blob: c76703c6f480328167f0d49162e1120c842b8236 [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
Jakub Kicinskicc698372020-11-20 14:50:52 -080055#include <linux/ethtool.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#include <linux/socket.h>
58#include <linux/file.h>
59#include <linux/net.h>
60#include <linux/interrupt.h>
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -070061#include <linux/thread_info.h>
Stephen Hemminger55737fd2006-09-01 00:23:39 -070062#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#include <linux/netdevice.h>
64#include <linux/proc_fs.h>
65#include <linux/seq_file.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080066#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#include <linux/if_bridge.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030068#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,
Christian Braunere65ce2a2021-01-21 14:19:27 +0100337 struct user_namespace *mnt_userns,
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100338 struct dentry *dentry, struct inode *inode,
339 const char *suffix, const void *value,
340 size_t size, int flags)
341{
342 /* Handled by LSM. */
343 return -EAGAIN;
344}
345
346static const struct xattr_handler sockfs_security_xattr_handler = {
347 .prefix = XATTR_SECURITY_PREFIX,
348 .set = sockfs_security_xattr_set,
349};
350
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200351static const struct xattr_handler *sockfs_xattr_handlers[] = {
352 &sockfs_xattr_handler,
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100353 &sockfs_security_xattr_handler,
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200354 NULL
355};
356
David Howellsfba9be42019-03-25 16:38:24 +0000357static int sockfs_init_fs_context(struct fs_context *fc)
Al Viroc74a1cb2011-01-12 16:59:34 -0500358{
David Howellsfba9be42019-03-25 16:38:24 +0000359 struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC);
360 if (!ctx)
361 return -ENOMEM;
362 ctx->ops = &sockfs_ops;
363 ctx->dops = &sockfs_dentry_operations;
364 ctx->xattr = sockfs_xattr_handlers;
365 return 0;
Al Viroc74a1cb2011-01-12 16:59:34 -0500366}
367
368static struct vfsmount *sock_mnt __read_mostly;
369
370static struct file_system_type sock_fs_type = {
371 .name = "sockfs",
David Howellsfba9be42019-03-25 16:38:24 +0000372 .init_fs_context = sockfs_init_fs_context,
Al Viroc74a1cb2011-01-12 16:59:34 -0500373 .kill_sb = kill_anon_super,
374};
375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376/*
377 * Obtains the first available file descriptor and sets it up for use.
378 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800379 * These functions create file structures and maps them to fd space
380 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 * and file struct implicitly stored in sock->file.
382 * Note that another thread may close file descriptor before we return
383 * from this function. We use the fact that now we do not refer
384 * to socket after mapping. If one day we will need it, this
385 * function will increment ref. count on file by 1.
386 *
387 * In any case returned fd MAY BE not valid!
388 * This race condition is unavoidable
389 * with shared fd spaces, we cannot solve it inside kernel,
390 * but we take care of internal coherence yet.
391 */
392
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300393/**
394 * sock_alloc_file - Bind a &socket to a &file
395 * @sock: socket
396 * @flags: file status flags
397 * @dname: protocol name
398 *
399 * Returns the &file bound with @sock, implicitly storing it
400 * in sock->file. If dname is %NULL, sets to "".
401 * On failure the return is a ERR pointer (see linux/err.h).
402 * This function uses GFP_KERNEL internally.
403 */
404
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700405struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406{
Al Viro7cbe66b2009-08-05 19:59:08 +0400407 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800408
Al Virod93aa9d2018-06-09 09:40:05 -0400409 if (!dname)
410 dname = sock->sk ? sock->sk->sk_prot_creator->name : "";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
Al Virod93aa9d2018-06-09 09:40:05 -0400412 file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname,
413 O_RDWR | (flags & O_NONBLOCK),
414 &socket_file_ops);
Viresh Kumarb5ffe632015-08-12 15:59:47 +0530415 if (IS_ERR(file)) {
Al Viro8e1611e2017-12-05 23:29:09 +0000416 sock_release(sock);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700417 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400418 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800419
420 sock->file = file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800421 file->private_data = sock;
Linus Torvaldsd8e464e2019-11-17 11:20:48 -0800422 stream_open(SOCK_INODE(sock), file);
Al Viro28407632012-08-17 23:54:15 -0400423 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800424}
Al Viro56b31d12012-08-18 00:25:51 -0400425EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800426
Al Viro56b31d12012-08-18 00:25:51 -0400427static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800428{
429 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400430 int fd = get_unused_fd_flags(flags);
Al Viroce4bb042018-01-10 18:47:05 -0500431 if (unlikely(fd < 0)) {
432 sock_release(sock);
Al Viro28407632012-08-17 23:54:15 -0400433 return fd;
Al Viroce4bb042018-01-10 18:47:05 -0500434 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800435
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700436 newfile = sock_alloc_file(sock, flags, NULL);
Enrico Weigelt4546e442019-06-05 22:58:50 +0200437 if (!IS_ERR(newfile)) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800438 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400439 return fd;
440 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400441
Al Viro28407632012-08-17 23:54:15 -0400442 put_unused_fd(fd);
443 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444}
445
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300446/**
447 * sock_from_file - Return the &socket bounded to @file.
448 * @file: file
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300449 *
Florent Revestdba4a922020-12-04 12:36:04 +0100450 * On failure returns %NULL.
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300451 */
452
Florent Revestdba4a922020-12-04 12:36:04 +0100453struct socket *sock_from_file(struct file *file)
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 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800459}
John Fastabend406a3c62012-07-20 10:39:25 +0000460EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800461
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700463 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 * @fd: file handle
465 * @err: pointer to an error code return
466 *
467 * The file handle passed in is locked and the socket it is bound
Rosen, Rami241c4662017-05-21 22:12:38 +0300468 * to is returned. If an error occurs the err pointer is overwritten
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 * with a negative errno code and NULL is returned. The function checks
470 * for both invalid handles and passing a handle which is not a socket.
471 *
472 * On a success the socket object pointer is returned.
473 */
474
475struct socket *sockfd_lookup(int fd, int *err)
476{
477 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 struct socket *sock;
479
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700480 file = fget(fd);
481 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 *err = -EBADF;
483 return NULL;
484 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700485
Florent Revestdba4a922020-12-04 12:36:04 +0100486 sock = sock_from_file(file);
487 if (!sock) {
488 *err = -ENOTSOCK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 fput(file);
Florent Revestdba4a922020-12-04 12:36:04 +0100490 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 return sock;
492}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700493EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800495static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
496{
Al Viro00e188e2014-03-03 23:48:18 -0500497 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800498 struct socket *sock;
499
Hua Zhong36725582006-04-19 15:25:02 -0700500 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500501 if (f.file) {
Florent Revestdba4a922020-12-04 12:36:04 +0100502 sock = sock_from_file(f.file);
Al Viro00e188e2014-03-03 23:48:18 -0500503 if (likely(sock)) {
Miaohe Lince787a52020-08-06 19:53:16 +0800504 *fput_needed = f.flags & FDPUT_FPUT;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800505 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500506 }
Florent Revestdba4a922020-12-04 12:36:04 +0100507 *err = -ENOTSOCK;
Al Viro00e188e2014-03-03 23:48:18 -0500508 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800509 }
510 return NULL;
511}
512
Masatake YAMATO600e1772012-08-29 10:44:29 +0000513static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
514 size_t size)
515{
516 ssize_t len;
517 ssize_t used = 0;
518
David Howellsc5ef6032015-03-17 22:26:16 +0000519 len = security_inode_listsecurity(d_inode(dentry), buffer, size);
Masatake YAMATO600e1772012-08-29 10:44:29 +0000520 if (len < 0)
521 return len;
522 used += len;
523 if (buffer) {
524 if (size < used)
525 return -ERANGE;
526 buffer += len;
527 }
528
529 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
530 used += len;
531 if (buffer) {
532 if (size < used)
533 return -ERANGE;
534 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
535 buffer += len;
536 }
537
538 return used;
539}
540
Tobias Klauserdc647ec2017-01-10 09:30:51 +0100541static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr)
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900542{
543 int err = simple_setattr(dentry, iattr);
544
Eric Biggerse1a3a602016-12-30 17:42:32 -0600545 if (!err && (iattr->ia_valid & ATTR_UID)) {
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900546 struct socket *sock = SOCKET_I(d_inode(dentry));
547
Cong Wang6d8c50d2018-06-07 13:39:49 -0700548 if (sock->sk)
549 sock->sk->sk_uid = iattr->ia_uid;
550 else
551 err = -ENOENT;
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900552 }
553
554 return err;
555}
556
Masatake YAMATO600e1772012-08-29 10:44:29 +0000557static const struct inode_operations sockfs_inode_ops = {
Masatake YAMATO600e1772012-08-29 10:44:29 +0000558 .listxattr = sockfs_listxattr,
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900559 .setattr = sockfs_setattr,
Masatake YAMATO600e1772012-08-29 10:44:29 +0000560};
561
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300563 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700564 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 * Allocate a new inode and socket object. The two are bound together
566 * and initialised. The socket is then returned. If we are out of inodes
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300567 * NULL is returned. This functions uses GFP_KERNEL internally.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 */
569
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800570struct socket *sock_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700572 struct inode *inode;
573 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200575 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 if (!inode)
577 return NULL;
578
579 sock = SOCKET_I(inode);
580
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400581 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700582 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100583 inode->i_uid = current_fsuid();
584 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000585 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 return sock;
588}
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800589EXPORT_SYMBOL(sock_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590
Cong Wang6d8c50d2018-06-07 13:39:49 -0700591static void __sock_release(struct socket *sock, struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592{
593 if (sock->ops) {
594 struct module *owner = sock->ops->owner;
595
Cong Wang6d8c50d2018-06-07 13:39:49 -0700596 if (inode)
597 inode_lock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 sock->ops->release(sock);
Eric Biggersff7b11a2019-02-21 14:13:56 -0800599 sock->sk = NULL;
Cong Wang6d8c50d2018-06-07 13:39:49 -0700600 if (inode)
601 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 sock->ops = NULL;
603 module_put(owner);
604 }
605
Al Viro333f7902019-07-05 20:14:16 +0100606 if (sock->wq.fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800607 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 if (!sock->file) {
610 iput(SOCK_INODE(sock));
611 return;
612 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700613 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614}
Cong Wang6d8c50d2018-06-07 13:39:49 -0700615
Andrew Lunn9a8ad9a2020-07-13 01:15:12 +0200616/**
617 * sock_release - close a socket
618 * @sock: socket to close
619 *
620 * The socket is released from the protocol stack if it has a release
621 * callback, and the inode is then released if the socket is bound to
622 * an inode not a file.
623 */
Cong Wang6d8c50d2018-06-07 13:39:49 -0700624void sock_release(struct socket *sock)
625{
626 __sock_release(sock, NULL);
627}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700628EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400630void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000631{
Eric Dumazet140c55d2014-08-06 11:49:29 +0200632 u8 flags = *tx_flags;
633
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400634 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200635 flags |= SKBTX_HW_TSTAMP;
636
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400637 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200638 flags |= SKBTX_SW_TSTAMP;
639
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400640 if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200641 flags |= SKBTX_SCHED_TSTAMP;
642
Eric Dumazet140c55d2014-08-06 11:49:29 +0200643 *tx_flags = flags;
Patrick Ohly20d49472009-02-12 05:03:38 +0000644}
Willem de Bruijn67cc0d42014-09-08 19:58:58 -0400645EXPORT_SYMBOL(__sock_tx_timestamp);
Patrick Ohly20d49472009-02-12 05:03:38 +0000646
Paolo Abeni8c3c4472019-05-03 17:01:39 +0200647INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *,
648 size_t));
Paolo Abenia648a592019-07-03 16:06:54 +0200649INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *,
650 size_t));
Al Virod8725c82014-12-11 00:02:50 -0500651static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652{
Paolo Abenia648a592019-07-03 16:06:54 +0200653 int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg,
654 inet_sendmsg, sock, msg,
655 msg_data_left(msg));
Al Virod8725c82014-12-11 00:02:50 -0500656 BUG_ON(ret == -EIOCBQUEUED);
657 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658}
Gu Zheng0cf00c62014-12-05 15:14:23 +0800659
Randy Dunlap85806af2019-05-18 21:23:07 -0700660/**
661 * sock_sendmsg - send a message through @sock
662 * @sock: socket
663 * @msg: message to send
664 *
665 * Sends @msg through @sock, passing through LSM.
666 * Returns the number of bytes sent, or an error code.
667 */
Al Virod8725c82014-12-11 00:02:50 -0500668int sock_sendmsg(struct socket *sock, struct msghdr *msg)
Gu Zheng0cf00c62014-12-05 15:14:23 +0800669{
Al Virod8725c82014-12-11 00:02:50 -0500670 int err = security_socket_sendmsg(sock, msg,
Al Viro01e97e62014-12-15 21:39:31 -0500671 msg_data_left(msg));
Ying Xue1b784142015-03-02 15:37:48 +0800672
Al Virod8725c82014-12-11 00:02:50 -0500673 return err ?: sock_sendmsg_nosec(sock, msg);
Gu Zheng0cf00c62014-12-05 15:14:23 +0800674}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700675EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300677/**
678 * kernel_sendmsg - send a message through @sock (kernel-space)
679 * @sock: socket
680 * @msg: message header
681 * @vec: kernel vec
682 * @num: vec array length
683 * @size: total message data size
684 *
685 * Builds the message data with @vec and sends it through @sock.
686 * Returns the number of bytes sent, or an error code.
687 */
688
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
690 struct kvec *vec, size_t num, size_t size)
691{
David Howellsaa563d72018-10-20 00:57:56 +0100692 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Al Virod8725c82014-12-11 00:02:50 -0500693 return sock_sendmsg(sock, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700695EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300697/**
698 * kernel_sendmsg_locked - send a message through @sock (kernel-space)
699 * @sk: sock
700 * @msg: message header
701 * @vec: output s/g array
702 * @num: output s/g array length
703 * @size: total message data size
704 *
705 * Builds the message data with @vec and sends it through @sock.
706 * Returns the number of bytes sent, or an error code.
707 * Caller must hold @sk.
708 */
709
Tom Herbert306b13e2017-07-28 16:22:41 -0700710int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
711 struct kvec *vec, size_t num, size_t size)
712{
713 struct socket *sock = sk->sk_socket;
714
715 if (!sock->ops->sendmsg_locked)
John Fastabenddb5980d2017-08-15 22:31:34 -0700716 return sock_no_sendmsg_locked(sk, msg, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700717
David Howellsaa563d72018-10-20 00:57:56 +0100718 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700719
720 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
721}
722EXPORT_SYMBOL(kernel_sendmsg_locked);
723
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400724static bool skb_is_err_queue(const struct sk_buff *skb)
725{
726 /* pkt_type of skbs enqueued on the error queue are set to
727 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
728 * in recvmsg, since skbs received on a local socket will never
729 * have a pkt_type of PACKET_OUTGOING.
730 */
731 return skb->pkt_type == PACKET_OUTGOING;
732}
733
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200734/* On transmit, software and hardware timestamps are returned independently.
735 * As the two skb clones share the hardware timestamp, which may be updated
736 * before the software timestamp is received, a hardware TX timestamp may be
737 * returned only if there is no software TX timestamp. Ignore false software
738 * timestamps, which may be made in the __sock_recv_timestamp() call when the
Deepa Dinamani7f1bc6e2019-02-02 07:34:46 -0800739 * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200740 * hardware timestamp.
741 */
742static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
743{
744 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb);
745}
746
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200747static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb)
748{
749 struct scm_ts_pktinfo ts_pktinfo;
750 struct net_device *orig_dev;
751
752 if (!skb_mac_header_was_set(skb))
753 return;
754
755 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo));
756
757 rcu_read_lock();
758 orig_dev = dev_get_by_napi_id(skb_napi_id(skb));
759 if (orig_dev)
760 ts_pktinfo.if_index = orig_dev->ifindex;
761 rcu_read_unlock();
762
763 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb);
764 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
765 sizeof(ts_pktinfo), &ts_pktinfo);
766}
767
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700768/*
769 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
770 */
771void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
772 struct sk_buff *skb)
773{
Patrick Ohly20d49472009-02-12 05:03:38 +0000774 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Deepa Dinamani887feae2019-02-02 07:34:50 -0800775 int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW);
Deepa Dinamani97184752019-02-02 07:34:51 -0800776 struct scm_timestamping_internal tss;
777
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200778 int empty = 1, false_tstamp = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000779 struct skb_shared_hwtstamps *shhwtstamps =
780 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700781
Patrick Ohly20d49472009-02-12 05:03:38 +0000782 /* Race occurred between timestamp enabling and packet
783 receiving. Fill in the current time for now. */
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200784 if (need_software_tstamp && skb->tstamp == 0) {
Patrick Ohly20d49472009-02-12 05:03:38 +0000785 __net_timestamp(skb);
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200786 false_tstamp = 1;
787 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000788
789 if (need_software_tstamp) {
790 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800791 if (new_tstamp) {
792 struct __kernel_sock_timeval tv;
793
794 skb_get_new_timestamp(skb, &tv);
795 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
796 sizeof(tv), &tv);
797 } else {
798 struct __kernel_old_timeval tv;
799
800 skb_get_timestamp(skb, &tv);
801 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
802 sizeof(tv), &tv);
803 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000804 } else {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800805 if (new_tstamp) {
806 struct __kernel_timespec ts;
807
808 skb_get_new_timestampns(skb, &ts);
809 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
810 sizeof(ts), &ts);
811 } else {
Arnd Bergmanndf1b4ba2019-10-25 22:04:46 +0200812 struct __kernel_old_timespec ts;
Deepa Dinamani887feae2019-02-02 07:34:50 -0800813
814 skb_get_timestampns(skb, &ts);
815 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
816 sizeof(ts), &ts);
817 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000818 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700819 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000820
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400821 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400822 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Deepa Dinamani97184752019-02-02 07:34:51 -0800823 ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000824 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400825 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400826 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200827 !skb_is_swtx_tstamp(skb, false_tstamp) &&
Deepa Dinamani97184752019-02-02 07:34:51 -0800828 ktime_to_timespec64_cond(shhwtstamps->hwtstamp, tss.ts + 2)) {
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400829 empty = 0;
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200830 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&
831 !skb_is_err_queue(skb))
832 put_ts_pktinfo(msg, skb);
833 }
Francis Yan1c885802016-11-27 23:07:18 -0800834 if (!empty) {
Deepa Dinamani97184752019-02-02 07:34:51 -0800835 if (sock_flag(sk, SOCK_TSTAMP_NEW))
836 put_cmsg_scm_timestamping64(msg, &tss);
837 else
838 put_cmsg_scm_timestamping(msg, &tss);
Francis Yan1c885802016-11-27 23:07:18 -0800839
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400840 if (skb_is_err_queue(skb) && skb->len &&
Soheil Hassas Yeganeh4ef1b282017-03-18 17:03:00 -0400841 SKB_EXT_ERR(skb)->opt_stats)
Francis Yan1c885802016-11-27 23:07:18 -0800842 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
843 skb->len, skb->data);
844 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700845}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300846EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
847
Johannes Berg6e3e9392011-11-09 10:15:42 +0100848void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
849 struct sk_buff *skb)
850{
851 int ack;
852
853 if (!sock_flag(sk, SOCK_WIFI_STATUS))
854 return;
855 if (!skb->wifi_acked_valid)
856 return;
857
858 ack = skb->wifi_acked;
859
860 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
861}
862EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
863
stephen hemminger11165f12010-10-18 14:27:29 +0000864static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
865 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700866{
Eyal Birger744d5a32015-03-01 14:58:31 +0200867 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
Neil Horman3b885782009-10-12 13:26:31 -0700868 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
Eyal Birger744d5a32015-03-01 14:58:31 +0200869 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
Neil Horman3b885782009-10-12 13:26:31 -0700870}
871
Eric Dumazet767dd032010-04-28 19:14:43 +0000872void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700873 struct sk_buff *skb)
874{
875 sock_recv_timestamp(msg, sk, skb);
876 sock_recv_drops(msg, sk, skb);
877}
Eric Dumazet767dd032010-04-28 19:14:43 +0000878EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700879
Paolo Abeni8c3c4472019-05-03 17:01:39 +0200880INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *,
Paolo Abenia648a592019-07-03 16:06:54 +0200881 size_t, int));
882INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *,
883 size_t, int));
Ying Xue1b784142015-03-02 15:37:48 +0800884static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
Al Viro2da62902015-03-14 21:13:46 -0400885 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886{
Paolo Abenia648a592019-07-03 16:06:54 +0200887 return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg,
888 inet_recvmsg, sock, msg, msg_data_left(msg),
889 flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890}
891
Randy Dunlap85806af2019-05-18 21:23:07 -0700892/**
893 * sock_recvmsg - receive a message from @sock
894 * @sock: socket
895 * @msg: message to receive
896 * @flags: message flags
897 *
898 * Receives @msg from @sock, passing through LSM. Returns the total number
899 * of bytes received, or an error.
900 */
Al Viro2da62902015-03-14 21:13:46 -0400901int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700902{
Al Viro2da62902015-03-14 21:13:46 -0400903 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700904
Al Viro2da62902015-03-14 21:13:46 -0400905 return err ?: sock_recvmsg_nosec(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700907EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000909/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300910 * kernel_recvmsg - Receive a message from a socket (kernel space)
911 * @sock: The socket to receive the message from
912 * @msg: Received message
913 * @vec: Input s/g array for message data
914 * @num: Size of input s/g array
915 * @size: Number of bytes to read
916 * @flags: Message flags (MSG_DONTWAIT, etc...)
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000917 *
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300918 * On return the msg structure contains the scatter/gather array passed in the
919 * vec argument. The array is modified so that it consists of the unfilled
920 * portion of the original array.
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000921 *
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300922 * The returned value is the total number of bytes received, or an error.
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000923 */
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300924
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700925int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
926 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927{
Christoph Hellwig1f466e12020-05-11 13:59:13 +0200928 msg->msg_control_is_user = false;
David Howellsaa563d72018-10-20 00:57:56 +0100929 iov_iter_kvec(&msg->msg_iter, READ, vec, num, size);
Christoph Hellwig1f466e12020-05-11 13:59:13 +0200930 return sock_recvmsg(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700932EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300934static ssize_t sock_sendpage(struct file *file, struct page *page,
935 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936{
937 struct socket *sock;
938 int flags;
939
Eric Dumazetb69aee02005-09-06 14:42:45 -0700940 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
Eric Dumazet35f9c092012-04-05 03:05:35 +0000942 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
943 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
944 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
Linus Torvaldse6949582009-08-13 08:28:36 -0700946 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947}
948
Jens Axboe9c55e012007-11-06 23:30:13 -0800949static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700950 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800951 unsigned int flags)
952{
953 struct socket *sock = file->private_data;
954
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800955 if (unlikely(!sock->ops->splice_read))
Slavomir Kaslev95506582018-11-16 11:27:53 +0200956 return generic_file_splice_read(file, ppos, pipe, len, flags);
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800957
Jens Axboe9c55e012007-11-06 23:30:13 -0800958 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
959}
960
Al Viro8ae5e0302014-11-28 19:40:50 -0500961static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800962{
Al Viro6d652332015-01-30 16:12:56 -0500963 struct file *file = iocb->ki_filp;
964 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700965 struct msghdr msg = {.msg_iter = *to,
966 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -0500967 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800968
Jens Axboeebfcd892019-12-09 20:58:56 -0700969 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
Al Viro8ae5e0302014-11-28 19:40:50 -0500970 msg.msg_flags = MSG_DONTWAIT;
971
972 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800973 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700974
Christoph Hellwig66ee59a2015-02-11 19:56:46 +0100975 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800976 return 0;
977
Al Viro2da62902015-03-14 21:13:46 -0400978 res = sock_recvmsg(sock, &msg, msg.msg_flags);
Al Viro8ae5e0302014-11-28 19:40:50 -0500979 *to = msg.msg_iter;
980 return res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800981}
982
Al Viro8ae5e0302014-11-28 19:40:50 -0500983static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984{
Al Viro6d652332015-01-30 16:12:56 -0500985 struct file *file = iocb->ki_filp;
986 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700987 struct msghdr msg = {.msg_iter = *from,
988 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -0500989 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800990
Al Viro8ae5e0302014-11-28 19:40:50 -0500991 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800992 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700993
Jens Axboeebfcd892019-12-09 20:58:56 -0700994 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
Al Viro8ae5e0302014-11-28 19:40:50 -0500995 msg.msg_flags = MSG_DONTWAIT;
996
Al Viro6d652332015-01-30 16:12:56 -0500997 if (sock->type == SOCK_SEQPACKET)
998 msg.msg_flags |= MSG_EOR;
999
Al Virod8725c82014-12-11 00:02:50 -05001000 res = sock_sendmsg(sock, &msg);
Al Viro8ae5e0302014-11-28 19:40:50 -05001001 *from = msg.msg_iter;
1002 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003}
1004
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005/*
1006 * Atomic setting of ioctl hooks to avoid race
1007 * with module unload.
1008 */
1009
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001010static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001011static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
Eric W. Biederman881d9662007-09-17 11:56:21 -07001013void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001015 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001017 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018}
1019EXPORT_SYMBOL(brioctl_set);
1020
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001021static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -07001022static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023
Eric W. Biederman881d9662007-09-17 11:56:21 -07001024void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001026 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001028 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029}
1030EXPORT_SYMBOL(vlan_ioctl_set);
1031
Arnd Bergmann6b960182009-11-06 23:10:54 -08001032static long sock_do_ioctl(struct net *net, struct socket *sock,
Johannes Berg63ff03a2019-01-25 22:43:17 +01001033 unsigned int cmd, unsigned long arg)
Arnd Bergmann6b960182009-11-06 23:10:54 -08001034{
1035 int err;
1036 void __user *argp = (void __user *)arg;
1037
1038 err = sock->ops->ioctl(sock, cmd, arg);
1039
1040 /*
1041 * If this ioctl is unknown try to hand it down
1042 * to the NIC driver.
1043 */
Al Viro36fd6332017-06-26 13:19:16 -04001044 if (err != -ENOIOCTLCMD)
1045 return err;
Arnd Bergmann6b960182009-11-06 23:10:54 -08001046
Al Viro36fd6332017-06-26 13:19:16 -04001047 if (cmd == SIOCGIFCONF) {
1048 struct ifconf ifc;
1049 if (copy_from_user(&ifc, argp, sizeof(struct ifconf)))
1050 return -EFAULT;
1051 rtnl_lock();
1052 err = dev_ifconf(net, &ifc, sizeof(struct ifreq));
1053 rtnl_unlock();
1054 if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf)))
1055 err = -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04001056 } else {
1057 struct ifreq ifr;
1058 bool need_copyout;
Johannes Berg63ff03a2019-01-25 22:43:17 +01001059 if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
Al Viro44c02a22017-10-05 12:59:44 -04001060 return -EFAULT;
1061 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
1062 if (!err && need_copyout)
Johannes Berg63ff03a2019-01-25 22:43:17 +01001063 if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
Al Viro44c02a22017-10-05 12:59:44 -04001064 return -EFAULT;
Al Viro36fd6332017-06-26 13:19:16 -04001065 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08001066 return err;
1067}
1068
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069/*
1070 * With an ioctl, arg may well be a user mode pointer, but we don't know
1071 * what to do with it - that's up to the protocol still.
1072 */
1073
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001074/**
1075 * get_net_ns - increment the refcount of the network namespace
1076 * @ns: common namespace (net)
1077 *
1078 * Returns the net's common namespace.
1079 */
1080
Kirill Tkhaid8d211a2018-02-14 16:39:56 +03001081struct ns_common *get_net_ns(struct ns_common *ns)
Andrey Vaginc62cce22016-10-24 18:29:13 -07001082{
1083 return &get_net(container_of(ns, struct net, ns))->ns;
1084}
Kirill Tkhaid8d211a2018-02-14 16:39:56 +03001085EXPORT_SYMBOL_GPL(get_net_ns);
Andrey Vaginc62cce22016-10-24 18:29:13 -07001086
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1088{
1089 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001090 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 void __user *argp = (void __user *)arg;
1092 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001093 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094
Eric Dumazetb69aee02005-09-06 14:42:45 -07001095 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001096 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001097 net = sock_net(sk);
Al Viro44c02a22017-10-05 12:59:44 -04001098 if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
1099 struct ifreq ifr;
1100 bool need_copyout;
1101 if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
1102 return -EFAULT;
1103 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
1104 if (!err && need_copyout)
1105 if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
1106 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001108#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Al Virob1b0c242017-10-01 20:13:08 -04001110 err = wext_handle_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001112#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001113 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 case FIOSETOWN:
1115 case SIOCSPGRP:
1116 err = -EFAULT;
1117 if (get_user(pid, (int __user *)argp))
1118 break;
Jiri Slaby393cc3f2017-06-13 13:35:50 +02001119 err = f_setown(sock->file, pid, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 break;
1121 case FIOGETOWN:
1122 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001123 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001124 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 break;
1126 case SIOCGIFBR:
1127 case SIOCSIFBR:
1128 case SIOCBRADDBR:
1129 case SIOCBRDELBR:
1130 err = -ENOPKG;
1131 if (!br_ioctl_hook)
1132 request_module("bridge");
1133
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001134 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001135 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001136 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001137 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 break;
1139 case SIOCGIFVLAN:
1140 case SIOCSIFVLAN:
1141 err = -ENOPKG;
1142 if (!vlan_ioctl_hook)
1143 request_module("8021q");
1144
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001145 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001147 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001148 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 break;
Andrey Vaginc62cce22016-10-24 18:29:13 -07001150 case SIOCGSKNS:
1151 err = -EPERM;
1152 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1153 break;
1154
1155 err = open_related_ns(&net->ns, get_net_ns);
1156 break;
Arnd Bergmann0768e172019-04-17 22:56:11 +02001157 case SIOCGSTAMP_OLD:
1158 case SIOCGSTAMPNS_OLD:
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02001159 if (!sock->ops->gettstamp) {
1160 err = -ENOIOCTLCMD;
1161 break;
1162 }
1163 err = sock->ops->gettstamp(sock, argp,
Arnd Bergmann0768e172019-04-17 22:56:11 +02001164 cmd == SIOCGSTAMP_OLD,
1165 !IS_ENABLED(CONFIG_64BIT));
Gustavo A. R. Silva60747822019-04-24 10:31:24 -05001166 break;
Arnd Bergmann0768e172019-04-17 22:56:11 +02001167 case SIOCGSTAMP_NEW:
1168 case SIOCGSTAMPNS_NEW:
1169 if (!sock->ops->gettstamp) {
1170 err = -ENOIOCTLCMD;
1171 break;
1172 }
1173 err = sock->ops->gettstamp(sock, argp,
1174 cmd == SIOCGSTAMP_NEW,
1175 false);
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02001176 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 default:
Johannes Berg63ff03a2019-01-25 22:43:17 +01001178 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001180 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 return err;
1182}
1183
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001184/**
1185 * sock_create_lite - creates a socket
1186 * @family: protocol family (AF_INET, ...)
1187 * @type: communication type (SOCK_STREAM, ...)
1188 * @protocol: protocol (0, ...)
1189 * @res: new socket
1190 *
1191 * Creates a new socket and assigns it to @res, passing through LSM.
1192 * The new socket initialization is not complete, see kernel_accept().
1193 * Returns 0 or an error. On failure @res is set to %NULL.
1194 * This function internally uses GFP_KERNEL.
1195 */
1196
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197int sock_create_lite(int family, int type, int protocol, struct socket **res)
1198{
1199 int err;
1200 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001201
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 err = security_socket_create(family, type, protocol, 1);
1203 if (err)
1204 goto out;
1205
1206 sock = sock_alloc();
1207 if (!sock) {
1208 err = -ENOMEM;
1209 goto out;
1210 }
1211
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001213 err = security_socket_post_create(sock, family, type, protocol, 1);
1214 if (err)
1215 goto out_release;
1216
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217out:
1218 *res = sock;
1219 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001220out_release:
1221 sock_release(sock);
1222 sock = NULL;
1223 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001225EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226
1227/* No kernel lock held - perfect */
Al Viroade994f2017-07-03 00:01:49 -04001228static __poll_t sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229{
Christoph Hellwig3cafb372018-01-09 16:07:34 +01001230 struct socket *sock = file->private_data;
Christoph Hellwiga331de32018-07-30 09:42:13 +02001231 __poll_t events = poll_requested_events(wait), flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232
Christoph Hellwige88958e2018-06-29 15:37:24 +02001233 if (!sock->ops->poll)
1234 return 0;
Christoph Hellwigf641f13b2018-07-30 09:42:12 +02001235
Christoph Hellwiga331de32018-07-30 09:42:13 +02001236 if (sk_can_busy_loop(sock->sk)) {
1237 /* poll once if requested by the syscall */
1238 if (events & POLL_BUSY_LOOP)
1239 sk_busy_loop(sock->sk, 1);
1240
1241 /* if this socket can poll_ll, tell the system call */
1242 flag = POLL_BUSY_LOOP;
1243 }
1244
1245 return sock->ops->poll(file, sock, wait) | flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246}
1247
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001248static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001250 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251
1252 return sock->ops->mmap(file, sock, vma);
1253}
1254
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001255static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256{
Cong Wang6d8c50d2018-06-07 13:39:49 -07001257 __sock_release(SOCKET_I(inode), inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 return 0;
1259}
1260
1261/*
1262 * Update the socket async list
1263 *
1264 * Fasync_list locking strategy.
1265 *
1266 * 1. fasync_list is modified only under process context socket lock
1267 * i.e. under semaphore.
1268 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001269 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 */
1271
1272static int sock_fasync(int fd, struct file *filp, int on)
1273{
Eric Dumazet989a2972010-04-14 09:55:35 +00001274 struct socket *sock = filp->private_data;
1275 struct sock *sk = sock->sk;
Al Viro333f7902019-07-05 20:14:16 +01001276 struct socket_wq *wq = &sock->wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277
Eric Dumazet989a2972010-04-14 09:55:35 +00001278 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280
1281 lock_sock(sk);
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001282 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001284 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001285 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001286 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001287 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288
Eric Dumazet989a2972010-04-14 09:55:35 +00001289 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 return 0;
1291}
1292
Eric Dumazetceb5d582015-11-29 20:03:11 -08001293/* This function may be called only under rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294
Eric Dumazetceb5d582015-11-29 20:03:11 -08001295int sock_wake_async(struct socket_wq *wq, int how, int band)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296{
Eric Dumazetceb5d582015-11-29 20:03:11 -08001297 if (!wq || !wq->fasync_list)
1298 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001299
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001300 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001301 case SOCK_WAKE_WAITD:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001302 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 break;
1304 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001305 case SOCK_WAKE_SPACE:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001306 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 break;
Miaohe Lin7c7ab582020-08-08 16:23:10 +08001308 fallthrough;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001309 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001310call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001311 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001313 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001314 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08001316
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 return 0;
1318}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001319EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001321/**
1322 * __sock_create - creates a socket
1323 * @net: net namespace
1324 * @family: protocol family (AF_INET, ...)
1325 * @type: communication type (SOCK_STREAM, ...)
1326 * @protocol: protocol (0, ...)
1327 * @res: new socket
1328 * @kern: boolean for kernel space sockets
1329 *
1330 * Creates a new socket and assigns it to @res, passing through LSM.
1331 * Returns 0 or an error. On failure @res is set to %NULL. @kern must
1332 * be set to true if the socket resides in kernel space.
1333 * This function internally uses GFP_KERNEL.
1334 */
1335
Pavel Emelyanov721db932010-09-29 16:06:32 +04001336int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001337 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338{
1339 int err;
1340 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001341 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342
1343 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001344 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 */
1346 if (family < 0 || family >= NPROTO)
1347 return -EAFNOSUPPORT;
1348 if (type < 0 || type >= SOCK_MAX)
1349 return -EINVAL;
1350
1351 /* Compatibility.
1352
1353 This uglymoron is moved from INET layer to here to avoid
1354 deadlock in module load.
1355 */
1356 if (family == PF_INET && type == SOCK_PACKET) {
liping.zhangf3c98692016-03-11 23:08:36 +08001357 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1358 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 family = PF_PACKET;
1360 }
1361
1362 err = security_socket_create(family, type, protocol, kern);
1363 if (err)
1364 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001365
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001366 /*
1367 * Allocate the socket and allow the family to set things up. if
1368 * the protocol is 0, the family is instructed to select an appropriate
1369 * default.
1370 */
1371 sock = sock_alloc();
1372 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001373 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001374 return -ENFILE; /* Not exactly a match, but its the
1375 closest posix thing */
1376 }
1377
1378 sock->type = type;
1379
Johannes Berg95a5afc2008-10-16 15:24:51 -07001380#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001381 /* Attempt to load a protocol module if the find failed.
1382 *
1383 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 * requested real, full-featured networking support upon configuration.
1385 * Otherwise module support will break!
1386 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001387 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001388 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389#endif
1390
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001391 rcu_read_lock();
1392 pf = rcu_dereference(net_families[family]);
1393 err = -EAFNOSUPPORT;
1394 if (!pf)
1395 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396
1397 /*
1398 * We will call the ->create function, that possibly is in a loadable
1399 * module, so we have to bump that loadable module refcnt first.
1400 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001401 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 goto out_release;
1403
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001404 /* Now protected by module ref count */
1405 rcu_read_unlock();
1406
Eric Paris3f378b62009-11-05 22:18:14 -08001407 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001408 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001410
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 /*
1412 * Now to bump the refcnt of the [loadable] module that owns this
1413 * socket at sock_release time we decrement its refcnt.
1414 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001415 if (!try_module_get(sock->ops->owner))
1416 goto out_module_busy;
1417
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 /*
1419 * Now that we're done with the ->create function, the [loadable]
1420 * module can have its refcnt decremented
1421 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001422 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001423 err = security_socket_post_create(sock, family, type, protocol, kern);
1424 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001425 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001426 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001428 return 0;
1429
1430out_module_busy:
1431 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001433 sock->ops = NULL;
1434 module_put(pf->owner);
1435out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001437 return err;
1438
1439out_release:
1440 rcu_read_unlock();
1441 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001443EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001445/**
1446 * sock_create - creates a socket
1447 * @family: protocol family (AF_INET, ...)
1448 * @type: communication type (SOCK_STREAM, ...)
1449 * @protocol: protocol (0, ...)
1450 * @res: new socket
1451 *
1452 * A wrapper around __sock_create().
1453 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1454 */
1455
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456int sock_create(int family, int type, int protocol, struct socket **res)
1457{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001458 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001460EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001462/**
1463 * sock_create_kern - creates a socket (kernel space)
1464 * @net: net namespace
1465 * @family: protocol family (AF_INET, ...)
1466 * @type: communication type (SOCK_STREAM, ...)
1467 * @protocol: protocol (0, ...)
1468 * @res: new socket
1469 *
1470 * A wrapper around __sock_create().
1471 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1472 */
1473
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001474int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475{
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001476 return __sock_create(net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001478EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001480int __sys_socket(int family, int type, int protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481{
1482 int retval;
1483 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001484 int flags;
1485
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001486 /* Check the SOCK_* constants for consistency. */
1487 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1488 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1489 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1490 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1491
Ulrich Dreppera677a032008-07-23 21:29:17 -07001492 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001493 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001494 return -EINVAL;
1495 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001497 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1498 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1499
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 retval = sock_create(family, type, protocol, &sock);
1501 if (retval < 0)
Al Viro8e1611e2017-12-05 23:29:09 +00001502 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503
Al Viro8e1611e2017-12-05 23:29:09 +00001504 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505}
1506
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001507SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1508{
1509 return __sys_socket(family, type, protocol);
1510}
1511
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512/*
1513 * Create a pair of connected sockets.
1514 */
1515
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001516int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517{
1518 struct socket *sock1, *sock2;
1519 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001520 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001521 int flags;
1522
1523 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001524 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001525 return -EINVAL;
1526 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001528 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1529 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1530
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 /*
Al Viro016a2662017-12-05 23:28:38 +00001532 * reserve descriptors and make sure we won't fail
1533 * to return them to userland.
1534 */
1535 fd1 = get_unused_fd_flags(flags);
1536 if (unlikely(fd1 < 0))
1537 return fd1;
1538
1539 fd2 = get_unused_fd_flags(flags);
1540 if (unlikely(fd2 < 0)) {
1541 put_unused_fd(fd1);
1542 return fd2;
1543 }
1544
1545 err = put_user(fd1, &usockvec[0]);
1546 if (err)
1547 goto out;
1548
1549 err = put_user(fd2, &usockvec[1]);
1550 if (err)
1551 goto out;
1552
1553 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 * Obtain the first socket and check if the underlying protocol
1555 * supports the socketpair call.
1556 */
1557
1558 err = sock_create(family, type, protocol, &sock1);
Al Viro016a2662017-12-05 23:28:38 +00001559 if (unlikely(err < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560 goto out;
1561
1562 err = sock_create(family, type, protocol, &sock2);
Al Viro016a2662017-12-05 23:28:38 +00001563 if (unlikely(err < 0)) {
1564 sock_release(sock1);
1565 goto out;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001566 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001567
David Herrmannd47cd942018-05-04 16:28:20 +02001568 err = security_socket_socketpair(sock1, sock2);
1569 if (unlikely(err)) {
1570 sock_release(sock2);
1571 sock_release(sock1);
1572 goto out;
1573 }
1574
Al Viro016a2662017-12-05 23:28:38 +00001575 err = sock1->ops->socketpair(sock1, sock2);
1576 if (unlikely(err < 0)) {
1577 sock_release(sock2);
1578 sock_release(sock1);
1579 goto out;
Al Viro28407632012-08-17 23:54:15 -04001580 }
1581
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001582 newfile1 = sock_alloc_file(sock1, flags, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301583 if (IS_ERR(newfile1)) {
Al Viro28407632012-08-17 23:54:15 -04001584 err = PTR_ERR(newfile1);
Al Viro016a2662017-12-05 23:28:38 +00001585 sock_release(sock2);
1586 goto out;
Al Viro28407632012-08-17 23:54:15 -04001587 }
1588
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001589 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001590 if (IS_ERR(newfile2)) {
1591 err = PTR_ERR(newfile2);
Al Viro016a2662017-12-05 23:28:38 +00001592 fput(newfile1);
1593 goto out;
Al Virodb349502007-02-07 01:48:00 -05001594 }
1595
Al Viro157cf642008-12-14 04:57:47 -05001596 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001597
Al Virodb349502007-02-07 01:48:00 -05001598 fd_install(fd1, newfile1);
1599 fd_install(fd2, newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001600 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602out:
Al Viro016a2662017-12-05 23:28:38 +00001603 put_unused_fd(fd2);
1604 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 return err;
1606}
1607
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001608SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1609 int __user *, usockvec)
1610{
1611 return __sys_socketpair(family, type, protocol, usockvec);
1612}
1613
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614/*
1615 * Bind a name to a socket. Nothing much to do here since it's
1616 * the protocol's responsibility to handle the local address.
1617 *
1618 * We move the socket address to kernel space before we call
1619 * the protocol layer (having also checked the address is ok).
1620 */
1621
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001622int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623{
1624 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001625 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001626 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001628 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001629 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001630 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Jakub Sitnicki068b88c2018-10-04 11:09:40 +02001631 if (!err) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001632 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001633 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001634 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001635 if (!err)
1636 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001637 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001638 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001640 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001641 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642 return err;
1643}
1644
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001645SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1646{
1647 return __sys_bind(fd, umyaddr, addrlen);
1648}
1649
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650/*
1651 * Perform a listen. Basically, we allow the protocol to do anything
1652 * necessary for a listen, and if that works, we mark the socket as
1653 * ready for listening.
1654 */
1655
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001656int __sys_listen(int fd, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657{
1658 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001659 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001660 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001661
1662 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1663 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001664 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001665 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001666 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667
1668 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001669 if (!err)
1670 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001672 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673 }
1674 return err;
1675}
1676
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001677SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1678{
1679 return __sys_listen(fd, backlog);
1680}
1681
Jens Axboede2ea4b2019-10-17 14:41:29 -06001682int __sys_accept4_file(struct file *file, unsigned file_flags,
1683 struct sockaddr __user *upeer_sockaddr,
Jens Axboe09952e32020-03-19 20:16:56 -06001684 int __user *upeer_addrlen, int flags,
1685 unsigned long nofile)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686{
1687 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001688 struct file *newfile;
Jens Axboede2ea4b2019-10-17 14:41:29 -06001689 int err, len, newfd;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001690 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691
Ulrich Drepper77d27202008-07-23 21:29:35 -07001692 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001693 return -EINVAL;
1694
1695 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1696 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1697
Florent Revestdba4a922020-12-04 12:36:04 +01001698 sock = sock_from_file(file);
1699 if (!sock) {
1700 err = -ENOTSOCK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 goto out;
Florent Revestdba4a922020-12-04 12:36:04 +01001702 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703
1704 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001705 newsock = sock_alloc();
1706 if (!newsock)
Jens Axboede2ea4b2019-10-17 14:41:29 -06001707 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708
1709 newsock->type = sock->type;
1710 newsock->ops = sock->ops;
1711
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712 /*
1713 * We don't need try_module_get here, as the listening socket (sock)
1714 * has the protocol module (sock->ops->owner) held.
1715 */
1716 __module_get(newsock->ops->owner);
1717
Jens Axboe09952e32020-03-19 20:16:56 -06001718 newfd = __get_unused_fd_flags(flags, nofile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001719 if (unlikely(newfd < 0)) {
1720 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001721 sock_release(newsock);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001722 goto out;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001723 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001724 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301725 if (IS_ERR(newfile)) {
Al Viro28407632012-08-17 23:54:15 -04001726 err = PTR_ERR(newfile);
1727 put_unused_fd(newfd);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001728 goto out;
Al Viro28407632012-08-17 23:54:15 -04001729 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001730
Frank Filza79af592005-09-27 15:23:38 -07001731 err = security_socket_accept(sock, newsock);
1732 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001733 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001734
Jens Axboede2ea4b2019-10-17 14:41:29 -06001735 err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags,
1736 false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001738 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739
1740 if (upeer_sockaddr) {
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001741 len = newsock->ops->getname(newsock,
1742 (struct sockaddr *)&address, 2);
1743 if (len < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001745 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001747 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001748 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001750 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751 }
1752
1753 /* File flags are not inherited via accept() unlike another OSes. */
1754
David S. Miller39d8c1b2006-03-20 17:13:49 -08001755 fd_install(newfd, newfile);
1756 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757out:
1758 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001759out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001760 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001761 put_unused_fd(newfd);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001762 goto out;
1763
1764}
1765
1766/*
1767 * For accept, we attempt to create a new socket, set up the link
1768 * with the client, wake up the client, then return the new
1769 * connected fd. We collect the address of the connector in kernel
1770 * space and move it to user at the very end. This is unclean because
1771 * we open the socket then return an error.
1772 *
1773 * 1003.1g adds the ability to recvmsg() to query connection pending
1774 * status to recvmsg. We need to add that support in a way thats
1775 * clean when we restructure accept also.
1776 */
1777
1778int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
1779 int __user *upeer_addrlen, int flags)
1780{
1781 int ret = -EBADF;
1782 struct fd f;
1783
1784 f = fdget(fd);
1785 if (f.file) {
1786 ret = __sys_accept4_file(f.file, 0, upeer_sockaddr,
Jens Axboe09952e32020-03-19 20:16:56 -06001787 upeer_addrlen, flags,
1788 rlimit(RLIMIT_NOFILE));
Miaohe Lin6b07ede2020-08-06 19:52:24 +08001789 fdput(f);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001790 }
1791
1792 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793}
1794
Dominik Brodowski4541e802018-03-13 19:24:23 +01001795SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1796 int __user *, upeer_addrlen, int, flags)
1797{
1798 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
1799}
1800
Heiko Carstens20f37032009-01-14 14:14:23 +01001801SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1802 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001803{
Dominik Brodowski4541e802018-03-13 19:24:23 +01001804 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001805}
1806
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807/*
1808 * Attempt to connect to a socket with the server address. The address
1809 * is in user space so we verify it is OK and move it to kernel space.
1810 *
1811 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1812 * break bindings
1813 *
1814 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1815 * other SEQPACKET protocols that take time to connect() as it doesn't
1816 * include the -EINPROGRESS status for such sockets.
1817 */
1818
Jens Axboef499a022019-12-02 16:28:46 -07001819int __sys_connect_file(struct file *file, struct sockaddr_storage *address,
Jens Axboebd3ded32019-11-23 14:17:16 -07001820 int addrlen, int file_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821{
1822 struct socket *sock;
Jens Axboebd3ded32019-11-23 14:17:16 -07001823 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824
Florent Revestdba4a922020-12-04 12:36:04 +01001825 sock = sock_from_file(file);
1826 if (!sock) {
1827 err = -ENOTSOCK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828 goto out;
Florent Revestdba4a922020-12-04 12:36:04 +01001829 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001831 err =
Jens Axboef499a022019-12-02 16:28:46 -07001832 security_socket_connect(sock, (struct sockaddr *)address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 if (err)
Jens Axboebd3ded32019-11-23 14:17:16 -07001834 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835
Jens Axboef499a022019-12-02 16:28:46 -07001836 err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,
Jens Axboebd3ded32019-11-23 14:17:16 -07001837 sock->file->f_flags | file_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838out:
1839 return err;
1840}
1841
Jens Axboebd3ded32019-11-23 14:17:16 -07001842int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
1843{
1844 int ret = -EBADF;
1845 struct fd f;
1846
1847 f = fdget(fd);
1848 if (f.file) {
Jens Axboef499a022019-12-02 16:28:46 -07001849 struct sockaddr_storage address;
1850
1851 ret = move_addr_to_kernel(uservaddr, addrlen, &address);
1852 if (!ret)
1853 ret = __sys_connect_file(f.file, &address, addrlen, 0);
Miaohe Lin6b07ede2020-08-06 19:52:24 +08001854 fdput(f);
Jens Axboebd3ded32019-11-23 14:17:16 -07001855 }
1856
1857 return ret;
1858}
1859
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01001860SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1861 int, addrlen)
1862{
1863 return __sys_connect(fd, uservaddr, addrlen);
1864}
1865
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866/*
1867 * Get the local address ('name') of a socket object. Move the obtained
1868 * name to user space.
1869 */
1870
Dominik Brodowski8882a102018-03-13 19:43:14 +01001871int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1872 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873{
1874 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001875 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001876 int err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001877
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001878 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879 if (!sock)
1880 goto out;
1881
1882 err = security_socket_getsockname(sock);
1883 if (err)
1884 goto out_put;
1885
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001886 err = sock->ops->getname(sock, (struct sockaddr *)&address, 0);
1887 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888 goto out_put;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001889 /* "err" is actually length in this case */
1890 err = move_addr_to_user(&address, err, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891
1892out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001893 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894out:
1895 return err;
1896}
1897
Dominik Brodowski8882a102018-03-13 19:43:14 +01001898SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1899 int __user *, usockaddr_len)
1900{
1901 return __sys_getsockname(fd, usockaddr, usockaddr_len);
1902}
1903
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904/*
1905 * Get the remote address ('name') of a socket object. Move the obtained
1906 * name to user space.
1907 */
1908
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001909int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1910 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911{
1912 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001913 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001914 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001916 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1917 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 err = security_socket_getpeername(sock);
1919 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001920 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921 return err;
1922 }
1923
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001924 err = sock->ops->getname(sock, (struct sockaddr *)&address, 1);
1925 if (err >= 0)
1926 /* "err" is actually length in this case */
1927 err = move_addr_to_user(&address, err, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001928 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001929 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930 }
1931 return err;
1932}
1933
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001934SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1935 int __user *, usockaddr_len)
1936{
1937 return __sys_getpeername(fd, usockaddr, usockaddr_len);
1938}
1939
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940/*
1941 * Send a datagram to a given address. We move the address into kernel
1942 * space and check the user space data area is readable before invoking
1943 * the protocol.
1944 */
Dominik Brodowski211b6342018-03-13 19:18:52 +01001945int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
1946 struct sockaddr __user *addr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947{
1948 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001949 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950 int err;
1951 struct msghdr msg;
1952 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001953 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001954
Al Viro602bd0e2015-03-21 19:12:32 -04001955 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
1956 if (unlikely(err))
1957 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001958 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1959 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001960 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001961
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001962 msg.msg_name = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001963 msg.msg_control = NULL;
1964 msg.msg_controllen = 0;
1965 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001966 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001967 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968 if (err < 0)
1969 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001970 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001971 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 }
1973 if (sock->file->f_flags & O_NONBLOCK)
1974 flags |= MSG_DONTWAIT;
1975 msg.msg_flags = flags;
Al Virod8725c82014-12-11 00:02:50 -05001976 err = sock_sendmsg(sock, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001978out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001979 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08001980out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981 return err;
1982}
1983
Dominik Brodowski211b6342018-03-13 19:18:52 +01001984SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1985 unsigned int, flags, struct sockaddr __user *, addr,
1986 int, addr_len)
1987{
1988 return __sys_sendto(fd, buff, len, flags, addr, addr_len);
1989}
1990
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001992 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993 */
1994
Heiko Carstens3e0fa652009-01-14 14:14:24 +01001995SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00001996 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997{
Dominik Brodowski211b6342018-03-13 19:18:52 +01001998 return __sys_sendto(fd, buff, len, flags, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999}
2000
2001/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002002 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 * sender. We verify the buffers are writable and if needed move the
2004 * sender address from kernel to user space.
2005 */
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002006int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
2007 struct sockaddr __user *addr, int __user *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008{
2009 struct socket *sock;
2010 struct iovec iov;
2011 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002012 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002013 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002014 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002015
Al Viro602bd0e2015-03-21 19:12:32 -04002016 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
2017 if (unlikely(err))
2018 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002019 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002021 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002023 msg.msg_control = NULL;
2024 msg.msg_controllen = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002025 /* Save some cycles and don't copy the address if not needed */
2026 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
2027 /* We assume all kernel code knows the size of sockaddr_storage */
2028 msg.msg_namelen = 0;
tadeusz.struk@intel.com130ed5d2015-12-15 10:46:17 -08002029 msg.msg_iocb = NULL;
Alexander Potapenko9f138fa2017-03-08 18:08:16 +01002030 msg.msg_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002031 if (sock->file->f_flags & O_NONBLOCK)
2032 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002033 err = sock_recvmsg(sock, &msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002035 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002036 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002037 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002038 if (err2 < 0)
2039 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002041
2042 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08002043out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002044 return err;
2045}
2046
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002047SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
2048 unsigned int, flags, struct sockaddr __user *, addr,
2049 int __user *, addr_len)
2050{
2051 return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len);
2052}
2053
Linus Torvalds1da177e2005-04-16 15:20:36 -07002054/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002055 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056 */
2057
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02002058SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
2059 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060{
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002061 return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062}
2063
Florian Westphal83f0c102020-07-05 01:30:15 +02002064static bool sock_use_custom_sol_socket(const struct socket *sock)
2065{
2066 const struct sock *sk = sock->sk;
2067
2068 /* Use sock->ops->setsockopt() for MPTCP */
2069 return IS_ENABLED(CONFIG_MPTCP) &&
2070 sk->sk_protocol == IPPROTO_MPTCP &&
2071 sk->sk_type == SOCK_STREAM &&
2072 (sk->sk_family == AF_INET || sk->sk_family == AF_INET6);
2073}
2074
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075/*
2076 * Set a socket option. Because we don't know the option lengths we have
2077 * to pass the user mode parameter for the protocols to sort out.
2078 */
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002079int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval,
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002080 int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081{
Christoph Hellwig519a8a62020-08-10 18:42:14 +02002082 sockptr_t optval = USER_SOCKPTR(user_optval);
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002083 char *kernel_optval = NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002084 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085 struct socket *sock;
2086
2087 if (optlen < 0)
2088 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002089
2090 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002091 if (!sock)
2092 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002093
Christoph Hellwig4a367292020-07-17 08:23:11 +02002094 err = security_socket_setsockopt(sock, level, optname);
2095 if (err)
2096 goto out_put;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002097
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002098 if (!in_compat_syscall())
2099 err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname,
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002100 user_optval, &optlen,
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002101 &kernel_optval);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002102 if (err < 0)
2103 goto out_put;
2104 if (err > 0) {
2105 err = 0;
2106 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107 }
Christoph Hellwig4a367292020-07-17 08:23:11 +02002108
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002109 if (kernel_optval)
2110 optval = KERNEL_SOCKPTR(kernel_optval);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002111 if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock))
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002112 err = sock_setsockopt(sock, level, optname, optval, optlen);
Christoph Hellwiga44d9e72020-07-17 08:23:31 +02002113 else if (unlikely(!sock->ops->setsockopt))
2114 err = -EOPNOTSUPP;
Christoph Hellwig4a367292020-07-17 08:23:11 +02002115 else
2116 err = sock->ops->setsockopt(sock, level, optname, optval,
2117 optlen);
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002118 kfree(kernel_optval);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002119out_put:
2120 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002121 return err;
2122}
2123
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002124SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
2125 char __user *, optval, int, optlen)
2126{
2127 return __sys_setsockopt(fd, level, optname, optval, optlen);
2128}
2129
Linus Torvalds1da177e2005-04-16 15:20:36 -07002130/*
2131 * Get a socket option. Because we don't know the option lengths we have
2132 * to pass a user mode parameter for the protocols to sort out.
2133 */
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002134int __sys_getsockopt(int fd, int level, int optname, char __user *optval,
2135 int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002136{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002137 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002138 struct socket *sock;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002139 int max_optlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002141 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002142 if (!sock)
2143 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002145 err = security_socket_getsockopt(sock, level, optname);
2146 if (err)
2147 goto out_put;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002148
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002149 if (!in_compat_syscall())
2150 max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen);
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002151
2152 if (level == SOL_SOCKET)
2153 err = sock_getsockopt(sock, level, optname, optval, optlen);
Christoph Hellwiga44d9e72020-07-17 08:23:31 +02002154 else if (unlikely(!sock->ops->getsockopt))
2155 err = -EOPNOTSUPP;
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002156 else
2157 err = sock->ops->getsockopt(sock, level, optname, optval,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002158 optlen);
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002159
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002160 if (!in_compat_syscall())
2161 err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname,
2162 optval, optlen, max_optlen,
2163 err);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002164out_put:
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002165 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166 return err;
2167}
2168
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002169SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
2170 char __user *, optval, int __user *, optlen)
2171{
2172 return __sys_getsockopt(fd, level, optname, optval, optlen);
2173}
2174
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175/*
2176 * Shutdown a socket.
2177 */
2178
Jens Axboeb713c192020-09-05 11:13:35 -06002179int __sys_shutdown_sock(struct socket *sock, int how)
2180{
2181 int err;
2182
2183 err = security_socket_shutdown(sock, how);
2184 if (!err)
2185 err = sock->ops->shutdown(sock, how);
2186
2187 return err;
2188}
2189
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002190int __sys_shutdown(int fd, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002192 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002193 struct socket *sock;
2194
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002195 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2196 if (sock != NULL) {
Jens Axboeb713c192020-09-05 11:13:35 -06002197 err = __sys_shutdown_sock(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002198 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002199 }
2200 return err;
2201}
2202
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002203SYSCALL_DEFINE2(shutdown, int, fd, int, how)
2204{
2205 return __sys_shutdown(fd, how);
2206}
2207
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002208/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209 * fields which are the same type (int / unsigned) on our platforms.
2210 */
2211#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
2212#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
2213#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
2214
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002215struct used_address {
2216 struct sockaddr_storage name;
2217 unsigned int name_len;
2218};
2219
Jens Axboe0a384ab2020-02-27 08:11:20 -07002220int __copy_msghdr_from_user(struct msghdr *kmsg,
2221 struct user_msghdr __user *umsg,
2222 struct sockaddr __user **save_addr,
2223 struct iovec __user **uiov, size_t *nsegs)
Dan Carpenter1661bf32013-10-03 00:27:20 +03002224{
Al Viroffb07552017-06-27 19:32:04 -04002225 struct user_msghdr msg;
Al Viro08adb7d2014-11-10 20:23:13 -05002226 ssize_t err;
2227
Al Viroffb07552017-06-27 19:32:04 -04002228 if (copy_from_user(&msg, umsg, sizeof(*umsg)))
Dan Carpenter1661bf32013-10-03 00:27:20 +03002229 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00002230
Christoph Hellwig1f466e12020-05-11 13:59:13 +02002231 kmsg->msg_control_is_user = true;
2232 kmsg->msg_control_user = msg.msg_control;
Al Viroffb07552017-06-27 19:32:04 -04002233 kmsg->msg_controllen = msg.msg_controllen;
2234 kmsg->msg_flags = msg.msg_flags;
2235
2236 kmsg->msg_namelen = msg.msg_namelen;
2237 if (!msg.msg_name)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07002238 kmsg->msg_namelen = 0;
2239
Matthew Leachdbb490b2014-03-11 11:58:27 +00002240 if (kmsg->msg_namelen < 0)
2241 return -EINVAL;
2242
Dan Carpenter1661bf32013-10-03 00:27:20 +03002243 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03002244 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05002245
2246 if (save_addr)
Al Viroffb07552017-06-27 19:32:04 -04002247 *save_addr = msg.msg_name;
Al Viro08adb7d2014-11-10 20:23:13 -05002248
Al Viroffb07552017-06-27 19:32:04 -04002249 if (msg.msg_name && kmsg->msg_namelen) {
Al Viro08adb7d2014-11-10 20:23:13 -05002250 if (!save_addr) {
Paolo Abeni864d9662017-07-21 18:49:45 +02002251 err = move_addr_to_kernel(msg.msg_name,
2252 kmsg->msg_namelen,
Al Viro08adb7d2014-11-10 20:23:13 -05002253 kmsg->msg_name);
2254 if (err < 0)
2255 return err;
2256 }
2257 } else {
2258 kmsg->msg_name = NULL;
2259 kmsg->msg_namelen = 0;
2260 }
2261
Al Viroffb07552017-06-27 19:32:04 -04002262 if (msg.msg_iovlen > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05002263 return -EMSGSIZE;
2264
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002265 kmsg->msg_iocb = NULL;
Jens Axboe0a384ab2020-02-27 08:11:20 -07002266 *uiov = msg.msg_iov;
2267 *nsegs = msg.msg_iovlen;
2268 return 0;
2269}
2270
2271static int copy_msghdr_from_user(struct msghdr *kmsg,
2272 struct user_msghdr __user *umsg,
2273 struct sockaddr __user **save_addr,
2274 struct iovec **iov)
2275{
2276 struct user_msghdr msg;
2277 ssize_t err;
2278
2279 err = __copy_msghdr_from_user(kmsg, umsg, save_addr, &msg.msg_iov,
2280 &msg.msg_iovlen);
2281 if (err)
2282 return err;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002283
Jens Axboe87e5e6d2019-05-14 16:02:22 -06002284 err = import_iovec(save_addr ? READ : WRITE,
Al Viroffb07552017-06-27 19:32:04 -04002285 msg.msg_iov, msg.msg_iovlen,
Al Viroda184282015-03-21 19:29:06 -04002286 UIO_FASTIOV, iov, &kmsg->msg_iter);
Jens Axboe87e5e6d2019-05-14 16:02:22 -06002287 return err < 0 ? err : 0;
Dan Carpenter1661bf32013-10-03 00:27:20 +03002288}
2289
Jens Axboe4257c8c2019-11-25 14:27:34 -07002290static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys,
2291 unsigned int flags, struct used_address *used_address,
2292 unsigned int allowed_msghdr_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002293{
Alex Williamsonb9d717a2005-09-26 14:28:02 -07002294 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Amit Kushwaha846cc122016-12-08 18:21:53 +05302295 __aligned(sizeof(__kernel_size_t));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002296 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002297 unsigned char *ctl_buf = ctl;
Al Virod8725c82014-12-11 00:02:50 -05002298 int ctl_len;
Al Viro08adb7d2014-11-10 20:23:13 -05002299 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002300
Linus Torvalds1da177e2005-04-16 15:20:36 -07002301 err = -ENOBUFS;
2302
Anton Blanchard228e5482011-05-02 20:21:35 +00002303 if (msg_sys->msg_controllen > INT_MAX)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002304 goto out;
Tom Herbert28a94d82016-03-07 14:11:02 -08002305 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
Anton Blanchard228e5482011-05-02 20:21:35 +00002306 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002308 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00002309 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002310 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002311 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002312 goto out;
Anton Blanchard228e5482011-05-02 20:21:35 +00002313 ctl_buf = msg_sys->msg_control;
2314 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002315 } else if (ctl_len) {
David S. Millerac4340f2017-01-04 13:24:19 -05002316 BUILD_BUG_ON(sizeof(struct cmsghdr) !=
2317 CMSG_ALIGN(sizeof(struct cmsghdr)));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002318 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002320 if (ctl_buf == NULL)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002321 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322 }
2323 err = -EFAULT;
Christoph Hellwig1f466e12020-05-11 13:59:13 +02002324 if (copy_from_user(ctl_buf, msg_sys->msg_control_user, ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00002326 msg_sys->msg_control = ctl_buf;
Christoph Hellwig1f466e12020-05-11 13:59:13 +02002327 msg_sys->msg_control_is_user = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002328 }
Anton Blanchard228e5482011-05-02 20:21:35 +00002329 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002330
2331 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00002332 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002333 /*
2334 * If this is sendmmsg() and current destination address is same as
2335 * previously succeeded address, omit asking LSM's decision.
2336 * used_address->name_len is initialized to UINT_MAX so that the first
2337 * destination address never matches.
2338 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002339 if (used_address && msg_sys->msg_name &&
2340 used_address->name_len == msg_sys->msg_namelen &&
2341 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002342 used_address->name_len)) {
Al Virod8725c82014-12-11 00:02:50 -05002343 err = sock_sendmsg_nosec(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002344 goto out_freectl;
2345 }
Al Virod8725c82014-12-11 00:02:50 -05002346 err = sock_sendmsg(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002347 /*
2348 * If this is sendmmsg() and sending to current destination address was
2349 * successful, remember it.
2350 */
2351 if (used_address && err >= 0) {
2352 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002353 if (msg_sys->msg_name)
2354 memcpy(&used_address->name, msg_sys->msg_name,
2355 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002356 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002357
2358out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002359 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
Jens Axboe4257c8c2019-11-25 14:27:34 -07002361out:
2362 return err;
2363}
2364
Jens Axboe03b12302019-12-02 18:50:25 -07002365int sendmsg_copy_msghdr(struct msghdr *msg,
2366 struct user_msghdr __user *umsg, unsigned flags,
2367 struct iovec **iov)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002368{
2369 int err;
2370
2371 if (flags & MSG_CMSG_COMPAT) {
2372 struct compat_msghdr __user *msg_compat;
2373
2374 msg_compat = (struct compat_msghdr __user *) umsg;
2375 err = get_compat_msghdr(msg, msg_compat, NULL, iov);
2376 } else {
2377 err = copy_msghdr_from_user(msg, umsg, NULL, iov);
2378 }
2379 if (err < 0)
2380 return err;
2381
2382 return 0;
2383}
2384
2385static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
2386 struct msghdr *msg_sys, unsigned int flags,
2387 struct used_address *used_address,
2388 unsigned int allowed_msghdr_flags)
2389{
2390 struct sockaddr_storage address;
2391 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2392 ssize_t err;
2393
2394 msg_sys->msg_name = &address;
2395
2396 err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov);
2397 if (err < 0)
2398 return err;
2399
2400 err = ____sys_sendmsg(sock, msg_sys, flags, used_address,
2401 allowed_msghdr_flags);
Al Viroda184282015-03-21 19:29:06 -04002402 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00002403 return err;
2404}
2405
2406/*
2407 * BSD sendmsg interface
2408 */
Jens Axboe03b12302019-12-02 18:50:25 -07002409long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,
Jens Axboe0fa03c62019-04-19 13:34:07 -06002410 unsigned int flags)
2411{
Jens Axboed69e0772019-11-25 17:04:13 -07002412 /* disallow ancillary data requests from this path */
Jens Axboe03b12302019-12-02 18:50:25 -07002413 if (msg->msg_control || msg->msg_controllen)
2414 return -EINVAL;
Jens Axboed69e0772019-11-25 17:04:13 -07002415
Jens Axboe03b12302019-12-02 18:50:25 -07002416 return ____sys_sendmsg(sock, msg, flags, NULL, 0);
Jens Axboe0fa03c62019-04-19 13:34:07 -06002417}
Anton Blanchard228e5482011-05-02 20:21:35 +00002418
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002419long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2420 bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002421{
2422 int fput_needed, err;
2423 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002424 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00002425
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002426 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2427 return -EINVAL;
2428
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002429 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00002430 if (!sock)
2431 goto out;
2432
Tom Herbert28a94d82016-03-07 14:11:02 -08002433 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
Anton Blanchard228e5482011-05-02 20:21:35 +00002434
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002435 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002436out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002437 return err;
2438}
2439
Al Viro666547f2014-04-06 14:03:05 -04002440SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002441{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002442 return __sys_sendmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002443}
2444
Anton Blanchard228e5482011-05-02 20:21:35 +00002445/*
2446 * Linux sendmmsg interface
2447 */
2448
2449int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002450 unsigned int flags, bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002451{
2452 int fput_needed, err, datagrams;
2453 struct socket *sock;
2454 struct mmsghdr __user *entry;
2455 struct compat_mmsghdr __user *compat_entry;
2456 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002457 struct used_address used_address;
Tom Herbertf0922762016-03-07 14:11:03 -08002458 unsigned int oflags = flags;
Anton Blanchard228e5482011-05-02 20:21:35 +00002459
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002460 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2461 return -EINVAL;
2462
Anton Blanchard98382f42011-08-04 14:07:39 +00002463 if (vlen > UIO_MAXIOV)
2464 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002465
2466 datagrams = 0;
2467
2468 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2469 if (!sock)
2470 return err;
2471
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002472 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002473 entry = mmsg;
2474 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002475 err = 0;
Tom Herbertf0922762016-03-07 14:11:03 -08002476 flags |= MSG_BATCH;
Anton Blanchard228e5482011-05-02 20:21:35 +00002477
2478 while (datagrams < vlen) {
Tom Herbertf0922762016-03-07 14:11:03 -08002479 if (datagrams == vlen - 1)
2480 flags = oflags;
2481
Anton Blanchard228e5482011-05-02 20:21:35 +00002482 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002483 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002484 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002485 if (err < 0)
2486 break;
2487 err = __put_user(err, &compat_entry->msg_len);
2488 ++compat_entry;
2489 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002490 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002491 (struct user_msghdr __user *)entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002492 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002493 if (err < 0)
2494 break;
2495 err = put_user(err, &entry->msg_len);
2496 ++entry;
2497 }
2498
2499 if (err)
2500 break;
2501 ++datagrams;
Soheil Hassas Yeganeh30238982016-11-04 15:36:49 -04002502 if (msg_data_left(&msg_sys))
2503 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002504 cond_resched();
Anton Blanchard228e5482011-05-02 20:21:35 +00002505 }
2506
Anton Blanchard228e5482011-05-02 20:21:35 +00002507 fput_light(sock->file, fput_needed);
2508
Anton Blanchard728ffb82011-08-04 14:07:38 +00002509 /* We only return an error if no datagrams were able to be sent */
2510 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002511 return datagrams;
2512
Anton Blanchard228e5482011-05-02 20:21:35 +00002513 return err;
2514}
2515
2516SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2517 unsigned int, vlen, unsigned int, flags)
2518{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002519 return __sys_sendmmsg(fd, mmsg, vlen, flags, true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002520}
2521
Jens Axboe03b12302019-12-02 18:50:25 -07002522int recvmsg_copy_msghdr(struct msghdr *msg,
2523 struct user_msghdr __user *umsg, unsigned flags,
2524 struct sockaddr __user **uaddr,
2525 struct iovec **iov)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002526{
2527 ssize_t err;
2528
2529 if (MSG_CMSG_COMPAT & flags) {
2530 struct compat_msghdr __user *msg_compat;
2531
2532 msg_compat = (struct compat_msghdr __user *) umsg;
2533 err = get_compat_msghdr(msg, msg_compat, uaddr, iov);
2534 } else {
2535 err = copy_msghdr_from_user(msg, umsg, uaddr, iov);
2536 }
2537 if (err < 0)
2538 return err;
2539
2540 return 0;
2541}
2542
2543static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys,
2544 struct user_msghdr __user *msg,
2545 struct sockaddr __user *uaddr,
2546 unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002547{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002548 struct compat_msghdr __user *msg_compat =
Jens Axboe4257c8c2019-11-25 14:27:34 -07002549 (struct compat_msghdr __user *) msg;
2550 int __user *uaddr_len = COMPAT_NAMELEN(msg);
2551 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002552 unsigned long cmsg_ptr;
Al Viro2da62902015-03-14 21:13:46 -04002553 int len;
Al Viro08adb7d2014-11-10 20:23:13 -05002554 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002555
Al Viro08adb7d2014-11-10 20:23:13 -05002556 msg_sys->msg_name = &addr;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002557 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2558 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002559
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002560 /* We assume all kernel code knows the size of sockaddr_storage */
2561 msg_sys->msg_namelen = 0;
2562
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563 if (sock->file->f_flags & O_NONBLOCK)
2564 flags |= MSG_DONTWAIT;
Eric Dumazet1af66222019-12-06 09:38:36 -08002565
2566 if (unlikely(nosec))
2567 err = sock_recvmsg_nosec(sock, msg_sys, flags);
2568 else
2569 err = sock_recvmsg(sock, msg_sys, flags);
2570
Linus Torvalds1da177e2005-04-16 15:20:36 -07002571 if (err < 0)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002572 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573 len = err;
2574
2575 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002576 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002577 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002578 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002579 if (err < 0)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002580 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002581 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002582 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002583 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002584 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002585 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002586 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002587 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002588 &msg_compat->msg_controllen);
2589 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002590 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002591 &msg->msg_controllen);
2592 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002593 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002594 err = len;
Jens Axboe4257c8c2019-11-25 14:27:34 -07002595out:
2596 return err;
2597}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002598
Jens Axboe4257c8c2019-11-25 14:27:34 -07002599static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
2600 struct msghdr *msg_sys, unsigned int flags, int nosec)
2601{
2602 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2603 /* user mode address pointers */
2604 struct sockaddr __user *uaddr;
2605 ssize_t err;
2606
2607 err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov);
2608 if (err < 0)
2609 return err;
2610
2611 err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec);
Al Viroda184282015-03-21 19:29:06 -04002612 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002613 return err;
2614}
2615
2616/*
2617 * BSD recvmsg interface
2618 */
2619
Jens Axboe03b12302019-12-02 18:50:25 -07002620long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg,
2621 struct user_msghdr __user *umsg,
2622 struct sockaddr __user *uaddr, unsigned int flags)
Jens Axboeaa1fa282019-04-19 13:38:09 -06002623{
Luke Hsiao583bbf02020-08-21 21:41:04 -07002624 if (msg->msg_control || msg->msg_controllen) {
2625 /* disallow ancillary data reqs unless cmsg is plain data */
2626 if (!(sock->ops->flags & PROTO_CMSG_DATA_ONLY))
2627 return -EINVAL;
2628 }
Jens Axboed69e0772019-11-25 17:04:13 -07002629
Jens Axboe03b12302019-12-02 18:50:25 -07002630 return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0);
Jens Axboeaa1fa282019-04-19 13:38:09 -06002631}
2632
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002633long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2634 bool forbid_cmsg_compat)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002635{
2636 int fput_needed, err;
2637 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002638 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002639
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002640 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2641 return -EINVAL;
2642
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002643 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002644 if (!sock)
2645 goto out;
2646
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002647 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002648
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002649 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002650out:
2651 return err;
2652}
2653
Al Viro666547f2014-04-06 14:03:05 -04002654SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002655 unsigned int, flags)
2656{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002657 return __sys_recvmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002658}
2659
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002660/*
2661 * Linux recvmmsg interface
2662 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002663
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002664static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2665 unsigned int vlen, unsigned int flags,
2666 struct timespec64 *timeout)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002667{
2668 int fput_needed, err, datagrams;
2669 struct socket *sock;
2670 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002671 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002672 struct msghdr msg_sys;
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002673 struct timespec64 end_time;
2674 struct timespec64 timeout64;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002675
2676 if (timeout &&
2677 poll_select_set_timeout(&end_time, timeout->tv_sec,
2678 timeout->tv_nsec))
2679 return -EINVAL;
2680
2681 datagrams = 0;
2682
2683 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2684 if (!sock)
2685 return err;
2686
Soheil Hassas Yeganeh7797dc42018-02-27 18:22:40 -05002687 if (likely(!(flags & MSG_ERRQUEUE))) {
2688 err = sock_error(sock->sk);
2689 if (err) {
2690 datagrams = err;
2691 goto out_put;
2692 }
Maxime Jayate623a9e2017-02-21 18:35:51 +01002693 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002694
2695 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002696 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002697
2698 while (datagrams < vlen) {
2699 /*
2700 * No need to ask LSM for more than the first datagram.
2701 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002702 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002703 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002704 &msg_sys, flags & ~MSG_WAITFORONE,
2705 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002706 if (err < 0)
2707 break;
2708 err = __put_user(err, &compat_entry->msg_len);
2709 ++compat_entry;
2710 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002711 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002712 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002713 &msg_sys, flags & ~MSG_WAITFORONE,
2714 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002715 if (err < 0)
2716 break;
2717 err = put_user(err, &entry->msg_len);
2718 ++entry;
2719 }
2720
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002721 if (err)
2722 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002723 ++datagrams;
2724
Brandon L Black71c5c1592010-03-26 16:18:03 +00002725 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2726 if (flags & MSG_WAITFORONE)
2727 flags |= MSG_DONTWAIT;
2728
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002729 if (timeout) {
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002730 ktime_get_ts64(&timeout64);
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002731 *timeout = timespec64_sub(end_time, timeout64);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002732 if (timeout->tv_sec < 0) {
2733 timeout->tv_sec = timeout->tv_nsec = 0;
2734 break;
2735 }
2736
2737 /* Timeout, return less than vlen datagrams */
2738 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2739 break;
2740 }
2741
2742 /* Out of band data, return right away */
2743 if (msg_sys.msg_flags & MSG_OOB)
2744 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002745 cond_resched();
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002746 }
2747
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002748 if (err == 0)
2749 goto out_put;
2750
2751 if (datagrams == 0) {
2752 datagrams = err;
2753 goto out_put;
2754 }
2755
2756 /*
2757 * We may return less entries than requested (vlen) if the
2758 * sock is non block and there aren't enough datagrams...
2759 */
2760 if (err != -EAGAIN) {
2761 /*
2762 * ... or if recvmsg returns an error after we
2763 * received some datagrams, where we record the
2764 * error to return on the next call or if the
2765 * app asks about it using getsockopt(SO_ERROR).
2766 */
2767 sock->sk->sk_err = -err;
2768 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002769out_put:
2770 fput_light(sock->file, fput_needed);
2771
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002772 return datagrams;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002773}
2774
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002775int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2776 unsigned int vlen, unsigned int flags,
2777 struct __kernel_timespec __user *timeout,
2778 struct old_timespec32 __user *timeout32)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002779{
2780 int datagrams;
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002781 struct timespec64 timeout_sys;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002782
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002783 if (timeout && get_timespec64(&timeout_sys, timeout))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002784 return -EFAULT;
2785
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002786 if (timeout32 && get_old_timespec32(&timeout_sys, timeout32))
2787 return -EFAULT;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002788
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002789 if (!timeout && !timeout32)
2790 return do_recvmmsg(fd, mmsg, vlen, flags, NULL);
2791
2792 datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2793
2794 if (datagrams <= 0)
2795 return datagrams;
2796
2797 if (timeout && put_timespec64(&timeout_sys, timeout))
2798 datagrams = -EFAULT;
2799
2800 if (timeout32 && put_old_timespec32(&timeout_sys, timeout32))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002801 datagrams = -EFAULT;
2802
2803 return datagrams;
2804}
2805
Dominik Brodowski1255e262018-03-13 20:44:21 +01002806SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2807 unsigned int, vlen, unsigned int, flags,
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002808 struct __kernel_timespec __user *, timeout)
Dominik Brodowski1255e262018-03-13 20:44:21 +01002809{
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002810 if (flags & MSG_CMSG_COMPAT)
2811 return -EINVAL;
2812
2813 return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL);
Dominik Brodowski1255e262018-03-13 20:44:21 +01002814}
2815
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002816#ifdef CONFIG_COMPAT_32BIT_TIME
2817SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg,
2818 unsigned int, vlen, unsigned int, flags,
2819 struct old_timespec32 __user *, timeout)
2820{
2821 if (flags & MSG_CMSG_COMPAT)
2822 return -EINVAL;
2823
2824 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout);
2825}
2826#endif
2827
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002828#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002829/* Argument list sizes for sys_socketcall */
2830#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002831static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002832 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2833 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2834 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002835 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002836};
2837
Linus Torvalds1da177e2005-04-16 15:20:36 -07002838#undef AL
2839
2840/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002841 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002842 *
2843 * Argument checking cleaned up. Saved 20% in size.
2844 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002845 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002846 */
2847
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002848SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002849{
Chen Gang2950fa92013-04-07 16:55:23 +08002850 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002851 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002852 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002853 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002854
Anton Blanchard228e5482011-05-02 20:21:35 +00002855 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002856 return -EINVAL;
Jeremy Clinec8e8cd52018-07-27 22:43:01 +00002857 call = array_index_nospec(call, SYS_SENDMMSG + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002858
Arjan van de Ven47379052009-09-28 12:57:44 -07002859 len = nargs[call];
2860 if (len > sizeof(a))
2861 return -EINVAL;
2862
Linus Torvalds1da177e2005-04-16 15:20:36 -07002863 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002864 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002865 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002866
Chen Gang2950fa92013-04-07 16:55:23 +08002867 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2868 if (err)
2869 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002870
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002871 a0 = a[0];
2872 a1 = a[1];
2873
2874 switch (call) {
2875 case SYS_SOCKET:
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01002876 err = __sys_socket(a0, a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002877 break;
2878 case SYS_BIND:
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01002879 err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002880 break;
2881 case SYS_CONNECT:
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01002882 err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002883 break;
2884 case SYS_LISTEN:
Dominik Brodowski25e290e2018-03-13 19:36:54 +01002885 err = __sys_listen(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002886 break;
2887 case SYS_ACCEPT:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002888 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2889 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002890 break;
2891 case SYS_GETSOCKNAME:
2892 err =
Dominik Brodowski8882a102018-03-13 19:43:14 +01002893 __sys_getsockname(a0, (struct sockaddr __user *)a1,
2894 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002895 break;
2896 case SYS_GETPEERNAME:
2897 err =
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01002898 __sys_getpeername(a0, (struct sockaddr __user *)a1,
2899 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002900 break;
2901 case SYS_SOCKETPAIR:
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01002902 err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002903 break;
2904 case SYS_SEND:
Dominik Brodowskif3bf8962018-03-13 19:52:00 +01002905 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2906 NULL, 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002907 break;
2908 case SYS_SENDTO:
Dominik Brodowski211b6342018-03-13 19:18:52 +01002909 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2910 (struct sockaddr __user *)a[4], a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002911 break;
2912 case SYS_RECV:
Dominik Brodowskid27e9af2018-03-13 19:54:17 +01002913 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2914 NULL, NULL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002915 break;
2916 case SYS_RECVFROM:
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002917 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2918 (struct sockaddr __user *)a[4],
2919 (int __user *)a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002920 break;
2921 case SYS_SHUTDOWN:
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002922 err = __sys_shutdown(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002923 break;
2924 case SYS_SETSOCKOPT:
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002925 err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3],
2926 a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002927 break;
2928 case SYS_GETSOCKOPT:
2929 err =
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002930 __sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2931 (int __user *)a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002932 break;
2933 case SYS_SENDMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002934 err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1,
2935 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002936 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002937 case SYS_SENDMMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002938 err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2],
2939 a[3], true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002940 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002941 case SYS_RECVMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002942 err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1,
2943 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002944 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002945 case SYS_RECVMMSG:
Arnd Bergmann3ca47e92019-04-23 17:43:50 +02002946 if (IS_ENABLED(CONFIG_64BIT))
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002947 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
2948 a[2], a[3],
2949 (struct __kernel_timespec __user *)a[4],
2950 NULL);
2951 else
2952 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
2953 a[2], a[3], NULL,
2954 (struct old_timespec32 __user *)a[4]);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002955 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002956 case SYS_ACCEPT4:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002957 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2958 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002959 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002960 default:
2961 err = -EINVAL;
2962 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002963 }
2964 return err;
2965}
2966
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002967#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002968
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002969/**
2970 * sock_register - add a socket protocol handler
2971 * @ops: description of protocol
2972 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002973 * This function is called by a protocol handler that wants to
2974 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09002975 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002976 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002977 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002978int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002979{
2980 int err;
2981
2982 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08002983 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002984 return -ENOBUFS;
2985 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002986
2987 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00002988 if (rcu_dereference_protected(net_families[ops->family],
2989 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002990 err = -EEXIST;
2991 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00002992 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993 err = 0;
2994 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002995 spin_unlock(&net_family_lock);
2996
Yang Yingliang3410f222014-02-12 17:09:55 +08002997 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002998 return err;
2999}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003000EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003001
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003002/**
3003 * sock_unregister - remove a protocol handler
3004 * @family: protocol family to remove
3005 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003006 * This function is called by a protocol handler that wants to
3007 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003008 * new socket creation.
3009 *
3010 * If protocol handler is a module, then it can use module reference
3011 * counts to protect against new references. If protocol handler is not
3012 * a module then it needs to provide its own protection in
3013 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003014 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07003015void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003016{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07003017 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003019 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00003020 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003021 spin_unlock(&net_family_lock);
3022
3023 synchronize_rcu();
3024
Yang Yingliang3410f222014-02-12 17:09:55 +08003025 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003026}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003027EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003028
Xin Longbf2ae2e2018-03-10 18:57:50 +08003029bool sock_is_registered(int family)
3030{
Jeremy Cline66b51b02018-08-13 22:23:13 +00003031 return family < NPROTO && rcu_access_pointer(net_families[family]);
Xin Longbf2ae2e2018-03-10 18:57:50 +08003032}
3033
Andi Kleen77d76ea2005-12-22 12:43:42 -08003034static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003035{
Nick Pigginb3e19d92011-01-07 17:50:11 +11003036 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00003037 /*
3038 * Initialize the network sysctl infrastructure.
3039 */
3040 err = net_sysctl_init();
3041 if (err)
3042 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11003043
Linus Torvalds1da177e2005-04-16 15:20:36 -07003044 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003045 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07003046 */
3047 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003048
3049 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003050 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003051 */
3052
3053 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11003054
3055 err = register_filesystem(&sock_fs_type);
3056 if (err)
Miaohe Lin47260ba2020-08-06 19:54:19 +08003057 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003058 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11003059 if (IS_ERR(sock_mnt)) {
3060 err = PTR_ERR(sock_mnt);
3061 goto out_mount;
3062 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08003063
3064 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003065 */
3066
3067#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00003068 err = netfilter_init();
3069 if (err)
3070 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003071#endif
David S. Millercbeb3212005-12-22 12:58:55 -08003072
Daniel Borkmann408eccc2014-04-01 16:20:23 +02003073 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00003074
Nick Pigginb3e19d92011-01-07 17:50:11 +11003075out:
3076 return err;
3077
3078out_mount:
3079 unregister_filesystem(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11003080 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003081}
3082
Andi Kleen77d76ea2005-12-22 12:43:42 -08003083core_initcall(sock_init); /* early initcall */
3084
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085#ifdef CONFIG_PROC_FS
3086void socket_seq_show(struct seq_file *seq)
3087{
Tonghao Zhang648845a2017-12-14 05:51:58 -08003088 seq_printf(seq, "sockets: used %d\n",
3089 sock_inuse_get(seq->private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003090}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003091#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003092
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003093#ifdef CONFIG_COMPAT
Al Viro36fd6332017-06-26 13:19:16 -04003094static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003095{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003096 struct compat_ifconf ifc32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003097 struct ifconf ifc;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003098 int err;
3099
Arnd Bergmann6b960182009-11-06 23:10:54 -08003100 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003101 return -EFAULT;
3102
Al Viro36fd6332017-06-26 13:19:16 -04003103 ifc.ifc_len = ifc32.ifc_len;
3104 ifc.ifc_req = compat_ptr(ifc32.ifcbuf);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003105
Al Viro36fd6332017-06-26 13:19:16 -04003106 rtnl_lock();
3107 err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq));
3108 rtnl_unlock();
Arnd Bergmann7a229382009-11-06 23:00:29 -08003109 if (err)
3110 return err;
3111
Al Viro36fd6332017-06-26 13:19:16 -04003112 ifc32.ifc_len = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08003113 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003114 return -EFAULT;
3115
3116 return 0;
3117}
3118
Arnd Bergmann6b960182009-11-06 23:10:54 -08003119static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003120{
Ben Hutchings3a7da392011-03-17 07:34:32 +00003121 struct compat_ethtool_rxnfc __user *compat_rxnfc;
3122 bool convert_in = false, convert_out = false;
Al Viro44c02a22017-10-05 12:59:44 -04003123 size_t buf_size = 0;
3124 struct ethtool_rxnfc __user *rxnfc = NULL;
3125 struct ifreq ifr;
Ben Hutchings3a7da392011-03-17 07:34:32 +00003126 u32 rule_cnt = 0, actual_rule_cnt;
3127 u32 ethcmd;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003128 u32 data;
Ben Hutchings3a7da392011-03-17 07:34:32 +00003129 int ret;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003130
3131 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
3132 return -EFAULT;
3133
Ben Hutchings3a7da392011-03-17 07:34:32 +00003134 compat_rxnfc = compat_ptr(data);
3135
3136 if (get_user(ethcmd, &compat_rxnfc->cmd))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003137 return -EFAULT;
3138
Ben Hutchings3a7da392011-03-17 07:34:32 +00003139 /* Most ethtool structures are defined without padding.
3140 * Unfortunately struct ethtool_rxnfc is an exception.
3141 */
3142 switch (ethcmd) {
3143 default:
3144 break;
3145 case ETHTOOL_GRXCLSRLALL:
3146 /* Buffer size is variable */
3147 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
3148 return -EFAULT;
3149 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
3150 return -ENOMEM;
3151 buf_size += rule_cnt * sizeof(u32);
Miaohe Lin7c7ab582020-08-08 16:23:10 +08003152 fallthrough;
Ben Hutchings3a7da392011-03-17 07:34:32 +00003153 case ETHTOOL_GRXRINGS:
3154 case ETHTOOL_GRXCLSRLCNT:
3155 case ETHTOOL_GRXCLSRULE:
Ben Hutchings55664f32012-01-03 12:04:51 +00003156 case ETHTOOL_SRXCLSRLINS:
Ben Hutchings3a7da392011-03-17 07:34:32 +00003157 convert_out = true;
Miaohe Lin7c7ab582020-08-08 16:23:10 +08003158 fallthrough;
Ben Hutchings3a7da392011-03-17 07:34:32 +00003159 case ETHTOOL_SRXCLSRLDEL:
Ben Hutchings3a7da392011-03-17 07:34:32 +00003160 buf_size += sizeof(struct ethtool_rxnfc);
3161 convert_in = true;
Al Viro44c02a22017-10-05 12:59:44 -04003162 rxnfc = compat_alloc_user_space(buf_size);
Ben Hutchings3a7da392011-03-17 07:34:32 +00003163 break;
3164 }
3165
Al Viro44c02a22017-10-05 12:59:44 -04003166 if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ))
Ben Hutchings3a7da392011-03-17 07:34:32 +00003167 return -EFAULT;
3168
Al Viro44c02a22017-10-05 12:59:44 -04003169 ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc;
Ben Hutchings3a7da392011-03-17 07:34:32 +00003170
3171 if (convert_in) {
Alexander Duyck127fe532011-04-08 18:01:59 +00003172 /* We expect there to be holes between fs.m_ext and
Ben Hutchings3a7da392011-03-17 07:34:32 +00003173 * fs.ring_cookie and at the end of fs, but nowhere else.
3174 */
Alexander Duyck127fe532011-04-08 18:01:59 +00003175 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
3176 sizeof(compat_rxnfc->fs.m_ext) !=
3177 offsetof(struct ethtool_rxnfc, fs.m_ext) +
3178 sizeof(rxnfc->fs.m_ext));
Ben Hutchings3a7da392011-03-17 07:34:32 +00003179 BUILD_BUG_ON(
3180 offsetof(struct compat_ethtool_rxnfc, fs.location) -
3181 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
3182 offsetof(struct ethtool_rxnfc, fs.location) -
3183 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
3184
3185 if (copy_in_user(rxnfc, compat_rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00003186 (void __user *)(&rxnfc->fs.m_ext + 1) -
3187 (void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00003188 copy_in_user(&rxnfc->fs.ring_cookie,
3189 &compat_rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00003190 (void __user *)(&rxnfc->fs.location + 1) -
Wenwen Wangb6168562018-10-18 09:36:46 -05003191 (void __user *)&rxnfc->fs.ring_cookie))
3192 return -EFAULT;
3193 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
3194 if (put_user(rule_cnt, &rxnfc->rule_cnt))
3195 return -EFAULT;
3196 } else if (copy_in_user(&rxnfc->rule_cnt,
3197 &compat_rxnfc->rule_cnt,
3198 sizeof(rxnfc->rule_cnt)))
Ben Hutchings3a7da392011-03-17 07:34:32 +00003199 return -EFAULT;
3200 }
3201
Al Viro44c02a22017-10-05 12:59:44 -04003202 ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL);
Ben Hutchings3a7da392011-03-17 07:34:32 +00003203 if (ret)
3204 return ret;
3205
3206 if (convert_out) {
3207 if (copy_in_user(compat_rxnfc, rxnfc,
Stephen Hemminger954b1242013-02-11 06:22:28 +00003208 (const void __user *)(&rxnfc->fs.m_ext + 1) -
3209 (const void __user *)rxnfc) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00003210 copy_in_user(&compat_rxnfc->fs.ring_cookie,
3211 &rxnfc->fs.ring_cookie,
Stephen Hemminger954b1242013-02-11 06:22:28 +00003212 (const void __user *)(&rxnfc->fs.location + 1) -
3213 (const void __user *)&rxnfc->fs.ring_cookie) ||
Ben Hutchings3a7da392011-03-17 07:34:32 +00003214 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
3215 sizeof(rxnfc->rule_cnt)))
3216 return -EFAULT;
3217
3218 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
3219 /* As an optimisation, we only copy the actual
3220 * number of rules that the underlying
3221 * function returned. Since Mallory might
3222 * change the rule count in user memory, we
3223 * check that it is less than the rule count
3224 * originally given (as the user buffer size),
3225 * which has been range-checked.
3226 */
3227 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
3228 return -EFAULT;
3229 if (actual_rule_cnt < rule_cnt)
3230 rule_cnt = actual_rule_cnt;
3231 if (copy_in_user(&compat_rxnfc->rule_locs[0],
3232 &rxnfc->rule_locs[0],
3233 rule_cnt * sizeof(u32)))
3234 return -EFAULT;
3235 }
3236 }
3237
3238 return 0;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003239}
3240
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003241static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
3242{
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003243 compat_uptr_t uptr32;
Al Viro44c02a22017-10-05 12:59:44 -04003244 struct ifreq ifr;
3245 void __user *saved;
3246 int err;
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003247
Al Viro44c02a22017-10-05 12:59:44 -04003248 if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003249 return -EFAULT;
3250
3251 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
3252 return -EFAULT;
3253
Al Viro44c02a22017-10-05 12:59:44 -04003254 saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc;
3255 ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003256
Al Viro44c02a22017-10-05 12:59:44 -04003257 err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL);
3258 if (!err) {
3259 ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved;
3260 if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq)))
3261 err = -EFAULT;
Joe Perchesccbd6a52010-05-14 10:58:26 +00003262 }
Al Viro44c02a22017-10-05 12:59:44 -04003263 return err;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003264}
3265
Ben Hutchings590d4692013-11-18 17:04:13 +00003266/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3267static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08003268 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003269{
Al Viro44c02a22017-10-05 12:59:44 -04003270 struct ifreq ifreq;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003271 u32 data32;
3272
Al Viro44c02a22017-10-05 12:59:44 -04003273 if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003274 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04003275 if (get_user(data32, &u_ifreq32->ifr_data))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003276 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04003277 ifreq.ifr_data = compat_ptr(data32);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003278
Al Viro44c02a22017-10-05 12:59:44 -04003279 return dev_ioctl(net, cmd, &ifreq, NULL);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003280}
3281
Johannes Berg37ac39b2019-01-25 22:43:18 +01003282static int compat_ifreq_ioctl(struct net *net, struct socket *sock,
3283 unsigned int cmd,
3284 struct compat_ifreq __user *uifr32)
3285{
3286 struct ifreq __user *uifr;
3287 int err;
3288
3289 /* Handle the fact that while struct ifreq has the same *layout* on
3290 * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
3291 * which are handled elsewhere, it still has different *size* due to
3292 * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
3293 * resulting in struct ifreq being 32 and 40 bytes respectively).
3294 * As a result, if the struct happens to be at the end of a page and
3295 * the next page isn't readable/writable, we get a fault. To prevent
3296 * that, copy back and forth to the full size.
3297 */
3298
3299 uifr = compat_alloc_user_space(sizeof(*uifr));
3300 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
3301 return -EFAULT;
3302
3303 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
3304
3305 if (!err) {
3306 switch (cmd) {
3307 case SIOCGIFFLAGS:
3308 case SIOCGIFMETRIC:
3309 case SIOCGIFMTU:
3310 case SIOCGIFMEM:
3311 case SIOCGIFHWADDR:
3312 case SIOCGIFINDEX:
3313 case SIOCGIFADDR:
3314 case SIOCGIFBRDADDR:
3315 case SIOCGIFDSTADDR:
3316 case SIOCGIFNETMASK:
3317 case SIOCGIFPFLAGS:
3318 case SIOCGIFTXQLEN:
3319 case SIOCGMIIPHY:
3320 case SIOCGMIIREG:
Johannes Bergc6c9fee2019-01-25 22:43:19 +01003321 case SIOCGIFNAME:
Johannes Berg37ac39b2019-01-25 22:43:18 +01003322 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
3323 err = -EFAULT;
3324 break;
3325 }
3326 }
3327 return err;
3328}
3329
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003330static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
3331 struct compat_ifreq __user *uifr32)
3332{
3333 struct ifreq ifr;
3334 struct compat_ifmap __user *uifmap32;
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003335 int err;
3336
3337 uifmap32 = &uifr32->ifr_ifru.ifru_map;
3338 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003339 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3340 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3341 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3342 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
3343 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
3344 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003345 if (err)
3346 return -EFAULT;
3347
Al Viro44c02a22017-10-05 12:59:44 -04003348 err = dev_ioctl(net, cmd, &ifr, NULL);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003349
3350 if (cmd == SIOCGIFMAP && !err) {
3351 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003352 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3353 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3354 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3355 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
3356 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
3357 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003358 if (err)
3359 err = -EFAULT;
3360 }
3361 return err;
3362}
3363
Arnd Bergmann7a229382009-11-06 23:00:29 -08003364/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3365 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003366 * use compatible ioctls
Arnd Bergmann7a229382009-11-06 23:00:29 -08003367 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003368static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003369{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003370 compat_ulong_t tmp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003371
Arnd Bergmann6b960182009-11-06 23:10:54 -08003372 if (get_user(tmp, argp))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003373 return -EFAULT;
3374 if (tmp == BRCTL_GET_VERSION)
3375 return BRCTL_VERSION + 1;
3376 return -EINVAL;
3377}
3378
Arnd Bergmann6b960182009-11-06 23:10:54 -08003379static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3380 unsigned int cmd, unsigned long arg)
3381{
3382 void __user *argp = compat_ptr(arg);
3383 struct sock *sk = sock->sk;
3384 struct net *net = sock_net(sk);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003385
Arnd Bergmann6b960182009-11-06 23:10:54 -08003386 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003387 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003388
Arnd Bergmann6b960182009-11-06 23:10:54 -08003389 switch (cmd) {
3390 case SIOCSIFBR:
3391 case SIOCGIFBR:
3392 return old_bridge_ioctl(argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003393 case SIOCGIFCONF:
Al Viro36fd6332017-06-26 13:19:16 -04003394 return compat_dev_ifconf(net, argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003395 case SIOCETHTOOL:
3396 return ethtool_ioctl(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003397 case SIOCWANDEV:
3398 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003399 case SIOCGIFMAP:
3400 case SIOCSIFMAP:
3401 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann0768e172019-04-17 22:56:11 +02003402 case SIOCGSTAMP_OLD:
3403 case SIOCGSTAMPNS_OLD:
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02003404 if (!sock->ops->gettstamp)
3405 return -ENOIOCTLCMD;
Arnd Bergmann0768e172019-04-17 22:56:11 +02003406 return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD,
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02003407 !COMPAT_USE_64BIT_TIME);
3408
Ben Hutchings590d4692013-11-18 17:04:13 +00003409 case SIOCBONDSLAVEINFOQUERY:
3410 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003411 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003412 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003413 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003414
Arnd Bergmann6b960182009-11-06 23:10:54 -08003415 case FIOSETOWN:
3416 case SIOCSPGRP:
3417 case FIOGETOWN:
3418 case SIOCGPGRP:
3419 case SIOCBRADDBR:
3420 case SIOCBRDELBR:
3421 case SIOCGIFVLAN:
3422 case SIOCSIFVLAN:
Andrey Vaginc62cce22016-10-24 18:29:13 -07003423 case SIOCGSKNS:
Arnd Bergmann0768e172019-04-17 22:56:11 +02003424 case SIOCGSTAMP_NEW:
3425 case SIOCGSTAMPNS_NEW:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003426 return sock_ioctl(file, cmd, arg);
3427
3428 case SIOCGIFFLAGS:
3429 case SIOCSIFFLAGS:
3430 case SIOCGIFMETRIC:
3431 case SIOCSIFMETRIC:
3432 case SIOCGIFMTU:
3433 case SIOCSIFMTU:
3434 case SIOCGIFMEM:
3435 case SIOCSIFMEM:
3436 case SIOCGIFHWADDR:
3437 case SIOCSIFHWADDR:
3438 case SIOCADDMULTI:
3439 case SIOCDELMULTI:
3440 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003441 case SIOCGIFADDR:
3442 case SIOCSIFADDR:
3443 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003444 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003445 case SIOCGIFBRDADDR:
3446 case SIOCSIFBRDADDR:
3447 case SIOCGIFDSTADDR:
3448 case SIOCSIFDSTADDR:
3449 case SIOCGIFNETMASK:
3450 case SIOCSIFNETMASK:
3451 case SIOCSIFPFLAGS:
3452 case SIOCGIFPFLAGS:
3453 case SIOCGIFTXQLEN:
3454 case SIOCSIFTXQLEN:
3455 case SIOCBRADDIF:
3456 case SIOCBRDELIF:
Johannes Bergc6c9fee2019-01-25 22:43:19 +01003457 case SIOCGIFNAME:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003458 case SIOCSIFNAME:
3459 case SIOCGMIIPHY:
3460 case SIOCGMIIREG:
3461 case SIOCSMIIREG:
Al Virof92d4fc2017-09-30 19:32:17 -04003462 case SIOCBONDENSLAVE:
3463 case SIOCBONDRELEASE:
3464 case SIOCBONDSETHWADDR:
3465 case SIOCBONDCHANGEACTIVE:
Johannes Berg37ac39b2019-01-25 22:43:18 +01003466 return compat_ifreq_ioctl(net, sock, cmd, argp);
3467
Arnd Bergmann6b960182009-11-06 23:10:54 -08003468 case SIOCSARP:
3469 case SIOCGARP:
3470 case SIOCDARP:
Arnd Bergmannc7dc5042019-06-03 23:07:12 +02003471 case SIOCOUTQ:
Arnd Bergmann9d7bf412019-06-03 23:06:00 +02003472 case SIOCOUTQNSD:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003473 case SIOCATMARK:
Johannes Berg63ff03a2019-01-25 22:43:17 +01003474 return sock_do_ioctl(net, sock, cmd, arg);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003475 }
3476
Arnd Bergmann6b960182009-11-06 23:10:54 -08003477 return -ENOIOCTLCMD;
3478}
Arnd Bergmann7a229382009-11-06 23:00:29 -08003479
Eric Dumazet95c96172012-04-15 05:58:06 +00003480static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003481 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003482{
3483 struct socket *sock = file->private_data;
3484 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003485 struct sock *sk;
3486 struct net *net;
3487
3488 sk = sock->sk;
3489 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003490
3491 if (sock->ops->compat_ioctl)
3492 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3493
David S. Miller87de87d2008-06-03 09:14:03 -07003494 if (ret == -ENOIOCTLCMD &&
3495 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3496 ret = compat_wext_handle_ioctl(net, cmd, arg);
3497
Arnd Bergmann6b960182009-11-06 23:10:54 -08003498 if (ret == -ENOIOCTLCMD)
3499 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3500
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003501 return ret;
3502}
3503#endif
3504
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003505/**
3506 * kernel_bind - bind an address to a socket (kernel space)
3507 * @sock: socket
3508 * @addr: address
3509 * @addrlen: length of address
3510 *
3511 * Returns 0 or an error.
3512 */
3513
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003514int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3515{
3516 return sock->ops->bind(sock, addr, addrlen);
3517}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003518EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003519
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003520/**
3521 * kernel_listen - move socket to listening state (kernel space)
3522 * @sock: socket
3523 * @backlog: pending connections queue size
3524 *
3525 * Returns 0 or an error.
3526 */
3527
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003528int kernel_listen(struct socket *sock, int backlog)
3529{
3530 return sock->ops->listen(sock, backlog);
3531}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003532EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003533
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003534/**
3535 * kernel_accept - accept a connection (kernel space)
3536 * @sock: listening socket
3537 * @newsock: new connected socket
3538 * @flags: flags
3539 *
3540 * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0.
3541 * If it fails, @newsock is guaranteed to be %NULL.
3542 * Returns 0 or an error.
3543 */
3544
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003545int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3546{
3547 struct sock *sk = sock->sk;
3548 int err;
3549
3550 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3551 newsock);
3552 if (err < 0)
3553 goto done;
3554
David Howellscdfbabf2017-03-09 08:09:05 +00003555 err = sock->ops->accept(sock, *newsock, flags, true);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003556 if (err < 0) {
3557 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003558 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003559 goto done;
3560 }
3561
3562 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003563 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003564
3565done:
3566 return err;
3567}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003568EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003569
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003570/**
3571 * kernel_connect - connect a socket (kernel space)
3572 * @sock: socket
3573 * @addr: address
3574 * @addrlen: address length
3575 * @flags: flags (O_NONBLOCK, ...)
3576 *
3577 * For datagram sockets, @addr is the addres to which datagrams are sent
3578 * by default, and the only address from which datagrams are received.
3579 * For stream sockets, attempts to connect to @addr.
3580 * Returns 0 or an error code.
3581 */
3582
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003583int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003584 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003585{
3586 return sock->ops->connect(sock, addr, addrlen, flags);
3587}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003588EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003589
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003590/**
3591 * kernel_getsockname - get the address which the socket is bound (kernel space)
3592 * @sock: socket
3593 * @addr: address holder
3594 *
3595 * Fills the @addr pointer with the address which the socket is bound.
3596 * Returns 0 or an error code.
3597 */
3598
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003599int kernel_getsockname(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003600{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003601 return sock->ops->getname(sock, addr, 0);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003602}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003603EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003604
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003605/**
Miaohe Lin645f0892020-08-27 07:27:49 -04003606 * kernel_getpeername - get the address which the socket is connected (kernel space)
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003607 * @sock: socket
3608 * @addr: address holder
3609 *
3610 * Fills the @addr pointer with the address which the socket is connected.
3611 * Returns 0 or an error code.
3612 */
3613
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003614int kernel_getpeername(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003615{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003616 return sock->ops->getname(sock, addr, 1);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003617}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003618EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003619
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003620/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003621 * kernel_sendpage - send a &page through a socket (kernel space)
3622 * @sock: socket
3623 * @page: page
3624 * @offset: page offset
3625 * @size: total size in bytes
3626 * @flags: flags (MSG_DONTWAIT, ...)
3627 *
3628 * Returns the total amount sent in bytes or an error.
3629 */
3630
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003631int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3632 size_t size, int flags)
3633{
Coly Li7b62d312020-10-02 16:27:29 +08003634 if (sock->ops->sendpage) {
3635 /* Warn in case the improper page to zero-copy send */
3636 WARN_ONCE(!sendpage_ok(page), "improper page for zero-copy send");
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003637 return sock->ops->sendpage(sock, page, offset, size, flags);
Coly Li7b62d312020-10-02 16:27:29 +08003638 }
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003639 return sock_no_sendpage(sock, page, offset, size, flags);
3640}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003641EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003642
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003643/**
3644 * kernel_sendpage_locked - send a &page through the locked sock (kernel space)
3645 * @sk: sock
3646 * @page: page
3647 * @offset: page offset
3648 * @size: total size in bytes
3649 * @flags: flags (MSG_DONTWAIT, ...)
3650 *
3651 * Returns the total amount sent in bytes or an error.
3652 * Caller must hold @sk.
3653 */
3654
Tom Herbert306b13e2017-07-28 16:22:41 -07003655int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
3656 size_t size, int flags)
3657{
3658 struct socket *sock = sk->sk_socket;
3659
3660 if (sock->ops->sendpage_locked)
3661 return sock->ops->sendpage_locked(sk, page, offset, size,
3662 flags);
3663
3664 return sock_no_sendpage_locked(sk, page, offset, size, flags);
3665}
3666EXPORT_SYMBOL(kernel_sendpage_locked);
3667
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003668/**
Miaohe Lin645f0892020-08-27 07:27:49 -04003669 * kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space)
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003670 * @sock: socket
3671 * @how: connection part
3672 *
3673 * Returns 0 or an error.
3674 */
3675
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003676int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3677{
3678 return sock->ops->shutdown(sock, how);
3679}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003680EXPORT_SYMBOL(kernel_sock_shutdown);
R. Parameswaran113c3072017-04-05 16:50:35 -07003681
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003682/**
3683 * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
3684 * @sk: socket
3685 *
3686 * This routine returns the IP overhead imposed by a socket i.e.
3687 * the length of the underlying IP header, depending on whether
3688 * this is an IPv4 or IPv6 socket and the length from IP options turned
3689 * on at the socket. Assumes that the caller has a lock on the socket.
R. Parameswaran113c3072017-04-05 16:50:35 -07003690 */
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003691
R. Parameswaran113c3072017-04-05 16:50:35 -07003692u32 kernel_sock_ip_overhead(struct sock *sk)
3693{
3694 struct inet_sock *inet;
3695 struct ip_options_rcu *opt;
3696 u32 overhead = 0;
R. Parameswaran113c3072017-04-05 16:50:35 -07003697#if IS_ENABLED(CONFIG_IPV6)
3698 struct ipv6_pinfo *np;
3699 struct ipv6_txoptions *optv6 = NULL;
3700#endif /* IS_ENABLED(CONFIG_IPV6) */
3701
3702 if (!sk)
3703 return overhead;
3704
R. Parameswaran113c3072017-04-05 16:50:35 -07003705 switch (sk->sk_family) {
3706 case AF_INET:
3707 inet = inet_sk(sk);
3708 overhead += sizeof(struct iphdr);
3709 opt = rcu_dereference_protected(inet->inet_opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003710 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003711 if (opt)
3712 overhead += opt->opt.optlen;
3713 return overhead;
3714#if IS_ENABLED(CONFIG_IPV6)
3715 case AF_INET6:
3716 np = inet6_sk(sk);
3717 overhead += sizeof(struct ipv6hdr);
3718 if (np)
3719 optv6 = rcu_dereference_protected(np->opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003720 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003721 if (optv6)
3722 overhead += (optv6->opt_flen + optv6->opt_nflen);
3723 return overhead;
3724#endif /* IS_ENABLED(CONFIG_IPV6) */
3725 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
3726 return overhead;
3727 }
3728}
3729EXPORT_SYMBOL(kernel_sock_ip_overhead);