empty = 1, false_tstamp = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000778 struct skb_shared_hwtstamps *shhwtstamps =
779 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700780
Patrick Ohly20d49472009-02-12 05:03:38 +0000781 /* Race occurred between timestamp enabling and packet
782 receiving. Fill in the current time for now. */
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200783 if (need_software_tstamp && skb->tstamp == 0) {
Patrick Ohly20d49472009-02-12 05:03:38 +0000784 __net_timestamp(skb);
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200785 false_tstamp = 1;
786 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000787
788 if (need_software_tstamp) {
789 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800790 if (new_tstamp) {
791 struct __kernel_sock_timeval tv;
792
793 skb_get_new_timestamp(skb, &tv);
794 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
795 sizeof(tv), &tv);
796 } else {
797 struct __kernel_old_timeval tv;
798
799 skb_get_timestamp(skb, &tv);
800 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
801 sizeof(tv), &tv);
802 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000803 } else {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800804 if (new_tstamp) {
805 struct __kernel_timespec ts;
806
807 skb_get_new_timestampns(skb, &ts);
808 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
809 sizeof(ts), &ts);
810 } else {
Arnd Bergmanndf1b4ba2019-10-25 22:04:46 +0200811 struct __kernel_old_timespec ts;
Deepa Dinamani887feae2019-02-02 07:34:50 -0800812
813 skb_get_timestampns(skb, &ts);
814 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
815 sizeof(ts), &ts);
816 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000817 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700818 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000819
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400820 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400821 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Deepa Dinamani97184752019-02-02 07:34:51 -0800822 ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000823 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400824 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400825 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200826 !skb_is_swtx_tstamp(skb, false_tstamp) &&
Deepa Dinamani97184752019-02-02 07:34:51 -0800827 ktime_to_timespec64_cond(shhwtstamps->hwtstamp, tss.ts + 2)) {
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400828 empty = 0;
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200829 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&
830 !skb_is_err_queue(skb))
831 put_ts_pktinfo(msg, skb);
832 }
Francis Yan1c885802016-11-27 23:07:18 -0800833 if (!empty) {
Deepa Dinamani97184752019-02-02 07:34:51 -0800834 if (sock_flag(sk, SOCK_TSTAMP_NEW))
835 put_cmsg_scm_timestamping64(msg, &tss);
836 else
837 put_cmsg_scm_timestamping(msg, &tss);
Francis Yan1c885802016-11-27 23:07:18 -0800838
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400839 if (skb_is_err_queue(skb) && skb->len &&
Soheil Hassas Yeganeh4ef1b282017-03-18 17:03:00 -0400840 SKB_EXT_ERR(skb)->opt_stats)
Francis Yan1c885802016-11-27 23:07:18 -0800841 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
842 skb->len, skb->data);
843 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700844}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300845EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
846
Johannes Berg6e3e9392011-11-09 10:15:42 +0100847void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
848 struct sk_buff *skb)
849{
850 int ack;
851
852 if (!sock_flag(sk, SOCK_WIFI_STATUS))
853 return;
854 if (!skb->wifi_acked_valid)
855 return;
856
857 ack = skb->wifi_acked;
858
859 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
860}
861EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
862
stephen hemminger11165f12010-10-18 14:27:29 +0000863static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
864 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700865{
Eyal Birger744d5a32015-03-01 14:58:31 +0200866 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
Neil Horman3b885782009-10-12 13:26:31 -0700867 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
Eyal Birger744d5a32015-03-01 14:58:31 +0200868 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
Neil Horman3b885782009-10-12 13:26:31 -0700869}
870
Eric Dumazet767dd032010-04-28 19:14:43 +0000871void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700872 struct sk_buff *skb)
873{
874 sock_recv_timestamp(msg, sk, skb);
875 sock_recv_drops(msg, sk, skb);
876}
Eric Dumazet767dd032010-04-28 19:14:43 +0000877EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700878
Paolo Abeni8c3c4472019-05-03 17:01:39 +0200879INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *,
Paolo Abenia648a592019-07-03 16:06:54 +0200880 size_t, int));
881INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *,
882 size_t, int));
Ying Xue1b784142015-03-02 15:37:48 +0800883static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
Al Viro2da62902015-03-14 21:13:46 -0400884 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885{
Paolo Abenia648a592019-07-03 16:06:54 +0200886 return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg,
887 inet_recvmsg, sock, msg, msg_data_left(msg),
888 flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889}
890
Randy Dunlap85806af2019-05-18 21:23:07 -0700891/**
892 * sock_recvmsg - receive a message from @sock
893 * @sock: socket
894 * @msg: message to receive
895 * @flags: message flags
896 *
897 * Receives @msg from @sock, passing through LSM. Returns the total number
898 * of bytes received, or an error.
899 */
Al Viro2da62902015-03-14 21:13:46 -0400900int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700901{
Al Viro2da62902015-03-14 21:13:46 -0400902 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700903
Al Viro2da62902015-03-14 21:13:46 -0400904 return err ?: sock_recvmsg_nosec(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700906EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000908/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300909 * kernel_recvmsg - Receive a message from a socket (kernel space)
910 * @sock: The socket to receive the message from
911 * @msg: Received message
912 * @vec: Input s/g array for message data
913 * @num: Size of input s/g array
914 * @size: Number of bytes to read
915 * @flags: Message flags (MSG_DONTWAIT, etc...)
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000916 *
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300917 * On return the msg structure contains the scatter/gather array passed in the
918 * vec argument. The array is modified so that it consists of the unfilled
919 * portion of the original array.
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000920 *
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300921 * The returned value is the total number of bytes received, or an error.
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000922 */
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300923
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700924int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
925 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926{
927 mm_segment_t oldfs = get_fs();
928 int result;
929
David Howellsaa563d72018-10-20 00:57:56 +0100930 iov_iter_kvec(&msg->msg_iter, READ, vec, num, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 set_fs(KERNEL_DS);
Al Viro2da62902015-03-14 21:13:46 -0400932 result = sock_recvmsg(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 set_fs(oldfs);
934 return result;
935}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700936EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300938static ssize_t sock_sendpage(struct file *file, struct page *page,
939 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940{
941 struct socket *sock;
942 int flags;
943
Eric Dumazetb69aee02005-09-06 14:42:45 -0700944 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
Eric Dumazet35f9c092012-04-05 03:05:35 +0000946 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
947 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
948 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949
Linus Torvaldse6949582009-08-13 08:28:36 -0700950 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951}
952
Jens Axboe9c55e012007-11-06 23:30:13 -0800953static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700954 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800955 unsigned int flags)
956{
957 struct socket *sock = file->private_data;
958
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800959 if (unlikely(!sock->ops->splice_read))
Slavomir Kaslev95506582018-11-16 11:27:53 +0200960 return generic_file_splice_read(file, ppos, pipe, len, flags);
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800961
Jens Axboe9c55e012007-11-06 23:30:13 -0800962 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
963}
964
Al Viro8ae5e0302014-11-28 19:40:50 -0500965static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800966{
Al Viro6d652332015-01-30 16:12:56 -0500967 struct file *file = iocb->ki_filp;
968 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700969 struct msghdr msg = {.msg_iter = *to,
970 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -0500971 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800972
Jens Axboeebfcd892019-12-09 20:58:56 -0700973 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
Al Viro8ae5e0302014-11-28 19:40:50 -0500974 msg.msg_flags = MSG_DONTWAIT;
975
976 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800977 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700978
Christoph Hellwig66ee59a2015-02-11 19:56:46 +0100979 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800980 return 0;
981
Al Viro2da62902015-03-14 21:13:46 -0400982 res = sock_recvmsg(sock, &msg, msg.msg_flags);
Al Viro8ae5e0302014-11-28 19:40:50 -0500983 *to = msg.msg_iter;
984 return res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800985}
986
Al Viro8ae5e0302014-11-28 19:40:50 -0500987static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988{
Al Viro6d652332015-01-30 16:12:56 -0500989 struct file *file = iocb->ki_filp;
990 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700991 struct msghdr msg = {.msg_iter = *from,
992 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -0500993 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800994
Al Viro8ae5e0302014-11-28 19:40:50 -0500995 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800996 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700997
Jens Axboeebfcd892019-12-09 20:58:56 -0700998 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
Al Viro8ae5e0302014-11-28 19:40:50 -0500999 msg.msg_flags = MSG_DONTWAIT;
1000
Al Viro6d652332015-01-30 16:12:56 -05001001 if (sock->type == SOCK_SEQPACKET)
1002 msg.msg_flags |= MSG_EOR;
1003
Al Virod8725c82014-12-11 00:02:50 -05001004 res = sock_sendmsg(sock, &msg);
Al Viro8ae5e0302014-11-28 19:40:50 -05001005 *from = msg.msg_iter;
1006 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007}
1008
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009/*
1010 * Atomic setting of ioctl hooks to avoid race
1011 * with module unload.
1012 */
1013
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001014static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001015static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016
Eric W. Biederman881d9662007-09-17 11:56:21 -07001017void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001019 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001021 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022}
1023EXPORT_SYMBOL(brioctl_set);
1024
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001025static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -07001026static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027
Eric W. Biederman881d9662007-09-17 11:56:21 -07001028void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001030 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001032 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033}
1034EXPORT_SYMBOL(vlan_ioctl_set);
1035
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001036static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001037static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001039void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001041 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001043 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044}
1045EXPORT_SYMBOL(dlci_ioctl_set);
1046
Arnd Bergmann6b960182009-11-06 23:10:54 -08001047static long sock_do_ioctl(struct net *net, struct socket *sock,
Johannes Berg63ff03a2019-01-25 22:43:17 +01001048 unsigned int cmd, unsigned long arg)
Arnd Bergmann6b960182009-11-06 23:10:54 -08001049{
1050 int err;
1051 void __user *argp = (void __user *)arg;
1052
1053 err = sock->ops->ioctl(sock, cmd, arg);
1054
1055 /*
1056 * If this ioctl is unknown try to hand it down
1057 * to the NIC driver.
1058 */
Al Viro36fd6332017-06-26 13:19:16 -04001059 if (err != -ENOIOCTLCMD)
1060 return err;
Arnd Bergmann6b960182009-11-06 23:10:54 -08001061
Al Viro36fd6332017-06-26 13:19:16 -04001062 if (cmd == SIOCGIFCONF) {
1063 struct ifconf ifc;
1064 if (copy_from_user(&ifc, argp, sizeof(struct ifconf)))
1065 return -EFAULT;
1066 rtnl_lock();
1067 err = dev_ifconf(net, &ifc, sizeof(struct ifreq));
1068 rtnl_unlock();
1069 if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf)))
1070 err = -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04001071 } else {
1072 struct ifreq ifr;
1073 bool need_copyout;
Johannes Berg63ff03a2019-01-25 22:43:17 +01001074 if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
Al Viro44c02a22017-10-05 12:59:44 -04001075 return -EFAULT;
1076 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
1077 if (!err && need_copyout)
Johannes Berg63ff03a2019-01-25 22:43:17 +01001078 if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
Al Viro44c02a22017-10-05 12:59:44 -04001079 return -EFAULT;
Al Viro36fd6332017-06-26 13:19:16 -04001080 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08001081 return err;
1082}
1083
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084/*
1085 * With an ioctl, arg may well be a user mode pointer, but we don't know
1086 * what to do with it - that's up to the protocol still.
1087 */
1088
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001089/**
1090 * get_net_ns - increment the refcount of the network namespace
1091 * @ns: common namespace (net)
1092 *
1093 * Returns the net's common namespace.
1094 */
1095
Kirill Tkhaid8d211a2018-02-14 16:39:56 +03001096struct ns_common *get_net_ns(struct ns_common *ns)
Andrey Vaginc62cce22016-10-24 18:29:13 -07001097{
1098 return &get_net(container_of(ns, struct net, ns))->ns;
1099}
Kirill Tkhaid8d211a2018-02-14 16:39:56 +03001100EXPORT_SYMBOL_GPL(get_net_ns);
Andrey Vaginc62cce22016-10-24 18:29:13 -07001101
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1103{
1104 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001105 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 void __user *argp = (void __user *)arg;
1107 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001108 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109
Eric Dumazetb69aee02005-09-06 14:42:45 -07001110 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001111 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001112 net = sock_net(sk);
Al Viro44c02a22017-10-05 12:59:44 -04001113 if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
1114 struct ifreq ifr;
1115 bool need_copyout;
1116 if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
1117 return -EFAULT;
1118 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
1119 if (!err && need_copyout)
1120 if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
1121 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001123#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Al Virob1b0c242017-10-01 20:13:08 -04001125 err = wext_handle_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001127#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001128 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 case FIOSETOWN:
1130 case SIOCSPGRP:
1131 err = -EFAULT;
1132 if (get_user(pid, (int __user *)argp))
1133 break;
Jiri Slaby393cc3f2017-06-13 13:35:50 +02001134 err = f_setown(sock->file, pid, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 break;
1136 case FIOGETOWN:
1137 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001138 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001139 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 break;
1141 case SIOCGIFBR:
1142 case SIOCSIFBR:
1143 case SIOCBRADDBR:
1144 case SIOCBRDELBR:
1145 err = -ENOPKG;
1146 if (!br_ioctl_hook)
1147 request_module("bridge");
1148
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001149 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001150 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001151 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001152 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 break;
1154 case SIOCGIFVLAN:
1155 case SIOCSIFVLAN:
1156 err = -ENOPKG;
1157 if (!vlan_ioctl_hook)
1158 request_module("8021q");
1159
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001160 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001162 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001163 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 case SIOCADDDLCI:
1166 case SIOCDELDLCI:
1167 err = -ENOPKG;
1168 if (!dlci_ioctl_hook)
1169 request_module("dlci");
1170
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001171 mutex_lock(&dlci_ioctl_mutex);
1172 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001174 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 break;
Andrey Vaginc62cce22016-10-24 18:29:13 -07001176 case SIOCGSKNS:
1177 err = -EPERM;
1178 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1179 break;
1180
1181 err = open_related_ns(&net->ns, get_net_ns);
1182 break;
Arnd Bergmann0768e172019-04-17 22:56:11 +02001183 case SIOCGSTAMP_OLD:
1184 case SIOCGSTAMPNS_OLD:
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02001185 if (!sock->ops->gettstamp) {
1186 err = -ENOIOCTLCMD;
1187 break;
1188 }
1189 err = sock->ops->gettstamp(sock, argp,
Arnd Bergmann0768e172019-04-17 22:56:11 +02001190 cmd == SIOCGSTAMP_OLD,
1191 !IS_ENABLED(CONFIG_64BIT));
Gustavo A. R. Silva60747822019-04-24 10:31:24 -05001192 break;
Arnd Bergmann0768e172019-04-17 22:56:11 +02001193 case SIOCGSTAMP_NEW:
1194 case SIOCGSTAMPNS_NEW:
1195 if (!sock->ops->gettstamp) {
1196 err = -ENOIOCTLCMD;
1197 break;
1198 }
1199 err = sock->ops->gettstamp(sock, argp,
1200 cmd == SIOCGSTAMP_NEW,
1201 false);
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02001202 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 default:
Johannes Berg63ff03a2019-01-25 22:43:17 +01001204 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001206 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 return err;
1208}
1209
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001210/**
1211 * sock_create_lite - creates a socket
1212 * @family: protocol family (AF_INET, ...)
1213 * @type: communication type (SOCK_STREAM, ...)
1214 * @protocol: protocol (0, ...)
1215 * @res: new socket
1216 *
1217 * Creates a new socket and assigns it to @res, passing through LSM.
1218 * The new socket initialization is not complete, see kernel_accept().
1219 * Returns 0 or an error. On failure @res is set to %NULL.
1220 * This function internally uses GFP_KERNEL.
1221 */
1222
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223int sock_create_lite(int family, int type, int protocol, struct socket **res)
1224{
1225 int err;
1226 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001227
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 err = security_socket_create(family, type, protocol, 1);
1229 if (err)
1230 goto out;
1231
1232 sock = sock_alloc();
1233 if (!sock) {
1234 err = -ENOMEM;
1235 goto out;
1236 }
1237
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001239 err = security_socket_post_create(sock, family, type, protocol, 1);
1240 if (err)
1241 goto out_release;
1242
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243out:
1244 *res = sock;
1245 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001246out_release:
1247 sock_release(sock);
1248 sock = NULL;
1249 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001251EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252
1253/* No kernel lock held - perfect */
Al Viroade994f2017-07-03 00:01:49 -04001254static __poll_t sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255{
Christoph Hellwig3cafb372018-01-09 16:07:34 +01001256 struct socket *sock = file->private_data;
Christoph Hellwiga331de32018-07-30 09:42:13 +02001257 __poll_t events = poll_requested_events(wait), flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258
Christoph Hellwige88958e2018-06-29 15:37:24 +02001259 if (!sock->ops->poll)
1260 return 0;
Christoph Hellwigf641f13b2018-07-30 09:42:12 +02001261
Christoph Hellwiga331de32018-07-30 09:42:13 +02001262 if (sk_can_busy_loop(sock->sk)) {
1263 /* poll once if requested by the syscall */
1264 if (events & POLL_BUSY_LOOP)
1265 sk_busy_loop(sock->sk, 1);
1266
1267 /* if this socket can poll_ll, tell the system call */
1268 flag = POLL_BUSY_LOOP;
1269 }
1270
1271 return sock->ops->poll(file, sock, wait) | flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272}
1273
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001274static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001276 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277
1278 return sock->ops->mmap(file, sock, vma);
1279}
1280
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001281static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282{
Cong Wang6d8c50d2018-06-07 13:39:49 -07001283 __sock_release(SOCKET_I(inode), inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 return 0;
1285}
1286
1287/*
1288 * Update the socket async list
1289 *
1290 * Fasync_list locking strategy.
1291 *
1292 * 1. fasync_list is modified only under process context socket lock
1293 * i.e. under semaphore.
1294 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001295 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 */
1297
1298static int sock_fasync(int fd, struct file *filp, int on)
1299{
Eric Dumazet989a2972010-04-14 09:55:35 +00001300 struct socket *sock = filp->private_data;
1301 struct sock *sk = sock->sk;
Al Viro333f7902019-07-05 20:14:16 +01001302 struct socket_wq *wq = &sock->wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303
Eric Dumazet989a2972010-04-14 09:55:35 +00001304 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306
1307 lock_sock(sk);
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001308 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001310 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001311 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001312 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001313 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314
Eric Dumazet989a2972010-04-14 09:55:35 +00001315 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 return 0;
1317}
1318
Eric Dumazetceb5d582015-11-29 20:03:11 -08001319/* This function may be called only under rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320
Eric Dumazetceb5d582015-11-29 20:03:11 -08001321int sock_wake_async(struct socket_wq *wq, int how, int band)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322{
Eric Dumazetceb5d582015-11-29 20:03:11 -08001323 if (!wq || !wq->fasync_list)
1324 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001325
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001326 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001327 case SOCK_WAKE_WAITD:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001328 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 break;
1330 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001331 case SOCK_WAKE_SPACE:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001332 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 break;
1334 /* fall through */
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001335 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001336call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001337 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001339 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001340 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08001342
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 return 0;
1344}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001345EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001347/**
1348 * __sock_create - creates a socket
1349 * @net: net namespace
1350 * @family: protocol family (AF_INET, ...)
1351 * @type: communication type (SOCK_STREAM, ...)
1352 * @protocol: protocol (0, ...)
1353 * @res: new socket
1354 * @kern: boolean for kernel space sockets
1355 *
1356 * Creates a new socket and assigns it to @res, passing through LSM.
1357 * Returns 0 or an error. On failure @res is set to %NULL. @kern must
1358 * be set to true if the socket resides in kernel space.
1359 * This function internally uses GFP_KERNEL.
1360 */
1361
Pavel Emelyanov721db932010-09-29 16:06:32 +04001362int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001363 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364{
1365 int err;
1366 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001367 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368
1369 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001370 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 */
1372 if (family < 0 || family >= NPROTO)
1373 return -EAFNOSUPPORT;
1374 if (type < 0 || type >= SOCK_MAX)
1375 return -EINVAL;
1376
1377 /* Compatibility.
1378
1379 This uglymoron is moved from INET layer to here to avoid
1380 deadlock in module load.
1381 */
1382 if (family == PF_INET && type == SOCK_PACKET) {
liping.zhangf3c98692016-03-11 23:08:36 +08001383 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1384 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 family = PF_PACKET;
1386 }
1387
1388 err = security_socket_create(family, type, protocol, kern);
1389 if (err)
1390 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001391
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001392 /*
1393 * Allocate the socket and allow the family to set things up. if
1394 * the protocol is 0, the family is instructed to select an appropriate
1395 * default.
1396 */
1397 sock = sock_alloc();
1398 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001399 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001400 return -ENFILE; /* Not exactly a match, but its the
1401 closest posix thing */
1402 }
1403
1404 sock->type = type;
1405
Johannes Berg95a5afc2008-10-16 15:24:51 -07001406#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001407 /* Attempt to load a protocol module if the find failed.
1408 *
1409 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 * requested real, full-featured networking support upon configuration.
1411 * Otherwise module support will break!
1412 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001413 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001414 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415#endif
1416
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001417 rcu_read_lock();
1418 pf = rcu_dereference(net_families[family]);
1419 err = -EAFNOSUPPORT;
1420 if (!pf)
1421 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422
1423 /*
1424 * We will call the ->create function, that possibly is in a loadable
1425 * module, so we have to bump that loadable module refcnt first.
1426 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001427 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 goto out_release;
1429
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001430 /* Now protected by module ref count */
1431 rcu_read_unlock();
1432
Eric Paris3f378b62009-11-05 22:18:14 -08001433 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001434 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001436
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 /*
1438 * Now to bump the refcnt of the [loadable] module that owns this
1439 * socket at sock_release time we decrement its refcnt.
1440 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001441 if (!try_module_get(sock->ops->owner))
1442 goto out_module_busy;
1443
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 /*
1445 * Now that we're done with the ->create function, the [loadable]
1446 * module can have its refcnt decremented
1447 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001448 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001449 err = security_socket_post_create(sock, family, type, protocol, kern);
1450 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001451 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001452 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001454 return 0;
1455
1456out_module_busy:
1457 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001459 sock->ops = NULL;
1460 module_put(pf->owner);
1461out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001463 return err;
1464
1465out_release:
1466 rcu_read_unlock();
1467 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001469EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001471/**
1472 * sock_create - creates a socket
1473 * @family: protocol family (AF_INET, ...)
1474 * @type: communication type (SOCK_STREAM, ...)
1475 * @protocol: protocol (0, ...)
1476 * @res: new socket
1477 *
1478 * A wrapper around __sock_create().
1479 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1480 */
1481
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482int sock_create(int family, int type, int protocol, struct socket **res)
1483{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001484 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001486EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001488/**
1489 * sock_create_kern - creates a socket (kernel space)
1490 * @net: net namespace
1491 * @family: protocol family (AF_INET, ...)
1492 * @type: communication type (SOCK_STREAM, ...)
1493 * @protocol: protocol (0, ...)
1494 * @res: new socket
1495 *
1496 * A wrapper around __sock_create().
1497 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1498 */
1499
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001500int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501{
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001502 return __sock_create(net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001504EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001506int __sys_socket(int family, int type, int protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507{
1508 int retval;
1509 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001510 int flags;
1511
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001512 /* Check the SOCK_* constants for consistency. */
1513 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1514 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1515 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1516 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1517
Ulrich Dreppera677a032008-07-23 21:29:17 -07001518 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001519 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001520 return -EINVAL;
1521 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001523 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1524 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1525
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 retval = sock_create(family, type, protocol, &sock);
1527 if (retval < 0)
Al Viro8e1611e2017-12-05 23:29:09 +00001528 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529
Al Viro8e1611e2017-12-05 23:29:09 +00001530 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531}
1532
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001533SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1534{
1535 return __sys_socket(family, type, protocol);
1536}
1537
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538/*
1539 * Create a pair of connected sockets.
1540 */
1541
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001542int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543{
1544 struct socket *sock1, *sock2;
1545 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001546 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001547 int flags;
1548
1549 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001550 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001551 return -EINVAL;
1552 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001554 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1555 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1556
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557 /*
Al Viro016a2662017-12-05 23:28:38 +00001558 * reserve descriptors and make sure we won't fail
1559 * to return them to userland.
1560 */
1561 fd1 = get_unused_fd_flags(flags);
1562 if (unlikely(fd1 < 0))
1563 return fd1;
1564
1565 fd2 = get_unused_fd_flags(flags);
1566 if (unlikely(fd2 < 0)) {
1567 put_unused_fd(fd1);
1568 return fd2;
1569 }
1570
1571 err = put_user(fd1, &usockvec[0]);
1572 if (err)
1573 goto out;
1574
1575 err = put_user(fd2, &usockvec[1]);
1576 if (err)
1577 goto out;
1578
1579 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 * Obtain the first socket and check if the underlying protocol
1581 * supports the socketpair call.
1582 */
1583
1584 err = sock_create(family, type, protocol, &sock1);
Al Viro016a2662017-12-05 23:28:38 +00001585 if (unlikely(err < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 goto out;
1587
1588 err = sock_create(family, type, protocol, &sock2);
Al Viro016a2662017-12-05 23:28:38 +00001589 if (unlikely(err < 0)) {
1590 sock_release(sock1);
1591 goto out;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001592 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001593
David Herrmannd47cd942018-05-04 16:28:20 +02001594 err = security_socket_socketpair(sock1, sock2);
1595 if (unlikely(err)) {
1596 sock_release(sock2);
1597 sock_release(sock1);
1598 goto out;
1599 }
1600
Al Viro016a2662017-12-05 23:28:38 +00001601 err = sock1->ops->socketpair(sock1, sock2);
1602 if (unlikely(err < 0)) {
1603 sock_release(sock2);
1604 sock_release(sock1);
1605 goto out;
Al Viro28407632012-08-17 23:54:15 -04001606 }
1607
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001608 newfile1 = sock_alloc_file(sock1, flags, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301609 if (IS_ERR(newfile1)) {
Al Viro28407632012-08-17 23:54:15 -04001610 err = PTR_ERR(newfile1);
Al Viro016a2662017-12-05 23:28:38 +00001611 sock_release(sock2);
1612 goto out;
Al Viro28407632012-08-17 23:54:15 -04001613 }
1614
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001615 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001616 if (IS_ERR(newfile2)) {
1617 err = PTR_ERR(newfile2);
Al Viro016a2662017-12-05 23:28:38 +00001618 fput(newfile1);
1619 goto out;
Al Virodb349502007-02-07 01:48:00 -05001620 }
1621
Al Viro157cf642008-12-14 04:57:47 -05001622 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001623
Al Virodb349502007-02-07 01:48:00 -05001624 fd_install(fd1, newfile1);
1625 fd_install(fd2, newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001626 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628out:
Al Viro016a2662017-12-05 23:28:38 +00001629 put_unused_fd(fd2);
1630 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631 return err;
1632}
1633
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001634SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1635 int __user *, usockvec)
1636{
1637 return __sys_socketpair(family, type, protocol, usockvec);
1638}
1639
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640/*
1641 * Bind a name to a socket. Nothing much to do here since it's
1642 * the protocol's responsibility to handle the local address.
1643 *
1644 * We move the socket address to kernel space before we call
1645 * the protocol layer (having also checked the address is ok).
1646 */
1647
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001648int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649{
1650 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001651 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001652 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001654 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001655 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001656 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Jakub Sitnicki068b88c2018-10-04 11:09:40 +02001657 if (!err) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001658 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001659 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001660 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001661 if (!err)
1662 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001663 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001664 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001666 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001667 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668 return err;
1669}
1670
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001671SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1672{
1673 return __sys_bind(fd, umyaddr, addrlen);
1674}
1675
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676/*
1677 * Perform a listen. Basically, we allow the protocol to do anything
1678 * necessary for a listen, and if that works, we mark the socket as
1679 * ready for listening.
1680 */
1681
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001682int __sys_listen(int fd, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683{
1684 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001685 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001686 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001687
1688 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1689 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001690 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001691 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001692 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693
1694 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001695 if (!err)
1696 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001698 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 }
1700 return err;
1701}
1702
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001703SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1704{
1705 return __sys_listen(fd, backlog);
1706}
1707
Jens Axboede2ea4b2019-10-17 14:41:29 -06001708int __sys_accept4_file(struct file *file, unsigned file_flags,
1709 struct sockaddr __user *upeer_sockaddr,
1710 int __user *upeer_addrlen, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711{
1712 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001713 struct file *newfile;
Jens Axboede2ea4b2019-10-17 14:41:29 -06001714 int err, len, newfd;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001715 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716
Ulrich Drepper77d27202008-07-23 21:29:35 -07001717 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001718 return -EINVAL;
1719
1720 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1721 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1722
Jens Axboede2ea4b2019-10-17 14:41:29 -06001723 sock = sock_from_file(file, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724 if (!sock)
1725 goto out;
1726
1727 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001728 newsock = sock_alloc();
1729 if (!newsock)
Jens Axboede2ea4b2019-10-17 14:41:29 -06001730 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731
1732 newsock->type = sock->type;
1733 newsock->ops = sock->ops;
1734
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735 /*
1736 * We don't need try_module_get here, as the listening socket (sock)
1737 * has the protocol module (sock->ops->owner) held.
1738 */
1739 __module_get(newsock->ops->owner);
1740
Al Viro28407632012-08-17 23:54:15 -04001741 newfd = get_unused_fd_flags(flags);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001742 if (unlikely(newfd < 0)) {
1743 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001744 sock_release(newsock);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001745 goto out;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001746 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001747 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301748 if (IS_ERR(newfile)) {
Al Viro28407632012-08-17 23:54:15 -04001749 err = PTR_ERR(newfile);
1750 put_unused_fd(newfd);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001751 goto out;
Al Viro28407632012-08-17 23:54:15 -04001752 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001753
Frank Filza79af592005-09-27 15:23:38 -07001754 err = security_socket_accept(sock, newsock);
1755 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001756 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001757
Jens Axboede2ea4b2019-10-17 14:41:29 -06001758 err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags,
1759 false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001761 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762
1763 if (upeer_sockaddr) {
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001764 len = newsock->ops->getname(newsock,
1765 (struct sockaddr *)&address, 2);
1766 if (len < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001768 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001770 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001771 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001773 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774 }
1775
1776 /* File flags are not inherited via accept() unlike another OSes. */
1777
David S. Miller39d8c1b2006-03-20 17:13:49 -08001778 fd_install(newfd, newfile);
1779 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780out:
1781 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001782out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001783 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001784 put_unused_fd(newfd);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001785 goto out;
1786
1787}
1788
1789/*
1790 * For accept, we attempt to create a new socket, set up the link
1791 * with the client, wake up the client, then return the new
1792 * connected fd. We collect the address of the connector in kernel
1793 * space and move it to user at the very end. This is unclean because
1794 * we open the socket then return an error.
1795 *
1796 * 1003.1g adds the ability to recvmsg() to query connection pending
1797 * status to recvmsg. We need to add that support in a way thats
1798 * clean when we restructure accept also.
1799 */
1800
1801int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
1802 int __user *upeer_addrlen, int flags)
1803{
1804 int ret = -EBADF;
1805 struct fd f;
1806
1807 f = fdget(fd);
1808 if (f.file) {
1809 ret = __sys_accept4_file(f.file, 0, upeer_sockaddr,
1810 upeer_addrlen, flags);
1811 if (f.flags)
1812 fput(f.file);
1813 }
1814
1815 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816}
1817
Dominik Brodowski4541e802018-03-13 19:24:23 +01001818SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1819 int __user *, upeer_addrlen, int, flags)
1820{
1821 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
1822}
1823
Heiko Carstens20f37032009-01-14 14:14:23 +01001824SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1825 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001826{
Dominik Brodowski4541e802018-03-13 19:24:23 +01001827 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001828}
1829
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830/*
1831 * Attempt to connect to a socket with the server address. The address
1832 * is in user space so we verify it is OK and move it to kernel space.
1833 *
1834 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1835 * break bindings
1836 *
1837 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1838 * other SEQPACKET protocols that take time to connect() as it doesn't
1839 * include the -EINPROGRESS status for such sockets.
1840 */
1841
Jens Axboef499a022019-12-02 16:28:46 -07001842int __sys_connect_file(struct file *file, struct sockaddr_storage *address,
Jens Axboebd3ded32019-11-23 14:17:16 -07001843 int addrlen, int file_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844{
1845 struct socket *sock;
Jens Axboebd3ded32019-11-23 14:17:16 -07001846 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847
Jens Axboebd3ded32019-11-23 14:17:16 -07001848 sock = sock_from_file(file, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849 if (!sock)
1850 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001852 err =
Jens Axboef499a022019-12-02 16:28:46 -07001853 security_socket_connect(sock, (struct sockaddr *)address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854 if (err)
Jens Axboebd3ded32019-11-23 14:17:16 -07001855 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856
Jens Axboef499a022019-12-02 16:28:46 -07001857 err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,
Jens Axboebd3ded32019-11-23 14:17:16 -07001858 sock->file->f_flags | file_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859out:
1860 return err;
1861}
1862
Jens Axboebd3ded32019-11-23 14:17:16 -07001863int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
1864{
1865 int ret = -EBADF;
1866 struct fd f;
1867
1868 f = fdget(fd);
1869 if (f.file) {
Jens Axboef499a022019-12-02 16:28:46 -07001870 struct sockaddr_storage address;
1871
1872 ret = move_addr_to_kernel(uservaddr, addrlen, &address);
1873 if (!ret)
1874 ret = __sys_connect_file(f.file, &address, addrlen, 0);
Jens Axboebd3ded32019-11-23 14:17:16 -07001875 if (f.flags)
1876 fput(f.file);
1877 }
1878
1879 return ret;
1880}
1881
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01001882SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1883 int, addrlen)
1884{
1885 return __sys_connect(fd, uservaddr, addrlen);
1886}
1887
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888/*
1889 * Get the local address ('name') of a socket object. Move the obtained
1890 * name to user space.
1891 */
1892
Dominik Brodowski8882a102018-03-13 19:43:14 +01001893int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1894 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895{
1896 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001897 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001898 int err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001899
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001900 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 if (!sock)
1902 goto out;
1903
1904 err = security_socket_getsockname(sock);
1905 if (err)
1906 goto out_put;
1907
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001908 err = sock->ops->getname(sock, (struct sockaddr *)&address, 0);
1909 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910 goto out_put;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001911 /* "err" is actually length in this case */
1912 err = move_addr_to_user(&address, err, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913
1914out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001915 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916out:
1917 return err;
1918}
1919
Dominik Brodowski8882a102018-03-13 19:43:14 +01001920SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1921 int __user *, usockaddr_len)
1922{
1923 return __sys_getsockname(fd, usockaddr, usockaddr_len);
1924}
1925
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926/*
1927 * Get the remote address ('name') of a socket object. Move the obtained
1928 * name to user space.
1929 */
1930
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001931int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1932 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933{
1934 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001935 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001936 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001938 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1939 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940 err = security_socket_getpeername(sock);
1941 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001942 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943 return err;
1944 }
1945
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001946 err = sock->ops->getname(sock, (struct sockaddr *)&address, 1);
1947 if (err >= 0)
1948 /* "err" is actually length in this case */
1949 err = move_addr_to_user(&address, err, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001950 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001951 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952 }
1953 return err;
1954}
1955
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001956SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1957 int __user *, usockaddr_len)
1958{
1959 return __sys_getpeername(fd, usockaddr, usockaddr_len);
1960}
1961
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962/*
1963 * Send a datagram to a given address. We move the address into kernel
1964 * space and check the user space data area is readable before invoking
1965 * the protocol.
1966 */
Dominik Brodowski211b6342018-03-13 19:18:52 +01001967int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
1968 struct sockaddr __user *addr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969{
1970 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001971 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 int err;
1973 struct msghdr msg;
1974 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001975 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001976
Al Viro602bd0e2015-03-21 19:12:32 -04001977 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
1978 if (unlikely(err))
1979 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001980 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1981 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001982 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001983
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001984 msg.msg_name = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001985 msg.msg_control = NULL;
1986 msg.msg_controllen = 0;
1987 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001988 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001989 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990 if (err < 0)
1991 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001992 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001993 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994 }
1995 if (sock->file->f_flags & O_NONBLOCK)
1996 flags |= MSG_DONTWAIT;
1997 msg.msg_flags = flags;
Al Virod8725c82014-12-11 00:02:50 -05001998 err = sock_sendmsg(sock, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002000out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002001 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08002002out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 return err;
2004}
2005
Dominik Brodowski211b6342018-03-13 19:18:52 +01002006SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
2007 unsigned int, flags, struct sockaddr __user *, addr,
2008 int, addr_len)
2009{
2010 return __sys_sendto(fd, buff, len, flags, addr, addr_len);
2011}
2012
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002014 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002015 */
2016
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002017SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00002018 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002019{
Dominik Brodowski211b6342018-03-13 19:18:52 +01002020 return __sys_sendto(fd, buff, len, flags, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021}
2022
2023/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002024 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025 * sender. We verify the buffers are writable and if needed move the
2026 * sender address from kernel to user space.
2027 */
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002028int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
2029 struct sockaddr __user *addr, int __user *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030{
2031 struct socket *sock;
2032 struct iovec iov;
2033 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002034 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002035 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002036 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037
Al Viro602bd0e2015-03-21 19:12:32 -04002038 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
2039 if (unlikely(err))
2040 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002041 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002043 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002044
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002045 msg.msg_control = NULL;
2046 msg.msg_controllen = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002047 /* Save some cycles and don't copy the address if not needed */
2048 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
2049 /* We assume all kernel code knows the size of sockaddr_storage */
2050 msg.msg_namelen = 0;
tadeusz.struk@intel.com130ed5d2015-12-15 10:46:17 -08002051 msg.msg_iocb = NULL;
Alexander Potapenko9f138fa2017-03-08 18:08:16 +01002052 msg.msg_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002053 if (sock->file->f_flags & O_NONBLOCK)
2054 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002055 err = sock_recvmsg(sock, &msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002057 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002058 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002059 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002060 if (err2 < 0)
2061 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002063
2064 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08002065out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066 return err;
2067}
2068
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002069SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
2070 unsigned int, flags, struct sockaddr __user *, addr,
2071 int __user *, addr_len)
2072{
2073 return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len);
2074}
2075
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002077 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078 */
2079
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02002080SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
2081 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082{
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002083 return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084}
2085
2086/*
2087 * Set a socket option. Because we don't know the option lengths we have
2088 * to pass the user mode parameter for the protocols to sort out.
2089 */
2090
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002091static int __sys_setsockopt(int fd, int level, int optname,
2092 char __user *optval, int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002093{
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002094 mm_segment_t oldfs = get_fs();
2095 char *kernel_optval = NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002096 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097 struct socket *sock;
2098
2099 if (optlen < 0)
2100 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002101
2102 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2103 if (sock != NULL) {
2104 err = security_socket_setsockopt(sock, level, optname);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002105 if (err)
2106 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002108 err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level,
2109 &optname, optval, &optlen,
2110 &kernel_optval);
2111
2112 if (err < 0) {
2113 goto out_put;
2114 } else if (err > 0) {
2115 err = 0;
2116 goto out_put;
2117 }
2118
2119 if (kernel_optval) {
2120 set_fs(KERNEL_DS);
2121 optval = (char __user __force *)kernel_optval;
2122 }
2123
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002125 err =
2126 sock_setsockopt(sock, level, optname, optval,
2127 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002128 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002129 err =
2130 sock->ops->setsockopt(sock, level, optname, optval,
2131 optlen);
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002132
2133 if (kernel_optval) {
2134 set_fs(oldfs);
2135 kfree(kernel_optval);
2136 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002137out_put:
2138 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139 }
2140 return err;
2141}
2142
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002143SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
2144 char __user *, optval, int, optlen)
2145{
2146 return __sys_setsockopt(fd, level, optname, optval, optlen);
2147}
2148
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149/*
2150 * Get a socket option. Because we don't know the option lengths we have
2151 * to pass a user mode parameter for the protocols to sort out.
2152 */
2153
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002154static int __sys_getsockopt(int fd, int level, int optname,
2155 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002156{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002157 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002158 struct socket *sock;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002159 int max_optlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002161 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2162 if (sock != NULL) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002163 err = security_socket_getsockopt(sock, level, optname);
2164 if (err)
2165 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002167 max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen);
2168
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169 if (level == SOL_SOCKET)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002170 err =
2171 sock_getsockopt(sock, level, optname, optval,
2172 optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002173 else
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002174 err =
2175 sock->ops->getsockopt(sock, level, optname, optval,
2176 optlen);
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002177
2178 err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname,
2179 optval, optlen,
2180 max_optlen, err);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002181out_put:
2182 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002183 }
2184 return err;
2185}
2186
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002187SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
2188 char __user *, optval, int __user *, optlen)
2189{
2190 return __sys_getsockopt(fd, level, optname, optval, optlen);
2191}
2192
Linus Torvalds1da177e2005-04-16 15:20:36 -07002193/*
2194 * Shutdown a socket.
2195 */
2196
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002197int __sys_shutdown(int fd, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002198{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002199 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200 struct socket *sock;
2201
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002202 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2203 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002204 err = security_socket_shutdown(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002205 if (!err)
2206 err = sock->ops->shutdown(sock, how);
2207 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002208 }
2209 return err;
2210}
2211
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002212SYSCALL_DEFINE2(shutdown, int, fd, int, how)
2213{
2214 return __sys_shutdown(fd, how);
2215}
2216
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002217/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07002218 * fields which are the same type (int / unsigned) on our platforms.
2219 */
2220#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
2221#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
2222#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
2223
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002224struct used_address {
2225 struct sockaddr_storage name;
2226 unsigned int name_len;
2227};
2228
Jens Axboe0a384ab2020-02-27 08:11:20 -07002229int __copy_msghdr_from_user(struct msghdr *kmsg,
2230 struct user_msghdr __user *umsg,
2231 struct sockaddr __user **save_addr,
2232 struct iovec __user **uiov, size_t *nsegs)
Dan Carpenter1661bf32013-10-03 00:27:20 +03002233{
Al Viroffb07552017-06-27 19:32:04 -04002234 struct user_msghdr msg;
Al Viro08adb7d2014-11-10 20:23:13 -05002235 ssize_t err;
2236
Al Viroffb07552017-06-27 19:32:04 -04002237 if (copy_from_user(&msg, umsg, sizeof(*umsg)))
Dan Carpenter1661bf32013-10-03 00:27:20 +03002238 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00002239
Paolo Abeni864d9662017-07-21 18:49:45 +02002240 kmsg->msg_control = (void __force *)msg.msg_control;
Al Viroffb07552017-06-27 19:32:04 -04002241 kmsg->msg_controllen = msg.msg_controllen;
2242 kmsg->msg_flags = msg.msg_flags;
2243
2244 kmsg->msg_namelen = msg.msg_namelen;
2245 if (!msg.msg_name)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07002246 kmsg->msg_namelen = 0;
2247
Matthew Leachdbb490b2014-03-11 11:58:27 +00002248 if (kmsg->msg_namelen < 0)
2249 return -EINVAL;
2250
Dan Carpenter1661bf32013-10-03 00:27:20 +03002251 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03002252 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05002253
2254 if (save_addr)
Al Viroffb07552017-06-27 19:32:04 -04002255 *save_addr = msg.msg_name;
Al Viro08adb7d2014-11-10 20:23:13 -05002256
Al Viroffb07552017-06-27 19:32:04 -04002257 if (msg.msg_name && kmsg->msg_namelen) {
Al Viro08adb7d2014-11-10 20:23:13 -05002258 if (!save_addr) {
Paolo Abeni864d9662017-07-21 18:49:45 +02002259 err = move_addr_to_kernel(msg.msg_name,
2260 kmsg->msg_namelen,
Al Viro08adb7d2014-11-10 20:23:13 -05002261 kmsg->msg_name);
2262 if (err < 0)
2263 return err;
2264 }
2265 } else {
2266 kmsg->msg_name = NULL;
2267 kmsg->msg_namelen = 0;
2268 }
2269
Al Viroffb07552017-06-27 19:32:04 -04002270 if (msg.msg_iovlen > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05002271 return -EMSGSIZE;
2272
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002273 kmsg->msg_iocb = NULL;
Jens Axboe0a384ab2020-02-27 08:11:20 -07002274 *uiov = msg.msg_iov;
2275 *nsegs = msg.msg_iovlen;
2276 return 0;
2277}
2278
2279static int copy_msghdr_from_user(struct msghdr *kmsg,
2280 struct user_msghdr __user *umsg,
2281 struct sockaddr __user **save_addr,
2282 struct iovec **iov)
2283{
2284 struct user_msghdr msg;
2285 ssize_t err;
2286
2287 err = __copy_msghdr_from_user(kmsg, umsg, save_addr, &msg.msg_iov,
2288 &msg.msg_iovlen);
2289 if (err)
2290 return err;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002291
Jens Axboe87e5e6d2019-05-14 16:02:22 -06002292 err = import_iovec(save_addr ? READ : WRITE,
Al Viroffb07552017-06-27 19:32:04 -04002293 msg.msg_iov, msg.msg_iovlen,
Al Viroda184282015-03-21 19:29:06 -04002294 UIO_FASTIOV, iov, &kmsg->msg_iter);
Jens Axboe87e5e6d2019-05-14 16:02:22 -06002295 return err < 0 ? err : 0;
Dan Carpenter1661bf32013-10-03 00:27:20 +03002296}
2297
Jens Axboe4257c8c2019-11-25 14:27:34 -07002298static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys,
2299 unsigned int flags, struct used_address *used_address,
2300 unsigned int allowed_msghdr_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002301{
Alex Williamsonb9d717a2005-09-26 14:28:02 -07002302 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Amit Kushwaha846cc122016-12-08 18:21:53 +05302303 __aligned(sizeof(__kernel_size_t));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002304 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002305 unsigned char *ctl_buf = ctl;
Al Virod8725c82014-12-11 00:02:50 -05002306 int ctl_len;
Al Viro08adb7d2014-11-10 20:23:13 -05002307 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002308
Linus Torvalds1da177e2005-04-16 15:20:36 -07002309 err = -ENOBUFS;
2310
Anton Blanchard228e5482011-05-02 20:21:35 +00002311 if (msg_sys->msg_controllen > INT_MAX)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002312 goto out;
Tom Herbert28a94d82016-03-07 14:11:02 -08002313 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
Anton Blanchard228e5482011-05-02 20:21:35 +00002314 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002315 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002316 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00002317 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002318 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002320 goto out;
Anton Blanchard228e5482011-05-02 20:21:35 +00002321 ctl_buf = msg_sys->msg_control;
2322 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002323 } else if (ctl_len) {
David S. Millerac4340f2017-01-04 13:24:19 -05002324 BUILD_BUG_ON(sizeof(struct cmsghdr) !=
2325 CMSG_ALIGN(sizeof(struct cmsghdr)));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002326 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002327 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002328 if (ctl_buf == NULL)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002329 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002330 }
2331 err = -EFAULT;
2332 /*
Anton Blanchard228e5482011-05-02 20:21:35 +00002333 * Careful! Before this, msg_sys->msg_control contains a user pointer.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002334 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2335 * checking falls down on this.
2336 */
Namhyung Kimfb8621b2010-09-07 03:55:00 +00002337 if (copy_from_user(ctl_buf,
Anton Blanchard228e5482011-05-02 20:21:35 +00002338 (void __user __force *)msg_sys->msg_control,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002339 ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00002341 msg_sys->msg_control = ctl_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002342 }
Anton Blanchard228e5482011-05-02 20:21:35 +00002343 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002344
2345 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00002346 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002347 /*
2348 * If this is sendmmsg() and current destination address is same as
2349 * previously succeeded address, omit asking LSM's decision.
2350 * used_address->name_len is initialized to UINT_MAX so that the first
2351 * destination address never matches.
2352 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002353 if (used_address && msg_sys->msg_name &&
2354 used_address->name_len == msg_sys->msg_namelen &&
2355 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002356 used_address->name_len)) {
Al Virod8725c82014-12-11 00:02:50 -05002357 err = sock_sendmsg_nosec(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002358 goto out_freectl;
2359 }
Al Virod8725c82014-12-11 00:02:50 -05002360 err = sock_sendmsg(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002361 /*
2362 * If this is sendmmsg() and sending to current destination address was
2363 * successful, remember it.
2364 */
2365 if (used_address && err >= 0) {
2366 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002367 if (msg_sys->msg_name)
2368 memcpy(&used_address->name, msg_sys->msg_name,
2369 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002370 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002371
2372out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002373 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002374 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
Jens Axboe4257c8c2019-11-25 14:27:34 -07002375out:
2376 return err;
2377}
2378
Jens Axboe03b12302019-12-02 18:50:25 -07002379int sendmsg_copy_msghdr(struct msghdr *msg,
2380 struct user_msghdr __user *umsg, unsigned flags,
2381 struct iovec **iov)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002382{
2383 int err;
2384
2385 if (flags & MSG_CMSG_COMPAT) {
2386 struct compat_msghdr __user *msg_compat;
2387
2388 msg_compat = (struct compat_msghdr __user *) umsg;
2389 err = get_compat_msghdr(msg, msg_compat, NULL, iov);
2390 } else {
2391 err = copy_msghdr_from_user(msg, umsg, NULL, iov);
2392 }
2393 if (err < 0)
2394 return err;
2395
2396 return 0;
2397}
2398
2399static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
2400 struct msghdr *msg_sys, unsigned int flags,
2401 struct used_address *used_address,
2402 unsigned int allowed_msghdr_flags)
2403{
2404 struct sockaddr_storage address;
2405 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2406 ssize_t err;
2407
2408 msg_sys->msg_name = &address;
2409
2410 err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov);
2411 if (err < 0)
2412 return err;
2413
2414 err = ____sys_sendmsg(sock, msg_sys, flags, used_address,
2415 allowed_msghdr_flags);
Al Viroda184282015-03-21 19:29:06 -04002416 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00002417 return err;
2418}
2419
2420/*
2421 * BSD sendmsg interface
2422 */
Jens Axboe03b12302019-12-02 18:50:25 -07002423long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,
Jens Axboe0fa03c62019-04-19 13:34:07 -06002424 unsigned int flags)
2425{
Jens Axboed69e0772019-11-25 17:04:13 -07002426 /* disallow ancillary data requests from this path */
Jens Axboe03b12302019-12-02 18:50:25 -07002427 if (msg->msg_control || msg->msg_controllen)
2428 return -EINVAL;
Jens Axboed69e0772019-11-25 17:04:13 -07002429
Jens Axboe03b12302019-12-02 18:50:25 -07002430 return ____sys_sendmsg(sock, msg, flags, NULL, 0);
Jens Axboe0fa03c62019-04-19 13:34:07 -06002431}
Anton Blanchard228e5482011-05-02 20:21:35 +00002432
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002433long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2434 bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002435{
2436 int fput_needed, err;
2437 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002438 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00002439
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002440 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2441 return -EINVAL;
2442
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002443 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00002444 if (!sock)
2445 goto out;
2446
Tom Herbert28a94d82016-03-07 14:11:02 -08002447 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
Anton Blanchard228e5482011-05-02 20:21:35 +00002448
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002449 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002450out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002451 return err;
2452}
2453
Al Viro666547f2014-04-06 14:03:05 -04002454SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002455{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002456 return __sys_sendmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002457}
2458
Anton Blanchard228e5482011-05-02 20:21:35 +00002459/*
2460 * Linux sendmmsg interface
2461 */
2462
2463int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002464 unsigned int flags, bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002465{
2466 int fput_needed, err, datagrams;
2467 struct socket *sock;
2468 struct mmsghdr __user *entry;
2469 struct compat_mmsghdr __user *compat_entry;
2470 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002471 struct used_address used_address;
Tom Herbertf0922762016-03-07 14:11:03 -08002472 unsigned int oflags = flags;
Anton Blanchard228e5482011-05-02 20:21:35 +00002473
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002474 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2475 return -EINVAL;
2476
Anton Blanchard98382f42011-08-04 14:07:39 +00002477 if (vlen > UIO_MAXIOV)
2478 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002479
2480 datagrams = 0;
2481
2482 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2483 if (!sock)
2484 return err;
2485
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002486 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002487 entry = mmsg;
2488 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002489 err = 0;
Tom Herbertf0922762016-03-07 14:11:03 -08002490 flags |= MSG_BATCH;
Anton Blanchard228e5482011-05-02 20:21:35 +00002491
2492 while (datagrams < vlen) {
Tom Herbertf0922762016-03-07 14:11:03 -08002493 if (datagrams == vlen - 1)
2494 flags = oflags;
2495
Anton Blanchard228e5482011-05-02 20:21:35 +00002496 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002497 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002498 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002499 if (err < 0)
2500 break;
2501 err = __put_user(err, &compat_entry->msg_len);
2502 ++compat_entry;
2503 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002504 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002505 (struct user_msghdr __user *)entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002506 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002507 if (err < 0)
2508 break;
2509 err = put_user(err, &entry->msg_len);
2510 ++entry;
2511 }
2512
2513 if (err)
2514 break;
2515 ++datagrams;
Soheil Hassas Yeganeh30238982016-11-04 15:36:49 -04002516 if (msg_data_left(&msg_sys))
2517 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002518 cond_resched();
Anton Blanchard228e5482011-05-02 20:21:35 +00002519 }
2520
Anton Blanchard228e5482011-05-02 20:21:35 +00002521 fput_light(sock->file, fput_needed);
2522
Anton Blanchard728ffb82011-08-04 14:07:38 +00002523 /* We only return an error if no datagrams were able to be sent */
2524 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002525 return datagrams;
2526
Anton Blanchard228e5482011-05-02 20:21:35 +00002527 return err;
2528}
2529
2530SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2531 unsigned int, vlen, unsigned int, flags)
2532{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002533 return __sys_sendmmsg(fd, mmsg, vlen, flags, true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002534}
2535
Jens Axboe03b12302019-12-02 18:50:25 -07002536int recvmsg_copy_msghdr(struct msghdr *msg,
2537 struct user_msghdr __user *umsg, unsigned flags,
2538 struct sockaddr __user **uaddr,
2539 struct iovec **iov)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002540{
2541 ssize_t err;
2542
2543 if (MSG_CMSG_COMPAT & flags) {
2544 struct compat_msghdr __user *msg_compat;
2545
2546 msg_compat = (struct compat_msghdr __user *) umsg;
2547 err = get_compat_msghdr(msg, msg_compat, uaddr, iov);
2548 } else {
2549 err = copy_msghdr_from_user(msg, umsg, uaddr, iov);
2550 }
2551 if (err < 0)
2552 return err;
2553
2554 return 0;
2555}
2556
2557static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys,
2558 struct user_msghdr __user *msg,
2559 struct sockaddr __user *uaddr,
2560 unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002561{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002562 struct compat_msghdr __user *msg_compat =
Jens Axboe4257c8c2019-11-25 14:27:34 -07002563 (struct compat_msghdr __user *) msg;
2564 int __user *uaddr_len = COMPAT_NAMELEN(msg);
2565 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002566 unsigned long cmsg_ptr;
Al Viro2da62902015-03-14 21:13:46 -04002567 int len;
Al Viro08adb7d2014-11-10 20:23:13 -05002568 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002569
Al Viro08adb7d2014-11-10 20:23:13 -05002570 msg_sys->msg_name = &addr;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002571 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2572 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002573
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002574 /* We assume all kernel code knows the size of sockaddr_storage */
2575 msg_sys->msg_namelen = 0;
2576
Linus Torvalds1da177e2005-04-16 15:20:36 -07002577 if (sock->file->f_flags & O_NONBLOCK)
2578 flags |= MSG_DONTWAIT;
Eric Dumazet1af66222019-12-06 09:38:36 -08002579
2580 if (unlikely(nosec))
2581 err = sock_recvmsg_nosec(sock, msg_sys, flags);
2582 else
2583 err = sock_recvmsg(sock, msg_sys, flags);
2584
Linus Torvalds1da177e2005-04-16 15:20:36 -07002585 if (err < 0)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002586 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002587 len = err;
2588
2589 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002590 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002591 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002592 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002593 if (err < 0)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002594 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002595 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002596 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002597 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002598 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002599 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002600 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002601 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002602 &msg_compat->msg_controllen);
2603 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002604 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002605 &msg->msg_controllen);
2606 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002607 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002608 err = len;
Jens Axboe4257c8c2019-11-25 14:27:34 -07002609out:
2610 return err;
2611}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002612
Jens Axboe4257c8c2019-11-25 14:27:34 -07002613static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
2614 struct msghdr *msg_sys, unsigned int flags, int nosec)
2615{
2616 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2617 /* user mode address pointers */
2618 struct sockaddr __user *uaddr;
2619 ssize_t err;
2620
2621 err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov);
2622 if (err < 0)
2623 return err;
2624
2625 err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec);
Al Viroda184282015-03-21 19:29:06 -04002626 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002627 return err;
2628}
2629
2630/*
2631 * BSD recvmsg interface
2632 */
2633
Jens Axboe03b12302019-12-02 18:50:25 -07002634long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg,
2635 struct user_msghdr __user *umsg,
2636 struct sockaddr __user *uaddr, unsigned int flags)
Jens Axboeaa1fa282019-04-19 13:38:09 -06002637{
Jens Axboed69e0772019-11-25 17:04:13 -07002638 /* disallow ancillary data requests from this path */
Jens Axboe03b12302019-12-02 18:50:25 -07002639 if (msg->msg_control || msg->msg_controllen)
2640 return -EINVAL;
Jens Axboed69e0772019-11-25 17:04:13 -07002641
Jens Axboe03b12302019-12-02 18:50:25 -07002642 return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0);
Jens Axboeaa1fa282019-04-19 13:38:09 -06002643}
2644
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002645long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2646 bool forbid_cmsg_compat)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002647{
2648 int fput_needed, err;
2649 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002650 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002651
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002652 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2653 return -EINVAL;
2654
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002655 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002656 if (!sock)
2657 goto out;
2658
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002659 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002660
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002661 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662out:
2663 return err;
2664}
2665
Al Viro666547f2014-04-06 14:03:05 -04002666SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002667 unsigned int, flags)
2668{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002669 return __sys_recvmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002670}
2671
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002672/*
2673 * Linux recvmmsg interface
2674 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002675
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002676static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2677 unsigned int vlen, unsigned int flags,
2678 struct timespec64 *timeout)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002679{
2680 int fput_needed, err, datagrams;
2681 struct socket *sock;
2682 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002683 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002684 struct msghdr msg_sys;
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002685 struct timespec64 end_time;
2686 struct timespec64 timeout64;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002687
2688 if (timeout &&
2689 poll_select_set_timeout(&end_time, timeout->tv_sec,
2690 timeout->tv_nsec))
2691 return -EINVAL;
2692
2693 datagrams = 0;
2694
2695 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2696 if (!sock)
2697 return err;
2698
Soheil Hassas Yeganeh7797dc42018-02-27 18:22:40 -05002699 if (likely(!(flags & MSG_ERRQUEUE))) {
2700 err = sock_error(sock->sk);
2701 if (err) {
2702 datagrams = err;
2703 goto out_put;
2704 }
Maxime Jayate623a9e2017-02-21 18:35:51 +01002705 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002706
2707 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002708 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002709
2710 while (datagrams < vlen) {
2711 /*
2712 * No need to ask LSM for more than the first datagram.
2713 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002714 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002715 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002716 &msg_sys, flags & ~MSG_WAITFORONE,
2717 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002718 if (err < 0)
2719 break;
2720 err = __put_user(err, &compat_entry->msg_len);
2721 ++compat_entry;
2722 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002723 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002724 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002725 &msg_sys, flags & ~MSG_WAITFORONE,
2726 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002727 if (err < 0)
2728 break;
2729 err = put_user(err, &entry->msg_len);
2730 ++entry;
2731 }
2732
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002733 if (err)
2734 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002735 ++datagrams;
2736
Brandon L Black71c5c1592010-03-26 16:18:03 +00002737 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2738 if (flags & MSG_WAITFORONE)
2739 flags |= MSG_DONTWAIT;
2740
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002741 if (timeout) {
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002742 ktime_get_ts64(&timeout64);
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002743 *timeout = timespec64_sub(end_time, timeout64);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002744 if (timeout->tv_sec < 0) {
2745 timeout->tv_sec = timeout->tv_nsec = 0;
2746 break;
2747 }
2748
2749 /* Timeout, return less than vlen datagrams */
2750 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2751 break;
2752 }
2753
2754 /* Out of band data, return right away */
2755 if (msg_sys.msg_flags & MSG_OOB)
2756 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002757 cond_resched();
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002758 }
2759
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002760 if (err == 0)
2761 goto out_put;
2762
2763 if (datagrams == 0) {
2764 datagrams = err;
2765 goto out_put;
2766 }
2767
2768 /*
2769 * We may return less entries than requested (vlen) if the
2770 * sock is non block and there aren't enough datagrams...
2771 */
2772 if (err != -EAGAIN) {
2773 /*
2774 * ... or if recvmsg returns an error after we
2775 * received some datagrams, where we record the
2776 * error to return on the next call or if the
2777 * app asks about it using getsockopt(SO_ERROR).
2778 */
2779 sock->sk->sk_err = -err;
2780 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002781out_put:
2782 fput_light(sock->file, fput_needed);
2783
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002784 return datagrams;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002785}
2786
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002787int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2788 unsigned int vlen, unsigned int flags,
2789 struct __kernel_timespec __user *timeout,
2790 struct old_timespec32 __user *timeout32)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002791{
2792 int datagrams;
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002793 struct timespec64 timeout_sys;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002794
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002795 if (timeout && get_timespec64(&timeout_sys, timeout))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002796 return -EFAULT;
2797
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002798 if (timeout32 && get_old_timespec32(&timeout_sys, timeout32))
2799 return -EFAULT;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002800
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002801 if (!timeout && !timeout32)
2802 return do_recvmmsg(fd, mmsg, vlen, flags, NULL);
2803
2804 datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2805
2806 if (datagrams <= 0)
2807 return datagrams;
2808
2809 if (timeout && put_timespec64(&timeout_sys, timeout))
2810 datagrams = -EFAULT;
2811
2812 if (timeout32 && put_old_timespec32(&timeout_sys, timeout32))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002813 datagrams = -EFAULT;
2814
2815 return datagrams;
2816}
2817
Dominik Brodowski1255e262018-03-13 20:44:21 +01002818SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2819 unsigned int, vlen, unsigned int, flags,
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002820 struct __kernel_timespec __user *, timeout)
Dominik Brodowski1255e262018-03-13 20:44:21 +01002821{
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002822 if (flags & MSG_CMSG_COMPAT)
2823 return -EINVAL;
2824
2825 return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL);
Dominik Brodowski1255e262018-03-13 20:44:21 +01002826}
2827
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002828#ifdef CONFIG_COMPAT_32BIT_TIME
2829SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg,
2830 unsigned int, vlen, unsigned int, flags,
2831 struct old_timespec32 __user *, timeout)
2832{
2833 if (flags & MSG_CMSG_COMPAT)
2834 return -EINVAL;
2835
2836 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout);
2837}
2838#endif
2839
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002840#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002841/* Argument list sizes for sys_socketcall */
2842#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002843static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002844 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2845 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2846 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002847 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002848};
2849
Linus Torvalds1da177e2005-04-16 15:20:36 -07002850#undef AL
2851
2852/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002853 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002854 *
2855 * Argument checking cleaned up. Saved 20% in size.
2856 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002857 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002858 */
2859
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002860SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002861{
Chen Gang2950fa92013-04-07 16:55:23 +08002862 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002863 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002864 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002865 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002866
Anton Blanchard228e5482011-05-02 20:21:35 +00002867 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002868 return -EINVAL;
Jeremy Clinec8e8cd52018-07-27 22:43:01 +00002869 call = array_index_nospec(call, SYS_SENDMMSG + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002870
Arjan van de Ven47379052009-09-28 12:57:44 -07002871 len = nargs[call];
2872 if (len > sizeof(a))
2873 return -EINVAL;
2874
Linus Torvalds1da177e2005-04-16 15:20:36 -07002875 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002876 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002877 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002878
Chen Gang2950fa92013-04-07 16:55:23 +08002879 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2880 if (err)
2881 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002882
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002883 a0 = a[0];
2884 a1 = a[1];
2885
2886 switch (call) {
2887 case SYS_SOCKET:
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01002888 err = __sys_socket(a0, a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002889 break;
2890 case SYS_BIND:
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01002891 err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002892 break;
2893 case SYS_CONNECT:
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01002894 err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002895 break;
2896 case SYS_LISTEN:
Dominik Brodowski25e290e2018-03-13 19:36:54 +01002897 err = __sys_listen(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002898 break;
2899 case SYS_ACCEPT:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002900 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2901 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002902 break;
2903 case SYS_GETSOCKNAME:
2904 err =
Dominik Brodowski8882a102018-03-13 19:43:14 +01002905 __sys_getsockname(a0, (struct sockaddr __user *)a1,
2906 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002907 break;
2908 case SYS_GETPEERNAME:
2909 err =
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01002910 __sys_getpeername(a0, (struct sockaddr __user *)a1,
2911 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002912 break;
2913 case SYS_SOCKETPAIR:
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01002914 err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002915 break;
2916 case SYS_SEND:
Dominik Brodowskif3bf8962018-03-13 19:52:00 +01002917 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2918 NULL, 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002919 break;
2920 case SYS_SENDTO:
Dominik Brodowski211b6342018-03-13 19:18:52 +01002921 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2922 (struct sockaddr __user *)a[4], a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002923 break;
2924 case SYS_RECV:
Dominik Brodowskid27e9af2018-03-13 19:54:17 +01002925 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2926 NULL, NULL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002927 break;
2928 case SYS_RECVFROM:
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002929 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2930 (struct sockaddr __user *)a[4],
2931 (int __user *)a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002932 break;
2933 case SYS_SHUTDOWN:
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002934 err = __sys_shutdown(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002935 break;
2936 case SYS_SETSOCKOPT:
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002937 err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3],
2938 a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002939 break;
2940 case SYS_GETSOCKOPT:
2941 err =
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002942 __sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2943 (int __user *)a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002944 break;
2945 case SYS_SENDMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002946 err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1,
2947 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002948 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002949 case SYS_SENDMMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002950 err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2],
2951 a[3], true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002952 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002953 case SYS_RECVMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002954 err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1,
2955 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002956 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002957 case SYS_RECVMMSG:
Arnd Bergmann3ca47e92019-04-23 17:43:50 +02002958 if (IS_ENABLED(CONFIG_64BIT))
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002959 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
2960 a[2], a[3],
2961 (struct __kernel_timespec __user *)a[4],
2962 NULL);
2963 else
2964 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
2965 a[2], a[3], NULL,
2966 (struct old_timespec32 __user *)a[4]);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002967 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002968 case SYS_ACCEPT4:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002969 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2970 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002971 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002972 default:
2973 err = -EINVAL;
2974 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002975 }
2976 return err;
2977}
2978
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002979#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002980
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002981/**
2982 * sock_register - add a socket protocol handler
2983 * @ops: description of protocol
2984 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002985 * This function is called by a protocol handler that wants to
2986 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09002987 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002988 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002989 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002990int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002991{
2992 int err;
2993
2994 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08002995 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002996 return -ENOBUFS;
2997 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002998
2999 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00003000 if (rcu_dereference_protected(net_families[ops->family],
3001 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003002 err = -EEXIST;
3003 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00003004 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003005 err = 0;
3006 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003007 spin_unlock(&net_family_lock);
3008
Yang Yingliang3410f222014-02-12 17:09:55 +08003009 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003010 return err;
3011}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003012EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003013
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003014/**
3015 * sock_unregister - remove a protocol handler
3016 * @family: protocol family to remove
3017 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018 * This function is called by a protocol handler that wants to
3019 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003020 * new socket creation.
3021 *
3022 * If protocol handler is a module, then it can use module reference
3023 * counts to protect against new references. If protocol handler is not
3024 * a module then it needs to provide its own protection in
3025 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003026 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07003027void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003028{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07003029 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003030
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003031 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00003032 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003033 spin_unlock(&net_family_lock);
3034
3035 synchronize_rcu();
3036
Yang Yingliang3410f222014-02-12 17:09:55 +08003037 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003038}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003039EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003040
Xin Longbf2ae2e2018-03-10 18:57:50 +08003041bool sock_is_registered(int family)
3042{
Jeremy Cline66b51b02018-08-13 22:23:13 +00003043 return family < NPROTO && rcu_access_pointer(net_families[family]);
Xin Longbf2ae2e2018-03-10 18:57:50 +08003044}
3045
Andi Kleen77d76ea2005-12-22 12:43:42 -08003046static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003047{
Nick Pigginb3e19d92011-01-07 17:50:11 +11003048 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00003049 /*
3050 * Initialize the network sysctl infrastructure.
3051 */
3052 err = net_sysctl_init();
3053 if (err)
3054 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11003055
Linus Torvalds1da177e2005-04-16 15:20:36 -07003056 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003057 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07003058 */
3059 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003060
3061 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003062 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003063 */
3064
3065 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11003066
3067 err = register_filesystem(&sock_fs_type);
3068 if (err)
3069 goto out_fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003070 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11003071 if (IS_ERR(sock_mnt)) {
3072 err = PTR_ERR(sock_mnt);
3073 goto out_mount;
3074 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08003075
3076 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003077 */
3078
3079#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00003080 err = netfilter_init();
3081 if (err)
3082 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003083#endif
David S. Millercbeb3212005-12-22 12:58:55 -08003084
Daniel Borkmann408eccc2014-04-01 16:20:23 +02003085 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00003086
Nick Pigginb3e19d92011-01-07 17:50:11 +11003087out:
3088 return err;
3089
3090out_mount:
3091 unregister_filesystem(&sock_fs_type);
3092out_fs:
3093 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003094}
3095
Andi Kleen77d76ea2005-12-22 12:43:42 -08003096core_initcall(sock_init); /* early initcall */
3097
Linus Torvalds1da177e2005-04-16 15:20:36 -07003098#ifdef CONFIG_PROC_FS
3099void socket_seq_show(struct seq_file *seq)
3100{
Tonghao Zhang648845a2017-12-14 05:51:58 -08003101 seq_printf(seq, "sockets: used %d\n",
3102 sock_inuse_get(seq->private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003103}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003104#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003105
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003106#ifdef CONFIG_COMPAT
Al Viro36fd6332017-06-26 13:19:16 -04003107static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003108{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003109 struct compat_ifconf ifc32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003110 struct ifconf ifc;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003111 int err;
3112
Arnd Bergmann6b960182009-11-06 23:10:54 -08003113 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003114 return -EFAULT;
3115
Al Viro36fd6332017-06-26 13:19:16 -04003116 ifc.ifc_len = ifc32.ifc_len;
3117 ifc.ifc_req = compat_ptr(ifc32.ifcbuf);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003118
Al Viro36fd6332017-06-26 13:19:16 -04003119 rtnl_lock();
3120 err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq));
3121 rtnl_unlock();
Arnd Bergmann7a229382009-11-06 23:00:29 -08003122 if (err)
3123 return err;
3124
Al Viro36fd6332017-06-26 13:19:16 -04003125 ifc32.ifc_len = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08003126 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003127 return -EFAULT;
3128
3129 return 0;
3130}
3131
Arnd Bergmann6b960182009-11-06 23:10:54 -08003132static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003133{
Ben Hutchings3a7da392011-03-17 07:34:32 +00003134 struct compat_ethtool_rxnfc __user *compat_rxnfc;
3135 bool convert_in = false, convert_out = false;
Al Viro44c02a22017-10-05 12:59:44 -04003136 size_t buf_size = 0;
3137 struct ethtool_rxnfc __user *rxnfc = NULL;
3138 struct ifreq ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00003139 u32 rule_cnt = 0, actual_rule_cnt;
3140 u32 ethcmd;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003141 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00003142 int ret;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003143
3144 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
3145 return -EFAULT;
3146
Ben Hutchings3a7da392011-03-17 07:34:32 +00003147 compat_rxnfc = compat_ptr(data);
3148
3149 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003150 return -EFAULT;
3151
Ben Hutchings3a7da392011-03-17 07:34:32 +00003152 /* Most ethtool structures are defined without padding.
3153 * Unfortunately struct ethtool_rxnfc is an exception.
3154 */
3155 switch (ethcmd) {
3156 default:
3157 break;
3158 case ETHTOOL_GRXCLSRLALL:
3159 /* Buffer size is variable */
3160 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
3161 return -EFAULT;
3162 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
3163 return -ENOMEM;
3164 buf_size += rule_cnt * sizeof(u32);
3165 /* fall through */
3166 case ETHTOOL_GRXRINGS:
3167 case ETHTOOL_GRXCLSRLCNT:
3168 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00003169 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00003170 convert_out = true;
3171 /* fall through */
3172 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00003173 buf_size += sizeof(struct ethtool_rxnfc);
3174 convert_in = true;
Al Viro44c02a22017-10-05 12:59:44 -04003175 rxnfc = compat_alloc_user_space(buf_size);
Ben Hutchings3a7da392011-03-17 07:34:32 +00003176 break;
3177 }
3178
Al Viro44c02a22017-10-05 12:59:44 -04003179 if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ))
Ben Hutchings3a7da392011-03-17 07:34:32 +00003180 return -EFAULT;
3181
Al Viro44c02a22017-10-05 12:59:44 -04003182 ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc;
Ben Hutchings3a7da392011-03-17 07:34:32 +00003183
3184 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00003185 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00003186 * fs.ring_cookie and at the end of fs, but nowhere else.
3187 */
Alexander Duyck127fe532011-04-08 18:01:59 +00003188 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
3189 sizeof(compat_rxnfc->fs.m_ext) !=
3190 offsetof(struct ethtool_rxnfc, fs.m_ext) +
3191 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00003192 BUILD_BUG_ON(
3193 offsetof(struct compat_ethtool_rxnfc, fs.location) -
3194 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
3195 offsetof(struct ethtool_rxnfc, fs.location) -
3196 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
3197
3198 if (copy_in_user(rxnfc, compat_rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00003199 (void __user *)(&rxnfc->fs.m_ext + 1) -
3200 (void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00003201 copy_in_user(&rxnfc->fs.ring_cookie,
3202 &compat_rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00003203 (void __user *)(&rxnfc->fs.location + 1) -
Wenwen Wangb6168562018-10-18 09:36:46 -05003204 (void __user *)&rxnfc->fs.ring_cookie))
3205 return -EFAULT;
3206 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
3207 if (put_user(rule_cnt, &rxnfc->rule_cnt))
3208 return -EFAULT;
3209 } else if (copy_in_user(&rxnfc->rule_cnt,
3210 &compat_rxnfc->rule_cnt,
3211 sizeof(rxnfc->rule_cnt)))
Ben Hutchings3a7da392011-03-17 07:34:32 +00003212 return -EFAULT;
3213 }
3214
Al Viro44c02a22017-10-05 12:59:44 -04003215 ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL);
Ben Hutchings3a7da392011-03-17 07:34:32 +00003216 if (ret)
3217 return ret;
3218
3219 if (convert_out) {
3220 if (copy_in_user(compat_rxnfc, rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00003221 (const void __user *)(&rxnfc->fs.m_ext + 1) -
3222 (const void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00003223 copy_in_user(&compat_rxnfc->fs.ring_cookie,
3224 &rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00003225 (const void __user *)(&rxnfc->fs.location + 1) -
3226 (const void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00003227 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
3228 sizeof(rxnfc->rule_cnt)))
3229 return -EFAULT;
3230
3231 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
3232 /* As an optimisation, we only copy the actual
3233 * number of rules that the underlying
3234 * function returned. Since Mallory might
3235 * change the rule count in user memory, we
3236 * check that it is less than the rule count
3237 * originally given (as the user buffer size),
3238 * which has been range-checked.
3239 */
3240 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
3241 return -EFAULT;
3242 if (actual_rule_cnt < rule_cnt)
3243 rule_cnt = actual_rule_cnt;
3244 if (copy_in_user(&compat_rxnfc->rule_locs[0],
3245 &rxnfc->rule_locs[0],
3246 rule_cnt * sizeof(u32)))
3247 return -EFAULT;
3248 }
3249 }
3250
3251 return 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003252}
3253
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003254static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
3255{
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003256 compat_uptr_t uptr32;
Al Viro44c02a22017-10-05 12:59:44 -04003257 struct ifreq ifr;
3258 void __user *saved;
3259 int err;
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003260
Al Viro44c02a22017-10-05 12:59:44 -04003261 if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003262 return -EFAULT;
3263
3264 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
3265 return -EFAULT;
3266
Al Viro44c02a22017-10-05 12:59:44 -04003267 saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc;
3268 ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003269
Al Viro44c02a22017-10-05 12:59:44 -04003270 err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL);
3271 if (!err) {
3272 ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved;
3273 if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq)))
3274 err = -EFAULT;
Joe Perchesccbd6a52010-05-14 10:58:26 +00003275 }
Al Viro44c02a22017-10-05 12:59:44 -04003276 return err;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003277}
3278
Ben Hutchings590d4692013-11-18 17:04:13 +00003279/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3280static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08003281 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003282{
Al Viro44c02a22017-10-05 12:59:44 -04003283 struct ifreq ifreq;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003284 u32 data32;
3285
Al Viro44c02a22017-10-05 12:59:44 -04003286 if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003287 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04003288 if (get_user(data32, &u_ifreq32->ifr_data))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003289 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04003290 ifreq.ifr_data = compat_ptr(data32);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003291
Al Viro44c02a22017-10-05 12:59:44 -04003292 return dev_ioctl(net, cmd, &ifreq, NULL);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003293}
3294
Johannes Berg37ac39b2019-01-25 22:43:18 +01003295static int compat_ifreq_ioctl(struct net *net, struct socket *sock,
3296 unsigned int cmd,
3297 struct compat_ifreq __user *uifr32)
3298{
3299 struct ifreq __user *uifr;
3300 int err;
3301
3302 /* Handle the fact that while struct ifreq has the same *layout* on
3303 * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
3304 * which are handled elsewhere, it still has different *size* due to
3305 * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
3306 * resulting in struct ifreq being 32 and 40 bytes respectively).
3307 * As a result, if the struct happens to be at the end of a page and
3308 * the next page isn't readable/writable, we get a fault. To prevent
3309 * that, copy back and forth to the full size.
3310 */
3311
3312 uifr = compat_alloc_user_space(sizeof(*uifr));
3313 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
3314 return -EFAULT;
3315
3316 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
3317
3318 if (!err) {
3319 switch (cmd) {
3320 case SIOCGIFFLAGS:
3321 case SIOCGIFMETRIC:
3322 case SIOCGIFMTU:
3323 case SIOCGIFMEM:
3324 case SIOCGIFHWADDR:
3325 case SIOCGIFINDEX:
3326 case SIOCGIFADDR:
3327 case SIOCGIFBRDADDR:
3328 case SIOCGIFDSTADDR:
3329 case SIOCGIFNETMASK:
3330 case SIOCGIFPFLAGS:
3331 case SIOCGIFTXQLEN:
3332 case SIOCGMIIPHY:
3333 case SIOCGMIIREG:
Johannes Bergc6c9fee2019-01-25 22:43:19 +01003334 case SIOCGIFNAME:
Johannes Berg37ac39b2019-01-25 22:43:18 +01003335 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
3336 err = -EFAULT;
3337 break;
3338 }
3339 }
3340 return err;
3341}
3342
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003343static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
3344 struct compat_ifreq __user *uifr32)
3345{
3346 struct ifreq ifr;
3347 struct compat_ifmap __user *uifmap32;
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003348 int err;
3349
3350 uifmap32 = &uifr32->ifr_ifru.ifru_map;
3351 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003352 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3353 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3354 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3355 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
3356 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
3357 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003358 if (err)
3359 return -EFAULT;
3360
Al Viro44c02a22017-10-05 12:59:44 -04003361 err = dev_ioctl(net, cmd, &ifr, NULL);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003362
3363 if (cmd == SIOCGIFMAP && !err) {
3364 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003365 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3366 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3367 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3368 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
3369 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
3370 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003371 if (err)
3372 err = -EFAULT;
3373 }
3374 return err;
3375}
3376
Arnd Bergmann7a229382009-11-06 23:00:29 -08003377struct rtentry32 {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003378 u32 rt_pad1;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003379 struct sockaddr rt_dst; /* target address */
3380 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3381 struct sockaddr rt_genmask; /* target network mask (IP) */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003382 unsigned short rt_flags;
3383 short rt_pad2;
3384 u32 rt_pad3;
3385 unsigned char rt_tos;
3386 unsigned char rt_class;
3387 short rt_pad4;
3388 short rt_metric; /* +1 for binary compatibility! */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003389 /* char * */ u32 rt_dev; /* forcing the device at add */
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003390 u32 rt_mtu; /* per route MTU/Window */
3391 u32 rt_window; /* Window clamping */
Arnd Bergmann7a229382009-11-06 23:00:29 -08003392 unsigned short rt_irtt; /* Initial RTT */
3393};
3394
3395struct in6_rtmsg32 {
3396 struct in6_addr rtmsg_dst;
3397 struct in6_addr rtmsg_src;
3398 struct in6_addr rtmsg_gateway;
3399 u32 rtmsg_type;
3400 u16 rtmsg_dst_len;
3401 u16 rtmsg_src_len;
3402 u32 rtmsg_metric;
3403 u32 rtmsg_info;
3404 u32 rtmsg_flags;
3405 s32 rtmsg_ifindex;
3406};
3407
Arnd Bergmann6b960182009-11-06 23:10:54 -08003408static int routing_ioctl(struct net *net, struct socket *sock,
3409 unsigned int cmd, void __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003410{
3411 int ret;
3412 void *r = NULL;
3413 struct in6_rtmsg r6;
3414 struct rtentry r4;
3415 char devname[16];
3416 u32 rtdev;
3417 mm_segment_t old_fs = get_fs();
3418
Arnd Bergmann6b960182009-11-06 23:10:54 -08003419 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3420 struct in6_rtmsg32 __user *ur6 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003421 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003422 3 * sizeof(struct in6_addr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003423 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3424 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3425 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3426 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3427 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3428 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3429 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003430
3431 r = (void *) &r6;
3432 } else { /* ipv4 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003433 struct rtentry32 __user *ur4 = argp;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003434 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
Arnd Bergmann7a229382009-11-06 23:00:29 -08003435 3 * sizeof(struct sockaddr));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003436 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3437 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3438 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3439 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3440 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3441 ret |= get_user(rtdev, &(ur4->rt_dev));
Arnd Bergmann7a229382009-11-06 23:00:29 -08003442 if (rtdev) {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003443 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
stephen hemmingerc3f52ae2011-02-23 09:06:48 +00003444 r4.rt_dev = (char __user __force *)devname;
3445 devname[15] = 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003446 } else
3447 r4.rt_dev = NULL;
3448
3449 r = (void *) &r4;
3450 }
3451
3452 if (ret) {
3453 ret = -EFAULT;
3454 goto out;
3455 }
3456
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003457 set_fs(KERNEL_DS);
Johannes Berg63ff03a2019-01-25 22:43:17 +01003458 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003459 set_fs(old_fs);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003460
3461out:
Arnd Bergmann7a229382009-11-06 23:00:29 -08003462 return ret;
3463}
3464
3465/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3466 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003467 * use compatible ioctls
Arnd Bergmann7a229382009-11-06 23:00:29 -08003468 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003469static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003470{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003471 compat_ulong_t tmp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003472
Arnd Bergmann6b960182009-11-06 23:10:54 -08003473 if (get_user(tmp, argp))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003474 return -EFAULT;
3475 if (tmp == BRCTL_GET_VERSION)
3476 return BRCTL_VERSION + 1;
3477 return -EINVAL;
3478}
3479
Arnd Bergmann6b960182009-11-06 23:10:54 -08003480static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3481 unsigned int cmd, unsigned long arg)
3482{
3483 void __user *argp = compat_ptr(arg);
3484 struct sock *sk = sock->sk;
3485 struct net *net = sock_net(sk);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003486
Arnd Bergmann6b960182009-11-06 23:10:54 -08003487 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003488 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003489
Arnd Bergmann6b960182009-11-06 23:10:54 -08003490 switch (cmd) {
3491 case SIOCSIFBR:
3492 case SIOCGIFBR:
3493 return old_bridge_ioctl(argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003494 case SIOCGIFCONF:
Al Viro36fd6332017-06-26 13:19:16 -04003495 return compat_dev_ifconf(net, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003496 case SIOCETHTOOL:
3497 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003498 case SIOCWANDEV:
3499 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003500 case SIOCGIFMAP:
3501 case SIOCSIFMAP:
3502 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003503 case SIOCADDRT:
3504 case SIOCDELRT:
3505 return routing_ioctl(net, sock, cmd, argp);
Arnd Bergmann0768e172019-04-17 22:56:11 +02003506 case SIOCGSTAMP_OLD:
3507 case SIOCGSTAMPNS_OLD:
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02003508 if (!sock->ops->gettstamp)
3509 return -ENOIOCTLCMD;
Arnd Bergmann0768e172019-04-17 22:56:11 +02003510 return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD,
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02003511 !COMPAT_USE_64BIT_TIME);
3512
Ben Hutchings590d4692013-11-18 17:04:13 +00003513 case SIOCBONDSLAVEINFOQUERY:
3514 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003515 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003516 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003517 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003518
Arnd Bergmann6b960182009-11-06 23:10:54 -08003519 case FIOSETOWN:
3520 case SIOCSPGRP:
3521 case FIOGETOWN:
3522 case SIOCGPGRP:
3523 case SIOCBRADDBR:
3524 case SIOCBRDELBR:
3525 case SIOCGIFVLAN:
3526 case SIOCSIFVLAN:
3527 case SIOCADDDLCI:
3528 case SIOCDELDLCI:
Andrey Vaginc62cce22016-10-24 18:29:13 -07003529 case SIOCGSKNS:
Arnd Bergmann0768e172019-04-17 22:56:11 +02003530 case SIOCGSTAMP_NEW:
3531 case SIOCGSTAMPNS_NEW:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003532 return sock_ioctl(file, cmd, arg);
3533
3534 case SIOCGIFFLAGS:
3535 case SIOCSIFFLAGS:
3536 case SIOCGIFMETRIC:
3537 case SIOCSIFMETRIC:
3538 case SIOCGIFMTU:
3539 case SIOCSIFMTU:
3540 case SIOCGIFMEM:
3541 case SIOCSIFMEM:
3542 case SIOCGIFHWADDR:
3543 case SIOCSIFHWADDR:
3544 case SIOCADDMULTI:
3545 case SIOCDELMULTI:
3546 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003547 case SIOCGIFADDR:
3548 case SIOCSIFADDR:
3549 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003550 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003551 case SIOCGIFBRDADDR:
3552 case SIOCSIFBRDADDR:
3553 case SIOCGIFDSTADDR:
3554 case SIOCSIFDSTADDR:
3555 case SIOCGIFNETMASK:
3556 case SIOCSIFNETMASK:
3557 case SIOCSIFPFLAGS:
3558 case SIOCGIFPFLAGS:
3559 case SIOCGIFTXQLEN:
3560 case SIOCSIFTXQLEN:
3561 case SIOCBRADDIF:
3562 case SIOCBRDELIF:
Johannes Bergc6c9fee2019-01-25 22:43:19 +01003563 case SIOCGIFNAME:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003564 case SIOCSIFNAME:
3565 case SIOCGMIIPHY:
3566 case SIOCGMIIREG:
3567 case SIOCSMIIREG:
Al Virof92d4fc2017-09-30 19:32:17 -04003568 case SIOCBONDENSLAVE:
3569 case SIOCBONDRELEASE:
3570 case SIOCBONDSETHWADDR:
3571 case SIOCBONDCHANGEACTIVE:
Johannes Berg37ac39b2019-01-25 22:43:18 +01003572 return compat_ifreq_ioctl(net, sock, cmd, argp);
3573
Arnd Bergmann6b960182009-11-06 23:10:54 -08003574 case SIOCSARP:
3575 case SIOCGARP:
3576 case SIOCDARP:
Arnd Bergmannc7dc5042019-06-03 23:07:12 +02003577 case SIOCOUTQ:
Arnd Bergmann9d7bf412019-06-03 23:06:00 +02003578 case SIOCOUTQNSD:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003579 case SIOCATMARK:
Johannes Berg63ff03a2019-01-25 22:43:17 +01003580 return sock_do_ioctl(net, sock, cmd, arg);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003581 }
3582
Arnd Bergmann6b960182009-11-06 23:10:54 -08003583 return -ENOIOCTLCMD;
3584}
Arnd Bergmann7a229382009-11-06 23:00:29 -08003585
Eric Dumazet95c96172012-04-15 05:58:06 +00003586static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003587 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003588{
3589 struct socket *sock = file->private_data;
3590 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003591 struct sock *sk;
3592 struct net *net;
3593
3594 sk = sock->sk;
3595 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003596
3597 if (sock->ops->compat_ioctl)
3598 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3599
David S. Miller87de87d2008-06-03 09:14:03 -07003600 if (ret == -ENOIOCTLCMD &&
3601 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3602 ret = compat_wext_handle_ioctl(net, cmd, arg);
3603
Arnd Bergmann6b960182009-11-06 23:10:54 -08003604 if (ret == -ENOIOCTLCMD)
3605 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3606
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003607 return ret;
3608}
3609#endif
3610
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003611/**
3612 * kernel_bind - bind an address to a socket (kernel space)
3613 * @sock: socket
3614 * @addr: address
3615 * @addrlen: length of address
3616 *
3617 * Returns 0 or an error.
3618 */
3619
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003620int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3621{
3622 return sock->ops->bind(sock, addr, addrlen);
3623}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003624EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003625
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003626/**
3627 * kernel_listen - move socket to listening state (kernel space)
3628 * @sock: socket
3629 * @backlog: pending connections queue size
3630 *
3631 * Returns 0 or an error.
3632 */
3633
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003634int kernel_listen(struct socket *sock, int backlog)
3635{
3636 return sock->ops->listen(sock, backlog);
3637}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003638EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003639
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003640/**
3641 * kernel_accept - accept a connection (kernel space)
3642 * @sock: listening socket
3643 * @newsock: new connected socket
3644 * @flags: flags
3645 *
3646 * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0.
3647 * If it fails, @newsock is guaranteed to be %NULL.
3648 * Returns 0 or an error.
3649 */
3650
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003651int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3652{
3653 struct sock *sk = sock->sk;
3654 int err;
3655
3656 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3657 newsock);
3658 if (err < 0)
3659 goto done;
3660
David Howellscdfbabf2017-03-09 08:09:05 +00003661 err = sock->ops->accept(sock, *newsock, flags, true);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003662 if (err < 0) {
3663 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003664 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003665 goto done;
3666 }
3667
3668 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003669 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003670
3671done:
3672 return err;
3673}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003674EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003675
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003676/**
3677 * kernel_connect - connect a socket (kernel space)
3678 * @sock: socket
3679 * @addr: address
3680 * @addrlen: address length
3681 * @flags: flags (O_NONBLOCK, ...)
3682 *
3683 * For datagram sockets, @addr is the addres to which datagrams are sent
3684 * by default, and the only address from which datagrams are received.
3685 * For stream sockets, attempts to connect to @addr.
3686 * Returns 0 or an error code.
3687 */
3688
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003689int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003690 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003691{
3692 return sock->ops->connect(sock, addr, addrlen, flags);
3693}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003694EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003695
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003696/**
3697 * kernel_getsockname - get the address which the socket is bound (kernel space)
3698 * @sock: socket
3699 * @addr: address holder
3700 *
3701 * Fills the @addr pointer with the address which the socket is bound.
3702 * Returns 0 or an error code.
3703 */
3704
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003705int kernel_getsockname(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003706{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003707 return sock->ops->getname(sock, addr, 0);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003708}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003709EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003710
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003711/**
3712 * kernel_peername - get the address which the socket is connected (kernel space)
3713 * @sock: socket
3714 * @addr: address holder
3715 *
3716 * Fills the @addr pointer with the address which the socket is connected.
3717 * Returns 0 or an error code.
3718 */
3719
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003720int kernel_getpeername(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003721{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003722 return sock->ops->getname(sock, addr, 1);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003723}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003724EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003725
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003726/**
3727 * kernel_getsockopt - get a socket option (kernel space)
3728 * @sock: socket
3729 * @level: API level (SOL_SOCKET, ...)
3730 * @optname: option tag
3731 * @optval: option value
3732 * @optlen: option length
3733 *
3734 * Assigns the option length to @optlen.
3735 * Returns 0 or an error.
3736 */
3737
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003738int kernel_getsockopt(struct socket *sock, int level, int optname,
3739 char *optval, int *optlen)
3740{
3741 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003742 char __user *uoptval;
3743 int __user *uoptlen;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003744 int err;
3745
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003746 uoptval = (char __user __force *) optval;
3747 uoptlen = (int __user __force *) optlen;
3748
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003749 set_fs(KERNEL_DS);
3750 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003751 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003752 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003753 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3754 uoptlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003755 set_fs(oldfs);
3756 return err;
3757}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003758EXPORT_SYMBOL(kernel_getsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003759
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003760/**
3761 * kernel_setsockopt - set a socket option (kernel space)
3762 * @sock: socket
3763 * @level: API level (SOL_SOCKET, ...)
3764 * @optname: option tag
3765 * @optval: option value
3766 * @optlen: option length
3767 *
3768 * Returns 0 or an error.
3769 */
3770
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003771int kernel_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07003772 char *optval, unsigned int optlen)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003773{
3774 mm_segment_t oldfs = get_fs();
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003775 char __user *uoptval;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003776 int err;
3777
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003778 uoptval = (char __user __force *) optval;
3779
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003780 set_fs(KERNEL_DS);
3781 if (level == SOL_SOCKET)
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003782 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003783 else
Namhyung Kimfb8621b2010-09-07 03:55:00 +00003784 err = sock->ops->setsockopt(sock, level, optname, uoptval,
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003785 optlen);
3786 set_fs(oldfs);
3787 return err;
3788}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003789EXPORT_SYMBOL(kernel_setsockopt);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003790
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003791/**
3792 * kernel_sendpage - send a &page through a socket (kernel space)
3793 * @sock: socket
3794 * @page: page
3795 * @offset: page offset
3796 * @size: total size in bytes
3797 * @flags: flags (MSG_DONTWAIT, ...)
3798 *
3799 * Returns the total amount sent in bytes or an error.
3800 */
3801
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003802int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3803 size_t size, int flags)
3804{
3805 if (sock->ops->sendpage)
3806 return sock->ops->sendpage(sock, page, offset, size, flags);
3807
3808 return sock_no_sendpage(sock, page, offset, size, flags);
3809}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003810EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003811
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003812/**
3813 * kernel_sendpage_locked - send a &page through the locked sock (kernel space)
3814 * @sk: sock
3815 * @page: page
3816 * @offset: page offset
3817 * @size: total size in bytes
3818 * @flags: flags (MSG_DONTWAIT, ...)
3819 *
3820 * Returns the total amount sent in bytes or an error.
3821 * Caller must hold @sk.
3822 */
3823
Tom Herbert306b13e2017-07-28 16:22:41 -07003824int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
3825 size_t size, int flags)
3826{
3827 struct socket *sock = sk->sk_socket;
3828
3829 if (sock->ops->sendpage_locked)
3830 return sock->ops->sendpage_locked(sk, page, offset, size,
3831 flags);
3832
3833 return sock_no_sendpage_locked(sk, page, offset, size, flags);
3834}
3835EXPORT_SYMBOL(kernel_sendpage_locked);
3836
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003837/**
3838 * kernel_shutdown - shut down part of a full-duplex connection (kernel space)
3839 * @sock: socket
3840 * @how: connection part
3841 *
3842 * Returns 0 or an error.
3843 */
3844
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003845int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3846{
3847 return sock->ops->shutdown(sock, how);
3848}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003849EXPORT_SYMBOL(kernel_sock_shutdown);
R. Parameswaran113c3072017-04-05 16:50:35 -07003850
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003851/**
3852 * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
3853 * @sk: socket
3854 *
3855 * This routine returns the IP overhead imposed by a socket i.e.
3856 * the length of the underlying IP header, depending on whether
3857 * this is an IPv4 or IPv6 socket and the length from IP options turned
3858 * on at the socket. Assumes that the caller has a lock on the socket.
R. Parameswaran113c3072017-04-05 16:50:35 -07003859 */
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003860
R. Parameswaran113c3072017-04-05 16:50:35 -07003861u32 kernel_sock_ip_overhead(struct sock *sk)
3862{
3863 struct inet_sock *inet;
3864 struct ip_options_rcu *opt;
3865 u32 overhead = 0;
R. Parameswaran113c3072017-04-05 16:50:35 -07003866#if IS_ENABLED(CONFIG_IPV6)
3867 struct ipv6_pinfo *np;
3868 struct ipv6_txoptions *optv6 = NULL;
3869#endif /* IS_ENABLED(CONFIG_IPV6) */
3870
3871 if (!sk)
3872 return overhead;
3873
R. Parameswaran113c3072017-04-05 16:50:35 -07003874 switch (sk->sk_family) {
3875 case AF_INET:
3876 inet = inet_sk(sk);
3877 overhead += sizeof(struct iphdr);
3878 opt = rcu_dereference_protected(inet->inet_opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003879 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003880 if (opt)
3881 overhead += opt->opt.optlen;
3882 return overhead;
3883#if IS_ENABLED(CONFIG_IPV6)
3884 case AF_INET6:
3885 np = inet6_sk(sk);
3886 overhead += sizeof(struct ipv6hdr);
3887 if (np)
3888 optv6 = rcu_dereference_protected(np->opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003889 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003890 if (optv6)
3891 overhead += (optv6->opt_flen + optv6->opt_nflen);
3892 return overhead;
3893#endif /* IS_ENABLED(CONFIG_IPV6) */
3894 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
3895 return overhead;
3896 }
3897}
3898EXPORT_SYMBOL(kernel_sock_ip_overhead);