blob: de89ab55d47598d87db3a2fb4659496abfd5aae0 [file] [log] [blame]
Thomas Gleixner2874c5f2019-05-27 08:55:01 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * NET An implementation of the SOCKET network access protocol.
4 *
5 * Version: @(#)socket.c 1.1.93 18/02/95
6 *
7 * Authors: Orest Zborowski, <obz@Kodak.COM>
Jesper Juhl02c30a82005-05-05 16:16:16 -07008 * Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 *
11 * Fixes:
12 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
13 * shutdown()
14 * Alan Cox : verify_area() fixes
15 * Alan Cox : Removed DDI
16 * Jonathan Kamens : SOCK_DGRAM reconnect bug
17 * Alan Cox : Moved a load of checks to the very
18 * top level.
19 * Alan Cox : Move address structures to/from user
20 * mode above the protocol layers.
21 * Rob Janssen : Allow 0 length sends.
22 * Alan Cox : Asynchronous I/O support (cribbed from the
23 * tty drivers).
24 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
25 * Jeff Uphoff : Made max number of sockets command-line
26 * configurable.
27 * Matti Aarnio : Made the number of sockets dynamic,
28 * to be allocated when needed, and mr.
29 * Uphoff's max is used as max to be
30 * allowed to allocate.
31 * Linus : Argh. removed all the socket allocation
32 * altogether: it's in the inode now.
33 * Alan Cox : Made sock_alloc()/sock_release() public
34 * for NetROM and future kernel nfsd type
35 * stuff.
36 * Alan Cox : sendmsg/recvmsg basics.
37 * Tom Dyas : Export net symbols.
38 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
39 * Alan Cox : Added thread locking to sys_* calls
40 * for sockets. May have errors at the
41 * moment.
42 * Kevin Buhr : Fixed the dumb errors in the above.
43 * Andi Kleen : Some small cleanups, optimizations,
44 * and fixed a copy_from_user() bug.
45 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
Stephen Hemminger89bddce2006-09-01 00:19:31 -070046 * Tigran Aivazian : Made listen(2) backlog sanity checks
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 * protocol-independent
48 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 * This module is effectively the top level interface to the BSD socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -070050 * paradigm.
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 *
52 * Based upon Swansea University Computer Society NET3.039
53 */
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <linux/socket.h>
57#include <linux/file.h>
58#include <linux/net.h>
59#include <linux/interrupt.h>
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -070060#include <linux/thread_info.h>
Stephen Hemminger55737fd2006-09-01 00:23:39 -070061#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/netdevice.h>
63#include <linux/proc_fs.h>
64#include <linux/seq_file.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080065#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#include <linux/if_bridge.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030067#include <linux/if_frad.h>
68#include <linux/if_vlan.h>
Daniel Borkmann408eccc2014-04-01 16:20:23 +020069#include <linux/ptp_classify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <linux/init.h>
71#include <linux/poll.h>
72#include <linux/cache.h>
73#include <linux/module.h>
74#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#include <linux/mount.h>
David Howellsfba9be42019-03-25 16:38:24 +000076#include <linux/pseudo_fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070077#include <linux/security.h>
78#include <linux/syscalls.h>
79#include <linux/compat.h>
80#include <linux/kmod.h>
David Woodhouse3ec3b2f2005-05-17 12:08:48 +010081#include <linux/audit.h>
Adrian Bunkd86b5e02006-01-21 00:46:55 +010082#include <linux/wireless.h>
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -070083#include <linux/nsproxy.h>
Nick Black1fd7317d2009-09-22 16:43:33 -070084#include <linux/magic.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090085#include <linux/slab.h>
Masatake YAMATO600e1772012-08-29 10:44:29 +000086#include <linux/xattr.h>
Jeremy Clinec8e8cd52018-07-27 22:43:01 +000087#include <linux/nospec.h>
Paolo Abeni8c3c4472019-05-03 17:01:39 +020088#include <linux/indirect_call_wrapper.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080090#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070091#include <asm/unistd.h>
92
93#include <net/compat.h>
David S. Miller87de87d2008-06-03 09:14:03 -070094#include <net/wext.h>
Herbert Xuf8451722010-05-24 00:12:34 -070095#include <net/cls_cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97#include <net/sock.h>
98#include <linux/netfilter.h>
99
Arnd Bergmann6b960182009-11-06 23:10:54 -0800100#include <linux/if_tun.h>
101#include <linux/ipv6_route.h>
102#include <linux/route.h>
Arnd Bergmannc7dc5042019-06-03 23:07:12 +0200103#include <linux/termios.h>
Arnd Bergmann6b960182009-11-06 23:10:54 -0800104#include <linux/sockios.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +0300105#include <net/busy_poll.h>
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400106#include <linux/errqueue.h>
Eliezer Tamir06021292013-06-10 11:39:50 +0300107
Cong Wange0d10952013-08-01 11:10:25 +0800108#ifdef CONFIG_NET_RX_BUSY_POLL
Eliezer Tamir64b0dc52013-07-10 17:13:36 +0300109unsigned int sysctl_net_busy_read __read_mostly;
110unsigned int sysctl_net_busy_poll __read_mostly;
Eliezer Tamir06021292013-06-10 11:39:50 +0300111#endif
Arnd Bergmann6b960182009-11-06 23:10:54 -0800112
Al Viro8ae5e0302014-11-28 19:40:50 -0500113static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to);
114static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700115static int sock_mmap(struct file *file, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117static int sock_close(struct inode *inode, struct file *file);
Linus Torvaldsa11e1d42018-06-28 09:43:44 -0700118static __poll_t sock_poll(struct file *file,
119 struct poll_table_struct *wait);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700120static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800121#ifdef CONFIG_COMPAT
122static long compat_sock_ioctl(struct file *file,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700123 unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800124#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125static int sock_fasync(int fd, struct file *filp, int on);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126static ssize_t sock_sendpage(struct file *file, struct page *page,
127 int offset, size_t size, loff_t *ppos, int more);
Jens Axboe9c55e012007-11-06 23:30:13 -0800128static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700129 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800130 unsigned int flags);
Arnd Bergmann542d3062020-01-08 22:44:43 +0100131
132#ifdef CONFIG_PROC_FS
133static void sock_show_fdinfo(struct seq_file *m, struct file *f)
134{
135 struct socket *sock = f->private_data;
136
137 if (sock->ops->show_fdinfo)
138 sock->ops->show_fdinfo(m, sock);
139}
140#else
141#define sock_show_fdinfo NULL
142#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144/*
145 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
146 * in the operation structures but are done directly via the socketcall() multiplexor.
147 */
148
Arjan van de Venda7071d2007-02-12 00:55:36 -0800149static const struct file_operations socket_file_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 .owner = THIS_MODULE,
151 .llseek = no_llseek,
Al Viro8ae5e0302014-11-28 19:40:50 -0500152 .read_iter = sock_read_iter,
153 .write_iter = sock_write_iter,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 .poll = sock_poll,
155 .unlocked_ioctl = sock_ioctl,
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800156#ifdef CONFIG_COMPAT
157 .compat_ioctl = compat_sock_ioctl,
158#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 .mmap = sock_mmap,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 .release = sock_close,
161 .fasync = sock_fasync,
Jens Axboe5274f052006-03-30 15:15:30 +0200162 .sendpage = sock_sendpage,
163 .splice_write = generic_splice_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800164 .splice_read = sock_splice_read,
Kirill Tkhaib4653342019-12-09 13:03:40 +0300165 .show_fdinfo = sock_show_fdinfo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166};
167
168/*
169 * The protocol list. Each protocol is registered in here.
170 */
171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172static DEFINE_SPINLOCK(net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +0000173static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700176 * Support routines.
177 * Move socket addresses back and forth across the kernel/user
178 * divide and look after the messy bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 */
180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181/**
182 * move_addr_to_kernel - copy a socket address into kernel space
183 * @uaddr: Address in user space
184 * @kaddr: Address in kernel space
185 * @ulen: Length in user space
186 *
187 * The address is copied into kernel space. If the provided address is
188 * too long an error code of -EINVAL is returned. If the copy gives
189 * invalid addresses -EFAULT is returned. On a success 0 is returned.
190 */
191
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000192int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700194 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700196 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700198 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100200 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
202
203/**
204 * move_addr_to_user - copy an address to user space
205 * @kaddr: kernel space address
206 * @klen: length of address in kernel
207 * @uaddr: user space address
208 * @ulen: pointer to user length field
209 *
210 * The value pointed to by ulen on entry is the buffer length available.
211 * This is overwritten with the buffer space used. -EINVAL is returned
212 * if an overlong buffer is specified or a negative buffer size. -EFAULT
213 * is returned if either the buffer or the length field are not
214 * accessible.
215 * After copying the data up to the limit the user specifies, the true
216 * length of the data is written over the length limit the user
217 * specified. Zero is returned for a success.
218 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700219
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000220static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
stephen hemminger11165f12010-10-18 14:27:29 +0000221 void __user *uaddr, int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
223 int err;
224 int len;
225
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100226 BUG_ON(klen > sizeof(struct sockaddr_storage));
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700227 err = get_user(len, ulen);
228 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700230 if (len > klen)
231 len = klen;
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100232 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700234 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500235 if (audit_sockaddr(klen, kaddr))
236 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700237 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 return -EFAULT;
239 }
240 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700241 * "fromlen shall refer to the value before truncation.."
242 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 */
244 return __put_user(klen, ulen);
245}
246
Alexey Dobriyan08009a72018-02-24 21:20:33 +0300247static struct kmem_cache *sock_inode_cachep __ro_after_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249static struct inode *sock_alloc_inode(struct super_block *sb)
250{
251 struct socket_alloc *ei;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700252
Christoph Lametere94b1762006-12-06 20:33:17 -0800253 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 if (!ei)
255 return NULL;
Al Viro333f7902019-07-05 20:14:16 +0100256 init_waitqueue_head(&ei->socket.wq.wait);
257 ei->socket.wq.fasync_list = NULL;
258 ei->socket.wq.flags = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700259
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 ei->socket.state = SS_UNCONNECTED;
261 ei->socket.flags = 0;
262 ei->socket.ops = NULL;
263 ei->socket.sk = NULL;
264 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266 return &ei->vfs_inode;
267}
268
Al Viro6d7855c2019-07-05 20:13:22 +0100269static void sock_free_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270{
Eric Dumazet43815482010-04-29 11:01:49 +0000271 struct socket_alloc *ei;
272
273 ei = container_of(inode, struct socket_alloc, vfs_inode);
Eric Dumazet43815482010-04-29 11:01:49 +0000274 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275}
276
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700277static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700279 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Christoph Lametera35afb82007-05-16 22:10:57 -0700281 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700283
yuan linyu1e911632017-01-07 17:18:31 +0800284static void init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285{
286 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700287 sizeof(struct socket_alloc),
288 0,
289 (SLAB_HWCACHE_ALIGN |
290 SLAB_RECLAIM_ACCOUNT |
Vladimir Davydov5d097052016-01-14 15:18:21 -0800291 SLAB_MEM_SPREAD | SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +0900292 init_once);
yuan linyu1e911632017-01-07 17:18:31 +0800293 BUG_ON(sock_inode_cachep == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294}
295
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700296static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700297 .alloc_inode = sock_alloc_inode,
Al Viro6d7855c2019-07-05 20:13:22 +0100298 .free_inode = sock_free_inode,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700299 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300};
301
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700302/*
303 * sockfs_dname() is called from d_path().
304 */
305static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
306{
307 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
David Howellsc5ef6032015-03-17 22:26:16 +0000308 d_inode(dentry)->i_ino);
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700309}
310
Al Viro3ba13d12009-02-20 06:02:22 +0000311static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700312 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313};
314
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200315static int sockfs_xattr_get(const struct xattr_handler *handler,
316 struct dentry *dentry, struct inode *inode,
317 const char *suffix, void *value, size_t size)
318{
319 if (value) {
320 if (dentry->d_name.len + 1 > size)
321 return -ERANGE;
322 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
323 }
324 return dentry->d_name.len + 1;
325}
326
327#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
328#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
329#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
330
331static const struct xattr_handler sockfs_xattr_handler = {
332 .name = XATTR_NAME_SOCKPROTONAME,
333 .get = sockfs_xattr_get,
334};
335
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100336static int sockfs_security_xattr_set(const struct xattr_handler *handler,
337 struct dentry *dentry, struct inode *inode,
338 const char *suffix, const void *value,
339 size_t size, int flags)
340{
341 /* Handled by LSM. */
342 return -EAGAIN;
343}
344
345static const struct xattr_handler sockfs_security_xattr_handler = {
346 .prefix = XATTR_SECURITY_PREFIX,
347 .set = sockfs_security_xattr_set,
348};
349
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200350static const struct xattr_handler *sockfs_xattr_handlers[] = {
351 &sockfs_xattr_handler,
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100352 &sockfs_security_xattr_handler,
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200353 NULL
354};
355
David Howellsfba9be42019-03-25 16:38:24 +0000356static int sockfs_init_fs_context(struct fs_context *fc)
Al Viroc74a1cb2011-01-12 16:59:34 -0500357{
David Howellsfba9be42019-03-25 16:38:24 +0000358 struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC);
359 if (!ctx)
360 return -ENOMEM;
361 ctx->ops = &sockfs_ops;
362 ctx->dops = &sockfs_dentry_operations;
363 ctx->xattr = sockfs_xattr_handlers;
364 return 0;
Al Viroc74a1cb2011-01-12 16:59:34 -0500365}
366
367static struct vfsmount *sock_mnt __read_mostly;
368
369static struct file_system_type sock_fs_type = {
370 .name = "sockfs",
David Howellsfba9be42019-03-25 16:38:24 +0000371 .init_fs_context = sockfs_init_fs_context,
Al Viroc74a1cb2011-01-12 16:59:34 -0500372 .kill_sb = kill_anon_super,
373};
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375/*
376 * Obtains the first available file descriptor and sets it up for use.
377 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800378 * These functions create file structures and maps them to fd space
379 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 * and file struct implicitly stored in sock->file.
381 * Note that another thread may close file descriptor before we return
382 * from this function. We use the fact that now we do not refer
383 * to socket after mapping. If one day we will need it, this
384 * function will increment ref. count on file by 1.
385 *
386 * In any case returned fd MAY BE not valid!
387 * This race condition is unavoidable
388 * with shared fd spaces, we cannot solve it inside kernel,
389 * but we take care of internal coherence yet.
390 */
391
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300392/**
393 * sock_alloc_file - Bind a &socket to a &file
394 * @sock: socket
395 * @flags: file status flags
396 * @dname: protocol name
397 *
398 * Returns the &file bound with @sock, implicitly storing it
399 * in sock->file. If dname is %NULL, sets to "".
400 * On failure the return is a ERR pointer (see linux/err.h).
401 * This function uses GFP_KERNEL internally.
402 */
403
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700404struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405{
Al Viro7cbe66b2009-08-05 19:59:08 +0400406 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800407
Al Virod93aa9d2018-06-09 09:40:05 -0400408 if (!dname)
409 dname = sock->sk ? sock->sk->sk_prot_creator->name : "";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Al Virod93aa9d2018-06-09 09:40:05 -0400411 file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname,
412 O_RDWR | (flags & O_NONBLOCK),
413 &socket_file_ops);
Viresh Kumarb5ffe632015-08-12 15:59:47 +0530414 if (IS_ERR(file)) {
Al Viro8e1611e2017-12-05 23:29:09 +0000415 sock_release(sock);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700416 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400417 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800418
419 sock->file = file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800420 file->private_data = sock;
Linus Torvaldsd8e464e2019-11-17 11:20:48 -0800421 stream_open(SOCK_INODE(sock), file);
Al Viro28407632012-08-17 23:54:15 -0400422 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800423}
Al Viro56b31d12012-08-18 00:25:51 -0400424EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800425
Al Viro56b31d12012-08-18 00:25:51 -0400426static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800427{
428 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400429 int fd = get_unused_fd_flags(flags);
Al Viroce4bb042018-01-10 18:47:05 -0500430 if (unlikely(fd < 0)) {
431 sock_release(sock);
Al Viro28407632012-08-17 23:54:15 -0400432 return fd;
Al Viroce4bb042018-01-10 18:47:05 -0500433 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800434
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700435 newfile = sock_alloc_file(sock, flags, NULL);
Enrico Weigelt4546e442019-06-05 22:58:50 +0200436 if (!IS_ERR(newfile)) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800437 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400438 return fd;
439 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400440
Al Viro28407632012-08-17 23:54:15 -0400441 put_unused_fd(fd);
442 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443}
444
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300445/**
446 * sock_from_file - Return the &socket bounded to @file.
447 * @file: file
448 * @err: pointer to an error code return
449 *
450 * On failure returns %NULL and assigns -ENOTSOCK to @err.
451 */
452
John Fastabend406a3c62012-07-20 10:39:25 +0000453struct socket *sock_from_file(struct file *file, int *err)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800454{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800455 if (file->f_op == &socket_file_ops)
456 return file->private_data; /* set in sock_map_fd */
457
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800458 *err = -ENOTSOCK;
459 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800460}
John Fastabend406a3c62012-07-20 10:39:25 +0000461EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800462
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700464 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 * @fd: file handle
466 * @err: pointer to an error code return
467 *
468 * The file handle passed in is locked and the socket it is bound
Rosen, Rami241c4662017-05-21 22:12:38 +0300469 * to is returned. If an error occurs the err pointer is overwritten
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 * with a negative errno code and NULL is returned. The function checks
471 * for both invalid handles and passing a handle which is not a socket.
472 *
473 * On a success the socket object pointer is returned.
474 */
475
476struct socket *sockfd_lookup(int fd, int *err)
477{
478 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 struct socket *sock;
480
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700481 file = fget(fd);
482 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 *err = -EBADF;
484 return NULL;
485 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700486
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800487 sock = sock_from_file(file, err);
488 if (!sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 fput(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 return sock;
491}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700492EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800494static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
495{
Al Viro00e188e2014-03-03 23:48:18 -0500496 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800497 struct socket *sock;
498
Hua Zhong36725582006-04-19 15:25:02 -0700499 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500500 if (f.file) {
501 sock = sock_from_file(f.file, err);
502 if (likely(sock)) {
Miaohe Lince787a52020-08-06 19:53:16 +0800503 *fput_needed = f.flags & FDPUT_FPUT;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800504 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500505 }
506 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800507 }
508 return NULL;
509}
510
Masatake YAMATO600e1772012-08-29 10:44:29 +0000511static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
512 size_t size)
513{
514 ssize_t len;
515 ssize_t used = 0;
516
David Howellsc5ef6032015-03-17 22:26:16 +0000517 len = security_inode_listsecurity(d_inode(dentry), buffer, size);
Masatake YAMATO600e1772012-08-29 10:44:29 +0000518 if (len < 0)
519 return len;
520 used += len;
521 if (buffer) {
522 if (size < used)
523 return -ERANGE;
524 buffer += len;
525 }
526
527 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
528 used += len;
529 if (buffer) {
530 if (size < used)
531 return -ERANGE;
532 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
533 buffer += len;
534 }
535
536 return used;
537}
538
Tobias Klauserdc647ec2017-01-10 09:30:51 +0100539static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr)
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900540{
541 int err = simple_setattr(dentry, iattr);
542
Eric Biggerse1a3a602016-12-30 17:42:32 -0600543 if (!err && (iattr->ia_valid & ATTR_UID)) {
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900544 struct socket *sock = SOCKET_I(d_inode(dentry));
545
Cong Wang6d8c50d2018-06-07 13:39:49 -0700546 if (sock->sk)
547 sock->sk->sk_uid = iattr->ia_uid;
548 else
549 err = -ENOENT;
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900550 }
551
552 return err;
553}
554
Masatake YAMATO600e1772012-08-29 10:44:29 +0000555static const struct inode_operations sockfs_inode_ops = {
Masatake YAMATO600e1772012-08-29 10:44:29 +0000556 .listxattr = sockfs_listxattr,
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900557 .setattr = sockfs_setattr,
Masatake YAMATO600e1772012-08-29 10:44:29 +0000558};
559
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300561 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700562 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 * Allocate a new inode and socket object. The two are bound together
564 * and initialised. The socket is then returned. If we are out of inodes
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300565 * NULL is returned. This functions uses GFP_KERNEL internally.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 */
567
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800568struct socket *sock_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700570 struct inode *inode;
571 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200573 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 if (!inode)
575 return NULL;
576
577 sock = SOCKET_I(inode);
578
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400579 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700580 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100581 inode->i_uid = current_fsuid();
582 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000583 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 return sock;
586}
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800587EXPORT_SYMBOL(sock_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
Cong Wang6d8c50d2018-06-07 13:39:49 -0700589static void __sock_release(struct socket *sock, struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590{
591 if (sock->ops) {
592 struct module *owner = sock->ops->owner;
593
Cong Wang6d8c50d2018-06-07 13:39:49 -0700594 if (inode)
595 inode_lock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 sock->ops->release(sock);
Eric Biggersff7b11a2019-02-21 14:13:56 -0800597 sock->sk = NULL;
Cong Wang6d8c50d2018-06-07 13:39:49 -0700598 if (inode)
599 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 sock->ops = NULL;
601 module_put(owner);
602 }
603
Al Viro333f7902019-07-05 20:14:16 +0100604 if (sock->wq.fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800605 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 if (!sock->file) {
608 iput(SOCK_INODE(sock));
609 return;
610 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700611 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612}
Cong Wang6d8c50d2018-06-07 13:39:49 -0700613
Andrew Lunn9a8ad9a2020-07-13 01:15:12 +0200614/**
615 * sock_release - close a socket
616 * @sock: socket to close
617 *
618 * The socket is released from the protocol stack if it has a release
619 * callback, and the inode is then released if the socket is bound to
620 * an inode not a file.
621 */
Cong Wang6d8c50d2018-06-07 13:39:49 -0700622void sock_release(struct socket *sock)
623{
624 __sock_release(sock, NULL);
625}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700626EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400628void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000629{
Eric Dumazet140c55d2014-08-06 11:49:29 +0200630 u8 flags = *tx_flags;
631
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400632 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200633 flags |= SKBTX_HW_TSTAMP;
634
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400635 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200636 flags |= SKBTX_SW_TSTAMP;
637
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400638 if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200639 flags |= SKBTX_SCHED_TSTAMP;
640
Eric Dumazet140c55d2014-08-06 11:49:29 +0200641 *tx_flags = flags;
Patrick Ohly20d49472009-02-12 05:03:38 +0000642}
Willem de Bruijn67cc0d42014-09-08 19:58:58 -0400643EXPORT_SYMBOL(__sock_tx_timestamp);
Patrick Ohly20d49472009-02-12 05:03:38 +0000644
Paolo Abeni8c3c4472019-05-03 17:01:39 +0200645INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *,
646 size_t));
Paolo Abenia648a592019-07-03 16:06:54 +0200647INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *,
648 size_t));
Al Virod8725c82014-12-11 00:02:50 -0500649static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650{
Paolo Abenia648a592019-07-03 16:06:54 +0200651 int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg,
652 inet_sendmsg, sock, msg,
653 msg_data_left(msg));
Al Virod8725c82014-12-11 00:02:50 -0500654 BUG_ON(ret == -EIOCBQUEUED);
655 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656}
Gu Zheng0cf00c62014-12-05 15:14:23 +0800657
Jordan Rife81d03e22023-09-21 18:46:41 -0500658static int __sock_sendmsg(struct socket *sock, struct msghdr *msg)
659{
660 int err = security_socket_sendmsg(sock, msg,
661 msg_data_left(msg));
662
663 return err ?: sock_sendmsg_nosec(sock, msg);
664}
665
Randy Dunlap85806af2019-05-18 21:23:07 -0700666/**
667 * sock_sendmsg - send a message through @sock
668 * @sock: socket
669 * @msg: message to send
670 *
671 * Sends @msg through @sock, passing through LSM.
672 * Returns the number of bytes sent, or an error code.
673 */
Al Virod8725c82014-12-11 00:02:50 -0500674int sock_sendmsg(struct socket *sock, struct msghdr *msg)
Gu Zheng0cf00c62014-12-05 15:14:23 +0800675{
Jordan Rife81d03e22023-09-21 18:46:41 -0500676 struct sockaddr_storage *save_addr = (struct sockaddr_storage *)msg->msg_name;
677 struct sockaddr_storage address;
678 int ret;
Ying Xue1b784142015-03-02 15:37:48 +0800679
Jordan Rife81d03e22023-09-21 18:46:41 -0500680 if (msg->msg_name) {
681 memcpy(&address, msg->msg_name, msg->msg_namelen);
682 msg->msg_name = &address;
683 }
684
685 ret = __sock_sendmsg(sock, msg);
686 msg->msg_name = save_addr;
687
688 return ret;
Gu Zheng0cf00c62014-12-05 15:14:23 +0800689}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700690EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300692/**
693 * kernel_sendmsg - send a message through @sock (kernel-space)
694 * @sock: socket
695 * @msg: message header
696 * @vec: kernel vec
697 * @num: vec array length
698 * @size: total message data size
699 *
700 * Builds the message data with @vec and sends it through @sock.
701 * Returns the number of bytes sent, or an error code.
702 */
703
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
705 struct kvec *vec, size_t num, size_t size)
706{
David Howellsaa563d72018-10-20 00:57:56 +0100707 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Al Virod8725c82014-12-11 00:02:50 -0500708 return sock_sendmsg(sock, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700710EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300712/**
713 * kernel_sendmsg_locked - send a message through @sock (kernel-space)
714 * @sk: sock
715 * @msg: message header
716 * @vec: output s/g array
717 * @num: output s/g array length
718 * @size: total message data size
719 *
720 * Builds the message data with @vec and sends it through @sock.
721 * Returns the number of bytes sent, or an error code.
722 * Caller must hold @sk.
723 */
724
Tom Herbert306b13e2017-07-28 16:22:41 -0700725int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
726 struct kvec *vec, size_t num, size_t size)
727{
728 struct socket *sock = sk->sk_socket;
729
730 if (!sock->ops->sendmsg_locked)
John Fastabenddb5980d2017-08-15 22:31:34 -0700731 return sock_no_sendmsg_locked(sk, msg, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700732
David Howellsaa563d72018-10-20 00:57:56 +0100733 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700734
735 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
736}
737EXPORT_SYMBOL(kernel_sendmsg_locked);
738
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400739static bool skb_is_err_queue(const struct sk_buff *skb)
740{
741 /* pkt_type of skbs enqueued on the error queue are set to
742 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
743 * in recvmsg, since skbs received on a local socket will never
744 * have a pkt_type of PACKET_OUTGOING.
745 */
746 return skb->pkt_type == PACKET_OUTGOING;
747}
748
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200749/* On transmit, software and hardware timestamps are returned independently.
750 * As the two skb clones share the hardware timestamp, which may be updated
751 * before the software timestamp is received, a hardware TX timestamp may be
752 * returned only if there is no software TX timestamp. Ignore false software
753 * timestamps, which may be made in the __sock_recv_timestamp() call when the
Deepa Dinamani7f1bc6e2019-02-02 07:34:46 -0800754 * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200755 * hardware timestamp.
756 */
757static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
758{
759 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb);
760}
761
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200762static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb)
763{
764 struct scm_ts_pktinfo ts_pktinfo;
765 struct net_device *orig_dev;
766
767 if (!skb_mac_header_was_set(skb))
768 return;
769
770 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo));
771
772 rcu_read_lock();
773 orig_dev = dev_get_by_napi_id(skb_napi_id(skb));
774 if (orig_dev)
775 ts_pktinfo.if_index = orig_dev->ifindex;
776 rcu_read_unlock();
777
778 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb);
779 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
780 sizeof(ts_pktinfo), &ts_pktinfo);
781}
782
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700783/*
784 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
785 */
786void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
787 struct sk_buff *skb)
788{
Patrick Ohly20d49472009-02-12 05:03:38 +0000789 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Deepa Dinamani887feae2019-02-02 07:34:50 -0800790 int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW);
Deepa Dinamani97184752019-02-02 07:34:51 -0800791 struct scm_timestamping_internal tss;
792
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200793 int empty = 1, false_tstamp = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000794 struct skb_shared_hwtstamps *shhwtstamps =
795 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700796
Patrick Ohly20d49472009-02-12 05:03:38 +0000797 /* Race occurred between timestamp enabling and packet
798 receiving. Fill in the current time for now. */
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200799 if (need_software_tstamp && skb->tstamp == 0) {
Patrick Ohly20d49472009-02-12 05:03:38 +0000800 __net_timestamp(skb);
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200801 false_tstamp = 1;
802 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000803
804 if (need_software_tstamp) {
805 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800806 if (new_tstamp) {
807 struct __kernel_sock_timeval tv;
808
809 skb_get_new_timestamp(skb, &tv);
810 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
811 sizeof(tv), &tv);
812 } else {
813 struct __kernel_old_timeval tv;
814
815 skb_get_timestamp(skb, &tv);
816 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
817 sizeof(tv), &tv);
818 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000819 } else {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800820 if (new_tstamp) {
821 struct __kernel_timespec ts;
822
823 skb_get_new_timestampns(skb, &ts);
824 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
825 sizeof(ts), &ts);
826 } else {
Arnd Bergmanndf1b4ba2019-10-25 22:04:46 +0200827 struct __kernel_old_timespec ts;
Deepa Dinamani887feae2019-02-02 07:34:50 -0800828
829 skb_get_timestampns(skb, &ts);
830 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
831 sizeof(ts), &ts);
832 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000833 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700834 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000835
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400836 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400837 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Deepa Dinamani97184752019-02-02 07:34:51 -0800838 ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000839 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400840 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400841 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200842 !skb_is_swtx_tstamp(skb, false_tstamp) &&
Deepa Dinamani97184752019-02-02 07:34:51 -0800843 ktime_to_timespec64_cond(shhwtstamps->hwtstamp, tss.ts + 2)) {
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400844 empty = 0;
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200845 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&
846 !skb_is_err_queue(skb))
847 put_ts_pktinfo(msg, skb);
848 }
Francis Yan1c885802016-11-27 23:07:18 -0800849 if (!empty) {
Deepa Dinamani97184752019-02-02 07:34:51 -0800850 if (sock_flag(sk, SOCK_TSTAMP_NEW))
851 put_cmsg_scm_timestamping64(msg, &tss);
852 else
853 put_cmsg_scm_timestamping(msg, &tss);
Francis Yan1c885802016-11-27 23:07:18 -0800854
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400855 if (skb_is_err_queue(skb) && skb->len &&
Soheil Hassas Yeganeh4ef1b282017-03-18 17:03:00 -0400856 SKB_EXT_ERR(skb)->opt_stats)
Francis Yan1c885802016-11-27 23:07:18 -0800857 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
858 skb->len, skb->data);
859 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700860}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300861EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
862
Johannes Berg6e3e9392011-11-09 10:15:42 +0100863void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
864 struct sk_buff *skb)
865{
866 int ack;
867
868 if (!sock_flag(sk, SOCK_WIFI_STATUS))
869 return;
870 if (!skb->wifi_acked_valid)
871 return;
872
873 ack = skb->wifi_acked;
874
875 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
876}
877EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
878
stephen hemminger11165f12010-10-18 14:27:29 +0000879static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
880 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700881{
Eyal Birger744d5a32015-03-01 14:58:31 +0200882 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
Neil Horman3b885782009-10-12 13:26:31 -0700883 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
Eyal Birger744d5a32015-03-01 14:58:31 +0200884 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
Neil Horman3b885782009-10-12 13:26:31 -0700885}
886
Eric Dumazet767dd032010-04-28 19:14:43 +0000887void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700888 struct sk_buff *skb)
889{
890 sock_recv_timestamp(msg, sk, skb);
891 sock_recv_drops(msg, sk, skb);
892}
Eric Dumazet767dd032010-04-28 19:14:43 +0000893EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700894
Paolo Abeni8c3c4472019-05-03 17:01:39 +0200895INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *,
Paolo Abenia648a592019-07-03 16:06:54 +0200896 size_t, int));
897INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *,
898 size_t, int));
Ying Xue1b784142015-03-02 15:37:48 +0800899static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
Al Viro2da62902015-03-14 21:13:46 -0400900 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901{
Paolo Abenia648a592019-07-03 16:06:54 +0200902 return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg,
903 inet_recvmsg, sock, msg, msg_data_left(msg),
904 flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
906
Randy Dunlap85806af2019-05-18 21:23:07 -0700907/**
908 * sock_recvmsg - receive a message from @sock
909 * @sock: socket
910 * @msg: message to receive
911 * @flags: message flags
912 *
913 * Receives @msg from @sock, passing through LSM. Returns the total number
914 * of bytes received, or an error.
915 */
Al Viro2da62902015-03-14 21:13:46 -0400916int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700917{
Al Viro2da62902015-03-14 21:13:46 -0400918 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700919
Al Viro2da62902015-03-14 21:13:46 -0400920 return err ?: sock_recvmsg_nosec(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700922EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
Martin Lucinac1249c02010-12-10 00:04:05 +0000924/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300925 * kernel_recvmsg - Receive a message from a socket (kernel space)
926 * @sock: The socket to receive the message from
927 * @msg: Received message
928 * @vec: Input s/g array for message data
929 * @num: Size of input s/g array
930 * @size: Number of bytes to read
931 * @flags: Message flags (MSG_DONTWAIT, etc...)
Martin Lucinac1249c02010-12-10 00:04:05 +0000932 *
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300933 * On return the msg structure contains the scatter/gather array passed in the
934 * vec argument. The array is modified so that it consists of the unfilled
935 * portion of the original array.
Martin Lucinac1249c02010-12-10 00:04:05 +0000936 *
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300937 * The returned value is the total number of bytes received, or an error.
Martin Lucinac1249c02010-12-10 00:04:05 +0000938 */
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300939
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700940int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
941 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942{
Christoph Hellwig1f466e12020-05-11 13:59:13 +0200943 msg->msg_control_is_user = false;
David Howellsaa563d72018-10-20 00:57:56 +0100944 iov_iter_kvec(&msg->msg_iter, READ, vec, num, size);
Christoph Hellwig1f466e12020-05-11 13:59:13 +0200945 return sock_recvmsg(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700947EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300949static ssize_t sock_sendpage(struct file *file, struct page *page,
950 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951{
952 struct socket *sock;
953 int flags;
954
Eric Dumazetb69aee02005-09-06 14:42:45 -0700955 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956
Eric Dumazet35f9c092012-04-05 03:05:35 +0000957 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
958 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
959 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960
Linus Torvaldse6949582009-08-13 08:28:36 -0700961 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962}
963
Jens Axboe9c55e012007-11-06 23:30:13 -0800964static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700965 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800966 unsigned int flags)
967{
968 struct socket *sock = file->private_data;
969
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800970 if (unlikely(!sock->ops->splice_read))
Slavomir Kaslev95506582018-11-16 11:27:53 +0200971 return generic_file_splice_read(file, ppos, pipe, len, flags);
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -0800972
Jens Axboe9c55e012007-11-06 23:30:13 -0800973 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
974}
975
Al Viro8ae5e0302014-11-28 19:40:50 -0500976static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800977{
Al Viro6d652332015-01-30 16:12:56 -0500978 struct file *file = iocb->ki_filp;
979 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -0700980 struct msghdr msg = {.msg_iter = *to,
981 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -0500982 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800983
Jens Axboeebfcd892019-12-09 20:58:56 -0700984 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
Al Viro8ae5e0302014-11-28 19:40:50 -0500985 msg.msg_flags = MSG_DONTWAIT;
986
987 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800988 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700989
Christoph Hellwig66ee59a2015-02-11 19:56:46 +0100990 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800991 return 0;
992
Al Viro2da62902015-03-14 21:13:46 -0400993 res = sock_recvmsg(sock, &msg, msg.msg_flags);
Al Viro8ae5e0302014-11-28 19:40:50 -0500994 *to = msg.msg_iter;
995 return res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -0800996}
997
Al Viro8ae5e0302014-11-28 19:40:50 -0500998static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999{
Al Viro6d652332015-01-30 16:12:56 -05001000 struct file *file = iocb->ki_filp;
1001 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07001002 struct msghdr msg = {.msg_iter = *from,
1003 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -05001004 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001005
Al Viro8ae5e0302014-11-28 19:40:50 -05001006 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001007 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -07001008
Jens Axboeebfcd892019-12-09 20:58:56 -07001009 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
Al Viro8ae5e0302014-11-28 19:40:50 -05001010 msg.msg_flags = MSG_DONTWAIT;
1011
Al Viro6d652332015-01-30 16:12:56 -05001012 if (sock->type == SOCK_SEQPACKET)
1013 msg.msg_flags |= MSG_EOR;
1014
Jordan Rife81d03e22023-09-21 18:46:41 -05001015 res = __sock_sendmsg(sock, &msg);
Al Viro8ae5e0302014-11-28 19:40:50 -05001016 *from = msg.msg_iter;
1017 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018}
1019
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020/*
1021 * Atomic setting of ioctl hooks to avoid race
1022 * with module unload.
1023 */
1024
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001025static DEFINE_MUTEX(br_ioctl_mutex);
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001026static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027
Eric W. Biederman881d9662007-09-17 11:56:21 -07001028void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001030 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001032 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033}
1034EXPORT_SYMBOL(brioctl_set);
1035
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001036static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -07001037static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038
Eric W. Biederman881d9662007-09-17 11:56:21 -07001039void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001041 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001043 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044}
1045EXPORT_SYMBOL(vlan_ioctl_set);
1046
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001047static DEFINE_MUTEX(dlci_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001048static int (*dlci_ioctl_hook) (unsigned int, void __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001050void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001052 mutex_lock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 dlci_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001054 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055}
1056EXPORT_SYMBOL(dlci_ioctl_set);
1057
Arnd Bergmann6b960182009-11-06 23:10:54 -08001058static long sock_do_ioctl(struct net *net, struct socket *sock,
Johannes Berg63ff03a2019-01-25 22:43:17 +01001059 unsigned int cmd, unsigned long arg)
Arnd Bergmann6b960182009-11-06 23:10:54 -08001060{
1061 int err;
1062 void __user *argp = (void __user *)arg;
1063
1064 err = sock->ops->ioctl(sock, cmd, arg);
1065
1066 /*
1067 * If this ioctl is unknown try to hand it down
1068 * to the NIC driver.
1069 */
Al Viro36fd6332017-06-26 13:19:16 -04001070 if (err != -ENOIOCTLCMD)
1071 return err;
Arnd Bergmann6b960182009-11-06 23:10:54 -08001072
Al Viro36fd6332017-06-26 13:19:16 -04001073 if (cmd == SIOCGIFCONF) {
1074 struct ifconf ifc;
1075 if (copy_from_user(&ifc, argp, sizeof(struct ifconf)))
1076 return -EFAULT;
1077 rtnl_lock();
1078 err = dev_ifconf(net, &ifc, sizeof(struct ifreq));
1079 rtnl_unlock();
1080 if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf)))
1081 err = -EFAULT;
Peter Collingbourne1890ee72021-08-26 12:46:01 -07001082 } else if (is_socket_ioctl_cmd(cmd)) {
Al Viro44c02a22017-10-05 12:59:44 -04001083 struct ifreq ifr;
1084 bool need_copyout;
Johannes Berg63ff03a2019-01-25 22:43:17 +01001085 if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
Al Viro44c02a22017-10-05 12:59:44 -04001086 return -EFAULT;
1087 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
1088 if (!err && need_copyout)
Johannes Berg63ff03a2019-01-25 22:43:17 +01001089 if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
Al Viro44c02a22017-10-05 12:59:44 -04001090 return -EFAULT;
Peter Collingbourne1890ee72021-08-26 12:46:01 -07001091 } else {
1092 err = -ENOTTY;
Al Viro36fd6332017-06-26 13:19:16 -04001093 }
Arnd Bergmann6b960182009-11-06 23:10:54 -08001094 return err;
1095}
1096
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097/*
1098 * With an ioctl, arg may well be a user mode pointer, but we don't know
1099 * what to do with it - that's up to the protocol still.
1100 */
1101
1102static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1103{
1104 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001105 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 void __user *argp = (void __user *)arg;
1107 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001108 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109
Eric Dumazetb69aee02005-09-06 14:42:45 -07001110 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001111 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001112 net = sock_net(sk);
Al Viro44c02a22017-10-05 12:59:44 -04001113 if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
1114 struct ifreq ifr;
1115 bool need_copyout;
1116 if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
1117 return -EFAULT;
1118 err = dev_ioctl(net, cmd, &ifr, &need_copyout);
1119 if (!err && need_copyout)
1120 if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
1121 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001123#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Al Virob1b0c242017-10-01 20:13:08 -04001125 err = wext_handle_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001127#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001128 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 case FIOSETOWN:
1130 case SIOCSPGRP:
1131 err = -EFAULT;
1132 if (get_user(pid, (int __user *)argp))
1133 break;
Jiri Slaby393cc3f2017-06-13 13:35:50 +02001134 err = f_setown(sock->file, pid, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 break;
1136 case FIOGETOWN:
1137 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001138 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001139 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 break;
1141 case SIOCGIFBR:
1142 case SIOCSIFBR:
1143 case SIOCBRADDBR:
1144 case SIOCBRDELBR:
1145 err = -ENOPKG;
1146 if (!br_ioctl_hook)
1147 request_module("bridge");
1148
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001149 mutex_lock(&br_ioctl_mutex);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001150 if (br_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001151 err = br_ioctl_hook(net, cmd, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001152 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 break;
1154 case SIOCGIFVLAN:
1155 case SIOCSIFVLAN:
1156 err = -ENOPKG;
1157 if (!vlan_ioctl_hook)
1158 request_module("8021q");
1159
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001160 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001162 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001163 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 case SIOCADDDLCI:
1166 case SIOCDELDLCI:
1167 err = -ENOPKG;
1168 if (!dlci_ioctl_hook)
1169 request_module("dlci");
1170
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001171 mutex_lock(&dlci_ioctl_mutex);
1172 if (dlci_ioctl_hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 err = dlci_ioctl_hook(cmd, argp);
Pavel Emelyanov7512cbf2008-03-21 15:58:52 -07001174 mutex_unlock(&dlci_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 break;
Andrey Vaginc62cce22016-10-24 18:29:13 -07001176 case SIOCGSKNS:
1177 err = -EPERM;
1178 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1179 break;
1180
1181 err = open_related_ns(&net->ns, get_net_ns);
1182 break;
Arnd Bergmann0768e172019-04-17 22:56:11 +02001183 case SIOCGSTAMP_OLD:
1184 case SIOCGSTAMPNS_OLD:
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02001185 if (!sock->ops->gettstamp) {
1186 err = -ENOIOCTLCMD;
1187 break;
1188 }
1189 err = sock->ops->gettstamp(sock, argp,
Arnd Bergmann0768e172019-04-17 22:56:11 +02001190 cmd == SIOCGSTAMP_OLD,
1191 !IS_ENABLED(CONFIG_64BIT));
Gustavo A. R. Silva60747822019-04-24 10:31:24 -05001192 break;
Arnd Bergmann0768e172019-04-17 22:56:11 +02001193 case SIOCGSTAMP_NEW:
1194 case SIOCGSTAMPNS_NEW:
1195 if (!sock->ops->gettstamp) {
1196 err = -ENOIOCTLCMD;
1197 break;
1198 }
1199 err = sock->ops->gettstamp(sock, argp,
1200 cmd == SIOCGSTAMP_NEW,
1201 false);
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02001202 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 default:
Johannes Berg63ff03a2019-01-25 22:43:17 +01001204 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001206 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 return err;
1208}
1209
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001210/**
1211 * sock_create_lite - creates a socket
1212 * @family: protocol family (AF_INET, ...)
1213 * @type: communication type (SOCK_STREAM, ...)
1214 * @protocol: protocol (0, ...)
1215 * @res: new socket
1216 *
1217 * Creates a new socket and assigns it to @res, passing through LSM.
1218 * The new socket initialization is not complete, see kernel_accept().
1219 * Returns 0 or an error. On failure @res is set to %NULL.
1220 * This function internally uses GFP_KERNEL.
1221 */
1222
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223int sock_create_lite(int family, int type, int protocol, struct socket **res)
1224{
1225 int err;
1226 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001227
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 err = security_socket_create(family, type, protocol, 1);
1229 if (err)
1230 goto out;
1231
1232 sock = sock_alloc();
1233 if (!sock) {
1234 err = -ENOMEM;
1235 goto out;
1236 }
1237
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001239 err = security_socket_post_create(sock, family, type, protocol, 1);
1240 if (err)
1241 goto out_release;
1242
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243out:
1244 *res = sock;
1245 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001246out_release:
1247 sock_release(sock);
1248 sock = NULL;
1249 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001251EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252
1253/* No kernel lock held - perfect */
Al Viroade994f2017-07-03 00:01:49 -04001254static __poll_t sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255{
Christoph Hellwig3cafb372018-01-09 16:07:34 +01001256 struct socket *sock = file->private_data;
Christoph Hellwiga331de32018-07-30 09:42:13 +02001257 __poll_t events = poll_requested_events(wait), flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258
Christoph Hellwige88958e2018-06-29 15:37:24 +02001259 if (!sock->ops->poll)
1260 return 0;
Christoph Hellwigf641f13b2018-07-30 09:42:12 +02001261
Christoph Hellwiga331de32018-07-30 09:42:13 +02001262 if (sk_can_busy_loop(sock->sk)) {
1263 /* poll once if requested by the syscall */
1264 if (events & POLL_BUSY_LOOP)
1265 sk_busy_loop(sock->sk, 1);
1266
1267 /* if this socket can poll_ll, tell the system call */
1268 flag = POLL_BUSY_LOOP;
1269 }
1270
1271 return sock->ops->poll(file, sock, wait) | flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272}
1273
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001274static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001276 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277
1278 return sock->ops->mmap(file, sock, vma);
1279}
1280
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001281static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282{
Cong Wang6d8c50d2018-06-07 13:39:49 -07001283 __sock_release(SOCKET_I(inode), inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 return 0;
1285}
1286
1287/*
1288 * Update the socket async list
1289 *
1290 * Fasync_list locking strategy.
1291 *
1292 * 1. fasync_list is modified only under process context socket lock
1293 * i.e. under semaphore.
1294 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001295 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 */
1297
1298static int sock_fasync(int fd, struct file *filp, int on)
1299{
Eric Dumazet989a2972010-04-14 09:55:35 +00001300 struct socket *sock = filp->private_data;
1301 struct sock *sk = sock->sk;
Al Viro333f7902019-07-05 20:14:16 +01001302 struct socket_wq *wq = &sock->wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303
Eric Dumazet989a2972010-04-14 09:55:35 +00001304 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306
1307 lock_sock(sk);
Eric Dumazeteaefd112011-02-18 03:26:36 +00001308 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309
Eric Dumazeteaefd112011-02-18 03:26:36 +00001310 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001311 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001312 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001313 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314
Eric Dumazet989a2972010-04-14 09:55:35 +00001315 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 return 0;
1317}
1318
Eric Dumazetceb5d582015-11-29 20:03:11 -08001319/* This function may be called only under rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320
Eric Dumazetceb5d582015-11-29 20:03:11 -08001321int sock_wake_async(struct socket_wq *wq, int how, int band)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322{
Eric Dumazetceb5d582015-11-29 20:03:11 -08001323 if (!wq || !wq->fasync_list)
1324 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001325
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001326 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001327 case SOCK_WAKE_WAITD:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001328 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 break;
1330 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001331 case SOCK_WAKE_SPACE:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001332 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 break;
Miaohe Lin7c7ab582020-08-08 16:23:10 +08001334 fallthrough;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001335 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001336call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001337 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001339 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001340 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08001342
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 return 0;
1344}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001345EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001347/**
1348 * __sock_create - creates a socket
1349 * @net: net namespace
1350 * @family: protocol family (AF_INET, ...)
1351 * @type: communication type (SOCK_STREAM, ...)
1352 * @protocol: protocol (0, ...)
1353 * @res: new socket
1354 * @kern: boolean for kernel space sockets
1355 *
1356 * Creates a new socket and assigns it to @res, passing through LSM.
1357 * Returns 0 or an error. On failure @res is set to %NULL. @kern must
1358 * be set to true if the socket resides in kernel space.
1359 * This function internally uses GFP_KERNEL.
1360 */
1361
Pavel Emelyanov721db932010-09-29 16:06:32 +04001362int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001363 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364{
1365 int err;
1366 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001367 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368
1369 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001370 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 */
1372 if (family < 0 || family >= NPROTO)
1373 return -EAFNOSUPPORT;
1374 if (type < 0 || type >= SOCK_MAX)
1375 return -EINVAL;
1376
1377 /* Compatibility.
1378
1379 This uglymoron is moved from INET layer to here to avoid
1380 deadlock in module load.
1381 */
1382 if (family == PF_INET && type == SOCK_PACKET) {
liping.zhangf3c98692016-03-11 23:08:36 +08001383 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1384 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 family = PF_PACKET;
1386 }
1387
1388 err = security_socket_create(family, type, protocol, kern);
1389 if (err)
1390 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001391
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001392 /*
1393 * Allocate the socket and allow the family to set things up. if
1394 * the protocol is 0, the family is instructed to select an appropriate
1395 * default.
1396 */
1397 sock = sock_alloc();
1398 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001399 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001400 return -ENFILE; /* Not exactly a match, but its the
1401 closest posix thing */
1402 }
1403
1404 sock->type = type;
1405
Johannes Berg95a5afc2008-10-16 15:24:51 -07001406#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001407 /* Attempt to load a protocol module if the find failed.
1408 *
1409 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 * requested real, full-featured networking support upon configuration.
1411 * Otherwise module support will break!
1412 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001413 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001414 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415#endif
1416
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001417 rcu_read_lock();
1418 pf = rcu_dereference(net_families[family]);
1419 err = -EAFNOSUPPORT;
1420 if (!pf)
1421 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422
1423 /*
1424 * We will call the ->create function, that possibly is in a loadable
1425 * module, so we have to bump that loadable module refcnt first.
1426 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001427 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 goto out_release;
1429
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001430 /* Now protected by module ref count */
1431 rcu_read_unlock();
1432
Eric Paris3f378b62009-11-05 22:18:14 -08001433 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001434 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001436
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 /*
1438 * Now to bump the refcnt of the [loadable] module that owns this
1439 * socket at sock_release time we decrement its refcnt.
1440 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001441 if (!try_module_get(sock->ops->owner))
1442 goto out_module_busy;
1443
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 /*
1445 * Now that we're done with the ->create function, the [loadable]
1446 * module can have its refcnt decremented
1447 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001448 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001449 err = security_socket_post_create(sock, family, type, protocol, kern);
1450 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001451 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001452 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001454 return 0;
1455
1456out_module_busy:
1457 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001459 sock->ops = NULL;
1460 module_put(pf->owner);
1461out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001463 return err;
1464
1465out_release:
1466 rcu_read_unlock();
1467 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001469EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001471/**
1472 * sock_create - creates a socket
1473 * @family: protocol family (AF_INET, ...)
1474 * @type: communication type (SOCK_STREAM, ...)
1475 * @protocol: protocol (0, ...)
1476 * @res: new socket
1477 *
1478 * A wrapper around __sock_create().
1479 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1480 */
1481
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482int sock_create(int family, int type, int protocol, struct socket **res)
1483{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001484 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001486EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001488/**
1489 * sock_create_kern - creates a socket (kernel space)
1490 * @net: net namespace
1491 * @family: protocol family (AF_INET, ...)
1492 * @type: communication type (SOCK_STREAM, ...)
1493 * @protocol: protocol (0, ...)
1494 * @res: new socket
1495 *
1496 * A wrapper around __sock_create().
1497 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1498 */
1499
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001500int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501{
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001502 return __sock_create(net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001504EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001506int __sys_socket(int family, int type, int protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507{
1508 int retval;
1509 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001510 int flags;
1511
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001512 /* Check the SOCK_* constants for consistency. */
1513 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1514 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1515 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1516 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1517
Ulrich Dreppera677a032008-07-23 21:29:17 -07001518 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001519 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001520 return -EINVAL;
1521 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001523 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1524 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1525
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 retval = sock_create(family, type, protocol, &sock);
1527 if (retval < 0)
Al Viro8e1611e2017-12-05 23:29:09 +00001528 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529
Al Viro8e1611e2017-12-05 23:29:09 +00001530 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531}
1532
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001533SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1534{
1535 return __sys_socket(family, type, protocol);
1536}
1537
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538/*
1539 * Create a pair of connected sockets.
1540 */
1541
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001542int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543{
1544 struct socket *sock1, *sock2;
1545 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001546 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001547 int flags;
1548
1549 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001550 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001551 return -EINVAL;
1552 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001554 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1555 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1556
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557 /*
Al Viro016a2662017-12-05 23:28:38 +00001558 * reserve descriptors and make sure we won't fail
1559 * to return them to userland.
1560 */
1561 fd1 = get_unused_fd_flags(flags);
1562 if (unlikely(fd1 < 0))
1563 return fd1;
1564
1565 fd2 = get_unused_fd_flags(flags);
1566 if (unlikely(fd2 < 0)) {
1567 put_unused_fd(fd1);
1568 return fd2;
1569 }
1570
1571 err = put_user(fd1, &usockvec[0]);
1572 if (err)
1573 goto out;
1574
1575 err = put_user(fd2, &usockvec[1]);
1576 if (err)
1577 goto out;
1578
1579 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 * Obtain the first socket and check if the underlying protocol
1581 * supports the socketpair call.
1582 */
1583
1584 err = sock_create(family, type, protocol, &sock1);
Al Viro016a2662017-12-05 23:28:38 +00001585 if (unlikely(err < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 goto out;
1587
1588 err = sock_create(family, type, protocol, &sock2);
Al Viro016a2662017-12-05 23:28:38 +00001589 if (unlikely(err < 0)) {
1590 sock_release(sock1);
1591 goto out;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001592 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001593
David Herrmannd47cd942018-05-04 16:28:20 +02001594 err = security_socket_socketpair(sock1, sock2);
1595 if (unlikely(err)) {
1596 sock_release(sock2);
1597 sock_release(sock1);
1598 goto out;
1599 }
1600
Al Viro016a2662017-12-05 23:28:38 +00001601 err = sock1->ops->socketpair(sock1, sock2);
1602 if (unlikely(err < 0)) {
1603 sock_release(sock2);
1604 sock_release(sock1);
1605 goto out;
Al Viro28407632012-08-17 23:54:15 -04001606 }
1607
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001608 newfile1 = sock_alloc_file(sock1, flags, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301609 if (IS_ERR(newfile1)) {
Al Viro28407632012-08-17 23:54:15 -04001610 err = PTR_ERR(newfile1);
Al Viro016a2662017-12-05 23:28:38 +00001611 sock_release(sock2);
1612 goto out;
Al Viro28407632012-08-17 23:54:15 -04001613 }
1614
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001615 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001616 if (IS_ERR(newfile2)) {
1617 err = PTR_ERR(newfile2);
Al Viro016a2662017-12-05 23:28:38 +00001618 fput(newfile1);
1619 goto out;
Al Virodb349502007-02-07 01:48:00 -05001620 }
1621
Al Viro157cf642008-12-14 04:57:47 -05001622 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001623
Al Virodb349502007-02-07 01:48:00 -05001624 fd_install(fd1, newfile1);
1625 fd_install(fd2, newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001626 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628out:
Al Viro016a2662017-12-05 23:28:38 +00001629 put_unused_fd(fd2);
1630 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631 return err;
1632}
1633
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001634SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1635 int __user *, usockvec)
1636{
1637 return __sys_socketpair(family, type, protocol, usockvec);
1638}
1639
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640/*
1641 * Bind a name to a socket. Nothing much to do here since it's
1642 * the protocol's responsibility to handle the local address.
1643 *
1644 * We move the socket address to kernel space before we call
1645 * the protocol layer (having also checked the address is ok).
1646 */
1647
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001648int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649{
1650 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001651 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001652 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001654 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001655 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001656 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Jakub Sitnicki068b88c2018-10-04 11:09:40 +02001657 if (!err) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001658 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001659 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001660 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001661 if (!err)
1662 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001663 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001664 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001666 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001667 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668 return err;
1669}
1670
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001671SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1672{
1673 return __sys_bind(fd, umyaddr, addrlen);
1674}
1675
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676/*
1677 * Perform a listen. Basically, we allow the protocol to do anything
1678 * necessary for a listen, and if that works, we mark the socket as
1679 * ready for listening.
1680 */
1681
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001682int __sys_listen(int fd, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683{
1684 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001685 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001686 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001687
1688 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1689 if (sock) {
Kuniyuki Iwashima23cf93b2022-08-23 10:47:00 -07001690 somaxconn = READ_ONCE(sock_net(sock->sk)->core.sysctl_somaxconn);
Eric Dumazet95c96172012-04-15 05:58:06 +00001691 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001692 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693
1694 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001695 if (!err)
1696 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001698 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 }
1700 return err;
1701}
1702
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001703SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1704{
1705 return __sys_listen(fd, backlog);
1706}
1707
Pavel Begunkovad0b0132021-08-25 12:25:44 +01001708struct file *do_accept(struct file *file, unsigned file_flags,
Jens Axboede2ea4b2019-10-17 14:41:29 -06001709 struct sockaddr __user *upeer_sockaddr,
Pavel Begunkovad0b0132021-08-25 12:25:44 +01001710 int __user *upeer_addrlen, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711{
1712 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001713 struct file *newfile;
Pavel Begunkovad0b0132021-08-25 12:25:44 +01001714 int err, len;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001715 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716
Jens Axboede2ea4b2019-10-17 14:41:29 -06001717 sock = sock_from_file(file, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718 if (!sock)
Pavel Begunkovad0b0132021-08-25 12:25:44 +01001719 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001721 newsock = sock_alloc();
1722 if (!newsock)
Pavel Begunkovad0b0132021-08-25 12:25:44 +01001723 return ERR_PTR(-ENFILE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724
1725 newsock->type = sock->type;
1726 newsock->ops = sock->ops;
1727
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728 /*
1729 * We don't need try_module_get here, as the listening socket (sock)
1730 * has the protocol module (sock->ops->owner) held.
1731 */
1732 __module_get(newsock->ops->owner);
1733
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001734 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Pavel Begunkovad0b0132021-08-25 12:25:44 +01001735 if (IS_ERR(newfile))
1736 return newfile;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001737
Frank Filza79af592005-09-27 15:23:38 -07001738 err = security_socket_accept(sock, newsock);
1739 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001740 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001741
Jens Axboede2ea4b2019-10-17 14:41:29 -06001742 err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags,
1743 false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001745 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746
1747 if (upeer_sockaddr) {
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001748 len = newsock->ops->getname(newsock,
1749 (struct sockaddr *)&address, 2);
1750 if (len < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001752 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001754 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001755 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001757 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758 }
1759
1760 /* File flags are not inherited via accept() unlike another OSes. */
Pavel Begunkovad0b0132021-08-25 12:25:44 +01001761 return newfile;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001762out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001763 fput(newfile);
Pavel Begunkovad0b0132021-08-25 12:25:44 +01001764 return ERR_PTR(err);
1765}
Jens Axboede2ea4b2019-10-17 14:41:29 -06001766
Pavel Begunkovad0b0132021-08-25 12:25:44 +01001767int __sys_accept4_file(struct file *file, unsigned file_flags,
1768 struct sockaddr __user *upeer_sockaddr,
1769 int __user *upeer_addrlen, int flags,
1770 unsigned long nofile)
1771{
1772 struct file *newfile;
1773 int newfd;
1774
1775 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1776 return -EINVAL;
1777
1778 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1779 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1780
1781 newfd = __get_unused_fd_flags(flags, nofile);
1782 if (unlikely(newfd < 0))
1783 return newfd;
1784
1785 newfile = do_accept(file, file_flags, upeer_sockaddr, upeer_addrlen,
1786 flags);
1787 if (IS_ERR(newfile)) {
1788 put_unused_fd(newfd);
1789 return PTR_ERR(newfile);
1790 }
1791 fd_install(newfd, newfile);
1792 return newfd;
Jens Axboede2ea4b2019-10-17 14:41:29 -06001793}
1794
1795/*
1796 * For accept, we attempt to create a new socket, set up the link
1797 * with the client, wake up the client, then return the new
1798 * connected fd. We collect the address of the connector in kernel
1799 * space and move it to user at the very end. This is unclean because
1800 * we open the socket then return an error.
1801 *
1802 * 1003.1g adds the ability to recvmsg() to query connection pending
1803 * status to recvmsg. We need to add that support in a way thats
1804 * clean when we restructure accept also.
1805 */
1806
1807int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
1808 int __user *upeer_addrlen, int flags)
1809{
1810 int ret = -EBADF;
1811 struct fd f;
1812
1813 f = fdget(fd);
1814 if (f.file) {
1815 ret = __sys_accept4_file(f.file, 0, upeer_sockaddr,
Jens Axboe09952e32020-03-19 20:16:56 -06001816 upeer_addrlen, flags,
1817 rlimit(RLIMIT_NOFILE));
Miaohe Lin6b07ede2020-08-06 19:52:24 +08001818 fdput(f);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001819 }
1820
1821 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822}
1823
Dominik Brodowski4541e802018-03-13 19:24:23 +01001824SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1825 int __user *, upeer_addrlen, int, flags)
1826{
1827 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
1828}
1829
Heiko Carstens20f37032009-01-14 14:14:23 +01001830SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1831 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001832{
Dominik Brodowski4541e802018-03-13 19:24:23 +01001833 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001834}
1835
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836/*
1837 * Attempt to connect to a socket with the server address. The address
1838 * is in user space so we verify it is OK and move it to kernel space.
1839 *
1840 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1841 * break bindings
1842 *
1843 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1844 * other SEQPACKET protocols that take time to connect() as it doesn't
1845 * include the -EINPROGRESS status for such sockets.
1846 */
1847
Jens Axboef499a022019-12-02 16:28:46 -07001848int __sys_connect_file(struct file *file, struct sockaddr_storage *address,
Jens Axboebd3ded32019-11-23 14:17:16 -07001849 int addrlen, int file_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850{
1851 struct socket *sock;
Jens Axboebd3ded32019-11-23 14:17:16 -07001852 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853
Jens Axboebd3ded32019-11-23 14:17:16 -07001854 sock = sock_from_file(file, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855 if (!sock)
1856 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001858 err =
Jens Axboef499a022019-12-02 16:28:46 -07001859 security_socket_connect(sock, (struct sockaddr *)address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 if (err)
Jens Axboebd3ded32019-11-23 14:17:16 -07001861 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862
Jens Axboef499a022019-12-02 16:28:46 -07001863 err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,
Jens Axboebd3ded32019-11-23 14:17:16 -07001864 sock->file->f_flags | file_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865out:
1866 return err;
1867}
1868
Jens Axboebd3ded32019-11-23 14:17:16 -07001869int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
1870{
1871 int ret = -EBADF;
1872 struct fd f;
1873
1874 f = fdget(fd);
1875 if (f.file) {
Jens Axboef499a022019-12-02 16:28:46 -07001876 struct sockaddr_storage address;
1877
1878 ret = move_addr_to_kernel(uservaddr, addrlen, &address);
1879 if (!ret)
1880 ret = __sys_connect_file(f.file, &address, addrlen, 0);
Miaohe Lin6b07ede2020-08-06 19:52:24 +08001881 fdput(f);
Jens Axboebd3ded32019-11-23 14:17:16 -07001882 }
1883
1884 return ret;
1885}
1886
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01001887SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1888 int, addrlen)
1889{
1890 return __sys_connect(fd, uservaddr, addrlen);
1891}
1892
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893/*
1894 * Get the local address ('name') of a socket object. Move the obtained
1895 * name to user space.
1896 */
1897
Dominik Brodowski8882a102018-03-13 19:43:14 +01001898int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1899 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001900{
1901 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001902 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001903 int err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001904
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001905 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 if (!sock)
1907 goto out;
1908
1909 err = security_socket_getsockname(sock);
1910 if (err)
1911 goto out_put;
1912
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001913 err = sock->ops->getname(sock, (struct sockaddr *)&address, 0);
1914 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 goto out_put;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001916 /* "err" is actually length in this case */
1917 err = move_addr_to_user(&address, err, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918
1919out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001920 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921out:
1922 return err;
1923}
1924
Dominik Brodowski8882a102018-03-13 19:43:14 +01001925SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1926 int __user *, usockaddr_len)
1927{
1928 return __sys_getsockname(fd, usockaddr, usockaddr_len);
1929}
1930
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931/*
1932 * Get the remote address ('name') of a socket object. Move the obtained
1933 * name to user space.
1934 */
1935
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001936int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1937 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938{
1939 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001940 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001941 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001943 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1944 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945 err = security_socket_getpeername(sock);
1946 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001947 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948 return err;
1949 }
1950
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001951 err = sock->ops->getname(sock, (struct sockaddr *)&address, 1);
1952 if (err >= 0)
1953 /* "err" is actually length in this case */
1954 err = move_addr_to_user(&address, err, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001955 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001956 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957 }
1958 return err;
1959}
1960
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001961SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1962 int __user *, usockaddr_len)
1963{
1964 return __sys_getpeername(fd, usockaddr, usockaddr_len);
1965}
1966
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967/*
1968 * Send a datagram to a given address. We move the address into kernel
1969 * space and check the user space data area is readable before invoking
1970 * the protocol.
1971 */
Dominik Brodowski211b6342018-03-13 19:18:52 +01001972int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
1973 struct sockaddr __user *addr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974{
1975 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001976 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977 int err;
1978 struct msghdr msg;
1979 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001980 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001981
Al Viro602bd0e2015-03-21 19:12:32 -04001982 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
1983 if (unlikely(err))
1984 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08001985 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1986 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08001987 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001988
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001989 msg.msg_name = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001990 msg.msg_control = NULL;
1991 msg.msg_controllen = 0;
1992 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001993 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001994 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995 if (err < 0)
1996 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001997 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001998 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999 }
2000 if (sock->file->f_flags & O_NONBLOCK)
2001 flags |= MSG_DONTWAIT;
2002 msg.msg_flags = flags;
Jordan Rife81d03e22023-09-21 18:46:41 -05002003 err = __sock_sendmsg(sock, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002005out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002006 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08002007out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008 return err;
2009}
2010
Dominik Brodowski211b6342018-03-13 19:18:52 +01002011SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
2012 unsigned int, flags, struct sockaddr __user *, addr,
2013 int, addr_len)
2014{
2015 return __sys_sendto(fd, buff, len, flags, addr, addr_len);
2016}
2017
Linus Torvalds1da177e2005-04-16 15:20:36 -07002018/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002019 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020 */
2021
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002022SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00002023 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002024{
Dominik Brodowski211b6342018-03-13 19:18:52 +01002025 return __sys_sendto(fd, buff, len, flags, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026}
2027
2028/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002029 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030 * sender. We verify the buffers are writable and if needed move the
2031 * sender address from kernel to user space.
2032 */
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002033int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
2034 struct sockaddr __user *addr, int __user *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002035{
2036 struct socket *sock;
2037 struct iovec iov;
2038 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002039 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002040 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002041 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042
Al Viro602bd0e2015-03-21 19:12:32 -04002043 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
2044 if (unlikely(err))
2045 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002046 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002047 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002048 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002050 msg.msg_control = NULL;
2051 msg.msg_controllen = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002052 /* Save some cycles and don't copy the address if not needed */
2053 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
2054 /* We assume all kernel code knows the size of sockaddr_storage */
2055 msg.msg_namelen = 0;
tadeusz.struk@intel.com130ed5d2015-12-15 10:46:17 -08002056 msg.msg_iocb = NULL;
Alexander Potapenko9f138fa2017-03-08 18:08:16 +01002057 msg.msg_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002058 if (sock->file->f_flags & O_NONBLOCK)
2059 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002060 err = sock_recvmsg(sock, &msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002062 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002063 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002064 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002065 if (err2 < 0)
2066 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002068
2069 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08002070out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071 return err;
2072}
2073
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002074SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
2075 unsigned int, flags, struct sockaddr __user *, addr,
2076 int __user *, addr_len)
2077{
2078 return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len);
2079}
2080
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002082 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083 */
2084
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02002085SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
2086 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087{
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002088 return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089}
2090
Florian Westphal83f0c102020-07-05 01:30:15 +02002091static bool sock_use_custom_sol_socket(const struct socket *sock)
2092{
2093 const struct sock *sk = sock->sk;
2094
2095 /* Use sock->ops->setsockopt() for MPTCP */
2096 return IS_ENABLED(CONFIG_MPTCP) &&
2097 sk->sk_protocol == IPPROTO_MPTCP &&
2098 sk->sk_type == SOCK_STREAM &&
2099 (sk->sk_family == AF_INET || sk->sk_family == AF_INET6);
2100}
2101
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102/*
2103 * Set a socket option. Because we don't know the option lengths we have
2104 * to pass the user mode parameter for the protocols to sort out.
2105 */
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002106int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval,
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002107 int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108{
Christoph Hellwig519a8a62020-08-10 18:42:14 +02002109 sockptr_t optval = USER_SOCKPTR(user_optval);
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002110 char *kernel_optval = NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002111 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002112 struct socket *sock;
2113
2114 if (optlen < 0)
2115 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002116
2117 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002118 if (!sock)
2119 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002120
Christoph Hellwig4a367292020-07-17 08:23:11 +02002121 err = security_socket_setsockopt(sock, level, optname);
2122 if (err)
2123 goto out_put;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002124
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002125 if (!in_compat_syscall())
2126 err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname,
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002127 user_optval, &optlen,
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002128 &kernel_optval);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002129 if (err < 0)
2130 goto out_put;
2131 if (err > 0) {
2132 err = 0;
2133 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134 }
Christoph Hellwig4a367292020-07-17 08:23:11 +02002135
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002136 if (kernel_optval)
2137 optval = KERNEL_SOCKPTR(kernel_optval);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002138 if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock))
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002139 err = sock_setsockopt(sock, level, optname, optval, optlen);
Christoph Hellwiga44d9e72020-07-17 08:23:31 +02002140 else if (unlikely(!sock->ops->setsockopt))
2141 err = -EOPNOTSUPP;
Christoph Hellwig4a367292020-07-17 08:23:11 +02002142 else
2143 err = sock->ops->setsockopt(sock, level, optname, optval,
2144 optlen);
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002145 kfree(kernel_optval);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002146out_put:
2147 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002148 return err;
2149}
2150
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002151SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
2152 char __user *, optval, int, optlen)
2153{
2154 return __sys_setsockopt(fd, level, optname, optval, optlen);
2155}
2156
Stanislav Fomichev08f61a32021-01-15 08:34:59 -08002157INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level,
2158 int optname));
2159
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160/*
2161 * Get a socket option. Because we don't know the option lengths we have
2162 * to pass a user mode parameter for the protocols to sort out.
2163 */
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002164int __sys_getsockopt(int fd, int level, int optname, char __user *optval,
2165 int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002167 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002168 struct socket *sock;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002169 int max_optlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002170
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002171 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002172 if (!sock)
2173 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002174
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002175 err = security_socket_getsockopt(sock, level, optname);
2176 if (err)
2177 goto out_put;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002178
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002179 if (!in_compat_syscall())
2180 max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen);
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002181
2182 if (level == SOL_SOCKET)
2183 err = sock_getsockopt(sock, level, optname, optval, optlen);
Christoph Hellwiga44d9e72020-07-17 08:23:31 +02002184 else if (unlikely(!sock->ops->getsockopt))
2185 err = -EOPNOTSUPP;
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002186 else
2187 err = sock->ops->getsockopt(sock, level, optname, optval,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002188 optlen);
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002189
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002190 if (!in_compat_syscall())
2191 err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname,
2192 optval, optlen, max_optlen,
2193 err);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002194out_put:
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002195 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196 return err;
2197}
2198
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002199SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
2200 char __user *, optval, int __user *, optlen)
2201{
2202 return __sys_getsockopt(fd, level, optname, optval, optlen);
2203}
2204
Linus Torvalds1da177e2005-04-16 15:20:36 -07002205/*
2206 * Shutdown a socket.
2207 */
2208
Jens Axboe069ac282020-09-05 11:13:35 -06002209int __sys_shutdown_sock(struct socket *sock, int how)
2210{
2211 int err;
2212
2213 err = security_socket_shutdown(sock, how);
2214 if (!err)
2215 err = sock->ops->shutdown(sock, how);
2216
2217 return err;
2218}
2219
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002220int __sys_shutdown(int fd, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002222 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002223 struct socket *sock;
2224
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002225 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2226 if (sock != NULL) {
Jens Axboe069ac282020-09-05 11:13:35 -06002227 err = __sys_shutdown_sock(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002228 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229 }
2230 return err;
2231}
2232
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002233SYSCALL_DEFINE2(shutdown, int, fd, int, how)
2234{
2235 return __sys_shutdown(fd, how);
2236}
2237
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002238/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07002239 * fields which are the same type (int / unsigned) on our platforms.
2240 */
2241#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
2242#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
2243#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
2244
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002245struct used_address {
2246 struct sockaddr_storage name;
2247 unsigned int name_len;
2248};
2249
Jens Axboe0a384ab2020-02-27 08:11:20 -07002250int __copy_msghdr_from_user(struct msghdr *kmsg,
2251 struct user_msghdr __user *umsg,
2252 struct sockaddr __user **save_addr,
2253 struct iovec __user **uiov, size_t *nsegs)
Dan Carpenter1661bf32013-10-03 00:27:20 +03002254{
Al Viroffb07552017-06-27 19:32:04 -04002255 struct user_msghdr msg;
Al Viro08adb7d2014-11-10 20:23:13 -05002256 ssize_t err;
2257
Al Viroffb07552017-06-27 19:32:04 -04002258 if (copy_from_user(&msg, umsg, sizeof(*umsg)))
Dan Carpenter1661bf32013-10-03 00:27:20 +03002259 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00002260
Christoph Hellwig1f466e12020-05-11 13:59:13 +02002261 kmsg->msg_control_is_user = true;
2262 kmsg->msg_control_user = msg.msg_control;
Al Viroffb07552017-06-27 19:32:04 -04002263 kmsg->msg_controllen = msg.msg_controllen;
2264 kmsg->msg_flags = msg.msg_flags;
2265
2266 kmsg->msg_namelen = msg.msg_namelen;
2267 if (!msg.msg_name)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07002268 kmsg->msg_namelen = 0;
2269
Matthew Leachdbb490b2014-03-11 11:58:27 +00002270 if (kmsg->msg_namelen < 0)
2271 return -EINVAL;
2272
Dan Carpenter1661bf32013-10-03 00:27:20 +03002273 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03002274 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05002275
2276 if (save_addr)
Al Viroffb07552017-06-27 19:32:04 -04002277 *save_addr = msg.msg_name;
Al Viro08adb7d2014-11-10 20:23:13 -05002278
Al Viroffb07552017-06-27 19:32:04 -04002279 if (msg.msg_name && kmsg->msg_namelen) {
Al Viro08adb7d2014-11-10 20:23:13 -05002280 if (!save_addr) {
Paolo Abeni864d9662017-07-21 18:49:45 +02002281 err = move_addr_to_kernel(msg.msg_name,
2282 kmsg->msg_namelen,
Al Viro08adb7d2014-11-10 20:23:13 -05002283 kmsg->msg_name);
2284 if (err < 0)
2285 return err;
2286 }
2287 } else {
2288 kmsg->msg_name = NULL;
2289 kmsg->msg_namelen = 0;
2290 }
2291
Al Viroffb07552017-06-27 19:32:04 -04002292 if (msg.msg_iovlen > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05002293 return -EMSGSIZE;
2294
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002295 kmsg->msg_iocb = NULL;
Jens Axboe0a384ab2020-02-27 08:11:20 -07002296 *uiov = msg.msg_iov;
2297 *nsegs = msg.msg_iovlen;
2298 return 0;
2299}
2300
2301static int copy_msghdr_from_user(struct msghdr *kmsg,
2302 struct user_msghdr __user *umsg,
2303 struct sockaddr __user **save_addr,
2304 struct iovec **iov)
2305{
2306 struct user_msghdr msg;
2307 ssize_t err;
2308
2309 err = __copy_msghdr_from_user(kmsg, umsg, save_addr, &msg.msg_iov,
2310 &msg.msg_iovlen);
2311 if (err)
2312 return err;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002313
Jens Axboe87e5e6d2019-05-14 16:02:22 -06002314 err = import_iovec(save_addr ? READ : WRITE,
Al Viroffb07552017-06-27 19:32:04 -04002315 msg.msg_iov, msg.msg_iovlen,
Al Viroda184282015-03-21 19:29:06 -04002316 UIO_FASTIOV, iov, &kmsg->msg_iter);
Jens Axboe87e5e6d2019-05-14 16:02:22 -06002317 return err < 0 ? err : 0;
Dan Carpenter1661bf32013-10-03 00:27:20 +03002318}
2319
Jens Axboe4257c8c2019-11-25 14:27:34 -07002320static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys,
2321 unsigned int flags, struct used_address *used_address,
2322 unsigned int allowed_msghdr_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002323{
Alex Williamsonb9d717a2005-09-26 14:28:02 -07002324 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Amit Kushwaha846cc122016-12-08 18:21:53 +05302325 __aligned(sizeof(__kernel_size_t));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002326 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002327 unsigned char *ctl_buf = ctl;
Al Virod8725c82014-12-11 00:02:50 -05002328 int ctl_len;
Al Viro08adb7d2014-11-10 20:23:13 -05002329 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002330
Linus Torvalds1da177e2005-04-16 15:20:36 -07002331 err = -ENOBUFS;
2332
Anton Blanchard228e5482011-05-02 20:21:35 +00002333 if (msg_sys->msg_controllen > INT_MAX)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002334 goto out;
Tom Herbert28a94d82016-03-07 14:11:02 -08002335 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
Anton Blanchard228e5482011-05-02 20:21:35 +00002336 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002337 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002338 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00002339 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002340 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002341 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002342 goto out;
Anton Blanchard228e5482011-05-02 20:21:35 +00002343 ctl_buf = msg_sys->msg_control;
2344 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002345 } else if (ctl_len) {
David S. Millerac4340f2017-01-04 13:24:19 -05002346 BUILD_BUG_ON(sizeof(struct cmsghdr) !=
2347 CMSG_ALIGN(sizeof(struct cmsghdr)));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002348 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002349 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002350 if (ctl_buf == NULL)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002351 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352 }
2353 err = -EFAULT;
Christoph Hellwig1f466e12020-05-11 13:59:13 +02002354 if (copy_from_user(ctl_buf, msg_sys->msg_control_user, ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00002356 msg_sys->msg_control = ctl_buf;
Christoph Hellwig1f466e12020-05-11 13:59:13 +02002357 msg_sys->msg_control_is_user = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002358 }
Anton Blanchard228e5482011-05-02 20:21:35 +00002359 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360
2361 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00002362 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002363 /*
2364 * If this is sendmmsg() and current destination address is same as
2365 * previously succeeded address, omit asking LSM's decision.
2366 * used_address->name_len is initialized to UINT_MAX so that the first
2367 * destination address never matches.
2368 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002369 if (used_address && msg_sys->msg_name &&
2370 used_address->name_len == msg_sys->msg_namelen &&
2371 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002372 used_address->name_len)) {
Al Virod8725c82014-12-11 00:02:50 -05002373 err = sock_sendmsg_nosec(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002374 goto out_freectl;
2375 }
Jordan Rife81d03e22023-09-21 18:46:41 -05002376 err = __sock_sendmsg(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002377 /*
2378 * If this is sendmmsg() and sending to current destination address was
2379 * successful, remember it.
2380 */
2381 if (used_address && err >= 0) {
2382 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002383 if (msg_sys->msg_name)
2384 memcpy(&used_address->name, msg_sys->msg_name,
2385 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002386 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002387
2388out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002389 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002390 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
Jens Axboe4257c8c2019-11-25 14:27:34 -07002391out:
2392 return err;
2393}
2394
Jens Axboe03b12302019-12-02 18:50:25 -07002395int sendmsg_copy_msghdr(struct msghdr *msg,
2396 struct user_msghdr __user *umsg, unsigned flags,
2397 struct iovec **iov)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002398{
2399 int err;
2400
2401 if (flags & MSG_CMSG_COMPAT) {
2402 struct compat_msghdr __user *msg_compat;
2403
2404 msg_compat = (struct compat_msghdr __user *) umsg;
2405 err = get_compat_msghdr(msg, msg_compat, NULL, iov);
2406 } else {
2407 err = copy_msghdr_from_user(msg, umsg, NULL, iov);
2408 }
2409 if (err < 0)
2410 return err;
2411
2412 return 0;
2413}
2414
2415static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
2416 struct msghdr *msg_sys, unsigned int flags,
2417 struct used_address *used_address,
2418 unsigned int allowed_msghdr_flags)
2419{
2420 struct sockaddr_storage address;
2421 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2422 ssize_t err;
2423
2424 msg_sys->msg_name = &address;
2425
2426 err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov);
2427 if (err < 0)
2428 return err;
2429
2430 err = ____sys_sendmsg(sock, msg_sys, flags, used_address,
2431 allowed_msghdr_flags);
Al Viroda184282015-03-21 19:29:06 -04002432 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00002433 return err;
2434}
2435
2436/*
2437 * BSD sendmsg interface
2438 */
Jens Axboe03b12302019-12-02 18:50:25 -07002439long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,
Jens Axboe0fa03c62019-04-19 13:34:07 -06002440 unsigned int flags)
2441{
Jens Axboe03b12302019-12-02 18:50:25 -07002442 return ____sys_sendmsg(sock, msg, flags, NULL, 0);
Jens Axboe0fa03c62019-04-19 13:34:07 -06002443}
Anton Blanchard228e5482011-05-02 20:21:35 +00002444
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002445long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2446 bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002447{
2448 int fput_needed, err;
2449 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002450 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00002451
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002452 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2453 return -EINVAL;
2454
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002455 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00002456 if (!sock)
2457 goto out;
2458
Tom Herbert28a94d82016-03-07 14:11:02 -08002459 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
Anton Blanchard228e5482011-05-02 20:21:35 +00002460
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002461 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002462out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002463 return err;
2464}
2465
Al Viro666547f2014-04-06 14:03:05 -04002466SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002467{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002468 return __sys_sendmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002469}
2470
Anton Blanchard228e5482011-05-02 20:21:35 +00002471/*
2472 * Linux sendmmsg interface
2473 */
2474
2475int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002476 unsigned int flags, bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002477{
2478 int fput_needed, err, datagrams;
2479 struct socket *sock;
2480 struct mmsghdr __user *entry;
2481 struct compat_mmsghdr __user *compat_entry;
2482 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002483 struct used_address used_address;
Tom Herbertf0922762016-03-07 14:11:03 -08002484 unsigned int oflags = flags;
Anton Blanchard228e5482011-05-02 20:21:35 +00002485
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002486 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2487 return -EINVAL;
2488
Anton Blanchard98382f42011-08-04 14:07:39 +00002489 if (vlen > UIO_MAXIOV)
2490 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002491
2492 datagrams = 0;
2493
2494 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2495 if (!sock)
2496 return err;
2497
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002498 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002499 entry = mmsg;
2500 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002501 err = 0;
Tom Herbertf0922762016-03-07 14:11:03 -08002502 flags |= MSG_BATCH;
Anton Blanchard228e5482011-05-02 20:21:35 +00002503
2504 while (datagrams < vlen) {
Tom Herbertf0922762016-03-07 14:11:03 -08002505 if (datagrams == vlen - 1)
2506 flags = oflags;
2507
Anton Blanchard228e5482011-05-02 20:21:35 +00002508 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002509 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002510 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002511 if (err < 0)
2512 break;
2513 err = __put_user(err, &compat_entry->msg_len);
2514 ++compat_entry;
2515 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002516 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002517 (struct user_msghdr __user *)entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002518 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002519 if (err < 0)
2520 break;
2521 err = put_user(err, &entry->msg_len);
2522 ++entry;
2523 }
2524
2525 if (err)
2526 break;
2527 ++datagrams;
Soheil Hassas Yeganeh30238982016-11-04 15:36:49 -04002528 if (msg_data_left(&msg_sys))
2529 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002530 cond_resched();
Anton Blanchard228e5482011-05-02 20:21:35 +00002531 }
2532
Anton Blanchard228e5482011-05-02 20:21:35 +00002533 fput_light(sock->file, fput_needed);
2534
Anton Blanchard728ffb82011-08-04 14:07:38 +00002535 /* We only return an error if no datagrams were able to be sent */
2536 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002537 return datagrams;
2538
Anton Blanchard228e5482011-05-02 20:21:35 +00002539 return err;
2540}
2541
2542SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2543 unsigned int, vlen, unsigned int, flags)
2544{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002545 return __sys_sendmmsg(fd, mmsg, vlen, flags, true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002546}
2547
Jens Axboe03b12302019-12-02 18:50:25 -07002548int recvmsg_copy_msghdr(struct msghdr *msg,
2549 struct user_msghdr __user *umsg, unsigned flags,
2550 struct sockaddr __user **uaddr,
2551 struct iovec **iov)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002552{
2553 ssize_t err;
2554
2555 if (MSG_CMSG_COMPAT & flags) {
2556 struct compat_msghdr __user *msg_compat;
2557
2558 msg_compat = (struct compat_msghdr __user *) umsg;
2559 err = get_compat_msghdr(msg, msg_compat, uaddr, iov);
2560 } else {
2561 err = copy_msghdr_from_user(msg, umsg, uaddr, iov);
2562 }
2563 if (err < 0)
2564 return err;
2565
2566 return 0;
2567}
2568
2569static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys,
2570 struct user_msghdr __user *msg,
2571 struct sockaddr __user *uaddr,
2572 unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002574 struct compat_msghdr __user *msg_compat =
Jens Axboe4257c8c2019-11-25 14:27:34 -07002575 (struct compat_msghdr __user *) msg;
2576 int __user *uaddr_len = COMPAT_NAMELEN(msg);
2577 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002578 unsigned long cmsg_ptr;
Al Viro2da62902015-03-14 21:13:46 -04002579 int len;
Al Viro08adb7d2014-11-10 20:23:13 -05002580 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002581
Al Viro08adb7d2014-11-10 20:23:13 -05002582 msg_sys->msg_name = &addr;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002583 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2584 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002585
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002586 /* We assume all kernel code knows the size of sockaddr_storage */
2587 msg_sys->msg_namelen = 0;
2588
Linus Torvalds1da177e2005-04-16 15:20:36 -07002589 if (sock->file->f_flags & O_NONBLOCK)
2590 flags |= MSG_DONTWAIT;
Eric Dumazet1af66222019-12-06 09:38:36 -08002591
2592 if (unlikely(nosec))
2593 err = sock_recvmsg_nosec(sock, msg_sys, flags);
2594 else
2595 err = sock_recvmsg(sock, msg_sys, flags);
2596
Linus Torvalds1da177e2005-04-16 15:20:36 -07002597 if (err < 0)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002598 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002599 len = err;
2600
2601 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002602 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002603 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002604 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002605 if (err < 0)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002606 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002607 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002608 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f4212005-09-16 16:51:01 -07002609 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002610 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002611 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002612 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002613 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002614 &msg_compat->msg_controllen);
2615 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002616 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002617 &msg->msg_controllen);
2618 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002619 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002620 err = len;
Jens Axboe4257c8c2019-11-25 14:27:34 -07002621out:
2622 return err;
2623}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002624
Jens Axboe4257c8c2019-11-25 14:27:34 -07002625static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
2626 struct msghdr *msg_sys, unsigned int flags, int nosec)
2627{
2628 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2629 /* user mode address pointers */
2630 struct sockaddr __user *uaddr;
2631 ssize_t err;
2632
2633 err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov);
2634 if (err < 0)
2635 return err;
2636
2637 err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec);
Al Viroda184282015-03-21 19:29:06 -04002638 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002639 return err;
2640}
2641
2642/*
2643 * BSD recvmsg interface
2644 */
2645
Jens Axboe03b12302019-12-02 18:50:25 -07002646long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg,
2647 struct user_msghdr __user *umsg,
2648 struct sockaddr __user *uaddr, unsigned int flags)
Jens Axboeaa1fa282019-04-19 13:38:09 -06002649{
Jens Axboe03b12302019-12-02 18:50:25 -07002650 return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0);
Jens Axboeaa1fa282019-04-19 13:38:09 -06002651}
2652
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002653long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2654 bool forbid_cmsg_compat)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002655{
2656 int fput_needed, err;
2657 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002658 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002659
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002660 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2661 return -EINVAL;
2662
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002663 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002664 if (!sock)
2665 goto out;
2666
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002667 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002668
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002669 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002670out:
2671 return err;
2672}
2673
Al Viro666547f2014-04-06 14:03:05 -04002674SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002675 unsigned int, flags)
2676{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002677 return __sys_recvmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002678}
2679
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002680/*
2681 * Linux recvmmsg interface
2682 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002684static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2685 unsigned int vlen, unsigned int flags,
2686 struct timespec64 *timeout)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002687{
2688 int fput_needed, err, datagrams;
2689 struct socket *sock;
2690 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002691 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002692 struct msghdr msg_sys;
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002693 struct timespec64 end_time;
2694 struct timespec64 timeout64;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002695
2696 if (timeout &&
2697 poll_select_set_timeout(&end_time, timeout->tv_sec,
2698 timeout->tv_nsec))
2699 return -EINVAL;
2700
2701 datagrams = 0;
2702
2703 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2704 if (!sock)
2705 return err;
2706
Soheil Hassas Yeganeh7797dc42018-02-27 18:22:40 -05002707 if (likely(!(flags & MSG_ERRQUEUE))) {
2708 err = sock_error(sock->sk);
2709 if (err) {
2710 datagrams = err;
2711 goto out_put;
2712 }
Maxime Jayate623a9e2017-02-21 18:35:51 +01002713 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002714
2715 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002716 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002717
2718 while (datagrams < vlen) {
2719 /*
2720 * No need to ask LSM for more than the first datagram.
2721 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002722 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002723 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002724 &msg_sys, flags & ~MSG_WAITFORONE,
2725 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002726 if (err < 0)
2727 break;
2728 err = __put_user(err, &compat_entry->msg_len);
2729 ++compat_entry;
2730 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002731 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002732 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002733 &msg_sys, flags & ~MSG_WAITFORONE,
2734 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002735 if (err < 0)
2736 break;
2737 err = put_user(err, &entry->msg_len);
2738 ++entry;
2739 }
2740
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002741 if (err)
2742 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002743 ++datagrams;
2744
Brandon L Black71c5c1592010-03-26 16:18:03 +00002745 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2746 if (flags & MSG_WAITFORONE)
2747 flags |= MSG_DONTWAIT;
2748
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002749 if (timeout) {
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002750 ktime_get_ts64(&timeout64);
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002751 *timeout = timespec64_sub(end_time, timeout64);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002752 if (timeout->tv_sec < 0) {
2753 timeout->tv_sec = timeout->tv_nsec = 0;
2754 break;
2755 }
2756
2757 /* Timeout, return less than vlen datagrams */
2758 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2759 break;
2760 }
2761
2762 /* Out of band data, return right away */
2763 if (msg_sys.msg_flags & MSG_OOB)
2764 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002765 cond_resched();
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002766 }
2767
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002768 if (err == 0)
2769 goto out_put;
2770
2771 if (datagrams == 0) {
2772 datagrams = err;
2773 goto out_put;
2774 }
2775
2776 /*
2777 * We may return less entries than requested (vlen) if the
2778 * sock is non block and there aren't enough datagrams...
2779 */
2780 if (err != -EAGAIN) {
2781 /*
2782 * ... or if recvmsg returns an error after we
2783 * received some datagrams, where we record the
2784 * error to return on the next call or if the
2785 * app asks about it using getsockopt(SO_ERROR).
2786 */
Eric Dumazet1b33bdd72023-05-09 16:35:53 +00002787 WRITE_ONCE(sock->sk->sk_err, -err);
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002788 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002789out_put:
2790 fput_light(sock->file, fput_needed);
2791
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002792 return datagrams;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002793}
2794
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002795int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2796 unsigned int vlen, unsigned int flags,
2797 struct __kernel_timespec __user *timeout,
2798 struct old_timespec32 __user *timeout32)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002799{
2800 int datagrams;
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002801 struct timespec64 timeout_sys;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002802
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002803 if (timeout && get_timespec64(&timeout_sys, timeout))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002804 return -EFAULT;
2805
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002806 if (timeout32 && get_old_timespec32(&timeout_sys, timeout32))
2807 return -EFAULT;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002808
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002809 if (!timeout && !timeout32)
2810 return do_recvmmsg(fd, mmsg, vlen, flags, NULL);
2811
2812 datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2813
2814 if (datagrams <= 0)
2815 return datagrams;
2816
2817 if (timeout && put_timespec64(&timeout_sys, timeout))
2818 datagrams = -EFAULT;
2819
2820 if (timeout32 && put_old_timespec32(&timeout_sys, timeout32))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002821 datagrams = -EFAULT;
2822
2823 return datagrams;
2824}
2825
Dominik Brodowski1255e262018-03-13 20:44:21 +01002826SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2827 unsigned int, vlen, unsigned int, flags,
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002828 struct __kernel_timespec __user *, timeout)
Dominik Brodowski1255e262018-03-13 20:44:21 +01002829{
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002830 if (flags & MSG_CMSG_COMPAT)
2831 return -EINVAL;
2832
2833 return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL);
Dominik Brodowski1255e262018-03-13 20:44:21 +01002834}
2835
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002836#ifdef CONFIG_COMPAT_32BIT_TIME
2837SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg,
2838 unsigned int, vlen, unsigned int, flags,
2839 struct old_timespec32 __user *, timeout)
2840{
2841 if (flags & MSG_CMSG_COMPAT)
2842 return -EINVAL;
2843
2844 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout);
2845}
2846#endif
2847
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002848#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002849/* Argument list sizes for sys_socketcall */
2850#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002851static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002852 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2853 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2854 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002855 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002856};
2857
Linus Torvalds1da177e2005-04-16 15:20:36 -07002858#undef AL
2859
2860/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002861 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002862 *
2863 * Argument checking cleaned up. Saved 20% in size.
2864 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002865 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002866 */
2867
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002868SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002869{
Chen Gang2950fa92013-04-07 16:55:23 +08002870 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002871 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002872 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002873 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002874
Anton Blanchard228e5482011-05-02 20:21:35 +00002875 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002876 return -EINVAL;
Jeremy Clinec8e8cd52018-07-27 22:43:01 +00002877 call = array_index_nospec(call, SYS_SENDMMSG + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002878
Arjan van de Ven47379052009-09-28 12:57:44 -07002879 len = nargs[call];
2880 if (len > sizeof(a))
2881 return -EINVAL;
2882
Linus Torvalds1da177e2005-04-16 15:20:36 -07002883 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002884 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002885 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002886
Chen Gang2950fa92013-04-07 16:55:23 +08002887 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2888 if (err)
2889 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002890
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002891 a0 = a[0];
2892 a1 = a[1];
2893
2894 switch (call) {
2895 case SYS_SOCKET:
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01002896 err = __sys_socket(a0, a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002897 break;
2898 case SYS_BIND:
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01002899 err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002900 break;
2901 case SYS_CONNECT:
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01002902 err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002903 break;
2904 case SYS_LISTEN:
Dominik Brodowski25e290e2018-03-13 19:36:54 +01002905 err = __sys_listen(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002906 break;
2907 case SYS_ACCEPT:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002908 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2909 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002910 break;
2911 case SYS_GETSOCKNAME:
2912 err =
Dominik Brodowski8882a102018-03-13 19:43:14 +01002913 __sys_getsockname(a0, (struct sockaddr __user *)a1,
2914 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002915 break;
2916 case SYS_GETPEERNAME:
2917 err =
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01002918 __sys_getpeername(a0, (struct sockaddr __user *)a1,
2919 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002920 break;
2921 case SYS_SOCKETPAIR:
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01002922 err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002923 break;
2924 case SYS_SEND:
Dominik Brodowskif3bf8962018-03-13 19:52:00 +01002925 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2926 NULL, 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002927 break;
2928 case SYS_SENDTO:
Dominik Brodowski211b6342018-03-13 19:18:52 +01002929 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2930 (struct sockaddr __user *)a[4], a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002931 break;
2932 case SYS_RECV:
Dominik Brodowskid27e9af2018-03-13 19:54:17 +01002933 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2934 NULL, NULL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002935 break;
2936 case SYS_RECVFROM:
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002937 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2938 (struct sockaddr __user *)a[4],
2939 (int __user *)a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002940 break;
2941 case SYS_SHUTDOWN:
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002942 err = __sys_shutdown(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002943 break;
2944 case SYS_SETSOCKOPT:
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002945 err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3],
2946 a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002947 break;
2948 case SYS_GETSOCKOPT:
2949 err =
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002950 __sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2951 (int __user *)a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002952 break;
2953 case SYS_SENDMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002954 err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1,
2955 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002956 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002957 case SYS_SENDMMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002958 err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2],
2959 a[3], true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002960 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002961 case SYS_RECVMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002962 err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1,
2963 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002964 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002965 case SYS_RECVMMSG:
Arnd Bergmann3ca47e92019-04-23 17:43:50 +02002966 if (IS_ENABLED(CONFIG_64BIT))
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002967 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
2968 a[2], a[3],
2969 (struct __kernel_timespec __user *)a[4],
2970 NULL);
2971 else
2972 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
2973 a[2], a[3], NULL,
2974 (struct old_timespec32 __user *)a[4]);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002975 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08002976 case SYS_ACCEPT4:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002977 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2978 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07002979 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002980 default:
2981 err = -EINVAL;
2982 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002983 }
2984 return err;
2985}
2986
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002987#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002988
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002989/**
2990 * sock_register - add a socket protocol handler
2991 * @ops: description of protocol
2992 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993 * This function is called by a protocol handler that wants to
2994 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09002995 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07002996 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002997 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07002998int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002999{
3000 int err;
3001
3002 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08003003 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003004 return -ENOBUFS;
3005 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003006
3007 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00003008 if (rcu_dereference_protected(net_families[ops->family],
3009 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003010 err = -EEXIST;
3011 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00003012 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003013 err = 0;
3014 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003015 spin_unlock(&net_family_lock);
3016
Yang Yingliang3410f222014-02-12 17:09:55 +08003017 pr_info("NET: Registered protocol family %d\n", ops->family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018 return err;
3019}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003020EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003021
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003022/**
3023 * sock_unregister - remove a protocol handler
3024 * @family: protocol family to remove
3025 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003026 * This function is called by a protocol handler that wants to
3027 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003028 * new socket creation.
3029 *
3030 * If protocol handler is a module, then it can use module reference
3031 * counts to protect against new references. If protocol handler is not
3032 * a module then it needs to provide its own protection in
3033 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003034 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07003035void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003036{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07003037 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003038
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003039 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00003040 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003041 spin_unlock(&net_family_lock);
3042
3043 synchronize_rcu();
3044
Yang Yingliang3410f222014-02-12 17:09:55 +08003045 pr_info("NET: Unregistered protocol family %d\n", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003046}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003047EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003048
Xin Longbf2ae2e2018-03-10 18:57:50 +08003049bool sock_is_registered(int family)
3050{
Jeremy Cline66b51b02018-08-13 22:23:13 +00003051 return family < NPROTO && rcu_access_pointer(net_families[family]);
Xin Longbf2ae2e2018-03-10 18:57:50 +08003052}
3053
Andi Kleen77d76ea2005-12-22 12:43:42 -08003054static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003055{
Nick Pigginb3e19d92011-01-07 17:50:11 +11003056 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00003057 /*
3058 * Initialize the network sysctl infrastructure.
3059 */
3060 err = net_sysctl_init();
3061 if (err)
3062 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11003063
Linus Torvalds1da177e2005-04-16 15:20:36 -07003064 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003065 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07003066 */
3067 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003068
3069 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003070 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003071 */
3072
3073 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11003074
3075 err = register_filesystem(&sock_fs_type);
3076 if (err)
Miaohe Lin47260ba2020-08-06 19:54:19 +08003077 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003078 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11003079 if (IS_ERR(sock_mnt)) {
3080 err = PTR_ERR(sock_mnt);
3081 goto out_mount;
3082 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08003083
3084 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085 */
3086
3087#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00003088 err = netfilter_init();
3089 if (err)
3090 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003091#endif
David S. Millercbeb3212005-12-22 12:58:55 -08003092
Daniel Borkmann408eccc2014-04-01 16:20:23 +02003093 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00003094
Nick Pigginb3e19d92011-01-07 17:50:11 +11003095out:
3096 return err;
3097
3098out_mount:
3099 unregister_filesystem(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11003100 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003101}
3102
Andi Kleen77d76ea2005-12-22 12:43:42 -08003103core_initcall(sock_init); /* early initcall */
3104
Linus Torvalds1da177e2005-04-16 15:20:36 -07003105#ifdef CONFIG_PROC_FS
3106void socket_seq_show(struct seq_file *seq)
3107{
Tonghao Zhang648845a2017-12-14 05:51:58 -08003108 seq_printf(seq, "sockets: used %d\n",
3109 sock_inuse_get(seq->private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003110}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003111#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003112
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003113#ifdef CONFIG_COMPAT
Al Viro36fd6332017-06-26 13:19:16 -04003114static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003115{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003116 struct compat_ifconf ifc32;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003117 struct ifconf ifc;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003118 int err;
3119
Arnd Bergmann6b960182009-11-06 23:10:54 -08003120 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003121 return -EFAULT;
3122
Al Viro36fd6332017-06-26 13:19:16 -04003123 ifc.ifc_len = ifc32.ifc_len;
3124 ifc.ifc_req = compat_ptr(ifc32.ifcbuf);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003125
Al Viro36fd6332017-06-26 13:19:16 -04003126 rtnl_lock();
3127 err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq));
3128 rtnl_unlock();
Arnd Bergmann7a229382009-11-06 23:00:29 -08003129 if (err)
3130 return err;
3131
Al Viro36fd6332017-06-26 13:19:16 -04003132 ifc32.ifc_len = ifc.ifc_len;
Arnd Bergmann6b960182009-11-06 23:10:54 -08003133 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003134 return -EFAULT;
3135
3136 return 0;
3137}
3138
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003139static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
3140{
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003141 compat_uptr_t uptr32;
Al Viro44c02a22017-10-05 12:59:44 -04003142 struct ifreq ifr;
3143 void __user *saved;
3144 int err;
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003145
Al Viro44c02a22017-10-05 12:59:44 -04003146 if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq)))
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003147 return -EFAULT;
3148
3149 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
3150 return -EFAULT;
3151
Al Viro44c02a22017-10-05 12:59:44 -04003152 saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc;
3153 ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003154
Al Viro44c02a22017-10-05 12:59:44 -04003155 err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL);
3156 if (!err) {
3157 ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved;
3158 if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq)))
3159 err = -EFAULT;
Joe Perchesccbd6a52010-05-14 10:58:26 +00003160 }
Al Viro44c02a22017-10-05 12:59:44 -04003161 return err;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003162}
3163
Ben Hutchings590d4692013-11-18 17:04:13 +00003164/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3165static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08003166 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003167{
Al Viro44c02a22017-10-05 12:59:44 -04003168 struct ifreq ifreq;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003169 u32 data32;
3170
Peter Collingbourne1890ee72021-08-26 12:46:01 -07003171 if (!is_socket_ioctl_cmd(cmd))
3172 return -ENOTTY;
Al Viro44c02a22017-10-05 12:59:44 -04003173 if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003174 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04003175 if (get_user(data32, &u_ifreq32->ifr_data))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003176 return -EFAULT;
Al Viro44c02a22017-10-05 12:59:44 -04003177 ifreq.ifr_data = compat_ptr(data32);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003178
Al Viro44c02a22017-10-05 12:59:44 -04003179 return dev_ioctl(net, cmd, &ifreq, NULL);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003180}
3181
Johannes Berg37ac39b2019-01-25 22:43:18 +01003182static int compat_ifreq_ioctl(struct net *net, struct socket *sock,
3183 unsigned int cmd,
3184 struct compat_ifreq __user *uifr32)
3185{
3186 struct ifreq __user *uifr;
3187 int err;
3188
3189 /* Handle the fact that while struct ifreq has the same *layout* on
3190 * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
3191 * which are handled elsewhere, it still has different *size* due to
3192 * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
3193 * resulting in struct ifreq being 32 and 40 bytes respectively).
3194 * As a result, if the struct happens to be at the end of a page and
3195 * the next page isn't readable/writable, we get a fault. To prevent
3196 * that, copy back and forth to the full size.
3197 */
3198
3199 uifr = compat_alloc_user_space(sizeof(*uifr));
3200 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
3201 return -EFAULT;
3202
3203 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
3204
3205 if (!err) {
3206 switch (cmd) {
3207 case SIOCGIFFLAGS:
3208 case SIOCGIFMETRIC:
3209 case SIOCGIFMTU:
3210 case SIOCGIFMEM:
3211 case SIOCGIFHWADDR:
3212 case SIOCGIFINDEX:
3213 case SIOCGIFADDR:
3214 case SIOCGIFBRDADDR:
3215 case SIOCGIFDSTADDR:
3216 case SIOCGIFNETMASK:
3217 case SIOCGIFPFLAGS:
3218 case SIOCGIFTXQLEN:
3219 case SIOCGMIIPHY:
3220 case SIOCGMIIREG:
Johannes Bergc6c9fee2019-01-25 22:43:19 +01003221 case SIOCGIFNAME:
Johannes Berg37ac39b2019-01-25 22:43:18 +01003222 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
3223 err = -EFAULT;
3224 break;
3225 }
3226 }
3227 return err;
3228}
3229
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003230static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
3231 struct compat_ifreq __user *uifr32)
3232{
3233 struct ifreq ifr;
3234 struct compat_ifmap __user *uifmap32;
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003235 int err;
3236
3237 uifmap32 = &uifr32->ifr_ifru.ifru_map;
3238 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003239 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3240 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3241 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3242 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
3243 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
3244 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003245 if (err)
3246 return -EFAULT;
3247
Al Viro44c02a22017-10-05 12:59:44 -04003248 err = dev_ioctl(net, cmd, &ifr, NULL);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003249
3250 if (cmd == SIOCGIFMAP && !err) {
3251 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
Mathieu Desnoyers3ddc5b42013-09-11 14:23:18 -07003252 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3253 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3254 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3255 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
3256 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
3257 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003258 if (err)
3259 err = -EFAULT;
3260 }
3261 return err;
3262}
3263
Arnd Bergmann7a229382009-11-06 23:00:29 -08003264/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3265 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003266 * use compatible ioctls
Arnd Bergmann7a229382009-11-06 23:00:29 -08003267 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003268static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003269{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003270 compat_ulong_t tmp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003271
Arnd Bergmann6b960182009-11-06 23:10:54 -08003272 if (get_user(tmp, argp))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003273 return -EFAULT;
3274 if (tmp == BRCTL_GET_VERSION)
3275 return BRCTL_VERSION + 1;
3276 return -EINVAL;
3277}
3278
Arnd Bergmann6b960182009-11-06 23:10:54 -08003279static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3280 unsigned int cmd, unsigned long arg)
3281{
3282 void __user *argp = compat_ptr(arg);
3283 struct sock *sk = sock->sk;
3284 struct net *net = sock_net(sk);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003285
Arnd Bergmann6b960182009-11-06 23:10:54 -08003286 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Ben Hutchings590d4692013-11-18 17:04:13 +00003287 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003288
Arnd Bergmann6b960182009-11-06 23:10:54 -08003289 switch (cmd) {
3290 case SIOCSIFBR:
3291 case SIOCGIFBR:
3292 return old_bridge_ioctl(argp);
Arnd Bergmann6b960182009-11-06 23:10:54 -08003293 case SIOCGIFCONF:
Al Viro36fd6332017-06-26 13:19:16 -04003294 return compat_dev_ifconf(net, argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003295 case SIOCWANDEV:
3296 return compat_siocwandev(net, argp);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003297 case SIOCGIFMAP:
3298 case SIOCSIFMAP:
3299 return compat_sioc_ifmap(net, cmd, argp);
Arnd Bergmann0768e172019-04-17 22:56:11 +02003300 case SIOCGSTAMP_OLD:
3301 case SIOCGSTAMPNS_OLD:
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02003302 if (!sock->ops->gettstamp)
3303 return -ENOIOCTLCMD;
Arnd Bergmann0768e172019-04-17 22:56:11 +02003304 return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD,
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02003305 !COMPAT_USE_64BIT_TIME);
3306
Arnd Bergmann5b3a45e2021-07-22 16:28:59 +02003307 case SIOCETHTOOL:
Ben Hutchings590d4692013-11-18 17:04:13 +00003308 case SIOCBONDSLAVEINFOQUERY:
3309 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003310 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003311 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003312 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003313
Arnd Bergmann6b960182009-11-06 23:10:54 -08003314 case FIOSETOWN:
3315 case SIOCSPGRP:
3316 case FIOGETOWN:
3317 case SIOCGPGRP:
3318 case SIOCBRADDBR:
3319 case SIOCBRDELBR:
3320 case SIOCGIFVLAN:
3321 case SIOCSIFVLAN:
3322 case SIOCADDDLCI:
3323 case SIOCDELDLCI:
Andrey Vaginc62cce22016-10-24 18:29:13 -07003324 case SIOCGSKNS:
Arnd Bergmann0768e172019-04-17 22:56:11 +02003325 case SIOCGSTAMP_NEW:
3326 case SIOCGSTAMPNS_NEW:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003327 return sock_ioctl(file, cmd, arg);
3328
3329 case SIOCGIFFLAGS:
3330 case SIOCSIFFLAGS:
3331 case SIOCGIFMETRIC:
3332 case SIOCSIFMETRIC:
3333 case SIOCGIFMTU:
3334 case SIOCSIFMTU:
3335 case SIOCGIFMEM:
3336 case SIOCSIFMEM:
3337 case SIOCGIFHWADDR:
3338 case SIOCSIFHWADDR:
3339 case SIOCADDMULTI:
3340 case SIOCDELMULTI:
3341 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003342 case SIOCGIFADDR:
3343 case SIOCSIFADDR:
3344 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003345 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003346 case SIOCGIFBRDADDR:
3347 case SIOCSIFBRDADDR:
3348 case SIOCGIFDSTADDR:
3349 case SIOCSIFDSTADDR:
3350 case SIOCGIFNETMASK:
3351 case SIOCSIFNETMASK:
3352 case SIOCSIFPFLAGS:
3353 case SIOCGIFPFLAGS:
3354 case SIOCGIFTXQLEN:
3355 case SIOCSIFTXQLEN:
3356 case SIOCBRADDIF:
3357 case SIOCBRDELIF:
Johannes Bergc6c9fee2019-01-25 22:43:19 +01003358 case SIOCGIFNAME:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003359 case SIOCSIFNAME:
3360 case SIOCGMIIPHY:
3361 case SIOCGMIIREG:
3362 case SIOCSMIIREG:
Al Virof92d4fc2017-09-30 19:32:17 -04003363 case SIOCBONDENSLAVE:
3364 case SIOCBONDRELEASE:
3365 case SIOCBONDSETHWADDR:
3366 case SIOCBONDCHANGEACTIVE:
Johannes Berg37ac39b2019-01-25 22:43:18 +01003367 return compat_ifreq_ioctl(net, sock, cmd, argp);
3368
Arnd Bergmann6b960182009-11-06 23:10:54 -08003369 case SIOCSARP:
3370 case SIOCGARP:
3371 case SIOCDARP:
Arnd Bergmannc7dc5042019-06-03 23:07:12 +02003372 case SIOCOUTQ:
Arnd Bergmann9d7bf412019-06-03 23:06:00 +02003373 case SIOCOUTQNSD:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003374 case SIOCATMARK:
Johannes Berg63ff03a2019-01-25 22:43:17 +01003375 return sock_do_ioctl(net, sock, cmd, arg);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003376 }
3377
Arnd Bergmann6b960182009-11-06 23:10:54 -08003378 return -ENOIOCTLCMD;
3379}
Arnd Bergmann7a229382009-11-06 23:00:29 -08003380
Eric Dumazet95c96172012-04-15 05:58:06 +00003381static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003382 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003383{
3384 struct socket *sock = file->private_data;
3385 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003386 struct sock *sk;
3387 struct net *net;
3388
3389 sk = sock->sk;
3390 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003391
3392 if (sock->ops->compat_ioctl)
3393 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3394
David S. Miller87de87d2008-06-03 09:14:03 -07003395 if (ret == -ENOIOCTLCMD &&
3396 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3397 ret = compat_wext_handle_ioctl(net, cmd, arg);
3398
Arnd Bergmann6b960182009-11-06 23:10:54 -08003399 if (ret == -ENOIOCTLCMD)
3400 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3401
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003402 return ret;
3403}
3404#endif
3405
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003406/**
3407 * kernel_bind - bind an address to a socket (kernel space)
3408 * @sock: socket
3409 * @addr: address
3410 * @addrlen: length of address
3411 *
3412 * Returns 0 or an error.
3413 */
3414
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003415int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3416{
3417 return sock->ops->bind(sock, addr, addrlen);
3418}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003419EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003420
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003421/**
3422 * kernel_listen - move socket to listening state (kernel space)
3423 * @sock: socket
3424 * @backlog: pending connections queue size
3425 *
3426 * Returns 0 or an error.
3427 */
3428
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003429int kernel_listen(struct socket *sock, int backlog)
3430{
3431 return sock->ops->listen(sock, backlog);
3432}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003433EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003434
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003435/**
3436 * kernel_accept - accept a connection (kernel space)
3437 * @sock: listening socket
3438 * @newsock: new connected socket
3439 * @flags: flags
3440 *
3441 * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0.
3442 * If it fails, @newsock is guaranteed to be %NULL.
3443 * Returns 0 or an error.
3444 */
3445
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003446int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3447{
3448 struct sock *sk = sock->sk;
3449 int err;
3450
3451 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3452 newsock);
3453 if (err < 0)
3454 goto done;
3455
David Howellscdfbabf2017-03-09 08:09:05 +00003456 err = sock->ops->accept(sock, *newsock, flags, true);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003457 if (err < 0) {
3458 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003459 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003460 goto done;
3461 }
3462
3463 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003464 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003465
3466done:
3467 return err;
3468}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003469EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003470
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003471/**
3472 * kernel_connect - connect a socket (kernel space)
3473 * @sock: socket
3474 * @addr: address
3475 * @addrlen: address length
3476 * @flags: flags (O_NONBLOCK, ...)
3477 *
3478 * For datagram sockets, @addr is the addres to which datagrams are sent
3479 * by default, and the only address from which datagrams are received.
3480 * For stream sockets, attempts to connect to @addr.
3481 * Returns 0 or an error code.
3482 */
3483
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003484int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003485 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003486{
Jordan Rife42714d32023-08-21 16:45:23 -05003487 struct sockaddr_storage address;
3488
3489 memcpy(&address, addr, addrlen);
3490
3491 return sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, flags);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003492}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003493EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003494
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003495/**
3496 * kernel_getsockname - get the address which the socket is bound (kernel space)
3497 * @sock: socket
3498 * @addr: address holder
3499 *
3500 * Fills the @addr pointer with the address which the socket is bound.
3501 * Returns 0 or an error code.
3502 */
3503
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003504int kernel_getsockname(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003505{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003506 return sock->ops->getname(sock, addr, 0);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003507}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003508EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003509
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003510/**
Miaohe Lin645f0892020-08-27 07:27:49 -04003511 * kernel_getpeername - get the address which the socket is connected (kernel space)
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003512 * @sock: socket
3513 * @addr: address holder
3514 *
3515 * Fills the @addr pointer with the address which the socket is connected.
3516 * Returns 0 or an error code.
3517 */
3518
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003519int kernel_getpeername(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003520{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003521 return sock->ops->getname(sock, addr, 1);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003522}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003523EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003524
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003525/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003526 * kernel_sendpage - send a &page through a socket (kernel space)
3527 * @sock: socket
3528 * @page: page
3529 * @offset: page offset
3530 * @size: total size in bytes
3531 * @flags: flags (MSG_DONTWAIT, ...)
3532 *
3533 * Returns the total amount sent in bytes or an error.
3534 */
3535
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003536int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3537 size_t size, int flags)
3538{
Coly Li7b62d312020-10-02 16:27:29 +08003539 if (sock->ops->sendpage) {
3540 /* Warn in case the improper page to zero-copy send */
3541 WARN_ONCE(!sendpage_ok(page), "improper page for zero-copy send");
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003542 return sock->ops->sendpage(sock, page, offset, size, flags);
Coly Li7b62d312020-10-02 16:27:29 +08003543 }
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003544 return sock_no_sendpage(sock, page, offset, size, flags);
3545}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003546EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003547
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003548/**
3549 * kernel_sendpage_locked - send a &page through the locked sock (kernel space)
3550 * @sk: sock
3551 * @page: page
3552 * @offset: page offset
3553 * @size: total size in bytes
3554 * @flags: flags (MSG_DONTWAIT, ...)
3555 *
3556 * Returns the total amount sent in bytes or an error.
3557 * Caller must hold @sk.
3558 */
3559
Tom Herbert306b13e2017-07-28 16:22:41 -07003560int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
3561 size_t size, int flags)
3562{
3563 struct socket *sock = sk->sk_socket;
3564
3565 if (sock->ops->sendpage_locked)
3566 return sock->ops->sendpage_locked(sk, page, offset, size,
3567 flags);
3568
3569 return sock_no_sendpage_locked(sk, page, offset, size, flags);
3570}
3571EXPORT_SYMBOL(kernel_sendpage_locked);
3572
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003573/**
Miaohe Lin645f0892020-08-27 07:27:49 -04003574 * kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space)
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003575 * @sock: socket
3576 * @how: connection part
3577 *
3578 * Returns 0 or an error.
3579 */
3580
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003581int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3582{
3583 return sock->ops->shutdown(sock, how);
3584}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003585EXPORT_SYMBOL(kernel_sock_shutdown);
R. Parameswaran113c3072017-04-05 16:50:35 -07003586
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003587/**
3588 * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
3589 * @sk: socket
3590 *
3591 * This routine returns the IP overhead imposed by a socket i.e.
3592 * the length of the underlying IP header, depending on whether
3593 * this is an IPv4 or IPv6 socket and the length from IP options turned
3594 * on at the socket. Assumes that the caller has a lock on the socket.
R. Parameswaran113c3072017-04-05 16:50:35 -07003595 */
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003596
R. Parameswaran113c3072017-04-05 16:50:35 -07003597u32 kernel_sock_ip_overhead(struct sock *sk)
3598{
3599 struct inet_sock *inet;
3600 struct ip_options_rcu *opt;
3601 u32 overhead = 0;
R. Parameswaran113c3072017-04-05 16:50:35 -07003602#if IS_ENABLED(CONFIG_IPV6)
3603 struct ipv6_pinfo *np;
3604 struct ipv6_txoptions *optv6 = NULL;
3605#endif /* IS_ENABLED(CONFIG_IPV6) */
3606
3607 if (!sk)
3608 return overhead;
3609
R. Parameswaran113c3072017-04-05 16:50:35 -07003610 switch (sk->sk_family) {
3611 case AF_INET:
3612 inet = inet_sk(sk);
3613 overhead += sizeof(struct iphdr);
3614 opt = rcu_dereference_protected(inet->inet_opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003615 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003616 if (opt)
3617 overhead += opt->opt.optlen;
3618 return overhead;
3619#if IS_ENABLED(CONFIG_IPV6)
3620 case AF_INET6:
3621 np = inet6_sk(sk);
3622 overhead += sizeof(struct ipv6hdr);
3623 if (np)
3624 optv6 = rcu_dereference_protected(np->opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003625 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003626 if (optv6)
3627 overhead += (optv6->opt_flen + optv6->opt_nflen);
3628 return overhead;
3629#endif /* IS_ENABLED(CONFIG_IPV6) */
3630 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
3631 return overhead;
3632 }
3633}
3634EXPORT_SYMBOL(kernel_sock_ip_overhead);